--- /dev/null
+//
+// expression.cs: Expression representation for the IL tree.
+//
+// Author:
+// Miguel de Icaza (miguel@ximian.com)
+// Marek Safar (marek.safar@seznam.cz)
+//
+// (C) 2001, 2002, 2003 Ximian, Inc.
+// (C) 2003, 2004 Novell, Inc.
+//
+#define USE_OLD
+
+namespace Mono.CSharp {
+ using System;
+ using System.Collections;
+ using System.Reflection;
+ using System.Reflection.Emit;
+ using System.Text;
+
+ /// <summary>
+ /// This is just a helper class, it is generated by Unary, UnaryMutator
+ /// when an overloaded method has been found. It just emits the code for a
+ /// static call.
+ /// </summary>
+ public class StaticCallExpr : ExpressionStatement {
+ ArrayList args;
+ MethodInfo mi;
+
+ public StaticCallExpr (MethodInfo m, ArrayList a, Location l)
+ {
+ mi = m;
+ args = a;
+
+ type = m.ReturnType;
+ eclass = ExprClass.Value;
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // We are born fully resolved
+ //
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ if (args != null)
+ Invocation.EmitArguments (ec, mi, args, false, null);
+
+ ec.ig.Emit (OpCodes.Call, mi);
+ return;
+ }
+
+ static public StaticCallExpr MakeSimpleCall (EmitContext ec, MethodGroupExpr mg,
+ Expression e, Location loc)
+ {
+ ArrayList args;
+ MethodBase method;
+
+ args = new ArrayList (1);
+ Argument a = new Argument (e, Argument.AType.Expression);
+
+ // We need to resolve the arguments before sending them in !
+ if (!a.Resolve (ec, loc))
+ return null;
+
+ args.Add (a);
+ method = Invocation.OverloadResolve (
+ ec, (MethodGroupExpr) mg, args, false, loc);
+
+ if (method == null)
+ return null;
+
+ return new StaticCallExpr ((MethodInfo) method, args, loc);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ Emit (ec);
+ if (TypeManager.TypeToCoreType (type) != TypeManager.void_type)
+ ec.ig.Emit (OpCodes.Pop);
+ }
+
+ public MethodInfo Method {
+ get { return mi; }
+ }
+ }
+
+ public class ParenthesizedExpression : Expression
+ {
+ public Expression Expr;
+
+ public ParenthesizedExpression (Expression expr)
+ {
+ this.Expr = expr;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ Expr = Expr.Resolve (ec);
+ return Expr;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should not happen");
+ }
+
+ public override Location Location
+ {
+ get {
+ return Expr.Location;
+ }
+ }
+ }
+
+ /// <summary>
+ /// Unary expressions.
+ /// </summary>
+ ///
+ /// <remarks>
+ /// Unary implements unary expressions. It derives from
+ /// ExpressionStatement becuase the pre/post increment/decrement
+ /// operators can be used in a statement context.
+ /// </remarks>
+ public class Unary : Expression {
+ public enum Operator : byte {
+ UnaryPlus, UnaryNegation, LogicalNot, OnesComplement,
+ Indirection, AddressOf, TOP
+ }
+
+ public Operator Oper;
+ public Expression Expr;
+
+ public Unary (Operator op, Expression expr, Location loc)
+ {
+ this.Oper = op;
+ this.Expr = expr;
+ this.loc = loc;
+ }
+
+ /// <summary>
+ /// Returns a stringified representation of the Operator
+ /// </summary>
+ static public string OperName (Operator oper)
+ {
+ switch (oper){
+ case Operator.UnaryPlus:
+ return "+";
+ case Operator.UnaryNegation:
+ return "-";
+ case Operator.LogicalNot:
+ return "!";
+ case Operator.OnesComplement:
+ return "~";
+ case Operator.AddressOf:
+ return "&";
+ case Operator.Indirection:
+ return "*";
+ }
+
+ return oper.ToString ();
+ }
+
+ public static readonly string [] oper_names;
+
+ static Unary ()
+ {
+ oper_names = new string [(int)Operator.TOP];
+
+ oper_names [(int) Operator.UnaryPlus] = "op_UnaryPlus";
+ oper_names [(int) Operator.UnaryNegation] = "op_UnaryNegation";
+ oper_names [(int) Operator.LogicalNot] = "op_LogicalNot";
+ oper_names [(int) Operator.OnesComplement] = "op_OnesComplement";
+ oper_names [(int) Operator.Indirection] = "op_Indirection";
+ oper_names [(int) Operator.AddressOf] = "op_AddressOf";
+ }
+
+ public static void Error_OperatorCannotBeApplied (Location loc, string oper, Type t)
+ {
+ Error_OperatorCannotBeApplied (loc, oper, TypeManager.CSharpName (t));
+ }
+
+ public static void Error_OperatorCannotBeApplied (Location loc, string oper, string type)
+ {
+ Report.Error (23, loc, "The `{0}' operator cannot be applied to operand of type `{1}'",
+ oper, type);
+ }
+
+ void Error23 (Type t)
+ {
+ Error_OperatorCannotBeApplied (loc, OperName (Oper), t);
+ }
+
+ /// <remarks>
+ /// The result has been already resolved:
+ ///
+ /// FIXME: a minus constant -128 sbyte cant be turned into a
+ /// constant byte.
+ /// </remarks>
+ static Expression TryReduceNegative (Constant expr)
+ {
+ Expression e = null;
+
+ if (expr is IntConstant)
+ e = new IntConstant (-((IntConstant) expr).Value, expr.Location);
+ else if (expr is UIntConstant){
+ uint value = ((UIntConstant) expr).Value;
+
+ if (value < 2147483649)
+ return new IntConstant (-(int)value, expr.Location);
+ else
+ e = new LongConstant (-value, expr.Location);
+ }
+ else if (expr is LongConstant)
+ e = new LongConstant (-((LongConstant) expr).Value, expr.Location);
+ else if (expr is ULongConstant){
+ ulong value = ((ULongConstant) expr).Value;
+
+ if (value < 9223372036854775809)
+ return new LongConstant(-(long)value, expr.Location);
+ }
+ else if (expr is FloatConstant)
+ e = new FloatConstant (-((FloatConstant) expr).Value, expr.Location);
+ else if (expr is DoubleConstant)
+ e = new DoubleConstant (-((DoubleConstant) expr).Value, expr.Location);
+ else if (expr is DecimalConstant)
+ e = new DecimalConstant (-((DecimalConstant) expr).Value, expr.Location);
+ else if (expr is ShortConstant)
+ e = new IntConstant (-((ShortConstant) expr).Value, expr.Location);
+ else if (expr is UShortConstant)
+ e = new IntConstant (-((UShortConstant) expr).Value, expr.Location);
+ else if (expr is SByteConstant)
+ e = new IntConstant (-((SByteConstant) expr).Value, expr.Location);
+ else if (expr is ByteConstant)
+ e = new IntConstant (-((ByteConstant) expr).Value, expr.Location);
+ return e;
+ }
+
+ // <summary>
+ // This routine will attempt to simplify the unary expression when the
+ // argument is a constant. The result is returned in `result' and the
+ // function returns true or false depending on whether a reduction
+ // was performed or not
+ // </summary>
+ bool Reduce (EmitContext ec, Constant e, out Expression result)
+ {
+ Type expr_type = e.Type;
+
+ switch (Oper){
+ case Operator.UnaryPlus:
+ if (expr_type == TypeManager.bool_type){
+ result = null;
+ Error23 (expr_type);
+ return false;
+ }
+
+ result = e;
+ return true;
+
+ case Operator.UnaryNegation:
+ result = TryReduceNegative (e);
+ return result != null;
+
+ case Operator.LogicalNot:
+ if (expr_type != TypeManager.bool_type) {
+ result = null;
+ Error23 (expr_type);
+ return false;
+ }
+
+ BoolConstant b = (BoolConstant) e;
+ result = new BoolConstant (!(b.Value), b.Location);
+ return true;
+
+ case Operator.OnesComplement:
+ if (!((expr_type == TypeManager.int32_type) ||
+ (expr_type == TypeManager.uint32_type) ||
+ (expr_type == TypeManager.int64_type) ||
+ (expr_type == TypeManager.uint64_type) ||
+ (expr_type.IsSubclassOf (TypeManager.enum_type)))){
+
+ result = null;
+ if (Convert.ImplicitConversionExists (ec, e, TypeManager.int32_type)){
+ result = new Cast (new TypeExpression (TypeManager.int32_type, loc), e, loc);
+ result = result.Resolve (ec);
+ } else if (Convert.ImplicitConversionExists (ec, e, TypeManager.uint32_type)){
+ result = new Cast (new TypeExpression (TypeManager.uint32_type, loc), e, loc);
+ result = result.Resolve (ec);
+ } else if (Convert.ImplicitConversionExists (ec, e, TypeManager.int64_type)){
+ result = new Cast (new TypeExpression (TypeManager.int64_type, loc), e, loc);
+ result = result.Resolve (ec);
+ } else if (Convert.ImplicitConversionExists (ec, e, TypeManager.uint64_type)){
+ result = new Cast (new TypeExpression (TypeManager.uint64_type, loc), e, loc);
+ result = result.Resolve (ec);
+ }
+
+ if (result == null || !(result is Constant)){
+ result = null;
+ Error23 (expr_type);
+ return false;
+ }
+
+ expr_type = result.Type;
+ e = (Constant) result;
+ }
+
+ if (e is EnumConstant){
+ EnumConstant enum_constant = (EnumConstant) e;
+ Expression reduced;
+
+ if (Reduce (ec, enum_constant.Child, out reduced)){
+ result = new EnumConstant ((Constant) reduced, enum_constant.Type);
+ return true;
+ } else {
+ result = null;
+ return false;
+ }
+ }
+
+ if (expr_type == TypeManager.int32_type){
+ result = new IntConstant (~ ((IntConstant) e).Value, e.Location);
+ } else if (expr_type == TypeManager.uint32_type){
+ result = new UIntConstant (~ ((UIntConstant) e).Value, e.Location);
+ } else if (expr_type == TypeManager.int64_type){
+ result = new LongConstant (~ ((LongConstant) e).Value, e.Location);
+ } else if (expr_type == TypeManager.uint64_type){
+ result = new ULongConstant (~ ((ULongConstant) e).Value, e.Location);
+ } else {
+ result = null;
+ Error23 (expr_type);
+ return false;
+ }
+ return true;
+
+ case Operator.AddressOf:
+ result = this;
+ return false;
+
+ case Operator.Indirection:
+ result = this;
+ return false;
+ }
+ throw new Exception ("Can not constant fold: " + Oper.ToString());
+ }
+
+ Expression ResolveOperator (EmitContext ec)
+ {
+ //
+ // Step 1: Default operations on CLI native types.
+ //
+
+ // Attempt to use a constant folding operation.
+ if (Expr is Constant){
+ Expression result;
+
+ if (Reduce (ec, (Constant) Expr, out result))
+ return result;
+ }
+
+ //
+ // Step 2: Perform Operator Overload location
+ //
+ Type expr_type = Expr.Type;
+ Expression mg;
+ string op_name;
+
+ op_name = oper_names [(int) Oper];
+
+ mg = MemberLookup (ec.ContainerType, expr_type, op_name, MemberTypes.Method, AllBindingFlags, loc);
+
+ if (mg != null) {
+ Expression e = StaticCallExpr.MakeSimpleCall (
+ ec, (MethodGroupExpr) mg, Expr, loc);
+
+ if (e == null){
+ Error23 (expr_type);
+ return null;
+ }
+
+ return e;
+ }
+
+ // Only perform numeric promotions on:
+ // +, -
+
+ if (expr_type == null)
+ return null;
+
+ switch (Oper){
+ case Operator.LogicalNot:
+ if (expr_type != TypeManager.bool_type) {
+ Expr = ResolveBoolean (ec, Expr, loc);
+ if (Expr == null){
+ Error23 (expr_type);
+ return null;
+ }
+ }
+
+ type = TypeManager.bool_type;
+ return this;
+
+ case Operator.OnesComplement:
+ if (!((expr_type == TypeManager.int32_type) ||
+ (expr_type == TypeManager.uint32_type) ||
+ (expr_type == TypeManager.int64_type) ||
+ (expr_type == TypeManager.uint64_type) ||
+ (expr_type.IsSubclassOf (TypeManager.enum_type)))){
+ Expression e;
+
+ e = Convert.ImplicitConversion (ec, Expr, TypeManager.int32_type, loc);
+ if (e != null)
+ goto ok;
+ e = Convert.ImplicitConversion (ec, Expr, TypeManager.uint32_type, loc);
+ if (e != null)
+ goto ok;
+ e = Convert.ImplicitConversion (ec, Expr, TypeManager.int64_type, loc);
+ if (e != null)
+ goto ok;
+ e = Convert.ImplicitConversion (ec, Expr, TypeManager.uint64_type, loc);
+ if (e != null)
+ goto ok;
+ Error23 (expr_type);
+ return null;
+ ok:
+ Expr = e;
+ expr_type = e.Type;
+ }
+
+ type = expr_type;
+ return this;
+
+ case Operator.AddressOf:
+ if (!ec.InUnsafe) {
+ UnsafeError (loc);
+ return null;
+ }
+
+ if (!TypeManager.VerifyUnManaged (Expr.Type, loc)){
+ return null;
+ }
+
+ IVariable variable = Expr as IVariable;
+ bool is_fixed = variable != null && variable.VerifyFixed ();
+
+ if (!ec.InFixedInitializer && !is_fixed) {
+ Error (212, "You can only take the address of unfixed expression inside " +
+ "of a fixed statement initializer");
+ return null;
+ }
+
+ if (ec.InFixedInitializer && is_fixed) {
+ Error (213, "You cannot use the fixed statement to take the address of an already fixed expression");
+ return null;
+ }
+
+ LocalVariableReference lr = Expr as LocalVariableReference;
+ if (lr != null){
+ if (lr.local_info.IsCaptured){
+ AnonymousMethod.Error_AddressOfCapturedVar (lr.Name, loc);
+ return null;
+ }
+ lr.local_info.AddressTaken = true;
+ lr.local_info.Used = true;
+ }
+
+ ParameterReference pr = Expr as ParameterReference;
+ if ((pr != null) && pr.Parameter.IsCaptured) {
+ AnonymousMethod.Error_AddressOfCapturedVar (pr.Name, loc);
+ return null;
+ }
+
+ // According to the specs, a variable is considered definitely assigned if you take
+ // its address.
+ if ((variable != null) && (variable.VariableInfo != null)){
+ variable.VariableInfo.SetAssigned (ec);
+ }
+
+ type = TypeManager.GetPointerType (Expr.Type);
+ return this;
+
+ case Operator.Indirection:
+ if (!ec.InUnsafe){
+ UnsafeError (loc);
+ return null;
+ }
+
+ if (!expr_type.IsPointer){
+ Error (193, "The * or -> operator must be applied to a pointer");
+ return null;
+ }
+
+ //
+ // We create an Indirection expression, because
+ // it can implement the IMemoryLocation.
+ //
+ return new Indirection (Expr, loc);
+
+ case Operator.UnaryPlus:
+ //
+ // A plus in front of something is just a no-op, so return the child.
+ //
+ return Expr;
+
+ case Operator.UnaryNegation:
+ //
+ // Deals with -literals
+ // int operator- (int x)
+ // long operator- (long x)
+ // float operator- (float f)
+ // double operator- (double d)
+ // decimal operator- (decimal d)
+ //
+ Expression expr = null;
+
+ //
+ // transform - - expr into expr
+ //
+ if (Expr is Unary){
+ Unary unary = (Unary) Expr;
+
+ if (unary.Oper == Operator.UnaryNegation)
+ return unary.Expr;
+ }
+
+ //
+ // perform numeric promotions to int,
+ // long, double.
+ //
+ //
+ // The following is inneficient, because we call
+ // ImplicitConversion too many times.
+ //
+ // It is also not clear if we should convert to Float
+ // or Double initially.
+ //
+ if (expr_type == TypeManager.uint32_type){
+ //
+ // FIXME: handle exception to this rule that
+ // permits the int value -2147483648 (-2^31) to
+ // bt wrote as a decimal interger literal
+ //
+ type = TypeManager.int64_type;
+ Expr = Convert.ImplicitConversion (ec, Expr, type, loc);
+ return this;
+ }
+
+ if (expr_type == TypeManager.uint64_type){
+ //
+ // FIXME: Handle exception of `long value'
+ // -92233720368547758087 (-2^63) to be wrote as
+ // decimal integer literal.
+ //
+ Error23 (expr_type);
+ return null;
+ }
+
+ if (expr_type == TypeManager.float_type){
+ type = expr_type;
+ return this;
+ }
+
+ expr = Convert.ImplicitConversion (ec, Expr, TypeManager.int32_type, loc);
+ if (expr != null){
+ Expr = expr;
+ type = expr.Type;
+ return this;
+ }
+
+ expr = Convert.ImplicitConversion (ec, Expr, TypeManager.int64_type, loc);
+ if (expr != null){
+ Expr = expr;
+ type = expr.Type;
+ return this;
+ }
+
+ expr = Convert.ImplicitConversion (ec, Expr, TypeManager.double_type, loc);
+ if (expr != null){
+ Expr = expr;
+ type = expr.Type;
+ return this;
+ }
+
+ Error23 (expr_type);
+ return null;
+ }
+
+ Error (187, "No such operator '" + OperName (Oper) + "' defined for type '" +
+ TypeManager.CSharpName (expr_type) + "'");
+ return null;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (Oper == Operator.AddressOf) {
+ Expr = Expr.DoResolveLValue (ec, new EmptyExpression ());
+
+ if (Expr == null || Expr.eclass != ExprClass.Variable){
+ Error (211, "Cannot take the address of the given expression");
+ return null;
+ }
+ }
+ else
+ Expr = Expr.Resolve (ec);
+
+ if (Expr == null)
+ return null;
+
+#if GMCS_SOURCE
+ if (TypeManager.IsNullableValueType (Expr.Type))
+ return new Nullable.LiftedUnaryOperator (Oper, Expr, loc).Resolve (ec);
+#endif
+
+ eclass = ExprClass.Value;
+ return ResolveOperator (ec);
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right)
+ {
+ if (Oper == Operator.Indirection)
+ return DoResolve (ec);
+
+ return null;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ switch (Oper) {
+ case Operator.UnaryPlus:
+ throw new Exception ("This should be caught by Resolve");
+
+ case Operator.UnaryNegation:
+ if (ec.CheckState && type != TypeManager.float_type && type != TypeManager.double_type) {
+ ig.Emit (OpCodes.Ldc_I4_0);
+ if (type == TypeManager.int64_type)
+ ig.Emit (OpCodes.Conv_U8);
+ Expr.Emit (ec);
+ ig.Emit (OpCodes.Sub_Ovf);
+ } else {
+ Expr.Emit (ec);
+ ig.Emit (OpCodes.Neg);
+ }
+
+ break;
+
+ case Operator.LogicalNot:
+ Expr.Emit (ec);
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Ceq);
+ break;
+
+ case Operator.OnesComplement:
+ Expr.Emit (ec);
+ ig.Emit (OpCodes.Not);
+ break;
+
+ case Operator.AddressOf:
+ ((IMemoryLocation)Expr).AddressOf (ec, AddressOp.LoadStore);
+ break;
+
+ default:
+ throw new Exception ("This should not happen: Operator = "
+ + Oper.ToString ());
+ }
+ }
+
+ public override void EmitBranchable (EmitContext ec, Label target, bool onTrue)
+ {
+ if (Oper == Operator.LogicalNot)
+ Expr.EmitBranchable (ec, target, !onTrue);
+ else
+ base.EmitBranchable (ec, target, onTrue);
+ }
+
+ public override string ToString ()
+ {
+ return "Unary (" + Oper + ", " + Expr + ")";
+ }
+
+ }
+
+ //
+ // Unary operators are turned into Indirection expressions
+ // after semantic analysis (this is so we can take the address
+ // of an indirection).
+ //
+ public class Indirection : Expression, IMemoryLocation, IAssignMethod, IVariable {
+ Expression expr;
+ LocalTemporary temporary;
+ bool prepared;
+
+ public Indirection (Expression expr, Location l)
+ {
+ this.expr = expr;
+ type = TypeManager.HasElementType (expr.Type) ? TypeManager.GetElementType (expr.Type) : expr.Type;
+ eclass = ExprClass.Variable;
+ loc = l;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ if (!prepared)
+ expr.Emit (ec);
+
+ LoadFromPtr (ec.ig, Type);
+ }
+
+ public void Emit (EmitContext ec, bool leave_copy)
+ {
+ Emit (ec);
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temporary = new LocalTemporary (expr.Type);
+ temporary.Store (ec);
+ }
+ }
+
+ public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
+ {
+ prepared = prepare_for_load;
+
+ expr.Emit (ec);
+
+ if (prepare_for_load)
+ ec.ig.Emit (OpCodes.Dup);
+
+ source.Emit (ec);
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temporary = new LocalTemporary (expr.Type);
+ temporary.Store (ec);
+ }
+
+ StoreFromPtr (ec.ig, type);
+
+ if (temporary != null) {
+ temporary.Emit (ec);
+ temporary.Release (ec);
+ }
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp Mode)
+ {
+ expr.Emit (ec);
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ return DoResolve (ec);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // Born fully resolved
+ //
+ return this;
+ }
+
+ public override string ToString ()
+ {
+ return "*(" + expr + ")";
+ }
+
+ #region IVariable Members
+
+ public VariableInfo VariableInfo {
+ get { return null; }
+ }
+
+ public bool VerifyFixed ()
+ {
+ // A pointer-indirection is always fixed.
+ return true;
+ }
+
+ #endregion
+ }
+
+ /// <summary>
+ /// Unary Mutator expressions (pre and post ++ and --)
+ /// </summary>
+ ///
+ /// <remarks>
+ /// UnaryMutator implements ++ and -- expressions. It derives from
+ /// ExpressionStatement becuase the pre/post increment/decrement
+ /// operators can be used in a statement context.
+ ///
+ /// FIXME: Idea, we could split this up in two classes, one simpler
+ /// for the common case, and one with the extra fields for more complex
+ /// classes (indexers require temporary access; overloaded require method)
+ ///
+ /// </remarks>
+ public class UnaryMutator : ExpressionStatement {
+ [Flags]
+ public enum Mode : byte {
+ IsIncrement = 0,
+ IsDecrement = 1,
+ IsPre = 0,
+ IsPost = 2,
+
+ PreIncrement = 0,
+ PreDecrement = IsDecrement,
+ PostIncrement = IsPost,
+ PostDecrement = IsPost | IsDecrement
+ }
+
+ Mode mode;
+ bool is_expr = false;
+ bool recurse = false;
+
+ Expression expr;
+
+ //
+ // This is expensive for the simplest case.
+ //
+ StaticCallExpr method;
+
+ public UnaryMutator (Mode m, Expression e, Location l)
+ {
+ mode = m;
+ loc = l;
+ expr = e;
+ }
+
+ static string OperName (Mode mode)
+ {
+ return (mode == Mode.PreIncrement || mode == Mode.PostIncrement) ?
+ "++" : "--";
+ }
+
+ /// <summary>
+ /// Returns whether an object of type `t' can be incremented
+ /// or decremented with add/sub (ie, basically whether we can
+ /// use pre-post incr-decr operations on it, but it is not a
+ /// System.Decimal, which we require operator overloading to catch)
+ /// </summary>
+ static bool IsIncrementableNumber (Type t)
+ {
+ return (t == TypeManager.sbyte_type) ||
+ (t == TypeManager.byte_type) ||
+ (t == TypeManager.short_type) ||
+ (t == TypeManager.ushort_type) ||
+ (t == TypeManager.int32_type) ||
+ (t == TypeManager.uint32_type) ||
+ (t == TypeManager.int64_type) ||
+ (t == TypeManager.uint64_type) ||
+ (t == TypeManager.char_type) ||
+ (t.IsSubclassOf (TypeManager.enum_type)) ||
+ (t == TypeManager.float_type) ||
+ (t == TypeManager.double_type) ||
+ (t.IsPointer && t != TypeManager.void_ptr_type);
+ }
+
+ Expression ResolveOperator (EmitContext ec)
+ {
+ Type expr_type = expr.Type;
+
+ //
+ // Step 1: Perform Operator Overload location
+ //
+ Expression mg;
+ string op_name;
+
+ if (mode == Mode.PreIncrement || mode == Mode.PostIncrement)
+ op_name = "op_Increment";
+ else
+ op_name = "op_Decrement";
+
+ mg = MemberLookup (ec.ContainerType, expr_type, op_name, MemberTypes.Method, AllBindingFlags, loc);
+
+ if (mg != null) {
+ method = StaticCallExpr.MakeSimpleCall (
+ ec, (MethodGroupExpr) mg, expr, loc);
+
+ type = method.Type;
+ } else if (!IsIncrementableNumber (expr_type)) {
+ Error (187, "No such operator '" + OperName (mode) + "' defined for type '" +
+ TypeManager.CSharpName (expr_type) + "'");
+ return null;
+ }
+
+ //
+ // The operand of the prefix/postfix increment decrement operators
+ // should be an expression that is classified as a variable,
+ // a property access or an indexer access
+ //
+ type = expr_type;
+ if (expr.eclass == ExprClass.Variable){
+ LocalVariableReference var = expr as LocalVariableReference;
+ if ((var != null) && var.IsReadOnly) {
+ Error (1604, "cannot assign to `" + var.Name + "' because it is readonly");
+ return null;
+ }
+ } else if (expr.eclass == ExprClass.IndexerAccess || expr.eclass == ExprClass.PropertyAccess){
+ expr = expr.ResolveLValue (ec, this, Location);
+ if (expr == null)
+ return null;
+ } else {
+ if (expr.eclass == ExprClass.Value) {
+ Error_ValueAssignment (loc);
+ } else {
+ expr.Error_UnexpectedKind (ec.DeclContainer, "variable, indexer or property access", loc);
+ }
+ return null;
+ }
+
+ return this;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+
+ if (expr == null)
+ return null;
+
+ eclass = ExprClass.Value;
+
+#if GMCS_SOURCE
+ if (TypeManager.IsNullableValueType (expr.Type))
+ return new Nullable.LiftedUnaryMutator (mode, expr, loc).Resolve (ec);
+#endif
+
+ return ResolveOperator (ec);
+ }
+
+ static int PtrTypeSize (Type t)
+ {
+ return GetTypeSize (TypeManager.GetElementType (t));
+ }
+
+ //
+ // Loads the proper "1" into the stack based on the type, then it emits the
+ // opcode for the operation requested
+ //
+ void LoadOneAndEmitOp (EmitContext ec, Type t)
+ {
+ //
+ // Measure if getting the typecode and using that is more/less efficient
+ // that comparing types. t.GetTypeCode() is an internal call.
+ //
+ ILGenerator ig = ec.ig;
+
+ if (t == TypeManager.uint64_type || t == TypeManager.int64_type)
+ LongConstant.EmitLong (ig, 1);
+ else if (t == TypeManager.double_type)
+ ig.Emit (OpCodes.Ldc_R8, 1.0);
+ else if (t == TypeManager.float_type)
+ ig.Emit (OpCodes.Ldc_R4, 1.0F);
+ else if (t.IsPointer){
+ int n = PtrTypeSize (t);
+
+ if (n == 0)
+ ig.Emit (OpCodes.Sizeof, t);
+ else
+ IntConstant.EmitInt (ig, n);
+ } else
+ ig.Emit (OpCodes.Ldc_I4_1);
+
+ //
+ // Now emit the operation
+ //
+ if (ec.CheckState){
+ if (t == TypeManager.int32_type ||
+ t == TypeManager.int64_type){
+ if ((mode & Mode.IsDecrement) != 0)
+ ig.Emit (OpCodes.Sub_Ovf);
+ else
+ ig.Emit (OpCodes.Add_Ovf);
+ } else if (t == TypeManager.uint32_type ||
+ t == TypeManager.uint64_type){
+ if ((mode & Mode.IsDecrement) != 0)
+ ig.Emit (OpCodes.Sub_Ovf_Un);
+ else
+ ig.Emit (OpCodes.Add_Ovf_Un);
+ } else {
+ if ((mode & Mode.IsDecrement) != 0)
+ ig.Emit (OpCodes.Sub_Ovf);
+ else
+ ig.Emit (OpCodes.Add_Ovf);
+ }
+ } else {
+ if ((mode & Mode.IsDecrement) != 0)
+ ig.Emit (OpCodes.Sub);
+ else
+ ig.Emit (OpCodes.Add);
+ }
+
+ if (t == TypeManager.sbyte_type){
+ if (ec.CheckState)
+ ig.Emit (OpCodes.Conv_Ovf_I1);
+ else
+ ig.Emit (OpCodes.Conv_I1);
+ } else if (t == TypeManager.byte_type){
+ if (ec.CheckState)
+ ig.Emit (OpCodes.Conv_Ovf_U1);
+ else
+ ig.Emit (OpCodes.Conv_U1);
+ } else if (t == TypeManager.short_type){
+ if (ec.CheckState)
+ ig.Emit (OpCodes.Conv_Ovf_I2);
+ else
+ ig.Emit (OpCodes.Conv_I2);
+ } else if (t == TypeManager.ushort_type || t == TypeManager.char_type){
+ if (ec.CheckState)
+ ig.Emit (OpCodes.Conv_Ovf_U2);
+ else
+ ig.Emit (OpCodes.Conv_U2);
+ }
+
+ }
+
+ void EmitCode (EmitContext ec, bool is_expr)
+ {
+ recurse = true;
+ this.is_expr = is_expr;
+ ((IAssignMethod) expr).EmitAssign (ec, this, is_expr && (mode == Mode.PreIncrement || mode == Mode.PreDecrement), true);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ //
+ // We use recurse to allow ourselfs to be the source
+ // of an assignment. This little hack prevents us from
+ // having to allocate another expression
+ //
+ if (recurse) {
+ ((IAssignMethod) expr).Emit (ec, is_expr && (mode == Mode.PostIncrement || mode == Mode.PostDecrement));
+ if (method == null)
+ LoadOneAndEmitOp (ec, expr.Type);
+ else
+ ec.ig.Emit (OpCodes.Call, method.Method);
+ recurse = false;
+ return;
+ }
+
+ EmitCode (ec, true);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ EmitCode (ec, false);
+ }
+ }
+
+ /// <summary>
+ /// Base class for the `Is' and `As' classes.
+ /// </summary>
+ ///
+ /// <remarks>
+ /// FIXME: Split this in two, and we get to save the `Operator' Oper
+ /// size.
+ /// </remarks>
+ public abstract class Probe : Expression {
+ public Expression ProbeType;
+ protected Expression expr;
+ protected TypeExpr probe_type_expr;
+
+ public Probe (Expression expr, Expression probe_type, Location l)
+ {
+ ProbeType = probe_type;
+ loc = l;
+ this.expr = expr;
+ }
+
+ public Expression Expr {
+ get {
+ return expr;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ probe_type_expr = ProbeType.ResolveAsTypeTerminal (ec, false);
+ if (probe_type_expr == null)
+ return null;
+
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return null;
+
+ if (expr.Type.IsPointer) {
+ Report.Error (244, loc, "\"is\" or \"as\" are not valid on pointer types");
+ return null;
+ }
+ return this;
+ }
+ }
+
+ /// <summary>
+ /// Implementation of the `is' operator.
+ /// </summary>
+ public class Is : Probe {
+ public Is (Expression expr, Expression probe_type, Location l)
+ : base (expr, probe_type, l)
+ {
+ }
+
+ enum Action {
+ AlwaysTrue, AlwaysNull, AlwaysFalse, LeaveOnStack, Probe
+ }
+
+ Action action;
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ expr.Emit (ec);
+
+ switch (action){
+ case Action.AlwaysFalse:
+ ig.Emit (OpCodes.Pop);
+ IntConstant.EmitInt (ig, 0);
+ return;
+ case Action.AlwaysTrue:
+ ig.Emit (OpCodes.Pop);
+ IntConstant.EmitInt (ig, 1);
+ return;
+ case Action.LeaveOnStack:
+ // the `e != null' rule.
+ ig.Emit (OpCodes.Ldnull);
+ ig.Emit (OpCodes.Ceq);
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.Emit (OpCodes.Ceq);
+ return;
+ case Action.Probe:
+ ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
+ ig.Emit (OpCodes.Ldnull);
+ ig.Emit (OpCodes.Cgt_Un);
+ return;
+ }
+ throw new Exception ("never reached");
+ }
+
+ public override void EmitBranchable (EmitContext ec, Label target, bool onTrue)
+ {
+ ILGenerator ig = ec.ig;
+
+ switch (action){
+ case Action.AlwaysFalse:
+ if (! onTrue)
+ ig.Emit (OpCodes.Br, target);
+
+ return;
+ case Action.AlwaysTrue:
+ if (onTrue)
+ ig.Emit (OpCodes.Br, target);
+
+ return;
+ case Action.LeaveOnStack:
+ // the `e != null' rule.
+ expr.Emit (ec);
+ ig.Emit (onTrue ? OpCodes.Brtrue : OpCodes.Brfalse, target);
+ return;
+ case Action.Probe:
+ expr.Emit (ec);
+ ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
+ ig.Emit (onTrue ? OpCodes.Brtrue : OpCodes.Brfalse, target);
+ return;
+ }
+ throw new Exception ("never reached");
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ Expression e = base.DoResolve (ec);
+
+ if ((e == null) || (expr == null))
+ return null;
+
+ Type etype = expr.Type;
+ type = TypeManager.bool_type;
+ eclass = ExprClass.Value;
+
+ //
+ // First case, if at compile time, there is an implicit conversion
+ // then e != null (objects) or true (value types)
+ //
+ Type probe_type = probe_type_expr.Type;
+ e = Convert.ImplicitConversionStandard (ec, expr, probe_type, loc);
+ if (e != null){
+ expr = e;
+ if (etype.IsValueType)
+ action = Action.AlwaysTrue;
+ else
+ action = Action.LeaveOnStack;
+
+ Constant c = e as Constant;
+ if (c != null && c.GetValue () == null) {
+ action = Action.AlwaysFalse;
+ Report.Warning (184, 1, loc, "The given expression is never of the provided (`{0}') type",
+ TypeManager.CSharpName (probe_type));
+ } else {
+ Report.Warning (183, 1, loc, "The given expression is always of the provided (`{0}') type",
+ TypeManager.CSharpName (probe_type));
+ }
+ return this;
+ }
+
+ if (Convert.ExplicitReferenceConversionExists (etype, probe_type)){
+ if (TypeManager.IsGenericParameter (etype))
+ expr = new BoxedCast (expr, etype);
+
+ //
+ // Second case: explicit reference convresion
+ //
+ if (expr is NullLiteral)
+ action = Action.AlwaysFalse;
+ else
+ action = Action.Probe;
+ } else if (TypeManager.ContainsGenericParameters (etype) ||
+ TypeManager.ContainsGenericParameters (probe_type)) {
+ expr = new BoxedCast (expr, etype);
+ action = Action.Probe;
+ } else {
+ action = Action.AlwaysFalse;
+ if (!(probe_type.IsInterface || expr.Type.IsInterface))
+ Report.Warning (184, 1, loc, "The given expression is never of the provided (`{0}') type", TypeManager.CSharpName (probe_type));
+ }
+
+ return this;
+ }
+ }
+
+ /// <summary>
+ /// Implementation of the `as' operator.
+ /// </summary>
+ public class As : Probe {
+ public As (Expression expr, Expression probe_type, Location l)
+ : base (expr, probe_type, l)
+ {
+ }
+
+ bool do_isinst = false;
+ Expression resolved_type;
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ expr.Emit (ec);
+
+ if (do_isinst)
+ ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
+ }
+
+ static void Error_CannotConvertType (Type source, Type target, Location loc)
+ {
+ Report.Error (39, loc, "Cannot convert type `{0}' to `{1}' via a built-in conversion",
+ TypeManager.CSharpName (source),
+ TypeManager.CSharpName (target));
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (resolved_type == null) {
+ resolved_type = base.DoResolve (ec);
+
+ if (resolved_type == null)
+ return null;
+ }
+
+ type = probe_type_expr.Type;
+ eclass = ExprClass.Value;
+ Type etype = expr.Type;
+
+ if (type.IsValueType) {
+ Report.Error (77, loc, "The as operator must be used with a reference type (`" +
+ TypeManager.CSharpName (type) + "' is a value type)");
+ return null;
+
+ }
+
+#if GMCS_SOURCE
+ //
+ // If the type is a type parameter, ensure
+ // that it is constrained by a class
+ //
+ TypeParameterExpr tpe = probe_type_expr as TypeParameterExpr;
+ if (tpe != null){
+ Constraints constraints = tpe.TypeParameter.Constraints;
+ bool error = false;
+
+ if (constraints == null)
+ error = true;
+ else {
+ if (!constraints.HasClassConstraint)
+ if ((constraints.Attributes & GenericParameterAttributes.ReferenceTypeConstraint) == 0)
+ error = true;
+ }
+ if (error){
+ Report.Error (413, loc,
+ "The as operator requires that the `{0}' type parameter be constrained by a class",
+ probe_type_expr.GetSignatureForError ());
+ return null;
+ }
+ }
+#endif
+
+ Expression e = Convert.ImplicitConversion (ec, expr, type, loc);
+ if (e != null){
+ expr = e;
+ do_isinst = false;
+ return this;
+ }
+
+ if (Convert.ExplicitReferenceConversionExists (etype, type)){
+ if (TypeManager.IsGenericParameter (etype))
+ expr = new BoxedCast (expr, etype);
+
+ do_isinst = true;
+ return this;
+ }
+
+ if (TypeManager.ContainsGenericParameters (etype) ||
+ TypeManager.ContainsGenericParameters (type)) {
+ expr = new BoxedCast (expr, etype);
+ do_isinst = true;
+ return this;
+ }
+
+ Error_CannotConvertType (etype, type, loc);
+ return null;
+ }
+
+ public override bool GetAttributableValue (Type valueType, out object value)
+ {
+ return expr.GetAttributableValue (valueType, out value);
+ }
+ }
+
+ /// <summary>
+ /// This represents a typecast in the source language.
+ ///
+ /// FIXME: Cast expressions have an unusual set of parsing
+ /// rules, we need to figure those out.
+ /// </summary>
+ public class Cast : Expression {
+ Expression target_type;
+ Expression expr;
+
+ public Cast (Expression cast_type, Expression expr)
+ : this (cast_type, expr, cast_type.Location)
+ {
+ }
+
+ public Cast (Expression cast_type, Expression expr, Location loc)
+ {
+ this.target_type = cast_type;
+ this.expr = expr;
+ this.loc = loc;
+
+ if (target_type == TypeManager.system_void_expr)
+ Error_VoidInvalidInTheContext (loc);
+ }
+
+ public Expression TargetType {
+ get { return target_type; }
+ }
+
+ public Expression Expr {
+ get { return expr; }
+ set { expr = value; }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return null;
+
+ TypeExpr target = target_type.ResolveAsTypeTerminal (ec, false);
+ if (target == null)
+ return null;
+
+ type = target.Type;
+
+ if (type.IsAbstract && type.IsSealed) {
+ Report.Error (716, loc, "Cannot convert to static type `{0}'", TypeManager.CSharpName (type));
+ return null;
+ }
+
+ eclass = ExprClass.Value;
+
+ Constant c = expr as Constant;
+ if (c != null) {
+ try {
+ c = c.TryReduce (ec, type, loc);
+ if (c != null)
+ return c;
+ }
+ catch (OverflowException) {
+ return null;
+ }
+ }
+
+ if (type.IsPointer && !ec.InUnsafe) {
+ UnsafeError (loc);
+ return null;
+ }
+ expr = Convert.ExplicitConversion (ec, expr, type, loc);
+ return expr;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should not happen");
+ }
+ }
+
+ /// <summary>
+ /// Binary operators
+ /// </summary>
+ public class Binary : Expression {
+ public enum Operator : byte {
+ Multiply, Division, Modulus,
+ Addition, Subtraction,
+ LeftShift, RightShift,
+ LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
+ Equality, Inequality,
+ BitwiseAnd,
+ ExclusiveOr,
+ BitwiseOr,
+ LogicalAnd,
+ LogicalOr,
+ TOP
+ }
+
+ Operator oper;
+ Expression left, right;
+
+ // This must be kept in sync with Operator!!!
+ public static readonly string [] oper_names;
+
+ static Binary ()
+ {
+ oper_names = new string [(int) Operator.TOP];
+
+ oper_names [(int) Operator.Multiply] = "op_Multiply";
+ oper_names [(int) Operator.Division] = "op_Division";
+ oper_names [(int) Operator.Modulus] = "op_Modulus";
+ oper_names [(int) Operator.Addition] = "op_Addition";
+ oper_names [(int) Operator.Subtraction] = "op_Subtraction";
+ oper_names [(int) Operator.LeftShift] = "op_LeftShift";
+ oper_names [(int) Operator.RightShift] = "op_RightShift";
+ oper_names [(int) Operator.LessThan] = "op_LessThan";
+ oper_names [(int) Operator.GreaterThan] = "op_GreaterThan";
+ oper_names [(int) Operator.LessThanOrEqual] = "op_LessThanOrEqual";
+ oper_names [(int) Operator.GreaterThanOrEqual] = "op_GreaterThanOrEqual";
+ oper_names [(int) Operator.Equality] = "op_Equality";
+ oper_names [(int) Operator.Inequality] = "op_Inequality";
+ oper_names [(int) Operator.BitwiseAnd] = "op_BitwiseAnd";
+ oper_names [(int) Operator.BitwiseOr] = "op_BitwiseOr";
+ oper_names [(int) Operator.ExclusiveOr] = "op_ExclusiveOr";
+ oper_names [(int) Operator.LogicalOr] = "op_LogicalOr";
+ oper_names [(int) Operator.LogicalAnd] = "op_LogicalAnd";
+ }
+
+ public Binary (Operator oper, Expression left, Expression right)
+ {
+ this.oper = oper;
+ this.left = left;
+ this.right = right;
+ this.loc = left.Location;
+ }
+
+ public Operator Oper {
+ get {
+ return oper;
+ }
+ set {
+ oper = value;
+ }
+ }
+
+ public Expression Left {
+ get {
+ return left;
+ }
+ set {
+ left = value;
+ }
+ }
+
+ public Expression Right {
+ get {
+ return right;
+ }
+ set {
+ right = value;
+ }
+ }
+
+
+ /// <summary>
+ /// Returns a stringified representation of the Operator
+ /// </summary>
+ public static string OperName (Operator oper)
+ {
+ switch (oper){
+ case Operator.Multiply:
+ return "*";
+ case Operator.Division:
+ return "/";
+ case Operator.Modulus:
+ return "%";
+ case Operator.Addition:
+ return "+";
+ case Operator.Subtraction:
+ return "-";
+ case Operator.LeftShift:
+ return "<<";
+ case Operator.RightShift:
+ return ">>";
+ case Operator.LessThan:
+ return "<";
+ case Operator.GreaterThan:
+ return ">";
+ case Operator.LessThanOrEqual:
+ return "<=";
+ case Operator.GreaterThanOrEqual:
+ return ">=";
+ case Operator.Equality:
+ return "==";
+ case Operator.Inequality:
+ return "!=";
+ case Operator.BitwiseAnd:
+ return "&";
+ case Operator.BitwiseOr:
+ return "|";
+ case Operator.ExclusiveOr:
+ return "^";
+ case Operator.LogicalOr:
+ return "||";
+ case Operator.LogicalAnd:
+ return "&&";
+ }
+
+ return oper.ToString ();
+ }
+
+ public override string ToString ()
+ {
+ return "operator " + OperName (oper) + "(" + left.ToString () + ", " +
+ right.ToString () + ")";
+ }
+
+ Expression ForceConversion (EmitContext ec, Expression expr, Type target_type)
+ {
+ if (expr.Type == target_type)
+ return expr;
+
+ return Convert.ImplicitConversion (ec, expr, target_type, loc);
+ }
+
+ public static void Error_OperatorAmbiguous (Location loc, Operator oper, Type l, Type r)
+ {
+ Report.Error (
+ 34, loc, "Operator `" + OperName (oper)
+ + "' is ambiguous on operands of type `"
+ + TypeManager.CSharpName (l) + "' "
+ + "and `" + TypeManager.CSharpName (r)
+ + "'");
+ }
+
+ bool IsConvertible (EmitContext ec, Expression le, Expression re, Type t)
+ {
+ return Convert.ImplicitConversionExists (ec, le, t) && Convert.ImplicitConversionExists (ec, re, t);
+ }
+
+ bool VerifyApplicable_Predefined (EmitContext ec, Type t)
+ {
+ if (!IsConvertible (ec, left, right, t))
+ return false;
+ left = ForceConversion (ec, left, t);
+ right = ForceConversion (ec, right, t);
+ type = t;
+ return true;
+ }
+
+ bool IsApplicable_String (EmitContext ec, Expression le, Expression re, Operator oper)
+ {
+ bool l = Convert.ImplicitConversionExists (ec, le, TypeManager.string_type);
+ bool r = Convert.ImplicitConversionExists (ec, re, TypeManager.string_type);
+
+ if (oper == Operator.Equality || oper == Operator.Inequality)
+ return l && r;
+ if (oper == Operator.Addition)
+ return l || r;
+ return false;
+ }
+
+ bool OverloadResolve_PredefinedString (EmitContext ec, Operator oper)
+ {
+ if (!IsApplicable_String (ec, left, right, oper))
+ return false;
+ Type t = TypeManager.string_type;
+ if (Convert.ImplicitConversionExists (ec, left, t))
+ left = ForceConversion (ec, left, t);
+ if (Convert.ImplicitConversionExists (ec, right, t))
+ right = ForceConversion (ec, right, t);
+ type = t;
+ return true;
+ }
+
+ bool OverloadResolve_PredefinedIntegral (EmitContext ec)
+ {
+ return VerifyApplicable_Predefined (ec, TypeManager.int32_type) ||
+ VerifyApplicable_Predefined (ec, TypeManager.uint32_type) ||
+ VerifyApplicable_Predefined (ec, TypeManager.int64_type) ||
+ VerifyApplicable_Predefined (ec, TypeManager.uint64_type) ||
+ false;
+ }
+
+ bool OverloadResolve_PredefinedFloating (EmitContext ec)
+ {
+ return VerifyApplicable_Predefined (ec, TypeManager.float_type) ||
+ VerifyApplicable_Predefined (ec, TypeManager.double_type) ||
+ false;
+ }
+
+ static public void Error_OperatorCannotBeApplied (Location loc, string name, Type l, Type r)
+ {
+ Error_OperatorCannotBeApplied (loc, name, TypeManager.CSharpName (l), TypeManager.CSharpName (r));
+ }
+
+ public static void Error_OperatorCannotBeApplied (Location loc, string name, string left, string right)
+ {
+ Report.Error (19, loc, "Operator `{0}' cannot be applied to operands of type `{1}' and `{2}'",
+ name, left, right);
+ }
+
+ void Error_OperatorCannotBeApplied ()
+ {
+ Error_OperatorCannotBeApplied (Location, OperName (oper), TypeManager.CSharpName (left.Type),
+ TypeManager.CSharpName(right.Type));
+ }
+
+ static bool is_unsigned (Type t)
+ {
+ return (t == TypeManager.uint32_type || t == TypeManager.uint64_type ||
+ t == TypeManager.short_type || t == TypeManager.byte_type);
+ }
+
+ Expression Make32or64 (EmitContext ec, Expression e)
+ {
+ Type t= e.Type;
+
+ if (t == TypeManager.int32_type || t == TypeManager.uint32_type ||
+ t == TypeManager.int64_type || t == TypeManager.uint64_type)
+ return e;
+ Expression ee = Convert.ImplicitConversion (ec, e, TypeManager.int32_type, loc);
+ if (ee != null)
+ return ee;
+ ee = Convert.ImplicitConversion (ec, e, TypeManager.uint32_type, loc);
+ if (ee != null)
+ return ee;
+ ee = Convert.ImplicitConversion (ec, e, TypeManager.int64_type, loc);
+ if (ee != null)
+ return ee;
+ ee = Convert.ImplicitConversion (ec, e, TypeManager.uint64_type, loc);
+ if (ee != null)
+ return ee;
+ return null;
+ }
+
+ Expression CheckShiftArguments (EmitContext ec)
+ {
+ Expression new_left = Make32or64 (ec, left);
+ Expression new_right = ForceConversion (ec, right, TypeManager.int32_type);
+ if (new_left == null || new_right == null) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+ type = new_left.Type;
+ int shiftmask = (type == TypeManager.int32_type || type == TypeManager.uint32_type) ? 31 : 63;
+ left = new_left;
+ right = new Binary (Binary.Operator.BitwiseAnd, new_right, new IntConstant (shiftmask, loc)).DoResolve (ec);
+ return this;
+ }
+
+ //
+ // This is used to check if a test 'x == null' can be optimized to a reference equals,
+ // i.e., not invoke op_Equality.
+ //
+ static bool EqualsNullIsReferenceEquals (Type t)
+ {
+ return t == TypeManager.object_type || t == TypeManager.string_type ||
+ t == TypeManager.delegate_type || t.IsSubclassOf (TypeManager.delegate_type);
+ }
+
+ static void Warning_UnintendedReferenceComparison (Location loc, string side, Type type)
+ {
+ Report.Warning ((side == "left" ? 252 : 253), 2, loc,
+ "Possible unintended reference comparison; to get a value comparison, " +
+ "cast the {0} hand side to type `{1}'.", side, TypeManager.CSharpName (type));
+ }
+
+ Expression ResolveOperator (EmitContext ec)
+ {
+ Type l = left.Type;
+ Type r = right.Type;
+
+ if (oper == Operator.Equality || oper == Operator.Inequality){
+ if (TypeManager.IsGenericParameter (l) && (right is NullLiteral)) {
+ if (l.BaseType == TypeManager.value_type) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ left = new BoxedCast (left, TypeManager.object_type);
+ Type = TypeManager.bool_type;
+ return this;
+ }
+
+ if (TypeManager.IsGenericParameter (r) && (left is NullLiteral)) {
+ if (r.BaseType == TypeManager.value_type) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ right = new BoxedCast (right, TypeManager.object_type);
+ Type = TypeManager.bool_type;
+ return this;
+ }
+
+ //
+ // Optimize out call to op_Equality in a few cases.
+ //
+ if ((l == TypeManager.null_type && EqualsNullIsReferenceEquals (r)) ||
+ (r == TypeManager.null_type && EqualsNullIsReferenceEquals (l))) {
+ Type = TypeManager.bool_type;
+ return this;
+ }
+
+ // IntPtr equality
+ if (l == TypeManager.intptr_type && r == TypeManager.intptr_type) {
+ Type = TypeManager.bool_type;
+ return this;
+ }
+ }
+
+ //
+ // Do not perform operator overload resolution when both sides are
+ // built-in types
+ //
+ Expression left_operators = null, right_operators = null;
+ if (!(TypeManager.IsPrimitiveType (l) && TypeManager.IsPrimitiveType (r))) {
+ //
+ // Step 1: Perform Operator Overload location
+ //
+ string op = oper_names [(int) oper];
+
+ MethodGroupExpr union;
+ left_operators = MemberLookup (ec.ContainerType, l, op, MemberTypes.Method, AllBindingFlags, loc);
+ if (r != l){
+ right_operators = MemberLookup (
+ ec.ContainerType, r, op, MemberTypes.Method, AllBindingFlags, loc);
+ union = Invocation.MakeUnionSet (left_operators, right_operators, loc);
+ } else
+ union = (MethodGroupExpr) left_operators;
+
+ if (union != null) {
+ ArrayList args = new ArrayList (2);
+ args.Add (new Argument (left, Argument.AType.Expression));
+ args.Add (new Argument (right, Argument.AType.Expression));
+
+ MethodBase method = Invocation.OverloadResolve (ec, union, args, true, Location.Null);
+
+ if (method != null) {
+ MethodInfo mi = (MethodInfo) method;
+ return new BinaryMethod (mi.ReturnType, method, args);
+ }
+ }
+ }
+
+ //
+ // Step 0: String concatenation (because overloading will get this wrong)
+ //
+ if (oper == Operator.Addition){
+ //
+ // If any of the arguments is a string, cast to string
+ //
+
+ // Simple constant folding
+ if (left is StringConstant && right is StringConstant)
+ return new StringConstant (((StringConstant) left).Value + ((StringConstant) right).Value, left.Location);
+
+ if (l == TypeManager.string_type || r == TypeManager.string_type) {
+
+ if (r == TypeManager.void_type || l == TypeManager.void_type) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ // try to fold it in on the left
+ if (left is StringConcat) {
+
+ //
+ // We have to test here for not-null, since we can be doubly-resolved
+ // take care of not appending twice
+ //
+ if (type == null){
+ type = TypeManager.string_type;
+ ((StringConcat) left).Append (ec, right);
+ return left.Resolve (ec);
+ } else {
+ return left;
+ }
+ }
+
+ // Otherwise, start a new concat expression
+ return new StringConcat (ec, loc, left, right).Resolve (ec);
+ }
+
+ //
+ // Transform a + ( - b) into a - b
+ //
+ if (right is Unary){
+ Unary right_unary = (Unary) right;
+
+ if (right_unary.Oper == Unary.Operator.UnaryNegation){
+ oper = Operator.Subtraction;
+ right = right_unary.Expr;
+ r = right.Type;
+ }
+ }
+ }
+
+ if (oper == Operator.Equality || oper == Operator.Inequality){
+ if (l == TypeManager.bool_type || r == TypeManager.bool_type){
+ if (r != TypeManager.bool_type || l != TypeManager.bool_type){
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ if (l.IsPointer || r.IsPointer) {
+ if (l.IsPointer && r.IsPointer) {
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ if (l.IsPointer && r == TypeManager.null_type) {
+ right = new EmptyCast (NullPointer.Null, l);
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ if (r.IsPointer && l == TypeManager.null_type) {
+ left = new EmptyCast (NullPointer.Null, r);
+ type = TypeManager.bool_type;
+ return this;
+ }
+ }
+
+#if GMCS_SOURCE
+ if (l.IsGenericParameter && r.IsGenericParameter) {
+ GenericConstraints l_gc, r_gc;
+
+ l_gc = TypeManager.GetTypeParameterConstraints (l);
+ r_gc = TypeManager.GetTypeParameterConstraints (r);
+
+ if ((l_gc == null) || (r_gc == null) ||
+ !(l_gc.HasReferenceTypeConstraint || l_gc.HasClassConstraint) ||
+ !(r_gc.HasReferenceTypeConstraint || r_gc.HasClassConstraint)) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ }
+#endif
+
+ //
+ // operator != (object a, object b)
+ // operator == (object a, object b)
+ //
+ // For this to be used, both arguments have to be reference-types.
+ // Read the rationale on the spec (14.9.6)
+ //
+ if (!(l.IsValueType || r.IsValueType)){
+ type = TypeManager.bool_type;
+
+ if (l == r)
+ return this;
+
+ //
+ // Also, a standard conversion must exist from either one
+ //
+ bool left_to_right =
+ Convert.ImplicitStandardConversionExists (left, r);
+ bool right_to_left = !left_to_right &&
+ Convert.ImplicitStandardConversionExists (right, l);
+
+ if (!left_to_right && !right_to_left) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ if (left_to_right && left_operators != null &&
+ RootContext.WarningLevel >= 2) {
+ ArrayList args = new ArrayList (2);
+ args.Add (new Argument (left, Argument.AType.Expression));
+ args.Add (new Argument (left, Argument.AType.Expression));
+ MethodBase method = Invocation.OverloadResolve (
+ ec, (MethodGroupExpr) left_operators, args, true, Location.Null);
+ if (method != null)
+ Warning_UnintendedReferenceComparison (loc, "right", l);
+ }
+
+ if (right_to_left && right_operators != null &&
+ RootContext.WarningLevel >= 2) {
+ ArrayList args = new ArrayList (2);
+ args.Add (new Argument (right, Argument.AType.Expression));
+ args.Add (new Argument (right, Argument.AType.Expression));
+ MethodBase method = Invocation.OverloadResolve (
+ ec, (MethodGroupExpr) right_operators, args, true, Location.Null);
+ if (method != null)
+ Warning_UnintendedReferenceComparison (loc, "left", r);
+ }
+
+ //
+ // We are going to have to convert to an object to compare
+ //
+ if (l != TypeManager.object_type)
+ left = new EmptyCast (left, TypeManager.object_type);
+ if (r != TypeManager.object_type)
+ right = new EmptyCast (right, TypeManager.object_type);
+
+ return this;
+ }
+ }
+
+ // Only perform numeric promotions on:
+ // +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
+ //
+ if (oper == Operator.Addition || oper == Operator.Subtraction) {
+ if (TypeManager.IsDelegateType (l)){
+ if (((right.eclass == ExprClass.MethodGroup) ||
+ (r == TypeManager.anonymous_method_type))){
+ if ((RootContext.Version != LanguageVersion.ISO_1)){
+ Expression tmp = Convert.ImplicitConversionRequired (ec, right, l, loc);
+ if (tmp == null)
+ return null;
+ right = tmp;
+ r = right.Type;
+ }
+ }
+
+ if (TypeManager.IsDelegateType (r) || right is NullLiteral){
+ MethodInfo method;
+ ArrayList args = new ArrayList (2);
+
+ args = new ArrayList (2);
+ args.Add (new Argument (left, Argument.AType.Expression));
+ args.Add (new Argument (right, Argument.AType.Expression));
+
+ if (oper == Operator.Addition)
+ method = TypeManager.delegate_combine_delegate_delegate;
+ else
+ method = TypeManager.delegate_remove_delegate_delegate;
+
+ if (!TypeManager.IsEqual (l, r) && !(right is NullLiteral)) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ return new BinaryDelegate (l, method, args);
+ }
+ }
+
+ //
+ // Pointer arithmetic:
+ //
+ // T* operator + (T* x, int y);
+ // T* operator + (T* x, uint y);
+ // T* operator + (T* x, long y);
+ // T* operator + (T* x, ulong y);
+ //
+ // T* operator + (int y, T* x);
+ // T* operator + (uint y, T *x);
+ // T* operator + (long y, T *x);
+ // T* operator + (ulong y, T *x);
+ //
+ // T* operator - (T* x, int y);
+ // T* operator - (T* x, uint y);
+ // T* operator - (T* x, long y);
+ // T* operator - (T* x, ulong y);
+ //
+ // long operator - (T* x, T *y)
+ //
+ if (l.IsPointer){
+ if (r.IsPointer && oper == Operator.Subtraction){
+ if (r == l)
+ return new PointerArithmetic (
+ false, left, right, TypeManager.int64_type,
+ loc).Resolve (ec);
+ } else {
+ Expression t = Make32or64 (ec, right);
+ if (t != null)
+ return new PointerArithmetic (oper == Operator.Addition, left, t, l, loc).Resolve (ec);
+ }
+ } else if (r.IsPointer && oper == Operator.Addition){
+ Expression t = Make32or64 (ec, left);
+ if (t != null)
+ return new PointerArithmetic (true, right, t, r, loc).Resolve (ec);
+ }
+ }
+
+ //
+ // Enumeration operators
+ //
+ bool lie = TypeManager.IsEnumType (l);
+ bool rie = TypeManager.IsEnumType (r);
+ if (lie || rie){
+ Expression temp;
+
+ // U operator - (E e, E f)
+ if (lie && rie){
+ if (oper == Operator.Subtraction){
+ if (l == r){
+ type = TypeManager.EnumToUnderlying (l);
+ return this;
+ }
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+ }
+
+ //
+ // operator + (E e, U x)
+ // operator - (E e, U x)
+ //
+ if (oper == Operator.Addition || oper == Operator.Subtraction){
+ Type enum_type = lie ? l : r;
+ Type other_type = lie ? r : l;
+ Type underlying_type = TypeManager.EnumToUnderlying (enum_type);
+
+ if (underlying_type != other_type){
+ temp = Convert.ImplicitConversion (ec, lie ? right : left, underlying_type, loc);
+ if (temp != null){
+ if (lie)
+ right = temp;
+ else
+ left = temp;
+ type = enum_type;
+ return this;
+ }
+
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ type = enum_type;
+ return this;
+ }
+
+ if (!rie){
+ temp = Convert.ImplicitConversion (ec, right, l, loc);
+ if (temp != null)
+ right = temp;
+ else {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+ } if (!lie){
+ temp = Convert.ImplicitConversion (ec, left, r, loc);
+ if (temp != null){
+ left = temp;
+ l = r;
+ } else {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+ }
+
+ if (oper == Operator.Equality || oper == Operator.Inequality ||
+ oper == Operator.LessThanOrEqual || oper == Operator.LessThan ||
+ oper == Operator.GreaterThanOrEqual || oper == Operator.GreaterThan){
+ if (left.Type != right.Type){
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ if (oper == Operator.BitwiseAnd ||
+ oper == Operator.BitwiseOr ||
+ oper == Operator.ExclusiveOr){
+ if (left.Type != right.Type){
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+ type = l;
+ return this;
+ }
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ if (oper == Operator.LeftShift || oper == Operator.RightShift)
+ return CheckShiftArguments (ec);
+
+ if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
+ if (l == TypeManager.bool_type && r == TypeManager.bool_type) {
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ if (l != r) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ Expression e = new ConditionalLogicalOperator (
+ oper == Operator.LogicalAnd, left, right, l, loc);
+ return e.Resolve (ec);
+ }
+
+ Expression orig_left = left;
+ Expression orig_right = right;
+
+ //
+ // operator & (bool x, bool y)
+ // operator | (bool x, bool y)
+ // operator ^ (bool x, bool y)
+ //
+ if (oper == Operator.BitwiseAnd ||
+ oper == Operator.BitwiseOr ||
+ oper == Operator.ExclusiveOr) {
+ if (OverloadResolve_PredefinedIntegral (ec)) {
+ if (IsConvertible (ec, orig_left, orig_right, TypeManager.bool_type)) {
+ Error_OperatorAmbiguous (loc, oper, l, r);
+ return null;
+ }
+
+ if (oper == Operator.BitwiseOr && l != r && !(orig_right is Constant) && right is OpcodeCast &&
+ (r == TypeManager.sbyte_type || r == TypeManager.short_type ||
+ r == TypeManager.int32_type || r == TypeManager.int64_type)) {
+ Report.Warning (675, 3, loc, "The operator `|' used on the sign-extended type `{0}'. Consider casting to a smaller unsigned type first",
+ TypeManager.CSharpName (r));
+ }
+
+ } else if (!VerifyApplicable_Predefined (ec, TypeManager.bool_type)) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+ return this;
+ }
+
+ //
+ // Pointer comparison
+ //
+ if (l.IsPointer && r.IsPointer){
+ if (oper == Operator.LessThan || oper == Operator.LessThanOrEqual ||
+ oper == Operator.GreaterThan || oper == Operator.GreaterThanOrEqual){
+ type = TypeManager.bool_type;
+ return this;
+ }
+ }
+
+ if (OverloadResolve_PredefinedIntegral (ec)) {
+ if (IsApplicable_String (ec, orig_left, orig_right, oper)) {
+ Error_OperatorAmbiguous (loc, oper, l, r);
+ return null;
+ }
+ } else if (OverloadResolve_PredefinedFloating (ec)) {
+ if (IsConvertible (ec, orig_left, orig_right, TypeManager.decimal_type) ||
+ IsApplicable_String (ec, orig_left, orig_right, oper)) {
+ Error_OperatorAmbiguous (loc, oper, l, r);
+ return null;
+ }
+ } else if (VerifyApplicable_Predefined (ec, TypeManager.decimal_type)) {
+ if (IsApplicable_String (ec, orig_left, orig_right, oper)) {
+ Error_OperatorAmbiguous (loc, oper, l, r);
+ return null;
+ }
+ } else if (!OverloadResolve_PredefinedString (ec, oper)) {
+ Error_OperatorCannotBeApplied ();
+ return null;
+ }
+
+ if (oper == Operator.Equality ||
+ oper == Operator.Inequality ||
+ oper == Operator.LessThanOrEqual ||
+ oper == Operator.LessThan ||
+ oper == Operator.GreaterThanOrEqual ||
+ oper == Operator.GreaterThan)
+ type = TypeManager.bool_type;
+
+ l = left.Type;
+ r = right.Type;
+
+ if (l == TypeManager.decimal_type || l == TypeManager.string_type || r == TypeManager.string_type) {
+ Type lookup = l;
+ if (r == TypeManager.string_type)
+ lookup = r;
+ MethodGroupExpr ops = (MethodGroupExpr) MemberLookup (
+ ec.ContainerType, lookup, oper_names [(int) oper],
+ MemberTypes.Method, AllBindingFlags, loc);
+ ArrayList args = new ArrayList (2);
+ args.Add (new Argument (left, Argument.AType.Expression));
+ args.Add (new Argument (right, Argument.AType.Expression));
+ MethodBase method = Invocation.OverloadResolve (ec, ops, args, true, Location.Null);
+ return new BinaryMethod (type, method, args);
+ }
+
+ return this;
+ }
+
+ Constant EnumLiftUp (Constant left, Constant right)
+ {
+ switch (oper) {
+ case Operator.BitwiseOr:
+ case Operator.BitwiseAnd:
+ case Operator.ExclusiveOr:
+ case Operator.Equality:
+ case Operator.Inequality:
+ case Operator.LessThan:
+ case Operator.LessThanOrEqual:
+ case Operator.GreaterThan:
+ case Operator.GreaterThanOrEqual:
+ if (left is EnumConstant)
+ return left;
+
+ if (left.IsZeroInteger)
+ return new EnumConstant (left, right.Type);
+
+ break;
+
+ case Operator.Addition:
+ case Operator.Subtraction:
+ return left;
+
+ case Operator.Multiply:
+ case Operator.Division:
+ case Operator.Modulus:
+ case Operator.LeftShift:
+ case Operator.RightShift:
+ if (right is EnumConstant || left is EnumConstant)
+ break;
+ return left;
+ }
+ Error_OperatorCannotBeApplied (loc, Binary.OperName (oper), left.Type, right.Type);
+ return null;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (left == null)
+ return null;
+
+ if ((oper == Operator.Subtraction) && (left is ParenthesizedExpression)) {
+ left = ((ParenthesizedExpression) left).Expr;
+ left = left.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.Type);
+ if (left == null)
+ return null;
+
+ if (left.eclass == ExprClass.Type) {
+ Report.Error (75, loc, "To cast a negative value, you must enclose the value in parentheses");
+ return null;
+ }
+ } else
+ left = left.Resolve (ec);
+
+ if (left == null)
+ return null;
+
+ Constant lc = left as Constant;
+ if (lc != null && lc.Type == TypeManager.bool_type &&
+ ((oper == Operator.LogicalAnd && (bool)lc.GetValue () == false) ||
+ (oper == Operator.LogicalOr && (bool)lc.GetValue () == true))) {
+
+ // TODO: make a sense to resolve unreachable expression as we do for statement
+ Report.Warning (429, 4, loc, "Unreachable expression code detected");
+ return left;
+ }
+
+ right = right.Resolve (ec);
+ if (right == null)
+ return null;
+
+ eclass = ExprClass.Value;
+ Constant rc = right as Constant;
+
+ // The conversion rules are ignored in enum context but why
+ if (!ec.InEnumContext && lc != null && rc != null && (TypeManager.IsEnumType (left.Type) || TypeManager.IsEnumType (right.Type))) {
+ left = lc = EnumLiftUp (lc, rc);
+ if (lc == null)
+ return null;
+
+ right = rc = EnumLiftUp (rc, lc);
+ if (rc == null)
+ return null;
+ }
+
+ if (oper == Operator.BitwiseAnd) {
+ if (rc != null && rc.IsZeroInteger) {
+ return lc is EnumConstant ?
+ new EnumConstant (rc, lc.Type):
+ rc;
+ }
+
+ if (lc != null && lc.IsZeroInteger) {
+ return rc is EnumConstant ?
+ new EnumConstant (lc, rc.Type):
+ lc;
+ }
+ }
+ else if (oper == Operator.BitwiseOr) {
+ if (lc is EnumConstant &&
+ rc != null && rc.IsZeroInteger)
+ return lc;
+ if (rc is EnumConstant &&
+ lc != null && lc.IsZeroInteger)
+ return rc;
+ } else if (oper == Operator.LogicalAnd) {
+ if (rc != null && rc.IsDefaultValue && rc.Type == TypeManager.bool_type)
+ return rc;
+ if (lc != null && lc.IsDefaultValue && lc.Type == TypeManager.bool_type)
+ return lc;
+ }
+
+ if (rc != null && lc != null){
+ int prev_e = Report.Errors;
+ Expression e = ConstantFold.BinaryFold (
+ ec, oper, lc, rc, loc);
+ if (e != null || Report.Errors != prev_e)
+ return e;
+ }
+
+#if GMCS_SOURCE
+ if ((left is NullLiteral || left.Type.IsValueType) &&
+ (right is NullLiteral || right.Type.IsValueType) &&
+ !(left is NullLiteral && right is NullLiteral) &&
+ (TypeManager.IsNullableType (left.Type) || TypeManager.IsNullableType (right.Type)))
+ return new Nullable.LiftedBinaryOperator (oper, left, right, loc).Resolve (ec);
+#endif
+
+ // Comparison warnings
+ if (oper == Operator.Equality || oper == Operator.Inequality ||
+ oper == Operator.LessThanOrEqual || oper == Operator.LessThan ||
+ oper == Operator.GreaterThanOrEqual || oper == Operator.GreaterThan){
+ if (left.Equals (right)) {
+ Report.Warning (1718, 3, loc, "Comparison made to same variable; did you mean to compare something else?");
+ }
+ CheckUselessComparison (lc, right.Type);
+ CheckUselessComparison (rc, left.Type);
+ }
+
+ return ResolveOperator (ec);
+ }
+
+ public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
+ {
+ return null;
+ }
+
+ private void CheckUselessComparison (Constant c, Type type)
+ {
+ if (c == null || !IsTypeIntegral (type)
+ || c is StringConstant
+ || c is BoolConstant
+ || c is CharConstant
+ || c is FloatConstant
+ || c is DoubleConstant
+ || c is DecimalConstant
+ )
+ return;
+
+ long value = 0;
+
+ if (c is ULongConstant) {
+ ulong uvalue = ((ULongConstant) c).Value;
+ if (uvalue > long.MaxValue) {
+ if (type == TypeManager.byte_type ||
+ type == TypeManager.sbyte_type ||
+ type == TypeManager.short_type ||
+ type == TypeManager.ushort_type ||
+ type == TypeManager.int32_type ||
+ type == TypeManager.uint32_type ||
+ type == TypeManager.int64_type)
+ WarnUselessComparison (type);
+ return;
+ }
+ value = (long) uvalue;
+ }
+ else if (c is ByteConstant)
+ value = ((ByteConstant) c).Value;
+ else if (c is SByteConstant)
+ value = ((SByteConstant) c).Value;
+ else if (c is ShortConstant)
+ value = ((ShortConstant) c).Value;
+ else if (c is UShortConstant)
+ value = ((UShortConstant) c).Value;
+ else if (c is IntConstant)
+ value = ((IntConstant) c).Value;
+ else if (c is UIntConstant)
+ value = ((UIntConstant) c).Value;
+ else if (c is LongConstant)
+ value = ((LongConstant) c).Value;
+
+ if (value != 0) {
+ if (IsValueOutOfRange (value, type))
+ WarnUselessComparison (type);
+ return;
+ }
+ }
+
+ private bool IsValueOutOfRange (long value, Type type)
+ {
+ if (IsTypeUnsigned (type) && value < 0)
+ return true;
+ return type == TypeManager.sbyte_type && (value >= 0x80 || value < -0x80) ||
+ type == TypeManager.byte_type && value >= 0x100 ||
+ type == TypeManager.short_type && (value >= 0x8000 || value < -0x8000) ||
+ type == TypeManager.ushort_type && value >= 0x10000 ||
+ type == TypeManager.int32_type && (value >= 0x80000000 || value < -0x80000000) ||
+ type == TypeManager.uint32_type && value >= 0x100000000;
+ }
+
+ private static bool IsTypeIntegral (Type type)
+ {
+ return type == TypeManager.uint64_type ||
+ type == TypeManager.int64_type ||
+ type == TypeManager.uint32_type ||
+ type == TypeManager.int32_type ||
+ type == TypeManager.ushort_type ||
+ type == TypeManager.short_type ||
+ type == TypeManager.sbyte_type ||
+ type == TypeManager.byte_type;
+ }
+
+ private static bool IsTypeUnsigned (Type type)
+ {
+ return type == TypeManager.uint64_type ||
+ type == TypeManager.uint32_type ||
+ type == TypeManager.ushort_type ||
+ type == TypeManager.byte_type;
+ }
+
+ private void WarnUselessComparison (Type type)
+ {
+ Report.Warning (652, 2, loc, "Comparison to integral constant is useless; the constant is outside the range of type `{0}'",
+ TypeManager.CSharpName (type));
+ }
+
+ /// <remarks>
+ /// EmitBranchable is called from Statement.EmitBoolExpression in the
+ /// context of a conditional bool expression. This function will return
+ /// false if it is was possible to use EmitBranchable, or true if it was.
+ ///
+ /// The expression's code is generated, and we will generate a branch to `target'
+ /// if the resulting expression value is equal to isTrue
+ /// </remarks>
+ public override void EmitBranchable (EmitContext ec, Label target, bool onTrue)
+ {
+ ILGenerator ig = ec.ig;
+
+ //
+ // This is more complicated than it looks, but its just to avoid
+ // duplicated tests: basically, we allow ==, !=, >, <, >= and <=
+ // but on top of that we want for == and != to use a special path
+ // if we are comparing against null
+ //
+ if ((oper == Operator.Equality || oper == Operator.Inequality) && (left is Constant || right is Constant)) {
+ bool my_on_true = oper == Operator.Inequality ? onTrue : !onTrue;
+
+ //
+ // put the constant on the rhs, for simplicity
+ //
+ if (left is Constant) {
+ Expression swap = right;
+ right = left;
+ left = swap;
+ }
+
+ if (((Constant) right).IsZeroInteger) {
+ left.Emit (ec);
+ if (my_on_true)
+ ig.Emit (OpCodes.Brtrue, target);
+ else
+ ig.Emit (OpCodes.Brfalse, target);
+
+ return;
+ } else if (right is BoolConstant) {
+ left.Emit (ec);
+ if (my_on_true != ((BoolConstant) right).Value)
+ ig.Emit (OpCodes.Brtrue, target);
+ else
+ ig.Emit (OpCodes.Brfalse, target);
+
+ return;
+ }
+
+ } else if (oper == Operator.LogicalAnd) {
+
+ if (onTrue) {
+ Label tests_end = ig.DefineLabel ();
+
+ left.EmitBranchable (ec, tests_end, false);
+ right.EmitBranchable (ec, target, true);
+ ig.MarkLabel (tests_end);
+ } else {
+ left.EmitBranchable (ec, target, false);
+ right.EmitBranchable (ec, target, false);
+ }
+
+ return;
+
+ } else if (oper == Operator.LogicalOr){
+ if (onTrue) {
+ left.EmitBranchable (ec, target, true);
+ right.EmitBranchable (ec, target, true);
+
+ } else {
+ Label tests_end = ig.DefineLabel ();
+ left.EmitBranchable (ec, tests_end, true);
+ right.EmitBranchable (ec, target, false);
+ ig.MarkLabel (tests_end);
+ }
+
+ return;
+
+ } else if (!(oper == Operator.LessThan || oper == Operator.GreaterThan ||
+ oper == Operator.LessThanOrEqual || oper == Operator.GreaterThanOrEqual ||
+ oper == Operator.Equality || oper == Operator.Inequality)) {
+ base.EmitBranchable (ec, target, onTrue);
+ return;
+ }
+
+ left.Emit (ec);
+ right.Emit (ec);
+
+ Type t = left.Type;
+ bool isUnsigned = is_unsigned (t) || t == TypeManager.double_type || t == TypeManager.float_type;
+
+ switch (oper){
+ case Operator.Equality:
+ if (onTrue)
+ ig.Emit (OpCodes.Beq, target);
+ else
+ ig.Emit (OpCodes.Bne_Un, target);
+ break;
+
+ case Operator.Inequality:
+ if (onTrue)
+ ig.Emit (OpCodes.Bne_Un, target);
+ else
+ ig.Emit (OpCodes.Beq, target);
+ break;
+
+ case Operator.LessThan:
+ if (onTrue)
+ if (isUnsigned)
+ ig.Emit (OpCodes.Blt_Un, target);
+ else
+ ig.Emit (OpCodes.Blt, target);
+ else
+ if (isUnsigned)
+ ig.Emit (OpCodes.Bge_Un, target);
+ else
+ ig.Emit (OpCodes.Bge, target);
+ break;
+
+ case Operator.GreaterThan:
+ if (onTrue)
+ if (isUnsigned)
+ ig.Emit (OpCodes.Bgt_Un, target);
+ else
+ ig.Emit (OpCodes.Bgt, target);
+ else
+ if (isUnsigned)
+ ig.Emit (OpCodes.Ble_Un, target);
+ else
+ ig.Emit (OpCodes.Ble, target);
+ break;
+
+ case Operator.LessThanOrEqual:
+ if (onTrue)
+ if (isUnsigned)
+ ig.Emit (OpCodes.Ble_Un, target);
+ else
+ ig.Emit (OpCodes.Ble, target);
+ else
+ if (isUnsigned)
+ ig.Emit (OpCodes.Bgt_Un, target);
+ else
+ ig.Emit (OpCodes.Bgt, target);
+ break;
+
+
+ case Operator.GreaterThanOrEqual:
+ if (onTrue)
+ if (isUnsigned)
+ ig.Emit (OpCodes.Bge_Un, target);
+ else
+ ig.Emit (OpCodes.Bge, target);
+ else
+ if (isUnsigned)
+ ig.Emit (OpCodes.Blt_Un, target);
+ else
+ ig.Emit (OpCodes.Blt, target);
+ break;
+ default:
+ Console.WriteLine (oper);
+ throw new Exception ("what is THAT");
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ Type l = left.Type;
+ OpCode opcode;
+
+ //
+ // Handle short-circuit operators differently
+ // than the rest
+ //
+ if (oper == Operator.LogicalAnd) {
+ Label load_zero = ig.DefineLabel ();
+ Label end = ig.DefineLabel ();
+
+ left.EmitBranchable (ec, load_zero, false);
+ right.Emit (ec);
+ ig.Emit (OpCodes.Br, end);
+
+ ig.MarkLabel (load_zero);
+ ig.Emit (OpCodes.Ldc_I4_0);
+ ig.MarkLabel (end);
+ return;
+ } else if (oper == Operator.LogicalOr) {
+ Label load_one = ig.DefineLabel ();
+ Label end = ig.DefineLabel ();
+
+ left.EmitBranchable (ec, load_one, true);
+ right.Emit (ec);
+ ig.Emit (OpCodes.Br, end);
+
+ ig.MarkLabel (load_one);
+ ig.Emit (OpCodes.Ldc_I4_1);
+ ig.MarkLabel (end);
+ return;
+ }
+
+ left.Emit (ec);
+ right.Emit (ec);
+
+ bool isUnsigned = is_unsigned (left.Type);
+
+ switch (oper){
+ case Operator.Multiply:
+ if (ec.CheckState){
+ if (l == TypeManager.int32_type || l == TypeManager.int64_type)
+ opcode = OpCodes.Mul_Ovf;
+ else if (isUnsigned)
+ opcode = OpCodes.Mul_Ovf_Un;
+ else
+ opcode = OpCodes.Mul;
+ } else
+ opcode = OpCodes.Mul;
+
+ break;
+
+ case Operator.Division:
+ if (isUnsigned)
+ opcode = OpCodes.Div_Un;
+ else
+ opcode = OpCodes.Div;
+ break;
+
+ case Operator.Modulus:
+ if (isUnsigned)
+ opcode = OpCodes.Rem_Un;
+ else
+ opcode = OpCodes.Rem;
+ break;
+
+ case Operator.Addition:
+ if (ec.CheckState){
+ if (l == TypeManager.int32_type || l == TypeManager.int64_type)
+ opcode = OpCodes.Add_Ovf;
+ else if (isUnsigned)
+ opcode = OpCodes.Add_Ovf_Un;
+ else
+ opcode = OpCodes.Add;
+ } else
+ opcode = OpCodes.Add;
+ break;
+
+ case Operator.Subtraction:
+ if (ec.CheckState){
+ if (l == TypeManager.int32_type || l == TypeManager.int64_type)
+ opcode = OpCodes.Sub_Ovf;
+ else if (isUnsigned)
+ opcode = OpCodes.Sub_Ovf_Un;
+ else
+ opcode = OpCodes.Sub;
+ } else
+ opcode = OpCodes.Sub;
+ break;
+
+ case Operator.RightShift:
+ if (isUnsigned)
+ opcode = OpCodes.Shr_Un;
+ else
+ opcode = OpCodes.Shr;
+ break;
+
+ case Operator.LeftShift:
+ opcode = OpCodes.Shl;
+ break;
+
+ case Operator.Equality:
+ opcode = OpCodes.Ceq;
+ break;
+
+ case Operator.Inequality:
+ ig.Emit (OpCodes.Ceq);
+ ig.Emit (OpCodes.Ldc_I4_0);
+
+ opcode = OpCodes.Ceq;
+ break;
+
+ case Operator.LessThan:
+ if (isUnsigned)
+ opcode = OpCodes.Clt_Un;
+ else
+ opcode = OpCodes.Clt;
+ break;
+
+ case Operator.GreaterThan:
+ if (isUnsigned)
+ opcode = OpCodes.Cgt_Un;
+ else
+ opcode = OpCodes.Cgt;
+ break;
+
+ case Operator.LessThanOrEqual:
+ Type lt = left.Type;
+
+ if (isUnsigned || (lt == TypeManager.double_type || lt == TypeManager.float_type))
+ ig.Emit (OpCodes.Cgt_Un);
+ else
+ ig.Emit (OpCodes.Cgt);
+ ig.Emit (OpCodes.Ldc_I4_0);
+
+ opcode = OpCodes.Ceq;
+ break;
+
+ case Operator.GreaterThanOrEqual:
+ Type le = left.Type;
+
+ if (isUnsigned || (le == TypeManager.double_type || le == TypeManager.float_type))
+ ig.Emit (OpCodes.Clt_Un);
+ else
+ ig.Emit (OpCodes.Clt);
+
+ ig.Emit (OpCodes.Ldc_I4_0);
+
+ opcode = OpCodes.Ceq;
+ break;
+
+ case Operator.BitwiseOr:
+ opcode = OpCodes.Or;
+ break;
+
+ case Operator.BitwiseAnd:
+ opcode = OpCodes.And;
+ break;
+
+ case Operator.ExclusiveOr:
+ opcode = OpCodes.Xor;
+ break;
+
+ default:
+ throw new Exception ("This should not happen: Operator = "
+ + oper.ToString ());
+ }
+
+ ig.Emit (opcode);
+ }
+ }
+
+ //
+ // Object created by Binary when the binary operator uses an method instead of being
+ // a binary operation that maps to a CIL binary operation.
+ //
+ public class BinaryMethod : Expression {
+ public MethodBase method;
+ public ArrayList Arguments;
+
+ public BinaryMethod (Type t, MethodBase m, ArrayList args)
+ {
+ method = m;
+ Arguments = args;
+ type = t;
+ eclass = ExprClass.Value;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ if (Arguments != null)
+ Invocation.EmitArguments (ec, method, Arguments, false, null);
+
+ if (method is MethodInfo)
+ ig.Emit (OpCodes.Call, (MethodInfo) method);
+ else
+ ig.Emit (OpCodes.Call, (ConstructorInfo) method);
+ }
+ }
+
+ //
+ // Represents the operation a + b [+ c [+ d [+ ...]]], where a is a string
+ // b, c, d... may be strings or objects.
+ //
+ public class StringConcat : Expression {
+ ArrayList operands;
+ bool invalid = false;
+ bool emit_conv_done = false;
+ //
+ // Are we also concating objects?
+ //
+ bool is_strings_only = true;
+
+ public StringConcat (EmitContext ec, Location loc, Expression left, Expression right)
+ {
+ this.loc = loc;
+ type = TypeManager.string_type;
+ eclass = ExprClass.Value;
+
+ operands = new ArrayList (2);
+ Append (ec, left);
+ Append (ec, right);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (invalid)
+ return null;
+
+ return this;
+ }
+
+ public void Append (EmitContext ec, Expression operand)
+ {
+ //
+ // Constant folding
+ //
+ StringConstant sc = operand as StringConstant;
+ if (sc != null) {
+// TODO: it will be better to do this silently as an optimalization
+// int i = 0;
+// string s = "" + i;
+// because this code has poor performace
+// if (sc.Value.Length == 0)
+// Report.Warning (-300, 3, Location, "Appending an empty string has no effect. Did you intend to append a space string?");
+
+ if (operands.Count != 0) {
+ StringConstant last_operand = operands [operands.Count - 1] as StringConstant;
+ if (last_operand != null) {
+ operands [operands.Count - 1] = new StringConstant (last_operand.Value + ((StringConstant) operand).Value, last_operand.Location);
+ return;
+ }
+ }
+ }
+
+ //
+ // Conversion to object
+ //
+ if (operand.Type != TypeManager.string_type) {
+ Expression no = Convert.ImplicitConversion (ec, operand, TypeManager.object_type, loc);
+
+ if (no == null) {
+ Binary.Error_OperatorCannotBeApplied (loc, "+", TypeManager.string_type, operand.Type);
+ invalid = true;
+ }
+ operand = no;
+ }
+
+ operands.Add (operand);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ MethodInfo concat_method = null;
+
+ //
+ // Do conversion to arguments; check for strings only
+ //
+
+ // This can get called multiple times, so we have to deal with that.
+ if (!emit_conv_done) {
+ emit_conv_done = true;
+ for (int i = 0; i < operands.Count; i ++) {
+ Expression e = (Expression) operands [i];
+ is_strings_only &= e.Type == TypeManager.string_type;
+ }
+
+ for (int i = 0; i < operands.Count; i ++) {
+ Expression e = (Expression) operands [i];
+
+ if (! is_strings_only && e.Type == TypeManager.string_type) {
+ // need to make sure this is an object, because the EmitParams
+ // method might look at the type of this expression, see it is a
+ // string and emit a string [] when we want an object [];
+
+ e = new EmptyCast (e, TypeManager.object_type);
+ }
+ operands [i] = new Argument (e, Argument.AType.Expression);
+ }
+ }
+
+ //
+ // Find the right method
+ //
+ switch (operands.Count) {
+ case 1:
+ //
+ // This should not be possible, because simple constant folding
+ // is taken care of in the Binary code.
+ //
+ throw new Exception ("how did you get here?");
+
+ case 2:
+ concat_method = is_strings_only ?
+ TypeManager.string_concat_string_string :
+ TypeManager.string_concat_object_object ;
+ break;
+ case 3:
+ concat_method = is_strings_only ?
+ TypeManager.string_concat_string_string_string :
+ TypeManager.string_concat_object_object_object ;
+ break;
+ case 4:
+ //
+ // There is not a 4 param overlaod for object (the one that there is
+ // is actually a varargs methods, and is only in corlib because it was
+ // introduced there before.).
+ //
+ if (!is_strings_only)
+ goto default;
+
+ concat_method = TypeManager.string_concat_string_string_string_string;
+ break;
+ default:
+ concat_method = is_strings_only ?
+ TypeManager.string_concat_string_dot_dot_dot :
+ TypeManager.string_concat_object_dot_dot_dot ;
+ break;
+ }
+
+ Invocation.EmitArguments (ec, concat_method, operands, false, null);
+ ec.ig.Emit (OpCodes.Call, concat_method);
+ }
+ }
+
+ //
+ // Object created with +/= on delegates
+ //
+ public class BinaryDelegate : Expression {
+ MethodInfo method;
+ ArrayList args;
+
+ public BinaryDelegate (Type t, MethodInfo mi, ArrayList args)
+ {
+ method = mi;
+ this.args = args;
+ type = t;
+ eclass = ExprClass.Value;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ Invocation.EmitArguments (ec, method, args, false, null);
+
+ ig.Emit (OpCodes.Call, (MethodInfo) method);
+ ig.Emit (OpCodes.Castclass, type);
+ }
+
+ public Expression Right {
+ get {
+ Argument arg = (Argument) args [1];
+ return arg.Expr;
+ }
+ }
+
+ public bool IsAddition {
+ get {
+ return method == TypeManager.delegate_combine_delegate_delegate;
+ }
+ }
+ }
+
+ //
+ // User-defined conditional logical operator
+ public class ConditionalLogicalOperator : Expression {
+ Expression left, right;
+ bool is_and;
+
+ public ConditionalLogicalOperator (bool is_and, Expression left, Expression right, Type t, Location loc)
+ {
+ type = t;
+ eclass = ExprClass.Value;
+ this.loc = loc;
+ this.left = left;
+ this.right = right;
+ this.is_and = is_and;
+ }
+
+ protected void Error19 ()
+ {
+ Binary.Error_OperatorCannotBeApplied (loc, is_and ? "&&" : "||", left.GetSignatureForError (), right.GetSignatureForError ());
+ }
+
+ protected void Error218 ()
+ {
+ Error (218, "The type ('" + TypeManager.CSharpName (type) + "') must contain " +
+ "declarations of operator true and operator false");
+ }
+
+ Expression op_true, op_false, op;
+ LocalTemporary left_temp;
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ MethodInfo method;
+ Expression operator_group;
+
+ operator_group = MethodLookup (ec, type, is_and ? "op_BitwiseAnd" : "op_BitwiseOr", loc);
+ if (operator_group == null) {
+ Error19 ();
+ return null;
+ }
+
+ left_temp = new LocalTemporary (type);
+
+ ArrayList arguments = new ArrayList ();
+ arguments.Add (new Argument (left_temp, Argument.AType.Expression));
+ arguments.Add (new Argument (right, Argument.AType.Expression));
+ method = Invocation.OverloadResolve (
+ ec, (MethodGroupExpr) operator_group, arguments, false, loc)
+ as MethodInfo;
+ if (method == null) {
+ Error19 ();
+ return null;
+ }
+
+ if (method.ReturnType != type) {
+ Report.Error (217, loc, "In order to be applicable as a short circuit operator a user-defined logical operator `{0}' " +
+ "must have the same return type as the type of its 2 parameters", TypeManager.CSharpSignature (method));
+ return null;
+ }
+
+ op = new StaticCallExpr (method, arguments, loc);
+
+ op_true = GetOperatorTrue (ec, left_temp, loc);
+ op_false = GetOperatorFalse (ec, left_temp, loc);
+ if ((op_true == null) || (op_false == null)) {
+ Error218 ();
+ return null;
+ }
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ Label false_target = ig.DefineLabel ();
+ Label end_target = ig.DefineLabel ();
+
+ left.Emit (ec);
+ left_temp.Store (ec);
+
+ (is_and ? op_false : op_true).EmitBranchable (ec, false_target, false);
+ left_temp.Emit (ec);
+ ig.Emit (OpCodes.Br, end_target);
+ ig.MarkLabel (false_target);
+ op.Emit (ec);
+ ig.MarkLabel (end_target);
+
+ // We release 'left_temp' here since 'op' may refer to it too
+ left_temp.Release (ec);
+ }
+ }
+
+ public class PointerArithmetic : Expression {
+ Expression left, right;
+ bool is_add;
+
+ //
+ // We assume that `l' is always a pointer
+ //
+ public PointerArithmetic (bool is_addition, Expression l, Expression r, Type t, Location loc)
+ {
+ type = t;
+ this.loc = loc;
+ left = l;
+ right = r;
+ is_add = is_addition;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ eclass = ExprClass.Variable;
+
+ if (left.Type == TypeManager.void_ptr_type) {
+ Error (242, "The operation in question is undefined on void pointers");
+ return null;
+ }
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ Type op_type = left.Type;
+ ILGenerator ig = ec.ig;
+
+ // It must be either array or fixed buffer
+ Type element = TypeManager.HasElementType (op_type) ?
+ element = TypeManager.GetElementType (op_type) :
+ element = AttributeTester.GetFixedBuffer (((FieldExpr)left).FieldInfo).ElementType;
+
+ int size = GetTypeSize (element);
+ Type rtype = right.Type;
+
+ if (rtype.IsPointer){
+ //
+ // handle (pointer - pointer)
+ //
+ left.Emit (ec);
+ right.Emit (ec);
+ ig.Emit (OpCodes.Sub);
+
+ if (size != 1){
+ if (size == 0)
+ ig.Emit (OpCodes.Sizeof, element);
+ else
+ IntLiteral.EmitInt (ig, size);
+ ig.Emit (OpCodes.Div);
+ }
+ ig.Emit (OpCodes.Conv_I8);
+ } else {
+ //
+ // handle + and - on (pointer op int)
+ //
+ left.Emit (ec);
+ ig.Emit (OpCodes.Conv_I);
+
+ Constant right_const = right as Constant;
+ if (right_const != null && size != 0) {
+ Expression ex = ConstantFold.BinaryFold (ec, Binary.Operator.Multiply, new IntConstant (size, right.Location), right_const, loc);
+ if (ex == null)
+ return;
+ ex.Emit (ec);
+ } else {
+ right.Emit (ec);
+ if (size != 1){
+ if (size == 0)
+ ig.Emit (OpCodes.Sizeof, element);
+ else
+ IntLiteral.EmitInt (ig, size);
+ if (rtype == TypeManager.int64_type)
+ ig.Emit (OpCodes.Conv_I8);
+ else if (rtype == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Conv_U8);
+ ig.Emit (OpCodes.Mul);
+ }
+ }
+
+ if (rtype == TypeManager.int64_type || rtype == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Conv_I);
+
+ if (is_add)
+ ig.Emit (OpCodes.Add);
+ else
+ ig.Emit (OpCodes.Sub);
+ }
+ }
+ }
+
+ /// <summary>
+ /// Implements the ternary conditional operator (?:)
+ /// </summary>
+ public class Conditional : Expression {
+ Expression expr, trueExpr, falseExpr;
+
+ public Conditional (Expression expr, Expression trueExpr, Expression falseExpr)
+ {
+ this.expr = expr;
+ this.trueExpr = trueExpr;
+ this.falseExpr = falseExpr;
+ this.loc = expr.Location;
+ }
+
+ public Expression Expr {
+ get {
+ return expr;
+ }
+ }
+
+ public Expression TrueExpr {
+ get {
+ return trueExpr;
+ }
+ }
+
+ public Expression FalseExpr {
+ get {
+ return falseExpr;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+
+ if (expr == null)
+ return null;
+
+#if GMCS_SOURCE
+ if (TypeManager.IsNullableValueType (expr.Type))
+ return new Nullable.LiftedConditional (expr, trueExpr, falseExpr, loc).Resolve (ec);
+#endif
+
+ if (expr.Type != TypeManager.bool_type){
+ expr = Expression.ResolveBoolean (
+ ec, expr, loc);
+
+ if (expr == null)
+ return null;
+ }
+
+ Assign ass = expr as Assign;
+ if (ass != null && ass.Source is Constant) {
+ Report.Warning (665, 3, loc, "Assignment in conditional expression is always constant; did you mean to use == instead of = ?");
+ }
+
+ trueExpr = trueExpr.Resolve (ec);
+ falseExpr = falseExpr.Resolve (ec);
+
+ if (trueExpr == null || falseExpr == null)
+ return null;
+
+ eclass = ExprClass.Value;
+ if (trueExpr.Type == falseExpr.Type) {
+ type = trueExpr.Type;
+ if (type == TypeManager.null_type) {
+ // TODO: probably will have to implement ConditionalConstant
+ // to call method without return constant as well
+ Report.Warning (-101, 1, loc, "Conditional expression will always return same value");
+ return trueExpr;
+ }
+ } else {
+ Expression conv;
+ Type true_type = trueExpr.Type;
+ Type false_type = falseExpr.Type;
+
+ //
+ // First, if an implicit conversion exists from trueExpr
+ // to falseExpr, then the result type is of type falseExpr.Type
+ //
+ conv = Convert.ImplicitConversion (ec, trueExpr, false_type, loc);
+ if (conv != null){
+ //
+ // Check if both can convert implicitl to each other's type
+ //
+ if (Convert.ImplicitConversion (ec, falseExpr, true_type, loc) != null){
+ Error (172,
+ "Can not compute type of conditional expression " +
+ "as `" + TypeManager.CSharpName (trueExpr.Type) +
+ "' and `" + TypeManager.CSharpName (falseExpr.Type) +
+ "' convert implicitly to each other");
+ return null;
+ }
+ type = false_type;
+ trueExpr = conv;
+ } else if ((conv = Convert.ImplicitConversion(ec, falseExpr, true_type,loc))!= null){
+ type = true_type;
+ falseExpr = conv;
+ } else {
+ Report.Error (173, loc, "Type of conditional expression cannot be determined because there is no implicit conversion between `{0}' and `{1}'",
+ trueExpr.GetSignatureForError (), falseExpr.GetSignatureForError ());
+ return null;
+ }
+ }
+
+ // Dead code optimalization
+ if (expr is BoolConstant){
+ BoolConstant bc = (BoolConstant) expr;
+
+ Report.Warning (429, 4, bc.Value ? falseExpr.Location : trueExpr.Location, "Unreachable expression code detected");
+ return bc.Value ? trueExpr : falseExpr;
+ }
+
+ return this;
+ }
+
+ public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
+ {
+ return null;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ Label false_target = ig.DefineLabel ();
+ Label end_target = ig.DefineLabel ();
+
+ expr.EmitBranchable (ec, false_target, false);
+ trueExpr.Emit (ec);
+ ig.Emit (OpCodes.Br, end_target);
+ ig.MarkLabel (false_target);
+ falseExpr.Emit (ec);
+ ig.MarkLabel (end_target);
+ }
+
+ }
+
+ public abstract class VariableReference : Expression, IAssignMethod, IMemoryLocation {
+ bool prepared;
+ LocalTemporary temp;
+
+ public abstract Variable Variable {
+ get;
+ }
+
+ public abstract bool IsRef {
+ get;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ Emit (ec, false);
+ }
+
+ //
+ // This method is used by parameters that are references, that are
+ // being passed as references: we only want to pass the pointer (that
+ // is already stored in the parameter, not the address of the pointer,
+ // and not the value of the variable).
+ //
+ public void EmitLoad (EmitContext ec)
+ {
+ Report.Debug (64, "VARIABLE EMIT LOAD", this, Variable, type, loc);
+ if (!prepared)
+ Variable.EmitInstance (ec);
+ Variable.Emit (ec);
+ }
+
+ public void Emit (EmitContext ec, bool leave_copy)
+ {
+ Report.Debug (64, "VARIABLE EMIT", this, Variable, type, IsRef, loc);
+
+ EmitLoad (ec);
+
+ if (IsRef) {
+ if (prepared)
+ ec.ig.Emit (OpCodes.Dup);
+
+ //
+ // If we are a reference, we loaded on the stack a pointer
+ // Now lets load the real value
+ //
+ LoadFromPtr (ec.ig, type);
+ }
+
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+
+ if (IsRef || Variable.NeedsTemporary) {
+ temp = new LocalTemporary (Type);
+ temp.Store (ec);
+ }
+ }
+ }
+
+ public void EmitAssign (EmitContext ec, Expression source, bool leave_copy,
+ bool prepare_for_load)
+ {
+ Report.Debug (64, "VARIABLE EMIT ASSIGN", this, Variable, type, IsRef,
+ source, loc);
+
+ ILGenerator ig = ec.ig;
+ prepared = prepare_for_load;
+
+ Variable.EmitInstance (ec);
+ if (prepare_for_load && Variable.HasInstance)
+ ig.Emit (OpCodes.Dup);
+ else if (IsRef && !prepared)
+ Variable.Emit (ec);
+
+ source.Emit (ec);
+
+ if (leave_copy) {
+ ig.Emit (OpCodes.Dup);
+ if (IsRef || Variable.NeedsTemporary) {
+ temp = new LocalTemporary (Type);
+ temp.Store (ec);
+ }
+ }
+
+ if (IsRef)
+ StoreFromPtr (ig, type);
+ else
+ Variable.EmitAssign (ec);
+
+ if (temp != null) {
+ temp.Emit (ec);
+ temp.Release (ec);
+ }
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp mode)
+ {
+ Variable.EmitInstance (ec);
+ Variable.EmitAddressOf (ec);
+ }
+ }
+
+ /// <summary>
+ /// Local variables
+ /// </summary>
+ public class LocalVariableReference : VariableReference, IVariable {
+ public readonly string Name;
+ public readonly Block Block;
+ public LocalInfo local_info;
+ bool is_readonly;
+ Variable variable;
+
+ public LocalVariableReference (Block block, string name, Location l)
+ {
+ Block = block;
+ Name = name;
+ loc = l;
+ eclass = ExprClass.Variable;
+ }
+
+ //
+ // Setting `is_readonly' to false will allow you to create a writable
+ // reference to a read-only variable. This is used by foreach and using.
+ //
+ public LocalVariableReference (Block block, string name, Location l,
+ LocalInfo local_info, bool is_readonly)
+ : this (block, name, l)
+ {
+ this.local_info = local_info;
+ this.is_readonly = is_readonly;
+ }
+
+ public VariableInfo VariableInfo {
+ get { return local_info.VariableInfo; }
+ }
+
+ public override bool IsRef {
+ get { return false; }
+ }
+
+ public bool IsReadOnly {
+ get { return is_readonly; }
+ }
+
+ public bool VerifyAssigned (EmitContext ec)
+ {
+ VariableInfo variable_info = local_info.VariableInfo;
+ return variable_info == null || variable_info.IsAssigned (ec, loc);
+ }
+
+ void ResolveLocalInfo ()
+ {
+ if (local_info == null) {
+ local_info = Block.GetLocalInfo (Name);
+ is_readonly = local_info.ReadOnly;
+ }
+ }
+
+ protected Expression DoResolveBase (EmitContext ec)
+ {
+ type = local_info.VariableType;
+
+ Expression e = Block.GetConstantExpression (Name);
+ if (e != null)
+ return e.Resolve (ec);
+
+ if (!VerifyAssigned (ec))
+ return null;
+
+ //
+ // If we are referencing a variable from the external block
+ // flag it for capturing
+ //
+ if (ec.MustCaptureVariable (local_info)) {
+ if (local_info.AddressTaken){
+ AnonymousMethod.Error_AddressOfCapturedVar (local_info.Name, loc);
+ return null;
+ }
+
+ ScopeInfo scope = local_info.Block.CreateScopeInfo ();
+ variable = scope.AddLocal (local_info);
+ type = variable.Type;
+ }
+
+ return this;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ ResolveLocalInfo ();
+ local_info.Used = true;
+ return DoResolveBase (ec);
+ }
+
+ override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ ResolveLocalInfo ();
+
+ if (is_readonly) {
+ int code;
+ string msg;
+ if (right_side == EmptyExpression.OutAccess) {
+ code = 1657; msg = "Cannot pass `{0}' as a ref or out argument because it is a `{1}'";
+ } else if (right_side == EmptyExpression.LValueMemberAccess) {
+ code = 1654; msg = "Cannot assign to members of `{0}' because it is a `{1}'";
+ } else if (right_side == EmptyExpression.LValueMemberOutAccess) {
+ code = 1655; msg = "Cannot pass members of `{0}' as ref or out arguments because it is a `{1}'";
+ } else {
+ code = 1656; msg = "Cannot assign to `{0}' because it is a `{1}'";
+ }
+ Report.Error (code, loc, msg, Name, local_info.GetReadOnlyContext ());
+ return null;
+ }
+
+ // is out param
+ if (right_side == EmptyExpression.OutAccess)
+ local_info.Used = true;
+
+ if (VariableInfo != null)
+ VariableInfo.SetAssigned (ec);
+
+ return DoResolveBase (ec);
+ }
+
+ public bool VerifyFixed ()
+ {
+ // A local Variable is always fixed.
+ return true;
+ }
+
+ public override int GetHashCode ()
+ {
+ return Name.GetHashCode ();
+ }
+
+ public override bool Equals (object obj)
+ {
+ LocalVariableReference lvr = obj as LocalVariableReference;
+ if (lvr == null)
+ return false;
+
+ return Name == lvr.Name && Block == lvr.Block;
+ }
+
+ public override Variable Variable {
+ get { return variable != null ? variable : local_info.Variable; }
+ }
+
+ public override string ToString ()
+ {
+ return String.Format ("{0} ({1}:{2})", GetType (), Name, loc);
+ }
+ }
+
+ /// <summary>
+ /// This represents a reference to a parameter in the intermediate
+ /// representation.
+ /// </summary>
+ public class ParameterReference : VariableReference, IVariable {
+ Parameter par;
+ string name;
+ int idx;
+ Block block;
+ VariableInfo vi;
+ public bool is_ref, is_out;
+
+ public bool IsOut {
+ get {
+ return is_out;
+ }
+ }
+
+ public override bool IsRef {
+ get {
+ return is_ref;
+ }
+ }
+
+ public string Name {
+ get {
+ return name;
+ }
+ }
+
+ public Parameter Parameter {
+ get {
+ return par;
+ }
+ }
+
+ Variable variable;
+
+ public ParameterReference (Parameter par, Block block, int idx, Location loc)
+ {
+ this.par = par;
+ this.name = par.Name;
+ this.block = block;
+ this.idx = idx;
+ this.loc = loc;
+ eclass = ExprClass.Variable;
+ }
+
+ public VariableInfo VariableInfo {
+ get { return vi; }
+ }
+
+ public override Variable Variable {
+ get { return variable != null ? variable : par.Variable; }
+ }
+
+ public bool VerifyFixed ()
+ {
+ // A parameter is fixed if it's a value parameter (i.e., no modifier like out, ref, param).
+ return par.ModFlags == Parameter.Modifier.NONE;
+ }
+
+ public bool IsAssigned (EmitContext ec, Location loc)
+ {
+ if (!ec.DoFlowAnalysis || !is_out || ec.CurrentBranching.IsAssigned (vi))
+ return true;
+
+ Report.Error (269, loc,
+ "Use of unassigned out parameter `{0}'", par.Name);
+ return false;
+ }
+
+ public bool IsFieldAssigned (EmitContext ec, string field_name, Location loc)
+ {
+ if (!ec.DoFlowAnalysis || !is_out || ec.CurrentBranching.IsFieldAssigned (vi, field_name))
+ return true;
+
+ Report.Error (170, loc,
+ "Use of possibly unassigned field `" + field_name + "'");
+ return false;
+ }
+
+ public void SetAssigned (EmitContext ec)
+ {
+ if (is_out && ec.DoFlowAnalysis)
+ ec.CurrentBranching.SetAssigned (vi);
+ }
+
+ public void SetFieldAssigned (EmitContext ec, string field_name)
+ {
+ if (is_out && ec.DoFlowAnalysis)
+ ec.CurrentBranching.SetFieldAssigned (vi, field_name);
+ }
+
+ protected bool DoResolveBase (EmitContext ec)
+ {
+ if (!par.Resolve (ec)) {
+ //TODO:
+ }
+
+ type = par.ParameterType;
+ Parameter.Modifier mod = par.ModFlags;
+ is_ref = (mod & Parameter.Modifier.ISBYREF) != 0;
+ is_out = (mod & Parameter.Modifier.OUT) == Parameter.Modifier.OUT;
+ eclass = ExprClass.Variable;
+
+ if (is_out)
+ vi = block.ParameterMap [idx];
+
+ AnonymousContainer am = ec.CurrentAnonymousMethod;
+ if (am == null)
+ return true;
+
+ if (is_ref && !block.Toplevel.IsLocalParameter (name)){
+ Report.Error (1628, Location,
+ "Cannot use ref or out parameter `{0}' inside an " +
+ "anonymous method block", par.Name);
+ return false;
+ }
+
+ if (!am.IsIterator && block.Toplevel.IsLocalParameter (name))
+ return true;
+
+ IAnonymousMethodHost host = null;
+ ToplevelBlock toplevel = block.Toplevel;
+ while (toplevel != null) {
+ if (toplevel.IsLocalParameter (name)) {
+ host = toplevel.AnonymousMethodHost;
+ break;
+ }
+
+ toplevel = toplevel.Container;
+ }
+
+ variable = host.AddParameter (par, idx);
+ type = variable.Type;
+ return true;
+ }
+
+ public override int GetHashCode()
+ {
+ return name.GetHashCode ();
+ }
+
+ public override bool Equals (object obj)
+ {
+ ParameterReference pr = obj as ParameterReference;
+ if (pr == null)
+ return false;
+
+ return name == pr.name && block == pr.block;
+ }
+
+ //
+ // Notice that for ref/out parameters, the type exposed is not the
+ // same type exposed externally.
+ //
+ // for "ref int a":
+ // externally we expose "int&"
+ // here we expose "int".
+ //
+ // We record this in "is_ref". This means that the type system can treat
+ // the type as it is expected, but when we generate the code, we generate
+ // the alternate kind of code.
+ //
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (!DoResolveBase (ec))
+ return null;
+
+ if (is_out && ec.DoFlowAnalysis &&
+ (!ec.OmitStructFlowAnalysis || !vi.TypeInfo.IsStruct) && !IsAssigned (ec, loc))
+ return null;
+
+ return this;
+ }
+
+ override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ if (!DoResolveBase (ec))
+ return null;
+
+ SetAssigned (ec);
+
+ return this;
+ }
+
+ static public void EmitLdArg (ILGenerator ig, int x)
+ {
+ if (x <= 255){
+ switch (x){
+ case 0: ig.Emit (OpCodes.Ldarg_0); break;
+ case 1: ig.Emit (OpCodes.Ldarg_1); break;
+ case 2: ig.Emit (OpCodes.Ldarg_2); break;
+ case 3: ig.Emit (OpCodes.Ldarg_3); break;
+ default: ig.Emit (OpCodes.Ldarg_S, (byte) x); break;
+ }
+ } else
+ ig.Emit (OpCodes.Ldarg, x);
+ }
+
+ public override string ToString ()
+ {
+ return "ParameterReference[" + name + "]";
+ }
+ }
+
+ /// <summary>
+ /// Used for arguments to New(), Invocation()
+ /// </summary>
+ public class Argument {
+ public enum AType : byte {
+ Expression,
+ Ref,
+ Out,
+ ArgList
+ };
+
+ public readonly AType ArgType;
+ public Expression Expr;
+
+ public Argument (Expression expr, AType type)
+ {
+ this.Expr = expr;
+ this.ArgType = type;
+ }
+
+ public Argument (Expression expr)
+ {
+ this.Expr = expr;
+ this.ArgType = AType.Expression;
+ }
+
+ public Type Type {
+ get {
+ if (ArgType == AType.Ref || ArgType == AType.Out)
+ return TypeManager.GetReferenceType (Expr.Type);
+ else
+ return Expr.Type;
+ }
+ }
+
+ public Parameter.Modifier Modifier
+ {
+ get {
+ switch (ArgType) {
+ case AType.Out:
+ return Parameter.Modifier.OUT;
+
+ case AType.Ref:
+ return Parameter.Modifier.REF;
+
+ default:
+ return Parameter.Modifier.NONE;
+ }
+ }
+ }
+
+ public static string FullDesc (Argument a)
+ {
+ if (a.ArgType == AType.ArgList)
+ return "__arglist";
+
+ return (a.ArgType == AType.Ref ? "ref " :
+ (a.ArgType == AType.Out ? "out " : "")) +
+ TypeManager.CSharpName (a.Expr.Type);
+ }
+
+ public bool ResolveMethodGroup (EmitContext ec)
+ {
+ SimpleName sn = Expr as SimpleName;
+ if (sn != null)
+ Expr = sn.GetMethodGroup ();
+
+ // FIXME: csc doesn't report any error if you try to use `ref' or
+ // `out' in a delegate creation expression.
+ Expr = Expr.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
+ if (Expr == null)
+ return false;
+
+ return true;
+ }
+
+ public bool Resolve (EmitContext ec, Location loc)
+ {
+ using (ec.With (EmitContext.Flags.DoFlowAnalysis, true)) {
+ // Verify that the argument is readable
+ if (ArgType != AType.Out)
+ Expr = Expr.Resolve (ec);
+
+ // Verify that the argument is writeable
+ if (Expr != null && (ArgType == AType.Out || ArgType == AType.Ref))
+ Expr = Expr.ResolveLValue (ec, EmptyExpression.OutAccess, loc);
+
+ return Expr != null;
+ }
+ }
+
+ public void Emit (EmitContext ec)
+ {
+ if (ArgType != AType.Ref && ArgType != AType.Out) {
+ Expr.Emit (ec);
+ return;
+ }
+
+ AddressOp mode = AddressOp.Store;
+ if (ArgType == AType.Ref)
+ mode |= AddressOp.Load;
+
+ IMemoryLocation ml = (IMemoryLocation) Expr;
+ ParameterReference pr = ml as ParameterReference;
+
+ //
+ // ParameterReferences might already be references, so we want
+ // to pass just the value
+ //
+ if (pr != null && pr.IsRef)
+ pr.EmitLoad (ec);
+ else
+ ml.AddressOf (ec, mode);
+ }
+ }
+
+ /// <summary>
+ /// Invocation of methods or delegates.
+ /// </summary>
+ public class Invocation : ExpressionStatement {
+ public readonly ArrayList Arguments;
+
+ Expression expr;
+ MethodBase method = null;
+
+ //
+ // arguments is an ArrayList, but we do not want to typecast,
+ // as it might be null.
+ //
+ // FIXME: only allow expr to be a method invocation or a
+ // delegate invocation (7.5.5)
+ //
+ public Invocation (Expression expr, ArrayList arguments)
+ {
+ this.expr = expr;
+ Arguments = arguments;
+ loc = expr.Location;
+ }
+
+ public Expression Expr {
+ get {
+ return expr;
+ }
+ }
+
+ /// <summary>
+ /// Determines "better conversion" as specified in 14.4.2.3
+ ///
+ /// Returns : p if a->p is better,
+ /// q if a->q is better,
+ /// null if neither is better
+ /// </summary>
+ static Type BetterConversion (EmitContext ec, Argument a, Type p, Type q)
+ {
+ Type argument_type = TypeManager.TypeToCoreType (a.Type);
+ Expression argument_expr = a.Expr;
+
+ if (argument_type == null)
+ throw new Exception ("Expression of type " + a.Expr +
+ " does not resolve its type");
+
+ if (p == null || q == null)
+ throw new InternalErrorException ("BetterConversion Got a null conversion");
+
+ if (p == q)
+ return null;
+
+ if (argument_expr is NullLiteral) {
+ //
+ // If the argument is null and one of the types to compare is 'object' and
+ // the other is a reference type, we prefer the other.
+ //
+ // This follows from the usual rules:
+ // * There is an implicit conversion from 'null' to type 'object'
+ // * There is an implicit conversion from 'null' to any reference type
+ // * There is an implicit conversion from any reference type to type 'object'
+ // * There is no implicit conversion from type 'object' to other reference types
+ // => Conversion of 'null' to a reference type is better than conversion to 'object'
+ //
+ // FIXME: This probably isn't necessary, since the type of a NullLiteral is the
+ // null type. I think it used to be 'object' and thus needed a special
+ // case to avoid the immediately following two checks.
+ //
+ if (!p.IsValueType && q == TypeManager.object_type)
+ return p;
+ if (!q.IsValueType && p == TypeManager.object_type)
+ return q;
+ }
+
+ if (argument_type == p)
+ return p;
+
+ if (argument_type == q)
+ return q;
+
+ Expression p_tmp = new EmptyExpression (p);
+ Expression q_tmp = new EmptyExpression (q);
+
+ bool p_to_q = Convert.ImplicitConversionExists (ec, p_tmp, q);
+ bool q_to_p = Convert.ImplicitConversionExists (ec, q_tmp, p);
+
+ if (p_to_q && !q_to_p)
+ return p;
+
+ if (q_to_p && !p_to_q)
+ return q;
+
+ if (p == TypeManager.sbyte_type)
+ if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
+ q == TypeManager.uint32_type || q == TypeManager.uint64_type)
+ return p;
+ if (q == TypeManager.sbyte_type)
+ if (p == TypeManager.byte_type || p == TypeManager.ushort_type ||
+ p == TypeManager.uint32_type || p == TypeManager.uint64_type)
+ return q;
+
+ if (p == TypeManager.short_type)
+ if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
+ q == TypeManager.uint64_type)
+ return p;
+ if (q == TypeManager.short_type)
+ if (p == TypeManager.ushort_type || p == TypeManager.uint32_type ||
+ p == TypeManager.uint64_type)
+ return q;
+
+ if (p == TypeManager.int32_type)
+ if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
+ return p;
+ if (q == TypeManager.int32_type)
+ if (p == TypeManager.uint32_type || p == TypeManager.uint64_type)
+ return q;
+
+ if (p == TypeManager.int64_type)
+ if (q == TypeManager.uint64_type)
+ return p;
+ if (q == TypeManager.int64_type)
+ if (p == TypeManager.uint64_type)
+ return q;
+
+ return null;
+ }
+
+ static Type MoreSpecific (Type p, Type q)
+ {
+ if (TypeManager.IsGenericParameter (p) && !TypeManager.IsGenericParameter (q))
+ return q;
+ if (!TypeManager.IsGenericParameter (p) && TypeManager.IsGenericParameter (q))
+ return p;
+
+ if (TypeManager.HasElementType (p)) {
+ Type pe = TypeManager.GetElementType (p);
+ Type qe = TypeManager.GetElementType (q);
+ Type specific = MoreSpecific (pe, qe);
+ if (specific == pe)
+ return p;
+ if (specific == qe)
+ return q;
+ } else if (TypeManager.IsGenericType (p)) {
+ Type[] pargs = TypeManager.GetTypeArguments (p);
+ Type[] qargs = TypeManager.GetTypeArguments (q);
+
+ bool p_specific_at_least_once = false;
+ bool q_specific_at_least_once = false;
+
+ for (int i = 0; i < pargs.Length; i++) {
+ Type specific = MoreSpecific (pargs [i], qargs [i]);
+ if (specific == pargs [i])
+ p_specific_at_least_once = true;
+ if (specific == qargs [i])
+ q_specific_at_least_once = true;
+ }
+
+ if (p_specific_at_least_once && !q_specific_at_least_once)
+ return p;
+ if (!p_specific_at_least_once && q_specific_at_least_once)
+ return q;
+ }
+
+ return null;
+ }
+
+ /// <summary>
+ /// Determines "Better function" between candidate
+ /// and the current best match
+ /// </summary>
+ /// <remarks>
+ /// Returns a boolean indicating :
+ /// false if candidate ain't better
+ /// true if candidate is better than the current best match
+ /// </remarks>
+ static bool BetterFunction (EmitContext ec, ArrayList args, int argument_count,
+ MethodBase candidate, bool candidate_params,
+ MethodBase best, bool best_params)
+ {
+ ParameterData candidate_pd = TypeManager.GetParameterData (candidate);
+ ParameterData best_pd = TypeManager.GetParameterData (best);
+
+ bool better_at_least_one = false;
+ bool same = true;
+ for (int j = 0; j < argument_count; ++j) {
+ Argument a = (Argument) args [j];
+
+ Type ct = TypeManager.TypeToCoreType (candidate_pd.ParameterType (j));
+ Type bt = TypeManager.TypeToCoreType (best_pd.ParameterType (j));
+
+ if (candidate_pd.ParameterModifier (j) == Parameter.Modifier.PARAMS)
+ if (candidate_params)
+ ct = TypeManager.GetElementType (ct);
+
+ if (best_pd.ParameterModifier (j) == Parameter.Modifier.PARAMS)
+ if (best_params)
+ bt = TypeManager.GetElementType (bt);
+
+ if (ct.Equals (bt))
+ continue;
+
+ same = false;
+ Type better = BetterConversion (ec, a, ct, bt);
+
+ // for each argument, the conversion to 'ct' should be no worse than
+ // the conversion to 'bt'.
+ if (better == bt)
+ return false;
+
+ // for at least one argument, the conversion to 'ct' should be better than
+ // the conversion to 'bt'.
+ if (better == ct)
+ better_at_least_one = true;
+ }
+
+ if (better_at_least_one)
+ return true;
+
+ //
+ // This handles the case
+ //
+ // Add (float f1, float f2, float f3);
+ // Add (params decimal [] foo);
+ //
+ // The call Add (3, 4, 5) should be ambiguous. Without this check, the
+ // first candidate would've chosen as better.
+ //
+ if (!same)
+ return false;
+
+ //
+ // The two methods have equal parameter types. Now apply tie-breaking rules
+ //
+ if (TypeManager.IsGenericMethod (best) && !TypeManager.IsGenericMethod (candidate))
+ return true;
+ if (!TypeManager.IsGenericMethod (best) && TypeManager.IsGenericMethod (candidate))
+ return false;
+
+ //
+ // This handles the following cases:
+ //
+ // Trim () is better than Trim (params char[] chars)
+ // Concat (string s1, string s2, string s3) is better than
+ // Concat (string s1, params string [] srest)
+ // Foo (int, params int [] rest) is better than Foo (params int [] rest)
+ //
+ if (!candidate_params && best_params)
+ return true;
+ if (candidate_params && !best_params)
+ return false;
+
+ int candidate_param_count = candidate_pd.Count;
+ int best_param_count = best_pd.Count;
+
+ if (candidate_param_count != best_param_count)
+ // can only happen if (candidate_params && best_params)
+ return candidate_param_count > best_param_count;
+
+ //
+ // now, both methods have the same number of parameters, and the parameters have the same types
+ // Pick the "more specific" signature
+ //
+
+ MethodBase orig_candidate = TypeManager.DropGenericMethodArguments (candidate);
+ MethodBase orig_best = TypeManager.DropGenericMethodArguments (best);
+
+ ParameterData orig_candidate_pd = TypeManager.GetParameterData (orig_candidate);
+ ParameterData orig_best_pd = TypeManager.GetParameterData (orig_best);
+
+ bool specific_at_least_once = false;
+ for (int j = 0; j < candidate_param_count; ++j) {
+ Type ct = TypeManager.TypeToCoreType (orig_candidate_pd.ParameterType (j));
+ Type bt = TypeManager.TypeToCoreType (orig_best_pd.ParameterType (j));
+ if (ct.Equals (bt))
+ continue;
+ Type specific = MoreSpecific (ct, bt);
+ if (specific == bt)
+ return false;
+ if (specific == ct)
+ specific_at_least_once = true;
+ }
+
+ if (specific_at_least_once)
+ return true;
+
+ // FIXME: handle lifted operators
+ // ...
+
+ return false;
+ }
+
+ internal static bool IsOverride (MethodBase cand_method, MethodBase base_method)
+ {
+ if (!IsAncestralType (base_method.DeclaringType, cand_method.DeclaringType))
+ return false;
+
+ ParameterData cand_pd = TypeManager.GetParameterData (cand_method);
+ ParameterData base_pd = TypeManager.GetParameterData (base_method);
+
+ if (cand_pd.Count != base_pd.Count)
+ return false;
+
+ for (int j = 0; j < cand_pd.Count; ++j) {
+ Parameter.Modifier cm = cand_pd.ParameterModifier (j);
+ Parameter.Modifier bm = base_pd.ParameterModifier (j);
+ Type ct = TypeManager.TypeToCoreType (cand_pd.ParameterType (j));
+ Type bt = TypeManager.TypeToCoreType (base_pd.ParameterType (j));
+
+ if (cm != bm || ct != bt)
+ return false;
+ }
+
+ return true;
+ }
+
+ public static string FullMethodDesc (MethodBase mb)
+ {
+ if (mb == null)
+ return "";
+
+ StringBuilder sb;
+ if (mb is MethodInfo) {
+ sb = new StringBuilder (TypeManager.CSharpName (((MethodInfo) mb).ReturnType));
+ sb.Append (" ");
+ }
+ else
+ sb = new StringBuilder ();
+
+ sb.Append (TypeManager.CSharpSignature (mb));
+ return sb.ToString ();
+ }
+
+ public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2, Location loc)
+ {
+ MemberInfo [] miset;
+ MethodGroupExpr union;
+
+ if (mg1 == null) {
+ if (mg2 == null)
+ return null;
+ return (MethodGroupExpr) mg2;
+ } else {
+ if (mg2 == null)
+ return (MethodGroupExpr) mg1;
+ }
+
+ MethodGroupExpr left_set = null, right_set = null;
+ int length1 = 0, length2 = 0;
+
+ left_set = (MethodGroupExpr) mg1;
+ length1 = left_set.Methods.Length;
+
+ right_set = (MethodGroupExpr) mg2;
+ length2 = right_set.Methods.Length;
+
+ ArrayList common = new ArrayList ();
+
+ foreach (MethodBase r in right_set.Methods){
+ if (TypeManager.ArrayContainsMethod (left_set.Methods, r))
+ common.Add (r);
+ }
+
+ miset = new MemberInfo [length1 + length2 - common.Count];
+ left_set.Methods.CopyTo (miset, 0);
+
+ int k = length1;
+
+ foreach (MethodBase r in right_set.Methods) {
+ if (!common.Contains (r))
+ miset [k++] = r;
+ }
+
+ union = new MethodGroupExpr (miset, loc);
+
+ return union;
+ }
+
+ public static bool IsParamsMethodApplicable (EmitContext ec, MethodGroupExpr me,
+ ArrayList arguments, int arg_count,
+ ref MethodBase candidate)
+ {
+ return IsParamsMethodApplicable (
+ ec, me, arguments, arg_count, false, ref candidate) ||
+ IsParamsMethodApplicable (
+ ec, me, arguments, arg_count, true, ref candidate);
+
+
+ }
+
+ static bool IsParamsMethodApplicable (EmitContext ec, MethodGroupExpr me,
+ ArrayList arguments, int arg_count,
+ bool do_varargs, ref MethodBase candidate)
+ {
+#if GMCS_SOURCE
+ if (!me.HasTypeArguments &&
+ !TypeManager.InferParamsTypeArguments (ec, arguments, ref candidate))
+ return false;
+
+ if (TypeManager.IsGenericMethodDefinition (candidate))
+ throw new InternalErrorException ("a generic method definition took part in overload resolution");
+#endif
+
+ return IsParamsMethodApplicable (
+ ec, arguments, arg_count, candidate, do_varargs);
+ }
+
+ /// <summary>
+ /// Determines if the candidate method, if a params method, is applicable
+ /// in its expanded form to the given set of arguments
+ /// </summary>
+ static bool IsParamsMethodApplicable (EmitContext ec, ArrayList arguments,
+ int arg_count, MethodBase candidate,
+ bool do_varargs)
+ {
+ ParameterData pd = TypeManager.GetParameterData (candidate);
+
+ int pd_count = pd.Count;
+ if (pd_count == 0)
+ return false;
+
+ int count = pd_count - 1;
+ if (do_varargs) {
+ if (pd.ParameterModifier (count) != Parameter.Modifier.ARGLIST)
+ return false;
+ if (pd_count != arg_count)
+ return false;
+ } else {
+ if (!pd.HasParams)
+ return false;
+ }
+
+ if (count > arg_count)
+ return false;
+
+ if (pd_count == 1 && arg_count == 0)
+ return true;
+
+ //
+ // If we have come this far, the case which
+ // remains is when the number of parameters is
+ // less than or equal to the argument count.
+ //
+ for (int i = 0; i < count; ++i) {
+
+ Argument a = (Argument) arguments [i];
+
+ Parameter.Modifier a_mod = a.Modifier &
+ (unchecked (~(Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK)));
+ Parameter.Modifier p_mod = pd.ParameterModifier (i) &
+ (unchecked (~(Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK)));
+
+ if (a_mod == p_mod) {
+
+ if (a_mod == Parameter.Modifier.NONE)
+ if (!Convert.ImplicitConversionExists (ec,
+ a.Expr,
+ pd.ParameterType (i)))
+ return false;
+
+ if ((a_mod & Parameter.Modifier.ISBYREF) != 0) {
+ Type pt = pd.ParameterType (i);
+
+ if (!pt.IsByRef)
+ pt = TypeManager.GetReferenceType (pt);
+
+ if (pt != a.Type)
+ return false;
+ }
+ } else
+ return false;
+
+ }
+
+ if (do_varargs) {
+ Argument a = (Argument) arguments [count];
+ if (!(a.Expr is Arglist))
+ return false;
+
+ return true;
+ }
+
+ Type element_type = TypeManager.GetElementType (pd.ParameterType (pd_count - 1));
+
+ for (int i = pd_count - 1; i < arg_count; i++) {
+ Argument a = (Argument) arguments [i];
+
+ if (!Convert.ImplicitConversionExists (ec, a.Expr, element_type))
+ return false;
+ }
+
+ return true;
+ }
+
+ public static bool IsApplicable (EmitContext ec, MethodGroupExpr me,
+ ArrayList arguments, int arg_count,
+ ref MethodBase candidate)
+ {
+#if GMCS_SOURCE
+ if (!me.HasTypeArguments &&
+ !TypeManager.InferTypeArguments (arguments, ref candidate))
+ return false;
+
+ if (TypeManager.IsGenericMethodDefinition (candidate))
+ throw new InternalErrorException ("a generic method definition took part in overload resolution");
+#endif
+
+ return IsApplicable (ec, arguments, arg_count, candidate);
+ }
+
+ /// <summary>
+ /// Determines if the candidate method is applicable (section 14.4.2.1)
+ /// to the given set of arguments
+ /// </summary>
+ public static bool IsApplicable (EmitContext ec, ArrayList arguments, int arg_count,
+ MethodBase candidate)
+ {
+ ParameterData pd = TypeManager.GetParameterData (candidate);
+
+ if (arg_count != pd.Count)
+ return false;
+
+ for (int i = arg_count; i > 0; ) {
+ i--;
+
+ Argument a = (Argument) arguments [i];
+
+ Parameter.Modifier a_mod = a.Modifier &
+ ~(Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
+
+ Parameter.Modifier p_mod = pd.ParameterModifier (i) &
+ ~(Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK | Parameter.Modifier.PARAMS);
+
+ if (a_mod == p_mod) {
+ Type pt = pd.ParameterType (i);
+
+ if (a_mod == Parameter.Modifier.NONE) {
+ if (!TypeManager.IsEqual (a.Type, pt) &&
+ !Convert.ImplicitConversionExists (ec, a.Expr, pt))
+ return false;
+ continue;
+ }
+
+ if (pt != a.Type)
+ return false;
+ } else
+ return false;
+ }
+
+ return true;
+ }
+
+ static internal bool IsAncestralType (Type first_type, Type second_type)
+ {
+ return first_type != second_type &&
+ (TypeManager.IsSubclassOf (second_type, first_type) ||
+ TypeManager.ImplementsInterface (second_type, first_type));
+ }
+
+ /// <summary>
+ /// Find the Applicable Function Members (7.4.2.1)
+ ///
+ /// me: Method Group expression with the members to select.
+ /// it might contain constructors or methods (or anything
+ /// that maps to a method).
+ ///
+ /// Arguments: ArrayList containing resolved Argument objects.
+ ///
+ /// loc: The location if we want an error to be reported, or a Null
+ /// location for "probing" purposes.
+ ///
+ /// Returns: The MethodBase (either a ConstructorInfo or a MethodInfo)
+ /// that is the best match of me on Arguments.
+ ///
+ /// </summary>
+ public static MethodBase OverloadResolve (EmitContext ec, MethodGroupExpr me,
+ ArrayList Arguments, bool may_fail,
+ Location loc)
+ {
+ MethodBase method = null;
+ bool method_params = false;
+ Type applicable_type = null;
+ int arg_count = 0;
+ ArrayList candidates = new ArrayList (2);
+ ArrayList candidate_overrides = null;
+
+ //
+ // Used to keep a map between the candidate
+ // and whether it is being considered in its
+ // normal or expanded form
+ //
+ // false is normal form, true is expanded form
+ //
+ Hashtable candidate_to_form = null;
+
+ if (Arguments != null)
+ arg_count = Arguments.Count;
+
+ if ((me.Name == "Invoke") &&
+ TypeManager.IsDelegateType (me.DeclaringType)) {
+ Error_InvokeOnDelegate (loc);
+ return null;
+ }
+
+ MethodBase[] methods = me.Methods;
+
+ int nmethods = methods.Length;
+
+ if (!me.IsBase) {
+ //
+ // Methods marked 'override' don't take part in 'applicable_type'
+ // computation, nor in the actual overload resolution.
+ // However, they still need to be emitted instead of a base virtual method.
+ // So, we salt them away into the 'candidate_overrides' array.
+ //
+ // In case of reflected methods, we replace each overriding method with
+ // its corresponding base virtual method. This is to improve compatibility
+ // with non-C# libraries which change the visibility of overrides (#75636)
+ //
+ int j = 0;
+ for (int i = 0; i < methods.Length; ++i) {
+ MethodBase m = methods [i];
+#if GMCS_SOURCE
+ Type [] gen_args = null;
+ if (m.IsGenericMethod && !m.IsGenericMethodDefinition)
+ gen_args = m.GetGenericArguments ();
+#endif
+ if (TypeManager.IsOverride (m)) {
+ if (candidate_overrides == null)
+ candidate_overrides = new ArrayList ();
+ candidate_overrides.Add (m);
+ m = TypeManager.TryGetBaseDefinition (m);
+#if GMCS_SOURCE
+ if (m != null && gen_args != null) {
+ if (!m.IsGenericMethodDefinition)
+ throw new InternalErrorException ("GetBaseDefinition didn't return a GenericMethodDefinition");
+ m = ((MethodInfo) m).MakeGenericMethod (gen_args);
+ }
+#endif
+ }
+ if (m != null)
+ methods [j++] = m;
+ }
+ nmethods = j;
+ }
+
+ int applicable_errors = Report.Errors;
+
+ //
+ // First we construct the set of applicable methods
+ //
+ bool is_sorted = true;
+ for (int i = 0; i < nmethods; i++){
+ Type decl_type = methods [i].DeclaringType;
+
+ //
+ // If we have already found an applicable method
+ // we eliminate all base types (Section 14.5.5.1)
+ //
+ if (applicable_type != null && IsAncestralType (decl_type, applicable_type))
+ continue;
+
+ //
+ // Check if candidate is applicable (section 14.4.2.1)
+ // Is candidate applicable in normal form?
+ //
+ bool is_applicable = IsApplicable (ec, me, Arguments, arg_count, ref methods [i]);
+
+ if (!is_applicable && IsParamsMethodApplicable (ec, me, Arguments, arg_count, ref methods [i])) {
+ MethodBase candidate = methods [i];
+ if (candidate_to_form == null)
+ candidate_to_form = new PtrHashtable ();
+ candidate_to_form [candidate] = candidate;
+ // Candidate is applicable in expanded form
+ is_applicable = true;
+ }
+
+ if (!is_applicable)
+ continue;
+
+ candidates.Add (methods [i]);
+
+ if (applicable_type == null)
+ applicable_type = decl_type;
+ else if (applicable_type != decl_type) {
+ is_sorted = false;
+ if (IsAncestralType (applicable_type, decl_type))
+ applicable_type = decl_type;
+ }
+ }
+
+ if (applicable_errors != Report.Errors)
+ return null;
+
+ int candidate_top = candidates.Count;
+
+ if (applicable_type == null) {
+ //
+ // Okay so we have failed to find anything so we
+ // return by providing info about the closest match
+ //
+ int errors = Report.Errors;
+ for (int i = 0; i < nmethods; ++i) {
+ MethodBase c = (MethodBase) methods [i];
+ ParameterData pd = TypeManager.GetParameterData (c);
+
+ if (pd.Count != arg_count)
+ continue;
+
+#if GMCS_SOURCE
+ if (!TypeManager.InferTypeArguments (Arguments, ref c))
+ continue;
+ if (TypeManager.IsGenericMethodDefinition (c))
+ continue;
+#endif
+
+ VerifyArgumentsCompat (ec, Arguments, arg_count,
+ c, false, null, may_fail, loc);
+
+ if (!may_fail && errors == Report.Errors)
+ throw new InternalErrorException (
+ "VerifyArgumentsCompat and IsApplicable do not agree; " +
+ "likely reason: ImplicitConversion and ImplicitConversionExists have gone out of sync");
+
+ break;
+ }
+
+ if (!may_fail && errors == Report.Errors) {
+ string report_name = me.Name;
+ if (report_name == ".ctor")
+ report_name = TypeManager.CSharpName (me.DeclaringType);
+
+#if GMCS_SOURCE
+ //
+ // Type inference
+ //
+ for (int i = 0; i < methods.Length; ++i) {
+ MethodBase c = methods [i];
+ ParameterData pd = TypeManager.GetParameterData (c);
+
+ if (pd.Count != arg_count)
+ continue;
+
+ if (TypeManager.InferTypeArguments (Arguments, ref c))
+ continue;
+
+ Report.Error (
+ 411, loc, "The type arguments for " +
+ "method `{0}' cannot be infered from " +
+ "the usage. Try specifying the type " +
+ "arguments explicitly.", report_name);
+ return null;
+ }
+#endif
+
+ Error_WrongNumArguments (loc, report_name, arg_count);
+ }
+
+ return null;
+ }
+
+ if (!is_sorted) {
+ //
+ // At this point, applicable_type is _one_ of the most derived types
+ // in the set of types containing the methods in this MethodGroup.
+ // Filter the candidates so that they only contain methods from the
+ // most derived types.
+ //
+
+ int finalized = 0; // Number of finalized candidates
+
+ do {
+ // Invariant: applicable_type is a most derived type
+
+ // We'll try to complete Section 14.5.5.1 for 'applicable_type' by
+ // eliminating all it's base types. At the same time, we'll also move
+ // every unrelated type to the end of the array, and pick the next
+ // 'applicable_type'.
+
+ Type next_applicable_type = null;
+ int j = finalized; // where to put the next finalized candidate
+ int k = finalized; // where to put the next undiscarded candidate
+ for (int i = finalized; i < candidate_top; ++i) {
+ MethodBase candidate = (MethodBase) candidates [i];
+ Type decl_type = candidate.DeclaringType;
+
+ if (decl_type == applicable_type) {
+ candidates [k++] = candidates [j];
+ candidates [j++] = candidates [i];
+ continue;
+ }
+
+ if (IsAncestralType (decl_type, applicable_type))
+ continue;
+
+ if (next_applicable_type != null &&
+ IsAncestralType (decl_type, next_applicable_type))
+ continue;
+
+ candidates [k++] = candidates [i];
+
+ if (next_applicable_type == null ||
+ IsAncestralType (next_applicable_type, decl_type))
+ next_applicable_type = decl_type;
+ }
+
+ applicable_type = next_applicable_type;
+ finalized = j;
+ candidate_top = k;
+ } while (applicable_type != null);
+ }
+
+ //
+ // Now we actually find the best method
+ //
+
+ method = (MethodBase) candidates [0];
+ method_params = candidate_to_form != null && candidate_to_form.Contains (method);
+ for (int ix = 1; ix < candidate_top; ix++){
+ MethodBase candidate = (MethodBase) candidates [ix];
+
+ if (candidate == method)
+ continue;
+
+ bool cand_params = candidate_to_form != null && candidate_to_form.Contains (candidate);
+
+ if (BetterFunction (ec, Arguments, arg_count,
+ candidate, cand_params,
+ method, method_params)) {
+ method = candidate;
+ method_params = cand_params;
+ }
+ }
+ //
+ // Now check that there are no ambiguities i.e the selected method
+ // should be better than all the others
+ //
+ MethodBase ambiguous = null;
+ for (int ix = 0; ix < candidate_top; ix++){
+ MethodBase candidate = (MethodBase) candidates [ix];
+
+ if (candidate == method)
+ continue;
+
+ bool cand_params = candidate_to_form != null && candidate_to_form.Contains (candidate);
+ if (!BetterFunction (ec, Arguments, arg_count,
+ method, method_params,
+ candidate, cand_params)) {
+ Report.SymbolRelatedToPreviousError (candidate);
+ ambiguous = candidate;
+ }
+ }
+
+ if (ambiguous != null) {
+ Report.SymbolRelatedToPreviousError (method);
+ Report.Error (121, loc, "The call is ambiguous between the following methods or properties: `{0}' and `{1}'",
+ TypeManager.CSharpSignature (ambiguous), TypeManager.CSharpSignature (method));
+ return null;
+ }
+
+ //
+ // If the method is a virtual function, pick an override closer to the LHS type.
+ //
+ if (!me.IsBase && method.IsVirtual) {
+ if (TypeManager.IsOverride (method))
+ throw new InternalErrorException (
+ "Should not happen. An 'override' method took part in overload resolution: " + method);
+
+ if (candidate_overrides != null)
+ foreach (MethodBase candidate in candidate_overrides) {
+ if (IsOverride (candidate, method))
+ method = candidate;
+ }
+ }
+
+ //
+ // And now check if the arguments are all
+ // compatible, perform conversions if
+ // necessary etc. and return if everything is
+ // all right
+ //
+ if (!VerifyArgumentsCompat (ec, Arguments, arg_count, method,
+ method_params, null, may_fail, loc))
+ return null;
+
+ if (method == null)
+ return null;
+
+ MethodBase the_method = TypeManager.DropGenericMethodArguments (method);
+#if GMCS_SOURCE
+ if (the_method.IsGenericMethodDefinition &&
+ !ConstraintChecker.CheckConstraints (ec, the_method, method, loc))
+ return null;
+#endif
+
+ IMethodData data = TypeManager.GetMethod (the_method);
+ if (data != null)
+ data.SetMemberIsUsed ();
+
+ return method;
+ }
+
+ public static void Error_WrongNumArguments (Location loc, String name, int arg_count)
+ {
+ Report.Error (1501, loc, "No overload for method `{0}' takes `{1}' arguments",
+ name, arg_count.ToString ());
+ }
+
+ static void Error_InvokeOnDelegate (Location loc)
+ {
+ Report.Error (1533, loc,
+ "Invoke cannot be called directly on a delegate");
+ }
+
+ static void Error_InvalidArguments (Location loc, int idx, MethodBase method,
+ Type delegate_type, Argument a, ParameterData expected_par)
+ {
+ if (delegate_type == null)
+ Report.Error (1502, loc, "The best overloaded method match for `{0}' has some invalid arguments",
+ TypeManager.CSharpSignature (method));
+ else
+ Report.Error (1594, loc, "Delegate `{0}' has some invalid arguments",
+ TypeManager.CSharpName (delegate_type));
+
+ Parameter.Modifier mod = expected_par.ParameterModifier (idx);
+
+ string index = (idx + 1).ToString ();
+ if (mod != Parameter.Modifier.ARGLIST && mod != a.Modifier) {
+ if ((mod & (Parameter.Modifier.REF | Parameter.Modifier.OUT)) == 0)
+ Report.Error (1615, loc, "Argument `{0}' should not be passed with the `{1}' keyword",
+ index, Parameter.GetModifierSignature (a.Modifier));
+ else
+ Report.Error (1620, loc, "Argument `{0}' must be passed with the `{1}' keyword",
+ index, Parameter.GetModifierSignature (mod));
+ } else {
+ Report.Error (1503, loc, "Argument {0}: Cannot convert from `{1}' to `{2}'",
+ index, Argument.FullDesc (a), expected_par.ParameterDesc (idx));
+ }
+ }
+
+ public static bool VerifyArgumentsCompat (EmitContext ec, ArrayList Arguments,
+ int arg_count, MethodBase method,
+ bool chose_params_expanded,
+ Type delegate_type, bool may_fail,
+ Location loc)
+ {
+ ParameterData pd = TypeManager.GetParameterData (method);
+ int j;
+ for (j = 0; j < arg_count; j++) {
+ Argument a = (Argument) Arguments [j];
+ Expression a_expr = a.Expr;
+ Type parameter_type = pd.ParameterType (j);
+ Parameter.Modifier pm = pd.ParameterModifier (j);
+ Parameter.Modifier am = a.Modifier;
+
+ if (pm == Parameter.Modifier.ARGLIST) {
+ if (!(a.Expr is Arglist))
+ break;
+ continue;
+ }
+
+ if (pm == Parameter.Modifier.PARAMS) {
+ pm = Parameter.Modifier.NONE;
+ if (chose_params_expanded)
+ parameter_type = TypeManager.GetElementType (parameter_type);
+ }
+
+ if (pm != am)
+ break;
+
+ if (!TypeManager.IsEqual (a.Type, parameter_type)) {
+ if (pm == Parameter.Modifier.OUT || pm == Parameter.Modifier.REF)
+ break;
+
+ Expression conv = Convert.ImplicitConversion (ec, a_expr, parameter_type, loc);
+ if (conv == null)
+ break;
+
+ // Update the argument with the implicit conversion
+ if (a_expr != conv)
+ a.Expr = conv;
+ }
+
+ if (parameter_type.IsPointer && !ec.InUnsafe) {
+ UnsafeError (loc);
+ return false;
+ }
+ }
+
+ if (j == arg_count)
+ return true;
+
+ if (!may_fail)
+ Error_InvalidArguments (loc, j, method, delegate_type, (Argument) Arguments [j], pd);
+ return false;
+ }
+
+ private bool resolved = false;
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (resolved)
+ return this.method == null ? null : this;
+
+ resolved = true;
+ //
+ // First, resolve the expression that is used to
+ // trigger the invocation
+ //
+ SimpleName sn = expr as SimpleName;
+ if (sn != null)
+ expr = sn.GetMethodGroup ();
+
+ expr = expr.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
+ if (expr == null)
+ return null;
+
+ if (!(expr is MethodGroupExpr)) {
+ Type expr_type = expr.Type;
+
+ if (expr_type != null){
+ bool IsDelegate = TypeManager.IsDelegateType (expr_type);
+ if (IsDelegate)
+ return (new DelegateInvocation (
+ this.expr, Arguments, loc)).Resolve (ec);
+ }
+ }
+
+ if (!(expr is MethodGroupExpr)){
+ expr.Error_UnexpectedKind (ResolveFlags.MethodGroup, loc);
+ return null;
+ }
+
+ //
+ // Next, evaluate all the expressions in the argument list
+ //
+ if (Arguments != null){
+ foreach (Argument a in Arguments){
+ if (!a.Resolve (ec, loc))
+ return null;
+ }
+ }
+
+ MethodGroupExpr mg = (MethodGroupExpr) expr;
+ MethodBase method = OverloadResolve (ec, mg, Arguments, false, loc);
+
+ if (method == null)
+ return null;
+
+ MethodInfo mi = method as MethodInfo;
+ if (mi != null) {
+ type = TypeManager.TypeToCoreType (mi.ReturnType);
+ Expression iexpr = mg.InstanceExpression;
+ if (mi.IsStatic) {
+ if (iexpr == null ||
+ iexpr is This || iexpr is EmptyExpression ||
+ mg.IdenticalTypeName) {
+ mg.InstanceExpression = null;
+ } else {
+ MemberExpr.error176 (loc, TypeManager.CSharpSignature (mi));
+ return null;
+ }
+ } else {
+ if (iexpr == null || iexpr is EmptyExpression) {
+ SimpleName.Error_ObjectRefRequired (ec, loc, TypeManager.CSharpSignature (mi));
+ return null;
+ }
+ }
+ }
+
+ if (type.IsPointer){
+ if (!ec.InUnsafe){
+ UnsafeError (loc);
+ return null;
+ }
+ }
+
+ //
+ // Only base will allow this invocation to happen.
+ //
+ if (mg.IsBase && method.IsAbstract){
+ Error_CannotCallAbstractBase (TypeManager.CSharpSignature (method));
+ return null;
+ }
+
+ if (Arguments == null && method.Name == "Finalize") {
+ if (mg.IsBase)
+ Report.Error (250, loc, "Do not directly call your base class Finalize method. It is called automatically from your destructor");
+ else
+ Report.Error (245, loc, "Destructors and object.Finalize cannot be called directly. Consider calling IDisposable.Dispose if available");
+ return null;
+ }
+
+ if ((method.Attributes & MethodAttributes.SpecialName) != 0 && IsSpecialMethodInvocation (method)) {
+ return null;
+ }
+
+ if (mg.InstanceExpression != null)
+ mg.InstanceExpression.CheckMarshalByRefAccess ();
+
+ eclass = ExprClass.Value;
+ this.method = method;
+ return this;
+ }
+
+ bool IsSpecialMethodInvocation (MethodBase method)
+ {
+ IMethodData md = TypeManager.GetMethod (method);
+ if (md != null) {
+ if (!(md is AbstractPropertyEventMethod) && !(md is Operator))
+ return false;
+ } else {
+ if (!TypeManager.IsSpecialMethod (method))
+ return false;
+
+ int args = TypeManager.GetParameterData (method).Count;
+ if (method.Name.StartsWith ("get_") && args > 0)
+ return false;
+ else if (method.Name.StartsWith ("set_") && args > 2)
+ return false;
+
+ // TODO: check operators and events as well ?
+ }
+
+ Report.SymbolRelatedToPreviousError (method);
+ Report.Error (571, loc, "`{0}': cannot explicitly call operator or accessor",
+ TypeManager.CSharpSignature (method, true));
+
+ return true;
+ }
+
+ // <summary>
+ // Emits the list of arguments as an array
+ // </summary>
+ static void EmitParams (EmitContext ec, int idx, ArrayList arguments)
+ {
+ ILGenerator ig = ec.ig;
+ int count = arguments.Count - idx;
+ Argument a = (Argument) arguments [idx];
+ Type t = a.Expr.Type;
+
+ IntConstant.EmitInt (ig, count);
+ ig.Emit (OpCodes.Newarr, TypeManager.TypeToCoreType (t));
+
+ int top = arguments.Count;
+ for (int j = idx; j < top; j++){
+ a = (Argument) arguments [j];
+
+ ig.Emit (OpCodes.Dup);
+ IntConstant.EmitInt (ig, j - idx);
+
+ bool is_stobj, has_type_arg;
+ OpCode op = ArrayAccess.GetStoreOpcode (t, out is_stobj, out has_type_arg);
+ if (is_stobj)
+ ig.Emit (OpCodes.Ldelema, t);
+
+ a.Emit (ec);
+
+ if (has_type_arg)
+ ig.Emit (op, t);
+ else
+ ig.Emit (op);
+ }
+ }
+
+ /// <summary>
+ /// Emits a list of resolved Arguments that are in the arguments
+ /// ArrayList.
+ ///
+ /// The MethodBase argument might be null if the
+ /// emission of the arguments is known not to contain
+ /// a `params' field (for example in constructors or other routines
+ /// that keep their arguments in this structure)
+ ///
+ /// if `dup_args' is true, a copy of the arguments will be left
+ /// on the stack. If `dup_args' is true, you can specify `this_arg'
+ /// which will be duplicated before any other args. Only EmitCall
+ /// should be using this interface.
+ /// </summary>
+ public static void EmitArguments (EmitContext ec, MethodBase mb, ArrayList arguments, bool dup_args, LocalTemporary this_arg)
+ {
+ ParameterData pd = mb == null ? null : TypeManager.GetParameterData (mb);
+ int top = arguments == null ? 0 : arguments.Count;
+ LocalTemporary [] temps = null;
+
+ if (dup_args && top != 0)
+ temps = new LocalTemporary [top];
+
+ for (int i = 0; i < top; i++){
+ Argument a = (Argument) arguments [i];
+
+ if (pd != null){
+ if (pd.ParameterModifier (i) == Parameter.Modifier.PARAMS){
+ //
+ // Special case if we are passing the same data as the
+ // params argument, do not put it in an array.
+ //
+ if (pd.ParameterType (i) == a.Type)
+ a.Emit (ec);
+ else
+ EmitParams (ec, i, arguments);
+ return;
+ }
+ }
+
+ a.Emit (ec);
+ if (dup_args) {
+ ec.ig.Emit (OpCodes.Dup);
+ (temps [i] = new LocalTemporary (a.Type)).Store (ec);
+ }
+ }
+
+ if (dup_args) {
+ if (this_arg != null)
+ this_arg.Emit (ec);
+
+ for (int i = 0; i < top; i ++) {
+ temps [i].Emit (ec);
+ temps [i].Release (ec);
+ }
+ }
+
+ if (pd != null && pd.Count > top &&
+ pd.ParameterModifier (top) == Parameter.Modifier.PARAMS){
+ ILGenerator ig = ec.ig;
+
+ IntConstant.EmitInt (ig, 0);
+ ig.Emit (OpCodes.Newarr, TypeManager.GetElementType (pd.ParameterType (top)));
+ }
+ }
+
+ static Type[] GetVarargsTypes (MethodBase mb, ArrayList arguments)
+ {
+ ParameterData pd = TypeManager.GetParameterData (mb);
+
+ if (arguments == null)
+ return new Type [0];
+
+ Argument a = (Argument) arguments [pd.Count - 1];
+ Arglist list = (Arglist) a.Expr;
+
+ return list.ArgumentTypes;
+ }
+
+ /// <summary>
+ /// This checks the ConditionalAttribute on the method
+ /// </summary>
+ static bool IsMethodExcluded (MethodBase method)
+ {
+ if (method.IsConstructor)
+ return false;
+
+ IMethodData md = TypeManager.GetMethod (method);
+ if (md != null)
+ return md.IsExcluded ();
+
+ // For some methods (generated by delegate class) GetMethod returns null
+ // because they are not included in builder_to_method table
+ if (method.DeclaringType is TypeBuilder)
+ return false;
+
+ return AttributeTester.IsConditionalMethodExcluded (method);
+ }
+
+ /// <remarks>
+ /// is_base tells whether we want to force the use of the `call'
+ /// opcode instead of using callvirt. Call is required to call
+ /// a specific method, while callvirt will always use the most
+ /// recent method in the vtable.
+ ///
+ /// is_static tells whether this is an invocation on a static method
+ ///
+ /// instance_expr is an expression that represents the instance
+ /// it must be non-null if is_static is false.
+ ///
+ /// method is the method to invoke.
+ ///
+ /// Arguments is the list of arguments to pass to the method or constructor.
+ /// </remarks>
+ public static void EmitCall (EmitContext ec, bool is_base,
+ bool is_static, Expression instance_expr,
+ MethodBase method, ArrayList Arguments, Location loc)
+ {
+ EmitCall (ec, is_base, is_static, instance_expr, method, Arguments, loc, false, false);
+ }
+
+ // `dup_args' leaves an extra copy of the arguments on the stack
+ // `omit_args' does not leave any arguments at all.
+ // So, basically, you could make one call with `dup_args' set to true,
+ // and then another with `omit_args' set to true, and the two calls
+ // would have the same set of arguments. However, each argument would
+ // only have been evaluated once.
+ public static void EmitCall (EmitContext ec, bool is_base,
+ bool is_static, Expression instance_expr,
+ MethodBase method, ArrayList Arguments, Location loc,
+ bool dup_args, bool omit_args)
+ {
+ ILGenerator ig = ec.ig;
+ bool struct_call = false;
+ bool this_call = false;
+ LocalTemporary this_arg = null;
+
+ Type decl_type = method.DeclaringType;
+
+ if (!RootContext.StdLib) {
+ // Replace any calls to the system's System.Array type with calls to
+ // the newly created one.
+ if (method == TypeManager.system_int_array_get_length)
+ method = TypeManager.int_array_get_length;
+ else if (method == TypeManager.system_int_array_get_rank)
+ method = TypeManager.int_array_get_rank;
+ else if (method == TypeManager.system_object_array_clone)
+ method = TypeManager.object_array_clone;
+ else if (method == TypeManager.system_int_array_get_length_int)
+ method = TypeManager.int_array_get_length_int;
+ else if (method == TypeManager.system_int_array_get_lower_bound_int)
+ method = TypeManager.int_array_get_lower_bound_int;
+ else if (method == TypeManager.system_int_array_get_upper_bound_int)
+ method = TypeManager.int_array_get_upper_bound_int;
+ else if (method == TypeManager.system_void_array_copyto_array_int)
+ method = TypeManager.void_array_copyto_array_int;
+ }
+
+ if (!ec.IsInObsoleteScope) {
+ //
+ // This checks ObsoleteAttribute on the method and on the declaring type
+ //
+ ObsoleteAttribute oa = AttributeTester.GetMethodObsoleteAttribute (method);
+ if (oa != null)
+ AttributeTester.Report_ObsoleteMessage (oa, TypeManager.CSharpSignature (method), loc);
+
+ oa = AttributeTester.GetObsoleteAttribute (method.DeclaringType);
+ if (oa != null) {
+ AttributeTester.Report_ObsoleteMessage (oa, method.DeclaringType.FullName, loc);
+ }
+ }
+
+ if (IsMethodExcluded (method))
+ return;
+
+ if (!is_static){
+ if (instance_expr == EmptyExpression.Null) {
+ SimpleName.Error_ObjectRefRequired (ec, loc, TypeManager.CSharpSignature (method));
+ return;
+ }
+
+ this_call = instance_expr is This;
+ if (decl_type.IsValueType || (!this_call && instance_expr.Type.IsValueType))
+ struct_call = true;
+
+ //
+ // If this is ourselves, push "this"
+ //
+ if (!omit_args) {
+ Type t = null;
+ Type iexpr_type = instance_expr.Type;
+
+ //
+ // Push the instance expression
+ //
+ if (TypeManager.IsValueType (iexpr_type)) {
+ //
+ // Special case: calls to a function declared in a
+ // reference-type with a value-type argument need
+ // to have their value boxed.
+ if (decl_type.IsValueType ||
+ TypeManager.IsGenericParameter (iexpr_type)) {
+ //
+ // If the expression implements IMemoryLocation, then
+ // we can optimize and use AddressOf on the
+ // return.
+ //
+ // If not we have to use some temporary storage for
+ // it.
+ if (instance_expr is IMemoryLocation) {
+ ((IMemoryLocation)instance_expr).
+ AddressOf (ec, AddressOp.LoadStore);
+ } else {
+ LocalTemporary temp = new LocalTemporary (iexpr_type);
+ instance_expr.Emit (ec);
+ temp.Store (ec);
+ temp.AddressOf (ec, AddressOp.Load);
+ }
+
+ // avoid the overhead of doing this all the time.
+ if (dup_args)
+ t = TypeManager.GetReferenceType (iexpr_type);
+ } else {
+ instance_expr.Emit (ec);
+ ig.Emit (OpCodes.Box, instance_expr.Type);
+ t = TypeManager.object_type;
+ }
+ } else {
+ instance_expr.Emit (ec);
+ t = instance_expr.Type;
+ }
+
+ if (dup_args) {
+ ig.Emit (OpCodes.Dup);
+ if (Arguments != null && Arguments.Count != 0) {
+ this_arg = new LocalTemporary (t);
+ this_arg.Store (ec);
+ }
+ }
+ }
+ }
+
+ if (!omit_args)
+ EmitArguments (ec, method, Arguments, dup_args, this_arg);
+
+#if GMCS_SOURCE
+ if ((instance_expr != null) && (instance_expr.Type.IsGenericParameter))
+ ig.Emit (OpCodes.Constrained, instance_expr.Type);
+#endif
+
+ OpCode call_op;
+ if (is_static || struct_call || is_base || (this_call && !method.IsVirtual))
+ call_op = OpCodes.Call;
+ else
+ call_op = OpCodes.Callvirt;
+
+ if ((method.CallingConvention & CallingConventions.VarArgs) != 0) {
+ Type[] varargs_types = GetVarargsTypes (method, Arguments);
+ ig.EmitCall (call_op, (MethodInfo) method, varargs_types);
+ return;
+ }
+
+ //
+ // If you have:
+ // this.DoFoo ();
+ // and DoFoo is not virtual, you can omit the callvirt,
+ // because you don't need the null checking behavior.
+ //
+ if (method is MethodInfo)
+ ig.Emit (call_op, (MethodInfo) method);
+ else
+ ig.Emit (call_op, (ConstructorInfo) method);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ MethodGroupExpr mg = (MethodGroupExpr) this.expr;
+
+ EmitCall (ec, mg.IsBase, method.IsStatic, mg.InstanceExpression, method, Arguments, loc);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ Emit (ec);
+
+ //
+ // Pop the return value if there is one
+ //
+ if (method is MethodInfo){
+ Type ret = ((MethodInfo)method).ReturnType;
+ if (TypeManager.TypeToCoreType (ret) != TypeManager.void_type)
+ ec.ig.Emit (OpCodes.Pop);
+ }
+ }
+ }
+
+ public class InvocationOrCast : ExpressionStatement
+ {
+ Expression expr;
+ Expression argument;
+
+ public InvocationOrCast (Expression expr, Expression argument)
+ {
+ this.expr = expr;
+ this.argument = argument;
+ this.loc = expr.Location;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // First try to resolve it as a cast.
+ //
+ TypeExpr te = expr.ResolveAsTypeTerminal (ec, true);
+ if ((te != null) && (te.eclass == ExprClass.Type)) {
+ Cast cast = new Cast (te, argument, loc);
+ return cast.Resolve (ec);
+ }
+
+ //
+ // This can either be a type or a delegate invocation.
+ // Let's just resolve it and see what we'll get.
+ //
+ expr = expr.Resolve (ec, ResolveFlags.Type | ResolveFlags.VariableOrValue);
+ if (expr == null)
+ return null;
+
+ //
+ // Ok, so it's a Cast.
+ //
+ if (expr.eclass == ExprClass.Type) {
+ Cast cast = new Cast (new TypeExpression (expr.Type, loc), argument, loc);
+ return cast.Resolve (ec);
+ }
+
+ //
+ // It's a delegate invocation.
+ //
+ if (!TypeManager.IsDelegateType (expr.Type)) {
+ Error (149, "Method name expected");
+ return null;
+ }
+
+ ArrayList args = new ArrayList ();
+ args.Add (new Argument (argument, Argument.AType.Expression));
+ DelegateInvocation invocation = new DelegateInvocation (expr, args, loc);
+ return invocation.Resolve (ec);
+ }
+
+ void error201 ()
+ {
+ Error (201, "Only assignment, call, increment, decrement and new object " +
+ "expressions can be used as a statement");
+ }
+
+ public override ExpressionStatement ResolveStatement (EmitContext ec)
+ {
+ //
+ // First try to resolve it as a cast.
+ //
+ TypeExpr te = expr.ResolveAsTypeTerminal (ec, true);
+ if ((te != null) && (te.eclass == ExprClass.Type)) {
+ error201 ();
+ return null;
+ }
+
+ //
+ // This can either be a type or a delegate invocation.
+ // Let's just resolve it and see what we'll get.
+ //
+ expr = expr.Resolve (ec, ResolveFlags.Type | ResolveFlags.VariableOrValue);
+ if ((expr == null) || (expr.eclass == ExprClass.Type)) {
+ error201 ();
+ return null;
+ }
+
+ //
+ // It's a delegate invocation.
+ //
+ if (!TypeManager.IsDelegateType (expr.Type)) {
+ Error (149, "Method name expected");
+ return null;
+ }
+
+ ArrayList args = new ArrayList ();
+ args.Add (new Argument (argument, Argument.AType.Expression));
+ DelegateInvocation invocation = new DelegateInvocation (expr, args, loc);
+ return invocation.ResolveStatement (ec);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Cannot happen");
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ throw new Exception ("Cannot happen");
+ }
+ }
+
+ //
+ // This class is used to "disable" the code generation for the
+ // temporary variable when initializing value types.
+ //
+ class EmptyAddressOf : EmptyExpression, IMemoryLocation {
+ public void AddressOf (EmitContext ec, AddressOp Mode)
+ {
+ // nothing
+ }
+ }
+
+ /// <summary>
+ /// Implements the new expression
+ /// </summary>
+ public class New : ExpressionStatement, IMemoryLocation {
+ public readonly ArrayList Arguments;
+
+ //
+ // During bootstrap, it contains the RequestedType,
+ // but if `type' is not null, it *might* contain a NewDelegate
+ // (because of field multi-initialization)
+ //
+ public Expression RequestedType;
+
+ MethodBase method = null;
+
+ //
+ // If set, the new expression is for a value_target, and
+ // we will not leave anything on the stack.
+ //
+ Expression value_target;
+ bool value_target_set = false;
+ bool is_type_parameter = false;
+
+ public New (Expression requested_type, ArrayList arguments, Location l)
+ {
+ RequestedType = requested_type;
+ Arguments = arguments;
+ loc = l;
+ }
+
+ public bool SetValueTypeVariable (Expression value)
+ {
+ value_target = value;
+ value_target_set = true;
+ if (!(value_target is IMemoryLocation)){
+ Error_UnexpectedKind (null, "variable", loc);
+ return false;
+ }
+ return true;
+ }
+
+ //
+ // This function is used to disable the following code sequence for
+ // value type initialization:
+ //
+ // AddressOf (temporary)
+ // Construct/Init
+ // LoadTemporary
+ //
+ // Instead the provide will have provided us with the address on the
+ // stack to store the results.
+ //
+ static Expression MyEmptyExpression;
+
+ public void DisableTemporaryValueType ()
+ {
+ if (MyEmptyExpression == null)
+ MyEmptyExpression = new EmptyAddressOf ();
+
+ //
+ // To enable this, look into:
+ // test-34 and test-89 and self bootstrapping.
+ //
+ // For instance, we can avoid a copy by using `newobj'
+ // instead of Call + Push-temp on value types.
+// value_target = MyEmptyExpression;
+ }
+
+
+ /// <summary>
+ /// Converts complex core type syntax like 'new int ()' to simple constant
+ /// </summary>
+ public static Constant Constantify (Type t)
+ {
+ if (t == TypeManager.int32_type)
+ return new IntConstant (0, Location.Null);
+ if (t == TypeManager.uint32_type)
+ return new UIntConstant (0, Location.Null);
+ if (t == TypeManager.int64_type)
+ return new LongConstant (0, Location.Null);
+ if (t == TypeManager.uint64_type)
+ return new ULongConstant (0, Location.Null);
+ if (t == TypeManager.float_type)
+ return new FloatConstant (0, Location.Null);
+ if (t == TypeManager.double_type)
+ return new DoubleConstant (0, Location.Null);
+ if (t == TypeManager.short_type)
+ return new ShortConstant (0, Location.Null);
+ if (t == TypeManager.ushort_type)
+ return new UShortConstant (0, Location.Null);
+ if (t == TypeManager.sbyte_type)
+ return new SByteConstant (0, Location.Null);
+ if (t == TypeManager.byte_type)
+ return new ByteConstant (0, Location.Null);
+ if (t == TypeManager.char_type)
+ return new CharConstant ('\0', Location.Null);
+ if (t == TypeManager.bool_type)
+ return new BoolConstant (false, Location.Null);
+ if (t == TypeManager.decimal_type)
+ return new DecimalConstant (0, Location.Null);
+ if (TypeManager.IsEnumType (t))
+ return new EnumConstant (Constantify (TypeManager.EnumToUnderlying (t)), t);
+
+ return null;
+ }
+
+ //
+ // Checks whether the type is an interface that has the
+ // [ComImport, CoClass] attributes and must be treated
+ // specially
+ //
+ public Expression CheckComImport (EmitContext ec)
+ {
+ if (!type.IsInterface)
+ return null;
+
+ //
+ // Turn the call into:
+ // (the-interface-stated) (new class-referenced-in-coclassattribute ())
+ //
+ Type real_class = AttributeTester.GetCoClassAttribute (type);
+ if (real_class == null)
+ return null;
+
+ New proxy = new New (new TypeExpression (real_class, loc), Arguments, loc);
+ Cast cast = new Cast (new TypeExpression (type, loc), proxy, loc);
+ return cast.Resolve (ec);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // The New DoResolve might be called twice when initializing field
+ // expressions (see EmitFieldInitializers, the call to
+ // GetInitializerExpression will perform a resolve on the expression,
+ // and later the assign will trigger another resolution
+ //
+ // This leads to bugs (#37014)
+ //
+ if (type != null){
+ if (RequestedType is NewDelegate)
+ return RequestedType;
+ return this;
+ }
+
+ TypeExpr texpr = RequestedType.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return null;
+
+ type = texpr.Type;
+
+ if (type == TypeManager.void_type) {
+ Error_VoidInvalidInTheContext (loc);
+ return null;
+ }
+
+ if (Arguments == null) {
+ Expression c = Constantify (type);
+ if (c != null)
+ return c;
+ }
+
+ if (TypeManager.IsDelegateType (type)) {
+ RequestedType = (new NewDelegate (type, Arguments, loc)).Resolve (ec);
+ if (RequestedType != null)
+ if (!(RequestedType is DelegateCreation))
+ throw new Exception ("NewDelegate.Resolve returned a non NewDelegate: " + RequestedType.GetType ());
+ return RequestedType;
+ }
+
+#if GMCS_SOURCE
+ if (type.IsGenericParameter) {
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (type);
+
+ if ((gc == null) || (!gc.HasConstructorConstraint && !gc.IsValueType)) {
+ Error (304, String.Format (
+ "Cannot create an instance of the " +
+ "variable type '{0}' because it " +
+ "doesn't have the new() constraint",
+ type));
+ return null;
+ }
+
+ if ((Arguments != null) && (Arguments.Count != 0)) {
+ Error (417, String.Format (
+ "`{0}': cannot provide arguments " +
+ "when creating an instance of a " +
+ "variable type.", type));
+ return null;
+ }
+
+ is_type_parameter = true;
+ eclass = ExprClass.Value;
+ return this;
+ }
+#endif
+
+ if (type.IsAbstract && type.IsSealed) {
+ Report.SymbolRelatedToPreviousError (type);
+ Report.Error (712, loc, "Cannot create an instance of the static class `{0}'", TypeManager.CSharpName (type));
+ return null;
+ }
+
+ if (type.IsInterface || type.IsAbstract){
+ RequestedType = CheckComImport (ec);
+ if (RequestedType != null)
+ return RequestedType;
+
+ Report.SymbolRelatedToPreviousError (type);
+ Report.Error (144, loc, "Cannot create an instance of the abstract class or interface `{0}'", TypeManager.CSharpName (type));
+ return null;
+ }
+
+ bool is_struct = type.IsValueType;
+ eclass = ExprClass.Value;
+
+ //
+ // SRE returns a match for .ctor () on structs (the object constructor),
+ // so we have to manually ignore it.
+ //
+ if (is_struct && Arguments == null)
+ return this;
+
+ // For member-lookup, treat 'new Foo (bar)' as call to 'foo.ctor (bar)', where 'foo' is of type 'Foo'.
+ Expression ml = MemberLookupFinal (ec, type, type, ".ctor",
+ MemberTypes.Constructor, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
+
+ if (ml == null)
+ return null;
+
+ MethodGroupExpr mg = ml as MethodGroupExpr;
+
+ if (mg == null) {
+ ml.Error_UnexpectedKind (ec.DeclContainer, "method group", loc);
+ return null;
+ }
+
+ if (Arguments != null){
+ foreach (Argument a in Arguments){
+ if (!a.Resolve (ec, loc))
+ return null;
+ }
+ }
+
+ method = Invocation.OverloadResolve (ec, mg, Arguments, false, loc);
+ if (method == null) {
+ if (almostMatchedMembers.Count != 0)
+ MemberLookupFailed (ec.ContainerType, type, type, ".ctor", null, true, loc);
+ return null;
+ }
+
+ return this;
+ }
+
+ bool DoEmitTypeParameter (EmitContext ec)
+ {
+#if GMCS_SOURCE
+ ILGenerator ig = ec.ig;
+
+ ig.Emit (OpCodes.Ldtoken, type);
+ ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
+ ig.Emit (OpCodes.Call, TypeManager.activator_create_instance);
+ ig.Emit (OpCodes.Unbox_Any, type);
+ return true;
+#else
+ throw new InternalErrorException ();
+#endif
+ }
+
+ //
+ // This DoEmit can be invoked in two contexts:
+ // * As a mechanism that will leave a value on the stack (new object)
+ // * As one that wont (init struct)
+ //
+ // You can control whether a value is required on the stack by passing
+ // need_value_on_stack. The code *might* leave a value on the stack
+ // so it must be popped manually
+ //
+ // If we are dealing with a ValueType, we have a few
+ // situations to deal with:
+ //
+ // * The target is a ValueType, and we have been provided
+ // the instance (this is easy, we are being assigned).
+ //
+ // * The target of New is being passed as an argument,
+ // to a boxing operation or a function that takes a
+ // ValueType.
+ //
+ // In this case, we need to create a temporary variable
+ // that is the argument of New.
+ //
+ // Returns whether a value is left on the stack
+ //
+ bool DoEmit (EmitContext ec, bool need_value_on_stack)
+ {
+ bool is_value_type = TypeManager.IsValueType (type);
+ ILGenerator ig = ec.ig;
+
+ if (is_value_type){
+ IMemoryLocation ml;
+
+ // Allow DoEmit() to be called multiple times.
+ // We need to create a new LocalTemporary each time since
+ // you can't share LocalBuilders among ILGeneators.
+ if (!value_target_set)
+ value_target = new LocalTemporary (type);
+
+ ml = (IMemoryLocation) value_target;
+ ml.AddressOf (ec, AddressOp.Store);
+ }
+
+ if (method != null)
+ Invocation.EmitArguments (ec, method, Arguments, false, null);
+
+ if (is_value_type){
+ if (method == null)
+ ig.Emit (OpCodes.Initobj, type);
+ else
+ ig.Emit (OpCodes.Call, (ConstructorInfo) method);
+ if (need_value_on_stack){
+ value_target.Emit (ec);
+ return true;
+ }
+ return false;
+ } else {
+ ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
+ return true;
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ if (is_type_parameter)
+ DoEmitTypeParameter (ec);
+ else
+ DoEmit (ec, true);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ if (is_type_parameter)
+ throw new InvalidOperationException ();
+
+ if (DoEmit (ec, false))
+ ec.ig.Emit (OpCodes.Pop);
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp Mode)
+ {
+ if (is_type_parameter)
+ throw new InvalidOperationException ();
+
+ if (!type.IsValueType){
+ //
+ // We throw an exception. So far, I believe we only need to support
+ // value types:
+ // foreach (int j in new StructType ())
+ // see bug 42390
+ //
+ throw new Exception ("AddressOf should not be used for classes");
+ }
+
+ if (!value_target_set)
+ value_target = new LocalTemporary (type);
+
+ IMemoryLocation ml = (IMemoryLocation) value_target;
+ ml.AddressOf (ec, AddressOp.Store);
+ if (method != null)
+ Invocation.EmitArguments (ec, method, Arguments, false, null);
+
+ if (method == null)
+ ec.ig.Emit (OpCodes.Initobj, type);
+ else
+ ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
+
+ ((IMemoryLocation) value_target).AddressOf (ec, Mode);
+ }
+ }
+
+ /// <summary>
+ /// 14.5.10.2: Represents an array creation expression.
+ /// </summary>
+ ///
+ /// <remarks>
+ /// There are two possible scenarios here: one is an array creation
+ /// expression that specifies the dimensions and optionally the
+ /// initialization data and the other which does not need dimensions
+ /// specified but where initialization data is mandatory.
+ /// </remarks>
+ public class ArrayCreation : Expression {
+ Expression requested_base_type;
+ ArrayList initializers;
+
+ //
+ // The list of Argument types.
+ // This is used to construct the `newarray' or constructor signature
+ //
+ ArrayList arguments;
+
+ //
+ // Method used to create the array object.
+ //
+ MethodBase new_method = null;
+
+ Type array_element_type;
+ Type underlying_type;
+ bool is_one_dimensional = false;
+ bool is_builtin_type = false;
+ bool expect_initializers = false;
+ int num_arguments = 0;
+ int dimensions = 0;
+ string rank;
+
+ ArrayList array_data;
+
+ IDictionary bounds;
+
+ // The number of constants in array initializers
+ int const_initializers_count;
+
+ public ArrayCreation (Expression requested_base_type, ArrayList exprs, string rank, ArrayList initializers, Location l)
+ {
+ this.requested_base_type = requested_base_type;
+ this.initializers = initializers;
+ this.rank = rank;
+ loc = l;
+
+ arguments = new ArrayList ();
+
+ foreach (Expression e in exprs) {
+ arguments.Add (new Argument (e, Argument.AType.Expression));
+ num_arguments++;
+ }
+ }
+
+ public ArrayCreation (Expression requested_base_type, string rank, ArrayList initializers, Location l)
+ {
+ this.requested_base_type = requested_base_type;
+ this.initializers = initializers;
+ this.rank = rank;
+ loc = l;
+
+ //this.rank = rank.Substring (0, rank.LastIndexOf ('['));
+ //
+ //string tmp = rank.Substring (rank.LastIndexOf ('['));
+ //
+ //dimensions = tmp.Length - 1;
+ expect_initializers = true;
+ }
+
+ public Expression FormArrayType (Expression base_type, int idx_count, string rank)
+ {
+ StringBuilder sb = new StringBuilder (rank);
+
+ sb.Append ("[");
+ for (int i = 1; i < idx_count; i++)
+ sb.Append (",");
+
+ sb.Append ("]");
+
+ return new ComposedCast (base_type, sb.ToString (), loc);
+ }
+
+ void Error_IncorrectArrayInitializer ()
+ {
+ Error (178, "Invalid rank specifier: expected `,' or `]'");
+ }
+
+ bool CheckIndices (EmitContext ec, ArrayList probe, int idx, bool specified_dims)
+ {
+ if (specified_dims) {
+ Argument a = (Argument) arguments [idx];
+
+ if (!a.Resolve (ec, loc))
+ return false;
+
+ Constant c = a.Expr as Constant;
+ if (c != null) {
+ c = c.ImplicitConversionRequired (TypeManager.int32_type, a.Expr.Location);
+ }
+
+ if (c == null) {
+ Report.Error (150, a.Expr.Location, "A constant value is expected");
+ return false;
+ }
+
+ int value = (int) c.GetValue ();
+
+ if (value != probe.Count) {
+ Error_IncorrectArrayInitializer ();
+ return false;
+ }
+
+ bounds [idx] = value;
+ }
+
+ int child_bounds = -1;
+ for (int i = 0; i < probe.Count; ++i) {
+ object o = probe [i];
+ if (o is ArrayList) {
+ ArrayList sub_probe = o as ArrayList;
+ int current_bounds = sub_probe.Count;
+
+ if (child_bounds == -1)
+ child_bounds = current_bounds;
+
+ else if (child_bounds != current_bounds){
+ Error_IncorrectArrayInitializer ();
+ return false;
+ }
+ if (idx + 1 >= dimensions){
+ Error (623, "Array initializers can only be used in a variable or field initializer. Try using a new expression instead");
+ return false;
+ }
+
+ bool ret = CheckIndices (ec, sub_probe, idx + 1, specified_dims);
+ if (!ret)
+ return false;
+ } else {
+ if (child_bounds != -1){
+ Error_IncorrectArrayInitializer ();
+ return false;
+ }
+
+ Expression tmp = (Expression) o;
+ tmp = tmp.Resolve (ec);
+ if (tmp == null)
+ return false;
+
+ Expression conv = Convert.ImplicitConversionRequired (
+ ec, tmp, underlying_type, loc);
+
+ if (conv == null)
+ return false;
+
+ // Initializers with the default values can be ignored
+ Constant c = tmp as Constant;
+ if (c != null) {
+ if (c.IsDefaultInitializer (array_element_type)) {
+ conv = null;
+ }
+ else {
+ ++const_initializers_count;
+ }
+ } else {
+ // Used to invalidate static initializer
+ const_initializers_count = int.MinValue;
+ }
+
+ array_data.Add (conv);
+ }
+ }
+
+ return true;
+ }
+
+ public void UpdateIndices ()
+ {
+ int i = 0;
+ for (ArrayList probe = initializers; probe != null;) {
+ if (probe.Count > 0 && probe [0] is ArrayList) {
+ Expression e = new IntConstant (probe.Count, Location.Null);
+ arguments.Add (new Argument (e, Argument.AType.Expression));
+
+ bounds [i++] = probe.Count;
+
+ probe = (ArrayList) probe [0];
+
+ } else {
+ Expression e = new IntConstant (probe.Count, Location.Null);
+ arguments.Add (new Argument (e, Argument.AType.Expression));
+
+ bounds [i++] = probe.Count;
+ return;
+ }
+ }
+
+ }
+
+ bool ResolveInitializers (EmitContext ec)
+ {
+ if (initializers == null) {
+ return !expect_initializers;
+ }
+
+ if (underlying_type == null)
+ return false;
+
+ //
+ // We use this to store all the date values in the order in which we
+ // will need to store them in the byte blob later
+ //
+ array_data = new ArrayList ();
+ bounds = new System.Collections.Specialized.HybridDictionary ();
+
+ if (arguments != null)
+ return CheckIndices (ec, initializers, 0, true);
+
+ arguments = new ArrayList ();
+
+ if (!CheckIndices (ec, initializers, 0, false))
+ return false;
+
+ UpdateIndices ();
+
+ if (arguments.Count != dimensions) {
+ Error_IncorrectArrayInitializer ();
+ return false;
+ }
+
+ return true;
+ }
+
+ //
+ // Creates the type of the array
+ //
+ bool LookupType (EmitContext ec)
+ {
+ StringBuilder array_qualifier = new StringBuilder (rank);
+
+ //
+ // `In the first form allocates an array instace of the type that results
+ // from deleting each of the individual expression from the expression list'
+ //
+ if (num_arguments > 0) {
+ array_qualifier.Append ("[");
+ for (int i = num_arguments-1; i > 0; i--)
+ array_qualifier.Append (",");
+ array_qualifier.Append ("]");
+ }
+
+ //
+ // Lookup the type
+ //
+ TypeExpr array_type_expr;
+ array_type_expr = new ComposedCast (requested_base_type, array_qualifier.ToString (), loc);
+ array_type_expr = array_type_expr.ResolveAsTypeTerminal (ec, false);
+ if (array_type_expr == null)
+ return false;
+
+ type = array_type_expr.Type;
+ underlying_type = TypeManager.GetElementType (type);
+ dimensions = type.GetArrayRank ();
+
+ return true;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (type != null)
+ return this;
+
+ if (!LookupType (ec))
+ return null;
+
+ array_element_type = TypeManager.GetElementType (type);
+ if (array_element_type.IsAbstract && array_element_type.IsSealed) {
+ Report.Error (719, loc, "`{0}': array elements cannot be of static type", TypeManager.CSharpName (array_element_type));
+ return null;
+ }
+
+ //
+ // First step is to validate the initializers and fill
+ // in any missing bits
+ //
+ if (!ResolveInitializers (ec))
+ return null;
+
+ int arg_count;
+ if (arguments == null)
+ arg_count = 0;
+ else {
+ arg_count = arguments.Count;
+ foreach (Argument a in arguments){
+ if (!a.Resolve (ec, loc))
+ return null;
+
+ Expression real_arg = ExpressionToArrayArgument (ec, a.Expr, loc);
+ if (real_arg == null)
+ return null;
+
+ a.Expr = real_arg;
+ }
+ }
+
+ if (arg_count == 1) {
+ is_one_dimensional = true;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ is_builtin_type = TypeManager.IsBuiltinType (type);
+
+ if (is_builtin_type) {
+ Expression ml;
+
+ ml = MemberLookup (ec.ContainerType, type, ".ctor", MemberTypes.Constructor,
+ AllBindingFlags, loc);
+
+ if (!(ml is MethodGroupExpr)) {
+ ml.Error_UnexpectedKind (ec.DeclContainer, "method group", loc);
+ return null;
+ }
+
+ if (ml == null) {
+ Error (-6, "New invocation: Can not find a constructor for " +
+ "this argument list");
+ return null;
+ }
+
+ new_method = Invocation.OverloadResolve (
+ ec, (MethodGroupExpr) ml, arguments, false, loc);
+
+ if (new_method == null) {
+ Error (-6, "New invocation: Can not find a constructor for " +
+ "this argument list");
+ return null;
+ }
+
+ eclass = ExprClass.Value;
+ return this;
+ } else {
+ ModuleBuilder mb = CodeGen.Module.Builder;
+ ArrayList args = new ArrayList ();
+
+ if (arguments != null) {
+ for (int i = 0; i < arg_count; i++)
+ args.Add (TypeManager.int32_type);
+ }
+
+ Type [] arg_types = null;
+
+ if (args.Count > 0)
+ arg_types = new Type [args.Count];
+
+ args.CopyTo (arg_types, 0);
+
+ new_method = mb.GetArrayMethod (type, ".ctor", CallingConventions.HasThis, null,
+ arg_types);
+
+ if (new_method == null) {
+ Error (-6, "New invocation: Can not find a constructor for " +
+ "this argument list");
+ return null;
+ }
+
+ eclass = ExprClass.Value;
+ return this;
+ }
+ }
+
+ byte [] MakeByteBlob ()
+ {
+ int factor;
+ byte [] data;
+ byte [] element;
+ int count = array_data.Count;
+
+ if (underlying_type.IsEnum)
+ underlying_type = TypeManager.EnumToUnderlying (underlying_type);
+
+ factor = GetTypeSize (underlying_type);
+ if (factor == 0)
+ throw new Exception ("unrecognized type in MakeByteBlob: " + underlying_type);
+
+ data = new byte [(count * factor + 4) & ~3];
+ int idx = 0;
+
+ for (int i = 0; i < count; ++i) {
+ object v = array_data [i];
+
+ if (v is EnumConstant)
+ v = ((EnumConstant) v).Child;
+
+ if (v is Constant && !(v is StringConstant))
+ v = ((Constant) v).GetValue ();
+ else {
+ idx += factor;
+ continue;
+ }
+
+ if (underlying_type == TypeManager.int64_type){
+ if (!(v is Expression)){
+ long val = (long) v;
+
+ for (int j = 0; j < factor; ++j) {
+ data [idx + j] = (byte) (val & 0xFF);
+ val = (val >> 8);
+ }
+ }
+ } else if (underlying_type == TypeManager.uint64_type){
+ if (!(v is Expression)){
+ ulong val = (ulong) v;
+
+ for (int j = 0; j < factor; ++j) {
+ data [idx + j] = (byte) (val & 0xFF);
+ val = (val >> 8);
+ }
+ }
+ } else if (underlying_type == TypeManager.float_type) {
+ if (!(v is Expression)){
+ element = BitConverter.GetBytes ((float) v);
+
+ for (int j = 0; j < factor; ++j)
+ data [idx + j] = element [j];
+ }
+ } else if (underlying_type == TypeManager.double_type) {
+ if (!(v is Expression)){
+ element = BitConverter.GetBytes ((double) v);
+
+ for (int j = 0; j < factor; ++j)
+ data [idx + j] = element [j];
+ }
+ } else if (underlying_type == TypeManager.char_type){
+ if (!(v is Expression)){
+ int val = (int) ((char) v);
+
+ data [idx] = (byte) (val & 0xff);
+ data [idx+1] = (byte) (val >> 8);
+ }
+ } else if (underlying_type == TypeManager.short_type){
+ if (!(v is Expression)){
+ int val = (int) ((short) v);
+
+ data [idx] = (byte) (val & 0xff);
+ data [idx+1] = (byte) (val >> 8);
+ }
+ } else if (underlying_type == TypeManager.ushort_type){
+ if (!(v is Expression)){
+ int val = (int) ((ushort) v);
+
+ data [idx] = (byte) (val & 0xff);
+ data [idx+1] = (byte) (val >> 8);
+ }
+ } else if (underlying_type == TypeManager.int32_type) {
+ if (!(v is Expression)){
+ int val = (int) v;
+
+ data [idx] = (byte) (val & 0xff);
+ data [idx+1] = (byte) ((val >> 8) & 0xff);
+ data [idx+2] = (byte) ((val >> 16) & 0xff);
+ data [idx+3] = (byte) (val >> 24);
+ }
+ } else if (underlying_type == TypeManager.uint32_type) {
+ if (!(v is Expression)){
+ uint val = (uint) v;
+
+ data [idx] = (byte) (val & 0xff);
+ data [idx+1] = (byte) ((val >> 8) & 0xff);
+ data [idx+2] = (byte) ((val >> 16) & 0xff);
+ data [idx+3] = (byte) (val >> 24);
+ }
+ } else if (underlying_type == TypeManager.sbyte_type) {
+ if (!(v is Expression)){
+ sbyte val = (sbyte) v;
+ data [idx] = (byte) val;
+ }
+ } else if (underlying_type == TypeManager.byte_type) {
+ if (!(v is Expression)){
+ byte val = (byte) v;
+ data [idx] = (byte) val;
+ }
+ } else if (underlying_type == TypeManager.bool_type) {
+ if (!(v is Expression)){
+ bool val = (bool) v;
+ data [idx] = (byte) (val ? 1 : 0);
+ }
+ } else if (underlying_type == TypeManager.decimal_type){
+ if (!(v is Expression)){
+ int [] bits = Decimal.GetBits ((decimal) v);
+ int p = idx;
+
+ // FIXME: For some reason, this doesn't work on the MS runtime.
+ int [] nbits = new int [4];
+ nbits [0] = bits [3];
+ nbits [1] = bits [2];
+ nbits [2] = bits [0];
+ nbits [3] = bits [1];
+
+ for (int j = 0; j < 4; j++){
+ data [p++] = (byte) (nbits [j] & 0xff);
+ data [p++] = (byte) ((nbits [j] >> 8) & 0xff);
+ data [p++] = (byte) ((nbits [j] >> 16) & 0xff);
+ data [p++] = (byte) (nbits [j] >> 24);
+ }
+ }
+ } else
+ throw new Exception ("Unrecognized type in MakeByteBlob: " + underlying_type);
+
+ idx += factor;
+ }
+
+ return data;
+ }
+
+ //
+ // Emits the initializers for the array
+ //
+ void EmitStaticInitializers (EmitContext ec)
+ {
+ //
+ // First, the static data
+ //
+ FieldBuilder fb;
+ ILGenerator ig = ec.ig;
+
+ byte [] data = MakeByteBlob ();
+
+ fb = RootContext.MakeStaticData (data);
+
+ ig.Emit (OpCodes.Dup);
+ ig.Emit (OpCodes.Ldtoken, fb);
+ ig.Emit (OpCodes.Call,
+ TypeManager.void_initializearray_array_fieldhandle);
+ }
+
+ //
+ // Emits pieces of the array that can not be computed at compile
+ // time (variables and string locations).
+ //
+ // This always expect the top value on the stack to be the array
+ //
+ void EmitDynamicInitializers (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ int dims = bounds.Count;
+ int [] current_pos = new int [dims];
+
+ MethodInfo set = null;
+
+ if (dims != 1){
+ Type [] args = new Type [dims + 1];
+
+ for (int j = 0; j < dims; j++)
+ args [j] = TypeManager.int32_type;
+ args [dims] = array_element_type;
+
+ set = CodeGen.Module.Builder.GetArrayMethod (
+ type, "Set",
+ CallingConventions.HasThis | CallingConventions.Standard,
+ TypeManager.void_type, args);
+ }
+
+ for (int i = 0; i < array_data.Count; i++){
+
+ Expression e = (Expression)array_data [i];
+
+ if (e != null) {
+ Type etype = e.Type;
+
+ ig.Emit (OpCodes.Dup);
+
+ for (int idx = 0; idx < dims; idx++)
+ IntConstant.EmitInt (ig, current_pos [idx]);
+
+ //
+ // If we are dealing with a struct, get the
+ // address of it, so we can store it.
+ //
+ if ((dims == 1) && etype.IsValueType &&
+ (!TypeManager.IsBuiltinOrEnum (etype) ||
+ etype == TypeManager.decimal_type)) {
+ if (e is New){
+ New n = (New) e;
+
+ //
+ // Let new know that we are providing
+ // the address where to store the results
+ //
+ n.DisableTemporaryValueType ();
+ }
+
+ ig.Emit (OpCodes.Ldelema, etype);
+ }
+
+ e.Emit (ec);
+
+ if (dims == 1) {
+ bool is_stobj, has_type_arg;
+ OpCode op = ArrayAccess.GetStoreOpcode (etype, out is_stobj, out has_type_arg);
+ if (is_stobj)
+ ig.Emit (OpCodes.Stobj, etype);
+ else if (has_type_arg)
+ ig.Emit (op, etype);
+ else
+ ig.Emit (op);
+ } else
+ ig.Emit (OpCodes.Call, set);
+
+ }
+
+ //
+ // Advance counter
+ //
+ for (int j = dims - 1; j >= 0; j--){
+ current_pos [j]++;
+ if (current_pos [j] < (int) bounds [j])
+ break;
+ current_pos [j] = 0;
+ }
+ }
+ }
+
+ void EmitArrayArguments (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ foreach (Argument a in arguments) {
+ Type atype = a.Type;
+ a.Emit (ec);
+
+ if (atype == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Conv_Ovf_U4);
+ else if (atype == TypeManager.int64_type)
+ ig.Emit (OpCodes.Conv_Ovf_I4);
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ EmitArrayArguments (ec);
+ if (is_one_dimensional)
+ ig.Emit (OpCodes.Newarr, array_element_type);
+ else {
+ if (is_builtin_type)
+ ig.Emit (OpCodes.Newobj, (ConstructorInfo) new_method);
+ else
+ ig.Emit (OpCodes.Newobj, (MethodInfo) new_method);
+ }
+
+ if (initializers == null)
+ return;
+
+ // This is a treshold for static initializers
+ // I tried to make more accurate but it seems to me that Array.Initialize is
+ // always slower (managed -> unmanaged switch?)
+ const int max_automatic_initializers = 200;
+
+ if (const_initializers_count > max_automatic_initializers && TypeManager.IsPrimitiveType (array_element_type)) {
+ EmitStaticInitializers (ec);
+ return;
+ }
+
+ EmitDynamicInitializers (ec);
+ }
+
+ public override bool GetAttributableValue (Type valueType, out object value)
+ {
+ if (!is_one_dimensional){
+// Report.Error (-211, Location, "attribute can not encode multi-dimensional arrays");
+ return base.GetAttributableValue (null, out value);
+ }
+
+ if (array_data == null) {
+ Constant c = (Constant)((Argument)arguments [0]).Expr;
+ if (c.IsDefaultValue) {
+ value = Array.CreateInstance (array_element_type, 0);
+ return true;
+ }
+// Report.Error (-212, Location, "array should be initialized when passing it to an attribute");
+ return base.GetAttributableValue (null, out value);
+ }
+
+ Array ret = Array.CreateInstance (array_element_type, array_data.Count);
+ object element_value;
+ for (int i = 0; i < ret.Length; ++i)
+ {
+ Expression e = (Expression)array_data [i];
+
+ // Is null when an initializer is optimized (value == predefined value)
+ if (e == null)
+ continue;
+
+ if (!e.GetAttributableValue (array_element_type, out element_value)) {
+ value = null;
+ return false;
+ }
+ ret.SetValue (element_value, i);
+ }
+ value = ret;
+ return true;
+ }
+ }
+
+ public sealed class CompilerGeneratedThis : This
+ {
+ public static This Instance = new CompilerGeneratedThis ();
+
+ private CompilerGeneratedThis ()
+ : base (Location.Null)
+ {
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ eclass = ExprClass.Variable;
+ type = ec.ContainerType;
+ variable = new SimpleThis (type);
+ return this;
+ }
+ }
+
+ /// <summary>
+ /// Represents the `this' construct
+ /// </summary>
+
+ public class This : VariableReference, IVariable
+ {
+ Block block;
+ VariableInfo variable_info;
+ protected Variable variable;
+ bool is_struct;
+
+ public This (Block block, Location loc)
+ {
+ this.loc = loc;
+ this.block = block;
+ }
+
+ public This (Location loc)
+ {
+ this.loc = loc;
+ }
+
+ public VariableInfo VariableInfo {
+ get { return variable_info; }
+ }
+
+ public bool VerifyFixed ()
+ {
+ return !TypeManager.IsValueType (Type);
+ }
+
+ public override bool IsRef {
+ get { return is_struct; }
+ }
+
+ public override Variable Variable {
+ get { return variable; }
+ }
+
+ public bool ResolveBase (EmitContext ec)
+ {
+ eclass = ExprClass.Variable;
+
+ if (ec.TypeContainer.CurrentType != null)
+ type = ec.TypeContainer.CurrentType;
+ else
+ type = ec.ContainerType;
+
+ is_struct = ec.TypeContainer is Struct;
+
+ if (ec.IsStatic) {
+ Error (26, "Keyword `this' is not valid in a static property, " +
+ "static method, or static field initializer");
+ return false;
+ }
+
+ if (block != null) {
+ if (block.Toplevel.ThisVariable != null)
+ variable_info = block.Toplevel.ThisVariable.VariableInfo;
+
+ AnonymousContainer am = ec.CurrentAnonymousMethod;
+ if (is_struct && (am != null) && !am.IsIterator) {
+ Report.Error (1673, loc, "Anonymous methods inside structs " +
+ "cannot access instance members of `this'. " +
+ "Consider copying `this' to a local variable " +
+ "outside the anonymous method and using the " +
+ "local instead.");
+ return false;
+ }
+
+ IAnonymousMethodHost host = block.Toplevel.AnonymousMethodHost;
+ if ((host != null) && (!is_struct || host.IsIterator)) {
+ variable = host.CaptureThis ();
+ type = variable.Type;
+ is_struct = false;
+ }
+ }
+
+ if (variable == null)
+ variable = new SimpleThis (type);
+
+ return true;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (!ResolveBase (ec))
+ return null;
+
+ if ((variable_info != null) && !(type.IsValueType && ec.OmitStructFlowAnalysis) &&
+ !variable_info.IsAssigned (ec)) {
+ Error (188, "The `this' object cannot be used before all of its " +
+ "fields are assigned to");
+ variable_info.SetAssigned (ec);
+ return this;
+ }
+
+ if (ec.IsFieldInitializer) {
+ Error (27, "Keyword `this' is not available in the current context");
+ return null;
+ }
+
+ return this;
+ }
+
+ override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ if (!ResolveBase (ec))
+ return null;
+
+ if (variable_info != null)
+ variable_info.SetAssigned (ec);
+
+ if (ec.TypeContainer is Class){
+ Error (1604, "Cannot assign to 'this' because it is read-only");
+ return null;
+ }
+
+ return this;
+ }
+ public override int GetHashCode()
+ {
+ return block.GetHashCode ();
+ }
+
+ public override bool Equals (object obj)
+ {
+ This t = obj as This;
+ if (t == null)
+ return false;
+
+ return block == t.block;
+ }
+
+ protected class SimpleThis : Variable
+ {
+ Type type;
+
+ public SimpleThis (Type type)
+ {
+ this.type = type;
+ }
+
+ public override Type Type {
+ get { return type; }
+ }
+
+ public override bool HasInstance {
+ get { return false; }
+ }
+
+ public override bool NeedsTemporary {
+ get { return false; }
+ }
+
+ public override void EmitInstance (EmitContext ec)
+ {
+ // Do nothing.
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldarg_0);
+ }
+
+ public override void EmitAssign (EmitContext ec)
+ {
+ throw new InvalidOperationException ();
+ }
+
+ public override void EmitAddressOf (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldarg_0);
+ }
+ }
+ }
+
+ /// <summary>
+ /// Represents the `__arglist' construct
+ /// </summary>
+ public class ArglistAccess : Expression
+ {
+ public ArglistAccess (Location loc)
+ {
+ this.loc = loc;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ eclass = ExprClass.Variable;
+ type = TypeManager.runtime_argument_handle_type;
+
+ if (ec.IsFieldInitializer || !ec.CurrentBlock.Toplevel.HasVarargs)
+ {
+ Error (190, "The __arglist construct is valid only within " +
+ "a variable argument method");
+ return null;
+ }
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Arglist);
+ }
+ }
+
+ /// <summary>
+ /// Represents the `__arglist (....)' construct
+ /// </summary>
+ public class Arglist : Expression
+ {
+ public readonly Argument[] Arguments;
+
+ public Arglist (Argument[] args, Location l)
+ {
+ Arguments = args;
+ loc = l;
+ }
+
+ public Type[] ArgumentTypes {
+ get {
+ Type[] retval = new Type [Arguments.Length];
+ for (int i = 0; i < Arguments.Length; i++)
+ retval [i] = Arguments [i].Type;
+ return retval;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ eclass = ExprClass.Variable;
+ type = TypeManager.runtime_argument_handle_type;
+
+ foreach (Argument arg in Arguments) {
+ if (!arg.Resolve (ec, loc))
+ return null;
+ }
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ foreach (Argument arg in Arguments)
+ arg.Emit (ec);
+ }
+ }
+
+ //
+ // This produces the value that renders an instance, used by the iterators code
+ //
+ public class ProxyInstance : Expression, IMemoryLocation {
+ public override Expression DoResolve (EmitContext ec)
+ {
+ eclass = ExprClass.Variable;
+ type = ec.ContainerType;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldarg_0);
+
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp mode)
+ {
+ ec.ig.Emit (OpCodes.Ldarg_0);
+ }
+ }
+
+ /// <summary>
+ /// Implements the typeof operator
+ /// </summary>
+ public class TypeOf : Expression {
+ readonly Expression QueriedType;
+ protected Type typearg;
+
+ public TypeOf (Expression queried_type, Location l)
+ {
+ QueriedType = queried_type;
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return null;
+
+ typearg = texpr.Type;
+
+ if (typearg == TypeManager.void_type) {
+ Error (673, "System.Void cannot be used from C#. Use typeof (void) to get the void type object");
+ return null;
+ }
+
+ if (typearg.IsPointer && !ec.InUnsafe){
+ UnsafeError (loc);
+ return null;
+ }
+
+ type = TypeManager.type_type;
+ // Even though what is returned is a type object, it's treated as a value by the compiler.
+ // In particular, 'typeof (Foo).X' is something totally different from 'Foo.X'.
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldtoken, typearg);
+ ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
+ }
+
+ public override bool GetAttributableValue (Type valueType, out object value)
+ {
+ if (TypeManager.ContainsGenericParameters (typearg)) {
+ Report.SymbolRelatedToPreviousError(typearg);
+ Report.Error(416, loc, "`{0}': an attribute argument cannot use type parameters",
+ TypeManager.CSharpName(typearg));
+ value = null;
+ return false;
+ }
+
+ if (valueType == TypeManager.object_type) {
+ value = (object)typearg;
+ return true;
+ }
+ value = typearg;
+ return true;
+ }
+
+ public Type TypeArgument
+ {
+ get
+ {
+ return typearg;
+ }
+ }
+ }
+
+ /// <summary>
+ /// Implements the `typeof (void)' operator
+ /// </summary>
+ public class TypeOfVoid : TypeOf {
+ public TypeOfVoid (Location l) : base (null, l)
+ {
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ type = TypeManager.type_type;
+ typearg = TypeManager.void_type;
+ // See description in TypeOf.
+ eclass = ExprClass.Value;
+ return this;
+ }
+ }
+
+ /// <summary>
+ /// Implements the sizeof expression
+ /// </summary>
+ public class SizeOf : Expression {
+ public Expression QueriedType;
+ Type type_queried;
+
+ public SizeOf (Expression queried_type, Location l)
+ {
+ this.QueriedType = queried_type;
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return null;
+
+#if GMCS_SOURCE
+ if (texpr is TypeParameterExpr){
+ ((TypeParameterExpr)texpr).Error_CannotUseAsUnmanagedType (loc);
+ return null;
+ }
+#endif
+
+ type_queried = texpr.Type;
+ if (type_queried.IsEnum)
+ type_queried = TypeManager.EnumToUnderlying (type_queried);
+
+ if (type_queried == TypeManager.void_type) {
+ Expression.Error_VoidInvalidInTheContext (loc);
+ return null;
+ }
+
+ int size_of = GetTypeSize (type_queried);
+ if (size_of > 0) {
+ return new IntConstant (size_of, loc);
+ }
+
+ if (!ec.InUnsafe) {
+ Report.Error (233, loc, "`{0}' does not have a predefined size, therefore sizeof can only be used in an unsafe context (consider using System.Runtime.InteropServices.Marshal.SizeOf)",
+ TypeManager.CSharpName (type_queried));
+ return null;
+ }
+
+ if (!TypeManager.VerifyUnManaged (type_queried, loc)){
+ return null;
+ }
+
+ type = TypeManager.int32_type;
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ int size = GetTypeSize (type_queried);
+
+ if (size == 0)
+ ec.ig.Emit (OpCodes.Sizeof, type_queried);
+ else
+ IntConstant.EmitInt (ec.ig, size);
+ }
+ }
+
+ /// <summary>
+ /// Implements the qualified-alias-member (::) expression.
+ /// </summary>
+ public class QualifiedAliasMember : Expression
+ {
+ string alias, identifier;
+
+ public QualifiedAliasMember (string alias, string identifier, Location l)
+ {
+ this.alias = alias;
+ this.identifier = identifier;
+ loc = l;
+ }
+
+ public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
+ {
+ if (alias == "global")
+ return new MemberAccess (RootNamespace.Global, identifier, loc).ResolveAsTypeStep (ec, silent);
+
+ int errors = Report.Errors;
+ FullNamedExpression fne = ec.DeclContainer.NamespaceEntry.LookupAlias (alias);
+ if (fne == null) {
+ if (errors == Report.Errors)
+ Report.Error (432, loc, "Alias `{0}' not found", alias);
+ return null;
+ }
+ if (fne.eclass != ExprClass.Namespace) {
+ if (!silent)
+ Report.Error (431, loc, "`{0}' cannot be used with '::' since it denotes a type", alias);
+ return null;
+ }
+ return new MemberAccess (fne, identifier).ResolveAsTypeStep (ec, silent);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ FullNamedExpression fne;
+ if (alias == "global") {
+ fne = RootNamespace.Global;
+ } else {
+ int errors = Report.Errors;
+ fne = ec.DeclContainer.NamespaceEntry.LookupAlias (alias);
+ if (fne == null) {
+ if (errors == Report.Errors)
+ Report.Error (432, loc, "Alias `{0}' not found", alias);
+ return null;
+ }
+ }
+
+ Expression retval = new MemberAccess (fne, identifier).DoResolve (ec);
+ if (retval == null)
+ return null;
+
+ if (!(retval is FullNamedExpression)) {
+ Report.Error (687, loc, "The expression `{0}::{1}' did not resolve to a namespace or a type", alias, identifier);
+ return null;
+ }
+
+ // We defer this check till the end to match the behaviour of CSC
+ if (fne.eclass != ExprClass.Namespace) {
+ Report.Error (431, loc, "`{0}' cannot be used with '::' since it denotes a type", alias);
+ return null;
+ }
+ return retval;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new InternalErrorException ("QualifiedAliasMember found in resolved tree");
+ }
+
+
+ public override string ToString ()
+ {
+ return alias + "::" + identifier;
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return ToString ();
+ }
+ }
+
+ /// <summary>
+ /// Implements the member access expression
+ /// </summary>
+ public class MemberAccess : Expression {
+ public readonly string Identifier;
+ Expression expr;
+
+ public MemberAccess (Expression expr, string id)
+ : this (expr, id, expr.Location)
+ {
+ }
+
+ public MemberAccess (Expression expr, string identifier, Location loc)
+ {
+ this.expr = expr;
+ Identifier = identifier;
+ this.loc = loc;
+ }
+
+ public MemberAccess (Expression expr, string identifier, TypeArguments args, Location loc)
+ : this (expr, identifier, loc)
+ {
+ this.args = args;
+ }
+
+ TypeArguments args;
+
+ public Expression Expr {
+ get { return expr; }
+ }
+
+ protected string LookupIdentifier {
+ get { return MemberName.MakeName (Identifier, args); }
+ }
+
+ // TODO: this method has very poor performace for Enum fields and
+ // probably for other constants as well
+ Expression DoResolve (EmitContext ec, Expression right_side)
+ {
+ if (type != null)
+ throw new Exception ();
+
+ //
+ // Resolve the expression with flow analysis turned off, we'll do the definite
+ // assignment checks later. This is because we don't know yet what the expression
+ // will resolve to - it may resolve to a FieldExpr and in this case we must do the
+ // definite assignment check on the actual field and not on the whole struct.
+ //
+
+ SimpleName original = expr as SimpleName;
+ Expression new_expr = expr.Resolve (ec,
+ ResolveFlags.VariableOrValue | ResolveFlags.Type |
+ ResolveFlags.Intermediate | ResolveFlags.DisableStructFlowAnalysis);
+
+ if (new_expr == null)
+ return null;
+
+ if (new_expr is Namespace) {
+ Namespace ns = (Namespace) new_expr;
+ FullNamedExpression retval = ns.Lookup (ec.DeclContainer, LookupIdentifier, loc);
+#if GMCS_SOURCE
+ if ((retval != null) && (args != null))
+ retval = new ConstructedType (retval, args, loc).ResolveAsTypeStep (ec, false);
+#endif
+
+ if (retval == null)
+ ns.Error_NamespaceDoesNotExist (ec.DeclContainer, loc, Identifier);
+ return retval;
+ }
+
+ Type expr_type = new_expr.Type;
+ if (expr_type.IsPointer || expr_type == TypeManager.void_type || new_expr is NullLiteral){
+ Unary.Error_OperatorCannotBeApplied (loc, ".", expr_type);
+ return null;
+ }
+ if (expr_type == TypeManager.anonymous_method_type){
+ Unary.Error_OperatorCannotBeApplied (loc, ".", "anonymous method");
+ return null;
+ }
+
+ Constant c = new_expr as Constant;
+ if (c != null && c.GetValue () == null) {
+ Report.Warning (1720, 1, loc, "Expression will always cause a `{0}'",
+ "System.NullReferenceException");
+ }
+
+ Expression member_lookup;
+ member_lookup = MemberLookup (
+ ec.ContainerType, expr_type, expr_type, Identifier, loc);
+#if GMCS_SOURCE
+ if ((member_lookup == null) && (args != null)) {
+ member_lookup = MemberLookup (
+ ec.ContainerType, expr_type, expr_type, LookupIdentifier, loc);
+ }
+#endif
+ if (member_lookup == null) {
+ MemberLookupFailed (
+ ec.ContainerType, expr_type, expr_type, Identifier, null, true, loc);
+ return null;
+ }
+
+ TypeExpr texpr = member_lookup as TypeExpr;
+ if (texpr != null) {
+ if (!(new_expr is TypeExpr) &&
+ (original == null || !original.IdenticalNameAndTypeName (ec, new_expr, loc))) {
+ Report.Error (572, loc, "`{0}': cannot reference a type through an expression; try `{1}' instead",
+ Identifier, member_lookup.GetSignatureForError ());
+ return null;
+ }
+
+ if (!texpr.CheckAccessLevel (ec.DeclContainer)) {
+ Report.SymbolRelatedToPreviousError (member_lookup.Type);
+ ErrorIsInaccesible (loc, TypeManager.CSharpName (member_lookup.Type));
+ return null;
+ }
+
+#if GMCS_SOURCE
+ ConstructedType ct = new_expr as ConstructedType;
+ if (ct != null) {
+ //
+ // When looking up a nested type in a generic instance
+ // via reflection, we always get a generic type definition
+ // and not a generic instance - so we have to do this here.
+ //
+ // See gtest-172-lib.cs and gtest-172.cs for an example.
+ //
+ ct = new ConstructedType (
+ member_lookup.Type, ct.TypeArguments, loc);
+
+ return ct.ResolveAsTypeStep (ec, false);
+ }
+#endif
+ return member_lookup;
+ }
+
+ MemberExpr me = (MemberExpr) member_lookup;
+ member_lookup = me.ResolveMemberAccess (ec, new_expr, loc, original);
+ if (member_lookup == null)
+ return null;
+
+ if (args != null) {
+ MethodGroupExpr mg = member_lookup as MethodGroupExpr;
+ if (mg == null)
+ throw new InternalErrorException ();
+
+ return mg.ResolveGeneric (ec, args);
+ }
+
+ if (original != null && !TypeManager.IsValueType (expr_type)) {
+ me = member_lookup as MemberExpr;
+ if (me != null && me.IsInstance) {
+ LocalVariableReference var = new_expr as LocalVariableReference;
+ if (var != null && !var.VerifyAssigned (ec))
+ return null;
+ }
+ }
+
+ // The following DoResolve/DoResolveLValue will do the definite assignment
+ // check.
+
+ if (right_side != null)
+ return member_lookup.DoResolveLValue (ec, right_side);
+ else
+ return member_lookup.DoResolve (ec);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return DoResolve (ec, null);
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ return DoResolve (ec, right_side);
+ }
+
+ public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
+ {
+ return ResolveNamespaceOrType (ec, silent);
+ }
+
+ public FullNamedExpression ResolveNamespaceOrType (IResolveContext rc, bool silent)
+ {
+ FullNamedExpression new_expr = expr.ResolveAsTypeStep (rc, silent);
+
+ if (new_expr == null)
+ return null;
+
+ if (new_expr is Namespace) {
+ Namespace ns = (Namespace) new_expr;
+ FullNamedExpression retval = ns.Lookup (rc.DeclContainer, LookupIdentifier, loc);
+#if GMCS_SOURCE
+ if ((retval != null) && (args != null))
+ retval = new ConstructedType (retval, args, loc).ResolveAsTypeStep (rc, false);
+#endif
+ if (!silent && retval == null)
+ ns.Error_NamespaceDoesNotExist (rc.DeclContainer, loc, LookupIdentifier);
+ return retval;
+ }
+
+ TypeExpr tnew_expr = new_expr.ResolveAsTypeTerminal (rc, false);
+ if (tnew_expr == null)
+ return null;
+
+ Type expr_type = tnew_expr.Type;
+
+ if (expr_type.IsPointer){
+ Error (23, "The `.' operator can not be applied to pointer operands (" +
+ TypeManager.CSharpName (expr_type) + ")");
+ return null;
+ }
+
+ Expression member_lookup = MemberLookup (
+ rc.DeclContainer.TypeBuilder, expr_type, expr_type, LookupIdentifier,
+ MemberTypes.NestedType, BindingFlags.Public | BindingFlags.NonPublic, loc);
+ if (member_lookup == null) {
+ if (silent)
+ return null;
+
+ member_lookup = MemberLookup(
+ rc.DeclContainer.TypeBuilder, expr_type, expr_type, LookupIdentifier,
+ MemberTypes.All, BindingFlags.Public | BindingFlags.NonPublic, loc);
+
+ if (member_lookup == null) {
+ Report.Error (426, loc, "The nested type `{0}' does not exist in the type `{1}'",
+ Identifier, new_expr.GetSignatureForError ());
+ } else {
+ // TODO: Report.SymbolRelatedToPreviousError
+ member_lookup.Error_UnexpectedKind (null, "type", loc);
+ }
+ return null;
+ }
+
+ TypeExpr texpr = member_lookup.ResolveAsTypeTerminal (rc, false);
+ if (texpr == null)
+ return null;
+
+#if GMCS_SOURCE
+ TypeArguments the_args = args;
+ if (TypeManager.HasGenericArguments (expr_type)) {
+ Type[] decl_args = TypeManager.GetTypeArguments (expr_type);
+
+ TypeArguments new_args = new TypeArguments (loc);
+ foreach (Type decl in decl_args)
+ new_args.Add (new TypeExpression (decl, loc));
+
+ if (args != null)
+ new_args.Add (args);
+
+ the_args = new_args;
+ }
+
+ if (the_args != null) {
+ ConstructedType ctype = new ConstructedType (texpr.Type, the_args, loc);
+ return ctype.ResolveAsTypeStep (rc, false);
+ }
+#endif
+
+ return texpr;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should not happen");
+ }
+
+ public override string ToString ()
+ {
+ return expr + "." + MemberName.MakeName (Identifier, args);
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return expr.GetSignatureForError () + "." + Identifier;
+ }
+ }
+
+ /// <summary>
+ /// Implements checked expressions
+ /// </summary>
+ public class CheckedExpr : Expression {
+
+ public Expression Expr;
+
+ public CheckedExpr (Expression e, Location l)
+ {
+ Expr = e;
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
+ Expr = Expr.Resolve (ec);
+
+ if (Expr == null)
+ return null;
+
+ if (Expr is Constant)
+ return Expr;
+
+ eclass = Expr.eclass;
+ type = Expr.Type;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
+ Expr.Emit (ec);
+ }
+
+ public override void EmitBranchable (EmitContext ec, Label target, bool onTrue)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
+ Expr.EmitBranchable (ec, target, onTrue);
+ }
+ }
+
+ /// <summary>
+ /// Implements the unchecked expression
+ /// </summary>
+ public class UnCheckedExpr : Expression {
+
+ public Expression Expr;
+
+ public UnCheckedExpr (Expression e, Location l)
+ {
+ Expr = e;
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
+ Expr = Expr.Resolve (ec);
+
+ if (Expr == null)
+ return null;
+
+ if (Expr is Constant)
+ return Expr;
+
+ eclass = Expr.eclass;
+ type = Expr.Type;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
+ Expr.Emit (ec);
+ }
+
+ public override void EmitBranchable (EmitContext ec, Label target, bool onTrue)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
+ Expr.EmitBranchable (ec, target, onTrue);
+ }
+ }
+
+ /// <summary>
+ /// An Element Access expression.
+ ///
+ /// During semantic analysis these are transformed into
+ /// IndexerAccess, ArrayAccess or a PointerArithmetic.
+ /// </summary>
+ public class ElementAccess : Expression {
+ public ArrayList Arguments;
+ public Expression Expr;
+
+ public ElementAccess (Expression e, ArrayList e_list)
+ {
+ Expr = e;
+
+ loc = e.Location;
+
+ if (e_list == null)
+ return;
+
+ Arguments = new ArrayList ();
+ foreach (Expression tmp in e_list)
+ Arguments.Add (new Argument (tmp, Argument.AType.Expression));
+
+ }
+
+ bool CommonResolve (EmitContext ec)
+ {
+ Expr = Expr.Resolve (ec);
+
+ if (Expr == null)
+ return false;
+
+ if (Arguments == null)
+ return false;
+
+ foreach (Argument a in Arguments){
+ if (!a.Resolve (ec, loc))
+ return false;
+ }
+
+ return true;
+ }
+
+ Expression MakePointerAccess (EmitContext ec, Type t)
+ {
+ if (t == TypeManager.void_ptr_type){
+ Error (242, "The array index operation is not valid on void pointers");
+ return null;
+ }
+ if (Arguments.Count != 1){
+ Error (196, "A pointer must be indexed by only one value");
+ return null;
+ }
+ Expression p;
+
+ p = new PointerArithmetic (true, Expr, ((Argument)Arguments [0]).Expr, t, loc).Resolve (ec);
+ if (p == null)
+ return null;
+ return new Indirection (p, loc).Resolve (ec);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (!CommonResolve (ec))
+ return null;
+
+ //
+ // We perform some simple tests, and then to "split" the emit and store
+ // code we create an instance of a different class, and return that.
+ //
+ // I am experimenting with this pattern.
+ //
+ Type t = Expr.Type;
+
+ if (t == TypeManager.array_type){
+ Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `System.Array'");
+ return null;
+ }
+
+ if (t.IsArray)
+ return (new ArrayAccess (this, loc)).Resolve (ec);
+ if (t.IsPointer)
+ return MakePointerAccess (ec, Expr.Type);
+
+ FieldExpr fe = Expr as FieldExpr;
+ if (fe != null) {
+ IFixedBuffer ff = AttributeTester.GetFixedBuffer (fe.FieldInfo);
+ if (ff != null) {
+ return MakePointerAccess (ec, ff.ElementType);
+ }
+ }
+ return (new IndexerAccess (this, loc)).Resolve (ec);
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ if (!CommonResolve (ec))
+ return null;
+
+ Type t = Expr.Type;
+ if (t.IsArray)
+ return (new ArrayAccess (this, loc)).DoResolveLValue (ec, right_side);
+
+ if (t.IsPointer)
+ return MakePointerAccess (ec, Expr.Type);
+
+ FieldExpr fe = Expr as FieldExpr;
+ if (fe != null) {
+ IFixedBuffer ff = AttributeTester.GetFixedBuffer (fe.FieldInfo);
+ if (ff != null) {
+ if (!(fe.InstanceExpression is LocalVariableReference) &&
+ !(fe.InstanceExpression is This)) {
+ Report.Error (1708, loc, "Fixed size buffers can only be accessed through locals or fields");
+ return null;
+ }
+ if (!ec.InFixedInitializer && ec.ContainerType.IsValueType) {
+ Error (1666, "You cannot use fixed size buffers contained in unfixed expressions. Try using the fixed statement");
+ return null;
+ }
+ return MakePointerAccess (ec, ff.ElementType);
+ }
+ }
+ return (new IndexerAccess (this, loc)).DoResolveLValue (ec, right_side);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should never be reached");
+ }
+ }
+
+ /// <summary>
+ /// Implements array access
+ /// </summary>
+ public class ArrayAccess : Expression, IAssignMethod, IMemoryLocation {
+ //
+ // Points to our "data" repository
+ //
+ ElementAccess ea;
+
+ LocalTemporary temp;
+ bool prepared;
+
+ public ArrayAccess (ElementAccess ea_data, Location l)
+ {
+ ea = ea_data;
+ eclass = ExprClass.Variable;
+ loc = l;
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ return DoResolve (ec);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+#if false
+ ExprClass eclass = ea.Expr.eclass;
+
+ // As long as the type is valid
+ if (!(eclass == ExprClass.Variable || eclass == ExprClass.PropertyAccess ||
+ eclass == ExprClass.Value)) {
+ ea.Expr.Error_UnexpectedKind ("variable or value");
+ return null;
+ }
+#endif
+
+ Type t = ea.Expr.Type;
+ if (t.GetArrayRank () != ea.Arguments.Count){
+ Report.Error (22, ea.Location, "Wrong number of indexes `{0}' inside [], expected `{1}'",
+ ea.Arguments.Count.ToString (), t.GetArrayRank ().ToString ());
+ return null;
+ }
+
+ type = TypeManager.GetElementType (t);
+ if (type.IsPointer && !ec.InUnsafe){
+ UnsafeError (ea.Location);
+ return null;
+ }
+
+ foreach (Argument a in ea.Arguments){
+ Type argtype = a.Type;
+
+ if (argtype == TypeManager.int32_type ||
+ argtype == TypeManager.uint32_type ||
+ argtype == TypeManager.int64_type ||
+ argtype == TypeManager.uint64_type) {
+ Constant c = a.Expr as Constant;
+ if (c != null && c.IsNegative) {
+ Report.Warning (251, 2, ea.Location, "Indexing an array with a negative index (array indices always start at zero)");
+ }
+ continue;
+ }
+
+ //
+ // Mhm. This is strage, because the Argument.Type is not the same as
+ // Argument.Expr.Type: the value changes depending on the ref/out setting.
+ //
+ // Wonder if I will run into trouble for this.
+ //
+ a.Expr = ExpressionToArrayArgument (ec, a.Expr, ea.Location);
+ if (a.Expr == null)
+ return null;
+ }
+
+ eclass = ExprClass.Variable;
+
+ return this;
+ }
+
+ /// <summary>
+ /// Emits the right opcode to load an object of Type `t'
+ /// from an array of T
+ /// </summary>
+ static public void EmitLoadOpcode (ILGenerator ig, Type type)
+ {
+ if (type == TypeManager.byte_type || type == TypeManager.bool_type)
+ ig.Emit (OpCodes.Ldelem_U1);
+ else if (type == TypeManager.sbyte_type)
+ ig.Emit (OpCodes.Ldelem_I1);
+ else if (type == TypeManager.short_type)
+ ig.Emit (OpCodes.Ldelem_I2);
+ else if (type == TypeManager.ushort_type || type == TypeManager.char_type)
+ ig.Emit (OpCodes.Ldelem_U2);
+ else if (type == TypeManager.int32_type)
+ ig.Emit (OpCodes.Ldelem_I4);
+ else if (type == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Ldelem_U4);
+ else if (type == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Ldelem_I8);
+ else if (type == TypeManager.int64_type)
+ ig.Emit (OpCodes.Ldelem_I8);
+ else if (type == TypeManager.float_type)
+ ig.Emit (OpCodes.Ldelem_R4);
+ else if (type == TypeManager.double_type)
+ ig.Emit (OpCodes.Ldelem_R8);
+ else if (type == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Ldelem_I);
+ else if (TypeManager.IsEnumType (type)){
+ EmitLoadOpcode (ig, TypeManager.EnumToUnderlying (type));
+ } else if (type.IsValueType){
+ ig.Emit (OpCodes.Ldelema, type);
+ ig.Emit (OpCodes.Ldobj, type);
+#if GMCS_SOURCE
+ } else if (type.IsGenericParameter) {
+#if MS_COMPATIBLE
+ ig.Emit (OpCodes.Ldelem, type);
+#else
+ ig.Emit (OpCodes.Ldelem_Any, type);
+#endif
+#endif
+ } else if (type.IsPointer)
+ ig.Emit (OpCodes.Ldelem_I);
+ else
+ ig.Emit (OpCodes.Ldelem_Ref);
+ }
+
+ /// <summary>
+ /// Returns the right opcode to store an object of Type `t'
+ /// from an array of T.
+ /// </summary>
+ static public OpCode GetStoreOpcode (Type t, out bool is_stobj, out bool has_type_arg)
+ {
+ //Console.WriteLine (new System.Diagnostics.StackTrace ());
+ has_type_arg = false; is_stobj = false;
+ t = TypeManager.TypeToCoreType (t);
+ if (TypeManager.IsEnumType (t))
+ t = TypeManager.EnumToUnderlying (t);
+ if (t == TypeManager.byte_type || t == TypeManager.sbyte_type ||
+ t == TypeManager.bool_type)
+ return OpCodes.Stelem_I1;
+ else if (t == TypeManager.short_type || t == TypeManager.ushort_type ||
+ t == TypeManager.char_type)
+ return OpCodes.Stelem_I2;
+ else if (t == TypeManager.int32_type || t == TypeManager.uint32_type)
+ return OpCodes.Stelem_I4;
+ else if (t == TypeManager.int64_type || t == TypeManager.uint64_type)
+ return OpCodes.Stelem_I8;
+ else if (t == TypeManager.float_type)
+ return OpCodes.Stelem_R4;
+ else if (t == TypeManager.double_type)
+ return OpCodes.Stelem_R8;
+ else if (t == TypeManager.intptr_type) {
+ has_type_arg = true;
+ is_stobj = true;
+ return OpCodes.Stobj;
+ } else if (t.IsValueType) {
+ has_type_arg = true;
+ is_stobj = true;
+ return OpCodes.Stobj;
+#if GMCS_SOURCE
+ } else if (t.IsGenericParameter) {
+ has_type_arg = true;
+#if MS_COMPATIBLE
+ return OpCodes.Stelem;
+#else
+ return OpCodes.Stelem_Any;
+#endif
+#endif
+
+ } else if (t.IsPointer)
+ return OpCodes.Stelem_I;
+ else
+ return OpCodes.Stelem_Ref;
+ }
+
+ MethodInfo FetchGetMethod ()
+ {
+ ModuleBuilder mb = CodeGen.Module.Builder;
+ int arg_count = ea.Arguments.Count;
+ Type [] args = new Type [arg_count];
+ MethodInfo get;
+
+ for (int i = 0; i < arg_count; i++){
+ //args [i++] = a.Type;
+ args [i] = TypeManager.int32_type;
+ }
+
+ get = mb.GetArrayMethod (
+ ea.Expr.Type, "Get",
+ CallingConventions.HasThis |
+ CallingConventions.Standard,
+ type, args);
+ return get;
+ }
+
+
+ MethodInfo FetchAddressMethod ()
+ {
+ ModuleBuilder mb = CodeGen.Module.Builder;
+ int arg_count = ea.Arguments.Count;
+ Type [] args = new Type [arg_count];
+ MethodInfo address;
+ Type ret_type;
+
+ ret_type = TypeManager.GetReferenceType (type);
+
+ for (int i = 0; i < arg_count; i++){
+ //args [i++] = a.Type;
+ args [i] = TypeManager.int32_type;
+ }
+
+ address = mb.GetArrayMethod (
+ ea.Expr.Type, "Address",
+ CallingConventions.HasThis |
+ CallingConventions.Standard,
+ ret_type, args);
+
+ return address;
+ }
+
+ //
+ // Load the array arguments into the stack.
+ //
+ // If we have been requested to cache the values (cached_locations array
+ // initialized), then load the arguments the first time and store them
+ // in locals. otherwise load from local variables.
+ //
+ void LoadArrayAndArguments (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ ea.Expr.Emit (ec);
+ foreach (Argument a in ea.Arguments){
+ Type argtype = a.Expr.Type;
+
+ a.Expr.Emit (ec);
+
+ if (argtype == TypeManager.int64_type)
+ ig.Emit (OpCodes.Conv_Ovf_I);
+ else if (argtype == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Conv_Ovf_I_Un);
+ }
+ }
+
+ public void Emit (EmitContext ec, bool leave_copy)
+ {
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+
+ if (!prepared) {
+ LoadArrayAndArguments (ec);
+
+ if (rank == 1)
+ EmitLoadOpcode (ig, type);
+ else {
+ MethodInfo method;
+
+ method = FetchGetMethod ();
+ ig.Emit (OpCodes.Call, method);
+ }
+ } else
+ LoadFromPtr (ec.ig, this.type);
+
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temp = new LocalTemporary (this.type);
+ temp.Store (ec);
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ Emit (ec, false);
+ }
+
+ public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
+ {
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+ Type t = source.Type;
+ prepared = prepare_for_load;
+
+ if (prepare_for_load) {
+ AddressOf (ec, AddressOp.LoadStore);
+ ec.ig.Emit (OpCodes.Dup);
+ source.Emit (ec);
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temp = new LocalTemporary (this.type);
+ temp.Store (ec);
+ }
+ StoreFromPtr (ec.ig, t);
+
+ if (temp != null) {
+ temp.Emit (ec);
+ temp.Release (ec);
+ }
+
+ return;
+ }
+
+ LoadArrayAndArguments (ec);
+
+ if (rank == 1) {
+ bool is_stobj, has_type_arg;
+ OpCode op = GetStoreOpcode (t, out is_stobj, out has_type_arg);
+ //
+ // The stobj opcode used by value types will need
+ // an address on the stack, not really an array/array
+ // pair
+ //
+ if (is_stobj)
+ ig.Emit (OpCodes.Ldelema, t);
+
+ source.Emit (ec);
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temp = new LocalTemporary (this.type);
+ temp.Store (ec);
+ }
+
+ if (is_stobj)
+ ig.Emit (OpCodes.Stobj, t);
+ else if (has_type_arg)
+ ig.Emit (op, t);
+ else
+ ig.Emit (op);
+ } else {
+ ModuleBuilder mb = CodeGen.Module.Builder;
+ int arg_count = ea.Arguments.Count;
+ Type [] args = new Type [arg_count + 1];
+ MethodInfo set;
+
+ source.Emit (ec);
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temp = new LocalTemporary (this.type);
+ temp.Store (ec);
+ }
+
+ for (int i = 0; i < arg_count; i++){
+ //args [i++] = a.Type;
+ args [i] = TypeManager.int32_type;
+ }
+
+ args [arg_count] = type;
+
+ set = mb.GetArrayMethod (
+ ea.Expr.Type, "Set",
+ CallingConventions.HasThis |
+ CallingConventions.Standard,
+ TypeManager.void_type, args);
+
+ ig.Emit (OpCodes.Call, set);
+ }
+
+ if (temp != null) {
+ temp.Emit (ec);
+ temp.Release (ec);
+ }
+ }
+
+ public void AddressOf (EmitContext ec, AddressOp mode)
+ {
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+
+ LoadArrayAndArguments (ec);
+
+ if (rank == 1){
+ ig.Emit (OpCodes.Ldelema, type);
+ } else {
+ MethodInfo address = FetchAddressMethod ();
+ ig.Emit (OpCodes.Call, address);
+ }
+ }
+
+ public void EmitGetLength (EmitContext ec, int dim)
+ {
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+
+ ea.Expr.Emit (ec);
+ if (rank == 1) {
+ ig.Emit (OpCodes.Ldlen);
+ ig.Emit (OpCodes.Conv_I4);
+ } else {
+ IntLiteral.EmitInt (ig, dim);
+ ig.Emit (OpCodes.Callvirt, TypeManager.int_getlength_int);
+ }
+ }
+ }
+
+ class Indexers {
+ // note that the ArrayList itself in mutable. We just can't assign to 'Properties' again.
+ public readonly ArrayList Properties;
+ static Indexers empty;
+
+ public struct Indexer {
+ public readonly PropertyInfo PropertyInfo;
+ public readonly MethodInfo Getter, Setter;
+
+ public Indexer (PropertyInfo property_info, MethodInfo get, MethodInfo set)
+ {
+ this.PropertyInfo = property_info;
+ this.Getter = get;
+ this.Setter = set;
+ }
+ }
+
+ static Indexers ()
+ {
+ empty = new Indexers (null);
+ }
+
+ Indexers (ArrayList array)
+ {
+ Properties = array;
+ }
+
+ static void Append (ref Indexers ix, Type caller_type, MemberInfo [] mi)
+ {
+ bool dummy;
+ if (mi == null)
+ return;
+ foreach (PropertyInfo property in mi){
+ MethodInfo get, set;
+
+ get = property.GetGetMethod (true);
+ set = property.GetSetMethod (true);
+ if (get != null && !Expression.IsAccessorAccessible (caller_type, get, out dummy))
+ get = null;
+ if (set != null && !Expression.IsAccessorAccessible (caller_type, set, out dummy))
+ set = null;
+ if (get != null || set != null) {
+ if (ix == empty)
+ ix = new Indexers (new ArrayList ());
+ ix.Properties.Add (new Indexer (property, get, set));
+ }
+ }
+ }
+
+ static private MemberInfo [] GetIndexersForTypeOrInterface (Type caller_type, Type lookup_type)
+ {
+ string p_name = TypeManager.IndexerPropertyName (lookup_type);
+
+ return TypeManager.MemberLookup (
+ caller_type, caller_type, lookup_type, MemberTypes.Property,
+ BindingFlags.Public | BindingFlags.Instance |
+ BindingFlags.DeclaredOnly, p_name, null);
+ }
+
+ static public Indexers GetIndexersForType (Type caller_type, Type lookup_type)
+ {
+ Indexers ix = empty;
+
+#if GMCS_SOURCE
+ if (lookup_type.IsGenericParameter) {
+ GenericConstraints gc = TypeManager.GetTypeParameterConstraints (lookup_type);
+ if (gc == null)
+ return empty;
+
+ if (gc.HasClassConstraint)
+ Append (ref ix, caller_type, GetIndexersForTypeOrInterface (caller_type, gc.ClassConstraint));
+
+ Type[] ifaces = gc.InterfaceConstraints;
+ foreach (Type itype in ifaces)
+ Append (ref ix, caller_type, GetIndexersForTypeOrInterface (caller_type, itype));
+
+ return ix;
+ }
+#endif
+
+ Type copy = lookup_type;
+ while (copy != TypeManager.object_type && copy != null){
+ Append (ref ix, caller_type, GetIndexersForTypeOrInterface (caller_type, copy));
+ copy = copy.BaseType;
+ }
+
+ if (lookup_type.IsInterface) {
+ Type [] ifaces = TypeManager.GetInterfaces (lookup_type);
+ if (ifaces != null) {
+ foreach (Type itype in ifaces)
+ Append (ref ix, caller_type, GetIndexersForTypeOrInterface (caller_type, itype));
+ }
+ }
+
+ return ix;
+ }
+ }
+
+ /// <summary>
+ /// Expressions that represent an indexer call.
+ /// </summary>
+ public class IndexerAccess : Expression, IAssignMethod {
+ //
+ // Points to our "data" repository
+ //
+ MethodInfo get, set;
+ ArrayList set_arguments;
+ bool is_base_indexer;
+
+ protected Type indexer_type;
+ protected Type current_type;
+ protected Expression instance_expr;
+ protected ArrayList arguments;
+
+ public IndexerAccess (ElementAccess ea, Location loc)
+ : this (ea.Expr, false, loc)
+ {
+ this.arguments = ea.Arguments;
+ }
+
+ protected IndexerAccess (Expression instance_expr, bool is_base_indexer,
+ Location loc)
+ {
+ this.instance_expr = instance_expr;
+ this.is_base_indexer = is_base_indexer;
+ this.eclass = ExprClass.Value;
+ this.loc = loc;
+ }
+
+ protected virtual bool CommonResolve (EmitContext ec)
+ {
+ indexer_type = instance_expr.Type;
+ current_type = ec.ContainerType;
+
+ return true;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (!CommonResolve (ec))
+ return null;
+
+ //
+ // Step 1: Query for all `Item' *properties*. Notice
+ // that the actual methods are pointed from here.
+ //
+ // This is a group of properties, piles of them.
+
+ ArrayList AllGetters = null;
+
+ Indexers ilist = Indexers.GetIndexersForType (current_type, indexer_type);
+ if (ilist.Properties != null) {
+ AllGetters = new ArrayList(ilist.Properties.Count);
+ foreach (Indexers.Indexer ix in ilist.Properties) {
+ if (ix.Getter != null)
+ AllGetters.Add (ix.Getter);
+ }
+ }
+
+ if (AllGetters == null) {
+ Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `{0}'",
+ TypeManager.CSharpName (indexer_type));
+ return null;
+ }
+
+ if (AllGetters.Count == 0) {
+ // FIXME: we cannot simply select first one as the error message is missleading when
+ // multiple indexers exist
+ Indexers.Indexer first_indexer = (Indexers.Indexer)ilist.Properties[ilist.Properties.Count - 1];
+ Report.Error (154, loc, "The property or indexer `{0}' cannot be used in this context because it lacks the `get' accessor",
+ TypeManager.GetFullNameSignature (first_indexer.PropertyInfo));
+ return null;
+ }
+
+ get = (MethodInfo)Invocation.OverloadResolve (ec, new MethodGroupExpr (AllGetters, loc),
+ arguments, false, loc);
+
+ if (get == null) {
+ Invocation.Error_WrongNumArguments (loc, "this", arguments.Count);
+ return null;
+ }
+
+ //
+ // Only base will allow this invocation to happen.
+ //
+ if (get.IsAbstract && this is BaseIndexerAccess){
+ Error_CannotCallAbstractBase (TypeManager.CSharpSignature (get));
+ return null;
+ }
+
+ type = get.ReturnType;
+ if (type.IsPointer && !ec.InUnsafe){
+ UnsafeError (loc);
+ return null;
+ }
+
+ instance_expr.CheckMarshalByRefAccess ();
+
+ eclass = ExprClass.IndexerAccess;
+ return this;
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ if (right_side == EmptyExpression.OutAccess) {
+ Report.Error (206, loc, "A property or indexer `{0}' may not be passed as an out or ref parameter",
+ GetSignatureForError ());
+ return null;
+ }
+
+ // if the indexer returns a value type, and we try to set a field in it
+ if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess) {
+ Report.Error (1612, loc, "Cannot modify the return value of `{0}' because it is not a variable",
+ GetSignatureForError ());
+ return null;
+ }
+
+ ArrayList AllSetters = new ArrayList();
+ if (!CommonResolve (ec))
+ return null;
+
+ bool found_any = false, found_any_setters = false;
+
+ Indexers ilist = Indexers.GetIndexersForType (current_type, indexer_type);
+ if (ilist.Properties != null) {
+ found_any = true;
+ foreach (Indexers.Indexer ix in ilist.Properties) {
+ if (ix.Setter != null)
+ AllSetters.Add (ix.Setter);
+ }
+ }
+ if (AllSetters.Count > 0) {
+ found_any_setters = true;
+ set_arguments = (ArrayList) arguments.Clone ();
+ set_arguments.Add (new Argument (right_side, Argument.AType.Expression));
+ set = (MethodInfo) Invocation.OverloadResolve (
+ ec, new MethodGroupExpr (AllSetters, loc),
+ set_arguments, false, loc);
+ }
+
+ if (!found_any) {
+ Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `{0}'",
+ TypeManager.CSharpName (indexer_type));
+ return null;
+ }
+
+ if (!found_any_setters) {
+ Error (154, "indexer can not be used in this context, because " +
+ "it lacks a `set' accessor");
+ return null;
+ }
+
+ if (set == null) {
+ Invocation.Error_WrongNumArguments (loc, "this", arguments.Count);
+ return null;
+ }
+
+ //
+ // Only base will allow this invocation to happen.
+ //
+ if (set.IsAbstract && this is BaseIndexerAccess){
+ Error_CannotCallAbstractBase (TypeManager.CSharpSignature (set));
+ return null;
+ }
+
+ //
+ // Now look for the actual match in the list of indexers to set our "return" type
+ //
+ type = TypeManager.void_type; // default value
+ foreach (Indexers.Indexer ix in ilist.Properties){
+ if (ix.Setter == set){
+ type = ix.PropertyInfo.PropertyType;
+ break;
+ }
+ }
+
+ instance_expr.CheckMarshalByRefAccess ();
+
+ eclass = ExprClass.IndexerAccess;
+ return this;
+ }
+
+ bool prepared = false;
+ LocalTemporary temp;
+
+ public void Emit (EmitContext ec, bool leave_copy)
+ {
+ Invocation.EmitCall (ec, is_base_indexer, false, instance_expr, get, arguments, loc, prepared, false);
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temp = new LocalTemporary (Type);
+ temp.Store (ec);
+ }
+ }
+
+ //
+ // source is ignored, because we already have a copy of it from the
+ // LValue resolution and we have already constructed a pre-cached
+ // version of the arguments (ea.set_arguments);
+ //
+ public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
+ {
+ prepared = prepare_for_load;
+ Argument a = (Argument) set_arguments [set_arguments.Count - 1];
+
+ if (prepared) {
+ source.Emit (ec);
+ if (leave_copy) {
+ ec.ig.Emit (OpCodes.Dup);
+ temp = new LocalTemporary (Type);
+ temp.Store (ec);
+ }
+ } else if (leave_copy) {
+ temp = new LocalTemporary (Type);
+ source.Emit (ec);
+ temp.Store (ec);
+ a.Expr = temp;
+ }
+
+ Invocation.EmitCall (ec, is_base_indexer, false, instance_expr, set, set_arguments, loc, false, prepared);
+
+ if (temp != null) {
+ temp.Emit (ec);
+ temp.Release (ec);
+ }
+ }
+
+
+ public override void Emit (EmitContext ec)
+ {
+ Emit (ec, false);
+ }
+
+ public override string GetSignatureForError ()
+ {
+ // FIXME: print the argument list of the indexer
+ return instance_expr.GetSignatureForError () + ".this[...]";
+ }
+ }
+
+ /// <summary>
+ /// The base operator for method names
+ /// </summary>
+ public class BaseAccess : Expression {
+ public readonly string Identifier;
+
+ public BaseAccess (string member, Location l)
+ {
+ this.Identifier = member;
+ loc = l;
+ }
+
+ public BaseAccess (string member, TypeArguments args, Location l)
+ : this (member, l)
+ {
+ this.args = args;
+ }
+
+ TypeArguments args;
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ Expression c = CommonResolve (ec);
+
+ if (c == null)
+ return null;
+
+ //
+ // MethodGroups use this opportunity to flag an error on lacking ()
+ //
+ if (!(c is MethodGroupExpr))
+ return c.Resolve (ec);
+ return c;
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ Expression c = CommonResolve (ec);
+
+ if (c == null)
+ return null;
+
+ //
+ // MethodGroups use this opportunity to flag an error on lacking ()
+ //
+ if (! (c is MethodGroupExpr))
+ return c.DoResolveLValue (ec, right_side);
+
+ return c;
+ }
+
+ Expression CommonResolve (EmitContext ec)
+ {
+ Expression member_lookup;
+ Type current_type = ec.ContainerType;
+ Type base_type = current_type.BaseType;
+
+ if (ec.IsStatic){
+ Error (1511, "Keyword `base' is not available in a static method");
+ return null;
+ }
+
+ if (ec.IsFieldInitializer){
+ Error (1512, "Keyword `base' is not available in the current context");
+ return null;
+ }
+
+ member_lookup = MemberLookup (ec.ContainerType, null, base_type, Identifier,
+ AllMemberTypes, AllBindingFlags, loc);
+ if (member_lookup == null) {
+ MemberLookupFailed (ec.ContainerType, base_type, base_type, Identifier, null, true, loc);
+ return null;
+ }
+
+ Expression left;
+
+ if (ec.IsStatic)
+ left = new TypeExpression (base_type, loc);
+ else
+ left = ec.GetThis (loc);
+
+ MemberExpr me = (MemberExpr) member_lookup;
+
+ Expression e = me.ResolveMemberAccess (ec, left, loc, null);
+
+ if (e is PropertyExpr) {
+ PropertyExpr pe = (PropertyExpr) e;
+
+ pe.IsBase = true;
+ }
+
+ MethodGroupExpr mg = e as MethodGroupExpr;
+ if (mg != null)
+ mg.IsBase = true;
+
+ if (args != null) {
+ if (mg != null)
+ return mg.ResolveGeneric (ec, args);
+
+ Report.Error (307, loc, "`{0}' cannot be used with type arguments",
+ Identifier);
+ return null;
+ }
+
+ return e;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should never be called");
+ }
+ }
+
+ /// <summary>
+ /// The base indexer operator
+ /// </summary>
+ public class BaseIndexerAccess : IndexerAccess {
+ public BaseIndexerAccess (ArrayList args, Location loc)
+ : base (null, true, loc)
+ {
+ arguments = new ArrayList ();
+ foreach (Expression tmp in args)
+ arguments.Add (new Argument (tmp, Argument.AType.Expression));
+ }
+
+ protected override bool CommonResolve (EmitContext ec)
+ {
+ instance_expr = ec.GetThis (loc);
+
+ current_type = ec.ContainerType.BaseType;
+ indexer_type = current_type;
+
+ foreach (Argument a in arguments){
+ if (!a.Resolve (ec, loc))
+ return false;
+ }
+
+ return true;
+ }
+ }
+
+ /// <summary>
+ /// This class exists solely to pass the Type around and to be a dummy
+ /// that can be passed to the conversion functions (this is used by
+ /// foreach implementation to typecast the object return value from
+ /// get_Current into the proper type. All code has been generated and
+ /// we only care about the side effect conversions to be performed
+ ///
+ /// This is also now used as a placeholder where a no-action expression
+ /// is needed (the `New' class).
+ /// </summary>
+ public class EmptyExpression : Expression {
+ public static readonly EmptyExpression Null = new EmptyExpression ();
+
+ public static readonly EmptyExpression OutAccess = new EmptyExpression ();
+ public static readonly EmptyExpression LValueMemberAccess = new EmptyExpression ();
+ public static readonly EmptyExpression LValueMemberOutAccess = new EmptyExpression ();
+
+ static EmptyExpression temp = new EmptyExpression ();
+ public static EmptyExpression Grab ()
+ {
+ EmptyExpression retval = temp == null ? new EmptyExpression () : temp;
+ temp = null;
+ return retval;
+ }
+
+ public static void Release (EmptyExpression e)
+ {
+ temp = e;
+ }
+
+ // TODO: should be protected
+ public EmptyExpression ()
+ {
+ type = TypeManager.object_type;
+ eclass = ExprClass.Value;
+ loc = Location.Null;
+ }
+
+ public EmptyExpression (Type t)
+ {
+ type = t;
+ eclass = ExprClass.Value;
+ loc = Location.Null;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ // nothing, as we only exist to not do anything.
+ }
+
+ //
+ // This is just because we might want to reuse this bad boy
+ // instead of creating gazillions of EmptyExpressions.
+ // (CanImplicitConversion uses it)
+ //
+ public void SetType (Type t)
+ {
+ type = t;
+ }
+ }
+
+ public class UserCast : Expression {
+ MethodBase method;
+ Expression source;
+
+ public UserCast (MethodInfo method, Expression source, Location l)
+ {
+ this.method = method;
+ this.source = source;
+ type = method.ReturnType;
+ eclass = ExprClass.Value;
+ loc = l;
+ }
+
+ public Expression Source {
+ get {
+ return source;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // We are born fully resolved
+ //
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ source.Emit (ec);
+
+ if (method is MethodInfo)
+ ig.Emit (OpCodes.Call, (MethodInfo) method);
+ else
+ ig.Emit (OpCodes.Call, (ConstructorInfo) method);
+
+ }
+ }
+
+ // <summary>
+ // This class is used to "construct" the type during a typecast
+ // operation. Since the Type.GetType class in .NET can parse
+ // the type specification, we just use this to construct the type
+ // one bit at a time.
+ // </summary>
+ public class ComposedCast : TypeExpr {
+ Expression left;
+ string dim;
+
+ public ComposedCast (Expression left, string dim)
+ : this (left, dim, left.Location)
+ {
+ }
+
+ public ComposedCast (Expression left, string dim, Location l)
+ {
+ this.left = left;
+ this.dim = dim;
+ loc = l;
+ }
+
+#if GMCS_SOURCE
+ public Expression RemoveNullable ()
+ {
+ if (dim.EndsWith ("?")) {
+ dim = dim.Substring (0, dim.Length - 1);
+ if (dim == "")
+ return left;
+ }
+
+ return this;
+ }
+#endif
+
+ protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
+ {
+ TypeExpr lexpr = left.ResolveAsTypeTerminal (ec, false);
+ if (lexpr == null)
+ return null;
+
+ Type ltype = lexpr.Type;
+ if ((ltype == TypeManager.void_type) && (dim != "*")) {
+ Error_VoidInvalidInTheContext (loc);
+ return null;
+ }
+
+#if GMCS_SOURCE
+ if ((dim.Length > 0) && (dim [0] == '?')) {
+ TypeExpr nullable = new NullableType (left, loc);
+ if (dim.Length > 1)
+ nullable = new ComposedCast (nullable, dim.Substring (1), loc);
+ return nullable.ResolveAsTypeTerminal (ec, false);
+ }
+#endif
+
+ if (dim == "*" && !TypeManager.VerifyUnManaged (ltype, loc))
+ return null;
+
+ if (dim != "" && dim [0] == '[' &&
+ (ltype == TypeManager.arg_iterator_type || ltype == TypeManager.typed_reference_type)) {
+ Report.Error (611, loc, "Array elements cannot be of type `{0}'", TypeManager.CSharpName (ltype));
+ return null;
+ }
+
+ if (dim != "")
+ type = TypeManager.GetConstructedType (ltype, dim);
+ else
+ type = ltype;
+
+ if (type == null)
+ throw new InternalErrorException ("Couldn't create computed type " + ltype + dim);
+
+ if (type.IsPointer && !ec.IsInUnsafeScope){
+ UnsafeError (loc);
+ return null;
+ }
+
+ eclass = ExprClass.Type;
+ return this;
+ }
+
+ public override string Name {
+ get { return left + dim; }
+ }
+
+ public override string FullName {
+ get { return type.FullName; }
+ }
+
+ public override string GetSignatureForError ()
+ {
+ return left.GetSignatureForError () + dim;
+ }
+ }
+
+ public class FixedBufferPtr : Expression {
+ Expression array;
+
+ public FixedBufferPtr (Expression array, Type array_type, Location l)
+ {
+ this.array = array;
+ this.loc = l;
+
+ type = TypeManager.GetPointerType (array_type);
+ eclass = ExprClass.Value;
+ }
+
+ public override void Emit(EmitContext ec)
+ {
+ array.Emit (ec);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // We are born fully resolved
+ //
+ return this;
+ }
+ }
+
+
+ //
+ // This class is used to represent the address of an array, used
+ // only by the Fixed statement, this generates "&a [0]" construct
+ // for fixed (char *pa = a)
+ //
+ public class ArrayPtr : FixedBufferPtr {
+ Type array_type;
+
+ public ArrayPtr (Expression array, Type array_type, Location l):
+ base (array, array_type, l)
+ {
+ this.array_type = array_type;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ base.Emit (ec);
+
+ ILGenerator ig = ec.ig;
+ IntLiteral.EmitInt (ig, 0);
+ ig.Emit (OpCodes.Ldelema, array_type);
+ }
+ }
+
+ //
+ // Used by the fixed statement
+ //
+ public class StringPtr : Expression {
+ LocalBuilder b;
+
+ public StringPtr (LocalBuilder b, Location l)
+ {
+ this.b = b;
+ eclass = ExprClass.Value;
+ type = TypeManager.char_ptr_type;
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ // This should never be invoked, we are born in fully
+ // initialized state.
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ ig.Emit (OpCodes.Ldloc, b);
+ ig.Emit (OpCodes.Conv_I);
+ ig.Emit (OpCodes.Call, TypeManager.int_get_offset_to_string_data);
+ ig.Emit (OpCodes.Add);
+ }
+ }
+
+ //
+ // Implements the `stackalloc' keyword
+ //
+ public class StackAlloc : Expression {
+ Type otype;
+ Expression t;
+ Expression count;
+
+ public StackAlloc (Expression type, Expression count, Location l)
+ {
+ t = type;
+ this.count = count;
+ loc = l;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ count = count.Resolve (ec);
+ if (count == null)
+ return null;
+
+ if (count.Type != TypeManager.int32_type){
+ count = Convert.ImplicitConversionRequired (ec, count, TypeManager.int32_type, loc);
+ if (count == null)
+ return null;
+ }
+
+ Constant c = count as Constant;
+ if (c != null && c.IsNegative) {
+ Report.Error (247, loc, "Cannot use a negative size with stackalloc");
+ return null;
+ }
+
+ if (ec.InCatch || ec.InFinally) {
+ Error (255, "Cannot use stackalloc in finally or catch");
+ return null;
+ }
+
+ TypeExpr texpr = t.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return null;
+
+ otype = texpr.Type;
+
+ if (!TypeManager.VerifyUnManaged (otype, loc))
+ return null;
+
+ type = TypeManager.GetPointerType (otype);
+ eclass = ExprClass.Value;
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ int size = GetTypeSize (otype);
+ ILGenerator ig = ec.ig;
+
+ if (size == 0)
+ ig.Emit (OpCodes.Sizeof, otype);
+ else
+ IntConstant.EmitInt (ig, size);
+ count.Emit (ec);
+ ig.Emit (OpCodes.Mul);
+ ig.Emit (OpCodes.Localloc);
+ }
+ }
+}
--- /dev/null
+//
+// statement.cs: Statement representation for the IL tree.
+//
+// Author:
+// Miguel de Icaza (miguel@ximian.com)
+// Martin Baulig (martin@ximian.com)
+// Marek Safar (marek.safar@seznam.cz)
+//
+// (C) 2001, 2002, 2003 Ximian, Inc.
+// (C) 2003, 2004 Novell, Inc.
+//
+
+using System;
+using System.Text;
+using System.Reflection;
+using System.Reflection.Emit;
+using System.Diagnostics;
+using System.Collections;
+using System.Collections.Specialized;
+
+namespace Mono.CSharp {
+
+ public abstract class Statement {
+ public Location loc;
+
+ /// <summary>
+ /// Resolves the statement, true means that all sub-statements
+ /// did resolve ok.
+ // </summary>
+ public virtual bool Resolve (EmitContext ec)
+ {
+ return true;
+ }
+
+ /// <summary>
+ /// We already know that the statement is unreachable, but we still
+ /// need to resolve it to catch errors.
+ /// </summary>
+ public virtual bool ResolveUnreachable (EmitContext ec, bool warn)
+ {
+ //
+ // This conflicts with csc's way of doing this, but IMHO it's
+ // the right thing to do.
+ //
+ // If something is unreachable, we still check whether it's
+ // correct. This means that you cannot use unassigned variables
+ // in unreachable code, for instance.
+ //
+
+ if (warn)
+ Report.Warning (162, 2, loc, "Unreachable code detected");
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Block, loc);
+ bool ok = Resolve (ec);
+ ec.KillFlowBranching ();
+
+ return ok;
+ }
+
+ /// <summary>
+ /// Return value indicates whether all code paths emitted return.
+ /// </summary>
+ protected abstract void DoEmit (EmitContext ec);
+
+ /// <summary>
+ /// Utility wrapper routine for Error, just to beautify the code
+ /// </summary>
+ public void Error (int error, string format, params object[] args)
+ {
+ Error (error, String.Format (format, args));
+ }
+
+ public void Error (int error, string s)
+ {
+ if (!loc.IsNull)
+ Report.Error (error, loc, s);
+ else
+ Report.Error (error, s);
+ }
+
+ /// <summary>
+ /// Return value indicates whether all code paths emitted return.
+ /// </summary>
+ public virtual void Emit (EmitContext ec)
+ {
+ ec.Mark (loc, true);
+ DoEmit (ec);
+ }
+ }
+
+ public sealed class EmptyStatement : Statement {
+
+ private EmptyStatement () {}
+
+ public static readonly EmptyStatement Value = new EmptyStatement ();
+
+ public override bool Resolve (EmitContext ec)
+ {
+ return true;
+ }
+
+ public override bool ResolveUnreachable (EmitContext ec, bool warn)
+ {
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ }
+ }
+
+ public class If : Statement {
+ Expression expr;
+ public Statement TrueStatement;
+ public Statement FalseStatement;
+
+ bool is_true_ret;
+
+ public If (Expression expr, Statement trueStatement, Location l)
+ {
+ this.expr = expr;
+ TrueStatement = trueStatement;
+ loc = l;
+ }
+
+ public If (Expression expr,
+ Statement trueStatement,
+ Statement falseStatement,
+ Location l)
+ {
+ this.expr = expr;
+ TrueStatement = trueStatement;
+ FalseStatement = falseStatement;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ bool ok = true;
+
+ Report.Debug (1, "START IF BLOCK", loc);
+
+ expr = Expression.ResolveBoolean (ec, expr, loc);
+ if (expr == null){
+ ok = false;
+ goto skip;
+ }
+
+ Assign ass = expr as Assign;
+ if (ass != null && ass.Source is Constant) {
+ Report.Warning (665, 3, loc, "Assignment in conditional expression is always constant; did you mean to use == instead of = ?");
+ }
+
+ //
+ // Dead code elimination
+ //
+ if (expr is BoolConstant){
+ bool take = ((BoolConstant) expr).Value;
+
+ if (take){
+ if (!TrueStatement.Resolve (ec))
+ return false;
+
+ if ((FalseStatement != null) &&
+ !FalseStatement.ResolveUnreachable (ec, true))
+ return false;
+ FalseStatement = null;
+ } else {
+ if (!TrueStatement.ResolveUnreachable (ec, true))
+ return false;
+ TrueStatement = null;
+
+ if ((FalseStatement != null) &&
+ !FalseStatement.Resolve (ec))
+ return false;
+ }
+
+ return true;
+ }
+ skip:
+ ec.StartFlowBranching (FlowBranching.BranchingType.Conditional, loc);
+
+ ok &= TrueStatement.Resolve (ec);
+
+ is_true_ret = ec.CurrentBranching.CurrentUsageVector.Reachability.IsUnreachable;
+
+ ec.CurrentBranching.CreateSibling ();
+
+ if (FalseStatement != null)
+ ok &= FalseStatement.Resolve (ec);
+
+ ec.EndFlowBranching ();
+
+ Report.Debug (1, "END IF BLOCK", loc);
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ Label false_target = ig.DefineLabel ();
+ Label end;
+
+ //
+ // If we're a boolean expression, Resolve() already
+ // eliminated dead code for us.
+ //
+ if (expr is BoolConstant){
+ bool take = ((BoolConstant) expr).Value;
+
+ if (take)
+ TrueStatement.Emit (ec);
+ else if (FalseStatement != null)
+ FalseStatement.Emit (ec);
+
+ return;
+ }
+
+ expr.EmitBranchable (ec, false_target, false);
+
+ TrueStatement.Emit (ec);
+
+ if (FalseStatement != null){
+ bool branch_emitted = false;
+
+ end = ig.DefineLabel ();
+ if (!is_true_ret){
+ ig.Emit (OpCodes.Br, end);
+ branch_emitted = true;
+ }
+
+ ig.MarkLabel (false_target);
+ FalseStatement.Emit (ec);
+
+ if (branch_emitted)
+ ig.MarkLabel (end);
+ } else {
+ ig.MarkLabel (false_target);
+ }
+ }
+ }
+
+ public class Do : Statement {
+ public Expression expr;
+ public readonly Statement EmbeddedStatement;
+ bool infinite;
+
+ public Do (Statement statement, Expression boolExpr, Location l)
+ {
+ expr = boolExpr;
+ EmbeddedStatement = statement;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ bool ok = true;
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Loop, loc);
+
+ bool was_unreachable = ec.CurrentBranching.CurrentUsageVector.Reachability.IsUnreachable;
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Embedded, loc);
+ if (!EmbeddedStatement.Resolve (ec))
+ ok = false;
+ ec.EndFlowBranching ();
+
+ if (ec.CurrentBranching.CurrentUsageVector.Reachability.IsUnreachable && !was_unreachable)
+ Report.Warning (162, 2, expr.Location, "Unreachable code detected");
+
+ expr = Expression.ResolveBoolean (ec, expr, loc);
+ if (expr == null)
+ ok = false;
+ else if (expr is BoolConstant){
+ bool res = ((BoolConstant) expr).Value;
+
+ if (res)
+ infinite = true;
+ }
+ if (infinite)
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+
+ ec.EndFlowBranching ();
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ Label loop = ig.DefineLabel ();
+ Label old_begin = ec.LoopBegin;
+ Label old_end = ec.LoopEnd;
+
+ ec.LoopBegin = ig.DefineLabel ();
+ ec.LoopEnd = ig.DefineLabel ();
+
+ ig.MarkLabel (loop);
+ EmbeddedStatement.Emit (ec);
+ ig.MarkLabel (ec.LoopBegin);
+
+ //
+ // Dead code elimination
+ //
+ if (expr is BoolConstant){
+ bool res = ((BoolConstant) expr).Value;
+
+ if (res)
+ ec.ig.Emit (OpCodes.Br, loop);
+ } else
+ expr.EmitBranchable (ec, loop, true);
+
+ ig.MarkLabel (ec.LoopEnd);
+
+ ec.LoopBegin = old_begin;
+ ec.LoopEnd = old_end;
+ }
+ }
+
+ public class While : Statement {
+ public Expression expr;
+ public readonly Statement Statement;
+ bool infinite, empty;
+
+ public While (Expression boolExpr, Statement statement, Location l)
+ {
+ this.expr = boolExpr;
+ Statement = statement;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ bool ok = true;
+
+ expr = Expression.ResolveBoolean (ec, expr, loc);
+ if (expr == null)
+ return false;
+
+ //
+ // Inform whether we are infinite or not
+ //
+ if (expr is BoolConstant){
+ BoolConstant bc = (BoolConstant) expr;
+
+ if (bc.Value == false){
+ if (!Statement.ResolveUnreachable (ec, true))
+ return false;
+ empty = true;
+ return true;
+ } else
+ infinite = true;
+ }
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Loop, loc);
+ if (!infinite)
+ ec.CurrentBranching.CreateSibling ();
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Embedded, loc);
+ if (!Statement.Resolve (ec))
+ ok = false;
+ ec.EndFlowBranching ();
+
+ // There's no direct control flow from the end of the embedded statement to the end of the loop
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+
+ ec.EndFlowBranching ();
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (empty)
+ return;
+
+ ILGenerator ig = ec.ig;
+ Label old_begin = ec.LoopBegin;
+ Label old_end = ec.LoopEnd;
+
+ ec.LoopBegin = ig.DefineLabel ();
+ ec.LoopEnd = ig.DefineLabel ();
+
+ //
+ // Inform whether we are infinite or not
+ //
+ if (expr is BoolConstant){
+ ig.MarkLabel (ec.LoopBegin);
+ Statement.Emit (ec);
+ ig.Emit (OpCodes.Br, ec.LoopBegin);
+
+ //
+ // Inform that we are infinite (ie, `we return'), only
+ // if we do not `break' inside the code.
+ //
+ ig.MarkLabel (ec.LoopEnd);
+ } else {
+ Label while_loop = ig.DefineLabel ();
+
+ ig.Emit (OpCodes.Br, ec.LoopBegin);
+ ig.MarkLabel (while_loop);
+
+ Statement.Emit (ec);
+
+ ig.MarkLabel (ec.LoopBegin);
+
+ expr.EmitBranchable (ec, while_loop, true);
+
+ ig.MarkLabel (ec.LoopEnd);
+ }
+
+ ec.LoopBegin = old_begin;
+ ec.LoopEnd = old_end;
+ }
+ }
+
+ public class For : Statement {
+ Expression Test;
+ readonly Statement InitStatement;
+ readonly Statement Increment;
+ public readonly Statement Statement;
+ bool infinite, empty;
+
+ public For (Statement initStatement,
+ Expression test,
+ Statement increment,
+ Statement statement,
+ Location l)
+ {
+ InitStatement = initStatement;
+ Test = test;
+ Increment = increment;
+ Statement = statement;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ bool ok = true;
+
+ if (InitStatement != null){
+ if (!InitStatement.Resolve (ec))
+ ok = false;
+ }
+
+ if (Test != null){
+ Test = Expression.ResolveBoolean (ec, Test, loc);
+ if (Test == null)
+ ok = false;
+ else if (Test is BoolConstant){
+ BoolConstant bc = (BoolConstant) Test;
+
+ if (bc.Value == false){
+ if (!Statement.ResolveUnreachable (ec, true))
+ return false;
+ if ((Increment != null) &&
+ !Increment.ResolveUnreachable (ec, false))
+ return false;
+ empty = true;
+ return true;
+ } else
+ infinite = true;
+ }
+ } else
+ infinite = true;
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Loop, loc);
+ if (!infinite)
+ ec.CurrentBranching.CreateSibling ();
+
+ bool was_unreachable = ec.CurrentBranching.CurrentUsageVector.Reachability.IsUnreachable;
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Embedded, loc);
+ if (!Statement.Resolve (ec))
+ ok = false;
+ ec.EndFlowBranching ();
+
+ if (Increment != null){
+ if (ec.CurrentBranching.CurrentUsageVector.Reachability.IsUnreachable) {
+ if (!Increment.ResolveUnreachable (ec, !was_unreachable))
+ ok = false;
+ } else {
+ if (!Increment.Resolve (ec))
+ ok = false;
+ }
+ }
+
+ // There's no direct control flow from the end of the embedded statement to the end of the loop
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+
+ ec.EndFlowBranching ();
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (empty)
+ return;
+
+ ILGenerator ig = ec.ig;
+ Label old_begin = ec.LoopBegin;
+ Label old_end = ec.LoopEnd;
+ Label loop = ig.DefineLabel ();
+ Label test = ig.DefineLabel ();
+
+ if (InitStatement != null && InitStatement != EmptyStatement.Value)
+ InitStatement.Emit (ec);
+
+ ec.LoopBegin = ig.DefineLabel ();
+ ec.LoopEnd = ig.DefineLabel ();
+
+ ig.Emit (OpCodes.Br, test);
+ ig.MarkLabel (loop);
+ Statement.Emit (ec);
+
+ ig.MarkLabel (ec.LoopBegin);
+ if (Increment != EmptyStatement.Value)
+ Increment.Emit (ec);
+
+ ig.MarkLabel (test);
+ //
+ // If test is null, there is no test, and we are just
+ // an infinite loop
+ //
+ if (Test != null){
+ //
+ // The Resolve code already catches the case for
+ // Test == BoolConstant (false) so we know that
+ // this is true
+ //
+ if (Test is BoolConstant)
+ ig.Emit (OpCodes.Br, loop);
+ else
+ Test.EmitBranchable (ec, loop, true);
+
+ } else
+ ig.Emit (OpCodes.Br, loop);
+ ig.MarkLabel (ec.LoopEnd);
+
+ ec.LoopBegin = old_begin;
+ ec.LoopEnd = old_end;
+ }
+ }
+
+ public class StatementExpression : Statement {
+ ExpressionStatement expr;
+
+ public StatementExpression (ExpressionStatement expr)
+ {
+ this.expr = expr;
+ loc = expr.Location;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ if (expr != null)
+ expr = expr.ResolveStatement (ec);
+ return expr != null;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ expr.EmitStatement (ec);
+ }
+
+ public override string ToString ()
+ {
+ return "StatementExpression (" + expr + ")";
+ }
+ }
+
+ /// <summary>
+ /// Implements the return statement
+ /// </summary>
+ public class Return : Statement {
+ public Expression Expr;
+
+ public Return (Expression expr, Location l)
+ {
+ Expr = expr;
+ loc = l;
+ }
+
+ bool unwind_protect;
+
+ public override bool Resolve (EmitContext ec)
+ {
+ AnonymousContainer am = ec.CurrentAnonymousMethod;
+ if ((am != null) && am.IsIterator && ec.InIterator) {
+ Report.Error (1622, loc, "Cannot return a value from iterators. Use the yield return " +
+ "statement to return a value, or yield break to end the iteration");
+ return false;
+ }
+
+ if (ec.ReturnType == null){
+ if (Expr != null){
+ if (ec.CurrentAnonymousMethod != null){
+ Report.Error (1662, loc,
+ "Cannot convert anonymous method block to delegate type `{0}' because some of the return types in the block are not implicitly convertible to the delegate return type",
+ ec.CurrentAnonymousMethod.GetSignatureForError ());
+ }
+ Error (127, "A return keyword must not be followed by any expression when method returns void");
+ return false;
+ }
+ } else {
+ if (Expr == null){
+ Error (126, "An object of a type convertible to `{0}' is required " +
+ "for the return statement",
+ TypeManager.CSharpName (ec.ReturnType));
+ return false;
+ }
+
+ Expr = Expr.Resolve (ec);
+ if (Expr == null)
+ return false;
+
+ if (Expr.Type != ec.ReturnType) {
+ Expr = Convert.ImplicitConversionRequired (
+ ec, Expr, ec.ReturnType, loc);
+ if (Expr == null)
+ return false;
+ }
+ }
+
+ int errors = Report.Errors;
+ unwind_protect = ec.CurrentBranching.AddReturnOrigin (ec.CurrentBranching.CurrentUsageVector, loc);
+ if (unwind_protect)
+ ec.NeedReturnLabel ();
+ ec.CurrentBranching.CurrentUsageVector.Return ();
+ return errors == Report.Errors;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (Expr != null) {
+ Expr.Emit (ec);
+
+ if (unwind_protect)
+ ec.ig.Emit (OpCodes.Stloc, ec.TemporaryReturn ());
+ }
+
+ if (unwind_protect)
+ ec.ig.Emit (OpCodes.Leave, ec.ReturnLabel);
+ else
+ ec.ig.Emit (OpCodes.Ret);
+ }
+ }
+
+ public class Goto : Statement {
+ string target;
+ LabeledStatement label;
+ bool unwind_protect;
+
+ public override bool Resolve (EmitContext ec)
+ {
+ int errors = Report.Errors;
+ unwind_protect = ec.CurrentBranching.AddGotoOrigin (ec.CurrentBranching.CurrentUsageVector, this);
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+ return errors == Report.Errors;
+ }
+
+ public Goto (string label, Location l)
+ {
+ loc = l;
+ target = label;
+ }
+
+ public string Target {
+ get { return target; }
+ }
+
+ public void SetResolvedTarget (LabeledStatement label)
+ {
+ this.label = label;
+ label.AddReference ();
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (label == null)
+ throw new InternalErrorException ("goto emitted before target resolved");
+ Label l = label.LabelTarget (ec);
+ ec.ig.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, l);
+ }
+ }
+
+ public class LabeledStatement : Statement {
+ string name;
+ bool defined;
+ bool referenced;
+ Label label;
+ ILGenerator ig;
+
+ FlowBranching.UsageVector vectors;
+
+ public LabeledStatement (string name, Location l)
+ {
+ this.name = name;
+ this.loc = l;
+ }
+
+ public Label LabelTarget (EmitContext ec)
+ {
+ if (defined)
+ return label;
+ ig = ec.ig;
+ label = ec.ig.DefineLabel ();
+ defined = true;
+
+ return label;
+ }
+
+ public string Name {
+ get { return name; }
+ }
+
+ public bool IsDefined {
+ get { return defined; }
+ }
+
+ public bool HasBeenReferenced {
+ get { return referenced; }
+ }
+
+ public FlowBranching.UsageVector JumpOrigins {
+ get { return vectors; }
+ }
+
+ public void AddUsageVector (FlowBranching.UsageVector vector)
+ {
+ vector = vector.Clone ();
+ vector.Next = vectors;
+ vectors = vector;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ // this flow-branching will be terminated when the surrounding block ends
+ ec.StartFlowBranching (this);
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (ig != null && ig != ec.ig)
+ throw new InternalErrorException ("cannot happen");
+ LabelTarget (ec);
+ ec.ig.MarkLabel (label);
+ }
+
+ public void AddReference ()
+ {
+ referenced = true;
+ }
+ }
+
+
+ /// <summary>
+ /// `goto default' statement
+ /// </summary>
+ public class GotoDefault : Statement {
+
+ public GotoDefault (Location l)
+ {
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (ec.Switch == null){
+ Report.Error (153, loc, "A goto case is only valid inside a switch statement");
+ return;
+ }
+
+ if (!ec.Switch.GotDefault){
+ Report.Error (159, loc, "No such label `default:' within the scope of the goto statement");
+ return;
+ }
+ ec.ig.Emit (OpCodes.Br, ec.Switch.DefaultTarget);
+ }
+ }
+
+ /// <summary>
+ /// `goto case' statement
+ /// </summary>
+ public class GotoCase : Statement {
+ Expression expr;
+ SwitchLabel sl;
+
+ public GotoCase (Expression e, Location l)
+ {
+ expr = e;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ if (ec.Switch == null){
+ Report.Error (153, loc, "A goto case is only valid inside a switch statement");
+ return false;
+ }
+
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return false;
+
+ Constant c = expr as Constant;
+ if (c == null) {
+ Error (150, "A constant value is expected");
+ return false;
+ }
+
+ Type type = ec.Switch.SwitchType;
+ if (!Convert.ImplicitStandardConversionExists (c, type))
+ Report.Warning (469, 2, loc, "The `goto case' value is not implicitly " +
+ "convertible to type `{0}'", TypeManager.CSharpName (type));
+
+ bool fail = false;
+ object val = c.GetValue ();
+ if ((val != null) && (c.Type != type) && (c.Type != TypeManager.object_type))
+ val = TypeManager.ChangeType (val, type, out fail);
+
+ if (fail) {
+ Report.Error (30, loc, "Cannot convert type `{0}' to `{1}'",
+ c.GetSignatureForError (), TypeManager.CSharpName (type));
+ return false;
+ }
+
+ if (val == null)
+ val = SwitchLabel.NullStringCase;
+
+ sl = (SwitchLabel) ec.Switch.Elements [val];
+
+ if (sl == null){
+ Report.Error (159, loc, "No such label `case {0}:' within the scope of the goto statement", c.GetValue () == null ? "null" : val.ToString ());
+ return false;
+ }
+
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Br, sl.GetILLabelCode (ec));
+ }
+ }
+
+ public class Throw : Statement {
+ Expression expr;
+
+ public Throw (Expression expr, Location l)
+ {
+ this.expr = expr;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ ec.CurrentBranching.CurrentUsageVector.Throw ();
+
+ if (expr != null){
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return false;
+
+ ExprClass eclass = expr.eclass;
+
+ if (!(eclass == ExprClass.Variable || eclass == ExprClass.PropertyAccess ||
+ eclass == ExprClass.Value || eclass == ExprClass.IndexerAccess)) {
+ expr.Error_UnexpectedKind (ec.DeclContainer, "value, variable, property or indexer access ", loc);
+ return false;
+ }
+
+ Type t = expr.Type;
+
+ if ((t != TypeManager.exception_type) &&
+ !TypeManager.IsSubclassOf (t, TypeManager.exception_type) &&
+ !(expr is NullLiteral)) {
+ Error (155,
+ "The type caught or thrown must be derived " +
+ "from System.Exception");
+ return false;
+ }
+ return true;
+ }
+
+ if (!ec.InCatch) {
+ Error (156, "A throw statement with no arguments is not allowed outside of a catch clause");
+ return false;
+ }
+
+ if (ec.InFinally) {
+ Error (724, "A throw statement with no arguments is not allowed inside of a finally clause nested inside of the innermost catch clause");
+ return false;
+ }
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (expr == null)
+ ec.ig.Emit (OpCodes.Rethrow);
+ else {
+ expr.Emit (ec);
+
+ ec.ig.Emit (OpCodes.Throw);
+ }
+ }
+ }
+
+ public class Break : Statement {
+
+ public Break (Location l)
+ {
+ loc = l;
+ }
+
+ bool unwind_protect;
+
+ public override bool Resolve (EmitContext ec)
+ {
+ int errors = Report.Errors;
+ unwind_protect = ec.CurrentBranching.AddBreakOrigin (ec.CurrentBranching.CurrentUsageVector, loc);
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+ return errors == Report.Errors;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ec.ig.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, ec.LoopEnd);
+ }
+ }
+
+ public class Continue : Statement {
+
+ public Continue (Location l)
+ {
+ loc = l;
+ }
+
+ bool unwind_protect;
+
+ public override bool Resolve (EmitContext ec)
+ {
+ int errors = Report.Errors;
+ unwind_protect = ec.CurrentBranching.AddContinueOrigin (ec.CurrentBranching.CurrentUsageVector, loc);
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+ return errors == Report.Errors;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ec.ig.Emit (unwind_protect ? OpCodes.Leave : OpCodes.Br, ec.LoopBegin);
+ }
+ }
+
+ public abstract class Variable
+ {
+ public abstract Type Type {
+ get;
+ }
+
+ public abstract bool HasInstance {
+ get;
+ }
+
+ public abstract bool NeedsTemporary {
+ get;
+ }
+
+ public abstract void EmitInstance (EmitContext ec);
+
+ public abstract void Emit (EmitContext ec);
+
+ public abstract void EmitAssign (EmitContext ec);
+
+ public abstract void EmitAddressOf (EmitContext ec);
+ }
+
+ //
+ // The information about a user-perceived local variable
+ //
+ public class LocalInfo {
+ public Expression Type;
+
+ public Type VariableType;
+ public readonly string Name;
+ public readonly Location Location;
+ public readonly Block Block;
+
+ public VariableInfo VariableInfo;
+
+ Variable var;
+ public Variable Variable {
+ get { return var; }
+ }
+
+ [Flags]
+ enum Flags : byte {
+ Used = 1,
+ ReadOnly = 2,
+ Pinned = 4,
+ IsThis = 8,
+ Captured = 16,
+ AddressTaken = 32,
+ CompilerGenerated = 64,
+ IsConstant = 128
+ }
+
+ public enum ReadOnlyContext: byte {
+ Using,
+ Foreach,
+ Fixed
+ }
+
+ Flags flags;
+ ReadOnlyContext ro_context;
+
+ public LocalInfo (Expression type, string name, Block block, Location l)
+ {
+ Type = type;
+ Name = name;
+ Block = block;
+ Location = l;
+ }
+
+ public LocalInfo (DeclSpace ds, Block block, Location l)
+ {
+ VariableType = ds.TypeBuilder;
+ Block = block;
+ Location = l;
+ }
+
+ public void ResolveVariable (EmitContext ec)
+ {
+ Block theblock = Block;
+ while (theblock.Implicit)
+ theblock = theblock.Parent;
+ if (theblock.ScopeInfo != null)
+ var = theblock.ScopeInfo.GetCapturedVariable (this);
+
+ if (var == null) {
+ LocalBuilder builder;
+ if (Pinned)
+ //
+ // This is needed to compile on both .NET 1.x and .NET 2.x
+ // the later introduced `DeclareLocal (Type t, bool pinned)'
+ //
+ builder = TypeManager.DeclareLocalPinned (ec.ig, VariableType);
+ else
+ builder = ec.ig.DeclareLocal (VariableType);
+
+ var = new LocalVariable (this, builder);
+ }
+ }
+
+ public bool IsThisAssigned (EmitContext ec, Location loc)
+ {
+ if (VariableInfo == null)
+ throw new Exception ();
+
+ if (!ec.DoFlowAnalysis || ec.CurrentBranching.IsAssigned (VariableInfo))
+ return true;
+
+ return VariableInfo.TypeInfo.IsFullyInitialized (ec.CurrentBranching, VariableInfo, loc);
+ }
+
+ public bool IsAssigned (EmitContext ec)
+ {
+ if (VariableInfo == null)
+ throw new Exception ();
+
+ return !ec.DoFlowAnalysis || ec.CurrentBranching.IsAssigned (VariableInfo);
+ }
+
+ public bool Resolve (EmitContext ec)
+ {
+ if (VariableType == null) {
+ TypeExpr texpr = Type.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return false;
+
+ VariableType = texpr.Type;
+ }
+
+ if (VariableType == TypeManager.void_type) {
+ Expression.Error_VoidInvalidInTheContext (Location);
+ return false;
+ }
+
+ if (VariableType.IsAbstract && VariableType.IsSealed) {
+ FieldMember.Error_VariableOfStaticClass (Location, Name, VariableType);
+ return false;
+ }
+
+ if (VariableType.IsPointer && !ec.InUnsafe)
+ Expression.UnsafeError (Location);
+
+ return true;
+ }
+
+ public bool IsCaptured {
+ get {
+ return (flags & Flags.Captured) != 0;
+ }
+
+ set {
+ flags |= Flags.Captured;
+ }
+ }
+
+ public bool IsConstant {
+ get {
+ return (flags & Flags.IsConstant) != 0;
+ }
+ set {
+ flags |= Flags.IsConstant;
+ }
+ }
+
+ public bool AddressTaken {
+ get {
+ return (flags & Flags.AddressTaken) != 0;
+ }
+
+ set {
+ flags |= Flags.AddressTaken;
+ }
+ }
+
+ public bool CompilerGenerated {
+ get {
+ return (flags & Flags.CompilerGenerated) != 0;
+ }
+
+ set {
+ flags |= Flags.CompilerGenerated;
+ }
+ }
+
+ public override string ToString ()
+ {
+ return String.Format ("LocalInfo ({0},{1},{2},{3})",
+ Name, Type, VariableInfo, Location);
+ }
+
+ public bool Used {
+ get {
+ return (flags & Flags.Used) != 0;
+ }
+ set {
+ flags = value ? (flags | Flags.Used) : (unchecked (flags & ~Flags.Used));
+ }
+ }
+
+ public bool ReadOnly {
+ get {
+ return (flags & Flags.ReadOnly) != 0;
+ }
+ }
+
+ public void SetReadOnlyContext (ReadOnlyContext context)
+ {
+ flags |= Flags.ReadOnly;
+ ro_context = context;
+ }
+
+ public string GetReadOnlyContext ()
+ {
+ if (!ReadOnly)
+ throw new InternalErrorException ("Variable is not readonly");
+
+ switch (ro_context) {
+ case ReadOnlyContext.Fixed:
+ return "fixed variable";
+ case ReadOnlyContext.Foreach:
+ return "foreach iteration variable";
+ case ReadOnlyContext.Using:
+ return "using variable";
+ }
+ throw new NotImplementedException ();
+ }
+
+ //
+ // Whether the variable is pinned, if Pinned the variable has been
+ // allocated in a pinned slot with DeclareLocal.
+ //
+ public bool Pinned {
+ get {
+ return (flags & Flags.Pinned) != 0;
+ }
+ set {
+ flags = value ? (flags | Flags.Pinned) : (flags & ~Flags.Pinned);
+ }
+ }
+
+ public bool IsThis {
+ get {
+ return (flags & Flags.IsThis) != 0;
+ }
+ set {
+ flags = value ? (flags | Flags.IsThis) : (flags & ~Flags.IsThis);
+ }
+ }
+
+ protected class LocalVariable : Variable
+ {
+ public readonly LocalInfo LocalInfo;
+ LocalBuilder builder;
+
+ public LocalVariable (LocalInfo local, LocalBuilder builder)
+ {
+ this.LocalInfo = local;
+ this.builder = builder;
+ }
+
+ public override Type Type {
+ get { return LocalInfo.VariableType; }
+ }
+
+ public override bool HasInstance {
+ get { return false; }
+ }
+
+ public override bool NeedsTemporary {
+ get { return false; }
+ }
+
+ public override void EmitInstance (EmitContext ec)
+ {
+ // Do nothing.
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldloc, builder);
+ }
+
+ public override void EmitAssign (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Stloc, builder);
+ }
+
+ public override void EmitAddressOf (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldloca, builder);
+ }
+ }
+ }
+
+ /// <summary>
+ /// Block represents a C# block.
+ /// </summary>
+ ///
+ /// <remarks>
+ /// This class is used in a number of places: either to represent
+ /// explicit blocks that the programmer places or implicit blocks.
+ ///
+ /// Implicit blocks are used as labels or to introduce variable
+ /// declarations.
+ ///
+ /// Top-level blocks derive from Block, and they are called ToplevelBlock
+ /// they contain extra information that is not necessary on normal blocks.
+ /// </remarks>
+ public class Block : Statement {
+ public Block Parent;
+ public readonly Location StartLocation;
+ public Location EndLocation = Location.Null;
+
+ public readonly ToplevelBlock Toplevel;
+
+ [Flags]
+ public enum Flags : ushort {
+ Implicit = 1,
+ Unchecked = 2,
+ BlockUsed = 4,
+ VariablesInitialized = 8,
+ HasRet = 16,
+ IsDestructor = 32,
+ IsToplevel = 64,
+ Unsafe = 128,
+ HasVarargs = 256, // Used in ToplevelBlock
+ IsIterator = 512
+
+ }
+ protected Flags flags;
+
+ public bool Implicit {
+ get { return (flags & Flags.Implicit) != 0; }
+ }
+
+ public bool Unchecked {
+ get { return (flags & Flags.Unchecked) != 0; }
+ set { flags |= Flags.Unchecked; }
+ }
+
+ public bool Unsafe {
+ get { return (flags & Flags.Unsafe) != 0; }
+ set { flags |= Flags.Unsafe; }
+ }
+
+ //
+ // The statements in this block
+ //
+ protected ArrayList statements;
+ int num_statements;
+
+ //
+ // An array of Blocks. We keep track of children just
+ // to generate the local variable declarations.
+ //
+ // Statements and child statements are handled through the
+ // statements.
+ //
+ ArrayList children;
+
+ //
+ // Labels. (label, block) pairs.
+ //
+ Hashtable labels;
+
+ //
+ // Keeps track of (name, type) pairs
+ //
+ IDictionary variables;
+
+ //
+ // Keeps track of constants
+ Hashtable constants;
+
+ //
+ // Temporary variables.
+ //
+ ArrayList temporary_variables;
+
+ //
+ // If this is a switch section, the enclosing switch block.
+ //
+ Block switch_block;
+
+ ExpressionStatement scope_init;
+
+ ArrayList anonymous_children;
+
+ protected static int id;
+
+ int this_id;
+
+ public Block (Block parent)
+ : this (parent, (Flags) 0, Location.Null, Location.Null)
+ { }
+
+ public Block (Block parent, Flags flags)
+ : this (parent, flags, Location.Null, Location.Null)
+ { }
+
+ public Block (Block parent, Location start, Location end)
+ : this (parent, (Flags) 0, start, end)
+ { }
+
+ public Block (Block parent, Flags flags, Location start, Location end)
+ {
+ if (parent != null)
+ parent.AddChild (this);
+
+ this.Parent = parent;
+ this.flags = flags;
+ this.StartLocation = start;
+ this.EndLocation = end;
+ this.loc = start;
+ this_id = id++;
+ statements = new ArrayList ();
+
+ if ((flags & Flags.IsToplevel) != 0)
+ Toplevel = (ToplevelBlock) this;
+ else
+ Toplevel = parent.Toplevel;
+
+ if (parent != null && Implicit) {
+ if (parent.known_variables == null)
+ parent.known_variables = new Hashtable ();
+ // share with parent
+ known_variables = parent.known_variables;
+ }
+ }
+
+ public Block CreateSwitchBlock (Location start)
+ {
+ Block new_block = new Block (this, start, start);
+ new_block.switch_block = this;
+ return new_block;
+ }
+
+ public int ID {
+ get { return this_id; }
+ }
+
+ public IDictionary Variables {
+ get {
+ if (variables == null)
+ variables = new ListDictionary ();
+ return variables;
+ }
+ }
+
+ void AddChild (Block b)
+ {
+ if (children == null)
+ children = new ArrayList ();
+
+ children.Add (b);
+ }
+
+ public void SetEndLocation (Location loc)
+ {
+ EndLocation = loc;
+ }
+
+ protected static void Error_158 (string name, Location loc)
+ {
+ Report.Error (158, loc, "The label `{0}' shadows another label " +
+ "by the same name in a contained scope.", name);
+ }
+
+ /// <summary>
+ /// Adds a label to the current block.
+ /// </summary>
+ ///
+ /// <returns>
+ /// false if the name already exists in this block. true
+ /// otherwise.
+ /// </returns>
+ ///
+ public bool AddLabel (LabeledStatement target)
+ {
+ if (switch_block != null)
+ return switch_block.AddLabel (target);
+
+ string name = target.Name;
+
+ Block cur = this;
+ while (cur != null) {
+ if (cur.DoLookupLabel (name) != null) {
+ Report.Error (140, target.loc,
+ "The label `{0}' is a duplicate", name);
+ return false;
+ }
+
+ if (!Implicit)
+ break;
+
+ cur = cur.Parent;
+ }
+
+ while (cur != null) {
+ if (cur.DoLookupLabel (name) != null) {
+ Error_158 (name, target.loc);
+ return false;
+ }
+
+ if (children != null) {
+ foreach (Block b in children) {
+ LabeledStatement s = b.DoLookupLabel (name);
+ if (s == null)
+ continue;
+
+ Error_158 (name, target.loc);
+ return false;
+ }
+ }
+
+ cur = cur.Parent;
+ }
+
+ Toplevel.CheckError158 (name, target.loc);
+
+ if (labels == null)
+ labels = new Hashtable ();
+
+ labels.Add (name, target);
+ return true;
+ }
+
+ public LabeledStatement LookupLabel (string name)
+ {
+ LabeledStatement s = DoLookupLabel (name);
+ if (s != null)
+ return s;
+
+ if (children == null)
+ return null;
+
+ foreach (Block child in children) {
+ if (!child.Implicit)
+ continue;
+
+ s = child.LookupLabel (name);
+ if (s != null)
+ return s;
+ }
+
+ return null;
+ }
+
+ LabeledStatement DoLookupLabel (string name)
+ {
+ if (switch_block != null)
+ return switch_block.LookupLabel (name);
+
+ if (labels != null)
+ if (labels.Contains (name))
+ return ((LabeledStatement) labels [name]);
+
+ return null;
+ }
+
+ Hashtable known_variables;
+
+ // <summary>
+ // Marks a variable with name @name as being used in this or a child block.
+ // If a variable name has been used in a child block, it's illegal to
+ // declare a variable with the same name in the current block.
+ // </summary>
+ void AddKnownVariable (string name, LocalInfo info)
+ {
+ if (known_variables == null)
+ known_variables = new Hashtable ();
+
+ known_variables [name] = info;
+ }
+
+ LocalInfo GetKnownVariableInfo (string name, bool recurse)
+ {
+ if (known_variables != null) {
+ LocalInfo vi = (LocalInfo) known_variables [name];
+ if (vi != null)
+ return vi;
+ }
+
+ if (!recurse || (children == null))
+ return null;
+
+ foreach (Block block in children) {
+ LocalInfo vi = block.GetKnownVariableInfo (name, true);
+ if (vi != null)
+ return vi;
+ }
+
+ return null;
+ }
+
+ public bool CheckInvariantMeaningInBlock (string name, Expression e, Location loc)
+ {
+ Block b = this;
+ LocalInfo kvi = b.GetKnownVariableInfo (name, true);
+ while (kvi == null) {
+ while (b.Implicit)
+ b = b.Parent;
+ b = b.Parent;
+ if (b == null)
+ return true;
+ kvi = b.GetKnownVariableInfo (name, false);
+ }
+
+ if (kvi.Block == b)
+ return true;
+
+ // Is kvi.Block nested inside 'b'
+ if (b.known_variables != kvi.Block.known_variables) {
+ //
+ // If a variable by the same name it defined in a nested block of this
+ // block, we violate the invariant meaning in a block.
+ //
+ if (b == this) {
+ Report.SymbolRelatedToPreviousError (kvi.Location, name);
+ Report.Error (135, loc, "`{0}' conflicts with a declaration in a child block", name);
+ return false;
+ }
+
+ //
+ // It's ok if the definition is in a nested subblock of b, but not
+ // nested inside this block -- a definition in a sibling block
+ // should not affect us.
+ //
+ return true;
+ }
+
+ //
+ // Block 'b' and kvi.Block are the same textual block.
+ // However, different variables are extant.
+ //
+ // Check if the variable is in scope in both blocks. We use
+ // an indirect check that depends on AddVariable doing its
+ // part in maintaining the invariant-meaning-in-block property.
+ //
+ if (e is LocalVariableReference || (e is Constant && b.GetLocalInfo (name) != null))
+ return true;
+
+ //
+ // Even though we detected the error when the name is used, we
+ // treat it as if the variable declaration was in error.
+ //
+ Report.SymbolRelatedToPreviousError (loc, name);
+ Error_AlreadyDeclared (kvi.Location, name, "parent or current");
+ return false;
+ }
+
+ public bool CheckError136_InParents (string name, Location loc)
+ {
+ for (Block b = Parent; b != null; b = b.Parent) {
+ if (!b.DoCheckError136 (name, "parent or current", loc))
+ return false;
+ }
+
+ for (Block b = Toplevel.ContainerBlock; b != null; b = b.Toplevel.ContainerBlock) {
+ if (!b.CheckError136_InParents (name, loc))
+ return false;
+ }
+
+ return true;
+ }
+
+ public bool CheckError136_InChildren (string name, Location loc)
+ {
+ if (!DoCheckError136_InChildren (name, loc))
+ return false;
+
+ Block b = this;
+ while (b.Implicit) {
+ if (!b.Parent.DoCheckError136_InChildren (name, loc))
+ return false;
+ b = b.Parent;
+ }
+
+ return true;
+ }
+
+ protected bool DoCheckError136_InChildren (string name, Location loc)
+ {
+ if (!DoCheckError136 (name, "child", loc))
+ return false;
+
+ if (AnonymousChildren != null) {
+ foreach (ToplevelBlock child in AnonymousChildren) {
+ if (!child.DoCheckError136_InChildren (name, loc))
+ return false;
+ }
+ }
+
+ if (children != null) {
+ foreach (Block child in children) {
+ if (!child.DoCheckError136_InChildren (name, loc))
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ public bool CheckError136 (string name, string scope, bool check_parents,
+ bool check_children, Location loc)
+ {
+ if (!DoCheckError136 (name, scope, loc))
+ return false;
+
+ if (check_parents) {
+ if (!CheckError136_InParents (name, loc))
+ return false;
+ }
+
+ if (check_children) {
+ if (!CheckError136_InChildren (name, loc))
+ return false;
+ }
+
+ for (Block c = Toplevel.ContainerBlock; c != null; c = c.Toplevel.ContainerBlock) {
+ if (!c.DoCheckError136 (name, "parent or current", loc))
+ return false;
+ }
+
+ return true;
+ }
+
+ protected bool DoCheckError136 (string name, string scope, Location loc)
+ {
+ LocalInfo vi = GetKnownVariableInfo (name, false);
+ if (vi != null) {
+ Report.SymbolRelatedToPreviousError (vi.Location, name);
+ Error_AlreadyDeclared (loc, name, scope != null ? scope : "child");
+ return false;
+ }
+
+ int idx;
+ Parameter p = Toplevel.Parameters.GetParameterByName (name, out idx);
+ if (p != null) {
+ Report.SymbolRelatedToPreviousError (p.Location, name);
+ Error_AlreadyDeclared (
+ loc, name, scope != null ? scope : "method argument");
+ return false;
+ }
+
+ return true;
+ }
+
+ public LocalInfo AddVariable (Expression type, string name, Location l)
+ {
+ LocalInfo vi = GetLocalInfo (name);
+ if (vi != null) {
+ Report.SymbolRelatedToPreviousError (vi.Location, name);
+ if (known_variables == vi.Block.known_variables)
+ Report.Error (128, l,
+ "A local variable named `{0}' is already defined in this scope", name);
+ else
+ Error_AlreadyDeclared (l, name, "parent");
+ return null;
+ }
+
+ if (!CheckError136 (name, null, true, true, l))
+ return null;
+
+ vi = new LocalInfo (type, name, this, l);
+ Variables.Add (name, vi);
+ AddKnownVariable (name, vi);
+
+ if ((flags & Flags.VariablesInitialized) != 0)
+ throw new Exception ();
+
+ return vi;
+ }
+
+ void Error_AlreadyDeclared (Location loc, string var, string reason)
+ {
+ Report.Error (136, loc, "A local variable named `{0}' cannot be declared " +
+ "in this scope because it would give a different meaning " +
+ "to `{0}', which is already used in a `{1}' scope " +
+ "to denote something else", var, reason);
+ }
+
+ public bool AddConstant (Expression type, string name, Expression value, Location l)
+ {
+ if (AddVariable (type, name, l) == null)
+ return false;
+
+ if (constants == null)
+ constants = new Hashtable ();
+
+ constants.Add (name, value);
+
+ // A block is considered used if we perform an initialization in a local declaration, even if it is constant.
+ Use ();
+ return true;
+ }
+
+ static int next_temp_id = 0;
+
+ public LocalInfo AddTemporaryVariable (TypeExpr te, Location loc)
+ {
+ Report.Debug (64, "ADD TEMPORARY", this, Toplevel, loc);
+
+ if (temporary_variables == null)
+ temporary_variables = new ArrayList ();
+
+ int id = ++next_temp_id;
+ string name = "$s_" + id.ToString ();
+
+ LocalInfo li = new LocalInfo (te, name, this, loc);
+ li.CompilerGenerated = true;
+ temporary_variables.Add (li);
+ return li;
+ }
+
+ public LocalInfo GetLocalInfo (string name)
+ {
+ for (Block b = this; b != null; b = b.Parent) {
+ if (b.variables != null) {
+ LocalInfo ret = b.variables [name] as LocalInfo;
+ if (ret != null)
+ return ret;
+ }
+ }
+ return null;
+ }
+
+ public Expression GetVariableType (string name)
+ {
+ LocalInfo vi = GetLocalInfo (name);
+ return vi == null ? null : vi.Type;
+ }
+
+ public Expression GetConstantExpression (string name)
+ {
+ for (Block b = this; b != null; b = b.Parent) {
+ if (b.constants != null) {
+ Expression ret = b.constants [name] as Expression;
+ if (ret != null)
+ return ret;
+ }
+ }
+ return null;
+ }
+
+ public void AddStatement (Statement s)
+ {
+ statements.Add (s);
+ flags |= Flags.BlockUsed;
+ }
+
+ public bool Used {
+ get { return (flags & Flags.BlockUsed) != 0; }
+ }
+
+ public void Use ()
+ {
+ flags |= Flags.BlockUsed;
+ }
+
+ public bool HasRet {
+ get { return (flags & Flags.HasRet) != 0; }
+ }
+
+ public bool IsDestructor {
+ get { return (flags & Flags.IsDestructor) != 0; }
+ }
+
+ public void SetDestructor ()
+ {
+ flags |= Flags.IsDestructor;
+ }
+
+ VariableMap param_map, local_map;
+
+ public VariableMap ParameterMap {
+ get {
+ if ((flags & Flags.VariablesInitialized) == 0)
+ throw new Exception ("Variables have not been initialized yet");
+
+ return param_map;
+ }
+ }
+
+ public VariableMap LocalMap {
+ get {
+ if ((flags & Flags.VariablesInitialized) == 0)
+ throw new Exception ("Variables have not been initialized yet");
+
+ return local_map;
+ }
+ }
+
+ public ScopeInfo ScopeInfo;
+
+ public ScopeInfo CreateScopeInfo ()
+ {
+ if (Implicit)
+ return Parent.CreateScopeInfo ();
+
+ if (ScopeInfo == null)
+ ScopeInfo = new ScopeInfo (Toplevel.AnonymousMethodHost, this);
+
+ return ScopeInfo;
+ }
+
+ public ArrayList AnonymousChildren {
+ get { return anonymous_children; }
+ }
+
+ public void AddAnonymousChild (ToplevelBlock b)
+ {
+ if (anonymous_children == null)
+ anonymous_children = new ArrayList ();
+
+ anonymous_children.Add (b);
+ }
+
+ /// <summary>
+ /// Emits the variable declarations and labels.
+ /// </summary>
+ /// <remarks>
+ /// tc: is our typecontainer (to resolve type references)
+ /// ig: is the code generator:
+ /// </remarks>
+ public void ResolveMeta (ToplevelBlock toplevel, EmitContext ec, Parameters ip)
+ {
+ Report.Debug (64, "BLOCK RESOLVE META", this, Parent, toplevel);
+
+ // If some parent block was unsafe, we remain unsafe even if this block
+ // isn't explicitly marked as such.
+ using (ec.With (EmitContext.Flags.InUnsafe, ec.InUnsafe | Unsafe)) {
+ //
+ // Compute the VariableMap's.
+ //
+ // Unfortunately, we don't know the type when adding variables with
+ // AddVariable(), so we need to compute this info here.
+ //
+
+ LocalInfo[] locals;
+ if (variables != null) {
+ foreach (LocalInfo li in variables.Values)
+ li.Resolve (ec);
+
+ locals = new LocalInfo [variables.Count];
+ variables.Values.CopyTo (locals, 0);
+ } else
+ locals = new LocalInfo [0];
+
+ if (Parent != null)
+ local_map = new VariableMap (Parent.LocalMap, locals);
+ else
+ local_map = new VariableMap (locals);
+
+ param_map = new VariableMap (ip);
+ flags |= Flags.VariablesInitialized;
+
+ //
+ // Process this block variables
+ //
+ if (variables != null) {
+ foreach (DictionaryEntry de in variables) {
+ string name = (string) de.Key;
+ LocalInfo vi = (LocalInfo) de.Value;
+ Type variable_type = vi.VariableType;
+
+ if (variable_type == null)
+ continue;
+
+ if (variable_type.IsPointer) {
+ //
+ // Am not really convinced that this test is required (Microsoft does it)
+ // but the fact is that you would not be able to use the pointer variable
+ // *anyways*
+ //
+ if (!TypeManager.VerifyUnManaged (TypeManager.GetElementType (variable_type),
+ vi.Location))
+ continue;
+ }
+
+ if (constants == null)
+ continue;
+
+ Expression cv = (Expression) constants [name];
+ if (cv == null)
+ continue;
+
+ // Don't let 'const int Foo = Foo;' succeed.
+ // Removing the name from 'constants' ensures that we get a LocalVariableReference below,
+ // which in turn causes the 'must be constant' error to be triggered.
+ constants.Remove (name);
+
+ if (!Const.IsConstantTypeValid (variable_type)) {
+ Const.Error_InvalidConstantType (variable_type, loc);
+ continue;
+ }
+
+ using (ec.With (EmitContext.Flags.ConstantCheckState, (flags & Flags.Unchecked) == 0)) {
+ ec.CurrentBlock = this;
+ Expression e = cv.Resolve (ec);
+ if (e == null)
+ continue;
+
+ Constant ce = e as Constant;
+ if (ce == null) {
+ Const.Error_ExpressionMustBeConstant (vi.Location, name);
+ continue;
+ }
+
+ e = ce.ImplicitConversionRequired (variable_type, vi.Location);
+ if (e == null)
+ continue;
+
+ if (!variable_type.IsValueType && variable_type != TypeManager.string_type && !ce.IsDefaultValue) {
+ Const.Error_ConstantCanBeInitializedWithNullOnly (vi.Location, vi.Name);
+ continue;
+ }
+
+ constants.Add (name, e);
+ vi.IsConstant = true;
+ }
+ }
+ }
+
+ //
+ // Now, handle the children
+ //
+ if (children != null) {
+ foreach (Block b in children)
+ b.ResolveMeta (toplevel, ec, ip);
+ }
+ }
+ }
+
+ //
+ // Emits the local variable declarations for a block
+ //
+ public virtual void EmitMeta (EmitContext ec)
+ {
+ Report.Debug (64, "BLOCK EMIT META", this, Toplevel, ScopeInfo, ec);
+ if (ScopeInfo != null) {
+ scope_init = ScopeInfo.GetScopeInitializer (ec);
+ Report.Debug (64, "BLOCK EMIT META #1", this, Toplevel, ScopeInfo,
+ ec, scope_init);
+ }
+
+ if (variables != null){
+ foreach (LocalInfo vi in variables.Values)
+ vi.ResolveVariable (ec);
+ }
+
+ if (temporary_variables != null) {
+ foreach (LocalInfo vi in temporary_variables)
+ vi.ResolveVariable (ec);
+ }
+
+ if (children != null){
+ foreach (Block b in children)
+ b.EmitMeta (ec);
+ }
+ }
+
+ void UsageWarning (FlowBranching.UsageVector vector)
+ {
+ string name;
+
+ if ((variables != null) && (RootContext.WarningLevel >= 3)) {
+ foreach (DictionaryEntry de in variables){
+ LocalInfo vi = (LocalInfo) de.Value;
+
+ if (vi.Used)
+ continue;
+
+ name = (string) de.Key;
+
+ // vi.VariableInfo can be null for 'catch' variables
+ if (vi.VariableInfo != null && vector.IsAssigned (vi.VariableInfo, true)){
+ Report.Warning (219, 3, vi.Location, "The variable `{0}' is assigned but its value is never used", name);
+ } else {
+ Report.Warning (168, 3, vi.Location, "The variable `{0}' is declared but never used", name);
+ }
+ }
+ }
+ }
+
+ bool unreachable_shown;
+ bool unreachable;
+
+ private void CheckPossibleMistakenEmptyStatement (Statement s)
+ {
+ Statement body;
+
+ // Some statements are wrapped by a Block. Since
+ // others' internal could be changed, here I treat
+ // them as possibly wrapped by Block equally.
+ Block b = s as Block;
+ if (b != null && b.statements.Count == 1)
+ s = (Statement) b.statements [0];
+
+ if (s is Lock)
+ body = ((Lock) s).Statement;
+ else if (s is For)
+ body = ((For) s).Statement;
+ else if (s is Foreach)
+ body = ((Foreach) s).Statement;
+ else if (s is While)
+ body = ((While) s).Statement;
+ else if (s is Using)
+ body = ((Using) s).Statement;
+ else if (s is Fixed)
+ body = ((Fixed) s).Statement;
+ else
+ return;
+
+ if (body == null || body is EmptyStatement)
+ Report.Warning (642, 3, s.loc, "Possible mistaken empty statement");
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ Block prev_block = ec.CurrentBlock;
+ bool ok = true;
+
+ int errors = Report.Errors;
+
+ ec.CurrentBlock = this;
+ ec.StartFlowBranching (this);
+
+ Report.Debug (4, "RESOLVE BLOCK", StartLocation, ec.CurrentBranching);
+
+ //
+ // This flag is used to notate nested statements as unreachable from the beginning of this block.
+ // For the purposes of this resolution, it doesn't matter that the whole block is unreachable
+ // from the beginning of the function. The outer Resolve() that detected the unreachability is
+ // responsible for handling the situation.
+ //
+ int statement_count = statements.Count;
+ for (int ix = 0; ix < statement_count; ix++){
+ Statement s = (Statement) statements [ix];
+ // Check possible empty statement (CS0642)
+ if (RootContext.WarningLevel >= 3 &&
+ ix + 1 < statement_count &&
+ statements [ix + 1] is Block)
+ CheckPossibleMistakenEmptyStatement (s);
+
+ //
+ // Warn if we detect unreachable code.
+ //
+ if (unreachable) {
+ if (s is EmptyStatement)
+ continue;
+
+ if (s is Block)
+ ((Block) s).unreachable = true;
+
+ if (!unreachable_shown && !(s is LabeledStatement)) {
+ Report.Warning (162, 2, s.loc, "Unreachable code detected");
+ unreachable_shown = true;
+ }
+ }
+
+ //
+ // Note that we're not using ResolveUnreachable() for unreachable
+ // statements here. ResolveUnreachable() creates a temporary
+ // flow branching and kills it afterwards. This leads to problems
+ // if you have two unreachable statements where the first one
+ // assigns a variable and the second one tries to access it.
+ //
+
+ if (!s.Resolve (ec)) {
+ ok = false;
+ statements [ix] = EmptyStatement.Value;
+ continue;
+ }
+
+ if (unreachable && !(s is LabeledStatement) && !(s is Block))
+ statements [ix] = EmptyStatement.Value;
+
+ num_statements = ix + 1;
+
+ unreachable = ec.CurrentBranching.CurrentUsageVector.Reachability.IsUnreachable;
+ if (unreachable && s is LabeledStatement)
+ throw new InternalErrorException ("should not happen");
+ }
+
+ Report.Debug (4, "RESOLVE BLOCK DONE", StartLocation,
+ ec.CurrentBranching, statement_count, num_statements);
+
+ while (ec.CurrentBranching is FlowBranchingLabeled)
+ ec.EndFlowBranching ();
+
+ FlowBranching.UsageVector vector = ec.DoEndFlowBranching ();
+
+ ec.CurrentBlock = prev_block;
+
+ // If we're a non-static `struct' constructor which doesn't have an
+ // initializer, then we must initialize all of the struct's fields.
+ if ((flags & Flags.IsToplevel) != 0 &&
+ !Toplevel.IsThisAssigned (ec) &&
+ !vector.Reachability.AlwaysThrows)
+ ok = false;
+
+ if ((labels != null) && (RootContext.WarningLevel >= 2)) {
+ foreach (LabeledStatement label in labels.Values)
+ if (!label.HasBeenReferenced)
+ Report.Warning (164, 2, label.loc,
+ "This label has not been referenced");
+ }
+
+ Report.Debug (4, "RESOLVE BLOCK DONE #2", StartLocation, vector);
+
+ if (vector.Reachability.IsUnreachable)
+ flags |= Flags.HasRet;
+
+ if (ok && (errors == Report.Errors)) {
+ if (RootContext.WarningLevel >= 3)
+ UsageWarning (vector);
+ }
+
+ return ok;
+ }
+
+ public override bool ResolveUnreachable (EmitContext ec, bool warn)
+ {
+ unreachable_shown = true;
+ unreachable = true;
+
+ if (warn)
+ Report.Warning (162, 2, loc, "Unreachable code detected");
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Block, loc);
+ bool ok = Resolve (ec);
+ ec.KillFlowBranching ();
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ for (int ix = 0; ix < num_statements; ix++){
+ Statement s = (Statement) statements [ix];
+
+ // Check whether we are the last statement in a
+ // top-level block.
+
+ if (((Parent == null) || Implicit) && (ix+1 == num_statements) && !(s is Block))
+ ec.IsLastStatement = true;
+ else
+ ec.IsLastStatement = false;
+
+ s.Emit (ec);
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ Block prev_block = ec.CurrentBlock;
+
+ ec.CurrentBlock = this;
+
+ bool emit_debug_info = (CodeGen.SymbolWriter != null);
+ bool is_lexical_block = !Implicit && (Parent != null);
+
+ if (emit_debug_info) {
+ if (is_lexical_block)
+ ec.BeginScope ();
+ }
+ ec.Mark (StartLocation, true);
+ if (scope_init != null)
+ scope_init.EmitStatement (ec);
+ DoEmit (ec);
+ ec.Mark (EndLocation, true);
+
+ if (emit_debug_info && is_lexical_block)
+ ec.EndScope ();
+
+ ec.CurrentBlock = prev_block;
+ }
+
+ //
+ // Returns true if we ar ea child of `b'.
+ //
+ public bool IsChildOf (Block b)
+ {
+ Block current = this;
+
+ do {
+ if (current.Parent == b)
+ return true;
+ current = current.Parent;
+ } while (current != null);
+ return false;
+ }
+
+ public override string ToString ()
+ {
+ return String.Format ("{0} ({1}:{2})", GetType (),ID, StartLocation);
+ }
+ }
+
+ //
+ // A toplevel block contains extra information, the split is done
+ // only to separate information that would otherwise bloat the more
+ // lightweight Block.
+ //
+ // In particular, this was introduced when the support for Anonymous
+ // Methods was implemented.
+ //
+ public class ToplevelBlock : Block {
+ //
+ // Pointer to the host of this anonymous method, or null
+ // if we are the topmost block
+ //
+ Block container;
+ ToplevelBlock child;
+ GenericMethod generic;
+ FlowBranchingToplevel top_level_branching;
+ AnonymousMethodHost anonymous_method_host;
+
+ public bool HasVarargs {
+ get { return (flags & Flags.HasVarargs) != 0; }
+ set { flags |= Flags.HasVarargs; }
+ }
+
+ public bool IsIterator {
+ get { return (flags & Flags.IsIterator) != 0; }
+ }
+
+ //
+ // The parameters for the block.
+ //
+ Parameters parameters;
+ public Parameters Parameters {
+ get { return parameters; }
+ }
+
+ public bool CompleteContexts (EmitContext ec)
+ {
+ Report.Debug (64, "TOPLEVEL COMPLETE CONTEXTS", this,
+ container, anonymous_method_host);
+
+ return ScopeInfo.CompleteContexts (anonymous_method_host, container);
+ }
+
+ public GenericMethod GenericMethod {
+ get { return generic; }
+ }
+
+ public ToplevelBlock Container {
+ get { return container != null ? container.Toplevel : null; }
+ }
+
+ public Block ContainerBlock {
+ get { return container; }
+ }
+
+ //
+ // Parent is only used by anonymous blocks to link back to their
+ // parents
+ //
+ public ToplevelBlock (Block container, Parameters parameters, Location start) :
+ this (container, (Flags) 0, parameters, start)
+ {
+ }
+
+ public ToplevelBlock (Block container, Parameters parameters, GenericMethod generic,
+ Location start) :
+ this (container, parameters, start)
+ {
+ this.generic = generic;
+ }
+
+ public ToplevelBlock (Parameters parameters, Location start) :
+ this (null, (Flags) 0, parameters, start)
+ {
+ }
+
+ public ToplevelBlock (Flags flags, Parameters parameters, Location start) :
+ this (null, flags, parameters, start)
+ {
+ }
+
+ public ToplevelBlock (Block container, Flags flags, Parameters parameters, Location start) :
+ base (null, flags | Flags.IsToplevel, start, Location.Null)
+ {
+ this.parameters = parameters == null ? Parameters.EmptyReadOnlyParameters : parameters;
+ this.container = container;
+ }
+
+ public ToplevelBlock (Location loc) : this (null, (Flags) 0, null, loc)
+ {
+ }
+
+ public bool CheckError158 (string name, Location loc)
+ {
+ if (AnonymousChildren != null) {
+ foreach (ToplevelBlock child in AnonymousChildren) {
+ if (!child.CheckError158 (name, loc))
+ return false;
+ }
+ }
+
+ for (ToplevelBlock c = Container; c != null; c = c.Container) {
+ if (!c.DoCheckError158 (name, loc))
+ return false;
+ }
+
+ return true;
+ }
+
+ bool DoCheckError158 (string name, Location loc)
+ {
+ LabeledStatement s = LookupLabel (name);
+ if (s != null) {
+ Error_158 (name, loc);
+ return false;
+ }
+
+ return true;
+ }
+
+ public AnonymousMethodHost CreateAnonymousMethodHost (TypeContainer host)
+ {
+ if (anonymous_method_host != null)
+ return anonymous_method_host;
+
+ if (Container != null)
+ anonymous_method_host = new AnonymousMethodHost (
+ this, Container.anonymous_method_host, null, StartLocation);
+ else
+ anonymous_method_host = new AnonymousMethodHost (
+ this, host, generic, StartLocation);
+
+ ScopeInfo = anonymous_method_host;
+ return anonymous_method_host;
+ }
+
+ public void CreateIteratorHost (AnonymousMethodHost root_scope)
+ {
+ Report.Debug (64, "CREATE ITERATOR HOST", this, root_scope,
+ container, anonymous_method_host);
+
+ if ((container != null) || (anonymous_method_host != null))
+ throw new InternalErrorException ();
+
+ ScopeInfo = anonymous_method_host = root_scope;
+ }
+
+ public IAnonymousMethodHost AnonymousMethodHost {
+ get {
+ if (anonymous_method_host != null)
+ return anonymous_method_host;
+ else if (Container != null)
+ return Container.AnonymousMethodHost;
+ else
+ return null;
+ }
+ }
+
+ public void EmitScopeInstance (EmitContext ec, ScopeInfo scope)
+ {
+ ScopeInfo.EmitScopeInstance (ec, scope, this);
+ }
+
+ public FlowBranchingToplevel TopLevelBranching {
+ get { return top_level_branching; }
+ }
+
+ //
+ // This is used if anonymous methods are used inside an iterator
+ // (see 2test-22.cs for an example).
+ //
+ // The AnonymousMethod is created while parsing - at a time when we don't
+ // know yet that we're inside an iterator, so it's `Container' is initially
+ // null. Later on, when resolving the iterator, we need to move the
+ // anonymous method into that iterator.
+ //
+ public void ReParent (ToplevelBlock new_parent)
+ {
+ container = new_parent;
+ Parent = new_parent;
+ new_parent.child = this;
+
+#if FIXME
+ if (container != null)
+ container.AddAnonymousChild (this);
+#endif
+ }
+
+ //
+ // Returns a `ParameterReference' for the given name, or null if there
+ // is no such parameter
+ //
+ public ParameterReference GetParameterReference (string name, Location loc)
+ {
+ Parameter par;
+ int idx;
+
+ for (ToplevelBlock t = this; t != null; t = t.Container) {
+ Parameters pars = t.Parameters;
+ par = pars.GetParameterByName (name, out idx);
+ if (par != null)
+ return new ParameterReference (par, this, idx, loc);
+ }
+ return null;
+ }
+
+ //
+ // Whether the parameter named `name' is local to this block,
+ // or false, if the parameter belongs to an encompassing block.
+ //
+ public bool IsLocalParameter (string name)
+ {
+ return Parameters.GetParameterByName (name) != null;
+ }
+
+ //
+ // Whether the `name' is a parameter reference
+ //
+ public bool IsParameterReference (string name)
+ {
+ for (ToplevelBlock t = this; t != null; t = t.Container) {
+ if (t.IsLocalParameter (name))
+ return true;
+ }
+ return false;
+ }
+
+ LocalInfo this_variable = null;
+
+ // <summary>
+ // Returns the "this" instance variable of this block.
+ // See AddThisVariable() for more information.
+ // </summary>
+ public LocalInfo ThisVariable {
+ get { return this_variable; }
+ }
+
+
+ // <summary>
+ // This is used by non-static `struct' constructors which do not have an
+ // initializer - in this case, the constructor must initialize all of the
+ // struct's fields. To do this, we add a "this" variable and use the flow
+ // analysis code to ensure that it's been fully initialized before control
+ // leaves the constructor.
+ // </summary>
+ public LocalInfo AddThisVariable (DeclSpace ds, Location l)
+ {
+ if (this_variable == null) {
+ this_variable = new LocalInfo (ds, this, l);
+ this_variable.Used = true;
+ this_variable.IsThis = true;
+
+ Variables.Add ("this", this_variable);
+ }
+
+ return this_variable;
+ }
+
+ public bool IsThisAssigned (EmitContext ec)
+ {
+ return this_variable == null || this_variable.IsThisAssigned (ec, loc);
+ }
+
+ public bool ResolveMeta (EmitContext ec, Parameters ip)
+ {
+ int errors = Report.Errors;
+
+ if (top_level_branching != null)
+ return true;
+
+ if (ip != null)
+ parameters = ip;
+
+ if (!IsIterator && (container != null) && (parameters != null)) {
+ foreach (Parameter p in parameters.FixedParameters) {
+ if (!CheckError136_InParents (p.Name, loc))
+ return false;
+ }
+ }
+
+ ResolveMeta (this, ec, ip);
+
+ if (child != null)
+ child.ResolveMeta (this, ec, ip);
+
+ top_level_branching = ec.StartFlowBranching (this);
+
+ return Report.Errors == errors;
+ }
+
+ public override void EmitMeta (EmitContext ec)
+ {
+ base.EmitMeta (ec);
+ parameters.ResolveVariable (this);
+ }
+
+ public void MakeIterator (Iterator iterator)
+ {
+ flags |= Flags.IsIterator;
+
+ Block block = new Block (this);
+ foreach (Statement stmt in statements)
+ block.AddStatement (stmt);
+ statements = new ArrayList ();
+ statements.Add (new MoveNextStatement (iterator, block));
+ }
+
+ protected class MoveNextStatement : Statement {
+ Iterator iterator;
+ Block block;
+
+ public MoveNextStatement (Iterator iterator, Block block)
+ {
+ this.iterator = iterator;
+ this.block = block;
+ this.loc = iterator.Location;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ return block.Resolve (ec);
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ iterator.EmitMoveNext (ec, block);
+ }
+ }
+
+ public override string ToString ()
+ {
+ return String.Format ("{0} ({1}:{2}{3})", GetType (), ID, StartLocation,
+ anonymous_method_host);
+ }
+ }
+
+ public class SwitchLabel {
+ Expression label;
+ object converted;
+ Location loc;
+
+ Label il_label;
+ bool il_label_set;
+ Label il_label_code;
+ bool il_label_code_set;
+
+ public static readonly object NullStringCase = new object ();
+
+ //
+ // if expr == null, then it is the default case.
+ //
+ public SwitchLabel (Expression expr, Location l)
+ {
+ label = expr;
+ loc = l;
+ }
+
+ public Expression Label {
+ get {
+ return label;
+ }
+ }
+
+ public object Converted {
+ get {
+ return converted;
+ }
+ }
+
+ public Label GetILLabel (EmitContext ec)
+ {
+ if (!il_label_set){
+ il_label = ec.ig.DefineLabel ();
+ il_label_set = true;
+ }
+ return il_label;
+ }
+
+ public Label GetILLabelCode (EmitContext ec)
+ {
+ if (!il_label_code_set){
+ il_label_code = ec.ig.DefineLabel ();
+ il_label_code_set = true;
+ }
+ return il_label_code;
+ }
+
+ //
+ // Resolves the expression, reduces it to a literal if possible
+ // and then converts it to the requested type.
+ //
+ public bool ResolveAndReduce (EmitContext ec, Type required_type, bool allow_nullable)
+ {
+ Expression e = label.Resolve (ec);
+
+ if (e == null)
+ return false;
+
+ Constant c = e as Constant;
+ if (c == null){
+ Report.Error (150, loc, "A constant value is expected");
+ return false;
+ }
+
+ if (required_type == TypeManager.string_type && c.GetValue () == null) {
+ converted = NullStringCase;
+ return true;
+ }
+
+ if (allow_nullable && c.GetValue () == null) {
+ converted = NullStringCase;
+ return true;
+ }
+
+ c = c.ImplicitConversionRequired (required_type, loc);
+ if (c == null)
+ return false;
+
+ converted = c.GetValue ();
+ return true;
+ }
+
+ public void Erorr_AlreadyOccurs ()
+ {
+ string label;
+ if (converted == null)
+ label = "default";
+ else if (converted == NullStringCase)
+ label = "null";
+ else
+ label = converted.ToString ();
+
+ Report.Error (152, loc, "The label `case {0}:' already occurs in this switch statement", label);
+ }
+ }
+
+ public class SwitchSection {
+ // An array of SwitchLabels.
+ public readonly ArrayList Labels;
+ public readonly Block Block;
+
+ public SwitchSection (ArrayList labels, Block block)
+ {
+ Labels = labels;
+ Block = block;
+ }
+ }
+
+ public class Switch : Statement {
+ public readonly ArrayList Sections;
+ public Expression Expr;
+
+ /// <summary>
+ /// Maps constants whose type type SwitchType to their SwitchLabels.
+ /// </summary>
+ public IDictionary Elements;
+
+ /// <summary>
+ /// The governing switch type
+ /// </summary>
+ public Type SwitchType;
+
+ //
+ // Computed
+ //
+ Label default_target;
+ Label null_target;
+ Expression new_expr;
+ bool is_constant;
+ SwitchSection constant_section;
+ SwitchSection default_section;
+
+#if GMCS_SOURCE
+ //
+ // Nullable Types support for GMCS.
+ //
+ Nullable.Unwrap unwrap;
+
+ protected bool HaveUnwrap {
+ get { return unwrap != null; }
+ }
+#else
+ protected bool HaveUnwrap {
+ get { return false; }
+ }
+#endif
+
+ //
+ // The types allowed to be implicitly cast from
+ // on the governing type
+ //
+ static Type [] allowed_types;
+
+ public Switch (Expression e, ArrayList sects, Location l)
+ {
+ Expr = e;
+ Sections = sects;
+ loc = l;
+ }
+
+ public bool GotDefault {
+ get {
+ return default_section != null;
+ }
+ }
+
+ public Label DefaultTarget {
+ get {
+ return default_target;
+ }
+ }
+
+ //
+ // Determines the governing type for a switch. The returned
+ // expression might be the expression from the switch, or an
+ // expression that includes any potential conversions to the
+ // integral types or to string.
+ //
+ Expression SwitchGoverningType (EmitContext ec, Expression expr)
+ {
+ Type t = expr.Type;
+
+ if (t == TypeManager.byte_type ||
+ t == TypeManager.sbyte_type ||
+ t == TypeManager.ushort_type ||
+ t == TypeManager.short_type ||
+ t == TypeManager.uint32_type ||
+ t == TypeManager.int32_type ||
+ t == TypeManager.uint64_type ||
+ t == TypeManager.int64_type ||
+ t == TypeManager.char_type ||
+ t == TypeManager.string_type ||
+ t == TypeManager.bool_type ||
+ t.IsSubclassOf (TypeManager.enum_type))
+ return expr;
+
+ if (allowed_types == null){
+ allowed_types = new Type [] {
+ TypeManager.sbyte_type,
+ TypeManager.byte_type,
+ TypeManager.short_type,
+ TypeManager.ushort_type,
+ TypeManager.int32_type,
+ TypeManager.uint32_type,
+ TypeManager.int64_type,
+ TypeManager.uint64_type,
+ TypeManager.char_type,
+ TypeManager.string_type,
+ TypeManager.bool_type
+ };
+ }
+
+ //
+ // Try to find a *user* defined implicit conversion.
+ //
+ // If there is no implicit conversion, or if there are multiple
+ // conversions, we have to report an error
+ //
+ Expression converted = null;
+ foreach (Type tt in allowed_types){
+ Expression e;
+
+ e = Convert.ImplicitUserConversion (ec, expr, tt, loc);
+ if (e == null)
+ continue;
+
+ //
+ // Ignore over-worked ImplicitUserConversions that do
+ // an implicit conversion in addition to the user conversion.
+ //
+ if (!(e is UserCast))
+ continue;
+
+ if (converted != null){
+ Report.ExtraInformation (
+ loc,
+ String.Format ("reason: more than one conversion to an integral type exist for type {0}",
+ TypeManager.CSharpName (expr.Type)));
+ return null;
+ }
+
+ converted = e;
+ }
+ return converted;
+ }
+
+ //
+ // Performs the basic sanity checks on the switch statement
+ // (looks for duplicate keys and non-constant expressions).
+ //
+ // It also returns a hashtable with the keys that we will later
+ // use to compute the switch tables
+ //
+ bool CheckSwitch (EmitContext ec)
+ {
+ bool error = false;
+ Elements = Sections.Count > 10 ?
+ (IDictionary)new Hashtable () :
+ (IDictionary)new ListDictionary ();
+
+ foreach (SwitchSection ss in Sections){
+ foreach (SwitchLabel sl in ss.Labels){
+ if (sl.Label == null){
+ if (default_section != null){
+ sl.Erorr_AlreadyOccurs ();
+ error = true;
+ }
+ default_section = ss;
+ continue;
+ }
+
+ if (!sl.ResolveAndReduce (ec, SwitchType, HaveUnwrap)) {
+ error = true;
+ continue;
+ }
+
+ object key = sl.Converted;
+ try {
+ Elements.Add (key, sl);
+ } catch (ArgumentException) {
+ sl.Erorr_AlreadyOccurs ();
+ error = true;
+ }
+ }
+ }
+ return !error;
+ }
+
+ void EmitObjectInteger (ILGenerator ig, object k)
+ {
+ if (k is int)
+ IntConstant.EmitInt (ig, (int) k);
+ else if (k is Constant) {
+ EmitObjectInteger (ig, ((Constant) k).GetValue ());
+ }
+ else if (k is uint)
+ IntConstant.EmitInt (ig, unchecked ((int) (uint) k));
+ else if (k is long)
+ {
+ if ((long) k >= int.MinValue && (long) k <= int.MaxValue)
+ {
+ IntConstant.EmitInt (ig, (int) (long) k);
+ ig.Emit (OpCodes.Conv_I8);
+ }
+ else
+ LongConstant.EmitLong (ig, (long) k);
+ }
+ else if (k is ulong)
+ {
+ ulong ul = (ulong) k;
+ if (ul < (1L<<32))
+ {
+ IntConstant.EmitInt (ig, unchecked ((int) ul));
+ ig.Emit (OpCodes.Conv_U8);
+ }
+ else
+ {
+ LongConstant.EmitLong (ig, unchecked ((long) ul));
+ }
+ }
+ else if (k is char)
+ IntConstant.EmitInt (ig, (int) ((char) k));
+ else if (k is sbyte)
+ IntConstant.EmitInt (ig, (int) ((sbyte) k));
+ else if (k is byte)
+ IntConstant.EmitInt (ig, (int) ((byte) k));
+ else if (k is short)
+ IntConstant.EmitInt (ig, (int) ((short) k));
+ else if (k is ushort)
+ IntConstant.EmitInt (ig, (int) ((ushort) k));
+ else if (k is bool)
+ IntConstant.EmitInt (ig, ((bool) k) ? 1 : 0);
+ else
+ throw new Exception ("Unhandled case");
+ }
+
+ // structure used to hold blocks of keys while calculating table switch
+ class KeyBlock : IComparable
+ {
+ public KeyBlock (long _nFirst)
+ {
+ nFirst = nLast = _nFirst;
+ }
+ public long nFirst;
+ public long nLast;
+ public ArrayList rgKeys = null;
+ // how many items are in the bucket
+ public int Size = 1;
+ public int Length
+ {
+ get { return (int) (nLast - nFirst + 1); }
+ }
+ public static long TotalLength (KeyBlock kbFirst, KeyBlock kbLast)
+ {
+ return kbLast.nLast - kbFirst.nFirst + 1;
+ }
+ public int CompareTo (object obj)
+ {
+ KeyBlock kb = (KeyBlock) obj;
+ int nLength = Length;
+ int nLengthOther = kb.Length;
+ if (nLengthOther == nLength)
+ return (int) (kb.nFirst - nFirst);
+ return nLength - nLengthOther;
+ }
+ }
+
+ /// <summary>
+ /// This method emits code for a lookup-based switch statement (non-string)
+ /// Basically it groups the cases into blocks that are at least half full,
+ /// and then spits out individual lookup opcodes for each block.
+ /// It emits the longest blocks first, and short blocks are just
+ /// handled with direct compares.
+ /// </summary>
+ /// <param name="ec"></param>
+ /// <param name="val"></param>
+ /// <returns></returns>
+ void TableSwitchEmit (EmitContext ec, LocalBuilder val)
+ {
+ int cElements = Elements.Count;
+ object [] rgKeys = new object [cElements];
+ Elements.Keys.CopyTo (rgKeys, 0);
+ Array.Sort (rgKeys);
+
+ // initialize the block list with one element per key
+ ArrayList rgKeyBlocks = new ArrayList ();
+ foreach (object key in rgKeys)
+ rgKeyBlocks.Add (new KeyBlock (System.Convert.ToInt64 (key)));
+
+ KeyBlock kbCurr;
+ // iteratively merge the blocks while they are at least half full
+ // there's probably a really cool way to do this with a tree...
+ while (rgKeyBlocks.Count > 1)
+ {
+ ArrayList rgKeyBlocksNew = new ArrayList ();
+ kbCurr = (KeyBlock) rgKeyBlocks [0];
+ for (int ikb = 1; ikb < rgKeyBlocks.Count; ikb++)
+ {
+ KeyBlock kb = (KeyBlock) rgKeyBlocks [ikb];
+ if ((kbCurr.Size + kb.Size) * 2 >= KeyBlock.TotalLength (kbCurr, kb))
+ {
+ // merge blocks
+ kbCurr.nLast = kb.nLast;
+ kbCurr.Size += kb.Size;
+ }
+ else
+ {
+ // start a new block
+ rgKeyBlocksNew.Add (kbCurr);
+ kbCurr = kb;
+ }
+ }
+ rgKeyBlocksNew.Add (kbCurr);
+ if (rgKeyBlocks.Count == rgKeyBlocksNew.Count)
+ break;
+ rgKeyBlocks = rgKeyBlocksNew;
+ }
+
+ // initialize the key lists
+ foreach (KeyBlock kb in rgKeyBlocks)
+ kb.rgKeys = new ArrayList ();
+
+ // fill the key lists
+ int iBlockCurr = 0;
+ if (rgKeyBlocks.Count > 0) {
+ kbCurr = (KeyBlock) rgKeyBlocks [0];
+ foreach (object key in rgKeys)
+ {
+ bool fNextBlock = (key is UInt64) ? (ulong) key > (ulong) kbCurr.nLast :
+ System.Convert.ToInt64 (key) > kbCurr.nLast;
+ if (fNextBlock)
+ kbCurr = (KeyBlock) rgKeyBlocks [++iBlockCurr];
+ kbCurr.rgKeys.Add (key);
+ }
+ }
+
+ // sort the blocks so we can tackle the largest ones first
+ rgKeyBlocks.Sort ();
+
+ // okay now we can start...
+ ILGenerator ig = ec.ig;
+ Label lblEnd = ig.DefineLabel (); // at the end ;-)
+ Label lblDefault = ig.DefineLabel ();
+
+ Type typeKeys = null;
+ if (rgKeys.Length > 0)
+ typeKeys = rgKeys [0].GetType (); // used for conversions
+
+ Type compare_type;
+
+ if (TypeManager.IsEnumType (SwitchType))
+ compare_type = TypeManager.EnumToUnderlying (SwitchType);
+ else
+ compare_type = SwitchType;
+
+ for (int iBlock = rgKeyBlocks.Count - 1; iBlock >= 0; --iBlock)
+ {
+ KeyBlock kb = ((KeyBlock) rgKeyBlocks [iBlock]);
+ lblDefault = (iBlock == 0) ? DefaultTarget : ig.DefineLabel ();
+ if (kb.Length <= 2)
+ {
+ foreach (object key in kb.rgKeys)
+ {
+ ig.Emit (OpCodes.Ldloc, val);
+ EmitObjectInteger (ig, key);
+ SwitchLabel sl = (SwitchLabel) Elements [key];
+ ig.Emit (OpCodes.Beq, sl.GetILLabel (ec));
+ }
+ }
+ else
+ {
+ // TODO: if all the keys in the block are the same and there are
+ // no gaps/defaults then just use a range-check.
+ if (compare_type == TypeManager.int64_type ||
+ compare_type == TypeManager.uint64_type)
+ {
+ // TODO: optimize constant/I4 cases
+
+ // check block range (could be > 2^31)
+ ig.Emit (OpCodes.Ldloc, val);
+ EmitObjectInteger (ig, System.Convert.ChangeType (kb.nFirst, typeKeys));
+ ig.Emit (OpCodes.Blt, lblDefault);
+ ig.Emit (OpCodes.Ldloc, val);
+ EmitObjectInteger (ig, System.Convert.ChangeType (kb.nLast, typeKeys));
+ ig.Emit (OpCodes.Bgt, lblDefault);
+
+ // normalize range
+ ig.Emit (OpCodes.Ldloc, val);
+ if (kb.nFirst != 0)
+ {
+ EmitObjectInteger (ig, System.Convert.ChangeType (kb.nFirst, typeKeys));
+ ig.Emit (OpCodes.Sub);
+ }
+ ig.Emit (OpCodes.Conv_I4); // assumes < 2^31 labels!
+ }
+ else
+ {
+ // normalize range
+ ig.Emit (OpCodes.Ldloc, val);
+ int nFirst = (int) kb.nFirst;
+ if (nFirst > 0)
+ {
+ IntConstant.EmitInt (ig, nFirst);
+ ig.Emit (OpCodes.Sub);
+ }
+ else if (nFirst < 0)
+ {
+ IntConstant.EmitInt (ig, -nFirst);
+ ig.Emit (OpCodes.Add);
+ }
+ }
+
+ // first, build the list of labels for the switch
+ int iKey = 0;
+ int cJumps = kb.Length;
+ Label [] rgLabels = new Label [cJumps];
+ for (int iJump = 0; iJump < cJumps; iJump++)
+ {
+ object key = kb.rgKeys [iKey];
+ if (System.Convert.ToInt64 (key) == kb.nFirst + iJump)
+ {
+ SwitchLabel sl = (SwitchLabel) Elements [key];
+ rgLabels [iJump] = sl.GetILLabel (ec);
+ iKey++;
+ }
+ else
+ rgLabels [iJump] = lblDefault;
+ }
+ // emit the switch opcode
+ ig.Emit (OpCodes.Switch, rgLabels);
+ }
+
+ // mark the default for this block
+ if (iBlock != 0)
+ ig.MarkLabel (lblDefault);
+ }
+
+ // TODO: find the default case and emit it here,
+ // to prevent having to do the following jump.
+ // make sure to mark other labels in the default section
+
+ // the last default just goes to the end
+ ig.Emit (OpCodes.Br, lblDefault);
+
+ // now emit the code for the sections
+ bool fFoundDefault = false;
+ bool fFoundNull = false;
+ foreach (SwitchSection ss in Sections)
+ {
+ foreach (SwitchLabel sl in ss.Labels)
+ if (sl.Converted == SwitchLabel.NullStringCase)
+ fFoundNull = true;
+ }
+
+ foreach (SwitchSection ss in Sections)
+ {
+ foreach (SwitchLabel sl in ss.Labels)
+ {
+ ig.MarkLabel (sl.GetILLabel (ec));
+ ig.MarkLabel (sl.GetILLabelCode (ec));
+ if (sl.Converted == SwitchLabel.NullStringCase)
+ ig.MarkLabel (null_target);
+ else if (sl.Label == null) {
+ ig.MarkLabel (lblDefault);
+ fFoundDefault = true;
+ if (!fFoundNull)
+ ig.MarkLabel (null_target);
+ }
+ }
+ ss.Block.Emit (ec);
+ }
+
+ if (!fFoundDefault) {
+ ig.MarkLabel (lblDefault);
+ }
+ ig.MarkLabel (lblEnd);
+ }
+ //
+ // This simple emit switch works, but does not take advantage of the
+ // `switch' opcode.
+ // TODO: remove non-string logic from here
+ // TODO: binary search strings?
+ //
+ void SimpleSwitchEmit (EmitContext ec, LocalBuilder val)
+ {
+ ILGenerator ig = ec.ig;
+ Label end_of_switch = ig.DefineLabel ();
+ Label next_test = ig.DefineLabel ();
+ bool first_test = true;
+ bool pending_goto_end = false;
+ bool null_marked = false;
+ bool null_found;
+
+ ig.Emit (OpCodes.Ldloc, val);
+
+ if (Elements.Contains (SwitchLabel.NullStringCase)){
+ ig.Emit (OpCodes.Brfalse, null_target);
+ } else
+ ig.Emit (OpCodes.Brfalse, default_target);
+
+ ig.Emit (OpCodes.Ldloc, val);
+ ig.Emit (OpCodes.Call, TypeManager.string_isinterneted_string);
+ ig.Emit (OpCodes.Stloc, val);
+
+ int section_count = Sections.Count;
+ for (int section = 0; section < section_count; section++){
+ SwitchSection ss = (SwitchSection) Sections [section];
+
+ if (ss == default_section)
+ continue;
+
+ Label sec_begin = ig.DefineLabel ();
+
+ ig.Emit (OpCodes.Nop);
+
+ if (pending_goto_end)
+ ig.Emit (OpCodes.Br, end_of_switch);
+
+ int label_count = ss.Labels.Count;
+ null_found = false;
+ for (int label = 0; label < label_count; label++){
+ SwitchLabel sl = (SwitchLabel) ss.Labels [label];
+ ig.MarkLabel (sl.GetILLabel (ec));
+
+ if (!first_test){
+ ig.MarkLabel (next_test);
+ next_test = ig.DefineLabel ();
+ }
+ //
+ // If we are the default target
+ //
+ if (sl.Label != null){
+ object lit = sl.Converted;
+
+ if (lit == SwitchLabel.NullStringCase){
+ null_found = true;
+ if (label + 1 == label_count)
+ ig.Emit (OpCodes.Br, next_test);
+ continue;
+ }
+
+ ig.Emit (OpCodes.Ldloc, val);
+ ig.Emit (OpCodes.Ldstr, (string)lit);
+ if (label_count == 1)
+ ig.Emit (OpCodes.Bne_Un, next_test);
+ else {
+ if (label+1 == label_count)
+ ig.Emit (OpCodes.Bne_Un, next_test);
+ else
+ ig.Emit (OpCodes.Beq, sec_begin);
+ }
+ }
+ }
+ if (null_found) {
+ ig.MarkLabel (null_target);
+ null_marked = true;
+ }
+ ig.MarkLabel (sec_begin);
+ foreach (SwitchLabel sl in ss.Labels)
+ ig.MarkLabel (sl.GetILLabelCode (ec));
+
+ ss.Block.Emit (ec);
+ pending_goto_end = !ss.Block.HasRet;
+ first_test = false;
+ }
+ ig.MarkLabel (next_test);
+ ig.MarkLabel (default_target);
+ if (!null_marked)
+ ig.MarkLabel (null_target);
+ if (default_section != null)
+ default_section.Block.Emit (ec);
+ ig.MarkLabel (end_of_switch);
+ }
+
+ SwitchSection FindSection (SwitchLabel label)
+ {
+ foreach (SwitchSection ss in Sections){
+ foreach (SwitchLabel sl in ss.Labels){
+ if (label == sl)
+ return ss;
+ }
+ }
+
+ return null;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ Expr = Expr.Resolve (ec);
+ if (Expr == null)
+ return false;
+
+ new_expr = SwitchGoverningType (ec, Expr);
+
+#if GMCS_SOURCE
+ if ((new_expr == null) && TypeManager.IsNullableType (Expr.Type)) {
+ unwrap = Nullable.Unwrap.Create (Expr, ec);
+ if (unwrap == null)
+ return false;
+
+ new_expr = SwitchGoverningType (ec, unwrap);
+ }
+#endif
+
+ if (new_expr == null){
+ Report.Error (151, loc, "A value of an integral type or string expected for switch");
+ return false;
+ }
+
+ // Validate switch.
+ SwitchType = new_expr.Type;
+
+ if (!CheckSwitch (ec))
+ return false;
+
+ if (HaveUnwrap)
+ Elements.Remove (SwitchLabel.NullStringCase);
+
+ Switch old_switch = ec.Switch;
+ ec.Switch = this;
+ ec.Switch.SwitchType = SwitchType;
+
+ Report.Debug (1, "START OF SWITCH BLOCK", loc, ec.CurrentBranching);
+ ec.StartFlowBranching (FlowBranching.BranchingType.Switch, loc);
+
+ is_constant = new_expr is Constant;
+ if (is_constant) {
+ object key = ((Constant) new_expr).GetValue ();
+ SwitchLabel label = (SwitchLabel) Elements [key];
+
+ constant_section = FindSection (label);
+ if (constant_section == null)
+ constant_section = default_section;
+ }
+
+ bool first = true;
+ foreach (SwitchSection ss in Sections){
+ if (!first)
+ ec.CurrentBranching.CreateSibling (
+ null, FlowBranching.SiblingType.SwitchSection);
+ else
+ first = false;
+
+ if (is_constant && (ss != constant_section)) {
+ // If we're a constant switch, we're only emitting
+ // one single section - mark all the others as
+ // unreachable.
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+ if (!ss.Block.ResolveUnreachable (ec, true))
+ return false;
+ } else {
+ if (!ss.Block.Resolve (ec))
+ return false;
+ }
+ }
+
+ if (default_section == null)
+ ec.CurrentBranching.CreateSibling (
+ null, FlowBranching.SiblingType.SwitchSection);
+
+ FlowBranching.Reachability reachability = ec.EndFlowBranching ();
+ ec.Switch = old_switch;
+
+ Report.Debug (1, "END OF SWITCH BLOCK", loc, ec.CurrentBranching,
+ reachability);
+
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ default_target = ig.DefineLabel ();
+ null_target = ig.DefineLabel ();
+
+ // Store variable for comparission purposes
+ LocalBuilder value;
+ if (HaveUnwrap) {
+ value = ig.DeclareLocal (SwitchType);
+#if GMCS_SOURCE
+ unwrap.EmitCheck (ec);
+ ig.Emit (OpCodes.Brfalse, null_target);
+ new_expr.Emit (ec);
+ ig.Emit (OpCodes.Stloc, value);
+#endif
+ } else if (!is_constant) {
+ value = ig.DeclareLocal (SwitchType);
+ new_expr.Emit (ec);
+ ig.Emit (OpCodes.Stloc, value);
+ } else
+ value = null;
+
+ //
+ // Setup the codegen context
+ //
+ Label old_end = ec.LoopEnd;
+ Switch old_switch = ec.Switch;
+
+ ec.LoopEnd = ig.DefineLabel ();
+ ec.Switch = this;
+
+ // Emit Code.
+ if (is_constant) {
+ if (constant_section != null)
+ constant_section.Block.Emit (ec);
+ } else if (SwitchType == TypeManager.string_type)
+ SimpleSwitchEmit (ec, value);
+ else
+ TableSwitchEmit (ec, value);
+
+ // Restore context state.
+ ig.MarkLabel (ec.LoopEnd);
+
+ //
+ // Restore the previous context
+ //
+ ec.LoopEnd = old_end;
+ ec.Switch = old_switch;
+ }
+ }
+
+ public abstract class ExceptionStatement : Statement
+ {
+ public abstract void EmitFinally (EmitContext ec);
+
+ protected bool emit_finally = true;
+ ArrayList parent_vectors;
+
+ protected void DoEmitFinally (EmitContext ec)
+ {
+ if (emit_finally)
+ ec.ig.BeginFinallyBlock ();
+ else if (ec.InIterator)
+ ec.CurrentIterator.MarkFinally (ec, parent_vectors);
+ EmitFinally (ec);
+ }
+
+ protected void ResolveFinally (FlowBranchingException branching)
+ {
+ emit_finally = branching.EmitFinally;
+ if (!emit_finally)
+ branching.Parent.StealFinallyClauses (ref parent_vectors);
+ }
+ }
+
+ public class Lock : ExceptionStatement {
+ Expression expr;
+ public Statement Statement;
+ TemporaryVariable temp;
+
+ public Lock (Expression expr, Statement stmt, Location l)
+ {
+ this.expr = expr;
+ Statement = stmt;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return false;
+
+ if (expr.Type.IsValueType){
+ Report.Error (185, loc,
+ "`{0}' is not a reference type as required by the lock statement",
+ TypeManager.CSharpName (expr.Type));
+ return false;
+ }
+
+ FlowBranchingException branching = ec.StartFlowBranching (this);
+ bool ok = Statement.Resolve (ec);
+ if (!ok) {
+ ec.KillFlowBranching ();
+ return false;
+ }
+
+ ResolveFinally (branching);
+
+ FlowBranching.Reachability reachability = ec.EndFlowBranching ();
+ if (!reachability.AlwaysReturns) {
+ // Unfortunately, System.Reflection.Emit automatically emits
+ // a leave to the end of the finally block.
+ // This is a problem if `returns' is true since we may jump
+ // to a point after the end of the method.
+ // As a workaround, emit an explicit ret here.
+ ec.NeedReturnLabel ();
+ }
+
+ // Avoid creating libraries that reference the internal
+ // mcs NullType:
+ Type t = expr.Type;
+ if (t == TypeManager.null_type)
+ t = TypeManager.object_type;
+
+ temp = new TemporaryVariable (t, loc);
+ temp.Resolve (ec);
+
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ temp.Store (ec, expr);
+ temp.Emit (ec);
+ ig.Emit (OpCodes.Call, TypeManager.void_monitor_enter_object);
+
+ // try
+ if (emit_finally)
+ ig.BeginExceptionBlock ();
+ Statement.Emit (ec);
+
+ // finally
+ DoEmitFinally (ec);
+ if (emit_finally)
+ ig.EndExceptionBlock ();
+ }
+
+ public override void EmitFinally (EmitContext ec)
+ {
+ temp.Emit (ec);
+ ec.ig.Emit (OpCodes.Call, TypeManager.void_monitor_exit_object);
+ }
+ }
+
+ public class Unchecked : Statement {
+ public readonly Block Block;
+
+ public Unchecked (Block b)
+ {
+ Block = b;
+ b.Unchecked = true;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
+ return Block.Resolve (ec);
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
+ Block.Emit (ec);
+ }
+ }
+
+ public class Checked : Statement {
+ public readonly Block Block;
+
+ public Checked (Block b)
+ {
+ Block = b;
+ b.Unchecked = false;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
+ return Block.Resolve (ec);
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
+ Block.Emit (ec);
+ }
+ }
+
+ public class Unsafe : Statement {
+ public readonly Block Block;
+
+ public Unsafe (Block b)
+ {
+ Block = b;
+ Block.Unsafe = true;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.InUnsafe, true))
+ return Block.Resolve (ec);
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.InUnsafe, true))
+ Block.Emit (ec);
+ }
+ }
+
+ //
+ // Fixed statement
+ //
+ public class Fixed : Statement {
+ Expression type;
+ ArrayList declarators;
+ Statement statement;
+ Type expr_type;
+ Emitter[] data;
+ bool has_ret;
+
+ abstract class Emitter
+ {
+ protected LocalInfo vi;
+ protected Expression converted;
+
+ protected Emitter (Expression expr, LocalInfo li)
+ {
+ converted = expr;
+ vi = li;
+ }
+
+ public abstract void Emit (EmitContext ec);
+ public abstract void EmitExit (EmitContext ec);
+ }
+
+ class ExpressionEmitter : Emitter {
+ public ExpressionEmitter (Expression converted, LocalInfo li) :
+ base (converted, li)
+ {
+ }
+
+ public override void Emit (EmitContext ec) {
+ //
+ // Store pointer in pinned location
+ //
+ converted.Emit (ec);
+ vi.Variable.EmitAssign (ec);
+ }
+
+ public override void EmitExit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
+ ec.ig.Emit (OpCodes.Conv_U);
+ vi.Variable.EmitAssign (ec);
+ }
+ }
+
+ class StringEmitter : Emitter {
+ LocalBuilder pinned_string;
+ Location loc;
+
+ public StringEmitter (Expression expr, LocalInfo li, Location loc):
+ base (expr, li)
+ {
+ this.loc = loc;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ pinned_string = TypeManager.DeclareLocalPinned (ig, TypeManager.string_type);
+
+ converted.Emit (ec);
+ ig.Emit (OpCodes.Stloc, pinned_string);
+
+ Expression sptr = new StringPtr (pinned_string, loc);
+ converted = Convert.ImplicitConversionRequired (
+ ec, sptr, vi.VariableType, loc);
+
+ if (converted == null)
+ return;
+
+ converted.Emit (ec);
+ vi.Variable.EmitAssign (ec);
+ }
+
+ public override void EmitExit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldnull);
+ ec.ig.Emit (OpCodes.Stloc, pinned_string);
+ }
+ }
+
+ public Fixed (Expression type, ArrayList decls, Statement stmt, Location l)
+ {
+ this.type = type;
+ declarators = decls;
+ statement = stmt;
+ loc = l;
+ }
+
+ public Statement Statement {
+ get { return statement; }
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ if (!ec.InUnsafe){
+ Expression.UnsafeError (loc);
+ return false;
+ }
+
+ TypeExpr texpr = type.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return false;
+
+ expr_type = texpr.Type;
+
+ data = new Emitter [declarators.Count];
+
+ if (!expr_type.IsPointer){
+ Report.Error (209, loc, "The type of locals declared in a fixed statement must be a pointer type");
+ return false;
+ }
+
+ int i = 0;
+ foreach (Pair p in declarators){
+ LocalInfo vi = (LocalInfo) p.First;
+ Expression e = (Expression) p.Second;
+
+ vi.VariableInfo.SetAssigned (ec);
+ vi.SetReadOnlyContext (LocalInfo.ReadOnlyContext.Fixed);
+
+ //
+ // The rules for the possible declarators are pretty wise,
+ // but the production on the grammar is more concise.
+ //
+ // So we have to enforce these rules here.
+ //
+ // We do not resolve before doing the case 1 test,
+ // because the grammar is explicit in that the token &
+ // is present, so we need to test for this particular case.
+ //
+
+ if (e is Cast){
+ Report.Error (254, loc, "The right hand side of a fixed statement assignment may not be a cast expression");
+ return false;
+ }
+
+ //
+ // Case 1: & object.
+ //
+ if (e is Unary && ((Unary) e).Oper == Unary.Operator.AddressOf){
+ Expression child = ((Unary) e).Expr;
+
+ if (child is ParameterReference || child is LocalVariableReference){
+ Report.Error (
+ 213, loc,
+ "No need to use fixed statement for parameters or " +
+ "local variable declarations (address is already " +
+ "fixed)");
+ return false;
+ }
+
+ ec.InFixedInitializer = true;
+ e = e.Resolve (ec);
+ ec.InFixedInitializer = false;
+ if (e == null)
+ return false;
+
+ child = ((Unary) e).Expr;
+
+ if (!TypeManager.VerifyUnManaged (child.Type, loc))
+ return false;
+
+ if (!Convert.ImplicitConversionExists (ec, e, expr_type)) {
+ e.Error_ValueCannotBeConverted (e.Location, expr_type, false);
+ return false;
+ }
+
+ data [i] = new ExpressionEmitter (e, vi);
+ i++;
+
+ continue;
+ }
+
+ ec.InFixedInitializer = true;
+ e = e.Resolve (ec);
+ ec.InFixedInitializer = false;
+ if (e == null)
+ return false;
+
+ //
+ // Case 2: Array
+ //
+ if (e.Type.IsArray){
+ Type array_type = TypeManager.GetElementType (e.Type);
+
+ //
+ // Provided that array_type is unmanaged,
+ //
+ if (!TypeManager.VerifyUnManaged (array_type, loc))
+ return false;
+
+ //
+ // and T* is implicitly convertible to the
+ // pointer type given in the fixed statement.
+ //
+ ArrayPtr array_ptr = new ArrayPtr (e, array_type, loc);
+
+ Expression converted = Convert.ImplicitConversionRequired (
+ ec, array_ptr, vi.VariableType, loc);
+ if (converted == null)
+ return false;
+
+ data [i] = new ExpressionEmitter (converted, vi);
+ i++;
+
+ continue;
+ }
+
+ //
+ // Case 3: string
+ //
+ if (e.Type == TypeManager.string_type){
+ data [i] = new StringEmitter (e, vi, loc);
+ i++;
+ continue;
+ }
+
+ // Case 4: fixed buffer
+ FieldExpr fe = e as FieldExpr;
+ if (fe != null) {
+ IFixedBuffer ff = AttributeTester.GetFixedBuffer (fe.FieldInfo);
+ if (ff != null) {
+ Expression fixed_buffer_ptr = new FixedBufferPtr (fe, ff.ElementType, loc);
+
+ Expression converted = Convert.ImplicitConversionRequired (
+ ec, fixed_buffer_ptr, vi.VariableType, loc);
+ if (converted == null)
+ return false;
+
+ data [i] = new ExpressionEmitter (converted, vi);
+ i++;
+
+ continue;
+ }
+ }
+
+ //
+ // For other cases, flag a `this is already fixed expression'
+ //
+ if (e is LocalVariableReference || e is ParameterReference ||
+ Convert.ImplicitConversionExists (ec, e, vi.VariableType)){
+
+ Report.Error (245, loc, "right hand expression is already fixed, no need to use fixed statement ");
+ return false;
+ }
+
+ Report.Error (245, loc, "Fixed statement only allowed on strings, arrays or address-of expressions");
+ return false;
+ }
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Conditional, loc);
+
+ if (!statement.Resolve (ec)) {
+ ec.KillFlowBranching ();
+ return false;
+ }
+
+ FlowBranching.Reachability reachability = ec.EndFlowBranching ();
+ has_ret = reachability.IsUnreachable;
+
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ for (int i = 0; i < data.Length; i++) {
+ data [i].Emit (ec);
+ }
+
+ statement.Emit (ec);
+
+ if (has_ret)
+ return;
+
+ //
+ // Clear the pinned variable
+ //
+ for (int i = 0; i < data.Length; i++) {
+ data [i].EmitExit (ec);
+ }
+ }
+ }
+
+ public class Catch : Statement {
+ public readonly string Name;
+ public readonly Block Block;
+ public readonly Block VarBlock;
+
+ Expression type_expr;
+ Type type;
+
+ public Catch (Expression type, string name, Block block, Block var_block, Location l)
+ {
+ type_expr = type;
+ Name = name;
+ Block = block;
+ VarBlock = var_block;
+ loc = l;
+ }
+
+ public Type CatchType {
+ get {
+ return type;
+ }
+ }
+
+ public bool IsGeneral {
+ get {
+ return type_expr == null;
+ }
+ }
+
+ protected override void DoEmit(EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ if (CatchType != null)
+ ig.BeginCatchBlock (CatchType);
+ else
+ ig.BeginCatchBlock (TypeManager.object_type);
+
+ if (VarBlock != null)
+ VarBlock.Emit (ec);
+
+ if (Name != null) {
+ LocalInfo vi = Block.GetLocalInfo (Name);
+ if (vi == null)
+ throw new Exception ("Variable does not exist in this block");
+
+ if (vi.Variable.NeedsTemporary) {
+ LocalBuilder e = ig.DeclareLocal (vi.VariableType);
+ ig.Emit (OpCodes.Stloc, e);
+
+ vi.Variable.EmitInstance (ec);
+ ig.Emit (OpCodes.Ldloc, e);
+ vi.Variable.EmitAssign (ec);
+ } else
+ vi.Variable.EmitAssign (ec);
+ } else
+ ig.Emit (OpCodes.Pop);
+
+ Block.Emit (ec);
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ using (ec.With (EmitContext.Flags.InCatch, true)) {
+ if (type_expr != null) {
+ TypeExpr te = type_expr.ResolveAsTypeTerminal (ec, false);
+ if (te == null)
+ return false;
+
+ type = te.Type;
+
+ if (type != TypeManager.exception_type && !type.IsSubclassOf (TypeManager.exception_type)){
+ Error (155, "The type caught or thrown must be derived from System.Exception");
+ return false;
+ }
+ } else
+ type = null;
+
+ if (!Block.Resolve (ec))
+ return false;
+
+ // Even though VarBlock surrounds 'Block' we resolve it later, so that we can correctly
+ // emit the "unused variable" warnings.
+ if (VarBlock != null)
+ return VarBlock.Resolve (ec);
+
+ return true;
+ }
+ }
+ }
+
+ public class Try : ExceptionStatement {
+ public readonly Block Fini, Block;
+ public readonly ArrayList Specific;
+ public readonly Catch General;
+
+ bool need_exc_block;
+
+ //
+ // specific, general and fini might all be null.
+ //
+ public Try (Block block, ArrayList specific, Catch general, Block fini, Location l)
+ {
+ if (specific == null && general == null){
+ Console.WriteLine ("CIR.Try: Either specific or general have to be non-null");
+ }
+
+ this.Block = block;
+ this.Specific = specific;
+ this.General = general;
+ this.Fini = fini;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ bool ok = true;
+
+ FlowBranchingException branching = ec.StartFlowBranching (this);
+
+ Report.Debug (1, "START OF TRY BLOCK", Block.StartLocation);
+
+ if (!Block.Resolve (ec))
+ ok = false;
+
+ FlowBranching.UsageVector vector = ec.CurrentBranching.CurrentUsageVector;
+
+ Report.Debug (1, "START OF CATCH BLOCKS", vector);
+
+ Type[] prevCatches = new Type [Specific.Count];
+ int last_index = 0;
+ foreach (Catch c in Specific){
+ ec.CurrentBranching.CreateSibling (
+ c.Block, FlowBranching.SiblingType.Catch);
+
+ Report.Debug (1, "STARTED SIBLING FOR CATCH", ec.CurrentBranching);
+
+ if (c.Name != null) {
+ LocalInfo vi = c.Block.GetLocalInfo (c.Name);
+ if (vi == null)
+ throw new Exception ();
+
+ vi.VariableInfo = null;
+ }
+
+ if (!c.Resolve (ec))
+ return false;
+
+ Type resolvedType = c.CatchType;
+ for (int ii = 0; ii < last_index; ++ii) {
+ if (resolvedType == prevCatches [ii] || resolvedType.IsSubclassOf (prevCatches [ii])) {
+ Report.Error (160, c.loc, "A previous catch clause already catches all exceptions of this or a super type `{0}'", prevCatches [ii].FullName);
+ return false;
+ }
+ }
+
+ prevCatches [last_index++] = resolvedType;
+ need_exc_block = true;
+ }
+
+ Report.Debug (1, "END OF CATCH BLOCKS", ec.CurrentBranching);
+
+ if (General != null){
+ if (CodeGen.Assembly.WrapNonExceptionThrows) {
+ foreach (Catch c in Specific){
+ if (c.CatchType == TypeManager.exception_type) {
+ Report.Warning (1058, 1, c.loc, "A previous catch clause already catches all exceptions. All non-exceptions thrown will be wrapped in a `System.Runtime.CompilerServices.RuntimeWrappedException'");
+ }
+ }
+ }
+
+ ec.CurrentBranching.CreateSibling (
+ General.Block, FlowBranching.SiblingType.Catch);
+
+ Report.Debug (1, "STARTED SIBLING FOR GENERAL", ec.CurrentBranching);
+
+ if (!General.Resolve (ec))
+ ok = false;
+
+ need_exc_block = true;
+ }
+
+ Report.Debug (1, "END OF GENERAL CATCH BLOCKS", ec.CurrentBranching);
+
+ if (Fini != null) {
+ if (ok)
+ ec.CurrentBranching.CreateSibling (Fini, FlowBranching.SiblingType.Finally);
+
+ Report.Debug (1, "STARTED SIBLING FOR FINALLY", ec.CurrentBranching, vector);
+ using (ec.With (EmitContext.Flags.InFinally, true)) {
+ if (!Fini.Resolve (ec))
+ ok = false;
+ }
+
+ if (!ec.InIterator)
+ need_exc_block = true;
+ }
+
+ if (ec.InIterator) {
+ ResolveFinally (branching);
+ need_exc_block |= emit_finally;
+ } else
+ emit_finally = Fini != null;
+
+ FlowBranching.Reachability reachability = ec.EndFlowBranching ();
+
+ FlowBranching.UsageVector f_vector = ec.CurrentBranching.CurrentUsageVector;
+
+ Report.Debug (1, "END OF TRY", ec.CurrentBranching, reachability, vector, f_vector);
+
+ if (!reachability.AlwaysReturns) {
+ // Unfortunately, System.Reflection.Emit automatically emits
+ // a leave to the end of the finally block. This is a problem
+ // if `returns' is true since we may jump to a point after the
+ // end of the method.
+ // As a workaround, emit an explicit ret here.
+ ec.NeedReturnLabel ();
+ }
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ if (need_exc_block)
+ ig.BeginExceptionBlock ();
+ Block.Emit (ec);
+
+ foreach (Catch c in Specific)
+ c.Emit (ec);
+
+ if (General != null)
+ General.Emit (ec);
+
+ DoEmitFinally (ec);
+ if (need_exc_block)
+ ig.EndExceptionBlock ();
+ }
+
+ public override void EmitFinally (EmitContext ec)
+ {
+ if (Fini != null)
+ Fini.Emit (ec);
+ }
+
+ public bool HasCatch
+ {
+ get {
+ return General != null || Specific.Count > 0;
+ }
+ }
+ }
+
+ public class Using : ExceptionStatement {
+ object expression_or_block;
+ public Statement Statement;
+ ArrayList var_list;
+ Expression expr;
+ Type expr_type;
+ Expression [] resolved_vars;
+ Expression [] converted_vars;
+ ExpressionStatement [] assign;
+ TemporaryVariable local_copy;
+
+ public Using (object expression_or_block, Statement stmt, Location l)
+ {
+ this.expression_or_block = expression_or_block;
+ Statement = stmt;
+ loc = l;
+ }
+
+ //
+ // Resolves for the case of using using a local variable declaration.
+ //
+ bool ResolveLocalVariableDecls (EmitContext ec)
+ {
+ int i = 0;
+
+ TypeExpr texpr = expr.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return false;
+
+ expr_type = texpr.Type;
+
+ //
+ // The type must be an IDisposable or an implicit conversion
+ // must exist.
+ //
+ converted_vars = new Expression [var_list.Count];
+ resolved_vars = new Expression [var_list.Count];
+ assign = new ExpressionStatement [var_list.Count];
+
+ bool need_conv = !TypeManager.ImplementsInterface (
+ expr_type, TypeManager.idisposable_type);
+
+ foreach (DictionaryEntry e in var_list){
+ Expression var = (Expression) e.Key;
+
+ var = var.ResolveLValue (ec, new EmptyExpression (), loc);
+ if (var == null)
+ return false;
+
+ resolved_vars [i] = var;
+
+ if (!need_conv) {
+ i++;
+ continue;
+ }
+
+ converted_vars [i] = Convert.ImplicitConversion (
+ ec, var, TypeManager.idisposable_type, loc);
+
+ if (converted_vars [i] == null) {
+ Error_IsNotConvertibleToIDisposable ();
+ return false;
+ }
+
+ i++;
+ }
+
+ i = 0;
+ foreach (DictionaryEntry e in var_list){
+ Expression var = resolved_vars [i];
+ Expression new_expr = (Expression) e.Value;
+ Expression a;
+
+ a = new Assign (var, new_expr, loc);
+ a = a.Resolve (ec);
+ if (a == null)
+ return false;
+
+ if (!need_conv)
+ converted_vars [i] = var;
+ assign [i] = (ExpressionStatement) a;
+ i++;
+ }
+
+ return true;
+ }
+
+ void Error_IsNotConvertibleToIDisposable ()
+ {
+ Report.Error (1674, loc, "`{0}': type used in a using statement must be implicitly convertible to `System.IDisposable'",
+ TypeManager.CSharpName (expr_type));
+ }
+
+ bool ResolveExpression (EmitContext ec)
+ {
+ if (!TypeManager.ImplementsInterface (expr_type, TypeManager.idisposable_type)){
+ if (Convert.ImplicitConversion (ec, expr, TypeManager.idisposable_type, loc) == null) {
+ Error_IsNotConvertibleToIDisposable ();
+ return false;
+ }
+ }
+
+ local_copy = new TemporaryVariable (expr_type, loc);
+ local_copy.Resolve (ec);
+
+ return true;
+ }
+
+ //
+ // Emits the code for the case of using using a local variable declaration.
+ //
+ void EmitLocalVariableDecls (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ int i = 0;
+
+ for (i = 0; i < assign.Length; i++) {
+ assign [i].EmitStatement (ec);
+
+ if (emit_finally)
+ ig.BeginExceptionBlock ();
+ }
+ Statement.Emit (ec);
+
+ var_list.Reverse ();
+
+ DoEmitFinally (ec);
+ }
+
+ void EmitLocalVariableDeclFinally (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ int i = assign.Length;
+ for (int ii = 0; ii < var_list.Count; ++ii){
+ Expression var = resolved_vars [--i];
+ Label skip = ig.DefineLabel ();
+
+ if (emit_finally)
+ ig.BeginFinallyBlock ();
+
+ if (!var.Type.IsValueType) {
+ var.Emit (ec);
+ ig.Emit (OpCodes.Brfalse, skip);
+ converted_vars [i].Emit (ec);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ } else {
+ Expression ml = Expression.MemberLookup(ec.ContainerType, TypeManager.idisposable_type, var.Type, "Dispose", Mono.CSharp.Location.Null);
+
+ if (!(ml is MethodGroupExpr)) {
+ var.Emit (ec);
+ ig.Emit (OpCodes.Box, var.Type);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ } else {
+ MethodInfo mi = null;
+
+ foreach (MethodInfo mk in ((MethodGroupExpr) ml).Methods) {
+ if (TypeManager.GetParameterData (mk).Count == 0) {
+ mi = mk;
+ break;
+ }
+ }
+
+ if (mi == null) {
+ Report.Error(-100, Mono.CSharp.Location.Null, "Internal error: No Dispose method which takes 0 parameters.");
+ return;
+ }
+
+ IMemoryLocation mloc = (IMemoryLocation) var;
+
+ mloc.AddressOf (ec, AddressOp.Load);
+ ig.Emit (OpCodes.Call, mi);
+ }
+ }
+
+ ig.MarkLabel (skip);
+
+ if (emit_finally) {
+ ig.EndExceptionBlock ();
+ if (i > 0)
+ ig.BeginFinallyBlock ();
+ }
+ }
+ }
+
+ void EmitExpression (EmitContext ec)
+ {
+ //
+ // Make a copy of the expression and operate on that.
+ //
+ ILGenerator ig = ec.ig;
+
+ local_copy.Store (ec, expr);
+
+ if (emit_finally)
+ ig.BeginExceptionBlock ();
+
+ Statement.Emit (ec);
+
+ DoEmitFinally (ec);
+ if (emit_finally)
+ ig.EndExceptionBlock ();
+ }
+
+ void EmitExpressionFinally (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ if (!expr_type.IsValueType) {
+ Label skip = ig.DefineLabel ();
+ local_copy.Emit (ec);
+ ig.Emit (OpCodes.Brfalse, skip);
+ local_copy.Emit (ec);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ ig.MarkLabel (skip);
+ } else {
+ Expression ml = Expression.MemberLookup (
+ ec.ContainerType, TypeManager.idisposable_type, expr_type,
+ "Dispose", Location.Null);
+
+ if (!(ml is MethodGroupExpr)) {
+ local_copy.Emit (ec);
+ ig.Emit (OpCodes.Box, expr_type);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ } else {
+ MethodInfo mi = null;
+
+ foreach (MethodInfo mk in ((MethodGroupExpr) ml).Methods) {
+ if (TypeManager.GetParameterData (mk).Count == 0) {
+ mi = mk;
+ break;
+ }
+ }
+
+ if (mi == null) {
+ Report.Error(-100, Mono.CSharp.Location.Null, "Internal error: No Dispose method which takes 0 parameters.");
+ return;
+ }
+
+ local_copy.AddressOf (ec, AddressOp.Load);
+ ig.Emit (OpCodes.Call, mi);
+ }
+ }
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ if (expression_or_block is DictionaryEntry){
+ expr = (Expression) ((DictionaryEntry) expression_or_block).Key;
+ var_list = (ArrayList)((DictionaryEntry)expression_or_block).Value;
+
+ if (!ResolveLocalVariableDecls (ec))
+ return false;
+
+ } else if (expression_or_block is Expression){
+ expr = (Expression) expression_or_block;
+
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return false;
+
+ expr_type = expr.Type;
+
+ if (!ResolveExpression (ec))
+ return false;
+ }
+
+ FlowBranchingException branching = ec.StartFlowBranching (this);
+
+ bool ok = Statement.Resolve (ec);
+
+ if (!ok) {
+ ec.KillFlowBranching ();
+ return false;
+ }
+
+ ResolveFinally (branching);
+ FlowBranching.Reachability reachability = ec.EndFlowBranching ();
+
+ if (!reachability.AlwaysReturns) {
+ // Unfortunately, System.Reflection.Emit automatically emits a leave
+ // to the end of the finally block. This is a problem if `returns'
+ // is true since we may jump to a point after the end of the method.
+ // As a workaround, emit an explicit ret here.
+ ec.NeedReturnLabel ();
+ }
+
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ if (expression_or_block is DictionaryEntry)
+ EmitLocalVariableDecls (ec);
+ else if (expression_or_block is Expression)
+ EmitExpression (ec);
+ }
+
+ public override void EmitFinally (EmitContext ec)
+ {
+ if (expression_or_block is DictionaryEntry)
+ EmitLocalVariableDeclFinally (ec);
+ else if (expression_or_block is Expression)
+ EmitExpressionFinally (ec);
+ }
+ }
+
+ /// <summary>
+ /// Implementation of the foreach C# statement
+ /// </summary>
+ public class Foreach : Statement {
+ Expression type;
+ Expression variable;
+ Expression expr;
+ Statement statement;
+ ArrayForeach array;
+ CollectionForeach collection;
+
+ public Foreach (Expression type, LocalVariableReference var, Expression expr,
+ Statement stmt, Location l)
+ {
+ this.type = type;
+ this.variable = var;
+ this.expr = expr;
+ statement = stmt;
+ loc = l;
+ }
+
+ public Statement Statement {
+ get { return statement; }
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return false;
+
+ Constant c = expr as Constant;
+ if (c != null && c.GetValue () == null) {
+ Report.Error (186, loc, "Use of null is not valid in this context");
+ return false;
+ }
+
+ TypeExpr texpr = type.ResolveAsTypeTerminal (ec, false);
+ if (texpr == null)
+ return false;
+
+ Type var_type = texpr.Type;
+
+ if (expr.eclass == ExprClass.MethodGroup || expr is AnonymousMethodExpression) {
+ Report.Error (446, expr.Location, "Foreach statement cannot operate on a `{0}'",
+ expr.ExprClassName);
+ return false;
+ }
+
+ //
+ // We need an instance variable. Not sure this is the best
+ // way of doing this.
+ //
+ // FIXME: When we implement propertyaccess, will those turn
+ // out to return values in ExprClass? I think they should.
+ //
+ if (!(expr.eclass == ExprClass.Variable || expr.eclass == ExprClass.Value ||
+ expr.eclass == ExprClass.PropertyAccess || expr.eclass == ExprClass.IndexerAccess)){
+ collection.Error_Enumerator ();
+ return false;
+ }
+
+ if (expr.Type.IsArray) {
+ array = new ArrayForeach (var_type, variable, expr, statement, loc);
+ return array.Resolve (ec);
+ } else {
+ collection = new CollectionForeach (
+ var_type, variable, expr, statement, loc);
+ return collection.Resolve (ec);
+ }
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ Label old_begin = ec.LoopBegin, old_end = ec.LoopEnd;
+ ec.LoopBegin = ig.DefineLabel ();
+ ec.LoopEnd = ig.DefineLabel ();
+
+ if (collection != null)
+ collection.Emit (ec);
+ else
+ array.Emit (ec);
+
+ ec.LoopBegin = old_begin;
+ ec.LoopEnd = old_end;
+ }
+
+ protected class ArrayCounter : TemporaryVariable
+ {
+ public ArrayCounter (Location loc)
+ : base (TypeManager.int32_type, loc)
+ { }
+
+ public void Initialize (EmitContext ec)
+ {
+ EmitThis (ec);
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
+ EmitStore (ec);
+ }
+
+ public void Increment (EmitContext ec)
+ {
+ EmitThis (ec);
+ Emit (ec);
+ ec.ig.Emit (OpCodes.Ldc_I4_1);
+ ec.ig.Emit (OpCodes.Add);
+ EmitStore (ec);
+ }
+ }
+
+ protected class ArrayForeach : Statement
+ {
+ Expression variable, expr, conv;
+ Statement statement;
+ Type array_type;
+ Type var_type;
+ TemporaryVariable[] lengths;
+ ArrayCounter[] counter;
+ int rank;
+
+ TemporaryVariable copy;
+ Expression access;
+
+ public ArrayForeach (Type var_type, Expression var,
+ Expression expr, Statement stmt, Location l)
+ {
+ this.var_type = var_type;
+ this.variable = var;
+ this.expr = expr;
+ statement = stmt;
+ loc = l;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ array_type = expr.Type;
+ rank = array_type.GetArrayRank ();
+
+ copy = new TemporaryVariable (array_type, loc);
+ copy.Resolve (ec);
+
+ counter = new ArrayCounter [rank];
+ lengths = new TemporaryVariable [rank];
+
+ ArrayList list = new ArrayList ();
+ for (int i = 0; i < rank; i++) {
+ counter [i] = new ArrayCounter (loc);
+ counter [i].Resolve (ec);
+
+ lengths [i] = new TemporaryVariable (TypeManager.int32_type, loc);
+ lengths [i].Resolve (ec);
+
+ list.Add (counter [i]);
+ }
+
+ access = new ElementAccess (copy, list).Resolve (ec);
+ if (access == null)
+ return false;
+
+ conv = Convert.ExplicitConversion (ec, access, var_type, loc);
+ if (conv == null)
+ return false;
+
+ bool ok = true;
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Loop, loc);
+ ec.CurrentBranching.CreateSibling ();
+
+ variable = variable.ResolveLValue (ec, conv, loc);
+ if (variable == null)
+ ok = false;
+
+ ec.StartFlowBranching (FlowBranching.BranchingType.Embedded, loc);
+ if (!statement.Resolve (ec))
+ ok = false;
+ ec.EndFlowBranching ();
+
+ // There's no direct control flow from the end of the embedded statement to the end of the loop
+ ec.CurrentBranching.CurrentUsageVector.Goto ();
+
+ ec.EndFlowBranching ();
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ copy.Store (ec, expr);
+
+ Label[] test = new Label [rank];
+ Label[] loop = new Label [rank];
+
+ for (int i = 0; i < rank; i++) {
+ test [i] = ig.DefineLabel ();
+ loop [i] = ig.DefineLabel ();
+
+ lengths [i].EmitThis (ec);
+ ((ArrayAccess) access).EmitGetLength (ec, i);
+ lengths [i].EmitStore (ec);
+ }
+
+ for (int i = 0; i < rank; i++) {
+ counter [i].Initialize (ec);
+
+ ig.Emit (OpCodes.Br, test [i]);
+ ig.MarkLabel (loop [i]);
+ }
+
+ ((IAssignMethod) variable).EmitAssign (ec, conv, false, false);
+
+ statement.Emit (ec);
+
+ ig.MarkLabel (ec.LoopBegin);
+
+ for (int i = rank - 1; i >= 0; i--){
+ counter [i].Increment (ec);
+
+ ig.MarkLabel (test [i]);
+ counter [i].Emit (ec);
+ lengths [i].Emit (ec);
+ ig.Emit (OpCodes.Blt, loop [i]);
+ }
+
+ ig.MarkLabel (ec.LoopEnd);
+ }
+ }
+
+ protected class CollectionForeach : ExceptionStatement
+ {
+ Expression variable, expr;
+ Statement statement;
+
+ TemporaryVariable enumerator;
+ Expression init;
+ Statement loop;
+
+ MethodGroupExpr get_enumerator;
+ PropertyExpr get_current;
+ MethodInfo move_next;
+ Type var_type, enumerator_type;
+ bool is_disposable;
+ bool enumerator_found;
+
+ public CollectionForeach (Type var_type, Expression var,
+ Expression expr, Statement stmt, Location l)
+ {
+ this.var_type = var_type;
+ this.variable = var;
+ this.expr = expr;
+ statement = stmt;
+ loc = l;
+ }
+
+ bool GetEnumeratorFilter (EmitContext ec, MethodInfo mi)
+ {
+ Type return_type = mi.ReturnType;
+
+ if ((return_type == TypeManager.ienumerator_type) && (mi.DeclaringType == TypeManager.string_type))
+ //
+ // Apply the same optimization as MS: skip the GetEnumerator
+ // returning an IEnumerator, and use the one returning a
+ // CharEnumerator instead. This allows us to avoid the
+ // try-finally block and the boxing.
+ //
+ return false;
+
+ //
+ // Ok, we can access it, now make sure that we can do something
+ // with this `GetEnumerator'
+ //
+
+ if (return_type == TypeManager.ienumerator_type ||
+ TypeManager.ienumerator_type.IsAssignableFrom (return_type) ||
+ (!RootContext.StdLib && TypeManager.ImplementsInterface (return_type, TypeManager.ienumerator_type))) {
+ //
+ // If it is not an interface, lets try to find the methods ourselves.
+ // For example, if we have:
+ // public class Foo : IEnumerator { public bool MoveNext () {} public int Current { get {}}}
+ // We can avoid the iface call. This is a runtime perf boost.
+ // even bigger if we have a ValueType, because we avoid the cost
+ // of boxing.
+ //
+ // We have to make sure that both methods exist for us to take
+ // this path. If one of the methods does not exist, we will just
+ // use the interface. Sadly, this complex if statement is the only
+ // way I could do this without a goto
+ //
+
+#if GMCS_SOURCE
+ //
+ // Prefer a generic enumerator over a non-generic one.
+ //
+ if (return_type.IsInterface && return_type.IsGenericType) {
+ enumerator_type = return_type;
+ if (!FetchGetCurrent (ec, return_type))
+ get_current = new PropertyExpr (
+ ec.ContainerType, TypeManager.ienumerator_getcurrent, loc);
+ if (!FetchMoveNext (return_type))
+ move_next = TypeManager.bool_movenext_void;
+ return true;
+ }
+#endif
+
+ if (return_type.IsInterface ||
+ !FetchMoveNext (return_type) ||
+ !FetchGetCurrent (ec, return_type)) {
+ enumerator_type = return_type;
+ move_next = TypeManager.bool_movenext_void;
+ get_current = new PropertyExpr (
+ ec.ContainerType, TypeManager.ienumerator_getcurrent, loc);
+ return true;
+ }
+ } else {
+ //
+ // Ok, so they dont return an IEnumerable, we will have to
+ // find if they support the GetEnumerator pattern.
+ //
+
+ if (TypeManager.HasElementType (return_type) || !FetchMoveNext (return_type) || !FetchGetCurrent (ec, return_type)) {
+ Report.Error (202, loc, "foreach statement requires that the return type `{0}' of `{1}' must have a suitable public MoveNext method and public Current property",
+ TypeManager.CSharpName (return_type), TypeManager.CSharpSignature (mi));
+ return false;
+ }
+ }
+
+ enumerator_type = return_type;
+ is_disposable = !enumerator_type.IsSealed ||
+ TypeManager.ImplementsInterface (
+ enumerator_type, TypeManager.idisposable_type);
+
+ return true;
+ }
+
+ //
+ // Retrieves a `public bool MoveNext ()' method from the Type `t'
+ //
+ bool FetchMoveNext (Type t)
+ {
+ MemberList move_next_list;
+
+ move_next_list = TypeContainer.FindMembers (
+ t, MemberTypes.Method,
+ BindingFlags.Public | BindingFlags.Instance,
+ Type.FilterName, "MoveNext");
+ if (move_next_list.Count == 0)
+ return false;
+
+ foreach (MemberInfo m in move_next_list){
+ MethodInfo mi = (MethodInfo) m;
+
+ if ((TypeManager.GetParameterData (mi).Count == 0) &&
+ TypeManager.TypeToCoreType (mi.ReturnType) == TypeManager.bool_type) {
+ move_next = mi;
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ //
+ // Retrieves a `public T get_Current ()' method from the Type `t'
+ //
+ bool FetchGetCurrent (EmitContext ec, Type t)
+ {
+ PropertyExpr pe = Expression.MemberLookup (
+ ec.ContainerType, t, "Current", MemberTypes.Property,
+ Expression.AllBindingFlags, loc) as PropertyExpr;
+ if (pe == null)
+ return false;
+
+ get_current = pe;
+ return true;
+ }
+
+ //
+ // Retrieves a `public void Dispose ()' method from the Type `t'
+ //
+ static MethodInfo FetchMethodDispose (Type t)
+ {
+ MemberList dispose_list;
+
+ dispose_list = TypeContainer.FindMembers (
+ t, MemberTypes.Method,
+ BindingFlags.Public | BindingFlags.Instance,
+ Type.FilterName, "Dispose");
+ if (dispose_list.Count == 0)
+ return null;
+
+ foreach (MemberInfo m in dispose_list){
+ MethodInfo mi = (MethodInfo) m;
+
+ if (TypeManager.GetParameterData (mi).Count == 0){
+ if (mi.ReturnType == TypeManager.void_type)
+ return mi;
+ }
+ }
+ return null;
+ }
+
+ public void Error_Enumerator ()
+ {
+ if (enumerator_found) {
+ return;
+ }
+
+ Report.Error (1579, loc,
+ "foreach statement cannot operate on variables of type `{0}' because it does not contain a definition for `GetEnumerator' or is not accessible",
+ TypeManager.CSharpName (expr.Type));
+ }
+
+ bool TryType (EmitContext ec, Type t)
+ {
+ MethodGroupExpr mg = Expression.MemberLookup (
+ ec.ContainerType, t, "GetEnumerator", MemberTypes.Method,
+ Expression.AllBindingFlags, loc) as MethodGroupExpr;
+ if (mg == null)
+ return false;
+
+ MethodInfo result = null;
+ MethodInfo tmp_move_next = null;
+ PropertyExpr tmp_get_cur = null;
+ Type tmp_enumerator_type = enumerator_type;
+ foreach (MethodInfo mi in mg.Methods) {
+ if (TypeManager.GetParameterData (mi).Count != 0)
+ continue;
+
+ // Check whether GetEnumerator is public
+ if ((mi.Attributes & MethodAttributes.Public) != MethodAttributes.Public)
+ continue;
+
+ if (TypeManager.IsOverride (mi))
+ continue;
+
+ enumerator_found = true;
+
+ if (!GetEnumeratorFilter (ec, mi))
+ continue;
+
+ if (result != null) {
+ if (TypeManager.IsGenericType (result.ReturnType)) {
+ if (!TypeManager.IsGenericType (mi.ReturnType))
+ continue;
+
+ Report.SymbolRelatedToPreviousError(t);
+ Report.Error(1640, loc, "foreach statement cannot operate on variables of type `{0}' " +
+ "because it contains multiple implementation of `{1}'. Try casting to a specific implementation",
+ TypeManager.CSharpName (t), TypeManager.CSharpSignature (mi));
+ return false;
+ }
+ Report.SymbolRelatedToPreviousError (result);
+ Report.SymbolRelatedToPreviousError (mi);
+ Report.Warning (278, 2, loc, "`{0}' contains ambiguous implementation of `{1}' pattern. Method `{2}' is ambiguous with method `{3}'",
+ TypeManager.CSharpName (t), "enumerable", TypeManager.CSharpSignature (result), TypeManager.CSharpSignature (mi));
+ }
+ result = mi;
+ tmp_move_next = move_next;
+ tmp_get_cur = get_current;
+ tmp_enumerator_type = enumerator_type;
+ if (mi.DeclaringType == t)
+ break;
+ }
+
+ if (result != null) {
+ move_next = tmp_move_next;
+ get_current = tmp_get_cur;
+ enumerator_type = tmp_enumerator_type;
+ MethodInfo[] mi = new MethodInfo[] { (MethodInfo) result };
+ get_enumerator = new MethodGroupExpr (mi, loc);
+
+ if (t != expr.Type) {
+ expr = Convert.ExplicitConversion (
+ ec, expr, t, loc);
+ if (expr == null)
+ throw new InternalErrorException ();
+ }
+
+ get_enumerator.InstanceExpression = expr;
+ get_enumerator.IsBase = t != expr.Type;
+
+ return true;
+ }
+
+ return false;
+ }
+
+ bool ProbeCollectionType (EmitContext ec, Type t)
+ {
+ int errors = Report.Errors;
+ for (Type tt = t; tt != null && tt != TypeManager.object_type;){
+ if (TryType (ec, tt))
+ return true;
+ tt = tt.BaseType;
+ }
+
+ if (Report.Errors > errors)
+ return false;
+
+ //
+ // Now try to find the method in the interfaces
+ //
+ while (t != null){
+ Type [] ifaces = t.GetInterfaces ();
+
+ foreach (Type i in ifaces){
+ if (TryType (ec, i))
+ return true;
+ }
+
+ //
+ // Since TypeBuilder.GetInterfaces only returns the interface
+ // types for this type, we have to keep looping, but once
+ // we hit a non-TypeBuilder (ie, a Type), then we know we are
+ // done, because it returns all the types
+ //
+ if ((t is TypeBuilder))
+ t = t.BaseType;
+ else
+ break;
+ }
+
+ return false;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ enumerator_type = TypeManager.ienumerator_type;
+ is_disposable = true;
+
+ if (!ProbeCollectionType (ec, expr.Type)) {
+ Error_Enumerator ();
+ return false;
+ }
+
+ enumerator = new TemporaryVariable (enumerator_type, loc);
+ enumerator.Resolve (ec);
+
+ init = new Invocation (get_enumerator, new ArrayList ());
+ init = init.Resolve (ec);
+ if (init == null)
+ return false;
+
+ Expression move_next_expr;
+ {
+ MemberInfo[] mi = new MemberInfo[] { move_next };
+ MethodGroupExpr mg = new MethodGroupExpr (mi, loc);
+ mg.InstanceExpression = enumerator;
+
+ move_next_expr = new Invocation (mg, new ArrayList ());
+ }
+
+ get_current.InstanceExpression = enumerator;
+
+ Statement block = new CollectionForeachStatement (
+ var_type, variable, get_current, statement, loc);
+
+ loop = new While (move_next_expr, block, loc);
+
+ bool ok = true;
+
+ FlowBranchingException branching = null;
+ if (is_disposable)
+ branching = ec.StartFlowBranching (this);
+
+ if (!loop.Resolve (ec))
+ ok = false;
+
+ if (is_disposable) {
+ ResolveFinally (branching);
+ ec.EndFlowBranching ();
+ } else
+ emit_finally = true;
+
+ return ok;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ enumerator.Store (ec, init);
+
+ //
+ // Protect the code in a try/finalize block, so that
+ // if the beast implement IDisposable, we get rid of it
+ //
+ if (is_disposable && emit_finally)
+ ig.BeginExceptionBlock ();
+
+ loop.Emit (ec);
+
+ //
+ // Now the finally block
+ //
+ if (is_disposable) {
+ DoEmitFinally (ec);
+ if (emit_finally)
+ ig.EndExceptionBlock ();
+ }
+ }
+
+
+ public override void EmitFinally (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ if (enumerator_type.IsValueType) {
+ MethodInfo mi = FetchMethodDispose (enumerator_type);
+ if (mi != null) {
+ enumerator.EmitLoadAddress (ec);
+ ig.Emit (OpCodes.Call, mi);
+ } else {
+ enumerator.Emit (ec);
+ ig.Emit (OpCodes.Box, enumerator_type);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ }
+ } else {
+ Label call_dispose = ig.DefineLabel ();
+
+ enumerator.Emit (ec);
+ ig.Emit (OpCodes.Isinst, TypeManager.idisposable_type);
+ ig.Emit (OpCodes.Dup);
+ ig.Emit (OpCodes.Brtrue_S, call_dispose);
+ ig.Emit (OpCodes.Pop);
+
+ Label end_finally = ig.DefineLabel ();
+ ig.Emit (OpCodes.Br, end_finally);
+
+ ig.MarkLabel (call_dispose);
+ ig.Emit (OpCodes.Callvirt, TypeManager.void_dispose_void);
+ ig.MarkLabel (end_finally);
+ }
+ }
+ }
+
+ protected class CollectionForeachStatement : Statement
+ {
+ Type type;
+ Expression variable, current, conv;
+ Statement statement;
+ Assign assign;
+
+ public CollectionForeachStatement (Type type, Expression variable,
+ Expression current, Statement statement,
+ Location loc)
+ {
+ this.type = type;
+ this.variable = variable;
+ this.current = current;
+ this.statement = statement;
+ this.loc = loc;
+ }
+
+ public override bool Resolve (EmitContext ec)
+ {
+ current = current.Resolve (ec);
+ if (current == null)
+ return false;
+
+ conv = Convert.ExplicitConversion (ec, current, type, loc);
+ if (conv == null)
+ return false;
+
+ assign = new Assign (variable, conv, loc);
+ if (assign.Resolve (ec) == null)
+ return false;
+
+ if (!statement.Resolve (ec))
+ return false;
+
+ return true;
+ }
+
+ protected override void DoEmit (EmitContext ec)
+ {
+ assign.EmitStatement (ec);
+ statement.Emit (ec);
+ }
+ }
+ }
+}
projects / mono.git / commitdiff