//
// (C) 2001 Ximian, Inc.
//
+//
+
namespace CIR {
+ using System;
using System.Collections;
using System.Diagnostics;
- using System;
-
- public abstract class Expression {
- string type;
- bool is_lvalue;
+ using System.Reflection;
+ using System.Reflection.Emit;
+ using System.Text;
- public string Type {
- get {
- return type;
- }
- }
+ // <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 bool IsLValue {
- get {
- return is_lvalue;
- }
+ StaticCallExpr (MethodInfo m, ArrayList a)
+ {
+ mi = m;
+ args = a;
- set {
- is_lvalue = value;
- }
+ type = m.ReturnType;
+ eclass = ExprClass.Value;
}
- public virtual bool IsLiteral {
- get {
- return false;
- }
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // We are born fully resolved
+ //
+ return this;
}
-
- // <summary>
- // Protected constructor. Only derivate types should
- // be able to be created
- // </summary>
- // protected Type (
- protected Expression ()
+ public override void Emit (EmitContext ec)
{
- type = null;
+ if (args != null)
+ Invocation.EmitArguments (ec, mi, args);
+
+ ec.ig.Emit (OpCodes.Call, mi);
+ return;
}
- static bool EvaluateType (Expression expr, out string setType)
+ static public Expression MakeSimpleCall (EmitContext ec, MethodGroupExpr mg,
+ Expression e, Location loc)
{
- setType = null;
- return true;
+ ArrayList args;
+ MethodBase method;
+
+ args = new ArrayList (1);
+ args.Add (new Argument (e, Argument.AType.Expression));
+ method = Invocation.OverloadResolve (ec, (MethodGroupExpr) mg, args, loc);
+
+ if (method == null)
+ return null;
+
+ return new StaticCallExpr ((MethodInfo) method, args);
}
- }
+ public override void EmitStatement (EmitContext ec)
+ {
+ Emit (ec);
+ if (type != TypeManager.void_type)
+ ec.ig.Emit (OpCodes.Pop);
+ }
+ }
+
+ // <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 {
- Plus, Minus, Negate, BitComplement,
- Indirection, AddressOf, PreIncrement,
- PreDecrement, PostIncrement, PostDecrement
+ public enum Operator : byte {
+ UnaryPlus, UnaryNegation, LogicalNot, OnesComplement,
+ Indirection, AddressOf,
}
Operator oper;
Expression expr;
+ Location loc;
- public Unary (Operator op, Expression expr)
+ public Unary (Operator op, Expression expr, Location loc)
{
this.oper = op;
this.expr = expr;
+ this.loc = loc;
}
public Expression Expr {
oper = value;
}
}
+
+ // <summary>
+ // Returns a stringified representation of the Operator
+ // </summary>
+ string OperName ()
+ {
+ 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 ();
+ }
+
+ void error23 (Type t)
+ {
+ Report.Error (
+ 23, loc, "Operator " + OperName () +
+ " cannot be applied to operand of type `" +
+ TypeManager.CSharpName (t) + "'");
+ }
+
+ static Expression TryReduceNegative (Expression expr)
+ {
+ Expression e = null;
+
+ if (expr is IntLiteral)
+ e = new IntLiteral (-((IntLiteral) expr).Value);
+ else if (expr is UIntLiteral)
+ e = new LongLiteral (-((UIntLiteral) expr).Value);
+ else if (expr is LongLiteral)
+ e = new LongLiteral (-((LongLiteral) expr).Value);
+ else if (expr is FloatLiteral)
+ e = new FloatLiteral (-((FloatLiteral) expr).Value);
+ else if (expr is DoubleLiteral)
+ e = new DoubleLiteral (-((DoubleLiteral) expr).Value);
+ else if (expr is DecimalLiteral)
+ e = new DecimalLiteral (-((DecimalLiteral) expr).Value);
+
+ return e;
+ }
+
+ Expression ResolveOperator (EmitContext ec)
+ {
+ Type expr_type = expr.Type;
+
+ //
+ // Step 1: Perform Operator Overload location
+ //
+ Expression mg;
+ string op_name;
+
+ op_name = "op_" + oper;
+
+ mg = MemberLookup (ec, expr_type, op_name, false, loc);
+
+ if (mg == null && expr_type.BaseType != null)
+ mg = MemberLookup (ec, expr_type.BaseType, op_name, false, loc);
+
+ if (mg != null) {
+ Expression e = StaticCallExpr.MakeSimpleCall (
+ ec, (MethodGroupExpr) mg, expr, loc);
+
+ if (e == null){
+ error23 (expr_type);
+ return null;
+ }
+
+ return e;
+ }
+
+ //
+ // Step 2: Default operations on CLI native types.
+ //
+
+ // Only perform numeric promotions on:
+ // +, -
+
+ if (expr_type == null)
+ return null;
+
+ if (oper == Operator.LogicalNot){
+ if (expr_type != TypeManager.bool_type) {
+ error23 (expr.Type);
+ return null;
+ }
+
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ if (oper == 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)))){
+ error23 (expr.Type);
+ return null;
+ }
+ type = expr_type;
+ return this;
+ }
+
+ if (oper == Operator.UnaryPlus) {
+ //
+ // A plus in front of something is just a no-op, so return the child.
+ //
+ return expr;
+ }
+
+ //
+ // Deals with -literals
+ // int operator- (int x)
+ // long operator- (long x)
+ // float operator- (float f)
+ // double operator- (double d)
+ // decimal operator- (decimal d)
+ //
+ if (oper == Operator.UnaryNegation){
+ //
+ // Fold a "- Constant" into a negative constant
+ //
+
+ Expression e = null;
+
+ //
+ // Is this a constant?
+ //
+ e = TryReduceNegative (expr);
+
+ if (e != null){
+ e = e.Resolve (ec);
+ return e;
+ }
+
+ //
+ // Not a constant we can optimize, perform numeric
+ // promotions to int, long, double.
+ //
+ //
+ // The following is inneficient, because we call
+ // ConvertImplicit 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 written as a decimal interger literal
+ //
+ type = TypeManager.int64_type;
+ expr = ConvertImplicit (ec, expr, type, loc);
+ return this;
+ }
+
+ if (expr_type == TypeManager.uint64_type){
+ //
+ // FIXME: Handle exception of `long value'
+ // -92233720368547758087 (-2^63) to be written as
+ // decimal integer literal.
+ //
+ error23 (expr_type);
+ return null;
+ }
+
+ e = ConvertImplicit (ec, expr, TypeManager.int32_type, loc);
+ if (e != null){
+ expr = e;
+ type = e.Type;
+ return this;
+ }
+
+ e = ConvertImplicit (ec, expr, TypeManager.int64_type, loc);
+ if (e != null){
+ expr = e;
+ type = e.Type;
+ return this;
+ }
+
+ e = ConvertImplicit (ec, expr, TypeManager.double_type, loc);
+ if (e != null){
+ expr = e;
+ type = e.Type;
+ return this;
+ }
+
+ error23 (expr_type);
+ return null;
+ }
+
+ if (oper == Operator.AddressOf){
+ if (expr.ExprClass != ExprClass.Variable){
+ Error (211, loc, "Cannot take the address of non-variables");
+ return null;
+ }
+ type = Type.GetType (expr.Type.ToString () + "*");
+
+ return this;
+ }
+
+ Error (187, loc, "No such operator '" + OperName () + "' defined for type '" +
+ TypeManager.CSharpName (expr_type) + "'");
+ return null;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+
+ if (expr == null)
+ return null;
+
+ eclass = ExprClass.Value;
+ return ResolveOperator (ec);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ Type expr_type = expr.Type;
+
+ switch (oper) {
+ case Operator.UnaryPlus:
+ throw new Exception ("This should be caught by Resolve");
+
+ case Operator.UnaryNegation:
+ 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);
+ break;
+
+ case Operator.Indirection:
+ throw new Exception ("Not implemented yet");
+
+ default:
+ throw new Exception ("This should not happen: Operator = "
+ + oper.ToString ());
+ }
+ }
+
+ // <summary>
+ // This will emit the child expression for `ec' avoiding the logical
+ // not. The parent will take care of changing brfalse/brtrue
+ // </summary>
+ public void EmitLogicalNot (EmitContext ec)
+ {
+ if (oper != Operator.LogicalNot)
+ throw new Exception ("EmitLogicalNot can only be called with !expr");
+
+ expr.Emit (ec);
+ }
+
+ public override Expression Reduce (EmitContext ec)
+ {
+ Expression e;
+
+ //
+ // First, reduce our child. Note that although we handle
+ //
+ expr = expr.Reduce (ec);
+ if (!(expr is Literal))
+ return expr;
+
+ switch (oper){
+ case Operator.UnaryPlus:
+ return expr;
+
+ case Operator.UnaryNegation:
+ e = TryReduceNegative (expr);
+ if (e == null)
+ break;
+ return e;
+
+ case Operator.LogicalNot:
+ BoolLiteral b = (BoolLiteral) expr;
+
+ return new BoolLiteral (!(b.Value));
+
+ case Operator.OnesComplement:
+ Type et = expr.Type;
+
+ if (et == TypeManager.int32_type)
+ return new IntLiteral (~ ((IntLiteral) expr).Value);
+ if (et == TypeManager.uint32_type)
+ return new UIntLiteral (~ ((UIntLiteral) expr).Value);
+ if (et == TypeManager.int64_type)
+ return new LongLiteral (~ ((LongLiteral) expr).Value);
+ if (et == TypeManager.uint64_type)
+ return new ULongLiteral (~ ((ULongLiteral) expr).Value);
+ break;
+ }
+ return this;
+ }
}
- public class Probe : Expression {
- string type;
+ // <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.
+ // </remarks>
+ //
+ // 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)
+ //
+ // Maybe we should have classes PreIncrement, PostIncrement, PreDecrement,
+ // PostDecrement, that way we could save the `Mode' byte as well.
+ //
+ public class UnaryMutator : ExpressionStatement {
+ public enum Mode : byte {
+ PreIncrement, PreDecrement, PostIncrement, PostDecrement
+ }
+
+ Mode mode;
+ Location loc;
Expression expr;
- Operator oper;
+ LocalTemporary temp_storage;
- public enum Operator {
- Is, As
+ //
+ // This is expensive for the simplest case.
+ //
+ Expression method;
+
+ public UnaryMutator (Mode m, Expression e, Location l)
+ {
+ mode = m;
+ loc = l;
+ expr = e;
+ }
+
+ string OperName ()
+ {
+ return (mode == Mode.PreIncrement || mode == Mode.PostIncrement) ?
+ "++" : "--";
}
- public Probe (Operator oper, Expression expr, string type)
+ void error23 (Type t)
{
- this.oper = oper;
- this.type = type;
- this.expr = expr;
+ Report.Error (
+ 23, loc, "Operator " + OperName () +
+ " cannot be applied to operand of type `" +
+ TypeManager.CSharpName (t) + "'");
}
- public Operator Oper {
- get {
- return oper;
+ // <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);
+ }
+
+ 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, expr_type, op_name, false, loc);
+
+ if (mg == null && expr_type.BaseType != null)
+ mg = MemberLookup (ec, expr_type.BaseType, op_name, false, loc);
+
+ if (mg != null) {
+ method = StaticCallExpr.MakeSimpleCall (
+ ec, (MethodGroupExpr) mg, expr, loc);
+
+ type = method.Type;
+ return this;
+ }
+
+ //
+ // 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.ExprClass == ExprClass.Variable){
+ if (IsIncrementableNumber (expr_type) ||
+ expr_type == TypeManager.decimal_type){
+ return this;
+ }
+ } else if (expr.ExprClass == ExprClass.IndexerAccess){
+ IndexerAccess ia = (IndexerAccess) expr;
+
+ temp_storage = new LocalTemporary (ec, expr.Type);
+
+ expr = ia.ResolveLValue (ec, temp_storage);
+ if (expr == null)
+ return null;
+
+ return this;
+ } else if (expr.ExprClass == ExprClass.PropertyAccess){
+ PropertyExpr pe = (PropertyExpr) expr;
+
+ if (pe.VerifyAssignable ())
+ return this;
+
+ return null;
+ } else {
+ report118 (loc, expr, "variable, indexer or property access");
+ return null;
+ }
+
+ Error (187, loc, "No such operator '" + OperName () + "' defined for type '" +
+ TypeManager.CSharpName (expr_type) + "'");
+ return null;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+
+ if (expr == null)
+ return null;
+
+ eclass = ExprClass.Value;
+ return ResolveOperator (ec);
+ }
+
+
+ //
+ // FIXME: We need some way of avoiding the use of temp_storage
+ // for some types of storage (parameters, local variables,
+ // static fields) and single-dimension array access.
+ //
+ void EmitCode (EmitContext ec, bool is_expr)
+ {
+ ILGenerator ig = ec.ig;
+ IAssignMethod ia = (IAssignMethod) expr;
+
+ if (temp_storage == null)
+ temp_storage = new LocalTemporary (ec, expr.Type);
+
+ switch (mode){
+ case Mode.PreIncrement:
+ case Mode.PreDecrement:
+ if (method == null){
+ expr.Emit (ec);
+
+ ig.Emit (OpCodes.Ldc_I4_1);
+
+ if (mode == Mode.PreDecrement)
+ ig.Emit (OpCodes.Sub);
+ else
+ ig.Emit (OpCodes.Add);
+ } else
+ method.Emit (ec);
+
+ temp_storage.Store (ec);
+ ia.EmitAssign (ec, temp_storage);
+ if (is_expr)
+ temp_storage.Emit (ec);
+ break;
+
+ case Mode.PostIncrement:
+ case Mode.PostDecrement:
+ if (is_expr)
+ expr.Emit (ec);
+
+ if (method == null){
+ if (!is_expr)
+ expr.Emit (ec);
+ else
+ ig.Emit (OpCodes.Dup);
+
+ ig.Emit (OpCodes.Ldc_I4_1);
+
+ if (mode == Mode.PostDecrement)
+ ig.Emit (OpCodes.Sub);
+ else
+ ig.Emit (OpCodes.Add);
+ } else {
+ method.Emit (ec);
+ }
+
+ temp_storage.Store (ec);
+ ia.EmitAssign (ec, temp_storage);
+ break;
}
}
+ public override void Emit (EmitContext ec)
+ {
+ EmitCode (ec, true);
+
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ EmitCode (ec, false);
+ }
+
+ }
+
+ public class Probe : Expression {
+ public readonly string ProbeType;
+ public readonly Operator Oper;
+ Expression expr;
+ Type probe_type;
+
+ public enum Operator : byte {
+ Is, As
+ }
+
+ public Probe (Operator oper, Expression expr, string probe_type)
+ {
+ Oper = oper;
+ ProbeType = probe_type;
+ this.expr = expr;
+ }
+
public Expression Expr {
get {
return expr;
}
}
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ probe_type = ec.TypeContainer.LookupType (ProbeType, false);
- public string ProbeType {
- get {
- return type;
+ if (probe_type == null)
+ return null;
+
+ expr = expr.Resolve (ec);
+
+ type = TypeManager.bool_type;
+ eclass = ExprClass.Value;
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ expr.Emit (ec);
+
+ if (Oper == Operator.Is){
+ ig.Emit (OpCodes.Isinst, probe_type);
+ ig.Emit (OpCodes.Ldnull);
+ ig.Emit (OpCodes.Cgt_Un);
+ } else {
+ ig.Emit (OpCodes.Isinst, probe_type);
}
}
-
}
-
+
+ // <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 {
- string type;
+ string target_type;
Expression expr;
-
- public Cast (string type, Expression expr)
+ Location loc;
+
+ public Cast (string cast_type, Expression expr, Location loc)
{
- this.type = type;
+ this.target_type = cast_type;
this.expr = expr;
+ this.loc = loc;
}
public string TargetType {
get {
- return type;
+ return target_type;
}
}
expr = value;
}
}
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+ if (expr == null)
+ return null;
+
+ type = ec.TypeContainer.LookupType (target_type, false);
+ eclass = ExprClass.Value;
+
+ if (type == null)
+ return null;
+
+ expr = ConvertExplicit (ec, expr, type, loc);
+
+ return expr;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ //
+ // This one will never happen
+ //
+ throw new Exception ("Should not happen");
+ }
}
public class Binary : Expression {
- public enum Operator {
- Multiply, Divide, Modulo,
- Add, Substract,
- ShiftLeft, ShiftRight,
- LessThan, GreatherThan, LessOrEqual, GreatherOrEqual,
- Equal, NotEqual,
+ public enum Operator : byte {
+ Multiply, Division, Modulus,
+ Addition, Subtraction,
+ LeftShift, RightShift,
+ LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
+ Equality, Inequality,
BitwiseAnd,
ExclusiveOr,
BitwiseOr,
Operator oper;
Expression left, right;
+ MethodBase method;
+ ArrayList Arguments;
+ Location loc;
- public Binary (Operator oper, Expression left, Expression right)
+
+ public Binary (Operator oper, Expression left, Expression right, Location loc)
{
this.oper = oper;
this.left = left;
this.right = right;
+ this.loc = loc;
}
public Operator Oper {
right = value;
}
}
- }
- public class Conditional : Expression {
- Expression expr, trueExpr, falseExpr;
-
- public Conditional (Expression expr, Expression trueExpr, Expression falseExpr)
+
+ // <summary>
+ // Returns a stringified representation of the Operator
+ // </summary>
+ string OperName ()
{
- this.expr = expr;
- this.trueExpr = trueExpr;
- this.falseExpr = falseExpr;
+ 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 Expression Expr {
- get {
+ Expression ForceConversion (EmitContext ec, Expression expr, Type target_type)
+ {
+ if (expr.Type == target_type)
return expr;
+
+ return ConvertImplicit (ec, expr, target_type, new Location (-1));
+ }
+
+ //
+ // Note that handling the case l == Decimal || r == Decimal
+ // is taken care of by the Step 1 Operator Overload resolution.
+ //
+ bool DoNumericPromotions (EmitContext ec, Type l, Type r)
+ {
+ if (l == TypeManager.double_type || r == TypeManager.double_type){
+ //
+ // If either operand is of type double, the other operand is
+ // conveted to type double.
+ //
+ if (r != TypeManager.double_type)
+ right = ConvertImplicit (ec, right, TypeManager.double_type, loc);
+ if (l != TypeManager.double_type)
+ left = ConvertImplicit (ec, left, TypeManager.double_type, loc);
+
+ type = TypeManager.double_type;
+ } else if (l == TypeManager.float_type || r == TypeManager.float_type){
+ //
+ // if either operand is of type float, th eother operand is
+ // converd to type float.
+ //
+ if (r != TypeManager.double_type)
+ right = ConvertImplicit (ec, right, TypeManager.float_type, loc);
+ if (l != TypeManager.double_type)
+ left = ConvertImplicit (ec, left, TypeManager.float_type, loc);
+ type = TypeManager.float_type;
+ } else if (l == TypeManager.uint64_type || r == TypeManager.uint64_type){
+ Expression e;
+ Type other;
+ //
+ // If either operand is of type ulong, the other operand is
+ // converted to type ulong. or an error ocurrs if the other
+ // operand is of type sbyte, short, int or long
+ //
+
+ if (l == TypeManager.uint64_type){
+ if (r != TypeManager.uint64_type && right is IntLiteral){
+ e = TryImplicitIntConversion (l, (IntLiteral) right);
+ if (e != null)
+ right = e;
+ }
+ other = right.Type;
+ } else {
+ if (left is IntLiteral){
+ e = TryImplicitIntConversion (r, (IntLiteral) left);
+ if (e != null)
+ left = e;
+ }
+ other = left.Type;
+ }
+
+ if ((other == TypeManager.sbyte_type) ||
+ (other == TypeManager.short_type) ||
+ (other == TypeManager.int32_type) ||
+ (other == TypeManager.int64_type)){
+ string oper = OperName ();
+
+ Error (34, loc, "Operator `" + OperName ()
+ + "' is ambiguous on operands of type `"
+ + TypeManager.CSharpName (l) + "' "
+ + "and `" + TypeManager.CSharpName (r)
+ + "'");
+ }
+ type = TypeManager.uint64_type;
+ } else if (l == TypeManager.int64_type || r == TypeManager.int64_type){
+ //
+ // If either operand is of type long, the other operand is converted
+ // to type long.
+ //
+ if (l != TypeManager.int64_type)
+ left = ConvertImplicit (ec, left, TypeManager.int64_type, loc);
+ if (r != TypeManager.int64_type)
+ right = ConvertImplicit (ec, right, TypeManager.int64_type, loc);
+
+ type = TypeManager.int64_type;
+ } else if (l == TypeManager.uint32_type || r == TypeManager.uint32_type){
+ //
+ // If either operand is of type uint, and the other
+ // operand is of type sbyte, short or int, othe operands are
+ // converted to type long.
+ //
+ Type other = null;
+
+ if (l == TypeManager.uint32_type)
+ other = r;
+ else if (r == TypeManager.uint32_type)
+ other = l;
+
+ if ((other == TypeManager.sbyte_type) ||
+ (other == TypeManager.short_type) ||
+ (other == TypeManager.int32_type)){
+ left = ForceConversion (ec, left, TypeManager.int64_type);
+ right = ForceConversion (ec, right, TypeManager.int64_type);
+ type = TypeManager.int64_type;
+ } else {
+ //
+ // if either operand is of type uint, the other
+ // operand is converd to type uint
+ //
+ left = ForceConversion (ec, left, TypeManager.uint32_type);
+ right = ForceConversion (ec, right, TypeManager.uint32_type);
+ type = TypeManager.uint32_type;
+ }
+ } else if (l == TypeManager.decimal_type || r == TypeManager.decimal_type){
+ if (l != TypeManager.decimal_type)
+ left = ConvertImplicit (ec, left, TypeManager.decimal_type, loc);
+ if (r != TypeManager.decimal_type)
+ right = ConvertImplicit (ec, right, TypeManager.decimal_type, loc);
+
+ type = TypeManager.decimal_type;
+ } else {
+ Expression l_tmp, r_tmp;
+
+ l_tmp = ForceConversion (ec, left, TypeManager.int32_type);
+ if (l_tmp == null)
+ return false;
+
+ r_tmp = ForceConversion (ec, right, TypeManager.int32_type);
+ if (r_tmp == null)
+ return false;
+
+ left = l_tmp;
+ right = r_tmp;
+
+ type = TypeManager.int32_type;
}
+
+ return true;
}
- public Expression TrueExpr {
- get {
- return trueExpr;
- }
+ void error19 ()
+ {
+ Error (19, loc,
+ "Operator " + OperName () + " cannot be applied to operands of type `" +
+ TypeManager.CSharpName (left.Type) + "' and `" +
+ TypeManager.CSharpName (right.Type) + "'");
+
}
+
+ Expression CheckShiftArguments (EmitContext ec)
+ {
+ Expression e;
+ Type l = left.Type;
+ Type r = right.Type;
+
+ e = ForceConversion (ec, right, TypeManager.int32_type);
+ if (e == null){
+ error19 ();
+ return null;
+ }
+ right = e;
- public Expression FalseExpr {
- get {
- return falseExpr;
+ if (((e = ConvertImplicit (ec, left, TypeManager.int32_type, loc)) != null) ||
+ ((e = ConvertImplicit (ec, left, TypeManager.uint32_type, loc)) != null) ||
+ ((e = ConvertImplicit (ec, left, TypeManager.int64_type, loc)) != null) ||
+ ((e = ConvertImplicit (ec, left, TypeManager.uint64_type, loc)) != null)){
+ left = e;
+ type = e.Type;
+
+ return this;
}
+ error19 ();
+ return null;
}
- }
-
- public class SimpleName : Expression {
- string name;
- public SimpleName (string name)
+ Expression ResolveOperator (EmitContext ec)
{
- this.name = name;
- }
+ Type l = left.Type;
+ Type r = right.Type;
+
+ //
+ // Step 1: Perform Operator Overload location
+ //
+ Expression left_expr, right_expr;
+
+ string op = "op_" + oper;
+
+ left_expr = MemberLookup (ec, l, op, false, loc);
+ if (left_expr == null && l.BaseType != null)
+ left_expr = MemberLookup (ec, l.BaseType, op, false, loc);
+
+ right_expr = MemberLookup (ec, r, op, false, loc);
+ if (right_expr == null && r.BaseType != null)
+ right_expr = MemberLookup (ec, r.BaseType, op, false, loc);
+
+ MethodGroupExpr union = Invocation.MakeUnionSet (left_expr, right_expr);
+
+ if (union != null) {
+ Arguments = new ArrayList ();
+ Arguments.Add (new Argument (left, Argument.AType.Expression));
+ Arguments.Add (new Argument (right, Argument.AType.Expression));
+
+ method = Invocation.OverloadResolve (ec, union, Arguments, loc);
+ if (method != null) {
+ MethodInfo mi = (MethodInfo) method;
+ type = mi.ReturnType;
+ return this;
+ } else {
+ error19 ();
+ return null;
+ }
+ }
+
+ //
+ // Step 2: Default operations on CLI native types.
+ //
+
+ // Only perform numeric promotions on:
+ // +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
+ //
+ if (oper == Operator.Addition){
+ //
+ // If any of the arguments is a string, cast to string
+ //
+ if (l == TypeManager.string_type){
+ if (r == TypeManager.string_type){
+ if (left is Literal && right is Literal){
+ StringLiteral ls = (StringLiteral) left;
+ StringLiteral rs = (StringLiteral) right;
+
+ return new StringLiteral (ls.Value + rs.Value);
+ }
+
+ // string + string
+ method = TypeManager.string_concat_string_string;
+ } else {
+ // string + object
+ method = TypeManager.string_concat_object_object;
+ right = ConvertImplicit (ec, right,
+ TypeManager.object_type, loc);
+ }
+ type = TypeManager.string_type;
+
+ Arguments = new ArrayList ();
+ Arguments.Add (new Argument (left, Argument.AType.Expression));
+ Arguments.Add (new Argument (right, Argument.AType.Expression));
+
+ return this;
+
+ } else if (r == TypeManager.string_type){
+ // object + string
+ method = TypeManager.string_concat_object_object;
+ Arguments = new ArrayList ();
+ Arguments.Add (new Argument (left, Argument.AType.Expression));
+ Arguments.Add (new Argument (right, Argument.AType.Expression));
+
+ left = ConvertImplicit (ec, left, TypeManager.object_type, loc);
+ type = TypeManager.string_type;
+
+ return this;
+ }
+
+ //
+ // FIXME: is Delegate operator + (D x, D y) handled?
+ //
+ }
+
+ 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){
+ error19 ();
+ return null;
+ }
+
+ type = TypeManager.bool_type;
+ return this;
+ }
+
+ 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){
+ error19 ();
+ return null;
+ }
+
+ type = TypeManager.bool_type;
+ return this;
+ }
- public string Name {
- get {
- return name;
}
+
+ //
+ // We are dealing with numbers
+ //
+
+ if (!DoNumericPromotions (ec, l, r)){
+ // Attempt:
+ //
+ // operator != (object a, object b)
+ // operator == (object a, object b)
+ //
+
+ if (oper == Operator.Equality || oper == Operator.Inequality){
+ Expression li, ri;
+ li = ConvertImplicit (ec, left, TypeManager.object_type, loc);
+ if (li != null){
+ ri = ConvertImplicit (ec, right, TypeManager.object_type,
+ loc);
+ if (ri != null){
+ left = li;
+ right = ri;
+
+ type = TypeManager.bool_type;
+ return this;
+ }
+ }
+ }
+
+ error19 ();
+ return null;
+ }
+
+ if (left == null || right == null)
+ return null;
+
+
+ if (oper == Operator.BitwiseAnd ||
+ oper == Operator.BitwiseOr ||
+ oper == Operator.ExclusiveOr){
+ if (!((l == TypeManager.int32_type) ||
+ (l == TypeManager.uint32_type) ||
+ (l == TypeManager.int64_type) ||
+ (l == TypeManager.uint64_type))){
+ error19 ();
+ return null;
+ }
+ type = l;
+ }
+
+ if (oper == Operator.Equality ||
+ oper == Operator.Inequality ||
+ oper == Operator.LessThanOrEqual ||
+ oper == Operator.LessThan ||
+ oper == Operator.GreaterThanOrEqual ||
+ oper == Operator.GreaterThan){
+ type = TypeManager.bool_type;
+ }
+
+ return this;
}
- }
-
- public class LocalVariableReference : Expression {
- string name;
- Block block;
- public LocalVariableReference (Block block, string name)
+ public override Expression DoResolve (EmitContext ec)
{
- this.block = block;
- this.name = name;
+ left = left.Resolve (ec);
+ right = right.Resolve (ec);
+
+ if (left == null || right == null)
+ return null;
+
+ if (left.Type == null)
+ throw new Exception (
+ "Resolve returned non null, but did not set the type! (" +
+ left + ") at Line: " + loc.Row);
+ if (right.Type == null)
+ throw new Exception (
+ "Resolve returned non null, but did not set the type! (" +
+ right + ") at Line: "+ loc.Row);
+
+ eclass = ExprClass.Value;
+
+ return ResolveOperator (ec);
}
- public Block Block {
- get {
- return block;
- }
+ public bool IsBranchable ()
+ {
+ if (oper == Operator.Equality ||
+ oper == Operator.Inequality ||
+ oper == Operator.LessThan ||
+ oper == Operator.GreaterThan ||
+ oper == Operator.LessThanOrEqual ||
+ oper == Operator.GreaterThanOrEqual){
+ return true;
+ } else
+ return false;
}
- public string Name {
- get {
- return name;
+ // <summary>
+ // This entry point is used by routines that might want
+ // to emit a brfalse/brtrue after an expression, and instead
+ // they could use a more compact notation.
+ //
+ // Typically the code would generate l.emit/r.emit, followed
+ // by the comparission and then a brtrue/brfalse. The comparissions
+ // are sometimes inneficient (there are not as complete as the branches
+ // look for the hacks in Emit using double ceqs).
+ //
+ // So for those cases we provide EmitBranchable that can emit the
+ // branch with the test
+ // </summary>
+ public void EmitBranchable (EmitContext ec, int target)
+ {
+ OpCode opcode;
+ bool close_target = false;
+
+ left.Emit (ec);
+ right.Emit (ec);
+
+ switch (oper){
+ case Operator.Equality:
+ if (close_target)
+ opcode = OpCodes.Beq_S;
+ else
+ opcode = OpCodes.Beq;
+ break;
+
+ case Operator.Inequality:
+ if (close_target)
+ opcode = OpCodes.Bne_Un_S;
+ else
+ opcode = OpCodes.Bne_Un;
+ break;
+
+ case Operator.LessThan:
+ if (close_target)
+ opcode = OpCodes.Blt_S;
+ else
+ opcode = OpCodes.Blt;
+ break;
+
+ case Operator.GreaterThan:
+ if (close_target)
+ opcode = OpCodes.Bgt_S;
+ else
+ opcode = OpCodes.Bgt;
+ break;
+
+ case Operator.LessThanOrEqual:
+ if (close_target)
+ opcode = OpCodes.Ble_S;
+ else
+ opcode = OpCodes.Ble;
+ break;
+
+ case Operator.GreaterThanOrEqual:
+ if (close_target)
+ opcode = OpCodes.Bge_S;
+ else
+ opcode = OpCodes.Ble;
+ break;
+
+ default:
+ throw new Exception ("EmitBranchable called on non-EmitBranchable operator: "
+ + oper.ToString ());
}
- }
- }
- public class ParameterReference : Expression {
- Parameters pars;
- string name;
+ ec.ig.Emit (opcode, target);
+ }
- public ParameterReference (Parameters pars, string name)
+ public override void Emit (EmitContext ec)
{
- this.pars = pars;
- this.name = name;
+ ILGenerator ig = ec.ig;
+ Type l = left.Type;
+ Type r = right.Type;
+ OpCode opcode;
+
+ if (method != null) {
+
+ // Note that operators are static anyway
+
+ if (Arguments != null)
+ Invocation.EmitArguments (ec, method, Arguments);
+
+ if (method is MethodInfo)
+ ig.Emit (OpCodes.Call, (MethodInfo) method);
+ else
+ ig.Emit (OpCodes.Call, (ConstructorInfo) method);
+
+ return;
+ }
+
+ left.Emit (ec);
+ right.Emit (ec);
+
+ switch (oper){
+ case Operator.Multiply:
+ if (ec.CheckState){
+ if (l == TypeManager.int32_type || l == TypeManager.int64_type)
+ opcode = OpCodes.Mul_Ovf;
+ else if (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
+ opcode = OpCodes.Mul_Ovf_Un;
+ else
+ opcode = OpCodes.Mul;
+ } else
+ opcode = OpCodes.Mul;
+
+ break;
+
+ case Operator.Division:
+ if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
+ opcode = OpCodes.Div_Un;
+ else
+ opcode = OpCodes.Div;
+ break;
+
+ case Operator.Modulus:
+ if (l == TypeManager.uint32_type || l == TypeManager.uint64_type)
+ 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 (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
+ opcode = OpCodes.Add_Ovf_Un;
+ else
+ opcode = OpCodes.Mul;
+ } 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 (l==TypeManager.uint32_type || l==TypeManager.uint64_type)
+ opcode = OpCodes.Sub_Ovf_Un;
+ else
+ opcode = OpCodes.Sub;
+ } else
+ opcode = OpCodes.Sub;
+ break;
+
+ case Operator.RightShift:
+ opcode = OpCodes.Shr;
+ break;
+
+ case Operator.LeftShift:
+ opcode = OpCodes.Shl;
+ break;
+
+ case Operator.Equality:
+ opcode = OpCodes.Ceq;
+ break;
+
+ case Operator.Inequality:
+ ec.ig.Emit (OpCodes.Ceq);
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
+
+ opcode = OpCodes.Ceq;
+ break;
+
+ case Operator.LessThan:
+ opcode = OpCodes.Clt;
+ break;
+
+ case Operator.GreaterThan:
+ opcode = OpCodes.Cgt;
+ break;
+
+ case Operator.LessThanOrEqual:
+ ec.ig.Emit (OpCodes.Cgt);
+ ec.ig.Emit (OpCodes.Ldc_I4_0);
+
+ opcode = OpCodes.Ceq;
+ break;
+
+ case Operator.GreaterThanOrEqual:
+ ec.ig.Emit (OpCodes.Clt);
+ ec.ig.Emit (OpCodes.Ldc_I4_1);
+
+ opcode = OpCodes.Sub;
+ break;
+
+ case Operator.LogicalOr:
+ case Operator.BitwiseOr:
+ opcode = OpCodes.Or;
+ break;
+
+ case Operator.LogicalAnd:
+ 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);
}
- public string Name {
- get {
- return name;
+ // <summary>
+ // Constant expression reducer for binary operations
+ // </summary>
+ public override Expression Reduce (EmitContext ec)
+ {
+
+ left = left.Reduce (ec);
+ right = right.Reduce (ec);
+
+ if (!(left is Literal && right is Literal))
+ return this;
+
+ if (method == TypeManager.string_concat_string_string){
+ StringLiteral ls = (StringLiteral) left;
+ StringLiteral rs = (StringLiteral) right;
+
+ return new StringLiteral (ls.Value + rs.Value);
}
+
+ // FINISH ME.
+
+ return this;
}
}
-
- // <summary>
- // Used for arguments to New(), Invocation()
- // </summary>
- public class Argument {
- public enum AType {
- Expression,
- Ref,
- Out
- };
-
- AType type;
- Expression expr;
- public Argument (Expression expr, AType type)
+ public class Conditional : Expression {
+ Expression expr, trueExpr, falseExpr;
+ Location loc;
+
+ public Conditional (Expression expr, Expression trueExpr, Expression falseExpr, Location l)
{
this.expr = expr;
- this.type = type;
+ this.trueExpr = trueExpr;
+ this.falseExpr = falseExpr;
+ this.loc = l;
}
public Expression Expr {
}
}
- public AType Type {
+ public Expression TrueExpr {
get {
- return type;
+ return trueExpr;
}
}
- }
- // <summary>
- // Invocation of methods or delegates.
- // </summary>
- public class Invocation : Expression {
- ArrayList arguments;
+ public Expression FalseExpr {
+ get {
+ return falseExpr;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ expr = expr.Resolve (ec);
+
+ if (expr.Type != TypeManager.bool_type)
+ expr = Expression.ConvertImplicitRequired (
+ ec, expr, TypeManager.bool_type, loc);
+
+ trueExpr = trueExpr.Resolve (ec);
+ falseExpr = falseExpr.Resolve (ec);
+
+ if (expr == null || trueExpr == null || falseExpr == null)
+ return null;
+
+ if (trueExpr.Type == falseExpr.Type)
+ type = trueExpr.Type;
+ else {
+ Expression conv;
+
+ //
+ // First, if an implicit conversion exists from trueExpr
+ // to falseExpr, then the result type is of type falseExpr.Type
+ //
+ conv = ConvertImplicit (ec, trueExpr, falseExpr.Type, loc);
+ if (conv != null){
+ type = falseExpr.Type;
+ trueExpr = conv;
+ } else if ((conv = ConvertImplicit(ec, falseExpr,trueExpr.Type,loc))!= null){
+ type = trueExpr.Type;
+ falseExpr = conv;
+ } else {
+ Error (173, loc, "The type of the conditional expression can " +
+ "not be computed because there is no implicit conversion" +
+ " from `" + TypeManager.CSharpName (trueExpr.Type) + "'" +
+ " and `" + TypeManager.CSharpName (falseExpr.Type) + "'");
+ return null;
+ }
+ }
+
+ if (expr is BoolLiteral){
+ BoolLiteral bl = (BoolLiteral) expr;
+
+ if (bl.Value)
+ return trueExpr;
+ else
+ return falseExpr;
+ }
+
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+ Label false_target = ig.DefineLabel ();
+ Label end_target = ig.DefineLabel ();
+
+ expr.Emit (ec);
+ ig.Emit (OpCodes.Brfalse, false_target);
+ trueExpr.Emit (ec);
+ ig.Emit (OpCodes.Br, end_target);
+ ig.MarkLabel (false_target);
+ falseExpr.Emit (ec);
+ ig.MarkLabel (end_target);
+ }
+
+ public override Expression Reduce (EmitContext ec)
+ {
+ expr = expr.Reduce (ec);
+ trueExpr = trueExpr.Reduce (ec);
+ falseExpr = falseExpr.Reduce (ec);
+
+ if (!(expr is Literal && trueExpr is Literal && falseExpr is Literal))
+ return this;
+
+ BoolLiteral bl = (BoolLiteral) expr;
+
+ if (bl.Value)
+ return trueExpr;
+ else
+ return falseExpr;
+ }
+ }
+
+ public class LocalVariableReference : Expression, IAssignMethod, IMemoryLocation {
+ public readonly string Name;
+ public readonly Block Block;
+
+ VariableInfo variable_info;
+
+ public LocalVariableReference (Block block, string name)
+ {
+ Block = block;
+ Name = name;
+ eclass = ExprClass.Variable;
+ }
+
+ public VariableInfo VariableInfo {
+ get {
+ if (variable_info == null)
+ variable_info = Block.GetVariableInfo (Name);
+ return variable_info;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ VariableInfo vi = VariableInfo;
+
+ type = vi.VariableType;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ VariableInfo vi = VariableInfo;
+ ILGenerator ig = ec.ig;
+ int idx = vi.Idx;
+
+ vi.Used = true;
+
+ switch (idx){
+ case 0:
+ ig.Emit (OpCodes.Ldloc_0);
+ break;
+
+ case 1:
+ ig.Emit (OpCodes.Ldloc_1);
+ break;
+
+ case 2:
+ ig.Emit (OpCodes.Ldloc_2);
+ break;
+
+ case 3:
+ ig.Emit (OpCodes.Ldloc_3);
+ break;
+
+ default:
+ if (idx <= 255)
+ ig.Emit (OpCodes.Ldloc_S, (byte) idx);
+ else
+ ig.Emit (OpCodes.Ldloc, idx);
+ break;
+ }
+ }
+
+ public static void Store (ILGenerator ig, int idx)
+ {
+ switch (idx){
+ case 0:
+ ig.Emit (OpCodes.Stloc_0);
+ break;
+
+ case 1:
+ ig.Emit (OpCodes.Stloc_1);
+ break;
+
+ case 2:
+ ig.Emit (OpCodes.Stloc_2);
+ break;
+
+ case 3:
+ ig.Emit (OpCodes.Stloc_3);
+ break;
+
+ default:
+ if (idx <= 255)
+ ig.Emit (OpCodes.Stloc_S, (byte) idx);
+ else
+ ig.Emit (OpCodes.Stloc, idx);
+ break;
+ }
+ }
+
+ public void EmitAssign (EmitContext ec, Expression source)
+ {
+ ILGenerator ig = ec.ig;
+ VariableInfo vi = VariableInfo;
+
+ vi.Assigned = true;
+
+ source.Emit (ec);
+
+ // Funny seems the code below generates optimal code for us, but
+ // seems to take too long to generate what we need.
+ // ig.Emit (OpCodes.Stloc, vi.LocalBuilder);
+
+ Store (ig, vi.Idx);
+ }
+
+ public void AddressOf (EmitContext ec)
+ {
+ VariableInfo vi = VariableInfo;
+ int idx = vi.Idx;
+
+ vi.Used = true;
+ vi.Assigned = true;
+
+ if (idx <= 255)
+ ec.ig.Emit (OpCodes.Ldloca_S, (byte) idx);
+ else
+ ec.ig.Emit (OpCodes.Ldloca, idx);
+ }
+ }
+
+ public class ParameterReference : Expression, IAssignMethod, IMemoryLocation {
+ public readonly Parameters Pars;
+ public readonly String Name;
+ public readonly int Idx;
+ int arg_idx;
+
+ public ParameterReference (Parameters pars, int idx, string name)
+ {
+ Pars = pars;
+ Idx = idx;
+ Name = name;
+ eclass = ExprClass.Variable;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ Type [] types = Pars.GetParameterInfo (ec.TypeContainer);
+
+ type = types [Idx];
+
+ arg_idx = Idx;
+ if (!ec.IsStatic)
+ arg_idx++;
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ if (arg_idx <= 255)
+ ec.ig.Emit (OpCodes.Ldarg_S, (byte) arg_idx);
+ else
+ ec.ig.Emit (OpCodes.Ldarg, arg_idx);
+ }
+
+ public void EmitAssign (EmitContext ec, Expression source)
+ {
+ source.Emit (ec);
+
+ if (arg_idx <= 255)
+ ec.ig.Emit (OpCodes.Starg_S, (byte) arg_idx);
+ else
+ ec.ig.Emit (OpCodes.Starg, arg_idx);
+
+ }
+
+ public void AddressOf (EmitContext ec)
+ {
+ if (arg_idx <= 255)
+ ec.ig.Emit (OpCodes.Ldarga_S, (byte) arg_idx);
+ else
+ ec.ig.Emit (OpCodes.Ldarga, arg_idx);
+ }
+ }
+
+ // <summary>
+ // Used for arguments to New(), Invocation()
+ // </summary>
+ public class Argument {
+ public enum AType : byte {
+ Expression,
+ Ref,
+ Out
+ };
+
+ public readonly AType ArgType;
+ public Expression expr;
+
+ public Argument (Expression expr, AType type)
+ {
+ this.expr = expr;
+ this.ArgType = type;
+ }
+
+ public Expression Expr {
+ get {
+ return expr;
+ }
+
+ set {
+ expr = value;
+ }
+ }
+
+ public Type Type {
+ get {
+ return expr.Type;
+ }
+ }
+
+ public Parameter.Modifier GetParameterModifier ()
+ {
+ if (ArgType == AType.Ref)
+ return Parameter.Modifier.REF;
+
+ if (ArgType == AType.Out)
+ return Parameter.Modifier.OUT;
+
+ return Parameter.Modifier.NONE;
+ }
+
+ public static string FullDesc (Argument a)
+ {
+ return (a.ArgType == AType.Ref ? "ref " :
+ (a.ArgType == AType.Out ? "out " : "")) +
+ TypeManager.CSharpName (a.Expr.Type);
+ }
+
+ public bool Resolve (EmitContext ec, Location loc)
+ {
+ expr = expr.Resolve (ec);
+
+ if (ArgType == AType.Expression)
+ return expr != null;
+
+ if (expr.ExprClass != ExprClass.Variable){
+ Report.Error (206, loc,
+ "A property or indexer can not be passed as an out or ref " +
+ "parameter");
+ return false;
+ }
+
+ return expr != null;
+ }
+
+ public void Emit (EmitContext ec)
+ {
+ if (ArgType == AType.Ref || ArgType == AType.Out)
+ ((IMemoryLocation)expr).AddressOf (ec);
+ else
+ expr.Emit (ec);
+ }
+ }
+
+ // <summary>
+ // Invocation of methods or delegates.
+ // </summary>
+ public class Invocation : ExpressionStatement {
+ public readonly ArrayList Arguments;
+ Location loc;
+
Expression expr;
+ MethodBase method = null;
+
+ static Hashtable method_parameter_cache;
+
+ static Invocation ()
+ {
+ method_parameter_cache = new Hashtable ();
+ }
+
+ //
+ // 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, Location l)
+ {
+ this.expr = expr;
+ Arguments = arguments;
+ loc = l;
+ }
+
+ public Expression Expr {
+ get {
+ return expr;
+ }
+ }
+
+ // <summary>
+ // Returns the Parameters (a ParameterData interface) for the
+ // Method `mb'
+ // </summary>
+ public static ParameterData GetParameterData (MethodBase mb)
+ {
+ object pd = method_parameter_cache [mb];
+ object ip;
+
+ if (pd != null)
+ return (ParameterData) pd;
+
+
+ ip = TypeContainer.LookupParametersByBuilder (mb);
+ if (ip != null){
+ method_parameter_cache [mb] = ip;
+
+ return (ParameterData) ip;
+ } else {
+ ParameterInfo [] pi = mb.GetParameters ();
+ ReflectionParameters rp = new ReflectionParameters (pi);
+ method_parameter_cache [mb] = rp;
+
+ return (ParameterData) rp;
+ }
+ }
+
+ // <summary>
+ // Tells whether a user defined conversion from Type `from' to
+ // Type `to' exists.
+ //
+ // FIXME: we could implement a cache here.
+ // </summary>
+ static bool ConversionExists (EmitContext ec, Type from, Type to, Location loc)
+ {
+ // Locate user-defined implicit operators
+
+ Expression mg;
+
+ mg = MemberLookup (ec, to, "op_Implicit", false, loc);
+
+ if (mg != null) {
+ MethodGroupExpr me = (MethodGroupExpr) mg;
+
+ for (int i = me.Methods.Length; i > 0;) {
+ i--;
+ MethodBase mb = me.Methods [i];
+ ParameterData pd = GetParameterData (mb);
+
+ if (from == pd.ParameterType (0))
+ return true;
+ }
+ }
+
+ mg = MemberLookup (ec, from, "op_Implicit", false, loc);
+
+ if (mg != null) {
+ MethodGroupExpr me = (MethodGroupExpr) mg;
+
+ for (int i = me.Methods.Length; i > 0;) {
+ i--;
+ MethodBase mb = me.Methods [i];
+ MethodInfo mi = (MethodInfo) mb;
+
+ if (mi.ReturnType == to)
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ // <summary>
+ // Determines "better conversion" as specified in 7.4.2.3
+ // Returns : 1 if a->p is better
+ // 0 if a->q or neither is better
+ // </summary>
+ static int BetterConversion (EmitContext ec, Argument a, Type p, Type q, bool use_standard,
+ Location loc)
+ {
+ Type argument_type = 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 == q)
+ return 0;
+
+ if (argument_type == p)
+ return 1;
+
+ if (argument_type == q)
+ return 0;
+
+ //
+ // Now probe whether an implicit constant expression conversion
+ // can be used.
+ //
+ // An implicit constant expression conversion permits the following
+ // conversions:
+ //
+ // * A constant-expression of type `int' can be converted to type
+ // sbyte, byute, short, ushort, uint, ulong provided the value of
+ // of the expression is withing the range of the destination type.
+ //
+ // * A constant-expression of type long can be converted to type
+ // ulong, provided the value of the constant expression is not negative
+ //
+ // FIXME: Note that this assumes that constant folding has
+ // taken place. We dont do constant folding yet.
+ //
+
+ if (argument_expr is IntLiteral){
+ IntLiteral ei = (IntLiteral) argument_expr;
+ int value = ei.Value;
+
+ if (p == TypeManager.sbyte_type){
+ if (value >= SByte.MinValue && value <= SByte.MaxValue)
+ return 1;
+ } else if (p == TypeManager.byte_type){
+ if (Byte.MinValue >= 0 && value <= Byte.MaxValue)
+ return 1;
+ } else if (p == TypeManager.short_type){
+ if (value >= Int16.MinValue && value <= Int16.MaxValue)
+ return 1;
+ } else if (p == TypeManager.ushort_type){
+ if (value >= UInt16.MinValue && value <= UInt16.MaxValue)
+ return 1;
+ } else if (p == TypeManager.uint32_type){
+ //
+ // we can optimize this case: a positive int32
+ // always fits on a uint32
+ //
+ if (value >= 0)
+ return 1;
+ } else if (p == TypeManager.uint64_type){
+ //
+ // we can optimize this case: a positive int32
+ // always fits on a uint64
+ //
+ if (value >= 0)
+ return 1;
+ }
+ } else if (argument_type == TypeManager.int64_type && argument_expr is LongLiteral){
+ LongLiteral ll = (LongLiteral) argument_expr;
+
+ if (p == TypeManager.uint64_type){
+ if (ll.Value > 0)
+ return 1;
+ }
+ }
+
+ if (q == null) {
+
+ Expression tmp;
+
+ if (use_standard)
+ tmp = ConvertImplicitStandard (ec, argument_expr, p, loc);
+ else
+ tmp = ConvertImplicit (ec, argument_expr, p, loc);
+
+ if (tmp != null)
+ return 1;
+ else
+ return 0;
+
+ }
+
+ if (ConversionExists (ec, p, q, loc) == true &&
+ ConversionExists (ec, q, p, loc) == false)
+ return 1;
+
+ if (p == TypeManager.sbyte_type)
+ if (q == TypeManager.byte_type || q == TypeManager.ushort_type ||
+ q == TypeManager.uint32_type || q == TypeManager.uint64_type)
+ return 1;
+
+ if (p == TypeManager.short_type)
+ if (q == TypeManager.ushort_type || q == TypeManager.uint32_type ||
+ q == TypeManager.uint64_type)
+ return 1;
+
+ if (p == TypeManager.int32_type)
+ if (q == TypeManager.uint32_type || q == TypeManager.uint64_type)
+ return 1;
+
+ if (p == TypeManager.int64_type)
+ if (q == TypeManager.uint64_type)
+ return 1;
+
+ return 0;
+ }
+
+ // <summary>
+ // Determines "Better function" and returns an integer indicating :
+ // 0 if candidate ain't better
+ // 1 if candidate is better than the current best match
+ // </summary>
+ static int BetterFunction (EmitContext ec, ArrayList args,
+ MethodBase candidate, MethodBase best,
+ bool use_standard, Location loc)
+ {
+ ParameterData candidate_pd = GetParameterData (candidate);
+ ParameterData best_pd;
+ int argument_count;
+
+ if (args == null)
+ argument_count = 0;
+ else
+ argument_count = args.Count;
+
+ if (candidate_pd.Count == 0 && argument_count == 0)
+ return 1;
+
+ if (best == null) {
+ if (candidate_pd.Count == argument_count) {
+ int x = 0;
+ for (int j = argument_count; j > 0;) {
+ j--;
+
+ Argument a = (Argument) args [j];
+
+ x = BetterConversion (
+ ec, a, candidate_pd.ParameterType (j), null,
+ use_standard, loc);
+
+ if (x <= 0)
+ break;
+ }
+
+ if (x > 0)
+ return 1;
+ else
+ return 0;
+
+ } else
+ return 0;
+ }
+
+ best_pd = GetParameterData (best);
+
+ if (candidate_pd.Count == argument_count && best_pd.Count == argument_count) {
+ int rating1 = 0, rating2 = 0;
+
+ for (int j = argument_count; j > 0;) {
+ j--;
+ int x, y;
+
+ Argument a = (Argument) args [j];
+
+ x = BetterConversion (ec, a, candidate_pd.ParameterType (j),
+ best_pd.ParameterType (j), use_standard, loc);
+ y = BetterConversion (ec, a, best_pd.ParameterType (j),
+ candidate_pd.ParameterType (j), use_standard,
+ loc);
+
+ rating1 += x;
+ rating2 += y;
+ }
+
+ if (rating1 > rating2)
+ return 1;
+ else
+ return 0;
+ } else
+ return 0;
+
+ }
+
+ public static string FullMethodDesc (MethodBase mb)
+ {
+ StringBuilder sb = new StringBuilder (mb.Name);
+ ParameterData pd = GetParameterData (mb);
+
+ int count = pd.Count;
+ sb.Append (" (");
+
+ for (int i = count; i > 0; ) {
+ i--;
+
+ sb.Append (pd.ParameterDesc (count - i - 1));
+ if (i != 0)
+ sb.Append (", ");
+ }
+
+ sb.Append (")");
+ return sb.ToString ();
+ }
+
+ public static MethodGroupExpr MakeUnionSet (Expression mg1, Expression mg2)
+ {
+ MemberInfo [] miset;
+ MethodGroupExpr union;
+
+ if (mg1 != null && mg2 != null) {
+
+ 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 ();
+
+ for (int i = 0; i < left_set.Methods.Length; i++) {
+ for (int j = 0; j < right_set.Methods.Length; j++) {
+ if (left_set.Methods [i] == right_set.Methods [j])
+ common.Add (left_set.Methods [i]);
+ }
+ }
+
+ miset = new MemberInfo [length1 + length2 - common.Count];
+
+ left_set.Methods.CopyTo (miset, 0);
+
+ int k = 0;
+
+ for (int j = 0; j < right_set.Methods.Length; j++)
+ if (!common.Contains (right_set.Methods [j]))
+ miset [length1 + k++] = right_set.Methods [j];
+
+ union = new MethodGroupExpr (miset);
+
+ return union;
+
+ } else if (mg1 == null && mg2 != null) {
+
+ MethodGroupExpr me = (MethodGroupExpr) mg2;
+
+ miset = new MemberInfo [me.Methods.Length];
+ me.Methods.CopyTo (miset, 0);
+
+ union = new MethodGroupExpr (miset);
+
+ return union;
+
+ } else if (mg2 == null && mg1 != null) {
+
+ MethodGroupExpr me = (MethodGroupExpr) mg1;
+
+ miset = new MemberInfo [me.Methods.Length];
+ me.Methods.CopyTo (miset, 0);
+
+ union = new MethodGroupExpr (miset);
+
+ return union;
+ }
+
+ return null;
+ }
+
+ // <summary>
+ // Determines is the candidate method, if a params method, is applicable
+ // in its expanded form to the given set of arguments
+ // </summary>
+ static bool IsParamsMethodApplicable (ArrayList arguments, MethodBase candidate)
+ {
+ int arg_count;
+
+ if (arguments == null)
+ arg_count = 0;
+ else
+ arg_count = arguments.Count;
+
+ ParameterData pd = GetParameterData (candidate);
+
+ int pd_count = pd.Count;
+
+ if (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS)
+ return false;
+
+ if (pd_count - 1 > arg_count)
+ return false;
+
+ // 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. So, we now check if the element type
+ // of the params array is compatible with each argument type
+ //
+
+ Type element_type = pd.ParameterType (pd_count - 1).GetElementType ();
+
+ for (int i = pd_count - 1; i < arg_count - 1; i++) {
+ Argument a = (Argument) arguments [i];
+ if (!StandardConversionExists (a.Type, element_type))
+ return false;
+ }
+
+ return true;
+ }
+
+ // <summary>
+ // Determines if the candidate method is applicable (section 14.4.2.1)
+ // to the given set of arguments
+ // </summary>
+ static bool IsApplicable (ArrayList arguments, MethodBase candidate)
+ {
+ int arg_count;
+
+ if (arguments == null)
+ arg_count = 0;
+ else
+ arg_count = arguments.Count;
+
+ ParameterData pd = GetParameterData (candidate);
+
+ int pd_count = pd.Count;
+
+ 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.GetParameterModifier ();
+ Parameter.Modifier p_mod = pd.ParameterModifier (i);
+
+ if (a_mod == p_mod) {
+
+ if (a_mod == Parameter.Modifier.NONE)
+ if (!StandardConversionExists (a.Type, pd.ParameterType (i)))
+ return false;
+
+ if (a_mod == Parameter.Modifier.REF ||
+ a_mod == Parameter.Modifier.OUT)
+ if (pd.ParameterType (i) != a.Type)
+ return false;
+ } else
+ return false;
+ }
+
+ return true;
+ }
+
+
+
+ // <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.
+ //
+ // use_standard: controls whether OverloadResolve should use the
+ // ConvertImplicit or ConvertImplicitStandard during overload resolution.
+ //
+ // 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, Location loc,
+ bool use_standard)
+ {
+ ArrayList afm = new ArrayList ();
+ int best_match_idx = -1;
+ MethodBase method = null;
+ int argument_count;
+
+ for (int i = me.Methods.Length; i > 0; ){
+ i--;
+ MethodBase candidate = me.Methods [i];
+ int x;
+
+ // Check if candidate is applicable (section 14.4.2.1)
+ if (!IsApplicable (Arguments, candidate))
+ continue;
+
+ x = BetterFunction (ec, Arguments, candidate, method, use_standard, loc);
+
+ if (x == 0)
+ continue;
+ else {
+ best_match_idx = i;
+ method = me.Methods [best_match_idx];
+ }
+ }
+
+ if (Arguments == null)
+ argument_count = 0;
+ else
+ argument_count = Arguments.Count;
+
+ //
+ // Now we see if we can find params functions, applicable in their expanded form
+ // since if they were applicable in their normal form, they would have been selected
+ // above anyways
+ //
+ if (best_match_idx == -1) {
+
+ for (int i = me.Methods.Length; i > 0; ) {
+ i--;
+ MethodBase candidate = me.Methods [i];
+
+ if (IsParamsMethodApplicable (Arguments, candidate)) {
+ best_match_idx = i;
+ method = me.Methods [best_match_idx];
+ break;
+ }
+ }
+ }
+
+ //
+ // Now we see if we can at least find a method with the same number of arguments
+ //
+ ParameterData pd;
+
+ if (best_match_idx == -1) {
+
+ for (int i = me.Methods.Length; i > 0;) {
+ i--;
+ MethodBase mb = me.Methods [i];
+ pd = GetParameterData (mb);
+
+ if (pd.Count == argument_count) {
+ best_match_idx = i;
+ method = me.Methods [best_match_idx];
+ break;
+ } else
+ continue;
+ }
+ }
+
+ if (method == null)
+ return null;
+
+ // And now convert implicitly, each argument to the required type
+
+ pd = GetParameterData (method);
+ int pd_count = pd.Count;
+
+ for (int j = 0; j < argument_count; j++) {
+
+ Argument a = (Argument) Arguments [j];
+ Expression a_expr = a.Expr;
+ Type parameter_type = pd.ParameterType (j);
+
+ //
+ // Note that we need to compare against the element type
+ // when we have a params method
+ //
+ if (pd.ParameterModifier (pd_count - 1) == Parameter.Modifier.PARAMS) {
+ if (j >= pd_count - 1)
+ parameter_type = pd.ParameterType (pd_count - 1).GetElementType ();
+ }
+
+ if (a.Type != parameter_type){
+ Expression conv;
+
+ if (use_standard)
+ conv = ConvertImplicitStandard (ec, a_expr, parameter_type, Location.Null);
+ else
+ conv = ConvertImplicit (ec, a_expr, parameter_type, Location.Null);
+
+ if (conv == null) {
+ if (!Location.IsNull (loc)) {
+ Error (1502, loc,
+ "The best overloaded match for method '" + FullMethodDesc (method)+
+ "' has some invalid arguments");
+ Error (1503, loc,
+ "Argument " + (j+1) +
+ ": Cannot convert from '" + Argument.FullDesc (a)
+ + "' to '" + pd.ParameterDesc (j) + "'");
+ }
+ return null;
+ }
+
+
+
+ //
+ // Update the argument with the implicit conversion
+ //
+ if (a_expr != conv)
+ a.Expr = conv;
+
+ // FIXME : For the case of params methods, we need to actually instantiate
+ // an array and initialize it with the argument values etc etc.
+
+ }
+
+ if (a.GetParameterModifier () != pd.ParameterModifier (j) &&
+ pd.ParameterModifier (j) != Parameter.Modifier.PARAMS) {
+ if (!Location.IsNull (loc)) {
+ Error (1502, loc,
+ "The best overloaded match for method '" + FullMethodDesc (method)+
+ "' has some invalid arguments");
+ Error (1503, loc,
+ "Argument " + (j+1) +
+ ": Cannot convert from '" + Argument.FullDesc (a)
+ + "' to '" + pd.ParameterDesc (j) + "'");
+ }
+ return null;
+ }
+
+
+ }
+
+ return method;
+ }
+
+ public static MethodBase OverloadResolve (EmitContext ec, MethodGroupExpr me,
+ ArrayList Arguments, Location loc)
+ {
+ return OverloadResolve (ec, me, Arguments, loc, false);
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // First, resolve the expression that is used to
+ // trigger the invocation
+ //
+ expr = expr.Resolve (ec);
+ 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)){
+ report118 (loc, this.expr, "method group");
+ return null;
+ }
+
+ //
+ // Next, evaluate all the expressions in the argument list
+ //
+ if (Arguments != null){
+ for (int i = Arguments.Count; i > 0;){
+ --i;
+ Argument a = (Argument) Arguments [i];
+
+ if (!a.Resolve (ec, loc))
+ return null;
+ }
+ }
+
+ method = OverloadResolve (ec, (MethodGroupExpr) this.expr, Arguments, loc);
+
+ if (method == null){
+ Error (-6, loc,
+ "Could not find any applicable function for this argument list");
+ return null;
+ }
+
+ if (method is MethodInfo)
+ type = ((MethodInfo)method).ReturnType;
+
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ // <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;
+ string array_type = t.FullName + "[]";
+ LocalBuilder array;
+
+ array = ig.DeclareLocal (Type.GetType (array_type));
+ IntLiteral.EmitInt (ig, count);
+ ig.Emit (OpCodes.Newarr, t);
+ ig.Emit (OpCodes.Stloc, array);
+
+ int top = arguments.Count;
+ for (int j = idx; j < top; j++){
+ a = (Argument) arguments [j];
+
+ ig.Emit (OpCodes.Ldloc, array);
+ IntLiteral.EmitInt (ig, j - idx);
+ a.Emit (ec);
+
+ ArrayAccess.EmitStoreOpcode (ig, t);
+ }
+ ig.Emit (OpCodes.Ldloc, array);
+ }
+
+ // <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
+ // </summary>
+
+ public static void EmitArguments (EmitContext ec, MethodBase mb, ArrayList arguments)
+ {
+ ParameterData pd = null;
+ int top;
+
+ if (arguments != null)
+ top = arguments.Count;
+ else
+ top = 0;
+
+ if (mb != null)
+ pd = GetParameterData (mb);
+
+ for (int i = 0; i < top; i++){
+ Argument a = (Argument) arguments [i];
+
+ if (pd != null){
+ if (pd.ParameterModifier (i) == Parameter.Modifier.PARAMS){
+ EmitParams (ec, i, arguments);
+ return;
+ }
+ }
+
+ a.Emit (ec);
+ }
+ }
+
+ public static void EmitCall (EmitContext ec,
+ bool is_static, Expression instance_expr,
+ MethodBase method, ArrayList Arguments)
+ {
+ ILGenerator ig = ec.ig;
+ bool struct_call = false;
+
+ if (!is_static){
+ //
+ // If this is ourselves, push "this"
+ //
+ if (instance_expr == null){
+ ig.Emit (OpCodes.Ldarg_0);
+ } else {
+ //
+ // Push the instance expression
+ //
+ if (instance_expr.Type.IsSubclassOf (TypeManager.value_type)){
+
+ struct_call = true;
+
+ //
+ // 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);
+ else {
+ Type t = instance_expr.Type;
+
+ instance_expr.Emit (ec);
+ LocalBuilder temp = ig.DeclareLocal (t);
+ ig.Emit (OpCodes.Stloc, temp);
+ ig.Emit (OpCodes.Ldloca, temp);
+ }
+ } else
+ instance_expr.Emit (ec);
+ }
+ }
+
+ if (Arguments != null)
+ EmitArguments (ec, method, Arguments);
+
+ if (is_static || struct_call){
+ if (method is MethodInfo)
+ ig.Emit (OpCodes.Call, (MethodInfo) method);
+ else
+ ig.Emit (OpCodes.Call, (ConstructorInfo) method);
+ } else {
+ if (method is MethodInfo)
+ ig.Emit (OpCodes.Callvirt, (MethodInfo) method);
+ else
+ ig.Emit (OpCodes.Callvirt, (ConstructorInfo) method);
+ }
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ MethodGroupExpr mg = (MethodGroupExpr) this.expr;
+ EmitCall (ec, method.IsStatic, mg.InstanceExpression, method, Arguments);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ Emit (ec);
+
+ //
+ // Pop the return value if there is one
+ //
+ if (method is MethodInfo){
+ if (((MethodInfo)method).ReturnType != TypeManager.void_type)
+ ec.ig.Emit (OpCodes.Pop);
+ }
+ }
+ }
+
+ public class New : ExpressionStatement {
+ public readonly ArrayList Arguments;
+ public readonly string RequestedType;
+
+ Location loc;
+ 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;
+
+ public New (string requested_type, ArrayList arguments, Location l)
+ {
+ RequestedType = requested_type;
+ Arguments = arguments;
+ loc = l;
+ }
+
+ public Expression ValueTypeVariable {
+ get {
+ return value_target;
+ }
+
+ set {
+ value_target = value;
+ }
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ type = ec.TypeContainer.LookupType (RequestedType, false);
+
+ if (type == null)
+ return null;
+
+ bool IsDelegate = TypeManager.IsDelegateType (type);
+
+ if (IsDelegate)
+ return (new NewDelegate (type, Arguments, loc)).Resolve (ec);
+
+ Expression ml;
+
+ ml = MemberLookup (ec, type, ".ctor", false,
+ MemberTypes.Constructor, AllBindingsFlags, loc);
+
+ bool is_struct = false;
+ is_struct = type.IsSubclassOf (TypeManager.value_type);
+
+ if (! (ml is MethodGroupExpr)){
+ if (!is_struct){
+ report118 (loc, ml, "method group");
+ return null;
+ }
+ }
+
+ if (ml != null) {
+ if (Arguments != null){
+ for (int i = Arguments.Count; i > 0;){
+ --i;
+ Argument a = (Argument) Arguments [i];
+
+ if (!a.Resolve (ec, loc))
+ return null;
+ }
+ }
+
+ method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml,
+ Arguments, loc);
+ }
+
+ if (method == null && !is_struct) {
+ Error (-6, loc,
+ "New invocation: Can not find a constructor for " +
+ "this argument list");
+ return null;
+ }
+
+ eclass = ExprClass.Value;
+ return this;
+ }
+
+ //
+ // 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
+ //
+ // Returns whether a value is left on the stack
+ //
+ bool DoEmit (EmitContext ec, bool need_value_on_stack)
+ {
+ if (method == null){
+ IMemoryLocation ml = (IMemoryLocation) value_target;
+
+ ml.AddressOf (ec);
+ } else {
+ Invocation.EmitArguments (ec, method, Arguments);
+ ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
+ return true;
+ }
+
+ //
+ // It must be a value type, sanity check
+ //
+ if (value_target != null){
+ ec.ig.Emit (OpCodes.Initobj, type);
+
+ if (need_value_on_stack){
+ value_target.Emit (ec);
+ return true;
+ }
+ return false;
+ }
+
+ throw new Exception ("No method and no value type");
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ DoEmit (ec, true);
+ }
+
+ public override void EmitStatement (EmitContext ec)
+ {
+ if (DoEmit (ec, false))
+ ec.ig.Emit (OpCodes.Pop);
+ }
+ }
+
+ // <summary>
+ // 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
+ // </remarks>
+ public class ArrayCreation : ExpressionStatement {
+
+ string RequestedType;
+ string Rank;
+ ArrayList Initializers;
+ Location loc;
+ ArrayList Arguments;
+
+ MethodBase method = null;
+ Type array_element_type;
+ bool IsOneDimensional = false;
+
+ bool IsBuiltinType = false;
+
+ int dimensions = 0;
+
+ public ArrayCreation (string requested_type, ArrayList exprs,
+ string rank, ArrayList initializers, Location l)
+ {
+ RequestedType = requested_type;
+ Rank = rank;
+ Initializers = initializers;
+ loc = l;
- //
- // 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)
+ Arguments = new ArrayList ();
+
+ foreach (Expression e in exprs)
+ Arguments.Add (new Argument (e, Argument.AType.Expression));
+
+ }
+
+ public ArrayCreation (string requested_type, string rank, ArrayList initializers, Location l)
{
- this.expr = expr;
- this.arguments = arguments;
+ RequestedType = requested_type;
+ Initializers = initializers;
+ loc = l;
+
+ Rank = rank.Substring (0, rank.LastIndexOf ("["));
+
+ string tmp = rank.Substring (rank.LastIndexOf ("["));
+
+ dimensions = tmp.Length - 1;
}
- public Expression Expr {
- get {
- return expr;
+ public static string FormArrayType (string base_type, int idx_count, string rank)
+ {
+ StringBuilder sb = new StringBuilder (base_type);
+
+ sb.Append (rank);
+
+ sb.Append ("[");
+ for (int i = 1; i < idx_count; i++)
+ sb.Append (",");
+ sb.Append ("]");
+
+ return sb.ToString ();
+ }
+
+ public static string FormElementType (string base_type, int idx_count, string rank)
+ {
+ StringBuilder sb = new StringBuilder (base_type);
+
+ sb.Append ("[");
+ for (int i = 1; i < idx_count; i++)
+ sb.Append (",");
+ sb.Append ("]");
+
+ sb.Append (rank);
+
+ string val = sb.ToString ();
+
+ return val.Substring (0, val.LastIndexOf ("["));
+ }
+
+ void error178 ()
+ {
+ Report.Error (178, loc, "Incorrectly structured array initializer");
+ }
+
+ bool ValidateInitializers (EmitContext ec)
+ {
+ if (Initializers == null)
+ return true;
+
+ Type underlying_type = ec.TypeContainer.LookupType (RequestedType, false);
+
+ ArrayList probe = Initializers;
+
+ if (Arguments != null) {
+ for (int i = 0; i < Arguments.Count; i++) {
+ Argument a = (Argument) Arguments [i];
+
+ Expression e = Expression.Reduce (ec, a.Expr);
+
+ if (!(e is Literal)) {
+ Report.Error (150, loc, "A constant value is expected");
+ return false;
+ }
+
+ int value = (int) ((Literal) e).GetValue ();
+
+ if (probe == null) {
+ error178 ();
+ return false;
+ }
+
+ if (value != probe.Count) {
+ error178 ();
+ return false;
+ }
+
+ if (probe [0] is ArrayList)
+ probe = (ArrayList) probe [0];
+ else {
+ for (int j = 0; j < probe.Count; ++j) {
+ Expression tmp = (Expression) probe [j];
+
+ tmp = tmp.Resolve (ec);
+
+ Expression conv = ConvertImplicitRequired (ec, tmp,
+ underlying_type, loc);
+
+ if (conv == null)
+ return false;
+ }
+
+ probe = null;
+ }
+ }
+
+ } else {
+ //
+ // Here is where we update dimension info in the case
+ // that the user skips doing that
+ //
+
+ Arguments = new ArrayList ();
+
+ for (probe = Initializers; probe != null; ) {
+ Expression e = new IntLiteral (probe.Count);
+
+ Arguments.Add (new Argument (e, Argument.AType.Expression));
+
+ if (probe [0] is ArrayList)
+ probe = (ArrayList) probe [0];
+ else {
+ for (int j = 0; j < probe.Count; ++j) {
+ Expression tmp = (Expression) probe [j];
+
+ tmp = tmp.Resolve (ec);
+
+ Expression conv = ConvertImplicitRequired (ec, tmp,
+ underlying_type, loc);
+
+ if (conv == null)
+ return false;
+ }
+
+ probe = null;
+ }
+ }
+
+ if (Arguments.Count != dimensions) {
+ error178 ();
+ return false;
+ }
}
+
+ return true;
}
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ int arg_count;
+
+ if (!ValidateInitializers (ec))
+ return null;
+
+ if (Arguments == null)
+ arg_count = 0;
+ else
+ arg_count = Arguments.Count;
+
+ string array_type = FormArrayType (RequestedType, arg_count, Rank);
+
+ string element_type = FormElementType (RequestedType, arg_count, Rank);
+
+ type = ec.TypeContainer.LookupType (array_type, false);
+
+ array_element_type = ec.TypeContainer.LookupType (element_type, false);
+
+ if (type == null)
+ return null;
+
+ if (arg_count == 1) {
+ IsOneDimensional = true;
+ eclass = ExprClass.Value;
+ return this;
+ }
- public ArrayList Arguments {
- get {
- return arguments;
+ IsBuiltinType = TypeManager.IsBuiltinType (type);
+
+ if (IsBuiltinType) {
+
+ Expression ml;
+
+ ml = MemberLookup (ec, type, ".ctor", false, MemberTypes.Constructor,
+ AllBindingsFlags, loc);
+
+ if (!(ml is MethodGroupExpr)){
+ report118 (loc, ml, "method group");
+ return null;
+ }
+
+ if (ml == null) {
+ Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
+ "this argument list");
+ return null;
+ }
+
+ if (Arguments != null) {
+ for (int i = arg_count; i > 0;){
+ --i;
+ Argument a = (Argument) Arguments [i];
+
+ if (!a.Resolve (ec, loc))
+ return null;
+ }
+ }
+
+ method = Invocation.OverloadResolve (ec, (MethodGroupExpr) ml, Arguments, loc);
+
+ if (method == null) {
+ Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
+ "this argument list");
+ return null;
+ }
+
+ eclass = ExprClass.Value;
+ return this;
+
+ } else {
+
+ ModuleBuilder mb = ec.TypeContainer.RootContext.ModuleBuilder;
+
+ ArrayList args = new ArrayList ();
+ if (Arguments != null){
+ for (int i = arg_count; i > 0;){
+ --i;
+ Argument a = (Argument) Arguments [i];
+
+ if (!a.Resolve (ec, loc))
+ return null;
+
+ args.Add (a.Type);
+ }
+ }
+
+ Type [] arg_types = null;
+
+ if (args.Count > 0)
+ arg_types = new Type [args.Count];
+
+ args.CopyTo (arg_types, 0);
+
+ method = mb.GetArrayMethod (type, ".ctor", CallingConventions.HasThis, null,
+ arg_types);
+
+ if (method == null) {
+ Report.Error (-6, loc, "New invocation: Can not find a constructor for " +
+ "this argument list");
+ return null;
+ }
+
+ eclass = ExprClass.Value;
+ return this;
+
}
}
- }
- public class New : Expression {
- ArrayList arguments;
- string requested_type;
+ public override void Emit (EmitContext ec)
+ {
+ ILGenerator ig = ec.ig;
+
+ if (IsOneDimensional) {
+ Invocation.EmitArguments (ec, null, Arguments);
+ ig.Emit (OpCodes.Newarr, array_element_type);
+
+ } else {
+ Invocation.EmitArguments (ec, null, Arguments);
+
+ if (IsBuiltinType)
+ ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
+ else
+ ig.Emit (OpCodes.Newobj, (MethodInfo) method);
+ }
+
+ if (Initializers != null){
+ FieldBuilder fb;
- public New (string requested_type, ArrayList arguments)
+ // FIXME: This is just sample data, need to fill with
+ // real values.
+ byte [] a = new byte [4] { 1, 2, 3, 4 };
+
+ fb = ec.TypeContainer.RootContext.MakeStaticData (a);
+
+ ig.Emit (OpCodes.Dup);
+ ig.Emit (OpCodes.Ldtoken, fb);
+ ig.Emit (OpCodes.Call, TypeManager.void_initializearray_array_fieldhandle);
+ }
+ }
+
+ public override void EmitStatement (EmitContext ec)
{
- this.requested_type = requested_type;
- this.arguments = arguments;
+ Emit (ec);
+ ec.ig.Emit (OpCodes.Pop);
}
- public ArrayList Arguments{
- get {
- return arguments;
+ }
+
+ //
+ // Represents the `this' construct
+ //
+ public class This : Expression, IAssignMethod, IMemoryLocation {
+ Location loc;
+
+ public This (Location loc)
+ {
+ this.loc = loc;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ eclass = ExprClass.Variable;
+ type = ec.TypeContainer.TypeBuilder;
+
+ if (ec.IsStatic){
+ Report.Error (26, loc,
+ "Keyword this not valid in static code");
+ return null;
}
+
+ return this;
}
-
- public string RequestedType {
- get {
- return requested_type;
+
+ public Expression DoResolveLValue (EmitContext ec)
+ {
+ DoResolve (ec);
+
+ if (ec.TypeContainer is Class){
+ Report.Error (1604, loc, "Cannot assign to `this'");
+ return null;
}
+
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldarg_0);
+ }
+
+ public void EmitAssign (EmitContext ec, Expression source)
+ {
+ source.Emit (ec);
+ ec.ig.Emit (OpCodes.Starg, 0);
}
- }
- public class This : Expression {
+ public void AddressOf (EmitContext ec)
+ {
+ ec.ig.Emit (OpCodes.Ldarga_S, (byte) 0);
+ }
}
+ // <summary>
+ // Implements the typeof operator
+ // </summary>
public class TypeOf : Expression {
- string queried_type;
+ public readonly string QueriedType;
+ Type typearg;
public TypeOf (string queried_type)
{
- this.queried_type = queried_type;
+ QueriedType = queried_type;
}
- public string QueriedType {
- get {
- return queried_type;
- }
+ public override Expression DoResolve (EmitContext ec)
+ {
+ typearg = ec.TypeContainer.LookupType (QueriedType, false);
+
+ if (typearg == null)
+ return null;
+
+ type = TypeManager.type_type;
+ eclass = ExprClass.Type;
+ 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 class SizeOf : Expression {
- string queried_type;
+ public readonly string QueriedType;
public SizeOf (string queried_type)
{
- this.queried_type = queried_type;
+ this.QueriedType = queried_type;
}
- public string QueriedType {
- get {
- return queried_type;
- }
+ public override Expression DoResolve (EmitContext ec)
+ {
+ // FIXME: Implement;
+ throw new Exception ("Unimplemented");
+ // return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Implement me");
}
}
public class MemberAccess : Expression {
+ public readonly string Identifier;
Expression expr;
- string id;
+ Expression member_lookup;
+ Location loc;
- public MemberAccess (Expression expr, string id)
+ public MemberAccess (Expression expr, string id, Location l)
{
this.expr = expr;
- this.id = id;
+ Identifier = id;
+ loc = l;
}
public Expression Expr {
}
}
- public string Identifier {
- get {
- return id;
+ void error176 (Location loc, string name)
+ {
+ Report.Error (176, loc, "Static member `" +
+ name + "' cannot be accessed " +
+ "with an instance reference, qualify with a " +
+ "type name instead");
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ //
+ // We are the sole users of ResolveWithSimpleName (ie, the only
+ // ones that can cope with it
+ //
+ expr = expr.ResolveWithSimpleName (ec);
+
+ if (expr == null)
+ return null;
+
+ if (expr is SimpleName){
+ SimpleName child_expr = (SimpleName) expr;
+
+ expr = new SimpleName (child_expr.Name + "." + Identifier, loc);
+
+ return expr.Resolve (ec);
+ }
+
+ member_lookup = MemberLookup (ec, expr.Type, Identifier, false, loc);
+
+ if (member_lookup == null)
+ return null;
+
+ //
+ // Method Groups
+ //
+ if (member_lookup is MethodGroupExpr){
+ MethodGroupExpr mg = (MethodGroupExpr) member_lookup;
+
+ //
+ // Type.MethodGroup
+ //
+ if (expr is TypeExpr){
+ if (!mg.RemoveInstanceMethods ()){
+ SimpleName.Error120 (loc, mg.Methods [0].Name);
+ return null;
+ }
+
+ return member_lookup;
+ }
+
+ //
+ // Instance.MethodGroup
+ //
+ if (!mg.RemoveStaticMethods ()){
+ error176 (loc, mg.Methods [0].Name);
+ return null;
+ }
+
+ mg.InstanceExpression = expr;
+
+ return member_lookup;
+ }
+
+ if (member_lookup is FieldExpr){
+ FieldExpr fe = (FieldExpr) member_lookup;
+ FieldInfo fi = fe.FieldInfo;
+
+ if (fi.IsLiteral) {
+ Type t = fi.FieldType;
+ object o;
+
+ if (fi is FieldBuilder)
+ o = TypeManager.GetValue ((FieldBuilder) fi);
+ else
+ o = fi.GetValue (fi);
+
+ if (t.IsSubclassOf (TypeManager.enum_type)) {
+ Expression enum_member = MemberLookup (ec, t, "value__", false, loc);
+ Type underlying_type = enum_member.Type;
+
+ Expression e = Literalize (o, underlying_type);
+ e.Resolve (ec);
+
+ return new EnumLiteral (e, t);
+ }
+
+ Expression exp = Literalize (o, t);
+ exp.Resolve (ec);
+
+ return exp;
+ }
+
+ if (expr is TypeExpr){
+ if (!fe.FieldInfo.IsStatic){
+ error176 (loc, fe.FieldInfo.Name);
+ return null;
+ }
+ return member_lookup;
+ } else {
+ if (fe.FieldInfo.IsStatic){
+ error176 (loc, fe.FieldInfo.Name);
+ return null;
+ }
+ fe.InstanceExpression = expr;
+
+ return fe;
+ }
+ }
+
+ if (member_lookup is PropertyExpr){
+ PropertyExpr pe = (PropertyExpr) member_lookup;
+
+ if (expr is TypeExpr){
+ if (!pe.IsStatic){
+ SimpleName.Error120 (loc, pe.PropertyInfo.Name);
+ return null;
+ }
+ return pe;
+ } else {
+ if (pe.IsStatic){
+ error176 (loc, pe.PropertyInfo.Name);
+ return null;
+ }
+ pe.InstanceExpression = expr;
+
+ return pe;
+ }
}
+
+ Console.WriteLine ("Support for [" + member_lookup + "] is not present yet");
+ Environment.Exit (0);
+ return null;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should not happen I think");
}
+
}
- public class BuiltinTypeAccess : Expression {
- string access_base;
- string method;
+ public class CheckedExpr : Expression {
+
+ public Expression Expr;
+
+ public CheckedExpr (Expression e)
+ {
+ Expr = e;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ Expr = Expr.Resolve (ec);
+
+ if (Expr == null)
+ return null;
+
+ eclass = Expr.ExprClass;
+ type = Expr.Type;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ bool last_check = ec.CheckState;
+
+ ec.CheckState = true;
+ Expr.Emit (ec);
+ ec.CheckState = last_check;
+ }
- public BuiltinTypeAccess (string type, string method)
+ }
+
+ public class UnCheckedExpr : Expression {
+
+ public Expression Expr;
+
+ public UnCheckedExpr (Expression e)
{
- System.Console.WriteLine ("DUDE! This type should be fully resolved!");
- this.access_base = access_base;
- this.method = method;
+ Expr = e;
}
- public string AccessBase {
- get {
- return access_base;
- }
+ public override Expression DoResolve (EmitContext ec)
+ {
+ Expr = Expr.Resolve (ec);
+
+ if (Expr == null)
+ return null;
+
+ eclass = Expr.ExprClass;
+ type = Expr.Type;
+ return this;
}
- public string Method {
- get {
- return method;
- }
+ public override void Emit (EmitContext ec)
+ {
+ bool last_check = ec.CheckState;
+
+ ec.CheckState = false;
+ Expr.Emit (ec);
+ ec.CheckState = last_check;
}
+
}
- public class MethodGroup : Expression {
- Hashtable signatures;
- string name;
+ public class ElementAccess : Expression {
+ public ArrayList Arguments;
+ public Expression Expr;
+ public Location loc;
- public MethodGroup (string name)
+ public ElementAccess (Expression e, ArrayList e_list, Location l)
{
- signatures = new Hashtable ();
- this.name = name;
+ Expr = e;
+
+ Arguments = new ArrayList ();
+ foreach (Expression tmp in e_list)
+ Arguments.Add (new Argument (tmp, Argument.AType.Expression));
+
+ loc = l;
}
- public bool Add (Method method)
+ bool CommonResolve (EmitContext ec)
{
- string sig = method.ArgumentSignature;
+ Expr = Expr.Resolve (ec);
- if (signatures.Contains (sig))
+ if (Expr == null)
return false;
- signatures.Add (sig, method);
+ if (Arguments == null)
+ return false;
+
+ for (int i = Arguments.Count; i > 0;){
+ --i;
+ Argument a = (Argument) Arguments [i];
+
+ if (!a.Resolve (ec, loc))
+ return false;
+ }
+
return true;
}
+
+ 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.
+ //
+ if (Expr.Type.IsSubclassOf (TypeManager.array_type))
+ return (new ArrayAccess (this)).Resolve (ec);
+ else
+ return (new IndexerAccess (this)).Resolve (ec);
+ }
- public string Name {
- get {
- return name;
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ if (!CommonResolve (ec))
+ return null;
+
+ if (Expr.Type.IsSubclassOf (TypeManager.array_type))
+ return (new ArrayAccess (this)).ResolveLValue (ec, right_side);
+ else
+ return (new IndexerAccess (this)).ResolveLValue (ec, right_side);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Should never be reached");
+ }
+ }
+
+ //
+ // Implements array access
+ //
+ public class ArrayAccess : Expression, IAssignMethod {
+ //
+ // Points to our "data" repository
+ //
+ ElementAccess ea;
+
+ public ArrayAccess (ElementAccess ea_data)
+ {
+ ea = ea_data;
+ eclass = ExprClass.Variable;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ if (ea.Expr.ExprClass != ExprClass.Variable) {
+ report118 (ea.loc, ea.Expr, "variable");
+ return null;
+ }
+
+ Type t = ea.Expr.Type;
+
+ if (t.GetArrayRank () != ea.Arguments.Count){
+ Report.Error (22, ea.loc,
+ "Incorrect number of indexes for array " +
+ " expected: " + t.GetArrayRank () + " got: " +
+ ea.Arguments.Count);
+ return null;
}
+ type = t.GetElementType ();
+ eclass = ExprClass.Variable;
+
+ return this;
}
- public Hashtable Methods {
- get {
- return signatures;
+ // <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)
+ ig.Emit (OpCodes.Ldelem_I1);
+ else if (type == TypeManager.sbyte_type)
+ ig.Emit (OpCodes.Ldelem_U1);
+ else if (type == TypeManager.short_type)
+ ig.Emit (OpCodes.Ldelem_I2);
+ else if (type == TypeManager.ushort_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
+ ig.Emit (OpCodes.Ldelem_Ref);
+ }
+
+ // <summary>
+ // Emits the right opcode to store an object of Type `t'
+ // from an array of T.
+ // </summary>
+ static public void EmitStoreOpcode (ILGenerator ig, Type t)
+ {
+ if (t == TypeManager.byte_type || t == TypeManager.sbyte_type)
+ ig.Emit (OpCodes.Stelem_I1);
+ else if (t == TypeManager.short_type || t == TypeManager.ushort_type)
+ ig.Emit (OpCodes.Stelem_I2);
+ else if (t == TypeManager.int32_type || t == TypeManager.uint32_type)
+ ig.Emit (OpCodes.Stelem_I4);
+ else if (t == TypeManager.int64_type || t == TypeManager.uint64_type)
+ ig.Emit (OpCodes.Stelem_I8);
+ else if (t == TypeManager.float_type)
+ ig.Emit (OpCodes.Stelem_R4);
+ else if (t == TypeManager.double_type)
+ ig.Emit (OpCodes.Stelem_R8);
+ else if (t == TypeManager.intptr_type)
+ ig.Emit (OpCodes.Stelem_I);
+ else
+ ig.Emit (OpCodes.Stelem_Ref);
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+
+ ea.Expr.Emit (ec);
+
+ foreach (Argument a in ea.Arguments)
+ a.Expr.Emit (ec);
+
+ if (rank == 1)
+ EmitLoadOpcode (ig, type);
+ else {
+ ModuleBuilder mb = ec.TypeContainer.RootContext.ModuleBuilder;
+ Type [] args = new Type [ea.Arguments.Count];
+ MethodInfo get;
+
+ int i = 0;
+
+ foreach (Argument a in ea.Arguments)
+ args [i++] = a.Type;
+
+ get = mb.GetArrayMethod (
+ ea.Expr.Type, "Get",
+ CallingConventions.HasThis |
+ CallingConventions.Standard,
+ type, args);
+
+ ig.Emit (OpCodes.Call, get);
+ }
+ }
+
+ public void EmitAssign (EmitContext ec, Expression source)
+ {
+ int rank = ea.Expr.Type.GetArrayRank ();
+ ILGenerator ig = ec.ig;
+
+ ea.Expr.Emit (ec);
+
+ foreach (Argument a in ea.Arguments)
+ a.Expr.Emit (ec);
+
+ source.Emit (ec);
+
+ Type t = source.Type;
+ if (rank == 1)
+ EmitStoreOpcode (ig, t);
+ else {
+ ModuleBuilder mb = ec.TypeContainer.RootContext.ModuleBuilder;
+ Type [] args = new Type [ea.Arguments.Count + 1];
+ MethodInfo set;
+
+ int i = 0;
+
+ foreach (Argument a in ea.Arguments)
+ args [i++] = a.Type;
+
+ args [i] = type;
+
+ set = mb.GetArrayMethod (
+ ea.Expr.Type, "Set",
+ CallingConventions.HasThis |
+ CallingConventions.Standard,
+ TypeManager.void_type, args);
+
+ ig.Emit (OpCodes.Call, set);
}
}
}
-}
+ class Indexers {
+ public ArrayList getters, setters;
+ static Hashtable map;
+
+ static Indexers ()
+ {
+ map = new Hashtable ();
+ }
+
+ Indexers (MemberInfo [] mi)
+ {
+ foreach (PropertyInfo property in mi){
+ MethodInfo get, set;
+
+ get = property.GetGetMethod (true);
+ if (get != null){
+ if (getters == null)
+ getters = new ArrayList ();
+
+ getters.Add (get);
+ }
+
+ set = property.GetSetMethod (true);
+ if (set != null){
+ if (setters == null)
+ setters = new ArrayList ();
+ setters.Add (set);
+ }
+ }
+ }
+
+ static public Indexers GetIndexersForType (Type t, TypeManager tm, Location loc)
+ {
+ Indexers ix = (Indexers) map [t];
+ string p_name = TypeManager.IndexerPropertyName (t);
+
+ if (ix != null)
+ return ix;
+
+ MemberInfo [] mi = tm.FindMembers (
+ t, MemberTypes.Property,
+ BindingFlags.Public | BindingFlags.Instance,
+ Type.FilterName, p_name);
+
+ if (mi == null || mi.Length == 0){
+ Report.Error (21, loc,
+ "Type `" + TypeManager.CSharpName (t) + "' does not have " +
+ "any indexers defined");
+ return null;
+ }
+
+ ix = new Indexers (mi);
+ map [t] = ix;
+
+ return ix;
+ }
+ }
+
+ // <summary>
+ // Expressions that represent an indexer call.
+ // </summary>
+ public class IndexerAccess : Expression, IAssignMethod {
+ //
+ // Points to our "data" repository
+ //
+ ElementAccess ea;
+ MethodInfo get, set;
+ Indexers ilist;
+ ArrayList set_arguments;
+
+ public IndexerAccess (ElementAccess ea_data)
+ {
+ ea = ea_data;
+ eclass = ExprClass.Value;
+ }
+ public override Expression DoResolve (EmitContext ec)
+ {
+ Type indexer_type = ea.Expr.Type;
+
+ //
+ // 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.
+
+ if (ilist == null)
+ ilist = Indexers.GetIndexersForType (
+ indexer_type, ec.TypeContainer.RootContext.TypeManager, ea.loc);
+
+
+ //
+ // Step 2: find the proper match
+ //
+ if (ilist != null && ilist.getters != null && ilist.getters.Count > 0)
+ get = (MethodInfo) Invocation.OverloadResolve (
+ ec, new MethodGroupExpr (ilist.getters), ea.Arguments, ea.loc);
+
+ if (get == null){
+ Report.Error (154, ea.loc,
+ "indexer can not be used in this context, because " +
+ "it lacks a `get' accessor");
+ return null;
+ }
+
+ type = get.ReturnType;
+ eclass = ExprClass.IndexerAccess;
+ return this;
+ }
+
+ public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
+ {
+ Type indexer_type = ea.Expr.Type;
+ Type right_type = right_side.Type;
+
+ if (ilist == null)
+ ilist = Indexers.GetIndexersForType (
+ indexer_type, ec.TypeContainer.RootContext.TypeManager, ea.loc);
+
+ if (ilist != null && ilist.setters != null && ilist.setters.Count > 0){
+ set_arguments = (ArrayList) ea.Arguments.Clone ();
+ set_arguments.Add (new Argument (right_side, Argument.AType.Expression));
+
+ set = (MethodInfo) Invocation.OverloadResolve (
+ ec, new MethodGroupExpr (ilist.setters), set_arguments, ea.loc);
+ }
+
+ if (set == null){
+ Report.Error (200, ea.loc,
+ "indexer X.this [" + TypeManager.CSharpName (right_type) +
+ "] lacks a `set' accessor");
+ return null;
+ }
+
+ type = TypeManager.void_type;
+ eclass = ExprClass.IndexerAccess;
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ Invocation.EmitCall (ec, false, ea.Expr, get, ea.Arguments);
+ }
+
+ //
+ // 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)
+ {
+ Invocation.EmitCall (ec, false, ea.Expr, set, set_arguments);
+ }
+ }
+
+ public class BaseAccess : Expression {
+
+ public enum BaseAccessType : byte {
+ Member,
+ Indexer
+ };
+
+ public readonly BaseAccessType BAType;
+ public readonly string Member;
+ public readonly ArrayList Arguments;
+
+ public BaseAccess (BaseAccessType t, string member, ArrayList args)
+ {
+ BAType = t;
+ Member = member;
+ Arguments = args;
+
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ // FIXME: Implement;
+ throw new Exception ("Unimplemented");
+ // return this;
+ }
+ public override void Emit (EmitContext ec)
+ {
+ throw new Exception ("Unimplemented");
+ }
+ }
+
+ // <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
+ // </summary>
+
+ public class EmptyExpression : Expression {
+ public EmptyExpression ()
+ {
+ type = TypeManager.object_type;
+ eclass = ExprClass.Value;
+ }
+
+ public EmptyExpression (Type t)
+ {
+ type = t;
+ eclass = ExprClass.Value;
+ }
+
+ public override Expression DoResolve (EmitContext ec)
+ {
+ return this;
+ }
+
+ public override void Emit (EmitContext ec)
+ {
+ // nothing, as we only exist to not do anything.
+ }
+ }
+
+ public class UserCast : Expression {
+ MethodBase method;
+ Expression source;
+
+ public UserCast (MethodInfo method, Expression source)
+ {
+ this.method = method;
+ this.source = source;
+ type = method.ReturnType;
+ eclass = ExprClass.Value;
+ }
+ 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);
+ }
+
+ }
+}
projects / mono.git / blobdiff