//
// expression.cs: Expression representation for the IL tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@seznam.cz)
//
// (C) 2001, 2002, 2003 Ximian, Inc.
// (C) 2003, 2004 Novell, Inc.
//
#define USE_OLD
namespace Mono.CSharp {
using System;
using System.Collections;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
///
/// 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.
///
public class StaticCallExpr : ExpressionStatement {
ArrayList args;
MethodInfo mi;
public StaticCallExpr (MethodInfo m, ArrayList a, Location l)
{
mi = m;
args = a;
type = m.ReturnType;
eclass = ExprClass.Value;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
//
// We are born fully resolved
//
return this;
}
public override void Emit (EmitContext ec)
{
Invocation.EmitArguments (ec, args, false, null);
ec.ig.Emit (OpCodes.Call, mi);
return;
}
static public StaticCallExpr MakeSimpleCall (EmitContext ec, MethodGroupExpr mg,
Expression e, Location loc)
{
ArrayList args;
args = new ArrayList (1);
Argument a = new Argument (e, Argument.AType.Expression);
// We need to resolve the arguments before sending them in !
if (!a.Resolve (ec, loc))
return null;
args.Add (a);
mg = mg.OverloadResolve (ec, ref args, false, loc);
if (mg == null)
return null;
return new StaticCallExpr ((MethodInfo) mg, args, loc);
}
public override void EmitStatement (EmitContext ec)
{
Emit (ec);
if (TypeManager.TypeToCoreType (type) != TypeManager.void_type)
ec.ig.Emit (OpCodes.Pop);
}
public MethodInfo Method {
get { return mi; }
}
}
public class ParenthesizedExpression : Expression
{
public Expression Expr;
public ParenthesizedExpression (Expression expr)
{
this.Expr = expr;
}
public override Expression DoResolve (EmitContext ec)
{
Expr = Expr.Resolve (ec);
return Expr;
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should not happen");
}
public override Location Location
{
get {
return Expr.Location;
}
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
ParenthesizedExpression target = (ParenthesizedExpression) t;
target.Expr = Expr.Clone (clonectx);
}
}
//
// Unary implements unary expressions.
//
public class Unary : Expression {
public enum Operator : byte {
UnaryPlus, UnaryNegation, LogicalNot, OnesComplement,
Indirection, AddressOf, TOP
}
public readonly Operator Oper;
public Expression Expr;
public Unary (Operator op, Expression expr, Location loc)
{
this.Oper = op;
this.Expr = expr;
this.loc = loc;
}
///
/// Returns a stringified representation of the Operator
///
static public string OperName (Operator oper)
{
switch (oper){
case Operator.UnaryPlus:
return "+";
case Operator.UnaryNegation:
return "-";
case Operator.LogicalNot:
return "!";
case Operator.OnesComplement:
return "~";
case Operator.AddressOf:
return "&";
case Operator.Indirection:
return "*";
}
return oper.ToString ();
}
public static readonly string [] oper_names;
static Unary ()
{
oper_names = new string [(int)Operator.TOP];
oper_names [(int) Operator.UnaryPlus] = "op_UnaryPlus";
oper_names [(int) Operator.UnaryNegation] = "op_UnaryNegation";
oper_names [(int) Operator.LogicalNot] = "op_LogicalNot";
oper_names [(int) Operator.OnesComplement] = "op_OnesComplement";
oper_names [(int) Operator.Indirection] = "op_Indirection";
oper_names [(int) Operator.AddressOf] = "op_AddressOf";
}
public static void Error_OperatorCannotBeApplied (Location loc, string oper, Type t)
{
Error_OperatorCannotBeApplied (loc, oper, TypeManager.CSharpName (t));
}
public static void Error_OperatorCannotBeApplied (Location loc, string oper, string type)
{
Report.Error (23, loc, "The `{0}' operator cannot be applied to operand of type `{1}'",
oper, type);
}
void Error23 (Type t)
{
Error_OperatorCannotBeApplied (loc, OperName (Oper), t);
}
//
// This routine will attempt to simplify the unary expression when the
// argument is a constant.
//
Constant TryReduceConstant (EmitContext ec, Constant e)
{
Type expr_type = e.Type;
switch (Oper){
case Operator.UnaryPlus:
// Unary numeric promotions
if (expr_type == TypeManager.byte_type)
return new IntConstant (((ByteConstant)e).Value, e.Location);
if (expr_type == TypeManager.sbyte_type)
return new IntConstant (((SByteConstant)e).Value, e.Location);
if (expr_type == TypeManager.short_type)
return new IntConstant (((ShortConstant)e).Value, e.Location);
if (expr_type == TypeManager.ushort_type)
return new IntConstant (((UShortConstant)e).Value, e.Location);
if (expr_type == TypeManager.char_type)
return new IntConstant (((CharConstant)e).Value, e.Location);
// Predefined operators
if (expr_type == TypeManager.int32_type || expr_type == TypeManager.uint32_type ||
expr_type == TypeManager.int64_type || expr_type == TypeManager.uint64_type ||
expr_type == TypeManager.float_type || expr_type == TypeManager.double_type ||
expr_type == TypeManager.decimal_type)
{
return e;
}
return null;
case Operator.UnaryNegation:
// Unary numeric promotions
if (expr_type == TypeManager.byte_type)
return new IntConstant (-((ByteConstant)e).Value, e.Location);
if (expr_type == TypeManager.sbyte_type)
return new IntConstant (-((SByteConstant)e).Value, e.Location);
if (expr_type == TypeManager.short_type)
return new IntConstant (-((ShortConstant)e).Value, e.Location);
if (expr_type == TypeManager.ushort_type)
return new IntConstant (-((UShortConstant)e).Value, e.Location);
if (expr_type == TypeManager.char_type)
return new IntConstant (-((CharConstant)e).Value, e.Location);
// Predefined operators
if (expr_type == TypeManager.int32_type) {
int value = ((IntConstant)e).Value;
if (value == int.MinValue) {
if (ec.ConstantCheckState) {
ConstantFold.Error_CompileTimeOverflow (loc);
return null;
}
return e;
}
return new IntConstant (-value, e.Location);
}
if (expr_type == TypeManager.int64_type) {
long value = ((LongConstant)e).Value;
if (value == long.MinValue) {
if (ec.ConstantCheckState) {
ConstantFold.Error_CompileTimeOverflow (loc);
return null;
}
return e;
}
return new LongConstant (-value, e.Location);
}
if (expr_type == TypeManager.uint32_type) {
UIntLiteral uil = e as UIntLiteral;
if (uil != null) {
if (uil.Value == 2147483648)
return new IntLiteral (int.MinValue, e.Location);
return new LongLiteral (-uil.Value, e.Location);
}
return new LongConstant (-((UIntConstant)e).Value, e.Location);
}
if (expr_type == TypeManager.uint64_type) {
ULongLiteral ull = e as ULongLiteral;
if (ull != null && ull.Value == 9223372036854775808)
return new LongLiteral (long.MinValue, e.Location);
return null;
}
if (expr_type == TypeManager.float_type) {
FloatLiteral fl = e as FloatLiteral;
// For better error reporting
if (fl != null) {
fl.Value = -fl.Value;
return fl;
}
return new FloatConstant (-((FloatConstant)e).Value, e.Location);
}
if (expr_type == TypeManager.double_type) {
DoubleLiteral dl = e as DoubleLiteral;
// For better error reporting
if (dl != null) {
dl.Value = -dl.Value;
return dl;
}
return new DoubleConstant (-((DoubleConstant)e).Value, e.Location);
}
if (expr_type == TypeManager.decimal_type)
return new DecimalConstant (-((DecimalConstant)e).Value, e.Location);
return null;
case Operator.LogicalNot:
if (expr_type != TypeManager.bool_type)
return null;
BoolConstant b = (BoolConstant) e;
return new BoolConstant (!(b.Value), b.Location);
case Operator.OnesComplement:
// Unary numeric promotions
if (expr_type == TypeManager.byte_type)
return new IntConstant (~((ByteConstant)e).Value, e.Location);
if (expr_type == TypeManager.sbyte_type)
return new IntConstant (~((SByteConstant)e).Value, e.Location);
if (expr_type == TypeManager.short_type)
return new IntConstant (~((ShortConstant)e).Value, e.Location);
if (expr_type == TypeManager.ushort_type)
return new IntConstant (~((UShortConstant)e).Value, e.Location);
if (expr_type == TypeManager.char_type)
return new IntConstant (~((CharConstant)e).Value, e.Location);
// Predefined operators
if (expr_type == TypeManager.int32_type)
return new IntConstant (~((IntConstant)e).Value, e.Location);
if (expr_type == TypeManager.uint32_type)
return new UIntConstant (~((UIntConstant)e).Value, e.Location);
if (expr_type == TypeManager.int64_type)
return new LongConstant (~((LongConstant)e).Value, e.Location);
if (expr_type == TypeManager.uint64_type){
return new ULongConstant (~((ULongConstant)e).Value, e.Location);
}
if (e is EnumConstant) {
e = TryReduceConstant (ec, ((EnumConstant)e).Child);
if (e != null)
e = new EnumConstant (e, expr_type);
return e;
}
return null;
case Operator.AddressOf:
return e;
case Operator.Indirection:
return e;
}
throw new Exception ("Can not constant fold: " + Oper.ToString());
}
Expression ResolveOperator (EmitContext ec)
{
//
// Step 1: Default operations on CLI native types.
//
// Attempt to use a constant folding operation.
Constant cexpr = Expr as Constant;
if (cexpr != null) {
cexpr = TryReduceConstant (ec, cexpr);
if (cexpr != null) {
return cexpr;
}
}
//
// Step 2: Perform Operator Overload location
//
Type expr_type = Expr.Type;
string op_name = oper_names [(int) Oper];
Expression mg = MemberLookup (ec.ContainerType, expr_type, op_name, MemberTypes.Method, AllBindingFlags, loc);
if (mg != null) {
Expression e = StaticCallExpr.MakeSimpleCall (
ec, (MethodGroupExpr) mg, Expr, loc);
if (e == null){
Error23 (expr_type);
return null;
}
return e;
}
switch (Oper){
case Operator.LogicalNot:
if (expr_type != TypeManager.bool_type) {
Expr = ResolveBoolean (ec, Expr, loc);
if (Expr == null){
Error23 (expr_type);
return null;
}
}
type = TypeManager.bool_type;
return this;
case Operator.OnesComplement:
// Unary numeric promotions
if (expr_type == TypeManager.byte_type || expr_type == TypeManager.sbyte_type ||
expr_type == TypeManager.short_type || expr_type == TypeManager.ushort_type ||
expr_type == TypeManager.char_type)
{
type = TypeManager.int32_type;
return EmptyCast.Create (this, type);
}
// Predefined operators
if (expr_type == TypeManager.int32_type || expr_type == TypeManager.uint32_type ||
expr_type == TypeManager.int64_type || expr_type == TypeManager.uint64_type ||
TypeManager.IsEnumType (expr_type))
{
type = expr_type;
return this;
}
type = TypeManager.int32_type;
Expr = Convert.ImplicitUserConversion(ec, Expr, type, loc);
if (Expr != null)
return this;
Error23 (expr_type);
return null;
case Operator.AddressOf:
if (!ec.InUnsafe) {
UnsafeError (loc);
return null;
}
if (!TypeManager.VerifyUnManaged (Expr.Type, loc)){
return null;
}
IVariable variable = Expr as IVariable;
bool is_fixed = variable != null && variable.VerifyFixed ();
if (!ec.InFixedInitializer && !is_fixed) {
Error (212, "You can only take the address of unfixed expression inside " +
"of a fixed statement initializer");
return null;
}
if (ec.InFixedInitializer && is_fixed) {
Error (213, "You cannot use the fixed statement to take the address of an already fixed expression");
return null;
}
LocalVariableReference lr = Expr as LocalVariableReference;
if (lr != null){
if (lr.local_info.IsCaptured){
AnonymousMethod.Error_AddressOfCapturedVar (lr.Name, loc);
return null;
}
lr.local_info.AddressTaken = true;
lr.local_info.Used = true;
}
ParameterReference pr = Expr as ParameterReference;
if ((pr != null) && pr.Parameter.IsCaptured) {
AnonymousMethod.Error_AddressOfCapturedVar (pr.Name, loc);
return null;
}
// According to the specs, a variable is considered definitely assigned if you take
// its address.
if ((variable != null) && (variable.VariableInfo != null)){
variable.VariableInfo.SetAssigned (ec);
}
type = TypeManager.GetPointerType (Expr.Type);
return this;
case Operator.Indirection:
if (!ec.InUnsafe){
UnsafeError (loc);
return null;
}
if (!expr_type.IsPointer){
Error (193, "The * or -> operator must be applied to a pointer");
return null;
}
//
// We create an Indirection expression, because
// it can implement the IMemoryLocation.
//
return new Indirection (Expr, loc);
case Operator.UnaryPlus:
// Unary numeric promotions
if (expr_type == TypeManager.byte_type || expr_type == TypeManager.sbyte_type ||
expr_type == TypeManager.short_type || expr_type == TypeManager.ushort_type ||
expr_type == TypeManager.char_type)
{
return EmptyCast.Create (Expr, TypeManager.int32_type);
}
// Predefined operators
if (expr_type == TypeManager.int32_type || expr_type == TypeManager.uint32_type ||
expr_type == TypeManager.int64_type || expr_type == TypeManager.uint64_type ||
expr_type == TypeManager.float_type || expr_type == TypeManager.double_type ||
expr_type == TypeManager.decimal_type)
{
return Expr;
}
Expr = Convert.ImplicitUserConversion(ec, Expr, TypeManager.int32_type, loc);
if (Expr != null) {
// Because we can completely ignore unary +
return Expr;
}
Error23 (expr_type);
return null;
case Operator.UnaryNegation:
//
// transform - - expr into expr
//
Unary u = Expr as Unary;
if (u != null && u.Oper == Operator.UnaryNegation) {
return u.Expr;
}
// Unary numeric promotions
if (expr_type == TypeManager.byte_type || expr_type == TypeManager.sbyte_type ||
expr_type == TypeManager.short_type || expr_type == TypeManager.ushort_type ||
expr_type == TypeManager.char_type)
{
type = TypeManager.int32_type;
return EmptyCast.Create (this, type);
}
//
// Predefined operators
//
if (expr_type == TypeManager.uint32_type) {
type = TypeManager.int64_type;
Expr = Convert.ImplicitNumericConversion (Expr, type);
return this;
}
if (expr_type == TypeManager.int32_type || expr_type == TypeManager.int64_type ||
expr_type == TypeManager.float_type || expr_type == TypeManager.double_type ||
expr_type == TypeManager.decimal_type)
{
type = expr_type;
return this;
}
//
// User conversion
type = TypeManager.int32_type;
Expr = Convert.ImplicitUserConversion(ec, Expr, type, loc);
if (Expr != null)
return this;
Error23 (expr_type);
return null;
}
Error (187, "No such operator '" + OperName (Oper) + "' defined for type '" +
TypeManager.CSharpName (expr_type) + "'");
return null;
}
public override Expression DoResolve (EmitContext ec)
{
if (Oper == Operator.AddressOf) {
Expr = Expr.DoResolveLValue (ec, new EmptyExpression ());
if (Expr == null || Expr.eclass != ExprClass.Variable){
Error (211, "Cannot take the address of the given expression");
return null;
}
}
else
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
#if GMCS_SOURCE
if (TypeManager.IsNullableValueType (Expr.Type))
return new Nullable.LiftedUnaryOperator (Oper, Expr, loc).Resolve (ec);
#endif
eclass = ExprClass.Value;
return ResolveOperator (ec);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right)
{
if (Oper == Operator.Indirection)
return DoResolve (ec);
return null;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
switch (Oper) {
case Operator.UnaryPlus:
throw new Exception ("This should be caught by Resolve");
case Operator.UnaryNegation:
if (ec.CheckState && type != TypeManager.float_type && type != TypeManager.double_type) {
ig.Emit (OpCodes.Ldc_I4_0);
if (type == TypeManager.int64_type)
ig.Emit (OpCodes.Conv_U8);
Expr.Emit (ec);
ig.Emit (OpCodes.Sub_Ovf);
} else {
Expr.Emit (ec);
ig.Emit (OpCodes.Neg);
}
break;
case Operator.LogicalNot:
Expr.Emit (ec);
ig.Emit (OpCodes.Ldc_I4_0);
ig.Emit (OpCodes.Ceq);
break;
case Operator.OnesComplement:
Expr.Emit (ec);
ig.Emit (OpCodes.Not);
break;
case Operator.AddressOf:
((IMemoryLocation)Expr).AddressOf (ec, AddressOp.LoadStore);
break;
default:
throw new Exception ("This should not happen: Operator = "
+ Oper.ToString ());
}
}
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
if (Oper == Operator.LogicalNot)
Expr.EmitBranchable (ec, target, !on_true);
else
base.EmitBranchable (ec, target, on_true);
}
public override string ToString ()
{
return "Unary (" + Oper + ", " + Expr + ")";
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Unary target = (Unary) t;
target.Expr = Expr.Clone (clonectx);
}
}
//
// Unary operators are turned into Indirection expressions
// after semantic analysis (this is so we can take the address
// of an indirection).
//
public class Indirection : Expression, IMemoryLocation, IAssignMethod, IVariable {
Expression expr;
LocalTemporary temporary;
bool prepared;
public Indirection (Expression expr, Location l)
{
this.expr = expr;
type = TypeManager.HasElementType (expr.Type) ? TypeManager.GetElementType (expr.Type) : expr.Type;
eclass = ExprClass.Variable;
loc = l;
}
public override void Emit (EmitContext ec)
{
if (!prepared)
expr.Emit (ec);
LoadFromPtr (ec.ig, Type);
}
public void Emit (EmitContext ec, bool leave_copy)
{
Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
temporary = new LocalTemporary (expr.Type);
temporary.Store (ec);
}
}
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
{
prepared = prepare_for_load;
expr.Emit (ec);
if (prepare_for_load)
ec.ig.Emit (OpCodes.Dup);
source.Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
temporary = new LocalTemporary (expr.Type);
temporary.Store (ec);
}
StoreFromPtr (ec.ig, type);
if (temporary != null) {
temporary.Emit (ec);
temporary.Release (ec);
}
}
public void AddressOf (EmitContext ec, AddressOp Mode)
{
expr.Emit (ec);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return DoResolve (ec);
}
public override Expression DoResolve (EmitContext ec)
{
//
// Born fully resolved
//
return this;
}
public override string ToString ()
{
return "*(" + expr + ")";
}
#region IVariable Members
public VariableInfo VariableInfo {
get { return null; }
}
public bool VerifyFixed ()
{
// A pointer-indirection is always fixed.
return true;
}
#endregion
}
///
/// Unary Mutator expressions (pre and post ++ and --)
///
///
///
/// UnaryMutator implements ++ and -- expressions. It derives from
/// ExpressionStatement becuase the pre/post increment/decrement
/// operators can be used in a statement context.
///
/// FIXME: Idea, we could split this up in two classes, one simpler
/// for the common case, and one with the extra fields for more complex
/// classes (indexers require temporary access; overloaded require method)
///
///
public class UnaryMutator : ExpressionStatement {
[Flags]
public enum Mode : byte {
IsIncrement = 0,
IsDecrement = 1,
IsPre = 0,
IsPost = 2,
PreIncrement = 0,
PreDecrement = IsDecrement,
PostIncrement = IsPost,
PostDecrement = IsPost | IsDecrement
}
Mode mode;
bool is_expr = false;
bool recurse = false;
Expression expr;
//
// This is expensive for the simplest case.
//
StaticCallExpr method;
public UnaryMutator (Mode m, Expression e, Location l)
{
mode = m;
loc = l;
expr = e;
}
static string OperName (Mode mode)
{
return (mode == Mode.PreIncrement || mode == Mode.PostIncrement) ?
"++" : "--";
}
///
/// 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)
///
static bool IsIncrementableNumber (Type t)
{
return (t == TypeManager.sbyte_type) ||
(t == TypeManager.byte_type) ||
(t == TypeManager.short_type) ||
(t == TypeManager.ushort_type) ||
(t == TypeManager.int32_type) ||
(t == TypeManager.uint32_type) ||
(t == TypeManager.int64_type) ||
(t == TypeManager.uint64_type) ||
(t == TypeManager.char_type) ||
(t.IsSubclassOf (TypeManager.enum_type)) ||
(t == TypeManager.float_type) ||
(t == TypeManager.double_type) ||
(t.IsPointer && t != TypeManager.void_ptr_type);
}
Expression ResolveOperator (EmitContext ec)
{
Type expr_type = expr.Type;
//
// Step 1: Perform Operator Overload location
//
Expression mg;
string op_name;
if (mode == Mode.PreIncrement || mode == Mode.PostIncrement)
op_name = "op_Increment";
else
op_name = "op_Decrement";
mg = MemberLookup (ec.ContainerType, expr_type, op_name, MemberTypes.Method, AllBindingFlags, loc);
if (mg != null) {
method = StaticCallExpr.MakeSimpleCall (
ec, (MethodGroupExpr) mg, expr, loc);
type = method.Type;
} else if (!IsIncrementableNumber (expr_type)) {
Error (187, "No such operator '" + OperName (mode) + "' defined for type '" +
TypeManager.CSharpName (expr_type) + "'");
return null;
}
//
// The operand of the prefix/postfix increment decrement operators
// should be an expression that is classified as a variable,
// a property access or an indexer access
//
type = expr_type;
if (expr.eclass == ExprClass.Variable){
LocalVariableReference var = expr as LocalVariableReference;
if ((var != null) && var.IsReadOnly) {
Error (1604, "cannot assign to `" + var.Name + "' because it is readonly");
return null;
}
} else if (expr.eclass == ExprClass.IndexerAccess || expr.eclass == ExprClass.PropertyAccess){
expr = expr.ResolveLValue (ec, this, Location);
if (expr == null)
return null;
} else {
Report.Error (1059, loc, "The operand of an increment or decrement operator must be a variable, property or indexer");
return null;
}
return this;
}
public override Expression DoResolve (EmitContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
eclass = ExprClass.Value;
#if GMCS_SOURCE
if (TypeManager.IsNullableValueType (expr.Type))
return new Nullable.LiftedUnaryMutator (mode, expr, loc).Resolve (ec);
#endif
return ResolveOperator (ec);
}
//
// Loads the proper "1" into the stack based on the type, then it emits the
// opcode for the operation requested
//
void LoadOneAndEmitOp (EmitContext ec, Type t)
{
//
// Measure if getting the typecode and using that is more/less efficient
// that comparing types. t.GetTypeCode() is an internal call.
//
ILGenerator ig = ec.ig;
if (t == TypeManager.uint64_type || t == TypeManager.int64_type)
LongConstant.EmitLong (ig, 1);
else if (t == TypeManager.double_type)
ig.Emit (OpCodes.Ldc_R8, 1.0);
else if (t == TypeManager.float_type)
ig.Emit (OpCodes.Ldc_R4, 1.0F);
else if (t.IsPointer){
Type et = TypeManager.GetElementType (t);
int n = GetTypeSize (et);
if (n == 0)
ig.Emit (OpCodes.Sizeof, et);
else
IntConstant.EmitInt (ig, n);
} else
ig.Emit (OpCodes.Ldc_I4_1);
//
// Now emit the operation
//
if (ec.CheckState){
if (t == TypeManager.int32_type ||
t == TypeManager.int64_type){
if ((mode & Mode.IsDecrement) != 0)
ig.Emit (OpCodes.Sub_Ovf);
else
ig.Emit (OpCodes.Add_Ovf);
} else if (t == TypeManager.uint32_type ||
t == TypeManager.uint64_type){
if ((mode & Mode.IsDecrement) != 0)
ig.Emit (OpCodes.Sub_Ovf_Un);
else
ig.Emit (OpCodes.Add_Ovf_Un);
} else {
if ((mode & Mode.IsDecrement) != 0)
ig.Emit (OpCodes.Sub_Ovf);
else
ig.Emit (OpCodes.Add_Ovf);
}
} else {
if ((mode & Mode.IsDecrement) != 0)
ig.Emit (OpCodes.Sub);
else
ig.Emit (OpCodes.Add);
}
if (t == TypeManager.sbyte_type){
if (ec.CheckState)
ig.Emit (OpCodes.Conv_Ovf_I1);
else
ig.Emit (OpCodes.Conv_I1);
} else if (t == TypeManager.byte_type){
if (ec.CheckState)
ig.Emit (OpCodes.Conv_Ovf_U1);
else
ig.Emit (OpCodes.Conv_U1);
} else if (t == TypeManager.short_type){
if (ec.CheckState)
ig.Emit (OpCodes.Conv_Ovf_I2);
else
ig.Emit (OpCodes.Conv_I2);
} else if (t == TypeManager.ushort_type || t == TypeManager.char_type){
if (ec.CheckState)
ig.Emit (OpCodes.Conv_Ovf_U2);
else
ig.Emit (OpCodes.Conv_U2);
}
}
void EmitCode (EmitContext ec, bool is_expr)
{
recurse = true;
this.is_expr = is_expr;
((IAssignMethod) expr).EmitAssign (ec, this, is_expr && (mode == Mode.PreIncrement || mode == Mode.PreDecrement), true);
}
public override void Emit (EmitContext ec)
{
//
// We use recurse to allow ourselfs to be the source
// of an assignment. This little hack prevents us from
// having to allocate another expression
//
if (recurse) {
((IAssignMethod) expr).Emit (ec, is_expr && (mode == Mode.PostIncrement || mode == Mode.PostDecrement));
if (method == null)
LoadOneAndEmitOp (ec, expr.Type);
else
ec.ig.Emit (OpCodes.Call, method.Method);
recurse = false;
return;
}
EmitCode (ec, true);
}
public override void EmitStatement (EmitContext ec)
{
EmitCode (ec, false);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
UnaryMutator target = (UnaryMutator) t;
target.expr = expr.Clone (clonectx);
}
}
///
/// Base class for the `Is' and `As' classes.
///
///
///
/// FIXME: Split this in two, and we get to save the `Operator' Oper
/// size.
///
public abstract class Probe : Expression {
public Expression ProbeType;
protected Expression expr;
protected TypeExpr probe_type_expr;
public Probe (Expression expr, Expression probe_type, Location l)
{
ProbeType = probe_type;
loc = l;
this.expr = expr;
}
public Expression Expr {
get {
return expr;
}
}
public override Expression DoResolve (EmitContext ec)
{
probe_type_expr = ProbeType.ResolveAsTypeTerminal (ec, false);
if (probe_type_expr == null)
return null;
expr = expr.Resolve (ec);
if (expr == null)
return null;
if (expr.Type.IsPointer || probe_type_expr.Type.IsPointer) {
Report.Error (244, loc, "The `{0}' operator cannot be applied to an operand of pointer type",
OperatorName);
return null;
}
if (expr.Type == TypeManager.anonymous_method_type) {
Report.Error (837, loc, "The `{0}' operator cannot be applied to a lambda expression or anonymous method",
OperatorName);
return null;
}
return this;
}
protected abstract string OperatorName { get; }
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Probe target = (Probe) t;
target.expr = expr.Clone (clonectx);
target.ProbeType = ProbeType.Clone (clonectx);
}
}
///
/// Implementation of the `is' operator.
///
public class Is : Probe {
public Is (Expression expr, Expression probe_type, Location l)
: base (expr, probe_type, l)
{
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
expr.Emit (ec);
ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
ig.Emit (OpCodes.Ldnull);
ig.Emit (OpCodes.Cgt_Un);
}
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
ILGenerator ig = ec.ig;
expr.Emit (ec);
ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
ig.Emit (on_true ? OpCodes.Brtrue : OpCodes.Brfalse, target);
}
Expression CreateConstantResult (bool result)
{
if (result)
Report.Warning (183, 1, loc, "The given expression is always of the provided (`{0}') type",
TypeManager.CSharpName (probe_type_expr.Type));
else
Report.Warning (184, 1, loc, "The given expression is never of the provided (`{0}') type",
TypeManager.CSharpName (probe_type_expr.Type));
return new BoolConstant (result, loc);
}
public override Expression DoResolve (EmitContext ec)
{
if (base.DoResolve (ec) == null)
return null;
Type d = expr.Type;
bool d_is_nullable = false;
if (expr is Constant) {
//
// If E is a method group or the null literal, of if the type of E is a reference
// type or a nullable type and the value of E is null, the result is false
//
if (expr.IsNull)
return CreateConstantResult (false);
} else if (TypeManager.IsNullableType (d) && !TypeManager.ContainsGenericParameters (d)) {
d = TypeManager.GetTypeArguments (d) [0];
d_is_nullable = true;
}
type = TypeManager.bool_type;
eclass = ExprClass.Value;
Type t = probe_type_expr.Type;
bool t_is_nullable = false;
if (TypeManager.IsNullableType (t) && !TypeManager.ContainsGenericParameters (t)) {
t = TypeManager.GetTypeArguments (t) [0];
t_is_nullable = true;
}
if (t.IsValueType) {
if (d == t) {
//
// D and T are the same value types but D can be null
//
if (d_is_nullable && !t_is_nullable)
return Nullable.HasValue.Create (expr, ec);
//
// The result is true if D and T are the same value types
//
return CreateConstantResult (true);
}
if (TypeManager.IsGenericParameter (d))
return ResolveGenericParameter (t, d);
//
// An unboxing conversion exists
//
if (Convert.ExplicitReferenceConversionExists (d, t))
return this;
} else {
if (TypeManager.IsGenericParameter (t))
return ResolveGenericParameter (d, t);
if (d.IsValueType) {
bool temp;
if (Convert.ImplicitBoxingConversionExists (expr, t, out temp))
return CreateConstantResult (true);
} else {
if (TypeManager.IsGenericParameter (d))
return ResolveGenericParameter (t, d);
if (TypeManager.ContainsGenericParameters (d))
return this;
if (Convert.ImplicitReferenceConversionExists (expr, t) ||
Convert.ExplicitReferenceConversionExists (d, t)) {
return this;
}
}
}
return CreateConstantResult (false);
}
Expression ResolveGenericParameter (Type d, Type t)
{
#if GMCS_SOURCE
GenericConstraints constraints = TypeManager.GetTypeParameterConstraints (t);
if (constraints != null) {
if (constraints.IsReferenceType && d.IsValueType)
return CreateConstantResult (false);
if (constraints.IsValueType && !d.IsValueType)
return CreateConstantResult (false);
}
expr = new BoxedCast (expr, d);
return this;
#else
return null;
#endif
}
protected override string OperatorName {
get { return "is"; }
}
}
///
/// Implementation of the `as' operator.
///
public class As : Probe {
public As (Expression expr, Expression probe_type, Location l)
: base (expr, probe_type, l)
{
}
bool do_isinst = false;
Expression resolved_type;
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
expr.Emit (ec);
if (do_isinst)
ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
#if GMCS_SOURCE
if (TypeManager.IsNullableType (type))
ig.Emit (OpCodes.Unbox_Any, type);
#endif
}
static void Error_CannotConvertType (Type source, Type target, Location loc)
{
Report.Error (39, loc, "Cannot convert type `{0}' to `{1}' via a built-in conversion",
TypeManager.CSharpName (source),
TypeManager.CSharpName (target));
}
public override Expression DoResolve (EmitContext ec)
{
if (resolved_type == null) {
resolved_type = base.DoResolve (ec);
if (resolved_type == null)
return null;
}
type = probe_type_expr.Type;
eclass = ExprClass.Value;
Type etype = expr.Type;
if (type.IsValueType && !TypeManager.IsNullableType (type)) {
Report.Error (77, loc, "The as operator must be used with a reference type (`" +
TypeManager.CSharpName (type) + "' is a value type)");
return null;
}
#if GMCS_SOURCE
//
// If the type is a type parameter, ensure
// that it is constrained by a class
//
TypeParameterExpr tpe = probe_type_expr as TypeParameterExpr;
if (tpe != null){
GenericConstraints constraints = tpe.TypeParameter.GenericConstraints;
bool error = false;
if (constraints == null)
error = true;
else {
if (!constraints.HasClassConstraint)
if ((constraints.Attributes & GenericParameterAttributes.ReferenceTypeConstraint) == 0)
error = true;
}
if (error){
Report.Error (413, loc,
"The as operator requires that the `{0}' type parameter be constrained by a class",
probe_type_expr.GetSignatureForError ());
return null;
}
}
#endif
if (expr.IsNull && TypeManager.IsNullableType (type)) {
Report.Warning (458, 2, loc, "The result of the expression is always `null' of type `{0}'",
TypeManager.CSharpName (type));
}
Expression e = Convert.ImplicitConversion (ec, expr, type, loc);
if (e != null){
expr = e;
do_isinst = false;
return this;
}
if (Convert.ExplicitReferenceConversionExists (etype, type)){
if (TypeManager.IsGenericParameter (etype))
expr = new BoxedCast (expr, etype);
do_isinst = true;
return this;
}
if (TypeManager.ContainsGenericParameters (etype) ||
TypeManager.ContainsGenericParameters (type)) {
expr = new BoxedCast (expr, etype);
do_isinst = true;
return this;
}
Error_CannotConvertType (etype, type, loc);
return null;
}
protected override string OperatorName {
get { return "as"; }
}
public override bool GetAttributableValue (Type value_type, out object value)
{
return expr.GetAttributableValue (value_type, out value);
}
}
///
/// This represents a typecast in the source language.
///
/// FIXME: Cast expressions have an unusual set of parsing
/// rules, we need to figure those out.
///
public class Cast : Expression {
Expression target_type;
Expression expr;
public Cast (Expression cast_type, Expression expr)
: this (cast_type, expr, cast_type.Location)
{
}
public Cast (Expression cast_type, Expression expr, Location loc)
{
this.target_type = cast_type;
this.expr = expr;
this.loc = loc;
if (target_type == TypeManager.system_void_expr)
Error_VoidInvalidInTheContext (loc);
}
public Expression TargetType {
get { return target_type; }
}
public Expression Expr {
get { return expr; }
}
public override Expression DoResolve (EmitContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
TypeExpr target = target_type.ResolveAsTypeTerminal (ec, false);
if (target == null)
return null;
type = target.Type;
if (type.IsAbstract && type.IsSealed) {
Report.Error (716, loc, "Cannot convert to static type `{0}'", TypeManager.CSharpName (type));
return null;
}
eclass = ExprClass.Value;
Constant c = expr as Constant;
if (c != null) {
c = c.TryReduce (ec, type, loc);
if (c != null)
return c;
}
if (type.IsPointer && !ec.InUnsafe) {
UnsafeError (loc);
return null;
}
expr = Convert.ExplicitConversion (ec, expr, type, loc);
return expr;
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should not happen");
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Cast target = (Cast) t;
target.target_type = target_type.Clone (clonectx);
target.expr = expr.Clone (clonectx);
}
}
//
// C# 2.0 Default value expression
//
public class DefaultValueExpression : Expression
{
Expression expr;
public DefaultValueExpression (Expression expr, Location loc)
{
this.expr = expr;
this.loc = loc;
}
public override Expression DoResolve (EmitContext ec)
{
TypeExpr texpr = expr.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
type = texpr.Type;
if (type == TypeManager.void_type) {
Error_VoidInvalidInTheContext (loc);
return null;
}
if (TypeManager.IsGenericParameter (type))
{
GenericConstraints constraints = TypeManager.GetTypeParameterConstraints(type);
if (constraints != null && constraints.IsReferenceType)
return new NullDefault (new NullLiteral (Location), type);
}
else
{
Constant c = New.Constantify(type);
if (c != null)
return new NullDefault (c, type);
if (!TypeManager.IsValueType (type))
return new NullDefault (new NullLiteral (Location), type);
}
eclass = ExprClass.Variable;
return this;
}
public override void Emit (EmitContext ec)
{
LocalTemporary temp_storage = new LocalTemporary(type);
temp_storage.AddressOf(ec, AddressOp.LoadStore);
ec.ig.Emit(OpCodes.Initobj, type);
temp_storage.Emit(ec);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
DefaultValueExpression target = (DefaultValueExpression) t;
target.expr = expr.Clone (clonectx);
}
}
///
/// Binary operators
///
public class Binary : Expression {
public enum Operator : byte {
Multiply, Division, Modulus,
Addition, Subtraction,
LeftShift, RightShift,
LessThan, GreaterThan, LessThanOrEqual, GreaterThanOrEqual,
Equality, Inequality,
BitwiseAnd,
ExclusiveOr,
BitwiseOr,
LogicalAnd,
LogicalOr,
TOP
}
readonly Operator oper;
protected Expression left, right;
readonly bool is_compound;
// This must be kept in sync with Operator!!!
public static readonly string [] oper_names;
static Binary ()
{
oper_names = new string [(int) Operator.TOP];
oper_names [(int) Operator.Multiply] = "op_Multiply";
oper_names [(int) Operator.Division] = "op_Division";
oper_names [(int) Operator.Modulus] = "op_Modulus";
oper_names [(int) Operator.Addition] = "op_Addition";
oper_names [(int) Operator.Subtraction] = "op_Subtraction";
oper_names [(int) Operator.LeftShift] = "op_LeftShift";
oper_names [(int) Operator.RightShift] = "op_RightShift";
oper_names [(int) Operator.LessThan] = "op_LessThan";
oper_names [(int) Operator.GreaterThan] = "op_GreaterThan";
oper_names [(int) Operator.LessThanOrEqual] = "op_LessThanOrEqual";
oper_names [(int) Operator.GreaterThanOrEqual] = "op_GreaterThanOrEqual";
oper_names [(int) Operator.Equality] = "op_Equality";
oper_names [(int) Operator.Inequality] = "op_Inequality";
oper_names [(int) Operator.BitwiseAnd] = "op_BitwiseAnd";
oper_names [(int) Operator.BitwiseOr] = "op_BitwiseOr";
oper_names [(int) Operator.ExclusiveOr] = "op_ExclusiveOr";
oper_names [(int) Operator.LogicalOr] = "op_LogicalOr";
oper_names [(int) Operator.LogicalAnd] = "op_LogicalAnd";
}
public Binary (Operator oper, Expression left, Expression right, bool isCompound)
: this (oper, left, right)
{
this.is_compound = isCompound;
}
public Binary (Operator oper, Expression left, Expression right)
{
this.oper = oper;
this.left = left;
this.right = right;
this.loc = left.Location;
}
public Operator Oper {
get {
return oper;
}
}
///
/// Returns a stringified representation of the Operator
///
string OperName (Operator oper)
{
string s;
switch (oper){
case Operator.Multiply:
s = "*";
break;
case Operator.Division:
s = "/";
break;
case Operator.Modulus:
s = "%";
break;
case Operator.Addition:
s = "+";
break;
case Operator.Subtraction:
s = "-";
break;
case Operator.LeftShift:
s = "<<";
break;
case Operator.RightShift:
s = ">>";
break;
case Operator.LessThan:
s = "<";
break;
case Operator.GreaterThan:
s = ">";
break;
case Operator.LessThanOrEqual:
s = "<=";
break;
case Operator.GreaterThanOrEqual:
s = ">=";
break;
case Operator.Equality:
s = "==";
break;
case Operator.Inequality:
s = "!=";
break;
case Operator.BitwiseAnd:
s = "&";
break;
case Operator.BitwiseOr:
s = "|";
break;
case Operator.ExclusiveOr:
s = "^";
break;
case Operator.LogicalOr:
s = "||";
break;
case Operator.LogicalAnd:
s = "&&";
break;
default:
s = oper.ToString ();
break;
}
if (is_compound)
return s + "=";
return s;
}
public override string ToString ()
{
return "operator " + OperName (oper) + "(" + left.ToString () + ", " +
right.ToString () + ")";
}
Expression ForceConversion (EmitContext ec, Expression expr, Type target_type)
{
if (expr.Type == target_type)
return expr;
return Convert.ImplicitConversion (ec, expr, target_type, loc);
}
void Error_OperatorAmbiguous (Location loc, Operator oper, Type l, Type r)
{
Report.Error (
34, loc, "Operator `" + OperName (oper)
+ "' is ambiguous on operands of type `"
+ TypeManager.CSharpName (l) + "' "
+ "and `" + TypeManager.CSharpName (r)
+ "'");
}
bool IsConvertible (EmitContext ec, Expression le, Expression re, Type t)
{
return Convert.ImplicitConversionExists (ec, le, t) && Convert.ImplicitConversionExists (ec, re, t);
}
bool VerifyApplicable_Predefined (EmitContext ec, Type t)
{
if (!IsConvertible (ec, left, right, t))
return false;
left = ForceConversion (ec, left, t);
right = ForceConversion (ec, right, t);
type = t;
return true;
}
bool IsApplicable_String (EmitContext ec, Expression le, Expression re, Operator oper)
{
bool l = Convert.ImplicitConversionExists (ec, le, TypeManager.string_type);
bool r = Convert.ImplicitConversionExists (ec, re, TypeManager.string_type);
if (oper == Operator.Equality || oper == Operator.Inequality)
return l && r;
if (oper == Operator.Addition)
return l || r;
return false;
}
bool OverloadResolve_PredefinedString (EmitContext ec, Operator oper)
{
if (!IsApplicable_String (ec, left, right, oper))
return false;
Type l = left.Type;
Type r = right.Type;
if (OverloadResolve_PredefinedIntegral (ec) ||
OverloadResolve_PredefinedFloating (ec)) {
Error_OperatorAmbiguous (loc, oper, l, r);
}
Type t = TypeManager.string_type;
if (Convert.ImplicitConversionExists (ec, left, t))
left = ForceConversion (ec, left, t);
if (Convert.ImplicitConversionExists (ec, right, t))
right = ForceConversion (ec, right, t);
type = t;
return true;
}
bool OverloadResolve_PredefinedIntegral (EmitContext ec)
{
return VerifyApplicable_Predefined (ec, TypeManager.int32_type) ||
VerifyApplicable_Predefined (ec, TypeManager.uint32_type) ||
VerifyApplicable_Predefined (ec, TypeManager.int64_type) ||
VerifyApplicable_Predefined (ec, TypeManager.uint64_type) ||
false;
}
bool OverloadResolve_PredefinedFloating (EmitContext ec)
{
return VerifyApplicable_Predefined (ec, TypeManager.float_type) ||
VerifyApplicable_Predefined (ec, TypeManager.double_type) ||
false;
}
static public void Error_OperatorCannotBeApplied (Location loc, string name, Type l, Type r)
{
Error_OperatorCannotBeApplied (loc, name, TypeManager.CSharpName (l), TypeManager.CSharpName (r));
}
public static void Error_OperatorCannotBeApplied (Location loc, string name, string left, string right)
{
Report.Error (19, loc, "Operator `{0}' cannot be applied to operands of type `{1}' and `{2}'",
name, left, right);
}
protected void Error_OperatorCannotBeApplied ()
{
Error_OperatorCannotBeApplied (Location, OperName (oper), TypeManager.CSharpName (left.Type),
TypeManager.CSharpName(right.Type));
}
static bool IsUnsigned (Type t)
{
if (t.IsPointer)
return IsUnsigned (t.GetElementType ());
return (t == TypeManager.uint32_type || t == TypeManager.uint64_type ||
t == TypeManager.short_type || t == TypeManager.byte_type);
}
Expression Make32or64 (EmitContext ec, Expression e)
{
Type t= e.Type;
if (t == TypeManager.int32_type || t == TypeManager.uint32_type ||
t == TypeManager.int64_type || t == TypeManager.uint64_type)
return e;
Expression ee = Convert.ImplicitConversion (ec, e, TypeManager.int32_type, loc);
if (ee != null)
return ee;
ee = Convert.ImplicitConversion (ec, e, TypeManager.uint32_type, loc);
if (ee != null)
return ee;
ee = Convert.ImplicitConversion (ec, e, TypeManager.int64_type, loc);
if (ee != null)
return ee;
ee = Convert.ImplicitConversion (ec, e, TypeManager.uint64_type, loc);
if (ee != null)
return ee;
return null;
}
Expression CheckShiftArguments (EmitContext ec)
{
Expression new_left = Make32or64 (ec, left);
Expression new_right = ForceConversion (ec, right, TypeManager.int32_type);
if (new_left == null || new_right == null) {
Error_OperatorCannotBeApplied ();
return null;
}
type = new_left.Type;
int shiftmask = (type == TypeManager.int32_type || type == TypeManager.uint32_type) ? 31 : 63;
left = new_left;
right = new Binary (Binary.Operator.BitwiseAnd, new_right, new IntConstant (shiftmask, loc)).DoResolve (ec);
return this;
}
//
// This is used to check if a test 'x == null' can be optimized to a reference equals,
// i.e., not invoke op_Equality.
//
static bool EqualsNullIsReferenceEquals (Type t)
{
return t == TypeManager.object_type || t == TypeManager.string_type ||
t == TypeManager.delegate_type || t.IsSubclassOf (TypeManager.delegate_type);
}
static void Warning_UnintendedReferenceComparison (Location loc, string side, Type type)
{
Report.Warning ((side == "left" ? 252 : 253), 2, loc,
"Possible unintended reference comparison; to get a value comparison, " +
"cast the {0} hand side to type `{1}'.", side, TypeManager.CSharpName (type));
}
static void Warning_Constant_Result (Location loc, bool result, Type type)
{
Report.Warning (472, 2, loc, "The result of comparing `{0}' against null is always `{1}'. " +
"This operation is undocumented and it is temporary supported for compatibility reasons only",
TypeManager.CSharpName (type), result ? "true" : "false");
}
Expression ResolveOperator (EmitContext ec)
{
Type l = left.Type;
Type r = right.Type;
if (oper == Operator.Equality || oper == Operator.Inequality){
if (right.Type == TypeManager.null_type){
if (TypeManager.IsGenericParameter (l)){
if (l.BaseType == TypeManager.value_type) {
Error_OperatorCannotBeApplied ();
return null;
}
left = new BoxedCast (left, TypeManager.object_type);
Type = TypeManager.bool_type;
return this;
}
//
// 7.9.9 Equality operators and null
//
// CSC 2 has this behavior, it allows structs to be compared
// with the null literal *outside* of a generics context and
// inlines that as true or false.
//
// This is, in my opinion, completely wrong.
//
if (RootContext.Version != LanguageVersion.ISO_1 && l.IsValueType) {
if (!TypeManager.IsPrimitiveType (l) && !TypeManager.IsEnumType (l)) {
if (MemberLookup (ec.ContainerType, l, oper_names [(int)Operator.Equality], MemberTypes.Method, AllBindingFlags, loc) == null &&
MemberLookup (ec.ContainerType, l, oper_names [(int)Operator.Inequality], MemberTypes.Method, AllBindingFlags, loc) == null) {
Error_OperatorCannotBeApplied ();
return null;
}
}
Warning_Constant_Result (loc, oper == Operator.Inequality, l);
return new BoolConstant (oper == Operator.Inequality, loc);
}
}
if (left is NullLiteral){
if (TypeManager.IsGenericParameter (r)){
if (r.BaseType == TypeManager.value_type) {
Error_OperatorCannotBeApplied ();
return null;
}
right = new BoxedCast (right, TypeManager.object_type);
Type = TypeManager.bool_type;
return this;
}
//
// 7.9.9 Equality operators and null
//
// CSC 2 has this behavior, it allows structs to be compared
// with the null literal *outside* of a generics context and
// inlines that as true or false.
//
// This is, in my opinion, completely wrong.
//
if (RootContext.Version != LanguageVersion.ISO_1 && r.IsValueType){
if (!TypeManager.IsPrimitiveType (r) && !TypeManager.IsEnumType (r)) {
if (MemberLookup (ec.ContainerType, r, oper_names [(int) Operator.Equality], MemberTypes.Method, AllBindingFlags, loc) == null &&
MemberLookup (ec.ContainerType, r, oper_names [(int) Operator.Inequality], MemberTypes.Method, AllBindingFlags, loc) == null) {
Error_OperatorCannotBeApplied ();
return null;
}
}
Warning_Constant_Result (loc, oper == Operator.Inequality, r);
return new BoolConstant (oper == Operator.Inequality, loc);
}
}
//
// Optimize out call to op_Equality in a few cases.
//
if ((l == TypeManager.null_type && EqualsNullIsReferenceEquals (r)) ||
(r == TypeManager.null_type && EqualsNullIsReferenceEquals (l))) {
Type = TypeManager.bool_type;
return this;
}
// IntPtr equality
if (l == TypeManager.intptr_type && r == TypeManager.intptr_type) {
Type = TypeManager.bool_type;
return this;
}
#if GMCS_SOURCE
//
// Delegate equality
//
MethodGroupExpr mg = null;
Type delegate_type = null;
if (left.eclass == ExprClass.MethodGroup) {
if (!TypeManager.IsDelegateType(r)) {
Error_OperatorCannotBeApplied(Location, OperName(oper),
left.ExprClassName, right.ExprClassName);
return null;
}
mg = (MethodGroupExpr)left;
delegate_type = r;
} else if (right.eclass == ExprClass.MethodGroup) {
if (!TypeManager.IsDelegateType(l)) {
Error_OperatorCannotBeApplied(Location, OperName(oper),
left.ExprClassName, right.ExprClassName);
return null;
}
mg = (MethodGroupExpr)right;
delegate_type = l;
}
if (mg != null) {
Expression e = ImplicitDelegateCreation.Create (ec, mg, delegate_type, loc);
if (e == null)
return null;
// Find operator method
string op = oper_names[(int)oper];
MemberInfo[] mi = TypeManager.MemberLookup(ec.ContainerType, null,
TypeManager.delegate_type, MemberTypes.Method, AllBindingFlags, op, null);
ArrayList args = new ArrayList(2);
args.Add(new Argument(e, Argument.AType.Expression));
if (delegate_type == l)
args.Insert(0, new Argument(left, Argument.AType.Expression));
else
args.Add(new Argument(right, Argument.AType.Expression));
return new BinaryMethod (TypeManager.bool_type, (MethodInfo)mi [0], args);
}
#endif
if (l == TypeManager.anonymous_method_type || r == TypeManager.anonymous_method_type) {
Error_OperatorCannotBeApplied(Location, OperName(oper),
left.ExprClassName, right.ExprClassName);
return null;
}
}
//
// Do not perform operator overload resolution when both sides are
// built-in types
//
MethodGroupExpr left_operators = null, right_operators = null;
if (!(TypeManager.IsPrimitiveType (l) && TypeManager.IsPrimitiveType (r))) {
//
// Step 1: Perform Operator Overload location
//
string op = oper_names [(int) oper];
MethodGroupExpr union;
left_operators = MemberLookup (ec.ContainerType, l, op, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
if (r != l){
right_operators = MemberLookup (
ec.ContainerType, r, op, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
union = MethodGroupExpr.MakeUnionSet (left_operators, right_operators, loc);
} else
union = left_operators;
if (union != null) {
ArrayList args = new ArrayList (2);
args.Add (new Argument (left, Argument.AType.Expression));
args.Add (new Argument (right, Argument.AType.Expression));
union = union.OverloadResolve (ec, ref args, true, Location.Null);
if (union != null) {
MethodInfo mi = (MethodInfo) union;
return new BinaryMethod (mi.ReturnType, mi, args);
}
}
}
//
// String concatenation
//
// string operator + (string x, string y);
// string operator + (string x, object y);
// string operator + (object x, string y);
//
if (oper == Operator.Addition && !TypeManager.IsDelegateType (l)) {
//
// Either left or right expression is implicitly convertible to string
//
if (OverloadResolve_PredefinedString (ec, oper)) {
if (r == TypeManager.void_type || l == TypeManager.void_type) {
Error_OperatorCannotBeApplied ();
return null;
}
//
// Constants folding for strings and nulls
//
if (left.Type == TypeManager.string_type && right.Type == TypeManager.string_type &&
left is Constant && right is Constant) {
string lvalue = (string)((Constant) left).GetValue ();
string rvalue = (string)((Constant) right).GetValue ();
return new StringConstant (lvalue + rvalue, left.Location);
}
//
// Append to existing string concatenation
//
if (left is StringConcat) {
((StringConcat) left).Append (ec, right);
return left;
}
//
// Otherwise, start a new concat expression using converted expression
//
return new StringConcat (ec, loc, left, right).Resolve (ec);
}
//
// Transform a + ( - b) into a - b
//
if (right is Unary){
Unary right_unary = (Unary) right;
if (right_unary.Oper == Unary.Operator.UnaryNegation){
return new Binary (Operator.Subtraction, left, right_unary.Expr).Resolve (ec);
}
}
}
if (oper == Operator.Equality || oper == Operator.Inequality){
if (l == TypeManager.bool_type || r == TypeManager.bool_type){
if (r != TypeManager.bool_type || l != TypeManager.bool_type){
Error_OperatorCannotBeApplied ();
return null;
}
type = TypeManager.bool_type;
return this;
}
if (l.IsPointer || r.IsPointer) {
if (l.IsPointer && r.IsPointer) {
type = TypeManager.bool_type;
return this;
}
if (l.IsPointer && r == TypeManager.null_type) {
right = new EmptyConstantCast (NullPointer.Null, l);
type = TypeManager.bool_type;
return this;
}
if (r.IsPointer && l == TypeManager.null_type) {
left = new EmptyConstantCast (NullPointer.Null, r);
type = TypeManager.bool_type;
return this;
}
}
#if GMCS_SOURCE
if (l.IsGenericParameter && r.IsGenericParameter) {
GenericConstraints l_gc, r_gc;
l_gc = TypeManager.GetTypeParameterConstraints (l);
r_gc = TypeManager.GetTypeParameterConstraints (r);
if ((l_gc == null) || (r_gc == null) ||
!(l_gc.HasReferenceTypeConstraint || l_gc.HasClassConstraint) ||
!(r_gc.HasReferenceTypeConstraint || r_gc.HasClassConstraint)) {
Error_OperatorCannotBeApplied ();
return null;
}
}
#endif
//
// operator != (object a, object b)
// operator == (object a, object b)
//
// For this to be used, both arguments have to be reference-types.
// Read the rationale on the spec (14.9.6)
//
if (!(l.IsValueType || r.IsValueType)){
type = TypeManager.bool_type;
if (l == r)
return this;
//
// Also, a standard conversion must exist from either one
//
// NOTE: An interface is converted to the object before the
// standard conversion is applied. It's not clear from the
// standard but it looks like it works like that.
//
if (l.IsInterface)
l = TypeManager.object_type;
if (r.IsInterface)
r = TypeManager.object_type;
bool left_to_right =
Convert.ImplicitStandardConversionExists (left, r);
bool right_to_left = !left_to_right &&
Convert.ImplicitStandardConversionExists (right, l);
if (!left_to_right && !right_to_left) {
Error_OperatorCannotBeApplied ();
return null;
}
if (left_to_right && left_operators != null &&
Report.WarningLevel >= 2) {
ArrayList args = new ArrayList (2);
args.Add (new Argument (left, Argument.AType.Expression));
args.Add (new Argument (left, Argument.AType.Expression));
if (left_operators.OverloadResolve (ec, ref args, true, Location.Null) != null)
Warning_UnintendedReferenceComparison (loc, "right", l);
}
if (right_to_left && right_operators != null &&
Report.WarningLevel >= 2) {
ArrayList args = new ArrayList (2);
args.Add (new Argument (right, Argument.AType.Expression));
args.Add (new Argument (right, Argument.AType.Expression));
if (right_operators.OverloadResolve (ec, ref args, true, Location.Null) != null)
Warning_UnintendedReferenceComparison (loc, "left", r);
}
//
// We are going to have to convert to an object to compare
//
if (l != TypeManager.object_type)
left = EmptyCast.Create (left, TypeManager.object_type);
if (r != TypeManager.object_type)
right = EmptyCast.Create (right, TypeManager.object_type);
return this;
}
}
// Only perform numeric promotions on:
// +, -, *, /, %, &, |, ^, ==, !=, <, >, <=, >=
//
if (oper == Operator.Addition || oper == Operator.Subtraction) {
if (TypeManager.IsDelegateType (l)){
if (((right.eclass == ExprClass.MethodGroup) ||
(r == TypeManager.anonymous_method_type))){
if ((RootContext.Version != LanguageVersion.ISO_1)){
Expression tmp = Convert.ImplicitConversionRequired (ec, right, l, loc);
if (tmp == null)
return null;
right = tmp;
r = right.Type;
}
}
if (TypeManager.IsDelegateType (r) || right is NullLiteral){
MethodInfo method;
ArrayList args = new ArrayList (2);
args = new ArrayList (2);
args.Add (new Argument (left, Argument.AType.Expression));
args.Add (new Argument (right, Argument.AType.Expression));
if (oper == Operator.Addition)
method = TypeManager.delegate_combine_delegate_delegate;
else
method = TypeManager.delegate_remove_delegate_delegate;
if (!TypeManager.IsEqual (l, r) && !(right is NullLiteral)) {
Error_OperatorCannotBeApplied ();
return null;
}
return new BinaryDelegate (l, method, args);
}
}
//
// Pointer arithmetic:
//
// T* operator + (T* x, int y);
// T* operator + (T* x, uint y);
// T* operator + (T* x, long y);
// T* operator + (T* x, ulong y);
//
// T* operator + (int y, T* x);
// T* operator + (uint y, T *x);
// T* operator + (long y, T *x);
// T* operator + (ulong y, T *x);
//
// T* operator - (T* x, int y);
// T* operator - (T* x, uint y);
// T* operator - (T* x, long y);
// T* operator - (T* x, ulong y);
//
// long operator - (T* x, T *y)
//
if (l.IsPointer){
if (r.IsPointer && oper == Operator.Subtraction){
if (r == l)
return new PointerArithmetic (
false, left, right, TypeManager.int64_type,
loc).Resolve (ec);
} else {
Expression t = Make32or64 (ec, right);
if (t != null)
return new PointerArithmetic (oper == Operator.Addition, left, t, l, loc).Resolve (ec);
}
} else if (r.IsPointer && oper == Operator.Addition){
Expression t = Make32or64 (ec, left);
if (t != null)
return new PointerArithmetic (true, right, t, r, loc).Resolve (ec);
}
}
//
// Enumeration operators
//
bool lie = TypeManager.IsEnumType (l);
bool rie = TypeManager.IsEnumType (r);
if (lie || rie){
Expression temp;
// U operator - (E e, E f)
if (lie && rie){
if (oper == Operator.Subtraction){
if (l == r){
type = TypeManager.EnumToUnderlying (l);
return this;
}
Error_OperatorCannotBeApplied ();
return null;
}
}
//
// operator + (E e, U x)
// operator - (E e, U x)
//
if (oper == Operator.Addition || oper == Operator.Subtraction){
Type enum_type = lie ? l : r;
Type other_type = lie ? r : l;
Type underlying_type = TypeManager.EnumToUnderlying (enum_type);
if (underlying_type != other_type){
temp = Convert.ImplicitConversion (ec, lie ? right : left, underlying_type, loc);
if (temp != null){
if (lie)
right = temp;
else
left = temp;
type = enum_type;
return this;
}
Error_OperatorCannotBeApplied ();
return null;
}
type = enum_type;
return this;
}
if (!rie){
temp = Convert.ImplicitConversion (ec, right, l, loc);
if (temp != null)
right = temp;
else {
Error_OperatorCannotBeApplied ();
return null;
}
} if (!lie){
temp = Convert.ImplicitConversion (ec, left, r, loc);
if (temp != null){
left = temp;
l = r;
} else {
Error_OperatorCannotBeApplied ();
return null;
}
}
if (oper == Operator.Equality || oper == Operator.Inequality ||
oper == Operator.LessThanOrEqual || oper == Operator.LessThan ||
oper == Operator.GreaterThanOrEqual || oper == Operator.GreaterThan){
if (left.Type != right.Type){
Error_OperatorCannotBeApplied ();
return null;
}
type = TypeManager.bool_type;
return this;
}
if (oper == Operator.BitwiseAnd ||
oper == Operator.BitwiseOr ||
oper == Operator.ExclusiveOr){
if (left.Type != right.Type){
Error_OperatorCannotBeApplied ();
return null;
}
type = l;
return this;
}
Error_OperatorCannotBeApplied ();
return null;
}
if (oper == Operator.LeftShift || oper == Operator.RightShift)
return CheckShiftArguments (ec);
if (oper == Operator.LogicalOr || oper == Operator.LogicalAnd){
if (l == TypeManager.bool_type && r == TypeManager.bool_type) {
type = TypeManager.bool_type;
return this;
}
Expression left_operators_e = l == TypeManager.bool_type ?
left : Convert.ImplicitUserConversion (ec, left, TypeManager.bool_type, loc);
Expression right_operators_e = r == TypeManager.bool_type ?
right : Convert.ImplicitUserConversion (ec, right, TypeManager.bool_type, loc);
if (left_operators_e != null && right_operators_e != null) {
left = left_operators_e;
right = right_operators_e;
type = TypeManager.bool_type;
return this;
}
Expression e = new ConditionalLogicalOperator (
oper == Operator.LogicalAnd, left, right, l, loc);
return e.Resolve (ec);
}
Expression orig_left = left;
Expression orig_right = right;
//
// operator & (bool x, bool y)
// operator | (bool x, bool y)
// operator ^ (bool x, bool y)
//
if (oper == Operator.BitwiseAnd ||
oper == Operator.BitwiseOr ||
oper == Operator.ExclusiveOr) {
if (OverloadResolve_PredefinedIntegral (ec)) {
if (IsConvertible (ec, orig_left, orig_right, TypeManager.bool_type)) {
Error_OperatorAmbiguous (loc, oper, l, r);
return null;
}
if (oper == Operator.BitwiseOr && l != r && !(orig_right is Constant) && right is OpcodeCast &&
(r == TypeManager.sbyte_type || r == TypeManager.short_type ||
r == TypeManager.int32_type || r == TypeManager.int64_type)) {
Report.Warning (675, 3, loc, "The operator `|' used on the sign-extended type `{0}'. Consider casting to a smaller unsigned type first",
TypeManager.CSharpName (r));
}
} else if (!VerifyApplicable_Predefined (ec, TypeManager.bool_type)) {
Error_OperatorCannotBeApplied ();
return null;
}
return this;
}
//
// Pointer comparison
//
if (l.IsPointer && r.IsPointer){
if (oper == Operator.LessThan || oper == Operator.LessThanOrEqual ||
oper == Operator.GreaterThan || oper == Operator.GreaterThanOrEqual){
type = TypeManager.bool_type;
return this;
}
}
if (OverloadResolve_PredefinedIntegral (ec)) {
if (IsApplicable_String (ec, orig_left, orig_right, oper)) {
Error_OperatorAmbiguous (loc, oper, l, r);
return null;
}
} else if (OverloadResolve_PredefinedFloating (ec)) {
if (IsConvertible (ec, orig_left, orig_right, TypeManager.decimal_type) ||
IsApplicable_String (ec, orig_left, orig_right, oper)) {
Error_OperatorAmbiguous (loc, oper, l, r);
return null;
}
} else if (VerifyApplicable_Predefined (ec, TypeManager.decimal_type)) {
if (IsApplicable_String (ec, orig_left, orig_right, oper)) {
Error_OperatorAmbiguous (loc, oper, l, r);
return null;
}
} else if (!OverloadResolve_PredefinedString (ec, oper)) {
Error_OperatorCannotBeApplied ();
return null;
}
if (oper == Operator.Equality ||
oper == Operator.Inequality ||
oper == Operator.LessThanOrEqual ||
oper == Operator.LessThan ||
oper == Operator.GreaterThanOrEqual ||
oper == Operator.GreaterThan)
type = TypeManager.bool_type;
l = left.Type;
r = right.Type;
if (l == TypeManager.decimal_type || l == TypeManager.string_type || r == TypeManager.string_type) {
Type lookup = l;
if (r == TypeManager.string_type)
lookup = r;
MethodGroupExpr ops = (MethodGroupExpr) MemberLookup (
ec.ContainerType, lookup, oper_names [(int) oper],
MemberTypes.Method, AllBindingFlags, loc);
ArrayList args = new ArrayList (2);
args.Add (new Argument (left, Argument.AType.Expression));
args.Add (new Argument (right, Argument.AType.Expression));
ops = ops.OverloadResolve (ec, ref args, true, Location.Null);
return new BinaryMethod (type, (MethodInfo)ops, args);
}
return this;
}
Constant EnumLiftUp (Constant left, Constant right)
{
switch (oper) {
case Operator.BitwiseOr:
case Operator.BitwiseAnd:
case Operator.ExclusiveOr:
case Operator.Equality:
case Operator.Inequality:
case Operator.LessThan:
case Operator.LessThanOrEqual:
case Operator.GreaterThan:
case Operator.GreaterThanOrEqual:
if (left is EnumConstant)
return left;
if (left.IsZeroInteger)
return new EnumConstant (left, right.Type);
break;
case Operator.Addition:
case Operator.Subtraction:
return left;
case Operator.Multiply:
case Operator.Division:
case Operator.Modulus:
case Operator.LeftShift:
case Operator.RightShift:
if (right is EnumConstant || left is EnumConstant)
break;
return left;
}
Error_OperatorCannotBeApplied ();
return null;
}
public override Expression DoResolve (EmitContext ec)
{
if (left == null)
return null;
if ((oper == Operator.Subtraction) && (left is ParenthesizedExpression)) {
left = ((ParenthesizedExpression) left).Expr;
left = left.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.Type);
if (left == null)
return null;
if (left.eclass == ExprClass.Type) {
Report.Error (75, loc, "To cast a negative value, you must enclose the value in parentheses");
return null;
}
} else
left = left.Resolve (ec);
if (left == null)
return null;
Constant lc = left as Constant;
if (lc != null && lc.Type == TypeManager.bool_type &&
((oper == Operator.LogicalAnd && (bool)lc.GetValue () == false) ||
(oper == Operator.LogicalOr && (bool)lc.GetValue () == true))) {
// TODO: make a sense to resolve unreachable expression as we do for statement
Report.Warning (429, 4, loc, "Unreachable expression code detected");
return left;
}
right = right.Resolve (ec);
if (right == null)
return null;
eclass = ExprClass.Value;
Constant rc = right as Constant;
// The conversion rules are ignored in enum context but why
if (!ec.InEnumContext && lc != null && rc != null && (TypeManager.IsEnumType (left.Type) || TypeManager.IsEnumType (right.Type))) {
left = lc = EnumLiftUp (lc, rc);
if (lc == null)
return null;
right = rc = EnumLiftUp (rc, lc);
if (rc == null)
return null;
}
if (oper == Operator.BitwiseAnd) {
if (rc != null && rc.IsZeroInteger) {
return lc is EnumConstant ?
new EnumConstant (rc, lc.Type):
rc;
}
if (lc != null && lc.IsZeroInteger) {
return rc is EnumConstant ?
new EnumConstant (lc, rc.Type):
lc;
}
}
else if (oper == Operator.BitwiseOr) {
if (lc is EnumConstant &&
rc != null && rc.IsZeroInteger)
return lc;
if (rc is EnumConstant &&
lc != null && lc.IsZeroInteger)
return rc;
} else if (oper == Operator.LogicalAnd) {
if (rc != null && rc.IsDefaultValue && rc.Type == TypeManager.bool_type)
return rc;
if (lc != null && lc.IsDefaultValue && lc.Type == TypeManager.bool_type)
return lc;
}
if (rc != null && lc != null){
int prev_e = Report.Errors;
Expression e = ConstantFold.BinaryFold (
ec, oper, lc, rc, loc);
if (e != null || Report.Errors != prev_e)
return e;
}
#if GMCS_SOURCE
if ((left is NullLiteral || left.Type.IsValueType) &&
(right is NullLiteral || right.Type.IsValueType) &&
!(left is NullLiteral && right is NullLiteral) &&
(TypeManager.IsNullableType (left.Type) || TypeManager.IsNullableType (right.Type)))
return new Nullable.LiftedBinaryOperator (oper, left, right, loc).Resolve (ec);
#endif
// Comparison warnings
if (oper == Operator.Equality || oper == Operator.Inequality ||
oper == Operator.LessThanOrEqual || oper == Operator.LessThan ||
oper == Operator.GreaterThanOrEqual || oper == Operator.GreaterThan){
if (left.Equals (right)) {
Report.Warning (1718, 3, loc, "A comparison made to same variable. Did you mean to compare something else?");
}
CheckUselessComparison (lc, right.Type);
CheckUselessComparison (rc, left.Type);
}
return ResolveOperator (ec);
}
public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
{
return null;
}
private void CheckUselessComparison (Constant c, Type type)
{
if (c == null || !IsTypeIntegral (type)
|| c is StringConstant
|| c is BoolConstant
|| c is FloatConstant
|| c is DoubleConstant
|| c is DecimalConstant
)
return;
long value = 0;
if (c is ULongConstant) {
ulong uvalue = ((ULongConstant) c).Value;
if (uvalue > long.MaxValue) {
if (type == TypeManager.byte_type ||
type == TypeManager.sbyte_type ||
type == TypeManager.short_type ||
type == TypeManager.ushort_type ||
type == TypeManager.int32_type ||
type == TypeManager.uint32_type ||
type == TypeManager.int64_type ||
type == TypeManager.char_type)
WarnUselessComparison (type);
return;
}
value = (long) uvalue;
}
else if (c is ByteConstant)
value = ((ByteConstant) c).Value;
else if (c is SByteConstant)
value = ((SByteConstant) c).Value;
else if (c is ShortConstant)
value = ((ShortConstant) c).Value;
else if (c is UShortConstant)
value = ((UShortConstant) c).Value;
else if (c is IntConstant)
value = ((IntConstant) c).Value;
else if (c is UIntConstant)
value = ((UIntConstant) c).Value;
else if (c is LongConstant)
value = ((LongConstant) c).Value;
else if (c is CharConstant)
value = ((CharConstant)c).Value;
if (value == 0)
return;
if (IsValueOutOfRange (value, type))
WarnUselessComparison (type);
}
private bool IsValueOutOfRange (long value, Type type)
{
if (IsTypeUnsigned (type) && value < 0)
return true;
return type == TypeManager.sbyte_type && (value >= 0x80 || value < -0x80) ||
type == TypeManager.byte_type && value >= 0x100 ||
type == TypeManager.short_type && (value >= 0x8000 || value < -0x8000) ||
type == TypeManager.ushort_type && value >= 0x10000 ||
type == TypeManager.int32_type && (value >= 0x80000000 || value < -0x80000000) ||
type == TypeManager.uint32_type && value >= 0x100000000;
}
private static bool IsTypeIntegral (Type type)
{
return type == TypeManager.uint64_type ||
type == TypeManager.int64_type ||
type == TypeManager.uint32_type ||
type == TypeManager.int32_type ||
type == TypeManager.ushort_type ||
type == TypeManager.short_type ||
type == TypeManager.sbyte_type ||
type == TypeManager.byte_type ||
type == TypeManager.char_type;
}
private static bool IsTypeUnsigned (Type type)
{
return type == TypeManager.uint64_type ||
type == TypeManager.uint32_type ||
type == TypeManager.ushort_type ||
type == TypeManager.byte_type ||
type == TypeManager.char_type;
}
private void WarnUselessComparison (Type type)
{
Report.Warning (652, 2, loc, "A comparison between a constant and a variable is useless. The constant is out of the range of the variable type `{0}'",
TypeManager.CSharpName (type));
}
///
/// EmitBranchable is called from Statement.EmitBoolExpression in the
/// context of a conditional bool expression. This function will return
/// false if it is was possible to use EmitBranchable, or true if it was.
///
/// The expression's code is generated, and we will generate a branch to `target'
/// if the resulting expression value is equal to isTrue
///
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
ILGenerator ig = ec.ig;
//
// This is more complicated than it looks, but its just to avoid
// duplicated tests: basically, we allow ==, !=, >, <, >= and <=
// but on top of that we want for == and != to use a special path
// if we are comparing against null
//
if ((oper == Operator.Equality || oper == Operator.Inequality) && (left is Constant || right is Constant)) {
bool my_on_true = oper == Operator.Inequality ? on_true : !on_true;
//
// put the constant on the rhs, for simplicity
//
if (left is Constant) {
Expression swap = right;
right = left;
left = swap;
}
if (((Constant) right).IsZeroInteger) {
left.Emit (ec);
if (my_on_true)
ig.Emit (OpCodes.Brtrue, target);
else
ig.Emit (OpCodes.Brfalse, target);
return;
} else if (right is BoolConstant) {
left.Emit (ec);
if (my_on_true != ((BoolConstant) right).Value)
ig.Emit (OpCodes.Brtrue, target);
else
ig.Emit (OpCodes.Brfalse, target);
return;
}
} else if (oper == Operator.LogicalAnd) {
if (on_true) {
Label tests_end = ig.DefineLabel ();
left.EmitBranchable (ec, tests_end, false);
right.EmitBranchable (ec, target, true);
ig.MarkLabel (tests_end);
} else {
//
// This optimizes code like this
// if (true && i > 4)
//
if (!(left is Constant))
left.EmitBranchable (ec, target, false);
if (!(right is Constant))
right.EmitBranchable (ec, target, false);
}
return;
} else if (oper == Operator.LogicalOr){
if (on_true) {
left.EmitBranchable (ec, target, true);
right.EmitBranchable (ec, target, true);
} else {
Label tests_end = ig.DefineLabel ();
left.EmitBranchable (ec, tests_end, true);
right.EmitBranchable (ec, target, false);
ig.MarkLabel (tests_end);
}
return;
} else if (!(oper == Operator.LessThan || oper == Operator.GreaterThan ||
oper == Operator.LessThanOrEqual || oper == Operator.GreaterThanOrEqual ||
oper == Operator.Equality || oper == Operator.Inequality)) {
base.EmitBranchable (ec, target, on_true);
return;
}
left.Emit (ec);
right.Emit (ec);
Type t = left.Type;
bool is_unsigned = IsUnsigned (t) || t == TypeManager.double_type || t == TypeManager.float_type;
switch (oper){
case Operator.Equality:
if (on_true)
ig.Emit (OpCodes.Beq, target);
else
ig.Emit (OpCodes.Bne_Un, target);
break;
case Operator.Inequality:
if (on_true)
ig.Emit (OpCodes.Bne_Un, target);
else
ig.Emit (OpCodes.Beq, target);
break;
case Operator.LessThan:
if (on_true)
if (is_unsigned)
ig.Emit (OpCodes.Blt_Un, target);
else
ig.Emit (OpCodes.Blt, target);
else
if (is_unsigned)
ig.Emit (OpCodes.Bge_Un, target);
else
ig.Emit (OpCodes.Bge, target);
break;
case Operator.GreaterThan:
if (on_true)
if (is_unsigned)
ig.Emit (OpCodes.Bgt_Un, target);
else
ig.Emit (OpCodes.Bgt, target);
else
if (is_unsigned)
ig.Emit (OpCodes.Ble_Un, target);
else
ig.Emit (OpCodes.Ble, target);
break;
case Operator.LessThanOrEqual:
if (on_true)
if (is_unsigned)
ig.Emit (OpCodes.Ble_Un, target);
else
ig.Emit (OpCodes.Ble, target);
else
if (is_unsigned)
ig.Emit (OpCodes.Bgt_Un, target);
else
ig.Emit (OpCodes.Bgt, target);
break;
case Operator.GreaterThanOrEqual:
if (on_true)
if (is_unsigned)
ig.Emit (OpCodes.Bge_Un, target);
else
ig.Emit (OpCodes.Bge, target);
else
if (is_unsigned)
ig.Emit (OpCodes.Blt_Un, target);
else
ig.Emit (OpCodes.Blt, target);
break;
default:
Console.WriteLine (oper);
throw new Exception ("what is THAT");
}
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Type l = left.Type;
OpCode opcode;
//
// Handle short-circuit operators differently
// than the rest
//
if (oper == Operator.LogicalAnd) {
Label load_zero = ig.DefineLabel ();
Label end = ig.DefineLabel ();
left.EmitBranchable (ec, load_zero, false);
right.Emit (ec);
ig.Emit (OpCodes.Br, end);
ig.MarkLabel (load_zero);
ig.Emit (OpCodes.Ldc_I4_0);
ig.MarkLabel (end);
return;
} else if (oper == Operator.LogicalOr) {
Label load_one = ig.DefineLabel ();
Label end = ig.DefineLabel ();
left.EmitBranchable (ec, load_one, true);
right.Emit (ec);
ig.Emit (OpCodes.Br, end);
ig.MarkLabel (load_one);
ig.Emit (OpCodes.Ldc_I4_1);
ig.MarkLabel (end);
return;
}
left.Emit (ec);
right.Emit (ec);
bool is_unsigned = IsUnsigned (left.Type);
switch (oper){
case Operator.Multiply:
if (ec.CheckState){
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Mul_Ovf;
else if (is_unsigned)
opcode = OpCodes.Mul_Ovf_Un;
else
opcode = OpCodes.Mul;
} else
opcode = OpCodes.Mul;
break;
case Operator.Division:
if (is_unsigned)
opcode = OpCodes.Div_Un;
else
opcode = OpCodes.Div;
break;
case Operator.Modulus:
if (is_unsigned)
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 (is_unsigned)
opcode = OpCodes.Add_Ovf_Un;
else
opcode = OpCodes.Add;
} else
opcode = OpCodes.Add;
break;
case Operator.Subtraction:
if (ec.CheckState){
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Sub_Ovf;
else if (is_unsigned)
opcode = OpCodes.Sub_Ovf_Un;
else
opcode = OpCodes.Sub;
} else
opcode = OpCodes.Sub;
break;
case Operator.RightShift:
if (is_unsigned)
opcode = OpCodes.Shr_Un;
else
opcode = OpCodes.Shr;
break;
case Operator.LeftShift:
opcode = OpCodes.Shl;
break;
case Operator.Equality:
opcode = OpCodes.Ceq;
break;
case Operator.Inequality:
ig.Emit (OpCodes.Ceq);
ig.Emit (OpCodes.Ldc_I4_0);
opcode = OpCodes.Ceq;
break;
case Operator.LessThan:
if (is_unsigned)
opcode = OpCodes.Clt_Un;
else
opcode = OpCodes.Clt;
break;
case Operator.GreaterThan:
if (is_unsigned)
opcode = OpCodes.Cgt_Un;
else
opcode = OpCodes.Cgt;
break;
case Operator.LessThanOrEqual:
Type lt = left.Type;
if (is_unsigned || (lt == TypeManager.double_type || lt == TypeManager.float_type))
ig.Emit (OpCodes.Cgt_Un);
else
ig.Emit (OpCodes.Cgt);
ig.Emit (OpCodes.Ldc_I4_0);
opcode = OpCodes.Ceq;
break;
case Operator.GreaterThanOrEqual:
Type le = left.Type;
if (is_unsigned || (le == TypeManager.double_type || le == TypeManager.float_type))
ig.Emit (OpCodes.Clt_Un);
else
ig.Emit (OpCodes.Clt);
ig.Emit (OpCodes.Ldc_I4_0);
opcode = OpCodes.Ceq;
break;
case Operator.BitwiseOr:
opcode = OpCodes.Or;
break;
case Operator.BitwiseAnd:
opcode = OpCodes.And;
break;
case Operator.ExclusiveOr:
opcode = OpCodes.Xor;
break;
default:
throw new Exception ("This should not happen: Operator = "
+ oper.ToString ());
}
ig.Emit (opcode);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Binary target = (Binary) t;
target.left = left.Clone (clonectx);
target.right = right.Clone (clonectx);
}
public override Expression CreateExpressionTree (EmitContext ec)
{
string method_name;
switch (oper) {
case Operator.Addition:
if (ec.CheckState)
method_name = "AddChecked";
else
method_name = "Add";
break;
case Operator.BitwiseAnd:
method_name = "And";
break;
case Operator.LogicalAnd:
method_name = "AndAlso";
break;
case Operator.BitwiseOr:
method_name = "Or";
break;
case Operator.LogicalOr:
method_name = "OrElse";
break;
default:
throw new InternalErrorException ("Unknown expression tree binary operator " + oper);
}
ArrayList args = new ArrayList (2);
args.Add (new Argument (left.CreateExpressionTree (ec)));
args.Add (new Argument (right.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall (method_name, args);
}
}
//
// Object created by Binary when the binary operator uses an method instead of being
// a binary operation that maps to a CIL binary operation.
//
public class BinaryMethod : Expression {
public MethodBase method;
public ArrayList Arguments;
public BinaryMethod (Type t, MethodBase m, ArrayList args)
{
method = m;
Arguments = args;
type = t;
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Invocation.EmitArguments (ec, Arguments, false, null);
if (method is MethodInfo)
ig.Emit (OpCodes.Call, (MethodInfo) method);
else
ig.Emit (OpCodes.Call, (ConstructorInfo) method);
}
}
//
// Represents the operation a + b [+ c [+ d [+ ...]]], where a is a string
// b, c, d... may be strings or objects.
//
public class StringConcat : Expression {
ArrayList arguments;
public StringConcat (EmitContext ec, Location loc, Expression left, Expression right)
{
this.loc = loc;
type = TypeManager.string_type;
eclass = ExprClass.Value;
arguments = new ArrayList (2);
Append (ec, left);
Append (ec, right);
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public void Append (EmitContext ec, Expression operand)
{
//
// Constant folding
//
StringConstant sc = operand as StringConstant;
if (sc != null) {
if (arguments.Count != 0) {
Argument last_argument = (Argument) arguments [arguments.Count - 1];
StringConstant last_expr_constant = last_argument.Expr as StringConstant;
if (last_expr_constant != null) {
last_argument.Expr = new StringConstant (
last_expr_constant.Value + sc.Value, sc.Location);
return;
}
}
} else {
//
// Multiple (3+) concatenation are resolved as multiple StringConcat instances
//
StringConcat concat_oper = operand as StringConcat;
if (concat_oper != null) {
arguments.AddRange (concat_oper.arguments);
return;
}
}
//
// Conversion to object
//
if (operand.Type != TypeManager.string_type) {
Expression expr = Convert.ImplicitConversion (ec, operand, TypeManager.object_type, loc);
if (expr == null) {
Binary.Error_OperatorCannotBeApplied (loc, "+", TypeManager.string_type, operand.Type);
return;
}
operand = expr;
}
arguments.Add (new Argument (operand));
}
Expression CreateConcatInvocation ()
{
return new Invocation (
new MemberAccess (new MemberAccess (new QualifiedAliasMember ("global", "System", loc), "String", loc), "Concat", loc),
arguments, true);
}
public override void Emit (EmitContext ec)
{
Expression concat = CreateConcatInvocation ();
concat = concat.Resolve (ec);
if (concat != null)
concat.Emit (ec);
}
}
//
// Object created with +/= on delegates
//
public class BinaryDelegate : Expression {
MethodInfo method;
ArrayList args;
public BinaryDelegate (Type t, MethodInfo mi, ArrayList args)
{
method = mi;
this.args = args;
type = t;
eclass = ExprClass.Value;
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Invocation.EmitArguments (ec, args, false, null);
ig.Emit (OpCodes.Call, (MethodInfo) method);
ig.Emit (OpCodes.Castclass, type);
}
public Expression Right {
get {
Argument arg = (Argument) args [1];
return arg.Expr;
}
}
public bool IsAddition {
get {
return method == TypeManager.delegate_combine_delegate_delegate;
}
}
}
//
// User-defined conditional logical operator
public class ConditionalLogicalOperator : Expression {
Expression left, right;
bool is_and;
public ConditionalLogicalOperator (bool is_and, Expression left, Expression right, Type t, Location loc)
{
type = t;
eclass = ExprClass.Value;
this.loc = loc;
this.left = left;
this.right = right;
this.is_and = is_and;
}
protected void Error19 ()
{
Binary.Error_OperatorCannotBeApplied (loc, is_and ? "&&" : "||", left.GetSignatureForError (), right.GetSignatureForError ());
}
protected void Error218 ()
{
Error (218, "The type ('" + TypeManager.CSharpName (type) + "') must contain " +
"declarations of operator true and operator false");
}
Expression op_true, op_false, op;
LocalTemporary left_temp;
public override Expression DoResolve (EmitContext ec)
{
MethodGroupExpr operator_group;
operator_group = MethodLookup (ec.ContainerType, type, is_and ? "op_BitwiseAnd" : "op_BitwiseOr", loc) as MethodGroupExpr;
if (operator_group == null) {
Error19 ();
return null;
}
left_temp = new LocalTemporary (type);
ArrayList arguments = new ArrayList (2);
arguments.Add (new Argument (left_temp, Argument.AType.Expression));
arguments.Add (new Argument (right, Argument.AType.Expression));
operator_group = operator_group.OverloadResolve (ec, ref arguments, false, loc);
if (operator_group == null) {
Error19 ();
return null;
}
MethodInfo method = (MethodInfo)operator_group;
if (method.ReturnType != type) {
Report.Error (217, loc, "In order to be applicable as a short circuit operator a user-defined logical operator `{0}' " +
"must have the same return type as the type of its 2 parameters", TypeManager.CSharpSignature (method));
return null;
}
op = new StaticCallExpr (method, arguments, loc);
op_true = GetOperatorTrue (ec, left_temp, loc);
op_false = GetOperatorFalse (ec, left_temp, loc);
if ((op_true == null) || (op_false == null)) {
Error218 ();
return null;
}
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Label false_target = ig.DefineLabel ();
Label end_target = ig.DefineLabel ();
left.Emit (ec);
left_temp.Store (ec);
(is_and ? op_false : op_true).EmitBranchable (ec, false_target, false);
left_temp.Emit (ec);
ig.Emit (OpCodes.Br, end_target);
ig.MarkLabel (false_target);
op.Emit (ec);
ig.MarkLabel (end_target);
// We release 'left_temp' here since 'op' may refer to it too
left_temp.Release (ec);
}
}
public class PointerArithmetic : Expression {
Expression left, right;
bool is_add;
//
// We assume that `l' is always a pointer
//
public PointerArithmetic (bool is_addition, Expression l, Expression r, Type t, Location loc)
{
type = t;
this.loc = loc;
left = l;
right = r;
is_add = is_addition;
}
public override Expression DoResolve (EmitContext ec)
{
eclass = ExprClass.Variable;
if (left.Type == TypeManager.void_ptr_type) {
Error (242, "The operation in question is undefined on void pointers");
return null;
}
return this;
}
public override void Emit (EmitContext ec)
{
Type op_type = left.Type;
ILGenerator ig = ec.ig;
// It must be either array or fixed buffer
Type element = TypeManager.HasElementType (op_type) ?
element = TypeManager.GetElementType (op_type) :
element = AttributeTester.GetFixedBuffer (((FieldExpr)left).FieldInfo).ElementType;
int size = GetTypeSize (element);
Type rtype = right.Type;
if (rtype.IsPointer){
//
// handle (pointer - pointer)
//
left.Emit (ec);
right.Emit (ec);
ig.Emit (OpCodes.Sub);
if (size != 1){
if (size == 0)
ig.Emit (OpCodes.Sizeof, element);
else
IntLiteral.EmitInt (ig, size);
ig.Emit (OpCodes.Div);
}
ig.Emit (OpCodes.Conv_I8);
} else {
//
// handle + and - on (pointer op int)
//
left.Emit (ec);
ig.Emit (OpCodes.Conv_I);
Constant right_const = right as Constant;
if (right_const != null && size != 0) {
Expression ex = ConstantFold.BinaryFold (ec, Binary.Operator.Multiply, new IntConstant (size, right.Location), right_const, loc);
if (ex == null)
return;
ex.Emit (ec);
} else {
right.Emit (ec);
if (size != 1){
if (size == 0)
ig.Emit (OpCodes.Sizeof, element);
else
IntLiteral.EmitInt (ig, size);
if (rtype == TypeManager.int64_type)
ig.Emit (OpCodes.Conv_I8);
else if (rtype == TypeManager.uint64_type)
ig.Emit (OpCodes.Conv_U8);
ig.Emit (OpCodes.Mul);
}
}
if (rtype == TypeManager.int64_type || rtype == TypeManager.uint64_type)
ig.Emit (OpCodes.Conv_I);
if (is_add)
ig.Emit (OpCodes.Add);
else
ig.Emit (OpCodes.Sub);
}
}
}
///
/// Implements the ternary conditional operator (?:)
///
public class Conditional : Expression {
Expression expr, true_expr, false_expr;
public Conditional (Expression expr, Expression true_expr, Expression false_expr)
{
this.expr = expr;
this.true_expr = true_expr;
this.false_expr = false_expr;
this.loc = expr.Location;
}
public Expression Expr {
get {
return expr;
}
}
public Expression TrueExpr {
get {
return true_expr;
}
}
public Expression FalseExpr {
get {
return false_expr;
}
}
public override Expression DoResolve (EmitContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
#if GMCS_SOURCE
if (TypeManager.IsNullableValueType (expr.Type))
return new Nullable.LiftedConditional (expr, true_expr, false_expr, loc).Resolve (ec);
#endif
if (expr.Type != TypeManager.bool_type){
expr = Expression.ResolveBoolean (
ec, expr, loc);
if (expr == null)
return null;
}
Assign ass = expr as Assign;
if (ass != null && ass.Source is Constant) {
Report.Warning (665, 3, loc, "Assignment in conditional expression is always constant; did you mean to use == instead of = ?");
}
true_expr = true_expr.Resolve (ec);
false_expr = false_expr.Resolve (ec);
if (true_expr == null || false_expr == null)
return null;
eclass = ExprClass.Value;
if (true_expr.Type == false_expr.Type) {
type = true_expr.Type;
if (type == TypeManager.null_type) {
// TODO: probably will have to implement ConditionalConstant
// to call method without return constant as well
Report.Warning (-101, 1, loc, "Conditional expression will always return same value");
return true_expr;
}
} else {
Expression conv;
Type true_type = true_expr.Type;
Type false_type = false_expr.Type;
//
// First, if an implicit conversion exists from true_expr
// to false_expr, then the result type is of type false_expr.Type
//
conv = Convert.ImplicitConversion (ec, true_expr, false_type, loc);
if (conv != null){
//
// Check if both can convert implicitl to each other's type
//
if (Convert.ImplicitConversion (ec, false_expr, true_type, loc) != null){
Error (172,
"Can not compute type of conditional expression " +
"as `" + TypeManager.CSharpName (true_expr.Type) +
"' and `" + TypeManager.CSharpName (false_expr.Type) +
"' convert implicitly to each other");
return null;
}
type = false_type;
true_expr = conv;
} else if ((conv = Convert.ImplicitConversion(ec, false_expr, true_type,loc))!= null){
type = true_type;
false_expr = conv;
} else {
Report.Error (173, loc, "Type of conditional expression cannot be determined because there is no implicit conversion between `{0}' and `{1}'",
true_expr.GetSignatureForError (), false_expr.GetSignatureForError ());
return null;
}
}
// Dead code optimalization
if (expr is BoolConstant){
BoolConstant bc = (BoolConstant) expr;
Report.Warning (429, 4, bc.Value ? false_expr.Location : true_expr.Location, "Unreachable expression code detected");
return bc.Value ? true_expr : false_expr;
}
return this;
}
public override TypeExpr ResolveAsTypeTerminal (IResolveContext ec, bool silent)
{
return null;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Label false_target = ig.DefineLabel ();
Label end_target = ig.DefineLabel ();
expr.EmitBranchable (ec, false_target, false);
true_expr.Emit (ec);
ig.Emit (OpCodes.Br, end_target);
ig.MarkLabel (false_target);
false_expr.Emit (ec);
ig.MarkLabel (end_target);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Conditional target = (Conditional) t;
target.expr = expr.Clone (clonectx);
target.true_expr = true_expr.Clone (clonectx);
target.false_expr = false_expr.Clone (clonectx);
}
}
public abstract class VariableReference : Expression, IAssignMethod, IMemoryLocation {
bool prepared;
LocalTemporary temp;
public abstract Variable Variable {
get;
}
public abstract bool IsRef {
get;
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
//
// This method is used by parameters that are references, that are
// being passed as references: we only want to pass the pointer (that
// is already stored in the parameter, not the address of the pointer,
// and not the value of the variable).
//
public void EmitLoad (EmitContext ec)
{
Report.Debug (64, "VARIABLE EMIT LOAD", this, Variable, type, loc);
if (!prepared)
Variable.EmitInstance (ec);
Variable.Emit (ec);
}
public void Emit (EmitContext ec, bool leave_copy)
{
Report.Debug (64, "VARIABLE EMIT", this, Variable, type, IsRef, loc);
EmitLoad (ec);
if (IsRef) {
//
// If we are a reference, we loaded on the stack a pointer
// Now lets load the real value
//
LoadFromPtr (ec.ig, type);
}
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (IsRef || Variable.NeedsTemporary) {
temp = new LocalTemporary (Type);
temp.Store (ec);
}
}
}
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy,
bool prepare_for_load)
{
Report.Debug (64, "VARIABLE EMIT ASSIGN", this, Variable, type, IsRef,
source, loc);
ILGenerator ig = ec.ig;
prepared = prepare_for_load;
Variable.EmitInstance (ec);
if (prepare_for_load) {
if (Variable.HasInstance)
ig.Emit (OpCodes.Dup);
}
if (IsRef)
Variable.Emit (ec);
source.Emit (ec);
// HACK: variable is already emitted when source is an initializer
if (source is NewInitialize)
return;
if (leave_copy) {
ig.Emit (OpCodes.Dup);
if (IsRef || Variable.NeedsTemporary) {
temp = new LocalTemporary (Type);
temp.Store (ec);
}
}
if (IsRef)
StoreFromPtr (ig, type);
else
Variable.EmitAssign (ec);
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
}
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
Variable.EmitInstance (ec);
Variable.EmitAddressOf (ec);
}
}
///
/// Local variables
///
public class LocalVariableReference : VariableReference, IVariable {
public readonly string Name;
public Block Block;
public LocalInfo local_info;
bool is_readonly;
Variable variable;
public LocalVariableReference (Block block, string name, Location l)
{
Block = block;
Name = name;
loc = l;
eclass = ExprClass.Variable;
}
//
// Setting `is_readonly' to false will allow you to create a writable
// reference to a read-only variable. This is used by foreach and using.
//
public LocalVariableReference (Block block, string name, Location l,
LocalInfo local_info, bool is_readonly)
: this (block, name, l)
{
this.local_info = local_info;
this.is_readonly = is_readonly;
}
public VariableInfo VariableInfo {
get { return local_info.VariableInfo; }
}
public override bool IsRef {
get { return false; }
}
public bool IsReadOnly {
get { return is_readonly; }
}
public bool VerifyAssigned (EmitContext ec)
{
VariableInfo variable_info = local_info.VariableInfo;
return variable_info == null || variable_info.IsAssigned (ec, loc);
}
void ResolveLocalInfo ()
{
if (local_info == null) {
local_info = Block.GetLocalInfo (Name);
type = local_info.VariableType;
is_readonly = local_info.ReadOnly;
}
}
protected Expression DoResolveBase (EmitContext ec)
{
type = local_info.VariableType;
Expression e = Block.GetConstantExpression (Name);
if (e != null)
return e.Resolve (ec);
if (!VerifyAssigned (ec))
return null;
//
// If we are referencing a variable from the external block
// flag it for capturing
//
if (ec.MustCaptureVariable (local_info)) {
if (local_info.AddressTaken){
AnonymousMethod.Error_AddressOfCapturedVar (local_info.Name, loc);
return null;
}
if (!ec.IsInProbingMode)
{
ScopeInfo scope = local_info.Block.CreateScopeInfo ();
variable = scope.AddLocal (local_info);
type = variable.Type;
}
}
return this;
}
public override Expression DoResolve (EmitContext ec)
{
ResolveLocalInfo ();
local_info.Used = true;
if (type == null && local_info.Type is VarExpr) {
local_info.VariableType = TypeManager.object_type;
Error_VariableIsUsedBeforeItIsDeclared (Name);
return null;
}
return DoResolveBase (ec);
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
ResolveLocalInfo ();
// is out param
if (right_side == EmptyExpression.OutAccess)
local_info.Used = true;
// Infer implicitly typed local variable
if (type == null) {
VarExpr ve = local_info.Type as VarExpr;
if (ve != null) {
ve.DoResolveLValue (ec, right_side);
type = local_info.VariableType = ve.Type;
}
}
if (is_readonly) {
int code;
string msg;
if (right_side == EmptyExpression.OutAccess) {
code = 1657; msg = "Cannot pass `{0}' as a ref or out argument because it is a `{1}'";
} else if (right_side == EmptyExpression.LValueMemberAccess) {
code = 1654; msg = "Cannot assign to members of `{0}' because it is a `{1}'";
} else if (right_side == EmptyExpression.LValueMemberOutAccess) {
code = 1655; msg = "Cannot pass members of `{0}' as ref or out arguments because it is a `{1}'";
} else {
code = 1656; msg = "Cannot assign to `{0}' because it is a `{1}'";
}
Report.Error (code, loc, msg, Name, local_info.GetReadOnlyContext ());
return null;
}
if (VariableInfo != null)
VariableInfo.SetAssigned (ec);
return DoResolveBase (ec);
}
public bool VerifyFixed ()
{
// A local Variable is always fixed.
return true;
}
public override int GetHashCode ()
{
return Name.GetHashCode ();
}
public override bool Equals (object obj)
{
LocalVariableReference lvr = obj as LocalVariableReference;
if (lvr == null)
return false;
return Name == lvr.Name && Block == lvr.Block;
}
public override Variable Variable {
get { return variable != null ? variable : local_info.Variable; }
}
public override string ToString ()
{
return String.Format ("{0} ({1}:{2})", GetType (), Name, loc);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
LocalVariableReference target = (LocalVariableReference) t;
target.Block = clonectx.LookupBlock (Block);
if (local_info != null)
target.local_info = clonectx.LookupVariable (local_info);
}
}
///
/// This represents a reference to a parameter in the intermediate
/// representation.
///
public class ParameterReference : VariableReference, IVariable {
readonly ToplevelParameterInfo pi;
readonly ToplevelBlock referenced;
Variable variable;
public bool is_ref, is_out;
public bool IsOut {
get { return is_out; }
}
public override bool IsRef {
get { return is_ref; }
}
public string Name {
get { return Parameter.Name; }
}
public Parameter Parameter {
get { return pi.Parameter; }
}
public ParameterReference (ToplevelBlock referenced, ToplevelParameterInfo pi, Location loc)
{
this.pi = pi;
this.referenced = referenced;
this.loc = loc;
eclass = ExprClass.Variable;
}
public VariableInfo VariableInfo {
get { return pi.VariableInfo; }
}
public override Variable Variable {
get { return variable != null ? variable : Parameter.Variable; }
}
public bool VerifyFixed ()
{
// A parameter is fixed if it's a value parameter (i.e., no modifier like out, ref, param).
return Parameter.ModFlags == Parameter.Modifier.NONE;
}
public bool IsAssigned (EmitContext ec, Location loc)
{
// HACK: Variables are not captured in probing mode
if (ec.IsInProbingMode)
return true;
if (!ec.DoFlowAnalysis || !is_out || ec.CurrentBranching.IsAssigned (VariableInfo))
return true;
Report.Error (269, loc, "Use of unassigned out parameter `{0}'", Name);
return false;
}
public bool IsFieldAssigned (EmitContext ec, string field_name, Location loc)
{
if (!ec.DoFlowAnalysis || !is_out || ec.CurrentBranching.IsFieldAssigned (VariableInfo, field_name))
return true;
Report.Error (170, loc, "Use of possibly unassigned field `{0}'", field_name);
return false;
}
public void SetAssigned (EmitContext ec)
{
if (is_out && ec.DoFlowAnalysis)
ec.CurrentBranching.SetAssigned (VariableInfo);
}
public void SetFieldAssigned (EmitContext ec, string field_name)
{
if (is_out && ec.DoFlowAnalysis)
ec.CurrentBranching.SetFieldAssigned (VariableInfo, field_name);
}
protected bool DoResolveBase (EmitContext ec)
{
Parameter par = Parameter;
if (!par.Resolve (ec)) {
//TODO:
}
type = par.ParameterType;
Parameter.Modifier mod = par.ModFlags;
is_ref = (mod & Parameter.Modifier.ISBYREF) != 0;
is_out = (mod & Parameter.Modifier.OUT) == Parameter.Modifier.OUT;
eclass = ExprClass.Variable;
AnonymousContainer am = ec.CurrentAnonymousMethod;
if (am == null)
return true;
ToplevelBlock declared = pi.Block;
if (is_ref && declared != referenced) {
Report.Error (1628, Location,
"Cannot use ref or out parameter `{0}' inside an " +
"anonymous method block", par.Name);
return false;
}
if (!am.IsIterator && declared == referenced)
return true;
// Don't capture aruments when the probing is on
if (!ec.IsInProbingMode) {
ScopeInfo scope = declared.CreateScopeInfo ();
variable = scope.AddParameter (par, pi.Index);
type = variable.Type;
}
return true;
}
public override int GetHashCode ()
{
return Name.GetHashCode ();
}
public override bool Equals (object obj)
{
ParameterReference pr = obj as ParameterReference;
if (pr == null)
return false;
return Name == pr.Name && referenced == pr.referenced;
}
public override Expression CreateExpressionTree (EmitContext ec)
{
return Parameter.ExpressionTreeVariableReference ();
}
//
// Notice that for ref/out parameters, the type exposed is not the
// same type exposed externally.
//
// for "ref int a":
// externally we expose "int&"
// here we expose "int".
//
// We record this in "is_ref". This means that the type system can treat
// the type as it is expected, but when we generate the code, we generate
// the alternate kind of code.
//
public override Expression DoResolve (EmitContext ec)
{
if (!DoResolveBase (ec))
return null;
if (is_out && ec.DoFlowAnalysis &&
(!ec.OmitStructFlowAnalysis || !VariableInfo.TypeInfo.IsStruct) && !IsAssigned (ec, loc))
return null;
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (!DoResolveBase (ec))
return null;
// HACK: parameters are not captured when probing is on
if (!ec.IsInProbingMode)
SetAssigned (ec);
return this;
}
static public void EmitLdArg (ILGenerator ig, int x)
{
if (x <= 255){
switch (x){
case 0: ig.Emit (OpCodes.Ldarg_0); break;
case 1: ig.Emit (OpCodes.Ldarg_1); break;
case 2: ig.Emit (OpCodes.Ldarg_2); break;
case 3: ig.Emit (OpCodes.Ldarg_3); break;
default: ig.Emit (OpCodes.Ldarg_S, (byte) x); break;
}
} else
ig.Emit (OpCodes.Ldarg, x);
}
public override string ToString ()
{
return "ParameterReference[" + Name + "]";
}
}
///
/// Used for arguments to New(), Invocation()
///
public class Argument {
public enum AType : byte {
Expression,
Ref,
Out,
ArgList
};
public static readonly Argument[] Empty = new Argument [0];
public readonly AType ArgType;
public Expression Expr;
public Argument (Expression expr, AType type)
{
this.Expr = expr;
this.ArgType = type;
}
public Argument (Expression expr)
{
this.Expr = expr;
this.ArgType = AType.Expression;
}
public Type Type {
get {
if (ArgType == AType.Ref || ArgType == AType.Out)
return TypeManager.GetReferenceType (Expr.Type);
else
return Expr.Type;
}
}
public Parameter.Modifier Modifier
{
get {
switch (ArgType) {
case AType.Out:
return Parameter.Modifier.OUT;
case AType.Ref:
return Parameter.Modifier.REF;
default:
return Parameter.Modifier.NONE;
}
}
}
public string GetSignatureForError ()
{
if (Expr.eclass == ExprClass.MethodGroup)
return Expr.ExprClassName;
return Expr.GetSignatureForError ();
}
public bool ResolveMethodGroup (EmitContext ec)
{
SimpleName sn = Expr as SimpleName;
if (sn != null)
Expr = sn.GetMethodGroup ();
// FIXME: csc doesn't report any error if you try to use `ref' or
// `out' in a delegate creation expression.
Expr = Expr.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
if (Expr == null)
return false;
return true;
}
public bool Resolve (EmitContext ec, Location loc)
{
using (ec.With (EmitContext.Flags.DoFlowAnalysis, true)) {
// Verify that the argument is readable
if (ArgType != AType.Out)
Expr = Expr.Resolve (ec);
// Verify that the argument is writeable
if (Expr != null && (ArgType == AType.Out || ArgType == AType.Ref))
Expr = Expr.ResolveLValue (ec, EmptyExpression.OutAccess, loc);
return Expr != null;
}
}
public void Emit (EmitContext ec)
{
if (ArgType != AType.Ref && ArgType != AType.Out) {
Expr.Emit (ec);
return;
}
AddressOp mode = AddressOp.Store;
if (ArgType == AType.Ref)
mode |= AddressOp.Load;
IMemoryLocation ml = (IMemoryLocation) Expr;
ParameterReference pr = ml as ParameterReference;
//
// ParameterReferences might already be references, so we want
// to pass just the value
//
if (pr != null && pr.IsRef)
pr.EmitLoad (ec);
else
ml.AddressOf (ec, mode);
}
public Argument Clone (CloneContext clonectx)
{
return new Argument (Expr.Clone (clonectx), ArgType);
}
}
///
/// Invocation of methods or delegates.
///
public class Invocation : ExpressionStatement {
protected ArrayList Arguments;
Expression expr;
protected MethodGroupExpr mg;
bool arguments_resolved;
//
// arguments is an ArrayList, but we do not want to typecast,
// as it might be null.
//
public Invocation (Expression expr, ArrayList arguments)
{
SimpleName sn = expr as SimpleName;
if (sn != null)
this.expr = sn.GetMethodGroup ();
else
this.expr = expr;
Arguments = arguments;
loc = expr.Location;
}
public Invocation (Expression expr, ArrayList arguments, bool arguments_resolved)
: this (expr, arguments)
{
this.arguments_resolved = arguments_resolved;
}
public static string FullMethodDesc (MethodBase mb)
{
if (mb == null)
return "";
StringBuilder sb;
if (mb is MethodInfo) {
sb = new StringBuilder (TypeManager.CSharpName (((MethodInfo) mb).ReturnType));
sb.Append (" ");
}
else
sb = new StringBuilder ();
sb.Append (TypeManager.CSharpSignature (mb));
return sb.ToString ();
}
public override Expression CreateExpressionTree (EmitContext ec)
{
ArrayList args = new ArrayList (Arguments.Count + 3);
if (mg.IsInstance)
args.Add (new Argument (mg.InstanceExpression.CreateExpressionTree (ec)));
else
args.Add (new Argument (new NullConstant (loc).CreateExpressionTree (ec)));
args.Add (new Argument (mg.CreateExpressionTree (ec)));
foreach (Argument a in Arguments) {
Expression e = a.Expr.CreateExpressionTree (ec);
if (e != null)
args.Add (new Argument (e));
}
return CreateExpressionFactoryCall ("Call", args);
}
public override Expression DoResolve (EmitContext ec)
{
// Don't resolve already resolved expression
if (eclass != ExprClass.Invalid)
return this;
Expression expr_resolved = expr.Resolve (ec, ResolveFlags.VariableOrValue | ResolveFlags.MethodGroup);
if (expr_resolved == null)
return null;
mg = expr_resolved as MethodGroupExpr;
if (mg == null) {
Type expr_type = expr_resolved.Type;
if (expr_type != null && TypeManager.IsDelegateType (expr_type)){
return (new DelegateInvocation (
expr_resolved, Arguments, loc)).Resolve (ec);
}
expr_resolved.Error_UnexpectedKind (ResolveFlags.MethodGroup, loc);
return null;
}
//
// Next, evaluate all the expressions in the argument list
//
if (Arguments != null && !arguments_resolved) {
for (int i = 0; i < Arguments.Count; ++i)
{
if (!((Argument)Arguments[i]).Resolve(ec, loc))
return null;
}
}
mg = DoResolveOverload (ec);
if (mg == null)
return null;
MethodInfo method = (MethodInfo)mg;
if (method != null) {
type = TypeManager.TypeToCoreType (method.ReturnType);
// TODO: this is a copy of mg.ResolveMemberAccess method
Expression iexpr = mg.InstanceExpression;
if (method.IsStatic) {
if (iexpr == null ||
iexpr is This || iexpr is EmptyExpression ||
mg.IdenticalTypeName) {
mg.InstanceExpression = null;
} else {
MemberExpr.error176 (loc, mg.GetSignatureForError ());
return null;
}
}
}
if (type.IsPointer){
if (!ec.InUnsafe){
UnsafeError (loc);
return null;
}
}
//
// Only base will allow this invocation to happen.
//
if (mg.IsBase && method.IsAbstract){
Error_CannotCallAbstractBase (TypeManager.CSharpSignature (method));
return null;
}
if (Arguments == null && method.DeclaringType == TypeManager.object_type && method.Name == "Finalize") {
if (mg.IsBase)
Report.Error (250, loc, "Do not directly call your base class Finalize method. It is called automatically from your destructor");
else
Report.Error (245, loc, "Destructors and object.Finalize cannot be called directly. Consider calling IDisposable.Dispose if available");
return null;
}
if (IsSpecialMethodInvocation (method)) {
return null;
}
if (mg.InstanceExpression != null)
mg.InstanceExpression.CheckMarshalByRefAccess (ec);
eclass = ExprClass.Value;
return this;
}
protected virtual MethodGroupExpr DoResolveOverload (EmitContext ec)
{
return mg.OverloadResolve (ec, ref Arguments, false, loc);
}
bool IsSpecialMethodInvocation (MethodBase method)
{
if (!TypeManager.IsSpecialMethod (method))
return false;
Report.SymbolRelatedToPreviousError (method);
Report.Error (571, loc, "`{0}': cannot explicitly call operator or accessor",
TypeManager.CSharpSignature (method, true));
return true;
}
///
/// Emits a list of resolved Arguments that are in the arguments
/// ArrayList.
///
/// The MethodBase argument might be null if the
/// emission of the arguments is known not to contain
/// a `params' field (for example in constructors or other routines
/// that keep their arguments in this structure)
///
/// if `dup_args' is true, a copy of the arguments will be left
/// on the stack. If `dup_args' is true, you can specify `this_arg'
/// which will be duplicated before any other args. Only EmitCall
/// should be using this interface.
///
public static void EmitArguments (EmitContext ec, ArrayList arguments, bool dup_args, LocalTemporary this_arg)
{
if (arguments == null)
return;
int top = arguments.Count;
LocalTemporary [] temps = null;
if (dup_args && top != 0)
temps = new LocalTemporary [top];
int argument_index = 0;
Argument a;
for (int i = 0; i < top; i++) {
a = (Argument) arguments [argument_index++];
a.Emit (ec);
if (dup_args) {
ec.ig.Emit (OpCodes.Dup);
(temps [i] = new LocalTemporary (a.Type)).Store (ec);
}
}
if (dup_args) {
if (this_arg != null)
this_arg.Emit (ec);
for (int i = 0; i < top; i ++) {
temps [i].Emit (ec);
temps [i].Release (ec);
}
}
}
static Type[] GetVarargsTypes (MethodBase mb, ArrayList arguments)
{
ParameterData pd = TypeManager.GetParameterData (mb);
if (arguments == null)
return new Type [0];
Argument a = (Argument) arguments [pd.Count - 1];
Arglist list = (Arglist) a.Expr;
return list.ArgumentTypes;
}
///
/// This checks the ConditionalAttribute on the method
///
public static bool IsMethodExcluded (MethodBase method)
{
if (method.IsConstructor)
return false;
method = TypeManager.DropGenericMethodArguments (method);
if (method.DeclaringType.Module == CodeGen.Module.Builder) {
IMethodData md = TypeManager.GetMethod (method);
if (md != null)
return md.IsExcluded ();
// For some methods (generated by delegate class) GetMethod returns null
// because they are not included in builder_to_method table
return false;
}
return AttributeTester.IsConditionalMethodExcluded (method);
}
///
/// is_base tells whether we want to force the use of the `call'
/// opcode instead of using callvirt. Call is required to call
/// a specific method, while callvirt will always use the most
/// recent method in the vtable.
///
/// is_static tells whether this is an invocation on a static method
///
/// instance_expr is an expression that represents the instance
/// it must be non-null if is_static is false.
///
/// method is the method to invoke.
///
/// Arguments is the list of arguments to pass to the method or constructor.
///
public static void EmitCall (EmitContext ec, bool is_base,
Expression instance_expr,
MethodBase method, ArrayList Arguments, Location loc)
{
EmitCall (ec, is_base, instance_expr, method, Arguments, loc, false, false);
}
// `dup_args' leaves an extra copy of the arguments on the stack
// `omit_args' does not leave any arguments at all.
// So, basically, you could make one call with `dup_args' set to true,
// and then another with `omit_args' set to true, and the two calls
// would have the same set of arguments. However, each argument would
// only have been evaluated once.
public static void EmitCall (EmitContext ec, bool is_base,
Expression instance_expr,
MethodBase method, ArrayList Arguments, Location loc,
bool dup_args, bool omit_args)
{
ILGenerator ig = ec.ig;
bool struct_call = false;
bool this_call = false;
LocalTemporary this_arg = null;
Type decl_type = method.DeclaringType;
if (!RootContext.StdLib) {
// Replace any calls to the system's System.Array type with calls to
// the newly created one.
if (method == TypeManager.system_int_array_get_length)
method = TypeManager.int_array_get_length;
else if (method == TypeManager.system_int_array_get_rank)
method = TypeManager.int_array_get_rank;
else if (method == TypeManager.system_object_array_clone)
method = TypeManager.object_array_clone;
else if (method == TypeManager.system_int_array_get_length_int)
method = TypeManager.int_array_get_length_int;
else if (method == TypeManager.system_int_array_get_lower_bound_int)
method = TypeManager.int_array_get_lower_bound_int;
else if (method == TypeManager.system_int_array_get_upper_bound_int)
method = TypeManager.int_array_get_upper_bound_int;
else if (method == TypeManager.system_void_array_copyto_array_int)
method = TypeManager.void_array_copyto_array_int;
}
if (!ec.IsInObsoleteScope) {
//
// This checks ObsoleteAttribute on the method and on the declaring type
//
ObsoleteAttribute oa = AttributeTester.GetMethodObsoleteAttribute (method);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, TypeManager.CSharpSignature (method), loc);
oa = AttributeTester.GetObsoleteAttribute (method.DeclaringType);
if (oa != null) {
AttributeTester.Report_ObsoleteMessage (oa, method.DeclaringType.FullName, loc);
}
}
if (IsMethodExcluded (method))
return;
bool is_static = method.IsStatic;
if (!is_static){
if (instance_expr == EmptyExpression.Null) {
SimpleName.Error_ObjectRefRequired (ec, loc, TypeManager.CSharpSignature (method));
return;
}
this_call = instance_expr is This;
if (decl_type.IsValueType || (!this_call && instance_expr.Type.IsValueType))
struct_call = true;
//
// If this is ourselves, push "this"
//
if (!omit_args) {
Type t = null;
Type iexpr_type = instance_expr.Type;
//
// Push the instance expression
//
if (TypeManager.IsValueType (iexpr_type)) {
//
// Special case: calls to a function declared in a
// reference-type with a value-type argument need
// to have their value boxed.
if (decl_type.IsValueType ||
TypeManager.IsGenericParameter (iexpr_type)) {
//
// If the expression implements IMemoryLocation, then
// we can optimize and use AddressOf on the
// return.
//
// If not we have to use some temporary storage for
// it.
if (instance_expr is IMemoryLocation) {
((IMemoryLocation)instance_expr).
AddressOf (ec, AddressOp.LoadStore);
} else {
LocalTemporary temp = new LocalTemporary (iexpr_type);
instance_expr.Emit (ec);
temp.Store (ec);
temp.AddressOf (ec, AddressOp.Load);
}
// avoid the overhead of doing this all the time.
if (dup_args)
t = TypeManager.GetReferenceType (iexpr_type);
} else {
instance_expr.Emit (ec);
ig.Emit (OpCodes.Box, instance_expr.Type);
t = TypeManager.object_type;
}
} else {
instance_expr.Emit (ec);
t = instance_expr.Type;
}
if (dup_args) {
ig.Emit (OpCodes.Dup);
if (Arguments != null && Arguments.Count != 0) {
this_arg = new LocalTemporary (t);
this_arg.Store (ec);
}
}
}
}
if (!omit_args)
EmitArguments (ec, Arguments, dup_args, this_arg);
#if GMCS_SOURCE
if ((instance_expr != null) && (instance_expr.Type.IsGenericParameter))
ig.Emit (OpCodes.Constrained, instance_expr.Type);
#endif
OpCode call_op;
if (is_static || struct_call || is_base || (this_call && !method.IsVirtual))
call_op = OpCodes.Call;
else
call_op = OpCodes.Callvirt;
if ((method.CallingConvention & CallingConventions.VarArgs) != 0) {
Type[] varargs_types = GetVarargsTypes (method, Arguments);
ig.EmitCall (call_op, (MethodInfo) method, varargs_types);
return;
}
//
// If you have:
// this.DoFoo ();
// and DoFoo is not virtual, you can omit the callvirt,
// because you don't need the null checking behavior.
//
if (method is MethodInfo)
ig.Emit (call_op, (MethodInfo) method);
else
ig.Emit (call_op, (ConstructorInfo) method);
}
public override void Emit (EmitContext ec)
{
mg.EmitCall (ec, Arguments);
}
public override void EmitStatement (EmitContext ec)
{
Emit (ec);
//
// Pop the return value if there is one
//
if (TypeManager.TypeToCoreType (type) != TypeManager.void_type)
ec.ig.Emit (OpCodes.Pop);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Invocation target = (Invocation) t;
if (Arguments != null) {
target.Arguments = new ArrayList (Arguments.Count);
foreach (Argument a in Arguments)
target.Arguments.Add (a.Clone (clonectx));
}
target.expr = expr.Clone (clonectx);
}
}
public class InvocationOrCast : ExpressionStatement
{
Expression expr;
Expression argument;
public InvocationOrCast (Expression expr, Expression argument)
{
this.expr = expr;
this.argument = argument;
this.loc = expr.Location;
}
public override Expression DoResolve (EmitContext ec)
{
//
// First try to resolve it as a cast.
//
TypeExpr te = expr.ResolveAsTypeTerminal (ec, true);
if ((te != null) && (te.eclass == ExprClass.Type)) {
Cast cast = new Cast (te, argument, loc);
return cast.Resolve (ec);
}
//
// This can either be a type or a delegate invocation.
// Let's just resolve it and see what we'll get.
//
expr = expr.Resolve (ec, ResolveFlags.Type | ResolveFlags.VariableOrValue);
if (expr == null)
return null;
//
// Ok, so it's a Cast.
//
if (expr.eclass == ExprClass.Type) {
Cast cast = new Cast (new TypeExpression (expr.Type, loc), argument, loc);
return cast.Resolve (ec);
}
//
// It's a delegate invocation.
//
if (!TypeManager.IsDelegateType (expr.Type)) {
Error (149, "Method name expected");
return null;
}
ArrayList args = new ArrayList ();
args.Add (new Argument (argument, Argument.AType.Expression));
DelegateInvocation invocation = new DelegateInvocation (expr, args, loc);
return invocation.Resolve (ec);
}
public override ExpressionStatement ResolveStatement (EmitContext ec)
{
//
// First try to resolve it as a cast.
//
TypeExpr te = expr.ResolveAsTypeTerminal (ec, true);
if ((te != null) && (te.eclass == ExprClass.Type)) {
Error_InvalidExpressionStatement ();
return null;
}
//
// This can either be a type or a delegate invocation.
// Let's just resolve it and see what we'll get.
//
expr = expr.Resolve (ec, ResolveFlags.Type | ResolveFlags.VariableOrValue);
if ((expr == null) || (expr.eclass == ExprClass.Type)) {
Error_InvalidExpressionStatement ();
return null;
}
//
// It's a delegate invocation.
//
if (!TypeManager.IsDelegateType (expr.Type)) {
Error (149, "Method name expected");
return null;
}
ArrayList args = new ArrayList ();
args.Add (new Argument (argument, Argument.AType.Expression));
DelegateInvocation invocation = new DelegateInvocation (expr, args, loc);
return invocation.ResolveStatement (ec);
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Cannot happen");
}
public override void EmitStatement (EmitContext ec)
{
throw new Exception ("Cannot happen");
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
InvocationOrCast target = (InvocationOrCast) t;
target.expr = expr.Clone (clonectx);
target.argument = argument.Clone (clonectx);
}
}
//
// This class is used to "disable" the code generation for the
// temporary variable when initializing value types.
//
class EmptyAddressOf : EmptyExpression, IMemoryLocation {
public void AddressOf (EmitContext ec, AddressOp Mode)
{
// nothing
}
}
///
/// Implements the new expression
///
public class New : ExpressionStatement, IMemoryLocation {
ArrayList Arguments;
//
// During bootstrap, it contains the RequestedType,
// but if `type' is not null, it *might* contain a NewDelegate
// (because of field multi-initialization)
//
public Expression RequestedType;
MethodGroupExpr method;
//
// If set, the new expression is for a value_target, and
// we will not leave anything on the stack.
//
protected Expression value_target;
protected bool value_target_set;
bool is_type_parameter = false;
public New (Expression requested_type, ArrayList arguments, Location l)
{
RequestedType = requested_type;
Arguments = arguments;
loc = l;
}
public bool SetTargetVariable (Expression value)
{
value_target = value;
value_target_set = true;
if (!(value_target is IMemoryLocation)){
Error_UnexpectedKind (null, "variable", loc);
return false;
}
return true;
}
//
// This function is used to disable the following code sequence for
// value type initialization:
//
// AddressOf (temporary)
// Construct/Init
// LoadTemporary
//
// Instead the provide will have provided us with the address on the
// stack to store the results.
//
static Expression MyEmptyExpression;
public void DisableTemporaryValueType ()
{
if (MyEmptyExpression == null)
MyEmptyExpression = new EmptyAddressOf ();
//
// To enable this, look into:
// test-34 and test-89 and self bootstrapping.
//
// For instance, we can avoid a copy by using `newobj'
// instead of Call + Push-temp on value types.
// value_target = MyEmptyExpression;
}
///
/// Converts complex core type syntax like 'new int ()' to simple constant
///
public static Constant Constantify (Type t)
{
if (t == TypeManager.int32_type)
return new IntConstant (0, Location.Null);
if (t == TypeManager.uint32_type)
return new UIntConstant (0, Location.Null);
if (t == TypeManager.int64_type)
return new LongConstant (0, Location.Null);
if (t == TypeManager.uint64_type)
return new ULongConstant (0, Location.Null);
if (t == TypeManager.float_type)
return new FloatConstant (0, Location.Null);
if (t == TypeManager.double_type)
return new DoubleConstant (0, Location.Null);
if (t == TypeManager.short_type)
return new ShortConstant (0, Location.Null);
if (t == TypeManager.ushort_type)
return new UShortConstant (0, Location.Null);
if (t == TypeManager.sbyte_type)
return new SByteConstant (0, Location.Null);
if (t == TypeManager.byte_type)
return new ByteConstant (0, Location.Null);
if (t == TypeManager.char_type)
return new CharConstant ('\0', Location.Null);
if (t == TypeManager.bool_type)
return new BoolConstant (false, Location.Null);
if (t == TypeManager.decimal_type)
return new DecimalConstant (0, Location.Null);
if (TypeManager.IsEnumType (t))
return new EnumConstant (Constantify (TypeManager.EnumToUnderlying (t)), t);
return null;
}
//
// Checks whether the type is an interface that has the
// [ComImport, CoClass] attributes and must be treated
// specially
//
public Expression CheckComImport (EmitContext ec)
{
if (!type.IsInterface)
return null;
//
// Turn the call into:
// (the-interface-stated) (new class-referenced-in-coclassattribute ())
//
Type real_class = AttributeTester.GetCoClassAttribute (type);
if (real_class == null)
return null;
New proxy = new New (new TypeExpression (real_class, loc), Arguments, loc);
Cast cast = new Cast (new TypeExpression (type, loc), proxy, loc);
return cast.Resolve (ec);
}
public override Expression DoResolve (EmitContext ec)
{
//
// The New DoResolve might be called twice when initializing field
// expressions (see EmitFieldInitializers, the call to
// GetInitializerExpression will perform a resolve on the expression,
// and later the assign will trigger another resolution
//
// This leads to bugs (#37014)
//
if (type != null){
if (RequestedType is NewDelegate)
return RequestedType;
return this;
}
TypeExpr texpr = RequestedType.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
type = texpr.Type;
if (type == TypeManager.void_type) {
Error_VoidInvalidInTheContext (loc);
return null;
}
if (type.IsPointer) {
Report.Error (1919, loc, "Unsafe type `{0}' cannot be used in an object creation expression",
TypeManager.CSharpName (type));
return null;
}
if (Arguments == null) {
Expression c = Constantify (type);
if (c != null)
return c;
}
if (TypeManager.IsDelegateType (type)) {
RequestedType = (new NewDelegate (type, Arguments, loc)).Resolve (ec);
if (RequestedType != null)
if (!(RequestedType is DelegateCreation))
throw new Exception ("NewDelegate.Resolve returned a non NewDelegate: " + RequestedType.GetType ());
return RequestedType;
}
#if GMCS_SOURCE
if (type.IsGenericParameter) {
GenericConstraints gc = TypeManager.GetTypeParameterConstraints (type);
if ((gc == null) || (!gc.HasConstructorConstraint && !gc.IsValueType)) {
Error (304, String.Format (
"Cannot create an instance of the " +
"variable type '{0}' because it " +
"doesn't have the new() constraint",
type));
return null;
}
if ((Arguments != null) && (Arguments.Count != 0)) {
Error (417, String.Format (
"`{0}': cannot provide arguments " +
"when creating an instance of a " +
"variable type.", type));
return null;
}
is_type_parameter = true;
eclass = ExprClass.Value;
return this;
}
#endif
if (type.IsAbstract && type.IsSealed) {
Report.SymbolRelatedToPreviousError (type);
Report.Error (712, loc, "Cannot create an instance of the static class `{0}'", TypeManager.CSharpName (type));
return null;
}
if (type.IsInterface || type.IsAbstract){
if (!TypeManager.IsGenericType (type)) {
RequestedType = CheckComImport (ec);
if (RequestedType != null)
return RequestedType;
}
Report.SymbolRelatedToPreviousError (type);
Report.Error (144, loc, "Cannot create an instance of the abstract class or interface `{0}'", TypeManager.CSharpName (type));
return null;
}
bool is_struct = type.IsValueType;
eclass = ExprClass.Value;
//
// SRE returns a match for .ctor () on structs (the object constructor),
// so we have to manually ignore it.
//
if (is_struct && Arguments == null)
return this;
// For member-lookup, treat 'new Foo (bar)' as call to 'foo.ctor (bar)', where 'foo' is of type 'Foo'.
Expression ml = MemberLookupFinal (ec, type, type, ".ctor",
MemberTypes.Constructor, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
if (Arguments != null){
foreach (Argument a in Arguments){
if (!a.Resolve (ec, loc))
return null;
}
}
if (ml == null)
return null;
method = ml as MethodGroupExpr;
if (method == null) {
ml.Error_UnexpectedKind (ec.DeclContainer, "method group", loc);
return null;
}
method = method.OverloadResolve (ec, ref Arguments, false, loc);
if (method == null)
return null;
return this;
}
bool DoEmitTypeParameter (EmitContext ec)
{
#if GMCS_SOURCE
ILGenerator ig = ec.ig;
// IMemoryLocation ml;
MethodInfo ci = TypeManager.activator_create_instance.MakeGenericMethod (
new Type [] { type });
GenericConstraints gc = TypeManager.GetTypeParameterConstraints (type);
if (gc.HasReferenceTypeConstraint || gc.HasClassConstraint) {
ig.Emit (OpCodes.Call, ci);
return true;
}
// Allow DoEmit() to be called multiple times.
// We need to create a new LocalTemporary each time since
// you can't share LocalBuilders among ILGeneators.
LocalTemporary temp = new LocalTemporary (type);
Label label_activator = ig.DefineLabel ();
Label label_end = ig.DefineLabel ();
temp.AddressOf (ec, AddressOp.Store);
ig.Emit (OpCodes.Initobj, type);
temp.Emit (ec);
ig.Emit (OpCodes.Box, type);
ig.Emit (OpCodes.Brfalse, label_activator);
temp.AddressOf (ec, AddressOp.Store);
ig.Emit (OpCodes.Initobj, type);
temp.Emit (ec);
ig.Emit (OpCodes.Br, label_end);
ig.MarkLabel (label_activator);
ig.Emit (OpCodes.Call, ci);
ig.MarkLabel (label_end);
return true;
#else
throw new InternalErrorException ();
#endif
}
//
// This DoEmit can be invoked in two contexts:
// * As a mechanism that will leave a value on the stack (new object)
// * As one that wont (init struct)
//
// You can control whether a value is required on the stack by passing
// need_value_on_stack. The code *might* leave a value on the stack
// so it must be popped manually
//
// If we are dealing with a ValueType, we have a few
// situations to deal with:
//
// * The target is a ValueType, and we have been provided
// the instance (this is easy, we are being assigned).
//
// * The target of New is being passed as an argument,
// to a boxing operation or a function that takes a
// ValueType.
//
// In this case, we need to create a temporary variable
// that is the argument of New.
//
// Returns whether a value is left on the stack
//
bool DoEmit (EmitContext ec, bool need_value_on_stack)
{
bool is_value_type = TypeManager.IsValueType (type);
ILGenerator ig = ec.ig;
if (is_value_type){
IMemoryLocation ml;
// Allow DoEmit() to be called multiple times.
// We need to create a new LocalTemporary each time since
// you can't share LocalBuilders among ILGeneators.
if (!value_target_set)
value_target = new LocalTemporary (type);
ml = (IMemoryLocation) value_target;
ml.AddressOf (ec, AddressOp.Store);
}
if (method != null)
method.EmitArguments (ec, Arguments);
if (is_value_type){
if (method == null)
ig.Emit (OpCodes.Initobj, type);
else
ig.Emit (OpCodes.Call, (ConstructorInfo) method);
if (need_value_on_stack){
value_target.Emit (ec);
return true;
}
return false;
} else {
ig.Emit (OpCodes.Newobj, (ConstructorInfo) method);
return true;
}
}
public override void Emit (EmitContext ec)
{
if (is_type_parameter)
DoEmitTypeParameter (ec);
else
DoEmit (ec, true);
}
public override void EmitStatement (EmitContext ec)
{
bool value_on_stack;
if (is_type_parameter)
value_on_stack = DoEmitTypeParameter (ec);
else
value_on_stack = DoEmit (ec, false);
if (value_on_stack)
ec.ig.Emit (OpCodes.Pop);
}
public virtual bool HasInitializer {
get {
return false;
}
}
public void AddressOf (EmitContext ec, AddressOp Mode)
{
if (is_type_parameter) {
LocalTemporary temp = new LocalTemporary (type);
DoEmitTypeParameter (ec);
temp.Store (ec);
temp.AddressOf (ec, Mode);
return;
}
if (!type.IsValueType){
//
// We throw an exception. So far, I believe we only need to support
// value types:
// foreach (int j in new StructType ())
// see bug 42390
//
throw new Exception ("AddressOf should not be used for classes");
}
if (!value_target_set)
value_target = new LocalTemporary (type);
IMemoryLocation ml = (IMemoryLocation) value_target;
ml.AddressOf (ec, AddressOp.Store);
if (method == null) {
ec.ig.Emit (OpCodes.Initobj, type);
} else {
method.EmitArguments (ec, Arguments);
ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
}
((IMemoryLocation) value_target).AddressOf (ec, Mode);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
New target = (New) t;
target.RequestedType = RequestedType.Clone (clonectx);
if (Arguments != null){
target.Arguments = new ArrayList ();
foreach (Argument a in Arguments){
target.Arguments.Add (a.Clone (clonectx));
}
}
}
}
///
/// 14.5.10.2: Represents an array creation expression.
///
///
///
/// There are two possible scenarios here: one is an array creation
/// expression that specifies the dimensions and optionally the
/// initialization data and the other which does not need dimensions
/// specified but where initialization data is mandatory.
///
public class ArrayCreation : Expression {
Expression requested_base_type;
ArrayList initializers;
//
// The list of Argument types.
// This is used to construct the `newarray' or constructor signature
//
protected ArrayList arguments;
protected Type array_element_type;
bool expect_initializers = false;
int num_arguments = 0;
protected int dimensions;
protected readonly string rank;
protected ArrayList array_data;
IDictionary bounds;
// The number of constants in array initializers
int const_initializers_count;
bool only_constant_initializers;
public ArrayCreation (Expression requested_base_type, ArrayList exprs, string rank, ArrayList initializers, Location l)
{
this.requested_base_type = requested_base_type;
this.initializers = initializers;
this.rank = rank;
loc = l;
arguments = new ArrayList ();
foreach (Expression e in exprs) {
arguments.Add (new Argument (e, Argument.AType.Expression));
num_arguments++;
}
}
public ArrayCreation (Expression requested_base_type, string rank, ArrayList initializers, Location l)
{
this.requested_base_type = requested_base_type;
this.initializers = initializers;
this.rank = rank;
loc = l;
//this.rank = rank.Substring (0, rank.LastIndexOf ('['));
//
//string tmp = rank.Substring (rank.LastIndexOf ('['));
//
//dimensions = tmp.Length - 1;
expect_initializers = true;
}
public Expression FormArrayType (Expression base_type, int idx_count, string rank)
{
StringBuilder sb = new StringBuilder (rank);
sb.Append ("[");
for (int i = 1; i < idx_count; i++)
sb.Append (",");
sb.Append ("]");
return new ComposedCast (base_type, sb.ToString (), loc);
}
void Error_IncorrectArrayInitializer ()
{
Error (178, "Invalid rank specifier: expected `,' or `]'");
}
protected override void Error_NegativeArrayIndex (Location loc)
{
Report.Error (248, loc, "Cannot create an array with a negative size");
}
bool CheckIndices (EmitContext ec, ArrayList probe, int idx, bool specified_dims)
{
if (specified_dims) {
Argument a = (Argument) arguments [idx];
if (!a.Resolve (ec, loc))
return false;
Constant c = a.Expr as Constant;
if (c != null) {
c = c.ImplicitConversionRequired (TypeManager.int32_type, a.Expr.Location);
}
if (c == null) {
Report.Error (150, a.Expr.Location, "A constant value is expected");
return false;
}
int value = (int) c.GetValue ();
if (value != probe.Count) {
Error_IncorrectArrayInitializer ();
return false;
}
bounds [idx] = value;
}
int child_bounds = -1;
only_constant_initializers = true;
for (int i = 0; i < probe.Count; ++i) {
object o = probe [i];
if (o is ArrayList) {
ArrayList sub_probe = o as ArrayList;
int current_bounds = sub_probe.Count;
if (child_bounds == -1)
child_bounds = current_bounds;
else if (child_bounds != current_bounds){
Error_IncorrectArrayInitializer ();
return false;
}
if (idx + 1 >= dimensions){
Error (623, "Array initializers can only be used in a variable or field initializer. Try using a new expression instead");
return false;
}
bool ret = CheckIndices (ec, sub_probe, idx + 1, specified_dims);
if (!ret)
return false;
} else {
if (child_bounds != -1){
Error_IncorrectArrayInitializer ();
return false;
}
Expression element = ResolveArrayElement (ec, (Expression) o);
if (element == null)
continue;
// Initializers with the default values can be ignored
Constant c = element as Constant;
if (c != null) {
if (c.IsDefaultInitializer (array_element_type)) {
element = null;
}
else {
++const_initializers_count;
}
} else {
only_constant_initializers = false;
}
array_data.Add (element);
}
}
return true;
}
public override Expression CreateExpressionTree (EmitContext ec)
{
if (dimensions != 1) {
Report.Error (838, loc, "An expression tree cannot contain a multidimensional array initializer");
return null;
}
ArrayList args = new ArrayList (array_data == null ? 1 : array_data.Count + 1);
args.Add (new Argument (new TypeOf (new TypeExpression (array_element_type, loc), loc)));
if (array_data != null) {
foreach (Expression e in array_data)
args.Add (new Argument (e.CreateExpressionTree (ec)));
}
return CreateExpressionFactoryCall ("NewArrayInit", args);
}
public void UpdateIndices ()
{
int i = 0;
for (ArrayList probe = initializers; probe != null;) {
if (probe.Count > 0 && probe [0] is ArrayList) {
Expression e = new IntConstant (probe.Count, Location.Null);
arguments.Add (new Argument (e, Argument.AType.Expression));
bounds [i++] = probe.Count;
probe = (ArrayList) probe [0];
} else {
Expression e = new IntConstant (probe.Count, Location.Null);
arguments.Add (new Argument (e, Argument.AType.Expression));
bounds [i++] = probe.Count;
return;
}
}
}
protected virtual Expression ResolveArrayElement (EmitContext ec, Expression element)
{
element = element.Resolve (ec);
if (element == null)
return null;
return Convert.ImplicitConversionRequired (
ec, element, array_element_type, loc);
}
protected bool ResolveInitializers (EmitContext ec)
{
if (initializers == null) {
return !expect_initializers;
}
//
// We use this to store all the date values in the order in which we
// will need to store them in the byte blob later
//
array_data = new ArrayList ();
bounds = new System.Collections.Specialized.HybridDictionary ();
if (arguments != null)
return CheckIndices (ec, initializers, 0, true);
arguments = new ArrayList ();
if (!CheckIndices (ec, initializers, 0, false))
return false;
UpdateIndices ();
return true;
}
//
// Resolved the type of the array
//
bool ResolveArrayType (EmitContext ec)
{
if (requested_base_type == null) {
Report.Error (622, loc, "Can only use array initializer expressions to assign to array types. Try using a new expression instead");
return false;
}
StringBuilder array_qualifier = new StringBuilder (rank);
//
// `In the first form allocates an array instace of the type that results
// from deleting each of the individual expression from the expression list'
//
if (num_arguments > 0) {
array_qualifier.Append ("[");
for (int i = num_arguments-1; i > 0; i--)
array_qualifier.Append (",");
array_qualifier.Append ("]");
}
//
// Lookup the type
//
TypeExpr array_type_expr;
array_type_expr = new ComposedCast (requested_base_type, array_qualifier.ToString (), loc);
array_type_expr = array_type_expr.ResolveAsTypeTerminal (ec, false);
if (array_type_expr == null)
return false;
type = array_type_expr.Type;
array_element_type = TypeManager.GetElementType (type);
dimensions = type.GetArrayRank ();
return true;
}
public override Expression DoResolve (EmitContext ec)
{
if (type != null)
return this;
if (!ResolveArrayType (ec))
return null;
if ((array_element_type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
Report.Error (719, loc, "`{0}': array elements cannot be of static type",
TypeManager.CSharpName (array_element_type));
}
//
// First step is to validate the initializers and fill
// in any missing bits
//
if (!ResolveInitializers (ec))
return null;
if (arguments.Count != dimensions) {
Error_IncorrectArrayInitializer ();
}
foreach (Argument a in arguments){
if (!a.Resolve (ec, loc))
continue;
a.Expr = ConvertExpressionToArrayIndex (ec, a.Expr);
}
eclass = ExprClass.Value;
return this;
}
MethodInfo GetArrayMethod (int arguments)
{
ModuleBuilder mb = CodeGen.Module.Builder;
Type[] arg_types = new Type[arguments];
for (int i = 0; i < arguments; i++)
arg_types[i] = TypeManager.int32_type;
MethodInfo mi = mb.GetArrayMethod (type, ".ctor", CallingConventions.HasThis, null,
arg_types);
if (mi == null) {
Report.Error (-6, "New invocation: Can not find a constructor for " +
"this argument list");
return null;
}
return mi;
}
byte [] MakeByteBlob ()
{
int factor;
byte [] data;
byte [] element;
int count = array_data.Count;
if (array_element_type.IsEnum)
array_element_type = TypeManager.EnumToUnderlying (array_element_type);
factor = GetTypeSize (array_element_type);
if (factor == 0)
throw new Exception ("unrecognized type in MakeByteBlob: " + array_element_type);
data = new byte [(count * factor + 3) & ~3];
int idx = 0;
for (int i = 0; i < count; ++i) {
object v = array_data [i];
if (v is EnumConstant)
v = ((EnumConstant) v).Child;
if (v is Constant && !(v is StringConstant))
v = ((Constant) v).GetValue ();
else {
idx += factor;
continue;
}
if (array_element_type == TypeManager.int64_type){
if (!(v is Expression)){
long val = (long) v;
for (int j = 0; j < factor; ++j) {
data [idx + j] = (byte) (val & 0xFF);
val = (val >> 8);
}
}
} else if (array_element_type == TypeManager.uint64_type){
if (!(v is Expression)){
ulong val = (ulong) v;
for (int j = 0; j < factor; ++j) {
data [idx + j] = (byte) (val & 0xFF);
val = (val >> 8);
}
}
} else if (array_element_type == TypeManager.float_type) {
if (!(v is Expression)){
element = BitConverter.GetBytes ((float) v);
for (int j = 0; j < factor; ++j)
data [idx + j] = element [j];
if (!BitConverter.IsLittleEndian)
System.Array.Reverse (data, idx, 4);
}
} else if (array_element_type == TypeManager.double_type) {
if (!(v is Expression)){
element = BitConverter.GetBytes ((double) v);
for (int j = 0; j < factor; ++j)
data [idx + j] = element [j];
// FIXME: Handle the ARM float format.
if (!BitConverter.IsLittleEndian)
System.Array.Reverse (data, idx, 8);
}
} else if (array_element_type == TypeManager.char_type){
if (!(v is Expression)){
int val = (int) ((char) v);
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) (val >> 8);
}
} else if (array_element_type == TypeManager.short_type){
if (!(v is Expression)){
int val = (int) ((short) v);
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) (val >> 8);
}
} else if (array_element_type == TypeManager.ushort_type){
if (!(v is Expression)){
int val = (int) ((ushort) v);
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) (val >> 8);
}
} else if (array_element_type == TypeManager.int32_type) {
if (!(v is Expression)){
int val = (int) v;
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) ((val >> 8) & 0xff);
data [idx+2] = (byte) ((val >> 16) & 0xff);
data [idx+3] = (byte) (val >> 24);
}
} else if (array_element_type == TypeManager.uint32_type) {
if (!(v is Expression)){
uint val = (uint) v;
data [idx] = (byte) (val & 0xff);
data [idx+1] = (byte) ((val >> 8) & 0xff);
data [idx+2] = (byte) ((val >> 16) & 0xff);
data [idx+3] = (byte) (val >> 24);
}
} else if (array_element_type == TypeManager.sbyte_type) {
if (!(v is Expression)){
sbyte val = (sbyte) v;
data [idx] = (byte) val;
}
} else if (array_element_type == TypeManager.byte_type) {
if (!(v is Expression)){
byte val = (byte) v;
data [idx] = (byte) val;
}
} else if (array_element_type == TypeManager.bool_type) {
if (!(v is Expression)){
bool val = (bool) v;
data [idx] = (byte) (val ? 1 : 0);
}
} else if (array_element_type == TypeManager.decimal_type){
if (!(v is Expression)){
int [] bits = Decimal.GetBits ((decimal) v);
int p = idx;
// FIXME: For some reason, this doesn't work on the MS runtime.
int [] nbits = new int [4];
nbits [0] = bits [3];
nbits [1] = bits [2];
nbits [2] = bits [0];
nbits [3] = bits [1];
for (int j = 0; j < 4; j++){
data [p++] = (byte) (nbits [j] & 0xff);
data [p++] = (byte) ((nbits [j] >> 8) & 0xff);
data [p++] = (byte) ((nbits [j] >> 16) & 0xff);
data [p++] = (byte) (nbits [j] >> 24);
}
}
} else
throw new Exception ("Unrecognized type in MakeByteBlob: " + array_element_type);
idx += factor;
}
return data;
}
//
// Emits the initializers for the array
//
void EmitStaticInitializers (EmitContext ec)
{
//
// First, the static data
//
FieldBuilder fb;
ILGenerator ig = ec.ig;
byte [] data = MakeByteBlob ();
fb = RootContext.MakeStaticData (data);
ig.Emit (OpCodes.Dup);
ig.Emit (OpCodes.Ldtoken, fb);
ig.Emit (OpCodes.Call,
TypeManager.void_initializearray_array_fieldhandle);
}
//
// Emits pieces of the array that can not be computed at compile
// time (variables and string locations).
//
// This always expect the top value on the stack to be the array
//
void EmitDynamicInitializers (EmitContext ec, bool emitConstants)
{
ILGenerator ig = ec.ig;
int dims = bounds.Count;
int [] current_pos = new int [dims];
MethodInfo set = null;
if (dims != 1){
Type [] args = new Type [dims + 1];
for (int j = 0; j < dims; j++)
args [j] = TypeManager.int32_type;
args [dims] = array_element_type;
set = CodeGen.Module.Builder.GetArrayMethod (
type, "Set",
CallingConventions.HasThis | CallingConventions.Standard,
TypeManager.void_type, args);
}
for (int i = 0; i < array_data.Count; i++){
Expression e = (Expression)array_data [i];
// Constant can be initialized via StaticInitializer
if (e != null && !(!emitConstants && e is Constant)) {
Type etype = e.Type;
ig.Emit (OpCodes.Dup);
for (int idx = 0; idx < dims; idx++)
IntConstant.EmitInt (ig, current_pos [idx]);
//
// If we are dealing with a struct, get the
// address of it, so we can store it.
//
if ((dims == 1) && etype.IsValueType &&
(!TypeManager.IsBuiltinOrEnum (etype) ||
etype == TypeManager.decimal_type)) {
if (e is New){
New n = (New) e;
//
// Let new know that we are providing
// the address where to store the results
//
n.DisableTemporaryValueType ();
}
ig.Emit (OpCodes.Ldelema, etype);
}
e.Emit (ec);
if (dims == 1) {
bool is_stobj, has_type_arg;
OpCode op = ArrayAccess.GetStoreOpcode (etype, out is_stobj, out has_type_arg);
if (is_stobj)
ig.Emit (OpCodes.Stobj, etype);
else if (has_type_arg)
ig.Emit (op, etype);
else
ig.Emit (op);
} else
ig.Emit (OpCodes.Call, set);
}
//
// Advance counter
//
for (int j = dims - 1; j >= 0; j--){
current_pos [j]++;
if (current_pos [j] < (int) bounds [j])
break;
current_pos [j] = 0;
}
}
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
foreach (Argument a in arguments)
a.Emit (ec);
if (arguments.Count == 1)
ig.Emit (OpCodes.Newarr, array_element_type);
else {
ig.Emit (OpCodes.Newobj, GetArrayMethod (arguments.Count));
}
if (initializers == null)
return;
// Emit static initializer for arrays which have contain more than 4 items and
// the static initializer will initialize at least 25% of array values.
// NOTE: const_initializers_count does not contain default constant values.
if (const_initializers_count >= 4 && const_initializers_count * 4 > (array_data.Count) &&
TypeManager.IsPrimitiveType (array_element_type)) {
EmitStaticInitializers (ec);
if (!only_constant_initializers)
EmitDynamicInitializers (ec, false);
} else {
EmitDynamicInitializers (ec, true);
}
}
public override bool GetAttributableValue (Type value_type, out object value)
{
if (arguments.Count != 1) {
// Report.Error (-211, Location, "attribute can not encode multi-dimensional arrays");
return base.GetAttributableValue (null, out value);
}
if (array_data == null) {
Constant c = (Constant)((Argument)arguments [0]).Expr;
if (c.IsDefaultValue) {
value = Array.CreateInstance (array_element_type, 0);
return true;
}
// Report.Error (-212, Location, "array should be initialized when passing it to an attribute");
return base.GetAttributableValue (null, out value);
}
Array ret = Array.CreateInstance (array_element_type, array_data.Count);
object element_value;
for (int i = 0; i < ret.Length; ++i)
{
Expression e = (Expression)array_data [i];
// Is null when an initializer is optimized (value == predefined value)
if (e == null)
continue;
if (!e.GetAttributableValue (array_element_type, out element_value)) {
value = null;
return false;
}
ret.SetValue (element_value, i);
}
value = ret;
return true;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
ArrayCreation target = (ArrayCreation) t;
if (requested_base_type != null)
target.requested_base_type = requested_base_type.Clone (clonectx);
if (arguments != null){
target.arguments = new ArrayList (arguments.Count);
foreach (Argument a in arguments)
target.arguments.Add (a.Clone (clonectx));
}
if (initializers != null){
target.initializers = new ArrayList (initializers.Count);
foreach (Expression initializer in initializers)
target.initializers.Add (initializer.Clone (clonectx));
}
}
}
//
// Represents an implicitly typed array epxression
//
public class ImplicitlyTypedArrayCreation : ArrayCreation
{
public ImplicitlyTypedArrayCreation (string rank, ArrayList initializers, Location loc)
: base (null, rank, initializers, loc)
{
if (RootContext.Version <= LanguageVersion.ISO_2)
Report.FeatureIsNotAvailable (loc, "implicitly typed arrays");
if (rank.Length > 2) {
while (rank [++dimensions] == ',');
} else {
dimensions = 1;
}
}
public override Expression DoResolve (EmitContext ec)
{
if (type != null)
return this;
if (!ResolveInitializers (ec))
return null;
if (array_element_type == null || array_element_type == TypeManager.null_type ||
array_element_type == TypeManager.void_type || array_element_type == TypeManager.anonymous_method_type ||
arguments.Count != dimensions) {
Report.Error (826, loc, "The type of an implicitly typed array cannot be inferred from the initializer. Try specifying array type explicitly");
return null;
}
//
// At this point we found common base type for all initializer elements
// but we have to be sure that all static initializer elements are of
// same type
//
UnifyInitializerElement (ec);
type = TypeManager.GetConstructedType (array_element_type, rank);
eclass = ExprClass.Value;
return this;
}
//
// Converts static initializer only
//
void UnifyInitializerElement (EmitContext ec)
{
for (int i = 0; i < array_data.Count; ++i) {
Expression e = (Expression)array_data[i];
if (e != null)
array_data [i] = Convert.ImplicitConversionStandard (ec, e, array_element_type, Location.Null);
}
}
protected override Expression ResolveArrayElement (EmitContext ec, Expression element)
{
element = element.Resolve (ec);
if (element == null)
return null;
if (array_element_type == null) {
array_element_type = element.Type;
return element;
}
if (Convert.ImplicitStandardConversionExists (element, array_element_type)) {
return element;
}
if (Convert.ImplicitStandardConversionExists (new TypeExpression (array_element_type, loc), element.Type)) {
array_element_type = element.Type;
return element;
}
element.Error_ValueCannotBeConverted (ec, element.Location, array_element_type, false);
return element;
}
}
public sealed class CompilerGeneratedThis : This
{
public static This Instance = new CompilerGeneratedThis ();
private CompilerGeneratedThis ()
: base (Location.Null)
{
}
public override Expression DoResolve (EmitContext ec)
{
eclass = ExprClass.Variable;
type = ec.ContainerType;
variable = new SimpleThis (type);
return this;
}
}
///
/// Represents the `this' construct
///
public class This : VariableReference, IVariable
{
Block block;
VariableInfo variable_info;
protected Variable variable;
bool is_struct;
public This (Block block, Location loc)
{
this.loc = loc;
this.block = block;
}
public This (Location loc)
{
this.loc = loc;
}
public VariableInfo VariableInfo {
get { return variable_info; }
}
public bool VerifyFixed ()
{
return !TypeManager.IsValueType (Type);
}
public override bool IsRef {
get { return is_struct; }
}
public override Variable Variable {
get { return variable; }
}
public bool ResolveBase (EmitContext ec)
{
eclass = ExprClass.Variable;
if (ec.TypeContainer.CurrentType != null)
type = ec.TypeContainer.CurrentType;
else
type = ec.ContainerType;
is_struct = ec.TypeContainer is Struct;
if (ec.IsStatic) {
Error (26, "Keyword `this' is not valid in a static property, " +
"static method, or static field initializer");
return false;
}
if (block != null) {
if (block.Toplevel.ThisVariable != null)
variable_info = block.Toplevel.ThisVariable.VariableInfo;
AnonymousContainer am = ec.CurrentAnonymousMethod;
if (is_struct && (am != null) && !am.IsIterator) {
Report.Error (1673, loc, "Anonymous methods inside structs " +
"cannot access instance members of `this'. " +
"Consider copying `this' to a local variable " +
"outside the anonymous method and using the " +
"local instead.");
}
RootScopeInfo host = block.Toplevel.RootScope;
if ((host != null) && !ec.IsConstructor &&
(!is_struct || host.IsIterator)) {
variable = host.CaptureThis ();
type = variable.Type;
is_struct = false;
}
}
if (variable == null)
variable = new SimpleThis (type);
return true;
}
//
// Called from Invocation to check if the invocation is correct
//
public override void CheckMarshalByRefAccess (EmitContext ec)
{
if ((variable_info != null) && !(type.IsValueType && ec.OmitStructFlowAnalysis) &&
!variable_info.IsAssigned (ec)) {
Error (188, "The `this' object cannot be used before all of its " +
"fields are assigned to");
variable_info.SetAssigned (ec);
}
}
public override Expression CreateExpressionTree (EmitContext ec)
{
ArrayList args = new ArrayList (2);
args.Add (new Argument (this));
args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
return CreateExpressionFactoryCall ("Constant", args);
}
public override Expression DoResolve (EmitContext ec)
{
if (!ResolveBase (ec))
return null;
if (ec.IsInFieldInitializer) {
Error (27, "Keyword `this' is not available in the current context");
return null;
}
return this;
}
override public Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (!ResolveBase (ec))
return null;
if (variable_info != null)
variable_info.SetAssigned (ec);
if (ec.TypeContainer is Class){
Error (1604, "Cannot assign to 'this' because it is read-only");
return null;
}
return this;
}
public override int GetHashCode()
{
return block.GetHashCode ();
}
public override bool Equals (object obj)
{
This t = obj as This;
if (t == null)
return false;
return block == t.block;
}
protected class SimpleThis : Variable
{
Type type;
public SimpleThis (Type type)
{
this.type = type;
}
public override Type Type {
get { return type; }
}
public override bool HasInstance {
get { return false; }
}
public override bool NeedsTemporary {
get { return false; }
}
public override void EmitInstance (EmitContext ec)
{
// Do nothing.
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldarg_0);
}
public override void EmitAssign (EmitContext ec)
{
throw new InvalidOperationException ();
}
public override void EmitAddressOf (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldarg_0);
}
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
This target = (This) t;
target.block = clonectx.LookupBlock (block);
}
}
///
/// Represents the `__arglist' construct
///
public class ArglistAccess : Expression
{
public ArglistAccess (Location loc)
{
this.loc = loc;
}
public override Expression DoResolve (EmitContext ec)
{
eclass = ExprClass.Variable;
type = TypeManager.runtime_argument_handle_type;
if (ec.IsInFieldInitializer || !ec.CurrentBlock.Toplevel.HasVarargs)
{
Error (190, "The __arglist construct is valid only within " +
"a variable argument method");
return null;
}
return this;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Arglist);
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
// nothing.
}
}
///
/// Represents the `__arglist (....)' construct
///
public class Arglist : Expression
{
Argument[] Arguments;
public Arglist (Location loc)
: this (Argument.Empty, loc)
{
}
public Arglist (Argument[] args, Location l)
{
Arguments = args;
loc = l;
}
public Type[] ArgumentTypes {
get {
Type[] retval = new Type [Arguments.Length];
for (int i = 0; i < Arguments.Length; i++)
retval [i] = Arguments [i].Type;
return retval;
}
}
public override Expression CreateExpressionTree (EmitContext ec)
{
Report.Error (1952, loc, "An expression tree cannot contain a method with variable arguments");
return null;
}
public override Expression DoResolve (EmitContext ec)
{
eclass = ExprClass.Variable;
type = TypeManager.runtime_argument_handle_type;
foreach (Argument arg in Arguments) {
if (!arg.Resolve (ec, loc))
return null;
}
return this;
}
public override void Emit (EmitContext ec)
{
foreach (Argument arg in Arguments)
arg.Emit (ec);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Arglist target = (Arglist) t;
target.Arguments = new Argument [Arguments.Length];
for (int i = 0; i < Arguments.Length; i++)
target.Arguments [i] = Arguments [i].Clone (clonectx);
}
}
//
// This produces the value that renders an instance, used by the iterators code
//
public class ProxyInstance : Expression, IMemoryLocation {
public override Expression DoResolve (EmitContext ec)
{
eclass = ExprClass.Variable;
type = ec.ContainerType;
return this;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldarg_0);
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
ec.ig.Emit (OpCodes.Ldarg_0);
}
}
///
/// Implements the typeof operator
///
public class TypeOf : Expression {
Expression QueriedType;
protected Type typearg;
public TypeOf (Expression queried_type, Location l)
{
QueriedType = queried_type;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
typearg = texpr.Type;
if (typearg == TypeManager.void_type) {
Error (673, "System.Void cannot be used from C#. Use typeof (void) to get the void type object");
return null;
}
if (typearg.IsPointer && !ec.InUnsafe){
UnsafeError (loc);
return null;
}
type = TypeManager.type_type;
// Even though what is returned is a type object, it's treated as a value by the compiler.
// In particular, 'typeof (Foo).X' is something totally different from 'Foo.X'.
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldtoken, typearg);
ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
}
public override bool GetAttributableValue (Type value_type, out object value)
{
if (TypeManager.ContainsGenericParameters (typearg) &&
!TypeManager.IsGenericTypeDefinition (typearg)) {
Report.SymbolRelatedToPreviousError (typearg);
Report.Error (416, loc, "`{0}': an attribute argument cannot use type parameters",
TypeManager.CSharpName (typearg));
value = null;
return false;
}
if (value_type == TypeManager.object_type) {
value = (object)typearg;
return true;
}
value = typearg;
return true;
}
public Type TypeArgument
{
get
{
return typearg;
}
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
TypeOf target = (TypeOf) t;
target.QueriedType = QueriedType.Clone (clonectx);
}
}
///
/// Implements the `typeof (void)' operator
///
public class TypeOfVoid : TypeOf {
public TypeOfVoid (Location l) : base (null, l)
{
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
type = TypeManager.type_type;
typearg = TypeManager.void_type;
// See description in TypeOf.
eclass = ExprClass.Value;
return this;
}
}
internal class TypeOfMethod : Expression
{
readonly MethodGroupExpr method;
static MethodInfo get_type_from_handle;
static TypeOfMethod ()
{
get_type_from_handle = typeof (MethodBase).GetMethod ("GetMethodFromHandle",
new Type [] { TypeManager.runtime_method_handle_type });
}
public TypeOfMethod (MethodGroupExpr method)
{
this.method = method;
loc = method.Location;
}
public override Expression DoResolve (EmitContext ec)
{
type = typeof (MethodBase);
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldtoken, (MethodInfo)method);
ec.ig.Emit (OpCodes.Call, get_type_from_handle);
}
}
///
/// Implements the sizeof expression
///
public class SizeOf : Expression {
readonly Expression QueriedType;
Type type_queried;
public SizeOf (Expression queried_type, Location l)
{
this.QueriedType = queried_type;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
#if GMCS_SOURCE
if (texpr is TypeParameterExpr){
((TypeParameterExpr)texpr).Error_CannotUseAsUnmanagedType (loc);
return null;
}
#endif
type_queried = texpr.Type;
if (type_queried.IsEnum)
type_queried = TypeManager.EnumToUnderlying (type_queried);
if (type_queried == TypeManager.void_type) {
Expression.Error_VoidInvalidInTheContext (loc);
return null;
}
int size_of = GetTypeSize (type_queried);
if (size_of > 0) {
return new IntConstant (size_of, loc);
}
if (!ec.InUnsafe) {
Report.Error (233, loc, "`{0}' does not have a predefined size, therefore sizeof can only be used in an unsafe context (consider using System.Runtime.InteropServices.Marshal.SizeOf)",
TypeManager.CSharpName (type_queried));
return null;
}
if (!TypeManager.VerifyUnManaged (type_queried, loc)){
return null;
}
type = TypeManager.int32_type;
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
int size = GetTypeSize (type_queried);
if (size == 0)
ec.ig.Emit (OpCodes.Sizeof, type_queried);
else
IntConstant.EmitInt (ec.ig, size);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
}
}
///
/// Implements the qualified-alias-member (::) expression.
///
public class QualifiedAliasMember : Expression
{
string alias, identifier;
public QualifiedAliasMember (string alias, string identifier, Location l)
{
this.alias = alias;
this.identifier = identifier;
loc = l;
}
public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
{
if (alias == "global")
return new MemberAccess (RootNamespace.Global, identifier, loc).ResolveAsTypeStep (ec, silent);
int errors = Report.Errors;
FullNamedExpression fne = ec.DeclContainer.NamespaceEntry.LookupAlias (alias);
if (fne == null) {
if (errors == Report.Errors)
Report.Error (432, loc, "Alias `{0}' not found", alias);
return null;
}
if (fne.eclass != ExprClass.Namespace) {
if (!silent)
Report.Error (431, loc, "`{0}' cannot be used with '::' since it denotes a type", alias);
return null;
}
return new MemberAccess (fne, identifier).ResolveAsTypeStep (ec, silent);
}
public override Expression DoResolve (EmitContext ec)
{
FullNamedExpression fne;
if (alias == "global") {
fne = RootNamespace.Global;
} else {
int errors = Report.Errors;
fne = ec.DeclContainer.NamespaceEntry.LookupAlias (alias);
if (fne == null) {
if (errors == Report.Errors)
Report.Error (432, loc, "Alias `{0}' not found", alias);
return null;
}
}
Expression retval = new MemberAccess (fne, identifier).DoResolve (ec);
if (retval == null)
return null;
if (!(retval is FullNamedExpression)) {
Report.Error (687, loc, "The expression `{0}::{1}' did not resolve to a namespace or a type", alias, identifier);
return null;
}
// We defer this check till the end to match the behaviour of CSC
if (fne.eclass != ExprClass.Namespace) {
Report.Error (431, loc, "`{0}' cannot be used with '::' since it denotes a type", alias);
return null;
}
return retval;
}
public override void Emit (EmitContext ec)
{
throw new InternalErrorException ("QualifiedAliasMember found in resolved tree");
}
public override string ToString ()
{
return alias + "::" + identifier;
}
public override string GetSignatureForError ()
{
return ToString ();
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
// Nothing
}
}
///
/// Implements the member access expression
///
public class MemberAccess : Expression {
public readonly string Identifier;
Expression expr;
readonly TypeArguments args;
public MemberAccess (Expression expr, string id)
: this (expr, id, expr.Location)
{
}
public MemberAccess (Expression expr, string identifier, Location loc)
{
this.expr = expr;
Identifier = identifier;
this.loc = loc;
}
public MemberAccess (Expression expr, string identifier, TypeArguments args, Location loc)
: this (expr, identifier, loc)
{
this.args = args;
}
protected string LookupIdentifier {
get { return MemberName.MakeName (Identifier, args); }
}
// TODO: this method has very poor performace for Enum fields and
// probably for other constants as well
Expression DoResolve (EmitContext ec, Expression right_side)
{
if (type != null)
throw new Exception ();
//
// Resolve the expression with flow analysis turned off, we'll do the definite
// assignment checks later. This is because we don't know yet what the expression
// will resolve to - it may resolve to a FieldExpr and in this case we must do the
// definite assignment check on the actual field and not on the whole struct.
//
SimpleName original = expr as SimpleName;
Expression expr_resolved = expr.Resolve (ec,
ResolveFlags.VariableOrValue | ResolveFlags.Type |
ResolveFlags.Intermediate | ResolveFlags.DisableStructFlowAnalysis);
if (expr_resolved == null)
return null;
if (expr_resolved is Namespace) {
Namespace ns = (Namespace) expr_resolved;
FullNamedExpression retval = ns.Lookup (ec.DeclContainer, LookupIdentifier, loc);
#if GMCS_SOURCE
if ((retval != null) && (args != null))
retval = new ConstructedType (retval, args, loc).ResolveAsTypeStep (ec, false);
#endif
if (retval == null)
ns.Error_NamespaceDoesNotExist (ec.DeclContainer, loc, Identifier);
return retval;
}
Type expr_type = expr_resolved.Type;
if (expr_type.IsPointer || expr_type == TypeManager.void_type || expr_resolved is NullLiteral){
Unary.Error_OperatorCannotBeApplied (loc, ".", expr_type);
return null;
}
if (expr_type == TypeManager.anonymous_method_type){
Unary.Error_OperatorCannotBeApplied (loc, ".", "anonymous method");
return null;
}
Constant c = expr_resolved as Constant;
if (c != null && c.GetValue () == null) {
Report.Warning (1720, 1, loc, "Expression will always cause a `{0}'",
"System.NullReferenceException");
}
if (args != null) {
if (!args.Resolve (ec))
return null;
}
Expression member_lookup;
member_lookup = MemberLookup (
ec.ContainerType, expr_type, expr_type, Identifier, loc);
#if GMCS_SOURCE
if ((member_lookup == null) && (args != null)) {
member_lookup = MemberLookup (
ec.ContainerType, expr_type, expr_type, LookupIdentifier, loc);
}
#endif
if (member_lookup == null) {
ExprClass expr_eclass = expr_resolved.eclass;
//
// Extension methods are not allowed on all expression types
//
if (expr_eclass == ExprClass.Value || expr_eclass == ExprClass.Variable ||
expr_eclass == ExprClass.IndexerAccess || expr_eclass == ExprClass.PropertyAccess ||
expr_eclass == ExprClass.EventAccess) {
ExtensionMethodGroupExpr ex_method_lookup = ec.TypeContainer.LookupExtensionMethod (expr_type, Identifier);
if (ex_method_lookup != null) {
ex_method_lookup.ExtensionExpression = expr_resolved;
if (args != null) {
ex_method_lookup.SetTypeArguments (args);
}
return ex_method_lookup.DoResolve (ec);
}
}
expr = expr_resolved;
Error_MemberLookupFailed (
ec.ContainerType, expr_type, expr_type, Identifier, null,
AllMemberTypes, AllBindingFlags);
return null;
}
TypeExpr texpr = member_lookup as TypeExpr;
if (texpr != null) {
if (!(expr_resolved is TypeExpr) &&
(original == null || !original.IdenticalNameAndTypeName (ec, expr_resolved, loc))) {
Report.Error (572, loc, "`{0}': cannot reference a type through an expression; try `{1}' instead",
Identifier, member_lookup.GetSignatureForError ());
return null;
}
if (!texpr.CheckAccessLevel (ec.DeclContainer)) {
Report.SymbolRelatedToPreviousError (member_lookup.Type);
ErrorIsInaccesible (loc, TypeManager.CSharpName (member_lookup.Type));
return null;
}
#if GMCS_SOURCE
ConstructedType ct = expr_resolved as ConstructedType;
if (ct != null) {
//
// When looking up a nested type in a generic instance
// via reflection, we always get a generic type definition
// and not a generic instance - so we have to do this here.
//
// See gtest-172-lib.cs and gtest-172.cs for an example.
//
ct = new ConstructedType (
member_lookup.Type, ct.TypeArguments, loc);
return ct.ResolveAsTypeStep (ec, false);
}
#endif
return member_lookup;
}
MemberExpr me = (MemberExpr) member_lookup;
me = me.ResolveMemberAccess (ec, expr_resolved, loc, original);
if (me == null)
return null;
if (args != null) {
me.SetTypeArguments (args);
}
if (original != null && !TypeManager.IsValueType (expr_type)) {
if (me.IsInstance) {
LocalVariableReference var = expr_resolved as LocalVariableReference;
if (var != null && !var.VerifyAssigned (ec))
return null;
}
}
// The following DoResolve/DoResolveLValue will do the definite assignment
// check.
if (right_side != null)
return me.DoResolveLValue (ec, right_side);
else
return me.DoResolve (ec);
}
public override Expression DoResolve (EmitContext ec)
{
return DoResolve (ec, null);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return DoResolve (ec, right_side);
}
public override FullNamedExpression ResolveAsTypeStep (IResolveContext ec, bool silent)
{
return ResolveNamespaceOrType (ec, silent);
}
public FullNamedExpression ResolveNamespaceOrType (IResolveContext rc, bool silent)
{
FullNamedExpression new_expr = expr.ResolveAsTypeStep (rc, silent);
if (new_expr == null)
return null;
if (new_expr is Namespace) {
Namespace ns = (Namespace) new_expr;
FullNamedExpression retval = ns.Lookup (rc.DeclContainer, LookupIdentifier, loc);
#if GMCS_SOURCE
if ((retval != null) && (args != null))
retval = new ConstructedType (retval, args, loc).ResolveAsTypeStep (rc, false);
#endif
if (!silent && retval == null)
ns.Error_NamespaceDoesNotExist (rc.DeclContainer, loc, LookupIdentifier);
return retval;
}
TypeExpr tnew_expr = new_expr.ResolveAsTypeTerminal (rc, false);
if (tnew_expr == null)
return null;
Type expr_type = tnew_expr.Type;
if (expr_type.IsPointer){
Error (23, "The `.' operator can not be applied to pointer operands (" +
TypeManager.CSharpName (expr_type) + ")");
return null;
}
Expression member_lookup = MemberLookup (
rc.DeclContainer.TypeBuilder, expr_type, expr_type, LookupIdentifier,
MemberTypes.NestedType, BindingFlags.Public | BindingFlags.NonPublic, loc);
if (member_lookup == null) {
if (silent)
return null;
member_lookup = MemberLookup (
rc.DeclContainer.TypeBuilder, expr_type, expr_type, SimpleName.RemoveGenericArity (LookupIdentifier),
MemberTypes.NestedType, BindingFlags.Public | BindingFlags.NonPublic, loc);
if (member_lookup != null) {
tnew_expr = member_lookup.ResolveAsTypeTerminal (rc, false);
if (tnew_expr == null)
return null;
Namespace.Error_TypeArgumentsCannotBeUsed (tnew_expr.Type, loc);
return null;
}
member_lookup = MemberLookup (
rc.DeclContainer.TypeBuilder, expr_type, expr_type, LookupIdentifier,
MemberTypes.All, BindingFlags.Public | BindingFlags.NonPublic, loc);
if (member_lookup == null) {
Report.Error (426, loc, "The nested type `{0}' does not exist in the type `{1}'",
Identifier, new_expr.GetSignatureForError ());
} else {
// TODO: Report.SymbolRelatedToPreviousError
member_lookup.Error_UnexpectedKind (null, "type", loc);
}
return null;
}
TypeExpr texpr = member_lookup.ResolveAsTypeTerminal (rc, false);
if (texpr == null)
return null;
#if GMCS_SOURCE
TypeArguments the_args = args;
Type declaring_type = texpr.Type.DeclaringType;
if (TypeManager.HasGenericArguments (declaring_type)) {
while (!TypeManager.IsEqual (TypeManager.DropGenericTypeArguments (expr_type), declaring_type)) {
expr_type = expr_type.BaseType;
}
TypeArguments new_args = new TypeArguments (loc);
foreach (Type decl in TypeManager.GetTypeArguments (expr_type))
new_args.Add (new TypeExpression (decl, loc));
if (args != null)
new_args.Add (args);
the_args = new_args;
}
if (the_args != null) {
ConstructedType ctype = new ConstructedType (texpr.Type, the_args, loc);
return ctype.ResolveAsTypeStep (rc, false);
}
#endif
return texpr;
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should not happen");
}
protected override void Error_TypeDoesNotContainDefinition (Type type, string name)
{
if (RootContext.Version > LanguageVersion.ISO_2 &&
((expr.eclass & (ExprClass.Value | ExprClass.Variable)) != 0)) {
Report.Error (1061, loc, "Type `{0}' does not contain a definition for `{1}' and no " +
"extension method `{1}' of type `{0}' could be found " +
"(are you missing a using directive or an assembly reference?)",
TypeManager.CSharpName (type), name);
return;
}
base.Error_TypeDoesNotContainDefinition (type, name);
}
public override string ToString ()
{
return expr + "." + MemberName.MakeName (Identifier, args);
}
public override string GetSignatureForError ()
{
return expr.GetSignatureForError () + "." + Identifier;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
MemberAccess target = (MemberAccess) t;
target.expr = expr.Clone (clonectx);
}
}
///
/// Implements checked expressions
///
public class CheckedExpr : Expression {
public Expression Expr;
public CheckedExpr (Expression e, Location l)
{
Expr = e;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
if (Expr is Constant)
return Expr;
eclass = Expr.eclass;
type = Expr.Type;
return this;
}
public override void Emit (EmitContext ec)
{
using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
Expr.Emit (ec);
}
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
using (ec.With (EmitContext.Flags.AllCheckStateFlags, true))
Expr.EmitBranchable (ec, target, on_true);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
CheckedExpr target = (CheckedExpr) t;
target.Expr = Expr.Clone (clonectx);
}
}
///
/// Implements the unchecked expression
///
public class UnCheckedExpr : Expression {
public Expression Expr;
public UnCheckedExpr (Expression e, Location l)
{
Expr = e;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
if (Expr is Constant)
return Expr;
eclass = Expr.eclass;
type = Expr.Type;
return this;
}
public override void Emit (EmitContext ec)
{
using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
Expr.Emit (ec);
}
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
using (ec.With (EmitContext.Flags.AllCheckStateFlags, false))
Expr.EmitBranchable (ec, target, on_true);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
UnCheckedExpr target = (UnCheckedExpr) t;
target.Expr = Expr.Clone (clonectx);
}
}
///
/// An Element Access expression.
///
/// During semantic analysis these are transformed into
/// IndexerAccess, ArrayAccess or a PointerArithmetic.
///
public class ElementAccess : Expression {
public ArrayList Arguments;
public Expression Expr;
public ElementAccess (Expression e, ArrayList e_list)
{
Expr = e;
loc = e.Location;
if (e_list == null)
return;
Arguments = new ArrayList ();
foreach (Expression tmp in e_list)
Arguments.Add (new Argument (tmp, Argument.AType.Expression));
}
bool CommonResolve (EmitContext ec)
{
Expr = Expr.Resolve (ec);
if (Arguments == null)
return false;
foreach (Argument a in Arguments){
if (!a.Resolve (ec, loc))
return false;
}
return Expr != null;
}
public override Expression CreateExpressionTree (EmitContext ec)
{
ArrayList args = new ArrayList (Arguments.Count + 1);
args.Add (new Argument (Expr.CreateExpressionTree (ec)));
foreach (Argument a in Arguments)
args.Add (new Argument (a.Expr.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall ("ArrayIndex", args);
}
Expression MakePointerAccess (EmitContext ec, Type t)
{
if (t == TypeManager.void_ptr_type){
Error (242, "The array index operation is not valid on void pointers");
return null;
}
if (Arguments.Count != 1){
Error (196, "A pointer must be indexed by only one value");
return null;
}
Expression p;
p = new PointerArithmetic (true, Expr, ((Argument)Arguments [0]).Expr, t, loc).Resolve (ec);
if (p == null)
return null;
return new Indirection (p, loc).Resolve (ec);
}
public override Expression DoResolve (EmitContext ec)
{
if (!CommonResolve (ec))
return null;
//
// We perform some simple tests, and then to "split" the emit and store
// code we create an instance of a different class, and return that.
//
// I am experimenting with this pattern.
//
Type t = Expr.Type;
if (t == TypeManager.array_type){
Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `System.Array'");
return null;
}
if (t.IsArray)
return (new ArrayAccess (this, loc)).Resolve (ec);
if (t.IsPointer)
return MakePointerAccess (ec, t);
FieldExpr fe = Expr as FieldExpr;
if (fe != null) {
IFixedBuffer ff = AttributeTester.GetFixedBuffer (fe.FieldInfo);
if (ff != null) {
return MakePointerAccess (ec, ff.ElementType);
}
}
return (new IndexerAccess (this, loc)).Resolve (ec);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (!CommonResolve (ec))
return null;
type = Expr.Type;
if (type.IsArray)
return (new ArrayAccess (this, loc)).DoResolveLValue (ec, right_side);
if (type.IsPointer)
return MakePointerAccess (ec, type);
if (Expr.eclass != ExprClass.Variable && type.IsValueType)
Error_CannotModifyIntermediateExpressionValue (ec);
return (new IndexerAccess (this, loc)).DoResolveLValue (ec, right_side);
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should never be reached");
}
public override string GetSignatureForError ()
{
return Expr.GetSignatureForError ();
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
ElementAccess target = (ElementAccess) t;
target.Expr = Expr.Clone (clonectx);
target.Arguments = new ArrayList (Arguments.Count);
foreach (Argument a in Arguments)
target.Arguments.Add (a.Clone (clonectx));
}
}
///
/// Implements array access
///
public class ArrayAccess : Expression, IAssignMethod, IMemoryLocation {
//
// Points to our "data" repository
//
ElementAccess ea;
LocalTemporary temp;
LocalTemporary prepared_value;
bool prepared;
public ArrayAccess (ElementAccess ea_data, Location l)
{
ea = ea_data;
eclass = ExprClass.Variable;
loc = l;
}
public override Expression CreateExpressionTree (EmitContext ec)
{
return ea.CreateExpressionTree (ec);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return DoResolve (ec);
}
public override Expression DoResolve (EmitContext ec)
{
#if false
ExprClass eclass = ea.Expr.eclass;
// As long as the type is valid
if (!(eclass == ExprClass.Variable || eclass == ExprClass.PropertyAccess ||
eclass == ExprClass.Value)) {
ea.Expr.Error_UnexpectedKind ("variable or value");
return null;
}
#endif
Type t = ea.Expr.Type;
if (t.GetArrayRank () != ea.Arguments.Count) {
Report.Error (22, ea.Location, "Wrong number of indexes `{0}' inside [], expected `{1}'",
ea.Arguments.Count.ToString (), t.GetArrayRank ().ToString ());
return null;
}
type = TypeManager.GetElementType (t);
if (type.IsPointer && !ec.InUnsafe) {
UnsafeError (ea.Location);
return null;
}
foreach (Argument a in ea.Arguments) {
a.Expr = ConvertExpressionToArrayIndex (ec, a.Expr);
}
eclass = ExprClass.Variable;
return this;
}
///
/// Emits the right opcode to load an object of Type `t'
/// from an array of T
///
void EmitLoadOpcode (ILGenerator ig, Type type, int rank)
{
if (rank > 1) {
MethodInfo get = FetchGetMethod ();
ig.Emit (OpCodes.Call, get);
return;
}
if (type == TypeManager.byte_type || type == TypeManager.bool_type)
ig.Emit (OpCodes.Ldelem_U1);
else if (type == TypeManager.sbyte_type)
ig.Emit (OpCodes.Ldelem_I1);
else if (type == TypeManager.short_type)
ig.Emit (OpCodes.Ldelem_I2);
else if (type == TypeManager.ushort_type || type == TypeManager.char_type)
ig.Emit (OpCodes.Ldelem_U2);
else if (type == TypeManager.int32_type)
ig.Emit (OpCodes.Ldelem_I4);
else if (type == TypeManager.uint32_type)
ig.Emit (OpCodes.Ldelem_U4);
else if (type == TypeManager.uint64_type)
ig.Emit (OpCodes.Ldelem_I8);
else if (type == TypeManager.int64_type)
ig.Emit (OpCodes.Ldelem_I8);
else if (type == TypeManager.float_type)
ig.Emit (OpCodes.Ldelem_R4);
else if (type == TypeManager.double_type)
ig.Emit (OpCodes.Ldelem_R8);
else if (type == TypeManager.intptr_type)
ig.Emit (OpCodes.Ldelem_I);
else if (TypeManager.IsEnumType (type)){
EmitLoadOpcode (ig, TypeManager.EnumToUnderlying (type), rank);
} else if (type.IsValueType){
ig.Emit (OpCodes.Ldelema, type);
ig.Emit (OpCodes.Ldobj, type);
#if GMCS_SOURCE
} else if (type.IsGenericParameter) {
ig.Emit (OpCodes.Ldelem, type);
#endif
} else if (type.IsPointer)
ig.Emit (OpCodes.Ldelem_I);
else
ig.Emit (OpCodes.Ldelem_Ref);
}
protected override void Error_NegativeArrayIndex (Location loc)
{
Report.Warning (251, 2, loc, "Indexing an array with a negative index (array indices always start at zero)");
}
///
/// Returns the right opcode to store an object of Type `t'
/// from an array of T.
///
static public OpCode GetStoreOpcode (Type t, out bool is_stobj, out bool has_type_arg)
{
//Console.WriteLine (new System.Diagnostics.StackTrace ());
has_type_arg = false; is_stobj = false;
t = TypeManager.TypeToCoreType (t);
if (TypeManager.IsEnumType (t))
t = TypeManager.EnumToUnderlying (t);
if (t == TypeManager.byte_type || t == TypeManager.sbyte_type ||
t == TypeManager.bool_type)
return OpCodes.Stelem_I1;
else if (t == TypeManager.short_type || t == TypeManager.ushort_type ||
t == TypeManager.char_type)
return OpCodes.Stelem_I2;
else if (t == TypeManager.int32_type || t == TypeManager.uint32_type)
return OpCodes.Stelem_I4;
else if (t == TypeManager.int64_type || t == TypeManager.uint64_type)
return OpCodes.Stelem_I8;
else if (t == TypeManager.float_type)
return OpCodes.Stelem_R4;
else if (t == TypeManager.double_type)
return OpCodes.Stelem_R8;
else if (t == TypeManager.intptr_type) {
has_type_arg = true;
is_stobj = true;
return OpCodes.Stobj;
} else if (t.IsValueType) {
has_type_arg = true;
is_stobj = true;
return OpCodes.Stobj;
#if GMCS_SOURCE
} else if (t.IsGenericParameter) {
has_type_arg = true;
return OpCodes.Stelem;
#endif
} else if (t.IsPointer)
return OpCodes.Stelem_I;
else
return OpCodes.Stelem_Ref;
}
MethodInfo FetchGetMethod ()
{
ModuleBuilder mb = CodeGen.Module.Builder;
int arg_count = ea.Arguments.Count;
Type [] args = new Type [arg_count];
MethodInfo get;
for (int i = 0; i < arg_count; i++){
//args [i++] = a.Type;
args [i] = TypeManager.int32_type;
}
get = mb.GetArrayMethod (
ea.Expr.Type, "Get",
CallingConventions.HasThis |
CallingConventions.Standard,
type, args);
return get;
}
MethodInfo FetchAddressMethod ()
{
ModuleBuilder mb = CodeGen.Module.Builder;
int arg_count = ea.Arguments.Count;
Type [] args = new Type [arg_count];
MethodInfo address;
Type ret_type;
ret_type = TypeManager.GetReferenceType (type);
for (int i = 0; i < arg_count; i++){
//args [i++] = a.Type;
args [i] = TypeManager.int32_type;
}
address = mb.GetArrayMethod (
ea.Expr.Type, "Address",
CallingConventions.HasThis |
CallingConventions.Standard,
ret_type, args);
return address;
}
//
// Load the array arguments into the stack.
//
// If we have been requested to cache the values (cached_locations array
// initialized), then load the arguments the first time and store them
// in locals. otherwise load from local variables.
//
// prepare_for_load is used in compound assignments to cache original index
// values ( label[idx++] += s )
//
LocalTemporary [] LoadArrayAndArguments (EmitContext ec, bool prepare_for_load)
{
ea.Expr.Emit (ec);
LocalTemporary[] indexes = null;
if (prepare_for_load) {
ec.ig.Emit (OpCodes.Dup);
indexes = new LocalTemporary [ea.Arguments.Count];
}
for (int i = 0; i < ea.Arguments.Count; ++i) {
((Argument)ea.Arguments [i]).Emit (ec);
if (!prepare_for_load)
continue;
// Keep original array index value on the stack
ec.ig.Emit (OpCodes.Dup);
indexes [i] = new LocalTemporary (TypeManager.intptr_type);
indexes [i].Store (ec);
}
return indexes;
}
public void Emit (EmitContext ec, bool leave_copy)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
if (prepared_value != null) {
prepared_value.Emit (ec);
} else if (prepared) {
LoadFromPtr (ig, this.type);
} else {
LoadArrayAndArguments (ec, false);
EmitLoadOpcode (ig, type, rank);
}
if (leave_copy) {
ig.Emit (OpCodes.Dup);
temp = new LocalTemporary (this.type);
temp.Store (ec);
}
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
Type t = source.Type;
prepared = prepare_for_load && !(source is StringConcat);
if (prepared) {
AddressOf (ec, AddressOp.LoadStore);
ec.ig.Emit (OpCodes.Dup);
} else {
LocalTemporary[] original_indexes_values = LoadArrayAndArguments (ec,
prepare_for_load && (source is StringConcat));
if (original_indexes_values != null) {
prepared_value = new LocalTemporary (type);
EmitLoadOpcode (ig, type, rank);
prepared_value.Store (ec);
foreach (LocalTemporary lt in original_indexes_values) {
lt.Emit (ec);
lt.Release (ec);
}
}
}
if (rank == 1) {
bool is_stobj, has_type_arg;
OpCode op = GetStoreOpcode (t, out is_stobj, out has_type_arg);
if (!prepared) {
//
// The stobj opcode used by value types will need
// an address on the stack, not really an array/array
// pair
//
if (is_stobj)
ig.Emit (OpCodes.Ldelema, t);
}
source.Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
temp = new LocalTemporary (this.type);
temp.Store (ec);
}
if (prepared)
StoreFromPtr (ig, t);
else if (is_stobj)
ig.Emit (OpCodes.Stobj, t);
else if (has_type_arg)
ig.Emit (op, t);
else
ig.Emit (op);
} else {
source.Emit (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
temp = new LocalTemporary (this.type);
temp.Store (ec);
}
if (prepared) {
StoreFromPtr (ig, t);
} else {
int arg_count = ea.Arguments.Count;
Type [] args = new Type [arg_count + 1];
for (int i = 0; i < arg_count; i++) {
//args [i++] = a.Type;
args [i] = TypeManager.int32_type;
}
args [arg_count] = type;
MethodInfo set = CodeGen.Module.Builder.GetArrayMethod (
ea.Expr.Type, "Set",
CallingConventions.HasThis |
CallingConventions.Standard,
TypeManager.void_type, args);
ig.Emit (OpCodes.Call, set);
}
}
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
}
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
LoadArrayAndArguments (ec, false);
if (rank == 1){
ig.Emit (OpCodes.Ldelema, type);
} else {
MethodInfo address = FetchAddressMethod ();
ig.Emit (OpCodes.Call, address);
}
}
public void EmitGetLength (EmitContext ec, int dim)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
ea.Expr.Emit (ec);
if (rank == 1) {
ig.Emit (OpCodes.Ldlen);
ig.Emit (OpCodes.Conv_I4);
} else {
IntLiteral.EmitInt (ig, dim);
ig.Emit (OpCodes.Callvirt, TypeManager.int_getlength_int);
}
}
}
///
/// Expressions that represent an indexer call.
///
public class IndexerAccess : Expression, IAssignMethod
{
class IndexerMethodGroupExpr : MethodGroupExpr
{
public IndexerMethodGroupExpr (Indexers indexers, Location loc)
: base (null, loc)
{
Methods = (MethodBase []) indexers.Methods.ToArray (typeof (MethodBase));
}
public override string Name {
get {
return "this";
}
}
protected override int GetApplicableParametersCount (MethodBase method, ParameterData parameters)
{
//
// Here is the trick, decrease number of arguments by 1 when only
// available property method is setter. This makes overload resolution
// work correctly for indexers.
//
if (method.Name [0] == 'g')
return parameters.Count;
return parameters.Count - 1;
}
}
class Indexers
{
// Contains either property getter or setter
public ArrayList Methods;
public ArrayList Properties;
Indexers ()
{
}
void Append (Type caller_type, MemberInfo [] mi)
{
if (mi == null)
return;
foreach (PropertyInfo property in mi) {
MethodInfo accessor = property.GetGetMethod (true);
if (accessor == null)
accessor = property.GetSetMethod (true);
if (Methods == null) {
Methods = new ArrayList ();
Properties = new ArrayList ();
}
Methods.Add (accessor);
Properties.Add (property);
}
}
static MemberInfo [] GetIndexersForTypeOrInterface (Type caller_type, Type lookup_type)
{
string p_name = TypeManager.IndexerPropertyName (lookup_type);
return TypeManager.MemberLookup (
caller_type, caller_type, lookup_type, MemberTypes.Property,
BindingFlags.Public | BindingFlags.Instance |
BindingFlags.DeclaredOnly, p_name, null);
}
public static Indexers GetIndexersForType (Type caller_type, Type lookup_type)
{
Indexers ix = new Indexers ();
#if GMCS_SOURCE
if (lookup_type.IsGenericParameter) {
GenericConstraints gc = TypeManager.GetTypeParameterConstraints (lookup_type);
if (gc == null)
return ix;
if (gc.HasClassConstraint)
ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, gc.ClassConstraint));
Type[] ifaces = gc.InterfaceConstraints;
foreach (Type itype in ifaces)
ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, itype));
return ix;
}
#endif
Type copy = lookup_type;
while (copy != TypeManager.object_type && copy != null){
ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, copy));
copy = copy.BaseType;
}
if (lookup_type.IsInterface) {
Type [] ifaces = TypeManager.GetInterfaces (lookup_type);
if (ifaces != null) {
foreach (Type itype in ifaces)
ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, itype));
}
}
return ix;
}
}
enum AccessorType
{
Get,
Set
}
//
// Points to our "data" repository
//
MethodInfo get, set;
bool is_base_indexer;
bool prepared;
LocalTemporary temp;
LocalTemporary prepared_value;
Expression set_expr;
protected Type indexer_type;
protected Type current_type;
protected Expression instance_expr;
protected ArrayList arguments;
public IndexerAccess (ElementAccess ea, Location loc)
: this (ea.Expr, false, loc)
{
this.arguments = ea.Arguments;
}
protected IndexerAccess (Expression instance_expr, bool is_base_indexer,
Location loc)
{
this.instance_expr = instance_expr;
this.is_base_indexer = is_base_indexer;
this.eclass = ExprClass.Value;
this.loc = loc;
}
static string GetAccessorName (AccessorType at)
{
if (at == AccessorType.Set)
return "set";
if (at == AccessorType.Get)
return "get";
throw new NotImplementedException (at.ToString ());
}
protected virtual bool CommonResolve (EmitContext ec)
{
indexer_type = instance_expr.Type;
current_type = ec.ContainerType;
return true;
}
public override Expression DoResolve (EmitContext ec)
{
return ResolveAccessor (ec, AccessorType.Get);
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
if (right_side == EmptyExpression.OutAccess) {
Report.Error (206, loc, "A property or indexer `{0}' may not be passed as an out or ref parameter",
GetSignatureForError ());
return null;
}
// if the indexer returns a value type, and we try to set a field in it
if (right_side == EmptyExpression.LValueMemberAccess || right_side == EmptyExpression.LValueMemberOutAccess) {
Error_CannotModifyIntermediateExpressionValue (ec);
}
Expression e = ResolveAccessor (ec, AccessorType.Set);
if (e == null)
return null;
set_expr = Convert.ImplicitConversion (ec, right_side, type, loc);
return e;
}
Expression ResolveAccessor (EmitContext ec, AccessorType accessorType)
{
if (!CommonResolve (ec))
return null;
Indexers ilist = Indexers.GetIndexersForType (current_type, indexer_type);
if (ilist.Methods == null) {
Report.Error (21, loc, "Cannot apply indexing with [] to an expression of type `{0}'",
TypeManager.CSharpName (indexer_type));
return null;
}
MethodGroupExpr mg = new IndexerMethodGroupExpr (ilist, loc);
mg = mg.OverloadResolve (ec, ref arguments, false, loc);
if (mg == null)
return null;
MethodInfo mi = (MethodInfo) mg;
PropertyInfo pi = null;
for (int i = 0; i < ilist.Methods.Count; ++i) {
if (ilist.Methods [i] == mi) {
pi = (PropertyInfo) ilist.Properties [i];
break;
}
}
type = pi.PropertyType;
if (type.IsPointer && !ec.InUnsafe)
UnsafeError (loc);
MethodInfo accessor;
if (accessorType == AccessorType.Get) {
accessor = get = pi.GetGetMethod (true);
} else {
accessor = set = pi.GetSetMethod (true);
if (accessor == null && pi.GetGetMethod (true) != null) {
Report.SymbolRelatedToPreviousError (pi);
Report.Error (200, loc, "The read only property or indexer `{0}' cannot be assigned to",
TypeManager.GetFullNameSignature (pi));
return null;
}
}
if (accessor == null) {
Report.SymbolRelatedToPreviousError (pi);
Report.Error (154, loc, "The property or indexer `{0}' cannot be used in this context because it lacks a `{1}' accessor",
TypeManager.GetFullNameSignature (pi), GetAccessorName (accessorType));
return null;
}
//
// Only base will allow this invocation to happen.
//
if (accessor.IsAbstract && this is BaseIndexerAccess) {
Error_CannotCallAbstractBase (TypeManager.GetFullNameSignature (pi));
}
bool must_do_cs1540_check;
if (!IsAccessorAccessible (ec.ContainerType, accessor, out must_do_cs1540_check)) {
if (set == null)
set = pi.GetSetMethod (true);
else
get = pi.GetGetMethod (true);
if (set != null && get != null &&
(set.Attributes & MethodAttributes.MemberAccessMask) != (get.Attributes & MethodAttributes.MemberAccessMask)) {
Report.SymbolRelatedToPreviousError (accessor);
Report.Error (271, loc, "The property or indexer `{0}' cannot be used in this context because a `{1}' accessor is inaccessible",
TypeManager.GetFullNameSignature (pi), GetAccessorName (accessorType));
} else {
Report.SymbolRelatedToPreviousError (pi);
ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (pi));
}
}
instance_expr.CheckMarshalByRefAccess (ec);
eclass = ExprClass.IndexerAccess;
return this;
}
public void Emit (EmitContext ec, bool leave_copy)
{
if (prepared) {
prepared_value.Emit (ec);
} else {
Invocation.EmitCall (ec, is_base_indexer, instance_expr, get,
arguments, loc, false, false);
}
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
temp = new LocalTemporary (Type);
temp.Store (ec);
}
}
//
// source is ignored, because we already have a copy of it from the
// LValue resolution and we have already constructed a pre-cached
// version of the arguments (ea.set_arguments);
//
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy, bool prepare_for_load)
{
prepared = prepare_for_load;
Expression value = set_expr;
if (prepared) {
Invocation.EmitCall (ec, is_base_indexer, instance_expr, get,
arguments, loc, true, false);
prepared_value = new LocalTemporary (type);
prepared_value.Store (ec);
source.Emit (ec);
prepared_value.Release (ec);
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
temp = new LocalTemporary (Type);
temp.Store (ec);
}
} else if (leave_copy) {
temp = new LocalTemporary (Type);
source.Emit (ec);
temp.Store (ec);
value = temp;
}
arguments.Add (new Argument (value, Argument.AType.Expression));
Invocation.EmitCall (ec, is_base_indexer, instance_expr, set, arguments, loc, false, prepared);
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
}
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
public override string GetSignatureForError ()
{
return TypeManager.CSharpSignature (get != null ? get : set, false);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
IndexerAccess target = (IndexerAccess) t;
if (arguments != null){
target.arguments = new ArrayList ();
foreach (Argument a in arguments)
target.arguments.Add (a.Clone (clonectx));
}
if (instance_expr != null)
target.instance_expr = instance_expr.Clone (clonectx);
}
}
///
/// The base operator for method names
///
public class BaseAccess : Expression {
public readonly string Identifier;
TypeArguments args;
public BaseAccess (string member, Location l)
{
this.Identifier = member;
loc = l;
}
public BaseAccess (string member, TypeArguments args, Location l)
: this (member, l)
{
this.args = args;
}
public override Expression DoResolve (EmitContext ec)
{
Expression c = CommonResolve (ec);
if (c == null)
return null;
//
// MethodGroups use this opportunity to flag an error on lacking ()
//
if (!(c is MethodGroupExpr))
return c.Resolve (ec);
return c;
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
Expression c = CommonResolve (ec);
if (c == null)
return null;
//
// MethodGroups use this opportunity to flag an error on lacking ()
//
if (! (c is MethodGroupExpr))
return c.DoResolveLValue (ec, right_side);
return c;
}
Expression CommonResolve (EmitContext ec)
{
Expression member_lookup;
Type current_type = ec.ContainerType;
Type base_type = current_type.BaseType;
if (ec.IsStatic){
Error (1511, "Keyword `base' is not available in a static method");
return null;
}
if (ec.IsInFieldInitializer){
Error (1512, "Keyword `base' is not available in the current context");
return null;
}
member_lookup = MemberLookup (ec.ContainerType, null, base_type, Identifier,
AllMemberTypes, AllBindingFlags, loc);
if (member_lookup == null) {
Error_MemberLookupFailed (ec.ContainerType, base_type, base_type, Identifier,
null, AllMemberTypes, AllBindingFlags);
return null;
}
Expression left;
if (ec.IsStatic)
left = new TypeExpression (base_type, loc);
else
left = ec.GetThis (loc);
MemberExpr me = (MemberExpr) member_lookup;
me = me.ResolveMemberAccess (ec, left, loc, null);
if (me == null)
return null;
me.IsBase = true;
if (args != null) {
args.Resolve (ec);
me.SetTypeArguments (args);
}
return me;
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should never be called");
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
BaseAccess target = (BaseAccess) t;
if (args != null)
target.args = args.Clone ();
}
}
///
/// The base indexer operator
///
public class BaseIndexerAccess : IndexerAccess {
public BaseIndexerAccess (ArrayList args, Location loc)
: base (null, true, loc)
{
arguments = new ArrayList ();
foreach (Expression tmp in args)
arguments.Add (new Argument (tmp, Argument.AType.Expression));
}
protected override bool CommonResolve (EmitContext ec)
{
instance_expr = ec.GetThis (loc);
current_type = ec.ContainerType.BaseType;
indexer_type = current_type;
foreach (Argument a in arguments){
if (!a.Resolve (ec, loc))
return false;
}
return true;
}
}
///
/// This class exists solely to pass the Type around and to be a dummy
/// that can be passed to the conversion functions (this is used by
/// foreach implementation to typecast the object return value from
/// get_Current into the proper type. All code has been generated and
/// we only care about the side effect conversions to be performed
///
/// This is also now used as a placeholder where a no-action expression
/// is needed (the `New' class).
///
public class EmptyExpression : Expression {
public static readonly EmptyExpression Null = new EmptyExpression ();
public static readonly EmptyExpression OutAccess = new EmptyExpression ();
public static readonly EmptyExpression LValueMemberAccess = new EmptyExpression ();
public static readonly EmptyExpression LValueMemberOutAccess = new EmptyExpression ();
static EmptyExpression temp = new EmptyExpression ();
public static EmptyExpression Grab ()
{
EmptyExpression retval = temp == null ? new EmptyExpression () : temp;
temp = null;
return retval;
}
public static void Release (EmptyExpression e)
{
temp = e;
}
// TODO: should be protected
public EmptyExpression ()
{
type = TypeManager.object_type;
eclass = ExprClass.Value;
loc = Location.Null;
}
public EmptyExpression (Type t)
{
type = t;
eclass = ExprClass.Value;
loc = Location.Null;
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public override void Emit (EmitContext ec)
{
// nothing, as we only exist to not do anything.
}
//
// This is just because we might want to reuse this bad boy
// instead of creating gazillions of EmptyExpressions.
// (CanImplicitConversion uses it)
//
public void SetType (Type t)
{
type = t;
}
}
//
// Empty statement expression
//
public sealed class EmptyExpressionStatement : ExpressionStatement
{
public static readonly EmptyExpressionStatement Instance = new EmptyExpressionStatement ();
private EmptyExpressionStatement ()
{
type = TypeManager.object_type;
eclass = ExprClass.Value;
loc = Location.Null;
}
public override void EmitStatement (EmitContext ec)
{
// Do nothing
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public override void Emit (EmitContext ec)
{
// Do nothing
}
}
public class UserCast : Expression {
MethodBase method;
Expression source;
public UserCast (MethodInfo method, Expression source, Location l)
{
this.method = method;
this.source = source;
type = method.ReturnType;
eclass = ExprClass.Value;
loc = l;
}
public Expression Source {
get {
return source;
}
}
public override Expression DoResolve (EmitContext ec)
{
//
// We are born fully resolved
//
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
source.Emit (ec);
if (method is MethodInfo)
ig.Emit (OpCodes.Call, (MethodInfo) method);
else
ig.Emit (OpCodes.Call, (ConstructorInfo) method);
}
}
//
// This class is used to "construct" the type during a typecast
// operation. Since the Type.GetType class in .NET can parse
// the type specification, we just use this to construct the type
// one bit at a time.
//
public class ComposedCast : TypeExpr {
Expression left;
string dim;
public ComposedCast (Expression left, string dim)
: this (left, dim, left.Location)
{
}
public ComposedCast (Expression left, string dim, Location l)
{
this.left = left;
this.dim = dim;
loc = l;
}
public Expression RemoveNullable ()
{
if (dim.EndsWith ("?")) {
dim = dim.Substring (0, dim.Length - 1);
if (dim.Length == 0)
return left;
}
return this;
}
protected override TypeExpr DoResolveAsTypeStep (IResolveContext ec)
{
TypeExpr lexpr = left.ResolveAsTypeTerminal (ec, false);
if (lexpr == null)
return null;
Type ltype = lexpr.Type;
if ((ltype == TypeManager.void_type) && (dim != "*")) {
Error_VoidInvalidInTheContext (loc);
return null;
}
#if GMCS_SOURCE
if ((dim.Length > 0) && (dim [0] == '?')) {
TypeExpr nullable = new NullableType (left, loc);
if (dim.Length > 1)
nullable = new ComposedCast (nullable, dim.Substring (1), loc);
return nullable.ResolveAsTypeTerminal (ec, false);
}
#endif
if (dim == "*" && !TypeManager.VerifyUnManaged (ltype, loc))
return null;
if (dim != "" && dim [0] == '[' &&
(ltype == TypeManager.arg_iterator_type || ltype == TypeManager.typed_reference_type)) {
Report.Error (611, loc, "Array elements cannot be of type `{0}'", TypeManager.CSharpName (ltype));
return null;
}
if (dim != "")
type = TypeManager.GetConstructedType (ltype, dim);
else
type = ltype;
if (type == null)
throw new InternalErrorException ("Couldn't create computed type " + ltype + dim);
if (type.IsPointer && !ec.IsInUnsafeScope){
UnsafeError (loc);
return null;
}
eclass = ExprClass.Type;
return this;
}
public override string Name {
get { return left + dim; }
}
public override string FullName {
get { return type.FullName; }
}
public override string GetSignatureForError ()
{
return left.GetSignatureForError () + dim;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
ComposedCast target = (ComposedCast) t;
target.left = left.Clone (clonectx);
}
}
public class FixedBufferPtr : Expression {
Expression array;
public FixedBufferPtr (Expression array, Type array_type, Location l)
{
this.array = array;
this.loc = l;
type = TypeManager.GetPointerType (array_type);
eclass = ExprClass.Value;
}
public override void Emit(EmitContext ec)
{
array.Emit (ec);
}
public override Expression DoResolve (EmitContext ec)
{
//
// We are born fully resolved
//
return this;
}
}
//
// This class is used to represent the address of an array, used
// only by the Fixed statement, this generates "&a [0]" construct
// for fixed (char *pa = a)
//
public class ArrayPtr : FixedBufferPtr {
Type array_type;
public ArrayPtr (Expression array, Type array_type, Location l):
base (array, array_type, l)
{
this.array_type = array_type;
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
ILGenerator ig = ec.ig;
IntLiteral.EmitInt (ig, 0);
ig.Emit (OpCodes.Ldelema, array_type);
}
}
//
// Encapsulates a conversion rules required for array indexes
//
public class ArrayIndexCast : Expression
{
Expression expr;
public ArrayIndexCast (Expression expr)
{
this.expr = expr;
this.loc = expr.Location;
}
public override Expression CreateExpressionTree (EmitContext ec)
{
ArrayList args = new ArrayList (2);
args.Add (new Argument (expr.CreateExpressionTree (ec)));
args.Add (new Argument (new TypeOf (new TypeExpression (TypeManager.int32_type, loc), loc)));
return CreateExpressionFactoryCall ("ConvertChecked", args);
}
public override Expression DoResolve (EmitContext ec)
{
type = expr.Type;
eclass = expr.eclass;
return this;
}
public override void Emit (EmitContext ec)
{
expr.Emit (ec);
if (type == TypeManager.int32_type)
return;
if (type == TypeManager.uint32_type)
ec.ig.Emit (OpCodes.Conv_U);
else if (type == TypeManager.int64_type)
ec.ig.Emit (OpCodes.Conv_Ovf_I);
else if (type == TypeManager.uint64_type)
ec.ig.Emit (OpCodes.Conv_Ovf_I_Un);
else
throw new InternalErrorException ("Cannot emit cast to unknown array element type", type);
}
}
//
// Used by the fixed statement
//
public class StringPtr : Expression {
LocalBuilder b;
public StringPtr (LocalBuilder b, Location l)
{
this.b = b;
eclass = ExprClass.Value;
type = TypeManager.char_ptr_type;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
// This should never be invoked, we are born in fully
// initialized state.
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
ig.Emit (OpCodes.Ldloc, b);
ig.Emit (OpCodes.Conv_I);
ig.Emit (OpCodes.Call, TypeManager.int_get_offset_to_string_data);
ig.Emit (OpCodes.Add);
}
}
//
// Implements the `stackalloc' keyword
//
public class StackAlloc : Expression {
Type otype;
Expression t;
Expression count;
public StackAlloc (Expression type, Expression count, Location l)
{
t = type;
this.count = count;
loc = l;
}
public override Expression DoResolve (EmitContext ec)
{
count = count.Resolve (ec);
if (count == null)
return null;
if (count.Type != TypeManager.int32_type){
count = Convert.ImplicitConversionRequired (ec, count, TypeManager.int32_type, loc);
if (count == null)
return null;
}
Constant c = count as Constant;
if (c != null && c.IsNegative) {
Report.Error (247, loc, "Cannot use a negative size with stackalloc");
return null;
}
if (ec.InCatch || ec.InFinally) {
Error (255, "Cannot use stackalloc in finally or catch");
return null;
}
TypeExpr texpr = t.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
otype = texpr.Type;
if (!TypeManager.VerifyUnManaged (otype, loc))
return null;
type = TypeManager.GetPointerType (otype);
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
int size = GetTypeSize (otype);
ILGenerator ig = ec.ig;
if (size == 0)
ig.Emit (OpCodes.Sizeof, otype);
else
IntConstant.EmitInt (ig, size);
count.Emit (ec);
ig.Emit (OpCodes.Mul);
ig.Emit (OpCodes.Localloc);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
StackAlloc target = (StackAlloc) t;
target.count = count.Clone (clonectx);
target.t = t.Clone (clonectx);
}
}
//
// An object initializer expression
//
public class ElementInitializer : Expression
{
Expression initializer;
public readonly string Name;
public ElementInitializer (string name, Expression initializer, Location loc)
{
this.Name = name;
this.initializer = initializer;
this.loc = loc;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
if (initializer == null)
return;
ElementInitializer target = (ElementInitializer) t;
target.initializer = initializer.Clone (clonectx);
}
public override Expression DoResolve (EmitContext ec)
{
if (initializer == null)
return EmptyExpressionStatement.Instance;
MemberExpr element_member = MemberLookupFinal (ec, ec.CurrentInitializerVariable.Type, ec.CurrentInitializerVariable.Type,
Name, MemberTypes.Field | MemberTypes.Property, BindingFlags.Public | BindingFlags.Instance, loc) as MemberExpr;
if (element_member == null)
return null;
element_member.InstanceExpression = ec.CurrentInitializerVariable;
if (initializer is CollectionOrObjectInitializers) {
Expression previous = ec.CurrentInitializerVariable;
ec.CurrentInitializerVariable = element_member;
initializer = initializer.Resolve (ec);
ec.CurrentInitializerVariable = previous;
return initializer;
}
Assign a = new Assign (element_member, initializer, loc);
if (a.Resolve (ec) == null)
return null;
//
// Ignore field initializers with default value
//
Constant c = a.Source as Constant;
if (c != null && c.IsDefaultInitializer (a.Type) && a.Target.eclass == ExprClass.Variable)
return EmptyExpressionStatement.Instance;
return a;
}
protected override Expression Error_MemberLookupFailed (MemberInfo[] members)
{
MemberInfo member = members [0];
if (member.MemberType != MemberTypes.Property && member.MemberType != MemberTypes.Field)
Report.Error (1913, loc, "Member `{0}' cannot be initialized. An object " +
"initializer may only be used for fields, or properties", TypeManager.GetFullNameSignature (member));
else
Report.Error (1914, loc, " Static field or property `{0}' cannot be assigned in an object initializer",
TypeManager.GetFullNameSignature (member));
return null;
}
public override void Emit (EmitContext ec)
{
throw new NotSupportedException ("Should not be reached");
}
}
//
// A collection initializer expression
//
public class CollectionElementInitializer : Expression
{
public class ElementInitializerArgument : Argument
{
public ElementInitializerArgument (Expression e)
: base (e)
{
}
}
ArrayList arguments;
public CollectionElementInitializer (Expression argument)
{
arguments = new ArrayList (1);
arguments.Add (argument);
this.loc = argument.Location;
}
public CollectionElementInitializer (ArrayList arguments, Location loc)
{
this.arguments = arguments;
this.loc = loc;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
CollectionElementInitializer target = (CollectionElementInitializer) t;
ArrayList t_arguments = target.arguments = new ArrayList (arguments.Count);
foreach (Expression e in arguments)
t_arguments.Add (e.Clone (clonectx));
}
public override Expression DoResolve (EmitContext ec)
{
// TODO: We should call a constructor which takes element counts argument,
// for know types like List, Dictionary
for (int i = 0; i < arguments.Count; ++i)
arguments [i] = new ElementInitializerArgument ((Expression)arguments [i]);
Expression add_method = new Invocation (
new MemberAccess (ec.CurrentInitializerVariable, "Add", loc),
arguments);
add_method = add_method.Resolve (ec);
return add_method;
}
public override void Emit (EmitContext ec)
{
throw new NotSupportedException ("Should not be reached");
}
}
//
// A block of object or collection initializers
//
public class CollectionOrObjectInitializers : ExpressionStatement
{
ArrayList initializers;
public static readonly CollectionOrObjectInitializers Empty =
new CollectionOrObjectInitializers (new ArrayList (0), Location.Null);
public CollectionOrObjectInitializers (ArrayList initializers, Location loc)
{
this.initializers = initializers;
this.loc = loc;
}
public bool IsEmpty {
get {
return initializers.Count == 0;
}
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
CollectionOrObjectInitializers t = (CollectionOrObjectInitializers) target;
t.initializers = new ArrayList (initializers.Count);
foreach (Expression e in initializers)
t.initializers.Add (e.Clone (clonectx));
}
public override Expression DoResolve (EmitContext ec)
{
bool is_elements_initialization = false;
ArrayList element_names = null;
for (int i = 0; i < initializers.Count; ++i) {
Expression initializer = (Expression) initializers [i];
ElementInitializer element_initializer = initializer as ElementInitializer;
if (i == 0) {
if (element_initializer != null) {
is_elements_initialization = true;
element_names = new ArrayList (initializers.Count);
element_names.Add (element_initializer.Name);
} else {
if (!TypeManager.ImplementsInterface (ec.CurrentInitializerVariable.Type,
TypeManager.ienumerable_type)) {
Report.Error (1922, loc, "A field or property `{0}' cannot be initialized with a collection " +
"object initializer because type `{1}' does not implement `{2}' interface",
ec.CurrentInitializerVariable.GetSignatureForError (),
TypeManager.CSharpName (ec.CurrentInitializerVariable.Type),
TypeManager.CSharpName (TypeManager.ienumerable_type));
return null;
}
}
} else {
if (is_elements_initialization == (element_initializer == null)) {
Report.Error (747, initializer.Location, "Inconsistent `{0}' member declaration",
is_elements_initialization ? "object initializer" : "collection initializer");
continue;
}
if (is_elements_initialization) {
if (element_names.Contains (element_initializer.Name)) {
Report.Error (1912, element_initializer.Location,
"An object initializer includes more than one member `{0}' initialization",
element_initializer.Name);
} else {
element_names.Add (element_initializer.Name);
}
}
}
Expression e = initializer.Resolve (ec);
if (e == EmptyExpressionStatement.Instance)
initializers.RemoveAt (i--);
else
initializers [i] = e;
}
type = typeof (CollectionOrObjectInitializers);
eclass = ExprClass.Variable;
return this;
}
public override void Emit (EmitContext ec)
{
EmitStatement (ec);
}
public override void EmitStatement (EmitContext ec)
{
foreach (ExpressionStatement e in initializers)
e.EmitStatement (ec);
}
}
//
// New expression with element/object initializers
//
public class NewInitialize : New
{
//
// This class serves as a proxy for variable initializer target instances.
// A real variable is assigned later when we resolve left side of an
// assignment
//
sealed class InitializerTargetExpression : Expression, IMemoryLocation
{
NewInitialize new_instance;
public InitializerTargetExpression (NewInitialize newInstance)
{
this.type = newInstance.type;
this.loc = newInstance.loc;
this.eclass = newInstance.eclass;
this.new_instance = newInstance;
}
public override Expression DoResolve (EmitContext ec)
{
return this;
}
public override Expression DoResolveLValue (EmitContext ec, Expression right_side)
{
return this;
}
public override void Emit (EmitContext ec)
{
new_instance.value_target.Emit (ec);
}
#region IMemoryLocation Members
public void AddressOf (EmitContext ec, AddressOp mode)
{
((IMemoryLocation)new_instance.value_target).AddressOf (ec, mode);
}
#endregion
}
CollectionOrObjectInitializers initializers;
public NewInitialize (Expression requested_type, ArrayList arguments, CollectionOrObjectInitializers initializers, Location l)
: base (requested_type, arguments, l)
{
this.initializers = initializers;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
base.CloneTo (clonectx, t);
NewInitialize target = (NewInitialize) t;
target.initializers = (CollectionOrObjectInitializers) initializers.Clone (clonectx);
}
public override Expression DoResolve (EmitContext ec)
{
Expression e = base.DoResolve (ec);
if (type == null)
return null;
// Empty initializer can be optimized to simple new
if (initializers.IsEmpty)
return e;
Expression previous = ec.CurrentInitializerVariable;
ec.CurrentInitializerVariable = new InitializerTargetExpression (this);
initializers.Resolve (ec);
ec.CurrentInitializerVariable = previous;
return this;
}
public override void Emit (EmitContext ec)
{
base.Emit (ec);
//
// If target is a value, let's use it
//
VariableReference variable = value_target as VariableReference;
if (variable != null) {
if (variable.IsRef)
StoreFromPtr (ec.ig, type);
else
variable.Variable.EmitAssign (ec);
} else {
if (value_target == null || value_target_set)
value_target = new LocalTemporary (type);
((LocalTemporary) value_target).Store (ec);
}
initializers.Emit (ec);
if (variable == null)
value_target.Emit (ec);
}
public override void EmitStatement (EmitContext ec)
{
if (initializers.IsEmpty) {
base.EmitStatement (ec);
return;
}
base.Emit (ec);
if (value_target == null) {
LocalTemporary variable = new LocalTemporary (type);
variable.Store (ec);
value_target = variable;
}
initializers.EmitStatement (ec);
}
public override bool HasInitializer {
get {
return !initializers.IsEmpty;
}
}
}
public class AnonymousTypeDeclaration : Expression
{
ArrayList parameters;
readonly TypeContainer parent;
static readonly ArrayList EmptyParameters = new ArrayList (0);
public AnonymousTypeDeclaration (ArrayList parameters, TypeContainer parent, Location loc)
{
this.parameters = parameters;
this.parent = parent;
this.loc = loc;
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
if (parameters == null)
return;
AnonymousTypeDeclaration t = (AnonymousTypeDeclaration) target;
t.parameters = new ArrayList (parameters.Count);
foreach (AnonymousTypeParameter atp in parameters)
t.parameters.Add (atp.Clone (clonectx));
}
AnonymousTypeClass CreateAnonymousType (ArrayList parameters)
{
AnonymousTypeClass type = RootContext.ToplevelTypes.GetAnonymousType (parameters);
if (type != null)
return type;
type = AnonymousTypeClass.Create (parent, parameters, loc);
if (type == null)
return null;
type.DefineType ();
type.DefineMembers ();
type.Define ();
type.EmitType ();
RootContext.ToplevelTypes.AddAnonymousType (type);
return type;
}
public override Expression DoResolve (EmitContext ec)
{
AnonymousTypeClass anonymous_type;
if (parameters == null) {
anonymous_type = CreateAnonymousType (EmptyParameters);
return new New (new TypeExpression (anonymous_type.TypeBuilder, loc),
null, loc).Resolve (ec);
}
bool error = false;
ArrayList arguments = new ArrayList (parameters.Count);
TypeExpression [] t_args = new TypeExpression [parameters.Count];
for (int i = 0; i < parameters.Count; ++i) {
Expression e = ((AnonymousTypeParameter) parameters [i]).Resolve (ec);
if (e == null) {
error = true;
continue;
}
arguments.Add (new Argument (e));
t_args [i] = new TypeExpression (e.Type, e.Location);
}
if (error)
return null;
anonymous_type = CreateAnonymousType (parameters);
if (anonymous_type == null)
return null;
ConstructedType te = new ConstructedType (anonymous_type.TypeBuilder,
new TypeArguments (loc, t_args), loc);
return new New (te, arguments, loc).Resolve (ec);
}
public override void Emit (EmitContext ec)
{
throw new InternalErrorException ("Should not be reached");
}
}
public class AnonymousTypeParameter : Expression
{
public readonly string Name;
Expression initializer;
public AnonymousTypeParameter (Expression initializer, string name, Location loc)
{
this.Name = name;
this.loc = loc;
this.initializer = initializer;
}
public AnonymousTypeParameter (Parameter parameter)
{
this.Name = parameter.Name;
this.loc = parameter.Location;
this.initializer = new SimpleName (Name, loc);
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
AnonymousTypeParameter t = (AnonymousTypeParameter) target;
t.initializer = initializer.Clone (clonectx);
}
public override bool Equals (object o)
{
AnonymousTypeParameter other = o as AnonymousTypeParameter;
return other != null && Name == other.Name;
}
public override int GetHashCode ()
{
return Name.GetHashCode ();
}
public override Expression DoResolve (EmitContext ec)
{
Expression e = initializer.Resolve (ec);
if (e == null)
return null;
type = e.Type;
if (type == TypeManager.void_type || type == TypeManager.null_type ||
type == TypeManager.anonymous_method_type || type.IsPointer) {
Error_InvalidInitializer (e);
return null;
}
return e;
}
protected virtual void Error_InvalidInitializer (Expression initializer)
{
Report.Error (828, loc, "An anonymous type property `{0}' cannot be initialized with `{1}'",
Name, initializer.GetSignatureForError ());
}
public override void Emit (EmitContext ec)
{
throw new InternalErrorException ("Should not be reached");
}
}
}