//
// expression.cs: Expression representation for the IL tree.
//
// Author:
// Miguel de Icaza (miguel@ximian.com)
// Marek Safar (marek.safar@gmail.com)
//
// Copyright 2001, 2002, 2003 Ximian, Inc.
// Copyright 2003-2008 Novell, Inc.
//
#define USE_OLD
namespace Mono.CSharp {
using System;
using System.Collections;
using System.Reflection;
using System.Reflection.Emit;
using System.Text;
using System.Collections.Generic;
#if NET_4_0
using SLE = System.Linq.Expressions;
#endif
//
// This is an user operator expression, automatically created during
// resolve phase
//
public class UserOperatorCall : Expression {
public delegate Expression ExpressionTreeExpression (ResolveContext ec, MethodGroupExpr mg);
protected readonly Arguments arguments;
protected readonly MethodGroupExpr mg;
readonly ExpressionTreeExpression expr_tree;
public UserOperatorCall (MethodGroupExpr mg, Arguments args, ExpressionTreeExpression expr_tree, Location loc)
{
this.mg = mg;
this.arguments = args;
this.expr_tree = expr_tree;
type = TypeManager.TypeToCoreType (((MethodInfo) mg).ReturnType);
eclass = ExprClass.Value;
this.loc = loc;
}
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
if (expr_tree != null)
return expr_tree (ec, mg);
Arguments args = Arguments.CreateForExpressionTree (ec, arguments,
new NullLiteral (loc),
mg.CreateExpressionTree (ec));
return CreateExpressionFactoryCall (ec, "Call", args);
}
protected override void CloneTo (CloneContext context, Expression target)
{
// Nothing to clone
}
public override Expression DoResolve (ResolveContext ec)
{
//
// We are born fully resolved
//
return this;
}
public override void Emit (EmitContext ec)
{
mg.EmitCall (ec, arguments);
}
#if NET_4_0
public override SLE.Expression MakeExpression (BuilderContext ctx)
{
return SLE.Expression.Call ((MethodInfo) mg, Arguments.MakeExpression (arguments, ctx));
}
#endif
public MethodGroupExpr Method {
get { return mg; }
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
arguments.MutateHoistedGenericType (storey);
mg.MutateHoistedGenericType (storey);
}
}
public class ParenthesizedExpression : Expression
{
public Expression Expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("Expr", Expr);
}
public override string GetNameX()
{
return null;
}
public ParenthesizedExpression (Expression expr)
{
Expr = expr;
loc = expr.Location;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
Expr = Expr.Resolve (ec);
return Expr;
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
return Expr.DoResolveLValue (ec, right_side);
}
public override void Emit (EmitContext ec)
{
throw new Exception ("Should not happen");
}
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,
AddressOf, TOP
}
static Type [] [] predefined_operators;
public readonly Operator Oper;
public Expression Expr;
Expression enum_conversion;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().String("Oper", Oper.ToString())
.Single("Expr", Expr);
}
public override string GetNameX()
{
return null;
}
public Unary (Operator op, Expression expr)
{
Oper = op;
Expr = expr;
loc = expr.Location;
}
// <summary>
// This routine will attempt to simplify the unary expression when the
// argument is a constant.
// </summary>
Constant TryReduceConstant (ResolveContext ec, Constant e)
{
if (e is EmptyConstantCast)
return TryReduceConstant (ec, ((EmptyConstantCast) e).child);
if (e is SideEffectConstant) {
Constant r = TryReduceConstant (ec, ((SideEffectConstant) e).value);
return r == null ? null : new SideEffectConstant (r, e, r.Location);
}
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 (ec, 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 (ec, 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)
return new FloatLiteral (-fl.Value, e.Location);
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)
return new DoubleLiteral (-dl.Value, e.Location);
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;
bool b = (bool)e.GetValue ();
return new BoolConstant (!b, e.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;
}
throw new Exception ("Can not constant fold: " + Oper.ToString());
}
protected Expression ResolveOperator (ResolveContext ec, Expression expr)
{
eclass = ExprClass.Value;
if (predefined_operators == null)
CreatePredefinedOperatorsTable ();
Type expr_type = expr.Type;
Expression best_expr;
//
// Primitive types first
//
if (TypeManager.IsPrimitiveType (expr_type)) {
best_expr = ResolvePrimitivePredefinedType (expr);
if (best_expr == null)
return null;
type = best_expr.Type;
Expr = best_expr;
return this;
}
//
// E operator ~(E x);
//
if (Oper == Operator.OnesComplement && TypeManager.IsEnumType (expr_type))
return ResolveEnumOperator (ec, expr);
return ResolveUserType (ec, expr);
}
protected virtual Expression ResolveEnumOperator (ResolveContext ec, Expression expr)
{
Type underlying_type = TypeManager.GetEnumUnderlyingType (expr.Type);
Expression best_expr = ResolvePrimitivePredefinedType (EmptyCast.Create (expr, underlying_type));
if (best_expr == null)
return null;
Expr = best_expr;
enum_conversion = Convert.ExplicitNumericConversion (new EmptyExpression (best_expr.Type), underlying_type);
type = expr.Type;
return EmptyCast.Create (this, type);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return CreateExpressionTree (ec, null);
}
Expression CreateExpressionTree (ResolveContext ec, MethodGroupExpr user_op)
{
string method_name;
switch (Oper) {
case Operator.AddressOf:
Error_PointerInsideExpressionTree (ec);
return null;
case Operator.UnaryNegation:
if (ec.HasSet (ResolveContext.Options.CheckedScope) && user_op == null && !IsFloat (type))
method_name = "NegateChecked";
else
method_name = "Negate";
break;
case Operator.OnesComplement:
case Operator.LogicalNot:
method_name = "Not";
break;
case Operator.UnaryPlus:
method_name = "UnaryPlus";
break;
default:
throw new InternalErrorException ("Unknown unary operator " + Oper.ToString ());
}
Arguments args = new Arguments (2);
args.Add (new Argument (Expr.CreateExpressionTree (ec)));
if (user_op != null)
args.Add (new Argument (user_op.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall (ec, method_name, args);
}
static void CreatePredefinedOperatorsTable ()
{
predefined_operators = new Type [(int) Operator.TOP] [];
//
// 7.6.1 Unary plus operator
//
predefined_operators [(int) Operator.UnaryPlus] = new Type [] {
TypeManager.int32_type, TypeManager.uint32_type,
TypeManager.int64_type, TypeManager.uint64_type,
TypeManager.float_type, TypeManager.double_type,
TypeManager.decimal_type
};
//
// 7.6.2 Unary minus operator
//
predefined_operators [(int) Operator.UnaryNegation] = new Type [] {
TypeManager.int32_type,
TypeManager.int64_type,
TypeManager.float_type, TypeManager.double_type,
TypeManager.decimal_type
};
//
// 7.6.3 Logical negation operator
//
predefined_operators [(int) Operator.LogicalNot] = new Type [] {
TypeManager.bool_type
};
//
// 7.6.4 Bitwise complement operator
//
predefined_operators [(int) Operator.OnesComplement] = new Type [] {
TypeManager.int32_type, TypeManager.uint32_type,
TypeManager.int64_type, TypeManager.uint64_type
};
}
//
// Unary numeric promotions
//
static Expression DoNumericPromotion (Operator op, Expression expr)
{
Type expr_type = expr.Type;
if ((op == Operator.UnaryPlus || op == Operator.UnaryNegation || op == Operator.OnesComplement) &&
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 Convert.ImplicitNumericConversion (expr, TypeManager.int32_type);
if (op == Operator.UnaryNegation && expr_type == TypeManager.uint32_type)
return Convert.ImplicitNumericConversion (expr, TypeManager.int64_type);
return expr;
}
public override Expression DoResolve (ResolveContext ec)
{
if (Oper == Operator.AddressOf) {
return ResolveAddressOf (ec);
}
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
if (TypeManager.IsDynamicType (Expr.Type)) {
Arguments args = new Arguments (1);
args.Add (new Argument (Expr));
return new DynamicUnaryConversion (GetOperatorExpressionTypeName (), args, loc).Resolve (ec);
}
if (TypeManager.IsNullableType (Expr.Type))
return new Nullable.LiftedUnaryOperator (Oper, Expr).Resolve (ec);
//
// Attempt to use a constant folding operation.
//
Constant cexpr = Expr as Constant;
if (cexpr != null) {
cexpr = TryReduceConstant (ec, cexpr);
if (cexpr != null)
return cexpr;
}
Expression expr = ResolveOperator (ec, Expr);
if (expr == null)
Error_OperatorCannotBeApplied (ec, loc, OperName (Oper), Expr.Type);
//
// Reduce unary operator on predefined types
//
if (expr == this && Oper == Operator.UnaryPlus)
return Expr;
return expr;
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right)
{
return null;
}
public override void Emit (EmitContext ec)
{
EmitOperator (ec, type);
}
protected void EmitOperator (EmitContext ec, Type type)
{
ILGenerator ig = ec.ig;
switch (Oper) {
case Operator.UnaryPlus:
Expr.Emit (ec);
break;
case Operator.UnaryNegation:
if (ec.HasSet (EmitContext.Options.CheckedScope) && !IsFloat (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 ());
}
//
// Same trick as in Binary expression
//
if (enum_conversion != null)
enum_conversion.Emit (ec);
}
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 void EmitSideEffect (EmitContext ec)
{
Expr.EmitSideEffect (ec);
}
public static void Error_OperatorCannotBeApplied (ResolveContext ec, Location loc, string oper, Type t)
{
ec.Report.Error (23, loc, "The `{0}' operator cannot be applied to operand of type `{1}'",
oper, TypeManager.CSharpName (t));
}
//
// Converts operator to System.Linq.Expressions.ExpressionType enum name
//
string GetOperatorExpressionTypeName ()
{
switch (Oper) {
case Operator.OnesComplement:
return "OnesComplement";
case Operator.LogicalNot:
return "Not";
case Operator.UnaryNegation:
return "Negate";
case Operator.UnaryPlus:
return "UnaryPlus";
default:
throw new NotImplementedException ("Unknown express type operator " + Oper.ToString ());
}
}
static bool IsFloat (Type t)
{
return t == TypeManager.float_type || t == TypeManager.double_type;
}
//
// Returns a stringified representation of the Operator
//
public static 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 "&";
}
throw new NotImplementedException (oper.ToString ());
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
Expr.MutateHoistedGenericType (storey);
}
Expression ResolveAddressOf (ResolveContext ec)
{
if (!ec.IsUnsafe)
UnsafeError (ec, loc);
Expr = Expr.DoResolveLValue (ec, EmptyExpression.UnaryAddress);
if (Expr == null || Expr.eclass != ExprClass.Variable) {
ec.Report.Error (211, loc, "Cannot take the address of the given expression");
return null;
}
if (!TypeManager.VerifyUnManaged (Expr.Type, loc)) {
return null;
}
IVariableReference vr = Expr as IVariableReference;
bool is_fixed;
if (vr != null) {
VariableInfo vi = vr.VariableInfo;
if (vi != null) {
if (vi.LocalInfo != null)
vi.LocalInfo.Used = true;
//
// A variable is considered definitely assigned if you take its address.
//
vi.SetAssigned (ec);
}
is_fixed = vr.IsFixed;
vr.SetHasAddressTaken ();
if (vr.IsHoisted) {
AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, vr, loc);
}
} else {
IFixedExpression fe = Expr as IFixedExpression;
is_fixed = fe != null && fe.IsFixed;
}
if (!is_fixed && !ec.HasSet (ResolveContext.Options.FixedInitializerScope)) {
ec.Report.Error (212, loc, "You can only take the address of unfixed expression inside of a fixed statement initializer");
}
type = TypeManager.GetPointerType (Expr.Type);
eclass = ExprClass.Value;
return this;
}
Expression ResolvePrimitivePredefinedType (Expression expr)
{
expr = DoNumericPromotion (Oper, expr);
Type expr_type = expr.Type;
Type[] predefined = predefined_operators [(int) Oper];
foreach (Type t in predefined) {
if (t == expr_type)
return expr;
}
return null;
}
//
// Perform user-operator overload resolution
//
protected virtual Expression ResolveUserOperator (ResolveContext ec, Expression expr)
{
CSharp.Operator.OpType op_type;
switch (Oper) {
case Operator.LogicalNot:
op_type = CSharp.Operator.OpType.LogicalNot; break;
case Operator.OnesComplement:
op_type = CSharp.Operator.OpType.OnesComplement; break;
case Operator.UnaryNegation:
op_type = CSharp.Operator.OpType.UnaryNegation; break;
case Operator.UnaryPlus:
op_type = CSharp.Operator.OpType.UnaryPlus; break;
default:
throw new InternalErrorException (Oper.ToString ());
}
string op_name = CSharp.Operator.GetMetadataName (op_type);
MethodGroupExpr user_op = MemberLookup (ec.Compiler, ec.CurrentType, expr.Type, op_name, MemberTypes.Method, AllBindingFlags, expr.Location) as MethodGroupExpr;
if (user_op == null)
return null;
Arguments args = new Arguments (1);
args.Add (new Argument (expr));
user_op = user_op.OverloadResolve (ec, ref args, false, expr.Location);
if (user_op == null)
return null;
Expr = args [0].Expr;
return new UserOperatorCall (user_op, args, CreateExpressionTree, expr.Location);
}
//
// Unary user type overload resolution
//
Expression ResolveUserType (ResolveContext ec, Expression expr)
{
Expression best_expr = ResolveUserOperator (ec, expr);
if (best_expr != null)
return best_expr;
Type[] predefined = predefined_operators [(int) Oper];
foreach (Type t in predefined) {
Expression oper_expr = Convert.UserDefinedConversion (ec, expr, t, expr.Location, false, false);
if (oper_expr == null)
continue;
//
// decimal type is predefined but has user-operators
//
if (oper_expr.Type == TypeManager.decimal_type)
oper_expr = ResolveUserType (ec, oper_expr);
else
oper_expr = ResolvePrimitivePredefinedType (oper_expr);
if (oper_expr == null)
continue;
if (best_expr == null) {
best_expr = oper_expr;
continue;
}
int result = MethodGroupExpr.BetterTypeConversion (ec, best_expr.Type, t);
if (result == 0) {
ec.Report.Error (35, loc, "Operator `{0}' is ambiguous on an operand of type `{1}'",
OperName (Oper), TypeManager.CSharpName (expr.Type));
break;
}
if (result == 2)
best_expr = oper_expr;
}
if (best_expr == null)
return null;
//
// HACK: Decimal user-operator is included in standard operators
//
if (best_expr.Type == TypeManager.decimal_type)
return best_expr;
Expr = best_expr;
type = best_expr.Type;
return this;
}
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, IFixedExpression {
Expression expr;
LocalTemporary temporary;
bool prepared;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("expr", expr);
}
public override string GetNameX()
{
return null;
}
public Indirection (Expression expr, Location l)
{
this.expr = expr;
loc = l;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Error_PointerInsideExpressionTree (ec);
return null;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Indirection target = (Indirection) t;
target.expr = expr.Clone (clonectx);
}
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 (ResolveContext ec, Expression right_side)
{
return DoResolve (ec);
}
public override Expression DoResolve (ResolveContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
if (!ec.IsUnsafe)
UnsafeError (ec, loc);
if (!expr.Type.IsPointer) {
ec.Report.Error (193, loc, "The * or -> operator must be applied to a pointer");
return null;
}
if (expr.Type == TypeManager.void_ptr_type) {
ec.Report.Error (242, loc, "The operation in question is undefined on void pointers");
return null;
}
type = TypeManager.GetElementType (expr.Type);
eclass = ExprClass.Variable;
return this;
}
public bool IsFixed {
get { return true; }
}
public override string ToString ()
{
return "*(" + expr + ")";
}
}
/// <summary>
/// Unary Mutator expressions (pre and post ++ and --)
/// </summary>
///
/// <remarks>
/// UnaryMutator implements ++ and -- expressions. It derives from
/// ExpressionStatement becuase the pre/post increment/decrement
/// operators can be used in a statement context.
///
/// FIXME: Idea, we could split this up in two classes, one simpler
/// for the common case, and one with the extra fields for more complex
/// classes (indexers require temporary access; overloaded require method)
///
/// </remarks>
public class UnaryMutator : ExpressionStatement {
[Flags]
public enum Mode : byte {
IsIncrement = 0,
IsDecrement = 1,
IsPre = 0,
IsPost = 2,
PreIncrement = 0,
PreDecrement = IsDecrement,
PostIncrement = IsPost,
PostDecrement = IsPost | IsDecrement
}
Mode mode;
bool is_expr = false;
bool recurse = false;
Expression expr;
//
// This is expensive for the simplest case.
//
UserOperatorCall method;
public UnaryMutator (Mode m, Expression e)
{
mode = m;
loc = e.Location;
expr = e;
}
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("expr", expr).Single("method", method);
}
public override string GetNameX()
{
return null;
}
static string OperName (Mode mode)
{
return (mode == Mode.PreIncrement || mode == Mode.PostIncrement) ?
"++" : "--";
}
/// <summary>
/// Returns whether an object of type `t' can be incremented
/// or decremented with add/sub (ie, basically whether we can
/// use pre-post incr-decr operations on it, but it is not a
/// System.Decimal, which we require operator overloading to catch)
/// </summary>
static bool IsIncrementableNumber (Type t)
{
return (t == TypeManager.sbyte_type) ||
(t == TypeManager.byte_type) ||
(t == TypeManager.short_type) ||
(t == TypeManager.ushort_type) ||
(t == TypeManager.int32_type) ||
(t == TypeManager.uint32_type) ||
(t == TypeManager.int64_type) ||
(t == TypeManager.uint64_type) ||
(t == TypeManager.char_type) ||
(TypeManager.IsSubclassOf (t, TypeManager.enum_type)) ||
(t == TypeManager.float_type) ||
(t == TypeManager.double_type) ||
(t.IsPointer && t != TypeManager.void_ptr_type);
}
Expression ResolveOperator (ResolveContext ec)
{
type = expr.Type;
//
// 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
//
if (expr.eclass == ExprClass.Variable || expr.eclass == ExprClass.IndexerAccess || expr.eclass == ExprClass.PropertyAccess) {
expr = expr.ResolveLValue (ec, expr);
} else {
ec.Report.Error (1059, loc, "The operand of an increment or decrement operator must be a variable, property or indexer");
}
//
// Step 1: Perform Operator Overload location
//
MethodGroupExpr mg;
string op_name;
if (mode == Mode.PreIncrement || mode == Mode.PostIncrement)
op_name = Operator.GetMetadataName (Operator.OpType.Increment);
else
op_name = Operator.GetMetadataName (Operator.OpType.Decrement);
mg = MemberLookup (ec.Compiler, ec.CurrentType, type, op_name, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
if (mg != null) {
Arguments args = new Arguments (1);
args.Add (new Argument (expr));
mg = mg.OverloadResolve (ec, ref args, false, loc);
if (mg == null)
return null;
method = new UserOperatorCall (mg, args, null, loc);
Convert.ImplicitConversionRequired (ec, method, type, loc);
return this;
}
if (!IsIncrementableNumber (type)) {
ec.Report.Error (187, loc, "No such operator '" + OperName (mode) + "' defined for type '" +
TypeManager.CSharpName (type) + "'");
return null;
}
return this;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return new SimpleAssign (this, this).CreateExpressionTree (ec);
}
public override Expression DoResolve (ResolveContext ec)
{
expr = expr.Resolve (ec);
if (expr == null)
return null;
if (TypeManager.IsDynamicType (expr.Type)) {
Arguments args = new Arguments (1);
args.Add (new Argument (expr));
return new DynamicUnaryConversion (GetOperatorExpressionTypeName (), args, loc).Resolve (ec);
}
eclass = ExprClass.Value;
if (TypeManager.IsNullableType (expr.Type))
return new Nullable.LiftedUnaryMutator (mode, expr, loc).Resolve (ec);
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);
ig.Emit (OpCodes.Conv_I);
}
} else
ig.Emit (OpCodes.Ldc_I4_1);
//
// Now emit the operation
//
Binary.Operator op = (mode & Mode.IsDecrement) != 0 ? Binary.Operator.Subtraction : Binary.Operator.Addition;
Binary.EmitOperatorOpcode (ec, op, t);
if (t == TypeManager.sbyte_type){
if (ec.HasSet (EmitContext.Options.CheckedScope))
ig.Emit (OpCodes.Conv_Ovf_I1);
else
ig.Emit (OpCodes.Conv_I1);
} else if (t == TypeManager.byte_type){
if (ec.HasSet (EmitContext.Options.CheckedScope))
ig.Emit (OpCodes.Conv_Ovf_U1);
else
ig.Emit (OpCodes.Conv_U1);
} else if (t == TypeManager.short_type){
if (ec.HasSet (EmitContext.Options.CheckedScope))
ig.Emit (OpCodes.Conv_Ovf_I2);
else
ig.Emit (OpCodes.Conv_I2);
} else if (t == TypeManager.ushort_type || t == TypeManager.char_type){
if (ec.HasSet (EmitContext.Options.CheckedScope))
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, (MethodInfo)method.Method);
recurse = false;
return;
}
EmitCode (ec, true);
}
public override void EmitStatement (EmitContext ec)
{
EmitCode (ec, false);
}
//
// Converts operator to System.Linq.Expressions.ExpressionType enum name
//
string GetOperatorExpressionTypeName ()
{
if ((mode & Mode.IsDecrement) != 0)
return "Decrement";
return "Increment";
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
UnaryMutator target = (UnaryMutator) t;
target.expr = expr.Clone (clonectx);
}
}
/// <summary>
/// Base class for the `Is' and `As' classes.
/// </summary>
///
/// <remarks>
/// FIXME: Split this in two, and we get to save the `Operator' Oper
/// size.
/// </remarks>
public abstract class Probe : Expression {
public Expression ProbeType;
protected Expression expr;
protected TypeExpr probe_type_expr;
public Probe (Expression expr, Expression probe_type, Location l)
{
ProbeType = probe_type;
loc = l;
this.expr = expr;
}
public Expression Expr {
get {
return expr;
}
}
public override Expression DoResolve (ResolveContext 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 ((probe_type_expr.Type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
ec.Report.Error (-244, loc, "The `{0}' operator cannot be applied to an operand of a static type",
OperatorName);
}
if (expr.Type.IsPointer || probe_type_expr.Type.IsPointer) {
ec.Report.Error (244, loc, "The `{0}' operator cannot be applied to an operand of pointer type",
OperatorName);
return null;
}
if (expr.Type == InternalType.AnonymousMethod) {
ec.Report.Error (837, loc, "The `{0}' operator cannot be applied to a lambda expression or anonymous method",
OperatorName);
return null;
}
return this;
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
expr.MutateHoistedGenericType (storey);
probe_type_expr.MutateHoistedGenericType (storey);
}
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);
}
}
/// <summary>
/// Implementation of the `is' operator.
/// </summary>
public class Is : Probe {
Nullable.Unwrap expr_unwrap;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("expr_unwrap", expr_unwrap);
}
public override string GetNameX()
{
return null;
}
public Is (Expression expr, Expression probe_type, Location l)
: base (expr, probe_type, l)
{
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = Arguments.CreateForExpressionTree (ec, null,
expr.CreateExpressionTree (ec),
new TypeOf (probe_type_expr, loc));
return CreateExpressionFactoryCall (ec, "TypeIs", args);
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
if (expr_unwrap != null) {
expr_unwrap.EmitCheck (ec);
return;
}
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;
if (expr_unwrap != null) {
expr_unwrap.EmitCheck (ec);
} else {
expr.Emit (ec);
ig.Emit (OpCodes.Isinst, probe_type_expr.Type);
}
ig.Emit (on_true ? OpCodes.Brtrue : OpCodes.Brfalse, target);
}
Expression CreateConstantResult (ResolveContext ec, bool result)
{
if (result)
ec.Report.Warning (183, 1, loc, "The given expression is always of the provided (`{0}') type",
TypeManager.CSharpName (probe_type_expr.Type));
else
ec.Report.Warning (184, 1, loc, "The given expression is never of the provided (`{0}') type",
TypeManager.CSharpName (probe_type_expr.Type));
return ReducedExpression.Create (new BoolConstant (result, loc), this);
}
public override Expression DoResolve (ResolveContext ec)
{
if (base.DoResolve (ec) == null)
return null;
Type d = expr.Type;
bool d_is_nullable = false;
//
// If E is a method group or the null literal, or 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 || expr.eclass == ExprClass.MethodGroup)
return CreateConstantResult (ec, false);
if (TypeManager.IsNullableType (d) && !TypeManager.ContainsGenericParameters (d)) {
d = TypeManager.TypeToCoreType (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.TypeToCoreType (TypeManager.GetTypeArguments (t) [0]);
t_is_nullable = true;
}
if (TypeManager.IsStruct (t)) {
if (d == t) {
//
// D and T are the same value types but D can be null
//
if (d_is_nullable && !t_is_nullable) {
expr_unwrap = Nullable.Unwrap.Create (expr, false);
return this;
}
//
// The result is true if D and T are the same value types
//
return CreateConstantResult (ec, true);
}
if (TypeManager.IsGenericParameter (d))
return ResolveGenericParameter (ec, t, d);
//
// An unboxing conversion exists
//
if (Convert.ExplicitReferenceConversionExists (d, t))
return this;
} else {
if (TypeManager.IsGenericParameter (t))
return ResolveGenericParameter (ec, d, t);
if (TypeManager.IsStruct (d)) {
bool temp;
if (Convert.ImplicitBoxingConversionExists (expr, t, out temp))
return CreateConstantResult (ec, true);
} else {
if (TypeManager.IsGenericParameter (d))
return ResolveGenericParameter (ec, t, d);
if (TypeManager.ContainsGenericParameters (d))
return this;
if (Convert.ImplicitReferenceConversionExists (expr, t) ||
Convert.ExplicitReferenceConversionExists (d, t)) {
return this;
}
}
}
return CreateConstantResult (ec, false);
}
Expression ResolveGenericParameter (ResolveContext ec, Type d, Type t)
{
GenericConstraints constraints = TypeManager.GetTypeParameterConstraints (t);
if (constraints != null) {
if (constraints.IsReferenceType && TypeManager.IsStruct (d))
return CreateConstantResult (ec, false);
}
if (TypeManager.IsGenericParameter (expr.Type)) {
if (constraints != null && constraints.IsValueType && expr.Type == t)
return CreateConstantResult (ec, true);
expr = new BoxedCast (expr, d);
}
return this;
}
protected override string OperatorName {
get { return "is"; }
}
}
/// <summary>
/// Implementation of the `as' operator.
/// </summary>
public class As : Probe {
bool do_isinst;
Expression resolved_type;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("resolved_type", resolved_type);
}
public override string GetNameX()
{
return null;
}
public As (Expression expr, Expression probe_type, Location l)
: base (expr, probe_type, l)
{
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = Arguments.CreateForExpressionTree (ec, null,
expr.CreateExpressionTree (ec),
new TypeOf (probe_type_expr, loc));
return CreateExpressionFactoryCall (ec, "TypeAs", args);
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
expr.Emit (ec);
if (do_isinst)
ig.Emit (OpCodes.Isinst, type);
#if GMCS_SOURCE
if (TypeManager.IsGenericParameter (type) || TypeManager.IsNullableType (type))
ig.Emit (OpCodes.Unbox_Any, type);
#endif
}
public override Expression DoResolve (ResolveContext ec)
{
// Because expr is modified
if (eclass != ExprClass.Invalid)
return this;
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 (!TypeManager.IsReferenceType (type) && !TypeManager.IsNullableType (type)) {
if (TypeManager.IsGenericParameter (type)) {
ec.Report.Error (413, loc,
"The `as' operator cannot be used with a non-reference type parameter `{0}'. Consider adding `class' or a reference type constraint",
probe_type_expr.GetSignatureForError ());
} else {
ec.Report.Error (77, loc,
"The `as' operator cannot be used with a non-nullable value type `{0}'",
TypeManager.CSharpName (type));
}
return null;
}
if (expr.IsNull && TypeManager.IsNullableType (type)) {
return Nullable.LiftedNull.CreateFromExpression (ec, this);
}
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;
}
ec.Report.Error (39, loc, "Cannot convert type `{0}' to `{1}' via a built-in conversion",
TypeManager.CSharpName (etype), TypeManager.CSharpName (type));
return null;
}
protected override string OperatorName {
get { return "as"; }
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
base.MutateHoistedGenericType (storey);
}
public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
return expr.GetAttributableValue (ec, value_type, out value);
}
}
/// <summary>
/// This represents a typecast in the source language.
///
/// FIXME: Cast expressions have an unusual set of parsing
/// rules, we need to figure those out.
/// </summary>
public class Cast : Expression {
Expression target_type;
Expression expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("expr", expr).Single("target_type", target_type);
}
public override string GetNameX()
{
return null;
}
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;
}
public Expression TargetType {
get { return target_type; }
}
public Expression Expr {
get { return expr; }
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext 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) {
ec.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.IsUnsafe) {
UnsafeError (ec, loc);
} else if (TypeManager.IsDynamicType (expr.Type)) {
Arguments arg = new Arguments (1);
arg.Add (new Argument (expr));
return new DynamicConversion (type, true, arg, loc).Resolve (ec);
}
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
{
sealed class DefaultValueNullLiteral : NullLiteral
{
public DefaultValueNullLiteral (DefaultValueExpression expr)
: base (expr.type, expr.loc)
{
}
public override void Error_ValueCannotBeConverted (ResolveContext ec, Location loc, Type t, bool expl)
{
Error_ValueCannotBeConvertedCore (ec, loc, t, expl);
}
}
Expression expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("expr", expr);
}
public override string GetNameX()
{
return null;
}
public DefaultValueExpression (Expression expr, Location loc)
{
this.expr = expr;
this.loc = loc;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (this));
args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
return CreateExpressionFactoryCall (ec, "Constant", args);
}
public override Expression DoResolve (ResolveContext ec)
{
TypeExpr texpr = expr.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
type = texpr.Type;
if ((type.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
ec.Report.Error (-244, loc, "The `default value' operator cannot be applied to an operand of a static type");
}
if (type.IsPointer)
return new NullLiteral (Location).ConvertImplicitly (type);
if (TypeManager.IsReferenceType (type))
return new DefaultValueNullLiteral (this);
Constant c = New.Constantify (type);
if (c != null)
return c;
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);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
DefaultValueExpression target = (DefaultValueExpression) t;
target.expr = expr.Clone (clonectx);
}
}
/// <summary>
/// Binary operators
/// </summary>
public class Binary : Expression, IDynamicBinder
{
protected class PredefinedOperator {
protected readonly Type left;
protected readonly Type right;
public readonly Operator OperatorsMask;
public Type ReturnType;
public PredefinedOperator (Type ltype, Type rtype, Operator op_mask)
: this (ltype, rtype, op_mask, ltype)
{
}
public PredefinedOperator (Type type, Operator op_mask, Type return_type)
: this (type, type, op_mask, return_type)
{
}
public PredefinedOperator (Type type, Operator op_mask)
: this (type, type, op_mask, type)
{
}
public PredefinedOperator (Type ltype, Type rtype, Operator op_mask, Type return_type)
{
if ((op_mask & Operator.ValuesOnlyMask) != 0)
throw new InternalErrorException ("Only masked values can be used");
this.left = ltype;
this.right = rtype;
this.OperatorsMask = op_mask;
this.ReturnType = return_type;
}
public virtual Expression ConvertResult (ResolveContext ec, Binary b)
{
b.type = ReturnType;
b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
b.right = Convert.ImplicitConversion (ec, b.right, right, b.right.Location);
//
// A user operators does not support multiple user conversions, but decimal type
// is considered to be predefined type therefore we apply predefined operators rules
// and then look for decimal user-operator implementation
//
if (left == TypeManager.decimal_type)
return b.ResolveUserOperator (ec, b.left.Type, b.right.Type);
return b;
}
public bool IsPrimitiveApplicable (Type ltype, Type rtype)
{
//
// We are dealing with primitive types only
//
return left == ltype && ltype == rtype;
}
public virtual bool IsApplicable (ResolveContext ec, Expression lexpr, Expression rexpr)
{
if (TypeManager.IsEqual (left, lexpr.Type) &&
TypeManager.IsEqual (right, rexpr.Type))
return true;
return Convert.ImplicitConversionExists (ec, lexpr, left) &&
Convert.ImplicitConversionExists (ec, rexpr, right);
}
public PredefinedOperator ResolveBetterOperator (ResolveContext ec, PredefinedOperator best_operator)
{
int result = 0;
if (left != null && best_operator.left != null) {
result = MethodGroupExpr.BetterTypeConversion (ec, best_operator.left, left);
}
//
// When second arguments are same as the first one, the result is same
//
if (right != null && (left != right || best_operator.left != best_operator.right)) {
result |= MethodGroupExpr.BetterTypeConversion (ec, best_operator.right, right);
}
if (result == 0 || result > 2)
return null;
return result == 1 ? best_operator : this;
}
}
class PredefinedStringOperator : PredefinedOperator {
public PredefinedStringOperator (Type type, Operator op_mask)
: base (type, op_mask, type)
{
ReturnType = TypeManager.string_type;
}
public PredefinedStringOperator (Type ltype, Type rtype, Operator op_mask)
: base (ltype, rtype, op_mask)
{
ReturnType = TypeManager.string_type;
}
public override Expression ConvertResult (ResolveContext ec, Binary b)
{
//
// Use original expression for nullable arguments
//
Nullable.Unwrap unwrap = b.left as Nullable.Unwrap;
if (unwrap != null)
b.left = unwrap.Original;
unwrap = b.right as Nullable.Unwrap;
if (unwrap != null)
b.right = unwrap.Original;
b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
b.right = Convert.ImplicitConversion (ec, b.right, right, b.right.Location);
//
// Start a new concat expression using converted expression
//
return new StringConcat (b.loc, b.left, b.right).Resolve (ec);
}
}
class PredefinedShiftOperator : PredefinedOperator {
public PredefinedShiftOperator (Type ltype, Operator op_mask) :
base (ltype, TypeManager.int32_type, op_mask)
{
}
public override Expression ConvertResult (ResolveContext ec, Binary b)
{
b.left = Convert.ImplicitConversion (ec, b.left, left, b.left.Location);
Expression expr_tree_expr = EmptyCast.Create (b.right, TypeManager.int32_type);
int right_mask = left == TypeManager.int32_type || left == TypeManager.uint32_type ? 0x1f : 0x3f;
//
// b = b.left >> b.right & (0x1f|0x3f)
//
b.right = new Binary (Operator.BitwiseAnd,
b.right, new IntConstant (right_mask, b.right.Location)).Resolve (ec);
//
// Expression tree representation does not use & mask
//
b.right = ReducedExpression.Create (b.right, expr_tree_expr).Resolve (ec);
b.type = ReturnType;
return b;
}
}
class PredefinedPointerOperator : PredefinedOperator {
public PredefinedPointerOperator (Type ltype, Type rtype, Operator op_mask)
: base (ltype, rtype, op_mask)
{
}
public PredefinedPointerOperator (Type ltype, Type rtype, Operator op_mask, Type retType)
: base (ltype, rtype, op_mask, retType)
{
}
public PredefinedPointerOperator (Type type, Operator op_mask, Type return_type)
: base (type, op_mask, return_type)
{
}
public override bool IsApplicable (ResolveContext ec, Expression lexpr, Expression rexpr)
{
if (left == null) {
if (!lexpr.Type.IsPointer)
return false;
} else {
if (!Convert.ImplicitConversionExists (ec, lexpr, left))
return false;
}
if (right == null) {
if (!rexpr.Type.IsPointer)
return false;
} else {
if (!Convert.ImplicitConversionExists (ec, rexpr, right))
return false;
}
return true;
}
public override Expression ConvertResult (ResolveContext ec, Binary b)
{
if (left != null) {
b.left = EmptyCast.Create (b.left, left);
} else if (right != null) {
b.right = EmptyCast.Create (b.right, right);
}
Type r_type = ReturnType;
Expression left_arg, right_arg;
if (r_type == null) {
if (left == null) {
left_arg = b.left;
right_arg = b.right;
r_type = b.left.Type;
} else {
left_arg = b.right;
right_arg = b.left;
r_type = b.right.Type;
}
} else {
left_arg = b.left;
right_arg = b.right;
}
return new PointerArithmetic (b.oper, left_arg, right_arg, r_type, b.loc).Resolve (ec);
}
}
[Flags]
public enum Operator {
Multiply = 0 | ArithmeticMask,
Division = 1 | ArithmeticMask,
Modulus = 2 | ArithmeticMask,
Addition = 3 | ArithmeticMask | AdditionMask,
Subtraction = 4 | ArithmeticMask | SubtractionMask,
LeftShift = 5 | ShiftMask,
RightShift = 6 | ShiftMask,
LessThan = 7 | ComparisonMask | RelationalMask,
GreaterThan = 8 | ComparisonMask | RelationalMask,
LessThanOrEqual = 9 | ComparisonMask | RelationalMask,
GreaterThanOrEqual = 10 | ComparisonMask | RelationalMask,
Equality = 11 | ComparisonMask | EqualityMask,
Inequality = 12 | ComparisonMask | EqualityMask,
BitwiseAnd = 13 | BitwiseMask,
ExclusiveOr = 14 | BitwiseMask,
BitwiseOr = 15 | BitwiseMask,
LogicalAnd = 16 | LogicalMask,
LogicalOr = 17 | LogicalMask,
//
// Operator masks
//
ValuesOnlyMask = ArithmeticMask - 1,
ArithmeticMask = 1 << 5,
ShiftMask = 1 << 6,
ComparisonMask = 1 << 7,
EqualityMask = 1 << 8,
BitwiseMask = 1 << 9,
LogicalMask = 1 << 10,
AdditionMask = 1 << 11,
SubtractionMask = 1 << 12,
RelationalMask = 1 << 13
}
readonly Operator oper;
protected Expression left, right;
readonly bool is_compound;
Expression enum_conversion;
static PredefinedOperator [] standard_operators;
static PredefinedOperator [] pointer_operators;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("left", left).Single("right", right).String("oper", oper.ToString());
}
public override string GetNameX()
{
return null;
}
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;
}
}
/// <summary>
/// Returns a stringified representation of the Operator
/// </summary>
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 static void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right, Operator oper, Location loc)
{
new Binary (oper, left, right).Error_OperatorCannotBeApplied (ec, left, right);
}
public static void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right, string oper, Location loc)
{
string l, r;
l = TypeManager.CSharpName (left.Type);
r = TypeManager.CSharpName (right.Type);
ec.Report.Error (19, loc, "Operator `{0}' cannot be applied to operands of type `{1}' and `{2}'",
oper, l, r);
}
protected void Error_OperatorCannotBeApplied (ResolveContext ec, Expression left, Expression right)
{
Error_OperatorCannotBeApplied (ec, left, right, OperName (oper), loc);
}
//
// Converts operator to System.Linq.Expressions.ExpressionType enum name
//
string GetOperatorExpressionTypeName ()
{
switch (oper) {
case Operator.Addition:
return is_compound ? "AddAssign" : "Add";
case Operator.BitwiseAnd:
return is_compound ? "AndAssign" : "And";
case Operator.BitwiseOr:
return is_compound ? "OrAssign" : "Or";
case Operator.Division:
return is_compound ? "DivideAssign" : "Divide";
case Operator.ExclusiveOr:
return is_compound ? "ExclusiveOrAssign" : "ExclusiveOr";
case Operator.Equality:
return "Equal";
case Operator.GreaterThan:
return "GreaterThan";
case Operator.GreaterThanOrEqual:
return "GreaterThanOrEqual";
case Operator.Inequality:
return "NotEqual";
case Operator.LeftShift:
return is_compound ? "LeftShiftAssign" : "LeftShift";
case Operator.LessThan:
return "LessThan";
case Operator.LessThanOrEqual:
return "LessThanOrEqual";
case Operator.LogicalAnd:
return "And";
case Operator.LogicalOr:
return "Or";
case Operator.Modulus:
return is_compound ? "ModuloAssign" : "Modulo";
case Operator.Multiply:
return is_compound ? "MultiplyAssign" : "Multiply";
case Operator.RightShift:
return is_compound ? "RightShiftAssign" : "RightShift";
case Operator.Subtraction:
return is_compound ? "SubtractAssign" : "Subtract";
default:
throw new NotImplementedException ("Unknown expression type operator " + oper.ToString ());
}
}
static string GetOperatorMetadataName (Operator op)
{
CSharp.Operator.OpType op_type;
switch (op) {
case Operator.Addition:
op_type = CSharp.Operator.OpType.Addition; break;
case Operator.BitwiseAnd:
op_type = CSharp.Operator.OpType.BitwiseAnd; break;
case Operator.BitwiseOr:
op_type = CSharp.Operator.OpType.BitwiseOr; break;
case Operator.Division:
op_type = CSharp.Operator.OpType.Division; break;
case Operator.Equality:
op_type = CSharp.Operator.OpType.Equality; break;
case Operator.ExclusiveOr:
op_type = CSharp.Operator.OpType.ExclusiveOr; break;
case Operator.GreaterThan:
op_type = CSharp.Operator.OpType.GreaterThan; break;
case Operator.GreaterThanOrEqual:
op_type = CSharp.Operator.OpType.GreaterThanOrEqual; break;
case Operator.Inequality:
op_type = CSharp.Operator.OpType.Inequality; break;
case Operator.LeftShift:
op_type = CSharp.Operator.OpType.LeftShift; break;
case Operator.LessThan:
op_type = CSharp.Operator.OpType.LessThan; break;
case Operator.LessThanOrEqual:
op_type = CSharp.Operator.OpType.LessThanOrEqual; break;
case Operator.Modulus:
op_type = CSharp.Operator.OpType.Modulus; break;
case Operator.Multiply:
op_type = CSharp.Operator.OpType.Multiply; break;
case Operator.RightShift:
op_type = CSharp.Operator.OpType.RightShift; break;
case Operator.Subtraction:
op_type = CSharp.Operator.OpType.Subtraction; break;
default:
throw new InternalErrorException (op.ToString ());
}
return CSharp.Operator.GetMetadataName (op_type);
}
public static void EmitOperatorOpcode (EmitContext ec, Operator oper, Type l)
{
OpCode opcode;
ILGenerator ig = ec.ig;
switch (oper){
case Operator.Multiply:
if (ec.HasSet (EmitContext.Options.CheckedScope)) {
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Mul_Ovf;
else if (!IsFloat (l))
opcode = OpCodes.Mul_Ovf_Un;
else
opcode = OpCodes.Mul;
} else
opcode = OpCodes.Mul;
break;
case Operator.Division:
if (IsUnsigned (l))
opcode = OpCodes.Div_Un;
else
opcode = OpCodes.Div;
break;
case Operator.Modulus:
if (IsUnsigned (l))
opcode = OpCodes.Rem_Un;
else
opcode = OpCodes.Rem;
break;
case Operator.Addition:
if (ec.HasSet (EmitContext.Options.CheckedScope)) {
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Add_Ovf;
else if (!IsFloat (l))
opcode = OpCodes.Add_Ovf_Un;
else
opcode = OpCodes.Add;
} else
opcode = OpCodes.Add;
break;
case Operator.Subtraction:
if (ec.HasSet (EmitContext.Options.CheckedScope)) {
if (l == TypeManager.int32_type || l == TypeManager.int64_type)
opcode = OpCodes.Sub_Ovf;
else if (!IsFloat (l))
opcode = OpCodes.Sub_Ovf_Un;
else
opcode = OpCodes.Sub;
} else
opcode = OpCodes.Sub;
break;
case Operator.RightShift:
if (IsUnsigned (l))
opcode = OpCodes.Shr_Un;
else
opcode = OpCodes.Shr;
break;
case Operator.LeftShift:
opcode = OpCodes.Shl;
break;
case Operator.Equality:
opcode = OpCodes.Ceq;
break;
case Operator.Inequality:
ig.Emit (OpCodes.Ceq);
ig.Emit (OpCodes.Ldc_I4_0);
opcode = OpCodes.Ceq;
break;
case Operator.LessThan:
if (IsUnsigned (l))
opcode = OpCodes.Clt_Un;
else
opcode = OpCodes.Clt;
break;
case Operator.GreaterThan:
if (IsUnsigned (l))
opcode = OpCodes.Cgt_Un;
else
opcode = OpCodes.Cgt;
break;
case Operator.LessThanOrEqual:
if (IsUnsigned (l) || IsFloat (l))
ig.Emit (OpCodes.Cgt_Un);
else
ig.Emit (OpCodes.Cgt);
ig.Emit (OpCodes.Ldc_I4_0);
opcode = OpCodes.Ceq;
break;
case Operator.GreaterThanOrEqual:
if (IsUnsigned (l) || IsFloat (l))
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 InternalErrorException (oper.ToString ());
}
ig.Emit (opcode);
}
static bool IsUnsigned (Type t)
{
if (t.IsPointer)
return true;
return (t == TypeManager.uint32_type || t == TypeManager.uint64_type ||
t == TypeManager.ushort_type || t == TypeManager.byte_type);
}
static bool IsFloat (Type t)
{
return t == TypeManager.float_type || t == TypeManager.double_type;
}
Expression ResolveOperator (ResolveContext ec)
{
Type l = left.Type;
Type r = right.Type;
Expression expr;
bool primitives_only = false;
if (standard_operators == null)
CreateStandardOperatorsTable ();
//
// Handles predefined primitive types
//
if (TypeManager.IsPrimitiveType (l) && TypeManager.IsPrimitiveType (r)) {
if ((oper & Operator.ShiftMask) == 0) {
if (l != TypeManager.bool_type && !DoBinaryOperatorPromotion (ec))
return null;
primitives_only = true;
}
} else {
// Pointers
if (l.IsPointer || r.IsPointer)
return ResolveOperatorPointer (ec, l, r);
// Enums
bool lenum = TypeManager.IsEnumType (l);
bool renum = TypeManager.IsEnumType (r);
if (lenum || renum) {
expr = ResolveOperatorEnum (ec, lenum, renum, l, r);
// TODO: Can this be ambiguous
if (expr != null)
return expr;
}
// Delegates
if ((oper == Operator.Addition || oper == Operator.Subtraction || (oper & Operator.EqualityMask) != 0) &&
(TypeManager.IsDelegateType (l) || TypeManager.IsDelegateType (r))) {
expr = ResolveOperatorDelegate (ec, l, r);
// TODO: Can this be ambiguous
if (expr != null)
return expr;
}
// User operators
expr = ResolveUserOperator (ec, l, r);
if (expr != null)
return expr;
// Predefined reference types equality
if ((oper & Operator.EqualityMask) != 0) {
expr = ResolveOperatorEqualityRerefence (ec, l, r);
if (expr != null)
return expr;
}
}
return ResolveOperatorPredefined (ec, standard_operators, primitives_only, null);
}
// at least one of 'left' or 'right' is an enumeration constant (EnumConstant or SideEffectConstant or ...)
// if 'left' is not an enumeration constant, create one from the type of 'right'
Constant EnumLiftUp (ResolveContext ec, Constant left, Constant right, Location loc)
{
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 (TypeManager.IsEnumType (left.Type))
return left;
if (left.IsZeroInteger)
return left.TryReduce (ec, right.Type, loc);
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 (TypeManager.IsEnumType (right.Type) || TypeManager.IsEnumType (left.Type))
break;
return left;
}
Error_OperatorCannotBeApplied (ec, this.left, this.right);
return null;
}
//
// The `|' operator used on types which were extended is dangerous
//
void CheckBitwiseOrOnSignExtended (ResolveContext ec)
{
OpcodeCast lcast = left as OpcodeCast;
if (lcast != null) {
if (IsUnsigned (lcast.UnderlyingType))
lcast = null;
}
OpcodeCast rcast = right as OpcodeCast;
if (rcast != null) {
if (IsUnsigned (rcast.UnderlyingType))
rcast = null;
}
if (lcast == null && rcast == null)
return;
// FIXME: consider constants
ec.Report.Warning (675, 3, loc,
"The operator `|' used on the sign-extended type `{0}'. Consider casting to a smaller unsigned type first",
TypeManager.CSharpName (lcast != null ? lcast.UnderlyingType : rcast.UnderlyingType));
}
static void CreatePointerOperatorsTable ()
{
ArrayList temp = new ArrayList ();
//
// Pointer arithmetic:
//
// T* operator + (T* x, int y); T* operator - (T* x, int y);
// T* operator + (T* x, uint y); T* operator - (T* x, uint y);
// T* operator + (T* x, long y); T* operator - (T* x, long y);
// T* operator + (T* x, ulong y); T* operator - (T* x, ulong y);
//
temp.Add (new PredefinedPointerOperator (null, TypeManager.int32_type, Operator.AdditionMask | Operator.SubtractionMask));
temp.Add (new PredefinedPointerOperator (null, TypeManager.uint32_type, Operator.AdditionMask | Operator.SubtractionMask));
temp.Add (new PredefinedPointerOperator (null, TypeManager.int64_type, Operator.AdditionMask | Operator.SubtractionMask));
temp.Add (new PredefinedPointerOperator (null, TypeManager.uint64_type, Operator.AdditionMask | Operator.SubtractionMask));
//
// T* operator + (int y, T* x);
// T* operator + (uint y, T *x);
// T* operator + (long y, T *x);
// T* operator + (ulong y, T *x);
//
temp.Add (new PredefinedPointerOperator (TypeManager.int32_type, null, Operator.AdditionMask, null));
temp.Add (new PredefinedPointerOperator (TypeManager.uint32_type, null, Operator.AdditionMask, null));
temp.Add (new PredefinedPointerOperator (TypeManager.int64_type, null, Operator.AdditionMask, null));
temp.Add (new PredefinedPointerOperator (TypeManager.uint64_type, null, Operator.AdditionMask, null));
//
// long operator - (T* x, T *y)
//
temp.Add (new PredefinedPointerOperator (null, Operator.SubtractionMask, TypeManager.int64_type));
pointer_operators = (PredefinedOperator []) temp.ToArray (typeof (PredefinedOperator));
}
static void CreateStandardOperatorsTable ()
{
ArrayList temp = new ArrayList ();
Type bool_type = TypeManager.bool_type;
temp.Add (new PredefinedOperator (TypeManager.int32_type, Operator.ArithmeticMask | Operator.BitwiseMask));
temp.Add (new PredefinedOperator (TypeManager.uint32_type, Operator.ArithmeticMask | Operator.BitwiseMask));
temp.Add (new PredefinedOperator (TypeManager.int64_type, Operator.ArithmeticMask | Operator.BitwiseMask));
temp.Add (new PredefinedOperator (TypeManager.uint64_type, Operator.ArithmeticMask | Operator.BitwiseMask));
temp.Add (new PredefinedOperator (TypeManager.float_type, Operator.ArithmeticMask));
temp.Add (new PredefinedOperator (TypeManager.double_type, Operator.ArithmeticMask));
temp.Add (new PredefinedOperator (TypeManager.decimal_type, Operator.ArithmeticMask));
temp.Add (new PredefinedOperator (TypeManager.int32_type, Operator.ComparisonMask, bool_type));
temp.Add (new PredefinedOperator (TypeManager.uint32_type, Operator.ComparisonMask, bool_type));
temp.Add (new PredefinedOperator (TypeManager.int64_type, Operator.ComparisonMask, bool_type));
temp.Add (new PredefinedOperator (TypeManager.uint64_type, Operator.ComparisonMask, bool_type));
temp.Add (new PredefinedOperator (TypeManager.float_type, Operator.ComparisonMask, bool_type));
temp.Add (new PredefinedOperator (TypeManager.double_type, Operator.ComparisonMask, bool_type));
temp.Add (new PredefinedOperator (TypeManager.decimal_type, Operator.ComparisonMask, bool_type));
temp.Add (new PredefinedOperator (TypeManager.string_type, Operator.EqualityMask, bool_type));
temp.Add (new PredefinedStringOperator (TypeManager.string_type, Operator.AdditionMask));
temp.Add (new PredefinedStringOperator (TypeManager.string_type, TypeManager.object_type, Operator.AdditionMask));
temp.Add (new PredefinedStringOperator (TypeManager.object_type, TypeManager.string_type, Operator.AdditionMask));
temp.Add (new PredefinedOperator (bool_type,
Operator.BitwiseMask | Operator.LogicalMask | Operator.EqualityMask, bool_type));
temp.Add (new PredefinedShiftOperator (TypeManager.int32_type, Operator.ShiftMask));
temp.Add (new PredefinedShiftOperator (TypeManager.uint32_type, Operator.ShiftMask));
temp.Add (new PredefinedShiftOperator (TypeManager.int64_type, Operator.ShiftMask));
temp.Add (new PredefinedShiftOperator (TypeManager.uint64_type, Operator.ShiftMask));
standard_operators = (PredefinedOperator []) temp.ToArray (typeof (PredefinedOperator));
}
//
// Rules used during binary numeric promotion
//
static bool DoNumericPromotion (ref Expression prim_expr, ref Expression second_expr, Type type)
{
Expression temp;
Type etype;
Constant c = prim_expr as Constant;
if (c != null) {
temp = c.ConvertImplicitly (type);
if (temp != null) {
prim_expr = temp;
return true;
}
}
if (type == TypeManager.uint32_type) {
etype = prim_expr.Type;
if (etype == TypeManager.int32_type || etype == TypeManager.short_type || etype == TypeManager.sbyte_type) {
type = TypeManager.int64_type;
if (type != second_expr.Type) {
c = second_expr as Constant;
if (c != null)
temp = c.ConvertImplicitly (type);
else
temp = Convert.ImplicitNumericConversion (second_expr, type);
if (temp == null)
return false;
second_expr = temp;
}
}
} else if (type == TypeManager.uint64_type) {
//
// A compile-time error occurs if the other operand is of type sbyte, short, int, or long
//
if (type == TypeManager.int32_type || type == TypeManager.int64_type ||
type == TypeManager.sbyte_type || type == TypeManager.sbyte_type)
return false;
}
temp = Convert.ImplicitNumericConversion (prim_expr, type);
if (temp == null)
return false;
prim_expr = temp;
return true;
}
//
// 7.2.6.2 Binary numeric promotions
//
public bool DoBinaryOperatorPromotion (ResolveContext ec)
{
Type ltype = left.Type;
Type rtype = right.Type;
Expression temp;
foreach (Type t in ConstantFold.binary_promotions) {
if (t == ltype)
return t == rtype || DoNumericPromotion (ref right, ref left, t);
if (t == rtype)
return t == ltype || DoNumericPromotion (ref left, ref right, t);
}
Type int32 = TypeManager.int32_type;
if (ltype != int32) {
Constant c = left as Constant;
if (c != null)
temp = c.ConvertImplicitly (int32);
else
temp = Convert.ImplicitNumericConversion (left, int32);
if (temp == null)
return false;
left = temp;
}
if (rtype != int32) {
Constant c = right as Constant;
if (c != null)
temp = c.ConvertImplicitly (int32);
else
temp = Convert.ImplicitNumericConversion (right, int32);
if (temp == null)
return false;
right = temp;
}
return true;
}
public override Expression DoResolve (ResolveContext 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) {
ec.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 && lc.IsDefaultValue) ||
(oper == Operator.LogicalOr && !lc.IsDefaultValue))) {
// FIXME: resolve right expression as unreachable
// right.Resolve (ec);
ec.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.HasSet (ResolveContext.Options.EnumScope) && lc != null && rc != null && (TypeManager.IsEnumType (left.Type) || TypeManager.IsEnumType (right.Type))) {
lc = EnumLiftUp (ec, lc, rc, loc);
if (lc != null)
rc = EnumLiftUp (ec, rc, lc, loc);
}
if (rc != null && lc != null) {
int prev_e = ec.Report.Errors;
Expression e = ConstantFold.BinaryFold (
ec, oper, lc, rc, loc);
if (e != null || ec.Report.Errors != prev_e)
return e;
} else if ((oper == Operator.BitwiseAnd || oper == Operator.LogicalAnd) && !TypeManager.IsDynamicType (left.Type) &&
((lc != null && lc.IsDefaultValue && !(lc is NullLiteral)) || (rc != null && rc.IsDefaultValue && !(rc is NullLiteral)))) {
if ((ResolveOperator (ec)) == null) {
Error_OperatorCannotBeApplied (ec, left, right);
return null;
}
//
// The result is a constant with side-effect
//
Constant side_effect = rc == null ?
new SideEffectConstant (lc, right, loc) :
new SideEffectConstant (rc, left, loc);
return ReducedExpression.Create (side_effect, this);
}
// Comparison warnings
if ((oper & Operator.ComparisonMask) != 0) {
if (left.Equals (right)) {
ec.Report.Warning (1718, 3, loc, "A comparison made to same variable. Did you mean to compare something else?");
}
CheckUselessComparison (ec, lc, right.Type);
CheckUselessComparison (ec, rc, left.Type);
}
if (TypeManager.IsDynamicType (left.Type) || TypeManager.IsDynamicType (right.Type)) {
Arguments args = new Arguments (2);
args.Add (new Argument (left));
args.Add (new Argument (right));
return new DynamicExpressionStatement (this, args, loc).Resolve (ec);
}
if (RootContext.Version >= LanguageVersion.ISO_2 &&
((TypeManager.IsNullableType (left.Type) && (right is NullLiteral || TypeManager.IsNullableType (right.Type) || TypeManager.IsValueType (right.Type))) ||
(TypeManager.IsValueType (left.Type) && right is NullLiteral) ||
(TypeManager.IsNullableType (right.Type) && (left is NullLiteral || TypeManager.IsNullableType (left.Type) || TypeManager.IsValueType (left.Type))) ||
(TypeManager.IsValueType (right.Type) && left is NullLiteral)))
return new Nullable.LiftedBinaryOperator (oper, left, right, loc).Resolve (ec);
return DoResolveCore (ec, left, right);
}
protected Expression DoResolveCore (ResolveContext ec, Expression left_orig, Expression right_orig)
{
Expression expr = ResolveOperator (ec);
if (expr == null)
Error_OperatorCannotBeApplied (ec, left_orig, right_orig);
if (left == null || right == null)
throw new InternalErrorException ("Invalid conversion");
if (oper == Operator.BitwiseOr)
CheckBitwiseOrOnSignExtended (ec);
return expr;
}
#if NET_4_0
public override SLE.Expression MakeExpression (BuilderContext ctx)
{
var le = left.MakeExpression (ctx);
var re = right.MakeExpression (ctx);
bool is_checked = ctx.HasSet (BuilderContext.Options.CheckedScope);
switch (oper) {
case Operator.Addition:
return is_checked ? SLE.Expression.AddChecked (le, re) : SLE.Expression.Add (le, re);
case Operator.BitwiseAnd:
return SLE.Expression.And (le, re);
case Operator.BitwiseOr:
return SLE.Expression.Or (le, re);
case Operator.Division:
return SLE.Expression.Divide (le, re);
case Operator.Equality:
return SLE.Expression.Equal (le, re);
case Operator.ExclusiveOr:
return SLE.Expression.ExclusiveOr (le, re);
case Operator.GreaterThan:
return SLE.Expression.GreaterThan (le, re);
case Operator.GreaterThanOrEqual:
return SLE.Expression.GreaterThanOrEqual (le, re);
case Operator.Inequality:
return SLE.Expression.NotEqual (le, re);
case Operator.LeftShift:
return SLE.Expression.LeftShift (le, re);
case Operator.LessThan:
return SLE.Expression.LessThan (le, re);
case Operator.LessThanOrEqual:
return SLE.Expression.LessThanOrEqual (le, re);
case Operator.LogicalAnd:
return SLE.Expression.AndAlso (le, re);
case Operator.LogicalOr:
return SLE.Expression.OrElse (le, re);
case Operator.Modulus:
return SLE.Expression.Modulo (le, re);
case Operator.Multiply:
return is_checked ? SLE.Expression.MultiplyChecked (le, re) : SLE.Expression.Multiply (le, re);
case Operator.RightShift:
return SLE.Expression.RightShift (le, re);
case Operator.Subtraction:
return is_checked ? SLE.Expression.SubtractChecked (le, re) : SLE.Expression.Subtract (le, re);
default:
throw new NotImplementedException (oper.ToString ());
}
}
#endif
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
left.MutateHoistedGenericType (storey);
right.MutateHoistedGenericType (storey);
}
//
// D operator + (D x, D y)
// D operator - (D x, D y)
// bool operator == (D x, D y)
// bool operator != (D x, D y)
//
Expression ResolveOperatorDelegate (ResolveContext ec, Type l, Type r)
{
bool is_equality = (oper & Operator.EqualityMask) != 0;
if (!TypeManager.IsEqual (l, r) && !TypeManager.IsVariantOf (r, l)) {
Expression tmp;
if (right.eclass == ExprClass.MethodGroup || (r == InternalType.AnonymousMethod && !is_equality)) {
tmp = Convert.ImplicitConversionRequired (ec, right, l, loc);
if (tmp == null)
return null;
right = tmp;
r = right.Type;
} else if (left.eclass == ExprClass.MethodGroup || (l == InternalType.AnonymousMethod && !is_equality)) {
tmp = Convert.ImplicitConversionRequired (ec, left, r, loc);
if (tmp == null)
return null;
left = tmp;
l = left.Type;
} else {
return null;
}
}
//
// Resolve delegate equality as a user operator
//
if (is_equality)
return ResolveUserOperator (ec, l, r);
MethodInfo method;
Arguments args = new Arguments (2);
args.Add (new Argument (left));
args.Add (new Argument (right));
if (oper == Operator.Addition) {
if (TypeManager.delegate_combine_delegate_delegate == null) {
TypeManager.delegate_combine_delegate_delegate = TypeManager.GetPredefinedMethod (
TypeManager.delegate_type, "Combine", loc, TypeManager.delegate_type, TypeManager.delegate_type);
}
method = TypeManager.delegate_combine_delegate_delegate;
} else {
if (TypeManager.delegate_remove_delegate_delegate == null) {
TypeManager.delegate_remove_delegate_delegate = TypeManager.GetPredefinedMethod (
TypeManager.delegate_type, "Remove", loc, TypeManager.delegate_type, TypeManager.delegate_type);
}
method = TypeManager.delegate_remove_delegate_delegate;
}
MethodGroupExpr mg = new MethodGroupExpr (new MemberInfo [] { method }, TypeManager.delegate_type, loc);
mg = mg.OverloadResolve (ec, ref args, false, loc);
return new ClassCast (new UserOperatorCall (mg, args, CreateExpressionTree, loc), l);
}
//
// Enumeration operators
//
Expression ResolveOperatorEnum (ResolveContext ec, bool lenum, bool renum, Type ltype, Type rtype)
{
//
// bool operator == (E x, E y);
// bool operator != (E x, E y);
// bool operator < (E x, E y);
// bool operator > (E x, E y);
// bool operator <= (E x, E y);
// bool operator >= (E x, E y);
//
// E operator & (E x, E y);
// E operator | (E x, E y);
// E operator ^ (E x, E y);
//
// U operator - (E e, E f)
// E operator - (E e, U x)
//
// E operator + (U x, E e)
// E operator + (E e, U x)
//
if (!((oper & (Operator.ComparisonMask | Operator.BitwiseMask)) != 0 ||
(oper == Operator.Subtraction && lenum) ||
(oper == Operator.Addition && (lenum != renum || type != null)))) // type != null for lifted null
return null;
Expression ltemp = left;
Expression rtemp = right;
Type underlying_type;
Expression expr;
if ((oper & (Operator.ComparisonMask | Operator.BitwiseMask)) != 0) {
if (renum) {
expr = Convert.ImplicitConversion (ec, left, rtype, loc);
if (expr != null) {
left = expr;
ltype = expr.Type;
}
} else if (lenum) {
expr = Convert.ImplicitConversion (ec, right, ltype, loc);
if (expr != null) {
right = expr;
rtype = expr.Type;
}
}
}
if (TypeManager.IsEqual (ltype, rtype)) {
underlying_type = TypeManager.GetEnumUnderlyingType (ltype);
if (left is Constant)
left = ((Constant) left).ConvertExplicitly (false, underlying_type);
else
left = EmptyCast.Create (left, underlying_type);
if (right is Constant)
right = ((Constant) right).ConvertExplicitly (false, underlying_type);
else
right = EmptyCast.Create (right, underlying_type);
} else if (lenum) {
underlying_type = TypeManager.GetEnumUnderlyingType (ltype);
if (oper != Operator.Subtraction && oper != Operator.Addition) {
Constant c = right as Constant;
if (c == null || !c.IsDefaultValue)
return null;
} else {
if (!Convert.ImplicitStandardConversionExists (right, underlying_type))
return null;
right = Convert.ImplicitConversionStandard (ec, right, underlying_type, right.Location);
}
if (left is Constant)
left = ((Constant) left).ConvertExplicitly (false, underlying_type);
else
left = EmptyCast.Create (left, underlying_type);
} else if (renum) {
underlying_type = TypeManager.GetEnumUnderlyingType (rtype);
if (oper != Operator.Addition) {
Constant c = left as Constant;
if (c == null || !c.IsDefaultValue)
return null;
} else {
if (!Convert.ImplicitStandardConversionExists (left, underlying_type))
return null;
left = Convert.ImplicitConversionStandard (ec, left, underlying_type, left.Location);
}
if (right is Constant)
right = ((Constant) right).ConvertExplicitly (false, underlying_type);
else
right = EmptyCast.Create (right, underlying_type);
} else {
return null;
}
//
// C# specification uses explicit cast syntax which means binary promotion
// should happen, however it seems that csc does not do that
//
if (!DoBinaryOperatorPromotion (ec)) {
left = ltemp;
right = rtemp;
return null;
}
Type res_type = null;
if ((oper & Operator.BitwiseMask) != 0 || oper == Operator.Subtraction || oper == Operator.Addition) {
Type promoted_type = lenum ? left.Type : right.Type;
enum_conversion = Convert.ExplicitNumericConversion (
new EmptyExpression (promoted_type), underlying_type);
if (oper == Operator.Subtraction && renum && lenum)
res_type = underlying_type;
else if (oper == Operator.Addition && renum)
res_type = rtype;
else
res_type = ltype;
}
expr = ResolveOperatorPredefined (ec, standard_operators, true, res_type);
if (!is_compound || expr == null)
return expr;
//
// Section: 7.16.2
//
//
// If the return type of the selected operator is implicitly convertible to the type of x
//
if (Convert.ImplicitConversionExists (ec, expr, ltype))
return expr;
//
// Otherwise, if the selected operator is a predefined operator, if the return type of the
// selected operator is explicitly convertible to the type of x, and if y is implicitly
// convertible to the type of x or the operator is a shift operator, then the operation
// is evaluated as x = (T)(x op y), where T is the type of x
//
expr = Convert.ExplicitConversion (ec, expr, ltype, loc);
if (expr == null)
return null;
if (Convert.ImplicitConversionExists (ec, ltemp, ltype))
return expr;
return null;
}
//
// 7.9.6 Reference type equality operators
//
Binary ResolveOperatorEqualityRerefence (ResolveContext ec, Type l, Type r)
{
//
// operator != (object a, object b)
// operator == (object a, object b)
//
// TODO: this method is almost equivalent to Convert.ImplicitReferenceConversion
if (left.eclass == ExprClass.MethodGroup || right.eclass == ExprClass.MethodGroup)
return null;
type = TypeManager.bool_type;
GenericConstraints constraints;
bool lgen = TypeManager.IsGenericParameter (l);
if (TypeManager.IsEqual (l, r)) {
if (lgen) {
//
// Only allow to compare same reference type parameter
//
if (TypeManager.IsReferenceType (l)) {
left = new BoxedCast (left, TypeManager.object_type);
right = new BoxedCast (right, TypeManager.object_type);
return this;
}
return null;
}
if (l == InternalType.AnonymousMethod)
return null;
if (TypeManager.IsValueType (l))
return null;
return this;
}
bool rgen = TypeManager.IsGenericParameter (r);
//
// a, Both operands are reference-type values or the value null
// b, One operand is a value of type T where T is a type-parameter and
// the other operand is the value null. Furthermore T does not have the
// value type constrain
//
if (left is NullLiteral || right is NullLiteral) {
if (lgen) {
constraints = TypeManager.GetTypeParameterConstraints (l);
if (constraints != null && constraints.HasValueTypeConstraint)
return null;
left = new BoxedCast (left, TypeManager.object_type);
return this;
}
if (rgen) {
constraints = TypeManager.GetTypeParameterConstraints (r);
if (constraints != null && constraints.HasValueTypeConstraint)
return null;
right = new BoxedCast (right, TypeManager.object_type);
return this;
}
}
//
// 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 (lgen) {
if (!TypeManager.IsReferenceType (l))
return null;
l = TypeManager.object_type;
left = new BoxedCast (left, l);
} else if (l.IsInterface) {
l = TypeManager.object_type;
} else if (TypeManager.IsStruct (l)) {
return null;
}
if (rgen) {
if (!TypeManager.IsReferenceType (r))
return null;
r = TypeManager.object_type;
right = new BoxedCast (right, r);
} else if (r.IsInterface) {
r = TypeManager.object_type;
} else if (TypeManager.IsStruct (r)) {
return null;
}
const string ref_comparison = "Possible unintended reference comparison. " +
"Consider casting the {0} side of the expression to `string' to compare the values";
//
// A standard implicit conversion exists from the type of either
// operand to the type of the other operand
//
if (Convert.ImplicitReferenceConversionExists (left, r)) {
if (l == TypeManager.string_type)
ec.Report.Warning (253, 2, loc, ref_comparison, "right");
return this;
}
if (Convert.ImplicitReferenceConversionExists (right, l)) {
if (r == TypeManager.string_type)
ec.Report.Warning (252, 2, loc, ref_comparison, "left");
return this;
}
return null;
}
Expression ResolveOperatorPointer (ResolveContext ec, Type l, Type r)
{
//
// bool operator == (void* x, void* y);
// bool operator != (void* x, void* y);
// bool operator < (void* x, void* y);
// bool operator > (void* x, void* y);
// bool operator <= (void* x, void* y);
// bool operator >= (void* x, void* y);
//
if ((oper & Operator.ComparisonMask) != 0) {
Expression temp;
if (!l.IsPointer) {
temp = Convert.ImplicitConversion (ec, left, r, left.Location);
if (temp == null)
return null;
left = temp;
}
if (!r.IsPointer) {
temp = Convert.ImplicitConversion (ec, right, l, right.Location);
if (temp == null)
return null;
right = temp;
}
type = TypeManager.bool_type;
return this;
}
if (pointer_operators == null)
CreatePointerOperatorsTable ();
return ResolveOperatorPredefined (ec, pointer_operators, false, null);
}
//
// Build-in operators method overloading
//
protected virtual Expression ResolveOperatorPredefined (ResolveContext ec, PredefinedOperator [] operators, bool primitives_only, Type enum_type)
{
PredefinedOperator best_operator = null;
Type l = left.Type;
Type r = right.Type;
Operator oper_mask = oper & ~Operator.ValuesOnlyMask;
foreach (PredefinedOperator po in operators) {
if ((po.OperatorsMask & oper_mask) == 0)
continue;
if (primitives_only) {
if (!po.IsPrimitiveApplicable (l, r))
continue;
} else {
if (!po.IsApplicable (ec, left, right))
continue;
}
if (best_operator == null) {
best_operator = po;
if (primitives_only)
break;
continue;
}
best_operator = po.ResolveBetterOperator (ec, best_operator);
if (best_operator == null) {
ec.Report.Error (34, loc, "Operator `{0}' is ambiguous on operands of type `{1}' and `{2}'",
OperName (oper), left.GetSignatureForError (), right.GetSignatureForError ());
best_operator = po;
break;
}
}
if (best_operator == null)
return null;
Expression expr = best_operator.ConvertResult (ec, this);
if (enum_type == null)
return expr;
//
// HACK: required by enum_conversion
//
expr.Type = enum_type;
return EmptyCast.Create (expr, enum_type);
}
//
// Performs user-operator overloading
//
protected virtual Expression ResolveUserOperator (ResolveContext ec, Type l, Type r)
{
Operator user_oper;
if (oper == Operator.LogicalAnd)
user_oper = Operator.BitwiseAnd;
else if (oper == Operator.LogicalOr)
user_oper = Operator.BitwiseOr;
else
user_oper = oper;
string op = GetOperatorMetadataName (user_oper);
MethodGroupExpr left_operators = MemberLookup (ec.Compiler, ec.CurrentType, l, op, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
MethodGroupExpr right_operators = null;
if (!TypeManager.IsEqual (r, l)) {
right_operators = MemberLookup (ec.Compiler, ec.CurrentType, r, op, MemberTypes.Method, AllBindingFlags, loc) as MethodGroupExpr;
if (right_operators == null && left_operators == null)
return null;
} else if (left_operators == null) {
return null;
}
Arguments args = new Arguments (2);
Argument larg = new Argument (left);
args.Add (larg);
Argument rarg = new Argument (right);
args.Add (rarg);
MethodGroupExpr union;
//
// User-defined operator implementations always take precedence
// over predefined operator implementations
//
if (left_operators != null && right_operators != null) {
if (IsPredefinedUserOperator (l, user_oper)) {
union = right_operators.OverloadResolve (ec, ref args, true, loc);
if (union == null)
union = left_operators;
} else if (IsPredefinedUserOperator (r, user_oper)) {
union = left_operators.OverloadResolve (ec, ref args, true, loc);
if (union == null)
union = right_operators;
} else {
union = MethodGroupExpr.MakeUnionSet (left_operators, right_operators, loc);
}
} else if (left_operators != null) {
union = left_operators;
} else {
union = right_operators;
}
union = union.OverloadResolve (ec, ref args, true, loc);
if (union == null)
return null;
Expression oper_expr;
// TODO: CreateExpressionTree is allocated every time
if (user_oper != oper) {
oper_expr = new ConditionalLogicalOperator (union, args, CreateExpressionTree,
oper == Operator.LogicalAnd, loc).Resolve (ec);
} else {
oper_expr = new UserOperatorCall (union, args, CreateExpressionTree, loc);
//
// This is used to check if a test 'x == null' can be optimized to a reference equals,
// and not invoke user operator
//
if ((oper & Operator.EqualityMask) != 0) {
if ((left is NullLiteral && IsBuildInEqualityOperator (r)) ||
(right is NullLiteral && IsBuildInEqualityOperator (l))) {
type = TypeManager.bool_type;
if (left is NullLiteral || right is NullLiteral)
oper_expr = ReducedExpression.Create (this, oper_expr).Resolve (ec);
} else if (l != r) {
MethodInfo mi = (MethodInfo) union;
//
// Two System.Delegate(s) are never equal
//
if (mi.DeclaringType == TypeManager.multicast_delegate_type)
return null;
}
}
}
left = larg.Expr;
right = rarg.Expr;
return oper_expr;
}
public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
{
return null;
}
private void CheckUselessComparison (ResolveContext ec, 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 (ec, 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 (ec, type);
}
static 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;
}
static bool IsBuildInEqualityOperator (Type t)
{
return t == TypeManager.object_type || t == TypeManager.string_type ||
t == TypeManager.delegate_type || TypeManager.IsDelegateType (t);
}
static bool IsPredefinedUserOperator (Type t, Operator op)
{
//
// Some predefined types have user operators
//
return (op & Operator.EqualityMask) != 0 && (t == TypeManager.string_type || t == TypeManager.decimal_type);
}
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 (ResolveContext ec, Type type)
{
ec.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));
}
/// <remarks>
/// EmitBranchable is called from Statement.EmitBoolExpression in the
/// context of a conditional bool expression. This function will return
/// false if it is was possible to use EmitBranchable, or true if it was.
///
/// The expression's code is generated, and we will generate a branch to `target'
/// if the resulting expression value is equal to isTrue
/// </remarks>
public override void EmitBranchable (EmitContext ec, Label target, bool 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.EmitBranchable (ec, target, my_on_true);
return;
}
if (right.Type == TypeManager.bool_type) {
// right is a boolean, and it's not 'false' => it is 'true'
left.EmitBranchable (ec, target, !my_on_true);
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_float = IsFloat (t);
bool is_unsigned = is_float || IsUnsigned (t);
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 && !is_float)
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 && !is_float)
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 && !is_float)
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 && !is_float)
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:
throw new InternalErrorException (oper.ToString ());
}
}
public override void Emit (EmitContext ec)
{
EmitOperator (ec, left.Type);
}
protected virtual void EmitOperator (EmitContext ec, Type l)
{
ILGenerator ig = ec.ig;
//
// Handle short-circuit operators differently
// than the rest
//
if ((oper & Operator.LogicalMask) != 0) {
Label load_result = ig.DefineLabel ();
Label end = ig.DefineLabel ();
bool is_or = oper == Operator.LogicalOr;
left.EmitBranchable (ec, load_result, is_or);
right.Emit (ec);
ig.Emit (OpCodes.Br_S, end);
ig.MarkLabel (load_result);
ig.Emit (is_or ? OpCodes.Ldc_I4_1 : OpCodes.Ldc_I4_0);
ig.MarkLabel (end);
return;
}
left.Emit (ec);
//
// Optimize zero-based operations
//
// TODO: Implement more optimizations, but it should probably go to PredefinedOperators
//
if ((oper & Operator.ShiftMask) != 0 || oper == Operator.Addition || oper == Operator.Subtraction) {
Constant rc = right as Constant;
if (rc != null && rc.IsDefaultValue) {
return;
}
}
right.Emit (ec);
EmitOperatorOpcode (ec, oper, l);
//
// Nullable enum could require underlying type cast and we cannot simply wrap binary
// expression because that would wrap lifted binary operation
//
if (enum_conversion != null)
enum_conversion.Emit (ec);
}
public override void EmitSideEffect (EmitContext ec)
{
if ((oper & Operator.LogicalMask) != 0 ||
(ec.HasSet (EmitContext.Options.CheckedScope) && (oper == Operator.Multiply || oper == Operator.Addition || oper == Operator.Subtraction))) {
base.EmitSideEffect (ec);
} else {
left.EmitSideEffect (ec);
right.EmitSideEffect (ec);
}
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Binary target = (Binary) t;
target.left = left.Clone (clonectx);
target.right = right.Clone (clonectx);
}
public Expression CreateCallSiteBinder (ResolveContext ec, Arguments args)
{
Arguments binder_args = new Arguments (4);
MemberAccess sle = new MemberAccess (new MemberAccess (
new QualifiedAliasMember (QualifiedAliasMember.GlobalAlias, "System", loc), "Linq", loc), "Expressions", loc);
MemberAccess binder = DynamicExpressionStatement.GetBinderNamespace (loc);
binder_args.Add (new Argument (new MemberAccess (new MemberAccess (sle, "ExpressionType", loc), GetOperatorExpressionTypeName (), loc)));
binder_args.Add (new Argument (new BoolLiteral (ec.HasSet (ResolveContext.Options.CheckedScope), loc)));
bool member_access = left is DynamicMemberBinder || right is DynamicMemberBinder;
binder_args.Add (new Argument (new BoolLiteral (member_access, loc)));
binder_args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", args.CreateDynamicBinderArguments (), loc)));
return new New (new MemberAccess (binder, "CSharpBinaryOperationBinder", loc), binder_args, loc);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return CreateExpressionTree (ec, null);
}
Expression CreateExpressionTree (ResolveContext ec, MethodGroupExpr method)
{
string method_name;
bool lift_arg = false;
switch (oper) {
case Operator.Addition:
if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
method_name = "AddChecked";
else
method_name = "Add";
break;
case Operator.BitwiseAnd:
method_name = "And";
break;
case Operator.BitwiseOr:
method_name = "Or";
break;
case Operator.Division:
method_name = "Divide";
break;
case Operator.Equality:
method_name = "Equal";
lift_arg = true;
break;
case Operator.ExclusiveOr:
method_name = "ExclusiveOr";
break;
case Operator.GreaterThan:
method_name = "GreaterThan";
lift_arg = true;
break;
case Operator.GreaterThanOrEqual:
method_name = "GreaterThanOrEqual";
lift_arg = true;
break;
case Operator.Inequality:
method_name = "NotEqual";
lift_arg = true;
break;
case Operator.LeftShift:
method_name = "LeftShift";
break;
case Operator.LessThan:
method_name = "LessThan";
lift_arg = true;
break;
case Operator.LessThanOrEqual:
method_name = "LessThanOrEqual";
lift_arg = true;
break;
case Operator.LogicalAnd:
method_name = "AndAlso";
break;
case Operator.LogicalOr:
method_name = "OrElse";
break;
case Operator.Modulus:
method_name = "Modulo";
break;
case Operator.Multiply:
if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
method_name = "MultiplyChecked";
else
method_name = "Multiply";
break;
case Operator.RightShift:
method_name = "RightShift";
break;
case Operator.Subtraction:
if (method == null && ec.HasSet (ResolveContext.Options.CheckedScope) && !IsFloat (type))
method_name = "SubtractChecked";
else
method_name = "Subtract";
break;
default:
throw new InternalErrorException ("Unknown expression tree binary operator " + oper);
}
Arguments args = new Arguments (2);
args.Add (new Argument (left.CreateExpressionTree (ec)));
args.Add (new Argument (right.CreateExpressionTree (ec)));
if (method != null) {
if (lift_arg)
args.Add (new Argument (new BoolConstant (false, loc)));
args.Add (new Argument (method.CreateExpressionTree (ec)));
}
return CreateExpressionFactoryCall (ec, method_name, args);
}
}
//
// Represents the operation a + b [+ c [+ d [+ ...]]], where a is a string
// b, c, d... may be strings or objects.
//
public class StringConcat : Expression {
Arguments arguments;
public StringConcat (Location loc, Expression left, Expression right)
{
this.loc = loc;
type = TypeManager.string_type;
eclass = ExprClass.Value;
arguments = new Arguments (2);
Append (left);
Append (right);
}
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().ManyUntyped("arguments", arguments.args);
}
public override string GetNameX()
{
return null;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Argument arg = arguments [0];
return CreateExpressionAddCall (ec, arg, arg.CreateExpressionTree (ec), 1);
}
//
// Creates nested calls tree from an array of arguments used for IL emit
//
Expression CreateExpressionAddCall (ResolveContext ec, Argument left, Expression left_etree, int pos)
{
Arguments concat_args = new Arguments (2);
Arguments add_args = new Arguments (3);
concat_args.Add (left);
add_args.Add (new Argument (left_etree));
concat_args.Add (arguments [pos]);
add_args.Add (new Argument (arguments [pos].CreateExpressionTree (ec)));
MethodGroupExpr method = CreateConcatMemberExpression ().Resolve (ec) as MethodGroupExpr;
if (method == null)
return null;
method = method.OverloadResolve (ec, ref concat_args, false, loc);
if (method == null)
return null;
add_args.Add (new Argument (method.CreateExpressionTree (ec)));
Expression expr = CreateExpressionFactoryCall (ec, "Add", add_args);
if (++pos == arguments.Count)
return expr;
left = new Argument (new EmptyExpression (((MethodInfo)method).ReturnType));
return CreateExpressionAddCall (ec, left, expr, pos);
}
public override Expression DoResolve (ResolveContext ec)
{
return this;
}
public void Append (Expression operand)
{
//
// Constant folding
//
StringConstant sc = operand as StringConstant;
if (sc != null) {
if (arguments.Count != 0) {
Argument last_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;
}
}
arguments.Add (new Argument (operand));
}
Expression CreateConcatMemberExpression ()
{
return new MemberAccess (new MemberAccess (new QualifiedAliasMember ("global", "System", loc), "String", loc), "Concat", loc);
}
public override void Emit (EmitContext ec)
{
Expression concat = new Invocation (CreateConcatMemberExpression (), arguments, true);
concat = concat.Resolve (new ResolveContext (ec.MemberContext));
if (concat != null)
concat.Emit (ec);
}
#if NET_4_0
public override SLE.Expression MakeExpression (BuilderContext ctx)
{
if (arguments.Count != 2)
throw new NotImplementedException ("arguments.Count != 2");
var concat = TypeManager.string_type.GetMethod ("Concat", new[] { typeof (object), typeof (object) });
return SLE.Expression.Add (arguments[0].Expr.MakeExpression (ctx), arguments[1].Expr.MakeExpression (ctx), concat);
}
#endif
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
arguments.MutateHoistedGenericType (storey);
}
}
//
// User-defined conditional logical operator
//
public class ConditionalLogicalOperator : UserOperatorCall {
readonly bool is_and;
Expression oper;
public ConditionalLogicalOperator (MethodGroupExpr oper_method, Arguments arguments,
ExpressionTreeExpression expr_tree, bool is_and, Location loc)
: base (oper_method, arguments, expr_tree, loc)
{
this.is_and = is_and;
}
public override Expression DoResolve (ResolveContext ec)
{
MethodInfo method = (MethodInfo)mg;
type = TypeManager.TypeToCoreType (method.ReturnType);
AParametersCollection pd = TypeManager.GetParameterData (method);
if (!TypeManager.IsEqual (type, type) || !TypeManager.IsEqual (type, pd.Types [0]) || !TypeManager.IsEqual (type, pd.Types [1])) {
ec.Report.Error (217, loc,
"A user-defined operator `{0}' must have parameters and return values of the same type in order to be applicable as a short circuit operator",
TypeManager.CSharpSignature (method));
return null;
}
Expression left_dup = new EmptyExpression (type);
Expression op_true = GetOperatorTrue (ec, left_dup, loc);
Expression op_false = GetOperatorFalse (ec, left_dup, loc);
if (op_true == null || op_false == null) {
ec.Report.Error (218, loc,
"The type `{0}' must have operator `true' and operator `false' defined when `{1}' is used as a short circuit operator",
TypeManager.CSharpName (type), TypeManager.CSharpSignature (method));
return null;
}
oper = is_and ? op_false : op_true;
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
ILGenerator ig = ec.ig;
Label end_target = ig.DefineLabel ();
//
// Emit and duplicate left argument
//
arguments [0].Expr.Emit (ec);
ig.Emit (OpCodes.Dup);
arguments.RemoveAt (0);
oper.EmitBranchable (ec, end_target, true);
base.Emit (ec);
ig.MarkLabel (end_target);
}
}
public class PointerArithmetic : Expression {
Expression left, right;
Binary.Operator op;
//
// We assume that `l' is always a pointer
//
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("left", left).Single("right", right);
}
public override string GetNameX()
{
return null;
}
public PointerArithmetic (Binary.Operator op, Expression l, Expression r, Type t, Location loc)
{
type = t;
this.loc = loc;
left = l;
right = r;
this.op = op;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Error_PointerInsideExpressionTree (ec);
return null;
}
public override Expression DoResolve (ResolveContext ec)
{
eclass = ExprClass.Variable;
if (left.Type == TypeManager.void_ptr_type) {
ec.Report.Error (242, loc, "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;
if (TypeManager.HasElementType (op_type)) {
element = TypeManager.GetElementType (op_type);
} else {
FieldExpr fe = left as FieldExpr;
if (fe != null)
element = AttributeTester.GetFixedBuffer (fe.FieldInfo).ElementType;
else
element = op_type;
}
int size = GetTypeSize (element);
Type rtype = right.Type;
if ((op & Binary.Operator.SubtractionMask) != 0 && 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)
//
Constant left_const = left as Constant;
if (left_const != null) {
//
// Optimize ((T*)null) pointer operations
//
if (left_const.IsDefaultValue) {
left = EmptyExpression.Null;
} else {
left_const = null;
}
}
left.Emit (ec);
Constant right_const = right as Constant;
if (right_const != null) {
//
// Optimize 0-based arithmetic
//
if (right_const.IsDefaultValue)
return;
if (size != 0) {
// TODO: Should be the checks resolve context sensitive?
ResolveContext rc = new ResolveContext (ec.MemberContext);
right = ConstantFold.BinaryFold (rc, Binary.Operator.Multiply, new IntConstant (size, right.Location), right_const, loc);
if (right == null)
return;
} else {
ig.Emit (OpCodes.Sizeof, element);
right = EmptyExpression.Null;
}
}
right.Emit (ec);
if (rtype == TypeManager.sbyte_type || rtype == TypeManager.byte_type ||
rtype == TypeManager.short_type || rtype == TypeManager.ushort_type) {
ig.Emit (OpCodes.Conv_I);
} else if (rtype == TypeManager.uint32_type) {
ig.Emit (OpCodes.Conv_U);
}
if (right_const == null && size != 1){
if (size == 0)
ig.Emit (OpCodes.Sizeof, element);
else
IntLiteral.EmitInt (ig, size);
if (rtype == TypeManager.int64_type || rtype == TypeManager.uint64_type)
ig.Emit (OpCodes.Conv_I8);
Binary.EmitOperatorOpcode (ec, Binary.Operator.Multiply, rtype);
}
if (left_const == null) {
if (rtype == TypeManager.int64_type)
ig.Emit (OpCodes.Conv_I);
else if (rtype == TypeManager.uint64_type)
ig.Emit (OpCodes.Conv_U);
Binary.EmitOperatorOpcode (ec, op, op_type);
}
}
}
}
/// <summary>
/// Implements the ternary conditional operator (?:)
/// </summary>
public class Conditional : Expression {
Expression expr, true_expr, false_expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("expr", expr)
.Single("true_expr", true_expr)
.Single("false_expr", false_expr);
}
public override string GetNameX()
{
return null;
}
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 CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (3);
args.Add (new Argument (expr.CreateExpressionTree (ec)));
args.Add (new Argument (true_expr.CreateExpressionTree (ec)));
args.Add (new Argument (false_expr.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall (ec, "Condition", args);
}
public override Expression DoResolve (ResolveContext ec)
{
expr = Expression.ResolveBoolean (ec, expr, loc);
Assign ass = expr as Assign;
if (ass != null && ass.Source is Constant) {
ec.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 || expr == null)
return null;
eclass = ExprClass.Value;
Type true_type = true_expr.Type;
Type false_type = false_expr.Type;
type = true_type;
//
// First, if an implicit conversion exists from true_expr
// to false_expr, then the result type is of type false_expr.Type
//
if (!TypeManager.IsEqual (true_type, false_type)) {
Expression 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) {
ec.Report.Error (172, loc,
"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) {
false_expr = conv;
} else {
ec.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
Constant c = expr as Constant;
if (c != null){
bool is_false = c.IsDefaultValue;
ec.Report.Warning (429, 4, is_false ? true_expr.Location : false_expr.Location, "Unreachable expression code detected");
return ReducedExpression.Create (is_false ? false_expr : true_expr, this).Resolve (ec);
}
return this;
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
expr.MutateHoistedGenericType (storey);
true_expr.MutateHoistedGenericType (storey);
false_expr.MutateHoistedGenericType (storey);
type = storey.MutateType (type);
}
public override TypeExpr ResolveAsTypeTerminal (IMemberContext 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);
if (type.IsInterface) {
LocalBuilder temp = ec.GetTemporaryLocal (type);
ig.Emit (OpCodes.Stloc, temp);
ig.Emit (OpCodes.Ldloc, temp);
ec.FreeTemporaryLocal (temp, type);
}
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, IVariableReference {
LocalTemporary temp;
#region Abstract
public abstract HoistedVariable GetHoistedVariable (AnonymousExpression ae);
public abstract bool IsFixed { get; }
public abstract bool IsRef { get; }
public abstract string Name { get; }
public abstract void SetHasAddressTaken ();
//
// Variable IL data, it has to be protected to encapsulate hoisted variables
//
protected abstract ILocalVariable Variable { get; }
//
// Variable flow-analysis data
//
public abstract VariableInfo VariableInfo { get; }
#endregion
public void AddressOf (EmitContext ec, AddressOp mode)
{
HoistedVariable hv = GetHoistedVariable (ec);
if (hv != null) {
hv.AddressOf (ec, mode);
return;
}
Variable.EmitAddressOf (ec);
}
public HoistedVariable GetHoistedVariable (ResolveContext rc)
{
return GetHoistedVariable (rc.CurrentAnonymousMethod);
}
public HoistedVariable GetHoistedVariable (EmitContext ec)
{
return GetHoistedVariable (ec.CurrentAnonymousMethod);
}
public override void Emit (EmitContext ec)
{
Emit (ec, false);
}
public override void EmitSideEffect (EmitContext ec)
{
// do nothing
}
//
// 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)
{
Variable.Emit (ec);
}
public void Emit (EmitContext ec, bool leave_copy)
{
Report.Debug (64, "VARIABLE EMIT", this, Variable, type, IsRef, loc);
HoistedVariable hv = GetHoistedVariable (ec);
if (hv != null) {
hv.Emit (ec, leave_copy);
return;
}
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) {
temp = new LocalTemporary (Type);
temp.Store (ec);
}
}
}
public void EmitAssign (EmitContext ec, Expression source, bool leave_copy,
bool prepare_for_load)
{
HoistedVariable hv = GetHoistedVariable (ec);
if (hv != null) {
hv.EmitAssign (ec, source, leave_copy, prepare_for_load);
return;
}
New n_source = source as New;
if (n_source != null) {
if (!n_source.Emit (ec, this)) {
if (leave_copy)
EmitLoad (ec);
return;
}
} else {
if (IsRef)
EmitLoad (ec);
source.Emit (ec);
}
if (leave_copy) {
ec.ig.Emit (OpCodes.Dup);
if (IsRef) {
temp = new LocalTemporary (Type);
temp.Store (ec);
}
}
if (IsRef)
StoreFromPtr (ec.ig, type);
else
Variable.EmitAssign (ec);
if (temp != null) {
temp.Emit (ec);
temp.Release (ec);
}
}
public bool IsHoisted {
get { return GetHoistedVariable ((AnonymousExpression) null) != null; }
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
}
}
/// <summary>
/// Local variables
/// </summary>
public class LocalVariableReference : VariableReference {
readonly string name;
public Block Block;
public LocalInfo local_info;
bool is_readonly;
bool resolved; // TODO: merge with eclass
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("Block", Block);
}
public override string GetNameX()
{
return name;
}
public LocalVariableReference (Block block, string name, Location l)
{
Block = block;
this.name = name;
loc = l;
}
//
// 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 override VariableInfo VariableInfo {
get { return local_info.VariableInfo; }
}
public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
{
return local_info.HoistedVariableReference;
}
//
// A local variable is always fixed
//
public override bool IsFixed {
get { return true; }
}
public override bool IsRef {
get { return false; }
}
public bool IsReadOnly {
get { return is_readonly; }
}
public override string Name {
get { return name; }
}
public bool VerifyAssigned (ResolveContext 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;
}
}
public override void SetHasAddressTaken ()
{
local_info.AddressTaken = true;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
HoistedVariable hv = GetHoistedVariable (ec);
if (hv != null)
return hv.CreateExpressionTree (ec);
Arguments arg = new Arguments (1);
arg.Add (new Argument (this));
return CreateExpressionFactoryCall (ec, "Constant", arg);
}
Expression DoResolveBase (ResolveContext ec)
{
type = local_info.VariableType;
Expression e = Block.GetConstantExpression (Name);
if (e != null)
return e.Resolve (ec);
VerifyAssigned (ec);
//
// If we are referencing a variable from the external block
// flag it for capturing
//
if (ec.MustCaptureVariable (local_info)) {
if (local_info.AddressTaken)
AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, this, loc);
if (ec.IsVariableCapturingRequired) {
AnonymousMethodStorey storey = local_info.Block.Explicit.CreateAnonymousMethodStorey (ec);
storey.CaptureLocalVariable (ec, local_info);
}
}
resolved |= ec.DoFlowAnalysis;
eclass = ExprClass.Variable;
return this;
}
public override Expression DoResolve (ResolveContext ec)
{
if (resolved)
return this;
ResolveLocalInfo ();
local_info.Used = true;
if (type == null && local_info.Type is VarExpr) {
local_info.VariableType = TypeManager.object_type;
Error_VariableIsUsedBeforeItIsDeclared (ec.Report, Name);
return null;
}
return DoResolveBase (ec);
}
public override Expression DoResolveLValue (ResolveContext 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) {
if (!ve.InferType (ec, right_side))
return null;
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 if (right_side == EmptyExpression.UnaryAddress) {
code = 459; msg = "Cannot take the address of {1} `{0}'";
} else {
code = 1656; msg = "Cannot assign to `{0}' because it is a `{1}'";
}
ec.Report.Error (code, loc, msg, Name, local_info.GetReadOnlyContext ());
} else if (VariableInfo != null) {
VariableInfo.SetAssigned (ec);
}
return DoResolveBase (ec);
}
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;
}
protected override ILocalVariable Variable {
get { return local_info; }
}
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);
}
}
/// <summary>
/// This represents a reference to a parameter in the intermediate
/// representation.
/// </summary>
public class ParameterReference : VariableReference {
readonly ToplevelParameterInfo pi;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public ParameterReference (ToplevelParameterInfo pi, Location loc)
{
this.pi = pi;
this.loc = loc;
}
public override bool IsRef {
get { return (pi.Parameter.ModFlags & Parameter.Modifier.ISBYREF) != 0; }
}
bool HasOutModifier {
get { return pi.Parameter.ModFlags == Parameter.Modifier.OUT; }
}
public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
{
return pi.Parameter.HoistedVariableReference;
}
//
// A ref or out parameter is classified as a moveable variable, even
// if the argument given for the parameter is a fixed variable
//
public override bool IsFixed {
get { return !IsRef; }
}
public override string Name {
get { return Parameter.Name; }
}
public Parameter Parameter {
get { return pi.Parameter; }
}
public override VariableInfo VariableInfo {
get { return pi.VariableInfo; }
}
protected override ILocalVariable Variable {
get { return Parameter; }
}
public bool IsAssigned (ResolveContext ec, Location loc)
{
// HACK: Variables are not captured in probing mode
if (ec.IsInProbingMode)
return true;
if (!ec.DoFlowAnalysis || !HasOutModifier || ec.CurrentBranching.IsAssigned (VariableInfo))
return true;
ec.Report.Error (269, loc, "Use of unassigned out parameter `{0}'", Name);
return false;
}
public override void SetHasAddressTaken ()
{
Parameter.HasAddressTaken = true;
}
void SetAssigned (ResolveContext ec)
{
if (HasOutModifier && ec.DoFlowAnalysis)
ec.CurrentBranching.SetAssigned (VariableInfo);
}
bool DoResolveBase (ResolveContext ec)
{
type = pi.ParameterType;
eclass = ExprClass.Variable;
AnonymousExpression am = ec.CurrentAnonymousMethod;
if (am == null)
return true;
Block b = ec.CurrentBlock;
while (b != null) {
IParameterData[] p = b.Toplevel.Parameters.FixedParameters;
for (int i = 0; i < p.Length; ++i) {
if (p [i] != Parameter)
continue;
//
// Skip closest anonymous method parameters
//
if (b == ec.CurrentBlock && !am.IsIterator)
return true;
if (IsRef) {
ec.Report.Error (1628, loc,
"Parameter `{0}' cannot be used inside `{1}' when using `ref' or `out' modifier",
Name, am.ContainerType);
}
b = null;
break;
}
if (b != null)
b = b.Toplevel.Parent;
}
if (pi.Parameter.HasAddressTaken)
AnonymousMethodExpression.Error_AddressOfCapturedVar (ec, this, loc);
if (ec.IsVariableCapturingRequired) {
AnonymousMethodStorey storey = pi.Block.CreateAnonymousMethodStorey (ec);
storey.CaptureParameter (ec, this);
}
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;
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
// Nothing to clone
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
HoistedVariable hv = GetHoistedVariable (ec);
if (hv != null)
return hv.CreateExpressionTree (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 (ResolveContext ec)
{
if (!DoResolveBase (ec))
return null;
// HACK: Variables are not captured in probing mode
if (ec.IsInProbingMode)
return this;
if (HasOutModifier && ec.DoFlowAnalysis &&
(!ec.OmitStructFlowAnalysis || !VariableInfo.TypeInfo.IsStruct) && !IsAssigned (ec, loc))
return null;
return this;
}
override public Expression DoResolveLValue (ResolveContext 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)
{
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:
if (x > byte.MaxValue)
ig.Emit (OpCodes.Ldarg, x);
else
ig.Emit (OpCodes.Ldarg_S, (byte) x);
break;
}
}
}
/// <summary>
/// Invocation of methods or delegates.
/// </summary>
public class Invocation : ExpressionStatement
{
protected Arguments arguments;
protected Expression expr;
protected MethodGroupExpr mg;
bool arguments_resolved;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
if (arguments != null)
return Visitable.Container().Single("expr", expr)
.ManyUntyped("arguments", arguments.args);
return Visitable.Container().Single("expr", expr);
}
public override string GetNameX()
{
return null;
}
//
// arguments is an ArrayList, but we do not want to typecast,
// as it might be null.
//
public Invocation (Expression expr, Arguments arguments)
{
SimpleName sn = expr as SimpleName;
if (sn != null)
this.expr = sn.GetMethodGroup ();
else
this.expr = expr;
this.arguments = arguments;
if (expr != null)
loc = expr.Location;
}
public Invocation (Expression expr, Arguments arguments, bool arguments_resolved)
: this (expr, arguments)
{
this.arguments_resolved = arguments_resolved;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args;
//
// Special conversion for nested expression trees
//
if (TypeManager.DropGenericTypeArguments (type) == TypeManager.expression_type) {
args = new Arguments (1);
args.Add (new Argument (this));
return CreateExpressionFactoryCall (ec, "Quote", args);
}
Expression instance = mg.IsInstance ?
mg.InstanceExpression.CreateExpressionTree (ec) :
new NullLiteral (loc);
args = Arguments.CreateForExpressionTree (ec, arguments,
instance,
mg.CreateExpressionTree (ec));
if (mg.IsBase)
MemberExpr.Error_BaseAccessInExpressionTree (ec, loc);
return CreateExpressionFactoryCall (ec, "Call", args);
}
public override Expression DoResolve (ResolveContext 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;
//
// Next, evaluate all the expressions in the argument list
//
bool dynamic_arg = false;
if (arguments != null && !arguments_resolved)
arguments.Resolve (ec, out dynamic_arg);
Type expr_type = expr_resolved.Type;
mg = expr_resolved as MethodGroupExpr;
if (dynamic_arg || TypeManager.IsDynamicType (expr_type)) {
Arguments args;
DynamicMemberBinder dmb = expr_resolved as DynamicMemberBinder;
if (dmb != null) {
args = dmb.Arguments;
if (arguments != null)
args.AddRange (arguments);
} else if (mg == null) {
if (arguments == null)
args = new Arguments (1);
else
args = arguments;
args.Insert (0, new Argument (expr_resolved));
expr = null;
} else {
if (mg.IsBase) {
ec.Report.Error (1971, loc,
"The base call to method `{0}' cannot be dynamically dispatched. Consider casting the dynamic arguments or eliminating the base access",
mg.Name);
return null;
}
args = arguments;
if (mg.IsStatic != mg.IsInstance) {
if (args == null)
args = new Arguments (1);
if (mg.IsStatic) {
args.Insert (0, new Argument (new TypeOf (new TypeExpression (mg.DeclaringType, loc), loc).Resolve (ec), Argument.AType.DynamicStatic));
} else {
MemberAccess ma = expr as MemberAccess;
if (ma != null)
args.Insert (0, new Argument (ma.Left.Resolve (ec)));
else
args.Insert (0, new Argument (new This (loc).Resolve (ec)));
}
}
}
return new DynamicInvocation (expr as ATypeNameExpression, args, loc).Resolve (ec);
}
if (mg == null) {
if (expr_type != null && TypeManager.IsDelegateType (expr_type)){
return (new DelegateInvocation (
expr_resolved, arguments, loc)).Resolve (ec);
}
MemberExpr me = expr_resolved as MemberExpr;
if (me == null) {
expr_resolved.Error_UnexpectedKind (ec, ResolveFlags.MethodGroup, loc);
return null;
}
mg = ec.LookupExtensionMethod (me.Type, me.Name, loc);
if (mg == null) {
ec.Report.Error (1955, loc, "The member `{0}' cannot be used as method or delegate",
expr_resolved.GetSignatureForError ());
return null;
}
((ExtensionMethodGroupExpr)mg).ExtensionExpression = me.InstanceExpression;
}
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 (ec, loc, mg.GetSignatureForError ());
return null;
}
} else {
if (iexpr == null || iexpr == EmptyExpression.Null) {
SimpleName.Error_ObjectRefRequired (ec, loc, mg.GetSignatureForError ());
}
}
}
if (type.IsPointer){
if (!ec.IsUnsafe){
UnsafeError (ec, loc);
return null;
}
}
//
// Only base will allow this invocation to happen.
//
if (mg.IsBase && method.IsAbstract){
Error_CannotCallAbstractBase (ec, TypeManager.CSharpSignature (method));
return null;
}
if (arguments == null && method.DeclaringType == TypeManager.object_type && method.Name == Destructor.MetadataName) {
if (mg.IsBase)
ec.Report.Error (250, loc, "Do not directly call your base class Finalize method. It is called automatically from your destructor");
else
ec.Report.Error (245, loc, "Destructors and object.Finalize cannot be called directly. Consider calling IDisposable.Dispose if available");
return null;
}
IsSpecialMethodInvocation (ec, method, loc);
if (mg.InstanceExpression != null)
mg.InstanceExpression.CheckMarshalByRefAccess (ec);
eclass = ExprClass.Value;
return this;
}
protected virtual MethodGroupExpr DoResolveOverload (ResolveContext ec)
{
return mg.OverloadResolve (ec, ref arguments, false, loc);
}
public static bool IsSpecialMethodInvocation (ResolveContext ec, MethodBase method, Location loc)
{
if (!TypeManager.IsSpecialMethod (method))
return false;
ec.Report.SymbolRelatedToPreviousError (method);
ec.Report.Error (571, loc, "`{0}': cannot explicitly call operator or accessor",
TypeManager.CSharpSignature (method, true));
return true;
}
static Type[] GetVarargsTypes (MethodBase mb, Arguments arguments)
{
AParametersCollection pd = TypeManager.GetParameterData (mb);
Argument a = arguments [pd.Count - 1];
Arglist list = (Arglist) a.Expr;
return list.ArgumentTypes;
}
/// <summary>
/// This checks the ConditionalAttribute on the method
/// </summary>
public static bool IsMethodExcluded (MethodBase method, Location loc)
{
if (method.IsConstructor)
return false;
method = TypeManager.DropGenericMethodArguments (method);
if (method.DeclaringType.Module == RootContext.ToplevelTypes.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, loc);
}
/// <remarks>
/// is_base tells whether we want to force the use of the `call'
/// opcode instead of using callvirt. Call is required to call
/// a specific method, while callvirt will always use the most
/// recent method in the vtable.
///
/// is_static tells whether this is an invocation on a static method
///
/// instance_expr is an expression that represents the instance
/// it must be non-null if is_static is false.
///
/// method is the method to invoke.
///
/// Arguments is the list of arguments to pass to the method or constructor.
/// </remarks>
public static void EmitCall (EmitContext ec, bool is_base,
Expression instance_expr,
MethodBase method, Arguments 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, Arguments 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 (IsMethodExcluded (method, loc))
return;
bool is_static = method.IsStatic;
if (!is_static){
this_call = instance_expr is This;
if (TypeManager.IsStruct (decl_type) || TypeManager.IsEnumType (decl_type))
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) || TypeManager.IsGenericParameter (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 (TypeManager.IsStruct (decl_type) ||
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);
// FIXME: should use instance_expr is IMemoryLocation + constraint.
// to help JIT to produce better code
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 && Arguments != null)
Arguments.Emit (ec, dup_args, this_arg);
OpCode call_op;
if (is_static || struct_call || is_base || (this_call && !method.IsVirtual)) {
call_op = OpCodes.Call;
} else {
call_op = OpCodes.Callvirt;
#if GMCS_SOURCE
if ((instance_expr != null) && (instance_expr.Type.IsGenericParameter))
ig.Emit (OpCodes.Constrained, instance_expr.Type);
#endif
}
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 = arguments.Clone (clonectx);
target.expr = expr.Clone (clonectx);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
mg.MutateHoistedGenericType (storey);
type = storey.MutateType (type);
if (arguments != null) {
arguments.MutateHoistedGenericType (storey);
}
}
}
/*
//
// It's either a cast or delegate invocation
//
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 CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
Expression e = ResolveCore (ec);
if (e == null)
return null;
return e.Resolve (ec);
}
Expression ResolveCore (EmitContext ec)
{
//
// First try to resolve it as a cast.
//
TypeExpr te = expr.ResolveAsBaseTerminal (ec, true);
if (te != null) {
return new Cast (te, argument, loc);
}
//
// 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 || expr.eclass == ExprClass.TypeParameter) {
return new Cast (expr, argument, loc);
}
if (expr.eclass == ExprClass.Namespace) {
expr.Error_UnexpectedKind (null, "type", loc);
return null;
}
//
// It's a delegate invocation.
//
if (!TypeManager.IsDelegateType (expr.Type)) {
Error (149, "Method name expected");
return null;
}
ArrayList args = new ArrayList (1);
args.Add (new Argument (argument, Argument.AType.Expression));
return new DelegateInvocation (expr, args, loc);
}
public override ExpressionStatement ResolveStatement (EmitContext ec)
{
Expression e = ResolveCore (ec);
if (e == null)
return null;
ExpressionStatement s = e as ExpressionStatement;
if (s == null) {
Error_InvalidExpressionStatement ();
return null;
}
return s.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);
}
}
*/
/// <summary>
/// Implements the new expression
/// </summary>
public class New : ExpressionStatement, IMemoryLocation {
protected Arguments Arguments;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
var c = Visitable.Container().Single("RequestedType", RequestedType);
if (Arguments != null){
c.ManyUntyped("Arguments", Arguments.args);
}
return c;
}
public override string GetNameX()
{
return null;
}
//
// During bootstrap, it contains the RequestedType,
// but if `type' is not null, it *might* contain a NewDelegate
// (because of field multi-initialization)
//
protected Expression RequestedType;
protected MethodGroupExpr method;
bool is_type_parameter;
public New (Expression requested_type, Arguments arguments, Location l)
{
RequestedType = requested_type;
Arguments = arguments;
loc = l;
}
/// <summary>
/// Converts complex core type syntax like 'new int ()' to simple constant
/// </summary>
public static Constant Constantify (Type t)
{
if (t == TypeManager.int32_type)
return new IntConstant (0, Location.Null);
if (t == TypeManager.uint32_type)
return new UIntConstant (0, Location.Null);
if (t == TypeManager.int64_type)
return new LongConstant (0, Location.Null);
if (t == TypeManager.uint64_type)
return new ULongConstant (0, Location.Null);
if (t == TypeManager.float_type)
return new FloatConstant (0, Location.Null);
if (t == TypeManager.double_type)
return new DoubleConstant (0, Location.Null);
if (t == TypeManager.short_type)
return new ShortConstant (0, Location.Null);
if (t == TypeManager.ushort_type)
return new UShortConstant (0, Location.Null);
if (t == TypeManager.sbyte_type)
return new SByteConstant (0, Location.Null);
if (t == TypeManager.byte_type)
return new ByteConstant (0, Location.Null);
if (t == TypeManager.char_type)
return new CharConstant ('\0', Location.Null);
if (t == TypeManager.bool_type)
return new BoolConstant (false, Location.Null);
if (t == TypeManager.decimal_type)
return new DecimalConstant (0, Location.Null);
if (TypeManager.IsEnumType (t))
return new EnumConstant (Constantify (TypeManager.GetEnumUnderlyingType (t)), t);
if (TypeManager.IsNullableType (t))
return Nullable.LiftedNull.Create (t, Location.Null);
return null;
}
//
// Checks whether the type is an interface that has the
// [ComImport, CoClass] attributes and must be treated
// specially
//
public Expression CheckComImport (ResolveContext 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 CreateExpressionTree (ResolveContext ec)
{
Arguments args;
if (method == null) {
args = new Arguments (1);
args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
} else {
args = Arguments.CreateForExpressionTree (ec,
Arguments,
method.CreateExpressionTree (ec));
}
return CreateExpressionFactoryCall (ec, "New", args);
}
public override Expression DoResolve (ResolveContext 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.IsPointer) {
ec.Report.Error (1919, loc, "Unsafe type `{0}' cannot be used in an object creation expression",
TypeManager.CSharpName (type));
return null;
}
if (Arguments == null) {
Constant c = Constantify (type);
if (c != null)
return ReducedExpression.Create (c, this);
}
if (TypeManager.IsDelegateType (type)) {
return (new NewDelegate (type, Arguments, loc)).Resolve (ec);
}
if (TypeManager.IsGenericParameter (type)) {
GenericConstraints gc = TypeManager.GetTypeParameterConstraints (type);
if ((gc == null) || (!gc.HasConstructorConstraint && !gc.IsValueType)) {
ec.Report.Error (304, loc,
"Cannot create an instance of the variable type '{0}' because it doesn't have the new() constraint",
TypeManager.CSharpName (type));
return null;
}
if ((Arguments != null) && (Arguments.Count != 0)) {
ec.Report.Error (417, loc,
"`{0}': cannot provide arguments when creating an instance of a variable type",
TypeManager.CSharpName (type));
return null;
}
if (TypeManager.activator_create_instance == null) {
Type activator_type = TypeManager.CoreLookupType (ec.Compiler, "System", "Activator", Kind.Class, true);
if (activator_type != null) {
TypeManager.activator_create_instance = TypeManager.GetPredefinedMethod (
activator_type, "CreateInstance", loc, Type.EmptyTypes);
}
}
is_type_parameter = true;
eclass = ExprClass.Value;
return this;
}
if (type.IsAbstract && type.IsSealed) {
ec.Report.SymbolRelatedToPreviousError (type);
ec.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;
}
ec.Report.SymbolRelatedToPreviousError (type);
ec.Report.Error (144, loc, "Cannot create an instance of the abstract class or interface `{0}'", TypeManager.CSharpName (type));
return null;
}
bool is_struct = TypeManager.IsStruct (type);
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, ConstructorInfo.ConstructorName,
MemberTypes.Constructor, AllBindingFlags | BindingFlags.DeclaredOnly, loc);
if (Arguments != null) {
bool dynamic;
Arguments.Resolve (ec, out dynamic);
if (dynamic) {
Arguments.Insert (0, new Argument (new TypeOf (texpr, loc).Resolve (ec)));
return new DynamicInvocation (new SimpleName (ConstructorInfo.ConstructorName, loc), Arguments, type, loc).Resolve (ec);
}
}
if (ml == null)
return null;
method = ml as MethodGroupExpr;
if (method == null) {
ml.Error_UnexpectedKind (ec, ResolveFlags.MethodGroup, 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_S, label_end);
ig.MarkLabel (label_activator);
ig.Emit (OpCodes.Call, ci);
ig.MarkLabel (label_end);
return true;
#else
throw new InternalErrorException ();
#endif
}
//
// This Emit 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)
//
// 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
//
// *** Implementation note ***
//
// To benefit from this optimization, each assignable expression
// has to manually cast to New and call this Emit.
//
// TODO: It's worth to implement it for arrays and fields
//
public virtual bool Emit (EmitContext ec, IMemoryLocation target)
{
bool is_value_type = TypeManager.IsValueType (type);
ILGenerator ig = ec.ig;
VariableReference vr = target as VariableReference;
if (target != null && is_value_type && (vr != null || method == null)) {
target.AddressOf (ec, AddressOp.Store);
} else if (vr != null && vr.IsRef) {
vr.EmitLoad (ec);
}
if (Arguments != null)
Arguments.Emit (ec);
if (is_value_type) {
if (method == null) {
ig.Emit (OpCodes.Initobj, type);
return false;
}
if (vr != null) {
ig.Emit (OpCodes.Call, (ConstructorInfo) method);
return false;
}
}
if (is_type_parameter)
return DoEmitTypeParameter (ec);
ConstructorInfo ci = (ConstructorInfo) method;
#if MS_COMPATIBLE
if (TypeManager.IsGenericType (type) && type.IsGenericTypeDefinition)
ci = TypeBuilder.GetConstructor (type, ci);
#endif
ig.Emit (OpCodes.Newobj, ci);
return true;
}
public override void Emit (EmitContext ec)
{
LocalTemporary v = null;
if (method == null && TypeManager.IsValueType (type)) {
// TODO: Use temporary variable from pool
v = new LocalTemporary (type);
}
if (!Emit (ec, v))
v.Emit (ec);
}
public override void EmitStatement (EmitContext ec)
{
LocalTemporary v = null;
if (method == null && TypeManager.IsValueType (type)) {
// TODO: Use temporary variable from pool
v = new LocalTemporary (type);
}
if (Emit (ec, v))
ec.ig.Emit (OpCodes.Pop);
}
public bool IsDefaultValueType {
get {
return TypeManager.IsValueType (type) && !HasInitializer && Arguments == null;
}
}
public virtual bool HasInitializer {
get {
return false;
}
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
EmitAddressOf (ec, mode);
}
protected virtual IMemoryLocation EmitAddressOf (EmitContext ec, AddressOp mode)
{
LocalTemporary value_target = new LocalTemporary (type);
if (is_type_parameter) {
DoEmitTypeParameter (ec);
value_target.Store (ec);
value_target.AddressOf (ec, mode);
return value_target;
}
if (!TypeManager.IsStruct (type)){
//
// 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");
}
value_target.AddressOf (ec, AddressOp.Store);
if (method == null) {
ec.ig.Emit (OpCodes.Initobj, type);
} else {
if (Arguments != null)
Arguments.Emit (ec);
ec.ig.Emit (OpCodes.Call, (ConstructorInfo) method);
}
value_target.AddressOf (ec, mode);
return value_target;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
New target = (New) t;
target.RequestedType = RequestedType.Clone (clonectx);
if (Arguments != null){
target.Arguments = Arguments.Clone (clonectx);
}
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
if (method != null) {
method.MutateHoistedGenericType (storey);
if (Arguments != null) {
Arguments.MutateHoistedGenericType (storey);
}
}
type = storey.MutateType (type);
}
}
/// <summary>
/// 14.5.10.2: Represents an array creation expression.
/// </summary>
///
/// <remarks>
/// There are two possible scenarios here: one is an array creation
/// expression that specifies the dimensions and optionally the
/// initialization data and the other which does not need dimensions
/// specified but where initialization data is mandatory.
/// </remarks>
public class ArrayCreation : Expression {
FullNamedExpression requested_base_type;
ArrayList initializers;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("requested_base_type", requested_base_type).ManyUntyped("initializers", initializers);
}
public override string GetNameX()
{
return null;
}
//
// 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 (FullNamedExpression 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 (exprs.Count);
foreach (Expression e in exprs) {
arguments.Add (e);
num_arguments++;
}
}
public ArrayCreation (FullNamedExpression 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;
}
protected override void Error_NegativeArrayIndex (ResolveContext ec, Location loc)
{
ec.Report.Error (248, loc, "Cannot create an array with a negative size");
}
bool CheckIndices (ResolveContext ec, ArrayList probe, int idx, bool specified_dims, int child_bounds)
{
if (specified_dims) {
Expression a = (Expression) arguments [idx];
a = a.Resolve (ec);
if (a == null)
return false;
Constant c = a as Constant;
if (c != null) {
c = c.ImplicitConversionRequired (ec, TypeManager.int32_type, a.Location);
}
if (c == null) {
ec.Report.Error (150, a.Location, "A constant value is expected");
return false;
}
int value = (int) c.GetValue ();
if (value != probe.Count) {
ec.Report.Error (847, loc, "An array initializer of length `{0}' was expected", value);
return false;
}
bounds [idx] = value;
}
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;
if (idx + 1 >= dimensions){
ec.Report.Error (623, loc, "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, child_bounds - 1);
if (!ret)
return false;
} else if (child_bounds > 1) {
ec.Report.Error (846, ((Expression) o).Location, "A nested array initializer was expected");
} else {
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 (ResolveContext ec)
{
Arguments args;
if (array_data == null) {
args = new Arguments (arguments.Count + 1);
args.Add (new Argument (new TypeOf (new TypeExpression (array_element_type, loc), loc)));
foreach (Expression a in arguments)
args.Add (new Argument (a.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall (ec, "NewArrayBounds", args);
}
if (dimensions > 1) {
ec.Report.Error (838, loc, "An expression tree cannot contain a multidimensional array initializer");
return null;
}
args = new Arguments (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) {
for (int i = 0; i < array_data.Count; ++i) {
Expression e = (Expression) array_data [i];
if (e == null)
e = Convert.ImplicitConversion (ec, (Expression) initializers [i], array_element_type, loc);
args.Add (new Argument (e.CreateExpressionTree (ec)));
}
}
return CreateExpressionFactoryCall (ec, "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 (e);
bounds [i++] = probe.Count;
probe = (ArrayList) probe [0];
} else {
Expression e = new IntConstant (probe.Count, Location.Null);
arguments.Add (e);
bounds [i++] = probe.Count;
return;
}
}
}
Expression first_emit;
LocalTemporary first_emit_temp;
protected virtual Expression ResolveArrayElement (ResolveContext ec, Expression element)
{
element = element.Resolve (ec);
if (element == null)
return null;
if (element is CompoundAssign.TargetExpression) {
if (first_emit != null)
throw new InternalErrorException ("Can only handle one mutator at a time");
first_emit = element;
element = first_emit_temp = new LocalTemporary (element.Type);
}
return Convert.ImplicitConversionRequired (
ec, element, array_element_type, loc);
}
protected bool ResolveInitializers (ResolveContext 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, dimensions);
arguments = new ArrayList ();
if (!CheckIndices (ec, initializers, 0, false, dimensions))
return false;
UpdateIndices ();
return true;
}
//
// Resolved the type of the array
//
bool ResolveArrayType (ResolveContext ec)
{
if (requested_base_type == null) {
ec.Report.Error (622, loc, "Can only use array initializer expressions to assign to array types. Try using a new expression instead");
return false;
}
if (requested_base_type is VarExpr) {
ec.Report.Error (820, loc, "An implicitly typed local variable declarator cannot use an array initializer");
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 (ResolveContext ec)
{
if (type != null)
return this;
if (!ResolveArrayType (ec))
return null;
//
// First step is to validate the initializers and fill
// in any missing bits
//
if (!ResolveInitializers (ec))
return null;
for (int i = 0; i < arguments.Count; ++i) {
Expression e = ((Expression) arguments[i]).Resolve (ec);
if (e == null)
continue;
arguments [i] = ConvertExpressionToArrayIndex (ec, e);
}
eclass = ExprClass.Value;
return this;
}
MethodInfo GetArrayMethod (int arguments)
{
ModuleBuilder mb = RootContext.ToplevelTypes.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) {
RootContext.ToplevelTypes.Compiler.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 (TypeManager.IsEnumType (array_element_type))
array_element_type = TypeManager.GetEnumUnderlyingType (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;
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
array_element_type = storey.MutateType (array_element_type);
type = storey.MutateType (type);
if (arguments != null) {
foreach (Expression e in arguments)
e.MutateHoistedGenericType (storey);
}
if (array_data != null) {
foreach (Expression e in array_data) {
// Don't mutate values optimized away
if (e == null)
continue;
e.MutateHoistedGenericType (storey);
}
}
}
//
// Emits the initializers for the array
//
void EmitStaticInitializers (EmitContext ec)
{
// FIXME: This should go to Resolve !
if (TypeManager.void_initializearray_array_fieldhandle == null) {
TypeManager.void_initializearray_array_fieldhandle = TypeManager.GetPredefinedMethod (
TypeManager.runtime_helpers_type, "InitializeArray", loc,
TypeManager.array_type, TypeManager.runtime_field_handle_type);
if (TypeManager.void_initializearray_array_fieldhandle == null)
return;
}
//
// 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 = RootContext.ToplevelTypes.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) && TypeManager.IsStruct (etype) &&
(!TypeManager.IsBuiltinOrEnum (etype) ||
etype == TypeManager.decimal_type)) {
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;
if (first_emit != null) {
first_emit.Emit (ec);
first_emit_temp.Store (ec);
}
foreach (Expression e in arguments)
e.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);
}
if (first_emit_temp != null)
first_emit_temp.Release (ec);
}
public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
if (arguments.Count != 1) {
// ec.Report.Error (-211, Location, "attribute can not encode multi-dimensional arrays");
return base.GetAttributableValue (ec, null, out value);
}
if (array_data == null) {
Expression arg = (Expression) arguments[0];
object arg_value;
if (arg.GetAttributableValue (ec, arg.Type, out arg_value) && arg_value is int && (int)arg_value == 0) {
value = Array.CreateInstance (array_element_type, 0);
return true;
}
// ec.Report.Error (-212, Location, "array should be initialized when passing it to an attribute");
return base.GetAttributableValue (ec, 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 (ec, 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 = (FullNamedExpression)requested_base_type.Clone (clonectx);
if (arguments != null){
target.arguments = new ArrayList (arguments.Count);
foreach (Expression e in arguments)
target.arguments.Add (e.Clone (clonectx));
}
if (initializers != null){
target.initializers = new ArrayList (initializers.Count);
foreach (object initializer in initializers)
if (initializer is ArrayList) {
ArrayList this_al = (ArrayList)initializer;
ArrayList al = new ArrayList (this_al.Count);
target.initializers.Add (al);
foreach (Expression e in this_al)
al.Add (e.Clone (clonectx));
} else {
target.initializers.Add (((Expression)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 (rank.Length > 2) {
while (rank [++dimensions] == ',');
} else {
dimensions = 1;
}
}
public override Expression DoResolve (ResolveContext 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 == InternalType.AnonymousMethod ||
array_element_type == InternalType.MethodGroup ||
arguments.Count != dimensions) {
Error_NoBestType (ec);
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;
}
void Error_NoBestType (ResolveContext ec)
{
ec.Report.Error (826, loc,
"The type of an implicitly typed array cannot be inferred from the initializer. Try specifying array type explicitly");
}
//
// Converts static initializer only
//
void UnifyInitializerElement (ResolveContext ec)
{
for (int i = 0; i < array_data.Count; ++i) {
Expression e = (Expression)array_data[i];
if (e != null)
array_data [i] = Convert.ImplicitConversion (ec, e, array_element_type, Location.Null);
}
}
protected override Expression ResolveArrayElement (ResolveContext ec, Expression element)
{
element = element.Resolve (ec);
if (element == null)
return null;
if (array_element_type == null) {
if (element.Type != TypeManager.null_type)
array_element_type = element.Type;
return element;
}
if (Convert.ImplicitConversionExists (ec, element, array_element_type)) {
return element;
}
if (Convert.ImplicitConversionExists (ec, new TypeExpression (array_element_type, loc), element.Type)) {
array_element_type = element.Type;
return element;
}
Error_NoBestType (ec);
return null;
}
}
public sealed class CompilerGeneratedThis : This
{
public static This Instance = new CompilerGeneratedThis ();
private CompilerGeneratedThis ()
: base (Location.Null)
{
}
public CompilerGeneratedThis (Type type, Location loc)
: base (loc)
{
this.type = type;
}
public override Expression DoResolve (ResolveContext ec)
{
eclass = ExprClass.Variable;
if (type == null)
type = ec.CurrentType;
is_struct = type.IsValueType;
return this;
}
public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
{
return null;
}
}
/// <summary>
/// Represents the `this' construct
/// </summary>
public class This : VariableReference
{
sealed class ThisVariable : ILocalVariable
{
public static readonly ILocalVariable Instance = new ThisVariable ();
public void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldarg_0);
}
public void EmitAssign (EmitContext ec)
{
throw new InvalidOperationException ();
}
public void EmitAddressOf (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldarg_0);
}
}
Block block;
VariableInfo variable_info;
protected bool is_struct;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("block", block);
}
public override string GetNameX()
{
return null;
}
public This (Block block, Location loc)
{
this.loc = loc;
this.block = block;
}
public This (Location loc)
{
this.loc = loc;
}
public override VariableInfo VariableInfo {
get { return variable_info; }
}
public override bool IsFixed {
get { return false; }
}
public override HoistedVariable GetHoistedVariable (AnonymousExpression ae)
{
if (ae == null)
return null;
AnonymousMethodStorey storey = ae.Storey;
while (storey != null) {
AnonymousMethodStorey temp = storey.Parent as AnonymousMethodStorey;
if (temp == null)
return storey.HoistedThis;
storey = temp;
}
return null;
}
public override bool IsRef {
get { return is_struct; }
}
protected override ILocalVariable Variable {
get { return ThisVariable.Instance; }
}
public static bool IsThisAvailable (ResolveContext ec)
{
if (ec.IsStatic || ec.HasAny (ResolveContext.Options.FieldInitializerScope | ResolveContext.Options.BaseInitializer | ResolveContext.Options.ConstantScope))
return false;
if (ec.CurrentAnonymousMethod == null)
return true;
if (ec.CurrentType.IsValueType && ec.CurrentIterator == null)
return false;
return true;
}
public bool ResolveBase (ResolveContext ec)
{
if (eclass != ExprClass.Invalid)
return true;
eclass = ExprClass.Variable;
type = ec.CurrentType;
if (!IsThisAvailable (ec)) {
if (ec.IsStatic && !ec.HasSet (ResolveContext.Options.ConstantScope)) {
ec.Report.Error (26, loc, "Keyword `this' is not valid in a static property, static method, or static field initializer");
} else if (ec.CurrentAnonymousMethod != null) {
ec.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");
} else {
ec.Report.Error (27, loc, "Keyword `this' is not available in the current context");
}
}
is_struct = type.IsValueType;
if (block != null) {
if (block.Toplevel.ThisVariable != null)
variable_info = block.Toplevel.ThisVariable.VariableInfo;
AnonymousExpression am = ec.CurrentAnonymousMethod;
if (am != null && ec.IsVariableCapturingRequired) {
am.SetHasThisAccess ();
}
}
return true;
}
//
// Called from Invocation to check if the invocation is correct
//
public override void CheckMarshalByRefAccess (ResolveContext ec)
{
if ((variable_info != null) && !(TypeManager.IsStruct (type) && ec.OmitStructFlowAnalysis) &&
!variable_info.IsAssigned (ec)) {
ec.Report.Error (188, loc,
"The `this' object cannot be used before all of its fields are assigned to");
variable_info.SetAssigned (ec);
}
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (1);
args.Add (new Argument (this));
// Use typeless constant for ldarg.0 to save some
// space and avoid problems with anonymous stories
return CreateExpressionFactoryCall (ec, "Constant", args);
}
public override Expression DoResolve (ResolveContext ec)
{
ResolveBase (ec);
return this;
}
override public Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
if (!ResolveBase (ec))
return null;
if (variable_info != null)
variable_info.SetAssigned (ec);
if (ec.CurrentType.IsClass){
if (right_side == EmptyExpression.UnaryAddress)
ec.Report.Error (459, loc, "Cannot take the address of `this' because it is read-only");
else if (right_side == EmptyExpression.OutAccess)
ec.Report.Error (1605, loc, "Cannot pass `this' as a ref or out argument because it is read-only");
else
ec.Report.Error (1604, loc, "Cannot assign to `this' because it is read-only");
}
return this;
}
public override int GetHashCode()
{
return block.GetHashCode ();
}
public override string Name {
get { return "this"; }
}
public override bool Equals (object obj)
{
This t = obj as This;
if (t == null)
return false;
return block == t.block;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
This target = (This) t;
target.block = clonectx.LookupBlock (block);
}
public override void SetHasAddressTaken ()
{
// Nothing
}
}
/// <summary>
/// Represents the `__arglist' construct
/// </summary>
public class ArglistAccess : Expression
{
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public ArglistAccess (Location loc)
{
this.loc = loc;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
eclass = ExprClass.Variable;
type = TypeManager.runtime_argument_handle_type;
if (ec.HasSet (ResolveContext.Options.FieldInitializerScope) || !ec.CurrentBlock.Toplevel.Parameters.HasArglist) {
ec.Report.Error (190, loc,
"The __arglist construct is valid only within a variable argument method");
}
return this;
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Arglist);
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
// nothing.
}
}
/// <summary>
/// Represents the `__arglist (....)' construct
/// </summary>
class Arglist : Expression
{
Arguments Arguments;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().ManyUntyped("Arguments", Arguments.args);
}
public override string GetNameX()
{
return null;
}
public Arglist (Location loc)
: this (null, loc)
{
}
public Arglist (Arguments args, Location l)
{
Arguments = args;
loc = l;
}
public Type[] ArgumentTypes {
get {
if (Arguments == null)
return Type.EmptyTypes;
Type[] retval = new Type [Arguments.Count];
for (int i = 0; i < retval.Length; i++)
retval [i] = Arguments [i].Expr.Type;
return retval;
}
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
ec.Report.Error (1952, loc, "An expression tree cannot contain a method with variable arguments");
return null;
}
public override Expression DoResolve (ResolveContext ec)
{
eclass = ExprClass.Variable;
type = InternalType.Arglist;
if (Arguments != null) {
bool dynamic; // Can be ignored as there is always only 1 overload
Arguments.Resolve (ec, out dynamic);
}
return this;
}
public override void Emit (EmitContext ec)
{
if (Arguments != null)
Arguments.Emit (ec);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
if (Arguments != null)
Arguments.MutateHoistedGenericType (storey);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
Arglist target = (Arglist) t;
if (Arguments != null)
target.Arguments = Arguments.Clone (clonectx);
}
}
/// <summary>
/// Implements the typeof operator
/// </summary>
public class TypeOf : Expression {
Expression QueriedType;
protected Type typearg;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("QueriedType", QueriedType);
}
public override string GetNameX()
{
return null;
}
public TypeOf (Expression queried_type, Location l)
{
QueriedType = queried_type;
loc = l;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (this));
args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
return CreateExpressionFactoryCall (ec, "Constant", args);
}
public override Expression DoResolve (ResolveContext ec)
{
if (eclass != ExprClass.Invalid)
return this;
TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
typearg = texpr.Type;
if (typearg == TypeManager.void_type) {
ec.Report.Error (673, loc, "System.Void cannot be used from C#. Use typeof (void) to get the void type object");
} else if (typearg.IsPointer && !ec.IsUnsafe){
UnsafeError (ec, loc);
} else if (texpr is DynamicTypeExpr) {
ec.Report.Error (1962, QueriedType.Location,
"The typeof operator cannot be used on the dynamic type");
}
type = TypeManager.type_type;
return DoResolveBase ();
}
protected Expression DoResolveBase ()
{
if (TypeManager.system_type_get_type_from_handle == null) {
TypeManager.system_type_get_type_from_handle = TypeManager.GetPredefinedMethod (
TypeManager.type_type, "GetTypeFromHandle", loc, TypeManager.runtime_handle_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, TypeManager.TypeToReflectionType (typearg));
ec.ig.Emit (OpCodes.Call, TypeManager.system_type_get_type_from_handle);
}
public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
if (TypeManager.ContainsGenericParameters (typearg) &&
!TypeManager.IsGenericTypeDefinition (typearg)) {
ec.Report.SymbolRelatedToPreviousError (typearg);
ec.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 override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
if (!TypeManager.IsGenericTypeDefinition (typearg))
typearg = storey.MutateType (typearg);
}
public Type TypeArgument {
get {
return typearg;
}
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
TypeOf target = (TypeOf) t;
if (QueriedType != null)
target.QueriedType = QueriedType.Clone (clonectx);
}
}
/// <summary>
/// Implements the `typeof (void)' operator
/// </summary>
public class TypeOfVoid : TypeOf {
public TypeOfVoid (Location l) : base (null, l)
{
loc = l;
}
public override Expression DoResolve (ResolveContext ec)
{
type = TypeManager.type_type;
typearg = TypeManager.void_type;
return DoResolveBase ();
}
}
class TypeOfMethod : TypeOfMember
{
public TypeOfMethod (MethodBase method, Location loc)
: base (method, loc)
{
}
public override Expression DoResolve (ResolveContext ec)
{
if (member is MethodInfo) {
type = TypeManager.methodinfo_type;
if (type == null)
type = TypeManager.methodinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", "MethodInfo", Kind.Class, true);
} else {
type = TypeManager.ctorinfo_type;
if (type == null)
type = TypeManager.ctorinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", "ConstructorInfo", Kind.Class, true);
}
return base.DoResolve (ec);
}
public override void Emit (EmitContext ec)
{
if (member is ConstructorInfo)
ec.ig.Emit (OpCodes.Ldtoken, (ConstructorInfo) member);
else
ec.ig.Emit (OpCodes.Ldtoken, (MethodInfo) member);
base.Emit (ec);
ec.ig.Emit (OpCodes.Castclass, type);
}
protected override string GetMethodName {
get { return "GetMethodFromHandle"; }
}
protected override string RuntimeHandleName {
get { return "RuntimeMethodHandle"; }
}
protected override MethodInfo TypeFromHandle {
get {
return TypeManager.methodbase_get_type_from_handle;
}
set {
TypeManager.methodbase_get_type_from_handle = value;
}
}
protected override MethodInfo TypeFromHandleGeneric {
get {
return TypeManager.methodbase_get_type_from_handle_generic;
}
set {
TypeManager.methodbase_get_type_from_handle_generic = value;
}
}
protected override string TypeName {
get { return "MethodBase"; }
}
}
abstract class TypeOfMember : Expression
{
protected readonly MemberInfo member;
protected TypeOfMember (MemberInfo member, Location loc)
{
this.member = member;
this.loc = loc;
}
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container(); //.Single("member", member);
}
public override string GetNameX()
{
return null;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (this));
args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
return CreateExpressionFactoryCall (ec, "Constant", args);
}
public override Expression DoResolve (ResolveContext ec)
{
bool is_generic = TypeManager.IsGenericType (member.DeclaringType);
MethodInfo mi = is_generic ? TypeFromHandleGeneric : TypeFromHandle;
if (mi == null) {
Type t = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", TypeName, Kind.Class, true);
Type handle_type = TypeManager.CoreLookupType (ec.Compiler, "System", RuntimeHandleName, Kind.Class, true);
if (t == null || handle_type == null)
return null;
mi = TypeManager.GetPredefinedMethod (t, GetMethodName, loc,
is_generic ?
new Type[] { handle_type, TypeManager.runtime_handle_type } :
new Type[] { handle_type } );
if (is_generic)
TypeFromHandleGeneric = mi;
else
TypeFromHandle = mi;
}
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
bool is_generic = TypeManager.IsGenericType (member.DeclaringType);
MethodInfo mi;
if (is_generic) {
mi = TypeFromHandleGeneric;
ec.ig.Emit (OpCodes.Ldtoken, member.DeclaringType);
} else {
mi = TypeFromHandle;
}
ec.ig.Emit (OpCodes.Call, mi);
}
protected abstract string GetMethodName { get; }
protected abstract string RuntimeHandleName { get; }
protected abstract MethodInfo TypeFromHandle { get; set; }
protected abstract MethodInfo TypeFromHandleGeneric { get; set; }
protected abstract string TypeName { get; }
}
class TypeOfField : TypeOfMember
{
public TypeOfField (FieldInfo field, Location loc)
: base (field, loc)
{
}
public override Expression DoResolve (ResolveContext ec)
{
if (TypeManager.fieldinfo_type == null)
TypeManager.fieldinfo_type = TypeManager.CoreLookupType (ec.Compiler, "System.Reflection", TypeName, Kind.Class, true);
type = TypeManager.fieldinfo_type;
return base.DoResolve (ec);
}
public override void Emit (EmitContext ec)
{
ec.ig.Emit (OpCodes.Ldtoken, (FieldInfo) member);
base.Emit (ec);
}
protected override string GetMethodName {
get { return "GetFieldFromHandle"; }
}
protected override string RuntimeHandleName {
get { return "RuntimeFieldHandle"; }
}
protected override MethodInfo TypeFromHandle {
get {
return TypeManager.fieldinfo_get_field_from_handle;
}
set {
TypeManager.fieldinfo_get_field_from_handle = value;
}
}
protected override MethodInfo TypeFromHandleGeneric {
get {
return TypeManager.fieldinfo_get_field_from_handle_generic;
}
set {
TypeManager.fieldinfo_get_field_from_handle_generic = value;
}
}
protected override string TypeName {
get { return "FieldInfo"; }
}
}
/// <summary>
/// Implements the sizeof expression
/// </summary>
public class SizeOf : Expression {
readonly Expression QueriedType;
Type type_queried;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("QueriedType", QueriedType);
}
public override string GetNameX()
{
return null;
}
public SizeOf (Expression queried_type, Location l)
{
this.QueriedType = queried_type;
loc = l;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Error_PointerInsideExpressionTree (ec);
return null;
}
public override Expression DoResolve (ResolveContext ec)
{
TypeExpr texpr = QueriedType.ResolveAsTypeTerminal (ec, false);
if (texpr == null)
return null;
type_queried = texpr.Type;
if (TypeManager.IsEnumType (type_queried))
type_queried = TypeManager.GetEnumUnderlyingType (type_queried);
int size_of = GetTypeSize (type_queried);
if (size_of > 0) {
return new IntConstant (size_of, loc);
}
if (!TypeManager.VerifyUnManaged (type_queried, loc)){
return null;
}
if (!ec.IsUnsafe) {
ec.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));
}
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)
{
}
}
/// <summary>
/// Implements the qualified-alias-member (::) expression.
/// </summary>
public class QualifiedAliasMember : MemberAccess
{
readonly string alias;
public static readonly string GlobalAlias = "global";
public QualifiedAliasMember (string alias, string identifier, TypeArguments targs, Location l)
: base (null, identifier, targs, l)
{
this.alias = alias;
}
public QualifiedAliasMember (string alias, string identifier, Location l)
: base (null, identifier, l)
{
this.alias = alias;
}
public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
{
if (alias == GlobalAlias) {
expr = GlobalRootNamespace.Instance;
return base.ResolveAsTypeStep (ec, silent);
}
int errors = ec.Compiler.Report.Errors;
expr = ec.LookupNamespaceAlias (alias);
if (expr == null) {
if (errors == ec.Compiler.Report.Errors)
ec.Compiler.Report.Error (432, loc, "Alias `{0}' not found", alias);
return null;
}
FullNamedExpression fne = base.ResolveAsTypeStep (ec, silent);
if (fne == null)
return null;
if (expr.eclass == ExprClass.Type) {
if (!silent) {
ec.Compiler.Report.Error (431, loc,
"Alias `{0}' cannot be used with '::' since it denotes a type. Consider replacing '::' with '.'", alias);
}
return null;
}
return fne;
}
public override Expression DoResolve (ResolveContext ec)
{
return ResolveAsTypeStep (ec, false);
}
protected override void Error_IdentifierNotFound (IMemberContext rc, FullNamedExpression expr_type, string identifier)
{
rc.Compiler.Report.Error (687, loc,
"A namespace alias qualifier `{0}' did not resolve to a namespace or a type",
GetSignatureForError ());
}
public override string GetSignatureForError ()
{
string name = Name;
if (targs != null) {
name = TypeManager.RemoveGenericArity (Name) + "<" +
targs.GetSignatureForError () + ">";
}
return alias + "::" + name;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
// Nothing
}
}
/// <summary>
/// Implements the member access expression
/// </summary>
public class MemberAccess : ATypeNameExpression {
protected Expression expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
//if (targs != null)
{
return Visitable.Container().Single("expr", expr)
.Base(base.GetChildrenX(context));
}
//return Visitable.Container();
}
public MemberAccess (Expression expr, string id)
: base (id, expr.Location)
{
this.expr = expr;
}
public MemberAccess (Expression expr, string identifier, Location loc)
: base (identifier, loc)
{
this.expr = expr;
}
public MemberAccess (Expression expr, string identifier, TypeArguments args, Location loc)
: base (identifier, args, loc)
{
this.expr = expr;
}
Expression DoResolve (ResolveContext 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;
string LookupIdentifier = MemberName.MakeName (Name, targs);
Namespace ns = expr_resolved as Namespace;
if (ns != null) {
FullNamedExpression retval = ns.Lookup (ec.Compiler, LookupIdentifier, loc);
if (retval == null)
ns.Error_NamespaceDoesNotExist (loc, LookupIdentifier, ec.Report);
else if (targs != null)
retval = new GenericTypeExpr (retval.Type, targs, loc).ResolveAsTypeStep (ec, false);
return retval;
}
Type expr_type = expr_resolved.Type;
if (TypeManager.IsDynamicType (expr_type)) {
Arguments args = new Arguments (2);
args.Add (new Argument (expr_resolved.Resolve (ec)));
if (right_side != null)
args.Add (new Argument (right_side));
return new DynamicMemberBinder (right_side != null, Name, args, loc).Resolve (ec);
}
if (expr_type.IsPointer || expr_type == TypeManager.void_type ||
expr_type == TypeManager.null_type || expr_type == InternalType.AnonymousMethod) {
Unary.Error_OperatorCannotBeApplied (ec, loc, ".", expr_type);
return null;
}
Constant c = expr_resolved as Constant;
if (c != null && c.GetValue () == null) {
ec.Report.Warning (1720, 1, loc, "Expression will always cause a `{0}'",
"System.NullReferenceException");
}
if (targs != null) {
if (!targs.Resolve (ec))
return null;
}
Expression member_lookup;
member_lookup = MemberLookup (ec.Compiler,
ec.CurrentType, expr_type, expr_type, Name, loc);
if (member_lookup == null && targs != null) {
member_lookup = MemberLookup (ec.Compiler,
ec.CurrentType, expr_type, expr_type, LookupIdentifier, loc);
}
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.LookupExtensionMethod (expr_type, Name, loc);
if (ex_method_lookup != null) {
ex_method_lookup.ExtensionExpression = expr_resolved;
if (targs != null) {
ex_method_lookup.SetTypeArguments (ec, targs);
}
return ex_method_lookup.DoResolve (ec);
}
}
expr = expr_resolved;
member_lookup = Error_MemberLookupFailed (ec,
ec.CurrentType, expr_type, expr_type, Name, null,
AllMemberTypes, AllBindingFlags);
if (member_lookup == null)
return null;
}
TypeExpr texpr = member_lookup as TypeExpr;
if (texpr != null) {
if (!(expr_resolved is TypeExpr) &&
(original == null || !original.IdenticalNameAndTypeName (ec, expr_resolved, loc))) {
ec.Report.Error (572, loc, "`{0}': cannot reference a type through an expression; try `{1}' instead",
Name, member_lookup.GetSignatureForError ());
return null;
}
if (!texpr.CheckAccessLevel (ec.MemberContext)) {
ec.Report.SymbolRelatedToPreviousError (member_lookup.Type);
ErrorIsInaccesible (loc, TypeManager.CSharpName (member_lookup.Type), ec.Report);
return null;
}
GenericTypeExpr ct = expr_resolved as GenericTypeExpr;
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.
//
TypeArguments nested_targs;
if (HasTypeArguments) {
nested_targs = ct.TypeArguments.Clone ();
nested_targs.Add (targs);
} else {
nested_targs = ct.TypeArguments;
}
ct = new GenericTypeExpr (member_lookup.Type, nested_targs, loc);
return ct.ResolveAsTypeStep (ec, false);
}
return member_lookup;
}
MemberExpr me = (MemberExpr) member_lookup;
me = me.ResolveMemberAccess (ec, expr_resolved, loc, original);
if (me == null)
return null;
if (targs != null) {
me.SetTypeArguments (ec, targs);
}
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 (ResolveContext ec)
{
return DoResolve (ec, null);
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
return DoResolve (ec, right_side);
}
public override FullNamedExpression ResolveAsTypeStep (IMemberContext ec, bool silent)
{
return ResolveNamespaceOrType (ec, silent);
}
public FullNamedExpression ResolveNamespaceOrType (IMemberContext rc, bool silent)
{
FullNamedExpression expr_resolved = expr.ResolveAsTypeStep (rc, silent);
if (expr_resolved == null)
return null;
string LookupIdentifier = MemberName.MakeName (Name, targs);
Namespace ns = expr_resolved as Namespace;
if (ns != null) {
FullNamedExpression retval = ns.Lookup (rc.Compiler, LookupIdentifier, loc);
if (retval == null && !silent)
ns.Error_NamespaceDoesNotExist (loc, LookupIdentifier, rc.Compiler.Report);
else if (targs != null)
retval = new GenericTypeExpr (retval.Type, targs, loc).ResolveAsTypeStep (rc, silent);
return retval;
}
TypeExpr tnew_expr = expr_resolved.ResolveAsTypeTerminal (rc, false);
if (tnew_expr == null)
return null;
Type expr_type = tnew_expr.Type;
if (TypeManager.IsGenericParameter (expr_type)) {
rc.Compiler.Report.Error (704, loc, "A nested type cannot be specified through a type parameter `{0}'",
tnew_expr.GetSignatureForError ());
return null;
}
Expression member_lookup = MemberLookup (rc.Compiler,
rc.CurrentType, expr_type, expr_type, LookupIdentifier,
MemberTypes.NestedType, BindingFlags.Public | BindingFlags.NonPublic, loc);
if (member_lookup == null) {
if (silent)
return null;
Error_IdentifierNotFound (rc, expr_resolved, LookupIdentifier);
return null;
}
TypeExpr texpr = member_lookup.ResolveAsTypeTerminal (rc, false);
if (texpr == null)
return null;
TypeArguments the_args = targs;
Type declaring_type = texpr.Type.DeclaringType;
if (TypeManager.HasGenericArguments (declaring_type) && !TypeManager.IsGenericTypeDefinition (expr_type)) {
while (!TypeManager.IsEqual (TypeManager.DropGenericTypeArguments (expr_type), declaring_type)) {
expr_type = expr_type.BaseType;
}
TypeArguments new_args = new TypeArguments ();
foreach (Type decl in TypeManager.GetTypeArguments (expr_type))
new_args.Add (new TypeExpression (TypeManager.TypeToCoreType (decl), loc));
if (targs != null)
new_args.Add (targs);
the_args = new_args;
}
if (the_args != null) {
GenericTypeExpr ctype = new GenericTypeExpr (texpr.Type, the_args, loc);
return ctype.ResolveAsTypeStep (rc, false);
}
return texpr;
}
protected virtual void Error_IdentifierNotFound (IMemberContext rc, FullNamedExpression expr_type, string identifier)
{
Expression member_lookup = MemberLookup (rc.Compiler,
rc.CurrentType, expr_type.Type, expr_type.Type, SimpleName.RemoveGenericArity (identifier),
MemberTypes.NestedType, BindingFlags.Public | BindingFlags.NonPublic, loc);
if (member_lookup != null) {
expr_type = member_lookup.ResolveAsTypeTerminal (rc, false);
if (expr_type == null)
return;
Namespace.Error_TypeArgumentsCannotBeUsed (expr_type, loc);
return;
}
member_lookup = MemberLookup (rc.Compiler,
rc.CurrentType, expr_type.Type, expr_type.Type, identifier,
MemberTypes.All, BindingFlags.Public | BindingFlags.NonPublic, loc);
if (member_lookup == null) {
rc.Compiler.Report.Error (426, loc, "The nested type `{0}' does not exist in the type `{1}'",
Name, expr_type.GetSignatureForError ());
} else {
// TODO: Report.SymbolRelatedToPreviousError
member_lookup.Error_UnexpectedKind (rc.Compiler.Report, null, "type", loc);
}
}
protected override void Error_TypeDoesNotContainDefinition (ResolveContext ec, Type type, string name)
{
if (RootContext.Version > LanguageVersion.ISO_2 &&
((expr.eclass & (ExprClass.Value | ExprClass.Variable)) != 0)) {
ec.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 (ec, type, name);
}
public override string GetSignatureForError ()
{
return expr.GetSignatureForError () + "." + base.GetSignatureForError ();
}
public Expression Left {
get {
return expr;
}
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
MemberAccess target = (MemberAccess) t;
target.expr = expr.Clone (clonectx);
}
}
/// <summary>
/// Implements checked expressions
/// </summary>
public class CheckedExpr : Expression {
public Expression Expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("Expr", Expr);
}
public override string GetNameX()
{
return null;
}
public CheckedExpr (Expression e, Location l)
{
Expr = e;
loc = l;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
using (ec.With (ResolveContext.Options.AllCheckStateFlags, true))
return Expr.CreateExpressionTree (ec);
}
public override Expression DoResolve (ResolveContext ec)
{
using (ec.With (ResolveContext.Options.AllCheckStateFlags, true))
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
if (Expr is Constant || Expr is MethodGroupExpr || Expr is AnonymousMethodExpression || Expr is DefaultValueExpression)
return Expr;
eclass = Expr.eclass;
type = Expr.Type;
return this;
}
public override void Emit (EmitContext ec)
{
using (ec.With (EmitContext.Options.AllCheckStateFlags, true))
Expr.Emit (ec);
}
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
using (ec.With (EmitContext.Options.AllCheckStateFlags, true))
Expr.EmitBranchable (ec, target, on_true);
}
#if NET_4_0
public override SLE.Expression MakeExpression (BuilderContext ctx)
{
using (ctx.With (BuilderContext.Options.AllCheckStateFlags, true)) {
return Expr.MakeExpression (ctx);
}
}
#endif
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
Expr.MutateHoistedGenericType (storey);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
CheckedExpr target = (CheckedExpr) t;
target.Expr = Expr.Clone (clonectx);
}
}
/// <summary>
/// Implements the unchecked expression
/// </summary>
public class UnCheckedExpr : Expression {
public Expression Expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("Expr", Expr);
}
public override string GetNameX()
{
return null;
}
public UnCheckedExpr (Expression e, Location l)
{
Expr = e;
loc = l;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
using (ec.With (ResolveContext.Options.AllCheckStateFlags, false))
return Expr.CreateExpressionTree (ec);
}
public override Expression DoResolve (ResolveContext ec)
{
using (ec.With (ResolveContext.Options.AllCheckStateFlags, false))
Expr = Expr.Resolve (ec);
if (Expr == null)
return null;
if (Expr is Constant || Expr is MethodGroupExpr || Expr is AnonymousMethodExpression || Expr is DefaultValueExpression)
return Expr;
eclass = Expr.eclass;
type = Expr.Type;
return this;
}
public override void Emit (EmitContext ec)
{
using (ec.With (EmitContext.Options.AllCheckStateFlags, false))
Expr.Emit (ec);
}
public override void EmitBranchable (EmitContext ec, Label target, bool on_true)
{
using (ec.With (EmitContext.Options.AllCheckStateFlags, false))
Expr.EmitBranchable (ec, target, on_true);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
Expr.MutateHoistedGenericType (storey);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
UnCheckedExpr target = (UnCheckedExpr) t;
target.Expr = Expr.Clone (clonectx);
}
}
/// <summary>
/// An Element Access expression.
///
/// During semantic analysis these are transformed into
/// IndexerAccess, ArrayAccess or a PointerArithmetic.
/// </summary>
public class ElementAccess : Expression {
public Arguments Arguments;
public Expression Expr;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("Expr", Expr).ManyUntyped("Arguments", Arguments.args);
}
public override string GetNameX()
{
return null;
}
public ElementAccess (Expression e, Arguments args)
{
Expr = e;
loc = e.Location;
this.Arguments = args;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = Arguments.CreateForExpressionTree (ec, Arguments,
Expr.CreateExpressionTree (ec));
return CreateExpressionFactoryCall (ec, "ArrayIndex", args);
}
Expression MakePointerAccess (ResolveContext ec, Type t)
{
if (Arguments.Count != 1){
ec.Report.Error (196, loc, "A pointer must be indexed by only one value");
return null;
}
if (Arguments [0] is NamedArgument)
Error_NamedArgument ((NamedArgument) Arguments[0], ec.Report);
Expression p = new PointerArithmetic (Binary.Operator.Addition, Expr, Arguments [0].Expr.Resolve (ec), t, loc);
return new Indirection (p, loc).Resolve (ec);
}
public override Expression DoResolve (ResolveContext ec)
{
Expr = Expr.Resolve (ec);
if (Expr == null)
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){
ec.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 (ResolveContext ec, Expression right_side)
{
Expr = Expr.Resolve (ec);
if (Expr == null)
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 && TypeManager.IsStruct (type))
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 static void Error_NamedArgument (NamedArgument na, Report Report)
{
Report.Error (1742, na.Name.Location, "An element access expression cannot use named argument");
}
public override string GetSignatureForError ()
{
return Expr.GetSignatureForError ();
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
ElementAccess target = (ElementAccess) t;
target.Expr = Expr.Clone (clonectx);
if (Arguments != null)
target.Arguments = Arguments.Clone (clonectx);
}
}
/// <summary>
/// Implements array access
/// </summary>
public class ArrayAccess : Expression, IAssignMethod, IMemoryLocation {
//
// Points to our "data" repository
//
ElementAccess ea;
LocalTemporary temp;
bool prepared;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("ea", ea);
}
public override string GetNameX()
{
return null;
}
public ArrayAccess (ElementAccess ea_data, Location l)
{
ea = ea_data;
loc = l;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return ea.CreateExpressionTree (ec);
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
return DoResolve (ec);
}
public override Expression DoResolve (ResolveContext 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
if (eclass != ExprClass.Invalid)
return this;
// dynamic is used per argument in ConvertExpressionToArrayIndex case
bool dynamic;
ea.Arguments.Resolve (ec, out dynamic);
Type t = ea.Expr.Type;
int rank = ea.Arguments.Count;
if (t.GetArrayRank () != rank) {
ec.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.IsUnsafe) {
UnsafeError (ec, ea.Location);
}
foreach (Argument a in ea.Arguments) {
if (a is NamedArgument)
ElementAccess.Error_NamedArgument ((NamedArgument) a, ec.Report);
a.Expr = ConvertExpressionToArrayIndex (ec, a.Expr);
}
eclass = ExprClass.Variable;
return this;
}
/// <summary>
/// Emits the right opcode to load an object of Type `t'
/// from an array of T
/// </summary>
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.GetEnumUnderlyingType (type), rank);
} else if (TypeManager.IsStruct (type)){
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 (ResolveContext ec, Location loc)
{
ec.Report.Warning (251, 2, loc, "Indexing an array with a negative index (array indices always start at zero)");
}
/// <summary>
/// Returns the right opcode to store an object of Type `t'
/// from an array of T.
/// </summary>
static public OpCode GetStoreOpcode (Type t, out bool is_stobj, out bool has_type_arg)
{
has_type_arg = false; is_stobj = false;
t = TypeManager.TypeToCoreType (t);
if (TypeManager.IsEnumType (t))
t = TypeManager.GetEnumUnderlyingType (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 (TypeManager.IsStruct (t)) {
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 = RootContext.ToplevelTypes.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 = RootContext.ToplevelTypes.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.
//
void LoadArrayAndArguments (EmitContext ec)
{
ea.Expr.Emit (ec);
for (int i = 0; i < ea.Arguments.Count; ++i) {
ea.Arguments [i].Emit (ec);
}
}
public void Emit (EmitContext ec, bool leave_copy)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
if (prepared) {
LoadFromPtr (ig, this.type);
} else {
LoadArrayAndArguments (ec);
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;
if (prepared) {
AddressOf (ec, AddressOp.LoadStore);
ec.ig.Emit (OpCodes.Dup);
} else {
LoadArrayAndArguments (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 = RootContext.ToplevelTypes.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 EmitNew (EmitContext ec, New source, bool leave_copy)
{
if (!source.Emit (ec, this)) {
if (leave_copy)
throw new NotImplementedException ();
return;
}
throw new NotImplementedException ();
}
public void AddressOf (EmitContext ec, AddressOp mode)
{
int rank = ea.Expr.Type.GetArrayRank ();
ILGenerator ig = ec.ig;
LoadArrayAndArguments (ec);
if (rank == 1){
ig.Emit (OpCodes.Ldelema, type);
} else {
MethodInfo address = FetchAddressMethod ();
ig.Emit (OpCodes.Call, address);
}
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
type = storey.MutateType (type);
ea.Expr.Type = storey.MutateType (ea.Expr.Type);
}
}
/// <summary>
/// Expressions that represent an indexer call.
/// </summary>
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, AParametersCollection 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 (TypeManager.IsGenericParameter (lookup_type)) {
GenericConstraints gc = TypeManager.GetTypeParameterConstraints (lookup_type);
if (gc == null)
return ix;
if (gc.HasClassConstraint) {
Type class_contraint = gc.ClassConstraint;
while (class_contraint != TypeManager.object_type && class_contraint != null) {
ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, class_contraint));
class_contraint = class_contraint.BaseType;
}
}
Type[] ifaces = gc.InterfaceConstraints;
foreach (Type itype in ifaces)
ix.Append (caller_type, GetIndexersForTypeOrInterface (caller_type, itype));
return ix;
}
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;
}
}
//
// 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 Arguments arguments;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("instance_expr", instance_expr);
}
public override string GetNameX()
{
return null;
}
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 (bool isSet)
{
return isSet ? "set" : "get";
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = Arguments.CreateForExpressionTree (ec, arguments,
instance_expr.CreateExpressionTree (ec),
new TypeOfMethod (get, loc));
return CreateExpressionFactoryCall (ec, "Call", args);
}
protected virtual void CommonResolve (ResolveContext ec)
{
indexer_type = instance_expr.Type;
current_type = ec.CurrentType;
}
public override Expression DoResolve (ResolveContext ec)
{
return ResolveAccessor (ec, null);
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
if (right_side == EmptyExpression.OutAccess) {
ec.Report.Error (206, loc,
"A property or indexer may not be passed as an out or ref parameter");
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);
}
return ResolveAccessor (ec, right_side);
}
Expression ResolveAccessor (ResolveContext ec, Expression right_side)
{
CommonResolve (ec);
bool dynamic;
arguments.Resolve (ec, out dynamic);
if (dynamic || TypeManager.IsDynamicType (indexer_type)) {
int additional = right_side == null ? 1 : 2;
Arguments args = new Arguments (arguments.Count + additional);
if (is_base_indexer) {
ec.Report.Error (1972, loc, "The indexer base access cannot be dynamically dispatched. Consider casting the dynamic arguments or eliminating the base access");
} else {
args.Add (new Argument (instance_expr));
}
args.AddRange (arguments);
if (right_side != null)
args.Add (new Argument (right_side));
return new DynamicIndexBinder (right_side != null, args, loc).Resolve (ec);
}
Indexers ilist = Indexers.GetIndexersForType (current_type, indexer_type);
if (ilist.Methods == null) {
ec.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 = TypeManager.TypeToCoreType (pi.PropertyType);
if (type.IsPointer && !ec.IsUnsafe)
UnsafeError (ec, loc);
MethodInfo accessor;
if (right_side == null) {
accessor = get = pi.GetGetMethod (true);
} else {
accessor = set = pi.GetSetMethod (true);
if (accessor == null && pi.GetGetMethod (true) != null) {
ec.Report.SymbolRelatedToPreviousError (pi);
ec.Report.Error (200, loc, "The read only property or indexer `{0}' cannot be assigned to",
TypeManager.GetFullNameSignature (pi));
return null;
}
set_expr = Convert.ImplicitConversion (ec, right_side, type, loc);
}
if (accessor == null) {
ec.Report.SymbolRelatedToPreviousError (pi);
ec.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 (right_side != null));
return null;
}
//
// Only base will allow this invocation to happen.
//
if (accessor.IsAbstract && this is BaseIndexerAccess) {
Error_CannotCallAbstractBase (ec, TypeManager.GetFullNameSignature (pi));
}
bool must_do_cs1540_check;
if (!IsAccessorAccessible (ec.CurrentType, 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)) {
ec.Report.SymbolRelatedToPreviousError (accessor);
ec.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 (right_side != null));
} else {
ec.Report.SymbolRelatedToPreviousError (pi);
ErrorIsInaccesible (loc, TypeManager.GetFullNameSignature (pi), ec.Report);
}
}
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;
}
if (!prepared)
arguments.Add (new Argument (value));
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);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
if (get != null)
get = storey.MutateGenericMethod (get);
if (set != null)
set = storey.MutateGenericMethod (set);
instance_expr.MutateHoistedGenericType (storey);
if (arguments != null)
arguments.MutateHoistedGenericType (storey);
type = storey.MutateType (type);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
IndexerAccess target = (IndexerAccess) t;
if (arguments != null)
target.arguments = arguments.Clone (clonectx);
if (instance_expr != null)
target.instance_expr = instance_expr.Clone (clonectx);
}
}
/// <summary>
/// The base operator for method names
/// </summary>
public class BaseAccess : Expression {
public readonly string Identifier;
TypeArguments args;
public BaseAccess (string member, Location l)
{
this.Identifier = member;
loc = l;
}
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
public BaseAccess (string member, TypeArguments args, Location l)
: this (member, l)
{
this.args = args;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext 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 (ResolveContext 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 (ResolveContext ec)
{
Expression member_lookup;
Type current_type = ec.CurrentType;
Type base_type = current_type.BaseType;
if (!This.IsThisAvailable (ec)) {
if (ec.IsStatic) {
ec.Report.Error (1511, loc, "Keyword `base' is not available in a static method");
} else {
ec.Report.Error (1512, loc, "Keyword `base' is not available in the current context");
}
return null;
}
member_lookup = MemberLookup (ec.Compiler, ec.CurrentType, null, base_type, Identifier,
AllMemberTypes, AllBindingFlags, loc);
if (member_lookup == null) {
Error_MemberLookupFailed (ec, ec.CurrentType, 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 = member_lookup as MemberExpr;
if (me == null){
if (member_lookup is TypeExpression){
ec.Report.Error (582, loc, "{0}: Can not reference a type through an expression, try `{1}' instead",
Identifier, member_lookup.GetSignatureForError ());
} else {
ec.Report.Error (582, loc, "{0}: Can not reference a {1} through an expression",
Identifier, member_lookup.ExprClassName);
}
return null;
}
me = me.ResolveMemberAccess (ec, left, loc, null);
if (me == null)
return null;
me.IsBase = true;
if (args != null) {
args.Resolve (ec);
me.SetTypeArguments (ec, 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 ();
}
}
/// <summary>
/// The base indexer operator
/// </summary>
public class BaseIndexerAccess : IndexerAccess {
public BaseIndexerAccess (Arguments args, Location loc)
: base (null, true, loc)
{
this.arguments = args;
}
protected override void CommonResolve (ResolveContext ec)
{
instance_expr = ec.GetThis (loc);
current_type = ec.CurrentType.BaseType;
indexer_type = current_type;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
MemberExpr.Error_BaseAccessInExpressionTree (ec, loc);
return base.CreateExpressionTree (ec);
}
}
/// <summary>
/// This class exists solely to pass the Type around and to be a dummy
/// that can be passed to the conversion functions (this is used by
/// foreach implementation to typecast the object return value from
/// get_Current into the proper type. All code has been generated and
/// we only care about the side effect conversions to be performed
///
/// This is also now used as a placeholder where a no-action expression
/// is needed (the `New' class).
/// </summary>
public class EmptyExpression : Expression {
public static readonly Expression Null = new EmptyExpression ();
public static readonly EmptyExpression OutAccess = new EmptyExpression ();
public static readonly EmptyExpression LValueMemberAccess = new EmptyExpression ();
public static readonly EmptyExpression LValueMemberOutAccess = new EmptyExpression ();
public static readonly EmptyExpression UnaryAddress = 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;
}
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
EmptyExpression ()
{
// FIXME: Don't set to object
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 CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
return this;
}
public override void Emit (EmitContext ec)
{
// nothing, as we only exist to not do anything.
}
public override void EmitSideEffect (EmitContext ec)
{
}
//
// 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 ();
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container();
}
public override string GetNameX()
{
return null;
}
private EmptyExpressionStatement ()
{
eclass = ExprClass.Value;
loc = Location.Null;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
return null;
}
public override void EmitStatement (EmitContext ec)
{
// Do nothing
}
public override Expression DoResolve (ResolveContext ec)
{
type = TypeManager.object_type;
return this;
}
public override void Emit (EmitContext ec)
{
// Do nothing
}
}
public class UserCast : Expression {
MethodInfo method;
Expression source;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("source", source)
.String("method", method.ToString());
}
public override string GetNameX()
{
return null;
}
public UserCast (MethodInfo method, Expression source, Location l)
{
this.method = method;
this.source = source;
type = TypeManager.TypeToCoreType (method.ReturnType);
loc = l;
}
public Expression Source {
get {
return source;
}
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (3);
args.Add (new Argument (source.CreateExpressionTree (ec)));
args.Add (new Argument (new TypeOf (new TypeExpression (type, loc), loc)));
args.Add (new Argument (new TypeOfMethod (method, loc)));
return CreateExpressionFactoryCall (ec, "Convert", args);
}
public override Expression DoResolve (ResolveContext ec)
{
ObsoleteAttribute oa = AttributeTester.GetMethodObsoleteAttribute (method);
if (oa != null)
AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc, ec.Report);
eclass = ExprClass.Value;
return this;
}
public override void Emit (EmitContext ec)
{
source.Emit (ec);
ec.ig.Emit (OpCodes.Call, method);
}
public override string GetSignatureForError ()
{
return TypeManager.CSharpSignature (method);
}
#if NET_4_0
public override SLE.Expression MakeExpression (BuilderContext ctx)
{
return SLE.Expression.Convert (source.MakeExpression (ctx), type, method);
}
#endif
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
source.MutateHoistedGenericType (storey);
method = storey.MutateGenericMethod (method);
}
}
// <summary>
// This class is used to "construct" the type during a typecast
// operation. Since the Type.GetType class in .NET can parse
// the type specification, we just use this to construct the type
// one bit at a time.
// </summary>
public class ComposedCast : TypeExpr {
FullNamedExpression left;
string dim;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("left", left);
}
public override string GetNameX()
{
return null;
}
public ComposedCast (FullNamedExpression left, string dim)
: this (left, dim, left.Location)
{
}
public ComposedCast (FullNamedExpression left, string dim, Location l)
{
this.left = left;
this.dim = dim;
loc = l;
}
protected override TypeExpr DoResolveAsTypeStep (IMemberContext ec)
{
TypeExpr lexpr = left.ResolveAsTypeTerminal (ec, false);
if (lexpr == null)
return null;
Type ltype = lexpr.Type;
if ((dim.Length > 0) && (dim [0] == '?')) {
TypeExpr nullable = new Nullable.NullableType (lexpr, loc);
if (dim.Length > 1)
nullable = new ComposedCast (nullable, dim.Substring (1), loc);
return nullable.ResolveAsTypeTerminal (ec, false);
}
if (dim == "*" && !TypeManager.VerifyUnManaged (ltype, loc))
return null;
if (dim.Length != 0 && dim [0] == '[') {
if (TypeManager.IsSpecialType (ltype)) {
ec.Compiler.Report.Error (611, loc, "Array elements cannot be of type `{0}'", TypeManager.CSharpName (ltype));
return null;
}
if ((ltype.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
ec.Compiler.Report.SymbolRelatedToPreviousError (ltype);
ec.Compiler.Report.Error (719, loc, "Array elements cannot be of static type `{0}'",
TypeManager.CSharpName (ltype));
}
}
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.IsUnsafe){
UnsafeError (ec.Compiler.Report, loc);
}
eclass = ExprClass.Type;
return this;
}
public override string GetSignatureForError ()
{
return left.GetSignatureForError () + dim;
}
public override TypeExpr ResolveAsTypeTerminal (IMemberContext ec, bool silent)
{
return ResolveAsBaseTerminal (ec, silent);
}
}
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 IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("array", array);
}
public override string GetNameX()
{
return null;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Error_PointerInsideExpressionTree (ec);
return null;
}
public override void Emit(EmitContext ec)
{
array.Emit (ec);
}
public override Expression DoResolve (ResolveContext 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 : TypeCast
{
public ArrayIndexCast (Expression expr)
: base (expr, expr.Type)
{
if (type == TypeManager.int32_type)
throw new ArgumentException ("unnecessary conversion");
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (child.CreateExpressionTree (ec)));
args.Add (new Argument (new TypeOf (new TypeExpression (TypeManager.int32_type, loc), loc)));
return CreateExpressionFactoryCall (ec, "ConvertChecked", args);
}
public override void Emit (EmitContext ec)
{
child.Emit (ec);
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);
}
public override bool GetAttributableValue (ResolveContext ec, Type value_type, out object value)
{
return child.GetAttributableValue (ec, value_type, out value);
}
}
//
// Implements the `stackalloc' keyword
//
public class StackAlloc : Expression {
Type otype;
Expression t;
Expression count;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("t", t).Single("count", count);
}
public override string GetNameX()
{
return null;
}
public StackAlloc (Expression type, Expression count, Location l)
{
t = type;
this.count = count;
loc = l;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
count = count.Resolve (ec);
if (count == null)
return null;
if (count.Type != TypeManager.uint32_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) {
ec.Report.Error (247, loc, "Cannot use a negative size with stackalloc");
return null;
}
if (ec.HasAny (ResolveContext.Options.CatchScope | ResolveContext.Options.FinallyScope)) {
ec.Report.Error (255, loc, "Cannot use stackalloc in finally or catch");
}
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;
count.Emit (ec);
if (size == 0)
ig.Emit (OpCodes.Sizeof, otype);
else
IntConstant.EmitInt (ig, size);
ig.Emit (OpCodes.Mul_Ovf_Un);
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 : Assign
{
public readonly string Name;
public ElementInitializer (string name, Expression initializer, Location loc)
: base (null, initializer, loc)
{
this.Name = name;
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
ElementInitializer target = (ElementInitializer) t;
target.source = source.Clone (clonectx);
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
FieldExpr fe = target as FieldExpr;
if (fe != null)
args.Add (new Argument (fe.CreateTypeOfExpression ()));
else
args.Add (new Argument (((PropertyExpr)target).CreateSetterTypeOfExpression ()));
args.Add (new Argument (source.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall (ec,
source is CollectionOrObjectInitializers ? "ListBind" : "Bind",
args);
}
public override Expression DoResolve (ResolveContext ec)
{
if (source == null)
return EmptyExpressionStatement.Instance;
MemberExpr me = MemberLookupFinal (ec, ec.CurrentInitializerVariable.Type, ec.CurrentInitializerVariable.Type,
Name, MemberTypes.Field | MemberTypes.Property, BindingFlags.Public | BindingFlags.Instance, loc) as MemberExpr;
if (me == null)
return null;
target = me;
me.InstanceExpression = ec.CurrentInitializerVariable;
if (source is CollectionOrObjectInitializers) {
Expression previous = ec.CurrentInitializerVariable;
ec.CurrentInitializerVariable = target;
source = source.Resolve (ec);
ec.CurrentInitializerVariable = previous;
if (source == null)
return null;
eclass = source.eclass;
type = source.Type;
return this;
}
Expression expr = base.DoResolve (ec);
if (expr == null)
return null;
//
// Ignore field initializers with default value
//
Constant c = source as Constant;
if (c != null && c.IsDefaultInitializer (type) && target.eclass == ExprClass.Variable)
return EmptyExpressionStatement.Instance.DoResolve (ec);
return expr;
}
protected override Expression Error_MemberLookupFailed (ResolveContext ec, Type type, MemberInfo[] members)
{
MemberInfo member = members [0];
if (member.MemberType != MemberTypes.Property && member.MemberType != MemberTypes.Field)
ec.Report.Error (1913, loc, "Member `{0}' cannot be initialized. An object " +
"initializer may only be used for fields, or properties", TypeManager.GetFullNameSignature (member));
else
ec.Report.Error (1914, loc, " Static field or property `{0}' cannot be assigned in an object initializer",
TypeManager.GetFullNameSignature (member));
return null;
}
public override void EmitStatement (EmitContext ec)
{
if (source is CollectionOrObjectInitializers)
source.Emit (ec);
else
base.EmitStatement (ec);
}
}
//
// A collection initializer expression
//
class CollectionElementInitializer : Invocation
{
public class ElementInitializerArgument : Argument
{
public ElementInitializerArgument (Expression e)
: base (e)
{
}
}
sealed class AddMemberAccess : MemberAccess
{
public AddMemberAccess (Expression expr, Location loc)
: base (expr, "Add", loc)
{
}
protected override void Error_TypeDoesNotContainDefinition (ResolveContext ec, Type type, string name)
{
if (TypeManager.HasElementType (type))
return;
base.Error_TypeDoesNotContainDefinition (ec, type, name);
}
}
public CollectionElementInitializer (Expression argument)
: base (null, new Arguments (1))
{
base.arguments.Add (new ElementInitializerArgument (argument));
this.loc = argument.Location;
}
public CollectionElementInitializer (ArrayList arguments, Location loc)
: base (null, new Arguments (arguments.Count))
{
foreach (Expression e in arguments)
base.arguments.Add (new ElementInitializerArgument (e));
this.loc = loc;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (mg.CreateExpressionTree (ec)));
ArrayList expr_initializers = new ArrayList (arguments.Count);
foreach (Argument a in arguments)
expr_initializers.Add (a.CreateExpressionTree (ec));
args.Add (new Argument (new ArrayCreation (
CreateExpressionTypeExpression (ec, loc), "[]", expr_initializers, loc)));
return CreateExpressionFactoryCall (ec, "ElementInit", args);
}
protected override void CloneTo (CloneContext clonectx, Expression t)
{
CollectionElementInitializer target = (CollectionElementInitializer) t;
if (arguments != null)
target.arguments = arguments.Clone (clonectx);
}
public override Expression DoResolve (ResolveContext ec)
{
if (eclass != ExprClass.Invalid)
return this;
base.expr = new AddMemberAccess (ec.CurrentInitializerVariable, loc);
return base.DoResolve (ec);
}
}
//
// A block of object or collection initializers
//
public class CollectionOrObjectInitializers : ExpressionStatement
{
ArrayList initializers;
bool is_collection_initialization;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().ManyUntyped("initializers", initializers);
}
public override string GetNameX()
{
return null;
}
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;
}
}
public bool IsCollectionInitializer {
get {
return is_collection_initialization;
}
}
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 CreateExpressionTree (ResolveContext ec)
{
ArrayList expr_initializers = new ArrayList (initializers.Count);
foreach (Expression e in initializers) {
Expression expr = e.CreateExpressionTree (ec);
if (expr != null)
expr_initializers.Add (expr);
}
return new ImplicitlyTypedArrayCreation ("[]", expr_initializers, loc);
}
public override Expression DoResolve (ResolveContext ec)
{
if (eclass != ExprClass.Invalid)
return this;
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) {
element_names = new ArrayList (initializers.Count);
element_names.Add (element_initializer.Name);
} else if (initializer is CompletingExpression){
initializer.Resolve (ec);
throw new InternalErrorException ("This line should never be reached");
} else {
if (!TypeManager.ImplementsInterface (ec.CurrentInitializerVariable.Type, TypeManager.ienumerable_type)) {
ec.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;
}
is_collection_initialization = true;
}
} else {
if (is_collection_initialization != (element_initializer == null)) {
ec.Report.Error (747, initializer.Location, "Inconsistent `{0}' member declaration",
is_collection_initialization ? "collection initializer" : "object initializer");
continue;
}
if (!is_collection_initialization) {
if (element_names.Contains (element_initializer.Name)) {
ec.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 = ec.CurrentInitializerVariable.Type;
if (is_collection_initialization) {
if (TypeManager.HasElementType (type)) {
ec.Report.Error (1925, loc, "Cannot initialize object of type `{0}' with a collection initializer",
TypeManager.CSharpName (type));
}
}
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);
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
foreach (Expression e in initializers)
e.MutateHoistedGenericType (storey);
}
}
//
// 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 override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("new_instance", new_instance);
}
public override string GetNameX()
{
return null;
}
public InitializerTargetExpression (NewInitialize newInstance)
{
this.type = newInstance.type;
this.loc = newInstance.loc;
this.eclass = newInstance.eclass;
this.new_instance = newInstance;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
// Should not be reached
throw new NotSupportedException ("ET");
}
public override Expression DoResolve (ResolveContext ec)
{
return this;
}
public override Expression DoResolveLValue (ResolveContext ec, Expression right_side)
{
return this;
}
public override void Emit (EmitContext ec)
{
Expression e = (Expression) new_instance.instance;
e.Emit (ec);
}
#region IMemoryLocation Members
public void AddressOf (EmitContext ec, AddressOp mode)
{
new_instance.instance.AddressOf (ec, mode);
}
#endregion
}
CollectionOrObjectInitializers initializers;
IMemoryLocation instance;
public NewInitialize (Expression requested_type, Arguments arguments, CollectionOrObjectInitializers initializers, Location l)
: base (requested_type, arguments, l)
{
this.initializers = initializers;
}
protected override IMemoryLocation EmitAddressOf (EmitContext ec, AddressOp Mode)
{
instance = base.EmitAddressOf (ec, Mode);
if (!initializers.IsEmpty)
initializers.Emit (ec);
return instance;
}
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 CreateExpressionTree (ResolveContext ec)
{
Arguments args = new Arguments (2);
args.Add (new Argument (base.CreateExpressionTree (ec)));
if (!initializers.IsEmpty)
args.Add (new Argument (initializers.CreateExpressionTree (ec)));
return CreateExpressionFactoryCall (ec,
initializers.IsCollectionInitializer ? "ListInit" : "MemberInit",
args);
}
public override Expression DoResolve (ResolveContext ec)
{
if (eclass != ExprClass.Invalid)
return this;
Expression e = base.DoResolve (ec);
if (type == null)
return null;
Expression previous = ec.CurrentInitializerVariable;
ec.CurrentInitializerVariable = new InitializerTargetExpression (this);
initializers.Resolve (ec);
ec.CurrentInitializerVariable = previous;
return e;
}
public override bool Emit (EmitContext ec, IMemoryLocation target)
{
bool left_on_stack = base.Emit (ec, target);
if (initializers.IsEmpty)
return left_on_stack;
LocalTemporary temp = target as LocalTemporary;
if (temp == null) {
if (!left_on_stack) {
VariableReference vr = target as VariableReference;
// FIXME: This still does not work correctly for pre-set variables
if (vr != null && vr.IsRef)
target.AddressOf (ec, AddressOp.Load);
((Expression) target).Emit (ec);
left_on_stack = true;
}
temp = new LocalTemporary (type);
}
instance = temp;
if (left_on_stack)
temp.Store (ec);
initializers.Emit (ec);
if (left_on_stack) {
temp.Emit (ec);
temp.Release (ec);
}
return left_on_stack;
}
public override bool HasInitializer {
get {
return !initializers.IsEmpty;
}
}
public override void MutateHoistedGenericType (AnonymousMethodStorey storey)
{
base.MutateHoistedGenericType (storey);
initializers.MutateHoistedGenericType (storey);
}
}
public class NewAnonymousType : New
{
static readonly ArrayList EmptyParameters = new ArrayList (0);
ArrayList parameters;
readonly TypeContainer parent;
AnonymousTypeClass anonymous_type;
public NewAnonymousType (ArrayList parameters, TypeContainer parent, Location loc)
: base (null, null, loc)
{
this.parameters = parameters;
this.parent = parent;
}
protected override void CloneTo (CloneContext clonectx, Expression target)
{
if (parameters == null)
return;
NewAnonymousType t = (NewAnonymousType) target;
t.parameters = new ArrayList (parameters.Count);
foreach (AnonymousTypeParameter atp in parameters)
t.parameters.Add (atp.Clone (clonectx));
}
AnonymousTypeClass CreateAnonymousType (ResolveContext ec, ArrayList parameters)
{
AnonymousTypeClass type = parent.Module.GetAnonymousType (parameters);
if (type != null)
return type;
type = AnonymousTypeClass.Create (ec.Compiler, parent, parameters, loc);
if (type == null)
return null;
type.DefineType ();
type.Define ();
type.EmitType ();
if (ec.Report.Errors == 0)
type.CloseType ();
parent.Module.AddAnonymousType (type);
return type;
}
public override Expression CreateExpressionTree (ResolveContext ec)
{
#if GMCS_SOURCE
if (parameters == null)
return base.CreateExpressionTree (ec);
ArrayList init = new ArrayList (parameters.Count);
foreach (Property p in anonymous_type.Properties)
init.Add (new TypeOfMethod (TypeBuilder.GetMethod (type, p.GetBuilder), loc));
ArrayList ctor_args = new ArrayList (Arguments.Count);
foreach (Argument a in Arguments)
ctor_args.Add (a.CreateExpressionTree (ec));
Arguments args = new Arguments (3);
args.Add (new Argument (method.CreateExpressionTree (ec)));
args.Add (new Argument (new ArrayCreation (TypeManager.expression_type_expr, "[]", ctor_args, loc)));
args.Add (new Argument (new ImplicitlyTypedArrayCreation ("[]", init, loc)));
return CreateExpressionFactoryCall (ec, "New", args);
#else
throw new NotSupportedException ();
#endif
}
public override Expression DoResolve (ResolveContext ec)
{
if (ec.HasSet (ResolveContext.Options.ConstantScope)) {
ec.Report.Error (836, loc, "Anonymous types cannot be used in this expression");
return null;
}
if (parameters == null) {
anonymous_type = CreateAnonymousType (ec, EmptyParameters);
RequestedType = new TypeExpression (anonymous_type.TypeBuilder, loc);
return base.DoResolve (ec);
}
bool error = false;
Arguments = new Arguments (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 (ec, parameters);
if (anonymous_type == null)
return null;
RequestedType = new GenericTypeExpr (anonymous_type.TypeBuilder, new TypeArguments (t_args), loc);
return base.DoResolve (ec);
}
}
public class AnonymousTypeParameter : Expression
{
public readonly string Name;
Expression initializer;
public override IEnumerable<IVisitable> GetChildrenX(object context)
{
return Visitable.Container().Single("initializer", initializer);
}
public override string GetNameX()
{
return Name;
}
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 Expression CreateExpressionTree (ResolveContext ec)
{
throw new NotSupportedException ("ET");
}
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 (ResolveContext ec)
{
Expression e = initializer.Resolve (ec);
if (e == null)
return null;
if (e.eclass == ExprClass.MethodGroup) {
Error_InvalidInitializer (ec, e.ExprClassName);
return null;
}
type = e.Type;
if (type == TypeManager.void_type || type == TypeManager.null_type ||
type == InternalType.AnonymousMethod || type.IsPointer) {
Error_InvalidInitializer (ec, e.GetSignatureForError ());
return null;
}
return e;
}
protected virtual void Error_InvalidInitializer (ResolveContext ec, string initializer)
{
ec.Report.Error (828, loc, "An anonymous type property `{0}' cannot be initialized with `{1}'",
Name, initializer);
}
public override void Emit (EmitContext ec)
{
throw new InternalErrorException ("Should not be reached");
}
}
}
Submit an article or tip