|
public EmitConvertToBool ( |
||
| expr | ||
| negation | bool | |
| Résultat | void | |
internal override TypeSymbol Emit(CodeGenerator cg)
{
var result_type = cg.DeclaringCompilation.GetTypeFromTypeRef(cg.Routine, this.TypeRefMask);
if (this.IfTrue != null)
{
object trueLbl = new object();
object endLbl = new object();
// Cond ? True : False
cg.EmitConvert(this.Condition, cg.CoreTypes.Boolean); // i4
cg.Builder.EmitBranch(ILOpCode.Brtrue, trueLbl);
// false:
cg.EmitConvert(this.IfFalse, result_type);
cg.Builder.EmitBranch(ILOpCode.Br, endLbl);
cg.Builder.AdjustStack(-1); // workarounds assert in ILBuilder.MarkLabel, we're doing something wrong with ILBuilder
// trueLbl:
cg.Builder.MarkLabel(trueLbl);
cg.EmitConvert(this.IfTrue, result_type);
// endLbl:
cg.Builder.MarkLabel(endLbl);
}
else
{
object trueLbl = new object();
object endLbl = new object();
// Cond ?: False
// <stack> = <cond_var> = Cond
var cond_type = cg.Emit(this.Condition);
var cond_var = cg.GetTemporaryLocal(cond_type);
cg.Builder.EmitOpCode(ILOpCode.Dup);
cg.Builder.EmitLocalStore(cond_var);
cg.EmitConvertToBool(cond_type, this.Condition.TypeRefMask);
cg.Builder.EmitBranch(ILOpCode.Brtrue, trueLbl);
// false:
cg.EmitConvert(this.IfFalse, result_type);
cg.Builder.EmitBranch(ILOpCode.Br, endLbl);
cg.Builder.AdjustStack(-1); // workarounds assert in ILBuilder.MarkLabel, we're doing something wrong with ILBuilder
// trueLbl:
cg.Builder.MarkLabel(trueLbl);
cg.Builder.EmitLocalLoad(cond_var);
cg.EmitConvert(cond_type, this.Condition.TypeRefMask, result_type);
// endLbl:
cg.Builder.MarkLabel(endLbl);
//
cg.ReturnTemporaryLocal(cond_var);
}
//
if (Access.IsNone)
{
cg.EmitPop(result_type);
result_type = cg.CoreTypes.Void;
}
//
return result_type;
}
internal override TypeSymbol Emit(CodeGenerator cg)
{
Debug.Assert(Access.IsRead || Access.IsNone);
TypeSymbol returned_type;
switch (this.Operation)
{
case Operations.AtSign:
// special arrangement
// Template:
// context.DisableErrorReporting();
// s;
// context.EnableErrorReporting();
returned_type = cg.EmitWithDisabledErrorReporting(Operand);
break;
case Operations.BitNegation:
//Template: "~x" Operators.BitNot(x)
returned_type = EmitBitNot(cg);
break;
case Operations.Clone:
// Template: clone x
Debug.WriteLine("TODO: clone(object)");
returned_type = cg.Emit(Operand); // TODO: clone
break;
case Operations.LogicNegation:
//Template: !(bool)(x);
cg.EmitConvertToBool(this.Operand, true);
returned_type = cg.CoreTypes.Boolean;
break;
case Operations.Minus:
//Template: "-x"
returned_type = EmitMinus(cg);
break;
case Operations.Plus:
//Template: "+x"
returned_type = EmitPlus(cg);
break;
case Operations.ObjectCast:
//Template: "(object)x"
cg.EmitConvert(this.Operand, cg.CoreTypes.Object);
returned_type = cg.CoreTypes.Object;
break;
case Operations.Print:
cg.EmitEcho(this.Operand);
if (Access.IsRead)
{
// Always returns 1
cg.Builder.EmitLongConstant(1);
returned_type = cg.CoreTypes.Long;
}
else
{
// nobody reads the result anyway
returned_type = cg.CoreTypes.Void;
}
break;
case Operations.BoolCast:
//Template: "(bool)x"
cg.EmitConvert(this.Operand, cg.CoreTypes.Boolean);
returned_type = cg.CoreTypes.Boolean;
break;
case Operations.Int8Cast:
case Operations.Int16Cast:
case Operations.Int32Cast:
case Operations.UInt8Cast:
case Operations.UInt16Cast:
case Operations.UInt64Cast:
case Operations.UInt32Cast:
case Operations.Int64Cast:
cg.EmitConvert(this.Operand, cg.CoreTypes.Long);
returned_type = cg.CoreTypes.Long;
break;
case Operations.DecimalCast:
case Operations.DoubleCast:
case Operations.FloatCast:
cg.EmitConvert(this.Operand, cg.CoreTypes.Double);
returned_type = cg.CoreTypes.Double;
break;
case Operations.UnicodeCast: // TODO
case Operations.StringCast:
// (string)x
cg.EmitConvert(this.Operand, cg.CoreTypes.String); // TODO: to String or PhpString ? to not corrupt single-byte string
return cg.CoreTypes.String;
case Operations.BinaryCast:
//if ((returned_typecode = node.Expr.Emit(codeGenerator)) != PhpTypeCode.PhpBytes)
//{
// codeGenerator.EmitBoxing(returned_typecode);
// //codeGenerator.EmitLoadClassContext();
// il.Emit(OpCodes.Call, Methods.Convert.ObjectToPhpBytes);
// returned_typecode = PhpTypeCode.PhpBytes;
//}
//break;
throw new NotImplementedException();
case Operations.ArrayCast:
//Template: "(array)x"
cg.EmitConvert(this.Operand, cg.CoreTypes.PhpArray); // TODO: EmitArrayCast()
returned_type = cg.CoreTypes.PhpArray;
break;
case Operations.UnsetCast:
// Template: "(unset)x" null
cg.EmitPop(cg.Emit(this.Operand));
if (this.Access.IsRead)
{
cg.Builder.EmitNullConstant();
returned_type = cg.CoreTypes.Object;
}
else
{
returned_type = cg.CoreTypes.Void;
}
break;
default:
throw ExceptionUtilities.Unreachable;
}
switch (Access.Flags)
{
case AccessMask.Read:
Debug.Assert(returned_type.SpecialType != SpecialType.System_Void);
// do nothing
break;
case AccessMask.None:
// pop operation's result value from stack
cg.EmitPop(returned_type);
returned_type = cg.CoreTypes.Void;
break;
default:
throw ExceptionUtilities.UnexpectedValue(Access);
}
return returned_type;
}