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BinderILEmit.cs
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/
BinderILEmit.cs
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// Copyright (c) Alexandre Mutel. All rights reserved.
// This file is licensed under the BSD-Clause 2 license.
// See the license.txt file in the project root for more information.
using Microsoft.CodeAnalysis.CodeGen;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
namespace Microsoft.CodeAnalysis.CSharp
{
internal partial class Binder
{
private bool TryCompilerIntrinsic(InvocationExpressionSyntax node, BoundExpression methodCall, DiagnosticBag diagnostics, out BoundExpression result)
{
result = null;
// We expect only a BoundCall
var call = methodCall as BoundMethodGroup;
if (call == null)
{
return false;
}
MethodSymbol method = null;
var generic = node.Expression as GenericNameSyntax;
if (generic != null && generic.TypeArgumentList.Arguments.Count != 1)
{
return false;
}
foreach (var checkMethod in call.Methods)
{
var sourceMethodSymbol = checkMethod as SourceMethodSymbol;
// Check that the method signature of the epecting method:
// [CompilerIntrinsic]
// extern void xxxx(string arg);
if (sourceMethodSymbol != null && sourceMethodSymbol.IsCompilerIntrinsic && (checkMethod.ReturnsVoid || (generic != null && checkMethod.TypeArguments.Length == 1 && checkMethod.ReturnType == checkMethod.TypeArguments[0])))
{
method = checkMethod;
break;
}
}
if (method == null)
{
return false;
}
if (node.ArgumentList.Arguments.Count < 1)
{
diagnostics.Add(ErrorCode.ERR_BadArgCount, node.Expression.Location);
return false;
}
var arg0 = node.ArgumentList.Arguments[0];
var ilName = arg0.ToString().TrimStart('@'); // remove @ for keyword arguments
// Get IL instruction
var inst = ILInstruction.Get(ilName);
if (inst == null)
{
diagnostics.Add(ErrorCode.ERR_ILInvalidInstruction, arg0.Location);
return false;
}
var expectedArgCount = inst.Argument == OpCodeArg.None ? 1 : 2;
// Add more checks
if (node.ArgumentList.Arguments.Count != expectedArgCount)
{
diagnostics.Add(ErrorCode.ERR_BadArgCount, node.Expression.Location);
return false;
}
BoundExpression bound = null;
// Check argument
if (inst.Argument != OpCodeArg.None)
{
var arg1 = node.ArgumentList.Arguments[1];
var errCode = ErrorCode.ERR_ArgsInvalid;
// Perform various checks here
switch (inst.Argument)
{
case OpCodeArg.Target32:
bound = this.BindLabel(arg1.Expression, diagnostics) as BoundLabel;
if (bound == null)
{
errCode = ErrorCode.ERR_LabelNotFound;
}
break;
case OpCodeArg.Target8:
bound = this.BindLabel(arg1.Expression, diagnostics) as BoundLabel;
if (bound == null)
{
errCode = ErrorCode.ERR_LabelNotFound;
}
break;
case OpCodeArg.Method:
case OpCodeArg.CallSite:
{
var methodBound = this.BindExpression(arg1.Expression, diagnostics);
if (methodBound == null || (!(methodBound is BoundCall) && !(methodBound is BoundMethodGroup)))
{
// TODO: log proper error
errCode = ErrorCode.ERR_MethodNameExpected;
}
else
{
bound = methodBound;
}
break;
}
case OpCodeArg.ElementType:
case OpCodeArg.TypeToken:
case OpCodeArg.Class:
bound = this.BindExpression(arg1.Expression, diagnostics) as BoundTypeExpression;
if (bound == null)
{
errCode = ErrorCode.ERR_TypeExpected;
}
break;
case OpCodeArg.Field:
bound = BindExpression(arg1.Expression, diagnostics) as BoundFieldAccess;
if (bound == null)
{
// TODO: log proper error
errCode = ErrorCode.ERR_BadAccess;
}
break;
case OpCodeArg.String:
bound = BindExpression(arg1.Expression, diagnostics) as BoundLiteral;
if (bound == null || !bound.ConstantValue.IsString)
{
// TODO: log proper error
bound = null;
errCode = ErrorCode.ERR_ExpectedVerbatimLiteral;
}
break;
case OpCodeArg.Token:
var tokenExpression = BindExpression(arg1.Expression, diagnostics);
if (tokenExpression is BoundTypeExpression || tokenExpression is BoundFieldAccess || tokenExpression is BoundCall || (tokenExpression is BoundMethodGroup && ((BoundMethodGroup)tokenExpression).Methods.Length == 1))
{
bound = tokenExpression;
}
else
{
// TODO: log proper error
errCode = ErrorCode.ERR_ArgsInvalid;
}
break;
case OpCodeArg.Constructor:
bound = BindExpression(arg1.Expression, diagnostics) as BoundObjectCreationExpression;
if (bound == null)
{
// TODO: log proper error
errCode = ErrorCode.ERR_ArgsInvalid;
}
break;
case OpCodeArg.ArgumentVar:
bound = BindExpression(arg1.Expression, diagnostics) as BoundParameter;
if (bound == null)
{
// TODO: log proper error
errCode = ErrorCode.ERR_ArgsInvalid;
}
break;
case OpCodeArg.LocalVar:
bound = BindExpression(arg1.Expression, diagnostics) as BoundLocal;
if (bound == null)
{
// TODO: log proper error
errCode = ErrorCode.ERR_ArgsInvalid;
}
break;
case OpCodeArg.Int8:
case OpCodeArg.UInt8:
case OpCodeArg.UInt16:
case OpCodeArg.Int32:
case OpCodeArg.UInt32:
case OpCodeArg.Int64:
case OpCodeArg.UInt64:
case OpCodeArg.Float32:
case OpCodeArg.Float64:
// TODO: Handle correctly arguments
bound = BindExpression(arg1.Expression, diagnostics) as BoundLiteral;
if (bound == null || (!bound.ConstantValue.IsNumeric && !bound.ConstantValue.IsFloating))
{
// TODO: log proper error
bound = null;
errCode = ErrorCode.ERR_ArgsInvalid;
}
break;
}
// If we have not been able to bind anything, we have an error
if (bound == null)
{
diagnostics.Add(errCode, arg1.Location);
return false;
}
}
// Emit BoundILEmit here
TypeSymbol emitType = Compilation.GetSpecialType(SpecialType.System_Void);
var genericType = generic != null ? generic.TypeArgumentList.Arguments[0] : null;
if (genericType != null)
{
emitType = BindType(genericType, diagnostics);
}
result = new BoundILEmit(call.Syntax, emitType)
{
ILInstruction = inst,
Bound = bound
};
return true;
}
}
}