зеркало из https://github.com/microsoft/clang-1.git
70 строки
2.5 KiB
C++
70 строки
2.5 KiB
C++
//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Anders Carlsson and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code to emit Builtin calls as LLVM code.
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//
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//===----------------------------------------------------------------------===//
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/Builtins.h"
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#include "clang/AST/Expr.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/Intrinsics.h"
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using namespace clang;
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using namespace CodeGen;
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RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) {
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switch (BuiltinID) {
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default:
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if (getContext().BuiltinInfo.isLibFunction(BuiltinID))
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return EmitCallExpr(CGM.getBuiltinLibFunction(BuiltinID), E);
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fprintf(stderr, "Unimplemented builtin!!\n");
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E->dump(getContext().SourceMgr);
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// Unknown builtin, for now just dump it out and return undef.
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if (hasAggregateLLVMType(E->getType()))
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return RValue::getAggregate(CreateTempAlloca(ConvertType(E->getType())));
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return RValue::get(llvm::UndefValue::get(ConvertType(E->getType())));
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case Builtin::BI__builtin___CFStringMakeConstantString: {
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const Expr *Arg = E->getArg(0);
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while (const ParenExpr *PE = dyn_cast<ParenExpr>(Arg))
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Arg = PE->getSubExpr();
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const StringLiteral *Literal = cast<StringLiteral>(Arg);
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std::string S(Literal->getStrData(), Literal->getByteLength());
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return RValue::get(CGM.GetAddrOfConstantCFString(S));
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}
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case Builtin::BI__builtin_va_start:
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case Builtin::BI__builtin_va_end: {
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llvm::Value *ArgValue = EmitScalarExpr(E->getArg(0));
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const llvm::Type *DestType = llvm::PointerType::get(llvm::Type::Int8Ty);
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if (ArgValue->getType() != DestType)
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ArgValue = Builder.CreateBitCast(ArgValue, DestType,
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ArgValue->getNameStart());
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llvm::Intrinsic::ID inst = (BuiltinID == Builtin::BI__builtin_va_start) ?
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llvm::Intrinsic::vastart : llvm::Intrinsic::vaend;
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llvm::Value *F = llvm::Intrinsic::getDeclaration(&CGM.getModule(), inst);
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llvm::Value *V = Builder.CreateCall(F, ArgValue);
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return RValue::get(V);
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}
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}
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return RValue::get(0);
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}
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