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