| //===---- 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/Basic/TargetInfo.h" |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Builtins.h" |
| #include "clang/AST/Expr.h" |
| #include "clang/AST/TargetBuiltins.h" |
| #include "llvm/Constants.h" |
| #include "llvm/Function.h" |
| #include "llvm/Intrinsics.h" |
| |
| using namespace clang; |
| using namespace CodeGen; |
| |
| using namespace llvm; |
| |
| RValue CodeGenFunction::EmitBuiltinExpr(unsigned BuiltinID, const CallExpr *E) { |
| switch (BuiltinID) { |
| default: { |
| if (getContext().BuiltinInfo.isLibFunction(BuiltinID)) |
| return EmitCallExpr(CGM.getBuiltinLibFunction(BuiltinID), E); |
| |
| // See if we have a target specific intrinsic. |
| llvm::Intrinsic::ID IntrinsicID; |
| const char *TargetPrefix = Target.getTargetPrefix(); |
| const char *BuiltinName = getContext().BuiltinInfo.GetName(BuiltinID); |
| #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN |
| #include "llvm/Intrinsics.gen" |
| #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN |
| |
| if (IntrinsicID != Intrinsic::not_intrinsic) { |
| llvm::SmallVector<llvm::Value*, 16> Args; |
| |
| llvm::Function *F = llvm::Intrinsic::getDeclaration(&CGM.getModule(), |
| IntrinsicID); |
| |
| const llvm::FunctionType *FTy = F->getFunctionType(); |
| |
| for (unsigned i = 0, e = E->getNumArgs(); i != e; ++i) { |
| llvm::Value *ArgValue = EmitScalarExpr(E->getArg(i)); |
| |
| // If the intrinsic arg type is different from the builtin arg type |
| // we need to do a bit cast. |
| const llvm::Type *PTy = FTy->getParamType(i); |
| if (PTy != ArgValue->getType()) { |
| assert(PTy->canLosslesslyBitCastTo(FTy->getParamType(i)) && |
| "Must be able to losslessly bit cast to param"); |
| ArgValue = Builder.CreateBitCast(ArgValue, PTy); |
| } |
| |
| Args.push_back(ArgValue); |
| } |
| |
| llvm::Value *V = Builder.CreateCall(F, &Args[0], &Args[0] + Args.size()); |
| |
| QualType BuiltinRetType = E->getType(); |
| |
| const llvm::Type *RetTy = BuiltinRetType->isVoidType() ? |
| llvm::Type::VoidTy : ConvertType(BuiltinRetType); |
| |
| if (RetTy != V->getType()) { |
| assert(V->getType()->canLosslesslyBitCastTo(RetTy) && |
| "Must be able to losslessly bit cast result type"); |
| |
| V = Builder.CreateBitCast(V, RetTy); |
| } |
| |
| return RValue::get(V); |
| } |
| |
| // See if we have a target specific builtin that needs to be lowered. |
| llvm::Value *V = 0; |
| |
| if (strcmp(TargetPrefix, "x86") == 0) |
| V = EmitX86BuiltinExpr(BuiltinID, E); |
| else if (strcmp(TargetPrefix, "ppc") == 0) |
| V = EmitPPCBuiltinExpr(BuiltinID, E); |
| |
| if (V) |
| return RValue::get(V); |
| |
| WarnUnsupported(E, "builtin function"); |
| |
| // 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 (1) { |
| if (const ParenExpr *PE = dyn_cast<ParenExpr>(Arg)) |
| Arg = PE->getSubExpr(); |
| else if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(Arg)) |
| Arg = CE->getSubExpr(); |
| else |
| break; |
| } |
| |
| 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); |
| } |
| case Builtin::BI__builtin_classify_type: { |
| llvm::APSInt Result(32); |
| |
| if (!E->isBuiltinClassifyType(Result)) |
| assert(0 && "Expr not __builtin_classify_type!"); |
| |
| return RValue::get(llvm::ConstantInt::get(Result)); |
| } |
| case Builtin::BI__builtin_constant_p: { |
| llvm::APSInt Result(32); |
| |
| // FIXME: Analyze the parameter and check if it is a constant. |
| Result = 0; |
| |
| return RValue::get(llvm::ConstantInt::get(Result)); |
| } |
| case Builtin::BI__builtin_abs: { |
| llvm::Value *ArgValue = EmitScalarExpr(E->getArg(0)); |
| |
| llvm::BinaryOperator *NegOp = |
| Builder.CreateNeg(ArgValue, (ArgValue->getName() + "neg").c_str()); |
| llvm::Value *CmpResult = |
| Builder.CreateICmpSGE(ArgValue, NegOp->getOperand(0), "abscond"); |
| llvm::Value *Result = |
| Builder.CreateSelect(CmpResult, ArgValue, NegOp, "abs"); |
| |
| return RValue::get(Result); |
| } |
| case Builtin::BI__builtin_expect: { |
| llvm::Value *Condition = EmitScalarExpr(E->getArg(0)); |
| return RValue::get(Condition); |
| } |
| case Builtin::BI__builtin_bswap32: |
| case Builtin::BI__builtin_bswap64: { |
| llvm::Value *ArgValue = EmitScalarExpr(E->getArg(0)); |
| const llvm::Type *ArgType = ArgValue->getType(); |
| llvm::Value *F = |
| llvm::Intrinsic::getDeclaration(&CGM.getModule(), |
| llvm::Intrinsic::bswap, |
| &ArgType, 1); |
| llvm::Value *V = Builder.CreateCall(F, ArgValue, "tmp"); |
| |
| return RValue::get(V); |
| } |
| case Builtin::BI__builtin_inff: { |
| llvm::APFloat f(llvm::APFloat::IEEEsingle, |
| llvm::APFloat::fcInfinity, false); |
| |
| llvm::Value *V = llvm::ConstantFP::get(llvm::Type::FloatTy, f); |
| return RValue::get(V); |
| } |
| case Builtin::BI__builtin_inf: |
| // FIXME: mapping long double onto double. |
| case Builtin::BI__builtin_infl: { |
| llvm::APFloat f(llvm::APFloat::IEEEdouble, |
| llvm::APFloat::fcInfinity, false); |
| |
| llvm::Value *V = llvm::ConstantFP::get(llvm::Type::DoubleTy, f); |
| return RValue::get(V); |
| } |
| } |
| return RValue::get(0); |
| } |
| |
| llvm::Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID, |
| const CallExpr *E) |
| { |
| switch (BuiltinID) { |
| default: return 0; |
| case X86::BI__builtin_ia32_mulps: |
| return Builder.CreateMul(EmitScalarExpr(E->getArg(0)), |
| EmitScalarExpr(E->getArg(1)), |
| "mulps"); |
| } |
| } |
| |
| llvm::Value *CodeGenFunction::EmitPPCBuiltinExpr(unsigned BuiltinID, |
| const CallExpr *E) |
| { |
| switch (BuiltinID) { |
| default: return 0; |
| } |
| } |