217 lines
8.2 KiB
C++
217 lines
8.2 KiB
C++
//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
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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 the LLVM research group 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 file implements the default intrinsic lowering implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/IntrinsicLowering.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Instructions.h"
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#include <iostream>
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using namespace llvm;
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template <class ArgIt>
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static Function *EnsureFunctionExists(Module &M, const char *Name,
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ArgIt ArgBegin, ArgIt ArgEnd,
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const Type *RetTy) {
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if (Function *F = M.getNamedFunction(Name)) return F;
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// It doesn't already exist in the program, insert a new definition now.
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std::vector<const Type *> ParamTys;
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for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
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ParamTys.push_back(I->getType());
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return M.getOrInsertFunction(Name, FunctionType::get(RetTy, ParamTys, false));
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}
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/// ReplaceCallWith - This function is used when we want to lower an intrinsic
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/// call to a call of an external function. This handles hard cases such as
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/// when there was already a prototype for the external function, and if that
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/// prototype doesn't match the arguments we expect to pass in.
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template <class ArgIt>
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static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
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ArgIt ArgBegin, ArgIt ArgEnd,
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const Type *RetTy, Function *&FCache) {
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if (!FCache) {
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// If we haven't already looked up this function, check to see if the
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// program already contains a function with this name.
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Module *M = CI->getParent()->getParent()->getParent();
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FCache = M->getNamedFunction(NewFn);
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if (!FCache) {
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// It doesn't already exist in the program, insert a new definition now.
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std::vector<const Type *> ParamTys;
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for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
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ParamTys.push_back((*I)->getType());
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FCache = M->getOrInsertFunction(NewFn,
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FunctionType::get(RetTy, ParamTys, false));
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}
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}
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const FunctionType *FT = FCache->getFunctionType();
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std::vector<Value*> Operands;
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unsigned ArgNo = 0;
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for (ArgIt I = ArgBegin; I != ArgEnd && ArgNo != FT->getNumParams();
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++I, ++ArgNo) {
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Value *Arg = *I;
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if (Arg->getType() != FT->getParamType(ArgNo))
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Arg = new CastInst(Arg, FT->getParamType(ArgNo), Arg->getName(), CI);
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Operands.push_back(Arg);
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}
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// Pass nulls into any additional arguments...
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for (; ArgNo != FT->getNumParams(); ++ArgNo)
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Operands.push_back(Constant::getNullValue(FT->getParamType(ArgNo)));
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std::string Name = CI->getName(); CI->setName("");
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if (FT->getReturnType() == Type::VoidTy) Name.clear();
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CallInst *NewCI = new CallInst(FCache, Operands, Name, CI);
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if (!CI->use_empty()) {
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Value *V = NewCI;
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if (CI->getType() != NewCI->getType())
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V = new CastInst(NewCI, CI->getType(), Name, CI);
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CI->replaceAllUsesWith(V);
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}
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return NewCI;
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}
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void DefaultIntrinsicLowering::AddPrototypes(Module &M) {
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->isExternal() && !I->use_empty())
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switch (I->getIntrinsicID()) {
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default: break;
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case Intrinsic::setjmp:
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EnsureFunctionExists(M, "setjmp", I->abegin(), I->aend(), Type::IntTy);
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break;
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case Intrinsic::longjmp:
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EnsureFunctionExists(M, "longjmp", I->abegin(), I->aend(),Type::VoidTy);
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break;
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case Intrinsic::siglongjmp:
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EnsureFunctionExists(M, "abort", I->aend(), I->aend(), Type::VoidTy);
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break;
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case Intrinsic::memcpy:
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EnsureFunctionExists(M, "memcpy", I->abegin(), --I->aend(),
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I->abegin()->getType());
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break;
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case Intrinsic::memmove:
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EnsureFunctionExists(M, "memmove", I->abegin(), --I->aend(),
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I->abegin()->getType());
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break;
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case Intrinsic::memset:
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EnsureFunctionExists(M, "memset", I->abegin(), --I->aend(),
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I->abegin()->getType());
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break;
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case Intrinsic::isunordered:
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EnsureFunctionExists(M, "isunordered", I->abegin(), I->aend(), Type::BoolTy);
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break;
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}
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}
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void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
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Function *Callee = CI->getCalledFunction();
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assert(Callee && "Cannot lower an indirect call!");
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switch (Callee->getIntrinsicID()) {
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case Intrinsic::not_intrinsic:
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std::cerr << "Cannot lower a call to a non-intrinsic function '"
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<< Callee->getName() << "'!\n";
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abort();
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default:
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std::cerr << "Error: Code generator does not support intrinsic function '"
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<< Callee->getName() << "'!\n";
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abort();
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// The setjmp/longjmp intrinsics should only exist in the code if it was
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// never optimized (ie, right out of the CFE), or if it has been hacked on
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// by the lowerinvoke pass. In both cases, the right thing to do is to
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// convert the call to an explicit setjmp or longjmp call.
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case Intrinsic::setjmp: {
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static Function *SetjmpFCache = 0;
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Value *V = ReplaceCallWith("setjmp", CI, CI->op_begin()+1, CI->op_end(),
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Type::IntTy, SetjmpFCache);
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if (CI->getType() != Type::VoidTy)
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CI->replaceAllUsesWith(V);
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break;
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}
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case Intrinsic::sigsetjmp:
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if (CI->getType() != Type::VoidTy)
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CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
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break;
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case Intrinsic::longjmp: {
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static Function *LongjmpFCache = 0;
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ReplaceCallWith("longjmp", CI, CI->op_begin()+1, CI->op_end(),
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Type::VoidTy, LongjmpFCache);
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break;
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}
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case Intrinsic::siglongjmp: {
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// Insert the call to abort
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static Function *AbortFCache = 0;
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ReplaceCallWith("abort", CI, CI->op_end(), CI->op_end(), Type::VoidTy,
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AbortFCache);
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break;
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}
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case Intrinsic::returnaddress:
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case Intrinsic::frameaddress:
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std::cerr << "WARNING: this target does not support the llvm."
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<< (Callee->getIntrinsicID() == Intrinsic::returnaddress ?
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"return" : "frame") << "address intrinsic.\n";
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CI->replaceAllUsesWith(ConstantPointerNull::get(
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cast<PointerType>(CI->getType())));
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break;
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case Intrinsic::dbg_stoppoint:
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case Intrinsic::dbg_region_start:
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case Intrinsic::dbg_region_end:
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case Intrinsic::dbg_declare:
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case Intrinsic::dbg_func_start:
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if (CI->getType() != Type::VoidTy)
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CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
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break; // Simply strip out debugging intrinsics
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case Intrinsic::memcpy: {
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// The memcpy intrinsic take an extra alignment argument that the memcpy
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// libc function does not.
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static Function *MemcpyFCache = 0;
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ReplaceCallWith("memcpy", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemcpyFCache);
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break;
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}
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case Intrinsic::memmove: {
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// The memmove intrinsic take an extra alignment argument that the memmove
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// libc function does not.
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static Function *MemmoveFCache = 0;
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ReplaceCallWith("memmove", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemmoveFCache);
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break;
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}
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case Intrinsic::memset: {
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// The memset intrinsic take an extra alignment argument that the memset
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// libc function does not.
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static Function *MemsetFCache = 0;
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ReplaceCallWith("memset", CI, CI->op_begin()+1, CI->op_end()-1,
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(*(CI->op_begin()+1))->getType(), MemsetFCache);
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break;
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}
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case Intrinsic::isunordered: {
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static Function *isunorderedFCache = 0;
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ReplaceCallWith("isunordered", CI, CI->op_begin()+1, CI->op_end(),
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Type::BoolTy, isunorderedFCache);
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break;
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}
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}
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assert(CI->use_empty() &&
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"Lowering should have eliminated any uses of the intrinsic call!");
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CI->getParent()->getInstList().erase(CI);
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}
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