//===-- IntrinsicLowering.cpp - Intrinsic Lowering default implementation -===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This file implements the default intrinsic lowering implementation.
//
//===----------------------------------------------------------------------===//
-#include "llvm/IntrinsicLowering.h"
-#include "llvm/Constant.h"
-#include "llvm/Intrinsics.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
-#include "llvm/Type.h"
-#include "llvm/iOther.h"
+#include "llvm/Instructions.h"
+#include <iostream>
+
using namespace llvm;
+template <class ArgIt>
+static Function *EnsureFunctionExists(Module &M, const char *Name,
+ ArgIt ArgBegin, ArgIt ArgEnd,
+ const Type *RetTy) {
+ if (Function *F = M.getNamedFunction(Name)) return F;
+ // It doesn't already exist in the program, insert a new definition now.
+ std::vector<const Type *> ParamTys;
+ for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
+ ParamTys.push_back(I->getType());
+ return M.getOrInsertFunction(Name, FunctionType::get(RetTy, ParamTys, false));
+}
+
+/// ReplaceCallWith - This function is used when we want to lower an intrinsic
+/// call to a call of an external function. This handles hard cases such as
+/// when there was already a prototype for the external function, and if that
+/// prototype doesn't match the arguments we expect to pass in.
+template <class ArgIt>
+static CallInst *ReplaceCallWith(const char *NewFn, CallInst *CI,
+ ArgIt ArgBegin, ArgIt ArgEnd,
+ const Type *RetTy, Function *&FCache) {
+ if (!FCache) {
+ // If we haven't already looked up this function, check to see if the
+ // program already contains a function with this name.
+ Module *M = CI->getParent()->getParent()->getParent();
+ FCache = M->getNamedFunction(NewFn);
+ if (!FCache) {
+ // It doesn't already exist in the program, insert a new definition now.
+ std::vector<const Type *> ParamTys;
+ for (ArgIt I = ArgBegin; I != ArgEnd; ++I)
+ ParamTys.push_back((*I)->getType());
+ FCache = M->getOrInsertFunction(NewFn,
+ FunctionType::get(RetTy, ParamTys, false));
+ }
+ }
+
+ const FunctionType *FT = FCache->getFunctionType();
+ std::vector<Value*> Operands;
+ unsigned ArgNo = 0;
+ for (ArgIt I = ArgBegin; I != ArgEnd && ArgNo != FT->getNumParams();
+ ++I, ++ArgNo) {
+ Value *Arg = *I;
+ if (Arg->getType() != FT->getParamType(ArgNo))
+ Arg = new CastInst(Arg, FT->getParamType(ArgNo), Arg->getName(), CI);
+ Operands.push_back(Arg);
+ }
+ // Pass nulls into any additional arguments...
+ for (; ArgNo != FT->getNumParams(); ++ArgNo)
+ Operands.push_back(Constant::getNullValue(FT->getParamType(ArgNo)));
+
+ std::string Name = CI->getName(); CI->setName("");
+ if (FT->getReturnType() == Type::VoidTy) Name.clear();
+ CallInst *NewCI = new CallInst(FCache, Operands, Name, CI);
+ if (!CI->use_empty()) {
+ Value *V = NewCI;
+ if (CI->getType() != NewCI->getType())
+ V = new CastInst(NewCI, CI->getType(), Name, CI);
+ CI->replaceAllUsesWith(V);
+ }
+ return NewCI;
+}
+
+void DefaultIntrinsicLowering::AddPrototypes(Module &M) {
+ for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
+ if (I->isExternal() && !I->use_empty())
+ switch (I->getIntrinsicID()) {
+ default: break;
+ case Intrinsic::setjmp:
+ EnsureFunctionExists(M, "setjmp", I->arg_begin(), I->arg_end(), Type::IntTy);
+ break;
+ case Intrinsic::longjmp:
+ EnsureFunctionExists(M, "longjmp", I->arg_begin(), I->arg_end(),Type::VoidTy);
+ break;
+ case Intrinsic::siglongjmp:
+ EnsureFunctionExists(M, "abort", I->arg_end(), I->arg_end(), Type::VoidTy);
+ break;
+ case Intrinsic::memcpy:
+ EnsureFunctionExists(M, "memcpy", I->arg_begin(), --I->arg_end(),
+ I->arg_begin()->getType());
+ break;
+ case Intrinsic::memmove:
+ EnsureFunctionExists(M, "memmove", I->arg_begin(), --I->arg_end(),
+ I->arg_begin()->getType());
+ break;
+ case Intrinsic::memset:
+ EnsureFunctionExists(M, "memset", I->arg_begin(), --I->arg_end(),
+ I->arg_begin()->getType());
+ break;
+ case Intrinsic::isunordered:
+ EnsureFunctionExists(M, "isunordered", I->arg_begin(), I->arg_end(), Type::BoolTy);
+ break;
+ }
+
+}
+
void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
Function *Callee = CI->getCalledFunction();
assert(Callee && "Cannot lower an indirect call!");
-
- Module *M = Callee->getParent();
switch (Callee->getIntrinsicID()) {
case Intrinsic::not_intrinsic:
<< Callee->getName() << "'!\n";
abort();
- // The default implementation of setjmp/longjmp transforms setjmp into a
- // noop that always returns zero and longjmp into a call to abort. This
- // allows code that never longjmps to work correctly.
- case Intrinsic::setjmp:
+ // The setjmp/longjmp intrinsics should only exist in the code if it was
+ // never optimized (ie, right out of the CFE), or if it has been hacked on
+ // by the lowerinvoke pass. In both cases, the right thing to do is to
+ // convert the call to an explicit setjmp or longjmp call.
+ case Intrinsic::setjmp: {
+ static Function *SetjmpFCache = 0;
+ Value *V = ReplaceCallWith("setjmp", CI, CI->op_begin()+1, CI->op_end(),
+ Type::IntTy, SetjmpFCache);
+ if (CI->getType() != Type::VoidTy)
+ CI->replaceAllUsesWith(V);
+ break;
+ }
case Intrinsic::sigsetjmp:
+ if (CI->getType() != Type::VoidTy)
+ CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
+ break;
+
+ case Intrinsic::longjmp: {
+ static Function *LongjmpFCache = 0;
+ ReplaceCallWith("longjmp", CI, CI->op_begin()+1, CI->op_end(),
+ Type::VoidTy, LongjmpFCache);
+ break;
+ }
+
+ case Intrinsic::siglongjmp: {
+ // Insert the call to abort
+ static Function *AbortFCache = 0;
+ ReplaceCallWith("abort", CI, CI->op_end(), CI->op_end(), Type::VoidTy,
+ AbortFCache);
+ break;
+ }
+
+ case Intrinsic::returnaddress:
+ case Intrinsic::frameaddress:
+ std::cerr << "WARNING: this target does not support the llvm."
+ << (Callee->getIntrinsicID() == Intrinsic::returnaddress ?
+ "return" : "frame") << "address intrinsic.\n";
+ CI->replaceAllUsesWith(ConstantPointerNull::get(
+ cast<PointerType>(CI->getType())));
+ break;
+
+ case Intrinsic::prefetch:
+ break; // Simply strip out prefetches on unsupported architectures
+
+ case Intrinsic::pcmarker:
+ break; // Simply strip out pcmarker on unsupported architectures
+
+ case Intrinsic::dbg_stoppoint:
+ case Intrinsic::dbg_region_start:
+ case Intrinsic::dbg_region_end:
+ case Intrinsic::dbg_declare:
+ case Intrinsic::dbg_func_start:
if (CI->getType() != Type::VoidTy)
CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
+ break; // Simply strip out debugging intrinsics
+
+ case Intrinsic::memcpy: {
+ // The memcpy intrinsic take an extra alignment argument that the memcpy
+ // libc function does not.
+ static Function *MemcpyFCache = 0;
+ ReplaceCallWith("memcpy", CI, CI->op_begin()+1, CI->op_end()-1,
+ (*(CI->op_begin()+1))->getType(), MemcpyFCache);
break;
+ }
+ case Intrinsic::memmove: {
+ // The memmove intrinsic take an extra alignment argument that the memmove
+ // libc function does not.
+ static Function *MemmoveFCache = 0;
+ ReplaceCallWith("memmove", CI, CI->op_begin()+1, CI->op_end()-1,
+ (*(CI->op_begin()+1))->getType(), MemmoveFCache);
+ break;
+ }
+ case Intrinsic::memset: {
+ // The memset intrinsic take an extra alignment argument that the memset
+ // libc function does not.
+ static Function *MemsetFCache = 0;
+ ReplaceCallWith("memset", CI, CI->op_begin()+1, CI->op_end()-1,
+ (*(CI->op_begin()+1))->getType(), MemsetFCache);
+ break;
+ }
+ case Intrinsic::isunordered: {
+ Value *L = CI->getOperand(1);
+ Value *R = CI->getOperand(2);
- case Intrinsic::longjmp:
- case Intrinsic::siglongjmp:
- // Insert the call to abort
- new CallInst(M->getOrInsertFunction("abort", Type::VoidTy, 0), "", CI);
+ Value *LIsNan = new SetCondInst(Instruction::SetNE, L, L, "LIsNan", CI);
+ Value *RIsNan = new SetCondInst(Instruction::SetNE, R, R, "RIsNan", CI);
+ CI->replaceAllUsesWith(
+ BinaryOperator::create(Instruction::Or, LIsNan, RIsNan,
+ "isunordered", CI));
break;
}
+ }
assert(CI->use_empty() &&
"Lowering should have eliminated any uses of the intrinsic call!");
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