//
// 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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// pass invokable via the "opt" command at will.
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "lowersetjmp"
#include "llvm/Transforms/IPO.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
+#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CFG.h"
+#include "llvm/Support/Compiler.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/VectorExtras.h"
+#include "llvm/ADT/SmallVector.h"
+#include <map>
using namespace llvm;
-namespace {
- Statistic<> LongJmpsTransformed("lowersetjmp",
- "Number of longjmps transformed");
- Statistic<> SetJmpsTransformed("lowersetjmp",
- "Number of setjmps transformed");
- Statistic<> CallsTransformed("lowersetjmp",
- "Number of calls invokified");
- Statistic<> InvokesTransformed("lowersetjmp",
- "Number of invokes modified");
+STATISTIC(LongJmpsTransformed, "Number of longjmps transformed");
+STATISTIC(SetJmpsTransformed , "Number of setjmps transformed");
+STATISTIC(CallsTransformed , "Number of calls invokified");
+STATISTIC(InvokesTransformed , "Number of invokes modified");
+namespace {
//===--------------------------------------------------------------------===//
// LowerSetJmp pass implementation.
- class LowerSetJmp : public ModulePass,
+ class VISIBILITY_HIDDEN LowerSetJmp : public ModulePass,
public InstVisitor<LowerSetJmp> {
// LLVM library functions...
- Function* InitSJMap; // __llvm_sjljeh_init_setjmpmap
- Function* DestroySJMap; // __llvm_sjljeh_destroy_setjmpmap
- Function* AddSJToMap; // __llvm_sjljeh_add_setjmp_to_map
- Function* ThrowLongJmp; // __llvm_sjljeh_throw_longjmp
- Function* TryCatchLJ; // __llvm_sjljeh_try_catching_longjmp_exception
- Function* IsLJException; // __llvm_sjljeh_is_longjmp_exception
- Function* GetLJValue; // __llvm_sjljeh_get_longjmp_value
+ Constant *InitSJMap; // __llvm_sjljeh_init_setjmpmap
+ Constant *DestroySJMap; // __llvm_sjljeh_destroy_setjmpmap
+ Constant *AddSJToMap; // __llvm_sjljeh_add_setjmp_to_map
+ Constant *ThrowLongJmp; // __llvm_sjljeh_throw_longjmp
+ Constant *TryCatchLJ; // __llvm_sjljeh_try_catching_longjmp_exception
+ Constant *IsLJException; // __llvm_sjljeh_is_longjmp_exception
+ Constant *GetLJValue; // __llvm_sjljeh_get_longjmp_value
typedef std::pair<SwitchInst*, CallInst*> SwitchValuePair;
bool IsTransformableFunction(const std::string& Name);
public:
+ static char ID; // Pass identification, replacement for typeid
+ LowerSetJmp() : ModulePass(&ID) {}
+
void visitCallInst(CallInst& CI);
void visitInvokeInst(InvokeInst& II);
void visitReturnInst(ReturnInst& RI);
bool runOnModule(Module& M);
bool doInitialization(Module& M);
};
-
- RegisterOpt<LowerSetJmp> X("lowersetjmp", "Lower Set Jump");
} // end anonymous namespace
+char LowerSetJmp::ID = 0;
+static RegisterPass<LowerSetJmp> X("lowersetjmp", "Lower Set Jump");
+
// run - Run the transformation on the program. We grab the function
// prototypes for longjmp and setjmp. If they are used in the program,
// then we can go directly to the places they're at and transform them.
bool Changed = false;
// These are what the functions are called.
- Function* SetJmp = M.getNamedFunction("llvm.setjmp");
- Function* LongJmp = M.getNamedFunction("llvm.longjmp");
+ Function* SetJmp = M.getFunction("llvm.setjmp");
+ Function* LongJmp = M.getFunction("llvm.longjmp");
// This program doesn't have longjmp and setjmp calls.
if ((!LongJmp || LongJmp->use_empty()) &&
// This function is always successful, unless it isn't.
bool LowerSetJmp::doInitialization(Module& M)
{
- const Type *SBPTy = PointerType::get(Type::SByteTy);
- const Type *SBPPTy = PointerType::get(SBPTy);
+ const Type *SBPTy = PointerType::getUnqual(Type::Int8Ty);
+ const Type *SBPPTy = PointerType::getUnqual(SBPTy);
// N.B. See llvm/runtime/GCCLibraries/libexception/SJLJ-Exception.h for
// a description of the following library functions.
// void __llvm_sjljeh_init_setjmpmap(void**)
InitSJMap = M.getOrInsertFunction("__llvm_sjljeh_init_setjmpmap",
- Type::VoidTy, SBPPTy, NULL);
+ Type::VoidTy, SBPPTy, (Type *)0);
// void __llvm_sjljeh_destroy_setjmpmap(void**)
DestroySJMap = M.getOrInsertFunction("__llvm_sjljeh_destroy_setjmpmap",
- Type::VoidTy, SBPPTy, NULL);
+ Type::VoidTy, SBPPTy, (Type *)0);
// void __llvm_sjljeh_add_setjmp_to_map(void**, void*, unsigned)
AddSJToMap = M.getOrInsertFunction("__llvm_sjljeh_add_setjmp_to_map",
Type::VoidTy, SBPPTy, SBPTy,
- Type::UIntTy, NULL);
+ Type::Int32Ty, (Type *)0);
// void __llvm_sjljeh_throw_longjmp(int*, int)
ThrowLongJmp = M.getOrInsertFunction("__llvm_sjljeh_throw_longjmp",
- Type::VoidTy, SBPTy, Type::IntTy, NULL);
+ Type::VoidTy, SBPTy, Type::Int32Ty,
+ (Type *)0);
// unsigned __llvm_sjljeh_try_catching_longjmp_exception(void **)
TryCatchLJ =
M.getOrInsertFunction("__llvm_sjljeh_try_catching_longjmp_exception",
- Type::UIntTy, SBPPTy, NULL);
+ Type::Int32Ty, SBPPTy, (Type *)0);
// bool __llvm_sjljeh_is_longjmp_exception()
IsLJException = M.getOrInsertFunction("__llvm_sjljeh_is_longjmp_exception",
- Type::BoolTy, NULL);
+ Type::Int1Ty, (Type *)0);
// int __llvm_sjljeh_get_longjmp_value()
GetLJValue = M.getOrInsertFunction("__llvm_sjljeh_get_longjmp_value",
- Type::IntTy, NULL);
+ Type::Int32Ty, (Type *)0);
return true;
}
// throwing the exception for us.
void LowerSetJmp::TransformLongJmpCall(CallInst* Inst)
{
- const Type* SBPTy = PointerType::get(Type::SByteTy);
+ const Type* SBPTy = PointerType::getUnqual(Type::Int8Ty);
// Create the call to "__llvm_sjljeh_throw_longjmp". This takes the
// same parameters as "longjmp", except that the buffer is cast to a
// char*. It returns "void", so it doesn't need to replace any of
// Inst's uses and doesn't get a name.
- CastInst* CI = new CastInst(Inst->getOperand(1), SBPTy, "LJBuf", Inst);
- new CallInst(ThrowLongJmp, make_vector<Value*>(CI, Inst->getOperand(2), 0),
- "", Inst);
+ CastInst* CI =
+ new BitCastInst(Inst->getOperand(1), SBPTy, "LJBuf", Inst);
+ SmallVector<Value *, 2> Args;
+ Args.push_back(CI);
+ Args.push_back(Inst->getOperand(2));
+ CallInst::Create(ThrowLongJmp, Args.begin(), Args.end(), "", Inst);
SwitchValuePair& SVP = SwitchValMap[Inst->getParent()->getParent()];
// we should branch to the basic block that determines if this longjmp
// is applicable here. Otherwise, issue an unwind.
if (SVP.first)
- new BranchInst(SVP.first->getParent(), Inst);
+ BranchInst::Create(SVP.first->getParent(), Inst);
else
new UnwindInst(Inst);
assert(Inst && "Couldn't find even ONE instruction in entry block!");
// Fill in the alloca and call to initialize the SJ map.
- const Type *SBPTy = PointerType::get(Type::SByteTy);
+ const Type *SBPTy = PointerType::getUnqual(Type::Int8Ty);
AllocaInst* Map = new AllocaInst(SBPTy, 0, "SJMap", Inst);
- new CallInst(InitSJMap, make_vector<Value*>(Map, 0), "", Inst);
+ CallInst::Create(InitSJMap, Map, "", Inst);
return SJMap[Func] = Map;
}
// The basic block we're going to jump to if we need to rethrow the
// exception.
- BasicBlock* Rethrow = new BasicBlock("RethrowExcept", Func);
+ BasicBlock* Rethrow = BasicBlock::Create("RethrowExcept", Func);
// Fill in the "Rethrow" BB with a call to rethrow the exception. This
// is the last instruction in the BB since at this point the runtime
{
if (SwitchValMap[Func].first) return SwitchValMap[Func];
- BasicBlock* LongJmpPre = new BasicBlock("LongJmpBlkPre", Func);
- BasicBlock::InstListType& LongJmpPreIL = LongJmpPre->getInstList();
+ BasicBlock* LongJmpPre = BasicBlock::Create("LongJmpBlkPre", Func);
// Keep track of the preliminary basic block for some of the other
// transformations.
PrelimBBMap[Func] = LongJmpPre;
// Grab the exception.
- CallInst* Cond = new
- CallInst(IsLJException, std::vector<Value*>(), "IsLJExcept");
- LongJmpPreIL.push_back(Cond);
+ CallInst* Cond = CallInst::Create(IsLJException, "IsLJExcept", LongJmpPre);
// The "decision basic block" gets the number associated with the
// setjmp call returning to switch on and the value returned by
// longjmp.
- BasicBlock* DecisionBB = new BasicBlock("LJDecisionBB", Func);
- BasicBlock::InstListType& DecisionBBIL = DecisionBB->getInstList();
+ BasicBlock* DecisionBB = BasicBlock::Create("LJDecisionBB", Func);
- new BranchInst(DecisionBB, Rethrow, Cond, LongJmpPre);
+ BranchInst::Create(DecisionBB, Rethrow, Cond, LongJmpPre);
// Fill in the "decision" basic block.
- CallInst* LJVal = new CallInst(GetLJValue, std::vector<Value*>(), "LJVal");
- DecisionBBIL.push_back(LJVal);
- CallInst* SJNum = new
- CallInst(TryCatchLJ, make_vector<Value*>(GetSetJmpMap(Func), 0), "SJNum");
- DecisionBBIL.push_back(SJNum);
+ CallInst* LJVal = CallInst::Create(GetLJValue, "LJVal", DecisionBB);
+ CallInst* SJNum = CallInst::Create(TryCatchLJ, GetSetJmpMap(Func), "SJNum",
+ DecisionBB);
- SwitchInst* SI = new SwitchInst(SJNum, Rethrow, 0, DecisionBB);
+ SwitchInst* SI = SwitchInst::Create(SJNum, Rethrow, 0, DecisionBB);
return SwitchValMap[Func] = SwitchValuePair(SI, LJVal);
}
Function* Func = ABlock->getParent();
// Add this setjmp to the setjmp map.
- const Type* SBPTy = PointerType::get(Type::SByteTy);
- CastInst* BufPtr = new CastInst(Inst->getOperand(1), SBPTy, "SBJmpBuf", Inst);
- new CallInst(AddSJToMap,
- make_vector<Value*>(GetSetJmpMap(Func), BufPtr,
- ConstantUInt::get(Type::UIntTy,
- SetJmpIDMap[Func]++), 0),
- "", Inst);
+ const Type* SBPTy = PointerType::getUnqual(Type::Int8Ty);
+ CastInst* BufPtr =
+ new BitCastInst(Inst->getOperand(1), SBPTy, "SBJmpBuf", Inst);
+ std::vector<Value*> Args =
+ make_vector<Value*>(GetSetJmpMap(Func), BufPtr,
+ ConstantInt::get(Type::Int32Ty,SetJmpIDMap[Func]++), 0);
+ CallInst::Create(AddSJToMap, Args.begin(), Args.end(), "", Inst);
// We are guaranteed that there are no values live across basic blocks
// (because we are "not in SSA form" yet), but there can still be values live
// This PHI node will be in the new block created from the
// splitBasicBlock call.
- PHINode* PHI = new PHINode(Type::IntTy, "SetJmpReturn", Inst);
+ PHINode* PHI = PHINode::Create(Type::Int32Ty, "SetJmpReturn", Inst);
// Coming from a call to setjmp, the return is 0.
- PHI->addIncoming(ConstantInt::getNullValue(Type::IntTy), ABlock);
+ PHI->addIncoming(Inst->getContext().getNullValue(Type::Int32Ty), ABlock);
// Add the case for this setjmp's number...
SwitchValuePair SVP = GetSJSwitch(Func, GetRethrowBB(Func));
- SVP.first->addCase(ConstantUInt::get(Type::UIntTy, SetJmpIDMap[Func] - 1),
+ SVP.first->addCase(ConstantInt::get(Type::Int32Ty, SetJmpIDMap[Func] - 1),
SetJmpContBlock);
// Value coming from the handling of the exception.
// Replace all uses of this instruction with the PHI node created by
// the eradication of setjmp.
Inst->replaceAllUsesWith(PHI);
- Inst->getParent()->getInstList().erase(Inst);
+ Inst->eraseFromParent();
++SetJmpsTransformed;
}
// Construct the new "invoke" instruction.
TerminatorInst* Term = OldBB->getTerminator();
std::vector<Value*> Params(CI.op_begin() + 1, CI.op_end());
- InvokeInst* II = new
- InvokeInst(CI.getCalledValue(), NewBB, PrelimBBMap[Func],
- Params, CI.getName(), Term);
+ InvokeInst* II =
+ InvokeInst::Create(CI.getCalledValue(), NewBB, PrelimBBMap[Func],
+ Params.begin(), Params.end(), CI.getName(), Term);
+ II->setCallingConv(CI.getCallingConv());
+ II->setAttributes(CI.getAttributes());
// Replace the old call inst with the invoke inst and remove the call.
CI.replaceAllUsesWith(II);
- CI.getParent()->getInstList().erase(&CI);
+ CI.eraseFromParent();
// The old terminator is useless now that we have the invoke inst.
- Term->getParent()->getInstList().erase(Term);
+ Term->eraseFromParent();
++CallsTransformed;
}
// If not reachable from a setjmp call, don't transform.
if (!DFSBlocks.count(BB)) return;
- BasicBlock* NormalBB = II.getNormalDest();
BasicBlock* ExceptBB = II.getUnwindDest();
Function* Func = BB->getParent();
- BasicBlock* NewExceptBB = new BasicBlock("InvokeExcept", Func);
- BasicBlock::InstListType& InstList = NewExceptBB->getInstList();
+ BasicBlock* NewExceptBB = BasicBlock::Create("InvokeExcept", Func);
// If this is a longjmp exception, then branch to the preliminary BB of
// the longjmp exception handling. Otherwise, go to the old exception.
- CallInst* IsLJExcept = new
- CallInst(IsLJException, std::vector<Value*>(), "IsLJExcept");
- InstList.push_back(IsLJExcept);
+ CallInst* IsLJExcept = CallInst::Create(IsLJException, "IsLJExcept",
+ NewExceptBB);
- new BranchInst(PrelimBBMap[Func], ExceptBB, IsLJExcept, NewExceptBB);
+ BranchInst::Create(PrelimBBMap[Func], ExceptBB, IsLJExcept, NewExceptBB);
II.setUnwindDest(NewExceptBB);
++InvokesTransformed;
// function.
void LowerSetJmp::visitReturnInst(ReturnInst &RI) {
Function* Func = RI.getParent()->getParent();
- new CallInst(DestroySJMap, make_vector<Value*>(GetSetJmpMap(Func), 0),
- "", &RI);
+ CallInst::Create(DestroySJMap, GetSetJmpMap(Func), "", &RI);
}
// visitUnwindInst - We want to destroy the setjmp map upon exit from the
// function.
void LowerSetJmp::visitUnwindInst(UnwindInst &UI) {
Function* Func = UI.getParent()->getParent();
- new CallInst(DestroySJMap, make_vector<Value*>(GetSetJmpMap(Func), 0),
- "", &UI);
+ CallInst::Create(DestroySJMap, GetSetJmpMap(Func), "", &UI);
}
ModulePass *llvm::createLowerSetJmpPass() {
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