#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/Transforms/Utils/BasicBlockUtils.h"
const Type *JBLinkTy;
GlobalVariable *JBListHead;
Constant *SetJmpFn, *LongJmpFn;
-
+
// We peek in TLI to grab the target's jmp_buf size and alignment
const TargetLowering *TLI;
-
+
public:
static char ID; // Pass identification, replacement for typeid
explicit LowerInvoke(const TargetLowering *tli = NULL)
- : FunctionPass((intptr_t)&ID), TLI(tli) { }
+ : FunctionPass(&ID), TLI(tli) { }
bool doInitialization(Module &M);
bool runOnFunction(Function &F);
-
+
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
// This is a cluster of orthogonal Transforms
AU.addPreservedID(PromoteMemoryToRegisterID);
AU.addPreservedID(LowerSwitchID);
AU.addPreservedID(LowerAllocationsID);
}
-
+
private:
void createAbortMessage(Module *M);
void writeAbortMessage(Instruction *IB);
static RegisterPass<LowerInvoke>
X("lowerinvoke", "Lower invoke and unwind, for unwindless code generators");
-const PassInfo *llvm::LowerInvokePassID = X.getPassInfo();
+const PassInfo *const llvm::LowerInvokePassID = &X;
// Public Interface To the LowerInvoke pass.
-FunctionPass *llvm::createLowerInvokePass(const TargetLowering *TLI) {
- return new LowerInvoke(TLI);
+FunctionPass *llvm::createLowerInvokePass(const TargetLowering *TLI) {
+ return new LowerInvoke(TLI);
}
// doInitialization - Make sure that there is a prototype for abort in the
// current module.
bool LowerInvoke::doInitialization(Module &M) {
+ LLVMContext &Context = M.getContext();
+
const Type *VoidPtrTy = PointerType::getUnqual(Type::Int8Ty);
AbortMessage = 0;
if (ExpensiveEHSupport) {
// Now that we've done that, insert the jmpbuf list head global, unless it
// already exists.
if (!(JBListHead = M.getGlobalVariable("llvm.sjljeh.jblist", PtrJBList))) {
- JBListHead = new GlobalVariable(PtrJBList, false,
- GlobalValue::LinkOnceLinkage,
- Constant::getNullValue(PtrJBList),
- "llvm.sjljeh.jblist", &M);
+ JBListHead = new GlobalVariable(M, PtrJBList, false,
+ GlobalValue::LinkOnceAnyLinkage,
+ Context.getNullValue(PtrJBList),
+ "llvm.sjljeh.jblist");
}
-// VisualStudio defines setjmp as _setjmp via #include <csetjmp> / <setjmp.h>,
+// VisualStudio defines setjmp as _setjmp via #include <csetjmp> / <setjmp.h>,
// so it looks like Intrinsic::_setjmp
#if defined(_MSC_VER) && defined(setjmp)
#define setjmp_undefined_for_visual_studio
SetJmpFn = Intrinsic::getDeclaration(&M, Intrinsic::setjmp);
#if defined(_MSC_VER) && defined(setjmp_undefined_for_visual_studio)
-// let's return it to _setjmp state in case anyone ever needs it after this
+// let's return it to _setjmp state in case anyone ever needs it after this
// point under VisualStudio
-#define setjmp _setjmp
+#define setjmp _setjmp
#endif
LongJmpFn = Intrinsic::getDeclaration(&M, Intrinsic::longjmp);
}
void LowerInvoke::createAbortMessage(Module *M) {
+ LLVMContext &Context = M->getContext();
+
if (ExpensiveEHSupport) {
// The abort message for expensive EH support tells the user that the
// program 'unwound' without an 'invoke' instruction.
ConstantArray::get("ERROR: Exception thrown, but not caught!\n");
AbortMessageLength = Msg->getNumOperands()-1; // don't include \0
- GlobalVariable *MsgGV = new GlobalVariable(Msg->getType(), true,
+ GlobalVariable *MsgGV = new GlobalVariable(*M, Msg->getType(), true,
GlobalValue::InternalLinkage,
- Msg, "abortmsg", M);
- std::vector<Constant*> GEPIdx(2, Constant::getNullValue(Type::Int32Ty));
+ Msg, "abortmsg");
+ std::vector<Constant*> GEPIdx(2, Context.getNullValue(Type::Int32Ty));
AbortMessage = ConstantExpr::getGetElementPtr(MsgGV, &GEPIdx[0], 2);
} else {
// The abort message for cheap EH support tells the user that EH is not
// enabled.
Constant *Msg =
- ConstantArray::get("Exception handler needed, but not enabled. Recompile"
- " program with -enable-correct-eh-support.\n");
+ ConstantArray::get("Exception handler needed, but not enabled."
+ "Recompile program with -enable-correct-eh-support.\n");
AbortMessageLength = Msg->getNumOperands()-1; // don't include \0
- GlobalVariable *MsgGV = new GlobalVariable(Msg->getType(), true,
+ GlobalVariable *MsgGV = new GlobalVariable(*M, Msg->getType(), true,
GlobalValue::InternalLinkage,
- Msg, "abortmsg", M);
- std::vector<Constant*> GEPIdx(2, Constant::getNullValue(Type::Int32Ty));
+ Msg, "abortmsg");
+ std::vector<Constant*> GEPIdx(2, Context.getNullValue(Type::Int32Ty));
AbortMessage = ConstantExpr::getGetElementPtr(MsgGV, &GEPIdx[0], 2);
}
}
}
bool LowerInvoke::insertCheapEHSupport(Function &F) {
+ LLVMContext &Context = F.getContext();
bool Changed = false;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator())) {
CallArgs.begin(), CallArgs.end(), "",II);
NewCall->takeName(II);
NewCall->setCallingConv(II->getCallingConv());
- NewCall->setParamAttrs(II->getParamAttrs());
+ NewCall->setAttributes(II->getAttributes());
II->replaceAllUsesWith(NewCall);
// Insert an unconditional branch to the normal destination.
// Insert a return instruction. This really should be a "barrier", as it
// is unreachable.
ReturnInst::Create(F.getReturnType() == Type::VoidTy ? 0 :
- Constant::getNullValue(F.getReturnType()), UI);
+ Context.getNullValue(F.getReturnType()), UI);
// Remove the unwind instruction now.
BB->getInstList().erase(UI);
void LowerInvoke::rewriteExpensiveInvoke(InvokeInst *II, unsigned InvokeNo,
AllocaInst *InvokeNum,
SwitchInst *CatchSwitch) {
+ LLVMContext &Context = II->getContext();
ConstantInt *InvokeNoC = ConstantInt::get(Type::Int32Ty, InvokeNo);
// If the unwind edge has phi nodes, split the edge.
if (isa<PHINode>(II->getUnwindDest()->begin())) {
SplitCriticalEdge(II, 1, this);
-
+
// If there are any phi nodes left, they must have a single predecessor.
while (PHINode *PN = dyn_cast<PHINode>(II->getUnwindDest()->begin())) {
PN->replaceAllUsesWith(PN->getIncomingValue(0));
PN->eraseFromParent();
}
}
-
+
// Insert a store of the invoke num before the invoke and store zero into the
// location afterward.
new StoreInst(InvokeNoC, InvokeNum, true, II); // volatile
-
- BasicBlock::iterator NI = II->getNormalDest()->begin();
- while (isa<PHINode>(NI)) ++NI;
+
+ BasicBlock::iterator NI = II->getNormalDest()->getFirstNonPHI();
// nonvolatile.
- new StoreInst(Constant::getNullValue(Type::Int32Ty), InvokeNum, false, NI);
-
+ new StoreInst(Context.getNullValue(Type::Int32Ty), InvokeNum, false, NI);
+
// Add a switch case to our unwind block.
CatchSwitch->addCase(InvokeNoC, II->getUnwindDest());
-
+
// Insert a normal call instruction.
std::vector<Value*> CallArgs(II->op_begin()+3, II->op_end());
CallInst *NewCall = CallInst::Create(II->getCalledValue(),
II);
NewCall->takeName(II);
NewCall->setCallingConv(II->getCallingConv());
- NewCall->setParamAttrs(II->getParamAttrs());
+ NewCall->setAttributes(II->getAttributes());
II->replaceAllUsesWith(NewCall);
-
+
// Replace the invoke with an uncond branch.
BranchInst::Create(II->getNormalDest(), NewCall->getParent());
II->eraseFromParent();
/// we reach blocks we've already seen.
static void MarkBlocksLiveIn(BasicBlock *BB, std::set<BasicBlock*> &LiveBBs) {
if (!LiveBBs.insert(BB).second) return; // already been here.
-
+
for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
- MarkBlocksLiveIn(*PI, LiveBBs);
+ MarkBlocksLiveIn(*PI, LiveBBs);
}
// First thing we need to do is scan the whole function for values that are
}
Function *F = Invokes.back()->getParent()->getParent();
-
+
// To avoid having to handle incoming arguments specially, we lower each arg
// to a copy instruction in the entry block. This ensures that the argument
// value itself cannot be live across the entry block.
// could cause the opcode to reflect an illegal conversion. However, we're
// replacing it here with the same value it was constructed with to simply
// make NC its user.
- NC->setOperand(0, AI);
+ NC->setOperand(0, AI);
}
-
+
// Finally, scan the code looking for instructions with bad live ranges.
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E; ++II) {
if (Inst->hasOneUse() &&
cast<Instruction>(Inst->use_back())->getParent() == BB &&
!isa<PHINode>(Inst->use_back())) continue;
-
+
// If this is an alloca in the entry block, it's not a real register
// value.
if (AllocaInst *AI = dyn_cast<AllocaInst>(Inst))
if (isa<ConstantInt>(AI->getArraySize()) && BB == F->begin())
continue;
-
+
// Avoid iterator invalidation by copying users to a temporary vector.
std::vector<Instruction*> Users;
for (Value::use_iterator UI = Inst->use_begin(), E = Inst->use_end();
while (!Users.empty()) {
Instruction *U = Users.back();
Users.pop_back();
-
+
if (!isa<PHINode>(U)) {
MarkBlocksLiveIn(U->getParent(), LiveBBs);
} else {
MarkBlocksLiveIn(PN->getIncomingBlock(i), LiveBBs);
}
}
-
+
// Now that we know all of the blocks that this thing is live in, see if
// it includes any of the unwind locations.
bool NeedsSpill = false;
std::vector<UnwindInst*> Unwinds;
std::vector<InvokeInst*> Invokes;
+ LLVMContext &Context = F.getContext();
+
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
if (ReturnInst *RI = dyn_cast<ReturnInst>(BB->getTerminator())) {
// Remember all return instructions in case we insert an invoke into this
NumInvokes += Invokes.size();
NumUnwinds += Unwinds.size();
-
+
// TODO: This is not an optimal way to do this. In particular, this always
// inserts setjmp calls into the entries of functions with invoke instructions
// even though there are possibly paths through the function that do not
// we spill into a stack location, guaranteeing that there is nothing live
// across the unwind edge. This process also splits all critical edges
// coming out of invoke's.
- splitLiveRangesLiveAcrossInvokes(Invokes);
-
+ splitLiveRangesLiveAcrossInvokes(Invokes);
+
BasicBlock *EntryBB = F.begin();
-
+
// Create an alloca for the incoming jump buffer ptr and the new jump buffer
// that needs to be restored on all exits from the function. This is an
// alloca because the value needs to be live across invokes.
unsigned Align = TLI ? TLI->getJumpBufAlignment() : 0;
- AllocaInst *JmpBuf =
- new AllocaInst(JBLinkTy, 0, Align, "jblink", F.begin()->begin());
-
+ AllocaInst *JmpBuf =
+ new AllocaInst(JBLinkTy, 0, Align,
+ "jblink", F.begin()->begin());
+
std::vector<Value*> Idx;
- Idx.push_back(Constant::getNullValue(Type::Int32Ty));
+ Idx.push_back(Context.getNullValue(Type::Int32Ty));
Idx.push_back(ConstantInt::get(Type::Int32Ty, 1));
OldJmpBufPtr = GetElementPtrInst::Create(JmpBuf, Idx.begin(), Idx.end(),
- "OldBuf", EntryBB->getTerminator());
+ "OldBuf",
+ EntryBB->getTerminator());
// Copy the JBListHead to the alloca.
Value *OldBuf = new LoadInst(JBListHead, "oldjmpbufptr", true,
EntryBB->getTerminator());
new StoreInst(OldBuf, OldJmpBufPtr, true, EntryBB->getTerminator());
-
+
// Add the new jumpbuf to the list.
new StoreInst(JmpBuf, JBListHead, true, EntryBB->getTerminator());
// Create the catch block. The catch block is basically a big switch
// statement that goes to all of the invoke catch blocks.
BasicBlock *CatchBB = BasicBlock::Create("setjmp.catch", &F);
-
+
// Create an alloca which keeps track of which invoke is currently
// executing. For normal calls it contains zero.
- AllocaInst *InvokeNum = new AllocaInst(Type::Int32Ty, 0, "invokenum",
- EntryBB->begin());
+ AllocaInst *InvokeNum = new AllocaInst(Type::Int32Ty, 0,
+ "invokenum",EntryBB->begin());
new StoreInst(ConstantInt::get(Type::Int32Ty, 0), InvokeNum, true,
EntryBB->getTerminator());
-
+
// Insert a load in the Catch block, and a switch on its value. By default,
// we go to a block that just does an unwind (which is the correct action
// for a standard call).
BasicBlock *UnwindBB = BasicBlock::Create("unwindbb", &F);
Unwinds.push_back(new UnwindInst(UnwindBB));
-
+
Value *CatchLoad = new LoadInst(InvokeNum, "invoke.num", true, CatchBB);
SwitchInst *CatchSwitch =
SwitchInst::Create(CatchLoad, UnwindBB, Invokes.size(), CatchBB);
// Now that things are set up, insert the setjmp call itself.
-
+
// Split the entry block to insert the conditional branch for the setjmp.
BasicBlock *ContBlock = EntryBB->splitBasicBlock(EntryBB->getTerminator(),
"setjmp.cont");
EntryBB->getTerminator());
// Compare the return value to zero.
- Value *IsNormal = new ICmpInst(ICmpInst::ICMP_EQ, SJRet,
- Constant::getNullValue(SJRet->getType()),
- "notunwind", EntryBB->getTerminator());
+ Value *IsNormal = new ICmpInst(EntryBB->getTerminator(),
+ ICmpInst::ICMP_EQ, SJRet,
+ Context.getNullValue(SJRet->getType()),
+ "notunwind");
// Nuke the uncond branch.
EntryBB->getTerminator()->eraseFromParent();
-
+
// Put in a new condbranch in its place.
BranchInst::Create(ContBlock, CatchBB, IsNormal, EntryBB);
}
// We know that there is at least one unwind.
-
+
// Create three new blocks, the block to load the jmpbuf ptr and compare
// against null, the block to do the longjmp, and the error block for if it
// is null. Add them at the end of the function because they are not hot.
} else {
BufPtr = new LoadInst(JBListHead, "ehlist", UnwindHandler);
}
-
+
// Load the JBList, if it's null, then there was no catch!
- Value *NotNull = new ICmpInst(ICmpInst::ICMP_NE, BufPtr,
- Constant::getNullValue(BufPtr->getType()),
- "notnull", UnwindHandler);
+ Value *NotNull = new ICmpInst(*UnwindHandler, ICmpInst::ICMP_NE, BufPtr,
+ Context.getNullValue(BufPtr->getType()),
+ "notnull");
BranchInst::Create(UnwindBlock, TermBlock, NotNull, UnwindHandler);
-
+
// Create the block to do the longjmp.
// Get a pointer to the jmpbuf and longjmp.
std::vector<Value*> Idx;
- Idx.push_back(Constant::getNullValue(Type::Int32Ty));
+ Idx.push_back(Context.getNullValue(Type::Int32Ty));
Idx.push_back(ConstantInt::get(Type::Int32Ty, 0));
Idx[0] = GetElementPtrInst::Create(BufPtr, Idx.begin(), Idx.end(), "JmpBuf",
UnwindBlock);
Idx[1] = ConstantInt::get(Type::Int32Ty, 1);
CallInst::Create(LongJmpFn, Idx.begin(), Idx.end(), "", UnwindBlock);
new UnreachableInst(UnwindBlock);
-
+
// Set up the term block ("throw without a catch").
new UnreachableInst(TermBlock);
// Insert a new call to write(2, AbortMessage, AbortMessageLength);
writeAbortMessage(TermBlock->getTerminator());
-
+
// Insert a call to abort()
CallInst::Create(AbortFn, "",
TermBlock->getTerminator())->setTailCall();
-
-
+
+
// Replace all unwinds with a branch to the unwind handler.
for (unsigned i = 0, e = Unwinds.size(); i != e; ++i) {
BranchInst::Create(UnwindHandler, Unwinds[i]);
- Unwinds[i]->eraseFromParent();
- }
-
+ Unwinds[i]->eraseFromParent();
+ }
+
// Finally, for any returns from this function, if this function contains an
// invoke, restore the old jmpbuf pointer to its input value.
if (OldJmpBufPtr) {
for (unsigned i = 0, e = Returns.size(); i != e; ++i) {
ReturnInst *R = Returns[i];
-
+
// Before the return, insert a copy from the saved value to the new value.
Value *OldBuf = new LoadInst(OldJmpBufPtr, "oldjmpbufptr", true, R);
new StoreInst(OldBuf, JBListHead, true, R);
}
}
-
+
return true;
}
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