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Minor cleanups, give credit, remove code that should not be necessary, and

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was a "major hack"  :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8524 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-09-15 05:43:05 +00:00
parent 41de073b04
commit 77b398cd5f
1 changed files with 5 additions and 28 deletions
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33
lib/Transforms/IPO/LowerSetJmp.cpp
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@ -1,7 +1,7 @@
//===- LowerSetJmp.cpp - Code pertaining to lowering set/long jumps -------===//
//
// This file implements the lowering of setjmp and longjmp to use the
// LLVM invoke instruction as necessary.
// LLVM invoke and unwind instructions as necessary.
//
// Lowering of longjmp is fairly trivial. We replace the call with a
// call to the LLVM library function "__llvm_sjljeh_throw_longjmp()".
@ -17,6 +17,8 @@
// original except block being executed if it isn't a longjmp except
// that is handled by that function.
//
// This pass was contributed to LLVM by Bill Wendling.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
@ -218,10 +220,8 @@ bool LowerSetJmp::IsTransformableFunction(const std::string& Name)
{
std::string SJLJEh("__llvm_sjljeh");
if (Name.size() > SJLJEh.size()) {
std::string N(Name.begin(), Name.begin() + SJLJEh.size());
return N != SJLJEh;
}
if (Name.size() > SJLJEh.size())
return std::string(Name.begin(), Name.begin() + SJLJEh.size()) != SJLJEh;
return true;
}
@ -354,29 +354,6 @@ void LowerSetJmp::TransformSetJmpCall(CallInst* Inst)
SetJmpIDMap[Func]++), 0),
"", Inst);
// FIXME: This is a nasty piece of code. We want the jump buffer to
// dominate all uses. However, we're doing unnatural things to the CFG
// which cause this dominance to be lost. The only way to guarantee we
// get it back is to place where the jump buffer is being allocated
// into the entry block. That's what this code does. The alloca for the
// jump buffer is followed by a getelementptr call.
if (GetElementPtrInst* GEP = dyn_cast<GetElementPtrInst>(Inst->getOperand(1)))
if (GEP->use_size() > 1) {
if (AllocaInst* AI = dyn_cast<AllocaInst>(GEP->getPointerOperand())) {
BasicBlock& Entry = Func->getEntryNode();
BasicBlock::InstListType& EntryIL = Entry.getInstList();
Instruction* NewAI = AI->clone();
Instruction* NewGEP = GEP->clone();
NewAI->setName(AI->getName());
NewGEP->setName(GEP->getName());
EntryIL.push_front(NewGEP);
EntryIL.push_front(NewAI);
GEP->replaceAllUsesWith(NewGEP);
AI->replaceAllUsesWith(NewAI);
}
}
// Change the setjmp call into a branch statement. We'll remove the
// setjmp call in a little bit. No worries.
BasicBlock* SetJmpContBlock = ABlock->splitBasicBlock(Inst);