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[unwind removal] We no longer have 'unwind' instructions being generated, so

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remove the code that handles them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149901 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2012-02-06 21:16:41 +00:00
parent 0f96817d01
commit aa5abe88d6
11 changed files with 9 additions and 134 deletions
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28
lib/Transforms/Utils/LowerInvoke.cpp
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@ -54,7 +54,6 @@
using namespace llvm;
STATISTIC(NumInvokes, "Number of invokes replaced");
STATISTIC(NumUnwinds, "Number of unwinds replaced");
STATISTIC(NumSpilled, "Number of registers live across unwind edges");
static cl::opt<bool> ExpensiveEHSupport("enable-correct-eh-support",
@ -193,20 +192,6 @@ bool LowerInvoke::insertCheapEHSupport(Function &F) {
BB->getInstList().erase(II);
++NumInvokes; Changed = true;
} else if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->getTerminator())) {
// Insert a call to abort()
CallInst::Create(AbortFn, "", UI)->setTailCall();
// Insert a return instruction. This really should be a "barrier", as it
// is unreachable.
ReturnInst::Create(F.getContext(),
F.getReturnType()->isVoidTy() ?
0 : Constant::getNullValue(F.getReturnType()), UI);
// Remove the unwind instruction now.
BB->getInstList().erase(UI);
++NumUnwinds; Changed = true;
}
return Changed;
}
@ -404,7 +389,6 @@ splitLiveRangesLiveAcrossInvokes(SmallVectorImpl<InvokeInst*> &Invokes) {
bool LowerInvoke::insertExpensiveEHSupport(Function &F) {
SmallVector<ReturnInst*,16> Returns;
SmallVector<UnwindInst*,16> Unwinds;
SmallVector<InvokeInst*,16> Invokes;
UnreachableInst* UnreachablePlaceholder = 0;
@ -415,14 +399,11 @@ bool LowerInvoke::insertExpensiveEHSupport(Function &F) {
Returns.push_back(RI);
} else if (InvokeInst *II = dyn_cast<InvokeInst>(BB->getTerminator())) {
Invokes.push_back(II);
} else if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->getTerminator())) {
Unwinds.push_back(UI);
}
if (Unwinds.empty() && Invokes.empty()) return false;
if (Invokes.empty()) return false;
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
@ -572,13 +553,6 @@ bool LowerInvoke::insertExpensiveEHSupport(Function &F) {
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();
}
// Replace the inserted unreachable with a branch to the unwind handler.
if (UnreachablePlaceholder) {
BranchInst::Create(UnwindHandler, UnreachablePlaceholder);