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",
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;
}
bool LowerInvoke::insertExpensiveEHSupport(Function &F) {
SmallVector<ReturnInst*,16> Returns;
- SmallVector<UnwindInst*,16> Unwinds;
SmallVector<InvokeInst*,16> Invokes;
UnreachableInst* UnreachablePlaceholder = 0;
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
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);