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Don't mark a call as potentially throwing if the function it's calling has the

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"nounwind" attribute.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86897 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-11-11 23:17:02 +00:00
parent 9089ba8e5e
commit 73b5551058
1 changed files with 21 additions and 1 deletions
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22
lib/CodeGen/AsmPrinter/DwarfException.cpp
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@ -490,7 +490,27 @@ ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
MI != E; ++MI) {
if (!MI->isLabel()) {
SawPotentiallyThrowing |= MI->getDesc().isCall();
if (MI->getDesc().isCall()) {
// Don't mark a call as potentially throwing if the function it's
// calling is marked "nounwind".
bool DoesNotThrow = false;
for (unsigned OI = 0, OE = MI->getNumOperands(); OI != OE; ++OI) {
const MachineOperand &MO = MI->getOperand(OI);
if (MO.isGlobal()) {
if (Function *F = dyn_cast<Function>(MO.getGlobal())) {
if (F->doesNotThrow()) {
DoesNotThrow = true;
break;
}
}
}
}
if (!DoesNotThrow)
SawPotentiallyThrowing = true;
}
continue;
}