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Simplify code a bit, and be sure to mark the external node as potentially throwing

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12856 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-04-12 04:06:38 +00:00
parent 133dbb1285
commit d08ddd3300
1 changed files with 31 additions and 31 deletions
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62
lib/Transforms/IPO/PruneEH.cpp
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@ -51,43 +51,43 @@ bool PruneEH::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
// obviously the SCC might throw. // obviously the SCC might throw.
// //
bool SCCMightThrow = false; bool SCCMightThrow = false;
for (unsigned i = 0, e = SCC.size(); !SCCMightThrow && i != e; ++i) for (unsigned i = 0, e = SCC.size(); !SCCMightThrow && i != e; ++i) {
if (Function *F = SCC[i]->getFunction()) Function *F = SCC[i]->getFunction();
if (F->isExternal() && !F->getIntrinsicID()) { if (F == 0 || (F->isExternal() && !F->getIntrinsicID())) {
SCCMightThrow = true; SCCMightThrow = true;
} else { } else {
// Check to see if this function performs an unwind or calls an // Check to see if this function performs an unwind or calls an
// unwinding function. // unwinding function.
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) { for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
if (isa<UnwindInst>(BB->getTerminator())) { // Uses unwind! if (isa<UnwindInst>(BB->getTerminator())) { // Uses unwind!
SCCMightThrow = true; SCCMightThrow = true;
break; break;
} }
// Invoke instructions don't allow unwinding to continue, so we are // Invoke instructions don't allow unwinding to continue, so we are
// only interested in call instructions. // only interested in call instructions.
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (CallInst *CI = dyn_cast<CallInst>(I)) { if (CallInst *CI = dyn_cast<CallInst>(I)) {
if (Function *Callee = CI->getCalledFunction()) { if (Function *Callee = CI->getCalledFunction()) {
CallGraphNode *CalleeNode = CG[Callee]; CallGraphNode *CalleeNode = CG[Callee];
// If the callee is outside our current SCC, or if it is not // If the callee is outside our current SCC, or if it is not
// known to throw, then we might throw also. // known to throw, then we might throw also.
if (std::find(SCC.begin(), SCC.end(), CalleeNode) == SCC.end()&& if (std::find(SCC.begin(), SCC.end(), CalleeNode) == SCC.end()&&
!DoesNotThrow.count(CalleeNode)) { !DoesNotThrow.count(CalleeNode)) {
SCCMightThrow = true;
break;
}
} else {
// Indirect call, it might throw.
SCCMightThrow = true; SCCMightThrow = true;
break; break;
} }
} else {
// Indirect call, it might throw.
SCCMightThrow = true;
break;
} }
if (SCCMightThrow) break; }
} if (SCCMightThrow) break;
} }
}
}
bool MadeChange = false; bool MadeChange = false;
for (unsigned i = 0, e = SCC.size(); i != e; ++i) { for (unsigned i = 0, e = SCC.size(); i != e; ++i) {