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Simplify code a bit, and be sure to mark the external node as potentially throwing
llvm-svn: 12856
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43f754339a
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@ -51,43 +51,43 @@ bool PruneEH::runOnSCC(const std::vector<CallGraphNode *> &SCC) {
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// obviously the SCC might throw.
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//
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bool SCCMightThrow = false;
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for (unsigned i = 0, e = SCC.size(); !SCCMightThrow && i != e; ++i)
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if (Function *F = SCC[i]->getFunction())
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if (F->isExternal() && !F->getIntrinsicID()) {
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SCCMightThrow = true;
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} else {
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// Check to see if this function performs an unwind or calls an
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// unwinding function.
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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if (isa<UnwindInst>(BB->getTerminator())) { // Uses unwind!
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SCCMightThrow = true;
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break;
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}
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for (unsigned i = 0, e = SCC.size(); !SCCMightThrow && i != e; ++i) {
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Function *F = SCC[i]->getFunction();
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if (F == 0 || (F->isExternal() && !F->getIntrinsicID())) {
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SCCMightThrow = true;
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} else {
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// Check to see if this function performs an unwind or calls an
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// unwinding function.
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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if (isa<UnwindInst>(BB->getTerminator())) { // Uses unwind!
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SCCMightThrow = true;
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break;
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}
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// Invoke instructions don't allow unwinding to continue, so we are
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// only interested in call instructions.
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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if (CallInst *CI = dyn_cast<CallInst>(I)) {
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if (Function *Callee = CI->getCalledFunction()) {
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CallGraphNode *CalleeNode = CG[Callee];
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// If the callee is outside our current SCC, or if it is not
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// known to throw, then we might throw also.
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if (std::find(SCC.begin(), SCC.end(), CalleeNode) == SCC.end()&&
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!DoesNotThrow.count(CalleeNode)) {
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SCCMightThrow = true;
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break;
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}
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} else {
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// Indirect call, it might throw.
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// Invoke instructions don't allow unwinding to continue, so we are
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// only interested in call instructions.
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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if (CallInst *CI = dyn_cast<CallInst>(I)) {
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if (Function *Callee = CI->getCalledFunction()) {
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CallGraphNode *CalleeNode = CG[Callee];
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// If the callee is outside our current SCC, or if it is not
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// known to throw, then we might throw also.
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if (std::find(SCC.begin(), SCC.end(), CalleeNode) == SCC.end()&&
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!DoesNotThrow.count(CalleeNode)) {
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SCCMightThrow = true;
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break;
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}
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} else {
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// Indirect call, it might throw.
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SCCMightThrow = true;
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break;
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}
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if (SCCMightThrow) break;
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}
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}
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if (SCCMightThrow) break;
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}
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}
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}
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bool MadeChange = false;
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for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
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