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Fix crashes and infinite loops. 

llvm-svn: 57408
This commit is contained in:
Owen Anderson 2008-10-12 06:03:38 +00:00
parent b6aa53b7de
commit 198966dbef
1 changed files with 14 additions and 12 deletions
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26
llvm/lib/Analysis/EscapeAnalysis.cpp
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@ -48,6 +48,7 @@ bool EscapeAnalysis::runOnFunction(Function& F) {
bool inserted = false;
for (Function::arg_iterator AI = F.arg_begin(), AE = F.arg_end();
AI != AE; ++AI) {
if (!isa<PointerType>(AI->getType())) continue;
AliasAnalysis::AliasResult R = AA.alias(Pointer, StoreSize, AI, ~0UL);
if (R != AliasAnalysis::NoAlias) {
EscapePoints.insert(S);
@ -102,26 +103,27 @@ bool EscapeAnalysis::escapes(AllocationInst* A) {
worklist.push_back(A);
SmallPtrSet<Instruction*, 8> visited;
visited.insert(A);
while (!worklist.empty()) {
Instruction* curr = worklist.back();
worklist.pop_back();
visited.insert(curr);
if (EscapePoints.count(curr))
return true;
for (Instruction::use_iterator UI = curr->use_begin(), UE = curr->use_end();
UI != UE; ++UI)
if (Instruction* U = dyn_cast<Instruction>(UI))
if (!visited.count(U))
if (StoreInst* S = dyn_cast<StoreInst>(U)) {
// We know this must be an instruction, because constant gep's would
// have been found to alias a global, so stores to them would have
// been in EscapePoints.
worklist.push_back(cast<Instruction>(S->getPointerOperand()));
} else
if (StoreInst* S = dyn_cast<StoreInst>(curr)) {
// We know this must be an instruction, because constant gep's would
// have been found to alias a global, so stores to them would have
// been in EscapePoints.
if (visited.insert(cast<Instruction>(S->getPointerOperand())))
worklist.push_back(cast<Instruction>(S->getPointerOperand()));
} else {
for (Instruction::use_iterator UI = curr->use_begin(),
UE = curr->use_end(); UI != UE; ++UI)
if (Instruction* U = dyn_cast<Instruction>(UI))
if (visited.insert(U))
worklist.push_back(U);
}
}
return false;