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Don't try to add stack protector logic to a dead basic block. It messes up

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dominator information.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128452 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-03-29 05:15:48 +00:00
parent 0f41587909
commit ad7d8a598b
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/StackProtector.cpp
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@ -150,9 +150,11 @@ bool StackProtector::InsertStackProtectors() {
BasicBlock *FailBBDom = 0; // FailBB's dominator.
AllocaInst *AI = 0; // Place on stack that stores the stack guard.
Value *StackGuardVar = 0; // The stack guard variable.
BasicBlock &Entry = F->getEntryBlock();
for (Function::iterator I = F->begin(), E = F->end(); I != E; ) {
BasicBlock *BB = I++;
if (BB->getNumUses() == 0 && BB != &Entry) continue;
ReturnInst *RI = dyn_cast<ReturnInst>(BB->getTerminator());
if (!RI) continue;
@ -178,7 +180,6 @@ bool StackProtector::InsertStackProtectors() {
StackGuardVar = M->getOrInsertGlobal("__stack_chk_guard", PtrTy);
}
BasicBlock &Entry = F->getEntryBlock();
Instruction *InsPt = &Entry.front();
AI = new AllocaInst(PtrTy, "StackGuardSlot", InsPt);