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Adjust the stack protector heuristic to care about only arrays or calls to

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"alloca".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58792 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-11-06 02:38:58 +00:00
parent b2a4298ce4
commit 89c5cc6c79
1 changed files with 9 additions and 1 deletions
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10
lib/CodeGen/StackProtector.cpp
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@ -184,7 +184,9 @@ BasicBlock *StackProtector::CreateFailBB() {
}
/// RequiresStackProtector - Check whether or not this function needs a stack
/// protector based upon the stack protector level.
/// protector based upon the stack protector level. The heuristic we use is to
/// add a guard variable to functions that call alloca, and functions with
/// buffers larger than 8 bytes.
bool StackProtector::RequiresStackProtector() const {
switch (Level) {
default: return false;
@ -201,6 +203,8 @@ bool StackProtector::RequiresStackProtector() const {
for (BasicBlock::iterator
II = BB->begin(), IE = BB->end(); II != IE; ++II)
if (AllocaInst *AI = dyn_cast<AllocaInst>(II)) {
if (!AI->isArrayAllocation()) continue; // Only care about arrays.
if (ConstantInt *CI = dyn_cast<ConstantInt>(AI->getArraySize())) {
const Type *Ty = AI->getAllocatedType();
uint64_t TySize = TD->getABITypeSize(Ty);
@ -208,6 +212,10 @@ bool StackProtector::RequiresStackProtector() const {
if (SSPBufferSize <= StackSize)
return true;
} else {
// This is a call to alloca with a variable size. Default to adding
// stack protectors.
return true;
}
}
}