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Add support for the --param ssp-buffer-size= driver option.

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PR9673

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162284 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier
2012-08-21 16:15:24 +00:00
parent 7996d04582
commit 35907e9862
4 changed files with 19 additions and 9 deletions
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12
lib/CodeGen/StackProtector.cpp
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@ -28,16 +28,10 @@
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/Triple.h"
using namespace llvm;
// SSPBufferSize - The lower bound for a buffer to be considered for stack
// smashing protection.
static cl::opt<unsigned>
SSPBufferSize("stack-protector-buffer-size", cl::init(8),
cl::desc("Lower bound for a buffer to be considered for "
"stack protection"));
namespace {
class StackProtector : public FunctionPass {
/// TLI - Keep a pointer of a TargetLowering to consult for determining
@ -111,8 +105,8 @@ bool StackProtector::runOnFunction(Function &Fn) {
bool StackProtector::ContainsProtectableArray(Type *Ty, bool InStruct) const {
if (!Ty) return false;
if (ArrayType *AT = dyn_cast<ArrayType>(Ty)) {
const TargetMachine &TM = TLI->getTargetMachine();
if (!AT->getElementType()->isIntegerTy(8)) {
const TargetMachine &TM = TLI->getTargetMachine();
Triple Trip(TM.getTargetTriple());
// If we're on a non-Darwin platform or we're inside of a structure, don't
@ -123,7 +117,7 @@ bool StackProtector::ContainsProtectableArray(Type *Ty, bool InStruct) const {
// If an array has more than SSPBufferSize bytes of allocated space, then we
// emit stack protectors.
if (SSPBufferSize <= TLI->getTargetData()->getTypeAllocSize(AT))
if (TM.Options.SSPBufferSize <= TLI->getTargetData()->getTypeAllocSize(AT))
return true;
}