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[asan] add experimental -asan-realign-stack option (true by default, which does not change the current behavior) 

llvm-svn: 169216
This commit is contained in:
Kostya Serebryany 2012-12-04 06:14:01 +00:00
parent 36ed3024ed
commit 9b65726d24
1 changed files with 7 additions and 2 deletions
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9
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -115,6 +115,8 @@ static cl::opt<bool> ClInitializers("asan-initialization-order",
cl::desc("Handle C++ initializer order"), cl::Hidden, cl::init(false));
static cl::opt<bool> ClMemIntrin("asan-memintrin",
cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true));
static cl::opt<bool> ClRealignStack("asan-realign-stack",
cl::desc("Realign stack to 32"), cl::Hidden, cl::init(true));
static cl::opt<std::string> ClBlacklistFile("asan-blacklist",
cl::desc("File containing the list of objects to ignore "
"during instrumentation"), cl::Hidden);
@ -1159,6 +1161,7 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
// Filter out Alloca instructions we want (and can) handle.
// Collect Ret instructions.
unsigned ResultAlignment = 1 << MappingScale();
for (Function::iterator FI = F.begin(), FE = F.end();
FI != FE; ++FI) {
BasicBlock &BB = *FI;
@ -1174,7 +1177,7 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
if (AI->isArrayAllocation()) continue;
if (!AI->isStaticAlloca()) continue;
if (!AI->getAllocatedType()->isSized()) continue;
if (AI->getAlignment() > RedzoneSize()) continue;
ResultAlignment = std::max(ResultAlignment, AI->getAlignment());
AllocaVec.push_back(AI);
uint64_t AlignedSize = getAlignedAllocaSize(AI);
TotalSize += AlignedSize;
@ -1195,7 +1198,9 @@ bool AddressSanitizer::poisonStackInFunction(Function &F) {
Type *ByteArrayTy = ArrayType::get(IRB.getInt8Ty(), LocalStackSize);
AllocaInst *MyAlloca =
new AllocaInst(ByteArrayTy, "MyAlloca", InsBefore);
MyAlloca->setAlignment(RedzoneSize());
if (ClRealignStack && ResultAlignment < RedzoneSize())
ResultAlignment = RedzoneSize();
MyAlloca->setAlignment(ResultAlignment);
assert(MyAlloca->isStaticAlloca());
Value *OrigStackBase = IRB.CreatePointerCast(MyAlloca, IntptrTy);
Value *LocalStackBase = OrigStackBase;