// b) collect usage statistics to help improve Clang coverage design.
bool AddressSanitizer::InjectCoverage(Function &F) {
if (!ClCoverage) return false;
- IRBuilder<> IRB(F.getEntryBlock().getFirstInsertionPt());
+
+ // Skip static allocas at the top of the entry block so they don't become
+ // dynamic when we split the block. If we used our optimized stack layout,
+ // then there will only be one alloca and it will come first.
+ BasicBlock &Entry = F.getEntryBlock();
+ BasicBlock::iterator IP = Entry.getFirstInsertionPt(), BE = Entry.end();
+ for (; IP != BE; ++IP) {
+ AllocaInst *AI = dyn_cast<AllocaInst>(IP);
+ if (!AI || !AI->isStaticAlloca())
+ break;
+ }
+
+ IRBuilder<> IRB(IP);
Type *Int8Ty = IRB.getInt8Ty();
GlobalVariable *Guard = new GlobalVariable(
*F.getParent(), Int8Ty, false, GlobalValue::PrivateLinkage,