TBAA: add isTBAAVtableAccess to MDNode so clients can call the function
instead of having its own implementation.
The implementation of isTBAAVtableAccess is in TypeBasedAliasAnalysis.cpp
since it is related to the format of TBAA metadata.
The path for struct-path tbaa will be exercised by
test/Instrumentation/ThreadSanitizer/read_from_global.ll, vptr_read.ll, and
vptr_update.ll when struct-path tbaa is on by default.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190216 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Instrumentation/ThreadSanitizer.cpp b/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
index e19ceba..2c8a7c4 100644
--- a/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
+++ b/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
@@ -240,12 +240,8 @@
}
static bool isVtableAccess(Instruction *I) {
- if (MDNode *Tag = I->getMetadata(LLVMContext::MD_tbaa)) {
- if (Tag->getNumOperands() < 1) return false;
- if (MDString *Tag1 = dyn_cast<MDString>(Tag->getOperand(0))) {
- if (Tag1->getString() == "vtable pointer") return true;
- }
- }
+ if (MDNode *Tag = I->getMetadata(LLVMContext::MD_tbaa))
+ return Tag->isTBAAVtableAccess();
return false;
}