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TBAA: add isTBAAVtableAccess to MDNode so clients can call the function

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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
This commit is contained in:
Manman Ren
2013-09-06 22:47:05 +00:00
parent 1307103dff
commit 0b3d39235a
3 changed files with 24 additions and 6 deletions
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8
lib/Transforms/Instrumentation/ThreadSanitizer.cpp
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@ -240,12 +240,8 @@ bool ThreadSanitizer::doInitialization(Module &M) {
}
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;
}