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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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19
lib/Analysis/TypeBasedAliasAnalysis.cpp
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@ -458,6 +458,25 @@ TypeBasedAliasAnalysis::getModRefInfo(ImmutableCallSite CS1,
return AliasAnalysis::getModRefInfo(CS1, CS2);
}
bool MDNode::isTBAAVtableAccess() const {
if (!EnableStructPathTBAA) {
if (getNumOperands() < 1) return false;
if (MDString *Tag1 = dyn_cast<MDString>(getOperand(0))) {
if (Tag1->getString() == "vtable pointer") return true;
}
return false;
}
// For struct-path aware TBAA, we use the access type of the tag.
if (getNumOperands() < 2) return false;
MDNode *Tag = cast_or_null<MDNode>(getOperand(1));
if (!Tag) return false;
if (MDString *Tag1 = dyn_cast<MDString>(Tag->getOperand(0))) {
if (Tag1->getString() == "vtable pointer") return true;
}
return false;
}
MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) {
if (!A || !B)
return NULL;