================
@@ -184,13 +199,24 @@ llvm::MDNode *CodeGenTBAA::getTypeInfoHelper(const Type
*Ty) {
return getChar();
// Handle pointers and references.
- // TODO: Implement C++'s type "similarity" and consider dis-"similar"
- // pointers distinct.
- if (Ty->isPointerType() || Ty->isReferenceType())
- return createScalarTypeNode("any pointer", getChar(), Size);
+ // Pointer types never alias if their pointee type is distinct.
+ if ((Ty->isPointerType() || Ty->isReferenceType())) {
+ llvm::MDNode *AnyPtr = createScalarTypeNode("any pointer", getChar(),
Size);
+ if (!CodeGenOpts.PointerTBAA)
+ return AnyPtr;
+ unsigned PtrDepth = 0;
+ do {
+ PtrDepth++;
+ Ty = Ty->getPointeeType().getTypePtr();
+ } while (!Ty->getPointeeType().isNull());
----------------
rjmccall wrote:
`getPointeeType()` will look through a lot of types that you probably don't
want to look through, including member pointers. You should write this to
specifically look for pointers. (References can't occur in nested positions.)
https://github.com/llvm/llvm-project/pull/75177
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