rsmith added inline comments.
================
Comment at: lib/CodeGen/CGExprCXX.cpp:1871
+ CGF.CGM.getLangOpts().AppleKext)))
+ Dtor = DevirtualizedDtor;
+ else {
----------------
`Dtor` could be the destructor for a type derived from `ElementPtr`. We'll
either need to somehow emit a cast to the correct derived type here, or just
abort the devirtualization and emit a virtual call in that case. (The latter is
what `EmitCXXMemberOrOperatorMemberCallExpr` does -- see its checks on
`getCXXRecord(Base)` and `getCXXRecord(Inner)`.)
Eg, for:
```
struct SomethingElse { virtual void f(); };
struct A {
virtual ~A();
};
struct B : SomethingElse, A {
~B() final;
};
void f(B *p) {
delete (A*)p;
}
```
... `Ptr` will be a pointer to an `A` subobject of a `B` object, but
`getDevirtualizedMethod` will still be able to work out that `B::~B` is the
right thing to call here (by looking through the cast and finding that the
pointer must actually point to a `B` object whose destructor is `final`). We
need to either convert `Ptr` back from an `A*` to a `B*` or just not
devirtualize this call.
Repository:
rC Clang
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D63161/new/
https://reviews.llvm.org/D63161
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