http://llvm.org/bugs/show_bug.cgi?id=21073
Bug ID: 21073
Summary: MS ABI: Derived class has fewer vftable entries than
base
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
consider:
struct __declspec(dllexport) A {
virtual A *f();
};
struct __declspec(dllexport) B : virtual A {
virtual B *f();
};
struct __declspec(dllexport) C : virtual A, virtual B {};
--- different.cpp_clang.obj.dump 2014-09-25 13:24:59.240925700 -0700
+++ different.cpp_vs.obj.dump 2014-09-25 13:24:59.286925700 -0700
@@ -1,7 +1,8 @@
const A::`vftable'[0]: public: virtual struct A * __thiscall A::f(void)
const B::`vftable'[0]: public: struct A * __thiscall B::f(void)
const B::`vftable'[4]: public: virtual struct B * __thiscall B::f(void)
-const C::`vftable'[0]: [thunk]:public: virtual struct A * __thiscall
B::f`adjustor{4294967288}' (void)
+const C::`vftable'[0]: [thunk]:public: virtual struct B * __thiscall
B::f`adjustor{4294967288}' (void)
+const C::`vftable'[4]: [thunk]:public: virtual struct B * __thiscall
B::f`adjustor{4294967288}' (void)
const B::`vbtable'[0]: 0
const B::`vbtable'[4]: 4
const C::`vbtable'{for `C'}[0]: 0
We don't give C fewer vftable slots than B.
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