[LLVMbugs] [Bug 21074] New: MS ABI: wrong vftables with RTTI + virtual inheritance/functions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21074

            Bug ID: 21074
           Summary: MS ABI: wrong vftables with RTTI + virtual
                    inheritance/functions
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

consider:
struct __declspec(dllexport) ClassName0 {};
struct __declspec(dllexport) ClassName1  {
  virtual void f();
};
struct __declspec(dllexport) ClassName2 : virtual ClassName0 {
  virtual void g();
  ClassName2() {}
};
struct __declspec(dllexport) ClassName3 : virtual ClassName2,
                                          virtual ClassName0,
                                          virtual ClassName1 {
  virtual void h();
};
struct __declspec(dllexport) ClassName4 : virtual ClassName2,
                                          virtual ClassName0,
                                          virtual ClassName3 {};

--- different.cpp_clang.obj.dump        2014-09-25 23:12:17.192451100 -0700
+++ different.cpp_vs.obj.dump   2014-09-25 23:12:17.238455700 -0700
@@ -5,12 +5,15 @@
 const ClassName3::`vftable'{for `ClassName3'}[0]: const ClassName3::`RTTI
Complete Object Locator'{for `ClassName3'}
 const ClassName3::`vftable'{for `ClassName3'}[4]: public: virtual void
__thiscall ClassName3::h(void)
 const ClassName3::`vftable'{for `ClassName1'}[0]: const ClassName3::`RTTI
Complete Object Locator'{for `ClassName1'}
+const ClassName3::`vftable'{for `ClassName1'}[4]: public: virtual void
__thiscall ClassName1::f(void)
 const ClassName3::`vftable'{for `ClassName2'}[0]: const ClassName3::`RTTI
Complete Object Locator'{for `ClassName2'}
 const ClassName3::`vftable'{for `ClassName2'}[4]: public: virtual void
__thiscall ClassName2::g(void)
 const ClassName4::`vftable'[0]: const ClassName4::`RTTI Complete Object
Locator'
 const ClassName4::`vftable'[4]: public: virtual void __thiscall
ClassName2::g(void)
 const ClassName4::`vftable'{for `ClassName1'}[0]: const ClassName4::`RTTI
Complete Object Locator'{for `ClassName1'}
+const ClassName4::`vftable'{for `ClassName1'}[4]: public: virtual void
__thiscall ClassName1::f(void)
 const ClassName4::`vftable'{for `ClassName3'}[0]: const ClassName4::`RTTI
Complete Object Locator'{for `ClassName3'}
+const ClassName4::`vftable'{for `ClassName3'}[4]: public: virtual void
__thiscall ClassName3::h(void)
 const ClassName2::`vbtable'[0]: -4
 const ClassName2::`vbtable'[4]: 4
 const ClassName3::`vbtable'{for `ClassName3'}[0]: -4

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