[LLVMbugs] [Bug 18186] New: [-cxx-abi microsoft] vfptr not properly aligned?

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18186

            Bug ID: 18186
           Summary: [-cxx-abi microsoft] vfptr not properly aligned?
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            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:
#if defined(__clang__) || defined(__GNUC__)
typedef __SIZE_TYPE__ size_t;
#endif
extern "C" int printf(const char *fmt, ...);
static char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct ClassName0 {
  bool ClassName0FieldName0;
  ClassName0() {
    printf(
        "ClassName0 - this: %llu\n",
        (unsigned long long)((size_t) this  - (size_t)buffer));
    printf(
        "ClassName0FieldName0 : %llu\n",
        (unsigned long long)((size_t) & ClassName0FieldName0 -
(size_t)buffer));
  }
};
struct ClassName1 : public ClassName0 {
  virtual void ClassName1Method() {}
  ClassName1() {
    printf(
        "ClassName1 - this: %llu\n",
        (unsigned long long)((size_t) this  - (size_t)buffer));
  }
};
struct ClassName2 : public ClassName1, public ClassName0 {
  virtual void ClassName2Method() {}
  ClassName2() {
    printf(
        "ClassName2 - this: %llu\n",
        (unsigned long long)((size_t) this  - (size_t)buffer));
  }
};
struct ClassName3 : public ClassName0, public ClassName1, public ClassName2 {
  ClassName3() {
    printf(
        "ClassName3 - this: %llu\n",
        (unsigned long long)((size_t) this  - (size_t)buffer));
  }
};
static void test_layout(const char *class_name, size_t size_of_class,
                        size_t align_of_class) {}
template <typename Class>
static void init_mem() {
  new (buffer) Class;
}
#define test(Class) \
  init_mem<Class>(), test_layout(#Class, sizeof(Class), __alignof(Class))
int main() { test(ClassName3); }

msvc:
ClassName0 - this: 20
ClassName0FieldName0 : 20
ClassName0 - this: 4
ClassName0FieldName0 : 4
ClassName1 - this: 0
ClassName0 - this: 12
ClassName0FieldName0 : 12
ClassName1 - this: 8
ClassName0 - this: 16
ClassName0FieldName0 : 16
ClassName2 - this: 8
ClassName3 - this: 0

clang:
ClassName0 - this: 8
ClassName0FieldName0 : 8
ClassName0 - this: 4
ClassName0FieldName0 : 4
ClassName1 - this: 0
ClassName0 - this: 16
ClassName0FieldName0 : 16
ClassName1 - this: 12
ClassName0 - this: 20
ClassName0FieldName0 : 20
ClassName2 - this: 12
ClassName3 - this: 0

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