[LLVMbugs] [Bug 18167] New: [-cxx-abi microsoft] Hierarchy involving empty bases has wrong layout

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18167

            Bug ID: 18167
           Summary: [-cxx-abi microsoft] Hierarchy involving empty bases
                    has wrong layout
           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 {};
struct ClassName1 : public ClassName0 {
  int ClassName1FieldName0;
  ClassName1() {}
};
struct ClassName2 : public ClassName1, public ClassName0 {
  bool ClassName2FieldName0;
  ClassName2() {
    printf(
        "ClassName2FieldName0 : %llu\n",
        (unsigned long long)((size_t) & ClassName2FieldName0 -
(size_t)buffer));
  }
};
struct ClassName3 : public ClassName2, public ClassName1 {
  ClassName3() {}
};
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:
ClassName2FieldName0 : 5

clang:
ClassName2FieldName0 : 4

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20131207/a5e53077/attachment.html>