[LLVMbugs] [Bug 17767] New: [-cxx-abi microsoft] C++ class improperly laid on top of another

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17767

            Bug ID: 17767
           Summary: [-cxx-abi microsoft] C++ class improperly laid on top
                    of another
           Product: clang
           Version: trunk
          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:
#include <stddef.h>
#include <stdio.h>
#include <string.h>
char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct TypeName0 {
        TypeName0() {
                printf("Typename0 - this: %llu\n", (unsigned long
long)((size_t)this - (size_t)buffer));
        }
};
struct TypeName2: public TypeName0 {
        char TypeName2FieldName0;
        TypeName2() {
                printf("Typename2 - this: %llu\n", (unsigned long
long)((size_t)this - (size_t)buffer));
                printf("Typename2 - Fiel: %llu\n", (unsigned long
long)((size_t)&TypeName2FieldName0 - (size_t)buffer));
        }
};
struct TypeName3: public TypeName0, public TypeName2 {
        TypeName3() {
                printf("Typename3 - this: %llu\n", (unsigned long
long)((size_t)this - (size_t)buffer));
        }
};
int main() {
        memset(buffer, 0, sizeof(buffer));                                      
        new (buffer) TypeName3;
}

clang gives:
Typename0 - this: 0
Typename0 - this: 0
Typename2 - this: 0
Typename2 - Fiel: 0
Typename3 - this: 0

msvc gives:
Typename0 - this: 0
Typename0 - this: 1
Typename2 - this: 1
Typename2 - Fiel: 1
Typename3 - this: 0

-- 
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/20131101/3ef84daa/attachment.html>