http://llvm.org/bugs/show_bug.cgi?id=18021
Bug ID: 18021
Summary: [-cxx-abi microsoft] Clang lays class out wrong when
most derived class has a bitfield
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
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 ClassName00 {
long long ClassName00FieldName00;
ClassName00() {
printf("ClassName00FieldName00 : %llu\n", (unsigned long
long)((size_t)&ClassName00FieldName00 - (size_t)buffer));
}
};
struct ClassName02: public virtual ClassName00 {
long long ClassName02FieldName00;
ClassName02() {
printf("ClassName02FieldName00 : %llu\n", (unsigned long
long)((size_t)&ClassName02FieldName00 - (size_t)buffer));
}
};
struct ClassName03: public virtual ClassName02 {
int ClassName03FieldName3 : 1;
ClassName03() {
}
};
int main() {
memset(buffer, 0, sizeof(buffer));
new (buffer) ClassName03;
printf(" sizeof(ClassName03): %Iu\n", sizeof(ClassName03));
printf("__alignof(ClassName03): %Iu\n", __alignof(ClassName03));
memset(buffer, 0, sizeof(buffer));
}
clang gives us:
ClassName00FieldName00 : 16
ClassName02FieldName00 : 32
sizeof(ClassName03): 40
__alignof(ClassName03): 8
MSVC gives us:
ClassName00FieldName00 : 16
ClassName02FieldName00 : 40
sizeof(ClassName03): 48
__alignof(ClassName03): 8
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