http://llvm.org/bugs/show_bug.cgi?id=18025
Bug ID: 18025
Summary: [-cxx-abi microsoft] clang ignores pragma pack around
class definition
Product: clang
Version: trunk
Hardware: PC
OS: All
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 ClassName0 {
short ClassName0FieldName0;
ClassName0() {
printf("ClassName0FieldName0 : %llu\n", (unsigned long
long)((size_t)&ClassName0FieldName0 - (size_t)buffer));
}
};
struct ClassName1 {
long long ClassName1FieldName0;
ClassName1() {
printf("ClassName1FieldName0 : %llu\n", (unsigned long
long)((size_t)&ClassName1FieldName0 - (size_t)buffer));
}
};
#pragma pack(push, 2)
struct ClassName2: public virtual ClassName1, public virtual ClassName0 {
float ClassName2FieldName0;
ClassName2() {
printf("ClassName2FieldName0 : %llu\n", (unsigned long
long)((size_t)&ClassName2FieldName0 - (size_t)buffer));
}
};
#pragma pack(pop)
struct ClassName3: public ClassName0, public ClassName1 {
short ClassName3FieldName0;
ClassName3() {
printf("ClassName3FieldName0 : %llu\n", (unsigned long
long)((size_t)&ClassName3FieldName0 - (size_t)buffer));
}
};
int main() {
memset(buffer, 0, sizeof(buffer));
new (buffer) ClassName0;
printf(" sizeof(ClassName0): %Iu\n", sizeof(ClassName0));
printf("__alignof(ClassName0): %Iu\n", __alignof(ClassName0));
memset(buffer, 0, sizeof(buffer));
new (buffer) ClassName1;
printf(" sizeof(ClassName1): %Iu\n", sizeof(ClassName1));
printf("__alignof(ClassName1): %Iu\n", __alignof(ClassName1));
memset(buffer, 0, sizeof(buffer));
new (buffer) ClassName2;
printf(" sizeof(ClassName2): %Iu\n", sizeof(ClassName2));
printf("__alignof(ClassName2): %Iu\n", __alignof(ClassName2));
memset(buffer, 0, sizeof(buffer));
new (buffer) ClassName3;
printf(" sizeof(ClassName3): %Iu\n", sizeof(ClassName3));
printf("__alignof(ClassName3): %Iu\n", __alignof(ClassName3));
}
msvc:
ClassName0FieldName0 : 0
sizeof(ClassName0): 2
__alignof(ClassName0): 2
ClassName1FieldName0 : 0
sizeof(ClassName1): 8
__alignof(ClassName1): 8
ClassName1FieldName0 : 8
ClassName0FieldName0 : 16
ClassName2FieldName0 : 4
sizeof(ClassName2): 18
__alignof(ClassName2): 2
ClassName0FieldName0 : 0
ClassName1FieldName0 : 8
ClassName3FieldName0 : 16
sizeof(ClassName3): 24
__alignof(ClassName3): 8
clang:
ClassName0FieldName0 : 0
sizeof(ClassName0): 2
__alignof(ClassName0): 2
ClassName1FieldName0 : 0
sizeof(ClassName1): 8
__alignof(ClassName1): 8
ClassName1FieldName0 : 8
ClassName0FieldName0 : 16
ClassName2FieldName0 : 4
sizeof(ClassName2): 18
__alignof(ClassName2): 8
ClassName0FieldName0 : 0
ClassName1FieldName0 : 8
ClassName3FieldName0 : 16
sizeof(ClassName3): 24
__alignof(ClassName3): 8
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