http://llvm.org/bugs/show_bug.cgi?id=18027
Bug ID: 18027
Summary: [-cxx-abi microsoft] clang calculates size wrong of
struct with field of struct type with aligned field
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
#include <stddef.h>
#include <stdio.h>
#include <string.h>
char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct ClassName0 {
int ClassName0FieldName0;
ClassName0() {
printf("ClassName0FieldName0 : %llu\n", (unsigned long
long)((size_t)&ClassName0FieldName0 - (size_t)buffer));
}
};
struct ClassName1: public virtual ClassName0 {
__declspec(align(512)) short ClassName1FieldName0;
ClassName1() {
printf("ClassName1FieldName0 : %llu\n", (unsigned long
long)((size_t)&ClassName1FieldName0 - (size_t)buffer));
}
};
struct ClassName2: public virtual ClassName0 {
ClassName1 ClassName2FieldName0;
ClassName2() {
printf("ClassName2FieldName0 : %llu\n", (unsigned long
long)((size_t)&ClassName2FieldName0 - (size_t)buffer));
}
};
struct ClassName3: public virtual ClassName1, public virtual ClassName2 {
int 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): 4
__alignof(ClassName0): 4
ClassName0FieldName0 : 1024
ClassName1FieldName0 : 512
sizeof(ClassName1): 1536
__alignof(ClassName1): 512
ClassName0FieldName0 : 2048
ClassName0FieldName0 : 1536
ClassName1FieldName0 : 1024
ClassName2FieldName0 : 512
sizeof(ClassName2): 2560
__alignof(ClassName2): 512
ClassName0FieldName0 : 8
ClassName1FieldName0 : 1024
ClassName0FieldName0 : 3072
ClassName1FieldName0 : 2560
ClassName2FieldName0 : 2048
ClassName3FieldName0 : 4
sizeof(ClassName3): 3584
__alignof(ClassName3): 512
clang:
ClassName0FieldName0 : 0
sizeof(ClassName0): 4
__alignof(ClassName0): 4
ClassName0FieldName0 : 1024
ClassName1FieldName0 : 512
sizeof(ClassName1): 1536
__alignof(ClassName1): 512
ClassName0FieldName0 : 2048
ClassName0FieldName0 : 1536
ClassName1FieldName0 : 1024
ClassName2FieldName0 : 512
sizeof(ClassName2): 2052
__alignof(ClassName2): 512
ClassName0FieldName0 : 8
ClassName1FieldName0 : 1024
ClassName0FieldName0 : 3072
ClassName1FieldName0 : 2560
ClassName2FieldName0 : 2048
ClassName3FieldName0 : 4
sizeof(ClassName3): 3584
__alignof(ClassName3): 512
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