bitfield-4.mm

来自「用于进行gcc测试」· MM 代码 · 共 57 行

/* Check if the @defs() construct preserves the correct
   layout of bitfields.  */
/* Contributed by Ziemowit Laski <[e-mail]>.  */
/* { dg-options "-lobjc -Wpadded" } */
/* { dg-do run } */

#include <objc/Object.h>

#include <stdlib.h>
#include <string.h>

#define CHECK_IF(expr) if(!(expr)) abort()

enum Enum { one, two, three, four };

@interface Base: Object {
  unsigned a: 2;
  int b: 3;
  enum Enum c: 4;
  unsigned d: 5;
} /* { dg-warning "padding struct size to alignment boundary" } */
@end

@interface Derived: Base {
  signed e: 5;
  int f: 4;
  enum Enum g: 3;
}
@end
  
/* Note that the semicolon after @defs(...) is optional.  */

typedef struct { @defs(Base) } Base_t;  /* { dg-warning "padding struct size to alignment boundary" } */
typedef struct { @defs(Derived); } Derived_t;

int main(void)
{
  CHECK_IF(sizeof(Base_t) == sizeof(Base));
  CHECK_IF(sizeof(Derived_t) == sizeof(Derived));

#ifdef __NEXT_RUNTIME__
  CHECK_IF(!strcmp(@encode(Base), "{Base=#b2b3b4b5}"));
  CHECK_IF(!strcmp(@encode(Derived), "{Derived=#b2b3b4b5b5b4b3}"));

  CHECK_IF(!strcmp(@encode(Base_t), "{?=#b2b3b4b5}"));
  CHECK_IF(!strcmp(@encode(Derived_t), "{?=#b2b3b4b5b5b4b3}"));
#endif /* __NEXT_RUNTIME__ */

  return 0;
}

/* { dg-excess-errors "In file included from" { target lp64 } } */
/* { dg-bogus "padding struct to align" "PR23610" { xfail lp64 } 1 } */

/* { dg-bogus "padding struct size" "PR23610" { xfail lp64 } 28 } */
/* { dg-bogus "padding struct size" "PR23610" { xfail lp64 } 34 } */