Attachment 29119 Details for Bug 52991 – Testcase for bitfield and type-packing

Testcase for bitfield and type-packing

msbit_tests.c (text/plain), 2.32 KB, created by Kai Tietz on 2013-01-09 12:30:50 UTC

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Creator: Kai Tietz

Created: 2013-01-09 12:30:50 UTC

Size: 2.32 KB

patch

obsolete

>#include <stdio.h>
>
>static int diff_ptr (const void *p1, const void *p2)
>{
>  const char *c1 = (const char *) p1;
>  const char *c2 = (const char *) p2;
>  return (int) (c2 - c1);
>}
>
>static int check_ptr (const void *base, const void *off, int expect)
>{
>  int v = diff_ptr (base, off);
>  if (v == expect)
>    return 1;
>  printf (" expect %d, but we got %d", expect, v);
>  return 0;
>}
>
>/* First packing */
>#pragma pack(1)
>struct sP1_1 {
>  char a;
>  char b;
>  short c;
>};
>
>struct sP1_2 {
>  char a;
>  unsigned char b;
>  short c;
>};
>
>struct sP1_3 {
>  char a : 1;
>  unsigned char b : 1;
>  short c;
>};
>
>struct sP1_4 {
>  char a : 1;
>  char b : 1;
>  short c;
>};
>
>#pragma pack(2)
>struct sP2_1 {
>  char a;
>  char b;
>  short c;
>};
>struct sP2_2 {
>  char a;
>  unsigned char b;
>  short c;
>};
>struct sP2_4 {
>  char a : 1;
>  char b : 1;
>  short c;
>};
>
>#pragma pack(4)
>struct sP4_1 {
>  char a;
>  char b;
>  short c;
>};
>struct sP4_2 {
>  char a;
>  unsigned char b;
>  short c;
>};
>struct sP4_4 {
>  char a : 1;
>  char b : 1;
>  short c;
>};
>
>#pragma pack(8)
>struct sP8_1 {
>  char a;
>  char b;
>  short c;
>};
>struct sP8_2 {
>  char a;
>  unsigned char b;
>  short c;
>};
>struct sP8_4 {
>  char a : 1;
>  char b : 1;
>  short c;
>};
>
>#define chk(STR, FIELD, EXPECT) \
>  { struct STR a##STR; \
>    if (!check_ptr (&a##STR, &a##STR.FIELD, EXPECT)) \
>      printf (" %s (%s - .) == %d: failed\n", "a" #STR, #FIELD, EXPECT); \
>  }
>
>#define siz(STR, SZ) \
>  if (sizeof (struct STR) != SZ) \
>    printf ("sizeof(%s): is %d and not equal to expected %d\n", #STR, (int) sizeof (struct STR), SZ); \
>
>int main()
>{
>  chk(sP1_1, b, 1);
>  chk(sP1_1, c, 2);
>  siz(sP1_1, 4);
>  chk(sP1_2, b, 1);
>  chk(sP1_2, c, 2);
>  siz(sP1_2, 4);
>  chk(sP1_3, c, 1);
>  siz(sP1_3, 3);
>
>  chk(sP2_1, b, 1);
>  chk(sP2_1, c, 2);
>  siz(sP2_1, 4);
>  chk(sP2_2, b, 1);
>  chk(sP2_2, c, 2);
>  siz(sP2_2, 4);
>
>  chk(sP4_1, b, 1);
>  chk(sP4_1, c, 2);
>  siz(sP4_1, 4);
>  chk(sP4_2, b, 1);
>  chk(sP4_2, c, 2);
>  siz(sP4_2, 4);
>
>  chk(sP8_1, b, 1);
>  chk(sP8_1, c, 2);
>  siz(sP8_1, 4);
>  chk(sP8_2, b, 1);
>  chk(sP8_2, c, 2);
>  siz(sP8_2, 4);
>
>  chk(sP1_4, c, 1);
>  siz(sP1_4, 3);
>  chk(sP2_4, c, 2);
>  siz(sP2_4, 4);
>  chk(sP4_4, c, 2);
>  siz(sP4_4, 4);
>  chk(sP8_4, c, 2);
>  siz(sP8_4, 4);
>  return 0;
>}

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Attachments on bug 52991: 29119 | 29121 | 29122 | 43522