gcc/testsuite/gcc.dg/struct-ret-3.c

   1 /* PR middle-end/31309 */
   2 /* Origin: Peeter Joot <peeterj@ca.ibm.com> */
   3
   4 /* { dg-do run { target *-*-linux* } } */
   5
   6 #include <sys/mman.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9 #include <errno.h>
  10
  11 unsigned long ossAlignX(unsigned long i, unsigned long X)
  12 {
  13    return ((i + (X - 1)) & ~(unsigned long) (X - 1));
  14 }
  15
  16 struct STRUCT_6_BYTES
  17 {
  18    unsigned char slot[sizeof(unsigned short)];
  19    unsigned char page[sizeof(unsigned int)];
  20 };
  21
  22 struct SQLU_DICT_INFO_0
  23 {
  24    void *pBlah;
  25    char bSomeFlag1;
  26    char bSomeFlag2;
  27    struct STRUCT_6_BYTES dRID;
  28 };
  29
  30 struct SQLU_DATAPART_0
  31 {
  32    struct SQLU_DICT_INFO_0 *pDictRidderInfo;
  33 };
  34
  35 struct XXX
  36 {
  37    struct SQLU_DATAPART_0 *m_pDatapart;
  38 };
  39
  40 struct STRUCT_6_BYTES INIT_6_BYTES_ZERO()
  41 {
  42    struct STRUCT_6_BYTES ridOut = {{0,0}, {0,0,0,0}};
  43    return ridOut;
  44 }
  45
  46 void Initialize(struct XXX *this, int iIndex)
  47 {
  48    struct SQLU_DICT_INFO_0 *pDictRidderInfo
  49      = this->m_pDatapart[iIndex].pDictRidderInfo;
  50    pDictRidderInfo->bSomeFlag1 = 0;
  51    pDictRidderInfo->bSomeFlag2 = 0;
  52    pDictRidderInfo->dRID = INIT_6_BYTES_ZERO();
  53 }
  54
  55 int main(void)
  56 {
  57    int rc;
  58
  59    struct stuff
  60    {
  61       char c0[4096-sizeof(struct XXX)];
  62       struct XXX o;
  63       char c1[4096*2-sizeof(struct SQLU_DATAPART_0)];
  64       struct SQLU_DATAPART_0 dp;
  65       char c2[4096*2-sizeof(struct SQLU_DICT_INFO_0)];
  66       struct SQLU_DICT_INFO_0 di;
  67       char c3[4096];
  68    };
  69
  70    char buf[sizeof(struct stuff)+4096];
  71    struct stuff *u = (struct stuff *)ossAlignX((unsigned long)&buf[0], 4096);
  72    memset(u, 1, sizeof(struct stuff));
  73    u->c1[0] = '\xAA';
  74    u->c2[0] = '\xBB';
  75    u->c3[0] = '\xCC';
  76
  77    rc = mprotect(u->c1, 4096, PROT_NONE);
  78    if (rc == -1)
  79       printf("mprotect:c1: %d: %d(%s)\n", rc, errno, strerror(errno));
  80
  81    rc = mprotect(u->c2, 4096, PROT_NONE);
  82    if (rc == -1)
  83       printf("mprotect:c2: %d: %d(%s)\n", rc, errno, strerror(errno));
  84
  85    rc = mprotect(u->c3, 4096, PROT_NONE);
  86    if (rc == -1)
  87       printf("mprotect:c3: %d: %d(%s)\n", rc, errno, strerror(errno));
  88
  89    u->o.m_pDatapart = &u->dp;
  90    u->dp.pDictRidderInfo = &u->di;
  91    Initialize(&u->o, 0);
  92
  93    mprotect(u->c1, 4096, PROT_READ|PROT_WRITE);
  94    mprotect(u->c2, 4096, PROT_READ|PROT_WRITE);
  95    mprotect(u->c3, 4096, PROT_READ|PROT_WRITE);
  96
  97    return 0;
  98 }