struct-layout-1_generate.c

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

	m &= (1ULL << e->len) - 1;
      l1 &= m;
      l2 &= m;
      fprintf (outfile, "%lluU%s,%lluU%s", l1, l1 > 4294967295U ? "LL" : "",
	       l2, l2 > 4294967295U ? "LL" : "");
      break;
    case TYPE_FLOAT:
      l1 &= 0xffffff;
      l2 &= 0xffffff;
      signs = generate_random () & 3;
      fprintf (outfile, "%s%f,%s%f", (signs & 1) ? "-" : "",
	       ((double) l1) / 64, (signs & 2) ? "-" : "", ((double) l2) / 64);
      break;
    case TYPE_CINT:
      signs = generate_random () & 3;
      l1 &= e->type->maxval;
      l2 &= e->type->maxval;
      fprintf (outfile, "CINT(%s%llu%s,%s%llu%s),",
	       (signs & 1) ? "-" : "", l1, l1 > 2147483647 ? "LL" : "",
	       (signs & 2) ? "-" : "", l2, l2 > 2147483647 ? "LL" : "");
      signs = generate_random () & 3;
      l1 = getrandll ();
      l2 = getrandll ();
      l1 &= e->type->maxval;
      l2 &= e->type->maxval;
      fprintf (outfile, "CINT(%s%llu%s,%s%llu%s)",
	       (signs & 1) ? "-" : "", l1, l1 > 2147483647 ? "LL" : "",
	       (signs & 2) ? "-" : "", l2, l2 > 2147483647 ? "LL" : "");
      break;
    case TYPE_CUINT:
      l1 &= e->type->maxval;
      l2 &= e->type->maxval;
      fprintf (outfile, "CINT(%lluU%s,%lluU%s),",
	       l1, l1 > 4294967295U ? "LL" : "",
	       l2, l2 > 4294967295U ? "LL" : "");
      l1 = getrandll ();
      l2 = getrandll ();
      l1 &= e->type->maxval;
      l2 &= e->type->maxval;
      fprintf (outfile, "CINT(%lluU%s,%lluU%s)",
	       l1, l1 > 4294967295U ? "LL" : "",
	       l2, l2 > 4294967295U ? "LL" : "");
      break;
    case TYPE_CFLOAT:
      l1 &= 0xffffff;
      l2 &= 0xffffff;
      signs = generate_random () & 3;
      fprintf (outfile, "CDBL(%s%f,%s%f),",
	       (signs & 1) ? "-" : "", ((double) l1) / 64,
	       (signs & 2) ? "-" : "", ((double) l2) / 64);
      l1 = getrandll ();
      l2 = getrandll ();
      l1 &= 0xffffff;
      l2 &= 0xffffff;
      signs = generate_random () & 3;
      fprintf (outfile, "CDBL(%s%f,%s%f)",
	       (signs & 1) ? "-" : "", ((double) l1) / 64,
	       (signs & 2) ? "-" : "", ((double) l2) / 64);
      break;
    case TYPE_UENUM:
      if (e->type->maxval == 0)
	fputs ("e0_0,e0_0", outfile);
      else if (e->type->maxval == 1)
        fprintf (outfile, "e1_%lld,e1_%lld", l1 & 1, l2 & 1);
      else
        {
	  p = strchr (e->type->name, '\0');
	  while (--p >= e->type->name && *p >= '0' && *p <= '9');
	  p++;
          l1 %= 7;
          l2 %= 7;
          if (l1 > 3)
            l1 += e->type->maxval - 6;
          if (l2 > 3)
            l2 += e->type->maxval - 6;
	  fprintf (outfile, "e%s_%lld,e%s_%lld", p, l1, p, l2);
        }
      break;
    case TYPE_SENUM:
      p = strchr (e->type->name, '\0');
      while (--p >= e->type->name && *p >= '0' && *p <= '9');
      p++;
      l1 %= 7;
      l2 %= 7;
      fprintf (outfile, "e%s_%s%lld,e%s_%s%lld",
	       p, l1 < 3 ? "m" : "",
	       l1 == 3 ? 0LL : e->type->maxval - (l1 & 3),
	       p, l2 < 3 ? "m" : "",
	       l2 == 3 ? 0LL : e->type->maxval - (l2 & 3));
      break;
    case TYPE_PTR:
      l1 %= 256;
      l2 %= 256;
      fprintf (outfile, "(%s)&intarray[%lld],(%s)&intarray[%lld]",
	       e->type->name, l1, e->type->name, l2);
      break;
    case TYPE_FNPTR:
      l1 %= 10;
      l2 %= 10;
      fprintf (outfile, "fn%lld,fn%lld", l1, l2);
      break;
    default:
      abort ();
    }
  fputs (")", outfile);
}

int
subvalues (struct entry *e, char *p, char *letter)
{
  int i, j;
  char *q;
  if (p >= namebuf + sizeof (namebuf) - 32)
    abort ();
  p[0] = *letter;
  p[1] = '\0';
  q = p + 1;
  switch (e[0].etype)
    {
    case ETYPE_STRUCT_ARRAY:
    case ETYPE_UNION_ARRAY:
      if (e[0].arr_len == 0 || e[0].arr_len == 255)
	{
	  *letter += 1 + e[0].len;
	  return 1 + e[0].len;
	}
      i = generate_random () % e[0].arr_len;
      snprintf (p, sizeof (namebuf) - (p - namebuf) - 1,
		"%c[%d]", *letter, i);
      q = strchr (p, '\0');
      /* FALLTHROUGH */
    case ETYPE_STRUCT:
    case ETYPE_UNION:
      *q++ = '.';
      ++*letter;
      for (i = 1; i <= e[0].len; )
	{
	  i += subvalues (e + i, q, letter);
	  if (e[0].etype == ETYPE_UNION || e[0].etype == ETYPE_UNION_ARRAY)
	    {
	      *letter += e[0].len - i + 1;
	      break;
	    }
	}
      return 1 + e[0].len;
    case ETYPE_TYPE:
      ++*letter;
      output_FNB ('F', e);
      return 1;
    case ETYPE_ARRAY:
      if (e[0].arr_len == 0 || e[0].arr_len == 255)
	{
	  ++*letter;
	  return 1;
	}
      i = generate_random () % e[0].arr_len;
      snprintf (p, sizeof (namebuf) - (p - namebuf),
		"%c[%d]", *letter, i);
      output_FNB ('F', e);
      if ((generate_random () & 7) == 0)
	{
	  j = generate_random () % e[0].arr_len;
	  if (i != j)
	    {
	      snprintf (p, sizeof (namebuf) - (p - namebuf),
			"%c[%d]", *letter, j);
	      output_FNB ('F', e);
	    }
	}
      ++*letter;
      return 1;
    case ETYPE_BITFLD:
      ++*letter;
      if (e[0].len != 0)
	output_FNB ('B', e);
      return 1;
    }
}

/* DERIVED FROM:
--------------------------------------------------------------------
lookup2.c, by Bob Jenkins, December 1996, Public Domain.
hash(), hash2(), hash3, and mix() are externally useful functions.
Routines to test the hash are included if SELF_TEST is defined.
You can use this free for any purpose.  It has no warranty.
--------------------------------------------------------------------
*/

/*
--------------------------------------------------------------------
mix -- mix 3 32-bit values reversibly.
For every delta with one or two bit set, and the deltas of all three
  high bits or all three low bits, whether the original value of a,b,c
  is almost all zero or is uniformly distributed,
* If mix() is run forward or backward, at least 32 bits in a,b,c
  have at least 1/4 probability of changing.
* If mix() is run forward, every bit of c will change between 1/3 and
  2/3 of the time.  (Well, 22/100 and 78/100 for some 2-bit deltas.)
mix() was built out of 36 single-cycle latency instructions in a 
  structure that could supported 2x parallelism, like so:
      a -= b; 
      a -= c; x = (c>>13);
      b -= c; a ^= x;
      b -= a; x = (a<<8);
      c -= a; b ^= x;
      c -= b; x = (b>>13);
      ...
  Unfortunately, superscalar Pentiums and Sparcs can't take advantage 
  of that parallelism.  They've also turned some of those single-cycle
  latency instructions into multi-cycle latency instructions.  Still,
  this is the fastest good hash I could find.  There were about 2^^68
  to choose from.  I only looked at a billion or so.
--------------------------------------------------------------------
*/
/* same, but slower, works on systems that might have 8 byte hashval_t's */
#define mix(a,b,c) \
{ \
  a -= b; a -= c; a ^= (c>>13); \
  b -= c; b -= a; b ^= (a<< 8); \
  c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
  a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
  b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
  c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
  a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
  b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
  c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
}

/*
--------------------------------------------------------------------
hash() -- hash a variable-length key into a 32-bit value
  k     : the key (the unaligned variable-length array of bytes)
  len   : the length of the key, counting by bytes
  level : can be any 4-byte value
Returns a 32-bit value.  Every bit of the key affects every bit of
the return value.  Every 1-bit and 2-bit delta achieves avalanche.
About 36+6len instructions.

The best hash table sizes are powers of 2.  There is no need to do
mod a prime (mod is sooo slow!).  If you need less than 32 bits,
use a bitmask.  For example, if you need only 10 bits, do
  h = (h & hashmask(10));
In which case, the hash table should have hashsize(10) elements.

If you are hashing n strings (ub1 **)k, do it like this:
  for (i=0, h=0; i<n; ++i) h = hash( k[i], len[i], h);

By Bob Jenkins, 1996.  [e-mail].  You may use this
code any way you wish, private, educational, or commercial.  It's free.

See http://burtleburtle.net/bob/hash/evahash.html
Use for hash table lookup, or anything where one collision in 2^32 is
acceptable.  Do NOT use for cryptographic purposes.
--------------------------------------------------------------------
*/

static hashval_t
iterative_hash (const void *k_in /* the key */,
                register size_t  length /* the length of the key */,
                register hashval_t initval /* the previous hash, or
                                              an arbitrary value */)
{
  register const unsigned char *k = (const unsigned char *)k_in;
  register hashval_t a,b,c,len;

  /* Set up the internal state */
  len = length;
  a = b = 0x9e3779b9;  /* the golden ratio; an arbitrary value */
  c = initval;           /* the previous hash value */

  /*---------------------------------------- handle most of the key */
    while (len >= 12)
      {
	a += (k[0] +((hashval_t)k[1]<<8) +((hashval_t)k[2]<<16) +((hashval_t)k[3]<<24));
	b += (k[4] +((hashval_t)k[5]<<8) +((hashval_t)k[6]<<16) +((hashval_t)k[7]<<24));
	c += (k[8] +((hashval_t)k[9]<<8) +((hashval_t)k[10]<<16)+((hashval_t)k[11]<<24));
	mix(a,b,c);
	k += 12; len -= 12;
      }

  /*------------------------------------- handle the last 11 bytes */
  c += length;
  switch(len)              /* all the case statements fall through */
    {
    case 11: c+=((hashval_t)k[10]<<24);
    case 10: c+=((hashval_t)k[9]<<16);
    case 9 : c+=((hashval_t)k[8]<<8);
      /* the first byte of c is reserved for the length */
    case 8 : b+=((hashval_t)k[7]<<24);
    case 7 : b+=((hashval_t)k[6]<<16);
    case 6 : b+=((hashval_t)k[5]<<8);
    case 5 : b+=k[4];
    case 4 : a+=((hashval_t)k[3]<<24);
    case 3 : a+=((hashval_t)k[2]<<16);
    case 2 : a+=((hashval_t)k[1]<<8);
    case 1 : a+=k[0];
      /* case 0: nothing left to add */
    }
  mix(a,b,c);
  /*-------------------------------------------- report the result */
  return c;
}

hashval_t
e_hash (const void *a)
{
  const struct entry *e = a;
  hashval_t ret = 0;
  int i;

  if (e[0].etype != ETYPE_STRUCT && e[0].etype != ETYPE_UNION)
    abort ();
  for (i = 0; i <= e[0].len; ++i)
    {
      int attriblen;
      ret = iterative_hash (&e[i], offsetof (struct entry, attrib), ret);
      attriblen = e[i].attrib ? strlen (e[i].attrib) : -1;
      ret = iterative_hash (&attriblen, sizeof (int), ret);
      if (e[i].attrib)
        ret = iterative_hash (e[i].attrib, attriblen, ret);
    }
  return ret;
}

int
e_eq (const void *a, const void *b)
{
  const struct entry *ea = a, *eb = b;
  int i;
  if (ea[0].etype != ETYPE_STRUCT && ea[0].etype != ETYPE_UNION)
    abort ();
  if (ea[0].len != eb[0].len)
    return 0;
  for (i = 0; i <= ea[0].len; ++i)
    {
      if (ea[i].etype != eb[i].etype
	  || ea[i].len != eb[i].len
	  || ea[i].arr_len != eb[i].arr_len
	  || ea[i].type != eb[i].type)
	return 0;
      if ((ea[i].attrib == NULL) ^ (eb[i].attrib == NULL))
	return 0;
      if (ea[i].attrib && strcmp (ea[i].attrib, eb[i].attrib) != 0)
	return 0;
    }
  return 1;
}

static int 
e_exists (const struct entry *e) 
{
  struct entry *h;
  hashval_t hval;

  hval = e_hash (e);
  for (h = hash_table[hval % HASH_SIZE]; h; h = h->next)
    if (e_eq (e, h))
      return 1;
  return 0;
}

static void
e_insert (struct entry *e)
{
  hashval_t hval;

  hval = e_hash (e);
  e->next = hash_table[hval % HASH_SIZE];
  hash_table[hval % HASH_SIZE] = e;
}

void
output (struct entry *e)
{
  int i;
  char c;
  struct entry *n;
  const char *skip_cint = "";

  if (e[0].etype != ETYPE_STRUCT && e[0].etype != ETYPE_UNION)
    abort ();

  if (e_exists (e))
    return;

  n = (struct entry *) malloc ((e[0].len + 1) * sizeof (struct entry));
  memcpy (n, e, (e[0].len + 1) * sizeof (struct entry));
  e_insert (n);

  if (idx == limidx)
    switchfiles (e[0].len);

  for (i = 1; i <= e[0].len; ++i)
    if ((e[i].etype == ETYPE_TYPE || e[i].etype == ETYPE_ARRAY)
	&& (e[i].type->type == TYPE_CINT || e[i].type->type == TYPE_CUINT))
      break;
  if (i <= e[0].len)
    skip_cint = "CI";
  if (e[0].attrib)
    fprintf (outfile, (generate_random () & 1)
	     ? "TX%s(%d,%s %s,," : "TX%s(%d,%s,%s,", skip_cint,
	     idx, e[0].etype == ETYPE_STRUCT ? "struct" : "union",
	     e[0].attrib);
  else if (e[0].etype == ETYPE_STRUCT)
    fprintf (outfile, "T%s(%d,", skip_cint, idx);
  else
    fprintf (outfile, "U%s(%d,", skip_cint, idx);
  c = 'a';
  for (i = 1; i <= e[0].len; )
    i += subfield (e + i, &c);
  fputs (",", outfile);
  c = 'a';
  for (i = 1; i <= e[0].len; )
    {
      i += subvalues (e + i, namebuf, &c);
      if (e[0].etype == ETYPE_UNION)
        break;
    }
  fputs (")\n", outfile);
  if (output_one && idx == limidx)
    exit (0);
  ++idx;
}

enum FEATURE
{
  FEATURE_VECTOR = 1,
  FEATURE_COMPLEX = 2,
  FEATURE_ALIGNEDPACKED = 4,
  FEATURE_ZEROARRAY = 8,
  FEATURE_ZEROBITFLD = 16,
  ALL_FEATURES = FEATURE_COMPLEX | FEATURE_VECTOR | FEATURE_ZEROARRAY
		 | FEATURE_ALIGNEDPACKED | FEATURE_ZEROBITFLD
};

void
singles (enum FEATURE features)
{
  struct entry e[2];
  int i;
  memset (e, 0, sizeof (e));
  e[0].etype = ETYPE_STRUCT;
  output (e);
  e[0].etype = ETYPE_UNION;
  output (e);
  for (i = 0;
       i < ((features & FEATURE_ALIGNEDPACKED) ? NATTRIBS2 : NATTRIBS1);
       ++i)
    {
      e[0].attrib = attributes[i];
      e[0].etype = ETYPE_STRUCT;
      output (e);
      e[0].etype = ETYPE_UNION;
      output (e);
    }
  e[0].len = 1;
  e[0].attrib = NULL;
  for (i = 0; i < NTYPES2; ++i)
    {
      e[0].etype = ETYPE_STRUCT;
      e[1].etype = ETYPE_TYPE;
      e[1].type = &base_types[i];
      output (e);
      e[0].etype = ETYPE_UNION;
      output (e);
    }
  if (features & FEATURE_COMPLEX)
    for (i = 0; i < NCTYPES2; ++i)
      {
	e[0].etype = ETYPE_STRUCT;
	e[1].etype = ETYPE_TYPE;
	e[1].type = &complex_types[i];
	output (e);
	e[0].etype = ETYPE_UNION;
	output (e);
      }
  if (features & FEATURE_VECTOR)
    for (i = 0; i < NVTYPES2; ++i)