gcc/varray.c

   1 /* Virtual array support.
   2    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006, 2007
   3    Free Software Foundation, Inc.
   4    Contributed by Cygnus Solutions.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GCC; see the file COPYING3.  If not see
  20    <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "toplev.h"
  27 #include "varray.h"
  28 #include "ggc.h"
  29 #include "hashtab.h"
  30
  31 #define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))
  32
  33 #ifdef GATHER_STATISTICS
  34
  35 /* Store information about each particular varray.  */
  36 struct varray_descriptor
  37 {
  38   const char *name;
  39   int allocated;
  40   int created;
  41   int resized;
  42   int copied;
  43 };
  44
  45 /* Hashtable mapping varray names to descriptors.  */
  46 static htab_t varray_hash;
  47
  48 /* Hashtable helpers.  */
  49 static hashval_t
  50 hash_descriptor (const void *p)
  51 {
  52   const struct varray_descriptor *d = p;
  53   return htab_hash_pointer (d->name);
  54 }
  55 static int
  56 eq_descriptor (const void *p1, const void *p2)
  57 {
  58   const struct varray_descriptor *d = p1;
  59   return d->name == p2;
  60 }
  61
  62 /* For given name, return descriptor, create new if needed.  */
  63 static struct varray_descriptor *
  64 varray_descriptor (const char *name)
  65 {
  66   struct varray_descriptor **slot;
  67
  68   if (!varray_hash)
  69     varray_hash = htab_create (10, hash_descriptor, eq_descriptor, NULL);
  70
  71   slot = (struct varray_descriptor **)
  72     htab_find_slot_with_hash (varray_hash, name,
  73                               htab_hash_pointer (name),
  74                               1);
  75   if (*slot)
  76     return *slot;
  77   *slot = xcalloc (sizeof (**slot), 1);
  78   (*slot)->name = name;
  79   return *slot;
  80 }
  81 #endif
  82
  83 /* Do not add any more non-GC items here.  Please either remove or GC
  84    those items that are not GCed.  */
  85
  86 static const struct {
  87   unsigned char size;
  88   bool uses_ggc;
  89 } element[NUM_VARRAY_DATA] = {
  90   { sizeof (char), 1 },
  91   { sizeof (unsigned char), 1 },
  92   { sizeof (short), 1 },
  93   { sizeof (unsigned short), 1 },
  94   { sizeof (int), 1 },
  95   { sizeof (unsigned int), 1 },
  96   { sizeof (long), 1 },
  97   { sizeof (unsigned long), 1 },
  98   { sizeof (HOST_WIDE_INT), 1 },
  99   { sizeof (unsigned HOST_WIDE_INT), 1 },
 100   { sizeof (void *), 1 },
 101   { sizeof (void *), 0 },
 102   { sizeof (char *), 1 },
 103   { sizeof (struct rtx_def *), 1 },
 104   { sizeof (struct rtvec_def *), 1 },
 105   { sizeof (union tree_node *), 1 },
 106   { sizeof (struct bitmap_head_def *), 1 },
 107   { sizeof (struct reg_info_def *), 0 },
 108   { sizeof (struct basic_block_def *), 1 },
 109   { sizeof (struct elt_list *), 1 },
 110   { sizeof (struct edge_def *), 1 },
 111   { sizeof (tree *), 1 },
 112 };
 113
 114 /* Allocate a virtual array with NUM_ELEMENT elements, each of which is
 115    ELEMENT_SIZE bytes long, named NAME.  Array elements are zeroed.  */
 116 varray_type
 117 varray_init (size_t num_elements, enum varray_data_enum element_kind,
 118              const char *name)
 119 {
 120   size_t data_size = num_elements * element[element_kind].size;
 121   varray_type ptr;
 122 #ifdef GATHER_STATISTICS
 123   struct varray_descriptor *desc = varray_descriptor (name);
 124
 125   desc->created++;
 126   desc->allocated += data_size + VARRAY_HDR_SIZE;
 127 #endif
 128   if (element[element_kind].uses_ggc)
 129     ptr = ggc_alloc_cleared (VARRAY_HDR_SIZE + data_size);
 130   else
 131     ptr = xcalloc (VARRAY_HDR_SIZE + data_size, 1);
 132
 133   ptr->num_elements = num_elements;
 134   ptr->elements_used = 0;
 135   ptr->type = element_kind;
 136   ptr->name = name;
 137   return ptr;
 138 }
 139
 140 /* Grow/shrink the virtual array VA to N elements.  Zero any new elements
 141    allocated.  */
 142 varray_type
 143 varray_grow (varray_type va, size_t n)
 144 {
 145   size_t old_elements = va->num_elements;
 146   if (n != old_elements)
 147     {
 148       size_t elem_size = element[va->type].size;
 149       size_t old_data_size = old_elements * elem_size;
 150       size_t data_size = n * elem_size;
 151 #ifdef GATHER_STATISTICS
 152       struct varray_descriptor *desc = varray_descriptor (va->name);
 153       varray_type oldva = va;
 154
 155       if (data_size > old_data_size)
 156         desc->allocated += data_size - old_data_size;
 157       desc->resized ++;
 158 #endif
 159
 160
 161       if (element[va->type].uses_ggc)
 162         va = ggc_realloc (va, VARRAY_HDR_SIZE + data_size);
 163       else
 164         va = xrealloc (va, VARRAY_HDR_SIZE + data_size);
 165       va->num_elements = n;
 166       if (n > old_elements)
 167         memset (&va->data.vdt_c[old_data_size], 0, data_size - old_data_size);
 168 #ifdef GATHER_STATISTICS
 169       if (oldva != va)
 170         desc->copied++;
 171 #endif
 172     }
 173
 174   return va;
 175 }
 176
 177 /* Reset a varray to its original state.  */
 178 void
 179 varray_clear (varray_type va)
 180 {
 181   size_t data_size = element[va->type].size * va->num_elements;
 182
 183   memset (va->data.vdt_c, 0, data_size);
 184   va->elements_used = 0;
 185 }
 186
 187 /* Check the bounds of a varray access.  */
 188
 189 #if defined ENABLE_CHECKING && (GCC_VERSION >= 2007)
 190
 191 void
 192 varray_check_failed (varray_type va, size_t n, const char *file, int line,
 193                      const char *function)
 194 {
 195   internal_error ("virtual array %s[%lu]: element %lu out of bounds "
 196                   "in %s, at %s:%d",
 197                   va->name, (unsigned long) va->num_elements, (unsigned long) n,
 198                   function, trim_filename (file), line);
 199 }
 200
 201 void
 202 varray_underflow (varray_type va, const char *file, int line,
 203                   const char *function)
 204 {
 205   internal_error ("underflowed virtual array %s in %s, at %s:%d",
 206                   va->name, function, trim_filename (file), line);
 207 }
 208
 209 #endif
 210
 211
 212 /* Output per-varray statistics.  */
 213 #ifdef GATHER_STATISTICS
 214
 215 /* Used to accumulate statistics about varray sizes.  */
 216 struct output_info
 217 {
 218   int count;
 219   int size;
 220 };
 221
 222 /* Called via htab_traverse.  Output varray descriptor pointed out by SLOT
 223    and update statistics.  */
 224 static int
 225 print_statistics (void **slot, void *b)
 226 {
 227   struct varray_descriptor *d = (struct varray_descriptor *) *slot;
 228   struct output_info *i = (struct output_info *) b;
 229
 230   if (d->allocated)
 231     {
 232       fprintf (stderr, "%-21s %6d %10d %7d %7d\n", d->name,
 233                d->created, d->allocated, d->resized, d->copied);
 234       i->size += d->allocated;
 235       i->count += d->created;
 236     }
 237   return 1;
 238 }
 239 #endif
 240
 241 /* Output per-varray memory usage statistics.  */
 242 void
 243 dump_varray_statistics (void)
 244 {
 245 #ifdef GATHER_STATISTICS
 246   struct output_info info;
 247
 248   if (varray_hash)
 249     {
 250       fprintf (stderr, "\nVARRAY Kind            Count      Bytes  Resized copied\n");
 251       fprintf (stderr, "-------------------------------------------------------\n");
 252       info.count = 0;
 253       info.size = 0;
 254       htab_traverse (varray_hash, print_statistics, &info);
 255       fprintf (stderr, "-------------------------------------------------------\n");
 256       fprintf (stderr, "%-20s %7d %10d\n",
 257                "Total", info.count, info.size);
 258       fprintf (stderr, "-------------------------------------------------------\n");
 259    }
 260 #endif
 261 }