gcc/varray.c

   1 /* Virtual array support.
   2    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
   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 2, 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 COPYING.  If not, write to the Free
  20    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  21    MA 02111-1307, USA.  */
  22
  23 /* This file is compiled twice: once for the generator programs
  24    once for the compiler.  */
  25 #ifdef GENERATOR_FILE
  26 #include "bconfig.h"
  27 #else
  28 #include "config.h"
  29 #endif
  30
  31 #include "system.h"
  32 #include "coretypes.h"
  33 #include "tm.h"
  34 #ifdef GENERATOR_FILE
  35 # include "errors.h"
  36 #else
  37 # include "toplev.h"
  38 #endif
  39 #include "varray.h"
  40 #include "ggc.h"
  41 #include "hashtab.h"
  42
  43 #define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))
  44
  45 #ifdef GATHER_STATISTICS
  46
  47 /* Store information about each particular varray.  */
  48 struct varray_descriptor
  49 {
  50   const char *name;
  51   int allocated;
  52   int created;
  53   int resized;
  54   int copied;
  55 };
  56
  57 /* Hashtable mapping varray names to descriptors.  */
  58 static htab_t varray_hash;
  59
  60 /* Hashtable helpers.  */
  61 static hashval_t
  62 hash_descriptor (const void *p)
  63 {
  64   const struct varray_descriptor *d = p;
  65   return htab_hash_pointer (d->name);
  66 }
  67 static int
  68 eq_descriptor (const void *p1, const void *p2)
  69 {
  70   const struct varray_descriptor *d = p1;
  71   return d->name == p2;
  72 }
  73
  74 /* For given name, return descriptor, create new if needed.  */
  75 static struct varray_descriptor *
  76 varray_descriptor (const char *name)
  77 {
  78   struct varray_descriptor **slot;
  79
  80   if (!varray_hash)
  81     varray_hash = htab_create (10, hash_descriptor, eq_descriptor, NULL);
  82
  83   slot = (struct varray_descriptor **)
  84     htab_find_slot_with_hash (varray_hash, name,
  85                               htab_hash_pointer (name),
  86                               1);
  87   if (*slot)
  88     return *slot;
  89   *slot = xcalloc (sizeof (**slot), 1);
  90   (*slot)->name = name;
  91   return *slot;
  92 }
  93 #endif
  94
  95 /* Do not add any more non-GC items here.  Please either remove or GC
  96    those items that are not GCed.  */
  97
  98 static const struct {
  99   unsigned char size;
 100   bool uses_ggc;
 101 } element[NUM_VARRAY_DATA] = {
 102   { sizeof (char), 1 },
 103   { sizeof (unsigned char), 1 },
 104   { sizeof (short), 1 },
 105   { sizeof (unsigned short), 1 },
 106   { sizeof (int), 1 },
 107   { sizeof (unsigned int), 1 },
 108   { sizeof (long), 1 },
 109   { sizeof (unsigned long), 1 },
 110   { sizeof (HOST_WIDE_INT), 1 },
 111   { sizeof (unsigned HOST_WIDE_INT), 1 },
 112   { sizeof (void *), 1 },
 113   { sizeof (void *), 0 },
 114   { sizeof (char *), 1 },
 115   { sizeof (struct rtx_def *), 1 },
 116   { sizeof (struct rtvec_def *), 1 },
 117   { sizeof (union tree_node *), 1 },
 118   { sizeof (struct bitmap_head_def *), 1 },
 119   { sizeof (struct reg_info_def *), 0 },
 120   { sizeof (struct basic_block_def *), 1 },
 121   { sizeof (struct elt_list *), 1 },
 122   { sizeof (struct edge_def *), 1 },
 123   { sizeof (tree *), 1 },
 124 };
 125
 126 /* Allocate a virtual array with NUM_ELEMENT elements, each of which is
 127    ELEMENT_SIZE bytes long, named NAME.  Array elements are zeroed.  */
 128 varray_type
 129 varray_init (size_t num_elements, enum varray_data_enum element_kind,
 130              const char *name)
 131 {
 132   size_t data_size = num_elements * element[element_kind].size;
 133   varray_type ptr;
 134 #ifdef GATHER_STATISTICS
 135   struct varray_descriptor *desc = varray_descriptor (name);
 136
 137   desc->created++;
 138   desc->allocated += data_size + VARRAY_HDR_SIZE;
 139 #endif
 140   if (element[element_kind].uses_ggc)
 141     ptr = ggc_alloc_cleared (VARRAY_HDR_SIZE + data_size);
 142   else
 143     ptr = xcalloc (VARRAY_HDR_SIZE + data_size, 1);
 144
 145   ptr->num_elements = num_elements;
 146   ptr->elements_used = 0;
 147   ptr->type = element_kind;
 148   ptr->name = name;
 149   return ptr;
 150 }
 151
 152 /* Grow/shrink the virtual array VA to N elements.  Zero any new elements
 153    allocated.  */
 154 varray_type
 155 varray_grow (varray_type va, size_t n)
 156 {
 157   size_t old_elements = va->num_elements;
 158   if (n != old_elements)
 159     {
 160       size_t elem_size = element[va->type].size;
 161       size_t old_data_size = old_elements * elem_size;
 162       size_t data_size = n * elem_size;
 163 #ifdef GATHER_STATISTICS
 164       struct varray_descriptor *desc = varray_descriptor (va->name);
 165       varray_type oldva = va;
 166
 167       if (data_size > old_data_size)
 168         desc->allocated += data_size - old_data_size;
 169       desc->resized ++;
 170 #endif
 171
 172
 173       if (element[va->type].uses_ggc)
 174         va = ggc_realloc (va, VARRAY_HDR_SIZE + data_size);
 175       else
 176         va = xrealloc (va, VARRAY_HDR_SIZE + data_size);
 177       va->num_elements = n;
 178       if (n > old_elements)
 179         memset (&va->data.c[old_data_size], 0, data_size - old_data_size);
 180 #ifdef GATHER_STATISTICS
 181       if (oldva != va)
 182         desc->copied++;
 183 #endif
 184     }
 185
 186   return va;
 187 }
 188
 189 /* Reset a varray to its original state.  */
 190 void
 191 varray_clear (varray_type va)
 192 {
 193   size_t data_size = element[va->type].size * va->num_elements;
 194
 195   memset (va->data.c, 0, data_size);
 196   va->elements_used = 0;
 197 }
 198
 199 /* Check the bounds of a varray access.  */
 200
 201 #if defined ENABLE_CHECKING && (GCC_VERSION >= 2007)
 202
 203 void
 204 varray_check_failed (varray_type va, size_t n, const char *file, int line,
 205                      const char *function)
 206 {
 207   internal_error ("virtual array %s[%lu]: element %lu out of bounds "
 208                   "in %s, at %s:%d",
 209                   va->name, (unsigned long) va->num_elements, (unsigned long) n,
 210                   function, trim_filename (file), line);
 211 }
 212
 213 void
 214 varray_underflow (varray_type va, const char *file, int line,
 215                   const char *function)
 216 {
 217   internal_error ("underflowed virtual array %s in %s, at %s:%d",
 218                   va->name, function, trim_filename (file), line);
 219 }
 220
 221 #endif
 222
 223
 224 /* Output per-varray statistics.  */
 225 #ifdef GATHER_STATISTICS
 226
 227 /* Used to accumulate statistics about varray sizes.  */
 228 struct output_info
 229 {
 230   int count;
 231   int size;
 232 };
 233
 234 /* Called via htab_traverse.  Output varray descriptor pointed out by SLOT
 235    and update statistics.  */
 236 static int
 237 print_statistics (void **slot, void *b)
 238 {
 239   struct varray_descriptor *d = (struct varray_descriptor *) *slot;
 240   struct output_info *i = (struct output_info *) b;
 241
 242   if (d->allocated)
 243     {
 244       fprintf (stderr, "%-21s %6d %10d %7d %7d\n", d->name,
 245                d->created, d->allocated, d->resized, d->copied);
 246       i->size += d->allocated;
 247       i->count += d->created;
 248     }
 249   return 1;
 250 }
 251 #endif
 252
 253 /* Output per-varray memory usage statistics.  */
 254 void dump_varray_statistics (void)
 255 {
 256 #ifdef GATHER_STATISTICS
 257   struct output_info info;
 258
 259   fprintf (stderr, "\nVARRAY Kind            Count      Bytes  Resized copied\n");
 260   fprintf (stderr, "-------------------------------------------------------\n");
 261   info.count = 0;
 262   info.size = 0;
 263   htab_traverse (varray_hash, print_statistics, &info);
 264   fprintf (stderr, "-------------------------------------------------------\n");
 265   fprintf (stderr, "%-20s %7d %10d\n",
 266            "Total", info.count, info.size);
 267   fprintf (stderr, "-------------------------------------------------------\n");
 268 #endif
 269 }