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