gcc/vec.c

   1 /* Vector API for GNU compiler.
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3    Contributed by Nathan Sidwell <nathan@codesourcery.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "ggc.h"
  25 #include "vec.h"
  26 #include "errors.h"
  27 #include "coretypes.h"
  28 #include "tree.h"
  29
  30 struct vec_prefix
  31 {
  32   unsigned num;
  33   unsigned alloc;
  34   void *vec[1];
  35 };
  36
  37 /* Ensure there are at least RESERVE free slots in VEC, if RESERVE >=
  38    0.  If RESERVE < 0 increase the current allocation exponentially.
  39    VEC can be NULL, to create a new vector.  */
  40
  41 void *
  42 vec_p_reserve (void *vec, int reserve MEM_STAT_DECL)
  43 {
  44   return vec_o_reserve (vec, reserve,
  45                         offsetof (struct vec_prefix, vec), sizeof (void *)
  46                         PASS_MEM_STAT);
  47 }
  48
  49 /* Ensure there are at least RESERVE free slots in VEC, if RESERVE >=
  50    0.  If RESERVE < 0, increase the current allocation exponentially.
  51    VEC can be NULL, in which case a new vector is created.  The
  52    vector's trailing array is at VEC_OFFSET offset and consistes of
  53    ELT_SIZE sized elements.  */
  54
  55 void *
  56 vec_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size
  57                MEM_STAT_DECL)
  58 {
  59   struct vec_prefix *pfx = vec;
  60   unsigned alloc = pfx ? pfx->num : 0;
  61
  62   if (reserve >= 0)
  63     alloc += reserve;
  64   else if (alloc)
  65     alloc *= 2;
  66   else
  67     alloc = 4;
  68
  69   if (pfx && pfx->alloc >= alloc)
  70     abort ();
  71
  72   vec = ggc_realloc_stat (vec, vec_offset + alloc * elt_size PASS_MEM_STAT);
  73   ((struct vec_prefix *)vec)->alloc = alloc;
  74   if (!pfx)
  75     ((struct vec_prefix *)vec)->num = 0;
  76
  77   return vec;
  78 }
  79
  80 #if ENABLE_CHECKING
  81 /* Issue a vector domain error, and then fall over.  */
  82
  83 void
  84 vec_assert_fail (const char *op, const char *struct_name,
  85                  const char *file, unsigned int line, const char *function)
  86 {
  87   internal_error ("vector %s %s domain error, in %s at %s:%u",
  88                   struct_name, op, function, trim_filename (file), line);
  89 }
  90 #endif