gdb/alloc.c

   1 /* Shared allocation functions for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2024 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file is unusual.
  21
  22    Because both libiberty and readline define xmalloc and friends, the
  23    functions in this file can't appear in a library -- that will cause
  24    link errors.
  25
  26    And, because we want to turn the common code into a library, this
  27    file can't live there.
  28
  29    So, it lives in gdb and is built separately by gdb and gdbserver.
  30    Please be aware of this when modifying it.  */
  31
  32
  33 #include "libiberty.h"
  34 #include "gdbsupport/errors.h"
  35
  36 /* The xmalloc() (libiberty.h) family of memory management routines.
  37
  38    These are like the ISO-C malloc() family except that they implement
  39    consistent semantics and guard against typical memory management
  40    problems.  */
  41
  42 void *
  43 xmalloc (size_t size)
  44 {
  45   void *val;
  46
  47   /* See libiberty/xmalloc.c.  This function need's to match that's
  48      semantics.  It never returns NULL.  */
  49   if (size == 0)
  50     size = 1;
  51
  52   val = malloc (size);         /* ARI: malloc */
  53   if (val == NULL)
  54     malloc_failure (size);
  55
  56   return val;
  57 }
  58
  59 void *
  60 xrealloc (void *ptr, size_t size)
  61 {
  62   void *val;
  63
  64   /* See libiberty/xmalloc.c.  This function need's to match that's
  65      semantics.  It never returns NULL.  */
  66   if (size == 0)
  67     size = 1;
  68
  69   if (ptr != NULL)
  70     val = realloc (ptr, size);  /* ARI: realloc */
  71   else
  72     val = malloc (size);                /* ARI: malloc */
  73   if (val == NULL)
  74     malloc_failure (size);
  75
  76   return val;
  77 }
  78
  79 void *
  80 xcalloc (size_t number, size_t size)
  81 {
  82   void *mem;
  83
  84   /* See libiberty/xmalloc.c.  This function need's to match that's
  85      semantics.  It never returns NULL.  */
  86   if (number == 0 || size == 0)
  87     {
  88       number = 1;
  89       size = 1;
  90     }
  91
  92   mem = calloc (number, size);      /* ARI: xcalloc */
  93   if (mem == NULL)
  94     malloc_failure (number * size);
  95
  96   return mem;
  97 }
  98
  99 void
 100 xmalloc_failed (size_t size)
 101 {
 102   malloc_failure (size);
 103 }