428
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1 /* This file is part of XEmacs.
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2
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3 XEmacs is free software; you can redistribute it and/or modify it
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4 under the terms of the GNU General Public License as published by the
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5 Free Software Foundation; either version 2, or (at your option) any
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6 later version.
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7
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8 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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9 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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10 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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11 for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with XEmacs; see the file COPYING. If not, write to
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15 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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16 Boston, MA 02111-1307, USA. */
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17
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18 /* Synched up with: Not in FSF. */
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19
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20 /* Debugging hooks for malloc. */
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21
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22 /* These hooks work with gmalloc to catch allocation errors.
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23 In particular, the following is trapped:
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24
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25 * Freeing the same pointer twice.
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26 * Trying to free a pointer not returned by malloc.
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27 * Trying to realloc a pointer not returned by malloc.
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28
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1204
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29 In addition, every word of every block freed is set to 0xdeadbeef
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30 (-559038737). This causes many uses of freed storage to be trapped or
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31 recognized.
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428
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32
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33 When you use this, the storage used by the last FREE_QUEUE_LIMIT
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34 calls to free() is not recycled. When you call free for the Nth
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35 time, the (N - FREE_QUEUE_LIMIT)'th block is actually recycled.
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36
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37 For these last FREE_QUEUE_LIMIT calls to free() a backtrace is
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38 saved showing where it was called from. The function
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39 find_backtrace() is provided here to be called from GDB with a
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40 pointer (such as would be passed to free()) as argument, e.g.
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41 (gdb) p/a *find_backtrace (0x234000). If SAVE_ARGS is defined,
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42 the first three arguments to each function are saved as well as the
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43 return addresses.
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44
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45 If UNMAPPED_FREE is defined, instead of setting every word of freed
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46 storage to 0xdeadbeef, every call to malloc goes on its own page(s).
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47 When free() is called, the block is read and write protected. This
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48 is very useful when debugging, since it usually generates a bus error
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49 when the deadbeef hack might only cause some garbage to be printed.
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50 However, this is too slow for everyday use, since it takes an enormous
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51 number of pages.
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52
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53
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54 Some other features that would be useful are:
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55
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56 * Checking for storage leaks.
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57 This could be done by a GC-like facility that would scan the data
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58 segment looking for pointers to allocated storage and tell you
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59 about those that are no longer referenced. This could be invoked
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60 at any time. Another possibility is to report on what allocated
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61 storage is still in use when the process is exited. Typically
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62 there will be a large amount, so this might not be very useful.
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63 */
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64
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65 #ifdef emacs
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66 #include <config.h>
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67 #include "lisp.h"
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68 #else
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69 void *malloc (size_t);
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70 #endif
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71
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72 #if !defined(HAVE_LIBMCHECK)
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73 #include <stdio.h>
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74
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75 #include "hash.h"
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76
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77 #ifdef UNMAPPED_FREE
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78 #include <sys/mman.h>
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79 #include <sys/param.h>
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80 #define ROUND_UP_TO_PAGE(i) (((i) + PAGEOFFSET) & PAGEMASK)
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81 #endif
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82
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83 #include <sys/types.h>
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84
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85 /* System function prototypes don't belong in C source files */
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86 /* extern void free (void *); */
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87
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88 static struct hash_table *pointer_table;
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89
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90 extern void (*__free_hook) (void *);
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91 extern void *(*__malloc_hook) (size_t);
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92
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93 static void *check_malloc (size_t);
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94
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95 typedef void (*fun_ptr) (void);
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96
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97 /* free_queue is not too useful without backtrace logging */
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98 #define FREE_QUEUE_LIMIT 1
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99 #define TRACE_LIMIT 20
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100
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101 typedef struct {
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102 fun_ptr return_pc;
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103 #ifdef SAVE_ARGS
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104 void *arg[3];
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105 #endif
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106 } fun_entry;
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107
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108 typedef struct {
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109 void *address;
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110 unsigned long length;
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111 } free_queue_entry;
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112
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113 static free_queue_entry free_queue[FREE_QUEUE_LIMIT];
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114
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115 static int current_free;
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116
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117 static int strict_free_check;
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118
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119 static void
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120 check_free (void *ptr)
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121 {
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122 __free_hook = 0;
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123 __malloc_hook = 0;
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124 if (!pointer_table)
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125 pointer_table = make_hash_table (max (100, FREE_QUEUE_LIMIT * 2));
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126 if (ptr != 0)
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127 {
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128 long size;
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129 #ifdef UNMAPPED_FREE
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130 unsigned long rounded_up_size;
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131 #endif
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132
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133 EMACS_INT present = (EMACS_INT) gethash (ptr, pointer_table,
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442
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134 (const void **) &size);
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428
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135
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136 if (!present)
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137 {
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138 /* This can only happen if you try to free something that didn't
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139 come from malloc */
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140 #if !defined(__linux__)
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141 /* I originally wrote: "There's really no need to drop core."
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142 I have seen the error of my ways. -slb */
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143 if (strict_free_check)
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144 abort ();
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145 #endif
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146 printf("Freeing unmalloc'ed memory at %p\n", ptr);
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147 __free_hook = check_free;
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148 __malloc_hook = check_malloc;
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149 goto end;
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150 }
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151
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152 if (size < 0)
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153 {
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154 /* This happens when you free twice */
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155 #if !defined(__linux__)
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156 /* See above comment. */
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157 if (strict_free_check)
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158 abort ();
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159 #endif
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160 printf("Freeing %p twice\n", ptr);
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161 __free_hook = check_free;
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162 __malloc_hook = check_malloc;
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163 goto end;
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164 }
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165
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166 puthash (ptr, (void *)-size, pointer_table);
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167 #ifdef UNMAPPED_FREE
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168 /* Round up size to an even number of pages. */
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169 rounded_up_size = ROUND_UP_TO_PAGE (size);
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170 /* Protect the pages freed from all access */
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171 if (strict_free_check)
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172 mprotect (ptr, rounded_up_size, PROT_NONE);
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173 #else
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174 /* Set every word in the block to 0xdeadbeef */
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175 if (strict_free_check)
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176 {
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177 unsigned long long_length = (size + (sizeof (long) - 1))
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178 / sizeof (long);
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179 unsigned long i;
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180
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181 for (i = 0; i < long_length; i++)
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182 ((unsigned long *) ptr)[i] = 0xdeadbeef;
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183 }
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184 #endif
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185 free_queue[current_free].address = ptr;
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186 free_queue[current_free].length = size;
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187
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188 current_free++;
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189 if (current_free >= FREE_QUEUE_LIMIT)
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190 current_free = 0;
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191 /* Really free this if there's something there */
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192 {
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193 void *old = free_queue[current_free].address;
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194
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195 if (old)
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196 {
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197 #ifdef UNMAPPED_FREE
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198 unsigned long old_len = free_queue[current_free].length;
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199
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200 mprotect (old, old_len, PROT_READ | PROT_WRITE | PROT_EXEC);
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201 #endif
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202 free (old);
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203 remhash (old, pointer_table);
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204 }
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205 }
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206 }
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207 __free_hook = check_free;
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208 __malloc_hook = check_malloc;
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209
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210 end:
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211 return;
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212 }
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213
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214 static void *
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215 check_malloc (size_t size)
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216 {
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217 size_t rounded_up_size;
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218 void *result;
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219
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220 __free_hook = 0;
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221 __malloc_hook = 0;
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222 if (size == 0)
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223 {
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224 result = 0;
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225 goto end;
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226 }
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227 #ifdef UNMAPPED_FREE
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228 /* Round up to an even number of pages. */
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229 rounded_up_size = ROUND_UP_TO_PAGE (size);
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230 #else
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231 rounded_up_size = size;
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232 #endif
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233 result = malloc (rounded_up_size);
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234 if (!pointer_table)
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235 pointer_table = make_hash_table (FREE_QUEUE_LIMIT * 2);
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236 puthash (result, (void *)size, pointer_table);
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237 __free_hook = check_free;
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238 __malloc_hook = check_malloc;
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239 end:
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240 return result;
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241 }
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242
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243 extern void *(*__realloc_hook) (void *, size_t);
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244
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245 #ifdef MIN
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246 #undef MIN
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247 #endif
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248 #define MIN(A, B) ((A) < (B) ? (A) : (B))
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249
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250 /* Don't optimize realloc */
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251
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252 static void *
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253 check_realloc (void * ptr, size_t size)
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254 {
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255 EMACS_INT present;
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256 size_t old_size;
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257 void *result = malloc (size);
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258
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259 if (!ptr) return result;
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442
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260 present = (EMACS_INT) gethash (ptr, pointer_table, (const void **) &old_size);
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428
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261 if (!present)
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262 {
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263 /* This can only happen by reallocing a pointer that didn't
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264 come from malloc. */
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265 #if !defined(__linux__)
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266 /* see comment in check_free(). */
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267 abort ();
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268 #endif
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269 printf("Realloc'ing unmalloc'ed pointer at %p\n", ptr);
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270 }
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271
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272 if (result == 0)
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273 goto end;
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274 memcpy (result, ptr, MIN (size, old_size));
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275 free (ptr);
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276 end:
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277 return result;
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278 }
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279
|
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280 void enable_strict_free_check (void);
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281 void
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282 enable_strict_free_check (void)
|
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283 {
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284 strict_free_check = 1;
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285 }
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286
|
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287 void disable_strict_free_check (void);
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288 void
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289 disable_strict_free_check (void)
|
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290 {
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|
291 strict_free_check = 0;
|
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292 }
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293
|
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294 /* Note: All BLOCK_INPUT stuff removed from this file because it's
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295 completely gone in XEmacs */
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296
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297 static void *
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298 block_input_malloc (size_t size);
|
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299
|
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300 static void
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301 block_input_free (void* ptr)
|
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302 {
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303 __free_hook = 0;
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304 __malloc_hook = 0;
|
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305 free (ptr);
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306 __free_hook = block_input_free;
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307 __malloc_hook = block_input_malloc;
|
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308 }
|
|
309
|
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310 static void *
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311 block_input_malloc (size_t size)
|
|
312 {
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|
313 void* result;
|
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314 __free_hook = 0;
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315 __malloc_hook = 0;
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|
316 result = malloc (size);
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317 __free_hook = block_input_free;
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318 __malloc_hook = block_input_malloc;
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319 return result;
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|
320 }
|
|
321
|
|
322
|
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323 static void *
|
|
324 block_input_realloc (void* ptr, size_t size)
|
|
325 {
|
|
326 void* result;
|
|
327 __free_hook = 0;
|
|
328 __malloc_hook = 0;
|
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329 __realloc_hook = 0;
|
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330 result = realloc (ptr, size);
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331 __free_hook = block_input_free;
|
|
332 __malloc_hook = block_input_malloc;
|
|
333 __realloc_hook = block_input_realloc;
|
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334 return result;
|
|
335 }
|
|
336
|
|
337 #ifdef emacs
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|
338
|
|
339 void disable_free_hook (void);
|
|
340 void
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|
341 disable_free_hook (void)
|
|
342 {
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|
343 __free_hook = block_input_free;
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344 __malloc_hook = block_input_malloc;
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345 __realloc_hook = block_input_realloc;
|
|
346 }
|
|
347
|
|
348 void
|
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349 init_free_hook (void)
|
|
350 {
|
|
351 __free_hook = check_free;
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|
352 __malloc_hook = check_malloc;
|
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353 __realloc_hook = check_realloc;
|
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354 current_free = 0;
|
|
355 strict_free_check = 1;
|
|
356 }
|
|
357
|
|
358 void really_free_one_entry (void *, int, int *);
|
|
359
|
|
360 DEFUN ("really-free", Freally_free, 0, 1, "P", /*
|
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361 Actually free the storage held by the free() debug hook.
|
|
362 A no-op if the free hook is disabled.
|
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363 */
|
2286
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364 (UNUSED (arg)))
|
428
|
365 {
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|
366 int count[2];
|
|
367 Lisp_Object lisp_count[2];
|
|
368
|
|
369 if ((__free_hook != 0) && pointer_table)
|
|
370 {
|
|
371 count[0] = 0;
|
|
372 count[1] = 0;
|
|
373 __free_hook = 0;
|
|
374 maphash ((maphash_function)really_free_one_entry,
|
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375 pointer_table, (void *)&count);
|
|
376 memset (free_queue, 0, sizeof (free_queue_entry) * FREE_QUEUE_LIMIT);
|
|
377 current_free = 0;
|
|
378 __free_hook = check_free;
|
793
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379 lisp_count[0] = make_int (count[0]);
|
|
380 lisp_count[1] = make_int (count[1]);
|
428
|
381 return Fcons (lisp_count[0], lisp_count[1]);
|
|
382 }
|
|
383 else
|
|
384 return Fcons (make_int (0), make_int (0));
|
|
385 }
|
|
386
|
|
387 void
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|
388 really_free_one_entry (void *key, int contents, int *countp)
|
|
389 {
|
|
390 if (contents < 0)
|
|
391 {
|
|
392 free (key);
|
|
393 #ifdef UNMAPPED_FREE
|
|
394 mprotect (key, -contents, PROT_READ | PROT_WRITE | PROT_EXEC);
|
|
395 #endif
|
|
396 remhash (key, pointer_table);
|
|
397 countp[0]++;
|
|
398 countp[1] += -contents;
|
|
399 }
|
|
400 }
|
|
401
|
|
402 void
|
|
403 syms_of_free_hook (void)
|
|
404 {
|
|
405 DEFSUBR (Freally_free);
|
|
406 }
|
|
407
|
|
408 #else
|
|
409 void (*__free_hook)(void *) = check_free;
|
|
410 void *(*__malloc_hook)(size_t) = check_malloc;
|
|
411 void *(*__realloc_hook)(void *, size_t) = check_realloc;
|
|
412 #endif
|
|
413
|
|
414 #endif /* !defined(HAVE_LIBMCHECK) */
|
|
415
|
|
416 #if defined(DEBUG_INPUT_BLOCKING) || defined (DEBUG_GCPRO)
|
|
417
|
|
418 /* Note: There is no more input blocking in XEmacs */
|
|
419 typedef enum {
|
|
420 block_type, unblock_type, totally_type,
|
|
421 gcpro1_type, gcpro2_type, gcpro3_type, gcpro4_type, gcpro5_type,
|
|
422 ungcpro_type
|
|
423 } blocktype;
|
|
424
|
|
425 struct block_input_history_struct
|
|
426 {
|
|
427 char *file;
|
|
428 int line;
|
|
429 blocktype type;
|
|
430 int value;
|
|
431 };
|
|
432
|
|
433 typedef struct block_input_history_struct block_input_history;
|
|
434
|
|
435 #endif /* DEBUG_INPUT_BLOCKING || DEBUG_GCPRO */
|
|
436
|
|
437 #ifdef DEBUG_INPUT_BLOCKING
|
|
438
|
|
439 int blhistptr;
|
|
440
|
|
441 #define BLHISTLIMIT 1000
|
|
442
|
|
443 block_input_history blhist[BLHISTLIMIT];
|
|
444
|
|
445 note_block_input (char *file, int line)
|
|
446 {
|
|
447 note_block (file, line, block_type);
|
|
448 if (interrupt_input_blocked > 2) abort();
|
|
449 }
|
|
450
|
|
451 note_unblock_input (char* file, int line)
|
|
452 {
|
|
453 note_block (file, line, unblock_type);
|
|
454 }
|
|
455
|
|
456 note_totally_unblocked (char* file, int line)
|
|
457 {
|
|
458 note_block (file, line, totally_type);
|
|
459 }
|
|
460
|
|
461 note_block (char *file, int line, blocktype type)
|
|
462 {
|
|
463 blhist[blhistptr].file = file;
|
|
464 blhist[blhistptr].line = line;
|
|
465 blhist[blhistptr].type = type;
|
|
466 blhist[blhistptr].value = interrupt_input_blocked;
|
|
467
|
|
468 blhistptr++;
|
|
469 if (blhistptr >= BLHISTLIMIT)
|
|
470 blhistptr = 0;
|
|
471 }
|
|
472
|
|
473 #endif /* DEBUG_INPUT_BLOCKING */
|
|
474
|
|
475
|
|
476 #ifdef DEBUG_GCPRO
|
|
477
|
|
478 int gcprohistptr;
|
|
479 #define GCPROHISTLIMIT 1000
|
|
480 block_input_history gcprohist[GCPROHISTLIMIT];
|
|
481
|
|
482 static void
|
|
483 log_gcpro (char *file, int line, struct gcpro *value, blocktype type)
|
|
484 {
|
|
485 if (type == ungcpro_type)
|
|
486 {
|
|
487 if (value == gcprolist) goto OK;
|
|
488 if (! gcprolist) abort ();
|
|
489 if (value == gcprolist->next) goto OK;
|
|
490 if (! gcprolist->next) abort ();
|
|
491 if (value == gcprolist->next->next) goto OK;
|
|
492 if (! gcprolist->next->next) abort ();
|
|
493 if (value == gcprolist->next->next->next) goto OK;
|
446
|
494 if (! gcprolist->next->next->next) abort ();
|
|
495 if (value == gcprolist->next->next->next->next) goto OK;
|
428
|
496 abort ();
|
|
497 OK:;
|
|
498 }
|
|
499 gcprohist[gcprohistptr].file = file;
|
|
500 gcprohist[gcprohistptr].line = line;
|
|
501 gcprohist[gcprohistptr].type = type;
|
|
502 gcprohist[gcprohistptr].value = (int) value;
|
|
503 gcprohistptr++;
|
|
504 if (gcprohistptr >= GCPROHISTLIMIT)
|
|
505 gcprohistptr = 0;
|
|
506 }
|
|
507
|
|
508 void
|
|
509 debug_gcpro1 (char *file, int line, struct gcpro *gcpro1, Lisp_Object *var)
|
|
510 {
|
|
511 gcpro1->next = gcprolist; gcpro1->var = var; gcpro1->nvars = 1;
|
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512 gcprolist = gcpro1;
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513 log_gcpro (file, line, gcpro1, gcpro1_type);
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514 }
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515
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516 void
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517 debug_gcpro2 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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518 Lisp_Object *var1, Lisp_Object *var2)
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519 {
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520 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
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521 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
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522 gcprolist = gcpro2;
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523 log_gcpro (file, line, gcpro2, gcpro2_type);
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524 }
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525
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526 void
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527 debug_gcpro3 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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528 struct gcpro *gcpro3, Lisp_Object *var1, Lisp_Object *var2,
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529 Lisp_Object *var3)
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530 {
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531 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
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532 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
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533 gcpro3->next = gcpro2; gcpro3->var = var3; gcpro3->nvars = 1;
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534 gcprolist = gcpro3;
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535 log_gcpro (file, line, gcpro3, gcpro3_type);
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536 }
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537
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538 void
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539 debug_gcpro4 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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540 struct gcpro *gcpro3, struct gcpro *gcpro4, Lisp_Object *var1,
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541 Lisp_Object *var2, Lisp_Object *var3, Lisp_Object *var4)
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542 {
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543 log_gcpro (file, line, gcpro4, gcpro4_type);
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544 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
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545 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
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546 gcpro3->next = gcpro2; gcpro3->var = var3; gcpro3->nvars = 1;
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547 gcpro4->next = gcpro3; gcpro4->var = var4; gcpro4->nvars = 1;
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548 gcprolist = gcpro4;
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|
549 }
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550
|
|
551 void
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552 debug_gcpro5 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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553 struct gcpro *gcpro3, struct gcpro *gcpro4, struct gcpro *gcpro5,
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554 Lisp_Object *var1, Lisp_Object *var2, Lisp_Object *var3,
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555 Lisp_Object *var4, Lisp_Object *var5)
|
|
556 {
|
|
557 log_gcpro (file, line, gcpro5, gcpro5_type);
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558 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
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559 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
|
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560 gcpro3->next = gcpro2; gcpro3->var = var3; gcpro3->nvars = 1;
|
|
561 gcpro4->next = gcpro3; gcpro4->var = var4; gcpro4->nvars = 1;
|
|
562 gcpro5->next = gcpro4; gcpro5->var = var5; gcpro5->nvars = 1;
|
|
563 gcprolist = gcpro5;
|
|
564 }
|
|
565
|
|
566 void
|
|
567 debug_ungcpro (char *file, int line, struct gcpro *gcpro1)
|
|
568 {
|
|
569 log_gcpro (file, line, gcpro1, ungcpro_type);
|
|
570 gcprolist = gcpro1->next;
|
|
571 }
|
|
572
|
|
573
|
|
574 /* To be called from the debugger */
|
|
575 void show_gcprohist (void);
|
|
576 void
|
|
577 show_gcprohist (void)
|
|
578 {
|
|
579 int i, j;
|
|
580 for (i = 0, j = gcprohistptr;
|
|
581 i < GCPROHISTLIMIT;
|
|
582 i++, j++)
|
|
583 {
|
|
584 if (j >= GCPROHISTLIMIT)
|
|
585 j = 0;
|
|
586 printf ("%3d %s %d %s 0x%x\n",
|
|
587 j, gcprohist[j].file, gcprohist[j].line,
|
|
588 (gcprohist[j].type == gcpro1_type ? "GCPRO1" :
|
|
589 gcprohist[j].type == gcpro2_type ? "GCPRO2" :
|
|
590 gcprohist[j].type == gcpro3_type ? "GCPRO3" :
|
|
591 gcprohist[j].type == gcpro4_type ? "GCPRO4" :
|
446
|
592 gcprohist[j].type == gcpro5_type ? "GCPRO5" :
|
428
|
593 gcprohist[j].type == ungcpro_type ? "UNGCPRO" : "???"),
|
|
594 gcprohist[j].value);
|
|
595 }
|
|
596 fflush (stdout);
|
|
597 }
|
|
598
|
|
599 #endif /* DEBUG_GCPRO */
|