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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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29 In addition, every word of every block freed is set to
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30 0xdeadbeef. This causes many uses of freed storage to be
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31 trapped or recognized.
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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 }
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309
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310 static void *
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311 block_input_malloc (size_t size)
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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 }
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321
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322
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323 static void *
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324 block_input_realloc (void* ptr, size_t size)
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325 {
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326 void* result;
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327 __free_hook = 0;
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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;
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332 __malloc_hook = block_input_malloc;
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333 __realloc_hook = block_input_realloc;
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334 return result;
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335 }
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336
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337 #ifdef emacs
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338
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339 void disable_free_hook (void);
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340 void
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341 disable_free_hook (void)
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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;
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346 }
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347
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348 void
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349 init_free_hook (void)
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350 {
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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;
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355 strict_free_check = 1;
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356 }
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357
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358 void really_free_one_entry (void *, int, int *);
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359
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360 DEFUN ("really-free", Freally_free, 0, 1, "P", /*
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361 Actually free the storage held by the free() debug hook.
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362 A no-op if the free hook is disabled.
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363 */
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364 (arg))
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365 {
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366 int count[2];
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367 Lisp_Object lisp_count[2];
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368
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369 if ((__free_hook != 0) && pointer_table)
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370 {
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371 count[0] = 0;
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372 count[1] = 0;
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373 __free_hook = 0;
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374 maphash ((maphash_function)really_free_one_entry,
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375 pointer_table, (void *)&count);
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376 memset (free_queue, 0, sizeof (free_queue_entry) * FREE_QUEUE_LIMIT);
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377 current_free = 0;
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378 __free_hook = check_free;
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379 XSETINT (lisp_count[0], count[0]);
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380 XSETINT (lisp_count[1], count[1]);
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381 return Fcons (lisp_count[0], lisp_count[1]);
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382 }
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383 else
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384 return Fcons (make_int (0), make_int (0));
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385 }
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386
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387 void
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388 really_free_one_entry (void *key, int contents, int *countp)
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389 {
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390 if (contents < 0)
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391 {
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392 free (key);
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393 #ifdef UNMAPPED_FREE
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394 mprotect (key, -contents, PROT_READ | PROT_WRITE | PROT_EXEC);
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395 #endif
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396 remhash (key, pointer_table);
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397 countp[0]++;
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398 countp[1] += -contents;
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399 }
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400 }
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401
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402 void
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403 syms_of_free_hook (void)
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404 {
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405 DEFSUBR (Freally_free);
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406 }
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407
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408 #else
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409 void (*__free_hook)(void *) = check_free;
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410 void *(*__malloc_hook)(size_t) = check_malloc;
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411 void *(*__realloc_hook)(void *, size_t) = check_realloc;
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412 #endif
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413
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414 #endif /* !defined(HAVE_LIBMCHECK) */
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415
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416 #if defined(DEBUG_INPUT_BLOCKING) || defined (DEBUG_GCPRO)
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417
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418 /* Note: There is no more input blocking in XEmacs */
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|
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419 typedef enum {
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420 block_type, unblock_type, totally_type,
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421 gcpro1_type, gcpro2_type, gcpro3_type, gcpro4_type, gcpro5_type,
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422 ungcpro_type
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|
423 } blocktype;
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424
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425 struct block_input_history_struct
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|
|
426 {
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427 char *file;
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|
|
428 int line;
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|
|
429 blocktype type;
|
|
|
430 int value;
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431 };
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432
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433 typedef struct block_input_history_struct block_input_history;
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434
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435 #endif /* DEBUG_INPUT_BLOCKING || DEBUG_GCPRO */
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436
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437 #ifdef DEBUG_INPUT_BLOCKING
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438
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439 int blhistptr;
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440
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441 #define BLHISTLIMIT 1000
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442
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443 block_input_history blhist[BLHISTLIMIT];
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444
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445 note_block_input (char *file, int line)
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446 {
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447 note_block (file, line, block_type);
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448 if (interrupt_input_blocked > 2) abort();
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449 }
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450
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451 note_unblock_input (char* file, int line)
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452 {
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453 note_block (file, line, unblock_type);
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454 }
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455
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456 note_totally_unblocked (char* file, int line)
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457 {
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458 note_block (file, line, totally_type);
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459 }
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460
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461 note_block (char *file, int line, blocktype type)
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462 {
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463 blhist[blhistptr].file = file;
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464 blhist[blhistptr].line = line;
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465 blhist[blhistptr].type = type;
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466 blhist[blhistptr].value = interrupt_input_blocked;
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467
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468 blhistptr++;
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469 if (blhistptr >= BLHISTLIMIT)
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470 blhistptr = 0;
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471 }
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472
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473 #endif /* DEBUG_INPUT_BLOCKING */
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474
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475
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476 #ifdef DEBUG_GCPRO
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477
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478 int gcprohistptr;
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479 #define GCPROHISTLIMIT 1000
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480 block_input_history gcprohist[GCPROHISTLIMIT];
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481
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482 static void
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483 log_gcpro (char *file, int line, struct gcpro *value, blocktype type)
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484 {
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485 if (type == ungcpro_type)
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486 {
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487 if (value == gcprolist) goto OK;
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488 if (! gcprolist) abort ();
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489 if (value == gcprolist->next) goto OK;
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490 if (! gcprolist->next) abort ();
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491 if (value == gcprolist->next->next) goto OK;
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492 if (! gcprolist->next->next) abort ();
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493 if (value == gcprolist->next->next->next) goto OK;
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446
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494 if (! gcprolist->next->next->next) abort ();
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495 if (value == gcprolist->next->next->next->next) goto OK;
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428
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496 abort ();
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497 OK:;
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498 }
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499 gcprohist[gcprohistptr].file = file;
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500 gcprohist[gcprohistptr].line = line;
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501 gcprohist[gcprohistptr].type = type;
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502 gcprohist[gcprohistptr].value = (int) value;
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503 gcprohistptr++;
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504 if (gcprohistptr >= GCPROHISTLIMIT)
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505 gcprohistptr = 0;
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506 }
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507
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508 void
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509 debug_gcpro1 (char *file, int line, struct gcpro *gcpro1, Lisp_Object *var)
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510 {
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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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|
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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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|
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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 {
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|
|
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;
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|
|
561 gcpro4->next = gcpro3; gcpro4->var = var4; gcpro4->nvars = 1;
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|
|
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 */
|
