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
|
|
88 static struct hash_table *pointer_table;
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89
|
|
90 extern void (*__free_hook) (void *);
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91 extern void *(*__malloc_hook) (size_t);
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92
|
|
93 static void *check_malloc (size_t);
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94
|
|
95 typedef void (*fun_ptr) (void);
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|
96
|
|
97 /* free_queue is not too useful without backtrace logging */
|
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98 #define FREE_QUEUE_LIMIT 1
|
|
99 #define TRACE_LIMIT 20
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100
|
|
101 typedef struct {
|
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102 fun_ptr return_pc;
|
|
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;
|
|
107
|
|
108 typedef struct {
|
|
109 void *address;
|
|
110 unsigned long length;
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|
111 } free_queue_entry;
|
|
112
|
|
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
|
|
117 static int strict_free_check;
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|
118
|
|
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;
|
|
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;
|
|
129 #ifdef UNMAPPED_FREE
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|
130 unsigned long rounded_up_size;
|
|
131 #endif
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132
|
|
133 EMACS_INT present = (EMACS_INT) gethash (ptr, pointer_table,
|
2519
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134 (const void **)
|
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135 (void *) &size);
|
428
|
136
|
|
137 if (!present)
|
|
138 {
|
|
139 /* This can only happen if you try to free something that didn't
|
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140 come from malloc */
|
|
141 #if !defined(__linux__)
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142 /* I originally wrote: "There's really no need to drop core."
|
|
143 I have seen the error of my ways. -slb */
|
|
144 if (strict_free_check)
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2500
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145 ABORT ();
|
428
|
146 #endif
|
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147 printf("Freeing unmalloc'ed memory at %p\n", ptr);
|
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148 __free_hook = check_free;
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149 __malloc_hook = check_malloc;
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150 goto end;
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151 }
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152
|
|
153 if (size < 0)
|
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154 {
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155 /* This happens when you free twice */
|
|
156 #if !defined(__linux__)
|
|
157 /* See above comment. */
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158 if (strict_free_check)
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2500
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159 ABORT ();
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428
|
160 #endif
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161 printf("Freeing %p twice\n", ptr);
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162 __free_hook = check_free;
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163 __malloc_hook = check_malloc;
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164 goto end;
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165 }
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166
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|
167 puthash (ptr, (void *)-size, pointer_table);
|
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168 #ifdef UNMAPPED_FREE
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169 /* Round up size to an even number of pages. */
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170 rounded_up_size = ROUND_UP_TO_PAGE (size);
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171 /* Protect the pages freed from all access */
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172 if (strict_free_check)
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173 mprotect (ptr, rounded_up_size, PROT_NONE);
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174 #else
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175 /* Set every word in the block to 0xdeadbeef */
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176 if (strict_free_check)
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177 {
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178 unsigned long long_length = (size + (sizeof (long) - 1))
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179 / sizeof (long);
|
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180 unsigned long i;
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181
|
3988
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182 /* Not using the DEADBEEF_CONSTANT #define, since we don't know
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183 * that allocation sizes will be multiples of eight. */
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428
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184 for (i = 0; i < long_length; i++)
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185 ((unsigned long *) ptr)[i] = 0xdeadbeef;
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|
186 }
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187 #endif
|
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188 free_queue[current_free].address = ptr;
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189 free_queue[current_free].length = size;
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190
|
|
191 current_free++;
|
|
192 if (current_free >= FREE_QUEUE_LIMIT)
|
|
193 current_free = 0;
|
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194 /* Really free this if there's something there */
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195 {
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|
196 void *old = free_queue[current_free].address;
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197
|
|
198 if (old)
|
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199 {
|
|
200 #ifdef UNMAPPED_FREE
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|
201 unsigned long old_len = free_queue[current_free].length;
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202
|
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203 mprotect (old, old_len, PROT_READ | PROT_WRITE | PROT_EXEC);
|
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204 #endif
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205 free (old);
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206 remhash (old, pointer_table);
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|
207 }
|
|
208 }
|
|
209 }
|
|
210 __free_hook = check_free;
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|
211 __malloc_hook = check_malloc;
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212
|
|
213 end:
|
|
214 return;
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|
215 }
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|
216
|
|
217 static void *
|
|
218 check_malloc (size_t size)
|
|
219 {
|
|
220 size_t rounded_up_size;
|
|
221 void *result;
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|
222
|
|
223 __free_hook = 0;
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224 __malloc_hook = 0;
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225 if (size == 0)
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|
226 {
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|
227 result = 0;
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|
228 goto end;
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|
229 }
|
|
230 #ifdef UNMAPPED_FREE
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231 /* Round up to an even number of pages. */
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232 rounded_up_size = ROUND_UP_TO_PAGE (size);
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233 #else
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234 rounded_up_size = size;
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235 #endif
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236 result = malloc (rounded_up_size);
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237 if (!pointer_table)
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238 pointer_table = make_hash_table (FREE_QUEUE_LIMIT * 2);
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239 puthash (result, (void *)size, pointer_table);
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|
240 __free_hook = check_free;
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|
241 __malloc_hook = check_malloc;
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242 end:
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|
243 return result;
|
|
244 }
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|
245
|
|
246 extern void *(*__realloc_hook) (void *, size_t);
|
|
247
|
|
248 #ifdef MIN
|
|
249 #undef MIN
|
|
250 #endif
|
|
251 #define MIN(A, B) ((A) < (B) ? (A) : (B))
|
|
252
|
|
253 /* Don't optimize realloc */
|
|
254
|
|
255 static void *
|
|
256 check_realloc (void * ptr, size_t size)
|
|
257 {
|
|
258 EMACS_INT present;
|
|
259 size_t old_size;
|
|
260 void *result = malloc (size);
|
|
261
|
|
262 if (!ptr) return result;
|
442
|
263 present = (EMACS_INT) gethash (ptr, pointer_table, (const void **) &old_size);
|
428
|
264 if (!present)
|
|
265 {
|
|
266 /* This can only happen by reallocing a pointer that didn't
|
|
267 come from malloc. */
|
|
268 #if !defined(__linux__)
|
|
269 /* see comment in check_free(). */
|
2500
|
270 ABORT ();
|
428
|
271 #endif
|
|
272 printf("Realloc'ing unmalloc'ed pointer at %p\n", ptr);
|
|
273 }
|
|
274
|
|
275 if (result == 0)
|
|
276 goto end;
|
|
277 memcpy (result, ptr, MIN (size, old_size));
|
|
278 free (ptr);
|
|
279 end:
|
|
280 return result;
|
|
281 }
|
|
282
|
|
283 void enable_strict_free_check (void);
|
|
284 void
|
|
285 enable_strict_free_check (void)
|
|
286 {
|
|
287 strict_free_check = 1;
|
|
288 }
|
|
289
|
|
290 void disable_strict_free_check (void);
|
|
291 void
|
|
292 disable_strict_free_check (void)
|
|
293 {
|
|
294 strict_free_check = 0;
|
|
295 }
|
|
296
|
|
297 /* Note: All BLOCK_INPUT stuff removed from this file because it's
|
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298 completely gone in XEmacs */
|
|
299
|
|
300 static void *
|
|
301 block_input_malloc (size_t size);
|
|
302
|
|
303 static void
|
|
304 block_input_free (void* ptr)
|
|
305 {
|
|
306 __free_hook = 0;
|
|
307 __malloc_hook = 0;
|
|
308 free (ptr);
|
|
309 __free_hook = block_input_free;
|
|
310 __malloc_hook = block_input_malloc;
|
|
311 }
|
|
312
|
|
313 static void *
|
|
314 block_input_malloc (size_t size)
|
|
315 {
|
|
316 void* result;
|
|
317 __free_hook = 0;
|
|
318 __malloc_hook = 0;
|
|
319 result = malloc (size);
|
|
320 __free_hook = block_input_free;
|
|
321 __malloc_hook = block_input_malloc;
|
|
322 return result;
|
|
323 }
|
|
324
|
|
325
|
|
326 static void *
|
|
327 block_input_realloc (void* ptr, size_t size)
|
|
328 {
|
|
329 void* result;
|
|
330 __free_hook = 0;
|
|
331 __malloc_hook = 0;
|
|
332 __realloc_hook = 0;
|
|
333 result = realloc (ptr, size);
|
|
334 __free_hook = block_input_free;
|
|
335 __malloc_hook = block_input_malloc;
|
|
336 __realloc_hook = block_input_realloc;
|
|
337 return result;
|
|
338 }
|
|
339
|
|
340 #ifdef emacs
|
|
341
|
|
342 void disable_free_hook (void);
|
|
343 void
|
|
344 disable_free_hook (void)
|
|
345 {
|
|
346 __free_hook = block_input_free;
|
|
347 __malloc_hook = block_input_malloc;
|
|
348 __realloc_hook = block_input_realloc;
|
|
349 }
|
|
350
|
|
351 void
|
|
352 init_free_hook (void)
|
|
353 {
|
|
354 __free_hook = check_free;
|
|
355 __malloc_hook = check_malloc;
|
|
356 __realloc_hook = check_realloc;
|
|
357 current_free = 0;
|
|
358 strict_free_check = 1;
|
|
359 }
|
|
360
|
|
361 void really_free_one_entry (void *, int, int *);
|
|
362
|
|
363 DEFUN ("really-free", Freally_free, 0, 1, "P", /*
|
|
364 Actually free the storage held by the free() debug hook.
|
|
365 A no-op if the free hook is disabled.
|
|
366 */
|
2286
|
367 (UNUSED (arg)))
|
428
|
368 {
|
|
369 int count[2];
|
|
370 Lisp_Object lisp_count[2];
|
|
371
|
|
372 if ((__free_hook != 0) && pointer_table)
|
|
373 {
|
|
374 count[0] = 0;
|
|
375 count[1] = 0;
|
|
376 __free_hook = 0;
|
|
377 maphash ((maphash_function)really_free_one_entry,
|
|
378 pointer_table, (void *)&count);
|
|
379 memset (free_queue, 0, sizeof (free_queue_entry) * FREE_QUEUE_LIMIT);
|
|
380 current_free = 0;
|
|
381 __free_hook = check_free;
|
793
|
382 lisp_count[0] = make_int (count[0]);
|
|
383 lisp_count[1] = make_int (count[1]);
|
428
|
384 return Fcons (lisp_count[0], lisp_count[1]);
|
|
385 }
|
|
386 else
|
|
387 return Fcons (make_int (0), make_int (0));
|
|
388 }
|
|
389
|
|
390 void
|
|
391 really_free_one_entry (void *key, int contents, int *countp)
|
|
392 {
|
|
393 if (contents < 0)
|
|
394 {
|
|
395 free (key);
|
|
396 #ifdef UNMAPPED_FREE
|
|
397 mprotect (key, -contents, PROT_READ | PROT_WRITE | PROT_EXEC);
|
|
398 #endif
|
|
399 remhash (key, pointer_table);
|
|
400 countp[0]++;
|
|
401 countp[1] += -contents;
|
|
402 }
|
|
403 }
|
|
404
|
|
405 void
|
|
406 syms_of_free_hook (void)
|
|
407 {
|
|
408 DEFSUBR (Freally_free);
|
|
409 }
|
|
410
|
|
411 #else
|
|
412 void (*__free_hook)(void *) = check_free;
|
|
413 void *(*__malloc_hook)(size_t) = check_malloc;
|
|
414 void *(*__realloc_hook)(void *, size_t) = check_realloc;
|
|
415 #endif
|
|
416
|
|
417 #endif /* !defined(HAVE_LIBMCHECK) */
|
|
418
|
|
419 #if defined(DEBUG_INPUT_BLOCKING) || defined (DEBUG_GCPRO)
|
|
420
|
|
421 /* Note: There is no more input blocking in XEmacs */
|
|
422 typedef enum {
|
|
423 block_type, unblock_type, totally_type,
|
|
424 gcpro1_type, gcpro2_type, gcpro3_type, gcpro4_type, gcpro5_type,
|
|
425 ungcpro_type
|
|
426 } blocktype;
|
|
427
|
|
428 struct block_input_history_struct
|
|
429 {
|
|
430 char *file;
|
|
431 int line;
|
|
432 blocktype type;
|
|
433 int value;
|
|
434 };
|
|
435
|
|
436 typedef struct block_input_history_struct block_input_history;
|
|
437
|
|
438 #endif /* DEBUG_INPUT_BLOCKING || DEBUG_GCPRO */
|
|
439
|
|
440 #ifdef DEBUG_INPUT_BLOCKING
|
|
441
|
|
442 int blhistptr;
|
|
443
|
|
444 #define BLHISTLIMIT 1000
|
|
445
|
|
446 block_input_history blhist[BLHISTLIMIT];
|
|
447
|
|
448 note_block_input (char *file, int line)
|
|
449 {
|
|
450 note_block (file, line, block_type);
|
2500
|
451 if (interrupt_input_blocked > 2) ABORT();
|
428
|
452 }
|
|
453
|
|
454 note_unblock_input (char* file, int line)
|
|
455 {
|
|
456 note_block (file, line, unblock_type);
|
|
457 }
|
|
458
|
|
459 note_totally_unblocked (char* file, int line)
|
|
460 {
|
|
461 note_block (file, line, totally_type);
|
|
462 }
|
|
463
|
|
464 note_block (char *file, int line, blocktype type)
|
|
465 {
|
|
466 blhist[blhistptr].file = file;
|
|
467 blhist[blhistptr].line = line;
|
|
468 blhist[blhistptr].type = type;
|
|
469 blhist[blhistptr].value = interrupt_input_blocked;
|
|
470
|
|
471 blhistptr++;
|
|
472 if (blhistptr >= BLHISTLIMIT)
|
|
473 blhistptr = 0;
|
|
474 }
|
|
475
|
|
476 #endif /* DEBUG_INPUT_BLOCKING */
|
|
477
|
|
478
|
|
479 #ifdef DEBUG_GCPRO
|
|
480
|
|
481 int gcprohistptr;
|
|
482 #define GCPROHISTLIMIT 1000
|
|
483 block_input_history gcprohist[GCPROHISTLIMIT];
|
|
484
|
|
485 static void
|
|
486 log_gcpro (char *file, int line, struct gcpro *value, blocktype type)
|
|
487 {
|
|
488 if (type == ungcpro_type)
|
|
489 {
|
|
490 if (value == gcprolist) goto OK;
|
2500
|
491 if (! gcprolist) ABORT ();
|
428
|
492 if (value == gcprolist->next) goto OK;
|
2500
|
493 if (! gcprolist->next) ABORT ();
|
428
|
494 if (value == gcprolist->next->next) goto OK;
|
2500
|
495 if (! gcprolist->next->next) ABORT ();
|
428
|
496 if (value == gcprolist->next->next->next) goto OK;
|
2500
|
497 if (! gcprolist->next->next->next) ABORT ();
|
446
|
498 if (value == gcprolist->next->next->next->next) goto OK;
|
2500
|
499 ABORT ();
|
428
|
500 OK:;
|
|
501 }
|
|
502 gcprohist[gcprohistptr].file = file;
|
|
503 gcprohist[gcprohistptr].line = line;
|
|
504 gcprohist[gcprohistptr].type = type;
|
|
505 gcprohist[gcprohistptr].value = (int) value;
|
|
506 gcprohistptr++;
|
|
507 if (gcprohistptr >= GCPROHISTLIMIT)
|
|
508 gcprohistptr = 0;
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509 }
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510
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511 void
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512 debug_gcpro1 (char *file, int line, struct gcpro *gcpro1, Lisp_Object *var)
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513 {
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514 gcpro1->next = gcprolist; gcpro1->var = var; gcpro1->nvars = 1;
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515 gcprolist = gcpro1;
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516 log_gcpro (file, line, gcpro1, gcpro1_type);
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517 }
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518
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519 void
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520 debug_gcpro2 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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521 Lisp_Object *var1, Lisp_Object *var2)
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522 {
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523 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
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524 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
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525 gcprolist = gcpro2;
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526 log_gcpro (file, line, gcpro2, gcpro2_type);
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527 }
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528
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529 void
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530 debug_gcpro3 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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531 struct gcpro *gcpro3, Lisp_Object *var1, Lisp_Object *var2,
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532 Lisp_Object *var3)
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533 {
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534 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
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535 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
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536 gcpro3->next = gcpro2; gcpro3->var = var3; gcpro3->nvars = 1;
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537 gcprolist = gcpro3;
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538 log_gcpro (file, line, gcpro3, gcpro3_type);
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539 }
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540
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541 void
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542 debug_gcpro4 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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543 struct gcpro *gcpro3, struct gcpro *gcpro4, Lisp_Object *var1,
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544 Lisp_Object *var2, Lisp_Object *var3, Lisp_Object *var4)
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545 {
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546 log_gcpro (file, line, gcpro4, gcpro4_type);
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|
547 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
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548 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
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549 gcpro3->next = gcpro2; gcpro3->var = var3; gcpro3->nvars = 1;
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550 gcpro4->next = gcpro3; gcpro4->var = var4; gcpro4->nvars = 1;
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551 gcprolist = gcpro4;
|
|
552 }
|
|
553
|
|
554 void
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|
555 debug_gcpro5 (char *file, int line, struct gcpro *gcpro1, struct gcpro *gcpro2,
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556 struct gcpro *gcpro3, struct gcpro *gcpro4, struct gcpro *gcpro5,
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557 Lisp_Object *var1, Lisp_Object *var2, Lisp_Object *var3,
|
|
558 Lisp_Object *var4, Lisp_Object *var5)
|
|
559 {
|
|
560 log_gcpro (file, line, gcpro5, gcpro5_type);
|
|
561 gcpro1->next = gcprolist; gcpro1->var = var1; gcpro1->nvars = 1;
|
|
562 gcpro2->next = gcpro1; gcpro2->var = var2; gcpro2->nvars = 1;
|
|
563 gcpro3->next = gcpro2; gcpro3->var = var3; gcpro3->nvars = 1;
|
|
564 gcpro4->next = gcpro3; gcpro4->var = var4; gcpro4->nvars = 1;
|
|
565 gcpro5->next = gcpro4; gcpro5->var = var5; gcpro5->nvars = 1;
|
|
566 gcprolist = gcpro5;
|
|
567 }
|
|
568
|
|
569 void
|
|
570 debug_ungcpro (char *file, int line, struct gcpro *gcpro1)
|
|
571 {
|
|
572 log_gcpro (file, line, gcpro1, ungcpro_type);
|
|
573 gcprolist = gcpro1->next;
|
|
574 }
|
|
575
|
|
576
|
|
577 /* To be called from the debugger */
|
|
578 void show_gcprohist (void);
|
|
579 void
|
|
580 show_gcprohist (void)
|
|
581 {
|
|
582 int i, j;
|
|
583 for (i = 0, j = gcprohistptr;
|
|
584 i < GCPROHISTLIMIT;
|
|
585 i++, j++)
|
|
586 {
|
|
587 if (j >= GCPROHISTLIMIT)
|
|
588 j = 0;
|
|
589 printf ("%3d %s %d %s 0x%x\n",
|
|
590 j, gcprohist[j].file, gcprohist[j].line,
|
|
591 (gcprohist[j].type == gcpro1_type ? "GCPRO1" :
|
|
592 gcprohist[j].type == gcpro2_type ? "GCPRO2" :
|
|
593 gcprohist[j].type == gcpro3_type ? "GCPRO3" :
|
|
594 gcprohist[j].type == gcpro4_type ? "GCPRO4" :
|
446
|
595 gcprohist[j].type == gcpro5_type ? "GCPRO5" :
|
428
|
596 gcprohist[j].type == ungcpro_type ? "UNGCPRO" : "???"),
|
|
597 gcprohist[j].value);
|
|
598 }
|
|
599 fflush (stdout);
|
|
600 }
|
|
601
|
|
602 #endif /* DEBUG_GCPRO */
|