Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/jbig2dec/memento.h @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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1 /* Copyright (C) 2001-2023 Artifex Software, Inc.
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2 All Rights Reserved.
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3
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4 This software is provided AS-IS with no warranty, either express or
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5 implied.
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6
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7 This software is distributed under license and may not be copied,
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8 modified or distributed except as expressly authorized under the terms
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9 of the license contained in the file LICENSE in this distribution.
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11 Refer to licensing information at http://www.artifex.com or contact
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12 Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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13 CA 94129, USA, for further information.
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14 */
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16 /* Memento: A library to aid debugging of memory leaks/heap corruption.
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17 *
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18 * Usage (with C):
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19 * First, build your project with MEMENTO defined, and include this
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20 * header file wherever you use malloc, realloc or free.
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21 * This header file will use macros to point malloc, realloc and free to
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22 * point to Memento_malloc, Memento_realloc, Memento_free.
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23 *
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24 * Run your program, and all mallocs/frees/reallocs should be redirected
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25 * through here. When the program exits, you will get a list of all the
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26 * leaked blocks, together with some helpful statistics. You can get the
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27 * same list of allocated blocks at any point during program execution by
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28 * calling Memento_listBlocks();
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29 *
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30 * Every call to malloc/free/realloc counts as an 'allocation event'.
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31 * On each event Memento increments a counter. Every block is tagged with
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32 * the current counter on allocation. Every so often during program
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33 * execution, the heap is checked for consistency. By default this happens
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34 * after 1024 events, then after 2048 events, then after 4096 events, etc.
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35 * This can be changed at runtime by using Memento_setParanoia(int level).
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36 * 0 turns off such checking, 1 sets checking to happen on every event,
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37 * any positive number n sets checking to happen once every n events,
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38 * and any negative number n sets checking to happen after -n events, then
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39 * after -2n events etc.
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40 *
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41 * The default paranoia level is therefore -1024.
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42 *
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43 * Memento keeps blocks around for a while after they have been freed, and
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44 * checks them as part of these heap checks to see if they have been
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45 * written to (or are freed twice etc).
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46 *
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47 * A given heap block can be checked for consistency (it's 'pre' and
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48 * 'post' guard blocks are checked to see if they have been written to)
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49 * by calling Memento_checkBlock(void *blockAddress);
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50 *
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51 * A check of all the memory can be triggered by calling Memento_check();
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52 * (or Memento_checkAllMemory(); if you'd like it to be quieter).
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53 *
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54 * A good place to breakpoint is Memento_breakpoint, as this will then
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55 * trigger your debugger if an error is detected. This is done
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56 * automatically for debug windows builds.
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57 *
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58 * If a block is found to be corrupt, information will be printed to the
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59 * console, including the address of the block, the size of the block,
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60 * the type of corruption, the number of the block and the event on which
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61 * it last passed a check for correctness.
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62 *
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63 * If you rerun, and call Memento_paranoidAt(int event); with this number
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64 * the code will wait until it reaches that event and then start
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65 * checking the heap after every allocation event. Assuming it is a
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66 * deterministic failure, you should then find out where in your program
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67 * the error is occurring (between event x-1 and event x).
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68 *
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69 * Then you can rerun the program again, and call
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70 * Memento_breakAt(int event); and the program will call
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71 * Memento_Breakpoint() when event x is reached, enabling you to step
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72 * through.
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73 *
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74 * Memento_find(address) will tell you what block (if any) the given
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75 * address is in.
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76 *
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77 * An example:
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78 * Suppose we have a gs invocation that crashes with memory corruption.
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79 * * Build with -DMEMENTO.
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80 * * In your debugger put a breakpoint on Memento_breakpoint.
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81 * * Run the program. It will stop in Memento_inited.
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82 * * Execute Memento_setParanoia(1); (In VS use Ctrl-Alt-Q). (Note #1)
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83 * * Continue execution.
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84 * * It will detect the memory corruption on the next allocation event
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85 * after it happens, and stop in Memento_breakpoint. The console should
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86 * show something like:
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87 *
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88 * Freed blocks:
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89 * 0x172e610(size=288,num=1415) index 256 (0x172e710) onwards corrupted
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90 * Block last checked OK at allocation 1457. Now 1458.
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91 *
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92 * * This means that the block became corrupted between allocation 1457
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93 * and 1458 - so if we rerun and stop the program at 1457, we can then
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94 * step through, possibly with a data breakpoint at 0x172e710 and see
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95 * when it occurs.
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96 * * So restart the program from the beginning. When we stop after
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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97 * initialisation execute Memento_breakAt(1457); (and maybe
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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98 * Memento_setParanoia(1), or Memento_setParanoidAt(1457))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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99 * * Continue execution until we hit Memento_breakpoint.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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100 * * Now you can step through and watch the memory corruption happen.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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101 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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102 * Note #1: Using Memento_setParanoia(1) can cause your program to run
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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103 * very slowly. You may instead choose to use Memento_setParanoia(100)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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104 * (or some other figure). This will only exhaustively check memory on
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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105 * every 100th allocation event. This trades speed for the size of the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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106 * average allocation event range in which detection of memory corruption
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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107 * occurs. You may (for example) choose to run once checking every 100
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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108 * allocations and discover that the corruption happens between events
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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109 * X and X+100. You can then rerun using Memento_paranoidAt(X), and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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110 * it'll only start exhaustively checking when it reaches X.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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111 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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112 * More than one memory allocator?
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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113 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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114 * If you have more than one memory allocator in the system (like for
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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115 * instance the ghostscript chunk allocator, that builds on top of the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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116 * standard malloc and returns chunks itself), then there are some things
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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117 * to note:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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118 *
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Franz Glasner <fzglas.hg@dom66.de>
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119 * * If the secondary allocator gets its underlying blocks from calling
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120 * malloc, then those will be checked by Memento, but 'subblocks' that
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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121 * are returned to the secondary allocator will not. There is currently
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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122 * no way to fix this other than trying to bypass the secondary
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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123 * allocator. One way I have found to do this with the chunk allocator
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 * is to tweak its idea of a 'large block' so that it puts every
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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125 * allocation in its own chunk. Clearly this negates the point of having
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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126 * a secondary allocator, and is therefore not recommended for general
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parents:
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127 * use.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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128 *
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129 * * Again, if the secondary allocator gets its underlying blocks from
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130 * calling malloc (and hence Memento) leak detection should still work
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parents:
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131 * (but whole blocks will be detected rather than subblocks).
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parents:
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132 *
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133 * * If on every allocation attempt the secondary allocator calls into
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parents:
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134 * Memento_failThisEvent(), and fails the allocation if it returns true
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135 * then more useful features can be used; firstly memory squeezing will
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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136 * work, and secondly, Memento will have a "finer grained" paranoia
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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137 * available to it.
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parents:
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138 *
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139 * Usage with C++:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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140 *
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parents:
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141 * Memento has some experimental code in it to trap new/delete (and
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 * new[]/delete[] if required) calls.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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143 *
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Franz Glasner <fzglas.hg@dom66.de>
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144 * In order for this to work, either:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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145 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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146 * 1) Build memento.c with the c++ compiler.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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147 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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148 * or
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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149 *
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parents:
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150 * 2) Build memento.c as normal with the C compiler, then from any
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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151 * one of your .cpp files, do:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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152 *
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Franz Glasner <fzglas.hg@dom66.de>
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153 * #define MEMENTO_CPP_EXTRAS_ONLY
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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154 * #include "memento.c"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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155 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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156 * In the case where MEMENTO is not defined, this will not do anything.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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157 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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158 * Both Windows and GCC provide separate new[] and delete[] operators
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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159 * for arrays. Apparently some systems do not. If this is the case for
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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160 * your system, define MEMENTO_CPP_NO_ARRAY_CONSTRUCTORS.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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161 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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162 * "libbacktrace.so failed to load"
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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163 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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164 * In order to give nice backtraces on unix, Memento will try to use
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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165 * a libbacktrace dynamic library. If it can't find it, you'll see
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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166 * that warning, and your backtraces won't include file/line information.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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167 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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168 * To fix this you'll need to build your own libbacktrace. Don't worry
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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169 * it's really easy:
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parents:
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170 * git clone git://github.com/ianlancetaylor/libbacktrace
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parents:
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171 * cd libbacktrace
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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172 * ./configure
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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173 * make
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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174 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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175 * This leaves the build .so as .libs/libbacktrace.so
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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176 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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177 * Memento will look for this on LD_LIBRARY_PATH, or in /opt/lib/,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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178 * or in /lib/, or in /usr/lib/, or in /usr/local/lib/. I recommend
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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179 * using /opt/lib/ as this won't conflict with anything that you
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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180 * get via a package manager like apt.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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181 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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182 * sudo mkdir /opt
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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183 * sudo mkdir /opt/lib
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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184 * sudo cp .libs/libbacktrace.so /opt/lib/
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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185 */
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186
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187 #ifndef MEMENTO_H
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188
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parents:
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189 #include <stdlib.h>
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190
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parents:
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191 #define MEMENTO_H
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192
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193 #ifndef MEMENTO_UNDERLYING_MALLOC
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194 #define MEMENTO_UNDERLYING_MALLOC malloc
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195 #endif
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196 #ifndef MEMENTO_UNDERLYING_FREE
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197 #define MEMENTO_UNDERLYING_FREE free
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198 #endif
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199 #ifndef MEMENTO_UNDERLYING_REALLOC
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200 #define MEMENTO_UNDERLYING_REALLOC realloc
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201 #endif
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202 #ifndef MEMENTO_UNDERLYING_CALLOC
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203 #define MEMENTO_UNDERLYING_CALLOC calloc
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204 #endif
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205
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206 #ifndef MEMENTO_MAXALIGN
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207 #define MEMENTO_MAXALIGN (sizeof(int))
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208 #endif
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209
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210 #define MEMENTO_PREFILL 0xa6
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211 #define MEMENTO_POSTFILL 0xa7
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212 #define MEMENTO_ALLOCFILL 0xa8
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213 #define MEMENTO_FREEFILL 0xa9
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214
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215 #define MEMENTO_FREELIST_MAX 0x2000000
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216
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217 int Memento_checkBlock(void *);
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218 int Memento_checkAllMemory(void);
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219 int Memento_check(void);
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220
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221 int Memento_setParanoia(int);
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222 int Memento_paranoidAt(int);
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223 int Memento_breakAt(int);
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224 void Memento_breakOnFree(void *a);
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225 void Memento_breakOnRealloc(void *a);
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226 int Memento_getBlockNum(void *);
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227 int Memento_find(void *a);
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228 void Memento_breakpoint(void);
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229 int Memento_failAt(int);
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230 int Memento_failThisEvent(void);
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231 void Memento_listBlocks(void);
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232 void Memento_listNewBlocks(void);
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233 size_t Memento_setMax(size_t);
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234 void Memento_stats(void);
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235 void *Memento_label(void *, const char *);
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236 void Memento_tick(void);
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237
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238 void *Memento_malloc(size_t s);
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239 void *Memento_realloc(void *, size_t s);
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240 void Memento_free(void *);
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241 void *Memento_calloc(size_t, size_t);
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242
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243 void Memento_info(void *addr);
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244 void Memento_listBlockInfo(void);
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245 void *Memento_takeByteRef(void *blk);
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246 void *Memento_dropByteRef(void *blk);
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247 void *Memento_takeShortRef(void *blk);
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248 void *Memento_dropShortRef(void *blk);
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249 void *Memento_takeIntRef(void *blk);
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250 void *Memento_dropIntRef(void *blk);
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251 void *Memento_takeRef(void *blk);
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252 void *Memento_dropRef(void *blk);
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253 void *Memento_adjustRef(void *blk, int adjust);
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254 void *Memento_reference(void *blk);
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255
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256 int Memento_checkPointerOrNull(void *blk);
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257 int Memento_checkBytePointerOrNull(void *blk);
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258 int Memento_checkShortPointerOrNull(void *blk);
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259 int Memento_checkIntPointerOrNull(void *blk);
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260
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261 void Memento_startLeaking(void);
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262 void Memento_stopLeaking(void);
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263
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264 int Memento_sequence(void);
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265
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266 int Memento_squeezing(void);
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267
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268 void Memento_fin(void);
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269
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270 void Memento_bt(void);
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271
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diff changeset
272 #ifdef MEMENTO
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273
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274 #ifndef COMPILING_MEMENTO_C
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275 #define malloc Memento_malloc
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276 #define free Memento_free
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277 #define realloc Memento_realloc
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278 #define calloc Memento_calloc
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diff changeset
279 #endif
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280
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diff changeset
281 #else
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282
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diff changeset
283 #define Memento_malloc MEMENTO_UNDERLYING_MALLOC
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284 #define Memento_free MEMENTO_UNDERLYING_FREE
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285 #define Memento_realloc MEMENTO_UNDERLYING_REALLOC
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286 #define Memento_calloc MEMENTO_UNDERLYING_CALLOC
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287
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288 #define Memento_checkBlock(A) 0
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289 #define Memento_checkAllMemory() 0
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290 #define Memento_check() 0
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291 #define Memento_setParanoia(A) 0
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292 #define Memento_paranoidAt(A) 0
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293 #define Memento_breakAt(A) 0
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294 #define Memento_breakOnFree(A) 0
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295 #define Memento_breakOnRealloc(A) 0
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296 #define Memento_getBlockNum(A) 0
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297 #define Memento_find(A) 0
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298 #define Memento_breakpoint() do {} while (0)
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299 #define Memento_failAt(A) 0
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300 #define Memento_failThisEvent() 0
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301 #define Memento_listBlocks() do {} while (0)
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302 #define Memento_listNewBlocks() do {} while (0)
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303 #define Memento_setMax(A) 0
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304 #define Memento_stats() do {} while (0)
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305 #define Memento_label(A,B) (A)
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306 #define Memento_info(A) do {} while (0)
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307 #define Memento_listBlockInfo() do {} while (0)
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308 #define Memento_takeByteRef(A) (A)
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309 #define Memento_dropByteRef(A) (A)
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310 #define Memento_takeShortRef(A) (A)
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311 #define Memento_dropShortRef(A) (A)
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312 #define Memento_takeIntRef(A) (A)
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313 #define Memento_dropIntRef(A) (A)
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314 #define Memento_takeRef(A) (A)
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315 #define Memento_dropRef(A) (A)
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316 #define Memento_adjustRef(A,V) (A)
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317 #define Memento_reference(A) (A)
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318 #define Memento_checkPointerOrNull(A) 0
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319 #define Memento_checkBytePointerOrNull(A) 0
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320 #define Memento_checkShortPointerOrNull(A) 0
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321 #define Memento_checkIntPointerOrNull(A) 0
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322
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323 #define Memento_tick() do {} while (0)
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324 #define Memento_startLeaking() do {} while (0)
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325 #define Memento_stopLeaking() do {} while (0)
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326 #define Memento_fin() do {} while (0)
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327 #define Memento_bt() do {} while (0)
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328 #define Memento_sequence() (0)
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329 #define Memento_squeezing() (0)
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330
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331 #endif /* MEMENTO */
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332
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333 #endif /* MEMENTO_H */