Mercurial > hg > early-roguelike
annotate urogue/memory.c @ 288:b8919055c2fc
UltraRogue: compile out the built-in memory checking.
Functions in memory.c tracked and instrumented memory allocation. This
mechanism logged information to a text file and also added a 16KB guard
area to every allocation. Neither of these are desirable in a multi-
user environment, so the whole memory tracking subsystem has been
disabled.
The behavior can be enabled with a configure flag, but it would be a
better idea to use Valgrind to deal with memory bugs.
author | John "Elwin" Edwards |
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date | Fri, 24 Nov 2017 13:22:26 -0500 |
parents | c4b12d2d1dcd |
children | e52a8a7ad4c5 |
rev | line source |
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1 /* |
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2 memory.c |
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3 |
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4 UltraRogue: The Ultimate Adventure in the Dungeons of Doom |
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5 Copyright (C) 1995 Herb Chong |
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6 All rights reserved. |
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7 |
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8 See the file LICENSE.TXT for full copyright and licensing information. |
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9 */ |
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10 |
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11 #include <stdio.h> |
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12 #include <stdlib.h> |
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13 |
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14 #include "dict.h" |
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15 #include "memory.h" |
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16 #include "rogue.h" |
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17 |
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18 #ifdef HAVE_CONFIG_H |
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19 #include "config.h" |
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20 #endif |
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21 |
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22 static char sccsid[] = "%W%\t%G%"; |
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23 |
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24 /* Debugging memory allocation code that tries to trap common memory problems |
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25 like overwriting storage and stepping on memory pointer chains. If code |
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26 doesn't use malloc, free, and realloc a lot, these routines can be left in |
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27 as added protection against undetected storage bugs. |
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28 */ |
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29 |
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30 /* FENCE_SIZE should be a multiple of sizeof(size_t) to prevent alignment problems. |
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31 The code assumes that malloc and realloc return pointers aligned at least on size_t |
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32 sized boundaries and that a pointer needs alignment no more strict than that of an |
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33 object needed to hold a size_t. |
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34 */ |
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35 |
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36 #define FENCE_SIZE (sizeof(size_t) * 1024) |
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37 |
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38 static int memdebug_level = 0; |
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39 static DICTIONARY *allocations = NULL; |
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40 static FILE *trace_file = NULL; |
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41 |
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42 /* set the debug level */ |
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43 void mem_debug(const int level) |
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44 { |
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45 memdebug_level = level; |
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46 |
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47 #ifdef MEM_DEBUG |
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48 if (trace_file == NULL) |
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49 trace_file = fopen("trace", "w"); |
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50 |
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51 /* all except 0, 1, and unknown fall through */ |
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52 switch(memdebug_level) { |
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53 case 2: |
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54 fprintf(trace_file, "+++ Memory tracking possible, "); |
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55 case 1: |
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56 fprintf(trace_file, "+++ Memory debugging enabled, "); |
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57 break; |
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58 case 0: |
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59 fprintf(trace_file, "+++ Memory debugging disabled, "); |
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60 break; |
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61 default: |
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62 fprintf(trace_file, "!!! Unknown memory debug level set, enabling level 1, "); |
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63 memdebug_level = 1; |
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64 break; |
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65 } |
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66 fprintf(trace_file, "fence size = %d\n", FENCE_SIZE); |
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67 #endif |
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68 } |
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69 |
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70 /* set memory tracking on or off */ |
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71 /* turning it off deletes all tracking data */ |
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72 void mem_tracking(int flag) |
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73 { |
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74 #ifdef MEM_DEBUG |
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75 /* do nothing if debuglevel is too low */ |
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76 if (memdebug_level < 2) |
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77 return; |
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78 |
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79 /* turn on tracking */ |
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80 if (flag > 0) { |
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81 if (allocations != NULL) { |
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82 dict_destroy(allocations); |
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83 allocations = NULL; |
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84 } |
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85 allocations = dict_create(8, 100, 4, 20); |
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86 if (allocations == NULL) { |
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87 fprintf(trace_file, "!!! Unable to allocate tracking table!\n"); |
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88 abort(); |
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89 } |
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90 } |
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91 /* turn off tracking */ |
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92 else if (allocations != NULL) { |
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93 dict_destroy(allocations); |
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94 allocations = NULL; |
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95 } |
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96 #endif |
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97 } |
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98 |
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99 /* go through all pointers and see if they are OK, aborting if not */ |
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100 /* always returns 1 if not aborting so that it can be included in */ |
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101 /* if statement boolean expressions */ |
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102 int mem_check(char *fname, int linenum) |
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103 { |
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104 #ifdef MEM_DEBUG |
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105 STRING_ENTRY *se; |
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106 |
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107 /* scan of a NULL dictionary always succeeds */ |
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108 if (allocations == NULL) |
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109 return TRUE; |
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110 |
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111 if (!dict_scan_begin(allocations)) { |
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112 fprintf(trace_file, "!!! Dictionary scan initialization failed!\n"); |
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113 abort(); |
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114 } |
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115 |
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116 fprintf(trace_file, "\n+++ --- Starting pointer scan\n"); |
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117 fprintf(trace_file, "+++ --- At %s, %d\n", fname, linenum); |
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118 |
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119 /* mem_validate aborts if there is a problem */ |
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120 while((se = dict_scan_next(allocations)) != NULL) |
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121 mem_validate(se->any_ptr); |
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122 |
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123 fprintf(trace_file, "+++ --- Done pointer scan\n\n"); |
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124 |
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125 #endif |
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126 /* always return a good value if execution arrives here */ |
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127 return 1; |
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128 } |
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129 |
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130 /* allocate some memory and initialize header and trailer */ |
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131 void *mem_malloc(const size_t bytes) |
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132 { |
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133 #ifdef MEM_DEBUG |
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134 char *mem_temp; |
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135 size_t real_size = bytes + (FENCE_SIZE << 1); |
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136 |
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137 /* allocate including guard bytes to detect some ways of overwriting of memory areas */ |
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138 mem_temp = (void *)malloc(real_size); |
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139 if (memdebug_level > 0) { |
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140 fprintf(trace_file, "+++ Requested size of %ld bytes\n", bytes); |
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141 fprintf(trace_file, "+++ Actual malloc of %ld bytes located at %p\n", real_size, mem_temp); |
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142 } |
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143 |
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144 /* if allocation succeeded, set management data */ |
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145 if (mem_temp != NULL) { |
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146 size_t i; |
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147 char *end; |
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148 |
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149 /* do beginning marker bytes */ |
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150 for (i = 0; i < FENCE_SIZE - sizeof(size_t); i++) |
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151 *mem_temp++ = 145; |
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152 |
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153 /* save size in header too */ |
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154 if (memdebug_level > 0) |
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155 fprintf(trace_file, "*** Requested memory size stored at %p\n", mem_temp); |
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156 *(size_t *)mem_temp = bytes; |
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157 |
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158 /* finally, point to storage we are going to hand out */ |
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159 mem_temp += sizeof(size_t); |
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160 |
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161 /* now, point to trailer bytes and do them */ |
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162 end = mem_temp + bytes; |
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163 for (i = 0; i < FENCE_SIZE; i++) |
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164 *end++ = 145; |
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165 |
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166 /* now zap contents to zero */ |
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167 for (i = 0; i < bytes; i++) |
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168 mem_temp[i] = 0; |
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169 } |
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170 |
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171 /* track pointer if needed */ |
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172 if (memdebug_level > 1 && allocations != NULL) { |
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173 char key[16]; |
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174 long temp; |
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175 |
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176 sprintf(key, "%p", mem_temp); |
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177 if (dict_insert(allocations, key, 1, (const unsigned long) bytes, mem_temp, &temp) == NULL) { |
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178 fprintf(trace_file, "!!! Insert of pointer tracking info failed\n"); |
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179 abort(); |
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180 } |
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181 } |
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182 |
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183 /* allow caller to do error handling */ |
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184 if (memdebug_level > 0) { |
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185 fprintf(trace_file, "--- Returning pointer of %p\n", mem_temp); |
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186 fflush(trace_file); |
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187 } |
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188 return (void *)mem_temp; |
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189 #else |
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190 return malloc(bytes); |
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191 #endif |
256
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192 } |
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193 |
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194 /* release some memory, making sure that it was properly allocated */ |
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195 void mem_free(const void *ptr) |
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196 { |
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197 #ifdef MEM_DEBUG |
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198 char *mem_temp; |
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199 size_t mem_size; |
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200 size_t i; |
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201 |
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202 if (memdebug_level > 0) |
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203 fprintf(trace_file, "+++ Free of memory located at %p\n", ptr); |
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204 if (ptr == NULL) { |
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205 if (memdebug_level > 0) { |
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206 fprintf(trace_file, "!!! Freeing NULL pointer\n"); |
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207 fflush(trace_file); |
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208 } |
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209 abort(); |
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210 } |
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211 |
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212 mem_validate(ptr); /* doesn't return on error */ |
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213 |
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214 /* get location of size of area */ |
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215 mem_temp = (char *)ptr - sizeof(size_t); |
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216 |
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217 /* get and calculate real size */ |
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218 mem_size = *(size_t *)mem_temp + (FENCE_SIZE << 1); |
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219 |
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220 /* if doing memory tracking */ |
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221 if (memdebug_level > 1 && allocations != NULL) { |
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222 char key[16]; |
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223 STRING_ENTRY *se; |
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224 long temp; |
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225 |
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226 sprintf(key, "%p", ptr); |
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227 |
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228 if ((se = dict_search(allocations, key, &temp)) == NULL) { |
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229 fprintf(trace_file, "!!! Deleting pointer not found in tracking info\n"); |
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230 abort(); |
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231 } |
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232 |
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233 if (se->count == 0) { |
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234 fprintf(trace_file, "!!! Freeing a pointer that has already been freed!\n"); |
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235 abort(); |
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236 } |
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237 else if (se->flags != mem_size - (FENCE_SIZE << 1)) { |
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238 fprintf(trace_file, "!!! Stored size different from tracking size!\n"); |
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239 abort(); |
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240 } |
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241 |
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242 /* remember deleted stuff by zeroing the allocation count */ |
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243 se->count = 0; |
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244 se->flags = 0; |
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245 } |
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246 |
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247 /* zap bytes being freed */ |
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248 for (i = 0, mem_temp = (char *)ptr - FENCE_SIZE; i < mem_size; i++, mem_temp++) |
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249 *mem_temp = 243; |
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250 |
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251 if (memdebug_level > 0) |
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252 fflush(trace_file); |
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253 |
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254 mem_temp = (char *)ptr - FENCE_SIZE; |
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255 free((void *)mem_temp); |
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256 #else |
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257 free((void *) ptr); |
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258 #endif |
256
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259 } |
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260 |
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261 /* reallocate some memory, making sure that it was properly allocated */ |
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262 void *mem_realloc(const void *ptr, const size_t new_size) |
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263 { |
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264 #ifdef MEM_DEBUG |
256
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265 char *mem_temp = (char *)ptr; |
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266 size_t real_size = new_size + (FENCE_SIZE << 1); |
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267 size_t mem_size; |
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268 long i; |
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269 |
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270 if (memdebug_level > 0) { |
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271 fprintf(trace_file, "+++ Requested size of %ld bytes\n", new_size); |
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272 fprintf(trace_file, "+++ Actual realloc of %ld bytes located at %p\n", real_size, mem_temp); |
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273 } |
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274 if (ptr == NULL) { |
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275 if (memdebug_level > 0) { |
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276 fprintf(trace_file, "!!! Reallocating NULL pointer\n"); |
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277 fflush(trace_file); |
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278 } |
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279 abort(); |
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280 } |
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281 |
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282 mem_validate(ptr); /* doesn't return on error */ |
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283 |
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284 /* if doing memory tracking */ |
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285 if (memdebug_level > 1 && allocations != NULL) { |
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286 char key[16]; |
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287 STRING_ENTRY *se; |
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288 long temp; |
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289 |
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290 sprintf(key, "%p", ptr); |
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291 |
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292 if ((se = dict_search(allocations, key, &temp)) == NULL) { |
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293 fprintf(trace_file, "!!! Deleting a pointer not found in tracking info!\n"); |
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294 abort(); |
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295 } |
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296 |
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297 /* point to size bytes */ |
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298 mem_temp = (char *)ptr - sizeof(size_t); |
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299 |
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300 /* get user size */ |
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301 mem_size = *(size_t *)mem_temp; |
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302 |
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303 if (se->count == 0) { |
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304 fprintf(trace_file, "!!! Freeing a pointer that has already been freed!\n"); |
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305 abort(); |
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306 } |
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307 else if (se->flags != mem_size) { |
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308 fprintf(trace_file, "!!! Stored size different from tracking size!\n"); |
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309 abort(); |
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310 } |
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311 |
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312 /* remember deleted stuff by zeroing the allocation count */ |
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313 se->count = 0; |
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314 se->flags = 0; |
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315 } |
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316 |
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317 |
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318 /* header marker bytes will be copied by the realloc */ |
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319 mem_temp = (char *)ptr - FENCE_SIZE; |
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320 mem_temp = realloc((void *)mem_temp, real_size); |
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321 |
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322 if (mem_temp != NULL) { |
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323 char *end; |
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324 |
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325 /* save size in header too */ |
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326 mem_temp += FENCE_SIZE - sizeof(size_t); |
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327 if (memdebug_level > 0) |
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328 fprintf(trace_file, "*** Requested memory size stored at %p\n", mem_temp); |
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329 *(size_t *)mem_temp = new_size; |
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330 |
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331 /* finally, point to storage we are going to hand out */ |
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332 mem_temp += sizeof(size_t); |
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333 |
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334 /* now, point to trailer bytes and do them */ |
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335 end = mem_temp + new_size; |
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336 for (i = 0; i < FENCE_SIZE; i++) |
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337 *end++ = 145; |
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338 } |
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339 |
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340 if (memdebug_level > 1 && allocations != NULL) { |
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341 char key[16]; |
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342 long temp; |
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343 |
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344 sprintf(key, "%p", mem_temp); |
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345 if (dict_insert(allocations, key, 1, (const unsigned long)new_size, mem_temp, &temp) == NULL) { |
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346 fprintf(trace_file, "!!! Insert of pointer tracking info failed\n"); |
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347 abort(); |
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348 } |
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349 } |
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350 |
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351 if (memdebug_level > 0) { |
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352 fprintf(trace_file, "--- Returning pointer of %p\n", mem_temp); |
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353 fflush(trace_file); |
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354 } |
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355 return (void *)mem_temp; |
288
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356 #else |
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357 return realloc((void *) ptr, new_size); |
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358 #endif |
256
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359 } |
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360 |
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361 /* check a pointer to be sure all check bytes are OK. abort if not */ |
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362 /* always returns 1 if not aborting so that it can be included in */ |
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363 /* if statement boolean expressions */ |
257
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364 int mem_validate(const void *ptr) |
256
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365 { |
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366 #ifdef MEM_DEBUG |
256
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367 unsigned char *mem_temp = (unsigned char *)ptr; |
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368 size_t mem_size; |
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369 size_t i; |
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370 |
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371 /* NULL pointers are always valid */ |
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372 if (ptr == NULL) |
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373 return 1; |
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374 |
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375 if (memdebug_level > 0) |
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376 fprintf(trace_file, "+++ Checking %p as pointer\n", ptr); |
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377 |
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378 |
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379 if (memdebug_level > 1 && allocations != NULL) { |
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380 char key[16]; |
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381 STRING_ENTRY *se; |
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382 long temp; |
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383 |
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384 sprintf(key, "%p", ptr); |
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385 |
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386 if ((se = dict_search(allocations, key, &temp)) == NULL) { |
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387 fprintf(trace_file, "!!! Pointer not found in tracking info!\n"); |
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388 abort(); |
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389 } |
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390 |
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391 /* point to size bytes */ |
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392 mem_temp = (unsigned char *)ptr - sizeof(size_t); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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393 |
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394 /* get user size */ |
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395 mem_size = *(size_t *)mem_temp; |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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396 |
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397 if (se->count == 0) { |
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398 fprintf(trace_file, "!!! Checking pointer has been freed!\n"); |
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399 abort(); |
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400 } |
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401 else if (se->flags != mem_size) { |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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402 fprintf(trace_file, "!!! Stored size different from tracking size!\n"); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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403 abort(); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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404 } |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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405 } |
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406 |
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407 /* check the header bytes */ |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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408 mem_temp = (unsigned char *) ptr - FENCE_SIZE; |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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409 if (memdebug_level > 0) |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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410 fprintf(trace_file, "+++ Real pointer at %p\n", mem_temp); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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411 |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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412 |
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413 for (i = 0; i < FENCE_SIZE - sizeof(size_t); i++) |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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414 if (*mem_temp++ != 145) { |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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415 if (memdebug_level > 0) { |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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416 fprintf(trace_file, "!!! The user pointer at %p has been overwritten\n", ptr); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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417 fprintf(trace_file, "!!! Header offset %ld has been changed\n", i - 1); |
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418 fflush(trace_file); |
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419 } |
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420 abort(); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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421 } |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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422 |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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423 /* check size */ |
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424 i = *(size_t *)mem_temp; |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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425 if (memdebug_level > 0) |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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426 fprintf(trace_file, "*** Stored memory size of %ld bytes in header\n", i); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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427 |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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428 |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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429 /* now point to where trailer should be */ |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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430 mem_temp = (unsigned char *)ptr + i; |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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431 for (i = 0; i < FENCE_SIZE; i++) |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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432 if (*mem_temp++ != 145) { |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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433 if (memdebug_level > 0) { |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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434 fprintf(trace_file, "!!! The user pointer at %p has been overwritten\n", ptr); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
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435 fprintf(trace_file, "!!! Trailer offset %ld has been changed\n", i - 1); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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436 fflush(trace_file); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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|
437 } |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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438 abort(); |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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439 } |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
John "Elwin" Edwards
parents:
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|
440 if (memdebug_level > 0) |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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parents:
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|
441 fflush(trace_file); |
288
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UltraRogue: compile out the built-in memory checking.
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257
diff
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442 #endif |
256
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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443 return 1; |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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444 } |