| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: track.h,v 1.1 1998/06/17 23:44:42 mdw Exp $ |
| 4 | * |
| 5 | * Tracing functions for debugging |
| 6 | * |
| 7 | * (c) 1998 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of the mLib utilities library. |
| 13 | * |
| 14 | * mLib is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * mLib is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with mLib; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Revision history --------------------------------------------------* |
| 30 | * |
| 31 | * $Log: track.h,v $ |
| 32 | * Revision 1.1 1998/06/17 23:44:42 mdw |
| 33 | * Initial revision |
| 34 | * |
| 35 | */ |
| 36 | |
| 37 | #ifndef TRACK_H |
| 38 | #define TRACK_H |
| 39 | |
| 40 | #ifdef __cplusplus |
| 41 | extern "C" { |
| 42 | #endif |
| 43 | |
| 44 | #include <stdlib.h> |
| 45 | |
| 46 | /*----- Options and conventions -------------------------------------------* |
| 47 | * |
| 48 | * The following macros affect the tracking system: |
| 49 | * |
| 50 | * @TRACK_ENABLE@: Enable tracking of memory allocations |
| 51 | * @TRACK_BLAME@: Register my context blocks in allocations |
| 52 | * |
| 53 | * The reason there are two switches is simple. It's often the case that a |
| 54 | * library routine allocates memory for its client. Therefore, whether we |
| 55 | * want to record the library or the client depends on how much we trust |
| 56 | * the two pieces of software. Setting @TRACK_ENABLE@ and @TRACK_BLAME@ |
| 57 | * suggests that the current source file might leak memory, so we want its |
| 58 | * context markers in the list. Setting @TRACK_ENABLE@ but not |
| 59 | * @TRACK_BLAME@ suggests that we trust this code, but not the code which |
| 60 | * calls it, so we want to preserve the caller's context markers. |
| 61 | * |
| 62 | * Got it? Good. |
| 63 | */ |
| 64 | |
| 65 | /*----- Type definitions --------------------------------------------------*/ |
| 66 | |
| 67 | /* --- A context buffer --- */ |
| 68 | |
| 69 | typedef struct track_ctx { |
| 70 | struct track_ctx *next; |
| 71 | const char *s; |
| 72 | } track_ctx; |
| 73 | |
| 74 | /*----- Functions provided ------------------------------------------------*/ |
| 75 | |
| 76 | /* --- @track_setLevel@ --- * |
| 77 | * |
| 78 | * Arguments: @unsigned int l@ = tracing level for allocation messages |
| 79 | * |
| 80 | * Returns: --- |
| 81 | * |
| 82 | * Use: Sets the trace level for allocation messages. |
| 83 | */ |
| 84 | |
| 85 | extern void track_setLevel(unsigned int /*l*/); |
| 86 | |
| 87 | /* --- @track_pushContext@ --- * |
| 88 | * |
| 89 | * Arguments: @track_ctx *ctx@ = context holder to push |
| 90 | * |
| 91 | * Returns: --- |
| 92 | * |
| 93 | * Use: Pushes the given context block onto the stack. |
| 94 | */ |
| 95 | |
| 96 | extern void track_pushContext(track_ctx */*ctx*/); |
| 97 | |
| 98 | /* --- @track_popContext@ --- * |
| 99 | * |
| 100 | * Arguments: @track_ctx *ctx@ = context holder to pop |
| 101 | * |
| 102 | * Returns: --- |
| 103 | * |
| 104 | * Use: Removes the given context block from the stack. |
| 105 | */ |
| 106 | |
| 107 | extern void track_popContext(track_ctx */*ctx*/); |
| 108 | |
| 109 | /* --- @track_malloc@ --- * |
| 110 | * |
| 111 | * Arguments: @size_t sz@ = size requested |
| 112 | * |
| 113 | * Returns: Pointer to allocated space, or null |
| 114 | * |
| 115 | * Use: Allocates memory, and tracks how much is allocated. |
| 116 | */ |
| 117 | |
| 118 | extern void *track_malloc(size_t /*sz*/); |
| 119 | |
| 120 | /* --- @track_free@ --- * |
| 121 | * |
| 122 | * Arguments: @void *p@ = pointer to an allocated block |
| 123 | * |
| 124 | * Returns: --- |
| 125 | * |
| 126 | * Use: Frees memory, and tracks how much is still allocated. |
| 127 | */ |
| 128 | |
| 129 | extern void track_free(void */*p*/); |
| 130 | |
| 131 | /* --- @track_realloc@ --- * |
| 132 | * |
| 133 | * Arguments: @void *p@ = pointer to an allocated block |
| 134 | * @size_t sz@ = how big it wants to be |
| 135 | * |
| 136 | * Returns: Pointer to the new block. |
| 137 | * |
| 138 | * Use: Reallocates a block, tracking how much memory is still |
| 139 | * available. |
| 140 | */ |
| 141 | |
| 142 | extern void *track_realloc(void */*p*/, size_t /*sz*/); |
| 143 | |
| 144 | /* --- @track_used@ --- * |
| 145 | * |
| 146 | * Arguments: --- |
| 147 | * |
| 148 | * Returns: A count of how much memory is used currently. |
| 149 | * |
| 150 | * Use: Returns the amount of memory which the @track_@-functions |
| 151 | * above have counted as being currently allocated. |
| 152 | */ |
| 153 | |
| 154 | extern unsigned long track_used(void); |
| 155 | |
| 156 | /* --- @track_list@ --- * |
| 157 | * |
| 158 | * Arguments: @unsigned int l@ = trace level to use |
| 159 | * |
| 160 | * Returns: --- |
| 161 | * |
| 162 | * Use: Traces a dump of the currently known blocks. Combined with |
| 163 | * a verbose dump of allocations and deallocations, and a |
| 164 | * good idea of which blocks were allocated where, this can |
| 165 | * be useful for locating memory leaks. It's not exactly a |
| 166 | * picnic, though. |
| 167 | */ |
| 168 | |
| 169 | extern void track_list(unsigned int l); |
| 170 | |
| 171 | /*----- Macro wrappers ----------------------------------------------------*/ |
| 172 | |
| 173 | |
| 174 | /* --- If tracking is to be done, set it up --- */ |
| 175 | |
| 176 | #ifdef TRACK_ENABLE |
| 177 | # undef malloc |
| 178 | # define malloc(sz) track_malloc(sz) |
| 179 | # undef free |
| 180 | # define free(p) track_free(p) |
| 181 | # undef realloc |
| 182 | # define realloc(p, sz) track_realloc(p, sz) |
| 183 | #endif |
| 184 | |
| 185 | /* --- Provide a context for doing track-related things --- */ |
| 186 | |
| 187 | #ifdef TRACK_ENABLE |
| 188 | # define TRACK(x) x |
| 189 | #else |
| 190 | # define TRACK(x) |
| 191 | #endif |
| 192 | |
| 193 | /* --- Handle contexts --- */ |
| 194 | |
| 195 | #if defined(TRACK_ENABLE) && defined(TRACK_BLAME) |
| 196 | # define TRACK_NCTX(name, string) track__context name = { 0, string } |
| 197 | # define TRACK_NPUSH(name) track_pushContext(name) |
| 198 | # define TRACK_NPOP(name) track_popContext(name) |
| 199 | # define TRACK_CTX(string) TRACK_NCTX(track__localContext, string) |
| 200 | # define TRACK_PUSH TRACK_NPUSH(track__localContext) |
| 201 | # define TRACK_POP TRACK_NPOP(track__localContext) |
| 202 | #else |
| 203 | # define TRACK_NCTX(name, string) |
| 204 | # define TRACK_NPUSH(name) ((void)0) |
| 205 | # define TRACK_NPOP(name) ((void)0) |
| 206 | # define TRACK_CTX(string) |
| 207 | # define TRACK_PUSH ((void)0) |
| 208 | # define TRACK_POP ((void)0) |
| 209 | #endif |
| 210 | |
| 211 | /*----- That's all, folks -------------------------------------------------*/ |
| 212 | |
| 213 | #ifdef __cplusplus |
| 214 | } |
| 215 | #endif |
| 216 | |
| 217 | #endif |