Guido van Rossum | f70e43a | 1991-02-19 12:39:46 +0000 | [diff] [blame] | 1 | /*********************************************************** |
| 2 | Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The |
| 3 | Netherlands. |
| 4 | |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
| 9 | provided that the above copyright notice appear in all copies and that |
| 10 | both that copyright notice and this permission notice appear in |
| 11 | supporting documentation, and that the names of Stichting Mathematisch |
| 12 | Centrum or CWI not be used in advertising or publicity pertaining to |
| 13 | distribution of the software without specific, written prior permission. |
| 14 | |
| 15 | STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO |
| 16 | THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| 17 | FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE |
| 18 | FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 19 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 20 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 21 | OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 22 | |
| 23 | ******************************************************************/ |
| 24 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 25 | /* Generic object operations; and implementation of None (NoObject) */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 26 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 27 | #include "allobjects.h" |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 28 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 29 | #ifdef REF_DEBUG |
| 30 | long ref_total; |
| 31 | #endif |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 32 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 33 | /* Object allocation routines used by NEWOBJ and NEWVAROBJ macros. |
| 34 | These are used by the individual routines for object creation. |
| 35 | Do not call them otherwise, they do not initialize the object! */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 36 | |
| 37 | object * |
| 38 | newobject(tp) |
| 39 | typeobject *tp; |
| 40 | { |
| 41 | object *op = (object *) malloc(tp->tp_basicsize); |
| 42 | if (op == NULL) |
| 43 | return err_nomem(); |
| 44 | NEWREF(op); |
| 45 | op->ob_type = tp; |
| 46 | return op; |
| 47 | } |
| 48 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 49 | varobject * |
| 50 | newvarobject(tp, size) |
| 51 | typeobject *tp; |
| 52 | unsigned int size; |
| 53 | { |
| 54 | varobject *op = (varobject *) |
| 55 | malloc(tp->tp_basicsize + size * tp->tp_itemsize); |
| 56 | if (op == NULL) |
Guido van Rossum | 05ab111 | 1991-05-05 20:10:41 +0000 | [diff] [blame] | 57 | return (varobject *)err_nomem(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 58 | NEWREF(op); |
| 59 | op->ob_type = tp; |
| 60 | op->ob_size = size; |
| 61 | return op; |
| 62 | } |
| 63 | |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 64 | int |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 65 | printobject(op, fp, flags) |
| 66 | object *op; |
| 67 | FILE *fp; |
| 68 | int flags; |
| 69 | { |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 70 | if (intrcheck()) { |
| 71 | err_set(KeyboardInterrupt); |
| 72 | return -1; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 73 | } |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 74 | if (op == NULL) { |
| 75 | fprintf(fp, "<nil>"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 76 | } |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 77 | else { |
| 78 | if (op->ob_refcnt <= 0) |
| 79 | fprintf(fp, "(refcnt %d):", op->ob_refcnt); |
| 80 | if (op->ob_type->tp_print == NULL) |
| 81 | fprintf(fp, "<%s object at %lx>", |
| 82 | op->ob_type->tp_name, (long)op); |
| 83 | else |
| 84 | return (*op->ob_type->tp_print)(op, fp, flags); |
| 85 | } |
| 86 | return 0; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | object * |
| 90 | reprobject(v) |
| 91 | object *v; |
| 92 | { |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 93 | if (intrcheck()) { |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 94 | err_set(KeyboardInterrupt); |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 95 | return NULL; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 96 | } |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 97 | if (v == NULL) |
| 98 | return newstringobject("<NULL>"); |
| 99 | else if (v->ob_type->tp_repr == NULL) { |
| 100 | char buf[120]; |
| 101 | sprintf(buf, "<%.80s object at %lx>", |
| 102 | v->ob_type->tp_name, (long)v); |
| 103 | return newstringobject(buf); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 104 | } |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 105 | else |
| 106 | return (*v->ob_type->tp_repr)(v); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | int |
| 110 | cmpobject(v, w) |
| 111 | object *v, *w; |
| 112 | { |
| 113 | typeobject *tp; |
| 114 | if (v == w) |
| 115 | return 0; |
| 116 | if (v == NULL) |
| 117 | return -1; |
| 118 | if (w == NULL) |
| 119 | return 1; |
Guido van Rossum | 9fb0368 | 1991-07-01 18:48:04 +0000 | [diff] [blame] | 120 | if ((tp = v->ob_type) != w->ob_type) { |
| 121 | if (tp->tp_as_number != NULL && |
| 122 | w->ob_type->tp_as_number != NULL) { |
| 123 | if (coerce(&v, &w) != 0) { |
| 124 | err_clear(); |
| 125 | /* XXX Should report the error, |
| 126 | XXX but the interface isn't there... */ |
| 127 | } |
| 128 | else { |
| 129 | int cmp = (*v->ob_type->tp_compare)(v, w); |
| 130 | DECREF(v); |
| 131 | DECREF(w); |
| 132 | return cmp; |
| 133 | } |
| 134 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 135 | return strcmp(tp->tp_name, w->ob_type->tp_name); |
Guido van Rossum | 9fb0368 | 1991-07-01 18:48:04 +0000 | [diff] [blame] | 136 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 137 | if (tp->tp_compare == NULL) |
| 138 | return (v < w) ? -1 : 1; |
Guido van Rossum | 9fb0368 | 1991-07-01 18:48:04 +0000 | [diff] [blame] | 139 | return (*tp->tp_compare)(v, w); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 140 | } |
| 141 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 142 | object * |
| 143 | getattr(v, name) |
| 144 | object *v; |
| 145 | char *name; |
| 146 | { |
| 147 | if (v->ob_type->tp_getattr == NULL) { |
| 148 | err_setstr(TypeError, "attribute-less object"); |
| 149 | return NULL; |
| 150 | } |
| 151 | else { |
| 152 | return (*v->ob_type->tp_getattr)(v, name); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | int |
| 157 | setattr(v, name, w) |
| 158 | object *v; |
| 159 | char *name; |
| 160 | object *w; |
| 161 | { |
| 162 | if (v->ob_type->tp_setattr == NULL) { |
| 163 | if (v->ob_type->tp_getattr == NULL) |
| 164 | err_setstr(TypeError, "attribute-less object"); |
| 165 | else |
| 166 | err_setstr(TypeError, "object has read-only attributes"); |
Guido van Rossum | 73531a3 | 1990-12-20 23:12:40 +0000 | [diff] [blame] | 167 | return -1; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 168 | } |
| 169 | else { |
| 170 | return (*v->ob_type->tp_setattr)(v, name, w); |
| 171 | } |
| 172 | } |
| 173 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 174 | |
| 175 | /* |
| 176 | NoObject is usable as a non-NULL undefined value, used by the macro None. |
| 177 | There is (and should be!) no way to create other objects of this type, |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 178 | so there is exactly one (which is indestructible, by the way). |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 179 | */ |
| 180 | |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 181 | static int |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 182 | none_print(op, fp, flags) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 183 | object *op; |
| 184 | FILE *fp; |
| 185 | int flags; |
| 186 | { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 187 | fprintf(fp, "None"); |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 188 | return 0; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | static object * |
| 192 | none_repr(op) |
| 193 | object *op; |
| 194 | { |
| 195 | return newstringobject("None"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 196 | } |
| 197 | |
| 198 | static typeobject Notype = { |
| 199 | OB_HEAD_INIT(&Typetype) |
| 200 | 0, |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 201 | "None", |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 202 | 0, |
| 203 | 0, |
| 204 | 0, /*tp_dealloc*/ /*never called*/ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 205 | none_print, /*tp_print*/ |
| 206 | 0, /*tp_getattr*/ |
| 207 | 0, /*tp_setattr*/ |
| 208 | 0, /*tp_compare*/ |
| 209 | none_repr, /*tp_repr*/ |
| 210 | 0, /*tp_as_number*/ |
| 211 | 0, /*tp_as_sequence*/ |
| 212 | 0, /*tp_as_mapping*/ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 213 | }; |
| 214 | |
| 215 | object NoObject = { |
| 216 | OB_HEAD_INIT(&Notype) |
| 217 | }; |
| 218 | |
| 219 | |
| 220 | #ifdef TRACE_REFS |
| 221 | |
| 222 | static object refchain = {&refchain, &refchain}; |
| 223 | |
| 224 | NEWREF(op) |
| 225 | object *op; |
| 226 | { |
| 227 | ref_total++; |
| 228 | op->ob_refcnt = 1; |
| 229 | op->_ob_next = refchain._ob_next; |
| 230 | op->_ob_prev = &refchain; |
| 231 | refchain._ob_next->_ob_prev = op; |
| 232 | refchain._ob_next = op; |
| 233 | } |
| 234 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 235 | UNREF(op) |
| 236 | register object *op; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 237 | { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 238 | register object *p; |
Guido van Rossum | bd3edc8 | 1990-11-02 17:49:51 +0000 | [diff] [blame] | 239 | if (op->ob_refcnt < 0) { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 240 | fprintf(stderr, "UNREF negative refcnt\n"); |
| 241 | abort(); |
| 242 | } |
| 243 | for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) { |
| 244 | if (p == op) |
| 245 | break; |
| 246 | } |
| 247 | if (p == &refchain) { /* Not found */ |
| 248 | fprintf(stderr, "UNREF unknown object\n"); |
Guido van Rossum | bd3edc8 | 1990-11-02 17:49:51 +0000 | [diff] [blame] | 249 | abort(); |
| 250 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 251 | op->_ob_next->_ob_prev = op->_ob_prev; |
| 252 | op->_ob_prev->_ob_next = op->_ob_next; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | DELREF(op) |
| 256 | object *op; |
| 257 | { |
| 258 | UNREF(op); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 259 | (*(op)->ob_type->tp_dealloc)(op); |
| 260 | } |
| 261 | |
| 262 | printrefs(fp) |
| 263 | FILE *fp; |
| 264 | { |
| 265 | object *op; |
| 266 | fprintf(fp, "Remaining objects:\n"); |
| 267 | for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) { |
| 268 | fprintf(fp, "[%d] ", op->ob_refcnt); |
Guido van Rossum | 9093361 | 1991-06-07 16:10:43 +0000 | [diff] [blame] | 269 | if (printobject(op, fp, 0) != 0) |
| 270 | err_clear(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 271 | putc('\n', fp); |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | #endif |