Mercurial > cpython-lru_cache-weakref
annotate Objects/object.c @ 1330:409ea74feb21 legacy-trunk
Minor fixes / changes for Mac compatibility.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Thu, 29 Jul 1993 08:25:09 +0000 |
| parents | 716be765a79b |
| children | a22a350d3a5d |
| rev | line source |
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| 145 | 1 /*********************************************************** |
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2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum, |
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3 Amsterdam, The Netherlands. |
| 145 | 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 | |
| 86 | 25 /* Generic object operations; and implementation of None (NoObject) */ |
| 6 | 26 |
| 86 | 27 #include "allobjects.h" |
| 6 | 28 |
| 86 | 29 #ifdef REF_DEBUG |
| 30 long ref_total; | |
| 31 #endif | |
| 6 | 32 |
| 86 | 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! */ | |
| 6 | 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 | |
| 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) | |
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57 return (varobject *)err_nomem(); |
| 6 | 58 NEWREF(op); |
| 59 op->ob_type = tp; | |
| 60 op->ob_size = size; | |
| 61 return op; | |
| 62 } | |
| 63 | |
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64 int |
| 6 | 65 printobject(op, fp, flags) |
| 66 object *op; | |
| 67 FILE *fp; | |
| 68 int flags; | |
| 69 { | |
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70 int ret = 0; |
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71 if (intrcheck()) { |
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72 err_set(KeyboardInterrupt); |
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73 return -1; |
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74 } |
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75 if (op == NULL) { |
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76 fprintf(fp, "<nil>"); |
| 6 | 77 } |
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78 else { |
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79 if (op->ob_refcnt <= 0) |
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80 fprintf(fp, "<refcnt %u at %lx>", |
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81 op->ob_refcnt, (long)op); |
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82 else if (op->ob_type->tp_print == NULL) { |
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83 if (op->ob_type->tp_repr == NULL) { |
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84 fprintf(fp, "<%s object at %lx>", |
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85 op->ob_type->tp_name, (long)op); |
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86 } |
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87 else { |
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88 object *s = reprobject(op); |
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89 if (s == NULL) |
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90 ret = -1; |
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91 else if (!is_stringobject(s)) { |
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92 err_setstr(TypeError, |
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93 "repr not string"); |
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94 ret = -1; |
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95 } |
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96 else { |
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97 fprintf(fp, "%s", getstringvalue(s)); |
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98 } |
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99 XDECREF(s); |
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100 } |
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101 } |
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102 else |
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103 ret = (*op->ob_type->tp_print)(op, fp, flags); |
| 6 | 104 } |
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105 if (ret == 0) { |
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106 if (ferror(fp)) { |
| 473 | 107 err_errno(IOError); |
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108 clearerr(fp); |
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109 ret = -1; |
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110 } |
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111 } |
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112 return ret; |
| 6 | 113 } |
| 114 | |
| 115 object * | |
| 116 reprobject(v) | |
| 117 object *v; | |
| 118 { | |
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119 if (intrcheck()) { |
| 6 | 120 err_set(KeyboardInterrupt); |
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121 return NULL; |
| 6 | 122 } |
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123 if (v == NULL) |
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124 return newstringobject("<NULL>"); |
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125 else if (v->ob_type->tp_repr == NULL) { |
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126 char buf[120]; |
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127 sprintf(buf, "<%.80s object at %lx>", |
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128 v->ob_type->tp_name, (long)v); |
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129 return newstringobject(buf); |
| 6 | 130 } |
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131 else |
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132 return (*v->ob_type->tp_repr)(v); |
| 6 | 133 } |
| 134 | |
| 135 int | |
| 136 cmpobject(v, w) | |
| 137 object *v, *w; | |
| 138 { | |
| 139 typeobject *tp; | |
| 140 if (v == w) | |
| 141 return 0; | |
| 142 if (v == NULL) | |
| 143 return -1; | |
| 144 if (w == NULL) | |
| 145 return 1; | |
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146 if ((tp = v->ob_type) != w->ob_type) { |
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147 if (tp->tp_as_number != NULL && |
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148 w->ob_type->tp_as_number != NULL) { |
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149 if (coerce(&v, &w) != 0) { |
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150 err_clear(); |
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151 /* XXX Should report the error, |
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152 XXX but the interface isn't there... */ |
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153 } |
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154 else { |
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155 int cmp = (*v->ob_type->tp_compare)(v, w); |
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156 DECREF(v); |
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157 DECREF(w); |
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158 return cmp; |
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159 } |
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160 } |
| 6 | 161 return strcmp(tp->tp_name, w->ob_type->tp_name); |
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162 } |
| 6 | 163 if (tp->tp_compare == NULL) |
| 164 return (v < w) ? -1 : 1; | |
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165 return (*tp->tp_compare)(v, w); |
| 6 | 166 } |
| 167 | |
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168 long |
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169 hashobject(v) |
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170 object *v; |
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171 { |
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172 typeobject *tp = v->ob_type; |
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173 if (tp->tp_hash != NULL) |
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174 return (*tp->tp_hash)(v); |
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175 if (tp->tp_compare == NULL) |
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176 return (long) v; /* Use address as hash value */ |
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177 /* If there's a cmp but no hash defined, the object can't be hashed */ |
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178 err_setstr(TypeError, "unhashable type"); |
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179 return -1; |
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180 } |
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181 |
| 86 | 182 object * |
| 183 getattr(v, name) | |
| 184 object *v; | |
| 185 char *name; | |
| 186 { | |
| 187 if (v->ob_type->tp_getattr == NULL) { | |
| 188 err_setstr(TypeError, "attribute-less object"); | |
| 189 return NULL; | |
| 190 } | |
| 191 else { | |
| 192 return (*v->ob_type->tp_getattr)(v, name); | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 int | |
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197 hasattr(v, name) |
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198 object *v; |
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199 char *name; |
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200 { |
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201 object *res = getattr(v, name); |
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202 if (res != NULL) { |
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203 DECREF(res); |
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204 return 1; |
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205 } |
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206 err_clear(); |
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207 return 0; |
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208 } |
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209 |
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210 int |
| 86 | 211 setattr(v, name, w) |
| 212 object *v; | |
| 213 char *name; | |
| 214 object *w; | |
| 215 { | |
| 216 if (v->ob_type->tp_setattr == NULL) { | |
| 217 if (v->ob_type->tp_getattr == NULL) | |
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218 err_setstr(TypeError, |
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219 "attribute-less object (assign or del)"); |
| 86 | 220 else |
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221 err_setstr(TypeError, |
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222 "object has read-only attributes"); |
| 95 | 223 return -1; |
| 86 | 224 } |
| 225 else { | |
| 226 return (*v->ob_type->tp_setattr)(v, name, w); | |
| 227 } | |
| 228 } | |
| 229 | |
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230 /* Test a value used as condition, e.g., in a for or if statement. |
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231 Return -1 if an error occurred */ |
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232 |
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233 int |
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234 testbool(v) |
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235 object *v; |
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236 { |
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237 int res; |
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238 if (v == None) |
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239 res = 0; |
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240 else if (v->ob_type->tp_as_number != NULL) |
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241 res = (*v->ob_type->tp_as_number->nb_nonzero)(v); |
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242 else if (v->ob_type->tp_as_mapping != NULL) |
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243 res = (*v->ob_type->tp_as_mapping->mp_length)(v); |
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244 else if (v->ob_type->tp_as_sequence != NULL) |
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245 res = (*v->ob_type->tp_as_sequence->sq_length)(v); |
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246 else |
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247 res = 1; |
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248 if (res > 0) |
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249 res = 1; |
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250 return res; |
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251 } |
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252 |
| 6 | 253 |
| 254 /* | |
| 255 NoObject is usable as a non-NULL undefined value, used by the macro None. | |
| 256 There is (and should be!) no way to create other objects of this type, | |
| 86 | 257 so there is exactly one (which is indestructible, by the way). |
| 6 | 258 */ |
| 259 | |
| 739 | 260 /* ARGSUSED */ |
| 86 | 261 static object * |
| 262 none_repr(op) | |
| 263 object *op; | |
| 264 { | |
| 265 return newstringobject("None"); | |
| 6 | 266 } |
| 267 | |
| 268 static typeobject Notype = { | |
| 269 OB_HEAD_INIT(&Typetype) | |
| 270 0, | |
| 86 | 271 "None", |
| 6 | 272 0, |
| 273 0, | |
| 274 0, /*tp_dealloc*/ /*never called*/ | |
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275 0, /*tp_print*/ |
| 86 | 276 0, /*tp_getattr*/ |
| 277 0, /*tp_setattr*/ | |
| 278 0, /*tp_compare*/ | |
| 279 none_repr, /*tp_repr*/ | |
| 280 0, /*tp_as_number*/ | |
| 281 0, /*tp_as_sequence*/ | |
| 282 0, /*tp_as_mapping*/ | |
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283 0, /*tp_hash */ |
| 6 | 284 }; |
| 285 | |
| 286 object NoObject = { | |
| 287 OB_HEAD_INIT(&Notype) | |
| 288 }; | |
| 289 | |
| 290 | |
| 291 #ifdef TRACE_REFS | |
| 292 | |
| 293 static object refchain = {&refchain, &refchain}; | |
| 294 | |
| 295 NEWREF(op) | |
| 296 object *op; | |
| 297 { | |
| 298 ref_total++; | |
| 299 op->ob_refcnt = 1; | |
| 300 op->_ob_next = refchain._ob_next; | |
| 301 op->_ob_prev = &refchain; | |
| 302 refchain._ob_next->_ob_prev = op; | |
| 303 refchain._ob_next = op; | |
| 304 } | |
| 305 | |
| 86 | 306 UNREF(op) |
| 307 register object *op; | |
| 6 | 308 { |
| 86 | 309 register object *p; |
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310 if (op->ob_refcnt < 0) { |
| 86 | 311 fprintf(stderr, "UNREF negative refcnt\n"); |
| 312 abort(); | |
| 313 } | |
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314 if (op == &refchain || |
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315 op->_ob_prev->_ob_next != op || op->_ob_next->_ob_prev != op) { |
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316 fprintf(stderr, "UNREF invalid object\n"); |
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317 abort(); |
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318 } |
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319 #ifdef SLOW_UNREF_CHECK |
| 86 | 320 for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) { |
| 321 if (p == op) | |
| 322 break; | |
| 323 } | |
| 324 if (p == &refchain) { /* Not found */ | |
| 325 fprintf(stderr, "UNREF unknown object\n"); | |
|
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326 abort(); |
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327 } |
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328 #endif |
| 6 | 329 op->_ob_next->_ob_prev = op->_ob_prev; |
| 330 op->_ob_prev->_ob_next = op->_ob_next; | |
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331 op->_ob_next = op->_ob_prev = NULL; |
| 86 | 332 } |
| 333 | |
| 334 DELREF(op) | |
| 335 object *op; | |
| 336 { | |
| 337 UNREF(op); | |
| 6 | 338 (*(op)->ob_type->tp_dealloc)(op); |
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339 op->ob_type = NULL; |
| 6 | 340 } |
| 341 | |
| 342 printrefs(fp) | |
| 343 FILE *fp; | |
| 344 { | |
| 345 object *op; | |
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346 fprintf(fp, "Remaining objects (except strings referenced once):\n"); |
| 6 | 347 for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) { |
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348 if (op->ob_refcnt == 1 && is_stringobject(op)) |
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349 continue; /* Will be printed elsewhere */ |
| 6 | 350 fprintf(fp, "[%d] ", op->ob_refcnt); |
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351 if (printobject(op, fp, 0) != 0) |
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352 err_clear(); |
| 6 | 353 putc('\n', fp); |
| 354 } | |
| 355 } | |
| 356 | |
| 357 #endif |