Mercurial > cpython-lru_cache-weakref
annotate Objects/object.c @ 1590:ac2e5cc29949 legacy-trunk
Added tests for missing host to open_http and open_gopher
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Mon, 18 Apr 1994 09:39:56 +0000 |
| parents | aac8231a715c |
| children | b724599401ff |
| rev | line source |
|---|---|
| 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 |
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37 #ifdef COUNT_ALLOCS |
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38 static typeobject *type_list; |
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39 extern int tuple_zero_allocs, fast_tuple_allocs; |
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40 extern int quick_int_allocs, quick_neg_int_allocs; |
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41 extern int null_strings, one_strings; |
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42 void |
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43 dump_counts() |
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44 { |
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45 typeobject *tp; |
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46 |
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47 for (tp = type_list; tp; tp = tp->tp_next) |
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48 fprintf(stderr, "%s alloc'd: %d, freed: %d, max in use: %d\n", |
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49 tp->tp_name, tp->tp_alloc, tp->tp_free, |
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50 tp->tp_maxalloc); |
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51 fprintf(stderr, "fast tuple allocs: %d, empty: %d\n", |
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52 fast_tuple_allocs, tuple_zero_allocs); |
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53 fprintf(stderr, "fast int allocs: pos: %d, neg: %d\n", |
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54 quick_int_allocs, quick_neg_int_allocs); |
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55 fprintf(stderr, "null strings: %d, 1-strings: %d\n", |
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56 null_strings, one_strings); |
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57 } |
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58 |
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59 void |
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60 inc_count(tp) |
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61 typeobject *tp; |
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62 { |
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63 if (tp->tp_alloc == 0) { |
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64 /* first time; hang in linked list */ |
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65 if (tp->tp_next != NULL) /* sanity check */ |
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66 abort(); |
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67 tp->tp_next = type_list; |
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68 type_list = tp; |
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69 } |
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70 tp->tp_alloc++; |
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71 if (tp->tp_alloc - tp->tp_free > tp->tp_maxalloc) |
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72 tp->tp_maxalloc = tp->tp_alloc - tp->tp_free; |
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73 } |
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74 #endif |
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75 |
| 6 | 76 object * |
| 77 newobject(tp) | |
| 78 typeobject *tp; | |
| 79 { | |
| 80 object *op = (object *) malloc(tp->tp_basicsize); | |
| 81 if (op == NULL) | |
| 82 return err_nomem(); | |
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83 op->ob_type = tp; |
| 6 | 84 NEWREF(op); |
| 85 return op; | |
| 86 } | |
| 87 | |
| 88 varobject * | |
| 89 newvarobject(tp, size) | |
| 90 typeobject *tp; | |
| 91 unsigned int size; | |
| 92 { | |
| 93 varobject *op = (varobject *) | |
| 94 malloc(tp->tp_basicsize + size * tp->tp_itemsize); | |
| 95 if (op == NULL) | |
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96 return (varobject *)err_nomem(); |
| 6 | 97 op->ob_type = tp; |
| 98 op->ob_size = size; | |
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99 NEWREF(op); |
| 6 | 100 return op; |
| 101 } | |
| 102 | |
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103 int |
| 6 | 104 printobject(op, fp, flags) |
| 105 object *op; | |
| 106 FILE *fp; | |
| 107 int flags; | |
| 108 { | |
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109 int ret = 0; |
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110 if (intrcheck()) { |
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111 err_set(KeyboardInterrupt); |
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112 return -1; |
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113 } |
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114 if (op == NULL) { |
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115 fprintf(fp, "<nil>"); |
| 6 | 116 } |
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117 else { |
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118 if (op->ob_refcnt <= 0) |
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119 fprintf(fp, "<refcnt %u at %lx>", |
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120 op->ob_refcnt, (long)op); |
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121 else if (op->ob_type->tp_print == NULL) { |
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122 if (op->ob_type->tp_repr == NULL) { |
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123 fprintf(fp, "<%s object at %lx>", |
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124 op->ob_type->tp_name, (long)op); |
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125 } |
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126 else { |
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127 object *s; |
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128 if (flags & PRINT_RAW) |
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129 s = strobject(op); |
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130 else |
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131 s = reprobject(op); |
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132 if (s == NULL) |
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133 ret = -1; |
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134 else if (!is_stringobject(s)) { |
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135 err_setstr(TypeError, |
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136 "repr not string"); |
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137 ret = -1; |
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138 } |
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139 else { |
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140 fprintf(fp, "%s", getstringvalue(s)); |
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141 } |
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142 XDECREF(s); |
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143 } |
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144 } |
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145 else |
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146 ret = (*op->ob_type->tp_print)(op, fp, flags); |
| 6 | 147 } |
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148 if (ret == 0) { |
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149 if (ferror(fp)) { |
| 473 | 150 err_errno(IOError); |
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151 clearerr(fp); |
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152 ret = -1; |
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153 } |
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154 } |
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155 return ret; |
| 6 | 156 } |
| 157 | |
| 158 object * | |
| 159 reprobject(v) | |
| 160 object *v; | |
| 161 { | |
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162 if (intrcheck()) { |
| 6 | 163 err_set(KeyboardInterrupt); |
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164 return NULL; |
| 6 | 165 } |
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166 if (v == NULL) |
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167 return newstringobject("<NULL>"); |
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168 else if (v->ob_type->tp_repr == NULL) { |
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169 char buf[120]; |
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170 sprintf(buf, "<%.80s object at %lx>", |
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171 v->ob_type->tp_name, (long)v); |
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172 return newstringobject(buf); |
| 6 | 173 } |
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174 else |
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175 return (*v->ob_type->tp_repr)(v); |
| 6 | 176 } |
| 177 | |
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178 object * |
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179 strobject(v) |
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180 object *v; |
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181 { |
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182 if (v == NULL) |
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183 return newstringobject("<NULL>"); |
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184 if (is_stringobject(v)) { |
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185 INCREF(v); |
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186 return v; |
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187 } |
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188 else { |
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189 object *func = getattr(v, "__str__"); |
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190 object *args; |
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191 object *res; |
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192 if (func == NULL) { |
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193 err_clear(); |
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194 return reprobject(v); |
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195 } |
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196 args = newtupleobject(0); |
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197 if (args == NULL) |
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198 res = NULL; |
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199 else { |
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200 res = call_object(func, args); |
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201 DECREF(args); |
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202 } |
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203 DECREF(func); |
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204 return res; |
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205 } |
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206 } |
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207 |
| 6 | 208 int |
| 209 cmpobject(v, w) | |
| 210 object *v, *w; | |
| 211 { | |
| 212 typeobject *tp; | |
| 213 if (v == w) | |
| 214 return 0; | |
| 215 if (v == NULL) | |
| 216 return -1; | |
| 217 if (w == NULL) | |
| 218 return 1; | |
|
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219 if ((tp = v->ob_type) != w->ob_type) { |
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220 if (tp->tp_as_number != NULL && |
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221 w->ob_type->tp_as_number != NULL) { |
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222 if (coerce(&v, &w) != 0) { |
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223 err_clear(); |
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224 /* XXX Should report the error, |
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225 XXX but the interface isn't there... */ |
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226 } |
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227 else { |
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228 int cmp = (*v->ob_type->tp_compare)(v, w); |
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229 DECREF(v); |
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230 DECREF(w); |
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231 return cmp; |
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232 } |
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233 } |
| 6 | 234 return strcmp(tp->tp_name, w->ob_type->tp_name); |
|
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235 } |
| 6 | 236 if (tp->tp_compare == NULL) |
| 237 return (v < w) ? -1 : 1; | |
|
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238 return (*tp->tp_compare)(v, w); |
| 6 | 239 } |
| 240 | |
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241 long |
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242 hashobject(v) |
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243 object *v; |
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244 { |
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245 typeobject *tp = v->ob_type; |
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246 if (tp->tp_hash != NULL) |
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247 return (*tp->tp_hash)(v); |
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248 if (tp->tp_compare == NULL) |
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249 return (long) v; /* Use address as hash value */ |
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250 /* If there's a cmp but no hash defined, the object can't be hashed */ |
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251 err_setstr(TypeError, "unhashable type"); |
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252 return -1; |
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253 } |
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254 |
| 86 | 255 object * |
| 256 getattr(v, name) | |
| 257 object *v; | |
| 258 char *name; | |
| 259 { | |
| 260 if (v->ob_type->tp_getattr == NULL) { | |
| 261 err_setstr(TypeError, "attribute-less object"); | |
| 262 return NULL; | |
| 263 } | |
| 264 else { | |
| 265 return (*v->ob_type->tp_getattr)(v, name); | |
| 266 } | |
| 267 } | |
| 268 | |
| 269 int | |
|
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270 hasattr(v, name) |
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271 object *v; |
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272 char *name; |
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273 { |
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274 object *res = getattr(v, name); |
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275 if (res != NULL) { |
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276 DECREF(res); |
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277 return 1; |
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278 } |
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279 err_clear(); |
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280 return 0; |
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281 } |
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282 |
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283 int |
| 86 | 284 setattr(v, name, w) |
| 285 object *v; | |
| 286 char *name; | |
| 287 object *w; | |
| 288 { | |
| 289 if (v->ob_type->tp_setattr == NULL) { | |
| 290 if (v->ob_type->tp_getattr == NULL) | |
|
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291 err_setstr(TypeError, |
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292 "attribute-less object (assign or del)"); |
| 86 | 293 else |
|
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294 err_setstr(TypeError, |
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295 "object has read-only attributes"); |
| 95 | 296 return -1; |
| 86 | 297 } |
| 298 else { | |
| 299 return (*v->ob_type->tp_setattr)(v, name, w); | |
| 300 } | |
| 301 } | |
| 302 | |
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303 /* Test a value used as condition, e.g., in a for or if statement. |
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304 Return -1 if an error occurred */ |
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305 |
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306 int |
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307 testbool(v) |
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308 object *v; |
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309 { |
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310 int res; |
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311 if (v == None) |
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312 res = 0; |
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313 else if (v->ob_type->tp_as_number != NULL) |
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314 res = (*v->ob_type->tp_as_number->nb_nonzero)(v); |
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315 else if (v->ob_type->tp_as_mapping != NULL) |
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316 res = (*v->ob_type->tp_as_mapping->mp_length)(v); |
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317 else if (v->ob_type->tp_as_sequence != NULL) |
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318 res = (*v->ob_type->tp_as_sequence->sq_length)(v); |
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319 else |
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320 res = 1; |
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321 if (res > 0) |
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322 res = 1; |
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323 return res; |
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324 } |
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325 |
| 6 | 326 |
| 327 /* | |
| 328 NoObject is usable as a non-NULL undefined value, used by the macro None. | |
| 329 There is (and should be!) no way to create other objects of this type, | |
| 86 | 330 so there is exactly one (which is indestructible, by the way). |
| 6 | 331 */ |
| 332 | |
| 739 | 333 /* ARGSUSED */ |
| 86 | 334 static object * |
| 335 none_repr(op) | |
| 336 object *op; | |
| 337 { | |
| 338 return newstringobject("None"); | |
| 6 | 339 } |
| 340 | |
| 341 static typeobject Notype = { | |
| 342 OB_HEAD_INIT(&Typetype) | |
| 343 0, | |
| 86 | 344 "None", |
| 6 | 345 0, |
| 346 0, | |
| 347 0, /*tp_dealloc*/ /*never called*/ | |
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348 0, /*tp_print*/ |
| 86 | 349 0, /*tp_getattr*/ |
| 350 0, /*tp_setattr*/ | |
| 351 0, /*tp_compare*/ | |
| 352 none_repr, /*tp_repr*/ | |
| 353 0, /*tp_as_number*/ | |
| 354 0, /*tp_as_sequence*/ | |
| 355 0, /*tp_as_mapping*/ | |
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356 0, /*tp_hash */ |
| 6 | 357 }; |
| 358 | |
| 359 object NoObject = { | |
| 360 OB_HEAD_INIT(&Notype) | |
| 361 }; | |
| 362 | |
| 363 | |
| 364 #ifdef TRACE_REFS | |
| 365 | |
| 366 static object refchain = {&refchain, &refchain}; | |
| 367 | |
| 368 NEWREF(op) | |
| 369 object *op; | |
| 370 { | |
| 371 ref_total++; | |
| 372 op->ob_refcnt = 1; | |
| 373 op->_ob_next = refchain._ob_next; | |
| 374 op->_ob_prev = &refchain; | |
| 375 refchain._ob_next->_ob_prev = op; | |
| 376 refchain._ob_next = op; | |
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377 #ifdef COUNT_ALLOCS |
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378 inc_count(op->ob_type); |
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379 #endif |
| 6 | 380 } |
| 381 | |
| 86 | 382 UNREF(op) |
| 383 register object *op; | |
| 6 | 384 { |
| 86 | 385 register object *p; |
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386 if (op->ob_refcnt < 0) { |
| 86 | 387 fprintf(stderr, "UNREF negative refcnt\n"); |
| 388 abort(); | |
| 389 } | |
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390 if (op == &refchain || |
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391 op->_ob_prev->_ob_next != op || op->_ob_next->_ob_prev != op) { |
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392 fprintf(stderr, "UNREF invalid object\n"); |
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393 abort(); |
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394 } |
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395 #ifdef SLOW_UNREF_CHECK |
| 86 | 396 for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) { |
| 397 if (p == op) | |
| 398 break; | |
| 399 } | |
| 400 if (p == &refchain) { /* Not found */ | |
| 401 fprintf(stderr, "UNREF unknown object\n"); | |
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402 abort(); |
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403 } |
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404 #endif |
| 6 | 405 op->_ob_next->_ob_prev = op->_ob_prev; |
| 406 op->_ob_prev->_ob_next = op->_ob_next; | |
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407 op->_ob_next = op->_ob_prev = NULL; |
| 86 | 408 } |
| 409 | |
| 410 DELREF(op) | |
| 411 object *op; | |
| 412 { | |
| 413 UNREF(op); | |
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414 #ifdef COUNT_ALLOCS |
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415 op->ob_type->tp_free++; |
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416 #endif |
| 6 | 417 (*(op)->ob_type->tp_dealloc)(op); |
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418 op->ob_type = NULL; |
| 6 | 419 } |
| 420 | |
| 421 printrefs(fp) | |
| 422 FILE *fp; | |
| 423 { | |
| 424 object *op; | |
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425 fprintf(fp, "Remaining objects (except strings referenced once):\n"); |
| 6 | 426 for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) { |
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427 if (op->ob_refcnt == 1 && is_stringobject(op)) |
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428 continue; /* Will be printed elsewhere */ |
| 6 | 429 fprintf(fp, "[%d] ", op->ob_refcnt); |
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430 if (printobject(op, fp, 0) != 0) |
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431 err_clear(); |
| 6 | 432 putc('\n', fp); |
| 433 } | |
| 434 } | |
| 435 | |
| 436 #endif |