Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 1 | /* Generic object operations; and implementation of None (NoObject) */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 2 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 3 | #include "allobjects.h" |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 4 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 5 | #ifdef REF_DEBUG |
| 6 | long ref_total; |
| 7 | #endif |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 8 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 9 | /* Object allocation routines used by NEWOBJ and NEWVAROBJ macros. |
| 10 | These are used by the individual routines for object creation. |
| 11 | Do not call them otherwise, they do not initialize the object! */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 12 | |
| 13 | object * |
| 14 | newobject(tp) |
| 15 | typeobject *tp; |
| 16 | { |
| 17 | object *op = (object *) malloc(tp->tp_basicsize); |
| 18 | if (op == NULL) |
| 19 | return err_nomem(); |
| 20 | NEWREF(op); |
| 21 | op->ob_type = tp; |
| 22 | return op; |
| 23 | } |
| 24 | |
| 25 | #if 0 /* unused */ |
| 26 | |
| 27 | varobject * |
| 28 | newvarobject(tp, size) |
| 29 | typeobject *tp; |
| 30 | unsigned int size; |
| 31 | { |
| 32 | varobject *op = (varobject *) |
| 33 | malloc(tp->tp_basicsize + size * tp->tp_itemsize); |
| 34 | if (op == NULL) |
| 35 | return err_nomem(); |
| 36 | NEWREF(op); |
| 37 | op->ob_type = tp; |
| 38 | op->ob_size = size; |
| 39 | return op; |
| 40 | } |
| 41 | |
| 42 | #endif |
| 43 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 44 | int StopPrint; /* Flag to indicate printing must be stopped */ |
| 45 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 46 | static int prlevel; |
| 47 | |
| 48 | void |
| 49 | printobject(op, fp, flags) |
| 50 | object *op; |
| 51 | FILE *fp; |
| 52 | int flags; |
| 53 | { |
| 54 | /* Hacks to make printing a long or recursive object interruptible */ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 55 | /* XXX Interrupts should leave a more permanent error */ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 56 | prlevel++; |
| 57 | if (!StopPrint && intrcheck()) { |
| 58 | fprintf(fp, "\n[print interrupted]\n"); |
| 59 | StopPrint = 1; |
| 60 | } |
| 61 | if (!StopPrint) { |
| 62 | if (op == NULL) { |
| 63 | fprintf(fp, "<nil>"); |
| 64 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 65 | else { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 66 | if (op->ob_refcnt <= 0) |
| 67 | fprintf(fp, "(refcnt %d):", op->ob_refcnt); |
| 68 | if (op->ob_type->tp_print == NULL) { |
| 69 | fprintf(fp, "<%s object at %lx>", |
| 70 | op->ob_type->tp_name, (long)op); |
| 71 | } |
| 72 | else { |
| 73 | (*op->ob_type->tp_print)(op, fp, flags); |
| 74 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 75 | } |
| 76 | } |
| 77 | prlevel--; |
| 78 | if (prlevel == 0) |
| 79 | StopPrint = 0; |
| 80 | } |
| 81 | |
| 82 | object * |
| 83 | reprobject(v) |
| 84 | object *v; |
| 85 | { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 86 | object *w = NULL; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 87 | /* Hacks to make converting a long or recursive object interruptible */ |
| 88 | prlevel++; |
| 89 | if (!StopPrint && intrcheck()) { |
| 90 | StopPrint = 1; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 91 | err_set(KeyboardInterrupt); |
| 92 | } |
| 93 | if (!StopPrint) { |
| 94 | if (v == NULL) { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 95 | w = newstringobject("<NULL>"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 96 | } |
| 97 | else if (v->ob_type->tp_repr == NULL) { |
| 98 | char buf[100]; |
| 99 | sprintf(buf, "<%.80s object at %lx>", |
| 100 | v->ob_type->tp_name, (long)v); |
| 101 | w = newstringobject(buf); |
| 102 | } |
| 103 | else { |
| 104 | w = (*v->ob_type->tp_repr)(v); |
| 105 | } |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 106 | if (StopPrint) { |
| 107 | XDECREF(w); |
| 108 | w = NULL; |
| 109 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 110 | } |
| 111 | prlevel--; |
| 112 | if (prlevel == 0) |
| 113 | StopPrint = 0; |
| 114 | return w; |
| 115 | } |
| 116 | |
| 117 | int |
| 118 | cmpobject(v, w) |
| 119 | object *v, *w; |
| 120 | { |
| 121 | typeobject *tp; |
| 122 | if (v == w) |
| 123 | return 0; |
| 124 | if (v == NULL) |
| 125 | return -1; |
| 126 | if (w == NULL) |
| 127 | return 1; |
| 128 | if ((tp = v->ob_type) != w->ob_type) |
| 129 | return strcmp(tp->tp_name, w->ob_type->tp_name); |
| 130 | if (tp->tp_compare == NULL) |
| 131 | return (v < w) ? -1 : 1; |
| 132 | return ((*tp->tp_compare)(v, w)); |
| 133 | } |
| 134 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 135 | object * |
| 136 | getattr(v, name) |
| 137 | object *v; |
| 138 | char *name; |
| 139 | { |
| 140 | if (v->ob_type->tp_getattr == NULL) { |
| 141 | err_setstr(TypeError, "attribute-less object"); |
| 142 | return NULL; |
| 143 | } |
| 144 | else { |
| 145 | return (*v->ob_type->tp_getattr)(v, name); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | int |
| 150 | setattr(v, name, w) |
| 151 | object *v; |
| 152 | char *name; |
| 153 | object *w; |
| 154 | { |
| 155 | if (v->ob_type->tp_setattr == NULL) { |
| 156 | if (v->ob_type->tp_getattr == NULL) |
| 157 | err_setstr(TypeError, "attribute-less object"); |
| 158 | else |
| 159 | err_setstr(TypeError, "object has read-only attributes"); |
Guido van Rossum | 73531a3 | 1990-12-20 23:12:40 +0000 | [diff] [blame] | 160 | return -1; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 161 | } |
| 162 | else { |
| 163 | return (*v->ob_type->tp_setattr)(v, name, w); |
| 164 | } |
| 165 | } |
| 166 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 167 | |
| 168 | /* |
| 169 | NoObject is usable as a non-NULL undefined value, used by the macro None. |
| 170 | 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] | 171 | so there is exactly one (which is indestructible, by the way). |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 172 | */ |
| 173 | |
| 174 | static void |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 175 | none_print(op, fp, flags) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 176 | object *op; |
| 177 | FILE *fp; |
| 178 | int flags; |
| 179 | { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 180 | fprintf(fp, "None"); |
| 181 | } |
| 182 | |
| 183 | static object * |
| 184 | none_repr(op) |
| 185 | object *op; |
| 186 | { |
| 187 | return newstringobject("None"); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | static typeobject Notype = { |
| 191 | OB_HEAD_INIT(&Typetype) |
| 192 | 0, |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 193 | "None", |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 194 | 0, |
| 195 | 0, |
| 196 | 0, /*tp_dealloc*/ /*never called*/ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 197 | none_print, /*tp_print*/ |
| 198 | 0, /*tp_getattr*/ |
| 199 | 0, /*tp_setattr*/ |
| 200 | 0, /*tp_compare*/ |
| 201 | none_repr, /*tp_repr*/ |
| 202 | 0, /*tp_as_number*/ |
| 203 | 0, /*tp_as_sequence*/ |
| 204 | 0, /*tp_as_mapping*/ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 205 | }; |
| 206 | |
| 207 | object NoObject = { |
| 208 | OB_HEAD_INIT(&Notype) |
| 209 | }; |
| 210 | |
| 211 | |
| 212 | #ifdef TRACE_REFS |
| 213 | |
| 214 | static object refchain = {&refchain, &refchain}; |
| 215 | |
| 216 | NEWREF(op) |
| 217 | object *op; |
| 218 | { |
| 219 | ref_total++; |
| 220 | op->ob_refcnt = 1; |
| 221 | op->_ob_next = refchain._ob_next; |
| 222 | op->_ob_prev = &refchain; |
| 223 | refchain._ob_next->_ob_prev = op; |
| 224 | refchain._ob_next = op; |
| 225 | } |
| 226 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 227 | UNREF(op) |
| 228 | register object *op; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 229 | { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 230 | register object *p; |
Guido van Rossum | bd3edc8 | 1990-11-02 17:49:51 +0000 | [diff] [blame] | 231 | if (op->ob_refcnt < 0) { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 232 | fprintf(stderr, "UNREF negative refcnt\n"); |
| 233 | abort(); |
| 234 | } |
| 235 | for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) { |
| 236 | if (p == op) |
| 237 | break; |
| 238 | } |
| 239 | if (p == &refchain) { /* Not found */ |
| 240 | fprintf(stderr, "UNREF unknown object\n"); |
Guido van Rossum | bd3edc8 | 1990-11-02 17:49:51 +0000 | [diff] [blame] | 241 | abort(); |
| 242 | } |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 243 | op->_ob_next->_ob_prev = op->_ob_prev; |
| 244 | op->_ob_prev->_ob_next = op->_ob_next; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | DELREF(op) |
| 248 | object *op; |
| 249 | { |
| 250 | UNREF(op); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 251 | (*(op)->ob_type->tp_dealloc)(op); |
| 252 | } |
| 253 | |
| 254 | printrefs(fp) |
| 255 | FILE *fp; |
| 256 | { |
| 257 | object *op; |
| 258 | fprintf(fp, "Remaining objects:\n"); |
| 259 | for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) { |
| 260 | fprintf(fp, "[%d] ", op->ob_refcnt); |
| 261 | printobject(op, fp, 0); |
| 262 | putc('\n', fp); |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | #endif |