Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 1 | /* |
| 2 | |
| 3 | Reference Cycle Garbage Collection |
| 4 | ================================== |
| 5 | |
Neil Schemenauer | b2c2c9e | 2000-10-04 16:34:09 +0000 | [diff] [blame] | 6 | Neil Schemenauer <nas@arctrix.com> |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 7 | |
| 8 | Based on a post on the python-dev list. Ideas from Guido van Rossum, |
| 9 | Eric Tiedemann, and various others. |
| 10 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 11 | http://www.arctrix.com/nas/python/gc/ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 12 | http://www.python.org/pipermail/python-dev/2000-March/003869.html |
| 13 | http://www.python.org/pipermail/python-dev/2000-March/004010.html |
| 14 | http://www.python.org/pipermail/python-dev/2000-March/004022.html |
| 15 | |
| 16 | For a highlevel view of the collection process, read the collect |
| 17 | function. |
| 18 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 19 | */ |
| 20 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 21 | #include "Python.h" |
| 22 | |
| 23 | #ifdef WITH_CYCLE_GC |
| 24 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 25 | /* Get an object's GC head */ |
| 26 | #define AS_GC(o) ((PyGC_Head *)(o)-1) |
| 27 | |
| 28 | /* Get the object given the GC head */ |
| 29 | #define FROM_GC(g) ((PyObject *)(((PyGC_Head *)g)+1)) |
| 30 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 31 | |
| 32 | /*** Global GC state ***/ |
| 33 | |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 34 | struct gc_generation { |
| 35 | PyGC_Head head; |
| 36 | int threshold; /* collection threshold */ |
| 37 | int count; /* count of allocations or collections of younger |
| 38 | generations */ |
| 39 | }; |
| 40 | |
| 41 | #define NUM_GENERATIONS 3 |
| 42 | #define GEN_HEAD(n) (&generations[n].head) |
| 43 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 44 | /* linked lists of container objects */ |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 45 | static struct gc_generation generations[NUM_GENERATIONS] = { |
| 46 | /* PyGC_Head, threshold, count */ |
| 47 | {{{GEN_HEAD(0), GEN_HEAD(0), 0}}, 700, 0}, |
| 48 | {{{GEN_HEAD(1), GEN_HEAD(1), 0}}, 10, 0}, |
| 49 | {{{GEN_HEAD(2), GEN_HEAD(2), 0}}, 10, 0}, |
| 50 | }; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 51 | |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 52 | PyGC_Head *_PyGC_generation0 = GEN_HEAD(0); |
| 53 | |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 54 | static int enabled = 1; /* automatic collection enabled? */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 55 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 56 | /* true if we are currently running the collector */ |
| 57 | static int collecting; |
| 58 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 59 | /* set for debugging information */ |
| 60 | #define DEBUG_STATS (1<<0) /* print collection statistics */ |
| 61 | #define DEBUG_COLLECTABLE (1<<1) /* print collectable objects */ |
| 62 | #define DEBUG_UNCOLLECTABLE (1<<2) /* print uncollectable objects */ |
| 63 | #define DEBUG_INSTANCES (1<<3) /* print instances */ |
| 64 | #define DEBUG_OBJECTS (1<<4) /* print other objects */ |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 65 | #define DEBUG_SAVEALL (1<<5) /* save all garbage in gc.garbage */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 66 | #define DEBUG_LEAK DEBUG_COLLECTABLE | \ |
| 67 | DEBUG_UNCOLLECTABLE | \ |
| 68 | DEBUG_INSTANCES | \ |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 69 | DEBUG_OBJECTS | \ |
| 70 | DEBUG_SAVEALL |
Jeremy Hylton | b709df3 | 2000-09-01 02:47:25 +0000 | [diff] [blame] | 71 | static int debug; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 72 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 73 | /* Special gc_refs value */ |
| 74 | #define GC_MOVED -123 |
| 75 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 76 | /* list of uncollectable objects */ |
| 77 | static PyObject *garbage; |
| 78 | |
Jeremy Hylton | b709df3 | 2000-09-01 02:47:25 +0000 | [diff] [blame] | 79 | /* Python string to use if unhandled exception occurs */ |
| 80 | static PyObject *gc_str; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 81 | |
| 82 | /*** list functions ***/ |
| 83 | |
| 84 | static void |
| 85 | gc_list_init(PyGC_Head *list) |
| 86 | { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 87 | list->gc.gc_prev = list; |
| 88 | list->gc.gc_next = list; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 89 | } |
| 90 | |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 91 | static int |
| 92 | gc_list_is_empty(PyGC_Head *list) |
| 93 | { |
| 94 | return (list->gc.gc_next == list); |
| 95 | } |
| 96 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 97 | static void |
| 98 | gc_list_append(PyGC_Head *node, PyGC_Head *list) |
| 99 | { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 100 | node->gc.gc_next = list; |
| 101 | node->gc.gc_prev = list->gc.gc_prev; |
| 102 | node->gc.gc_prev->gc.gc_next = node; |
| 103 | list->gc.gc_prev = node; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | static void |
| 107 | gc_list_remove(PyGC_Head *node) |
| 108 | { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 109 | node->gc.gc_prev->gc.gc_next = node->gc.gc_next; |
| 110 | node->gc.gc_next->gc.gc_prev = node->gc.gc_prev; |
| 111 | node->gc.gc_next = NULL; /* object is not currently tracked */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | static void |
| 115 | gc_list_move(PyGC_Head *from, PyGC_Head *to) |
| 116 | { |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 117 | if (gc_list_is_empty(from)) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 118 | gc_list_init(to); |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 119 | } |
| 120 | else { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 121 | to->gc.gc_next = from->gc.gc_next; |
| 122 | to->gc.gc_next->gc.gc_prev = to; |
| 123 | to->gc.gc_prev = from->gc.gc_prev; |
| 124 | to->gc.gc_prev->gc.gc_next = to; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 125 | } |
| 126 | gc_list_init(from); |
| 127 | } |
| 128 | |
| 129 | /* append a list onto another list, from becomes an empty list */ |
| 130 | static void |
| 131 | gc_list_merge(PyGC_Head *from, PyGC_Head *to) |
| 132 | { |
| 133 | PyGC_Head *tail; |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 134 | if (!gc_list_is_empty(from)) { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 135 | tail = to->gc.gc_prev; |
| 136 | tail->gc.gc_next = from->gc.gc_next; |
| 137 | tail->gc.gc_next->gc.gc_prev = tail; |
| 138 | to->gc.gc_prev = from->gc.gc_prev; |
| 139 | to->gc.gc_prev->gc.gc_next = to; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 140 | } |
| 141 | gc_list_init(from); |
| 142 | } |
| 143 | |
| 144 | static long |
| 145 | gc_list_size(PyGC_Head *list) |
| 146 | { |
| 147 | PyGC_Head *gc; |
| 148 | long n = 0; |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 149 | for (gc = list->gc.gc_next; gc != list; gc = gc->gc.gc_next) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 150 | n++; |
| 151 | } |
| 152 | return n; |
| 153 | } |
| 154 | |
| 155 | /*** end of list stuff ***/ |
| 156 | |
| 157 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 158 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 159 | /* Set all gc_refs = ob_refcnt */ |
| 160 | static void |
| 161 | update_refs(PyGC_Head *containers) |
| 162 | { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 163 | PyGC_Head *gc = containers->gc.gc_next; |
| 164 | for (; gc != containers; gc=gc->gc.gc_next) { |
| 165 | gc->gc.gc_refs = FROM_GC(gc)->ob_refcnt; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 166 | } |
| 167 | } |
| 168 | |
| 169 | static int |
| 170 | visit_decref(PyObject *op, void *data) |
| 171 | { |
| 172 | if (op && PyObject_IS_GC(op)) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 173 | PyGC_Head *gc = AS_GC(op); |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 174 | if (gc->gc.gc_next != NULL) |
| 175 | AS_GC(op)->gc.gc_refs--; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 176 | } |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | /* Subtract internal references from gc_refs */ |
| 181 | static void |
| 182 | subtract_refs(PyGC_Head *containers) |
| 183 | { |
| 184 | traverseproc traverse; |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 185 | PyGC_Head *gc = containers->gc.gc_next; |
| 186 | for (; gc != containers; gc=gc->gc.gc_next) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 187 | traverse = FROM_GC(gc)->ob_type->tp_traverse; |
| 188 | (void) traverse(FROM_GC(gc), |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 189 | (visitproc)visit_decref, |
| 190 | NULL); |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | /* Append objects with gc_refs > 0 to roots list */ |
| 195 | static void |
| 196 | move_roots(PyGC_Head *containers, PyGC_Head *roots) |
| 197 | { |
| 198 | PyGC_Head *next; |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 199 | PyGC_Head *gc = containers->gc.gc_next; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 200 | while (gc != containers) { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 201 | next = gc->gc.gc_next; |
| 202 | if (gc->gc.gc_refs > 0) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 203 | gc_list_remove(gc); |
| 204 | gc_list_append(gc, roots); |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 205 | gc->gc.gc_refs = GC_MOVED; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 206 | } |
| 207 | gc = next; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | static int |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 212 | visit_move(PyObject *op, PyGC_Head *tolist) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 213 | { |
| 214 | if (PyObject_IS_GC(op)) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 215 | PyGC_Head *gc = AS_GC(op); |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 216 | if (gc->gc.gc_next != NULL && gc->gc.gc_refs != GC_MOVED) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 217 | gc_list_remove(gc); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 218 | gc_list_append(gc, tolist); |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 219 | gc->gc.gc_refs = GC_MOVED; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 220 | } |
| 221 | } |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | /* Move objects referenced from reachable to reachable set. */ |
| 226 | static void |
| 227 | move_root_reachable(PyGC_Head *reachable) |
| 228 | { |
| 229 | traverseproc traverse; |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 230 | PyGC_Head *gc = reachable->gc.gc_next; |
| 231 | for (; gc != reachable; gc=gc->gc.gc_next) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 232 | /* careful, reachable list is growing here */ |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 233 | PyObject *op = FROM_GC(gc); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 234 | traverse = op->ob_type->tp_traverse; |
| 235 | (void) traverse(op, |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 236 | (visitproc)visit_move, |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 237 | (void *)reachable); |
| 238 | } |
| 239 | } |
| 240 | |
Neil Schemenauer | a765c12 | 2001-11-01 17:35:23 +0000 | [diff] [blame] | 241 | /* return true of object has a finalization method */ |
| 242 | static int |
| 243 | has_finalizer(PyObject *op) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 244 | { |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 245 | static PyObject *delstr = NULL; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 246 | if (delstr == NULL) { |
| 247 | delstr = PyString_InternFromString("__del__"); |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 248 | if (delstr == NULL) |
| 249 | Py_FatalError("PyGC: can't initialize __del__ string"); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 250 | } |
Tim Peters | db86561 | 2001-11-01 19:35:45 +0000 | [diff] [blame] | 251 | return (PyInstance_Check(op) || |
| 252 | PyType_HasFeature(op->ob_type, Py_TPFLAGS_HEAPTYPE)) |
| 253 | && PyObject_HasAttr(op, delstr); |
Neil Schemenauer | a765c12 | 2001-11-01 17:35:23 +0000 | [diff] [blame] | 254 | } |
| 255 | |
| 256 | /* Move all objects with finalizers (instances with __del__) */ |
| 257 | static void |
| 258 | move_finalizers(PyGC_Head *unreachable, PyGC_Head *finalizers) |
| 259 | { |
| 260 | PyGC_Head *next; |
| 261 | PyGC_Head *gc = unreachable->gc.gc_next; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 262 | for (; gc != unreachable; gc=next) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 263 | PyObject *op = FROM_GC(gc); |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 264 | next = gc->gc.gc_next; |
Neil Schemenauer | a765c12 | 2001-11-01 17:35:23 +0000 | [diff] [blame] | 265 | if (has_finalizer(op)) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 266 | gc_list_remove(gc); |
| 267 | gc_list_append(gc, finalizers); |
| 268 | } |
| 269 | } |
| 270 | } |
| 271 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 272 | /* Move objects referenced from roots to roots */ |
| 273 | static void |
| 274 | move_finalizer_reachable(PyGC_Head *finalizers) |
| 275 | { |
| 276 | traverseproc traverse; |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 277 | PyGC_Head *gc = finalizers->gc.gc_next; |
| 278 | for (; gc != finalizers; gc=gc->gc.gc_next) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 279 | /* careful, finalizers list is growing here */ |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 280 | traverse = FROM_GC(gc)->ob_type->tp_traverse; |
| 281 | (void) traverse(FROM_GC(gc), |
| 282 | (visitproc)visit_move, |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 283 | (void *)finalizers); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | static void |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 288 | debug_instance(char *msg, PyInstanceObject *inst) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 289 | { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 290 | char *cname; |
Neil Schemenauer | a765c12 | 2001-11-01 17:35:23 +0000 | [diff] [blame] | 291 | /* simple version of instance_repr */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 292 | PyObject *classname = inst->in_class->cl_name; |
| 293 | if (classname != NULL && PyString_Check(classname)) |
| 294 | cname = PyString_AsString(classname); |
| 295 | else |
| 296 | cname = "?"; |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 297 | PySys_WriteStderr("gc: %.100s <%.100s instance at %p>\n", |
| 298 | msg, cname, inst); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | static void |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 302 | debug_cycle(char *msg, PyObject *op) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 303 | { |
| 304 | if ((debug & DEBUG_INSTANCES) && PyInstance_Check(op)) { |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 305 | debug_instance(msg, (PyInstanceObject *)op); |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 306 | } |
| 307 | else if (debug & DEBUG_OBJECTS) { |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 308 | PySys_WriteStderr("gc: %.100s <%.100s %p>\n", |
| 309 | msg, op->ob_type->tp_name, op); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 310 | } |
| 311 | } |
| 312 | |
| 313 | /* Handle uncollectable garbage (cycles with finalizers). */ |
| 314 | static void |
| 315 | handle_finalizers(PyGC_Head *finalizers, PyGC_Head *old) |
| 316 | { |
| 317 | PyGC_Head *gc; |
| 318 | if (garbage == NULL) { |
| 319 | garbage = PyList_New(0); |
| 320 | } |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 321 | for (gc = finalizers->gc.gc_next; gc != finalizers; |
| 322 | gc = finalizers->gc.gc_next) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 323 | PyObject *op = FROM_GC(gc); |
Neil Schemenauer | a765c12 | 2001-11-01 17:35:23 +0000 | [diff] [blame] | 324 | if ((debug & DEBUG_SAVEALL) || has_finalizer(op)) { |
| 325 | /* If SAVEALL is not set then just append objects with |
| 326 | * finalizers to the list of garbage. All objects in |
| 327 | * the finalizers list are reachable from those |
| 328 | * objects. */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 329 | PyList_Append(garbage, op); |
| 330 | } |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 331 | /* object is now reachable again */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 332 | gc_list_remove(gc); |
| 333 | gc_list_append(gc, old); |
| 334 | } |
| 335 | } |
| 336 | |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 337 | /* Break reference cycles by clearing the containers involved. This is |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 338 | * tricky business as the lists can be changing and we don't know which |
| 339 | * objects may be freed. It is possible I screwed something up here. */ |
| 340 | static void |
| 341 | delete_garbage(PyGC_Head *unreachable, PyGC_Head *old) |
| 342 | { |
| 343 | inquiry clear; |
| 344 | |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 345 | while (!gc_list_is_empty(unreachable)) { |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 346 | PyGC_Head *gc = unreachable->gc.gc_next; |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 347 | PyObject *op = FROM_GC(gc); |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 348 | if (debug & DEBUG_SAVEALL) { |
| 349 | PyList_Append(garbage, op); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 350 | } |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 351 | else { |
| 352 | if ((clear = op->ob_type->tp_clear) != NULL) { |
| 353 | Py_INCREF(op); |
| 354 | clear((PyObject *)op); |
| 355 | Py_DECREF(op); |
| 356 | } |
| 357 | } |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 358 | if (unreachable->gc.gc_next == gc) { |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 359 | /* object is still alive, move it, it may die later */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 360 | gc_list_remove(gc); |
| 361 | gc_list_append(gc, old); |
| 362 | } |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | /* This is the main function. Read this to understand how the |
| 367 | * collection process works. */ |
| 368 | static long |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 369 | collect(int generation) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 370 | { |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 371 | int i; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 372 | long n = 0; |
| 373 | long m = 0; |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 374 | PyGC_Head *young; /* the generation we are examining */ |
| 375 | PyGC_Head *old; /* next older generation */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 376 | PyGC_Head reachable; |
| 377 | PyGC_Head unreachable; |
| 378 | PyGC_Head finalizers; |
| 379 | PyGC_Head *gc; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 380 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 381 | if (debug & DEBUG_STATS) { |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 382 | PySys_WriteStderr("gc: collecting generation %d...\n", |
| 383 | generation); |
| 384 | PySys_WriteStderr("gc: objects in each generation:"); |
| 385 | for (i = 0; i < NUM_GENERATIONS; i++) { |
| 386 | PySys_WriteStderr(" %ld", gc_list_size(GEN_HEAD(i))); |
| 387 | } |
| 388 | PySys_WriteStderr("\n"); |
| 389 | } |
| 390 | |
| 391 | /* update collection and allocation counters */ |
| 392 | if (generation+1 < NUM_GENERATIONS) |
| 393 | generations[generation+1].count += 1; |
| 394 | for (i = 0; i <= generation; i++) |
| 395 | generations[generation].count = 0; |
| 396 | |
| 397 | /* merge younger generations with one we are currently collecting */ |
| 398 | for (i = 0; i < generation; i++) { |
| 399 | gc_list_merge(GEN_HEAD(i), GEN_HEAD(generation)); |
| 400 | } |
| 401 | |
| 402 | /* handy references */ |
| 403 | young = GEN_HEAD(generation); |
| 404 | if (generation < NUM_GENERATIONS-1) { |
| 405 | old = GEN_HEAD(generation+1); |
| 406 | } else { |
| 407 | old = GEN_HEAD(NUM_GENERATIONS-1); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 408 | } |
| 409 | |
| 410 | /* Using ob_refcnt and gc_refs, calculate which objects in the |
| 411 | * container set are reachable from outside the set (ie. have a |
| 412 | * refcount greater than 0 when all the references within the |
| 413 | * set are taken into account */ |
| 414 | update_refs(young); |
| 415 | subtract_refs(young); |
| 416 | |
| 417 | /* Move everything reachable from outside the set into the |
| 418 | * reachable set (ie. gc_refs > 0). Next, move everything |
| 419 | * reachable from objects in the reachable set. */ |
| 420 | gc_list_init(&reachable); |
| 421 | move_roots(young, &reachable); |
| 422 | move_root_reachable(&reachable); |
| 423 | |
| 424 | /* move unreachable objects to a temporary list, new objects can be |
| 425 | * allocated after this point */ |
| 426 | gc_list_init(&unreachable); |
| 427 | gc_list_move(young, &unreachable); |
| 428 | |
| 429 | /* move reachable objects to next generation */ |
| 430 | gc_list_merge(&reachable, old); |
| 431 | |
| 432 | /* Move objects reachable from finalizers, we can't safely delete |
| 433 | * them. Python programmers should take care not to create such |
| 434 | * things. For Python finalizers means instance objects with |
| 435 | * __del__ methods. */ |
| 436 | gc_list_init(&finalizers); |
| 437 | move_finalizers(&unreachable, &finalizers); |
| 438 | move_finalizer_reachable(&finalizers); |
| 439 | |
| 440 | /* Collect statistics on collectable objects found and print |
| 441 | * debugging information. */ |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 442 | for (gc = unreachable.gc.gc_next; gc != &unreachable; |
| 443 | gc = gc->gc.gc_next) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 444 | m++; |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 445 | if (debug & DEBUG_COLLECTABLE) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 446 | debug_cycle("collectable", FROM_GC(gc)); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 447 | } |
| 448 | } |
| 449 | /* call tp_clear on objects in the collectable set. This will cause |
| 450 | * the reference cycles to be broken. It may also cause some objects in |
| 451 | * finalizers to be freed */ |
| 452 | delete_garbage(&unreachable, old); |
| 453 | |
| 454 | /* Collect statistics on uncollectable objects found and print |
| 455 | * debugging information. */ |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 456 | for (gc = finalizers.gc.gc_next; gc != &finalizers; |
| 457 | gc = gc->gc.gc_next) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 458 | n++; |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 459 | if (debug & DEBUG_UNCOLLECTABLE) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 460 | debug_cycle("uncollectable", FROM_GC(gc)); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 461 | } |
| 462 | } |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 463 | if (debug & DEBUG_STATS) { |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 464 | if (m == 0 && n == 0) { |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 465 | PySys_WriteStderr("gc: done.\n"); |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 466 | } |
| 467 | else { |
Jeremy Hylton | 0625777 | 2000-08-31 15:10:24 +0000 | [diff] [blame] | 468 | PySys_WriteStderr( |
| 469 | "gc: done, %ld unreachable, %ld uncollectable.\n", |
| 470 | n+m, n); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 471 | } |
| 472 | } |
| 473 | |
| 474 | /* Append instances in the uncollectable set to a Python |
| 475 | * reachable list of garbage. The programmer has to deal with |
| 476 | * this if they insist on creating this type of structure. */ |
| 477 | handle_finalizers(&finalizers, old); |
| 478 | |
Jeremy Hylton | b709df3 | 2000-09-01 02:47:25 +0000 | [diff] [blame] | 479 | if (PyErr_Occurred()) { |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 480 | if (gc_str == NULL) { |
| 481 | gc_str = PyString_FromString("garbage collection"); |
| 482 | } |
Jeremy Hylton | b709df3 | 2000-09-01 02:47:25 +0000 | [diff] [blame] | 483 | PyErr_WriteUnraisable(gc_str); |
| 484 | Py_FatalError("unexpected exception during garbage collection"); |
| 485 | } |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 486 | return n+m; |
| 487 | } |
| 488 | |
| 489 | static long |
| 490 | collect_generations(void) |
| 491 | { |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 492 | int i; |
Vladimir Marangozov | b16714b | 2000-07-10 05:37:39 +0000 | [diff] [blame] | 493 | long n = 0; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 494 | |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 495 | /* Find the oldest generation (higest numbered) where the count |
| 496 | * exceeds the threshold. Objects in the that generation and |
| 497 | * generations younger than it will be collected. */ |
| 498 | for (i = NUM_GENERATIONS-1; i >= 0; i--) { |
| 499 | if (generations[i].count > generations[i].threshold) { |
| 500 | n = collect(i); |
| 501 | break; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 502 | } |
| 503 | } |
| 504 | return n; |
| 505 | } |
| 506 | |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 507 | static char gc_enable__doc__[] = |
| 508 | "enable() -> None\n" |
| 509 | "\n" |
| 510 | "Enable automatic garbage collection.\n" |
| 511 | ; |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 512 | |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 513 | static PyObject * |
| 514 | gc_enable(PyObject *self, PyObject *args) |
| 515 | { |
| 516 | |
| 517 | if (!PyArg_ParseTuple(args, ":enable")) /* check no args */ |
| 518 | return NULL; |
| 519 | |
| 520 | enabled = 1; |
| 521 | |
| 522 | Py_INCREF(Py_None); |
| 523 | return Py_None; |
| 524 | } |
| 525 | |
| 526 | static char gc_disable__doc__[] = |
| 527 | "disable() -> None\n" |
| 528 | "\n" |
| 529 | "Disable automatic garbage collection.\n" |
| 530 | ; |
| 531 | |
| 532 | static PyObject * |
| 533 | gc_disable(PyObject *self, PyObject *args) |
| 534 | { |
| 535 | |
| 536 | if (!PyArg_ParseTuple(args, ":disable")) /* check no args */ |
| 537 | return NULL; |
| 538 | |
| 539 | enabled = 0; |
| 540 | |
| 541 | Py_INCREF(Py_None); |
| 542 | return Py_None; |
| 543 | } |
| 544 | |
| 545 | static char gc_isenabled__doc__[] = |
| 546 | "isenabled() -> status\n" |
| 547 | "\n" |
| 548 | "Returns true if automatic garbage collection is enabled.\n" |
| 549 | ; |
| 550 | |
| 551 | static PyObject * |
| 552 | gc_isenabled(PyObject *self, PyObject *args) |
| 553 | { |
| 554 | |
| 555 | if (!PyArg_ParseTuple(args, ":isenabled")) /* check no args */ |
| 556 | return NULL; |
| 557 | |
| 558 | return Py_BuildValue("i", enabled); |
| 559 | } |
| 560 | |
| 561 | static char gc_collect__doc__[] = |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 562 | "collect() -> n\n" |
| 563 | "\n" |
| 564 | "Run a full collection. The number of unreachable objects is returned.\n" |
| 565 | ; |
| 566 | |
| 567 | static PyObject * |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 568 | gc_collect(PyObject *self, PyObject *args) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 569 | { |
| 570 | long n; |
| 571 | |
Fred Drake | cc1be24 | 2000-07-12 04:42:23 +0000 | [diff] [blame] | 572 | if (!PyArg_ParseTuple(args, ":collect")) /* check no args */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 573 | return NULL; |
| 574 | |
Neil Schemenauer | e8c40cb | 2001-10-31 23:09:35 +0000 | [diff] [blame] | 575 | if (collecting) { |
| 576 | n = 0; /* already collecting, don't do anything */ |
| 577 | } |
| 578 | else { |
| 579 | collecting = 1; |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 580 | n = collect(NUM_GENERATIONS - 1); |
Neil Schemenauer | e8c40cb | 2001-10-31 23:09:35 +0000 | [diff] [blame] | 581 | collecting = 0; |
| 582 | } |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 583 | |
Neil Schemenauer | 7760cff | 2000-09-22 22:35:36 +0000 | [diff] [blame] | 584 | return Py_BuildValue("l", n); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 585 | } |
| 586 | |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 587 | static char gc_set_debug__doc__[] = |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 588 | "set_debug(flags) -> None\n" |
| 589 | "\n" |
| 590 | "Set the garbage collection debugging flags. Debugging information is\n" |
| 591 | "written to sys.stderr.\n" |
| 592 | "\n" |
| 593 | "flags is an integer and can have the following bits turned on:\n" |
| 594 | "\n" |
| 595 | " DEBUG_STATS - Print statistics during collection.\n" |
| 596 | " DEBUG_COLLECTABLE - Print collectable objects found.\n" |
| 597 | " DEBUG_UNCOLLECTABLE - Print unreachable but uncollectable objects found.\n" |
| 598 | " DEBUG_INSTANCES - Print instance objects.\n" |
| 599 | " DEBUG_OBJECTS - Print objects other than instances.\n" |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 600 | " DEBUG_SAVEALL - Save objects to gc.garbage rather than freeing them.\n" |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 601 | " DEBUG_LEAK - Debug leaking programs (everything but STATS).\n" |
| 602 | ; |
| 603 | |
| 604 | static PyObject * |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 605 | gc_set_debug(PyObject *self, PyObject *args) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 606 | { |
Neil Schemenauer | 7760cff | 2000-09-22 22:35:36 +0000 | [diff] [blame] | 607 | if (!PyArg_ParseTuple(args, "i:set_debug", &debug)) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 608 | return NULL; |
| 609 | |
| 610 | Py_INCREF(Py_None); |
| 611 | return Py_None; |
| 612 | } |
| 613 | |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 614 | static char gc_get_debug__doc__[] = |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 615 | "get_debug() -> flags\n" |
| 616 | "\n" |
| 617 | "Get the garbage collection debugging flags.\n" |
| 618 | ; |
| 619 | |
| 620 | static PyObject * |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 621 | gc_get_debug(PyObject *self, PyObject *args) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 622 | { |
Fred Drake | cc1be24 | 2000-07-12 04:42:23 +0000 | [diff] [blame] | 623 | if (!PyArg_ParseTuple(args, ":get_debug")) /* no args */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 624 | return NULL; |
| 625 | |
| 626 | return Py_BuildValue("i", debug); |
| 627 | } |
| 628 | |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 629 | static char gc_set_thresh__doc__[] = |
Neal Norwitz | 2a47c0f | 2002-01-29 00:53:41 +0000 | [diff] [blame] | 630 | "set_threshold(threshold0, [threshold1, threshold2]) -> None\n" |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 631 | "\n" |
| 632 | "Sets the collection thresholds. Setting threshold0 to zero disables\n" |
| 633 | "collection.\n" |
| 634 | ; |
| 635 | |
| 636 | static PyObject * |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 637 | gc_set_thresh(PyObject *self, PyObject *args) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 638 | { |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 639 | int i; |
| 640 | if (!PyArg_ParseTuple(args, "i|ii:set_threshold", |
| 641 | &generations[0].threshold, |
| 642 | &generations[1].threshold, |
| 643 | &generations[2].threshold)) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 644 | return NULL; |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 645 | for (i = 2; i < NUM_GENERATIONS; i++) { |
| 646 | /* generations higher than 2 get the same threshold */ |
| 647 | generations[i].threshold = generations[2].threshold; |
| 648 | } |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 649 | |
| 650 | Py_INCREF(Py_None); |
| 651 | return Py_None; |
| 652 | } |
| 653 | |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 654 | static char gc_get_thresh__doc__[] = |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 655 | "get_threshold() -> (threshold0, threshold1, threshold2)\n" |
| 656 | "\n" |
| 657 | "Return the current collection thresholds\n" |
| 658 | ; |
| 659 | |
| 660 | static PyObject * |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 661 | gc_get_thresh(PyObject *self, PyObject *args) |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 662 | { |
Fred Drake | cc1be24 | 2000-07-12 04:42:23 +0000 | [diff] [blame] | 663 | if (!PyArg_ParseTuple(args, ":get_threshold")) /* no args */ |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 664 | return NULL; |
| 665 | |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 666 | return Py_BuildValue("(iii)", |
| 667 | generations[0].threshold, |
| 668 | generations[1].threshold, |
| 669 | generations[2].threshold); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 670 | } |
| 671 | |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 672 | static int |
Martin v. Löwis | 560da62 | 2001-11-24 09:24:51 +0000 | [diff] [blame] | 673 | referrersvisit(PyObject* obj, PyObject *objs) |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 674 | { |
Martin v. Löwis | c8fe77b | 2001-11-29 18:08:31 +0000 | [diff] [blame] | 675 | int i; |
| 676 | for (i = 0; i < PyTuple_GET_SIZE(objs); i++) |
| 677 | if (PyTuple_GET_ITEM(objs, i) == obj) |
| 678 | return 1; |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 679 | return 0; |
| 680 | } |
| 681 | |
Neil Schemenauer | 17e7be6 | 2001-08-10 14:46:47 +0000 | [diff] [blame] | 682 | static int |
Martin v. Löwis | 560da62 | 2001-11-24 09:24:51 +0000 | [diff] [blame] | 683 | gc_referrers_for(PyObject *objs, PyGC_Head *list, PyObject *resultlist) |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 684 | { |
| 685 | PyGC_Head *gc; |
| 686 | PyObject *obj; |
| 687 | traverseproc traverse; |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 688 | for (gc = list->gc.gc_next; gc != list; gc = gc->gc.gc_next) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 689 | obj = FROM_GC(gc); |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 690 | traverse = obj->ob_type->tp_traverse; |
| 691 | if (obj == objs || obj == resultlist) |
| 692 | continue; |
Martin v. Löwis | 560da62 | 2001-11-24 09:24:51 +0000 | [diff] [blame] | 693 | if (traverse(obj, (visitproc)referrersvisit, objs)) { |
Neil Schemenauer | 17e7be6 | 2001-08-10 14:46:47 +0000 | [diff] [blame] | 694 | if (PyList_Append(resultlist, obj) < 0) |
| 695 | return 0; /* error */ |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 696 | } |
| 697 | } |
Neil Schemenauer | 17e7be6 | 2001-08-10 14:46:47 +0000 | [diff] [blame] | 698 | return 1; /* no error */ |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 699 | } |
| 700 | |
Martin v. Löwis | 560da62 | 2001-11-24 09:24:51 +0000 | [diff] [blame] | 701 | static char gc_get_referrers__doc__[]= |
| 702 | "get_referrers(*objs) -> list\n\ |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 703 | Return the list of objects that directly refer to any of objs."; |
| 704 | |
Neil Schemenauer | 17e7be6 | 2001-08-10 14:46:47 +0000 | [diff] [blame] | 705 | static PyObject * |
Martin v. Löwis | 560da62 | 2001-11-24 09:24:51 +0000 | [diff] [blame] | 706 | gc_get_referrers(PyObject *self, PyObject *args) |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 707 | { |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 708 | int i; |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 709 | PyObject *result = PyList_New(0); |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 710 | for (i = 0; i < NUM_GENERATIONS; i++) { |
| 711 | if (!(gc_referrers_for(args, GEN_HEAD(i), result))) { |
| 712 | Py_DECREF(result); |
| 713 | return NULL; |
| 714 | } |
Neil Schemenauer | 17e7be6 | 2001-08-10 14:46:47 +0000 | [diff] [blame] | 715 | } |
Neil Schemenauer | 48c7034 | 2001-08-09 15:38:31 +0000 | [diff] [blame] | 716 | return result; |
| 717 | } |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 718 | |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 719 | static char gc_get_objects__doc__[] = |
| 720 | "get_objects() -> [...]\n" |
| 721 | "\n" |
| 722 | "Return a list of objects tracked by the collector (excluding the list\n" |
| 723 | "returned).\n" |
| 724 | ; |
| 725 | |
| 726 | /* appending objects in a GC list to a Python list */ |
Martin v. Löwis | 155aad1 | 2001-12-02 12:21:34 +0000 | [diff] [blame] | 727 | static int |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 728 | append_objects(PyObject *py_list, PyGC_Head *gc_list) |
| 729 | { |
| 730 | PyGC_Head *gc; |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 731 | for (gc = gc_list->gc.gc_next; gc != gc_list; gc = gc->gc.gc_next) { |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 732 | PyObject *op = FROM_GC(gc); |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 733 | if (op != py_list) { |
Martin v. Löwis | 155aad1 | 2001-12-02 12:21:34 +0000 | [diff] [blame] | 734 | if (PyList_Append(py_list, op)) { |
| 735 | return -1; /* exception */ |
| 736 | } |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 737 | } |
| 738 | } |
Martin v. Löwis | 155aad1 | 2001-12-02 12:21:34 +0000 | [diff] [blame] | 739 | return 0; |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 740 | } |
| 741 | |
| 742 | static PyObject * |
| 743 | gc_get_objects(PyObject *self, PyObject *args) |
| 744 | { |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 745 | int i; |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 746 | PyObject* result; |
| 747 | |
| 748 | if (!PyArg_ParseTuple(args, ":get_objects")) /* check no args */ |
| 749 | return NULL; |
| 750 | result = PyList_New(0); |
Martin v. Löwis | f8a6f24 | 2001-12-02 18:31:02 +0000 | [diff] [blame] | 751 | if (result == NULL) { |
| 752 | return NULL; |
| 753 | } |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 754 | for (i = 0; i < NUM_GENERATIONS; i++) { |
| 755 | if (append_objects(result, GEN_HEAD(i))) { |
| 756 | Py_DECREF(result); |
| 757 | return NULL; |
| 758 | } |
Martin v. Löwis | 155aad1 | 2001-12-02 12:21:34 +0000 | [diff] [blame] | 759 | } |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 760 | return result; |
| 761 | } |
| 762 | |
| 763 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 764 | static char gc__doc__ [] = |
| 765 | "This module provides access to the garbage collector for reference cycles.\n" |
| 766 | "\n" |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 767 | "enable() -- Enable automatic garbage collection.\n" |
| 768 | "disable() -- Disable automatic garbage collection.\n" |
| 769 | "isenabled() -- Returns true if automatic collection is enabled.\n" |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 770 | "collect() -- Do a full collection right now.\n" |
| 771 | "set_debug() -- Set debugging flags.\n" |
| 772 | "get_debug() -- Get debugging flags.\n" |
| 773 | "set_threshold() -- Set the collection thresholds.\n" |
| 774 | "get_threshold() -- Return the current the collection thresholds.\n" |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 775 | "get_objects() -- Return a list of all objects tracked by the collector.\n" |
Martin v. Löwis | 560da62 | 2001-11-24 09:24:51 +0000 | [diff] [blame] | 776 | "get_referrers() -- Return the list of objects that refer to an object.\n" |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 777 | ; |
| 778 | |
| 779 | static PyMethodDef GcMethods[] = { |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 780 | {"enable", gc_enable, METH_VARARGS, gc_enable__doc__}, |
| 781 | {"disable", gc_disable, METH_VARARGS, gc_disable__doc__}, |
Vladimir Marangozov | f9d20c3 | 2000-08-06 22:45:31 +0000 | [diff] [blame] | 782 | {"isenabled", gc_isenabled, METH_VARARGS, gc_isenabled__doc__}, |
| 783 | {"set_debug", gc_set_debug, METH_VARARGS, gc_set_debug__doc__}, |
| 784 | {"get_debug", gc_get_debug, METH_VARARGS, gc_get_debug__doc__}, |
| 785 | {"set_threshold", gc_set_thresh, METH_VARARGS, gc_set_thresh__doc__}, |
| 786 | {"get_threshold", gc_get_thresh, METH_VARARGS, gc_get_thresh__doc__}, |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 787 | {"collect", gc_collect, METH_VARARGS, gc_collect__doc__}, |
Neil Schemenauer | c7c8d8e | 2001-08-09 15:58:59 +0000 | [diff] [blame] | 788 | {"get_objects", gc_get_objects,METH_VARARGS, gc_get_objects__doc__}, |
Martin v. Löwis | 560da62 | 2001-11-24 09:24:51 +0000 | [diff] [blame] | 789 | {"get_referrers", gc_get_referrers, METH_VARARGS, |
| 790 | gc_get_referrers__doc__}, |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 791 | {NULL, NULL} /* Sentinel */ |
| 792 | }; |
| 793 | |
| 794 | void |
| 795 | initgc(void) |
| 796 | { |
| 797 | PyObject *m; |
| 798 | PyObject *d; |
| 799 | |
| 800 | m = Py_InitModule4("gc", |
| 801 | GcMethods, |
| 802 | gc__doc__, |
| 803 | NULL, |
| 804 | PYTHON_API_VERSION); |
| 805 | d = PyModule_GetDict(m); |
| 806 | if (garbage == NULL) { |
| 807 | garbage = PyList_New(0); |
| 808 | } |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 809 | PyDict_SetItemString(d, "garbage", garbage); |
| 810 | PyDict_SetItemString(d, "DEBUG_STATS", |
| 811 | PyInt_FromLong(DEBUG_STATS)); |
| 812 | PyDict_SetItemString(d, "DEBUG_COLLECTABLE", |
| 813 | PyInt_FromLong(DEBUG_COLLECTABLE)); |
| 814 | PyDict_SetItemString(d, "DEBUG_UNCOLLECTABLE", |
| 815 | PyInt_FromLong(DEBUG_UNCOLLECTABLE)); |
| 816 | PyDict_SetItemString(d, "DEBUG_INSTANCES", |
| 817 | PyInt_FromLong(DEBUG_INSTANCES)); |
| 818 | PyDict_SetItemString(d, "DEBUG_OBJECTS", |
| 819 | PyInt_FromLong(DEBUG_OBJECTS)); |
Neil Schemenauer | 544de1e | 2000-09-22 15:22:38 +0000 | [diff] [blame] | 820 | PyDict_SetItemString(d, "DEBUG_SAVEALL", |
| 821 | PyInt_FromLong(DEBUG_SAVEALL)); |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 822 | PyDict_SetItemString(d, "DEBUG_LEAK", |
| 823 | PyInt_FromLong(DEBUG_LEAK)); |
| 824 | } |
| 825 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 826 | /* for debugging */ |
| 827 | void _PyGC_Dump(PyGC_Head *g) |
| 828 | { |
| 829 | _PyObject_Dump(FROM_GC(g)); |
| 830 | } |
| 831 | |
Jeremy Hylton | c5007aa | 2000-06-30 05:02:53 +0000 | [diff] [blame] | 832 | #endif /* WITH_CYCLE_GC */ |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 833 | |
| 834 | /* extension modules might be compiled with GC support so these |
| 835 | functions must always be available */ |
| 836 | |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 837 | #undef PyObject_GC_Track |
| 838 | #undef PyObject_GC_UnTrack |
| 839 | #undef PyObject_GC_Del |
| 840 | #undef _PyObject_GC_Malloc |
| 841 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 842 | void |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 843 | PyObject_GC_Track(void *op) |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 844 | { |
| 845 | _PyObject_GC_TRACK(op); |
| 846 | } |
| 847 | |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 848 | /* for binary compatibility with 2.2 */ |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 849 | void |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 850 | _PyObject_GC_Track(PyObject *op) |
| 851 | { |
| 852 | PyObject_GC_Track(op); |
| 853 | } |
| 854 | |
| 855 | void |
| 856 | PyObject_GC_UnTrack(void *op) |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 857 | { |
Neil Schemenauer | b883310 | 2002-03-29 03:04:25 +0000 | [diff] [blame] | 858 | #ifdef WITH_CYCLE_GC |
Guido van Rossum | ff413af | 2002-03-28 20:34:59 +0000 | [diff] [blame] | 859 | PyGC_Head *gc = AS_GC(op); |
| 860 | if (gc->gc.gc_next != NULL) |
| 861 | _PyObject_GC_UNTRACK(op); |
Neil Schemenauer | b883310 | 2002-03-29 03:04:25 +0000 | [diff] [blame] | 862 | #endif |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 863 | } |
| 864 | |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 865 | /* for binary compatibility with 2.2 */ |
| 866 | void |
| 867 | _PyObject_GC_UnTrack(PyObject *op) |
| 868 | { |
| 869 | PyObject_GC_UnTrack(op); |
| 870 | } |
| 871 | |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 872 | PyObject * |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 873 | _PyObject_GC_Malloc(size_t basicsize) |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 874 | { |
| 875 | PyObject *op; |
| 876 | #ifdef WITH_CYCLE_GC |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 877 | PyGC_Head *g = PyObject_MALLOC(sizeof(PyGC_Head) + basicsize); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 878 | if (g == NULL) |
| 879 | return (PyObject *)PyErr_NoMemory(); |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 880 | g->gc.gc_next = NULL; |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 881 | generations[0].count++; /* number of allocated GC objects */ |
| 882 | if (generations[0].count > generations[0].threshold && |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 883 | enabled && |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 884 | generations[0].threshold && |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 885 | !collecting && |
| 886 | !PyErr_Occurred()) { |
| 887 | collecting = 1; |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 888 | collect_generations(); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 889 | collecting = 0; |
| 890 | } |
| 891 | op = FROM_GC(g); |
| 892 | #else |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 893 | op = PyObject_MALLOC(basicsize); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 894 | if (op == NULL) |
| 895 | return (PyObject *)PyErr_NoMemory(); |
| 896 | |
| 897 | #endif |
| 898 | return op; |
| 899 | } |
| 900 | |
| 901 | PyObject * |
| 902 | _PyObject_GC_New(PyTypeObject *tp) |
| 903 | { |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 904 | PyObject *op = _PyObject_GC_Malloc(_PyObject_SIZE(tp)); |
Tim Peters | fa8efab | 2002-04-28 01:57:25 +0000 | [diff] [blame] | 905 | if (op != NULL) |
| 906 | op = PyObject_INIT(op, tp); |
| 907 | return op; |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 908 | } |
| 909 | |
| 910 | PyVarObject * |
Tim Peters | 6d483d3 | 2001-10-06 21:27:34 +0000 | [diff] [blame] | 911 | _PyObject_GC_NewVar(PyTypeObject *tp, int nitems) |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 912 | { |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 913 | const size_t size = _PyObject_VAR_SIZE(tp, nitems); |
| 914 | PyVarObject *op = (PyVarObject *) _PyObject_GC_Malloc(size); |
Tim Peters | fa8efab | 2002-04-28 01:57:25 +0000 | [diff] [blame] | 915 | if (op != NULL) |
| 916 | op = PyObject_INIT_VAR(op, tp, nitems); |
| 917 | return op; |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | PyVarObject * |
Tim Peters | 6d483d3 | 2001-10-06 21:27:34 +0000 | [diff] [blame] | 921 | _PyObject_GC_Resize(PyVarObject *op, int nitems) |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 922 | { |
Tim Peters | f2a67da | 2001-10-07 03:54:51 +0000 | [diff] [blame] | 923 | const size_t basicsize = _PyObject_VAR_SIZE(op->ob_type, nitems); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 924 | #ifdef WITH_CYCLE_GC |
| 925 | PyGC_Head *g = AS_GC(op); |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 926 | g = PyObject_REALLOC(g, sizeof(PyGC_Head) + basicsize); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 927 | if (g == NULL) |
| 928 | return (PyVarObject *)PyErr_NoMemory(); |
| 929 | op = (PyVarObject *) FROM_GC(g); |
| 930 | #else |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 931 | op = PyObject_REALLOC(op, basicsize); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 932 | if (op == NULL) |
| 933 | return (PyVarObject *)PyErr_NoMemory(); |
| 934 | #endif |
Tim Peters | 6d483d3 | 2001-10-06 21:27:34 +0000 | [diff] [blame] | 935 | op->ob_size = nitems; |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 936 | return op; |
| 937 | } |
| 938 | |
| 939 | void |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 940 | PyObject_GC_Del(void *op) |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 941 | { |
| 942 | #ifdef WITH_CYCLE_GC |
| 943 | PyGC_Head *g = AS_GC(op); |
Tim Peters | 9e4ca10 | 2001-10-11 18:31:31 +0000 | [diff] [blame] | 944 | if (g->gc.gc_next != NULL) |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 945 | gc_list_remove(g); |
Neil Schemenauer | 2880ae5 | 2002-05-04 05:35:20 +0000 | [diff] [blame^] | 946 | if (generations[0].count > 0) { |
| 947 | generations[0].count--; |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 948 | } |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 949 | PyObject_FREE(g); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 950 | #else |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 951 | PyObject_FREE(op); |
Neil Schemenauer | 43411b5 | 2001-08-30 00:05:51 +0000 | [diff] [blame] | 952 | #endif |
| 953 | } |
| 954 | |
Neil Schemenauer | fec4eb1 | 2002-04-12 02:41:03 +0000 | [diff] [blame] | 955 | /* for binary compatibility with 2.2 */ |
| 956 | #undef _PyObject_GC_Del |
| 957 | void |
| 958 | _PyObject_GC_Del(PyObject *op) |
| 959 | { |
| 960 | PyObject_GC_Del(op); |
| 961 | } |