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35e459c3eb
debug_cycle(), and don't cast the pointer to a long. Neither needs the literal `0x' prefix as %p automatically inserts this (on Linux at least).
667 lines
17 KiB
C
667 lines
17 KiB
C
/*
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Reference Cycle Garbage Collection
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==================================
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Neil Schemenauer <nascheme@enme.ucalgary.ca>
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Based on a post on the python-dev list. Ideas from Guido van Rossum,
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Eric Tiedemann, and various others.
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http://www.enme.calgary.ca/~nascheme/python/gc.html
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http://www.python.org/pipermail/python-dev/2000-March/003869.html
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http://www.python.org/pipermail/python-dev/2000-March/004010.html
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http://www.python.org/pipermail/python-dev/2000-March/004022.html
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For a highlevel view of the collection process, read the collect
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function.
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TODO:
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use a different interface for set_debug() (keywords)?
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tune parameters
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*/
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#include "Python.h"
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#ifdef WITH_CYCLE_GC
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/* magic gc_refs value */
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#define GC_MOVED -1
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/*** Global GC state ***/
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/* linked lists of container objects */
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static PyGC_Head generation0 = {&generation0, &generation0, 0};
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static PyGC_Head generation1 = {&generation1, &generation1, 0};
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static PyGC_Head generation2 = {&generation2, &generation2, 0};
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static int generation = 0; /* current generation being collected */
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/* collection frequencies, XXX tune these */
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static int threshold0 = 100; /* net new containers before collection */
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static int threshold1 = 10; /* generation0 collections before collecting 1 */
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static int threshold2 = 10; /* generation1 collections before collecting 2 */
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/* net new objects allocated since last collection */
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static int allocated;
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/* set for debugging information */
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#define DEBUG_STATS (1<<0) /* print collection statistics */
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#define DEBUG_COLLECTABLE (1<<1) /* print collectable objects */
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#define DEBUG_UNCOLLECTABLE (1<<2) /* print uncollectable objects */
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#define DEBUG_INSTANCES (1<<3) /* print instances */
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#define DEBUG_OBJECTS (1<<4) /* print other objects */
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#define DEBUG_LEAK DEBUG_COLLECTABLE | \
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DEBUG_UNCOLLECTABLE | \
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DEBUG_INSTANCES | \
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DEBUG_OBJECTS
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static int debug;
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/* list of uncollectable objects */
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static PyObject *garbage;
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/*** list functions ***/
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static void
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gc_list_init(PyGC_Head *list)
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{
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list->gc_prev = list;
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list->gc_next = list;
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}
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static void
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gc_list_append(PyGC_Head *node, PyGC_Head *list)
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{
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node->gc_next = list;
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node->gc_prev = list->gc_prev;
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node->gc_prev->gc_next = node;
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list->gc_prev = node;
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}
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static void
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gc_list_remove(PyGC_Head *node)
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{
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node->gc_prev->gc_next = node->gc_next;
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node->gc_next->gc_prev = node->gc_prev;
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#ifdef Py_DEBUG
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node->gc_prev = NULL;
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node->gc_next = NULL;
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#endif
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}
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static void
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gc_list_move(PyGC_Head *from, PyGC_Head *to)
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{
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if (from->gc_next == from) {
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/* empty from list */
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gc_list_init(to);
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} else {
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to->gc_next = from->gc_next;
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to->gc_next->gc_prev = to;
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to->gc_prev = from->gc_prev;
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to->gc_prev->gc_next = to;
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}
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gc_list_init(from);
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}
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/* append a list onto another list, from becomes an empty list */
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static void
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gc_list_merge(PyGC_Head *from, PyGC_Head *to)
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{
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PyGC_Head *tail;
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if (from->gc_next != from) {
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tail = to->gc_prev;
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tail->gc_next = from->gc_next;
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tail->gc_next->gc_prev = tail;
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to->gc_prev = from->gc_prev;
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to->gc_prev->gc_next = to;
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}
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gc_list_init(from);
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}
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static long
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gc_list_size(PyGC_Head *list)
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{
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PyGC_Head *gc;
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long n = 0;
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for (gc = list->gc_next; gc != list; gc = gc->gc_next) {
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n++;
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}
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return n;
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}
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/*** end of list stuff ***/
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/* Set all gc_refs = ob_refcnt */
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static void
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update_refs(PyGC_Head *containers)
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{
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PyGC_Head *gc = containers->gc_next;
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for (; gc != containers; gc=gc->gc_next) {
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gc->gc_refs = PyObject_FROM_GC(gc)->ob_refcnt;
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}
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}
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static int
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visit_decref(PyObject *op, void *data)
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{
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if (op && PyObject_IS_GC(op)) {
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PyObject_AS_GC(op)->gc_refs--;
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}
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return 0;
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}
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/* Subtract internal references from gc_refs */
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static void
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subtract_refs(PyGC_Head *containers)
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{
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traverseproc traverse;
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PyGC_Head *gc = containers->gc_next;
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for (; gc != containers; gc=gc->gc_next) {
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traverse = PyObject_FROM_GC(gc)->ob_type->tp_traverse;
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(void) traverse(PyObject_FROM_GC(gc),
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(visitproc)visit_decref,
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NULL);
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}
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}
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/* Append objects with gc_refs > 0 to roots list */
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static void
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move_roots(PyGC_Head *containers, PyGC_Head *roots)
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{
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PyGC_Head *next;
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PyGC_Head *gc = containers->gc_next;
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while (gc != containers) {
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next = gc->gc_next;
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if (gc->gc_refs > 0) {
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gc_list_remove(gc);
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gc_list_append(gc, roots);
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gc->gc_refs = GC_MOVED;
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}
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gc = next;
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}
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}
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static int
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visit_reachable(PyObject *op, PyGC_Head *roots)
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{
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if (PyObject_IS_GC(op)) {
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PyGC_Head *gc = PyObject_AS_GC(op);
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if (gc && gc->gc_refs != GC_MOVED) {
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gc_list_remove(gc);
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gc_list_append(gc, roots);
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gc->gc_refs = GC_MOVED;
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}
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}
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return 0;
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}
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/* Move objects referenced from reachable to reachable set. */
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static void
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move_root_reachable(PyGC_Head *reachable)
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{
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traverseproc traverse;
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PyGC_Head *gc = reachable->gc_next;
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for (; gc != reachable; gc=gc->gc_next) {
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/* careful, reachable list is growing here */
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PyObject *op = PyObject_FROM_GC(gc);
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traverse = op->ob_type->tp_traverse;
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(void) traverse(op,
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(visitproc)visit_reachable,
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(void *)reachable);
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}
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}
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/* move all objects with finalizers (instances with __del__) */
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static void
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move_finalizers(PyGC_Head *unreachable, PyGC_Head *finalizers)
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{
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PyGC_Head *next;
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PyGC_Head *gc = unreachable->gc_next;
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static PyObject *delstr;
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if (delstr == NULL) {
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delstr = PyString_InternFromString("__del__");
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}
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for (; gc != unreachable; gc=next) {
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PyObject *op = PyObject_FROM_GC(gc);
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next = gc->gc_next;
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if (PyInstance_Check(op) && PyObject_HasAttr(op, delstr)) {
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gc_list_remove(gc);
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gc_list_append(gc, finalizers);
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}
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}
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}
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/* called by tp_traverse */
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static int
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visit_finalizer_reachable(PyObject *op, PyGC_Head *finalizers)
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{
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if (PyObject_IS_GC(op)) {
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PyGC_Head *gc = PyObject_AS_GC(op);
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if (gc && gc->gc_refs != GC_MOVED) {
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gc_list_remove(gc);
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gc_list_append(gc, finalizers);
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gc->gc_refs = GC_MOVED;
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}
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}
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return 0;
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}
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/* Move objects referenced from roots to roots */
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static void
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move_finalizer_reachable(PyGC_Head *finalizers)
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{
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traverseproc traverse;
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PyGC_Head *gc = finalizers->gc_next;
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for (; gc != finalizers; gc=gc->gc_next) {
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/* careful, finalizers list is growing here */
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traverse = PyObject_FROM_GC(gc)->ob_type->tp_traverse;
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(void) traverse(PyObject_FROM_GC(gc),
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(visitproc)visit_finalizer_reachable,
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(void *)finalizers);
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}
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}
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static void
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debug_instance(PyObject *output, char *msg, PyInstanceObject *inst)
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{
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char buf[200];
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char *cname;
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/* be careful not to create new dictionaries */
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PyObject *classname = inst->in_class->cl_name;
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if (classname != NULL && PyString_Check(classname))
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cname = PyString_AsString(classname);
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else
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cname = "?";
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sprintf(buf, "gc: %s<%.100s instance at %p>\n", msg, cname, inst);
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PyFile_WriteString(buf, output);
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}
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static void
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debug_cycle(PyObject *output, char *msg, PyObject *op)
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{
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if ((debug & DEBUG_INSTANCES) && PyInstance_Check(op)) {
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debug_instance(output, msg, (PyInstanceObject *)op);
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} else if (debug & DEBUG_OBJECTS) {
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char buf[200];
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sprintf(buf, "gc: %s<%.100s %p>\n", msg,
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op->ob_type->tp_name, op);
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PyFile_WriteString(buf, output);
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}
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}
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/* Handle uncollectable garbage (cycles with finalizers). */
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static void
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handle_finalizers(PyGC_Head *finalizers, PyGC_Head *old)
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{
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PyGC_Head *gc;
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if (garbage == NULL) {
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garbage = PyList_New(0);
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}
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for (gc = finalizers->gc_next; gc != finalizers;
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gc = finalizers->gc_next) {
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PyObject *op = PyObject_FROM_GC(gc);
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/* Add all instances to a Python accessible list of garbage */
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if (PyInstance_Check(op)) {
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PyList_Append(garbage, op);
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}
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/* We assume that all objects in finalizers are reachable from
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* instances. Once we add the instances to the garbage list
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* everything is reachable from Python again. */
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gc_list_remove(gc);
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gc_list_append(gc, old);
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}
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}
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/* Break reference cycles by clearing the containers involved. This is
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* tricky business as the lists can be changing and we don't know which
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* objects may be freed. It is possible I screwed something up here. */
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static void
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delete_garbage(PyGC_Head *unreachable, PyGC_Head *old)
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{
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inquiry clear;
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while (unreachable->gc_next != unreachable) {
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PyGC_Head *gc = unreachable->gc_next;
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PyObject *op = PyObject_FROM_GC(gc);
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/*
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PyList_Append(garbage, op);
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*/
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if ((clear = op->ob_type->tp_clear) != NULL) {
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Py_INCREF(op);
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clear((PyObject *)op);
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Py_DECREF(op);
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}
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/* only try to call tp_clear once for each object */
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if (unreachable->gc_next == gc) {
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/* still alive, move it, it may die later */
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gc_list_remove(gc);
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gc_list_append(gc, old);
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}
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}
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}
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/* This is the main function. Read this to understand how the
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* collection process works. */
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static long
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collect(PyGC_Head *young, PyGC_Head *old)
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{
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long n = 0;
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long m = 0;
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PyGC_Head reachable;
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PyGC_Head unreachable;
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PyGC_Head finalizers;
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PyGC_Head *gc;
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PyObject *output = NULL;
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if (debug) {
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output = PySys_GetObject("stderr");
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}
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if (debug & DEBUG_STATS) {
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char buf[100];
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sprintf(buf, "gc: collecting generation %d...\n", generation);
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PyFile_WriteString(buf,output);
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sprintf(buf, "gc: objects in each generation: %ld %ld %ld\n",
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gc_list_size(&generation0),
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gc_list_size(&generation1),
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gc_list_size(&generation2));
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PyFile_WriteString(buf,output);
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}
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/* Using ob_refcnt and gc_refs, calculate which objects in the
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* container set are reachable from outside the set (ie. have a
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* refcount greater than 0 when all the references within the
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* set are taken into account */
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update_refs(young);
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subtract_refs(young);
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/* Move everything reachable from outside the set into the
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* reachable set (ie. gc_refs > 0). Next, move everything
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* reachable from objects in the reachable set. */
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gc_list_init(&reachable);
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move_roots(young, &reachable);
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move_root_reachable(&reachable);
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/* move unreachable objects to a temporary list, new objects can be
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* allocated after this point */
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gc_list_init(&unreachable);
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gc_list_move(young, &unreachable);
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/* move reachable objects to next generation */
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gc_list_merge(&reachable, old);
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/* Move objects reachable from finalizers, we can't safely delete
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* them. Python programmers should take care not to create such
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* things. For Python finalizers means instance objects with
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* __del__ methods. */
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gc_list_init(&finalizers);
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move_finalizers(&unreachable, &finalizers);
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move_finalizer_reachable(&finalizers);
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/* Collect statistics on collectable objects found and print
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* debugging information. */
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for (gc = unreachable.gc_next; gc != &unreachable;
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gc = gc->gc_next) {
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m++;
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if (output != NULL && (debug & DEBUG_COLLECTABLE)) {
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debug_cycle(output, "collectable ", PyObject_FROM_GC(gc));
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}
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}
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/* call tp_clear on objects in the collectable set. This will cause
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* the reference cycles to be broken. It may also cause some objects in
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* finalizers to be freed */
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delete_garbage(&unreachable, old);
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/* Collect statistics on uncollectable objects found and print
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* debugging information. */
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for (gc = finalizers.gc_next; gc != &finalizers;
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gc = gc->gc_next) {
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n++;
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if (output != NULL && (debug & DEBUG_UNCOLLECTABLE)) {
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debug_cycle(output, "uncollectable ", PyObject_FROM_GC(gc));
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}
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}
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if (output != NULL && (debug & DEBUG_STATS)) {
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if (m == 0 && n == 0) {
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PyFile_WriteString("gc: done.\n", output);
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} else {
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char buf[200];
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sprintf(buf,
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"gc: done, %ld unreachable, %ld uncollectable.\n",
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n+m, n);
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PyFile_WriteString(buf, output);
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}
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}
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/* Append instances in the uncollectable set to a Python
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* reachable list of garbage. The programmer has to deal with
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* this if they insist on creating this type of structure. */
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handle_finalizers(&finalizers, old);
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allocated = 0;
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PyErr_Clear(); /* in case writing to sys.stderr failed */
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return n+m;
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}
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static long
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collect_generations(void)
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{
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static long collections0 = 0;
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static long collections1 = 0;
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long n = 0;
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if (collections1 > threshold2) {
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generation = 2;
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gc_list_merge(&generation0, &generation2);
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gc_list_merge(&generation1, &generation2);
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if (generation2.gc_next != &generation2) {
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n = collect(&generation2, &generation2);
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}
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collections1 = 0;
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} else if (collections0 > threshold1) {
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generation = 1;
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collections1++;
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gc_list_merge(&generation0, &generation1);
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if (generation1.gc_next != &generation1) {
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n = collect(&generation1, &generation2);
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}
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collections0 = 0;
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} else {
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generation = 0;
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collections0++;
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if (generation0.gc_next != &generation0) {
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n = collect(&generation0, &generation1);
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}
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}
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return n;
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}
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void
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_PyGC_Insert(PyObject *op)
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{
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/* collection lock since collecting may cause allocations */
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static int collecting = 0;
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#ifdef Py_DEBUG
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if (!PyObject_IS_GC(op)) {
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abort();
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}
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#endif
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if (threshold0 && allocated > threshold0 && !collecting) {
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collecting++;
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collect_generations();
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collecting--;
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}
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allocated++;
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gc_list_append(PyObject_AS_GC(op), &generation0);
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}
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void
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_PyGC_Remove(PyObject *op)
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{
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PyGC_Head *g = PyObject_AS_GC(op);
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#ifdef Py_DEBUG
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if (!PyObject_IS_GC(op)) {
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abort();
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}
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#endif
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gc_list_remove(g);
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if (allocated > 0) {
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allocated--;
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}
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}
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static char collect__doc__[] =
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"collect() -> n\n"
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"\n"
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"Run a full collection. The number of unreachable objects is returned.\n"
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;
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static PyObject *
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Py_collect(PyObject *self, PyObject *args)
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{
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long n;
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|
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if (!PyArg_ParseTuple(args, ":collect")) /* check no args */
|
|
return NULL;
|
|
|
|
generation = 2;
|
|
gc_list_merge(&generation0, &generation2);
|
|
gc_list_merge(&generation1, &generation2);
|
|
n = collect(&generation2, &generation2);
|
|
|
|
return Py_BuildValue("i", n);
|
|
}
|
|
|
|
static char set_debug__doc__[] =
|
|
"set_debug(flags) -> None\n"
|
|
"\n"
|
|
"Set the garbage collection debugging flags. Debugging information is\n"
|
|
"written to sys.stderr.\n"
|
|
"\n"
|
|
"flags is an integer and can have the following bits turned on:\n"
|
|
"\n"
|
|
" DEBUG_STATS - Print statistics during collection.\n"
|
|
" DEBUG_COLLECTABLE - Print collectable objects found.\n"
|
|
" DEBUG_UNCOLLECTABLE - Print unreachable but uncollectable objects found.\n"
|
|
" DEBUG_INSTANCES - Print instance objects.\n"
|
|
" DEBUG_OBJECTS - Print objects other than instances.\n"
|
|
" DEBUG_LEAK - Debug leaking programs (everything but STATS).\n"
|
|
;
|
|
|
|
static PyObject *
|
|
Py_set_debug(PyObject *self, PyObject *args)
|
|
{
|
|
if (!PyArg_ParseTuple(args, "l:get_debug", &debug))
|
|
return NULL;
|
|
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
|
|
static char get_debug__doc__[] =
|
|
"get_debug() -> flags\n"
|
|
"\n"
|
|
"Get the garbage collection debugging flags.\n"
|
|
;
|
|
|
|
static PyObject *
|
|
Py_get_debug(PyObject *self, PyObject *args)
|
|
{
|
|
if (!PyArg_ParseTuple(args, ":get_debug")) /* no args */
|
|
return NULL;
|
|
|
|
return Py_BuildValue("i", debug);
|
|
}
|
|
|
|
static char set_thresh__doc__[] =
|
|
"set_threshold(threshold0, [threhold1, threshold2]) -> None\n"
|
|
"\n"
|
|
"Sets the collection thresholds. Setting threshold0 to zero disables\n"
|
|
"collection.\n"
|
|
;
|
|
|
|
static PyObject *
|
|
Py_set_thresh(PyObject *self, PyObject *args)
|
|
{
|
|
if (!PyArg_ParseTuple(args, "i|ii:set_threshold", &threshold0,
|
|
&threshold1, &threshold2))
|
|
return NULL;
|
|
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
|
|
static char get_thresh__doc__[] =
|
|
"get_threshold() -> (threshold0, threshold1, threshold2)\n"
|
|
"\n"
|
|
"Return the current collection thresholds\n"
|
|
;
|
|
|
|
static PyObject *
|
|
Py_get_thresh(PyObject *self, PyObject *args)
|
|
{
|
|
if (!PyArg_ParseTuple(args, ":get_threshold")) /* no args */
|
|
return NULL;
|
|
|
|
return Py_BuildValue("(iii)", threshold0, threshold1, threshold2);
|
|
}
|
|
|
|
|
|
static char gc__doc__ [] =
|
|
"This module provides access to the garbage collector for reference cycles.\n"
|
|
"\n"
|
|
"collect() -- Do a full collection right now.\n"
|
|
"set_debug() -- Set debugging flags.\n"
|
|
"get_debug() -- Get debugging flags.\n"
|
|
"set_threshold() -- Set the collection thresholds.\n"
|
|
"get_threshold() -- Return the current the collection thresholds.\n"
|
|
;
|
|
|
|
static PyMethodDef GcMethods[] = {
|
|
{"set_debug", Py_set_debug, METH_VARARGS, set_debug__doc__},
|
|
{"get_debug", Py_get_debug, METH_VARARGS, get_debug__doc__},
|
|
{"set_threshold", Py_set_thresh, METH_VARARGS, set_thresh__doc__},
|
|
{"get_threshold", Py_get_thresh, METH_VARARGS, get_thresh__doc__},
|
|
{"collect", Py_collect, METH_VARARGS, collect__doc__},
|
|
{NULL, NULL} /* Sentinel */
|
|
};
|
|
|
|
void
|
|
initgc(void)
|
|
{
|
|
PyObject *m;
|
|
PyObject *d;
|
|
|
|
m = Py_InitModule4("gc",
|
|
GcMethods,
|
|
gc__doc__,
|
|
NULL,
|
|
PYTHON_API_VERSION);
|
|
d = PyModule_GetDict(m);
|
|
if (garbage == NULL) {
|
|
garbage = PyList_New(0);
|
|
}
|
|
PyDict_SetItemString(d, "garbage", garbage);
|
|
PyDict_SetItemString(d, "DEBUG_STATS",
|
|
PyInt_FromLong(DEBUG_STATS));
|
|
PyDict_SetItemString(d, "DEBUG_COLLECTABLE",
|
|
PyInt_FromLong(DEBUG_COLLECTABLE));
|
|
PyDict_SetItemString(d, "DEBUG_UNCOLLECTABLE",
|
|
PyInt_FromLong(DEBUG_UNCOLLECTABLE));
|
|
PyDict_SetItemString(d, "DEBUG_INSTANCES",
|
|
PyInt_FromLong(DEBUG_INSTANCES));
|
|
PyDict_SetItemString(d, "DEBUG_OBJECTS",
|
|
PyInt_FromLong(DEBUG_OBJECTS));
|
|
PyDict_SetItemString(d, "DEBUG_LEAK",
|
|
PyInt_FromLong(DEBUG_LEAK));
|
|
}
|
|
|
|
#endif /* WITH_CYCLE_GC */
|