cpython/Objects/object.c

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/* Generic object operations; and implementation of None */
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#include "Python.h"
#include "frameobject.h"
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#ifdef __cplusplus
extern "C" {
#endif
#ifdef Py_REF_DEBUG
Py_ssize_t _Py_RefTotal;
Py_ssize_t
_Py_GetRefTotal(void)
{
PyObject *o;
Py_ssize_t total = _Py_RefTotal;
/* ignore the references to the dummy object of the dicts and sets
because they are not reliable and not useful (now that the
hash table code is well-tested) */
o = _PyDict_Dummy();
if (o != NULL)
total -= o->ob_refcnt;
o = _PySet_Dummy();
if (o != NULL)
total -= o->ob_refcnt;
return total;
}
#endif /* Py_REF_DEBUG */
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/* Object allocation routines used by NEWOBJ and NEWVAROBJ macros.
These are used by the individual routines for object creation.
Do not call them otherwise, they do not initialize the object! */
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#ifdef Py_TRACE_REFS
/* Head of circular doubly-linked list of all objects. These are linked
* together via the _ob_prev and _ob_next members of a PyObject, which
* exist only in a Py_TRACE_REFS build.
*/
static PyObject refchain = {&refchain, &refchain};
/* Insert op at the front of the list of all objects. If force is true,
* op is added even if _ob_prev and _ob_next are non-NULL already. If
* force is false amd _ob_prev or _ob_next are non-NULL, do nothing.
* force should be true if and only if op points to freshly allocated,
* uninitialized memory, or you've unlinked op from the list and are
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* relinking it into the front.
* Note that objects are normally added to the list via _Py_NewReference,
* which is called by PyObject_Init. Not all objects are initialized that
* way, though; exceptions include statically allocated type objects, and
* statically allocated singletons (like Py_True and Py_None).
*/
void
_Py_AddToAllObjects(PyObject *op, int force)
{
#ifdef Py_DEBUG
if (!force) {
/* If it's initialized memory, op must be in or out of
* the list unambiguously.
*/
assert((op->_ob_prev == NULL) == (op->_ob_next == NULL));
}
#endif
if (force || op->_ob_prev == NULL) {
op->_ob_next = refchain._ob_next;
op->_ob_prev = &refchain;
refchain._ob_next->_ob_prev = op;
refchain._ob_next = op;
}
}
#endif /* Py_TRACE_REFS */
#ifdef COUNT_ALLOCS
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static PyTypeObject *type_list;
/* All types are added to type_list, at least when
they get one object created. That makes them
immortal, which unfortunately contributes to
garbage itself. If unlist_types_without_objects
is set, they will be removed from the type_list
once the last object is deallocated. */
static int unlist_types_without_objects;
extern Py_ssize_t tuple_zero_allocs, fast_tuple_allocs;
extern Py_ssize_t quick_int_allocs, quick_neg_int_allocs;
extern Py_ssize_t null_strings, one_strings;
void
dump_counts(FILE* f)
{
PyTypeObject *tp;
for (tp = type_list; tp; tp = tp->tp_next)
fprintf(f, "%s alloc'd: %" PY_FORMAT_SIZE_T "d, "
"freed: %" PY_FORMAT_SIZE_T "d, "
"max in use: %" PY_FORMAT_SIZE_T "d\n",
tp->tp_name, tp->tp_allocs, tp->tp_frees,
tp->tp_maxalloc);
fprintf(f, "fast tuple allocs: %" PY_FORMAT_SIZE_T "d, "
"empty: %" PY_FORMAT_SIZE_T "d\n",
fast_tuple_allocs, tuple_zero_allocs);
fprintf(f, "fast int allocs: pos: %" PY_FORMAT_SIZE_T "d, "
"neg: %" PY_FORMAT_SIZE_T "d\n",
quick_int_allocs, quick_neg_int_allocs);
fprintf(f, "null strings: %" PY_FORMAT_SIZE_T "d, "
"1-strings: %" PY_FORMAT_SIZE_T "d\n",
null_strings, one_strings);
}
PyObject *
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get_counts(void)
{
PyTypeObject *tp;
PyObject *result;
PyObject *v;
result = PyList_New(0);
if (result == NULL)
return NULL;
for (tp = type_list; tp; tp = tp->tp_next) {
v = Py_BuildValue("(snnn)", tp->tp_name, tp->tp_allocs,
tp->tp_frees, tp->tp_maxalloc);
if (v == NULL) {
Py_DECREF(result);
return NULL;
}
if (PyList_Append(result, v) < 0) {
Py_DECREF(v);
Py_DECREF(result);
return NULL;
}
Py_DECREF(v);
}
return result;
}
void
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inc_count(PyTypeObject *tp)
{
if (tp->tp_next == NULL && tp->tp_prev == NULL) {
/* first time; insert in linked list */
if (tp->tp_next != NULL) /* sanity check */
Py_FatalError("XXX inc_count sanity check");
if (type_list)
type_list->tp_prev = tp;
tp->tp_next = type_list;
/* Note that as of Python 2.2, heap-allocated type objects
* can go away, but this code requires that they stay alive
* until program exit. That's why we're careful with
* refcounts here. type_list gets a new reference to tp,
* while ownership of the reference type_list used to hold
* (if any) was transferred to tp->tp_next in the line above.
* tp is thus effectively immortal after this.
*/
Py_INCREF(tp);
type_list = tp;
#ifdef Py_TRACE_REFS
/* Also insert in the doubly-linked list of all objects,
* if not already there.
*/
_Py_AddToAllObjects((PyObject *)tp, 0);
#endif
}
tp->tp_allocs++;
if (tp->tp_allocs - tp->tp_frees > tp->tp_maxalloc)
tp->tp_maxalloc = tp->tp_allocs - tp->tp_frees;
}
void dec_count(PyTypeObject *tp)
{
tp->tp_frees++;
if (unlist_types_without_objects &&
tp->tp_allocs == tp->tp_frees) {
/* unlink the type from type_list */
if (tp->tp_prev)
tp->tp_prev->tp_next = tp->tp_next;
else
type_list = tp->tp_next;
if (tp->tp_next)
tp->tp_next->tp_prev = tp->tp_prev;
tp->tp_next = tp->tp_prev = NULL;
Py_DECREF(tp);
}
}
#endif
#ifdef Py_REF_DEBUG
/* Log a fatal error; doesn't return. */
void
_Py_NegativeRefcount(const char *fname, int lineno, PyObject *op)
{
char buf[300];
PyOS_snprintf(buf, sizeof(buf),
"%s:%i object at %p has negative ref count "
"%" PY_FORMAT_SIZE_T "d",
fname, lineno, op, op->ob_refcnt);
Py_FatalError(buf);
}
#endif /* Py_REF_DEBUG */
void
Py_IncRef(PyObject *o)
{
Py_XINCREF(o);
}
void
Py_DecRef(PyObject *o)
{
Py_XDECREF(o);
}
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PyObject *
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PyObject_Init(PyObject *op, PyTypeObject *tp)
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{
if (op == NULL)
return PyErr_NoMemory();
/* Any changes should be reflected in PyObject_INIT (objimpl.h) */
Py_TYPE(op) = tp;
_Py_NewReference(op);
return op;
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}
PyVarObject *
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PyObject_InitVar(PyVarObject *op, PyTypeObject *tp, Py_ssize_t size)
{
if (op == NULL)
return (PyVarObject *) PyErr_NoMemory();
/* Any changes should be reflected in PyObject_INIT_VAR */
op->ob_size = size;
Py_TYPE(op) = tp;
_Py_NewReference((PyObject *)op);
return op;
}
PyObject *
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_PyObject_New(PyTypeObject *tp)
{
PyObject *op;
op = (PyObject *) PyObject_MALLOC(_PyObject_SIZE(tp));
if (op == NULL)
return PyErr_NoMemory();
return PyObject_INIT(op, tp);
}
PyVarObject *
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_PyObject_NewVar(PyTypeObject *tp, Py_ssize_t nitems)
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{
PyVarObject *op;
const size_t size = _PyObject_VAR_SIZE(tp, nitems);
op = (PyVarObject *) PyObject_MALLOC(size);
if (op == NULL)
return (PyVarObject *)PyErr_NoMemory();
return PyObject_INIT_VAR(op, tp, nitems);
}
int
PyObject_Print(PyObject *op, FILE *fp, int flags)
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{
int ret = 0;
if (PyErr_CheckSignals())
return -1;
#ifdef USE_STACKCHECK
if (PyOS_CheckStack()) {
PyErr_SetString(PyExc_MemoryError, "stack overflow");
return -1;
}
#endif
clearerr(fp); /* Clear any previous error condition */
if (op == NULL) {
Py_BEGIN_ALLOW_THREADS
fprintf(fp, "<nil>");
Py_END_ALLOW_THREADS
}
else {
if (op->ob_refcnt <= 0)
/* XXX(twouters) cast refcount to long until %zd is
universally available */
Py_BEGIN_ALLOW_THREADS
fprintf(fp, "<refcnt %ld at %p>",
(long)op->ob_refcnt, op);
Py_END_ALLOW_THREADS
else {
PyObject *s;
if (flags & Py_PRINT_RAW)
s = PyObject_Str(op);
else
s = PyObject_Repr(op);
if (s == NULL)
ret = -1;
else if (PyBytes_Check(s)) {
fwrite(PyBytes_AS_STRING(s), 1,
PyBytes_GET_SIZE(s), fp);
}
else if (PyUnicode_Check(s)) {
PyObject *t;
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t = PyUnicode_AsEncodedString(s, "utf-8", "backslashreplace");
if (t == NULL)
ret = 0;
else {
fwrite(PyBytes_AS_STRING(t), 1,
PyBytes_GET_SIZE(t), fp);
Py_DECREF(t);
}
}
else {
PyErr_Format(PyExc_TypeError,
"str() or repr() returned '%.100s'",
s->ob_type->tp_name);
ret = -1;
}
Py_XDECREF(s);
}
}
if (ret == 0) {
if (ferror(fp)) {
PyErr_SetFromErrno(PyExc_IOError);
clearerr(fp);
ret = -1;
}
}
return ret;
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}
/* For debugging convenience. Set a breakpoint here and call it from your DLL */
void
Merged revisions 53451-53537 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r53454 | brett.cannon | 2007-01-15 20:12:08 +0100 (Mon, 15 Jan 2007) | 3 lines Add a note for strptime that just because strftime supports some extra directive that is not documented that strptime will as well. ........ r53458 | vinay.sajip | 2007-01-16 10:50:07 +0100 (Tue, 16 Jan 2007) | 1 line Updated rotating file handlers to use _open(). ........ r53459 | marc-andre.lemburg | 2007-01-16 14:03:06 +0100 (Tue, 16 Jan 2007) | 2 lines Add news items for the recent pybench and platform changes. ........ r53460 | sjoerd.mullender | 2007-01-16 17:42:38 +0100 (Tue, 16 Jan 2007) | 4 lines Fixed ntpath.expandvars to not replace references to non-existing variables with nothing. Also added tests. This fixes bug #494589. ........ r53464 | neal.norwitz | 2007-01-17 07:23:51 +0100 (Wed, 17 Jan 2007) | 1 line Give Calvin Spealman access for python-dev summaries. ........ r53465 | neal.norwitz | 2007-01-17 09:37:26 +0100 (Wed, 17 Jan 2007) | 1 line Remove Calvin since he only has access to the website currently. ........ r53466 | thomas.heller | 2007-01-17 10:40:34 +0100 (Wed, 17 Jan 2007) | 2 lines Replace C++ comments with C comments. ........ r53472 | andrew.kuchling | 2007-01-17 20:55:06 +0100 (Wed, 17 Jan 2007) | 1 line [Part of bug #1599254] Add suggestion to Mailbox docs to use Maildir, and warn user to lock/unlock mailboxes when modifying them ........ r53475 | georg.brandl | 2007-01-17 22:09:04 +0100 (Wed, 17 Jan 2007) | 2 lines Bug #1637967: missing //= operator in list. ........ r53477 | georg.brandl | 2007-01-17 22:19:58 +0100 (Wed, 17 Jan 2007) | 2 lines Bug #1629125: fix wrong data type (int -> Py_ssize_t) in PyDict_Next docs. ........ r53481 | neal.norwitz | 2007-01-18 06:40:58 +0100 (Thu, 18 Jan 2007) | 1 line Try reverting part of r53145 that seems to cause the Windows buildbots to fail in test_uu.UUFileTest.test_encode ........ r53482 | fred.drake | 2007-01-18 06:42:30 +0100 (Thu, 18 Jan 2007) | 1 line add missing version entry ........ r53483 | neal.norwitz | 2007-01-18 07:20:55 +0100 (Thu, 18 Jan 2007) | 7 lines This test doesn't pass on Windows. The cause seems to be that chmod doesn't support the same funcationality as on Unix. I'm not sure if this fix is the best (or if it will even work)--it's a test to see if the buildbots start passing again. It might be better to not even run this test if it's windows (or non-posix). ........ r53488 | neal.norwitz | 2007-01-19 06:53:33 +0100 (Fri, 19 Jan 2007) | 1 line SF #1635217, Fix unbalanced paren ........ r53489 | martin.v.loewis | 2007-01-19 07:42:22 +0100 (Fri, 19 Jan 2007) | 3 lines Prefix AST symbols with _Py_. Fixes #1637022. Will backport. ........ r53497 | martin.v.loewis | 2007-01-19 19:01:38 +0100 (Fri, 19 Jan 2007) | 2 lines Add UUIDs for 2.5.1 and 2.5.2 ........ r53499 | raymond.hettinger | 2007-01-19 19:07:18 +0100 (Fri, 19 Jan 2007) | 1 line SF# 1635892: Fix docs for betavariate's input parameters . ........ r53503 | martin.v.loewis | 2007-01-20 15:05:39 +0100 (Sat, 20 Jan 2007) | 2 lines Merge 53501 and 53502 from 25 branch: Add /GS- for AMD64 and Itanium builds where missing. ........ r53504 | walter.doerwald | 2007-01-20 18:28:31 +0100 (Sat, 20 Jan 2007) | 2 lines Port test_resource.py to unittest. ........ r53505 | walter.doerwald | 2007-01-20 19:19:33 +0100 (Sat, 20 Jan 2007) | 2 lines Add argument tests an calls of resource.getrusage(). ........ r53506 | walter.doerwald | 2007-01-20 20:03:17 +0100 (Sat, 20 Jan 2007) | 2 lines resource.RUSAGE_BOTH might not exist. ........ r53507 | walter.doerwald | 2007-01-21 00:07:28 +0100 (Sun, 21 Jan 2007) | 2 lines Port test_new.py to unittest. ........ r53508 | martin.v.loewis | 2007-01-21 10:33:07 +0100 (Sun, 21 Jan 2007) | 2 lines Patch #1610575: Add support for _Bool to struct. ........ r53509 | georg.brandl | 2007-01-21 11:28:43 +0100 (Sun, 21 Jan 2007) | 3 lines Bug #1486663: don't reject keyword arguments for subclasses of builtin types. ........ r53511 | georg.brandl | 2007-01-21 11:35:10 +0100 (Sun, 21 Jan 2007) | 2 lines Patch #1627441: close sockets properly in urllib2. ........ r53517 | georg.brandl | 2007-01-22 20:40:21 +0100 (Mon, 22 Jan 2007) | 3 lines Use new email module names (#1637162, #1637159, #1637157). ........ r53518 | andrew.kuchling | 2007-01-22 21:26:40 +0100 (Mon, 22 Jan 2007) | 1 line Improve pattern used for mbox 'From' lines; add a simple test ........ r53519 | andrew.kuchling | 2007-01-22 21:27:50 +0100 (Mon, 22 Jan 2007) | 1 line Make comment match the code ........ r53522 | georg.brandl | 2007-01-22 22:10:33 +0100 (Mon, 22 Jan 2007) | 2 lines Bug #1249573: fix rfc822.parsedate not accepting a certain date format ........ r53524 | georg.brandl | 2007-01-22 22:23:41 +0100 (Mon, 22 Jan 2007) | 2 lines Bug #1627316: handle error in condition/ignore pdb commands more gracefully. ........ r53526 | lars.gustaebel | 2007-01-23 12:17:33 +0100 (Tue, 23 Jan 2007) | 4 lines Patch #1507247: tarfile.py: use current umask for intermediate directories. ........ r53527 | thomas.wouters | 2007-01-23 14:42:00 +0100 (Tue, 23 Jan 2007) | 13 lines SF patch #1630975: Fix crash when replacing sys.stdout in sitecustomize When running the interpreter in an environment that would cause it to set stdout/stderr/stdin's encoding, having a sitecustomize that would replace them with something other than PyFile objects would crash the interpreter. Fix it by simply ignoring the encoding-setting for non-files. This could do with a test, but I can think of no maintainable and portable way to test this bug, short of adding a sitecustomize.py to the buildsystem and have it always run with it (hmmm....) ........ r53528 | thomas.wouters | 2007-01-23 14:50:49 +0100 (Tue, 23 Jan 2007) | 4 lines Add news entry about last checkin (oops.) ........ r53531 | martin.v.loewis | 2007-01-23 22:11:47 +0100 (Tue, 23 Jan 2007) | 4 lines Make PyTraceBack_Here use the current thread, not the frame's thread state. Fixes #1579370. Will backport. ........ r53535 | brett.cannon | 2007-01-24 00:21:22 +0100 (Wed, 24 Jan 2007) | 5 lines Fix crasher for when an object's __del__ creates a new weakref to itself. Patch only fixes new-style classes; classic classes still buggy. Closes bug #1377858. Already backported. ........ r53536 | walter.doerwald | 2007-01-24 01:42:19 +0100 (Wed, 24 Jan 2007) | 2 lines Port test_popen.py to unittest. ........
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_Py_BreakPoint(void)
{
}
/* For debugging convenience. See Misc/gdbinit for some useful gdb hooks */
void
_PyObject_Dump(PyObject* op)
{
if (op == NULL)
fprintf(stderr, "NULL\n");
else {
#ifdef WITH_THREAD
PyGILState_STATE gil;
#endif
fprintf(stderr, "object : ");
#ifdef WITH_THREAD
gil = PyGILState_Ensure();
#endif
(void)PyObject_Print(op, stderr, 0);
#ifdef WITH_THREAD
PyGILState_Release(gil);
#endif
/* XXX(twouters) cast refcount to long until %zd is
universally available */
fprintf(stderr, "\n"
"type : %s\n"
"refcount: %ld\n"
"address : %p\n",
Py_TYPE(op)==NULL ? "NULL" : Py_TYPE(op)->tp_name,
(long)op->ob_refcnt,
op);
}
}
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PyObject *
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PyObject_Repr(PyObject *v)
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{
PyObject *res;
if (PyErr_CheckSignals())
return NULL;
#ifdef USE_STACKCHECK
if (PyOS_CheckStack()) {
PyErr_SetString(PyExc_MemoryError, "stack overflow");
return NULL;
}
#endif
if (v == NULL)
return PyUnicode_FromString("<NULL>");
if (Py_TYPE(v)->tp_repr == NULL)
return PyUnicode_FromFormat("<%s object at %p>",
v->ob_type->tp_name, v);
res = (*v->ob_type->tp_repr)(v);
if (res == NULL)
return NULL;
if (!PyUnicode_Check(res)) {
PyErr_Format(PyExc_TypeError,
"__repr__ returned non-string (type %.200s)",
res->ob_type->tp_name);
Py_DECREF(res);
return NULL;
}
#ifndef Py_DEBUG
if (PyUnicode_READY(res) < 0)
return NULL;
#endif
return res;
}
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PyObject *
PyObject_Str(PyObject *v)
{
PyObject *res;
if (PyErr_CheckSignals())
return NULL;
#ifdef USE_STACKCHECK
if (PyOS_CheckStack()) {
PyErr_SetString(PyExc_MemoryError, "stack overflow");
return NULL;
}
#endif
if (v == NULL)
return PyUnicode_FromString("<NULL>");
if (PyUnicode_CheckExact(v)) {
#ifndef Py_DEBUG
if (PyUnicode_READY(v) < 0)
return NULL;
#endif
Py_INCREF(v);
return v;
}
if (Py_TYPE(v)->tp_str == NULL)
return PyObject_Repr(v);
/* It is possible for a type to have a tp_str representation that loops
infinitely. */
if (Py_EnterRecursiveCall(" while getting the str of an object"))
return NULL;
res = (*Py_TYPE(v)->tp_str)(v);
Py_LeaveRecursiveCall();
if (res == NULL)
return NULL;
if (!PyUnicode_Check(res)) {
PyErr_Format(PyExc_TypeError,
"__str__ returned non-string (type %.200s)",
Py_TYPE(res)->tp_name);
Py_DECREF(res);
return NULL;
}
#ifndef Py_DEBUG
if (PyUnicode_READY(res) < 0)
return NULL;
#endif
assert(_PyUnicode_CheckConsistency(res, 1));
return res;
}
PyObject *
PyObject_ASCII(PyObject *v)
{
PyObject *repr, *ascii, *res;
repr = PyObject_Repr(v);
if (repr == NULL)
return NULL;
/* repr is guaranteed to be a PyUnicode object by PyObject_Repr */
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ascii = _PyUnicode_AsASCIIString(repr, "backslashreplace");
Py_DECREF(repr);
if (ascii == NULL)
return NULL;
res = PyUnicode_DecodeASCII(
PyBytes_AS_STRING(ascii),
PyBytes_GET_SIZE(ascii),
NULL);
Py_DECREF(ascii);
return res;
}
Changes to recursive-object comparisons, having to do with a test case I found where rich comparison of unequal recursive objects gave unintuituve results. In a discussion with Tim, where we discovered that our intuition on when a<=b should be true was failing, we decided to outlaw ordering comparisons on recursive objects. (Once we have fixed our intuition and designed a matching algorithm that's practical and reasonable to implement, we can allow such orderings again.) - Refactored the recursive-object comparison framework; more is now done in the support routines so less needs to be done in the calling routines (even at the expense of slowing it down a bit -- this should normally never be invoked, it's mostly just there to avoid blowing up the interpreter). - Changed the framework so that the comparison operator used is also stored. (The dictionary now stores triples (v, w, op) instead of pairs (v, w).) - Changed the nesting limit to a more reasonable small 20; this only slows down comparisons of very deeply nested objects (unlikely to occur in practice), while speeding up comparisons of recursive objects (previously, this would first waste time and space on 500 nested comparisons before it would start detecting recursion). - Changed rich comparisons for recursive objects to raise a ValueError exception when recursion is detected for ordering oprators (<, <=, >, >=). Unrelated change: - Moved PyObject_Unicode() to just under PyObject_Str(), where it belongs. MAL's patch must've inserted in a random spot between two functions in the file -- between two helpers for rich comparison...
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PyObject *
PyObject_Bytes(PyObject *v)
{
PyObject *result, *func;
_Py_IDENTIFIER(__bytes__);
if (v == NULL)
return PyBytes_FromString("<NULL>");
if (PyBytes_CheckExact(v)) {
Py_INCREF(v);
return v;
}
func = _PyObject_LookupSpecial(v, &PyId___bytes__);
if (func != NULL) {
result = PyObject_CallFunctionObjArgs(func, NULL);
Py_DECREF(func);
if (result == NULL)
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return NULL;
if (!PyBytes_Check(result)) {
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PyErr_Format(PyExc_TypeError,
"__bytes__ returned non-bytes (type %.200s)",
Py_TYPE(result)->tp_name);
Py_DECREF(result);
return NULL;
}
return result;
}
else if (PyErr_Occurred())
return NULL;
return PyBytes_FromObject(v);
}
/* For Python 3.0.1 and later, the old three-way comparison has been
completely removed in favour of rich comparisons. PyObject_Compare() and
PyObject_Cmp() are gone, and the builtin cmp function no longer exists.
The old tp_compare slot has been renamed to tp_reserved, and should no
longer be used. Use tp_richcompare instead.
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
See (*) below for practical amendments.
tp_richcompare gets called with a first argument of the appropriate type
and a second object of an arbitrary type. We never do any kind of
coercion.
The tp_richcompare slot should return an object, as follows:
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
NULL if an exception occurred
NotImplemented if the requested comparison is not implemented
any other false value if the requested comparison is false
any other true value if the requested comparison is true
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
The PyObject_RichCompare[Bool]() wrappers raise TypeError when they get
NotImplemented.
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
(*) Practical amendments:
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
- If rich comparison returns NotImplemented, == and != are decided by
comparing the object pointer (i.e. falling back to the base object
implementation).
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
*/
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
/* Map rich comparison operators to their swapped version, e.g. LT <--> GT */
int _Py_SwappedOp[] = {Py_GT, Py_GE, Py_EQ, Py_NE, Py_LT, Py_LE};
static char *opstrings[] = {"<", "<=", "==", "!=", ">", ">="};
1990-10-14 09:07:46 -03:00
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
/* Perform a rich comparison, raising TypeError when the requested comparison
operator is not supported. */
2001-01-21 12:25:18 -04:00
static PyObject *
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
do_richcompare(PyObject *v, PyObject *w, int op)
{
richcmpfunc f;
PyObject *res;
int checked_reverse_op = 0;
if (v->ob_type != w->ob_type &&
PyType_IsSubtype(w->ob_type, v->ob_type) &&
(f = w->ob_type->tp_richcompare) != NULL) {
checked_reverse_op = 1;
res = (*f)(w, v, _Py_SwappedOp[op]);
if (res != Py_NotImplemented)
return res;
Py_DECREF(res);
}
if ((f = v->ob_type->tp_richcompare) != NULL) {
res = (*f)(v, w, op);
if (res != Py_NotImplemented)
return res;
Py_DECREF(res);
}
if (!checked_reverse_op && (f = w->ob_type->tp_richcompare) != NULL) {
res = (*f)(w, v, _Py_SwappedOp[op]);
if (res != Py_NotImplemented)
return res;
Py_DECREF(res);
}
/* If neither object implements it, provide a sensible default
for == and !=, but raise an exception for ordering. */
switch (op) {
case Py_EQ:
res = (v == w) ? Py_True : Py_False;
break;
case Py_NE:
res = (v != w) ? Py_True : Py_False;
break;
default:
/* XXX Special-case None so it doesn't show as NoneType() */
PyErr_Format(PyExc_TypeError,
"unorderable types: %.100s() %s %.100s()",
v->ob_type->tp_name,
opstrings[op],
w->ob_type->tp_name);
return NULL;
}
Py_INCREF(res);
return res;
}
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
/* Perform a rich comparison with object result. This wraps do_richcompare()
with a check for NULL arguments and a recursion check. */
PyObject *
PyObject_RichCompare(PyObject *v, PyObject *w, int op)
{
PyObject *res;
assert(Py_LT <= op && op <= Py_GE);
if (v == NULL || w == NULL) {
if (!PyErr_Occurred())
PyErr_BadInternalCall();
return NULL;
}
if (Py_EnterRecursiveCall(" in comparison"))
return NULL;
res = do_richcompare(v, w, op);
Py_LeaveRecursiveCall();
return res;
}
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
2006-08-23 21:41:19 -03:00
/* Perform a rich comparison with integer result. This wraps
PyObject_RichCompare(), returning -1 for error, 0 for false, 1 for true. */
int
PyObject_RichCompareBool(PyObject *v, PyObject *w, int op)
{
PyObject *res;
int ok;
/* Quick result when objects are the same.
Guarantees that identity implies equality. */
if (v == w) {
if (op == Py_EQ)
return 1;
else if (op == Py_NE)
return 0;
}
res = PyObject_RichCompare(v, w, op);
if (res == NULL)
return -1;
if (PyBool_Check(res))
ok = (res == Py_True);
else
ok = PyObject_IsTrue(res);
Py_DECREF(res);
return ok;
}
/* Set of hash utility functions to help maintaining the invariant that
if a==b then hash(a)==hash(b)
All the utility functions (_Py_Hash*()) return "-1" to signify an error.
*/
/* For numeric types, the hash of a number x is based on the reduction
of x modulo the prime P = 2**_PyHASH_BITS - 1. It's designed so that
hash(x) == hash(y) whenever x and y are numerically equal, even if
x and y have different types.
A quick summary of the hashing strategy:
(1) First define the 'reduction of x modulo P' for any rational
number x; this is a standard extension of the usual notion of
reduction modulo P for integers. If x == p/q (written in lowest
terms), the reduction is interpreted as the reduction of p times
the inverse of the reduction of q, all modulo P; if q is exactly
divisible by P then define the reduction to be infinity. So we've
got a well-defined map
reduce : { rational numbers } -> { 0, 1, 2, ..., P-1, infinity }.
(2) Now for a rational number x, define hash(x) by:
reduce(x) if x >= 0
-reduce(-x) if x < 0
If the result of the reduction is infinity (this is impossible for
integers, floats and Decimals) then use the predefined hash value
_PyHASH_INF for x >= 0, or -_PyHASH_INF for x < 0, instead.
_PyHASH_INF, -_PyHASH_INF and _PyHASH_NAN are also used for the
hashes of float and Decimal infinities and nans.
A selling point for the above strategy is that it makes it possible
to compute hashes of decimal and binary floating-point numbers
efficiently, even if the exponent of the binary or decimal number
is large. The key point is that
reduce(x * y) == reduce(x) * reduce(y) (modulo _PyHASH_MODULUS)
provided that {reduce(x), reduce(y)} != {0, infinity}. The reduction of a
binary or decimal float is never infinity, since the denominator is a power
of 2 (for binary) or a divisor of a power of 10 (for decimal). So we have,
for nonnegative x,
reduce(x * 2**e) == reduce(x) * reduce(2**e) % _PyHASH_MODULUS
reduce(x * 10**e) == reduce(x) * reduce(10**e) % _PyHASH_MODULUS
and reduce(10**e) can be computed efficiently by the usual modular
exponentiation algorithm. For reduce(2**e) it's even better: since
P is of the form 2**n-1, reduce(2**e) is 2**(e mod n), and multiplication
by 2**(e mod n) modulo 2**n-1 just amounts to a rotation of bits.
*/
Py_hash_t
2000-07-09 12:48:49 -03:00
_Py_HashDouble(double v)
{
int e, sign;
double m;
Py_uhash_t x, y;
if (!Py_IS_FINITE(v)) {
if (Py_IS_INFINITY(v))
return v > 0 ? _PyHASH_INF : -_PyHASH_INF;
else
return _PyHASH_NAN;
}
m = frexp(v, &e);
sign = 1;
if (m < 0) {
sign = -1;
m = -m;
}
/* process 28 bits at a time; this should work well both for binary
and hexadecimal floating point. */
x = 0;
while (m) {
x = ((x << 28) & _PyHASH_MODULUS) | x >> (_PyHASH_BITS - 28);
m *= 268435456.0; /* 2**28 */
e -= 28;
y = (Py_uhash_t)m; /* pull out integer part */
m -= y;
x += y;
if (x >= _PyHASH_MODULUS)
x -= _PyHASH_MODULUS;
}
/* adjust for the exponent; first reduce it modulo _PyHASH_BITS */
e = e >= 0 ? e % _PyHASH_BITS : _PyHASH_BITS-1-((-1-e) % _PyHASH_BITS);
x = ((x << e) & _PyHASH_MODULUS) | x >> (_PyHASH_BITS - e);
x = x * sign;
if (x == (Py_uhash_t)-1)
x = (Py_uhash_t)-2;
return (Py_hash_t)x;
}
Py_hash_t
2000-07-09 12:48:49 -03:00
_Py_HashPointer(void *p)
{
Py_hash_t x;
size_t y = (size_t)p;
/* bottom 3 or 4 bits are likely to be 0; rotate y by 4 to avoid
excessive hash collisions for dicts and sets */
y = (y >> 4) | (y << (8 * SIZEOF_VOID_P - 4));
x = (Py_hash_t)y;
if (x == -1)
x = -2;
return x;
}
Py_hash_t
_Py_HashBytes(unsigned char *p, Py_ssize_t len)
{
Py_uhash_t x;
Py_ssize_t i;
/*
We make the hash of the empty string be 0, rather than using
(prefix ^ suffix), since this slightly obfuscates the hash secret
*/
2012-04-09 16:04:39 -03:00
#ifdef Py_DEBUG
2012-02-21 12:12:14 -04:00
assert(_Py_HashSecret_Initialized);
2012-04-09 16:04:39 -03:00
#endif
if (len == 0) {
return 0;
}
x = (Py_uhash_t) _Py_HashSecret.prefix;
x ^= (Py_uhash_t) *p << 7;
for (i = 0; i < len; i++)
x = (_PyHASH_MULTIPLIER * x) ^ (Py_uhash_t) *p++;
x ^= (Py_uhash_t) len;
x ^= (Py_uhash_t) _Py_HashSecret.suffix;
if (x == -1)
x = -2;
return x;
}
Py_hash_t
PyObject_HashNotImplemented(PyObject *v)
{
PyErr_Format(PyExc_TypeError, "unhashable type: '%.200s'",
Py_TYPE(v)->tp_name);
return -1;
}
_Py_HashSecret_t _Py_HashSecret;
Py_hash_t
2000-07-09 12:48:49 -03:00
PyObject_Hash(PyObject *v)
{
PyTypeObject *tp = Py_TYPE(v);
if (tp->tp_hash != NULL)
return (*tp->tp_hash)(v);
/* To keep to the general practice that inheriting
* solely from object in C code should work without
* an explicit call to PyType_Ready, we implicitly call
* PyType_Ready here and then check the tp_hash slot again
*/
if (tp->tp_dict == NULL) {
if (PyType_Ready(tp) < 0)
return -1;
if (tp->tp_hash != NULL)
return (*tp->tp_hash)(v);
}
/* Otherwise, the object can't be hashed */
return PyObject_HashNotImplemented(v);
}
1997-05-02 00:12:38 -03:00
PyObject *
PyObject_GetAttrString(PyObject *v, const char *name)
1990-12-20 11:06:42 -04:00
{
PyObject *w, *res;
if (Py_TYPE(v)->tp_getattr != NULL)
return (*Py_TYPE(v)->tp_getattr)(v, (char*)name);
w = PyUnicode_InternFromString(name);
if (w == NULL)
return NULL;
res = PyObject_GetAttr(v, w);
Py_DECREF(w);
return res;
1990-12-20 11:06:42 -04:00
}
int
PyObject_HasAttrString(PyObject *v, const char *name)
{
PyObject *res = PyObject_GetAttrString(v, name);
if (res != NULL) {
Py_DECREF(res);
return 1;
}
PyErr_Clear();
return 0;
}
1990-12-20 11:06:42 -04:00
int
PyObject_SetAttrString(PyObject *v, const char *name, PyObject *w)
1990-12-20 11:06:42 -04:00
{
PyObject *s;
int res;
if (Py_TYPE(v)->tp_setattr != NULL)
return (*Py_TYPE(v)->tp_setattr)(v, (char*)name, w);
s = PyUnicode_InternFromString(name);
if (s == NULL)
return -1;
res = PyObject_SetAttr(v, s, w);
Py_XDECREF(s);
return res;
}
int
_PyObject_IsAbstract(PyObject *obj)
{
int res;
PyObject* isabstract;
_Py_IDENTIFIER(__isabstractmethod__);
if (obj == NULL)
return 0;
isabstract = _PyObject_GetAttrId(obj, &PyId___isabstractmethod__);
if (isabstract == NULL) {
if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
return 0;
}
return -1;
}
res = PyObject_IsTrue(isabstract);
Py_DECREF(isabstract);
return res;
}
PyObject *
_PyObject_GetAttrId(PyObject *v, _Py_Identifier *name)
{
PyObject *result;
PyObject *oname = _PyUnicode_FromId(name); /* borrowed */
if (!oname)
return NULL;
result = PyObject_GetAttr(v, oname);
return result;
}
int
_PyObject_HasAttrId(PyObject *v, _Py_Identifier *name)
{
int result;
PyObject *oname = _PyUnicode_FromId(name); /* borrowed */
if (!oname)
return -1;
result = PyObject_HasAttr(v, oname);
return result;
}
int
_PyObject_SetAttrId(PyObject *v, _Py_Identifier *name, PyObject *w)
{
int result;
PyObject *oname = _PyUnicode_FromId(name); /* borrowed */
if (!oname)
return -1;
result = PyObject_SetAttr(v, oname, w);
return result;
}
PyObject *
2000-07-09 12:48:49 -03:00
PyObject_GetAttr(PyObject *v, PyObject *name)
{
PyTypeObject *tp = Py_TYPE(v);
if (!PyUnicode_Check(name)) {
PyErr_Format(PyExc_TypeError,
"attribute name must be string, not '%.200s'",
name->ob_type->tp_name);
return NULL;
}
if (tp->tp_getattro != NULL)
return (*tp->tp_getattro)(v, name);
if (tp->tp_getattr != NULL) {
char *name_str = _PyUnicode_AsString(name);
if (name_str == NULL)
return NULL;
return (*tp->tp_getattr)(v, name_str);
}
PyErr_Format(PyExc_AttributeError,
"'%.50s' object has no attribute '%U'",
tp->tp_name, name);
return NULL;
}
int
2000-07-09 12:48:49 -03:00
PyObject_HasAttr(PyObject *v, PyObject *name)
{
PyObject *res = PyObject_GetAttr(v, name);
if (res != NULL) {
Py_DECREF(res);
return 1;
}
PyErr_Clear();
return 0;
}
int
2000-07-09 12:48:49 -03:00
PyObject_SetAttr(PyObject *v, PyObject *name, PyObject *value)
{
PyTypeObject *tp = Py_TYPE(v);
int err;
if (!PyUnicode_Check(name)) {
PyErr_Format(PyExc_TypeError,
"attribute name must be string, not '%.200s'",
name->ob_type->tp_name);
return -1;
}
Py_INCREF(name);
PyUnicode_InternInPlace(&name);
if (tp->tp_setattro != NULL) {
err = (*tp->tp_setattro)(v, name, value);
Py_DECREF(name);
return err;
}
if (tp->tp_setattr != NULL) {
char *name_str = _PyUnicode_AsString(name);
if (name_str == NULL)
return -1;
err = (*tp->tp_setattr)(v, name_str, value);
Py_DECREF(name);
return err;
}
Py_DECREF(name);
assert(name->ob_refcnt >= 1);
if (tp->tp_getattr == NULL && tp->tp_getattro == NULL)
PyErr_Format(PyExc_TypeError,
"'%.100s' object has no attributes "
"(%s .%U)",
tp->tp_name,
value==NULL ? "del" : "assign to",
name);
else
PyErr_Format(PyExc_TypeError,
"'%.100s' object has only read-only attributes "
"(%s .%U)",
tp->tp_name,
value==NULL ? "del" : "assign to",
name);
return -1;
2001-08-02 01:15:00 -03:00
}
/* Helper to get a pointer to an object's __dict__ slot, if any */
PyObject **
_PyObject_GetDictPtr(PyObject *obj)
{
Py_ssize_t dictoffset;
PyTypeObject *tp = Py_TYPE(obj);
2001-08-02 01:15:00 -03:00
dictoffset = tp->tp_dictoffset;
if (dictoffset == 0)
return NULL;
if (dictoffset < 0) {
Py_ssize_t tsize;
size_t size;
tsize = ((PyVarObject *)obj)->ob_size;
if (tsize < 0)
tsize = -tsize;
size = _PyObject_VAR_SIZE(tp, tsize);
dictoffset += (long)size;
assert(dictoffset > 0);
assert(dictoffset % SIZEOF_VOID_P == 0);
}
return (PyObject **) ((char *)obj + dictoffset);
2001-08-02 01:15:00 -03:00
}
PyObject *
PyObject_SelfIter(PyObject *obj)
{
Py_INCREF(obj);
return obj;
}
/* Convenience function to get a builtin from its name */
PyObject *
_PyObject_GetBuiltin(const char *name)
{
PyObject *mod, *attr;
mod = PyImport_ImportModule("builtins");
if (mod == NULL)
return NULL;
attr = PyObject_GetAttrString(mod, name);
Py_DECREF(mod);
return attr;
}
/* Helper used when the __next__ method is removed from a type:
tp_iternext is never NULL and can be safely called without checking
on every iteration.
*/
PyObject *
_PyObject_NextNotImplemented(PyObject *self)
{
PyErr_Format(PyExc_TypeError,
"'%.200s' object is not iterable",
Py_TYPE(self)->tp_name);
return NULL;
}
/* Generic GetAttr functions - put these in your tp_[gs]etattro slot */
2001-08-02 01:15:00 -03:00
PyObject *
_PyObject_GenericGetAttrWithDict(PyObject *obj, PyObject *name, PyObject *dict)
2001-08-02 01:15:00 -03:00
{
PyTypeObject *tp = Py_TYPE(obj);
PyObject *descr = NULL;
PyObject *res = NULL;
descrgetfunc f;
Py_ssize_t dictoffset;
PyObject **dictptr;
if (!PyUnicode_Check(name)){
PyErr_Format(PyExc_TypeError,
"attribute name must be string, not '%.200s'",
name->ob_type->tp_name);
return NULL;
}
else
Py_INCREF(name);
if (tp->tp_dict == NULL) {
if (PyType_Ready(tp) < 0)
goto done;
}
2001-08-02 01:15:00 -03:00
descr = _PyType_Lookup(tp, name);
Py_XINCREF(descr);
f = NULL;
if (descr != NULL) {
f = descr->ob_type->tp_descr_get;
if (f != NULL && PyDescr_IsData(descr)) {
res = f(descr, obj, (PyObject *)obj->ob_type);
goto done;
}
}
if (dict == NULL) {
/* Inline _PyObject_GetDictPtr */
dictoffset = tp->tp_dictoffset;
if (dictoffset != 0) {
if (dictoffset < 0) {
Py_ssize_t tsize;
size_t size;
tsize = ((PyVarObject *)obj)->ob_size;
if (tsize < 0)
tsize = -tsize;
size = _PyObject_VAR_SIZE(tp, tsize);
dictoffset += (long)size;
assert(dictoffset > 0);
assert(dictoffset % SIZEOF_VOID_P == 0);
}
dictptr = (PyObject **) ((char *)obj + dictoffset);
dict = *dictptr;
}
}
if (dict != NULL) {
Py_INCREF(dict);
res = PyDict_GetItem(dict, name);
if (res != NULL) {
Py_INCREF(res);
Py_DECREF(dict);
goto done;
}
Py_DECREF(dict);
}
if (f != NULL) {
res = f(descr, obj, (PyObject *)Py_TYPE(obj));
goto done;
}
if (descr != NULL) {
res = descr;
descr = NULL;
goto done;
}
PyErr_Format(PyExc_AttributeError,
"'%.50s' object has no attribute '%U'",
tp->tp_name, name);
done:
Py_XDECREF(descr);
Py_DECREF(name);
return res;
2001-08-02 01:15:00 -03:00
}
PyObject *
PyObject_GenericGetAttr(PyObject *obj, PyObject *name)
{
return _PyObject_GenericGetAttrWithDict(obj, name, NULL);
}
2001-08-02 01:15:00 -03:00
int
_PyObject_GenericSetAttrWithDict(PyObject *obj, PyObject *name,
PyObject *value, PyObject *dict)
2001-08-02 01:15:00 -03:00
{
PyTypeObject *tp = Py_TYPE(obj);
PyObject *descr;
descrsetfunc f;
PyObject **dictptr;
int res = -1;
if (!PyUnicode_Check(name)){
PyErr_Format(PyExc_TypeError,
"attribute name must be string, not '%.200s'",
name->ob_type->tp_name);
return -1;
}
2012-03-09 11:25:32 -04:00
if (tp->tp_dict == NULL && PyType_Ready(tp) < 0)
return -1;
Py_INCREF(name);
descr = _PyType_Lookup(tp, name);
Py_XINCREF(descr);
f = NULL;
if (descr != NULL) {
f = descr->ob_type->tp_descr_set;
if (f != NULL && PyDescr_IsData(descr)) {
res = f(descr, obj, value);
goto done;
}
}
if (dict == NULL) {
dictptr = _PyObject_GetDictPtr(obj);
if (dictptr != NULL) {
res = _PyObjectDict_SetItem(Py_TYPE(obj), dictptr, name, value);
if (res < 0 && PyErr_ExceptionMatches(PyExc_KeyError))
PyErr_SetObject(PyExc_AttributeError, name);
goto done;
}
}
if (dict != NULL) {
Py_INCREF(dict);
if (value == NULL)
res = PyDict_DelItem(dict, name);
else
res = PyDict_SetItem(dict, name, value);
2012-03-09 11:25:32 -04:00
Py_DECREF(dict);
if (res < 0 && PyErr_ExceptionMatches(PyExc_KeyError))
PyErr_SetObject(PyExc_AttributeError, name);
goto done;
}
if (f != NULL) {
res = f(descr, obj, value);
goto done;
}
if (descr == NULL) {
PyErr_Format(PyExc_AttributeError,
"'%.100s' object has no attribute '%U'",
tp->tp_name, name);
goto done;
}
PyErr_Format(PyExc_AttributeError,
"'%.50s' object attribute '%U' is read-only",
tp->tp_name, name);
done:
Py_XDECREF(descr);
Py_DECREF(name);
return res;
}
int
PyObject_GenericSetAttr(PyObject *obj, PyObject *name, PyObject *value)
{
return _PyObject_GenericSetAttrWithDict(obj, name, value, NULL);
}
int
PyObject_GenericSetDict(PyObject *obj, PyObject *value, void *context)
{
PyObject *dict, **dictptr = _PyObject_GetDictPtr(obj);
if (dictptr == NULL) {
PyErr_SetString(PyExc_AttributeError,
"This object has no __dict__");
return -1;
}
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "cannot delete __dict__");
return -1;
}
if (!PyDict_Check(value)) {
PyErr_Format(PyExc_TypeError,
"__dict__ must be set to a dictionary, "
"not a '%.200s'", Py_TYPE(value)->tp_name);
return -1;
}
dict = *dictptr;
Py_XINCREF(value);
*dictptr = value;
Py_XDECREF(dict);
return 0;
}
/* Test a value used as condition, e.g., in a for or if statement.
Return -1 if an error occurred */
int
2000-07-09 12:48:49 -03:00
PyObject_IsTrue(PyObject *v)
{
Py_ssize_t res;
if (v == Py_True)
return 1;
if (v == Py_False)
return 0;
if (v == Py_None)
return 0;
else if (v->ob_type->tp_as_number != NULL &&
v->ob_type->tp_as_number->nb_bool != NULL)
res = (*v->ob_type->tp_as_number->nb_bool)(v);
else if (v->ob_type->tp_as_mapping != NULL &&
v->ob_type->tp_as_mapping->mp_length != NULL)
res = (*v->ob_type->tp_as_mapping->mp_length)(v);
else if (v->ob_type->tp_as_sequence != NULL &&
v->ob_type->tp_as_sequence->sq_length != NULL)
res = (*v->ob_type->tp_as_sequence->sq_length)(v);
else
return 1;
/* if it is negative, it should be either -1 or -2 */
return (res > 0) ? 1 : Py_SAFE_DOWNCAST(res, Py_ssize_t, int);
1990-12-20 11:06:42 -04:00
}
/* equivalent of 'not v'
1998-04-09 14:53:59 -03:00
Return -1 if an error occurred */
int
2000-07-09 12:48:49 -03:00
PyObject_Not(PyObject *v)
1998-04-09 14:53:59 -03:00
{
int res;
res = PyObject_IsTrue(v);
if (res < 0)
return res;
return res == 0;
1998-04-09 14:53:59 -03:00
}
1995-01-25 20:38:22 -04:00
/* Test whether an object can be called */
int
2000-07-09 12:48:49 -03:00
PyCallable_Check(PyObject *x)
1995-01-25 20:38:22 -04:00
{
if (x == NULL)
return 0;
return x->ob_type->tp_call != NULL;
1995-01-25 20:38:22 -04:00
}
/* Helper for PyObject_Dir without arguments: returns the local scope. */
static PyObject *
_dir_locals(void)
{
PyObject *names;
PyObject *locals = PyEval_GetLocals();
if (locals == NULL) {
PyErr_SetString(PyExc_SystemError, "frame does not exist");
return NULL;
}
names = PyMapping_Keys(locals);
if (!names)
return NULL;
if (!PyList_Check(names)) {
PyErr_Format(PyExc_TypeError,
"dir(): expected keys() of locals to be a list, "
"not '%.200s'", Py_TYPE(names)->tp_name);
Py_DECREF(names);
return NULL;
}
2011-06-11 18:12:08 -03:00
if (PyList_Sort(names)) {
Py_DECREF(names);
return NULL;
}
/* the locals don't need to be DECREF'd */
return names;
}
/* Helper for PyObject_Dir: object introspection. */
static PyObject *
_dir_object(PyObject *obj)
{
2011-06-11 18:12:08 -03:00
PyObject *result, *sorted;
_Py_IDENTIFIER(__dir__);
PyObject *dirfunc = _PyObject_LookupSpecial(obj, &PyId___dir__);
assert(obj);
if (dirfunc == NULL) {
if (!PyErr_Occurred())
PyErr_SetString(PyExc_TypeError, "object does not provide __dir__");
return NULL;
}
/* use __dir__ */
result = PyObject_CallFunctionObjArgs(dirfunc, NULL);
Py_DECREF(dirfunc);
if (result == NULL)
return NULL;
2011-06-11 18:12:08 -03:00
/* return sorted(result) */
sorted = PySequence_List(result);
Py_DECREF(result);
if (sorted == NULL)
return NULL;
if (PyList_Sort(sorted)) {
Py_DECREF(sorted);
return NULL;
}
2011-06-11 18:12:08 -03:00
return sorted;
}
/* Implementation of dir() -- if obj is NULL, returns the names in the current
(local) scope. Otherwise, performs introspection of the object: returns a
sorted list of attribute names (supposedly) accessible from the object
*/
PyObject *
PyObject_Dir(PyObject *obj)
{
2011-06-11 18:12:08 -03:00
return (obj == NULL) ? _dir_locals() : _dir_object(obj);
}
1995-01-25 20:38:22 -04:00
1990-10-14 09:07:46 -03:00
/*
None is a non-NULL undefined value.
1990-10-14 09:07:46 -03:00
There is (and should be!) no way to create other objects of this type,
1990-12-20 11:06:42 -04:00
so there is exactly one (which is indestructible, by the way).
1990-10-14 09:07:46 -03:00
*/
1992-03-27 13:26:13 -04:00
/* ARGSUSED */
1997-05-02 00:12:38 -03:00
static PyObject *
2000-07-09 12:48:49 -03:00
none_repr(PyObject *op)
1990-12-20 11:06:42 -04:00
{
return PyUnicode_FromString("None");
1990-10-14 09:07:46 -03:00
}
/* ARGUSED */
static void
none_dealloc(PyObject* ignore)
{
/* This should never get called, but we also don't want to SEGV if
* we accidentally decref None out of existence.
*/
Py_FatalError("deallocating None");
}
static PyObject *
none_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
if (PyTuple_GET_SIZE(args) || (kwargs && PyDict_Size(kwargs))) {
PyErr_SetString(PyExc_TypeError, "NoneType takes no arguments");
return NULL;
}
Py_RETURN_NONE;
}
static int
none_bool(PyObject *v)
{
return 0;
}
static PyNumberMethods none_as_number = {
0, /* nb_add */
0, /* nb_subtract */
0, /* nb_multiply */
0, /* nb_remainder */
0, /* nb_divmod */
0, /* nb_power */
0, /* nb_negative */
0, /* nb_positive */
0, /* nb_absolute */
(inquiry)none_bool, /* nb_bool */
0, /* nb_invert */
0, /* nb_lshift */
0, /* nb_rshift */
0, /* nb_and */
0, /* nb_xor */
0, /* nb_or */
0, /* nb_int */
0, /* nb_reserved */
0, /* nb_float */
0, /* nb_inplace_add */
0, /* nb_inplace_subtract */
0, /* nb_inplace_multiply */
0, /* nb_inplace_remainder */
0, /* nb_inplace_power */
0, /* nb_inplace_lshift */
0, /* nb_inplace_rshift */
0, /* nb_inplace_and */
0, /* nb_inplace_xor */
0, /* nb_inplace_or */
0, /* nb_floor_divide */
0, /* nb_true_divide */
0, /* nb_inplace_floor_divide */
0, /* nb_inplace_true_divide */
0, /* nb_index */
};
static PyTypeObject PyNone_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"NoneType",
0,
0,
none_dealloc, /*tp_dealloc*/ /*never called*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
none_repr, /*tp_repr*/
&none_as_number, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call */
0, /*tp_str */
0, /*tp_getattro */
0, /*tp_setattro */
0, /*tp_as_buffer */
Py_TPFLAGS_DEFAULT, /*tp_flags */
0, /*tp_doc */
0, /*tp_traverse */
0, /*tp_clear */
0, /*tp_richcompare */
0, /*tp_weaklistoffset */
0, /*tp_iter */
0, /*tp_iternext */
0, /*tp_methods */
0, /*tp_members */
0, /*tp_getset */
0, /*tp_base */
0, /*tp_dict */
0, /*tp_descr_get */
0, /*tp_descr_set */
0, /*tp_dictoffset */
0, /*tp_init */
0, /*tp_alloc */
none_new, /*tp_new */
1990-10-14 09:07:46 -03:00
};
1997-05-02 00:12:38 -03:00
PyObject _Py_NoneStruct = {
_PyObject_EXTRA_INIT
1, &PyNone_Type
1990-10-14 09:07:46 -03:00
};
/* NotImplemented is an object that can be used to signal that an
operation is not implemented for the given type combination. */
static PyObject *
NotImplemented_repr(PyObject *op)
{
return PyUnicode_FromString("NotImplemented");
}
2011-07-29 20:27:44 -03:00
static PyObject *
notimplemented_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
if (PyTuple_GET_SIZE(args) || (kwargs && PyDict_Size(kwargs))) {
PyErr_SetString(PyExc_TypeError, "NotImplementedType takes no arguments");
return NULL;
}
Py_RETURN_NOTIMPLEMENTED;
2011-07-29 20:27:44 -03:00
}
static PyTypeObject PyNotImplemented_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"NotImplementedType",
0,
0,
none_dealloc, /*tp_dealloc*/ /*never called*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
NotImplemented_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
2011-07-29 20:27:44 -03:00
0, /*tp_call */
0, /*tp_str */
0, /*tp_getattro */
0, /*tp_setattro */
0, /*tp_as_buffer */
Py_TPFLAGS_DEFAULT, /*tp_flags */
0, /*tp_doc */
0, /*tp_traverse */
0, /*tp_clear */
0, /*tp_richcompare */
0, /*tp_weaklistoffset */
0, /*tp_iter */
0, /*tp_iternext */
0, /*tp_methods */
0, /*tp_members */
0, /*tp_getset */
0, /*tp_base */
0, /*tp_dict */
0, /*tp_descr_get */
0, /*tp_descr_set */
0, /*tp_dictoffset */
0, /*tp_init */
0, /*tp_alloc */
notimplemented_new, /*tp_new */
};
PyObject _Py_NotImplementedStruct = {
_PyObject_EXTRA_INIT
1, &PyNotImplemented_Type
};
void
_Py_ReadyTypes(void)
{
if (PyType_Ready(&PyType_Type) < 0)
Py_FatalError("Can't initialize type type");
if (PyType_Ready(&_PyWeakref_RefType) < 0)
Py_FatalError("Can't initialize weakref type");
if (PyType_Ready(&_PyWeakref_CallableProxyType) < 0)
Py_FatalError("Can't initialize callable weakref proxy type");
if (PyType_Ready(&_PyWeakref_ProxyType) < 0)
Py_FatalError("Can't initialize weakref proxy type");
if (PyType_Ready(&PyBool_Type) < 0)
Py_FatalError("Can't initialize bool type");
if (PyType_Ready(&PyByteArray_Type) < 0)
Py_FatalError("Can't initialize bytearray type");
if (PyType_Ready(&PyBytes_Type) < 0)
Py_FatalError("Can't initialize 'str'");
if (PyType_Ready(&PyList_Type) < 0)
Py_FatalError("Can't initialize list type");
if (PyType_Ready(&PyNone_Type) < 0)
Py_FatalError("Can't initialize None type");
if (PyType_Ready(&PyNotImplemented_Type) < 0)
Py_FatalError("Can't initialize NotImplemented type");
if (PyType_Ready(&PyTraceBack_Type) < 0)
Py_FatalError("Can't initialize traceback type");
if (PyType_Ready(&PySuper_Type) < 0)
Py_FatalError("Can't initialize super type");
if (PyType_Ready(&PyBaseObject_Type) < 0)
Py_FatalError("Can't initialize object type");
if (PyType_Ready(&PyRange_Type) < 0)
Py_FatalError("Can't initialize range type");
if (PyType_Ready(&PyDict_Type) < 0)
Py_FatalError("Can't initialize dict type");
if (PyType_Ready(&PySet_Type) < 0)
Py_FatalError("Can't initialize set type");
if (PyType_Ready(&PyUnicode_Type) < 0)
Py_FatalError("Can't initialize str type");
if (PyType_Ready(&PySlice_Type) < 0)
Py_FatalError("Can't initialize slice type");
if (PyType_Ready(&PyStaticMethod_Type) < 0)
Py_FatalError("Can't initialize static method type");
if (PyType_Ready(&PyComplex_Type) < 0)
Py_FatalError("Can't initialize complex type");
if (PyType_Ready(&PyFloat_Type) < 0)
Py_FatalError("Can't initialize float type");
if (PyType_Ready(&PyLong_Type) < 0)
Py_FatalError("Can't initialize int type");
if (PyType_Ready(&PyFrozenSet_Type) < 0)
Py_FatalError("Can't initialize frozenset type");
if (PyType_Ready(&PyProperty_Type) < 0)
Py_FatalError("Can't initialize property type");
if (PyType_Ready(&_PyManagedBuffer_Type) < 0)
Py_FatalError("Can't initialize managed buffer type");
if (PyType_Ready(&PyMemoryView_Type) < 0)
Py_FatalError("Can't initialize memoryview type");
if (PyType_Ready(&PyTuple_Type) < 0)
Py_FatalError("Can't initialize tuple type");
if (PyType_Ready(&PyEnum_Type) < 0)
Py_FatalError("Can't initialize enumerate type");
if (PyType_Ready(&PyReversed_Type) < 0)
Py_FatalError("Can't initialize reversed type");
Restructure comparison dramatically. There is no longer a default *ordering* between objects; there is only a default equality test (defined by an object being equal to itself only). Read the comment in object.c. The current implementation never uses a three-way comparison to compute a rich comparison, but it does use a rich comparison to compute a three-way comparison. I'm not quite done ripping out all the calls to PyObject_Compare/Cmp, or replacing tp_compare implementations with tp_richcompare implementations; but much of that has happened (to make most unit tests pass). The following tests still fail, because I need help deciding or understanding: test_codeop -- depends on comparing code objects test_datetime -- need Tim Peters' opinion test_marshal -- depends on comparing code objects test_mutants -- need help understanding it The problem with test_codeop and test_marshal is this: these tests compare two different code objects and expect them to be equal. Is that still a feature we'd like to support? I've temporarily removed the comparison and hash code from code objects, so they use the default (equality by pointer only) comparison. For the other two tests, run them to see for yourself. (There may be more failing test with "-u all".) A general problem with getting lots of these tests to pass is the reality that for object types that have a natural total ordering, implementing __cmp__ is much more convenient than implementing __eq__, __ne__, __lt__, and so on. Should we go back to allowing __cmp__ to provide a total ordering? Should we provide some other way to implement rich comparison with a single method override? Alex proposed a __key__() method; I've considered a __richcmp__() method. Or perhaps __cmp__() just shouldn't be killed off...
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if (PyType_Ready(&PyStdPrinter_Type) < 0)
Py_FatalError("Can't initialize StdPrinter");
if (PyType_Ready(&PyCode_Type) < 0)
Py_FatalError("Can't initialize code type");
if (PyType_Ready(&PyFrame_Type) < 0)
Py_FatalError("Can't initialize frame type");
if (PyType_Ready(&PyCFunction_Type) < 0)
Py_FatalError("Can't initialize builtin function type");
if (PyType_Ready(&PyMethod_Type) < 0)
Py_FatalError("Can't initialize method type");
if (PyType_Ready(&PyFunction_Type) < 0)
Py_FatalError("Can't initialize function type");
if (PyType_Ready(&PyDictProxy_Type) < 0)
Py_FatalError("Can't initialize dict proxy type");
if (PyType_Ready(&PyGen_Type) < 0)
Py_FatalError("Can't initialize generator type");
if (PyType_Ready(&PyGetSetDescr_Type) < 0)
Py_FatalError("Can't initialize get-set descriptor type");
if (PyType_Ready(&PyWrapperDescr_Type) < 0)
Py_FatalError("Can't initialize wrapper type");
if (PyType_Ready(&_PyMethodWrapper_Type) < 0)
Py_FatalError("Can't initialize method wrapper type");
if (PyType_Ready(&PyEllipsis_Type) < 0)
Py_FatalError("Can't initialize ellipsis type");
if (PyType_Ready(&PyMemberDescr_Type) < 0)
Py_FatalError("Can't initialize member descriptor type");
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if (PyType_Ready(&PyFilter_Type) < 0)
Py_FatalError("Can't initialize filter type");
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if (PyType_Ready(&PyMap_Type) < 0)
Py_FatalError("Can't initialize map type");
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if (PyType_Ready(&PyZip_Type) < 0)
Py_FatalError("Can't initialize zip type");
}
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#ifdef Py_TRACE_REFS
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void
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_Py_NewReference(PyObject *op)
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{
_Py_INC_REFTOTAL;
op->ob_refcnt = 1;
_Py_AddToAllObjects(op, 1);
_Py_INC_TPALLOCS(op);
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}
void
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_Py_ForgetReference(register PyObject *op)
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{
#ifdef SLOW_UNREF_CHECK
register PyObject *p;
#endif
if (op->ob_refcnt < 0)
Py_FatalError("UNREF negative refcnt");
if (op == &refchain ||
op->_ob_prev->_ob_next != op || op->_ob_next->_ob_prev != op) {
fprintf(stderr, "* ob\n");
_PyObject_Dump(op);
fprintf(stderr, "* op->_ob_prev->_ob_next\n");
_PyObject_Dump(op->_ob_prev->_ob_next);
fprintf(stderr, "* op->_ob_next->_ob_prev\n");
_PyObject_Dump(op->_ob_next->_ob_prev);
Py_FatalError("UNREF invalid object");
}
#ifdef SLOW_UNREF_CHECK
for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) {
if (p == op)
break;
}
if (p == &refchain) /* Not found */
Py_FatalError("UNREF unknown object");
#endif
op->_ob_next->_ob_prev = op->_ob_prev;
op->_ob_prev->_ob_next = op->_ob_next;
op->_ob_next = op->_ob_prev = NULL;
_Py_INC_TPFREES(op);
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}
void
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_Py_Dealloc(PyObject *op)
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{
destructor dealloc = Py_TYPE(op)->tp_dealloc;
_Py_ForgetReference(op);
(*dealloc)(op);
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}
/* Print all live objects. Because PyObject_Print is called, the
* interpreter must be in a healthy state.
*/
void
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_Py_PrintReferences(FILE *fp)
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{
PyObject *op;
fprintf(fp, "Remaining objects:\n");
for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
fprintf(fp, "%p [%" PY_FORMAT_SIZE_T "d] ", op, op->ob_refcnt);
if (PyObject_Print(op, fp, 0) != 0)
PyErr_Clear();
putc('\n', fp);
}
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}
/* Print the addresses of all live objects. Unlike _Py_PrintReferences, this
* doesn't make any calls to the Python C API, so is always safe to call.
*/
void
_Py_PrintReferenceAddresses(FILE *fp)
{
PyObject *op;
fprintf(fp, "Remaining object addresses:\n");
for (op = refchain._ob_next; op != &refchain; op = op->_ob_next)
fprintf(fp, "%p [%" PY_FORMAT_SIZE_T "d] %s\n", op,
op->ob_refcnt, Py_TYPE(op)->tp_name);
}
PyObject *
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_Py_GetObjects(PyObject *self, PyObject *args)
{
int i, n;
PyObject *t = NULL;
PyObject *res, *op;
if (!PyArg_ParseTuple(args, "i|O", &n, &t))
return NULL;
op = refchain._ob_next;
res = PyList_New(0);
if (res == NULL)
return NULL;
for (i = 0; (n == 0 || i < n) && op != &refchain; i++) {
while (op == self || op == args || op == res || op == t ||
(t != NULL && Py_TYPE(op) != (PyTypeObject *) t)) {
op = op->_ob_next;
if (op == &refchain)
return res;
}
if (PyList_Append(res, op) < 0) {
Py_DECREF(res);
return NULL;
}
op = op->_ob_next;
}
return res;
}
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#endif
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/* Hack to force loading of pycapsule.o */
PyTypeObject *_PyCapsule_hack = &PyCapsule_Type;
/* Hack to force loading of abstract.o */
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Py_ssize_t (*_Py_abstract_hack)(PyObject *) = PyObject_Size;
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/* Python's malloc wrappers (see pymem.h) */
void *
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PyMem_Malloc(size_t nbytes)
{
return PyMem_MALLOC(nbytes);
}
void *
PyMem_Realloc(void *p, size_t nbytes)
{
return PyMem_REALLOC(p, nbytes);
}
void
PyMem_Free(void *p)
{
PyMem_FREE(p);
}
/* These methods are used to control infinite recursion in repr, str, print,
etc. Container objects that may recursively contain themselves,
e.g. builtin dictionaries and lists, should used Py_ReprEnter() and
Py_ReprLeave() to avoid infinite recursion.
Py_ReprEnter() returns 0 the first time it is called for a particular
object and 1 every time thereafter. It returns -1 if an exception
occurred. Py_ReprLeave() has no return value.
See dictobject.c and listobject.c for examples of use.
*/
#define KEY "Py_Repr"
int
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Py_ReprEnter(PyObject *obj)
{
PyObject *dict;
PyObject *list;
Py_ssize_t i;
dict = PyThreadState_GetDict();
if (dict == NULL)
return 0;
list = PyDict_GetItemString(dict, KEY);
if (list == NULL) {
list = PyList_New(0);
if (list == NULL)
return -1;
if (PyDict_SetItemString(dict, KEY, list) < 0)
return -1;
Py_DECREF(list);
}
i = PyList_GET_SIZE(list);
while (--i >= 0) {
if (PyList_GET_ITEM(list, i) == obj)
return 1;
}
PyList_Append(list, obj);
return 0;
}
void
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Py_ReprLeave(PyObject *obj)
{
PyObject *dict;
PyObject *list;
Py_ssize_t i;
dict = PyThreadState_GetDict();
if (dict == NULL)
return;
list = PyDict_GetItemString(dict, KEY);
if (list == NULL || !PyList_Check(list))
return;
i = PyList_GET_SIZE(list);
/* Count backwards because we always expect obj to be list[-1] */
while (--i >= 0) {
if (PyList_GET_ITEM(list, i) == obj) {
PyList_SetSlice(list, i, i + 1, NULL);
break;
}
}
}
/* Trashcan support. */
/* Current call-stack depth of tp_dealloc calls. */
int _PyTrash_delete_nesting = 0;
/* List of objects that still need to be cleaned up, singly linked via their
* gc headers' gc_prev pointers.
*/
PyObject *_PyTrash_delete_later = NULL;
/* Add op to the _PyTrash_delete_later list. Called when the current
* call-stack depth gets large. op must be a currently untracked gc'ed
* object, with refcount 0. Py_DECREF must already have been called on it.
*/
void
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_PyTrash_deposit_object(PyObject *op)
{
assert(PyObject_IS_GC(op));
assert(_Py_AS_GC(op)->gc.gc_refs == _PyGC_REFS_UNTRACKED);
assert(op->ob_refcnt == 0);
_Py_AS_GC(op)->gc.gc_prev = (PyGC_Head *)_PyTrash_delete_later;
_PyTrash_delete_later = op;
}
/* Dealloccate all the objects in the _PyTrash_delete_later list. Called when
* the call-stack unwinds again.
*/
void
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_PyTrash_destroy_chain(void)
{
while (_PyTrash_delete_later) {
PyObject *op = _PyTrash_delete_later;
destructor dealloc = Py_TYPE(op)->tp_dealloc;
_PyTrash_delete_later =
(PyObject*) _Py_AS_GC(op)->gc.gc_prev;
/* Call the deallocator directly. This used to try to
* fool Py_DECREF into calling it indirectly, but
* Py_DECREF was already called on this object, and in
* assorted non-release builds calling Py_DECREF again ends
* up distorting allocation statistics.
*/
assert(op->ob_refcnt == 0);
++_PyTrash_delete_nesting;
(*dealloc)(op);
--_PyTrash_delete_nesting;
}
}
2010-12-03 16:14:31 -04:00
#ifndef Py_TRACE_REFS
/* For Py_LIMITED_API, we need an out-of-line version of _Py_Dealloc.
Define this here, so we can undefine the macro. */
#undef _Py_Dealloc
PyAPI_FUNC(void) _Py_Dealloc(PyObject *);
void
_Py_Dealloc(PyObject *op)
{
_Py_INC_TPFREES(op) _Py_COUNT_ALLOCS_COMMA
(*Py_TYPE(op)->tp_dealloc)(op);
}
#endif
#ifdef __cplusplus
}
#endif