cpython/Objects/object.c

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/* Generic object operations; and implementation of None (NoObject) */
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#include "Python.h"
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#ifdef macintosh
#include "macglue.h"
#endif
/* just for trashcan: */
#include "compile.h"
#include "frameobject.h"
#include "traceback.h"
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#if defined( Py_TRACE_REFS ) || defined( Py_REF_DEBUG )
DL_IMPORT(long) _Py_RefTotal;
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#endif
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Add warning mode for classic division, almost exactly as specified in PEP 238. Changes: - add a new flag variable Py_DivisionWarningFlag, declared in pydebug.h, defined in object.c, set in main.c, and used in {int,long,float,complex}object.c. When this flag is set, the classic division operator issues a DeprecationWarning message. - add a new API PyRun_SimpleStringFlags() to match PyRun_SimpleString(). The main() function calls this so that commands run with -c can also benefit from -Dnew. - While I was at it, I changed the usage message in main() somewhat: alphabetized the options, split it in *four* parts to fit in under 512 bytes (not that I still believe this is necessary -- doc strings elsewhere are much longer), and perhaps most visibly, don't display the full list of options on each command line error. Instead, the full list is only displayed when -h is used, and otherwise a brief reminder of -h is displayed. When -h is used, write to stdout so that you can do `python -h | more'. Notes: - I don't want to use the -W option to control whether the classic division warning is issued or not, because the machinery to decide whether to display the warning or not is very expensive (it involves calling into the warnings.py module). You can use -Werror to turn the warnings into exceptions though. - The -Dnew option doesn't select future division for all of the program -- only for the __main__ module. I don't know if I'll ever change this -- it would require changes to the .pyc file magic number to do it right, and a more global notion of compiler flags. - You can usefully combine -Dwarn and -Dnew: this gives the __main__ module new division, and warns about classic division everywhere else.
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DL_IMPORT(int) Py_DivisionWarningFlag;
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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 COUNT_ALLOCS
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static PyTypeObject *type_list;
extern int tuple_zero_allocs, fast_tuple_allocs;
extern int quick_int_allocs, quick_neg_int_allocs;
extern int null_strings, one_strings;
void
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dump_counts(void)
{
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PyTypeObject *tp;
for (tp = type_list; tp; tp = tp->tp_next)
fprintf(stderr, "%s alloc'd: %d, freed: %d, max in use: %d\n",
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tp->tp_name, tp->tp_allocs, tp->tp_frees,
tp->tp_maxalloc);
fprintf(stderr, "fast tuple allocs: %d, empty: %d\n",
fast_tuple_allocs, tuple_zero_allocs);
fprintf(stderr, "fast int allocs: pos: %d, neg: %d\n",
quick_int_allocs, quick_neg_int_allocs);
fprintf(stderr, "null strings: %d, 1-strings: %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) {
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v = Py_BuildValue("(siii)", 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)
{
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if (tp->tp_allocs == 0) {
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/* first time; insert in linked list */
if (tp->tp_next != NULL) /* sanity check */
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Py_FatalError("XXX inc_count sanity check");
tp->tp_next = type_list;
type_list = tp;
}
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tp->tp_allocs++;
if (tp->tp_allocs - tp->tp_frees > tp->tp_maxalloc)
tp->tp_maxalloc = tp->tp_allocs - tp->tp_frees;
}
#endif
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PyObject *
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PyObject_Init(PyObject *op, PyTypeObject *tp)
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{
if (op == NULL) {
PyErr_SetString(PyExc_SystemError,
"NULL object passed to PyObject_Init");
return op;
}
/* Any changes should be reflected in PyObject_INIT (objimpl.h) */
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op->ob_type = tp;
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_Py_NewReference(op);
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return op;
}
PyVarObject *
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PyObject_InitVar(PyVarObject *op, PyTypeObject *tp, int size)
{
if (op == NULL) {
PyErr_SetString(PyExc_SystemError,
"NULL object passed to PyObject_InitVar");
return op;
}
/* Any changes should be reflected in PyObject_INIT_VAR */
op->ob_size = size;
op->ob_type = 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, int size)
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{
PyVarObject *op;
op = (PyVarObject *) PyObject_MALLOC(_PyObject_VAR_SIZE(tp, size));
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if (op == NULL)
return (PyVarObject *)PyErr_NoMemory();
return PyObject_INIT_VAR(op, tp, size);
}
void
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_PyObject_Del(PyObject *op)
{
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PyObject_FREE(op);
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}
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int
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PyObject_Print(PyObject *op, FILE *fp, int flags)
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{
int ret = 0;
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if (PyErr_CheckSignals())
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return -1;
#ifdef USE_STACKCHECK
if (PyOS_CheckStack()) {
PyErr_SetString(PyExc_MemoryError, "stack overflow");
return -1;
}
#endif
clearerr(fp); /* Clear any previous error condition */
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if (op == NULL) {
fprintf(fp, "<nil>");
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}
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else {
if (op->ob_refcnt <= 0)
fprintf(fp, "<refcnt %u at %p>",
op->ob_refcnt, op);
else if (op->ob_type->tp_print == NULL) {
PyObject *s;
if (flags & Py_PRINT_RAW)
s = PyObject_Str(op);
else
s = PyObject_Repr(op);
if (s == NULL)
ret = -1;
else {
ret = PyObject_Print(s, fp, Py_PRINT_RAW);
}
Py_XDECREF(s);
}
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else
ret = (*op->ob_type->tp_print)(op, fp, flags);
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}
if (ret == 0) {
if (ferror(fp)) {
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PyErr_SetFromErrno(PyExc_IOError);
clearerr(fp);
ret = -1;
}
}
return ret;
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}
/* For debugging convenience. See Misc/gdbinit for some useful gdb hooks */
void _PyObject_Dump(PyObject* op)
{
if (op == NULL)
fprintf(stderr, "NULL\n");
else {
fprintf(stderr, "object : ");
(void)PyObject_Print(op, stderr, 0);
fprintf(stderr, "\n"
"type : %s\n"
"refcount: %d\n"
"address : %p\n",
op->ob_type==NULL ? "NULL" : op->ob_type->tp_name,
op->ob_refcnt,
op);
}
}
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PyObject *
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PyObject_Repr(PyObject *v)
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{
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if (PyErr_CheckSignals())
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return NULL;
#ifdef USE_STACKCHECK
if (PyOS_CheckStack()) {
PyErr_SetString(PyExc_MemoryError, "stack overflow");
return NULL;
}
#endif
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if (v == NULL)
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return PyString_FromString("<NULL>");
else if (v->ob_type->tp_repr == NULL)
return PyString_FromFormat("<%s object at %p>",
v->ob_type->tp_name, v);
else {
PyObject *res;
res = (*v->ob_type->tp_repr)(v);
if (res == NULL)
return NULL;
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(res)) {
PyObject* str;
str = PyUnicode_AsUnicodeEscapeString(res);
Py_DECREF(res);
if (str)
res = str;
else
return NULL;
}
#endif
if (!PyString_Check(res)) {
PyErr_Format(PyExc_TypeError,
"__repr__ returned non-string (type %.200s)",
res->ob_type->tp_name);
Py_DECREF(res);
return NULL;
}
return res;
}
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}
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PyObject *
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PyObject_Str(PyObject *v)
{
PyObject *res;
if (v == NULL)
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return PyString_FromString("<NULL>");
if (PyString_CheckExact(v)) {
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Py_INCREF(v);
return v;
}
if (PyString_Check(v)) {
/* For a string subtype that's not a string, return a true
string with the same string data. */
PyStringObject *s = (PyStringObject *)v;
return PyString_FromStringAndSize(s->ob_sval, s->ob_size);
}
if (v->ob_type->tp_str == NULL)
return PyObject_Repr(v);
res = (*v->ob_type->tp_str)(v);
if (res == NULL)
return NULL;
#ifdef Py_USING_UNICODE
if (PyUnicode_Check(res)) {
PyObject* str;
str = PyUnicode_AsEncodedString(res, NULL, NULL);
Py_DECREF(res);
if (str)
res = str;
else
return NULL;
}
#endif
if (!PyString_Check(res)) {
PyErr_Format(PyExc_TypeError,
"__str__ returned non-string (type %.200s)",
res->ob_type->tp_name);
Py_DECREF(res);
return NULL;
}
return res;
}
#ifdef Py_USING_UNICODE
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_Unicode(PyObject *v)
{
PyObject *res;
if (v == NULL)
res = PyString_FromString("<NULL>");
else if (PyUnicode_Check(v)) {
Py_INCREF(v);
return v;
}
else if (PyString_Check(v)) {
Py_INCREF(v);
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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res = v;
}
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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else if (v->ob_type->tp_str != NULL)
res = (*v->ob_type->tp_str)(v);
else {
PyObject *func;
static PyObject *strstr;
if (strstr == NULL) {
strstr= PyString_InternFromString("__str__");
if (strstr == NULL)
return NULL;
}
if (!PyInstance_Check(v) ||
(func = PyObject_GetAttr(v, strstr)) == NULL) {
PyErr_Clear();
res = PyObject_Repr(v);
}
else {
res = PyEval_CallObject(func, (PyObject *)NULL);
Py_DECREF(func);
}
}
if (res == NULL)
return NULL;
if (!PyUnicode_Check(res)) {
PyObject* str;
str = PyUnicode_FromObject(res);
Py_DECREF(res);
if (str)
res = str;
else
return NULL;
}
return res;
}
#endif
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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/* Macro to get the tp_richcompare field of a type if defined */
#define RICHCOMPARE(t) (PyType_HasFeature((t), Py_TPFLAGS_HAVE_RICHCOMPARE) \
? (t)->tp_richcompare : NULL)
/* Map rich comparison operators to their swapped version, e.g. LT --> GT */
static int swapped_op[] = {Py_GT, Py_GE, Py_EQ, Py_NE, Py_LT, Py_LE};
/* Try a genuine rich comparison, returning an object. Return:
NULL for exception;
NotImplemented if this particular rich comparison is not implemented or
undefined;
some object not equal to NotImplemented if it is implemented
(this latter object may not be a Boolean).
*/
static PyObject *
try_rich_compare(PyObject *v, PyObject *w, int op)
{
richcmpfunc f;
PyObject *res;
if ((f = RICHCOMPARE(v->ob_type)) != NULL) {
res = (*f)(v, w, op);
if (res != Py_NotImplemented)
return res;
Py_DECREF(res);
}
if ((f = RICHCOMPARE(w->ob_type)) != NULL) {
return (*f)(w, v, swapped_op[op]);
}
res = Py_NotImplemented;
Py_INCREF(res);
return res;
}
/* Try a genuine rich comparison, returning an int. Return:
-1 for exception (including the case where try_rich_compare() returns an
object that's not a Boolean);
0 if the outcome is false;
1 if the outcome is true;
2 if this particular rich comparison is not implemented or undefined.
*/
static int
try_rich_compare_bool(PyObject *v, PyObject *w, int op)
{
PyObject *res;
int ok;
if (RICHCOMPARE(v->ob_type) == NULL && RICHCOMPARE(w->ob_type) == NULL)
return 2; /* Shortcut, avoid INCREF+DECREF */
res = try_rich_compare(v, w, op);
if (res == NULL)
return -1;
if (res == Py_NotImplemented) {
Py_DECREF(res);
return 2;
}
ok = PyObject_IsTrue(res);
Py_DECREF(res);
return ok;
}
/* Try rich comparisons to determine a 3-way comparison. Return:
-2 for an exception;
-1 if v < w;
0 if v == w;
1 if v > w;
2 if this particular rich comparison is not implemented or undefined.
*/
static int
try_rich_to_3way_compare(PyObject *v, PyObject *w)
{
static struct { int op; int outcome; } tries[3] = {
/* Try this operator, and if it is true, use this outcome: */
{Py_EQ, 0},
{Py_LT, -1},
{Py_GT, 1},
};
int i;
if (RICHCOMPARE(v->ob_type) == NULL && RICHCOMPARE(w->ob_type) == NULL)
return 2; /* Shortcut */
for (i = 0; i < 3; i++) {
switch (try_rich_compare_bool(v, w, tries[i].op)) {
case -1:
return -2;
case 1:
return tries[i].outcome;
}
}
return 2;
}
/* Try a 3-way comparison, returning an int. Return:
-2 for an exception;
-1 if v < w;
0 if v == w;
1 if v > w;
2 if this particular 3-way comparison is not implemented or undefined.
*/
static int
try_3way_compare(PyObject *v, PyObject *w)
{
int c;
cmpfunc f;
/* Comparisons involving instances are given to instance_compare,
which has the same return conventions as this function. */
f = v->ob_type->tp_compare;
if (PyInstance_Check(v))
return (*f)(v, w);
if (PyInstance_Check(w))
return (*w->ob_type->tp_compare)(v, w);
/* If both have the same (non-NULL) tp_compare, use it. */
if (f != NULL && f == w->ob_type->tp_compare) {
c = (*f)(v, w);
if (c < 0 && PyErr_Occurred())
return -1;
return c < 0 ? -1 : c > 0 ? 1 : 0;
}
/* If either tp_compare is _PyObject_SlotCompare, that's safe. */
if (f == _PyObject_SlotCompare ||
w->ob_type->tp_compare == _PyObject_SlotCompare)
return _PyObject_SlotCompare(v, w);
/* Try coercion; if it fails, give up */
c = PyNumber_CoerceEx(&v, &w);
if (c < 0)
return -2;
if (c > 0)
return 2;
/* Try v's comparison, if defined */
if ((f = v->ob_type->tp_compare) != NULL) {
c = (*f)(v, w);
Py_DECREF(v);
Py_DECREF(w);
if (c < 0 && PyErr_Occurred())
return -2;
return c < 0 ? -1 : c > 0 ? 1 : 0;
}
/* Try w's comparison, if defined */
if ((f = w->ob_type->tp_compare) != NULL) {
c = (*f)(w, v); /* swapped! */
Py_DECREF(v);
Py_DECREF(w);
if (c < 0 && PyErr_Occurred())
return -2;
return c < 0 ? 1 : c > 0 ? -1 : 0; /* negated! */
}
/* No comparison defined */
Py_DECREF(v);
Py_DECREF(w);
return 2;
}
/* Final fallback 3-way comparison, returning an int. Return:
-2 if an error occurred;
-1 if v < w;
0 if v == w;
1 if v > w.
*/
static int
default_3way_compare(PyObject *v, PyObject *w)
{
int c;
char *vname, *wname;
if (v->ob_type == w->ob_type) {
/* When comparing these pointers, they must be cast to
* integer types (i.e. Py_uintptr_t, our spelling of C9X's
* uintptr_t). ANSI specifies that pointer compares other
* than == and != to non-related structures are undefined.
*/
Py_uintptr_t vv = (Py_uintptr_t)v;
Py_uintptr_t ww = (Py_uintptr_t)w;
return (vv < ww) ? -1 : (vv > ww) ? 1 : 0;
}
#ifdef Py_USING_UNICODE
/* Special case for Unicode */
if (PyUnicode_Check(v) || PyUnicode_Check(w)) {
c = PyUnicode_Compare(v, w);
if (!PyErr_Occurred())
return c;
/* TypeErrors are ignored: if Unicode coercion fails due
to one of the arguments not having the right type, we
continue as defined by the coercion protocol (see
above). Luckily, decoding errors are reported as
ValueErrors and are not masked by this technique. */
if (!PyErr_ExceptionMatches(PyExc_TypeError))
return -2;
PyErr_Clear();
}
#endif
/* None is smaller than anything */
if (v == Py_None)
return -1;
if (w == Py_None)
return 1;
/* different type: compare type names */
if (v->ob_type->tp_as_number)
vname = "";
else
vname = v->ob_type->tp_name;
if (w->ob_type->tp_as_number)
wname = "";
else
wname = w->ob_type->tp_name;
c = strcmp(vname, wname);
if (c < 0)
return -1;
if (c > 0)
return 1;
/* Same type name, or (more likely) incomparable numeric types */
return ((Py_uintptr_t)(v->ob_type) < (
Py_uintptr_t)(w->ob_type)) ? -1 : 1;
}
#define CHECK_TYPES(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_CHECKTYPES)
/* Do a 3-way comparison, by hook or by crook. Return:
-2 for an exception;
-1 if v < w;
0 if v == w;
1 if v > w;
If the object implements a tp_compare function, it returns
whatever this function returns (whether with an exception or not).
*/
static int
do_cmp(PyObject *v, PyObject *w)
{
int c;
cmpfunc f;
if (v->ob_type == w->ob_type
&& (f = v->ob_type->tp_compare) != NULL) {
c = (*f)(v, w);
if (c != 2 || !PyInstance_Check(v))
return c;
}
c = try_rich_to_3way_compare(v, w);
if (c < 2)
return c;
c = try_3way_compare(v, w);
if (c < 2)
return c;
return default_3way_compare(v, w);
}
/* compare_nesting is incremented before calling compare (for
some types) and decremented on exit. If the count exceeds the
nesting limit, enable code to detect circular data structures.
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...
2001-01-18 18:07:06 -04:00
This is a tunable parameter that should only affect the performance
of comparisons, nothing else. Setting it high makes comparing deeply
nested non-cyclical data structures faster, but makes comparing cyclical
data structures slower.
*/
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...
2001-01-18 18:07:06 -04:00
#define NESTING_LIMIT 20
static int compare_nesting = 0;
static PyObject*
2000-07-09 12:48:49 -03:00
get_inprogress_dict(void)
{
static PyObject *key;
PyObject *tstate_dict, *inprogress;
if (key == NULL) {
key = PyString_InternFromString("cmp_state");
if (key == NULL)
return NULL;
}
tstate_dict = PyThreadState_GetDict();
if (tstate_dict == NULL) {
PyErr_BadInternalCall();
return NULL;
}
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...
2001-01-18 18:07:06 -04:00
inprogress = PyDict_GetItem(tstate_dict, key);
if (inprogress == NULL) {
inprogress = PyDict_New();
if (inprogress == NULL)
return NULL;
if (PyDict_SetItem(tstate_dict, key, inprogress) == -1) {
Py_DECREF(inprogress);
return NULL;
}
Py_DECREF(inprogress);
}
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...
2001-01-18 18:07:06 -04:00
return inprogress;
}
static PyObject *
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...
2001-01-18 18:07:06 -04:00
check_recursion(PyObject *v, PyObject *w, int op)
{
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...
2001-01-18 18:07:06 -04:00
PyObject *inprogress;
PyObject *token;
Py_uintptr_t iv = (Py_uintptr_t)v;
Py_uintptr_t iw = (Py_uintptr_t)w;
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...
2001-01-18 18:07:06 -04:00
PyObject *x, *y, *z;
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...
2001-01-18 18:07:06 -04:00
inprogress = get_inprogress_dict();
if (inprogress == NULL)
return NULL;
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...
2001-01-18 18:07:06 -04:00
token = PyTuple_New(3);
if (token == NULL)
return NULL;
if (iv <= iw) {
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...
2001-01-18 18:07:06 -04:00
PyTuple_SET_ITEM(token, 0, x = PyLong_FromVoidPtr((void *)v));
PyTuple_SET_ITEM(token, 1, y = PyLong_FromVoidPtr((void *)w));
if (op >= 0)
op = swapped_op[op];
} else {
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...
2001-01-18 18:07:06 -04:00
PyTuple_SET_ITEM(token, 0, x = PyLong_FromVoidPtr((void *)w));
PyTuple_SET_ITEM(token, 1, y = PyLong_FromVoidPtr((void *)v));
}
PyTuple_SET_ITEM(token, 2, z = PyInt_FromLong((long)op));
if (x == NULL || y == NULL || z == NULL) {
Py_DECREF(token);
return NULL;
}
if (PyDict_GetItem(inprogress, token) != NULL) {
Py_DECREF(token);
return Py_None; /* Without INCREF! */
}
if (PyDict_SetItem(inprogress, token, token) < 0) {
Py_DECREF(token);
return NULL;
}
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...
2001-01-18 18:07:06 -04:00
return token;
}
static void
delete_token(PyObject *token)
{
PyObject *inprogress;
if (token == NULL || token == Py_None)
return;
inprogress = get_inprogress_dict();
if (inprogress == NULL)
PyErr_Clear();
else
PyDict_DelItem(inprogress, token);
Py_DECREF(token);
}
1990-10-14 09:07:46 -03:00
int
2000-07-09 12:48:49 -03:00
PyObject_Compare(PyObject *v, PyObject *w)
1990-10-14 09:07:46 -03:00
{
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...
2001-01-18 18:07:06 -04:00
PyTypeObject *vtp;
int result;
#if defined(USE_STACKCHECK)
if (PyOS_CheckStack()) {
PyErr_SetString(PyExc_MemoryError, "Stack overflow");
return -1;
}
#endif
if (v == NULL || w == NULL) {
PyErr_BadInternalCall();
return -1;
}
1990-10-14 09:07:46 -03:00
if (v == w)
return 0;
vtp = v->ob_type;
compare_nesting++;
if (compare_nesting > NESTING_LIMIT &&
(vtp->tp_as_mapping
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...
2001-01-18 18:07:06 -04:00
|| (vtp->tp_as_sequence
&& !PyString_Check(v)
&& !PyTuple_Check(v)))) {
/* try to detect circular data structures */
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...
2001-01-18 18:07:06 -04:00
PyObject *token = check_recursion(v, w, -1);
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...
2001-01-18 18:07:06 -04:00
if (token == NULL) {
result = -1;
}
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...
2001-01-18 18:07:06 -04:00
else if (token == Py_None) {
/* already comparing these objects. assume
they're equal until shown otherwise */
result = 0;
}
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...
2001-01-18 18:07:06 -04:00
else {
result = do_cmp(v, w);
delete_token(token);
}
}
else {
result = do_cmp(v, w);
}
compare_nesting--;
return result < 0 ? -1 : result;
}
static PyObject *
convert_3way_to_object(int op, int c)
{
PyObject *result;
switch (op) {
case Py_LT: c = c < 0; break;
case Py_LE: c = c <= 0; break;
case Py_EQ: c = c == 0; break;
case Py_NE: c = c != 0; break;
case Py_GT: c = c > 0; break;
case Py_GE: c = c >= 0; break;
}
result = c ? Py_True : Py_False;
Py_INCREF(result);
return result;
1990-10-14 09:07:46 -03:00
}
static PyObject *
try_3way_to_rich_compare(PyObject *v, PyObject *w, int op)
{
int c;
c = try_3way_compare(v, w);
if (c >= 2)
c = default_3way_compare(v, w);
if (c <= -2)
return NULL;
return convert_3way_to_object(op, c);
}
1990-10-14 09:07:46 -03:00
2001-01-21 12:25:18 -04:00
static PyObject *
do_richcmp(PyObject *v, PyObject *w, int op)
{
PyObject *res;
cmpfunc f;
/* If the types are equal, don't bother with coercions etc.
Instances are special-cased in try_3way_compare, since
a result of 2 does *not* mean one value being greater
than the other. */
if (v->ob_type == w->ob_type
&& (f = v->ob_type->tp_compare) != NULL
&& !PyInstance_Check(v)) {
int c;
richcmpfunc f1;
if ((f1 = RICHCOMPARE(v->ob_type)) != NULL) {
/* If the type has richcmp, try it first.
try_rich_compare would try it two-sided,
which is not needed since we've a single
type only. */
res = (*f1)(v, w, op);
if (res != Py_NotImplemented)
return res;
Py_DECREF(res);
}
c = (*f)(v, w);
if (c < 0 && PyErr_Occurred())
return NULL;
return convert_3way_to_object(op, c);
}
res = try_rich_compare(v, w, op);
if (res != Py_NotImplemented)
return res;
Py_DECREF(res);
return try_3way_to_rich_compare(v, w, op);
}
PyObject *
PyObject_RichCompare(PyObject *v, PyObject *w, int op)
{
PyObject *res;
assert(Py_LT <= op && op <= Py_GE);
compare_nesting++;
if (compare_nesting > NESTING_LIMIT &&
(v->ob_type->tp_as_mapping
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...
2001-01-18 18:07:06 -04:00
|| (v->ob_type->tp_as_sequence
&& !PyString_Check(v)
&& !PyTuple_Check(v)))) {
/* try to detect circular data structures */
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...
2001-01-18 18:07:06 -04:00
PyObject *token = check_recursion(v, w, op);
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...
2001-01-18 18:07:06 -04:00
if (token == NULL) {
res = NULL;
}
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...
2001-01-18 18:07:06 -04:00
else if (token == Py_None) {
/* already comparing these objects with this operator.
assume they're equal until shown otherwise */
if (op == Py_EQ)
res = Py_True;
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...
2001-01-18 18:07:06 -04:00
else if (op == Py_NE)
res = Py_False;
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...
2001-01-18 18:07:06 -04:00
else {
PyErr_SetString(PyExc_ValueError,
"can't order recursive values");
res = NULL;
}
Py_XINCREF(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...
2001-01-18 18:07:06 -04:00
else {
res = do_richcmp(v, w, op);
delete_token(token);
}
}
else {
res = do_richcmp(v, w, op);
}
compare_nesting--;
return res;
}
/* Return -1 if error; 1 if v op w; 0 if not (v op w). */
int
PyObject_RichCompareBool(PyObject *v, PyObject *w, int op)
{
PyObject *res = PyObject_RichCompare(v, w, op);
int ok;
if (res == NULL)
return -1;
ok = PyObject_IsTrue(res);
Py_DECREF(res);
return ok;
}
/* Set of hash utility functions to help maintaining the invariant that
iff a==b then hash(a)==hash(b)
All the utility functions (_Py_Hash*()) return "-1" to signify an error.
*/
long
2000-07-09 12:48:49 -03:00
_Py_HashDouble(double v)
{
double intpart, fractpart;
int expo;
long hipart;
long x; /* the final hash value */
/* This is designed so that Python numbers of different types
* that compare equal hash to the same value; otherwise comparisons
* of mapping keys will turn out weird.
*/
#ifdef MPW /* MPW C modf expects pointer to extended as second argument */
{
extended e;
fractpart = modf(v, &e);
intpart = e;
}
#else
fractpart = modf(v, &intpart);
#endif
if (fractpart == 0.0) {
/* This must return the same hash as an equal int or long. */
if (intpart > LONG_MAX || -intpart > LONG_MAX) {
/* Convert to long and use its hash. */
PyObject *plong; /* converted to Python long */
if (Py_IS_INFINITY(intpart))
/* can't convert to long int -- arbitrary */
v = v < 0 ? -271828.0 : 314159.0;
plong = PyLong_FromDouble(v);
if (plong == NULL)
return -1;
x = PyObject_Hash(plong);
Py_DECREF(plong);
return x;
}
/* Fits in a C long == a Python int, so is its own hash. */
x = (long)intpart;
if (x == -1)
x = -2;
return x;
}
/* The fractional part is non-zero, so we don't have to worry about
* making this match the hash of some other type.
* Use frexp to get at the bits in the double.
* Since the VAX D double format has 56 mantissa bits, which is the
* most of any double format in use, each of these parts may have as
* many as (but no more than) 56 significant bits.
* So, assuming sizeof(long) >= 4, each part can be broken into two
* longs; frexp and multiplication are used to do that.
* Also, since the Cray double format has 15 exponent bits, which is
* the most of any double format in use, shifting the exponent field
* left by 15 won't overflow a long (again assuming sizeof(long) >= 4).
*/
v = frexp(v, &expo);
v *= 2147483648.0; /* 2**31 */
hipart = (long)v; /* take the top 32 bits */
v = (v - (double)hipart) * 2147483648.0; /* get the next 32 bits */
x = hipart + (long)v + (expo << 15);
if (x == -1)
x = -2;
return x;
}
long
2000-07-09 12:48:49 -03:00
_Py_HashPointer(void *p)
{
#if SIZEOF_LONG >= SIZEOF_VOID_P
return (long)p;
#else
/* convert to a Python long and hash that */
PyObject* longobj;
long x;
if ((longobj = PyLong_FromVoidPtr(p)) == NULL) {
x = -1;
goto finally;
}
x = PyObject_Hash(longobj);
finally:
Py_XDECREF(longobj);
return x;
#endif
}
long
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PyObject_Hash(PyObject *v)
{
1997-05-02 00:12:38 -03:00
PyTypeObject *tp = v->ob_type;
if (tp->tp_hash != NULL)
return (*tp->tp_hash)(v);
if (tp->tp_compare == NULL && RICHCOMPARE(tp) == NULL) {
return _Py_HashPointer(v); /* Use address as hash value */
}
/* If there's a cmp but no hash defined, the object can't be hashed */
1997-05-02 00:12:38 -03:00
PyErr_SetString(PyExc_TypeError, "unhashable type");
return -1;
}
1997-05-02 00:12:38 -03:00
PyObject *
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PyObject_GetAttrString(PyObject *v, char *name)
1990-12-20 11:06:42 -04:00
{
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PyObject *w, *res;
2001-08-02 01:15:00 -03:00
if (v->ob_type->tp_getattr != NULL)
1990-12-20 11:06:42 -04:00
return (*v->ob_type->tp_getattr)(v, name);
2001-08-02 01:15:00 -03:00
w = PyString_InternFromString(name);
if (w == NULL)
return NULL;
res = PyObject_GetAttr(v, w);
Py_XDECREF(w);
return res;
1990-12-20 11:06:42 -04:00
}
int
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PyObject_HasAttrString(PyObject *v, char *name)
{
1997-05-02 00:12:38 -03:00
PyObject *res = PyObject_GetAttrString(v, name);
if (res != NULL) {
1997-05-02 00:12:38 -03:00
Py_DECREF(res);
return 1;
}
1997-05-02 00:12:38 -03:00
PyErr_Clear();
return 0;
}
1990-12-20 11:06:42 -04:00
int
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PyObject_SetAttrString(PyObject *v, char *name, PyObject *w)
1990-12-20 11:06:42 -04:00
{
2001-08-02 01:15:00 -03:00
PyObject *s;
int res;
2001-08-02 01:15:00 -03:00
if (v->ob_type->tp_setattr != NULL)
1990-12-20 11:06:42 -04:00
return (*v->ob_type->tp_setattr)(v, name, w);
2001-08-02 01:15:00 -03:00
s = PyString_InternFromString(name);
if (s == NULL)
return -1;
res = PyObject_SetAttr(v, s, w);
Py_XDECREF(s);
return res;
}
PyObject *
2000-07-09 12:48:49 -03:00
PyObject_GetAttr(PyObject *v, PyObject *name)
{
2001-08-02 01:15:00 -03:00
PyTypeObject *tp = v->ob_type;
#ifdef Py_USING_UNICODE
/* The Unicode to string conversion is done here because the
existing tp_getattro slots expect a string object as name
and we wouldn't want to break those. */
if (PyUnicode_Check(name)) {
name = _PyUnicode_AsDefaultEncodedString(name, NULL);
if (name == NULL)
return NULL;
}
#endif
if (!PyString_Check(name)) {
PyErr_SetString(PyExc_TypeError,
"attribute name must be string");
return NULL;
}
2001-08-02 01:15:00 -03:00
if (tp->tp_getattro != NULL)
return (*tp->tp_getattro)(v, name);
if (tp->tp_getattr != NULL)
return (*tp->tp_getattr)(v, PyString_AS_STRING(name));
PyErr_Format(PyExc_AttributeError,
"'%.50s' object has no attribute '%.400s'",
tp->tp_name, PyString_AS_STRING(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)
{
2001-08-02 01:15:00 -03:00
PyTypeObject *tp = v->ob_type;
int err;
#ifdef Py_USING_UNICODE
/* The Unicode to string conversion is done here because the
existing tp_setattro slots expect a string object as name
and we wouldn't want to break those. */
if (PyUnicode_Check(name)) {
name = PyUnicode_AsEncodedString(name, NULL, NULL);
if (name == NULL)
return -1;
}
else
#endif
if (!PyString_Check(name)){
PyErr_SetString(PyExc_TypeError,
"attribute name must be string");
2001-08-02 01:15:00 -03:00
return -1;
}
2001-08-02 01:15:00 -03:00
else
Py_INCREF(name);
PyString_InternInPlace(&name);
if (tp->tp_setattro != NULL) {
err = (*tp->tp_setattro)(v, name, value);
Py_DECREF(name);
return err;
}
if (tp->tp_setattr != NULL) {
err = (*tp->tp_setattr)(v, PyString_AS_STRING(name), value);
Py_DECREF(name);
return err;
}
Py_DECREF(name);
2001-08-02 01:15:00 -03:00
if (tp->tp_getattr == NULL && tp->tp_getattro == NULL)
PyErr_Format(PyExc_TypeError,
"'%.100s' object has no attributes "
"(%s .%.100s)",
tp->tp_name,
value==NULL ? "del" : "assign to",
PyString_AS_STRING(name));
else
PyErr_Format(PyExc_TypeError,
"'%.100s' object has only read-only attributes "
"(%s .%.100s)",
tp->tp_name,
value==NULL ? "del" : "assign to",
PyString_AS_STRING(name));
return -1;
}
/* Helper to get a pointer to an object's __dict__ slot, if any */
PyObject **
_PyObject_GetDictPtr(PyObject *obj)
{
#define PTRSIZE (sizeof(PyObject *))
long dictoffset;
PyTypeObject *tp = obj->ob_type;
if (!(tp->tp_flags & Py_TPFLAGS_HAVE_CLASS))
return NULL;
dictoffset = tp->tp_dictoffset;
if (dictoffset == 0)
return NULL;
if (dictoffset < 0) {
dictoffset += tp->tp_basicsize;
2001-08-02 01:15:00 -03:00
assert(dictoffset > 0); /* Sanity check */
if (tp->tp_itemsize > 0) {
int n = ((PyVarObject *)obj)->ob_size;
if (n > 0) {
dictoffset += tp->tp_itemsize * n;
/* Round up, if necessary */
if (tp->tp_itemsize % PTRSIZE != 0) {
dictoffset += PTRSIZE - 1;
dictoffset /= PTRSIZE;
dictoffset *= PTRSIZE;
}
}
}
}
return (PyObject **) ((char *)obj + dictoffset);
}
/* Generic GetAttr functions - put these in your tp_[gs]etattro slot */
PyObject *
PyObject_GenericGetAttr(PyObject *obj, PyObject *name)
{
PyTypeObject *tp = obj->ob_type;
PyObject *descr;
descrgetfunc f;
PyObject **dictptr;
if (tp->tp_dict == NULL) {
if (PyType_Ready(tp) < 0)
2001-08-02 01:15:00 -03:00
return NULL;
}
descr = _PyType_Lookup(tp, name);
f = NULL;
if (descr != NULL) {
f = descr->ob_type->tp_descr_get;
if (f != NULL && PyDescr_IsData(descr))
return f(descr, obj, (PyObject *)obj->ob_type);
}
dictptr = _PyObject_GetDictPtr(obj);
if (dictptr != NULL) {
PyObject *dict = *dictptr;
if (dict != NULL) {
PyObject *res = PyDict_GetItem(dict, name);
if (res != NULL) {
Py_INCREF(res);
return res;
}
}
}
if (f != NULL)
return f(descr, obj, (PyObject *)obj->ob_type);
if (descr != NULL) {
Py_INCREF(descr);
return descr;
}
PyErr_Format(PyExc_AttributeError,
"'%.50s' object has no attribute '%.400s'",
tp->tp_name, PyString_AS_STRING(name));
return NULL;
}
int
PyObject_GenericSetAttr(PyObject *obj, PyObject *name, PyObject *value)
{
PyTypeObject *tp = obj->ob_type;
PyObject *descr;
descrsetfunc f;
PyObject **dictptr;
if (tp->tp_dict == NULL) {
if (PyType_Ready(tp) < 0)
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return -1;
}
descr = _PyType_Lookup(tp, name);
f = NULL;
if (descr != NULL) {
f = descr->ob_type->tp_descr_set;
if (f != NULL && PyDescr_IsData(descr))
return f(descr, obj, value);
}
dictptr = _PyObject_GetDictPtr(obj);
if (dictptr != NULL) {
PyObject *dict = *dictptr;
if (dict == NULL && value != NULL) {
dict = PyDict_New();
if (dict == NULL)
return -1;
*dictptr = dict;
}
if (dict != NULL) {
int res;
if (value == NULL)
res = PyDict_DelItem(dict, name);
else
res = PyDict_SetItem(dict, name, value);
if (res < 0 && PyErr_ExceptionMatches(PyExc_KeyError))
PyErr_SetObject(PyExc_AttributeError, name);
return res;
}
}
if (f != NULL)
return f(descr, obj, value);
if (descr == NULL) {
PyErr_Format(PyExc_AttributeError,
"'%.50s' object has no attribute '%.400s'",
tp->tp_name, PyString_AS_STRING(name));
return -1;
}
PyErr_Format(PyExc_AttributeError,
"'%.50s' object attribute '%.400s' is read-only",
tp->tp_name, PyString_AS_STRING(name));
return -1;
}
/* Test a value used as condition, e.g., in a for or if statement.
Return -1 if an error occurred */
int
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PyObject_IsTrue(PyObject *v)
{
int res;
1997-05-02 00:12:38 -03:00
if (v == Py_None)
res = 0;
else if (v->ob_type->tp_as_number != NULL &&
v->ob_type->tp_as_number->nb_nonzero != NULL)
res = (*v->ob_type->tp_as_number->nb_nonzero)(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
res = 1;
if (res > 0)
res = 1;
return res;
1990-12-20 11:06:42 -04:00
}
1998-04-09 14:53:59 -03:00
/* equivalent of 'not v'
Return -1 if an error occurred */
int
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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;
}
/* Coerce two numeric types to the "larger" one.
Increment the reference count on each argument.
Return value:
-1 if an error occurred;
0 if the coercion succeeded (and then the reference counts are increased);
1 if no coercion is possible (and no error is raised).
*/
int
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PyNumber_CoerceEx(PyObject **pv, PyObject **pw)
{
1997-05-02 00:12:38 -03:00
register PyObject *v = *pv;
register PyObject *w = *pw;
int res;
1997-05-02 00:12:38 -03:00
if (v->ob_type == w->ob_type && !PyInstance_Check(v)) {
Py_INCREF(v);
Py_INCREF(w);
return 0;
}
if (v->ob_type->tp_as_number && v->ob_type->tp_as_number->nb_coerce) {
res = (*v->ob_type->tp_as_number->nb_coerce)(pv, pw);
if (res <= 0)
return res;
}
if (w->ob_type->tp_as_number && w->ob_type->tp_as_number->nb_coerce) {
res = (*w->ob_type->tp_as_number->nb_coerce)(pw, pv);
if (res <= 0)
return res;
}
return 1;
}
/* Coerce two numeric types to the "larger" one.
Increment the reference count on each argument.
Return -1 and raise an exception if no coercion is possible
(and then no reference count is incremented).
*/
int
2000-07-09 12:48:49 -03:00
PyNumber_Coerce(PyObject **pv, PyObject **pw)
{
int err = PyNumber_CoerceEx(pv, pw);
if (err <= 0)
return err;
1997-05-02 00:12:38 -03:00
PyErr_SetString(PyExc_TypeError, "number coercion failed");
return -1;
}
1990-10-14 09:07:46 -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;
1997-05-02 00:12:38 -03:00
if (PyInstance_Check(x)) {
PyObject *call = PyObject_GetAttrString(x, "__call__");
1995-01-25 20:38:22 -04:00
if (call == NULL) {
1997-05-02 00:12:38 -03:00
PyErr_Clear();
1995-01-25 20:38:22 -04:00
return 0;
}
/* Could test recursively but don't, for fear of endless
recursion if some joker sets self.__call__ = self */
1997-05-02 00:12:38 -03:00
Py_DECREF(call);
1995-01-25 20:38:22 -04:00
return 1;
}
2001-08-02 01:15:00 -03:00
else {
return x->ob_type->tp_call != NULL;
}
1995-01-25 20:38:22 -04:00
}
/* Helper for PyObject_Dir.
Merge the __dict__ of aclass into dict, and recursively also all
the __dict__s of aclass's base classes. The order of merging isn't
defined, as it's expected that only the final set of dict keys is
interesting.
Return 0 on success, -1 on error.
*/
static int
merge_class_dict(PyObject* dict, PyObject* aclass)
{
PyObject *classdict;
PyObject *bases;
assert(PyDict_Check(dict));
assert(aclass);
/* Merge in the type's dict (if any). */
classdict = PyObject_GetAttrString(aclass, "__dict__");
if (classdict == NULL)
PyErr_Clear();
else {
int status = PyDict_Update(dict, classdict);
Py_DECREF(classdict);
if (status < 0)
return -1;
}
/* Recursively merge in the base types' (if any) dicts. */
bases = PyObject_GetAttrString(aclass, "__bases__");
if (bases == NULL)
PyErr_Clear();
else {
int i, n;
assert(PyTuple_Check(bases));
n = PyTuple_GET_SIZE(bases);
for (i = 0; i < n; i++) {
PyObject *base = PyTuple_GET_ITEM(bases, i);
if (merge_class_dict(dict, base) < 0) {
Py_DECREF(bases);
return -1;
}
}
Py_DECREF(bases);
}
return 0;
}
/* Helper for PyObject_Dir.
If obj has an attr named attrname that's a list, merge its string
elements into keys of dict.
Return 0 on success, -1 on error. Errors due to not finding the attr,
or the attr not being a list, are suppressed.
*/
static int
merge_list_attr(PyObject* dict, PyObject* obj, char *attrname)
{
PyObject *list;
int result = 0;
assert(PyDict_Check(dict));
assert(obj);
assert(attrname);
list = PyObject_GetAttrString(obj, attrname);
if (list == NULL)
PyErr_Clear();
else if (PyList_Check(list)) {
int i;
for (i = 0; i < PyList_GET_SIZE(list); ++i) {
PyObject *item = PyList_GET_ITEM(list, i);
if (PyString_Check(item)) {
result = PyDict_SetItem(dict, item, Py_None);
if (result < 0)
break;
}
}
}
Py_XDECREF(list);
return result;
}
/* Like __builtin__.dir(arg). See bltinmodule.c's builtin_dir for the
docstring, which should be kept in synch with this implementation. */
PyObject *
PyObject_Dir(PyObject *arg)
{
/* Set exactly one of these non-NULL before the end. */
PyObject *result = NULL; /* result list */
PyObject *masterdict = NULL; /* result is masterdict.keys() */
/* If NULL arg, return the locals. */
if (arg == NULL) {
PyObject *locals = PyEval_GetLocals();
if (locals == NULL)
goto error;
result = PyDict_Keys(locals);
if (result == NULL)
goto error;
}
/* Elif this is some form of module, we only want its dict. */
else if (PyModule_Check(arg)) {
masterdict = PyObject_GetAttrString(arg, "__dict__");
if (masterdict == NULL)
goto error;
if (!PyDict_Check(masterdict)) {
PyErr_SetString(PyExc_TypeError,
"module.__dict__ is not a dictionary");
goto error;
}
}
/* Elif some form of type or class, grab its dict and its bases.
We deliberately don't suck up its __class__, as methods belonging
to the metaclass would probably be more confusing than helpful. */
else if (PyType_Check(arg) || PyClass_Check(arg)) {
masterdict = PyDict_New();
if (masterdict == NULL)
goto error;
if (merge_class_dict(masterdict, arg) < 0)
goto error;
}
/* Else look at its dict, and the attrs reachable from its class. */
else {
PyObject *itsclass;
/* Create a dict to start with. CAUTION: Not everything
responding to __dict__ returns a dict! */
masterdict = PyObject_GetAttrString(arg, "__dict__");
if (masterdict == NULL) {
PyErr_Clear();
masterdict = PyDict_New();
}
else if (!PyDict_Check(masterdict)) {
Py_DECREF(masterdict);
masterdict = PyDict_New();
}
else {
/* The object may have returned a reference to its
dict, so copy it to avoid mutating it. */
PyObject *temp = PyDict_Copy(masterdict);
Py_DECREF(masterdict);
masterdict = temp;
}
if (masterdict == NULL)
goto error;
/* Merge in __members__ and __methods__ (if any).
XXX Would like this to go away someday; for now, it's
XXX needed to get at im_self etc of method objects. */
if (merge_list_attr(masterdict, arg, "__members__") < 0)
goto error;
if (merge_list_attr(masterdict, arg, "__methods__") < 0)
goto error;
/* Merge in attrs reachable from its class.
CAUTION: Not all objects have a __class__ attr. */
itsclass = PyObject_GetAttrString(arg, "__class__");
if (itsclass == NULL)
PyErr_Clear();
else {
int status = merge_class_dict(masterdict, itsclass);
Py_DECREF(itsclass);
if (status < 0)
goto error;
}
}
assert((result == NULL) ^ (masterdict == NULL));
if (masterdict != NULL) {
/* The result comes from its keys. */
assert(result == NULL);
result = PyDict_Keys(masterdict);
if (result == NULL)
goto error;
}
assert(result);
if (PyList_Sort(result) != 0)
goto error;
else
goto normal_return;
error:
Py_XDECREF(result);
result = NULL;
/* fall through */
normal_return:
Py_XDECREF(masterdict);
return result;
}
1995-01-25 20:38:22 -04:00
1990-10-14 09:07:46 -03:00
/*
NoObject is usable as a non-NULL undefined value, used by the macro None.
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).
(XXX This type and the type of NotImplemented below should be unified.)
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
{
1997-05-02 00:12:38 -03:00
return PyString_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 accidently decref None out of existance.
*/
abort();
}
static PyTypeObject PyNone_Type = {
1997-05-02 00:12:38 -03:00
PyObject_HEAD_INIT(&PyType_Type)
1990-10-14 09:07:46 -03:00
0,
"NoneType",
1990-10-14 09:07:46 -03:00
0,
0,
(destructor)none_dealloc, /*tp_dealloc*/ /*never called*/
0, /*tp_print*/
1990-12-20 11:06:42 -04:00
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
1994-08-30 05:27:36 -03:00
(reprfunc)none_repr, /*tp_repr*/
1990-12-20 11:06:42 -04:00
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
1990-10-14 09:07:46 -03:00
};
1997-05-02 00:12:38 -03:00
PyObject _Py_NoneStruct = {
PyObject_HEAD_INIT(&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 PyString_FromString("NotImplemented");
}
static PyTypeObject PyNotImplemented_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"NotImplementedType",
0,
0,
(destructor)none_dealloc, /*tp_dealloc*/ /*never called*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
(reprfunc)NotImplemented_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
};
PyObject _Py_NotImplementedStruct = {
PyObject_HEAD_INIT(&PyNotImplemented_Type)
};
void
_Py_ReadyTypes(void)
{
if (PyType_Ready(&PyType_Type) < 0)
Py_FatalError("Can't initialize 'type'");
if (PyType_Ready(&PyList_Type) < 0)
Py_FatalError("Can't initialize 'list'");
if (PyType_Ready(&PyNone_Type) < 0)
Py_FatalError("Can't initialize type(None)");
if (PyType_Ready(&PyNotImplemented_Type) < 0)
Py_FatalError("Can't initialize type(NotImplemented)");
}
1990-10-14 09:07:46 -03:00
#ifdef Py_TRACE_REFS
1990-10-14 09:07:46 -03:00
1997-05-02 00:12:38 -03:00
static PyObject refchain = {&refchain, &refchain};
1990-10-14 09:07:46 -03:00
void
2000-07-09 12:48:49 -03:00
_Py_ResetReferences(void)
{
refchain._ob_prev = refchain._ob_next = &refchain;
_Py_RefTotal = 0;
}
void
2000-07-09 12:48:49 -03:00
_Py_NewReference(PyObject *op)
1990-10-14 09:07:46 -03:00
{
1997-05-02 00:12:38 -03:00
_Py_RefTotal++;
1990-10-14 09:07:46 -03:00
op->ob_refcnt = 1;
op->_ob_next = refchain._ob_next;
op->_ob_prev = &refchain;
refchain._ob_next->_ob_prev = op;
refchain._ob_next = op;
#ifdef COUNT_ALLOCS
inc_count(op->ob_type);
#endif
1990-10-14 09:07:46 -03:00
}
void
2000-07-09 12:48:49 -03:00
_Py_ForgetReference(register PyObject *op)
1990-10-14 09:07:46 -03:00
{
#ifdef SLOW_UNREF_CHECK
register PyObject *p;
#endif
if (op->ob_refcnt < 0)
1997-05-02 00:12:38 -03:00
Py_FatalError("UNREF negative refcnt");
if (op == &refchain ||
op->_ob_prev->_ob_next != op || op->_ob_next->_ob_prev != op)
1997-05-02 00:12:38 -03:00
Py_FatalError("UNREF invalid object");
#ifdef SLOW_UNREF_CHECK
1990-12-20 11:06:42 -04:00
for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) {
if (p == op)
break;
}
if (p == &refchain) /* Not found */
1997-05-02 00:12:38 -03:00
Py_FatalError("UNREF unknown object");
#endif
1990-10-14 09:07:46 -03:00
op->_ob_next->_ob_prev = op->_ob_prev;
op->_ob_prev->_ob_next = op->_ob_next;
op->_ob_next = op->_ob_prev = NULL;
1995-04-06 11:46:26 -03:00
#ifdef COUNT_ALLOCS
2001-08-02 01:15:00 -03:00
op->ob_type->tp_frees++;
1995-04-06 11:46:26 -03:00
#endif
1990-12-20 11:06:42 -04:00
}
void
2000-07-09 12:48:49 -03:00
_Py_Dealloc(PyObject *op)
1990-12-20 11:06:42 -04:00
{
destructor dealloc = op->ob_type->tp_dealloc;
1997-05-02 00:12:38 -03:00
_Py_ForgetReference(op);
(*dealloc)(op);
1990-10-14 09:07:46 -03:00
}
void
2000-07-09 12:48:49 -03:00
_Py_PrintReferences(FILE *fp)
1990-10-14 09:07:46 -03:00
{
1997-05-02 00:12:38 -03:00
PyObject *op;
fprintf(fp, "Remaining objects:\n");
1990-10-14 09:07:46 -03:00
for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
fprintf(fp, "[%d] ", op->ob_refcnt);
1997-05-02 00:12:38 -03:00
if (PyObject_Print(op, fp, 0) != 0)
PyErr_Clear();
1990-10-14 09:07:46 -03:00
putc('\n', fp);
}
}
PyObject *
2000-07-09 12:48:49 -03:00
_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 && op->ob_type != (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;
}
1990-10-14 09:07:46 -03:00
#endif
1996-01-11 21:24:09 -04:00
/* Hack to force loading of cobject.o */
1996-12-05 17:58:58 -04:00
PyTypeObject *_Py_cobject_hack = &PyCObject_Type;
/* Hack to force loading of abstract.o */
int (*_Py_abstract_hack)(PyObject *) = &PyObject_Size;
2000-08-16 09:27:23 -03:00
/* Python's malloc wrappers (see pymem.h) */
void *
2000-07-09 12:48:49 -03:00
PyMem_Malloc(size_t nbytes)
{
#if _PyMem_EXTRA > 0
if (nbytes == 0)
nbytes = _PyMem_EXTRA;
#endif
return PyMem_MALLOC(nbytes);
}
void *
PyMem_Realloc(void *p, size_t nbytes)
{
#if _PyMem_EXTRA > 0
if (nbytes == 0)
nbytes = _PyMem_EXTRA;
#endif
return PyMem_REALLOC(p, nbytes);
}
void
PyMem_Free(void *p)
{
PyMem_FREE(p);
}
/* Python's object malloc wrappers (see objimpl.h) */
void *
2000-07-09 12:48:49 -03:00
PyObject_Malloc(size_t nbytes)
{
return PyObject_MALLOC(nbytes);
}
void *
PyObject_Realloc(void *p, size_t nbytes)
{
return PyObject_REALLOC(p, nbytes);
}
void
PyObject_Free(void *p)
{
PyObject_FREE(p);
}
/* Hook to clear up weak references only once the _weakref module is
imported. We use a dummy implementation to simplify the code at each
call site instead of requiring a test for NULL.
*/
static void
empty_clear_weak_refs(PyObject *o)
{
return;
}
void (*PyObject_ClearWeakRefs)(PyObject *) = empty_clear_weak_refs;
/* 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
2000-07-09 12:48:49 -03:00
Py_ReprEnter(PyObject *obj)
{
PyObject *dict;
PyObject *list;
int i;
dict = PyThreadState_GetDict();
if (dict == NULL)
return -1;
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
2000-07-09 12:48:49 -03:00
Py_ReprLeave(PyObject *obj)
{
PyObject *dict;
PyObject *list;
int 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
CT 2k0130
non-recursively destroy nested objects
CT 2k0223
everything is now done in a macro.
CT 2k0305
modified to use functions, after Tim Peter's suggestion.
CT 2k0309
modified to restore a possible error.
CT 2k0325
added better safe than sorry check for threadstate
CT 2k0422
complete rewrite. We now build a chain via ob_type
and save the limited number of types in ob_refcnt.
This is perfect since we don't need any memory.
A patch for free-threading would need just a lock.
*/
#define Py_TRASHCAN_TUPLE 1
#define Py_TRASHCAN_LIST 2
#define Py_TRASHCAN_DICT 3
#define Py_TRASHCAN_FRAME 4
#define Py_TRASHCAN_TRACEBACK 5
/* extend here if other objects want protection */
int _PyTrash_delete_nesting = 0;
PyObject * _PyTrash_delete_later = NULL;
void
2000-07-09 12:48:49 -03:00
_PyTrash_deposit_object(PyObject *op)
{
int typecode;
if (PyTuple_Check(op))
typecode = Py_TRASHCAN_TUPLE;
else if (PyList_Check(op))
typecode = Py_TRASHCAN_LIST;
else if (PyDict_Check(op))
typecode = Py_TRASHCAN_DICT;
else if (PyFrame_Check(op))
typecode = Py_TRASHCAN_FRAME;
else if (PyTraceBack_Check(op))
typecode = Py_TRASHCAN_TRACEBACK;
2000-08-04 12:36:13 -03:00
else /* We have a bug here -- those are the only types in GC */ {
Py_FatalError("Type not supported in GC -- internal bug");
return; /* pacify compiler -- execution never here */
}
op->ob_refcnt = typecode;
op->ob_type = (PyTypeObject*)_PyTrash_delete_later;
_PyTrash_delete_later = op;
}
void
2000-07-09 12:48:49 -03:00
_PyTrash_destroy_chain(void)
{
while (_PyTrash_delete_later) {
PyObject *shredder = _PyTrash_delete_later;
_PyTrash_delete_later = (PyObject*) shredder->ob_type;
switch (shredder->ob_refcnt) {
case Py_TRASHCAN_TUPLE:
shredder->ob_type = &PyTuple_Type;
break;
case Py_TRASHCAN_LIST:
shredder->ob_type = &PyList_Type;
break;
case Py_TRASHCAN_DICT:
shredder->ob_type = &PyDict_Type;
break;
case Py_TRASHCAN_FRAME:
shredder->ob_type = &PyFrame_Type;
break;
case Py_TRASHCAN_TRACEBACK:
shredder->ob_type = &PyTraceBack_Type;
break;
}
_Py_NewReference(shredder);
++_PyTrash_delete_nesting;
Py_DECREF(shredder);
--_PyTrash_delete_nesting;
}
}
#ifdef WITH_PYMALLOC
#include "obmalloc.c"
#endif