Objects/object.c - platform/external/python/cpython2 - Gitiles

 /***********************************************************
 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
 Amsterdam, The Netherlands.

                         All Rights Reserved

 Permission to use, copy, modify, and distribute this software and its
 documentation for any purpose and without fee is hereby granted,
 provided that the above copyright notice appear in all copies and that
 both that copyright notice and this permission notice appear in
 supporting documentation, and that the names of Stichting Mathematisch
 Centrum or CWI not be used in advertising or publicity pertaining to
 distribution of the software without specific, written prior permission.

 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 ******************************************************************/

 /* Generic object operations; and implementation of None (NoObject) */

 #include "allobjects.h"

 #ifdef REF_DEBUG
 long ref_total;
 #endif

 /* 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! */

 object *
 newobject(tp)
 	typeobject *tp;
 {
 	object *op = (object *) malloc(tp->tp_basicsize);
 	if (op == NULL)
 		return err_nomem();
 	NEWREF(op);
 	op->ob_type = tp;
 	return op;
 }

 varobject *
 newvarobject(tp, size)
 	typeobject *tp;
 	unsigned int size;
 {
 	varobject *op = (varobject *)
 		malloc(tp->tp_basicsize + size * tp->tp_itemsize);
 	if (op == NULL)
 		return (varobject *)err_nomem();
 	NEWREF(op);
 	op->ob_type = tp;
 	op->ob_size = size;
 	return op;
 }

 int
 printobject(op, fp, flags)
 	object *op;
 	FILE *fp;
 	int flags;
 {
 	int ret = 0;
 	if (intrcheck()) {
 		err_set(KeyboardInterrupt);
 		return -1;
 	}
 	if (op == NULL) {
 		fprintf(fp, "<nil>");
 	}
 	else {
 		if (op->ob_refcnt <= 0)
 			fprintf(fp, "<refcnt %u at %lx>",
 				op->ob_refcnt, (long)op);
 		else if (op->ob_type->tp_print == NULL) {
 			if (op->ob_type->tp_repr == NULL) {
 				fprintf(fp, "<%s object at %lx>",
 					op->ob_type->tp_name, (long)op);
 			}
 			else {
 				object *s = reprobject(op);
 				if (s == NULL)
 					ret = -1;
 				else if (!is_stringobject(s)) {
 					err_setstr(TypeError,
 						   "repr not string");
 					ret = -1;
 				}
 				else {
 					fprintf(fp, "%s", getstringvalue(s));
 				}
 				XDECREF(s);
 			}
 		}
 		else
 			ret = (*op->ob_type->tp_print)(op, fp, flags);
 	}
 	if (ret == 0) {
 		if (ferror(fp)) {
 			err_errno(IOError);
 			clearerr(fp);
 			ret = -1;
 		}
 	}
 	return ret;
 }

 object *
 reprobject(v)
 	object *v;
 {
 	if (intrcheck()) {
 		err_set(KeyboardInterrupt);
 		return NULL;
 	}
 	if (v == NULL)
 		return newstringobject("<NULL>");
 	else if (v->ob_type->tp_repr == NULL) {
 		char buf[120];
 		sprintf(buf, "<%.80s object at %lx>",
 			v->ob_type->tp_name, (long)v);
 		return newstringobject(buf);
 	}
 	else
 		return (*v->ob_type->tp_repr)(v);
 }

 int
 cmpobject(v, w)
 	object *v, *w;
 {
 	typeobject *tp;
 	if (v == w)
 		return 0;
 	if (v == NULL)
 		return -1;
 	if (w == NULL)
 		return 1;
 	if ((tp = v->ob_type) != w->ob_type) {
 		if (tp->tp_as_number != NULL &&
 				w->ob_type->tp_as_number != NULL) {
 			if (coerce(&v, &w) != 0) {
 				err_clear();
 				/* XXX Should report the error,
 				   XXX but the interface isn't there... */
 			}
 			else {
 				int cmp = (*v->ob_type->tp_compare)(v, w);
 				DECREF(v);
 				DECREF(w);
 				return cmp;
 			}
 		}
 		return strcmp(tp->tp_name, w->ob_type->tp_name);
 	}
 	if (tp->tp_compare == NULL)
 		return (v < w) ? -1 : 1;
 	return (*tp->tp_compare)(v, w);
 }

 long
 hashobject(v)
 	object *v;
 {
 	typeobject *tp = v->ob_type;
 	if (tp->tp_hash != NULL)
 		return (*tp->tp_hash)(v);
 	if (tp->tp_compare == NULL)
 		return (long) v; /* Use address as hash value */
 	/* If there's a cmp but no hash defined, the object can't be hashed */
 	err_setstr(TypeError, "unhashable type");
 	return -1;
 }

 object *
 getattr(v, name)
 	object *v;
 	char *name;
 {
 	if (v->ob_type->tp_getattr == NULL) {
 		err_setstr(TypeError, "attribute-less object");
 		return NULL;
 	}
 	else {
 		return (*v->ob_type->tp_getattr)(v, name);
 	}
 }

 int
 setattr(v, name, w)
 	object *v;
 	char *name;
 	object *w;
 {
 	if (v->ob_type->tp_setattr == NULL) {
 		if (v->ob_type->tp_getattr == NULL)
 			err_setstr(TypeError,
 				   "attribute-less object (assign or del)");
 		else
 			err_setstr(TypeError,
 				   "object has read-only attributes");
 		return -1;
 	}
 	else {
 		return (*v->ob_type->tp_setattr)(v, name, w);
 	}
 }

 /* Test a value used as condition, e.g., in a for or if statement.
    Return -1 if an error occurred */

 int
 testbool(v)
 	object *v;
 {
 	int res;
 	if (v == None)
 		res = 0;
 	else if (v->ob_type->tp_as_number != NULL)
 		res = (*v->ob_type->tp_as_number->nb_nonzero)(v);
 	else if (v->ob_type->tp_as_mapping != NULL)
 		res = (*v->ob_type->tp_as_mapping->mp_length)(v);
 	else if (v->ob_type->tp_as_sequence != NULL)
 		res = (*v->ob_type->tp_as_sequence->sq_length)(v);
 	else
 		res = 1;
 	if (res > 0)
 		res = 1;
 	return res;
 }


 /*
 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,
 so there is exactly one (which is indestructible, by the way).
 */

 /* ARGSUSED */
 static object *
 none_repr(op)
 	object *op;
 {
 	return newstringobject("None");
 }

 static typeobject Notype = {
 	OB_HEAD_INIT(&Typetype)
 	0,
 	"None",
 	0,
 	0,
 	0,		/*tp_dealloc*/ /*never called*/
 	0,		/*tp_print*/
 	0,		/*tp_getattr*/
 	0,		/*tp_setattr*/
 	0,		/*tp_compare*/
 	none_repr,	/*tp_repr*/
 	0,		/*tp_as_number*/
 	0,		/*tp_as_sequence*/
 	0,		/*tp_as_mapping*/
 	0,		/*tp_hash */
 };

 object NoObject = {
 	OB_HEAD_INIT(&Notype)
 };


 #ifdef TRACE_REFS

 static object refchain = {&refchain, &refchain};

 NEWREF(op)
 	object *op;
 {
 	ref_total++;
 	op->ob_refcnt = 1;
 	op->_ob_next = refchain._ob_next;
 	op->_ob_prev = &refchain;
 	refchain._ob_next->_ob_prev = op;
 	refchain._ob_next = op;
 }

 UNREF(op)
 	register object *op;
 {
 	register object *p;
 	if (op->ob_refcnt < 0) {
 		fprintf(stderr, "UNREF negative refcnt\n");
 		abort();
 	}
 	if (op == &refchain ||
 	    op->_ob_prev->_ob_next != op || op->_ob_next->_ob_prev != op) {
 		fprintf(stderr, "UNREF invalid object\n");
 		abort();
 	}
 #ifdef SLOW_UNREF_CHECK
 	for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) {
 		if (p == op)
 			break;
 	}
 	if (p == &refchain) { /* Not found */
 		fprintf(stderr, "UNREF unknown object\n");
 		abort();
 	}
 #endif
 	op->_ob_next->_ob_prev = op->_ob_prev;
 	op->_ob_prev->_ob_next = op->_ob_next;
 	op->_ob_next = op->_ob_prev = NULL;
 }

 DELREF(op)
 	object *op;
 {
 	UNREF(op);
 	(*(op)->ob_type->tp_dealloc)(op);
 	op->ob_type = NULL;
 }

 printrefs(fp)
 	FILE *fp;
 {
 	object *op;
 	fprintf(fp, "Remaining objects (except strings referenced once):\n");
 	for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
 		if (op->ob_refcnt == 1 && is_stringobject(op))
 			continue; /* Will be printed elsewhere */
 		fprintf(fp, "[%d] ", op->ob_refcnt);
 		if (printobject(op, fp, 0) != 0)
 			err_clear();
 		putc('\n', fp);
 	}
 }

 #endif
	/***********************************************************
	Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
	Amsterdam, The Netherlands.

	All Rights Reserved

	Permission to use, copy, modify, and distribute this software and its
	documentation for any purpose and without fee is hereby granted,
	provided that the above copyright notice appear in all copies and that
	both that copyright notice and this permission notice appear in
	supporting documentation, and that the names of Stichting Mathematisch
	Centrum or CWI not be used in advertising or publicity pertaining to
	distribution of the software without specific, written prior permission.

	STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
	THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
	FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
	FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

	******************************************************************/

	/* Generic object operations; and implementation of None (NoObject) */

	#include "allobjects.h"

	#ifdef REF_DEBUG
	long ref_total;
	#endif

	/* 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! */

	object *
	newobject(tp)
	typeobject *tp;
	{
	object op = (object ) malloc(tp->tp_basicsize);
	if (op == NULL)
	return err_nomem();
	NEWREF(op);
	op->ob_type = tp;
	return op;
	}

	varobject *
	newvarobject(tp, size)
	typeobject *tp;
	unsigned int size;
	{
	varobject op = (varobject )
	malloc(tp->tp_basicsize + size * tp->tp_itemsize);
	if (op == NULL)
	return (varobject *)err_nomem();
	NEWREF(op);
	op->ob_type = tp;
	op->ob_size = size;
	return op;
	}

	int
	printobject(op, fp, flags)
	object *op;
	FILE *fp;
	int flags;
	{
	int ret = 0;
	if (intrcheck()) {
	err_set(KeyboardInterrupt);
	return -1;
	}
	if (op == NULL) {
	fprintf(fp, "<nil>");
	}
	else {
	if (op->ob_refcnt <= 0)
	fprintf(fp, "<refcnt %u at %lx>",
	op->ob_refcnt, (long)op);
	else if (op->ob_type->tp_print == NULL) {
	if (op->ob_type->tp_repr == NULL) {
	fprintf(fp, "<%s object at %lx>",
	op->ob_type->tp_name, (long)op);
	}
	else {
	object *s = reprobject(op);
	if (s == NULL)
	ret = -1;
	else if (!is_stringobject(s)) {
	err_setstr(TypeError,
	"repr not string");
	ret = -1;
	}
	else {
	fprintf(fp, "%s", getstringvalue(s));
	}
	XDECREF(s);
	}
	}
	else
	ret = (*op->ob_type->tp_print)(op, fp, flags);
	}
	if (ret == 0) {
	if (ferror(fp)) {
	err_errno(IOError);
	clearerr(fp);
	ret = -1;
	}
	}
	return ret;
	}

	object *
	reprobject(v)
	object *v;
	{
	if (intrcheck()) {
	err_set(KeyboardInterrupt);
	return NULL;
	}
	if (v == NULL)
	return newstringobject("<NULL>");
	else if (v->ob_type->tp_repr == NULL) {
	char buf[120];
	sprintf(buf, "<%.80s object at %lx>",
	v->ob_type->tp_name, (long)v);
	return newstringobject(buf);
	}
	else
	return (*v->ob_type->tp_repr)(v);
	}

	int
	cmpobject(v, w)
	object v, w;
	{
	typeobject *tp;
	if (v == w)
	return 0;
	if (v == NULL)
	return -1;
	if (w == NULL)
	return 1;
	if ((tp = v->ob_type) != w->ob_type) {
	if (tp->tp_as_number != NULL &&
	w->ob_type->tp_as_number != NULL) {
	if (coerce(&v, &w) != 0) {
	err_clear();
	/* XXX Should report the error,
	XXX but the interface isn't there... */
	}
	else {
	int cmp = (*v->ob_type->tp_compare)(v, w);
	DECREF(v);
	DECREF(w);
	return cmp;
	}
	}
	return strcmp(tp->tp_name, w->ob_type->tp_name);
	}
	if (tp->tp_compare == NULL)
	return (v < w) ? -1 : 1;
	return (*tp->tp_compare)(v, w);
	}

	long
	hashobject(v)
	object *v;
	{
	typeobject *tp = v->ob_type;
	if (tp->tp_hash != NULL)
	return (*tp->tp_hash)(v);
	if (tp->tp_compare == NULL)
	return (long) v; /* Use address as hash value */
	/* If there's a cmp but no hash defined, the object can't be hashed */
	err_setstr(TypeError, "unhashable type");
	return -1;
	}

	object *
	getattr(v, name)
	object *v;
	char *name;
	{
	if (v->ob_type->tp_getattr == NULL) {
	err_setstr(TypeError, "attribute-less object");
	return NULL;
	}
	else {
	return (*v->ob_type->tp_getattr)(v, name);
	}
	}

	int
	setattr(v, name, w)
	object *v;
	char *name;
	object *w;
	{
	if (v->ob_type->tp_setattr == NULL) {
	if (v->ob_type->tp_getattr == NULL)
	err_setstr(TypeError,
	"attribute-less object (assign or del)");
	else
	err_setstr(TypeError,
	"object has read-only attributes");
	return -1;
	}
	else {
	return (*v->ob_type->tp_setattr)(v, name, w);
	}
	}

	/* Test a value used as condition, e.g., in a for or if statement.
	Return -1 if an error occurred */

	int
	testbool(v)
	object *v;
	{
	int res;
	if (v == None)
	res = 0;
	else if (v->ob_type->tp_as_number != NULL)
	res = (*v->ob_type->tp_as_number->nb_nonzero)(v);
	else if (v->ob_type->tp_as_mapping != NULL)
	res = (*v->ob_type->tp_as_mapping->mp_length)(v);
	else if (v->ob_type->tp_as_sequence != NULL)
	res = (*v->ob_type->tp_as_sequence->sq_length)(v);
	else
	res = 1;
	if (res > 0)
	res = 1;
	return res;
	}


	/*
	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,
	so there is exactly one (which is indestructible, by the way).
	*/

	/* ARGSUSED */
	static object *
	none_repr(op)
	object *op;
	{
	return newstringobject("None");
	}

	static typeobject Notype = {
	OB_HEAD_INIT(&Typetype)
	0,
	"None",
	0,
	0,
	0, /tp_dealloc/ /never called/
	0, /tp_print/
	0, /tp_getattr/
	0, /tp_setattr/
	0, /tp_compare/
	none_repr, /tp_repr/
	0, /tp_as_number/
	0, /tp_as_sequence/
	0, /tp_as_mapping/
	0, /tp_hash /
	};

	object NoObject = {
	OB_HEAD_INIT(&Notype)
	};


	#ifdef TRACE_REFS

	static object refchain = {&refchain, &refchain};

	NEWREF(op)
	object *op;
	{
	ref_total++;
	op->ob_refcnt = 1;
	op->_ob_next = refchain._ob_next;
	op->_ob_prev = &refchain;
	refchain._ob_next->_ob_prev = op;
	refchain._ob_next = op;
	}

	UNREF(op)
	register object *op;
	{
	register object *p;
	if (op->ob_refcnt < 0) {
	fprintf(stderr, "UNREF negative refcnt\n");
	abort();
	}
	if (op == &refchain \|\|
	op->_ob_prev->_ob_next != op \|\| op->_ob_next->_ob_prev != op) {
	fprintf(stderr, "UNREF invalid object\n");
	abort();
	}
	#ifdef SLOW_UNREF_CHECK
	for (p = refchain._ob_next; p != &refchain; p = p->_ob_next) {
	if (p == op)
	break;
	}
	if (p == &refchain) { /* Not found */
	fprintf(stderr, "UNREF unknown object\n");
	abort();
	}
	#endif
	op->_ob_next->_ob_prev = op->_ob_prev;
	op->_ob_prev->_ob_next = op->_ob_next;
	op->_ob_next = op->_ob_prev = NULL;
	}

	DELREF(op)
	object *op;
	{
	UNREF(op);
	(*(op)->ob_type->tp_dealloc)(op);
	op->ob_type = NULL;
	}

	printrefs(fp)
	FILE *fp;
	{
	object *op;
	fprintf(fp, "Remaining objects (except strings referenced once):\n");
	for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
	if (op->ob_refcnt == 1 && is_stringobject(op))
	continue; /* Will be printed elsewhere */
	fprintf(fp, "[%d] ", op->ob_refcnt);
	if (printobject(op, fp, 0) != 0)
	err_clear();
	putc('\n', fp);
	}
	}

	#endif