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/* Object implementation; and 'noobject' implementation */
#include <stdio.h>
#include "PROTO.h"
#include "object.h"
#include "stringobject.h"
#include "objimpl.h"
#include "errors.h"
int StopPrint; /* Flag to indicate printing must be stopped */
/* Object allocation routines used by NEWOBJ and NEWVAROBJ macros */
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;
}
#if 0 /* unused */
varobject *
newvarobject(tp, size)
typeobject *tp;
unsigned int size;
{
varobject *op = (varobject *)
malloc(tp->tp_basicsize + size * tp->tp_itemsize);
if (op == NULL)
return err_nomem();
NEWREF(op);
op->ob_type = tp;
op->ob_size = size;
return op;
}
#endif
static int prlevel;
void
printobject(op, fp, flags)
object *op;
FILE *fp;
int flags;
{
/* Hacks to make printing a long or recursive object interruptible */
prlevel++;
if (!StopPrint && intrcheck()) {
fprintf(fp, "\n[print interrupted]\n");
StopPrint = 1;
}
if (!StopPrint) {
if (op == NULL) {
fprintf(fp, "<nil>");
}
else if (op->ob_type->tp_print == NULL) {
fprintf(fp, "<%s object at %lx>",
op->ob_type->tp_name, (long)op);
}
else {
(*op->ob_type->tp_print)(op, fp, flags);
}
}
prlevel--;
if (prlevel == 0)
StopPrint = 0;
}
object *
reprobject(v)
object *v;
{
object *w;
/* Hacks to make converting a long or recursive object interruptible */
prlevel++;
if (!StopPrint && intrcheck()) {
StopPrint = 1;
w = NULL;
err_set(KeyboardInterrupt);
}
if (!StopPrint) {
if (v == NULL) {
w = newstringobject("<nil>");
}
else if (v->ob_type->tp_repr == NULL) {
char buf[100];
sprintf(buf, "<%.80s object at %lx>",
v->ob_type->tp_name, (long)v);
w = newstringobject(buf);
}
else {
w = (*v->ob_type->tp_repr)(v);
}
}
prlevel--;
if (prlevel == 0)
StopPrint = 0;
return w;
}
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)
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));
}
/*
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.
*/
static void
noprint(op, fp, flags)
object *op;
FILE *fp;
int flags;
{
fprintf(fp, "<no value>");
}
static typeobject Notype = {
OB_HEAD_INIT(&Typetype)
0,
"novalue",
0,
0,
0, /*tp_dealloc*/ /*never called*/
noprint, /*tp_print*/
};
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;
}
DELREF(op)
object *op;
{
if (op->ob_refcnt < 0) {
fprintf(stderr, "negative refcnt\n");
abort();
}
op->_ob_next->_ob_prev = op->_ob_prev;
op->_ob_prev->_ob_next = op->_ob_next;
(*(op)->ob_type->tp_dealloc)(op);
}
printrefs(fp)
FILE *fp;
{
object *op;
fprintf(fp, "Remaining objects:\n");
for (op = refchain._ob_next; op != &refchain; op = op->_ob_next) {
fprintf(fp, "[%d] ", op->ob_refcnt);
printobject(op, fp, 0);
putc('\n', fp);
}
}
#endif
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