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Empty all modules' symbol tables, so most circular references are

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cleared up.
(A function definition references its module's symbol table but
the symbol table of course references the function...)
This commit is contained in:
Guido van Rossum 1990-11-18 17:41:40 +00:00
parent 392ab32859
commit 5b3138bec0
1 changed files with 41 additions and 6 deletions
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47
Python/sysmodule.c
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@ -131,6 +131,7 @@ initsys(argc, argv)
dictinsert(sysdict, "exit", exit); dictinsert(sysdict, "exit", exit);
if (err_occurred()) if (err_occurred())
fatal("can't insert sys.* objects in sys dict"); fatal("can't insert sys.* objects in sys dict");
DECREF(exit);
DECREF(v); DECREF(v);
/* The other symbols are added elsewhere */ /* The other symbols are added elsewhere */
@ -141,16 +142,50 @@ initsys(argc, argv)
fatal("can't create sys module"); fatal("can't create sys module");
if (setmoduledict(v, sysdict) != 0) if (setmoduledict(v, sysdict) != 0)
fatal("can't assign sys dict to sys module"); fatal("can't assign sys dict to sys module");
DECREF(v);
}
static void
cleardict(d)
object *d;
{
int i;
for (i = getdictsize(d); --i >= 0; ) {
char *k;
k = getdictkey(d, i);
if (k != NULL) {
(void) dictremove(d, k);
}
}
} }
void void
closesys() closesys()
{ {
object *mtab; object *modules;
mtab = sysget("modules"); modules = sysget("modules");
if (mtab != NULL && is_dictobject(mtab)) if (modules != NULL && is_dictobject(modules)) {
dictremove(mtab, "sys"); /* Get rid of recursion */ int i;
else /* Explicitly erase all modules; this is the safest way
fprintf(stderr, "[module sys not found]\n"); to get rid of at least *some* circular dependencies */
INCREF(modules);
for (i = getdictsize(modules); --i >= 0; ) {
char *k;
k = getdictkey(modules, i);
if (k != NULL) {
object *m;
m = dictlookup(modules, k);
if (m != NULL && is_moduleobject(m)) {
object *d;
d = getmoduledict(m);
if (d != NULL && is_dictobject(d)) {
cleardict(d);
}
}
}
}
cleardict(modules);
DECREF(modules);
}
DECREF(sysdict); DECREF(sysdict);
} }