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

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);
if (err_occurred())
fatal("can't insert sys.* objects in sys dict");
DECREF(exit);
DECREF(v);
/* The other symbols are added elsewhere */
@ -141,16 +142,50 @@ initsys(argc, argv)
fatal("can't create sys module");
if (setmoduledict(v, sysdict) != 0)
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
closesys()
{
object *mtab;
mtab = sysget("modules");
if (mtab != NULL && is_dictobject(mtab))
dictremove(mtab, "sys"); /* Get rid of recursion */
else
fprintf(stderr, "[module sys not found]\n");
object *modules;
modules = sysget("modules");
if (modules != NULL && is_dictobject(modules)) {
int i;
/* Explicitly erase all modules; this is the safest way
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);
}