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/************************************************
methods.c -
$Author: matz $
$Date: 1994/06/17 14:23:50 $
created at: Fri Oct 1 17:25:07 JST 1993
Copyright (C) 1994 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
#include "ident.h"
#include "env.h"
#include "node.h"
#include "methods.h"
void method_free();
#define CACHE_SIZE 577
#if 0
#define EXPR1(c,m) (((int)(c)*(m))>>0)
#else
#define EXPR1(c,m) ((int)(c)^(m))
#endif
#define TRIAL 3
struct hash_entry { /* method hash table. */
ID mid; /* method's id */
struct RClass *class; /* receiver's class */
struct RClass *origin; /* where method defined */
struct SMethod *method;
int undef;
};
static struct hash_entry cache[CACHE_SIZE];
static struct SMethod*
search_method(class, id, origin)
struct RClass *class, **origin;
ID id;
{
struct SMethod *body;
NODE *list;
while (!st_lookup(class->m_tbl, id, &body)) {
class = class->super;
if (class == Qnil) return Qnil;
}
if (body->origin)
*origin = body->origin;
else
*origin = class;
return body;
}
NODE*
rb_get_method_body(class, id, envset)
struct RClass *class;
ID id;
int envset;
{
int pos, i;
struct SMethod *method;
/* is it in the method cache? */
pos = EXPR1(class, id) % CACHE_SIZE;
if (cache[pos].class != class || cache[pos].mid != id) {
/* not in the cache */
struct SMethod *body;
struct RClass *origin;
if ((body = search_method(class, id, &origin)) == Qnil) {
return Qnil;
}
/* store in cache */
cache[pos].mid = id;
cache[pos].class = class;
cache[pos].origin = origin;
cache[pos].method = body;
cache[pos].undef = body->undef;
}
method = cache[pos].method;
if (cache[pos].undef) return Qnil;
if (envset) {
the_env->last_func = method->id;
the_env->last_class = cache[pos].origin;
}
return method->node;
}
void
rb_alias(class, name, def)
struct RClass *class;
ID name, def;
{
struct SMethod *body;
if (st_lookup(class->m_tbl, name, &body)) {
if (verbose) {
Warning("redefine %s", rb_id2name(name));
}
rb_clear_cache(body);
method_free(body);
}
body = search_method(class, def, &body);
body->count++;
st_insert(class->m_tbl, name, body);
}
void
rb_clear_cache(body)
struct SMethod *body;
{
int i;
for (i = 0; i< CACHE_SIZE; i++ ) {
if (cache[i].method == body) {
cache[i].class = Qnil;
cache[i].mid = Qnil;
}
}
}
void
rb_clear_cache2(class)
struct RClass *class;
{
int i;
for (i = 0; i< CACHE_SIZE; i++ ) {
if (cache[i].origin == class) {
cache[i].class = Qnil;
cache[i].mid = Qnil;
}
}
}
void
method_free(body)
struct SMethod *body;
{
body->count--;
if (body->count == 0) {
freenode(body->node);
free(body);
}
}
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