void
rb_alias(VALUE klass, ID name, ID def)
{
NODE *orig_fbody, *node, *method;
VALUE singleton = 0;
st_data_t data;
rb_frozen_class_p(klass);
if (klass == rb_cObject) {
rb_secure(4);
}
orig_fbody = search_method(klass, def, 0);
if (!orig_fbody || !orig_fbody->nd_body) {
if (TYPE(klass) == T_MODULE) {
orig_fbody = search_method(rb_cObject, def, 0);
}
}
if (!orig_fbody || !orig_fbody->nd_body) {
rb_print_undef(klass, def, 0);
}
if (FL_TEST(klass, FL_SINGLETON)) {
singleton = rb_iv_get(klass, "__attached__");
}
orig_fbody->nd_cnt++;
if (st_lookup(RCLASS_M_TBL(klass), name, &data)) {
node = (NODE *)data;
if (node) {
if (RTEST(ruby_verbose) && node->nd_cnt == 0 && node->nd_body) {
rb_warning("discarding old %s", rb_id2name(name));
}
if (nd_type(node->nd_body->nd_body) == NODE_CFUNC) {
rb_vm_check_redefinition_opt_method(node);
}
}
}
st_insert(RCLASS_M_TBL(klass), name,
(st_data_t) NEW_FBODY(
method = NEW_METHOD(orig_fbody->nd_body->nd_body,
orig_fbody->nd_body->nd_clss,
NOEX_WITH_SAFE(orig_fbody->nd_body->nd_noex)), def));
method->nd_file = (void *)def;
rb_clear_cache_by_id(name);
if (!ruby_running) return;
if (singleton) {
rb_funcall(singleton, singleton_added, 1, ID2SYM(name));
}
else {
rb_funcall(klass, added, 1, ID2SYM(name));
}
}
static int
clone_method(ID mid, NODE *body, struct clone_method_data *data)
{
if (body == 0) {
st_insert(data->tbl, mid, 0);
}
else {
st_insert(data->tbl, mid,
(st_data_t)
NEW_FBODY(
NEW_METHOD(body->nd_body->nd_body,
data->klass, /* TODO */
body->nd_body->nd_noex),
0));
}
return ST_CONTINUE;
}
void
rb_add_method(VALUE klass, ID mid, NODE * node, int noex)
{
NODE *body;
if (NIL_P(klass)) {
klass = rb_cObject;
}
if (rb_safe_level() >= 4 && (klass == rb_cObject || !OBJ_TAINTED(klass))) {
rb_raise(rb_eSecurityError, "Insecure: can't define method");
}
if (!FL_TEST(klass, FL_SINGLETON) &&
node && nd_type(node) != NODE_ZSUPER &&
(mid == rb_intern("initialize") || mid == rb_intern("initialize_copy"))) {
noex = NOEX_PRIVATE | noex;
}
else if (FL_TEST(klass, FL_SINGLETON) && node
&& nd_type(node) == NODE_CFUNC && mid == rb_intern("allocate")) {
rb_warn
("defining %s.allocate is deprecated; use rb_define_alloc_func()",
rb_class2name(rb_iv_get(klass, "__attached__")));
mid = ID_ALLOCATOR;
}
if (OBJ_FROZEN(klass)) {
rb_error_frozen("class/module");
}
rb_clear_cache_by_id(mid);
/*
* NODE_METHOD (NEW_METHOD(body, klass, vis)):
* nd_body : method body // (2) // mark
* nd_clss : klass // (1) // mark
* nd_noex : visibility // (3)
*
* NODE_FBODY (NEW_FBODY(method, alias)):
* nd_body : method (NODE_METHOD) // (2) // mark
* nd_oid : original id // (1)
* nd_cnt : alias count // (3)
*/
if (node) {
body = NEW_FBODY(NEW_METHOD(node, klass, NOEX_WITH_SAFE(noex)), 0);
}
else {
body = 0;
}
{
/* check re-definition */
st_data_t data;
NODE *old_node;
if (st_lookup(RCLASS_M_TBL(klass), mid, &data)) {
old_node = (NODE *)data;
if (old_node) {
if (nd_type(old_node->nd_body->nd_body) == NODE_CFUNC) {
rb_vm_check_redefinition_opt_method(old_node);
}
if (RTEST(ruby_verbose) && node && old_node->nd_cnt == 0 && old_node->nd_body) {
rb_warning("method redefined; discarding old %s", rb_id2name(mid));
}
}
}
if (klass == rb_cObject && node && mid == idInitialize) {
rb_warn("redefining Object#initialize may cause infinite loop");
}
if (mid == object_id || mid == __send__) {
if (node && nd_type(node) == RUBY_VM_METHOD_NODE) {
rb_warn("redefining `%s' may cause serious problem",
rb_id2name(mid));
}
}
}
st_insert(RCLASS_M_TBL(klass), mid, (st_data_t) body);
if (node && mid != ID_ALLOCATOR && ruby_running) {
if (FL_TEST(klass, FL_SINGLETON)) {
rb_funcall(rb_iv_get(klass, "__attached__"), singleton_added, 1,
ID2SYM(mid));
}
else {
rb_funcall(klass, added, 1, ID2SYM(mid));
}
}
}
