зеркало из https://github.com/github/ruby.git
613 строки
13 KiB
C
613 строки
13 KiB
C
/*
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* This file is included by eval.c
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*/
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#define CACHE_SIZE 0x800
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#define CACHE_MASK 0x7ff
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#define EXPR1(c,m) ((((c)>>3)^(m))&CACHE_MASK)
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struct cache_entry { /* method hash table. */
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ID mid; /* method's id */
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ID mid0; /* method's original id */
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VALUE klass; /* receiver's class */
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NODE *method;
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};
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static struct cache_entry cache[CACHE_SIZE];
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static int ruby_running = 0;
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void
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rb_clear_cache(void)
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{
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struct cache_entry *ent, *end;
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rb_vm_change_state();
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if (!ruby_running)
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return;
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ent = cache;
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end = ent + CACHE_SIZE;
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while (ent < end) {
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ent->mid = 0;
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ent++;
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}
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}
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static void
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rb_clear_cache_for_undef(VALUE klass, ID id)
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{
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struct cache_entry *ent, *end;
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rb_vm_change_state();
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if (!ruby_running)
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return;
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ent = cache;
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end = ent + CACHE_SIZE;
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while (ent < end) {
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if (ent->method && ent->method->nd_clss == klass && ent->mid == id) {
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ent->mid = 0;
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}
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ent++;
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}
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}
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static void
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rb_clear_cache_by_id(ID id)
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{
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struct cache_entry *ent, *end;
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rb_vm_change_state();
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if (!ruby_running)
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return;
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ent = cache;
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end = ent + CACHE_SIZE;
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while (ent < end) {
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if (ent->mid == id) {
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ent->mid = 0;
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}
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ent++;
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}
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}
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void
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rb_clear_cache_by_class(VALUE klass)
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{
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struct cache_entry *ent, *end;
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rb_vm_change_state();
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if (!ruby_running)
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return;
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ent = cache;
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end = ent + CACHE_SIZE;
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while (ent < end) {
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if ((ent->klass == klass) ||
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(ent->method && ent->method->nd_clss == klass)) {
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ent->mid = 0;
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}
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ent++;
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}
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}
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void
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rb_add_method(VALUE klass, ID mid, NODE * node, int noex)
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{
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NODE *body;
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if (NIL_P(klass)) {
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klass = rb_cObject;
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}
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if (rb_safe_level() >= 4 && (klass == rb_cObject || !OBJ_TAINTED(klass))) {
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rb_raise(rb_eSecurityError, "Insecure: can't define method");
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}
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if (!FL_TEST(klass, FL_SINGLETON) &&
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node && nd_type(node) != NODE_ZSUPER &&
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(mid == rb_intern("initialize") || mid == rb_intern("initialize_copy"))) {
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noex = NOEX_PRIVATE | noex;
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}
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else if (FL_TEST(klass, FL_SINGLETON) && node
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&& nd_type(node) == NODE_CFUNC && mid == rb_intern("allocate")) {
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rb_warn
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("defining %s.allocate is deprecated; use rb_define_alloc_func()",
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rb_class2name(rb_iv_get(klass, "__attached__")));
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mid = ID_ALLOCATOR;
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}
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if (OBJ_FROZEN(klass)) {
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rb_error_frozen("class/module");
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}
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rb_clear_cache_by_id(mid);
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/*
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* NODE_METHOD (NEW_METHOD(body, klass, vis)):
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* nd_body : method body // (2) // mark
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* nd_clss : klass // (1) // mark
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* nd_noex : visibility // (3)
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*
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* NODE_FBODY (NEW_FBODY(method, alias)):
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* nd_body : method (NODE_METHOD) // (2) // mark
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* nd_oid : original id // (1)
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* nd_cnt : alias count // (3)
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*/
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if (node) {
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body = NEW_FBODY(NEW_METHOD(node, klass, noex), 0);
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}
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else {
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body = 0;
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}
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{
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/* check re-definition */
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NODE *old_node;
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if (st_lookup(RCLASS(klass)->m_tbl, mid, (st_data_t *)&old_node)) {
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if (old_node) {
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if (nd_type(old_node->nd_body->nd_body) == NODE_CFUNC) {
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rb_vm_check_redefinition_opt_method(old_node);
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}
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if (RTEST(ruby_verbose) && old_node->nd_cnt == 0 && old_node->nd_body) {
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rb_warning("method redefined; discarding old %s", rb_id2name(mid));
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}
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}
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if (klass == rb_cObject && node->nd_mid == init) {
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rb_warn("redefining Object#initialize may cause infinite loop");
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}
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}
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if (mid == object_id || mid == __send || mid == __send_bang) {
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if (node && nd_type(node) == RUBY_VM_METHOD_NODE) {
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rb_warn("redefining `%s' may cause serious problem",
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rb_id2name(mid));
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}
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}
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}
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st_insert(RCLASS(klass)->m_tbl, mid, (st_data_t) body);
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if (node && mid != ID_ALLOCATOR && ruby_running) {
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if (FL_TEST(klass, FL_SINGLETON)) {
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rb_funcall(rb_iv_get(klass, "__attached__"), singleton_added, 1,
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ID2SYM(mid));
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}
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else {
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rb_funcall(klass, added, 1, ID2SYM(mid));
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}
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}
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}
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void
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rb_define_alloc_func(VALUE klass, VALUE (*func) _((VALUE)))
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{
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Check_Type(klass, T_CLASS);
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rb_add_method(CLASS_OF(klass), ID_ALLOCATOR, NEW_CFUNC(func, 0),
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NOEX_PRIVATE);
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}
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void
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rb_undef_alloc_func(VALUE klass)
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{
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Check_Type(klass, T_CLASS);
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rb_add_method(CLASS_OF(klass), ID_ALLOCATOR, 0, NOEX_UNDEF);
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}
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static NODE *
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search_method(VALUE klass, ID id, VALUE *klassp)
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{
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NODE *body;
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if (!klass) {
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return 0;
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}
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while (!st_lookup(RCLASS(klass)->m_tbl, id, (st_data_t *) & body)) {
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klass = RCLASS(klass)->super;
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if (!klass)
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return 0;
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}
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if (klassp) {
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*klassp = klass;
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}
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return body;
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}
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/*
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* search method body (NODE_METHOD)
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* with : klass and id
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* without : method cache
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*
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* if you need method node with method cache, use
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* rb_method_node()
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*/
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NODE *
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rb_get_method_body(VALUE klass, ID id, ID *idp)
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{
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NODE *volatile fbody, *body;
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NODE *method;
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if ((fbody = search_method(klass, id, 0)) == 0 || !fbody->nd_body) {
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/* store empty info in cache */
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struct cache_entry *ent;
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ent = cache + EXPR1(klass, id);
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ent->klass = klass;
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ent->mid = ent->mid0 = id;
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ent->method = 0;
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return 0;
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}
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method = fbody->nd_body;
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if (ruby_running) {
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/* store in cache */
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struct cache_entry *ent;
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ent = cache + EXPR1(klass, id);
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ent->klass = klass;
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ent->mid = id;
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ent->mid0 = fbody->nd_oid;
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ent->method = body = method;
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}
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else {
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body = method;
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}
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if (idp) {
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*idp = fbody->nd_oid;
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}
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return body;
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}
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NODE *
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rb_method_node(VALUE klass, ID id)
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{
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struct cache_entry *ent;
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ent = cache + EXPR1(klass, id);
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if (ent->mid == id && ent->klass == klass && ent->method) {
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return ent->method;
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}
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return rb_get_method_body(klass, id, 0);
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}
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static void
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remove_method(VALUE klass, ID mid)
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{
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NODE *body;
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if (klass == rb_cObject) {
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rb_secure(4);
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}
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if (rb_safe_level() >= 4 && !OBJ_TAINTED(klass)) {
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rb_raise(rb_eSecurityError, "Insecure: can't remove method");
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}
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if (OBJ_FROZEN(klass))
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rb_error_frozen("class/module");
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if (mid == object_id || mid == __send || mid == __send_bang || mid == init) {
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rb_warn("removing `%s' may cause serious problem", rb_id2name(mid));
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}
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if (!st_delete(RCLASS(klass)->m_tbl, &mid, (st_data_t *) & body) ||
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!body->nd_body) {
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rb_name_error(mid, "method `%s' not defined in %s",
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rb_id2name(mid), rb_class2name(klass));
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}
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rb_clear_cache_for_undef(klass, mid);
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if (FL_TEST(klass, FL_SINGLETON)) {
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rb_funcall(rb_iv_get(klass, "__attached__"), singleton_removed, 1,
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ID2SYM(mid));
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}
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else {
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rb_funcall(klass, removed, 1, ID2SYM(mid));
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}
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}
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void
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rb_remove_method(VALUE klass, const char *name)
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{
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remove_method(klass, rb_intern(name));
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}
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/*
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* call-seq:
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* remove_method(symbol) => self
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*
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* Removes the method identified by _symbol_ from the current
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* class. For an example, see <code>Module.undef_method</code>.
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*/
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static VALUE
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rb_mod_remove_method(int argc, VALUE *argv, VALUE mod)
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{
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int i;
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for (i = 0; i < argc; i++) {
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remove_method(mod, rb_to_id(argv[i]));
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}
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return mod;
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}
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#undef rb_disable_super
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#undef rb_enable_super
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void
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rb_disable_super(VALUE klass, const char *name)
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{
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/* obsolete - no use */
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}
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void
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rb_enable_super(VALUE klass, const char *name)
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{
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rb_warning("rb_enable_super() is obsolete");
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}
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static void
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rb_export_method(VALUE klass, ID name, ID noex)
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{
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NODE *fbody;
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VALUE origin;
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if (klass == rb_cObject) {
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rb_secure(4);
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}
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fbody = search_method(klass, name, &origin);
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if (!fbody && TYPE(klass) == T_MODULE) {
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fbody = search_method(rb_cObject, name, &origin);
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}
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if (!fbody || !fbody->nd_body) {
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print_undef(klass, name);
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}
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if (fbody->nd_body->nd_noex != noex) {
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if (klass == origin) {
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fbody->nd_body->nd_noex = noex;
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}
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else {
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rb_add_method(klass, name, NEW_ZSUPER(), noex);
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}
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}
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}
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int
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rb_method_boundp(VALUE klass, ID id, int ex)
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{
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NODE *method;
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if ((method = rb_method_node(klass, id)) != 0) {
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if (ex && (method->nd_noex & NOEX_PRIVATE)) {
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return Qfalse;
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}
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return Qtrue;
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}
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return Qfalse;
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}
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void
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rb_attr(VALUE klass, ID id, int read, int write, int ex)
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{
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const char *name;
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char *buf;
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ID attriv;
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int noex;
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size_t len;
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if (!ex) {
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noex = NOEX_PUBLIC;
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}
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else {
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if (SCOPE_TEST(NOEX_PRIVATE)) {
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noex = NOEX_PRIVATE;
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rb_warning((SCOPE_CHECK(NOEX_MODFUNC)) ?
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"attribute accessor as module_function" :
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"private attribute?");
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}
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else if (SCOPE_TEST(NOEX_PROTECTED)) {
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noex = NOEX_PROTECTED;
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}
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else {
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noex = NOEX_PUBLIC;
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}
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}
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if (!rb_is_local_id(id) && !rb_is_const_id(id)) {
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rb_name_error(id, "invalid attribute name `%s'", rb_id2name(id));
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}
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name = rb_id2name(id);
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if (!name) {
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rb_raise(rb_eArgError, "argument needs to be symbol or string");
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}
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len = strlen(name) + 2;
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buf = ALLOCA_N(char, len);
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snprintf(buf, len, "@%s", name);
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attriv = rb_intern(buf);
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if (read) {
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rb_add_method(klass, id, NEW_IVAR(attriv), noex);
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}
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if (write) {
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rb_add_method(klass, rb_id_attrset(id), NEW_ATTRSET(attriv), noex);
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}
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}
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void
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rb_undef(VALUE klass, ID id)
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{
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VALUE origin;
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NODE *body;
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if (ruby_cbase() == rb_cObject && klass == rb_cObject) {
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rb_secure(4);
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}
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if (rb_safe_level() >= 4 && !OBJ_TAINTED(klass)) {
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rb_raise(rb_eSecurityError, "Insecure: can't undef `%s'",
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rb_id2name(id));
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}
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rb_frozen_class_p(klass);
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if (id == object_id || id == __send || id == __send_bang || id == init) {
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rb_warn("undefining `%s' may cause serious problem", rb_id2name(id));
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}
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body = search_method(klass, id, &origin);
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if (!body || !body->nd_body) {
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char *s0 = " class";
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VALUE c = klass;
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if (FL_TEST(c, FL_SINGLETON)) {
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VALUE obj = rb_iv_get(klass, "__attached__");
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switch (TYPE(obj)) {
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case T_MODULE:
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case T_CLASS:
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c = obj;
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s0 = "";
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}
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}
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else if (TYPE(c) == T_MODULE) {
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s0 = " module";
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}
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rb_name_error(id, "undefined method `%s' for%s `%s'",
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rb_id2name(id), s0, rb_class2name(c));
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}
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rb_add_method(klass, id, 0, NOEX_PUBLIC);
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if (FL_TEST(klass, FL_SINGLETON)) {
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rb_funcall(rb_iv_get(klass, "__attached__"),
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singleton_undefined, 1, ID2SYM(id));
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}
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else {
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rb_funcall(klass, undefined, 1, ID2SYM(id));
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}
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}
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/*
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* call-seq:
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* undef_method(symbol) => self
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*
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* Prevents the current class from responding to calls to the named
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* method. Contrast this with <code>remove_method</code>, which deletes
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* the method from the particular class; Ruby will still search
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* superclasses and mixed-in modules for a possible receiver.
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*
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* class Parent
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* def hello
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* puts "In parent"
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* end
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* end
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* class Child < Parent
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* def hello
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* puts "In child"
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* end
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* end
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*
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*
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* c = Child.new
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* c.hello
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*
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*
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* class Child
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* remove_method :hello # remove from child, still in parent
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* end
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* c.hello
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*
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*
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* class Child
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* undef_method :hello # prevent any calls to 'hello'
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* end
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* c.hello
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*
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* <em>produces:</em>
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*
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* In child
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* In parent
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* prog.rb:23: undefined method `hello' for #<Child:0x401b3bb4> (NoMethodError)
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*/
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static VALUE
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rb_mod_undef_method(int argc, VALUE *argv, VALUE mod)
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{
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int i;
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for (i = 0; i < argc; i++) {
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rb_undef(mod, rb_to_id(argv[i]));
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}
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return mod;
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}
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void
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rb_alias(VALUE klass, ID name, ID def)
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{
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NODE *orig_fbody, *node;
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VALUE singleton = 0;
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rb_frozen_class_p(klass);
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if (name == def)
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return;
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if (klass == rb_cObject) {
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rb_secure(4);
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}
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orig_fbody = search_method(klass, def, 0);
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if (!orig_fbody || !orig_fbody->nd_body) {
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if (TYPE(klass) == T_MODULE) {
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orig_fbody = search_method(rb_cObject, def, 0);
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}
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}
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if (!orig_fbody || !orig_fbody->nd_body) {
|
|
print_undef(klass, def);
|
|
}
|
|
if (FL_TEST(klass, FL_SINGLETON)) {
|
|
singleton = rb_iv_get(klass, "__attached__");
|
|
}
|
|
|
|
orig_fbody->nd_cnt++;
|
|
|
|
if (RTEST(ruby_verbose) &&
|
|
st_lookup(RCLASS(klass)->m_tbl, name, (st_data_t *) & node)) {
|
|
if (node && node->nd_cnt == 0 && node->nd_body) {
|
|
rb_warning("discarding old %s", rb_id2name(name));
|
|
}
|
|
}
|
|
|
|
st_insert(RCLASS(klass)->m_tbl, name,
|
|
(st_data_t) NEW_FBODY(
|
|
NEW_METHOD(orig_fbody->nd_body->nd_body,
|
|
orig_fbody->nd_body->nd_clss,
|
|
orig_fbody->nd_body->nd_noex), def));
|
|
|
|
rb_clear_cache_by_id(name);
|
|
|
|
if (singleton) {
|
|
rb_funcall(singleton, singleton_added, 1, ID2SYM(name));
|
|
}
|
|
else {
|
|
rb_funcall(klass, added, 1, ID2SYM(name));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* alias_method(new_name, old_name) => self
|
|
*
|
|
* Makes <i>new_name</i> a new copy of the method <i>old_name</i>. This can
|
|
* be used to retain access to methods that are overridden.
|
|
*
|
|
* module Mod
|
|
* alias_method :orig_exit, :exit
|
|
* def exit(code=0)
|
|
* puts "Exiting with code #{code}"
|
|
* orig_exit(code)
|
|
* end
|
|
* end
|
|
* include Mod
|
|
* exit(99)
|
|
*
|
|
* <em>produces:</em>
|
|
*
|
|
* Exiting with code 99
|
|
*/
|
|
|
|
static VALUE
|
|
rb_mod_alias_method(VALUE mod, VALUE newname, VALUE oldname)
|
|
{
|
|
rb_alias(mod, rb_to_id(newname), rb_to_id(oldname));
|
|
return mod;
|
|
}
|