diff options
Diffstat (limited to 'vm_method.c')
| -rw-r--r-- | vm_method.c | 1338 |
1 files changed, 1338 insertions, 0 deletions
diff --git a/vm_method.c b/vm_method.c new file mode 100644 index 0000000000..50f0b12e5a --- /dev/null +++ b/vm_method.c @@ -0,0 +1,1338 @@ +/* + * This file is included by vm.h + */ + +#define CACHE_SIZE 0x800 +#define CACHE_MASK 0x7ff +#define EXPR1(c,m) ((((c)>>3)^(m))&CACHE_MASK) + +static void rb_vm_check_redefinition_opt_method(const rb_method_entry_t *me); + +static ID object_id, respond_to_missing; +static ID removed, singleton_removed, undefined, singleton_undefined; +static ID added, singleton_added, attached; + +struct cache_entry { /* method hash table. */ + ID mid; /* method's id */ + VALUE klass; /* receiver's class */ + rb_method_entry_t *me; +}; + +static struct cache_entry cache[CACHE_SIZE]; +#define ruby_running (GET_VM()->running) +/* int ruby_running = 0; */ + +void +rb_clear_cache(void) +{ + struct cache_entry *ent, *end; + + rb_vm_change_state(); + + if (!ruby_running) + return; + ent = cache; + end = ent + CACHE_SIZE; + while (ent < end) { + ent->me = 0; + ent->mid = 0; + ent++; + } +} + +static void +rb_clear_cache_for_undef(VALUE klass, ID id) +{ + struct cache_entry *ent, *end; + + rb_vm_change_state(); + + if (!ruby_running) + return; + ent = cache; + end = ent + CACHE_SIZE; + while (ent < end) { + if ((ent->me && ent->me->klass == klass) && ent->mid == id) { + ent->me = 0; + ent->mid = 0; + } + ent++; + } +} + +static void +rb_clear_cache_by_id(ID id) +{ + struct cache_entry *ent, *end; + + rb_vm_change_state(); + + if (!ruby_running) + return; + ent = cache; + end = ent + CACHE_SIZE; + while (ent < end) { + if (ent->mid == id) { + ent->me = 0; + ent->mid = 0; + } + ent++; + } +} + +void +rb_clear_cache_by_class(VALUE klass) +{ + struct cache_entry *ent, *end; + + rb_vm_change_state(); + + if (!ruby_running) + return; + ent = cache; + end = ent + CACHE_SIZE; + while (ent < end) { + if (ent->klass == klass || (ent->me && ent->me->klass == klass)) { + ent->me = 0; + ent->mid = 0; + } + ent++; + } +} + +VALUE +rb_f_notimplement(int argc, VALUE *argv, VALUE obj) +{ + rb_notimplement(); +} + +static void +rb_define_notimplement_method_id(VALUE mod, ID id, rb_method_flag_t noex) +{ + rb_add_method(mod, id, VM_METHOD_TYPE_NOTIMPLEMENTED, 0, noex); +} + +void +rb_add_method_cfunc(VALUE klass, ID mid, VALUE (*func)(ANYARGS), int argc, rb_method_flag_t noex) +{ + if (func != rb_f_notimplement) { + rb_method_cfunc_t opt; + opt.func = func; + opt.argc = argc; + rb_add_method(klass, mid, VM_METHOD_TYPE_CFUNC, &opt, noex); + } + else { + rb_define_notimplement_method_id(klass, mid, noex); + } +} + +static void +rb_unlink_method_entry(rb_method_entry_t *me) +{ + struct unlinked_method_entry_list_entry *ume = ALLOC(struct unlinked_method_entry_list_entry); + ume->me = me; + ume->next = GET_VM()->unlinked_method_entry_list; + GET_VM()->unlinked_method_entry_list = ume; +} + +void +rb_sweep_method_entry(void *pvm) +{ + rb_vm_t *vm = pvm; + struct unlinked_method_entry_list_entry *ume = vm->unlinked_method_entry_list, *prev_ume = 0, *curr_ume; + + while (ume) { + if (ume->me->mark) { + ume->me->mark = 0; + prev_ume = ume; + ume = ume->next; + } + else { + rb_free_method_entry(ume->me); + + if (prev_ume == 0) { + vm->unlinked_method_entry_list = ume->next; + } + else { + prev_ume->next = ume->next; + } + + curr_ume = ume; + ume = ume->next; + xfree(curr_ume); + } + } +} + +void +rb_free_method_entry(rb_method_entry_t *me) +{ + rb_method_definition_t *def = me->def; + + if (def) { + if (def->alias_count == 0) { + xfree(def); + } + else if (def->alias_count > 0) { + def->alias_count--; + } + me->def = 0; + } + xfree(me); +} + +static int rb_method_definition_eq(const rb_method_definition_t *d1, const rb_method_definition_t *d2); + +static rb_method_entry_t * +rb_method_entry_make(VALUE klass, ID mid, rb_method_type_t type, + rb_method_definition_t *def, rb_method_flag_t noex) +{ + rb_method_entry_t *me; + st_table *mtbl; + st_data_t data; + + if (NIL_P(klass)) { + klass = rb_cObject; + } + if (rb_safe_level() >= 4 && + (klass == rb_cObject || !OBJ_UNTRUSTED(klass))) { + rb_raise(rb_eSecurityError, "Insecure: can't define method"); + } + if (!FL_TEST(klass, FL_SINGLETON) && + type != VM_METHOD_TYPE_NOTIMPLEMENTED && + type != VM_METHOD_TYPE_ZSUPER && + (mid == rb_intern("initialize") || mid == rb_intern("initialize_copy"))) { + noex = NOEX_PRIVATE | noex; + } + else if (FL_TEST(klass, FL_SINGLETON) && + type == VM_METHOD_TYPE_CFUNC && + mid == rb_intern("allocate")) { + rb_warn("defining %s.allocate is deprecated; use rb_define_alloc_func()", + rb_class2name(rb_ivar_get(klass, attached))); + mid = ID_ALLOCATOR; + } + if (OBJ_FROZEN(klass)) { + rb_error_frozen("class/module"); + } + + mtbl = RCLASS_M_TBL(klass); + + /* check re-definition */ + if (st_lookup(mtbl, mid, &data)) { + rb_method_entry_t *old_me = (rb_method_entry_t *)data; + rb_method_definition_t *old_def = old_me->def; + + if (rb_method_definition_eq(old_def, def)) return old_me; + rb_vm_check_redefinition_opt_method(old_me); + + if (RTEST(ruby_verbose) && + type != VM_METHOD_TYPE_UNDEF && + old_def->alias_count == 0 && + old_def->type != VM_METHOD_TYPE_UNDEF && + old_def->type != VM_METHOD_TYPE_ZSUPER) { + extern rb_iseq_t *rb_proc_get_iseq(VALUE proc, int *is_proc); + rb_iseq_t *iseq = 0; + + rb_warning("method redefined; discarding old %s", rb_id2name(mid)); + switch (old_def->type) { + case VM_METHOD_TYPE_ISEQ: + iseq = old_def->body.iseq; + break; + case VM_METHOD_TYPE_BMETHOD: + iseq = rb_proc_get_iseq(old_def->body.proc, 0); + break; + default: + break; + } + if (iseq && !NIL_P(iseq->filename)) { + int line = iseq->insn_info_table ? rb_iseq_first_lineno(iseq) : 0; + rb_compile_warning(RSTRING_PTR(iseq->filename), line, + "previous definition of %s was here", + rb_id2name(old_def->original_id)); + } + } + + rb_unlink_method_entry(old_me); + } + + me = ALLOC(rb_method_entry_t); + + rb_clear_cache_by_id(mid); + + me->flag = NOEX_WITH_SAFE(noex); + me->mark = 0; + me->called_id = mid; + me->klass = klass; + me->def = def; + if (def) def->alias_count++; + + /* check mid */ + if (klass == rb_cObject && mid == idInitialize) { + rb_warn("redefining Object#initialize may cause infinite loop"); + } + /* check mid */ + if (mid == object_id || mid == id__send__) { + if (type == VM_METHOD_TYPE_ISEQ) { + rb_warn("redefining `%s' may cause serious problems", rb_id2name(mid)); + } + } + + st_insert(mtbl, mid, (st_data_t) me); + + return me; +} + +#define CALL_METHOD_HOOK(klass, hook, mid) do { \ + const VALUE arg = ID2SYM(mid); \ + VALUE recv_class = klass; \ + ID hook_id = hook; \ + if (FL_TEST(klass, FL_SINGLETON)) { \ + recv_class = rb_ivar_get(klass, attached); \ + hook_id = singleton_##hook; \ + } \ + rb_funcall2(recv_class, hook_id, 1, &arg); \ + } while (0) + +static void +method_added(VALUE klass, ID mid) +{ + if (mid != ID_ALLOCATOR && ruby_running) { + CALL_METHOD_HOOK(klass, added, mid); + } +} + +rb_method_entry_t * +rb_add_method(VALUE klass, ID mid, rb_method_type_t type, void *opts, rb_method_flag_t noex) +{ + rb_thread_t *th; + rb_control_frame_t *cfp; + int line; + rb_method_entry_t *me = rb_method_entry_make(klass, mid, type, 0, noex); + rb_method_definition_t *def = ALLOC(rb_method_definition_t); + me->def = def; + def->type = type; + def->original_id = mid; + def->alias_count = 0; + switch (type) { + case VM_METHOD_TYPE_ISEQ: + def->body.iseq = (rb_iseq_t *)opts; + break; + case VM_METHOD_TYPE_CFUNC: + def->body.cfunc = *(rb_method_cfunc_t *)opts; + break; + case VM_METHOD_TYPE_ATTRSET: + case VM_METHOD_TYPE_IVAR: + def->body.attr.id = (ID)opts; + def->body.attr.location = Qfalse; + th = GET_THREAD(); + cfp = rb_vm_get_ruby_level_next_cfp(th, th->cfp); + if (cfp && (line = rb_vm_get_sourceline(cfp))) { + VALUE location = rb_ary_new3(2, cfp->iseq->filename, INT2FIX(line)); + def->body.attr.location = rb_ary_freeze(location); + } + break; + case VM_METHOD_TYPE_BMETHOD: + def->body.proc = (VALUE)opts; + break; + case VM_METHOD_TYPE_NOTIMPLEMENTED: + def->body.cfunc.func = rb_f_notimplement; + def->body.cfunc.argc = -1; + break; + case VM_METHOD_TYPE_OPTIMIZED: + def->body.optimize_type = (enum method_optimized_type)opts; + break; + case VM_METHOD_TYPE_ZSUPER: + case VM_METHOD_TYPE_UNDEF: + break; + default: + rb_bug("rb_add_method: unsupported method type (%d)\n", type); + } + method_added(klass, mid); + return me; +} + +rb_method_entry_t * +rb_method_entry_set(VALUE klass, ID mid, const rb_method_entry_t *me, rb_method_flag_t noex) +{ + rb_method_type_t type = me->def ? me->def->type : VM_METHOD_TYPE_UNDEF; + rb_method_entry_t *newme = rb_method_entry_make(klass, mid, type, me->def, noex); + method_added(klass, mid); + return newme; +} + +void +rb_define_alloc_func(VALUE klass, VALUE (*func)(VALUE)) +{ + Check_Type(klass, T_CLASS); + rb_add_method_cfunc(rb_singleton_class(klass), ID_ALLOCATOR, + func, 0, NOEX_PRIVATE); +} + +void +rb_undef_alloc_func(VALUE klass) +{ + Check_Type(klass, T_CLASS); + rb_add_method(rb_singleton_class(klass), ID_ALLOCATOR, VM_METHOD_TYPE_UNDEF, 0, NOEX_UNDEF); +} + +rb_alloc_func_t +rb_get_alloc_func(VALUE klass) +{ + rb_method_entry_t *me; + Check_Type(klass, T_CLASS); + me = rb_method_entry(CLASS_OF(klass), ID_ALLOCATOR); + + if (me && me->def && me->def->type == VM_METHOD_TYPE_CFUNC) { + return (rb_alloc_func_t)me->def->body.cfunc.func; + } + else { + return 0; + } +} + +static rb_method_entry_t* +search_method(VALUE klass, ID id) +{ + st_data_t body; + if (!klass) { + return 0; + } + + while (!st_lookup(RCLASS_M_TBL(klass), id, &body)) { + klass = RCLASS_SUPER(klass); + if (!klass) { + return 0; + } + } + + return (rb_method_entry_t *)body; +} + +/* + * search method entry without the method cache. + * + * if you need method entry with method cache (normal case), use + * rb_method_entry() simply. + */ +rb_method_entry_t * +rb_method_entry_get_without_cache(VALUE klass, ID id) +{ + rb_method_entry_t *me = search_method(klass, id); + + if (ruby_running) { + struct cache_entry *ent; + ent = cache + EXPR1(klass, id); + ent->klass = klass; + + if (UNDEFINED_METHOD_ENTRY_P(me)) { + ent->mid = id; + ent->me = 0; + me = 0; + } + else { + ent->mid = id; + ent->me = me; + } + } + + return me; +} + +rb_method_entry_t * +rb_method_entry(VALUE klass, ID id) +{ + struct cache_entry *ent; + + ent = cache + EXPR1(klass, id); + if (ent->mid == id && ent->klass == klass) { + return ent->me; + } + + return rb_method_entry_get_without_cache(klass, id); +} + +static void +remove_method(VALUE klass, ID mid) +{ + st_data_t data; + rb_method_entry_t *me = 0; + + if (klass == rb_cObject) { + rb_secure(4); + } + if (rb_safe_level() >= 4 && !OBJ_UNTRUSTED(klass)) { + rb_raise(rb_eSecurityError, "Insecure: can't remove method"); + } + if (OBJ_FROZEN(klass)) + rb_error_frozen("class/module"); + if (mid == object_id || mid == id__send__ || mid == idInitialize) { + rb_warn("removing `%s' may cause serious problems", rb_id2name(mid)); + } + + if (!st_lookup(RCLASS_M_TBL(klass), mid, &data) || + !(me = (rb_method_entry_t *)data) || + (!me->def || me->def->type == VM_METHOD_TYPE_UNDEF)) { + rb_name_error(mid, "method `%s' not defined in %s", + rb_id2name(mid), rb_class2name(klass)); + } + st_delete(RCLASS_M_TBL(klass), &mid, &data); + + rb_vm_check_redefinition_opt_method(me); + rb_clear_cache_for_undef(klass, mid); + rb_unlink_method_entry(me); + + CALL_METHOD_HOOK(klass, removed, mid); +} + +void +rb_remove_method_id(VALUE klass, ID mid) +{ + remove_method(klass, mid); +} + +void +rb_remove_method(VALUE klass, const char *name) +{ + remove_method(klass, rb_intern(name)); +} + +/* + * call-seq: + * remove_method(symbol) -> self + * + * Removes the method identified by _symbol_ from the current + * class. For an example, see <code>Module.undef_method</code>. + */ + +static VALUE +rb_mod_remove_method(int argc, VALUE *argv, VALUE mod) +{ + int i; + + for (i = 0; i < argc; i++) { + remove_method(mod, rb_to_id(argv[i])); + } + return mod; +} + +#undef rb_disable_super +#undef rb_enable_super + +void +rb_disable_super(VALUE klass, const char *name) +{ + /* obsolete - no use */ +} + +void +rb_enable_super(VALUE klass, const char *name) +{ + rb_warning("rb_enable_super() is obsolete"); +} + +static void +rb_export_method(VALUE klass, ID name, rb_method_flag_t noex) +{ + rb_method_entry_t *me; + + if (klass == rb_cObject) { + rb_secure(4); + } + + me = search_method(klass, name); + if (!me && TYPE(klass) == T_MODULE) { + me = search_method(rb_cObject, name); + } + + if (UNDEFINED_METHOD_ENTRY_P(me)) { + rb_print_undef(klass, name, 0); + } + + if (me->flag != noex) { + rb_vm_check_redefinition_opt_method(me); + + if (klass == me->klass) { + me->flag = noex; + } + else { + rb_add_method(klass, name, VM_METHOD_TYPE_ZSUPER, 0, noex); + } + } +} + +int +rb_method_boundp(VALUE klass, ID id, int ex) +{ + rb_method_entry_t *me = rb_method_entry(klass, id); + + if (me != 0) { + if ((ex & ~NOEX_RESPONDS) && (me->flag & NOEX_PRIVATE)) { + return FALSE; + } + if (!me->def) return 0; + if (me->def->type == VM_METHOD_TYPE_NOTIMPLEMENTED) { + if (ex & NOEX_RESPONDS) return 2; + return 0; + } + return 1; + } + return 0; +} + +void +rb_attr(VALUE klass, ID id, int read, int write, int ex) +{ + const char *name; + ID attriv; + VALUE aname; + rb_method_flag_t noex; + + if (!ex) { + noex = NOEX_PUBLIC; + } + else { + if (SCOPE_TEST(NOEX_PRIVATE)) { + noex = NOEX_PRIVATE; + rb_warning((SCOPE_CHECK(NOEX_MODFUNC)) ? + "attribute accessor as module_function" : + "private attribute?"); + } + else if (SCOPE_TEST(NOEX_PROTECTED)) { + noex = NOEX_PROTECTED; + } + else { + noex = NOEX_PUBLIC; + } + } + + if (!rb_is_local_id(id) && !rb_is_const_id(id)) { + rb_name_error(id, "invalid attribute name `%s'", rb_id2name(id)); + } + name = rb_id2name(id); + if (!name) { + rb_raise(rb_eArgError, "argument needs to be symbol or string"); + } + aname = rb_sprintf("@%s", name); + rb_enc_copy(aname, rb_id2str(id)); + attriv = rb_intern_str(aname); + if (read) { + rb_add_method(klass, id, VM_METHOD_TYPE_IVAR, (void *)attriv, noex); + } + if (write) { + rb_add_method(klass, rb_id_attrset(id), VM_METHOD_TYPE_ATTRSET, (void *)attriv, noex); + } +} + +void +rb_undef(VALUE klass, ID id) +{ + rb_method_entry_t *me; + + if (NIL_P(klass)) { + rb_raise(rb_eTypeError, "no class to undef method"); + } + if (rb_vm_cbase() == rb_cObject && klass == rb_cObject) { + rb_secure(4); + } + if (rb_safe_level() >= 4 && !OBJ_UNTRUSTED(klass)) { + rb_raise(rb_eSecurityError, "Insecure: can't undef `%s'", rb_id2name(id)); + } + rb_frozen_class_p(klass); + if (id == object_id || id == id__send__ || id == idInitialize) { + rb_warn("undefining `%s' may cause serious problems", rb_id2name(id)); + } + + me = search_method(klass, id); + + if (UNDEFINED_METHOD_ENTRY_P(me)) { + const char *s0 = " class"; + VALUE c = klass; + + if (FL_TEST(c, FL_SINGLETON)) { + VALUE obj = rb_ivar_get(klass, attached); + + switch (TYPE(obj)) { + case T_MODULE: + case T_CLASS: + c = obj; + s0 = ""; + } + } + else if (TYPE(c) == T_MODULE) { + s0 = " module"; + } + rb_name_error(id, "undefined method `%s' for%s `%s'", + rb_id2name(id), s0, rb_class2name(c)); + } + + rb_add_method(klass, id, VM_METHOD_TYPE_UNDEF, 0, NOEX_PUBLIC); + + CALL_METHOD_HOOK(klass, undefined, id); +} + +/* + * call-seq: + * undef_method(symbol) -> self + * + * Prevents the current class from responding to calls to the named + * method. Contrast this with <code>remove_method</code>, which deletes + * the method from the particular class; Ruby will still search + * superclasses and mixed-in modules for a possible receiver. + * + * class Parent + * def hello + * puts "In parent" + * end + * end + * class Child < Parent + * def hello + * puts "In child" + * end + * end + * + * + * c = Child.new + * c.hello + * + * + * class Child + * remove_method :hello # remove from child, still in parent + * end + * c.hello + * + * + * class Child + * undef_method :hello # prevent any calls to 'hello' + * end + * c.hello + * + * <em>produces:</em> + * + * In child + * In parent + * prog.rb:23: undefined method `hello' for #<Child:0x401b3bb4> (NoMethodError) + */ + +static VALUE +rb_mod_undef_method(int argc, VALUE *argv, VALUE mod) +{ + int i; + for (i = 0; i < argc; i++) { + rb_undef(mod, rb_to_id(argv[i])); + } + return mod; +} + +/* + * call-seq: + * mod.method_defined?(symbol) -> true or false + * + * Returns +true+ if the named method is defined by + * _mod_ (or its included modules and, if _mod_ is a class, + * its ancestors). Public and protected methods are matched. + * + * module A + * def method1() end + * end + * class B + * def method2() end + * end + * class C < B + * include A + * def method3() end + * end + * + * A.method_defined? :method1 #=> true + * C.method_defined? "method1" #=> true + * C.method_defined? "method2" #=> true + * C.method_defined? "method3" #=> true + * C.method_defined? "method4" #=> false + */ + +static VALUE +rb_mod_method_defined(VALUE mod, VALUE mid) +{ + if (!rb_method_boundp(mod, rb_to_id(mid), 1)) { + return Qfalse; + } + return Qtrue; + +} + +#define VISI_CHECK(x,f) (((x)&NOEX_MASK) == (f)) + +static VALUE +check_definition(VALUE mod, ID mid, rb_method_flag_t noex) +{ + const rb_method_entry_t *me; + me = rb_method_entry(mod, mid); + if (me) { + if (VISI_CHECK(me->flag, noex)) + return Qtrue; + } + return Qfalse; +} + +/* + * call-seq: + * mod.public_method_defined?(symbol) -> true or false + * + * Returns +true+ if the named public method is defined by + * _mod_ (or its included modules and, if _mod_ is a class, + * its ancestors). + * + * module A + * def method1() end + * end + * class B + * protected + * def method2() end + * end + * class C < B + * include A + * def method3() end + * end + * + * A.method_defined? :method1 #=> true + * C.public_method_defined? "method1" #=> true + * C.public_method_defined? "method2" #=> false + * C.method_defined? "method2" #=> true + */ + +static VALUE +rb_mod_public_method_defined(VALUE mod, VALUE mid) +{ + return check_definition(mod, rb_to_id(mid), NOEX_PUBLIC); +} + +/* + * call-seq: + * mod.private_method_defined?(symbol) -> true or false + * + * Returns +true+ if the named private method is defined by + * _ mod_ (or its included modules and, if _mod_ is a class, + * its ancestors). + * + * module A + * def method1() end + * end + * class B + * private + * def method2() end + * end + * class C < B + * include A + * def method3() end + * end + * + * A.method_defined? :method1 #=> true + * C.private_method_defined? "method1" #=> false + * C.private_method_defined? "method2" #=> true + * C.method_defined? "method2" #=> false + */ + +static VALUE +rb_mod_private_method_defined(VALUE mod, VALUE mid) +{ + return check_definition(mod, rb_to_id(mid), NOEX_PRIVATE); +} + +/* + * call-seq: + * mod.protected_method_defined?(symbol) -> true or false + * + * Returns +true+ if the named protected method is defined + * by _mod_ (or its included modules and, if _mod_ is a + * class, its ancestors). + * + * module A + * def method1() end + * end + * class B + * protected + * def method2() end + * end + * class C < B + * include A + * def method3() end + * end + * + * A.method_defined? :method1 #=> true + * C.protected_method_defined? "method1" #=> false + * C.protected_method_defined? "method2" #=> true + * C.method_defined? "method2" #=> true + */ + +static VALUE +rb_mod_protected_method_defined(VALUE mod, VALUE mid) +{ + return check_definition(mod, rb_to_id(mid), NOEX_PROTECTED); +} + +int +rb_method_entry_eq(const rb_method_entry_t *m1, const rb_method_entry_t *m2) +{ + return rb_method_definition_eq(m1->def, m2->def); +} + +static int +rb_method_definition_eq(const rb_method_definition_t *d1, const rb_method_definition_t *d2) +{ + if (d1 == d2) return 1; + if (!d1 || !d2) return 0; + if (d1->type != d2->type) { + return 0; + } + switch (d1->type) { + case VM_METHOD_TYPE_ISEQ: + return d1->body.iseq == d2->body.iseq; + case VM_METHOD_TYPE_CFUNC: + return + d1->body.cfunc.func == d2->body.cfunc.func && + d1->body.cfunc.argc == d2->body.cfunc.argc; + case VM_METHOD_TYPE_ATTRSET: + case VM_METHOD_TYPE_IVAR: + return d1->body.attr.id == d2->body.attr.id; + case VM_METHOD_TYPE_BMETHOD: + return RTEST(rb_equal(d1->body.proc, d2->body.proc)); + case VM_METHOD_TYPE_MISSING: + return d1->original_id == d2->original_id; + case VM_METHOD_TYPE_ZSUPER: + case VM_METHOD_TYPE_NOTIMPLEMENTED: + case VM_METHOD_TYPE_UNDEF: + return 1; + case VM_METHOD_TYPE_OPTIMIZED: + return d1->body.optimize_type == d2->body.optimize_type; + default: + rb_bug("rb_method_entry_eq: unsupported method type (%d)\n", d1->type); + return 0; + } +} + +void +rb_alias(VALUE klass, ID name, ID def) +{ + VALUE target_klass = klass; + rb_method_entry_t *orig_me; + rb_method_flag_t flag = NOEX_UNDEF; + + if (NIL_P(klass)) { + rb_raise(rb_eTypeError, "no class to make alias"); + } + + rb_frozen_class_p(klass); + if (klass == rb_cObject) { + rb_secure(4); + } + + again: + orig_me = search_method(klass, def); + + if (UNDEFINED_METHOD_ENTRY_P(orig_me)) { + if ((TYPE(klass) != T_MODULE) || + (orig_me = search_method(rb_cObject, def), UNDEFINED_METHOD_ENTRY_P(orig_me))) { + rb_print_undef(klass, def, 0); + } + } + if (orig_me->def->type == VM_METHOD_TYPE_ZSUPER) { + klass = RCLASS_SUPER(klass); + def = orig_me->def->original_id; + flag = orig_me->flag; + goto again; + } + + if (flag == NOEX_UNDEF) flag = orig_me->flag; + rb_method_entry_set(target_klass, name, orig_me, flag); +} + +/* + * 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; +} + +static void +secure_visibility(VALUE self) +{ + if (rb_safe_level() >= 4 && !OBJ_UNTRUSTED(self)) { + rb_raise(rb_eSecurityError, + "Insecure: can't change method visibility"); + } +} + +static void +set_method_visibility(VALUE self, int argc, VALUE *argv, rb_method_flag_t ex) +{ + int i; + secure_visibility(self); + for (i = 0; i < argc; i++) { + rb_export_method(self, rb_to_id(argv[i]), ex); + } + rb_clear_cache_by_class(self); +} + +/* + * call-seq: + * public -> self + * public(symbol, ...) -> self + * + * With no arguments, sets the default visibility for subsequently + * defined methods to public. With arguments, sets the named methods to + * have public visibility. + */ + +static VALUE +rb_mod_public(int argc, VALUE *argv, VALUE module) +{ + secure_visibility(module); + if (argc == 0) { + SCOPE_SET(NOEX_PUBLIC); + } + else { + set_method_visibility(module, argc, argv, NOEX_PUBLIC); + } + return module; +} + +/* + * call-seq: + * protected -> self + * protected(symbol, ...) -> self + * + * With no arguments, sets the default visibility for subsequently + * defined methods to protected. With arguments, sets the named methods + * to have protected visibility. + */ + +static VALUE +rb_mod_protected(int argc, VALUE *argv, VALUE module) +{ + secure_visibility(module); + if (argc == 0) { + SCOPE_SET(NOEX_PROTECTED); + } + else { + set_method_visibility(module, argc, argv, NOEX_PROTECTED); + } + return module; +} + +/* + * call-seq: + * private -> self + * private(symbol, ...) -> self + * + * With no arguments, sets the default visibility for subsequently + * defined methods to private. With arguments, sets the named methods + * to have private visibility. + * + * module Mod + * def a() end + * def b() end + * private + * def c() end + * private :a + * end + * Mod.private_instance_methods #=> [:a, :c] + */ + +static VALUE +rb_mod_private(int argc, VALUE *argv, VALUE module) +{ + secure_visibility(module); + if (argc == 0) { + SCOPE_SET(NOEX_PRIVATE); + } + else { + set_method_visibility(module, argc, argv, NOEX_PRIVATE); + } + return module; +} + +/* + * call-seq: + * mod.public_class_method(symbol, ...) -> mod + * + * Makes a list of existing class methods public. + */ + +static VALUE +rb_mod_public_method(int argc, VALUE *argv, VALUE obj) +{ + set_method_visibility(CLASS_OF(obj), argc, argv, NOEX_PUBLIC); + return obj; +} + +/* + * call-seq: + * mod.private_class_method(symbol, ...) -> mod + * + * Makes existing class methods private. Often used to hide the default + * constructor <code>new</code>. + * + * class SimpleSingleton # Not thread safe + * private_class_method :new + * def SimpleSingleton.create(*args, &block) + * @me = new(*args, &block) if ! @me + * @me + * end + * end + */ + +static VALUE +rb_mod_private_method(int argc, VALUE *argv, VALUE obj) +{ + set_method_visibility(CLASS_OF(obj), argc, argv, NOEX_PRIVATE); + return obj; +} + +/* + * call-seq: + * public + * public(symbol, ...) + * + * With no arguments, sets the default visibility for subsequently + * defined methods to public. With arguments, sets the named methods to + * have public visibility. + */ + +static VALUE +top_public(int argc, VALUE *argv) +{ + return rb_mod_public(argc, argv, rb_cObject); +} + +static VALUE +top_private(int argc, VALUE *argv) +{ + return rb_mod_private(argc, argv, rb_cObject); +} + +/* + * call-seq: + * module_function(symbol, ...) -> self + * + * Creates module functions for the named methods. These functions may + * be called with the module as a receiver, and also become available + * as instance methods to classes that mix in the module. Module + * functions are copies of the original, and so may be changed + * independently. The instance-method versions are made private. If + * used with no arguments, subsequently defined methods become module + * functions. + * + * module Mod + * def one + * "This is one" + * end + * module_function :one + * end + * class Cls + * include Mod + * def callOne + * one + * end + * end + * Mod.one #=> "This is one" + * c = Cls.new + * c.callOne #=> "This is one" + * module Mod + * def one + * "This is the new one" + * end + * end + * Mod.one #=> "This is one" + * c.callOne #=> "This is the new one" + */ + +static VALUE +rb_mod_modfunc(int argc, VALUE *argv, VALUE module) +{ + int i; + ID id; + const rb_method_entry_t *me; + + if (TYPE(module) != T_MODULE) { + rb_raise(rb_eTypeError, "module_function must be called for modules"); + } + + secure_visibility(module); + if (argc == 0) { + SCOPE_SET(NOEX_MODFUNC); + return module; + } + + set_method_visibility(module, argc, argv, NOEX_PRIVATE); + + for (i = 0; i < argc; i++) { + VALUE m = module; + + id = rb_to_id(argv[i]); + for (;;) { + me = search_method(m, id); + if (me == 0) { + me = search_method(rb_cObject, id); + } + if (UNDEFINED_METHOD_ENTRY_P(me)) { + rb_print_undef(module, id, 0); + } + if (me->def->type != VM_METHOD_TYPE_ZSUPER) { + break; /* normal case: need not to follow 'super' link */ + } + m = RCLASS_SUPER(m); + if (!m) + break; + } + rb_method_entry_set(rb_singleton_class(module), id, me, NOEX_PUBLIC); + } + return module; +} + +int +rb_method_basic_definition_p(VALUE klass, ID id) +{ + const rb_method_entry_t *me = rb_method_entry(klass, id); + if (me && (me->flag & NOEX_BASIC)) + return 1; + return 0; +} + +static inline int +basic_obj_respond_to(VALUE obj, ID id, int pub) +{ + VALUE klass = CLASS_OF(obj); + + switch (rb_method_boundp(klass, id, pub|NOEX_RESPONDS)) { + case 2: + return FALSE; + case 0: + return RTEST(rb_funcall(obj, respond_to_missing, 2, ID2SYM(id), pub ? Qfalse : Qtrue)); + default: + return TRUE; + } +} + +int +rb_obj_respond_to(VALUE obj, ID id, int priv) +{ + VALUE klass = CLASS_OF(obj); + + if (rb_method_basic_definition_p(klass, idRespond_to)) { + return basic_obj_respond_to(obj, id, !RTEST(priv)); + } + else { + return RTEST(rb_funcall(obj, idRespond_to, priv ? 2 : 1, ID2SYM(id), Qtrue)); + } +} + +int +rb_respond_to(VALUE obj, ID id) +{ + return rb_obj_respond_to(obj, id, FALSE); +} + + +/* + * call-seq: + * obj.respond_to?(symbol, include_private=false) -> true or false + * + * Returns +true+ if _obj_ responds to the given + * method. Private methods are included in the search only if the + * optional second parameter evaluates to +true+. + * + * If the method is not implemented, + * as Process.fork on Windows, File.lchmod on GNU/Linux, etc., + * false is returned. + * + * If the method is not defined, <code>respond_to_missing?</code> + * method is called and the result is returned. + */ + +static VALUE +obj_respond_to(int argc, VALUE *argv, VALUE obj) +{ + VALUE mid, priv; + ID id; + + rb_scan_args(argc, argv, "11", &mid, &priv); + id = rb_to_id(mid); + if (basic_obj_respond_to(obj, id, !RTEST(priv))) + return Qtrue; + return Qfalse; +} + +/* + * call-seq: + * obj.respond_to_missing?(symbol, include_private) -> true or false + * + * Hook method to return whether the _obj_ can respond to _id_ method + * or not. + * + * See #respond_to?. + */ +static VALUE +obj_respond_to_missing(VALUE obj, VALUE priv) +{ + return Qfalse; +} + +void +Init_eval_method(void) +{ +#undef rb_intern +#define rb_intern(str) rb_intern_const(str) + + rb_define_method(rb_mKernel, "respond_to?", obj_respond_to, -1); + rb_define_method(rb_mKernel, "respond_to_missing?", obj_respond_to_missing, 2); + + rb_define_private_method(rb_cModule, "remove_method", rb_mod_remove_method, -1); + rb_define_private_method(rb_cModule, "undef_method", rb_mod_undef_method, -1); + rb_define_private_method(rb_cModule, "alias_method", rb_mod_alias_method, 2); + rb_define_private_method(rb_cModule, "public", rb_mod_public, -1); + rb_define_private_method(rb_cModule, "protected", rb_mod_protected, -1); + rb_define_private_method(rb_cModule, "private", rb_mod_private, -1); + rb_define_private_method(rb_cModule, "module_function", rb_mod_modfunc, -1); + + rb_define_method(rb_cModule, "method_defined?", rb_mod_method_defined, 1); + rb_define_method(rb_cModule, "public_method_defined?", rb_mod_public_method_defined, 1); + rb_define_method(rb_cModule, "private_method_defined?", rb_mod_private_method_defined, 1); + rb_define_method(rb_cModule, "protected_method_defined?", rb_mod_protected_method_defined, 1); + rb_define_method(rb_cModule, "public_class_method", rb_mod_public_method, -1); + rb_define_method(rb_cModule, "private_class_method", rb_mod_private_method, -1); + + rb_define_singleton_method(rb_vm_top_self(), "public", top_public, -1); + rb_define_singleton_method(rb_vm_top_self(), "private", top_private, -1); + + object_id = rb_intern("object_id"); + added = rb_intern("method_added"); + singleton_added = rb_intern("singleton_method_added"); + removed = rb_intern("method_removed"); + singleton_removed = rb_intern("singleton_method_removed"); + undefined = rb_intern("method_undefined"); + singleton_undefined = rb_intern("singleton_method_undefined"); + attached = rb_intern("__attached__"); + respond_to_missing = rb_intern("respond_to_missing?"); +} + |