diff options
Diffstat (limited to 'vm_method.c')
| -rw-r--r-- | vm_method.c | 2143 |
1 files changed, 2143 insertions, 0 deletions
diff --git a/vm_method.c b/vm_method.c new file mode 100644 index 0000000000..30561d3d4b --- /dev/null +++ b/vm_method.c @@ -0,0 +1,2143 @@ +/* + * This file is included by vm.c + */ + +#include "id_table.h" + +#define METHOD_DEBUG 0 + +#if OPT_GLOBAL_METHOD_CACHE +#ifndef GLOBAL_METHOD_CACHE_SIZE +#define GLOBAL_METHOD_CACHE_SIZE 0x800 +#endif +#define LSB_ONLY(x) ((x) & ~((x) - 1)) +#define POWER_OF_2_P(x) ((x) == LSB_ONLY(x)) +#if !POWER_OF_2_P(GLOBAL_METHOD_CACHE_SIZE) +# error GLOBAL_METHOD_CACHE_SIZE must be power of 2 +#endif +#ifndef GLOBAL_METHOD_CACHE_MASK +#define GLOBAL_METHOD_CACHE_MASK (GLOBAL_METHOD_CACHE_SIZE-1) +#endif + +#define GLOBAL_METHOD_CACHE_KEY(c,m) ((((c)>>3)^(m))&(global_method_cache.mask)) +#define GLOBAL_METHOD_CACHE(c,m) (global_method_cache.entries + GLOBAL_METHOD_CACHE_KEY(c,m)) +#else +#define GLOBAL_METHOD_CACHE(c,m) (rb_bug("global method cache disabled improperly"), NULL) +#endif + +static int vm_redefinition_check_flag(VALUE klass); +static void rb_vm_check_redefinition_opt_method(const rb_method_entry_t *me, VALUE klass); + +#define object_id idObject_id +#define added idMethod_added +#define singleton_added idSingleton_method_added +#define removed idMethod_removed +#define singleton_removed idSingleton_method_removed +#define undefined idMethod_undefined +#define singleton_undefined idSingleton_method_undefined +#define attached id__attached__ + +struct cache_entry { + rb_serial_t method_state; + rb_serial_t class_serial; + ID mid; + rb_method_entry_t* me; + VALUE defined_class; +}; + +#if OPT_GLOBAL_METHOD_CACHE +static struct { + unsigned int size; + unsigned int mask; + struct cache_entry *entries; +} global_method_cache = { + GLOBAL_METHOD_CACHE_SIZE, + GLOBAL_METHOD_CACHE_MASK, +}; +#endif + +#define ruby_running (GET_VM()->running) +/* int ruby_running = 0; */ + +static void +rb_class_clear_method_cache(VALUE klass, VALUE arg) +{ + RCLASS_SERIAL(klass) = rb_next_class_serial(); + + if (RB_TYPE_P(klass, T_ICLASS)) { + struct rb_id_table *table = RCLASS_CALLABLE_M_TBL(klass); + if (table) { + rb_id_table_clear(table); + } + } + else { + if (RCLASS_CALLABLE_M_TBL(klass) != 0) { + rb_obj_info_dump(klass); + rb_bug("RCLASS_CALLABLE_M_TBL(klass) != 0"); + } + } + + rb_class_foreach_subclass(klass, rb_class_clear_method_cache, arg); +} + +void +rb_clear_constant_cache(void) +{ + INC_GLOBAL_CONSTANT_STATE(); +} + +void +rb_clear_method_cache_by_class(VALUE klass) +{ + if (klass && klass != Qundef) { + int global = klass == rb_cBasicObject || klass == rb_cObject || klass == rb_mKernel; + + RUBY_DTRACE_HOOK(METHOD_CACHE_CLEAR, (global ? "global" : rb_class2name(klass))); + + if (global) { + INC_GLOBAL_METHOD_STATE(); + } + else { + rb_class_clear_method_cache(klass, Qnil); + } + } + + if (klass == rb_mKernel) { + rb_subclass_entry_t *entry = RCLASS_EXT(klass)->subclasses; + + for (; entry != NULL; entry = entry->next) { + struct rb_id_table *table = RCLASS_CALLABLE_M_TBL(entry->klass); + if (table)rb_id_table_clear(table); + } + } +} + +VALUE +rb_f_notimplement(int argc, const VALUE *argv, VALUE obj) +{ + rb_notimplement(); + + UNREACHABLE; +} + +static void +rb_define_notimplement_method_id(VALUE mod, ID id, rb_method_visibility_t visi) +{ + rb_add_method(mod, id, VM_METHOD_TYPE_NOTIMPLEMENTED, (void *)1, visi); +} + +void +rb_add_method_cfunc(VALUE klass, ID mid, VALUE (*func)(ANYARGS), int argc, rb_method_visibility_t visi) +{ + if (argc < -2 || 15 < argc) rb_raise(rb_eArgError, "arity out of range: %d for -2..15", argc); + 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, visi); + } + else { + rb_define_notimplement_method_id(klass, mid, visi); + } +} + +static void +rb_method_definition_release(rb_method_definition_t *def, int complemented) +{ + if (def != NULL) { + const int alias_count = def->alias_count; + const int complemented_count = def->complemented_count; + VM_ASSERT(alias_count >= 0); + VM_ASSERT(complemented_count >= 0); + + if (alias_count + complemented_count == 0) { + if (METHOD_DEBUG) fprintf(stderr, "-%p-%s:%d,%d (remove)\n", def, rb_id2name(def->original_id), alias_count, complemented_count); + xfree(def); + } + else { + if (complemented) def->complemented_count--; + else if (def->alias_count > 0) def->alias_count--; + + if (METHOD_DEBUG) fprintf(stderr, "-%p-%s:%d->%d,%d->%d (dec)\n", def, rb_id2name(def->original_id), + alias_count, def->alias_count, complemented_count, def->complemented_count); + } + } +} + +void +rb_free_method_entry(const rb_method_entry_t *me) +{ + rb_method_definition_release(me->def, METHOD_ENTRY_COMPLEMENTED(me)); +} + +static inline rb_method_entry_t *search_method(VALUE klass, ID id, VALUE *defined_class_ptr); +static int rb_method_definition_eq(const rb_method_definition_t *d1, const rb_method_definition_t *d2); + +static inline rb_method_entry_t * +lookup_method_table(VALUE klass, ID id) +{ + st_data_t body; + struct rb_id_table *m_tbl = RCLASS_M_TBL(klass); + + if (rb_id_table_lookup(m_tbl, id, &body)) { + return (rb_method_entry_t *) body; + } + else { + return 0; + } +} + +static VALUE +(*call_cfunc_invoker_func(int argc))(VALUE (*func)(ANYARGS), VALUE recv, int argc, const VALUE *) +{ + switch (argc) { + case -2: return &call_cfunc_m2; + case -1: return &call_cfunc_m1; + case 0: return &call_cfunc_0; + case 1: return &call_cfunc_1; + case 2: return &call_cfunc_2; + case 3: return &call_cfunc_3; + case 4: return &call_cfunc_4; + case 5: return &call_cfunc_5; + case 6: return &call_cfunc_6; + case 7: return &call_cfunc_7; + case 8: return &call_cfunc_8; + case 9: return &call_cfunc_9; + case 10: return &call_cfunc_10; + case 11: return &call_cfunc_11; + case 12: return &call_cfunc_12; + case 13: return &call_cfunc_13; + case 14: return &call_cfunc_14; + case 15: return &call_cfunc_15; + default: + rb_bug("call_cfunc_func: unsupported length: %d", argc); + } +} + +static void +setup_method_cfunc_struct(rb_method_cfunc_t *cfunc, VALUE (*func)(), int argc) +{ + cfunc->func = func; + cfunc->argc = argc; + cfunc->invoker = call_cfunc_invoker_func(argc); +} + +static void +method_definition_set(const rb_method_entry_t *me, rb_method_definition_t *def, void *opts) +{ + *(rb_method_definition_t **)&me->def = def; + + if (opts != NULL) { + switch (def->type) { + case VM_METHOD_TYPE_ISEQ: + { + rb_method_iseq_t *iseq_body = (rb_method_iseq_t *)opts; + rb_cref_t *method_cref, *cref = iseq_body->cref; + + /* setup iseq first (before invoking GC) */ + RB_OBJ_WRITE(me, &def->body.iseq.iseqptr, iseq_body->iseqptr); + + if (0) vm_cref_dump("rb_method_definition_create", cref); + + if (cref) { + method_cref = cref; + } + else { + method_cref = vm_cref_new_toplevel(GET_EC()); /* TODO: can we reuse? */ + } + + RB_OBJ_WRITE(me, &def->body.iseq.cref, method_cref); + return; + } + case VM_METHOD_TYPE_CFUNC: + { + rb_method_cfunc_t *cfunc = (rb_method_cfunc_t *)opts; + setup_method_cfunc_struct(UNALIGNED_MEMBER_PTR(def, body.cfunc), cfunc->func, cfunc->argc); + return; + } + case VM_METHOD_TYPE_ATTRSET: + case VM_METHOD_TYPE_IVAR: + { + const rb_execution_context_t *ec = GET_EC(); + rb_control_frame_t *cfp; + int line; + + def->body.attr.id = (ID)(VALUE)opts; + + cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp); + + if (cfp && (line = rb_vm_get_sourceline(cfp))) { + VALUE location = rb_ary_new3(2, rb_iseq_path(cfp->iseq), INT2FIX(line)); + RB_OBJ_WRITE(me, &def->body.attr.location, rb_ary_freeze(location)); + } + else { + VM_ASSERT(def->body.attr.location == 0); + } + return; + } + case VM_METHOD_TYPE_BMETHOD: + RB_OBJ_WRITE(me, &def->body.proc, (VALUE)opts); + return; + case VM_METHOD_TYPE_NOTIMPLEMENTED: + setup_method_cfunc_struct(UNALIGNED_MEMBER_PTR(def, body.cfunc), rb_f_notimplement, -1); + return; + case VM_METHOD_TYPE_OPTIMIZED: + def->body.optimize_type = (enum method_optimized_type)opts; + return; + case VM_METHOD_TYPE_REFINED: + { + const rb_method_refined_t *refined = (rb_method_refined_t *)opts; + RB_OBJ_WRITE(me, &def->body.refined.orig_me, refined->orig_me); + RB_OBJ_WRITE(me, &def->body.refined.owner, refined->owner); + return; + } + case VM_METHOD_TYPE_ALIAS: + RB_OBJ_WRITE(me, &def->body.alias.original_me, (rb_method_entry_t *)opts); + return; + case VM_METHOD_TYPE_ZSUPER: + case VM_METHOD_TYPE_UNDEF: + case VM_METHOD_TYPE_MISSING: + return; + } + } +} + +static void +method_definition_reset(const rb_method_entry_t *me) +{ + rb_method_definition_t *def = me->def; + + switch(def->type) { + case VM_METHOD_TYPE_ISEQ: + RB_OBJ_WRITTEN(me, Qundef, def->body.iseq.iseqptr); + RB_OBJ_WRITTEN(me, Qundef, def->body.iseq.cref); + break; + case VM_METHOD_TYPE_ATTRSET: + case VM_METHOD_TYPE_IVAR: + RB_OBJ_WRITTEN(me, Qundef, def->body.attr.location); + break; + case VM_METHOD_TYPE_BMETHOD: + RB_OBJ_WRITTEN(me, Qundef, def->body.proc); + break; + case VM_METHOD_TYPE_REFINED: + RB_OBJ_WRITTEN(me, Qundef, def->body.refined.orig_me); + RB_OBJ_WRITTEN(me, Qundef, def->body.refined.owner); + break; + case VM_METHOD_TYPE_ALIAS: + RB_OBJ_WRITTEN(me, Qundef, def->body.alias.original_me); + break; + case VM_METHOD_TYPE_CFUNC: + case VM_METHOD_TYPE_ZSUPER: + case VM_METHOD_TYPE_MISSING: + case VM_METHOD_TYPE_OPTIMIZED: + case VM_METHOD_TYPE_UNDEF: + case VM_METHOD_TYPE_NOTIMPLEMENTED: + break; + } +} + +static rb_method_definition_t * +method_definition_create(rb_method_type_t type, ID mid) +{ + rb_method_definition_t *def; + def = ZALLOC(rb_method_definition_t); + def->type = type; + def->original_id = mid; + return def; +} + +static rb_method_definition_t * +method_definition_addref(rb_method_definition_t *def) +{ + def->alias_count++; + if (METHOD_DEBUG) fprintf(stderr, "+%p-%s:%d\n", def, rb_id2name(def->original_id), def->alias_count); + return def; +} + +static rb_method_definition_t * +method_definition_addref_complement(rb_method_definition_t *def) +{ + def->complemented_count++; + if (METHOD_DEBUG) fprintf(stderr, "+%p-%s:%d\n", def, rb_id2name(def->original_id), def->complemented_count); + return def; +} + +static rb_method_entry_t * +rb_method_entry_alloc(ID called_id, VALUE owner, VALUE defined_class, const rb_method_definition_t *def) +{ + rb_method_entry_t *me = (rb_method_entry_t *)rb_imemo_new(imemo_ment, (VALUE)def, (VALUE)called_id, owner, defined_class); + return me; +} + +static VALUE +filter_defined_class(VALUE klass) +{ + switch (BUILTIN_TYPE(klass)) { + case T_CLASS: + return klass; + case T_MODULE: + return 0; + case T_ICLASS: + break; + } + rb_bug("filter_defined_class: %s", rb_obj_info(klass)); +} + +rb_method_entry_t * +rb_method_entry_create(ID called_id, VALUE klass, rb_method_visibility_t visi, const rb_method_definition_t *def) +{ + rb_method_entry_t *me = rb_method_entry_alloc(called_id, klass, filter_defined_class(klass), def); + METHOD_ENTRY_FLAGS_SET(me, visi, ruby_running ? FALSE : TRUE); + if (def != NULL) method_definition_reset(me); + return me; +} + +const rb_method_entry_t * +rb_method_entry_clone(const rb_method_entry_t *src_me) +{ + rb_method_entry_t *me = rb_method_entry_alloc(src_me->called_id, src_me->owner, src_me->defined_class, + method_definition_addref(src_me->def)); + METHOD_ENTRY_FLAGS_COPY(me, src_me); + return me; +} + +const rb_callable_method_entry_t * +rb_method_entry_complement_defined_class(const rb_method_entry_t *src_me, ID called_id, VALUE defined_class) +{ + rb_method_definition_t *def = src_me->def; + rb_method_entry_t *me; + struct { + const struct rb_method_entry_struct *orig_me; + VALUE owner; + } refined = {0}; + + if (!src_me->defined_class && + def->type == VM_METHOD_TYPE_REFINED && + def->body.refined.orig_me) { + const rb_method_entry_t *orig_me = + rb_method_entry_clone(def->body.refined.orig_me); + RB_OBJ_WRITE((VALUE)orig_me, &orig_me->defined_class, defined_class); + refined.orig_me = orig_me; + refined.owner = orig_me->owner; + def = NULL; + } + else { + def = method_definition_addref_complement(def); + } + me = rb_method_entry_alloc(called_id, src_me->owner, defined_class, def); + METHOD_ENTRY_FLAGS_COPY(me, src_me); + METHOD_ENTRY_COMPLEMENTED_SET(me); + if (!def) { + def = method_definition_create(VM_METHOD_TYPE_REFINED, called_id); + method_definition_set(me, def, &refined); + } + + VM_ASSERT(RB_TYPE_P(me->owner, T_MODULE)); + + return (rb_callable_method_entry_t *)me; +} + +void +rb_method_entry_copy(rb_method_entry_t *dst, const rb_method_entry_t *src) +{ + *(rb_method_definition_t **)&dst->def = method_definition_addref(src->def); + method_definition_reset(dst); + dst->called_id = src->called_id; + RB_OBJ_WRITE((VALUE)dst, &dst->owner, src->owner); + RB_OBJ_WRITE((VALUE)dst, &dst->defined_class, src->defined_class); + METHOD_ENTRY_FLAGS_COPY(dst, src); +} + +static void +make_method_entry_refined(VALUE owner, rb_method_entry_t *me) +{ + if (me->def->type == VM_METHOD_TYPE_REFINED) { + return; + } + else { + struct { + struct rb_method_entry_struct *orig_me; + VALUE owner; + } refined; + + rb_vm_check_redefinition_opt_method(me, me->owner); + + refined.orig_me = + rb_method_entry_alloc(me->called_id, me->owner, + me->defined_class ? + me->defined_class : owner, + method_definition_addref(me->def)); + METHOD_ENTRY_FLAGS_COPY(refined.orig_me, me); + refined.owner = owner; + + method_definition_set(me, method_definition_create(VM_METHOD_TYPE_REFINED, me->called_id), (void *)&refined); + METHOD_ENTRY_VISI_SET(me, METHOD_VISI_PUBLIC); + } +} + +void +rb_add_refined_method_entry(VALUE refined_class, ID mid) +{ + rb_method_entry_t *me = lookup_method_table(refined_class, mid); + + if (me) { + make_method_entry_refined(refined_class, me); + rb_clear_method_cache_by_class(refined_class); + } + else { + rb_add_method(refined_class, mid, VM_METHOD_TYPE_REFINED, 0, METHOD_VISI_PUBLIC); + } +} + +static void +check_override_opt_method(VALUE klass, VALUE arg) +{ + ID mid = (ID)arg; + const rb_method_entry_t *me, *newme; + + if (vm_redefinition_check_flag(klass)) { + me = lookup_method_table(RCLASS_ORIGIN(klass), mid); + if (me) { + newme = rb_method_entry(klass, mid); + if (newme != me) rb_vm_check_redefinition_opt_method(me, me->owner); + } + } + rb_class_foreach_subclass(klass, check_override_opt_method, (VALUE)mid); +} + +/* + * klass->method_table[mid] = method_entry(defined_class, visi, def) + * + * If def is given (!= NULL), then just use it and ignore original_id and otps. + * If not given, then make a new def with original_id and opts. + */ +static rb_method_entry_t * +rb_method_entry_make(VALUE klass, ID mid, VALUE defined_class, rb_method_visibility_t visi, + rb_method_type_t type, rb_method_definition_t *def, ID original_id, void *opts) +{ + rb_method_entry_t *me; + struct rb_id_table *mtbl; + st_data_t data; + int make_refined = 0; + + if (NIL_P(klass)) { + klass = rb_cObject; + } + if (!FL_TEST(klass, FL_SINGLETON) && + type != VM_METHOD_TYPE_NOTIMPLEMENTED && + type != VM_METHOD_TYPE_ZSUPER) { + switch (mid) { + case idInitialize: + case idInitialize_copy: + case idInitialize_clone: + case idInitialize_dup: + case idRespond_to_missing: + visi = METHOD_VISI_PRIVATE; + } + } + + rb_frozen_class_p(klass); + + if (FL_TEST(klass, RMODULE_IS_REFINEMENT)) { + VALUE refined_class = rb_refinement_module_get_refined_class(klass); + rb_add_refined_method_entry(refined_class, mid); + } + if (type == VM_METHOD_TYPE_REFINED) { + rb_method_entry_t *old_me = lookup_method_table(RCLASS_ORIGIN(klass), mid); + if (old_me) rb_vm_check_redefinition_opt_method(old_me, klass); + } + else { + klass = RCLASS_ORIGIN(klass); + } + mtbl = RCLASS_M_TBL(klass); + + /* check re-definition */ + if (rb_id_table_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, klass); + + if (old_def->type == VM_METHOD_TYPE_REFINED) make_refined = 1; + + if (RTEST(ruby_verbose) && + type != VM_METHOD_TYPE_UNDEF && + (old_def->alias_count == 0) && + !make_refined && + old_def->type != VM_METHOD_TYPE_UNDEF && + old_def->type != VM_METHOD_TYPE_ZSUPER && + old_def->type != VM_METHOD_TYPE_ALIAS) { + const rb_iseq_t *iseq = 0; + + rb_warning("method redefined; discarding old %"PRIsVALUE, rb_id2str(mid)); + switch (old_def->type) { + case VM_METHOD_TYPE_ISEQ: + iseq = def_iseq_ptr(old_def); + break; + case VM_METHOD_TYPE_BMETHOD: + iseq = rb_proc_get_iseq(old_def->body.proc, 0); + break; + default: + break; + } + if (iseq) { + rb_compile_warning(RSTRING_PTR(rb_iseq_path(iseq)), + FIX2INT(iseq->body->location.first_lineno), + "previous definition of %"PRIsVALUE" was here", + rb_id2str(old_def->original_id)); + } + } + } + + /* create method entry */ + me = rb_method_entry_create(mid, defined_class, visi, NULL); + if (def == NULL) def = method_definition_create(type, original_id); + method_definition_set(me, def, opts); + + rb_clear_method_cache_by_class(klass); + + /* 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 && search_method(klass, mid, 0)) { + rb_warn("redefining `%s' may cause serious problems", rb_id2name(mid)); + } + } + + if (make_refined) { + make_method_entry_refined(klass, me); + } + + rb_id_table_insert(mtbl, mid, (VALUE)me); + RB_OBJ_WRITTEN(klass, Qundef, (VALUE)me); + + VM_ASSERT(me->def != NULL); + + /* check optimized method override by a prepended module */ + if (RB_TYPE_P(klass, T_MODULE)) { + check_override_opt_method(klass, (VALUE)mid); + } + + 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_funcallv(recv_class, hook_id, 1, &arg); \ + } while (0) + +static void +method_added(VALUE klass, ID mid) +{ + if (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_visibility_t visi) +{ + rb_method_entry_t *me = rb_method_entry_make(klass, mid, klass, visi, type, NULL, mid, opts); + + if (type != VM_METHOD_TYPE_UNDEF && type != VM_METHOD_TYPE_REFINED) { + method_added(klass, mid); + } + + return me; +} + +void +rb_add_method_iseq(VALUE klass, ID mid, const rb_iseq_t *iseq, rb_cref_t *cref, rb_method_visibility_t visi) +{ + struct { /* should be same fields with rb_method_iseq_struct */ + const rb_iseq_t *iseqptr; + rb_cref_t *cref; + } iseq_body; + + iseq_body.iseqptr = iseq; + iseq_body.cref = cref; + rb_add_method(klass, mid, VM_METHOD_TYPE_ISEQ, &iseq_body, visi); +} + +static rb_method_entry_t * +method_entry_set(VALUE klass, ID mid, const rb_method_entry_t *me, + rb_method_visibility_t visi, VALUE defined_class) +{ + rb_method_entry_t *newme = rb_method_entry_make(klass, mid, defined_class, visi, + me->def->type, method_definition_addref(me->def), 0, NULL); + method_added(klass, mid); + return newme; +} + +rb_method_entry_t * +rb_method_entry_set(VALUE klass, ID mid, const rb_method_entry_t *me, rb_method_visibility_t visi) +{ + return method_entry_set(klass, mid, me, visi, klass); +} + +#define UNDEF_ALLOC_FUNC ((rb_alloc_func_t)-1) + +void +rb_define_alloc_func(VALUE klass, VALUE (*func)(VALUE)) +{ + Check_Type(klass, T_CLASS); + RCLASS_EXT(klass)->allocator = func; +} + +void +rb_undef_alloc_func(VALUE klass) +{ + rb_define_alloc_func(klass, UNDEF_ALLOC_FUNC); +} + +rb_alloc_func_t +rb_get_alloc_func(VALUE klass) +{ + Check_Type(klass, T_CLASS); + + for (; klass; klass = RCLASS_SUPER(klass)) { + rb_alloc_func_t allocator = RCLASS_EXT(klass)->allocator; + if (allocator == UNDEF_ALLOC_FUNC) break; + if (allocator) return allocator; + } + return 0; +} + +static inline rb_method_entry_t* +search_method(VALUE klass, ID id, VALUE *defined_class_ptr) +{ + rb_method_entry_t *me; + + for (me = 0; klass; klass = RCLASS_SUPER(klass)) { + RB_DEBUG_COUNTER_INC(mc_search_super); + if ((me = lookup_method_table(klass, id)) != 0) break; + } + + if (defined_class_ptr) + *defined_class_ptr = klass; + return me; +} + +const rb_method_entry_t * +rb_method_entry_at(VALUE klass, ID id) +{ + return lookup_method_table(klass, id); +} + +/* + * search method entry without the method cache. + * + * if you need method entry with method cache (normal case), use + * rb_method_entry() simply. + */ +static rb_method_entry_t * +method_entry_get_without_cache(VALUE klass, ID id, + VALUE *defined_class_ptr) +{ + VALUE defined_class; + rb_method_entry_t *me = search_method(klass, id, &defined_class); + + if (ruby_running) { + if (OPT_GLOBAL_METHOD_CACHE) { + struct cache_entry *ent; + ent = GLOBAL_METHOD_CACHE(klass, id); + ent->class_serial = RCLASS_SERIAL(klass); + ent->method_state = GET_GLOBAL_METHOD_STATE(); + ent->defined_class = defined_class; + ent->mid = id; + + if (UNDEFINED_METHOD_ENTRY_P(me)) { + me = ent->me = NULL; + } + else { + ent->me = me; + } + } + else if (UNDEFINED_METHOD_ENTRY_P(me)) { + me = NULL; + } + } + else if (UNDEFINED_METHOD_ENTRY_P(me)) { + me = NULL; + } + + if (defined_class_ptr) + *defined_class_ptr = defined_class; + return me; +} + +#if VM_DEBUG_VERIFY_METHOD_CACHE +static void +verify_method_cache(VALUE klass, ID id, VALUE defined_class, rb_method_entry_t *me) +{ + VALUE actual_defined_class; + rb_method_entry_t *actual_me = + method_entry_get_without_cache(klass, id, &actual_defined_class); + + if (me != actual_me || defined_class != actual_defined_class) { + rb_bug("method cache verification failed"); + } +} +#endif + +static rb_method_entry_t * +method_entry_get(VALUE klass, ID id, VALUE *defined_class_ptr) +{ +#if OPT_GLOBAL_METHOD_CACHE + struct cache_entry *ent; + ent = GLOBAL_METHOD_CACHE(klass, id); + if (ent->method_state == GET_GLOBAL_METHOD_STATE() && + ent->class_serial == RCLASS_SERIAL(klass) && + ent->mid == id) { +#if VM_DEBUG_VERIFY_METHOD_CACHE + verify_method_cache(klass, id, ent->defined_class, ent->me); +#endif + if (defined_class_ptr) *defined_class_ptr = ent->defined_class; + RB_DEBUG_COUNTER_INC(mc_global_hit); + return ent->me; + } +#endif + + RB_DEBUG_COUNTER_INC(mc_global_miss); + return method_entry_get_without_cache(klass, id, defined_class_ptr); +} + +const rb_method_entry_t * +rb_method_entry(VALUE klass, ID id) +{ + return method_entry_get(klass, id, NULL); +} + +static const rb_callable_method_entry_t * +prepare_callable_method_entry(VALUE defined_class, ID id, const rb_method_entry_t *me) +{ + struct rb_id_table *mtbl; + const rb_callable_method_entry_t *cme; + + if (me && me->defined_class == 0) { + RB_DEBUG_COUNTER_INC(mc_cme_complement); + VM_ASSERT(RB_TYPE_P(defined_class, T_ICLASS) || RB_TYPE_P(defined_class, T_MODULE)); + VM_ASSERT(me->defined_class == 0); + + mtbl = RCLASS_CALLABLE_M_TBL(defined_class); + + if (mtbl && rb_id_table_lookup(mtbl, id, (VALUE *)&me)) { + RB_DEBUG_COUNTER_INC(mc_cme_complement_hit); + cme = (rb_callable_method_entry_t *)me; + VM_ASSERT(callable_method_entry_p(cme)); + } + else { + if (!mtbl) { + mtbl = RCLASS_EXT(defined_class)->callable_m_tbl = rb_id_table_create(0); + } + cme = rb_method_entry_complement_defined_class(me, me->called_id, defined_class); + rb_id_table_insert(mtbl, id, (VALUE)cme); + VM_ASSERT(callable_method_entry_p(cme)); + } + } + else { + cme = (const rb_callable_method_entry_t *)me; + VM_ASSERT(callable_method_entry_p(cme)); + } + + return cme; +} + +const rb_callable_method_entry_t * +rb_callable_method_entry(VALUE klass, ID id) +{ + VALUE defined_class; + rb_method_entry_t *me = method_entry_get(klass, id, &defined_class); + return prepare_callable_method_entry(defined_class, id, me); +} + +static const rb_method_entry_t *resolve_refined_method(VALUE refinements, const rb_method_entry_t *me, VALUE *defined_class_ptr); + +static const rb_method_entry_t * +method_entry_resolve_refinement(VALUE klass, ID id, int with_refinement, VALUE *defined_class_ptr) +{ + const rb_method_entry_t *me = method_entry_get(klass, id, defined_class_ptr); + + if (me) { + if (me->def->type == VM_METHOD_TYPE_REFINED) { + if (with_refinement) { + const rb_cref_t *cref = rb_vm_cref(); + VALUE refinements = cref ? CREF_REFINEMENTS(cref) : Qnil; + me = resolve_refined_method(refinements, me, defined_class_ptr); + } + else { + me = resolve_refined_method(Qnil, me, defined_class_ptr); + } + + if (UNDEFINED_METHOD_ENTRY_P(me)) me = NULL; + } + } + + return me; +} + +const rb_callable_method_entry_t * +rb_callable_method_entry_with_refinements(VALUE klass, ID id, VALUE *defined_class_ptr) +{ + VALUE defined_class, *dcp = defined_class_ptr ? defined_class_ptr : &defined_class; + const rb_method_entry_t *me = method_entry_resolve_refinement(klass, id, TRUE, dcp); + return prepare_callable_method_entry(*dcp, id, me); +} + +const rb_method_entry_t * +rb_method_entry_without_refinements(VALUE klass, ID id, VALUE *defined_class_ptr) +{ + return method_entry_resolve_refinement(klass, id, FALSE, defined_class_ptr); +} + +const rb_callable_method_entry_t * +rb_callable_method_entry_without_refinements(VALUE klass, ID id, VALUE *defined_class_ptr) +{ + VALUE defined_class, *dcp = defined_class_ptr ? defined_class_ptr : &defined_class; + const rb_method_entry_t *me = method_entry_resolve_refinement(klass, id, FALSE, dcp); + return prepare_callable_method_entry(*dcp, id, me); +} + +static const rb_method_entry_t * +refined_method_original_method_entry(VALUE refinements, const rb_method_entry_t *me, VALUE *defined_class_ptr) +{ + VALUE super; + + if (me->def->body.refined.orig_me) { + if (defined_class_ptr) *defined_class_ptr = me->def->body.refined.orig_me->defined_class; + return me->def->body.refined.orig_me; + } + else if (!(super = RCLASS_SUPER(me->owner))) { + return 0; + } + else { + rb_method_entry_t *tmp_me; + tmp_me = method_entry_get(super, me->called_id, defined_class_ptr); + return resolve_refined_method(refinements, tmp_me, defined_class_ptr); + } +} + +static const rb_method_entry_t * +resolve_refined_method(VALUE refinements, const rb_method_entry_t *me, VALUE *defined_class_ptr) +{ + if (me && me->def->type == VM_METHOD_TYPE_REFINED) { + VALUE refinement; + rb_method_entry_t *tmp_me; + + refinement = find_refinement(refinements, me->owner); + if (NIL_P(refinement)) { + return refined_method_original_method_entry(refinements, me, defined_class_ptr); + } + else { + tmp_me = method_entry_get(refinement, me->called_id, defined_class_ptr); + + if (tmp_me && tmp_me->def->type != VM_METHOD_TYPE_REFINED) { + return tmp_me; + } + else { + return refined_method_original_method_entry(refinements, me, defined_class_ptr); + } + } + } + else { + return me; + } +} + +const rb_method_entry_t * +rb_resolve_refined_method(VALUE refinements, const rb_method_entry_t *me) +{ + return resolve_refined_method(refinements, me, NULL); +} + +static const rb_callable_method_entry_t * +rb_resolve_refined_method_callable(VALUE refinements, const rb_callable_method_entry_t *me) +{ + VALUE defined_class = me->defined_class; + const rb_method_entry_t *resolved_me = resolve_refined_method(refinements, (const rb_method_entry_t *)me, &defined_class); + + if (resolved_me && resolved_me->defined_class == 0) { + return rb_method_entry_complement_defined_class(resolved_me, me->called_id, defined_class); + } + else { + return (const rb_callable_method_entry_t *)resolved_me; + } +} + +static void +remove_method(VALUE klass, ID mid) +{ + VALUE data; + rb_method_entry_t *me = 0; + VALUE self = klass; + + klass = RCLASS_ORIGIN(klass); + rb_frozen_class_p(klass); + if (mid == object_id || mid == id__send__ || mid == idInitialize) { + rb_warn("removing `%s' may cause serious problems", rb_id2name(mid)); + } + + if (!rb_id_table_lookup(RCLASS_M_TBL(klass), mid, &data) || + !(me = (rb_method_entry_t *)data) || + (!me->def || me->def->type == VM_METHOD_TYPE_UNDEF) || + UNDEFINED_REFINED_METHOD_P(me->def)) { + rb_name_err_raise("method `%1$s' not defined in %2$s", + klass, ID2SYM(mid)); + } + + rb_id_table_delete(RCLASS_M_TBL(klass), mid); + + rb_vm_check_redefinition_opt_method(me, klass); + rb_clear_method_cache_by_class(klass); + + if (me->def->type == VM_METHOD_TYPE_REFINED) { + rb_add_refined_method_entry(klass, mid); + } + + CALL_METHOD_HOOK(self, 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 + * remove_method(string) -> self + * + * Removes the method identified by _symbol_ from the current + * class. For an example, see <code>Module.undef_method</code>. + * String arguments are converted to symbols. + */ + +static VALUE +rb_mod_remove_method(int argc, VALUE *argv, VALUE mod) +{ + int i; + + for (i = 0; i < argc; i++) { + VALUE v = argv[i]; + ID id = rb_check_id(&v); + if (!id) { + rb_name_err_raise("method `%1$s' not defined in %2$s", + mod, v); + } + remove_method(mod, id); + } + return mod; +} + +static void +rb_export_method(VALUE klass, ID name, rb_method_visibility_t visi) +{ + rb_method_entry_t *me; + VALUE defined_class; + VALUE origin_class = RCLASS_ORIGIN(klass); + + me = search_method(origin_class, name, &defined_class); + if (!me && RB_TYPE_P(klass, T_MODULE)) { + me = search_method(rb_cObject, name, &defined_class); + } + + if (UNDEFINED_METHOD_ENTRY_P(me) || + UNDEFINED_REFINED_METHOD_P(me->def)) { + rb_print_undef(klass, name, METHOD_VISI_UNDEF); + } + + if (METHOD_ENTRY_VISI(me) != visi) { + rb_vm_check_redefinition_opt_method(me, klass); + + if (klass == defined_class || origin_class == defined_class) { + METHOD_ENTRY_VISI_SET(me, visi); + + if (me->def->type == VM_METHOD_TYPE_REFINED && me->def->body.refined.orig_me) { + METHOD_ENTRY_VISI_SET((rb_method_entry_t *)me->def->body.refined.orig_me, visi); + } + rb_clear_method_cache_by_class(klass); + } + else { + rb_add_method(klass, name, VM_METHOD_TYPE_ZSUPER, 0, visi); + } + } +} + +#define BOUND_PRIVATE 0x01 +#define BOUND_RESPONDS 0x02 + +int +rb_method_boundp(VALUE klass, ID id, int ex) +{ + const rb_method_entry_t *me = rb_method_entry_without_refinements(klass, id, NULL); + + if (me != 0) { + if ((ex & ~BOUND_RESPONDS) && + ((METHOD_ENTRY_VISI(me) == METHOD_VISI_PRIVATE) || + ((ex & BOUND_RESPONDS) && (METHOD_ENTRY_VISI(me) == METHOD_VISI_PROTECTED)))) { + return 0; + } + + if (me->def->type == VM_METHOD_TYPE_NOTIMPLEMENTED) { + if (ex & BOUND_RESPONDS) return 2; + return 0; + } + return 1; + } + return 0; +} + +static rb_method_visibility_t +rb_scope_visibility_get(void) +{ + const rb_execution_context_t *ec = GET_EC(); + const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp); + + if (!vm_env_cref_by_cref(cfp->ep)) { + return METHOD_VISI_PUBLIC; + } + else { + return CREF_SCOPE_VISI(rb_vm_cref())->method_visi; + } +} + +static int +rb_scope_module_func_check(void) +{ + const rb_execution_context_t *ec = GET_EC(); + const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp); + + if (!vm_env_cref_by_cref(cfp->ep)) { + return FALSE; + } + else { + return CREF_SCOPE_VISI(rb_vm_cref())->module_func; + } +} + +static void +vm_cref_set_visibility(rb_method_visibility_t method_visi, int module_func) +{ + rb_scope_visibility_t *scope_visi = (rb_scope_visibility_t *)&rb_vm_cref()->scope_visi; + scope_visi->method_visi = method_visi; + scope_visi->module_func = module_func; +} + +void +rb_scope_visibility_set(rb_method_visibility_t visi) +{ + vm_cref_set_visibility(visi, FALSE); +} + +static void +rb_scope_module_func_set(void) +{ + vm_cref_set_visibility(METHOD_VISI_PRIVATE, TRUE); +} + +void +rb_attr(VALUE klass, ID id, int read, int write, int ex) +{ + ID attriv; + rb_method_visibility_t visi; + + if (!ex) { + visi = METHOD_VISI_PUBLIC; + } + else { + switch (rb_scope_visibility_get()) { + case METHOD_VISI_PRIVATE: + if (rb_scope_module_func_check()) { + rb_warning("attribute accessor as module_function"); + } + visi = METHOD_VISI_PRIVATE; + break; + case METHOD_VISI_PROTECTED: + visi = METHOD_VISI_PROTECTED; + break; + default: + visi = METHOD_VISI_PUBLIC; + break; + } + } + + attriv = rb_intern_str(rb_sprintf("@%"PRIsVALUE, rb_id2str(id))); + if (read) { + rb_add_method(klass, id, VM_METHOD_TYPE_IVAR, (void *)attriv, visi); + } + if (write) { + rb_add_method(klass, rb_id_attrset(id), VM_METHOD_TYPE_ATTRSET, (void *)attriv, visi); + } +} + +void +rb_undef(VALUE klass, ID id) +{ + const rb_method_entry_t *me; + + if (NIL_P(klass)) { + rb_raise(rb_eTypeError, "no class to undef method"); + } + 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, 0); + if (me && me->def->type == VM_METHOD_TYPE_REFINED) { + me = rb_resolve_refined_method(Qnil, me); + } + + if (UNDEFINED_METHOD_ENTRY_P(me) || + UNDEFINED_REFINED_METHOD_P(me->def)) { + rb_method_name_error(klass, rb_id2str(id)); + } + + rb_add_method(klass, id, VM_METHOD_TYPE_UNDEF, 0, METHOD_VISI_PUBLIC); + + CALL_METHOD_HOOK(klass, undefined, id); +} + +/* + * call-seq: + * undef_method(symbol) -> self + * undef_method(string) -> 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. + * String arguments are converted to symbols. + * + * 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++) { + VALUE v = argv[i]; + ID id = rb_check_id(&v); + if (!id) { + rb_method_name_error(mod, v); + } + rb_undef(mod, id); + } + return mod; +} + +/* + * call-seq: + * mod.method_defined?(symbol) -> true or false + * mod.method_defined?(string) -> 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. + * String arguments are converted to symbols. + * + * module A + * def method1() end + * def protected_method1() end + * protected :protected_method1 + * end + * class B + * def method2() end + * def private_method2() end + * private :private_method2 + * 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? "protected_method1" #=> true + * C.method_defined? "method4" #=> false + * C.method_defined? "private_method2" #=> false + */ + +static VALUE +rb_mod_method_defined(VALUE mod, VALUE mid) +{ + ID id = rb_check_id(&mid); + if (!id || !rb_method_boundp(mod, id, 1)) { + return Qfalse; + } + return Qtrue; + +} + +static VALUE +check_definition(VALUE mod, VALUE mid, rb_method_visibility_t visi) +{ + const rb_method_entry_t *me; + ID id = rb_check_id(&mid); + if (!id) return Qfalse; + me = rb_method_entry_without_refinements(mod, id, NULL); + if (me) { + if (METHOD_ENTRY_VISI(me) == visi) return Qtrue; + } + return Qfalse; +} + +/* + * call-seq: + * mod.public_method_defined?(symbol) -> true or false + * mod.public_method_defined?(string) -> 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). + * String arguments are converted to symbols. + * + * 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, mid, METHOD_VISI_PUBLIC); +} + +/* + * call-seq: + * mod.private_method_defined?(symbol) -> true or false + * mod.private_method_defined?(string) -> 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). + * String arguments are converted to symbols. + * + * 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, mid, METHOD_VISI_PRIVATE); +} + +/* + * call-seq: + * mod.protected_method_defined?(symbol) -> true or false + * mod.protected_method_defined?(string) -> 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). + * String arguments are converted to symbols. + * + * 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, mid, METHOD_VISI_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 const rb_method_definition_t * +original_method_definition(const rb_method_definition_t *def) +{ + again: + if (def) { + switch (def->type) { + case VM_METHOD_TYPE_REFINED: + if (def->body.refined.orig_me) { + def = def->body.refined.orig_me->def; + goto again; + } + break; + case VM_METHOD_TYPE_ALIAS: + def = def->body.alias.original_me->def; + goto again; + default: + break; + } + } + return def; +} + +static int +rb_method_definition_eq(const rb_method_definition_t *d1, const rb_method_definition_t *d2) +{ + d1 = original_method_definition(d1); + d2 = original_method_definition(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.iseqptr == d2->body.iseq.iseqptr; + 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; + case VM_METHOD_TYPE_REFINED: + case VM_METHOD_TYPE_ALIAS: + break; + } + rb_bug("rb_method_definition_eq: unsupported type: %d\n", d1->type); +} + +static st_index_t +rb_hash_method_definition(st_index_t hash, const rb_method_definition_t *def) +{ + hash = rb_hash_uint(hash, def->type); + def = original_method_definition(def); + + if (!def) return hash; + + switch (def->type) { + case VM_METHOD_TYPE_ISEQ: + return rb_hash_uint(hash, (st_index_t)def->body.iseq.iseqptr); + case VM_METHOD_TYPE_CFUNC: + hash = rb_hash_uint(hash, (st_index_t)def->body.cfunc.func); + return rb_hash_uint(hash, def->body.cfunc.argc); + case VM_METHOD_TYPE_ATTRSET: + case VM_METHOD_TYPE_IVAR: + return rb_hash_uint(hash, def->body.attr.id); + case VM_METHOD_TYPE_BMETHOD: + return rb_hash_proc(hash, def->body.proc); + case VM_METHOD_TYPE_MISSING: + return rb_hash_uint(hash, def->original_id); + case VM_METHOD_TYPE_ZSUPER: + case VM_METHOD_TYPE_NOTIMPLEMENTED: + case VM_METHOD_TYPE_UNDEF: + return hash; + case VM_METHOD_TYPE_OPTIMIZED: + return rb_hash_uint(hash, def->body.optimize_type); + case VM_METHOD_TYPE_REFINED: + case VM_METHOD_TYPE_ALIAS: + break; /* unreachable */ + } + rb_bug("rb_hash_method_definition: unsupported method type (%d)\n", def->type); + } + +st_index_t +rb_hash_method_entry(st_index_t hash, const rb_method_entry_t *me) +{ + return rb_hash_method_definition(hash, me->def); +} + +void +rb_alias(VALUE klass, ID alias_name, ID original_name) +{ + const VALUE target_klass = klass; + VALUE defined_class; + const rb_method_entry_t *orig_me; + rb_method_visibility_t visi = METHOD_VISI_UNDEF; + + if (NIL_P(klass)) { + rb_raise(rb_eTypeError, "no class to make alias"); + } + + rb_frozen_class_p(klass); + + again: + orig_me = search_method(klass, original_name, &defined_class); + if (orig_me && orig_me->def->type == VM_METHOD_TYPE_REFINED) { + orig_me = rb_resolve_refined_method(Qnil, orig_me); + } + + if (UNDEFINED_METHOD_ENTRY_P(orig_me) || + UNDEFINED_REFINED_METHOD_P(orig_me->def)) { + if ((!RB_TYPE_P(klass, T_MODULE)) || + (orig_me = search_method(rb_cObject, original_name, &defined_class), + UNDEFINED_METHOD_ENTRY_P(orig_me))) { + rb_print_undef(klass, original_name, METHOD_VISI_UNDEF); + } + } + + if (orig_me->def->type == VM_METHOD_TYPE_ZSUPER) { + klass = RCLASS_SUPER(klass); + original_name = orig_me->def->original_id; + visi = METHOD_ENTRY_VISI(orig_me); + goto again; + } + + if (visi == METHOD_VISI_UNDEF) visi = METHOD_ENTRY_VISI(orig_me); + + if (orig_me->defined_class == 0) { + rb_method_entry_make(target_klass, alias_name, target_klass, visi, + VM_METHOD_TYPE_ALIAS, NULL, orig_me->called_id, + (void *)rb_method_entry_clone(orig_me)); + method_added(target_klass, alias_name); + } + else { + rb_method_entry_t *alias_me; + + alias_me = method_entry_set(target_klass, alias_name, orig_me, visi, orig_me->owner); + RB_OBJ_WRITE(alias_me, &alias_me->owner, target_klass); + RB_OBJ_WRITE(alias_me, &alias_me->defined_class, defined_class); + } +} + +/* + * 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) +{ + ID oldid = rb_check_id(&oldname); + if (!oldid) { + rb_print_undef_str(mod, oldname); + } + rb_alias(mod, rb_to_id(newname), oldid); + return mod; +} + +static void +set_method_visibility(VALUE self, int argc, const VALUE *argv, rb_method_visibility_t visi) +{ + int i; + + rb_check_frozen(self); + if (argc == 0) { + rb_warning("%"PRIsVALUE" with no argument is just ignored", + QUOTE_ID(rb_frame_callee())); + return; + } + + for (i = 0; i < argc; i++) { + VALUE v = argv[i]; + ID id = rb_check_id(&v); + if (!id) { + rb_print_undef_str(self, v); + } + rb_export_method(self, id, visi); + } +} + +static VALUE +set_visibility(int argc, const VALUE *argv, VALUE module, rb_method_visibility_t visi) +{ + if (argc == 0) { + rb_scope_visibility_set(visi); + } + else { + set_method_visibility(module, argc, argv, visi); + } + return module; +} + +/* + * call-seq: + * public -> self + * public(symbol, ...) -> self + * public(string, ...) -> self + * + * With no arguments, sets the default visibility for subsequently + * defined methods to public. With arguments, sets the named methods to + * have public visibility. + * String arguments are converted to symbols. + */ + +static VALUE +rb_mod_public(int argc, VALUE *argv, VALUE module) +{ + return set_visibility(argc, argv, module, METHOD_VISI_PUBLIC); +} + +/* + * call-seq: + * protected -> self + * protected(symbol, ...) -> self + * protected(string, ...) -> self + * + * With no arguments, sets the default visibility for subsequently + * defined methods to protected. With arguments, sets the named methods + * to have protected visibility. + * String arguments are converted to symbols. + * + * If a method has protected visibility, it is callable only where + * <code>self</code> of the context is the same as the method. + * (method definition or instance_eval). This behavior is different from + * Java's protected method. Usually <code>private</code> should be used. + * + * Note that a protected method is slow because it can't use inline cache. + * + * To show a private method on RDoc, use <code>:doc:</code> instead of this. + */ + +static VALUE +rb_mod_protected(int argc, VALUE *argv, VALUE module) +{ + return set_visibility(argc, argv, module, METHOD_VISI_PROTECTED); +} + +/* + * call-seq: + * private -> self + * private(symbol, ...) -> self + * private(string, ...) -> self + * + * With no arguments, sets the default visibility for subsequently + * defined methods to private. With arguments, sets the named methods + * to have private visibility. + * String arguments are converted to symbols. + * + * module Mod + * def a() end + * def b() end + * private + * def c() end + * private :a + * end + * Mod.private_instance_methods #=> [:a, :c] + * + * Note that to show a private method on RDoc, use <code>:doc:</code>. + */ + +static VALUE +rb_mod_private(int argc, VALUE *argv, VALUE module) +{ + return set_visibility(argc, argv, module, METHOD_VISI_PRIVATE); +} + +/* + * call-seq: + * mod.public_class_method(symbol, ...) -> mod + * mod.public_class_method(string, ...) -> mod + * + * Makes a list of existing class methods public. + * + * String arguments are converted to symbols. + */ + +static VALUE +rb_mod_public_method(int argc, VALUE *argv, VALUE obj) +{ + set_method_visibility(rb_singleton_class(obj), argc, argv, METHOD_VISI_PUBLIC); + return obj; +} + +/* + * call-seq: + * mod.private_class_method(symbol, ...) -> mod + * mod.private_class_method(string, ...) -> mod + * + * Makes existing class methods private. Often used to hide the default + * constructor <code>new</code>. + * + * String arguments are converted to symbols. + * + * 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(rb_singleton_class(obj), argc, argv, METHOD_VISI_PRIVATE); + return obj; +} + +/* + * call-seq: + * public + * public(symbol, ...) + * public(string, ...) + * + * With no arguments, sets the default visibility for subsequently + * defined methods to public. With arguments, sets the named methods to + * have public visibility. + * + * String arguments are converted to symbols. + */ + +static VALUE +top_public(int argc, VALUE *argv) +{ + return rb_mod_public(argc, argv, rb_cObject); +} + +/* + * call-seq: + * private + * private(symbol, ...) + * private(string, ...) + * + * With no arguments, sets the default visibility for subsequently + * defined methods to private. With arguments, sets the named methods to + * have private visibility. + * + * String arguments are converted to symbols. + */ +static VALUE +top_private(int argc, VALUE *argv) +{ + return rb_mod_private(argc, argv, rb_cObject); +} + +/* + * call-seq: + * module_function(symbol, ...) -> self + * module_function(string, ...) -> 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. + * String arguments are converted to symbols. + * + * module Mod + * def one + * "This is one" + * end + * module_function :one + * end + * class Cls + * include Mod + * def call_one + * one + * end + * end + * Mod.one #=> "This is one" + * c = Cls.new + * c.call_one #=> "This is one" + * module Mod + * def one + * "This is the new one" + * end + * end + * Mod.one #=> "This is one" + * c.call_one #=> "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 (!RB_TYPE_P(module, T_MODULE)) { + rb_raise(rb_eTypeError, "module_function must be called for modules"); + } + + if (argc == 0) { + rb_scope_module_func_set(); + return module; + } + + set_method_visibility(module, argc, argv, METHOD_VISI_PRIVATE); + + for (i = 0; i < argc; i++) { + VALUE m = module; + + id = rb_to_id(argv[i]); + for (;;) { + me = search_method(m, id, 0); + if (me == 0) { + me = search_method(rb_cObject, id, 0); + } + if (UNDEFINED_METHOD_ENTRY_P(me)) { + rb_print_undef(module, id, METHOD_VISI_UNDEF); + } + 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, METHOD_VISI_PUBLIC); + } + return module; +} + +int +rb_method_basic_definition_p(VALUE klass, ID id) +{ + const rb_method_entry_t *me; + if (!klass) return TRUE; /* hidden object cannot be overridden */ + me = rb_method_entry(klass, id); + return (me && METHOD_ENTRY_BASIC(me)) ? TRUE : FALSE; +} + +static VALUE +call_method_entry(rb_execution_context_t *ec, VALUE defined_class, VALUE obj, ID id, + const rb_method_entry_t *me, int argc, const VALUE *argv) +{ + const rb_callable_method_entry_t *cme = + prepare_callable_method_entry(defined_class, id, me); + VALUE passed_block_handler = vm_passed_block_handler(ec); + VALUE result = vm_call0(ec, obj, id, argc, argv, cme); + vm_passed_block_handler_set(ec, passed_block_handler); + return result; +} + +static VALUE +basic_obj_respond_to_missing(rb_execution_context_t *ec, VALUE klass, VALUE obj, + VALUE mid, VALUE priv) +{ + VALUE defined_class, args[2]; + const ID rtmid = idRespond_to_missing; + const rb_method_entry_t *const me = + method_entry_get(klass, rtmid, &defined_class); + + if (!me || METHOD_ENTRY_BASIC(me)) return Qundef; + args[0] = mid; + args[1] = priv; + return call_method_entry(ec, defined_class, obj, rtmid, me, 2, args); +} + +static inline int +basic_obj_respond_to(rb_execution_context_t *ec, VALUE obj, ID id, int pub) +{ + VALUE klass = CLASS_OF(obj); + VALUE ret; + + switch (rb_method_boundp(klass, id, pub|BOUND_RESPONDS)) { + case 2: + return FALSE; + case 0: + ret = basic_obj_respond_to_missing(ec, klass, obj, ID2SYM(id), + pub ? Qfalse : Qtrue); + return RTEST(ret) && ret != Qundef; + default: + return TRUE; + } +} + +static int +vm_respond_to(rb_execution_context_t *ec, VALUE klass, VALUE obj, ID id, int priv) +{ + VALUE defined_class; + const ID resid = idRespond_to; + const rb_method_entry_t *const me = + method_entry_get(klass, resid, &defined_class); + + if (!me) return -1; + if (METHOD_ENTRY_BASIC(me)) { + return -1; + } + else { + int argc = 1; + VALUE args[2]; + VALUE result; + + args[0] = ID2SYM(id); + args[1] = Qtrue; + if (priv) { + argc = rb_method_entry_arity(me); + if (argc > 2) { + rb_raise(rb_eArgError, + "respond_to? must accept 1 or 2 arguments (requires %d)", + argc); + } + if (argc != 1) { + argc = 2; + } + else if (!NIL_P(ruby_verbose)) { + VALUE location = rb_method_entry_location(me); + rb_warn("%"PRIsVALUE"%c""respond_to?(:%"PRIsVALUE") uses" + " the deprecated method signature, which takes one parameter", + (FL_TEST(klass, FL_SINGLETON) ? obj : klass), + (FL_TEST(klass, FL_SINGLETON) ? '.' : '#'), + QUOTE_ID(id)); + if (!NIL_P(location)) { + VALUE path = RARRAY_AREF(location, 0); + VALUE line = RARRAY_AREF(location, 1); + if (!NIL_P(path)) { + rb_compile_warn(RSTRING_PTR(path), NUM2INT(line), + "respond_to? is defined here"); + } + } + } + } + result = call_method_entry(ec, defined_class, obj, resid, me, argc, args); + return RTEST(result); + } +} + +int +rb_obj_respond_to(VALUE obj, ID id, int priv) +{ + rb_execution_context_t *ec = GET_EC(); + VALUE klass = CLASS_OF(obj); + int ret = vm_respond_to(ec, klass, obj, id, priv); + if (ret == -1) ret = basic_obj_respond_to(ec, obj, id, !priv); + return ret; +} + +int +rb_respond_to(VALUE obj, ID id) +{ + return rb_obj_respond_to(obj, id, FALSE); +} + + +/* + * call-seq: + * obj.respond_to?(symbol, include_all=false) -> true or false + * obj.respond_to?(string, include_all=false) -> true or false + * + * Returns +true+ if _obj_ responds to the given method. Private and + * protected 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. + * + * When the method name parameter is given as a string, the string is + * converted to a symbol. + */ + +static VALUE +obj_respond_to(int argc, VALUE *argv, VALUE obj) +{ + VALUE mid, priv; + ID id; + rb_execution_context_t *ec = GET_EC(); + + rb_scan_args(argc, argv, "11", &mid, &priv); + if (!(id = rb_check_id(&mid))) { + VALUE ret = basic_obj_respond_to_missing(ec, CLASS_OF(obj), obj, + rb_to_symbol(mid), priv); + if (ret == Qundef) ret = Qfalse; + return ret; + } + if (basic_obj_respond_to(ec, obj, id, !RTEST(priv))) + return Qtrue; + return Qfalse; +} + +/* + * call-seq: + * obj.respond_to_missing?(symbol, include_all) -> true or false + * obj.respond_to_missing?(string, include_all) -> true or false + * + * DO NOT USE THIS DIRECTLY. + * + * Hook method to return whether the _obj_ can respond to _id_ method + * or not. + * + * When the method name parameter is given as a string, the string is + * converted to a symbol. + * + * See #respond_to?, and the example of BasicObject. + */ +static VALUE +obj_respond_to_missing(VALUE obj, VALUE mid, VALUE priv) +{ + return Qfalse; +} + +void +Init_Method(void) +{ +#if OPT_GLOBAL_METHOD_CACHE + char *ptr = getenv("RUBY_GLOBAL_METHOD_CACHE_SIZE"); + int val; + + if (ptr != NULL && (val = atoi(ptr)) > 0) { + if ((val & (val - 1)) == 0) { /* ensure val is a power of 2 */ + global_method_cache.size = val; + global_method_cache.mask = val - 1; + } + else { + fprintf(stderr, "RUBY_GLOBAL_METHOD_CACHE_SIZE was set to %d but ignored because the value is not a power of 2.\n", val); + } + } + + global_method_cache.entries = (struct cache_entry *)calloc(global_method_cache.size, sizeof(struct cache_entry)); + if (global_method_cache.entries == NULL) { + fprintf(stderr, "[FATAL] failed to allocate memory\n"); + exit(EXIT_FAILURE); + } +#endif +} + +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_method(rb_cModule, "remove_method", rb_mod_remove_method, -1); + rb_define_method(rb_cModule, "undef_method", rb_mod_undef_method, -1); + rb_define_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_private_method(rb_singleton_class(rb_vm_top_self()), + "public", top_public, -1); + rb_define_private_method(rb_singleton_class(rb_vm_top_self()), + "private", top_private, -1); + + { +#define REPLICATE_METHOD(klass, id) do { \ + const rb_method_entry_t *me = rb_method_entry((klass), (id)); \ + rb_method_entry_set((klass), (id), me, METHOD_ENTRY_VISI(me)); \ + } while (0) + + REPLICATE_METHOD(rb_eException, idMethodMissing); + REPLICATE_METHOD(rb_eException, idRespond_to); + REPLICATE_METHOD(rb_eException, idRespond_to_missing); + } +} |