C++ MethodTableBucket::private_p方法代码示例

  Object* System::vm_check_callable(STATE, Object* obj, Symbol* sym, Object* self) {
    Module* mod = obj->lookup_begin(state);

    MethodTableBucket* entry;
    bool skip_vis_check = false;

    while(!mod->nil_p()) {
      entry = mod->method_table()->find_entry(state, sym);

      if(entry) {
        if(entry->undef_p(state)) return Qfalse;
        if(!skip_vis_check) {
          if(entry->private_p(state)) return Qfalse;
          if(entry->protected_p(state)) {
            if(!self->kind_of_p(state, mod)) return Qfalse;
          }
        }

        // It's callable, ok, but see if we should see if it's just a stub
        // to change the visibility of another method.
        if(entry->method()->nil_p()) {
          skip_vis_check = true;
        } else {
          return Qtrue;
        }
      }

      mod = mod->superclass();
    }

    return Qfalse;
  }

  MethodMissingReason InlineCache::fill_public(STATE, Object* self, Symbol* name) {
    MethodTableBucket* entry;

    Module* module = klass_;

    // Check the global cache first!
    GlobalCache::cache_entry* global_entry =
      state->global_cache()->lookup(module, name);

    if(global_entry &&
        global_entry->is_public &&
        !global_entry->method_missing) {
      this->method = global_entry->method;
      this->module = global_entry->module;

      return eNone;
    }

    bool skip_vis_check = false;

    MethodTableBucket* vis_entry = 0;

    Symbol* target_name = name;

    do {
      entry = module->method_table()->find_entry(state, target_name);

      /* Nothing, there? Ok, keep looking. */
      if(entry) {
        /* A 'false' method means to terminate method lookup.
         * (eg. undef_method) */
        if(entry->undef_p(state)) return eNormal;

        if(!skip_vis_check) {
          /* The method is private, but this wasn't a private send. */
          if(entry->private_p(state)) {
            return ePrivate;
          } else if(entry->protected_p(state)) {
            /* The method is protected, but it's not being called from
             * the same module */
            Module* check_mod;
            if(IncludedModule* im = try_as<IncludedModule>(module)) {
              check_mod = im->module();
            } else {
              check_mod = module;
            }

            if(!self->kind_of_p(state, check_mod)) {
              return eProtected;
            }
          }
        }

        /* The method was callable, but we need to keep looking
         * for the implementation, so make the invocation bypass all further
         * visibility checks.
         *
         * This is pretty much always where a subclass marks a superclass
         * method as public. We don't move the method, we just put this
         * marker into the method table. */
        if(entry->method()->nil_p()) {
          vis_entry = entry;
          skip_vis_check = true;
        } else {
          Module* use_module;
          Executable* use_exec;

          if(Alias* alias = try_as<Alias>(entry->method())) {
            // Same check as above, allow an alias to be for a superclass
            // method.
            if(alias->original_exec()->nil_p()) {
              vis_entry = entry;
              skip_vis_check = true;
              use_exec = 0;
              target_name = alias->original_name();
            } else {
              use_exec = alias->original_exec();
              use_module = alias->original_module();
            }
          } else {
            use_module = module;
            use_exec = entry->method();
          }

          if(use_exec) {
            this->module = use_module;
            this->method = use_exec;

            if(!vis_entry) vis_entry = entry;

            state->global_cache()->retain(state, klass_, name, this->module,
                  this->method, false,
                  !vis_entry->public_p(state));

            return eNone;
          }
        }
      }

      module = module->superclass();
//.........这里部分代码省略.........

  static bool hierarchy_resolve(STATE, Symbol* name, Dispatch& msg, LookupData& lookup) {
    Module* module = lookup.from;
    MethodTableBucket* entry;
    bool skip_vis_check = false;

    do {

      if(module != module->origin()) {
        module = module->superclass();
      }

      entry = module->method_table()->find_entry(state, name);

      /* Nothing, there? Ok, keep looking. */
      if(!entry) goto keep_looking;

      /* A 'false' method means to terminate method lookup.
       * (eg. undef_method) */
      if(entry->undef_p(state)) {
        msg.method_missing = eNormal;
        return false;
      }

      /* If this was a private send, then we can handle use
       * any method seen. */
      if(lookup.min_visibility == G(sym_private) || skip_vis_check) {
        /* The method was callable, but we need to keep looking
         * for the implementation, so make the invocation bypass all further
         * visibility checks. If we are skipping visibility checks we
         * shouldn't update visibility anymore because the implementation
         * might have a different visibility than the original lookup.
         */
        if(!skip_vis_check) {
          msg.visibility = entry->visibility();
        }
        if(entry->method()->nil_p() && entry->method_id()->nil_p()) {
        // TODO: fix using method() == cNil for this
        // if(entry->method()->nil_p()) {
          skip_vis_check = true;
          goto keep_looking;
        }

        if(Alias* alias = try_as<Alias>(entry->method())) {
          if(alias->original_exec()->nil_p()) {
            name           = alias->original_name();
            msg.visibility = entry->visibility();
            skip_vis_check = true;
          } else {
            msg.method = alias->original_exec();
            msg.module = alias->original_module();
          }
        } else {
          msg.method = entry->get_method(state);
          msg.module = module;
        }
        if(msg.method) return true;
      } else {
        /* The method is private, but this wasn't a private send. */
        if(entry->private_p(state)) {
          msg.method_missing = ePrivate;
          return false;
        } else if(entry->protected_p(state)) {
          /* The method is protected, but it's not being called from
           * the same module, or we only want public methods. */
          Module* check_mod;
          if(IncludedModule* im = try_as<IncludedModule>(module)) {
            check_mod = im->module();
          } else {
            check_mod = module;
          }

          if(lookup.min_visibility == G(sym_public) && !lookup.recv->kind_of_p(state, check_mod)) {
            msg.method_missing = eProtected;
            return false;
          }
        }

        /* The method was callable, but we need to keep looking
         * for the implementation, so make the invocation bypass all further
         * visibility checks. If we are skipping visibility checks we
         * shouldn't update visibility anymore because the implementation
         * might have a different visibility than the original lookup.
         */
        if(!skip_vis_check) {
          msg.visibility = entry->visibility();
        }
        if(entry->method()->nil_p() && entry->method_id()->nil_p()) {
        // TODO: fix using method() == cNil for this
        // if(entry->method()->nil_p()) {
          skip_vis_check = true;
          goto keep_looking;
        }

        if(Alias* alias = try_as<Alias>(entry->method())) {
          if(alias->original_exec()->nil_p()) {
            name           = alias->original_name();
            msg.visibility = entry->visibility();
            skip_vis_check = true;
          } else {
            msg.method = alias->original_exec();
//.........这里部分代码省略.........

  MethodMissingReason InlineCache::fill_public(STATE, Object* self, Symbol* name) {
    MethodTableBucket* entry;

    Module* module = klass_;

    // Check the global cache first!
    GlobalCache::cache_entry* global_entry =
      state->global_cache->lookup(module, name);

    if(global_entry &&
        global_entry->is_public &&
        !global_entry->method_missing) {
      this->method = global_entry->method;
      this->module = global_entry->module;

      return eNone;
    }

    bool skip_vis_check = false;

    do {
      entry = module->method_table()->find_entry(state, name);

      /* Nothing, there? Ok, keep looking. */
      if(entry) {
        /* A 'false' method means to terminate method lookup.
         * (eg. undef_method) */
        if(entry->undef_p(state)) return eNormal;

        if(!skip_vis_check) {
          /* The method is private, but this wasn't a private send. */
          if(entry->private_p(state)) {
            return ePrivate;
          } else if(entry->protected_p(state)) {
            /* The method is protected, but it's not being called from
             * the same module */
            if(!self->kind_of_p(state, module)) {
              return eProtected;
            }
          }
        }

        /* The method was callable, but we need to keep looking
         * for the implementation, so make the invocation bypass all further
         * visibility checks.
         *
         * This is pretty much always where a subclass marks a superclass
         * method as public. We don't move the method, we just put this
         * marker into the method table. */
        if(entry->method()->nil_p()) {
          skip_vis_check = true;
        } else {
          this->method = entry->method();
          this->module = module;

          state->global_cache->retain(state, klass_, name, this->module,
                                      this->method, false,
                                      !entry->public_p(state));
          return eNone;
        }
      }

      module = module->superclass();

      /* No more places to look, we couldn't find it. */
      if(module->nil_p()) return eNormal;
    } while(1);

    // Shouldn't be here!
    rubinius::abort();
  }

  static bool hierarchy_resolve(STATE, Symbol* name, Dispatch& msg, LookupData& lookup,
                                  bool* was_private)
  {
    Module* module = lookup.from;
    MethodTableBucket* entry;
    bool skip_vis_check = false;

    do {
      entry = module->method_table()->find_entry(state, name);

      /* Nothing, there? Ok, keep looking. */
      if(!entry) goto keep_looking;

      /* A 'false' method means to terminate method lookup.
       * (eg. undef_method) */
      if(entry->undef_p(state)) return false;

      /* If this was a private send, then we can handle use
       * any method seen. */
      if(lookup.priv || skip_vis_check) {
        /* nil means that the actual method object is 'up' from here */
        if(entry->method()->nil_p()) goto keep_looking;
        *was_private = entry->private_p(state);

        if(Alias* alias = try_as<Alias>(entry->method())) {
          msg.method = alias->original_exec();
          msg.module = alias->original_module();
        } else {
          msg.method = entry->method();
          msg.module = module;
        }
        break;
      } else {
        /* The method is private, but this wasn't a private send. */
        if(entry->private_p(state)) {
          return false;
        } else if(entry->protected_p(state)) {
          /* The method is protected, but it's not being called from
           * the same module */
          if(!lookup.recv->kind_of_p(state, module)) {
            return false;
          }
        }

        /* The method was callable, but we need to keep looking
         * for the implementation, so make the invocation bypass all further
         * visibility checks */
        if(entry->method()->nil_p()) {
          skip_vis_check = true;
          goto keep_looking;
        }

        if(Alias* alias = try_as<Alias>(entry->method())) {
          msg.method = alias->original_exec();
          msg.module = alias->original_module();
        } else {
          msg.method = entry->method();
          msg.module = module;
        }
        break;
      }

keep_looking:
      module = module->superclass();

      /* No more places to look, we couldn't find it. */
      if(module->nil_p()) return false;
    } while(1);

    return true;
  }