349 lines
11 KiB
C++
349 lines
11 KiB
C++
/*************************************************************************/
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/* message_queue.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "message_queue.h"
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#include "core/core_string_names.h"
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#include "core/project_settings.h"
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#include "core/script_language.h"
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MessageQueue *MessageQueue::singleton = nullptr;
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MessageQueue *MessageQueue::get_singleton() {
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return singleton;
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}
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Error MessageQueue::push_call(ObjectID p_id, const StringName &p_method, const Variant **p_args, int p_argcount, bool p_show_error) {
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return push_callable(Callable(p_id, p_method), p_args, p_argcount, p_show_error);
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}
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Error MessageQueue::push_call(ObjectID p_id, const StringName &p_method, VARIANT_ARG_DECLARE) {
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VARIANT_ARGPTRS;
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int argc = 0;
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for (int i = 0; i < VARIANT_ARG_MAX; i++) {
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if (argptr[i]->get_type() == Variant::NIL)
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break;
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argc++;
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}
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return push_call(p_id, p_method, argptr, argc, false);
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}
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Error MessageQueue::push_set(ObjectID p_id, const StringName &p_prop, const Variant &p_value) {
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_THREAD_SAFE_METHOD_
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uint8_t room_needed = sizeof(Message) + sizeof(Variant);
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if ((buffer_end + room_needed) >= buffer_size) {
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String type;
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if (ObjectDB::get_instance(p_id))
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type = ObjectDB::get_instance(p_id)->get_class();
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print_line("Failed set: " + type + ":" + p_prop + " target ID: " + itos(p_id));
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statistics();
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ERR_FAIL_V_MSG(ERR_OUT_OF_MEMORY, "Message queue out of memory. Try increasing 'memory/limits/message_queue/max_size_kb' in project settings.");
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}
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Message *msg = memnew_placement(&buffer[buffer_end], Message);
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msg->args = 1;
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msg->callable = Callable(p_id, p_prop);
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msg->type = TYPE_SET;
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buffer_end += sizeof(Message);
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Variant *v = memnew_placement(&buffer[buffer_end], Variant);
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buffer_end += sizeof(Variant);
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*v = p_value;
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return OK;
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}
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Error MessageQueue::push_notification(ObjectID p_id, int p_notification) {
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_THREAD_SAFE_METHOD_
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ERR_FAIL_COND_V(p_notification < 0, ERR_INVALID_PARAMETER);
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uint8_t room_needed = sizeof(Message);
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if ((buffer_end + room_needed) >= buffer_size) {
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print_line("Failed notification: " + itos(p_notification) + " target ID: " + itos(p_id));
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statistics();
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ERR_FAIL_V_MSG(ERR_OUT_OF_MEMORY, "Message queue out of memory. Try increasing 'memory/limits/message_queue/max_size_kb' in project settings.");
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}
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Message *msg = memnew_placement(&buffer[buffer_end], Message);
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msg->type = TYPE_NOTIFICATION;
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msg->callable = Callable(p_id, CoreStringNames::get_singleton()->notification); //name is meaningless but callable needs it
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//msg->target;
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msg->notification = p_notification;
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buffer_end += sizeof(Message);
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return OK;
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}
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Error MessageQueue::push_call(Object *p_object, const StringName &p_method, VARIANT_ARG_DECLARE) {
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return push_call(p_object->get_instance_id(), p_method, VARIANT_ARG_PASS);
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}
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Error MessageQueue::push_notification(Object *p_object, int p_notification) {
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return push_notification(p_object->get_instance_id(), p_notification);
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}
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Error MessageQueue::push_set(Object *p_object, const StringName &p_prop, const Variant &p_value) {
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return push_set(p_object->get_instance_id(), p_prop, p_value);
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}
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Error MessageQueue::push_callable(const Callable &p_callable, const Variant **p_args, int p_argcount, bool p_show_error) {
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_THREAD_SAFE_METHOD_
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int room_needed = sizeof(Message) + sizeof(Variant) * p_argcount;
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if ((buffer_end + room_needed) >= buffer_size) {
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print_line("Failed method: " + p_callable);
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statistics();
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ERR_FAIL_V_MSG(ERR_OUT_OF_MEMORY, "Message queue out of memory. Try increasing 'memory/limits/message_queue/max_size_kb' in project settings.");
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}
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Message *msg = memnew_placement(&buffer[buffer_end], Message);
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msg->args = p_argcount;
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msg->callable = p_callable;
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msg->type = TYPE_CALL;
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if (p_show_error)
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msg->type |= FLAG_SHOW_ERROR;
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buffer_end += sizeof(Message);
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for (int i = 0; i < p_argcount; i++) {
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Variant *v = memnew_placement(&buffer[buffer_end], Variant);
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buffer_end += sizeof(Variant);
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*v = *p_args[i];
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}
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return OK;
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}
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void MessageQueue::statistics() {
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Map<StringName, int> set_count;
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Map<int, int> notify_count;
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Map<Callable, int> call_count;
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int null_count = 0;
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uint32_t read_pos = 0;
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while (read_pos < buffer_end) {
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Message *message = (Message *)&buffer[read_pos];
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Object *target = message->callable.get_object();
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if (target != nullptr) {
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switch (message->type & FLAG_MASK) {
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case TYPE_CALL: {
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if (!call_count.has(message->callable))
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call_count[message->callable] = 0;
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call_count[message->callable]++;
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} break;
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case TYPE_NOTIFICATION: {
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if (!notify_count.has(message->notification))
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notify_count[message->notification] = 0;
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notify_count[message->notification]++;
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} break;
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case TYPE_SET: {
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StringName t = message->callable.get_method();
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if (!set_count.has(t))
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set_count[t] = 0;
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set_count[t]++;
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} break;
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}
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} else {
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//object was deleted
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print_line("Object was deleted while awaiting a callback");
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null_count++;
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}
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read_pos += sizeof(Message);
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION)
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read_pos += sizeof(Variant) * message->args;
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}
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print_line("TOTAL BYTES: " + itos(buffer_end));
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print_line("NULL count: " + itos(null_count));
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for (Map<StringName, int>::Element *E = set_count.front(); E; E = E->next()) {
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print_line("SET " + E->key() + ": " + itos(E->get()));
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}
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for (Map<Callable, int>::Element *E = call_count.front(); E; E = E->next()) {
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print_line("CALL " + E->key() + ": " + itos(E->get()));
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}
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for (Map<int, int>::Element *E = notify_count.front(); E; E = E->next()) {
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print_line("NOTIFY " + itos(E->key()) + ": " + itos(E->get()));
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}
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}
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int MessageQueue::get_max_buffer_usage() const {
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return buffer_max_used;
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}
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void MessageQueue::_call_function(const Callable &p_callable, const Variant *p_args, int p_argcount, bool p_show_error) {
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const Variant **argptrs = nullptr;
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if (p_argcount) {
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argptrs = (const Variant **)alloca(sizeof(Variant *) * p_argcount);
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for (int i = 0; i < p_argcount; i++) {
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argptrs[i] = &p_args[i];
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}
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}
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Callable::CallError ce;
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Variant ret;
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p_callable.call(argptrs, p_argcount, ret, ce);
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if (p_show_error && ce.error != Callable::CallError::CALL_OK) {
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ERR_PRINT("Error calling deferred method: " + Variant::get_callable_error_text(p_callable, argptrs, p_argcount, ce) + ".");
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}
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}
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void MessageQueue::flush() {
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if (buffer_end > buffer_max_used) {
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buffer_max_used = buffer_end;
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}
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uint32_t read_pos = 0;
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//using reverse locking strategy
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_THREAD_SAFE_LOCK_
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if (flushing) {
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_THREAD_SAFE_UNLOCK_
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ERR_FAIL_COND(flushing); //already flushing, you did something odd
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}
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flushing = true;
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while (read_pos < buffer_end) {
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//lock on each iteration, so a call can re-add itself to the message queue
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Message *message = (Message *)&buffer[read_pos];
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uint32_t advance = sizeof(Message);
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION)
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advance += sizeof(Variant) * message->args;
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//pre-advance so this function is reentrant
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read_pos += advance;
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_THREAD_SAFE_UNLOCK_
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Object *target = message->callable.get_object();
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if (target != nullptr) {
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switch (message->type & FLAG_MASK) {
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case TYPE_CALL: {
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Variant *args = (Variant *)(message + 1);
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// messages don't expect a return value
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_call_function(message->callable, args, message->args, message->type & FLAG_SHOW_ERROR);
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} break;
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case TYPE_NOTIFICATION: {
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// messages don't expect a return value
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target->notification(message->notification);
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} break;
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case TYPE_SET: {
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Variant *arg = (Variant *)(message + 1);
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// messages don't expect a return value
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target->set(message->callable.get_method(), *arg);
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} break;
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}
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}
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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Variant *args = (Variant *)(message + 1);
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for (int i = 0; i < message->args; i++) {
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args[i].~Variant();
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}
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}
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message->~Message();
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_THREAD_SAFE_LOCK_
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}
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buffer_end = 0; // reset buffer
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flushing = false;
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_THREAD_SAFE_UNLOCK_
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}
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bool MessageQueue::is_flushing() const {
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return flushing;
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}
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MessageQueue::MessageQueue() {
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ERR_FAIL_COND_MSG(singleton != nullptr, "A MessageQueue singleton already exists.");
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singleton = this;
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buffer_size = GLOBAL_DEF_RST("memory/limits/message_queue/max_size_kb", DEFAULT_QUEUE_SIZE_KB);
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ProjectSettings::get_singleton()->set_custom_property_info("memory/limits/message_queue/max_size_kb", PropertyInfo(Variant::INT, "memory/limits/message_queue/max_size_kb", PROPERTY_HINT_RANGE, "1024,4096,1,or_greater"));
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buffer_size *= 1024;
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buffer = memnew_arr(uint8_t, buffer_size);
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}
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MessageQueue::~MessageQueue() {
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uint32_t read_pos = 0;
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while (read_pos < buffer_end) {
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Message *message = (Message *)&buffer[read_pos];
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Variant *args = (Variant *)(message + 1);
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int argc = message->args;
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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for (int i = 0; i < argc; i++)
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args[i].~Variant();
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}
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message->~Message();
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read_pos += sizeof(Message);
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION)
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read_pos += sizeof(Variant) * message->args;
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}
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singleton = nullptr;
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memdelete_arr(buffer);
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}
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