02f2107620
The function `statistics()`, called when the MessageQueue is out of memory, will still use the MessageQueue so it crashes. Moving the error above will improve the behavior since the developer will find the crash reasons and the instruction on how to fix it.
344 lines
11 KiB
C++
344 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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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/config/project_settings.h"
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#include "core/core_string_names.h"
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#include "core/object/class_db.h"
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#include "core/object/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_callp(ObjectID p_id, const StringName &p_method, const Variant **p_args, int p_argcount, bool p_show_error) {
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return push_callablep(Callable(p_id, p_method), p_args, p_argcount, p_show_error);
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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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}
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ERR_PRINT("Failed set: " + type + ":" + p_prop + " target ID: " + itos(p_id) + ". Message queue out of memory. Try increasing 'memory/limits/message_queue/max_size_kb' in project settings.");
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statistics();
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return ERR_OUT_OF_MEMORY;
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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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ERR_PRINT("Failed notification: " + itos(p_notification) + " target ID: " + itos(p_id) + ". Message queue out of memory. Try increasing 'memory/limits/message_queue/max_size_kb' in project settings.");
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statistics();
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return ERR_OUT_OF_MEMORY;
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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_callp(Object *p_object, const StringName &p_method, const Variant **p_args, int p_argcount, bool p_show_error) {
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return push_callp(p_object->get_instance_id(), p_method, p_args, p_argcount, p_show_error);
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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_callablep(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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ERR_PRINT("Failed method: " + p_callable + ". Message queue out of memory. Try increasing 'memory/limits/message_queue/max_size_kb' in project settings.");
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statistics();
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return ERR_OUT_OF_MEMORY;
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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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}
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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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HashMap<StringName, int> set_count;
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HashMap<int, int> notify_count;
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HashMap<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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}
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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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}
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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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}
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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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}
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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 (const KeyValue<StringName, int> &E : set_count) {
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print_line("SET " + E.key + ": " + itos(E.value));
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}
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for (const KeyValue<Callable, int> &E : call_count) {
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print_line("CALL " + E.key + ": " + itos(E.value));
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}
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for (const KeyValue<int, int> &E : notify_count) {
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print_line("NOTIFY " + itos(E.key) + ": " + itos(E.value));
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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.callp(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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}
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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(PropertyInfo(Variant::INT, "memory/limits/message_queue/max_size_kb", PROPERTY_HINT_RANGE, "1024,4096,1,or_greater"), DEFAULT_QUEUE_SIZE_KB);
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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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}
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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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}
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singleton = nullptr;
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memdelete_arr(buffer);
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}
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