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This implement branch prediction macros likely() and unlikely() like in Linux. When using these macros please ensure that when you use them the condition in the branch really is very, very likely or unlikely. Think 90+% of the time. Primarily useful for error checking. (And I implement these macros for all our error checking macros now) See this article for more information: https://kernelnewbies.org/FAQ/LikelyUnlikely There are more places where these macros may make sense in renderer and physics engine. Placing them will come in another commit down the line.
313 lines
17 KiB
C++
313 lines
17 KiB
C++
/*************************************************************************/
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/* error_macros.h */
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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) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2017 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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#ifndef ERROR_MACROS_H
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#define ERROR_MACROS_H
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#include "typedefs.h"
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/**
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* Error macros. Unlike exceptions and asserts, these macros try to mantain consistency and stability
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* inside the code. It is recommended to always return processable data, so in case of an error, the
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* engine can stay working well.
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* In most cases, bugs and/or invalid data are not fatal and should never allow a perfectly running application
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* to fail or crash.
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*/
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/**
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* Pointer to the error macro priting function. Reassign to any function to have errors printed
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*/
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/** Function used by the error macros */
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// function, file, line, error, explanation
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enum ErrorHandlerType {
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ERR_HANDLER_ERROR,
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ERR_HANDLER_WARNING,
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ERR_HANDLER_SCRIPT,
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ERR_HANDLER_SHADER,
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};
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typedef void (*ErrorHandlerFunc)(void *, const char *, const char *, int p_line, const char *, const char *, ErrorHandlerType p_type);
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void _err_set_last_error(const char *p_err);
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void _err_clear_last_error();
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struct ErrorHandlerList {
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ErrorHandlerFunc errfunc;
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void *userdata;
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ErrorHandlerList *next;
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ErrorHandlerList() {
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errfunc = 0;
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next = 0;
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userdata = 0;
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}
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};
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void add_error_handler(ErrorHandlerList *p_handler);
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void remove_error_handler(ErrorHandlerList *p_handler);
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void _err_print_error(const char *p_function, const char *p_file, int p_line, const char *p_error, ErrorHandlerType p_type = ERR_HANDLER_ERROR);
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#ifndef _STR
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#define _STR(m_x) #m_x
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#define _MKSTR(m_x) _STR(m_x)
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#endif
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#define _FNL __FILE__ ":"
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/** An index has failed if m_index<0 or m_index >=m_size, the function exists */
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extern bool _err_error_exists;
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#ifdef DEBUG_ENABLED
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/** Print a warning string.
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*/
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#define ERR_EXPLAINC(m_reason) \
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{ \
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_err_set_last_error(m_reason); \
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_err_error_exists = true; \
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}
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#define ERR_EXPLAIN(m_string) \
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{ \
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_err_set_last_error(String(m_string).utf8().get_data()); \
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_err_error_exists = true; \
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}
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#else
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#define ERR_EXPLAIN(m_text)
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#define ERR_EXPLAINC(m_text)
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#endif
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#ifdef __GNUC__
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//#define FUNCTION_STR __PRETTY_FUNCTION__ - too annoying
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#define FUNCTION_STR __FUNCTION__
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#else
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#define FUNCTION_STR __FUNCTION__
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#endif
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// Don't use this directly; instead, use any of the CRASH_* macros
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#ifdef _MSC_VER
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#define GENERATE_TRAP \
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__debugbreak(); \
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/* Avoid warning about control paths */ \
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for (;;) { \
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}
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#else
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#define GENERATE_TRAP __builtin_trap();
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#endif
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// (*): See https://stackoverflow.com/questions/257418/do-while-0-what-is-it-good-for
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#define ERR_FAIL_INDEX(m_index, m_size) \
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do { \
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if (unlikely((m_index) < 0 || (m_index) >= (m_size))) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Index " _STR(m_index) " out of size (" _STR(m_size) ")."); \
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return; \
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} else \
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_err_error_exists = false; \
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} while (0); // (*)
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/** An index has failed if m_index<0 or m_index >=m_size, the function exists.
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* This function returns an error value, if returning Error, please select the most
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* appropriate error condition from error_macros.h
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*/
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#define ERR_FAIL_INDEX_V(m_index, m_size, m_retval) \
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do { \
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if (unlikely((m_index) < 0 || (m_index) >= (m_size))) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Index " _STR(m_index) " out of size (" _STR(m_size) ")."); \
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return m_retval; \
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} else \
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_err_error_exists = false; \
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} while (0); // (*)
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/** Use this one if there is no sensible fallback, that is, the error is unrecoverable.
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* We'll return a null reference and try to keep running.
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*/
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#define CRASH_BAD_INDEX(m_index, m_size) \
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do { \
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if (unlikely((m_index) < 0 || (m_index) >= (m_size))) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "FATAL: Index " _STR(m_index) " out of size (" _STR(m_size) ")."); \
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GENERATE_TRAP \
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} \
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} while (0); // (*)
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/** An error condition happened (m_cond tested true) (WARNING this is the opposite as assert().
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* the function will exit.
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*/
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#define ERR_FAIL_NULL(m_param) \
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{ \
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if (unlikely(!m_param)) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Parameter ' " _STR(m_param) " ' is null."); \
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return; \
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} else \
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_err_error_exists = false; \
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}
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#define ERR_FAIL_NULL_V(m_param, m_retval) \
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{ \
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if (unlikely(!m_param)) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Parameter ' " _STR(m_param) " ' is null."); \
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return m_retval; \
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} else \
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_err_error_exists = false; \
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}
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/** An error condition happened (m_cond tested true) (WARNING this is the opposite as assert().
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* the function will exit.
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*/
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#define ERR_FAIL_COND(m_cond) \
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{ \
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if (unlikely(m_cond)) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Condition ' " _STR(m_cond) " ' is true."); \
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return; \
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} else \
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_err_error_exists = false; \
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}
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/** Use this one if there is no sensible fallback, that is, the error is unrecoverable.
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*/
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#define CRASH_COND(m_cond) \
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{ \
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if (unlikely(m_cond)) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "FATAL: Condition ' " _STR(m_cond) " ' is true."); \
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GENERATE_TRAP \
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} \
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}
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/** An error condition happened (m_cond tested true) (WARNING this is the opposite as assert().
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* the function will exit.
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* This function returns an error value, if returning Error, please select the most
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* appropriate error condition from error_macros.h
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*/
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#define ERR_FAIL_COND_V(m_cond, m_retval) \
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{ \
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if (unlikely(m_cond)) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Condition ' " _STR(m_cond) " ' is true. returned: " _STR(m_retval)); \
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return m_retval; \
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} else \
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_err_error_exists = false; \
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}
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/** An error condition happened (m_cond tested true) (WARNING this is the opposite as assert().
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* the loop will skip to the next iteration.
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*/
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#define ERR_CONTINUE(m_cond) \
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{ \
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if (unlikely(m_cond)) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Condition ' " _STR(m_cond) " ' is true. Continuing..:"); \
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continue; \
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} else \
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_err_error_exists = false; \
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}
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/** An error condition happened (m_cond tested true) (WARNING this is the opposite as assert().
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* the loop will break
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*/
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#define ERR_BREAK(m_cond) \
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{ \
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if (unlikely(m_cond)) { \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Condition ' " _STR(m_cond) " ' is true. Breaking..:"); \
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break; \
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} else \
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_err_error_exists = false; \
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}
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/** Print an error string and return
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*/
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#define ERR_FAIL() \
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{ \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Method/Function Failed."); \
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_err_error_exists = false; \
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return; \
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}
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/** Print an error string and return with value
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*/
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#define ERR_FAIL_V(m_value) \
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{ \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "Method/Function Failed, returning: " __STR(m_value)); \
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_err_error_exists = false; \
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return m_value; \
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}
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/** Use this one if there is no sensible fallback, that is, the error is unrecoverable.
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*/
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#define CRASH_NOW() \
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{ \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, "FATAL: Method/Function Failed."); \
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GENERATE_TRAP \
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}
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/** Print an error string.
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*/
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#define ERR_PRINT(m_string) \
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{ \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, m_string); \
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_err_error_exists = false; \
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}
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#define ERR_PRINTS(m_string) \
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{ \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, String(m_string).utf8().get_data()); \
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_err_error_exists = false; \
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}
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/** Print a warning string.
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*/
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#define WARN_PRINT(m_string) \
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{ \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, m_string, ERR_HANDLER_WARNING); \
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_err_error_exists = false; \
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}
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#define WARN_PRINTS(m_string) \
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{ \
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_err_print_error(FUNCTION_STR, __FILE__, __LINE__, String(m_string).utf8().get_data(), ERR_HANDLER_WARNING); \
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_err_error_exists = false; \
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}
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#endif
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