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292 lines
11 KiB
292 lines
11 KiB
4 years ago
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef SDL_assert_h_
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#define SDL_assert_h_
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#include "SDL_config.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef SDL_ASSERT_LEVEL
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#ifdef SDL_DEFAULT_ASSERT_LEVEL
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#define SDL_ASSERT_LEVEL SDL_DEFAULT_ASSERT_LEVEL
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#elif defined(_DEBUG) || defined(DEBUG) || \
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(defined(__GNUC__) && !defined(__OPTIMIZE__))
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#define SDL_ASSERT_LEVEL 2
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#else
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#define SDL_ASSERT_LEVEL 1
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#endif
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#endif /* SDL_ASSERT_LEVEL */
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/*
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These are macros and not first class functions so that the debugger breaks
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on the assertion line and not in some random guts of SDL, and so each
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assert can have unique static variables associated with it.
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*/
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#if defined(_MSC_VER)
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/* Don't include intrin.h here because it contains C++ code */
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extern void __cdecl __debugbreak(void);
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#define SDL_TriggerBreakpoint() __debugbreak()
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#elif ( (!defined(__NACL__)) && ((defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))) )
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#define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
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#elif defined(__386__) && defined(__WATCOMC__)
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#define SDL_TriggerBreakpoint() { _asm { int 0x03 } }
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#elif defined(HAVE_SIGNAL_H) && !defined(__WATCOMC__)
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#include <signal.h>
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#define SDL_TriggerBreakpoint() raise(SIGTRAP)
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#else
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/* How do we trigger breakpoints on this platform? */
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#define SDL_TriggerBreakpoint()
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#endif
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#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */
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# define SDL_FUNCTION __func__
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#elif ((__GNUC__ >= 2) || defined(_MSC_VER) || defined (__WATCOMC__))
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# define SDL_FUNCTION __FUNCTION__
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#else
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# define SDL_FUNCTION "???"
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#endif
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#define SDL_FILE __FILE__
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#define SDL_LINE __LINE__
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/*
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sizeof (x) makes the compiler still parse the expression even without
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assertions enabled, so the code is always checked at compile time, but
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doesn't actually generate code for it, so there are no side effects or
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expensive checks at run time, just the constant size of what x WOULD be,
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which presumably gets optimized out as unused.
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This also solves the problem of...
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int somevalue = blah();
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SDL_assert(somevalue == 1);
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...which would cause compiles to complain that somevalue is unused if we
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disable assertions.
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*/
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/* "while (0,0)" fools Microsoft's compiler's /W4 warning level into thinking
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this condition isn't constant. And looks like an owl's face! */
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#ifdef _MSC_VER /* stupid /W4 warnings. */
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#define SDL_NULL_WHILE_LOOP_CONDITION (0,0)
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#else
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#define SDL_NULL_WHILE_LOOP_CONDITION (0)
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#endif
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#define SDL_disabled_assert(condition) \
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do { (void) sizeof ((condition)); } while (SDL_NULL_WHILE_LOOP_CONDITION)
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typedef enum
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{
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SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */
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SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */
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SDL_ASSERTION_ABORT, /**< Terminate the program. */
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SDL_ASSERTION_IGNORE, /**< Ignore the assert. */
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SDL_ASSERTION_ALWAYS_IGNORE /**< Ignore the assert from now on. */
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} SDL_AssertState;
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typedef struct SDL_AssertData
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{
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int always_ignore;
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unsigned int trigger_count;
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const char *condition;
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const char *filename;
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int linenum;
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const char *function;
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const struct SDL_AssertData *next;
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} SDL_AssertData;
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#if (SDL_ASSERT_LEVEL > 0)
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/* Never call this directly. Use the SDL_assert* macros. */
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extern DECLSPEC SDL_AssertState SDLCALL SDL_ReportAssertion(SDL_AssertData *,
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const char *,
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const char *, int)
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#if defined(__clang__)
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#if __has_feature(attribute_analyzer_noreturn)
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/* this tells Clang's static analysis that we're a custom assert function,
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and that the analyzer should assume the condition was always true past this
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SDL_assert test. */
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__attribute__((analyzer_noreturn))
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#endif
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#endif
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;
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/* the do {} while(0) avoids dangling else problems:
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if (x) SDL_assert(y); else blah();
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... without the do/while, the "else" could attach to this macro's "if".
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We try to handle just the minimum we need here in a macro...the loop,
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the static vars, and break points. The heavy lifting is handled in
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SDL_ReportAssertion(), in SDL_assert.c.
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*/
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#define SDL_enabled_assert(condition) \
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do { \
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while ( !(condition) ) { \
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static struct SDL_AssertData sdl_assert_data = { \
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0, 0, #condition, 0, 0, 0, 0 \
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}; \
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const SDL_AssertState sdl_assert_state = SDL_ReportAssertion(&sdl_assert_data, SDL_FUNCTION, SDL_FILE, SDL_LINE); \
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if (sdl_assert_state == SDL_ASSERTION_RETRY) { \
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continue; /* go again. */ \
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} else if (sdl_assert_state == SDL_ASSERTION_BREAK) { \
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SDL_TriggerBreakpoint(); \
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} \
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break; /* not retrying. */ \
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} \
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} while (SDL_NULL_WHILE_LOOP_CONDITION)
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#endif /* enabled assertions support code */
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/* Enable various levels of assertions. */
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#if SDL_ASSERT_LEVEL == 0 /* assertions disabled */
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# define SDL_assert(condition) SDL_disabled_assert(condition)
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# define SDL_assert_release(condition) SDL_disabled_assert(condition)
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# define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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#elif SDL_ASSERT_LEVEL == 1 /* release settings. */
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# define SDL_assert(condition) SDL_disabled_assert(condition)
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# define SDL_assert_release(condition) SDL_enabled_assert(condition)
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# define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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#elif SDL_ASSERT_LEVEL == 2 /* normal settings. */
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# define SDL_assert(condition) SDL_enabled_assert(condition)
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# define SDL_assert_release(condition) SDL_enabled_assert(condition)
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# define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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#elif SDL_ASSERT_LEVEL == 3 /* paranoid settings. */
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# define SDL_assert(condition) SDL_enabled_assert(condition)
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# define SDL_assert_release(condition) SDL_enabled_assert(condition)
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# define SDL_assert_paranoid(condition) SDL_enabled_assert(condition)
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#else
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# error Unknown assertion level.
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#endif
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/* this assertion is never disabled at any level. */
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#define SDL_assert_always(condition) SDL_enabled_assert(condition)
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typedef SDL_AssertState (SDLCALL *SDL_AssertionHandler)(
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const SDL_AssertData* data, void* userdata);
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/**
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* \brief Set an application-defined assertion handler.
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*
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* This allows an app to show its own assertion UI and/or force the
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* response to an assertion failure. If the app doesn't provide this, SDL
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* will try to do the right thing, popping up a system-specific GUI dialog,
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* and probably minimizing any fullscreen windows.
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*
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* This callback may fire from any thread, but it runs wrapped in a mutex, so
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* it will only fire from one thread at a time.
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*
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* Setting the callback to NULL restores SDL's original internal handler.
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*
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* This callback is NOT reset to SDL's internal handler upon SDL_Quit()!
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*
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* Return SDL_AssertState value of how to handle the assertion failure.
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*
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* \param handler Callback function, called when an assertion fails.
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* \param userdata A pointer passed to the callback as-is.
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*/
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extern DECLSPEC void SDLCALL SDL_SetAssertionHandler(
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SDL_AssertionHandler handler,
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void *userdata);
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/**
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* \brief Get the default assertion handler.
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*
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* This returns the function pointer that is called by default when an
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* assertion is triggered. This is an internal function provided by SDL,
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* that is used for assertions when SDL_SetAssertionHandler() hasn't been
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* used to provide a different function.
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*
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* \return The default SDL_AssertionHandler that is called when an assert triggers.
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*/
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extern DECLSPEC SDL_AssertionHandler SDLCALL SDL_GetDefaultAssertionHandler(void);
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/**
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* \brief Get the current assertion handler.
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*
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* This returns the function pointer that is called when an assertion is
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* triggered. This is either the value last passed to
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* SDL_SetAssertionHandler(), or if no application-specified function is
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* set, is equivalent to calling SDL_GetDefaultAssertionHandler().
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*
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* \param puserdata Pointer to a void*, which will store the "userdata"
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* pointer that was passed to SDL_SetAssertionHandler().
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* This value will always be NULL for the default handler.
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* If you don't care about this data, it is safe to pass
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* a NULL pointer to this function to ignore it.
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* \return The SDL_AssertionHandler that is called when an assert triggers.
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*/
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extern DECLSPEC SDL_AssertionHandler SDLCALL SDL_GetAssertionHandler(void **puserdata);
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/**
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* \brief Get a list of all assertion failures.
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*
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* Get all assertions triggered since last call to SDL_ResetAssertionReport(),
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* or the start of the program.
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*
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* The proper way to examine this data looks something like this:
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*
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* <code>
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* const SDL_AssertData *item = SDL_GetAssertionReport();
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* while (item) {
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* printf("'%s', %s (%s:%d), triggered %u times, always ignore: %s.\\n",
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* item->condition, item->function, item->filename,
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* item->linenum, item->trigger_count,
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* item->always_ignore ? "yes" : "no");
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* item = item->next;
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* }
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* </code>
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*
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* \return List of all assertions.
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* \sa SDL_ResetAssertionReport
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*/
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extern DECLSPEC const SDL_AssertData * SDLCALL SDL_GetAssertionReport(void);
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/**
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* \brief Reset the list of all assertion failures.
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*
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* Reset list of all assertions triggered.
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*
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* \sa SDL_GetAssertionReport
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*/
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extern DECLSPEC void SDLCALL SDL_ResetAssertionReport(void);
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/* these had wrong naming conventions until 2.0.4. Please update your app! */
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#define SDL_assert_state SDL_AssertState
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#define SDL_assert_data SDL_AssertData
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* SDL_assert_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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