292 lines
11 KiB
C
292 lines
11 KiB
C
/*
|
|
Simple DirectMedia Layer
|
|
Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
#ifndef SDL_assert_h_
|
|
#define SDL_assert_h_
|
|
|
|
#include "SDL_config.h"
|
|
|
|
#include "begin_code.h"
|
|
/* Set up for C function definitions, even when using C++ */
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifndef SDL_ASSERT_LEVEL
|
|
#ifdef SDL_DEFAULT_ASSERT_LEVEL
|
|
#define SDL_ASSERT_LEVEL SDL_DEFAULT_ASSERT_LEVEL
|
|
#elif defined(_DEBUG) || defined(DEBUG) || \
|
|
(defined(__GNUC__) && !defined(__OPTIMIZE__))
|
|
#define SDL_ASSERT_LEVEL 2
|
|
#else
|
|
#define SDL_ASSERT_LEVEL 1
|
|
#endif
|
|
#endif /* SDL_ASSERT_LEVEL */
|
|
|
|
/*
|
|
These are macros and not first class functions so that the debugger breaks
|
|
on the assertion line and not in some random guts of SDL, and so each
|
|
assert can have unique static variables associated with it.
|
|
*/
|
|
|
|
#if defined(_MSC_VER)
|
|
/* Don't include intrin.h here because it contains C++ code */
|
|
extern void __cdecl __debugbreak(void);
|
|
#define SDL_TriggerBreakpoint() __debugbreak()
|
|
#elif ( (!defined(__NACL__)) && ((defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))) )
|
|
#define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
|
|
#elif defined(__386__) && defined(__WATCOMC__)
|
|
#define SDL_TriggerBreakpoint() { _asm { int 0x03 } }
|
|
#elif defined(HAVE_SIGNAL_H) && !defined(__WATCOMC__)
|
|
#include <signal.h>
|
|
#define SDL_TriggerBreakpoint() raise(SIGTRAP)
|
|
#else
|
|
/* How do we trigger breakpoints on this platform? */
|
|
#define SDL_TriggerBreakpoint()
|
|
#endif
|
|
|
|
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */
|
|
# define SDL_FUNCTION __func__
|
|
#elif ((__GNUC__ >= 2) || defined(_MSC_VER) || defined (__WATCOMC__))
|
|
# define SDL_FUNCTION __FUNCTION__
|
|
#else
|
|
# define SDL_FUNCTION "???"
|
|
#endif
|
|
#define SDL_FILE __FILE__
|
|
#define SDL_LINE __LINE__
|
|
|
|
/*
|
|
sizeof (x) makes the compiler still parse the expression even without
|
|
assertions enabled, so the code is always checked at compile time, but
|
|
doesn't actually generate code for it, so there are no side effects or
|
|
expensive checks at run time, just the constant size of what x WOULD be,
|
|
which presumably gets optimized out as unused.
|
|
This also solves the problem of...
|
|
|
|
int somevalue = blah();
|
|
SDL_assert(somevalue == 1);
|
|
|
|
...which would cause compiles to complain that somevalue is unused if we
|
|
disable assertions.
|
|
*/
|
|
|
|
/* "while (0,0)" fools Microsoft's compiler's /W4 warning level into thinking
|
|
this condition isn't constant. And looks like an owl's face! */
|
|
#ifdef _MSC_VER /* stupid /W4 warnings. */
|
|
#define SDL_NULL_WHILE_LOOP_CONDITION (0,0)
|
|
#else
|
|
#define SDL_NULL_WHILE_LOOP_CONDITION (0)
|
|
#endif
|
|
|
|
#define SDL_disabled_assert(condition) \
|
|
do { (void) sizeof ((condition)); } while (SDL_NULL_WHILE_LOOP_CONDITION)
|
|
|
|
typedef enum
|
|
{
|
|
SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */
|
|
SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */
|
|
SDL_ASSERTION_ABORT, /**< Terminate the program. */
|
|
SDL_ASSERTION_IGNORE, /**< Ignore the assert. */
|
|
SDL_ASSERTION_ALWAYS_IGNORE /**< Ignore the assert from now on. */
|
|
} SDL_AssertState;
|
|
|
|
typedef struct SDL_AssertData
|
|
{
|
|
int always_ignore;
|
|
unsigned int trigger_count;
|
|
const char *condition;
|
|
const char *filename;
|
|
int linenum;
|
|
const char *function;
|
|
const struct SDL_AssertData *next;
|
|
} SDL_AssertData;
|
|
|
|
#if (SDL_ASSERT_LEVEL > 0)
|
|
|
|
/* Never call this directly. Use the SDL_assert* macros. */
|
|
extern DECLSPEC SDL_AssertState SDLCALL SDL_ReportAssertion(SDL_AssertData *,
|
|
const char *,
|
|
const char *, int)
|
|
#if defined(__clang__)
|
|
#if __has_feature(attribute_analyzer_noreturn)
|
|
/* this tells Clang's static analysis that we're a custom assert function,
|
|
and that the analyzer should assume the condition was always true past this
|
|
SDL_assert test. */
|
|
__attribute__((analyzer_noreturn))
|
|
#endif
|
|
#endif
|
|
;
|
|
|
|
/* the do {} while(0) avoids dangling else problems:
|
|
if (x) SDL_assert(y); else blah();
|
|
... without the do/while, the "else" could attach to this macro's "if".
|
|
We try to handle just the minimum we need here in a macro...the loop,
|
|
the static vars, and break points. The heavy lifting is handled in
|
|
SDL_ReportAssertion(), in SDL_assert.c.
|
|
*/
|
|
#define SDL_enabled_assert(condition) \
|
|
do { \
|
|
while ( !(condition) ) { \
|
|
static struct SDL_AssertData sdl_assert_data = { \
|
|
0, 0, #condition, 0, 0, 0, 0 \
|
|
}; \
|
|
const SDL_AssertState sdl_assert_state = SDL_ReportAssertion(&sdl_assert_data, SDL_FUNCTION, SDL_FILE, SDL_LINE); \
|
|
if (sdl_assert_state == SDL_ASSERTION_RETRY) { \
|
|
continue; /* go again. */ \
|
|
} else if (sdl_assert_state == SDL_ASSERTION_BREAK) { \
|
|
SDL_TriggerBreakpoint(); \
|
|
} \
|
|
break; /* not retrying. */ \
|
|
} \
|
|
} while (SDL_NULL_WHILE_LOOP_CONDITION)
|
|
|
|
#endif /* enabled assertions support code */
|
|
|
|
/* Enable various levels of assertions. */
|
|
#if SDL_ASSERT_LEVEL == 0 /* assertions disabled */
|
|
# define SDL_assert(condition) SDL_disabled_assert(condition)
|
|
# define SDL_assert_release(condition) SDL_disabled_assert(condition)
|
|
# define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
|
|
#elif SDL_ASSERT_LEVEL == 1 /* release settings. */
|
|
# define SDL_assert(condition) SDL_disabled_assert(condition)
|
|
# define SDL_assert_release(condition) SDL_enabled_assert(condition)
|
|
# define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
|
|
#elif SDL_ASSERT_LEVEL == 2 /* normal settings. */
|
|
# define SDL_assert(condition) SDL_enabled_assert(condition)
|
|
# define SDL_assert_release(condition) SDL_enabled_assert(condition)
|
|
# define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
|
|
#elif SDL_ASSERT_LEVEL == 3 /* paranoid settings. */
|
|
# define SDL_assert(condition) SDL_enabled_assert(condition)
|
|
# define SDL_assert_release(condition) SDL_enabled_assert(condition)
|
|
# define SDL_assert_paranoid(condition) SDL_enabled_assert(condition)
|
|
#else
|
|
# error Unknown assertion level.
|
|
#endif
|
|
|
|
/* this assertion is never disabled at any level. */
|
|
#define SDL_assert_always(condition) SDL_enabled_assert(condition)
|
|
|
|
|
|
typedef SDL_AssertState (SDLCALL *SDL_AssertionHandler)(
|
|
const SDL_AssertData* data, void* userdata);
|
|
|
|
/**
|
|
* \brief Set an application-defined assertion handler.
|
|
*
|
|
* This allows an app to show its own assertion UI and/or force the
|
|
* response to an assertion failure. If the app doesn't provide this, SDL
|
|
* will try to do the right thing, popping up a system-specific GUI dialog,
|
|
* and probably minimizing any fullscreen windows.
|
|
*
|
|
* This callback may fire from any thread, but it runs wrapped in a mutex, so
|
|
* it will only fire from one thread at a time.
|
|
*
|
|
* Setting the callback to NULL restores SDL's original internal handler.
|
|
*
|
|
* This callback is NOT reset to SDL's internal handler upon SDL_Quit()!
|
|
*
|
|
* Return SDL_AssertState value of how to handle the assertion failure.
|
|
*
|
|
* \param handler Callback function, called when an assertion fails.
|
|
* \param userdata A pointer passed to the callback as-is.
|
|
*/
|
|
extern DECLSPEC void SDLCALL SDL_SetAssertionHandler(
|
|
SDL_AssertionHandler handler,
|
|
void *userdata);
|
|
|
|
/**
|
|
* \brief Get the default assertion handler.
|
|
*
|
|
* This returns the function pointer that is called by default when an
|
|
* assertion is triggered. This is an internal function provided by SDL,
|
|
* that is used for assertions when SDL_SetAssertionHandler() hasn't been
|
|
* used to provide a different function.
|
|
*
|
|
* \return The default SDL_AssertionHandler that is called when an assert triggers.
|
|
*/
|
|
extern DECLSPEC SDL_AssertionHandler SDLCALL SDL_GetDefaultAssertionHandler(void);
|
|
|
|
/**
|
|
* \brief Get the current assertion handler.
|
|
*
|
|
* This returns the function pointer that is called when an assertion is
|
|
* triggered. This is either the value last passed to
|
|
* SDL_SetAssertionHandler(), or if no application-specified function is
|
|
* set, is equivalent to calling SDL_GetDefaultAssertionHandler().
|
|
*
|
|
* \param puserdata Pointer to a void*, which will store the "userdata"
|
|
* pointer that was passed to SDL_SetAssertionHandler().
|
|
* This value will always be NULL for the default handler.
|
|
* If you don't care about this data, it is safe to pass
|
|
* a NULL pointer to this function to ignore it.
|
|
* \return The SDL_AssertionHandler that is called when an assert triggers.
|
|
*/
|
|
extern DECLSPEC SDL_AssertionHandler SDLCALL SDL_GetAssertionHandler(void **puserdata);
|
|
|
|
/**
|
|
* \brief Get a list of all assertion failures.
|
|
*
|
|
* Get all assertions triggered since last call to SDL_ResetAssertionReport(),
|
|
* or the start of the program.
|
|
*
|
|
* The proper way to examine this data looks something like this:
|
|
*
|
|
* <code>
|
|
* const SDL_AssertData *item = SDL_GetAssertionReport();
|
|
* while (item) {
|
|
* printf("'%s', %s (%s:%d), triggered %u times, always ignore: %s.\\n",
|
|
* item->condition, item->function, item->filename,
|
|
* item->linenum, item->trigger_count,
|
|
* item->always_ignore ? "yes" : "no");
|
|
* item = item->next;
|
|
* }
|
|
* </code>
|
|
*
|
|
* \return List of all assertions.
|
|
* \sa SDL_ResetAssertionReport
|
|
*/
|
|
extern DECLSPEC const SDL_AssertData * SDLCALL SDL_GetAssertionReport(void);
|
|
|
|
/**
|
|
* \brief Reset the list of all assertion failures.
|
|
*
|
|
* Reset list of all assertions triggered.
|
|
*
|
|
* \sa SDL_GetAssertionReport
|
|
*/
|
|
extern DECLSPEC void SDLCALL SDL_ResetAssertionReport(void);
|
|
|
|
|
|
/* these had wrong naming conventions until 2.0.4. Please update your app! */
|
|
#define SDL_assert_state SDL_AssertState
|
|
#define SDL_assert_data SDL_AssertData
|
|
|
|
|
|
/* Ends C function definitions when using C++ */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#include "close_code.h"
|
|
|
|
#endif /* SDL_assert_h_ */
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|