SDL 2.0
SDL_assert.h File Reference
#include "SDL_stdinc.h"
#include "begin_code.h"
#include <signal.h>
#include "close_code.h"
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Data Structures

struct  SDL_AssertData
 

Macros

#define SDL_ASSERT_LEVEL   1
 
#define SDL_TriggerBreakpoint()   raise(SIGTRAP)
 
#define SDL_FUNCTION   "???"
 
#define SDL_FILE   __FILE__
 
#define SDL_LINE   __LINE__
 
#define SDL_NULL_WHILE_LOOP_CONDITION   (0)
 
#define SDL_disabled_assert(condition)    do { (void) sizeof ((condition)); } while (SDL_NULL_WHILE_LOOP_CONDITION)
 
#define SDL_enabled_assert(condition)
 
#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)
 
#define SDL_assert_always(condition)   SDL_enabled_assert(condition)
 
#define SDL_assert_state   SDL_AssertState
 
#define SDL_assert_data   SDL_AssertData
 

Typedefs

typedef SDL_AssertState(* SDL_AssertionHandler) (const SDL_AssertData *data, void *userdata)
 

Enumerations

enum  SDL_AssertState {
  SDL_ASSERTION_RETRY ,
  SDL_ASSERTION_BREAK ,
  SDL_ASSERTION_ABORT ,
  SDL_ASSERTION_IGNORE ,
  SDL_ASSERTION_ALWAYS_IGNORE
}
 

Functions

SDL_AssertState SDL_ReportAssertion (SDL_AssertData *, const char *, const char *, int)
 
void SDL_SetAssertionHandler (SDL_AssertionHandler handler, void *userdata)
 
SDL_AssertionHandler SDL_GetDefaultAssertionHandler (void)
 
SDL_AssertionHandler SDL_GetAssertionHandler (void **puserdata)
 
const SDL_AssertDataSDL_GetAssertionReport (void)
 
void SDL_ResetAssertionReport (void)
 

Macro Definition Documentation

◆ SDL_assert

#define SDL_assert (   condition)    SDL_disabled_assert(condition)

Definition at line 169 of file SDL_assert.h.

◆ SDL_assert_always

#define SDL_assert_always (   condition)    SDL_enabled_assert(condition)

Definition at line 189 of file SDL_assert.h.

◆ SDL_assert_data

#define SDL_assert_data   SDL_AssertData

Definition at line 313 of file SDL_assert.h.

◆ SDL_ASSERT_LEVEL

#define SDL_ASSERT_LEVEL   1

Definition at line 40 of file SDL_assert.h.

◆ SDL_assert_paranoid

#define SDL_assert_paranoid (   condition)    SDL_disabled_assert(condition)

Definition at line 171 of file SDL_assert.h.

◆ SDL_assert_release

#define SDL_assert_release (   condition)    SDL_disabled_assert(condition)

Definition at line 170 of file SDL_assert.h.

◆ SDL_assert_state

#define SDL_assert_state   SDL_AssertState

Definition at line 312 of file SDL_assert.h.

◆ SDL_disabled_assert

#define SDL_disabled_assert (   condition)     do { (void) sizeof ((condition)); } while (SDL_NULL_WHILE_LOOP_CONDITION)

Definition at line 109 of file SDL_assert.h.

110 { (void) sizeof ((condition)); } while (SDL_NULL_WHILE_LOOP_CONDITION)
#define SDL_NULL_WHILE_LOOP_CONDITION
Definition SDL_assert.h:106

◆ SDL_enabled_assert

#define SDL_enabled_assert (   condition)
Value:
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. */ \
} \
SDL_AssertState
Definition SDL_assert.h:113
@ SDL_ASSERTION_RETRY
Definition SDL_assert.h:114
@ SDL_ASSERTION_BREAK
Definition SDL_assert.h:115
#define SDL_FILE
Definition SDL_assert.h:83
SDL_AssertState SDL_ReportAssertion(SDL_AssertData *, const char *, const char *, int)
#define SDL_FUNCTION
Definition SDL_assert.h:81
#define SDL_LINE
Definition SDL_assert.h:84
const char * condition
Definition SDL_assert.h:125

Definition at line 153 of file SDL_assert.h.

154 { \
155 while ( !(condition) ) { \
156 static struct SDL_AssertData sdl_assert_data = { 0, 0, #condition, 0, 0, 0, 0 }; \
157 const SDL_AssertState sdl_assert_state = SDL_ReportAssertion(&sdl_assert_data, SDL_FUNCTION, SDL_FILE, SDL_LINE); \
158 if (sdl_assert_state == SDL_ASSERTION_RETRY) { \
159 continue; /* go again. */ \
160 } else if (sdl_assert_state == SDL_ASSERTION_BREAK) { \
161 SDL_TriggerBreakpoint(); \
162 } \
163 break; /* not retrying. */ \
164 } \

◆ SDL_FILE

#define SDL_FILE   __FILE__

Definition at line 83 of file SDL_assert.h.

◆ SDL_FUNCTION

#define SDL_FUNCTION   "???"

Definition at line 81 of file SDL_assert.h.

◆ SDL_LINE

#define SDL_LINE   __LINE__

Definition at line 84 of file SDL_assert.h.

◆ SDL_NULL_WHILE_LOOP_CONDITION

#define SDL_NULL_WHILE_LOOP_CONDITION   (0)

Definition at line 106 of file SDL_assert.h.

◆ SDL_TriggerBreakpoint

#define SDL_TriggerBreakpoint ( )    raise(SIGTRAP)

Definition at line 70 of file SDL_assert.h.

Typedef Documentation

◆ SDL_AssertionHandler

typedef SDL_AssertState(* SDL_AssertionHandler) (const SDL_AssertData *data, void *userdata)

A callback that fires when an SDL assertion fails.

Parameters
dataa pointer to the SDL_AssertData structure corresponding to the current assertion.
userdatawhat was passed as userdata to SDL_SetAssertionHandler().
Returns
an SDL_AssertState value indicating how to handle the failure.

Definition at line 200 of file SDL_assert.h.

Enumeration Type Documentation

◆ SDL_AssertState

Enumerator
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.

Definition at line 112 of file SDL_assert.h.

113{
114 SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */
115 SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */
116 SDL_ASSERTION_ABORT, /**< Terminate the program. */
117 SDL_ASSERTION_IGNORE, /**< Ignore the assert. */
118 SDL_ASSERTION_ALWAYS_IGNORE /**< Ignore the assert from now on. */
@ SDL_ASSERTION_ABORT
Definition SDL_assert.h:116
@ SDL_ASSERTION_IGNORE
Definition SDL_assert.h:117
@ SDL_ASSERTION_ALWAYS_IGNORE
Definition SDL_assert.h:118

Function Documentation

◆ SDL_GetAssertionHandler()

SDL_AssertionHandler SDL_GetAssertionHandler ( void **  puserdata)
extern

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().

The parameter puserdata is a 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.

Parameters
puserdatapointer which is filled with the "userdata" pointer that was passed to SDL_SetAssertionHandler().
Returns
the SDL_AssertionHandler that is called when an assert triggers.
Since
This function is available since SDL 2.0.2.
See also
SDL_SetAssertionHandler

◆ SDL_GetAssertionReport()

const SDL_AssertData * SDL_GetAssertionReport ( void  )
extern

Get a list of all assertion failures.

This function gets all assertions triggered since the last call to SDL_ResetAssertionReport(), or the start of the program.

The proper way to examine this data looks something like this:

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;
}
const SDL_AssertData * SDL_GetAssertionReport(void)
const struct SDL_AssertData * next
Definition SDL_assert.h:129
unsigned int trigger_count
Definition SDL_assert.h:124
const char * function
Definition SDL_assert.h:128
const char * filename
Definition SDL_assert.h:126
Returns
a list of all failed assertions or NULL if the list is empty. This memory should not be modified or freed by the application.
Since
This function is available since SDL 2.0.0.
See also
SDL_ResetAssertionReport

◆ SDL_GetDefaultAssertionHandler()

SDL_AssertionHandler SDL_GetDefaultAssertionHandler ( void  )
extern

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.

Returns
the default SDL_AssertionHandler that is called when an assert triggers.
Since
This function is available since SDL 2.0.2.
See also
SDL_GetAssertionHandler

◆ SDL_ReportAssertion()

SDL_AssertState SDL_ReportAssertion ( SDL_AssertData ,
const char *  ,
const char *  ,
int   
)
extern

◆ SDL_ResetAssertionReport()

void SDL_ResetAssertionReport ( void  )
extern

Clear the list of all assertion failures.

This function will clear the list of all assertions triggered up to that point. Immediately following this call, SDL_GetAssertionReport will return no items. In addition, any previously-triggered assertions will be reset to a trigger_count of zero, and their always_ignore state will be false.

Since
This function is available since SDL 2.0.0.
See also
SDL_GetAssertionReport

◆ SDL_SetAssertionHandler()

void SDL_SetAssertionHandler ( SDL_AssertionHandler  handler,
void *  userdata 
)
extern

Set an application-defined assertion handler.

This function allows an application to show its own assertion UI and/or force the response to an assertion failure. If the application 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.

This callback is NOT reset to SDL's internal handler upon SDL_Quit()!

Parameters
handlerthe SDL_AssertionHandler function to call when an assertion fails or NULL for the default handler.
userdataa pointer that is passed to handler.
Since
This function is available since SDL 2.0.0.
See also
SDL_GetAssertionHandler