wxWidgets/include/wx/debug.h

241 lines
9.7 KiB
C

/**
* Name: wx/debug.h
* Purpose: Misc debug functions and macros
* Author: Vadim Zeitlin
* Modified by: Ryan Norton (Converted to C)
* Created: 29/01/98
* RCS-ID: $Id$
* Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
* Licence: wxWindows licence
*/
/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
#ifndef _WX_DEBUG_H_
#define _WX_DEBUG_H_
#ifndef __WXWINCE__
#include <assert.h>
#endif
#include <limits.h> /* for CHAR_BIT used below */
#include "wx/wxchar.h" /* for __TFILE__ and wxChar */
/* ---------------------------------------------------------------------------- */
/* Defines controlling the debugging macros */
/* ---------------------------------------------------------------------------- */
/* if _DEBUG is defined (MS VC++ and others use it in debug builds), define */
/* __WXDEBUG__ too */
#ifdef _DEBUG
#ifndef __WXDEBUG__
#define __WXDEBUG__
#endif /* !__WXDEBUG__ */
#endif /* _DEBUG */
/* if NDEBUG is defined (<assert.h> uses it), undef __WXDEBUG__ and WXDEBUG */
#ifdef NDEBUG
#undef __WXDEBUG__
#undef WXDEBUG
#endif /* NDEBUG */
/* if __WXDEBUG__ is defined, make sure that WXDEBUG is defined and >= 1 */
#ifdef __WXDEBUG__
#if !defined(WXDEBUG) || !WXDEBUG
#undef WXDEBUG
#define WXDEBUG 1
#endif /* !WXDEBUG */
#endif /* __WXDEBUG__ */
/* ---------------------------------------------------------------------------- */
/* Debugging macros */
/* */
/* All debugging macros rely on ASSERT() which in turn calls user-defined */
/* OnAssert() function. To keep things simple, it's called even when the */
/* expression is true (i.e. everything is ok) and by default does nothing: just */
/* returns the same value back. But if you redefine it to do something more sexy */
/* (popping up a message box in your favourite GUI, sending you e-mail or */
/* whatever) it will affect all ASSERTs, FAILs and CHECKs in your code. */
/* */
/* Warning: if you don't like advice on programming style, don't read */
/* further! ;-) */
/* */
/* Extensive use of these macros is recommended! Remember that ASSERTs are */
/* disabled in final build (without __WXDEBUG__ defined), so they add strictly */
/* nothing to your program's code. On the other hand, CHECK macros do stay */
/* even in release builds, but in general are not much of a burden, while */
/* a judicious use of them might increase your program's stability. */
/* ---------------------------------------------------------------------------- */
/* Macros which are completely disabled in 'release' mode */
/* */
/* NB: these functions are implemented in src/common/appcmn.cpp */
#if defined(__cplusplus) && defined(__WXDEBUG__)
/*
this function may be redefined to do something non trivial and is called
whenever one of debugging macros fails (i.e. condition is false in an
assertion)
parameters:
szFile and nLine - file name and line number of the ASSERT
szMsg - optional message explaining the reason
*/
extern void WXDLLIMPEXP_BASE wxOnAssert(const wxChar *szFile,
int nLine,
const wxChar *szCond,
const wxChar *szMsg = NULL);
/* call this function to break into the debugger unconditionally (assuming */
/* the program is running under debugger, of course) */
extern void WXDLLIMPEXP_BASE wxTrap();
/* helper function used to implement wxASSERT and wxASSERT_MSG */
/* */
/* note using "int" and not "bool" for cond to avoid VC++ warnings about */
/* implicit conversions when doing "wxAssert( pointer )" and also use of */
/* "!!cond" below to ensure that everything is converted to int */
extern void WXDLLIMPEXP_BASE wxAssert(int cond,
const wxChar *szFile,
int nLine,
const wxChar *szCond,
const wxChar *szMsg = NULL) ;
/* generic assert macro */
#define wxASSERT(cond) wxAssert(!!(cond), __TFILE__, __LINE__, _T(#cond))
/* assert with additional message explaining it's cause */
#define wxASSERT_MSG(cond, msg) \
wxAssert(!!(cond), __TFILE__, __LINE__, _T(#cond), msg)
/* an assert helper used to avoid warning when testing constant expressions, */
/* i.e. wxASSERT( sizeof(int) == 4 ) can generate a compiler warning about */
/* expression being always true, but not using */
/* wxASSERT( wxAssertIsEqual(sizeof(int), 4) ) */
/* */
/* NB: this is made obsolete by wxCOMPILE_TIME_ASSERT() and shouldn't be */
/* used any longer */
extern bool WXDLLIMPEXP_BASE wxAssertIsEqual(int x, int y);
#else
#define wxTrap()
/* nothing to do in release modes (hopefully at this moment there are */
/* no more bugs ;-) */
#define wxASSERT(cond)
#define wxASSERT_MSG(x, m)
#endif /* __WXDEBUG__ */
#ifdef __cplusplus
/* Use of wxFalse instead of false suppresses compiler warnings about testing */
/* constant expression */
WXDLLIMPEXP_DATA_BASE(extern const bool) wxFalse;
#endif
#define wxAssertFailure wxFalse
/* special form of assert: always triggers it (in debug mode) */
#define wxFAIL wxASSERT(wxAssertFailure)
/* FAIL with some message */
#define wxFAIL_MSG(msg) wxASSERT_MSG(wxAssertFailure, msg)
/* NB: the following macros work also in release mode! */
/*
These macros must be used only in invalid situation: for example, an
invalid parameter (NULL pointer) is passed to a function. Instead of
dereferencing it and causing core dump the function might try using
CHECK( p != NULL ) or CHECK( p != NULL, return LogError("p is NULL!!") )
*/
/* check that expression is true, "return" if not (also FAILs in debug mode) */
#define wxCHECK(x, rc) if (!(x)) {wxFAIL; return rc; }
/* as wxCHECK but with a message explaining why we fail */
#define wxCHECK_MSG(x, rc, msg) if (!(x)) {wxFAIL_MSG(msg); return rc; }
/* check that expression is true, perform op if not */
#define wxCHECK2(x, op) if (!(x)) {wxFAIL; op; }
/* as wxCHECK2 but with a message explaining why we fail */
#define wxCHECK2_MSG(x, op, msg) if (!(x)) {wxFAIL_MSG(msg); op; }
/* special form of wxCHECK2: as wxCHECK, but for use in void functions */
/* */
/* NB: there is only one form (with msg parameter) and it's intentional: */
/* there is no other way to tell the caller what exactly went wrong */
/* from the void function (of course, the function shouldn't be void */
/* to begin with...) */
#define wxCHECK_RET(x, msg) if (!(x)) {wxFAIL_MSG(msg); return; }
/* ---------------------------------------------------------------------------- */
/* Compile time asserts */
/* */
/* Unlike the normal assert and related macros above which are checked during */
/* the program tun-time the macros below will result in a compilation error if */
/* the condition they check is false. This is usually used to check the */
/* expressions containing sizeof()s which cannot be tested with the */
/* preprocessor. If you can use the #if's, do use them as you can give a more */
/* detailed error message then. */
/* ---------------------------------------------------------------------------- */
/*
How this works (you don't have to understand it to be able to use the
macros): we rely on the fact that it is invalid to define a named bit field
in a struct of width 0. All the rest are just the hacks to minimize the
possibility of the compiler warnings when compiling this macro: in
particular, this is why we define a struct and not an object (which would
result in a warning about unused variable) and a named struct (otherwise we'd
get a warning about an unnamed struct not used to define an object!).
*/
#define wxMAKE_UNIQUE_ASSERT_NAME wxMAKE_UNIQUE_NAME(wxAssert_)
/*
The second argument of this macro must be a valid C++ identifier and not a
string. I.e. you should use it like this:
wxCOMPILE_TIME_ASSERT( sizeof(int) >= 2, YourIntsAreTooSmall );
It may be used both within a function and in the global scope.
*/
#define wxCOMPILE_TIME_ASSERT(expr, msg) \
struct wxMAKE_UNIQUE_ASSERT_NAME { unsigned int msg: expr; }
/*
When using VC++ 6 with "Edit and Continue" on, the compiler completely
mishandles __LINE__ and so wxCOMPILE_TIME_ASSERT() doesn't work, provide a
way to make "unique" assert names by specifying a unique prefix explicitly
*/
#define wxMAKE_UNIQUE_ASSERT_NAME2(text) wxCONCAT(wxAssert_, text)
#define wxCOMPILE_TIME_ASSERT2(expr, msg, text) \
struct wxMAKE_UNIQUE_ASSERT_NAME2(text) { unsigned int msg: expr; }
/* helpers for wxCOMPILE_TIME_ASSERT below, for private use only */
#define wxMAKE_BITSIZE_MSG(type, size) type ## SmallerThan ## size ## Bits
/* a special case of compile time assert: check that the size of the given type */
/* is at least the given number of bits */
#define wxASSERT_MIN_BITSIZE(type, size) \
wxCOMPILE_TIME_ASSERT(sizeof(type) * CHAR_BIT >= size, \
wxMAKE_BITSIZE_MSG(type, size))
/* ---------------------------------------------------------------------------- */
/* other miscellaneous debugger-related functions */
/* ---------------------------------------------------------------------------- */
/* return true if we're running under debugger */
/* */
/* currently this only really works under Mac in CodeWarrior builds, it always */
/* returns false otherwise */
#ifdef __cplusplus
#ifdef __WXMAC__
extern bool WXDLLIMPEXP_BASE wxIsDebuggerRunning();
#else /* !Mac */
inline bool wxIsDebuggerRunning() { return false; }
#endif /* Mac/!Mac */
#endif /* __cplusplus */
#endif /* _WX_DEBUG_H_ */