/** * 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 * 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 #endif #include /* 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 ( 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 */ extern WXDLLIMPEXP_DATA_BASE(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. */ #ifdef __WATCOMC__ /* avoid "unused symbol" warning */ #define wxCOMPILE_TIME_ASSERT(expr, msg) \ class wxMAKE_UNIQUE_ASSERT_NAME { \ unsigned int msg: expr; \ wxMAKE_UNIQUE_ASSERT_NAME() { wxUnusedVar(msg); } \ } #else #define wxCOMPILE_TIME_ASSERT(expr, msg) \ struct wxMAKE_UNIQUE_ASSERT_NAME { unsigned int msg: expr; } #endif /* 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 Win32 and Mac in CodeWarrior builds, it always returns false in other cases. */ #ifdef __cplusplus /* ABX: check __WIN32__ instead of __WXMSW__ for the same MSWBase in any Win32 port */ #if defined(__WXMAC__) || defined(__WIN32__) extern bool WXDLLIMPEXP_BASE wxIsDebuggerRunning(); #else /* !Mac */ inline bool wxIsDebuggerRunning() { return false; } #endif /* Mac/!Mac */ #endif /* __cplusplus */ #endif /* _WX_DEBUG_H_ */