X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f6bcfd974ef26faf6f91a62cac09827e09463fd1..f9a853668ade1b3cbd187737cb234973c72a1088:/include/wx/debug.h diff --git a/include/wx/debug.h b/include/wx/debug.h index 4cb9dd165d..436a05ab29 100644 --- a/include/wx/debug.h +++ b/include/wx/debug.h @@ -13,98 +13,198 @@ #define _WX_DEBUG_H_ #include +#include // for CHAR_BIT used below -#include "wx/wxchar.h" +#include "wx/wxchar.h" // for __TFILE__ and wxChar // ---------------------------------------------------------------------------- -/** - @name 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 advices on programming style, don't read - further! ;-) -
-
- Extensive use of these macros is recommended! Remember that ASSERTs are - disabled in final (without __WXDEBUG__ defined) build, 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. - - @memo Debugging macros (replacement for standard assert()) and more. - */ +// Defines controlling the debugging macros // ---------------------------------------------------------------------------- -//@{ -// Use of these suppresses compiler warnings about testing constant expression -WXDLLEXPORT_DATA(extern const bool) wxTrue; -WXDLLEXPORT_DATA(extern const bool) wxFalse; +// 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 advices on programming style, don't read +// further! ;-) +// +// Extensive use of these macros is recommended! Remember that ASSERTs are +// disabled in final (without __WXDEBUG__ defined) build, 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. +// ---------------------------------------------------------------------------- -/** @name Macros which are completely disabled in 'release' mode */ -//@{ +// Macros which are completely disabled in 'release' mode +// +// NB: these functions are implemented in src/common/appcmn.cpp #ifdef __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) - @param szFile and nLine - file name and line number of the ASSERT - szMsg - optional message explaining the reason + /* + 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 WXDLLEXPORT wxOnAssert(const wxChar *szFile, + int nLine, + const wxChar *szMsg = NULL); + + // call this function to break into the debugger uncodnitionally (assuming + // the program is running under debugger, of course) + extern void WXDLLEXPORT wxTrap(); + + /* + notice the usage of else at the end of wxASSERT macro: this ensures that + the following code + + if ( ... ) + wxASSERT(...); + else + ... + + works like expected: if there were no "else", the one in the code above + would be matched with a wrong "if" */ - void WXDLLEXPORT wxOnAssert(const wxChar *szFile, int nLine, const wxChar *szMsg = (const wxChar *) NULL); - /// generic assert macro - #define wxASSERT(cond) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__) + // generic assert macro + #define wxASSERT(cond) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__); else - /// assert with additional message explaining it's cause - #define wxASSERT_MSG(x, m) if ( !(x) ) wxOnAssert(__TFILE__, __LINE__, m) + // assert with additional message explaining it's cause + #define wxASSERT_MSG(cond, msg) \ + if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__, msg); else + + // 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) ) + extern bool WXDLLEXPORT 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) + #define wxASSERT(cond) + #define wxASSERT_MSG(x, m) #endif //__WXDEBUG__ -/// special form of assert: always triggers it (in debug mode) -#define wxFAIL wxASSERT(wxFalse) +// Use of wxFalse instead of FALSE suppresses compiler warnings about testing +// constant expression +WXDLLEXPORT_DATA(extern const bool) wxFalse; + +// special form of assert: always triggers it (in debug mode) +#define wxFAIL wxASSERT(wxFalse) -/// FAIL with some message -#define wxFAIL_MSG(msg) wxASSERT_MSG(wxFalse, msg) -//@} +// FAIL with some message +#define wxFAIL_MSG(msg) wxASSERT_MSG(wxFalse, msg) -// NB: these macros work also in release mode! +// 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; } - @name Macros which remain even in 'release' mode +// 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_ASSERT_NAME_HELPER(line) wxAssert_ ## line +#define wxMAKE_ASSERT_NAME(line) wxMAKE_ASSERT_NAME_HELPER(line) +#define wxMAKE_UNIQUE_ASSERT_NAME wxMAKE_ASSERT_NAME(__LINE__) +#define wxMAKE_UNIQUE_ASSERT_NAME2(text) wxMAKE_ASSERT_NAME(text) + +/* + 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. */ -//@{ - /// 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; } -//@} - -//@} +#define wxCOMPILE_TIME_ASSERT(expr, msg) \ + struct wxMAKE_UNIQUE_ASSERT_NAME { unsigned int msg: expr; } + +#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)) #endif // _WX_DEBUG_H_ +