X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/749b01f03755465790549e7b94d2a6e2eaae193e..b771d06bade79af05559648a0cb13c59dcc0f8a8:/include/wx/debug.h diff --git a/include/wx/debug.h b/include/wx/debug.h index 82785eca9b..9dc2e1b3fd 100644 --- a/include/wx/debug.h +++ b/include/wx/debug.h @@ -2,123 +2,228 @@ // Name: wx/debug.h // Purpose: Misc debug functions and macros // Author: Vadim Zeitlin -// Modified by: // Created: 29/01/98 // RCS-ID: $Id$ -// Copyright: (c) 1998 Vadim Zeitlin -// Licence: wxWindows license +// Copyright: (c) 1998-2009 Vadim Zeitlin +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// -#ifndef _WX_DEBUG_H_ -#define _WX_DEBUG_H_ +#ifndef _WX_DEBUG_H_ +#define _WX_DEBUG_H_ -#include +#if !defined(__WXPALMOS5__) && !defined(__WXWINCE__) + #include +#endif // systems without assert.h -#include "wx/wxchar.h" +#include // for CHAR_BIT used below + +#include "wx/chartype.h" // for __TFILE__ and wxChar +#include "wx/cpp.h" // for __WXFUNCTION__ + +// ---------------------------------------------------------------------------- +// 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 +// All debugging macros rely on ASSERT() which in turn calls the 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 +// 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 +// 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 (without __WXDEBUG__ defined) build, so they add strictly +// 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. // ---------------------------------------------------------------------------- -// Use of these suppresses compiler warnings about testing constant expression -WXDLLEXPORT_DATA(extern const bool) wxTrue; -WXDLLEXPORT_DATA(extern const bool) wxFalse; - // Macros which are completely disabled in 'release' mode -#ifdef __WXDEBUG__ +// +// NB: these functions are implemented in src/common/appcmn.cpp +#if 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) + This function is called whenever one of debugging macros fails (i.e. + condition is false in an assertion). To customize its behaviour, override + wxApp::OnAssertFailure(). - parameters: + Parameters: szFile and nLine - file name and line number of the ASSERT + szFunc - function name of the ASSERT, may be NULL (NB: ASCII) + szCond - text form of the condition which failed 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(); + /* this version is for compatibility with wx 2.8 Unicode build only: */ + extern void WXDLLIMPEXP_BASE wxOnAssert(const wxChar *szFile, + int nLine, + const char *szFunc, + const wxChar *szCond, + const wxChar *szMsg = NULL); - /* - notice the usage of else at the end of wxASSERT macro: this ensures that - the following code +#if wxUSE_UNICODE + /* char versions are used by debugging macros; we have to provide + wxChar* szMsg version because it's common to use _T() in the macros + and finally, we can't use const wx(char)* szMsg = NULL, because that + would be ambiguous: */ + extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile, + int nLine, + const char *szFunc, + const char *szCond); - if ( ... ) - wxASSERT(...); - else - ... + extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile, + int nLine, + const char *szFunc, + const char *szCond, + const char *szMsg); - works like expected: if there were no "else", the one in the code above - would be matched with a wrong "if" - */ + extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile, + int nLine, + const char *szFunc, + const char *szCond, + const wxChar *szMsg); +#endif /* wxUSE_UNICODE */ + + class WXDLLIMPEXP_FWD_BASE wxString; + class WXDLLIMPEXP_FWD_BASE wxCStrData; + + /* these two work when szMsg passed to debug macro is a string, + we also have to provide wxCStrData overload to resolve ambiguity + which would otherwise arise from wxASSERT( s.c_str() ): */ + extern void WXDLLIMPEXP_BASE wxOnAssert(const wxString& szFile, + int nLine, + const wxString& szFunc, + const wxString& szCond, + const wxString& szMsg); + + extern void WXDLLIMPEXP_BASE wxOnAssert(const wxString& szFile, + int nLine, + const wxString& szFunc, + const wxString& szCond); + + extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile, + int nLine, + const char *szFunc, + const char *szCond, + const wxCStrData& msg); + + extern void WXDLLIMPEXP_BASE wxOnAssert(const char *szFile, + int nLine, + const char *szFunc, + const char *szCond, + const wxString& szMsg); + + // call this function to break into the debugger unconditionally (assuming + // the program is running under debugger, of course) + extern void WXDLLIMPEXP_BASE wxTrap(); // generic assert macro - #define wxASSERT(cond) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__); else + #define wxASSERT(cond) wxASSERT_MSG(cond, (const char*)NULL) + + + // assert with additional message explaining its cause + + // Note: some compilers will give a warning (such as + // "possible unwanted ;") when using a ";" instead of the "{}". + #define wxASSERT_MSG(cond, msg) \ + if ( cond ) \ + {} \ + else \ + wxOnAssert(__FILE__, __LINE__, __WXFUNCTION__, #cond, msg) + + // special form of assert: always triggers it (in debug mode) + #define wxFAIL wxFAIL_MSG((const char*)NULL) + + // FAIL with some message + #define wxFAIL_MSG(msg) wxFAIL_COND_MSG("wxAssertFailure", msg) - // assert with additional message explaining it's cause - #define wxASSERT_MSG(cond, msg) \ - if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__, msg); else + // FAIL with some message and a condition + #define wxFAIL_COND_MSG(cond, msg) \ + wxOnAssert(__FILE__, __LINE__, __WXFUNCTION__, cond, msg) - // an assert helper used to avoid warning when testing constant expressions, + // 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); + // + // NB: this is made obsolete by wxCOMPILE_TIME_ASSERT() and should no + // longer be used. + extern bool WXDLLIMPEXP_BASE wxAssertIsEqual(int x, int y); #else #define wxTrap() - // nothing to do in release modes (hopefully at this moment there are + // nothing to do in release mode (hopefully at this moment there are // no more bugs ;-) #define wxASSERT(cond) - #define wxASSERT_MSG(x, m) -#endif //__WXDEBUG__ + #define wxASSERT_MSG(cond, msg) + #define wxFAIL + #define wxFAIL_MSG(msg) + #define wxFAIL_COND_MSG(cond, msg) +#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 +extern WXDLLIMPEXP_DATA_BASE(const bool) wxFalse; -// FAIL with some message -#define wxFAIL_MSG(msg) wxASSERT_MSG(wxFalse, msg) +#define wxAssertFailure wxFalse -// NB: the following macros work also in release mode! +// NB: the following macros also work 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 + invalid parameter (e.g. a 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; } +#define wxCHECK(cond, rc) wxCHECK_MSG(cond, rc, (const char*)NULL) // as wxCHECK but with a message explaining why we fail -#define wxCHECK_MSG(x, rc, msg) if (!(x)) {wxFAIL_MSG(msg); return rc; } +#define wxCHECK_MSG(cond, rc, msg) wxCHECK2_MSG(cond, return rc, msg) // check that expression is true, perform op if not -#define wxCHECK2(x, op) if (!(x)) {wxFAIL; op; } +#define wxCHECK2(cond, op) wxCHECK2_MSG(cond, op, (const char*)NULL) // as wxCHECK2 but with a message explaining why we fail -#define wxCHECK2_MSG(x, op, msg) if (!(x)) {wxFAIL_MSG(msg); op; } + +#define wxCHECK2_MSG(cond, op, msg) \ + if ( cond ) \ + {} \ + else \ + { \ + wxFAIL_COND_MSG(#cond, msg); \ + op; \ + } \ + struct wxDummyCheckStruct /* just to force a semicolon */ // special form of wxCHECK2: as wxCHECK, but for use in void functions // @@ -126,7 +231,84 @@ WXDLLEXPORT_DATA(extern const bool) wxFalse; // 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 wxCHECK_RET(cond, msg) wxCHECK2_MSG(cond, return, msg) + +// ---------------------------------------------------------------------------- +// 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. +*/ +#if defined(__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. -#endif // _WX_DEBUG_H_ + Currently this only really works under Win32 and Mac in CodeWarrior builds, + it always returns false in other cases. + */ +#if defined(__WXMAC__) || defined(__WIN32__) + extern bool WXDLLIMPEXP_BASE wxIsDebuggerRunning(); +#else // !Mac + inline bool wxIsDebuggerRunning() { return false; } +#endif // Mac/!Mac +#endif // _WX_DEBUG_H_