X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8b0bd21b3d4b68146272a124fcadfad02eba6599..a1061906dd3e6594753bf99fdedde7c72d9ca12e:/include/wx/debug.h diff --git a/include/wx/debug.h b/include/wx/debug.h index 85dee4be29..3d49a9e523 100644 --- a/include/wx/debug.h +++ b/include/wx/debug.h @@ -2,39 +2,65 @@ // 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__ +#include "wx/dlimpexp.h" // for WXDLLIMPEXP_FWD_BASE + +class WXDLLIMPEXP_FWD_BASE wxString; +class WXDLLIMPEXP_FWD_BASE wxCStrData; // ---------------------------------------------------------------------------- // Defines controlling the debugging macros // ---------------------------------------------------------------------------- -// if _DEBUG is defined (MS VC++ and others use it in debug builds), define -// __WXDEBUG__ too -#ifdef _DEBUG +/* + wxWidgets can be built with several different levels of debug support + specified by the value of wxDEBUG_LEVEL constant: + + 0: No assertion macros at all, this should only be used when optimizing + for resource-constrained systems (typically embedded ones). + 1: Default level, most of the assertions are enabled. + 2: Maximal (at least for now): asserts which are "expensive" + (performance-wise) or only make sense for finding errors in wxWidgets + itself, as opposed to bugs in applications using it, are also enabled. + */ + +// unless wxDEBUG_LEVEL is predefined (by configure or via wx/setup.h under +// Windows), use the default +#if !defined(wxDEBUG_LEVEL) + #define wxDEBUG_LEVEL 1 +#endif // !defined(wxDEBUG_LEVEL) + +/* + __WXDEBUG__ is defined when wxDEBUG_LEVEL != 0. This is done mostly for + compatibility but it also provides a simpler way to check if asserts and + debug logging is enabled at all. + */ +#if wxDEBUG_LEVEL > 0 #ifndef __WXDEBUG__ #define __WXDEBUG__ - #endif // !__WXDEBUG__ -#endif // _DEBUG - -// if NDEBUG is defined ( uses it), undef __WXDEBUG__ and WXDEBUG -#ifdef NDEBUG + #endif +#else #undef __WXDEBUG__ - #undef WXDEBUG -#endif // NDEBUG +#endif -// if __WXDEBUG__ is defined, make sure that WXDEBUG is defined and >= 1 +// Finally there is also a very old WXDEBUG macro not used anywhere at all, it +// is only defined for compatibility. #ifdef __WXDEBUG__ #if !defined(WXDEBUG) || !WXDEBUG #undef WXDEBUG @@ -43,110 +69,269 @@ #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. +// Handling assertion failures // ---------------------------------------------------------------------------- -// Macros which are completely disabled in 'release' mode +/* + Type for the function called in case of assert failure, see + wxSetAssertHandler(). + */ +typedef void (*wxAssertHandler_t)(const wxString& file, + int line, + const wxString& func, + const wxString& cond, + const wxString& msg); + +#if wxDEBUG_LEVEL + +// the global assert handler function, if it is NULL asserts don't check their +// conditions +extern WXDLLIMPEXP_DATA_BASE(wxAssertHandler_t) wxTheAssertHandler; + +/* + Sets the function to be called in case of assertion failure. + + The default assert handler forwards to wxApp::OnAssertFailure() whose + default behaviour is, in turn, to show the standard assertion failure + dialog if a wxApp object exists or shows the same dialog itself directly + otherwise. + + While usually it is enough -- and more convenient -- to just override + OnAssertFailure(), to handle all assertion failures, including those + occurring even before wxApp object creation or after its destruction you + need to provide your assertion handler function. + + This function also provides a simple way to disable all asserts: simply + pass NULL pointer to it. Doing this will result in not even evaluating + assert conditions at all, avoiding almost all run-time cost of asserts. + + Notice that this function is not MT-safe, so you should call it before + starting any other threads. + + The return value of this function is the previous assertion handler. It can + be called after any pre-processing by your handler and can also be restored + later if you uninstall your handler. + */ +inline wxAssertHandler_t wxSetAssertHandler(wxAssertHandler_t handler) +{ + const wxAssertHandler_t old = wxTheAssertHandler; + wxTheAssertHandler = handler; + return old; +} + +/* + Reset the default assert handler. + + This may be used to enable asserts, which are disabled by default in this + case, for programs built in release build (NDEBUG defined). + */ +extern void WXDLLIMPEXP_BASE wxSetDefaultAssertHandler(); + +#else // !wxDEBUG_LEVEL + +// provide empty stubs in case assertions are completely disabled // -// 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) - - 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" - */ - - // generic assert macro - #define wxASSERT(cond) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__); else - - // 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); +// NB: can't use WXUNUSED() here as we're included from wx/defs.h before it is +// defined +inline wxAssertHandler_t wxSetAssertHandler(wxAssertHandler_t /* handler */) +{ + return NULL; +} + +inline void wxSetDefaultAssertHandler() { } + +#endif // wxDEBUG_LEVEL/!wxDEBUG_LEVEL + +// simply a synonym for wxSetAssertHandler(NULL) +inline void wxDisableAsserts() { wxSetAssertHandler(NULL); } + +/* + A macro which disables asserts for applications compiled in release build. + + By default, wxIMPLEMENT_APP (or rather wxIMPLEMENT_WXWIN_MAIN) disable the + asserts in the applications compiled in the release build by calling this. + It does nothing if NDEBUG is not defined. + */ +#ifdef NDEBUG + #define wxDISABLE_ASSERTS_IN_RELEASE_BUILD() wxDisableAsserts() #else - #define wxTrap() + #define wxDISABLE_ASSERTS_IN_RELEASE_BUILD() +#endif - // 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__ +#if wxDEBUG_LEVEL -// Use of wxFalse instead of FALSE suppresses compiler warnings about testing -// constant expression -WXDLLEXPORT_DATA(extern const bool) wxFalse; +/* + wxOnAssert() is used by the debugging macros defined below. Different + overloads are needed because these macros can be used with or without _T(). + + All of them are implemented in src/common/appcmn.cpp and unconditionally + call wxTheAssertHandler so the caller must check that it is non-NULL + (assert macros do it). + */ + +#if wxUSE_UNICODE -// special form of assert: always triggers it (in debug mode) -#define wxFAIL wxASSERT(wxFalse) +// these overloads are the ones typically used by debugging macros: we have to +// provide wxChar* msg version because it's common to use _T() in the macros +// and finally, we can't use const wx(char)* msg = NULL, because that would +// be ambiguous +// +// also notice that these functions can't be inline as wxString is not defined +// yet (and can't be as wxString code itself may use assertions) +extern void WXDLLIMPEXP_BASE wxOnAssert(const char *file, + int line, + const char *func, + const char *cond); + +extern void WXDLLIMPEXP_BASE wxOnAssert(const char *file, + int line, + const char *func, + const char *cond, + const char *msg); + +extern void WXDLLIMPEXP_BASE wxOnAssert(const char *file, + int line, + const char *func, + const char *cond, + const wxChar *msg); +#endif /* wxUSE_UNICODE */ + +// this version is for compatibility with wx 2.8 Unicode build only, we don't +// use it ourselves any more except in ANSI-only build in which case it is all +// we need +extern void WXDLLIMPEXP_BASE wxOnAssert(const wxChar *file, + int line, + const char *func, + const wxChar *cond, + const wxChar *msg = NULL); + +// these overloads work when msg passed to debug macro is a string and 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& file, + int line, + const wxString& func, + const wxString& cond, + const wxString& msg); + +extern void WXDLLIMPEXP_BASE wxOnAssert(const wxString& file, + int line, + const wxString& func, + const wxString& cond); + +extern void WXDLLIMPEXP_BASE wxOnAssert(const char *file, + int line, + const char *func, + const char *cond, + const wxCStrData& msg); -// FAIL with some message -#define wxFAIL_MSG(msg) wxASSERT_MSG(wxFalse, msg) +extern void WXDLLIMPEXP_BASE wxOnAssert(const char *file, + int line, + const char *func, + const char *cond, + const wxString& msg); -// NB: the following macros work also in release mode! +#endif // wxDEBUG_LEVEL + + +// ---------------------------------------------------------------------------- +// Debugging macros +// ---------------------------------------------------------------------------- /* - 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!!") ) + Assertion macros: check if the condition is true and call assert handler + (which will by default notify the user about failure) if it isn't. + + wxASSERT and wxFAIL macros as well as wxTrap() function do nothing at all + if wxDEBUG_LEVEL is 0 however they do check their conditions at default + debug level 1, unlike the previous wxWidgets versions. + + wxASSERT_LEVEL_2 is meant to be used for "expensive" asserts which should + normally be disabled because they have a big impact on performance and so + this macro only does anything if wxDEBUG_LEVEL >= 2. + */ +#if wxDEBUG_LEVEL + // call this function to break into the debugger unconditionally (assuming + // the program is running under debugger, of course) + extern void WXDLLIMPEXP_BASE wxTrap(); + + // assert checks if the condition is true and calls the assert handler with + // the provided message if it isn't + // + // NB: the macro is defined like this to ensure that nested if/else + // statements containing it are compiled in the same way whether it is + // defined as empty or not; also notice that we can't use ";" instead + // of "{}" as some compilers warn about "possible unwanted ;" then + #define wxASSERT_MSG(cond, msg) \ + if ( !wxTheAssertHandler || (cond) ) \ + {} \ + else \ + wxOnAssert(__FILE__, __LINE__, __WXFUNCTION__, #cond, msg) + + // a version without any additional message, don't use unless condition + // itself is fully self-explanatory + #define wxASSERT(cond) wxASSERT_MSG(cond, (const char*)NULL) + + // wxFAIL is a special form of assert: it always triggers (and so is + // usually used in normally unreachable code) + #define wxFAIL_COND_MSG(cond, msg) \ + if ( !wxTheAssertHandler ) \ + {} \ + else \ + wxOnAssert(__FILE__, __LINE__, __WXFUNCTION__, cond, msg) + #define wxFAIL_MSG(msg) wxFAIL_COND_MSG("Assert failure", msg) + #define wxFAIL wxFAIL_MSG((const char*)NULL) +#else // !wxDEBUG_LEVEL + #define wxTrap() + + #define wxASSERT(cond) + #define wxASSERT_MSG(cond, msg) + #define wxFAIL + #define wxFAIL_MSG(msg) + #define wxFAIL_COND_MSG(cond, msg) +#endif // wxDEBUG_LEVEL + +#if wxDEBUG_LEVEL >= 2 + #define wxASSERT_LEVEL_2_MSG(cond, msg) wxASSERT_MSG(cond, msg) + #define wxASSERT_LEVEL_2(cond) wxASSERT(cond) +#else // wxDEBUG_LEVEL < 2 + #define wxASSERT_LEVEL_2_MSG(cond, msg) + #define wxASSERT_LEVEL_2(cond) +#endif + + +/* + wxCHECK macros always check their conditions, setting debug level to 0 only + makes them silent in case of failure, otherwise -- including at default + debug level 1 -- they call the assert handler if the condition is false + + They are supposed to be used only in invalid situation: for example, an + invalid parameter (e.g. a NULL pointer) is passed to a function. Instead of + dereferencing it and causing core dump the function might use + + wxCHECK_RET( p != NULL, "pointer can't be NULL" ) */ -// check that expression is true, "return" if not (also FAILs in debug mode) -#define wxCHECK(x, rc) if (!(x)) {wxFAIL; return rc; } +// the generic macro: takes the condition to check, the statement to be execute +// in case the condition is false and the message to pass to the assert handler +#define wxCHECK2_MSG(cond, op, msg) \ + if ( cond ) \ + {} \ + else \ + { \ + wxFAIL_COND_MSG(#cond, msg); \ + op; \ + } \ + struct wxDummyCheckStruct /* just to force a semicolon */ -// as wxCHECK but with a message explaining why we fail -#define wxCHECK_MSG(x, rc, msg) if (!(x)) {wxFAIL_MSG(msg); return rc; } +// check which returns with the specified return code if the condition fails +#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; } +// check that expression is true, "return" if not (also FAILs in debug mode) +#define wxCHECK(cond, rc) wxCHECK_MSG(cond, rc, (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; } +// check that expression is true, perform op if not +#define wxCHECK2(cond, op) wxCHECK2_MSG(cond, op, (const char*)NULL) // special form of wxCHECK2: as wxCHECK, but for use in void functions // @@ -154,7 +339,128 @@ 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 run-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); } \ + } +#elif defined( __VMS ) +namespace wxdebug{ + +// HP aCC cannot deal with missing names for template value parameters +template struct STATIC_ASSERTION_FAILURE; + +template <> struct STATIC_ASSERTION_FAILURE { enum { value = 1 }; }; + +// HP aCC cannot deal with missing names for template value parameters +template struct static_assert_test{}; + +} + #define WX_JOIN( X, Y ) X##Y + #define WX_STATIC_ASSERT_BOOL_CAST(x) (bool)(x) + #define wxCOMPILE_TIME_ASSERT(expr, msg) \ + typedef ::wxdebug::static_assert_test<\ + sizeof(::wxdebug::STATIC_ASSERTION_FAILURE< WX_STATIC_ASSERT_BOOL_CAST( expr ) >)>\ + WX_JOIN(wx_static_assert_typedef_, __LINE__) +#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. + */ +#if defined(__WXMAC__) || defined(__WIN32__) + extern bool WXDLLIMPEXP_BASE wxIsDebuggerRunning(); +#else // !Mac + inline bool wxIsDebuggerRunning() { return false; } +#endif // Mac/!Mac + +// 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 should no +// longer be used. +extern bool WXDLLIMPEXP_BASE wxAssertIsEqual(int x, int y); + +// Use of wxFalse instead of false suppresses compiler warnings about testing +// constant expression +extern WXDLLIMPEXP_DATA_BASE(const bool) wxFalse; + +#define wxAssertFailure wxFalse + +// This is similar to WXUNUSED() and useful for parameters which are only used +// in assertions. +#if wxDEBUG_LEVEL + #define WXUNUSED_UNLESS_DEBUG(param) param +#else + #define WXUNUSED_UNLESS_DEBUG(param) WXUNUSED(param) +#endif -#endif // _WX_DEBUG_H_ +#endif // _WX_DEBUG_H_