// Created: 29/01/98
// RCS-ID: $Id$
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#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"
+#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
// (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
+//
+// 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
szFile and nLine - file name and line number of the ASSERT
szMsg - optional message explaining the reason
*/
- void WXDLLEXPORT wxOnAssert(const wxChar *szFile, int nLine, const wxChar *szMsg = (const wxChar *) NULL);
-
- /*
- 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"
- */
+ 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) if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__); else
+ #define wxASSERT(cond) wxAssert(!!(cond), __TFILE__, __LINE__, _T(#cond))
// assert with additional message explaining it's cause
#define wxASSERT_MSG(cond, msg) \
- if ( !(cond) ) wxOnAssert(__TFILE__, __LINE__, msg); else
+ 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__
+// Use of wxFalse instead of FALSE suppresses compiler warnings about testing
+// constant expression
+WXDLLIMPEXP_DATA_BASE(extern const bool) wxFalse;
+#define wxAssertFailure wxFalse
+
// special form of assert: always triggers it (in debug mode)
-#define wxFAIL wxASSERT(wxFalse)
+#define wxFAIL wxASSERT(wxAssertFailure)
// FAIL with some message
-#define wxFAIL_MSG(msg) wxASSERT_MSG(wxFalse, msg)
+#define wxFAIL_MSG(msg) wxASSERT_MSG(wxAssertFailure, msg)
// NB: the following macros work also in release mode!
#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...)
+//
+// 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 __WXMAC__
+ extern bool WXDLLIMPEXP_BASE wxIsDebuggerRunning();
+#else // !Mac
+ inline bool wxIsDebuggerRunning() { return false; }
+#endif // Mac/!Mac
+
#endif // _WX_DEBUG_H_
projects / wxWidgets.git / blobdiff