3434b611aa
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18153 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
223 lines
8.9 KiB
C
223 lines
8.9 KiB
C
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/debug.h
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// Purpose: Misc debug functions and macros
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 29/01/98
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// RCS-ID: $Id$
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_DEBUG_H_
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#define _WX_DEBUG_H_
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#ifndef __WXWINCE__
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#include <assert.h>
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#endif
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#include <limits.h> // for CHAR_BIT used below
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#include "wx/wxchar.h" // for __TFILE__ and wxChar
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// ----------------------------------------------------------------------------
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// Defines controlling the debugging macros
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// ----------------------------------------------------------------------------
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// if _DEBUG is defined (MS VC++ and others use it in debug builds), define
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// __WXDEBUG__ too
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#ifdef _DEBUG
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#ifndef __WXDEBUG__
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#define __WXDEBUG__
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#endif // !__WXDEBUG__
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#endif // _DEBUG
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// if NDEBUG is defined (<assert.h> uses it), undef __WXDEBUG__ and WXDEBUG
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#ifdef NDEBUG
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#undef __WXDEBUG__
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#undef WXDEBUG
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#endif // NDEBUG
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// if __WXDEBUG__ is defined, make sure that WXDEBUG is defined and >= 1
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#ifdef __WXDEBUG__
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#if !defined(WXDEBUG) || !WXDEBUG
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#undef WXDEBUG
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#define WXDEBUG 1
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#endif // !WXDEBUG
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#endif // __WXDEBUG__
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// ----------------------------------------------------------------------------
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// Debugging macros
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//
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// All debugging macros rely on ASSERT() which in turn calls user-defined
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// OnAssert() function. To keep things simple, it's called even when the
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// expression is TRUE (i.e. everything is ok) and by default does nothing: just
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// returns the same value back. But if you redefine it to do something more sexy
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// (popping up a message box in your favourite GUI, sending you e-mail or
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// whatever) it will affect all ASSERTs, FAILs and CHECKs in your code.
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//
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// Warning: if you don't like advices on programming style, don't read
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// further! ;-)
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//
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// Extensive use of these macros is recommended! Remember that ASSERTs are
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// disabled in final (without __WXDEBUG__ defined) build, so they add strictly
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// nothing to your program's code. On the other hand, CHECK macros do stay
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// even in release builds, but in general are not much of a burden, while
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// a judicious use of them might increase your program's stability.
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// ----------------------------------------------------------------------------
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// Macros which are completely disabled in 'release' mode
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//
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// NB: these functions are implemented in src/common/appcmn.cpp
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#ifdef __WXDEBUG__
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/*
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this function may be redefined to do something non trivial and is called
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whenever one of debugging macros fails (i.e. condition is false in an
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assertion)
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parameters:
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szFile and nLine - file name and line number of the ASSERT
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szMsg - optional message explaining the reason
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*/
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extern void WXDLLEXPORT wxOnAssert(const wxChar *szFile,
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int nLine,
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const wxChar *szCond,
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const wxChar *szMsg = NULL);
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// call this function to break into the debugger uncodnitionally (assuming
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// the program is running under debugger, of course)
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extern void WXDLLEXPORT wxTrap();
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// helper function used to implement wxASSERT and wxASSERT_MSG
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//
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// note using "int" and not "bool" for cond to avoid VC++ warnings about
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// implicit conversions when doing "wxAssert( pointer )" and also use of
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// "!!cond" below to ensure that everything is converted to int
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extern void WXDLLEXPORT wxAssert(int cond,
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const wxChar *szFile,
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int nLine,
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const wxChar *szCond,
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const wxChar *szMsg = NULL) ;
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// generic assert macro
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#define wxASSERT(cond) wxAssert(!!(cond), __TFILE__, __LINE__, _T(#cond))
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// assert with additional message explaining it's cause
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#define wxASSERT_MSG(cond, msg) \
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wxAssert(!!(cond), __TFILE__, __LINE__, _T(#cond), msg)
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// an assert helper used to avoid warning when testing constant expressions,
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// i.e. wxASSERT( sizeof(int) == 4 ) can generate a compiler warning about
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// expression being always true, but not using
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// wxASSERT( wxAssertIsEqual(sizeof(int), 4) )
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//
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// NB: this is made obsolete by wxCOMPILE_TIME_ASSERT() and shouldn't be
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// used any longer
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extern bool WXDLLEXPORT wxAssertIsEqual(int x, int y);
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#else
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#define wxTrap()
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// nothing to do in release modes (hopefully at this moment there are
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// no more bugs ;-)
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#define wxASSERT(cond)
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#define wxASSERT_MSG(x, m)
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#endif //__WXDEBUG__
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// Use of wxFalse instead of FALSE suppresses compiler warnings about testing
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// constant expression
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WXDLLEXPORT_DATA(extern const bool) wxFalse;
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#define wxAssertFailure wxFalse
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// special form of assert: always triggers it (in debug mode)
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#define wxFAIL wxASSERT(wxAssertFailure)
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// FAIL with some message
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#define wxFAIL_MSG(msg) wxASSERT_MSG(wxAssertFailure, msg)
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// NB: the following macros work also in release mode!
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/*
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These macros must be used only in invalid situation: for example, an
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invalid parameter (NULL pointer) is passed to a function. Instead of
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dereferencing it and causing core dump the function might try using
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CHECK( p != NULL ) or CHECK( p != NULL, return LogError("p is NULL!!") )
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*/
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// check that expression is true, "return" if not (also FAILs in debug mode)
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#define wxCHECK(x, rc) if (!(x)) {wxFAIL; return rc; }
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// as wxCHECK but with a message explaining why we fail
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#define wxCHECK_MSG(x, rc, msg) if (!(x)) {wxFAIL_MSG(msg); return rc; }
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// check that expression is true, perform op if not
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#define wxCHECK2(x, op) if (!(x)) {wxFAIL; op; }
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// as wxCHECK2 but with a message explaining why we fail
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#define wxCHECK2_MSG(x, op, msg) if (!(x)) {wxFAIL_MSG(msg); op; }
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// special form of wxCHECK2: as wxCHECK, but for use in void functions
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//
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// NB: there is only one form (with msg parameter) and it's intentional:
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// there is no other way to tell the caller what exactly went wrong
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// from the void function (of course, the function shouldn't be void
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// to begin with...)
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#define wxCHECK_RET(x, msg) if (!(x)) {wxFAIL_MSG(msg); return; }
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// ----------------------------------------------------------------------------
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// Compile time asserts
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//
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// Unlike the normal assert and related macros above which are checked during
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// the program tun-time the macros below will result in a compilation error if
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// the condition they check is false. This is usually used to check the
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// expressions containing sizeof()s which cannot be tested with the
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// preprocessor. If you can use the #if's, do use them as you can give a more
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// detailed error message then.
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// ----------------------------------------------------------------------------
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/*
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How this works (you don't have to understand it to be able to use the
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macros): we rely on the fact that it is invalid to define a named bit field
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in a struct of width 0. All the rest are just the hacks to minimize the
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possibility of the compiler warnings when compiling this macro: in
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particular, this is why we define a struct and not an object (which would
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result in a warning about unused variable) and a named struct (otherwise we'd
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get a warning about an unnamed struct not used to define an object!).
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The _n__ part is to stop VC++ 7 being confused since it encloses __LINE++ in
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parentheses. Unfortunately this does not work with other compilers, so
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we will only enable it when we know the _precise_ symbols to test for.
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*/
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#define wxMAKE_ASSERT_NAME_HELPER(line) wxAssert_ ## line
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#define wxMAKE_ASSERT_NAME(line) wxMAKE_ASSERT_NAME_HELPER(line)
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#if 0
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#define wxMAKE_UNIQUE_ASSERT_NAME wxMAKE_ASSERT_NAME(_n___ ## __LINE__)
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#else
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#define wxMAKE_UNIQUE_ASSERT_NAME wxMAKE_ASSERT_NAME(__LINE__)
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#endif
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#define wxMAKE_UNIQUE_ASSERT_NAME2(text) wxMAKE_ASSERT_NAME(text)
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/*
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The second argument of this macro must be a valid C++ identifier and not a
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string. I.e. you should use it like this:
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wxCOMPILE_TIME_ASSERT( sizeof(int) >= 2, YourIntsAreTooSmall );
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It may be used both within a function and in the global scope.
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*/
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#define wxCOMPILE_TIME_ASSERT(expr, msg) \
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struct wxMAKE_UNIQUE_ASSERT_NAME { unsigned int msg: expr; }
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#define wxCOMPILE_TIME_ASSERT2(expr, msg, text) \
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struct wxMAKE_UNIQUE_ASSERT_NAME2(text) { unsigned int msg: expr; }
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// helpers for wxCOMPILE_TIME_ASSERT below, for private use only
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#define wxMAKE_BITSIZE_MSG(type, size) type ## SmallerThan ## size ## Bits
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// a special case of compile time assert: check that the size of the given type
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// is at least the given number of bits
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#define wxASSERT_MIN_BITSIZE(type, size) \
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wxCOMPILE_TIME_ASSERT(sizeof(type) * CHAR_BIT >= size, \
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wxMAKE_BITSIZE_MSG(type, size))
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#endif // _WX_DEBUG_H_
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