#define _WX_DEBUG_H_
#include <assert.h>
+#include <limits.h> // 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.
- <BR>
- <BR>
- <b>Warning</b>: if you don't like advices on programming style, don't read
- further! ;-)
- <BR>
- <BR>
- 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 (<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
+//
+// 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_
+
projects / wxWidgets.git / blobdiff