gecko-dev/xpcom/glue/nsDebug.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsDebug_h___
#define nsDebug_h___
#include "nsCom.h"
#include "prtypes.h"
#ifdef DEBUG
#define NS_DEBUG
#endif
/**
* Namespace for debugging methods. Note that your code must use the
* macros defined later in this file so that the debug code can be
* conditionally compiled out.
*/
/* in case this is included by a C file */
#ifdef __cplusplus
class nsDebug {
public:
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/**
* When called, this will log a fatal abort message (to stderr and
* to the NSPR log file) and then abort the program. This is
* used by the NS_ABORT_IF_FALSE macro below when debugging is
* enabled.
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*/
static NS_COM void AbortIfFalse(const char* aStr, const char* aExpr,
const char* aFile, PRIntn aLine);
/**
* Log a warning message when an expression is not true. Used by
* the NS_WARN_IF_FALSE macro below when debugging is enabled.
*
* The default behavior of this method is print a message to stderr
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* and to log an event in the NSPR log file.
*/
static NS_COM PRBool WarnIfFalse(const char* aStr, const char* aExpr,
const char* aFile, PRIntn aLine);
/**
* Enable flying a warning message box (if the platform supports
* such a thing) when WarnIfFalse is called in addition to
* the usual printing to stderr and the NSPR log file.
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*
* If aOnOff is PR_TRUE then the message-box is enabled, otherwise
* the message-box is disabled.
*
* The default state for the message-box enable is "off".
*
* Note also that the implementation looks at an environment
* variable (for those platforms that have environment variables...)
* called MOZ_WARNING_MESSAGE_BOX that when set enables the
* warning message box by default.
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*/
static NS_COM void SetWarningMessageBoxEnable(PRBool aOnOff);
/**
* Get the current setting of the message-box enable.
*/
static NS_COM PRBool GetWarningMessageBoxEnable(void);
// Note: Methods below this line are the old ones; please start using
// the new ones. The old ones will be removed eventually!
//////////////////////////////////////////////////////////////////////
// XXX add in log controls here
// XXX probably want printf type arguments
/**
* Abort the executing program. This works on all architectures.
*/
static NS_COM void Abort(const char* aFile, PRIntn aLine);
/**
* Break the executing program into the debugger.
*/
static NS_COM void Break(const char* aFile, PRIntn aLine);
/**
* Log a pre-condition message to the debug log
*/
static NS_COM void PreCondition(const char* aStr, const char* aExpr,
const char* aFile, PRIntn aLine);
/**
* Log a post-condition message to the debug log
*/
static NS_COM void PostCondition(const char* aStr, const char* aExpr,
const char* aFile, PRIntn aLine);
/**
* Log an assertion message to the debug log
*/
static NS_COM void Assertion(const char* aStr, const char* aExpr,
const char* aFile, PRIntn aLine);
/**
* Log a not-yet-implemented message to the debug log
*/
static NS_COM void NotYetImplemented(const char* aMessage,
const char* aFile, PRIntn aLine);
/**
* Log a not-reached message to the debug log
*/
static NS_COM void NotReached(const char* aMessage,
const char* aFile, PRIntn aLine);
/**
* Log an error message to the debug log. This call returns.
*/
static NS_COM void Error(const char* aMessage,
const char* aFile, PRIntn aLine);
/**
* Log a warning message to the debug log.
*/
static NS_COM void Warning(const char* aMessage,
const char* aFile, PRIntn aLine);
};
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#ifdef DEBUG
/**
* Abort the execution of the program if the expresion evaluates to
* false.
*
* There is no status value returned from the macro.
*
* Note that the non-debug version of this macro does <b>not</b>
* evaluate the expression argument. Hence side effect statements
* as arguments to the macro will yield improper execution in a
* non-debug build. For example:
*
* NS_ABORT_IF_FALSE(0 == foo++, "yikes foo should be zero");
*
* Note also that the non-debug version of this macro does <b>not</b>
* evaluate the message argument.
*/
#define NS_ABORT_IF_FALSE(_expr,_msg) \
PR_BEGIN_MACRO \
if (!(_expr)) { \
nsDebug::AbortIfFalse(_msg, #_expr, __FILE__, __LINE__); \
} \
PR_END_MACRO
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/**
* Warn if a given condition is false.
*
* Program execution continues past the usage of this macro.
*
* The macro returns a status value that can be used in an "if"
* statement. For example:
*
* if (NS_WARN_IF_FALSE(aPtr, "null pointer")) {
* return NS_ERROR_NULL_POINTER;
* }
*
* Note that the non-debug version of this macro <b>does</b> evaluate
* the expression as this macro continues to return a boolean
* value. Therefore side effect expressions will work
* correctly. However, they are still "poor form" so don't do it!
*
* Note also that the non-debug version of this macro does <b>not</b>
* evaluate the message argument.
*/
#define NS_WARN_IF_FALSE(_e,_msg) \
(!(_e) ? nsDebug::WarnIfFalse(_msg, #_e, __FILE__, __LINE__) : PR_FALSE)
// Note: Macros below this line are the old ones; please start using
// the new ones. The old ones will be removed eventually!
//////////////////////////////////////////////////////////////////////
/**
* Test a precondition for truth. If the expression is not true then
* trigger a program failure.
*/
#define NS_PRECONDITION(expr,str) \
if (!(expr)) \
nsDebug::PreCondition(str, #expr, __FILE__, __LINE__)
/**
* Test an assertion for truth. If the expression is not true then
* trigger a program failure.
*/
#define NS_ASSERTION(expr,str) \
if (!(expr)) \
nsDebug::Assertion(str, #expr, __FILE__, __LINE__)
/**
* Test an assertion for truth. If the expression is not true then
* trigger a program failure. The expression will still be
* executed in release mode.
*/
#define NS_VERIFY(expr,str) \
if (!(expr)) \
nsDebug::Assertion(str, #expr, __FILE__, __LINE__)
/**
* Test a post-condition for truth. If the expression is not true then
* trigger a program failure.
*/
#define NS_POSTCONDITION(expr,str) \
if (!(expr)) \
nsDebug::PostCondition(str, #expr, __FILE__, __LINE__)
/**
* This macros triggers a program failure if executed. It indicates that
* an attempt was made to execute some unimplimented functionality.
*/
#define NS_NOTYETIMPLEMENTED(str) \
nsDebug::NotYetImplemented(str, __FILE__, __LINE__)
/**
* This macros triggers a program failure if executed. It indicates that
* an attempt was made to execute some unimplimented functionality.
*/
#define NS_NOTREACHED(str) \
nsDebug::NotReached(str, __FILE__, __LINE__)
/**
* Log an error message.
*/
#define NS_ERROR(str) \
nsDebug::Error(str, __FILE__, __LINE__)
/**
* Log a warning message.
*/
#define NS_WARNING(str) \
nsDebug::Warning(str, __FILE__, __LINE__)
/**
* Trigger an abort
*/
#define NS_ABORT() \
nsDebug::Abort(__FILE__, __LINE__)
/**
* Cause a break
*/
#define NS_BREAK() \
nsDebug::Break(__FILE__, __LINE__)
#else /* NS_DEBUG */
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/**
* The non-debug version of this macro does not evaluate the
* expression or the message arguments to the macro.
*/
#define NS_ABORT_IF_FALSE(_expr,_msg) {}
/**
* Note that the non-debug version of this macro <b>does</b> evaluate
* the expression as this macro continues to return a boolean
* value.
*
* The non-debug version of this macro does <b>not</b> evaluate the
* message argument.
*/
#define NS_WARN_IF_FALSE(_e,_msg) \
(!(_e) ? PR_TRUE : PR_FALSE)
#define NS_PRECONDITION(expr,str) {}
#define NS_ASSERTION(expr,str) {}
#define NS_VERIFY(expr,str) expr
#define NS_POSTCONDITION(expr,str) {}
#define NS_NOTYETIMPLEMENTED(str) {}
#define NS_NOTREACHED(str) {}
#define NS_ERROR(str) {}
#define NS_WARNING(str) {}
#define NS_ABORT() {}
#define NS_BREAK() {}
#endif /* ! NS_DEBUG */
#endif /* __cplusplus */
#endif /* nsDebug_h___ */