зеркало из https://github.com/mozilla/gecko-dev.git
185 строки
6.2 KiB
C
185 строки
6.2 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef _XP_Assert_
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#define _XP_Assert_
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#include "xp_trace.h"
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/*include <stdlib.h>*/
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/*-----------------------------------------------------------------------------
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abort
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For debug builds...
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XP_ABORT(X), unlike abort(), takes a text string argument. It will print
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it out and then call abort (to drop you into your debugger).
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For release builds...
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XP_ABORT will call abort(). Whether you #define NDEBUG or not is up
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to you.
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-----------------------------------------------------------------------------*/
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#define XP_ABORT(MESSAGE) (XP_TRACE(MESSAGE),abort())
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/*-----------------------------------------------------------------------------
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XP_ASSERT is just like "assert" but calls XP_ABORT if it fails the test.
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I need this (on a Mac) because "assert" and "abort" are braindead,
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whereas my XP_Abort function will invoke the debugger. It could
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possibly have been easier to just #define assert to be something decent.
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-----------------------------------------------------------------------------*/
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#if defined (XP_UNIX)
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#if !defined(NO_UNIX_SKIP_ASSERTS)
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/* Turning UNIX_SKIP_ASSERTS on by default. */
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/* (Solaris 2.x) on Sol2.5, assert() does not work. Too bad... */
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/* Therefore, we print the line where assert happened instead. */
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/* Print out a \007 to sound the bell. -mcafee */
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#define XP_AssertAtLine() fprintf(stderr, "assert: line %d, file %s%c\n", __LINE__, __FILE__, 7)
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#ifdef DEBUG
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#define XP_ASSERT(X) ( (((X))!=0)? (void)0: (void)XP_AssertAtLine() )
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#else
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#define XP_ASSERT(X) (void)0
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#endif
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#else
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#include <assert.h>
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#define XP_ASSERT(X) assert(X) /* are we having fun yet? */
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#endif
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#elif defined (XP_WIN)
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#ifdef DEBUG
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/* LTNOTE: I got tired of seeing all asserts at FEGUI.CPP. This should
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* Fix the problem. I intentionally left out Win16 because strings are stuffed
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* into the datasegment we probably couldn't build.
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*/
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#ifdef WIN32
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XP_BEGIN_PROTOS
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extern void XP_AssertAtLine( char *pFileName, int iLine );
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XP_END_PROTOS
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#define XP_ASSERT(X) ( ((X)!=0)? (void)0: XP_AssertAtLine(__FILE__,__LINE__))
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#else /* win16 */
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#define XP_ASSERT(X) ( ((X)!=0)? (void)0: XP_Assert((X) != 0) )
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XP_BEGIN_PROTOS
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void XP_Assert(int);
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XP_END_PROTOS
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#endif
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#else
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#define XP_ASSERT(X) ((void) 0)
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#endif
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#elif defined (XP_OS2)
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#ifdef DEBUG
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#include <assert.h>
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#define XP_ASSERT(X) assert(X) /* IBM-DAK same as UNIX */
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#else
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#define XP_ASSERT(X)
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#endif
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#elif defined(XP_MAC)
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#ifdef DEBUG
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#ifdef __cplusplus
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#ifdef __MWERKS__
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/*
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** See the comment above: XP_ASSERT is supposed to abort!
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** The MacFE_Signal is actually not in the spirit of the creator of XP_Assert.
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** Also, the previous version was annoying (always seen in uapp.cp)
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** The Metrowerks Assert_ macro is much more helpful...
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*/
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#include <UException.h>
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#define XP_ASSERT(X) Assert_(X)
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#else
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extern "C" void debugstr(const char* s);
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#endif
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#else
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extern void debugstr(const char* s);
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#endif
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#ifndef XP_ASSERT
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/* The following is wrong... because it will cause
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the use of an XP_ASSERT within an if ... else ...
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construct to match incorrectly with the "last prior if" :-/
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XXX
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*/
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#define XP_ASSERT(X) if (!(X)) debugstr(#X)
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#endif
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#else
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#define XP_ASSERT(X)
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#endif
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#endif /* XP_MAC */
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/*-----------------------------------------------------------------------------
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assert variants
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XP_WARN_ASSERT if defined to nothing for release builds. This means
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that instead of
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#ifdef DEBUG
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assert (X);
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#endif
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you can just do
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XP_WARN_ASSERT(X);
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Of course when asserts fail that means something is going wrong and you
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*should* have normal code to deal with that.
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I frequently found myself writing code like this:
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#ifdef DEBUG
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assert (aPtr);
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#endif
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if (!aPtr)
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return error_something_has_gone_wrong;
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so I just combined them into a macro that can be used like this:
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if (XP_FAIL_ASSERT(aPtr))
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return; // or whatever else you do when things go wrong
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What this means is it will return if X *fails* the test. Essentially
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the XP_FAIL_ASSERT bit replaces the "!" in the if test.
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XP_OK_ASSERT is the opposite. If if you want to do something only if
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something is OK, then use it. For example:
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if (XP_OK_ASSERT(aPtr))
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aPtr->aField = 25;
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Use this if you are 99% sure that aPtr will be valid. If it ever is not,
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you'll drop into the debugger. For release builds, it turns into an
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if statement, so it's completely safe to execute.
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You can also do XP_VERIFY, which essentially will throw an assert if a
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condition fails in debug mode, but just do whatever at runtime. For
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example:
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XP_VERIFY(PR_LoadLibrary("foo") == 0);
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This will trigger an XP_ASSERT if the condition fails during debug, bug
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just run the PR_LoadLibrary in release. Kind of the same as XP_WARN_ASSERT,
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but the "verbiage" is a bit clearer (to me, anyway).
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-----------------------------------------------------------------------------*/
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#ifdef DEBUG
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# define XP_WARN_ASSERT(X) ( ((X)!=0)? (void)0: XP_ABORT((#X)) )
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# define XP_OK_ASSERT(X) (((X)!=0)? 1: (XP_ABORT((#X)),0))
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# define XP_FAIL_ASSERT(X) (((X)!=0)? 0: (XP_ABORT((#X)),1))
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# define XP_VERIFY(X) ( (X)? (void)0: XP_ASSERT(0) )
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#else
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# define XP_WARN_ASSERT(X) (void)((X)!=0)
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# define XP_OK_ASSERT(X) (((X)!=0)? 1: 0)
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# define XP_FAIL_ASSERT(X) (((X)!=0)? 0: 1)
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# define XP_VERIFY(X) ( (void)(X) )
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#endif
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#endif /* _XP_Assert_ */
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