зеркало из https://github.com/mozilla/gecko-dev.git
470 строки
14 KiB
C
470 строки
14 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nscore_h___
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#define nscore_h___
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/**
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* Make sure that we have the proper platform specific
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* c++ definitions needed by nscore.h
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*/
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#ifndef _XPCOM_CONFIG_H_
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#include "xpcom-config.h"
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#endif
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/**
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* Incorporate the core NSPR data types which XPCOM uses.
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*/
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#include "prtypes.h"
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/* Core XPCOM declarations. */
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/**
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* Macros defining the target platform...
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*/
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#ifdef _WIN32
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#define NS_WIN32 1
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#elif defined(__unix)
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#define NS_UNIX 1
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#elif defined(XP_OS2)
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#define NS_OS2 1
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#endif
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/*----------------------------------------------------------------------*/
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/* Import/export defines */
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/**
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* Using the visibility("hidden") attribute allows the compiler to use
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* PC-relative addressing to call this function. If a function does not
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* access any global data, and does not call any methods which are not either
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* file-local or hidden, then on ELF systems we avoid loading the address of
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* the PLT into a register at the start of the function, which reduces code
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* size and frees up a register for general use.
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*
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* As a general rule, this should be used for any non-exported symbol
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* (including virtual method implementations). NS_IMETHOD uses this by
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* default; if you need to have your NS_IMETHOD functions exported, you can
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* wrap your class as follows:
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*
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* #undef IMETHOD_VISIBILITY
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* #define IMETHOD_VISIBILITY NS_VISIBILITY_DEFAULT
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*
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* class Foo {
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* ...
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* };
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*
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* #undef IMETHOD_VISIBILITY
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* #define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
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*
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* Don't forget to change the visibility back to hidden before the end
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* of a header!
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*
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* Other examples:
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*
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* NS_HIDDEN_(int) someMethod();
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* SomeCtor() NS_HIDDEN;
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*/
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#ifdef HAVE_VISIBILITY_HIDDEN_ATTRIBUTE
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#define NS_VISIBILITY_HIDDEN __attribute__ ((visibility ("hidden")))
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#else
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#define NS_VISIBILITY_HIDDEN
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#endif
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#if defined(HAVE_VISIBILITY_ATTRIBUTE)
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#define NS_VISIBILITY_DEFAULT __attribute__ ((visibility ("default")))
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#else
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#define NS_VISIBILITY_DEFAULT
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#endif
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#define NS_HIDDEN_(type) NS_VISIBILITY_HIDDEN type
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#define NS_EXTERNAL_VIS_(type) NS_VISIBILITY_DEFAULT type
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#define NS_HIDDEN NS_VISIBILITY_HIDDEN
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#define NS_EXTERNAL_VIS NS_VISIBILITY_DEFAULT
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#undef IMETHOD_VISIBILITY
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#define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
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/**
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* Mark a function as using a potentially non-standard function calling
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* convention. This can be used on functions that are called very
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* frequently, to reduce the overhead of the function call. It is still worth
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* using the macro for C++ functions which take no parameters since it allows
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* passing |this| in a register.
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*
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* - Do not use this on any scriptable interface method since xptcall won't be
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* aware of the different calling convention.
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* - This must appear on the declaration, not the definition.
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* - Adding this to a public function _will_ break binary compatibility.
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* - This may be used on virtual functions but you must ensure it is applied
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* to all implementations - the compiler will _not_ warn but it will crash.
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* - This has no effect for inline functions or functions which take a
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* variable number of arguments.
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* - __fastcall on windows should not be applied to class
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* constructors/destructors - use the NS_CONSTRUCTOR_FASTCALL macro for
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* constructors/destructors.
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*
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* Examples: int NS_FASTCALL func1(char *foo);
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* NS_HIDDEN_(int) NS_FASTCALL func2(char *foo);
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*/
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#if defined(__i386__) && defined(__GNUC__) && (__GNUC__ >= 3) && !defined(XP_OS2)
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#define NS_FASTCALL __attribute__ ((regparm (3), stdcall))
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#define NS_CONSTRUCTOR_FASTCALL __attribute__ ((regparm (3), stdcall))
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#elif defined(XP_WIN)
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#define NS_FASTCALL __fastcall
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#define NS_CONSTRUCTOR_FASTCALL
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#else
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#define NS_FASTCALL
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#define NS_CONSTRUCTOR_FASTCALL
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#endif
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/*
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* NS_DEFCALL undoes the effect of a global regparm/stdcall setting
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* so that xptcall works correctly.
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*/
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#if defined(__i386__) && defined(__GNUC__) && (__GNUC__ >= 3) && !defined(XP_OS2)
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#define NS_DEFCALL __attribute__ ((regparm (0), cdecl))
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#else
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#define NS_DEFCALL
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#endif
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#ifdef NS_WIN32
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#define NS_IMPORT __declspec(dllimport)
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#define NS_IMPORT_(type) __declspec(dllimport) type __stdcall
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#define NS_EXPORT __declspec(dllexport)
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#define NS_EXPORT_(type) __declspec(dllexport) type __stdcall
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#define NS_IMETHOD_(type) virtual type __stdcall
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#define NS_IMETHODIMP_(type) type __stdcall
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#define NS_METHOD_(type) type __stdcall
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#define NS_CALLBACK_(_type, _name) _type (__stdcall * _name)
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#define NS_STDCALL __stdcall
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#define NS_FROZENCALL __cdecl
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/*
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These are needed to mark static members in exported classes, due to
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gcc bug XXX insert bug# here.
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*/
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#define NS_EXPORT_STATIC_MEMBER_(type) type
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#define NS_IMPORT_STATIC_MEMBER_(type) type
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#elif defined(XP_OS2) && defined(__declspec)
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#define NS_IMPORT __declspec(dllimport)
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#define NS_IMPORT_(type) type __declspec(dllimport)
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#define NS_EXPORT __declspec(dllexport)
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#define NS_EXPORT_(type) type __declspec(dllexport)
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#define NS_IMETHOD_(type) virtual type
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#define NS_IMETHODIMP_(type) type
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#define NS_METHOD_(type) type
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#define NS_CALLBACK_(_type, _name) _type (* _name)
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#define NS_STDCALL
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#define NS_FROZENCALL
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#define NS_EXPORT_STATIC_MEMBER_(type) NS_EXTERNAL_VIS_(type)
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#define NS_IMPORT_STATIC_MEMBER_(type) NS_EXTERNAL_VIS_(type)
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#else
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#define NS_IMPORT NS_EXTERNAL_VIS
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#define NS_IMPORT_(type) NS_EXTERNAL_VIS_(type)
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#define NS_EXPORT NS_EXTERNAL_VIS
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#define NS_EXPORT_(type) NS_EXTERNAL_VIS_(type)
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#define NS_IMETHOD_(type) virtual IMETHOD_VISIBILITY type NS_DEFCALL
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#define NS_IMETHODIMP_(type) type
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#define NS_METHOD_(type) type
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#define NS_CALLBACK_(_type, _name) _type (* _name)
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#define NS_STDCALL
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#define NS_FROZENCALL
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#define NS_EXPORT_STATIC_MEMBER_(type) NS_EXTERNAL_VIS_(type)
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#define NS_IMPORT_STATIC_MEMBER_(type) NS_EXTERNAL_VIS_(type)
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#endif
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/**
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* Macro for creating typedefs for pointer-to-member types which are
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* declared with stdcall. It is important to use this for any type which is
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* declared as stdcall (i.e. NS_IMETHOD). For example, instead of writing:
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*
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* typedef nsresult (nsIFoo::*someType)(nsISupports* arg);
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*
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* you should write:
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*
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* typedef
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* NS_STDCALL_FUNCPROTO(nsresult, someType, nsIFoo, typeFunc, (nsISupports*));
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*
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* where nsIFoo::typeFunc is any method declared as
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* NS_IMETHOD typeFunc(nsISupports*);
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*
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* XXX this can be simplified to always use the non-typeof implementation
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* when http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11893 is fixed.
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*/
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#ifdef __GNUC__
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#define NS_STDCALL_FUNCPROTO(ret, name, class, func, args) \
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typeof(&class::func) name
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#else
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#define NS_STDCALL_FUNCPROTO(ret, name, class, func, args) \
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ret (NS_STDCALL class::*name) args
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#endif
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/**
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* Generic API modifiers which return the standard XPCOM nsresult type
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*/
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#define NS_IMETHOD NS_IMETHOD_(nsresult)
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#define NS_IMETHODIMP NS_IMETHODIMP_(nsresult)
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#define NS_METHOD NS_METHOD_(nsresult)
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#define NS_CALLBACK(_name) NS_CALLBACK_(nsresult, _name)
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/**
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* Import/Export macros for XPCOM APIs
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*/
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#ifdef __cplusplus
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#define NS_EXTERN_C extern "C"
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#else
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#define NS_EXTERN_C
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#endif
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#define EXPORT_XPCOM_API(type) NS_EXTERN_C NS_EXPORT type NS_FROZENCALL
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#define IMPORT_XPCOM_API(type) NS_EXTERN_C NS_IMPORT type NS_FROZENCALL
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#define GLUE_XPCOM_API(type) NS_EXTERN_C NS_HIDDEN_(type) NS_FROZENCALL
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#ifdef _IMPL_NS_COM
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#define XPCOM_API(type) EXPORT_XPCOM_API(type)
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#elif defined(XPCOM_GLUE)
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#define XPCOM_API(type) GLUE_XPCOM_API(type)
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#else
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#define XPCOM_API(type) IMPORT_XPCOM_API(type)
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#endif
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#ifdef MOZ_ENABLE_LIBXUL
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#define NS_COM
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#elif defined(_IMPL_NS_COM)
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#define NS_COM NS_EXPORT
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#elif defined(XPCOM_GLUE)
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#define NS_COM
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#else
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#define NS_COM NS_IMPORT
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#endif
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#ifdef MOZILLA_INTERNAL_API
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# define NS_COM_GLUE NS_COM
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/*
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The frozen string API has different definitions of nsAC?String
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classes than the internal API. On systems that explicitly declare
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dllexport symbols this is not a problem, but on ELF systems
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internal symbols can accidentally "shine through"; we rename the
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internal classes to avoid symbol conflicts.
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*/
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# define nsAString nsAString_internal
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# define nsACString nsACString_internal
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#else
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# ifdef HAVE_VISIBILITY_ATTRIBUTE
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# define NS_COM_GLUE NS_VISIBILITY_HIDDEN
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# else
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# define NS_COM_GLUE
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# endif
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#endif
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/**
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* NS_NO_VTABLE is emitted by xpidl in interface declarations whenever
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* xpidl can determine that the interface can't contain a constructor.
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* This results in some space savings and possible runtime savings -
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* see bug 49416. We undefine it first, as xpidl-generated headers
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* define it for IDL uses that don't include this file.
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*/
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#ifdef NS_NO_VTABLE
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#undef NS_NO_VTABLE
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#endif
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#if defined(_MSC_VER) && _MSC_VER >= 1100
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#define NS_NO_VTABLE __declspec(novtable)
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#else
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#define NS_NO_VTABLE
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#endif
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/**
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* Generic XPCOM result data type
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*/
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typedef PRUint32 nsresult;
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/**
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* Reference count values
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*
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* This is the return type for AddRef() and Release() in nsISupports.
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* IUnknown of COM returns an unsigned long from equivalent functions.
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* The following ifdef exists to maintain binary compatibility with
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* IUnknown.
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*/
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#if defined(XP_WIN) && PR_BYTES_PER_LONG == 4
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typedef unsigned long nsrefcnt;
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#else
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typedef PRUint32 nsrefcnt;
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#endif
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/**
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* The preferred symbol for null.
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*/
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#define nsnull 0
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#include "nsError.h"
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/* ------------------------------------------------------------------------ */
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/* Casting macros for hiding C++ features from older compilers */
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/*
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All our compiler support template specialization, but not all support the
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|template <>| notation. The compiler that don't understand this notation
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just omit it for specialization.
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Need to add an autoconf test for this.
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*/
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/* under Metrowerks (Mac), we don't have autoconf yet */
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#ifdef __MWERKS__
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#define HAVE_CPP_PARTIAL_SPECIALIZATION
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#define HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX
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#define HAVE_CPP_ACCESS_CHANGING_USING
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#define HAVE_CPP_AMBIGUITY_RESOLVING_USING
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#define HAVE_CPP_EXPLICIT
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#define HAVE_CPP_TYPENAME
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#define HAVE_CPP_BOOL
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#define HAVE_CPP_NAMESPACE_STD
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#define HAVE_CPP_UNAMBIGUOUS_STD_NOTEQUAL
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#define HAVE_CPP_2BYTE_WCHAR_T
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#endif
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/* under VC++ (Windows), we don't have autoconf yet */
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#if defined(_MSC_VER) && (_MSC_VER>=1100)
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/* VC++ 5.0 and greater implement template specialization, 4.2 is unknown */
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#define HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX
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#define HAVE_CPP_EXPLICIT
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#define HAVE_CPP_TYPENAME
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#define HAVE_CPP_ACCESS_CHANGING_USING
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#if (_MSC_VER==1100)
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/* VC++5.0 has an internal compiler error (sometimes) without this */
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#undef HAVE_CPP_ACCESS_CHANGING_USING
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#endif
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#define HAVE_CPP_NAMESPACE_STD
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#define HAVE_CPP_UNAMBIGUOUS_STD_NOTEQUAL
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#define HAVE_CPP_2BYTE_WCHAR_T
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#endif
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#ifndef __PRUNICHAR__
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#define __PRUNICHAR__
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/* For now, don't use wchar_t on Unix because it breaks the Netscape
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* commercial build. When this is fixed there will be no need for the
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* |NS_REINTERPRET_CAST| in nsLiteralString.h either.
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*/
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#if defined(HAVE_CPP_2BYTE_WCHAR_T) && defined(NS_WIN32)
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typedef wchar_t PRUnichar;
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#else
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typedef PRUint16 PRUnichar;
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#endif
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#endif
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/*
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If the compiler doesn't support |explicit|, we'll just make it go away, trusting
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that the builds under compilers that do have it will keep us on the straight and narrow.
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*/
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#ifndef HAVE_CPP_EXPLICIT
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#define explicit
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#endif
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#ifndef HAVE_CPP_TYPENAME
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#define typename
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#endif
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#ifdef HAVE_CPP_MODERN_SPECIALIZE_TEMPLATE_SYNTAX
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#define NS_SPECIALIZE_TEMPLATE template <>
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#else
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#define NS_SPECIALIZE_TEMPLATE
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#endif
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#define NS_STATIC_CAST(__type, __ptr) static_cast< __type >(__ptr)
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#define NS_CONST_CAST(__type, __ptr) const_cast< __type >(__ptr)
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#define NS_REINTERPRET_POINTER_CAST(__type, __ptr) reinterpret_cast< __type >(__ptr)
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#define NS_REINTERPRET_NONPOINTER_CAST(__type, __obj) reinterpret_cast< __type >(__obj)
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#define NS_REINTERPRET_CAST(__type, __expr) reinterpret_cast< __type >(__expr)
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/*
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* Use these macros to do 64bit safe pointer conversions.
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*/
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#define NS_PTR_TO_INT32(x) ((PRInt32) (PRWord) (x))
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#define NS_PTR_TO_UINT32(x) ((PRUint32) (PRWord) (x))
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#define NS_INT32_TO_PTR(x) ((void *) (PRWord) (x))
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/*
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* Use NS_STRINGIFY to form a string literal from the value of a macro.
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*/
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#define NS_STRINGIFY_HELPER(x_) #x_
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#define NS_STRINGIFY(x_) NS_STRINGIFY_HELPER(x_)
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/*
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* These macros allow you to give a hint to the compiler about branch
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* probability so that it can better optimize. Use them like this:
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*
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* if (NS_LIKELY(v == 1)) {
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* ... expected code path ...
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* }
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*
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* if (NS_UNLIKELY(v == 0)) {
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* ... non-expected code path ...
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* }
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*
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*/
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#if defined(__GNUC__) && (__GNUC__ > 2)
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#define NS_LIKELY(x) (__builtin_expect((x), 1))
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#define NS_UNLIKELY(x) (__builtin_expect((x), 0))
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#else
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#define NS_LIKELY(x) (x)
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#define NS_UNLIKELY(x) (x)
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#endif
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#endif /* nscore_h___ */
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