diff options
Diffstat (limited to '')
-rw-r--r-- | src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptc_gcc_x86_unix.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptc_gcc_x86_unix.h b/src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptc_gcc_x86_unix.h new file mode 100644 index 00000000..707352aa --- /dev/null +++ b/src/libs/xpcom18a4/xpcom/reflect/xptcall/src/md/unix/xptc_gcc_x86_unix.h @@ -0,0 +1,92 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla 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/MPL/ + * + * 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 the Initial Developer are Copyright (C) 1999 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either of the GNU General Public License Version 2 or later (the "GPL"), + * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +/* Special include file for xptc*_gcc_x86_unix.cpp */ + +// +// this may improve the static function calls, but may not. +// + +// #define MOZ_USE_STDCALL + +#ifdef MOZ_USE_STDCALL +#define ATTRIBUTE_STDCALL __attribute__ ((__stdcall__)) +#else +#define ATTRIBUTE_STDCALL +#endif + +#ifdef MOZ_NEED_LEADING_UNDERSCORE +#define SYMBOL_UNDERSCORE "_" +#else +#define SYMBOL_UNDERSCORE +#endif + +/* + What are those keeper functions? + + The problem: gcc doesn't know that the assembler routines call + static functions so gcc may not emit the definition (i.e., the + code) for these functions. In gcc 3.1 and up + "__attribute__ ((used))" exists and solves the problem. + For older gcc versions it's not so easy. One could use the + -fkeep-inline-functions but that keeps a surprising number of + functions which bloats the compiled library. It seems otherwise + harmless, though. Alternatively, one could use + -fno-inline-functions which works right now but might cause a + slowdown under some circumstances. The problem with these methods + is that they do not automatically adapt to the compiler used. + + The best solution seems to be to create dummy functions that + reference the appropriate static functions. It's then necessary + to "use" these functions in a way that gcc will not optimize + away. The keeper functions use assembly code to confuse gcc. + + One drawback is that the keeper functions are externally visible + so they shouldn't do anything harmful. + + With the right linker, one could make the keeper functions local + so they wouldn't be visible. + */ + + +// gcc 3.1 and up +#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1) +#define ATTRIBUTE_USED __attribute__ ((__used__)) +#else +#define ATTRIBUTE_USED +#endif + |