mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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195 lines
6.5 KiB
C++
195 lines
6.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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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 Communicator client code, released
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* March 31, 1998.
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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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* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
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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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/*
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* Generate CPU-specific bit-size and similar #defines.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef CROSS_COMPILE
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#include <prtypes.h>
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#endif
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/************************************************************************/
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#ifdef __GNUC__
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#define NS_NEVER_INLINE __attribute__((noinline))
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#else
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#define NS_NEVER_INLINE
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#endif
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#ifdef __SUNPRO_C
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static int StackGrowthDirection(int *dummy1addr);
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#pragma no_inline(StackGrowthDirection)
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#endif
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static int NS_NEVER_INLINE StackGrowthDirection(int *dummy1addr)
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{
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int dummy2;
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return (&dummy2 < dummy1addr) ? -1 : 1;
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}
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int main(int argc, char **argv)
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{
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int dummy1;
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printf("#ifndef js_cpucfg___\n");
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printf("#define js_cpucfg___\n\n");
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printf("/* AUTOMATICALLY GENERATED - DO NOT EDIT */\n\n");
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#ifdef CROSS_COMPILE
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#if defined(__APPLE__)
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/*
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* Darwin NSPR uses the same MDCPUCFG (_darwin.cfg) for multiple
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* processors, and determines which processor to configure for based
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* on compiler predefined macros. We do the same thing here.
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*/
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printf("#ifdef __LITTLE_ENDIAN__\n");
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printf("#define IS_LITTLE_ENDIAN 1\n");
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printf("#undef IS_BIG_ENDIAN\n");
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printf("#else\n");
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printf("#undef IS_LITTLE_ENDIAN\n");
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printf("#define IS_BIG_ENDIAN 1\n");
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printf("#endif\n\n");
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#elif defined(IS_LITTLE_ENDIAN)
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printf("#define IS_LITTLE_ENDIAN 1\n");
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printf("#undef IS_BIG_ENDIAN\n\n");
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#elif defined(IS_BIG_ENDIAN)
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printf("#undef IS_LITTLE_ENDIAN\n");
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printf("#define IS_BIG_ENDIAN 1\n\n");
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#else
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#error "Endianess not defined."
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#endif
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#else
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/*
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* We don't handle PDP-endian or similar orders: if a short is big-endian,
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* so must int and long be big-endian for us to generate the IS_BIG_ENDIAN
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* #define and the IS_LITTLE_ENDIAN #undef.
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*/
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{
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int big_endian = 0, little_endian = 0, ntests = 0;
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if (sizeof(short) == 2) {
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/* force |volatile| here to get rid of any compiler optimisations
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* (var in register etc.) which may be appiled to |auto| vars -
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* even those in |union|s...
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* (|static| is used to get the same functionality for compilers
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* which do not honor |volatile|...).
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*/
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volatile static union {
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short i;
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char c[2];
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} u;
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u.i = 0x0102;
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big_endian += (u.c[0] == 0x01 && u.c[1] == 0x02);
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little_endian += (u.c[0] == 0x02 && u.c[1] == 0x01);
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ntests++;
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}
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if (sizeof(int) == 4) {
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/* force |volatile| here ... */
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volatile static union {
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int i;
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char c[4];
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} u;
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u.i = 0x01020304;
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big_endian += (u.c[0] == 0x01 && u.c[1] == 0x02 &&
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u.c[2] == 0x03 && u.c[3] == 0x04);
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little_endian += (u.c[0] == 0x04 && u.c[1] == 0x03 &&
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u.c[2] == 0x02 && u.c[3] == 0x01);
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ntests++;
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}
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if (sizeof(long) == 8) {
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/* force |volatile| here ... */
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volatile static union {
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long i;
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char c[8];
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} u;
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/*
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* Write this as portably as possible: avoid 0x0102030405060708L
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* and <<= 32.
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*/
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u.i = 0x01020304;
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u.i <<= 16, u.i <<= 16;
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u.i |= 0x05060708;
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big_endian += (u.c[0] == 0x01 && u.c[1] == 0x02 &&
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u.c[2] == 0x03 && u.c[3] == 0x04 &&
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u.c[4] == 0x05 && u.c[5] == 0x06 &&
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u.c[6] == 0x07 && u.c[7] == 0x08);
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little_endian += (u.c[0] == 0x08 && u.c[1] == 0x07 &&
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u.c[2] == 0x06 && u.c[3] == 0x05 &&
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u.c[4] == 0x04 && u.c[5] == 0x03 &&
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u.c[6] == 0x02 && u.c[7] == 0x01);
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ntests++;
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}
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if (big_endian && big_endian == ntests) {
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printf("#undef IS_LITTLE_ENDIAN\n");
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printf("#define IS_BIG_ENDIAN 1\n\n");
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} else if (little_endian && little_endian == ntests) {
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printf("#define IS_LITTLE_ENDIAN 1\n");
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printf("#undef IS_BIG_ENDIAN\n\n");
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} else {
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fprintf(stderr, "%s: unknown byte order"
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"(big_endian=%d, little_endian=%d, ntests=%d)!\n",
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argv[0], big_endian, little_endian, ntests);
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return EXIT_FAILURE;
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}
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}
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#endif /* CROSS_COMPILE */
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printf("#define JS_STACK_GROWTH_DIRECTION (%d)\n", StackGrowthDirection(&dummy1));
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printf("#endif /* js_cpucfg___ */\n");
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return EXIT_SUCCESS;
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}
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