DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (5216dd412535)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182
/* -*- 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 Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
 *
 * 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 ***** */

/*
 * Generate CPU-specific bit-size and similar #defines.
 */
#include <stdio.h>
#include <stdlib.h>

#if defined(CROSS_COMPILE) && !defined(FORCE_BIG_ENDIAN) && !defined(FORCE_LITTLE_ENDIAN)
#include <prtypes.h>
#endif

/************************************************************************/

int main(int argc, char **argv)
{
    printf("#ifndef js_cpucfg___\n");
    printf("#define js_cpucfg___\n\n");

    printf("/* AUTOMATICALLY GENERATED - DO NOT EDIT */\n\n");

#ifdef CROSS_COMPILE
#if defined(__APPLE__) && !defined(FORCE_BIG_ENDIAN) && !defined(FORCE_LITTLE_ENDIAN)
    /*
     * Darwin NSPR uses the same MDCPUCFG (_darwin.cfg) for multiple
     * processors, and determines which processor to configure for based
     * on compiler predefined macros.  We do the same thing here.
     */
    printf("#ifdef __LITTLE_ENDIAN__\n");
    printf("#define IS_LITTLE_ENDIAN 1\n");
    printf("#undef  IS_BIG_ENDIAN\n");
    printf("#else\n");
    printf("#undef  IS_LITTLE_ENDIAN\n");
    printf("#define IS_BIG_ENDIAN 1\n");
    printf("#endif\n\n");
#elif defined(IS_LITTLE_ENDIAN) || defined(FORCE_LITTLE_ENDIAN)
    printf("#define IS_LITTLE_ENDIAN 1\n");
    printf("#undef  IS_BIG_ENDIAN\n\n");
#elif defined(IS_BIG_ENDIAN) || defined(FORCE_BIG_ENDIAN)
    printf("#undef  IS_LITTLE_ENDIAN\n");
    printf("#define IS_BIG_ENDIAN 1\n\n");
#else
#error "Endianess not defined."
#endif

#else

    /*
     * We don't handle PDP-endian or similar orders: if a short is big-endian,
     * so must int and long be big-endian for us to generate the IS_BIG_ENDIAN
     * #define and the IS_LITTLE_ENDIAN #undef.
     */
    {
        int big_endian = 0, little_endian = 0, ntests = 0;

        if (sizeof(short) == 2) {
            /* force |volatile| here to get rid of any compiler optimisations
             * (var in register etc.) which may be appiled to |auto| vars -
             * even those in |union|s...
             * (|static| is used to get the same functionality for compilers
             * which do not honor |volatile|...).
             */
            volatile static union {
                short i;
                char c[2];
            } u;

            u.i = 0x0102;
            big_endian += (u.c[0] == 0x01 && u.c[1] == 0x02);
            little_endian += (u.c[0] == 0x02 && u.c[1] == 0x01);
            ntests++;
        }

        if (sizeof(int) == 4) {
            /* force |volatile| here ... */
            volatile static union {
                int i;
                char c[4];
            } u;

            u.i = 0x01020304;
            big_endian += (u.c[0] == 0x01 && u.c[1] == 0x02 &&
                           u.c[2] == 0x03 && u.c[3] == 0x04);
            little_endian += (u.c[0] == 0x04 && u.c[1] == 0x03 &&
                              u.c[2] == 0x02 && u.c[3] == 0x01);
            ntests++;
        }

        if (sizeof(long) == 8) {
            /* force |volatile| here ... */
            volatile static union {
                long i;
                char c[8];
            } u;

            /*
             * Write this as portably as possible: avoid 0x0102030405060708L
             * and <<= 32.
             */
            u.i = 0x01020304;
            u.i <<= 16, u.i <<= 16;
            u.i |= 0x05060708;
            big_endian += (u.c[0] == 0x01 && u.c[1] == 0x02 &&
                           u.c[2] == 0x03 && u.c[3] == 0x04 &&
                           u.c[4] == 0x05 && u.c[5] == 0x06 &&
                           u.c[6] == 0x07 && u.c[7] == 0x08);
            little_endian += (u.c[0] == 0x08 && u.c[1] == 0x07 &&
                              u.c[2] == 0x06 && u.c[3] == 0x05 &&
                              u.c[4] == 0x04 && u.c[5] == 0x03 &&
                              u.c[6] == 0x02 && u.c[7] == 0x01);
            ntests++;
        }

        if (big_endian && big_endian == ntests) {
            printf("#undef  IS_LITTLE_ENDIAN\n");
            printf("#define IS_BIG_ENDIAN 1\n\n");
        } else if (little_endian && little_endian == ntests) {
            printf("#define IS_LITTLE_ENDIAN 1\n");
            printf("#undef  IS_BIG_ENDIAN\n\n");
        } else {
            fprintf(stderr, "%s: unknown byte order"
                    "(big_endian=%d, little_endian=%d, ntests=%d)!\n",
                    argv[0], big_endian, little_endian, ntests);
            return EXIT_FAILURE;
        }
    }

#endif /* CROSS_COMPILE */

    // PA-RISC is the only platform we try to support on which the stack
    // grows towards higher addresses. Trying to detect it here has
    // historically led to portability problems, which aren't worth it
    // given the near consensus on stack growth direction.
    printf("#ifdef __hppa\n"
           "# define JS_STACK_GROWTH_DIRECTION (1)\n"
           "#else\n"
           "# define JS_STACK_GROWTH_DIRECTION (-1)\n"
           "#endif\n");

    printf("#endif /* js_cpucfg___ */\n");

    return EXIT_SUCCESS;
}