зеркало из https://github.com/mozilla/gecko-dev.git
266 строки
6.4 KiB
C
266 строки
6.4 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h>
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#if defined(__sun)
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#ifndef SOLARIS
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error - SOLARIS is not defined
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#endif
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#endif
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#if defined(__hpux)
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#ifndef HPUX
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error - HPUX is not defined
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#endif
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#endif
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#if defined(__alpha)
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#if !(defined(_WIN32)) && !(defined(__linux)) && !(defined(__FreeBSD__))
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error - None of _WIN32, __linux, or __FreeBSD__ is defined
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#endif
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#endif
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#if defined(_IBMR2)
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#ifndef AIX
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error - AIX is not defined
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#endif
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#endif
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#if defined(linux)
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#ifndef LINUX
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error - LINUX is not defined
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#endif
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#endif
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#if defined(bsdi)
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#ifndef BSDI
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error - BSDI is not defined
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#endif
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#endif
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#if defined(M_UNIX)
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#ifndef SCO
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error - SCO is not defined
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#endif
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#endif
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#if !defined(M_UNIX) && defined(_USLC_)
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#ifndef UNIXWARE
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error - UNIXWARE is not defined
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#endif
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#endif
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#if defined(__APPLE__)
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#ifndef DARWIN
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error - DARWIN is not defined
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#endif
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#endif
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/************************************************************************/
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/* Generate cpucfg.h */
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#ifdef XP_PC
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#ifdef WIN32
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#define INT64 _PRInt64
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#else
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#define INT64 long
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#endif
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#else
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#if defined(HPUX) || defined(SCO) || defined(UNIXWARE)
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#define INT64 long
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#else
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#define INT64 long long
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#endif
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#endif
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struct align_short {
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char c;
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short a;
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};
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struct align_int {
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char c;
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int a;
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};
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struct align_long {
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char c;
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long a;
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};
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struct align_PRInt64 {
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char c;
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INT64 a;
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};
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struct align_fakelonglong {
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char c;
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struct {
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long hi, lo;
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} a;
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};
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struct align_float {
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char c;
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float a;
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};
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struct align_double {
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char c;
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double a;
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};
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struct align_pointer {
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char c;
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void *a;
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};
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#define ALIGN_OF(type) \
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(((char*)&(((struct align_##type *)0)->a)) - ((char*)0))
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int bpb;
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/* Used if shell doesn't support redirection. By default, assume it does. */
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FILE *stream;
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static int Log2(int n)
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{
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int log2 = 0;
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if (n & (n-1)) {
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log2++;
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}
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if (n >> 16) {
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log2 += 16, n >>= 16;
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}
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if (n >> 8) {
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log2 += 8, n >>= 8;
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}
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if (n >> 4) {
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log2 += 4, n >>= 4;
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}
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if (n >> 2) {
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log2 += 2, n >>= 2;
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}
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if (n >> 1) {
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log2++;
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}
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return log2;
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}
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/* We assume that int's are 32 bits */
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static void do64(void)
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{
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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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if (u.c[0] == 0x01) {
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fprintf(stream, "#undef IS_LITTLE_ENDIAN\n");
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fprintf(stream, "#define IS_BIG_ENDIAN 1\n\n");
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} else {
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fprintf(stream, "#define IS_LITTLE_ENDIAN 1\n");
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fprintf(stream, "#undef IS_BIG_ENDIAN\n\n");
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}
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}
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static void do32(void)
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{
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union {
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long i;
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char c[4];
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} u;
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u.i = 0x01020304;
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if (u.c[0] == 0x01) {
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fprintf(stream, "#undef IS_LITTLE_ENDIAN\n");
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fprintf(stream, "#define IS_BIG_ENDIAN 1\n\n");
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} else {
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fprintf(stream, "#define IS_LITTLE_ENDIAN 1\n");
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fprintf(stream, "#undef IS_BIG_ENDIAN\n\n");
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}
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}
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/*
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** Concievably this could actually be used; but there is lots of code out
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** there with and's and shift's in it that assumes a byte is 8 bits, so
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** forget about porting THIS code to those non 8 bit byte machines.
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*/
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static void BitsPerByte(void)
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{
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bpb = 8;
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}
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int main(int argc, char **argv)
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{
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BitsPerByte();
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/* If we got a command line argument, try to use it as the stream. */
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++argv;
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if(*argv) {
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if(!(stream = fopen ( *argv, "wt" ))) {
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fprintf(stderr, "Could not write to output file %s.\n", *argv);
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return 1;
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}
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} else {
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stream = stdout;
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}
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fprintf(stream, "#ifndef nspr_cpucfg___\n");
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fprintf(stream, "#define nspr_cpucfg___\n\n");
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fprintf(stream, "/* AUTOMATICALLY GENERATED - DO NOT EDIT */\n\n");
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if (sizeof(long) == 8) {
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do64();
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} else {
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do32();
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}
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fprintf(stream, "#define PR_BYTES_PER_BYTE %d\n", sizeof(char));
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fprintf(stream, "#define PR_BYTES_PER_SHORT %d\n", sizeof(short));
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fprintf(stream, "#define PR_BYTES_PER_INT %d\n", sizeof(int));
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fprintf(stream, "#define PR_BYTES_PER_INT64 %d\n", 8);
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fprintf(stream, "#define PR_BYTES_PER_LONG %d\n", sizeof(long));
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fprintf(stream, "#define PR_BYTES_PER_FLOAT %d\n", sizeof(float));
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fprintf(stream, "#define PR_BYTES_PER_DOUBLE %d\n\n", sizeof(double));
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fprintf(stream, "#define PR_BITS_PER_BYTE %d\n", bpb);
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fprintf(stream, "#define PR_BITS_PER_SHORT %d\n", bpb * sizeof(short));
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fprintf(stream, "#define PR_BITS_PER_INT %d\n", bpb * sizeof(int));
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fprintf(stream, "#define PR_BITS_PER_INT64 %d\n", bpb * 8);
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fprintf(stream, "#define PR_BITS_PER_LONG %d\n", bpb * sizeof(long));
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fprintf(stream, "#define PR_BITS_PER_FLOAT %d\n", bpb * sizeof(float));
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fprintf(stream, "#define PR_BITS_PER_DOUBLE %d\n\n",
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bpb * sizeof(double));
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fprintf(stream, "#define PR_BITS_PER_BYTE_LOG2 %d\n", Log2(bpb));
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fprintf(stream, "#define PR_BITS_PER_SHORT_LOG2 %d\n",
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Log2(bpb * sizeof(short)));
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fprintf(stream, "#define PR_BITS_PER_INT_LOG2 %d\n",
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Log2(bpb * sizeof(int)));
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fprintf(stream, "#define PR_BITS_PER_INT64_LOG2 %d\n", 6);
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fprintf(stream, "#define PR_BITS_PER_LONG_LOG2 %d\n",
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Log2(bpb * sizeof(long)));
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fprintf(stream, "#define PR_BITS_PER_FLOAT_LOG2 %d\n",
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Log2(bpb * sizeof(float)));
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fprintf(stream, "#define PR_BITS_PER_DOUBLE_LOG2 %d\n\n",
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Log2(bpb * sizeof(double)));
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fprintf(stream, "#define PR_ALIGN_OF_SHORT %d\n", ALIGN_OF(short));
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fprintf(stream, "#define PR_ALIGN_OF_INT %d\n", ALIGN_OF(int));
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fprintf(stream, "#define PR_ALIGN_OF_LONG %d\n", ALIGN_OF(long));
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if (sizeof(INT64) < 8) {
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/* this machine doesn't actually support PRInt64's */
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fprintf(stream, "#define PR_ALIGN_OF_INT64 %d\n",
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ALIGN_OF(fakelonglong));
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} else {
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fprintf(stream, "#define PR_ALIGN_OF_INT64 %d\n", ALIGN_OF(PRInt64));
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}
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fprintf(stream, "#define PR_ALIGN_OF_FLOAT %d\n", ALIGN_OF(float));
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fprintf(stream, "#define PR_ALIGN_OF_DOUBLE %d\n", ALIGN_OF(double));
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fprintf(stream, "#define PR_ALIGN_OF_POINTER %d\n\n", ALIGN_OF(pointer));
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fprintf(stream, "#endif /* nspr_cpucfg___ */\n");
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fclose(stream);
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return 0;
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}
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