jscpucfg.c
来自「一个基于alice开发的机器人」· C语言 代码 · 共 378 行
C
378 行
/* -*- 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>
#ifdef CROSS_COMPILE
#include <prtypes.h>
#define INT64 PRInt64
#else
#ifdef __MWERKS__
#define XP_MAC 1
#endif
/************************************************************************/
/* Generate cpucfg.h */
#ifdef XP_MAC
#include <Types.h>
#define INT64 UnsignedWide
#else
#if defined(XP_WIN) || defined(XP_OS2)
#ifdef WIN32
#if defined(__GNUC__)
#define INT64 long long
#else
#define INT64 _int64
#endif /* __GNUC__ */
#else
#define INT64 long
#endif
#else
#if defined(HPUX) || defined(__QNX__) || defined(_SCO_DS) || defined(UNIXWARE)
#define INT64 long
#else
#define INT64 long long
#endif
#endif
#endif
#endif /* CROSS_COMPILE */
typedef void *prword;
struct align_short {
char c;
short a;
};
struct align_int {
char c;
int a;
};
struct align_long {
char c;
long a;
};
struct align_int64 {
char c;
INT64 a;
};
struct align_fakelonglong {
char c;
struct {
long hi, lo;
} a;
};
struct align_float {
char c;
float a;
};
struct align_double {
char c;
double a;
};
struct align_pointer {
char c;
void *a;
};
struct align_prword {
char c;
prword a;
};
#define ALIGN_OF(type) \
(((char*)&(((struct align_##type *)0)->a)) - ((char*)0))
unsigned int bpb;
static int Log2(unsigned int n)
{
int log2 = 0;
if (n & (n-1))
log2++;
if (n >> 16)
log2 += 16, n >>= 16;
if (n >> 8)
log2 += 8, n >>= 8;
if (n >> 4)
log2 += 4, n >>= 4;
if (n >> 2)
log2 += 2, n >>= 2;
if (n >> 1)
log2++;
return log2;
}
/*
* Conceivably this could actually be used, but there is lots of code out
* there with ands and shifts in it that assumes a byte is exactly 8 bits,
* so forget about porting THIS code to all those non 8 bit byte machines.
*/
static void BitsPerByte(void)
{
bpb = 8;
}
static int StackGrowthDirection(int *dummy1addr)
{
int dummy2;
return (&dummy2 < dummy1addr) ? -1 : 1;
}
int main(int argc, char **argv)
{
int sizeof_char, sizeof_short, sizeof_int, sizeof_int64, sizeof_long,
sizeof_float, sizeof_double, sizeof_word, sizeof_dword;
int bits_per_int64_log2, align_of_short, align_of_int, align_of_long,
align_of_int64, align_of_float, align_of_double, align_of_pointer,
align_of_word;
int dummy1;
BitsPerByte();
printf("#ifndef js_cpucfg___\n");
printf("#define js_cpucfg___\n\n");
printf("/* AUTOMATICALLY GENERATED - DO NOT EDIT */\n\n");
#ifdef CROSS_COMPILE
#if defined(IS_LITTLE_ENDIAN)
printf("#define IS_LITTLE_ENDIAN 1\n");
printf("#undef IS_BIG_ENDIAN\n\n");
#elif defined(IS_BIG_ENDIAN)
printf("#undef IS_LITTLE_ENDIAN\n");
printf("#define IS_BIG_ENDIAN 1\n\n");
#else
#error "Endianess not defined."
#endif
sizeof_char = PR_BYTES_PER_BYTE;
sizeof_short = PR_BYTES_PER_SHORT;
sizeof_int = PR_BYTES_PER_INT;
sizeof_int64 = PR_BYTES_PER_INT64;
sizeof_long = PR_BYTES_PER_LONG;
sizeof_float = PR_BYTES_PER_FLOAT;
sizeof_double = PR_BYTES_PER_DOUBLE;
sizeof_word = PR_BYTES_PER_WORD;
sizeof_dword = PR_BYTES_PER_DWORD;
bits_per_int64_log2 = PR_BITS_PER_INT64_LOG2;
align_of_short = PR_ALIGN_OF_SHORT;
align_of_int = PR_ALIGN_OF_INT;
align_of_long = PR_ALIGN_OF_LONG;
align_of_int64 = PR_ALIGN_OF_INT64;
align_of_float = PR_ALIGN_OF_FLOAT;
align_of_double = PR_ALIGN_OF_DOUBLE;
align_of_pointer = PR_ALIGN_OF_POINTER;
align_of_word = PR_ALIGN_OF_WORD;
#else /* !CROSS_COMPILE */
/*
* 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;
}
}
sizeof_char = sizeof(char);
sizeof_short = sizeof(short);
sizeof_int = sizeof(int);
sizeof_int64 = 8;
sizeof_long = sizeof(long);
sizeof_float = sizeof(float);
sizeof_double = sizeof(double);
sizeof_word = sizeof(prword);
sizeof_dword = 8;
bits_per_int64_log2 = 6;
align_of_short = ALIGN_OF(short);
align_of_int = ALIGN_OF(int);
align_of_long = ALIGN_OF(long);
if (sizeof(INT64) < 8) {
/* this machine doesn't actually support int64's */
align_of_int64 = ALIGN_OF(fakelonglong);
} else {
align_of_int64 = ALIGN_OF(int64);
}
align_of_float = ALIGN_OF(float);
align_of_double = ALIGN_OF(double);
align_of_pointer = ALIGN_OF(pointer);
align_of_word = ALIGN_OF(prword);
#endif /* CROSS_COMPILE */
printf("#define JS_BYTES_PER_BYTE %dL\n", sizeof_char);
printf("#define JS_BYTES_PER_SHORT %dL\n", sizeof_short);
printf("#define JS_BYTES_PER_INT %dL\n", sizeof_int);
printf("#define JS_BYTES_PER_INT64 %dL\n", sizeof_int64);
printf("#define JS_BYTES_PER_LONG %dL\n", sizeof_long);
printf("#define JS_BYTES_PER_FLOAT %dL\n", sizeof_float);
printf("#define JS_BYTES_PER_DOUBLE %dL\n", sizeof_double);
printf("#define JS_BYTES_PER_WORD %dL\n", sizeof_word);
printf("#define JS_BYTES_PER_DWORD %dL\n", sizeof_dword);
printf("\n");
printf("#define JS_BITS_PER_BYTE %dL\n", bpb);
printf("#define JS_BITS_PER_SHORT %dL\n", bpb * sizeof_short);
printf("#define JS_BITS_PER_INT %dL\n", bpb * sizeof_int);
printf("#define JS_BITS_PER_INT64 %dL\n", bpb * sizeof_int64);
printf("#define JS_BITS_PER_LONG %dL\n", bpb * sizeof_long);
printf("#define JS_BITS_PER_FLOAT %dL\n", bpb * sizeof_float);
printf("#define JS_BITS_PER_DOUBLE %dL\n", bpb * sizeof_double);
printf("#define JS_BITS_PER_WORD %dL\n", bpb * sizeof_word);
printf("\n");
printf("#define JS_BITS_PER_BYTE_LOG2 %dL\n", Log2(bpb));
printf("#define JS_BITS_PER_SHORT_LOG2 %dL\n", Log2(bpb * sizeof_short));
printf("#define JS_BITS_PER_INT_LOG2 %dL\n", Log2(bpb * sizeof_int));
printf("#define JS_BITS_PER_INT64_LOG2 %dL\n", bits_per_int64_log2);
printf("#define JS_BITS_PER_LONG_LOG2 %dL\n", Log2(bpb * sizeof_long));
printf("#define JS_BITS_PER_FLOAT_LOG2 %dL\n", Log2(bpb * sizeof_float));
printf("#define JS_BITS_PER_DOUBLE_LOG2 %dL\n", Log2(bpb * sizeof_double));
printf("#define JS_BITS_PER_WORD_LOG2 %dL\n", Log2(bpb * sizeof_word));
printf("\n");
printf("#define JS_ALIGN_OF_SHORT %dL\n", align_of_short);
printf("#define JS_ALIGN_OF_INT %dL\n", align_of_int);
printf("#define JS_ALIGN_OF_LONG %dL\n", align_of_long);
printf("#define JS_ALIGN_OF_INT64 %dL\n", align_of_int64);
printf("#define JS_ALIGN_OF_FLOAT %dL\n", align_of_float);
printf("#define JS_ALIGN_OF_DOUBLE %dL\n", align_of_double);
printf("#define JS_ALIGN_OF_POINTER %dL\n", align_of_pointer);
printf("#define JS_ALIGN_OF_WORD %dL\n", align_of_word);
printf("\n");
printf("#define JS_BYTES_PER_WORD_LOG2 %dL\n", Log2(sizeof_word));
printf("#define JS_BYTES_PER_DWORD_LOG2 %dL\n", Log2(sizeof_dword));
printf("#define JS_WORDS_PER_DWORD_LOG2 %dL\n", Log2(sizeof_dword/sizeof_word));
printf("\n");
printf("#define JS_STACK_GROWTH_DIRECTION (%d)\n", StackGrowthDirection(&dummy1));
printf("\n");
printf("#endif /* js_cpucfg___ */\n");
return EXIT_SUCCESS;
}
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