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1220 lines
28 KiB
Plaintext
1220 lines
28 KiB
Plaintext
/* Parse C expressions for CCCP.
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Copyright (C) 1987, 1992, 1994, 1995, 1996, 1997 Free Software Foundation.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding!
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Adapted from expread.y of GDB by Paul Rubin, July 1986. */
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/* Parse a C expression from text in a string */
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%{
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#include "config.h"
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#include <setjmp.h>
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/* #define YYDEBUG 1 */
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/* The following symbols should be autoconfigured:
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HAVE_STDLIB_H
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STDC_HEADERS
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In the mean time, we'll get by with approximations based
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on existing GCC configuration symbols. */
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#ifdef POSIX
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# ifndef HAVE_STDLIB_H
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# define HAVE_STDLIB_H 1
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# endif
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# ifndef STDC_HEADERS
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# define STDC_HEADERS 1
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# endif
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#endif /* defined (POSIX) */
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#if STDC_HEADERS
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# include <string.h>
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#endif
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#if HAVE_STDLIB_H || defined (MULTIBYTE_CHARS)
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# include <stdlib.h>
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#endif
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#ifdef MULTIBYTE_CHARS
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#include <locale.h>
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#endif
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#include <stdio.h>
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typedef unsigned char U_CHAR;
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/* This is used for communicating lists of keywords with cccp.c. */
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struct arglist {
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struct arglist *next;
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U_CHAR *name;
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int length;
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int argno;
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};
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/* Define a generic NULL if one hasn't already been defined. */
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#ifndef NULL
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#define NULL 0
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#endif
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#ifndef GENERIC_PTR
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#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
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#define GENERIC_PTR void *
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#else
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#define GENERIC_PTR char *
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#endif
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#endif
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#ifndef NULL_PTR
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#define NULL_PTR ((GENERIC_PTR) 0)
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#endif
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/* Find the largest host integer type and set its size and type.
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Don't blindly use `long'; on some crazy hosts it is shorter than `int'. */
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#ifndef HOST_BITS_PER_WIDE_INT
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#if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
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#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
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#define HOST_WIDE_INT long
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#else
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#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
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#define HOST_WIDE_INT int
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#endif
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#endif
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#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
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# define __attribute__(x)
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#endif
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#ifndef PROTO
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# if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
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# define PROTO(ARGS) ARGS
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# else
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# define PROTO(ARGS) ()
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# endif
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#endif
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#if defined (__STDC__) && defined (HAVE_VPRINTF)
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# include <stdarg.h>
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# define VA_START(va_list, var) va_start (va_list, var)
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# define PRINTF_ALIST(msg) char *msg, ...
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# define PRINTF_DCL(msg)
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# define PRINTF_PROTO(ARGS, m, n) PROTO (ARGS) __attribute__ ((format (__printf__, m, n)))
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#else
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# include <varargs.h>
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# define VA_START(va_list, var) va_start (va_list)
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# define PRINTF_ALIST(msg) msg, va_alist
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# define PRINTF_DCL(msg) char *msg; va_dcl
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# define PRINTF_PROTO(ARGS, m, n) () __attribute__ ((format (__printf__, m, n)))
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# define vfprintf(file, msg, args) \
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{ \
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char *a0 = va_arg(args, char *); \
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char *a1 = va_arg(args, char *); \
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char *a2 = va_arg(args, char *); \
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char *a3 = va_arg(args, char *); \
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fprintf (file, msg, a0, a1, a2, a3); \
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}
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#endif
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#define PRINTF_PROTO_1(ARGS) PRINTF_PROTO(ARGS, 1, 2)
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HOST_WIDE_INT parse_c_expression PROTO((char *));
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static int yylex PROTO((void));
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static void yyerror PROTO((char *)) __attribute__ ((noreturn));
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static HOST_WIDE_INT expression_value;
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static jmp_buf parse_return_error;
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/* Nonzero means count most punctuation as part of a name. */
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static int keyword_parsing = 0;
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/* Nonzero means do not evaluate this expression.
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This is a count, since unevaluated expressions can nest. */
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static int skip_evaluation;
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/* some external tables of character types */
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extern unsigned char is_idstart[], is_idchar[], is_space[];
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/* Flag for -pedantic. */
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extern int pedantic;
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/* Flag for -traditional. */
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extern int traditional;
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/* Flag for -lang-c89. */
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extern int c89;
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/* Flag for -Wundef. */
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extern int warn_undef;
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#ifndef CHAR_TYPE_SIZE
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#define CHAR_TYPE_SIZE BITS_PER_UNIT
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#endif
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#ifndef INT_TYPE_SIZE
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#define INT_TYPE_SIZE BITS_PER_WORD
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#endif
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#ifndef LONG_TYPE_SIZE
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#define LONG_TYPE_SIZE BITS_PER_WORD
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#endif
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#ifndef WCHAR_TYPE_SIZE
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#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
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#endif
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#ifndef MAX_CHAR_TYPE_SIZE
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#define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE
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#endif
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#ifndef MAX_INT_TYPE_SIZE
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#define MAX_INT_TYPE_SIZE INT_TYPE_SIZE
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#endif
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#ifndef MAX_LONG_TYPE_SIZE
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#define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE
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#endif
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#ifndef MAX_WCHAR_TYPE_SIZE
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#define MAX_WCHAR_TYPE_SIZE WCHAR_TYPE_SIZE
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#endif
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#if MAX_CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT
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#define MAX_CHAR_TYPE_MASK (~ (~ (HOST_WIDE_INT) 0 << MAX_CHAR_TYPE_SIZE))
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#else
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#define MAX_CHAR_TYPE_MASK (~ (HOST_WIDE_INT) 0)
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#endif
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#if MAX_WCHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT
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#define MAX_WCHAR_TYPE_MASK (~ (~ (HOST_WIDE_INT) 0 << MAX_WCHAR_TYPE_SIZE))
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#else
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#define MAX_WCHAR_TYPE_MASK (~ (HOST_WIDE_INT) 0)
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#endif
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/* Suppose A1 + B1 = SUM1, using 2's complement arithmetic ignoring overflow.
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Suppose A, B and SUM have the same respective signs as A1, B1, and SUM1.
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Suppose SIGNEDP is negative if the result is signed, zero if unsigned.
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Then this yields nonzero if overflow occurred during the addition.
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Overflow occurs if A and B have the same sign, but A and SUM differ in sign,
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and SIGNEDP is negative.
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Use `^' to test whether signs differ, and `< 0' to isolate the sign. */
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#define overflow_sum_sign(a, b, sum, signedp) \
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((~((a) ^ (b)) & ((a) ^ (sum)) & (signedp)) < 0)
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struct constant;
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GENERIC_PTR xmalloc PROTO((size_t));
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HOST_WIDE_INT parse_escape PROTO((char **, HOST_WIDE_INT));
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int check_assertion PROTO((U_CHAR *, int, int, struct arglist *));
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struct hashnode *lookup PROTO((U_CHAR *, int, int));
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void error PRINTF_PROTO_1((char *, ...));
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void pedwarn PRINTF_PROTO_1((char *, ...));
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void warning PRINTF_PROTO_1((char *, ...));
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static int parse_number PROTO((int));
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static HOST_WIDE_INT left_shift PROTO((struct constant *, unsigned HOST_WIDE_INT));
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static HOST_WIDE_INT right_shift PROTO((struct constant *, unsigned HOST_WIDE_INT));
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static void integer_overflow PROTO((void));
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/* `signedp' values */
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#define SIGNED (~0)
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#define UNSIGNED 0
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%}
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%union {
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struct constant {HOST_WIDE_INT value; int signedp;} integer;
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struct name {U_CHAR *address; int length;} name;
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struct arglist *keywords;
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}
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%type <integer> exp exp1 start
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%type <keywords> keywords
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%token <integer> INT CHAR
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%token <name> NAME
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%token <integer> ERROR
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%right '?' ':'
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%left ','
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%left OR
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%left AND
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%left '|'
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%left '^'
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%left '&'
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%left EQUAL NOTEQUAL
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%left '<' '>' LEQ GEQ
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%left LSH RSH
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%left '+' '-'
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%left '*' '/' '%'
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%right UNARY
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/* %expect 40 */
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%%
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start : exp1
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{ expression_value = $1.value; }
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;
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/* Expressions, including the comma operator. */
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exp1 : exp
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| exp1 ',' exp
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{ if (pedantic)
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pedwarn ("comma operator in operand of `#if'");
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$$ = $3; }
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;
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/* Expressions, not including the comma operator. */
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exp : '-' exp %prec UNARY
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{ $$.value = - $2.value;
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$$.signedp = $2.signedp;
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if (($$.value & $2.value & $$.signedp) < 0)
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integer_overflow (); }
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| '!' exp %prec UNARY
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{ $$.value = ! $2.value;
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$$.signedp = SIGNED; }
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| '+' exp %prec UNARY
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{ $$ = $2; }
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| '~' exp %prec UNARY
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{ $$.value = ~ $2.value;
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$$.signedp = $2.signedp; }
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| '#' NAME
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{ $$.value = check_assertion ($2.address, $2.length,
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0, NULL_PTR);
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$$.signedp = SIGNED; }
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| '#' NAME
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{ keyword_parsing = 1; }
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'(' keywords ')'
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{ $$.value = check_assertion ($2.address, $2.length,
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1, $5);
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keyword_parsing = 0;
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$$.signedp = SIGNED; }
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| '(' exp1 ')'
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{ $$ = $2; }
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;
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/* Binary operators in order of decreasing precedence. */
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exp : exp '*' exp
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{ $$.signedp = $1.signedp & $3.signedp;
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if ($$.signedp)
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{
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$$.value = $1.value * $3.value;
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if ($1.value
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&& ($$.value / $1.value != $3.value
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|| ($$.value & $1.value & $3.value) < 0))
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integer_overflow ();
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}
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else
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$$.value = ((unsigned HOST_WIDE_INT) $1.value
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* $3.value); }
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| exp '/' exp
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{ if ($3.value == 0)
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{
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if (!skip_evaluation)
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error ("division by zero in #if");
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$3.value = 1;
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}
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$$.signedp = $1.signedp & $3.signedp;
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if ($$.signedp)
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{
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$$.value = $1.value / $3.value;
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if (($$.value & $1.value & $3.value) < 0)
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integer_overflow ();
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}
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else
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$$.value = ((unsigned HOST_WIDE_INT) $1.value
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/ $3.value); }
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| exp '%' exp
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{ if ($3.value == 0)
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{
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if (!skip_evaluation)
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error ("division by zero in #if");
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$3.value = 1;
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}
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$$.signedp = $1.signedp & $3.signedp;
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if ($$.signedp)
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$$.value = $1.value % $3.value;
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else
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$$.value = ((unsigned HOST_WIDE_INT) $1.value
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% $3.value); }
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| exp '+' exp
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{ $$.value = $1.value + $3.value;
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$$.signedp = $1.signedp & $3.signedp;
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if (overflow_sum_sign ($1.value, $3.value,
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$$.value, $$.signedp))
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integer_overflow (); }
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| exp '-' exp
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{ $$.value = $1.value - $3.value;
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$$.signedp = $1.signedp & $3.signedp;
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if (overflow_sum_sign ($$.value, $3.value,
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$1.value, $$.signedp))
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integer_overflow (); }
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| exp LSH exp
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{ $$.signedp = $1.signedp;
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if (($3.value & $3.signedp) < 0)
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$$.value = right_shift (&$1, -$3.value);
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else
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$$.value = left_shift (&$1, $3.value); }
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| exp RSH exp
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{ $$.signedp = $1.signedp;
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if (($3.value & $3.signedp) < 0)
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$$.value = left_shift (&$1, -$3.value);
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else
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$$.value = right_shift (&$1, $3.value); }
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| exp EQUAL exp
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{ $$.value = ($1.value == $3.value);
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$$.signedp = SIGNED; }
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| exp NOTEQUAL exp
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{ $$.value = ($1.value != $3.value);
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$$.signedp = SIGNED; }
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| exp LEQ exp
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{ $$.signedp = SIGNED;
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if ($1.signedp & $3.signedp)
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$$.value = $1.value <= $3.value;
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else
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$$.value = ((unsigned HOST_WIDE_INT) $1.value
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<= $3.value); }
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| exp GEQ exp
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{ $$.signedp = SIGNED;
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if ($1.signedp & $3.signedp)
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$$.value = $1.value >= $3.value;
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else
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$$.value = ((unsigned HOST_WIDE_INT) $1.value
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>= $3.value); }
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| exp '<' exp
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{ $$.signedp = SIGNED;
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if ($1.signedp & $3.signedp)
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$$.value = $1.value < $3.value;
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else
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$$.value = ((unsigned HOST_WIDE_INT) $1.value
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< $3.value); }
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| exp '>' exp
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{ $$.signedp = SIGNED;
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if ($1.signedp & $3.signedp)
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$$.value = $1.value > $3.value;
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else
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$$.value = ((unsigned HOST_WIDE_INT) $1.value
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> $3.value); }
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| exp '&' exp
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{ $$.value = $1.value & $3.value;
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$$.signedp = $1.signedp & $3.signedp; }
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| exp '^' exp
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{ $$.value = $1.value ^ $3.value;
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$$.signedp = $1.signedp & $3.signedp; }
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| exp '|' exp
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{ $$.value = $1.value | $3.value;
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$$.signedp = $1.signedp & $3.signedp; }
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| exp AND
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{ skip_evaluation += !$1.value; }
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exp
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{ skip_evaluation -= !$1.value;
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$$.value = ($1.value && $4.value);
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$$.signedp = SIGNED; }
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| exp OR
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{ skip_evaluation += !!$1.value; }
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exp
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{ skip_evaluation -= !!$1.value;
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$$.value = ($1.value || $4.value);
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$$.signedp = SIGNED; }
|
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| exp '?'
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{ skip_evaluation += !$1.value; }
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exp ':'
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{ skip_evaluation += !!$1.value - !$1.value; }
|
||
exp
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||
{ skip_evaluation -= !!$1.value;
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$$.value = $1.value ? $4.value : $7.value;
|
||
$$.signedp = $4.signedp & $7.signedp; }
|
||
| INT
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{ $$ = yylval.integer; }
|
||
| CHAR
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{ $$ = yylval.integer; }
|
||
| NAME
|
||
{ if (warn_undef && !skip_evaluation)
|
||
warning ("`%.*s' is not defined",
|
||
$1.length, $1.address);
|
||
$$.value = 0;
|
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$$.signedp = SIGNED; }
|
||
;
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|
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keywords :
|
||
{ $$ = 0; }
|
||
| '(' keywords ')' keywords
|
||
{ struct arglist *temp;
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||
$$ = (struct arglist *) xmalloc (sizeof (struct arglist));
|
||
$$->next = $2;
|
||
$$->name = (U_CHAR *) "(";
|
||
$$->length = 1;
|
||
temp = $$;
|
||
while (temp != 0 && temp->next != 0)
|
||
temp = temp->next;
|
||
temp->next = (struct arglist *) xmalloc (sizeof (struct arglist));
|
||
temp->next->next = $4;
|
||
temp->next->name = (U_CHAR *) ")";
|
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temp->next->length = 1; }
|
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| NAME keywords
|
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{ $$ = (struct arglist *) xmalloc (sizeof (struct arglist));
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$$->name = $1.address;
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||
$$->length = $1.length;
|
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$$->next = $2; }
|
||
;
|
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%%
|
||
|
||
/* During parsing of a C expression, the pointer to the next character
|
||
is in this variable. */
|
||
|
||
static char *lexptr;
|
||
|
||
/* Take care of parsing a number (anything that starts with a digit).
|
||
Set yylval and return the token type; update lexptr.
|
||
LEN is the number of characters in it. */
|
||
|
||
/* maybe needs to actually deal with floating point numbers */
|
||
|
||
static int
|
||
parse_number (olen)
|
||
int olen;
|
||
{
|
||
register char *p = lexptr;
|
||
register int c;
|
||
register unsigned HOST_WIDE_INT n = 0, nd, max_over_base;
|
||
register int base = 10;
|
||
register int len = olen;
|
||
register int overflow = 0;
|
||
register int digit, largest_digit = 0;
|
||
int spec_long = 0;
|
||
|
||
yylval.integer.signedp = SIGNED;
|
||
|
||
if (*p == '0') {
|
||
base = 8;
|
||
if (len >= 3 && (p[1] == 'x' || p[1] == 'X')) {
|
||
p += 2;
|
||
base = 16;
|
||
len -= 2;
|
||
}
|
||
}
|
||
|
||
max_over_base = (unsigned HOST_WIDE_INT) -1 / base;
|
||
|
||
for (; len > 0; len--) {
|
||
c = *p++;
|
||
|
||
if (c >= '0' && c <= '9')
|
||
digit = c - '0';
|
||
else if (base == 16 && c >= 'a' && c <= 'f')
|
||
digit = c - 'a' + 10;
|
||
else if (base == 16 && c >= 'A' && c <= 'F')
|
||
digit = c - 'A' + 10;
|
||
else {
|
||
/* `l' means long, and `u' means unsigned. */
|
||
while (1) {
|
||
if (c == 'l' || c == 'L')
|
||
{
|
||
if (!pedantic < spec_long)
|
||
yyerror ("too many `l's in integer constant");
|
||
spec_long++;
|
||
}
|
||
else if (c == 'u' || c == 'U')
|
||
{
|
||
if (! yylval.integer.signedp)
|
||
yyerror ("two `u's in integer constant");
|
||
yylval.integer.signedp = UNSIGNED;
|
||
}
|
||
else {
|
||
if (c == '.' || c == 'e' || c == 'E' || c == 'p' || c == 'P')
|
||
yyerror ("Floating point numbers not allowed in #if expressions");
|
||
else {
|
||
char *buf = (char *) alloca (p - lexptr + 40);
|
||
sprintf (buf, "missing white space after number `%.*s'",
|
||
(int) (p - lexptr - 1), lexptr);
|
||
yyerror (buf);
|
||
}
|
||
}
|
||
|
||
if (--len == 0)
|
||
break;
|
||
c = *p++;
|
||
}
|
||
/* Don't look for any more digits after the suffixes. */
|
||
break;
|
||
}
|
||
if (largest_digit < digit)
|
||
largest_digit = digit;
|
||
nd = n * base + digit;
|
||
overflow |= (max_over_base < n) | (nd < n);
|
||
n = nd;
|
||
}
|
||
|
||
if (base <= largest_digit)
|
||
pedwarn ("integer constant contains digits beyond the radix");
|
||
|
||
if (overflow)
|
||
pedwarn ("integer constant out of range");
|
||
|
||
/* If too big to be signed, consider it unsigned. */
|
||
if (((HOST_WIDE_INT) n & yylval.integer.signedp) < 0)
|
||
{
|
||
if (base == 10)
|
||
warning ("integer constant is so large that it is unsigned");
|
||
yylval.integer.signedp = UNSIGNED;
|
||
}
|
||
|
||
lexptr = p;
|
||
yylval.integer.value = n;
|
||
return INT;
|
||
}
|
||
|
||
struct token {
|
||
char *operator;
|
||
int token;
|
||
};
|
||
|
||
static struct token tokentab2[] = {
|
||
{"&&", AND},
|
||
{"||", OR},
|
||
{"<<", LSH},
|
||
{">>", RSH},
|
||
{"==", EQUAL},
|
||
{"!=", NOTEQUAL},
|
||
{"<=", LEQ},
|
||
{">=", GEQ},
|
||
{"++", ERROR},
|
||
{"--", ERROR},
|
||
{NULL, ERROR}
|
||
};
|
||
|
||
/* Read one token, getting characters through lexptr. */
|
||
|
||
static int
|
||
yylex ()
|
||
{
|
||
register int c;
|
||
register int namelen;
|
||
register unsigned char *tokstart;
|
||
register struct token *toktab;
|
||
int wide_flag;
|
||
HOST_WIDE_INT mask;
|
||
|
||
retry:
|
||
|
||
tokstart = (unsigned char *) lexptr;
|
||
c = *tokstart;
|
||
/* See if it is a special token of length 2. */
|
||
if (! keyword_parsing)
|
||
for (toktab = tokentab2; toktab->operator != NULL; toktab++)
|
||
if (c == *toktab->operator && tokstart[1] == toktab->operator[1]) {
|
||
lexptr += 2;
|
||
if (toktab->token == ERROR)
|
||
{
|
||
char *buf = (char *) alloca (40);
|
||
sprintf (buf, "`%s' not allowed in operand of `#if'", toktab->operator);
|
||
yyerror (buf);
|
||
}
|
||
return toktab->token;
|
||
}
|
||
|
||
switch (c) {
|
||
case '\n':
|
||
return 0;
|
||
|
||
case ' ':
|
||
case '\t':
|
||
case '\r':
|
||
lexptr++;
|
||
goto retry;
|
||
|
||
case 'L':
|
||
/* Capital L may start a wide-string or wide-character constant. */
|
||
if (lexptr[1] == '\'')
|
||
{
|
||
lexptr++;
|
||
wide_flag = 1;
|
||
mask = MAX_WCHAR_TYPE_MASK;
|
||
goto char_constant;
|
||
}
|
||
if (lexptr[1] == '"')
|
||
{
|
||
lexptr++;
|
||
wide_flag = 1;
|
||
mask = MAX_WCHAR_TYPE_MASK;
|
||
goto string_constant;
|
||
}
|
||
break;
|
||
|
||
case '\'':
|
||
wide_flag = 0;
|
||
mask = MAX_CHAR_TYPE_MASK;
|
||
char_constant:
|
||
lexptr++;
|
||
if (keyword_parsing) {
|
||
char *start_ptr = lexptr - 1;
|
||
while (1) {
|
||
c = *lexptr++;
|
||
if (c == '\\')
|
||
c = parse_escape (&lexptr, mask);
|
||
else if (c == '\'')
|
||
break;
|
||
}
|
||
yylval.name.address = tokstart;
|
||
yylval.name.length = lexptr - start_ptr;
|
||
return NAME;
|
||
}
|
||
|
||
/* This code for reading a character constant
|
||
handles multicharacter constants and wide characters.
|
||
It is mostly copied from c-lex.c. */
|
||
{
|
||
register HOST_WIDE_INT result = 0;
|
||
register num_chars = 0;
|
||
unsigned width = MAX_CHAR_TYPE_SIZE;
|
||
int max_chars;
|
||
char *token_buffer;
|
||
|
||
if (wide_flag)
|
||
{
|
||
width = MAX_WCHAR_TYPE_SIZE;
|
||
#ifdef MULTIBYTE_CHARS
|
||
max_chars = MB_CUR_MAX;
|
||
#else
|
||
max_chars = 1;
|
||
#endif
|
||
}
|
||
else
|
||
max_chars = MAX_LONG_TYPE_SIZE / width;
|
||
|
||
token_buffer = (char *) alloca (max_chars + 1);
|
||
|
||
while (1)
|
||
{
|
||
c = *lexptr++;
|
||
|
||
if (c == '\'' || c == EOF)
|
||
break;
|
||
|
||
if (c == '\\')
|
||
{
|
||
c = parse_escape (&lexptr, mask);
|
||
}
|
||
|
||
num_chars++;
|
||
|
||
/* Merge character into result; ignore excess chars. */
|
||
if (num_chars <= max_chars)
|
||
{
|
||
if (width < HOST_BITS_PER_WIDE_INT)
|
||
result = (result << width) | c;
|
||
else
|
||
result = c;
|
||
token_buffer[num_chars - 1] = c;
|
||
}
|
||
}
|
||
|
||
token_buffer[num_chars] = 0;
|
||
|
||
if (c != '\'')
|
||
error ("malformatted character constant");
|
||
else if (num_chars == 0)
|
||
error ("empty character constant");
|
||
else if (num_chars > max_chars)
|
||
{
|
||
num_chars = max_chars;
|
||
error ("character constant too long");
|
||
}
|
||
else if (num_chars != 1 && ! traditional)
|
||
warning ("multi-character character constant");
|
||
|
||
/* If char type is signed, sign-extend the constant. */
|
||
if (! wide_flag)
|
||
{
|
||
int num_bits = num_chars * width;
|
||
|
||
if (lookup ((U_CHAR *) "__CHAR_UNSIGNED__",
|
||
sizeof ("__CHAR_UNSIGNED__") - 1, -1)
|
||
|| ((result >> (num_bits - 1)) & 1) == 0)
|
||
yylval.integer.value
|
||
= result & (~ (unsigned HOST_WIDE_INT) 0
|
||
>> (HOST_BITS_PER_WIDE_INT - num_bits));
|
||
else
|
||
yylval.integer.value
|
||
= result | ~(~ (unsigned HOST_WIDE_INT) 0
|
||
>> (HOST_BITS_PER_WIDE_INT - num_bits));
|
||
}
|
||
else
|
||
{
|
||
#ifdef MULTIBYTE_CHARS
|
||
/* Set the initial shift state and convert the next sequence. */
|
||
result = 0;
|
||
/* In all locales L'\0' is zero and mbtowc will return zero,
|
||
so don't use it. */
|
||
if (num_chars > 1
|
||
|| (num_chars == 1 && token_buffer[0] != '\0'))
|
||
{
|
||
wchar_t wc;
|
||
(void) mbtowc (NULL_PTR, NULL_PTR, 0);
|
||
if (mbtowc (& wc, token_buffer, num_chars) == num_chars)
|
||
result = wc;
|
||
else
|
||
pedwarn ("Ignoring invalid multibyte character");
|
||
}
|
||
#endif
|
||
yylval.integer.value = result;
|
||
}
|
||
}
|
||
|
||
/* This is always a signed type. */
|
||
yylval.integer.signedp = SIGNED;
|
||
|
||
return CHAR;
|
||
|
||
/* some of these chars are invalid in constant expressions;
|
||
maybe do something about them later */
|
||
case '/':
|
||
case '+':
|
||
case '-':
|
||
case '*':
|
||
case '%':
|
||
case '|':
|
||
case '&':
|
||
case '^':
|
||
case '~':
|
||
case '!':
|
||
case '@':
|
||
case '<':
|
||
case '>':
|
||
case '[':
|
||
case ']':
|
||
case '.':
|
||
case '?':
|
||
case ':':
|
||
case '=':
|
||
case '{':
|
||
case '}':
|
||
case ',':
|
||
case '#':
|
||
if (keyword_parsing)
|
||
break;
|
||
case '(':
|
||
case ')':
|
||
lexptr++;
|
||
return c;
|
||
|
||
case '"':
|
||
mask = MAX_CHAR_TYPE_MASK;
|
||
string_constant:
|
||
if (keyword_parsing) {
|
||
char *start_ptr = lexptr;
|
||
lexptr++;
|
||
while (1) {
|
||
c = *lexptr++;
|
||
if (c == '\\')
|
||
c = parse_escape (&lexptr, mask);
|
||
else if (c == '"')
|
||
break;
|
||
}
|
||
yylval.name.address = tokstart;
|
||
yylval.name.length = lexptr - start_ptr;
|
||
return NAME;
|
||
}
|
||
yyerror ("string constants not allowed in #if expressions");
|
||
return ERROR;
|
||
}
|
||
|
||
if (c >= '0' && c <= '9' && !keyword_parsing) {
|
||
/* It's a number */
|
||
for (namelen = 1; ; namelen++) {
|
||
int d = tokstart[namelen];
|
||
if (! ((is_idchar[d] || d == '.')
|
||
|| ((d == '-' || d == '+')
|
||
&& (c == 'e' || c == 'E'
|
||
|| ((c == 'p' || c == 'P') && ! c89))
|
||
&& ! traditional)))
|
||
break;
|
||
c = d;
|
||
}
|
||
return parse_number (namelen);
|
||
}
|
||
|
||
/* It is a name. See how long it is. */
|
||
|
||
if (keyword_parsing) {
|
||
for (namelen = 0;; namelen++) {
|
||
if (is_space[tokstart[namelen]])
|
||
break;
|
||
if (tokstart[namelen] == '(' || tokstart[namelen] == ')')
|
||
break;
|
||
if (tokstart[namelen] == '"' || tokstart[namelen] == '\'')
|
||
break;
|
||
}
|
||
} else {
|
||
if (!is_idstart[c]) {
|
||
yyerror ("Invalid token in expression");
|
||
return ERROR;
|
||
}
|
||
|
||
for (namelen = 0; is_idchar[tokstart[namelen]]; namelen++)
|
||
;
|
||
}
|
||
|
||
lexptr += namelen;
|
||
yylval.name.address = tokstart;
|
||
yylval.name.length = namelen;
|
||
return NAME;
|
||
}
|
||
|
||
|
||
/* Parse a C escape sequence. STRING_PTR points to a variable
|
||
containing a pointer to the string to parse. That pointer
|
||
is updated past the characters we use. The value of the
|
||
escape sequence is returned.
|
||
|
||
RESULT_MASK is used to mask out the result;
|
||
an error is reported if bits are lost thereby.
|
||
|
||
A negative value means the sequence \ newline was seen,
|
||
which is supposed to be equivalent to nothing at all.
|
||
|
||
If \ is followed by a null character, we return a negative
|
||
value and leave the string pointer pointing at the null character.
|
||
|
||
If \ is followed by 000, we return 0 and leave the string pointer
|
||
after the zeros. A value of 0 does not mean end of string. */
|
||
|
||
HOST_WIDE_INT
|
||
parse_escape (string_ptr, result_mask)
|
||
char **string_ptr;
|
||
HOST_WIDE_INT result_mask;
|
||
{
|
||
register int c = *(*string_ptr)++;
|
||
switch (c)
|
||
{
|
||
case 'a':
|
||
return TARGET_BELL;
|
||
case 'b':
|
||
return TARGET_BS;
|
||
case 'e':
|
||
case 'E':
|
||
if (pedantic)
|
||
pedwarn ("non-ANSI-standard escape sequence, `\\%c'", c);
|
||
return 033;
|
||
case 'f':
|
||
return TARGET_FF;
|
||
case 'n':
|
||
return TARGET_NEWLINE;
|
||
case 'r':
|
||
return TARGET_CR;
|
||
case 't':
|
||
return TARGET_TAB;
|
||
case 'v':
|
||
return TARGET_VT;
|
||
case '\n':
|
||
return -2;
|
||
case 0:
|
||
(*string_ptr)--;
|
||
return 0;
|
||
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
{
|
||
register HOST_WIDE_INT i = c - '0';
|
||
register int count = 0;
|
||
while (++count < 3)
|
||
{
|
||
c = *(*string_ptr)++;
|
||
if (c >= '0' && c <= '7')
|
||
i = (i << 3) + c - '0';
|
||
else
|
||
{
|
||
(*string_ptr)--;
|
||
break;
|
||
}
|
||
}
|
||
if (i != (i & result_mask))
|
||
{
|
||
i &= result_mask;
|
||
pedwarn ("octal escape sequence out of range");
|
||
}
|
||
return i;
|
||
}
|
||
case 'x':
|
||
{
|
||
register unsigned HOST_WIDE_INT i = 0, overflow = 0;
|
||
register int digits_found = 0, digit;
|
||
for (;;)
|
||
{
|
||
c = *(*string_ptr)++;
|
||
if (c >= '0' && c <= '9')
|
||
digit = c - '0';
|
||
else if (c >= 'a' && c <= 'f')
|
||
digit = c - 'a' + 10;
|
||
else if (c >= 'A' && c <= 'F')
|
||
digit = c - 'A' + 10;
|
||
else
|
||
{
|
||
(*string_ptr)--;
|
||
break;
|
||
}
|
||
overflow |= i ^ (i << 4 >> 4);
|
||
i = (i << 4) + digit;
|
||
digits_found = 1;
|
||
}
|
||
if (!digits_found)
|
||
yyerror ("\\x used with no following hex digits");
|
||
if (overflow | (i != (i & result_mask)))
|
||
{
|
||
i &= result_mask;
|
||
pedwarn ("hex escape sequence out of range");
|
||
}
|
||
return i;
|
||
}
|
||
default:
|
||
return c;
|
||
}
|
||
}
|
||
|
||
static void
|
||
yyerror (s)
|
||
char *s;
|
||
{
|
||
error ("%s", s);
|
||
skip_evaluation = 0;
|
||
longjmp (parse_return_error, 1);
|
||
}
|
||
|
||
static void
|
||
integer_overflow ()
|
||
{
|
||
if (!skip_evaluation && pedantic)
|
||
pedwarn ("integer overflow in preprocessor expression");
|
||
}
|
||
|
||
static HOST_WIDE_INT
|
||
left_shift (a, b)
|
||
struct constant *a;
|
||
unsigned HOST_WIDE_INT b;
|
||
{
|
||
/* It's unclear from the C standard whether shifts can overflow.
|
||
The following code ignores overflow; perhaps a C standard
|
||
interpretation ruling is needed. */
|
||
if (b >= HOST_BITS_PER_WIDE_INT)
|
||
return 0;
|
||
else
|
||
return (unsigned HOST_WIDE_INT) a->value << b;
|
||
}
|
||
|
||
static HOST_WIDE_INT
|
||
right_shift (a, b)
|
||
struct constant *a;
|
||
unsigned HOST_WIDE_INT b;
|
||
{
|
||
if (b >= HOST_BITS_PER_WIDE_INT)
|
||
return a->signedp ? a->value >> (HOST_BITS_PER_WIDE_INT - 1) : 0;
|
||
else if (a->signedp)
|
||
return a->value >> b;
|
||
else
|
||
return (unsigned HOST_WIDE_INT) a->value >> b;
|
||
}
|
||
|
||
/* This page contains the entry point to this file. */
|
||
|
||
/* Parse STRING as an expression, and complain if this fails
|
||
to use up all of the contents of STRING. */
|
||
/* STRING may contain '\0' bytes; it is terminated by the first '\n'
|
||
outside a string constant, so that we can diagnose '\0' properly. */
|
||
/* We do not support C comments. They should be removed before
|
||
this function is called. */
|
||
|
||
HOST_WIDE_INT
|
||
parse_c_expression (string)
|
||
char *string;
|
||
{
|
||
lexptr = string;
|
||
|
||
/* if there is some sort of scanning error, just return 0 and assume
|
||
the parsing routine has printed an error message somewhere.
|
||
there is surely a better thing to do than this. */
|
||
if (setjmp (parse_return_error))
|
||
return 0;
|
||
|
||
if (yyparse () != 0)
|
||
abort ();
|
||
|
||
if (*lexptr != '\n')
|
||
error ("Junk after end of expression.");
|
||
|
||
return expression_value; /* set by yyparse () */
|
||
}
|
||
|
||
#ifdef TEST_EXP_READER
|
||
|
||
#if YYDEBUG
|
||
extern int yydebug;
|
||
#endif
|
||
|
||
int pedantic;
|
||
int traditional;
|
||
|
||
int main PROTO((int, char **));
|
||
static void initialize_random_junk PROTO((void));
|
||
|
||
/* Main program for testing purposes. */
|
||
int
|
||
main (argc, argv)
|
||
int argc;
|
||
char **argv;
|
||
{
|
||
int n, c;
|
||
char buf[1024];
|
||
|
||
pedantic = 1 < argc;
|
||
traditional = 2 < argc;
|
||
#if YYDEBUG
|
||
yydebug = 3 < argc;
|
||
#endif
|
||
initialize_random_junk ();
|
||
|
||
for (;;) {
|
||
printf ("enter expression: ");
|
||
n = 0;
|
||
while ((buf[n] = c = getchar ()) != '\n' && c != EOF)
|
||
n++;
|
||
if (c == EOF)
|
||
break;
|
||
printf ("parser returned %ld\n", (long) parse_c_expression (buf));
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* table to tell if char can be part of a C identifier. */
|
||
unsigned char is_idchar[256];
|
||
/* table to tell if char can be first char of a c identifier. */
|
||
unsigned char is_idstart[256];
|
||
/* table to tell if c is horizontal or vertical space. */
|
||
unsigned char is_space[256];
|
||
|
||
/*
|
||
* initialize random junk in the hash table and maybe other places
|
||
*/
|
||
static void
|
||
initialize_random_junk ()
|
||
{
|
||
register int i;
|
||
|
||
/*
|
||
* Set up is_idchar and is_idstart tables. These should be
|
||
* faster than saying (is_alpha (c) || c == '_'), etc.
|
||
* Must do set up these things before calling any routines tthat
|
||
* refer to them.
|
||
*/
|
||
for (i = 'a'; i <= 'z'; i++) {
|
||
++is_idchar[i - 'a' + 'A'];
|
||
++is_idchar[i];
|
||
++is_idstart[i - 'a' + 'A'];
|
||
++is_idstart[i];
|
||
}
|
||
for (i = '0'; i <= '9'; i++)
|
||
++is_idchar[i];
|
||
++is_idchar['_'];
|
||
++is_idstart['_'];
|
||
++is_idchar['$'];
|
||
++is_idstart['$'];
|
||
|
||
++is_space[' '];
|
||
++is_space['\t'];
|
||
++is_space['\v'];
|
||
++is_space['\f'];
|
||
++is_space['\n'];
|
||
++is_space['\r'];
|
||
}
|
||
|
||
void
|
||
error (PRINTF_ALIST (msg))
|
||
PRINTF_DCL (msg)
|
||
{
|
||
va_list args;
|
||
|
||
VA_START (args, msg);
|
||
fprintf (stderr, "error: ");
|
||
vfprintf (stderr, msg, args);
|
||
fprintf (stderr, "\n");
|
||
va_end (args);
|
||
}
|
||
|
||
void
|
||
pedwarn (PRINTF_ALIST (msg))
|
||
PRINTF_DCL (msg)
|
||
{
|
||
va_list args;
|
||
|
||
VA_START (args, msg);
|
||
fprintf (stderr, "pedwarn: ");
|
||
vfprintf (stderr, msg, args);
|
||
fprintf (stderr, "\n");
|
||
va_end (args);
|
||
}
|
||
|
||
void
|
||
warning (PRINTF_ALIST (msg))
|
||
PRINTF_DCL (msg)
|
||
{
|
||
va_list args;
|
||
|
||
VA_START (args, msg);
|
||
fprintf (stderr, "warning: ");
|
||
vfprintf (stderr, msg, args);
|
||
fprintf (stderr, "\n");
|
||
va_end (args);
|
||
}
|
||
|
||
int
|
||
check_assertion (name, sym_length, tokens_specified, tokens)
|
||
U_CHAR *name;
|
||
int sym_length;
|
||
int tokens_specified;
|
||
struct arglist *tokens;
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
struct hashnode *
|
||
lookup (name, len, hash)
|
||
U_CHAR *name;
|
||
int len;
|
||
int hash;
|
||
{
|
||
return (DEFAULT_SIGNED_CHAR) ? 0 : ((struct hashnode *) -1);
|
||
}
|
||
|
||
GENERIC_PTR
|
||
xmalloc (size)
|
||
size_t size;
|
||
{
|
||
return (GENERIC_PTR) malloc (size);
|
||
}
|
||
#endif
|