4.4BSD/usr/src/contrib/gcc-2.3.3/cexp.c
/* A Bison parser, made from cexp.y */
#define YYBISON 1 /* Identify Bison output. */
#define INT 258
#define CHAR 259
#define NAME 260
#define ERROR 261
#define OR 262
#define AND 263
#define EQUAL 264
#define NOTEQUAL 265
#define LEQ 266
#define GEQ 267
#define LSH 268
#define RSH 269
#define UNARY 270
#line 26 "cexp.y"
#include "config.h"
#include <setjmp.h>
/* #define YYDEBUG 1 */
#ifdef MULTIBYTE_CHARS
#include <stdlib.h>
#include <locale.h>
#endif
#include <stdio.h>
typedef unsigned char U_CHAR;
/* This is used for communicating lists of keywords with cccp.c. */
struct arglist {
struct arglist *next;
U_CHAR *name;
int length;
int argno;
};
/* Define a generic NULL if one hasn't already been defined. */
#ifndef NULL
#define NULL 0
#endif
#ifndef GENERIC_PTR
#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)
#define GENERIC_PTR void *
#else
#define GENERIC_PTR char *
#endif
#endif
#ifndef NULL_PTR
#define NULL_PTR ((GENERIC_PTR)0)
#endif
int yylex ();
void yyerror ();
int expression_value;
static jmp_buf parse_return_error;
/* Nonzero means count most punctuation as part of a name. */
static int keyword_parsing = 0;
/* some external tables of character types */
extern unsigned char is_idstart[], is_idchar[], is_hor_space[];
extern char *xmalloc ();
/* Flag for -pedantic. */
extern int pedantic;
/* Flag for -traditional. */
extern int traditional;
#ifndef CHAR_TYPE_SIZE
#define CHAR_TYPE_SIZE BITS_PER_UNIT
#endif
#ifndef INT_TYPE_SIZE
#define INT_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef LONG_TYPE_SIZE
#define LONG_TYPE_SIZE BITS_PER_WORD
#endif
#ifndef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
#endif
/* Yield nonzero if adding two numbers with A's and B's signs can yield a
number with SUM's sign, where A, B, and SUM are all C integers. */
#define possible_sum_sign(a, b, sum) ((((a) ^ (b)) | ~ ((a) ^ (sum))) < 0)
static void integer_overflow ();
static long left_shift ();
static long right_shift ();
#line 111 "cexp.y"
typedef union {
struct constant {long value; int unsignedp;} integer;
struct name {U_CHAR *address; int length;} name;
struct arglist *keywords;
int voidval;
char *sval;
} YYSTYPE;
#ifndef YYLTYPE
typedef
struct yyltype
{
int timestamp;
int first_line;
int first_column;
int last_line;
int last_column;
char *text;
}
yyltype;
#define YYLTYPE yyltype
#endif
#include <stdio.h>
#ifndef __STDC__
#define const
#endif
#define YYFINAL 73
#define YYFLAG -32768
#define YYNTBASE 34
#define YYTRANSLATE(x) ((unsigned)(x) <= 270 ? yytranslate[x] : 39)
static const char yytranslate[] = { 0,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 29, 2, 31, 2, 27, 14, 2, 32,
33, 25, 23, 9, 24, 2, 26, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 8, 2, 17,
2, 18, 7, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 13, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 12, 2, 30, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 1, 2, 3, 4, 5,
6, 10, 11, 15, 16, 19, 20, 21, 22, 28
};
static const short yyprhs[] = { 0,
0, 2, 4, 8, 11, 14, 17, 20, 23, 24,
31, 35, 39, 43, 47, 51, 55, 59, 63, 67,
71, 75, 79, 83, 87, 91, 95, 99, 103, 107,
113, 115, 117, 119, 120, 125
};
static const short yyrhs[] = { 35,
0, 36, 0, 35, 9, 36, 0, 24, 36, 0,
29, 36, 0, 23, 36, 0, 30, 36, 0, 31,
5, 0, 0, 31, 5, 37, 32, 38, 33, 0,
32, 35, 33, 0, 36, 25, 36, 0, 36, 26,
36, 0, 36, 27, 36, 0, 36, 23, 36, 0,
36, 24, 36, 0, 36, 21, 36, 0, 36, 22,
36, 0, 36, 15, 36, 0, 36, 16, 36, 0,
36, 19, 36, 0, 36, 20, 36, 0, 36, 17,
36, 0, 36, 18, 36, 0, 36, 14, 36, 0,
36, 13, 36, 0, 36, 12, 36, 0, 36, 11,
36, 0, 36, 10, 36, 0, 36, 7, 36, 8,
36, 0, 3, 0, 4, 0, 5, 0, 0, 32,
38, 33, 38, 0, 5, 38, 0
};
#if YYDEBUG != 0
static const short yyrline[] = { 0,
143, 148, 149, 156, 161, 164, 166, 169, 173, 175,
180, 185, 197, 212, 223, 230, 237, 243, 249, 252,
255, 261, 267, 273, 279, 282, 285, 288, 291, 294,
297, 299, 301, 306, 308, 321
};
static const char * const yytname[] = { "$","error","$illegal.","INT","CHAR",
"NAME","ERROR","'?'","':'","','","OR","AND","'|'","'^'","'&'","EQUAL","NOTEQUAL",
"'<'","'>'","LEQ","GEQ","LSH","RSH","'+'","'-'","'*'","'/'","'%'","UNARY","'!'",
"'~'","'#'","'('","')'","start","exp1","exp","@1","keywords",""
};
#endif
static const short yyr1[] = { 0,
34, 35, 35, 36, 36, 36, 36, 36, 37, 36,
36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
36, 36, 36, 36, 36, 36, 36, 36, 36, 36,
36, 36, 36, 38, 38, 38
};
static const short yyr2[] = { 0,
1, 1, 3, 2, 2, 2, 2, 2, 0, 6,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 5,
1, 1, 1, 0, 4, 2
};
static const short yydefact[] = { 0,
31, 32, 33, 0, 0, 0, 0, 0, 0, 1,
2, 6, 4, 5, 7, 8, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 11, 3,
0, 29, 28, 27, 26, 25, 19, 20, 23, 24,
21, 22, 17, 18, 15, 16, 12, 13, 14, 34,
0, 34, 34, 0, 30, 36, 0, 10, 34, 35,
0, 0, 0
};
static const short yydefgoto[] = { 71,
10, 11, 38, 64
};
static const short yypact[] = { 31,
-32768,-32768,-32768, 31, 31, 31, 31, 4, 31, 3,
80,-32768,-32768,-32768,-32768, 6, 32, 31, 31, 31,
31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
31, 31, 31, 31, 31, 31, 31, 7,-32768, 80,
59, 97, 113, 128, 142, 155, 25, 25, 162, 162,
162, 162, 167, 167, -19, -19,-32768,-32768,-32768, 5,
31, 5, 5, -20, 80,-32768, 20,-32768, 5,-32768,
40, 56,-32768
};
static const short yypgoto[] = {-32768,
49, -4,-32768, -58
};
#define YYLAST 194
static const short yytable[] = { 12,
13, 14, 15, 66, 67, 35, 36, 37, 16, 62,
70, 18, 68, 40, 41, 42, 43, 44, 45, 46,
47, 48, 49, 50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 1, 2, 3, 63, -9, 60, 72,
18, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 69, 4, 5, 73, 65, 17, 0, 6,
7, 8, 9, 0, 39, 19, 61, 0, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 19, 0, 0, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
31, 32, 33, 34, 35, 36, 37, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 22, 23, 24, 25, 26, 27,
28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 24, 25, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 25,
26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
36, 37, 31, 32, 33, 34, 35, 36, 37, 33,
34, 35, 36, 37
};
static const short yycheck[] = { 4,
5, 6, 7, 62, 63, 25, 26, 27, 5, 5,
69, 9, 33, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32, 33, 34,
35, 36, 37, 3, 4, 5, 32, 32, 32, 0,
9, 17, 18, 19, 20, 21, 22, 23, 24, 25,
26, 27, 33, 23, 24, 0, 61, 9, -1, 29,
30, 31, 32, -1, 33, 7, 8, -1, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 7, -1, -1, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, 26, 27, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25,
26, 27, 21, 22, 23, 24, 25, 26, 27, 23,
24, 25, 26, 27
};
/* -*-C-*- Note some compilers choke on comments on `#line' lines. */
#line 3 "bison.simple"
/* Skeleton output parser for bison,
Copyright (C) 1984, 1989, 1990 Bob Corbett and Richard Stallman
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef alloca
#ifdef __GNUC__
#define alloca __builtin_alloca
#else /* not GNU C. */
#if (!defined (__STDC__) && defined (sparc)) || defined (__sparc__)
#include <alloca.h>
#else /* not sparc */
#if defined (MSDOS) && !defined (__TURBOC__)
#include <malloc.h>
#else /* not MSDOS, or __TURBOC__ */
#if defined(_AIX)
#include <malloc.h>
#pragma alloca
#endif /* not _AIX */
#endif /* not MSDOS, or __TURBOC__ */
#endif /* not sparc. */
#endif /* not GNU C. */
#endif /* alloca not defined. */
/* This is the parser code that is written into each bison parser
when the %semantic_parser declaration is not specified in the grammar.
It was written by Richard Stallman by simplifying the hairy parser
used when %semantic_parser is specified. */
/* Note: there must be only one dollar sign in this file.
It is replaced by the list of actions, each action
as one case of the switch. */
#define yyerrok (yyerrstatus = 0)
#define yyclearin (yychar = YYEMPTY)
#define YYEMPTY -2
#define YYEOF 0
#define YYACCEPT return(0)
#define YYABORT return(1)
#define YYERROR goto yyerrlab1
/* Like YYERROR except do call yyerror.
This remains here temporarily to ease the
transition to the new meaning of YYERROR, for GCC.
Once GCC version 2 has supplanted version 1, this can go. */
#define YYFAIL goto yyerrlab
#define YYRECOVERING() (!!yyerrstatus)
#define YYBACKUP(token, value) \
do \
if (yychar == YYEMPTY && yylen == 1) \
{ yychar = (token), yylval = (value); \
yychar1 = YYTRANSLATE (yychar); \
YYPOPSTACK; \
goto yybackup; \
} \
else \
{ yyerror ("syntax error: cannot back up"); YYERROR; } \
while (0)
#define YYTERROR 1
#define YYERRCODE 256
#ifndef YYPURE
#define YYLEX yylex()
#endif
#ifdef YYPURE
#ifdef YYLSP_NEEDED
#define YYLEX yylex(&yylval, &yylloc)
#else
#define YYLEX yylex(&yylval)
#endif
#endif
/* If nonreentrant, generate the variables here */
#ifndef YYPURE
int yychar; /* the lookahead symbol */
YYSTYPE yylval; /* the semantic value of the */
/* lookahead symbol */
#ifdef YYLSP_NEEDED
YYLTYPE yylloc; /* location data for the lookahead */
/* symbol */
#endif
int yynerrs; /* number of parse errors so far */
#endif /* not YYPURE */
#if YYDEBUG != 0
int yydebug; /* nonzero means print parse trace */
/* Since this is uninitialized, it does not stop multiple parsers
from coexisting. */
#endif
/* YYINITDEPTH indicates the initial size of the parser's stacks */
#ifndef YYINITDEPTH
#define YYINITDEPTH 200
#endif
/* YYMAXDEPTH is the maximum size the stacks can grow to
(effective only if the built-in stack extension method is used). */
#if YYMAXDEPTH == 0
#undef YYMAXDEPTH
#endif
#ifndef YYMAXDEPTH
#define YYMAXDEPTH 10000
#endif
#if __GNUC__ > 1 /* GNU C and GNU C++ define this. */
#define __yy_bcopy(FROM,TO,COUNT) __builtin_memcpy(TO,FROM,COUNT)
#else /* not GNU C or C++ */
#ifndef __cplusplus
/* This is the most reliable way to avoid incompatibilities
in available built-in functions on various systems. */
static void
__yy_bcopy (from, to, count)
char *from;
char *to;
int count;
{
register char *f = from;
register char *t = to;
register int i = count;
while (i-- > 0)
*t++ = *f++;
}
#else /* __cplusplus */
/* This is the most reliable way to avoid incompatibilities
in available built-in functions on various systems. */
static void
__yy_bcopy (char *from, char *to, int count)
{
register char *f = from;
register char *t = to;
register int i = count;
while (i-- > 0)
*t++ = *f++;
}
#endif
#endif
#line 169 "bison.simple"
int
yyparse()
{
register int yystate;
register int yyn;
register short *yyssp;
register YYSTYPE *yyvsp;
int yyerrstatus; /* number of tokens to shift before error messages enabled */
int yychar1; /* lookahead token as an internal (translated) token number */
short yyssa[YYINITDEPTH]; /* the state stack */
YYSTYPE yyvsa[YYINITDEPTH]; /* the semantic value stack */
short *yyss = yyssa; /* refer to the stacks thru separate pointers */
YYSTYPE *yyvs = yyvsa; /* to allow yyoverflow to reallocate them elsewhere */
#ifdef YYLSP_NEEDED
YYLTYPE yylsa[YYINITDEPTH]; /* the location stack */
YYLTYPE *yyls = yylsa;
YYLTYPE *yylsp;
#define YYPOPSTACK (yyvsp--, yyssp--, yylsp--)
#else
#define YYPOPSTACK (yyvsp--, yyssp--)
#endif
int yystacksize = YYINITDEPTH;
#ifdef YYPURE
int yychar;
YYSTYPE yylval;
int yynerrs;
#ifdef YYLSP_NEEDED
YYLTYPE yylloc;
#endif
#endif
YYSTYPE yyval; /* the variable used to return */
/* semantic values from the action */
/* routines */
int yylen;
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Starting parse\n");
#endif
yystate = 0;
yyerrstatus = 0;
yynerrs = 0;
yychar = YYEMPTY; /* Cause a token to be read. */
/* Initialize stack pointers.
Waste one element of value and location stack
so that they stay on the same level as the state stack. */
yyssp = yyss - 1;
yyvsp = yyvs;
#ifdef YYLSP_NEEDED
yylsp = yyls;
#endif
/* Push a new state, which is found in yystate . */
/* In all cases, when you get here, the value and location stacks
have just been pushed. so pushing a state here evens the stacks. */
yynewstate:
*++yyssp = yystate;
if (yyssp >= yyss + yystacksize - 1)
{
/* Give user a chance to reallocate the stack */
/* Use copies of these so that the &'s don't force the real ones into memory. */
YYSTYPE *yyvs1 = yyvs;
short *yyss1 = yyss;
#ifdef YYLSP_NEEDED
YYLTYPE *yyls1 = yyls;
#endif
/* Get the current used size of the three stacks, in elements. */
int size = yyssp - yyss + 1;
#ifdef yyoverflow
/* Each stack pointer address is followed by the size of
the data in use in that stack, in bytes. */
yyoverflow("parser stack overflow",
&yyss1, size * sizeof (*yyssp),
&yyvs1, size * sizeof (*yyvsp),
#ifdef YYLSP_NEEDED
&yyls1, size * sizeof (*yylsp),
#endif
&yystacksize);
yyss = yyss1; yyvs = yyvs1;
#ifdef YYLSP_NEEDED
yyls = yyls1;
#endif
#else /* no yyoverflow */
/* Extend the stack our own way. */
if (yystacksize >= YYMAXDEPTH)
{
yyerror("parser stack overflow");
return 2;
}
yystacksize *= 2;
if (yystacksize > YYMAXDEPTH)
yystacksize = YYMAXDEPTH;
yyss = (short *) alloca (yystacksize * sizeof (*yyssp));
__yy_bcopy ((char *)yyss1, (char *)yyss, size * sizeof (*yyssp));
yyvs = (YYSTYPE *) alloca (yystacksize * sizeof (*yyvsp));
__yy_bcopy ((char *)yyvs1, (char *)yyvs, size * sizeof (*yyvsp));
#ifdef YYLSP_NEEDED
yyls = (YYLTYPE *) alloca (yystacksize * sizeof (*yylsp));
__yy_bcopy ((char *)yyls1, (char *)yyls, size * sizeof (*yylsp));
#endif
#endif /* no yyoverflow */
yyssp = yyss + size - 1;
yyvsp = yyvs + size - 1;
#ifdef YYLSP_NEEDED
yylsp = yyls + size - 1;
#endif
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Stack size increased to %d\n", yystacksize);
#endif
if (yyssp >= yyss + yystacksize - 1)
YYABORT;
}
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Entering state %d\n", yystate);
#endif
yybackup:
/* Do appropriate processing given the current state. */
/* Read a lookahead token if we need one and don't already have one. */
/* yyresume: */
/* First try to decide what to do without reference to lookahead token. */
yyn = yypact[yystate];
if (yyn == YYFLAG)
goto yydefault;
/* Not known => get a lookahead token if don't already have one. */
/* yychar is either YYEMPTY or YYEOF
or a valid token in external form. */
if (yychar == YYEMPTY)
{
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Reading a token: ");
#endif
yychar = YYLEX;
}
/* Convert token to internal form (in yychar1) for indexing tables with */
if (yychar <= 0) /* This means end of input. */
{
yychar1 = 0;
yychar = YYEOF; /* Don't call YYLEX any more */
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Now at end of input.\n");
#endif
}
else
{
yychar1 = YYTRANSLATE(yychar);
#if YYDEBUG != 0
if (yydebug)
{
fprintf (stderr, "Next token is %d (%s", yychar, yytname[yychar1]);
/* Give the individual parser a way to print the precise meaning
of a token, for further debugging info. */
#ifdef YYPRINT
YYPRINT (stderr, yychar, yylval);
#endif
fprintf (stderr, ")\n");
}
#endif
}
yyn += yychar1;
if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != yychar1)
goto yydefault;
yyn = yytable[yyn];
/* yyn is what to do for this token type in this state.
Negative => reduce, -yyn is rule number.
Positive => shift, yyn is new state.
New state is final state => don't bother to shift,
just return success.
0, or most negative number => error. */
if (yyn < 0)
{
if (yyn == YYFLAG)
goto yyerrlab;
yyn = -yyn;
goto yyreduce;
}
else if (yyn == 0)
goto yyerrlab;
if (yyn == YYFINAL)
YYACCEPT;
/* Shift the lookahead token. */
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Shifting token %d (%s), ", yychar, yytname[yychar1]);
#endif
/* Discard the token being shifted unless it is eof. */
if (yychar != YYEOF)
yychar = YYEMPTY;
*++yyvsp = yylval;
#ifdef YYLSP_NEEDED
*++yylsp = yylloc;
#endif
/* count tokens shifted since error; after three, turn off error status. */
if (yyerrstatus) yyerrstatus--;
yystate = yyn;
goto yynewstate;
/* Do the default action for the current state. */
yydefault:
yyn = yydefact[yystate];
if (yyn == 0)
goto yyerrlab;
/* Do a reduction. yyn is the number of a rule to reduce with. */
yyreduce:
yylen = yyr2[yyn];
yyval = yyvsp[1-yylen]; /* implement default value of the action */
#if YYDEBUG != 0
if (yydebug)
{
int i;
fprintf (stderr, "Reducing via rule %d (line %d), ",
yyn, yyrline[yyn]);
/* Print the symboles being reduced, and their result. */
for (i = yyprhs[yyn]; yyrhs[i] > 0; i++)
fprintf (stderr, "%s ", yytname[yyrhs[i]]);
fprintf (stderr, " -> %s\n", yytname[yyr1[yyn]]);
}
#endif
switch (yyn) {
case 1:
#line 144 "cexp.y"
{ expression_value = yyvsp[0].integer.value; ;
break;}
case 3:
#line 150 "cexp.y"
{ if (pedantic)
pedwarn ("comma operator in operand of `#if'");
yyval.integer = yyvsp[0].integer; ;
break;}
case 4:
#line 157 "cexp.y"
{ yyval.integer.value = - yyvsp[0].integer.value;
if ((yyval.integer.value & yyvsp[0].integer.value) < 0 && ! yyvsp[0].integer.unsignedp)
integer_overflow ();
yyval.integer.unsignedp = yyvsp[0].integer.unsignedp; ;
break;}
case 5:
#line 162 "cexp.y"
{ yyval.integer.value = ! yyvsp[0].integer.value;
yyval.integer.unsignedp = 0; ;
break;}
case 6:
#line 165 "cexp.y"
{ yyval.integer = yyvsp[0].integer; ;
break;}
case 7:
#line 167 "cexp.y"
{ yyval.integer.value = ~ yyvsp[0].integer.value;
yyval.integer.unsignedp = yyvsp[0].integer.unsignedp; ;
break;}
case 8:
#line 170 "cexp.y"
{ yyval.integer.value = check_assertion (yyvsp[0].name.address, yyvsp[0].name.length,
0, NULL_PTR);
yyval.integer.unsignedp = 0; ;
break;}
case 9:
#line 174 "cexp.y"
{ keyword_parsing = 1; ;
break;}
case 10:
#line 176 "cexp.y"
{ yyval.integer.value = check_assertion (yyvsp[-4].name.address, yyvsp[-4].name.length,
1, yyvsp[-1].keywords);
keyword_parsing = 0;
yyval.integer.unsignedp = 0; ;
break;}
case 11:
#line 181 "cexp.y"
{ yyval.integer = yyvsp[-1].integer; ;
break;}
case 12:
#line 186 "cexp.y"
{ yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
if (yyval.integer.unsignedp)
yyval.integer.value = (unsigned long) yyvsp[-2].integer.value * yyvsp[0].integer.value;
else
{
yyval.integer.value = yyvsp[-2].integer.value * yyvsp[0].integer.value;
if (yyvsp[-2].integer.value
&& (yyval.integer.value / yyvsp[-2].integer.value != yyvsp[0].integer.value
|| (yyval.integer.value & yyvsp[-2].integer.value & yyvsp[0].integer.value) < 0))
integer_overflow ();
} ;
break;}
case 13:
#line 198 "cexp.y"
{ if (yyvsp[0].integer.value == 0)
{
error ("division by zero in #if");
yyvsp[0].integer.value = 1;
}
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
if (yyval.integer.unsignedp)
yyval.integer.value = (unsigned long) yyvsp[-2].integer.value / yyvsp[0].integer.value;
else
{
yyval.integer.value = yyvsp[-2].integer.value / yyvsp[0].integer.value;
if ((yyval.integer.value & yyvsp[-2].integer.value & yyvsp[0].integer.value) < 0)
integer_overflow ();
} ;
break;}
case 14:
#line 213 "cexp.y"
{ if (yyvsp[0].integer.value == 0)
{
error ("division by zero in #if");
yyvsp[0].integer.value = 1;
}
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
if (yyval.integer.unsignedp)
yyval.integer.value = (unsigned long) yyvsp[-2].integer.value % yyvsp[0].integer.value;
else
yyval.integer.value = yyvsp[-2].integer.value % yyvsp[0].integer.value; ;
break;}
case 15:
#line 224 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value + yyvsp[0].integer.value;
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
if (! yyval.integer.unsignedp
&& ! possible_sum_sign (yyvsp[-2].integer.value, yyvsp[0].integer.value,
yyval.integer.value))
integer_overflow (); ;
break;}
case 16:
#line 231 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value - yyvsp[0].integer.value;
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp;
if (! yyval.integer.unsignedp
&& ! possible_sum_sign (yyval.integer.value, yyvsp[0].integer.value,
yyvsp[-2].integer.value))
integer_overflow (); ;
break;}
case 17:
#line 238 "cexp.y"
{ yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp;
if (yyvsp[0].integer.value < 0 && ! yyvsp[0].integer.unsignedp)
yyval.integer.value = right_shift (&yyvsp[-2].integer, -yyvsp[0].integer.value);
else
yyval.integer.value = left_shift (&yyvsp[-2].integer, yyvsp[0].integer.value); ;
break;}
case 18:
#line 244 "cexp.y"
{ yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp;
if (yyvsp[0].integer.value < 0 && ! yyvsp[0].integer.unsignedp)
yyval.integer.value = left_shift (&yyvsp[-2].integer, -yyvsp[0].integer.value);
else
yyval.integer.value = right_shift (&yyvsp[-2].integer, yyvsp[0].integer.value); ;
break;}
case 19:
#line 250 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value == yyvsp[0].integer.value);
yyval.integer.unsignedp = 0; ;
break;}
case 20:
#line 253 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value != yyvsp[0].integer.value);
yyval.integer.unsignedp = 0; ;
break;}
case 21:
#line 256 "cexp.y"
{ yyval.integer.unsignedp = 0;
if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
yyval.integer.value = (unsigned long) yyvsp[-2].integer.value <= yyvsp[0].integer.value;
else
yyval.integer.value = yyvsp[-2].integer.value <= yyvsp[0].integer.value; ;
break;}
case 22:
#line 262 "cexp.y"
{ yyval.integer.unsignedp = 0;
if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
yyval.integer.value = (unsigned long) yyvsp[-2].integer.value >= yyvsp[0].integer.value;
else
yyval.integer.value = yyvsp[-2].integer.value >= yyvsp[0].integer.value; ;
break;}
case 23:
#line 268 "cexp.y"
{ yyval.integer.unsignedp = 0;
if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
yyval.integer.value = (unsigned long) yyvsp[-2].integer.value < yyvsp[0].integer.value;
else
yyval.integer.value = yyvsp[-2].integer.value < yyvsp[0].integer.value; ;
break;}
case 24:
#line 274 "cexp.y"
{ yyval.integer.unsignedp = 0;
if (yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp)
yyval.integer.value = (unsigned long) yyvsp[-2].integer.value > yyvsp[0].integer.value;
else
yyval.integer.value = yyvsp[-2].integer.value > yyvsp[0].integer.value; ;
break;}
case 25:
#line 280 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value & yyvsp[0].integer.value;
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
break;}
case 26:
#line 283 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value ^ yyvsp[0].integer.value;
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
break;}
case 27:
#line 286 "cexp.y"
{ yyval.integer.value = yyvsp[-2].integer.value | yyvsp[0].integer.value;
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
break;}
case 28:
#line 289 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value && yyvsp[0].integer.value);
yyval.integer.unsignedp = 0; ;
break;}
case 29:
#line 292 "cexp.y"
{ yyval.integer.value = (yyvsp[-2].integer.value || yyvsp[0].integer.value);
yyval.integer.unsignedp = 0; ;
break;}
case 30:
#line 295 "cexp.y"
{ yyval.integer.value = yyvsp[-4].integer.value ? yyvsp[-2].integer.value : yyvsp[0].integer.value;
yyval.integer.unsignedp = yyvsp[-2].integer.unsignedp || yyvsp[0].integer.unsignedp; ;
break;}
case 31:
#line 298 "cexp.y"
{ yyval.integer = yylval.integer; ;
break;}
case 32:
#line 300 "cexp.y"
{ yyval.integer = yylval.integer; ;
break;}
case 33:
#line 302 "cexp.y"
{ yyval.integer.value = 0;
yyval.integer.unsignedp = 0; ;
break;}
case 34:
#line 307 "cexp.y"
{ yyval.keywords = 0; ;
break;}
case 35:
#line 309 "cexp.y"
{ struct arglist *temp;
yyval.keywords = (struct arglist *) xmalloc (sizeof (struct arglist));
yyval.keywords->next = yyvsp[-2].keywords;
yyval.keywords->name = (U_CHAR *) "(";
yyval.keywords->length = 1;
temp = yyval.keywords;
while (temp != 0 && temp->next != 0)
temp = temp->next;
temp->next = (struct arglist *) xmalloc (sizeof (struct arglist));
temp->next->next = yyvsp[0].keywords;
temp->next->name = (U_CHAR *) ")";
temp->next->length = 1; ;
break;}
case 36:
#line 322 "cexp.y"
{ yyval.keywords = (struct arglist *) xmalloc (sizeof (struct arglist));
yyval.keywords->name = yyvsp[-1].name.address;
yyval.keywords->length = yyvsp[-1].name.length;
yyval.keywords->next = yyvsp[0].keywords; ;
break;}
}
/* the action file gets copied in in place of this dollarsign */
#line 440 "bison.simple"
yyvsp -= yylen;
yyssp -= yylen;
#ifdef YYLSP_NEEDED
yylsp -= yylen;
#endif
#if YYDEBUG != 0
if (yydebug)
{
short *ssp1 = yyss - 1;
fprintf (stderr, "state stack now");
while (ssp1 != yyssp)
fprintf (stderr, " %d", *++ssp1);
fprintf (stderr, "\n");
}
#endif
*++yyvsp = yyval;
#ifdef YYLSP_NEEDED
yylsp++;
if (yylen == 0)
{
yylsp->first_line = yylloc.first_line;
yylsp->first_column = yylloc.first_column;
yylsp->last_line = (yylsp-1)->last_line;
yylsp->last_column = (yylsp-1)->last_column;
yylsp->text = 0;
}
else
{
yylsp->last_line = (yylsp+yylen-1)->last_line;
yylsp->last_column = (yylsp+yylen-1)->last_column;
}
#endif
/* Now "shift" the result of the reduction.
Determine what state that goes to,
based on the state we popped back to
and the rule number reduced by. */
yyn = yyr1[yyn];
yystate = yypgoto[yyn - YYNTBASE] + *yyssp;
if (yystate >= 0 && yystate <= YYLAST && yycheck[yystate] == *yyssp)
yystate = yytable[yystate];
else
yystate = yydefgoto[yyn - YYNTBASE];
goto yynewstate;
yyerrlab: /* here on detecting error */
if (! yyerrstatus)
/* If not already recovering from an error, report this error. */
{
++yynerrs;
#ifdef YYERROR_VERBOSE
yyn = yypact[yystate];
if (yyn > YYFLAG && yyn < YYLAST)
{
int size = 0;
char *msg;
int x, count;
count = 0;
for (x = 0; x < (sizeof(yytname) / sizeof(char *)); x++)
if (yycheck[x + yyn] == x)
size += strlen(yytname[x]) + 15, count++;
msg = (char *) malloc(size + 15);
if (msg != 0)
{
strcpy(msg, "parse error");
if (count < 5)
{
count = 0;
for (x = 0; x < (sizeof(yytname) / sizeof(char *)); x++)
if (yycheck[x + yyn] == x)
{
strcat(msg, count == 0 ? ", expecting `" : " or `");
strcat(msg, yytname[x]);
strcat(msg, "'");
count++;
}
}
yyerror(msg);
free(msg);
}
else
yyerror ("parse error; also virtual memory exceeded");
}
else
#endif /* YYERROR_VERBOSE */
yyerror("parse error");
}
yyerrlab1: /* here on error raised explicitly by an action */
if (yyerrstatus == 3)
{
/* if just tried and failed to reuse lookahead token after an error, discard it. */
/* return failure if at end of input */
if (yychar == YYEOF)
YYABORT;
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Discarding token %d (%s).\n", yychar, yytname[yychar1]);
#endif
yychar = YYEMPTY;
}
/* Else will try to reuse lookahead token
after shifting the error token. */
yyerrstatus = 3; /* Each real token shifted decrements this */
goto yyerrhandle;
yyerrdefault: /* current state does not do anything special for the error token. */
#if 0
/* This is wrong; only states that explicitly want error tokens
should shift them. */
yyn = yydefact[yystate]; /* If its default is to accept any token, ok. Otherwise pop it.*/
if (yyn) goto yydefault;
#endif
yyerrpop: /* pop the current state because it cannot handle the error token */
if (yyssp == yyss) YYABORT;
yyvsp--;
yystate = *--yyssp;
#ifdef YYLSP_NEEDED
yylsp--;
#endif
#if YYDEBUG != 0
if (yydebug)
{
short *ssp1 = yyss - 1;
fprintf (stderr, "Error: state stack now");
while (ssp1 != yyssp)
fprintf (stderr, " %d", *++ssp1);
fprintf (stderr, "\n");
}
#endif
yyerrhandle:
yyn = yypact[yystate];
if (yyn == YYFLAG)
goto yyerrdefault;
yyn += YYTERROR;
if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != YYTERROR)
goto yyerrdefault;
yyn = yytable[yyn];
if (yyn < 0)
{
if (yyn == YYFLAG)
goto yyerrpop;
yyn = -yyn;
goto yyreduce;
}
else if (yyn == 0)
goto yyerrpop;
if (yyn == YYFINAL)
YYACCEPT;
#if YYDEBUG != 0
if (yydebug)
fprintf(stderr, "Shifting error token, ");
#endif
*++yyvsp = yylval;
#ifdef YYLSP_NEEDED
*++yylsp = yylloc;
#endif
yystate = yyn;
goto yynewstate;
}
#line 327 "cexp.y"
/* 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 */
int
parse_number (olen)
int olen;
{
register char *p = lexptr;
register int c;
register unsigned long n = 0, nd, ULONG_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;
for (c = 0; c < len; c++)
if (p[c] == '.') {
/* It's a float since it contains a point. */
yyerror ("floating point numbers not allowed in #if expressions");
return ERROR;
}
yylval.integer.unsignedp = 0;
if (len >= 3 && (!strncmp (p, "0x", 2) || !strncmp (p, "0X", 2))) {
p += 2;
base = 16;
len -= 2;
}
else if (*p == '0')
base = 8;
ULONG_MAX_over_base = (unsigned long) -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 (spec_long)
yyerror ("two `l's in integer constant");
spec_long = 1;
}
else if (c == 'u' || c == 'U')
{
if (yylval.integer.unsignedp)
yyerror ("two `u's in integer constant");
yylval.integer.unsignedp = 1;
}
else
break;
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 |= ULONG_MAX_over_base < n | nd < n;
n = nd;
}
if (len != 0) {
yyerror ("Invalid number in #if expression");
return ERROR;
}
if (base <= largest_digit)
warning ("integer constant contains digits beyond the radix");
if (overflow)
warning ("integer constant out of range");
/* If too big to be signed, consider it unsigned. */
if ((long) n < 0 && ! yylval.integer.unsignedp)
{
if (base == 10)
warning ("integer constant is so large that it is unsigned");
yylval.integer.unsignedp = 1;
}
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. */
int
yylex ()
{
register int c;
register int namelen;
register char *tokstart;
register struct token *toktab;
int wide_flag;
retry:
tokstart = 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 0:
return 0;
case ' ':
case '\t':
case '\r':
case '\n':
lexptr++;
goto retry;
case 'L':
/* Capital L may start a wide-string or wide-character constant. */
if (lexptr[1] == '\'')
{
lexptr++;
wide_flag = 1;
goto char_constant;
}
if (lexptr[1] == '"')
{
lexptr++;
wide_flag = 1;
goto string_constant;
}
break;
case '\'':
wide_flag = 0;
char_constant:
lexptr++;
if (keyword_parsing) {
char *start_ptr = lexptr - 1;
while (1) {
c = *lexptr++;
if (c == '\\')
c = parse_escape (&lexptr);
else if (c == '\'')
break;
}
yylval.name.address = (U_CHAR *) 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 int result = 0;
register num_chars = 0;
unsigned width = CHAR_TYPE_SIZE;
int max_chars;
char *token_buffer;
if (wide_flag)
{
width = WCHAR_TYPE_SIZE;
#ifdef MULTIBYTE_CHARS
max_chars = MB_CUR_MAX;
#else
max_chars = 1;
#endif
}
else
max_chars = 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);
if (width < HOST_BITS_PER_INT
&& (unsigned) c >= (1 << width))
pedwarn ("escape sequence out of range for character");
}
num_chars++;
/* Merge character into result; ignore excess chars. */
if (num_chars < max_chars + 1)
{
if (width < HOST_BITS_PER_INT)
result = (result << width) | (c & ((1 << width) - 1));
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 ("__CHAR_UNSIGNED__", sizeof ("__CHAR_UNSIGNED__")-1, -1)
|| ((result >> (num_bits - 1)) & 1) == 0)
yylval.integer.value
= result & ((unsigned long) ~0 >> (HOST_BITS_PER_LONG - num_bits));
else
yylval.integer.value
= result | ~((unsigned long) ~0 >> (HOST_BITS_PER_LONG - 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
warning ("Ignoring invalid multibyte character");
}
#endif
yylval.integer.value = result;
}
}
/* This is always a signed type. */
yylval.integer.unsignedp = 0;
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 '"':
string_constant:
if (keyword_parsing) {
char *start_ptr = lexptr;
lexptr++;
while (1) {
c = *lexptr++;
if (c == '\\')
c = parse_escape (&lexptr);
else if (c == '"')
break;
}
yylval.name.address = (U_CHAR *) 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 = 0;
c = tokstart[namelen], is_idchar[c] || c == '.';
namelen++)
;
return parse_number (namelen);
}
/* It is a name. See how long it is. */
if (keyword_parsing) {
for (namelen = 0;; namelen++) {
if (is_hor_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 = (U_CHAR *) 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.
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. */
int
parse_escape (string_ptr)
char **string_ptr;
{
register int c = *(*string_ptr)++;
switch (c)
{
case 'a':
return TARGET_BELL;
case 'b':
return TARGET_BS;
case 'e':
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 '^':
c = *(*string_ptr)++;
if (c == '\\')
c = parse_escape (string_ptr);
if (c == '?')
return 0177;
return (c & 0200) | (c & 037);
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
{
register 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 & ~((1 << CHAR_TYPE_SIZE) - 1)) != 0)
{
i &= (1 << CHAR_TYPE_SIZE) - 1;
warning ("octal character constant does not fit in a byte");
}
return i;
}
case 'x':
{
register unsigned i = 0, overflow = 0, 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 & ~((1 << BITS_PER_UNIT) - 1)))
{
i &= (1 << BITS_PER_UNIT) - 1;
warning ("hex character constant does not fit in a byte");
}
return i;
}
default:
return c;
}
}
void
yyerror (s)
char *s;
{
error (s);
longjmp (parse_return_error, 1);
}
static void
integer_overflow ()
{
if (pedantic)
pedwarn ("integer overflow in preprocessor expression");
}
static long
left_shift (a, b)
struct constant *a;
unsigned long b;
{
if (b >= HOST_BITS_PER_LONG)
{
if (! a->unsignedp && a->value != 0)
integer_overflow ();
return 0;
}
else if (a->unsignedp)
return (unsigned long) a->value << b;
else
{
long l = a->value << b;
if (l >> b != a->value)
integer_overflow ();
return l;
}
}
static long
right_shift (a, b)
struct constant *a;
unsigned long b;
{
if (b >= HOST_BITS_PER_LONG)
return a->unsignedp ? 0 : a->value >> (HOST_BITS_PER_LONG - 1);
else if (a->unsignedp)
return (unsigned long) a->value >> b;
else
return 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. */
/* We do not support C comments. They should be removed before
this function is called. */
int
parse_c_expression (string)
char *string;
{
lexptr = string;
if (lexptr == 0 || *lexptr == 0) {
error ("empty #if expression");
return 0; /* don't include the #if group */
}
/* 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 ())
return 0; /* actually this is never reached
the way things stand. */
if (*lexptr)
error ("Junk after end of expression.");
return expression_value; /* set by yyparse () */
}
#ifdef TEST_EXP_READER
extern int yydebug;
/* Main program for testing purposes. */
int
main ()
{
int n, c;
char buf[1024];
/*
yydebug = 1;
*/
initialize_random_junk ();
for (;;) {
printf ("enter expression: ");
n = 0;
while ((buf[n] = getchar ()) != '\n' && buf[n] != EOF)
n++;
if (buf[n] == EOF)
break;
buf[n] = '\0';
printf ("parser returned %d\n", 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 space. isspace () thinks that
newline is space; this is not a good idea for this program. */
char is_hor_space[256];
/*
* initialize random junk in the hash table and maybe other places
*/
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['_'];
#if DOLLARS_IN_IDENTIFIERS
++is_idchar['$'];
++is_idstart['$'];
#endif
/* horizontal space table */
++is_hor_space[' '];
++is_hor_space['\t'];
}
error (msg)
{
printf ("error: %s\n", msg);
}
warning (msg)
{
printf ("warning: %s\n", msg);
}
struct hashnode *
lookup (name, len, hash)
char *name;
int len;
int hash;
{
return (DEFAULT_SIGNED_CHAR) ? 0 : ((struct hashnode *) -1);
}
#endif