/* A Bison parser, made from cexp.y with Bison version GNU Bison version 1.22 */ #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 27 "cexp.y" #include "config.h" #include /* #define YYDEBUG 1 */ #ifdef MULTIBYTE_CHARS #include #include #endif #include 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 /* Find the largest host integer type and set its size and type. */ #ifndef HOST_BITS_PER_WIDE_INT #if HOST_BITS_PER_LONG > HOST_BITS_PER_INT #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG #define HOST_WIDE_INT long #else #define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT #define HOST_WIDE_INT int #endif #endif #ifndef NULL_PTR #define NULL_PTR ((GENERIC_PTR)0) #endif int yylex (); void yyerror (); HOST_WIDE_INT expression_value; static jmp_buf parse_return_error; /* Nonzero means count most punctuation as part of a name. */ static int keyword_parsing = 0; /* Nonzero means do not evaluate this expression. This is a count, since unevaluated expressions can nest. */ static int skip_evaluation; /* 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 #ifndef MAX_CHAR_TYPE_SIZE #define MAX_CHAR_TYPE_SIZE CHAR_TYPE_SIZE #endif #ifndef MAX_INT_TYPE_SIZE #define MAX_INT_TYPE_SIZE INT_TYPE_SIZE #endif #ifndef MAX_LONG_TYPE_SIZE #define MAX_LONG_TYPE_SIZE LONG_TYPE_SIZE #endif #ifndef MAX_WCHAR_TYPE_SIZE #define MAX_WCHAR_TYPE_SIZE WCHAR_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 146 "cexp.y" typedef union { struct constant {long value; int unsignedp;} integer; struct name {U_CHAR *address; int length;} name; struct arglist *keywords; } 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 #ifndef __cplusplus #ifndef __STDC__ #define const #endif #endif #define YYFINAL 77 #define YYFLAG -32768 #define YYNTBASE 34 #define YYTRANSLATE(x) ((unsigned)(x) <= 270 ? yytranslate[x] : 43) 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 }; #if YYDEBUG != 0 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, 100, 105, 106, 111, 112, 113, 121, 123, 125, 127, 128, 133 }; 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, 42, 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, 0, 36, 11, 38, 36, 0, 0, 36, 10, 39, 36, 0, 0, 0, 36, 7, 40, 36, 8, 41, 36, 0, 3, 0, 4, 0, 5, 0, 0, 32, 42, 33, 42, 0, 5, 42, 0 }; #endif #if YYDEBUG != 0 static const short yyrline[] = { 0, 176, 181, 182, 189, 194, 197, 199, 202, 206, 208, 213, 218, 230, 246, 258, 265, 272, 278, 284, 287, 290, 296, 302, 308, 314, 317, 320, 323, 326, 329, 332, 335, 337, 340, 343, 345, 347, 352, 354, 367 }; static const char * const yytname[] = { "$","error","$illegal.","INT","CHAR", "NAME","ERROR","'?'","':'","','","OR","AND","'|'","'^'","'&'","EQUAL","NOTEQUAL", "'<'","'>'","LEQ","GEQ","LSH","RSH","'+'","'-'","'*'","'/'","'%'","UNARY","'!'", "'~'","'#'","'('","')'","start","exp1","exp","@1","@2","@3","@4","@5","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, 38, 36, 39, 36, 40, 41, 36, 36, 36, 36, 42, 42, 42 }; 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, 0, 4, 0, 4, 0, 0, 7, 1, 1, 1, 0, 4, 2 }; static const short yydefact[] = { 0, 35, 36, 37, 0, 0, 0, 0, 0, 0, 1, 2, 6, 4, 5, 7, 8, 0, 0, 32, 30, 28, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 3, 0, 0, 0, 27, 26, 25, 19, 20, 23, 24, 21, 22, 17, 18, 15, 16, 12, 13, 14, 38, 0, 31, 29, 38, 38, 0, 33, 40, 0, 10, 0, 38, 34, 39, 0, 0, 0 }; static const short yydefgoto[] = { 75, 10, 11, 38, 43, 42, 41, 71, 66 }; static const short yypact[] = { 12, -32768,-32768,-32768, 12, 12, 12, 12, 1, 12, 4, 79,-32768,-32768,-32768,-32768, -21, 31, 12,-32768,-32768, -32768, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 30,-32768, 79, 12, 12, 12, 110, 124, 137, 148, 148, 155, 155, 155, 155, 160, 160, -17, -17,-32768,-32768,-32768, 2, 58, 34, 95, 2, 2, 54,-32768,-32768, 55,-32768, 12, 2, 79,-32768, 63, 188,-32768 }; static const short yypgoto[] = {-32768, 180, -4,-32768,-32768,-32768,-32768,-32768, -60 }; #define YYLAST 189 static const short yytable[] = { 12, 13, 14, 15, 68, 69, 16, 64, 35, 36, 37, -9, 74, 18, 40, 1, 2, 3, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 65, 4, 5, 61, 62, 63, 18, 6, 7, 8, 9, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 60, 76, 39, 19, 67, 73, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 19, 70, 72, 20, 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, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 31, 32, 33, 34, 35, 36, 37, 33, 34, 35, 36, 37, 77, 17 }; static const short yycheck[] = { 4, 5, 6, 7, 64, 65, 5, 5, 25, 26, 27, 32, 72, 9, 18, 3, 4, 5, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 32, 23, 24, 41, 42, 43, 9, 29, 30, 31, 32, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 32, 0, 33, 7, 8, 71, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 7, 33, 33, 10, 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, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 21, 22, 23, 24, 25, 26, 27, 23, 24, 25, 26, 27, 0, 9 }; /* -*-C-*- Note some compilers choke on comments on `#line' lines. */ #line 3 "/usr/local/lib/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__) || defined (__sparc) || defined (__sgi) #include #else /* not sparc */ #if defined (MSDOS) && !defined (__TURBOC__) #include #else /* not MSDOS, or __TURBOC__ */ #if defined(_AIX) #include #pragma alloca #else /* not MSDOS, __TURBOC__, or _AIX */ #ifdef __hpux #ifdef __cplusplus extern "C" { void *alloca (unsigned int); }; #else /* not __cplusplus */ void *alloca (); #endif /* not __cplusplus */ #endif /* __hpux */ #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 /* Prevent warning if -Wstrict-prototypes. */ #ifdef __GNUC__ int yyparse (void); #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 184 "/usr/local/lib/bison.simple" /* The user can define YYPARSE_PARAM as the name of an argument to be passed into yyparse. The argument should have type void *. It should actually point to an object. Grammar actions can access the variable by casting it to the proper pointer type. */ #ifdef YYPARSE_PARAM #define YYPARSE_PARAM_DECL void *YYPARSE_PARAM; #else #define YYPARSE_PARAM #define YYPARSE_PARAM_DECL #endif int yyparse(YYPARSE_PARAM) YYPARSE_PARAM_DECL { 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 = 0; /* 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. The wasted elements are never initialized. */ 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. */ #ifdef YYLSP_NEEDED /* This used to be a conditional around just the two extra args, but that might be undefined if yyoverflow is a macro. */ yyoverflow("parser stack overflow", &yyss1, size * sizeof (*yyssp), &yyvs1, size * sizeof (*yyvsp), &yyls1, size * sizeof (*yylsp), &yystacksize); #else yyoverflow("parser stack overflow", &yyss1, size * sizeof (*yyssp), &yyvs1, size * sizeof (*yyvsp), &yystacksize); #endif 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 goto yybackup; 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]; if (yylen > 0) 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 symbols 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 177 "cexp.y" { expression_value = yyvsp[0].integer.value; ; break;} case 3: #line 183 "cexp.y" { if (pedantic) pedwarn ("comma operator in operand of `#if'"); yyval.integer = yyvsp[0].integer; ; break;} case 4: #line 190 "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 195 "cexp.y" { yyval.integer.value = ! yyvsp[0].integer.value; yyval.integer.unsignedp = 0; ; break;} case 6: #line 198 "cexp.y" { yyval.integer = yyvsp[0].integer; ; break;} case 7: #line 200 "cexp.y" { yyval.integer.value = ~ yyvsp[0].integer.value; yyval.integer.unsignedp = yyvsp[0].integer.unsignedp; ; break;} case 8: #line 203 "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 207 "cexp.y" { keyword_parsing = 1; ; break;} case 10: #line 209 "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 214 "cexp.y" { yyval.integer = yyvsp[-1].integer; ; break;} case 12: #line 219 "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 231 "cexp.y" { if (yyvsp[0].integer.value == 0) { if (!skip_evaluation) 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 247 "cexp.y" { if (yyvsp[0].integer.value == 0) { if (!skip_evaluation) 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 259 "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 266 "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 273 "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 279 "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 285 "cexp.y" { yyval.integer.value = (yyvsp[-2].integer.value == yyvsp[0].integer.value); yyval.integer.unsignedp = 0; ; break;} case 20: #line 288 "cexp.y" { yyval.integer.value = (yyvsp[-2].integer.value != yyvsp[0].integer.value); yyval.integer.unsignedp = 0; ; break;} case 21: #line 291 "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 297 "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 303 "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 309 "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 315 "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 318 "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 321 "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 324 "cexp.y" { skip_evaluation += !yyvsp[-1].integer.value; ; break;} case 29: #line 326 "cexp.y" { skip_evaluation -= !yyvsp[-3].integer.value; yyval.integer.value = (yyvsp[-3].integer.value && yyvsp[0].integer.value); yyval.integer.unsignedp = 0; ; break;} case 30: #line 330 "cexp.y" { skip_evaluation += !!yyvsp[-1].integer.value; ; break;} case 31: #line 332 "cexp.y" { skip_evaluation -= !!yyvsp[-3].integer.value; yyval.integer.value = (yyvsp[-3].integer.value || yyvsp[0].integer.value); yyval.integer.unsignedp = 0; ; break;} case 32: #line 336 "cexp.y" { skip_evaluation += !yyvsp[-1].integer.value; ; break;} case 33: #line 338 "cexp.y" { skip_evaluation += !!yyvsp[-4].integer.value - !yyvsp[-4].integer.value; ; break;} case 34: #line 340 "cexp.y" { skip_evaluation -= !!yyvsp[-6].integer.value; yyval.integer.value = yyvsp[-6].integer.value ? yyvsp[-3].integer.value : yyvsp[0].integer.value; yyval.integer.unsignedp = yyvsp[-3].integer.unsignedp || yyvsp[0].integer.unsignedp; ; break;} case 35: #line 344 "cexp.y" { yyval.integer = yylval.integer; ; break;} case 36: #line 346 "cexp.y" { yyval.integer = yylval.integer; ; break;} case 37: #line 348 "cexp.y" { yyval.integer.value = 0; yyval.integer.unsignedp = 0; ; break;} case 38: #line 353 "cexp.y" { yyval.keywords = 0; ; break;} case 39: #line 355 "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 40: #line 368 "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 480 "/usr/local/lib/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; /* Start X at -yyn if nec to avoid negative indexes in yycheck. */ for (x = (yyn < 0 ? -yyn : 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 = (yyn < 0 ? -yyn : 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"); } goto yyerrlab1; 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 373 "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 unsigned char *tokstart; register struct token *toktab; int wide_flag; 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 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 = 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 = 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); 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 = 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 = 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': 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 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 << MAX_CHAR_TYPE_SIZE) - 1)) != 0) { i &= (1 << MAX_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); skip_evaluation = 0; longjmp (parse_return_error, 1); } static void integer_overflow () { if (!skip_evaluation && pedantic) pedwarn ("integer overflow in preprocessor expression"); } static long left_shift (a, b) struct constant *a; unsigned long 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_LONG) return 0; else if (a->unsignedp) return (unsigned long) a->value << b; else return a->value << b; } 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. */ HOST_WIDE_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 %ld\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