📄 parse.cpp
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/* A Bison parser, made from string.y with Bison version GNU Bison version 1.24
*/
#define YYBISON 1 /* Identify Bison output. */
#define ERROR_TOKEN 258
#define IF 259
#define ELSE 260
#define PRINT 261
#define INPUT 262
#define ASSIGN 263
#define EQUAL 264
#define CONCAT 265
#define END_STMT 266
#define OPEN_PAR 267
#define CLOSE_PAR 268
#define BEGIN_CS 269
#define END_CS 270
#define ID 271
#define STRING 272
#line 3 "string.y"
/* ------------------------------------------------------------------
Initial code (copied verbatim to the output file)
------------------------------------------------------------------ */
// Includes
#include <malloc.h> // _alloca is used by the parser
#include <string.h> // strcpy
#include "lex.h" // the lexer
#include "symtab.h" // the symbol table
#include "synttree.h" // the syntax tree
SymTab st; // create the symbol table
SyntTree tree; // the syntax tree
// Some yacc (bison) defines
#define YYDEBUG 1 // Generate debug code; needed for YYERROR_VERBOSE
#define YYERROR_VERBOSE // Give a more specific parse error message
// Error-reporting function must be defined by the caller
void Error (char *format, ...);
// Forward references
void yyerror (char *msg);
char *MakeName ();
#line 38 "string.y"
typedef union {
char *str; // a character string
SymDesc *symbol; // entry from symbol table
TreeNode *tnode; // node in the syntax tree
} 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 __cplusplus
#ifndef __STDC__
#define const
#endif
#endif
#define YYFINAL 47
#define YYFLAG -32768
#define YYNTBASE 18
#define YYTRANSLATE(x) ((unsigned)(x) <= 272 ? yytranslate[x] : 31)
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, 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, 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, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17
};
#if YYDEBUG != 0
static const short yyprhs[] = { 0,
0, 2, 5, 6, 8, 11, 15, 19, 21, 23,
26, 33, 36, 37, 41, 43, 47, 49, 53, 55,
59, 61, 63, 65, 69, 71
};
static const short yyrhs[] = { 19,
0, 19, 20, 0, 0, 11, 0, 24, 11, 0,
6, 24, 11, 0, 7, 29, 11, 0, 21, 0,
23, 0, 1, 11, 0, 4, 12, 24, 13, 20,
22, 0, 5, 20, 0, 0, 14, 19, 15, 0,
25, 0, 24, 9, 26, 0, 26, 0, 29, 8,
26, 0, 27, 0, 27, 10, 28, 0, 28, 0,
29, 0, 30, 0, 12, 24, 13, 0, 16, 0,
17, 0
};
#endif
#if YYDEBUG != 0
static const short yyrline[] = { 0,
66, 70, 71, 75, 76, 77, 78, 79, 80, 81,
87, 97, 98, 102, 106, 110, 111, 115, 116, 120,
121, 125, 126, 127, 131, 142
};
static const char * const yytname[] = { "$","error","$undefined.","ERROR_TOKEN",
"IF","ELSE","PRINT","INPUT","ASSIGN","EQUAL","CONCAT","END_STMT","OPEN_PAR",
"CLOSE_PAR","BEGIN_CS","END_CS","ID","STRING","program","statement_list","statement",
"if_statement","optional_else_statement","compound_statement","expression","equal_expression",
"assign_expression","concat_expression","simple_expression","identifier","string",
""
};
#endif
static const short yyr1[] = { 0,
18, 19, 19, 20, 20, 20, 20, 20, 20, 20,
21, 22, 22, 23, 24, 25, 25, 26, 26, 27,
27, 28, 28, 28, 29, 30
};
static const short yyr2[] = { 0,
1, 2, 0, 1, 2, 3, 3, 1, 1, 2,
6, 2, 0, 3, 1, 3, 1, 3, 1, 3,
1, 1, 1, 3, 1, 1
};
static const short yydefact[] = { 3,
0, 0, 0, 0, 0, 4, 0, 3, 25, 26,
2, 8, 9, 0, 15, 17, 19, 21, 22, 23,
10, 0, 0, 0, 0, 0, 0, 5, 0, 0,
0, 6, 7, 24, 14, 16, 20, 22, 18, 0,
13, 0, 11, 12, 0, 0, 0
};
static const short yydefgoto[] = { 45,
1, 11, 12, 43, 13, 14, 15, 16, 17, 18,
19, 20
};
static const short yypact[] = {-32768,
6, -9, 2, -1, -13,-32768, -1,-32768,-32768,-32768,
-32768,-32768,-32768, 35,-32768,-32768, -2,-32768, 13,-32768,
-32768, -1, 40, 15, -4, 24, -1,-32768, -1, -1,
20,-32768,-32768,-32768,-32768,-32768,-32768,-32768,-32768, 41,
22, 41,-32768,-32768, 32, 43,-32768
};
static const short yypgoto[] = {-32768,
42, 14,-32768,-32768,-32768, -3,-32768, 7,-32768, 30,
-5,-32768
};
#define YYLAST 59
static const short yytable[] = { 24,
23, 21, 9, 25, 27, -1, 2, 29, 34, 3,
7, 4, 5, 22, 9, 10, 6, 7, 31, 8,
30, 9, 10, 38, 2, 33, 42, 3, 27, 4,
5, 46, 40, 36, 6, 7, 39, 8, 35, 9,
10, 2, 47, 27, 3, 28, 4, 5, 27, 26,
32, 6, 7, 41, 8, 44, 9, 10, 37
};
static const short yycheck[] = { 5,
4, 11, 16, 7, 9, 0, 1, 10, 13, 4,
12, 6, 7, 12, 16, 17, 11, 12, 22, 14,
8, 16, 17, 29, 1, 11, 5, 4, 9, 6,
7, 0, 13, 27, 11, 12, 30, 14, 15, 16,
17, 1, 0, 9, 4, 11, 6, 7, 9, 8,
11, 11, 12, 40, 14, 42, 16, 17, 29
};
/* -*-C-*- Note some compilers choke on comments on `#line' lines. */
#line 3 "bison.simple"
/* Skeleton output parser for bison,
Copyright (C) 1984, 1989, 1990 Free Software Foundation, Inc.
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 2, 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. */
/* As a special exception, when this file is copied by Bison into a
Bison output file, you may use that output file without restriction.
This special exception was added by the Free Software Foundation
in version 1.24 of Bison. */
#ifndef alloca
#ifdef __GNUC__
#define alloca __builtin_alloca
#else /* not GNU C. */
#if (!defined (__STDC__) && defined (sparc)) || defined (__sparc__) || defined (__sparc) || defined (__sgi)
#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
#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
#ifdef YYLEX_PARAM
#define YYLEX yylex(&yylval, &yylloc, YYLEX_PARAM)
#else
#define YYLEX yylex(&yylval, &yylloc)
#endif
#else /* not YYLSP_NEEDED */
#ifdef YYLEX_PARAM
#define YYLEX yylex(&yylval, YYLEX_PARAM)
#else
#define YYLEX yylex(&yylval)
#endif
#endif /* not YYLSP_NEEDED */
#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_memcpy(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_memcpy (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_memcpy (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 192 "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;
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