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https://git.code.sf.net/p/quake/quakeforge
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4336fc2c73
As they are never referenced directly by instructions, there's no need for them to be in the near data space, taking precious def locations.
469 lines
9.2 KiB
Text
469 lines
9.2 KiB
Text
%{
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/*
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qp-parse.y
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parser for quakepascal
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Copyright (C) 2011 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2011/01/06
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] = "$Id$";
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "QF/dstring.h"
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#include "codespace.h"
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#include "diagnostic.h"
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#include "expr.h"
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#include "function.h"
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#include "qfcc.h"
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#include "reloc.h"
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#include "symtab.h"
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#include "type.h"
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#define YYDEBUG 1
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#define YYERROR_VERBOSE 1
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#undef YYERROR_VERBOSE
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extern char *yytext;
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static void
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yyerror (const char *s)
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{
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#ifdef YYERROR_VERBOSE
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error (0, "%s %s\n", yytext, s);
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#else
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error (0, "%s before %s", s, yytext);
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#endif
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}
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static void
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parse_error (void)
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{
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error (0, "parse error before %s", yytext);
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}
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#define PARSE_ERROR do { parse_error (); YYERROR; } while (0)
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int yylex (void);
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%}
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%union {
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int op;
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struct def_s *def;
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struct hashtab_s *def_list;
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struct type_s *type;
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struct typedef_s *typename;
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struct expr_s *expr;
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struct function_s *function;
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struct switch_block_s *switch_block;
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struct param_s *param;
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struct struct_s *strct;
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struct symtab_s *symtab;
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struct symbol_s *symbol;
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int storage;
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}
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// these tokens are common with qc
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%nonassoc IFX
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%nonassoc ELSE
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%nonassoc BREAK_PRIMARY
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%nonassoc ';'
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%nonassoc CLASS_NOT_CATEGORY
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%nonassoc STORAGEX
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%right <op> '=' ASX PAS /* pointer assign */
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%right '?' ':'
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%left OR
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%left AND
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%left '|'
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%left '^'
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%left '&'
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%left EQ NE
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%left LE GE LT GT
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// end of tokens common with qc
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%left <op> RELOP
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%left <op> ADDOP
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%left <op> MULOP
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%right UNARY
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%token <type> TYPE TYPE_NAME
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%token <symbol> ID
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%token <expr> CONST
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%token PROGRAM VAR ARRAY OF FUNCTION PROCEDURE PBEGIN END IF THEN ELSE
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%token WHILE DO RANGE ASSIGNOP NOT ELLIPSIS
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%token RETURN
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%type <type> type standard_type
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%type <symbol> program_head identifier_list subprogram_head
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%type <symtab> param_scope
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%type <param> arguments parameter_list
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%type <expr> compound_statement optional_statements statement_list
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%type <expr> statement procedure_statement
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%type <expr> expression_list expression unary_expr primary variable name
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%type <op> sign
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%{
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symtab_t *current_symtab;
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storage_class_t current_storage = st_global;
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function_t *current_func;
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struct class_type_s *current_class;
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expr_t *local_expr;
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param_t *current_params;
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/* When defining a new symbol, already existing symbols must be in a
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different scope. However, when they are in a different scope, we want a
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truly new symbol.
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*/
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static symbol_t *
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check_redefined (symbol_t *sym)
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{
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if (sym->table == current_symtab)
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error (0, "%s redefined", sym->name);
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if (sym->table) // truly new symbols are not in any symbol table
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sym = new_symbol (sym->name);
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return sym;
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}
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%}
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%%
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program
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: program_head
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declarations
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subprogram_declarations
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compound_statement '.'
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{
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symtab_t *st = current_symtab;
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// move the symbol for the program name to the end of the list
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symtab_removesymbol (current_symtab, $1);
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symtab_addsymbol (current_symtab, $1);
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current_func = begin_function ($1, 0, current_symtab, 0);
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current_symtab = current_func->symtab;
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build_code_function ($1, 0, $4);
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current_symtab = st;
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$4 = function_expr (new_symbol_expr ($1), 0);
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$1 = new_symbol (".main");
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$1->params = 0;
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$1->type = parse_params (&type_void, 0);
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$1 = function_symbol ($1, 0, 1);
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current_func = begin_function ($1, 0, current_symtab, 0);
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current_symtab = current_func->symtab;
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build_code_function ($1, 0, $4);
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current_symtab = st;
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}
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;
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program_head
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: PROGRAM { current_symtab = pr.symtab; }
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ID '(' opt_identifier_list ')' ';'
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{
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$$ = $3;
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$$->type = parse_params (&type_void, 0);
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$$ = function_symbol ($$, 0, 1);
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}
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;
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opt_identifier_list
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: /* empty */
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| identifier_list
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;
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identifier_list
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: ID { $$ = check_redefined ($1); }
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| identifier_list ',' ID
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{
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symbol_t **s;
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$$ = $1;
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$3 = check_redefined ($3);
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for (s = &$$; *s; s = &(*s)->next)
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;
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*s = $3;
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}
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;
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declarations
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: declarations VAR identifier_list ':' type ';'
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{
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while ($3) {
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symbol_t *next = $3->next;
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initialize_def ($3, $5, 0, current_symtab->space,
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current_storage);
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$3 = next;
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}
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}
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| /* empty */
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;
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type
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: standard_type
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| ARRAY '[' CONST RANGE CONST ']' OF standard_type
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{
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$$ = based_array_type ($8, expr_integer ($3), expr_integer ($5));
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}
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;
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standard_type
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: TYPE
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| TYPE_NAME
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;
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subprogram_declarations
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: subprogram_declarations subprogram_declaration
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| /* emtpy */
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;
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subprogram_declaration
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: subprogram_head ';'
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{
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$<storage>$ = current_storage;
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current_storage = st_local;
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current_func = begin_function ($1, 0, current_symtab, 0);
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current_symtab = current_func->symtab;
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}
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declarations compound_statement ';'
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{
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build_code_function ($1, 0, $5);
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current_symtab = current_symtab->parent;
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current_storage = $<storage>3;
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}
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| subprogram_head ASSIGNOP '#' CONST ';'
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{
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build_builtin_function ($1, $4, 0);
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}
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;
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subprogram_head
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: FUNCTION ID arguments ':' standard_type
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{
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$$ = $2;
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if ($$->table == current_symtab) {
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error (0, "%s redefined", $$->name);
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} else {
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$$->params = $3;
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$$->type = parse_params ($5, $3);
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$$ = function_symbol ($$, 0, 1);
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}
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}
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| PROCEDURE ID arguments
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{
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$$ = $2;
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if ($$->table == current_symtab) {
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error (0, "%s redefined", $$->name);
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} else {
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$$->params = $3;
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$$->type = parse_params (&type_void, $3);
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$$ = function_symbol ($$, 0, 1);
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}
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}
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;
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arguments
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: '(' param_scope parameter_list ')'
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{
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$$ = $3;
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current_symtab = $2;
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}
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| '(' param_scope parameter_list ';' ELLIPSIS ')'
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{
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$$ = param_append_identifiers ($3, 0, 0);
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current_symtab = $2;
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}
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| '(' ELLIPSIS ')' { $$ = new_param (0, 0, 0); }
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| /* emtpy */ { $$ = 0; }
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;
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param_scope
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: /* empty */
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{
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$$ = current_symtab;
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current_symtab = new_symtab (current_symtab, stab_local);
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}
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;
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parameter_list
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: identifier_list ':' type
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{
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$$ = param_append_identifiers (0, $1, $3);
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}
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| parameter_list ';' identifier_list ':' type
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{
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$$ = param_append_identifiers ($1, $3, $5);
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}
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;
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compound_statement
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: PBEGIN optional_statements END { $$ = $2; }
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;
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optional_statements
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: statement_list opt_semi
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| /* emtpy */ { $$ = 0; }
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;
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opt_semi
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: ';'
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| /* empty */
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;
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statement_list
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: statement
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{
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$$ = new_block_expr ();
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append_expr ($$, $1);
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}
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| statement_list ';' statement
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{
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$$ = $1;
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append_expr ($$, $3);
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}
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;
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statement
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: variable ASSIGNOP expression
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{
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$$ = $1;
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if ($$->type == ex_symbol && extract_type ($$) == ev_func)
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$$ = new_ret_expr ($$->e.symbol->type->t.func.type);
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$$ = assign_expr ($$, $3);
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}
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| procedure_statement
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| compound_statement
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| IF expression THEN statement ELSE statement
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{
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$$ = build_if_statement ($2, $4, $6);
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}
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| IF expression THEN statement %prec IFX
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{
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$$ = build_if_statement ($2, $4, 0);
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}
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| WHILE expression DO statement
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{
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$$ = build_while_statement ($2, $4,
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new_label_expr (),
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new_label_expr ());
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}
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| RETURN
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{
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$$ = return_expr (current_func, 0);
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}
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;
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variable
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: name
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| name '[' expression ']' { $$ = array_expr ($1, $3); }
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;
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procedure_statement
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: name { $$ = function_expr ($1, 0); }
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| name '(' expression_list ')' { $$ = function_expr ($1, $3); }
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;
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expression_list
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: expression
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| expression_list ',' expression
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{
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$$ = $3;
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$$->next = $1;
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}
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;
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unary_expr
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: primary
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| sign unary_expr %prec UNARY { $$ = unary_expr ($1, $2); }
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| NOT expression %prec UNARY { $$ = unary_expr ('!', $2); }
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;
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primary
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: variable
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{
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$$ = $1;
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if ($$->type == ex_symbol && extract_type ($$) == ev_func)
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$$ = function_expr ($$, 0);
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}
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| CONST
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| name '(' expression_list ')' { $$ = function_expr ($1, $3); }
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| '(' expression ')' { $$ = $2; }
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;
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expression
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: unary_expr
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| expression RELOP expression { $$ = binary_expr ($2, $1, $3); }
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| expression ADDOP expression
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{
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if ($2 == 'o')
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$$ = bool_expr (OR, new_label_expr (), $1, $3);
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else
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$$ = binary_expr ($2, $1, $3);
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}
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| expression MULOP expression
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{
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if ($2 == 'd')
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$2 = '/';
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else if ($2 == 'm')
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$2 = '%';
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if ($2 == 'a')
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$$ = bool_expr (AND, new_label_expr (), $1, $3);
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else
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$$ = binary_expr ($2, $1, $3);
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}
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;
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sign
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: ADDOP
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{
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if ($$ == 'o')
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PARSE_ERROR;
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}
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;
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name
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: ID
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{
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if (!$1->table) {
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error (0, "%s undefined", $1->name);
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$1->type = &type_integer;
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symtab_addsymbol (current_symtab, $1);
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}
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$$ = new_symbol_expr ($1);
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}
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;
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%%
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