449 lines
11 KiB
Plaintext
449 lines
11 KiB
Plaintext
%{
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/* sbc.y: A POSIX bc processor written for minix with no extensions. */
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/* This file is part of GNU bc.
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Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License , or
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(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. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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The Free Software Foundation, Inc.
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59 Temple Place, Suite 330
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Boston, MA 02111 USA
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You may contact the author by:
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e-mail: philnelson@acm.org
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us-mail: Philip A. Nelson
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Computer Science Department, 9062
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Western Washington University
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Bellingham, WA 98226-9062
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*************************************************************************/
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#include "bcdefs.h"
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#include "global.h" /* To get the global variables. */
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#include "proto.h"
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%}
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%start program
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%union {
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char *s_value;
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char c_value;
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int i_value;
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arg_list *a_value;
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}
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%token <i_value> ENDOFLINE AND OR NOT
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%token <s_value> STRING NAME NUMBER
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/* '-', '+' are tokens themselves */
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%token <c_value> ASSIGN_OP
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/* '=', '+=', '-=', '*=', '/=', '%=', '^=' */
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%token <s_value> REL_OP
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/* '==', '<=', '>=', '!=', '<', '>' */
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%token <c_value> INCR_DECR
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/* '++', '--' */
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%token <i_value> Define Break Quit Length
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/* 'define', 'break', 'quit', 'length' */
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%token <i_value> Return For If While Sqrt Else
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/* 'return', 'for', 'if', 'while', 'sqrt', 'else' */
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%token <i_value> Scale Ibase Obase Auto Read
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/* 'scale', 'ibase', 'obase', 'auto', 'read' */
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%token <i_value> Warranty, Halt, Last, Continue, Print, Limits
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/* 'warranty', 'halt', 'last', 'continue', 'print', 'limits' */
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/* The types of all other non-terminals. */
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%type <i_value> expression named_expression return_expression
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%type <a_value> opt_parameter_list parameter_list opt_auto_define_list
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%type <a_value> define_list opt_argument_list argument_list
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%type <i_value> program input_item semicolon_list statement_list
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%type <i_value> statement_or_error statement function relational_expression
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/* precedence */
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%nonassoc REL_OP
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%right ASSIGN_OP
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%left '+' '-'
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%left '*' '/' '%'
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%right '^'
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%nonassoc UNARY_MINUS
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%nonassoc INCR_DECR
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%%
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program : /* empty */
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{
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$$ = 0;
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std_only = TRUE;
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if (interactive)
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{
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printf ("s%s\n", BC_VERSION);
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welcome();
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}
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}
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| program input_item
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;
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input_item : semicolon_list ENDOFLINE
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{ run_code(); }
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| function
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{ run_code(); }
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| error ENDOFLINE
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{
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yyerrok;
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init_gen() ;
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}
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;
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semicolon_list : /* empty */
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{ $$ = 0; }
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| statement_or_error
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| semicolon_list ';' statement_or_error
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| semicolon_list ';'
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;
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statement_list : /* empty */
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{ $$ = 0; }
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| statement
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| statement_list ENDOFLINE
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| statement_list ENDOFLINE statement
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| statement_list ';'
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| statement_list ';' statement
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;
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statement_or_error : statement
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| error statement
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{ $$ = $2; }
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;
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statement : Warranty
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{ warranty("s"); }
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| expression
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{
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if ($1 & 1)
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generate ("W");
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else
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generate ("p");
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}
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| STRING
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{
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$$ = 0;
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generate ("w");
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generate ($1);
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free ($1);
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}
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| Break
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{
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if (break_label == 0)
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yyerror ("Break outside a for/while");
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else
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{
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sprintf (genstr, "J%1d:", break_label);
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generate (genstr);
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}
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}
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| Quit
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{ exit(0); }
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| Return
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{ generate ("0R"); }
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| Return '(' return_expression ')'
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{ generate ("R"); }
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| For
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{
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$1 = break_label;
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break_label = next_label++;
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}
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'(' expression ';'
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{
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$4 = next_label++;
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sprintf (genstr, "pN%1d:", $4);
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generate (genstr);
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}
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relational_expression ';'
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{
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$7 = next_label++;
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sprintf (genstr, "B%1d:J%1d:", $7, break_label);
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generate (genstr);
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$<i_value>$ = next_label++;
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sprintf (genstr, "N%1d:", $<i_value>$);
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generate (genstr);
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}
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expression ')'
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{
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sprintf (genstr, "pJ%1d:N%1d:", $4, $7);
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generate (genstr);
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}
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statement
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{
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sprintf (genstr, "J%1d:N%1d:", $<i_value>9,
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break_label);
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generate (genstr);
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break_label = $1;
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}
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| If '(' relational_expression ')'
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{
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$3 = next_label++;
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sprintf (genstr, "Z%1d:", $3);
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generate (genstr);
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}
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statement
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{
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sprintf (genstr, "N%1d:", $3);
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generate (genstr);
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}
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| While
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{
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$1 = next_label++;
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sprintf (genstr, "N%1d:", $1);
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generate (genstr);
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}
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'(' relational_expression
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{
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$4 = break_label;
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break_label = next_label++;
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sprintf (genstr, "Z%1d:", break_label);
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generate (genstr);
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}
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')' statement
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{
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sprintf (genstr, "J%1d:N%1d:", $1, break_label);
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generate (genstr);
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break_label = $4;
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}
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| '{' statement_list '}'
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{ $$ = 0; }
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;
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function : Define NAME '(' opt_parameter_list ')' '{'
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ENDOFLINE opt_auto_define_list
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{
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check_params ($4,$8);
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sprintf (genstr, "F%d,%s.%s[", lookup($2,FUNCT),
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arg_str ($4), arg_str ($8));
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generate (genstr);
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free_args ($4);
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free_args ($8);
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$1 = next_label;
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next_label = 0;
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}
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statement_list ENDOFLINE '}'
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{
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generate ("0R]");
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next_label = $1;
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}
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;
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opt_parameter_list : /* empty */
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{ $$ = NULL; }
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| parameter_list
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;
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parameter_list : NAME
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{ $$ = nextarg (NULL, lookup($1,SIMPLE), FALSE); }
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| define_list ',' NAME
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{ $$ = nextarg ($1, lookup($3,SIMPLE), FALSE); }
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;
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opt_auto_define_list : /* empty */
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{ $$ = NULL; }
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| Auto define_list ENDOFLINE
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{ $$ = $2; }
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| Auto define_list ';'
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{ $$ = $2; }
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;
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define_list : NAME
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{ $$ = nextarg (NULL, lookup($1,SIMPLE), FALSE); }
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| NAME '[' ']'
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{ $$ = nextarg (NULL, lookup($1,ARRAY), FALSE); }
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| define_list ',' NAME
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{ $$ = nextarg ($1, lookup($3,SIMPLE), FALSE); }
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| define_list ',' NAME '[' ']'
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{ $$ = nextarg ($1, lookup($3,ARRAY), FALSE); }
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;
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opt_argument_list : /* empty */
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{ $$ = NULL; }
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| argument_list
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;
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argument_list : expression
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{ $$ = nextarg (NULL,0, FALSE); }
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| argument_list ',' expression
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{ $$ = nextarg ($1,0, FALSE); }
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;
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relational_expression : expression
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{ $$ = 0; }
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| expression REL_OP expression
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{
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$$ = 0;
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switch (*($2))
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{
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case '=':
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generate ("=");
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break;
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case '!':
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generate ("#");
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break;
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case '<':
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if ($2[1] == '=')
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generate ("{");
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else
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generate ("<");
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break;
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case '>':
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if ($2[1] == '=')
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generate ("}");
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else
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generate (">");
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break;
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}
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}
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;
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return_expression : /* empty */
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{
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$$ = 0;
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generate ("0");
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}
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| expression
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;
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expression : named_expression ASSIGN_OP
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{
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if ($2 != '=')
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{
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if ($1 < 0)
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sprintf (genstr, "DL%d:", -$1);
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else
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sprintf (genstr, "l%d:", $1);
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generate (genstr);
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}
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}
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expression
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{
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$$ = 0;
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if ($2 != '=')
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{
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sprintf (genstr, "%c", $2);
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generate (genstr);
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}
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if ($1 < 0)
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sprintf (genstr, "S%d:", -$1);
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else
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sprintf (genstr, "s%d:", $1);
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generate (genstr);
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}
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| expression '+' expression
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{ generate ("+"); }
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| expression '-' expression
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{ generate ("-"); }
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| expression '*' expression
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{ generate ("*"); }
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| expression '/' expression
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{ generate ("/"); }
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| expression '%' expression
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{ generate ("%"); }
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| expression '^' expression
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{ generate ("^"); }
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| '-' expression %prec UNARY_MINUS
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{ generate ("n"); $$ = 1;}
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| named_expression
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{
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$$ = 1;
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if ($1 < 0)
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sprintf (genstr, "L%d:", -$1);
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else
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sprintf (genstr, "l%d:", $1);
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generate (genstr);
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}
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| NUMBER
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{
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int len = strlen($1);
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$$ = 1;
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if (len == 1 && *$1 == '0')
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generate ("0");
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else
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{
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if (len == 1 && *$1 == '1')
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generate ("1");
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else
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{
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generate ("K");
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generate ($1);
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generate (":");
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}
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free ($1);
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}
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}
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| '(' expression ')'
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{ $$ = 1; }
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| NAME '(' opt_argument_list ')'
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{
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$$ = 1;
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if ($3 != NULL)
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{
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sprintf (genstr, "C%d,%s:", lookup($1,FUNCT),
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arg_str ($3));
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free_args ($3);
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}
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else
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sprintf (genstr, "C%d:", lookup($1,FUNCT));
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generate (genstr);
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}
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| INCR_DECR named_expression
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{
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$$ = 1;
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if ($2 < 0)
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{
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if ($1 == '+')
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sprintf (genstr, "DA%d:L%d:", -$2, -$2);
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else
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sprintf (genstr, "DM%d:L%d:", -$2, -$2);
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}
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else
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{
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if ($1 == '+')
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sprintf (genstr, "i%d:l%d:", $2, $2);
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else
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sprintf (genstr, "d%d:l%d:", $2, $2);
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}
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generate (genstr);
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}
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| named_expression INCR_DECR
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{
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$$ = 1;
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if ($1 < 0)
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{
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sprintf (genstr, "DL%d:x", -$1);
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generate (genstr);
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if ($2 == '+')
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sprintf (genstr, "A%d:", -$1);
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else
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sprintf (genstr, "M%d:", -$1);
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}
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else
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{
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sprintf (genstr, "l%d:", $1);
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generate (genstr);
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if ($2 == '+')
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sprintf (genstr, "i%d:", $1);
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else
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sprintf (genstr, "d%d:", $1);
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}
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generate (genstr);
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}
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| Length '(' expression ')'
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{ generate ("cL"); $$ = 1;}
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| Sqrt '(' expression ')'
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{ generate ("cR"); $$ = 1;}
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| Scale '(' expression ')'
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{ generate ("cS"); $$ = 1;}
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;
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named_expression : NAME
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{ $$ = lookup($1,SIMPLE); }
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| NAME '[' expression ']'
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{ $$ = lookup($1,ARRAY); }
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| Ibase
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{ $$ = 0; }
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| Obase
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{ $$ = 1; }
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| Scale
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{ $$ = 2; }
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;
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%%
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