1 /* $NetBSD: gsp_gram.y,v 1.3 2001/06/13 10:46:06 wiz Exp $ */ 2 /* 3 * Yacc syntax for GSP assembler 4 * 5 * Copyright (c) 1993 Paul Mackerras. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Paul Mackerras. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* declarations */ 35 36 %{ 37 #include <sys/cdefs.h> 38 #ifndef lint 39 __RCSID("$NetBSD: gsp_gram.y,v 1.3 2001/06/13 10:46:06 wiz Exp $"); 40 #endif 41 42 #include <stdio.h> 43 #include "gsp_ass.h" 44 %} 45 46 %union { 47 long y_int; 48 char *y_id; 49 expr y_expr; 50 operand y_opnd; 51 } 52 53 %token LEFT_SHIFT, RIGHT_SHIFT 54 55 %term <y_id> ID, STRING 56 %term <y_int> NUMBER, REGISTER 57 %term UMINUS 58 59 /* operator precedences - lowest to highest */ 60 %nonassoc ':' /* concatenate y:x */ 61 %left LEFT_SHIFT, RIGHT_SHIFT 62 %left '^' /* EXCLUSIVE OR operator */ 63 %left '|' /* OR operator */ 64 %left '&' /* AND operator */ 65 %left '+', '-' 66 %left '*', '/' 67 %nonassoc '~', UMINUS /* NOT operator */ 68 69 %start line 70 71 /* types of non-terminals */ 72 %type <y_expr> expr 73 %type <y_opnd> operand, operands, ea 74 75 %% 76 /* rules */ 77 78 line : label ID operands { statement($2, $3); } 79 | ID operands { statement($1, $2); } 80 | label 81 | ID '=' expr { do_asg($1, $3, 0); } 82 | /* empty */ 83 | error 84 ; 85 86 label : ID ':' { set_label($1); } 87 | NUMBER ':' { set_numeric_label($1); } 88 ; 89 90 operands : /* empty */ { $$ = NULL; } 91 | operand { $$ = $1; } 92 | operands ',' operand { $$ = add_operand($1, $3); } 93 ; 94 95 operand : REGISTER { $$ = reg_op($1); } 96 | ea { $$ = $1; } 97 | expr { $$ = expr_op($1); } 98 | STRING { $$ = string_op($1); } 99 ; 100 101 ea : '@' expr { $$ = abs_adr($2); } 102 | '*' REGISTER { $$ = reg_ind($2, M_IND); } 103 | '*' REGISTER ID { $$ = reg_indxy($2, $3); } 104 | '*' REGISTER '+' { $$ = reg_ind($2, M_POSTINC); } 105 | '*' '-' REGISTER { $$ = reg_ind($3, M_PREDEC); } 106 | '-' '*' REGISTER { $$ = reg_ind($3, M_PREDEC); } 107 | '*' REGISTER '(' expr ')' 108 { $$ = reg_index($2, $4); } 109 ; 110 111 expr : ID { $$ = id_expr($1); } 112 | NUMBER { $$ = num_expr($1); } 113 | '.' { $$ = here_expr(); } 114 | '(' expr ')' { $$ = $2; } 115 | '~' expr { $$ = bexpr('~', $2, NULL); } 116 | '-' expr %prec UMINUS 117 { $$ = bexpr(NEG, $2, NULL); } 118 | expr '*' expr { $$ = bexpr('*', $1, $3); } 119 | expr '/' expr { $$ = bexpr('/', $1, $3); } 120 | expr '+' expr { $$ = bexpr('+', $1, $3); } 121 | expr '-' expr { $$ = bexpr('-', $1, $3); } 122 | expr '&' expr { $$ = bexpr('&', $1, $3); } 123 | expr '|' expr { $$ = bexpr('|', $1, $3); } 124 | expr '^' expr { $$ = bexpr('^', $1, $3); } 125 | expr ':' expr { $$ = bexpr(':', $1, $3); } 126 | expr LEFT_SHIFT expr { $$ = bexpr(LEFT_SHIFT, $1, $3); } 127 | expr RIGHT_SHIFT expr { $$ = bexpr(RIGHT_SHIFT, $1, $3); } 128 ; 129 130