1/*- 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the --- 15 unchanged lines hidden (view full) --- 24 * rights to redistribute these changes. 25 */ 26/* 27 * Author: David B. Golub, Carnegie Mellon University 28 * Date: 7/90 29 */ 30 31#include <sys/cdefs.h> |
32__FBSDID("$FreeBSD: head/sys/ddb/db_expr.c 283088 2015-05-18 22:27:46Z pfg $"); |
33 34#include <sys/param.h> 35 36#include <ddb/ddb.h> 37#include <ddb/db_lex.h> 38#include <ddb/db_access.h> 39#include <ddb/db_command.h> 40 --- 11 unchanged lines hidden (view full) --- 52 t = db_read_token(); 53 if (t == tIDENT) { 54 if (!db_value_of_name(db_tok_string, valuep) && 55 !db_value_of_name_pcpu(db_tok_string, valuep) && 56 !db_value_of_name_vnet(db_tok_string, valuep)) { 57 db_error("Symbol not found\n"); 58 /*NOTREACHED*/ 59 } |
60 return (true); |
61 } 62 if (t == tNUMBER) { 63 *valuep = (db_expr_t)db_tok_number; |
64 return (true); |
65 } 66 if (t == tDOT) { 67 *valuep = (db_expr_t)db_dot; |
68 return (true); |
69 } 70 if (t == tDOTDOT) { 71 *valuep = (db_expr_t)db_prev; |
72 return (true); |
73 } 74 if (t == tPLUS) { 75 *valuep = (db_expr_t) db_next; |
76 return (true); |
77 } 78 if (t == tDITTO) { 79 *valuep = (db_expr_t)db_last_addr; |
80 return (true); |
81 } 82 if (t == tDOLLAR) { 83 if (!db_get_variable(valuep)) |
84 return (false); 85 return (true); |
86 } 87 if (t == tLPAREN) { 88 if (!db_expression(valuep)) { 89 db_error("Syntax error\n"); 90 /*NOTREACHED*/ 91 } 92 t = db_read_token(); 93 if (t != tRPAREN) { 94 db_error("Syntax error\n"); 95 /*NOTREACHED*/ 96 } |
97 return (true); |
98 } 99 db_unread_token(t); |
100 return (false); |
101} 102 103static boolean_t 104db_unary(db_expr_t *valuep) 105{ 106 int t; 107 108 t = db_read_token(); 109 if (t == tMINUS) { 110 if (!db_unary(valuep)) { 111 db_error("Syntax error\n"); 112 /*NOTREACHED*/ 113 } 114 *valuep = -*valuep; |
115 return (true); |
116 } 117 if (t == tSTAR) { 118 /* indirection */ 119 if (!db_unary(valuep)) { 120 db_error("Syntax error\n"); 121 /*NOTREACHED*/ 122 } |
123 *valuep = db_get_value((db_addr_t)*valuep, sizeof(void *), false); 124 return (true); |
125 } 126 db_unread_token(t); 127 return (db_term(valuep)); 128} 129 130static boolean_t 131db_mult_expr(db_expr_t *valuep) 132{ 133 db_expr_t lhs, rhs; 134 int t; 135 136 if (!db_unary(&lhs)) |
137 return (false); |
138 139 t = db_read_token(); 140 while (t == tSTAR || t == tSLASH || t == tPCT || t == tHASH) { 141 if (!db_term(&rhs)) { 142 db_error("Syntax error\n"); 143 /*NOTREACHED*/ 144 } 145 if (t == tSTAR) --- 9 unchanged lines hidden (view full) --- 155 lhs %= rhs; 156 else 157 lhs = ((lhs+rhs-1)/rhs)*rhs; 158 } 159 t = db_read_token(); 160 } 161 db_unread_token(t); 162 *valuep = lhs; |
163 return (true); |
164} 165 166static boolean_t 167db_add_expr(db_expr_t *valuep) 168{ 169 db_expr_t lhs, rhs; 170 int t; 171 172 if (!db_mult_expr(&lhs)) |
173 return (false); |
174 175 t = db_read_token(); 176 while (t == tPLUS || t == tMINUS) { 177 if (!db_mult_expr(&rhs)) { 178 db_error("Syntax error\n"); 179 /*NOTREACHED*/ 180 } 181 if (t == tPLUS) 182 lhs += rhs; 183 else 184 lhs -= rhs; 185 t = db_read_token(); 186 } 187 db_unread_token(t); 188 *valuep = lhs; |
189 return (true); |
190} 191 192static boolean_t 193db_shift_expr(db_expr_t *valuep) 194{ 195 db_expr_t lhs, rhs; 196 int t; 197 198 if (!db_add_expr(&lhs)) |
199 return (false); |
200 201 t = db_read_token(); 202 while (t == tSHIFT_L || t == tSHIFT_R) { 203 if (!db_add_expr(&rhs)) { 204 db_error("Syntax error\n"); 205 /*NOTREACHED*/ 206 } 207 if (rhs < 0) { --- 5 unchanged lines hidden (view full) --- 213 else { 214 /* Shift right is unsigned */ 215 lhs = (unsigned) lhs >> rhs; 216 } 217 t = db_read_token(); 218 } 219 db_unread_token(t); 220 *valuep = lhs; |
221 return (true); |
222} 223 224int 225db_expression(db_expr_t *valuep) 226{ 227 return (db_shift_expr(valuep)); 228} |