1 /* 2 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. 3 * 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of the 8 * License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 18 * USA 19 */ 20 21 %option noyywrap nounput noinput never-interactive 22 23 %x BYTESTRING 24 %x PROPNODENAME 25 %s V1 26 27 PROPNODECHAR [a-zA-Z0-9,._+*#?@-] 28 PATHCHAR ({PROPNODECHAR}|[/]) 29 LABEL [a-zA-Z_][a-zA-Z0-9_]* 30 STRING \"([^\\"]|\\.)*\" 31 CHAR_LITERAL '([^']|\\')*' 32 WS [[:space:]] 33 COMMENT "/*"([^*]|\*+[^*/])*\*+"/" 34 LINECOMMENT "//".*\n 35 36 %{ 37 #include "dtc.h" 38 #include "srcpos.h" 39 #include "dtc-parser.tab.h" 40 41 YYLTYPE yylloc; 42 extern bool treesource_error; 43 44 /* CAUTION: this will stop working if we ever use yyless() or yyunput() */ 45 #define YY_USER_ACTION \ 46 { \ 47 srcpos_update(&yylloc, yytext, yyleng); \ 48 } 49 50 /*#define LEXDEBUG 1*/ 51 52 #ifdef LEXDEBUG 53 #define DPRINT(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__) 54 #else 55 #define DPRINT(fmt, ...) do { } while (0) 56 #endif 57 58 static int dts_version = 1; 59 60 #define BEGIN_DEFAULT() DPRINT("<V1>\n"); \ 61 BEGIN(V1); \ 62 63 static void push_input_file(const char *filename); 64 static bool pop_input_file(void); 65 static void PRINTF(1, 2) lexical_error(const char *fmt, ...); 66 67 %} 68 69 %% 70 <*>"/include/"{WS}*{STRING} { 71 char *name = strchr(yytext, '\"') + 1; 72 yytext[yyleng-1] = '\0'; 73 push_input_file(name); 74 } 75 76 <*>^"#"(line)?[ \t]+[0-9]+[ \t]+{STRING}([ \t]+[0-9]+)? { 77 char *line, *fnstart, *fnend; 78 struct data fn; 79 /* skip text before line # */ 80 line = yytext; 81 while (!isdigit((unsigned char)*line)) 82 line++; 83 84 /* regexp ensures that first and list " 85 * in the whole yytext are those at 86 * beginning and end of the filename string */ 87 fnstart = memchr(yytext, '"', yyleng); 88 for (fnend = yytext + yyleng - 1; 89 *fnend != '"'; fnend--) 90 ; 91 assert(fnstart && fnend && (fnend > fnstart)); 92 93 fn = data_copy_escape_string(fnstart + 1, 94 fnend - fnstart - 1); 95 96 /* Don't allow nuls in filenames */ 97 if (memchr(fn.val, '\0', fn.len - 1)) 98 lexical_error("nul in line number directive"); 99 100 /* -1 since #line is the number of the next line */ 101 srcpos_set_line(xstrdup(fn.val), atoi(line) - 1); 102 data_free(fn); 103 } 104 105 <*><<EOF>> { 106 if (!pop_input_file()) { 107 yyterminate(); 108 } 109 } 110 111 <*>{STRING} { 112 DPRINT("String: %s\n", yytext); 113 yylval.data = data_copy_escape_string(yytext+1, 114 yyleng-2); 115 return DT_STRING; 116 } 117 118 <*>"/dts-v1/" { 119 DPRINT("Keyword: /dts-v1/\n"); 120 dts_version = 1; 121 BEGIN_DEFAULT(); 122 return DT_V1; 123 } 124 125 <*>"/plugin/" { 126 DPRINT("Keyword: /plugin/\n"); 127 return DT_PLUGIN; 128 } 129 130 <*>"/memreserve/" { 131 DPRINT("Keyword: /memreserve/\n"); 132 BEGIN_DEFAULT(); 133 return DT_MEMRESERVE; 134 } 135 136 <*>"/bits/" { 137 DPRINT("Keyword: /bits/\n"); 138 BEGIN_DEFAULT(); 139 return DT_BITS; 140 } 141 142 <*>"/delete-property/" { 143 DPRINT("Keyword: /delete-property/\n"); 144 DPRINT("<PROPNODENAME>\n"); 145 BEGIN(PROPNODENAME); 146 return DT_DEL_PROP; 147 } 148 149 <*>"/delete-node/" { 150 DPRINT("Keyword: /delete-node/\n"); 151 DPRINT("<PROPNODENAME>\n"); 152 BEGIN(PROPNODENAME); 153 return DT_DEL_NODE; 154 } 155 156 <*>"/omit-if-no-ref/" { 157 DPRINT("Keyword: /omit-if-no-ref/\n"); 158 DPRINT("<PROPNODENAME>\n"); 159 BEGIN(PROPNODENAME); 160 return DT_OMIT_NO_REF; 161 } 162 163 <*>{LABEL}: { 164 DPRINT("Label: %s\n", yytext); 165 yylval.labelref = xstrdup(yytext); 166 yylval.labelref[yyleng-1] = '\0'; 167 return DT_LABEL; 168 } 169 170 <V1>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? { 171 char *e; 172 DPRINT("Integer Literal: '%s'\n", yytext); 173 174 errno = 0; 175 yylval.integer = strtoull(yytext, &e, 0); 176 177 if (*e && e[strspn(e, "UL")]) { 178 lexical_error("Bad integer literal '%s'", 179 yytext); 180 } 181 182 if (errno == ERANGE) 183 lexical_error("Integer literal '%s' out of range", 184 yytext); 185 else 186 /* ERANGE is the only strtoull error triggerable 187 * by strings matching the pattern */ 188 assert(errno == 0); 189 return DT_LITERAL; 190 } 191 192 <*>{CHAR_LITERAL} { 193 struct data d; 194 DPRINT("Character literal: %s\n", yytext); 195 196 d = data_copy_escape_string(yytext+1, yyleng-2); 197 if (d.len == 1) { 198 lexical_error("Empty character literal"); 199 yylval.integer = 0; 200 } else { 201 yylval.integer = (unsigned char)d.val[0]; 202 203 if (d.len > 2) 204 lexical_error("Character literal has %d" 205 " characters instead of 1", 206 d.len - 1); 207 } 208 209 data_free(d); 210 return DT_CHAR_LITERAL; 211 } 212 213 <*>\&{LABEL} { /* label reference */ 214 DPRINT("Ref: %s\n", yytext+1); 215 yylval.labelref = xstrdup(yytext+1); 216 return DT_LABEL_REF; 217 } 218 219 <*>"&{/"{PATHCHAR}*\} { /* new-style path reference */ 220 yytext[yyleng-1] = '\0'; 221 DPRINT("Ref: %s\n", yytext+2); 222 yylval.labelref = xstrdup(yytext+2); 223 return DT_PATH_REF; 224 } 225 226 <BYTESTRING>[0-9a-fA-F]{2} { 227 yylval.byte = strtol(yytext, NULL, 16); 228 DPRINT("Byte: %02x\n", (int)yylval.byte); 229 return DT_BYTE; 230 } 231 232 <BYTESTRING>"]" { 233 DPRINT("/BYTESTRING\n"); 234 BEGIN_DEFAULT(); 235 return ']'; 236 } 237 238 <PROPNODENAME>\\?{PROPNODECHAR}+ { 239 DPRINT("PropNodeName: %s\n", yytext); 240 yylval.propnodename = xstrdup((yytext[0] == '\\') ? 241 yytext + 1 : yytext); 242 BEGIN_DEFAULT(); 243 return DT_PROPNODENAME; 244 } 245 246 "/incbin/" { 247 DPRINT("Binary Include\n"); 248 return DT_INCBIN; 249 } 250 251 <*>{WS}+ /* eat whitespace */ 252 <*>{COMMENT}+ /* eat C-style comments */ 253 <*>{LINECOMMENT}+ /* eat C++-style comments */ 254 255 <*>"<<" { return DT_LSHIFT; }; 256 <*>">>" { return DT_RSHIFT; }; 257 <*>"<=" { return DT_LE; }; 258 <*>">=" { return DT_GE; }; 259 <*>"==" { return DT_EQ; }; 260 <*>"!=" { return DT_NE; }; 261 <*>"&&" { return DT_AND; }; 262 <*>"||" { return DT_OR; }; 263 264 <*>. { 265 DPRINT("Char: %c (\\x%02x)\n", yytext[0], 266 (unsigned)yytext[0]); 267 if (yytext[0] == '[') { 268 DPRINT("<BYTESTRING>\n"); 269 BEGIN(BYTESTRING); 270 } 271 if ((yytext[0] == '{') 272 || (yytext[0] == ';')) { 273 DPRINT("<PROPNODENAME>\n"); 274 BEGIN(PROPNODENAME); 275 } 276 return yytext[0]; 277 } 278 279 %% 280 281 static void push_input_file(const char *filename) 282 { 283 assert(filename); 284 285 srcfile_push(filename); 286 287 yyin = current_srcfile->f; 288 289 yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE)); 290 } 291 292 293 static bool pop_input_file(void) 294 { 295 if (srcfile_pop() == 0) 296 return false; 297 298 yypop_buffer_state(); 299 yyin = current_srcfile->f; 300 301 return true; 302 } 303 304 static void lexical_error(const char *fmt, ...) 305 { 306 va_list ap; 307 308 va_start(ap, fmt); 309 srcpos_verror(&yylloc, "Lexical error", fmt, ap); 310 va_end(ap); 311 312 treesource_error = true; 313 } 314