1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005. 4 */ 5 6 %option noyywrap nounput noinput never-interactive 7 8 %x BYTESTRING 9 %x PROPNODENAME 10 %s V1 11 12 PROPNODECHAR [a-zA-Z0-9,._+*#?@-] 13 PATHCHAR ({PROPNODECHAR}|[/]) 14 LABEL [a-zA-Z_][a-zA-Z0-9_]* 15 STRING \"([^\\"]|\\.)*\" 16 CHAR_LITERAL '([^']|\\')*' 17 WS [[:space:]] 18 COMMENT "/*"([^*]|\*+[^*/])*\*+"/" 19 LINECOMMENT "//".*\n 20 21 %{ 22 #include "dtc.h" 23 #include "srcpos.h" 24 #include "dtc-parser.tab.h" 25 26 extern bool treesource_error; 27 28 /* CAUTION: this will stop working if we ever use yyless() or yyunput() */ 29 #define YY_USER_ACTION \ 30 { \ 31 srcpos_update(&yylloc, yytext, yyleng); \ 32 } 33 34 /*#define LEXDEBUG 1*/ 35 36 #ifdef LEXDEBUG 37 #define DPRINT(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__) 38 #else 39 #define DPRINT(fmt, ...) do { } while (0) 40 #endif 41 42 static int dts_version = 1; 43 44 #define BEGIN_DEFAULT() DPRINT("<V1>\n"); \ 45 BEGIN(V1); \ 46 47 static void push_input_file(const char *filename); 48 static bool pop_input_file(void); 49 static void PRINTF(1, 2) lexical_error(const char *fmt, ...); 50 51 %} 52 53 %% 54 <*>"/include/"{WS}*{STRING} { 55 char *name = strchr(yytext, '\"') + 1; 56 yytext[yyleng-1] = '\0'; 57 push_input_file(name); 58 } 59 60 <*>^"#"(line)?[ \t]+[0-9]+[ \t]+{STRING}([ \t]+[0-9]+)* { 61 char *line, *fnstart, *fnend; 62 struct data fn; 63 /* skip text before line # */ 64 line = yytext; 65 while (!isdigit((unsigned char)*line)) 66 line++; 67 68 /* regexp ensures that first and list " 69 * in the whole yytext are those at 70 * beginning and end of the filename string */ 71 fnstart = memchr(yytext, '"', yyleng); 72 for (fnend = yytext + yyleng - 1; 73 *fnend != '"'; fnend--) 74 ; 75 assert(fnstart && fnend && (fnend > fnstart)); 76 77 fn = data_copy_escape_string(fnstart + 1, 78 fnend - fnstart - 1); 79 80 /* Don't allow nuls in filenames */ 81 if (memchr(fn.val, '\0', fn.len - 1)) 82 lexical_error("nul in line number directive"); 83 84 /* -1 since #line is the number of the next line */ 85 srcpos_set_line(xstrdup(fn.val), atoi(line) - 1); 86 data_free(fn); 87 } 88 89 <*><<EOF>> { 90 if (!pop_input_file()) { 91 yyterminate(); 92 } 93 } 94 95 <*>{STRING} { 96 DPRINT("String: %s\n", yytext); 97 yylval.data = data_copy_escape_string(yytext+1, 98 yyleng-2); 99 return DT_STRING; 100 } 101 102 <*>"/dts-v1/" { 103 DPRINT("Keyword: /dts-v1/\n"); 104 dts_version = 1; 105 BEGIN_DEFAULT(); 106 return DT_V1; 107 } 108 109 <*>"/plugin/" { 110 DPRINT("Keyword: /plugin/\n"); 111 return DT_PLUGIN; 112 } 113 114 <*>"/memreserve/" { 115 DPRINT("Keyword: /memreserve/\n"); 116 BEGIN_DEFAULT(); 117 return DT_MEMRESERVE; 118 } 119 120 <*>"/bits/" { 121 DPRINT("Keyword: /bits/\n"); 122 BEGIN_DEFAULT(); 123 return DT_BITS; 124 } 125 126 <*>"/delete-property/" { 127 DPRINT("Keyword: /delete-property/\n"); 128 DPRINT("<PROPNODENAME>\n"); 129 BEGIN(PROPNODENAME); 130 return DT_DEL_PROP; 131 } 132 133 <*>"/delete-node/" { 134 DPRINT("Keyword: /delete-node/\n"); 135 DPRINT("<PROPNODENAME>\n"); 136 BEGIN(PROPNODENAME); 137 return DT_DEL_NODE; 138 } 139 140 <*>"/omit-if-no-ref/" { 141 DPRINT("Keyword: /omit-if-no-ref/\n"); 142 DPRINT("<PROPNODENAME>\n"); 143 BEGIN(PROPNODENAME); 144 return DT_OMIT_NO_REF; 145 } 146 147 <*>{LABEL}: { 148 DPRINT("Label: %s\n", yytext); 149 yylval.labelref = xstrdup(yytext); 150 yylval.labelref[yyleng-1] = '\0'; 151 return DT_LABEL; 152 } 153 154 <V1>{LABEL} { 155 /* Missed includes or macro definitions while 156 * preprocessing can lead to unexpected identifiers in 157 * the input. Report a slightly more informative error 158 * in this case */ 159 160 lexical_error("Unexpected '%s'", yytext); 161 162 /* Treat it as a literal which often generates further 163 * useful error messages */ 164 165 yylval.integer = 0; 166 return DT_LITERAL; 167 } 168 169 <V1>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? { 170 char *e; 171 DPRINT("Integer Literal: '%s'\n", yytext); 172 173 errno = 0; 174 yylval.integer = strtoull(yytext, &e, 0); 175 176 if (*e && e[strspn(e, "UL")]) { 177 lexical_error("Bad integer literal '%s'", 178 yytext); 179 } 180 181 if (errno == ERANGE) 182 lexical_error("Integer literal '%s' out of range", 183 yytext); 184 else 185 /* ERANGE is the only strtoull error triggerable 186 * by strings matching the pattern */ 187 assert(errno == 0); 188 return DT_LITERAL; 189 } 190 191 <*>{CHAR_LITERAL} { 192 struct data d; 193 DPRINT("Character literal: %s\n", yytext); 194 195 d = data_copy_escape_string(yytext+1, yyleng-2); 196 if (d.len == 1) { 197 lexical_error("Empty character literal"); 198 yylval.integer = 0; 199 } else { 200 yylval.integer = (unsigned char)d.val[0]; 201 202 if (d.len > 2) 203 lexical_error("Character literal has %d" 204 " characters instead of 1", 205 d.len - 1); 206 } 207 208 data_free(d); 209 return DT_CHAR_LITERAL; 210 } 211 212 <*>\&{LABEL} { /* label reference */ 213 DPRINT("Ref: %s\n", yytext+1); 214 yylval.labelref = xstrdup(yytext+1); 215 return DT_LABEL_REF; 216 } 217 218 <*>"&{"{PATHCHAR}*\} { /* new-style path reference */ 219 yytext[yyleng-1] = '\0'; 220 DPRINT("Ref: %s\n", yytext+2); 221 yylval.labelref = xstrdup(yytext+2); 222 return DT_PATH_REF; 223 } 224 225 <BYTESTRING>[0-9a-fA-F]{2} { 226 yylval.byte = strtol(yytext, NULL, 16); 227 DPRINT("Byte: %02x\n", (int)yylval.byte); 228 return DT_BYTE; 229 } 230 231 <BYTESTRING>"]" { 232 DPRINT("/BYTESTRING\n"); 233 BEGIN_DEFAULT(); 234 return ']'; 235 } 236 237 <PROPNODENAME>\\?{PROPNODECHAR}+ { 238 DPRINT("PropNodeName: %s\n", yytext); 239 yylval.propnodename = xstrdup((yytext[0] == '\\') ? 240 yytext + 1 : yytext); 241 BEGIN_DEFAULT(); 242 return DT_PROPNODENAME; 243 } 244 245 "/incbin/" { 246 DPRINT("Binary Include\n"); 247 return DT_INCBIN; 248 } 249 250 <*>{WS}+ /* eat whitespace */ 251 <*>{COMMENT}+ /* eat C-style comments */ 252 <*>{LINECOMMENT}+ /* eat C++-style comments */ 253 254 <*>"<<" { return DT_LSHIFT; }; 255 <*>">>" { return DT_RSHIFT; }; 256 <*>"<=" { return DT_LE; }; 257 <*>">=" { return DT_GE; }; 258 <*>"==" { return DT_EQ; }; 259 <*>"!=" { return DT_NE; }; 260 <*>"&&" { return DT_AND; }; 261 <*>"||" { return DT_OR; }; 262 263 <*>. { 264 DPRINT("Char: %c (\\x%02x)\n", yytext[0], 265 (unsigned)yytext[0]); 266 if (yytext[0] == '[') { 267 DPRINT("<BYTESTRING>\n"); 268 BEGIN(BYTESTRING); 269 } 270 if ((yytext[0] == '{') 271 || (yytext[0] == ';')) { 272 DPRINT("<PROPNODENAME>\n"); 273 BEGIN(PROPNODENAME); 274 } 275 return yytext[0]; 276 } 277 278 %% 279 280 static void push_input_file(const char *filename) 281 { 282 assert(filename); 283 284 srcfile_push(filename); 285 286 yyin = current_srcfile->f; 287 288 yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE)); 289 } 290 291 292 static bool pop_input_file(void) 293 { 294 if (srcfile_pop() == 0) 295 return false; 296 297 yypop_buffer_state(); 298 yyin = current_srcfile->f; 299 300 return true; 301 } 302 303 static void lexical_error(const char *fmt, ...) 304 { 305 va_list ap; 306 307 va_start(ap, fmt); 308 srcpos_verror(&yylloc, "Lexical error", fmt, ap); 309 va_end(ap); 310 311 treesource_error = true; 312 } 313