scripts/dtc/dtc-lexer.l

   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>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? {
 155                         char *e;
 156                         DPRINT("Integer Literal: '%s'\n", yytext);
 157
 158                         errno = 0;
 159                         yylval.integer = strtoull(yytext, &e, 0);
 160
 161                         if (*e && e[strspn(e, "UL")]) {
 162                                 lexical_error("Bad integer literal '%s'",
 163                                               yytext);
 164                         }
 165
 166                         if (errno == ERANGE)
 167                                 lexical_error("Integer literal '%s' out of range",
 168                                               yytext);
 169                         else
 170                                 /* ERANGE is the only strtoull error triggerable
 171                                  *  by strings matching the pattern */
 172                                 assert(errno == 0);
 173                         return DT_LITERAL;
 174                 }
 175
 176 <*>{CHAR_LITERAL}       {
 177                         struct data d;
 178                         DPRINT("Character literal: %s\n", yytext);
 179
 180                         d = data_copy_escape_string(yytext+1, yyleng-2);
 181                         if (d.len == 1) {
 182                                 lexical_error("Empty character literal");
 183                                 yylval.integer = 0;
 184                         } else {
 185                                 yylval.integer = (unsigned char)d.val[0];
 186
 187                                 if (d.len > 2)
 188                                         lexical_error("Character literal has %d"
 189                                                       " characters instead of 1",
 190                                                       d.len - 1);
 191                         }
 192
 193                         data_free(d);
 194                         return DT_CHAR_LITERAL;
 195                 }
 196
 197 <*>\&{LABEL}    {       /* label reference */
 198                         DPRINT("Ref: %s\n", yytext+1);
 199                         yylval.labelref = xstrdup(yytext+1);
 200                         return DT_LABEL_REF;
 201                 }
 202
 203 <*>"&{/"{PATHCHAR}*\}   {       /* new-style path reference */
 204                         yytext[yyleng-1] = '\0';
 205                         DPRINT("Ref: %s\n", yytext+2);
 206                         yylval.labelref = xstrdup(yytext+2);
 207                         return DT_PATH_REF;
 208                 }
 209
 210 <BYTESTRING>[0-9a-fA-F]{2} {
 211                         yylval.byte = strtol(yytext, NULL, 16);
 212                         DPRINT("Byte: %02x\n", (int)yylval.byte);
 213                         return DT_BYTE;
 214                 }
 215
 216 <BYTESTRING>"]" {
 217                         DPRINT("/BYTESTRING\n");
 218                         BEGIN_DEFAULT();
 219                         return ']';
 220                 }
 221
 222 <PROPNODENAME>\\?{PROPNODECHAR}+ {
 223                         DPRINT("PropNodeName: %s\n", yytext);
 224                         yylval.propnodename = xstrdup((yytext[0] == '\\') ?
 225                                                         yytext + 1 : yytext);
 226                         BEGIN_DEFAULT();
 227                         return DT_PROPNODENAME;
 228                 }
 229
 230 "/incbin/"      {
 231                         DPRINT("Binary Include\n");
 232                         return DT_INCBIN;
 233                 }
 234
 235 <*>{WS}+        /* eat whitespace */
 236 <*>{COMMENT}+   /* eat C-style comments */
 237 <*>{LINECOMMENT}+ /* eat C++-style comments */
 238
 239 <*>"<<"         { return DT_LSHIFT; };
 240 <*>">>"         { return DT_RSHIFT; };
 241 <*>"<="         { return DT_LE; };
 242 <*>">="         { return DT_GE; };
 243 <*>"=="         { return DT_EQ; };
 244 <*>"!="         { return DT_NE; };
 245 <*>"&&"         { return DT_AND; };
 246 <*>"||"         { return DT_OR; };
 247
 248 <*>.            {
 249                         DPRINT("Char: %c (\\x%02x)\n", yytext[0],
 250                                 (unsigned)yytext[0]);
 251                         if (yytext[0] == '[') {
 252                                 DPRINT("<BYTESTRING>\n");
 253                                 BEGIN(BYTESTRING);
 254                         }
 255                         if ((yytext[0] == '{')
 256                             || (yytext[0] == ';')) {
 257                                 DPRINT("<PROPNODENAME>\n");
 258                                 BEGIN(PROPNODENAME);
 259                         }
 260                         return yytext[0];
 261                 }
 262
 263 %%
 264
 265 static void push_input_file(const char *filename)
 266 {
 267         assert(filename);
 268
 269         srcfile_push(filename);
 270
 271         yyin = current_srcfile->f;
 272
 273         yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE));
 274 }
 275
 276
 277 static bool pop_input_file(void)
 278 {
 279         if (srcfile_pop() == 0)
 280                 return false;
 281
 282         yypop_buffer_state();
 283         yyin = current_srcfile->f;
 284
 285         return true;
 286 }
 287
 288 static void lexical_error(const char *fmt, ...)
 289 {
 290         va_list ap;
 291
 292         va_start(ap, fmt);
 293         srcpos_verror(&yylloc, "Lexical error", fmt, ap);
 294         va_end(ap);
 295
 296         treesource_error = true;
 297 }