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