contrib/dtc/dtc-lexer.l

   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 #define MAX_INCLUDE_NESTING 100
  42 YY_BUFFER_STATE include_stack[MAX_INCLUDE_NESTING];
  43 int include_stack_pointer = 0;
  44
  45 YYLTYPE yylloc;
  46 extern bool treesource_error;
  47
  48 /* CAUTION: this will stop working if we ever use yyless() or yyunput() */
  49 #define YY_USER_ACTION \
  50         { \
  51                 srcpos_update(&yylloc, yytext, yyleng); \
  52         }
  53
  54 /*#define LEXDEBUG      1*/
  55
  56 #ifdef LEXDEBUG
  57 #define DPRINT(fmt, ...)        fprintf(stderr, fmt, ##__VA_ARGS__)
  58 #else
  59 #define DPRINT(fmt, ...)        do { } while (0)
  60 #endif
  61
  62 static int dts_version = 1;
  63
  64 #define BEGIN_DEFAULT()         DPRINT("<V1>\n"); \
  65                                 BEGIN(V1); \
  66
  67 static void push_input_file(const char *filename);
  68 static bool pop_input_file(void);
  69 #ifdef __GNUC__
  70 static void lexical_error(const char *fmt, ...)
  71         __attribute__((format (printf, 1, 2)));
  72 #else
  73 static void lexical_error(const char *fmt, ...);
  74 #endif
  75
  76 %}
  77
  78 %%
  79 <*>"/include/"{WS}*{STRING} {
  80                         char *name = strchr(yytext, '\"') + 1;
  81                         yytext[yyleng-1] = '\0';
  82                         push_input_file(name);
  83                 }
  84
  85 <*>^"#"(line)?[ \t]+[0-9]+[ \t]+{STRING}([ \t]+[0-9]+)? {
  86                         char *line, *fnstart, *fnend;
  87                         struct data fn;
  88                         /* skip text before line # */
  89                         line = yytext;
  90                         while (!isdigit((unsigned char)*line))
  91                                 line++;
  92
  93                         /* regexp ensures that first and list "
  94                          * in the whole yytext are those at
  95                          * beginning and end of the filename string */
  96                         fnstart = memchr(yytext, '"', yyleng);
  97                         for (fnend = yytext + yyleng - 1;
  98                              *fnend != '"'; fnend--)
  99                                 ;
 100                         assert(fnstart && fnend && (fnend > fnstart));
 101
 102                         fn = data_copy_escape_string(fnstart + 1,
 103                                                      fnend - fnstart - 1);
 104
 105                         /* Don't allow nuls in filenames */
 106                         if (memchr(fn.val, '\0', fn.len - 1))
 107                                 lexical_error("nul in line number directive");
 108
 109                         /* -1 since #line is the number of the next line */
 110                         srcpos_set_line(xstrdup(fn.val), atoi(line) - 1);
 111                         data_free(fn);
 112                 }
 113
 114 <*><<EOF>>              {
 115                         if (!pop_input_file()) {
 116                                 yyterminate();
 117                         }
 118                 }
 119
 120 <*>{STRING}     {
 121                         DPRINT("String: %s\n", yytext);
 122                         yylval.data = data_copy_escape_string(yytext+1,
 123                                         yyleng-2);
 124                         return DT_STRING;
 125                 }
 126
 127 <*>"/dts-v1/"   {
 128                         DPRINT("Keyword: /dts-v1/\n");
 129                         dts_version = 1;
 130                         BEGIN_DEFAULT();
 131                         return DT_V1;
 132                 }
 133
 134 <*>"/plugin/"   {
 135                         DPRINT("Keyword: /plugin/\n");
 136                         return DT_PLUGIN;
 137                 }
 138
 139 <*>"/memreserve/"       {
 140                         DPRINT("Keyword: /memreserve/\n");
 141                         BEGIN_DEFAULT();
 142                         return DT_MEMRESERVE;
 143                 }
 144
 145 <*>"/bits/"     {
 146                         DPRINT("Keyword: /bits/\n");
 147                         BEGIN_DEFAULT();
 148                         return DT_BITS;
 149                 }
 150
 151 <*>"/delete-property/"  {
 152                         DPRINT("Keyword: /delete-property/\n");
 153                         DPRINT("<PROPNODENAME>\n");
 154                         BEGIN(PROPNODENAME);
 155                         return DT_DEL_PROP;
 156                 }
 157
 158 <*>"/delete-node/"      {
 159                         DPRINT("Keyword: /delete-node/\n");
 160                         DPRINT("<PROPNODENAME>\n");
 161                         BEGIN(PROPNODENAME);
 162                         return DT_DEL_NODE;
 163                 }
 164
 165 <*>{LABEL}:     {
 166                         DPRINT("Label: %s\n", yytext);
 167                         yylval.labelref = xstrdup(yytext);
 168                         yylval.labelref[yyleng-1] = '\0';
 169                         return DT_LABEL;
 170                 }
 171
 172 <V1>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? {
 173                         char *e;
 174                         DPRINT("Integer Literal: '%s'\n", yytext);
 175
 176                         errno = 0;
 177                         yylval.integer = strtoull(yytext, &e, 0);
 178
 179                         if (*e && e[strspn(e, "UL")]) {
 180                                 lexical_error("Bad integer literal '%s'",
 181                                               yytext);
 182                         }
 183
 184                         if (errno == ERANGE)
 185                                 lexical_error("Integer literal '%s' out of range",
 186                                               yytext);
 187                         else
 188                                 /* ERANGE is the only strtoull error triggerable
 189                                  *  by strings matching the pattern */
 190                                 assert(errno == 0);
 191                         return DT_LITERAL;
 192                 }
 193
 194 <*>{CHAR_LITERAL}       {
 195                         struct data d;
 196                         DPRINT("Character literal: %s\n", yytext);
 197
 198                         d = data_copy_escape_string(yytext+1, yyleng-2);
 199                         if (d.len == 1) {
 200                                 lexical_error("Empty character literal");
 201                                 yylval.integer = 0;
 202                         } else {
 203                                 yylval.integer = (unsigned char)d.val[0];
 204
 205                                 if (d.len > 2)
 206                                         lexical_error("Character literal has %d"
 207                                                       " characters instead of 1",
 208                                                       d.len - 1);
 209                         }
 210
 211                         data_free(d);
 212                         return DT_CHAR_LITERAL;
 213                 }
 214
 215 <*>\&{LABEL}    {       /* label reference */
 216                         DPRINT("Ref: %s\n", yytext+1);
 217                         yylval.labelref = xstrdup(yytext+1);
 218                         return DT_REF;
 219                 }
 220
 221 <*>"&{/"{PATHCHAR}*\}   {       /* new-style path reference */
 222                         yytext[yyleng-1] = '\0';
 223                         DPRINT("Ref: %s\n", yytext+2);
 224                         yylval.labelref = xstrdup(yytext+2);
 225                         return DT_REF;
 226                 }
 227
 228 <BYTESTRING>[0-9a-fA-F]{2} {
 229                         yylval.byte = strtol(yytext, NULL, 16);
 230                         DPRINT("Byte: %02x\n", (int)yylval.byte);
 231                         return DT_BYTE;
 232                 }
 233
 234 <BYTESTRING>"]" {
 235                         DPRINT("/BYTESTRING\n");
 236                         BEGIN_DEFAULT();
 237                         return ']';
 238                 }
 239
 240 <PROPNODENAME>\\?{PROPNODECHAR}+ {
 241                         DPRINT("PropNodeName: %s\n", yytext);
 242                         yylval.propnodename = xstrdup((yytext[0] == '\\') ?
 243                                                         yytext + 1 : yytext);
 244                         BEGIN_DEFAULT();
 245                         return DT_PROPNODENAME;
 246                 }
 247
 248 "/incbin/"      {
 249                         DPRINT("Binary Include\n");
 250                         return DT_INCBIN;
 251                 }
 252
 253 <*>{WS}+        /* eat whitespace */
 254 <*>{COMMENT}+   /* eat C-style comments */
 255 <*>{LINECOMMENT}+ /* eat C++-style comments */
 256
 257 <*>"<<"         { return DT_LSHIFT; };
 258 <*>">>"         { return DT_RSHIFT; };
 259 <*>"<="         { return DT_LE; };
 260 <*>">="         { return DT_GE; };
 261 <*>"=="         { return DT_EQ; };
 262 <*>"!="         { return DT_NE; };
 263 <*>"&&"         { return DT_AND; };
 264 <*>"||"         { return DT_OR; };
 265
 266 <*>.            {
 267                         DPRINT("Char: %c (\\x%02x)\n", yytext[0],
 268                                 (unsigned)yytext[0]);
 269                         if (yytext[0] == '[') {
 270                                 DPRINT("<BYTESTRING>\n");
 271                                 BEGIN(BYTESTRING);
 272                         }
 273                         if ((yytext[0] == '{')
 274                             || (yytext[0] == ';')) {
 275                                 DPRINT("<PROPNODENAME>\n");
 276                                 BEGIN(PROPNODENAME);
 277                         }
 278                         return yytext[0];
 279                 }
 280
 281 %%
 282
 283 static void push_input_file(const char *filename)
 284 {
 285         assert(filename);
 286
 287         assert(include_stack_pointer < MAX_INCLUDE_NESTING);
 288
 289         srcfile_push(filename);
 290
 291         yyin = current_srcfile->f;
 292
 293         include_stack[include_stack_pointer++] = YY_CURRENT_BUFFER;
 294
 295         yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
 296 }
 297
 298
 299 static bool pop_input_file(void)
 300 {
 301         if (srcfile_pop() == 0)
 302                 return false;
 303
 304         assert(include_stack_pointer > 0);
 305
 306         yy_delete_buffer( YY_CURRENT_BUFFER );
 307
 308         yy_switch_to_buffer( include_stack[--include_stack_pointer] );
 309
 310         yyin = current_srcfile->f;
 311
 312         return true;
 313 }
 314
 315 static void lexical_error(const char *fmt, ...)
 316 {
 317         va_list ap;
 318
 319         va_start(ap, fmt);
 320         srcpos_verror(&yylloc, "Lexical error", fmt, ap);
 321         va_end(ap);
 322
 323         treesource_error = true;
 324 }