kernel/scripts/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 INCLUDE
  24 %x BYTESTRING
  25 %x PROPNODENAME
  26 %s V1
  27
  28 PROPNODECHAR    [a-zA-Z0-9,._+*#?@-]
  29 PATHCHAR        ({PROPNODECHAR}|[/])
  30 LABEL           [a-zA-Z_][a-zA-Z0-9_]*
  31 STRING          \"([^\\"]|\\.)*\"
  32 CHAR_LITERAL    '([^']|\\')*'
  33 WS              [[:space:]]
  34 COMMENT         "/*"([^*]|\*+[^*/])*\*+"/"
  35 LINECOMMENT     "//".*\n
  36
  37 %{
  38 #include "dtc.h"
  39 #include "srcpos.h"
  40 #include "dtc-parser.tab.h"
  41
  42 YYLTYPE yylloc;
  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 int pop_input_file(void);
  65 %}
  66
  67 %%
  68 <*>"/include/"{WS}*{STRING} {
  69                         char *name = strchr(yytext, '\"') + 1;
  70                         yytext[yyleng-1] = '\0';
  71                         push_input_file(name);
  72                 }
  73
  74 <*>^"#"(line)?[ \t]+[0-9]+[ \t]+{STRING}([ \t]+[0-9]+)? {
  75                         char *line, *tmp, *fn;
  76                         /* skip text before line # */
  77                         line = yytext;
  78                         while (!isdigit(*line))
  79                                 line++;
  80                         /* skip digits in line # */
  81                         tmp = line;
  82                         while (!isspace(*tmp))
  83                                 tmp++;
  84                         /* "NULL"-terminate line # */
  85                         *tmp = '\0';
  86                         /* start of filename */
  87                         fn = strchr(tmp + 1, '"') + 1;
  88                         /* strip trailing " from filename */
  89                         tmp = strchr(fn, '"');
  90                         *tmp = 0;
  91                         /* -1 since #line is the number of the next line */
  92                         srcpos_set_line(xstrdup(fn), atoi(line) - 1);
  93                 }
  94
  95 <*><<EOF>>              {
  96                         if (!pop_input_file()) {
  97                                 yyterminate();
  98                         }
  99                 }
 100
 101 <*>{STRING}     {
 102                         DPRINT("String: %s\n", yytext);
 103                         yylval.data = data_copy_escape_string(yytext+1,
 104                                         yyleng-2);
 105                         return DT_STRING;
 106                 }
 107
 108 <*>"/dts-v1/"   {
 109                         DPRINT("Keyword: /dts-v1/\n");
 110                         dts_version = 1;
 111                         BEGIN_DEFAULT();
 112                         return DT_V1;
 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 <*>{LABEL}:     {
 142                         DPRINT("Label: %s\n", yytext);
 143                         yylval.labelref = xstrdup(yytext);
 144                         yylval.labelref[yyleng-1] = '\0';
 145                         return DT_LABEL;
 146                 }
 147
 148 <V1>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? {
 149                         yylval.literal = xstrdup(yytext);
 150                         DPRINT("Literal: '%s'\n", yylval.literal);
 151                         return DT_LITERAL;
 152                 }
 153
 154 <*>{CHAR_LITERAL}       {
 155                         yytext[yyleng-1] = '\0';
 156                         yylval.literal = xstrdup(yytext+1);
 157                         DPRINT("Character literal: %s\n", yylval.literal);
 158                         return DT_CHAR_LITERAL;
 159                 }
 160
 161 <*>\&{LABEL}    {       /* label reference */
 162                         DPRINT("Ref: %s\n", yytext+1);
 163                         yylval.labelref = xstrdup(yytext+1);
 164                         return DT_REF;
 165                 }
 166
 167 <*>"&{/"{PATHCHAR}+\}   {       /* new-style path reference */
 168                         yytext[yyleng-1] = '\0';
 169                         DPRINT("Ref: %s\n", yytext+2);
 170                         yylval.labelref = xstrdup(yytext+2);
 171                         return DT_REF;
 172                 }
 173
 174 <BYTESTRING>[0-9a-fA-F]{2} {
 175                         yylval.byte = strtol(yytext, NULL, 16);
 176                         DPRINT("Byte: %02x\n", (int)yylval.byte);
 177                         return DT_BYTE;
 178                 }
 179
 180 <BYTESTRING>"]" {
 181                         DPRINT("/BYTESTRING\n");
 182                         BEGIN_DEFAULT();
 183                         return ']';
 184                 }
 185
 186 <PROPNODENAME>\\?{PROPNODECHAR}+ {
 187                         DPRINT("PropNodeName: %s\n", yytext);
 188                         yylval.propnodename = xstrdup((yytext[0] == '\\') ?
 189                                                         yytext + 1 : yytext);
 190                         BEGIN_DEFAULT();
 191                         return DT_PROPNODENAME;
 192                 }
 193
 194 "/incbin/"      {
 195                         DPRINT("Binary Include\n");
 196                         return DT_INCBIN;
 197                 }
 198
 199 <*>{WS}+        /* eat whitespace */
 200 <*>{COMMENT}+   /* eat C-style comments */
 201 <*>{LINECOMMENT}+ /* eat C++-style comments */
 202
 203 <*>"<<"         { return DT_LSHIFT; };
 204 <*>">>"         { return DT_RSHIFT; };
 205 <*>"<="         { return DT_LE; };
 206 <*>">="         { return DT_GE; };
 207 <*>"=="         { return DT_EQ; };
 208 <*>"!="         { return DT_NE; };
 209 <*>"&&"         { return DT_AND; };
 210 <*>"||"         { return DT_OR; };
 211
 212 <*>.            {
 213                         DPRINT("Char: %c (\\x%02x)\n", yytext[0],
 214                                 (unsigned)yytext[0]);
 215                         if (yytext[0] == '[') {
 216                                 DPRINT("<BYTESTRING>\n");
 217                                 BEGIN(BYTESTRING);
 218                         }
 219                         if ((yytext[0] == '{')
 220                             || (yytext[0] == ';')) {
 221                                 DPRINT("<PROPNODENAME>\n");
 222                                 BEGIN(PROPNODENAME);
 223                         }
 224                         return yytext[0];
 225                 }
 226
 227 %%
 228
 229 static void push_input_file(const char *filename)
 230 {
 231         assert(filename);
 232
 233         srcfile_push(filename);
 234
 235         yyin = current_srcfile->f;
 236
 237         yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE));
 238 }
 239
 240
 241 static int pop_input_file(void)
 242 {
 243         if (srcfile_pop() == 0)
 244                 return 0;
 245
 246         yypop_buffer_state();
 247         yyin = current_srcfile->f;
 248
 249         return 1;
 250 }