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 yylineno
  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 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 YYLTYPE yylloc;
  42
  43 #define YY_USER_ACTION \
  44         { \
  45                 yylloc.file = srcpos_file; \
  46                 yylloc.first_line = yylineno; \
  47         }
  48
  49 /*#define LEXDEBUG      1*/
  50
  51 #ifdef LEXDEBUG
  52 #define DPRINT(fmt, ...)        fprintf(stderr, fmt, ##__VA_ARGS__)
  53 #else
  54 #define DPRINT(fmt, ...)        do { } while (0)
  55 #endif
  56
  57 static int dts_version = 1;
  58
  59 #define BEGIN_DEFAULT()         DPRINT("<V1>\n"); \
  60                                 BEGIN(V1); \
  61
  62 static void push_input_file(const char *filename);
  63 static int pop_input_file(void);
  64 %}
  65
  66 %%
  67 <*>"/include/"{WS}*{STRING} {
  68                         char *name = strchr(yytext, '\"') + 1;
  69                         yytext[yyleng-1] = '\0';
  70                         push_input_file(name);
  71                 }
  72
  73 <*><<EOF>>              {
  74                         if (!pop_input_file()) {
  75                                 yyterminate();
  76                         }
  77                 }
  78
  79 <*>{STRING}     {
  80                         DPRINT("String: %s\n", yytext);
  81                         yylval.data = data_copy_escape_string(yytext+1,
  82                                         yyleng-2);
  83                         return DT_STRING;
  84                 }
  85
  86 <*>"/dts-v1/"   {
  87                         DPRINT("Keyword: /dts-v1/\n");
  88                         dts_version = 1;
  89                         BEGIN_DEFAULT();
  90                         return DT_V1;
  91                 }
  92
  93 <*>"/memreserve/"       {
  94                         DPRINT("Keyword: /memreserve/\n");
  95                         BEGIN_DEFAULT();
  96                         return DT_MEMRESERVE;
  97                 }
  98
  99 <*>{LABEL}:     {
 100                         DPRINT("Label: %s\n", yytext);
 101                         yylval.labelref = xstrdup(yytext);
 102                         yylval.labelref[yyleng-1] = '\0';
 103                         return DT_LABEL;
 104                 }
 105
 106 <V1>[0-9]+|0[xX][0-9a-fA-F]+      {
 107                         yylval.literal = xstrdup(yytext);
 108                         DPRINT("Literal: '%s'\n", yylval.literal);
 109                         return DT_LITERAL;
 110                 }
 111
 112 \&{LABEL}       {       /* label reference */
 113                         DPRINT("Ref: %s\n", yytext+1);
 114                         yylval.labelref = xstrdup(yytext+1);
 115                         return DT_REF;
 116                 }
 117
 118 "&{/"{PATHCHAR}+\}      {       /* new-style path reference */
 119                         yytext[yyleng-1] = '\0';
 120                         DPRINT("Ref: %s\n", yytext+2);
 121                         yylval.labelref = xstrdup(yytext+2);
 122                         return DT_REF;
 123                 }
 124
 125 <BYTESTRING>[0-9a-fA-F]{2} {
 126                         yylval.byte = strtol(yytext, NULL, 16);
 127                         DPRINT("Byte: %02x\n", (int)yylval.byte);
 128                         return DT_BYTE;
 129                 }
 130
 131 <BYTESTRING>"]" {
 132                         DPRINT("/BYTESTRING\n");
 133                         BEGIN_DEFAULT();
 134                         return ']';
 135                 }
 136
 137 <PROPNODENAME>{PROPNODECHAR}+ {
 138                         DPRINT("PropNodeName: %s\n", yytext);
 139                         yylval.propnodename = xstrdup(yytext);
 140                         BEGIN_DEFAULT();
 141                         return DT_PROPNODENAME;
 142                 }
 143
 144 "/incbin/"      {
 145                         DPRINT("Binary Include\n");
 146                         return DT_INCBIN;
 147                 }
 148
 149 <*>{WS}+        /* eat whitespace */
 150 <*>{COMMENT}+   /* eat C-style comments */
 151 <*>{LINECOMMENT}+ /* eat C++-style comments */
 152
 153 <*>.            {
 154                         DPRINT("Char: %c (\\x%02x)\n", yytext[0],
 155                                 (unsigned)yytext[0]);
 156                         if (yytext[0] == '[') {
 157                                 DPRINT("<BYTESTRING>\n");
 158                                 BEGIN(BYTESTRING);
 159                         }
 160                         if ((yytext[0] == '{')
 161                             || (yytext[0] == ';')) {
 162                                 DPRINT("<PROPNODENAME>\n");
 163                                 BEGIN(PROPNODENAME);
 164                         }
 165                         return yytext[0];
 166                 }
 167
 168 %%
 169
 170
 171 /*
 172  * Stack of nested include file contexts.
 173  */
 174
 175 struct incl_file {
 176         struct dtc_file *file;
 177         YY_BUFFER_STATE yy_prev_buf;
 178         int yy_prev_lineno;
 179         struct incl_file *prev;
 180 };
 181
 182 static struct incl_file *incl_file_stack;
 183
 184
 185 /*
 186  * Detect infinite include recursion.
 187  */
 188 #define MAX_INCLUDE_DEPTH       (100)
 189
 190 static int incl_depth = 0;
 191
 192
 193 static void push_input_file(const char *filename)
 194 {
 195         struct incl_file *incl_file;
 196         struct dtc_file *newfile;
 197         struct search_path search, *searchptr = NULL;
 198
 199         assert(filename);
 200
 201         if (incl_depth++ >= MAX_INCLUDE_DEPTH)
 202                 die("Includes nested too deeply");
 203
 204         if (srcpos_file) {
 205                 search.dir = srcpos_file->dir;
 206                 search.next = NULL;
 207                 search.prev = NULL;
 208                 searchptr = &search;
 209         }
 210
 211         newfile = dtc_open_file(filename, searchptr);
 212
 213         incl_file = xmalloc(sizeof(struct incl_file));
 214
 215         /*
 216          * Save current context.
 217          */
 218         incl_file->yy_prev_buf = YY_CURRENT_BUFFER;
 219         incl_file->yy_prev_lineno = yylineno;
 220         incl_file->file = srcpos_file;
 221         incl_file->prev = incl_file_stack;
 222
 223         incl_file_stack = incl_file;
 224
 225         /*
 226          * Establish new context.
 227          */
 228         srcpos_file = newfile;
 229         yylineno = 1;
 230         yyin = newfile->file;
 231         yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
 232 }
 233
 234
 235 static int pop_input_file(void)
 236 {
 237         struct incl_file *incl_file;
 238
 239         if (incl_file_stack == 0)
 240                 return 0;
 241
 242         dtc_close_file(srcpos_file);
 243
 244         /*
 245          * Pop.
 246          */
 247         --incl_depth;
 248         incl_file = incl_file_stack;
 249         incl_file_stack = incl_file->prev;
 250
 251         /*
 252          * Recover old context.
 253          */
 254         yy_delete_buffer(YY_CURRENT_BUFFER);
 255         yy_switch_to_buffer(incl_file->yy_prev_buf);
 256         yylineno = incl_file->yy_prev_lineno;
 257         srcpos_file = incl_file->file;
 258         yyin = incl_file->file ? incl_file->file->file : NULL;
 259
 260         /*
 261          * Free old state.
 262          */
 263         free(incl_file);
 264
 265         return 1;
 266 }