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 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 #define MAX_INCLUDE_NESTING 100
  43 YY_BUFFER_STATE include_stack[MAX_INCLUDE_NESTING];
  44 int include_stack_pointer = 0;
  45
  46 YYLTYPE yylloc;
  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 int pop_input_file(void);
  69 %}
  70
  71 %%
  72 <*>"/include/"{WS}*{STRING} {
  73                         char *name = strchr(yytext, '\"') + 1;
  74                         yytext[yyleng-1] = '\0';
  75                         push_input_file(name);
  76                 }
  77
  78 <*><<EOF>>              {
  79                         if (!pop_input_file()) {
  80                                 yyterminate();
  81                         }
  82                 }
  83
  84 <*>{STRING}     {
  85                         DPRINT("String: %s\n", yytext);
  86                         yylval.data = data_copy_escape_string(yytext+1,
  87                                         yyleng-2);
  88                         return DT_STRING;
  89                 }
  90
  91 <*>"/dts-v1/"   {
  92                         DPRINT("Keyword: /dts-v1/\n");
  93                         dts_version = 1;
  94                         BEGIN_DEFAULT();
  95                         return DT_V1;
  96                 }
  97
  98 <*>"/memreserve/"       {
  99                         DPRINT("Keyword: /memreserve/\n");
 100                         BEGIN_DEFAULT();
 101                         return DT_MEMRESERVE;
 102                 }
 103
 104 <*>"/bits/"     {
 105                         DPRINT("Keyword: /bits/\n");
 106                         BEGIN_DEFAULT();
 107                         return DT_BITS;
 108                 }
 109
 110 <*>{LABEL}:     {
 111                         DPRINT("Label: %s\n", yytext);
 112                         yylval.labelref = xstrdup(yytext);
 113                         yylval.labelref[yyleng-1] = '\0';
 114                         return DT_LABEL;
 115                 }
 116
 117 <V1>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? {
 118                         yylval.literal = xstrdup(yytext);
 119                         DPRINT("Literal: '%s'\n", yylval.literal);
 120                         return DT_LITERAL;
 121                 }
 122
 123 <*>{CHAR_LITERAL}       {
 124                         yytext[yyleng-1] = '\0';
 125                         yylval.literal = xstrdup(yytext+1);
 126                         DPRINT("Character literal: %s\n", yylval.literal);
 127                         return DT_CHAR_LITERAL;
 128                 }
 129
 130 <*>\&{LABEL}    {       /* label reference */
 131                         DPRINT("Ref: %s\n", yytext+1);
 132                         yylval.labelref = xstrdup(yytext+1);
 133                         return DT_REF;
 134                 }
 135
 136 <*>"&{/"{PATHCHAR}+\}   {       /* new-style path reference */
 137                         yytext[yyleng-1] = '\0';
 138                         DPRINT("Ref: %s\n", yytext+2);
 139                         yylval.labelref = xstrdup(yytext+2);
 140                         return DT_REF;
 141                 }
 142
 143 <BYTESTRING>[0-9a-fA-F]{2} {
 144                         yylval.byte = strtol(yytext, NULL, 16);
 145                         DPRINT("Byte: %02x\n", (int)yylval.byte);
 146                         return DT_BYTE;
 147                 }
 148
 149 <BYTESTRING>"]" {
 150                         DPRINT("/BYTESTRING\n");
 151                         BEGIN_DEFAULT();
 152                         return ']';
 153                 }
 154
 155 <PROPNODENAME>{PROPNODECHAR}+ {
 156                         DPRINT("PropNodeName: %s\n", yytext);
 157                         yylval.propnodename = xstrdup(yytext);
 158                         BEGIN_DEFAULT();
 159                         return DT_PROPNODENAME;
 160                 }
 161
 162 "/incbin/"      {
 163                         DPRINT("Binary Include\n");
 164                         return DT_INCBIN;
 165                 }
 166
 167 <*>{WS}+        /* eat whitespace */
 168 <*>{COMMENT}+   /* eat C-style comments */
 169 <*>{LINECOMMENT}+ /* eat C++-style comments */
 170
 171 <*>"<<"         { return DT_LSHIFT; };
 172 <*>">>"         { return DT_RSHIFT; };
 173 <*>"<="         { return DT_LE; };
 174 <*>">="         { return DT_GE; };
 175 <*>"=="         { return DT_EQ; };
 176 <*>"!="         { return DT_NE; };
 177 <*>"&&"         { return DT_AND; };
 178 <*>"||"         { return DT_OR; };
 179
 180 <*>.            {
 181                         DPRINT("Char: %c (\\x%02x)\n", yytext[0],
 182                                 (unsigned)yytext[0]);
 183                         if (yytext[0] == '[') {
 184                                 DPRINT("<BYTESTRING>\n");
 185                                 BEGIN(BYTESTRING);
 186                         }
 187                         if ((yytext[0] == '{')
 188                             || (yytext[0] == ';')) {
 189                                 DPRINT("<PROPNODENAME>\n");
 190                                 BEGIN(PROPNODENAME);
 191                         }
 192                         return yytext[0];
 193                 }
 194
 195 %%
 196
 197 static void push_input_file(const char *filename)
 198 {
 199         assert(filename);
 200
 201         assert(include_stack_pointer < MAX_INCLUDE_NESTING);
 202
 203         srcfile_push(filename);
 204
 205         yyin = current_srcfile->f;
 206
 207         include_stack[include_stack_pointer++] = YY_CURRENT_BUFFER;
 208
 209         yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
 210 }
 211
 212
 213 static int pop_input_file(void)
 214 {
 215         if (srcfile_pop() == 0)
 216                 return 0;
 217
 218         assert(include_stack_pointer > 0);
 219
 220         yy_delete_buffer( YY_CURRENT_BUFFER );
 221
 222         yy_switch_to_buffer( include_stack[--include_stack_pointer] );
 223
 224         yyin = current_srcfile->f;
 225
 226         return 1;
 227 }