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