1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation. 2005.
4 */
5
6 %option noyywrap nounput noinput never-interactive
7
8 %x BYTESTRING
9 %x PROPNODENAME
10 %s V1
11
12 PROPNODECHAR [a-zA-Z0-9,._+*#?@-]
13 PATHCHAR ({PROPNODECHAR}|[/])
14 LABEL [a-zA-Z_][a-zA-Z0-9_]*
15 STRING \"([^\\"]|\\.)*\"
16 CHAR_LITERAL '([^']|\\')*'
17 WS [[:space:]]
18 COMMENT "/*"([^*]|\*+[^*/])*\*+"/"
19 LINECOMMENT "//".*\n
20
21 %{
22 #include "dtc.h"
23 #include "srcpos.h"
24 #include "dtc-parser.tab.h"
25
26 extern bool treesource_error;
27
28 /* CAUTION: this will stop working if we ever use yyless() or yyunput() */
29 #define YY_USER_ACTION \
30 { \
31 srcpos_update(&yylloc, yytext, yyleng); \
32 }
33
34 /*#define LEXDEBUG 1*/
35
36 #ifdef LEXDEBUG
37 #define DPRINT(fmt, ...) fprintf(stderr, fmt, ##__VA_ARGS__)
38 #else
39 #define DPRINT(fmt, ...) do { } while (0)
40 #endif
41
42 static int dts_version = 1;
43
44 #define BEGIN_DEFAULT() DPRINT("<V1>\n"); \
45 BEGIN(V1); \
46
47 static void push_input_file(const char *filename);
48 static bool pop_input_file(void);
49 static void PRINTF(1, 2) lexical_error(const char *fmt, ...);
50
51 %}
52
53 %%
54 <*>"/include/"{WS}*{STRING} {
55 char *name = strchr(yytext, '\"') + 1;
56 yytext[yyleng-1] = '\0';
57 push_input_file(name);
58 }
59
60 <*>^"#"(line)?[ \t]+[0-9]+[ \t]+{STRING}([ \t]+[0-9]+)* {
61 char *line, *fnstart, *fnend;
62 struct data fn;
63 /* skip text before line # */
64 line = yytext;
65 while (!isdigit((unsigned char)*line))
66 line++;
67
68 /* regexp ensures that first and list "
69 * in the whole yytext are those at
70 * beginning and end of the filename string */
71 fnstart = memchr(yytext, '"', yyleng);
72 for (fnend = yytext + yyleng - 1;
73 *fnend != '"'; fnend--)
74 ;
75 assert(fnstart && fnend && (fnend > fnstart));
76
77 fn = data_copy_escape_string(fnstart + 1,
78 fnend - fnstart - 1);
79
80 /* Don't allow nuls in filenames */
81 if (memchr(fn.val, '\0', fn.len - 1))
82 lexical_error("nul in line number directive");
83
84 /* -1 since #line is the number of the next line */
85 srcpos_set_line(xstrdup(fn.val), atoi(line) - 1);
86 data_free(fn);
87 }
88
89 <*><<EOF>> {
90 if (!pop_input_file()) {
91 yyterminate();
92 }
93 }
94
95 <*>{STRING} {
96 DPRINT("String: %s\n", yytext);
97 yylval.data = data_copy_escape_string(yytext+1,
98 yyleng-2);
99 return DT_STRING;
100 }
101
102 <*>"/dts-v1/" {
103 DPRINT("Keyword: /dts-v1/\n");
104 dts_version = 1;
105 BEGIN_DEFAULT();
106 return DT_V1;
107 }
108
109 <*>"/plugin/" {
110 DPRINT("Keyword: /plugin/\n");
111 return DT_PLUGIN;
112 }
113
114 <*>"/memreserve/" {
115 DPRINT("Keyword: /memreserve/\n");
116 BEGIN_DEFAULT();
117 return DT_MEMRESERVE;
118 }
119
120 <*>"/bits/" {
121 DPRINT("Keyword: /bits/\n");
122 BEGIN_DEFAULT();
123 return DT_BITS;
124 }
125
126 <*>"/delete-property/" {
127 DPRINT("Keyword: /delete-property/\n");
128 DPRINT("<PROPNODENAME>\n");
129 BEGIN(PROPNODENAME);
130 return DT_DEL_PROP;
131 }
132
133 <*>"/delete-node/" {
134 DPRINT("Keyword: /delete-node/\n");
135 DPRINT("<PROPNODENAME>\n");
136 BEGIN(PROPNODENAME);
137 return DT_DEL_NODE;
138 }
139
140 <*>"/omit-if-no-ref/" {
141 DPRINT("Keyword: /omit-if-no-ref/\n");
142 DPRINT("<PROPNODENAME>\n");
143 BEGIN(PROPNODENAME);
144 return DT_OMIT_NO_REF;
145 }
146
147 <*>{LABEL}: {
148 DPRINT("Label: %s\n", yytext);
149 yylval.labelref = xstrdup(yytext);
150 yylval.labelref[yyleng-1] = '\0';
151 return DT_LABEL;
152 }
153
154 <V1>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? {
155 char *e;
156 DPRINT("Integer Literal: '%s'\n", yytext);
157
158 errno = 0;
159 yylval.integer = strtoull(yytext, &e, 0);
160
161 if (*e && e[strspn(e, "UL")]) {
162 lexical_error("Bad integer literal '%s'",
163 yytext);
164 }
165
166 if (errno == ERANGE)
167 lexical_error("Integer literal '%s' out of range",
168 yytext);
169 else
170 /* ERANGE is the only strtoull error triggerable
171 * by strings matching the pattern */
172 assert(errno == 0);
173 return DT_LITERAL;
174 }
175
176 <*>{CHAR_LITERAL} {
177 struct data d;
178 DPRINT("Character literal: %s\n", yytext);
179
180 d = data_copy_escape_string(yytext+1, yyleng-2);
181 if (d.len == 1) {
182 lexical_error("Empty character literal");
183 yylval.integer = 0;
184 } else {
185 yylval.integer = (unsigned char)d.val[0];
186
187 if (d.len > 2)
188 lexical_error("Character literal has %d"
189 " characters instead of 1",
190 d.len - 1);
191 }
192
193 data_free(d);
194 return DT_CHAR_LITERAL;
195 }
196
197 <*>\&{LABEL} { /* label reference */
198 DPRINT("Ref: %s\n", yytext+1);
199 yylval.labelref = xstrdup(yytext+1);
200 return DT_LABEL_REF;
201 }
202
203 <*>"&{"{PATHCHAR}*\} { /* new-style path reference */
204 yytext[yyleng-1] = '\0';
205 DPRINT("Ref: %s\n", yytext+2);
206 yylval.labelref = xstrdup(yytext+2);
207 return DT_PATH_REF;
208 }
209
210 <BYTESTRING>[0-9a-fA-F]{2} {
211 yylval.byte = strtol(yytext, NULL, 16);
212 DPRINT("Byte: %02x\n", (int)yylval.byte);
213 return DT_BYTE;
214 }
215
216 <BYTESTRING>"]" {
217 DPRINT("/BYTESTRING\n");
218 BEGIN_DEFAULT();
219 return ']';
220 }
221
222 <PROPNODENAME>\\?{PROPNODECHAR}+ {
223 DPRINT("PropNodeName: %s\n", yytext);
224 yylval.propnodename = xstrdup((yytext[0] == '\\') ?
225 yytext + 1 : yytext);
226 BEGIN_DEFAULT();
227 return DT_PROPNODENAME;
228 }
229
230 "/incbin/" {
231 DPRINT("Binary Include\n");
232 return DT_INCBIN;
233 }
234
235 <*>{WS}+ /* eat whitespace */
236 <*>{COMMENT}+ /* eat C-style comments */
237 <*>{LINECOMMENT}+ /* eat C++-style comments */
238
239 <*>"<<" { return DT_LSHIFT; };
240 <*>">>" { return DT_RSHIFT; };
241 <*>"<=" { return DT_LE; };
242 <*>">=" { return DT_GE; };
243 <*>"==" { return DT_EQ; };
244 <*>"!=" { return DT_NE; };
245 <*>"&&" { return DT_AND; };
246 <*>"||" { return DT_OR; };
247
248 <*>. {
249 DPRINT("Char: %c (\\x%02x)\n", yytext[0],
250 (unsigned)yytext[0]);
251 if (yytext[0] == '[') {
252 DPRINT("<BYTESTRING>\n");
253 BEGIN(BYTESTRING);
254 }
255 if ((yytext[0] == '{')
256 || (yytext[0] == ';')) {
257 DPRINT("<PROPNODENAME>\n");
258 BEGIN(PROPNODENAME);
259 }
260 return yytext[0];
261 }
262
263 %%
264
265 static void push_input_file(const char *filename)
266 {
267 assert(filename);
268
269 srcfile_push(filename);
270
271 yyin = current_srcfile->f;
272
273 yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE));
274 }
275
276
277 static bool pop_input_file(void)
278 {
279 if (srcfile_pop() == 0)
280 return false;
281
282 yypop_buffer_state();
283 yyin = current_srcfile->f;
284
285 return true;
286 }
287
288 static void lexical_error(const char *fmt, ...)
289 {
290 va_list ap;
291
292 va_start(ap, fmt);
293 srcpos_verror(&yylloc, "Lexical error", fmt, ap);
294 va_end(ap);
295
296 treesource_error = true;
297 }
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