summaryrefslogtreecommitdiffstats
path: root/kernel/scripts/dtc/dtc-lexer.l
blob: 0ee1caf03dd057bee8c212002568941f0658edd7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *                                                                   USA
 */

%option noyywrap nounput noinput never-interactive

%x BYTESTRING
%x PROPNODENAME
%s V1

PROPNODECHAR	[a-zA-Z0-9,._+*#?@-]
PATHCHAR	({PROPNODECHAR}|[/])
LABEL		[a-zA-Z_][a-zA-Z0-9_]*
STRING		\"([^\\"]|\\.)*\"
CHAR_LITERAL	'([^']|\\')*'
WS		[[:space:]]
COMMENT		"/*"([^*]|\*+[^*/])*\*+"/"
LINECOMMENT	"//".*\n

%{
#include "dtc.h"
#include "srcpos.h"
#include "dtc-parser.tab.h"

YYLTYPE yylloc;
extern bool treesource_error;

/* CAUTION: this will stop working if we ever use yyless() or yyunput() */
#define	YY_USER_ACTION \
	{ \
		srcpos_update(&yylloc, yytext, yyleng); \
	}

/*#define LEXDEBUG	1*/

#ifdef LEXDEBUG
#define DPRINT(fmt, ...)	fprintf(stderr, fmt, ##__VA_ARGS__)
#else
#define DPRINT(fmt, ...)	do { } while (0)
#endif

static int dts_version = 1;

#define BEGIN_DEFAULT()		DPRINT("<V1>\n"); \
				BEGIN(V1); \

static void push_input_file(const char *filename);
static bool pop_input_file(void);
static void lexical_error(const char *fmt, ...);
%}

%%
<*>"/include/"{WS}*{STRING} {
			char *name = strchr(yytext, '\"') + 1;
			yytext[yyleng-1] = '\0';
			push_input_file(name);
		}

<*>^"#"(line)?[ \t]+[0-9]+[ \t]+{STRING}([ \t]+[0-9]+)? {
			char *line, *tmp, *fn;
			/* skip text before line # */
			line = yytext;
			while (!isdigit((unsigned char)*line))
				line++;
			/* skip digits in line # */
			tmp = line;
			while (!isspace((unsigned char)*tmp))
				tmp++;
			/* "NULL"-terminate line # */
			*tmp = '\0';
			/* start of filename */
			fn = strchr(tmp + 1, '"') + 1;
			/* strip trailing " from filename */
			tmp = strchr(fn, '"');
			*tmp = 0;
			/* -1 since #line is the number of the next line */
			srcpos_set_line(xstrdup(fn), atoi(line) - 1);
		}

<*><<EOF>>		{
			if (!pop_input_file()) {
				yyterminate();
			}
		}

<*>{STRING}	{
			DPRINT("String: %s\n", yytext);
			yylval.data = data_copy_escape_string(yytext+1,
					yyleng-2);
			return DT_STRING;
		}

<*>"/dts-v1/"	{
			DPRINT("Keyword: /dts-v1/\n");
			dts_version = 1;
			BEGIN_DEFAULT();
			return DT_V1;
		}

<*>"/memreserve/"	{
			DPRINT("Keyword: /memreserve/\n");
			BEGIN_DEFAULT();
			return DT_MEMRESERVE;
		}

<*>"/bits/"	{
			DPRINT("Keyword: /bits/\n");
			BEGIN_DEFAULT();
			return DT_BITS;
		}

<*>"/delete-property/"	{
			DPRINT("Keyword: /delete-property/\n");
			DPRINT("<PROPNODENAME>\n");
			BEGIN(PROPNODENAME);
			return DT_DEL_PROP;
		}

<*>"/delete-node/"	{
			DPRINT("Keyword: /delete-node/\n");
			DPRINT("<PROPNODENAME>\n");
			BEGIN(PROPNODENAME);
			return DT_DEL_NODE;
		}

<*>{LABEL}:	{
			DPRINT("Label: %s\n", yytext);
			yylval.labelref = xstrdup(yytext);
			yylval.labelref[yyleng-1] = '\0';
			return DT_LABEL;
		}

<V1>([0-9]+|0[xX][0-9a-fA-F]+)(U|L|UL|LL|ULL)? {
			char *e;
			DPRINT("Integer Literal: '%s'\n", yytext);

			errno = 0;
			yylval.integer = strtoull(yytext, &e, 0);

			assert(!(*e) || !e[strspn(e, "UL")]);

			if (errno == ERANGE)
				lexical_error("Integer literal '%s' out of range",
					      yytext);
			else
				/* ERANGE is the only strtoull error triggerable
				 *  by strings matching the pattern */
				assert(errno == 0);
			return DT_LITERAL;
		}

<*>{CHAR_LITERAL}	{
			struct data d;
			DPRINT("Character literal: %s\n", yytext);

			d = data_copy_escape_string(yytext+1, yyleng-2);
			if (d.len == 1) {
				lexical_error("Empty character literal");
				yylval.integer = 0;
				return DT_CHAR_LITERAL;
			}

			yylval.integer = (unsigned char)d.val[0];

			if (d.len > 2)
				lexical_error("Character literal has %d"
					      " characters instead of 1",
					      d.len - 1);

			return DT_CHAR_LITERAL;
		}

<*>\&{LABEL}	{	/* label reference */
			DPRINT("Ref: %s\n", yytext+1);
			yylval.labelref = xstrdup(yytext+1);
			return DT_REF;
		}

<*>"&{/"{PATHCHAR}*\}	{	/* new-style path reference */
			yytext[yyleng-1] = '\0';
			DPRINT("Ref: %s\n", yytext+2);
			yylval.labelref = xstrdup(yytext+2);
			return DT_REF;
		}

<BYTESTRING>[0-9a-fA-F]{2} {
			yylval.byte = strtol(yytext, NULL, 16);
			DPRINT("Byte: %02x\n", (int)yylval.byte);
			return DT_BYTE;
		}

<BYTESTRING>"]"	{
			DPRINT("/BYTESTRING\n");
			BEGIN_DEFAULT();
			return ']';
		}

<PROPNODENAME>\\?{PROPNODECHAR}+ {
			DPRINT("PropNodeName: %s\n", yytext);
			yylval.propnodename = xstrdup((yytext[0] == '\\') ?
							yytext + 1 : yytext);
			BEGIN_DEFAULT();
			return DT_PROPNODENAME;
		}

"/incbin/"	{
			DPRINT("Binary Include\n");
			return DT_INCBIN;
		}

<*>{WS}+	/* eat whitespace */
<*>{COMMENT}+	/* eat C-style comments */
<*>{LINECOMMENT}+ /* eat C++-style comments */

<*>"<<"		{ return DT_LSHIFT; };
<*>">>"		{ return DT_RSHIFT; };
<*>"<="		{ return DT_LE; };
<*>">="		{ return DT_GE; };
<*>"=="		{ return DT_EQ; };
<*>"!="		{ return DT_NE; };
<*>"&&"		{ return DT_AND; };
<*>"||"		{ return DT_OR; };

<*>.		{
			DPRINT("Char: %c (\\x%02x)\n", yytext[0],
				(unsigned)yytext[0]);
			if (yytext[0] == '[') {
				DPRINT("<BYTESTRING>\n");
				BEGIN(BYTESTRING);
			}
			if ((yytext[0] == '{')
			    || (yytext[0] == ';')) {
				DPRINT("<PROPNODENAME>\n");
				BEGIN(PROPNODENAME);
			}
			return yytext[0];
		}

%%

static void push_input_file(const char *filename)
{
	assert(filename);

	srcfile_push(filename);

	yyin = current_srcfile->f;

	yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE));
}


static bool pop_input_file(void)
{
	if (srcfile_pop() == 0)
		return false;

	yypop_buffer_state();
	yyin = current_srcfile->f;

	return true;
}

static void lexical_error(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	srcpos_verror(&yylloc, "Lexical error", fmt, ap);
	va_end(ap);

	treesource_error = true;
}