Root/scripts/dtc/dtc-lexer.l

Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago.
By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing
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
28PROPNODECHAR [a-zA-Z0-9,._+*#?@-]
29PATHCHAR ({PROPNODECHAR}|[/])
30LABEL [a-zA-Z_][a-zA-Z0-9_]*
31STRING \"([^\\"]|\\.)*\"
32WS [[:space:]]
33COMMENT "/*"([^*]|\*+[^*/])*\*+"/"
34LINECOMMENT "//".*\n
35
36%{
37#include "dtc.h"
38#include "srcpos.h"
39#include "dtc-parser.tab.h"
40
41YYLTYPE yylloc;
42
43/* CAUTION: this will stop working if we ever use yyless() or yyunput() */
44#define YY_USER_ACTION \
45    { \
46        srcpos_update(&yylloc, yytext, yyleng); \
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
57static int dts_version = 1;
58
59#define BEGIN_DEFAULT() DPRINT("<V1>\n"); \
60                BEGIN(V1); \
61
62static void push_input_file(const char *filename);
63static 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
170static void push_input_file(const char *filename)
171{
172    assert(filename);
173
174    srcfile_push(filename);
175
176    yyin = current_srcfile->f;
177
178    yypush_buffer_state(yy_create_buffer(yyin, YY_BUF_SIZE));
179}
180
181
182static int pop_input_file(void)
183{
184    if (srcfile_pop() == 0)
185        return 0;
186
187    yypop_buffer_state();
188    yyin = current_srcfile->f;
189
190    return 1;
191}
192

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