srcpos.c revision c0fa2e6d4e59e62f2e9f23db1a2d94532fa4ae98 
1/*
2 * Copyright 2007 Jon Loeliger, Freescale Semiconductor, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or (at your option) any later version.
8 *
9 *  This program is distributed in the hope that it will be useful,
10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 *  General Public License for more details.
13 *
14 *  You should have received a copy of the GNU General Public License
15 *  along with this program; if not, write to the Free Software
16 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
17 *                                                                   USA
18 */
19
20#define _GNU_SOURCE
21
22#include <stdio.h>
23
24#include "dtc.h"
25#include "srcpos.h"
26
27
28static char *dirname(const char *path)
29{
30	const char *slash = strrchr(path, '/');
31
32	if (slash) {
33		int len = slash - path;
34		char *dir = xmalloc(len + 1);
35
36		memcpy(dir, path, len);
37		dir[len] = '\0';
38		return dir;
39	}
40	return NULL;
41}
42
43struct srcfile_state *current_srcfile; /* = NULL */
44
45/* Detect infinite include recursion. */
46#define MAX_SRCFILE_DEPTH     (100)
47static int srcfile_depth; /* = 0 */
48
49FILE *srcfile_relative_open(const char *fname, char **fullnamep)
50{
51	FILE *f;
52	char *fullname;
53
54	if (streq(fname, "-")) {
55		f = stdin;
56		fullname = xstrdup("<stdin>");
57	} else {
58		if (!current_srcfile || !current_srcfile->dir
59		    || (fname[0] == '/'))
60			fullname = xstrdup(fname);
61		else
62			fullname = join_path(current_srcfile->dir, fname);
63
64		f = fopen(fullname, "r");
65		if (!f)
66			die("Couldn't open \"%s\": %s\n", fname,
67			    strerror(errno));
68	}
69
70	if (fullnamep)
71		*fullnamep = fullname;
72	else
73		free(fullname);
74
75	return f;
76}
77
78void srcfile_push(const char *fname)
79{
80	struct srcfile_state *srcfile;
81
82	if (srcfile_depth++ >= MAX_SRCFILE_DEPTH)
83		die("Includes nested too deeply");
84
85	srcfile = xmalloc(sizeof(*srcfile));
86
87	srcfile->f = srcfile_relative_open(fname, &srcfile->name);
88	srcfile->dir = dirname(srcfile->name);
89	srcfile->prev = current_srcfile;
90
91	srcfile->lineno = 1;
92	srcfile->colno = 1;
93
94	current_srcfile = srcfile;
95}
96
97int srcfile_pop(void)
98{
99	struct srcfile_state *srcfile = current_srcfile;
100
101	assert(srcfile);
102
103	current_srcfile = srcfile->prev;
104
105	if (fclose(srcfile->f))
106		die("Error closing \"%s\": %s\n", srcfile->name,
107		    strerror(errno));
108
109	/* FIXME: We allow the srcfile_state structure to leak,
110	 * because it could still be referenced from a location
111	 * variable being carried through the parser somewhere.  To
112	 * fix this we could either allocate all the files from a
113	 * table, or use a pool allocator. */
114
115	return current_srcfile ? 1 : 0;
116}
117
118/*
119 * The empty source position.
120 */
121
122struct srcpos srcpos_empty = {
123	.first_line = 0,
124	.first_column = 0,
125	.last_line = 0,
126	.last_column = 0,
127	.file = NULL,
128};
129
130#define TAB_SIZE      8
131
132void srcpos_update(struct srcpos *pos, const char *text, int len)
133{
134	int i;
135
136	pos->file = current_srcfile;
137
138	pos->first_line = current_srcfile->lineno;
139	pos->first_column = current_srcfile->colno;
140
141	for (i = 0; i < len; i++)
142		if (text[i] == '\n') {
143			current_srcfile->lineno++;
144			current_srcfile->colno = 1;
145		} else if (text[i] == '\t') {
146			current_srcfile->colno =
147				ALIGN(current_srcfile->colno, TAB_SIZE);
148		} else {
149			current_srcfile->colno++;
150		}
151
152	pos->last_line = current_srcfile->lineno;
153	pos->last_column = current_srcfile->colno;
154}
155
156struct srcpos *
157srcpos_copy(struct srcpos *pos)
158{
159	struct srcpos *pos_new;
160
161	pos_new = xmalloc(sizeof(struct srcpos));
162	memcpy(pos_new, pos, sizeof(struct srcpos));
163
164	return pos_new;
165}
166
167
168
169void
170srcpos_dump(struct srcpos *pos)
171{
172	printf("file        : \"%s\"\n",
173	       pos->file ? (char *) pos->file : "<no file>");
174	printf("first_line  : %d\n", pos->first_line);
175	printf("first_column: %d\n", pos->first_column);
176	printf("last_line   : %d\n", pos->last_line);
177	printf("last_column : %d\n", pos->last_column);
178	printf("file        : %s\n", pos->file->name);
179}
180
181
182char *
183srcpos_string(struct srcpos *pos)
184{
185	const char *fname = "<no-file>";
186	char *pos_str;
187	int rc;
188
189	if (pos)
190		fname = pos->file->name;
191
192
193	if (pos->first_line != pos->last_line)
194		rc = asprintf(&pos_str, "%s:%d.%d-%d.%d", fname,
195			      pos->first_line, pos->first_column,
196			      pos->last_line, pos->last_column);
197	else if (pos->first_column != pos->last_column)
198		rc = asprintf(&pos_str, "%s:%d.%d-%d", fname,
199			      pos->first_line, pos->first_column,
200			      pos->last_column);
201	else
202		rc = asprintf(&pos_str, "%s:%d.%d", fname,
203			      pos->first_line, pos->first_column);
204
205	if (rc == -1)
206		die("Couldn't allocate in srcpos string");
207
208	return pos_str;
209}
210
211void
212srcpos_verror(struct srcpos *pos, char const *fmt, va_list va)
213{
214       const char *srcstr;
215
216       srcstr = srcpos_string(pos);
217
218       fprintf(stdout, "Error: %s ", srcstr);
219       vfprintf(stdout, fmt, va);
220       fprintf(stdout, "\n");
221}
222
223void
224srcpos_error(struct srcpos *pos, char const *fmt, ...)
225{
226	va_list va;
227
228	va_start(va, fmt);
229	srcpos_verror(pos, fmt, va);
230	va_end(va);
231}
232
233
234void
235srcpos_warn(struct srcpos *pos, char const *fmt, ...)
236{
237	const char *srcstr;
238	va_list va;
239	va_start(va, fmt);
240
241	srcstr = srcpos_string(pos);
242
243	fprintf(stderr, "Warning: %s ", srcstr);
244	vfprintf(stderr, fmt, va);
245	fprintf(stderr, "\n");
246
247	va_end(va);
248}
249