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
|
/* Loading dynamic objects for GNU Make.
Copyright (C) 2012-2013 Free Software Foundation, Inc.
This file is part of GNU Make.
GNU Make 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 3 of the License, or (at your option) any later
version.
GNU Make 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, see <http://www.gnu.org/licenses/>. */
#include "makeint.h"
#if MAKE_LOAD
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <errno.h>
#define SYMBOL_EXTENSION "_gmk_setup"
#include "debug.h"
#include "filedef.h"
#include "variable.h"
struct load_list
{
struct load_list *next;
const char *name;
void *dlp;
};
static struct load_list *loaded_syms = NULL;
static load_func_t
load_object (const gmk_floc *flocp, int noerror,
const char *ldname, const char *symname)
{
static void *global_dl = NULL;
load_func_t symp;
if (! global_dl)
{
global_dl = dlopen (NULL, RTLD_NOW|RTLD_GLOBAL);
if (! global_dl)
fatal (flocp, _("Failed to open global symbol table: %s"), dlerror ());
}
symp = (load_func_t) dlsym (global_dl, symname);
if (! symp)
{
struct load_list *new;
void *dlp = NULL;
/* If the path has no "/", try the current directory first. */
if (! strchr (ldname, '/')
#ifdef HAVE_DOS_PATHS
&& ! strchr (ldname, '\\')
#endif
)
dlp = dlopen (concat (2, "./", ldname), RTLD_LAZY|RTLD_GLOBAL);
/* If we haven't opened it yet, try the default search path. */
if (! dlp)
dlp = dlopen (ldname, RTLD_LAZY|RTLD_GLOBAL);
/* Still no? Then fail. */
if (! dlp)
{
if (noerror)
DB (DB_BASIC, ("%s", dlerror ()));
else
error (flocp, "%s", dlerror ());
return NULL;
}
/* Assert that the GPL license symbol is defined. */
symp = (load_func_t) dlsym (dlp, "plugin_is_GPL_compatible");
if (! symp)
fatal (flocp, _("Loaded object %s is not declared to be GPL compatible"),
ldname);
symp = (load_func_t) dlsym (dlp, symname);
if (! symp)
fatal (flocp, _("Failed to load symbol %s from %s: %s"),
symname, ldname, dlerror ());
/* Add this symbol to a trivial lookup table. This is not efficient but
it's highly unlikely we'll be loading lots of objects, and we only
need it to look them up on unload, if we rebuild them. */
new = xmalloc (sizeof (struct load_list));
new->name = xstrdup (ldname);
new->dlp = dlp;
new->next = loaded_syms;
loaded_syms = new;
}
return symp;
}
int
load_file (const gmk_floc *flocp, const char **ldname, int noerror)
{
int nmlen = strlen (*ldname);
char *new = alloca (nmlen + CSTRLEN (SYMBOL_EXTENSION) + 1);
char *symname = NULL;
char *loaded;
const char *fp;
int r;
load_func_t symp;
/* Break the input into an object file name and a symbol name. If no symbol
name was provided, compute one from the object file name. */
fp = strchr (*ldname, '(');
if (fp)
{
const char *ep;
/* There's an open paren, so see if there's a close paren: if so use
that as the symbol name. We can't have whitespace: it would have
been chopped up before this function is called. */
ep = strchr (fp+1, ')');
if (ep && ep[1] == '\0')
{
int l = fp - *ldname;;
++fp;
if (fp == ep)
fatal (flocp, _("Empty symbol name for load: %s"), *ldname);
/* Make a copy of the ldname part. */
memcpy (new, *ldname, l);
new[l] = '\0';
*ldname = new;
/* Make a copy of the symbol name part. */
symname = new + l + 1;
memcpy (symname, fp, ep - fp);
symname[ep - fp] = '\0';
}
}
/* Add this name to the string cache so it can be reused later. */
*ldname = strcache_add (*ldname);
/* If this object has been loaded, we're done. */
loaded = allocated_variable_expand ("$(.LOADED)");
fp = strstr (loaded, *ldname);
r = fp && (fp==loaded || fp[-1]==' ') && (fp[nmlen]=='\0' || fp[nmlen]==' ');
free (loaded);
if (r)
return 1;
/* If we didn't find a symbol name yet, construct it from the ldname. */
if (! symname)
{
char *p = new;
fp = strrchr (*ldname, '/');
#ifdef HAVE_DOS_PATHS
if (fp)
{
const char *fp2 = strchr (fp, '\\');
if (fp2 > fp)
fp = fp2;
}
else
fp = strrchr (*ldname, '\\');
/* The (improbable) case of d:foo. */
if (fp && *fp && fp[1] == ':')
fp++;
#endif
if (!fp)
fp = *ldname;
else
++fp;
while (isalnum (*fp) || *fp == '_')
*(p++) = *(fp++);
strcpy (p, SYMBOL_EXTENSION);
symname = new;
}
DB (DB_VERBOSE, (_("Loading symbol %s from %s\n"), symname, *ldname));
/* Load it! */
symp = load_object (flocp, noerror, *ldname, symname);
if (! symp)
return 0;
/* Invoke the symbol. */
r = (*symp) (flocp);
/* If it succeeded, add the load file to the loaded variable. */
if (r > 0)
do_variable_definition (flocp, ".LOADED", *ldname, o_default, f_append, 0);
return r;
}
void
unload_file (const char *name)
{
struct load_list *d;
for (d = loaded_syms; d != NULL; d = d->next)
if (streq (d->name, name) && d->dlp)
{
if (dlclose (d->dlp))
perror_with_name ("dlclose", d->name);
d->dlp = NULL;
break;
}
}
#else
int
load_file (const gmk_floc *flocp, const char **ldname, int noerror)
{
if (! noerror)
fatal (flocp, _("The 'load' operation is not supported on this platform."));
return 0;
}
void
unload_file (const char *name)
{
fatal (NILF, "INTERNAL: Cannot unload when load is not supported!");
}
#endif /* MAKE_LOAD */
|
