1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright 2018, Joyent, Inc.
25 */
26
27 #include <stdio.h>
28 #include <demangle-sys.h>
29 #include "_conv.h"
30 #include "demangle_msg.h"
31
32 /*
33 * Demangle C++ symbols.
34 *
35 * This routine acts as a generic routine for use by liblddbg (and hence tools
36 * like elfdump(1) and pvs(1)), ld(1) and ld.so.1(1).
37 *
38 * The C++ ABI-2 places no limits on symbol names, thus when demangling a name
39 * it's possible the buffer won't be big enough (DEMANGLE_ESPACE) so here we
40 * try to allocate bigger buffers. However, we place a limit on this buffer
41 * size for fear of a C++ error sending us into an infinit loop.
42 *
43 * NOTE. we create and use a common buffer for use by cplus_demangle(), thus
44 * each call to this routine will override the contents of any existing call.
45 * Normally this is sufficient for typical error diagnostics referencing one
46 * symbol. For those diagnostics using more than one symbol name, all but the
47 * last name must be copied to a temporary buffer (regardless of whether
48 * demangling occurred, as the process of attempting to demangle may damage the
49 * buffer). One model is:
50 *
51 * if ((_name1 = demangle(name1)) != name1) {
52 * char * __name1 = strdupa(_name1);
53 * name1 = (const char *)__name1;
54 * }
55 * name2 = demangle(name2);
56 * eprintf(format, name1, name2);
57 */
58 #define SYM_MAX 1000
59
60 const char *
conv_demangle_name(const char * name)61 conv_demangle_name(const char *name)
62 {
63 static char *(*fptr)() = 0;
64 static volatile int loading = 0;
65 char *d;
66
67 if (loading)
68 return (name);
69
70 /*
71 * If we haven't located the demangler yet try now (we do this rather
72 * than maintain a static dependency on libdemangle as it's part of an
73 * optional package). Null the str element out to reject any other
74 * callers until this operation is complete - under ld.so.1 we can get
75 * into serious recursion without this.
76 */
77 if (fptr == 0) {
78 void *hdl;
79
80 loading = 1;
81 if (!(hdl = dlopen(MSG_ORIG(MSG_DEM_LIB), RTLD_LAZY)) ||
82 !(fptr = (char *(*)())dlsym(hdl, MSG_ORIG(MSG_DEM_SYM))))
83 return (name);
84 loading = 0;
85 }
86
87 if ((d = fptr(name, SYSDEM_LANG_AUTO, NULL)) == NULL)
88 return (name);
89
90 return (d);
91 }
92