Daily bump.
[official-gcc.git] / libbacktrace / fileline.c
blob0acad0603eeb071a4b114cf3a7f544536a1be405
1 /* fileline.c -- Get file and line number information in a backtrace.
2 Copyright (C) 2012-2015 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Google.
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are
7 met:
9 (1) Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
12 (2) Redistributions in binary form must reproduce the above copyright
13 notice, this list of conditions and the following disclaimer in
14 the documentation and/or other materials provided with the
15 distribution.
17 (3) The name of the author may not be used to
18 endorse or promote products derived from this software without
19 specific prior written permission.
21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
25 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
29 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 POSSIBILITY OF SUCH DAMAGE. */
33 #include "config.h"
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <stdlib.h>
41 #include "backtrace.h"
42 #include "internal.h"
44 #ifndef HAVE_GETEXECNAME
45 #define getexecname() NULL
46 #endif
48 /* Initialize the fileline information from the executable. Returns 1
49 on success, 0 on failure. */
51 static int
52 fileline_initialize (struct backtrace_state *state,
53 backtrace_error_callback error_callback, void *data)
55 int failed;
56 fileline fileline_fn;
57 int pass;
58 int called_error_callback;
59 int descriptor;
61 if (!state->threaded)
62 failed = state->fileline_initialization_failed;
63 else
64 failed = backtrace_atomic_load_int (&state->fileline_initialization_failed);
66 if (failed)
68 error_callback (data, "failed to read executable information", -1);
69 return 0;
72 if (!state->threaded)
73 fileline_fn = state->fileline_fn;
74 else
75 fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn);
76 if (fileline_fn != NULL)
77 return 1;
79 /* We have not initialized the information. Do it now. */
81 descriptor = -1;
82 called_error_callback = 0;
83 for (pass = 0; pass < 4; ++pass)
85 const char *filename;
86 int does_not_exist;
88 switch (pass)
90 case 0:
91 filename = state->filename;
92 break;
93 case 1:
94 filename = getexecname ();
95 break;
96 case 2:
97 filename = "/proc/self/exe";
98 break;
99 case 3:
100 filename = "/proc/curproc/file";
101 break;
102 default:
103 abort ();
106 if (filename == NULL)
107 continue;
109 descriptor = backtrace_open (filename, error_callback, data,
110 &does_not_exist);
111 if (descriptor < 0 && !does_not_exist)
113 called_error_callback = 1;
114 break;
116 if (descriptor >= 0)
117 break;
120 if (descriptor < 0)
122 if (!called_error_callback)
124 if (state->filename != NULL)
125 error_callback (data, state->filename, ENOENT);
126 else
127 error_callback (data,
128 "libbacktrace could not find executable to open",
131 failed = 1;
134 if (!failed)
136 if (!backtrace_initialize (state, descriptor, error_callback, data,
137 &fileline_fn))
138 failed = 1;
141 if (failed)
143 if (!state->threaded)
144 state->fileline_initialization_failed = 1;
145 else
146 backtrace_atomic_store_int (&state->fileline_initialization_failed, 1);
147 return 0;
150 if (!state->threaded)
151 state->fileline_fn = fileline_fn;
152 else
154 backtrace_atomic_store_pointer (&state->fileline_fn, fileline_fn);
156 /* Note that if two threads initialize at once, one of the data
157 sets may be leaked. */
160 return 1;
163 /* Given a PC, find the file name, line number, and function name. */
166 backtrace_pcinfo (struct backtrace_state *state, uintptr_t pc,
167 backtrace_full_callback callback,
168 backtrace_error_callback error_callback, void *data)
170 if (!fileline_initialize (state, error_callback, data))
171 return 0;
173 if (state->fileline_initialization_failed)
174 return 0;
176 return state->fileline_fn (state, pc, callback, error_callback, data);
179 /* Given a PC, find the symbol for it, and its value. */
182 backtrace_syminfo (struct backtrace_state *state, uintptr_t pc,
183 backtrace_syminfo_callback callback,
184 backtrace_error_callback error_callback, void *data)
186 if (!fileline_initialize (state, error_callback, data))
187 return 0;
189 if (state->fileline_initialization_failed)
190 return 0;
192 state->syminfo_fn (state, pc, callback, error_callback, data);
193 return 1;