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92f5a8d4 | 1 | // Copyright Antony Polukhin, 2016-2019. |
b32b8144 FG |
2 | // |
3 | // Distributed under the Boost Software License, Version 1.0. (See | |
4 | // accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | #ifndef BOOST_STACKTRACE_DETAIL_ADDR2LINE_IMPLS_HPP | |
8 | #define BOOST_STACKTRACE_DETAIL_ADDR2LINE_IMPLS_HPP | |
9 | ||
10 | #include <boost/config.hpp> | |
11 | #ifdef BOOST_HAS_PRAGMA_ONCE | |
12 | # pragma once | |
13 | #endif | |
14 | ||
15 | #include <boost/stacktrace/detail/to_hex_array.hpp> | |
92f5a8d4 TL |
16 | #include <boost/stacktrace/detail/to_dec_array.hpp> |
17 | #include <boost/stacktrace/detail/try_dec_convert.hpp> | |
b32b8144 | 18 | #include <boost/core/demangle.hpp> |
b32b8144 FG |
19 | #include <cstdio> |
20 | ||
21 | #include <sys/types.h> | |
22 | #include <sys/wait.h> | |
23 | #include <signal.h> | |
24 | ||
25 | ||
26 | namespace boost { namespace stacktrace { namespace detail { | |
27 | ||
28 | ||
29 | #if defined(BOOST_STACKTRACE_ADDR2LINE_LOCATION) && !defined(BOOST_NO_CXX11_CONSTEXPR) | |
30 | ||
31 | constexpr bool is_abs_path(const char* path) BOOST_NOEXCEPT { | |
32 | return *path != '\0' && ( | |
33 | *path == ':' || *path == '/' || is_abs_path(path + 1) | |
34 | ); | |
35 | } | |
36 | ||
37 | #endif | |
38 | ||
39 | class addr2line_pipe { | |
40 | ::FILE* p; | |
41 | ::pid_t pid; | |
42 | ||
43 | public: | |
44 | explicit addr2line_pipe(const char *flag, const char* exec_path, const char* addr) BOOST_NOEXCEPT | |
45 | : p(0) | |
46 | , pid(0) | |
47 | { | |
48 | int pdes[2]; | |
49 | #ifdef BOOST_STACKTRACE_ADDR2LINE_LOCATION | |
50 | char prog_name[] = BOOST_STRINGIZE( BOOST_STACKTRACE_ADDR2LINE_LOCATION ); | |
51 | #if !defined(BOOST_NO_CXX11_CONSTEXPR) && !defined(BOOST_NO_CXX11_STATIC_ASSERT) | |
52 | static_assert( | |
53 | boost::stacktrace::detail::is_abs_path( BOOST_STRINGIZE( BOOST_STACKTRACE_ADDR2LINE_LOCATION ) ), | |
54 | "BOOST_STACKTRACE_ADDR2LINE_LOCATION must be an absolute path" | |
55 | ); | |
56 | #endif | |
57 | ||
58 | #else | |
59 | char prog_name[] = "/usr/bin/addr2line"; | |
60 | #endif | |
61 | ||
62 | char* argp[] = { | |
63 | prog_name, | |
64 | const_cast<char*>(flag), | |
65 | const_cast<char*>(exec_path), | |
66 | const_cast<char*>(addr), | |
67 | 0 | |
68 | }; | |
69 | ||
70 | if (::pipe(pdes) < 0) { | |
71 | return; | |
72 | } | |
73 | ||
74 | pid = ::fork(); | |
75 | switch (pid) { | |
76 | case -1: | |
77 | // Failed... | |
78 | ::close(pdes[0]); | |
79 | ::close(pdes[1]); | |
80 | return; | |
81 | ||
82 | case 0: | |
83 | // We are the child. | |
84 | ::close(STDERR_FILENO); | |
85 | ::close(pdes[0]); | |
86 | if (pdes[1] != STDOUT_FILENO) { | |
87 | ::dup2(pdes[1], STDOUT_FILENO); | |
88 | } | |
89 | ||
90 | // Do not use `execlp()`, `execvp()`, and `execvpe()` here! | |
91 | // `exec*p*` functions are vulnerable to PATH variable evaluation attacks. | |
92 | ::execv(prog_name, argp); | |
93 | ::_exit(127); | |
94 | } | |
95 | ||
96 | p = ::fdopen(pdes[0], "r"); | |
97 | ::close(pdes[1]); | |
98 | } | |
99 | ||
100 | operator ::FILE*() const BOOST_NOEXCEPT { | |
101 | return p; | |
102 | } | |
103 | ||
104 | ~addr2line_pipe() BOOST_NOEXCEPT { | |
105 | if (p) { | |
106 | ::fclose(p); | |
107 | int pstat = 0; | |
108 | ::kill(pid, SIGKILL); | |
109 | ::waitpid(pid, &pstat, 0); | |
110 | } | |
111 | } | |
112 | }; | |
113 | ||
114 | inline std::string addr2line(const char* flag, const void* addr) { | |
115 | std::string res; | |
116 | ||
117 | boost::stacktrace::detail::location_from_symbol loc(addr); | |
118 | if (!loc.empty()) { | |
119 | res = loc.name(); | |
120 | } else { | |
121 | res.resize(16); | |
122 | int rlin_size = ::readlink("/proc/self/exe", &res[0], res.size() - 1); | |
123 | while (rlin_size == static_cast<int>(res.size() - 1)) { | |
124 | res.resize(res.size() * 4); | |
125 | rlin_size = ::readlink("/proc/self/exe", &res[0], res.size() - 1); | |
126 | } | |
127 | if (rlin_size == -1) { | |
128 | res.clear(); | |
129 | return res; | |
130 | } | |
131 | res.resize(rlin_size); | |
132 | } | |
133 | ||
134 | addr2line_pipe p(flag, res.c_str(), to_hex_array(addr).data()); | |
135 | res.clear(); | |
136 | ||
137 | if (!p) { | |
138 | return res; | |
139 | } | |
140 | ||
141 | char data[32]; | |
142 | while (!::feof(p)) { | |
143 | if (::fgets(data, sizeof(data), p)) { | |
144 | res += data; | |
145 | } else { | |
146 | break; | |
147 | } | |
148 | } | |
149 | ||
150 | // Trimming | |
151 | while (!res.empty() && (res[res.size() - 1] == '\n' || res[res.size() - 1] == '\r')) { | |
152 | res.erase(res.size() - 1); | |
153 | } | |
154 | ||
155 | return res; | |
156 | } | |
157 | ||
158 | ||
159 | struct to_string_using_addr2line { | |
160 | std::string res; | |
161 | void prepare_function_name(const void* addr) { | |
162 | res = boost::stacktrace::frame(addr).name(); | |
163 | } | |
164 | ||
165 | bool prepare_source_location(const void* addr) { | |
166 | //return addr2line("-Cfipe", addr); // Does not seem to work in all cases | |
167 | std::string source_line = boost::stacktrace::detail::addr2line("-Cpe", addr); | |
168 | if (!source_line.empty() && source_line[0] != '?') { | |
169 | res += " at "; | |
170 | res += source_line; | |
171 | return true; | |
172 | } | |
173 | ||
174 | return false; | |
175 | } | |
176 | }; | |
177 | ||
178 | template <class Base> class to_string_impl_base; | |
179 | typedef to_string_impl_base<to_string_using_addr2line> to_string_impl; | |
180 | ||
181 | inline std::string name_impl(const void* addr) { | |
182 | std::string res = boost::stacktrace::detail::addr2line("-fe", addr); | |
183 | res = res.substr(0, res.find_last_of('\n')); | |
184 | res = boost::core::demangle(res.c_str()); | |
185 | ||
186 | if (res == "??") { | |
187 | res.clear(); | |
188 | } | |
189 | ||
190 | return res; | |
191 | } | |
192 | ||
193 | } // namespace detail | |
194 | ||
195 | std::string frame::source_file() const { | |
196 | std::string res; | |
197 | res = boost::stacktrace::detail::addr2line("-e", addr_); | |
198 | res = res.substr(0, res.find_last_of(':')); | |
199 | if (res == "??") { | |
200 | res.clear(); | |
201 | } | |
202 | ||
203 | return res; | |
204 | } | |
205 | ||
206 | ||
207 | std::size_t frame::source_line() const { | |
208 | std::size_t line_num = 0; | |
209 | std::string res = boost::stacktrace::detail::addr2line("-e", addr_); | |
210 | const std::size_t last = res.find_last_of(':'); | |
211 | if (last == std::string::npos) { | |
212 | return 0; | |
213 | } | |
214 | res = res.substr(last + 1); | |
215 | ||
92f5a8d4 | 216 | if (!boost::stacktrace::detail::try_dec_convert(res.c_str(), line_num)) { |
b32b8144 FG |
217 | return 0; |
218 | } | |
219 | ||
220 | return line_num; | |
221 | } | |
222 | ||
223 | ||
224 | }} // namespace boost::stacktrace | |
225 | ||
226 | #endif // BOOST_STACKTRACE_DETAIL_ADDR2LINE_IMPLS_HPP |