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
|
// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/debug/stack_trace.h"
#include <android/log.h>
#include <stddef.h>
#include <unwind.h>
#include <algorithm>
#include <ostream>
#include "base/compiler_specific.h"
#include "base/debug/proc_maps_linux.h"
#include "base/memory/raw_ptr.h"
#include "base/strings/strcat.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_restrictions.h"
#ifdef __LP64__
#define FMT_ADDR "0x%016lx"
#else
#define FMT_ADDR "0x%08x"
#endif
namespace {
struct StackCrawlState {
StackCrawlState(uintptr_t* frames, size_t max_depth)
: frames(frames),
frame_count(0),
max_depth(max_depth),
have_skipped_self(false) {}
raw_ptr<uintptr_t, AllowPtrArithmetic> frames;
size_t frame_count;
size_t max_depth;
bool have_skipped_self;
};
_Unwind_Reason_Code TraceStackFrame(_Unwind_Context* context, void* arg) {
StackCrawlState* state = static_cast<StackCrawlState*>(arg);
uintptr_t ip = _Unwind_GetIP(context);
// The first stack frame is this function itself. Skip it.
if (ip != 0 && !state->have_skipped_self) {
state->have_skipped_self = true;
return _URC_NO_REASON;
}
state->frames[state->frame_count++] = ip;
if (state->frame_count >= state->max_depth) {
return _URC_END_OF_STACK;
}
return _URC_NO_REASON;
}
bool EndsWith(const std::string& s, const std::string& suffix) {
return s.size() >= suffix.size() &&
s.substr(s.size() - suffix.size(), suffix.size()) == suffix;
}
} // namespace
namespace base {
namespace debug {
bool EnableInProcessStackDumping() {
// When running in an application, our code typically expects SIGPIPE
// to be ignored. Therefore, when testing that same code, it should run
// with SIGPIPE ignored as well.
// TODO(phajdan.jr): De-duplicate this SIGPIPE code.
struct sigaction action;
UNSAFE_TODO(memset(&action, 0, sizeof(action)));
action.sa_handler = SIG_IGN;
sigemptyset(&action.sa_mask);
return (sigaction(SIGPIPE, &action, NULL) == 0);
}
size_t CollectStackTrace(span<const void*> trace) {
StackCrawlState state(reinterpret_cast<uintptr_t*>(trace.data()),
trace.size());
_Unwind_Backtrace(&TraceStackFrame, &state);
return state.frame_count;
}
// static
void StackTrace::PrintMessageWithPrefix(cstring_view prefix_string,
cstring_view message) {
if (!prefix_string.empty()) {
__android_log_write(ANDROID_LOG_ERROR, "chromium",
StrCat({prefix_string, message}).c_str());
} else {
__android_log_write(ANDROID_LOG_ERROR, "chromium", message.c_str());
}
}
void StackTrace::PrintWithPrefixImpl(cstring_view prefix_string) const {
std::string backtrace = ToStringWithPrefix(prefix_string);
__android_log_write(ANDROID_LOG_ERROR, "chromium", backtrace.c_str());
}
// NOTE: Native libraries in APKs are stripped before installing. Print out the
// relocatable address and library names so host computers can use tools to
// symbolize and demangle (e.g., addr2line, c++filt).
void StackTrace::OutputToStreamWithPrefixImpl(
std::ostream* os,
cstring_view prefix_string) const {
std::string proc_maps;
std::vector<MappedMemoryRegion> regions;
// Allow IO to read /proc/self/maps. Reading this file doesn't hit the disk
// since it lives in procfs, and this is currently used to print a stack trace
// on fatal log messages in debug builds only. If the restriction is enabled
// then it will recursively trigger fatal failures when this enters on the
// UI thread.
base::ScopedAllowBlocking scoped_allow_blocking;
if (!ReadProcMaps(&proc_maps)) {
__android_log_write(ANDROID_LOG_ERROR, "chromium",
"Failed to read /proc/self/maps");
} else if (!ParseProcMaps(proc_maps, ®ions)) {
__android_log_write(ANDROID_LOG_ERROR, "chromium",
"Failed to parse /proc/self/maps");
}
for (size_t i = 0; i < count_; ++i) {
// Subtract one as return address of function may be in the next
// function when a function is annotated as noreturn.
uintptr_t address = reinterpret_cast<uintptr_t>(trace_[i]) - 1;
std::vector<MappedMemoryRegion>::iterator iter = regions.begin();
while (iter != regions.end()) {
if (address >= iter->start && address < iter->end &&
!iter->path.empty()) {
break;
}
++iter;
}
*os << prefix_string;
// Adjust absolute address to be an offset within the mapped region, to
// match the format dumped by Android's crash output.
if (iter != regions.end()) {
address -= iter->start;
}
// The format below intentionally matches that of Android's debuggerd
// output. This simplifies decoding by scripts such as stack.py.
*os << base::StringPrintf("#%02zd pc " FMT_ADDR " ", i, address);
if (iter != regions.end()) {
*os << base::StringPrintf("%s", iter->path.c_str());
if (EndsWith(iter->path, ".apk")) {
*os << base::StringPrintf(" (offset 0x%llx)", iter->offset);
}
} else {
*os << "<unknown>";
}
*os << "\n";
}
}
} // namespace debug
} // namespace base
|
