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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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/debug/proc_maps_linux.h"
#include "base/stl_util.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) {}
uintptr_t* 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;
memset(&action, 0, sizeof(action));
action.sa_handler = SIG_IGN;
sigemptyset(&action.sa_mask);
return (sigaction(SIGPIPE, &action, NULL) == 0);
}
size_t CollectStackTrace(void** trace, size_t count) {
StackCrawlState state(reinterpret_cast<uintptr_t*>(trace), count);
_Unwind_Backtrace(&TraceStackFrame, &state);
return state.frame_count;
}
void StackTrace::PrintWithPrefix(const char* 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::OutputToStreamWithPrefix(std::ostream* os,
const char* 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::ThreadRestrictions::ScopedAllowIO allow_io;
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;
}
if (prefix_string)
*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
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