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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 <unwind.h>
#include "base/debug/proc_maps_linux.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;
}
} // 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);
}
StackTrace::StackTrace() {
StackCrawlState state(reinterpret_cast<uintptr_t*>(trace_), kMaxTraces);
_Unwind_Backtrace(&TraceStackFrame, &state);
count_ = state.frame_count;
}
void StackTrace::Print() const {
std::string backtrace = ToString();
__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::OutputToStream(std::ostream* os) 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;
}
*os << base::StringPrintf("#%02zd " FMT_ADDR " ", i, address);
if (iter != regions.end()) {
uintptr_t rel_pc = address - iter->start + iter->offset;
const char* path = iter->path.c_str();
*os << base::StringPrintf("%s+" FMT_ADDR, path, rel_pc);
} else {
*os << "<unknown>";
}
*os << "\n";
}
}
} // namespace debug
} // namespace base
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