140 lines
4.1 KiB
C++
140 lines
4.1 KiB
C++
/*
|
|
* Copyright (C) 2018 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "backtrace_helper.h"
|
|
|
|
#if defined(__linux__)
|
|
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "unwindstack/Regs.h"
|
|
#include "unwindstack/RegsGetLocal.h"
|
|
#include "unwindstack/Memory.h"
|
|
#include "unwindstack/Unwinder.h"
|
|
|
|
#include "base/bit_utils.h"
|
|
#include "entrypoints/runtime_asm_entrypoints.h"
|
|
#include "thread-inl.h"
|
|
|
|
#else
|
|
|
|
// For UNUSED
|
|
#include "base/macros.h"
|
|
|
|
#endif
|
|
|
|
namespace art {
|
|
|
|
// We only really support libunwindstack on linux which is unfortunate but since this is only for
|
|
// gcstress this isn't a huge deal.
|
|
#if defined(__linux__)
|
|
|
|
struct UnwindHelper : public TLSData {
|
|
static constexpr const char* kTlsKey = "UnwindHelper::kTlsKey";
|
|
|
|
explicit UnwindHelper(size_t max_depth)
|
|
: memory_(unwindstack::Memory::CreateProcessMemory(getpid())),
|
|
jit_(memory_),
|
|
dex_(memory_),
|
|
unwinder_(max_depth, &maps_, memory_) {
|
|
CHECK(maps_.Parse());
|
|
unwinder_.SetJitDebug(&jit_, unwindstack::Regs::CurrentArch());
|
|
unwinder_.SetDexFiles(&dex_, unwindstack::Regs::CurrentArch());
|
|
unwinder_.SetResolveNames(false);
|
|
unwindstack::Elf::SetCachingEnabled(true);
|
|
}
|
|
|
|
// Reparse process mmaps to detect newly loaded libraries.
|
|
bool Reparse() { return maps_.Reparse(); }
|
|
|
|
static UnwindHelper* Get(Thread* self, size_t max_depth) {
|
|
UnwindHelper* tls = reinterpret_cast<UnwindHelper*>(self->GetCustomTLS(kTlsKey));
|
|
if (tls == nullptr) {
|
|
tls = new UnwindHelper(max_depth);
|
|
self->SetCustomTLS(kTlsKey, tls);
|
|
}
|
|
return tls;
|
|
}
|
|
|
|
unwindstack::Unwinder* Unwinder() { return &unwinder_; }
|
|
|
|
private:
|
|
unwindstack::LocalUpdatableMaps maps_;
|
|
std::shared_ptr<unwindstack::Memory> memory_;
|
|
unwindstack::JitDebug jit_;
|
|
unwindstack::DexFiles dex_;
|
|
unwindstack::Unwinder unwinder_;
|
|
};
|
|
|
|
void BacktraceCollector::Collect() {
|
|
if (!CollectImpl()) {
|
|
// Reparse process mmaps to detect newly loaded libraries and retry.
|
|
UnwindHelper::Get(Thread::Current(), max_depth_)->Reparse();
|
|
if (!CollectImpl()) {
|
|
// Failed to unwind stack. Ignore for now.
|
|
}
|
|
}
|
|
}
|
|
|
|
bool BacktraceCollector::CollectImpl() {
|
|
unwindstack::Unwinder* unwinder = UnwindHelper::Get(Thread::Current(), max_depth_)->Unwinder();
|
|
std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::CreateFromLocal());
|
|
RegsGetLocal(regs.get());
|
|
unwinder->SetRegs(regs.get());
|
|
unwinder->Unwind();
|
|
|
|
num_frames_ = 0;
|
|
if (unwinder->NumFrames() > skip_count_) {
|
|
for (auto it = unwinder->frames().begin() + skip_count_; it != unwinder->frames().end(); ++it) {
|
|
CHECK_LT(num_frames_, max_depth_);
|
|
out_frames_[num_frames_++] = static_cast<uintptr_t>(it->pc);
|
|
|
|
// Expected early end: Instrumentation breaks unwinding (b/138296821).
|
|
size_t align = GetInstructionSetAlignment(kRuntimeISA);
|
|
if (RoundUp(it->pc, align) == reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc())) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (unwinder->LastErrorCode() == unwindstack::ERROR_INVALID_MAP) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#else
|
|
|
|
#pragma clang diagnostic push
|
|
#pragma clang diagnostic warning "-W#warnings"
|
|
#warning "Backtrace collector is not implemented. GCStress cannot be used."
|
|
#pragma clang diagnostic pop
|
|
|
|
// We only have an implementation for linux. On other plaforms just return nothing. This is not
|
|
// really correct but we only use this for hashing and gcstress so it's not too big a deal.
|
|
void BacktraceCollector::Collect() {
|
|
UNUSED(skip_count_);
|
|
UNUSED(out_frames_);
|
|
UNUSED(max_depth_);
|
|
num_frames_ = 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
} // namespace art
|