101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <atomic>
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#include <string_view>
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#include "arch/context.h"
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#include "art_method-inl.h"
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#include "jni.h"
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#include "scoped_thread_state_change.h"
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#include "stack.h"
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#include "thread.h"
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namespace art {
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namespace StackWalkConcurrentInstrument {
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std::atomic<bool> instrument_waiting = false;
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std::atomic<bool> instrumented = false;
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// Spin lock.
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static void WaitForInstrument() REQUIRES_SHARED(Locks::mutator_lock_) {
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ScopedThreadSuspension sts(Thread::Current(), ThreadState::kWaitingForDeoptimization);
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instrument_waiting = true;
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while (!instrumented) {
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}
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}
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class SelfStackWalkVisitor : public StackVisitor {
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public:
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explicit SelfStackWalkVisitor(Thread* thread) REQUIRES_SHARED(Locks::mutator_lock_)
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: StackVisitor(thread, Context::Create(), StackWalkKind::kIncludeInlinedFrames) {}
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bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) {
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if (GetMethod()->GetNameView() == "$noinline$f") {
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CHECK(!found_f_);
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found_f_ = true;
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} else if (GetMethod()->GetNameView() == "$noinline$g") {
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CHECK(!found_g_);
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found_g_ = true;
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WaitForInstrument();
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} else if (GetMethod()->GetNameView() == "$noinline$h") {
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CHECK(!found_h_);
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found_h_ = true;
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}
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return true;
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}
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bool found_f_ = false;
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bool found_g_ = false;
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bool found_h_ = false;
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};
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extern "C" JNIEXPORT void JNICALL Java_Main_resetTest(JNIEnv*, jobject) {
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instrument_waiting = false;
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instrumented = false;
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}
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extern "C" JNIEXPORT void JNICALL Java_Main_doSelfStackWalk(JNIEnv*, jobject) {
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ScopedObjectAccess soa(Thread::Current());
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SelfStackWalkVisitor sswv(Thread::Current());
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sswv.WalkStack();
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CHECK(sswv.found_f_);
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CHECK(sswv.found_g_);
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CHECK(sswv.found_h_);
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}
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extern "C" JNIEXPORT void JNICALL Java_Main_waitAndInstrumentStack(JNIEnv*,
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jobject,
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jobject target) {
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while (!instrument_waiting) {
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}
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bool timed_out = false;
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Thread* other = Runtime::Current()->GetThreadList()->SuspendThreadByPeer(
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target, SuspendReason::kInternal, &timed_out);
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CHECK(!timed_out);
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CHECK(other != nullptr);
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ScopedSuspendAll ssa(__FUNCTION__);
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Runtime::Current()->GetInstrumentation()->InstrumentThreadStack(other,
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/* deopt_all_frames= */ false);
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MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_);
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bool updated = other->ModifySuspendCount(Thread::Current(), -1, nullptr, SuspendReason::kInternal);
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CHECK(updated);
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instrumented = true;
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return;
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}
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} // namespace StackWalkConcurrentInstrument
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} // namespace art
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