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/*
* Copyright 2020 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 <atomic>
#include <string_view>
#include "arch/context.h"
#include "art_method-inl.h"
#include "jni.h"
#include "scoped_thread_state_change.h"
#include "stack.h"
#include "thread.h"
namespace art {
namespace StackWalkConcurrentInstrument {
std::atomic<bool> instrument_waiting = false;
std::atomic<bool> instrumented = false;
// Spin lock.
static void WaitForInstrument() REQUIRES_SHARED(Locks::mutator_lock_) {
ScopedThreadSuspension sts(Thread::Current(), ThreadState::kWaitingForDeoptimization);
instrument_waiting = true;
while (!instrumented) {
}
}
class SelfStackWalkVisitor : public StackVisitor {
public:
explicit SelfStackWalkVisitor(Thread* thread) REQUIRES_SHARED(Locks::mutator_lock_)
: StackVisitor(thread, Context::Create(), StackWalkKind::kIncludeInlinedFrames) {}
bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) {
if (GetMethod()->GetNameView() == "$noinline$f") {
CHECK(!found_f_);
found_f_ = true;
} else if (GetMethod()->GetNameView() == "$noinline$g") {
CHECK(!found_g_);
found_g_ = true;
WaitForInstrument();
} else if (GetMethod()->GetNameView() == "$noinline$h") {
CHECK(!found_h_);
found_h_ = true;
}
return true;
}
bool found_f_ = false;
bool found_g_ = false;
bool found_h_ = false;
};
extern "C" JNIEXPORT void JNICALL Java_Main_resetTest(JNIEnv*, jobject) {
instrument_waiting = false;
instrumented = false;
}
extern "C" JNIEXPORT void JNICALL Java_Main_doSelfStackWalk(JNIEnv*, jobject) {
ScopedObjectAccess soa(Thread::Current());
SelfStackWalkVisitor sswv(Thread::Current());
sswv.WalkStack();
CHECK(sswv.found_f_);
CHECK(sswv.found_g_);
CHECK(sswv.found_h_);
}
extern "C" JNIEXPORT void JNICALL Java_Main_waitAndDeopt(JNIEnv*, jobject, jobject target) {
while (!instrument_waiting) {
}
bool timed_out = false;
Thread* other = Runtime::Current()->GetThreadList()->SuspendThreadByPeer(
target, SuspendReason::kInternal, &timed_out);
CHECK(!timed_out);
CHECK(other != nullptr);
ScopedSuspendAll ssa(__FUNCTION__);
Runtime::Current()->GetInstrumentation()->InstrumentThreadStack(other);
MutexLock mu(Thread::Current(), *Locks::thread_suspend_count_lock_);
bool updated = other->ModifySuspendCount(Thread::Current(), -1, nullptr, SuspendReason::kInternal);
CHECK(updated);
instrumented = true;
return;
}
} // namespace StackWalkConcurrentInstrument
} // namespace art
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