1 files changed, 97 insertions, 0 deletions
diff --git a/test/2011-stack-walk-concurrent-instrument/stack_walk_concurrent.cc b/test/2011-stack-walk-concurrent-instrument/stack_walk_concurrent.cc
new file mode 100644
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+++ b/test/2011-stack-walk-concurrent-instrument/stack_walk_concurrent.cc
@@ -0,0 +1,97 @@
+/*
+ * 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, true, 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