/*
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* Copyright (C) 2015 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 "jni.h"
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#include <android-base/logging.h>
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#include "arch/context.h"
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#include "base/mutex.h"
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#include "dex/dex_file-inl.h"
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#include "jni/jni_internal.h"
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#include "mirror/class-inl.h"
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#include "nth_caller_visitor.h"
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#include "oat_file.h"
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#include "runtime.h"
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#include "scoped_thread_state_change-inl.h"
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#include "stack.h"
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#include "thread-current-inl.h"
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namespace art {
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static bool asserts_enabled = true;
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// public static native void disableStackFrameAsserts();
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// Note: to globally disable asserts in unsupported configurations.
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extern "C" JNIEXPORT void JNICALL Java_Main_disableStackFrameAsserts(JNIEnv* env ATTRIBUTE_UNUSED,
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jclass cls ATTRIBUTE_UNUSED) {
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asserts_enabled = false;
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}
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static jboolean IsInterpreted(JNIEnv* env, jclass, size_t level) {
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ScopedObjectAccess soa(env);
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NthCallerVisitor caller(soa.Self(), level, false);
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caller.WalkStack();
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CHECK(caller.caller != nullptr);
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return caller.GetCurrentShadowFrame() != nullptr ? JNI_TRUE : JNI_FALSE;
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}
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// public static native boolean isInterpreted();
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extern "C" JNIEXPORT jboolean JNICALL Java_Main_isInterpreted(JNIEnv* env, jclass klass) {
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return IsInterpreted(env, klass, 1);
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}
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// public static native boolean isInterpreted(int depth);
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extern "C" JNIEXPORT jboolean JNICALL Java_Main_isInterpretedAt(JNIEnv* env,
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jclass klass,
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jint depth) {
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return IsInterpreted(env, klass, depth);
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}
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// public static native boolean isInterpretedFunction(String smali);
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static bool IsMethodInterpreted(Thread* self,
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const ArtMethod* goal,
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const bool require_deoptable,
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/* out */ bool* method_is_interpreted)
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REQUIRES_SHARED(Locks::mutator_lock_) {
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*method_is_interpreted = true;
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bool method_found = false;
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bool prev_was_runtime = true;
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StackVisitor::WalkStack(
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[&](const art::StackVisitor* stack_visitor) REQUIRES_SHARED(Locks::mutator_lock_) {
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if (goal == stack_visitor->GetMethod()) {
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*method_is_interpreted =
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(require_deoptable && prev_was_runtime) || stack_visitor->IsShadowFrame();
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method_found = true;
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return false;
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}
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prev_was_runtime = stack_visitor->GetMethod()->IsRuntimeMethod();
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return true;
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},
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self,
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/* context= */ nullptr,
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art::StackVisitor::StackWalkKind::kIncludeInlinedFrames);
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return method_found;
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}
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// TODO Remove 'require_deoptimizable' option once we have deoptimization through runtime frames.
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extern "C" JNIEXPORT jboolean JNICALL Java_Main_isInterpretedFunction(
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JNIEnv* env, jclass klass ATTRIBUTE_UNUSED, jobject method, jboolean require_deoptimizable) {
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// Return false if this seems to not be an ART runtime.
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if (Runtime::Current() == nullptr) {
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return JNI_FALSE;
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}
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if (method == nullptr) {
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env->ThrowNew(env->FindClass("java/lang/NullPointerException"), "method is null!");
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return JNI_FALSE;
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}
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jmethodID id = env->FromReflectedMethod(method);
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if (id == nullptr) {
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env->ThrowNew(env->FindClass("java/lang/Error"), "Unable to interpret method argument!");
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return JNI_FALSE;
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}
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{
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ScopedObjectAccess soa(env);
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ArtMethod* goal = jni::DecodeArtMethod(id);
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bool is_interpreted;
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if (!IsMethodInterpreted(soa.Self(), goal, require_deoptimizable, &is_interpreted)) {
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env->ThrowNew(env->FindClass("java/lang/Error"), "Unable to find given method in stack!");
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return JNI_FALSE;
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}
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bool enters_interpreter = Runtime::Current()->GetClassLinker()->IsQuickToInterpreterBridge(
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goal->GetEntryPointFromQuickCompiledCode());
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return (is_interpreted || enters_interpreter);
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}
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}
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// public static native void assertIsInterpreted();
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extern "C" JNIEXPORT void JNICALL Java_Main_assertIsInterpreted(JNIEnv* env, jclass klass) {
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if (asserts_enabled) {
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CHECK(Java_Main_isInterpreted(env, klass));
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}
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}
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static jboolean IsManaged(JNIEnv* env, jclass, size_t level) {
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ScopedObjectAccess soa(env);
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NthCallerVisitor caller(soa.Self(), level, false);
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caller.WalkStack();
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CHECK(caller.caller != nullptr);
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return caller.GetCurrentShadowFrame() != nullptr ? JNI_FALSE : JNI_TRUE;
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}
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// public static native boolean isManaged();
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extern "C" JNIEXPORT jboolean JNICALL Java_Main_isManaged(JNIEnv* env, jclass cls) {
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return IsManaged(env, cls, 1);
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}
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// public static native void assertIsManaged();
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extern "C" JNIEXPORT void JNICALL Java_Main_assertIsManaged(JNIEnv* env, jclass cls) {
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if (asserts_enabled) {
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CHECK(Java_Main_isManaged(env, cls));
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}
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}
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// public static native boolean isCallerInterpreted();
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extern "C" JNIEXPORT jboolean JNICALL Java_Main_isCallerInterpreted(JNIEnv* env, jclass klass) {
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return IsInterpreted(env, klass, 2);
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}
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// public static native void assertCallerIsInterpreted();
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extern "C" JNIEXPORT void JNICALL Java_Main_assertCallerIsInterpreted(JNIEnv* env, jclass klass) {
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if (asserts_enabled) {
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CHECK(Java_Main_isCallerInterpreted(env, klass));
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}
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}
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// public static native boolean isCallerManaged();
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extern "C" JNIEXPORT jboolean JNICALL Java_Main_isCallerManaged(JNIEnv* env, jclass cls) {
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return IsManaged(env, cls, 2);
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}
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// public static native void assertCallerIsManaged();
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extern "C" JNIEXPORT void JNICALL Java_Main_assertCallerIsManaged(JNIEnv* env, jclass cls) {
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if (asserts_enabled) {
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CHECK(Java_Main_isCallerManaged(env, cls));
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}
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}
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extern "C" JNIEXPORT jobject JNICALL Java_Main_getThisOfCaller(
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JNIEnv* env, jclass cls ATTRIBUTE_UNUSED) {
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ScopedObjectAccess soa(env);
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std::unique_ptr<art::Context> context(art::Context::Create());
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jobject result = nullptr;
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StackVisitor::WalkStack(
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[&](const art::StackVisitor* stack_visitor) REQUIRES_SHARED(Locks::mutator_lock_) {
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// Discard stubs and Main.getThisOfCaller.
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if (stack_visitor->GetMethod() == nullptr || stack_visitor->GetMethod()->IsNative()) {
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return true;
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}
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result = soa.AddLocalReference<jobject>(stack_visitor->GetThisObject());
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return false;
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},
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soa.Self(),
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context.get(),
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art::StackVisitor::StackWalkKind::kIncludeInlinedFrames);
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return result;
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}
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} // namespace art
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