Merge "Rename jniGetReferent to GetReferent and cache the method id it uses." am: fe892a0f52

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2152646

Change-Id: I2dfdec571499cb10db92afe52b23ef0f585a5b51
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

core/jni/Android.bp

@@ -50,6 +50,7 @@ cc_library_shared {
         "android_util_XmlBlock.cpp",
         "android_util_jar_StrictJarFile.cpp",
         "com_android_internal_util_VirtualRefBasePtr.cpp",
+        "core_jni_helpers.cpp",
         ":deviceproductinfoconstants_aidl",
     ],
 

core/jni/android_hardware_SensorManager.cpp

@@ -348,7 +348,7 @@ private:
     virtual int handleEvent(int fd, int events, void* data) {
         JNIEnv* env = AndroidRuntime::getJNIEnv();
         sp<SensorEventQueue> q = reinterpret_cast<SensorEventQueue *>(data);
-        ScopedLocalRef<jobject> receiverObj(env, jniGetReferent(env, mReceiverWeakGlobal));
+        ScopedLocalRef<jobject> receiverObj(env, GetReferent(env, mReceiverWeakGlobal));
 
         ssize_t n;
         ASensorEvent buffer[16];

core/jni/android_view_DisplayEventReceiver.cpp

@@ -138,7 +138,7 @@ void NativeDisplayEventReceiver::dispatchVsync(nsecs_t timestamp, PhysicalDispla
                                                uint32_t count, VsyncEventData vsyncEventData) {
     JNIEnv* env = AndroidRuntime::getJNIEnv();
 
-    ScopedLocalRef<jobject> receiverObj(env, jniGetReferent(env, mReceiverWeakGlobal));
+    ScopedLocalRef<jobject> receiverObj(env, GetReferent(env, mReceiverWeakGlobal));
     if (receiverObj.get()) {
         ALOGV("receiver %p ~ Invoking vsync handler.", this);
 
@@ -155,7 +155,7 @@ void NativeDisplayEventReceiver::dispatchHotplug(nsecs_t timestamp, PhysicalDisp
                                                  bool connected) {
     JNIEnv* env = AndroidRuntime::getJNIEnv();
 
-    ScopedLocalRef<jobject> receiverObj(env, jniGetReferent(env, mReceiverWeakGlobal));
+    ScopedLocalRef<jobject> receiverObj(env, GetReferent(env, mReceiverWeakGlobal));
     if (receiverObj.get()) {
         ALOGV("receiver %p ~ Invoking hotplug handler.", this);
         env->CallVoidMethod(receiverObj.get(), gDisplayEventReceiverClassInfo.dispatchHotplug,
@@ -170,7 +170,7 @@ void NativeDisplayEventReceiver::dispatchModeChanged(nsecs_t timestamp, Physical
                                                      int32_t modeId, nsecs_t) {
     JNIEnv* env = AndroidRuntime::getJNIEnv();
 
-    ScopedLocalRef<jobject> receiverObj(env, jniGetReferent(env, mReceiverWeakGlobal));
+    ScopedLocalRef<jobject> receiverObj(env, GetReferent(env, mReceiverWeakGlobal));
     if (receiverObj.get()) {
         ALOGV("receiver %p ~ Invoking mode changed handler.", this);
         env->CallVoidMethod(receiverObj.get(), gDisplayEventReceiverClassInfo.dispatchModeChanged,
@@ -185,7 +185,7 @@ void NativeDisplayEventReceiver::dispatchFrameRateOverrides(
         nsecs_t timestamp, PhysicalDisplayId displayId, std::vector<FrameRateOverride> overrides) {
     JNIEnv* env = AndroidRuntime::getJNIEnv();
 
-    ScopedLocalRef<jobject> receiverObj(env, jniGetReferent(env, mReceiverWeakGlobal));
+    ScopedLocalRef<jobject> receiverObj(env, GetReferent(env, mReceiverWeakGlobal));
     if (receiverObj.get()) {
         ALOGV("receiver %p ~ Invoking FrameRateOverride handler.", this);
         const auto frameRateOverrideClass =

core/jni/android_view_InputEventReceiver.cpp

@@ -329,7 +329,7 @@ status_t NativeInputEventReceiver::consumeEvents(JNIEnv* env,
             if (!skipCallbacks && !mBatchedInputEventPending && mInputConsumer.hasPendingBatch()) {
                 // There is a pending batch.  Come back later.
                 if (!receiverObj.get()) {
-                    receiverObj.reset(jniGetReferent(env, mReceiverWeakGlobal));
+                    receiverObj.reset(GetReferent(env, mReceiverWeakGlobal));
                     if (!receiverObj.get()) {
                         ALOGW("channel '%s' ~ Receiver object was finalized "
                               "without being disposed.",
@@ -358,7 +358,7 @@ status_t NativeInputEventReceiver::consumeEvents(JNIEnv* env,
 
         if (!skipCallbacks) {
             if (!receiverObj.get()) {
-                receiverObj.reset(jniGetReferent(env, mReceiverWeakGlobal));
+                receiverObj.reset(GetReferent(env, mReceiverWeakGlobal));
                 if (!receiverObj.get()) {
                     ALOGW("channel '%s' ~ Receiver object was finalized "
                             "without being disposed.", getInputChannelName().c_str());

core/jni/android_view_InputEventSender.cpp

@@ -200,7 +200,7 @@ status_t NativeInputEventSender::processConsumerResponse(JNIEnv* env) {
         ALOGD("channel '%s' ~ Receiving finished signals.", getInputChannelName().c_str());
     }
 
-    ScopedLocalRef<jobject> senderObj(env, jniGetReferent(env, mSenderWeakGlobal));
+    ScopedLocalRef<jobject> senderObj(env, GetReferent(env, mSenderWeakGlobal));
     if (!senderObj.get()) {
         ALOGW("channel '%s' ~ Sender object was finalized without being disposed.",
               getInputChannelName().c_str());

core/jni/android_view_InputQueue.cpp

@@ -136,7 +136,7 @@ void InputQueue::handleMessage(const Message& message) {
     switch(message.what) {
     case MSG_FINISH_INPUT:
         JNIEnv* env = AndroidRuntime::getJNIEnv();
-        ScopedLocalRef<jobject> inputQueueObj(env, jniGetReferent(env, mInputQueueWeakGlobal));
+        ScopedLocalRef<jobject> inputQueueObj(env, GetReferent(env, mInputQueueWeakGlobal));
         if (!inputQueueObj.get()) {
             ALOGW("InputQueue was finalized without being disposed");
             return;

core/jni/core_jni_helpers.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2022 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 "core_jni_helpers.h"
+
+namespace android {
+
+namespace {
+
+jmethodID gGetReferent = nullptr;
+
+} // namespace
+
+jobject GetReferent(JNIEnv* env, jobject ref) {
+    if (gGetReferent == nullptr) {
+        jclass clazz = FindClassOrDie(env, "java/lang/ref/Reference");
+        gGetReferent = GetMethodIDOrDie(env, clazz, "get", "()Ljava/lang/Object;");
+    }
+    return env->CallObjectMethod(ref, gGetReferent);
+}
+
+} // namespace android

core/jni/core_jni_helpers.h

@@ -90,11 +90,10 @@ static inline int RegisterMethodsOrDie(JNIEnv* env, const char* className,
     return res;
 }
 
-static inline jobject jniGetReferent(JNIEnv* env, jobject ref) {
+/**
-    jclass cls = FindClassOrDie(env, "java/lang/ref/Reference");
+ * Returns the result of invoking java.lang.ref.Reference.get() on a Reference object.
-    jmethodID get = GetMethodIDOrDie(env, cls, "get", "()Ljava/lang/Object;");
+ */
-    return env->CallObjectMethod(ref, get);
+jobject GetReferent(JNIEnv* env, jobject ref);
-}
 
 /**
  * Read the specified field from jobject, and convert to std::string.