Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3b5a09c1 authored by Nikolas Havrikov's avatar Nikolas Havrikov
Browse files

Refactor locking in input method framework 

This CL introduces a static global lock ImfLock.class to be used
instead of the mMethodMap. This allows to avoid erroneous warnings
from the errorprone checker.

Also, this CL fixes some cases, in which locked resources were
accessed without holding the appropriate lock.

Bug: 205676419
Test: atest CtsInputMethodTestCases
Test: RUN_ERROR_PRONE=true m services  -j | grep -e InputMethod | grep GuardedBy
Change-Id: If50984d23410b11eb5f8ae731e1c0c5ca92447c6
parent f724ab47

services/core/java/com/android/server/inputmethod/ImfLock.java

0 → 100644
+45 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2021 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.

 */



package com.android.server.inputmethod;



/**

 * The implicit lock of this class serves as the global lock for

 * the {@link InputMethodManagerService} and its controllers,

 * which contain the main logic of the input method framework (IMF).

 *

 * <p>

 * This lock can be used as follows in code:

 * <pre>

 * synchronized (ImfLock.class) {

 *   ...

 * }

 * </pre>

 *

 * <p>

 * For annotations, you can use a similar syntax:

 * <pre>

 * &#64;GuardedBy("ImfLock.class")

 * myMethodDeclaration() {

 *   ...

 * }

 * </pre>

 */

final class ImfLock {

    private ImfLock() {

        // no instances

    }

}

services/core/java/com/android/server/inputmethod/InputMethodBindingController.java

+40 −40
Original line number Diff line number Diff line
@@ -72,16 +72,16 @@ final class InputMethodBindingController { 
    @NonNull private final WindowManagerInternal mWindowManagerInternal;

    @NonNull private final Resources mRes;



    @GuardedBy("mMethodMap") private long mLastBindTime;

    @GuardedBy("mMethodMap") private boolean mHasConnection;

    @GuardedBy("mMethodMap") @Nullable private String mCurId;

    @GuardedBy("mMethodMap") @Nullable private String mSelectedMethodId;

    @GuardedBy("mMethodMap") @Nullable private Intent mCurIntent;

    @GuardedBy("mMethodMap") @Nullable private IInputMethod mCurMethod;

    @GuardedBy("mMethodMap") private int mCurMethodUid = Process.INVALID_UID;

    @GuardedBy("mMethodMap") private IBinder mCurToken;

    @GuardedBy("mMethodMap") private int mCurSeq;

    @GuardedBy("mMethodMap") private boolean mVisibleBound;

    @GuardedBy("ImfLock.class") private long mLastBindTime;

    @GuardedBy("ImfLock.class") private boolean mHasConnection;

    @GuardedBy("ImfLock.class") @Nullable private String mCurId;

    @GuardedBy("ImfLock.class") @Nullable private String mSelectedMethodId;

    @GuardedBy("ImfLock.class") @Nullable private Intent mCurIntent;

    @GuardedBy("ImfLock.class") @Nullable private IInputMethod mCurMethod;

    @GuardedBy("ImfLock.class") private int mCurMethodUid = Process.INVALID_UID;

    @GuardedBy("ImfLock.class") private IBinder mCurToken;

    @GuardedBy("ImfLock.class") private int mCurSeq;

    @GuardedBy("ImfLock.class") private boolean mVisibleBound;

    private boolean mSupportsStylusHw;



    /**
@@ -146,7 +146,7 @@ final class InputMethodBindingController { 
     * Time that we last initiated a bind to the input method, to determine

     * if we should try to disconnect and reconnect to it.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    long getLastBindTime() {

        return mLastBindTime;

    }
@@ -155,7 +155,7 @@ final class InputMethodBindingController { 
     * Set to true if our ServiceConnection is currently actively bound to

     * a service (whether or not we have gotten its IBinder back yet).

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    boolean hasConnection() {

        return mHasConnection;

    }
@@ -168,7 +168,7 @@ final class InputMethodBindingController { 
     *

     * @see #getSelectedMethodId()

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    @Nullable

    String getCurId() {

        return mCurId;
@@ -187,13 +187,13 @@ final class InputMethodBindingController { 
     *

     * @see #getCurId()

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    @Nullable

    String getSelectedMethodId() {

        return mSelectedMethodId;

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    void setSelectedMethodId(@Nullable String selectedMethodId) {

        mSelectedMethodId = selectedMethodId;

    }
@@ -202,7 +202,7 @@ final class InputMethodBindingController { 
     * The token we have made for the currently active input method, to

     * identify it in the future.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    IBinder getCurToken() {

        return mCurToken;

    }
@@ -210,7 +210,7 @@ final class InputMethodBindingController { 
    /**

     * The Intent used to connect to the current input method.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    @Nullable

    Intent getCurIntent() {

        return mCurIntent;
@@ -220,7 +220,7 @@ final class InputMethodBindingController { 
     * The current binding sequence number, incremented every time there is

     * a new bind performed.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    int getSequenceNumber() {

        return mCurSeq;

    }
@@ -229,7 +229,7 @@ final class InputMethodBindingController { 
     * Increase the current binding sequence number by one.

     * Reset to 1 on overflow.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    void advanceSequenceNumber() {

        mCurSeq += 1;

        if (mCurSeq <= 0) {
@@ -241,7 +241,7 @@ final class InputMethodBindingController { 
     * If non-null, this is the input method service we are currently connected

     * to.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    @Nullable

    IInputMethod getCurMethod() {

        return mCurMethod;
@@ -250,7 +250,7 @@ final class InputMethodBindingController { 
    /**

     * If not {@link Process#INVALID_UID}, then the UID of {@link #getCurIntent()}.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    int getCurMethodUid() {

        return mCurMethodUid;

    }
@@ -258,7 +258,7 @@ final class InputMethodBindingController { 
    /**

     * Indicates whether {@link #mVisibleConnection} is currently in use.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    boolean isVisibleBound() {

        return mVisibleBound;

    }
@@ -266,10 +266,10 @@ final class InputMethodBindingController { 
    /**

     * Used to bring IME service up to visible adjustment while it is being shown.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private final ServiceConnection mVisibleConnection = new ServiceConnection() {

        @Override public void onBindingDied(ComponentName name) {

            synchronized (mMethodMap) {

            synchronized (ImfLock.class) {

                if (mVisibleBound) {

                    unbindVisibleConnection();

                }
@@ -286,12 +286,12 @@ final class InputMethodBindingController { 
    /**

     * Used to bind the IME while it is not currently being shown.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private final ServiceConnection mMainConnection = new ServiceConnection() {

        @Override

        public void onServiceConnected(ComponentName name, IBinder service) {

            Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "IMMS.onServiceConnected");

            synchronized (mMethodMap) {

            synchronized (ImfLock.class) {

                if (mCurIntent != null && name.equals(mCurIntent.getComponent())) {

                    mCurMethod = IInputMethod.Stub.asInterface(service);

                    updateCurrentMethodUid();
@@ -318,7 +318,7 @@ final class InputMethodBindingController { 
            Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);

        }



        @GuardedBy("mMethodMap")

        @GuardedBy("ImfLock.class")

        private void updateCurrentMethodUid() {

            final String curMethodPackage = mCurIntent.getComponent().getPackageName();

            final int curMethodUid = mPackageManagerInternal.getPackageUid(
@@ -344,7 +344,7 @@ final class InputMethodBindingController { 
            // refreshed when this method is called back.  Running

            //    adb install -r <APK that implements the current IME>

            // would be a good way to trigger such a situation.

            synchronized (mMethodMap) {

            synchronized (ImfLock.class) {

                if (DEBUG) {

                    Slog.v(TAG, "Service disconnected: " + name + " mCurIntent=" + mCurIntent);

                }
@@ -361,7 +361,7 @@ final class InputMethodBindingController { 
        }

    };



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    void unbindCurrentMethod() {

        if (mVisibleBound) {

            unbindVisibleConnection();
@@ -380,14 +380,14 @@ final class InputMethodBindingController { 
        clearCurMethodAndSessions();

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private void clearCurMethodAndSessions() {

        mService.clearClientSessionsLocked();

        mCurMethod = null;

        mCurMethodUid = Process.INVALID_UID;

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private void removeCurrentToken() {

        int curTokenDisplayId = mService.getCurTokenDisplayIdLocked();
@@ -400,7 +400,7 @@ final class InputMethodBindingController { 
        mCurToken = null;

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    @NonNull

    InputBindResult bindCurrentMethod() {

        InputMethodInfo info = mMethodMap.get(mSelectedMethodId);
@@ -438,7 +438,7 @@ final class InputMethodBindingController { 
        return intent;

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private void addFreshWindowToken() {

        int displayIdToShowIme = mService.getDisplayIdToShowImeLocked();

        mCurToken = new Binder();
@@ -458,19 +458,19 @@ final class InputMethodBindingController { 
        }

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private void unbindMainConnection() {

        mContext.unbindService(mMainConnection);

        mHasConnection = false;

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    void unbindVisibleConnection() {

        mContext.unbindService(mVisibleConnection);

        mVisibleBound = false;

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private boolean bindCurrentInputMethodService(ServiceConnection conn, int flags) {

        if (mCurIntent == null || conn == null) {

            Slog.e(TAG, "--- bind failed: service = " + mCurIntent + ", conn = " + conn);
@@ -480,14 +480,14 @@ final class InputMethodBindingController { 
                new UserHandle(mSettings.getCurrentUserId()));

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private boolean bindCurrentInputMethodServiceVisibleConnection() {

        mVisibleBound = bindCurrentInputMethodService(mVisibleConnection,

                IME_VISIBLE_BIND_FLAGS);

        return mVisibleBound;

    }



    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    private boolean bindCurrentInputMethodServiceMainConnection() {

        mHasConnection = bindCurrentInputMethodService(mMainConnection,

                mImeConnectionBindFlags);
@@ -500,7 +500,7 @@ final class InputMethodBindingController { 
     * <p>

     * Performs a rebind if no binding is achieved in {@link #TIME_TO_RECONNECT} milliseconds.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    void setCurrentMethodVisible() {

        if (mCurMethod != null) {

            if (DEBUG) Slog.d(TAG, "setCurrentMethodVisible: mCurToken=" + mCurToken);
@@ -541,7 +541,7 @@ final class InputMethodBindingController { 
    /**

     * Remove the binding needed for the IME to be shown.

     */

    @GuardedBy("mMethodMap")

    @GuardedBy("ImfLock.class")

    void setCurrentMethodNotVisible() {

        if (mVisibleBound) {

            unbindVisibleConnection();