1 /*
2  * Copyright (C) 2022 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.server.art;
18 
19 import android.annotation.NonNull;
20 import android.annotation.Nullable;
21 import android.os.Build;
22 import android.os.SystemProperties;
23 import android.system.Os;
24 
25 /**
26  * A mockable wrapper class for device-specific constants.
27  *
28  * @hide
29  */
30 public class Constants {
Constants()31     private Constants() {}
32 
33     /** Returns the ABI that the device prefers. */
34     @NonNull
getPreferredAbi()35     public static String getPreferredAbi() {
36         return Build.SUPPORTED_ABIS[0];
37     }
38 
39     /** Returns the 64 bit ABI that is native to the device. */
40     @Nullable
getNative64BitAbi()41     public static String getNative64BitAbi() {
42         // The value comes from "ro.product.cpu.abilist64" and we assume that the first element is
43         // the native one.
44         return Build.SUPPORTED_64_BIT_ABIS.length > 0 ? Build.SUPPORTED_64_BIT_ABIS[0] : null;
45     }
46 
47     /** Returns the 32 bit ABI that is native to the device. */
48     @Nullable
getNative32BitAbi()49     public static String getNative32BitAbi() {
50         // The value comes from "ro.product.cpu.abilist32" and we assume that the first element is
51         // the native one.
52         return Build.SUPPORTED_32_BIT_ABIS.length > 0 ? Build.SUPPORTED_32_BIT_ABIS[0] : null;
53     }
54 
55     @Nullable
getenv(@onNull String name)56     public static String getenv(@NonNull String name) {
57         return Os.getenv(name);
58     }
59 
isBootImageProfilingEnabled()60     public static boolean isBootImageProfilingEnabled() {
61         boolean profileBootClassPath = SystemProperties.getBoolean(
62                 "persist.device_config.runtime_native_boot.profilebootclasspath",
63                 SystemProperties.getBoolean("dalvik.vm.profilebootclasspath", false /* def */));
64         return Build.isDebuggable() && profileBootClassPath;
65     }
66 }
67