1 /* 2 * Copyright (C) 2016 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.pm; 18 19 import android.os.SystemProperties; 20 21 import dalvik.system.DexFile; 22 23 /** 24 * Manage (retrieve) mappings from compilation reason to compilation filter. 25 */ 26 public class PackageManagerServiceCompilerMapping { 27 // Names for compilation reasons. 28 static final String REASON_STRINGS[] = { 29 "first-boot", "boot", "install", "bg-dexopt", "ab-ota", "inactive", "shared" 30 }; 31 32 static final int REASON_SHARED_INDEX = 6; 33 34 // Static block to ensure the strings array is of the right length. 35 static { 36 if (PackageManagerService.REASON_LAST + 1 != REASON_STRINGS.length) { 37 throw new IllegalStateException("REASON_STRINGS not correct"); 38 } 39 if (!"shared".equals(REASON_STRINGS[REASON_SHARED_INDEX])) { 40 throw new IllegalStateException("REASON_STRINGS not correct because of shared index"); 41 } 42 } 43 getSystemPropertyName(int reason)44 private static String getSystemPropertyName(int reason) { 45 if (reason < 0 || reason >= REASON_STRINGS.length) { 46 throw new IllegalArgumentException("reason " + reason + " invalid"); 47 } 48 49 return "pm.dexopt." + REASON_STRINGS[reason]; 50 } 51 52 // Load the property for the given reason and check for validity. This will throw an 53 // exception in case the reason or value are invalid. getAndCheckValidity(int reason)54 private static String getAndCheckValidity(int reason) { 55 String sysPropValue = SystemProperties.get(getSystemPropertyName(reason)); 56 if (sysPropValue == null || sysPropValue.isEmpty() || 57 !DexFile.isValidCompilerFilter(sysPropValue)) { 58 throw new IllegalStateException("Value \"" + sysPropValue +"\" not valid " 59 + "(reason " + REASON_STRINGS[reason] + ")"); 60 } else if (!isFilterAllowedForReason(reason, sysPropValue)) { 61 throw new IllegalStateException("Value \"" + sysPropValue +"\" not allowed " 62 + "(reason " + REASON_STRINGS[reason] + ")"); 63 } 64 65 return sysPropValue; 66 } 67 isFilterAllowedForReason(int reason, String filter)68 private static boolean isFilterAllowedForReason(int reason, String filter) { 69 return reason != REASON_SHARED_INDEX || !DexFile.isProfileGuidedCompilerFilter(filter); 70 } 71 72 // Check that the properties are set and valid. 73 // Note: this is done in a separate method so this class can be statically initialized. checkProperties()74 static void checkProperties() { 75 // We're gonna check all properties and collect the exceptions, so we can give a general 76 // overview. Store the exceptions here. 77 RuntimeException toThrow = null; 78 79 for (int reason = 0; reason <= PackageManagerService.REASON_LAST; reason++) { 80 try { 81 // Check that the system property name is legal. 82 String sysPropName = getSystemPropertyName(reason); 83 if (sysPropName == null || sysPropName.isEmpty()) { 84 throw new IllegalStateException("Reason system property name \"" + 85 sysPropName +"\" for reason " + REASON_STRINGS[reason]); 86 } 87 88 // Check validity, ignore result. 89 getAndCheckValidity(reason); 90 } catch (Exception exc) { 91 if (toThrow == null) { 92 toThrow = new IllegalStateException("PMS compiler filter settings are bad."); 93 } 94 toThrow.addSuppressed(exc); 95 } 96 } 97 98 if (toThrow != null) { 99 throw toThrow; 100 } 101 } 102 getCompilerFilterForReason(int reason)103 public static String getCompilerFilterForReason(int reason) { 104 return getAndCheckValidity(reason); 105 } 106 107 /** 108 * Return the default compiler filter for compilation. 109 * 110 * We derive that from the traditional "dalvik.vm.dex2oat-filter" property and just make 111 * sure this isn't profile-guided. Returns "speed" in case of invalid (or missing) values. 112 */ getDefaultCompilerFilter()113 public static String getDefaultCompilerFilter() { 114 String value = SystemProperties.get("dalvik.vm.dex2oat-filter"); 115 if (value == null || value.isEmpty()) { 116 return "speed"; 117 } 118 119 if (!DexFile.isValidCompilerFilter(value) || 120 DexFile.isProfileGuidedCompilerFilter(value)) { 121 return "speed"; 122 } 123 124 return value; 125 } 126 } 127