| // Copyright (c) 2021, the R8 project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| package com.android.tools.r8.apimodel; |
| |
| import com.android.tools.r8.TestBase; |
| import com.android.tools.r8.androidapi.AndroidApiLevelHashingDatabaseImpl; |
| import com.android.tools.r8.apimodel.AndroidApiVersionsXmlParser.ParsedApiClass; |
| import com.android.tools.r8.graph.DexField; |
| import com.android.tools.r8.graph.DexItemFactory; |
| import com.android.tools.r8.graph.DexMember; |
| import com.android.tools.r8.graph.DexMethod; |
| import com.android.tools.r8.graph.DexReference; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.references.ClassReference; |
| import com.android.tools.r8.utils.AndroidApiLevel; |
| import com.android.tools.r8.utils.Pair; |
| import com.android.tools.r8.utils.structural.DefaultHashingVisitor; |
| import com.android.tools.r8.utils.structural.HasherWrapper; |
| import com.android.tools.r8.utils.structural.StructuralItem; |
| import java.io.FileOutputStream; |
| import java.io.ObjectOutputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.IdentityHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.function.BiConsumer; |
| |
| public class AndroidApiHashingDatabaseBuilderGenerator extends TestBase { |
| |
| /** |
| * Generate the information needed for looking up api level of references in the android.jar. This |
| * method will generate three different files and store them in the passed paths. pathToIndices |
| * will be an int array with hashcode entries for each DexReference. The pathToApiLevels is a byte |
| * array with a byte describing the api level that the index in pathToIndices has. To ensure that |
| * this lookup work the generate algorithm tracks all colliding hash codes such and stores them in |
| * another format. The indices map is populated with all colliding entries and a -1 is inserted |
| * for the api level. |
| */ |
| public static void generate( |
| List<ParsedApiClass> apiClasses, |
| Path pathToIndices, |
| Path pathToApiLevels, |
| Path ambiguousDefinitions) |
| throws Exception { |
| Map<ClassReference, Map<DexMethod, AndroidApiLevel>> methodMap = new HashMap<>(); |
| Map<ClassReference, Map<DexField, AndroidApiLevel>> fieldMap = new HashMap<>(); |
| Map<ClassReference, ParsedApiClass> lookupMap = new HashMap<>(); |
| DexItemFactory factory = new DexItemFactory(); |
| |
| Map<Integer, AndroidApiLevel> apiLevelMap = new HashMap<>(); |
| Map<Integer, Pair<DexReference, AndroidApiLevel>> reverseMap = new HashMap<>(); |
| Map<AndroidApiLevel, Set<DexReference>> ambiguousMap = new HashMap<>(); |
| // Populate maps for faster lookup. |
| for (ParsedApiClass apiClass : apiClasses) { |
| DexType type = factory.createType(apiClass.getClassReference().getDescriptor()); |
| AndroidApiLevel existing = apiLevelMap.put(type.hashCode(), apiClass.getApiLevel()); |
| assert existing == null; |
| reverseMap.put(type.hashCode(), Pair.create(type, apiClass.getApiLevel())); |
| } |
| |
| for (ParsedApiClass apiClass : apiClasses) { |
| Map<DexMethod, AndroidApiLevel> methodsForApiClass = new HashMap<>(); |
| apiClass.visitMethodReferences( |
| (apiLevel, methods) -> { |
| methods.forEach( |
| method -> methodsForApiClass.put(factory.createMethod(method), apiLevel)); |
| }); |
| Map<DexField, AndroidApiLevel> fieldsForApiClass = new HashMap<>(); |
| apiClass.visitFieldReferences( |
| (apiLevel, fields) -> { |
| fields.forEach(field -> fieldsForApiClass.put(factory.createField(field), apiLevel)); |
| }); |
| methodMap.put(apiClass.getClassReference(), methodsForApiClass); |
| fieldMap.put(apiClass.getClassReference(), fieldsForApiClass); |
| lookupMap.put(apiClass.getClassReference(), apiClass); |
| } |
| |
| BiConsumer<DexReference, AndroidApiLevel> addConsumer = |
| addReferenceToMaps(apiLevelMap, reverseMap, ambiguousMap); |
| |
| for (ParsedApiClass apiClass : apiClasses) { |
| computeAllReferencesInHierarchy( |
| lookupMap, |
| factory, |
| factory.createType(apiClass.getClassReference().getDescriptor()), |
| apiClass, |
| AndroidApiLevel.B, |
| new IdentityHashMap<>()) |
| .forEach(addConsumer); |
| } |
| |
| int[] indices = new int[apiLevelMap.size()]; |
| byte[] apiLevel = new byte[apiLevelMap.size()]; |
| ArrayList<Integer> integers = new ArrayList<>(apiLevelMap.keySet()); |
| for (int i = 0; i < integers.size(); i++) { |
| indices[i] = integers.get(i); |
| AndroidApiLevel androidApiLevel = apiLevelMap.get(integers.get(i)); |
| apiLevel[i] = |
| (byte) (androidApiLevel == AndroidApiLevel.NOT_SET ? -1 : androidApiLevel.getLevel()); |
| } |
| |
| try (FileOutputStream fileOutputStream = new FileOutputStream(pathToIndices.toFile()); |
| ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream)) { |
| objectOutputStream.writeObject(indices); |
| } |
| |
| try (FileOutputStream fileOutputStream = new FileOutputStream(pathToApiLevels.toFile()); |
| ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream)) { |
| objectOutputStream.writeObject(apiLevel); |
| } |
| |
| String ambiguousMapSerialized = serializeAmbiguousMap(ambiguousMap); |
| Files.write(ambiguousDefinitions, ambiguousMapSerialized.getBytes(StandardCharsets.UTF_8)); |
| } |
| |
| /** This will serialize a collection of DexReferences with the api level they correspond to. */ |
| private static String serializeAmbiguousMap( |
| Map<AndroidApiLevel, Set<DexReference>> ambiguousMap) { |
| Set<String> seen = new HashSet<>(); |
| StringBuilder sb = new StringBuilder(); |
| ambiguousMap.forEach( |
| (apiLevel, references) -> { |
| references.forEach( |
| reference -> { |
| HasherWrapper defaultHasher = AndroidApiLevelHashingDatabaseImpl.getDefaultHasher(); |
| reference.accept( |
| type -> DefaultHashingVisitor.run(type, defaultHasher, DexType::acceptHashing), |
| field -> |
| DefaultHashingVisitor.run( |
| field, defaultHasher, StructuralItem::acceptHashing), |
| method -> |
| DefaultHashingVisitor.run( |
| method, defaultHasher, StructuralItem::acceptHashing)); |
| String referenceHash = defaultHasher.hash().toString(); |
| if (!seen.add(referenceHash)) { |
| throw new RuntimeException( |
| "More than one item with key: <" |
| + referenceHash |
| + ">. The choice of key encoding will need to change to generate a valid" |
| + " api database"); |
| } |
| sb.append(referenceHash).append(":").append(apiLevel.getLevel()).append("\n"); |
| }); |
| }); |
| return sb.toString(); |
| } |
| |
| private static BiConsumer<DexReference, AndroidApiLevel> addReferenceToMaps( |
| Map<Integer, AndroidApiLevel> apiLevelMap, |
| Map<Integer, Pair<DexReference, AndroidApiLevel>> reverseMap, |
| Map<AndroidApiLevel, Set<DexReference>> ambiguousMap) { |
| return ((reference, apiLevel) -> { |
| AndroidApiLevel existingMethod = apiLevelMap.put(reference.hashCode(), apiLevel); |
| if (existingMethod != null) { |
| apiLevelMap.put(reference.hashCode(), AndroidApiLevel.NOT_SET); |
| Pair<DexReference, AndroidApiLevel> existingPair = reverseMap.get(reference.hashCode()); |
| addAmbiguousEntry(existingPair.getSecond(), existingPair.getFirst(), ambiguousMap); |
| addAmbiguousEntry(apiLevel, reference, ambiguousMap); |
| } else { |
| reverseMap.put(reference.hashCode(), Pair.create(reference, apiLevel)); |
| } |
| }); |
| } |
| |
| private static void addAmbiguousEntry( |
| AndroidApiLevel apiLevel, |
| DexReference reference, |
| Map<AndroidApiLevel, Set<DexReference>> ambiguousMap) { |
| ambiguousMap.computeIfAbsent(apiLevel, ignored -> new HashSet<>()).add(reference); |
| } |
| |
| @SuppressWarnings("unchecked") |
| private static <T extends DexMember<?, ?>> |
| Map<T, AndroidApiLevel> computeAllReferencesInHierarchy( |
| Map<ClassReference, ParsedApiClass> lookupMap, |
| DexItemFactory factory, |
| DexType holder, |
| ParsedApiClass apiClass, |
| AndroidApiLevel linkLevel, |
| Map<T, AndroidApiLevel> additionMap) { |
| if (!apiClass.getClassReference().getDescriptor().equals(factory.objectDescriptor.toString())) { |
| apiClass.visitMethodReferences( |
| (apiLevel, methodReferences) -> { |
| methodReferences.forEach( |
| methodReference -> { |
| T member = (T) factory.createMethod(methodReference).withHolder(holder, factory); |
| addIfNewOrApiLevelIsLower(linkLevel, additionMap, apiLevel, member); |
| }); |
| }); |
| apiClass.visitFieldReferences( |
| (apiLevel, fieldReferences) -> { |
| fieldReferences.forEach( |
| fieldReference -> { |
| T member = (T) factory.createField(fieldReference).withHolder(holder, factory); |
| addIfNewOrApiLevelIsLower(linkLevel, additionMap, apiLevel, member); |
| }); |
| }); |
| apiClass.visitSuperType( |
| (superType, apiLevel) -> { |
| computeAllReferencesInHierarchy( |
| lookupMap, |
| factory, |
| holder, |
| lookupMap.get(superType), |
| linkLevel.max(apiLevel), |
| additionMap); |
| }); |
| apiClass.visitInterface( |
| (iFace, apiLevel) -> { |
| computeAllReferencesInHierarchy( |
| lookupMap, |
| factory, |
| holder, |
| lookupMap.get(iFace), |
| linkLevel.max(apiLevel), |
| additionMap); |
| }); |
| } |
| return additionMap; |
| } |
| |
| private static <T extends DexMember<?, ?>> void addIfNewOrApiLevelIsLower( |
| AndroidApiLevel linkLevel, |
| Map<T, AndroidApiLevel> additionMap, |
| AndroidApiLevel apiLevel, |
| T member) { |
| AndroidApiLevel currentApiLevel = apiLevel.max(linkLevel); |
| AndroidApiLevel existingApiLevel = additionMap.get(member); |
| if (existingApiLevel == null || currentApiLevel.isLessThanOrEqualTo(existingApiLevel)) { |
| additionMap.put(member, currentApiLevel); |
| } |
| } |
| } |
