| // Copyright (c) 2020, 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.horizontalclassmerging; |
| |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.DexField; |
| import com.android.tools.r8.graph.DexMethod; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.GraphLens; |
| import com.android.tools.r8.graph.GraphLens.NestedGraphLens; |
| import com.android.tools.r8.graph.RewrittenPrototypeDescription; |
| import com.android.tools.r8.ir.conversion.ExtraParameter; |
| import com.android.tools.r8.utils.IterableUtils; |
| import com.android.tools.r8.utils.collections.BidirectionalManyToOneRepresentativeHashMap; |
| import com.android.tools.r8.utils.collections.BidirectionalManyToOneRepresentativeMap; |
| import com.android.tools.r8.utils.collections.BidirectionalOneToOneMap; |
| import com.android.tools.r8.utils.collections.MutableBidirectionalManyToOneRepresentativeMap; |
| import com.google.common.collect.BiMap; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.Streams; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.IdentityHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.function.Function; |
| |
| public class HorizontalClassMergerGraphLens extends NestedGraphLens { |
| |
| private final Map<DexMethod, List<ExtraParameter>> methodExtraParameters; |
| private final Map<DexMethod, DexMethod> extraOriginalMethodSignatures; |
| private final HorizontallyMergedClasses mergedClasses; |
| |
| private HorizontalClassMergerGraphLens( |
| AppView<?> appView, |
| HorizontallyMergedClasses mergedClasses, |
| Map<DexMethod, List<ExtraParameter>> methodExtraParameters, |
| BidirectionalManyToOneRepresentativeMap<DexField, DexField> fieldMap, |
| Map<DexMethod, DexMethod> methodMap, |
| BidirectionalOneToOneMap<DexMethod, DexMethod> originalMethodSignatures, |
| Map<DexMethod, DexMethod> extraOriginalMethodSignatures, |
| GraphLens previousLens) { |
| super( |
| mergedClasses.getForwardMap(), |
| methodMap, |
| fieldMap, |
| originalMethodSignatures, |
| previousLens, |
| appView.dexItemFactory()); |
| this.methodExtraParameters = methodExtraParameters; |
| this.extraOriginalMethodSignatures = extraOriginalMethodSignatures; |
| this.mergedClasses = mergedClasses; |
| } |
| |
| private boolean isSynthesizedByHorizontalClassMerging(DexMethod method) { |
| return methodExtraParameters.containsKey(method); |
| } |
| |
| @Override |
| protected Iterable<DexType> internalGetOriginalTypes(DexType previous) { |
| return IterableUtils.prependSingleton(previous, mergedClasses.getSourcesFor(previous)); |
| } |
| |
| @Override |
| public RewrittenPrototypeDescription lookupPrototypeChangesForMethodDefinition(DexMethod method) { |
| if (isSynthesizedByHorizontalClassMerging(method)) { |
| // If we are processing the call site, the arguments should be removed. |
| return RewrittenPrototypeDescription.none(); |
| } |
| return super.lookupPrototypeChangesForMethodDefinition(method); |
| } |
| |
| @Override |
| public DexMethod getOriginalMethodSignature(DexMethod method) { |
| DexMethod originalConstructor = extraOriginalMethodSignatures.get(method); |
| if (originalConstructor == null) { |
| return super.getOriginalMethodSignature(method); |
| } |
| return getPrevious().getOriginalMethodSignature(originalConstructor); |
| } |
| |
| /** |
| * If an overloaded constructor is requested, add the constructor id as a parameter to the |
| * constructor. Otherwise return the lookup on the underlying graph lens. |
| */ |
| @Override |
| public MethodLookupResult internalDescribeLookupMethod( |
| MethodLookupResult previous, DexMethod context) { |
| List<ExtraParameter> extraParameters = methodExtraParameters.get(previous.getReference()); |
| MethodLookupResult lookup = super.internalDescribeLookupMethod(previous, context); |
| if (extraParameters == null) { |
| return lookup; |
| } |
| return MethodLookupResult.builder(this) |
| .setReference(lookup.getReference()) |
| .setPrototypeChanges(lookup.getPrototypeChanges().withExtraParameters(extraParameters)) |
| .setType(lookup.getType()) |
| .build(); |
| } |
| |
| public static class Builder { |
| private MutableBidirectionalManyToOneRepresentativeMap<DexField, DexField> fieldMap = |
| new BidirectionalManyToOneRepresentativeHashMap<>(); |
| private ManyToOneMap<DexMethod, DexMethod> methodMap = new ManyToOneMap<>(); |
| private final Map<DexMethod, List<ExtraParameter>> methodExtraParameters = |
| new IdentityHashMap<>(); |
| |
| Builder() {} |
| |
| public HorizontalClassMergerGraphLens build( |
| AppView<?> appView, HorizontallyMergedClasses mergedClasses) { |
| ManyToOneInverseMap<DexMethod, DexMethod> inverseMethodMap = |
| methodMap.inverse( |
| group -> { |
| // Every group should have a representative. Fail in debug mode. |
| assert false; |
| return group.iterator().next(); |
| }); |
| return new HorizontalClassMergerGraphLens( |
| appView, |
| mergedClasses, |
| methodExtraParameters, |
| fieldMap, |
| methodMap.getForwardMap(), |
| inverseMethodMap.getBiMap(), |
| inverseMethodMap.getExtraMap(), |
| appView.graphLens()); |
| } |
| |
| public void remapMethods(BiMap<DexMethod, DexMethod> remapMethods) { |
| methodMap = methodMap.remap(remapMethods, Function.identity(), Function.identity()); |
| } |
| |
| Builder recordNewFieldSignature(DexField oldFieldSignature, DexField newFieldSignature) { |
| Set<DexField> originalFieldSignatures = fieldMap.removeValue(oldFieldSignature); |
| if (originalFieldSignatures.isEmpty()) { |
| fieldMap.put(oldFieldSignature, newFieldSignature); |
| } else if (originalFieldSignatures.size() == 1) { |
| fieldMap.put(originalFieldSignatures.iterator().next(), newFieldSignature); |
| } else { |
| for (DexField originalFieldSignature : originalFieldSignatures) { |
| fieldMap.put(originalFieldSignature, newFieldSignature); |
| } |
| DexField representative = fieldMap.removeRepresentativeFor(oldFieldSignature); |
| assert representative != null; |
| fieldMap.setRepresentative(newFieldSignature, representative); |
| } |
| return this; |
| } |
| |
| Builder recordNewFieldSignature( |
| Iterable<DexField> oldFieldSignatures, |
| DexField newFieldSignature, |
| DexField representative) { |
| assert Streams.stream(oldFieldSignatures).noneMatch(fieldMap::containsValue); |
| assert Iterables.contains(oldFieldSignatures, representative); |
| for (DexField oldFieldSignature : oldFieldSignatures) { |
| fieldMap.put(oldFieldSignature, newFieldSignature); |
| } |
| fieldMap.setRepresentative(newFieldSignature, representative); |
| return this; |
| } |
| |
| /** Unidirectional mapping from one method to another. */ |
| public Builder recordExtraOriginalSignature(DexMethod from, DexMethod to) { |
| methodMap.setRepresentative(from, to); |
| return this; |
| } |
| |
| /** Unidirectional mapping from one method to another. */ |
| public Builder mapMethod(DexMethod from, DexMethod to) { |
| methodMap.put(from, to); |
| return this; |
| } |
| |
| /** Unidirectional mapping from one method to another. */ |
| public Builder mapMethodInverse(DexMethod from, DexMethod to) { |
| methodMap.putInverse(from, to); |
| return this; |
| } |
| |
| public Builder moveMethod(DexMethod from, DexMethod to) { |
| mapMethod(from, to); |
| mapMethodInverse(from, to); |
| return this; |
| } |
| |
| /** |
| * One way mapping from one constructor to another. This is used for synthesized constructors, |
| * where many constructors are merged into a single constructor. The synthesized constructor |
| * therefore does not have a unique reverse constructor. |
| */ |
| public Builder moveMergedConstructor( |
| DexMethod from, DexMethod to, List<ExtraParameter> extraParameters) { |
| moveMethod(from, to); |
| methodExtraParameters.put(from, extraParameters); |
| return this; |
| } |
| |
| public Builder addExtraParameters(DexMethod to, List<ExtraParameter> extraParameters) { |
| Set<DexMethod> mapsFrom = methodMap.lookupReverse(to); |
| if (mapsFrom == null) { |
| mapsFrom = Collections.singleton(to); |
| } |
| mapsFrom.forEach( |
| originalFrom -> |
| methodExtraParameters |
| .computeIfAbsent(originalFrom, ignore -> new ArrayList<>(extraParameters.size())) |
| .addAll(extraParameters)); |
| return this; |
| } |
| } |
| } |