| // Copyright (c) 2018, 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.shaking; |
| |
| import com.android.tools.r8.graph.AppInfo; |
| import com.android.tools.r8.graph.DexEncodedMethod; |
| import com.android.tools.r8.graph.DexField; |
| import com.android.tools.r8.graph.DexItemFactory; |
| import com.android.tools.r8.graph.DexMethod; |
| import com.android.tools.r8.graph.DexProto; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.GraphLense; |
| import com.android.tools.r8.graph.GraphLense.NestedGraphLense; |
| import com.android.tools.r8.ir.code.Invoke.Type; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.ImmutableSet; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| // This graph lense is instantiated during vertical class merging. The graph lense is context |
| // sensitive in the enclosing class of a given invoke *and* the type of the invoke (e.g., invoke- |
| // super vs invoke-virtual). This is illustrated by the following example. |
| // |
| // public class A { |
| // public void m() { ... } |
| // } |
| // public class B extends A { |
| // @Override |
| // public void m() { invoke-super A.m(); ... } |
| // |
| // public void m2() { invoke-virtual A.m(); ... } |
| // } |
| // |
| // Vertical class merging will merge class A into class B. Since class B already has a method with |
| // the signature "void B.m()", the method A.m will be given a fresh name and moved to class B. |
| // During this process, the method corresponding to A.m will be made private such that it can be |
| // called via an invoke-direct instruction. |
| // |
| // For the invocation "invoke-super A.m()" in B.m, this graph lense will return the newly created, |
| // private method corresponding to A.m (that is now in B.m with a fresh name), such that the |
| // invocation will hit the same implementation as the original super.m() call. |
| // |
| // For the invocation "invoke-virtual A.m()" in B.m2, this graph lense will return the method B.m. |
| public class VerticalClassMergerGraphLense extends NestedGraphLense { |
| private final AppInfo appInfo; |
| |
| private final Set<DexMethod> mergedMethods; |
| private final Map<DexType, Map<DexMethod, DexMethod>> contextualVirtualToDirectMethodMaps; |
| |
| public VerticalClassMergerGraphLense( |
| AppInfo appInfo, |
| Map<DexField, DexField> fieldMap, |
| Map<DexMethod, DexMethod> methodMap, |
| Set<DexMethod> mergedMethods, |
| Map<DexType, Map<DexMethod, DexMethod>> contextualVirtualToDirectMethodMaps, |
| GraphLense previousLense) { |
| super(ImmutableMap.of(), methodMap, fieldMap, previousLense, appInfo.dexItemFactory); |
| this.appInfo = appInfo; |
| this.mergedMethods = mergedMethods; |
| this.contextualVirtualToDirectMethodMaps = contextualVirtualToDirectMethodMaps; |
| } |
| |
| public static Builder builder(AppInfo appInfo) { |
| return new Builder(appInfo); |
| } |
| |
| @Override |
| public GraphLenseLookupResult lookupMethod( |
| DexMethod method, DexEncodedMethod context, Type type) { |
| assert isContextFreeForMethod(method) || (context != null && type != null); |
| GraphLenseLookupResult previous = previousLense.lookupMethod(method, context, type); |
| if (previous.getType() == Type.SUPER && !mergedMethods.contains(context.method)) { |
| Map<DexMethod, DexMethod> virtualToDirectMethodMap = |
| contextualVirtualToDirectMethodMaps.get(context.method.holder); |
| if (virtualToDirectMethodMap != null) { |
| DexMethod directMethod = virtualToDirectMethodMap.get(previous.getMethod()); |
| if (directMethod != null) { |
| // If the super class A of the enclosing class B (i.e., context.method.holder) |
| // has been merged into B during vertical class merging, and this invoke-super instruction |
| // was resolving to a method in A, then the target method has been changed to a direct |
| // method and moved into B, so that we need to use an invoke-direct instruction instead of |
| // invoke-super. |
| return new GraphLenseLookupResult(directMethod, Type.DIRECT); |
| } |
| } |
| } |
| return super.lookupMethod(previous.getMethod(), context, previous.getType()); |
| } |
| |
| @Override |
| protected Type mapInvocationType( |
| DexMethod newMethod, DexMethod originalMethod, DexEncodedMethod context, Type type) { |
| return super.mapVirtualInterfaceInvocationTypes( |
| appInfo, newMethod, originalMethod, context, type); |
| } |
| |
| @Override |
| public Set<DexMethod> lookupMethodInAllContexts(DexMethod method) { |
| ImmutableSet.Builder<DexMethod> builder = ImmutableSet.builder(); |
| for (DexMethod previous : previousLense.lookupMethodInAllContexts(method)) { |
| builder.add(methodMap.getOrDefault(previous, previous)); |
| for (Map<DexMethod, DexMethod> virtualToDirectMethodMap : |
| contextualVirtualToDirectMethodMaps.values()) { |
| DexMethod directMethod = virtualToDirectMethodMap.get(previous); |
| if (directMethod != null) { |
| builder.add(directMethod); |
| } |
| } |
| } |
| return builder.build(); |
| } |
| |
| @Override |
| public boolean isContextFreeForMethods() { |
| return contextualVirtualToDirectMethodMaps.isEmpty() && previousLense.isContextFreeForMethods(); |
| } |
| |
| @Override |
| public boolean isContextFreeForMethod(DexMethod method) { |
| if (!previousLense.isContextFreeForMethod(method)) { |
| return false; |
| } |
| DexMethod previous = previousLense.lookupMethod(method); |
| for (Map<DexMethod, DexMethod> virtualToDirectMethodMap : |
| contextualVirtualToDirectMethodMaps.values()) { |
| if (virtualToDirectMethodMap.containsKey(previous)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| public static class Builder { |
| private final AppInfo appInfo; |
| |
| private final ImmutableMap.Builder<DexField, DexField> fieldMapBuilder = ImmutableMap.builder(); |
| private final ImmutableMap.Builder<DexMethod, DexMethod> methodMapBuilder = |
| ImmutableMap.builder(); |
| private final ImmutableSet.Builder<DexMethod> mergedMethodsBuilder = ImmutableSet.builder(); |
| private final Map<DexType, Map<DexMethod, DexMethod>> contextualVirtualToDirectMethodMaps = |
| new HashMap<>(); |
| |
| private Builder(AppInfo appInfo) { |
| this.appInfo = appInfo; |
| } |
| |
| public GraphLense build( |
| GraphLense previousLense, |
| Map<DexType, DexType> mergedClasses, |
| DexItemFactory dexItemFactory) { |
| Map<DexField, DexField> fieldMap = fieldMapBuilder.build(); |
| Map<DexMethod, DexMethod> methodMap = methodMapBuilder.build(); |
| if (fieldMap.isEmpty() |
| && methodMap.isEmpty() |
| && contextualVirtualToDirectMethodMaps.isEmpty()) { |
| return previousLense; |
| } |
| return new VerticalClassMergerGraphLense( |
| appInfo, |
| fieldMap, |
| methodMap, |
| getMergedMethodSignaturesAfterClassMerging( |
| mergedMethodsBuilder.build(), mergedClasses, dexItemFactory), |
| contextualVirtualToDirectMethodMaps, |
| previousLense); |
| } |
| |
| // After we have recorded that a method "a.b.c.Foo;->m(A, B, C)V" was merged into another class, |
| // it could be that the class B was merged into its subclass B'. In that case we update the |
| // signature to "a.b.c.Foo;->m(A, B', C)V". |
| private Set<DexMethod> getMergedMethodSignaturesAfterClassMerging( |
| Set<DexMethod> mergedMethods, |
| Map<DexType, DexType> mergedClasses, |
| DexItemFactory dexItemFactory) { |
| ImmutableSet.Builder<DexMethod> result = ImmutableSet.builder(); |
| Map<DexProto, DexProto> cache = new HashMap<>(); |
| for (DexMethod signature : mergedMethods) { |
| DexType newHolder = mergedClasses.getOrDefault(signature.holder, signature.holder); |
| DexProto newProto = |
| dexItemFactory.applyClassMappingToProto( |
| signature.proto, type -> mergedClasses.getOrDefault(type, type), cache); |
| if (signature.holder.equals(newHolder) && signature.proto.equals(newProto)) { |
| result.add(signature); |
| } else { |
| result.add(dexItemFactory.createMethod(newHolder, newProto, signature.name)); |
| } |
| } |
| return result.build(); |
| } |
| |
| public boolean hasMappingForSignatureInContext(DexType context, DexMethod signature) { |
| Map<DexMethod, DexMethod> virtualToDirectMethodMap = |
| contextualVirtualToDirectMethodMaps.get(context); |
| if (virtualToDirectMethodMap != null) { |
| return virtualToDirectMethodMap.containsKey(signature); |
| } |
| return false; |
| } |
| |
| public void markMethodAsMerged(DexMethod method) { |
| mergedMethodsBuilder.add(method); |
| } |
| |
| public void map(DexField from, DexField to) { |
| fieldMapBuilder.put(from, to); |
| } |
| |
| public void map(DexMethod from, DexMethod to) { |
| methodMapBuilder.put(from, to); |
| } |
| |
| public void mapVirtualMethodToDirectInType(DexMethod from, DexMethod to, DexType type) { |
| Map<DexMethod, DexMethod> virtualToDirectMethodMap = |
| contextualVirtualToDirectMethodMaps.computeIfAbsent(type, key -> new HashMap<>()); |
| virtualToDirectMethodMap.put(from, to); |
| } |
| |
| public void merge(VerticalClassMergerGraphLense.Builder builder) { |
| fieldMapBuilder.putAll(builder.fieldMapBuilder.build()); |
| methodMapBuilder.putAll(builder.methodMapBuilder.build()); |
| mergedMethodsBuilder.addAll(builder.mergedMethodsBuilder.build()); |
| for (DexType context : builder.contextualVirtualToDirectMethodMaps.keySet()) { |
| Map<DexMethod, DexMethod> current = contextualVirtualToDirectMethodMaps.get(context); |
| Map<DexMethod, DexMethod> other = builder.contextualVirtualToDirectMethodMaps.get(context); |
| if (current != null) { |
| current.putAll(other); |
| } else { |
| contextualVirtualToDirectMethodMaps.put(context, other); |
| } |
| } |
| } |
| } |
| } |