| // 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.utils; |
| |
| import static com.android.tools.r8.graph.DexLibraryClass.asLibraryClassOrNull; |
| |
| import com.android.tools.r8.androidapi.AndroidApiLevelCompute; |
| import com.android.tools.r8.androidapi.ComputedApiLevel; |
| import com.android.tools.r8.graph.AppInfoWithClassHierarchy; |
| import com.android.tools.r8.graph.AppView; |
| import com.android.tools.r8.graph.DexClass; |
| import com.android.tools.r8.graph.DexEncodedMethod; |
| 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.DexProgramClass; |
| import com.android.tools.r8.graph.DexType; |
| import com.android.tools.r8.graph.LibraryClass; |
| import com.android.tools.r8.graph.LibraryDefinition; |
| import com.android.tools.r8.graph.LibraryMethod; |
| import com.android.tools.r8.graph.ProgramMethod; |
| import com.android.tools.r8.ir.optimize.inliner.NopWhyAreYouNotInliningReporter; |
| import com.android.tools.r8.ir.optimize.inliner.WhyAreYouNotInliningReporter; |
| import com.google.common.collect.Sets; |
| import java.util.Collections; |
| import java.util.Set; |
| |
| public class AndroidApiLevelUtils { |
| |
| public static boolean isApiSafeForInlining( |
| ProgramMethod caller, ProgramMethod inlinee, InternalOptions options) { |
| return isApiSafeForInlining( |
| caller, inlinee, options, NopWhyAreYouNotInliningReporter.getInstance()); |
| } |
| |
| public static boolean isApiSafeForInlining( |
| ProgramMethod caller, |
| ProgramMethod inlinee, |
| InternalOptions options, |
| WhyAreYouNotInliningReporter whyAreYouNotInliningReporter) { |
| if (!options.apiModelingOptions().isApiCallerIdentificationEnabled()) { |
| return true; |
| } |
| if (caller.getHolderType() == inlinee.getHolderType()) { |
| return true; |
| } |
| ComputedApiLevel callerApiLevelForCode = caller.getDefinition().getApiLevelForCode(); |
| if (callerApiLevelForCode.isUnknownApiLevel()) { |
| whyAreYouNotInliningReporter.reportCallerHasUnknownApiLevel(); |
| return false; |
| } |
| // For inlining we only measure if the code has invokes into the library. |
| ComputedApiLevel inlineeApiLevelForCode = inlinee.getDefinition().getApiLevelForCode(); |
| if (!caller |
| .getDefinition() |
| .getApiLevelForCode() |
| .isGreaterThanOrEqualTo(inlineeApiLevelForCode)) { |
| whyAreYouNotInliningReporter.reportInlineeHigherApiCall( |
| callerApiLevelForCode, inlineeApiLevelForCode); |
| return false; |
| } |
| return true; |
| } |
| |
| public static ComputedApiLevel getApiReferenceLevelForMerging( |
| AppView<?> appView, AndroidApiLevelCompute apiLevelCompute, DexProgramClass clazz) { |
| // The api level of a class is the max level of it's members, super class and interfaces. |
| return getMembersApiReferenceLevelForMerging( |
| clazz, |
| apiLevelCompute.computeApiLevelForDefinition( |
| clazz.allImmediateSupertypes(), apiLevelCompute.getPlatformApiLevelOrUnknown(appView))); |
| } |
| |
| private static ComputedApiLevel getMembersApiReferenceLevelForMerging( |
| DexProgramClass clazz, ComputedApiLevel memberLevel) { |
| // Based on b/138781768#comment57 there is almost no penalty for having an unknown reference |
| // as long as we are not invoking or accessing a field on it. Therefore we can disregard static |
| // types of fields and only consider method code api levels. |
| for (DexEncodedMethod method : clazz.methods()) { |
| if (method.hasCode()) { |
| memberLevel = memberLevel.max(method.getApiLevelForCode()); |
| } |
| if (memberLevel.isUnknownApiLevel()) { |
| return memberLevel; |
| } |
| } |
| return memberLevel; |
| } |
| |
| public static boolean isApiSafeForMemberRebinding( |
| LibraryMethod method, |
| DexMethod original, |
| AndroidApiLevelCompute androidApiLevelCompute, |
| InternalOptions options) { |
| // If we are not using the api database and we have the platform build, then we assume we are |
| // running with boot class path as min api and all definitions are accessible at runtime. |
| if (!androidApiLevelCompute.isEnabled()) { |
| assert !options.apiModelingOptions().enableLibraryApiModeling; |
| return options.isAndroidPlatformBuildOrMinApiPlatform(); |
| } |
| assert options.apiModelingOptions().enableLibraryApiModeling; |
| ComputedApiLevel apiLevel = |
| androidApiLevelCompute.computeApiLevelForLibraryReference( |
| method.getReference(), ComputedApiLevel.unknown()); |
| if (apiLevel.isUnknownApiLevel()) { |
| return false; |
| } |
| ComputedApiLevel apiLevelOfOriginal = |
| androidApiLevelCompute.computeApiLevelForLibraryReference( |
| original, ComputedApiLevel.unknown()); |
| if (apiLevelOfOriginal.isUnknownApiLevel()) { |
| return false; |
| } |
| return apiLevelOfOriginal.max(apiLevel).isLessThanOrEqualTo(options.getMinApiLevel()).isTrue(); |
| } |
| |
| public static boolean isApiSafeForReference(LibraryDefinition definition, AppView<?> appView) { |
| if (appView.options().isAndroidPlatformBuildOrMinApiPlatform()) { |
| assert definition != null; |
| return true; |
| } |
| return isApiSafeForReference( |
| definition, appView.apiLevelCompute(), appView.options(), appView.dexItemFactory()); |
| } |
| |
| private static boolean isApiSafeForReference( |
| LibraryDefinition definition, |
| AndroidApiLevelCompute androidApiLevelCompute, |
| InternalOptions options, |
| DexItemFactory factory) { |
| if (!options.apiModelingOptions().enableApiCallerIdentification) { |
| return factory.libraryTypesAssumedToBePresent.contains(definition.getContextType()); |
| } |
| ComputedApiLevel apiLevel = |
| androidApiLevelCompute.computeApiLevelForLibraryReference( |
| definition.getReference(), ComputedApiLevel.unknown()); |
| return apiLevel.isLessThanOrEqualTo(options.getMinApiLevel()).isTrue(); |
| } |
| |
| private static boolean isApiSafeForReference( |
| LibraryDefinition newDefinition, LibraryDefinition oldDefinition, AppView<?> appView) { |
| assert appView.options().apiModelingOptions().enableApiCallerIdentification; |
| assert !isApiSafeForReference(newDefinition, appView) |
| : "Clients should first check if the definition is present on all apis since the min api"; |
| AndroidApiLevelCompute androidApiLevelCompute = appView.apiLevelCompute(); |
| ComputedApiLevel apiLevel = |
| androidApiLevelCompute.computeApiLevelForLibraryReference( |
| newDefinition.getReference(), ComputedApiLevel.unknown()); |
| if (apiLevel.isUnknownApiLevel()) { |
| return false; |
| } |
| ComputedApiLevel apiLevelOfOriginal = |
| androidApiLevelCompute.computeApiLevelForLibraryReference( |
| oldDefinition.getReference(), ComputedApiLevel.unknown()); |
| return apiLevel.isLessThanOrEqualTo(apiLevelOfOriginal).isTrue(); |
| } |
| |
| public static boolean isApiSafeForTypeStrengthening( |
| DexType newType, DexType oldType, AppView<? extends AppInfoWithClassHierarchy> appView) { |
| // Type strengthening only applies to reference types. |
| assert newType.isReferenceType(); |
| assert oldType.isReferenceType(); |
| assert newType != oldType; |
| DexItemFactory dexItemFactory = appView.dexItemFactory(); |
| DexType newBaseType = newType.toBaseType(dexItemFactory); |
| if (newBaseType.isPrimitiveType()) { |
| // Array of primitives is available on all api levels. |
| return true; |
| } |
| assert newBaseType.isClassType(); |
| DexClass newBaseClass = appView.definitionFor(newBaseType); |
| if (newBaseClass == null) { |
| // This could be a library class that is only available on newer api levels. |
| return false; |
| } |
| if (!newBaseClass.isLibraryClass()) { |
| // Program and classpath classes are not api level dependent. |
| return true; |
| } |
| if (!appView.options().apiModelingOptions().isApiCallerIdentificationEnabled()) { |
| // Conservatively bail out if we don't have api modeling. |
| return appView.options().isAndroidPlatformBuildOrMinApiPlatform(); |
| } |
| LibraryClass newBaseLibraryClass = newBaseClass.asLibraryClass(); |
| if (isApiSafeForReference(newBaseLibraryClass, appView)) { |
| // Library class is present on all api levels since min api. |
| return true; |
| } |
| // Check if the new library class is present since the api level of the old type. |
| DexType oldBaseType = oldType.toBaseType(dexItemFactory); |
| assert oldBaseType.isClassType(); |
| LibraryClass oldBaseLibraryClass = asLibraryClassOrNull(appView.definitionFor(oldBaseType)); |
| return oldBaseLibraryClass != null |
| && isApiSafeForReference(newBaseLibraryClass, oldBaseLibraryClass, appView); |
| } |
| |
| public static Pair<DexClass, ComputedApiLevel> findAndComputeApiLevelForLibraryDefinition( |
| AppView<?> appView, |
| AppInfoWithClassHierarchy appInfo, |
| DexClass holder, |
| DexMember<?, ?> reference) { |
| AndroidApiLevelCompute apiLevelCompute = appView.apiLevelCompute(); |
| if (holder.isLibraryClass()) { |
| return Pair.create( |
| holder, |
| apiLevelCompute.computeApiLevelForLibraryReference( |
| reference, ComputedApiLevel.unknown())); |
| } |
| // The API database do not allow for resolving into it (since that is not stable), and it is |
| // therefore designed in a way where all members of classes can be queried on any sub-type with |
| // the api level for where it is reachable. It is therefore sufficient for us, to figure out if |
| // an instruction is a library call, to either find a program definition or to find the library |
| // frontier. |
| // Scan through the type hierarchy to find the first library class or program definition. |
| DexClass firstClassWithReferenceOrLibraryClass = |
| firstLibraryClassOrProgramClassWithDefinition(appInfo, holder, reference); |
| if (firstClassWithReferenceOrLibraryClass == null) { |
| return Pair.create(null, ComputedApiLevel.unknown()); |
| } |
| if (!firstClassWithReferenceOrLibraryClass.isLibraryClass()) { |
| return Pair.create(firstClassWithReferenceOrLibraryClass, appView.computedMinApiLevel()); |
| } |
| ComputedApiLevel apiLevel = |
| apiLevelCompute.computeApiLevelForLibraryReference( |
| reference.withHolder( |
| firstClassWithReferenceOrLibraryClass.getType(), appView.dexItemFactory()), |
| ComputedApiLevel.unknown()); |
| if (apiLevel.isKnownApiLevel()) { |
| return Pair.create(firstClassWithReferenceOrLibraryClass, apiLevel); |
| } |
| // We were unable to find a definition in the class hierarchy, check all interfaces for a |
| // definition or the library interfaces for the first interface definition. |
| Set<DexClass> firstLibraryInterfaces = |
| findAllFirstLibraryInterfacesOrProgramClassWithDefinition(appInfo, holder, reference); |
| if (firstLibraryInterfaces.size() == 1) { |
| DexClass firstClass = firstLibraryInterfaces.iterator().next(); |
| if (!firstClass.isLibraryClass()) { |
| return Pair.create(firstClass, appView.computedMinApiLevel()); |
| } |
| } |
| DexClass foundClass = null; |
| ComputedApiLevel minApiLevel = ComputedApiLevel.unknown(); |
| for (DexClass libraryInterface : firstLibraryInterfaces) { |
| assert libraryInterface.isLibraryClass(); |
| ComputedApiLevel libraryIfaceApiLevel = |
| apiLevelCompute.computeApiLevelForLibraryReference( |
| reference.withHolder( |
| firstClassWithReferenceOrLibraryClass.getType(), appView.dexItemFactory()), |
| ComputedApiLevel.unknown()); |
| if (minApiLevel.isGreaterThan(libraryIfaceApiLevel)) { |
| minApiLevel = libraryIfaceApiLevel; |
| foundClass = libraryInterface; |
| } |
| } |
| return Pair.create(foundClass, minApiLevel); |
| } |
| |
| private static DexClass firstLibraryClassOrProgramClassWithDefinition( |
| AppInfoWithClassHierarchy appInfo, DexClass originalClass, DexMember<?, ?> reference) { |
| if (originalClass.isLibraryClass()) { |
| return originalClass; |
| } |
| WorkList<DexClass> workList = WorkList.newIdentityWorkList(originalClass); |
| while (workList.hasNext()) { |
| DexClass clazz = workList.next(); |
| if (clazz.isLibraryClass()) { |
| return clazz; |
| } else if (clazz.lookupMember(reference) != null) { |
| return clazz; |
| } else if (clazz.getSuperType() != null) { |
| appInfo |
| .contextIndependentDefinitionForWithResolutionResult(clazz.getSuperType()) |
| .forEachClassResolutionResult(workList::addIfNotSeen); |
| } |
| } |
| return null; |
| } |
| |
| private static Set<DexClass> findAllFirstLibraryInterfacesOrProgramClassWithDefinition( |
| AppInfoWithClassHierarchy appInfo, DexClass originalClass, DexMember<?, ?> reference) { |
| Set<DexClass> interfaces = Sets.newLinkedHashSet(); |
| WorkList<DexClass> workList = WorkList.newIdentityWorkList(originalClass); |
| while (workList.hasNext()) { |
| DexClass clazz = workList.next(); |
| if (clazz.isLibraryClass()) { |
| if (clazz.isInterface()) { |
| interfaces.add(clazz); |
| } |
| } else if (clazz.lookupMember(reference) != null) { |
| return Collections.singleton(clazz); |
| } else { |
| clazz.forEachImmediateSupertype( |
| superType -> |
| appInfo |
| .contextIndependentDefinitionForWithResolutionResult(superType) |
| .forEachClassResolutionResult(workList::addIfNotSeen)); |
| } |
| } |
| return interfaces; |
| } |
| } |
