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// Copyright (c) 2016, 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.graph;
import com.android.tools.r8.dex.Constants;
import com.android.tools.r8.errors.CompilationError;
import it.unimi.dsi.fastutil.objects.Reference2IntLinkedOpenHashMap;
import it.unimi.dsi.fastutil.objects.Reference2IntMap;
import it.unimi.dsi.fastutil.objects.Reference2IntMap.Entry;
import it.unimi.dsi.fastutil.objects.Reference2IntOpenHashMap;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import java.util.stream.Collectors;
public class ObjectToOffsetMapping {
private final static int NOT_FOUND = -1;
private final static int NOT_SET = -2;
private final DexProgramClass[] classes;
private final Reference2IntMap<DexProto> protos;
private final Reference2IntMap<DexType> types;
private final Reference2IntMap<DexMethod> methods;
private final Reference2IntMap<DexField> fields;
private final Reference2IntMap<DexString> strings;
private final Reference2IntMap<DexCallSite> callSites;
private final Reference2IntMap<DexMethodHandle> methodHandles;
private DexString firstJumboString;
public ObjectToOffsetMapping(
DexApplication application,
Collection<DexProgramClass> classes,
Collection<DexProto> protos,
Collection<DexType> types,
Collection<DexMethod> methods,
Collection<DexField> fields,
Collection<DexString> strings,
Collection<DexCallSite> callSites,
Collection<DexMethodHandle> methodHandles) {
assert application != null;
assert classes != null;
assert protos != null;
assert types != null;
assert methods != null;
assert fields != null;
assert strings != null;
assert callSites != null;
assert methodHandles != null;
this.classes = sortClasses(application, classes);
this.protos = createMap(protos, this::failOnOverflow);
this.types = createMap(types, this::failOnOverflow);
this.methods = createMap(methods, this::failOnOverflow);
this.fields = createMap(fields, this::failOnOverflow);
this.strings = createMap(strings, this::setFirstJumboString);
this.callSites = createMap(callSites, this::failOnOverflow);
this.methodHandles = createMap(methodHandles, this::failOnOverflow);
}
private void setFirstJumboString(DexString string) {
assert firstJumboString == null;
firstJumboString = string;
}
private void failOnOverflow(DexItem item) {
throw new CompilationError("Index overflow for " + item.getClass());
}
private <T extends IndexedDexItem> Reference2IntMap<T> createMap(Collection<T> items,
Consumer<T> onUInt16Overflow) {
if (items.isEmpty()) {
return null;
}
Reference2IntMap<T> map = new Reference2IntLinkedOpenHashMap<>(items.size());
map.defaultReturnValue(NOT_FOUND);
Collection<T> sorted = items.stream().sorted().collect(Collectors.toList());
int index = 0;
for (T item : sorted) {
if (index == Constants.U16BIT_MAX + 1) {
onUInt16Overflow.accept(item);
}
map.put(item, index++);
}
return map;
}
/**
* Here, 'depth' of a program class is an integer one bigger then the maximum depth of its
* superclass and implemented interfaces. The depth of classes without any or without known
* superclasses and interfaces is 1.
*/
private static class ProgramClassDepthsMemoized {
private final static int UNKNOWN_DEPTH = -1;
private final DexApplication application;
private final Reference2IntMap<DexProgramClass> depthOfClasses = new Reference2IntOpenHashMap<>();
ProgramClassDepthsMemoized(DexApplication application) {
this.application = application;
depthOfClasses.defaultReturnValue(UNKNOWN_DEPTH);
}
int getDepth(DexProgramClass programClass) {
int depth = depthOfClasses.getInt(programClass);
// TODO(b/65536002): use "computeIntIfAbsent" after upgrading to fastutils 8.x.
if (depth == UNKNOWN_DEPTH) {
// Emulating the algorithm of com.android.dx.merge.SortableType.tryAssignDepth().
DexType superType = programClass.superType;
int maxDepth;
if (superType == null) {
maxDepth = 0;
} else {
maxDepth = 1;
DexProgramClass superClass = application.programDefinitionFor(superType);
if (superClass != null) {
maxDepth = getDepth(superClass);
}
}
for (DexType inf : programClass.interfaces.values) {
DexProgramClass infClass = application.programDefinitionFor(inf);
maxDepth = Math.max(maxDepth, infClass == null ? 1 : getDepth(infClass));
}
depth = maxDepth + 1;
depthOfClasses.put(programClass, depth);
}
return depth;
}
}
private static DexProgramClass[] sortClasses(DexApplication application,
Collection<DexProgramClass> classes) {
// Collect classes in subtyping order, based on a sorted list of classes to start with.
ProgramClassDepthsMemoized classDepths = new ProgramClassDepthsMemoized(application);
List<DexProgramClass> sortedClasses =
classes
.stream()
.sorted(
(x, y) -> {
int dx = classDepths.getDepth(x);
int dy = classDepths.getDepth(y);
return dx != dy ? dx - dy : x.type.compareTo(y.type);
})
.collect(Collectors.toList());
return sortedClasses.toArray(new DexProgramClass[sortedClasses.size()]);
}
private static <T> Collection<T> keysOrEmpty(Map<T, ?> map) {
return map == null ? Collections.emptyList() : map.keySet();
}
public Collection<DexMethod> getMethods() {
return keysOrEmpty(methods);
}
public DexProgramClass[] getClasses() {
return classes;
}
public Collection<DexType> getTypes() {
return keysOrEmpty(types);
}
public Collection<DexProto> getProtos() {
return keysOrEmpty(protos);
}
public Collection<DexField> getFields() {
return keysOrEmpty(fields);
}
public Collection<DexString> getStrings() {
return keysOrEmpty(strings);
}
public Collection<DexCallSite> getCallSites() {
return keysOrEmpty(callSites);
}
public Collection<DexMethodHandle> getMethodHandles() {
return keysOrEmpty(methodHandles);
}
public boolean hasJumboStrings() {
return firstJumboString != null;
}
public DexString getFirstJumboString() {
return firstJumboString;
}
public DexString getFirstString() {
for (Entry<DexString> dexStringEntry : strings.reference2IntEntrySet()) {
if (dexStringEntry.getIntValue() == 0) {
return dexStringEntry.getKey();
}
}
return null;
}
private <T extends IndexedDexItem> int getOffsetFor(T item, Reference2IntMap<T> map) {
int index = map.getInt(item);
assert index != NOT_SET : "Index was not set: " + item;
assert index != NOT_FOUND : "Missing dependency: " + item;
return index;
}
public int getOffsetFor(DexProto proto) {
return getOffsetFor(proto, protos);
}
public int getOffsetFor(DexField field) {
return getOffsetFor(field, fields);
}
public int getOffsetFor(DexMethod method) {
return getOffsetFor(method, methods);
}
public int getOffsetFor(DexString string) {
return getOffsetFor(string, strings);
}
public int getOffsetFor(DexType type) {
return getOffsetFor(type, types);
}
public int getOffsetFor(DexCallSite callSite) {
return getOffsetFor(callSite, callSites);
}
public int getOffsetFor(DexMethodHandle methodHandle) {
return getOffsetFor(methodHandle, methodHandles);
}
}