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// Copyright (c) 2017, 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.naming;
import com.android.tools.r8.graph.CachedHashValueDexItem;
import com.android.tools.r8.graph.DexItemFactory;
import com.android.tools.r8.graph.DexString;
import com.android.tools.r8.utils.StringUtils;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
class NamingState<T extends CachedHashValueDexItem> {
private final NamingState<T> parent;
private final Map<T, InternalState> usedNames = new IdentityHashMap<>();
private final DexItemFactory itemFactory;
private final ImmutableList<String> dictionary;
static <T extends CachedHashValueDexItem> NamingState<T> createRoot(
DexItemFactory itemFactory, ImmutableList<String> dictionary) {
return new NamingState<>(null, itemFactory, dictionary);
}
private NamingState(
NamingState<T> parent,
DexItemFactory itemFactory,
ImmutableList<String> dictionary) {
this.parent = parent;
this.itemFactory = itemFactory;
this.dictionary = dictionary;
}
public NamingState<T> createChild() {
return new NamingState<>(this, itemFactory, dictionary);
}
private InternalState findInternalStateFor(T proto) {
InternalState result = usedNames.get(proto);
if (result == null && parent != null) {
result = parent.findInternalStateFor(proto);
}
return result;
}
private InternalState getOrCreateInternalStateFor(T proto) {
// TODO(herhut): Maybe allocate these sparsely and search via state chain.
InternalState result = usedNames.get(proto);
if (result == null) {
if (parent != null) {
InternalState parentState = parent.getOrCreateInternalStateFor(proto);
result = parentState.createChild();
} else {
result = new InternalState(itemFactory, null, dictionary);
}
usedNames.put(proto, result);
}
return result;
}
public DexString getAssignedNameFor(DexString name, T proto) {
InternalState state = findInternalStateFor(proto);
if (state == null) {
return null;
}
return state.getAssignedNameFor(name);
}
public DexString assignNewNameFor(DexString original, T proto, boolean markAsUsed) {
DexString result = getAssignedNameFor(original, proto);
if (result == null) {
InternalState state = getOrCreateInternalStateFor(proto);
result = state.getNameFor(original, markAsUsed);
}
return result;
}
public void reserveName(DexString name, T proto) {
InternalState state = getOrCreateInternalStateFor(proto);
state.reserveName(name);
}
public boolean isReserved(DexString name, T proto) {
InternalState state = findInternalStateFor(proto);
if (state == null) {
return false;
}
return state.isReserved(name);
}
public boolean isAvailable(DexString original, T proto, DexString candidate) {
InternalState state = findInternalStateFor(proto);
if (state == null) {
return true;
}
assert state.getAssignedNameFor(original) != candidate;
return state.isAvailable(candidate);
}
public void addRenaming(DexString original, T proto, DexString newName) {
InternalState state = getOrCreateInternalStateFor(proto);
state.addRenaming(original, newName);
}
private static class InternalState {
private static int INITIAL_NAME_COUNT = 1;
private final static char[] EMPTY_CHAR_ARRARY = new char[0];
protected final DexItemFactory itemFactory;
private final InternalState parentInternalState;
private Set<DexString> reservedNames = null;
private Map<DexString, DexString> renamings = null;
private int nameCount;
private final Iterator<String> dictionaryIterator;
private InternalState(DexItemFactory itemFactory, InternalState parentInternalState,
Iterator<String> dictionaryIterator) {
this.itemFactory = itemFactory;
this.parentInternalState = parentInternalState;
this.nameCount =
parentInternalState == null ? INITIAL_NAME_COUNT : parentInternalState.nameCount;
this.dictionaryIterator = dictionaryIterator;
}
private InternalState(DexItemFactory itemFactory, InternalState parentInternalState,
List<String> dictionary) {
this(itemFactory, parentInternalState, dictionary.iterator());
}
private boolean isReserved(DexString name) {
return (reservedNames != null && reservedNames.contains(name))
|| (parentInternalState != null && parentInternalState.isReserved(name));
}
private boolean isAvailable(DexString name) {
return !(renamings != null && renamings.containsValue(name))
&& !(reservedNames != null && reservedNames.contains(name))
&& (parentInternalState == null || parentInternalState.isAvailable(name));
}
public InternalState createChild() {
return new InternalState(itemFactory, this, dictionaryIterator);
}
public void reserveName(DexString name) {
if (reservedNames == null) {
reservedNames = Sets.newIdentityHashSet();
}
reservedNames.add(name);
}
public DexString getAssignedNameFor(DexString original) {
DexString result = renamings == null ? null : renamings.get(original);
if (result == null && parentInternalState != null) {
result = parentInternalState.getAssignedNameFor(original);
}
return result;
}
public DexString getNameFor(DexString original, boolean markAsUsed) {
DexString name = getAssignedNameFor(original);
if (name != null) {
return name;
}
do {
name = itemFactory.createString(nextSuggestedName());
} while (!isAvailable(name));
if (markAsUsed) {
addRenaming(original, name);
}
return name;
}
public void addRenaming(DexString original, DexString newName) {
if (renamings == null) {
renamings = HashBiMap.create();
}
renamings.put(original, newName);
}
protected String nextSuggestedName() {
if (dictionaryIterator.hasNext()) {
return dictionaryIterator.next();
} else {
return StringUtils.numberToIdentifier(EMPTY_CHAR_ARRARY, nameCount++, false);
}
}
}
}
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