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package cuchaz.enigma.translation.mapping;
import com.google.common.collect.Sets;
import cuchaz.enigma.analysis.IndexTreeBuilder;
import cuchaz.enigma.analysis.MethodImplementationsTreeNode;
import cuchaz.enigma.analysis.MethodInheritanceTreeNode;
import cuchaz.enigma.analysis.index.BridgeMethodIndex;
import cuchaz.enigma.analysis.index.EntryIndex;
import cuchaz.enigma.analysis.index.InheritanceIndex;
import cuchaz.enigma.analysis.index.JarIndex;
import cuchaz.enigma.translation.VoidTranslator;
import cuchaz.enigma.translation.representation.AccessFlags;
import cuchaz.enigma.translation.representation.entry.ClassEntry;
import cuchaz.enigma.translation.representation.entry.Entry;
import cuchaz.enigma.translation.representation.entry.MethodEntry;
import javax.annotation.Nullable;
import java.util.*;
import java.util.stream.Collectors;
public class IndexEntryResolver implements EntryResolver {
private final EntryIndex entryIndex;
private final InheritanceIndex inheritanceIndex;
private final BridgeMethodIndex bridgeMethodIndex;
private final IndexTreeBuilder treeBuilder;
public IndexEntryResolver(JarIndex index) {
this.entryIndex = index.getEntryIndex();
this.inheritanceIndex = index.getInheritanceIndex();
this.bridgeMethodIndex = index.getBridgeMethodIndex();
this.treeBuilder = new IndexTreeBuilder(index);
}
@Override
@SuppressWarnings("unchecked")
public <E extends Entry<?>> Collection<E> resolveEntry(E entry, ResolutionStrategy strategy) {
if (entry == null) {
return Collections.emptySet();
}
Entry<ClassEntry> classChild = getClassChild(entry);
if (classChild != null && !(classChild instanceof ClassEntry)) {
AccessFlags access = entryIndex.getEntryAccess(classChild);
// If we're looking for the closest and this entry exists, we're done looking
if (strategy == ResolutionStrategy.RESOLVE_CLOSEST && access != null) {
return Collections.singleton(entry);
}
if (access == null || !access.isPrivate()) {
Collection<Entry<ClassEntry>> resolvedChildren = resolveChildEntry(classChild, strategy);
if (!resolvedChildren.isEmpty()) {
return resolvedChildren.stream()
.map(resolvedChild -> (E) entry.replaceAncestor(classChild, resolvedChild))
.collect(Collectors.toList());
}
}
}
return Collections.singleton(entry);
}
@Nullable
private Entry<ClassEntry> getClassChild(Entry<?> entry) {
if (entry instanceof ClassEntry) {
return null;
}
// get the entry in the hierarchy that is the child of a class
List<Entry<?>> ancestry = entry.getAncestry();
for (int i = ancestry.size() - 1; i > 0; i--) {
Entry<?> child = ancestry.get(i);
Entry<ClassEntry> cast = child.castParent(ClassEntry.class);
if (cast != null && !(cast instanceof ClassEntry)) {
// we found the entry which is a child of a class, we are now able to resolve the owner of this entry
return cast;
}
}
return null;
}
private Set<Entry<ClassEntry>> resolveChildEntry(Entry<ClassEntry> entry, ResolutionStrategy strategy) {
ClassEntry ownerClass = entry.getParent();
if (entry instanceof MethodEntry) {
MethodEntry bridgeMethod = bridgeMethodIndex.getBridgeFromSpecialized((MethodEntry) entry);
if (bridgeMethod != null && ownerClass.equals(bridgeMethod.getParent())) {
Set<Entry<ClassEntry>> resolvedBridge = resolveChildEntry(bridgeMethod, strategy);
if (!resolvedBridge.isEmpty()) {
return resolvedBridge;
} else {
return Collections.singleton(bridgeMethod);
}
}
}
Set<Entry<ClassEntry>> resolvedEntries = new HashSet<>();
for (ClassEntry parentClass : inheritanceIndex.getParents(ownerClass)) {
Entry<ClassEntry> parentEntry = entry.withParent(parentClass);
if (strategy == ResolutionStrategy.RESOLVE_ROOT) {
resolvedEntries.addAll(resolveRoot(parentEntry, strategy));
} else {
resolvedEntries.addAll(resolveClosest(parentEntry, strategy));
}
}
return resolvedEntries;
}
private Collection<Entry<ClassEntry>> resolveRoot(Entry<ClassEntry> entry, ResolutionStrategy strategy) {
// When resolving root, we want to first look for the lowest entry before returning ourselves
Set<Entry<ClassEntry>> parentResolution = resolveChildEntry(entry, strategy);
if (parentResolution.isEmpty()) {
AccessFlags parentAccess = entryIndex.getEntryAccess(entry);
if (parentAccess != null && !parentAccess.isPrivate()) {
return Collections.singleton(entry);
}
}
return parentResolution;
}
private Collection<Entry<ClassEntry>> resolveClosest(Entry<ClassEntry> entry, ResolutionStrategy strategy) {
// When resolving closest, we want to first check if we exist before looking further down
AccessFlags parentAccess = entryIndex.getEntryAccess(entry);
if (parentAccess != null && !parentAccess.isPrivate()) {
return Collections.singleton(entry);
} else {
return resolveChildEntry(entry, strategy);
}
}
@Override
public Set<Entry<?>> resolveEquivalentEntries(Entry<?> entry) {
MethodEntry relevantMethod = entry.findAncestor(MethodEntry.class);
if (relevantMethod == null || !entryIndex.hasMethod(relevantMethod)) {
return Collections.singleton(entry);
}
Set<MethodEntry> equivalentMethods = resolveEquivalentMethods(relevantMethod);
Set<Entry<?>> equivalentEntries = new HashSet<>(equivalentMethods.size());
for (MethodEntry equivalentMethod : equivalentMethods) {
Entry<?> equivalentEntry = entry.replaceAncestor(relevantMethod, equivalentMethod);
equivalentEntries.add(equivalentEntry);
}
return equivalentEntries;
}
@Override
public Set<MethodEntry> resolveEquivalentMethods(MethodEntry methodEntry) {
AccessFlags access = entryIndex.getMethodAccess(methodEntry);
if (access == null) {
throw new IllegalArgumentException("Could not find method " + methodEntry);
}
if (!canInherit(methodEntry, access)) {
return Collections.singleton(methodEntry);
}
Set<MethodEntry> methodEntries = Sets.newHashSet();
resolveEquivalentMethods(methodEntries, treeBuilder.buildMethodInheritance(VoidTranslator.INSTANCE, methodEntry));
return methodEntries;
}
private void resolveEquivalentMethods(Set<MethodEntry> methodEntries, MethodInheritanceTreeNode node) {
MethodEntry methodEntry = node.getMethodEntry();
if (methodEntries.contains(methodEntry)) {
return;
}
AccessFlags flags = entryIndex.getMethodAccess(methodEntry);
if (flags != null && canInherit(methodEntry, flags)) {
// collect the entry
methodEntries.add(methodEntry);
}
// look at bridge methods!
MethodEntry bridgedMethod = bridgeMethodIndex.getBridgeFromSpecialized(methodEntry);
while (bridgedMethod != null) {
methodEntries.addAll(resolveEquivalentMethods(bridgedMethod));
bridgedMethod = bridgeMethodIndex.getBridgeFromSpecialized(bridgedMethod);
}
// look at interface methods too
for (MethodImplementationsTreeNode implementationsNode : treeBuilder.buildMethodImplementations(VoidTranslator.INSTANCE, methodEntry)) {
resolveEquivalentMethods(methodEntries, implementationsNode);
}
// recurse
for (int i = 0; i < node.getChildCount(); i++) {
resolveEquivalentMethods(methodEntries, (MethodInheritanceTreeNode) node.getChildAt(i));
}
}
private void resolveEquivalentMethods(Set<MethodEntry> methodEntries, MethodImplementationsTreeNode node) {
MethodEntry methodEntry = node.getMethodEntry();
AccessFlags flags = entryIndex.getMethodAccess(methodEntry);
if (flags != null && !flags.isPrivate() && !flags.isStatic()) {
// collect the entry
methodEntries.add(methodEntry);
}
// look at bridge methods!
MethodEntry bridgedMethod = bridgeMethodIndex.getBridgeFromSpecialized(methodEntry);
while (bridgedMethod != null) {
methodEntries.addAll(resolveEquivalentMethods(bridgedMethod));
bridgedMethod = bridgeMethodIndex.getBridgeFromSpecialized(bridgedMethod);
}
// recurse
for (int i = 0; i < node.getChildCount(); i++) {
resolveEquivalentMethods(methodEntries, (MethodImplementationsTreeNode) node.getChildAt(i));
}
}
private boolean canInherit(MethodEntry entry, AccessFlags access) {
return !entry.isConstructor() && !access.isPrivate() && !access.isStatic() && !access.isFinal();
}
}
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