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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.Resource;
import com.android.tools.r8.dex.MixedSectionCollection;
import com.android.tools.r8.errors.CompilationError;
import com.android.tools.r8.errors.Unreachable;
import com.google.common.base.MoreObjects;
import java.util.function.Consumer;
public abstract class DexClass extends DexItem {
private static final DexEncodedMethod[] NO_METHODS = {};
private static final DexEncodedField[] NO_FIELDS = {};
public final Resource.Kind origin;
public final DexType type;
public final DexAccessFlags accessFlags;
public DexType superType;
public DexTypeList interfaces;
public final DexString sourceFile;
public DexEncodedField[] staticFields;
public DexEncodedField[] instanceFields;
public DexEncodedMethod[] directMethods;
public DexEncodedMethod[] virtualMethods;
public DexAnnotationSet annotations;
public DexClass(
DexString sourceFile, DexTypeList interfaces, DexAccessFlags accessFlags, DexType superType,
DexType type, DexEncodedField[] staticFields, DexEncodedField[] instanceFields,
DexEncodedMethod[] directMethods, DexEncodedMethod[] virtualMethods,
DexAnnotationSet annotations, Resource.Kind origin) {
this.origin = origin;
this.sourceFile = sourceFile;
this.interfaces = interfaces;
this.accessFlags = accessFlags;
this.superType = superType;
this.type = type;
this.staticFields = staticFields;
this.instanceFields = instanceFields;
this.directMethods = directMethods;
this.virtualMethods = virtualMethods;
this.annotations = annotations;
if (type == superType) {
throw new CompilationError("Class " + type.toString() + " cannot extend itself");
}
for (DexType interfaceType : interfaces.values) {
if (type == interfaceType) {
throw new CompilationError("Interface " + type.toString() + " cannot implement itself");
}
}
if (!type.descriptor.isValidClassDescriptor()) {
throw new CompilationError(
"Class descriptor '"
+ type.descriptor.toString()
+ "' cannot be represented in dex format.");
}
}
@Override
void collectMixedSectionItems(MixedSectionCollection mixedItems) {
throw new Unreachable();
}
public DexEncodedMethod[] directMethods() {
return MoreObjects.firstNonNull(directMethods, NO_METHODS);
}
public DexEncodedMethod[] virtualMethods() {
return MoreObjects.firstNonNull(virtualMethods, NO_METHODS);
}
public void forEachMethod(Consumer<DexEncodedMethod> consumer) {
for (DexEncodedMethod method : directMethods()) {
consumer.accept(method);
}
for (DexEncodedMethod method : virtualMethods()) {
consumer.accept(method);
}
}
public DexEncodedField[] staticFields() {
return MoreObjects.firstNonNull(staticFields, NO_FIELDS);
}
public DexEncodedField[] instanceFields() {
return MoreObjects.firstNonNull(instanceFields, NO_FIELDS);
}
/**
* Find direct method in this class matching method
*/
public DexEncodedMethod findDirectTarget(DexMethod method) {
return findTarget(directMethods(), method);
}
/**
* Find static field in this class matching field
*/
public DexEncodedField findStaticTarget(DexField field) {
return findTarget(staticFields(), field);
}
/**
* Find virtual method in this class matching method
*/
public DexEncodedMethod findVirtualTarget(DexMethod method) {
return findTarget(virtualMethods(), method);
}
/**
* Find instance field in this class matching field
*/
public DexEncodedField findInstanceTarget(DexField field) {
return findTarget(instanceFields(), field);
}
private <T extends DexItem, S extends Descriptor<T, S>> T findTarget(T[] items, S descriptor) {
for (T entry : items) {
if (descriptor.match(entry)) {
return entry;
}
}
return null;
}
// Tells whether this is an interface.
public boolean isInterface() {
return accessFlags.isInterface();
}
public abstract void addDependencies(MixedSectionCollection collector);
public boolean isProgramClass() {
return false;
}
public DexProgramClass asProgramClass() {
return null;
}
public boolean isClasspathClass() {
return false;
}
public DexClasspathClass asClasspathClass() {
return null;
}
public boolean isLibraryClass() {
return false;
}
public DexLibraryClass asLibraryClass() {
return null;
}
public DexEncodedMethod getClassInitializer() {
for (DexEncodedMethod method : directMethods()) {
if (method.accessFlags.isConstructor() && method.accessFlags.isStatic()) {
return method;
}
}
return null;
}
public Resource.Kind getOrigin() {
return this.origin;
}
public boolean hasClassInitializer() {
return getClassInitializer() != null;
}
public boolean hasNonTrivialClassInitializer() {
DexEncodedMethod clinit = getClassInitializer();
if (clinit == null || clinit.getCode() == null) {
return false;
}
if (clinit.getCode().isDexCode()) {
return !clinit.getCode().asDexCode().isEmptyVoidMethod();
}
// For non-dex code we don't try to check the code.
return true;
}
}
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