com.android.dx.dex.file.MethodHandleItem Maven / Gradle / Ivy
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.dx.dex.file;
import com.android.dx.rop.cst.Constant;
import com.android.dx.rop.cst.CstBaseMethodRef;
import com.android.dx.rop.cst.CstFieldRef;
import com.android.dx.rop.cst.CstInterfaceMethodRef;
import com.android.dx.rop.cst.CstMethodHandle;
import com.android.dx.util.AnnotatedOutput;
import com.android.dx.util.Hex;
/**
* Representation of a method handle in a DEX file.
*/
public final class MethodHandleItem extends IndexedItem {
/** The item size when placed in a DEX file. */
private final int ITEM_SIZE = 8;
/** {@code non-null;} The method handle represented by this item. */
private final CstMethodHandle methodHandle;
/**
* Constructs an instance.
*
* @param methodHandle {@code non-null;} The method handle to represent in the DEX file.
*/
public MethodHandleItem(CstMethodHandle methodHandle) {
this.methodHandle = methodHandle;
}
/** {@inheritDoc} */
@Override
public ItemType itemType() {
return ItemType.TYPE_METHOD_HANDLE_ITEM;
}
/** {@inheritDoc} */
@Override
public int writeSize() {
return ITEM_SIZE;
}
/** {@inheritDoc} */
@Override
public void addContents(DexFile file) {
MethodHandlesSection methodHandles = file.getMethodHandles();
methodHandles.intern(methodHandle);
}
/** {@inheritDoc} */
@Override
public void writeTo(DexFile file, AnnotatedOutput out) {
int targetIndex = getTargetIndex(file);
int mhType = methodHandle.getMethodHandleType();
if (out.annotates()) {
out.annotate(0, indexString() + ' ' + methodHandle.toString());
String typeComment = " // " + CstMethodHandle.getMethodHandleTypeName(mhType);
out.annotate(2, "type: " + Hex.u2(mhType) + typeComment);
out.annotate(2, "reserved: " + Hex.u2(0));
String targetComment = " // " + methodHandle.getRef().toString();
if (methodHandle.isAccessor()) {
out.annotate(2, "fieldId: " + Hex.u2(targetIndex) + targetComment);
} else {
out.annotate(2, "methodId: " + Hex.u2(targetIndex) + targetComment);
}
out.annotate(2, "reserved: " + Hex.u2(0));
}
out.writeShort(mhType);
out.writeShort(0);
out.writeShort(getTargetIndex(file));
out.writeShort(0);
}
private int getTargetIndex(DexFile file) {
Constant ref = methodHandle.getRef();
if (methodHandle.isAccessor()) {
FieldIdsSection fieldIds = file.getFieldIds();
return fieldIds.indexOf((CstFieldRef) ref);
} else if (methodHandle.isInvocation()) {
if (ref instanceof CstInterfaceMethodRef) {
ref = ((CstInterfaceMethodRef)ref).toMethodRef();
}
MethodIdsSection methodIds = file.getMethodIds();
return methodIds.indexOf((CstBaseMethodRef) ref);
} else {
throw new IllegalStateException("Unhandled invocation type");
}
}
}