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/*
* Copyright (C) 2007 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.dex.code.DalvCode;
import com.android.dx.rop.code.AccessFlags;
import com.android.dx.rop.cst.CstMethodRef;
import com.android.dx.rop.cst.CstUtf8;
import com.android.dx.rop.type.TypeList;
import com.android.dx.util.AnnotatedOutput;
import com.android.dx.util.Hex;
import com.android.dx.util.Leb128Utils;
import java.io.PrintWriter;
/**
* Class that representats a method of a class.
*/
public final class EncodedMethod extends EncodedMember
implements Comparable<EncodedMethod> {
/** {@code non-null;} constant for the method */
private final CstMethodRef method;
/**
* {@code null-ok;} code for the method, if the method is neither
* {@code abstract} nor {@code native}
*/
private final CodeItem code;
/**
* Constructs an instance.
*
* @param method {@code non-null;} constant for the method
* @param accessFlags access flags
* @param code {@code null-ok;} code for the method, if it is neither
* {@code abstract} nor {@code native}
* @param throwsList {@code non-null;} list of possibly-thrown exceptions,
* just used in generating debugging output (listings)
*/
public EncodedMethod(CstMethodRef method, int accessFlags,
DalvCode code, TypeList throwsList) {
super(accessFlags);
if (method == null) {
throw new NullPointerException("method == null");
}
this.method = method;
if (code == null) {
this.code = null;
} else {
boolean isStatic = (accessFlags & AccessFlags.ACC_STATIC) != 0;
this.code = new CodeItem(method, code, isStatic, throwsList);
}
}
/** {@inheritDoc} */
public boolean equals(Object other) {
if (! (other instanceof EncodedMethod)) {
return false;
}
return compareTo((EncodedMethod) other) == 0;
}
/**
* {@inheritDoc}
*
* <p><b>Note:</b> This compares the method constants only,
* ignoring any associated code, because it should never be the
* case that two different items with the same method constant
* ever appear in the same list (or same file, even).</p>
*/
public int compareTo(EncodedMethod other) {
return method.compareTo(other.method);
}
/** {@inheritDoc} */
@Override
public String toString() {
StringBuffer sb = new StringBuffer(100);
sb.append(getClass().getName());
sb.append('{');
sb.append(Hex.u2(getAccessFlags()));
sb.append(' ');
sb.append(method);
if (code != null) {
sb.append(' ');
sb.append(code);
}
sb.append('}');
return sb.toString();
}
/** {@inheritDoc} */
@Override
public void addContents(DexFile file) {
MethodIdsSection methodIds = file.getMethodIds();
MixedItemSection wordData = file.getWordData();
methodIds.intern(method);
if (code != null) {
wordData.add(code);
}
}
/** {@inheritDoc} */
public final String toHuman() {
return method.toHuman();
}
/** {@inheritDoc} */
@Override
public final CstUtf8 getName() {
return method.getNat().getName();
}
/** {@inheritDoc} */
@Override
public void debugPrint(PrintWriter out, boolean verbose) {
if (code == null) {
out.println(getRef().toHuman() + ": abstract or native");
} else {
code.debugPrint(out, " ", verbose);
}
}
/**
* Gets the constant for the method.
*
* @return {@code non-null;} the constant
*/
public final CstMethodRef getRef() {
return method;
}
/** {@inheritDoc} */
@Override
public int encode(DexFile file, AnnotatedOutput out,
int lastIndex, int dumpSeq) {
int methodIdx = file.getMethodIds().indexOf(method);
int diff = methodIdx - lastIndex;
int accessFlags = getAccessFlags();
int codeOff = OffsettedItem.getAbsoluteOffsetOr0(code);
boolean hasCode = (codeOff != 0);
boolean shouldHaveCode = (accessFlags &
(AccessFlags.ACC_ABSTRACT | AccessFlags.ACC_NATIVE)) == 0;
/*
* Verify that code appears if and only if a method is
* declared to have it.
*/
if (hasCode != shouldHaveCode) {
throw new UnsupportedOperationException(
"code vs. access_flags mismatch");
}
if (out.annotates()) {
out.annotate(0, String.format(" [%x] %s", dumpSeq,
method.toHuman()));
out.annotate(Leb128Utils.unsignedLeb128Size(diff),
" method_idx: " + Hex.u4(methodIdx));
out.annotate(Leb128Utils.unsignedLeb128Size(accessFlags),
" access_flags: " +
AccessFlags.methodString(accessFlags));
out.annotate(Leb128Utils.unsignedLeb128Size(codeOff),
" code_off: " + Hex.u4(codeOff));
}
out.writeUnsignedLeb128(diff);
out.writeUnsignedLeb128(accessFlags);
out.writeUnsignedLeb128(codeOff);
return methodIdx;
}
}
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