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/*
* Copyright 2013, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.dexlib2.analysis;
import com.google.common.base.Strings;
import org.jf.dexlib2.iface.Method;
import org.jf.dexlib2.iface.reference.FieldReference;
import org.jf.dexlib2.iface.reference.MethodReference;
import org.jf.dexlib2.immutable.reference.ImmutableFieldReference;
import org.jf.dexlib2.util.TypeUtils;
import org.jf.util.ExceptionWithContext;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
public class ArrayProto implements TypeProto {
protected final ClassPath classPath;
protected final int dimensions;
protected final String elementType;
public ArrayProto(@Nonnull ClassPath classPath, @Nonnull String type) {
this.classPath = classPath;
int i=0;
while (type.charAt(i) == '[') {
i++;
if (i == type.length()) {
throw new ExceptionWithContext("Invalid array type: %s", type);
}
}
if (i == 0) {
throw new ExceptionWithContext("Invalid array type: %s", type);
}
dimensions = i;
elementType = type.substring(i);
}
@Override public String toString() { return getType(); }
@Nonnull @Override public ClassPath getClassPath() { return classPath; }
@Nonnull @Override public String getType() { return makeArrayType(elementType, dimensions); }
public int getDimensions() { return dimensions; }
@Override public boolean isInterface() { return false; }
/**
* @return The base element type of this array. E.g. This would return Ljava/lang/String; for [[Ljava/lang/String;
*/
@Nonnull public String getElementType() { return elementType; }
/**
* @return The immediate element type of this array. E.g. This would return [Ljava/lang/String; for
* [[Ljava/lang/String;
*/
@Nonnull public String getImmediateElementType() {
if (dimensions > 1) {
return makeArrayType(elementType, dimensions-1);
}
return elementType;
}
@Override public boolean implementsInterface(@Nonnull String iface) {
return iface.equals("Ljava/lang/Cloneable;") || iface.equals("Ljava/io/Serializable;");
}
@Nullable @Override
public String getSuperclass() {
return "Ljava/lang/Object;";
}
@Nonnull @Override
public TypeProto getCommonSuperclass(@Nonnull TypeProto other) {
if (other instanceof ArrayProto) {
if (TypeUtils.isPrimitiveType(getElementType()) ||
TypeUtils.isPrimitiveType(((ArrayProto)other).getElementType())) {
if (dimensions == ((ArrayProto)other).dimensions &&
getElementType().equals(((ArrayProto)other).getElementType())) {
return this;
}
return classPath.getClass("Ljava/lang/Object;");
}
if (dimensions == ((ArrayProto)other).dimensions) {
TypeProto thisClass = classPath.getClass(elementType);
TypeProto otherClass = classPath.getClass(((ArrayProto)other).elementType);
TypeProto mergedClass = thisClass.getCommonSuperclass(otherClass);
if (thisClass == mergedClass) {
return this;
}
if (otherClass == mergedClass) {
return other;
}
return classPath.getClass(makeArrayType(mergedClass.getType(), dimensions));
}
int dimensions = Math.min(this.dimensions, ((ArrayProto)other).dimensions);
return classPath.getClass(makeArrayType("Ljava/lang/Object;", dimensions));
}
if (other instanceof ClassProto) {
try {
if (other.isInterface()) {
if (implementsInterface(other.getType())) {
return other;
}
}
} catch (UnresolvedClassException ex) {
// ignore
}
return classPath.getClass("Ljava/lang/Object;");
}
// otherwise, defer to the other class' getCommonSuperclass
return other.getCommonSuperclass(this);
}
private static final String BRACKETS = Strings.repeat("[", 256);
@Nonnull
private static String makeArrayType(@Nonnull String elementType, int dimensions) {
return BRACKETS.substring(0, dimensions) + elementType;
}
@Override
@Nullable
public FieldReference getFieldByOffset(int fieldOffset) {
if (fieldOffset==8) {
return new ImmutableFieldReference(getType(), "length", "int");
}
return null;
}
@Override
@Nullable
public Method getMethodByVtableIndex(int vtableIndex) {
return classPath.getClass("Ljava/lang/Object;").getMethodByVtableIndex(vtableIndex);
}
@Override public int findMethodIndexInVtable(@Nonnull MethodReference method) {
return classPath.getClass("Ljava/lang/Object;").findMethodIndexInVtable(method);
}
}
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