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package org.jf.dexlib2.util;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.jf.dexlib2.AccessFlags;
import org.jf.dexlib2.Opcodes;
import org.jf.dexlib2.iface.ClassDef;
import org.jf.dexlib2.iface.Method;
import org.jf.dexlib2.iface.MethodImplementation;
import org.jf.dexlib2.iface.instruction.Instruction;
import org.jf.dexlib2.iface.instruction.ReferenceInstruction;
import org.jf.dexlib2.iface.reference.MethodReference;
import org.jf.dexlib2.iface.reference.Reference;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.List;
import java.util.Map;
public class SyntheticAccessorResolver {
public static final int METHOD = 0;
public static final int GETTER = 1;
public static final int SETTER = 2;
public static final int POSTFIX_INCREMENT = 3;
public static final int PREFIX_INCREMENT = 4;
public static final int POSTFIX_DECREMENT = 5;
public static final int PREFIX_DECREMENT = 6;
public static final int ADD_ASSIGNMENT = 7;
public static final int SUB_ASSIGNMENT = 8;
public static final int MUL_ASSIGNMENT = 9;
public static final int DIV_ASSIGNMENT = 10;
public static final int REM_ASSIGNMENT = 11;
public static final int AND_ASSIGNMENT = 12;
public static final int OR_ASSIGNMENT = 13;
public static final int XOR_ASSIGNMENT = 14;
public static final int SHL_ASSIGNMENT = 15;
public static final int SHR_ASSIGNMENT = 16;
public static final int USHR_ASSIGNMENT = 17;
private final SyntheticAccessorFSM syntheticAccessorFSM;
private final Map<String, ClassDef> classDefMap;
private final Map<String, AccessedMember> resolvedAccessors = Maps.newConcurrentMap();
public SyntheticAccessorResolver(@Nonnull Opcodes opcodes, @Nonnull Iterable<? extends ClassDef> classDefs) {
this.syntheticAccessorFSM = new SyntheticAccessorFSM(opcodes);
ImmutableMap.Builder<String, ClassDef> builder = ImmutableMap.builder();
for (ClassDef classDef: classDefs) {
builder.put(classDef.getType(), classDef);
}
this.classDefMap = builder.build();
}
public static boolean looksLikeSyntheticAccessor(String methodName) {
return methodName.startsWith("access$");
}
@Nullable
public AccessedMember getAccessedMember(@Nonnull MethodReference methodReference) {
String methodDescriptor = ReferenceUtil.getMethodDescriptor(methodReference);
AccessedMember accessedMember = resolvedAccessors.get(methodDescriptor);
if (accessedMember != null) {
return accessedMember;
}
String type = methodReference.getDefiningClass();
ClassDef classDef = classDefMap.get(type);
if (classDef == null) {
return null;
}
Method matchedMethod = null;
MethodImplementation matchedMethodImpl = null;
for (Method method: classDef.getMethods()) {
MethodImplementation methodImpl = method.getImplementation();
if (methodImpl != null) {
if (methodReferenceEquals(method, methodReference)) {
matchedMethod = method;
matchedMethodImpl = methodImpl;
break;
}
}
}
if (matchedMethod == null) {
return null;
}
//A synthetic accessor will be marked synthetic
if (!AccessFlags.SYNTHETIC.isSet(matchedMethod.getAccessFlags())) {
return null;
}
List<Instruction> instructions = ImmutableList.copyOf(matchedMethodImpl.getInstructions());
int accessType = syntheticAccessorFSM.test(instructions);
if (accessType >= 0) {
AccessedMember member =
new AccessedMember(accessType, ((ReferenceInstruction)instructions.get(0)).getReference());
resolvedAccessors.put(methodDescriptor, member);
return member;
}
return null;
}
public static class AccessedMember {
public final int accessedMemberType;
@Nonnull public final Reference accessedMember;
public AccessedMember(int accessedMemberType, @Nonnull Reference accessedMember) {
this.accessedMemberType = accessedMemberType;
this.accessedMember = accessedMember;
}
}
private static boolean methodReferenceEquals(@Nonnull MethodReference ref1, @Nonnull MethodReference ref2) {
// we already know the containing class matches
return ref1.getName().equals(ref2.getName()) &&
ref1.getReturnType().equals(ref2.getReturnType()) &&
ref1.getParameterTypes().equals(ref2.getParameterTypes());
}
}