com.packenius.datadivider.javaclass.cp.CpMethodHandle Maven / Gradle / Ivy

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package com.packenius.datadivider.javaclass.cp;

import com.packenius.datadivider.javaclass.ConstantPool;
import com.packenius.datadivider.javaclass.ConstantPoolEntryCrossPointer;
import com.packenius.dumpapi.DumpReader;
import com.packenius.dumpapi.DumpReader.BigEndianUnsigned2ByteInteger;

/**
 * @author Christian Packenius, 2016.
 */
public class CpMethodHandle extends ConstantPoolEntry {
    /**
     * Typ des Methoden-Handles, muss zwischen 1 und 9 liegen.
     */
    public final short referenceKind;

    private static final String[] refKinds = { null, "REF_getField :: getfield C.f:T",
            "REF_getStatic :: getstatic C.f:T", "REF_putField :: putfield C.f:T", "REF_putStatic :: putstatic C.f:T",
            "REF_invokeVirtual :: invokevirtual C.m:(A*)T", "REF_invokeStatic :: invokestatic C.m:(A*)T",
            "REF_invokeSpecial :: invokespecial C.m:(A*)T",
            "REF_newInvokeSpecial :: new C; dup; invokespecial C.:(A*)V",
            "REF_invokeInterface :: invokeinterface C.m:(A*)T" };

    /**
     * Index im Konstantenpool, in Abhängigkeit vom obigen Typ.
     */
    public final int referenceIndex;

    /**
     * Konstruktor.
     */
    public CpMethodHandle(DumpReader reader, int id, ConstantPool constantpool) {
        super(reader, id);

        referenceKind = reader.readU1("Reference kind: ##DEC##").value;

        BigEndianUnsigned2ByteInteger referenceIndexDumpBlock = reader.readBigEndianU2("Reference index: ###DEC##");
        referenceIndexDumpBlock.setCrossPointer(new ConstantPoolEntryCrossPointer(referenceIndexDumpBlock.value));
        referenceIndex = referenceIndexDumpBlock.value;

        setEndAddress(reader);
    }

    @Override
    public String getDescription() {
        return "Constant pool entry #" + id + "\r\nMethod handle constant, reference #" + referenceIndex
                + "\r\nReference kind " + referenceKind + ": " + refKinds[referenceKind];
    }

    @Override
    public String toString() {
        ConstantPool cp = reader.getUserObject(ConstantPool.class);
        return "Method handle: " + refKinds[referenceKind] + " :: " + cp.getEntry(referenceIndex) + " [#" + id + "]";
    }
}