Java example source code file (INVOKEINTERFACE.java)

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class, classgenexception, invokeinstruction, invokeinterface, ioexception, number, skip, string

The INVOKEINTERFACE.java Java example source code

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package com.sun.org.apache.bcel.internal.generic;

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import com.sun.org.apache.bcel.internal.classfile.ConstantPool;
import com.sun.org.apache.bcel.internal.Constants;
import com.sun.org.apache.bcel.internal.ExceptionConstants;

import java.io.*;
import com.sun.org.apache.bcel.internal.util.ByteSequence;

/**
 * INVOKEINTERFACE - Invoke interface method
 * <PRE>Stack: ..., objectref, [arg1, [arg2 ...]] -> ...

* * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm */ public final class INVOKEINTERFACE extends InvokeInstruction { private int nargs; // Number of arguments on stack (number of stack slots), called "count" in vmspec2 /** * Empty constructor needed for the Class.newInstance() statement in * Instruction.readInstruction(). Not to be used otherwise. */ INVOKEINTERFACE() {} public INVOKEINTERFACE(int index, int nargs) { super(Constants.INVOKEINTERFACE, index); length = 5; if(nargs < 1) throw new ClassGenException("Number of arguments must be > 0 " + nargs); this.nargs = nargs; } /** * Dump instruction as byte code to stream out. * @param out Output stream */ public void dump(DataOutputStream out) throws IOException { out.writeByte(opcode); out.writeShort(index); out.writeByte(nargs); out.writeByte(0); } /** * The <B>count argument according to the Java Language Specification, * Second Edition. */ public int getCount() { return nargs; } /** * Read needed data (i.e., index) from file. */ protected void initFromFile(ByteSequence bytes, boolean wide) throws IOException { super.initFromFile(bytes, wide); length = 5; nargs = bytes.readUnsignedByte(); bytes.readByte(); // Skip 0 byte } /** * @return mnemonic for instruction with symbolic references resolved */ public String toString(ConstantPool cp) { return super.toString(cp) + " " + nargs; } public int consumeStack(ConstantPoolGen cpg) { // nargs is given in byte-code return nargs; // nargs includes this reference } public Class[] getExceptions() { Class[] cs = new Class[4 + ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length]; System.arraycopy(ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION, 0, cs, 0, ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length); cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+3] = ExceptionConstants.INCOMPATIBLE_CLASS_CHANGE_ERROR; cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+2] = ExceptionConstants.ILLEGAL_ACCESS_ERROR; cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length+1] = ExceptionConstants.ABSTRACT_METHOD_ERROR; cs[ExceptionConstants.EXCS_INTERFACE_METHOD_RESOLUTION.length] = ExceptionConstants.UNSATISFIED_LINK_ERROR; return cs; } /** * Call corresponding visitor method(s). The order is: * Call visitor methods of implemented interfaces first, then * call methods according to the class hierarchy in descending order, * i.e., the most specific visitXXX() call comes last. * * @param v Visitor object */ public void accept(Visitor v) { v.visitExceptionThrower(this); v.visitTypedInstruction(this); v.visitStackConsumer(this); v.visitStackProducer(this); v.visitLoadClass(this); v.visitCPInstruction(this); v.visitFieldOrMethod(this); v.visitInvokeInstruction(this); v.visitINVOKEINTERFACE(this); } }