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

import java.io.DataOutputStream;
import java.io.IOException;

import com.sun.org.apache.bcel.internal.Const;
import com.sun.org.apache.bcel.internal.ExceptionConst;
import com.sun.org.apache.bcel.internal.classfile.ConstantPool;
import com.sun.org.apache.bcel.internal.util.ByteSequence;

INVOKEINTERFACE - Invoke interface method
Stack: ..., objectref, [arg1, [arg2 ...]] -> ...
See Also:
Version:$Id: INVOKEINTERFACE.java 1747278 2016-06-07 17:28:43Z britter $
/** * INVOKEINTERFACE - Invoke interface method * <PRE>Stack: ..., objectref, [arg1, [arg2 ...]] -&gt; ...</PRE> * * @version $Id: INVOKEINTERFACE.java 1747278 2016-06-07 17:28:43Z britter $ * @see * <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-6.html#jvms-6.5.invokeinterface"> * The invokeinterface instruction in The Java Virtual Machine Specification</a> */
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.
/** * Empty constructor needed for the Class.newInstance() statement in * Instruction.readInstruction(). Not to be used otherwise. */
INVOKEINTERFACE() { } public INVOKEINTERFACE(final int index, final int nargs) { super(Const.INVOKEINTERFACE, index); super.setLength(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.
Params:
  • out – Output stream
/** * Dump instruction as byte code to stream out. * @param out Output stream */
@Override public void dump( final DataOutputStream out ) throws IOException { out.writeByte(super.getOpcode()); out.writeShort(super.getIndex()); out.writeByte(nargs); out.writeByte(0); }
The count argument according to the Java Language Specification, Second Edition.
/** * The <B>count</B> argument according to the Java Language Specification, * Second Edition. */
public int getCount() { return nargs; }
Read needed data (i.e., index) from file.
/** * Read needed data (i.e., index) from file. */
@Override protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { super.initFromFile(bytes, wide); super.setLength(5); nargs = bytes.readUnsignedByte(); bytes.readByte(); // Skip 0 byte }
Returns:mnemonic for instruction with symbolic references resolved
/** * @return mnemonic for instruction with symbolic references resolved */
@Override public String toString( final ConstantPool cp ) { return super.toString(cp) + " " + nargs; } @Override public int consumeStack( final ConstantPoolGen cpg ) { // nargs is given in byte-code return nargs; // nargs includes this reference } @Override public Class<?>[] getExceptions() { return ExceptionConst.createExceptions(ExceptionConst.EXCS.EXCS_INTERFACE_METHOD_RESOLUTION, ExceptionConst.UNSATISFIED_LINK_ERROR, ExceptionConst.ABSTRACT_METHOD_ERROR, ExceptionConst.ILLEGAL_ACCESS_ERROR, ExceptionConst.INCOMPATIBLE_CLASS_CHANGE_ERROR); }
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.
Params:
  • v – Visitor object
/** * 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 */
@Override public void accept( final 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); } }