| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| 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 |
| * <PRE>Stack: ..., objectref, [arg1, [arg2 ...]] -> ...</PRE> |
| * |
| * @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 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. |
| * @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 <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. |
| */ |
| @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 |
| } |
| |
| |
| /** |
| * @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. |
| * |
| * @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); |
| } |
| } |