org.aspectj/bcel-builder/src/main/java/org/aspectj/apache/bcel/generic/InvokeInstruction.java

package org.aspectj.apache.bcel.generic;

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 * reserved.
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 * Redistribution and use in source and binary forms, with or without
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 *    if any, must include the following acknowledgment:
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 *        Apache Software Foundation (https://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
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 * This software consists of voluntary contributions made by many
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 */
import java.util.StringTokenizer;

import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.classfile.Constant;
import org.aspectj.apache.bcel.classfile.ConstantPool;

/**
 * Super class for the INVOKExxx family of instructions.
 *
 * @version $Id: InvokeInstruction.java,v 1.6 2009/10/05 17:35:36 aclement Exp $
 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
 */
public class InvokeInstruction extends FieldOrMethod {

	/**
	 * @param index to constant pool
	 */
	public InvokeInstruction(short opcode, int index) {
		super(opcode, index);
	}

	/**
	 * @return mnemonic for instruction with symbolic references resolved
	 */
	public String toString(ConstantPool cp) {
		Constant c = cp.getConstant(index);
		StringTokenizer tok = new StringTokenizer(cp.constantToString(c));

		return Constants.OPCODE_NAMES[opcode] + " " + tok.nextToken().replace('.', '/') + tok.nextToken();
	}

	/**
	 * Also works for instructions whose stack effect depends on the constant pool entry they reference.
	 *
	 * @return Number of words consumed from stack by this instruction
	 */
	public int consumeStack(ConstantPool cpg) {
		String signature = getSignature(cpg);
		int sum = Type.getArgumentSizes(signature);
		if (opcode != Constants.INVOKESTATIC) {
			sum += 1;
		}
		return sum;
	}

	/**
	 * Also works for instructions whose stack effect depends on the constant pool entry they reference.
	 *
	 * @return Number of words produced onto stack by this instruction
	 */
	public int produceStack(ConstantPool cpg) {
		return getReturnType(cpg).getSize();
	}

	/**
	 * @return return type of referenced method.
	 */
	public Type getType(ConstantPool cpg) {
		return getReturnType(cpg);
	}

	/**
	 * @return name of referenced method.
	 */
	public String getMethodName(ConstantPool cpg) {
		return getName(cpg);
	}

	/**
	 * @return return type of referenced method.
	 */
	public Type getReturnType(ConstantPool cpg) {
		return Type.getReturnType(getSignature(cpg));
	}

	/**
	 * @return argument types of referenced method.
	 */
	public Type[] getArgumentTypes(ConstantPool cpg) {
		return Type.getArgumentTypes(getSignature(cpg));
	}
}