Package org.aspectj.apache.bcel.generic

Source Code of org.aspectj.apache.bcel.generic.InvokeInstruction

package org.aspectj.apache.bcel.generic;

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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));
  }
}
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