de.enough.polish.postcompile.java5.EnumMethodVisitor.java Source code

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Here is the source code for de.enough.polish.postcompile.java5.EnumMethodVisitor.java

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/*
 * Created on Sep 13, 2006 at 12:10:06 AM.
 * 
 * Copyright (c) 2006 Michael Koch / Enough Software
 *
 * This file is part of J2ME Polish.
 *
 * J2ME Polish is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * J2ME Polish is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with J2ME Polish; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Commercial licenses are also available, please
 * refer to the accompanying LICENSE.txt or visit
 * http://www.j2mepolish.org for details.
 */
package de.enough.polish.postcompile.java5;

import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;
import org.objectweb.asm.commons.Method;

/**
 * @author mkoch
 *
 */
public class EnumMethodVisitor extends GeneratorAdapter implements Opcodes {
    private Type owner;
    private Method method;
    private EnumManager manager;

    public EnumMethodVisitor(MethodVisitor mv, int access, String name, String desc, String signature,
            String[] exceptions, Type owner) {
        super(mv, access, name, EnumManager.transform(desc));
        this.owner = owner;
        this.method = new Method(name, desc);
        this.manager = EnumManager.getInstance();
    }

    /* (non-Javadoc)
     * @see org.objectweb.asm.MethodAdapter#visitFieldInsn(int, java.lang.String, java.lang.String, java.lang.String)
     */
    public void visitFieldInsn(int opcode, String owner, String name, String desc) {
        if (GETSTATIC == opcode && this.manager.isEnumClass(desc)) {
            Integer value = (Integer) this.manager.getEnumValue(owner, name);
            push(value.intValue());
            return;
        }

        super.visitFieldInsn(opcode, owner, name, EnumManager.transform(desc));
    }

    /* (non-Javadoc)
     * @see org.objectweb.asm.MethodAdapter#visitMethodInsn(int, java.lang.String, java.lang.String, java.lang.String)
     */
    public void visitMethodInsn(int opcode, String owner, String name, String desc) {
        // TODO: Check for enum class name too.
        if (INVOKEVIRTUAL == opcode && "ordinal".equals(name)) {
            // As we converted the enum constant to int we dont need
            // to call ordinal() and can just continue.
            return;
        }

        super.visitMethodInsn(opcode, owner, name, EnumManager.transform(desc));
    }

    /* (non-Javadoc)
     * @see org.objectweb.asm.MethodAdapter#visitMultiANewArrayInsn(java.lang.String, int)
     */
    //  public void visitMultiANewArrayInsn(String desc, int dims)
    //  {
    //    super.visitMultiANewArrayInsn(transform(desc), dims);
    //  }

    /* (non-Javadoc)
     * @see org.objectweb.asm.MethodAdapter#visitTypeInsn(int, java.lang.String)
     */
    public void visitTypeInsn(int opcode, String desc) {
        if (CHECKCAST == opcode && EnumManager.getInstance().isEnumClass(desc)) {
            super.visitInsn(NOP);
        } else {
            super.visitTypeInsn(opcode, EnumManager.transform(desc));
        }
    }

    /* (non-Javadoc)
     * @see org.objectweb.asm.commons.LocalVariablesSorter#visitVarInsn(int, int)
     */
    public void visitVarInsn(int opcode, int var) {
        EnumManager manager = EnumManager.getInstance();
        LocalVariableInfo variable = new LocalVariableInfo(this.owner, this.method, var);

        if (ALOAD == opcode) {
            if (manager.contains(variable)) {
                opcode = ILOAD;
            }
        } else if (ASTORE == opcode) {
            if (manager.contains(variable)) {
                opcode = ISTORE;
            }
        }

        super.visitVarInsn(opcode, var);
    }

    /* (non-Javadoc)
     * @see org.objectweb.asm.commons.LocalVariablesSorter#visitLocalVariable(java.lang.String, java.lang.String, java.lang.String, org.objectweb.asm.Label, org.objectweb.asm.Label, int)
     */
    public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
        super.visitLocalVariable(name, EnumManager.transform(desc), signature, start, end, index);
    }
}