SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.vm.springcoat;

import cc.squirreljme.jdwp.host.JDWPHostState;
import cc.squirreljme.jdwp.host.JDWPHostValue;
import cc.squirreljme.jdwp.host.views.JDWPViewFrame;
import java.lang.ref.Reference;

/**
 * Viewer for frames.
 *
 * @since 2021/04/11
 */
public class DebugViewFrame
    implements JDWPViewFrame
{
    /** The state of the debugger. */
    protected final Reference<JDWPHostState> state;
    
    /**
     * Initializes the frame viewer.
     * 
     * @param __state The state.
     * @throws NullPointerException On null arguments.
     * @since 2021/04/11
     */
    public DebugViewFrame(Reference<JDWPHostState> __state)
    {
        if (__state == null)
            throw new NullPointerException("NARG");
        
        this.state = __state;
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/11
     */
    @Override
    public Object atClass(Object __which)
    {
        return ((SpringThreadFrame)__which).springClass;
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/11
     * @return
     */
    @Override
    public long atCodeIndex(Object __which)
    {
        return ((SpringThreadFrame)__which).pcIndex();
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/28
     */
    @Override
    public long atLineIndex(Object __which)
    {
        return ((SpringThreadFrame)__which).pcSourceLine();
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/11
     */
    @Override
    public int atMethodIndex(Object __which)
    {
        SpringThreadFrame which = (SpringThreadFrame)__which;
        return which.method().methodIndex;
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/11
     */
    @Override
    public boolean isValid(Object __which)
    {
        return (__which instanceof SpringThreadFrame);
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/14
     */
    @Override
    public boolean readValue(Object __which, int __index, JDWPHostValue __out)
    {
        __out.set(((SpringThreadFrame)__which).loadLocal(
            Object.class, __index));
        return true;
    }
    
    /**
     * {@inheritDoc}
     * @since 2021/04/14
     */
    @Override
    public int numValues(Object __which)
    {
        return ((SpringThreadFrame)__which).numLocals();
    }
}