BindingNodes.java

/*
 * Copyright (c) 2013, 2014 Oracle and/or its affiliates. All rights reserved. This
 * code is released under a tri EPL/GPL/LGPL license. You can use it,
 * redistribute it and/or modify it under the terms of the:
 *
 * Eclipse Public License version 1.0
 * GNU General Public License version 2
 * GNU Lesser General Public License version 2.1
 */
package org.jruby.truffle.nodes.core;

import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.FrameSlot;
import com.oracle.truffle.api.frame.MaterializedFrame;
import com.oracle.truffle.api.source.SourceSection;
import org.jruby.truffle.nodes.globals.GetFromThreadLocalNode;
import org.jruby.truffle.nodes.globals.WrapInThreadLocalNode;
import org.jruby.truffle.runtime.RubyArguments;
import org.jruby.truffle.runtime.RubyContext;
import org.jruby.truffle.runtime.core.RubyBinding;
import org.jruby.truffle.runtime.core.RubySymbol;

@CoreClass(name = "Binding")
public abstract class BindingNodes {

    @CoreMethod(names = "local_variable_get", required = 1)
    public abstract static class LocalVariableGetNode extends CoreMethodNode {

        public LocalVariableGetNode(RubyContext context, SourceSection sourceSection) {
            super(context, sourceSection);
        }

        public LocalVariableGetNode(LocalVariableGetNode prev) {
            super(prev);
        }

        @Specialization
        public Object localVariableGet(RubyBinding binding, RubySymbol symbol) {
            notDesignedForCompilation();

            final MaterializedFrame frame = binding.getFrame();

            Object value = frame.getValue(frame.getFrameDescriptor().findFrameSlot(symbol.toString()));

            // TODO(CS): temporary hack for $_
            if (symbol.toString().equals("$_")) {
                value = GetFromThreadLocalNode.get(getContext(), value);
            }

            return value;
        }
    }

    @CoreMethod(names = "local_variable_set", required = 2)
    public abstract static class LocalVariableSetNode extends CoreMethodNode {

        public LocalVariableSetNode(RubyContext context, SourceSection sourceSection) {
            super(context, sourceSection);
        }

        public LocalVariableSetNode(LocalVariableSetNode prev) {
            super(prev);
        }

        @Specialization
        public Object localVariableSetNode(RubyBinding binding, RubySymbol symbol, Object value) {
            notDesignedForCompilation();

            // TODO(CS): temporary hack for $_
            if (symbol.toString().equals("$_")) {
                value = WrapInThreadLocalNode.wrap(getContext(), value);
            }

            MaterializedFrame frame = binding.getFrame();

            while (true) {
                final FrameSlot frameSlot = frame.getFrameDescriptor().findFrameSlot(symbol.toString());

                if (frameSlot != null) {
                    frame.setObject(frameSlot, value);
                    break;
                }

                frame = RubyArguments.getDeclarationFrame(frame.getArguments());

                if (frame == null) {
                    throw new UnsupportedOperationException();
                }
            }

            return value;
        }
    }

}