/*
 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.truffle.sl.nodes.instrument;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.frame.*;
import com.oracle.truffle.api.instrument.*;
import com.oracle.truffle.api.nodes.*;
import com.oracle.truffle.sl.nodes.*;
import com.oracle.truffle.sl.runtime.*;

/**
 * A Truffle node that can be inserted into a Simple AST (assumed not to have executed yet) to
 * enable "instrumentation" of a {@link SLStatementNode}. Tools wishing to interact with AST
 * execution may attach {@link Instrument}s to the {@link Probe} uniquely associated with the
 * wrapper, and to which this wrapper routes {@link ExecutionEvents}.
 */
public final class SLStatementWrapper extends SLStatementNode implements Wrapper {

    @Child private SLStatementNode child;

    private final Probe probe;

    public SLStatementWrapper(SLContext context, SLStatementNode child) {
        super(child.getSourceSection());
        assert !(child instanceof SLStatementWrapper);
        this.probe = context.createProbe(child.getSourceSection());
        this.child = child;
    }

    @Override
    public SLStatementNode getNonWrapperNode() {
        return child;
    }

    public Node getChild() {
        return child;
    }

    public Probe getProbe() {
        return probe;
    }

    @TruffleBoundary
    public void tagAs(SyntaxTag tag) {
        probe.tagAs(tag);
    }

    @Override
    public void executeVoid(VirtualFrame frame) {
        this.tagAs(StandardSyntaxTag.STATEMENT);
        probe.enter(child, frame);

        try {
            child.executeVoid(frame);
            probe.leave(child, frame);
        } catch (KillException e) {
            throw (e);
        } catch (Exception e) {
            probe.leaveExceptional(child, frame, e);
            throw (e);
        }
    }

}