RTDeepSeq.java

/*
 * Copyright (c) 2007 BUSINESS OBJECTS SOFTWARE LIMITED
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *
 *     * Neither the name of Business Objects nor the names of its contributors
 *       may be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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/*
 * RTDeepSeq.java
 * Created: July 4, 2005
 * By: Raymond Cypher
 */
package org.openquark.cal.internal.runtime.lecc.functions;

import org.openquark.cal.internal.runtime.lecc.LECCMachineConfiguration;
import org.openquark.cal.internal.runtime.lecc.RTExecutionContext;
import org.openquark.cal.internal.runtime.lecc.RTResultFunction;
import org.openquark.cal.internal.runtime.lecc.RTSupercombinator;
import org.openquark.cal.internal.runtime.lecc.RTValue;
import org.openquark.cal.runtime.CALExecutorException;


/**
 * Implements the built-in primitive function:
 * deepSeq :: a -> b -> b
 * defined in the Prelude module.
 * This function does a deep evaluation on the first argument and returns the second argument.
 *
 * The returned value is an RTValue.
 *
 * @author Raymond Cypher
 */
public final class RTDeepSeq extends RTSupercombinator {
    public static final RTDeepSeq $instance = new RTDeepSeq();

    private RTDeepSeq() {
        // Declared private to limit instantiation.
    }

    public static final RTDeepSeq make(RTExecutionContext $ec) {
        return $instance;
    }

    @Override
    public final int getArity() {
        return 2;
    }

    @Override
    public final RTValue f(final RTResultFunction rootNode, final RTExecutionContext $ec) throws CALExecutorException {
        // Arguments
        RTValue b = rootNode.getArgValue();
        RTValue a = rootNode.prevArg().getArgValue();

        // Release the fields in the root node to open them to garbage collection
        rootNode.clearMembers();

        return f2S (
                RTValue.lastRef(a.evaluate($ec), a = null),
                RTValue.lastRef(b, b = null),
                $ec);
    }

    @Override
    public final RTValue f2L(RTValue a, RTValue b, RTExecutionContext $ec) throws CALExecutorException {

        return f2S (
                RTValue.lastRef(a.evaluate($ec), a = null),
                RTValue.lastRef(b, b = null),
                $ec);
    }

    @Override
    public final RTValue f2S(RTValue a, RTValue b, RTExecutionContext $ec) throws CALExecutorException {

        $ec.incrementNMethodCalls();
        if (LECCMachineConfiguration.generateDebugCode() && $ec.isDebugProcessingNeeded(getQualifiedName())) {
            $ec.debugProcessing(getQualifiedName(), new RTValue[]{a, b});
        }
        if (!LECCMachineConfiguration.nonInterruptibleRuntime() && $ec.isQuitRequested()) {
            throw RTValue.INTERRUPT_EXCEPTION;
        }

        // Build up an application deepSeq to all members.

        return a.buildDeepSeq($instance, b);
    }
    /**
     * {@inheritDoc}
     */
    @Override
    public final String getModuleName () {
        //JUnit tested to equal its binding file value in RuntimeStringConstantsTest.
        return "Cal.Core.Prelude";
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public final String getUnqualifiedName () {
        //JUnit tested to equal its binding file value in RuntimeStringConstantsTest.
        return "deepSeq";
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public final String getQualifiedName() {
        //JUnit tested to equal its binding file value in RuntimeStringConstantsTest.
        return "Cal.Core.Prelude.deepSeq";
    }

}