AssumptionPartialEvaluationTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 *
 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.truffle.test;

import org.junit.Assert;
import org.junit.Test;

import org.graalvm.compiler.truffle.OptimizedCallTarget;
import org.graalvm.compiler.truffle.test.nodes.AbstractTestNode;
import org.graalvm.compiler.truffle.test.nodes.AssumptionCutsBranchTestNode;
import org.graalvm.compiler.truffle.test.nodes.ConstantWithAssumptionTestNode;
import org.graalvm.compiler.truffle.test.nodes.RootTestNode;
import com.oracle.truffle.api.Assumption;
import com.oracle.truffle.api.Truffle;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.nodes.InvalidAssumptionException;

public class AssumptionPartialEvaluationTest extends PartialEvaluationTest {
    public static Object constant42() {
        return 42;
    }

    @Test
    public void constantValue() {
        Assumption assumption = Truffle.getRuntime().createAssumption();
        AbstractTestNode result = new ConstantWithAssumptionTestNode(assumption, 42);
        RootTestNode rootNode = new RootTestNode(new FrameDescriptor(), "constantValue", result);
        OptimizedCallTarget callTarget = assertPartialEvalEquals("constant42", rootNode);
        Assert.assertTrue(callTarget.isValid());
        assertDeepEquals(42, callTarget.call());
        Assert.assertTrue(callTarget.isValid());
        try {
            assumption.check();
        } catch (InvalidAssumptionException e) {
            Assert.fail("Assumption must not have been invalidated.");
        }
        assumption.invalidate();
        try {
            assumption.check();
            Assert.fail("Assumption must have been invalidated.");
        } catch (InvalidAssumptionException e) {
        }
        Assert.assertFalse(callTarget.isValid());
        assertDeepEquals(43, callTarget.call());
    }

    /**
     * This tests whether a valid Assumption does successfully cut of the branch that is not
     * executed.
     */
    @Test
    public void assumptionBranchCutoff() {
        Assumption assumption = Truffle.getRuntime().createAssumption();
        AssumptionCutsBranchTestNode result = new AssumptionCutsBranchTestNode(assumption);
        RootTestNode rootNode = new RootTestNode(new FrameDescriptor(), "cutoffBranch", result);
        OptimizedCallTarget compilable = compileHelper("cutoffBranch", rootNode, new Object[0]);

        for (int i = 0; i < 100000; i++) {
            Assert.assertEquals(0, compilable.call(new Object[0]));
        }
        Assert.assertNull(result.getChildNode());
    }
}