src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements.test/src/org/graalvm/compiler/replacements/test/StringCompareToTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * 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.
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package org.graalvm.compiler.replacements.test;

import org.graalvm.compiler.nodes.StructuredGraph;
import org.graalvm.compiler.replacements.nodes.ArrayCompareToNode;
import org.junit.Assert;
import org.junit.Assume;
import org.junit.Test;

import jdk.vm.ci.amd64.AMD64;
import jdk.vm.ci.aarch64.AArch64;
import jdk.vm.ci.code.InstalledCode;
import jdk.vm.ci.meta.ResolvedJavaMethod;

/**
 * Tests compareTo method intrinsic.
 */
public class StringCompareToTest extends MethodSubstitutionTest {

    private ResolvedJavaMethod realMethod = null;
    private ResolvedJavaMethod testMethod = null;
    private InstalledCode testCode = null;

    private final String[] testData = new String[]{
                    "A", "\uFF21", "AB", "A", "a", "Ab", "AA", "\uFF21",
                    "A\uFF21", "ABC", "AB", "ABcD", "ABCD\uFF21\uFF21", "ABCD\uFF21", "ABCDEFG\uFF21", "ABCD",
                    "ABCDEFGH\uFF21\uFF21", "\uFF22", "\uFF21\uFF22", "\uFF21A",
                    "\uFF21\uFF21",
                    "\u043c\u0430\u043c\u0430\u0020\u043c\u044b\u043b\u0430\u0020\u0440\u0430\u043c\u0443\u002c\u0020\u0440\u0430\u043c\u0430\u0020\u0441\u044a\u0435\u043b\u0430\u0020\u043c\u0430\u043c\u0443",
                    "crazy dog jumps over laszy fox",
                    "some-string\0xff",
                    "XMM-XMM-YMM-YMM-ZMM-ZMM-ZMM-ZMM-",
                    "XMM-XMM+YMM-YMM-ZMM-ZMM-ZMM-ZMM-",
                    "XMM-XMM-YMM-YMM+ZMM-ZMM-ZMM-ZMM-",
                    "XMM-XMM-YMM-YMM-ZMM-ZMM-ZMM-ZMM+",
                    "XMM-XMM-XMM-XMM-YMM-YMM-YMM-YMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-",
                    "XMM-XMM-XMM-XMM+YMM-YMM-YMM-YMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-",
                    "XMM-XMM-XMM-XMM-YMM-YMM-YMM-YMM+ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-",
                    "XMM-XMM-XMM-XMM-YMM-YMM-YMM-YMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM-ZMM+",
                    ""
    };

    public StringCompareToTest() {
        Assume.assumeTrue((getTarget().arch instanceof AMD64) || (getTarget().arch instanceof AArch64));

        realMethod = getResolvedJavaMethod(String.class, "compareTo", String.class);
        testMethod = getResolvedJavaMethod("stringCompareTo");
        StructuredGraph graph = testGraph("stringCompareTo");

        // Check to see if the resulting graph contains the expected node
        StructuredGraph replacement = getReplacements().getSubstitution(realMethod, -1, false, null);
        if (replacement == null) {
            assertInGraph(graph, ArrayCompareToNode.class);
        }

        // Force compilation
        testCode = getCode(testMethod);
        Assert.assertNotNull(testCode);
    }

    private void executeStringCompareTo(String s0, String s1) {
        Object expected = invokeSafe(realMethod, s0, s1);
        // Verify that the original method and the substitution produce the same value
        assertDeepEquals(expected, invokeSafe(testMethod, null, s0, s1));
        // Verify that the generated code and the original produce the same value
        assertDeepEquals(expected, executeVarargsSafe(testCode, s0, s1));
    }

    public static int stringCompareTo(String a, String b) {
        return a.compareTo(b);
    }

    @Test
    public void testEqualString() {
        String s = "equal-string";
        executeStringCompareTo(s, new String(s.toCharArray()));
    }

    @Test
    public void testDifferentString() {
        // Smoke test for primary cases
        executeStringCompareTo("AAAAAAAA", "");
        // LL
        executeStringCompareTo("some-stringA", "some-string\0xff");
        // UU
        executeStringCompareTo("\u2241AAAAAAAB", "\u2241\u0041\u0041\u0041\u0041\u0041\u0041\u0041\uFF41");
        // LU
        executeStringCompareTo("AAAAAAAAB", "\u0041\u0041\u0041\u0041\u0041\u0041\u0041\u0041\uFF41");
    }

    @Test
    public void testAllStrings() {
        for (String s0 : testData) {
            for (String s1 : testData) {
                try {
                    executeStringCompareTo(s0, s1);
                } catch (AssertionError ex) {
                    System.out.println("FAIL: '" + ex + "'");
                    System.out.println(" ***: s0 '" + s0 + "'");
                    System.out.println(" ***: s1 '" + s1 + "'");
                    throw ex;
                }
            }
        }
    }
}