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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

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 *

 * 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,

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package org.graalvm.compiler.hotspot.jdk9.test;

import static org.junit.Assume.assumeFalse;

import org.graalvm.compiler.core.common.CompilationIdentifier;

import org.graalvm.compiler.hotspot.replacements.StringUTF16Substitutions;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.java.NewArrayNode;

import org.graalvm.compiler.replacements.arraycopy.ArrayCopyCallNode;

import org.graalvm.compiler.replacements.test.MethodSubstitutionTest;

import org.graalvm.compiler.serviceprovider.JavaVersionUtil;

import org.graalvm.compiler.test.AddExports;

import org.junit.Test;

import jdk.vm.ci.code.InstalledCode;

import jdk.vm.ci.meta.ResolvedJavaMethod;

/**

 * Test substitutions for (innate) methods StringUTF16.toBytes and StringUTF16.getChars provided by

 * {@link StringUTF16Substitutions}.

 */

@AddExports({"java.base/java.lang"})

public final class StringUTF16ToBytesGetCharsTest extends MethodSubstitutionTest {

    private static final int N = 1000;

    private static final int N_OVERFLOW = 10;

    public StringUTF16ToBytesGetCharsTest() {

        assumeFalse(JavaVersionUtil.JAVA_SPEC <= 8);

    }

    @Test

    public void testStringUTF16ToBytes() throws ClassNotFoundException {

        Class<?> javaclass = Class.forName("java.lang.StringUTF16");

        ResolvedJavaMethod caller = getResolvedJavaMethod(javaclass, "toBytes", char[].class, int.class, int.class);

        StructuredGraph graph = getReplacements().getIntrinsicGraph(caller, CompilationIdentifier.INVALID_COMPILATION_ID, getDebugContext(), null);

        assertInGraph(graph, NewArrayNode.class);

        assertInGraph(graph, ArrayCopyCallNode.class);

        InstalledCode code = getCode(caller, graph);

        for (int srcOffset = 0; srcOffset < 2; srcOffset++) {

            for (int i = 0; i < N; i++) {

                int length = i2sz(i);

                char[] src = fillUTF16Chars(new char[length]);

                int copiedLength = Math.max(0, length - srcOffset);

                int srcDelta = Math.min(srcOffset, copiedLength);

                byte[] dst = (byte[]) invokeSafe(caller, null, src, srcDelta, copiedLength);

                assert dst.length == copiedLength * 2;

                byte[] dst2 = (byte[]) executeVarargsSafe(code, src, srcDelta, copiedLength);

                assertDeepEquals(dst, dst2);

            }

        }

        for (int srcOff = 0; srcOff < N_OVERFLOW; ++srcOff) {

            for (int len = 0; len < N_OVERFLOW; ++len) {

                char[] src = fillUTF16Chars(new char[N_OVERFLOW]);

                test(caller, null, src, srcOff, len);

            }

        }

    }

    @Test

    public void testStringUTF16getChars() throws ClassNotFoundException {

        Class<?> javaclass = Class.forName("java.lang.StringUTF16");

        ResolvedJavaMethod caller = getResolvedJavaMethod(javaclass, "getChars", byte[].class, int.class, int.class, char[].class, int.class);

        StructuredGraph graph = getReplacements().getIntrinsicGraph(caller, CompilationIdentifier.INVALID_COMPILATION_ID, getDebugContext(), null);

        assertInGraph(graph, ArrayCopyCallNode.class);

        InstalledCode code = getCode(caller, graph);

        for (int dstOffset = 0; dstOffset < 2; dstOffset++) {

            for (int srcOffset = 0; srcOffset < 2; srcOffset++) {

                for (int i = 0; i < N; i++) {

                    int length = i2sz(i);

                    byte[] src = fillUTF16Bytes(new byte[length * 2]);

                    char[] dst = new char[length];

                    int copiedLength = Math.max(0, length - Math.max(dstOffset, srcOffset));

                    int dstDelta = Math.min(dstOffset, copiedLength);

                    int srcDelta = Math.min(srcOffset, copiedLength);

                    invokeSafe(caller, null, src, srcDelta, srcDelta + copiedLength, dst, dstDelta);

                    char[] dst2 = new char[length];

                    executeVarargsSafe(code, src, srcDelta, srcDelta + copiedLength, dst2, dstDelta);

                    assertDeepEquals(dst, dst2);

                }

            }

        }

        for (int srcOff = 0; srcOff < N_OVERFLOW; ++srcOff) {

            for (int dstOff = 0; dstOff < N_OVERFLOW; ++dstOff) {

                for (int len = 0; len < N_OVERFLOW; ++len) {

                    byte[] src = fillUTF16Bytes(new byte[N_OVERFLOW]);

                    char[] dst = new char[N_OVERFLOW];

                    test(caller, null, src, srcOff, len, dst, dstOff);

                }

            }

        }

    }

    private static char[] fillUTF16Chars(char[] v) {

        for (int ch = 0, i = 0; i < v.length; i++, ch += 0x101) {

            v[i] = (char) ch;

        }

        return v;

    }

    private static byte[] fillUTF16Bytes(byte[] v) {

        for (int ch = 1, i = 0; i < v.length; i += 2, ch++) {

            v[i] = (byte) (ch - 1);

            v[i + 1] = (byte) ch;

        }

        return v;

    }

    private static int i2sz(int i) {

        return i * 3;

    }

}