/* * Copyright (c) 2018, 2025, 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. */ /* * @test * @bug 8214031 8214114 8236546 8353565 * @summary Verify switch expressions embedded in various statements work properly. * @compile ExpressionSwitchEmbedding.java * @run main ExpressionSwitchEmbedding */ public class ExpressionSwitchEmbedding { public static void main(String... args) { new ExpressionSwitchEmbedding().run(); new ExpressionSwitchEmbedding().runStackMapMergingTest(); } private void run() { { int i = 6; int o = 0; while (switch (i) { case 1: i = 0; yield true; case 2: i = 1; yield true; case 3, 4: i--; if (i == 2 || i == 4) { yield switch (i) { case 2 -> true; case 4 -> false; default -> throw new IllegalStateException(); }; } else { yield true; } default: i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; }) { o++; } if (o != 6 && i >= 0) { throw new IllegalStateException(); } } { int i = 6; int o = 0; while (switch (i) { case 1: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 0; yield true; } case 2: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 1; yield true; } case 3, 4: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; if (i == 2 || i == 4) { try { yield switch (i) { case 2 -> throw new ResultException(true); case 4 -> false; default -> throw new IllegalStateException(); }; } catch (ResultException ex) { yield ex.result; } } else { yield true; } } default: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; } throw new AssertionError(); }) { o++; } if (o != 6 && i >= 0) { throw new IllegalStateException(); } } { int i = 6; int o = 0; if (switch (i) { case 1: i = 0; yield true; case 2: i = 1; yield true; case 3, 4: i--; if (i == 2 || i == 4) { yield (switch (i) { case 2 -> 3; case 4 -> 5; default -> throw new IllegalStateException(); }) == i + 1; } else { yield true; } default: i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; }) { o++; } if (o != 1 && i != 5) { throw new IllegalStateException(); } } { int i = 6; int o = 0; if (switch (i) { case 1: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 0; yield true; } case 2: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 1; yield true; } case 3, 4: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; if (i == 2 || i == 4) { try { yield switch (i) { case 2 -> throw new ResultException(true); case 4 -> false; default -> throw new IllegalStateException(); }; } catch (ResultException ex) { yield ex.result; } } else { yield true; } } default: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; } throw new AssertionError(); }) { o++; } if (o != 1 && i != 5) { throw new IllegalStateException(); } } { int o = 0; for (int i = 6; (switch (i) { case 1: i = 0; yield true; case 2: i = 1; yield true; case 3, 4: i--; if (i == 2 || i == 4) { yield switch (i) { case 2 -> true; case 4 -> false; default -> throw new IllegalStateException(); }; } else { yield true; } default: i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; }); ) { o++; } if (o != 6) { throw new IllegalStateException(); } } { int o = 0; for (int i = 6; (switch (i) { case 1: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 0; yield true; } case 2: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 1; yield true; } case 3, 4: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; if (i == 2 || i == 4) { try { yield switch (i) { case 2 -> throw new ResultException(true); case 4 -> false; default -> throw new IllegalStateException(); }; } catch (ResultException ex) { yield ex.result; } } else { yield true; } } default: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; } throw new AssertionError(); }); ) { o++; } if (o != 6) { throw new IllegalStateException(); } } { int i = 6; int o = 0; do { o++; } while (switch (i) { case 1: i = 0; yield true; case 2: i = 1; yield true; case 3, 4: i--; if (i == 2 || i == 4) { yield switch (i) { case 2 -> true; case 4 -> false; default -> throw new IllegalStateException(); }; } else { yield true; } default: i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; }); if (o != 6 && i >= 0) { throw new IllegalStateException(); } } { int i = 6; int o = 0; do { o++; } while (switch (i) { case 1: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 0; yield true; } case 2: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i = 1; yield true; } case 3, 4: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; if (i == 2 || i == 4) { try { yield switch (i) { case 2 -> throw new ResultException(true); case 4 -> false; default -> throw new IllegalStateException(); }; } catch (ResultException ex) { yield ex.result; } } else { yield true; } } default: try { new ExpressionSwitchEmbedding().throwException(); } catch (Throwable t) { i--; yield switch (i) { case -1 -> false; case 3 -> true; default -> true; }; } throw new AssertionError(); }); if (o != 6 && i >= 0) { throw new IllegalStateException(); } } { String s = ""; Object o = switch (s) { default -> s != null && s == s; }; if (!(Boolean) o) { throw new IllegalStateException(); } } } private void runStackMapMergingTest() { //JDK-8353565: verify that two types neither of which is a subtype of the other //can be merged while computing StackMaps. if (!(computeTypeAtMergePoint1(E.A, E.A) instanceof Impl1a)) { throw new AssertionError("Unexpected result"); } if (runMethodForInterfaceTypeAtMergePoint1(E.A, E.A) != 1) { throw new AssertionError("Unexpected result"); } if (runMethodForInterfaceTypeAtMergePoint2(E.A, E.A) != 2) { throw new AssertionError("Unexpected result"); } } private Root computeTypeAtMergePoint1(E e1, E e2) { return (Root) switch (e1) { case A -> switch (e2) { case A -> new Impl1a(); case B -> new Impl1b(); case C -> new Impl1c(); }; case B -> switch (e2) { case A -> new Impl2a(); case B -> new Impl2b(); case C -> new Impl2c(); }; case C -> switch (e2) { case A -> new Impl3a(); case B -> new Impl3b(); case C -> new Impl3c(); }; }; } private int runMethodForInterfaceTypeAtMergePoint1(E e1, E e2) { return (switch (e1) { case A -> switch (e2) { case A -> new C1(); case B -> new C1(); case C -> new C1(); }; case B -> switch (e2) { case A -> new C2(); case B -> new C2(); case C -> new C2(); }; case C -> switch (e2) { case A -> new C3(); case B -> new C3(); case C -> new C3(); }; }).test1(); } private int runMethodForInterfaceTypeAtMergePoint2(E e1, E e2) { return (switch (e1) { case A -> switch (e2) { case A -> new C1(); case B -> new C1(); case C -> new C1(); }; case B -> switch (e2) { case A -> new C2(); case B -> new C2(); case C -> new C2(); }; case C -> switch (e2) { case A -> new C3(); case B -> new C3(); case C -> new C3(); }; }).test2(); } private static class Root {} private static class Base1 extends Root {} private static class Impl1a extends Base1 {} private static class Impl1b extends Base1 {} private static class Impl1c extends Base1 {} private static class Base2 extends Root {} private static class Impl2a extends Base2 {} private static class Impl2b extends Base2 {} private static class Impl2c extends Base2 {} private static class Base3 extends Root {} private static class Impl3a extends Base3 {} private static class Impl3b extends Base3 {} private static class Impl3c extends Base3 {} private static interface RootInterface1 { public default int test1() { return 1; } } private static interface RootInterface2 { public default int test2() { return 2; } } private static class C1 implements RootInterface1, RootInterface2 {} private static class C2 implements RootInterface1, RootInterface2 {} private static class C3 implements RootInterface1, RootInterface2 {} enum E {A, B, C;} private void throwException() { throw new RuntimeException(); } private static final class ResultException extends RuntimeException { public final boolean result; public ResultException(boolean result) { this.result = result; } } }