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8282274: Compiler implementation for Pattern Matching for switch (Third Preview)

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Co-authored-by: Brian Goetz <briangoetz@openjdk.org>
Co-authored-by: Jan Lahoda <jlahoda@openjdk.org>
Reviewed-by: mcimadamore, vromero, abimpoudis
This commit is contained in:
Jan Lahoda 2022-05-16 07:49:26 +00:00
parent 2d34acfec9
commit 0155e4b76b
53 changed files with 685 additions and 456 deletions
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src/java.base/share/classes/java/lang/MatchException.java Normal file
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/*
* Copyright (c) 2022, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
package java.lang;
import jdk.internal.javac.PreviewFeature;
/**
* Thrown to indicate an unexpected failure in pattern matching.
*
* {@code MatchException} may be thrown when an exhaustive pattern matching language construct
* (such as a switch expression) encounters a value that does not match any of the provided
* patterns at runtime. This can currently arise for separate compilation anomalies,
* where a sealed interface has a different set of permitted subtypes at runtime than
* it had at compilation time, an enum has a different set of constants at runtime than
* it had at compilation time, or the type hierarchy has changed in incompatible ways between
* compile time and run time.
*
* @jls 14.11.3 Execution of a switch Statement
* @jls 14.30.2 Pattern Matching
* @jls 15.28.2 Run-Time Evaluation of switch Expressions
*
* @since 19
*/
@PreviewFeature(feature=PreviewFeature.Feature.SWITCH_PATTERN_MATCHING)
public final class MatchException extends RuntimeException {
@java.io.Serial
private static final long serialVersionUID = 0L;
/**
* Constructs an {@code MatchException} with the specified detail message and
* cause.
*
* @param message the detail message (which is saved for later retrieval
* by the {@link #getMessage()} method).
* @param cause the cause (which is saved for later retrieval by the
* {@link #getCause()} method). (A {@code null} value is
* permitted, and indicates that the cause is nonexistent or
* unknown.)
*/
public MatchException(String message, Throwable cause) {
super(message, cause);
}
}