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545 lines
27 KiB
Java
545 lines
27 KiB
Java
/*
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* Copyright (c) 2017, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.runtime;
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import java.lang.Enum.EnumDesc;
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import java.lang.constant.ClassDesc;
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import java.lang.constant.ConstantDescs;
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import java.lang.constant.MethodTypeDesc;
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import java.lang.invoke.CallSite;
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import java.lang.invoke.ConstantCallSite;
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodType;
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import java.lang.reflect.AccessFlag;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.function.BiPredicate;
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import java.util.stream.Stream;
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import jdk.internal.access.SharedSecrets;
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import jdk.internal.classfile.Classfile;
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import jdk.internal.classfile.Label;
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import jdk.internal.classfile.instruction.SwitchCase;
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import jdk.internal.vm.annotation.Stable;
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import static java.lang.invoke.MethodHandles.Lookup.ClassOption.NESTMATE;
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import static java.lang.invoke.MethodHandles.Lookup.ClassOption.STRONG;
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import static java.util.Objects.requireNonNull;
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/**
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* Bootstrap methods for linking {@code invokedynamic} call sites that implement
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* the selection functionality of the {@code switch} statement. The bootstraps
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* take additional static arguments corresponding to the {@code case} labels
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* of the {@code switch}, implicitly numbered sequentially from {@code [0..N)}.
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*
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* @since 21
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*/
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public class SwitchBootstraps {
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private SwitchBootstraps() {}
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private static final Object SENTINEL = new Object();
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private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
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private static final MethodHandle NULL_CHECK;
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private static final MethodHandle IS_ZERO;
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private static final MethodHandle CHECK_INDEX;
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private static final MethodHandle MAPPED_ENUM_LOOKUP;
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private static final MethodTypeDesc TYPES_SWITCH_DESCRIPTOR =
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MethodTypeDesc.ofDescriptor("(Ljava/lang/Object;ILjava/util/function/BiPredicate;Ljava/util/List;)I");
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static {
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try {
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NULL_CHECK = LOOKUP.findStatic(Objects.class, "isNull",
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MethodType.methodType(boolean.class, Object.class));
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IS_ZERO = LOOKUP.findStatic(SwitchBootstraps.class, "isZero",
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MethodType.methodType(boolean.class, int.class));
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CHECK_INDEX = LOOKUP.findStatic(Objects.class, "checkIndex",
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MethodType.methodType(int.class, int.class, int.class));
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MAPPED_ENUM_LOOKUP = LOOKUP.findStatic(SwitchBootstraps.class, "mappedEnumLookup",
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MethodType.methodType(int.class, Enum.class, MethodHandles.Lookup.class,
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Class.class, EnumDesc[].class, EnumMap.class));
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}
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catch (ReflectiveOperationException e) {
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throw new ExceptionInInitializerError(e);
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}
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}
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/**
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* Bootstrap method for linking an {@code invokedynamic} call site that
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* implements a {@code switch} on a target of a reference type. The static
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* arguments are an array of case labels which must be non-null and of type
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* {@code String} or {@code Integer} or {@code Class} or {@code EnumDesc}.
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* <p>
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* The type of the returned {@code CallSite}'s method handle will have
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* a return type of {@code int}. It has two parameters: the first argument
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* will be an {@code Object} instance ({@code target}) and the second
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* will be {@code int} ({@code restart}).
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* <p>
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* If the {@code target} is {@code null}, then the method of the call site
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* returns {@literal -1}.
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* <p>
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* If the {@code target} is not {@code null}, then the method of the call site
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* returns the index of the first element in the {@code labels} array starting from
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* the {@code restart} index matching one of the following conditions:
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* <ul>
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* <li>the element is of type {@code Class} that is assignable
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* from the target's class; or</li>
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* <li>the element is of type {@code String} or {@code Integer} and
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* equals to the target.</li>
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* <li>the element is of type {@code EnumDesc}, that describes a constant that is
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* equals to the target.</li>
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* </ul>
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* <p>
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* If no element in the {@code labels} array matches the target, then
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* the method of the call site return the length of the {@code labels} array.
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* <p>
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* The value of the {@code restart} index must be between {@code 0} (inclusive) and
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* the length of the {@code labels} array (inclusive),
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* both or an {@link IndexOutOfBoundsException} is thrown.
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*
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* @param lookup Represents a lookup context with the accessibility
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* privileges of the caller. When used with {@code invokedynamic},
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* this is stacked automatically by the VM.
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* @param invocationName unused
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* @param invocationType The invocation type of the {@code CallSite} with two parameters,
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* a reference type, an {@code int}, and {@code int} as a return type.
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* @param labels case labels - {@code String} and {@code Integer} constants
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* and {@code Class} and {@code EnumDesc} instances, in any combination
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* @return a {@code CallSite} returning the first matching element as described above
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*
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* @throws NullPointerException if any argument is {@code null}
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* @throws IllegalArgumentException if any element in the labels array is null, if the
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* invocation type is not not a method type of first parameter of a reference type,
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* second parameter of type {@code int} and with {@code int} as its return type,
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* or if {@code labels} contains an element that is not of type {@code String},
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* {@code Integer}, {@code Class} or {@code EnumDesc}.
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* @jvms 4.4.6 The CONSTANT_NameAndType_info Structure
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* @jvms 4.4.10 The CONSTANT_Dynamic_info and CONSTANT_InvokeDynamic_info Structures
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*/
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public static CallSite typeSwitch(MethodHandles.Lookup lookup,
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String invocationName,
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MethodType invocationType,
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Object... labels) {
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if (invocationType.parameterCount() != 2
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|| (!invocationType.returnType().equals(int.class))
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|| invocationType.parameterType(0).isPrimitive()
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|| !invocationType.parameterType(1).equals(int.class))
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throw new IllegalArgumentException("Illegal invocation type " + invocationType);
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requireNonNull(labels);
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labels = labels.clone();
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Stream.of(labels).forEach(SwitchBootstraps::verifyLabel);
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MethodHandle target = generateInnerClass(lookup, labels);
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target = withIndexCheck(target, labels.length);
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return new ConstantCallSite(target);
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}
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private static void verifyLabel(Object label) {
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if (label == null) {
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throw new IllegalArgumentException("null label found");
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}
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Class<?> labelClass = label.getClass();
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if (labelClass != Class.class &&
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labelClass != String.class &&
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labelClass != Integer.class &&
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labelClass != EnumDesc.class) {
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throw new IllegalArgumentException("label with illegal type found: " + label.getClass());
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}
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}
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private static boolean isZero(int value) {
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return value == 0;
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}
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/**
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* Bootstrap method for linking an {@code invokedynamic} call site that
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* implements a {@code switch} on a target of an enum type. The static
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* arguments are used to encode the case labels associated to the switch
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* construct, where each label can be encoded in two ways:
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* <ul>
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* <li>as a {@code String} value, which represents the name of
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* the enum constant associated with the label</li>
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* <li>as a {@code Class} value, which represents the enum type
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* associated with a type test pattern</li>
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* </ul>
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* <p>
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* The returned {@code CallSite}'s method handle will have
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* a return type of {@code int} and accepts two parameters: the first argument
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* will be an {@code Enum} instance ({@code target}) and the second
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* will be {@code int} ({@code restart}).
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* <p>
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* If the {@code target} is {@code null}, then the method of the call site
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* returns {@literal -1}.
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* <p>
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* If the {@code target} is not {@code null}, then the method of the call site
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* returns the index of the first element in the {@code labels} array starting from
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* the {@code restart} index matching one of the following conditions:
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* <ul>
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* <li>the element is of type {@code Class} that is assignable
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* from the target's class; or</li>
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* <li>the element is of type {@code String} and equals to the target
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* enum constant's {@link Enum#name()}.</li>
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* </ul>
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* <p>
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* If no element in the {@code labels} array matches the target, then
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* the method of the call site return the length of the {@code labels} array.
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* <p>
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* The value of the {@code restart} index must be between {@code 0} (inclusive) and
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* the length of the {@code labels} array (inclusive),
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* both or an {@link IndexOutOfBoundsException} is thrown.
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*
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* @param lookup Represents a lookup context with the accessibility
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* privileges of the caller. When used with {@code invokedynamic},
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* this is stacked automatically by the VM.
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* @param invocationName unused
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* @param invocationType The invocation type of the {@code CallSite} with two parameters,
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* an enum type, an {@code int}, and {@code int} as a return type.
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* @param labels case labels - {@code String} constants and {@code Class} instances,
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* in any combination
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* @return a {@code CallSite} returning the first matching element as described above
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*
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* @throws NullPointerException if any argument is {@code null}
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* @throws IllegalArgumentException if any element in the labels array is null, if the
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* invocation type is not a method type whose first parameter type is an enum type,
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* second parameter of type {@code int} and whose return type is {@code int},
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* or if {@code labels} contains an element that is not of type {@code String} or
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* {@code Class} of the target enum type.
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* @jvms 4.4.6 The CONSTANT_NameAndType_info Structure
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* @jvms 4.4.10 The CONSTANT_Dynamic_info and CONSTANT_InvokeDynamic_info Structures
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*/
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public static CallSite enumSwitch(MethodHandles.Lookup lookup,
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String invocationName,
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MethodType invocationType,
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Object... labels) {
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if (invocationType.parameterCount() != 2
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|| (!invocationType.returnType().equals(int.class))
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|| invocationType.parameterType(0).isPrimitive()
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|| !invocationType.parameterType(0).isEnum()
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|| !invocationType.parameterType(1).equals(int.class))
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throw new IllegalArgumentException("Illegal invocation type " + invocationType);
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requireNonNull(labels);
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labels = labels.clone();
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Class<?> enumClass = invocationType.parameterType(0);
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labels = Stream.of(labels).map(l -> convertEnumConstants(lookup, enumClass, l)).toArray();
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MethodHandle target;
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boolean constantsOnly = Stream.of(labels).allMatch(l -> enumClass.isAssignableFrom(EnumDesc.class));
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if (labels.length > 0 && constantsOnly) {
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//If all labels are enum constants, construct an optimized handle for repeat index 0:
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//if (selector == null) return -1
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//else if (idx == 0) return mappingArray[selector.ordinal()]; //mapping array created lazily
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//else return "typeSwitch(labels)"
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MethodHandle body =
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MethodHandles.guardWithTest(MethodHandles.dropArguments(NULL_CHECK, 0, int.class),
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MethodHandles.dropArguments(MethodHandles.constant(int.class, -1), 0, int.class, Object.class),
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MethodHandles.guardWithTest(MethodHandles.dropArguments(IS_ZERO, 1, Object.class),
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generateInnerClass(lookup, labels),
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MethodHandles.insertArguments(MAPPED_ENUM_LOOKUP, 1, lookup, enumClass, labels, new EnumMap())));
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target = MethodHandles.permuteArguments(body, MethodType.methodType(int.class, Object.class, int.class), 1, 0);
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} else {
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target = generateInnerClass(lookup, labels);
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}
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target = target.asType(invocationType);
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target = withIndexCheck(target, labels.length);
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return new ConstantCallSite(target);
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}
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private static <E extends Enum<E>> Object convertEnumConstants(MethodHandles.Lookup lookup, Class<?> enumClassTemplate, Object label) {
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if (label == null) {
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throw new IllegalArgumentException("null label found");
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}
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Class<?> labelClass = label.getClass();
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if (labelClass == Class.class) {
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if (label != enumClassTemplate) {
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throw new IllegalArgumentException("the Class label: " + label +
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", expected the provided enum class: " + enumClassTemplate);
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}
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return label;
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} else if (labelClass == String.class) {
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return EnumDesc.of(enumClassTemplate.describeConstable().orElseThrow(), (String) label);
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} else {
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throw new IllegalArgumentException("label with illegal type found: " + labelClass +
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", expected label of type either String or Class");
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}
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}
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private static <T extends Enum<T>> int mappedEnumLookup(T value, MethodHandles.Lookup lookup, Class<T> enumClass, EnumDesc<?>[] labels, EnumMap enumMap) {
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if (enumMap.map == null) {
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T[] constants = SharedSecrets.getJavaLangAccess().getEnumConstantsShared(enumClass);
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int[] map = new int[constants.length];
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int ordinal = 0;
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for (T constant : constants) {
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map[ordinal] = labels.length;
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for (int i = 0; i < labels.length; i++) {
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if (Objects.equals(labels[i].constantName(), constant.name())) {
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map[ordinal] = i;
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break;
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}
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}
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ordinal++;
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}
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}
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return enumMap.map[value.ordinal()];
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}
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private static MethodHandle withIndexCheck(MethodHandle target, int labelsCount) {
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MethodHandle checkIndex = MethodHandles.insertArguments(CHECK_INDEX, 1, labelsCount + 1);
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return MethodHandles.filterArguments(target, 1, checkIndex);
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}
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private static final class ResolvedEnumLabels implements BiPredicate<Integer, Object> {
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private final MethodHandles.Lookup lookup;
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private final EnumDesc<?>[] enumDescs;
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@Stable
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private Object[] resolvedEnum;
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public ResolvedEnumLabels(MethodHandles.Lookup lookup, EnumDesc<?>[] enumDescs) {
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this.lookup = lookup;
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this.enumDescs = enumDescs;
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this.resolvedEnum = new Object[enumDescs.length];
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}
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@Override
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public boolean test(Integer labelIndex, Object value) {
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Object result = resolvedEnum[labelIndex];
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if (result == null) {
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try {
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if (!(value instanceof Enum<?> enumValue)) {
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return false;
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}
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EnumDesc<?> label = enumDescs[labelIndex];
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Class<?> clazz = label.constantType().resolveConstantDesc(lookup);
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if (enumValue.getDeclaringClass() != clazz) {
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return false;
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}
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result = label.resolveConstantDesc(lookup);
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} catch (IllegalArgumentException | ReflectiveOperationException ex) {
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result = SENTINEL;
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}
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resolvedEnum[labelIndex] = result;
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}
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return result == value;
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}
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}
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private static final class EnumMap {
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@Stable
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public int[] map;
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}
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/*
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* Construct test chains for labels inside switch, to handle switch repeats:
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* switch (idx) {
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* case 0 -> if (selector matches label[0]) return 0;
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* case 1 -> if (selector matches label[1]) return 1;
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* ...
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* }
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*/
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@SuppressWarnings("removal")
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private static MethodHandle generateInnerClass(MethodHandles.Lookup caller, Object[] labels) {
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List<EnumDesc<?>> enumDescs = new ArrayList<>();
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List<Class<?>> extraClassLabels = new ArrayList<>();
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byte[] classBytes = Classfile.of().build(ClassDesc.of(typeSwitchClassName(caller.lookupClass())), clb -> {
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clb.withFlags(AccessFlag.FINAL, AccessFlag.SUPER, AccessFlag.SYNTHETIC)
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.withMethodBody("typeSwitch",
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TYPES_SWITCH_DESCRIPTOR,
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Classfile.ACC_FINAL | Classfile.ACC_PUBLIC | Classfile.ACC_STATIC,
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cb -> {
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cb.aload(0);
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Label nonNullLabel = cb.newLabel();
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cb.if_nonnull(nonNullLabel);
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cb.iconst_m1();
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cb.ireturn();
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cb.labelBinding(nonNullLabel);
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if (labels.length == 0) {
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cb.constantInstruction(0)
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.ireturn();
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return ;
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}
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cb.iload(1);
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Label dflt = cb.newLabel();
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record Element(Label target, Label next, Object caseLabel) {}
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List<Element> cases = new ArrayList<>();
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List<SwitchCase> switchCases = new ArrayList<>();
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Object lastLabel = null;
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for (int idx = labels.length - 1; idx >= 0; idx--) {
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Object currentLabel = labels[idx];
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Label target = cb.newLabel();
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Label next;
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if (lastLabel == null) {
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next = dflt;
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} else if (lastLabel.equals(currentLabel)) {
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next = cases.getLast().next();
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} else {
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next = cases.getLast().target();
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}
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lastLabel = currentLabel;
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cases.add(new Element(target, next, currentLabel));
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switchCases.add(SwitchCase.of(idx, target));
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}
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cases = cases.reversed();
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switchCases = switchCases.reversed();
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cb.tableswitch(0, labels.length - 1, dflt, switchCases);
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for (int idx = 0; idx < cases.size(); idx++) {
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Element element = cases.get(idx);
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Label next = element.next();
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cb.labelBinding(element.target());
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if (element.caseLabel() instanceof Class<?> classLabel) {
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Optional<ClassDesc> classLabelConstableOpt = classLabel.describeConstable();
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if (classLabelConstableOpt.isPresent()) {
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cb.aload(0);
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cb.instanceof_(classLabelConstableOpt.orElseThrow());
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cb.ifeq(next);
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} else {
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cb.aload(3);
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cb.constantInstruction(extraClassLabels.size());
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cb.invokeinterface(ConstantDescs.CD_List,
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"get",
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MethodTypeDesc.of(ConstantDescs.CD_Object,
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ConstantDescs.CD_int));
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cb.checkcast(ConstantDescs.CD_Class);
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cb.aload(0);
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cb.invokevirtual(ConstantDescs.CD_Class,
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"isInstance",
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MethodTypeDesc.of(ConstantDescs.CD_boolean,
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ConstantDescs.CD_Object));
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cb.ifeq(next);
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extraClassLabels.add(classLabel);
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}
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} else if (element.caseLabel() instanceof EnumDesc<?> enumLabel) {
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int enumIdx = enumDescs.size();
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enumDescs.add(enumLabel);
|
|
cb.aload(2);
|
|
cb.constantInstruction(enumIdx);
|
|
cb.invokestatic(ConstantDescs.CD_Integer,
|
|
"valueOf",
|
|
MethodTypeDesc.of(ConstantDescs.CD_Integer,
|
|
ConstantDescs.CD_int));
|
|
cb.aload(0);
|
|
cb.invokeinterface(BiPredicate.class.describeConstable().orElseThrow(),
|
|
"test",
|
|
MethodTypeDesc.of(ConstantDescs.CD_boolean,
|
|
ConstantDescs.CD_Object,
|
|
ConstantDescs.CD_Object));
|
|
cb.ifeq(next);
|
|
} else if (element.caseLabel() instanceof String stringLabel) {
|
|
cb.ldc(stringLabel);
|
|
cb.aload(0);
|
|
cb.invokevirtual(ConstantDescs.CD_Object,
|
|
"equals",
|
|
MethodTypeDesc.of(ConstantDescs.CD_boolean,
|
|
ConstantDescs.CD_Object));
|
|
cb.ifeq(next);
|
|
} else if (element.caseLabel() instanceof Integer integerLabel) {
|
|
Label compare = cb.newLabel();
|
|
Label notNumber = cb.newLabel();
|
|
cb.aload(0);
|
|
cb.instanceof_(ConstantDescs.CD_Number);
|
|
cb.ifeq(notNumber);
|
|
cb.aload(0);
|
|
cb.checkcast(ConstantDescs.CD_Number);
|
|
cb.invokevirtual(ConstantDescs.CD_Number,
|
|
"intValue",
|
|
MethodTypeDesc.of(ConstantDescs.CD_int));
|
|
cb.goto_(compare);
|
|
cb.labelBinding(notNumber);
|
|
cb.aload(0);
|
|
cb.instanceof_(ConstantDescs.CD_Character);
|
|
cb.ifeq(next);
|
|
cb.aload(0);
|
|
cb.checkcast(ConstantDescs.CD_Character);
|
|
cb.invokevirtual(ConstantDescs.CD_Character,
|
|
"charValue",
|
|
MethodTypeDesc.of(ConstantDescs.CD_char));
|
|
cb.labelBinding(compare);
|
|
cb.ldc(integerLabel);
|
|
cb.if_icmpne(next);
|
|
} else {
|
|
throw new InternalError("Unsupported label type: " +
|
|
element.caseLabel().getClass());
|
|
}
|
|
cb.constantInstruction(idx);
|
|
cb.ireturn();
|
|
}
|
|
cb.labelBinding(dflt);
|
|
cb.constantInstruction(cases.size());
|
|
cb.ireturn();
|
|
});
|
|
});
|
|
|
|
try {
|
|
// this class is linked at the indy callsite; so define a hidden nestmate
|
|
MethodHandles.Lookup lookup;
|
|
lookup = caller.defineHiddenClass(classBytes, true, NESTMATE, STRONG);
|
|
MethodHandle typeSwitch = lookup.findStatic(lookup.lookupClass(),
|
|
"typeSwitch",
|
|
MethodType.methodType(int.class,
|
|
Object.class,
|
|
int.class,
|
|
BiPredicate.class,
|
|
List.class));
|
|
return MethodHandles.insertArguments(typeSwitch, 2, new ResolvedEnumLabels(caller, enumDescs.toArray(EnumDesc[]::new)),
|
|
List.copyOf(extraClassLabels));
|
|
} catch (Throwable t) {
|
|
throw new IllegalArgumentException(t);
|
|
}
|
|
}
|
|
|
|
//based on src/java.base/share/classes/java/lang/invoke/InnerClassLambdaMetafactory.java:
|
|
private static String typeSwitchClassName(Class<?> targetClass) {
|
|
String name = targetClass.getName();
|
|
if (targetClass.isHidden()) {
|
|
// use the original class name
|
|
name = name.replace('/', '_');
|
|
}
|
|
return name + "$$TypeSwitch";
|
|
}
|
|
}
|