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68 lines
2.7 KiB
Java
68 lines
2.7 KiB
Java
/*
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* Copyright (c) 2022, 2025, 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.classfile.constantpool;
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import java.lang.classfile.CodeBuilder;
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import java.lang.classfile.Opcode;
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import java.lang.classfile.TypeKind;
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import java.lang.classfile.instruction.ConstantInstruction;
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import java.lang.constant.ConstantDesc;
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/**
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* Marker interface for constant pool entries suitable for loading via the
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* {@link ConstantInstruction.LoadConstantInstruction ldc} instructions.
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* <p>
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* The use of a {@code LoadableConstantEntry} is modeled by a {@link ConstantDesc}.
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* Conversions are through {@link ConstantPoolBuilder#loadableConstantEntry(ConstantDesc)}
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* and {@link #constantValue()}.
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*
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* @see CodeBuilder#ldc(LoadableConstantEntry)
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* @jvms 4.4 The Constant Pool
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* @sealedGraph
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* @since 24
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*/
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public sealed interface LoadableConstantEntry extends PoolEntry
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permits ClassEntry, ConstantDynamicEntry, ConstantValueEntry, MethodHandleEntry, MethodTypeEntry {
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/**
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* {@return a symbolic descriptor of this constant}
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*
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* @see ConstantPoolBuilder#loadableConstantEntry(ConstantDesc)
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*/
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ConstantDesc constantValue();
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/**
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* {@return the data type of this constant}
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* <p>
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* If the data type is of {@linkplain TypeKind#slotSize() category} 2, this
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* constant must be loaded with {@link Opcode#LDC2_W ldc2_w}; otherwise, the
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* data type is of category 1, and this constant must be loaded with {@link
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* Opcode#LDC ldc} or {@link Opcode#LDC_W ldc_w}.
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*/
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default TypeKind typeKind() {
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return TypeKind.REFERENCE;
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}
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}
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