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87 lines
3.5 KiB
Java
87 lines
3.5 KiB
Java
/*
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* Copyright (c) 2022, 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.instruction;
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import java.lang.classfile.CodeElement;
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import java.lang.classfile.CodeModel;
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import java.lang.classfile.Instruction;
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import java.lang.classfile.Opcode;
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import java.lang.classfile.TypeKind;
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import jdk.internal.classfile.impl.AbstractInstruction;
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import jdk.internal.classfile.impl.BytecodeHelpers;
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import jdk.internal.classfile.impl.Util;
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import jdk.internal.javac.PreviewFeature;
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/**
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* Models a local variable load instruction in the {@code code} array of a
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* {@code Code} attribute. Corresponding opcodes will have a {@code kind} of
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* {@link Opcode.Kind#LOAD}. Delivered as a {@link CodeElement} when
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* traversing the elements of a {@link CodeModel}.
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*
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* @since 22
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*/
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@PreviewFeature(feature = PreviewFeature.Feature.CLASSFILE_API)
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public sealed interface LoadInstruction extends Instruction
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permits AbstractInstruction.BoundLoadInstruction,
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AbstractInstruction.UnboundLoadInstruction {
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/**
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* {@return the local variable slot to load from}
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*/
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int slot();
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/**
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* {@return the type of the value to be loaded}
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*/
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TypeKind typeKind();
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/**
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* {@return a local variable load instruction}
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*
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* @param kind the type of the value to be loaded
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* @param slot the local variable slot to load from
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* @throws IllegalArgumentException if {@code kind} is
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* {@link TypeKind#VOID void} or {@code slot} is out of range
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*/
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static LoadInstruction of(TypeKind kind, int slot) {
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var opcode = BytecodeHelpers.loadOpcode(kind, slot); // validates slot, trusted
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return new AbstractInstruction.UnboundLoadInstruction(opcode, slot);
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}
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/**
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* {@return a local variable load instruction}
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*
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* @param op the opcode for the specific type of load instruction,
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* which must be of kind {@link Opcode.Kind#LOAD}
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* @param slot the local variable slot to load from
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* @throws IllegalArgumentException if the opcode kind is not
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* {@link Opcode.Kind#LOAD} or {@code slot} is out of range
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*/
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static LoadInstruction of(Opcode op, int slot) {
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Util.checkKind(op, Opcode.Kind.LOAD);
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BytecodeHelpers.validateSlot(op, slot, true);
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return new AbstractInstruction.UnboundLoadInstruction(op, slot);
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}
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}
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