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60 lines
2.7 KiB
Java
60 lines
2.7 KiB
Java
/*
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* Copyright (c) 2022, 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.classfile.components;
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import java.lang.classfile.AccessFlags;
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import java.lang.classfile.CodeTransform;
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import java.lang.classfile.TypeKind;
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import java.lang.constant.MethodTypeDesc;
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import java.lang.reflect.AccessFlag;
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import jdk.internal.classfile.impl.CodeLocalsShifterImpl;
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import jdk.internal.javac.PreviewFeature;
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/**
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* {@link CodeLocalsShifter} is a {@link CodeTransform} shifting locals to
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* newly allocated positions to avoid conflicts during code injection.
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* Locals pointing to the receiver or to method arguments slots are never shifted.
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* All locals pointing beyond the method arguments are re-indexed in order of appearance.
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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 CodeLocalsShifter extends CodeTransform permits CodeLocalsShifterImpl {
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/**
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* Creates a new instance of {@link CodeLocalsShifter}
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* with fixed local slots calculated from provided method information.
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* @param methodFlags flags of the method to construct {@link CodeLocalsShifter} for
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* @param methodDescriptor descriptor of the method to construct {@link CodeLocalsShifter} for
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* @return new instance of {@link CodeLocalsShifter}
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*/
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static CodeLocalsShifter of(AccessFlags methodFlags, MethodTypeDesc methodDescriptor) {
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int fixed = methodFlags.has(AccessFlag.STATIC) ? 0 : 1;
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for (var param : methodDescriptor.parameterList())
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fixed += TypeKind.from(param).slotSize();
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return new CodeLocalsShifterImpl(fixed);
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}
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}
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