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8308753: Class-File API transition to Preview

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Reviewed-by: ihse, mchung, vromero
This commit is contained in:
Adam Sotona 2023-12-04 07:07:57 +00:00
parent b9df827adc
commit 2b00ac0d02
681 changed files with 7518 additions and 6502 deletions
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src/java.base/share/classes/java/lang/classfile/components/CodeLocalsShifter.java Normal file
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/*
* Copyright (c) 2022, 2023, 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.classfile.components;
import java.lang.constant.MethodTypeDesc;
import java.lang.reflect.AccessFlag;
import java.lang.classfile.AccessFlags;
import java.lang.classfile.CodeTransform;
import java.lang.classfile.TypeKind;
import jdk.internal.classfile.impl.CodeLocalsShifterImpl;
import jdk.internal.javac.PreviewFeature;
/**
* {@link CodeLocalsShifter} is a {@link CodeTransform} shifting locals to
* newly allocated positions to avoid conflicts during code injection.
* Locals pointing to the receiver or to method arguments slots are never shifted.
* All locals pointing beyond the method arguments are re-indexed in order of appearance.
*
* @since 22
*/
@PreviewFeature(feature = PreviewFeature.Feature.CLASSFILE_API)
public sealed interface CodeLocalsShifter extends CodeTransform permits CodeLocalsShifterImpl {
/**
* Creates a new instance of {@link CodeLocalsShifter}
* with fixed local slots calculated from provided method information.
* @param methodFlags flags of the method to construct {@link CodeLocalsShifter} for
* @param methodDescriptor descriptor of the method to construct {@link CodeLocalsShifter} for
* @return new instance of {@link CodeLocalsShifter}
*/
static CodeLocalsShifter of(AccessFlags methodFlags, MethodTypeDesc methodDescriptor) {
int fixed = methodFlags.has(AccessFlag.STATIC) ? 0 : 1;
for (var param : methodDescriptor.parameterList())
fixed += TypeKind.from(param).slotSize();
return new CodeLocalsShifterImpl(fixed);
}
}