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122 lines
3.9 KiB
Java
122 lines
3.9 KiB
Java
/*
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* Copyright (c) 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 jdk.internal.classfile.attribute;
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import java.lang.constant.ClassDesc;
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import java.util.List;
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import jdk.internal.classfile.Label;
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import jdk.internal.classfile.constantpool.ClassEntry;
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import jdk.internal.classfile.impl.StackMapDecoder;
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import jdk.internal.classfile.impl.TemporaryConstantPool;
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import static jdk.internal.classfile.Classfile.*;
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/**
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* Models stack map frame of {@code StackMapTable} attribute {@jvms 4.7.4}.
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*/
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public sealed interface StackMapFrameInfo
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permits StackMapDecoder.StackMapFrameImpl {
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int frameType();
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Label target();
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List<VerificationTypeInfo> locals();
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List<VerificationTypeInfo> stack();
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public static StackMapFrameInfo of(Label target,
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List<VerificationTypeInfo> locals,
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List<VerificationTypeInfo> stack) {
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return new StackMapDecoder.StackMapFrameImpl(255, target, locals, stack);
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}
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/**
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* The type of a stack value.
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*/
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sealed interface VerificationTypeInfo {
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int tag();
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}
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/**
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* A simple stack value.
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*/
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public enum SimpleVerificationTypeInfo implements VerificationTypeInfo {
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ITEM_TOP(VT_TOP),
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ITEM_INTEGER(VT_INTEGER),
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ITEM_FLOAT(VT_FLOAT),
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ITEM_DOUBLE(VT_DOUBLE),
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ITEM_LONG(VT_LONG),
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ITEM_NULL(VT_NULL),
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ITEM_UNINITIALIZED_THIS(VT_UNINITIALIZED_THIS);
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private final int tag;
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SimpleVerificationTypeInfo(int tag) {
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this.tag = tag;
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}
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@Override
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public int tag() {
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return tag;
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}
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}
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/**
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* A stack value for an object type.
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*/
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sealed interface ObjectVerificationTypeInfo extends VerificationTypeInfo
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permits StackMapDecoder.ObjectVerificationTypeInfoImpl {
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public static ObjectVerificationTypeInfo of(ClassEntry className) {
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return new StackMapDecoder.ObjectVerificationTypeInfoImpl(className);
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}
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public static ObjectVerificationTypeInfo of(ClassDesc classDesc) {
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return of(TemporaryConstantPool.INSTANCE.classEntry(classDesc));
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}
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/**
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* {@return the class of the value}
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*/
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ClassEntry className();
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default ClassDesc classSymbol() {
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return className().asSymbol();
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}
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}
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/**
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* An uninitialized stack value.
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*/
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sealed interface UninitializedVerificationTypeInfo extends VerificationTypeInfo
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permits StackMapDecoder.UninitializedVerificationTypeInfoImpl {
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Label newTarget();
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public static UninitializedVerificationTypeInfo of(Label newTarget) {
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return new StackMapDecoder.UninitializedVerificationTypeInfoImpl(newTarget);
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}
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}
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}
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