/* |
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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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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file: |
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* |
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* ASM: a very small and fast Java bytecode manipulation framework |
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* Copyright (c) 2000-2011 INRIA, France Telecom |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the copyright holders nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
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* THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.org.objectweb.asm; |
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/** |
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* An entry of the constant pool, of the BootstrapMethods attribute, or of the (ASM specific) type |
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* table of a class. |
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* |
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* @see <a href="https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.4">JVMS |
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* 4.4</a> |
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* @see <a href="https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.7.23">JVMS |
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* 4.7.23</a> |
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* @author Eric Bruneton |
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*/ |
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abstract class Symbol { |
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// Tag values for the constant pool entries (using the same order as in the JVMS). |
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/** The tag value of CONSTANT_Class_info JVMS structures. */ |
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static final int CONSTANT_CLASS_TAG = 7; |
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/** The tag value of CONSTANT_Fieldref_info JVMS structures. */ |
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static final int CONSTANT_FIELDREF_TAG = 9; |
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/** The tag value of CONSTANT_Methodref_info JVMS structures. */ |
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static final int CONSTANT_METHODREF_TAG = 10; |
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/** The tag value of CONSTANT_InterfaceMethodref_info JVMS structures. */ |
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static final int CONSTANT_INTERFACE_METHODREF_TAG = 11; |
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/** The tag value of CONSTANT_String_info JVMS structures. */ |
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static final int CONSTANT_STRING_TAG = 8; |
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/** The tag value of CONSTANT_Integer_info JVMS structures. */ |
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static final int CONSTANT_INTEGER_TAG = 3; |
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/** The tag value of CONSTANT_Float_info JVMS structures. */ |
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static final int CONSTANT_FLOAT_TAG = 4; |
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/** The tag value of CONSTANT_Long_info JVMS structures. */ |
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static final int CONSTANT_LONG_TAG = 5; |
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/** The tag value of CONSTANT_Double_info JVMS structures. */ |
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static final int CONSTANT_DOUBLE_TAG = 6; |
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/** The tag value of CONSTANT_NameAndType_info JVMS structures. */ |
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static final int CONSTANT_NAME_AND_TYPE_TAG = 12; |
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/** The tag value of CONSTANT_Utf8_info JVMS structures. */ |
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static final int CONSTANT_UTF8_TAG = 1; |
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/** The tag value of CONSTANT_MethodHandle_info JVMS structures. */ |
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static final int CONSTANT_METHOD_HANDLE_TAG = 15; |
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/** The tag value of CONSTANT_MethodType_info JVMS structures. */ |
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static final int CONSTANT_METHOD_TYPE_TAG = 16; |
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/** The tag value of CONSTANT_Dynamic_info JVMS structures. */ |
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static final int CONSTANT_DYNAMIC_TAG = 17; |
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/** The tag value of CONSTANT_InvokeDynamic_info JVMS structures. */ |
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static final int CONSTANT_INVOKE_DYNAMIC_TAG = 18; |
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/** The tag value of CONSTANT_Module_info JVMS structures. */ |
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static final int CONSTANT_MODULE_TAG = 19; |
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/** The tag value of CONSTANT_Package_info JVMS structures. */ |
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static final int CONSTANT_PACKAGE_TAG = 20; |
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// Tag values for the BootstrapMethods attribute entries (ASM specific tag). |
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/** The tag value of the BootstrapMethods attribute entries. */ |
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static final int BOOTSTRAP_METHOD_TAG = 64; |
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// Tag values for the type table entries (ASM specific tags). |
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/** The tag value of a normal type entry in the (ASM specific) type table of a class. */ |
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static final int TYPE_TAG = 128; |
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/** |
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* The tag value of an {@link Frame#ITEM_UNINITIALIZED} type entry in the type table of a class. |
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*/ |
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static final int UNINITIALIZED_TYPE_TAG = 129; |
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/** The tag value of a merged type entry in the (ASM specific) type table of a class. */ |
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static final int MERGED_TYPE_TAG = 130; |
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// Instance fields. |
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/** |
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* The index of this symbol in the constant pool, in the BootstrapMethods attribute, or in the |
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* (ASM specific) type table of a class (depending on the {@link #tag} value). |
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*/ |
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final int index; |
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/** |
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* A tag indicating the type of this symbol. Must be one of the static tag values defined in this |
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* class. |
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*/ |
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final int tag; |
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/** |
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* The internal name of the owner class of this symbol. Only used for {@link |
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* #CONSTANT_FIELDREF_TAG}, {@link #CONSTANT_METHODREF_TAG}, {@link |
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* #CONSTANT_INTERFACE_METHODREF_TAG}, and {@link #CONSTANT_METHOD_HANDLE_TAG} symbols. |
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*/ |
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final String owner; |
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/** |
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* The name of the class field or method corresponding to this symbol. Only used for {@link |
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* #CONSTANT_FIELDREF_TAG}, {@link #CONSTANT_METHODREF_TAG}, {@link |
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* #CONSTANT_INTERFACE_METHODREF_TAG}, {@link #CONSTANT_NAME_AND_TYPE_TAG}, {@link |
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* #CONSTANT_METHOD_HANDLE_TAG}, {@link #CONSTANT_DYNAMIC_TAG} and {@link |
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* #CONSTANT_INVOKE_DYNAMIC_TAG} symbols. |
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*/ |
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final String name; |
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/** |
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* The string value of this symbol. This is: |
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* |
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* <ul> |
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* <li>a field or method descriptor for {@link #CONSTANT_FIELDREF_TAG}, {@link |
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* #CONSTANT_METHODREF_TAG}, {@link #CONSTANT_INTERFACE_METHODREF_TAG}, {@link |
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* #CONSTANT_NAME_AND_TYPE_TAG}, {@link #CONSTANT_METHOD_HANDLE_TAG}, {@link |
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* #CONSTANT_METHOD_TYPE_TAG}, {@link #CONSTANT_DYNAMIC_TAG} and {@link |
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* #CONSTANT_INVOKE_DYNAMIC_TAG} symbols, |
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* <li>an arbitrary string for {@link #CONSTANT_UTF8_TAG} and {@link #CONSTANT_STRING_TAG} |
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* symbols, |
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* <li>an internal class name for {@link #CONSTANT_CLASS_TAG}, {@link #TYPE_TAG} and {@link |
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* #UNINITIALIZED_TYPE_TAG} symbols, |
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* <li>{@literal null} for the other types of symbol. |
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* </ul> |
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*/ |
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final String value; |
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/** |
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* The numeric value of this symbol. This is: |
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* |
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* <ul> |
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* <li>the symbol's value for {@link #CONSTANT_INTEGER_TAG},{@link #CONSTANT_FLOAT_TAG}, {@link |
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* #CONSTANT_LONG_TAG}, {@link #CONSTANT_DOUBLE_TAG}, |
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* <li>the CONSTANT_MethodHandle_info reference_kind field value for {@link |
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* #CONSTANT_METHOD_HANDLE_TAG} symbols, |
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* <li>the CONSTANT_InvokeDynamic_info bootstrap_method_attr_index field value for {@link |
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* #CONSTANT_INVOKE_DYNAMIC_TAG} symbols, |
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* <li>the offset of a bootstrap method in the BootstrapMethods boostrap_methods array, for |
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* {@link #CONSTANT_DYNAMIC_TAG} or {@link #BOOTSTRAP_METHOD_TAG} symbols, |
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* <li>the bytecode offset of the NEW instruction that created an {@link |
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* Frame#ITEM_UNINITIALIZED} type for {@link #UNINITIALIZED_TYPE_TAG} symbols, |
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* <li>the indices (in the class' type table) of two {@link #TYPE_TAG} source types for {@link |
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* #MERGED_TYPE_TAG} symbols, |
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* <li>0 for the other types of symbol. |
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* </ul> |
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*/ |
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final long data; |
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/** |
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* Additional information about this symbol, generally computed lazily. <i>Warning: the value of |
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* this field is ignored when comparing Symbol instances</i> (to avoid duplicate entries in a |
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* SymbolTable). Therefore, this field should only contain data that can be computed from the |
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* other fields of this class. It contains: |
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* |
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* <ul> |
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* <li>the {@link Type#getArgumentsAndReturnSizes} of the symbol's method descriptor for {@link |
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* #CONSTANT_METHODREF_TAG}, {@link #CONSTANT_INTERFACE_METHODREF_TAG} and {@link |
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* #CONSTANT_INVOKE_DYNAMIC_TAG} symbols, |
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* <li>the index in the InnerClasses_attribute 'classes' array (plus one) corresponding to this |
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* class, for {@link #CONSTANT_CLASS_TAG} symbols, |
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* <li>the index (in the class' type table) of the merged type of the two source types for |
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* {@link #MERGED_TYPE_TAG} symbols, |
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* <li>0 for the other types of symbol, or if this field has not been computed yet. |
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* </ul> |
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*/ |
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int info; |
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/** |
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* Constructs a new Symbol. This constructor can't be used directly because the Symbol class is |
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* abstract. Instead, use the factory methods of the {@link SymbolTable} class. |
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* |
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* @param index the symbol index in the constant pool, in the BootstrapMethods attribute, or in |
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* the (ASM specific) type table of a class (depending on 'tag'). |
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* @param tag the symbol type. Must be one of the static tag values defined in this class. |
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* @param owner The internal name of the symbol's owner class. Maybe {@literal null}. |
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* @param name The name of the symbol's corresponding class field or method. Maybe {@literal |
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* null}. |
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* @param value The string value of this symbol. Maybe {@literal null}. |
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* @param data The numeric value of this symbol. |
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*/ |
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Symbol( |
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final int index, |
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final int tag, |
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final String owner, |
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final String name, |
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final String value, |
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final long data) { |
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this.index = index; |
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this.tag = tag; |
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this.owner = owner; |
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this.name = name; |
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this.value = value; |
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this.data = data; |
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} |
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/** |
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* Returns the result {@link Type#getArgumentsAndReturnSizes} on {@link #value}. |
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* |
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* @return the result {@link Type#getArgumentsAndReturnSizes} on {@link #value} (memoized in |
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* {@link #info} for efficiency). This should only be used for {@link |
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* #CONSTANT_METHODREF_TAG}, {@link #CONSTANT_INTERFACE_METHODREF_TAG} and {@link |
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* #CONSTANT_INVOKE_DYNAMIC_TAG} symbols. |
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*/ |
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int getArgumentsAndReturnSizes() { |
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if (info == 0) { |
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info = Type.getArgumentsAndReturnSizes(value); |
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} |
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return info; |
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} |
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} |