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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
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 *    this software without specific prior written permission.
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package jdk.internal.org.objectweb.asm;

An entry of the constant pool, of the BootstrapMethods attribute, or of the (ASM specific) type table of a class.
Author:Eric Bruneton
See Also:
/** * An entry of the constant pool, of the BootstrapMethods attribute, or of the (ASM specific) type * table of a class. * * @see <a href="https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.4">JVMS * 4.4</a> * @see <a href="https://docs.oracle.com/javase/specs/jvms/se9/html/jvms-4.html#jvms-4.7.23">JVMS * 4.7.23</a> * @author Eric Bruneton */
abstract class Symbol { // Tag values for the constant pool entries (using the same order as in the JVMS).
The tag value of CONSTANT_Class_info JVMS structures.
/** The tag value of CONSTANT_Class_info JVMS structures. */
static final int CONSTANT_CLASS_TAG = 7;
The tag value of CONSTANT_Fieldref_info JVMS structures.
/** The tag value of CONSTANT_Fieldref_info JVMS structures. */
static final int CONSTANT_FIELDREF_TAG = 9;
The tag value of CONSTANT_Methodref_info JVMS structures.
/** The tag value of CONSTANT_Methodref_info JVMS structures. */
static final int CONSTANT_METHODREF_TAG = 10;
The tag value of CONSTANT_InterfaceMethodref_info JVMS structures.
/** The tag value of CONSTANT_InterfaceMethodref_info JVMS structures. */
static final int CONSTANT_INTERFACE_METHODREF_TAG = 11;
The tag value of CONSTANT_String_info JVMS structures.
/** The tag value of CONSTANT_String_info JVMS structures. */
static final int CONSTANT_STRING_TAG = 8;
The tag value of CONSTANT_Integer_info JVMS structures.
/** The tag value of CONSTANT_Integer_info JVMS structures. */
static final int CONSTANT_INTEGER_TAG = 3;
The tag value of CONSTANT_Float_info JVMS structures.
/** The tag value of CONSTANT_Float_info JVMS structures. */
static final int CONSTANT_FLOAT_TAG = 4;
The tag value of CONSTANT_Long_info JVMS structures.
/** The tag value of CONSTANT_Long_info JVMS structures. */
static final int CONSTANT_LONG_TAG = 5;
The tag value of CONSTANT_Double_info JVMS structures.
/** The tag value of CONSTANT_Double_info JVMS structures. */
static final int CONSTANT_DOUBLE_TAG = 6;
The tag value of CONSTANT_NameAndType_info JVMS structures.
/** The tag value of CONSTANT_NameAndType_info JVMS structures. */
static final int CONSTANT_NAME_AND_TYPE_TAG = 12;
The tag value of CONSTANT_Utf8_info JVMS structures.
/** The tag value of CONSTANT_Utf8_info JVMS structures. */
static final int CONSTANT_UTF8_TAG = 1;
The tag value of CONSTANT_MethodHandle_info JVMS structures.
/** The tag value of CONSTANT_MethodHandle_info JVMS structures. */
static final int CONSTANT_METHOD_HANDLE_TAG = 15;
The tag value of CONSTANT_MethodType_info JVMS structures.
/** The tag value of CONSTANT_MethodType_info JVMS structures. */
static final int CONSTANT_METHOD_TYPE_TAG = 16;
The tag value of CONSTANT_Dynamic_info JVMS structures.
/** The tag value of CONSTANT_Dynamic_info JVMS structures. */
static final int CONSTANT_DYNAMIC_TAG = 17;
The tag value of CONSTANT_InvokeDynamic_info JVMS structures.
/** The tag value of CONSTANT_InvokeDynamic_info JVMS structures. */
static final int CONSTANT_INVOKE_DYNAMIC_TAG = 18;
The tag value of CONSTANT_Module_info JVMS structures.
/** The tag value of CONSTANT_Module_info JVMS structures. */
static final int CONSTANT_MODULE_TAG = 19;
The tag value of CONSTANT_Package_info JVMS structures.
/** The tag value of CONSTANT_Package_info JVMS structures. */
static final int CONSTANT_PACKAGE_TAG = 20; // Tag values for the BootstrapMethods attribute entries (ASM specific tag).
The tag value of the BootstrapMethods attribute entries.
/** The tag value of the BootstrapMethods attribute entries. */
static final int BOOTSTRAP_METHOD_TAG = 64; // Tag values for the type table entries (ASM specific tags).
The tag value of a normal type entry in the (ASM specific) type table of a class.
/** The tag value of a normal type entry in the (ASM specific) type table of a class. */
static final int TYPE_TAG = 128;
The tag value of an Frame.ITEM_UNINITIALIZED type entry in the type table of a class.
/** * The tag value of an {@link Frame#ITEM_UNINITIALIZED} type entry in the type table of a class. */
static final int UNINITIALIZED_TYPE_TAG = 129;
The tag value of a merged type entry in the (ASM specific) type table of a class.
/** The tag value of a merged type entry in the (ASM specific) type table of a class. */
static final int MERGED_TYPE_TAG = 130; // Instance fields.
The index of this symbol in the constant pool, in the BootstrapMethods attribute, or in the (ASM specific) type table of a class (depending on the tag value).
/** * The index of this symbol in the constant pool, in the BootstrapMethods attribute, or in the * (ASM specific) type table of a class (depending on the {@link #tag} value). */
final int index;
A tag indicating the type of this symbol. Must be one of the static tag values defined in this class.
/** * A tag indicating the type of this symbol. Must be one of the static tag values defined in this * class. */
final int tag;
The internal name of the owner class of this symbol. Only used for CONSTANT_FIELDREF_TAG, CONSTANT_METHODREF_TAG, CONSTANT_INTERFACE_METHODREF_TAG, and CONSTANT_METHOD_HANDLE_TAG symbols.
/** * The internal name of the owner class of this symbol. Only used for {@link * #CONSTANT_FIELDREF_TAG}, {@link #CONSTANT_METHODREF_TAG}, {@link * #CONSTANT_INTERFACE_METHODREF_TAG}, and {@link #CONSTANT_METHOD_HANDLE_TAG} symbols. */
final String owner; /** * The name of the class field or method corresponding to this symbol. Only used for {@link * #CONSTANT_FIELDREF_TAG}, {@link #CONSTANT_METHODREF_TAG}, {@link * #CONSTANT_INTERFACE_METHODREF_TAG}, {@link #CONSTANT_NAME_AND_TYPE_TAG}, {@link * #CONSTANT_METHOD_HANDLE_TAG}, {@link #CONSTANT_DYNAMIC_TAG} and {@link * #CONSTANT_INVOKE_DYNAMIC_TAG} symbols. */ final String name;
The string value of this symbol. This is:
/** * The string value of this symbol. This is: * * <ul> * <li>a field or method descriptor for {@link #CONSTANT_FIELDREF_TAG}, {@link * #CONSTANT_METHODREF_TAG}, {@link #CONSTANT_INTERFACE_METHODREF_TAG}, {@link * #CONSTANT_NAME_AND_TYPE_TAG}, {@link #CONSTANT_METHOD_HANDLE_TAG}, {@link * #CONSTANT_METHOD_TYPE_TAG}, {@link #CONSTANT_DYNAMIC_TAG} and {@link * #CONSTANT_INVOKE_DYNAMIC_TAG} symbols, * <li>an arbitrary string for {@link #CONSTANT_UTF8_TAG} and {@link #CONSTANT_STRING_TAG} * symbols, * <li>an internal class name for {@link #CONSTANT_CLASS_TAG}, {@link #TYPE_TAG} and {@link * #UNINITIALIZED_TYPE_TAG} symbols, * <li>{@literal null} for the other types of symbol. * </ul> */
final String value;
The numeric value of this symbol. This is:
/** * The numeric value of this symbol. This is: * * <ul> * <li>the symbol's value for {@link #CONSTANT_INTEGER_TAG},{@link #CONSTANT_FLOAT_TAG}, {@link * #CONSTANT_LONG_TAG}, {@link #CONSTANT_DOUBLE_TAG}, * <li>the CONSTANT_MethodHandle_info reference_kind field value for {@link * #CONSTANT_METHOD_HANDLE_TAG} symbols, * <li>the CONSTANT_InvokeDynamic_info bootstrap_method_attr_index field value for {@link * #CONSTANT_INVOKE_DYNAMIC_TAG} symbols, * <li>the offset of a bootstrap method in the BootstrapMethods boostrap_methods array, for * {@link #CONSTANT_DYNAMIC_TAG} or {@link #BOOTSTRAP_METHOD_TAG} symbols, * <li>the bytecode offset of the NEW instruction that created an {@link * Frame#ITEM_UNINITIALIZED} type for {@link #UNINITIALIZED_TYPE_TAG} symbols, * <li>the indices (in the class' type table) of two {@link #TYPE_TAG} source types for {@link * #MERGED_TYPE_TAG} symbols, * <li>0 for the other types of symbol. * </ul> */
final long data;
Additional information about this symbol, generally computed lazily. Warning: the value of this field is ignored when comparing Symbol instances (to avoid duplicate entries in a SymbolTable). Therefore, this field should only contain data that can be computed from the other fields of this class. It contains:
/** * Additional information about this symbol, generally computed lazily. <i>Warning: the value of * this field is ignored when comparing Symbol instances</i> (to avoid duplicate entries in a * SymbolTable). Therefore, this field should only contain data that can be computed from the * other fields of this class. It contains: * * <ul> * <li>the {@link Type#getArgumentsAndReturnSizes} of the symbol's method descriptor for {@link * #CONSTANT_METHODREF_TAG}, {@link #CONSTANT_INTERFACE_METHODREF_TAG} and {@link * #CONSTANT_INVOKE_DYNAMIC_TAG} symbols, * <li>the index in the InnerClasses_attribute 'classes' array (plus one) corresponding to this * class, for {@link #CONSTANT_CLASS_TAG} symbols, * <li>the index (in the class' type table) of the merged type of the two source types for * {@link #MERGED_TYPE_TAG} symbols, * <li>0 for the other types of symbol, or if this field has not been computed yet. * </ul> */
int info;
Constructs a new Symbol. This constructor can't be used directly because the Symbol class is abstract. Instead, use the factory methods of the SymbolTable class.
Params:
  • index – the symbol index in the constant pool, in the BootstrapMethods attribute, or in the (ASM specific) type table of a class (depending on 'tag').
  • tag – the symbol type. Must be one of the static tag values defined in this class.
  • owner – The internal name of the symbol's owner class. Maybe null.
  • name – The name of the symbol's corresponding class field or method. Maybe null.
  • value – The string value of this symbol. Maybe null.
  • data – The numeric value of this symbol.
/** * Constructs a new Symbol. This constructor can't be used directly because the Symbol class is * abstract. Instead, use the factory methods of the {@link SymbolTable} class. * * @param index the symbol index in the constant pool, in the BootstrapMethods attribute, or in * the (ASM specific) type table of a class (depending on 'tag'). * @param tag the symbol type. Must be one of the static tag values defined in this class. * @param owner The internal name of the symbol's owner class. Maybe {@literal null}. * @param name The name of the symbol's corresponding class field or method. Maybe {@literal * null}. * @param value The string value of this symbol. Maybe {@literal null}. * @param data The numeric value of this symbol. */
Symbol( final int index, final int tag, final String owner, final String name, final String value, final long data) { this.index = index; this.tag = tag; this.owner = owner; this.name = name; this.value = value; this.data = data; }
Returns the result Type.getArgumentsAndReturnSizes on value.
Returns:the result Type.getArgumentsAndReturnSizes on value (memoized in info for efficiency). This should only be used for CONSTANT_METHODREF_TAG, CONSTANT_INTERFACE_METHODREF_TAG and CONSTANT_INVOKE_DYNAMIC_TAG symbols.
/** * Returns the result {@link Type#getArgumentsAndReturnSizes} on {@link #value}. * * @return the result {@link Type#getArgumentsAndReturnSizes} on {@link #value} (memoized in * {@link #info} for efficiency). This should only be used for {@link * #CONSTANT_METHODREF_TAG}, {@link #CONSTANT_INTERFACE_METHODREF_TAG} and {@link * #CONSTANT_INVOKE_DYNAMIC_TAG} symbols. */
int getArgumentsAndReturnSizes() { if (info == 0) { info = Type.getArgumentsAndReturnSizes(value); } return info; } }