| // ASM: a very small and fast Java bytecode manipulation framework |
| // Copyright (c) 2000-2011 INRIA, France Telecom |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // 1. Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // 2. Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // 3. Neither the name of the copyright holders nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| // THE POSSIBILITY OF SUCH DAMAGE. |
| package org.apache.tapestry5.internal.plastic.asm; |
| |
| /** |
| * 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. */ |
| static final int CONSTANT_CLASS_TAG = 7; |
| |
| /** 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. */ |
| static final int CONSTANT_METHODREF_TAG = 10; |
| |
| /** 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. */ |
| static final int CONSTANT_STRING_TAG = 8; |
| |
| /** 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. */ |
| static final int CONSTANT_FLOAT_TAG = 4; |
| |
| /** 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. */ |
| static final int CONSTANT_DOUBLE_TAG = 6; |
| |
| /** 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. */ |
| static final int CONSTANT_UTF8_TAG = 1; |
| |
| /** 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. */ |
| static final int CONSTANT_METHOD_TYPE_TAG = 16; |
| |
| /** 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. */ |
| static final int CONSTANT_INVOKE_DYNAMIC_TAG = 18; |
| |
| /** 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. */ |
| 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. */ |
| 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. */ |
| static final int TYPE_TAG = 128; |
| |
| /** |
| * 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. */ |
| 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 {@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. |
| */ |
| final int tag; |
| |
| /** |
| * 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: |
| * |
| * <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: |
| * |
| * <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. <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 {@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 {@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; |
| } |
| } |