1034 lines
28 KiB
Java
1034 lines
28 KiB
Java
/***
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* ASM: a very small and fast Java bytecode manipulation framework
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* Copyright (c) 2000,2002,2003 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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* Contact: Eric.Bruneton@rd.francetelecom.com
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*
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* Author: Eric Bruneton
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*/
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package org.objectweb.asm;
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/**
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* A {@link ClassVisitor ClassVisitor} that generates Java class files. More
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* precisely this visitor generates a byte array conforming to the Java class
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* file format. It can be used alone, to generate a Java class "from scratch",
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* or with one or more {@link ClassReader ClassReader} and adapter class
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* visitor to generate a modified class from one or more existing Java classes.
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*/
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public class ClassWriter implements ClassVisitor {
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/**
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* The type of CONSTANT_Class constant pool items.
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*/
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final static int CLASS = 7;
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/**
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* The type of CONSTANT_Fieldref constant pool items.
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*/
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final static int FIELD = 9;
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/**
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* The type of CONSTANT_Methodref constant pool items.
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*/
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final static int METH = 10;
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/**
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* The type of CONSTANT_InterfaceMethodref constant pool items.
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*/
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final static int IMETH = 11;
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/**
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* The type of CONSTANT_String constant pool items.
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*/
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final static int STR = 8;
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/**
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* The type of CONSTANT_Integer constant pool items.
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*/
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final static int INT = 3;
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/**
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* The type of CONSTANT_Float constant pool items.
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*/
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final static int FLOAT = 4;
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/**
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* The type of CONSTANT_Long constant pool items.
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*/
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final static int LONG = 5;
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/**
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* The type of CONSTANT_Double constant pool items.
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*/
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final static int DOUBLE = 6;
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/**
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* The type of CONSTANT_NameAndType constant pool items.
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*/
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final static int NAME_TYPE = 12;
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/**
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* The type of CONSTANT_Utf8 constant pool items.
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*/
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final static int UTF8 = 1;
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/**
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* Minor and major version numbers of the class to be generated.
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*/
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private int version;
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/**
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* Index of the next item to be added in the constant pool.
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*/
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private short index;
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/**
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* The constant pool of this class.
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*/
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private ByteVector pool;
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/**
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* The constant pool's hash table data.
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*/
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private Item[] items;
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/**
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* The threshold of the constant pool's hash table.
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*/
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private int threshold;
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/**
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* The access flags of this class.
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*/
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private int access;
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/**
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* The constant pool item that contains the internal name of this class.
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*/
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private int name;
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/**
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* The constant pool item that contains the internal name of the super class
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* of this class.
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*/
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private int superName;
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/**
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* Number of interfaces implemented or extended by this class or interface.
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*/
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private int interfaceCount;
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/**
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* The interfaces implemented or extended by this class or interface. More
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* precisely, this array contains the indexes of the constant pool items
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* that contain the internal names of these interfaces.
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*/
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private int[] interfaces;
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/**
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* The index of the constant pool item that contains the name of the source
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* file from which this class was compiled.
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*/
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private int sourceFile;
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/**
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* Number of fields of this class.
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*/
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private int fieldCount;
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/**
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* The fields of this class.
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*/
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private ByteVector fields;
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/**
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* <tt>true</tt> if the maximum stack size and number of local variables must
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* be automatically computed.
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*/
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private boolean computeMaxs;
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/**
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* The methods of this class. These methods are stored in a linked list of
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* {@link CodeWriter CodeWriter} objects, linked to each other by their {@link
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* CodeWriter#next} field. This field stores the first element of this list.
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*/
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CodeWriter firstMethod;
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/**
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* The methods of this class. These methods are stored in a linked list of
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* {@link CodeWriter CodeWriter} objects, linked to each other by their {@link
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* CodeWriter#next} field. This field stores the last element of this list.
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*/
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CodeWriter lastMethod;
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/**
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* The number of entries in the InnerClasses attribute.
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*/
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private int innerClassesCount;
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/**
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* The InnerClasses attribute.
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*/
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private ByteVector innerClasses;
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/**
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* The non standard attributes of the class.
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*/
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private Attribute attrs;
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/**
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* A reusable key used to look for items in the hash {@link #items items}.
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*/
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Item key;
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/**
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* A reusable key used to look for items in the hash {@link #items items}.
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*/
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Item key2;
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/**
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* A reusable key used to look for items in the hash {@link #items items}.
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*/
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Item key3;
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/**
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* The type of instructions without any label.
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*/
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final static int NOARG_INSN = 0;
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/**
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* The type of instructions with an signed byte label.
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*/
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final static int SBYTE_INSN = 1;
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/**
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* The type of instructions with an signed short label.
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*/
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final static int SHORT_INSN = 2;
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/**
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* The type of instructions with a local variable index label.
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*/
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final static int VAR_INSN = 3;
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/**
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* The type of instructions with an implicit local variable index label.
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*/
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final static int IMPLVAR_INSN = 4;
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/**
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* The type of instructions with a type descriptor argument.
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*/
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final static int TYPE_INSN = 5;
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/**
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* The type of field and method invocations instructions.
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*/
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final static int FIELDORMETH_INSN = 6;
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/**
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* The type of the INVOKEINTERFACE instruction.
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*/
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final static int ITFMETH_INSN = 7;
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/**
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* The type of instructions with a 2 bytes bytecode offset label.
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*/
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final static int LABEL_INSN = 8;
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/**
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* The type of instructions with a 4 bytes bytecode offset label.
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*/
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final static int LABELW_INSN = 9;
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/**
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* The type of the LDC instruction.
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*/
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final static int LDC_INSN = 10;
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/**
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* The type of the LDC_W and LDC2_W instructions.
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*/
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final static int LDCW_INSN = 11;
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/**
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* The type of the IINC instruction.
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*/
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final static int IINC_INSN = 12;
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/**
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* The type of the TABLESWITCH instruction.
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*/
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final static int TABL_INSN = 13;
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/**
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* The type of the LOOKUPSWITCH instruction.
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*/
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final static int LOOK_INSN = 14;
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/**
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* The type of the MULTIANEWARRAY instruction.
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*/
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final static int MANA_INSN = 15;
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/**
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* The type of the WIDE instruction.
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*/
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final static int WIDE_INSN = 16;
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/**
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* The instruction types of all JVM opcodes.
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*/
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static byte[] TYPE;
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// --------------------------------------------------------------------------
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// Static initializer
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// --------------------------------------------------------------------------
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/**
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* Computes the instruction types of JVM opcodes.
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*/
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static {
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int i;
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byte[] b = new byte[220];
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String s =
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"AAAAAAAAAAAAAAAABCKLLDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADDDDDEEEEEEEEE" +
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"EEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAAA" +
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"AAAAAAAAAAAAAAAAAIIIIIIIIIIIIIIIIDNOAAAAAAGGGGGGGHAFBFAAFFAAQPIIJJII" +
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"IIIIIIIIIIIIIIII";
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for (i = 0; i < b.length; ++i) {
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b[i] = (byte)(s.charAt(i) - 'A');
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}
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TYPE = b;
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/* code to generate the above string
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// SBYTE_INSN instructions
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b[Constants.NEWARRAY] = SBYTE_INSN;
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b[Constants.BIPUSH] = SBYTE_INSN;
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// SHORT_INSN instructions
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b[Constants.SIPUSH] = SHORT_INSN;
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// (IMPL)VAR_INSN instructions
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b[Constants.RET] = VAR_INSN;
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for (i = Constants.ILOAD; i <= Constants.ALOAD; ++i) {
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b[i] = VAR_INSN;
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}
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for (i = Constants.ISTORE; i <= Constants.ASTORE; ++i) {
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b[i] = VAR_INSN;
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}
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for (i = 26; i <= 45; ++i) { // ILOAD_0 to ALOAD_3
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b[i] = IMPLVAR_INSN;
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}
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for (i = 59; i <= 78; ++i) { // ISTORE_0 to ASTORE_3
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b[i] = IMPLVAR_INSN;
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}
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// TYPE_INSN instructions
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b[Constants.NEW] = TYPE_INSN;
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b[Constants.ANEWARRAY] = TYPE_INSN;
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b[Constants.CHECKCAST] = TYPE_INSN;
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b[Constants.INSTANCEOF] = TYPE_INSN;
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// (Set)FIELDORMETH_INSN instructions
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for (i = Constants.GETSTATIC; i <= Constants.INVOKESTATIC; ++i) {
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b[i] = FIELDORMETH_INSN;
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}
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b[Constants.INVOKEINTERFACE] = ITFMETH_INSN;
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// LABEL(W)_INSN instructions
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for (i = Constants.IFEQ; i <= Constants.JSR; ++i) {
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b[i] = LABEL_INSN;
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}
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b[Constants.IFNULL] = LABEL_INSN;
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b[Constants.IFNONNULL] = LABEL_INSN;
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b[200] = LABELW_INSN; // GOTO_W
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b[201] = LABELW_INSN; // JSR_W
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// temporary opcodes used internally by ASM - see Label and CodeWriter
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for (i = 202; i < 220; ++i) {
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b[i] = LABEL_INSN;
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}
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// LDC(_W) instructions
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b[Constants.LDC] = LDC_INSN;
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b[19] = LDCW_INSN; // LDC_W
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b[20] = LDCW_INSN; // LDC2_W
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// special instructions
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b[Constants.IINC] = IINC_INSN;
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b[Constants.TABLESWITCH] = TABL_INSN;
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b[Constants.LOOKUPSWITCH] = LOOK_INSN;
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b[Constants.MULTIANEWARRAY] = MANA_INSN;
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b[196] = WIDE_INSN; // WIDE
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for (i = 0; i < b.length; ++i) {
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System.err.print((char)('A' + b[i]));
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}
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System.err.println();
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*/
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}
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// --------------------------------------------------------------------------
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// Constructor
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// --------------------------------------------------------------------------
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/**
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* Constructs a new {@link ClassWriter ClassWriter} object.
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*
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* @param computeMaxs <tt>true</tt> if the maximum stack size and the maximum
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* number of local variables must be automatically computed. If this flag
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* is <tt>true</tt>, then the arguments of the {@link
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* CodeVisitor#visitMaxs visitMaxs} method of the {@link CodeVisitor
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* CodeVisitor} returned by the {@link #visitMethod visitMethod} method
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* will be ignored, and computed automatically from the signature and
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* the bytecode of each method.
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*/
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public ClassWriter (final boolean computeMaxs) {
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this(computeMaxs, 45, 3);
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}
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/**
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* Constructs a new {@link ClassWriter ClassWriter} object.
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*
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* @param computeMaxs <tt>true</tt> if the maximum stack size and the maximum
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* number of local variables must be automatically computed. If this flag
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* is <tt>true</tt>, then the arguments of the {@link
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* CodeVisitor#visitMaxs visitMaxs} method of the {@link CodeVisitor
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* CodeVisitor} returned by the {@link #visitMethod visitMethod} method
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* will be ignored, and computed automatically from the signature and
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* the bytecode of each method.
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* @param major the major version of the class to be generated.
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* @param minor the minor version of the class to be generated.
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*/
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public ClassWriter (final boolean computeMaxs, final int major, final int minor) {
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index = 1;
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pool = new ByteVector();
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items = new Item[64];
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threshold = (int)(0.75d*items.length);
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key = new Item();
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key2 = new Item();
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key3 = new Item();
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this.computeMaxs = computeMaxs;
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this.version = minor << 16 | major;
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}
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// --------------------------------------------------------------------------
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// Implementation of the ClassVisitor interface
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// --------------------------------------------------------------------------
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public void visit (
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final int access,
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final String name,
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final String superName,
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final String[] interfaces,
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final String sourceFile)
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{
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this.access = access;
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this.name = newClass(name);
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this.superName = superName == null ? 0 : newClass(superName);
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if (interfaces != null && interfaces.length > 0) {
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interfaceCount = interfaces.length;
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this.interfaces = new int[interfaceCount];
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for (int i = 0; i < interfaceCount; ++i) {
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this.interfaces[i] = newClass(interfaces[i]);
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}
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}
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if (sourceFile != null) {
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newUTF8("SourceFile");
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this.sourceFile = newUTF8(sourceFile);
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}
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if ((access & Constants.ACC_DEPRECATED) != 0) {
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newUTF8("Deprecated");
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}
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}
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public void visitInnerClass (
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final String name,
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final String outerName,
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final String innerName,
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final int access)
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{
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if (innerClasses == null) {
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newUTF8("InnerClasses");
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innerClasses = new ByteVector();
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}
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++innerClassesCount;
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innerClasses.putShort(name == null ? 0 : newClass(name));
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innerClasses.putShort(outerName == null ? 0 : newClass(outerName));
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innerClasses.putShort(innerName == null ? 0 : newUTF8(innerName));
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innerClasses.putShort(access);
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}
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public void visitField (
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final int access,
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final String name,
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final String desc,
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final Object value,
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final Attribute attrs)
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{
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++fieldCount;
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if (fields == null) {
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fields = new ByteVector();
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}
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fields.putShort(access).putShort(newUTF8(name)).putShort(newUTF8(desc));
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int attributeCount = 0;
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if (value != null) {
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++attributeCount;
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}
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if ((access & Constants.ACC_SYNTHETIC) != 0) {
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++attributeCount;
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}
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if ((access & Constants.ACC_DEPRECATED) != 0) {
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++attributeCount;
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}
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if (attrs != null) {
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attributeCount += attrs.getCount();
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}
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fields.putShort(attributeCount);
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if (value != null) {
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fields.putShort(newUTF8("ConstantValue"));
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fields.putInt(2).putShort(newCst(value).index);
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}
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if ((access & Constants.ACC_SYNTHETIC) != 0) {
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fields.putShort(newUTF8("Synthetic")).putInt(0);
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}
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if ((access & Constants.ACC_DEPRECATED) != 0) {
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fields.putShort(newUTF8("Deprecated")).putInt(0);
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}
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if (attrs != null) {
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attrs.getSize(this, null, 0, -1, -1);
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attrs.put(this, null, 0, -1, -1, fields);
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}
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}
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public CodeVisitor visitMethod (
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final int access,
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final String name,
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final String desc,
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final String[] exceptions,
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final Attribute attrs)
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{
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CodeWriter cw = new CodeWriter(this, computeMaxs);
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cw.init(access, name, desc, exceptions, attrs);
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return cw;
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}
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public void visitAttribute (final Attribute attr) {
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|
attr.next = attrs;
|
|
attrs = attr;
|
|
}
|
|
|
|
public void visitEnd () {
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// Other public methods
|
|
// --------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns the bytecode of the class that was build with this class writer.
|
|
*
|
|
* @return the bytecode of the class that was build with this class writer.
|
|
*/
|
|
|
|
public byte[] toByteArray () {
|
|
// computes the real size of the bytecode of this class
|
|
int size = 24 + 2*interfaceCount;
|
|
if (fields != null) {
|
|
size += fields.length;
|
|
}
|
|
int nbMethods = 0;
|
|
CodeWriter cb = firstMethod;
|
|
while (cb != null) {
|
|
++nbMethods;
|
|
size += cb.getSize();
|
|
cb = cb.next;
|
|
}
|
|
int attributeCount = 0;
|
|
if (sourceFile != 0) {
|
|
++attributeCount;
|
|
size += 8;
|
|
}
|
|
if ((access & Constants.ACC_DEPRECATED) != 0) {
|
|
++attributeCount;
|
|
size += 6;
|
|
}
|
|
if (innerClasses != null) {
|
|
++attributeCount;
|
|
size += 8 + innerClasses.length;
|
|
}
|
|
if (attrs != null) {
|
|
attributeCount += attrs.getCount();
|
|
size += attrs.getSize(this, null, 0, -1, -1);
|
|
}
|
|
size += pool.length;
|
|
// allocates a byte vector of this size, in order to avoid unnecessary
|
|
// arraycopy operations in the ByteVector.enlarge() method
|
|
ByteVector out = new ByteVector(size);
|
|
out.putInt(0xCAFEBABE).putInt(version);
|
|
out.putShort(index).putByteArray(pool.data, 0, pool.length);
|
|
out.putShort(access).putShort(name).putShort(superName);
|
|
out.putShort(interfaceCount);
|
|
for (int i = 0; i < interfaceCount; ++i) {
|
|
out.putShort(interfaces[i]);
|
|
}
|
|
out.putShort(fieldCount);
|
|
if (fields != null) {
|
|
out.putByteArray(fields.data, 0, fields.length);
|
|
}
|
|
out.putShort(nbMethods);
|
|
cb = firstMethod;
|
|
while (cb != null) {
|
|
cb.put(out);
|
|
cb = cb.next;
|
|
}
|
|
out.putShort(attributeCount);
|
|
if (sourceFile != 0) {
|
|
out.putShort(newUTF8("SourceFile")).putInt(2).putShort(sourceFile);
|
|
}
|
|
if ((access & Constants.ACC_DEPRECATED) != 0) {
|
|
out.putShort(newUTF8("Deprecated")).putInt(0);
|
|
}
|
|
if (innerClasses != null) {
|
|
out.putShort(newUTF8("InnerClasses"));
|
|
out.putInt(innerClasses.length + 2).putShort(innerClassesCount);
|
|
out.putByteArray(innerClasses.data, 0, innerClasses.length);
|
|
}
|
|
if (attrs != null) {
|
|
attrs.put(this, null, 0, -1, -1, out);
|
|
}
|
|
return out.data;
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// Utility methods: constant pool management
|
|
// --------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Adds a number or string constant to the constant pool of the class being
|
|
* build. Does nothing if the constant pool already contains a similar item.
|
|
*
|
|
* @param cst the value of the constant to be added to the constant pool. This
|
|
* parameter must be an {@link java.lang.Integer Integer}, a {@link
|
|
* java.lang.Float Float}, a {@link java.lang.Long Long}, a {@link
|
|
java.lang.Double Double} or a {@link String String}.
|
|
* @return a new or already existing constant item with the given value.
|
|
*/
|
|
|
|
Item newCst (final Object cst) {
|
|
if (cst instanceof Integer) {
|
|
int val = ((Integer)cst).intValue();
|
|
return newInteger(val);
|
|
} else if (cst instanceof Float) {
|
|
float val = ((Float)cst).floatValue();
|
|
return newFloat(val);
|
|
} else if (cst instanceof Long) {
|
|
long val = ((Long)cst).longValue();
|
|
return newLong(val);
|
|
} else if (cst instanceof Double) {
|
|
double val = ((Double)cst).doubleValue();
|
|
return newDouble(val);
|
|
} else if (cst instanceof String) {
|
|
return newString((String)cst);
|
|
} else {
|
|
throw new IllegalArgumentException("value " + cst);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Adds a number or string constant to the constant pool of the class being
|
|
* build. Does nothing if the constant pool already contains a similar item.
|
|
* <i>This method is intended for {@link Attribute} sub classes, and is
|
|
* normally not needed by class generators or adapters.</i>
|
|
*
|
|
* @param cst the value of the constant to be added to the constant pool. This
|
|
* parameter must be an {@link java.lang.Integer Integer}, a {@link
|
|
* java.lang.Float Float}, a {@link java.lang.Long Long}, a {@link
|
|
java.lang.Double Double} or a {@link String String}.
|
|
* @return the index of a new or already existing constant item with the given
|
|
* value.
|
|
*/
|
|
|
|
public int newConst (final Object cst) {
|
|
return newCst(cst).index;
|
|
}
|
|
|
|
/**
|
|
* Adds an UTF8 string to the constant pool of the class being build. Does
|
|
* nothing if the constant pool already contains a similar item. <i>This
|
|
* method is intended for {@link Attribute} sub classes, and is normally not
|
|
* needed by class generators or adapters.</i>
|
|
*
|
|
* @param value the String value.
|
|
* @return the index of a new or already existing UTF8 item.
|
|
*/
|
|
|
|
public int newUTF8 (final String value) {
|
|
key.set(UTF8, value, null, null);
|
|
Item result = get(key);
|
|
if (result == null) {
|
|
pool.putByte(UTF8).putUTF8(value);
|
|
result = new Item(index++, key);
|
|
put(result);
|
|
}
|
|
return result.index;
|
|
}
|
|
|
|
/**
|
|
* Adds a class reference to the constant pool of the class being build. Does
|
|
* nothing if the constant pool already contains a similar item. <i>This
|
|
* method is intended for {@link Attribute} sub classes, and is normally not
|
|
* needed by class generators or adapters.</i>
|
|
*
|
|
* @param value the internal name of the class.
|
|
* @return the index of a new or already existing class reference item.
|
|
*/
|
|
|
|
public int newClass (final String value) {
|
|
key2.set(CLASS, value, null, null);
|
|
Item result = get(key2);
|
|
if (result == null) {
|
|
pool.put12(CLASS, newUTF8(value));
|
|
result = new Item(index++, key2);
|
|
put(result);
|
|
}
|
|
return result.index;
|
|
}
|
|
|
|
/**
|
|
* Adds a field reference to the constant pool of the class being build. Does
|
|
* nothing if the constant pool already contains a similar item. <i>This
|
|
* method is intended for {@link Attribute} sub classes, and is normally not
|
|
* needed by class generators or adapters.</i>
|
|
*
|
|
* @param owner the internal name of the field's owner class.
|
|
* @param name the field's name.
|
|
* @param desc the field's descriptor.
|
|
* @return the index of a new or already existing field reference item.
|
|
*/
|
|
|
|
public int newField (
|
|
final String owner,
|
|
final String name,
|
|
final String desc)
|
|
{
|
|
key3.set(FIELD, owner, name, desc);
|
|
Item result = get(key3);
|
|
if (result == null) {
|
|
put122(FIELD, newClass(owner), newNameType(name, desc));
|
|
result = new Item(index++, key3);
|
|
put(result);
|
|
}
|
|
return result.index;
|
|
}
|
|
|
|
/**
|
|
* Adds a method reference to the constant pool of the class being build. Does
|
|
* nothing if the constant pool already contains a similar item.
|
|
*
|
|
* @param owner the internal name of the method's owner class.
|
|
* @param name the method's name.
|
|
* @param desc the method's descriptor.
|
|
* @param itf <tt>true</tt> if <tt>owner</tt> is an interface.
|
|
* @return a new or already existing method reference item.
|
|
*/
|
|
|
|
Item newMethodItem (
|
|
final String owner,
|
|
final String name,
|
|
final String desc,
|
|
final boolean itf)
|
|
{
|
|
key3.set(itf ? IMETH : METH, owner, name, desc);
|
|
Item result = get(key3);
|
|
if (result == null) {
|
|
put122(itf ? IMETH : METH, newClass(owner), newNameType(name, desc));
|
|
result = new Item(index++, key3);
|
|
put(result);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Adds a method reference to the constant pool of the class being build. Does
|
|
* nothing if the constant pool already contains a similar item. <i>This
|
|
* method is intended for {@link Attribute} sub classes, and is normally not
|
|
* needed by class generators or adapters.</i>
|
|
*
|
|
* @param owner the internal name of the method's owner class.
|
|
* @param name the method's name.
|
|
* @param desc the method's descriptor.
|
|
* @param itf <tt>true</tt> if <tt>owner</tt> is an interface.
|
|
* @return the index of a new or already existing method reference item.
|
|
*/
|
|
|
|
public int newMethod (
|
|
final String owner,
|
|
final String name,
|
|
final String desc,
|
|
final boolean itf)
|
|
{
|
|
return newMethodItem(owner, name, desc, itf).index;
|
|
}
|
|
|
|
/**
|
|
* Adds an integer to the constant pool of the class being build. Does nothing
|
|
* if the constant pool already contains a similar item.
|
|
*
|
|
* @param value the int value.
|
|
* @return a new or already existing int item.
|
|
*/
|
|
|
|
private Item newInteger (final int value) {
|
|
key.set(value);
|
|
Item result = get(key);
|
|
if (result == null) {
|
|
pool.putByte(INT).putInt(value);
|
|
result = new Item(index++, key);
|
|
put(result);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Adds a float to the constant pool of the class being build. Does nothing if
|
|
* the constant pool already contains a similar item.
|
|
*
|
|
* @param value the float value.
|
|
* @return a new or already existing float item.
|
|
*/
|
|
|
|
private Item newFloat (final float value) {
|
|
key.set(value);
|
|
Item result = get(key);
|
|
if (result == null) {
|
|
pool.putByte(FLOAT).putInt(Float.floatToIntBits(value));
|
|
result = new Item(index++, key);
|
|
put(result);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Adds a long to the constant pool of the class being build. Does nothing if
|
|
* the constant pool already contains a similar item.
|
|
*
|
|
* @param value the long value.
|
|
* @return a new or already existing long item.
|
|
*/
|
|
|
|
private Item newLong (final long value) {
|
|
key.set(value);
|
|
Item result = get(key);
|
|
if (result == null) {
|
|
pool.putByte(LONG).putLong(value);
|
|
result = new Item(index, key);
|
|
put(result);
|
|
index += 2;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Adds a double to the constant pool of the class being build. Does nothing
|
|
* if the constant pool already contains a similar item.
|
|
*
|
|
* @param value the double value.
|
|
* @return a new or already existing double item.
|
|
*/
|
|
|
|
private Item newDouble (final double value) {
|
|
key.set(value);
|
|
Item result = get(key);
|
|
if (result == null) {
|
|
pool.putByte(DOUBLE).putLong(Double.doubleToLongBits(value));
|
|
result = new Item(index, key);
|
|
put(result);
|
|
index += 2;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Adds a string to the constant pool of the class being build. Does nothing
|
|
* if the constant pool already contains a similar item.
|
|
*
|
|
* @param value the String value.
|
|
* @return a new or already existing string item.
|
|
*/
|
|
|
|
private Item newString (final String value) {
|
|
key2.set(STR, value, null, null);
|
|
Item result = get(key2);
|
|
if (result == null) {
|
|
pool.put12(STR, newUTF8(value));
|
|
result = new Item(index++, key2);
|
|
put(result);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Adds a name and type to the constant pool of the class being build. Does
|
|
* nothing if the constant pool already contains a similar item.
|
|
*
|
|
* @param name a name.
|
|
* @param desc a type descriptor.
|
|
* @return the index of a new or already existing name and type item.
|
|
*/
|
|
|
|
private int newNameType (final String name, final String desc) {
|
|
key2.set(NAME_TYPE, name, desc, null);
|
|
Item result = get(key2);
|
|
if (result == null) {
|
|
put122(NAME_TYPE, newUTF8(name), newUTF8(desc));
|
|
result = new Item(index++, key2);
|
|
put(result);
|
|
}
|
|
return result.index;
|
|
}
|
|
|
|
/**
|
|
* Returns the constant pool's hash table item which is equal to the given
|
|
* item.
|
|
*
|
|
* @param key a constant pool item.
|
|
* @return the constant pool's hash table item which is equal to the given
|
|
* item, or <tt>null</tt> if there is no such item.
|
|
*/
|
|
|
|
private Item get (final Item key) {
|
|
int h = key.hashCode;
|
|
Item i = items[h % items.length];
|
|
while (i != null) {
|
|
if (i.hashCode == h && key.isEqualTo(i)) {
|
|
return i;
|
|
}
|
|
i = i.next;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Puts the given item in the constant pool's hash table. The hash table
|
|
* <i>must</i> not already contains this item.
|
|
*
|
|
* @param i the item to be added to the constant pool's hash table.
|
|
*/
|
|
|
|
private void put (final Item i) {
|
|
if (index > threshold) {
|
|
Item[] newItems = new Item[items.length * 2 + 1];
|
|
for (int l = items.length - 1; l >= 0; --l) {
|
|
Item j = items[l];
|
|
while (j != null) {
|
|
int index = j.hashCode % newItems.length;
|
|
Item k = j.next;
|
|
j.next = newItems[index];
|
|
newItems[index] = j;
|
|
j = k;
|
|
}
|
|
}
|
|
items = newItems;
|
|
threshold = (int)(items.length * 0.75);
|
|
}
|
|
int index = i.hashCode % items.length;
|
|
i.next = items[index];
|
|
items[index] = i;
|
|
}
|
|
|
|
/**
|
|
* Puts one byte and two shorts into the constant pool.
|
|
*
|
|
* @param b a byte.
|
|
* @param s1 a short.
|
|
* @param s2 another short.
|
|
*/
|
|
|
|
private void put122 (final int b, final int s1, final int s2) {
|
|
pool.put12(b, s1).putShort(s2);
|
|
}
|
|
}
|