📄 classwriter.java
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/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2005 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.drools.asm;
/**
* A {@link ClassVisitor} that generates classes in bytecode form. More
* precisely this visitor generates a byte array conforming to the Java class
* file format. It can be used alone, to generate a Java class "from scratch",
* or with one or more {@link ClassReader ClassReader} and adapter class visitor
* to generate a modified class from one or more existing Java classes.
*
* @author Eric Bruneton
*/
public class ClassWriter
implements
ClassVisitor {
/**
* The type of instructions without any argument.
*/
final static int NOARG_INSN = 0;
/**
* The type of instructions with an signed byte argument.
*/
final static int SBYTE_INSN = 1;
/**
* The type of instructions with an signed short argument.
*/
final static int SHORT_INSN = 2;
/**
* The type of instructions with a local variable index argument.
*/
final static int VAR_INSN = 3;
/**
* The type of instructions with an implicit local variable index argument.
*/
final static int IMPLVAR_INSN = 4;
/**
* The type of instructions with a type descriptor argument.
*/
final static int TYPE_INSN = 5;
/**
* The type of field and method invocations instructions.
*/
final static int FIELDORMETH_INSN = 6;
/**
* The type of the INVOKEINTERFACE instruction.
*/
final static int ITFMETH_INSN = 7;
/**
* The type of instructions with a 2 bytes bytecode offset label.
*/
final static int LABEL_INSN = 8;
/**
* The type of instructions with a 4 bytes bytecode offset label.
*/
final static int LABELW_INSN = 9;
/**
* The type of the LDC instruction.
*/
final static int LDC_INSN = 10;
/**
* The type of the LDC_W and LDC2_W instructions.
*/
final static int LDCW_INSN = 11;
/**
* The type of the IINC instruction.
*/
final static int IINC_INSN = 12;
/**
* The type of the TABLESWITCH instruction.
*/
final static int TABL_INSN = 13;
/**
* The type of the LOOKUPSWITCH instruction.
*/
final static int LOOK_INSN = 14;
/**
* The type of the MULTIANEWARRAY instruction.
*/
final static int MANA_INSN = 15;
/**
* The type of the WIDE instruction.
*/
final static int WIDE_INSN = 16;
/**
* The instruction types of all JVM opcodes.
*/
static byte[] TYPE;
/**
* The type of CONSTANT_Class constant pool items.
*/
final static int CLASS = 7;
/**
* The type of CONSTANT_Fieldref constant pool items.
*/
final static int FIELD = 9;
/**
* The type of CONSTANT_Methodref constant pool items.
*/
final static int METH = 10;
/**
* The type of CONSTANT_InterfaceMethodref constant pool items.
*/
final static int IMETH = 11;
/**
* The type of CONSTANT_String constant pool items.
*/
final static int STR = 8;
/**
* The type of CONSTANT_Integer constant pool items.
*/
final static int INT = 3;
/**
* The type of CONSTANT_Float constant pool items.
*/
final static int FLOAT = 4;
/**
* The type of CONSTANT_Long constant pool items.
*/
final static int LONG = 5;
/**
* The type of CONSTANT_Double constant pool items.
*/
final static int DOUBLE = 6;
/**
* The type of CONSTANT_NameAndType constant pool items.
*/
final static int NAME_TYPE = 12;
/**
* The type of CONSTANT_Utf8 constant pool items.
*/
final static int UTF8 = 1;
/**
* The class reader from which this class writer was constructed, if any.
*/
ClassReader cr;
/**
* Minor and major version numbers of the class to be generated.
*/
int version;
/**
* Index of the next item to be added in the constant pool.
*/
int index;
/**
* The constant pool of this class.
*/
ByteVector pool;
/**
* The constant pool's hash table data.
*/
Item[] items;
/**
* The threshold of the constant pool's hash table.
*/
int threshold;
/**
* A reusable key used to look for items in the hash {@link #items items}.
*/
Item key;
/**
* A reusable key used to look for items in the hash {@link #items items}.
*/
Item key2;
/**
* A reusable key used to look for items in the hash {@link #items items}.
*/
Item key3;
/**
* The access flags of this class.
*/
private int access;
/**
* The constant pool item that contains the internal name of this class.
*/
private int name;
/**
* The constant pool item that contains the signature of this class.
*/
private int signature;
/**
* The constant pool item that contains the internal name of the super class
* of this class.
*/
private int superName;
/**
* Number of interfaces implemented or extended by this class or interface.
*/
private int interfaceCount;
/**
* The interfaces implemented or extended by this class or interface. More
* precisely, this array contains the indexes of the constant pool items
* that contain the internal names of these interfaces.
*/
private int[] interfaces;
/**
* The index of the constant pool item that contains the name of the source
* file from which this class was compiled.
*/
private int sourceFile;
/**
* The SourceDebug attribute of this class.
*/
private ByteVector sourceDebug;
/**
* The constant pool item that contains the name of the enclosing class of
* this class.
*/
private int enclosingMethodOwner;
/**
* The constant pool item that contains the name and descriptor of the
* enclosing method of this class.
*/
private int enclosingMethod;
/**
* The runtime visible annotations of this class.
*/
private AnnotationWriter anns;
/**
* The runtime invisible annotations of this class.
*/
private AnnotationWriter ianns;
/**
* The non standard attributes of this class.
*/
private Attribute attrs;
/**
* The number of entries in the InnerClasses attribute.
*/
private int innerClassesCount;
/**
* The InnerClasses attribute.
*/
private ByteVector innerClasses;
/**
* The fields of this class. These fields are stored in a linked list of
* {@link FieldWriter} objects, linked to each other by their
* {@link FieldWriter#next} field. This field stores the first element of
* this list.
*/
FieldWriter firstField;
/**
* The fields of this class. These fields are stored in a linked list of
* {@link FieldWriter} objects, linked to each other by their
* {@link FieldWriter#next} field. This field stores the last element of
* this list.
*/
FieldWriter lastField;
/**
* The methods of this class. These methods are stored in a linked list of
* {@link MethodWriter} objects, linked to each other by their
* {@link MethodWriter#next} field. This field stores the first element of
* this list.
*/
MethodWriter firstMethod;
/**
* The methods of this class. These methods are stored in a linked list of
* {@link MethodWriter} objects, linked to each other by their
* {@link MethodWriter#next} field. This field stores the last element of
* this list.
*/
MethodWriter lastMethod;
/**
* <tt>true</tt> if the maximum stack size and number of local variables
* must be automatically computed.
*/
private boolean computeMaxs;
// ------------------------------------------------------------------------
// Static initializer
// ------------------------------------------------------------------------
/**
* Computes the instruction types of JVM opcodes.
*/
static {
int i;
final byte[] b = new byte[220];
final String s = "AAAAAAAAAAAAAAAABCKLLDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADD" + "DDDEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" + "AAAAAAAAAAAAAAAAAMAAAAAAAAAAAAAAAAAAAAIIIIIIIIIIIIIIIIDNOAA"
+ "AAAAGGGGGGGHAFBFAAFFAAQPIIJJIIIIIIIIIIIIIIIIII";
for ( i = 0; i < b.length; ++i ) {
b[i] = (byte) (s.charAt( i ) - 'A');
}
ClassWriter.TYPE = b;
// code to generate the above string
//
// // SBYTE_INSN instructions
// b[Constants.NEWARRAY] = SBYTE_INSN;
// b[Constants.BIPUSH] = SBYTE_INSN;
//
// // SHORT_INSN instructions
// b[Constants.SIPUSH] = SHORT_INSN;
//
// // (IMPL)VAR_INSN instructions
// b[Constants.RET] = VAR_INSN;
// for (i = Constants.ILOAD; i <= Constants.ALOAD; ++i) {
// b[i] = VAR_INSN;
// }
// for (i = Constants.ISTORE; i <= Constants.ASTORE; ++i) {
// b[i] = VAR_INSN;
// }
// for (i = 26; i <= 45; ++i) { // ILOAD_0 to ALOAD_3
// b[i] = IMPLVAR_INSN;
// }
// for (i = 59; i <= 78; ++i) { // ISTORE_0 to ASTORE_3
// b[i] = IMPLVAR_INSN;
// }
//
// // TYPE_INSN instructions
// b[Constants.NEW] = TYPE_INSN;
// b[Constants.ANEWARRAY] = TYPE_INSN;
// b[Constants.CHECKCAST] = TYPE_INSN;
// b[Constants.INSTANCEOF] = TYPE_INSN;
//
// // (Set)FIELDORMETH_INSN instructions
// for (i = Constants.GETSTATIC; i <= Constants.INVOKESTATIC; ++i) {
// b[i] = FIELDORMETH_INSN;
// }
// b[Constants.INVOKEINTERFACE] = ITFMETH_INSN;
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