1777 lines
61 KiB
Java
1777 lines
61 KiB
Java
|
/***
|
||
|
* 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.objectweb.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 extends ClassVisitor {
|
||
|
|
||
|
/**
|
||
|
* Flag to automatically compute the maximum stack size and the maximum
|
||
|
* number of local variables of methods. If this flag is set, then the
|
||
|
* arguments of the {@link MethodVisitor#visitMaxs visitMaxs} method of the
|
||
|
* {@link MethodVisitor} returned by the {@link #visitMethod visitMethod}
|
||
|
* method will be ignored, and computed automatically from the signature and
|
||
|
* the bytecode of each method.
|
||
|
*
|
||
|
* @see #ClassWriter(int)
|
||
|
*/
|
||
|
public static final int COMPUTE_MAXS = 1;
|
||
|
|
||
|
/**
|
||
|
* Flag to automatically compute the stack map frames of methods from
|
||
|
* scratch. If this flag is set, then the calls to the
|
||
|
* {@link MethodVisitor#visitFrame} method are ignored, and the stack map
|
||
|
* frames are recomputed from the methods bytecode. The arguments of the
|
||
|
* {@link MethodVisitor#visitMaxs visitMaxs} method are also ignored and
|
||
|
* recomputed from the bytecode. In other words, computeFrames implies
|
||
|
* computeMaxs.
|
||
|
*
|
||
|
* @see #ClassWriter(int)
|
||
|
*/
|
||
|
public static final int COMPUTE_FRAMES = 2;
|
||
|
|
||
|
/**
|
||
|
* Pseudo access flag to distinguish between the synthetic attribute and the
|
||
|
* synthetic access flag.
|
||
|
*/
|
||
|
static final int ACC_SYNTHETIC_ATTRIBUTE = 0x40000;
|
||
|
|
||
|
/**
|
||
|
* Factor to convert from ACC_SYNTHETIC_ATTRIBUTE to Opcode.ACC_SYNTHETIC.
|
||
|
*/
|
||
|
static final int TO_ACC_SYNTHETIC = ACC_SYNTHETIC_ATTRIBUTE
|
||
|
/ Opcodes.ACC_SYNTHETIC;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions without any argument.
|
||
|
*/
|
||
|
static final int NOARG_INSN = 0;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions with an signed byte argument.
|
||
|
*/
|
||
|
static final int SBYTE_INSN = 1;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions with an signed short argument.
|
||
|
*/
|
||
|
static final int SHORT_INSN = 2;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions with a local variable index argument.
|
||
|
*/
|
||
|
static final int VAR_INSN = 3;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions with an implicit local variable index argument.
|
||
|
*/
|
||
|
static final int IMPLVAR_INSN = 4;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions with a type descriptor argument.
|
||
|
*/
|
||
|
static final int TYPE_INSN = 5;
|
||
|
|
||
|
/**
|
||
|
* The type of field and method invocations instructions.
|
||
|
*/
|
||
|
static final int FIELDORMETH_INSN = 6;
|
||
|
|
||
|
/**
|
||
|
* The type of the INVOKEINTERFACE/INVOKEDYNAMIC instruction.
|
||
|
*/
|
||
|
static final int ITFMETH_INSN = 7;
|
||
|
|
||
|
/**
|
||
|
* The type of the INVOKEDYNAMIC instruction.
|
||
|
*/
|
||
|
static final int INDYMETH_INSN = 8;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions with a 2 bytes bytecode offset label.
|
||
|
*/
|
||
|
static final int LABEL_INSN = 9;
|
||
|
|
||
|
/**
|
||
|
* The type of instructions with a 4 bytes bytecode offset label.
|
||
|
*/
|
||
|
static final int LABELW_INSN = 10;
|
||
|
|
||
|
/**
|
||
|
* The type of the LDC instruction.
|
||
|
*/
|
||
|
static final int LDC_INSN = 11;
|
||
|
|
||
|
/**
|
||
|
* The type of the LDC_W and LDC2_W instructions.
|
||
|
*/
|
||
|
static final int LDCW_INSN = 12;
|
||
|
|
||
|
/**
|
||
|
* The type of the IINC instruction.
|
||
|
*/
|
||
|
static final int IINC_INSN = 13;
|
||
|
|
||
|
/**
|
||
|
* The type of the TABLESWITCH instruction.
|
||
|
*/
|
||
|
static final int TABL_INSN = 14;
|
||
|
|
||
|
/**
|
||
|
* The type of the LOOKUPSWITCH instruction.
|
||
|
*/
|
||
|
static final int LOOK_INSN = 15;
|
||
|
|
||
|
/**
|
||
|
* The type of the MULTIANEWARRAY instruction.
|
||
|
*/
|
||
|
static final int MANA_INSN = 16;
|
||
|
|
||
|
/**
|
||
|
* The type of the WIDE instruction.
|
||
|
*/
|
||
|
static final int WIDE_INSN = 17;
|
||
|
|
||
|
/**
|
||
|
* The instruction types of all JVM opcodes.
|
||
|
*/
|
||
|
static final byte[] TYPE;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Class constant pool items.
|
||
|
*/
|
||
|
static final int CLASS = 7;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Fieldref constant pool items.
|
||
|
*/
|
||
|
static final int FIELD = 9;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Methodref constant pool items.
|
||
|
*/
|
||
|
static final int METH = 10;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_InterfaceMethodref constant pool items.
|
||
|
*/
|
||
|
static final int IMETH = 11;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_String constant pool items.
|
||
|
*/
|
||
|
static final int STR = 8;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Integer constant pool items.
|
||
|
*/
|
||
|
static final int INT = 3;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Float constant pool items.
|
||
|
*/
|
||
|
static final int FLOAT = 4;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Long constant pool items.
|
||
|
*/
|
||
|
static final int LONG = 5;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Double constant pool items.
|
||
|
*/
|
||
|
static final int DOUBLE = 6;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_NameAndType constant pool items.
|
||
|
*/
|
||
|
static final int NAME_TYPE = 12;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_Utf8 constant pool items.
|
||
|
*/
|
||
|
static final int UTF8 = 1;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_MethodType constant pool items.
|
||
|
*/
|
||
|
static final int MTYPE = 16;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_MethodHandle constant pool items.
|
||
|
*/
|
||
|
static final int HANDLE = 15;
|
||
|
|
||
|
/**
|
||
|
* The type of CONSTANT_InvokeDynamic constant pool items.
|
||
|
*/
|
||
|
static final int INDY = 18;
|
||
|
|
||
|
/**
|
||
|
* The base value for all CONSTANT_MethodHandle constant pool items.
|
||
|
* Internally, ASM store the 9 variations of CONSTANT_MethodHandle into 9
|
||
|
* different items.
|
||
|
*/
|
||
|
static final int HANDLE_BASE = 20;
|
||
|
|
||
|
/**
|
||
|
* Normal type Item stored in the ClassWriter {@link ClassWriter#typeTable},
|
||
|
* instead of the constant pool, in order to avoid clashes with normal
|
||
|
* constant pool items in the ClassWriter constant pool's hash table.
|
||
|
*/
|
||
|
static final int TYPE_NORMAL = 30;
|
||
|
|
||
|
/**
|
||
|
* Uninitialized type Item stored in the ClassWriter
|
||
|
* {@link ClassWriter#typeTable}, instead of the constant pool, in order to
|
||
|
* avoid clashes with normal constant pool items in the ClassWriter constant
|
||
|
* pool's hash table.
|
||
|
*/
|
||
|
static final int TYPE_UNINIT = 31;
|
||
|
|
||
|
/**
|
||
|
* Merged type Item stored in the ClassWriter {@link ClassWriter#typeTable},
|
||
|
* instead of the constant pool, in order to avoid clashes with normal
|
||
|
* constant pool items in the ClassWriter constant pool's hash table.
|
||
|
*/
|
||
|
static final int TYPE_MERGED = 32;
|
||
|
|
||
|
/**
|
||
|
* The type of BootstrapMethods items. These items are stored in a special
|
||
|
* class attribute named BootstrapMethods and not in the constant pool.
|
||
|
*/
|
||
|
static final int BSM = 33;
|
||
|
|
||
|
/**
|
||
|
* 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.
|
||
|
*/
|
||
|
final 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 {@link #items} hash table.
|
||
|
*/
|
||
|
final Item key;
|
||
|
|
||
|
/**
|
||
|
* A reusable key used to look for items in the {@link #items} hash table.
|
||
|
*/
|
||
|
final Item key2;
|
||
|
|
||
|
/**
|
||
|
* A reusable key used to look for items in the {@link #items} hash table.
|
||
|
*/
|
||
|
final Item key3;
|
||
|
|
||
|
/**
|
||
|
* A reusable key used to look for items in the {@link #items} hash table.
|
||
|
*/
|
||
|
final Item key4;
|
||
|
|
||
|
/**
|
||
|
* A type table used to temporarily store internal names that will not
|
||
|
* necessarily be stored in the constant pool. This type table is used by
|
||
|
* the control flow and data flow analysis algorithm used to compute stack
|
||
|
* map frames from scratch. This array associates to each index <tt>i</tt>
|
||
|
* the Item whose index is <tt>i</tt>. All Item objects stored in this array
|
||
|
* are also stored in the {@link #items} hash table. These two arrays allow
|
||
|
* to retrieve an Item from its index or, conversely, to get the index of an
|
||
|
* Item from its value. Each Item stores an internal name in its
|
||
|
* {@link Item#strVal1} field.
|
||
|
*/
|
||
|
Item[] typeTable;
|
||
|
|
||
|
/**
|
||
|
* Number of elements in the {@link #typeTable} array.
|
||
|
*/
|
||
|
private short typeCount;
|
||
|
|
||
|
/**
|
||
|
* 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 internal name of this class.
|
||
|
*/
|
||
|
String thisName;
|
||
|
|
||
|
/**
|
||
|
* 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 runtime visible type annotations of this class.
|
||
|
*/
|
||
|
private AnnotationWriter tanns;
|
||
|
|
||
|
/**
|
||
|
* The runtime invisible type annotations of this class.
|
||
|
*/
|
||
|
private AnnotationWriter itanns;
|
||
|
|
||
|
/**
|
||
|
* 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 number of entries in the BootstrapMethods attribute.
|
||
|
*/
|
||
|
int bootstrapMethodsCount;
|
||
|
|
||
|
/**
|
||
|
* The BootstrapMethods attribute.
|
||
|
*/
|
||
|
ByteVector bootstrapMethods;
|
||
|
|
||
|
/**
|
||
|
* 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#fv} 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#fv} 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#mv} 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#mv} 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;
|
||
|
|
||
|
/**
|
||
|
* <tt>true</tt> if the stack map frames must be recomputed from scratch.
|
||
|
*/
|
||
|
private boolean computeFrames;
|
||
|
|
||
|
/**
|
||
|
* <tt>true</tt> if the stack map tables of this class are invalid. The
|
||
|
* {@link MethodWriter#resizeInstructions} method cannot transform existing
|
||
|
* stack map tables, and so produces potentially invalid classes when it is
|
||
|
* executed. In this case the class is reread and rewritten with the
|
||
|
* {@link #COMPUTE_FRAMES} option (the resizeInstructions method can resize
|
||
|
* stack map tables when this option is used).
|
||
|
*/
|
||
|
boolean invalidFrames;
|
||
|
|
||
|
// ------------------------------------------------------------------------
|
||
|
// Static initializer
|
||
|
// ------------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Computes the instruction types of JVM opcodes.
|
||
|
*/
|
||
|
static {
|
||
|
int i;
|
||
|
byte[] b = new byte[220];
|
||
|
String s = "AAAAAAAAAAAAAAAABCLMMDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADD"
|
||
|
+ "DDDEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
|
||
|
+ "AAAAAAAAAAAAAAAAANAAAAAAAAAAAAAAAAAAAAJJJJJJJJJJJJJJJJDOPAA"
|
||
|
+ "AAAAGGGGGGGHIFBFAAFFAARQJJKKJJJJJJJJJJJJJJJJJJ";
|
||
|
for (i = 0; i < b.length; ++i) {
|
||
|
b[i] = (byte) (s.charAt(i) - 'A');
|
||
|
}
|
||
|
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;
|
||
|
// b[Constants.INVOKEDYNAMIC] = INDYMETH_INSN;
|
||
|
//
|
||
|
// // LABEL(W)_INSN instructions
|
||
|
// for (i = Constants.IFEQ; i <= Constants.JSR; ++i) {
|
||
|
// b[i] = LABEL_INSN;
|
||
|
// }
|
||
|
// b[Constants.IFNULL] = LABEL_INSN;
|
||
|
// b[Constants.IFNONNULL] = LABEL_INSN;
|
||
|
// b[200] = LABELW_INSN; // GOTO_W
|
||
|
// b[201] = LABELW_INSN; // JSR_W
|
||
|
// // temporary opcodes used internally by ASM - see Label and
|
||
|
// MethodWriter
|
||
|
// for (i = 202; i < 220; ++i) {
|
||
|
// b[i] = LABEL_INSN;
|
||
|
// }
|
||
|
//
|
||
|
// // LDC(_W) instructions
|
||
|
// b[Constants.LDC] = LDC_INSN;
|
||
|
// b[19] = LDCW_INSN; // LDC_W
|
||
|
// b[20] = LDCW_INSN; // LDC2_W
|
||
|
//
|
||
|
// // special instructions
|
||
|
// b[Constants.IINC] = IINC_INSN;
|
||
|
// b[Constants.TABLESWITCH] = TABL_INSN;
|
||
|
// b[Constants.LOOKUPSWITCH] = LOOK_INSN;
|
||
|
// b[Constants.MULTIANEWARRAY] = MANA_INSN;
|
||
|
// b[196] = WIDE_INSN; // WIDE
|
||
|
//
|
||
|
// for (i = 0; i < b.length; ++i) {
|
||
|
// System.err.print((char)('A' + b[i]));
|
||
|
// }
|
||
|
// System.err.println();
|
||
|
}
|
||
|
|
||
|
// ------------------------------------------------------------------------
|
||
|
// Constructor
|
||
|
// ------------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Constructs a new {@link ClassWriter} object.
|
||
|
*
|
||
|
* @param flags
|
||
|
* option flags that can be used to modify the default behavior
|
||
|
* of this class. See {@link #COMPUTE_MAXS},
|
||
|
* {@link #COMPUTE_FRAMES}.
|
||
|
*/
|
||
|
public ClassWriter(final int flags) {
|
||
|
super(Opcodes.ASM5);
|
||
|
index = 1;
|
||
|
pool = new ByteVector();
|
||
|
items = new Item[256];
|
||
|
threshold = (int) (0.75d * items.length);
|
||
|
key = new Item();
|
||
|
key2 = new Item();
|
||
|
key3 = new Item();
|
||
|
key4 = new Item();
|
||
|
this.computeMaxs = (flags & COMPUTE_MAXS) != 0;
|
||
|
this.computeFrames = (flags & COMPUTE_FRAMES) != 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Constructs a new {@link ClassWriter} object and enables optimizations for
|
||
|
* "mostly add" bytecode transformations. These optimizations are the
|
||
|
* following:
|
||
|
*
|
||
|
* <ul>
|
||
|
* <li>The constant pool from the original class is copied as is in the new
|
||
|
* class, which saves time. New constant pool entries will be added at the
|
||
|
* end if necessary, but unused constant pool entries <i>won't be
|
||
|
* removed</i>.</li>
|
||
|
* <li>Methods that are not transformed are copied as is in the new class,
|
||
|
* directly from the original class bytecode (i.e. without emitting visit
|
||
|
* events for all the method instructions), which saves a <i>lot</i> of
|
||
|
* time. Untransformed methods are detected by the fact that the
|
||
|
* {@link ClassReader} receives {@link MethodVisitor} objects that come from
|
||
|
* a {@link ClassWriter} (and not from any other {@link ClassVisitor}
|
||
|
* instance).</li>
|
||
|
* </ul>
|
||
|
*
|
||
|
* @param classReader
|
||
|
* the {@link ClassReader} used to read the original class. It
|
||
|
* will be used to copy the entire constant pool from the
|
||
|
* original class and also to copy other fragments of original
|
||
|
* bytecode where applicable.
|
||
|
* @param flags
|
||
|
* option flags that can be used to modify the default behavior
|
||
|
* of this class. <i>These option flags do not affect methods
|
||
|
* that are copied as is in the new class. This means that the
|
||
|
* maximum stack size nor the stack frames will be computed for
|
||
|
* these methods</i>. See {@link #COMPUTE_MAXS},
|
||
|
* {@link #COMPUTE_FRAMES}.
|
||
|
*/
|
||
|
public ClassWriter(final ClassReader classReader, final int flags) {
|
||
|
this(flags);
|
||
|
classReader.copyPool(this);
|
||
|
this.cr = classReader;
|
||
|
}
|
||
|
|
||
|
// ------------------------------------------------------------------------
|
||
|
// Implementation of the ClassVisitor abstract class
|
||
|
// ------------------------------------------------------------------------
|
||
|
|
||
|
@Override
|
||
|
public final void visit(final int version, final int access,
|
||
|
final String name, final String signature, final String superName,
|
||
|
final String[] interfaces) {
|
||
|
this.version = version;
|
||
|
this.access = access;
|
||
|
this.name = newClass(name);
|
||
|
thisName = name;
|
||
|
if (ClassReader.SIGNATURES && signature != null) {
|
||
|
this.signature = newUTF8(signature);
|
||
|
}
|
||
|
this.superName = superName == null ? 0 : newClass(superName);
|
||
|
if (interfaces != null && interfaces.length > 0) {
|
||
|
interfaceCount = interfaces.length;
|
||
|
this.interfaces = new int[interfaceCount];
|
||
|
for (int i = 0; i < interfaceCount; ++i) {
|
||
|
this.interfaces[i] = newClass(interfaces[i]);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final void visitSource(final String file, final String debug) {
|
||
|
if (file != null) {
|
||
|
sourceFile = newUTF8(file);
|
||
|
}
|
||
|
if (debug != null) {
|
||
|
sourceDebug = new ByteVector().encodeUTF8(debug, 0,
|
||
|
Integer.MAX_VALUE);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final void visitOuterClass(final String owner, final String name,
|
||
|
final String desc) {
|
||
|
enclosingMethodOwner = newClass(owner);
|
||
|
if (name != null && desc != null) {
|
||
|
enclosingMethod = newNameType(name, desc);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final AnnotationVisitor visitAnnotation(final String desc,
|
||
|
final boolean visible) {
|
||
|
if (!ClassReader.ANNOTATIONS) {
|
||
|
return null;
|
||
|
}
|
||
|
ByteVector bv = new ByteVector();
|
||
|
// write type, and reserve space for values count
|
||
|
bv.putShort(newUTF8(desc)).putShort(0);
|
||
|
AnnotationWriter aw = new AnnotationWriter(this, true, bv, bv, 2);
|
||
|
if (visible) {
|
||
|
aw.next = anns;
|
||
|
anns = aw;
|
||
|
} else {
|
||
|
aw.next = ianns;
|
||
|
ianns = aw;
|
||
|
}
|
||
|
return aw;
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final AnnotationVisitor visitTypeAnnotation(int typeRef,
|
||
|
TypePath typePath, final String desc, final boolean visible) {
|
||
|
if (!ClassReader.ANNOTATIONS) {
|
||
|
return null;
|
||
|
}
|
||
|
ByteVector bv = new ByteVector();
|
||
|
// write target_type and target_info
|
||
|
AnnotationWriter.putTarget(typeRef, typePath, bv);
|
||
|
// write type, and reserve space for values count
|
||
|
bv.putShort(newUTF8(desc)).putShort(0);
|
||
|
AnnotationWriter aw = new AnnotationWriter(this, true, bv, bv,
|
||
|
bv.length - 2);
|
||
|
if (visible) {
|
||
|
aw.next = tanns;
|
||
|
tanns = aw;
|
||
|
} else {
|
||
|
aw.next = itanns;
|
||
|
itanns = aw;
|
||
|
}
|
||
|
return aw;
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final void visitAttribute(final Attribute attr) {
|
||
|
attr.next = attrs;
|
||
|
attrs = attr;
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final void visitInnerClass(final String name,
|
||
|
final String outerName, final String innerName, final int access) {
|
||
|
if (innerClasses == null) {
|
||
|
innerClasses = new ByteVector();
|
||
|
}
|
||
|
// Sec. 4.7.6 of the JVMS states "Every CONSTANT_Class_info entry in the
|
||
|
// constant_pool table which represents a class or interface C that is
|
||
|
// not a package member must have exactly one corresponding entry in the
|
||
|
// classes array". To avoid duplicates we keep track in the intVal field
|
||
|
// of the Item of each CONSTANT_Class_info entry C whether an inner
|
||
|
// class entry has already been added for C (this field is unused for
|
||
|
// class entries, and changing its value does not change the hashcode
|
||
|
// and equality tests). If so we store the index of this inner class
|
||
|
// entry (plus one) in intVal. This hack allows duplicate detection in
|
||
|
// O(1) time.
|
||
|
Item nameItem = newClassItem(name);
|
||
|
if (nameItem.intVal == 0) {
|
||
|
++innerClassesCount;
|
||
|
innerClasses.putShort(nameItem.index);
|
||
|
innerClasses.putShort(outerName == null ? 0 : newClass(outerName));
|
||
|
innerClasses.putShort(innerName == null ? 0 : newUTF8(innerName));
|
||
|
innerClasses.putShort(access);
|
||
|
nameItem.intVal = innerClassesCount;
|
||
|
} else {
|
||
|
// Compare the inner classes entry nameItem.intVal - 1 with the
|
||
|
// arguments of this method and throw an exception if there is a
|
||
|
// difference?
|
||
|
}
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final FieldVisitor visitField(final int access, final String name,
|
||
|
final String desc, final String signature, final Object value) {
|
||
|
return new FieldWriter(this, access, name, desc, signature, value);
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final MethodVisitor visitMethod(final int access, final String name,
|
||
|
final String desc, final String signature, final String[] exceptions) {
|
||
|
return new MethodWriter(this, access, name, desc, signature,
|
||
|
exceptions, computeMaxs, computeFrames);
|
||
|
}
|
||
|
|
||
|
@Override
|
||
|
public final 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() {
|
||
|
if (index > 0xFFFF) {
|
||
|
throw new RuntimeException("Class file too large!");
|
||
|
}
|
||
|
// computes the real size of the bytecode of this class
|
||
|
int size = 24 + 2 * interfaceCount;
|
||
|
int nbFields = 0;
|
||
|
FieldWriter fb = firstField;
|
||
|
while (fb != null) {
|
||
|
++nbFields;
|
||
|
size += fb.getSize();
|
||
|
fb = (FieldWriter) fb.fv;
|
||
|
}
|
||
|
int nbMethods = 0;
|
||
|
MethodWriter mb = firstMethod;
|
||
|
while (mb != null) {
|
||
|
++nbMethods;
|
||
|
size += mb.getSize();
|
||
|
mb = (MethodWriter) mb.mv;
|
||
|
}
|
||
|
int attributeCount = 0;
|
||
|
if (bootstrapMethods != null) {
|
||
|
// we put it as first attribute in order to improve a bit
|
||
|
// ClassReader.copyBootstrapMethods
|
||
|
++attributeCount;
|
||
|
size += 8 + bootstrapMethods.length;
|
||
|
newUTF8("BootstrapMethods");
|
||
|
}
|
||
|
if (ClassReader.SIGNATURES && signature != 0) {
|
||
|
++attributeCount;
|
||
|
size += 8;
|
||
|
newUTF8("Signature");
|
||
|
}
|
||
|
if (sourceFile != 0) {
|
||
|
++attributeCount;
|
||
|
size += 8;
|
||
|
newUTF8("SourceFile");
|
||
|
}
|
||
|
if (sourceDebug != null) {
|
||
|
++attributeCount;
|
||
|
size += sourceDebug.length + 6;
|
||
|
newUTF8("SourceDebugExtension");
|
||
|
}
|
||
|
if (enclosingMethodOwner != 0) {
|
||
|
++attributeCount;
|
||
|
size += 10;
|
||
|
newUTF8("EnclosingMethod");
|
||
|
}
|
||
|
if ((access & Opcodes.ACC_DEPRECATED) != 0) {
|
||
|
++attributeCount;
|
||
|
size += 6;
|
||
|
newUTF8("Deprecated");
|
||
|
}
|
||
|
if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
|
||
|
if ((version & 0xFFFF) < Opcodes.V1_5
|
||
|
|| (access & ACC_SYNTHETIC_ATTRIBUTE) != 0) {
|
||
|
++attributeCount;
|
||
|
size += 6;
|
||
|
newUTF8("Synthetic");
|
||
|
}
|
||
|
}
|
||
|
if (innerClasses != null) {
|
||
|
++attributeCount;
|
||
|
size += 8 + innerClasses.length;
|
||
|
newUTF8("InnerClasses");
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && anns != null) {
|
||
|
++attributeCount;
|
||
|
size += 8 + anns.getSize();
|
||
|
newUTF8("RuntimeVisibleAnnotations");
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && ianns != null) {
|
||
|
++attributeCount;
|
||
|
size += 8 + ianns.getSize();
|
||
|
newUTF8("RuntimeInvisibleAnnotations");
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && tanns != null) {
|
||
|
++attributeCount;
|
||
|
size += 8 + tanns.getSize();
|
||
|
newUTF8("RuntimeVisibleTypeAnnotations");
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && itanns != null) {
|
||
|
++attributeCount;
|
||
|
size += 8 + itanns.getSize();
|
||
|
newUTF8("RuntimeInvisibleTypeAnnotations");
|
||
|
}
|
||
|
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);
|
||
|
int mask = Opcodes.ACC_DEPRECATED | ACC_SYNTHETIC_ATTRIBUTE
|
||
|
| ((access & ACC_SYNTHETIC_ATTRIBUTE) / TO_ACC_SYNTHETIC);
|
||
|
out.putShort(access & ~mask).putShort(name).putShort(superName);
|
||
|
out.putShort(interfaceCount);
|
||
|
for (int i = 0; i < interfaceCount; ++i) {
|
||
|
out.putShort(interfaces[i]);
|
||
|
}
|
||
|
out.putShort(nbFields);
|
||
|
fb = firstField;
|
||
|
while (fb != null) {
|
||
|
fb.put(out);
|
||
|
fb = (FieldWriter) fb.fv;
|
||
|
}
|
||
|
out.putShort(nbMethods);
|
||
|
mb = firstMethod;
|
||
|
while (mb != null) {
|
||
|
mb.put(out);
|
||
|
mb = (MethodWriter) mb.mv;
|
||
|
}
|
||
|
out.putShort(attributeCount);
|
||
|
if (bootstrapMethods != null) {
|
||
|
out.putShort(newUTF8("BootstrapMethods"));
|
||
|
out.putInt(bootstrapMethods.length + 2).putShort(
|
||
|
bootstrapMethodsCount);
|
||
|
out.putByteArray(bootstrapMethods.data, 0, bootstrapMethods.length);
|
||
|
}
|
||
|
if (ClassReader.SIGNATURES && signature != 0) {
|
||
|
out.putShort(newUTF8("Signature")).putInt(2).putShort(signature);
|
||
|
}
|
||
|
if (sourceFile != 0) {
|
||
|
out.putShort(newUTF8("SourceFile")).putInt(2).putShort(sourceFile);
|
||
|
}
|
||
|
if (sourceDebug != null) {
|
||
|
int len = sourceDebug.length;
|
||
|
out.putShort(newUTF8("SourceDebugExtension")).putInt(len);
|
||
|
out.putByteArray(sourceDebug.data, 0, len);
|
||
|
}
|
||
|
if (enclosingMethodOwner != 0) {
|
||
|
out.putShort(newUTF8("EnclosingMethod")).putInt(4);
|
||
|
out.putShort(enclosingMethodOwner).putShort(enclosingMethod);
|
||
|
}
|
||
|
if ((access & Opcodes.ACC_DEPRECATED) != 0) {
|
||
|
out.putShort(newUTF8("Deprecated")).putInt(0);
|
||
|
}
|
||
|
if ((access & Opcodes.ACC_SYNTHETIC) != 0) {
|
||
|
if ((version & 0xFFFF) < Opcodes.V1_5
|
||
|
|| (access & ACC_SYNTHETIC_ATTRIBUTE) != 0) {
|
||
|
out.putShort(newUTF8("Synthetic")).putInt(0);
|
||
|
}
|
||
|
}
|
||
|
if (innerClasses != null) {
|
||
|
out.putShort(newUTF8("InnerClasses"));
|
||
|
out.putInt(innerClasses.length + 2).putShort(innerClassesCount);
|
||
|
out.putByteArray(innerClasses.data, 0, innerClasses.length);
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && anns != null) {
|
||
|
out.putShort(newUTF8("RuntimeVisibleAnnotations"));
|
||
|
anns.put(out);
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && ianns != null) {
|
||
|
out.putShort(newUTF8("RuntimeInvisibleAnnotations"));
|
||
|
ianns.put(out);
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && tanns != null) {
|
||
|
out.putShort(newUTF8("RuntimeVisibleTypeAnnotations"));
|
||
|
tanns.put(out);
|
||
|
}
|
||
|
if (ClassReader.ANNOTATIONS && itanns != null) {
|
||
|
out.putShort(newUTF8("RuntimeInvisibleTypeAnnotations"));
|
||
|
itanns.put(out);
|
||
|
}
|
||
|
if (attrs != null) {
|
||
|
attrs.put(this, null, 0, -1, -1, out);
|
||
|
}
|
||
|
if (invalidFrames) {
|
||
|
anns = null;
|
||
|
ianns = null;
|
||
|
attrs = null;
|
||
|
innerClassesCount = 0;
|
||
|
innerClasses = null;
|
||
|
bootstrapMethodsCount = 0;
|
||
|
bootstrapMethods = null;
|
||
|
firstField = null;
|
||
|
lastField = null;
|
||
|
firstMethod = null;
|
||
|
lastMethod = null;
|
||
|
computeMaxs = false;
|
||
|
computeFrames = true;
|
||
|
invalidFrames = false;
|
||
|
new ClassReader(out.data).accept(this, ClassReader.SKIP_FRAMES);
|
||
|
return toByteArray();
|
||
|
}
|
||
|
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 Integer}, a {@link Float}, a
|
||
|
* {@link Long}, a {@link Double}, a {@link String} or a
|
||
|
* {@link Type}.
|
||
|
* @return a new or already existing constant item with the given value.
|
||
|
*/
|
||
|
Item newConstItem(final Object cst) {
|
||
|
if (cst instanceof Integer) {
|
||
|
int val = ((Integer) cst).intValue();
|
||
|
return newInteger(val);
|
||
|
} else if (cst instanceof Byte) {
|
||
|
int val = ((Byte) cst).intValue();
|
||
|
return newInteger(val);
|
||
|
} else if (cst instanceof Character) {
|
||
|
int val = ((Character) cst).charValue();
|
||
|
return newInteger(val);
|
||
|
} else if (cst instanceof Short) {
|
||
|
int val = ((Short) cst).intValue();
|
||
|
return newInteger(val);
|
||
|
} else if (cst instanceof Boolean) {
|
||
|
int val = ((Boolean) cst).booleanValue() ? 1 : 0;
|
||
|
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 if (cst instanceof Type) {
|
||
|
Type t = (Type) cst;
|
||
|
int s = t.getSort();
|
||
|
if (s == Type.OBJECT) {
|
||
|
return newClassItem(t.getInternalName());
|
||
|
} else if (s == Type.METHOD) {
|
||
|
return newMethodTypeItem(t.getDescriptor());
|
||
|
} else { // s == primitive type or array
|
||
|
return newClassItem(t.getDescriptor());
|
||
|
}
|
||
|
} else if (cst instanceof Handle) {
|
||
|
Handle h = (Handle) cst;
|
||
|
return newHandleItem(h.tag, h.owner, h.name, h.desc);
|
||
|
} 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 Integer}, a {@link Float}, a
|
||
|
* {@link Long}, a {@link Double} or a {@link String}.
|
||
|
* @return the index of a new or already existing constant item with the
|
||
|
* given value.
|
||
|
*/
|
||
|
public int newConst(final Object cst) {
|
||
|
return newConstItem(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 a new or already existing class reference item.
|
||
|
*/
|
||
|
Item newClassItem(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;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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) {
|
||
|
return newClassItem(value).index;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds a method type 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 methodDesc
|
||
|
* method descriptor of the method type.
|
||
|
* @return a new or already existing method type reference item.
|
||
|
*/
|
||
|
Item newMethodTypeItem(final String methodDesc) {
|
||
|
key2.set(MTYPE, methodDesc, null, null);
|
||
|
Item result = get(key2);
|
||
|
if (result == null) {
|
||
|
pool.put12(MTYPE, newUTF8(methodDesc));
|
||
|
result = new Item(index++, key2);
|
||
|
put(result);
|
||
|
}
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds a method type 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 methodDesc
|
||
|
* method descriptor of the method type.
|
||
|
* @return the index of a new or already existing method type reference
|
||
|
* item.
|
||
|
*/
|
||
|
public int newMethodType(final String methodDesc) {
|
||
|
return newMethodTypeItem(methodDesc).index;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds a handle 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 tag
|
||
|
* the kind of this handle. Must be {@link Opcodes#H_GETFIELD},
|
||
|
* {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD},
|
||
|
* {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL},
|
||
|
* {@link Opcodes#H_INVOKESTATIC},
|
||
|
* {@link Opcodes#H_INVOKESPECIAL},
|
||
|
* {@link Opcodes#H_NEWINVOKESPECIAL} or
|
||
|
* {@link Opcodes#H_INVOKEINTERFACE}.
|
||
|
* @param owner
|
||
|
* the internal name of the field or method owner class.
|
||
|
* @param name
|
||
|
* the name of the field or method.
|
||
|
* @param desc
|
||
|
* the descriptor of the field or method.
|
||
|
* @return a new or an already existing method type reference item.
|
||
|
*/
|
||
|
Item newHandleItem(final int tag, final String owner, final String name,
|
||
|
final String desc) {
|
||
|
key4.set(HANDLE_BASE + tag, owner, name, desc);
|
||
|
Item result = get(key4);
|
||
|
if (result == null) {
|
||
|
if (tag <= Opcodes.H_PUTSTATIC) {
|
||
|
put112(HANDLE, tag, newField(owner, name, desc));
|
||
|
} else {
|
||
|
put112(HANDLE,
|
||
|
tag,
|
||
|
newMethod(owner, name, desc,
|
||
|
tag == Opcodes.H_INVOKEINTERFACE));
|
||
|
}
|
||
|
result = new Item(index++, key4);
|
||
|
put(result);
|
||
|
}
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds a handle 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 tag
|
||
|
* the kind of this handle. Must be {@link Opcodes#H_GETFIELD},
|
||
|
* {@link Opcodes#H_GETSTATIC}, {@link Opcodes#H_PUTFIELD},
|
||
|
* {@link Opcodes#H_PUTSTATIC}, {@link Opcodes#H_INVOKEVIRTUAL},
|
||
|
* {@link Opcodes#H_INVOKESTATIC},
|
||
|
* {@link Opcodes#H_INVOKESPECIAL},
|
||
|
* {@link Opcodes#H_NEWINVOKESPECIAL} or
|
||
|
* {@link Opcodes#H_INVOKEINTERFACE}.
|
||
|
* @param owner
|
||
|
* the internal name of the field or method owner class.
|
||
|
* @param name
|
||
|
* the name of the field or method.
|
||
|
* @param desc
|
||
|
* the descriptor of the field or method.
|
||
|
* @return the index of a new or already existing method type reference
|
||
|
* item.
|
||
|
*/
|
||
|
public int newHandle(final int tag, final String owner, final String name,
|
||
|
final String desc) {
|
||
|
return newHandleItem(tag, owner, name, desc).index;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds an invokedynamic 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 name
|
||
|
* name of the invoked method.
|
||
|
* @param desc
|
||
|
* descriptor of the invoke method.
|
||
|
* @param bsm
|
||
|
* the bootstrap method.
|
||
|
* @param bsmArgs
|
||
|
* the bootstrap method constant arguments.
|
||
|
*
|
||
|
* @return a new or an already existing invokedynamic type reference item.
|
||
|
*/
|
||
|
Item newInvokeDynamicItem(final String name, final String desc,
|
||
|
final Handle bsm, final Object... bsmArgs) {
|
||
|
// cache for performance
|
||
|
ByteVector bootstrapMethods = this.bootstrapMethods;
|
||
|
if (bootstrapMethods == null) {
|
||
|
bootstrapMethods = this.bootstrapMethods = new ByteVector();
|
||
|
}
|
||
|
|
||
|
int position = bootstrapMethods.length; // record current position
|
||
|
|
||
|
int hashCode = bsm.hashCode();
|
||
|
bootstrapMethods.putShort(newHandle(bsm.tag, bsm.owner, bsm.name,
|
||
|
bsm.desc));
|
||
|
|
||
|
int argsLength = bsmArgs.length;
|
||
|
bootstrapMethods.putShort(argsLength);
|
||
|
|
||
|
for (int i = 0; i < argsLength; i++) {
|
||
|
Object bsmArg = bsmArgs[i];
|
||
|
hashCode ^= bsmArg.hashCode();
|
||
|
bootstrapMethods.putShort(newConst(bsmArg));
|
||
|
}
|
||
|
|
||
|
byte[] data = bootstrapMethods.data;
|
||
|
int length = (1 + 1 + argsLength) << 1; // (bsm + argCount + arguments)
|
||
|
hashCode &= 0x7FFFFFFF;
|
||
|
Item result = items[hashCode % items.length];
|
||
|
loop: while (result != null) {
|
||
|
if (result.type != BSM || result.hashCode != hashCode) {
|
||
|
result = result.next;
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
// because the data encode the size of the argument
|
||
|
// we don't need to test if these size are equals
|
||
|
int resultPosition = result.intVal;
|
||
|
for (int p = 0; p < length; p++) {
|
||
|
if (data[position + p] != data[resultPosition + p]) {
|
||
|
result = result.next;
|
||
|
continue loop;
|
||
|
}
|
||
|
}
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
int bootstrapMethodIndex;
|
||
|
if (result != null) {
|
||
|
bootstrapMethodIndex = result.index;
|
||
|
bootstrapMethods.length = position; // revert to old position
|
||
|
} else {
|
||
|
bootstrapMethodIndex = bootstrapMethodsCount++;
|
||
|
result = new Item(bootstrapMethodIndex);
|
||
|
result.set(position, hashCode);
|
||
|
put(result);
|
||
|
}
|
||
|
|
||
|
// now, create the InvokeDynamic constant
|
||
|
key3.set(name, desc, bootstrapMethodIndex);
|
||
|
result = get(key3);
|
||
|
if (result == null) {
|
||
|
put122(INDY, bootstrapMethodIndex, newNameType(name, desc));
|
||
|
result = new Item(index++, key3);
|
||
|
put(result);
|
||
|
}
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds an invokedynamic 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 name
|
||
|
* name of the invoked method.
|
||
|
* @param desc
|
||
|
* descriptor of the invoke method.
|
||
|
* @param bsm
|
||
|
* the bootstrap method.
|
||
|
* @param bsmArgs
|
||
|
* the bootstrap method constant arguments.
|
||
|
*
|
||
|
* @return the index of a new or already existing invokedynamic reference
|
||
|
* item.
|
||
|
*/
|
||
|
public int newInvokeDynamic(final String name, final String desc,
|
||
|
final Handle bsm, final Object... bsmArgs) {
|
||
|
return newInvokeDynamicItem(name, desc, bsm, bsmArgs).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.
|
||
|
*
|
||
|
* @param owner
|
||
|
* the internal name of the field's owner class.
|
||
|
* @param name
|
||
|
* the field's name.
|
||
|
* @param desc
|
||
|
* the field's descriptor.
|
||
|
* @return a new or already existing field reference item.
|
||
|
*/
|
||
|
Item newFieldItem(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;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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) {
|
||
|
return newFieldItem(owner, name, desc).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) {
|
||
|
int type = itf ? IMETH : METH;
|
||
|
key3.set(type, owner, name, desc);
|
||
|
Item result = get(key3);
|
||
|
if (result == null) {
|
||
|
put122(type, 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.
|
||
|
*/
|
||
|
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.
|
||
|
*/
|
||
|
Item newFloat(final float value) {
|
||
|
key.set(value);
|
||
|
Item result = get(key);
|
||
|
if (result == null) {
|
||
|
pool.putByte(FLOAT).putInt(key.intVal);
|
||
|
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.
|
||
|
*/
|
||
|
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);
|
||
|
index += 2;
|
||
|
put(result);
|
||
|
}
|
||
|
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.
|
||
|
*/
|
||
|
Item newDouble(final double value) {
|
||
|
key.set(value);
|
||
|
Item result = get(key);
|
||
|
if (result == null) {
|
||
|
pool.putByte(DOUBLE).putLong(key.longVal);
|
||
|
result = new Item(index, key);
|
||
|
index += 2;
|
||
|
put(result);
|
||
|
}
|
||
|
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. <i>This
|
||
|
* method is intended for {@link Attribute} sub classes, and is normally not
|
||
|
* needed by class generators or adapters.</i>
|
||
|
*
|
||
|
* @param name
|
||
|
* a name.
|
||
|
* @param desc
|
||
|
* a type descriptor.
|
||
|
* @return the index of a new or already existing name and type item.
|
||
|
*/
|
||
|
public int newNameType(final String name, final String desc) {
|
||
|
return newNameTypeItem(name, desc).index;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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 a new or already existing name and type item.
|
||
|
*/
|
||
|
Item newNameTypeItem(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;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds the given internal name to {@link #typeTable} and returns its index.
|
||
|
* Does nothing if the type table already contains this internal name.
|
||
|
*
|
||
|
* @param type
|
||
|
* the internal name to be added to the type table.
|
||
|
* @return the index of this internal name in the type table.
|
||
|
*/
|
||
|
int addType(final String type) {
|
||
|
key.set(TYPE_NORMAL, type, null, null);
|
||
|
Item result = get(key);
|
||
|
if (result == null) {
|
||
|
result = addType(key);
|
||
|
}
|
||
|
return result.index;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds the given "uninitialized" type to {@link #typeTable} and returns its
|
||
|
* index. This method is used for UNINITIALIZED types, made of an internal
|
||
|
* name and a bytecode offset.
|
||
|
*
|
||
|
* @param type
|
||
|
* the internal name to be added to the type table.
|
||
|
* @param offset
|
||
|
* the bytecode offset of the NEW instruction that created this
|
||
|
* UNINITIALIZED type value.
|
||
|
* @return the index of this internal name in the type table.
|
||
|
*/
|
||
|
int addUninitializedType(final String type, final int offset) {
|
||
|
key.type = TYPE_UNINIT;
|
||
|
key.intVal = offset;
|
||
|
key.strVal1 = type;
|
||
|
key.hashCode = 0x7FFFFFFF & (TYPE_UNINIT + type.hashCode() + offset);
|
||
|
Item result = get(key);
|
||
|
if (result == null) {
|
||
|
result = addType(key);
|
||
|
}
|
||
|
return result.index;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Adds the given Item to {@link #typeTable}.
|
||
|
*
|
||
|
* @param item
|
||
|
* the value to be added to the type table.
|
||
|
* @return the added Item, which a new Item instance with the same value as
|
||
|
* the given Item.
|
||
|
*/
|
||
|
private Item addType(final Item item) {
|
||
|
++typeCount;
|
||
|
Item result = new Item(typeCount, key);
|
||
|
put(result);
|
||
|
if (typeTable == null) {
|
||
|
typeTable = new Item[16];
|
||
|
}
|
||
|
if (typeCount == typeTable.length) {
|
||
|
Item[] newTable = new Item[2 * typeTable.length];
|
||
|
System.arraycopy(typeTable, 0, newTable, 0, typeTable.length);
|
||
|
typeTable = newTable;
|
||
|
}
|
||
|
typeTable[typeCount] = result;
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Returns the index of the common super type of the two given types. This
|
||
|
* method calls {@link #getCommonSuperClass} and caches the result in the
|
||
|
* {@link #items} hash table to speedup future calls with the same
|
||
|
* parameters.
|
||
|
*
|
||
|
* @param type1
|
||
|
* index of an internal name in {@link #typeTable}.
|
||
|
* @param type2
|
||
|
* index of an internal name in {@link #typeTable}.
|
||
|
* @return the index of the common super type of the two given types.
|
||
|
*/
|
||
|
int getMergedType(final int type1, final int type2) {
|
||
|
key2.type = TYPE_MERGED;
|
||
|
key2.longVal = type1 | (((long) type2) << 32);
|
||
|
key2.hashCode = 0x7FFFFFFF & (TYPE_MERGED + type1 + type2);
|
||
|
Item result = get(key2);
|
||
|
if (result == null) {
|
||
|
String t = typeTable[type1].strVal1;
|
||
|
String u = typeTable[type2].strVal1;
|
||
|
key2.intVal = addType(getCommonSuperClass(t, u));
|
||
|
result = new Item((short) 0, key2);
|
||
|
put(result);
|
||
|
}
|
||
|
return result.intVal;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Returns the common super type of the two given types. The default
|
||
|
* implementation of this method <i>loads</i> the two given classes and uses
|
||
|
* the java.lang.Class methods to find the common super class. It can be
|
||
|
* overridden to compute this common super type in other ways, in particular
|
||
|
* without actually loading any class, or to take into account the class
|
||
|
* that is currently being generated by this ClassWriter, which can of
|
||
|
* course not be loaded since it is under construction.
|
||
|
*
|
||
|
* @param type1
|
||
|
* the internal name of a class.
|
||
|
* @param type2
|
||
|
* the internal name of another class.
|
||
|
* @return the internal name of the common super class of the two given
|
||
|
* classes.
|
||
|
*/
|
||
|
protected String getCommonSuperClass(final String type1, final String type2) {
|
||
|
Class<?> c, d;
|
||
|
ClassLoader classLoader = getClass().getClassLoader();
|
||
|
try {
|
||
|
c = Class.forName(type1.replace('/', '.'), false, classLoader);
|
||
|
d = Class.forName(type2.replace('/', '.'), false, classLoader);
|
||
|
} catch (Exception e) {
|
||
|
throw new RuntimeException(e.toString());
|
||
|
}
|
||
|
if (c.isAssignableFrom(d)) {
|
||
|
return type1;
|
||
|
}
|
||
|
if (d.isAssignableFrom(c)) {
|
||
|
return type2;
|
||
|
}
|
||
|
if (c.isInterface() || d.isInterface()) {
|
||
|
return "java/lang/Object";
|
||
|
} else {
|
||
|
do {
|
||
|
c = c.getSuperclass();
|
||
|
} while (!c.isAssignableFrom(d));
|
||
|
return c.getName().replace('.', '/');
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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) {
|
||
|
Item i = items[key.hashCode % items.length];
|
||
|
while (i != null && (i.type != key.type || !key.isEqualTo(i))) {
|
||
|
i = i.next;
|
||
|
}
|
||
|
return i;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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 + typeCount > threshold) {
|
||
|
int ll = items.length;
|
||
|
int nl = ll * 2 + 1;
|
||
|
Item[] newItems = new Item[nl];
|
||
|
for (int l = ll - 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) (nl * 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);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Puts two bytes and one short into the constant pool.
|
||
|
*
|
||
|
* @param b1
|
||
|
* a byte.
|
||
|
* @param b2
|
||
|
* another byte.
|
||
|
* @param s
|
||
|
* a short.
|
||
|
*/
|
||
|
private void put112(final int b1, final int b2, final int s) {
|
||
|
pool.put11(b1, b2).putShort(s);
|
||
|
}
|
||
|
}
|