/***
* 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.springframework.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, COMPUTE_FRAMES implies
* COMPUTE_MAXS.
*
* @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 type of the ASM pseudo instructions with an unsigned 2 bytes offset
* label (see Label#resolve).
*/
static final int
ASM_LABEL_INSN = 18;
/**
* The type of the ASM pseudo instructions with a 4 bytes offset label.
*/
static final int
ASM_LABELW_INSN = 19;
/**
* Represents a frame inserted between already existing frames. This kind of
* frame can only be used if the frame content can be computed from the
* previous existing frame and from the instructions between this existing
* frame and the inserted one, without any knowledge of the type hierarchy.
* This kind of frame is only used when an unconditional jump is inserted in
* a method while expanding an ASM pseudo instruction (see ClassReader).
*/
static final int
F_INSERT = 256;
/**
* 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 type of CONSTANT_Module constant pool items.
*/
static final int
MODULE = 19;
/**
* The type of CONSTANT_Package constant pool items.
*/
static final int
PACKAGE = 20;
/**
* The base value for all CONSTANT_MethodHandle constant pool items.
* Internally, ASM store the 9 variations of CONSTANT_MethodHandle into 9
* different items (from 21 to 29).
*/
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 module attribute of this class.
*/
private
ModuleWriter moduleWriter;
/**
* 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;
/**
* Indicates what must be automatically computed.
*
* @see MethodWriter#compute
*/
private int
compute;
/**
* <tt>true</tt> if some methods have wide forward jumps using ASM pseudo
* instructions, which need to be expanded into sequences of standard
* bytecode instructions. In this case the class is re-read and re-written
* with a ClassReader -> ClassWriter chain to perform this transformation.
*/
boolean
hasAsmInsns;
// ------------------------------------------------------------------------
// Static initializer
// ------------------------------------------------------------------------
/**
* Computes the instruction types of JVM opcodes.
*/
static {
int
i;
byte[]
b = new byte[221];
String s = "AAAAAAAAAAAAAAAABCLMMDDDDDEEEEEEEEEEEEEEEEEEEEAAAAAAAADD"
+ "DDDEEEEEEEEEEEEEEEEEEEEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAANAAAAAAAAAAAAAAAAAAAAJJJJJJJJJJJJJJJJDOPAA"
+ "AAAAGGGGGGGHIFBFAAFFAARQJJKKSSSSSSSSSSSSSSSSSST";
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] = ASM_LABEL_INSN;
// }
// b[220] = ASM_LABELW_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.
ASM6);
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.
compute = (
flags &
COMPUTE_FRAMES) != 0 ?
MethodWriter.
FRAMES
: ((
flags &
COMPUTE_MAXS) != 0 ?
MethodWriter.
MAXS
:
MethodWriter.
NOTHING);
}
/**
* 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
* neither 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
ModuleVisitor visitModule(final
String name,
final int
access, final
String version) {
return
moduleWriter = new
ModuleWriter(this,
newModule(
name),
access,
version == null ? 0 :
newUTF8(
version));
}
@
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 =
newStringishItem(
CLASS,
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,
compute);
}
@
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 (
moduleWriter != null) {
attributeCount += 1 +
moduleWriter.
attributeCount;
size += 6 +
moduleWriter.
size +
moduleWriter.
attributesSize;
newUTF8("Module");
}
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 (
moduleWriter != null) {
out.
putShort(
newUTF8("Module"));
moduleWriter.
put(
out);
moduleWriter.
putAttributes(
out);
}
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 (
hasAsmInsns) {
boolean
hasFrames = false;
mb =
firstMethod;
while (
mb != null) {
hasFrames |=
mb.
frameCount > 0;
mb = (
MethodWriter)
mb.
mv;
}
anns = null;
ianns = null;
attrs = null;
moduleWriter = null;
innerClassesCount = 0;
innerClasses = null;
firstField = null;
lastField = null;
firstMethod = null;
lastMethod = null;
compute =
hasFrames ?
MethodWriter.
INSERTED_FRAMES : 0;
hasAsmInsns = false;
new
ClassReader(
out.
data).
accept(this,
(
hasFrames ?
ClassReader.
EXPAND_FRAMES : 0)
|
ClassReader.
EXPAND_ASM_INSNS);
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
newStringishItem(
STR, (
String)
cst);
} else if (
cst instanceof
Type) {
Type t = (
Type)
cst;
int
s =
t.
getSort();
if (
s ==
Type.
OBJECT) {
return
newStringishItem(
CLASS,
t.
getInternalName());
} else if (
s ==
Type.
METHOD) {
return
newStringishItem(
MTYPE,
t.
getDescriptor());
} else { // s == primitive type or array
return
newStringishItem(
CLASS,
t.
getDescriptor());
}
} else if (
cst instanceof
Handle) {
Handle h = (
Handle)
cst;
return
newHandleItem(
h.
tag,
h.
owner,
h.
name,
h.
desc,
h.
itf);
} 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 string reference, a class reference, a method type, a module
* or a package to the constant pool of the class being build.
* Does nothing if the constant pool already contains a similar item.
*
* @param type
* a type among STR, CLASS, MTYPE, MODULE or PACKAGE
* @param value
* string value of the reference.
* @return a new or already existing reference item.
*/
Item newStringishItem(final int
type, final
String value) {
key2.
set(
type,
value, null, null);
Item result =
get(
key2);
if (
result == null) {
pool.
put12(
type,
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
newStringishItem(
CLASS,
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 the index of a new or already existing method type reference
* item.
*/
public int
newMethodType(final
String methodDesc) {
return
newStringishItem(
MTYPE,
methodDesc).
index;
}
/**
* Adds a module 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 moduleName
* name of the module.
* @return the index of a new or already existing module reference
* item.
*/
public int
newModule(final
String moduleName) {
return
newStringishItem(
MODULE,
moduleName).
index;
}
/**
* Adds a package 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 packageName
* name of the package in its internal form.
* @return the index of a new or already existing module reference
* item.
*/
public int
newPackage(final
String packageName) {
return
newStringishItem(
PACKAGE,
packageName).
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.
* @param itf
* true if the owner is an interface.
* @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, final boolean
itf) {
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,
itf));
}
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.
*
* @deprecated this method is superseded by
* {@link #newHandle(int, String, String, String, boolean)}.
*/
@
Deprecated
public int
newHandle(final int
tag, final
String owner, final
String name,
final
String desc) {
return
newHandle(
tag,
owner,
name,
desc,
tag ==
Opcodes.
H_INVOKEINTERFACE);
}
/**
* 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.
* @param itf
* true if the owner is an interface.
* @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, final boolean
itf) {
return
newHandleItem(
tag,
owner,
name,
desc,
itf).
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,
bsm.
isInterface()));
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 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,
item);
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;
// SPRING PATCH: PREFER APPLICATION CLASSLOADER
ClassLoader classLoader =
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('.', '/');
}
}
// SPRING PATCH: PREFER THREAD CONTEXT CLASSLOADER FOR APPLICATION CLASSES
protected
ClassLoader getClassLoader() {
ClassLoader classLoader = null;
try {
classLoader =
Thread.
currentThread().
getContextClassLoader();
} catch (
Throwable ex) {
// Cannot access thread context ClassLoader - falling back...
}
return (
classLoader != null ?
classLoader :
getClass().
getClassLoader());
}
/**
* 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);
}
}