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/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000,2002,2003 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 oracle.toplink.libraries.asm;
/**
* A non standard class, field, method or code attribute.
*
* @author Eric Bruneton, Eugene Kuleshov
*/
public class Attribute {
/**
* The type of this attribute.
*/
public final String type;
/**
* The next attribute in this attribute list. May be null.
*/
public Attribute next;
/**
* Constructs a new empty attribute.
*
* @param type the type of the attribute.
*/
protected Attribute (final String type) {
this.type = type;
}
/**
* Returns true if this type of attribute is unknown.
*
* @return true if the class of this object is equal to
* {@link Attribute}.
*/
public boolean isUnknown () {
return getClass().getName().equals("oracle.toplink.libraries.asm.Attribute");
}
/**
* Returns the labels corresponding to this attribute.
*
* @return the labels corresponding to this attribute, or null if
* this attribute is not a code attribute that contains labels.
*/
protected Label[] getLabels () {
return null;
}
/**
* Reads a {@link #type type} attribute. This method must return a new
* {@link Attribute} object, of type {@link #type type}, corresponding to the
* len bytes starting at the given offset, in the given class reader.
*
* @param cr the class that contains the attribute to be read.
* @param off index of the first byte of the attribute's content in {@link
* ClassReader#b cr.b}. The 6 attribute header bytes, containing the type
* and the length of the attribute, are not taken into account here.
* @param len the length of the attribute's content.
* @param buf buffer to be used to call {@link ClassReader#readUTF8 readUTF8},
* {@link ClassReader#readClass(int,char[]) readClass} or {@link
* ClassReader#readConst readConst}.
* @param codeOff index of the first byte of code's attribute content in
* {@link ClassReader#b cr.b}, or -1 if the attribute to be read is not a
* code attribute. The 6 attribute header bytes, containing the type and
* the length of the attribute, are not taken into account here.
* @param labels the labels of the method's code, or null if the
* attribute to be read is not a code attribute.
* @return a new {@link Attribute} object corresponding to the given
* bytes.
*/
protected Attribute read (
ClassReader cr, int off, int len, char[] buf, int codeOff, Label[] labels)
{
return new Attribute(type);
}
/**
* Returns the byte array form of this attribute.
*
* @param cw the class to which this attribute must be added. This parameter
* can be used to add to the constant pool of this class the items that
* corresponds to this attribute.
* @param code the bytecode of the method corresponding to this code
* attribute, or null if this attribute is not a code
* attributes.
* @param len the length of the bytecode of the method corresponding to this
* code attribute, or null if this attribute is not a code
* attribute.
* @param maxStack the maximum stack size of the method corresponding to this
* code attribute, or -1 if this attribute is not a code attribute.
* @param maxLocals the maximum number of local variables of the method
* corresponding to this code attribute, or -1 if this attribute is not
* a code attribute.
* @return the byte array form of this attribute.
*/
protected ByteVector write (
ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
{
return new ByteVector();
}
/**
* Returns the length of the attribute list that begins with this attribute.
*
* @return the length of the attribute list that begins with this attribute.
*/
final int getCount () {
int count = 0;
Attribute attr = this;
while (attr != null) {
if (!attr.isUnknown()) {
count += 1;
}
attr = attr.next;
}
return count;
}
/**
* Returns the size of all the attributes in this attribute list.
*
* @param cw the class writer to be used to convert the attributes into byte
* arrays, with the {@link #write write} method.
* @param code the bytecode of the method corresponding to these code
* attributes, or null if these attributes are not code
* attributes.
* @param len the length of the bytecode of the method corresponding to these
* code attributes, or null if these attributes are not code
* attributes.
* @param maxStack the maximum stack size of the method corresponding to these
* code attributes, or -1 if these attributes are not code attributes.
* @param maxLocals the maximum number of local variables of the method
* corresponding to these code attributes, or -1 if these attributes are
* not code attributes.
* @return the size of all the attributes in this attribute list. This size
* includes the size of the attribute headers.
*/
final int getSize (
final ClassWriter cw,
final byte[] code,
final int len,
final int maxStack,
final int maxLocals)
{
Attribute attr = this;
int size = 0;
while (attr != null) {
if (!attr.isUnknown()) {
cw.newUTF8(attr.type);
size += attr.write(cw, code, len, maxStack, maxLocals).length + 6;
}
attr = attr.next;
}
return size;
}
/**
* Writes all the attributes of this attribute list in the given byte vector.
*
* @param cw the class writer to be used to convert the attributes into byte
* arrays, with the {@link #write write} method.
* @param code the bytecode of the method corresponding to these code
* attributes, or null if these attributes are not code
* attributes.
* @param len the length of the bytecode of the method corresponding to these
* code attributes, or null if these attributes are not code
* attributes.
* @param maxStack the maximum stack size of the method corresponding to these
* code attributes, or -1 if these attributes are not code attributes.
* @param maxLocals the maximum number of local variables of the method
* corresponding to these code attributes, or -1 if these attributes are
* not code attributes.
* @param out where the attributes must be written.
*/
final void put (
final ClassWriter cw,
final byte[] code,
final int len,
final int maxStack,
final int maxLocals,
final ByteVector out)
{
if (next != null) {
next.put(cw, code, len, maxStack, maxLocals, out);
}
if (isUnknown()) {
if (cw.checkAttributes) {
throw new IllegalArgumentException("Unknown attribute type " + type);
}
} else {
ByteVector b = write(cw, code, len, maxStack, maxLocals);
out.putShort(cw.newUTF8(type)).putInt(b.length);
out.putByteArray(b.data, 0, b.length);
}
}
}
