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src/share/jaxws_classes/com/sun/xml/internal/bind/v2/bytecode/ClassTailor.java@e530533619ec (annotated)

src/share/jaxws_classes/com/sun/xml/internal/bind/v2/bytecode/ClassTailor.java

Thu, 12 Oct 2017 19:44:07 +0800

author

aoqi

date

Thu, 12 Oct 2017 19:44:07 +0800

changeset 760

e530533619ec

parent 0

373ffda63c9a

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.xml.internal.bind.v2.bytecode;
aoqi@0	27
aoqi@0	28	import java.io.ByteArrayOutputStream;
aoqi@0	29	import java.io.DataInputStream;
aoqi@0	30	import java.io.DataOutputStream;
aoqi@0	31	import java.io.IOException;
aoqi@0	32	import java.io.InputStream;
aoqi@0	33	import java.util.logging.Level;
aoqi@0	34	import java.util.logging.Logger;
aoqi@0	35
aoqi@0	36	import com.sun.xml.internal.bind.Util;
aoqi@0	37
aoqi@0	38	/**
aoqi@0	39	* Replaces a few constant pool tokens from a class "template" and then loads it into the VM.
aoqi@0	40	*
aoqi@0	41	* @author Kohsuke Kawaguchi
aoqi@0	42	*/
aoqi@0	43	public final class ClassTailor {
aoqi@0	44
aoqi@0	45	private ClassTailor() {} // no instanciation please
aoqi@0	46
aoqi@0	47	private static final Logger logger = Util.getClassLogger();
aoqi@0	48
aoqi@0	49	/**
aoqi@0	50	* Returns the class name in the JVM format (such as "java/lang/String")
aoqi@0	51	*/
aoqi@0	52	public static String toVMClassName( Class c ) {
aoqi@0	53	assert !c.isPrimitive();
aoqi@0	54	if(c.isArray())
aoqi@0	55	// I have no idea why it is designed like this, but javap says so.
aoqi@0	56	return toVMTypeName(c);
aoqi@0	57	return c.getName().replace('.','/');
aoqi@0	58	}
aoqi@0	59
aoqi@0	60	public static String toVMTypeName( Class c ) {
aoqi@0	61	if(c.isArray()) {
aoqi@0	62	// TODO: study how an array type is encoded.
aoqi@0	63	return '['+toVMTypeName(c.getComponentType());
aoqi@0	64	}
aoqi@0	65	if(c.isPrimitive()) {
aoqi@0	66	if(c==Boolean.TYPE) return "Z";
aoqi@0	67	if(c==Character.TYPE) return "C";
aoqi@0	68	if(c==Byte.TYPE) return "B";
aoqi@0	69	if(c==Double.TYPE) return "D";
aoqi@0	70	if(c==Float.TYPE) return "F";
aoqi@0	71	if(c==Integer.TYPE) return "I";
aoqi@0	72	if(c==Long.TYPE) return "J";
aoqi@0	73	if(c==Short.TYPE) return "S";
aoqi@0	74
aoqi@0	75	throw new IllegalArgumentException(c.getName());
aoqi@0	76	}
aoqi@0	77	return 'L'+c.getName().replace('.','/')+';';
aoqi@0	78	}
aoqi@0	79
aoqi@0	80
aoqi@0	81
aoqi@0	82	public static byte[] tailor( Class templateClass, String newClassName, String... replacements ) {
aoqi@0	83	String vmname = toVMClassName(templateClass);
aoqi@0	84	return tailor(
aoqi@0	85	SecureLoader.getClassClassLoader(templateClass).getResourceAsStream(vmname+".class"),
aoqi@0	86	vmname, newClassName, replacements );
aoqi@0	87	}
aoqi@0	88
aoqi@0	89
aoqi@0	90	/**
aoqi@0	91	* Customizes a class file by replacing constant pools.
aoqi@0	92	*
aoqi@0	93	* @param image
aoqi@0	94	* The image of the template class.
aoqi@0	95	* @param replacements
aoqi@0	96	* A list of pair of strings that specify the substitution
aoqi@0	97	* {@code String[]{search_0, replace_0, search_1, replace_1, ..., search_n, replace_n }}
aoqi@0	98	*
aoqi@0	99	* The search strings found in the constant pool will be replaced by the corresponding
aoqi@0	100	* replacement string.
aoqi@0	101	*/
aoqi@0	102	public static byte[] tailor( InputStream image, String templateClassName, String newClassName, String... replacements ) {
aoqi@0	103	DataInputStream in = new DataInputStream(image);
aoqi@0	104
aoqi@0	105	try {
aoqi@0	106	ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
aoqi@0	107	DataOutputStream out = new DataOutputStream(baos);
aoqi@0	108
aoqi@0	109	// skip until the constant pool count
aoqi@0	110	long l = in.readLong();
aoqi@0	111	out.writeLong(l);
aoqi@0	112
aoqi@0	113	// read the constant pool size
aoqi@0	114	short count = in.readShort();
aoqi@0	115	out.writeShort(count);
aoqi@0	116
aoqi@0	117	// replace constant pools
aoqi@0	118	for( int i=0; i<count; i++ ) {
aoqi@0	119	byte tag = in.readByte();
aoqi@0	120	out.writeByte(tag);
aoqi@0	121	switch(tag) {
aoqi@0	122	case 0:
aoqi@0	123	// this isn't described in the spec,
aoqi@0	124	// but class files often seem to have this '0' tag.
aoqi@0	125	// we can apparently just ignore it, but not sure
aoqi@0	126	// what this really means.
aoqi@0	127	break;
aoqi@0	128
aoqi@0	129	case 1: // CONSTANT_UTF8
aoqi@0	130	{
aoqi@0	131	String value = in.readUTF();
aoqi@0	132	if(value.equals(templateClassName))
aoqi@0	133	value = newClassName;
aoqi@0	134	else {
aoqi@0	135	for( int j=0; j<replacements.length; j+=2 )
aoqi@0	136	if(value.equals(replacements[j])) {
aoqi@0	137	value = replacements[j+1];
aoqi@0	138	break;
aoqi@0	139	}
aoqi@0	140	}
aoqi@0	141	out.writeUTF(value);
aoqi@0	142	}
aoqi@0	143	break;
aoqi@0	144
aoqi@0	145	case 3: // CONSTANT_Integer
aoqi@0	146	case 4: // CONSTANT_Float
aoqi@0	147	out.writeInt(in.readInt());
aoqi@0	148	break;
aoqi@0	149
aoqi@0	150	case 5: // CONSTANT_Long
aoqi@0	151	case 6: // CONSTANT_Double
aoqi@0	152	i++; // doubles and longs take two entries
aoqi@0	153	out.writeLong(in.readLong());
aoqi@0	154	break;
aoqi@0	155
aoqi@0	156	case 7: // CONSTANT_Class
aoqi@0	157	case 8: // CONSTANT_String
aoqi@0	158	out.writeShort(in.readShort());
aoqi@0	159	break;
aoqi@0	160
aoqi@0	161	case 9: // CONSTANT_Fieldref
aoqi@0	162	case 10: // CONSTANT_Methodref
aoqi@0	163	case 11: // CONSTANT_InterfaceMethodref
aoqi@0	164	case 12: // CONSTANT_NameAndType
aoqi@0	165	out.writeInt(in.readInt());
aoqi@0	166	break;
aoqi@0	167
aoqi@0	168	default:
aoqi@0	169	throw new IllegalArgumentException("Unknown constant type "+tag);
aoqi@0	170	}
aoqi@0	171	}
aoqi@0	172
aoqi@0	173	// then copy the rest
aoqi@0	174	byte[] buf = new byte[512];
aoqi@0	175	int len;
aoqi@0	176	while((len=in.read(buf))>0)
aoqi@0	177	out.write(buf,0,len);
aoqi@0	178
aoqi@0	179	in.close();
aoqi@0	180	out.close();
aoqi@0	181
aoqi@0	182	// by now we got the properly tailored class file image
aoqi@0	183	return baos.toByteArray();
aoqi@0	184
aoqi@0	185	} catch( IOException e ) {
aoqi@0	186	// never happen
aoqi@0	187	logger.log(Level.WARNING,"failed to tailor",e);
aoqi@0	188	return null;
aoqi@0	189	}
aoqi@0	190	}
aoqi@0	191	}