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src/share/classes/com/sun/tools/classfile/ClassFile.java@2eb010b6cb22 (annotated)

src/share/classes/com/sun/tools/classfile/ClassFile.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 1863

8e3d391c88c6

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2007, 2013, 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.tools.classfile;
aoqi@0	27
aoqi@0	28	import java.io.File;
aoqi@0	29	import java.io.IOException;
aoqi@0	30	import java.io.InputStream;
aoqi@0	31	import java.nio.file.Files;
aoqi@0	32	import java.nio.file.Path;
aoqi@0	33
aoqi@0	34	import static com.sun.tools.classfile.AccessFlags.*;
aoqi@0	35
aoqi@0	36	/**
aoqi@0	37	* See JVMS, section 4.2.
aoqi@0	38	*
aoqi@0	39	* <p><b>This is NOT part of any supported API.
aoqi@0	40	* If you write code that depends on this, you do so at your own risk.
aoqi@0	41	* This code and its internal interfaces are subject to change or
aoqi@0	42	* deletion without notice.</b>
aoqi@0	43	*/
aoqi@0	44	public class ClassFile {
aoqi@0	45	public static ClassFile read(File file)
aoqi@0	46	throws IOException, ConstantPoolException {
aoqi@0	47	return read(file.toPath(), new Attribute.Factory());
aoqi@0	48	}
aoqi@0	49
aoqi@0	50	public static ClassFile read(Path input)
aoqi@0	51	throws IOException, ConstantPoolException {
aoqi@0	52	return read(input, new Attribute.Factory());
aoqi@0	53	}
aoqi@0	54
aoqi@0	55	public static ClassFile read(Path input, Attribute.Factory attributeFactory)
aoqi@0	56	throws IOException, ConstantPoolException {
aoqi@0	57	try (InputStream in = Files.newInputStream(input)) {
aoqi@0	58	return new ClassFile(in, attributeFactory);
aoqi@0	59	}
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	public static ClassFile read(File file, Attribute.Factory attributeFactory)
aoqi@0	63	throws IOException, ConstantPoolException {
aoqi@0	64	return read(file.toPath(), attributeFactory);
aoqi@0	65	}
aoqi@0	66
aoqi@0	67	public static ClassFile read(InputStream in)
aoqi@0	68	throws IOException, ConstantPoolException {
aoqi@0	69	return new ClassFile(in, new Attribute.Factory());
aoqi@0	70	}
aoqi@0	71
aoqi@0	72	public static ClassFile read(InputStream in, Attribute.Factory attributeFactory)
aoqi@0	73	throws IOException, ConstantPoolException {
aoqi@0	74	return new ClassFile(in, attributeFactory);
aoqi@0	75	}
aoqi@0	76
aoqi@0	77	ClassFile(InputStream in, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException {
aoqi@0	78	ClassReader cr = new ClassReader(this, in, attributeFactory);
aoqi@0	79	magic = cr.readInt();
aoqi@0	80	minor_version = cr.readUnsignedShort();
aoqi@0	81	major_version = cr.readUnsignedShort();
aoqi@0	82	constant_pool = new ConstantPool(cr);
aoqi@0	83	access_flags = new AccessFlags(cr);
aoqi@0	84	this_class = cr.readUnsignedShort();
aoqi@0	85	super_class = cr.readUnsignedShort();
aoqi@0	86
aoqi@0	87	int interfaces_count = cr.readUnsignedShort();
aoqi@0	88	interfaces = new int[interfaces_count];
aoqi@0	89	for (int i = 0; i < interfaces_count; i++)
aoqi@0	90	interfaces[i] = cr.readUnsignedShort();
aoqi@0	91
aoqi@0	92	int fields_count = cr.readUnsignedShort();
aoqi@0	93	fields = new Field[fields_count];
aoqi@0	94	for (int i = 0; i < fields_count; i++)
aoqi@0	95	fields[i] = new Field(cr);
aoqi@0	96
aoqi@0	97	int methods_count = cr.readUnsignedShort();
aoqi@0	98	methods = new Method[methods_count];
aoqi@0	99	for (int i = 0; i < methods_count; i++)
aoqi@0	100	methods[i] = new Method(cr);
aoqi@0	101
aoqi@0	102	attributes = new Attributes(cr);
aoqi@0	103	}
aoqi@0	104
aoqi@0	105	public ClassFile(int magic, int minor_version, int major_version,
aoqi@0	106	ConstantPool constant_pool, AccessFlags access_flags,
aoqi@0	107	int this_class, int super_class, int[] interfaces,
aoqi@0	108	Field[] fields, Method[] methods, Attributes attributes) {
aoqi@0	109	this.magic = magic;
aoqi@0	110	this.minor_version = minor_version;
aoqi@0	111	this.major_version = major_version;
aoqi@0	112	this.constant_pool = constant_pool;
aoqi@0	113	this.access_flags = access_flags;
aoqi@0	114	this.this_class = this_class;
aoqi@0	115	this.super_class = super_class;
aoqi@0	116	this.interfaces = interfaces;
aoqi@0	117	this.fields = fields;
aoqi@0	118	this.methods = methods;
aoqi@0	119	this.attributes = attributes;
aoqi@0	120	}
aoqi@0	121
aoqi@0	122	public String getName() throws ConstantPoolException {
aoqi@0	123	return constant_pool.getClassInfo(this_class).getName();
aoqi@0	124	}
aoqi@0	125
aoqi@0	126	public String getSuperclassName() throws ConstantPoolException {
aoqi@0	127	return constant_pool.getClassInfo(super_class).getName();
aoqi@0	128	}
aoqi@0	129
aoqi@0	130	public String getInterfaceName(int i) throws ConstantPoolException {
aoqi@0	131	return constant_pool.getClassInfo(interfaces[i]).getName();
aoqi@0	132	}
aoqi@0	133
aoqi@0	134	public Attribute getAttribute(String name) {
aoqi@0	135	return attributes.get(name);
aoqi@0	136	}
aoqi@0	137
aoqi@0	138	public boolean isClass() {
aoqi@0	139	return !isInterface();
aoqi@0	140	}
aoqi@0	141
aoqi@0	142	public boolean isInterface() {
aoqi@0	143	return access_flags.is(ACC_INTERFACE);
aoqi@0	144	}
aoqi@0	145
aoqi@0	146	public int byteLength() {
aoqi@0	147	return 4 + // magic
aoqi@0	148	2 + // minor
aoqi@0	149	2 + // major
aoqi@0	150	constant_pool.byteLength() +
aoqi@0	151	2 + // access flags
aoqi@0	152	2 + // this_class
aoqi@0	153	2 + // super_class
aoqi@0	154	byteLength(interfaces) +
aoqi@0	155	byteLength(fields) +
aoqi@0	156	byteLength(methods) +
aoqi@0	157	attributes.byteLength();
aoqi@0	158	}
aoqi@0	159
aoqi@0	160	private int byteLength(int[] indices) {
aoqi@0	161	return 2 + 2 * indices.length;
aoqi@0	162	}
aoqi@0	163
aoqi@0	164	private int byteLength(Field[] fields) {
aoqi@0	165	int length = 2;
aoqi@0	166	for (Field f: fields)
aoqi@0	167	length += f.byteLength();
aoqi@0	168	return length;
aoqi@0	169	}
aoqi@0	170
aoqi@0	171	private int byteLength(Method[] methods) {
aoqi@0	172	int length = 2;
aoqi@0	173	for (Method m: methods)
aoqi@0	174	length += m.byteLength();
aoqi@0	175	return length;
aoqi@0	176	}
aoqi@0	177
aoqi@0	178	public final int magic;
aoqi@0	179	public final int minor_version;
aoqi@0	180	public final int major_version;
aoqi@0	181	public final ConstantPool constant_pool;
aoqi@0	182	public final AccessFlags access_flags;
aoqi@0	183	public final int this_class;
aoqi@0	184	public final int super_class;
aoqi@0	185	public final int[] interfaces;
aoqi@0	186	public final Field[] fields;
aoqi@0	187	public final Method[] methods;
aoqi@0	188	public final Attributes attributes;
aoqi@0	189	}