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src/share/classes/com/sun/tools/javac/jvm/ClassFile.java@9ca8d8713094 (annotated)

src/share/classes/com/sun/tools/javac/jvm/ClassFile.java

Thu, 12 Oct 2017 19:50:01 +0800

author

aoqi

date

Thu, 12 Oct 2017 19:50:01 +0800

changeset 2702

9ca8d8713094

parent 2525

2eb010b6cb22

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1999, 2012, 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.javac.jvm;
aoqi@0	27
aoqi@0	28	import com.sun.tools.javac.code.Type;
aoqi@0	29	import com.sun.tools.javac.code.Types;
aoqi@0	30	import com.sun.tools.javac.code.Types.UniqueType;
aoqi@0	31	import com.sun.tools.javac.util.Name;
aoqi@0	32
aoqi@0	33
aoqi@0	34	/** A JVM class file.
aoqi@0	35	*
aoqi@0	36	* <p>Generic Java classfiles have one additional attribute for classes,
aoqi@0	37	* methods and fields:
aoqi@0	38	* <pre>
aoqi@0	39	* "Signature" (u4 attr-length, u2 signature-index)
aoqi@0	40	* </pre>
aoqi@0	41	*
aoqi@0	42	* <p>A signature gives the full Java type of a method or field. When
aoqi@0	43	* used as a class attribute, it indicates type parameters, followed
aoqi@0	44	* by supertype, followed by all interfaces.
aoqi@0	45	* <pre>
aoqi@0	46	* methodOrFieldSignature ::= type
aoqi@0	47	* classSignature ::= [ typeparams ] supertype { interfacetype }
aoqi@0	48	* </pre>
aoqi@0	49	* <p>The type syntax in signatures is extended as follows:
aoqi@0	50	* <pre>{@literal
aoqi@0	51	* type ::= ... | classtype | methodtype | typevar
aoqi@0	52	* classtype ::= classsig { '.' classsig }
aoqi@0	53	* classig ::= 'L' name [typeargs] ';'
aoqi@0	54	* methodtype ::= [ typeparams ] '(' { type } ')' type
aoqi@0	55	* typevar ::= 'T' name ';'
aoqi@0	56	* typeargs ::= '<' type { type } '>'
aoqi@0	57	* typeparams ::= '<' typeparam { typeparam } '>'
aoqi@0	58	* typeparam ::= name ':' type
aoqi@0	59	* }</pre>
aoqi@0	60	* <p>This class defines constants used in class files as well
aoqi@0	61	* as routines to convert between internal ``.'' and external ``/''
aoqi@0	62	* separators in class names.
aoqi@0	63	*
aoqi@0	64	* <p><b>This is NOT part of any supported API.
aoqi@0	65	* If you write code that depends on this, you do so at your own risk.
aoqi@0	66	* This code and its internal interfaces are subject to change or
aoqi@0	67	* deletion without notice.</b> */
aoqi@0	68	public class ClassFile {
aoqi@0	69
aoqi@0	70	public final static int JAVA_MAGIC = 0xCAFEBABE;
aoqi@0	71
aoqi@0	72	// see Target
aoqi@0	73	public final static int CONSTANT_Utf8 = 1;
aoqi@0	74	public final static int CONSTANT_Unicode = 2;
aoqi@0	75	public final static int CONSTANT_Integer = 3;
aoqi@0	76	public final static int CONSTANT_Float = 4;
aoqi@0	77	public final static int CONSTANT_Long = 5;
aoqi@0	78	public final static int CONSTANT_Double = 6;
aoqi@0	79	public final static int CONSTANT_Class = 7;
aoqi@0	80	public final static int CONSTANT_String = 8;
aoqi@0	81	public final static int CONSTANT_Fieldref = 9;
aoqi@0	82	public final static int CONSTANT_Methodref = 10;
aoqi@0	83	public final static int CONSTANT_InterfaceMethodref = 11;
aoqi@0	84	public final static int CONSTANT_NameandType = 12;
aoqi@0	85	public final static int CONSTANT_MethodHandle = 15;
aoqi@0	86	public final static int CONSTANT_MethodType = 16;
aoqi@0	87	public final static int CONSTANT_InvokeDynamic = 18;
aoqi@0	88
aoqi@0	89	public final static int REF_getField = 1;
aoqi@0	90	public final static int REF_getStatic = 2;
aoqi@0	91	public final static int REF_putField = 3;
aoqi@0	92	public final static int REF_putStatic = 4;
aoqi@0	93	public final static int REF_invokeVirtual = 5;
aoqi@0	94	public final static int REF_invokeStatic = 6;
aoqi@0	95	public final static int REF_invokeSpecial = 7;
aoqi@0	96	public final static int REF_newInvokeSpecial = 8;
aoqi@0	97	public final static int REF_invokeInterface = 9;
aoqi@0	98
aoqi@0	99	public final static int MAX_PARAMETERS = 0xff;
aoqi@0	100	public final static int MAX_DIMENSIONS = 0xff;
aoqi@0	101	public final static int MAX_CODE = 0xffff;
aoqi@0	102	public final static int MAX_LOCALS = 0xffff;
aoqi@0	103	public final static int MAX_STACK = 0xffff;
aoqi@0	104
aoqi@0	105	public enum Version {
aoqi@0	106	V45_3(45, 3), // base level for all attributes
aoqi@0	107	V49(49, 0), // JDK 1.5: enum, generics, annotations
aoqi@0	108	V50(50, 0), // JDK 1.6: stackmaps
aoqi@0	109	V51(51, 0), // JDK 1.7
aoqi@0	110	V52(52, 0); // JDK 1.8: lambda, type annos, param names
aoqi@0	111	Version(int major, int minor) {
aoqi@0	112	this.major = major;
aoqi@0	113	this.minor = minor;
aoqi@0	114	}
aoqi@0	115	public final int major, minor;
aoqi@0	116	}
aoqi@0	117
aoqi@0	118
aoqi@0	119	/************************************************************************
aoqi@0	120	* String Translation Routines
aoqi@0	121	***********************************************************************/
aoqi@0	122
aoqi@0	123	/** Return internal representation of buf[offset..offset+len-1],
aoqi@0	124	* converting '/' to '.'.
aoqi@0	125	*/
aoqi@0	126	public static byte[] internalize(byte[] buf, int offset, int len) {
aoqi@0	127	byte[] translated = new byte[len];
aoqi@0	128	for (int j = 0; j < len; j++) {
aoqi@0	129	byte b = buf[offset + j];
aoqi@0	130	if (b == '/') translated[j] = (byte) '.';
aoqi@0	131	else translated[j] = b;
aoqi@0	132	}
aoqi@0	133	return translated;
aoqi@0	134	}
aoqi@0	135
aoqi@0	136	/** Return internal representation of given name,
aoqi@0	137	* converting '/' to '.'.
aoqi@0	138	*/
aoqi@0	139	public static byte[] internalize(Name name) {
aoqi@0	140	return internalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
aoqi@0	141	}
aoqi@0	142
aoqi@0	143	/** Return external representation of buf[offset..offset+len-1],
aoqi@0	144	* converting '.' to '/'.
aoqi@0	145	*/
aoqi@0	146	public static byte[] externalize(byte[] buf, int offset, int len) {
aoqi@0	147	byte[] translated = new byte[len];
aoqi@0	148	for (int j = 0; j < len; j++) {
aoqi@0	149	byte b = buf[offset + j];
aoqi@0	150	if (b == '.') translated[j] = (byte) '/';
aoqi@0	151	else translated[j] = b;
aoqi@0	152	}
aoqi@0	153	return translated;
aoqi@0	154	}
aoqi@0	155
aoqi@0	156	/** Return external representation of given name,
aoqi@0	157	* converting '/' to '.'.
aoqi@0	158	*/
aoqi@0	159	public static byte[] externalize(Name name) {
aoqi@0	160	return externalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
aoqi@0	161	}
aoqi@0	162
aoqi@0	163	/************************************************************************
aoqi@0	164	* Name-and-type
aoqi@0	165	***********************************************************************/
aoqi@0	166
aoqi@0	167	/** A class for the name-and-type signature of a method or field.
aoqi@0	168	*/
aoqi@0	169	public static class NameAndType {
aoqi@0	170	Name name;
aoqi@0	171	UniqueType uniqueType;
aoqi@0	172	Types types;
aoqi@0	173
aoqi@0	174	NameAndType(Name name, Type type, Types types) {
aoqi@0	175	this.name = name;
aoqi@0	176	this.uniqueType = new UniqueType(type, types);
aoqi@0	177	this.types = types;
aoqi@0	178	}
aoqi@0	179
aoqi@0	180	void setType(Type type) {
aoqi@0	181	this.uniqueType = new UniqueType(type, types);
aoqi@0	182	}
aoqi@0	183
aoqi@0	184	@Override
aoqi@0	185	public boolean equals(Object other) {
aoqi@0	186	return (other instanceof NameAndType &&
aoqi@0	187	name == ((NameAndType) other).name &&
aoqi@0	188	uniqueType.equals(((NameAndType) other).uniqueType));
aoqi@0	189	}
aoqi@0	190
aoqi@0	191	@Override
aoqi@0	192	public int hashCode() {
aoqi@0	193	return name.hashCode() * uniqueType.hashCode();
aoqi@0	194	}
aoqi@0	195	}
aoqi@0	196	}