1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/javac/jvm/ClassFile.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,196 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.javac.jvm;
1.30 +
1.31 +import com.sun.tools.javac.code.Type;
1.32 +import com.sun.tools.javac.code.Types;
1.33 +import com.sun.tools.javac.code.Types.UniqueType;
1.34 +import com.sun.tools.javac.util.Name;
1.35 +
1.36 +
1.37 +/** A JVM class file.
1.38 + *
1.39 + * <p>Generic Java classfiles have one additional attribute for classes,
1.40 + * methods and fields:
1.41 + * <pre>
1.42 + * "Signature" (u4 attr-length, u2 signature-index)
1.43 + * </pre>
1.44 + *
1.45 + * <p>A signature gives the full Java type of a method or field. When
1.46 + * used as a class attribute, it indicates type parameters, followed
1.47 + * by supertype, followed by all interfaces.
1.48 + * <pre>
1.49 + * methodOrFieldSignature ::= type
1.50 + * classSignature ::= [ typeparams ] supertype { interfacetype }
1.51 + * </pre>
1.52 + * <p>The type syntax in signatures is extended as follows:
1.53 + * <pre>{@literal
1.54 + * type ::= ... | classtype | methodtype | typevar
1.55 + * classtype ::= classsig { '.' classsig }
1.56 + * classig ::= 'L' name [typeargs] ';'
1.57 + * methodtype ::= [ typeparams ] '(' { type } ')' type
1.58 + * typevar ::= 'T' name ';'
1.59 + * typeargs ::= '<' type { type } '>'
1.60 + * typeparams ::= '<' typeparam { typeparam } '>'
1.61 + * typeparam ::= name ':' type
1.62 + * }</pre>
1.63 + * <p>This class defines constants used in class files as well
1.64 + * as routines to convert between internal ``.'' and external ``/''
1.65 + * separators in class names.
1.66 + *
1.67 + * <p><b>This is NOT part of any supported API.
1.68 + * If you write code that depends on this, you do so at your own risk.
1.69 + * This code and its internal interfaces are subject to change or
1.70 + * deletion without notice.</b> */
1.71 +public class ClassFile {
1.72 +
1.73 + public final static int JAVA_MAGIC = 0xCAFEBABE;
1.74 +
1.75 + // see Target
1.76 + public final static int CONSTANT_Utf8 = 1;
1.77 + public final static int CONSTANT_Unicode = 2;
1.78 + public final static int CONSTANT_Integer = 3;
1.79 + public final static int CONSTANT_Float = 4;
1.80 + public final static int CONSTANT_Long = 5;
1.81 + public final static int CONSTANT_Double = 6;
1.82 + public final static int CONSTANT_Class = 7;
1.83 + public final static int CONSTANT_String = 8;
1.84 + public final static int CONSTANT_Fieldref = 9;
1.85 + public final static int CONSTANT_Methodref = 10;
1.86 + public final static int CONSTANT_InterfaceMethodref = 11;
1.87 + public final static int CONSTANT_NameandType = 12;
1.88 + public final static int CONSTANT_MethodHandle = 15;
1.89 + public final static int CONSTANT_MethodType = 16;
1.90 + public final static int CONSTANT_InvokeDynamic = 18;
1.91 +
1.92 + public final static int REF_getField = 1;
1.93 + public final static int REF_getStatic = 2;
1.94 + public final static int REF_putField = 3;
1.95 + public final static int REF_putStatic = 4;
1.96 + public final static int REF_invokeVirtual = 5;
1.97 + public final static int REF_invokeStatic = 6;
1.98 + public final static int REF_invokeSpecial = 7;
1.99 + public final static int REF_newInvokeSpecial = 8;
1.100 + public final static int REF_invokeInterface = 9;
1.101 +
1.102 + public final static int MAX_PARAMETERS = 0xff;
1.103 + public final static int MAX_DIMENSIONS = 0xff;
1.104 + public final static int MAX_CODE = 0xffff;
1.105 + public final static int MAX_LOCALS = 0xffff;
1.106 + public final static int MAX_STACK = 0xffff;
1.107 +
1.108 + public enum Version {
1.109 + V45_3(45, 3), // base level for all attributes
1.110 + V49(49, 0), // JDK 1.5: enum, generics, annotations
1.111 + V50(50, 0), // JDK 1.6: stackmaps
1.112 + V51(51, 0), // JDK 1.7
1.113 + V52(52, 0); // JDK 1.8: lambda, type annos, param names
1.114 + Version(int major, int minor) {
1.115 + this.major = major;
1.116 + this.minor = minor;
1.117 + }
1.118 + public final int major, minor;
1.119 + }
1.120 +
1.121 +
1.122 +/************************************************************************
1.123 + * String Translation Routines
1.124 + ***********************************************************************/
1.125 +
1.126 + /** Return internal representation of buf[offset..offset+len-1],
1.127 + * converting '/' to '.'.
1.128 + */
1.129 + public static byte[] internalize(byte[] buf, int offset, int len) {
1.130 + byte[] translated = new byte[len];
1.131 + for (int j = 0; j < len; j++) {
1.132 + byte b = buf[offset + j];
1.133 + if (b == '/') translated[j] = (byte) '.';
1.134 + else translated[j] = b;
1.135 + }
1.136 + return translated;
1.137 + }
1.138 +
1.139 + /** Return internal representation of given name,
1.140 + * converting '/' to '.'.
1.141 + */
1.142 + public static byte[] internalize(Name name) {
1.143 + return internalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
1.144 + }
1.145 +
1.146 + /** Return external representation of buf[offset..offset+len-1],
1.147 + * converting '.' to '/'.
1.148 + */
1.149 + public static byte[] externalize(byte[] buf, int offset, int len) {
1.150 + byte[] translated = new byte[len];
1.151 + for (int j = 0; j < len; j++) {
1.152 + byte b = buf[offset + j];
1.153 + if (b == '.') translated[j] = (byte) '/';
1.154 + else translated[j] = b;
1.155 + }
1.156 + return translated;
1.157 + }
1.158 +
1.159 + /** Return external representation of given name,
1.160 + * converting '/' to '.'.
1.161 + */
1.162 + public static byte[] externalize(Name name) {
1.163 + return externalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
1.164 + }
1.165 +
1.166 +/************************************************************************
1.167 + * Name-and-type
1.168 + ***********************************************************************/
1.169 +
1.170 + /** A class for the name-and-type signature of a method or field.
1.171 + */
1.172 + public static class NameAndType {
1.173 + Name name;
1.174 + UniqueType uniqueType;
1.175 + Types types;
1.176 +
1.177 + NameAndType(Name name, Type type, Types types) {
1.178 + this.name = name;
1.179 + this.uniqueType = new UniqueType(type, types);
1.180 + this.types = types;
1.181 + }
1.182 +
1.183 + void setType(Type type) {
1.184 + this.uniqueType = new UniqueType(type, types);
1.185 + }
1.186 +
1.187 + @Override
1.188 + public boolean equals(Object other) {
1.189 + return (other instanceof NameAndType &&
1.190 + name == ((NameAndType) other).name &&
1.191 + uniqueType.equals(((NameAndType) other).uniqueType));
1.192 + }
1.193 +
1.194 + @Override
1.195 + public int hashCode() {
1.196 + return name.hashCode() * uniqueType.hashCode();
1.197 + }
1.198 + }
1.199 +}
