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 Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,160 @@
1.4 +/*
1.5 + * Copyright 1999-2005 Sun Microsystems, Inc. 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. Sun designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.25 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.26 + * have any questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.javac.jvm;
1.30 +
1.31 +import com.sun.tools.javac.code.*;
1.32 +import com.sun.tools.javac.util.*;
1.33 +
1.34 +/** A JVM class file.
1.35 + *
1.36 + * <p>Generic Java classfiles have one additional attribute for classes,
1.37 + * methods and fields:
1.38 + * <pre>
1.39 + * "Signature" (u4 attr-length, u2 signature-index)
1.40 + * </pre>
1.41 + *
1.42 + * <p>A signature gives the full Java type of a method or field. When
1.43 + * used as a class attribute, it indicates type parameters, followed
1.44 + * by supertype, followed by all interfaces.
1.45 + * <pre>
1.46 + * methodOrFieldSignature ::= type
1.47 + * classSignature ::= [ typeparams ] supertype { interfacetype }
1.48 + * </pre>
1.49 + * <p>The type syntax in signatures is extended as follows:
1.50 + * <pre>
1.51 + * type ::= ... | classtype | methodtype | typevar
1.52 + * classtype ::= classsig { '.' classsig }
1.53 + * classig ::= 'L' name [typeargs] ';'
1.54 + * methodtype ::= [ typeparams ] '(' { type } ')' type
1.55 + * typevar ::= 'T' name ';'
1.56 + * typeargs ::= '<' type { type } '>'
1.57 + * typeparams ::= '<' typeparam { typeparam } '>'
1.58 + * typeparam ::= name ':' type
1.59 + * </pre>
1.60 + * <p>This class defines constants used in class files as well
1.61 + * as routines to convert between internal ``.'' and external ``/''
1.62 + * separators in class names.
1.63 + *
1.64 + * <p><b>This is NOT part of any API supported by Sun Microsystems. If
1.65 + * you write code that depends on this, you do so at your own risk.
1.66 + * This code and its internal interfaces are subject to change or
1.67 + * deletion without notice.</b> */
1.68 +public class ClassFile {
1.69 +
1.70 + public final static int JAVA_MAGIC = 0xCAFEBABE;
1.71 +
1.72 + // see Target
1.73 + public final static int CONSTANT_Utf8 = 1;
1.74 + public final static int CONSTANT_Unicode = 2;
1.75 + public final static int CONSTANT_Integer = 3;
1.76 + public final static int CONSTANT_Float = 4;
1.77 + public final static int CONSTANT_Long = 5;
1.78 + public final static int CONSTANT_Double = 6;
1.79 + public final static int CONSTANT_Class = 7;
1.80 + public final static int CONSTANT_String = 8;
1.81 + public final static int CONSTANT_Fieldref = 9;
1.82 + public final static int CONSTANT_Methodref = 10;
1.83 + public final static int CONSTANT_InterfaceMethodref = 11;
1.84 + public final static int CONSTANT_NameandType = 12;
1.85 +
1.86 + public final static int MAX_PARAMETERS = 0xff;
1.87 + public final static int MAX_DIMENSIONS = 0xff;
1.88 + public final static int MAX_CODE = 0xffff;
1.89 + public final static int MAX_LOCALS = 0xffff;
1.90 + public final static int MAX_STACK = 0xffff;
1.91 +
1.92 +
1.93 +/************************************************************************
1.94 + * String Translation Routines
1.95 + ***********************************************************************/
1.96 +
1.97 + /** Return internal representation of buf[offset..offset+len-1],
1.98 + * converting '/' to '.'.
1.99 + */
1.100 + public static byte[] internalize(byte[] buf, int offset, int len) {
1.101 + byte[] translated = new byte[len];
1.102 + for (int j = 0; j < len; j++) {
1.103 + byte b = buf[offset + j];
1.104 + if (b == '/') translated[j] = (byte) '.';
1.105 + else translated[j] = b;
1.106 + }
1.107 + return translated;
1.108 + }
1.109 +
1.110 + /** Return internal representation of given name,
1.111 + * converting '/' to '.'.
1.112 + */
1.113 + public static byte[] internalize(Name name) {
1.114 + return internalize(name.table.names, name.index, name.len);
1.115 + }
1.116 +
1.117 + /** Return external representation of buf[offset..offset+len-1],
1.118 + * converting '.' to '/'.
1.119 + */
1.120 + public static byte[] externalize(byte[] buf, int offset, int len) {
1.121 + byte[] translated = new byte[len];
1.122 + for (int j = 0; j < len; j++) {
1.123 + byte b = buf[offset + j];
1.124 + if (b == '.') translated[j] = (byte) '/';
1.125 + else translated[j] = b;
1.126 + }
1.127 + return translated;
1.128 + }
1.129 +
1.130 + /** Return external representation of given name,
1.131 + * converting '/' to '.'.
1.132 + */
1.133 + public static byte[] externalize(Name name) {
1.134 + return externalize(name.table.names, name.index, name.len);
1.135 + }
1.136 +
1.137 +/************************************************************************
1.138 + * Name-and-type
1.139 + ***********************************************************************/
1.140 +
1.141 + /** A class for the name-and-type signature of a method or field.
1.142 + */
1.143 + public static class NameAndType {
1.144 + Name name;
1.145 + Type type;
1.146 +
1.147 + NameAndType(Name name, Type type) {
1.148 + this.name = name;
1.149 + this.type = type;
1.150 + }
1.151 +
1.152 + public boolean equals(Object other) {
1.153 + return
1.154 + other instanceof NameAndType &&
1.155 + name == ((NameAndType) other).name &&
1.156 + type.equals(((NameAndType) other).type);
1.157 + }
1.158 +
1.159 + public int hashCode() {
1.160 + return name.hashCode() * type.hashCode();
1.161 + }
1.162 + }
1.163 +}
