Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/jvm/ClassFile.java@9a66ca7c79fa
src/share/classes/com/sun/tools/javac/jvm/ClassFile.java
Sat, 01 Dec 2007 00:00:00 +0000
- author
- duke
- date
- Sat, 01 Dec 2007 00:00:00 +0000
- changeset 1
- 9a66ca7c79fa
- child 113
- eff38cc97183
- permissions
- -rw-r--r--
Initial load
1 /*
2 * Copyright 1999-2005 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javac.jvm;
28 import com.sun.tools.javac.code.*;
29 import com.sun.tools.javac.util.*;
31 /** A JVM class file.
32 *
33 * <p>Generic Java classfiles have one additional attribute for classes,
34 * methods and fields:
35 * <pre>
36 * "Signature" (u4 attr-length, u2 signature-index)
37 * </pre>
38 *
39 * <p>A signature gives the full Java type of a method or field. When
40 * used as a class attribute, it indicates type parameters, followed
41 * by supertype, followed by all interfaces.
42 * <pre>
43 * methodOrFieldSignature ::= type
44 * classSignature ::= [ typeparams ] supertype { interfacetype }
45 * </pre>
46 * <p>The type syntax in signatures is extended as follows:
47 * <pre>
48 * type ::= ... | classtype | methodtype | typevar
49 * classtype ::= classsig { '.' classsig }
50 * classig ::= 'L' name [typeargs] ';'
51 * methodtype ::= [ typeparams ] '(' { type } ')' type
52 * typevar ::= 'T' name ';'
53 * typeargs ::= '<' type { type } '>'
54 * typeparams ::= '<' typeparam { typeparam } '>'
55 * typeparam ::= name ':' type
56 * </pre>
57 * <p>This class defines constants used in class files as well
58 * as routines to convert between internal ``.'' and external ``/''
59 * separators in class names.
60 *
61 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
62 * you write code that depends on this, you do so at your own risk.
63 * This code and its internal interfaces are subject to change or
64 * deletion without notice.</b> */
65 public class ClassFile {
67 public final static int JAVA_MAGIC = 0xCAFEBABE;
69 // see Target
70 public final static int CONSTANT_Utf8 = 1;
71 public final static int CONSTANT_Unicode = 2;
72 public final static int CONSTANT_Integer = 3;
73 public final static int CONSTANT_Float = 4;
74 public final static int CONSTANT_Long = 5;
75 public final static int CONSTANT_Double = 6;
76 public final static int CONSTANT_Class = 7;
77 public final static int CONSTANT_String = 8;
78 public final static int CONSTANT_Fieldref = 9;
79 public final static int CONSTANT_Methodref = 10;
80 public final static int CONSTANT_InterfaceMethodref = 11;
81 public final static int CONSTANT_NameandType = 12;
83 public final static int MAX_PARAMETERS = 0xff;
84 public final static int MAX_DIMENSIONS = 0xff;
85 public final static int MAX_CODE = 0xffff;
86 public final static int MAX_LOCALS = 0xffff;
87 public final static int MAX_STACK = 0xffff;
90 /************************************************************************
91 * String Translation Routines
92 ***********************************************************************/
94 /** Return internal representation of buf[offset..offset+len-1],
95 * converting '/' to '.'.
96 */
97 public static byte[] internalize(byte[] buf, int offset, int len) {
98 byte[] translated = new byte[len];
99 for (int j = 0; j < len; j++) {
100 byte b = buf[offset + j];
101 if (b == '/') translated[j] = (byte) '.';
102 else translated[j] = b;
103 }
104 return translated;
105 }
107 /** Return internal representation of given name,
108 * converting '/' to '.'.
109 */
110 public static byte[] internalize(Name name) {
111 return internalize(name.table.names, name.index, name.len);
112 }
114 /** Return external representation of buf[offset..offset+len-1],
115 * converting '.' to '/'.
116 */
117 public static byte[] externalize(byte[] buf, int offset, int len) {
118 byte[] translated = new byte[len];
119 for (int j = 0; j < len; j++) {
120 byte b = buf[offset + j];
121 if (b == '.') translated[j] = (byte) '/';
122 else translated[j] = b;
123 }
124 return translated;
125 }
127 /** Return external representation of given name,
128 * converting '/' to '.'.
129 */
130 public static byte[] externalize(Name name) {
131 return externalize(name.table.names, name.index, name.len);
132 }
134 /************************************************************************
135 * Name-and-type
136 ***********************************************************************/
138 /** A class for the name-and-type signature of a method or field.
139 */
140 public static class NameAndType {
141 Name name;
142 Type type;
144 NameAndType(Name name, Type type) {
145 this.name = name;
146 this.type = type;
147 }
149 public boolean equals(Object other) {
150 return
151 other instanceof NameAndType &&
152 name == ((NameAndType) other).name &&
153 type.equals(((NameAndType) other).type);
154 }
156 public int hashCode() {
157 return name.hashCode() * type.hashCode();
158 }
159 }
160 }
