jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/jvm/ClassFile.java@4868a36f6fd8 (annotated)

src/share/classes/com/sun/tools/javac/jvm/ClassFile.java@4868a36f6fd8 (annotated)

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

Tue, 28 Dec 2010 15:54:52 -0800

author: ohair
date: Tue, 28 Dec 2010 15:54:52 -0800
changeset 798: 4868a36f6fd8
parent 581: f2fdd52e4e87
child 826: 5cf6c432ef2f
permissions: -rw-r--r--

6962318: Update copyright year
Reviewed-by: xdono

 /*
  * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.tools.javac.jvm;
 import com.sun.tools.javac.code.Type;
 import com.sun.tools.javac.util.Name;
 /** A JVM class file.
  *
  *  <p>Generic Java classfiles have one additional attribute for classes,
  *  methods and fields:
  *  <pre>
  *   "Signature" (u4 attr-length, u2 signature-index)
  *  </pre>
  *
  *  <p>A signature gives the full Java type of a method or field. When
  *  used as a class attribute, it indicates type parameters, followed
  *  by supertype, followed by all interfaces.
  *  <pre>
  *     methodOrFieldSignature ::= type
  *     classSignature         ::= [ typeparams ] supertype { interfacetype }
  *  </pre>
  *  <p>The type syntax in signatures is extended as follows:
  *  <pre>
  *     type       ::= ... | classtype | methodtype | typevar
  *     classtype  ::= classsig { '.' classsig }
  *     classig    ::= 'L' name [typeargs] ';'
  *     methodtype ::= [ typeparams ] '(' { type } ')' type
  *     typevar    ::= 'T' name ';'
  *     typeargs   ::= '<' type { type } '>'
  *     typeparams ::= '<' typeparam { typeparam } '>'
  *     typeparam  ::= name ':' type
  *  </pre>
  *  <p>This class defines constants used in class files as well
  *  as routines to convert between internal ``.'' and external ``/''
  *  separators in class names.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b> */
 public class ClassFile {
     public final static int JAVA_MAGIC = 0xCAFEBABE;
     // see Target
     public final static int CONSTANT_Utf8 = 1;
     public final static int CONSTANT_Unicode = 2;
     public final static int CONSTANT_Integer = 3;
     public final static int CONSTANT_Float = 4;
     public final static int CONSTANT_Long = 5;
     public final static int CONSTANT_Double = 6;
     public final static int CONSTANT_Class = 7;
     public final static int CONSTANT_String = 8;
     public final static int CONSTANT_Fieldref = 9;
     public final static int CONSTANT_Methodref = 10;
     public final static int CONSTANT_InterfaceMethodref = 11;
     public final static int CONSTANT_NameandType = 12;
     public final static int MAX_PARAMETERS = 0xff;
     public final static int MAX_DIMENSIONS = 0xff;
     public final static int MAX_CODE = 0xffff;
     public final static int MAX_LOCALS = 0xffff;
     public final static int MAX_STACK = 0xffff;
     public enum Version {
         V45_3(45, 3), // base level for all attributes
         V49(49, 0),   // JDK 1.5: enum, generics, annotations
         V50(50, 0),   // JDK 1.6: stackmaps
         V51(51, 0);   // JDK 1.7
         Version(int major, int minor) {
             this.major = major;
             this.minor = minor;
         }
         public final int major, minor;
     }
 /************************************************************************
  * String Translation Routines
  ***********************************************************************/
     /** Return internal representation of buf[offset..offset+len-1],
      *  converting '/' to '.'.
      */
     public static byte[] internalize(byte[] buf, int offset, int len) {
         byte[] translated = new byte[len];
         for (int j = 0; j < len; j++) {
             byte b = buf[offset + j];
             if (b == '/') translated[j] = (byte) '.';
             else translated[j] = b;
         }
         return translated;
     }
     /** Return internal representation of given name,
      *  converting '/' to '.'.
      */
     public static byte[] internalize(Name name) {
         return internalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
     }
     /** Return external representation of buf[offset..offset+len-1],
      *  converting '.' to '/'.
      */
     public static byte[] externalize(byte[] buf, int offset, int len) {
         byte[] translated = new byte[len];
         for (int j = 0; j < len; j++) {
             byte b = buf[offset + j];
             if (b == '.') translated[j] = (byte) '/';
             else translated[j] = b;
         }
         return translated;
     }
     /** Return external representation of given name,
      *  converting '/' to '.'.
      */
     public static byte[] externalize(Name name) {
         return externalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
     }
 /************************************************************************
  * Name-and-type
  ***********************************************************************/
     /** A class for the name-and-type signature of a method or field.
      */
     public static class NameAndType {
         Name name;
         Type type;
         NameAndType(Name name, Type type) {
             this.name = name;
             this.type = type;
         }
         public boolean equals(Object other) {
             return
                 other instanceof NameAndType &&
                 name == ((NameAndType) other).name &&
                 type.equals(((NameAndType) other).type);
         }
         public int hashCode() {
             return name.hashCode() * type.hashCode();
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/jvm/ClassFile.java@4868a36f6fd8 (annotated)

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