| /* |
| * Copyright (c) 1999, 2012, 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.code.Types; |
| import com.sun.tools.javac.code.Types.UniqueType; |
| 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>{@literal |
| * 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 CONSTANT_MethodHandle = 15; |
| public final static int CONSTANT_MethodType = 16; |
| public final static int CONSTANT_InvokeDynamic = 18; |
| |
| public final static int REF_getField = 1; |
| public final static int REF_getStatic = 2; |
| public final static int REF_putField = 3; |
| public final static int REF_putStatic = 4; |
| public final static int REF_invokeVirtual = 5; |
| public final static int REF_invokeStatic = 6; |
| public final static int REF_invokeSpecial = 7; |
| public final static int REF_newInvokeSpecial = 8; |
| public final static int REF_invokeInterface = 9; |
| |
| 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 |
| V52(52, 0); // JDK 1.8: lambda, type annos, param names |
| 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; |
| UniqueType uniqueType; |
| Types types; |
| |
| NameAndType(Name name, Type type, Types types) { |
| this.name = name; |
| this.uniqueType = new UniqueType(type, types); |
| this.types = types; |
| } |
| |
| void setType(Type type) { |
| this.uniqueType = new UniqueType(type, types); |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| return (other instanceof NameAndType && |
| name == ((NameAndType) other).name && |
| uniqueType.equals(((NameAndType) other).uniqueType)); |
| } |
| |
| @Override |
| public int hashCode() { |
| return name.hashCode() * uniqueType.hashCode(); |
| } |
| } |
| } |
