197 lines
7.2 KiB
Java
197 lines
7.2 KiB
Java
/*
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* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.javac.jvm;
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import com.sun.tools.javac.code.Type;
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import com.sun.tools.javac.code.Types;
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import com.sun.tools.javac.code.Types.UniqueType;
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import com.sun.tools.javac.util.Name;
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/** A JVM class file.
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*
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* <p>Generic Java classfiles have one additional attribute for classes,
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* methods and fields:
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* <pre>
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* "Signature" (u4 attr-length, u2 signature-index)
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* </pre>
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*
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* <p>A signature gives the full Java type of a method or field. When
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* used as a class attribute, it indicates type parameters, followed
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* by supertype, followed by all interfaces.
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* <pre>
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* methodOrFieldSignature ::= type
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* classSignature ::= [ typeparams ] supertype { interfacetype }
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* </pre>
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* <p>The type syntax in signatures is extended as follows:
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* <pre>{@literal
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* type ::= ... | classtype | methodtype | typevar
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* classtype ::= classsig { '.' classsig }
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* classig ::= 'L' name [typeargs] ';'
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* methodtype ::= [ typeparams ] '(' { type } ')' type
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* typevar ::= 'T' name ';'
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* typeargs ::= '<' type { type } '>'
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* typeparams ::= '<' typeparam { typeparam } '>'
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* typeparam ::= name ':' type
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* }</pre>
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* <p>This class defines constants used in class files as well
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* as routines to convert between internal ``.'' and external ``/''
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* separators in class names.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b> */
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public class ClassFile {
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public final static int JAVA_MAGIC = 0xCAFEBABE;
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// see Target
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public final static int CONSTANT_Utf8 = 1;
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public final static int CONSTANT_Unicode = 2;
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public final static int CONSTANT_Integer = 3;
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public final static int CONSTANT_Float = 4;
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public final static int CONSTANT_Long = 5;
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public final static int CONSTANT_Double = 6;
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public final static int CONSTANT_Class = 7;
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public final static int CONSTANT_String = 8;
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public final static int CONSTANT_Fieldref = 9;
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public final static int CONSTANT_Methodref = 10;
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public final static int CONSTANT_InterfaceMethodref = 11;
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public final static int CONSTANT_NameandType = 12;
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public final static int CONSTANT_MethodHandle = 15;
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public final static int CONSTANT_MethodType = 16;
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public final static int CONSTANT_InvokeDynamic = 18;
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public final static int REF_getField = 1;
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public final static int REF_getStatic = 2;
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public final static int REF_putField = 3;
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public final static int REF_putStatic = 4;
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public final static int REF_invokeVirtual = 5;
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public final static int REF_invokeStatic = 6;
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public final static int REF_invokeSpecial = 7;
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public final static int REF_newInvokeSpecial = 8;
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public final static int REF_invokeInterface = 9;
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public final static int MAX_PARAMETERS = 0xff;
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public final static int MAX_DIMENSIONS = 0xff;
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public final static int MAX_CODE = 0xffff;
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public final static int MAX_LOCALS = 0xffff;
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public final static int MAX_STACK = 0xffff;
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public enum Version {
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V45_3(45, 3), // base level for all attributes
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V49(49, 0), // JDK 1.5: enum, generics, annotations
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V50(50, 0), // JDK 1.6: stackmaps
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V51(51, 0), // JDK 1.7
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V52(52, 0); // JDK 1.8: lambda, type annos, param names
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Version(int major, int minor) {
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this.major = major;
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this.minor = minor;
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}
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public final int major, minor;
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}
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/************************************************************************
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* String Translation Routines
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***********************************************************************/
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/** Return internal representation of buf[offset..offset+len-1],
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* converting '/' to '.'.
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*/
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public static byte[] internalize(byte[] buf, int offset, int len) {
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byte[] translated = new byte[len];
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for (int j = 0; j < len; j++) {
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byte b = buf[offset + j];
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if (b == '/') translated[j] = (byte) '.';
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else translated[j] = b;
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}
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return translated;
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}
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/** Return internal representation of given name,
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* converting '/' to '.'.
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*/
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public static byte[] internalize(Name name) {
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return internalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
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}
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/** Return external representation of buf[offset..offset+len-1],
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* converting '.' to '/'.
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*/
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public static byte[] externalize(byte[] buf, int offset, int len) {
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byte[] translated = new byte[len];
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for (int j = 0; j < len; j++) {
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byte b = buf[offset + j];
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if (b == '.') translated[j] = (byte) '/';
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else translated[j] = b;
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}
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return translated;
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}
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/** Return external representation of given name,
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* converting '/' to '.'.
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*/
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public static byte[] externalize(Name name) {
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return externalize(name.getByteArray(), name.getByteOffset(), name.getByteLength());
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}
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/************************************************************************
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* Name-and-type
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***********************************************************************/
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/** A class for the name-and-type signature of a method or field.
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*/
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public static class NameAndType {
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Name name;
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UniqueType uniqueType;
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Types types;
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NameAndType(Name name, Type type, Types types) {
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this.name = name;
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this.uniqueType = new UniqueType(type, types);
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this.types = types;
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}
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void setType(Type type) {
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this.uniqueType = new UniqueType(type, types);
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}
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@Override
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public boolean equals(Object other) {
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return (other instanceof NameAndType &&
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name == ((NameAndType) other).name &&
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uniqueType.equals(((NameAndType) other).uniqueType));
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}
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@Override
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public int hashCode() {
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return name.hashCode() * uniqueType.hashCode();
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}
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}
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}
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