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/*
 * Copyright (c) 2007, 2015, 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
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 */

package com.sun.tools.classfile;

import java.io.IOException;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * See JVMS, sections 4.2, 4.6, 4.7.
 *
 *  

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. */ public class AccessFlags { public static final int ACC_PUBLIC = 0x0001; // class, inner, field, method public static final int ACC_PRIVATE = 0x0002; // inner, field, method public static final int ACC_PROTECTED = 0x0004; // inner, field, method public static final int ACC_STATIC = 0x0008; // inner, field, method public static final int ACC_FINAL = 0x0010; // class, inner, field, method public static final int ACC_SUPER = 0x0020; // class public static final int ACC_SYNCHRONIZED = 0x0020; // method public static final int ACC_VOLATILE = 0x0040; // field public static final int ACC_BRIDGE = 0x0040; // method public static final int ACC_TRANSIENT = 0x0080; // field public static final int ACC_VARARGS = 0x0080; // method public static final int ACC_NATIVE = 0x0100; // method public static final int ACC_INTERFACE = 0x0200; // class, inner public static final int ACC_ABSTRACT = 0x0400; // class, inner, method public static final int ACC_STRICT = 0x0800; // method public static final int ACC_SYNTHETIC = 0x1000; // class, inner, field, method public static final int ACC_ANNOTATION = 0x2000; // class, inner public static final int ACC_ENUM = 0x4000; // class, inner, field public static final int ACC_MANDATED = 0x8000; // method parameter public static final int ACC_MODULE = 0x8000; // class public static enum Kind { Class, InnerClass, Field, Method} AccessFlags(ClassReader cr) throws IOException { this(cr.readUnsignedShort()); } public AccessFlags(int flags) { this.flags = flags; } public AccessFlags ignore(int mask) { return new AccessFlags(flags & ~mask); } public boolean is(int mask) { return (flags & mask) != 0; } public int byteLength() { return 2; } private static final int[] classModifiers = { ACC_PUBLIC, ACC_FINAL, ACC_ABSTRACT }; private static final int[] classFlags = { ACC_PUBLIC, ACC_FINAL, ACC_SUPER, ACC_INTERFACE, ACC_ABSTRACT, ACC_SYNTHETIC, ACC_ANNOTATION, ACC_ENUM, ACC_MODULE }; public Set getClassModifiers() { int f = ((flags & ACC_INTERFACE) != 0 ? flags & ~ACC_ABSTRACT : flags); return getModifiers(f, classModifiers, Kind.Class); } public Set getClassFlags() { return getFlags(classFlags, Kind.Class); } private static final int[] innerClassModifiers = { ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_ABSTRACT }; private static final int[] innerClassFlags = { ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_SUPER, ACC_INTERFACE, ACC_ABSTRACT, ACC_SYNTHETIC, ACC_ANNOTATION, ACC_ENUM }; public Set getInnerClassModifiers() { int f = ((flags & ACC_INTERFACE) != 0 ? flags & ~ACC_ABSTRACT : flags); return getModifiers(f, innerClassModifiers, Kind.InnerClass); } public Set getInnerClassFlags() { return getFlags(innerClassFlags, Kind.InnerClass); } private static final int[] fieldModifiers = { ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_VOLATILE, ACC_TRANSIENT }; private static final int[] fieldFlags = { ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_VOLATILE, ACC_TRANSIENT, ACC_SYNTHETIC, ACC_ENUM }; public Set getFieldModifiers() { return getModifiers(fieldModifiers, Kind.Field); } public Set getFieldFlags() { return getFlags(fieldFlags, Kind.Field); } private static final int[] methodModifiers = { ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_SYNCHRONIZED, ACC_NATIVE, ACC_ABSTRACT, ACC_STRICT }; private static final int[] methodFlags = { ACC_PUBLIC, ACC_PRIVATE, ACC_PROTECTED, ACC_STATIC, ACC_FINAL, ACC_SYNCHRONIZED, ACC_BRIDGE, ACC_VARARGS, ACC_NATIVE, ACC_ABSTRACT, ACC_STRICT, ACC_SYNTHETIC }; public Set getMethodModifiers() { return getModifiers(methodModifiers, Kind.Method); } public Set getMethodFlags() { return getFlags(methodFlags, Kind.Method); } private Set getModifiers(int[] modifierFlags, Kind t) { return getModifiers(flags, modifierFlags, t); } private static Set getModifiers(int flags, int[] modifierFlags, Kind t) { Set s = new LinkedHashSet<>(); for (int m: modifierFlags) { if ((flags & m) != 0) s.add(flagToModifier(m, t)); } return s; } private Set getFlags(int[] expectedFlags, Kind t) { Set s = new LinkedHashSet<>(); int f = flags; for (int e: expectedFlags) { if ((f & e) != 0) { s.add(flagToName(e, t)); f = f & ~e; } } while (f != 0) { int bit = Integer.highestOneBit(f); s.add("0x" + Integer.toHexString(bit)); f = f & ~bit; } return s; } private static String flagToModifier(int flag, Kind t) { switch (flag) { case ACC_PUBLIC: return "public"; case ACC_PRIVATE: return "private"; case ACC_PROTECTED: return "protected"; case ACC_STATIC: return "static"; case ACC_FINAL: return "final"; case ACC_SYNCHRONIZED: return "synchronized"; case 0x80: return (t == Kind.Field ? "transient" : null); case ACC_VOLATILE: return "volatile"; case ACC_NATIVE: return "native"; case ACC_ABSTRACT: return "abstract"; case ACC_STRICT: return "strictfp"; case ACC_MANDATED: return "mandated"; default: return null; } } private static String flagToName(int flag, Kind t) { switch (flag) { case ACC_PUBLIC: return "ACC_PUBLIC"; case ACC_PRIVATE: return "ACC_PRIVATE"; case ACC_PROTECTED: return "ACC_PROTECTED"; case ACC_STATIC: return "ACC_STATIC"; case ACC_FINAL: return "ACC_FINAL"; case 0x20: return (t == Kind.Class ? "ACC_SUPER" : "ACC_SYNCHRONIZED"); case 0x40: return (t == Kind.Field ? "ACC_VOLATILE" : "ACC_BRIDGE"); case 0x80: return (t == Kind.Field ? "ACC_TRANSIENT" : "ACC_VARARGS"); case ACC_NATIVE: return "ACC_NATIVE"; case ACC_INTERFACE: return "ACC_INTERFACE"; case ACC_ABSTRACT: return "ACC_ABSTRACT"; case ACC_STRICT: return "ACC_STRICT"; case ACC_SYNTHETIC: return "ACC_SYNTHETIC"; case ACC_ANNOTATION: return "ACC_ANNOTATION"; case ACC_ENUM: return "ACC_ENUM"; case 0x8000: return (t == Kind.Class ? "ACC_MODULE" : "ACC_MANDATED"); default: return null; } } public final int flags; }





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