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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.snapscript.dx.rop.code;
import org.snapscript.dx.util.Hex;
/**
* Constants used as "access flags" in various places in classes, and
* related utilities. Although, at the rop layer, flags are generally
* ignored, this is the layer of communication, and as such, this
* package is where these definitions belong. The flag definitions are
* identical to Java access flags, but {@code ACC_SUPER} isn't
* used at all in translated code, and {@code ACC_SYNCHRONIZED}
* is only used in a very limited way.
*/
public final class AccessFlags {
/** public member / class */
public static final int ACC_PUBLIC = 0x0001;
/** private member */
public static final int ACC_PRIVATE = 0x0002;
/** protected member */
public static final int ACC_PROTECTED = 0x0004;
/** static member */
public static final int ACC_STATIC = 0x0008;
/** final member / class */
public static final int ACC_FINAL = 0x0010;
/**
* synchronized method; only valid in dex files for {@code native}
* methods
*/
public static final int ACC_SYNCHRONIZED = 0x0020;
/**
* class with new-style {@code invokespecial} for superclass
* method access
*/
public static final int ACC_SUPER = 0x0020;
/** volatile field */
public static final int ACC_VOLATILE = 0x0040;
/** bridge method (generated) */
public static final int ACC_BRIDGE = 0x0040;
/** transient field */
public static final int ACC_TRANSIENT = 0x0080;
/** varargs method */
public static final int ACC_VARARGS = 0x0080;
/** native method */
public static final int ACC_NATIVE = 0x0100;
/** "class" is in fact an public static final interface */
public static final int ACC_INTERFACE = 0x0200;
/** abstract method / class */
public static final int ACC_ABSTRACT = 0x0400;
/**
* method with strict floating point ({@code strictfp})
* behavior
*/
public static final int ACC_STRICT = 0x0800;
/** synthetic member */
public static final int ACC_SYNTHETIC = 0x1000;
/** class is an annotation type */
public static final int ACC_ANNOTATION = 0x2000;
/**
* class is an enumerated type; field is an element of an enumerated
* type
*/
public static final int ACC_ENUM = 0x4000;
/** method is a constructor */
public static final int ACC_CONSTRUCTOR = 0x10000;
/**
* method was declared {@code synchronized}; has no effect on
* execution (other than inspecting this flag, per se)
*/
public static final int ACC_DECLARED_SYNCHRONIZED = 0x20000;
/** flags defined on classes */
public static final int CLASS_FLAGS =
ACC_PUBLIC | ACC_FINAL | ACC_SUPER | ACC_INTERFACE | ACC_ABSTRACT |
ACC_SYNTHETIC | ACC_ANNOTATION | ACC_ENUM;
/** flags defined on inner classes */
public static final int INNER_CLASS_FLAGS =
ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL |
ACC_INTERFACE | ACC_ABSTRACT | ACC_SYNTHETIC | ACC_ANNOTATION |
ACC_ENUM;
/** flags defined on fields */
public static final int FIELD_FLAGS =
ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL |
ACC_VOLATILE | ACC_TRANSIENT | ACC_SYNTHETIC | ACC_ENUM;
/** flags defined on methods */
public static final int METHOD_FLAGS =
ACC_PUBLIC | ACC_PRIVATE | ACC_PROTECTED | ACC_STATIC | ACC_FINAL |
ACC_SYNCHRONIZED | ACC_BRIDGE | ACC_VARARGS | ACC_NATIVE |
ACC_ABSTRACT | ACC_STRICT | ACC_SYNTHETIC | ACC_CONSTRUCTOR |
ACC_DECLARED_SYNCHRONIZED;
/** indicates conversion of class flags */
private static final int CONV_CLASS = 1;
/** indicates conversion of field flags */
private static final int CONV_FIELD = 2;
/** indicates conversion of method flags */
private static final int CONV_METHOD = 3;
/**
* This class is uninstantiable.
*/
private AccessFlags() {
// This space intentionally left blank.
}
/**
* Returns a human-oriented string representing the given access flags,
* as defined on classes (not fields or methods).
*
* @param flags the flags
* @return {@code non-null;} human-oriented string
*/
public static String classString(int flags) {
return humanHelper(flags, CLASS_FLAGS, CONV_CLASS);
}
/**
* Returns a human-oriented string representing the given access flags,
* as defined on inner classes.
*
* @param flags the flags
* @return {@code non-null;} human-oriented string
*/
public static String innerClassString(int flags) {
return humanHelper(flags, INNER_CLASS_FLAGS, CONV_CLASS);
}
/**
* Returns a human-oriented string representing the given access flags,
* as defined on fields (not classes or methods).
*
* @param flags the flags
* @return {@code non-null;} human-oriented string
*/
public static String fieldString(int flags) {
return humanHelper(flags, FIELD_FLAGS, CONV_FIELD);
}
/**
* Returns a human-oriented string representing the given access flags,
* as defined on methods (not classes or fields).
*
* @param flags the flags
* @return {@code non-null;} human-oriented string
*/
public static String methodString(int flags) {
return humanHelper(flags, METHOD_FLAGS, CONV_METHOD);
}
/**
* Returns whether the flag {@code ACC_PUBLIC} is on in the given
* flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_PUBLIC} flag
*/
public static boolean isPublic(int flags) {
return (flags & ACC_PUBLIC) != 0;
}
/**
* Returns whether the flag {@code ACC_PROTECTED} is on in the given
* flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_PROTECTED} flag
*/
public static boolean isProtected(int flags) {
return (flags & ACC_PROTECTED) != 0;
}
/**
* Returns whether the flag {@code ACC_PRIVATE} is on in the given
* flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_PRIVATE} flag
*/
public static boolean isPrivate(int flags) {
return (flags & ACC_PRIVATE) != 0;
}
/**
* Returns whether the flag {@code ACC_STATIC} is on in the given
* flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_STATIC} flag
*/
public static boolean isStatic(int flags) {
return (flags & ACC_STATIC) != 0;
}
/**
* Returns whether the flag {@code ACC_SYNCHRONIZED} is on in
* the given flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_SYNCHRONIZED} flag
*/
public static boolean isSynchronized(int flags) {
return (flags & ACC_SYNCHRONIZED) != 0;
}
/**
* Returns whether the flag {@code ACC_ABSTRACT} is on in the given
* flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_ABSTRACT} flag
*/
public static boolean isAbstract(int flags) {
return (flags & ACC_ABSTRACT) != 0;
}
/**
* Returns whether the flag {@code ACC_NATIVE} is on in the given
* flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_NATIVE} flag
*/
public static boolean isNative(int flags) {
return (flags & ACC_NATIVE) != 0;
}
/**
* Returns whether the flag {@code ACC_ANNOTATION} is on in the given
* flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_ANNOTATION} flag
*/
public static boolean isAnnotation(int flags) {
return (flags & ACC_ANNOTATION) != 0;
}
/**
* Returns whether the flag {@code ACC_DECLARED_SYNCHRONIZED} is
* on in the given flags.
*
* @param flags the flags to check
* @return the value of the {@code ACC_DECLARED_SYNCHRONIZED} flag
*/
public static boolean isDeclaredSynchronized(int flags) {
return (flags & ACC_DECLARED_SYNCHRONIZED) != 0;
}
/**
* Helper to return a human-oriented string representing the given
* access flags.
*
* @param flags the defined flags
* @param mask mask for the "defined" bits
* @param what what the flags represent (one of {@code CONV_*})
* @return {@code non-null;} human-oriented string
*/
private static String humanHelper(int flags, int mask, int what) {
StringBuffer sb = new StringBuffer(80);
int extra = flags & ~mask;
flags &= mask;
if ((flags & ACC_PUBLIC) != 0) {
sb.append("|public");
}
if ((flags & ACC_PRIVATE) != 0) {
sb.append("|private");
}
if ((flags & ACC_PROTECTED) != 0) {
sb.append("|protected");
}
if ((flags & ACC_STATIC) != 0) {
sb.append("|static");
}
if ((flags & ACC_FINAL) != 0) {
sb.append("|final");
}
if ((flags & ACC_SYNCHRONIZED) != 0) {
if (what == CONV_CLASS) {
sb.append("|super");
} else {
sb.append("|synchronized");
}
}
if ((flags & ACC_VOLATILE) != 0) {
if (what == CONV_METHOD) {
sb.append("|bridge");
} else {
sb.append("|volatile");
}
}
if ((flags & ACC_TRANSIENT) != 0) {
if (what == CONV_METHOD) {
sb.append("|varargs");
} else {
sb.append("|transient");
}
}
if ((flags & ACC_NATIVE) != 0) {
sb.append("|native");
}
if ((flags & ACC_INTERFACE) != 0) {
sb.append("|interface");
}
if ((flags & ACC_ABSTRACT) != 0) {
sb.append("|abstract");
}
if ((flags & ACC_STRICT) != 0) {
sb.append("|strictfp");
}
if ((flags & ACC_SYNTHETIC) != 0) {
sb.append("|synthetic");
}
if ((flags & ACC_ANNOTATION) != 0) {
sb.append("|annotation");
}
if ((flags & ACC_ENUM) != 0) {
sb.append("|enum");
}
if ((flags & ACC_CONSTRUCTOR) != 0) {
sb.append("|constructor");
}
if ((flags & ACC_DECLARED_SYNCHRONIZED) != 0) {
sb.append("|declared_synchronized");
}
if ((extra != 0) || (sb.length() == 0)) {
sb.append('|');
sb.append(Hex.u2(extra));
}
return sb.substring(1);
}
}
