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/*
* Flags.java
*
* Copyright (c) 2012 Mike Strobel
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0.
* A copy of the license can be found in the License.html file at the root of this distribution.
* By using this source code in any fashion, you are agreeing to be bound by the terms of the
* Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*/
package com.strobel.reflection;
import com.strobel.util.ContractUtils;
import javax.lang.model.element.Modifier;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;
/**
* @author strobelm
*/
@SuppressWarnings("PointlessBitwiseExpression")
public class Flags {
private Flags() {
throw ContractUtils.unreachable();
}
public static String toString(final long flags) {
final StringBuilder buf = new StringBuilder();
String sep = "";
for (final Flag s : asFlagSet(flags)) {
buf.append(sep);
buf.append(s);
sep = " ";
}
return buf.toString();
}
@SuppressWarnings("ConstantConditions")
public static EnumSet asFlagSet(final long mask) {
final EnumSet flags = EnumSet.noneOf(Flag.class);
if ((mask & PUBLIC) != 0) {
flags.add(Flag.PUBLIC);
}
if ((mask & PRIVATE) != 0) {
flags.add(Flag.PRIVATE);
}
if ((mask & PROTECTED) != 0) {
flags.add(Flag.PROTECTED);
}
if ((mask & STATIC) != 0) {
flags.add(Flag.STATIC);
}
if ((mask & FINAL) != 0) {
flags.add(Flag.FINAL);
}
if ((mask & SYNCHRONIZED) != 0) {
flags.add(Flag.SYNCHRONIZED);
}
if ((mask & VOLATILE) != 0) {
flags.add(Flag.VOLATILE);
}
if ((mask & TRANSIENT) != 0) {
flags.add(Flag.TRANSIENT);
}
if ((mask & NATIVE) != 0) {
flags.add(Flag.NATIVE);
}
if ((mask & INTERFACE) != 0) {
flags.add(Flag.INTERFACE);
}
if ((mask & ABSTRACT) != 0) {
flags.add(Flag.ABSTRACT);
}
if ((mask & STRICTFP) != 0) {
flags.add(Flag.STRICTFP);
}
if ((mask & BRIDGE) != 0) {
flags.add(Flag.BRIDGE);
}
if ((mask & SYNTHETIC) != 0) {
flags.add(Flag.SYNTHETIC);
}
if ((mask & DEPRECATED) != 0) {
flags.add(Flag.DEPRECATED);
}
if ((mask & HASINIT) != 0) {
flags.add(Flag.HASINIT);
}
if ((mask & ENUM) != 0) {
flags.add(Flag.ENUM);
}
if ((mask & IPROXY) != 0) {
flags.add(Flag.IPROXY);
}
if ((mask & NOOUTERTHIS) != 0) {
flags.add(Flag.NOOUTERTHIS);
}
if ((mask & EXISTS) != 0) {
flags.add(Flag.EXISTS);
}
if ((mask & COMPOUND) != 0) {
flags.add(Flag.COMPOUND);
}
if ((mask & CLASS_SEEN) != 0) {
flags.add(Flag.CLASS_SEEN);
}
if ((mask & SOURCE_SEEN) != 0) {
flags.add(Flag.SOURCE_SEEN);
}
if ((mask & LOCKED) != 0) {
flags.add(Flag.LOCKED);
}
if ((mask & UNATTRIBUTED) != 0) {
flags.add(Flag.UNATTRIBUTED);
}
if ((mask & ANONCONSTR) != 0) {
flags.add(Flag.ANONCONSTR);
}
if ((mask & ACYCLIC) != 0) {
flags.add(Flag.ACYCLIC);
}
if ((mask & PARAMETER) != 0) {
flags.add(Flag.PARAMETER);
}
if ((mask & VARARGS) != 0) {
flags.add(Flag.VARARGS);
}
return flags;
}
/* Standard Java flags.
*/
public static final int PUBLIC = 1 << 0;
public static final int PRIVATE = 1 << 1;
public static final int PROTECTED = 1 << 2;
public static final int STATIC = 1 << 3;
public static final int FINAL = 1 << 4;
public static final int SYNCHRONIZED = 1 << 5;
public static final int VOLATILE = 1 << 6;
public static final int TRANSIENT = 1 << 7;
public static final int NATIVE = 1 << 8;
public static final int INTERFACE = 1 << 9;
public static final int ABSTRACT = 1 << 10;
public static final int STRICTFP = 1 << 11;
/* Flag that marks a symbol synthetic, added in classfile v49.0. */
public static final int SYNTHETIC = 1 << 12;
/**
* Flag that marks attribute interfaces, added in classfile v49.0.
*/
public static final int ANNOTATION = 1 << 13;
/**
* An enumeration type or an enumeration constant, added in
* classfile v49.0.
*/
public static final int ENUM = 1 << 14;
public static final int StandardFlags = 0x0fff;
public static final int ModifierFlags = StandardFlags & ~INTERFACE;
// Because the following access flags are overloaded with other
// bit positions, we translate them when reading and writing class
// files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC,
// for example.
public static final int ACC_SUPER = 0x0020;
public static final int ACC_BRIDGE = 0x0040;
public static final int ACC_VARARGS = 0x0080;
public static final int ACC_SYNTHETIC = 0x1000;
/*****************************************
* Internal compiler flags (no bits in the lower 16).
*****************************************/
/**
* Flag is set if symbol is deprecated.
*/
public static final int DEPRECATED = 1 << 17;
/**
* Flag is set for a variable symbol if the variable's definition
* has an initializer part.
*/
public static final int HASINIT = 1 << 18;
/**
* Flag is set for compiler-generated anonymous method symbols
* that `own' an initializer block.
*/
public static final int BLOCK = 1 << 20;
/**
* Flag is set for compiler-generated abstract methods that implement
* an interface method (Miranda methods).
*/
public static final int IPROXY = 1 << 21;
/**
* Flag is set for nested classes that do not access instance members
* or `this' of an outer class and therefore don't need to be passed
* a this$n reference. This flag is currently set only for anonymous
* classes in superclass constructor calls and only for pre 1.4 targets.
* todo: use this flag for optimizing away this$n parameters in
* other cases.
*/
public static final int NOOUTERTHIS = 1 << 22;
/**
* Flag is set for package symbols if a package has a member or
* directory and therefore exists.
*/
public static final int EXISTS = 1 << 23;
/**
* Flag is set for compiler-generated compound classes
* representing multiple variable bounds
*/
public static final int COMPOUND = 1 << 24;
/**
* Flag is set for class symbols if a class file was found for this class.
*/
public static final int CLASS_SEEN = 1 << 25;
/**
* Flag is set for class symbols if a source file was found for this
* class.
*/
public static final int SOURCE_SEEN = 1 << 26;
/* State flags (are reset during compilation).
*/
/**
* Flag for class symbols is set and later re-set as a lock in
* Enter to detect cycles in the superclass/superinterface
* relations. Similarly for constructor call cycle detection in
* Attr.
*/
public static final int LOCKED = 1 << 27;
/**
* Flag for class symbols is set and later re-set to indicate that a class
* has been entered but has not yet been attributed.
*/
public static final int UNATTRIBUTED = 1 << 28;
/**
* Flag for synthesized default constructors of anonymous classes.
*/
public static final int ANONCONSTR = 1 << 29;
/**
* Flag for class symbols to indicate it has been checked and found
* acyclic.
*/
public static final int ACYCLIC = 1 << 30;
/**
* Flag that marks bridge methods.
*/
public static final long BRIDGE = 1L << 31;
/**
* Flag that marks formal parameters.
*/
public static final long PARAMETER = 1L << 33;
/**
* Flag that marks varargs methods.
*/
public static final long VARARGS = 1L << 34;
/**
* Flag for annotation type symbols to indicate it has been
* checked and found acyclic.
*/
public static final long ACYCLIC_ANN = 1L << 35;
/**
* Flag that marks a generated default constructor.
*/
public static final long GENERATEDCONSTR = 1L << 36;
/**
* Flag that marks a hypothetical method that need not really be
* generated in the binary, but is present in the symbol table to
* simplify checking for erasure clashes - also used for 292 poly sig methods.
*/
public static final long HYPOTHETICAL = 1L << 37;
/**
* Flag that marks an internal proprietary class.
*/
public static final long PROPRIETARY = 1L << 38;
/**
* Flag that marks a a multi-catch parameter
*/
public static final long UNION = 1L << 39;
/**
* Flag that marks a special kind of bridge methods (the ones that
* come from restricted supertype bounds)
*/
public static final long OVERRIDE_BRIDGE = 1L << 40;
/**
* Flag that marks an 'effectively final' local variable
*/
public static final long EFFECTIVELY_FINAL = 1L << 41;
/**
* Flag that marks non-override equivalent methods with the same signature
*/
public static final long CLASH = 1L << 42;
/**
* Flag that marks either a default method or an interface containing default methods.
*/
public static final long DEFAULT = 1L<<43;
/**
* Modifier masks.
*/
public static final int
AccessFlags = PUBLIC | PROTECTED | PRIVATE,
LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,
MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
InterfaceVarFlags = FINAL | STATIC | PUBLIC,
VarFlags = AccessFlags | FINAL | STATIC |
VOLATILE | TRANSIENT | ENUM,
ConstructorFlags = AccessFlags,
InterfaceMethodFlags = ABSTRACT | PUBLIC,
MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
SYNCHRONIZED | FINAL | STRICTFP;
public static final long LocalVarFlags = FINAL | PARAMETER;
public static Set asModifierSet(final long flags) {
Set modifiers = modifierSets.get(flags);
if (modifiers == null) {
modifiers = java.util.EnumSet.noneOf(Modifier.class);
if (0 != (flags & PUBLIC)) {
modifiers.add(Modifier.PUBLIC);
}
if (0 != (flags & PROTECTED)) {
modifiers.add(Modifier.PROTECTED);
}
if (0 != (flags & PRIVATE)) {
modifiers.add(Modifier.PRIVATE);
}
if (0 != (flags & ABSTRACT)) {
modifiers.add(Modifier.ABSTRACT);
}
if (0 != (flags & STATIC)) {
modifiers.add(Modifier.STATIC);
}
if (0 != (flags & FINAL)) {
modifiers.add(Modifier.FINAL);
}
if (0 != (flags & TRANSIENT)) {
modifiers.add(Modifier.TRANSIENT);
}
if (0 != (flags & VOLATILE)) {
modifiers.add(Modifier.VOLATILE);
}
if (0 != (flags & SYNCHRONIZED)) {
modifiers.add(Modifier.SYNCHRONIZED);
}
if (0 != (flags & NATIVE)) {
modifiers.add(Modifier.NATIVE);
}
if (0 != (flags & STRICTFP)) {
modifiers.add(Modifier.STRICTFP);
}
modifiers = Collections.unmodifiableSet(modifiers);
modifierSets.put(flags, modifiers);
}
return modifiers;
}
public static boolean testAny(final int value, final int flags) {
return (value & flags) != 0;
}
public static boolean testAll(final int value, final int flags) {
return (value & flags) == flags;
}
public static boolean testAny(final long value, final long flags) {
return (value & flags) != 0;
}
public static boolean testAll(final long value, final long flags) {
return (value & flags) == flags;
}
// Cache of modifier sets.
private static final Map> modifierSets =
new java.util.concurrent.ConcurrentHashMap<>(64);
public static boolean isEnum(final MemberInfo symbol) {
return (symbol.getModifiers() & ENUM) != 0;
}
public enum Flag {
PUBLIC("public"),
PRIVATE("private"),
PROTECTED("protected"),
STATIC("static"),
FINAL("final"),
SYNCHRONIZED("synchronized"),
VOLATILE("volatile"),
TRANSIENT("transient"),
NATIVE("native"),
INTERFACE("interface"),
ABSTRACT("abstract"),
DEFAULT("default"),
STRICTFP("strictfp"),
SUPER("super"),
BRIDGE("bridge"),
SYNTHETIC("synthetic"),
DEPRECATED("deprecated"),
HASINIT("hasinit"),
ENUM("enum"),
MANDATED("mandated"),
IPROXY("iproxy"),
NOOUTERTHIS("noouterthis"),
EXISTS("exists"),
COMPOUND("compound"),
CLASS_SEEN("class_seen"),
SOURCE_SEEN("source_seen"),
LOCKED("locked"),
UNATTRIBUTED("unattributed"),
ANONCONSTR("anonconstr"),
ACYCLIC("acyclic"),
PARAMETER("parameter"),
VARARGS("varargs"),
PACKAGE("package");
public final String name;
Flag(final String name) {
this.name = name;
}
public String toString() {
return name;
}
}
}
