/* NSC -- new Scala compiler
* Copyright 2005-2006 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
/* Ideas to extend this to an icode reader:
*
* 1. Parse classfile a second time, creating a hashmap `code' that
* associates method symbols with code.
* 2. For every method symbol `meth' in the new scope:
*
* new = oldclass.info.decl(meth.name).suchThat(old => old.tpe =:= meth.tpe)
*
* code(new) = code(meth)
*/
package scala.tools.nsc.symtab.classfile
import scala.tools.nsc.util.Position
import scala.tools.nsc.io.{AbstractFile, AbstractFileReader}
import scala.collection.mutable.{ListBuffer, ArrayBuffer}
import scala.collection.immutable.{Map, ListMap}
import java.io.IOException
/** This abstract class implements a class file parser.
*
* @author Martin Odersky
* @version 1.0
*/
abstract class ClassfileParser {
def sourcePath : AbstractFile = null
val global: Global
import global._
import ClassfileConstants._
import Flags._
protected var in: AbstractFileReader = _ // the class file reader
protected var clazz: Symbol = _ // the class symbol containing dynamic members
protected var staticModule: Symbol = _ // the module symbol containing static members
protected var instanceDefs: Scope = _ // the scope of all instance definitions
protected var staticDefs: Scope = _ // the scope of all static definitions
protected var pool: ConstantPool = _ // the classfile's constant pool
protected var isScala: boolean = _ // does class file describe a scala class?
protected var hasMeta: boolean = _ // does class file contain jaco meta attribute?s
protected var busy: boolean = false // lock to detect recursive reads
protected var classTParams: Map[Name,Symbol] =
collection.immutable.ListMap.Empty[Name,Symbol]
protected val fresh = new scala.tools.nsc.util.FreshNameCreator
private object metaParser extends MetaParser {
val global: ClassfileParser.this.global.type = ClassfileParser.this.global
}
private object unpickler extends UnPickler {
val global: ClassfileParser.this.global.type = ClassfileParser.this.global
}
def parse(file: AbstractFile, root: Symbol): unit = {
def handleError(e: Exception) = {
if (settings.debug.value) e.printStackTrace();//debug
throw new IOException("class file '" + in.file + "' is broken\n(" + e.getMessage() + ")")
}
assert(!busy)
busy = true
if (root.isInstanceOf[ClassSymbol]) {
root.asInstanceOf[ClassSymbol].classFile = file
}
this.in = new AbstractFileReader(file)
if (root.isModule) {
this.clazz = root.linkedClass
this.staticModule = root
} else {
this.clazz = root
this.staticModule = root.linkedModule
}
this.isScala = false
this.hasMeta = false
try {
parseHeader
this.pool = new ConstantPool
parseClass()
} catch {
case e: FatalError => handleError(e)
case e: RuntimeException => handleError(e)
}
busy = false
}
protected def statics: Symbol = staticModule.moduleClass
private def parseHeader: unit = {
val magic = in.nextInt
if (magic != JAVA_MAGIC)
throw new IOException("class file '" + in.file + "' "
+ "has wrong magic number 0x" + Integer.toHexString(magic)
+ ", should be 0x" + Integer.toHexString(JAVA_MAGIC))
val minorVersion = in.nextChar
val majorVersion = in.nextChar
if ((majorVersion < JAVA_MAJOR_VERSION) ||
((majorVersion == JAVA_MAJOR_VERSION) &&
(minorVersion < JAVA_MINOR_VERSION)))
throw new IOException("class file '" + in.file + "' "
+ "has unknown version "
+ majorVersion + "." + minorVersion
+ ", should be at least "
+ JAVA_MAJOR_VERSION + "." + JAVA_MINOR_VERSION)
}
class ConstantPool {
private val len = in.nextChar
private val starts = new Array[int](len)
private val values = new Array[Object](len)
private val internalized = new Array[Name](len)
{ var i = 1
while (i < starts.length) {
starts(i) = in.bp
i = i + 1
in.nextByte match {
case CONSTANT_UTF8 | CONSTANT_UNICODE =>
in.skip(in.nextChar)
case CONSTANT_CLASS | CONSTANT_STRING =>
in.skip(2)
case CONSTANT_FIELDREF | CONSTANT_METHODREF | CONSTANT_INTFMETHODREF
| CONSTANT_NAMEANDTYPE | CONSTANT_INTEGER | CONSTANT_FLOAT =>
in.skip(4)
case CONSTANT_LONG | CONSTANT_DOUBLE =>
in.skip(8)
i = i + 1
case _ =>
errorBadTag(in.bp - 1)
}
}
}
def getName(index: int): Name = {
if (index <= 0 || len <= index) errorBadIndex(index)
var name = values(index).asInstanceOf[Name]
if (name == null) {
val start = starts(index)
if (in.buf(start) != CONSTANT_UTF8) errorBadTag(start)
name = newTermName(in.buf, start + 3, in.getChar(start + 1))
values(index) = name
}
name
}
def getExternalName(index: int): Name = {
if (index <= 0 || len <= index) errorBadIndex(index)
if (internalized(index) == null) {
internalized(index) = getName(index).replace('/', '.')
}
internalized(index)
}
def getClassSymbol(index: int): Symbol = {
if (index <= 0 || len <= index) errorBadIndex(index)
var c = values(index).asInstanceOf[Symbol]
if (c == null) {
val start = starts(index)
if (in.buf(start) != CONSTANT_CLASS) errorBadTag(start)
val name = getExternalName(in.getChar(start + 1))
if (name.pos('.') == name.length)
c = definitions.getMember(definitions.EmptyPackageClass, name.toTypeName)
else
c = definitions.getClass(name)
values(index) = c
}
c
}
def getMemberSymbol(index: Int, static: Boolean): Symbol = {
if (index <= 0 || len <= index) errorBadIndex(index)
var f = values(index).asInstanceOf[Symbol]
if (f == null) {
val start = starts(index)
if (in.buf(start) != CONSTANT_FIELDREF &&
in.buf(start) != CONSTANT_METHODREF &&
in.buf(start) != CONSTANT_INTFMETHODREF) errorBadTag(start)
val cls = getClassSymbol(in.getChar(start + 1))
val Pair(name, tpe) = getNameAndType(in.getChar(start + 3), cls);
f = ((if (static) cls.linkedModule.moduleClass else cls)
.info.decl(name).suchThat(s => s.tpe =:= tpe));
assert(f != NoSymbol, "Could not find symbol for " + name + ": " + tpe + " in " + cls);
values(index) = f
}
f
}
def getNameAndType(index: Int, ownerClass: Symbol): Pair[Name, Type] = {
if (index <= 0 || len <= index) errorBadIndex(index)
var p = values(index).asInstanceOf[Pair[Name, Type]]
if (p == null) {
val start = starts(index)
if (in.buf(start) != CONSTANT_NAMEANDTYPE) errorBadTag(start)
val name = getName(in.getChar(start + 1))
var tpe = getType(in.getChar(start + 3))
if (name == nme.CONSTRUCTOR)
tpe match {
case MethodType(formals, restpe) =>
assert(restpe.symbol == definitions.UnitClass)
tpe = MethodType(formals, ownerClass.tpe)
}
p = Pair(name, tpe)
}
p
}
def getType(index: int): Type =
sigToType(getExternalName(index))
def getSuperClass(index: int): Symbol =
if (index == 0) definitions.AnyClass else getClassSymbol(index)
def getConstant(index: int): Constant = {
if (index <= 0 || len <= index) errorBadIndex(index)
var value = values(index)
if (value == null) {
val start = starts(index)
value = in.buf(start) match {
case CONSTANT_STRING =>
Constant(getName(in.getChar(start + 1)).toString())
case CONSTANT_INTEGER =>
Constant(in.getInt(start + 1))
case CONSTANT_FLOAT =>
Constant(in.getFloat(start + 1))
case CONSTANT_LONG =>
Constant(in.getLong(start + 1))
case CONSTANT_DOUBLE =>
Constant(in.getDouble(start + 1))
case _ =>
errorBadTag(start)
}
values(index) = value
}
value.asInstanceOf[Constant]
}
/** Throws an exception signaling a bad constant index. */
private def errorBadIndex(index: int) =
throw new RuntimeException("bad constant pool index: " + index + " at pos: " + in.bp)
/** Throws an exception signaling a bad tag at given address. */
private def errorBadTag(start: int) =
throw new RuntimeException("bad constant pool tag " + in.buf(start) + " at byte " + start)
}
private def sigToType(name: Name): Type = {
var index = 0
val end = name.length
def objToAny(tp: Type): Type =
if (!global.phase.erasedTypes && tp.symbol == definitions.ObjectClass) definitions.AnyClass.tpe
else tp
def paramsigs2types: List[Type] =
if (name(index) == ')') { index = index + 1; List() }
else objToAny(sig2type) :: paramsigs2types
def sig2type: Type = {
val tag = name(index); index = index + 1
tag match {
case BYTE_TAG => definitions.ByteClass.tpe
case CHAR_TAG => definitions.CharClass.tpe
case DOUBLE_TAG => definitions.DoubleClass.tpe
case FLOAT_TAG => definitions.FloatClass.tpe
case INT_TAG => definitions.IntClass.tpe
case LONG_TAG => definitions.LongClass.tpe
case SHORT_TAG => definitions.ShortClass.tpe
case VOID_TAG => definitions.UnitClass.tpe
case BOOL_TAG => definitions.BooleanClass.tpe
case 'L' =>
val start = index
while (name(index) != ';') { index = index + 1 }
val end = index
index = index + 1
definitions.getClass(name.subName(start, end)).tpe
case ARRAY_TAG =>
while ('0' <= name(index) && name(index) <= '9') index = index + 1
appliedType(definitions.ArrayClass.tpe, List(sig2type))
case '(' =>
JavaMethodType(paramsigs2types, sig2type)
}
}
sig2type
}
def parseClass(): unit = {
val jflags = in.nextChar
val isAttribute = (jflags & JAVA_ACC_ANNOTATION) != 0
var sflags = transFlags(jflags)
if ((sflags & DEFERRED) != 0) sflags = sflags & ~DEFERRED | ABSTRACT
val c = pool.getClassSymbol(in.nextChar)
if (c != clazz)
throw new IOException("class file '" + in.file + "' contains wrong " + clazz)
val superType = if (isAttribute) { in.nextChar; definitions.AttributeClass.tpe }
else pool.getSuperClass(in.nextChar).tpe
val ifaceCount = in.nextChar
val parents = (superType ::
(for (val i <- List.range(0, ifaceCount))
yield pool.getSuperClass(in.nextChar).tpe))
instanceDefs = new Scope()
staticDefs = new Scope()
val classInfo = ClassInfoType(parents, instanceDefs, clazz)
val staticInfo = ClassInfoType(List(), staticDefs, statics)
val curbp = in.bp
skipMembers() // fields
skipMembers() // methods
parseAttributes(clazz, classInfo)
if (!isScala) {
clazz.setFlag(sflags)
setPrivateWithin(clazz, jflags)
if (!hasMeta) {
clazz.setInfo(classInfo)
}
statics.setInfo(staticInfo)
staticModule.setInfo(statics.tpe)
staticModule.setFlag(JAVA)
staticModule.moduleClass.setFlag(JAVA)
in.bp = curbp
val fieldCount = in.nextChar
for (val i <- 0 until fieldCount) parseField()
val methodCount = in.nextChar
for (val i <- 0 until methodCount) parseMethod()
if ((instanceDefs.lookup(nme.CONSTRUCTOR) == NoSymbol &&
(sflags & INTERFACE) == 0))
{
//System.out.println("adding constructor to " + clazz);//DEBUG
instanceDefs.enter(
clazz.newConstructor(Position.NOPOS)
.setFlag(clazz.flags & ConstrFlags)
.setInfo(MethodType(List(), clazz.tpe)))
// If the annotation has an attribute with name 'value'
// add a constructor for it
if (isAttribute) {
val value = instanceDefs.lookup(nme.value)
if (value != NoSymbol) {
instanceDefs.enter(
clazz.newConstructor(Position.NOPOS)
.setFlag(clazz.flags & ConstrFlags)
.setInfo(MethodType(List(value.tpe.resultType), clazz.tpe)))
}
}
}
}
}
def parseField(): unit = {
val jflags = in.nextChar
var sflags = transFlags(jflags)
if ((sflags & FINAL) == 0) sflags = sflags | MUTABLE
if ((sflags & PRIVATE) != 0) {
in.skip(4); skipAttributes()
} else {
val name = pool.getName(in.nextChar)
val info = pool.getType(in.nextChar)
val sym = getOwner(jflags)
.newValue(Position.NOPOS, name).setFlag(sflags)
sym.setInfo(if ((jflags & JAVA_ACC_ENUM) == 0) info else ConstantType(Constant(sym)))
setPrivateWithin(sym, jflags)
parseAttributes(sym, info)
getScope(jflags).enter(sym)
}
}
def parseMethod(): unit = {
val jflags = in.nextChar
var sflags = transFlags(jflags)
if ((jflags & JAVA_ACC_BRIDGE) != 0) sflags = sflags | PRIVATE
if ((sflags & PRIVATE) != 0) {
in.skip(4); skipAttributes()
} else {
val name = pool.getName(in.nextChar)
var info = pool.getType(in.nextChar)
if (name == nme.CONSTRUCTOR)
info match {
case MethodType(formals, restpe) =>
assert(restpe.symbol == definitions.UnitClass)
info = MethodType(formals, clazz.tpe)
}
val sym = getOwner(jflags)
.newMethod(Position.NOPOS, name).setFlag(sflags).setInfo(info)
setPrivateWithin(sym, jflags)
parseAttributes(sym, info)
getScope(jflags).enter(sym)
}
}
// returns the generic type represented by the signature
private def polySigToType(sym: Symbol, sig: Name): Type =
try { polySigToType0(sym, sig) }
catch {
case e: Throwable => System.err.println("" + sym + " - " + sig); throw e
}
private def polySigToType0(sym: Symbol, sig: Name): Type = {
var index = 0
val end = sig.length
val newTParams = new ListBuffer[Symbol]()
def objToAny(tp: Type): Type =
if (tp.symbol == definitions.ObjectClass) definitions.AnyClass.tpe
else tp
def subName(isDelimiter: Char => Boolean): Name = {
val start = index
while (!isDelimiter(sig(index))) { index = index + 1; }
sig.subName(start, index)
}
def typeParams(tparams: Map[Name,Symbol], covariant: Boolean): List[Type] = {
assert(sig(index) == '<')
index = index + 1
val xs = new ListBuffer[Type]()
while (sig(index) != '>') {
sig(index) match {
case variance @ ('+' | '-' | '*') =>
index = index + 1
val bounds = variance match {
case '+' => TypeBounds(definitions.AllRefClass.typeConstructor,
sig2type(tparams, covariant))
case '-' => TypeBounds(sig2type(tparams, covariant),
definitions.AnyRefClass.typeConstructor)
case '*' => TypeBounds(definitions.AllRefClass.typeConstructor,
definitions.AnyRefClass.typeConstructor)
}
val name = fresh.newName("T_" + sym.name)
val newtparam =
if (covariant) clazz.newAbstractType(Position.NOPOS, name)
else {
val s = sym.newTypeParameter(Position.NOPOS, name)
newTParams += s
s
}
newtparam.setInfo(bounds)
xs += newtparam.tpe
case _ => xs += sig2type(tparams, covariant)
}
}
index = index + 1
xs.toList
}
def sig2type(tparams: Map[Name,Symbol], covariant: Boolean): Type = {
val tag = sig(index); index = index + 1
tag match {
case BYTE_TAG => definitions.ByteClass.tpe
case CHAR_TAG => definitions.CharClass.tpe
case DOUBLE_TAG => definitions.DoubleClass.tpe
case FLOAT_TAG => definitions.FloatClass.tpe
case INT_TAG => definitions.IntClass.tpe
case LONG_TAG => definitions.LongClass.tpe
case SHORT_TAG => definitions.ShortClass.tpe
case VOID_TAG => definitions.UnitClass.tpe
case BOOL_TAG => definitions.BooleanClass.tpe
case 'L' =>
var tpe = definitions.getClass(subName(c => ((c == ';') || (c == '<')))).tpe
if (sig(index) == '<')
tpe = appliedType(tpe, typeParams(tparams, covariant))
index = index + 1
tpe
case ARRAY_TAG =>
while ('0' <= sig(index) && sig(index) <= '9') index = index + 1
appliedType(definitions.ArrayClass.tpe, List(sig2type(tparams, covariant)))
case '(' =>
val paramtypes = new ListBuffer[Type]()
while (sig(index) != ')') {
paramtypes += objToAny(sig2type(tparams, false))
}
index = index + 1
val restype = if (sym.isConstructor) {
assert(sig(index) == 'V')
index = index + 1
clazz.tpe
} else
sig2type(tparams, true)
MethodType(paramtypes.toList, restype)
case 'T' =>
val n = subName(';'.==).toTypeName
index = index + 1
tparams(n).typeConstructor
}
}
var tparams = classTParams
if (sig(index) == '<') {
index = index + 1
while (sig(index) != '>') {
val tpname = subName(':'.==).toTypeName
val s = sym.newTypeParameter(Position.NOPOS, tpname)
tparams = tparams + tpname -> s
val ts = new ListBuffer[Type]
while (sig(index) == ':') {
index = index + 1
if (sig(index) != ':') // guard against empty class bound
ts += sig2type(tparams, false)
}
s.setInfo(TypeBounds(definitions.AllRefClass.typeConstructor,
intersectionType(ts.toList, sym)))
newTParams += s
}
index = index + 1
}
val tpe =
if (sym.isClass) {
classTParams = tparams
val parents = new ListBuffer[Type]()
while (index < end) {
parents += sig2type(tparams, true); // here the variance doesnt'matter
}
ClassInfoType(parents.toList, instanceDefs, sym)
}
else
sig2type(tparams, true)
if (newTParams.length == 0) tpe
else PolyType(newTParams.toList, tpe)
}
def parseAttributes(sym: Symbol, symtype: Type): unit = {
def convertTo(c: Constant, pt: Type): Constant = {
if (pt.symbol == definitions.BooleanClass && c.tag == IntTag)
Constant(c.value != 0)
else
c convertTo pt
}
def parseAttribute(): unit = {
val attrName = pool.getName(in.nextChar)
val attrLen = in.nextInt
val oldpb = in.bp;
attrName match {
case nme.SignatureATTR =>
if (global.settings.Xgenerics.value) {
val sig = pool.getExternalName(in.nextChar)
val newType = polySigToType(sym, sig)
sym.setInfo(newType)
if (settings.debug.value)
global.inform("" + sym + "; signatire = " + sig + " type = " + newType)
hasMeta = true
} else
in.skip(attrLen)
case nme.SyntheticATTR =>
sym.setFlag(SYNTHETIC)
in.skip(attrLen)
case nme.BridgeATTR =>
sym.setFlag(BRIDGE)
in.skip(attrLen)
case nme.DeprecatedATTR =>
sym.setFlag(DEPRECATED)
in.skip(attrLen)
case nme.ConstantValueATTR =>
val c = pool.getConstant(in.nextChar)
val c1 = convertTo(c, symtype)
if (c1 != null) sym.setInfo(ConstantType(c1))
else System.out.println("failure to convert "+c+" to "+symtype);//debug
case nme.InnerClassesATTR =>
if (!isScala) parseInnerClasses() else in.skip(attrLen)
case nme.ScalaSignatureATTR =>
unpickler.unpickle(in.buf, in.bp, clazz, staticModule, in.file.toString())
in.skip(attrLen);
this.isScala = true
case nme.JacoMetaATTR =>
val meta = pool.getName(in.nextChar).toString().trim()
metaParser.parse(meta, sym, symtype)
this.hasMeta = true
case nme.SourceFileATTR =>
assert(attrLen == 2)
val source = pool.getName(in.nextChar)
if (sourcePath != null) {
val sourceFile0 = sourcePath.lookupPath(source.toString(), false)
if (sourceFile0 != null && clazz.sourceFile == null) {
clazz.sourceFile = sourceFile0
}
staticModule.moduleClass.sourceFile = clazz.sourceFile
}
case nme.AnnotationDefaultATTR =>
sym.attributes =
Triple(definitions.AnnotationDefaultAttr.tpe, List(), List()) :: sym.attributes
in.skip(attrLen)
case nme.RuntimeAnnotationATTR =>
parseAnnotations(attrLen)
if (settings.debug.value)
global.inform("" + sym + "; attributes = " + sym.attributes)
case _ =>
in.skip(attrLen)
}
}
def parseTaggedConstant(): Constant = {
val tag = in.nextByte
val index = in.nextChar
tag match {
case STRING_TAG => Constant(pool.getName(index).toString())
case BOOL_TAG => pool.getConstant(index)
case BYTE_TAG => pool.getConstant(index)
case CHAR_TAG => pool.getConstant(index)
case SHORT_TAG => pool.getConstant(index)
case INT_TAG => pool.getConstant(index)
case LONG_TAG => pool.getConstant(index)
case FLOAT_TAG => pool.getConstant(index)
case DOUBLE_TAG => pool.getConstant(index)
case CLASS_TAG => Constant(pool.getType(index))
case ENUM_TAG =>
val t = pool.getType(index)
val n = pool.getName(in.nextChar)
val s = t.symbol.linkedModule.info.decls.lookup(n)
//assert (s != NoSymbol, "while processing " + in.file + ": " + t + "." + n + ": " + t.decls)
assert(s != NoSymbol, t) // avoid string concatenation!
Constant(s)
case ARRAY_TAG =>
val arr = new ArrayBuffer[Constant]()
for (val i <- 0 until index) {
arr += parseTaggedConstant()
}
new ArrayConstant(arr.toArray,
appliedType(definitions.ArrayClass.typeConstructor, List(arr(0).tpe)))
}
}
def parseAnnotations(len: Int): Unit = {
val nAttr = in.nextChar
for (val n <- 0 until nAttr) {
val attrNameIndex = in.nextChar
val attrType = pool.getType(attrNameIndex)
val nargs = in.nextChar
val nvpairs = new ListBuffer[Pair[Name,Constant]]
for (val i <- 0 until nargs) {
val name = pool.getName(in.nextChar)
nvpairs += Pair(name, parseTaggedConstant())
}
sym.attributes = Triple(attrType, List(), nvpairs.toList) :: sym.attributes
}
}
def parseInnerClasses(): unit = {
for (val i <- 0 until in.nextChar) {
val innerIndex = in.nextChar
val outerIndex = in.nextChar
val nameIndex = in.nextChar
val jflags = in.nextChar
if (innerIndex != 0 && outerIndex != 0 && nameIndex != 0 &&
(jflags & (JAVA_ACC_PUBLIC | JAVA_ACC_PROTECTED)) != 0 &&
pool.getClassSymbol(outerIndex) == sym) {
val innerAlias = getOwner(jflags)
.newAliasType(Position.NOPOS, pool.getName(nameIndex).toTypeName)
.setInfo(pool.getClassSymbol(innerIndex).tpe)
getScope(jflags).enter(innerAlias)
}
}
}
val attrCount = in.nextChar
for (val i <- 0 until attrCount) parseAttribute()
}
def skipAttributes(): unit = {
val attrCount = in.nextChar
for (val i <- 0 until attrCount) {
in.skip(2); in.skip(in.nextInt)
}
}
def skipMembers(): unit = {
val memberCount = in.nextChar
for (val i <- 0 until memberCount) {
in.skip(6); skipAttributes()
}
}
protected def getOwner(flags: int): Symbol =
if ((flags & JAVA_ACC_STATIC) != 0) statics else clazz
protected def getScope(flags: int): Scope =
if ((flags & JAVA_ACC_STATIC) != 0) staticDefs else instanceDefs
protected def transFlags(flags: int): long = {
var res = 0l
if ((flags & JAVA_ACC_PRIVATE) != 0)
res = res | PRIVATE
else if ((flags & JAVA_ACC_PROTECTED) != 0)
res = res | PROTECTED
if ((flags & JAVA_ACC_ABSTRACT) != 0 && (flags & JAVA_ACC_ANNOTATION) == 0)
res = res | DEFERRED
if ((flags & JAVA_ACC_FINAL) != 0)
res = res | FINAL
if (((flags & JAVA_ACC_INTERFACE) != 0) &&
((flags & JAVA_ACC_ANNOTATION) == 0))
res = res | TRAIT | INTERFACE | ABSTRACT
if ((flags & JAVA_ACC_SYNTHETIC) != 0)
res = res | SYNTHETIC
if ((flags & JAVA_ACC_STATIC) != 0)
res = res | STATIC
res | JAVA
}
private def setPrivateWithin(sym: Symbol, jflags: int): unit =
if ((jflags & (JAVA_ACC_PRIVATE | JAVA_ACC_PROTECTED | JAVA_ACC_PUBLIC)) == 0)
sym.privateWithin = sym.toplevelClass.owner
}