Scala example source code file (ScalaSig.scala)
The Scala ScalaSig.scala source code/* ___ ____ ___ __ ___ ___
** / _// __// _ | / / / _ | / _ \ Scala classfile decoder
** __\ \/ /__/ __ |/ /__/ __ |/ ___/ (c) 2003-2011, LAMP/EPFL
** /____/\___/_/ |_/____/_/ |_/_/ http://scala-lang.org/
**
*/
package scala.tools.scalap
package scalax
package rules
package scalasig
import ClassFileParser.{ ConstValueIndex, Annotation }
import scala.reflect.generic.ByteCodecs
object ScalaSigParser {
import Main.{ SCALA_SIG, SCALA_SIG_ANNOTATION, BYTES_VALUE }
def scalaSigFromAnnotation(classFile: ClassFile): Option[ScalaSig] = {
import classFile._
classFile.annotation(SCALA_SIG_ANNOTATION) map {
case Annotation(_, elements) =>
val bytesElem = elements.find(elem => constant(elem.elementNameIndex) == BYTES_VALUE).get
val bytes = ((bytesElem.elementValue match {case ConstValueIndex(index) => constantWrapped(index)})
.asInstanceOf[StringBytesPair].bytes)
val length = ByteCodecs.decode(bytes)
ScalaSigAttributeParsers.parse(ByteCode(bytes.take(length)))
}
}
def scalaSigFromAttribute(classFile: ClassFile) : Option[ScalaSig] =
classFile.attribute(SCALA_SIG).map(_.byteCode).map(ScalaSigAttributeParsers.parse)
def parse(classFile: ClassFile): Option[ScalaSig] = {
val scalaSig = scalaSigFromAttribute(classFile)
scalaSig match {
// No entries in ScalaSig attribute implies that the signature is stored in the annotation
case Some(ScalaSig(_, _, entries)) if entries.length == 0 =>
scalaSigFromAnnotation(classFile)
case x => x
}
}
def parse(clazz : Class[_]): Option[ScalaSig] = {
val byteCode = ByteCode.forClass(clazz)
val classFile = ClassFileParser.parse(byteCode)
parse(classFile)
}
}
object ScalaSigAttributeParsers extends ByteCodeReader {
def parse(byteCode : ByteCode) = expect(scalaSig)(byteCode)
val nat = apply {
def natN(in : ByteCode, x : Int) : Result[ByteCode, Int, Nothing] = in.nextByte match {
case Success(out, b) => {
val y = (x << 7) + (b & 0x7f)
if ((b & 0x80) == 0) Success(out, y) else natN(out, y)
}
case _ => Failure
}
in => natN(in, 0)
}
val rawBytes = nat >> bytes
val entry = nat ~ rawBytes
val symtab = nat >> entry.times
val scalaSig = nat ~ nat ~ symtab ^~~^ ScalaSig
val utf8 = read(x => x.fromUTF8StringAndBytes.string)
val longValue = read(_ toLong)
}
case class ScalaSig(majorVersion : Int, minorVersion : Int, table : Seq[Int ~ ByteCode]) extends DefaultMemoisable {
case class Entry(index : Int, entryType : Int, byteCode : ByteCode) extends DefaultMemoisable {
def scalaSig = ScalaSig.this
def setByteCode(byteCode : ByteCode) = Entry(index, entryType, byteCode)
}
def hasEntry(index : Int) = table isDefinedAt index
def getEntry(index : Int) = {
val entryType ~ byteCode = table(index)
Entry(index, entryType, byteCode)
}
def parseEntry(index : Int) = applyRule(ScalaSigParsers.parseEntry(ScalaSigEntryParsers.entry)(index))
implicit def applyRule[A](parser : ScalaSigParsers.Parser[A]) = ScalaSigParsers.expect(parser)(this)
override def toString = "ScalaSig version " + majorVersion + "." + minorVersion + {
for (i <- 0 until table.size) yield i + ":\t" + parseEntry(i) // + "\n\t" + getEntry(i)
}.mkString("\n", "\n", "")
lazy val symbols : Seq[Symbol] = ScalaSigParsers.symbols
lazy val topLevelClasses : List[ClassSymbol] = ScalaSigParsers.topLevelClasses
lazy val topLevelObjects : List[ObjectSymbol] = ScalaSigParsers.topLevelObjects
}
object ScalaSigParsers extends RulesWithState with MemoisableRules {
type S = ScalaSig
type Parser[A] = Rule[A, String]
val symTab = read(_.table)
val size = symTab ^^ (_.size)
def entry(index : Int) = memo(("entry", index)) {
cond(_ hasEntry index) -~ read(_ getEntry index) >-> { entry => Success(entry, entry.entryType) }
}
def parseEntry[A](parser : ScalaSigEntryParsers.EntryParser[A])(index : Int) : Parser[A] =
entry(index) -~ parser >> { a => entry => Success(entry.scalaSig, a) }
def allEntries[A](f : ScalaSigEntryParsers.EntryParser[A]) = size >> { n => anyOf((0 until n) map parseEntry(f)) }
lazy val entries = allEntries(ScalaSigEntryParsers.entry) as "entries"
lazy val symbols = allEntries(ScalaSigEntryParsers.symbol) as "symbols"
lazy val methods = allEntries(ScalaSigEntryParsers.methodSymbol) as "methods"
lazy val attributes = allEntries(ScalaSigEntryParsers.attributeInfo) as "attributes"
lazy val topLevelClasses = allEntries(ScalaSigEntryParsers.topLevelClass)
lazy val topLevelObjects = allEntries(ScalaSigEntryParsers.topLevelObject)
}
object ScalaSigEntryParsers extends RulesWithState with MemoisableRules {
import ScalaSigAttributeParsers.{nat, utf8, longValue}
type S = ScalaSig#Entry
type EntryParser[A] = Rule[A, String]
implicit def byteCodeEntryParser[A](rule : ScalaSigAttributeParsers.Parser[A]) : EntryParser[A] = apply { entry =>
rule(entry.byteCode) mapOut (entry setByteCode _)
}
def toEntry[A](index : Int) = apply { sigEntry => ScalaSigParsers.entry(index)(sigEntry.scalaSig) }
def parseEntry[A](parser : EntryParser[A])(index : Int) = (toEntry(index) -~ parser)
implicit def entryType(code : Int) = key filter (_ == code)
val index = read(_.index)
val key = read(_.entryType)
lazy val entry : EntryParser[Any] = symbol | typeEntry | literal | name | attributeInfo | annotInfo | children | get
val ref = byteCodeEntryParser(nat)
val termName = 1 -~ utf8
val typeName = 2 -~ utf8
val name = termName | typeName as "name"
def refTo[A](rule : EntryParser[A]) : EntryParser[A] = ref >>& parseEntry(rule)
lazy val nameRef = refTo(name)
lazy val symbolRef = refTo(symbol)
lazy val typeRef = refTo(typeEntry)
lazy val constantRef = refTo(literal)
val symbolInfo = nameRef ~ symbolRef ~ nat ~ (symbolRef?) ~ ref ~ get ^~~~~~^ SymbolInfo
def symHeader(key: Int) = (key -~ none | (key + 64) -~ nat)
def symbolEntry(key : Int) = symHeader(key) -~ symbolInfo
/***************************************************
* Symbol table attribute format:
* Symtab = nentries_Nat {Entry}
* Entry = 1 TERMNAME len_Nat NameInfo
* | 2 TYPENAME len_Nat NameInfo
* | 3 NONEsym len_Nat
* | 4 TYPEsym len_Nat SymbolInfo
* | 5 ALIASsym len_Nat SymbolInfo
* | 6 CLASSsym len_Nat SymbolInfo [thistype_Ref]
* | 7 MODULEsym len_Nat SymbolInfo
* | 8 VALsym len_Nat [defaultGetter_Ref /* no longer needed*/] SymbolInfo [alias_Ref]
* | 9 EXTref len_Nat name_Ref [owner_Ref]
* | 10 EXTMODCLASSref len_Nat name_Ref [owner_Ref]
* | 11 NOtpe len_Nat
* | 12 NOPREFIXtpe len_Nat
* | 13 THIStpe len_Nat sym_Ref
* | 14 SINGLEtpe len_Nat type_Ref sym_Ref
* | 15 CONSTANTtpe len_Nat constant_Ref
* | 16 TYPEREFtpe len_Nat type_Ref sym_Ref {targ_Ref}
* | 17 TYPEBOUNDStpe len_Nat tpe_Ref tpe_Ref
* | 18 REFINEDtpe len_Nat classsym_Ref {tpe_Ref}
* | 19 CLASSINFOtpe len_Nat classsym_Ref {tpe_Ref}
* | 20 METHODtpe len_Nat tpe_Ref {sym_Ref}
* | 21 POLYTtpe len_Nat tpe_Ref {sym_Ref}
* | 22 IMPLICITMETHODtpe len_Nat tpe_Ref {sym_Ref} /* no longer needed */
* | 52 SUPERtpe len_Nat tpe_Ref tpe_Ref
* | 24 LITERALunit len_Nat
* | 25 LITERALboolean len_Nat value_Long
* | 26 LITERALbyte len_Nat value_Long
* | 27 LITERALshort len_Nat value_Long
* | 28 LITERALchar len_Nat value_Long
* | 29 LITERALint len_Nat value_Long
* | 30 LITERALlong len_Nat value_Long
* | 31 LITERALfloat len_Nat value_Long
* | 32 LITERALdouble len_Nat value_Long
* | 33 LITERALstring len_Nat name_Ref
* | 34 LITERALnull len_Nat
* | 35 LITERALclass len_Nat tpe_Ref
* | 36 LITERALenum len_Nat sym_Ref
* | 40 SYMANNOT len_Nat sym_Ref AnnotInfoBody
* | 41 CHILDREN len_Nat sym_Ref {sym_Ref}
* | 42 ANNOTATEDtpe len_Nat [sym_Ref /* no longer needed */] tpe_Ref {annotinfo_Ref}
* | 43 ANNOTINFO len_Nat AnnotInfoBody
* | 44 ANNOTARGARRAY len_Nat {constAnnotArg_Ref}
* | 47 DEBRUIJNINDEXtpe len_Nat level_Nat index_Nat
* | 48 EXISTENTIALtpe len_Nat type_Ref {symbol_Ref}
*/
val noSymbol = 3 -^ NoSymbol
val typeSymbol = symbolEntry(4) ^^ TypeSymbol as "typeSymbol"
val aliasSymbol = symbolEntry(5) ^^ AliasSymbol as "alias"
val classSymbol = symbolEntry(6) ~ (ref?) ^~^ ClassSymbol as "class"
val objectSymbol = symbolEntry(7) ^^ ObjectSymbol as "object"
val methodSymbol = symHeader(8) -~ /*(ref?) -~*/ symbolInfo ~ (ref?) ^~^ MethodSymbol as "method"
val extRef = 9 -~ nameRef ~ (symbolRef?) ~ get ^~~^ ExternalSymbol as "extRef"
val extModClassRef = 10 -~ nameRef ~ (symbolRef?) ~ get ^~~^ ExternalSymbol as "extModClassRef"
lazy val symbol : EntryParser[Symbol] = oneOf(
noSymbol,
typeSymbol,
aliasSymbol,
classSymbol,
objectSymbol,
methodSymbol,
extRef,
extModClassRef) as "symbol"
val classSymRef = refTo(classSymbol)
val attribTreeRef = ref
val typeLevel = nat
val typeIndex = nat
lazy val typeEntry : EntryParser[Type] = oneOf(
11 -^ NoType,
12 -^ NoPrefixType,
13 -~ symbolRef ^^ ThisType,
14 -~ typeRef ~ symbolRef ^~^ SingleType,
15 -~ constantRef ^^ ConstantType,
16 -~ typeRef ~ symbolRef ~ (typeRef*) ^~~^ TypeRefType,
17 -~ typeRef ~ typeRef ^~^ TypeBoundsType,
18 -~ classSymRef ~ (typeRef*) ^~^ RefinedType,
19 -~ symbolRef ~ (typeRef*) ^~^ ClassInfoType,
20 -~ typeRef ~ (symbolRef*) ^~^ MethodType,
21 -~ typeRef ~ (refTo(typeSymbol)+) ^~^ PolyType,
// TODO: make future safe for past by doing the same transformation as in the
// full unpickler in case we're reading pre-2.9 classfiles
21 -~ typeRef ^^ NullaryMethodType,
22 -~ typeRef ~ (symbolRef*) ^~^ MethodType,
42 -~ typeRef ~ (attribTreeRef*) ^~^ AnnotatedType,
51 -~ typeRef ~ symbolRef ~ (attribTreeRef*) ^~~^ AnnotatedWithSelfType,
47 -~ typeLevel ~ typeIndex ^~^ DeBruijnIndexType,
48 -~ typeRef ~ (symbolRef*) ^~^ ExistentialType) as "type"
lazy val literal = oneOf(
24 -^ (),
25 -~ longValue ^^ (_ != 0L),
26 -~ longValue ^^ (_.toByte),
27 -~ longValue ^^ (_.toShort),
28 -~ longValue ^^ (_.toChar),
29 -~ longValue ^^ (_.toInt),
30 -~ longValue ^^ (_.toLong),
31 -~ longValue ^^ (l => java.lang.Float.intBitsToFloat(l.toInt)),
32 -~ longValue ^^ (java.lang.Double.longBitsToDouble),
33 -~ nameRef,
34 -^ null,
35 -~ typeRef)
lazy val attributeInfo = 40 -~ symbolRef ~ typeRef ~ (constantRef?) ~ (nameRef ~ constantRef *) ^~~~^ AttributeInfo // sym_Ref info_Ref {constant_Ref} {nameRef constantRef}
lazy val children = 41 -~ (nat*) ^^ Children //sym_Ref {sym_Ref}
lazy val annotInfo = 43 -~ (nat*) ^^ AnnotInfo // attarg_Ref {constant_Ref attarg_Ref}
lazy val topLevelClass = classSymbol filter isTopLevelClass
lazy val topLevelObject = objectSymbol filter isTopLevel
def isTopLevel(symbol : Symbol) = symbol.parent match {
case Some(ext : ExternalSymbol) => true
case _ => false
}
def isTopLevelClass (symbol : Symbol) = !symbol.isModule && isTopLevel(symbol)
}
case class AttributeInfo(symbol : Symbol, typeRef : Type, value : Option[Any], values : Seq[String ~ Any]) // sym_Ref info_Ref {constant_Ref} {nameRef constantRef}
case class Children(symbolRefs : Seq[Int]) //sym_Ref {sym_Ref}
case class AnnotInfo(refs : Seq[Int]) // attarg_Ref {constant_Ref attarg_Ref}
/***************************************************
* | 49 TREE len_Nat 1 EMPTYtree
* | 49 TREE len_Nat 2 PACKAGEtree type_Ref sym_Ref mods_Ref name_Ref {tree_Ref}
* | 49 TREE len_Nat 3 CLASStree type_Ref sym_Ref mods_Ref name_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 4 MODULEtree type_Ref sym_Ref mods_Ref name_Ref tree_Ref
* | 49 TREE len_Nat 5 VALDEFtree type_Ref sym_Ref mods_Ref name_Ref tree_Ref tree_Ref
* | 49 TREE len_Nat 6 DEFDEFtree type_Ref sym_Ref mods_Ref name_Ref numtparams_Nat {tree_Ref} numparamss_Nat {numparams_Nat {tree_Ref}} tree_Ref tree_Ref
* | 49 TREE len_Nat 7 TYPEDEFtree type_Ref sym_Ref mods_Ref name_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 8 LABELtree type_Ref sym_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 9 IMPORTtree type_Ref sym_Ref tree_Ref {name_Ref name_Ref}
* | 49 TREE len_Nat 11 DOCDEFtree type_Ref sym_Ref string_Ref tree_Ref
* | 49 TREE len_Nat 12 TEMPLATEtree type_Ref sym_Ref numparents_Nat {tree_Ref} tree_Ref {tree_Ref}
* | 49 TREE len_Nat 13 BLOCKtree type_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 14 CASEtree type_Ref tree_Ref tree_Ref tree_Ref
* | 49 TREE len_Nat 15 SEQUENCEtree type_Ref {tree_Ref}
* | 49 TREE len_Nat 16 ALTERNATIVEtree type_Ref {tree_Ref}
* | 49 TREE len_Nat 17 STARtree type_Ref {tree_Ref}
* | 49 TREE len_Nat 18 BINDtree type_Ref sym_Ref name_Ref tree_Ref
* | 49 TREE len_Nat 19 UNAPPLYtree type_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 20 ARRAYVALUEtree type_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 21 FUNCTIONtree type_Ref sym_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 22 ASSIGNtree type_Ref tree_Ref tree_Ref
* | 49 TREE len_Nat 23 IFtree type_Ref tree_Ref tree_Ref tree_Ref
* | 49 TREE len_Nat 24 MATCHtree type_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 25 RETURNtree type_Ref sym_Ref tree_Ref
* | 49 TREE len_Nat 26 TREtree type_Ref tree_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 27 THROWtree type_Ref tree_Ref
* | 49 TREE len_Nat 28 NEWtree type_Ref tree_Ref
* | 49 TREE len_Nat 29 TYPEDtree type_Ref tree_Ref tree_Ref
* | 49 TREE len_Nat 30 TYPEAPPLYtree type_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 31 APPLYtree type_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 32 APPLYDYNAMICtree type_Ref sym_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 33 SUPERtree type_Ref sym_Ref tree_Ref name_Ref
* | 49 TREE len_Nat 34 THIStree type_Ref sym_Ref name_Ref
* | 49 TREE len_Nat 35 SELECTtree type_Ref sym_Ref tree_Ref name_Ref
* | 49 TREE len_Nat 36 IDENTtree type_Ref sym_Ref name_Ref
* | 49 TREE len_Nat 37 LITERALtree type_Ref constant_Ref
* | 49 TREE len_Nat 38 TYPEtree type_Ref
* | 49 TREE len_Nat 39 ANNOTATEDtree type_Ref tree_Ref tree_Ref
* | 49 TREE len_Nat 40 SINGLETONTYPEtree type_Ref tree_Ref
* | 49 TREE len_Nat 41 SELECTFROMTYPEtree type_Ref tree_Ref name_Ref
* | 49 TREE len_Nat 42 COMPOUNDTYPEtree type_Ref tree_Ref
* | 49 TREE len_Nat 43 APPLIEDTYPEtree type_Ref tree_Ref {tree_Ref}
* | 49 TREE len_Nat 44 TYPEBOUNDStree type_Ref tree_Ref tree_Ref
* | 49 TREE len_Nat 45 EXISTENTIALTYPEtree type_Ref tree_Ref {tree_Ref}
* | 50 MODIFIERS len_Nat flags_Long privateWithin_Ref
* SymbolInfo = name_Ref owner_Ref flags_LongNat [privateWithin_Ref] info_Ref
* NameInfo = <character sequence of length len_Nat in Utf8 format>
* NumInfo = <len_Nat-byte signed number in big endian format>
* Ref = Nat
* AnnotInfoBody = info_Ref {annotArg_Ref} {name_Ref constAnnotArg_Ref}
* AnnotArg = Tree | Constant
* ConstAnnotArg = Constant | AnnotInfo | AnnotArgArray
*
* len is remaining length after `len'.
*/
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