|
|
Scala example source code file (UnPickler.scala)
This example Scala source code file (UnPickler.scala) is included in the DevDaily.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.
The Scala UnPickler.scala source code
/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Martin Odersky
*/
package scala.reflect
package generic
import java.io.IOException
import java.lang.Float.intBitsToFloat
import java.lang.Double.longBitsToDouble
import Flags._
import PickleFormat._
import collection.mutable.{HashMap, ListBuffer}
import annotation.switch
/** @author Martin Odersky
* @version 1.0
*/
@deprecated("scala.reflect.generic will be removed", "2.9.1")
abstract class UnPickler {
val global: Universe
import global._
/** Unpickle symbol table information descending from a class and/or module root
* from an array of bytes.
* @param bytes bytearray from which we unpickle
* @param offset offset from which unpickling starts
* @param classroot the top-level class which is unpickled, or NoSymbol if inapplicable
* @param moduleroot the top-level module which is unpickled, or NoSymbol if inapplicable
* @param filename filename associated with bytearray, only used for error messages
*/
def unpickle(bytes: Array[Byte], offset: Int, classRoot: Symbol, moduleRoot: Symbol, filename: String) {
try {
scan(bytes, offset, classRoot, moduleRoot, filename)
} catch {
case ex: IOException =>
throw ex
case ex: Throwable =>
/*if (settings.debug.value)*/ ex.printStackTrace()
throw new RuntimeException("error reading Scala signature of "+filename+": "+ex.getMessage())
}
}
/** To be implemented in subclasses. Like `unpickle` but without the catch-all error handling.
*/
def scan(bytes: Array[Byte], offset: Int, classRoot: Symbol, moduleRoot: Symbol, filename: String)
abstract class Scan(bytes: Array[Byte], offset: Int, classRoot: Symbol, moduleRoot: Symbol, filename: String) extends PickleBuffer(bytes, offset, -1) {
//println("unpickle " + classRoot + " and " + moduleRoot)//debug
protected def debug = false
checkVersion()
/** A map from entry numbers to array offsets */
private val index = createIndex
/** A map from entry numbers to symbols, types, or annotations */
private val entries = new Array[AnyRef](index.length)
/** A map from symbols to their associated `decls' scopes */
private val symScopes = new HashMap[Symbol, Scope]
//println("unpickled " + classRoot + ":" + classRoot.rawInfo + ", " + moduleRoot + ":" + moduleRoot.rawInfo);//debug
// Unused: left in 2.9.1 to satisfy mima.
private def run$unused() {
// read children last, fix for #3951
val queue = new collection.mutable.ListBuffer[() => Unit]()
def delay(i: Int, action: => Unit) {
queue += (() => at(i, {() => action; null}))
}
for (i <- 0 until index.length) {
if (isSymbolEntry(i))
at(i, readSymbol)
else if (isSymbolAnnotationEntry(i))
delay(i, readSymbolAnnotation())
else if (isChildrenEntry(i))
delay(i, readChildren())
}
for (action <- queue)
action()
}
// Laboriously unrolled for performance.
def run() {
var i = 0
while (i < index.length) {
if (entries(i) == null && isSymbolEntry(i)) {
val savedIndex = readIndex
readIndex = index(i)
entries(i) = readSymbol()
readIndex = savedIndex
}
i += 1
}
// read children last, fix for #3951
i = 0
while (i < index.length) {
if (entries(i) == null) {
if (isSymbolAnnotationEntry(i)) {
val savedIndex = readIndex
readIndex = index(i)
readSymbolAnnotation()
readIndex = savedIndex
}
else if (isChildrenEntry(i)) {
val savedIndex = readIndex
readIndex = index(i)
readChildren()
readIndex = savedIndex
}
}
i += 1
}
}
private def checkVersion() {
val major = readNat()
val minor = readNat()
if (major != MajorVersion || minor > MinorVersion)
throw new IOException("Scala signature " + classRoot.decodedName +
" has wrong version\n expected: " +
MajorVersion + "." + MinorVersion +
"\n found: " + major + "." + minor +
" in "+filename)
}
/** The `decls' scope associated with given symbol */
protected def symScope(sym: Symbol) = symScopes.getOrElseUpdate(sym, newScope)
/** Does entry represent an (internal) symbol */
protected def isSymbolEntry(i: Int): Boolean = {
val tag = bytes(index(i)).toInt
(firstSymTag <= tag && tag <= lastSymTag &&
(tag != CLASSsym || !isRefinementSymbolEntry(i)))
}
/** Does entry represent an (internal or external) symbol */
protected def isSymbolRef(i: Int): Boolean = {
val tag = bytes(index(i))
(firstSymTag <= tag && tag <= lastExtSymTag)
}
/** Does entry represent a name? */
protected def isNameEntry(i: Int): Boolean = {
val tag = bytes(index(i)).toInt
tag == TERMname || tag == TYPEname
}
/** Does entry represent a symbol annotation? */
protected def isSymbolAnnotationEntry(i: Int): Boolean = {
val tag = bytes(index(i)).toInt
tag == SYMANNOT
}
/** Does the entry represent children of a symbol? */
protected def isChildrenEntry(i: Int): Boolean = {
val tag = bytes(index(i)).toInt
tag == CHILDREN
}
/** Does entry represent a refinement symbol?
* pre: Entry is a class symbol
*/
protected def isRefinementSymbolEntry(i: Int): Boolean = {
val savedIndex = readIndex
readIndex = index(i)
val tag = readByte().toInt
assert(tag == CLASSsym)
readNat(); // read length
val result = readNameRef() == tpnme.REFINE_CLASS_NAME
readIndex = savedIndex
result
}
/** If entry at <code>i is undefined, define it by performing
* operation <code>op with readIndex at start of i'th
* entry. Restore <code>readIndex afterwards.
*/
protected def at[T <: AnyRef](i: Int, op: () => T): T = {
var r = entries(i)
if (r eq null) {
val savedIndex = readIndex
readIndex = index(i)
r = op()
assert(entries(i) eq null, entries(i))
entries(i) = r
readIndex = savedIndex
}
r.asInstanceOf[T]
}
/** Read a name */
protected def readName(): Name = {
val tag = readByte()
val len = readNat()
tag match {
case TERMname => newTermName(bytes, readIndex, len)
case TYPEname => newTypeName(bytes, readIndex, len)
case _ => errorBadSignature("bad name tag: " + tag)
}
}
/** Read a symbol */
protected def readSymbol(): Symbol = {
val tag = readByte()
val end = readNat() + readIndex
def atEnd = readIndex == end
def readExtSymbol(): Symbol = {
val name = readNameRef()
val owner = if (atEnd) definitions.RootClass else readSymbolRef()
def fromName(name: Name) = mkTermName(name) match {
case nme.ROOT => definitions.RootClass
case nme.ROOTPKG => definitions.RootPackage
case _ =>
val s = owner.info.decl(name)
if (tag == EXTref) s else s.moduleClass
}
def nestedObjectSymbol: Symbol = {
// If the owner is overloaded (i.e. a method), it's not possible to select the
// right member, so return NoSymbol. This can only happen when unpickling a tree.
// the "case Apply" in readTree() takes care of selecting the correct alternative
// after parsing the arguments.
if (owner.isOverloaded)
return NoSymbol
if (tag == EXTMODCLASSref) {
val moduleVar = owner.info.decl(nme.moduleVarName(name))
if (moduleVar.isLazyAccessor)
return moduleVar.lazyAccessor.lazyAccessor
}
NoSymbol
}
// (1) Try name.
fromName(name) orElse {
// (2) Try with expanded name. Can happen if references to private
// symbols are read from outside: for instance when checking the children
// of a class. See #1722.
fromName(nme.expandedName(name, owner)) orElse {
// (3) Try as a nested object symbol.
nestedObjectSymbol orElse {
// (4) Otherwise, fail.
errorMissingRequirement(name, owner)
}
}
}
}
tag match {
case NONEsym => return NoSymbol
case EXTref | EXTMODCLASSref => return readExtSymbol()
case _ => ()
}
// symbols that were pickled with Pickler.writeSymInfo
val nameref = readNat()
val name = at(nameref, readName)
val owner = readSymbolRef()
val flags = pickledToRawFlags(readLongNat())
var inforef = readNat()
val privateWithin =
if (!isSymbolRef(inforef)) NoSymbol
else {
val pw = at(inforef, readSymbol)
inforef = readNat()
pw
}
def isModuleFlag = (flags & MODULE) != 0L
def isMethodFlag = (flags & METHOD) != 0L
def isClassRoot = (name == classRoot.name) && (owner == classRoot.owner)
def isModuleRoot = (name == moduleRoot.name) && (owner == moduleRoot.owner)
def finishSym(sym: Symbol): Symbol = {
sym.flags = flags & PickledFlags
sym.privateWithin = privateWithin
sym.info = (
if (atEnd) {
assert(!sym.isSuperAccessor, sym)
newLazyTypeRef(inforef)
}
else {
assert(sym.isSuperAccessor || sym.isParamAccessor, sym)
newLazyTypeRefAndAlias(inforef, readNat())
}
)
if (sym.owner.isClass && sym != classRoot && sym != moduleRoot &&
!sym.isModuleClass && !sym.isRefinementClass && !sym.isTypeParameter && !sym.isExistentiallyBound)
symScope(sym.owner) enter sym
sym
}
finishSym(tag match {
case TYPEsym => owner.newAbstractType(mkTypeName(name))
case ALIASsym => owner.newAliasType(mkTypeName(name))
case CLASSsym =>
val sym = (isClassRoot, isModuleFlag) match {
case (true, true) => moduleRoot.moduleClass
case (true, false) => classRoot
case (false, true) => owner.newModuleClass(mkTypeName(name))
case (false, false) => owner.newClass(mkTypeName(name))
}
if (!atEnd)
sym.typeOfThis = newLazyTypeRef(readNat())
sym
case MODULEsym =>
val clazz = at(inforef, () => readType()).typeSymbol // after the NMT_TRANSITION period, we can leave off the () => ... ()
if (isModuleRoot) moduleRoot
else {
val m = owner.newModule(name, clazz)
clazz.sourceModule = m
m
}
case VALsym =>
if (isModuleRoot) { assert(false); NoSymbol }
else if (isMethodFlag) owner.newMethod(name)
else owner.newValue(name)
case _ =>
errorBadSignature("bad symbol tag: " + tag)
})
}
/** Read a type
*
* @param forceProperType is used to ease the transition to NullaryMethodTypes (commentmarker: NMT_TRANSITION)
* the flag say that a type of kind * is expected, so that PolyType(tps, restpe) can be disambiguated to PolyType(tps, NullaryMethodType(restpe))
* (if restpe is not a ClassInfoType, a MethodType or a NullaryMethodType, which leaves TypeRef/SingletonType -- the latter would make the polytype a type constructor)
*/
protected def readType(forceProperType: Boolean = false): Type = {
val tag = readByte()
val end = readNat() + readIndex
(tag: @switch) match {
case NOtpe =>
NoType
case NOPREFIXtpe =>
NoPrefix
case THIStpe =>
ThisType(readSymbolRef())
case SINGLEtpe =>
SingleType(readTypeRef(), readSymbolRef()) // !!! was singleType
case SUPERtpe =>
val thistpe = readTypeRef()
val supertpe = readTypeRef()
SuperType(thistpe, supertpe)
case CONSTANTtpe =>
ConstantType(readConstantRef())
case TYPEREFtpe =>
val pre = readTypeRef()
val sym = readSymbolRef()
var args = until(end, readTypeRef)
TypeRef(pre, sym, args)
case TYPEBOUNDStpe =>
TypeBounds(readTypeRef(), readTypeRef())
case REFINEDtpe =>
val clazz = readSymbolRef()
RefinedType(until(end, readTypeRef), symScope(clazz), clazz)
case CLASSINFOtpe =>
val clazz = readSymbolRef()
ClassInfoType(until(end, readTypeRef), symScope(clazz), clazz)
case METHODtpe | IMPLICITMETHODtpe =>
val restpe = readTypeRef()
val params = until(end, readSymbolRef)
// if the method is overloaded, the params cannot be determined (see readSymbol) => return NoType.
// Only happen for trees, "case Apply" in readTree() takes care of selecting the correct
// alternative after parsing the arguments.
if (params.contains(NoSymbol) || restpe == NoType) NoType
else MethodType(params, restpe)
case POLYtpe =>
val restpe = readTypeRef()
val typeParams = until(end, readSymbolRef)
if(typeParams nonEmpty) {
// NMT_TRANSITION: old class files denoted a polymorphic nullary method as PolyType(tps, restpe), we now require PolyType(tps, NullaryMethodType(restpe))
// when a type of kind * is expected (forceProperType is true), we know restpe should be wrapped in a NullaryMethodType (if it wasn't suitably wrapped yet)
def transitionNMT(restpe: Type) = {
val resTpeCls = restpe.getClass.toString // what's uglier than isInstanceOf? right! -- isInstanceOf does not work since the concrete types are defined in the compiler (not in scope here)
if(forceProperType /*&& pickleformat < 2.9 */ && !(resTpeCls.endsWith("MethodType"))) { assert(!resTpeCls.contains("ClassInfoType"))
NullaryMethodType(restpe) }
else restpe
}
PolyType(typeParams, transitionNMT(restpe))
}
else
NullaryMethodType(restpe)
case EXISTENTIALtpe =>
val restpe = readTypeRef()
val tparams = until(end, readSymbolRef)
// binary compatibility: in 2.9.x, Symbol doesn't have setFlag
tparams foreach (x => x.asInstanceOf[{ def setFlag(mask: Long): this.type }] setFlag EXISTENTIAL)
ExistentialType(tparams, restpe)
case ANNOTATEDtpe =>
var typeRef = readNat()
val selfsym = if (isSymbolRef(typeRef)) {
val s = at(typeRef, readSymbol)
typeRef = readNat()
s
} else NoSymbol // selfsym can go.
val tp = at(typeRef, () => readType(forceProperType)) // NMT_TRANSITION
val annots = until(end, readAnnotationRef)
if (selfsym == NoSymbol) AnnotatedType(annots, tp, selfsym)
else tp
case _ =>
noSuchTypeTag(tag, end)
}
}
def noSuchTypeTag(tag: Int, end: Int): Type =
errorBadSignature("bad type tag: " + tag)
/** Read a constant */
protected def readConstant(): Constant = {
val tag = readByte().toInt
val len = readNat()
(tag: @switch) match {
case LITERALunit => Constant(())
case LITERALboolean => Constant(readLong(len) != 0L)
case LITERALbyte => Constant(readLong(len).toByte)
case LITERALshort => Constant(readLong(len).toShort)
case LITERALchar => Constant(readLong(len).toChar)
case LITERALint => Constant(readLong(len).toInt)
case LITERALlong => Constant(readLong(len))
case LITERALfloat => Constant(intBitsToFloat(readLong(len).toInt))
case LITERALdouble => Constant(longBitsToDouble(readLong(len)))
case LITERALstring => Constant(readNameRef().toString())
case LITERALnull => Constant(null)
case LITERALclass => Constant(readTypeRef())
case LITERALenum => Constant(readSymbolRef())
case _ => noSuchConstantTag(tag, len)
}
}
def noSuchConstantTag(tag: Int, len: Int): Constant =
errorBadSignature("bad constant tag: " + tag)
/** Read children and store them into the corresponding symbol.
*/
protected def readChildren() {
val tag = readByte()
assert(tag == CHILDREN)
val end = readNat() + readIndex
val target = readSymbolRef()
while (readIndex != end) target addChild readSymbolRef()
}
/** Read an annotation argument, which is pickled either
* as a Constant or a Tree.
*/
protected def readAnnotArg(i: Int): Tree = bytes(index(i)) match {
case TREE => at(i, readTree)
case _ =>
val const = at(i, readConstant)
Literal(const) setType const.tpe
}
/** Read a ClassfileAnnotArg (argument to a classfile annotation)
*/
private def readArrayAnnot() = {
readByte() // skip the `annotargarray` tag
val end = readNat() + readIndex
until(end, () => readClassfileAnnotArg(readNat())).toArray(classfileAnnotArgManifest)
}
protected def readClassfileAnnotArg(i: Int): ClassfileAnnotArg = bytes(index(i)) match {
case ANNOTINFO => NestedAnnotArg(at(i, readAnnotation))
case ANNOTARGARRAY => at(i, () => ArrayAnnotArg(readArrayAnnot()))
case _ => LiteralAnnotArg(at(i, readConstant))
}
/** Read an AnnotationInfo. Not to be called directly, use
* readAnnotation or readSymbolAnnotation
*/
protected def readAnnotationInfo(end: Int): AnnotationInfo = {
val atp = readTypeRef()
val args = new ListBuffer[Tree]
val assocs = new ListBuffer[(Name, ClassfileAnnotArg)]
while (readIndex != end) {
val argref = readNat()
if (isNameEntry(argref)) {
val name = at(argref, readName)
val arg = readClassfileAnnotArg(readNat())
assocs += ((name, arg))
}
else
args += readAnnotArg(argref)
}
AnnotationInfo(atp, args.toList, assocs.toList)
}
/** Read an annotation and as a side effect store it into
* the symbol it requests. Called at top-level, for all
* (symbol, annotInfo) entries. */
protected def readSymbolAnnotation() {
val tag = readByte()
if (tag != SYMANNOT)
errorBadSignature("symbol annotation expected ("+ tag +")")
val end = readNat() + readIndex
val target = readSymbolRef()
target.addAnnotation(readAnnotationInfo(end))
}
/** Read an annotation and return it. Used when unpickling
* an ANNOTATED(WSELF)tpe or a NestedAnnotArg */
protected def readAnnotation(): AnnotationInfo = {
val tag = readByte()
if (tag != ANNOTINFO)
errorBadSignature("annotation expected (" + tag + ")")
val end = readNat() + readIndex
readAnnotationInfo(end)
}
/* Read an abstract syntax tree */
protected def readTree(): Tree = {
val outerTag = readByte()
if (outerTag != TREE)
errorBadSignature("tree expected (" + outerTag + ")")
val end = readNat() + readIndex
val tag = readByte()
val tpe = if (tag == EMPTYtree) NoType else readTypeRef()
// Set by the three functions to follow. If symbol is non-null
// after the the new tree 't' has been created, t has its Symbol
// set to symbol; and it always has its Type set to tpe.
var symbol: Symbol = null
var mods: Modifiers = null
var name: Name = null
/** Read a Symbol, Modifiers, and a Name */
def setSymModsName() {
symbol = readSymbolRef()
mods = readModifiersRef()
name = readNameRef()
}
/** Read a Symbol and a Name */
def setSymName() {
symbol = readSymbolRef()
name = readNameRef()
}
/** Read a Symbol */
def setSym() {
symbol = readSymbolRef()
}
val t = tag match {
case EMPTYtree =>
EmptyTree
case PACKAGEtree =>
setSym()
val pid = readTreeRef().asInstanceOf[RefTree]
val stats = until(end, readTreeRef)
PackageDef(pid, stats)
case CLASStree =>
setSymModsName()
val impl = readTemplateRef()
val tparams = until(end, readTypeDefRef)
ClassDef(mods, mkTypeName(name), tparams, impl)
case MODULEtree =>
setSymModsName()
ModuleDef(mods, name, readTemplateRef())
case VALDEFtree =>
setSymModsName()
val tpt = readTreeRef()
val rhs = readTreeRef()
ValDef(mods, name, tpt, rhs)
case DEFDEFtree =>
setSymModsName()
val tparams = times(readNat(), readTypeDefRef)
val vparamss = times(readNat(), () => times(readNat(), readValDefRef))
val tpt = readTreeRef()
val rhs = readTreeRef()
DefDef(mods, name, tparams, vparamss, tpt, rhs)
case TYPEDEFtree =>
setSymModsName()
val rhs = readTreeRef()
val tparams = until(end, readTypeDefRef)
TypeDef(mods, mkTypeName(name), tparams, rhs)
case LABELtree =>
setSymName()
val rhs = readTreeRef()
val params = until(end, readIdentRef)
LabelDef(name, params, rhs)
case IMPORTtree =>
setSym()
val expr = readTreeRef()
val selectors = until(end, () => {
val from = readNameRef()
val to = readNameRef()
ImportSelector(from, -1, to, -1)
})
Import(expr, selectors)
case TEMPLATEtree =>
setSym()
val parents = times(readNat(), readTreeRef)
val self = readValDefRef()
val body = until(end, readTreeRef)
Template(parents, self, body)
case BLOCKtree =>
val expr = readTreeRef()
val stats = until(end, readTreeRef)
Block(stats, expr)
case CASEtree =>
val pat = readTreeRef()
val guard = readTreeRef()
val body = readTreeRef()
CaseDef(pat, guard, body)
case ALTERNATIVEtree =>
Alternative(until(end, readTreeRef))
case STARtree =>
Star(readTreeRef())
case BINDtree =>
setSymName()
Bind(name, readTreeRef())
case UNAPPLYtree =>
val fun = readTreeRef()
val args = until(end, readTreeRef)
UnApply(fun, args)
case ARRAYVALUEtree =>
val elemtpt = readTreeRef()
val trees = until(end, readTreeRef)
ArrayValue(elemtpt, trees)
case FUNCTIONtree =>
setSym()
val body = readTreeRef()
val vparams = until(end, readValDefRef)
Function(vparams, body)
case ASSIGNtree =>
val lhs = readTreeRef()
val rhs = readTreeRef()
Assign(lhs, rhs)
case IFtree =>
val cond = readTreeRef()
val thenp = readTreeRef()
val elsep = readTreeRef()
If(cond, thenp, elsep)
case MATCHtree =>
val selector = readTreeRef()
val cases = until(end, readCaseDefRef)
Match(selector, cases)
case RETURNtree =>
setSym()
Return(readTreeRef())
case TREtree =>
val block = readTreeRef()
val finalizer = readTreeRef()
val catches = until(end, readCaseDefRef)
Try(block, catches, finalizer)
case THROWtree =>
Throw(readTreeRef())
case NEWtree =>
New(readTreeRef())
case TYPEDtree =>
val expr = readTreeRef()
val tpt = readTreeRef()
Typed(expr, tpt)
case TYPEAPPLYtree =>
val fun = readTreeRef()
val args = until(end, readTreeRef)
TypeApply(fun, args)
case APPLYtree =>
val fun = readTreeRef()
val args = until(end, readTreeRef)
if (fun.symbol.isOverloaded) {
fun.setType(fun.symbol.info)
inferMethodAlternative(fun, args map (_.tpe), tpe)
}
Apply(fun, args)
case APPLYDYNAMICtree =>
setSym()
val qual = readTreeRef()
val args = until(end, readTreeRef)
ApplyDynamic(qual, args)
case SUPERtree =>
setSym()
val qual = readTreeRef()
val mix = readTypeNameRef()
Super(qual, mix)
case THIStree =>
setSym()
This(readTypeNameRef())
case SELECTtree =>
setSym()
val qualifier = readTreeRef()
val selector = readNameRef()
Select(qualifier, selector)
case IDENTtree =>
setSymName()
Ident(name)
case LITERALtree =>
Literal(readConstantRef())
case TYPEtree =>
TypeTree()
case ANNOTATEDtree =>
val annot = readTreeRef()
val arg = readTreeRef()
Annotated(annot, arg)
case SINGLETONTYPEtree =>
SingletonTypeTree(readTreeRef())
case SELECTFROMTYPEtree =>
val qualifier = readTreeRef()
val selector = readTypeNameRef()
SelectFromTypeTree(qualifier, selector)
case COMPOUNDTYPEtree =>
CompoundTypeTree(readTemplateRef())
case APPLIEDTYPEtree =>
val tpt = readTreeRef()
val args = until(end, readTreeRef)
AppliedTypeTree(tpt, args)
case TYPEBOUNDStree =>
val lo = readTreeRef()
val hi = readTreeRef()
TypeBoundsTree(lo, hi)
case EXISTENTIALTYPEtree =>
val tpt = readTreeRef()
val whereClauses = until(end, readTreeRef)
ExistentialTypeTree(tpt, whereClauses)
case _ =>
noSuchTreeTag(tag, end)
}
if (symbol == null) t setType tpe
else t setSymbol symbol setType tpe
}
def noSuchTreeTag(tag: Int, end: Int) =
errorBadSignature("unknown tree type (" + tag + ")")
def readModifiers(): Modifiers = {
val tag = readNat()
if (tag != MODIFIERS)
errorBadSignature("expected a modifiers tag (" + tag + ")")
val end = readNat() + readIndex
val pflagsHi = readNat()
val pflagsLo = readNat()
val pflags = (pflagsHi.toLong << 32) + pflagsLo
val flags = pickledToRawFlags(pflags)
val privateWithin = readNameRef()
Modifiers(flags, privateWithin, Nil, Map.empty)
}
/* Read a reference to a pickled item */
protected def readNameRef(): Name = at(readNat(), readName)
protected def readSymbolRef(): Symbol = at(readNat(), readSymbol)
protected def readTypeRef(): Type = at(readNat(), () => readType()) // after the NMT_TRANSITION period, we can leave off the () => ... ()
protected def readConstantRef(): Constant = at(readNat(), readConstant)
protected def readAnnotationRef(): AnnotationInfo = at(readNat(), readAnnotation)
protected def readModifiersRef(): Modifiers = at(readNat(), readModifiers)
protected def readTreeRef(): Tree = at(readNat(), readTree)
protected def readTypeNameRef(): TypeName = mkTypeName(readNameRef())
protected def readTermNameRef(): TermName = mkTermName(readNameRef())
protected def readTemplateRef(): Template =
readTreeRef() match {
case templ:Template => templ
case other =>
errorBadSignature("expected a template (" + other + ")")
}
protected def readCaseDefRef(): CaseDef =
readTreeRef() match {
case tree:CaseDef => tree
case other =>
errorBadSignature("expected a case def (" + other + ")")
}
protected def readValDefRef(): ValDef =
readTreeRef() match {
case tree:ValDef => tree
case other =>
errorBadSignature("expected a ValDef (" + other + ")")
}
protected def readIdentRef(): Ident =
readTreeRef() match {
case tree:Ident => tree
case other =>
errorBadSignature("expected an Ident (" + other + ")")
}
protected def readTypeDefRef(): TypeDef =
readTreeRef() match {
case tree:TypeDef => tree
case other =>
errorBadSignature("expected an TypeDef (" + other + ")")
}
protected def errorBadSignature(msg: String) =
throw new RuntimeException("malformed Scala signature of " + classRoot.name + " at " + readIndex + "; " + msg)
protected def errorMissingRequirement(msg: String): Nothing =
if (debug) errorBadSignature(msg)
else throw new IOException("class file needed by "+classRoot.name+" is missing.\n"+msg)
protected def errorMissingRequirement(name: Name, owner: Symbol): Nothing =
errorMissingRequirement("reference " + NameTransformer.decode(name.toString) + " of " + owner.tpe + " refers to nonexisting symbol.")
/** pre: `fun` points to a symbol with an overloaded type.
* Selects the overloaded alternative of `fun` which best matches given
* argument types `argtpes` and result type `restpe`. Stores this alternative as
* the symbol of `fun`.
*/
def inferMethodAlternative(fun: Tree, argtpes: List[Type], restpe: Type)
/** Create a lazy type which when completed returns type at index `i`. */
def newLazyTypeRef(i: Int): LazyType
/** Create a lazy type which when completed returns type at index `i` and sets alias
* of completed symbol to symbol at index `j`
*/
def newLazyTypeRefAndAlias(i: Int, j: Int): LazyType
}
}
Other Scala examples (source code examples)
Here is a short list of links related to this Scala UnPickler.scala source code file:
|
The search page
Other Scala source code examples at this package level
Click here to learn more about this project
