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|
/* NSC -- new Scala compiler
* Copyright 2005-2010 LAMP/EPFL
* @author Iulian Dragos
*/
package scala.tools.nsc
package transform
import scala.tools.nsc.symtab.Flags
import scala.tools.nsc.util.FreshNameCreator
import scala.collection.{mutable, immutable}
/** Specialize code on types.
*/
abstract class SpecializeTypes extends InfoTransform with TypingTransformers {
import global._
import Flags._
/** the name of the phase: */
val phaseName: String = "specialize"
/** This phase changes base classes. */
override def changesBaseClasses = true
override def keepsTypeParams = true
/** Concrete types for specialization */
// final lazy val concreteTypes = List(definitions.IntClass.tpe, definitions.DoubleClass.tpe)
type TypeEnv = immutable.Map[Symbol, Type]
def emptyEnv: TypeEnv = immutable.ListMap.empty[Symbol, Type]
object TypeEnv {
/** Return a new type environment binding specialized type parameters of sym to
* the given args. Expects the lists to have the same length.
*/
def fromSpecialization(sym: Symbol, args: List[Type]): TypeEnv = {
assert(sym.info.typeParams.length == args.length, sym + " args: " + args)
var env = emptyEnv
for ((tvar, tpe) <- sym.info.typeParams.zip(args) if tvar.hasAnnotation(SpecializedClass))
env = env + ((tvar, tpe))
env
}
/** Is this typeenv included in `other'? All type variables in this environment
* are defined in `other' and bound to the same type.
*/
def includes(t1: TypeEnv, t2: TypeEnv) = {
t1 forall { kv =>
t2.get(kv._1) match {
case Some(v2) => v2 == kv._2
case _ => false
}
}
}
/** Reduce the given environment to contain mappings only for type variables in tps. */
def reduce(env: TypeEnv, tps: immutable.Set[Symbol]): TypeEnv = {
env filter { kv => tps.contains(kv._1)}
}
/** Is the given environment a valid specialization for sym?
* It is valid if each binding is from a @specialized type parameter in sym (or its owner)
* to a type for which `sym' is specialized.
*/
def isValid(env: TypeEnv, sym: Symbol): Boolean = {
def validBinding(tvar: Symbol, tpe: Type, sym: Symbol) =
(tvar.hasAnnotation(SpecializedClass)
&& sym.typeParams.contains(tvar)
&& concreteTypes(tvar).contains(tpe))
env forall { binding =>
val (tvar, tpe) = binding
// log("isValid: " + env + " sym: " + sym + " sym.tparams: " + sym.typeParams)
// log("Flag " + tvar + ": " + tvar.hasAnnotation(SpecializedClass))
// log("tparams contains: " + sym.typeParams.contains(tvar))
// log("concreteTypes: " + concreteTypes.contains(tpe))
(validBinding(tvar, tpe, sym)
|| ((sym.owner != definitions.RootClass)
&& validBinding(tvar, tpe, sym.owner)))
}
}
}
/** For a given class and concrete type arguments, give its specialized class */
val specializedClass: mutable.Map[(Symbol, TypeEnv), Symbol] = new mutable.LinkedHashMap
/** Returns the generic class that was specialized to 'cls', or
* 'cls' itself if cls is not a specialized subclass.
*/
def genericClass(cls: Symbol): Symbol =
if (cls.hasFlag(SPECIALIZED))
cls.info.parents.head.typeSymbol
else
cls
/** Map a method symbol to a list of its specialized overloads in the same class. */
private val overloads: mutable.Map[Symbol, List[Overload]] = new mutable.HashMap[Symbol, List[Overload]] {
override def default(key: Symbol): List[Overload] = Nil
}
case class Overload(sym: Symbol, env: TypeEnv) {
override def toString: String =
"specialized overload " + sym + " in " + env
}
/** The annotation used to mark specialized type parameters. */
lazy val SpecializedClass = definitions.getClass("scala.specialized")
protected def newTransformer(unit: CompilationUnit): Transformer =
new SpecializationTransformer(unit)
abstract class SpecializedInfo {
def target: Symbol
/** Are type bounds of @specialized type parameters of 'target' now in 'env'? */
def typeBoundsIn(env: TypeEnv) = false
/** A degenerated method has @specialized type parameters that appear only in
* type bounds of other @specialized type parameters (and not in its result type).
*/
def degenerate = false
def isAccessor = false
}
/** Symbol is a special overloaded method of 'original', in the environment env. */
case class SpecialOverload(original: Symbol, env: TypeEnv) extends SpecializedInfo {
def target = original
}
/** Symbol is a method that should be forwarded to 't' */
case class Forward(t: Symbol) extends SpecializedInfo {
def target = t
}
/** Symbol is a specialized accessor for the `target' field. */
case class SpecializedAccessor(target: Symbol) extends SpecializedInfo {
override def isAccessor = true
}
/** Symbol is a specialized method whose body should be the target's method body. */
case class Implementation(target: Symbol) extends SpecializedInfo
/** Symbol is a specialized override paired with `target'. */
case class SpecialOverride(target: Symbol) extends SpecializedInfo
/** An Inner class that specializes on a type parameter of the enclosing class. */
case class SpecializedInnerClass(target: Symbol, env: TypeEnv) extends SpecializedInfo
/** Symbol is a normalized member of 'target'. */
case class NormalizedMember(target: Symbol) extends SpecializedInfo {
/** Type bounds of a @specialized type var are now in the environment. */
override def typeBoundsIn(env: TypeEnv): Boolean = {
target.info.typeParams exists { tvar =>
(tvar.hasAnnotation(SpecializedClass)
&& (specializedTypeVars(tvar.info.bounds) exists env.isDefinedAt))
}
}
override lazy val degenerate = {
log("degenerate: " + target +
" stv tparams: " + specializedTypeVars(target.info.typeParams map (_.info)) +
" stv info: " + specializedTypeVars(target.info.resultType))
!(specializedTypeVars(target.info.typeParams map (_.info))
-- specializedTypeVars(target.info.resultType)).isEmpty
}
}
/** Map a symbol to additional information on specialization. */
private val info: mutable.Map[Symbol, SpecializedInfo] = new mutable.HashMap[Symbol, SpecializedInfo]
/** Has `clazz' any type parameters that need be specialized? */
def hasSpecializedParams(clazz: Symbol): Boolean =
!specializedParams(clazz).isEmpty
/** Return specialized type parameters. */
def specializedParams(sym: Symbol): List[Symbol] =
splitParams(sym.info.typeParams)._1
def splitParams(tps: List[Symbol]) =
tps.partition(_.hasAnnotation(SpecializedClass))
def unspecializedArgs(sym: Symbol, args: List[Type]): List[Type] =
for ((tvar, tpe) <- sym.info.typeParams.zip(args) if !tvar.hasAnnotation(SpecializedClass))
yield tpe
val specializedType = new TypeMap {
override def apply(tp: Type): Type = tp match {
case TypeRef(pre, sym, args) if !args.isEmpty =>
val pre1 = this(pre)
val args1 = args// map this
val unspecArgs = unspecializedArgs(sym, args)
specializedClass.get((sym, TypeEnv.fromSpecialization(sym, args1))) match {
case Some(sym1) =>
assert(sym1.info.typeParams.length == unspecArgs.length, sym1)
typeRef(pre1, sym1, unspecArgs)
case None =>
typeRef(pre1, sym, args1)
}
case _ => tp // mapOver(tp)
}
}
/** Return the specialized overload of sym in the given env, if any. */
def overload(sym: Symbol, env: TypeEnv) =
overloads(sym).find(ov => TypeEnv.includes(ov.env, env))
/** Return the specialized name of 'sym' in the given environment. It
* guarantees the same result regardless of the map order by sorting
* type variables alphabetically.
*/
private def specializedName(sym: Symbol, env: TypeEnv): Name = {
val tvars = if (sym.isClass) env.keySet
else specializedTypeVars(sym.info).intersect(env.keySet)
val (methparams, others) = tvars.toList.partition(_.owner.isMethod)
val tvars1 = methparams sortBy (_.name.toString)
val tvars2 = others sortBy (_.name.toString)
if (settings.debug.value) log("specName(" + sym + ") env " + env)
specializedName(sym.name, tvars1 map env, tvars2 map env)
}
/** Specialize name for the two list of types. The first one denotes
* specialization on method type parameters, the second on outer environment.
*/
private def specializedName(name: Name, types1: List[Type], types2: List[Type]): Name = {
if (nme.INITIALIZER == name || (types1.isEmpty && types2.isEmpty))
name
else if (nme.isSetterName(name))
nme.getterToSetter(specializedName(nme.setterToGetter(name), types1, types2))
else if (nme.isLocalName(name))
nme.getterToLocal(specializedName(nme.localToGetter(name), types1, types2))
else {
val (base, cs, ms) = nme.splitSpecializedName(name)
newTermName(base.toString + "$"
+ "m" + ms + types1.map(t => definitions.abbrvTag(t.typeSymbol)).mkString("", "", "")
+ "c" + cs + types2.map(t => definitions.abbrvTag(t.typeSymbol)).mkString("", "", "$sp"))
}
}
lazy val primitiveTypes = List(
definitions.UnitClass.tpe,
definitions.BooleanClass.tpe,
definitions.ByteClass.tpe,
definitions.ShortClass.tpe,
definitions.CharClass.tpe,
definitions.IntClass.tpe,
definitions.LongClass.tpe,
definitions.FloatClass.tpe,
definitions.DoubleClass.tpe)
/** Return the concrete types `sym' should be specialized at.
*/
def concreteTypes(sym: Symbol): List[Type] =
sym.getAnnotation(SpecializedClass) match {
case Some(AnnotationInfo(_, args, _)) =>
args match {
case Nil =>
log(sym + " specialized on everything")
primitiveTypes.toList
case _ =>
val tpes = args.map(_.symbol.companionClass.tpe)
log(sym + " specialized on " + tpes)
tpes
}
case _ =>
Nil
}
/** Return a list of all type environments for all specializations
* of @specialized types in `tps'.
*/
private def specializations(tps: List[Symbol]): List[TypeEnv] = {
val stps = tps filter (_.hasAnnotation(SpecializedClass))
val env = immutable.HashMap.empty[Symbol, Type]
count(stps, concreteTypes _) map { tps =>
immutable.HashMap.empty[Symbol, Type] ++ (stps zip tps)
}
}
/** Generate all arrangements with repetitions from the list of values,
* with 'pos' positions. For example, count(2, List(1, 2)) yields
* List(List(1, 1), List(1, 2), List(2, 1), List(2, 2))
*/
private def count[A, V](xs: List[A], values: A => List[V]): List[List[V]] = {
if (xs.isEmpty) Nil
else if (xs.tail.isEmpty) values(xs.head) map (_ :: Nil)
else for (v <- values(xs.head); vs <- count(xs.tail, values)) yield v :: vs
}
/** Does the given tpe need to be specialized in the environment 'env'?
* Specialization is needed for
* - members with specialized type parameters found in the given environment
* - constructors of specialized classes
* - normalized members whose type bounds appear in the environment
*/
private def needsSpecialization(env: TypeEnv, sym: Symbol): Boolean = {
(specializedTypeVars(sym).intersect(env.keySet).nonEmpty
|| (sym.isClassConstructor && sym.enclClass.typeParams.exists(_.hasAnnotation(SpecializedClass)))
|| (isNormalizedMember(sym) && info(sym).typeBoundsIn(env)))
}
def isNormalizedMember(m: Symbol): Boolean =
(m.hasFlag(SPECIALIZED) && (info.get(m) match {
case Some(NormalizedMember(_)) => true
case _ => false
}))
def specializedTypeVars(tpe: List[Type]): immutable.Set[Symbol] =
tpe.foldLeft(immutable.ListSet.empty[Symbol]: immutable.Set[Symbol]) {
(s, tp) => s ++ specializedTypeVars(tp)
}
def specializedTypeVars(sym: Symbol): immutable.Set[Symbol] =
specializedTypeVars(atPhase(currentRun.typerPhase)(sym.info))
/** Return the set of @specialized type variables mentioned by the given type.
* It only counts type variables that appear naked or as arguments to Java
* arrays (the only places where it makes sense to specialize).
*/
def specializedTypeVars(tpe: Type): immutable.Set[Symbol] = tpe match {
case TypeRef(pre, sym, args) =>
if ( sym.isTypeParameter && sym.hasAnnotation(SpecializedClass)
|| (sym.isTypeSkolem && sym.deSkolemize.hasAnnotation(SpecializedClass)))
immutable.ListSet.empty + sym
else if (sym == definitions.ArrayClass)
specializedTypeVars(args)
else immutable.ListSet.empty[Symbol]
case PolyType(tparams, resTpe) =>
specializedTypeVars(tparams map (_.info)) ++ specializedTypeVars(resTpe)
case MethodType(argSyms, resTpe) =>
specializedTypeVars(argSyms map (_.tpe)) ++ specializedTypeVars(resTpe)
case ExistentialType(_, res) => specializedTypeVars(res)
case AnnotatedType(_, tp, _) => specializedTypeVars(tp)
case TypeBounds(hi, lo) => specializedTypeVars(hi) ++ specializedTypeVars(lo)
case _ => immutable.ListSet.empty[Symbol]
}
/** Specialize 'clazz', in the environment `outerEnv`. The outer
* environment contains bindings for specialized types of enclosing
* classes.
*
* A class C is specialized w.r.t to its own specialized type params
* `stps`, by specializing its members, and creating a new class for
* each combination of `stps`.
*/
def specializeClass(clazz: Symbol, outerEnv: TypeEnv): List[Symbol] = {
def specializedClass(env: TypeEnv, normMembers: List[Symbol]): Symbol = {
val cls = clazz.owner.newClass(clazz.pos, specializedName(clazz, env))
.setFlag(SPECIALIZED | clazz.flags)
.resetFlag(CASE)
cls.sourceFile = clazz.sourceFile
currentRun.symSource(cls) = clazz.sourceFile // needed later on by mixin
typeEnv(cls) = env
this.specializedClass((clazz, env)) = cls
// declarations of the newly specialized class 'cls'
val decls1 = new Scope
// original unspecialized type parameters
var oldClassTParams: List[Symbol] = Nil
// unspecialized type parameters of 'cls' (cloned)
var newClassTParams: List[Symbol] = Nil
// has to be a val in order to be computed early. It is later called
// within 'atPhase(next)', which would lead to an infinite cycle otherwise
val specializedInfoType: Type = {
val (_, unspecParams) = splitParams(clazz.info.typeParams)
oldClassTParams = unspecParams
newClassTParams = cloneSymbols(unspecParams, cls) map subst(env)
def applyContext(tpe: Type) =
subst(env, tpe).subst(unspecParams, newClassTParams map (_.tpe))
/** Return a list of specialized parents to be re-mixed in a specialized subclass.
* Assuming env = [T -> Int] and
* class Integral[@specialized T] extends Numeric[T]
* and Numeric[U] is specialized on U, this produces List(Numeric$mcI).
*
* so that class Integral$mci extends Integral[Int] with Numeric$mcI.
*/
def specializedParents(parents: List[Type]): List[Type] = {
val res = new mutable.ListBuffer[Type]
for (p <- parents) {
val stp = atPhase(phase.next)(specializedType(p))
if (stp != p)
if (p.typeSymbol.isTrait) res += stp
else if (currentRun.compiles(clazz))
reporter.warning(clazz.pos, p.typeSymbol + " must be a trait. Specialized version of "
+ clazz + " will inherit generic " + p)
}
res.reverse.toList
}
var parents = List(applyContext(atPhase(currentRun.typerPhase)(clazz.tpe)))
if (parents.head.typeSymbol.isTrait)
parents = parents.head.parents.head :: parents
val extraSpecializedMixins = specializedParents(clazz.info.parents.map(applyContext))
log("extraSpecializedMixins: " + extraSpecializedMixins)
val infoType = ClassInfoType(parents ::: extraSpecializedMixins, decls1, cls)
if (newClassTParams.isEmpty) infoType else PolyType(newClassTParams, infoType)
}
log("specializedClass " + cls + ": " + specializedInfoType)
atPhase(phase.next)(cls.setInfo(specializedInfoType))
val fullEnv = outerEnv ++ env
/** Enter 'sym' in the scope of the current specialized class. It's type is
* mapped through the active environment, binding type variables to concrete
* types. The existing typeEnv for `sym' is composed with the current active
* environment
*/
def enterMember(sym: Symbol): Symbol = {
typeEnv(sym) = fullEnv ++ typeEnv(sym) // append the full environment
sym.setInfo(sym.info.substThis(clazz, ThisType(cls)).subst(oldClassTParams, newClassTParams map (_.tpe)))
decls1.enter(subst(fullEnv)(sym))
}
/** Create and enter in scope an overridden symbol m1 for `m' that forwards
* to `om'. `om' is a fresh, special overload of m1 that is an implementation
* of `m'. For example, for a
*
* class Foo[@specialized A] {
* def m(x: A) = <body>
* }
* , for class Foo$I extends Foo[Int], this method enters two new symbols in
* the scope of Foo$I:
*
* def m(x: Int) = m$I(x)
* def m$I(x: Int) = <body>/adapted to env {A -> Int}
*/
def forwardToOverload(m: Symbol): Symbol = {
val specMember = enterMember(m.cloneSymbol(cls)).setFlag(OVERRIDE | SPECIALIZED).resetFlag(DEFERRED | CASEACCESSOR)
val om = specializedOverload(cls, m, env).setFlag(OVERRIDE)
var original = info.get(m) match {
case Some(NormalizedMember(tg)) => tg
case _ => m
}
info(specMember) = Forward(om)
info(om) = if (original.isDeferred) Forward(original) else Implementation(original)
typeEnv(om) = env ++ typeEnv(m) // add the environment for any method tparams
overloads(specMember) = Overload(om, typeEnv(om)) :: overloads(specMember)
enterMember(om)
}
log("specializedClass: " + cls)
for (m <- normMembers if needsSpecialization(outerEnv ++ env, m) && satisfiable(fullEnv)) {
if (settings.debug.value) log(" * looking at: " + m)
if (!m.isDeferred) concreteSpecMethods += m
// specialized members have to be overridable.
if (m.hasFlag(PRIVATE))
m.resetFlag(PRIVATE).setFlag(PROTECTED)
if (m.isConstructor) {
val specCtor = enterMember(m.cloneSymbol(cls).setFlag(SPECIALIZED))
info(specCtor) = Forward(m)
} else if (isNormalizedMember(m)) { // methods added by normalization
val NormalizedMember(original) = info(m)
if (!conflicting(env ++ typeEnv(m))) {
if (info(m).degenerate) {
if (settings.debug.value) log("degenerate normalized member " + m + " info(m): " + info(m))
val specMember = enterMember(m.cloneSymbol(cls)).setFlag(SPECIALIZED).resetFlag(DEFERRED)
info(specMember) = Implementation(original)
typeEnv(specMember) = env ++ typeEnv(m)
} else {
val om = forwardToOverload(m)
if (settings.debug.value) log("normalizedMember " + m + " om: " + om + " typeEnv(om): " + typeEnv(om))
}
} else
log("conflicting env for " + m + " env: " + env)
} else if (m.isDeferred) { // abstract methods
val specMember = enterMember(m.cloneSymbol(cls)).setFlag(SPECIALIZED).resetFlag(DEFERRED)
if (settings.debug.value) log("deferred " + specMember.fullName + " is forwarded")
info(specMember) = new Forward(specMember) {
override def target = m.owner.info.member(specializedName(m, env))
}
} else if (m.isMethod && !m.hasFlag(ACCESSOR)) { // other concrete methods
forwardToOverload(m)
} else if (m.isValue && !m.isMethod) { // concrete value definition
def mkAccessor(field: Symbol, name: Name) = {
val sym = cls.newMethod(field.pos, name)
.setFlag(SPECIALIZED | m.getter(clazz).flags)
.resetFlag(LOCAL | PARAMACCESSOR | CASEACCESSOR | LAZY) // we rely on the super class to initialize param accessors
info(sym) = SpecializedAccessor(field)
sym
}
def overrideIn(clazz: Symbol, sym: Symbol) = {
val sym1 = sym.cloneSymbol(clazz)
.setFlag(OVERRIDE | SPECIALIZED)
.resetFlag(DEFERRED | CASEACCESSOR | ACCESSOR | PARAMACCESSOR | LAZY)
sym1.setInfo(sym1.info.asSeenFrom(clazz.tpe, sym1.owner))
}
val specVal = specializedOverload(cls, m, env)
concreteSpecMethods += m
specVal.asInstanceOf[TermSymbol].setAlias(m)
enterMember(specVal)
// create accessors
if (settings.debug.value)
log("m: " + m + " isLocal: " + nme.isLocalName(m.name) + " specVal: " + specVal.name + " isLocal: " + nme.isLocalName(specVal.name))
if (nme.isLocalName(m.name)) {
val specGetter = mkAccessor(specVal, nme.localToGetter(specVal.name)).setInfo(MethodType(List(), specVal.info))
val origGetter = overrideIn(cls, m.getter(clazz))
info(origGetter) = Forward(specGetter)
enterMember(specGetter)
enterMember(origGetter)
if (settings.debug.value) log("created accessors: " + specGetter + " orig: " + origGetter)
clazz.caseFieldAccessors.find(_.name.startsWith(m.name)) foreach { cfa =>
val cfaGetter = overrideIn(cls, cfa)
info(cfaGetter) = SpecializedAccessor(specVal)
enterMember(cfaGetter)
if (settings.debug.value) log("found case field accessor for " + m + " added override " + cfaGetter);
}
if (specVal.isVariable && m.setter(clazz) != NoSymbol) {
val specSetter = mkAccessor(specVal, nme.getterToSetter(specGetter.name))
.resetFlag(STABLE)
specSetter.setInfo(MethodType(specSetter.newSyntheticValueParams(List(specVal.info)),
definitions.UnitClass.tpe))
val origSetter = overrideIn(cls, m.setter(clazz))
info(origSetter) = Forward(specSetter)
enterMember(specSetter)
enterMember(origSetter)
}
} else { // if there are no accessors, specialized methods will need to access this field in specialized subclasses
m.resetFlag(PRIVATE)
specVal.resetFlag(PRIVATE)
}
} else if (m.isClass) {
val specClass: Symbol = m.cloneSymbol(cls).setFlag(SPECIALIZED)
typeEnv(specClass) = fullEnv
specClass.name = specializedName(specClass, fullEnv)
enterMember(specClass)
log("entered specialized class " + specClass.fullName)
info(specClass) = SpecializedInnerClass(m, fullEnv)
}
}
cls
}
log("specializeClass " + clazz.fullName)
val decls1 = (clazz.info.decls.toList flatMap { m: Symbol =>
if (m.isAnonymousClass) List(m) else {
normalizeMember(m.owner, m, outerEnv) flatMap { normalizedMember =>
val ms = specializeMember(m.owner, normalizedMember, outerEnv, clazz.info.typeParams)
// atPhase(currentRun.typerPhase)(println("normalizedMember.info: " + normalizedMember.info)) // bring the info to the typer phase
if (normalizedMember.isMethod) {
val newTpe = subst(outerEnv, normalizedMember.info)
if (newTpe != normalizedMember.info) // only do it when necessary, otherwise the method type might be at a later phase already
normalizedMember.updateInfo(newTpe) :: ms
else
normalizedMember :: ms
} else
normalizedMember :: ms
}
}
})
var hasSubclasses = false
for (env <- specializations(clazz.info.typeParams) if satisfiable(env)) {
val spc = specializedClass(env, decls1)
log("entered " + spc + " in " + clazz.owner)
hasSubclasses = true
atPhase(phase.next)(clazz.owner.info.decls enter spc) //!! assumes fully specialized classes
}
if (hasSubclasses) clazz.resetFlag(FINAL)
decls1
}
/** Expand member `sym' to a set of normalized members. Normalized members
* are monomorphic or polymorphic only in non-specialized types.
*
* Given method m[@specialized T, U](x: T, y: U) it returns
* m[T, U](x: T, y: U),
* m$I[ U](x: Int, y: U),
* m$D[ U](x: Double, y: U)
*/
private def normalizeMember(owner: Symbol, sym: Symbol, outerEnv: TypeEnv): List[Symbol] = {
if (settings.debug.value) log("normalizeMember: " + sym.fullName)
if (sym.isMethod && !atPhase(currentRun.typerPhase)(sym.typeParams.isEmpty)) {
val (stps, tps) = splitParams(sym.info.typeParams)
val res = sym :: (for (env <- specializations(stps) if needsSpecialization(env, sym)) yield {
val keys = env.keysIterator.toList;
val vals = env.valuesIterator.toList
val specMember = sym.cloneSymbol(owner).setFlag(SPECIALIZED).resetFlag(DEFERRED)
specMember.name = specializedName(sym, env)
typeEnv(specMember) = outerEnv ++ env
val tps1 = cloneSymbols(tps)
for (tp <- tps1) tp.setInfo(tp.info.subst(keys, vals))
// the cloneInfo is necessary so that method parameter symbols are cloned at the new owner
val methodType = sym.info.resultType.subst(keys ::: tps, vals ::: (tps1 map (_.tpe))).cloneInfo(specMember)
specMember.setInfo(polyType(tps1, methodType))
if (settings.debug.value) log("expanded member: " + sym + ": " + sym.info + " -> " + specMember + ": " + specMember.info + " env: " + env)
info(specMember) = NormalizedMember(sym)
overloads(sym) = Overload(specMember, env) :: overloads(sym)
specMember
})
//stps foreach (_.removeAttribute(SpecializedClass))
res
} else List(sym)
}
/** Specialize member `m' w.r.t. to the outer environment and the type parameters of
* the innermost enclosing class.
*
* Turns 'private' into 'protected' for members that need specialization.
*
* Return a list of symbols that are specializations of 'sym', owned by 'owner'.
*/
private def specializeMember(owner: Symbol, sym: Symbol, outerEnv: TypeEnv, tps: List[Symbol]): List[Symbol] = {
def specializeOn(tparams: List[Symbol]): List[Symbol] =
for (spec <- specializations(tparams)) yield {
if (sym.hasFlag(PRIVATE)) sym.resetFlag(PRIVATE).setFlag(PROTECTED)
val specMember = subst(outerEnv)(specializedOverload(owner, sym, spec))
typeEnv(specMember) = outerEnv ++ spec
overloads(sym) = Overload(specMember, spec) :: overloads(sym)
specMember
}
if (sym.isMethod) {
// log("specializeMember " + sym + " with own stps: " + specializedTypes(sym.info.typeParams))
val tps1 = if (sym.isConstructor) tps filter (tp => sym.info.paramTypes.contains(tp)) else tps
val tps2 = tps1 intersect specializedTypeVars(sym).toList
if (!sym.isDeferred) concreteSpecMethods += sym
specializeOn(tps2) map {m => info(m) = SpecialOverload(sym, typeEnv(m)); m}
} else
List()
}
/** Return the specialized overload of `m', in the given environment. */
private def specializedOverload(owner: Symbol, sym: Symbol, env: TypeEnv): Symbol = {
val specMember = sym.cloneSymbol(owner) // this method properly duplicates the symbol's info
specMember.name = specializedName(sym, env)
specMember.setInfo(subst(env, specMember.info))
.setFlag(SPECIALIZED)
.resetFlag(DEFERRED | CASEACCESSOR | ACCESSOR | LAZY)
}
/** For each method m that overrides inherited method m', add a special
* overload method `om' that overrides the corresponding overload in the
* superclass. For the following example:
*
* class IntFun extends Function1[Int, Int] {
* def apply(x: Int): Int = ..
* }
*
* this method will return List('apply$spec$II')
*/
private def specialOverrides(clazz: Symbol): List[Symbol] = {
log("specialOverrides(" + clazz + ")")
val oms = new mutable.ListBuffer[Symbol]
for (overriding <- clazz.info.decls;
val allOverridden = overriding.allOverriddenSymbols
if !allOverridden.isEmpty;
val overridden = allOverridden.head) {
if (settings.debug.value)
log("\toverriding pairs: " + overridden.fullName + ": " + overridden.info
+ " overriden by " + overriding.fullName + ": " + overriding.info)
if (overriding.owner == clazz && !specializedTypeVars(overridden.info).isEmpty) {
if (settings.debug.value) log("\t\tspecializedTVars: " + specializedTypeVars(overridden.info))
val env = unify(overridden.info, overriding.info, emptyEnv)
if (settings.debug.value)
log("\t\tenv: " + env + "isValid: "
+ TypeEnv.isValid(env, overridden)
+ " looking for: " + specializedName(overridden, env) + " in:\n"
+ atPhase(phase.next)(overridden.owner.info.decls)
+ "found: " + atPhase(phase.next)(overridden.owner.info.decl(specializedName(overridden, env))))
if (!env.isEmpty
&& TypeEnv.isValid(env, overridden)
&& atPhase(phase.next)(overridden.owner.info.decl(specializedName(overridden, env))) != NoSymbol) {
log("Added specialized overload for " + overriding.fullName + " in env: " + env)
val om = specializedOverload(clazz, overridden, env)
typeEnv(om) = env
concreteSpecMethods += overriding
if (!overriding.isDeferred) {
// if the override is a normalized member, 'om' gets the implementation from
// its original target, and adds the environment of the normalized member (that is,
// any specialized /method/ type parameter bindings)
info(om) = info.get(overriding) match {
case Some(NormalizedMember(target)) =>
typeEnv(om) = env ++ typeEnv(overriding)
SpecialOverride(target)
case _ => SpecialOverride(overriding)
}
info(overriding) = Forward(om)
om setPos overriding.pos // set the position of the concrete, overriding member
} else {
// abstract override
if (settings.debug.value) log("abstract override " + overriding.fullName + " with specialized " + om.fullName)
info(om) = Forward(overriding)
}
overloads(overriding) = Overload(om, env) :: overloads(overriding)
oms += om
atPhase(phase.next)(
assert(overridden.owner.info.decl(om.name) != NoSymbol,
"Could not find " + om.name + " in " + overridden.owner.info.decls))
}
}
}
oms.toList
}
/** Return the most general type environment that specializes tp1 to tp2.
* It only allows binding of type parameters annotated with @specialized.
* Fails if such an environment cannot be found.
*/
private def unify(tp1: Type, tp2: Type, env: TypeEnv): TypeEnv = {
// println("\tunify \t" + tp1 + "\n\t\t" + tp2)
(tp1, tp2) match {
case (TypeRef(_, sym1, _), _) if sym1.hasAnnotation(SpecializedClass) =>
if (definitions.isValueClass(tp2.typeSymbol))
env + ((sym1, tp2))
else
env
case (TypeRef(_, sym1, args1), TypeRef(_, sym2, args2)) =>
unify(args1, args2, env)
case (TypeRef(_, sym1, _), _) if sym1.isTypeParameterOrSkolem =>
env
case (MethodType(params1, res1), MethodType(params2, res2)) =>
unify(res1 :: (params1 map (_.tpe)), res2 :: (params2 map (_.tpe)), env)
case (PolyType(tparams1, res1), PolyType(tparams2, res2)) =>
unify(res1, res2, env)
case (PolyType(_, res), other) =>
unify(res, other, env)
case (ThisType(_), ThisType(_)) => env
case (_, SingleType(_, _)) => unify(tp1, tp2.underlying, env)
case (SingleType(_, _), _) => unify(tp1.underlying, tp2, env)
case (ThisType(_), _) => unify(tp1.widen, tp2, env)
case (_, ThisType(_)) => unify(tp1, tp2.widen, env)
case (RefinedType(_, _), RefinedType(_, _)) => env
case (AnnotatedType(_, tp1, _), tp2) => unify(tp2, tp1, env)
case (ExistentialType(_, res1), _) => unify(tp2, res1, env)
}
}
private def unify(tp1: List[Type], tp2: List[Type], env: TypeEnv): TypeEnv =
tp1.zip(tp2).foldLeft(env) { (env, args) =>
unify(args._1, args._2, env)
}
private def specializedTypes(tps: List[Symbol]) = tps.filter(_.hasAnnotation(SpecializedClass))
/** Map class symbols to the type environments where they were created. */
val typeEnv: mutable.Map[Symbol, TypeEnv] = new mutable.HashMap[Symbol, TypeEnv] {
override def default(key: Symbol) = emptyEnv
}
/** Apply type bindings in the given environment `env' to all declarations. */
private def subst(env: TypeEnv, decls: List[Symbol]): List[Symbol] =
decls map subst(env)
/** Apply the type environment 'env' to the given type. All type
* bindings are supposed to be to primitive types. A type variable
* that is annotated with 'uncheckedVariance' is mapped to the corresponding
* primitive type losing the annotation.
*/
private def subst(env: TypeEnv, tpe: Type): Type = {
class FullTypeMap(from: List[Symbol], to: List[Type]) extends SubstTypeMap(from, to) {
override def mapOver(tp: Type): Type = tp match {
case ClassInfoType(parents, decls, clazz) =>
val parents1 = parents mapConserve (this);
val declsList = decls.toList
val decls1 = mapOver(declsList);
if ((parents1 eq parents) && (decls1 eq declsList)) tp
else ClassInfoType(parents1, new Scope(decls1), clazz)
case AnnotatedType(annots, atp, selfsym) =>
val annots1 = mapOverAnnotations(annots)
val atp1 = this(atp)
if ((annots1 eq annots) && (atp1 eq atp)) tp
else if (annots1.isEmpty) atp1
else if (atp1 ne atp) {
val annots2 = annots1.filter(_.atp.typeSymbol != definitions.uncheckedVarianceClass)
if (annots2.isEmpty) atp1
else AnnotatedType(annots2, atp1, selfsym)
} else
AnnotatedType(annots1, atp1, selfsym)
case _ => super.mapOver(tp)
}
}
// disabled because of bugs in std. collections
//val (keys, values) = env.iterator.toList.unzip
val keys = env.keysIterator.toList
val values = env.valuesIterator.toList
(new FullTypeMap(keys, values))(tpe)
// tpe.subst(keys, values)
}
private def subst(env: TypeEnv)(decl: Symbol): Symbol = {
val tpe = subst(env, decl.info)
decl.setInfo(if (decl.isConstructor) tpe match {
case MethodType(args, resTpe) => MethodType(args, decl.owner.tpe)
} else tpe)
}
/** Type transformation.
*/
override def transformInfo(sym: Symbol, tpe: Type): Type = {
val res = tpe match {
case PolyType(targs, ClassInfoType(base, decls, clazz)) =>
val parents = base map specializedType
if (settings.debug.value) log("transformInfo (poly) " + clazz + " with parents1: " + parents + " ph: " + phase)
// if (clazz.name.toString == "$colon$colon")
// (new Throwable).printStackTrace
PolyType(targs, ClassInfoType(parents,
new Scope(specializeClass(clazz, typeEnv(clazz)) ::: specialOverrides(clazz)),
clazz))
case ClassInfoType(base, decls, clazz) if !clazz.isPackageClass =>
atPhase(phase.next)(base.map(_.typeSymbol.info))
val parents = base map specializedType
if (settings.debug.value) log("transformInfo " + clazz + " with parents1: " + parents + " ph: " + phase)
val res = ClassInfoType(base map specializedType,
new Scope(specializeClass(clazz, typeEnv(clazz)) ::: specialOverrides(clazz)),
clazz)
res
case _ =>
tpe
}
res
}
def conflicting(env: TypeEnv): Boolean = {
val silent = (pos: Position, str: String) => ()
conflicting(env, silent)
}
/** Is any type variable in `env' conflicting with any if its type bounds, when
* type bindings in `env' are taken into account?
*
* A conflicting type environment could still be satisfiable.
*/
def conflicting(env: TypeEnv, warn: (Position, String) => Unit): Boolean =
env exists { case (tvar, tpe) =>
if (!((subst(env, tvar.info.bounds.lo) <:< tpe)
&& (tpe <:< subst(env, tvar.info.bounds.hi)))) {
warn(tvar.pos, "Bounds prevent specialization for " + tvar)
true
} else false
}
/** The type environment is sound w.r.t. to all type bounds or only soft
* conflicts appear. An environment is sound if all bindings are within
* the bounds of the given type variable. A soft conflict is a binding
* that does not fall within the bounds, but whose bounds contain
* type variables that are @specialized, (that could become satisfiable).
*/
def satisfiable(env: TypeEnv, warn: (Position, String) => Unit): Boolean = {
def matches(tpe1: Type, tpe2: Type): Boolean = {
val t1 = subst(env, tpe1)
val t2 = subst(env, tpe2)
((t1 <:< t2)
|| !specializedTypeVars(t1).isEmpty
|| !specializedTypeVars(t2).isEmpty)
}
env forall { case (tvar, tpe) =>
((matches(tvar.info.bounds.lo, tpe)
&& matches(tpe, tvar.info.bounds.hi))
|| { warn(tvar.pos, "Bounds prevent specialization of " + tvar);
log("specvars: "
+ tvar.info.bounds.lo + ": " + specializedTypeVars(tvar.info.bounds.lo)
+ " " + subst(env, tvar.info.bounds.hi) + ": " + specializedTypeVars(subst(env, tvar.info.bounds.hi)))
false })
}
}
def satisfiable(env: TypeEnv): Boolean = {
val silent = (pos: Position, str: String) => ()
satisfiable(env, silent)
}
/*************************** Term transformation ************************************/
class Duplicator extends {
val global: SpecializeTypes.this.global.type = SpecializeTypes.this.global
} with typechecker.Duplicators
def specializeCalls(unit: CompilationUnit) = new TypingTransformer(unit) {
/** Map a specializable method to it's rhs, when not deferred. */
val body: mutable.Map[Symbol, Tree] = new mutable.HashMap
/** Map a specializable method to its value parameter symbols. */
val parameters: mutable.Map[Symbol, List[List[Symbol]]] = new mutable.HashMap
/** Collect method bodies that are concrete specialized methods.
*/
class CollectMethodBodies extends Traverser {
override def traverse(tree: Tree) = tree match {
case DefDef(mods, name, tparams, vparamss, tpt, rhs) =>
if (concreteSpecMethods(tree.symbol) || tree.symbol.isConstructor) {
if (settings.debug.value) log("adding body of " + tree.symbol)
body(tree.symbol) = rhs
// body(tree.symbol) = tree // whole method
parameters(tree.symbol) = vparamss map (_ map (_.symbol))
} // no need to descend further down inside method bodies
case ValDef(mods, name, tpt, rhs) if concreteSpecMethods(tree.symbol) =>
body(tree.symbol) = rhs
//super.traverse(tree)
case _ =>
super.traverse(tree)
}
}
override def transform(tree: Tree): Tree = {
val symbol = tree.symbol
/** The specialized symbol of 'tree.symbol' for tree.tpe, if there is one */
def specSym(qual: Tree): Option[Symbol] = {
val env = unify(symbol.tpe, tree.tpe, emptyEnv)
log("checking for rerouting: " + tree + " with sym.tpe: " + symbol.tpe + " tree.tpe: " + tree.tpe + " env: " + env)
if (!env.isEmpty) { // a method?
val specMember = overload(symbol, env)
if (specMember.isDefined) Some(specMember.get.sym)
else { // a field?
val specMember = qual.tpe.member(specializedName(symbol, env))
if (specMember ne NoSymbol) Some(specMember)
else None
}
} else None
}
def maybeTypeApply(fun: Tree, targs: List[Tree]) =
if (targs.isEmpty)fun else TypeApply(fun, targs)
curTree = tree
tree match {
case Apply(Select(New(tpt), nme.CONSTRUCTOR), args) =>
if (findSpec(tpt.tpe).typeSymbol ne tpt.tpe.typeSymbol) {
log("** instantiated specialized type: " + findSpec(tpt.tpe))
atPos(tree.pos)(
localTyper.typed(
Apply(
Select(New(TypeTree(findSpec(tpt.tpe))), nme.CONSTRUCTOR),
transformTrees(args))))
} else super.transform(tree)
case TypeApply(Select(qual, name), targs)
if (!specializedTypeVars(symbol.info).isEmpty && name != nme.CONSTRUCTOR) =>
if (settings.debug.value) log("checking typeapp for rerouting: " + tree + " with sym.tpe: " + symbol.tpe + " tree.tpe: " + tree.tpe)
val qual1 = transform(qual)
specSym(qual1) match {
case Some(specMember) =>
if (settings.debug.value) log("found " + specMember)
assert(symbol.info.typeParams.length == targs.length)
val env = typeEnv(specMember)
val residualTargs =
for ((tvar, targ) <-symbol.info.typeParams.zip(targs) if !env.isDefinedAt(tvar))
yield targ
assert(residualTargs.length == specMember.info.typeParams.length)
val tree1 = maybeTypeApply(Select(qual1, specMember), residualTargs)
log("rewrote " + tree + " to " + tree1)
localTyper.typedOperator(atPos(tree.pos)(tree1)) // being polymorphic, it must be a method
case None => super.transform(tree)
}
case Select(qual, name) =>
if (settings.debug.value)
log("looking at Select: " + tree + " sym: " + symbol + ": " + symbol.info + "[tree.tpe: " + tree.tpe + "]")
//if (settings.debug.value) log("\toverloads: " + overloads.mkString("", "\n", ""))
if (!specializedTypeVars(symbol.info).isEmpty && name != nme.CONSTRUCTOR) {
if (settings.debug.value)
log("checking for unification at " + tree + " with sym.tpe: " + symbol.tpe + " and tree.tpe: " + tree.tpe + " at " + tree.pos.line)
val env = unify(symbol.tpe, tree.tpe, emptyEnv)
if (settings.debug.value) log("checking for rerouting: " + tree + " with sym.tpe: " + symbol.tpe + " tree.tpe: " + tree.tpe + " env: " + env)
if (!env.isEmpty) {
val specMember = overload(symbol, env)
if (specMember.isDefined) {
log("** routing " + tree + " to " + specMember.get.sym.fullName)
localTyper.typedOperator(atPos(tree.pos)(Select(transform(qual), specMember.get.sym.name)))
} else {
val qual1 = transform(qual)
val specMember = qual1.tpe.member(specializedName(symbol, env)).suchThat(_.tpe matches subst(env, symbol.tpe))
if (specMember ne NoSymbol) {
log("** using spec member " + specMember + ": " + specMember.tpe)
val tree1 = atPos(tree.pos)(Select(qual1, specMember))
if (specMember.isMethod)
localTyper.typedOperator(tree1)
else
localTyper.typed(tree1)
} else
treeCopy.Select(tree, qual1, name)
}
} else
super.transform(tree)
} else overloads(symbol).find(_.sym.info =:= symbol.info) match {
case Some(specMember) =>
val qual1 = transform(qual)
if (settings.debug.value) log("** routing " + tree + " to " + specMember.sym.fullName + " tree: " + Select(qual1, specMember.sym.name))
localTyper.typedOperator(atPos(tree.pos)(Select(qual1, specMember.sym.name)))
case None =>
super.transform(tree)
}
case PackageDef(pid, stats) =>
tree.symbol.info // make sure specializations have been performed
atOwner(tree, symbol) {
val specMembers = implSpecClasses(stats) map localTyper.typed
treeCopy.PackageDef(tree, pid, transformStats(stats ::: specMembers, symbol.moduleClass))
}
case Template(parents, self, body) =>
val specMembers = makeSpecializedMembers(tree.symbol.enclClass) ::: (implSpecClasses(body) map localTyper.typed)
if (!symbol.isPackageClass)
(new CollectMethodBodies)(tree)
val parents1 = currentOwner.info.parents.zipWithIndex.map {
case (tpe, idx) => TypeTree(tpe) setPos parents(idx).pos
}
treeCopy.Template(tree,
parents1 /*currentOwner.info.parents.map(tpe => TypeTree(tpe) setPos parents.head.pos)*/ ,
self,
atOwner(currentOwner)(transformTrees(body ::: specMembers)))
case ddef @ DefDef(mods, name, tparams, vparamss, tpt, rhs) if info.isDefinedAt(symbol) =>
if (symbol.isConstructor) {
val t = atOwner(symbol) {
val superRef: Tree = Select(Super(nme.EMPTY.toTypeName, nme.EMPTY.toTypeName), nme.CONSTRUCTOR)
forwardCall(tree.pos, superRef, vparamss)
}
val tree1 = atPos(symbol.pos)(treeCopy.DefDef(tree, mods, name, tparams, vparamss, tpt, Block(List(t), Literal(()))))
localTyper.typed(tree1)
} else info(symbol) match {
case Implementation(target) =>
assert(body.isDefinedAt(target), "sym: " + symbol.fullName + " target: " + target.fullName)
// we have an rhs, specialize it
val tree1 = duplicateBody(ddef, target)
if (settings.debug.value) log("implementation: " + tree1)
val DefDef(mods, name, tparams, vparamss, tpt, rhs) = tree1
treeCopy.DefDef(tree1, mods, name, tparams, vparamss, tpt, transform(rhs))
case NormalizedMember(target) =>
if (target.isDeferred || conflicting(typeEnv(symbol))) {
treeCopy.DefDef(tree, mods, name, tparams, vparamss, tpt,
localTyper.typed(
Apply(gen.mkAttributedRef(definitions.Predef_error),
List(Literal("boom! you stepped on a bug. This method should never be called.")))))
} else {
// we have an rhs, specialize it
val tree1 = duplicateBody(ddef, target)
if (settings.debug.value) log("implementation: " + tree1)
val DefDef(mods, name, tparams, vparamss, tpt, rhs) = tree1
treeCopy.DefDef(tree1, mods, name, tparams, vparamss, tpt, transform(rhs))
}
case SpecialOverride(target) =>
assert(body.isDefinedAt(target), "sym: " + symbol.fullName + " target: " + target.fullName)
if (settings.debug.value) log("moving implementation: " + body(target))
// we have an rhs, specialize it
val tree1 = addBody(ddef, target)
(new ChangeOwnerTraverser(target, tree1.symbol))(tree1.rhs)
if (settings.debug.value)
println("changed owners, now: " + tree1)
val DefDef(mods, name, tparams, vparamss, tpt, rhs) = tree1
treeCopy.DefDef(tree1, mods, name, tparams, vparamss, tpt, transform(rhs))
case SpecialOverload(original, env) =>
if (settings.debug.value) log("completing specialized " + symbol.fullName + " calling " + original)
val t = DefDef(symbol, { vparamss =>
val fun = Apply(Select(This(symbol.owner), original),
makeArguments(original, vparamss.head))
gen.maybeMkAsInstanceOf(fun,
symbol.owner.thisType.memberType(symbol).finalResultType,
symbol.owner.thisType.memberType(original).finalResultType)
})
if (settings.debug.value) log("created " + t)
localTyper.typed(t)
case fwd @ Forward(_) =>
val rhs1 = forwardCall(tree.pos, gen.mkAttributedRef(symbol.owner.thisType, fwd.target), vparamss)
if (settings.debug.value)
log("completed forwarder to specialized overload: " + fwd.target + ": " + rhs1)
localTyper.typed(treeCopy.DefDef(tree, mods, name, tparams, vparamss, tpt, rhs1))
case SpecializedAccessor(target) =>
val rhs1 = if (symbol.isGetter)
gen.mkAttributedRef(target)
else
Assign(gen.mkAttributedRef(target), Ident(vparamss.head.head.symbol))
localTyper.typed(treeCopy.DefDef(tree, mods, name, tparams, vparamss, tpt, rhs1))
}
case ValDef(mods, name, tpt, rhs) if symbol.hasFlag(SPECIALIZED) && !symbol.hasFlag(PARAMACCESSOR) =>
assert(body.isDefinedAt(symbol.alias))
val tree1 = treeCopy.ValDef(tree, mods, name, tpt, body(symbol.alias).duplicate)
if (settings.debug.value) log("now typing: " + tree1 + " in " + tree.symbol.owner.fullName)
val d = new Duplicator
d.retyped(localTyper.context1.asInstanceOf[d.Context],
tree1,
symbol.alias.enclClass,
symbol.enclClass,
typeEnv(symbol.alias) ++ typeEnv(tree.symbol))
// val tree1 =
// treeCopy.ValDef(tree, mods, name, tpt,
// localTyper.typed(
// Apply(Select(Super(currentClass, nme.EMPTY), symbol.alias.getter(symbol.alias.owner)),
// List())))
// if (settings.debug.value) log("replaced ValDef: " + tree1 + " in " + tree.symbol.owner.fullName)
// tree1
case Apply(sel @ Select(sup @ Super(qual, name), name1), args)
if (sup.symbol.info.parents != atPhase(phase.prev)(sup.symbol.info.parents)) =>
def parents = sup.symbol.info.parents
if (settings.debug.value) log(tree + " parents changed from: " + atPhase(phase.prev)(parents) + " to: " + parents)
val res = localTyper.typed(
Apply(Select(Super(qual, name) setPos sup.pos, name1) setPos sel.pos, transformTrees(args)) setPos tree.pos)
if (settings.debug.value) log("retyping call to super, from: " + symbol + " to " + res.symbol)
res
case _ =>
super.transform(tree)
}
}
private def reskolemize(tparams: List[TypeDef]): (List[Symbol], List[Symbol]) = {
val tparams1 = tparams map (_.symbol)
localTyper.namer.skolemize(tparams)
(tparams1, tparams map (_.symbol))
}
private def duplicateBody(tree: DefDef, source: Symbol) = {
val symbol = tree.symbol
val meth = addBody(tree, source)
if (settings.debug.value) log("now typing: " + meth + " in " + symbol.owner.fullName)
val d = new Duplicator
d.retyped(localTyper.context1.asInstanceOf[d.Context],
meth,
source.enclClass,
symbol.enclClass,
typeEnv(source) ++ typeEnv(symbol))
}
/** Put the body of 'source' as the right hand side of the method 'tree'.
* The destination method gets fresh symbols for type and value parameters,
* and the body is updated to the new symbols, and owners adjusted accordingly.
* However, if the same source tree is used in more than one place, full re-typing
* is necessary. @see method duplicateBody
*/
private def addBody(tree: DefDef, source: Symbol): DefDef = {
val symbol = tree.symbol
if (settings.debug.value) log("specializing body of" + symbol.fullName + ": " + symbol.info)
val DefDef(mods, name, tparams, vparamss, tpt, _) = tree
val (_, origtparams) = splitParams(source.typeParams)
if (settings.debug.value) log("substituting " + origtparams + " for " + symbol.typeParams)
// skolemize type parameters
val (oldtparams, newtparams) = reskolemize(tparams)
// create fresh symbols for value parameters to hold the skolem types
val vparamss1 = List(for (vdef <- vparamss.head; param = vdef.symbol) yield {
ValDef(param.cloneSymbol(symbol).setInfo(param.info.substSym(oldtparams, newtparams)))
})
// replace value and type parameters of the old method with the new ones
val symSubstituter = new ImplementationAdapter(
parameters(source).flatten ::: origtparams,
vparamss1.flatten.map(_.symbol) ::: newtparams,
source.enclClass)
val tmp = symSubstituter(body(source).duplicate)
tpt.tpe = tpt.tpe.substSym(oldtparams, newtparams)
treeCopy.DefDef(tree, mods, name, tparams, vparamss1, tpt, tmp)
}
/** A tree symbol substituter that substitutes on type skolems.
* If a type parameter is a skolem, it looks for the original
* symbol in the 'from' and maps it to the corresponding new
* symbol. The new symbol should probably be a type skolem as
* well (not enforced).
*
* All private members are made protected in order to be accessible from
* specialized classes.
*/
class ImplementationAdapter(from: List[Symbol], to: List[Symbol], targetClass: Symbol) extends TreeSymSubstituter(from, to) {
override val symSubst = new SubstSymMap(from, to) {
override def matches(sym1: Symbol, sym2: Symbol) =
if (sym2.isTypeSkolem) sym2.deSkolemize eq sym1
else sym1 eq sym2
}
private def isAccessible(sym: Symbol): Boolean =
(currentClass == sym.owner.enclClass) && (currentClass != targetClass)
/** All private members that are referenced are made protected,
* in order to be accessible from specialized subclasses.
*/
override def transform(tree: Tree): Tree = tree match {
case Select(qual, name) =>
val sym = tree.symbol
if (sym.hasFlag(PRIVATE))
if (settings.debug.value) log("seeing private member " + sym + " targetClass: " + currentClass + " owner: " + sym.owner.enclClass)
if (sym.hasFlag(PRIVATE | PROTECTED) && !nme.isLocalName(sym.name) && !isAccessible(sym)) {
if (settings.debug.value) log("changing private flag of " + sym)
// tree.symbol.resetFlag(PRIVATE).setFlag(PROTECTED)
sym.makeNotPrivate(sym.owner)
// tree.symbol.resetFlag(PRIVATE | PROTECTED)
// tree.symbol.privateWithin = NoSymbol
}
super.transform(tree)
case _ =>
super.transform(tree)
}
}
def warn(clazz: Symbol)(pos: Position, err: String) =
if (!clazz.hasFlag(SPECIALIZED))
unit.warning(pos, err)
/** Create trees for specialized members of 'cls', based on the
* symbols that are already there.
*/
private def makeSpecializedMembers(cls: Symbol): List[Tree] = {
// add special overrides first
// if (!cls.hasFlag(SPECIALIZED))
// for (m <- specialOverrides(cls)) cls.info.decls.enter(m)
val mbrs = new mutable.ListBuffer[Tree]
var hasSpecializedFields = false
for (m <- cls.info.decls.toList
if m.hasFlag(SPECIALIZED)
&& (m.sourceFile ne null)
&& satisfiable(typeEnv(m), warn(cls))) {
log("creating tree for " + m.fullName)
if (m.isMethod) {
if (info(m).target.isGetterOrSetter) hasSpecializedFields = true
if (m.isClassConstructor) {
val origParamss = parameters(info(m).target)
assert(origParamss.length == 1) // we are after uncurry
val vparams =
for ((tp, sym) <- m.info.paramTypes zip origParamss(0))
yield m.newValue(sym.pos, specializedName(sym, typeEnv(cls)))
.setInfo(tp)
.setFlag(sym.flags)
// param accessors for private members (the others are inherited from the generic class)
for (param <- vparams if cls.info.nonPrivateMember(param.name) == NoSymbol;
val acc = param.cloneSymbol(cls).setFlag(PARAMACCESSOR | PRIVATE)) {
cls.info.decls.enter(acc)
mbrs += ValDef(acc, EmptyTree).setType(NoType).setPos(m.pos)
}
// ctor
mbrs += atPos(m.pos)(DefDef(m, Modifiers(m.flags), List(vparams) map (_ map ValDef), EmptyTree))
} else {
mbrs += atPos(m.pos)(DefDef(m, { paramss => EmptyTree }))
}
} else if (m.isValue) {
mbrs += ValDef(m, EmptyTree).setType(NoType).setPos(m.pos)
} else if (m.isClass) {
// mbrs +=
// ClassDef(m, Template(m.info.parents map TypeTree, emptyValDef, List())
// .setSymbol(m.newLocalDummy(m.pos)))
// log("created synthetic class: " + m.fullName)
}
}
if (hasSpecializedFields) {
val sym = cls.newMethod(nme.SPECIALIZED_INSTANCE, cls.pos)
.setInfo(MethodType(Nil, definitions.BooleanClass.tpe))
cls.info.decls.enter(sym)
mbrs += atPos(sym.pos) {
DefDef(sym, Literal(cls.hasFlag(SPECIALIZED)).setType(sym.tpe.finalResultType)).setType(NoType)
}
}
mbrs.toList
}
/** Create specialized class definitions */
def implSpecClasses(trees: List[Tree]): List[Tree] = {
val buf = new mutable.ListBuffer[Tree]
for (tree <- trees)
tree match {
case ClassDef(_, _, _, impl) =>
tree.symbol.info // force specialization
for (((sym1, env), specCls) <- specializedClass if sym1 == tree.symbol) {
val parents = specCls.info.parents.map(TypeTree)
buf +=
ClassDef(specCls, atPos(impl.pos)(Template(parents, emptyValDef, List()))
.setSymbol(specCls.newLocalDummy(sym1.pos))) setPos tree.pos
log("created synthetic class: " + specCls + " of " + sym1 + " in env: " + env)
}
case _ =>
}
buf.toList
}
}
private def forwardCall(pos: util.Position, receiver: Tree, paramss: List[List[ValDef]]): Tree = {
val argss = paramss map (_ map (x => Ident(x.symbol)))
atPos(pos) { (receiver /: argss) (Apply) }
}
/** Concrete methods that use a specialized type, or override such methods. */
private val concreteSpecMethods: mutable.Set[Symbol] = new mutable.HashSet
/** Instantiate polymorphic function `target' with type parameters from `from'.
* For each type parameter `tp' in `target', its argument is:
* - a corresponding type parameter of `from', if tp is not bound in
* typeEnv(from)
* - the upper bound of tp, if the binding conflicts with tp's bounds
* - typeEnv(from)(tp), if the binding is not conflicting in its bounds
*/
private def makeTypeArguments(from: Symbol, target: Symbol): List[Type] = {
val owner = from.owner
val env = typeEnv(from)
for (tp <- owner.info.memberType(target).typeParams)
yield
if (!env.isDefinedAt(tp))
typeRef(NoPrefix, from.info.typeParams.find(_.name == tp.name).get, Nil)
else if ((env(tp) <:< tp.info.bounds.hi) && (tp.info.bounds.lo <:< env(tp)))
env(tp)
else tp.info.bounds.hi
}
private def makeArguments(fun: Symbol, vparams: List[Symbol]): List[Tree] = {
def needsCast(tp1: Type, tp2: Type): Boolean =
!(tp1 <:< tp2)
//! TODO: make sure the param types are seen from the right prefix
for ((tp, arg) <- fun.info.paramTypes zip vparams) yield {
if (needsCast(arg.tpe, tp)) {
//log("tp: " + tp + " " + tp.typeSymbol.owner)
gen.mkAsInstanceOf(Ident(arg), tp)
} else Ident(arg)
}
}
private def findSpec(tp: Type): Type = tp match {
case TypeRef(pre, sym, args) =>
if (args.isEmpty) tp
else {
specializedType(tp)
/*log("looking for " + specializedName(sym.name, args) + " in " + pre)
val sym1 = pre.member(specializedName(sym.name, args))
assert(sym1 != NoSymbol, "pre: " + pre.typeSymbol + " ph: " + phase + " with: " + pre.members)
TypeRef(pre, sym1, Nil)*/
}
case _ => tp
}
class SpecializationTransformer(unit: CompilationUnit) extends Transformer {
log("specializing " + unit)
override def transform(tree: Tree) =
atPhase(phase.next) {
val res = specializeCalls(unit).transform(tree)
res
}
}
}
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