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|
/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Martin Odersky
*/
// Added: Sat Oct 7 16:08:21 2006
//todo: use inherited type info also for vars and values
// Added: Thu Apr 12 18:23:58 2007
//todo: disallow C#D in superclass
//todo: treat :::= correctly
package scala.tools.nsc
package typechecker
import scala.collection.mutable
import scala.tools.nsc.util.BatchSourceFile
import mutable.ListBuffer
import symtab.Flags._
import util.Statistics
import util.Statistics._
// Suggestion check whether we can do without priming scopes with symbols of outer scopes,
// like the IDE does.
/** This trait provides methods to assign types to trees.
*
* @author Martin Odersky
* @version 1.0
*/
trait Typers extends Modes with Adaptations with Taggings {
self: Analyzer =>
import global._
import definitions._
import patmat.DefaultOverrideMatchAttachment
final def forArgMode(fun: Tree, mode: Int) =
if (treeInfo.isSelfOrSuperConstrCall(fun)) mode | SCCmode
else mode
// namer calls typer.computeType(rhs) on DefDef / ValDef when tpt is empty. the result
// is cached here and re-used in typedDefDef / typedValDef
// Also used to cache imports type-checked by namer.
val transformed = new mutable.HashMap[Tree, Tree]
final val shortenImports = false
def resetTyper() {
//println("resetTyper called")
resetContexts()
resetNamer()
resetImplicits()
transformed.clear()
}
// [Eugene] shouldn't this be converted to resetAllAttrs?
object UnTyper extends Traverser {
override def traverse(tree: Tree) = {
if (tree != EmptyTree) tree.tpe = null
if (tree.hasSymbol) tree.symbol = NoSymbol
super.traverse(tree)
}
}
/* needed for experimental version where early types can be type arguments
class EarlyMap(clazz: Symbol) extends TypeMap {
def apply(tp: Type): Type = tp match {
case TypeRef(NoPrefix, sym, List()) if (sym hasFlag PRESUPER) =>
TypeRef(ThisType(clazz), sym, List())
case _ =>
mapOver(tp)
}
}
*/
sealed abstract class SilentResult[+T]
case class SilentTypeError(err: AbsTypeError) extends SilentResult[Nothing] { }
case class SilentResultValue[+T](value: T) extends SilentResult[T] { }
def newTyper(context: Context): Typer = new NormalTyper(context)
private class NormalTyper(context : Context) extends Typer(context)
// A transient flag to mark members of anonymous classes
// that are turned private by typedBlock
private final val SYNTHETIC_PRIVATE = TRANS_FLAG
private def isPastTyper = phase.id > currentRun.typerPhase.id
// To enable decent error messages when the typer crashes.
// TODO - this only catches trees which go through def typed,
// but there are all kinds of back ways - typedClassDef, etc. etc.
// Funnel everything through one doorway.
var lastTreeToTyper: Tree = EmptyTree
// when true:
// - we may virtualize matches (if -Xexperimental and there's a suitable __match in scope)
// - we synthesize PartialFunction implementations for `x => x match {...}` and `match {...}` when the expected type is PartialFunction
// this is disabled by: -Xoldpatmat, scaladoc or interactive compilation
@inline private def newPatternMatching = opt.virtPatmat && !forScaladoc && !forInteractive // && (phase.id < currentRun.uncurryPhase.id)
abstract class Typer(context0: Context) extends TyperDiagnostics with Adaptation with Tagging with TyperContextErrors {
import context0.unit
import typeDebug.{ ptTree, ptBlock, ptLine }
import TyperErrorGen._
val infer = new Inferencer(context0) {
override def isCoercible(tp: Type, pt: Type): Boolean = undoLog undo { // #3281
tp.isError || pt.isError ||
context0.implicitsEnabled && // this condition prevents chains of views
inferView(EmptyTree, tp, pt, false) != EmptyTree
}}
/** Find implicit arguments and pass them to given tree.
*/
def applyImplicitArgs(fun: Tree): Tree = fun.tpe match {
case MethodType(params, _) =>
val argResultsBuff = new ListBuffer[SearchResult]()
val argBuff = new ListBuffer[Tree]()
// paramFailed cannot be initialized with params.exists(_.tpe.isError) because that would
// hide some valid errors for params preceding the erroneous one.
var paramFailed = false
def mkPositionalArg(argTree: Tree, paramName: Name) = argTree
def mkNamedArg(argTree: Tree, paramName: Name) = atPos(argTree.pos)(new AssignOrNamedArg(Ident(paramName), (argTree)))
var mkArg: (Tree, Name) => Tree = mkPositionalArg
// DEPMETTODO: instantiate type vars that depend on earlier implicit args (see adapt (4.1))
//
// apply the substitutions (undet type param -> type) that were determined
// by implicit resolution of implicit arguments on the left of this argument
for(param <- params) {
var paramTp = param.tpe
for(ar <- argResultsBuff)
paramTp = paramTp.subst(ar.subst.from, ar.subst.to)
val res = if (paramFailed || (paramTp.isError && {paramFailed = true; true})) SearchFailure else inferImplicit(fun, paramTp, context.reportErrors, false, context)
argResultsBuff += res
if (res != SearchFailure) {
argBuff += mkArg(res.tree, param.name)
} else {
mkArg = mkNamedArg // don't pass the default argument (if any) here, but start emitting named arguments for the following args
if (!param.hasDefault && !paramFailed) {
context.errBuffer.find(_.kind == ErrorKinds.Divergent) match {
case Some(divergentImplicit) =>
// DivergentImplicit error has higher priority than "no implicit found"
// no need to issue the problem again if we are still in silent mode
if (context.reportErrors) {
context.issue(divergentImplicit)
context.condBufferFlush(_.kind == ErrorKinds.Divergent)
}
case None =>
NoImplicitFoundError(fun, param)
}
paramFailed = true
}
/* else {
TODO: alternative (to expose implicit search failure more) -->
resolve argument, do type inference, keep emitting positional args, infer type params based on default value for arg
for (ar <- argResultsBuff) ar.subst traverse defaultVal
val targs = exprTypeArgs(context.undetparams, defaultVal.tpe, paramTp)
substExpr(tree, tparams, targs, pt)
}*/
}
}
val args = argBuff.toList
for (ar <- argResultsBuff) {
ar.subst traverse fun
for (arg <- args) ar.subst traverse arg
}
new ApplyToImplicitArgs(fun, args) setPos fun.pos
case ErrorType =>
fun
}
def inferView(tree: Tree, from: Type, to: Type, reportAmbiguous: Boolean): Tree =
inferView(tree, from, to, reportAmbiguous, true)
/** Infer an implicit conversion (``view'') between two types.
* @param tree The tree which needs to be converted.
* @param from The source type of the conversion
* @param to The target type of the conversion
* @param reportAmbiguous Should ambiguous implicit errors be reported?
* False iff we search for a view to find out
* whether one type is coercible to another.
* @param saveErrors Should ambiguous and divergent implicit errors that were buffered
* during the inference of a view be put into the original buffer.
* False iff we don't care about them.
*/
def inferView(tree: Tree, from: Type, to: Type, reportAmbiguous: Boolean, saveErrors: Boolean): Tree = {
debuglog("infer view from "+from+" to "+to)//debug
if (isPastTyper) EmptyTree
else from match {
case MethodType(_, _) => EmptyTree
case OverloadedType(_, _) => EmptyTree
case PolyType(_, _) => EmptyTree
case _ =>
def wrapImplicit(from: Type): Tree = {
val result = inferImplicit(tree, functionType(List(from), to), reportAmbiguous, true, context, saveErrors)
if (result.subst != EmptyTreeTypeSubstituter) {
result.subst traverse tree
notifyUndetparamsInferred(result.subst.from, result.subst.to)
}
result.tree
}
val result = wrapImplicit(from)
if (result != EmptyTree) result
else wrapImplicit(byNameType(from))
}
}
import infer._
private var namerCache: Namer = null
def namer = {
if ((namerCache eq null) || namerCache.context != context)
namerCache = newNamer(context)
namerCache
}
var context = context0
def context1 = context
def dropExistential(tp: Type): Type = tp match {
case ExistentialType(tparams, tpe) =>
new SubstWildcardMap(tparams).apply(tp)
case TypeRef(_, sym, _) if sym.isAliasType =>
val tp0 = tp.normalize
val tp1 = dropExistential(tp0)
if (tp1 eq tp0) tp else tp1
case _ => tp
}
/** Check that <code>tree</code> is a stable expression.
*
* @param tree ...
* @return ...
*/
def checkStable(tree: Tree): Tree =
if (treeInfo.isExprSafeToInline(tree)) tree
else if (tree.isErrorTyped) tree
else UnstableTreeError(tree)
/** Would tree be a stable (i.e. a pure expression) if the type
* of its symbol was not volatile?
*/
protected def isStableExceptVolatile(tree: Tree) = {
tree.hasSymbol && tree.symbol != NoSymbol && tree.tpe.isVolatile &&
{ val savedTpe = tree.symbol.info
val savedSTABLE = tree.symbol getFlag STABLE
tree.symbol setInfo AnyRefClass.tpe
tree.symbol setFlag STABLE
val result = treeInfo.isExprSafeToInline(tree)
tree.symbol setInfo savedTpe
tree.symbol setFlag savedSTABLE
result
}
}
def isNonRefinementClassType(tpe: Type) = tpe match {
case SingleType(_, sym) => sym.isModuleClass
case TypeRef(_, sym, _) => sym.isClass && !sym.isRefinementClass
case ErrorType => true
case _ => false
}
private def errorNotClass(tpt: Tree, found: Type) = { ClassTypeRequiredError(tpt, found); false }
private def errorNotStable(tpt: Tree, found: Type) = { TypeNotAStablePrefixError(tpt, found); false }
/** Check that `tpt` refers to a non-refinement class type */
def checkClassType(tpt: Tree): Boolean = {
val tpe = unwrapToClass(tpt.tpe)
isNonRefinementClassType(tpe) || errorNotClass(tpt, tpe)
}
/** Check that `tpt` refers to a class type with a stable prefix. */
def checkStablePrefixClassType(tpt: Tree): Boolean = {
val tpe = unwrapToStableClass(tpt.tpe)
def prefixIsStable = {
def checkPre = tpe match {
case TypeRef(pre, _, _) => pre.isStable || errorNotStable(tpt, pre)
case _ => false
}
// A type projection like X#Y can get by the stable check if the
// prefix is singleton-bounded, so peek at the tree too.
def checkTree = tpt match {
case SelectFromTypeTree(qual, _) => isSingleType(qual.tpe) || errorNotClass(tpt, tpe)
case _ => true
}
checkPre && checkTree
}
( (isNonRefinementClassType(tpe) || errorNotClass(tpt, tpe))
&& (isPastTyper || prefixIsStable)
)
}
/** Check that type <code>tp</code> is not a subtype of itself.
*
* @param pos ...
* @param tp ...
* @return <code>true</code> if <code>tp</code> is not a subtype of itself.
*/
def checkNonCyclic(pos: Position, tp: Type): Boolean = {
def checkNotLocked(sym: Symbol) = {
sym.initialize
sym.lockOK || { CyclicAliasingOrSubtypingError(pos, sym); false }
}
tp match {
case TypeRef(pre, sym, args) =>
checkNotLocked(sym) &&
((!sym.isNonClassType) || checkNonCyclic(pos, appliedType(pre.memberInfo(sym), args), sym))
// @M! info for a type ref to a type parameter now returns a polytype
// @M was: checkNonCyclic(pos, pre.memberInfo(sym).subst(sym.typeParams, args), sym)
case SingleType(pre, sym) =>
checkNotLocked(sym)
/*
case TypeBounds(lo, hi) =>
var ok = true
for (t <- lo) ok = ok & checkNonCyclic(pos, t)
ok
*/
case st: SubType =>
checkNonCyclic(pos, st.supertype)
case ct: CompoundType =>
ct.parents forall (x => checkNonCyclic(pos, x))
case _ =>
true
}
}
def checkNonCyclic(pos: Position, tp: Type, lockedSym: Symbol): Boolean = try {
if (!lockedSym.lock(CyclicReferenceError(pos, lockedSym))) false
else checkNonCyclic(pos, tp)
} finally {
lockedSym.unlock()
}
def checkNonCyclic(sym: Symbol) {
if (!checkNonCyclic(sym.pos, sym.tpe)) sym.setInfo(ErrorType)
}
def checkNonCyclic(defn: Tree, tpt: Tree) {
if (!checkNonCyclic(defn.pos, tpt.tpe, defn.symbol)) {
tpt.tpe = ErrorType
defn.symbol.setInfo(ErrorType)
}
}
def checkParamsConvertible(tree: Tree, tpe0: Type) {
def checkParamsConvertible0(tpe: Type) =
tpe match {
case MethodType(formals, restpe) =>
/*
if (formals.exists(_.typeSymbol == ByNameParamClass) && formals.length != 1)
error(pos, "methods with `=>`-parameter can be converted to function values only if they take no other parameters")
if (formals exists (isRepeatedParamType(_)))
error(pos, "methods with `*`-parameters cannot be converted to function values");
*/
if (restpe.isDependent)
DependentMethodTpeConversionToFunctionError(tree, tpe)
checkParamsConvertible(tree, restpe)
case _ =>
}
checkParamsConvertible0(tpe0)
}
/** Check that type of given tree does not contain local or private
* components.
*/
object checkNoEscaping extends TypeMap {
private var owner: Symbol = _
private var scope: Scope = _
private var hiddenSymbols: List[Symbol] = _
/** Check that type <code>tree</code> does not refer to private
* components unless itself is wrapped in something private
* (<code>owner</code> tells where the type occurs).
*
* @param owner ...
* @param tree ...
* @return ...
*/
def privates[T <: Tree](owner: Symbol, tree: T): T =
check(owner, EmptyScope, WildcardType, tree)
/** Check that type <code>tree</code> does not refer to entities
* defined in scope <code>scope</code>.
*
* @param scope ...
* @param pt ...
* @param tree ...
* @return ...
*/
def locals[T <: Tree](scope: Scope, pt: Type, tree: T): T =
check(NoSymbol, scope, pt, tree)
private def check[T <: Tree](owner: Symbol, scope: Scope, pt: Type, tree: T): T = {
this.owner = owner
this.scope = scope
hiddenSymbols = List()
val tp1 = apply(tree.tpe)
if (hiddenSymbols.isEmpty) tree setType tp1
else if (hiddenSymbols exists (_.isErroneous)) HiddenSymbolWithError(tree)
else if (isFullyDefined(pt)) tree setType pt
else if (tp1.typeSymbol.isAnonymousClass)
check(owner, scope, pt, tree setType tp1.typeSymbol.classBound)
else if (owner == NoSymbol)
tree setType packSymbols(hiddenSymbols.reverse, tp1)
else if (!phase.erasedTypes) { // privates
val badSymbol = hiddenSymbols.head
SymbolEscapesScopeError(tree, badSymbol)
} else tree
}
def addHidden(sym: Symbol) =
if (!(hiddenSymbols contains sym)) hiddenSymbols = sym :: hiddenSymbols
override def apply(t: Type): Type = {
def checkNoEscape(sym: Symbol) {
if (sym.isPrivate && !sym.hasFlag(SYNTHETIC_PRIVATE)) {
var o = owner
while (o != NoSymbol && o != sym.owner && o != sym.owner.linkedClassOfClass &&
!o.isLocal && !o.isPrivate &&
!o.privateWithin.hasTransOwner(sym.owner))
o = o.owner
if (o == sym.owner || o == sym.owner.linkedClassOfClass)
addHidden(sym)
} else if (sym.owner.isTerm && !sym.isTypeParameterOrSkolem) {
var e = scope.lookupEntry(sym.name)
var found = false
while (!found && (e ne null) && e.owner == scope) {
if (e.sym == sym) {
found = true
addHidden(sym)
} else {
e = scope.lookupNextEntry(e)
}
}
}
}
mapOver(
t match {
case TypeRef(_, sym, args) =>
checkNoEscape(sym)
if (!hiddenSymbols.isEmpty && hiddenSymbols.head == sym &&
sym.isAliasType && sameLength(sym.typeParams, args)) {
hiddenSymbols = hiddenSymbols.tail
t.normalize
} else t
case SingleType(_, sym) =>
checkNoEscape(sym)
t
case _ =>
t
})
}
}
def reenterValueParams(vparamss: List[List[ValDef]]) {
for (vparams <- vparamss)
for (vparam <- vparams)
vparam.symbol = context.scope enter vparam.symbol
}
def reenterTypeParams(tparams: List[TypeDef]): List[Symbol] =
for (tparam <- tparams) yield {
tparam.symbol = context.scope enter tparam.symbol
tparam.symbol.deSkolemize
}
/** The qualifying class
* of a this or super with prefix <code>qual</code>.
* packageOk is equal false when qualifying class symbol
*/
def qualifyingClass(tree: Tree, qual: Name, packageOK: Boolean) =
context.enclClass.owner.ownerChain.find(o => qual.isEmpty || o.isClass && o.name == qual) match {
case Some(c) if packageOK || !c.isPackageClass => c
case _ => QualifyingClassError(tree, qual) ; NoSymbol
}
/** The typer for an expression, depending on where we are. If we are before a superclass
* call, this is a typer over a constructor context; otherwise it is the current typer.
*/
@inline
final def constrTyperIf(inConstr: Boolean): Typer =
if (inConstr) {
assert(context.undetparams.isEmpty, context.undetparams)
newTyper(context.makeConstructorContext)
} else this
@inline
final def withCondConstrTyper[T](inConstr: Boolean)(f: Typer => T): T =
if (inConstr) {
assert(context.undetparams.isEmpty, context.undetparams)
val c = context.makeConstructorContext
typerWithLocalContext(c)(f)
} else {
f(this)
}
@inline
final def typerWithCondLocalContext[T](c: => Context)(cond: Boolean)(f: Typer => T): T =
if (cond) typerWithLocalContext(c)(f) else f(this)
@inline
final def typerWithLocalContext[T](c: Context)(f: Typer => T): T = {
val res = f(newTyper(c))
if (c.hasErrors)
context.updateBuffer(c.flushAndReturnBuffer())
res
}
@inline
final def typerReportAnyContextErrors[T](c: Context)(f: Typer => T): T = {
val res = f(newTyper(c))
if (c.hasErrors)
context.issue(c.errBuffer.head)
res
}
@inline
final def withSavedContext[T](c: Context)(f: => T) = {
val savedErrors = c.flushAndReturnBuffer()
val res = f
c.updateBuffer(savedErrors)
res
}
/** The typer for a label definition. If this is part of a template we
* first have to enter the label definition.
*/
def labelTyper(ldef: LabelDef): Typer =
if (ldef.symbol == NoSymbol) { // labeldef is part of template
val typer1 = newTyper(context.makeNewScope(ldef, context.owner))
typer1.enterLabelDef(ldef)
typer1
} else this
final val xtypes = false
/** Is symbol defined and not stale?
*/
def reallyExists(sym: Symbol) = {
if (isStale(sym)) sym.setInfo(NoType)
sym.exists
}
/** A symbol is stale if it is toplevel, to be loaded from a classfile, and
* the classfile is produced from a sourcefile which is compiled in the current run.
*/
def isStale(sym: Symbol): Boolean = {
sym.rawInfo.isInstanceOf[loaders.ClassfileLoader] && {
sym.rawInfo.load(sym)
(sym.sourceFile ne null) &&
(currentRun.compiledFiles contains sym.sourceFile.path)
}
}
/** Does the context of tree <code>tree</code> require a stable type?
*/
private def isStableContext(tree: Tree, mode: Int, pt: Type) =
isNarrowable(tree.tpe) && ((mode & (EXPRmode | LHSmode)) == EXPRmode) &&
(xtypes ||
(pt.isStable ||
(mode & QUALmode) != 0 && !tree.symbol.isConstant ||
pt.typeSymbol.isAbstractType && pt.bounds.lo.isStable && !(tree.tpe <:< pt)) ||
pt.typeSymbol.isRefinementClass && !(tree.tpe <:< pt))
/** Make symbol accessible. This means:
* If symbol refers to package object, insert `.package` as second to last selector.
* (exception for some symbols in scala package which are dealiased immediately)
* Call checkAccessible, which sets tree's attributes.
* Also note that checkAccessible looks up sym on pre without checking that pre is well-formed
* (illegal type applications in pre will be skipped -- that's why typedSelect wraps the resulting tree in a TreeWithDeferredChecks)
* @return modified tree and new prefix type
*/
private def makeAccessible(tree: Tree, sym: Symbol, pre: Type, site: Tree): (Tree, Type) =
if (isInPackageObject(sym, pre.typeSymbol)) {
if (pre.typeSymbol == ScalaPackageClass && sym.isTerm) {
// short cut some aliases. It seems pattern matching needs this
// to notice exhaustiveness and to generate good code when
// List extractors are mixed with :: patterns. See Test5 in lists.scala.
def dealias(sym: Symbol) =
(atPos(tree.pos) {gen.mkAttributedRef(sym)}, sym.owner.thisType)
sym.name match {
case nme.List => return dealias(ListModule)
case nme.Seq => return dealias(SeqModule)
case nme.Nil => return dealias(NilModule)
case _ =>
}
}
val qual = typedQualifier { atPos(tree.pos.makeTransparent) {
tree match {
case Ident(_) => Ident(nme.PACKAGEkw)
case Select(qual, _) => Select(qual, nme.PACKAGEkw)
case SelectFromTypeTree(qual, _) => Select(qual, nme.PACKAGEkw)
}
}}
val tree1 = atPos(tree.pos) {
tree match {
case Ident(name) => Select(qual, name)
case Select(_, name) => Select(qual, name)
case SelectFromTypeTree(_, name) => SelectFromTypeTree(qual, name)
}
}
(checkAccessible(tree1, sym, qual.tpe, qual), qual.tpe)
} else {
(checkAccessible(tree, sym, pre, site), pre)
}
/** Is `sym` defined in package object of package `pkg`?
*/
private def isInPackageObject(sym: Symbol, pkg: Symbol) =
pkg.isPackageClass && {
sym.alternatives forall { sym =>
!sym.owner.isPackage && {
sym.owner.isPackageObjectClass &&
sym.owner.owner == pkg ||
pkg.isInitialized && {
// need to be careful here to not get a cyclic reference during bootstrap
val pkgobj = pkg.info.member(nme.PACKAGEkw)
pkgobj.isInitialized &&
(pkgobj.info.member(sym.name).alternatives contains sym)
}
}
}
}
/** Post-process an identifier or selection node, performing the following:
* 1. Check that non-function pattern expressions are stable
* 2. Check that packages and static modules are not used as values
* 3. Turn tree type into stable type if possible and required by context.
* 4. Give getClass calls a more precise type based on the type of the target of the call.
*/
private def stabilize(tree: Tree, pre: Type, mode: Int, pt: Type): Tree = {
if (tree.symbol.isOverloaded && !inFunMode(mode))
inferExprAlternative(tree, pt)
val sym = tree.symbol
def fail() = NotAValueError(tree, sym)
if (tree.isErrorTyped) tree
else if ((mode & (PATTERNmode | FUNmode)) == PATTERNmode && tree.isTerm) { // (1)
if (sym.isValue) {
val tree1 = checkStable(tree)
// A module reference in a pattern has type Foo.type, not "object Foo"
if (sym.isModule && !sym.isMethod) tree1 setType singleType(pre, sym)
else tree1
}
else fail()
} else if ((mode & (EXPRmode | QUALmode)) == EXPRmode && !sym.isValue && !phase.erasedTypes) { // (2)
fail()
} else {
if (sym.isStable && pre.isStable && !isByNameParamType(tree.tpe) &&
(isStableContext(tree, mode, pt) || sym.isModule && !sym.isMethod))
tree.setType(singleType(pre, sym))
// To fully benefit from special casing the return type of
// getClass, we have to catch it immediately so expressions
// like x.getClass().newInstance() are typed with the type of x.
else if ( tree.symbol.name == nme.getClass_
&& tree.tpe.params.isEmpty
// TODO: If the type of the qualifier is inaccessible, we can cause private types
// to escape scope here, e.g. pos/t1107. I'm not sure how to properly handle this
// so for now it requires the type symbol be public.
&& pre.typeSymbol.isPublic)
tree setType MethodType(Nil, getClassReturnType(pre))
else
tree
}
}
private def isNarrowable(tpe: Type): Boolean = unwrapWrapperTypes(tpe) match {
case TypeRef(_, _, _) | RefinedType(_, _) => true
case _ => !phase.erasedTypes
}
/**
* @param tree ...
* @param mode ...
* @param pt ...
* @return ...
*/
def stabilizeFun(tree: Tree, mode: Int, pt: Type): Tree = {
val sym = tree.symbol
val pre = tree match {
case Select(qual, _) => qual.tpe
case _ => NoPrefix
}
if (tree.tpe.isInstanceOf[MethodType] && pre.isStable && sym.tpe.params.isEmpty &&
(isStableContext(tree, mode, pt) || sym.isModule))
tree.setType(MethodType(List(), singleType(pre, sym))) // TODO: should this be a NullaryMethodType?
else tree
}
/** The member with given name of given qualifier tree */
def member(qual: Tree, name: Name) = {
def callSiteWithinClass(clazz: Symbol) = context.enclClass.owner hasTransOwner clazz
val includeLocals = qual.tpe match {
case ThisType(clazz) if callSiteWithinClass(clazz) => true
case SuperType(clazz, _) if callSiteWithinClass(clazz.typeSymbol) => true
case _ => phase.next.erasedTypes
}
if (includeLocals) qual.tpe member name
else qual.tpe nonLocalMember name
}
def silent[T](op: Typer => T,
reportAmbiguousErrors: Boolean = context.ambiguousErrors,
newtree: Tree = context.tree): SilentResult[T] = {
val rawTypeStart = startCounter(rawTypeFailed)
val findMemberStart = startCounter(findMemberFailed)
val subtypeStart = startCounter(subtypeFailed)
val failedSilentStart = startTimer(failedSilentNanos)
try {
if (context.reportErrors ||
reportAmbiguousErrors != context.ambiguousErrors ||
newtree != context.tree) {
val context1 = context.makeSilent(reportAmbiguousErrors, newtree)
context1.undetparams = context.undetparams
context1.savedTypeBounds = context.savedTypeBounds
context1.namedApplyBlockInfo = context.namedApplyBlockInfo
val typer1 = newTyper(context1)
val result = op(typer1)
context.undetparams = context1.undetparams
context.savedTypeBounds = context1.savedTypeBounds
context.namedApplyBlockInfo = context1.namedApplyBlockInfo
if (context1.hasErrors) SilentTypeError(context1.errBuffer.head)
else SilentResultValue(result)
} else {
assert(context.bufferErrors || isPastTyper, "silent mode is not available past typer")
withSavedContext(context){
val res = op(this)
val errorsToReport = context.flushAndReturnBuffer()
if (errorsToReport.isEmpty) SilentResultValue(res) else SilentTypeError(errorsToReport.head)
}
}
} catch {
case ex: CyclicReference => throw ex
case ex: TypeError =>
// fallback in case TypeError is still thrown
// @H this happens for example in cps annotation checker
stopCounter(rawTypeFailed, rawTypeStart)
stopCounter(findMemberFailed, findMemberStart)
stopCounter(subtypeFailed, subtypeStart)
stopTimer(failedSilentNanos, failedSilentStart)
SilentTypeError(TypeErrorWrapper(ex))
}
}
/** Check whether feature given by `featureTrait` is enabled.
* If it is not, issue an error or a warning depending on whether the feature is required.
* @param construct A string expression that is substituted for "#" in the feature description string
* @param immediate When set, feature check is run immediately, otherwise it is run
* at the end of the typechecking run for the enclosing unit. This
* is done to avoid potential cyclic reference errors by implicits
* that are forced too early.
* @return if feature check is run immediately: true if feature is enabled, false otherwise
* if feature check is delayed or suppressed because we are past typer: true
*/
def checkFeature(pos: Position, featureTrait: Symbol, construct: => String = "", immediate: Boolean = false): Boolean =
if (isPastTyper) true
else {
val nestedOwners =
featureTrait.owner.ownerChain.takeWhile(_ != languageFeatureModule.moduleClass).reverse
val featureName = (nestedOwners map (_.name + ".")).mkString + featureTrait.name
def action(): Boolean = {
def hasImport = inferImplicit(EmptyTree: Tree, featureTrait.tpe, true, false, context) != SearchFailure
def hasOption = settings.language.value contains featureName
val OK = hasImport || hasOption
if (!OK) {
val Some(AnnotationInfo(_, List(Literal(Constant(featureDesc: String)), Literal(Constant(required: Boolean))), _)) =
featureTrait getAnnotation LanguageFeatureAnnot
val req = if (required) "needs to" else "should"
var raw = featureDesc + " " + req + " be enabled\n" +
"by making the implicit value language." + featureName + " visible."
if (!(currentRun.reportedFeature contains featureTrait))
raw += "\nThis can be achieved by adding the import clause 'import language." + featureName + "'\n" +
"or by setting the compiler option -language:" + featureName + ".\n" +
"See the Scala docs for value scala.language." + featureName + " for a discussion\n" +
"why the feature " + req + " be explicitly enabled."
currentRun.reportedFeature += featureTrait
val msg = raw replace ("#", construct)
if (required) unit.error(pos, msg)
else currentRun.featureWarnings.warn(pos, msg)
}
OK
}
if (immediate) {
action()
} else {
unit.toCheck += action
true
}
}
def checkExistentialsFeature(pos: Position, tpe: Type, prefix: String) = tpe match {
case extp: ExistentialType if !extp.isRepresentableWithWildcards =>
checkFeature(pos, ExistentialsFeature, prefix+" "+tpe)
case _ =>
}
/** Perform the following adaptations of expression, pattern or type `tree` wrt to
* given mode `mode` and given prototype `pt`:
* (-1) For expressions with annotated types, let AnnotationCheckers decide what to do
* (0) Convert expressions with constant types to literals (unless in interactive/scaladoc mode)
* (1) Resolve overloading, unless mode contains FUNmode
* (2) Apply parameterless functions
* (3) Apply polymorphic types to fresh instances of their type parameters and
* store these instances in context.undetparams,
* unless followed by explicit type application.
* (4) Do the following to unapplied methods used as values:
* (4.1) If the method has only implicit parameters pass implicit arguments
* (4.2) otherwise, if `pt` is a function type and method is not a constructor,
* convert to function by eta-expansion,
* (4.3) otherwise, if the method is nullary with a result type compatible to `pt`
* and it is not a constructor, apply it to ()
* otherwise issue an error
* (5) Convert constructors in a pattern as follows:
* (5.1) If constructor refers to a case class factory, set tree's type to the unique
* instance of its primary constructor that is a subtype of the expected type.
* (5.2) If constructor refers to an extractor, convert to application of
* unapply or unapplySeq method.
*
* (6) Convert all other types to TypeTree nodes.
* (7) When in TYPEmode but not FUNmode or HKmode, check that types are fully parameterized
* (7.1) In HKmode, higher-kinded types are allowed, but they must have the expected kind-arity
* (8) When in both EXPRmode and FUNmode, add apply method calls to values of object type.
* (9) If there are undetermined type variables and not POLYmode, infer expression instance
* Then, if tree's type is not a subtype of expected type, try the following adaptations:
* (10) If the expected type is Byte, Short or Char, and the expression
* is an integer fitting in the range of that type, convert it to that type.
* (11) Widen numeric literals to their expected type, if necessary
* (12) When in mode EXPRmode, convert E to { E; () } if expected type is scala.Unit.
* (13) When in mode EXPRmode, apply AnnotationChecker conversion if expected type is annotated.
* (14) When in mode EXPRmode, apply a view
* If all this fails, error
*/
protected def adapt(tree: Tree, mode: Int, pt: Type, original: Tree = EmptyTree): Tree = {
def adaptToImplicitMethod(mt: MethodType): Tree = {
if (context.undetparams.nonEmpty) { // (9) -- should revisit dropped condition `(mode & POLYmode) == 0`
// dropped so that type args of implicit method are inferred even if polymorphic expressions are allowed
// needed for implicits in 2.8 collection library -- maybe once #3346 is fixed, we can reinstate the condition?
context.undetparams = inferExprInstance(tree, context.extractUndetparams(), pt,
// approximate types that depend on arguments since dependency on implicit argument is like dependency on type parameter
mt.approximate,
keepNothings = false,
useWeaklyCompatible = true) // #3808
}
// avoid throwing spurious DivergentImplicit errors
if (context.hasErrors)
return setError(tree)
withCondConstrTyper(treeInfo.isSelfOrSuperConstrCall(tree)){ typer1 =>
if (original != EmptyTree && pt != WildcardType)
typer1.silent(tpr => {
val withImplicitArgs = tpr.applyImplicitArgs(tree)
if (tpr.context.hasErrors) tree // silent will wrap it in SilentTypeError anyway
else tpr.typed(withImplicitArgs, mode, pt)
}) match {
case SilentResultValue(result) =>
result
case _ =>
debuglog("fallback on implicits: " + tree + "/" + resetAllAttrs(original))
val tree1 = typed(resetAllAttrs(original), mode, WildcardType)
tree1.tpe = addAnnotations(tree1, tree1.tpe)
if (tree1.isEmpty) tree1 else adapt(tree1, mode, pt, EmptyTree)
}
else
typer1.typed(typer1.applyImplicitArgs(tree), mode, pt)
}
}
def instantiateToMethodType(mt: MethodType): Tree = {
val meth = tree match {
// a partial named application is a block (see comment in EtaExpansion)
case Block(_, tree1) => tree1.symbol
case _ => tree.symbol
}
if (!meth.isConstructor && !meth.isTermMacro && isFunctionType(pt)) { // (4.2)
debuglog("eta-expanding " + tree + ":" + tree.tpe + " to " + pt)
checkParamsConvertible(tree, tree.tpe)
val tree0 = etaExpand(context.unit, tree)
// println("eta "+tree+" ---> "+tree0+":"+tree0.tpe+" undet: "+context.undetparams+ " mode: "+Integer.toHexString(mode))
if (context.undetparams.nonEmpty) {
// #2624: need to infer type arguments for eta expansion of a polymorphic method
// context.undetparams contains clones of meth.typeParams (fresh ones were generated in etaExpand)
// need to run typer on tree0, since etaExpansion sets the tpe's of its subtrees to null
// can't type with the expected type, as we can't recreate the setup in (3) without calling typed
// (note that (3) does not call typed to do the polymorphic type instantiation --
// it is called after the tree has been typed with a polymorphic expected result type)
instantiate(typed(tree0, mode, WildcardType), mode, pt)
} else
typed(tree0, mode, pt)
} else if (!meth.isConstructor && mt.params.isEmpty) { // (4.3)
adapt(typed(Apply(tree, List()) setPos tree.pos), mode, pt, original)
} else if (context.implicitsEnabled) {
MissingArgsForMethodTpeError(tree, meth)
} else {
setError(tree)
}
}
def adaptType(): Tree = {
if (inFunMode(mode)) {
// [Eugene++] the commented line below makes sense for typechecking, say, TypeApply(Ident(`some abstract type symbol`), List(...))
// because otherwise Ident will have its tpe set to a TypeRef, not to a PolyType, and `typedTypeApply` will fail
// but this needs additional investigation, because it crashes t5228, gadts1 and maybe something else
// tree setType tree.tpe.normalize
tree
} else if (tree.hasSymbol && !tree.symbol.typeParams.isEmpty && !inHKMode(mode) &&
!(tree.symbol.isJavaDefined && context.unit.isJava)) { // (7)
// @M When not typing a higher-kinded type ((mode & HKmode) == 0)
// or raw type (tree.symbol.isJavaDefined && context.unit.isJava), types must be of kind *,
// and thus parameterized types must be applied to their type arguments
// @M TODO: why do kind-* tree's have symbols, while higher-kinded ones don't?
MissingTypeParametersError(tree)
} else if ( // (7.1) @M: check kind-arity
// @M: removed check for tree.hasSymbol and replace tree.symbol by tree.tpe.symbol (TypeTree's must also be checked here, and they don't directly have a symbol)
(inHKMode(mode)) &&
// @M: don't check tree.tpe.symbol.typeParams. check tree.tpe.typeParams!!!
// (e.g., m[Int] --> tree.tpe.symbol.typeParams.length == 1, tree.tpe.typeParams.length == 0!)
!sameLength(tree.tpe.typeParams, pt.typeParams) &&
!(tree.tpe.typeSymbol == AnyClass ||
tree.tpe.typeSymbol == NothingClass ||
pt == WildcardType)) {
// Check that the actual kind arity (tree.symbol.typeParams.length) conforms to the expected
// kind-arity (pt.typeParams.length). Full checks are done in checkKindBounds in Infer.
// Note that we treat Any and Nothing as kind-polymorphic.
// We can't perform this check when typing type arguments to an overloaded method before the overload is resolved
// (or in the case of an error type) -- this is indicated by pt == WildcardType (see case TypeApply in typed1).
KindArityMismatchError(tree, pt)
} else tree match { // (6)
case TypeTree() => tree
case _ => TypeTree(tree.tpe) setOriginal tree
}
}
/**
* To deal with the type slack between actual (run-time) types and statically known types, for each abstract type T,
* reflect its variance as a skolem that is upper-bounded by T (covariant position), or lower-bounded by T (contravariant).
*
* Consider the following example:
*
* class AbsWrapperCov[+A]
* case class Wrapper[B](x: Wrapped[B]) extends AbsWrapperCov[B]
*
* def unwrap[T](x: AbsWrapperCov[T]): Wrapped[T] = x match {
* case Wrapper(wrapped) => // Wrapper's type parameter must not be assumed to be equal to T, it's *upper-bounded* by it
* wrapped // : Wrapped[_ <: T]
* }
*
* this method should type check if and only if Wrapped is covariant in its type parameter
*
* when inferring Wrapper's type parameter B from x's type AbsWrapperCov[T],
* we must take into account that x's actual type is AbsWrapperCov[Tactual] forSome {type Tactual <: T}
* as AbsWrapperCov is covariant in A -- in other words, we must not assume we know T exactly, all we know is its upper bound
*
* since method application is the only way to generate this slack between run-time and compile-time types (TODO: right!?),
* we can simply replace skolems that represent method type parameters as seen from the method's body
* by other skolems that are (upper/lower)-bounded by that type-parameter skolem
* (depending on the variance position of the skolem in the statically assumed type of the scrutinee, pt)
*
* see test/files/../t5189*.scala
*/
def adaptConstrPattern(): Tree = { // (5)
def isExtractor(sym: Symbol) = reallyExists(unapplyMember(sym.tpe))
val extractor = tree.symbol filter isExtractor
if (extractor != NoSymbol) {
tree setSymbol extractor
tree.tpe match {
case OverloadedType(pre, alts) => tree.tpe = overloadedType(pre, alts filter isExtractor)
case _ =>
}
val unapply = unapplyMember(extractor.tpe)
val clazz = unapplyParameterType(unapply)
if (unapply.isCase && clazz.isCase && !(clazz.ancestors exists (_.isCase))) {
// convert synthetic unapply of case class to case class constructor
val prefix = tree.tpe.prefix
val tree1 = TypeTree(clazz.primaryConstructor.tpe.asSeenFrom(prefix, clazz.owner))
.setOriginal(tree)
val skolems = new mutable.ListBuffer[TypeSymbol]
object variantToSkolem extends VariantTypeMap {
def apply(tp: Type) = mapOver(tp) match {
case TypeRef(NoPrefix, tpSym, Nil) if variance != 0 && tpSym.isTypeParameterOrSkolem && tpSym.owner.isTerm =>
val bounds = if (variance == 1) TypeBounds.upper(tpSym.tpe) else TypeBounds.lower(tpSym.tpe)
// origin must be the type param so we can deskolemize
val skolem = context.owner.newGADTSkolem(unit.freshTypeName("?"+tpSym.name), tpSym, bounds)
// println("mapping "+ tpSym +" to "+ skolem + " : "+ bounds +" -- pt= "+ pt +" in "+ context.owner +" at "+ context.tree )
skolems += skolem
skolem.tpe
case tp1 => tp1
}
}
// have to open up the existential and put the skolems in scope
// can't simply package up pt in an ExistentialType, because that takes us back to square one (List[_ <: T] == List[T] due to covariance)
val ptSafe = variantToSkolem(pt) // TODO: pt.skolemizeExistential(context.owner, tree) ?
val freeVars = skolems.toList
// use "tree" for the context, not context.tree: don't make another CaseDef context,
// as instantiateTypeVar's bounds would end up there
val ctorContext = context.makeNewScope(tree, context.owner)
freeVars foreach ctorContext.scope.enter
newTyper(ctorContext).infer.inferConstructorInstance(tree1, clazz.typeParams, ptSafe)
// simplify types without losing safety,
// so that error messages don't unnecessarily refer to skolems
val extrapolate = new ExistentialExtrapolation(freeVars) extrapolate (_: Type)
val extrapolated = tree1.tpe match {
case MethodType(ctorArgs, res) => // ctorArgs are actually in a covariant position, since this is the type of the subpatterns of the pattern represented by this Apply node
ctorArgs foreach (p => p.info = extrapolate(p.info)) // no need to clone, this is OUR method type
copyMethodType(tree1.tpe, ctorArgs, extrapolate(res))
case tp => tp
}
// once the containing CaseDef has been type checked (see typedCase),
// tree1's remaining type-slack skolems will be deskolemized (to the method type parameter skolems)
tree1 setType extrapolated
} else {
tree
}
} else {
CaseClassConstructorError(tree)
}
}
def insertApply(): Tree = {
assert(!inHKMode(mode), modeString(mode)) //@M
val qual = adaptToName(tree, nme.apply) match {
case id @ Ident(_) =>
val pre = if (id.symbol.owner.isPackageClass) id.symbol.owner.thisType
else if (id.symbol.owner.isClass)
context.enclosingSubClassContext(id.symbol.owner).prefix
else NoPrefix
stabilize(id, pre, EXPRmode | QUALmode, WildcardType)
case sel @ Select(qualqual, _) =>
stabilize(sel, qualqual.tpe, EXPRmode | QUALmode, WildcardType)
case other =>
other
}
typed(atPos(tree.pos)(Select(qual, nme.apply)), mode, pt)
}
// begin adapt
tree.tpe match {
case atp @ AnnotatedType(_, _, _) if canAdaptAnnotations(tree, mode, pt) => // (-1)
adaptAnnotations(tree, mode, pt)
case ct @ ConstantType(value) if inNoModes(mode, TYPEmode | FUNmode) && (ct <:< pt) && !forScaladoc && !forInteractive => // (0)
val sym = tree.symbol
if (sym != null && sym.isDeprecated) {
val msg = sym.toString + sym.locationString + " is deprecated: " + sym.deprecationMessage.getOrElse("")
unit.deprecationWarning(tree.pos, msg)
}
treeCopy.Literal(tree, value)
case OverloadedType(pre, alts) if !inFunMode(mode) => // (1)
inferExprAlternative(tree, pt)
adapt(tree, mode, pt, original)
case NullaryMethodType(restpe) => // (2)
adapt(tree setType restpe, mode, pt, original)
case TypeRef(_, ByNameParamClass, List(arg)) if ((mode & EXPRmode) != 0) => // (2)
adapt(tree setType arg, mode, pt, original)
case tr @ TypeRef(_, sym, _) if sym.isAliasType && tr.normalize.isInstanceOf[ExistentialType] &&
((mode & (EXPRmode | LHSmode)) == EXPRmode) =>
adapt(tree setType tr.normalize.skolemizeExistential(context.owner, tree), mode, pt, original)
case et @ ExistentialType(_, _) if ((mode & (EXPRmode | LHSmode)) == EXPRmode) =>
adapt(tree setType et.skolemizeExistential(context.owner, tree), mode, pt, original)
case PolyType(tparams, restpe) if inNoModes(mode, TAPPmode | PATTERNmode | HKmode) => // (3)
// assert((mode & HKmode) == 0) //@M a PolyType in HKmode represents an anonymous type function,
// we're in HKmode since a higher-kinded type is expected --> hence, don't implicitly apply it to type params!
// ticket #2197 triggered turning the assert into a guard
// I guess this assert wasn't violated before because type aliases weren't expanded as eagerly
// (the only way to get a PolyType for an anonymous type function is by normalisation, which applies eta-expansion)
// -- are we sure we want to expand aliases this early?
// -- what caused this change in behaviour??
val tparams1 = cloneSymbols(tparams)
val tree1 = if (tree.isType) tree
else TypeApply(tree, tparams1 map (tparam =>
TypeTree(tparam.tpeHK) setPos tree.pos.focus)) setPos tree.pos
context.undetparams ++= tparams1
notifyUndetparamsAdded(tparams1)
adapt(tree1 setType restpe.substSym(tparams, tparams1), mode, pt, original)
case mt: MethodType if mt.isImplicit && ((mode & (EXPRmode | FUNmode | LHSmode)) == EXPRmode) => // (4.1)
adaptToImplicitMethod(mt)
case mt: MethodType if (((mode & (EXPRmode | FUNmode | LHSmode)) == EXPRmode) &&
(context.undetparams.isEmpty || inPolyMode(mode))) && !(tree.symbol != null && tree.symbol.isTermMacro) =>
instantiateToMethodType(mt)
case _ =>
def applyPossible = {
def applyMeth = member(adaptToName(tree, nme.apply), nme.apply)
if ((mode & TAPPmode) != 0)
tree.tpe.typeParams.isEmpty && applyMeth.filter(!_.tpe.typeParams.isEmpty) != NoSymbol
else
applyMeth.filter(_.tpe.paramSectionCount > 0) != NoSymbol
}
if (tree.isType)
adaptType()
else if (
inExprModeButNot(mode, FUNmode) && !tree.isDef && // typechecking application
tree.symbol != null && tree.symbol.isTermMacro) // of a macro
macroExpand(this, tree, mode, pt)
else if ((mode & (PATTERNmode | FUNmode)) == (PATTERNmode | FUNmode))
adaptConstrPattern()
else if (inAllModes(mode, EXPRmode | FUNmode) &&
!tree.tpe.isInstanceOf[MethodType] &&
!tree.tpe.isInstanceOf[OverloadedType] &&
applyPossible)
insertApply()
else if (!context.undetparams.isEmpty && !inPolyMode(mode)) { // (9)
assert(!inHKMode(mode), modeString(mode)) //@M
if (inExprModeButNot(mode, FUNmode) && pt.typeSymbol == UnitClass)
instantiateExpectingUnit(tree, mode)
else
instantiate(tree, mode, pt)
} else if (tree.tpe <:< pt) {
tree
} else {
if (inPatternMode(mode)) {
if ((tree.symbol ne null) && tree.symbol.isModule)
inferModulePattern(tree, pt)
if (isPopulated(tree.tpe, approximateAbstracts(pt)))
return tree
}
val tree1 = constfold(tree, pt) // (10) (11)
if (tree1.tpe <:< pt) adapt(tree1, mode, pt, original)
else {
if (inExprModeButNot(mode, FUNmode)) {
pt.normalize match {
case TypeRef(_, sym, _) =>
// note: was if (pt.typeSymbol == UnitClass) but this leads to a potentially
// infinite expansion if pt is constant type ()
if (sym == UnitClass && tree.tpe <:< AnyClass.tpe) { // (12)
if (settings.warnValueDiscard.value)
context.unit.warning(tree.pos, "discarded non-Unit value")
return typed(atPos(tree.pos)(Block(List(tree), Literal(Constant()))), mode, pt)
} else if (isNumericValueClass(sym) && isNumericSubType(tree.tpe, pt)) {
if (settings.warnNumericWiden.value)
context.unit.warning(tree.pos, "implicit numeric widening")
return typed(atPos(tree.pos)(Select(tree, "to" + sym.name)), mode, pt)
}
case AnnotatedType(_, _, _) if canAdaptAnnotations(tree, mode, pt) => // (13)
return typed(adaptAnnotations(tree, mode, pt), mode, pt)
case _ =>
}
if (!context.undetparams.isEmpty) {
return instantiate(tree, mode, pt)
}
if (context.implicitsEnabled && !pt.isError && !tree.isErrorTyped) {
// (14); the condition prevents chains of views
debuglog("inferring view from " + tree.tpe + " to " + pt)
val coercion = inferView(tree, tree.tpe, pt, true)
// convert forward views of delegate types into closures wrapped around
// the delegate's apply method (the "Invoke" method, which was translated into apply)
if (forMSIL && coercion != null && isCorrespondingDelegate(tree.tpe, pt)) {
val meth: Symbol = tree.tpe.member(nme.apply)
debuglog("replacing forward delegate view with: " + meth + ":" + meth.tpe)
return typed(Select(tree, meth), mode, pt)
}
if (coercion != EmptyTree) {
def msg = "inferred view from " + tree.tpe + " to " + pt + " = " + coercion + ":" + coercion.tpe
if (settings.logImplicitConv.value)
unit.echo(tree.pos, msg)
debuglog(msg)
val silentContext = context.makeImplicit(context.ambiguousErrors)
val res = newTyper(silentContext).typed(
new ApplyImplicitView(coercion, List(tree)) setPos tree.pos, mode, pt)
if (silentContext.hasErrors) context.issue(silentContext.errBuffer.head) else return res
}
}
}
if (settings.debug.value) {
log("error tree = " + tree)
if (settings.explaintypes.value) explainTypes(tree.tpe, pt)
}
val found = tree.tpe
val req = pt
if (!found.isErroneous && !req.isErroneous) {
if (!context.reportErrors && isPastTyper && req.skolemsExceptMethodTypeParams.nonEmpty) {
// Ignore type errors raised in later phases that are due to mismatching types with existential skolems
// We have lift crashing in 2.9 with an adapt failure in the pattern matcher.
// Here's my hypothsis why this happens. The pattern matcher defines a variable of type
//
// val x: T = expr
//
// where T is the type of expr, but T contains existential skolems ts.
// In that case, this value definition does not typecheck.
// The value definition
//
// val x: T forSome { ts } = expr
//
// would typecheck. Or one can simply leave out the type of the `val`:
//
// val x = expr
context.unit.warning(tree.pos, "recovering from existential Skolem type error in tree \n" + tree + "\nwith type " + tree.tpe + "\n expected type = " + pt + "\n context = " + context.tree)
adapt(tree, mode, deriveTypeWithWildcards(pt.skolemsExceptMethodTypeParams)(pt))
} else {
// create an actual error
AdaptTypeError(tree, found, req)
}
}
setError(tree)
}
}
}
}
def instantiate(tree: Tree, mode: Int, pt: Type): Tree = {
inferExprInstance(tree, context.extractUndetparams(), pt)
adapt(tree, mode, pt)
}
/** If the expected type is Unit: try instantiating type arguments
* with expected type Unit, but if that fails, try again with pt = WildcardType
* and discard the expression.
*/
def instantiateExpectingUnit(tree: Tree, mode: Int): Tree = {
val savedUndetparams = context.undetparams
silent(_.instantiate(tree, mode, UnitClass.tpe)) match {
case SilentResultValue(t) => t
case _ =>
context.undetparams = savedUndetparams
val valueDiscard = atPos(tree.pos)(Block(List(instantiate(tree, mode, WildcardType)), Literal(Constant())))
typed(valueDiscard, mode, UnitClass.tpe)
}
}
private def isAdaptableWithView(qual: Tree) = {
val qtpe = qual.tpe.widen
( !isPastTyper
&& qual.isTerm
&& !qual.isInstanceOf[Super]
&& ((qual.symbol eq null) || !qual.symbol.isTerm || qual.symbol.isValue)
&& !qtpe.isError
&& !qtpe.typeSymbol.isBottomClass
&& qtpe != WildcardType
&& !qual.isInstanceOf[ApplyImplicitView] // don't chain views
&& (context.implicitsEnabled || context.enrichmentEnabled)
// Elaborating `context.implicitsEnabled`:
// don't try to adapt a top-level type that's the subject of an implicit search
// this happens because, if isView, typedImplicit tries to apply the "current" implicit value to
// a value that needs to be coerced, so we check whether the implicit value has an `apply` method.
// (If we allow this, we get divergence, e.g., starting at `conforms` during ant quick.bin)
// Note: implicit arguments are still inferred (this kind of "chaining" is allowed)
)
}
def adaptToMember(qual: Tree, searchTemplate: Type, reportAmbiguous: Boolean = true, saveErrors: Boolean = true): Tree = {
if (isAdaptableWithView(qual)) {
qual.tpe.widen.normalize match {
case et: ExistentialType =>
qual setType et.skolemizeExistential(context.owner, qual) // open the existential
case _ =>
}
inferView(qual, qual.tpe, searchTemplate, reportAmbiguous, saveErrors) match {
case EmptyTree => qual
case coercion =>
if (settings.logImplicitConv.value)
unit.echo(qual.pos,
"applied implicit conversion from %s to %s = %s".format(
qual.tpe, searchTemplate, coercion.symbol.defString))
typedQualifier(atPos(qual.pos)(new ApplyImplicitView(coercion, List(qual))))
}
}
else qual
}
/** Try to apply an implicit conversion to `qual` to that it contains
* a method `name` which can be applied to arguments `args` with expected type `pt`.
* If `pt` is defined, there is a fallback to try again with pt = ?.
* This helps avoiding propagating result information too far and solves
* #1756.
* If no conversion is found, return `qual` unchanged.
*
*/
def adaptToArguments(qual: Tree, name: Name, args: List[Tree], pt: Type, reportAmbiguous: Boolean, saveErrors: Boolean): Tree = {
def doAdapt(restpe: Type) =
//util.trace("adaptToArgs "+qual+", name = "+name+", argtpes = "+(args map (_.tpe))+", pt = "+pt+" = ")
adaptToMember(qual, HasMethodMatching(name, args map (_.tpe), restpe), reportAmbiguous, saveErrors)
if (pt != WildcardType) {
silent(_ => doAdapt(pt)) match {
case SilentResultValue(result) if result != qual =>
result
case _ =>
debuglog("fallback on implicits in adaptToArguments: "+qual+" . "+name)
doAdapt(WildcardType)
}
} else
doAdapt(pt)
}
/** Try to apply an implicit conversion to `qual` so that it contains
* a method `name`. If that's ambiguous try taking arguments into
* account using `adaptToArguments`.
*/
def adaptToMemberWithArgs(tree: Tree, qual: Tree, name: Name, mode: Int, reportAmbiguous: Boolean, saveErrors: Boolean): Tree = {
def onError(reportError: => Tree): Tree = {
context.tree match {
case Apply(tree1, args) if (tree1 eq tree) && args.nonEmpty =>
silent(_.typedArgs(args, mode)) match {
case SilentResultValue(xs) =>
val args = xs.asInstanceOf[List[Tree]]
if (args exists (_.isErrorTyped))
reportError
else
adaptToArguments(qual, name, args, WildcardType, reportAmbiguous, saveErrors)
case _ =>
reportError
}
case _ =>
reportError
}
}
silent(_.adaptToMember(qual, HasMember(name), false)) match {
case SilentResultValue(res) => res
case SilentTypeError(err) => onError({if (reportAmbiguous) { context.issue(err) }; setError(tree)})
}
}
/** Try to apply an implicit conversion to `qual` to that it contains a
* member `name` of arbitrary type.
* If no conversion is found, return `qual` unchanged.
*/
def adaptToName(qual: Tree, name: Name) =
if (member(qual, name) != NoSymbol) qual
else adaptToMember(qual, HasMember(name))
private def typePrimaryConstrBody(clazz : Symbol, cbody: Tree, tparams: List[Symbol], enclTparams: List[Symbol], vparamss: List[List[ValDef]]): Tree = {
// XXX: see about using the class's symbol....
enclTparams foreach (sym => context.scope.enter(sym))
namer.enterValueParams(vparamss)
typed(cbody)
}
private def validateNoCaseAncestor(clazz: Symbol) = {
if (!phase.erasedTypes) {
for (ancestor <- clazz.ancestors find (_.isCase)) {
unit.error(clazz.pos, (
"case %s has case ancestor %s, but case-to-case inheritance is prohibited."+
" To overcome this limitation, use extractors to pattern match on non-leaf nodes."
).format(clazz, ancestor.fullName))
}
}
}
private def validateDerivedValueClass(clazz: Symbol, body: List[Tree]) = {
if (clazz.isTrait)
unit.error(clazz.pos, "only classes (not traits) are allowed to extend AnyVal")
if (!clazz.isStatic)
unit.error(clazz.pos, "value class may not be a "+
(if (clazz.owner.isTerm) "local class" else "member of another class"))
val constr = clazz.primaryConstructor
clazz.info.decls.toList.filter(acc => acc.isMethod && (acc hasFlag PARAMACCESSOR)) match {
case List(acc) =>
def isUnderlyingAcc(sym: Symbol) =
sym == acc || acc.hasAccessorFlag && sym == acc.accessed
if (acc.accessBoundary(clazz) != rootMirror.RootClass)
unit.error(acc.pos, "value class needs to have a publicly accessible val parameter")
for (stat <- body)
if (!treeInfo.isAllowedInUniversalTrait(stat) && !isUnderlyingAcc(stat.symbol))
unit.error(stat.pos,
if (stat.symbol hasFlag PARAMACCESSOR) "illegal parameter for value class"
else "this statement is not allowed in value class: "+stat)
case x =>
unit.error(clazz.pos, "value class needs to have exactly one public val parameter")
}
for (tparam <- clazz.typeParams)
if (tparam hasAnnotation definitions.SpecializedClass)
unit.error(tparam.pos, "type parameter of value class may not be specialized")
}
def parentTypes(templ: Template): List[Tree] =
if (templ.parents.isEmpty) List(atPos(templ.pos)(TypeTree(AnyRefClass.tpe)))
else try {
val clazz = context.owner
// Normalize supertype and mixins so that supertype is always a class, not a trait.
var supertpt = typedTypeConstructor(templ.parents.head)
val firstParent = supertpt.tpe.typeSymbol
var mixins = templ.parents.tail map typedType
// If first parent is a trait, make it first mixin and add its superclass as first parent
while ((supertpt.tpe.typeSymbol ne null) && supertpt.tpe.typeSymbol.initialize.isTrait) {
val supertpt1 = typedType(supertpt)
if (!supertpt1.isErrorTyped) {
mixins = supertpt1 :: mixins
supertpt = TypeTree(supertpt1.tpe.firstParent) setPos supertpt.pos.focus
}
}
if (supertpt.tpe.typeSymbol == AnyClass && firstParent.isTrait)
supertpt.tpe = AnyRefClass.tpe
// Determine
// - supertparams: Missing type parameters from supertype
// - supertpe: Given supertype, polymorphic in supertparams
val supertparams = if (supertpt.hasSymbol) supertpt.symbol.typeParams else List()
var supertpe = supertpt.tpe
if (!supertparams.isEmpty)
supertpe = PolyType(supertparams, appliedType(supertpe, supertparams map (_.tpeHK)))
// A method to replace a super reference by a New in a supercall
def transformSuperCall(scall: Tree): Tree = (scall: @unchecked) match {
case Apply(fn, args) =>
treeCopy.Apply(scall, transformSuperCall(fn), args map (_.duplicate))
case Select(Super(_, _), nme.CONSTRUCTOR) =>
treeCopy.Select(
scall,
atPos(supertpt.pos.focus)(New(TypeTree(supertpe)) setType supertpe),
nme.CONSTRUCTOR)
}
treeInfo.firstConstructor(templ.body) match {
case constr @ DefDef(_, _, _, vparamss, _, cbody @ Block(cstats, cunit)) =>
// Convert constructor body to block in environment and typecheck it
val (preSuperStats, superCall) = {
val (stats, rest) = cstats span (x => !treeInfo.isSuperConstrCall(x))
(stats map (_.duplicate), if (rest.isEmpty) EmptyTree else rest.head.duplicate)
}
val cstats1 = if (superCall == EmptyTree) preSuperStats else preSuperStats :+ superCall
val cbody1 = treeCopy.Block(cbody, preSuperStats, superCall match {
case Apply(_, _) if supertparams.nonEmpty => transformSuperCall(superCall)
case _ => cunit.duplicate
})
val outercontext = context.outer
assert(clazz != NoSymbol, templ)
val cscope = outercontext.makeNewScope(constr, outercontext.owner)
val cbody2 = newTyper(cscope) // called both during completion AND typing.
.typePrimaryConstrBody(clazz,
cbody1, supertparams, clazz.unsafeTypeParams, vparamss map (_.map(_.duplicate)))
superCall match {
case Apply(_, _) =>
val sarg = treeInfo.firstArgument(superCall)
if (sarg != EmptyTree && supertpe.typeSymbol != firstParent)
ConstrArgsInTraitParentTpeError(sarg, firstParent)
if (!supertparams.isEmpty)
supertpt = TypeTree(cbody2.tpe) setPos supertpt.pos.focus
case _ =>
if (!supertparams.isEmpty)
MissingTypeArgumentsParentTpeError(supertpt)
}
val preSuperVals = treeInfo.preSuperFields(templ.body)
if (preSuperVals.isEmpty && preSuperStats.nonEmpty)
debugwarn("Wanted to zip empty presuper val list with " + preSuperStats)
else
map2(preSuperStats, preSuperVals)((ldef, gdef) => gdef.tpt.tpe = ldef.symbol.tpe)
case _ =>
if (!supertparams.isEmpty)
MissingTypeArgumentsParentTpeError(supertpt)
}
/* experimental: early types as type arguments
val hasEarlyTypes = templ.body exists (treeInfo.isEarlyTypeDef)
val earlyMap = new EarlyMap(clazz)
List.mapConserve(supertpt :: mixins){ tpt =>
val tpt1 = checkNoEscaping.privates(clazz, tpt)
if (hasEarlyTypes) tpt1 else tpt1 setType earlyMap(tpt1.tpe)
}
*/
//Console.println("parents("+clazz") = "+supertpt :: mixins);//DEBUG
// Certain parents are added in the parser before it is known whether
// that class also declared them as parents. For instance, this is an
// error unless we take corrective action here:
//
// case class Foo() extends Serializable
//
// So we strip the duplicates before typer.
def fixDuplicates(remaining: List[Tree]): List[Tree] = remaining match {
case Nil => Nil
case x :: xs =>
val sym = x.symbol
x :: fixDuplicates(
if (isPossibleSyntheticParent(sym)) xs filterNot (_.symbol == sym)
else xs
)
}
fixDuplicates(supertpt :: mixins) mapConserve (tpt => checkNoEscaping.privates(clazz, tpt))
}
catch {
case ex: TypeError =>
// fallback in case of cyclic errors
// @H none of the tests enter here but I couldn't rule it out
log("Type error calculating parents in template " + templ)
log("Error: " + ex)
ParentTypesError(templ, ex)
List(TypeTree(AnyRefClass.tpe))
}
/** <p>Check that</p>
* <ul>
* <li>all parents are class types,</li>
* <li>first parent class is not a mixin; following classes are mixins,</li>
* <li>final classes are not inherited,</li>
* <li>
* sealed classes are only inherited by classes which are
* nested within definition of base class, or that occur within same
* statement sequence,
* </li>
* <li>self-type of current class is a subtype of self-type of each parent class.</li>
* <li>no two parents define same symbol.</li>
* </ul>
*/
def validateParentClasses(parents: List[Tree], selfType: Type) {
val pending = ListBuffer[AbsTypeError]()
def validateParentClass(parent: Tree, superclazz: Symbol) {
if (!parent.isErrorTyped) {
val psym = parent.tpe.typeSymbol.initialize
checkStablePrefixClassType(parent)
if (psym != superclazz) {
if (psym.isTrait) {
val ps = psym.info.parents
if (!ps.isEmpty && !superclazz.isSubClass(ps.head.typeSymbol))
pending += ParentSuperSubclassError(parent, superclazz, ps.head.typeSymbol, psym)
} else {
pending += ParentNotATraitMixinError(parent, psym)
}
}
if (psym.isFinal)
pending += ParentFinalInheritanceError(parent, psym)
if (psym.isSealed && !phase.erasedTypes)
if (context.unit.source.file == psym.sourceFile)
psym addChild context.owner
else
pending += ParentSealedInheritanceError(parent, psym)
if (!(selfType <:< parent.tpe.typeOfThis) &&
!phase.erasedTypes &&
!context.owner.isSynthetic && // don't check synthetic concrete classes for virtuals (part of DEVIRTUALIZE)
!settings.noSelfCheck.value && // setting to suppress this very check
!selfType.isErroneous &&
!parent.tpe.isErroneous)
{
//Console.println(context.owner);//DEBUG
//Console.println(context.owner.unsafeTypeParams);//DEBUG
//Console.println(List.fromArray(context.owner.info.closure));//DEBUG
pending += ParentSelfTypeConformanceError(parent, selfType)
if (settings.explaintypes.value) explainTypes(selfType, parent.tpe.typeOfThis)
}
if (parents exists (p => p != parent && p.tpe.typeSymbol == psym && !psym.isError))
pending += ParentInheritedTwiceError(parent, psym)
}
}
if (!parents.isEmpty && parents.forall(!_.isErrorTyped))
for (p <- parents) validateParentClass(p, parents.head.tpe.typeSymbol)
/*
if (settings.Xshowcls.value != "" &&
settings.Xshowcls.value == context.owner.fullName)
println("INFO "+context.owner+
", baseclasses = "+(context.owner.info.baseClasses map (_.fullName))+
", lin = "+(context.owner.info.baseClasses map (context.owner.thisType.baseType)))
*/
pending.foreach(ErrorUtils.issueTypeError)
}
def checkFinitary(classinfo: ClassInfoType) {
val clazz = classinfo.typeSymbol
for (tparam <- clazz.typeParams) {
if (classinfo.expansiveRefs(tparam) contains tparam) {
val newinfo = ClassInfoType(
classinfo.parents map (_.instantiateTypeParams(List(tparam), List(AnyRefClass.tpe))),
classinfo.decls,
clazz)
clazz.setInfo {
clazz.info match {
case PolyType(tparams, _) => PolyType(tparams, newinfo)
case _ => newinfo
}
}
FinitaryError(tparam)
}
}
}
/**
* @param cdef ...
* @return ...
*/
def typedClassDef(cdef: ClassDef): Tree = {
// attributes(cdef)
val clazz = cdef.symbol
val typedMods = typedModifiers(cdef.mods)
assert(clazz != NoSymbol, cdef)
reenterTypeParams(cdef.tparams)
val tparams1 = cdef.tparams mapConserve (typedTypeDef)
val impl1 = typerReportAnyContextErrors(context.make(cdef.impl, clazz, newScope)) {
_.typedTemplate(cdef.impl, parentTypes(cdef.impl))
}
val impl2 = finishMethodSynthesis(impl1, clazz, context)
if (clazz.isTrait && clazz.info.parents.nonEmpty && clazz.info.firstParent.normalize.typeSymbol == AnyClass)
for (stat <- impl2.body)
if (!treeInfo.isAllowedInUniversalTrait(stat))
unit.error(stat.pos, "this statement is not allowed in universal trait extending from class Any: "+stat)
if ((clazz != ClassfileAnnotationClass) &&
(clazz isNonBottomSubClass ClassfileAnnotationClass))
restrictionWarning(cdef.pos, unit,
"subclassing Classfile does not\n"+
"make your annotation visible at runtime. If that is what\n"+
"you want, you must write the annotation class in Java.")
if (!isPastTyper) {
for (ann <- clazz.getAnnotation(DeprecatedAttr)) {
val m = companionSymbolOf(clazz, context)
if (m != NoSymbol)
m.moduleClass.addAnnotation(AnnotationInfo(ann.atp, ann.args, List()))
}
}
treeCopy.ClassDef(cdef, typedMods, cdef.name, tparams1, impl2)
.setType(NoType)
}
/**
* @param mdef ...
* @return ...
*/
def typedModuleDef(mdef: ModuleDef): Tree = {
// initialize all constructors of the linked class: the type completer (Namer.methodSig)
// might add default getters to this object. example: "object T; class T(x: Int = 1)"
val linkedClass = companionSymbolOf(mdef.symbol, context)
if (linkedClass != NoSymbol)
linkedClass.info.decl(nme.CONSTRUCTOR).alternatives foreach (_.initialize)
val clazz = mdef.symbol.moduleClass
val typedMods = typedModifiers(mdef.mods)
assert(clazz != NoSymbol, mdef)
val noSerializable = (
(linkedClass eq NoSymbol)
|| linkedClass.isErroneous
|| !linkedClass.isSerializable
|| clazz.isSerializable
)
val impl1 = typerReportAnyContextErrors(context.make(mdef.impl, clazz, newScope)) {
_.typedTemplate(mdef.impl, {
parentTypes(mdef.impl) ++ (
if (noSerializable) Nil
else {
clazz.makeSerializable()
List(TypeTree(SerializableClass.tpe) setPos clazz.pos.focus)
}
)
})
}
val impl2 = finishMethodSynthesis(impl1, clazz, context)
treeCopy.ModuleDef(mdef, typedMods, mdef.name, impl2) setType NoType
}
/** In order to override this in the TreeCheckers Typer so synthetics aren't re-added
* all the time, it is exposed here the module/class typing methods go through it.
* ...but it turns out it's also the ideal spot for namer/typer coordination for
* the tricky method synthesis scenarios, so we'll make it that.
*/
protected def finishMethodSynthesis(templ: Template, clazz: Symbol, context: Context): Template = {
addSyntheticMethods(templ, clazz, context)
}
/** For flatMapping a list of trees when you want the DocDefs and Annotated
* to be transparent.
*/
def rewrappingWrapperTrees(f: Tree => List[Tree]): Tree => List[Tree] = {
case dd @ DocDef(comment, defn) => f(defn) map (stat => DocDef(comment, stat) setPos dd.pos)
case Annotated(annot, defn) => f(defn) map (stat => Annotated(annot, stat))
case tree => f(tree)
}
protected def enterSyms(txt: Context, trees: List[Tree]) = {
var txt0 = txt
for (tree <- trees) txt0 = enterSym(txt0, tree)
}
protected def enterSym(txt: Context, tree: Tree): Context =
if (txt eq context) namer.enterSym(tree)
else newNamer(txt).enterSym(tree)
/**
* @param templ ...
* @param parents1 ...
* <li> <!-- 2 -->
* Check that inner classes do not inherit from Annotation
* </li>
* @return ...
*/
def typedTemplate(templ: Template, parents1: List[Tree]): Template = {
val clazz = context.owner
// complete lazy annotations
val annots = clazz.annotations
if (templ.symbol == NoSymbol)
templ setSymbol clazz.newLocalDummy(templ.pos)
val self1 = templ.self match {
case vd @ ValDef(_, _, tpt, EmptyTree) =>
val tpt1 = checkNoEscaping.privates(
clazz.thisSym,
treeCopy.TypeTree(tpt).setOriginal(tpt) setType vd.symbol.tpe
)
copyValDef(vd)(tpt = tpt1, rhs = EmptyTree) setType NoType
}
// was:
// val tpt1 = checkNoEscaping.privates(clazz.thisSym, typedType(tpt))
// treeCopy.ValDef(vd, mods, name, tpt1, EmptyTree) setType NoType
// but this leads to cycles for existential self types ==> #2545
if (self1.name != nme.WILDCARD)
context.scope enter self1.symbol
val selfType = (
if (clazz.isAnonymousClass && !phase.erasedTypes)
intersectionType(clazz.info.parents, clazz.owner)
else
clazz.typeOfThis
)
// the following is necessary for templates generated later
assert(clazz.info.decls != EmptyScope, clazz)
enterSyms(context.outer.make(templ, clazz, clazz.info.decls), templ.body)
validateParentClasses(parents1, selfType)
if (clazz.isCase)
validateNoCaseAncestor(clazz)
if ((clazz isSubClass ClassfileAnnotationClass) && !clazz.owner.isPackageClass)
unit.error(clazz.pos, "inner classes cannot be classfile annotations")
if (!phase.erasedTypes && !clazz.info.resultType.isError) // @S: prevent crash for duplicated type members
checkFinitary(clazz.info.resultType.asInstanceOf[ClassInfoType])
val body =
if (isPastTyper || reporter.hasErrors) templ.body
else templ.body flatMap rewrappingWrapperTrees(namer.addDerivedTrees(Typer.this, _))
val body1 = typedStats(body, templ.symbol)
if (clazz.isDerivedValueClass)
validateDerivedValueClass(clazz, body1)
treeCopy.Template(templ, parents1, self1, body1) setType clazz.tpe
}
/** Remove definition annotations from modifiers (they have been saved
* into the symbol's ``annotations'' in the type completer / namer)
*
* However reification does need annotation definitions to proceed.
* Unfortunately, AnnotationInfo doesn't provide enough info to reify it in general case.
* The biggest problem is with the "atp: Type" field, which cannot be reified in some situations
* that involve locally defined annotations. See more about that in Reifiers.scala.
*
* That's why the original tree gets saved into ``original'' field of AnnotationInfo (happens elsewhere).
* The field doesn't get pickled/unpickled and exists only during a single compilation run.
* This simultaneously allows us to reify annotations and to preserve backward compatibility.
*/
def typedModifiers(mods: Modifiers): Modifiers =
mods.copy(annotations = Nil) setPositions mods.positions
/**
* @param vdef ...
* @return ...
*/
def typedValDef(vdef: ValDef): ValDef = {
// attributes(vdef)
val sym = vdef.symbol.initialize
val typer1 = constrTyperIf(sym.isParameter && sym.owner.isConstructor)
val typedMods = typedModifiers(vdef.mods)
// complete lazy annotations
val annots = sym.annotations
var tpt1 = checkNoEscaping.privates(sym, typer1.typedType(vdef.tpt))
checkNonCyclic(vdef, tpt1)
if (sym.hasAnnotation(definitions.VolatileAttr)) {
if (!sym.isMutable)
VolatileValueError(vdef)
else if (sym.isFinal)
FinalVolatileVarError(vdef)
}
val rhs1 =
if (vdef.rhs.isEmpty) {
if (sym.isVariable && sym.owner.isTerm && !isPastTyper)
LocalVarUninitializedError(vdef)
vdef.rhs
} else {
val tpt2 = if (sym.hasDefault) {
// When typechecking default parameter, replace all type parameters in the expected type by Wildcard.
// This allows defining "def foo[T](a: T = 1)"
val tparams = sym.owner.skipConstructor.info.typeParams
val subst = new SubstTypeMap(tparams, tparams map (_ => WildcardType)) {
override def matches(sym: Symbol, sym1: Symbol) =
if (sym.isSkolem) matches(sym.deSkolemize, sym1)
else if (sym1.isSkolem) matches(sym, sym1.deSkolemize)
else super[SubstTypeMap].matches(sym, sym1)
}
// allow defaults on by-name parameters
if (sym hasFlag BYNAMEPARAM)
if (tpt1.tpe.typeArgs.isEmpty) WildcardType // during erasure tpt1 is Function0
else subst(tpt1.tpe.typeArgs(0))
else subst(tpt1.tpe)
} else tpt1.tpe
newTyper(typer1.context.make(vdef, sym)).transformedOrTyped(vdef.rhs, EXPRmode | BYVALmode, tpt2)
}
treeCopy.ValDef(vdef, typedMods, vdef.name, tpt1, checkDead(rhs1)) setType NoType
}
/** Enter all aliases of local parameter accessors.
*
* @param clazz ...
* @param vparamss ...
* @param rhs ...
*/
def computeParamAliases(clazz: Symbol, vparamss: List[List[ValDef]], rhs: Tree) {
log("computing param aliases for "+clazz+":"+clazz.primaryConstructor.tpe+":"+rhs)//debug
def decompose(call: Tree): (Tree, List[Tree]) = call match {
case Apply(fn, args) =>
val (superConstr, args1) = decompose(fn)
val params = fn.tpe.params
val args2 = if (params.isEmpty || !isRepeatedParamType(params.last.tpe)) args
else args.take(params.length - 1) :+ EmptyTree
assert(sameLength(args2, params), "mismatch " + clazz + " " + (params map (_.tpe)) + " " + args2)//debug
(superConstr, args1 ::: args2)
case Block(stats, expr) if !stats.isEmpty =>
decompose(stats.last)
case _ =>
(call, List())
}
val (superConstr, superArgs) = decompose(rhs)
assert(superConstr.symbol ne null, superConstr)//debug
val pending = ListBuffer[AbsTypeError]()
// an object cannot be allowed to pass a reference to itself to a superconstructor
// because of initialization issues; bug #473
for (arg <- superArgs ; tree <- arg) {
val sym = tree.symbol
if (sym != null && (sym.info.baseClasses contains clazz)) {
if (sym.isModule)
pending += SuperConstrReferenceError(tree)
tree match {
case This(qual) =>
pending += SuperConstrArgsThisReferenceError(tree)
case _ => ()
}
}
}
if (superConstr.symbol.isPrimaryConstructor) {
val superClazz = superConstr.symbol.owner
if (!superClazz.isJavaDefined) {
val superParamAccessors = superClazz.constrParamAccessors
if (sameLength(superParamAccessors, superArgs)) {
for ((superAcc, superArg @ Ident(name)) <- superParamAccessors zip superArgs) {
if (vparamss.exists(_.exists(_.symbol == superArg.symbol))) {
var alias = superAcc.initialize.alias
if (alias == NoSymbol)
alias = superAcc.getter(superAcc.owner)
if (alias != NoSymbol &&
superClazz.info.nonPrivateMember(alias.name) != alias)
alias = NoSymbol
if (alias != NoSymbol) {
var ownAcc = clazz.info.decl(name).suchThat(_.isParamAccessor)
if ((ownAcc hasFlag ACCESSOR) && !ownAcc.isDeferred)
ownAcc = ownAcc.accessed
if (!ownAcc.isVariable && !alias.accessed.isVariable) {
debuglog("" + ownAcc + " has alias "+alias.fullLocationString) //debug
ownAcc.asInstanceOf[TermSymbol].setAlias(alias)
}
}
}
}
}
}
}
pending.foreach(ErrorUtils.issueTypeError)
}
/** Check if a structurally defined method violates implementation restrictions.
* A method cannot be called if it is a non-private member of a refinement type
* and if its parameter's types are any of:
* - the self-type of the refinement
* - a type member of the refinement
* - an abstract type declared outside of the refinement.
*/
def checkMethodStructuralCompatible(meth: Symbol): Unit = {
def fail(msg: String) = unit.error(meth.pos, msg)
val tp: Type = meth.tpe match {
case mt @ MethodType(_, _) => mt
case NullaryMethodType(restpe) => restpe // TODO_NMT: drop NullaryMethodType from resultType?
case PolyType(_, restpe) => restpe
case _ => NoType
}
for (paramType <- tp.paramTypes) {
val sym = paramType.typeSymbol
if (sym.isAbstractType) {
if (!sym.hasTransOwner(meth.owner))
fail("Parameter type in structural refinement may not refer to an abstract type defined outside that refinement")
else if (!sym.hasTransOwner(meth))
fail("Parameter type in structural refinement may not refer to a type member of that refinement")
}
if (paramType.isInstanceOf[ThisType] && sym == meth.owner)
fail("Parameter type in structural refinement may not refer to the type of that refinement (self type)")
}
}
def typedUseCase(useCase: UseCase) {
def stringParser(str: String): syntaxAnalyzer.Parser = {
val file = new BatchSourceFile(context.unit.source.file, str) {
override def positionInUltimateSource(pos: Position) = {
pos.withSource(context.unit.source, useCase.pos.start)
}
}
val unit = new CompilationUnit(file)
new syntaxAnalyzer.UnitParser(unit)
}
val trees = stringParser(useCase.body+";").nonLocalDefOrDcl
val enclClass = context.enclClass.owner
def defineAlias(name: Name) =
if (context.scope.lookup(name) == NoSymbol) {
lookupVariable(name.toString.substring(1), enclClass) match {
case Some(repl) =>
silent(_.typedTypeConstructor(stringParser(repl).typ())) match {
case SilentResultValue(tpt) =>
val alias = enclClass.newAliasType(name.toTypeName, useCase.pos)
val tparams = cloneSymbolsAtOwner(tpt.tpe.typeSymbol.typeParams, alias)
alias setInfo typeFun(tparams, appliedType(tpt.tpe, tparams map (_.tpe)))
context.scope.enter(alias)
case _ =>
}
case _ =>
}
}
for (tree <- trees; t <- tree)
t match {
case Ident(name) if name startsWith '$' => defineAlias(name)
case _ =>
}
useCase.aliases = context.scope.toList
namer.enterSyms(trees)
typedStats(trees, NoSymbol)
useCase.defined = context.scope.toList filterNot (useCase.aliases contains _)
if (settings.debug.value)
useCase.defined foreach (sym => println("defined use cases: %s:%s".format(sym, sym.tpe)))
}
/**
* @param ddef ...
* @return ...
*/
def typedDefDef(ddef: DefDef): DefDef = {
val meth = ddef.symbol.initialize
reenterTypeParams(ddef.tparams)
reenterValueParams(ddef.vparamss)
// for `val` and `var` parameter, look at `target` meta-annotation
if (!isPastTyper && meth.isPrimaryConstructor) {
for (vparams <- ddef.vparamss; vd <- vparams) {
if (vd.mods.isParamAccessor) {
namer.validateParam(vd)
}
}
}
val tparams1 = ddef.tparams mapConserve typedTypeDef
val vparamss1 = ddef.vparamss mapConserve (_ mapConserve typedValDef)
// complete lazy annotations
val annots = meth.annotations
for (vparams1 <- vparamss1; vparam1 <- vparams1 dropRight 1)
if (isRepeatedParamType(vparam1.symbol.tpe))
StarParamNotLastError(vparam1)
var tpt1 = checkNoEscaping.privates(meth, typedType(ddef.tpt))
checkNonCyclic(ddef, tpt1)
ddef.tpt.setType(tpt1.tpe)
val typedMods = typedModifiers(ddef.mods)
var rhs1 =
if (ddef.name == nme.CONSTRUCTOR && !ddef.symbol.hasStaticFlag) { // need this to make it possible to generate static ctors
if (!meth.isPrimaryConstructor &&
(!meth.owner.isClass ||
meth.owner.isModuleClass ||
meth.owner.isAnonOrRefinementClass))
InvalidConstructorDefError(ddef)
typed(ddef.rhs)
} else if (meth.isTermMacro) {
// typechecking macro bodies is sort of unconventional
// that's why we employ our custom typing scheme orchestrated outside of the typer
transformedOr(ddef.rhs, typedMacroBody(this, ddef))
} else {
transformedOrTyped(ddef.rhs, EXPRmode, tpt1.tpe)
}
if (meth.isPrimaryConstructor && meth.isClassConstructor && !isPastTyper && !reporter.hasErrors && !meth.owner.isSubClass(AnyValClass)) {
// At this point in AnyVal there is no supercall, which will blow up
// in computeParamAliases; there's nothing to be computed for Anyval anyway.
computeParamAliases(meth.owner, vparamss1, rhs1)
}
if (tpt1.tpe.typeSymbol != NothingClass && !context.returnsSeen && rhs1.tpe.typeSymbol != NothingClass)
rhs1 = checkDead(rhs1)
if (!isPastTyper && meth.owner.isClass &&
meth.paramss.exists(ps => ps.exists(_.hasDefault) && isRepeatedParamType(ps.last.tpe)))
StarWithDefaultError(meth)
if (!isPastTyper) {
val allParams = meth.paramss.flatten
for (p <- allParams) {
for (n <- p.deprecatedParamName) {
if (allParams.exists(p1 => p1.name == n || (p != p1 && p1.deprecatedParamName.exists(_ == n))))
DeprecatedParamNameError(p, n)
}
}
}
if (meth.isStructuralRefinementMember)
checkMethodStructuralCompatible(meth)
if (meth.isImplicit && !meth.isSynthetic) meth.info.paramss match {
case List(param) :: _ if !param.isImplicit =>
checkFeature(ddef.pos, ImplicitConversionsFeature, meth.toString)
case _ =>
}
treeCopy.DefDef(ddef, typedMods, ddef.name, tparams1, vparamss1, tpt1, rhs1) setType NoType
}
def typedTypeDef(tdef: TypeDef): TypeDef =
typerWithCondLocalContext(context.makeNewScope(tdef, tdef.symbol))(tdef.tparams.nonEmpty){
_.typedTypeDef0(tdef)
}
// call typedTypeDef instead
// a TypeDef with type parameters must always be type checked in a new scope
private def typedTypeDef0(tdef: TypeDef): TypeDef = {
tdef.symbol.initialize
reenterTypeParams(tdef.tparams)
val tparams1 = tdef.tparams mapConserve typedTypeDef
val typedMods = typedModifiers(tdef.mods)
// complete lazy annotations
val annots = tdef.symbol.annotations
// @specialized should not be pickled when compiling with -no-specialize
if (settings.nospecialization.value && currentRun.compiles(tdef.symbol)) {
tdef.symbol.removeAnnotation(definitions.SpecializedClass)
tdef.symbol.deSkolemize.removeAnnotation(definitions.SpecializedClass)
}
val rhs1 = checkNoEscaping.privates(tdef.symbol, typedType(tdef.rhs))
checkNonCyclic(tdef.symbol)
if (tdef.symbol.owner.isType)
rhs1.tpe match {
case TypeBounds(lo1, hi1) if (!(lo1 <:< hi1)) => LowerBoundError(tdef, lo1, hi1)
case _ => ()
}
if (tdef.symbol.isDeferred && tdef.symbol.info.isHigherKinded)
checkFeature(tdef.pos, HigherKindsFeature)
treeCopy.TypeDef(tdef, typedMods, tdef.name, tparams1, rhs1) setType NoType
}
private def enterLabelDef(stat: Tree) {
stat match {
case ldef @ LabelDef(_, _, _) =>
if (ldef.symbol == NoSymbol)
ldef.symbol = namer.enterInScope(
context.owner.newLabel(ldef.name, ldef.pos) setInfo MethodType(List(), UnitClass.tpe))
case _ =>
}
}
def typedLabelDef(ldef: LabelDef): LabelDef = {
if (!nme.isLoopHeaderLabel(ldef.symbol.name) || isPastTyper) {
val restpe = ldef.symbol.tpe.resultType
val rhs1 = typed(ldef.rhs, restpe)
ldef.params foreach (param => param.tpe = param.symbol.tpe)
deriveLabelDef(ldef)(_ => rhs1) setType restpe
}
else {
val initpe = ldef.symbol.tpe.resultType
val rhs1 = typed(ldef.rhs)
val restpe = rhs1.tpe
if (restpe == initpe) { // stable result, no need to check again
ldef.params foreach (param => param.tpe = param.symbol.tpe)
treeCopy.LabelDef(ldef, ldef.name, ldef.params, rhs1) setType restpe
} else {
context.scope.unlink(ldef.symbol)
val sym2 = namer.enterInScope(
context.owner.newLabel(ldef.name, ldef.pos) setInfo MethodType(List(), restpe))
val rhs2 = typed(resetAllAttrs(ldef.rhs), restpe)
ldef.params foreach (param => param.tpe = param.symbol.tpe)
deriveLabelDef(ldef)(_ => rhs2) setSymbol sym2 setType restpe
}
}
}
/**
* @param block ...
* @param mode ...
* @param pt ...
* @return ...
*/
def typedBlock(block: Block, mode: Int, pt: Type): Block = {
val syntheticPrivates = new ListBuffer[Symbol]
try {
namer.enterSyms(block.stats)
for (stat <- block.stats) enterLabelDef(stat)
if (phaseId(currentPeriod) <= currentRun.typerPhase.id) {
// This is very tricky stuff, because we are navigating the Skylla and Charybdis of
// anonymous classes and what to return from them here. On the one hand, we cannot admit
// every non-private member of an anonymous class as a part of the structural type of the
// enclosing block. This runs afoul of the restriction that a structural type may not
// refer to an enclosing type parameter or abstract types (which in turn is necessitated
// by what can be done in Java reflection). On the other hand, making every term member
// private conflicts with private escape checking - see ticket #3174 for an example.
//
// The cleanest way forward is if we would find a way to suppress structural type checking
// for these members and maybe defer type errors to the places where members are called.
// But that would be a big refactoring and also a big departure from existing code. The
// probably safest fix for 2.8 is to keep members of an anonymous class that are not
// mentioned in a parent type private (as before) but to disable escape checking for code
// that's in the same anonymous class. That's what's done here.
//
// We really should go back and think hard whether we find a better way to address the
// problem of escaping idents on the one hand and well-formed structural types on the
// other.
block match {
case Block(List(classDef @ ClassDef(_, _, _, _)), Apply(Select(New(_), _), _)) =>
val classDecls = classDef.symbol.info.decls
val visibleMembers = pt match {
case WildcardType => classDecls.toList
case BoundedWildcardType(TypeBounds(lo, _)) => lo.members
case _ => pt.members
}
def matchesVisibleMember(member: Symbol) = visibleMembers exists { vis =>
(member.name == vis.name) &&
(member.tpe <:< vis.tpe.substThis(vis.owner, classDef.symbol))
}
// The block is an anonymous class definitions/instantiation pair
// -> members that are hidden by the type of the block are made private
val toHide = (
classDecls filter (member =>
member.isTerm
&& member.isPossibleInRefinement
&& member.isPublic
&& !matchesVisibleMember(member)
) map (member => member
resetFlag (PROTECTED | LOCAL)
setFlag (PRIVATE | SYNTHETIC_PRIVATE)
setPrivateWithin NoSymbol
)
)
syntheticPrivates ++= toHide
case _ =>
}
}
val stats1 = typedStats(block.stats, context.owner)
val expr1 = typed(block.expr, mode & ~(FUNmode | QUALmode), pt)
treeCopy.Block(block, stats1, expr1)
.setType(if (treeInfo.isExprSafeToInline(block)) expr1.tpe else expr1.tpe.deconst)
} finally {
// enable escaping privates checking from the outside and recycle
// transient flag
syntheticPrivates foreach (_ resetFlag SYNTHETIC_PRIVATE)
}
}
/**
* @param cdef ...
* @param pattpe ...
* @param pt ...
* @return ...
*/
def typedCase(cdef: CaseDef, pattpe: Type, pt: Type): CaseDef = {
// verify no _* except in last position
for (Apply(_, xs) <- cdef.pat ; x <- xs dropRight 1 ; if treeInfo isStar x)
StarPositionInPatternError(x)
// withoutAnnotations - see continuations-run/z1673.scala
// This adjustment is awfully specific to continuations, but AFAICS the
// whole AnnotationChecker framework is.
val pat1 = typedPattern(cdef.pat, pattpe.withoutAnnotations)
// When case classes have more than two parameter lists, the pattern ends
// up typed as a method. We only pattern match on the first parameter
// list, so substitute the final result type of the method, i.e. the type
// of the case class.
if (pat1.tpe.paramSectionCount > 0)
pat1 setType pat1.tpe.finalResultType
if (forInteractive) {
for (bind @ Bind(name, _) <- cdef.pat)
if (name.toTermName != nme.WILDCARD && bind.symbol != null && bind.symbol != NoSymbol)
namer.enterIfNotThere(bind.symbol)
}
val guard1: Tree = if (cdef.guard == EmptyTree) EmptyTree
else typed(cdef.guard, BooleanClass.tpe)
var body1: Tree = typed(cdef.body, pt)
val contextWithTypeBounds = context.nextEnclosing(_.tree.isInstanceOf[CaseDef])
if (contextWithTypeBounds.savedTypeBounds.nonEmpty) {
body1.tpe = contextWithTypeBounds restoreTypeBounds body1.tpe
// insert a cast if something typechecked under the GADT constraints,
// but not in real life (i.e., now that's we've reset the method's type skolems'
// infos back to their pre-GADT-constraint state)
if (isFullyDefined(pt) && !(body1.tpe <:< pt))
body1 = typedPos(body1.pos)(gen.mkCast(body1, pt))
}
// body1 = checkNoEscaping.locals(context.scope, pt, body1)
val treeWithSkolems = treeCopy.CaseDef(cdef, pat1, guard1, body1) setType body1.tpe
new TypeMapTreeSubstituter(deskolemizeGADTSkolems).traverse(treeWithSkolems)
treeWithSkolems // now without skolems, actually
}
// undo adaptConstrPattern's evil deeds, as they confuse the old pattern matcher
// the flags are used to avoid accidentally deskolemizing unrelated skolems of skolems
object deskolemizeGADTSkolems extends TypeMap {
def apply(tp: Type): Type = mapOver(tp) match {
case TypeRef(pre, sym, args) if sym.isGADTSkolem =>
typeRef(NoPrefix, sym.deSkolemize, args)
case tp1 => tp1
}
}
def typedCases(cases: List[CaseDef], pattp: Type, pt: Type): List[CaseDef] =
cases mapConserve { cdef =>
newTyper(context.makeNewScope(cdef, context.owner)).typedCase(cdef, pattp, pt)
}
def adaptCase(cdef: CaseDef, mode: Int, tpe: Type): CaseDef = deriveCaseDef(cdef)(adapt(_, mode, tpe))
def ptOrLub(tps: List[Type], pt: Type ) = if (isFullyDefined(pt)) (pt, false) else weakLub(tps map (_.deconst))
def ptOrLubPacked(trees: List[Tree], pt: Type) = if (isFullyDefined(pt)) (pt, false) else weakLub(trees map (c => packedType(c, context.owner).deconst))
// takes untyped sub-trees of a match and type checks them
def typedMatch(selector: Tree, cases: List[CaseDef], mode: Int, pt: Type, tree: Tree = EmptyTree): Match = {
val selector1 = checkDead(typed(selector, EXPRmode | BYVALmode, WildcardType))
val selectorTp = packCaptured(selector1.tpe.widen).skolemizeExistential(context.owner, selector)
val casesTyped = typedCases(cases, selectorTp, pt)
val (resTp, needAdapt) =
if (opt.virtPatmat) ptOrLubPacked(casesTyped, pt)
else ptOrLub(casesTyped map (_.tpe), pt)
val casesAdapted = if (!needAdapt) casesTyped else casesTyped map (adaptCase(_, mode, resTp))
treeCopy.Match(tree, selector1, casesAdapted) setType resTp
}
// match has been typed -- virtualize it if we're feeling experimental
// (virtualized matches are expanded during type checking so they have the full context available)
// otherwise, do nothing: matches are translated during phase `patmat` (unless -Xoldpatmat)
def virtualizedMatch(match_ : Match, mode: Int, pt: Type) = {
import patmat.{vpmName, PureMatchTranslator, OptimizingMatchTranslator}
// TODO: add fallback __match sentinel to predef
val matchStrategy: Tree =
if (!(newPatternMatching && opt.experimental && context.isNameInScope(vpmName._match))) null // fast path, avoiding the next line if there's no __match to be seen
else newTyper(context.makeImplicit(reportAmbiguousErrors = false)).silent(_.typed(Ident(vpmName._match), EXPRmode, WildcardType), reportAmbiguousErrors = false) match {
case SilentResultValue(ms) => ms
case _ => null
}
if (matchStrategy ne null) // virtualize
typed((new PureMatchTranslator(this.asInstanceOf[patmat.global.analyzer.Typer] /*TODO*/, matchStrategy)).translateMatch(match_), mode, pt)
else
match_ // will be translated in phase `patmat`
}
// synthesize and type check a PartialFunction implementation based on a match specified by `cases`
// Match(EmptyTree, cases) ==> new PartialFunction { def apply<OrElse>(params) = `translateMatch('`(param1,...,paramN)` match { cases }')` }
// for fresh params, the selector of the match we'll translated simply gathers those in a tuple
// NOTE: restricted to PartialFunction -- leave Function trees if the expected type does not demand a partial function
class MatchFunTyper(tree: Tree, cases: List[CaseDef], mode: Int, pt0: Type) {
// TODO: remove FunctionN support -- this is currently designed so that it can emit FunctionN and PartialFunction subclasses
// however, we should leave Function nodes until Uncurry so phases after typer can still detect normal Function trees
// we need to synthesize PartialFunction impls, though, to avoid nastiness in Uncurry in transforming&duplicating generated pattern matcher trees
// TODO: remove PartialFunction support from UnCurry
private val pt = deskolemizeGADTSkolems(pt0)
private val targs = pt.normalize.typeArgs
private val arity = if (isFunctionType(pt)) targs.length - 1 else 1 // TODO pt should always be a (Partial)Function, right?
private val ptRes = if (targs.isEmpty) WildcardType else targs.last // may not be fully defined
private val isPartial = pt.typeSymbol == PartialFunctionClass
assert(isPartial)
private val anonClass = context.owner.newAnonymousFunctionClass(tree.pos)
private val funThis = This(anonClass)
anonClass addAnnotation AnnotationInfo(SerialVersionUIDAttr.tpe, List(Literal(Constant(0))), List())
def deriveFormals =
if (targs.isEmpty) Nil
else targs.init
def mkParams(methodSym: Symbol, formals: List[Type] = deriveFormals) =
if (formals.isEmpty) { MissingParameterTypeAnonMatchError(tree, pt); Nil }
else methodSym newSyntheticValueParams formals
def mkSel(params: List[Symbol]) =
if (params.isEmpty) EmptyTree
else {
val ids = params map (p => Ident(p.name))
atPos(tree.pos.focusStart) { if (arity == 1) ids.head else gen.mkTuple(ids) }
}
import CODE._
// need to duplicate the cases before typing them to generate the apply method, or the symbols will be all messed up
val casesTrue = if (isPartial) cases map (c => deriveCaseDef(c)(x => atPos(x.pos.focus)(TRUE_typed)).duplicate.asInstanceOf[CaseDef]) else Nil
// println("casesTrue "+ casesTrue)
def parentsPartial(targs: List[Type]) = addSerializable(appliedType(AbstractPartialFunctionClass.typeConstructor, targs))
def applyMethod = {
// rig the show so we can get started typing the method body -- later we'll correct the infos...
anonClass setInfo ClassInfoType(addSerializable(ObjectClass.tpe, pt), newScope, anonClass)
val methodSym = anonClass.newMethod(nme.apply, tree.pos, if(isPartial) (FINAL | OVERRIDE) else FINAL)
val paramSyms = mkParams(methodSym)
val selector = mkSel(paramSyms)
if (selector eq EmptyTree) EmptyTree
else {
methodSym setInfoAndEnter MethodType(paramSyms, AnyClass.tpe)
val methodBodyTyper = newTyper(context.makeNewScope(context.tree, methodSym)) // should use the DefDef for the context's tree, but it doesn't exist yet (we need the typer we're creating to create it)
paramSyms foreach (methodBodyTyper.context.scope enter _)
val match_ = methodBodyTyper.typedMatch(gen.mkUnchecked(selector), cases, mode, ptRes)
val resTp = match_.tpe
val methFormals = paramSyms map (_.tpe)
val parents = (
if (isPartial) parentsPartial(List(methFormals.head, resTp))
else addSerializable(abstractFunctionType(methFormals, resTp))
)
anonClass setInfo ClassInfoType(parents, newScope, anonClass)
methodSym setInfoAndEnter MethodType(paramSyms, resTp)
DefDef(methodSym, methodBodyTyper.virtualizedMatch(match_, mode, resTp))
}
}
// def applyOrElse[A1 <: A, B1 >: B](x: A1, default: A1 => B1): B1 =
def applyOrElseMethodDef = {
// rig the show so we can get started typing the method body -- later we'll correct the infos...
// targs were type arguments for PartialFunction, so we know they will work for AbstractPartialFunction as well
anonClass setInfo ClassInfoType(parentsPartial(targs), newScope, anonClass)
val methodSym = anonClass.newMethod(nme.applyOrElse, tree.pos, FINAL | OVERRIDE)
// create the parameter that corresponds to the function's parameter
val List(argTp) = deriveFormals
val A1 = methodSym newTypeParameter(newTypeName("A1")) setInfo TypeBounds.upper(argTp)
val paramSyms@List(x) = mkParams(methodSym, List(A1.tpe))
val selector = mkSel(paramSyms)
if (selector eq EmptyTree) EmptyTree
else {
// applyOrElse's default parameter:
val B1 = methodSym newTypeParameter(newTypeName("B1")) setInfo TypeBounds.empty //lower(resTp)
val default = methodSym newValueParameter(newTermName("default"), tree.pos.focus, SYNTHETIC) setInfo functionType(List(A1.tpe), B1.tpe)
val paramSyms = List(x, default)
methodSym setInfoAndEnter polyType(List(A1, B1), MethodType(paramSyms, B1.tpe))
val methodBodyTyper = newTyper(context.makeNewScope(context.tree, methodSym)) // should use the DefDef for the context's tree, but it doesn't exist yet (we need the typer we're creating to create it)
paramSyms foreach (methodBodyTyper.context.scope enter _)
val match_ = methodBodyTyper.typedMatch(gen.mkUnchecked(selector), cases, mode, ptRes)
val resTp = match_.tpe
anonClass setInfo ClassInfoType(parentsPartial(List(argTp, resTp)), newScope, anonClass)
B1 setInfo TypeBounds.lower(resTp)
anonClass.info.decls enter methodSym // methodSym's info need not change (B1's bound has been updated instead)
match_ setType B1.tpe
// the default uses applyOrElse's first parameter since the scrut's type has been widened
val body = methodBodyTyper.virtualizedMatch(match_ addAttachment DefaultOverrideMatchAttachment(REF(default) APPLY (REF(x))), mode, B1.tpe)
DefDef(methodSym, body)
}
}
def isDefinedAtMethod = {
val methodSym = anonClass.newMethod(nme.isDefinedAt, tree.pos.makeTransparent, FINAL)
val paramSyms = mkParams(methodSym)
val selector = mkSel(paramSyms)
if (selector eq EmptyTree) EmptyTree
else {
val methodBodyTyper = newTyper(context.makeNewScope(context.tree, methodSym)) // should use the DefDef for the context's tree, but it doesn't exist yet (we need the typer we're creating to create it)
paramSyms foreach (methodBodyTyper.context.scope enter _)
methodSym setInfoAndEnter MethodType(paramSyms, BooleanClass.tpe)
val match_ = methodBodyTyper.typedMatch(gen.mkUnchecked(selector), casesTrue, mode, BooleanClass.tpe)
val body = methodBodyTyper.virtualizedMatch(match_ addAttachment DefaultOverrideMatchAttachment(FALSE_typed), mode, BooleanClass.tpe)
DefDef(methodSym, body)
}
}
lazy val members = if (isPartial) {
// somehow @cps annotations upset the typer when looking at applyOrElse's signature, but not apply's
// TODO: figure out the details (T @cps[U] is not a subtype of Any, but then why does it work for the apply method?)
if (targs forall (_ <:< AnyClass.tpe)) List(applyOrElseMethodDef, isDefinedAtMethod)
else List(applyMethod, isDefinedAtMethod)
} else List(applyMethod)
def translated =
if (members.head eq EmptyTree) setError(tree)
else typed(atPos(tree.pos)(Block(List(ClassDef(anonClass, NoMods, List(List()), List(List()), members, tree.pos.focus)), atPos(tree.pos.focus)(New(anonClass.tpe)))), mode, pt)
}
// Function(params, Match(sel, cases)) ==> new <Partial>Function { def apply<OrElse>(params) = `translateMatch('sel match { cases }')` }
class MatchFunTyperBetaReduced(fun: Function, sel: Tree, cases: List[CaseDef], mode: Int, pt: Type) extends MatchFunTyper(fun, cases, mode, pt) {
override def deriveFormals =
fun.vparams map { p => if(p.tpt.tpe == null) typedType(p.tpt).tpe else p.tpt.tpe }
// the only difference from the super class is that we must preserve the names of the parameters
override def mkParams(methodSym: Symbol, formals: List[Type] = deriveFormals) =
(fun.vparams, formals).zipped map { (p, tp) =>
methodSym.newValueParameter(p.name, p.pos.focus, SYNTHETIC) setInfo tp
}
override def mkSel(params: List[Symbol]) = sel.duplicate
}
/**
* @param fun ...
* @param mode ...
* @param pt ...
* @return ...
*/
def typedFunction(fun: Function, mode: Int, pt: Type): Tree = {
val numVparams = fun.vparams.length
if (numVparams > definitions.MaxFunctionArity)
return MaxFunctionArityError(fun)
def decompose(pt: Type): (Symbol, List[Type], Type) =
if ((isFunctionType(pt) || (pt.typeSymbol == PartialFunctionClass && numVparams == 1 && fun.body.isInstanceOf[Match])) && // see bug901 for a reason why next conditions are needed
( pt.normalize.typeArgs.length - 1 == numVparams
|| fun.vparams.exists(_.tpt.isEmpty)
))
(pt.typeSymbol, pt.normalize.typeArgs.init, pt.normalize.typeArgs.last)
else
(FunctionClass(numVparams), fun.vparams map (x => NoType), WildcardType)
val (clazz, argpts, respt) = decompose(pt)
if (argpts.lengthCompare(numVparams) != 0)
WrongNumberOfParametersError(fun, argpts)
else {
foreach2(fun.vparams, argpts) { (vparam, argpt) =>
if (vparam.tpt.isEmpty) {
vparam.tpt.tpe =
if (isFullyDefined(argpt)) argpt
else {
fun match {
case etaExpansion(vparams, fn, args) =>
silent(_.typed(fn, forFunMode(mode), pt)) match {
case SilentResultValue(fn1) if context.undetparams.isEmpty =>
// if context,undetparams is not empty, the function was polymorphic,
// so we need the missing arguments to infer its type. See #871
//println("typing eta "+fun+":"+fn1.tpe+"/"+context.undetparams)
val ftpe = normalize(fn1.tpe) baseType FunctionClass(numVparams)
if (isFunctionType(ftpe) && isFullyDefined(ftpe))
return typedFunction(fun, mode, ftpe)
case _ =>
}
case _ =>
}
MissingParameterTypeError(fun, vparam, pt)
ErrorType
}
if (!vparam.tpt.pos.isDefined) vparam.tpt setPos vparam.pos.focus
}
}
fun.body match {
// later phase indicates scaladoc is calling (where shit is messed up, I tell you)
// -- so fall back to old patmat, which is more forgiving
case Match(sel, cases) if (sel ne EmptyTree) && newPatternMatching && (pt.typeSymbol == PartialFunctionClass) =>
// go to outer context -- must discard the context that was created for the Function since we're discarding the function
// thus, its symbol, which serves as the current context.owner, is not the right owner
// you won't know you're using the wrong owner until lambda lift crashes (unless you know better than to use the wrong owner)
val outerTyper = newTyper(context.outer)
(new outerTyper.MatchFunTyperBetaReduced(fun, sel, cases, mode, pt)).translated
case _ =>
val vparamSyms = fun.vparams map { vparam =>
enterSym(context, vparam)
if (context.retyping) context.scope enter vparam.symbol
vparam.symbol
}
val vparams = fun.vparams mapConserve (typedValDef)
// for (vparam <- vparams) {
// checkNoEscaping.locals(context.scope, WildcardType, vparam.tpt); ()
// }
val formals = vparamSyms map (_.tpe)
val body1 = typed(fun.body, respt)
val restpe = packedType(body1, fun.symbol).deconst.resultType
val funtpe = typeRef(clazz.tpe.prefix, clazz, formals :+ restpe)
// body = checkNoEscaping.locals(context.scope, restpe, body)
treeCopy.Function(fun, vparams, body1).setType(funtpe)
}
}
}
def typedRefinement(stats: List[Tree]) {
namer.enterSyms(stats)
// need to delay rest of typedRefinement to avoid cyclic reference errors
unit.toCheck += { () =>
val stats1 = typedStats(stats, NoSymbol)
for (stat <- stats1 if stat.isDef) {
val member = stat.symbol
if (!(context.owner.ancestors forall
(bc => member.matchingSymbol(bc, context.owner.thisType) == NoSymbol))) {
member setFlag OVERRIDE
}
}
}
}
def typedImport(imp : Import) : Import = (transformed remove imp) match {
case Some(imp1: Import) => imp1
case _ => log("unhandled import: "+imp+" in "+unit); imp
}
private def isWarnablePureExpression(tree: Tree) = tree match {
case EmptyTree | Literal(Constant(())) => false
case _ =>
!tree.isErrorTyped && (treeInfo isExprSafeToInline tree) && {
val sym = tree.symbol
(sym == null) || !(sym.isModule || sym.isLazy) || {
debuglog("'Pure' but side-effecting expression in statement position: " + tree)
false
}
}
}
def typedStats(stats: List[Tree], exprOwner: Symbol): List[Tree] = {
val inBlock = exprOwner == context.owner
def includesTargetPos(tree: Tree) =
tree.pos.isRange && context.unit.exists && (tree.pos includes context.unit.targetPos)
val localTarget = stats exists includesTargetPos
val statsErrors = scala.collection.mutable.LinkedHashSet[AbsTypeError]()
def typedStat(stat: Tree): Tree = {
if (context.owner.isRefinementClass && !treeInfo.isDeclarationOrTypeDef(stat))
OnlyDeclarationsError(stat)
else
stat match {
case imp @ Import(_, _) =>
imp.symbol.initialize
if (!imp.symbol.isError) {
context = context.makeNewImport(imp)
typedImport(imp)
} else EmptyTree
case _ =>
if (localTarget && !includesTargetPos(stat)) {
// skip typechecking of statements in a sequence where some other statement includes
// the targetposition
stat
} else {
val localTyper = if (inBlock || (stat.isDef && !stat.isInstanceOf[LabelDef])) {
context.flushBuffer()
this
} else newTyper(context.make(stat, exprOwner))
// XXX this creates a spurious dead code warning if an exception is thrown
// in a constructor, even if it is the only thing in the constructor.
val result = checkDead(localTyper.typed(stat, EXPRmode | BYVALmode, WildcardType))
if (treeInfo.isSelfOrSuperConstrCall(result)) {
context.inConstructorSuffix = true
if (treeInfo.isSelfConstrCall(result) && result.symbol.pos.pointOrElse(0) >= exprOwner.enclMethod.pos.pointOrElse(0))
ConstructorsOrderError(stat)
}
if (isWarnablePureExpression(result)) context.warning(stat.pos,
"a pure expression does nothing in statement position; " +
"you may be omitting necessary parentheses"
)
statsErrors ++= localTyper.context.errBuffer
result
}
}
}
/** 'accessor' and 'accessed' are so similar it becomes very difficult to
* follow the logic, so I renamed one to something distinct.
*/
def accesses(looker: Symbol, accessed: Symbol) = accessed.hasLocalFlag && (
(accessed.isParamAccessor)
|| (looker.hasAccessorFlag && !accessed.hasAccessorFlag && accessed.isPrivate)
)
def checkNoDoubleDefs(stats: List[Tree]): Unit = {
val scope = if (inBlock) context.scope else context.owner.info.decls
var e = scope.elems
while ((e ne null) && e.owner == scope) {
var e1 = scope.lookupNextEntry(e)
while ((e1 ne null) && e1.owner == scope) {
if (!accesses(e.sym, e1.sym) && !accesses(e1.sym, e.sym) &&
(e.sym.isType || inBlock || (e.sym.tpe matches e1.sym.tpe)))
// default getters are defined twice when multiple overloads have defaults. an
// error for this is issued in RefChecks.checkDefaultsInOverloaded
if (!e.sym.isErroneous && !e1.sym.isErroneous && !e.sym.hasDefaultFlag &&
!e.sym.hasAnnotation(BridgeClass) && !e1.sym.hasAnnotation(BridgeClass)) {
log("Double definition detected:\n " +
((e.sym.getClass, e.sym.info, e.sym.ownerChain)) + "\n " +
((e1.sym.getClass, e1.sym.info, e1.sym.ownerChain)))
DefDefinedTwiceError(e.sym, e1.sym)
scope.unlink(e1) // need to unlink to avoid later problems with lub; see #2779
}
e1 = scope.lookupNextEntry(e1)
}
e = e.next
}
}
def addSynthetics(stats: List[Tree]): List[Tree] = {
val scope = if (inBlock) context.scope else context.owner.info.decls
var newStats = new ListBuffer[Tree]
var moreToAdd = true
while (moreToAdd) {
val initElems = scope.elems
for (sym <- scope)
for (tree <- context.unit.synthetics get sym) {
newStats += typedStat(tree) // might add even more synthetics to the scope
context.unit.synthetics -= sym
}
// the type completer of a synthetic might add more synthetics. example: if the
// factory method of a case class (i.e. the constructor) has a default.
moreToAdd = scope.elems ne initElems
}
if (newStats.isEmpty) stats
else {
// put default getters next to the method they belong to,
// same for companion objects. fixes #2489 and #4036.
// [Martin] This is pretty ugly. I think we could avoid
// this code by associating defaults and companion objects
// with the original tree instead of the new symbol.
def matches(stat: Tree, synt: Tree) = (stat, synt) match {
case (DefDef(_, statName, _, _, _, _), DefDef(mods, syntName, _, _, _, _)) =>
mods.hasDefaultFlag && syntName.toString.startsWith(statName.toString)
case (ClassDef(_, className, _, _), ModuleDef(_, moduleName, _)) =>
className.toTermName == moduleName
case _ => false
}
def matching(stat: Tree): List[Tree] = {
val (pos, neg) = newStats.partition(synt => matches(stat, synt))
newStats = neg
pos.toList
}
(stats foldRight List[Tree]())((stat, res) => {
stat :: matching(stat) ::: res
}) ::: newStats.toList
}
}
val stats1 = withSavedContext(context) {
val result = stats mapConserve typedStat
context.flushBuffer()
result
}
context.updateBuffer(statsErrors)
if (phase.erasedTypes) stats1
else {
checkNoDoubleDefs(stats1)
addSynthetics(stats1)
}
}
def typedArg(arg: Tree, mode: Int, newmode: Int, pt: Type): Tree = {
val typedMode = onlyStickyModes(mode) | newmode
val t = withCondConstrTyper((mode & SCCmode) != 0)(_.typed(arg, typedMode, pt))
checkDead.inMode(typedMode, t)
}
def typedArgs(args: List[Tree], mode: Int) =
args mapConserve (arg => typedArg(arg, mode, 0, WildcardType))
def typedArgs(args0: List[Tree], mode: Int, formals0: List[Type], adapted0: List[Type]): List[Tree] = {
val sticky = onlyStickyModes(mode)
def loop(args: List[Tree], formals: List[Type], adapted: List[Type]): List[Tree] = {
if (args.isEmpty || adapted.isEmpty) Nil
else {
// No formals left or * indicates varargs.
val isVarArgs = formals.isEmpty || formals.tail.isEmpty && isRepeatedParamType(formals.head)
val typedMode = sticky | (
if (isVarArgs) STARmode | BYVALmode
else if (isByNameParamType(formals.head)) 0
else BYVALmode
)
var tree = typedArg(args.head, mode, typedMode, adapted.head)
if (hasPendingMacroExpansions) tree = macroExpandAll(this, tree)
// formals may be empty, so don't call tail
tree :: loop(args.tail, formals drop 1, adapted.tail)
}
}
loop(args0, formals0, adapted0)
}
/** Does function need to be instantiated, because a missing parameter
* in an argument closure overlaps with an uninstantiated formal?
*/
def needsInstantiation(tparams: List[Symbol], formals: List[Type], args: List[Tree]) = {
def isLowerBounded(tparam: Symbol) = !tparam.info.bounds.lo.typeSymbol.isBottomClass
exists2(formals, args) {
case (formal, Function(vparams, _)) =>
(vparams exists (_.tpt.isEmpty)) &&
vparams.length <= MaxFunctionArity &&
(formal baseType FunctionClass(vparams.length) match {
case TypeRef(_, _, formalargs) =>
( exists2(formalargs, vparams)((formal, vparam) =>
vparam.tpt.isEmpty && (tparams exists formal.contains))
&& (tparams forall isLowerBounded)
)
case _ =>
false
})
case _ =>
false
}
}
/** Is `tree` a block created by a named application?
*/
def isNamedApplyBlock(tree: Tree) =
context.namedApplyBlockInfo exists (_._1 == tree)
def callToCompanionConstr(context: Context, calledFun: Symbol) = {
calledFun.isConstructor && {
val methCtx = context.enclMethod
(methCtx != NoContext) && {
val contextFun = methCtx.tree.symbol
contextFun.isPrimaryConstructor && contextFun.owner.isModuleClass &&
companionSymbolOf(calledFun.owner, context).moduleClass == contextFun.owner
}
}
}
def doTypedApply(tree: Tree, fun0: Tree, args: List[Tree], mode: Int, pt: Type): Tree = {
// TODO_NMT: check the assumption that args nonEmpty
def duplErrTree = setError(treeCopy.Apply(tree, fun0, args))
def duplErrorTree(err: AbsTypeError) = { issue(err); duplErrTree }
var fun = fun0
if (fun.hasSymbol && fun.symbol.isOverloaded) {
// remove alternatives with wrong number of parameters without looking at types.
// less expensive than including them in inferMethodAlternatvie (see below).
def shapeType(arg: Tree): Type = arg match {
case Function(vparams, body) =>
functionType(vparams map (vparam => AnyClass.tpe), shapeType(body))
case AssignOrNamedArg(Ident(name), rhs) =>
NamedType(name, shapeType(rhs))
case _ =>
NothingClass.tpe
}
val argtypes = args map shapeType
val pre = fun.symbol.tpe.prefix
var sym = fun.symbol filter { alt =>
// must use pt as expected type, not WildcardType (a tempting quick fix to #2665)
// now fixed by using isWeaklyCompatible in exprTypeArgs
// TODO: understand why exactly -- some types were not inferred anymore (`ant clean quick.bin` failed)
// (I had expected inferMethodAlternative to pick up the slack introduced by using WildcardType here)
//
// @PP responds: I changed it to pass WildcardType instead of pt and only one line in
// trunk (excluding scalacheck, which had another) failed to compile. It was this line in
// Types: "refs = Array(Map(), Map())". I determined that inference fails if there are at
// least two invariant type parameters. See the test case I checked in to help backstop:
// pos/isApplicableSafe.scala.
isApplicableSafe(context.undetparams, followApply(pre.memberType(alt)), argtypes, pt)
}
if (sym.isOverloaded) {
val sym1 = sym filter (alt => {
// eliminate functions that would result from tupling transforms
// keeps alternatives with repeated params
hasExactlyNumParams(followApply(alt.tpe), argtypes.length) ||
// also keep alts which define at least one default
alt.tpe.paramss.exists(_.exists(_.hasDefault))
})
if (sym1 != NoSymbol) sym = sym1
}
if (sym != NoSymbol)
fun = adapt(fun setSymbol sym setType pre.memberType(sym), forFunMode(mode), WildcardType)
}
fun.tpe match {
case OverloadedType(pre, alts) =>
val undetparams = context.extractUndetparams()
val argtpes = new ListBuffer[Type]
val amode = forArgMode(fun, mode)
val args1 = args map {
case arg @ AssignOrNamedArg(Ident(name), rhs) =>
// named args: only type the righthand sides ("unknown identifier" errors otherwise)
val rhs1 = typedArg(rhs, amode, BYVALmode, WildcardType)
argtpes += NamedType(name, rhs1.tpe.deconst)
// the assign is untyped; that's ok because we call doTypedApply
atPos(arg.pos) { new AssignOrNamedArg(arg.lhs , rhs1) }
case arg =>
val arg1 = typedArg(arg, amode, BYVALmode, WildcardType)
argtpes += arg1.tpe.deconst
arg1
}
context.undetparams = undetparams
if (context.hasErrors)
setError(tree)
else {
inferMethodAlternative(fun, undetparams, argtpes.toList, pt, varArgsOnly = treeInfo.isWildcardStarArgList(args))
doTypedApply(tree, adapt(fun, forFunMode(mode), WildcardType), args1, mode, pt)
}
case mt @ MethodType(params, _) =>
val paramTypes = mt.paramTypes
// repeat vararg as often as needed, remove by-name
val formals = formalTypes(paramTypes, args.length)
/** Try packing all arguments into a Tuple and apply `fun`
* to that. This is the last thing which is tried (after
* default arguments)
*/
def tryTupleApply: Option[Tree] = {
// if 1 formal, 1 arg (a tuple), otherwise unmodified args
val tupleArgs = actualArgs(tree.pos.makeTransparent, args, formals.length)
if (!sameLength(tupleArgs, args) && !isUnitForVarArgs(args, params)) {
// expected one argument, but got 0 or >1 ==> try applying to tuple
// the inner "doTypedApply" does "extractUndetparams" => restore when it fails
val savedUndetparams = context.undetparams
silent(_.doTypedApply(tree, fun, tupleArgs, mode, pt)) match {
case SilentResultValue(t) =>
// Depending on user options, may warn or error here if
// a Unit or tuple was inserted.
Some(t) filter (tupledTree =>
!inExprModeButNot(mode, FUNmode)
|| tupledTree.symbol == null
|| checkValidAdaptation(tupledTree, args)
)
case _ =>
context.undetparams = savedUndetparams
None
}
} else None
}
/** Treats an application which uses named or default arguments.
* Also works if names + a vararg used: when names are used, the vararg
* parameter has to be specified exactly once. Note that combining varargs
* and defaults is ruled out by typedDefDef.
*/
def tryNamesDefaults: Tree = {
val lencmp = compareLengths(args, formals)
def checkNotMacro() = {
if (fun.symbol != null && fun.symbol.filter(sym => sym != null && sym.isTermMacro && !sym.isErroneous) != NoSymbol)
duplErrorTree(NamedAndDefaultArgumentsNotSupportedForMacros(tree, fun))
}
if (mt.isErroneous) duplErrTree
else if (inPatternMode(mode)) {
// #2064
duplErrorTree(WrongNumberOfArgsError(tree, fun))
} else if (lencmp > 0) {
tryTupleApply getOrElse duplErrorTree(TooManyArgsNamesDefaultsError(tree, fun))
} else if (lencmp == 0) {
// we don't need defaults. names were used, so this application is transformed
// into a block (@see transformNamedApplication in NamesDefaults)
val (namelessArgs, argPos) = removeNames(Typer.this)(args, params)
if (namelessArgs exists (_.isErroneous)) {
duplErrTree
} else if (!isIdentity(argPos) && !sameLength(formals, params))
// !isIdentity indicates that named arguments are used to re-order arguments
duplErrorTree(MultipleVarargError(tree))
else if (isIdentity(argPos) && !isNamedApplyBlock(fun)) {
// if there's no re-ordering, and fun is not transformed, no need to transform
// more than an optimization, e.g. important in "synchronized { x = update-x }"
checkNotMacro()
doTypedApply(tree, fun, namelessArgs, mode, pt)
} else {
checkNotMacro()
transformNamedApplication(Typer.this, mode, pt)(
treeCopy.Apply(tree, fun, namelessArgs), argPos)
}
} else {
// defaults are needed. they are added to the argument list in named style as
// calls to the default getters. Example:
// foo[Int](a)() ==> foo[Int](a)(b = foo$qual.foo$default$2[Int](a))
checkNotMacro()
val fun1 = transformNamedApplication(Typer.this, mode, pt)(fun, x => x)
if (fun1.isErroneous) duplErrTree
else {
assert(isNamedApplyBlock(fun1), fun1)
val NamedApplyInfo(qual, targs, previousArgss, _) = context.namedApplyBlockInfo.get._2
val blockIsEmpty = fun1 match {
case Block(Nil, _) =>
// if the block does not have any ValDef we can remove it. Note that the call to
// "transformNamedApplication" is always needed in order to obtain targs/previousArgss
context.namedApplyBlockInfo = None
true
case _ => false
}
val (allArgs, missing) = addDefaults(args, qual, targs, previousArgss, params, fun.pos.focus, context)
val funSym = fun1 match { case Block(_, expr) => expr.symbol }
val lencmp2 = compareLengths(allArgs, formals)
if (!sameLength(allArgs, args) && callToCompanionConstr(context, funSym)) {
duplErrorTree(ModuleUsingCompanionClassDefaultArgsErrror(tree))
} else if (lencmp2 > 0) {
removeNames(Typer.this)(allArgs, params) // #3818
duplErrTree
} else if (lencmp2 == 0) {
// useful when a default doesn't match parameter type, e.g. def f[T](x:T="a"); f[Int]()
val note = "Error occurred in an application involving default arguments."
if (!(context.diagnostic contains note)) context.diagnostic = note :: context.diagnostic
doTypedApply(tree, if (blockIsEmpty) fun else fun1, allArgs, mode, pt)
} else {
tryTupleApply getOrElse duplErrorTree(NotEnoughArgsError(tree, fun, missing))
}
}
}
}
if (!sameLength(formals, args) || // wrong nb of arguments
(args exists isNamed) || // uses a named argument
isNamedApplyBlock(fun)) { // fun was transformed to a named apply block =>
// integrate this application into the block
if (dyna.isApplyDynamicNamed(fun)) dyna.typedNamedApply(tree, fun, args, mode, pt)
else tryNamesDefaults
} else {
val tparams = context.extractUndetparams()
if (tparams.isEmpty) { // all type params are defined
// In order for checkDead not to be misled by the unfortunate special
// case of AnyRef#synchronized (which is implemented with signature T => T
// but behaves as if it were (=> T) => T) we need to know what is the actual
// target of a call. Since this information is no longer available from
// typedArg, it is recorded here.
checkDead.updateExpr(fun)
val args1 = typedArgs(args, forArgMode(fun, mode), paramTypes, formals)
// instantiate dependent method types, must preserve singleton types where possible (stableTypeFor) -- example use case:
// val foo = "foo"; def precise(x: String)(y: x.type): x.type = {...}; val bar : foo.type = precise(foo)(foo)
// precise(foo) : foo.type => foo.type
val restpe = mt.resultType(args1 map (arg => gen.stableTypeFor(arg) getOrElse arg.tpe))
def ifPatternSkipFormals(tp: Type) = tp match {
case MethodType(_, rtp) if (inPatternMode(mode)) => rtp
case _ => tp
}
// Replace the Delegate-Chainer methods += and -= with corresponding
// + and - calls, which are translated in the code generator into
// Combine and Remove
if (forMSIL) {
fun match {
case Select(qual, name) =>
if (isSubType(qual.tpe, DelegateClass.tpe)
&& (name == encode("+=") || name == encode("-=")))
{
val n = if (name == encode("+=")) nme.PLUS else nme.MINUS
val f = Select(qual, n)
// the compiler thinks, the PLUS method takes only one argument,
// but he thinks it's an instance method -> still two ref's on the stack
// -> translated by backend
val rhs = treeCopy.Apply(tree, f, args)
return typed(Assign(qual, rhs))
}
case _ => ()
}
}
/** This is translating uses of List() into Nil. This is less
* than ideal from a consistency standpoint, but it shouldn't be
* altered without due caution.
* ... this also causes bootstrapping cycles if List_apply is
* forced during kind-arity checking, so it is guarded by additional
* tests to ensure we're sufficiently far along.
*/
if (args.isEmpty && !forInteractive && fun.symbol.isInitialized && ListModule.hasCompleteInfo && (fun.symbol == List_apply))
atPos(tree.pos)(gen.mkNil setType restpe)
else
constfold(treeCopy.Apply(tree, fun, args1) setType ifPatternSkipFormals(restpe))
} else if (needsInstantiation(tparams, formals, args)) {
//println("needs inst "+fun+" "+tparams+"/"+(tparams map (_.info)))
inferExprInstance(fun, tparams)
doTypedApply(tree, fun, args, mode, pt)
} else {
assert(!inPatternMode(mode), modeString(mode)) // this case cannot arise for patterns
val lenientTargs = protoTypeArgs(tparams, formals, mt.resultApprox, pt)
val strictTargs = map2(lenientTargs, tparams)((targ, tparam) =>
if (targ == WildcardType) tparam.tpeHK else targ)
var remainingParams = paramTypes
def typedArgToPoly(arg: Tree, formal: Type): Tree = { //TR TODO: cleanup
val lenientPt = formal.instantiateTypeParams(tparams, lenientTargs)
val newmode =
if (isByNameParamType(remainingParams.head)) POLYmode
else POLYmode | BYVALmode
if (remainingParams.tail.nonEmpty) remainingParams = remainingParams.tail
val arg1 = typedArg(arg, forArgMode(fun, mode), newmode, lenientPt)
val argtparams = context.extractUndetparams()
if (!argtparams.isEmpty) {
val strictPt = formal.instantiateTypeParams(tparams, strictTargs)
inferArgumentInstance(arg1, argtparams, strictPt, lenientPt)
arg1
} else arg1
}
val args1 = map2(args, formals)(typedArgToPoly)
if (args1 exists {_.isErrorTyped}) duplErrTree
else {
debuglog("infer method inst "+fun+", tparams = "+tparams+", args = "+args1.map(_.tpe)+", pt = "+pt+", lobounds = "+tparams.map(_.tpe.bounds.lo)+", parambounds = "+tparams.map(_.info)) //debug
// define the undetparams which have been fixed by this param list, replace the corresponding symbols in "fun"
// returns those undetparams which have not been instantiated.
val undetparams = inferMethodInstance(fun, tparams, args1, pt)
val result = doTypedApply(tree, fun, args1, mode, pt)
context.undetparams = undetparams
result
}
}
}
case SingleType(_, _) =>
doTypedApply(tree, fun setType fun.tpe.widen, args, mode, pt)
case ErrorType =>
if (!tree.isErrorTyped) setError(tree) else tree
// @H change to setError(treeCopy.Apply(tree, fun, args))
/* --- begin unapply --- */
case otpe if inPatternMode(mode) && unapplyMember(otpe).exists =>
if (args.length > MaxTupleArity)
return duplErrorTree(TooManyArgsPatternError(fun))
//
def freshArgType(tp: Type): (List[Symbol], Type) = tp match {
case MethodType(param :: _, _) =>
(Nil, param.tpe)
case PolyType(tparams, restpe) =>
createFromClonedSymbols(tparams, freshArgType(restpe)._2)((ps, t) => ((ps, t)))
// No longer used, see test case neg/t960.scala (#960 has nothing to do with it)
case OverloadedType(_, _) =>
OverloadedUnapplyError(fun)
(Nil, ErrorType)
case _ =>
UnapplyWithSingleArgError(fun)
(Nil, ErrorType)
}
val unapp = unapplyMember(otpe)
val unappType = otpe.memberType(unapp)
val argDummy = context.owner.newValue(nme.SELECTOR_DUMMY, fun.pos, SYNTHETIC) setInfo pt
val arg = Ident(argDummy) setType pt
if (!isApplicableSafe(Nil, unappType, List(pt), WildcardType)) {
//Console.println("UNAPP: need to typetest, arg.tpe = "+arg.tpe+", unappType = "+unappType)
val (freeVars, unappFormal) = freshArgType(unappType.skolemizeExistential(context.owner, tree))
val unapplyContext = context.makeNewScope(context.tree, context.owner)
freeVars foreach unapplyContext.scope.enter
val typer1 = newTyper(unapplyContext)
val pattp = typer1.infer.inferTypedPattern(tree, unappFormal, arg.tpe)
// turn any unresolved type variables in freevars into existential skolems
val skolems = freeVars map (fv => unapplyContext.owner.newExistentialSkolem(fv, fv))
arg.tpe = pattp.substSym(freeVars, skolems)
argDummy setInfo arg.tpe
}
// setType null is necessary so that ref will be stabilized; see bug 881
val fun1 = typedPos(fun.pos)(Apply(Select(fun setType null, unapp), List(arg)))
if (fun1.tpe.isErroneous) {
duplErrTree
} else {
val formals0 = unapplyTypeList(fun1.symbol, fun1.tpe)
val formals1 = formalTypes(formals0, args.length)
if (sameLength(formals1, args)) {
val args1 = typedArgs(args, mode, formals0, formals1)
// This used to be the following (failing) assert:
// assert(isFullyDefined(pt), tree+" ==> "+UnApply(fun1, args1)+", pt = "+pt)
// I modified as follows. See SI-1048.
val pt1 = if (isFullyDefined(pt)) pt else makeFullyDefined(pt)
val itype = glb(List(pt1, arg.tpe))
arg.tpe = pt1 // restore type (arg is a dummy tree, just needs to pass typechecking)
UnApply(fun1, args1) setPos tree.pos setType itype
} else
duplErrorTree(WrongNumberArgsPatternError(tree, fun))
}
/* --- end unapply --- */
case _ =>
duplErrorTree(ApplyWithoutArgsError(tree, fun))
}
}
/**
* Convert an annotation constructor call into an AnnotationInfo.
*
* @param annClass the expected annotation class
*/
def typedAnnotation(ann: Tree, mode: Int = EXPRmode, selfsym: Symbol = NoSymbol, annClass: Symbol = AnnotationClass, requireJava: Boolean = false): AnnotationInfo = {
lazy val annotationError = AnnotationInfo(ErrorType, Nil, Nil)
var hasError: Boolean = false
val pending = ListBuffer[AbsTypeError]()
def reportAnnotationError(err: AbsTypeError) = {
pending += err
hasError = true
annotationError
}
/** Calling constfold right here is necessary because some trees (negated
* floats and literals in particular) are not yet folded.
*/
def tryConst(tr: Tree, pt: Type): Option[LiteralAnnotArg] = {
val const: Constant = typed(constfold(tr), EXPRmode, pt) match {
case l @ Literal(c) if !l.isErroneous => c
case tree => tree.tpe match {
case ConstantType(c) => c
case tpe => null
}
}
if (const == null) {
reportAnnotationError(AnnotationNotAConstantError(tr)); None
} else if (const.value == null) {
reportAnnotationError(AnnotationArgNullError(tr)); None
} else
Some(LiteralAnnotArg(const))
}
/** Converts an untyped tree to a ClassfileAnnotArg. If the conversion fails,
* an error message is reported and None is returned.
*/
def tree2ConstArg(tree: Tree, pt: Type): Option[ClassfileAnnotArg] = tree match {
case Apply(Select(New(tpt), nme.CONSTRUCTOR), args) if (pt.typeSymbol == ArrayClass) =>
reportAnnotationError(ArrayConstantsError(tree)); None
case ann @ Apply(Select(New(tpt), nme.CONSTRUCTOR), args) =>
val annInfo = typedAnnotation(ann, mode, NoSymbol, pt.typeSymbol, true)
if (annInfo.atp.isErroneous) { hasError = true; None }
else Some(NestedAnnotArg(annInfo))
// use of Array.apply[T: ArrayTag](xs: T*): Array[T]
// and Array.apply(x: Int, xs: Int*): Array[Int] (and similar)
case Apply(fun, args) =>
val typedFun = typed(fun, forFunMode(mode), WildcardType)
if (typedFun.symbol.owner == ArrayModule.moduleClass && typedFun.symbol.name == nme.apply)
pt match {
case TypeRef(_, ArrayClass, targ :: _) =>
trees2ConstArg(args, targ)
case _ =>
// For classfile annotations, pt can only be T:
// BT = Int, .., String, Class[_], JavaAnnotClass
// T = BT | Array[BT]
// So an array literal as argument can only be valid if pt is Array[_]
reportAnnotationError(ArrayConstantsTypeMismatchError(tree, pt))
None
}
else tryConst(tree, pt)
case Typed(t, _) =>
tree2ConstArg(t, pt)
case tree =>
tryConst(tree, pt)
}
def trees2ConstArg(trees: List[Tree], pt: Type): Option[ArrayAnnotArg] = {
val args = trees.map(tree2ConstArg(_, pt))
if (args.exists(_.isEmpty)) None
else Some(ArrayAnnotArg(args.flatten.toArray))
}
// begin typedAnnotation
val (fun, argss) = {
def extract(fun: Tree, outerArgss: List[List[Tree]]):
(Tree, List[List[Tree]]) = fun match {
case Apply(f, args) =>
extract(f, args :: outerArgss)
case Select(New(tpt), nme.CONSTRUCTOR) =>
(fun, outerArgss)
case _ =>
reportAnnotationError(UnexpectedTreeAnnotation(fun))
(setError(fun), outerArgss)
}
extract(ann, List())
}
val res = if (fun.isErroneous) annotationError
else {
val typedFun @ Select(New(tpt), _) = typed(fun, forFunMode(mode), WildcardType)
val annType = tpt.tpe
if (typedFun.isErroneous) annotationError
else if (annType.typeSymbol isNonBottomSubClass ClassfileAnnotationClass) {
// annotation to be saved as java classfile annotation
val isJava = typedFun.symbol.owner.isJavaDefined
if (!annType.typeSymbol.isNonBottomSubClass(annClass)) {
reportAnnotationError(AnnotationTypeMismatchError(tpt, annClass.tpe, annType))
} else if (argss.length > 1) {
reportAnnotationError(MultipleArgumentListForAnnotationError(ann))
} else {
val args =
if (argss.head.length == 1 && !isNamed(argss.head.head))
List(new AssignOrNamedArg(Ident(nme.value), argss.head.head))
else argss.head
val annScope = annType.decls
.filter(sym => sym.isMethod && !sym.isConstructor && sym.isJavaDefined)
val names = new collection.mutable.HashSet[Symbol]
names ++= (if (isJava) annScope.iterator
else typedFun.tpe.params.iterator)
val nvPairs = args map {
case arg @ AssignOrNamedArg(Ident(name), rhs) =>
val sym = if (isJava) annScope.lookup(name)
else typedFun.tpe.params.find(p => p.name == name).getOrElse(NoSymbol)
if (sym == NoSymbol) {
reportAnnotationError(UnknownAnnotationNameError(arg, name))
(nme.ERROR, None)
} else if (!names.contains(sym)) {
reportAnnotationError(DuplicateValueAnnotationError(arg, name))
(nme.ERROR, None)
} else {
names -= sym
if (isJava) sym.cookJavaRawInfo() // #3429
val annArg = tree2ConstArg(rhs, sym.tpe.resultType)
(sym.name, annArg)
}
case arg =>
reportAnnotationError(ClassfileAnnotationsAsNamedArgsError(arg))
(nme.ERROR, None)
}
for (sym <- names) {
// make sure the flags are up to date before erroring (jvm/t3415 fails otherwise)
sym.initialize
if (!sym.hasAnnotation(AnnotationDefaultAttr) && !sym.hasDefault)
reportAnnotationError(AnnotationMissingArgError(ann, annType, sym))
}
if (hasError) annotationError
else AnnotationInfo(annType, List(), nvPairs map {p => (p._1.asInstanceOf[Name], p._2.get)}).setOriginal(Apply(typedFun, args).setPos(ann.pos)) // [Eugene+] why do we need this cast?
}
} else if (requireJava) {
reportAnnotationError(NestedAnnotationError(ann, annType))
} else {
val typedAnn = if (selfsym == NoSymbol) {
// local dummy fixes SI-5544
val localTyper = newTyper(context.make(ann, context.owner.newLocalDummy(ann.pos)))
localTyper.typed(ann, mode, annClass.tpe)
} else {
// Since a selfsym is supplied, the annotation should have
// an extra "self" identifier in scope for type checking.
// This is implemented by wrapping the rhs
// in a function like "self => rhs" during type checking,
// and then stripping the "self =>" and substituting
// in the supplied selfsym.
val funcparm = ValDef(NoMods, nme.self, TypeTree(selfsym.info), EmptyTree)
val func = Function(List(funcparm), ann.duplicate)
// The .duplicate of annot.constr
// deals with problems that
// accur if this annotation is
// later typed again, which
// the compiler sometimes does.
// The problem is that "self"
// ident's within annot.constr
// will retain the old symbol
// from the previous typing.
val fun1clazz = FunctionClass(1)
val funcType = typeRef(fun1clazz.tpe.prefix,
fun1clazz,
List(selfsym.info, annClass.tpe))
(typed(func, mode, funcType): @unchecked) match {
case t @ Function(List(arg), rhs) =>
val subs =
new TreeSymSubstituter(List(arg.symbol),List(selfsym))
subs(rhs)
}
}
def annInfo(t: Tree): AnnotationInfo = t match {
case Apply(Select(New(tpt), nme.CONSTRUCTOR), args) =>
AnnotationInfo(annType, args, List()).setOriginal(typedAnn).setPos(t.pos)
case Block(stats, expr) =>
context.warning(t.pos, "Usage of named or default arguments transformed this annotation\n"+
"constructor call into a block. The corresponding AnnotationInfo\n"+
"will contain references to local values and default getters instead\n"+
"of the actual argument trees")
annInfo(expr)
case Apply(fun, args) =>
context.warning(t.pos, "Implementation limitation: multiple argument lists on annotations are\n"+
"currently not supported; ignoring arguments "+ args)
annInfo(fun)
case _ =>
reportAnnotationError(UnexpectedTreeAnnotationError(t, typedAnn))
}
if (annType.typeSymbol == DeprecatedAttr && argss.flatten.size < 2)
unit.deprecationWarning(ann.pos, "@deprecated now takes two arguments; see the scaladoc.")
if ((typedAnn.tpe == null) || typedAnn.tpe.isErroneous) annotationError
else annInfo(typedAnn)
}
}
if (hasError) {
pending.foreach(ErrorUtils.issueTypeError)
annotationError
} else res
}
def isRawParameter(sym: Symbol) = // is it a type parameter leaked by a raw type?
sym.isTypeParameter && sym.owner.isJavaDefined
/** If we map a set of hidden symbols to their existential bounds, we
* have a problem: the bounds may themselves contain references to the
* hidden symbols. So this recursively calls existentialBound until
* the typeSymbol is not amongst the symbols being hidden.
*/
def existentialBoundsExcludingHidden(hidden: List[Symbol]): Map[Symbol, Type] = {
def safeBound(t: Type): Type =
if (hidden contains t.typeSymbol) safeBound(t.typeSymbol.existentialBound.bounds.hi) else t
def hiBound(s: Symbol): Type = safeBound(s.existentialBound.bounds.hi) match {
case tp @ RefinedType(parents, decls) =>
val parents1 = parents mapConserve safeBound
if (parents eq parents1) tp
else copyRefinedType(tp, parents1, decls)
case tp => tp
}
// Hanging onto lower bound in case anything interesting
// happens with it.
mapFrom(hidden)(s => s.existentialBound match {
case TypeBounds(lo, hi) => TypeBounds(lo, hiBound(s))
case _ => hiBound(s)
})
}
/** Given a set `rawSyms` of term- and type-symbols, and a type
* `tp`, produce a set of fresh type parameters and a type so that
* it can be abstracted to an existential type. Every type symbol
* `T` in `rawSyms` is mapped to a clone. Every term symbol `x` of
* type `T` in `rawSyms` is given an associated type symbol of the
* following form:
*
* type x.type <: T with Singleton
*
* The name of the type parameter is `x.type`, to produce nice
* diagnostics. The Singleton parent ensures that the type
* parameter is still seen as a stable type. Type symbols in
* rawSyms are fully replaced by the new symbols. Term symbols are
* also replaced, except for term symbols of an Ident tree, where
* only the type of the Ident is changed.
*/
protected def existentialTransform[T](rawSyms: List[Symbol], tp: Type)(creator: (List[Symbol], Type) => T): T = {
val allBounds = existentialBoundsExcludingHidden(rawSyms)
val typeParams: List[Symbol] = rawSyms map { sym =>
val name = sym.name match {
case x: TypeName => x
case x => tpnme.singletonName(x)
}
val bound = allBounds(sym)
val sowner = if (isRawParameter(sym)) context.owner else sym.owner
val quantified = sowner.newExistential(name, sym.pos)
quantified setInfo bound.cloneInfo(quantified)
}
// Higher-kinded existentials are not yet supported, but this is
// tpeHK for when they are: "if a type constructor is expected/allowed,
// tpeHK must be called instead of tpe."
val typeParamTypes = typeParams map (_.tpeHK)
def doSubst(info: Type) = info.subst(rawSyms, typeParamTypes)
creator(typeParams map (_ modifyInfo doSubst), doSubst(tp))
}
/** Compute an existential type from raw hidden symbols `syms` and type `tp`
*/
def packSymbols(hidden: List[Symbol], tp: Type): Type =
if (hidden.isEmpty) tp
else existentialTransform(hidden, tp)(existentialAbstraction)
def isReferencedFrom(ctx: Context, sym: Symbol): Boolean =
ctx.owner.isTerm &&
(ctx.scope.exists { dcl => dcl.isInitialized && (dcl.info contains sym) }) ||
{
var ctx1 = ctx.outer
while ((ctx1 != NoContext) && (ctx1.scope eq ctx.scope)) ctx1 = ctx1.outer
(ctx1 != NoContext) && isReferencedFrom(ctx1, sym)
}
def isCapturedExistential(sym: Symbol) =
(sym hasAllFlags (EXISTENTIAL | CAPTURED)) && {
val start = startTimer(isReferencedNanos)
try !isReferencedFrom(context, sym)
finally stopTimer(isReferencedNanos, start)
}
def packCaptured(tpe: Type): Type = {
val captured = mutable.Set[Symbol]()
for (tp <- tpe)
if (isCapturedExistential(tp.typeSymbol))
captured += tp.typeSymbol
existentialAbstraction(captured.toList, tpe)
}
/** convert local symbols and skolems to existentials */
def packedType(tree: Tree, owner: Symbol): Type = {
def defines(tree: Tree, sym: Symbol) =
sym.isExistentialSkolem && sym.unpackLocation == tree ||
tree.isDef && tree.symbol == sym
def isVisibleParameter(sym: Symbol) =
sym.isParameter && (sym.owner == owner) && (sym.isType || !owner.isAnonymousFunction)
def containsDef(owner: Symbol, sym: Symbol): Boolean =
(!sym.hasPackageFlag) && {
var o = sym.owner
while (o != owner && o != NoSymbol && !o.hasPackageFlag) o = o.owner
o == owner && !isVisibleParameter(sym)
}
var localSyms = collection.immutable.Set[Symbol]()
var boundSyms = collection.immutable.Set[Symbol]()
def isLocal(sym: Symbol): Boolean =
if (sym == NoSymbol || sym.isRefinementClass || sym.isLocalDummy) false
else if (owner == NoSymbol) tree exists (defines(_, sym))
else containsDef(owner, sym) || isRawParameter(sym) || isCapturedExistential(sym)
def containsLocal(tp: Type): Boolean =
tp exists (t => isLocal(t.typeSymbol) || isLocal(t.termSymbol))
val normalizeLocals = new TypeMap {
def apply(tp: Type): Type = tp match {
case TypeRef(pre, sym, args) =>
if (sym.isAliasType && containsLocal(tp)) apply(tp.normalize)
else {
if (pre.isVolatile)
InferTypeWithVolatileTypeSelectionError(tree, pre)
mapOver(tp)
}
case _ =>
mapOver(tp)
}
}
// add all local symbols of `tp` to `localSyms`
// TODO: expand higher-kinded types into individual copies for each instance.
def addLocals(tp: Type) {
val remainingSyms = new ListBuffer[Symbol]
def addIfLocal(sym: Symbol, tp: Type) {
if (isLocal(sym) && !localSyms(sym) && !boundSyms(sym)) {
if (sym.typeParams.isEmpty) {
localSyms += sym
remainingSyms += sym
} else {
AbstractExistentiallyOverParamerizedTpeError(tree, tp)
}
}
}
for (t <- tp) {
t match {
case ExistentialType(tparams, _) =>
boundSyms ++= tparams
case AnnotatedType(annots, _, _) =>
for (annot <- annots; arg <- annot.args) {
arg match {
case Ident(_) =>
// Check the symbol of an Ident, unless the
// Ident's type is already over an existential.
// (If the type is already over an existential,
// then remap the type, not the core symbol.)
if (!arg.tpe.typeSymbol.hasFlag(EXISTENTIAL))
addIfLocal(arg.symbol, arg.tpe)
case _ => ()
}
}
case _ =>
}
addIfLocal(t.termSymbol, t)
addIfLocal(t.typeSymbol, t)
}
for (sym <- remainingSyms) addLocals(sym.existentialBound)
}
val normalizedTpe = normalizeLocals(tree.tpe)
addLocals(normalizedTpe)
packSymbols(localSyms.toList, normalizedTpe)
}
def typedClassOf(tree: Tree, tpt: Tree, noGen: Boolean = false) =
if (!checkClassType(tpt) && noGen) tpt
else atPos(tree.pos)(gen.mkClassOf(tpt.tpe))
protected def typedExistentialTypeTree(tree: ExistentialTypeTree, mode: Int): Tree = {
for (wc <- tree.whereClauses)
if (wc.symbol == NoSymbol) { namer.enterSym(wc); wc.symbol setFlag EXISTENTIAL }
else context.scope enter wc.symbol
val whereClauses1 = typedStats(tree.whereClauses, context.owner)
for (vd @ ValDef(_, _, _, _) <- tree.whereClauses)
if (vd.symbol.tpe.isVolatile)
AbstractionFromVolatileTypeError(vd)
val tpt1 = typedType(tree.tpt, mode)
existentialTransform(tree.whereClauses map (_.symbol), tpt1.tpe)((tparams, tp) =>
TypeTree(newExistentialType(tparams, tp)) setOriginal tree
)
}
// lifted out of typed1 because it's needed in typedImplicit0
protected def typedTypeApply(tree: Tree, mode: Int, fun: Tree, args: List[Tree]): Tree = fun.tpe match {
case OverloadedType(pre, alts) =>
inferPolyAlternatives(fun, args map (_.tpe))
val tparams = fun.symbol.typeParams //@M TODO: fun.symbol.info.typeParams ? (as in typedAppliedTypeTree)
val args1 = if (sameLength(args, tparams)) {
//@M: in case TypeApply we can't check the kind-arities of the type arguments,
// as we don't know which alternative to choose... here we do
map2Conserve(args, tparams) {
//@M! the polytype denotes the expected kind
(arg, tparam) => typedHigherKindedType(arg, mode, GenPolyType(tparam.typeParams, AnyClass.tpe))
}
} else // @M: there's probably something wrong when args.length != tparams.length... (triggered by bug #320)
// Martin, I'm using fake trees, because, if you use args or arg.map(typedType),
// inferPolyAlternatives loops... -- I have no idea why :-(
// ...actually this was looping anyway, see bug #278.
return TypedApplyWrongNumberOfTpeParametersError(fun, fun)
typedTypeApply(tree, mode, fun, args1)
case SingleType(_, _) =>
typedTypeApply(tree, mode, fun setType fun.tpe.widen, args)
case PolyType(tparams, restpe) if tparams.nonEmpty =>
if (sameLength(tparams, args)) {
val targs = args map (_.tpe)
checkBounds(tree, NoPrefix, NoSymbol, tparams, targs, "")
if (fun.symbol == Predef_classOf)
typedClassOf(tree, args.head, true)
else {
if (!isPastTyper && fun.symbol == Any_isInstanceOf && !targs.isEmpty)
checkCheckable(tree, targs.head, "")
val resultpe = restpe.instantiateTypeParams(tparams, targs)
//@M substitution in instantiateParams needs to be careful!
//@M example: class Foo[a] { def foo[m[x]]: m[a] = error("") } (new Foo[Int]).foo[List] : List[Int]
//@M --> first, m[a] gets changed to m[Int], then m gets substituted for List,
// this must preserve m's type argument, so that we end up with List[Int], and not List[a]
//@M related bug: #1438
//println("instantiating type params "+restpe+" "+tparams+" "+targs+" = "+resultpe)
treeCopy.TypeApply(tree, fun, args) setType resultpe
}
} else {
TypedApplyWrongNumberOfTpeParametersError(tree, fun)
}
case ErrorType =>
setError(treeCopy.TypeApply(tree, fun, args))
case _ =>
fun match {
// drop the application for an applyDynamic or selectDynamic call since it has been pushed down
case treeInfo.DynamicApplication(_, _) => fun
case _ => TypedApplyDoesNotTakeTpeParametersError(tree, fun)
}
}
object dyna {
import treeInfo.{isApplyDynamicName, DynamicUpdate, DynamicApplicationNamed}
def acceptsApplyDynamic(tp: Type) = tp.typeSymbol isNonBottomSubClass DynamicClass
/** Returns `Some(t)` if `name` can be selected dynamically on `qual`, `None` if not.
* `t` specifies the type to be passed to the applyDynamic/selectDynamic call (unless it is NoType)
* NOTE: currently either returns None or Some(NoType) (scala-virtualized extends this to Some(t) for selections on staged Structs)
*/
def acceptsApplyDynamicWithType(qual: Tree, name: Name): Option[Type] =
// don't selectDynamic selectDynamic, do select dynamic at unknown type,
// in scala-virtualized, we may return a Some(tp) where tp ne NoType
if (!isApplyDynamicName(name) && acceptsApplyDynamic(qual.tpe.widen)) Some(NoType)
else None
def isDynamicallyUpdatable(tree: Tree) = tree match {
case DynamicUpdate(qual, name) =>
// if the qualifier is a Dynamic, that's all we need to know
acceptsApplyDynamic(qual.tpe)
case _ => false
}
def isApplyDynamicNamed(fun: Tree): Boolean = fun match {
case DynamicApplicationNamed(qual, _) if acceptsApplyDynamic(qual.tpe.widen) => true
case _ => false
// look deeper?
// val methPart = treeInfo.methPart(fun)
// println("methPart of "+ fun +" is "+ methPart)
// if (methPart ne fun) isApplyDynamicNamed(methPart)
// else false
}
def typedNamedApply(orig: Tree, fun: Tree, args: List[Tree], mode: Int, pt: Type): Tree = {
def argToBinding(arg: Tree): Tree = arg match {
case AssignOrNamedArg(Ident(name), rhs) => gen.mkTuple(List(CODE.LIT(name.toString), rhs))
case _ => gen.mkTuple(List(CODE.LIT(""), arg))
}
typed(treeCopy.Apply(orig, fun, args map argToBinding), mode, pt)
}
/** Translate selection that does not typecheck according to the normal rules into a selectDynamic/applyDynamic.
*
* foo.method("blah") ~~> foo.applyDynamic("method")("blah")
* foo.method(x = "blah") ~~> foo.applyDynamicNamed("method")(("x", "blah"))
* foo.varia = 10 ~~> foo.updateDynamic("varia")(10)
* foo.field ~~> foo.selectDynamic("field")
* foo.arr(10) = 13 ~~> foo.selectDynamic("arr").update(10, 13)
*
* what if we want foo.field == foo.selectDynamic("field") == 1, but `foo.field = 10` == `foo.selectDynamic("field").update(10)` == ()
* what would the signature for selectDynamic be? (hint: it needs to depend on whether an update call is coming or not)
*
* need to distinguish selectDynamic and applyDynamic somehow: the former must return the selected value, the latter must accept an apply or an update
* - could have only selectDynamic and pass it a boolean whether more is to come,
* so that it can either return the bare value or something that can handle the apply/update
* HOWEVER that makes it hard to return unrelated values for the two cases
* --> selectDynamic's return type is now dependent on the boolean flag whether more is to come
* - simplest solution: have two method calls
*
*/
def mkInvoke(cxTree: Tree, tree: Tree, qual: Tree, name: Name): Option[Tree] =
acceptsApplyDynamicWithType(qual, name) map { tp =>
// tp eq NoType => can call xxxDynamic, but not passing any type args (unless specified explicitly by the user)
// in scala-virtualized, when not NoType, tp is passed as type argument (for selection on a staged Struct)
// strip off type application -- we're not doing much with outer, so don't bother preserving cxTree's attributes etc
val (outer, explicitTargs) = cxTree match {
case TypeApply(fun, targs) => (fun, targs)
case Apply(TypeApply(fun, targs), args) => (Apply(fun, args), targs)
case t => (t, Nil)
}
@inline def hasNamedArg(as: List[Tree]) = as collectFirst {case AssignOrNamedArg(lhs, rhs) =>} nonEmpty
// note: context.tree includes at most one Apply node
// thus, we can't use it to detect we're going to receive named args in expressions such as:
// qual.sel(a)(a2, arg2 = "a2")
val oper = outer match {
case Apply(`tree`, as) =>
val oper =
if (hasNamedArg(as)) nme.applyDynamicNamed
else nme.applyDynamic
// not supported: foo.bar(a1,..., an: _*)
if (treeInfo.isWildcardStarArgList(as)) {
DynamicVarArgUnsupported(tree, oper)
return Some(setError(tree))
} else oper
case Assign(`tree`, _) => nme.updateDynamic
case _ => nme.selectDynamic
}
val dynSel = Select(qual, oper)
val tappSel = if (explicitTargs nonEmpty) TypeApply(dynSel, explicitTargs) else dynSel
atPos(qual.pos)(Apply(tappSel, List(Literal(Constant(name.decode)))))
}
}
@inline final def deindentTyping() = context.typingIndentLevel -= 2
@inline final def indentTyping() = context.typingIndentLevel += 2
@inline final def printTyping(s: => String) = {
if (printTypings)
println(context.typingIndent + s.replaceAll("\n", "\n" + context.typingIndent))
}
@inline final def printInference(s: => String) = {
if (printInfers)
println(s)
}
def typed1(tree: Tree, mode: Int, pt: Type): Tree = {
def isPatternMode = inPatternMode(mode)
//Console.println("typed1("+tree.getClass()+","+Integer.toHexString(mode)+","+pt+")")
//@M! get the type of the qualifier in a Select tree, otherwise: NoType
def prefixType(fun: Tree): Type = fun match {
case Select(qualifier, _) => qualifier.tpe
// case Ident(name) => ??
case _ => NoType
}
def typedAnnotated(ann: Tree, arg1: Tree): Tree = {
/** mode for typing the annotation itself */
val annotMode = mode & ~TYPEmode | EXPRmode
def resultingTypeTree(tpe: Type) = {
// we need symbol-ful originals for reification
// hence we go the extra mile to hand-craft tis guy
val original =
if (arg1.isType)
arg1 match {
case tt @ TypeTree() => Annotated(ann, tt.original)
// this clause is needed to correctly compile stuff like "new C @D" or "@(inline @getter)"
case _ => Annotated(ann, arg1)
}
else
tree
original setType ann.tpe
TypeTree(tpe) setOriginal original setPos tree.pos.focus
}
if (arg1.isType) {
// make sure the annotation is only typechecked once
if (ann.tpe == null) {
// an annotated type
val selfsym =
if (!settings.selfInAnnots.value)
NoSymbol
else
arg1.tpe.selfsym orElse {
/* Implementation limitation: Currently this
* can cause cyclical reference errors even
* when the self symbol is not referenced at all.
* Surely at least some of these cases can be
* fixed by proper use of LazyType's. Lex tinkered
* on this but did not succeed, so is leaving
* it alone for now. Example code with the problem:
* class peer extends Annotation
* class NPE[T <: NPE[T] @peer]
*
* (Note: -Yself-in-annots must be on to see the problem)
* */
( context.owner
newLocalDummy (ann.pos)
newValue (nme.self, ann.pos)
setInfo (arg1.tpe.withoutAnnotations)
)
}
val ainfo = typedAnnotation(ann, annotMode, selfsym)
val atype0 = arg1.tpe.withAnnotation(ainfo)
val atype =
if ((selfsym != NoSymbol) && (ainfo.refsSymbol(selfsym)))
atype0.withSelfsym(selfsym)
else
atype0 // do not record selfsym if
// this annotation did not need it
if (ainfo.isErroneous)
// Erroneous annotations were already reported in typedAnnotation
arg1 // simply drop erroneous annotations
else {
ann.tpe = atype
resultingTypeTree(atype)
}
} else {
// the annotation was typechecked before
resultingTypeTree(ann.tpe)
}
}
else {
if (ann.tpe == null) {
val annotInfo = typedAnnotation(ann, annotMode)
ann.tpe = arg1.tpe.withAnnotation(annotInfo)
}
val atype = ann.tpe
Typed(arg1, resultingTypeTree(atype)) setPos tree.pos setType atype
}
}
def typedBind(name: Name, body: Tree) = {
var vble = tree.symbol
def typedBindType(name: TypeName) = {
assert(body == EmptyTree, context.unit + " typedBind: " + name.debugString + " " + body + " " + body.getClass)
if (vble == NoSymbol)
vble =
if (isFullyDefined(pt))
context.owner.newAliasType(name, tree.pos) setInfo pt
else
context.owner.newAbstractType(name, tree.pos) setInfo TypeBounds.empty
val rawInfo = vble.rawInfo
vble = if (vble.name == tpnme.WILDCARD) context.scope.enter(vble)
else namer.enterInScope(vble)
tree setSymbol vble setType vble.tpe
}
def typedBindTerm(name: TermName) = {
if (vble == NoSymbol)
vble = context.owner.newValue(name, tree.pos)
if (vble.name.toTermName != nme.WILDCARD) {
if ((mode & ALTmode) != 0)
VariableInPatternAlternativeError(tree)
vble = namer.enterInScope(vble)
}
val body1 = typed(body, mode, pt)
vble.setInfo(
if (treeInfo.isSequenceValued(body)) seqType(body1.tpe)
else body1.tpe)
treeCopy.Bind(tree, name, body1) setSymbol vble setType body1.tpe // burak, was: pt
}
name match {
case x: TypeName => typedBindType(x)
case x: TermName => typedBindTerm(x)
}
}
def typedArrayValue(elemtpt: Tree, elems: List[Tree]) = {
val elemtpt1 = typedType(elemtpt, mode)
val elems1 = elems mapConserve (elem => typed(elem, mode, elemtpt1.tpe))
treeCopy.ArrayValue(tree, elemtpt1, elems1)
.setType(
(if (isFullyDefined(pt) && !phase.erasedTypes) pt
else arrayType(elemtpt1.tpe)).notNull)
}
def typedAssign(lhs: Tree, rhs: Tree): Tree = {
val lhs1 = typed(lhs, EXPRmode | LHSmode, WildcardType)
val varsym = lhs1.symbol
// see #2494 for double error message example
def fail() =
if (lhs1.isErrorTyped) lhs1
else AssignmentError(tree, varsym)
if (varsym == null)
return fail()
if (treeInfo.mayBeVarGetter(varsym)) {
treeInfo.methPart(lhs1) match {
case Select(qual, name) =>
val sel = Select(qual, nme.getterToSetter(name.toTermName)) setPos lhs.pos
val app = Apply(sel, List(rhs)) setPos tree.pos
return typed(app, mode, pt)
case _ =>
}
}
// if (varsym.isVariable ||
// // setter-rewrite has been done above, so rule out methods here, but, wait a minute, why are we assigning to non-variables after erasure?!
// (phase.erasedTypes && varsym.isValue && !varsym.isMethod)) {
if (varsym.isVariable || varsym.isValue && phase.erasedTypes) {
val rhs1 = typed(rhs, EXPRmode | BYVALmode, lhs1.tpe)
treeCopy.Assign(tree, lhs1, checkDead(rhs1)) setType UnitClass.tpe
}
else if(dyna.isDynamicallyUpdatable(lhs1)) {
val rhs1 = typed(rhs, EXPRmode | BYVALmode, WildcardType)
typed1(Apply(lhs1, List(rhs1)), mode, pt)
}
else fail()
}
def typedIf(cond: Tree, thenp: Tree, elsep: Tree) = {
val cond1 = checkDead(typed(cond, EXPRmode | BYVALmode, BooleanClass.tpe))
if (elsep.isEmpty) { // in the future, should be unnecessary
val thenp1 = typed(thenp, UnitClass.tpe)
treeCopy.If(tree, cond1, thenp1, elsep) setType thenp1.tpe
} else {
var thenp1 = typed(thenp, pt)
var elsep1 = typed(elsep, pt)
lazy val thenTp = packedType(thenp1, context.owner)
lazy val elseTp = packedType(elsep1, context.owner)
// println("typedIf: "+(thenp1.tpe, elsep1.tpe, ptOrLub(List(thenp1.tpe, elsep1.tpe)),"\n", thenTp, elseTp, thenTp =:= elseTp))
val (owntype, needAdapt) =
// in principle we should pack the types of each branch before lubbing, but lub doesn't really work for existentials anyway
// in the special (though common) case where the types are equal, it pays to pack before comparing
// especially virtpatmat needs more aggressive unification of skolemized types
// this breaks src/library/scala/collection/immutable/TrieIterator.scala
if ( opt.virtPatmat && !isPastTyper
&& thenp1.tpe.annotations.isEmpty && elsep1.tpe.annotations.isEmpty // annotated types need to be lubbed regardless (at least, continations break if you by pass them like this)
&& thenTp =:= elseTp
) (thenp1.tpe, false) // use unpacked type
// TODO: skolemize (lub of packed types) when that no longer crashes on files/pos/t4070b.scala
else ptOrLub(List(thenp1.tpe, elsep1.tpe), pt)
if (needAdapt) { //isNumericValueType(owntype)) {
thenp1 = adapt(thenp1, mode, owntype)
elsep1 = adapt(elsep1, mode, owntype)
}
treeCopy.If(tree, cond1, thenp1, elsep1) setType owntype
}
}
// under -Xexperimental (and not -Xoldpatmat), and when there's a suitable __match in scope, virtualize the pattern match
// otherwise, type the Match and leave it until phase `patmat` (immediately after typer)
// empty-selector matches are transformed into synthetic PartialFunction implementations when the expected type demands it
def typedVirtualizedMatch(tree: Tree, selector: Tree, cases: List[CaseDef]): Tree =
if (selector == EmptyTree) {
if (newPatternMatching && (pt.typeSymbol == PartialFunctionClass)) (new MatchFunTyper(tree, cases, mode, pt)).translated
else {
val arity = if (isFunctionType(pt)) pt.normalize.typeArgs.length - 1 else 1
val params = for (i <- List.range(0, arity)) yield
atPos(tree.pos.focusStart) {
ValDef(Modifiers(PARAM | SYNTHETIC),
unit.freshTermName("x" + i + "$"), TypeTree(), EmptyTree)
}
val ids = for (p <- params) yield Ident(p.name)
val selector1 = atPos(tree.pos.focusStart) { if (arity == 1) ids.head else gen.mkTuple(ids) }
val body = treeCopy.Match(tree, selector1, cases)
typed1(atPos(tree.pos) { Function(params, body) }, mode, pt)
}
} else
virtualizedMatch(typedMatch(selector, cases, mode, pt, tree), mode, pt)
def typedReturn(expr: Tree) = {
val enclMethod = context.enclMethod
if (enclMethod == NoContext ||
enclMethod.owner.isConstructor ||
context.enclClass.enclMethod == enclMethod // i.e., we are in a constructor of a local class
) {
ReturnOutsideOfDefError(tree)
} else {
val DefDef(_, name, _, _, restpt, _) = enclMethod.tree
if (restpt.tpe eq null) {
ReturnWithoutTypeError(tree, enclMethod.owner)
} else {
context.enclMethod.returnsSeen = true
val expr1: Tree = typed(expr, EXPRmode | BYVALmode, restpt.tpe)
// Warn about returning a value if no value can be returned.
if (restpt.tpe.typeSymbol == UnitClass) {
// The typing in expr1 says expr is Unit (it has already been coerced if
// it is non-Unit) so we have to retype it. Fortunately it won't come up much
// unless the warning is legitimate.
if (typed(expr).tpe.typeSymbol != UnitClass)
unit.warning(tree.pos, "enclosing method " + name + " has result type Unit: return value discarded")
}
treeCopy.Return(tree, checkDead(expr1)) setSymbol enclMethod.owner setType NothingClass.tpe
}
}
}
def typedNew(tpt: Tree) = {
val tpt1 = {
val tpt0 = typedTypeConstructor(tpt)
if (checkStablePrefixClassType(tpt0))
if (tpt0.hasSymbol && !tpt0.symbol.typeParams.isEmpty) {
context.undetparams = cloneSymbols(tpt0.symbol.typeParams)
notifyUndetparamsAdded(context.undetparams)
TypeTree().setOriginal(tpt0)
.setType(appliedType(tpt0.tpe, context.undetparams map (_.tpeHK))) // @PP: tpeHK! #3343, #4018, #4347.
} else tpt0
else tpt0
}
/** If current tree <tree> appears in <val x(: T)? = <tree>>
* return `tp with x.type' else return `tp`.
*/
def narrowRhs(tp: Type) = { val sym = context.tree.symbol
context.tree match {
case ValDef(mods, _, _, Apply(Select(`tree`, _), _)) if !mods.isMutable && sym != null && sym != NoSymbol =>
val sym1 = if (sym.owner.isClass && sym.getter(sym.owner) != NoSymbol) sym.getter(sym.owner)
else sym.lazyAccessorOrSelf
val pre = if (sym1.owner.isClass) sym1.owner.thisType else NoPrefix
intersectionType(List(tp, singleType(pre, sym1)))
case _ => tp
}}
val tp = tpt1.tpe
val sym = tp.typeSymbol.initialize
if (sym.isAbstractType || sym.hasAbstractFlag)
IsAbstractError(tree, sym)
else if (isPrimitiveValueClass(sym)) {
NotAMemberError(tpt, TypeTree(tp), nme.CONSTRUCTOR)
setError(tpt)
}
else if (!( tp == sym.thisSym.tpe // when there's no explicit self type -- with (#3612) or without self variable
// sym.thisSym.tpe == tp.typeOfThis (except for objects)
|| narrowRhs(tp) <:< tp.typeOfThis
|| phase.erasedTypes
)) {
DoesNotConformToSelfTypeError(tree, sym, tp.typeOfThis)
} else
treeCopy.New(tree, tpt1).setType(tp)
}
def typedEta(expr1: Tree): Tree = expr1.tpe match {
case TypeRef(_, ByNameParamClass, _) =>
val expr2 = Function(List(), expr1) setPos expr1.pos
new ChangeOwnerTraverser(context.owner, expr2.symbol).traverse(expr2)
typed1(expr2, mode, pt)
case NullaryMethodType(restpe) =>
val expr2 = Function(List(), expr1) setPos expr1.pos
new ChangeOwnerTraverser(context.owner, expr2.symbol).traverse(expr2)
typed1(expr2, mode, pt)
case PolyType(_, MethodType(formals, _)) =>
if (isFunctionType(pt)) expr1
else adapt(expr1, mode, functionType(formals map (t => WildcardType), WildcardType))
case MethodType(formals, _) =>
if (isFunctionType(pt)) expr1
else expr1 match {
case Select(qual, name) if (forMSIL &&
pt != WildcardType &&
pt != ErrorType &&
isSubType(pt, DelegateClass.tpe)) =>
val scalaCaller = newScalaCaller(pt)
addScalaCallerInfo(scalaCaller, expr1.symbol)
val n: Name = scalaCaller.name
val del = Ident(DelegateClass) setType DelegateClass.tpe
val f = Select(del, n)
//val f1 = TypeApply(f, List(Ident(pt.symbol) setType pt))
val args: List[Tree] = if(expr1.symbol.isStatic) List(Literal(Constant(null)))
else List(qual) // where the scala-method is located
val rhs = Apply(f, args)
typed(rhs)
case _ =>
adapt(expr1, mode, functionType(formals map (t => WildcardType), WildcardType))
}
case ErrorType =>
expr1
case _ =>
UnderscoreEtaError(expr1)
}
/**
* @param args ...
* @return ...
*/
def tryTypedArgs(args: List[Tree], mode: Int): Option[List[Tree]] = {
val c = context.makeSilent(false)
c.retyping = true
try {
val res = newTyper(c).typedArgs(args, mode)
if (c.hasErrors) None else Some(res)
} catch {
case ex: CyclicReference =>
throw ex
case te: TypeError =>
// @H some of typer erros can still leak,
// for instance in continuations
None
} finally {
c.flushBuffer()
}
}
/** Try to apply function to arguments; if it does not work, try to convert Java raw to existentials, or try to
* insert an implicit conversion.
*/
def tryTypedApply(fun: Tree, args: List[Tree]): Tree = {
val start = startTimer(failedApplyNanos)
def onError(typeError: AbsTypeError): Tree = {
stopTimer(failedApplyNanos, start)
// If the problem is with raw types, copnvert to existentials and try again.
// See #4712 for a case where this situation arises,
if ((fun.symbol ne null) && fun.symbol.isJavaDefined) {
val newtpe = rawToExistential(fun.tpe)
if (fun.tpe ne newtpe) {
// println("late cooking: "+fun+":"+fun.tpe) // DEBUG
return tryTypedApply(fun setType newtpe, args)
}
}
def treesInResult(tree: Tree): List[Tree] = tree :: (tree match {
case Block(_, r) => treesInResult(r)
case Match(_, cases) => cases
case CaseDef(_, _, r) => treesInResult(r)
case Annotated(_, r) => treesInResult(r)
case If(_, t, e) => treesInResult(t) ++ treesInResult(e)
case Try(b, catches, _) => treesInResult(b) ++ catches
case Typed(r, Function(Nil, EmptyTree)) => treesInResult(r)
case _ => Nil
})
def errorInResult(tree: Tree) = treesInResult(tree) exists (_.pos == typeError.errPos)
val retry = (typeError.errPos != null) && (fun :: tree :: args exists errorInResult)
printTyping {
val funStr = ptTree(fun) + " and " + (args map ptTree mkString ", ")
if (retry) "second try: " + funStr
else "no second try: " + funStr + " because error not in result: " + typeError.errPos+"!="+tree.pos
}
if (retry) {
val Select(qual, name) = fun
tryTypedArgs(args, forArgMode(fun, mode)) match {
case Some(args1) =>
val qual1 =
if (!pt.isError) adaptToArguments(qual, name, args1, pt, true, true)
else qual
if (qual1 ne qual) {
val tree1 = Apply(Select(qual1, name) setPos fun.pos, args1) setPos tree.pos
return typed1(tree1, mode | SNDTRYmode, pt)
}
case _ => ()
}
}
issue(typeError)
setError(treeCopy.Apply(tree, fun, args))
}
silent(_.doTypedApply(tree, fun, args, mode, pt)) match {
case SilentResultValue(t) =>
t
case SilentTypeError(err) =>
onError(err)
}
}
def typedApply(fun: Tree, args: List[Tree]) = {
val stableApplication = (fun.symbol ne null) && fun.symbol.isMethod && fun.symbol.isStable
if (stableApplication && isPatternMode) {
// treat stable function applications f() as expressions.
typed1(tree, mode & ~PATTERNmode | EXPRmode, pt)
} else {
val funpt = if (isPatternMode) pt else WildcardType
val appStart = startTimer(failedApplyNanos)
val opeqStart = startTimer(failedOpEqNanos)
def onError(reportError: => Tree): Tree = {
fun match {
case Select(qual, name)
if !isPatternMode && nme.isOpAssignmentName(newTermName(name.decode)) =>
val qual1 = typedQualifier(qual)
if (treeInfo.isVariableOrGetter(qual1)) {
stopTimer(failedOpEqNanos, opeqStart)
convertToAssignment(fun, qual1, name, args)
} else {
stopTimer(failedApplyNanos, appStart)
reportError
}
case _ =>
stopTimer(failedApplyNanos, appStart)
reportError
}
}
silent(_.typed(fun, forFunMode(mode), funpt),
if ((mode & EXPRmode) != 0) false else context.ambiguousErrors,
if ((mode & EXPRmode) != 0) tree else context.tree) match {
case SilentResultValue(fun1) =>
val fun2 = if (stableApplication) stabilizeFun(fun1, mode, pt) else fun1
incCounter(typedApplyCount)
def isImplicitMethod(tpe: Type) = tpe match {
case mt: MethodType => mt.isImplicit
case _ => false
}
val useTry = (
!isPastTyper
&& fun2.isInstanceOf[Select]
&& !isImplicitMethod(fun2.tpe)
&& ((fun2.symbol eq null) || !fun2.symbol.isConstructor)
&& (mode & (EXPRmode | SNDTRYmode)) == EXPRmode
)
val res =
if (useTry) tryTypedApply(fun2, args)
else doTypedApply(tree, fun2, args, mode, pt)
/*
if (fun2.hasSymbol && fun2.symbol.isConstructor && (mode & EXPRmode) != 0) {
res.tpe = res.tpe.notNull
}
*/
// TODO: In theory we should be able to call:
//if (fun2.hasSymbol && fun2.symbol.name == nme.apply && fun2.symbol.owner == ArrayClass) {
// But this causes cyclic reference for Array class in Cleanup. It is easy to overcome this
// by calling ArrayClass.info here (or some other place before specialize).
if (fun2.symbol == Array_apply && !res.isErrorTyped) {
val checked = gen.mkCheckInit(res)
// this check is needed to avoid infinite recursion in Duplicators
// (calling typed1 more than once for the same tree)
if (checked ne res) typed { atPos(tree.pos)(checked) }
else res
} else
res
case SilentTypeError(err) =>
onError({issue(err); setError(tree)})
}
}
}
def convertToAssignment(fun: Tree, qual: Tree, name: Name, args: List[Tree]): Tree = {
val prefix = name stripSuffix nme.EQL
def mkAssign(vble: Tree): Tree =
Assign(
vble,
Apply(
Select(vble.duplicate, prefix) setPos fun.pos.focus, args) setPos tree.pos.makeTransparent
) setPos tree.pos
def mkUpdate(table: Tree, indices: List[Tree]) = {
gen.evalOnceAll(table :: indices, context.owner, context.unit) {
case tab :: is =>
def mkCall(name: Name, extraArgs: Tree*) = (
Apply(
Select(tab(), name) setPos table.pos,
is.map(i => i()) ++ extraArgs
) setPos tree.pos
)
mkCall(
nme.update,
Apply(Select(mkCall(nme.apply), prefix) setPos fun.pos, args) setPos tree.pos
)
case _ => EmptyTree
}
}
val tree1 = qual match {
case Ident(_) =>
mkAssign(qual)
case Select(qualqual, vname) =>
gen.evalOnce(qualqual, context.owner, context.unit) { qq =>
val qq1 = qq()
mkAssign(Select(qq1, vname) setPos qual.pos)
}
case Apply(fn, indices) =>
treeInfo.methPart(fn) match {
case Select(table, nme.apply) => mkUpdate(table, indices)
case _ => UnexpectedTreeAssignmentConversionError(qual)
}
}
typed1(tree1, mode, pt)
}
def typedSuper(qual: Tree, mix: TypeName) = {
val qual1 = typed(qual)
val clazz = qual1 match {
case This(_) => qual1.symbol
case _ => qual1.tpe.typeSymbol
}
//println(clazz+"/"+qual1.tpe.typeSymbol+"/"+qual1)
def findMixinSuper(site: Type): Type = {
var ps = site.parents filter (_.typeSymbol.name == mix)
if (ps.isEmpty)
ps = site.parents filter (_.typeSymbol.toInterface.name == mix)
if (ps.isEmpty) {
debuglog("Fatal: couldn't find site " + site + " in " + site.parents.map(_.typeSymbol.name))
if (phase.erasedTypes && context.enclClass.owner.isImplClass) {
// println(qual1)
// println(clazz)
// println(site)
// println(site.parents)
// println(mix)
// the reference to super class got lost during erasure
restrictionError(tree.pos, unit, "traits may not select fields or methods from super[C] where C is a class")
ErrorType
} else {
MixinMissingParentClassNameError(tree, mix, clazz)
ErrorType
}
} else if (!ps.tail.isEmpty) {
AmbiguousParentClassError(tree)
ErrorType
} else {
ps.head
}
}
val owntype = (
if (!mix.isEmpty) findMixinSuper(clazz.tpe)
else if ((mode & SUPERCONSTRmode) != 0) clazz.info.firstParent
else intersectionType(clazz.info.parents)
)
treeCopy.Super(tree, qual1, mix) setType SuperType(clazz.thisType, owntype)
}
def typedThis(qual: Name) = tree.symbol orElse qualifyingClass(tree, qual, packageOK = false) match {
case NoSymbol => tree
case clazz =>
tree setSymbol clazz setType clazz.thisType.underlying
if (isStableContext(tree, mode, pt)) tree setType clazz.thisType else tree
}
/** Attribute a selection where <code>tree</code> is <code>qual.name</code>.
* <code>qual</code> is already attributed.
*
* @param qual ...
* @param name ...
* @return ...
*/
def typedSelect(qual: Tree, name: Name): Tree = {
def asDynamicCall = dyna.mkInvoke(context.tree, tree, qual, name) map (typed1(_, mode, pt))
val sym = tree.symbol orElse member(qual, name) orElse {
// symbol not found? --> try to convert implicitly to a type that does have the required
// member. Added `| PATTERNmode` to allow enrichment in patterns (so we can add e.g., an
// xml member to StringContext, which in turn has an unapply[Seq] method)
if (name != nme.CONSTRUCTOR && inExprModeOr(mode, PATTERNmode)) {
val qual1 = adaptToMemberWithArgs(tree, qual, name, mode, true, true)
if (qual1 ne qual)
return typed(treeCopy.Select(tree, qual1, name), mode, pt)
}
NoSymbol
}
if (phase.erasedTypes && qual.isInstanceOf[Super] && tree.symbol != NoSymbol)
qual.tpe = tree.symbol.owner.tpe
if (!reallyExists(sym)) {
if (context.owner.enclosingTopLevelClass.isJavaDefined && name.isTypeName) {
val tree1 = atPos(tree.pos) { gen.convertToSelectFromType(qual, name) }
if (tree1 != EmptyTree) return typed1(tree1, mode, pt)
}
// try to expand according to Dynamic rules.
asDynamicCall foreach (x => return x)
debuglog(
"qual = "+qual+":"+qual.tpe+
"\nSymbol="+qual.tpe.termSymbol+"\nsymbol-info = "+qual.tpe.termSymbol.info+
"\nscope-id = "+qual.tpe.termSymbol.info.decls.hashCode()+"\nmembers = "+qual.tpe.members+
"\nname = "+name+"\nfound = "+sym+"\nowner = "+context.enclClass.owner
)
def makeInteractiveErrorTree = {
val tree1 = tree match {
case Select(_, _) => treeCopy.Select(tree, qual, name)
case SelectFromTypeTree(_, _) => treeCopy.SelectFromTypeTree(tree, qual, name)
}
setError(tree1)
}
if (name == nme.ERROR && forInteractive)
return makeInteractiveErrorTree
if (!qual.tpe.widen.isErroneous) {
if ((mode & QUALmode) != 0) {
val lastTry = missingHook(qual.tpe.typeSymbol, name)
if (lastTry != NoSymbol) return typed1(tree setSymbol lastTry, mode, pt)
}
NotAMemberError(tree, qual, name)
}
if (forInteractive) makeInteractiveErrorTree else setError(tree)
} else {
val tree1 = tree match {
case Select(_, _) => treeCopy.Select(tree, qual, name)
case SelectFromTypeTree(_, _) => treeCopy.SelectFromTypeTree(tree, qual, name)
}
val (result, accessibleError) = silent(_.makeAccessible(tree1, sym, qual.tpe, qual)) match {
case SilentTypeError(err) =>
if (err.kind != ErrorKinds.Access) {
context issue err
return setError(tree)
}
else (tree1, Some(err))
case SilentResultValue(treeAndPre) =>
(stabilize(treeAndPre._1, treeAndPre._2, mode, pt), None)
}
def isPotentialNullDeference() = {
!isPastTyper &&
!sym.isConstructor &&
!(qual.tpe <:< NotNullClass.tpe) && !qual.tpe.isNotNull &&
!(List(Any_isInstanceOf, Any_asInstanceOf) contains result.symbol) // null.is/as is not a dereference
}
// unit is null here sometimes; how are we to know when unit might be null? (See bug #2467.)
if (settings.warnSelectNullable.value && isPotentialNullDeference && unit != null)
unit.warning(tree.pos, "potential null pointer dereference: "+tree)
result match {
// could checkAccessible (called by makeAccessible) potentially have skipped checking a type application in qual?
case SelectFromTypeTree(qual@TypeTree(), name) if qual.tpe.typeArgs.nonEmpty => // TODO: somehow the new qual is not checked in refchecks
treeCopy.SelectFromTypeTree(
result,
(TypeTreeWithDeferredRefCheck(){ () => val tp = qual.tpe; val sym = tp.typeSymbolDirect
// will execute during refchecks -- TODO: make private checkTypeRef in refchecks public and call that one?
checkBounds(qual, tp.prefix, sym.owner, sym.typeParams, tp.typeArgs, "")
qual // you only get to see the wrapped tree after running this check :-p
}) setType qual.tpe setPos qual.pos,
name)
case _ if accessibleError.isDefined =>
val qual1 = adaptToMemberWithArgs(tree, qual, name, mode, false, false)
if (!qual1.isErrorTyped && (qual1 ne qual))
typed(Select(qual1, name) setPos tree.pos, mode, pt)
else
// before failing due to access, try a dynamic call.
asDynamicCall getOrElse {
issue(accessibleError.get)
setError(tree)
}
case _ =>
result
}
}
}
/** Attribute an identifier consisting of a simple name or an outer reference.
*
* @param tree The tree representing the identifier.
* @param name The name of the identifier.
* Transformations: (1) Prefix class members with this.
* (2) Change imported symbols to selections
*/
def typedIdent(name: Name): Tree = {
var errorContainer: AbsTypeError = null
@inline
def ambiguousError(msg: String) = {
assert(errorContainer == null, "Cannot set ambiguous error twice for identifier")
errorContainer = AmbiguousIdentError(tree, name, msg)
}
@inline
def identError(tree: AbsTypeError) = {
assert(errorContainer == null, "Cannot set ambiguous error twice for identifier")
errorContainer = tree
}
var defSym: Symbol = tree.symbol // the directly found symbol
var pre: Type = NoPrefix // the prefix type of defSym, if a class member
var qual: Tree = EmptyTree // the qualifier tree if transformed tree is a select
var inaccessibleSym: Symbol = NoSymbol // the first symbol that was found but that was discarded
// for being inaccessible; used for error reporting
var inaccessibleExplanation: String = ""
// If a special setting is given, the empty package will be checked as a
// last ditch effort before failing. This method sets defSym and returns
// true if a member of the given name exists.
def checkEmptyPackage(): Boolean = {
defSym = rootMirror.EmptyPackageClass.tpe.nonPrivateMember(name)
defSym != NoSymbol
}
def startingIdentContext = (
// ignore current variable scope in patterns to enforce linearity
if ((mode & (PATTERNmode | TYPEPATmode)) == 0) context
else context.outer
)
// A symbol qualifies if it exists and is not stale. Stale symbols
// are made to disappear here. In addition,
// if we are in a constructor of a pattern, we ignore all definitions
// which are methods (note: if we don't do that
// case x :: xs in class List would return the :: method)
// unless they are stable or are accessors (the latter exception is for better error messages).
def qualifies(sym: Symbol): Boolean = {
sym.hasRawInfo && // this condition avoids crashing on self-referential pattern variables
reallyExists(sym) &&
((mode & PATTERNmode | FUNmode) != (PATTERNmode | FUNmode) || !sym.isSourceMethod || sym.hasFlag(ACCESSOR))
}
if (defSym == NoSymbol) {
var defEntry: ScopeEntry = null // the scope entry of defSym, if defined in a local scope
var cx = startingIdentContext
while (defSym == NoSymbol && cx != NoContext && (cx.scope ne null)) { // cx.scope eq null arises during FixInvalidSyms in Duplicators
pre = cx.enclClass.prefix
defEntry = cx.scope.lookupEntry(name)
if ((defEntry ne null) && qualifies(defEntry.sym)) {
// Right here is where SI-1987, overloading in package objects, can be
// seen to go wrong. There is an overloaded symbol, but when referring
// to the unqualified identifier from elsewhere in the package, only
// the last definition is visible. So overloading mis-resolves and is
// definition-order dependent, bad things. See run/t1987.scala.
//
// I assume the actual problem involves how/where these symbols are entered
// into the scope. But since I didn't figure out how to fix it that way, I
// catch it here by looking up package-object-defined symbols in the prefix.
if (isInPackageObject(defEntry.sym, pre.typeSymbol)) {
defSym = pre.member(defEntry.sym.name)
if (defSym ne defEntry.sym) {
log("!!! Overloaded package object member resolved incorrectly.\n Discarded: " +
defEntry.sym.defString + "\n Using: " + defSym.defString)
}
}
else
defSym = defEntry.sym
}
else {
cx = cx.enclClass
val foundSym = pre.member(name) filter qualifies
defSym = foundSym filter (context.isAccessible(_, pre, false))
if (defSym == NoSymbol) {
if ((foundSym ne NoSymbol) && (inaccessibleSym eq NoSymbol)) {
inaccessibleSym = foundSym
inaccessibleExplanation = analyzer.lastAccessCheckDetails
}
cx = cx.outer
}
}
}
val symDepth = if (defEntry eq null) cx.depth
else cx.depth - (cx.scope.nestingLevel - defEntry.owner.nestingLevel)
var impSym: Symbol = NoSymbol // the imported symbol
var imports = context.imports // impSym != NoSymbol => it is imported from imports.head
while (!reallyExists(impSym) && !imports.isEmpty && imports.head.depth > symDepth) {
impSym = imports.head.importedSymbol(name)
if (!impSym.exists) imports = imports.tail
}
// detect ambiguous definition/import,
// update `defSym` to be the final resolved symbol,
// update `pre` to be `sym`s prefix type in case it is an imported member,
// and compute value of:
if (defSym.exists && impSym.exists) {
// imported symbols take precedence over package-owned symbols in different
// compilation units. Defined symbols take precedence over erroneous imports.
if (defSym.isDefinedInPackage &&
(!currentRun.compiles(defSym) ||
context.unit.exists && defSym.sourceFile != context.unit.source.file))
defSym = NoSymbol
else if (impSym.isError || impSym.name == nme.CONSTRUCTOR)
impSym = NoSymbol
}
if (defSym.exists) {
if (impSym.exists)
ambiguousError(
"it is both defined in "+defSym.owner +
" and imported subsequently by \n"+imports.head)
else if (!defSym.owner.isClass || defSym.owner.isPackageClass || defSym.isTypeParameterOrSkolem)
pre = NoPrefix
else
qual = atPos(tree.pos.focusStart)(gen.mkAttributedQualifier(pre))
} else {
if (impSym.exists) {
var impSym1 = NoSymbol
var imports1 = imports.tail
def ambiguousImport() = {
if (!(imports.head.qual.tpe =:= imports1.head.qual.tpe))
ambiguousError(
"it is imported twice in the same scope by\n"+imports.head + "\nand "+imports1.head)
}
while (errorContainer == null && !imports1.isEmpty &&
(!imports.head.isExplicitImport(name) ||
imports1.head.depth == imports.head.depth)) {
var impSym1 = imports1.head.importedSymbol(name)
if (reallyExists(impSym1)) {
if (imports1.head.isExplicitImport(name)) {
if (imports.head.isExplicitImport(name) ||
imports1.head.depth != imports.head.depth) ambiguousImport()
impSym = impSym1
imports = imports1
} else if (!imports.head.isExplicitImport(name) &&
imports1.head.depth == imports.head.depth) ambiguousImport()
}
imports1 = imports1.tail
}
defSym = impSym
val qual0 = imports.head.qual
if (!(shortenImports && qual0.symbol.isPackage)) // optimization: don't write out package prefixes
qual = atPos(tree.pos.focusStart)(resetPos(qual0.duplicate))
pre = qual.tpe
}
else if (settings.exposeEmptyPackage.value && checkEmptyPackage())
log("Allowing empty package member " + name + " due to settings.")
else {
if ((mode & QUALmode) != 0) {
val lastTry = missingHook(rootMirror.RootClass, name)
if (lastTry != NoSymbol) return typed1(tree setSymbol lastTry, mode, pt)
}
if (settings.debug.value) {
log(context.imports)//debug
}
if (inaccessibleSym eq NoSymbol) {
// Avoiding some spurious error messages: see SI-2388.
if (reporter.hasErrors && (name startsWith tpnme.ANON_CLASS_NAME)) ()
else identError(SymbolNotFoundError(tree, name, context.owner, startingIdentContext))
} else
identError(InferErrorGen.AccessError(
tree, inaccessibleSym, context.enclClass.owner.thisType, context.enclClass.owner,
inaccessibleExplanation
))
defSym = context.owner.newErrorSymbol(name)
}
}
}
if (errorContainer != null) {
ErrorUtils.issueTypeError(errorContainer)
setError(tree)
} else {
if (defSym.owner.isPackageClass)
pre = defSym.owner.thisType
// Inferring classOf type parameter from expected type.
if (defSym.isThisSym) {
typed1(This(defSym.owner) setPos tree.pos, mode, pt)
}
// Inferring classOf type parameter from expected type. Otherwise an
// actual call to the stubbed classOf method is generated, returning null.
else if (isPredefMemberNamed(defSym, nme.classOf) && pt.typeSymbol == ClassClass && pt.typeArgs.nonEmpty)
typedClassOf(tree, TypeTree(pt.typeArgs.head))
else {
val tree1 = (
if (qual == EmptyTree) tree
// atPos necessary because qualifier might come from startContext
else atPos(tree.pos)(Select(qual, name))
)
val (tree2, pre2) = makeAccessible(tree1, defSym, pre, qual)
// assert(pre.typeArgs isEmpty) // no need to add #2416-style check here, right?
stabilize(tree2, pre2, mode, pt)
}
}
}
def typedCompoundTypeTree(templ: Template) = {
val parents1 = templ.parents mapConserve (typedType(_, mode))
if (parents1 exists (_.isErrorTyped)) tree setType ErrorType
else {
val decls = newScope
//Console.println("Owner: " + context.enclClass.owner + " " + context.enclClass.owner.id)
val self = refinedType(parents1 map (_.tpe), context.enclClass.owner, decls, templ.pos)
newTyper(context.make(templ, self.typeSymbol, decls)).typedRefinement(templ.body)
tree setType self
}
}
def typedAppliedTypeTree(tpt: Tree, args: List[Tree]) = {
val tpt1 = typed1(tpt, mode | FUNmode | TAPPmode, WildcardType)
if (tpt1.isErrorTyped) {
tpt1
} else if (!tpt1.hasSymbol) {
AppliedTypeNoParametersError(tree, tpt1.tpe)
} else {
val tparams = tpt1.symbol.typeParams
if (sameLength(tparams, args)) {
// @M: kind-arity checking is done here and in adapt, full kind-checking is in checkKindBounds (in Infer)
val args1 =
if (!tpt1.symbol.rawInfo.isComplete)
args mapConserve (typedHigherKindedType(_, mode))
// if symbol hasn't been fully loaded, can't check kind-arity
else map2Conserve(args, tparams) { (arg, tparam) =>
//@M! the polytype denotes the expected kind
typedHigherKindedType(arg, mode, GenPolyType(tparam.typeParams, AnyClass.tpe))
}
val argtypes = args1 map (_.tpe)
foreach2(args, tparams)((arg, tparam) => arg match {
// note: can't use args1 in selector, because Bind's got replaced
case Bind(_, _) =>
if (arg.symbol.isAbstractType)
arg.symbol setInfo // XXX, feedback. don't trackSymInfo here!
TypeBounds(
lub(List(arg.symbol.info.bounds.lo, tparam.info.bounds.lo.subst(tparams, argtypes))),
glb(List(arg.symbol.info.bounds.hi, tparam.info.bounds.hi.subst(tparams, argtypes))))
case _ =>
})
val original = treeCopy.AppliedTypeTree(tree, tpt1, args1)
val result = TypeTree(appliedType(tpt1.tpe, argtypes)) setOriginal original
if(tpt1.tpe.isInstanceOf[PolyType]) // did the type application (performed by appliedType) involve an unchecked beta-reduction?
TypeTreeWithDeferredRefCheck(){ () =>
// wrap the tree and include the bounds check -- refchecks will perform this check (that the beta reduction was indeed allowed) and unwrap
// we can't simply use original in refchecks because it does not contains types
// (and the only typed trees we have have been mangled so they're not quite the original tree anymore)
checkBounds(result, tpt1.tpe.prefix, tpt1.symbol.owner, tpt1.symbol.typeParams, argtypes, "")
result // you only get to see the wrapped tree after running this check :-p
} setType (result.tpe) setPos(result.pos)
else result
} else if (tparams.isEmpty) {
AppliedTypeNoParametersError(tree, tpt1.tpe)
} else {
//Console.println("\{tpt1}:\{tpt1.symbol}:\{tpt1.symbol.info}")
if (settings.debug.value) Console.println(tpt1+":"+tpt1.symbol+":"+tpt1.symbol.info)//debug
AppliedTypeWrongNumberOfArgsError(tree, tpt1, tparams)
}
}
}
// begin typed1
val sym: Symbol = tree.symbol
if ((sym ne null) && (sym ne NoSymbol)) sym.initialize
//if (settings.debug.value && tree.isDef) log("typing definition of "+sym);//DEBUG
tree match {
case PackageDef(pid, stats) =>
val pid1 = typedQualifier(pid).asInstanceOf[RefTree]
assert(sym.moduleClass ne NoSymbol, sym)
// complete lazy annotations
val annots = sym.annotations
val stats1 = newTyper(context.make(tree, sym.moduleClass, sym.info.decls))
.typedStats(stats, NoSymbol)
treeCopy.PackageDef(tree, pid1, stats1) setType NoType
case tree @ ClassDef(_, _, _, _) =>
newTyper(context.makeNewScope(tree, sym)).typedClassDef(tree)
case tree @ ModuleDef(_, _, _) =>
newTyper(context.makeNewScope(tree, sym.moduleClass)).typedModuleDef(tree)
case vdef @ ValDef(_, _, _, _) =>
typedValDef(vdef)
case ddef @ DefDef(_, _, _, _, _, _) =>
// flag default getters for constructors. An actual flag would be nice. See SI-5543.
//val flag = ddef.mods.hasDefaultFlag && ddef.mods.hasFlag(PRESUPER)
val flag = ddef.mods.hasDefaultFlag && sym.owner.isModuleClass &&
nme.defaultGetterToMethod(sym.name) == nme.CONSTRUCTOR
newTyper(context.makeNewScope(tree, sym)).constrTyperIf(flag).typedDefDef(ddef)
case tdef @ TypeDef(_, _, _, _) =>
typedTypeDef(tdef)
case ldef @ LabelDef(_, _, _) =>
labelTyper(ldef).typedLabelDef(ldef)
case ddef @ DocDef(comment, defn) =>
if (forScaladoc && (sym ne null) && (sym ne NoSymbol)) {
docComments(sym) = comment
comment.defineVariables(sym)
val typer1 = newTyper(context.makeNewScope(tree, context.owner))
for (useCase <- comment.useCases) {
typer1.silent(_.typedUseCase(useCase)) match {
case SilentTypeError(err) =>
unit.warning(useCase.pos, err.errMsg)
case _ =>
}
for (useCaseSym <- useCase.defined) {
if (sym.name != useCaseSym.name)
unit.warning(useCase.pos, "@usecase " + useCaseSym.name.decode + " does not match commented symbol: " + sym.name.decode)
}
}
}
typed(defn, mode, pt)
case Annotated(constr, arg) =>
typedAnnotated(constr, typed(arg, mode, pt))
case tree @ Block(_, _) =>
typerWithLocalContext(context.makeNewScope(tree, context.owner)){
_.typedBlock(tree, mode, pt)
}
case Alternative(alts) =>
val alts1 = alts mapConserve (alt => typed(alt, mode | ALTmode, pt))
treeCopy.Alternative(tree, alts1) setType pt
case Star(elem) =>
if ((mode & STARmode) == 0 && !isPastTyper)
StarPatternWithVarargParametersError(tree)
treeCopy.Star(tree, typed(elem, mode, pt)) setType makeFullyDefined(pt)
case Bind(name, body) =>
typedBind(name, body)
case UnApply(fun, args) =>
val fun1 = typed(fun)
val tpes = formalTypes(unapplyTypeList(fun.symbol, fun1.tpe), args.length)
val args1 = map2(args, tpes)(typedPattern)
treeCopy.UnApply(tree, fun1, args1) setType pt
case ArrayValue(elemtpt, elems) =>
typedArrayValue(elemtpt, elems)
case tree @ Function(_, _) =>
if (tree.symbol == NoSymbol)
tree.symbol = context.owner.newAnonymousFunctionValue(tree.pos)
typerWithLocalContext(context.makeNewScope(tree, tree.symbol))(_.typedFunction(tree, mode, pt))
case Assign(lhs, rhs) =>
typedAssign(lhs, rhs)
case AssignOrNamedArg(lhs, rhs) => // called by NamesDefaults in silent typecheck
typedAssign(lhs, rhs)
case If(cond, thenp, elsep) =>
typedIf(cond, thenp, elsep)
case tree @ Match(selector, cases) =>
typedVirtualizedMatch(tree, selector, cases)
case Return(expr) =>
typedReturn(expr)
case Try(block, catches, finalizer) =>
var block1 = typed(block, pt)
var catches1 = typedCases(catches, ThrowableClass.tpe, pt)
val finalizer1 = if (finalizer.isEmpty) finalizer
else typed(finalizer, UnitClass.tpe)
val (owntype, needAdapt) = ptOrLub(block1.tpe :: (catches1 map (_.tpe)), pt)
if (needAdapt) {
block1 = adapt(block1, mode, owntype)
catches1 = catches1 map (adaptCase(_, mode, owntype))
}
treeCopy.Try(tree, block1, catches1, finalizer1) setType owntype
case Throw(expr) =>
val expr1 = typed(expr, EXPRmode | BYVALmode, ThrowableClass.tpe)
treeCopy.Throw(tree, expr1) setType NothingClass.tpe
case New(tpt: Tree) =>
typedNew(tpt)
case Typed(expr, Function(List(), EmptyTree)) =>
// find out whether the programmer is trying to eta-expand a macro def
// to do that we need to typecheck the tree first (we need a symbol of the eta-expandee)
// that typecheck must not trigger macro expansions, so we explicitly prohibit them
// Q: "but, " - you may ask - ", `typed1` doesn't call adapt, which does macro expansion, so why explicit check?"
// A: solely for robustness reasons. this mechanism might change in the future, which might break unprotected code
val expr1 = context.withMacrosDisabled(typed1(expr, mode, pt))
expr1 match {
case macroDef if macroDef.symbol != null && macroDef.symbol.isTermMacro && !macroDef.symbol.isErroneous =>
MacroEtaError(expr1)
case _ =>
typedEta(checkDead(expr1))
}
case Typed(expr0, tpt @ Ident(tpnme.WILDCARD_STAR)) =>
val expr = typed(expr0, onlyStickyModes(mode), WildcardType)
def subArrayType(pt: Type) =
if (isPrimitiveValueClass(pt.typeSymbol) || !isFullyDefined(pt)) arrayType(pt)
else {
val tparam = context.owner freshExistential "" setInfo TypeBounds.upper(pt)
newExistentialType(List(tparam), arrayType(tparam.tpe))
}
val (expr1, baseClass) = expr.tpe.typeSymbol match {
case ArrayClass => (adapt(expr, onlyStickyModes(mode), subArrayType(pt)), ArrayClass)
case _ => (adapt(expr, onlyStickyModes(mode), seqType(pt)), SeqClass)
}
expr1.tpe.baseType(baseClass) match {
case TypeRef(_, _, List(elemtp)) =>
treeCopy.Typed(tree, expr1, tpt setType elemtp) setType elemtp
case _ =>
setError(tree)
}
case Typed(expr, tpt) =>
val tpt1 = typedType(tpt, mode)
val expr1 = typed(expr, onlyStickyModes(mode), tpt1.tpe.deconst)
val ownType = if (isPatternMode) inferTypedPattern(tpt1, tpt1.tpe, pt) else tpt1.tpe
treeCopy.Typed(tree, expr1, tpt1) setType ownType
case TypeApply(fun, args) =>
// @M: kind-arity checking is done here and in adapt, full kind-checking is in checkKindBounds (in Infer)
//@M! we must type fun in order to type the args, as that requires the kinds of fun's type parameters.
// However, args should apparently be done first, to save context.undetparams. Unfortunately, the args
// *really* have to be typed *after* fun. We escape from this classic Catch-22 by simply saving&restoring undetparams.
// @M TODO: the compiler still bootstraps&all tests pass when this is commented out..
//val undets = context.undetparams
// @M: fun is typed in TAPPmode because it is being applied to its actual type parameters
val fun1 = typed(fun, forFunMode(mode) | TAPPmode, WildcardType)
val tparams = fun1.symbol.typeParams
//@M TODO: val undets_fun = context.undetparams ?
// "do args first" (by restoring the context.undetparams) in order to maintain context.undetparams on the function side.
// @M TODO: the compiler still bootstraps when this is commented out.. TODO: run tests
//context.undetparams = undets
// @M maybe the well-kindedness check should be done when checking the type arguments conform to the type parameters' bounds?
val args1 = if (sameLength(args, tparams)) map2Conserve(args, tparams) {
//@M! the polytype denotes the expected kind
(arg, tparam) => typedHigherKindedType(arg, mode, GenPolyType(tparam.typeParams, AnyClass.tpe))
} else {
//@M this branch is correctly hit for an overloaded polymorphic type. It also has to handle erroneous cases.
// Until the right alternative for an overloaded method is known, be very liberal,
// typedTypeApply will find the right alternative and then do the same check as
// in the then-branch above. (see pos/tcpoly_overloaded.scala)
// this assert is too strict: be tolerant for errors like trait A { def foo[m[x], g]=error(""); def x[g] = foo[g/*ERR: missing argument type*/] }
//assert(fun1.symbol.info.isInstanceOf[OverloadedType] || fun1.symbol.isError) //, (fun1.symbol,fun1.symbol.info,fun1.symbol.info.getClass,args,tparams))
args mapConserve (typedHigherKindedType(_, mode))
}
//@M TODO: context.undetparams = undets_fun ?
typedTypeApply(tree, mode, fun1, args1)
case Apply(Block(stats, expr), args) =>
typed1(atPos(tree.pos)(Block(stats, Apply(expr, args))), mode, pt)
case Apply(fun, args) =>
typedApply(fun, args) match {
case Apply(Select(New(tpt), name), args)
if (tpt.tpe != null &&
tpt.tpe.typeSymbol == ArrayClass &&
args.length == 1 &&
erasure.GenericArray.unapply(tpt.tpe).isDefined) => // !!! todo simplify by using extractor
// convert new Array[T](len) to evidence[ClassTag[T]].newArray(len)
// convert new Array^N[T](len) for N > 1 to evidence[ClassTag[Array[...Array[T]...]]].newArray(len), where Array HK gets applied (N-1) times
// [Eugene] no more MaxArrayDims. ClassTags are flexible enough to allow creation of arrays of arbitrary dimensionality (w.r.t JVM restrictions)
val Some((level, componentType)) = erasure.GenericArray.unapply(tpt.tpe)
val tagType = List.iterate(componentType, level)(tpe => appliedType(ArrayClass.asType, List(tpe))).last
val newArrayApp = atPos(tree.pos) {
val tag = resolveArrayTag(tagType, tree.pos)
if (tag.isEmpty) MissingArrayTagError(tree, tagType)
else new ApplyToImplicitArgs(Select(tag, nme.newArray), args)
}
typed(newArrayApp, mode, pt)
case tree1 =>
tree1
}
case ApplyDynamic(qual, args) =>
val reflectiveCalls = !(settings.refinementMethodDispatch.value == "invoke-dynamic")
val qual1 = typed(qual, AnyRefClass.tpe)
val args1 = args mapConserve (arg => if (reflectiveCalls) typed(arg, AnyRefClass.tpe) else typed(arg))
treeCopy.ApplyDynamic(tree, qual1, args1) setType (if (reflectiveCalls) AnyRefClass.tpe else tree.symbol.info.resultType)
case Super(qual, mix) =>
typedSuper(qual, mix)
case This(qual) =>
typedThis(qual)
case Select(qual @ Super(_, _), nme.CONSTRUCTOR) =>
val qual1 =
typed(qual, EXPRmode | QUALmode | POLYmode | SUPERCONSTRmode, WildcardType)
// the qualifier type of a supercall constructor is its first parent class
typedSelect(qual1, nme.CONSTRUCTOR)
case Select(qual, name) =>
incCounter(typedSelectCount)
var qual1 = checkDead(typedQualifier(qual, mode))
if (name.isTypeName) qual1 = checkStable(qual1)
val tree1 = // temporarily use `filter` and an alternative for `withFilter`
if (name == nme.withFilter)
silent(_ => typedSelect(qual1, name)) match {
case SilentResultValue(result) =>
result
case _ =>
silent(_ => typed1(Select(qual1, nme.filter) setPos tree.pos, mode, pt)) match {
case SilentResultValue(result2) =>
unit.deprecationWarning(
tree.pos, "`withFilter' method does not yet exist on "+qual1.tpe.widen+
", using `filter' method instead")
result2
case SilentTypeError(err) =>
WithFilterError(tree, err)
}
}
else
typedSelect(qual1, name)
if (tree.isInstanceOf[PostfixSelect])
checkFeature(tree.pos, PostfixOpsFeature, name.decode)
if (tree1.symbol != null && tree1.symbol.isOnlyRefinementMember)
checkFeature(tree1.pos, ReflectiveCallsFeature, tree1.symbol.toString)
if (qual1.hasSymbolWhich(_.isRootPackage)) treeCopy.Ident(tree1, name)
else tree1
case Ident(name) =>
incCounter(typedIdentCount)
if ((name == nme.WILDCARD && (mode & (PATTERNmode | FUNmode)) == PATTERNmode) ||
(name == tpnme.WILDCARD && (mode & TYPEmode) != 0))
tree setType makeFullyDefined(pt)
else
typedIdent(name)
case ReferenceToBoxed(idt @ Ident(_)) =>
val id1 = typed1(idt, mode, pt) match { case id: Ident => id }
// [Eugene] am I doing it right?
val erasedTypes = phaseId(currentPeriod) >= currentRun.erasurePhase.id
val tpe = capturedVariableType(idt.symbol, erasedTypes = erasedTypes)
treeCopy.ReferenceToBoxed(tree, id1) setType tpe
case Literal(value) =>
tree setType (
if (value.tag == UnitTag) UnitClass.tpe
else ConstantType(value))
case SingletonTypeTree(ref) =>
val ref1 = checkStable(
typed(ref, EXPRmode | QUALmode | (mode & TYPEPATmode), AnyRefClass.tpe))
tree setType ref1.tpe.resultType
case SelectFromTypeTree(qual, selector) =>
val qual1 = typedType(qual, mode)
if (qual1.tpe.isVolatile) TypeSelectionFromVolatileTypeError(tree, qual)
else typedSelect(qual1, selector)
case CompoundTypeTree(templ) =>
typedCompoundTypeTree(templ)
case AppliedTypeTree(tpt, args) =>
typedAppliedTypeTree(tpt, args)
case TypeBoundsTree(lo, hi) =>
val lo1 = typedType(lo, mode)
val hi1 = typedType(hi, mode)
treeCopy.TypeBoundsTree(tree, lo1, hi1) setType TypeBounds(lo1.tpe, hi1.tpe)
case etpt @ ExistentialTypeTree(_, _) =>
val tree1 = typerWithLocalContext(context.makeNewScope(tree, context.owner)){
_.typedExistentialTypeTree(etpt, mode)
}
checkExistentialsFeature(tree1.pos, tree1.tpe, "the existential type")
tree1
case dc@TypeTreeWithDeferredRefCheck() => dc // TODO: should we re-type the wrapped tree? then we need to change TypeTreeWithDeferredRefCheck's representation to include the wrapped tree explicitly (instead of in its closure)
case tpt @ TypeTree() =>
if (tpt.original != null)
tree setType typedType(tpt.original, mode).tpe
else
// we should get here only when something before failed
// and we try again (@see tryTypedApply). In that case we can assign
// whatever type to tree; we just have to survive until a real error message is issued.
tree setType AnyClass.tpe
case Import(expr, selectors) =>
assert(forInteractive, "!forInteractive") // should not happen in normal circumstances.
tree setType tree.symbol.tpe
case _ =>
abort("unexpected tree: " + tree.getClass + "\n" + tree)//debug
}
}
/**
* @param tree ...
* @param mode ...
* @param pt ...
* @return ...
*/
def typed(tree: Tree, mode: Int, pt: Type): Tree = {
lastTreeToTyper = tree
indentTyping()
var alreadyTyped = false
try {
if (Statistics.enabled) {
val t = currentTime()
if (pendingTreeTypes.nonEmpty) {
microsByType(pendingTreeTypes.head) += ((t - typerTime) / 1000).toInt
}
typerTime = t
pendingTreeTypes = tree.getClass :: pendingTreeTypes
}
if (context.retyping &&
(tree.tpe ne null) && (tree.tpe.isErroneous || !(tree.tpe <:< pt))) {
tree.tpe = null
if (tree.hasSymbol) tree.symbol = NoSymbol
}
alreadyTyped = tree.tpe ne null
var tree1: Tree = if (alreadyTyped) tree else {
printTyping(
ptLine("typing %s: pt = %s".format(ptTree(tree), pt),
"undetparams" -> context.undetparams,
"implicitsEnabled" -> context.implicitsEnabled,
"enrichmentEnabled" -> context.enrichmentEnabled,
"mode" -> modeString(mode),
"silent" -> context.bufferErrors,
"context.owner" -> context.owner
)
)
val tree1 = typed1(tree, mode, dropExistential(pt))
printTyping("typed %s: %s%s".format(
ptTree(tree1), tree1.tpe,
if (isSingleType(tree1.tpe)) " with underlying "+tree1.tpe.widen else "")
)
tree1
}
tree1.tpe = addAnnotations(tree1, tree1.tpe)
val result = if (tree1.isEmpty) tree1 else adapt(tree1, mode, pt, tree)
if (!alreadyTyped) {
printTyping("adapted %s: %s to %s, %s".format(
tree1, tree1.tpe.widen, pt, context.undetparamsString)
) //DEBUG
}
if (!isPastTyper) signalDone(context.asInstanceOf[analyzer.Context], tree, result)
result
} catch {
case ex: TypeError =>
tree.tpe = null
// The only problematic case are (recoverable) cyclic reference errors which can pop up almost anywhere.
printTyping("caught %s: while typing %s".format(ex, tree)) //DEBUG
reportTypeError(context, tree.pos, ex)
setError(tree)
case ex: Exception =>
if (settings.debug.value) // @M causes cyclic reference error
Console.println("exception when typing "+tree+", pt = "+pt)
if (context != null && context.unit.exists && tree != null)
logError("AT: " + (tree.pos).dbgString, ex)
throw ex
}
finally {
deindentTyping()
if (Statistics.enabled) {
val t = currentTime()
microsByType(pendingTreeTypes.head) += ((t - typerTime) / 1000).toInt
visitsByType(pendingTreeTypes.head) += 1
typerTime = t
pendingTreeTypes = pendingTreeTypes.tail
}
}
}
def atOwner(owner: Symbol): Typer =
newTyper(context.make(context.tree, owner))
def atOwner(tree: Tree, owner: Symbol): Typer =
newTyper(context.make(tree, owner))
/** Types expression or definition <code>tree</code>.
*
* @param tree ...
* @return ...
*/
def typed(tree: Tree): Tree = {
val ret = typed(tree, EXPRmode, WildcardType)
ret
}
def typedPos(pos: Position)(tree: Tree) = typed(atPos(pos)(tree))
// TODO: see if this formulation would impose any penalty, since
// it makes for a lot less casting.
// def typedPos[T <: Tree](pos: Position)(tree: T): T = typed(atPos(pos)(tree)).asInstanceOf[T]
/** Types expression <code>tree</code> with given prototype <code>pt</code>.
*
* @param tree ...
* @param pt ...
* @return ...
*/
def typed(tree: Tree, pt: Type): Tree =
typed(tree, EXPRmode, pt)
/** Types qualifier <code>tree</code> of a select node.
* E.g. is tree occurs in a context like <code>tree.m</code>.
*/
def typedQualifier(tree: Tree, mode: Int, pt: Type): Tree =
typed(tree, EXPRmode | QUALmode | POLYmode | mode & TYPEPATmode, pt) // TR: don't set BYVALmode, since qualifier might end up as by-name param to an implicit
/** Types qualifier <code>tree</code> of a select node.
* E.g. is tree occurs in a context like <code>tree.m</code>.
*/
def typedQualifier(tree: Tree, mode: Int): Tree =
typedQualifier(tree, mode, WildcardType)
def typedQualifier(tree: Tree): Tree = typedQualifier(tree, NOmode, WildcardType)
/** Types function part of an application */
def typedOperator(tree: Tree): Tree =
typed(tree, EXPRmode | FUNmode | POLYmode | TAPPmode, WildcardType)
/** Types a pattern with prototype <code>pt</code> */
def typedPattern(tree: Tree, pt: Type): Tree = {
// We disable implicits because otherwise some constructs will
// type check which should not. The pattern matcher does not
// perform implicit conversions in an attempt to consummate a match.
// on the one hand,
// "abc" match { case Seq('a', 'b', 'c') => true }
// should be ruled out statically, otherwise this is a runtime
// error both because there is an implicit from String to Seq
// (even though such implicits are not used by the matcher) and
// because the typer is fine with concluding that "abc" might
// be of type "String with Seq[T]" and thus eligible for a call
// to unapplySeq.
// on the other hand, we want to be able to use implicits to add members retro-actively (e.g., add xml to StringContext)
// as a compromise, context.enrichmentEnabled tells adaptToMember to go ahead and enrich,
// but arbitrary conversions (in adapt) are disabled
// TODO: can we achieve the pattern matching bit of the string interpolation SIP without this?
context.withImplicitsDisabledAllowEnrichment(typed(tree, PATTERNmode, pt))
}
/** Types a (fully parameterized) type tree */
def typedType(tree: Tree, mode: Int): Tree =
typed(tree, forTypeMode(mode), WildcardType)
/** Types a (fully parameterized) type tree */
def typedType(tree: Tree): Tree = typedType(tree, NOmode)
/** Types a higher-kinded type tree -- pt denotes the expected kind*/
def typedHigherKindedType(tree: Tree, mode: Int, pt: Type): Tree =
if (pt.typeParams.isEmpty) typedType(tree, mode) // kind is known and it's *
else typed(tree, HKmode, pt)
def typedHigherKindedType(tree: Tree, mode: Int): Tree =
typed(tree, HKmode, WildcardType)
def typedHigherKindedType(tree: Tree): Tree = typedHigherKindedType(tree, NOmode)
/** Types a type constructor tree used in a new or supertype */
def typedTypeConstructor(tree: Tree, mode: Int): Tree = {
val result = typed(tree, forTypeMode(mode) | FUNmode, WildcardType)
val restpe = result.tpe.normalize // normalize to get rid of type aliases for the following check (#1241)
if (!phase.erasedTypes && restpe.isInstanceOf[TypeRef] && !restpe.prefix.isStable && !context.unit.isJava) {
// The isJava exception if OK only because the only type constructors scalac gets
// to see are those in the signatures. These do not need a unique object as a prefix.
// The situation is different for new's and super's, but scalac does not look deep
// enough to see those. See #3938
ConstructorPrefixError(tree, restpe)
} else {
//@M fix for #2208
// if there are no type arguments, normalization does not bypass any checks, so perform it to get rid of AnyRef
if (result.tpe.typeArgs.isEmpty) {
// minimal check: if(result.tpe.typeSymbolDirect eq AnyRefClass) {
// must expand the fake AnyRef type alias, because bootstrapping (init in Definitions) is not
// designed to deal with the cycles in the scala package (ScalaObject extends
// AnyRef, but the AnyRef type alias is entered after the scala package is
// loaded and completed, so that ScalaObject is unpickled while AnyRef is not
// yet defined )
// !!! TODO - revisit now that ScalaObject is gone.
result setType(restpe)
} else { // must not normalize: type application must be (bounds-)checked (during RefChecks), see #2208
// during uncurry (after refchecks), all types are normalized
result
}
}
}
def typedTypeConstructor(tree: Tree): Tree = typedTypeConstructor(tree, NOmode)
def computeType(tree: Tree, pt: Type): Type = {
// macros employ different logic of `computeType`
assert(!context.owner.isTermMacro, context.owner)
val tree1 = typed(tree, pt)
transformed(tree) = tree1
val tpe = packedType(tree1, context.owner)
checkExistentialsFeature(tree.pos, tpe, "inferred existential type")
tpe
}
def computeMacroDefType(tree: Tree, pt: Type): Type = {
assert(context.owner.isTermMacro, context.owner)
assert(tree.symbol.isTermMacro, tree.symbol)
assert(tree.isInstanceOf[DefDef], tree.getClass)
val ddef = tree.asInstanceOf[DefDef]
val tree1 =
if (transformed contains ddef.rhs) {
// macro defs are typechecked in `methodSig` (by calling this method) in order to establish their link to macro implementation asap
// if a macro def doesn't have explicitly specified return type, this method will be called again by `assignTypeToTree`
// here we guard against this case
transformed(ddef.rhs)
} else {
val tree1 = typedMacroBody(this, ddef)
transformed(ddef.rhs) = tree1
tree1
}
val isMacroBodyOkay = !tree.symbol.isErroneous && !(tree1 exists (_.isErroneous))
val shouldInheritMacroImplReturnType = ddef.tpt.isEmpty
if (isMacroBodyOkay && shouldInheritMacroImplReturnType) computeMacroDefTypeFromMacroImpl(ddef, tree.symbol, tree1.symbol) else AnyClass.tpe
}
def transformedOr(tree: Tree, op: => Tree): Tree = transformed.get(tree) match {
case Some(tree1) => transformed -= tree; tree1
case None => op
}
def transformedOrTyped(tree: Tree, mode: Int, pt: Type): Tree = transformed.get(tree) match {
case Some(tree1) => transformed -= tree; tree1
case None => typed(tree, mode, pt)
}
/*
def convertToTypeTree(tree: Tree): Tree = tree match {
case TypeTree() => tree
case _ => TypeTree(tree.tpe)
}
*/
}
}
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