| Commit message (Collapse) | Author | Age | Files | Lines |
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Given that in 2.11 we have upgraded our name construction facility
from `newTxxxName` to `TxxxName`, I think it’s time we retire these
implicit conversions, as they no longer save keystrokes, but continue
to present ambient danger associated with implicit conversions.
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This is the first step in disentangling api#Symbol.isPackage, which is
supposed to return false for package classes, and internal#Symbol.isPackage,
which has traditionally being used as a synonym for hasPackageFlag and
hence returned true for package classes (unlike isModule which is false
for module classes).
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SI-8188 NPE during deserialization of TrieMap
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The writer was using the constructor headf and ef instead of the internal vars hashingobj and equalityobj.
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SI-6632 ListBuffer's updated accepts negative positions
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Changed the behavior in SeqLike.updated (which would silently accept negatives and throw on empty.tail) to throw IndexOutOfBoundException.
Updated tests to verify the behavior in ListBuffer. Everything else SeqLike will come along for the ride.
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SI-8177 specializeSym must use memberInfo on high side
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When determining whether member `symLo` of `tpLo`
has a stronger type than member `symHi` of `tpHi`,
should we use memberType or memberInfo?
Well, memberType transforms (using `asSeenFrom`) `sym.tpe`,
whereas memberInfo performs the same transform on `sym.info`.
For term symbols, this ends up being the same thing (`sym.tpe == sym.info`).
For type symbols, however, the `.info` of an abstract type member
is defined by its bounds, whereas its `.tpe` is a `TypeRef` to that type symbol,
so that `sym.tpe <:< sym.info`, but not the other way around.
Thus, for the strongest (correct) result,
we should use `memberType` on the low side.
On the high side, we should use the result appropriate
for the right side of the `<:<` above (`memberInfo`).
I also optimized the method a little bit by avoiding calling memberType
if the symbol on the high side isn't eligble (e.g., it's a class).
PS: I had to add a workaround to reifyType, because
we now dealias a little less eagerly, which means
a type selection on refinement class symbols makes it to reify
this broke the t8104 tests.
I also had to update the run/t6992 test, which should now test the right thing.
Tests should be commented and/or use sensible names.
What is it testing? What is the expected outcome? We should not be left guessing.
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SI-8153 Mutation is hard, let's go shopping with an empty list
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Changed the implementation of iterator to be more robust to mutation of the underlying ListBuffer.
Added a test to make sure bug is gone.
Fixed an "unsafe" usage of ListBuffer.iterator in the compiler, and added a comment explaining the (new) policy for iterating over a changing ListBuffer.
The compiler now uses a synchronized-wrapped ArrayBuffer instead of ListBuffer, as that makes the (custom) units Iterator more natural to write (and avoids O(n) lookups).
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SI-8276 Test for cyclic error caused by (reverted) SI-1786 fix
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We reverted SI-1786 recently on the grounds that its means of
avoiding cycles (not sharpening bounds of T[_] when T is
uninitialized) caused unacceptable non-determinism (well:
compilation order dependency) to type inference.
Nary a day later, @gkossakowski hit a regression in scala-io.
Bisection revealed that it stopped working in 2dbd17a2 and
started working agiain after the revert. How's that for
prescience!
I've distilled the cyclic error in scala-io in this test
case.
I'm yet to pinpoint this, followon error, which didn't survive
the shrink ray, and only appeared in the original code:
error: java.lang.IndexOutOfBoundsException: 0
at scala.collection.LinearSeqOptimized$class.apply(LinearSeqOptimized.scala:51)
at scala.collection.immutable.List.apply(List.scala:83)
at scala.reflect.internal.tpe.TypeMaps$AsSeenFromMap.correspondingTypeArgument(TypeMaps.scala:5
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SI-8280 regression in implicit selection.
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In 2fa2db7840 I fixed a bug where applicable implicit conversions
would not be found for numeric types if one introduced any aliasing
or singleton types, for the usual reasons involving the absence of
uniform type normalization. See pos/t7228 for examples - that test
case has 20 errors in 2.10.3 but compiles in master.
An unintended side effect was making implicit search less oblivious.
It turns out that in so doing I had created ambiguity where there was
none before. Not because it was any more ambiguous, but because the
compiler now had the wits to notice the ambiguity at an earlier time.
The fix for this is not intuitive. The way the internal logic is,
we need to keep the wool over implicit search's eyes, which leads
to those unrecognized types being passed to adapt, where they are
recognized and weak subtyping suffices to be more specific. It is
sufficient for SI-7228 that weak subtyping be done correctly - the
other change, which is reverted here, was exposing the type arguments
of Function1 when a view exists as a subtype of Function1.
It is also possible this could be remedied by calling weak_<:<
somewhere which is presently <:<, but I don't know where and it
has a far greater chance of affecting something else than does
this, which is a straight reversion of a post-2.10.3 change.
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SI-8134 SI-5954 Fix companions in package object under separate comp.
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Aesthetics only.
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As the prophet once said:
"'Tis better to never do at all than to have do and undo"
Let's try that in 2.12.
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I noticed that the pos/5954d was tripping a println "assertion".
This stemmed from an inconsistency between
`TypeRef#{parents, baseTypeSeq}` for a package objects compiled
from source that also has a class file from a previous compilation
run.
I've elevated the println to a devWarning, and changed
`updatePosFlags`, the home of this evil symbol overwriting,
to invalidate the caches in the symbols info. Yuck.
I believe that this symptom is peculiar to package objects because
of the way that the completer for packages calls `parents` during
the Namer phase for package objects, before we switch the symbol
to represent the package-object-from-source. But it seems prudent
to defensively invalidate the caches for any symbol that finds its
way into `updatePosFlags`.
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The tests cases enclosed exhibited two failures modes under
separate compilation.
1. When a synthetic companion object for a case- or implicit-class
defined in a package object is called for,
`Namer#ensureCompanionObject` is used to check for an explicitly
defined companion before decided to create a synthetic one.
This lookup of an existing companion symbol by `companionObjectOf`
would locate a symbol backed by a class file which was in the
scope of the enclosing package class. Furthermore, because the
owner of that symbol is the package object class that has now
been noted as corresponding to a source file in the current
run, the class-file backed module symbol is *also* deemed to
be from the current run. (This logic is in `Run#compiles`.)
Thinking the companion module already existed, no synthetic
module was created, which would lead to a crash in extension
methods, which needs to add methods to it.
2. In cases when the code explicitly contains the companion pair,
we still ran into problems in the backend whereby the class-file
based and source-file based symbols for the module ended up in
the same scope (of the package class). This tripped an assertion
in `Symbol#companionModule`.
We get into these problems because of the eager manner in which
class-file based package object are opened in `openPackageModule`.
The members of the module are copied into the scope of the enclosing
package:
scala> ScalaPackage.info.member(nme.List)
res0: $r#59116.intp#45094.global#28436.Symbol#29451 = value List#2462
scala> ScalaPackage.info.member(nme.PACKAGE).info.member(nme.List)
res1: $r#59116.intp#45094.global#28436.Symbol#29451 = value List#2462
This seems to require a two-pronged defense:
1. When we attach a pre-existing symbol for a package object symbol
to the tree of its new source, unlink the "forwarder" symbols
(its decls from the enclosing
package class.
2. In `Flatten`, in the spirit of `replaceSymbolInCurrentScope`,
remove static member modules from the scope of the enclosing
package object (aka `exitingFlatten(nestedModule.owner)`).
This commit also removes the warnings about defining companions
in package objects and converts those neg tests to pos (with
-Xfatal-warnings to prove they are warning free.)
Defining nested classes/objects in package objects still has
a drawback: you can't shift a class from the package to the
package object, or vice versa, in a binary compatible manner,
because of the `package$` prefix on the flattened name of
nested classes. For this reason, the `-Xlint` warning about
this remains. This issue is tracked as SI-4344.
However, if one heeds this warning and incrementatlly recompiles,
we no longer need to run into a DoubleDefinition error (which
was dressed up with a more specific diagnostic in SI-5760.)
The neg test case for that bug has been converted to a pos.
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Fix pattern inference regression
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This commit does not close SI-5900. It only addresses a regression
in 2.11 prereleases caused by SI-7886.
The fix for SI-7886 was incomplete (as shown by the last commit)
and incorrect (as shown by the regression in pos/t5900a.scala and
the fact it ended up inferring type parameters.)
I believe that the key to fixing this problem will be unifying
the inference of case class constructor patterns and extractor
patterns.
I've explored that idea:
https://gist.github.com/retronym/7704153
https://github.com/retronym/scala/compare/ticket/5900
But didn't quite get there.
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qbin/scalac test/pending/neg/t7886b.scala && qbin/scala Test
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
at Test$$anon$1.accept(t7886b.scala:15)
at Test$.g(t7886b.scala:9)
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SI-8244 Fix raw type regression under separate compilation
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In #1901, handling of raw types encountered in signatures during class
file parsing was changed to work in the same manner as
`classExistentialType`, by using
`existentialAbstraction(cls.tparms, cls.tpe_*)`
But this never creates fresh existential symbols, and just sticks
the class type parameters it `quantified`:
scala> trait T[A <: String]
defined trait T
scala> val cls = typeOf[T[_]].typeSymbol
cls = trait T#101864
scala> cls.typeParams
res0 = List(type A#101865)
scala> cls.tpe_*
res1 = T#101864[A#101865]
scala> classExistentialType(cls)
res3 = T#101864[_ <: String#7209]
scala> val ExistentialType(quantified, result) = res3
List(type A#101865)
In the enclosed test case, this class type parameter was substituted
during `typeOf[X] memberType sym`, which led us unsoundly thinking
that `Raw[_]` was `Raw[X]`.
I've added a TODO comment to review the other usages of
`classExistentialType`.
Test variations include joint and separate compilation, and the
corresponding Scala-only code. All fail with type errors now,
as we expect. I've also added a distillation of a bootstrap
error that failed when I forgot to wrap the `existentialType`.
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SI-7753 InstantiateDependentMap narrows type of unstable args
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[Most of this comment and the initial fix were implemented by Jason Zaugg.
I just cleaned it up a bit.]
After a soundness fix in SI-3873, instantiation of dependent
method type results behaved differently depending on whether the argument
from which we were propagating information had a stable type
or not. This is particular to substitution into singleton types
over the parameter in question.
If the argument was stable, it was substituted into singleton
types, such as the one below in the prefix in `a.type#B`
(which is the longhand version of `a.B`)
scala> class A { type B >: Null <: AnyRef }
defined class A
scala> object AA extends A { type B = String }
defined object AA
scala> def foo(a: A): a.B = null
foo: (a: A)a.B
scala> foo(AA)
res0: AA.B = null
But what if it isn't stable?
scala> foo({def a = AA; a: A { type B <: String}})
res1: a.B = null
This commit changes that to:
scala> foo({def a = AA; a: A { type B <: String}})
res1: A{type B <: String}#B = null
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SI-8177 co-evolve more than just RefinedTypes
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We look for any prefix that has a refinement class for a type symbol.
This includes ThisTypes, which were not considered before.
pos/t8177g.scala, neg/t0764*scala now compile, as they should
Additional test cases contributed by Jason & Paul.
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`asSeenFrom` produced a typeref of the shape `T'#A` where `A` referred to a symbol
defined in a `T` of times past.
More precisely, the `TypeRef` case of `TypeMap`'s `mapOver` correctly modified a prefix
from having an underlying type of `{ type A = AIn }` to `{ type A = Int }`,
with a new symbol for `A` (now with info `Int`), but the symbol in the outer
`TypeRef` wasn't co-evolved (so it still referred to the `A` in `{ type A = AIn }`
underlying the old prefix).
`coEvolveSym` used to only look at prefixes that were directly `RefinedType`s,
but this bug shows they could also be `SingleType`s with an underlying `RefinedType`.
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A test case for a name binding progression
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I noticed the change when adapting Slick to work with
Scala 2.11 in `AbstractSourceCodeGenerator.scala`.
The behaviour changed in a70c8219.
This commit locks down the new, correct behaviour with a test.
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Avoid SOE in logicallyEnclosingMember
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We've started calling this method during higher-kinded subtyping
to ensure that variances of higher order type params in overriding
as soundly aligned.
Turns out that running this over the expansion of the SBT task
macro leads to a SOE due to a corrupt owner chain.
I've fixed that in SBT (https://github.com/sbt/sbt/pull/1113),
but we ought not crash like this.
This commit considers NoSymbol to be its own enclosing member and
logs a -Xdev warning. This is analagous to the handling of
`NoSymbol.owner`.
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SI-6736 Range.contains is wrong
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Operations are reasonable when they don't require indexing or conversion into a collection. These include head, tail, init, last, drop, take, dropWhile, takeWhile, dropRight, takeRight, span.
Tests added also to verify the new behavior.
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Removed once-used private method that was calculating ranges in error and corrected the contains method (plus improved performance).
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private vals in traits depend on composition order
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Fix for SI-7475 in #3440 took care of this one.
I nixed the old (redundant) test cases and replaced by a single run/ test,
which didn't compile until.
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`Symbol.isOverride` joins `Symbol.isLocal` in the unfortunate family
of methods for which we had to break source compatibility because of
their utter brokenness.
Apparently, `isOverride` only returns true for those symbols that have
the OVERRIDE flag set (i.e. the ones that are derived from source definitions
that have the `override` modifier specified next to them). Of course,
this is very confusing, and that’s exacerbated by the fact that we can’t
fix this behavior, because there’s `internal#Symbol.isOverride` that someone
might rely on.
Given that there’s perfectly working `Symbol.allOverriddenSymbols`,
this commit removes the `Symbol.isOverride` API altogether.
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Due to an unintended clash between `def getter: Symbol` (public reflection)
and `def getter(base: Symbol): Symbol` (internal reflection), the former
is uncallable from compiler internals and/or REPL’s power mode.
While both methods are guarded by compatibility constraints, we can’t
solve this problem radically and will have to live with it for some time
Thankfully, a replacement for `sym.getter` is quite approachable, namely:
`sym.getter(sym.owner)`.
In the meanwhile, I’ve deprecated the internal `getter` method by
renaming it to `getterIn`, also touching a nearby `superSymbol`. In the next
release we’ll be able to fix the name clash for good.
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I have finally overcome my fear of positions and got to cleaning up its
public interface.
Apparently it isn’t so bad, since there’s a sane core of methods (thanks
to whoever wrote the comments to internal#Position):
1) Checks to distinguish offsets, opaque ranges and transparent ranges
2) Essentials that inclide start, point, end and source
3) Factories that create new positions based on existing ones
It looks like methods from the 3rd group are exactly what we’ve been looking
for in SI-6931, so we have nothing to add in this commit.
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As per multiple user requests, this commit introduces a shortcut
to typecheck trees under multiple different modes: terms (EXPRmode,
was exposed in Scala 2.10) and types (TYPEmode).
Looking into the rest of a dozen of internal typechecker modes, to the
best of my knowledge, I can’t find other modes that we could expose.
FUNmode is useful, but very situational. PATTERNmode is useful, but
also situational, because we don’t expand macros inside patterns
except for whitebox extractor macros. The rest (e.g. POLYmode or TAPPmode)
are too low-level.
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As per https://groups.google.com/forum/#!topic/scala-internals/8v2UL-LR9yY,
annotations don’t have to be represented as AnnotationInfos and can be
reduced to plain Trees.
Due to compatibility reasons and because of the limitations of the cake
pattern used in implementing current version of Reflection, we can’t
just say `type Annotation = Tree`, however what we can definitely do is
to deprecate all the methods on Annotation and expose `tree: Tree` instead.
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Back then when we planned to introduce type macros, we relaxed the type
of DefDef.name from TermName to Name in order to potentially be able to
accommodate type names for type macros.
Since then, type macros have been cancelled (and, for the record, my
implementation of type macros in paradise 1.0 didn’t involve DefDefs
with TypeNames), and we’ve rolled back the change to DefDef.name.
What we forgot to do, however, was to change the type of ValOrDefDef.name,
which is taken care of in this commit.
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While playing with tests for Type.companionType, I figured out that
companionSymbol isn’t what it seems to be:
scala> ScalaPackage.companionSymbol
res5: $r.intp.global.Symbol = <none>
scala> ScalaPackageClass.companionSymbol
res6: $r.intp.global.Symbol = package scala
Or even funnier observation:
scala> class C; object C
defined class C
defined object C
scala> val classC = typeOf[C].typeSymbol
classC: $r.intp.global.Symbol = class C
scala> val moduleC = classC.companionSymbol
moduleC: $r.intp.global.Symbol = object C
scala> classC.companionSymbol == moduleC
res0: Boolean = true
scala> moduleC.companionSymbol == classC
res1: Boolean = true
scala> moduleC.moduleClass.companionSymbol == moduleC
res2: Boolean = true
Of course, I rushed to clean this up, so that `companionSymbol` only
returns something other than NoSymbol if the target has a companion in
the common sense, not wrt the internal “class with the same name in the
same package” convention of scalac, and that `companionSymbol` for
module classes is a class, not a source module.
Unfortunately it’s not that easy, because api.Symbol#companionSymbol
has the same name as internal.Symbol#companionSymbol, so we can’t change
the behavior of the former without changing the behavior of the latter.
Therefore I deprecated api.Symbol#companionSymbol and introduced a replacement
called api.Symbol#companion with sane semantics.
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Introduces a dedicated facility to go from a type to a type of its companion.
Previously we had to do something really horrible for that, something like:
tp.typeSymbol.companionSymbol.typeSignature.
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As per Jason’s request, Type now features such important convenience
methods as typeArgs, typeParams, paramss, resultType and finalResultType
without requiring to perform any casts.
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It’s very probable that this is the single most requested method in the
entire reflection API of Scala 2.10.
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