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`originalInfo` can return null for stub symbols; deal with that
as we used to before a regression in 016bc3db.
After this change, we can once again delete A_1.class and still compile
code instantiating B_1. (A_1 is only referred to in a method signature
of B_1 which is not called from our code.)
scala> new B_1
warning: Class A_1 not found - continuing with a stub.
res0: B_1 = B_1@5284b8f9
In practice, this situation arises when someone uses a third
party class that was compiled against other libraries not avaialable
on the current compilation classpath.
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Conflicts:
src/partest/scala/tools/partest/DirectTest.scala
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SI-7558 Fix capture of free local vars in toolbox compiler
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It was creating an `ObjectRef[<notype>]` because of a small
bug in `capturedVariableType`.
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SI-7556 Fix runtime reflection involving ScalaLongSignature
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Scala type information is stored in classfiles in encoded in a String
in the ScalaSignature annotation. When it is too big for a single
String, it is split into an array of Strings in a different annotation,
ScalaLongSignature.
The enclosed test, with a class containing 3000 methods, uses the latter.
It exposes a bug in the way runtime reflection decodes that data.
It must concatentate and *then* decode, rather that the other way around.
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Many of our core types have dedicated sentinels which serve
perfectly to communicate "no value", even more perfectly than
None. Saving a billion allocations is gravy.
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Backport from paradise/macros
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Previous version of the MacroImplReference extractor didn't take into
the account the fact that RefTree.qualifier.symbol can be null (and it can
be null if RefTree is an Ident, because then qualifier is an EmptyTree).
This led to NPEs for really weird macro defs that refer to local methods
as their corresponding macro impls. Now I check for this corner case,
and the stuff now longer crashes.
This was wrong; this is how I fixed it; the world is now a better place.
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Cache the most recently created SubstTypeMap.
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I discovered that a 1-element cache for SubstTypeMaps
gave a 75-90% hit rate.
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SI-7149 Use a WeakHashSet for type uniqueness
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perRunCaches was using a HashMap of WeakReferences which meant it would
accumulate WeakReferences over time. This commit uses a WeakHashSet
instead so that the references are cleaned up.
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Currently type uniqueness is done via a HashSet[Type], but
that means the Types live through an entire compile session, even
ones that are used once. The result is a huge amount of unnecessarily
retained memory. This commit uses a WeakHashSet instead so that Types
and their WeakReferences are cleaned up when no longer in use.
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Replaces scala.reflect.internal.WeakHashSet with a version that
* extends the mutable.Set trait
* doesn't leak WeakReferences
* is unit tested
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* pr/merge-2.10.2:
SI-7375 ClassTag for value class aliases
SI-7507 Fix lookup of private[this] member in presence of self type.
SI-7532 Fix regression in Java inner classfile reader
SI-7517 Fix higher kinded type inference regression
SI-7516 Revert "SI-7234 Make named args play nice w. depmet types"
A test case for a recent LUB progression.
SI-7421 remove unneeded extra-attachement in maven deploy
SI-7486 Regressions in implicit search.
SI-7509 Avoid crasher as erronous args flow through NamesDefaults
SI-6138 Centralize and refine detection of `getClass` calls
SI-7497 Fix scala.util.Properties.isMac
SI-7473 Bad for expr crashes postfix
Increase build.number to 2.10.3
SI-7391 Always use ForkJoin in Scala actors on ... ... Java 6 and above (except when the porperty actors.enableForkJoin says otherwise)
Reimplementing much of the DefaultPromise methods Optimizations: 1) Avoiding to call 'synchronized' in tryComplete and in tryAwait 2) Implementing blocking by using an optimized latch so no blocking ops for non-blockers 3) Reducing method size of isCompleted to be cheaper to inline 4) 'result' to use Try.get instead of patmat
c.typeCheck(silent = true) now suppresses ambiguous errors
Conflicts:
bincompat-backward.whitelist.conf
bincompat-forward.whitelist.conf
src/compiler/scala/reflect/macros/contexts/Typers.scala
src/compiler/scala/reflect/reify/package.scala
src/compiler/scala/tools/nsc/symtab/classfile/ClassfileParser.scala
src/compiler/scala/tools/nsc/typechecker/NamesDefaults.scala
src/compiler/scala/tools/nsc/typechecker/Typers.scala
src/compiler/scala/tools/reflect/ToolBoxFactory.scala
src/library/scala/concurrent/impl/Promise.scala
src/reflect/scala/reflect/internal/Types.scala
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* origin/2.10.2:
SI-7532 Fix regression in Java inner classfile reader
SI-7517 Fix higher kinded type inference regression
SI-7516 Revert "SI-7234 Make named args play nice w. depmet types"
SI-7486 Regressions in implicit search.
SI-7509 Avoid crasher as erronous args flow through NamesDefaults
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- Discovered in 2.10.2-RC1
- Ostensibly regressed in 7e52fb910b, which conceptually reverted
part of 0cde930b so that (mutable) TypeVars don't use structural equality.
- But, does *not* fail if 7e52fb910b is cherry-picked directly after 0cde930b,
suggesting that it shone a light on a behaviour change in some other commit
in between the two.
- Indeed, the true regression came in https://github.com/scala/scala/commit/e5da30b843#L5L3176
- A targeted revert of e5da30b843 is undesirable, as we'd like SI-6846 to stay fixed
What's happening here? In the enclosed test case, higher kinded type
inference explores two possibilities:
Composed.this.Split[A]
K[[T]A[B[T]]] // `Split[A]` dealiased
The difference in the flow of type inference can be seen from the diff
below. Notice how now we no longer register `?K.addBound(Composed.this.Split)`,
we instead only register `?K.addBound(K)`
```patch
--- sandbox/old.log 2013-05-30 00:27:34.000000000 +0200
+++ sandbox/new.log 2013-05-30 00:28:28.000000000 +0200
@@ -1,55 +1,114 @@
?K.unifyFull(Composed.this.Split[A])
?K.unifySpecific(Composed.this.Split[A])
- ?K.addBound(Composed.this.Split)
?B.unifyFull(T)
?B.unifySpecific(T)
`-> false
?B.unifyFull(Any)
?B.unifySpecific(Any)
`-> false
`-> false
?K.unifySpecific(L[[T]A[B[T]]])
- ?K.addBound(L)
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
+ ?K.addBound(L)
`-> true
?K.unifyFull(Composed.this.Split[A])
?K.unifySpecific(Composed.this.Split[A])
- ?K.addBound(Composed.this.Split)
?B.unifyFull(x)
?B.unifySpecific(x)
`-> false
`-> false
?K.unifySpecific(L[[T]A[B[T]]])
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
?K.addBound(L)
+ `-> true
+?K.unifyFull(Composed.this.Split[A])
+ ?K.unifySpecific(Composed.this.Split[A])
+ ?B.unifyFull(T)
+ ?B.unifySpecific(T)
+ `-> false
+ ?B.unifyFull(Any)
+ ?B.unifySpecific(Any)
+ `-> false
+ `-> false
+ ?K.unifySpecific(L[[T]A[B[T]]])
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
?B.unifyFull(B[T])
?B.unifySpecific(B[T])
?B.addBound(B)
`-> true
+ ?K.addBound(L)
+ `-> true
+?K.unifyFull(Composed.this.Split[A])
+ ?K.unifySpecific(Composed.this.Split[A])
+ ?B.unifyFull(x)
+ ?B.unifySpecific(x)
+ `-> false
+ `-> false
+ ?K.unifySpecific(L[[T]A[B[T]]])
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
+ ?B.unifyFull(B[T])
+ ?B.unifySpecific(B[T])
+ ?B.addBound(B)
+ `-> true
+ ?K.addBound(L)
+ `-> true
+?K.unifyFull(L[A])
+ ?K.unifySpecific(L[A])
+ ?K.addBound(L)
+ `-> true
+?K.unifyFull(L[A])
+ ?K.unifySpecific(L[A])
+ ?K.addBound(L)
`-> true
```
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In the following code:
trait Cake extends Slice
trait Slice { self: Cake => // must have self type that extends `Slice`
private[this] val bippy = () // must be private[this]
locally(bippy)
}
`ThisType(<Slice>)`.findMember(bippy)` excluded the private local member on
the grounds that the first class in the base type sequence, `Cake`, was
not contained in `Slice`.
scala> val thisType = typeOf[Slice].typeSymbol.thisType
thisType: $r.intp.global.Type = Slice.this.type
scala> thisType.baseClasses
res6: List[$r.intp.global.Symbol] = List(trait Cake, trait Slice, class Object, class Any)
This commit changes `findMember` to use the symbol of the `ThisType`, rather
than the first base class, as the location of the selection.
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`getClass` is special cased in the compiler; this is described
in in the comments on `Definitions.Any_getClass`.
Part of this happens in `Typer#stabilize`. This was trying to determine
if an Ident or Select node was a call to `getClass` by merits of the name
of the tree's symbol and by checking that the its type (if it was a
MethodType or PolyType) had no parameters in the primary parameter list.
Overloaded user defined `getClass` methods confused this check. In the
enclosed test case, the tree `definitions.this.getClass` had an
`OverloadedType`, and such types always report an empty list of `params`.
This commit:
- changes `stabilize` to use `isGetClass`, rather than the
homebrew check
- changes `isGetClass` to consider a `Set[Symbol]` containing all
`getClass` variants. This moves some similar code from `Erasure`
to `Definitions`
- keeps a fast negative path in `isGetClass` based on the symbol's name
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[backport #1727] SI-7359 cyclic nested java class
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The original commit message (from 54a84a36d5):
SI-6548 reflection correctly enters jinners
When completing Java classes, runtime reflection enumerates their
fields, methods, constructors and inner classes, loads them and
enters them into either the instance part (ClassSymbol) or the
static part (ModuleSymbol).
However unlike fields, methods and constructors, inner classes don't
need to be entered explicitly - they are entered implicitly when
being loaded.
This patch fixes the double-enter problem, make sure that enter-on-load
uses the correct owner, and also hardens jclassAsScala against double
enters that can occur in a different scenario.
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The optimizer behaves unexpectedly smartly, stripping off unused private
methods. Unfortunately, sometimes private methods might be compiled down
to public Java methods, so stripping them off might lead to binary
incompatibilities.
This particular commit recovers from this problem caused by
https://github.com/scala/scala/commit/5e715396af.
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This reverts commit 14534c693d2eb6acafaf8244c14b5643388fbd67.
It turns out this approach was breaking the working variations
in the submitted test case even as it was unbreaking the unworking
one, but I never managed to uncomment them. Fortunately retronym's
test case was not so lackadaisical.
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SI-7520 bug in subtyping.
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isSubType, if given two SingleTypes, would check =:= and
stop there. It is necessary to continue with weakening the left
hand side, because (for instance) the singleton type on the
left hand side could be a refinement class carrying parents
which are themselves single or constant types.
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Gave isSubType and isSameType a more closely parallel
structure to reduce both current and future duplication.
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Utilizes TriState from previous commit. Consolidates code
which had been duplicated across isSubType and isSameType.
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Sometimes true and false aren't enough.
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SI-7517 type constructors too eagerly normalized.
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I think 403eadd0f1 was largely a symptomatic remedy
(not that we shouldn't harden against such outcomes)
and that this commit gets closer to the root causes.
The unanticipated change to test/files/run/t6113.check
is like a cry of support from the jury box.
-Foo[[X](Int, X)]
+Foo[AnyRef{type l[X] = (Int, X)}#l]
We should continue to look at calls to normalize with
grave suspicion.
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Backport from paradise/macros
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Upgrades the way that macro defs are compiled by factoring out most of
the logic in typedMacroBody and related errors in ContextErrors into an
standalone cake. This leads to tighter cohesion and better code reuse
as the cake is isolated from the rest of the compiler and is much easier
to evolve than just a method body.
Increased convenience of coding macro compilation allowed me to further
clarify the implementation of the macro engine (e.g. take a look at
Validators.scala) and to easily implement additional features, namely:
1) Parameters and return type of macro implementations can now be plain
c.Tree's instead of previously mandatory c.Expr's. This makes macros more
lightweight as there are a lot of situations when one doesn't need to
splice macro params (the only motivation to use exprs over trees). Also
as we're on the verge of having quasiquotes in trunk, there soon will be
no reason to use exprs at all, since quasiquotes can splice everything.
2) Macro implementations can now be defined in bundles, standalone cakes
built around a macro context: http://docs.scala-lang.org/overviews/macros/bundles.html.
This further reduces boilerplate by simplifying implementations complex
macros due to the fact that macro programmers no longer need to play
path-dependent games to use helpers.
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Introduces better names, factors out recreation of symbols, trees, types
and completes into separate methods, so that they can be overridden in
specialized importers.
The original motivation for this refactoring was to support JIT
compilation of macros, but I think that most of the introduced
improvements to code quality will be useful in trunk.
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Macro impl bindings now store more information in signatures.
Previously it was a flattened List[Int] corresponding to flattened paramss,
now it's List[List[Int]] to preserve the lengths of parameter lists.
Also now we distinguish between c.Expr parameters and others.
Previously actual and reference macro signatures were represented as
tuples of vparamss, rets, and sometimes tparams. Now they are all
abstracted behind MacroImplSig.
Finally this patch provides better error messages in cases of
argsc <-> paramsc and argc <-> paramc mismatches.
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Now that we have a mechanism to declare not implemented macros, let's put
it to good use by reducing the amount of magic applied to fast track.
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SI-7088 Array crasher in erasure.
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The usual business where half our pattern matches are missing
half the necessary cases.
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Optimistically, this is preparation for a day when we don't
let numeric types drift with the winds. Even without the optimism
it's a good idea. It flushed out an undocumented change in
the math package object relative to the methods being forwarded (a
type is widened from what is returned in java) so I documented
the intentionality of it.
Managing type coercions manually is a bit tedious, no doubt,
but it's not tedious enough to warrant abandoning type safety
just because java did it.
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The "For convenience, these are usable as stub implementations"
bit has generated surprisingly few angry letters, but I noticed
today it blows it on raw types. Or, used to blow it.
/** As seen from class Sub, the missing signatures are as follows.
* For convenience, these are usable as stub implementations.
* (First one before this commitw as 'def raw(x$1: M_1)'
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def raw(x$1: M_1[_ <: String]): Unit = ???
def raw(x$1: Any): Unit = ???
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Concision contribution.
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We have lots of core classes for which we need not go through
the symbol to get the type:
ObjectClass.tpe -> ObjectTpe
AnyClass.tpe -> AnyTpe
I updated everything to use the concise/direct version,
and eliminated a bunch of noise where places were calling
typeConstructor, erasedTypeRef, and other different-seeming methods
only to always wind up with the same type they would have received
from sym.tpe. There's only one Object type, before or after erasure,
with or without type arguments.
Calls to typeConstructor were especially damaging because (see
previous commit) it had a tendency to cache a different type than
the type one would find via other means. The two types would
compare =:=, but possibly not == and definitely not eq. (I still
don't understand what == is expected to do with types.)
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Try to prevent TypeSymbols from caching a different typeref
for tpe_* and typeConstructor if the symbol is monomorphic.
I find this undesirable:
scala> AnyRefClass.tpe eq AnyRefClass.typeConstructor
res0: Boolean = true
scala> AnyRefClass.tpe eq AnyRefClass.typeConstructor
res1: Boolean = false
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SI-3425 erasure crash with refinement members.
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Checking that a refinement class symbol does not override
any symbols does mean it will have to be invoke reflectively;
but the converse is not true. It can override other symbols
and still have to be called reflectively, because the
overridden symbols may also be defined in refinement classes.
scala> class Foo { type R1 <: { def x: Any } ; type R2 <: R1 { def x: Int } }
defined class Foo
scala> typeOf[Foo].member(TypeName("R2")).info.member("x": TermName).overrideChain
res1: List[$r.intp.global.Symbol] = List(method x, method x)
scala> res1 filterNot (_.owner.isRefinementClass)
res2: List[$r.intp.global.Symbol] = List()
And checking that "owner.info decl name == this" only works if
name is not overloaded.
So the logic is all in "isOnlyRefinementMember" now, and
let's hope that suffices for a while.
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Moves AbstractFileClassLoader to scala-reflect.jar
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Its string name was used in ReflectionUtils and became broken after repl
got factored out. This hints that that classloader belongs to where it is
used, i.e. to scala-reflect.jar.
Moreover AbstractFile is defined in scala-reflect.jar, so it's only
logical to also define a derived classloader in scala-reflect.jar.
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