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Make overloading, defaults restriction PolyType aware
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Named/Default args levies an implementation restriction that
only one overloaded alternative may declare defaults.
But, this restriction failed to consider polymorphic methods.
Rather than matching on MethodType, this commit uses `Type#paramms`,
which handles PolyTypes and curried MethodTypes in one fell swoop.
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Dotless type application for infix operators.
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When you have an aesthetic expresion like
def f(xs: Iterator[Int]) = (
xs takeWhile (_ < 1000)
map (_ * -1)
filter (_ % 2 == 0)
flatMap (x => List(x, x))
reduceOption (_ + _)
maxBy (_.toString)
)
And then for whatever reason you have to perform explicit
type application in the midst of that expression, it's
aggravating in the extreme that it has (had) to be rewritten
in its entirety to accommodate that change.
So now you can perform type application in the middle of it.
For reasons not entirely clear to me postfix operators are
excluded. The discussion as well as the approval for the infix
variation of it can be found at:
https://groups.google.com/forum/#!msg/scala-language/eJl1wnkEz9M/hR984-lqC5EJ
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SI-6253 HashSet should implement union
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Implements of HashSet.union that reuses the two trees as much as
possible when calculating the union of two sets. This leads to significant
performance improvements as well as to much better structural sharing.
There is a comprehensive correctness test for union since there was not a single test
for HashSet.union before. In addition, there are some tests of the desirable
properties of the new implementation (structural sharing and efficiency
regarding calls of key.hashCode).
The other operations diff and intersect, which are conceptually very
similar to union, are also implemented along with comprehensive test cases
for both correctness and structural sharing.
Note that while it appears that there is some code duplication between the
three methods, they are sufficiently different that it is not possible
to merge them into one without sacrificing performance.
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improvements to GenBCode
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The assert in question was aimed at ruling out
gotos (ie "jumping-applys") in actual argument position
of a jumping-apply.
But the assert in question went overboard
to also rule out a LabelDef in actual argument position.
This commit removes the assert in question altogether.
The unwanted behaviors, and only those, are rule out by
the test added in this commit and the existing tests for SI-6089.
See also https://issues.scala-lang.org/browse/SI-7749
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Range bug: Wrong result for Long.MinValue to Long.MaxValue by In...
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Int.MaxValue
Fixed by rewriting the entire logic for the count method. This is necessary because the old code was making all kinds of assumptions about what numbers were, but the interface is completely generic.
Those assumptions still made have been explicitly specified. Note that you have to make some or you end up doing a binary search, which is not exactly fast.
The existing routine is 10-20% slower than the old (broken) one in the worst cases. This seems close enough to me to not bother special-casing Long and BigInt, though I note that this could be done for improved performance.
Note that ranges that end up in Int ranges defer to Range for count. We can't assume that one is the smallest increment, so both endpoints and the step need to be Int.
A new JUnit test has been added to verify that the test works. It secretly contains an alternate BigInt implementation, but that is a lot slower (>5x) than Long.
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Quasiquotes used to fail to generate proper fresh identifiers for
anonymous functions like:
q"_ + _"
Due to improper initialization of FreshNameCreator in quasiquote
parser which was erroneously not preserved throughout parsing of
the code snippet but re-created on every invocation.
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Added extra ()'s to get rid of deprecation warning for inferring unit arg.
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SI-6196 - Set should implement filter
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This is the exact same algorithm as in SI-6196, with only slight
differences due to the two type arguments of HashMap.
Filter is tested by the new comparative collection test by @Ichoran, but
there is nevertheless a small correctness test in t6200 in addition to
tests of the new desirable behavior.
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Implements a version of filter and filterNot that reuses as much as
possible from the existing tree instead of building an entirely new one
like the builder-based filter does. This results in significant performance
improvements on average.
Adds a test of basic correctness of filter and filterNot as well as of the
desirable properties of the new filter implementation.
This is a collaboration between me and @Ichoran
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Quasi-comprehensive BigDecimal soundness/correctness fix.
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This fixes issues SI-6153, SI-6173, SI-6456, SI-6699, and SI-8116, along with a number of other similar possible issues.
Relevant changes include
* Changes to avoid heap explosion when working with BigInt
- to isWhole
- to hashCode
- to equals
- to BigInt's equals
* Changes to enable equality matching hashCode
- Only for sufficiently small BigInt
- For identical values with different precision
* Changes to isValidDouble
- Takes precision into account now
- New methods added to test whether even if the Double is not represented exactly, it's a representation of a certain type
- New companion methods added to allow intended expansion of Double (binary/decimal difference)
* Changes to constructor
- Null arguments are not allowed (these can throw NPEs later at awkward/unexpected times)
* New JUnit test to test all these things
* Fixed existing tests to expect new behavior
* Modified scaladocs to explain the issues
* Deprecated problematic methods
* Made application of MathContext more consistent (it is where you expect it and not where you don't)
These changes are coordinated, for the most part, hence the monolithic
commit.
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SI-8100 - prevent possible SOE during Stream#flatten.
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This commit changes stream flatten to avoid allocating a
stack frame for every stream item. Previously, flattening
a stream whose elements are mostly empty would result in
a StackOverflowException.
This commit also adds a test demonstrating the problem.
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Remove misc. @deprecated elements
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Count lines by EOLs
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The line content to display should include the whole line,
inclusive of embedded line breaks, and any control chars
should be displayed in unicode escape.
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Source lines were counted by "line break chars", including FF.
Clients of `pos.line` seem to all expect the ordinary line num,
so that is what they get.
Unicode processing now precedes line ending processing.
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Deprecate automatic () insertion in argument lists
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This promotes the () insertion warning from -Ywarn-adapted-args to a
deprecation warning. -Xfuture tunrs it into a compiler error.
Auto tupling remains unchanged for now.
The tests have been fixed the following way:
- Warnings caused by general sloppiness (Try(), Future(), ...) have been
fixed.
- Warnings which raise interesting questions (x == (), ...) received an
updated checkfile for now.
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Add tree-based code generation
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1. Problem with multiple parameter lists in annotations is resolved
2. Tests for Annotated trees are added
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def printTypeParams is modified. Tests are updated.
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SI-8132 Fix false "overrides nothing" for case class protected param
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Case class parameters that are less-than-public have an accessor
method created. In the enclosed test, we saw:
case class G extends AnyRef with T with Product with Serializable {
override <synthetic> <stable> <caseaccessor> def s$1: String = G.this.s;
<caseaccessor> <paramaccessor> private[this] val s: String = _;
override <stable> <accessor> <paramaccessor> protected def s: String = G.this.s;
...
}
This commit removes the OVERRIDE flag from the accessor method,
which avoids the spurious "overrides nothing" error.
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Implements specialized subsetOf for HashSet
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Fixes SI-7326. This also adds a basic test for subsetOf that was missing before.
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Fix non-deterministic <:< for deeply nested types
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In the interests of keeping subtyping decidable [1], 152563b
added some bookkeeping to `isSubType` to detect cycles.
However, this was based on a hash set containing instances of
`SubTypePair`, and that class had inconsistencies between its
`hashCode` (in terms of `Type#hashCode`) and `equals`
(in terms of `=:=`).
This inconsistency can be seen in:
scala> trait C { def apply: (Int @unchecked) }
defined trait C
scala> val intUnchecked = typeOf[C].decls.head.info.finalResultType
intUnchecked: $r.intp.global.Type = Int @unchecked
scala> val p1 = new SubTypePair(intUnchecked, intUnchecked)
p1: $r.intp.global.SubTypePair = Int @unchecked <:<? Int @unchecked
scala> val p2 = new SubTypePair(intUnchecked.withoutAnnotations, intUnchecked.withoutAnnotations)
p2: $r.intp.global.SubTypePair = Int <:<? Int
scala> p1 == p2
res0: Boolean = true
scala> p1.hashCode == p2.hashCode
res1: Boolean = false
This commit switches to using `Type#==`, by way of the standard
case class equality.
The risk here is that you could find a subtyping computation that
progresses in such a manner that we don't detect the cycle. It would
need to produce an infinite stream of representations for types that
were `=:=` but not `==`. If that happened, we'd fail to terminate,
rather than judging the relationship as `false`.
[1] http://research.microsoft.com/pubs/64041/fool2007.pdf
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Taken from "On Decidability of Nominal Subtyping with Variance"
(Pierce, Kennedy), which was implemented in 152563b.
Part of the implementation (SubTypePair) will be changed in the
following commit to fix the non-deterministic errors typechecking
heavily nested types involving aliases or annotations.
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reshuffles names for blackbox/whitebox contexts, changes bundle notation
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As per Jason’s feedback, this commit handles overloaded constructors
in macro bundles. The backend now checks that we have a constructor of
a correct type. The frontend now prohibits multiple constructors altogether.
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Adjusts bundle notation to read `class Bundle(val c: Context)` instead of
`class Bundle extends Macro`. This avoids calling compileLate in the
macro compiler and associated tooling problems.
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Performs the following renamings:
* scala.reflect.macros.BlackboxContext to scala.reflect.macros.blackbox.Context
* scala.reflect.macros.BlackboxMacro to scala.reflect.macros.blackbox.Macro
* scala.reflect.macros.WhiteboxContext to scala.reflect.macros.whitebox.Context
* scala.reflect.macros.WhiteboxMacro to scala.reflect.macros.whitebox.Macro
https://groups.google.com/forum/#!topic/scala-internals/MX40-dM28rk
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Improves name-based patmat.
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The advent of the named based pattern matcher brought with it
a change in the way we determine the type of the value in the
"match monad". We used to take the base type to `Option` or `Seq`
(guided by the method name in `unapply` vs `unapplySeq`), and
simply use the type argument.
Name-based patmat, instead, uses the result type of methods in the
type. For example, the element type of an Option-like extractor
result is given by the result type of the no-args `get` method.
This approach, however, swiftly runs aground when navigating the
existential atolls. Here's why:
scala> class F[_]
defined class F
scala> val tp = typeOf[Some[F[X]] forSome { type X }]
warning: there were 1 feature warning(s); re-run with -feature for details
tp: $r.intp.global.Type = scala.this.Some[F[X]] forSome { type X }
scala> tp.baseType(typeOf[Option[_]].typeSymbol).typeArgs.head
res10: $r.intp.global.Type = F[X] forSome { type X }
scala> tp.memberType(tp.member(nme.get)).finalResultType
res11: $r.intp.global.Type = F[X]
`res10` corresponds to 2.10.x approach in `matchMonadResult`.
`res11` corresponds to the new approach in `resultOfMatchingMethod`.
The last result is not wrapped by the existential type. This results
in errors like (shown under -Ydebug to turn un accurate printing of
skolems):
error: error during expansion of this match (this is a scalac bug).
The underlying error was: type mismatch;
found : _$1&0 where type _$1&0
required: _$1
(0: Any) match {
^
one error found
This commit addresses the regression in 2.10.x compatible extractors
by using the 2.10 approach for them.
The residual problem is shown in the enclosed pending test.
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Test case for SI-8045, fixed by the preceding commits.
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Name-based pattern matcher needed some hardening against
unapply methods with the right name but wrong types. Only
isEmpty methods which return Boolean are acceptable.
Catching it directly rather than indirectly also allowed
for better error messages.
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This emerges from a recent attempt to eliminate pattern matcher
related duplication and to bake the scalac-independent logic
out of it. I had in mind something a lot cleaner, but it was
a whole lot of work to get it here and I can take it no further.
Key file to admire is PatternExpander.scala, which should
provide a basis for some separation of concerns.
The bugs addressed are a CCE involving Tuple1 and an imprecise
warning regarding multiple pattern crushing.
Editorial: auto-tupling unapply results was a terrible idea which
should never have escaped from the crib. It is tantamount to
purposely throwing type safety down the toilet in the very place
where people need type safety the most. See SI-6111 and SI-6675 for
some other comments.
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junit test
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