| Commit message (Collapse) | Author | Age | Files | Lines |
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Improved error messages for identically named, differently prefixed types
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janekdb/topic/2.12.x-scaladoc-spelling-corrections-2
Fix typos in compiler and reflect
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Miscellania:
Miscellania is a small island off the northernmost part
of the Fremennik Isles - RunScape Wiki
Miscellanea:
A collection of miscellaneous objects or writings - Merriam-Webster
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SI-4700 The thrilling continuation to the infix type printing saga.
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Add ability to disable this via the @showAsInfix annotation.
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```
scala> import scala.annotation.infix
import scala.annotation.infix
scala> @infix class &&[T, U]
defined class $amp$amp
scala> def foo: Int && Boolean = ???
foo: Int && Boolean
```
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When determining whether or not a pattern match requires an equality
check of the outer instance of a type in addition to a type test,
`needsOuterTest` determines if the intersection of the selector and
the pattern types could be populated. Both type arrive at
`isPopulated` dealised.
However, `isPopulated` recurs when it encounters an existential,
and, as seen in thest case, a failure to dealias the quantified
type can lead to an assertion failure as we try to relate a
typeref to an alias and a typeref to a class.
See also SI-7214, which added deliasing of the pattern type
before calling `isPopulated`.
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SI-2712 Add support for higher order unification
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It wasn't a good idea after all.
Also removed some tracing code that I cannot imagine
was ever used in a production compiler. It's still just
a recompile away.
Fixes scala/scala-dev#280
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SI-7046 reflection doesn't see all knownDirectSubclasses
This appears to do the right thing in the most typical scenarios in which `knownDirectSubclasses` would be used. The missing 5% is that subclasses defined in local scopes might not be seen by `knownDirectSubclasses` (see `Local` and `Riddle` in the test below). In mitigation, though, it is almost certain that a local subclass would represent an error in any scenario where `knownDirectSubclasses` might be used.
Errors for such situations are reported by recording (via a symbol attachment) that `knownDirectSubclasses` has been called and reporting an error if any additional children are added subsequently.
Despite these limitations and caveats, I believe that this represents a huge improvement over the status quo, and would eliminate 100% of the failures that I've seen in practice with people using shapeless for type class derivation.
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Clean up of code guarded by bare -Xexperimental
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During large compilations runs, the large numbers of globally unique
fresh names for existentials captured from prefixes of `asSeenFrom`.
is a) somewhat wasteful (all these names are interned in the name table)
, and, b) form a pathological case for the current implementation of
`Names#hashValue`, which leads to overfull hash-buckets in the name table.
`hashValue` should probably be improved, but my attempts to do so have
shown a small performance degradation in some benchmarks. So this commit
starts by being more frugal with these names, only uniquely naming
within an `asSeenFrom` operation.
References scala/scala-dev#246
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- clarify the intent of tests
- Consolidate stripExistentialsAndTypeVars with similar logic in
mergePrefixAndArgs
- Refactor special cases in maybeRewrap
The name isn't great, but I'm struggling to come up with
a pithy way to describe the rogue band of types.
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Lazy base type seq elements are encoded as a refined type with
an empty scope and a list of type refs over some common type
symbol that will be merged when `BaseTypeSeq#apply` is called.
The first change in this commit is to mark the creation and consumption
of such elements with calls to `[is]IntersectionTypeForBaseTypeSeq`. They
are distinguished by using the actual type symbol rather than a refinement
class symbol, which in turn simplifies the code in
`BaseTypeSeq#typeSymbol`.
I have also made `lub` aware of this encoding: it is now able to "see through"
to the parents of such refined types and merge them with other base types
of the same class symbol (even other refined types representing lazy BTS
elements.)
To make this fix work, I also had to fix a bug in LUBs of multiple with
existential types. Because of the way the recursion was structured in
`mergePrefixAndArgs`, the order of list of types being merged changed
behaviour: quantified varialbles of existential types were being rewrapped
around the resultting type, but only if we hadn't encountered the first
regular `TypeRef`.
This can be seen with the following before/after shot:
```
// 2.11.8
scala> val ts = typeOf[Set[Any]] :: typeOf[Set[X] forSome { type X <: Y; type Y <: Int}] :: Nil; def merge(ts: List[Type]) = mergePrefixAndArgs(ts, Variance.Contravariant, lubDepth(ts)); val merged1 = merge(ts); val merged2 = merge(ts.reverse); (ts.forall(_ <:< merged1), ts.forall(_ <:< merged2))
ts: List[$r.intp.global.Type] = List(Set[Any], Set[_ <: Int])
merge: (ts: List[$r.intp.global.Type])$r.intp.global.Type
merged1: $r.intp.global.Type = scala.collection.immutable.Set[_ >: Int]
merged2: $r.intp.global.Type = scala.collection.immutable.Set[_53] forSome { type X <: Int; type _53 >: X }
res0: (Boolean, Boolean) = (false,true)
// HEAD
...
merged1: $r.intp.global.Type = scala.collection.immutable.Set[_10] forSome { type X <: Int; type _10 >: X }
merged2: $r.intp.global.Type = scala.collection.immutable.Set[_11] forSome { type X <: Int; type _11 >: X }
res0: (Boolean, Boolean) = (true,true)
```
Furthermore, I have fixed the computation of the base type sequences of
existential types over refinement types, in order to maintain the invariant
that each slot of the base type sequence of a existential has the same
type symbol as that of its underlying type. Before, what I've now called
a `RefinementTypeRef` was transformed into a `RefinedType` during
rewrapping in the existential, which led to it being wrongly considered as
a lazy element of the base type sequence. The first change above should
also be sufficient to avoid the bug, but I felt it was worth cleaning up
`maybeRewrap` as an extra line of defence.
Finally, I have added another special case to `BaseTypeSeq#apply` to
be able to lazily compute elements that have been wrapped in an existential.
The unit test cases in `TypesTest` rely on these changes. A subsequent commit
will build on this foundation to make a fix to `asSeenFrom`.
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We do this during uncurry so we can insert the necessary
applications to the empty argument list. Fields is too late.
Refchecks is no longer an info transform.
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Correct caching is impossible because `sym.tpeHK.asSeenFrom(pre, sym.owner)`
may have different results even for reference-identical `sym.tpeHK` and `pre`
(even in the same period). For example, `pre` could be a `ThisType`.
For such a type, `tpThen eq tpNow` does not imply `tpThen` and `tpNow` mean
the same thing, because `tpThen.typeSymbol.info` could have been different
from what it is now, and the cache won't know simply by looking at `pre`.
Somehow this distinction never caused trouble, but when starting to desugar
module definitions during the fields phase, it causes several test failures.
I tried keying the cache on the current period to no avail.
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Cleanups related to the removal of trait impl classes
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Until now, concrete methods in traits were encoded with
"trait implementation classes".
- Such a trait would compile to two class files
- the trait interface, a Java interface, and
- the implementation class, containing "trait implementation methods"
- trait implementation methods are static methods has an explicit self
parameter.
- some methods don't require addition of an interface method, such as
private methods. Calls to these directly call the implementation method
- classes that mixin a trait install "trait forwarders", which implement
the abstract method in the interface by forwarding to the trait
implementation method.
The new encoding:
- no longer emits trait implementation classes or trait implementation
methods.
- instead, concrete methods are simply retained in the interface, as JVM 8
default interface methods (the JVM spec changes in
[JSR-335](http://download.oracle.com/otndocs/jcp/lambda-0_9_3-fr-eval-spec/index.html)
pave the way)
- use `invokespecial` to call private or particular super implementations
of a method (rather `invokestatic`)
- in cases when we `invokespecial` to a method in an indirect ancestor, we add
that ancestor redundantly as a direct parent. We are investigating alternatives
approaches here.
- we still emit trait fowrarders, although we are
[investigating](https://github.com/scala/scala-dev/issues/98) ways to only do
this when the JVM would be unable to resolve the correct method using its rules
for default method resolution.
Here's an example:
```
trait T {
println("T")
def m1 = m2
private def m2 = "m2"
}
trait U extends T {
println("T")
override def m1 = super[T].m1
}
class C extends U {
println("C")
def test = m1
}
```
The old and new encodings are displayed and diffed here: https://gist.github.com/retronym/f174d23f859f0e053580
Some notes in the implementation:
- No need to filter members from class decls at all in AddInterfaces
(although we do have to trigger side effecting info transformers)
- We can now emit an EnclosingMethod attribute for classes nested
in private trait methods
- Created a factory method for an AST shape that is used in
a number of places to symbolically bind to a particular
super method without needed to specify the qualifier of
the `Super` tree (which is too limiting, as it only allows
you to refer to direct parents.)
- I also found a similar tree shape created in Delambdafy,
that is better expressed with an existing tree creation
factory method, mkSuperInit.
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The old algorithm omitted necessary outer ref checks in some places.
This new one is more conservative. It only omits outer ref checks when
the expected type and the scrutinee type match up, or when the expected
type is defined in a static location. For this specific purpose the top
level of a method or other code block (which is not a trait or class
definition) is also considered static because it does not have a prefix.
This change comes with a spec update to clarify the prefix rule for type
patterns. The new wording makes it clear that the presence of a prefix
is to be interpreted in a *semantic* way, i.e. the existence of a prefix
determines the necessity for an outer ref check, no matter if the prefix
is actually spelled out *syntactically*. Note that the old outer ref
check implementation did not use the alternative interpretation of
requiring prefixes to be given syntactically. It never created an outer
ref check for a local class `C`, no matter if the pattern was `_: C`
or `_: this.C`, thus violating both interpretations of the spec.
There is now explicit support for unchecked matches (like
`case _: (T @unchecked) =>`) to suppress warnings for unchecked outer
refs. `@unchecked` worked before and was used for this purpose in
`neg/t7721` but never actually existed as a feature. It was a result of
a bug that prevented an outer ref check from being generated in the
first place if *any* annotation was used on an expected type in a type
pattern. This new version will still generate the outer ref check if an
outer ref is available but suppress the warning otherwise. Other
annotations on type patterns are ignored.
New tests are in `neg/outer-ref-checks`. The expected results of tests
`neg/t7171` and `neg/t7171b` have changed because the compiler now
tries to generate additional outer ref checks that were not present
before (which was a bug).
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Redeem myself for e1c732db44 -- hopefully.
I inlined `thisInfo` (== `sym.info`), and made sure to use `relativeInfo`
wherever prefix and args influence the result of the query that we're
delegating to the underlying type. For type aliases, use `normalize`
for `baseClasses` and `decls`, since `relativeInfo` breaks the gnarly SI-8177.
I think normalize is okay for aliases, as the prefix should not matter
when computing base classes, and infos for the members in `decls`
are given the `asSeenFrom` treatment individually downstream.
(It's a tight rope between rewriting too many symbols and maintaining correctness.
Documented the trade-off in the code.)
Renamed the unimaginative `transform` to `relativize`, which, although everything
is relative, hopefully says a bit more about its usage than `transform`.
Removed a lot of over-factoring in the TypeRef hierarchy. Ultimately, we need
to reduce the number of TypeRef subclasses further, I think. It's really hard
to follow what's going on.
Removed the `thisInfo` cache, since `sym.info` and `relativeInfo` are both cached.
Made the cache invalidation hooks a bit more OO-y.
Compare `Symbol`s with `eq` -- they don't define an `equals` method.
Also, don't recurse in isSubtype when a `baseType` results in `NoType`.
This happens a lot and is cheap to check, so I posit (without proof),
that it's better for performance (and clarity) to check before recursing.
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By reducing excessive factoring, we can save an extraneous call
to `asSeenFrom`, and hopefully in a following commit figure out
a bigger problem with `baseType` that is causing wrong subtyping results.
This commit is a pure refactoring, save for the dropped ASF call,
which is explained below.
To motivate the following change to `relativeInfo`:
```
private[Types] def relativeInfo = /*trace(s"relativeInfo(${safeToString}})")*/{
if (relativeInfoPeriod != currentPeriod) {
- val memberInfo = pre.memberInfo(sym)
- relativeInfoCache = transformInfo(memberInfo)
+ relativeInfoCache = memberInfoInstantiated
```
Let's consolidate the two removed line in this new method:
```
def memberInfoInstantiated = transformInfo(pre.memberInfo(sym))
```
To understand what `transformInfo` does, take these helpers spread over
various `*TypeRef` traits, and consolidate them:
```
- def asSeenFromOwner(tp: Type) = tp.asSeenFrom(pre, sym.owner)
// regular type refs:
- def transformInfo(tp: Type): Type = appliedType(asSeenFromOwner(tp), args)
// for no-args type refs:
- override def transformInfo(tp: Type): Type = appliedType(asSeenFromOwner(tp), dummyArgs)
```
By removing the dynamic dispatch, we get the following method
(given `require(args0 ne Nil, this)` in `ArgsTypeRef`,
and `args eq Nil` by construction in `NoArgsTypeRef` ):
```
def transformInfo(tp: Type) =
appliedType(tp.asSeenFrom(pre, sym.owner), if (args.isEmpty) dummyArgs else args)
```
Inlining `memberInfo`, which is defined as:
```
def memberInfo(sym: Symbol): Type = {
require(sym ne NoSymbol, this)
sym.info.asSeenFrom(this, sym.owner)
}
```
gives us:
```
def memberInfoInstantiated = transformInfo(sym.info.asSeenFrom(pre, sym.owner))
```
Inlining `transformInfo` as reworked above:
```
def memberInfoInstantiated =
appliedType(sym.info.asSeenFrom(pre, sym.owner).asSeenFrom(pre, sym.owner),
if (args.isEmpty) dummyArgs else args)
```
Whoops! One `asSeenFrom` should do...
```
+ final protected def memberInfoInstantiated: Type =
+ appliedType(sym.info.asSeenFrom(pre, sym.owner), if (args.isEmpty) dummyArgs else args)
```
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The new unit test shows failures in transitivity of subtyping
and type equivalence, which boil down the the inconsistent
handling of the semantically equivalent:
ThisType(pre, ModuleClass)
ModuleTypeRef(pre, ModuleClass)
SingleType(pre, Module)
This commit:
- adds a case to `normalizePlus` to unwrap a `ThisType` to
a `ModuleTypeRef`
- Use `normalizePlus` more widely during subtype comparison
- refactor `fourthTry` (part of `isSubType`) to remove code
that becomes obviated by the use of `normalizePlus`.
This fixes the regression in the extension methods phase which
was triggered by https://github.com/scala/scala/pull/4749.
We can also fix that regression by tweaking the extension methods
phase itself to emit the `ThisType` representation of the owner
of the value class, as before.
I plan to demonstrate the two approaches to fixing the regression
on separate branches, and the propose that the merged result of these
two is useds.
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- Language imports are preceding other imports
- Deleted empty file: InlineErasure
- Removed some unused private[parallel] methods in
scala/collection/parallel/package.scala
This removes hundreds of warnings when compiling with
"-Xlint -Ywarn-dead-code -Ywarn-unused -Ywarn-unused-import".
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The outer check was not being generated when the prefix was a
top level module. The enclosed test shows that we in fact must
synthesize the outer check in that case.
Perhaps the bug was introduced by neglecting to consider that
a module can inherit member classes.
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Comment about my poor naming choice in Types.
NullaryMethodType sounds like the method has one empty argument list,
whereas it really has no argument lists at all.
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I found another spot where I had previously needed to manually
invalidate a TypeRef cache, and modified that to route through
the newly added `invalidatedCaches`.
`invalidatedCaches` now invalidates all the other caches I could
find in our types of types. I opted for a non-OO approach here,
as we've got a fairly intricate lattice of traits in place that
define caches, and I didn't have the stomach for adding a polymorphic
`Type::invalidatedCaches` with the the right sprinkling over overrides
and super calls.
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Typechecking a pattern that defines a pattern type variable
initially assigns abstract type symbol with open type bounds.
Later on, pattern type inference kicks in to sharpen the type
of the variable based on constraints imposed by the expected
type (ie, the type of scrutinee of the pattern.)
However, before inference does this, a `TypeRef` to the abstract
type symbol can be queried for its base type with respect to some
class, which leads to it populating an internal cache. This cache
becomes stale when the underlying symbol has its type mutated.
The repercussions of this meant that a subsequent call to `baseType`
gave the wrong result (`NoType`), which lead to an `asSeenFrom`
operation to miss out of substitution of a type variable. Note the
appearance of `A` in the old type errors in the enclosed test case.
This commit takes an approach similar to 286dafbd to invalidate
caches after the mutation. I've routed both bandaids through the
same first aid kit: I'm sure over time we'll add additional calls
to this method, and additional cache invalidations within it.
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Such that uncurry can correctly un-dependify them.
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Transcript:
```
➜ scala git:(2.12.x) export MB=$(git merge-base 2.12.x 2.11.x)
➜ scala git:(2.12.x) echo $MB
0e9525aa618a2eca143a1c7379ff1e6efd23b86e
➜ scala git:(2.12.x) g log --oneline --graph $MB...2.11.x
```
Read this upside down :-). The last merge comes first,
with merge commands interspersed in the git log.
```
➜ scala git:(2.12.x) g merge 2.11.x
Auto-merging versions.properties
Auto-merging src/reflect/scala/reflect/internal/pickling/UnPickler.scala
Auto-merging src/reflect/scala/reflect/internal/Types.scala
Auto-merging src/reflect/scala/reflect/internal/TreeGen.scala
Auto-merging src/library/scala/collection/immutable/Stream.scala
Auto-merging src/library/scala/collection/convert/Wrappers.scala
Auto-merging build.xml
CONFLICT (content): Merge conflict in build.xml
Auto-merging README.md
Automatic merge failed; fix conflicts and then commit the result.
```
```
* 928e6892d4 (scala/2.11.x, 2.11.x) Merge pull request #4682 from adriaanm/jline-quick.bin
|\
| * b763dbf368 (adriaanm/jline-quick.bin, jline-quick.bin) Include jline on quick.bin tool path
* | ccded7d179 Merge pull request #4680 from janekdb/2.11.x-option
|\ \
| |/
|/|
| * 58ae3e51f7 Delegate null test to Option
|/
* a745f06e35 Merge pull request #4670 from retronym/ticket/9422
|\
| * ec95e534a2 SI-9422 Fix incorrect constant propagation
* 65fa73dff3 Merge pull request #4669 from janekdb/2.11.x-scaladoc-reflect
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| * e206a1837d ScalaDoc fixes for reflect
* | 8e7e3b4a5f Merge pull request #4667 from janekdb/2.11.x-scaladoc-library-library-aux
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| |/
|/|
| * 69c2c106fe ScalaDoc fixes for library and library-aux
* | 7de4cbc5e5 Merge pull request #4665 from lrytz/asm-504-3
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| * | cdc55c29d0 Upgrade scala-asm to 5.0.4-scala-3
|/ /
* | d8da39a197 Merge pull request #4661 from retronym/ticket/9365
|\ \
| * | 0c99742c51 SI-9365 Don't null out dependencies of transient lazy vals
| /
* | 2279d3f3d9 Merge pull request #4662 from janekdb/2.11.x-redundant-val-modifier
|\ \
| * | 173a6fad95 Remove redundant 'val' from case class params.
* | | e0d21432d6 Merge pull request #4664 from SethTisue/remove-dead-link-in-readme
|\ \ \
| |_|/
|/| |
| * | 600fc4e6e1 fix readme for death of typesafe.artifactoryonline.com
| |/
* | 7492bda816 Merge pull request #4636 from SethTisue/contributor-stuff-from-github-wiki
|\ \
| |/
|/|
| * ed5098dbc4 merge two reviewers lists in readme
| * e136e4ad47 tighten up CONTRIBUTING.md a little
| * f9ca6863d4 readme/contributor's guide tweaks
| * 80e98b03a1 tiny readme fix
| * 197845620c merge in text from pull request policy from old wiki
| * e93ca409ae drop in pull request policy from old wiki
| * 951939d1b3 contributor guide: add a morsel salvaged from GitHub wiki
* f682441f6f Merge pull request #4653 from lrytz/t9403
|\
| * 2678d349b2 SI-9403 fix ICodeReader for negative BIPUSH / SIPUSH values
```
```
➜ scala git:(2.12.x) g merge -s ours f2d7838d90
Merge made by the 'ours' strategy.
```
```
* f2d7838d90 Merge pull request #4657 from lrytz/backports
|\
| * 241bb9ac19 Rename the ENUM / DEFAULTMETHOD flags to include JAVA_
| * 7a7f9927c3 SI-9393 fix modifiers of ClassBTypes for Java annotations
| * 8946d60bd2 [backport] Fix bytecode stability when running the closure optimizer
| * 3b6b2bfe9f [backport] SI-9392 Clarify the workaround comment and introduce a devWarning
| * 091c1e6ed8 [backport] SI-9392 Avoid crash in GenBCode for incoherent trees
| * 6177cb4481 [backport] SI-9393 Temporarily disable two assertions in GenBCode
| * a1d471f7ba [backport] Refactor the ClosureOptimizer, run ProdCons only once per method
| * f5e72765f2 [backport] SI-9387 Fix VerifyError introduced by indylambda
| * 41b99e2531 [backport] Integrate the LMFInvokeDynamic extractor into LambdaMetaFactoryCall
| * fc1cda2118 [backport] Small refactoring to the closure optimizer
| * 8f272c0ad2 [backport] Accessibility checks for methods with an InvokeDynamic instruction
| * 1c1d8259b5 [backport] Fix bytecode stability
| * ef9d845676 [backport] Support methodHandle / invokeDynamic constant pool entries in scalap
| * 60747c7555 [backport] Skip mirror class when invoking deserializeLambda
| * 404e86239e [backport] Prevent infinite recursion in ProdConsAnalyzer
| * 1b0703e74d [backport] SI-9376 don't crash when inlining a closure body that throws.
| * e511375a90 [backport] Fix superclass for Java interface symbols created in JavaMirrors
| * 1b57723169 [backport] `deserializeLambda` should not use encoded class name
| * 8bafa8ed88 [backport] Java parser: default methods in interfaces are not `DEFERRED`
| * 44e2761a9b [backport] SI-6613 fixed in GenBCode
```
```
➜ scala git:(2.12.x) g merge 4c6dcfe934
Auto-merging src/scaladoc/scala/tools/nsc/doc/html/page/Template.scala
Auto-merging doc/License.rtf
Auto-merging doc/LICENSE.md
Auto-merging build.xml
Auto-merging build.sbt
Merge made by the 'recursive' strategy.
Auto packing the repository in background for optimum performance.
See "git help gc" for manual housekeeping.
build.sbt | 2 +-
build.xml | 2 +-
doc/LICENSE.md | 4 ++--
doc/License.rtf | 4 ++--
src/scaladoc/scala/tools/nsc/doc/html/page/Template.scala | 2 +-
src/scalap/decoder.properties | 2 +-
6 files changed, 8 insertions(+), 8 deletions(-)
```
```
* | 4c6dcfe934 Merge pull request #4656 from lrytz/filtersOpenJDK
|\ \
| |/
|/|
| * 0b35bc29aa Ignore OpenJDK warnings in partest filters
* 6eb0812050 Merge pull request #4644 from SethTisue/copyright-2015
* e0aac7c9ef bump copyright year to 2015
```
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merge/2.11.x-to-2.12.x-20150713
Conflicts:
src/eclipse/partest/.classpath
src/eclipse/repl/.classpath
test/files/run/nothingTypeNoFramesNoDce.scala
test/files/run/repl-javap-app.check
Also fixup two .classpath files with updated partest, xml and
parser combinators JARs.
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merge/2.11.x-to-2.12.x-20150501
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This commit corrects many typos found in scaladocs and comments.
There's also fixed the name of a private method in ICodeCheckers.
|
