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SI-5824 Fix crashes in reify with _*
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Reification crashes if "foo: _*" construct is used. This happens besause type tree is represented either with TypeTree, or with Ident (present case), and `toPreTyperTypedOrAnnotated' only matches of the former. The fix is to cover the latter too. A test is included.
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SI-6961 no structural sharing in list serialization
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Revert list serialization back to what it was in 2.9.x and before.
Partial revert of a6fcd70b60 e234978dfd, which fixed SI-5374.
The ListBuffer part of the fix remains in place.
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SI-6187 Make partial functions re-typable
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- `New(tpe)` doesn't survive a `resetAttrs` / typecheck; use
a name instead.
- Abandon the tree attachment that passed the default
case from `typer` to `patmat`; this tree eluded the
attribute reset performed in the macro. Instead, add it
to the match. Apart from making the tree re-typable, it
also exposes the true code structure to macros, which
is important if they need to perform other code
transformations.
- Install original trees on the declared types of the
parameters of the `applyOrElse` method to ensure that
references to them within the method pick up the correct
type parameter skolems upon retypechecking.
- Propagate `TypeTree#original` through `copyAttrs`,
which is called during tree duplication / `TreeCopiers`.
Without this, the original trees that we installed were
not visible anymore during `ResetAttrs`.
We are not able to reify partial functions yet -- the
particular sticking point is reification of the parentage
which is only available in the `ClassInfoType`.
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SI-6146 More accurate prefixes for sealed subtypes.
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When analysing exhaustivity/reachability of type tests
and equality tests, the pattern matcher must construct
a set of sealed subtypes based on the prefix of the
static type of and the set of sealed descendent symbols
of that type.
Previously, it was using `memberType` for this purpose.
In simple cases, this is sufficient:
scala> class C { class I1; object O { class I2 } }; object D extends C
defined class C
defined module D
scala> typeOf[D.type] memberType typeOf[C#I1].typeSymbol
res0: u.Type = D.I1
But, as reported in this bug, it fails when there is an
additional level of nesting:
scala> typeOf[D.type] memberType typeOf[c.O.I2 forSome { val c: C }].typeSymbol
res5: u.Type = C.O.I2
This commit introduces `nestedMemberType`, which uses `memberType`
recursively up the prefix chain prefix chain.
scala> nestedMemberType(typeOf[c.O.I2 forSome { val c: C }].typeSymbol, typeOf[D.type], typeOf[C].typeSymbol)
res6: u.Type = D.O.Id
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SI-7070 Turn restriction on companions in pkg objs into warning
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The implementation restriction created from SI-5954 in
3ef487ecb6733bfe3c13d89780ebcfc81f9a5ea0 has two problems.
1) The problematic code works fine if compile with sbt. That means the
restriction is breaking some people needlessly.
2) It's not binary compatible.
To fix all that this commit changes the error into a warning and removes
the setting used to get around the restriction.
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SI-5082 Cycle avoidance between case companions
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We can synthesize the case companion unapply without forcing
the info of the case class, by looking at the parameters in
the `ClassDef` tree, rather than at `sym.caseFieldAccessors`.
Access to non-public case class fields routed through the
already-renamed case accessor methods. The renamings are
conveyed via a back-channel (a per-run map, `renamedCaseAccessors`),
rather than via the types to give us enough slack to avoid
the cycle.
Some special treatment of private[this] parameters is needed
to avoid a misleading error message. Fortunately, we can
determine this without forcing the info of the case class,
by inspecting the parameter accessor trees.
This change may allow us to resurrect the case class ProductN
parentage, which was trialled but abandoned in the lead up
to 2.10.0.
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SI-7100 Fixed infinite recursion in duplicators
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SI-6113 typeOf now works for type lambdas
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It's not a problem to have an abstract type symbol in a ground type tag
if that symbol is defined in the type being reified.
This mechanics was already built in for existentials, now we extend it to
include type params of poly types.
Credit goes to @katefree
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SI-6888 Loosen criteria for $outer search.
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In order to cater for nested classes with names that end
with '$', which lead to ambiguity when unmangling expanded
names.
In:
class X { object $ }
We end up with:
orginalName(X$$$$$outer) = $$$outer
This change modifies `outerSource` to consider that to be
and outer accessor name. It is a piecemeal fix, and no doubt
there are other nasty surprises in store for those inclined to
flash their $$$ in identifier names, but the method changed is
not used widely and this solves the reported problem.
SI-2806 remains open to address the deeper problem.
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SI-7026 Asking for a parse tree will now never result in a typed tree
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This commit fixes ticket SI-7026. This makes it safe to use
parseTree outside of the presentation compiler thread.
Solved it with an implementation that just parses the source every
time without trying to memorize anything. Added tests that checks
that
1. You get a new parse tree every time you ask for one.
2. You always get a parse tree, never a typed tree.
3. A parse tree should never contain any symbols or types [1].
4. If you ask for a parse tree and then ask for a typed tree it
shouldn't change the parse tree you originally asked for, i.e.
property 3 still holds.
Additionally the parser is now only interruptible when running
on the presentation compiler thread.
[1] There is an exception to this though. Some of the nodes that
the compiler generates will actually contain symbols. I've
chosen to just ignore these special cases for now.
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Add a request to presentation compiler to fetch doc comment information.
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Refactor scaladoc base functionality to allow it to be mixed in with Global in the IDE.
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[nomaster] SI-7064 Reflection: forward compat for 2.10.1
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Makes sure that the compiler understands the 2.10.0 format of super
constructor calls after the recent revert from the typemacro-compatible
format.
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This reverts commit 40063b0009d55ed527bf1625d99a168a8faa4124.
Conflicts:
src/compiler/scala/tools/nsc/ast/parser/Parsers.scala
src/compiler/scala/tools/nsc/typechecker/Typers.scala
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This reverts commit 0ebf72b9498108e67c2133c6522c436af50a18e8.
Conflicts:
src/compiler/scala/tools/nsc/typechecker/Typers.scala
src/reflect/scala/reflect/internal/Trees.scala
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This reverts commit 02b2da63409af6a28824cbb74d00d0ec04518c8d.
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SI-7060 More conservative dead code elim marking
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In dead code elimination, a DROP instruction that gets marked as useful
and can be reached via several paths needs to also mark all the reaching
definitions as useful, else we'll get unbalanced stacks on the two paths.
A simplistic example:
```
BB1:
CALL X // useful, leaves a LONG on the stack
JUMP BB3
BB2:
LOAD_FIELD Y // not useful
JUMP BB3
BB3:
DROP LONG // useful because "CALL X" is useful
// but unless we mark "LOAD_FIELD Y" as useful too
// we'll get unbalanced stacks when reaching BB3
```
This patch addresses the unbalanced stack problem by adding all the
reaching definitions of a useful DROP as useful instructions too.
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SI-7039 unapplySeq result type independent of subpattern count
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Fixes a bug in the implementation of the `unapplySeq` part of the spec below.
An `unapply` method with result type `R` in an object `x` matches the
pattern `x(p_1, ..., p_n)` if it takes exactly one argument and, either:
- `n = 0` and `R =:= Boolean`, or
- `n = 1` and `R <:< Option[T]`, for some type `T`.
The argument pattern `p1` is typed in turn with expected type `T`.
- Or, `n > 1` and `R <:< Option[Product_n[T_1, ..., T_n]]`, for some
types `T_1, ..., T_n`. The argument patterns `p_1, ..., p_n` are
typed with expected types `T_1, ..., T_n`.
An `unapplySeq` method in an object `x` matches the pattern `x(p_1, ..., p_n)`
if it takes exactly one argument and its result type is of the form `Option[S]`,
where either:
- `S` is a subtype of `Seq[U]` for some element type `U`, (set `m = 0`)
- or `S` is a `ProductX[T_1, ..., T_m]` and `T_m <: Seq[U]` (`m <= n`).
The argument patterns `p_1, ..., p_n` are typed with expected types
`T_1, ..., T_m, U, ..., U`. Here, `U` is repeated `n-m` times.
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[nomerge] SI-6667 Demote a new ambiguity error to a lint warning.
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In the interests of not breaking source compability.
A few projects are relying on this bug.
Should not be merged to master.
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SI-7008 @throws annotations are now populated in reflect
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As per Jason's comment: How are Scala classes containing @throws annots
treated? I can't figure out whether we pickle the annotation in addition
to adding the exception to the signature. If we do, might we end up with
duplicate annotations in runtime reflection? This warrants a test.
See the context of the discussion here: https://github.com/scala/scala/pull/2040/files#r2874769.
No, we won't end up with duplicates, because classes defined in Scala
are loaded in a different completer. But I'll add a test - you can never
have too many of those.
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Apparently, the usual _1, _2, _3... naming scheme also works for java
files, which need to be compiled together with partests. This allows us
to get rid of javac-artifacts.jar.
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Runtime reflection in JavaMirrors previously forgot to fill in
@throws when importing Java reflection artifacts. Now this is fixed.
Note that generic exception types used in `throws` specifications will
be garbled (i.e. erased), because we don't use `getGenericExceptionTypes`
in favor of just `getExceptionTypes` to stay compatible with the behavior
of ClassfileParser. That's a bug, but a separate one and should be fixed
separately.
Also note that this commit updated javac-artifacts.jar, because we need
to test how reflection works with javac-produced classfiles. The sources
that were used to produce those classfiles can be found in the jar next
to the classfiles.
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SI-7033 Be symful when creating factory methods.
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Implicit class factory methods were synthesizing the
reference to the class as `Ident(classDef.name)`, which
was unhygienic in case of `implicit class X[X]`.
To use symbols without causing a cycle, I switched from
`REF(symbol)` to `Ident(symbol)`. The former calls into:
at scala.reflect.internal.TreeGen.mkAttributedSelect(TreeGen.scala:184)
at scala.reflect.internal.TreeGen.mkAttributedRef(TreeGen.scala:124)
at scala.reflect.internal.TreeGen.mkAttributedRef(TreeGen.scala:130)
at scala.tools.nsc.ast.TreeDSL$CODE$.REF(TreeDSL.scala:307)
which forces the info of enclosing module and forms a cycle.
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SI-5313 Do not eliminate stores that potentially wipe referenes
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I realized I was missing a test case for a local store early in a loop
that was unused but turned out to be a clobber of a store later in the
loop.
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When an unused store clobbers a previous store, replace it with storing
a null. Don't mark clobbers as "used" so that the original clobber and
all following clobbers can still be eliminated.
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Storing to local variables of reference or array type is indirectly
observable because it potentially allows gc to collect an object. So
this commit makes DeadCodeElimination mark a store necessary if it
assigns to a local that potentially stored by a previous necessary store.
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SI-7046 reflection now auto-initializes knownDirectSubclasses
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knownDirectSubclasses joins the happy family of flags, annotations and
privateWithin, which automatically trigger initialization, when used
within runtime reflection.
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Analyzer Plugins
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Before:
scala> class A { class C extends { val x: A = this } with AnyRef }
<console>:7: error: type mismatch;
found : A.this.C
required: A
class A { class C extends { val x: A = this } with AnyRef }
^
Note that the same thing is necessary and already done in Namers (see
def createNamer). The whole logic of when and how to create contexts
should be factored out and reused in Namer and Typer.
(
My Hobby [1]: detecting compiler by just looking at its soruce
[1] http://www.explainxkcd.com/wiki/index.php?title=Category:My_Hobby
)
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AnnotationCheckers are insufficient because they live outside the
compiler cake and it's not possible to pass a Typer into an annotation
checker.
Analyzer plugins hook into important places of the compiler:
- when the namer assigns a type to a symbol (plus a special hook for
accessors)
- before typing a tree, to modify the expected type
- after typing a tree, to modify the type assigned to the tree
Analyzer plugins and annotation checker can be activated only during
selected phases of the compiler.
Refactored the CPS plugin to use an analyzer plugin (since
adaptToAnnotations is now part of analyzer plugins, no longer
annotation checkers).
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- when typing (and naming) a ValDef, tpt and rhs are now type checked
in the same context (the inner / ValDef context). this does not change
any behavior, but is more uniform (same as for DefDef). martin told me
(offline) that this change is desirable if it doesn't break anything.
(it doesn't).
- typeSig is now more uniform with a separate method for each case
(methodSig, valDefSig, etc). methodSig was cleaned up (no more variables)
and documented. the type returned by methodSig no longer contains /
refers to type skolems, but to the actual type parameters (so we don't
need to replace the skolems lateron).
- documentation on constructor contexts, type skolems
- more tests for SI-5543
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Integrates annotationsLub into lub.
Also fixes SubstSymMap when mapping over annotaion trees. I don't
understand what the previous code was supposed to achieve, but it
crashed in some of my examples.
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