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Plugins get a class path
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Let -Xplugin specify a class path (or multiple of them).
Each entry can be a jar or dir, and the first entry to supply
a plugin descriptor defines the plugin to load.
If no plugin is found on the path, then issue a warning if `-Xdev`.
This honors the legacy silent treatment (which scala-ide tests for).
In the proposed scheme, each plugin gets a class loader so that
plugins are isolated from each other.
Presumably, if compiler plugins were a rich ecosystem, in which
shared dependencies were required in incompatible versions, this
would have become a requirement by now.
(Updated with a `DirectTest` that uses two plugins, but keeping
the following as documentation.)
Partest can't do multiple plugins yet, but this is what it looks like:
```
skalac -Xplugin:sample.jar:useful.jar:util,needful.jar:another.jar:util,needful.jar:util:exploded -Xplugin-require:sample,another,other foo.scala
skalac -Xplugin:sample.jar:useful.jar:util,needful.jar:another.jar:util,needful.jar:util:exploded -Xplugin-require:sample,other -Xplugin-disable:another foo.scala
skalac -Xplugin:sample.jar:useful.jar:util,sample.jar:useful.jar:util -Xplugin-require:sample foo.scala
```
The manual test shows three plugins with various permutations of jars and dirs.
The manual test demonstrates that plugins only see classes on their class path:
```
Initializing test.plugins.SamplePlugin
needful.Needful? Failure(java.lang.ClassNotFoundException: needful.Needful)
useful.Useful? Success(class useful.Useful)
Initializing more.plugins.AnotherPlugin
needful.Needful? Success(class needful.Needful)
useful.Useful? Failure(java.lang.ClassNotFoundException: useful.Useful)
Initializing other.plugins.OtherPlugin
```
Disabling a plugin results in a message instead of silent suppression:
```
Disabling plugin another
```
The duplicate plugin class test must still be honored:
```
Ignoring duplicate plugin sample (test.plugins.SamplePlugin)
Initializing test.plugins.SamplePlugin
needful.Needful? Failure(java.lang.ClassNotFoundException: needful.Needful)
useful.Useful? Success(class useful.Useful)
```
If the path is bad, then missing classes will report which plugin induced
the error:
```
Error: class not found: util/Probe required by test.plugins.SamplePlugin
Error: class not found: util/Probe required by more.plugins.AnotherPlugin
Initializing other.plugins.OtherPlugin
needful.Needful? Success(class needful.Needful)
useful.Useful? Failure(java.lang.ClassNotFoundException: useful.Useful)
error: Missing required plugin: sample
error: Missing required plugin: another
two errors found
```
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1. Use (x1, x2): (T1, T2) instead of (x1: T1, x2: T2)
2. More detailed error message for improper function argument
3. Fix typo
4. Completely remove LiftableClass symbol from definitions
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Unliftable is a type class similar to existing Liftable that lets
users to extract custom data types out of trees with the help of
straightforward type ascription syntax:
val q“foo.bar(${baz: Baz})” = ...
This will use Unliftable[Baz] to extract custom data type Baz out of
a tree nested inside of the another tree. A simpler example would be
extracting of constant values:
val q”${x: Int} + ${y: Int}” = q”1 + 2”
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This commit performs a number of preliminary refactoring needed to
implement unliftable:
1. Replace previous inheritance-heavy implementation of Holes with
similar but much simpler one. Holes are now split into two different
categories: ApplyHole and UnapplyHole which correspondingly represent
information about holes in construction and deconstruction quasiquotes.
2. Make Placeholders extract holes rather than their field values. This
is required to be able to get additional mode-specific information
from holes (e.g. only ApplyHoles have types).
3. Bring ApplyReifier & UnapplyReifier even closer to the future where
there is just a single base Reifier with mode parameter.
Along the way a few bugs were fixed:
1. SI-7980 SI-7996 fail with nice error on bottom types splices
2. Use asSeenFrom instead of typeArguments in parseCardinality.
This fixes a crash if T <:< Iterable[Tree] but does not itself
have any type arguments.
3. Fix spurious error message on splicing of Lists through Liftable[List[T]]
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This commit introduces internal attachment that allows unapply macros to
be aware of their sub patterns and tweak their expansion depending
on that info.
At the moment this is not possible due to the way pattern macros are
expanded:
case MacroPat(inner1, inner2) => ...
During type checking this will expand as
MacroPat.unapply(<unapply-dummy>)
Meaning that macro can’t see inner1 and inner2 in it’s macroApplication.
To circumvent this we attach that info as an attachment to the dummy.
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Previously we believed that having Liftable outside of the Universe will
bring some advantages but it turned out this wasn’t worth it. Due to
infectious nature of path dependent types inside of the universe one
had to cast a lot. A nice example of what I’m talking about is a change
in trait ArbitraryTreesAndNames.
Additionally a number of standard Liftables is added for types that are
available through Predef and/or default scala._ import: Array, Vector,
List, Map, Set, Option, Either, TupleN.
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Previously trees that represent parameters, case clauses and
type variables had strictly defined ValDef, TypeDef and CaseDef
types which caused problems in compositionality.
Now this checks are moved to runtime so it's possible to pass
a tree that is CaseDef but has Tree type.
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Previously it also matched other nodes but returned Nil as value of xs.
This behavior was added for sake of consistentcy with q”f[..$ts]”. On
the other hand q”f[..$Nil]” == q”f” but q”f(..$Nil)” == q”f()” not q”f”.
Due to this deconstruction/construction symmetry was broken.
On the other hand applications also have q"f(...$xss)" option which is
infact similar to q"f[..$ts]". Splicing Nil into it also results in q"f".
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streamlines refchecking undesired symbol properties
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Unifies `checkDeprecated`, `checkMigration` and `checkCompileTimeOnly`
into a single centralized point of reference that is now consistently
called from `checkTypeRef`, `transformIdent` and `transformSelect`.
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With the new focus on quasiquotes in macro implementations, we now have
to change the way how inference of macro def return types works.
Previously, if the return type of a macro def wasn’t specified, we looked into
the signature of its macro impl, took its return type (which could only
be c.Expr[T]) and then assigned T to be the return type of the macro def.
We also had a convenient special case which inferred Any in case when
the body of the macro impl wasn’t an expr. That avoided reporting spurious
errors if the macro impl had its body typed incorrectly (because in that
case we would report a def/impl signature mismatch anyway) and also provided
a convenience by letting macro impls end with `???`.
However now we also allow macro impls to return c.Tree, which means that
we are no longer able to do any meaningful type inference, because c.Tree
could correspond to tree of any type.
Unfortunately, when coupled with the type inference special case described
above, this means that the users who migrate from exprs to quasiquotes
are going to face an unpleasant surprise. If they haven’t provided
explicit return types for their macro defs, those types are going to be
silently inferred as `Any`!
This commit plugs this loophole by prohibiting type inference from
non-expr return types of macro impls (not counting Nothing). Moreover,
it also deprecates c.Expr[T] => T inference in order to avoid confusion
when switching between exprs and quasiquotes.
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SI-8013 Nowarn on macro str interpolation
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When warning about stray "foo $bar" under `-Xlint`,
which may be missing an interpolator id, suppress
the warning if we're in the middle of a macro
expansion, since we have no useful heuristic to
apply to the expanded tree.
The test for whether the string is part of an
expanded tree is to check all open macros for
an expanded tree that contains the literal tree
under scrutiny. (This is deemed more paranoid
than looking for a macro application that is an
enclosing position.)
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better error messages for various macro definition errors
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Diminished Tuple Confusion
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Firstly, for `((a, b) => c): (Tuple2[A, B] => C)`, we currently
just offer "missing parameter type." Is something of a rite of
passage to know that you need `{ case (...)}`
This commit stops short DWIM, but does offer a diagnostic to guide
the user towards the supported way of destructuring a `Tuple` in
the sole argument of a `Function1`.
Secondly, another (less common?) way one might try to write a function
to destructure a single tuple argument is:
(((a, b)) => c)
The parser now matches offers a specific error message for this, and
points out the alternatives.
In both cases, we avoid offering syntactically invalid alternatives,
by detecting names that aren't valid as variable-patterns, and
falling back to generic "paramN" in the error message.
A handly utility function to sequence a list of options is liberated
from the pattern matcher for broader use.
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- Make `WildCardType` kind polymorphic
- Factory methods for expected kinds. They are still just
`Type`-s, though.
- Check if the type parameter is initialized, rather than
its owner.
- Take advantage of these to cleanup `typedAppliedTypeTree`
TODO: is this comment totally accurate? If so, should we
refactor `Kind.FromParams(tparams)` to `Kind.Arity(tparams.length)`?
// @M: kind-arity checking is done here and in adapt,
// full kind-checking is in checkKindBounds (in Infer)
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Removing the `isComplete` check altogether leads to cycles in,
for instatnce, F-bound type parameters:
trait LSO[+A, +Repr <: LSO[A, Repr]] // error: illegal cyclic reference involving type Repr
But, I believe that we can (and must) eagerly initialize the type
parameter symbols if we are typechecking a pattern.
While this appeared to regress in 2.11.x, but the problem was in fact
dormant and was merely uncovered in the fix for SI-7756, 3df1d77fc.
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Merge 2.10.x, and PR #3196, to master
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merge/2.10.x-positions-to-master
Conflicts:
src/compiler/scala/tools/nsc/typechecker/Typers.scala
test/files/neg/applydynamic_sip.check
- Changes two calls from `.endOrPoint` to `.point`. The latter
is safe in master for both `Range`- and `OffsetPosition`s
- Updates checkfiles with unrelated position changes (constructors)
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Previously there occurred a NoPosition error when one asks for position
information in the AST because no positions were set to the trees
created during the transformation for updateDynamic calls. This commit
applies range positions to the trees in order to being able to highlight
them inside of the scala-ide.
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Previously, there were no positions created for the tuples that are
generated while doing the transformation for an applyDynamicNamed call.
This led to an NoPosition error in scalac when one tries to show
position information in the AST. Furthermore, this simplifies semantic
highlighting in the scala-ide because no position information for color
ranges have to be created anymore.
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The new positions are range positions that directly refer to the
beginning and the end of the method calls in the sources instead of
simply point to the beginning of the expression. This allows the
scala-ide to semantically highlight select- and applyDynamic method
calls, because it has only to traverse the tree and apply the color
ranges to the given position ranges.
This also fixes the position marker of an error messages related
to a wrong Dynamic method signature.
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Backport of
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Updates localeContext() to return the best context possible when there are none directly
associated with the given position. It happens when an expression cannot be
successfully typed, as no precise ContextTree covers the expression location, or if the
position is not inside any expression.
Adds corresponding tests
(cherry picked from commit 3028327e2a2b553b12ee45519413515c8aa0865f)
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Adds a new marker /*_*/ to trigger scope completion test.
Original type completion test oracles update for the tweaked output
(cherry picked from commit 9c7c66ff7907e3ab814f0f4375eeaf6cdd230d5e)
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The tree created during expansion of default arguments contained trees with the
wrong type of positions. Let's discuss this with an example. Below is the tree
generated for the `foo` method in the test class included in this commit.
Before this commit:
```
[54:94]def foo(): [58]Unit = <70:90>{
[70:79]<artifact> val qual$1: [70]Bar = [70:79][70:79][70:79]new [74:77]Bar();
[80]<artifact> val x$1: [80]Int = [80]qual$1.bar$default$1;
<70:90><70:83>qual$1.bar([80]x$1)
}
```
Now:
```
[54:99]def foo(): [58]Unit = <70:95>{
<70:84><artifact> val qual$1: [70]Bar = [70:84][70:84][70:84]new [74:77]Bar();
[85]<artifact> val x$1: [85]Int = [85]qual$1.bar$default$1;
<70:95>[84:88]qual$1.bar([85]x$1)
}
```
Here are the list of changes:
* The synthetic `qual$1` has a transparent position, instead of a range position.
* The new Select tree (i.e., `qual$1.bar`) should always have a range position,
because `selected` (i.e., the called method) is always visible in the source
(in fact, this is the whole point of the fix, we need a range position or
hyperlinking request from the Scala IDE won't work).
* The Block that contains the expanded default arguments is forced to have a
transparent position, as it never exist in the original source.
The tricky part of the fix is the position assigned to the new Select tree,
which needs to respect the range position's invariants. In the specific case,
we ought to make sure that range positions don't overlap. Therefore, the position
assigned to the new Select tree is computed by intersecting the original Select
position (i.e., `baseFun`'s position) and the original qualifier's position
(i.e., `qual`'s position).
If you take a closer look at the range positions assigned in the tree after this
commit, you'll notice that the range position of the `qual$1`'s rhs (i.e.,
[70:84]), and `qual$1.bar` (i.e., [84:88]) might seem to overlap, because the
former ends where the latter begins. However, this not the case because of the
range position's invariant 2, which states:
> Invariant 2: in a range position, start <= point < end
Hence, the above two positions aren't overlapping as far as the compiler is
concerned.
One additional aspect (that may look like a detail) is that we make sure to
never generate a position such that its start is after its end. This is why we
take the position with the smallest end point.
Furthermore, calling `withStart` would turn any position in a range position,
which isn't desiderable in general (and, even worse, this can lead to
generation of invalid positions - bad offsets - if the computation is performed
on offset positions). Hence, the position's computation is only performed when
both `baseFun` and `qual` positions are range positions. Indeed, I expect this to
be always the case if the compiler is started with -Yrangepos.
(cherry picked from commit 3009a525b58a4c7865ff524899b85518884ee5f7)
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[backport] SI-7776 post-erasure signature clashes are now macro-aware
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"double definition: macro this and method that have same type after erasure"
This error doesn't make sense when macros are involved, because macros
expand at compile-time, where we're not affected by erasure. Moreover,
macros produce no bytecode, which means that we're safe from VerifyErrors.
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Fix completion after application with implicit arguments
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`List(1, 2, 3).map(f).<ctrl-space>` now works; before
the tree had the type `(bf: CanBuildFrom[...]):...` and
did not contribute completions from the result type.
This commit checks if the tree has an implicit method
type, and typechecks it as a qualifier. That is enough
to get to `adaptToImplicitMethod` in the type checker,
infer the implicit arguments, and compute the final result
type accordingly.
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private access for local companions
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We go through similar gymnastics to make companion implicits
work for local class/object pairings, so we ought to be consistent
when it comes to access
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- Dealias pattern types before launching the CheckabilityChecker
- Sharpen the error messages to explain that the dealiased type
is the expansion of the alias.
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SI-7872 Plug a variance exploit in refinement types
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Refinement types are collapsed to a TypeTree with an original
during type checking; this was enough to evade variance validation
in refchecks.
This commit:
- validates the original of `TypeTree`s in refchecks
- changes VarianceValidator to recurse into:
- the originals of `TypeTree`s
- `TypTree` (to cover, e.g. `CompoundTypeTree` / `SelectFromTypeTree`)
It also finds an unreported variance violation in an existing
test case, variances.scala. This looks to be legitimate.
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SI-7967 Account for type aliases in self-type checks
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These eluded the check for "illegal inheritance; self-type does not
conform" as AliasTypeRef doesn't forward `typeOfThis`.
This commit dealiases before calling `typeOfThis`. That seems to be
the most localised change.
Without the dealias, we had:
parent.tpe = TypeRef(pre, sym = AliasTypeSymbol("CC"), Nil)
parent.tpe.typeOfThis = parent.tpe.transform(sym.typeOfThis) = CC
After:
parent.tpe.dealias = TypeRef(pre, sym = ClassSymbol("C"), Nil)
parent.tpe.dealias.typeOfThis = C with B
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Unifying -Ydelambdafy:{inline, method}
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Previously, new synthetic parameter symbols were created for the
apply method parameters, but only used in its `MethodType`. The
`ValDef` trees of the function, along with their symbols, were
used directly as the parameter trees of the apply method.
% cat sandbox/test.scala
object Test {
(x: Int) => {
(y: Int) => ???
}
}
% scalac-hash v2.10.3 -Xprint:typer,uncurry -uniqid ../scala2/sandbox/test.scala | egrep 'syntax|\bx'
[info] v2.10.3 => /Users/jason/usr/scala-v2.10.3-0-g88b5d19
[[syntax trees at end of typer]] // test.scala
((x#12152: Int#351) => x#12152)#12151
[[syntax trees at end of uncurry]] // test.scala
final def apply#15952(x#12152: Int#351): Int#351 = x#12152
This approach dates back a long way: c64152bc3. @odersky tells me it
was most likely due to insufficent substitution/cloning machinery
at the time.
% qbin/scalac -Xprint:typer,uncurry -uniqid ../scala2/sandbox/test.scala | egrep 'syntax|\bx'
[[syntax trees at end of typer]] // test.scala
((x#13685: Int#1760) => x#13685)#13671
[[syntax trees at end of uncurry]] // test.scala
final def apply#13959(x#13960: Int#1760): Int#1760 = x#13960
To make this work, I had to fix a problem in symbol substition; this
was commited in the previous commit. In the enclosed test, at Uncurry,
the symbol of the nested class `N` had a `ClassInfoType`, which listed
as a parent `M[a.C]`. When we substituted the new method parameter
symbol `a` for the eponymous function parameter symbol, this was not
touched.
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- Use tree factories that accept symbols and encapsulate ValDef
creation
- Use `gen.mkForwarder` to handle the conditional addition of
`: _*` for varargs functions. We don't need to predicate this
on `etaExpandKeepsStar`; the only place that need to do that
is EtaExpansion.
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correctly fails implicit search for invalid implicit macros
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There was a rare corner case when implicit search wouldn’t discard
an invalid implicit macro (e.g. the one with mismatching macro impl or
the one with macro impl defined in the same compilation run) during
typechecking the corresponding candidate in typedImplicit1. This is now fixed.
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Fix implicit divergence regression
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While debugging pos/t7983.scala, I noticed that:
complexity(scala.type): 1
complexity(Int): 2
The intent of the code is that top level classes should have
a complexity of one. This commit restores that for cases when
we see the prefix type as a ThisType, rather than a SingleType.
I can't construct a test case in which this small difference
is observable in the divergence checks.
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