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SI-9913 Lead span iterator finishes at state -1
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Even if no elements fail the predicate (so that the trailing
iterator is empty).
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SI-9750 scala.util.Properties.isJavaAtLeast works with JDK9
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Don't assume spec is just major, but allow arbitrary version
number for both spec value and user value to check.
Only the first three dot-separated fields are considered,
after skipping optional leading value "1" in legacy format.
Minimal validity checks of user arg are applied. Leading three
fields, if present, must be number values, but subsequent
fields are ignored.
Note that a version number is not a version string, which
optionally includes pre and build info, `9-ea+109`.
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A good opportunity to simplify the API. Versions are strings,
but a spec version is just a number.
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Leaves the error string as is, but adds test to show how it looks.
Java calls it a version number. `Not a version: 1.9`.
Don't strip `1.` prefix recursively. (That was Snytt's fault.)
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The utility method compares javaSpecVersion, which has the
form "1.8" previously and "9" going forward.
The method accepts "1.n" for n < 9. More correctly, the string
argument should be a single number.
Supports JEP-223.
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just in time for Halloween. "boostrap" is definitely the most
adorable typo evah -- and one of the most common, too. but we don't
want to scare anybody.
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Rewrite TraversableLike.stringPrefix not to blow up code size in Scala.js.
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The commit 30876fe2dd8cbe657a6cad6b11bbc34f10c29b36 changed
`TraversableLike.stringPrefix` to report nicer results for inner
classes and method-local classes. The changes included calls to
`String.split()`, `Character.isDigit()` and `Character.isUpperCase()`.
This was particularly bad for Scala.js, because those methods
bring with them huge parts of the JDK (the `java.util.regex.*`
implementation on the one hand, and the Unicode database on the
other hand), which increased generated code size by 6 KB after
minimification and gzip for an application that does not otherwise
use those methods. This sudden increase is tracked in the Scala.js
bug tracker at https://github.com/scala-js/scala-js/issues/2591.
This commit rewrites `TraversableLike.stringPrefix` in a very
imperative way, without resorting to those methods. The behavior
is (mostly) preserved. There can be different results when
`getClass().getName()` contains non-ASCII lowercase letters and/or
digits. Those will now be recognized as user-defined instead of
likely compiler-synthesized (which is a progression). There still
are false positives for ASCII lowercase letters, which cause the
`stringPrefix` to be empty (as before).
Since the new implementation is imperative anyway, at least I made
it not allocate anything but the result `String` in the common
case where the result does not contain any `.`.
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Include PRs #5464, #5467
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Fix conflict in #5453:
```
- def help: String = {
+ override def help: String = {
```
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Conclude help method with the default list.
Extra words are supplied for underscore.
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The boolean test for triples was inadvertently flipped.
Adds test for pretty printed multiline strings
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Cherry-picked c5f3d3f286ee5c26c8ddcf10f6878058e8f7e040
Edited comment: in stringOf, let GenIterable subsume
both Iterable and ParIterable.
This change is required for Scala.js compatibility as it does not
support parallel collections.
Conflicts:
src/library/scala/runtime/ScalaRunTime.scala
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SI 9766 - allow ++ on empty ConcatIterator
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Recovered and adapted some test cases for super calls from #5415
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Also eliminates the warning when a mixin forwarder cannot be implemented
because the target method is a java-defined default method in an
interface that is not a direct parent of the class.
The test t5148 is moved to neg, as expected: It was moved to pos when
disabling mixin forwarders in 33e7106. Same for the changed error
message in t4749.
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Super calls to indirect java parent interfaces cannot be emitted, an
error message is emitted during SuperAccessors.
The error message was missing if the super call was non-qualified,
resulting in an assertion failure in the backend.
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merge 2.12.0 onto 2.12.x [ci: last-only]
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The motivation is to use the new fine-grained lock scoping that
local lazies have since #5294.
Fixes scala/scala-dev#235
Co-Authored-By: Jason Zaugg <jzaugg@gmail.com>
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GenBCode, the new backend in Scala 2.12, subtly changed
the way that synchronized blocks are emitted.
It used `java/lang/Throwable` as an explicitly named exception
type, rather than implying the same by omitting this in bytecode.
This appears to confuse HotSpot JIT, which reports a error
parsing the bytecode into its IR which leaves the enclosing method
stuck in interpreted mode.
This commit passes a `null` descriptor to restore the old pattern
(the same one used by javac.) I've checked that the JIT warnings
are gone and that the method can be compiled again.
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The monitors and module instantation were inliuned into the module accessor
method in b2e0911. However, this seems to have had a detrimental impact on
performance. This might be because the module accessors are now above the
"always inline" HotSpot threshold of 35 bytes, or perhaps because they
contain monitor-entry/exit and exception handlers.
This commit returns to the the 2.11.8 appraoch of factoring
the the second check of the doublecheck locking into a method.
I've done this by declaring a nested method within the accessor;
this will be lifted out to the class level by lambdalift.
This represents a slight deviation from the implementation strategy used
for lazy accessors, which create a symbol for the slowpath method in
the info transform and generate the corresponding DefDef as a class
member. I don't believe this deviation is particular worrisome, though.
I have bootstrapped the compiler through this commit and found that
the drastic regression in compiling the shapeless test suite is solved.
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This follows the Scaladoc, and makes
```
"abcdef".indexOf('c', -1)
```
work like
```
"abcdef".toVector.indexOf('c', -1)
```
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The restriction for super calls to methods defined in indirect super
classes introduced in a980fde was over-restrictive. In particular, it
ruled out a valid code pattern to select a method from a superclass
when an unqualified `super` would resolve to an override defined in a
trait (example in the commit as a test).
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Fixes to mixin forwarders
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If a call super[T].m resolves to a method A.m where A is a class, but
not the direct superclass of the current class, there is no way to
emit an invocation of A.m: `invokespecial A.m` will resolve to B.m
where B is the superclass of the current class.
This commit adds an error message in this case.
Note that this is similar to an existing error message for qualified
super calls to a non-direct superclass:
class A { def m = 1 }
class B extends A { override def m = 2 }
class C extends B { override def m = super[A].m }
Gives "error: A does not name a parent class of class C".
If the user means to call method m in the superclass, he can write an
unqualified `super.m`.
An similar error message is introduced if A is a Java-defined interface
(and m is a default method), and A is not a direct parent of the current
class. In this case `invokespecial A.m` is invalid bytecode. The
solution is to add A as a direct parent of the current class.
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With -Xgen-mixin-forwarders the compiler eagerly creates mixin
forwarders for methods inherited from traits, even if the JVM method
resolution would pick the correct default method.
When generating a such a forwarder for a Java-defined default method,
the mixin forwarder invokes the default method directly using
`invokespecial` (for Scala-defined trait methods, the forwarder uses
the static `m$` method that is generated for every trait method).
An `invokespecial` call is only legal if the named interface is a
direct parent of the current class. If this is not the case, we don't
generate the mixin forwarder and emit a warning.
In the tests there's also an example where a mixin forwarder is
required for correctness, but cannot be added because the corresponding
`invokespecial` call would be invalid. In this case we emit an error.
This is similar to what we already do for other super calls to Java-
defined default methods. The difference is that the super call is not
written by the user but generated by the mixin forwarder. The solution
is the same: add the interface as a direct parent.
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Fields: expand lazy vals during fields, like modules
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Essentially, we fuse mixin and lazyvals into the fields phase.
With fields mixing in trait members into subclasses, we
have all info needed to compute bitmaps, and thus we can
synthesize the synchronisation logic as well.
By doing this before erasure we get better signatures,
and before specialized means specialized lazy vals work now.
Mixins is now almost reduced to its essence: implementing
super accessors and forwarders. It still synthesizes
accessors for param accessors and early init trait vals.
Concretely, trait lazy vals are mixed into subclasses
with the needed synchronization logic in place, as do
lazy vals in classes and methods. Similarly, modules
are initialized using double checked locking.
Since the code to initialize a module is short,
we do not emit compute methods for modules (anymore).
For simplicity, local lazy vals do not get a compute method either.
The strange corner case of constant-typed final lazy vals
is resolved in favor of laziness, by no longer assigning
a constant type to a lazy val (see widenIfNecessary in namers).
If you explicitly ask for something lazy, you get laziness;
with the constant-typedness implicit, it yields to the
conflicting `lazy` modifier because it is explicit.
Co-Authored-By: Lukas Rytz <lukas@lightbend.com>
Fixes scala/scala-dev#133
Inspired by dotc, desugar a local `lazy val x = rhs` into
```
val x$lzy = new scala.runtime.LazyInt()
def x(): Int = {
x$lzy.synchronized {
if (!x$lzy.initialized) {
x$lzy.initialized = true
x$lzy.value = rhs
}
x$lzy.value
}
}
```
Note that the 2.11 decoding (into a local variable and a bitmap) also
creates boxes for local lazy vals, in fact two for each lazy val:
```
def f = {
lazy val x = 0
x
}
```
desugars to
```
public int f() {
IntRef x$lzy = IntRef.zero();
VolatileByteRef bitmap$0 = VolatileByteRef.create((byte)0);
return this.x$1(x$lzy, bitmap$0);
}
private final int x$lzycompute$1(IntRef x$lzy$1, VolatileByteRef bitmap$0$1) {
C c = this;
synchronized (c) {
if ((byte)(bitmap$0$1.elem & 1) == 0) {
x$lzy$1.elem = 0;
bitmap$0$1.elem = (byte)(bitmap$0$1.elem | 1);
}
return x$lzy$1.elem;
}
}
private final int x$1(IntRef x$lzy$1, VolatileByteRef bitmap$0$1) {
return (byte)(bitmap$0$1.elem & 1) == 0 ?
this.x$lzycompute$1(x$lzy$1, bitmap$0$1) : x$lzy$1.elem;
}
```
An additional problem with the above encoding is that the `lzycompute`
method synchronizes on `this`. In connection with the new lambda
encoding that no longer generates anonymous classes, captured lazy vals
no longer synchronize on the lambda object.
The new encoding solves this problem (scala/scala-dev#133)
by synchronizing on the lazy holder.
Currently, we don't exploit the fact that the initialized field
is `@volatile`, because it's not clear the performance is needed
for local lazy vals (as they are not contended, and as soon as
the VM warms up, biased locking should deal with that)
Note, be very very careful when moving to double-checked locking,
as this needs a different variation than the one we use for
class-member lazy vals. A read of a volatile field of a class
does not necessarily impart any knowledge about a "subsequent" read
of another non-volatile field of the same object. A pair of
volatile reads and write can be used to implement a lock, but it's
not clear if the complexity is worth an unproven performance gain.
(Once the performance gain is proven, let's change the encoding.)
- don't explicitly init bitmap in bytecode
- must apply method to () explicitly after uncurry
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They remain ValDefs until then.
- remove lazy accessor logic
now that we have a single ValDef for lazy vals,
with the underlying machinery being hidden until the fields phase
leave a `@deprecated def lazyAccessor` for scala-refactoring
- don't skolemize in purely synthetic getters,
but *do* skolemize in lazy accessor during typers
Lazy accessors have arbitrary user code, so have to skolemize.
We exempt the purely synthetic accessors (`isSyntheticAccessor`)
for strict vals, and lazy accessors emitted by the fields phase
to avoid spurious type mismatches due to issues with existentials
(That bug is tracked as https://github.com/scala/scala-dev/issues/165)
When we're past typer, lazy accessors are synthetic,
but before they are user-defined to make this hack less hacky,
we could rework our flag usage to allow for
requiring both the ACCESSOR and the SYNTHETIC bits
to identify synthetic accessors and trigger the exemption.
see also https://github.com/scala/scala-dev/issues/165
ok 7 - pos/existentials-harmful.scala
ok 8 - pos/t2435.scala
ok 9 - pos/existentials.scala
previous attempt: skolemize type of val inside the private[this] val
because its type is only observed from inside the
accessor methods (inside the method scope its existentials are skolemized)
- bean accessors have regular method types, not nullary method types
- must re-infer type for param accessor
some weirdness with scoping of param accessor vals and defs?
- tailcalls detect lazy vals, which are defdefs after fields
- can inline constant lazy val from trait
- don't mix in fields etc for an overridden lazy val
- need try-lift in lazy vals: the assign is not seen in uncurry
because fields does the transform (see run/t2333.scala)
- ensure field members end up final in bytecode
- implicit class companion method: annot filter in completer
- update check: previous error message was tangled up with unrelated
field definitions (`var s` and `val s_scope`),
now it behaves consistently whether those are val/vars or defs
- analyzer plugin check update seems benign, but no way to know...
- error message gen: there is no underlying symbol for a deferred var
look for missing getter/setter instead
- avoid retypechecking valdefs while duplicating for specialize
see pos/spec-private
- Scaladoc uniformly looks to field/accessor symbol
- test updates to innerClassAttribute by Lukas
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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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Usually, `contains` should not look into class symbol infos.
For instance, we expect that:
```
scala> trait C { def foo: Int }; typeOf[C].contains(IntClass)
defined trait C
res1: Boolean = false
```
We do, however, look at the decls of a `RefinedType` in contains:
```
scala> typeOf[{ def foo: Int }].contains(IntClass)
res2: Boolean = true
```
Things get a little vague, however, when we consider a type ref
to the refinement class symbol of a refined type.
```
scala> TypeRef(NoPrefix, typeOf[{ def foo: Int }].typeSymbol, Nil)
res3: $r.intp.global.Type = AnyRef{def foo: Int}
scala> .contains(IntClass)
res4: Boolean = false
```
These show up in the first element of the base type seq of a refined
type, e.g:
```
scala> typeOf[{ def foo: Int }].typeSymbol.tpe_*
res5: $r.intp.global.Type = AnyRef{def foo: Int}
scala> typeOf[{ def foo: Int }].baseTypeSeq(0).getClass
res7: Class[_ <: $r.intp.global.Type] = class scala.reflect.internal.Types$RefinementTypeRef
scala> typeOf[{ def foo: Int }].typeSymbol.tpe_*.getClass
res6: Class[_ <: $r.intp.global.Type] = class scala.reflect.internal.Types$RefinementTypeRef
```
This commit takes the opinion that a `RefinementTypeRef` should be
transparent with respect to `contains`. This paves the way for fixing
the base type sequences of existential types over refinement types.
The implementation of `ContainsCollector` was already calling
`normalize`, which goes from `RefinementTypeRef` to `RefinedType`.
This commit maps over the result, which looks in the parents and
decls.
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SD-192 Change scheme for trait super accessors
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Rather than putting the code of a trait method body into a static method,
leave it in the default method. The static method (needed as the target
of the super calls) now uses `invokespecial` to exactly call that method.
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SD-182 compiler option -Xgen-mixin-forwarders
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Introduce a compiler option -Xgen-mixin-forwarders to always generate
mixin forwarder methods.
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SD-20 Inlcude static methods in the InlineInfo in mixed compilation
Fixes scala/scala-dev#20
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In mixed compilation, the InlineInfo for a Java-defined class is created
using the class symbol (vs in separate compilation, where the info is
created by looking at the classfile and its methods). The scala compiler
puts static java methods into the companion symbol, and we forgot to
include them in the list of methods in the InlineInfo.
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SD-193 Lock down lambda deserialization
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