| Commit message (Collapse) | Author | Age | Files | Lines |
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We can only do this on 2.12.x, because URLClassLoader#close
is new in JDK 7.
Tested manually with the REPL and resident compilers.
```
% qscalac sandbox/macro.scala && (for i in 1 2; do echo sandbox/client.scala; done; printf '\n') | qscalac -Xresident -Ylog:all -Ydebug 2>&1 | grep "Closing macro runtime classloader"
[log terminal] Closing macro runtime classloader
[log terminal] Closing macro runtime classloader
% qscalac sandbox/macro.scala && (for i in 1 2; do echo Macro.m; done; printf '\n') | qscala -Ylog:all -Ydebug 2>&1 | grep "Closing macro runtime classloader"; stty echo
[log terminal] Closing macro runtime classloader
[log terminal] Closing macro runtime classloader
```
Note: this doesn't close handles to JAR files held by the
compiler classpath implementation, that will require changes
elsewhere.
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The original code came from 2008, (a4ace382), at which point
we probably couldn't use JDK 1.5+ methods.
I haven't changed `unsignedCompare` yet to use the standard
library version, as it our version might have different
performance characteristics.
Background: http://www.drmaciver.com/2008/08/unsigned-comparison-in-javascala/
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... in parallel collection operations.
Followup to bcbe38d18, which did away with the the approach to
use a composite exception when more than one error happened.
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The API for doing so efficiently was made regular in Java 1.8.
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By using newly introduced static methods in the Java standard
library.
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Fix typo in the docs for the ++ method of Stream
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Add initial unit test for Catch and augment documentation
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- Add unit test for andFinally
- Reduce code duplication in andFinally
- Extend documentation
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SI-9702 Fix backend crash with classOf[T] annotation argument
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This commit fixes various issues with classOf literals and Java
annotations.
- Ensure that a Type within a ConstantType (i.e., a classOf literal)
is erased, so `classOf[List[Int]]` becomes `classOf[List]`.
- Ensure that no non-erased types are passed to `typeToBType` in the
backend. This happens for Java annotations: the annotation type and
`classOf` annotation arguments are not erased, the annotationInfos
of a symbol are not touched in the compiler pipeline.
- If T is an alias to a value class, ensure that `classOf[T]` erases
to the value class by calling `dealiasWiden` in erasure.
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Unify treatment of built-in functions and SAMs
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Jason points out the recursion will be okay if
type checking the function inside the eta-expansion provides
fully determined argument types, as the result type is
not relevant for this phase of typedFunction.
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When recovering missing argument types for an
eta-expanded method value, rework the expected type
to a method type.
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The body of `def delay[T](v: => T) = (v _): F0[T]`
becomes `() => v` during `typedEta`, and then uncurry
considers whether to strip the function wrapper since
`v` is known to be a `Function0` thunk. Stripping is sound
when the expected type is `Function0` for this expression,
but that's no longer a given, since we could be expecting any
nullary SAM.
Also sweep up a bit around `typedEta`.
Encapsulate the, erm, creative encoding of
`m _` as `Typed(m, Function(Nil, EmptyTree))`.
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Jason points out we still need it for bytecode efficiency,
due to mixin forwarders.
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Rather than in implementation of the abstract method in the
expanded anonymous class.
This leads to more more efficient use of the constant pool,
code shapes more amenable to SAM inlining, and is compatible
with the old behaviour of `-Xexperimental` in Scala 2.11,
which ScalaJS now relies upon.
Manual test:
```
scala> :paste -raw
// Entering paste mode (ctrl-D to finish)
package p1; trait T { val x = 0; def apply(): Any }; class DelambdafyInline { def t: T = (() => "") }
// Exiting paste mode, now interpreting.
scala> :javap -c p1.DelambdafyInline
Compiled from "<pastie>"
public class p1.DelambdafyInline {
public p1.T t();
Code:
0: new #10 // class p1/DelambdafyInline$$anonfun$t$1
3: dup
4: aload_0
5: invokespecial #16 // Method p1/DelambdafyInline$$anonfun$t$1."<init>":(Lp1/DelambdafyInline;)V
8: areturn
public final java.lang.Object p1$DelambdafyInline$$$anonfun$1();
Code:
0: ldc #22 // String
2: areturn
public p1.DelambdafyInline();
Code:
0: aload_0
1: invokespecial #25 // Method java/lang/Object."<init>":()V
4: return
}
scala> :javap -c p1.DelambdafyInline$$anonfun$t$1
Compiled from "<pastie>"
public final class p1.DelambdafyInline$$anonfun$t$1 implements p1.T,scala.Serializable {
public static final long serialVersionUID;
public int x();
Code:
0: aload_0
1: getfield #25 // Field x:I
4: ireturn
public void p1$T$_setter_$x_$eq(int);
Code:
0: aload_0
1: iload_1
2: putfield #25 // Field x:I
5: return
public final java.lang.Object apply();
Code:
0: aload_0
1: getfield #34 // Field $outer:Lp1/DelambdafyInline;
4: invokevirtual #37 // Method p1/DelambdafyInline.p1$DelambdafyInline$$$anonfun$1:()Ljava/lang/Object;
7: areturn
public p1.DelambdafyInline$$anonfun$t$1(p1.DelambdafyInline);
Code:
0: aload_1
1: ifnonnull 6
4: aconst_null
5: athrow
6: aload_0
7: aload_1
8: putfield #34 // Field $outer:Lp1/DelambdafyInline;
11: aload_0
12: invokespecial #42 // Method java/lang/Object."<init>":()V
15: aload_0
16: invokespecial #45 // Method p1/T.$init$:()V
19: return
}
scala> :quit
```
Adriaan is to `git blame` for `reflection-mem-typecheck.scala`.
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Also, drop AbstractFunction for parent of anonymous subclass of
function type that must have its class spun up at compile time
(rather than at linkage time by LambdaMetaFactory).
This revealed an old problem with typedTemplate, in which
parent types may be normalized at the level of trees,
while this change does not get propagated to the class's info
in time for the constructor to be located when we type check
the primary constructor.
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Thus, rule out traits that have a constructor (which we use
as a proxy for having potentially side-effecting statements),
and create an anonymous subclass for them at compile time.
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LambdaMetaFactory can only properly instantiate Java interfaces
(with one abstract method, of course). A trait always compiles
to an interface, but a subclass that can be instantiated may
require mixing in further members, which LMF cannot do.
(Nested traits, traits with fields,... do not qualify.)
Traits that cannot be instantiated by LMF are still SAM targets,
we simply created anonymous subclasses as before.
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When a SAM type is specialized (i.e., a specialized type
parameter receives a specialized type argument), do not use
LambdaMetaFactory (expand during Uncurry instead).
This is an implementation restriction -- the current
specialization scheme is not amenable to using
LambdaMetaFactory to spin up subclasses. Since the generic
method is abstract, and the specialized ones are concrete,
specialization is rendered moot because we cannot implement
the specialized method with the lambda using LMF.
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We compile FunctionN to Java 8's idea of a function now,
so no need to target the artisanal JFunction and friends,
except when the function is specialized, as I don't yet
see how we can use LMF with the way specialization handles
FunctionN:
First, the working status quo -- the hand-crafted specialized
versions of JFunction0. Notice how `apply$mcB$sp` is looking
pretty SAMmy:
```
@FunctionalInterface
public interface JFunction0$mcB$sp extends JFunction0 {
@Override
public byte apply$mcB$sp();
@Override
default public Object apply() {
return BoxesRunTime.boxToByte(this.apply$mcB$sp());
}
}
```
Contrast this with our specialized standard FunctionN:
```
public interface Function0<R> {
public R apply();
default public byte apply$mcB$sp() {
return BoxesRunTime.unboxToByte(this.apply());
}
}
public interface Function0$mcB$sp extends Function0<Object> { }
```
The single abstract method in `Function0$mcB$sp` is `apply`, and
the method that would let us avoid boxing, if it were abstract,
is `apply$mcB$sp`...
TODO (after M4):
- do same for specialized functions (issues with boxing?)
- remove scala/runtime/java8/JFunction* (need new STARR?)
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For completeness, `-Xsource:2.11 -Xexperimental` does enable it.
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Trying to figure out if we can avoid adapting to SAM, and just
type them once and for all in typedFunction. Looks like overload
resolution requires SAM adaptation to happen in adapt.
Cleaned up while I was in the area.
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This reflects the majority vote on the PR.
DSLs that need their implicit conversions to kick in instead of
SAM conversion, will have to make their target types not be SAM
types (e.g., by adding a second abstract method to them).
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Some of the earlier proposals were too strongly linked to the
requirements of the Java 8 platform, which was problematic for
scala.js & friends.
Instead of ruling out SAM types that we can't compile to use
LambdaMetaFactory, expand those during compilation to anonymous
subclasses, instead of invokedynamic + LMF.
Also, self types rear their ugly heads again. Align `hasSelfType`
with the implementation suggested in `thisSym`'s docs.
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We cannot use the expected type to track whether a Function node
targets a SAM type, as the expected type may be erased (see test
for an example).
Thus, the type checker attaches a SAMFunction attachment to a
Function node when SAM conversion is performed in adapt. Ideally,
we'd move to Dotty's Closure AST, but that will need a
deprecation cycle.
Thanks to Jason for catching my mistake, suggesting the fix and
providing the test.
Both the sam method symbol and sam target type must be tracked,
as their relationship can be complicated (due to inheritance).
For example, the sam method could be defined in a superclass (T)
of the Function's target type (U).
```
trait T { def foo(a: Any): Any }
trait U extends T { def apply = ??? }
(((x: Any) => x) : U).foo("")
```
This removes some of the duplication in deriving the sam method
from the expected type, but some grossness (see TODO) remains.
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Do not report second error. Go straight to the exit.
Based on review by Jason.
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- Re-simplify logging;
- Remove unused method valueTypeToObject;
- Limit ThisReferringMethodTraverser to material parts
of the AST
Limit ThisReferringMethodTraverser's analysis to only look at
template-owned anonfun method bodies, to make sure it's fairly
low overhead.
AFAICT, part of the complexity of this analysis stems from the
desire to make all the lambda impl methods static in
`() => () => 42`: https://gist.github.com/062181846c13e65490cc.
It would possible to accumulate the knowledge we need during the
main transform, rather than in an additional pass. We'd need to
transform template bodies in such a way that we we process
definitions of anonfun methods before usages, which would
currently amount to transforming the stats in reverse.
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Sometimes booleans and a little duplication go a long way.
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Test that SAM conversion happens after implicit view application
A function node is first type checked, and parameter types are
inferred, regardless of whether the expected function type is one
of our built-in FunctionN classes, or a user-defined Single
Abstract Method type.
`typedFunction` always assigns a built-in `FunctionN` type to the
tree, though.
Next, if the expected type is a (polymorphic) SAM type, this
creates a tension between the tree's type and the expect type.
This gap is closed by the adapt method, by applying one of the
implicit conversion in the spec in order (e.g., numeric widening,
implicit view application, and now, also SAM conversion)
Thus, `adaptToSam` will assign the expected SAM type to the
`Function` tree. (This may require some type inference.) The
back-end will emit the right invokedynamic instruction that uses
Java's LambdaMetaFactory to spin up a class that implements the
target method (whether it's defined in FunctionN or some other
Java functional interface).
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Also test roundtripping serialization of a lambda that targets a
SAM that's not FunctionN (it should make no difference).
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Crucially, the fully-defined expected type must be checked for
conformance to the original expected type!!
The logic in adaptToSam that checks whether pt is fully defined
probably needs some more thought. See pos/t8310 for a good test
case. Argument type checking is a challenge, as we first check
against a lenient pt (this lenient expected type has wildcards,
and thus is not fully defined, but we should still consider sam
adaptation a success even if we end up with wildcards for some
unknown type parameters, they should be determined later).
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They both compile to INDY/MetaLambdaFactory, except when they
occur in a constructor call. (TODO: can we lift the ctor arg
expression to a method and avoid statically synthesizing
anonymous subclass altogether?)
Typers:
- no longer synthesize SAMs -- *adapt* a Function literal
to the expected (SAM/FunctionN) type
- Deal with polymorphic/existential sams (relevant tests:
pos/t8310, pos/t5099.scala, pos/t4869.scala) We know where
to find the result type, as all Function nodes have a
FunctionN-shaped type during erasure. (Including function
literals targeting a SAM type -- the sam type is tracked as
the *expected* type.)
Lift restriction on sam types being class types. It's enough
that they dealias to one, like regular instance creation
expressions.
Contexts:
- No longer need encl method hack for return in sam.
Erasure:
- erasure preserves SAM type for function nodes
- Normalize sam to erased function type during erasure,
otherwise we may box the function body from `$anonfun(args)`
to `{$anonfun(args); ()}` because the expected type for the
body is now `Object`, and thus `Unit` does not conform.
Delambdafy:
- must set static flag before calling createBoxingBridgeMethod
- Refactored `createBoxingBridgeMethod` to wrap my head around
boxing, reworked it to generalize from FunctionN's boxing
needs to arbitrary LMF targets.
Other refactorings: ThisReferringMethodsTraverser, TreeGen.
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Go beyond refactoring and introduce some hooks and patch some
holes that will become acute when we set Sammy loose.
Expanding sam requires class as first parent: `addObjectParent`.
(Tested in pos/sam_ctor_arg.scala, coming next.)
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`typedFunction` uniformly recognizes Single Abstract Method types
and built-in `FunctionN` types, type checking literals regardless
of expected type.
`adapt` synthesizes an anonymous subclass of the SAM type, if
needed to meet the expected (non-`FunctionN`) type.
(Later, we may want to carry `Function` AST nodes with SAM types
through the whole pipeline until the back-end, and treat them
uniformly with built-in function types there too, emitting the
corresponding `invokedynamic` & `LambdaMetaFactory` bytecode.
Would be faster to avoid synthesizing all this code during type
checking...)
Refactor `typedFunction` for performance and clarity to avoid
non-local returns. A nice perk is that the error message for missing
argument types now indicates with `<error>` where they are missing
(see updated check file).
Allow pattern matching function literals when SAM type is expected
(SI-8429).
Support `return` in function body of SAM target type, by making the
synthetic `sam$body` method transparent to the `enclMethod` chain, so
that the `return` is interpreted in its original context.
A cleaner approach to inferring unknown type params of the SAM
method. Now that `synthesizeSAMFunction` operates on typed `Function`
nodes, we can take the types of the parameters and the body and
compare them against the function type that corresponds to the SAM
method's signature. Since we are reusing the typed body, we do need
to change owners for the symbols, and substitute the new method
argument symbols for the function's vparam syms.
Impl Notes:
- The shift from typing as a regular Function for SAM types was
triggered by limitation of the old approach, which deferred type
checking the body until it was in the synthetic SAM type
subclass, which would break if the expression was subsequently
retypechecked for implicit search. Other problems related to SAM
expansion in ctor args also are dodged now.
- Using `<:<`, not `=:=`, in comparing `pt`, as `=:=` causes
`NoInstance` exceptions when `WildcardType`s are encountered.
- Can't use method type subtyping: method arguments are in
invariant pos.
- Can't use STATIC yet, results in illegal bytecode. It would be a
better encoding, since the function body should not see members
of SAM class.
- This is all battle tested by running `synthesizeSAMFunction` on
all `Function` nodes while bootstrapping, including those where a
regular function type is expected. The only thing that didn't
work was regarding Function0 and the CBN transform, which breaks
outer path creation in lambdalift.
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Initial work to change settings and test by Svyatoslav Ilinskiy
Thanks!
To avoid cycles during overload resolution (which showed up
during bootstrapping), and to improve performance, I've guarded
the detection of SAM types in `isCompatible` to cases when the
LHS is potentially compatible.
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- Upgrade MathJax to 2.6. This fixes the vertical bar problem
on Chrome (https://github.com/mathjax/MathJax/issues/1300);
- Disambiguate link to Dynamic Selection;
- Consolidate type relations;
- Formatting, whitespace and linebreaks;
- SAM conversion.
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For each history entry, run the `Type`'s `toString` at the corresponding
phase, so that e.g., a method type's parameter symbols' `info`'s `toString`
runs at the phase corresponding to the type history we're turning into a
string.
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