| Commit message (Collapse) | Author | Age | Files | Lines |
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The STARR ("stable reference") compiler is used to bootstrap the compiler.
It is now always resolved from maven, based on the `starr.version`
property (stored in `versions.properties`).
Before, we used the `.desired.sha1` mechanism to pull a set of jars
that define the compiler used to build locker ("local reference"),
which then builds quick.
From now on, we only support officially released versions of STARR.
Milestones are allowed of course, which means that, instead of
breaking change, STARR evolution must support old and new behavior
for at least one milestone cycle.
For local development, use the `replacestarr` target as before.
It builds quick (core only) and publishes it to your local maven repo
with a generated version number, which is saved as `starr.version`
in `build.properties` for convenience (overriding `versions.properties`),
so that your next build will use this version of the compiler for STARR.
You may now think of STARR as STAble Reference Release -- if you will.
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Replaced starr jars with 2.11.0-M4, built with Scala 2.11.0-M3.
I used `ant replacestarr-opt -Dstarr.use.released=1`, with `starr.number`:
```
starr.version=2.11.0-M3
```
Then pushed the jars to artifactory after moving `lib/jline.jar` out of the way,
as it's no longer "desired" (i.e., not pulled from artifactory). Its presence
seemed to break `./push-binary-libs.sh $ARTIFACTORY_USER $ARTIFACTORY_PASS`.
You can by-pass the custom starr artifact download and use a (released) version
of Scala by changing your `build.properties` to include
```
starr.use.released=1
```
You may optionally change `starr.version` in `starr.number` to whichever version
that maven can resolve for you.
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Seven weeks is a good amount of time between starrs,
and I'm going nutso for -Xdev during locker.
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Contains the extension method naming change, in the
interests of unbreaking the sbt build for a while.
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Reification (both tree-based and type-based) should be avoided
before we release 2.10.0-final, since it impairs reflection refactorings
like the upcoming one.
Also the upcoming refactoring moves tag materialization anchors, and we
have to add them to fast track in advance, so that they are treated as
macros later.
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Deployed a new starr that does not depend on `@static` annotation.
The next step will be deleting `@static` from the library
altogether.
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Updates the starr with the changes introduced by the previous commit.
Cleans up obsolete symbols required by the previous starr.
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for those who use locker as their main development platform
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reify has just been moved to base.Universe from api.Universe, so the fast track
in the old starr doesn't know about its existence. Therefore locker is built
without reify having the MACRO flag, thus it won't be able to expand reify.
Strictly speaking we don't need a new starr, because reify isn't used in scalac
so, even though locker won't recognize reify, quick will be fine.
However you don't know where a little sloppiness is going to bite you,
so I took time to rebuild and push the new starr.
It was as simple as "ant build starr.done" of the parent commit.
No file mingling was required.
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Builds a starr that uses stuff from scala.reflect.macros for macro activities.
Crucial makro thingies (such as makro.Context or makro.internal.macroImpl)
are temporarily left in place, because they are necessary for previous starr.
Macro tests will be fixed in a dedicated commit, so that they don't pollute
meaningful commits, making the life easy for reviewers and spelunkers.
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In our codebase we have a bunch of macros, and some of those macros
(namely, tag materialization macros and string context "f" formatter)
are used inside the compiler itself.
The logic of those macros is hardwired into starr's fast track,
so it doesn't rely on any of the subsystems of the macro engine
to be located, bound and executed.
But to trigger this logic we need to color these macros as macros, i.e. as
term symbols having the MACRO flag. Currently this works automatically,
because fast track macros (the same as regular macros) have their rhs
in the "macro ???" form. Having seen the "macro" keyword, the compiler knows
that the corresponding def declares a macro and sets the MACRO flag.
As the latest refactoring attempt has shown, the "macro" in "macro ???"
is unnecessary and might stand in the way of macro refactorings. After all
if some symbol is in the fast track registry, then it's definitely a macro.
Hence I'm changing the compiler to not need the "macro" keyword in declarations
of fast track macros anymore.
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That doesn't require Context.reify anymore.
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Requires a new starr.
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This commit provides the new sha1 codes of the new STARR.
Moreover, it replaces the implementation of StringContext.f
to `macro ???`. The implementation is magically hardwired into
`scala.tools.reflect.MacroImplementations.macro_StringInterpolation_f`
by the new STARR.
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TypeTag.String is removed because it's unclear whether it should point to
scala.Predef.String or to java.lang.String. ClassTag.String is removed to
be consistent with TypeTag.String.
This requires re-bootstrapping, because Definitions.scala in locker
expects classTag[String] being automatically generated, whereas starr
disagrees with locker on how to generate that class tag.
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1) type ClassManifest[T] = ClassTag[T] (solves a problem
with toArray[T: ClassManifest] defined on most of the collections;
if these types weren't aliases, then we won't be able to change
the signature of that method to toArray[T: ClassTag], because
that would break source compatibility for those who override
toArray in their custom collections)
2) Compiler-generated manifests no longer trigger deprecation warnings
(this is implemented by using ClassManifestFactory instead of ClassManifest
and ManifestFactory instead of Manifest)
3) Deprecation messages got improved to reflect the changes
that were introduced in 2.10.0-M4.
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More details here:
http://groups.google.com/group/scala-internals/browse_thread/thread/fbd6d9f923f1cc89
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Review by @dragos, @jsuereth. Required bootstrapping because the starr was
ant tasks were invoking locker with -Ysourcepath instead of -sourcepath.
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This protects everyone from the confusion caused by stuff like this:
https://issues.scala-lang.org/browse/SI-5884
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Before 2.10 we had a notion of ClassManifest that could be used to retain
erasures of abstract types (type parameters, abstract type members) for
being used at runtime.
With the advent of ClassManifest (and its subtype Manifest)
it became possible to write:
def mkGenericArray[T: Manifest] = Array[T]()
When compiling array instantiation, scalac would use a ClassManifest
implicit parameter from scope (in this case, provided by a context bound)
to remember Ts that have been passed to invoke mkGenericArray and
use that information to instantiate arrays at runtime (via Java reflection).
When redesigning manifests into what is now known as type tags, we decided
to explore a notion of ArrayTags that would stand for abstract and pure array
creators. Sure, ClassManifests were perfectly fine for this job, but they did
too much - technically speaking, one doesn't necessarily need a java.lang.Class
to create an array. Depending on a platform, e.g. within JavaScript runtime,
one would want to use a different mechanism.
As tempting as this idea was, it has also proven to be problematic.
First, it created an extra abstraction inside the compiler. Along with class tags
and type tags, we had a third flavor of tags - array tags. This has threaded the
additional complexity though implicits and typers.
Second, consequently, when redesigning tags multiple times over the course of
Scala 2.10.0 development, we had to carry this extra abstraction with us, which
exacerbated the overall feeling towards array tags.
Finally, array tags didn't fit into the naming scheme we had for tags.
Both class tags and type tags sound logical, because, they are descriptors for
the things they are supposed to tag, according to their names.
However array tags are the odd ones, because they don't actually tag any arrays.
As funny as it might sound, the naming problem was the last straw
that made us do away with the array tags. Hence this commit.
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A must read: "SIP: Scala Reflection":
https://docs.google.com/document/d/1Z1VhhNPplbUpaZPIYdc0_EUv5RiGQ2X4oqp0i-vz1qw/edit
Highlights:
* Architecture has undergone a dramatic rehash.
* Universes and mirrors are now separate entities:
universes host reflection artifacts (trees, symbols, types, etc),
mirrors abstract loading of those artifacts (e.g. JavaMirror loads stuff
using a classloader and annotation unpickler, while GlobalMirror uses
internal compiler classreader to achieve the same goal).
* No static reflection mirror is imposed on the user.
One is free to choose between lightweight mirrors and full-blown
classloader-based mirror (read below).
* Public reflection API is split into scala.reflect.base and scala.reflect.api.
The former represents a minimalistic snapshot that is exactly enough to
build reified trees and types. To build, but not to analyze - everything smart
(for example, getting a type signature) is implemented in scala.reflect.api.
* Both reflection domains have their own universe: scala.reflect.basis and
scala.reflect.runtime.universe. The former is super lightweight and doesn't
involve any classloaders, while the latter represents a stripped down compiler.
* Classloader problems from 2.10.0-M3 are solved.
* Exprs and type tags are now bound to a mirror upon creation.
* However there is an easy way to migrate exprs and type tags between mirrors
and even between universes.
* This means that no classloader is imposed on the user of type tags and exprs.
If one doesn't like a classloader that's there (associated with tag's mirror),
one can create a custom mirror and migrate the tag or the expr to it.
* There is a shortcut that works in most cases. Requesting a type tag from
a full-blown universe will create that tag in a mirror that corresponds to
the callsite classloader aka `getClass.getClassLoader`. This imposes no
obligations on the programmer, since Type construction is lazy, so one
can always migrate a tag into a different mirror.
Migration notes for 2.10.0-M3 users:
* Incantations in Predef are gone, some of them have moved to scala.reflect.
* Everything path-dependent requires implicit prefix (for example, to refer
to a type tag, you need to explicitly specify the universe it belongs to,
e.g. reflect.basis.TypeTag or reflect.runtime.universe.TypeTag).
* ArrayTags have been removed, ConcreteTypeTag have been renamed to TypeTags,
TypeTags have been renamed to AbsTypeTags. Look for the reasoning in the
nearby children of this commit. Why not in this commit? Scroll this message
to the very bottom to find out the reason.
* Some of the functions have been renamed or moved around.
The rule of thumb is to look for anything non-trivial in scala.reflect.api.
Some of tree build utils have been moved to Universe.build.
* staticModule and staticClass have been moved from universes to mirrors
* ClassTag.erasure => ClassTag.runtimeClass
* For the sake of purity, type tags no longer have erasures.
Use multiple context bounds (e.g. def foo[T: ru.TypeTag : ClassTag](...) = ...)
if you're interested in having both erasures and types for type parameters.
* reify now rolls back macro applications.
* Runtime evaluation is now explicit, requires import scala.tools.reflect.Eval
and scala-compiler.jar on the classpath.
* Macro context now has separate universe and mirror fields.
* Most of the useful stuff is declared in c.universe,
so be sure to change your "import c.universe._" to "import c.mirror._".
* Due to the changes in expressions and type tags, their regular factories
are now really difficult to use. We acknowledge that macro users need to
frequently create exprs and tags, so we added old-style factories to context.
Bottom line: almost always prepend Expr(...)/TypeTag(...) with "c.".
* Expr.eval has been renamed to Expr.splice.
* Expr.value no longer splices (it can still be used to express cross-stage
path-dependent types as specified in SIP-16).
* c.reifyTree now has a mirror parameter that lets one customize the initial
mirror the resulting Expr will be bound to. If you provide EmptyTree, then
the reifier will automatically pick a reasonable mirror (callsite classloader
mirror for a full-blown universe and rootMirror for a basis universe).
Bottom line: this parameter should be EmptyTree in 99% of cases.
* c.reifyErasure => c.reifyRuntimeClass.
Known issues:
* API is really raw, need your feedback.
* All reflection artifacts are now represented by abstract types.
This means that pattern matching against them will emit unchecked warnings.
Adriaan is working on a patch that will fix that.
WARNING, FELLOW CODE EXPLORER! You have entered a turbulence zone.
For this commit and its nearby parents and children
tests are not guaranteed to work. Things get back to normal only after
the "repairs the tests after the refactoring spree" commit.
Why so weird? These twentish changesets were once parts of a humongous blob,
which spanned 1200 files and 15 kLOC. I did my best to split up the blob,
so that the individual parts of the code compile and make sense in isolation.
However doing the same for tests would be too much work.
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As a result, hardwired macros don't need implementation stubs.
This is very important, because in a few commits scala.reflect.makro.Context
will move out from scala-library.jar.
Also adding fast track entries doesn't require jumping through hoops
with PDTs. It's as simple as defining PartialFunction[Tree, Any].
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Since we still fail in locker.comp.
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* introduces ArrayTag and ErasureTag
* all type tags now feature erasure
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Implements SIP 16: Self-cleaning macros: http://bit.ly/wjjXTZ
Features:
* Macro defs
* Reification
* Type tags
* Manifests aliased to type tags
* Extended reflection API
* Several hundred tests
* 1111 changed files
Not yet implemented:
* Reification of refined types
* Expr.value splicing
* Named and default macro expansions
* Intricacies of interaction between macros and implicits
* Emission of debug information for macros (compliant with JSR-45)
Dedicated to Yuri Alekseyevich Gagarin
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Have you often thought that programming is just like the
movie 'Hackers', only with less rollerblading? Now that we
have @inline skates, that last caveat can be retired.
It's just like the movie 'Hackers'.
Signed-off-by: Zero Cool
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And grueling recovery from branch drift.
Merges a portion (and only a portion) of topic/inline into master.
The major changes which come with this merge are:
AnyVal is unsealed, can be extended directly.
ScalaObject is no longer with us.
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-- traits can extend Any, AnyRef, or AnyVal
-- classes can extend AnyRef or AnyVal but not Any.
This breaks reflection for the moment as it smuggles AnyVal so far
downstream that it's reflecting its way into bytecode (or something)
but the following test case goes five for six as anticipated.
trait Foo1 extends Any
trait Foo2 extends AnyVal
trait Foo3 extends AnyRef
class Bar1 extends Any // fail
@inline class Bar2 extends AnyVal
class Bar3 extends AnyRef
Eliminated various hijinx from definitions.
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Solved the annotation cycle puzzle. Was being burned again by
the hack which preferentially treats List() as Nil to avoid List's
extractor.
This commit includes a new starr which fully bootstraps.
Also at this point traits can extend Any and will not be given
an AnyRef parent (until erasure.) This is the case for AnyVal
and NotNull.
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Free at last, free at last, of ScalaObject we're free at last.
(With apologies to the Reverend, but the man had a way with words.)
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It took me a long time to find a trivial error while adjusting the
annotation packages, so I spent even longer trying to make sure next
time it would take me less time. It's the usual business of eliminating
duplication and unnecessary indirection.
Behavioral note: there was no consistency or deducible reasoning
regarding when annotation checks would be performed against the
typeSymbol directly (thus excluding annotation subclasses) or when they
would do a subclass check. I saw no reason it shouldn't always be a
subclass check; if the annotation isn't supposed to be subclassed it
should be final, and if it is, then the subclasses had probably better
not stop exhibiting the behavior of the base class.
Example: this now draws deprecated warnings, but did not before.
class bippy extends deprecated("hi mom", "burma shave")
@bippy def f = 5
(The deprecation message isn't printed so we're not there yet, but
closer.)
There is some new internal documentation on annotations, sadly lacking
in my famous ascii diagrams, and some new conveniences. Review by rytz.
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Old Man Reflection is coming home and he's not going to like finding
out a bunch of beans have moved into his reflecting room. We had better
evict those guys before he blows his stack.
scala.reflect.*Bean* --> scala.beans.*
scala.beans, that's kind of a fancy package name for some beans. I
figure it's time to start fishing or cutting bait on this kind of thing.
I don't even know what beans are, but if we're going to have them in the
mainline, the least surprising place to find them is scala.beans. If we
don't want to put them in scala.beans for whatever reason, then I say
they don't belong in trunk at all.
Bonus round:
scala.annotation.target --> scala.beans.meta
I don't know if there is any more unfortunate name for a package
possible than "target". Maybe ".svn" or ".git" if you could have dots
in package names. Package CVS wouldn't hit too hard these days. Package
lib_managed? I'll try to come up with something. In any case this golden
opportunity could not be squandered.
There is a new starr included, because GenJVM contains all kinds of
shooting-from-the-hip Bean-related name hardcoding. (Yes, still. I ran
out of stones. So a few birds escape with their lives... this time.)
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New starr based on r25394 to make the starr liberator's job easier, no
review.
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The AnyVal types become source files instead of polite compiler
fictions.
!! You'll need a serious "ant all.clean" now. !!
As of this commit the system is fully bootstrapped and the
synthetic code eliminated: only the source files remain. The
sort-of-AnyVal-companions in scala.runtime.* have all been eliminated
because the actual companions can do everything; deprecated vals in
the scala.runtime package object point to the companions. This left
AnyValCompanion as the only AnyVal related thing in the runtime package:
that made little sense, so I deprecated and moved it as well.
Starr is based on r24066 plus this commit. Closes #4121. Review by rytz,
odersky.
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More fixes to avoid the dreaded "NoSymbol does not have owner" problem
in names defaults.
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again: relax access boundry check for overriding protected java members.
review by eugenevigdorchik.
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