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I started out looking to limit the noise from empty type
bounds, i.e. the endless repetition of
class A[T >: _root_.scala.Nothing <: _root_.scala.Any]
This led me to be reminded of all the unnecessary and
in fact damaging overreaches which are performed during parsing.
Why should a type parameter for which no bounds are
specified be immediately encoded with this giant tree:
TypeBounds(
Select(Select(Ident(nme.ROOTPKG), tpnme.scala_), tpnme.Nothing),
Select(Select(Ident(nme.ROOTPKG), tpnme.scala_), tpnme.Any)
)
...which must then be manually recognized as empty type bounds?
Truly, this is madness.
- It deftly eliminates the possibility of recognizing
whether the user wrote "class A[T]" or "class A[T >: Nothing]"
or "class A[T <: Any]" or specified both bounds. The fact
that these work out the same internally does not imply the
information should be exterminated even before parsing completes.
- It burdens everyone who must recognize type bounds trees,
such as this author
- It is far less efficient than the obvious encoding
- It offers literally no advantage whatsoever
Encode empty type bounds as
TypeBounds(EmptyTree, EmptyTree)
What could be simpler.
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Top-level (i.e. owned by a package) => Ident(symbol)
Nested (i.e. owned by an object or a package object) => Select(owner, symbol)
Inner (i.e. owned by a static class) => selectTerm/selectType(owner, name)
Non-locatable (i.e. everything else) => see GenTrees.scala for more details
Changes w.r.t the previous approaches:
* Top-level refs are no longer reified as Select(This(package), symbol).
Proposed reification scheme is as resistant to resetAttrs as previous one,
but is at the same time much shorter.
* Refs to definitions from package objects are no longer Ident(symbol).
Otherwise reflective compilation of things like `_ :: _` fails.
* Contents of Predef._ and scala._ are no longer treated specially.
This increases the size of reificode, but is more hygienic.
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This brings all the files into line with the .gitattributes
settings, which should henceforth be automatically maintained
by git.
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this uncovers a bug in toolboxes: https://issues.scala-lang.org/browse/SI-6007
however that bug is not critical, so it will be dealt with later
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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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