| Commit message (Collapse) | Author | Age | Files | Lines |
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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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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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Annotations are now supported by the reifier:
* AnnotationInfos from symbols get transformed back into mods.
* AnnotatedTypes are retained and are reified along with AnnotationInfos.
Reification is no magic, and reification of annotations especially:
* Annotations cannot refer to symbols defined inside the quasiquote.
This restriction is due to the fact that we need to erase locally defined
symbols before reifying to make subsequent reflective compilations succeed.
However, while doing that, we also need to make sure that we don't make
resulting ASTs non-compilable by removing essential information.
This is tricky, and it more or less works for TypeTrees, but
not for annotations that can contain arbitrary ASTs.
For more details look into the comments to Reifiers.scala.
* Classfile annotations that contain array arguments and are applied to types,
i.e. the ones that generate AnnotatedTypes, cannot be reified.
This is because of limitations of manifest infrastructure.
Typechecking "Array(mirror.LiteralAnnotArg(...))" would require the compiler
to produce a manifest for a path-dependent type, which cannot be done now.
Review by @odersky.
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