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- Make TypeCreator and TreeCreator extend Serializable.
- When replacing a SerializedTypeTag with a TypeTag or WeakTypeTag,
do not use scala.reflect.runtime.universe.rootMirror, since
it is unlikely to find user classes; instead, create a runtime
mirror using the context ClassLoader of the current thread.
Use the same logic for SerializedExpr.
- Remove writeObject/readObject methods from SerializedTypeTag
and SerializedExpr since they are unused.
- Add @throws annotation on writeReplace and readResolve methods.
- Handle SecurityException if the current thread cannot access the
context ClassLoader.
- To make type tags of primitive value classes serializable, make
PredefTypeCreator a top-level class. Otherwise, it would
retain a reference to the enclosing Universe,
rendering the TypeCreator non-serializable.
Binary compatibility:
- Keep nested PredefTypeCreator class to avoid backward binary
incompatible change.
- Keep `var` modifiers on the class parameters of
SerializedTypeTag for backward binary compatibility.
- Adds filter rules to forward binary compatibility whitelist:
- `TypeCreator`, `PredefTypeCreator`, and `TreeCreator` must now
extend from `Serializable`.
- Must have new class `scala.reflect.api.PredefTypeCreator`
to avoid problematic outer reference.
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Confusing, now-it-happens now-it-doesn't mysteries lurk
in the darkness. When scala packages are declared like this:
package scala.collection.mutable
Then paths relative to scala can easily be broken via the unlucky
presence of an empty (or nonempty) directory. Example:
// a.scala
package scala.foo
class Bar { new util.Random }
% scalac ./a.scala
% mkdir util
% scalac ./a.scala
./a.scala:4: error: type Random is not a member of package util
new util.Random
^
one error found
There are two ways to play defense against this:
- don't use relative paths; okay sometimes, less so others
- don't "opt out" of the scala package
This commit mostly pursues the latter, with occasional doses
of the former.
I created a scratch directory containing these empty directories:
actors annotation ant api asm beans cmd collection compat
concurrent control convert docutil dtd duration event factory
forkjoin generic hashing immutable impl include internal io
logging macros man1 matching math meta model mutable nsc parallel
parsing partest persistent process pull ref reflect reify remote
runtime scalap scheduler script swing sys text threadpool tools
transform unchecked util xml
I stopped when I could compile the main src directories
even with all those empties on my classpath.
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Additionally includes improvements, formatting fixes, and link
additions and fixes.
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The name looks weird in the scaladoc overview panel,
so I decided to do a last-minute rename.
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As the experience has shown, there's no need for a separate layer of reflection
in scala-library.jar. Therefore I'm putting an end to it.
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