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`Symbol.getFlag`, 'Symbol.hasFlag`, `Symbol.hasAllFlags`, `Symbol.annotations`
and `Symbol.privateWithin` now trigger automatic initialization of symbols
if they are used in a runtime reflection universe and some other conditions
are met (see `Symbol.needsInitialize` for details).
As the performance testing in https://github.com/scala/scala/pull/1380 shows,
this commit introduces a ~2% performance regression of compilation speed.
Unfortunately all known solutions to the bug at hand (A, B & C - all of those)
introduce perf regressions (see the pull request linked above for details).
However we're under severe time pressure, so there's no more time to explore.
Therefore I suggest this is reasonable to accept this performance hit,
because we've just gained 6% from removing scala.reflect.base,
and even before that we were well within our performance goal for 2.10.0-final.
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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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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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Since Scala reflection relies on Java reflection to perform member invocations,
it inherits some of the quirks of the underlying platform.
One of such quirks is returning null when invoking a void-returning method.
This is now fixed by introducing a check after calling invoke.
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In Scala there are some methods that only exist in symbol tables,
but don't have corresponding method entries in Java class files.
To the best of my knowledge, these methods can be subdivided into five groups:
1) stuff weaved onto Any, AnyVal and AnyRef (aka Object),
2) magic methods that Scala exposes to fix Java arrays,
3) magic methods declared on Scala primitive value classes,
4) compile-time methods (such as classOf and all kinds of macros),
5) miscellaneous stuff (currently only String_+).
To support these magic symbols, I've modified the `checkMemberOf` validator
to special case Any/AnyVal/AnyRef methods and adjusted MethodMirror and
ConstructorMirror classes to use special invokers for those instead of
relying on Java reflection.
Support for value classes will arrive in the subsequent commit, because
it requires some unrelated changes to the mirror API (currently mirrors
only support AnyRefs as their targets).
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