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- `await` can now be used inside the body of `try` and `finally`
- using `await` inside the cases of a `catch` is illegal
- provides precise error messages ("await must not be used under catch")
- adds 9 tests
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- remove CPS dependency from default async implementation (fix #55)
- move all CPS-related code to `continuations` sub package
- fix CPS-based async implementation
- enable testing of CPS-based async implementation
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This is a re-implementation of a previous fix. It is more modular, since
it enables the definition of a CPS-based fall-back as a subclass of `AsyncBase`.
Thus, it's possible to define fall-back-enabled subclasses of `AsyncBase`
targetting not only Scala Futures.
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Topic/patmat partial function
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- Undo the transformation that takes place in Typers to
leave us with Match(EmptyTree, cases).
- Make sure we don't descend into the cases of such a
tree when peforming the async transform
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Fix ANF transform involving `xs: _*` trees.
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We need to unwrap and inline `xs`, then
rewrap the result expression with the wildcard
star.
Addresses the first half of #46.
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We use `isExprSafeToInline` from the non-public reflection
API to check. In addtion, we now that an untyped Ident("await$N")
is also an inlinable expression.
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We can allow it, but we need to treat nested
Apply trees holistically, in order to lift out
all the arguments and maintain the correct
evaluation order.
Fixes #33.
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- If we lift one arg, we must lift them all.
This preserves evaluation order.
- But, never lift an by-name arg
Addresses the first half of #33.
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And change TreeInterrogation to set if via this means,
rather than through a direct means, which seems to
assume too much about classloaders.
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This augments the on-complete handler for an async state with await as follows:
if (tr.isFailure)
result$async.complete(tr.asInstanceOf[Try[T]])
else {
<resultName> = tr.get.asInstanceOf[<resultType>]
<nextState>
<mkResumeApply>
}
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Port futures tests of scala.concurrent
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These tests do not use async/await, yet.
Refs #23
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We can then use this as a replacement for `Future { expr }`.
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We need not, and should not, rename definitions
beyond the scope of the async transform, e.g.
in nested classes of function bodies.
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To avoid suprises in tree retyping, the instance of this
class is immediately upcase to
StateMachine[Promise[T], ExecContext].
Allow nested non-case classes. These pop up when
we use nested async calls.
Only look for duplicate names in the subtrees
traversed by AsyncTraverser.
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Adapt the compiler's standard ResetAttrs to keep
This() nodes don't refer to a symbol defined in the
current async block.
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There is a fly in the ointment: any This() trees in the provided
code are getting rebound to this class. Sounds like more
resetAttrs fun ahead.
The object also serves as the Future {} thunk.
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Any vals referred to in the body of these
must also be lifted.
Fixes #36
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The type-checking performed in ANF transform is
precarious, and needed to use the original condition/
scrutinee in a throwaway tree to get things to work.
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These gives us something to lift to vars to be accessed
from multiple states of the state machine.
Fixes #35
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Fix #19
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- Add tests where the result of an await is assigned to a variable external
to the async block.
- Clean up HygieneSpec.
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This refactoring removes a group of factory methods.
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Brings uniformity to the result generation of AsyncStateBuilder.
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Rather than three separate parameters.
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No more extension from concrete classes; no more
dummy values for nextState.
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- Moving some private methods out of the top-billing at the
head of the file
- Replace three nullable fields with one Option.
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Goal is to make ExprBuilder less cluttered.
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