This is the beginning of the extension of the availability model
introduced in Swift 2.0 to support two interesting things: inlineable
code and binary frameworks not tied to an OS. The former is critical
to having a stable standard library that isn't shipped with a client app.
(For more information on both of these, see docs/LibraryEvolution.rst.)
The existing availability model enforces that API is not used unless
the developer has already guaranteed its existence. We want to reuse
this logic for these new purposes. Additionally, certain queries about
the AST are dependent on this type of information as well, e.g. "can I
assume this enum will not grow any additional cases?" If the enum comes
from the module being compiled, the answer is usually "yes", but not if
the code asking the question may be inlined into another binary!
(This latter purpose is currently served by ResilienceExpansion down at
the SIL level; my goal is to replace ResilienceExpansion with
AvailabilityContext. It's a bit heavier but would also allow additional
optimization in the future.)
This commit does not change any logic; it only wraps existing uses of
VersionRange in AvailabilityContext if they're not strictly referring to
the OS version.
Following Jordan's advice, replace "join" with "union" and "meet" with
"intersect" in VersionRange to make it clear which direction these operations
go in the lattice of ranges.
Swift SVN r31640
Add a join (least upper bound) operation to the availability version range
lattice. A later commit will use this to reason about the disjunctive
else-branch flow for conditions with multiple conjunctive statement conditions.
This is part of rdar://problem/22307360.
Swift SVN r31610
Based on feedback from Jordan, update r30060 to synthesize availability
attributes on unannotated Obj-C protocols in the importer. This has a
user-visible effect: calls to protocol requirements with these synthesized
attributes will now cause an availability error if the requirement is not
available in the calling type refinement context.
Swift SVN r30096
This came out of today's language review meeting.
The intent is to match #available with the attribute
that describes availability.
This is a divergence from Objective-C.
Swift SVN r28484
To be safe, protocol witnesses need to be as available as their requirements.
Otherwise, the programmer could access an unavailable declaration by upcasting
to the protocol type and accessing the declaration via its requirement.
Prior to this commit, we enforced safety by requiring that the annotated
available range of a requirement must be completely contained within the
annotated available range of the witness.
However, there are cases where this requirement is too restrictive. Suppose
there is some super class Super with an availability-restricted method f():
class Super {
@availability(iOS, introduced=6.0)
void func f() { ... }
}
Further, suppose there is a protocol HasF with unrestricted availability:
protocol HasF {
void func f()
}
and then a limited-availability class Sub extends Super and declares a
conformance to HasF:
@availability(iOS, introduced=8.0)
class Sub: Super, HasF {
}
Sub does conform to HasF: the witness for HasF's f() requirement is Super's f().
But Super's f() is less available (iOS 6 and up) than HasF's f() requires
(all versions) and so--prior to this commit--the compiler would emit
an error.
This error is too conservative. The conforming type, Sub,
is only available on iOS 8.0 and later. And, given an environment of iOS 8.0
and later, the availability of the requirement and the witness is the same, so
the conformance is safe.
This false alarm arises in UIKit, where Super is UIView, HasF
is UIGestureRecognizerDelegate, and f() is gestureRecognizerShouldBegin().
The fix is to change the safety requirement for protocol witnesses:
we now require that the intersection of the availabilities of the conforming
type and the protocol requirement is fully contained in the intersection of the
availabilities of the conforming type and the witness. It does not matter if
the containment does not hold for versions on which the conforming type is not
available.
rdar://problem/20693144
Swift SVN r27712
When synthesizing a designated initializer override, we now ensure that the synthesized
initializer has the same availability as the initializer it is overriding.
Swift SVN r26732
llvm::Optional lives in "llvm/ADT/Optional.h". Like Clang, we can get
Optional in the 'swift' namespace by including "swift/Basic/LLVM.h".
We're now fully switched over to llvm::Optional!
Swift SVN r22477
This commit adds tracking of the reason a declaration reference is potentially
unavailable to the UnavailableToOptionalExpr AST node and to OverloadChoice. We
will use this reason during SILGen to emit the appropriate run-time check and
during typechecking to provide more helpful diagnostics.
To keep OverloadChoice as small as possible, we encode the reason as an index
into a vector of reasons stored in a given instance of ConstraintSystem (this is
the same approach that Fix takes).
This commit adds Sema/OverloadChoice.cpp (for the parts of OverloadChoice that
now rely on ConstraintSystem) and AST/Availability.h (to bring in
availability-related structures without TypeRefinementContext).
Swift SVN r22377
