This makes more efficient use of the permanent memory allocated for
`AvailabilityContext` representations and also fixes a leak that was introduced
in https://github.com/swiftlang/swift/pull/79718 where the small vector for
unavailable domain storage was not being cleaned up on `ASTContext`
deallocation.
Resolves rdar://145929932.
This is the missing check for "rule #1" in the isolated conformances proposal,
which states that an isolated conformance can only be referenced within
the same isolation domain as the conformance. For example, a
main-actor-isolated conformance can only be used within main-actor code.
Rig TransitiveAddressWalker to keep track of enough information for passes to
correctly check for pointer escapes and dependence uses. Requires for precise
bail-outs and asserts.
Choose names that don't imply availability is versioned, since custom
availability will support domains that are version-less (they are simply
available or unavailable).
This utility was simply ignoring the dependent value. But the
dependent value logically uses the base address. Until this is
correctly implemented, conservatively consider it a pointer-escape.
Introduce `SemanticAvailableAttr` conveniences to compute the deprecated and
obsoleted ranges for an attribute and ensure they remap versions when needed.
Within the constraint system, introduce a new kind of conformance constraint,
a "nonisolated conforms-to" constraint, which can only be satisfied by
nonisolated conformances. Introduce this constraint instead of the normal
conforms-to constraint whenever the subject type is a type parameter that
has either a `Sendable` or `SendableMetatype` constraint, i.e., when the type
or its values can escape the current isolation domain.
Witness checking itself is allowed to skip `@Sendable` mismatch in this
situation. This is a narrow fix for `SendableCompletionHandlers` feature
to make sure that the behavior doesn't change for non-ObjC witnesses
This simplifies the code to emit availabilty diagnostics and ensures that they
display domain names consistently. While updating existing diagnostics, improve
consistency along other dimensions as well.
Delay resolution of availability domain identifiers parsed in availability
specifications until type-checking. This allows custom domain specifications to
be written in `if #available` queries.
When it's available, use an open-coded allocator function that returns
an alloca without popping if the allocator is nullptr and otherwise
calls swift_coro_alloc. When it's not available, use the malloc
allocator in the synchronous context.
The serialized diagnostic format has some extra fields that we can
adopt for diagnostic groups. Specifically:
* Category: store the diagnostic group name here
* Flags: extend the hack used by educational notes of placing Markdown file paths here
