This attribute forces programmers to acknowledge every
copy that is required to happen in the body of the
function. Only those copies that make sense according
to Swift's ownership rules should be "required".
The way this is implemented as of now is to flag each
non-explicit copy in a function, coming from SILGen, as
an error through PerformanceDiagnostics.
When emitting diagnostics for the Embedded Swift restrictions outside
of Embedded Swift mode, consider `#if $Embedded` and `#if
hasFeature(Embedded)` configurations. If the code where we would emit
the diagnostic would be disabled in Embedded Swift by one of those
checks, don't emit the diagnostic. This helps code that can compile
either with Embedded or regular Swift stay within the restrictions on
Embedded Swift.
Part of the Embedded Swift linkage model, this attribute ensures that
the function it applies to has a strong definition in its owning
module, and that its SIL is never serialized. That way, other modules
will not have access to its definition.
Implements rdar://158364184.
This is an accepted spelling for the attribute. This commit
also renames the feature flag from `ExtensibleAttribute` to
`NonexhaustiveAttribute` to match the spelling of the attribute.
Implements SE-0460 -- the non-underscored version of @specialized.
It allows to specify "internal" (not abi affecting) specializations.
rdar://150033316
This includes changing the feature name so that compilers with the experimental feature don’t accidentally pick up content that only works in the final version.
Resolves rdar://150065196.
Just like `@preconcurrency` for concurrency, this attribute is going
to allow exhaustiveness error downgrades for enums that were retroactively
marked as `@extensible`.
The diagnostics formatter from swift-syntax previously only handled
fully-formed diagnostics anchored at a particular syntax node.
Therefore, the compiler would fall back to the existing LLVM-based
diagnostic formatter for diagnostics that had no source location.
Adopt new API in the swift-syntax diagnostics formatter that renders a
diagnostic message without requiring source location information, so
that we consistently use the swift-syntax formatter when it is
selected (which is the default).
