HiddenType is a new TypeBase subclass that carries a mangled name
without leaking the actual type definition. It serves as a type-slot
placeholder for stored-property types that have been elided from a
serialized binary module, so that the client side can either
(1) resolve this mangled name to the real type if the client has access to the owning module, or
(2) use the mangled name as a key to query abstract layout information also serialized in the binary module.
As an example — a library with a hidden field of a bridging-imported type:
```
// Utility.h (internal bridging header)
// typedef struct { int value; } Wrapper;
public struct S {
private var w: Wrapper
public var weight: Double
}
In the serialized module, the client's view reconstructs as:
public struct S {
private var w: @_hidden("$sSo7Wrappera")
public var weight: Double
}
```
The @diagnose attribute only affects local diagnostic behavior within a declaration's body and has no API or ABI impact. It should not appear in .swiftinterface files, and should not cause declarations to be wrapped in #if $SourceWarningControl feature guards.
Similarly to `@isolated(any)` it's sometimes necessary to check
whether a call is to a `nonisolated(nonsending)` function value
i.e. for hop elimination pass and without this isolation support
it has to go trying to figure out the isolation from a callee
which is not possible if it doesn't refer to a `SILFunction *`.
Homogeneous unlabeled tuples with many elements produce unwieldy type
names in diagnostics (e.g. C fixed-size arrays). Print them in compact
`(N of T)` form when there are 5+ elements, mirroring the style used
in `TypePrinter.visitInlineArrayType()` and SE-0483.
Add `PrintOptions.PrintHomogeneousTuplesCompactly`, enabled only in
diagnostic print paths. Type equality uses pointer comparison to avoid
coalescing differently-sugared types.
These will be used internally by the type checker to represent bindings
that are the joins and meets of types involving type variables. They
will not appear anywhere outside of the bindings code---so you won't
see them in expressions, or matchTypes(), etc.
Previously, the `@_accessorBlock` disambiguation attribute was only
emitted for observed variables. But We need `@_accessorBlock`
disambiguation marker for simple stored properties with non-public
setters in `@frozen` types too.
rdar://171819084
Skip printing inherited constructors defined in modules that are not
publicly imported.
This prevents interface verification errors where types are used but
their modules aren't in the import list.
rdar://168101765
Introduce new syntax for parsing arbitrary integer literal expressions for generic value arguments:
```swift
InlineArray<(<Expr>), T>
[(<Expr>) of T]
```
Which, for now, will co-exist alongside the current syntax of simple integer literals.
Replace `IntegerTypeRepr` with `GenericArgumentExprTypeRepr`, a new `TypeRepr` node that wraps arbitrary expressions in generic argument positions (e.g., `InlineArray<(1 + 3), Int>`). The node tracks resolution state, distinguishing whether the expression resolved to a type or an integer value.
Key changes:
- Parse parenthesized generic arguments as expressions
- Recover and distinguish types from integer expressions in `resolveGenericArgumentExprTypeRepr`.
- When the `LiteralExpressions` feature is enabled, type-check and constant-fold expressions to integer values
- Extract `PreCheckTarget` into a public header to expose `simplifyTypeExpr` for use during type resolution
Resolves rdar://168005391
Non-Escapable 'inout' arguments have a default self-dependency, regardless of
any other annotations. For example:
@_lifetime(dest: copy source)
/* DEFAULT: @_lifetime(dest: copy dest, copy source) */
func foo<T: ~Escapable>(dest: inout T, source: T)
An immortal lifetime specifier now suppresses that default. For example:
@_lifetime(dest: immortal, copy source)
/* DEFAULT: @_lifetime(dest: copy source) */
func foo<T: ~Escapable>(dest: inout T, source: T)
This is necessary because there is otherwise no other way to suppress the
default lifetime.
Fixes rdar://170016708 ([nonescapable] Support @_lifetime(immortal) to suppress
the usual inout default self-dependency)
Qualification has discovered a complicated test case where the module interface printer incorrectly adds module selectors to nested types that don’t support them. Tweak module interface printing to omit the module selector in more situations.
Fixes rdar://169720990.
In #86859, I modified the way `export_as` names are used in private module interfaces so that the `export_as` name is used when that module has been imported. This turns out to be slightly too aggressive in a specific scenario where a submodule of the export_as module imports a submodule of the real module—the compiler ends up using the export name even though the resulting lookup won’t actually work.
Modify the logic for deciding whether to use an exported module name so that it not only checks whether the export_as module has been loaded, but also whether the specific module or submodule the declaration belongs to is (possibly transitively) imported by that module.
Fixes rdar://167874630 (harder).
Modify relevant portions of the type-checker and parser to allow, when the 'LiteralExpressions' experimental feature is enabled, for arbitrary integer-typed expressions in enum raw value specifiers. These expressions will be type-checked and constant-folded into an integer literal expression, keeping the current interface of 'EnumElementDecl' consistent for clients.
Previously, 'EnumRawValuesRequest' had two different "modes" which were discerned based on typechecking stage (structural | interface), where the former had the request compute all raw values, both user-specified literal expressions and computing increment-derived values as well; the latter would also type-check the user-specified expressions and compute their types.
- With the need to have enum case raw values support arbitrary integer expressions, the request ('EnumRawValuesRequest') has been refactored and simplified to *always* both compute all case raw values and perform type-checking of user-specified raw value expressions. This is done in order to allow the AST-based constant-folding infrastructure ('ConstantFoldExpression' request) to run on the expressions. Constant folding is invoked during the evaluation of 'EnumRawValuesRequest' on all user-specified raw value expressions, in order to be able to compute subsequent increment values and ensure the expressions are foldable. If they are not, i.e. if constant folding fails, a relevant diagnostic will be emitted.
- 'EnumElementDecl' continues to store the raw value expression, which is no longer a 'LiteralExpr' but rather an 'Expr'; however, the getter ('getRawValueExpr') continues to return a 'LiteralExpr' by invoking the constant-folding request on the stored value, which is guaranteed to return a cached result from a prior invocation in 'EnumRawValuesRequest', assuming it succeeded.
- Furthermore, the 'structural' request kind was previously not cached, whereas now because the request must always do the complete type-checking work, it is always cached.
Resolves rdar://168005520
Given that we implicitly expanded Copyable & Escapable
conformance requirements for suppressed primary associated
types, we now need this function to do the opposite;
filtering Copyable & Escapable requirements on such primary
associated types and adding inverses if those requirements
are missing.
This function plays a crucial role in emitting the interface
files accurately for functions and types, in addition to
how we mangle generic signatures into function symbols.
The mangling for generic signatures under the -WithDefaults version of
suppressed associated types goes like this:
- primary associated type T.A has an inverse `Rj` or `RJ` mangled
into the generic signature if it lacks the conformance, or
nothing is mangled into it.
- non-primary associated type T.B has either a `T.B: Copyable`
requirement mangled into it, or nothing is mangled into it.
For the legacy SuppressedAssociatedTypes feature, where there's no
defaults, it uses the "non-primary assocated type" mangling strategy
for all generic signatures.
If printing is for a package interface, let's add derived/implied `Sendable`
conformance to avoid having to infer it while type-checking the interface
file later. Such inference is not always possible, because i.e. a package
declaration can have private storage that won't be printed in a package
interface file and attempting inference would produce an invalid result.
Resolves: rdar://166159992
We may visit and thus import these members in an unpredictable order.
To avoid future churn for module interface test cases, sort the printed
module interface output according to some rough heuristics.
The `@reparented` was missing and a typealias
was being synthesized unexpectedly, creating
an issue when typechecking the interface later.
There's no fundamental reason why typealiases
cannot be supported to say the same thing as
the same-type requirement, but I think the
same-type requirement is always needed to be
written on the extension, one way or another.
For now I've chosen to only go with an
explicitly-written same-type requirement.
We fall back to indices when labels are not available, but labels are
preferable, because they readable, stable, and preferred by the lifetime
dependencies proposal.
Previously, if a declaration belonged to a module with an `export_as` attribute, Swift always used the exported module name in the public module interface and the real module name in the private module interface. However, this is only a rough approximation of the behavior we really want, which is to use the real name in module interfaces that might be imported by dependencies of the exported name.
Change this logic so that public interfaces always use the exported name, and private interfaces use the exported name *only* if a module with that name has been loaded. This should make it so that if you’re building the `export_as` module or anything that imports it, you use the exported name; otherwise you use the real name.
Fixes rdar://167874630.
Xi Ge
Aidan Hall
Aidan Hall
Artem Chikin
Konrad Malawski
Pavel Yaskevich
Pavel Yaskevich
broken-circle
Slava Pestov
susmonteiro
Rintaro Ishizaki
Sam Pyankov
Becca Royal-Gordon
Andrew Trick
Kavon Farvardin
John Hui
Meghana Gupta
Joe Groff
elsa
Erik Eckstein