The existing verification seems unnecessarily brittle, but this isn't
a general fix for that problem. This fixes one instance of where we
are generating perfectly valid pointer conversions that the verifier
is currently blowing up on.
I've opened https://bugs.swift.org/browse/SR-8264 to track reworking
this verification to not be quite so brittle.
More groundwork for protocols with superclass constraints.
In several places we need to distinguish between existential
types that have a superclass term (MyClass & Proto) and
existential types containing a protocol with a superclass
constraint.
This is similar to how I can write 'AnyObject & Proto', or
write 'Proto1 & Proto2' where Proto1 has an ': AnyObject'
in its inheritance clause.
Note that some of the usages will be revisited later as
I do more refactoring and testing. This is just a first pass.
The storage kind has been replaced with three separate "impl kinds",
one for each of the basic access kinds (read, write, and read/write).
This makes it far easier to mix-and-match implementations of different
accessors, as well as subtleties like implementing both a setter
and an independent read/write operation.
AccessStrategy has become a bit more explicit about how exactly the
access should be implemented. For example, the accessor-based kinds
now carry the exact accessor intended to be used. Also, I've shifted
responsibilities slightly between AccessStrategy and AccessSemantics
so that AccessSemantics::Ordinary can be used except in the sorts of
semantic-bypasses that accessor synthesis wants. This requires
knowing the correct DC of the access when computing the access strategy;
the upshot is that SILGenFunction now needs a DC.
Accessor synthesis has been reworked so that only the declarations are
built immediately; body synthesis can be safely delayed out of the main
decl-checking path. This caused a large number of ramifications,
especially for lazy properties, and greatly inflated the size of this
patch. That is... really regrettable. The impetus for changing this
was necessity: I needed to rework accessor synthesis to end its reliance
on distinctions like Stored vs. StoredWithTrivialAccessors, and those
fixes were exposing serious re-entrancy problems, and fixing that... well.
Breaking the fixes apart at this point would be a serious endeavor.
Introduce some metaprogramming of accessors and generally prepare
for storing less-structured accessor lists.
NFC except for a change to the serialization format.
Replace two prominent uses of SubstitutionList, in ConcreteDeclRef and
Witness, with SubstitutionMap. Deal with the myriad places where we
now have substitution maps and need substitution lists (or vice versa)
caused by this change.
Overall, removes ~50 explicit uses of SubstitutionList (of ~400).
...and add a verifier check to make sure we don't mix 'open' and
'final' in the future.
You could /write/ 'open let' in Swift 4.1, but you couldn't actually
override such a property (within the module or outside). To maintain
source compatibility, this is just going to emit a warning before
Swift 5 (instead of an error), since it wasn't harming anything in
practice.
...and fix places where it was being used inappropriately.
- Don't use 'open' on non-class members in the importer.
- Use the existing 'copyFormalAccessFrom' instead of an ad hoc version
for synthesized typealiases for protocol conformances. (This can
change 'internal' down to 'fileprivate', but only where the
enclosing type was already 'private' or 'fileprivate'.)
- Fix 'copyFormalAccessFrom' to not copy '@usableFromInline' onto
declarations that don't support it (namely, the above typealiases).
This should have no visible effect in practice.
LLDB creates global typealiases that have archetypes in them, which
violates AST invariants and trips up the AST verifier. Introduce a specific
bit that LLDB can set to indicate that a given typealias is such an alias.
We'll skip AST verification for such typealiases.
As a way to stage in this change without requiring synchronization
across the Swift and LLDB repos, also match typealiases with the names
$.*lldb in the AST verifier and skip verification. Once LLDB is
setting the bit appropriately, we'll remove this hack.
With the exception of “has type variable”, which affects the arena used
for storage of a BoundNameAliasType, only propagate recursive properties
from the underlying type to a BoundNameAliasType, because the other
properties (e.g., “has archetype” or “has type parameter”) pulled from
syntactic sugar don’t apply.
Also remove the decl from the known decls and remove a
bunch of code referencing that decl as well as a bunch of other
random things including deserialization support.
This includes removing some specialized diagnostics code that
matched the identifier ImplicitlyUnwrappedOptional, and tweaking
diagnostics for various modes and various issues.
Fixes most of rdar://problem/37121121, among other things.
This partially reverts commit 8685ee01a1.
The tests are still in place, but the code change is no longer necessary
now that IUOs are removed from the type system.
Fixes: rdar://problem/37013789
Allow passing Optional<T> as inout where
ImplicitlyUnwrappedOptional<T> is expected, and vice-versa.
Swift 4.1 added a warning that overloading inouts by kind of optional
was deprecated and would be removed, but we didn't actually allow
people to remove an overload and pass arguments of the other kind of
optional to the remaining function.
Fixes rdar://problem/36913150
This has three principal advantages:
- It gives some additional type-safety when working
with known accessors.
- It makes it significantly easier to test whether a declaration
is an accessor and encourages the use of a common idiom.
- It saves a small amount of memory in both FuncDecl and its
serialized form.
When testing KeyPathApplication constraints, we would keep going after rejecting a concrete KeyPath application by trying PartialKeyPath and AnyKeyPath, even though that's not what we want, since any key path application expression can type check with an AnyKeyPath. We would then miscompile by building the AST such that we applied the mismatched key path expression directly to the base. We also didn't handle expressions where the base was a subtype of the key path's base type correctly—the conversion means the base can't be written through in this situation, and we hardcoded the concrete-to-existential case instead of handling general conversions. Fix these problems, and add an AST verifier for KeyPathApplicationExprs to help catch problems in the future. Fixes SR-6300 | rdar://problem/35368903.
Attach this attribute to VarDecls declared as IUO, and to function decls
that have a result type that is an IUO.
NFC at the moment. Eventually we'll use these to determine where to
implicitly unwrap optional values.
When overriding storage with a forced static dispatch materializeForSet,
the override's materializeForSet should not override the base
materializeForSet.
This is the case where a dynamic property witnesses a protocol
requirement, and Sema synthesizes a materializeForSet for it.
In this case, the synthesized materializeForSet dynamically dispatches
to the dynamic property's getter and setter, and the protocol witness
thunk directly calls the synthesized materializeForSet.
The subclass only needs to override the getter and setter in this case,
since the base class's materializeForSet will already do the right
thing.
In fact, marking it as an override exposes a problem where we cannot
serialize an xref to an imported property's materializeForSet, since
it was not created by the importer.
Use this to remove the last bit of the hack to suppres noescape on setter
arguments. Add a more comprehensive test of noescape's interaction with
accessors.
In almost all other places, 'resolver' means the ASTContext's LazyResolver,
which is just an abstract base class for the TypeChecker instance to break
circularity.
But here it is something totally different, used to lazily populate
imported and deserialized conformances, not parsed conformances.
The base mutability of storage is part of the signature, so be sure
to compute that during validation. Also, serialize it as part of
the storage declaration, and fix some places that synthesize
declarations to set it correctly.
The etymology of these terms isn't about race, but "black" = "blocked"
and "white" = "allowed" isn't really a good look these days. In most
cases we weren't using these terms particularly precisely anyway, so
the rephrasing is actually an improvement.
"Accessibility" has a different meaning for app developers, so we've
already deliberately excised it from our diagnostics in favor of terms
like "access control" and "access level". Do the same in the compiler
now that we aren't constantly pulling things into the release branch.
Rename AccessibilityAttr to AccessControlAttr and
SetterAccessibilityAttr to SetterAccessAttr, then track down the last
few uses of "accessibility" that don't have to do with
NSAccessibility. (I left the SourceKit XPC API alone because that's
supposed to be more stable.)
"Accessibility" has a different meaning for app developers, so we've
already deliberately excised it from our diagnostics in favor of terms
like "access control" and "access level". Do the same in the compiler
now that we aren't constantly pulling things into the release branch.
This commit changes the 'Accessibility' enum to be named 'AccessLevel'.
