To help support incremental adoption of the concurrency model, a number
of concurrency-related diagnostics are enabled only in "new" code that
takes advantage of concurrency features---async, @concurrent functions,
actors, etc. This warning flag opts into additional warnings that better
approximate the eventual concurrency model, and which will become
errors a future Swift version, allowing one to both experiment with
the full concurrency model and also properly prepare for it.
* [Sema]: Add Codable synthesis for enums with associated values
* Incorporate review feedback for enum Codable synthesis
* Implement enum specific versions of existing Codable tests
* Encode parameterless enum cases as
* Add test for overloaded case identifiers
* Align code generation with latest proposal revision
* Put enum codable derivation behind flag
* clang-format sources
* Address review feedback and fix tests
* Add diagnostic for conflicting parameter identifiers
* Restructure code after rebase
This patch removes the feature flag for @hasAsyncAlternative since it's
already protected by the experimental concurrency flag and will go in
with the concurrency features.
This fixes one of Doug's comments on
https://github.com/apple/swift/pull/36027.
This attribute marks a function has having an async alternative,
optionally providing the name of that function as a string. Intended to
be used to allow warnings when using a function with an async
alternative in an asynchronous context, to make the async refactorings
more accurate, and for documentation.
We're not quite ready to commit to the flow-sensitive check that would
allow a concurrent function to read from a mutable local capture so
long as the captured variable wasn't changed after the point of
capture. Put it behind a flag and implement the more restrictive rule
(no access to mutable local captures in concurrent code). We can relax
it later.
When referring to an actor-isolated declaration from outside of the
actor, ensure that the types involved conform to the `ConcurrentValue`
protocol. Otherwise, produce a diagnostic stating that it is unsafe to
pass such types across actors.
Apply the same rule to local captures within concurrent code.
Previously, the name of the entry point function was always main. Here,
a new frontend flag is added to enable an arbitrary name to be
specified.
rdar://58275758
This follows the design of how we handled this with
sil-verify-all. Specifically, the default behavior is to run only in asserts
builds, but one can use the two flags: enable-ast-verifier and
disable-ast-verifier to override the default behavior.
The reason why this is interesting is that this means that when compiling
normally, we will not run the verifier, so we won't have a perf hit. But we can
now ask the user to run with this flag (or in a future maybe a re-run in the
driver would do this for them), saving us time when screening bugs by avoiding
the need to build an asserts compiler to triage if the ASTVerifier would catch
the bug.
-enable-subst-sil-function-types-for-function-values
-enable-large-loadable-types
These defaulted to on, and there were no corresponding flags for
turning them off, so the flags had no effect.
Passing the frontend flag -Rmodule-loading makes the compiler emit
remarks with the path of every module loaded. The path for Swift modules
is either the swiftinterface file for modules built with library
evolution or the binary swiftmodule otherwise. The path for clangmodules
is always in the cache which could be improved as it may be less useful.
Here's an extract of the output for a simple SwiftUI app:
<unknown>:0: remark: loaded module from
/Users/xymus/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/2VJP7CNCGWRF0/SwiftShims-18ZF6992O9H75.pcm
<unknown>:0: remark: loaded module from
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.2.sdk/usr/lib/swift/Swift.swiftmodule/x86_64-apple-ios-simulator.swiftinterface
<unknown>:0: remark: loaded module from
/Users/xymus/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/2VJP7CNCGWRF0/os-1HVC6DNXVU37C.pcm
<unknown>:0: remark: loaded module from
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.2.sdk/usr/lib/swift/os.swiftmodule/x86_64-apple-ios-simulator.swiftinterface
<unknown>:0: remark: loaded module from
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator14.2.sdk/System/Library/Frameworks/SwiftUI.framework/Modules/SwiftUI.swiftmodule/x86_64-apple-ios-simulator.swiftinterface
Adds a new frontend option
"-experimental-allow-module-with-compiler-errors". If any compilation
errors occur while generating the .swiftmodule, this mode will skip SIL
entirely and only serialize the (likey invalid) AST.
This existence of this option during generation is serialized into the
resulting .swiftmodule. Errors found in deserialization are only allowed
if it is set.
Primarily intended for IDE requests (eg. indexing and code completion)
to ensure robust cross-module results, despite possible errors.
Resolves rdar://69815975
Adds a new flag "-experimental-skip-all-function-bodies" that skips
typechecking and SIL generation for all function bodies (where
possible).
`didSet` functions are still typechecked and have SIL generated as their
body is checked for the `oldValue` parameter, but are not serialized.
Parsing will generally be skipped as well, but this isn't necessarily
the case since other flags (eg. "-verify-syntax-tree") may force delayed
parsing off.
If a conformance is defined in an extension, we now look for
references to the conformance in types and expressions and
respect's the extension's availability (or deprecation, etc).
The conformance checker itself still needs to check conformance
availability of associated conformances and the like; that will
be a separate change.
Note that conformances defined on types don't require any
special handling, since they are as available as the
intersection of the conforming type and the protocol.
By default, we diagnose conformance availability violations
where the OS version is not sufficiently new as warnings, to
avoid breaking source compatibility. Stricter behavior where
these violations are diagnosed as errors is enabled by passing
the -enable-conformance-availability-errors flag. There are
test cases that run both with and without this flag. In the
future, we hope to make the stricter behavior the default,
since after all, violations here can result in link errors and
runtime crashes.
Uses of completely unavailable conformances are still always
diagnosed as errors, even when this flag is not passed in.
Progress on <rdar://problem/35158274>.
Introduce availability macros defined by a frontend flag.
This feature makes it possible to set the availability
versions at the moment of compilation instead of having
it hard coded in the sources. It can be used by projects
with a need to change the availability depending on the
compilation context while using the same sources.
The availability macro is defined with the `-define-availability` flag:
swift MyLib.swift -define-availability "_iOS8Aligned:macOS 10.10, iOS 8.0" ..
The macro can be used in code instead of a platform name and version:
@available(_iOS8Aligned, *)
public func foo() {}
rdar://problem/65612624
We need ClangImporterOptions to be persistent for several scenarios: (1)
when creating a sub-ASTContext to build Swift modules from interfaces; and
(2) when creating a new Clang instance to invoke Clang dependencies scanner.
This change is NFC.
In theory, we shouldn't need to deserialize @_implementationOnly dependencies. However,
potential decl recovery issues may bring down lldb if we insist on not importing these
dependencies, resulting in bad user experience as a result. This patch adds an internal
option to allow importing them and it should only be set by lldb and other tools.
rdar://65570721
Add `async` to the type system. `async` can be written as part of a
function type or function declaration, following the parameter list, e.g.,
func doSomeWork() async { ... }
`async` functions are distinct from non-`async` functions and there
are no conversions amongst them. At present, `async` functions do not
*do* anything, but this commit fully supports them as a distinct kind
of function throughout:
* Parsing of `async`
* AST representation of `async` in declarations and types
* Syntactic type representation of `async`
* (De-/re-)mangling of function types involving 'async'
* Runtime type representation and reconstruction of function types
involving `async`.
* Dynamic casting restrictions for `async` function types
* (De-)serialization of `async` function types
* Disabling overriding, witness matching, and conversions with
differing `async`
We have landed support for serialization Clang function types, but there is
still work to be done here.
Moreover, we should use a consistent style with `[(FIXME|TODO|NOTE): label]`,
instead of using different styles throughout the code.
