Rework Sendable checking to be completely based on "missing"
conformances, so that we can individually diagnose missing Sendable
conformances based on both the module in which the conformance check
happened as well as where the type was declared. The basic rules here
are to only diagnose if either the module where the non-Sendable type
was declared or the module where it was checked was compiled with a
mode that consistently diagnoses `Sendable`, either by virtue of
being Swift 6 or because `-warn-concurrency` was provided on the
command line. And have that diagnostic be an error in Swift 6 or
warning in Swift 5.x.
There is much tuning to be done here.
Many clients of the conformance lookup operations would prefer to get
an invalid conformance (== there is no conformance) rather than a
missing conformance. Parameterize the conformance lookup operations so
that most callers won't see missing conformances, by filtering them
out at the end. Opt-in those callers that do want to see missing
conformances so they can be diagnosed.
Introduce a second level of standard substitutions to the mangling,
all of the form `Sc<character>`, and use it to provide standard
substitutions for most of the _Concurrency types.
This is a precursor to rdar://78269642 and a good mangling-size
optimization in its own right.
If the `-static` option is specified, store that in the generated
swiftmodule file. When de-serializing, recover this information in the
representative SILModule.
This will be used for code generation on Windows. It is the missing
piece to allow static linking to function properly. It additionally
opens the path to additional optimization on ELF-ish targets - GOT, PLT
references can be avoided when the linked module is known to be static.
Co-authored by: Saleem Abdulrasool <compnerd@compnerd.org>
This allows library authors to pass down a project version number so that library users can conditionally
import that library based on the available version in the search paths.
Needed for rdar://73992299
Cross-module incremental builds require a stable source of fingerprint
information for iterable decl contexts. This is provided by the
incremental frontends when they produce partial swift module files.
Embedded in these files is a table of fingerprints, which are consumed
by merge-modules to construct a module-wide dependency graph that is
then serialized into the final merged swift module file. Unfortunately,
the implementation here iterated through the files in the module and
asked for the first fingerprint that would load for a particular
iterable decl context. If (more likely, when) the DeclID for that
serialized iterable decl context collided with another DeclID in the
wrong file, we would load that fingerprint instead.
Locate up to the module-scope context for an iterable decl context and
only load the fingerprint from there. This ensures that the fingerprints
in the partial modules matches the fingerprints in the merged modules.
rdar://77005039
Intro the concept of library access or distribution level to identify
layers of libraries and report public imports of private libraries from
public ones.
rdar://62934005
Using `-module-abi-name` for the `_Concurrency` module breaks older
Swift compilers. Instead, hard-code that "Swift" is the ABI name of the
"_Concurrency" module in the compiler to dodge the problem.
Introduce a new compiler flag `-module-abi-name <name>` that uses the
given name as the ABI name for the module (rather than the module's
name in source code). The ABI name impacts name mangling and metadata.
If a function uses a type imported as implementationOnly (or similar), it cannot be serialized.
I added a new API in ModuleDecl (canBeUsedForCrossModuleOptimization), which performs this check.
rdar://72864719
When importing Clang types.
This is not an option with Explicit Module Builds. If the module being built does not (directly or transitively) depend on `Foundation`, then attempting to load it will produce an error because Implicit module loading is no longer allowed..
This change addresses a small number of cases where ClangImporter relies on being able to load `Foundation` on-demand:
- When importing a single Decl from a clang module, we check whether it has certain conformances by checking all extensions of the NominalTypeDecl of the Decl in question, to see if any of the extensions contain the conformance we are looking for, but we only check extensions whose parent module is either the original module of the NominalTypeDecl or the overlay module of the NominalTypeDecl or Foundation. It seems that we do not need to actually import `Foundation` here, just checking the module Identifier should be sufficient.
- In `maybeImportNSErrorOutParameter`, change the behavior to have an exit condition based on whether `Foundation` can be imported, before attempting to load it.
- When checking whether or not we are allowed to bridge an Objective-C type, it also looks sufficient the query whether or not `Foundation` *can* be imported, without loading it.
```
@_specialize(exported: true, spi: SPIGroupName, where T == Int)
public func myFunc() { }
```
The specialized entry point is only visible for modules that import
using `_spi(SPIGroupName) import ModuleDefiningMyFunc `.
rdar://64993425
To help consolidate our various types describing imports, this commit moves the following types and methods to Import.h:
* ImplicitImports
* ImplicitStdlibKind
* ImplicitImportInfo
* ModuleDecl::ImportedModule
* ModuleDecl::OrderImportedModules (as ImportedModule::Order)
* ModuleDecl::removeDuplicateImports() (as ImportedModule::removeDuplicates())
* SourceFile::ImportFlags
* SourceFile::ImportOptions
* SourceFile::ImportedModuleDesc
This commit is large and intentionally kept mechanical—nothing interesting to see here.
The lack of clarity manifested as unexpected behavior when using
getImportedModules to create the module import graph. The new behavior
makes SPI-ness and Shadowing-ness behave similarly in terms of
filtering. We also check if a filter is well-formed to avoid
accidental empty import lists.
The parameter here was derived from the CompilerInvocation-level parsing bits, which doesn't make any sense. This state is going away soon, so drop the parameter.
Extensions to implementation-only types are accepted at type-checking
only if they don't define any public members. However if they declared a
conformance to a public type they were also printed in the
swiftinterface, making it unparsable because of an unknown type.
Still accept such extensions but don't print them.
rdar://problem/67516588
Remove the `PrimarySourceFiles` vector from the
frontend and replace it with a request on
ModuleDecl that retrieves the primary files for
the main module.
This is in preparation for having
`CompilerInstance::getMainModule` automatically
populate the main module with files when queried.
Start asserting in `ModuleDecl::getFiles`
that the module is either non-empty or has
failed to load. This ensures that module
loading doesn't attempt to query the module's
files until the ModuleFile has been installed.
Rather than adding a ModuleFile to a parent module
and then removing it afterwards if it fails to
load, let's wait until we've loaded the file before
deciding to add it to the parent module. This then
allows us to get rid of `ModuleDecl::removeFile`.
In addition, push down the calls to `addFile` into
the callers of `loadAST` in preparation for
`addFile` being replaced with a one-time-only call
to a `setFiles` method.
Using a SetVector fixes an issue where many source files imported the
same SPI group from the same module, the emitted private textual
interfaces superfluously repeated the `@_spi` attribute on the import.
rdar://problem/63681845
