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.
While it is very convenient to default the ExtInfo state when creating
new function types, it also make the intent unclear to those looking to
extend ExtInfo state. For example, did a given call site intend to have
the default ExtInfo state or does it just happen to work? This matters a
lot because function types are regularly unpacked and rebuilt and it's
really easy to accidentally drop ExtInfo state.
By changing the ExtInfo state to an optional, we can track when it is
actually needed.
Import APIs with the `swift_async_error` attribute in `zero_argument` or `nonzero_argument`
modes by checking the corresponding boolean argument to indicate the error status, instead of
treating it as part of the result tuple. rdar://70594666
Plumb generic signatures through the codegen for invoking foreign APIs as async, so that we
correctly handle APIs declared on ObjC lightweight generic classes. rdar://74361267
Add the following new mangling rules.
```
global ::= from-type to-type 'TJO' AUTODIFF-FUNCTION-KIND // autodiff self-reordering reabstraction thunk
global ::= from-type 'TJS' AUTODIFF-FUNCTION-KIND INDEX-SUBSET 'p' INDEX-SUBSET 'r' INDEX-SUBSET 'P' // autodiff linear map subset parameters thunk
global ::= global to-type 'TJS' AUTODIFF-FUNCTION-KIND INDEX-SUBSET 'p' INDEX-SUBSET 'r' INDEX-SUBSET 'P' // autodiff derivative function subset parameters thunk
```
Example:
```console
$s13TangentVector16_Differentiation14DifferentiablePQzAaDQy_SdAFIegnnnr_TJSdSSSpSrSUSP ---> autodiff subset parameters thunk for differential from @escaping @callee_guaranteed (@in_guaranteed A._Differentiation.Differentiable.TangentVector, @in_guaranteed B._Differentiation.Differentiable.TangentVector, @in_guaranteed Swift.Double) -> (@out B._Differentiation.Differentiable.TangentVector) with respect to parameters {0, 1, 2} and results {0} to parameters {0, 2}
$sS2f8mangling3FooV13TangentVectorVIegydd_SfAESfIegydd_TJOp ---> autodiff self-reordering reabstraction thunk for pullback from @escaping @callee_guaranteed (@unowned Swift.Float) -> (@unowned Swift.Float, @unowned mangling.Foo.TangentVector) to @escaping @callee_guaranteed (@unowned Swift.Float) -> (@unowned mangling.Foo.TangentVector, @unowned Swift.Float)
```
Resolves rdar://72666310 / SR-13508.
Also fix a bug in `AutoDiffFunction` mangling where the original may be a global that contains more than 1 node (rdar://74151229 / SR-14106).
Compiler:
- Add `Forward` and `Reverse` to `DifferentiabilityKind`.
- Expand `DifferentiabilityMask` in `ExtInfo` to 3 bits so that it now holds all 4 cases of `DifferentiabilityKind`.
- Parse `@differentiable(reverse)` and `@differentiable(_forward)` declaration attributes and type attributes.
- Emit a warning for `@differentiable` without `reverse`.
- Emit an error for `@differentiable(_forward)`.
- Rename `@differentiable(linear)` to `@differentiable(_linear)`.
- Make `@differentiable(reverse)` type lowering go through today's `@differentiable` code path. We will specialize it to reverse-mode in a follow-up patch.
ABI:
- Add `Forward` and `Reverse` to `FunctionMetadataDifferentiabilityKind`.
- Extend `TargetFunctionTypeFlags` by 1 bit to store the highest bit of differentiability kind (linear). Note that there is a 2-bit gap in `DifferentiabilityMask` which is reserved for `AsyncMask` and `ConcurrentMask`; `AsyncMask` is ABI-stable so we cannot change that.
_Differentiation module:
- Replace all occurrences of `@differentiable` with `@differentiable(reverse)`.
- Delete `_transpose(of:)`.
Resolves rdar://69980056.
Add @concurrent to SIL function types, mirroring what's available on
AST function types. @concurrent function types will have by-value
capture semantics.
Introduce `@concurrent` attribute on function types, including:
* Parsing as a type attribute
* (De-/re-/)mangling for concurrent function types
* Implicit conversion from @concurrent to non-@concurrent
- (De-)serialization for concurrent function types
- AST printing and dumping support
The generic signature isn't used for a whole lot, so this all mostly
worked before; the test case I have hits the code path for mangling
a retroactive conformance.
Fixes <https://bugs.swift.org/browse/SR-14016> / <rdar://problem/72865083>.
- `Mangle::ASTMangler::mangleAutoDiffDerivativeFunction()` and `Mangle::ASTMangler::mangleAutoDiffLinearMap()` accept original function declarations and return a mangled name for a derivative function or linear map. This is called during SILGen and TBDGen.
- `Mangle::DifferentiationMangler` handles differentiation function mangling in the differentiation transform. This part is necessary because we need to perform demangling on the original function and remangle it as part of a differentiation function mangling tree in order to get the correct substitutions in the mangled derivative generic signature.
A mangled differentiation function name includes:
- The original function.
- The differentiation function kind.
- The parameter indices for differentiation.
- The result indices for differentiation.
- The derivative generic signature.
Since these types have an implicit stored property, this requires
adding an abstraction over fields to IRGen, at least throughout
the class code. In some ways I think this significantly improves
the code, especially in how we approach missing members.
Fixes rdar://72202671.
of adding a property.
This better matches what the actual implementation expects,
and it avoids some possibilities of weird mismatches. However,
it also requires special-case initialization, destruction, and
dynamic-layout support, none of which I've added yet.
In order to get NSObject default actor subclasses to use Swift
refcounting (and thus avoid the need for the default actor runtime
to generally use ObjC refcounting), I've had to introduce a
SwiftNativeNSObject which we substitute as the superclass when
inheriting directly from NSObject. This is something we could
do in all NSObject subclasses; for now, I'm just doing it in
actors, although it's all actors and not just default actors.
We are not yet taking advantage of our special knowledge of this
class anywhere except the reference-counting code.
I went around in circles exploring a number of alternatives for
doing this; at one point I basically had a completely parallel
"ForImplementation" superclass query. That proved to be a lot
of added complexity and created more problems than it solved.
We also don't *really* get any benefit from this subclassing
because there still wouldn't be a consistent superclass for all
actors. So instead it's very ad-hoc.
We don't introduce a new mangling here.
To distinguish the names of the original asyncHandler function and it's generated "body-function", we just mangle the body-function with an async attribute, i.e. as if it was declared as async.
This change is mostly to pass information to the ASTMangler to mangle a not async function as "async".
In derivatives of loops, no longer allocate boxes for indirect case payloads. Instead, use a custom pullback context in the runtime which contains a bump-pointer allocator.
When a function contains a differentiated loop, the closure context is a `Builtin.NativeObject`, which contains a `swift::AutoDiffLinearMapContext` and a tail-allocated top-level linear map struct (which represents the linear map struct that was previously directly partial-applied into the pullback). In branching trace enums, the payloads of previously indirect cases will be allocated by `swift::AutoDiffLinearMapContext::allocate` and stored as a `Builtin.RawPointer`.
To manage code size in user binaries, we want to be able to implement common completion handler signatures in
the Swift runtime once. Using a different mangling for these lets us add new ones without clobbering symbols in
existing binaries.
Immediately before invoking the ObjC API, get the current continuation, capture it into a block to
pass as the completion handler, and then await the continuation, whose resume/error successors
serve as the semantic return/throw result of the call. This should complete the caller-side part
of SILGen; the completion handler block implementation is however still only a stub.
Instead of using `UnresolvedType` as a placeholder for a type hole,
let's switch over to a dedicated "rich" `HoleType` which is capable
of storing "originator" type - type variable or dependent member
type which couldn't be resolved.
This makes it easier for the solver to determine origins of
a hole which helps to diagnose certain problems better. It also
helps code completion to locate "expected type" of the context
even when it couldn't be completely resolved.
This is a roll-forward of https://github.com/apple/swift/pull/32950, with explicit c++17 version removed from tests. This is not needed since C++17 is the default anyway.
--
In this PR we teach `ClangImporter` to import typedef statements with template instantiation as its underlying type.
```c++
template<class T>
struct MagicWrapper {
T t;
};
struct MagicNumber {};
typedef MagicWrapper<MagicNumber> WrappedMagicNumber;
```
will be made available in Swift as if `WrappedMagicNumber` is a regular struct.
In C++, multiple distinct typedeffed instantiations resolve to the same canonical type. We implement this by creating a hidden intermediate struct that typedef aliasses.
The struct is named as `__CxxTemplateInst` plus Itanium mangled type of the instantiation. For the example above the name of the hidden struct is `__CxxTemplateInst12MagicWrapperI11MagicNumberE`. Double underscore (denoting a reserved C++ identifier) is used to discourage direct usage. We chose Itanium mangling scheme because it produces valid Swift identifiers and covers all C++ edge cases.
Imported module interface of the example above:
```swift
struct __CxxTemplateInst12MagicWrapperI11MagicNumberE {
var t: MagicNumber
}
struct MagicNumber {}
typealias WrappedMagicNumber = __CxxTemplateInst12MagicWrapperI11MagicNumberE
```
We modified the `SwiftLookupTable` logic to show hidden structs in `swift_ide_test` for convenience.
Co-authored-by: Rosica Dejanovska <rosica@google.com>
Co-authored-by: Dmitri Gribenko <gribozavr@gmail.com>
Co-authored-by: Robert Widmann <devteam.codafi@gmail.com>
In this PR we teach `ClangImporter` to import typedef statements with template instantiation as its underlying type.
```c++
template<class T>
struct MagicWrapper {
T t;
};
struct MagicNumber {};
typedef MagicWrapper<MagicNumber> WrappedMagicNumber;
```
will be made available in Swift as if `WrappedMagicNumber` is a regular struct.
In C++, multiple distinct typedeffed instantiations resolve to the same canonical type. We implement this by creating a hidden intermediate struct that typedef aliasses.
The struct is named as `__CxxTemplateInst` plus Itanium mangled type of the instantiation. For the example above the name of the hidden struct is `__CxxTemplateInst12MagicWrapperI11MagicNumberE`. Double underscore (denoting a reserved C++ identifier) is used to discourage direct usage. We chose Itanium mangling scheme because it produces valid Swift identifiers and covers all C++ edge cases.
Imported module interface of the example above:
```swift
struct __CxxTemplateInst12MagicWrapperI11MagicNumberE {
var t: MagicNumber
}
struct MagicNumber {}
typealias WrappedMagicNumber = __CxxTemplateInst12MagicWrapperI11MagicNumberE
```
We modified the `SwiftLookupTable` logic to show hidden structs in `swift_ide_test` for convenience.
Resolves https://bugs.swift.org/browse/SR-12591.
Co-authored-by: Rosica Dejanovska <rosica@google.com>
Co-authored-by: Dmitri Gribenko <gribozavr@gmail.com>
Co-authored-by: Robert Widmann <devteam.codafi@gmail.com>
