An objcImpl bug previously caused `@_hasStorage` to be emitted inside some extensions in module interfaces. An earlier commit in this PR created an error for this, but for backwards compatibility, it would actually be better to simply ignore the attribute in module interfaces. Modify TypeCheckStorage to emit a warning, not an error, in this situation.
Additionally, modify the module interface loader to show warnings when you verify a module interface, but not for other module interface uses (like compiling or importing one). The assumption here is that if you’re verifying a module interface, you’re either the author of the module that created it or you’re investigating a problem with it, and in either case you’d like to be told about minor defects in case they’re related.
Fixes rdar://144811653 thoroughly.
A bug in `@objc @implementation` is causing incorrect `@_hasStorage` attributes to be printed into module interfaces. As an initial step towards fixing this, diagnose bad `@_hasStorage` attributes and treat them as computed properties so that these malformed interfaces don’t cause compiler crashes.
Partially fixes rdar://144811653.
Update the logic to correctly handle replacement ranges, and re-enable
the assertion. For now, carve out an exception for attributes on
extensions, I'll try and tackle those in a follow-up.
Certain dynamic casts cannot work safely with isolated conformances,
regardless of what executor the code runs on. For such cases, reject
all attempts to conform to the type.
When performing a dynamic cast to an existential type that satisfies
(Metatype)Sendable, it is unsafe to allow isolated conformances of any
kind to satisfy protocol requirements for the existential. Identify
these cases and mark the corresponding cast instructions with a new flag,
`[prohibit_isolated_conformances]` that will be used to indicate to the
runtime that isolated conformances need to be rejected.
Move to a recursive lock inline in the Task. This avoids the need to allocate a lock record and simplifies the code somewhat.
Change Task's OpaquePrivateStorage to compute its size at build time based on the sizes of its components, rather than having it be a fixed size. It appears that the fixed size was intended to be part of the ABI, but that didn't happen and we're free to change this size. We need to expand it slightly when using pthread_mutex as the recursive lock, as pthread_mutex is pretty big. Other recursive locks allow it to shrink slightly.
We don't have a recursive mutex in our Threading support code, so add a RecursiveMutex type.
rdar://113898653
This commit compares the attributes on the decl inside the `@abi` attribute to those in the decl it’s attached to, diagnosing ABI-incompatible differences. It also rejects many attributes that don’t need to be specified in the `@abi` attribute, such as ObjC-ness, access control, or ABI-neutral traits like `@discardableResult`, so developers know to remove them.
This PR adds a set of DeclAttr.def flags for specifying how a given attribute interacts with `@abi`, and declares a behavior for each existing attribute. Future attributes will be *required* to declare an `@abi` behavior lest they fail a static assert.
Note that the behavior is not actually enforced in this commit—it is merely specified here.
Adds a new method to `DeclAttribute` which can compare two attributes and see if they would be “equivalent” in light of the given decl. “Equivalent” here means that they would have the same effect on the declaration; for instance, two attrs with different source locations can be equivalent, and two attributes with the same arguments in a different order are equivalent if the ordering of those argumetns is not semantically equivalent.
This capability is not yet used in this commit, but in a future commit `@abi` will check if certain attributes are equivalent or not.
This commit compares the decl inside the `@abi` attribute to the decl it’s attached to, diagnosing ABI-incompatible differences. It does not yet cover attributes, which are a large undertaking.
Correct an issue with `ImplementsAttr` that would come up if you ever tried to clone an attribute that had been deserialized.
No tests because there’s nothing in the compiler yet that might actually do so.
I am doing this in preparation for adding the ability to represent in the SIL
type system that a function is global actor isolated. Since we have isolated
parameters in SIL, we do not need to represent parameter, nonisolated, or
nonisolated caller in the type system. So this should be sufficient for our
purposes.
I am adding this since I need to ensure that we mangle into thunks that convert
execution(caller) functions to `global actor` functions what the global actor
is. Otherwise, we cannot tell the difference in between such a thunk and a thunk
that converts execution(caller) to execution(concurrent).
