rdar://132501359
PowerOf2Ceil is not the correct function to use, because we end up with an empty mask if there is only one value stored in the extra tag bits
rdar://129627898
When casting the projectedBits to Int8, we accidetnally passed the base addr instead of the projectedBits. This was causing the wrong bits to be read.
rdar://129627898
LLVM expects integer types of fractional byte sizes to have been written as those types as well, so it expects all unused bytes to be 0.
Since we are using the unused extra tag bits to store tags of outer enums, that assumption does not hold here. In regular witnesses,
the outer enum would mask out those bytes before checking the tag of the inner enum. In CVW we can't do that, so we have to apply the
mask ourselves. To guarantee the mask does not get optimized out, we have to use full bytes instead of fractionals.
rdar://127279770
When an imported C type is over or under aligned, we did not use the alignment of the type, but computed the maximum alignment of its components, causing alignment issues in compact value witnesses.
When an @objc @implementation class requires the use of `ClassMetadataStrategy::Update` because some of its stored properties do not have fixed sizes, we adjust the direct field offsets during class realization by emitting a custom metadata update function which calls a new entry point in the Swift runtime. That entry point adjusts field offsets like `swift_updateClassMetadata2()`, but it only assumes that the class has Objective-C metadata, not Swift metadata.
This commit introduces an alternative mechanism which does the same thing without using any Swift-only metadata. It’s a rough implementation with important limitations:
• We’re currently using the field offset vector, which means that field offsets are being emitted into @objc @implementation classes; these will be removed.
• The new Swift runtime entry point duplicates a lot of `swift_updateClassMetadata2()`’s implementation; it will be refactored into something much smaller and more compact.
• Availability bounds for this feature have not yet been implemented.
Future commits in this PR will correct these issues.
rdar://126954341
C types don't have separate size and stride, but in type layouts we always computed the size as if they did. This could cause wrong offsets in compact value witnesses
* [Runtime] Fix CVW for genreic single payload enums with no extra inhabitants
rdar://126728925
When the payload of a generic SPE did not have any extra inhabitants, we erroneously always treated it as the no payload case.
Additionally the offset and skip values were improperly computed.
* Fixed FileCheck string
This change introduces a new compilation target platform to the Swift compiler - visionOS.
- Changes to the compiler build infrastrucuture to support building compiler-adjacent artifacts and test suites for the new target.
- Addition of the new platform kind definition.
- Support for the new platform in language constructs such as compile-time availability annotations or runtime OS version queries.
- Utilities to read out Darwin platform SDK info containing platform mapping data.
- Utilities to support re-mapping availability annotations from iOS to visionOS (e.g. 'updateIntroducedPlatformForFallback', 'updateDeprecatedPlatformForFallback', 'updateObsoletedPlatformForFallback').
- Additional tests exercising platform-specific availability handling and availability re-mapping fallback code-path.
- Changes to existing test suite to accomodate the new platform.
Fix overflow detection on unowned refcounts so that we create a side table when incrementing from 126. Implement strong refcount overflow to the side table.
The unowned refcount is never supposed to be 127, because that (sometimes) represents the immortal refcount. We attempt to detect that by checking newValue == Offsets::UnownedRefCountMask, but the mask is shifted so that condition is never true. We managed to hit the side table case when incrementing from 127, because it looks like the immortal case. But that broke when we fixed immortal side table initialization in b41079a8f54ae2d61c68cdda46c74232084af020. With that change, we now create an immortal side table when overflowing the unowned refcount, then try to increment the unowned refcount in that immortal side table, which traps.
rdar://123788910
rdar://121868127
In compact value witnesses we need to mask the extra tag bits in case they are used to store tag bits of outer enums, so we only read the ones we are interested in.
rdar://119792426
There are a few issues with wrong assumptions around extra inhabitants that cause tags to not be identified properly in some cases. Until a proper fix is identified, we emit tag functions instead.
rdar://118606044
The initWithTakeTable accidentally referenced bridgeRetain instead of copyingInitWithTake, which caused a leak when an object containing a bridge reference was also not bitwise takable.
An immutable noncopyable capture borrows the captured value in-place and can't do anything
to modify it, and the may_assign_but_not_consume checking behaves badly with some code patterns
generated for resilient types when `self` is captured during a deinit. This change allows for
more accurate checking and fixes rdar://118427997.
When a address-only noncopyable value is dead-def'ed by an indirect return from a `try_apply`,
the cleanup should be inserted on the normal return successor block. Fixes rdar://118255228.
* [Runtime] Use threaded code in compact value witness runtime
These changed reduce branching and yield performance improvements of up to 10% for some cases.
* Fix offset in handleRefCountsInitWithTake
By using a specialize function, we only call through the witness table and fetch the layout string once for the whoe buffer, instead of once per element.
rdar://115013153
For special enum cases, e.g. effectively optional references, the layout string will be the same as the payload, because we don't have to check for the particular case. For those cases we have to use the regular witnesses, which should be shared among all those cases.
`module.map` as a module map name has been discouraged since 2014, and
Clang will soon warn on its usage. This patch renames all instances of
`module.map` in the Swift tests to `module.modulemap` in preparation
for this change to Clang.
rdar://106123303
_swift_addRefCountStringForMetatype and _swift_refCountBytesForMetatype diverged in the code that determines whether a type is a reference, causing the size number of ref count bytes to differ from the actually used bytes. This can cause early termination of the runtime interpreter functions, which in turn causes unbalanced reference counts.
rdar://112474091
* [IRGen+Runtime] Layout string getEnumTag for fixed size enums subset
getEnumTag impl for layout strings of fixed sized enums that use a function to fetch the enum tag
* Fix potential UB in IRGen
* [IRGen] Use EnumImplStrategy to generate getEnumTag function for layout strings
rdar://110794898
The implementation in TypeLayout seems to have a bug causing wrong tags to be returned on 32 bit systems.
* Don't use unsupported types in tests
