Split HashedCollections.swift.gyb into separate Set.swift and Dictionary.swift files, with some common parts going into Hashing.swift.
This is mostly a mechanical change, in preparation of unification of common parts between Set & Dictionary.
rdar://problem/34038727
In theory there could be a "fixed-layout" enum that's not exhaustive
but promises not to add any more cases with payloads, but we don't
need that distinction today.
(Note that @objc enums are still "fixed-layout" in the actual sense of
"having a compile-time known layout". There's just no special way to
spell that.)
Having a single initializer function lets us not set a randomized seed in deterministic mode, slightly simplifying the stdlib.
Set related stdlib properties to be always inlined.
- Hash seed randomization can now be disabled by defining the SWIFT_DETERMINISTIC_HASHING environment value with a value of "1".
- The random hash seed is now generated using arc4random, where available. On platforms where it isn't, don't construct std::random_device twice.
- _Hasher._secretKey is renamed _Hashing._seed, with no setter.
- _Hasher._isDeterministic is a new property exposing whether we're running with non-random hashes. (Set/Dictionary will need this information to decide if they're allowed to use per-instance seeding.)
Beyond switching hashing algorithms, this also enables per-execution hash seeds, fulfilling a long-standing prophecy in Hashable’s documentation.
To reduce the possibility of random test failures, StdlibUnittest’s TestSuite overrides the random hash seed on initialization.
rdar://problem/24109692
rdar://problem/35052153
Introduce _Hasher, representing an opaque hash compression function.
Add the method _hash(into:) as a Hashable requirement, decoupling the choice of hash function from Hashable's implementation. The default implementation of _hash(into:) has a default implementation that simply feeds hashValue to the hasher.
Add _hash(into:) implementations for the default integer types. Note that Int.hashValue does not return self anymore.
Add struct _LegacyHasher, emulating Swift 4.1 hashes in the new interface.
This patch adds powerpc64le Linux support. While the patch also adds
the matching powerpc64 bits, there are endian issues that need to be
sorted out.
The PowerPC LLVM changes for the swift ABI (eg returning three element
non-homogeneous aggregates) are still in the works, but a simple LLVM
fix to allow those aggregates results in swift passing all but 8
test cases.
The rule changes are as follows:
* All functions (introduced with the 'func' keyword) have argument
labels for arguments beyond the first, by default. Methods are no
longer special in this regard.
* The presence of a default argument no longer implies an argument
label.
The actual changes to the parser and printer are fairly simple; the
rest of the noise is updating the standard library, overlays, tests,
etc.
With the standard library, this change is intended to be API neutral:
I've added/removed #'s and _'s as appropriate to keep the user
interface the same. If we want to separately consider using argument
labels for more free functions now that the defaults in the language
have shifted, we can tackle that separately.
Fixes rdar://problem/17218256.
Swift SVN r27704
The standard library has grown significantly, and we need a new
directory structure that clearly reflects the role of the APIs, and
allows future growth.
See stdlib/{public,internal,private}/README.txt for more information.
Swift SVN r25876
