As per John, WritebackScope was always an unfortunate name. Generally these
scopes are meant for formal evaluations of inout parameters. The cases that I am
interested in generalizing them to be used for are borrows of the base of a
class that will then be used as an lvalue.
This also eliminates the out of line vector of lvalue writebacks.
rdar://29791263
SubstitutionList is going to be a more compact representation of
a SubstitutionMap, suitable for inline allocation inside another
object.
For now, it's just a typedef for ArrayRef<Substitution>.
There was only one place where we lowered AST types with a non-zero
uncurry level, in SILGenApply.cpp. Add a new overload of the
getSILFunctionType() method that takes an uncurry level. All the
other methods no longer have to thread it through.
Separate formal lowered types from SIL types.
The SIL type of an argument will depend on the SIL module's conventions.
The module conventions are determined by the SIL stage and LangOpts.
Almost NFC, but specialized manglings are broken incidentally as a result of
fixes to the way passes handle book-keeping of aruments. The mangler is fixed in
the subsequent commit.
Otherwise, NFC is intended, but quite possible do to rewriting the logic in many
places.
For this we need to store the linkage of the “original” method implementation in the vtable.
Otherwise DeadFunctionElimination thinks that the method implementation is not public but private (which is the linkage of the thunk).
The big part of this change is to extend SILVTable to store the linkage (+ serialization, printing, etc.).
fixes rdar://problem/29841635
Suppose we have a protocol requirement returning Self:
protocol Clonable {
func clone() -> Self
}
If we have a value 'x' of existential type 'Clonable',
the partial application 'x.clone' has formal type
'() -> Clonable'. However the actual type of the
method substitutes in an "opened" existential type
for 'Self'.
In order to implement the partial application we must
wrap the method in a thunk which 'erases' the opened
existential, so the thunk has type
<T : Clonable> (() -> T) -> () -> Clonable
The thunk is called with a substitution replacing 'T'
with the opened existential type.
Fixes <rdar://problem/21391055>.
Otherwise we might miss emitting a local type that's inside
unreachable code. Normally such a type cannot be found via
name lookup either, but IRGen will walk the list of local types
and try to emit a class with no SIL vtable, which will crash.
Fixes <https://bugs.swift.org/browse/SR-1924>.
Before this commit all code relating to handling arguments in SILBasicBlock had
somewhere in the name BB. This is redundant given that the class's name is
already SILBasicBlock. This commit drops those names.
Some examples:
getBBArg() => getArgument()
BBArgList => ArgumentList
bbarg_begin() => args_begin()
Keep in mind that these are approximations that will not impact correctness
since in all cases I ensured that the SIL will be the same after the
OwnershipModelEliminator has run. The cases that I was unsure of I commented
with SEMANTIC ARC TODO. Once we have the verifier any confusion that may have
occurred here will be dealt with.
rdar://28685236
When AnyHashable was added, SILGen gained support for lowering
AnyHashableErasureExpr, however we forgot to also add support
for AnyHashable parameter and result conversions to
FunctionConversionExpr.
Fixes <https://bugs.swift.org/browse/SR-2603>.
Previously IRGen was using a heuristic to assign the argument number
to the $error variable that was not generally correct for optimizaed
code. This patch inserts a debug_value instruction in SILGen and thus
assigns the ArgNo together with all the other function arguments. This
is more robust and faster than than the old heuristic.
<rdar://problem/28748323>
Sema produces a weird mix of requirement and witness archetypes when
it builds witness substitutions. Instead of hacking around this in
SILGen, just build new archetypes, since we already have to use an
ArchetypeBuilder to get the correct generic signature on the interface
type.
Then, we just have to map the witnessSubs provided by Sema to use our
new archetypes.
This unblocks some work on generic inlining.
Fixes <rdar://problem/28765006>.
The behaviour of ilist has changed in LLVM. It is no longer permissible to
dereference the `end()` value. Add a check to ensure that we do not
accidentally dereference the iterator.
When emitting an existential erasure to Error from an archetype, use
the _getEmbeddedNSError() witness. If it produces an NSError, erase
that; otherwise, go through the normal erasure path.
Of course, make NSError and CFError implement _getEmbeddedNSError() so
this kicks in for the obvious cases as well as the more obscure ones.
Fixes the rest of SR-1562 / rdar://problem/26370984.
Previously, if a generic type had a stored property with
a generic type and an initializer expression, we would
emit the expression directly in the body of each designated
initializer.
This is a problem if the designated initializer is defined
within an extension (even in the same source file), because
extensions have a different set of generic parameters and
archetypes.
Also, we've had bugs in the past where emitting an
expression multiple times didn't work properly. While these
might currently all be fixed, this is a tricky case to test
and it would be best to avoid it.
Fix both problems by emitting the initializer expression
inside its own function at the SIL level, and call the
initializer function from each designated initializer.
I'm using the existing 'variable initializer' mangling for this;
it doesn't seem to be used for anything else right now.
Currently, the default memberwise initializer does not use
this, because the machinery for emitting it is somewhat
duplicated and separate from the initializer expressions in
user-defined constructors. I'll clean this up in an upcoming
patch.
Fixes <https://bugs.swift.org/browse/SR-488>.
String literal expressions, as well as the magic literals #file and
tuple value that is then fed into one or two call expressions. For
string literals, that tuple value was implicitly splatted, breaking
AST invariants.
Instead, keep string literals and these magic literals that produce a
string as a single expression node, but store the declarations that
will be used to transform the raw literal into the complete
literal. SILGen will form the appropriate calls. This representation
is far simpler---the AST no longer has a bunch of implicit nodes---and
doesn't break AST invariants.
If a `T?` is converted to `Any?` to pass to a `_Nullable id` interface in ObjC, avoid the intermediate conversion and bridge straight to AnyObject? too.
Till now there was no way in SIL to explicitly express a dependency of an instruction on any opened archetypes used by it. This was a cause of many errors and correctness issues. In many cases the code was moved around without taking into account these dependencies, which resulted in breaking the invariant that any uses of an opened archetype should be dominated by the definition of this archetype.
This patch does the following:
- Map opened archetypes to the instructions defining them, i.e. to open_existential instructions.
- Introduce a helper class SILOpenedArchetypesTracker for creating and maintaining such mappings.
- Introduce a helper class SILOpenedArchetypesState for providing a read-only API for looking up available opened archetypes.
- Each SIL instruction which uses an opened archetype as a type gets an additional opened archetype operand representing a dependency of the instruction on this archetype. These opened archetypes operands are an in-memory representation. They are not serialized. Instead, they are re-constructed when reading binary or textual SIL files.
- SILVerifier was extended to conduct more thorough checks related to the usage of opened archetypes.
Till now there was no way in SIL to explicitly express a dependency of an instruction on any opened archetypes used by it. This was a cause of many errors and correctness issues. In many cases the code was moved around without taking into account these dependencies, which resulted in breaking the invariant that any uses of an opened archetype should be dominated by the definition of this archetype.
This patch does the following:
- Map opened archetypes to the instructions defining them, i.e. to open_existential instructions.
- Introduce a helper class SILOpenedArchetypesTracker for creating and maintaining such mappings.
- Introduce a helper class SILOpenedArchetypesState for providing a read-only API for looking up available opened archetypes.
- Each SIL instruction which uses an opened archetype as a type gets an additional opened archetype operand representing a dependency of the instruction on this archetype. These opened archetypes operands are an in-memory representation. They are not serialized. Instead, they are re-constructed when reading binary or textual SIL files.
- SILVerifier was extended to conduct more thorough checks related to the usage of opened archetypes.
Till now there was no way in SIL to explicitly express a dependency of an instruction on any opened archetypes used by it. This was a cause of many errors and correctness issues. In many cases the code was moved around without taking into account these dependencies, which resulted in breaking the invariant that any uses of an opened archetype should be dominated by the definition of this archetype.
This patch does the following:
- Map opened archetypes to the instructions defining them, i.e. to open_existential instructions.
- Introduce a helper class SILOpenedArchetypesTracker for creating and maintaining such mappings.
- Introduce a helper class SILOpenedArchetypesState for providing a read-only API for looking up available opened archetypes.
- Each SIL instruction which uses an opened archetype as a type gets an additional opened archetype operand representing a dependency of the instruction on this archetype. These opened archetypes operands are an in-memory representation. They are not serialized. Instead, they are re-constructed when reading binary or textual SIL files.
- SILVerifier was extended to conduct more thorough checks related to the usage of opened archetypes.
We now have enough machinery in place to reference local generic
functions which have captures, to get a value of function type
that can be passed around.
Generic local functions still cannot be directly called from
function call expressions, since those go down a different
path in SILGenApply.cpp -- the next patch will add support for
this case.
Outside of constructors and destructors, it's wasteful to generate
coverage mappings for implicitly-generated regions. Get rid of these
mappings and any counter increments associated with them.
Implements SE-0055: https://github.com/apple/swift-evolution/blob/master/proposals/0055-optional-unsafe-pointers.md
- Add NULL as an extra inhabitant of Builtin.RawPointer (currently
hardcoded to 0 rather than being target-dependent).
- Import non-object pointers as Optional/IUO when nullable/null_unspecified
(like everything else).
- Change the type checker's *-to-pointer conversions to handle a layer of
optional.
- Use 'AutoreleasingUnsafeMutablePointer<NSError?>?' as the type of error
parameters exported to Objective-C.
- Drop NilLiteralConvertible conformance for all pointer types.
- Update the standard library and then all the tests.
I've decided to leave this commit only updating existing tests; any new
tests will come in the following commits. (That may mean some additional
implementation work to follow.)
The other major piece that's missing here is migration. I'm hoping we get
a lot of that with Swift 1.1's work for optional object references, but
I still need to investigate.
Don't hardcode linkage of default implementations of materializeForSet
to public, addressing a FIXME.
This will allow us to emit default witness thunks for requirements of
internal protocols, too.
This is used when materializing an LValue to share state between
the read and write phases of the access, replacing the 'temporary'
and 'extraInfo' parameters that were previously being passed around.
It adds two new fields, origSelfType and genericSig, which will be
used in an upcoming patch to actually apply the callback with the
current generic signature.
This will finally allow us to make use of materializeForSet
implementations in protocol extensions, which is a prerequisite
for enabling resilient default implementations of property and
subscript requirements.
Previously we would emit two types of MaterializeForSet implementations
in SILGen:
- materializeForSet for a concrete storage declaration
- materializeForSet witness thunk in a conformance
This refactoring decouples the code from taking a conformance, which is
needed for two new types of materializeForSet that we need:
- materializeForSet witness thunk in a default witness table -- this is
necessary in order to be able to resiliently add storage requirements
with default implementations to protocols
- materializeForSet vtable thunk -- this is necessary to fix a missing
re-abstraction case with overriding storage in a subclass
This patch brings us closer to implementing these two. For default
implementations, we still have an issue in that the materializeForSet
has a different "generic signature abstraction pattern" in concrete
and default witnesses, so default and concrete witnesses for
materializeForSet are currently ABI-incompatible because the type
metadata for the storage is passed differently to the callback.
