emission routines use the SGFContext passed in. To help with this and
to help the handshake, add a new "isInContext()" representation to
ManagedValue. This makes the code producing and consuming these more
explicit. NFC.
Swift SVN r12783
Lower types for SILDeclRefs from the interface types of their referents, dragging the old type along for the ride so we can still offer the context to clients that haven't been weaned off of it. Make SILFunctionType's interface types and generic signature independent arguments of its Derive the context types of SILFunctionType from the interface types, instead of the other way around. Do a bunch of annoying inseparable work in the AST and IRGen to accommodate the switchover.
Swift SVN r12536
In general, this forces SILGen and IRGen code that's grabbing
a declaration to state whether it's doing so to define it.
Change SIL serialization to serialize the linkage of functions
and global variables, which means also serializing declarations.
Change the deserializer to use this stored linkage, even when
only deserializing a declaration, and to call a callback to
inform the client that it has deserialized a new entity.
Take advantage of that callback in the linking pass to alter
the deserialized linkage as appropriate for the fact that we
imported the declaration. This computation should really take
advantage of the relationship between modules, but currently
it does not.
Swift SVN r12090
making LValue ManagedValues, and switch SILGenLValue to use
this form of managed value consistently for lvalues, instead of
using unmanaged values in some cases. NFC.
Swift SVN r11878
r11586 is still too weak to handle both a label and an abstraction change. Instead of trying to handle this case in the guts of the reabstraction machine, where it ends up breaking other things, pre-sanitize the witness and requirement types before feeding them in. This is gross, but the keyword overhaul will hopefully make this unnecessarily before long.
Swift SVN r11588
Gratuitously stripping the labels interferes with (T : U -> V) abstraction changes. Only strip the labels where strictly necessary for correct behavior for now.
Swift SVN r11586
In a case like:
protocol LabeledRequirement {
func method(x: Loadable)
}
struct UnlabeledWitness : LabeledRequirement {
func method(_: Loadable) {}
}
The original requirement type is represented as a labeled single-element TupleType, and the witness is represented as a scalar, but we want to disregard the label and consider the scalars in parallel. Do a pre-pass to strip single-element labels first before trying to destructure or indirect tuples.
Swift SVN r11580
Lower metatype types as @thin or @thick based on whether the type is static and whether the abstraction pattern allows for a thin metatype. Add a '@thick' attribute and require SIL metatypes to always be annotated with either '@thin' or '@thick' to distinguish them from unlowered metatypes.
Swift SVN r11525
Reuse John's abstraction thunking machinery in SILGenPoly to emit the abstraction change from a protocol requirement to a concrete witness. There are potentially two abstraction changes necessary; if a witness is generic, we need to reabstract again from the concrete substituted type of the witness to the generic witness function's original signature. This currently leads to a bunch of extra temporaries in cases where an argument or return gets unabstracted to a loadable value then reabstracted to a generic parameter, but optimizations should be able to clean this up. Protocol witnesses also have additional potential abstraction changes in their 'self' parameter: the 'self' parameter of the protocol requirement is always considered @inout, but class 'self' parameters are not; also, an operator requirement can be satisfied by a free function, in which case 'self' is discarded.
Also, fix a bug in return value thunking where, if the thunk could reuse its @out parameter as the @out parameter of the underlying function, we would not disable the cleanup we install on the result value, leading to the result getting overreleased.
Swift SVN r11245
