Language features like erasing concrete metatype
values are also left for the future. Still, baby steps.
The singleton ordinary metatype for existential types
is still potentially useful; we allow it to be written
as P.Protocol.
I've been somewhat cavalier in making code accept
AnyMetatypeType instead of a more specific type, and
it's likely that a number of these places can and
should be more restrictive.
When T is an existential type, parse T.Type as an
ExistentialMetatypeType instead of a MetatypeType.
An existential metatype is the formal type
\exists t:P . (t.Type)
whereas the ordinary metatype is the formal type
(\exists t:P . t).Type
which is singleton. Our inability to express that
difference was leading to an ever-increasing cascade
of hacks where information is shadily passed behind
the scenes in order to make various operations with
static members of protocols work correctly.
This patch takes the first step towards fixing that
by splitting out existential metatypes and giving
them a pointer representation. Eventually, we will
need them to be able to carry protocol witness tables
Swift SVN r15716
We can just get it from the instance type, if the instance type has been fully initialized, which is the case except during parsing of type decls when the decls' own types are being formed.
Swift SVN r15598
(These changes also address the type-check aspects of rdar://problem/16369105, but there are still some SIL generation issues that I need to work through before I can call that work done.)
Swift SVN r15337
In a couple of cases, we weren't properly extracting the correct archetype type from generic type parameters. This was causing various crashes and strange errors throughout the system. (See rdar://problem/16296421, rdar://problem/16273217, rdar://problem/16329242)
Swift SVN r15213
Let ArchetypeType nested types and PotentialArchetypes be bound to concrete types in addition to archetypes. Constraints to outer context archetypes still suffer type-checker issues, but constraints to true concrete types should work now.
Swift SVN r14832
Resolve selector references using compound name lookup, pushing DeclNames a bit deeper through the type-checker and diagnostics as necessary.
Swift SVN r14791
Teach name lookup to find complete object initializers in its
superclass when the current class overrides all of the subobject
initializers of its direct superclass.
Clean up the implicit declaration of constructors, so we don't rely on
callers in the type checker doing the right thing.
When we refer to a constructor within the type checker, always use the
type through which the constructor was found as the result of
construction, so that we can type-check uses of inherited complete
object initializers. Fixed a problem with the creation of
OpenExistentialExprs when the base object is a metatype.
The changes to the code completion tests are an improvement: we're
generating ExprSpecific completion results when referring to the
superclass initializer with the same signature as the initializer
we're in after "super.".
Swift SVN r14551
variables
This change allows the type checker to create member references to generic
nominals with free type variables -- see tests. This is important for code
completion, for example, swift.Dictionary.#^A^#
Fixes rdar://15980316
Swift SVN r14461
Within a DynamicSelf method, we can [*] construct an object of type
DynamicSelf by calling an initializer on the metatype
value. Type-check and build a reasonable AST for this. This is the
rest of <rdar://problem/15862605>, but see the [*] below for it to
actually be useful.
[*] We're still subject to the restriction that one cannot actually
invoke an initializer on a class metatype value that is not statically
derived; that's the intent behind "virtual" initializers
<rdar://problem/15758600>.
Swift SVN r14178
- purge @inout from comments in the compiler except for places talking about
the SIL argument convention.
- change diagnostics to not refer to @inout
- Change the astprinter to print InoutType without the @, so it doesn't show
up in diagnostics or in closure argument types in code completion.
- Implement type parsing support for the new inout syntax (before we just
handled patterns).
- Switch the last couple of uses in the stdlib (in types) to inout.
- Various testcase updates (more to come).
Swift SVN r13564
Making DynamicSelf its own special type node makes it easier to opt-in
to the behavior we want rather than opting out of the behavior we
don't want. Some things already work better with this representation,
such as mangling and overriding; others are more broken, such as the
handling of DynamicSelf within generic classes and the lookup of the
DynamicSelf type.
Swift SVN r13141
This eliminates a class of strange type checking failures involving
generics. The actual example is from <rdar://problem/15772601>, but
this also addresses <rdar://problem/15268030> and the root problem,
<rdar://problem/15168483>.
Swift SVN r12974
Use the just-introduced functionality to track the member types of a
type variable to allow type substitution to look up a member type of a
type variable, rather than failing to substitute. NFC yet.
Swift SVN r12972
This eliminates the duplication of type variables that represent the member types of existing type variables. I'm unable to trigger this with a test case at the moment, but it becomes important when we begin to substitute type variables through protocol conformances.
Swift SVN r12971
to non-@mutating methods work in the AST: now the base expression is
always computed as an rvalue, instead of computing them as an lvalue. The
optimization that we were accidentally getting before is now explicitly
modeled, and the non-optimized case is now handled by standard temporary
emission in SILGen instead of with MaterializeExpr. The upshot of this
carefully choreographed step is that there is no change in generated code (!).
Archetype member references still need to be switched over to this new
scheme (at which point materializeexpr is dead), and the optimization
needs to be replicated for 'let' bases (at which point arguments
becoming 'let' is only gated on debug info).
Swift SVN r12120
- MaterializeExpr can never be formed in an argument list (but
still can as the base object) so remove that case from CSApply.
- LValues never exist *inside* of tuples, so remove code related
to that.
Swift SVN r11889
- Change the AST for get/set functions to take self @inout only when they
are @mutating. Setters default to @mutating, but can be explicitly marked
@!mutating. Getters default to not mutating, but can be marked @mutating.
This causes self to follow.
- Change sema to handle semantic analysis of a.y (and subscripts) based on
whether the computed type of a allows mutation (which is when 'a' is an
lvalue, or both the getter and setter are non-mutating). When both of
these conditions fail, 'a.y' has rvalue type, and is thus non-mutable.
- Rework silgen of lvalues to handle this: now properties and subscripts
can have rvalues as bases, which means that all the lvalue machinery needs
to be able to handle the full generality of base expressions (which is
what my recent patches have been paving the way towards).
- Rework silgen of rvalues to similarly handle rvalue bases.
- Rework silgen of both to handle the case where the AST has found a base
expression that is an lvalue, but where only a non-mutating getter or
setter is needed. Right now, we just emit a load of the lvalue, but
it would result in better code to not require the base be an lvalue at
all (todo).
The upshot of all of this is that we are doing *much* less AST-level
materialization (MaterializeExpr goes down), we generate a lot better SIL
out of SILGen in many cases, and 'self' being an rvalue in properties and
subscripts means that we correctly reject code like the examples in
test/Sema/immutability.swift.
Swift SVN r11884
with qualifiers on it, we have two distinct types:
- LValueType(T) aka @lvalue T, which is used for mutable values on the LHS of an
assignment in the typechecker.
- InOutType(T) aka @inout T, which is used for @inout arguments, and the implicit
@inout self argument of mutable methods on value types. This type is also used
at the SIL level for address types.
While I detangled a number of cases that were checking for LValueType (without checking
qualifiers) and only meant @inout or @lvalue, there is more to be done here. Notably,
getRValueType() still strips @inout, which is totally and unbearably wrong.
Swift SVN r11727
- Switch all the 'self' mutable arguments to take self as @inout, since
binding methods to uncurried functions expose them as such.
- Eliminate the subtype relationship between @inout and @inout(implicit),
which means that we eliminate all sorts of weird cases where they get
dropped (see the updated testcases).
- Eliminate the logic in adjustLValueForReference that walks through functions
converting @inout to @inout(implicit) in strange cases.
- Introduce a new set of type checker constraints and conversion kinds to properly
handle assignment operators: when rebound or curried, their input/result argument
is exposed as @inout and requires an explicit &. When applied directly (e.g.
as ++i), they get an implicit AddressOfExpr to bind the mutated lvalue as an
@inout argument.
Overall, the short term effect of this is to fix a few old bugs handling lvalues.
The long term effect is to drive a larger wedge between implicit and explicit
lvalues.
Swift SVN r11708
struct rvalue, to produce a struct element directly, without converting the rvalue
to an lvalue.
This means that it no longer materializes an lvalue when applied to a let declaration
or other rvalue. For example, this testcase:
struct X { var a,b : Int}
func g() -> X { return X(1,2) }
func f() {
let a = g().a
}
used to sema into:
(load_expr implicit type='Int'
(member_ref_expr type='@inout (implicit, nonsettable)Int' decl=t.(file).X.a@t.swift:2:16
(materialize_expr implicit type='@inout (implicit)X'
(call_expr type='X'
and silgen into:
%1 = function_ref @_TF1t1gFT_VS_1X : $@thin () -> X // user: %2
%2 = apply %1() : $@thin () -> X // user: %4
%3 = alloc_stack $X // users: %7, %5, %4
store %2 to %3#1 : $*X // id: %4
%5 = struct_element_addr %3#1 : $*X, #a // user: %6
%6 = load %5 : $*Int64
It now sema's into:
(member_ref_expr type='Int' decl=t.(file).X.a@t.swift:1:16
(call_expr type='X'
and silgens into:
%1 = function_ref @_TF1t1gFT_VS_1X : $@thin () -> X // user: %2
%2 = apply %1() : $@thin () -> X // user: %3
%3 = struct_extract %2 : $X, #a
I think I'm finally starting to grok Doug's crazy typechecker magic.
Swift SVN r11599
