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Merge pull request #40925 from hborla/escaping-archetype-type-variables
[Sema] Construct `OpenedArchetypeType` with a canonical existential type.
2 parents 477b4d6 + b3b24a7 commit a8cde12

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16 files changed

+116
-41
lines changed

16 files changed

+116
-41
lines changed

‎include/swift/AST/Types.h‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -5654,7 +5654,7 @@ class OpenedArchetypeType final : public ArchetypeType,
56545654
/// \param knownID When non-empty, the known ID of the archetype. When empty,
56555655
/// a fresh archetype with a unique ID will be opened.
56565656
static CanTypeWrapper<OpenedArchetypeType> get(
5657-
Type existential, Optional<UUID> knownID = None);
5657+
CanType existential, Optional<UUID> knownID = None);
56585658

56595659
/// Get or create an archetype that represents the opened type
56605660
/// of an existential value.
@@ -5665,20 +5665,20 @@ class OpenedArchetypeType final : public ArchetypeType,
56655665
/// \param knownID When non-empty, the known ID of the archetype. When empty,
56665666
/// a fresh archetype with a unique ID will be opened.
56675667
static CanTypeWrapper<OpenedArchetypeType> get(
5668-
Type existential, Type interfaceType, Optional<UUID> knownID = None);
5668+
CanType existential, Type interfaceType, Optional<UUID> knownID = None);
56695669

56705670
/// Create a new archetype that represents the opened type
56715671
/// of an existential value.
56725672
///
56735673
/// \param existential The existential type or existential metatype to open.
56745674
/// \param interfaceType The interface type represented by this archetype.
5675-
static CanType getAny(Type existential, Type interfaceType);
5675+
static CanType getAny(CanType existential, Type interfaceType);
56765676

56775677
/// Create a new archetype that represents the opened type
56785678
/// of an existential value.
56795679
///
56805680
/// \param existential The existential type or existential metatype to open.
5681-
static CanType getAny(Type existential);
5681+
static CanType getAny(CanType existential);
56825682

56835683
/// Retrieve the ID number of this opened existential.
56845684
UUID getOpenedExistentialID() const;

‎lib/AST/ASTContext.cpp‎

Lines changed: 16 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -4286,15 +4286,25 @@ CanTypeWrapper<OpenedArchetypeType> OpenedArchetypeType::getNew(
42864286
}
42874287

42884288
CanTypeWrapper<OpenedArchetypeType> OpenedArchetypeType::get(
4289-
Type existential, Optional<UUID> knownID) {
4289+
CanType existential, Optional<UUID> knownID) {
42904290
Type interfaceType = GenericTypeParamType::get(
42914291
/*isTypeSequence=*/false, 0, 0, existential->getASTContext());
42924292
return get(existential, interfaceType, knownID);
42934293
}
42944294

4295-
CanOpenedArchetypeType OpenedArchetypeType::get(Type existential,
4295+
CanOpenedArchetypeType OpenedArchetypeType::get(CanType existential,
42964296
Type interfaceType,
42974297
Optional<UUID> knownID) {
4298+
// FIXME: Opened archetypes can't be transformed because the
4299+
// the identity of the archetype has to be preserved. This
4300+
// means that simplifying an opened archetype in the constraint
4301+
// system to replace type variables with fixed types is not
4302+
// yet supported. For now, assert that an opened archetype never
4303+
// contains type variables to catch cases where type variables
4304+
// would be applied to the type-checked AST.
4305+
assert(!existential->hasTypeVariable() &&
4306+
"opened existentials containing type variables cannot be simplified");
4307+
42984308
auto &ctx = existential->getASTContext();
42994309
auto &openedExistentialEnvironments =
43004310
ctx.getImpl().OpenedExistentialEnvironments;
@@ -4327,17 +4337,18 @@ CanOpenedArchetypeType OpenedArchetypeType::get(Type existential,
43274337
}
43284338

43294339

4330-
CanType OpenedArchetypeType::getAny(Type existential, Type interfaceType) {
4340+
CanType OpenedArchetypeType::getAny(CanType existential, Type interfaceType) {
43314341
if (auto metatypeTy = existential->getAs<ExistentialMetatypeType>()) {
4332-
auto instanceTy = metatypeTy->getExistentialInstanceType();
4342+
auto instanceTy =
4343+
metatypeTy->getExistentialInstanceType()->getCanonicalType();
43334344
return CanMetatypeType::get(
43344345
OpenedArchetypeType::getAny(instanceTy, interfaceType));
43354346
}
43364347
assert(existential->isExistentialType());
43374348
return OpenedArchetypeType::get(existential, interfaceType);
43384349
}
43394350

4340-
CanType OpenedArchetypeType::getAny(Type existential) {
4351+
CanType OpenedArchetypeType::getAny(CanType existential) {
43414352
Type interfaceType = GenericTypeParamType::get(
43424353
/*isTypeSequence=*/false, 0, 0, existential->getASTContext());
43434354
return getAny(existential, interfaceType);

‎lib/AST/Type.cpp‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -5613,13 +5613,14 @@ SILBoxType::SILBoxType(ASTContext &C,
56135613
Type TypeBase::openAnyExistentialType(OpenedArchetypeType *&opened) {
56145614
assert(isAnyExistentialType());
56155615
if (auto metaty = getAs<ExistentialMetatypeType>()) {
5616-
opened = OpenedArchetypeType::get(metaty->getExistentialInstanceType());
5616+
opened = OpenedArchetypeType::get(
5617+
metaty->getExistentialInstanceType()->getCanonicalType());
56175618
if (metaty->hasRepresentation())
56185619
return MetatypeType::get(opened, metaty->getRepresentation());
56195620
else
56205621
return MetatypeType::get(opened);
56215622
}
5622-
opened = OpenedArchetypeType::get(this);
5623+
opened = OpenedArchetypeType::get(getCanonicalType());
56235624
return opened;
56245625
}
56255626

‎lib/IDE/CodeCompletion.cpp‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4100,7 +4100,7 @@ class CompletionLookup final : public swift::VisibleDeclConsumer {
41004100

41014101
if (!ExprType->getMetatypeInstanceType()->isAnyObject())
41024102
if (ExprType->isAnyExistentialType())
4103-
ExprType = OpenedArchetypeType::getAny(ExprType);
4103+
ExprType = OpenedArchetypeType::getAny(ExprType->getCanonicalType());
41044104

41054105
if (!IsSelfRefExpr && !IsSuperRefExpr && ExprType->getAnyNominal() &&
41064106
ExprType->getAnyNominal()->isActor()) {

‎lib/SILGen/SILGenBuiltin.cpp‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -297,7 +297,7 @@ static ManagedValue emitCastToReferenceType(SILGenFunction &SGF,
297297

298298
// If the argument is existential, open it.
299299
if (argTy->isClassExistentialType()) {
300-
auto openedTy = OpenedArchetypeType::get(argTy);
300+
auto openedTy = OpenedArchetypeType::get(argTy->getCanonicalType());
301301
SILType loweredOpenedTy = SGF.getLoweredLoadableType(openedTy);
302302
arg = SGF.B.createOpenExistentialRef(loc, arg, loweredOpenedTy);
303303
}
@@ -790,7 +790,7 @@ static ManagedValue emitBuiltinCastToBridgeObject(SILGenFunction &SGF,
790790

791791
// If the argument is existential, open it.
792792
if (sourceType->isClassExistentialType()) {
793-
auto openedTy = OpenedArchetypeType::get(sourceType);
793+
auto openedTy = OpenedArchetypeType::get(sourceType->getCanonicalType());
794794
SILType loweredOpenedTy = SGF.getLoweredLoadableType(openedTy);
795795
ref = SGF.B.createOpenExistentialRef(loc, ref, loweredOpenedTy);
796796
}

‎lib/SILGen/SILGenExpr.cpp‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1850,7 +1850,8 @@ RValue RValueEmitter::visitErasureExpr(ErasureExpr *E, SGFContext C) {
18501850
auto &existentialTL = SGF.getTypeLowering(E->getType());
18511851
auto concreteFormalType = E->getSubExpr()->getType()->getCanonicalType();
18521852

1853-
auto archetype = OpenedArchetypeType::getAny(E->getType());
1853+
auto archetype = OpenedArchetypeType::getAny(
1854+
E->getType()->getCanonicalType());
18541855
AbstractionPattern abstractionPattern(archetype);
18551856
auto &concreteTL = SGF.getTypeLowering(abstractionPattern,
18561857
concreteFormalType);

‎lib/SILGen/SILGenType.cpp‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -842,7 +842,8 @@ static SILFunction *emitSelfConformanceWitness(SILGenModule &SGM,
842842
ProtocolConformanceRef(conformance));
843843

844844
// Open the protocol type.
845-
auto openedType = OpenedArchetypeType::get(protocol->getExistentialType());
845+
auto openedType = OpenedArchetypeType::get(
846+
protocol->getExistentialType()->getCanonicalType());
846847

847848
// Form the substitutions for calling the witness.
848849
auto witnessSubs = SubstitutionMap::getProtocolSubstitutions(protocol,

‎lib/Sema/CSApply.cpp‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -5370,7 +5370,8 @@ Expr *ExprRewriter::coerceSuperclass(Expr *expr, Type toType) {
53705370
if (fromInstanceType->isExistentialType()) {
53715371
// Coercion from superclass-constrained existential to its
53725372
// concrete superclass.
5373-
auto fromArchetype = OpenedArchetypeType::getAny(fromType);
5373+
auto fromArchetype = OpenedArchetypeType::getAny(
5374+
fromType->getCanonicalType());
53745375

53755376
auto *archetypeVal = cs.cacheType(new (ctx) OpaqueValueExpr(
53765377
expr->getSourceRange(), fromArchetype));
@@ -5433,7 +5434,7 @@ Expr *ExprRewriter::coerceExistential(Expr *expr, Type toType) {
54335434

54345435
// For existential-to-existential coercions, open the source existential.
54355436
if (fromType->isAnyExistentialType()) {
5436-
fromType = OpenedArchetypeType::getAny(fromType);
5437+
fromType = OpenedArchetypeType::getAny(fromType->getCanonicalType());
54375438

54385439
auto *archetypeVal = cs.cacheType(
54395440
new (ctx) OpaqueValueExpr(expr->getSourceRange(), fromType));

‎lib/Sema/CSSimplify.cpp‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -9785,7 +9785,7 @@ ConstraintSystem::simplifyOpenedExistentialOfConstraint(
97859785
instanceTy = metaTy->getExistentialInstanceType();
97869786
}
97879787
assert(instanceTy->isExistentialType());
9788-
Type openedTy = OpenedArchetypeType::get(instanceTy);
9788+
Type openedTy = OpenedArchetypeType::get(instanceTy->getCanonicalType());
97899789
if (isMetatype)
97909790
openedTy = MetatypeType::get(openedTy, getASTContext());
97919791
return matchTypes(type1, openedTy, ConstraintKind::Bind, subflags, locator);

‎lib/Sema/ConstraintSystem.cpp‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1907,7 +1907,8 @@ ConstraintSystem::getTypeOfMemberReference(
19071907
}
19081908
}
19091909
} else if (baseObjTy->isExistentialType()) {
1910-
auto openedArchetype = OpenedArchetypeType::get(baseObjTy);
1910+
auto openedArchetype = OpenedArchetypeType::get(
1911+
baseObjTy->getCanonicalType());
19111912
OpenedExistentialTypes.insert(
19121913
{getConstraintLocator(locator), openedArchetype});
19131914
baseOpenedTy = openedArchetype;

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