Use SuppressibleProtocolSet as InvertibleProtocolSet

Collapse the representations of "suppressible" and "invertible"
protocol sets. Only minor adjustments were required.

Author: DougGregor

include/swift/ABI/SuppressibleProtocols.h

@@ -19,6 +19,7 @@
 #define SWIFT_ABI_SUPPRESSIBLEPROTOCOLS_H
 
 #include <cstdint>
+#include <initializer_list>
 #include <iterator>
 
 namespace swift {
@@ -30,6 +31,8 @@ enum class SuppressibleProtocolKind : uint8_t {
 #include "swift/ABI/SuppressibleProtocols.def"
 };
 
+typedef SuppressibleProtocolKind InvertibleProtocolKind;
+
 /// A set of suppressible protocols, whose bits correspond to the cases of
 /// SuppressibleProtocolKind.
 class SuppressibleProtocolSet {
@@ -47,6 +50,13 @@ class SuppressibleProtocolSet {
   explicit constexpr SuppressibleProtocolSet(StorageType bits) : bits(bits) {}
   constexpr SuppressibleProtocolSet() : bits(0) {}
 
+  SuppressibleProtocolSet(
+      std::initializer_list<SuppressibleProtocolKind> elements
+  ) : bits(0) {
+    for (auto element : elements)
+      insert(element);
+  }
+
   /// Retrieve the raw bits that describe this set.
   StorageType rawBits() const { return bits; }
 
@@ -63,6 +73,12 @@ class SuppressibleProtocolSet {
     bits = bits | getMask(kind);
   }
 
+  /// Insert all of the suppressible protocols from the other set into this
+  /// one.
+  void insertAll(SuppressibleProtocolSet other) {
+    bits |= other.bits;
+  }
+
   /// Remove the given suppressible protocol from the set.
   void remove(SuppressibleProtocolKind kind) {
     uint16_t mask = getMask(kind);

include/swift/AST/InvertibleProtocolKind.h

@@ -14,9 +14,6 @@
 #define SWIFT_AST_KNOWNPROTOCOLS_H
 
 #include "swift/ABI/SuppressibleProtocols.h"
-#include "swift/Basic/InlineBitfield.h"
-#include "swift/Basic/FixedBitSet.h"
-#include "swift/AST/InvertibleProtocolKind.h"
 #include "swift/Config.h"
 
 namespace llvm {
@@ -53,14 +50,13 @@ llvm::StringRef getProtocolName(KnownProtocolKind kind);
 
 enum : uint8_t {
   // Use preprocessor trick to count all the invertible protocols.
-#define INVERTIBLE_PROTOCOL_WITH_NAME(Id, Name) +1
+#define SUPPRESSIBLE_PROTOCOL(Name, Bit) +1
   /// The number of invertible protocols.
   NumInvertibleProtocols =
-#include "swift/AST/KnownProtocols.def"
+#include "swift/ABI/SuppressibleProtocols.def"
 };
 
-using InvertibleProtocolSet = FixedBitSet<NumInvertibleProtocols,
-                                          InvertibleProtocolKind>;
+using InvertibleProtocolSet = SuppressibleProtocolSet;
 
 /// Maps a KnownProtocol to the set of InvertibleProtocols, if a mapping exists.
 /// \returns None if the known protocol is not invertible.

include/swift/AST/KnownProtocols.h

@@ -22,7 +22,7 @@
 #include "swift/Basic/LLVM.h"
 
 #include "swift/ABI/MetadataValues.h"
-#include "swift/AST/InvertibleProtocolKind.h"
+#include "swift/ABI/SuppressibleProtocols.h"
 #include "swift/AST/LayoutConstraintKind.h"
 #include "swift/AST/RequirementKind.h"
 #include "swift/Basic/OptionSet.h"

include/swift/Demangling/TypeDecoder.h

@@ -7774,15 +7774,15 @@ static void getSyntacticInheritanceClause(const ProtocolDecl *proto,
                          /*isPreconcurrency=*/false);
   }
 
-  InvertibleProtocolSet inverses = InvertibleProtocolSet::full();
+  InvertibleProtocolSet inverses = InvertibleProtocolSet::allKnown();
 
   for (auto *inherited : proto->getInheritedProtocols()) {
     if (auto ip = inherited->getInvertibleProtocolKind()) {
       inverses.remove(*ip);
       continue;
     }
 
-    for (auto ip : InvertibleProtocolSet::full()) {
+    for (auto ip : InvertibleProtocolSet::allKnown()) {
       auto *proto = ctx.getProtocol(getKnownProtocolKind(ip));
       if (inherited->inheritsFrom(proto))
         inverses.remove(ip);

lib/AST/ASTPrinter.cpp

@@ -1326,7 +1326,7 @@ static GenericSignature getPlaceholderGenericSignature(
       auto type = genericParam->getDeclaredInterfaceType();
       genericParams.push_back(type->castTo<GenericTypeParamType>());
 
-      for (auto ip : InvertibleProtocolSet::full()) {
+      for (auto ip : InvertibleProtocolSet::allKnown()) {
         auto proto = ctx.getProtocol(getKnownProtocolKind(ip));
         requirements.emplace_back(RequirementKind::Conformance, type,
                                   proto->getDeclaredInterfaceType());

lib/AST/Decl.cpp

@@ -661,7 +661,7 @@ Type GenericSignatureImpl::getUpperBound(Type type,
   InvertibleProtocolSet inverses;
 
   if (!superclass && !hasExplicitAnyObject) {
-    for (auto ip : InvertibleProtocolSet::full()) {
+    for (auto ip : InvertibleProtocolSet::allKnown()) {
       auto *kp = ctx.getProtocol(::getKnownProtocolKind(ip));
       if (!requiresProtocol(type, kp))
         inverses.insert(ip);
@@ -1257,7 +1257,7 @@ void GenericSignatureImpl::getRequirementsWithInverses(
     if (getSuperclassBound(gp) || getConcreteType(gp))
       continue;
 
-    for (auto ip : InvertibleProtocolSet::full()) {
+    for (auto ip : InvertibleProtocolSet::allKnown()) {
       auto *proto = ctx.getProtocol(getKnownProtocolKind(ip));
 
       // If we can derive a conformance to this protocol, then don't add an
@@ -1297,7 +1297,7 @@ RequirementSignature RequirementSignature::getPlaceholderRequirementSignature(
     inheritedProtos.push_back(inheritedProto);
   }
 
-  for (auto ip : InvertibleProtocolSet::full()) {
+  for (auto ip : InvertibleProtocolSet::allKnown()) {
     auto *otherProto = ctx.getProtocol(getKnownProtocolKind(ip));
     inheritedProtos.push_back(otherProto);
   }
@@ -1313,7 +1313,7 @@ RequirementSignature RequirementSignature::getPlaceholderRequirementSignature(
   }
 
   for (auto *assocTypeDecl : proto->getAssociatedTypeMembers()) {
-    for (auto ip : InvertibleProtocolSet::full()) {
+    for (auto ip : InvertibleProtocolSet::allKnown()) {
       auto *otherProto = ctx.getProtocol(getKnownProtocolKind(ip));
       requirements.emplace_back(RequirementKind::Conformance,
                                 assocTypeDecl->getDeclaredInterfaceType(),
@@ -1349,7 +1349,7 @@ void RequirementSignature::getRequirementsWithInverses(
         sig->getConcreteType(interfaceType))
       return;
 
-    for (auto ip : InvertibleProtocolSet::full()) {
+    for (auto ip : InvertibleProtocolSet::allKnown()) {
       auto *proto = ctx.getProtocol(getKnownProtocolKind(ip));
 
       // If we can derive a conformance to this protocol, then don't add an

lib/AST/GenericSignature.cpp

@@ -3304,7 +3304,7 @@ InheritedProtocolsRequest::evaluate(Evaluator &evaluator,
   }
 
   if (!skipInverses) {
-    for (auto ip : InvertibleProtocolSet::full()) {
+    for (auto ip : InvertibleProtocolSet::allKnown()) {
       // Unless the user wrote ~P in the syntactic inheritance clause, the
       // semantic inherited list includes P.
       if (!inverses.contains(ip))

lib/AST/NameLookup.cpp

@@ -1087,7 +1087,7 @@ void NominalTypeDecl::prepareConformanceTable() const {
     inverses.insert(InvertibleProtocolKind::Escapable);
 
   bool hasSuppressedConformances = false;
-  for (auto ip : InvertibleProtocolSet::full()) {
+  for (auto ip : InvertibleProtocolSet::allKnown()) {
     if (!inverses.contains(ip) ||
         (isa<ClassDecl>(this) &&
          !ctx.LangOpts.hasFeature(Feature::MoveOnlyClasses))) {
@@ -1281,7 +1281,7 @@ static SmallVector<ProtocolConformance *, 2> findSynthesizedConformances(
 
     // Triggers synthesis of a possibly conditional conformance.
     // For the unconditional ones, see NominalTypeDecl::prepareConformanceTable
-    for (auto ip : InvertibleProtocolSet::full())
+    for (auto ip : InvertibleProtocolSet::allKnown())
       trySynthesize(getKnownProtocolKind(ip));
 
     if (nominal->getASTContext().LangOpts.hasFeature(

lib/AST/ProtocolConformance.cpp

@@ -350,7 +350,7 @@ void InverseRequirement::expandDefaults(
     ArrayRef<Type> gps,
     SmallVectorImpl<StructuralRequirement> &result) {
   for (auto gp : gps) {
-    for (auto ip : InvertibleProtocolSet::full()) {
+    for (auto ip : InvertibleProtocolSet::allKnown()) {
       auto proto = ctx.getProtocol(getKnownProtocolKind(ip));
       result.push_back({{RequirementKind::Conformance, gp,
                          proto->getDeclaredInterfaceType()},