[Index] Add symbol properties to record the Swift access level of a declaration

clang/include/clang/Index/IndexSymbol.h

@@ -110,21 +110,43 @@ enum class SymbolSubKind : uint8_t {
 typedef uint32_t SymbolPropertySet;
 /// Set of properties that provide additional info about a symbol.
 enum class SymbolProperty : SymbolPropertySet {
-  Generic                       = 1 << 0,
+  Generic = 1 << 0,
   TemplatePartialSpecialization = 1 << 1,
-  TemplateSpecialization        = 1 << 2,
-  UnitTest                      = 1 << 3,
-  IBAnnotated                   = 1 << 4,
-  IBOutletCollection            = 1 << 5,
-  GKInspectable                 = 1 << 6,
-  Local                         = 1 << 7,
+  TemplateSpecialization = 1 << 2,
+  UnitTest = 1 << 3,
+  IBAnnotated = 1 << 4,
+  IBOutletCollection = 1 << 5,
+  GKInspectable = 1 << 6,
+  Local = 1 << 7,
   /// Symbol is part of a protocol interface.
-  ProtocolInterface             = 1 << 8,
-
-  /// Swift-only properties
-  SwiftAsync                    = 1 << 16,
+  ProtocolInterface = 1 << 8,
+
+  /// --- Swift-only properties
+
+  /// Whether this is a `async` function.
+  SwiftAsync = 1 << 16,
+
+  /// Swift Access control levels, packed into 3 bits.
+  ///
+  /// Use \c applyForEachSymbolProperty or \c
+  /// getSwiftAccessLevelFromSymbolPropertySet to correctly unpack these from a
+  /// \c SymbolPropertySet.
+  SwiftAccessControlLessThanFilePrivate = 1 << 17,
+  SwiftAccessControlFilePrivate = 1 << 18,
+  SwiftAccessControlInternal = 1 << 18 | 1 << 17,
+  SwiftAccessControlPackage = 1 << 19,
+  SwiftAccessControlSPI = 1 << 19 | 1 << 17,
+  SwiftAccessControlPublic = 1 << 19 | 1 << 18,
 };
 
+/// The Swift access level is bit-packed into `SymbolPropertySet` so we can't
+/// easily apply a \c SymbolProperty bit-mask to a \c SymbolPropertySet to check
+/// for the access level. This function extracts the access level from a \c
+/// SymbolPropertySet. It guarantees to only ever return a \c
+/// SwiftAccessControl* case of \c SymbolProperty.
+std::optional<SymbolProperty>
+    getSwiftAccessLevelFromSymbolPropertySet(SymbolPropertySet);
+
 /// Set of roles that are attributed to symbol occurrences.
 ///
 /// Low 9 bits of clang-c/include/Index.h CXSymbolRole mirrors this enum.

clang/include/indexstore/indexstore.h

@@ -318,18 +318,24 @@ typedef enum {
   INDEXSTORE_SYMBOL_SUBKIND_SWIFTACCESSORMUTATE = 1018,
 } indexstore_symbol_subkind_t;
 
-INDEXSTORE_OPTIONS(uint64_t, indexstore_symbol_property_t) {
-  INDEXSTORE_SYMBOL_PROPERTY_GENERIC                          = 1 << 0,
-  INDEXSTORE_SYMBOL_PROPERTY_TEMPLATE_PARTIAL_SPECIALIZATION  = 1 << 1,
-  INDEXSTORE_SYMBOL_PROPERTY_TEMPLATE_SPECIALIZATION          = 1 << 2,
-  INDEXSTORE_SYMBOL_PROPERTY_UNITTEST                         = 1 << 3,
-  INDEXSTORE_SYMBOL_PROPERTY_IBANNOTATED                      = 1 << 4,
-  INDEXSTORE_SYMBOL_PROPERTY_IBOUTLETCOLLECTION               = 1 << 5,
-  INDEXSTORE_SYMBOL_PROPERTY_GKINSPECTABLE                    = 1 << 6,
-  INDEXSTORE_SYMBOL_PROPERTY_LOCAL                            = 1 << 7,
-  INDEXSTORE_SYMBOL_PROPERTY_PROTOCOL_INTERFACE               = 1 << 8,
-
-  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ASYNC                      = 1 << 16,
+INDEXSTORE_OPTIONS(uint64_t, indexstore_symbol_property_t){
+  INDEXSTORE_SYMBOL_PROPERTY_GENERIC = 1 << 0,
+  INDEXSTORE_SYMBOL_PROPERTY_TEMPLATE_PARTIAL_SPECIALIZATION = 1 << 1,
+  INDEXSTORE_SYMBOL_PROPERTY_TEMPLATE_SPECIALIZATION = 1 << 2,
+  INDEXSTORE_SYMBOL_PROPERTY_UNITTEST = 1 << 3,
+  INDEXSTORE_SYMBOL_PROPERTY_IBANNOTATED = 1 << 4,
+  INDEXSTORE_SYMBOL_PROPERTY_IBOUTLETCOLLECTION = 1 << 5,
+  INDEXSTORE_SYMBOL_PROPERTY_GKINSPECTABLE = 1 << 6,
+  INDEXSTORE_SYMBOL_PROPERTY_LOCAL = 1 << 7,
+  INDEXSTORE_SYMBOL_PROPERTY_PROTOCOL_INTERFACE = 1 << 8,
+
+  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ASYNC = 1 << 16,
+  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_LESSTHANFILEPRIVATE = 1 << 17,
+  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_FILEPRIVATE = 1 << 18,
+  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_INTERNAL = 1 << 18 | 1 << 17,
+  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_PACKAGE = 1 << 19,
+  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_SPI = 1 << 19 | 1 << 17,
+  INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_PUBLIC = 1 << 19 | 1 << 18,
 };
 
 typedef enum {

clang/lib/Index/IndexDataStoreUtils.cpp

@@ -483,6 +483,25 @@ indexstore_symbol_property_t index::getIndexStoreProperties(SymbolPropertySet Pr
     case SymbolProperty::SwiftAsync:
       storeProp |= INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ASYNC;
       break;
+    case SymbolProperty::SwiftAccessControlLessThanFilePrivate:
+      storeProp |=
+          INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_LESSTHANFILEPRIVATE;
+      break;
+    case SymbolProperty::SwiftAccessControlFilePrivate:
+      storeProp |= INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_FILEPRIVATE;
+      break;
+    case SymbolProperty::SwiftAccessControlInternal:
+      storeProp |= INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_INTERNAL;
+      break;
+    case SymbolProperty::SwiftAccessControlPackage:
+      storeProp |= INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_PACKAGE;
+      break;
+    case SymbolProperty::SwiftAccessControlSPI:
+      storeProp |= INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_SPI;
+      break;
+    case SymbolProperty::SwiftAccessControlPublic:
+      storeProp |= INDEXSTORE_SYMBOL_PROPERTY_SWIFT_ACCESSCONTROL_PUBLIC;
+      break;
     }
   });
   return static_cast<indexstore_symbol_property_t>(storeProp);

clang/lib/Index/IndexSymbol.cpp

@@ -587,6 +587,14 @@ StringRef index::getSymbolLanguageString(SymbolLanguage K) {
   llvm_unreachable("invalid symbol language kind");
 }
 
+std::optional<SymbolProperty>
+index::getSwiftAccessLevelFromSymbolPropertySet(SymbolPropertySet Props) {
+  if (uint32_t AccessLevel = Props & (1 << 19 | 1 << 18 | 1 << 17)) {
+    return (SymbolProperty)AccessLevel;
+  }
+  return std::nullopt;
+}
+
 void index::applyForEachSymbolProperty(SymbolPropertySet Props,
                                   llvm::function_ref<void(SymbolProperty)> Fn) {
 #define APPLY_FOR_PROPERTY(K)                                                  \
@@ -605,6 +613,11 @@ void index::applyForEachSymbolProperty(SymbolPropertySet Props,
   APPLY_FOR_PROPERTY(SwiftAsync);
 
 #undef APPLY_FOR_PROPERTY
+
+  /// Access levels are bit-packed, so we need to handle them explicitly.
+  if (auto AccessLevel = getSwiftAccessLevelFromSymbolPropertySet(Props)) {
+    Fn(*AccessLevel);
+  }
 }
 
 void index::printSymbolProperties(SymbolPropertySet Props, raw_ostream &OS) {
@@ -625,6 +638,18 @@ void index::printSymbolProperties(SymbolPropertySet Props, raw_ostream &OS) {
     case SymbolProperty::Local: OS << "local"; break;
     case SymbolProperty::ProtocolInterface: OS << "protocol"; break;
     case SymbolProperty::SwiftAsync: OS << "swift_async"; break;
+    case SymbolProperty::SwiftAccessControlLessThanFilePrivate:
+      OS << "less_than_private";
+      break;
+    case SymbolProperty::SwiftAccessControlFilePrivate: OS << "fileprivate"; break;
+    case SymbolProperty::SwiftAccessControlInternal: OS << "internal"; break;
+    case SymbolProperty::SwiftAccessControlPackage: OS << "package"; break;
+    case SymbolProperty::SwiftAccessControlSPI:
+      OS << "SPI";
+      break;
+    case SymbolProperty::SwiftAccessControlPublic:
+      OS << "public";
+      break;
     }
   });
 }