Show overriden functions when performing jump-to-definition on a dynamic call

Sources/LanguageServerProtocol/Requests/SymbolInfoRequest.swift

@@ -81,17 +81,52 @@ public struct SymbolDetails: ResponseType, Hashable {
   /// The kind of the symbol
   public var kind: SymbolKind?
 
+  /// Whether the symbol is a dynamic call for which it isn't known which method will be invoked at runtime. This is
+  /// the case for protocol methods and class functions.
+  ///
+  /// Optional because `clangd` does not return whether a symbol is dynamic.
+  public var isDynamic: Bool?
+
+  /// If the symbol is dynamic, the USRs of the types that might be called.
+  ///
+  /// This is relevant in the following cases
+  /// ```swift
+  /// class A {
+  ///   func doThing() {}
+  /// }
+  /// class B: A {}
+  /// class C: B {
+  ///   override func doThing() {}
+  /// }
+  /// class D: A {
+  ///   override func doThing() {}
+  /// }
+  /// func test(value: B) {
+  ///   value.doThing()
+  /// }
+  /// ```
+  ///
+  /// The USR of the called function in `value.doThing` is `A.doThing` (or its
+  /// mangled form) but it can never call `D.doThing`. In this case, the
+  /// receiver USR would be `B`, indicating that only overrides of subtypes in
+  /// `B` may be called dynamically.
+  public var receiverUsrs: [String]?
+
   public init(
     name: String?,
-    containerName: String? = nil,
+    containerName: String?,
     usr: String?,
-    bestLocalDeclaration: Location? = nil,
-    kind: SymbolKind? = nil
+    bestLocalDeclaration: Location?,
+    kind: SymbolKind?,
+    isDynamic: Bool?,
+    receiverUsrs: [String]?
   ) {
     self.name = name
     self.containerName = containerName
     self.usr = usr
     self.bestLocalDeclaration = bestLocalDeclaration
     self.kind = kind
+    self.isDynamic = isDynamic
+    self.receiverUsrs = receiverUsrs
   }
 }

Sources/SourceKitD/SKDResponseArray.swift

@@ -55,6 +55,27 @@ public final class SKDResponseArray {
     return true
   }
 
+  public func map<T>(_ transform: (SKDResponseDictionary) -> T) -> [T] {
+    var result: [T] = []
+    result.reserveCapacity(self.count)
+    self.forEach { _, element in
+      result.append(transform(element))
+      return true
+    }
+    return result
+  }
+
+  public func compactMap<T>(_ transform: (SKDResponseDictionary) -> T?) -> [T] {
+    var result: [T] = []
+    self.forEach { _, element in
+      if let transformed = transform(element) {
+        result.append(transformed)
+      }
+      return true
+    }
+    return result
+  }
+
   /// Attempt to access the item at `index` as a string.
   public subscript(index: Int) -> String? {
     if let cstr = sourcekitd.api.variant_array_get_string(array, index) {

Sources/SourceKitD/sourcekitd_uids.swift

@@ -44,6 +44,7 @@ public struct sourcekitd_keys {
   public let groupname: sourcekitd_uid_t
   public let id: sourcekitd_uid_t
   public let is_system: sourcekitd_uid_t
+  public let isDynamic: sourcekitd_uid_t
   public let kind: sourcekitd_uid_t
   public let length: sourcekitd_uid_t
   public let line: sourcekitd_uid_t
@@ -56,6 +57,7 @@ public struct sourcekitd_keys {
   public let num_bytes_to_erase: sourcekitd_uid_t
   public let offset: sourcekitd_uid_t
   public let ranges: sourcekitd_uid_t
+  public let receivers: sourcekitd_uid_t
   public let refactor_actions: sourcekitd_uid_t
   public let request: sourcekitd_uid_t
   public let results: sourcekitd_uid_t
@@ -122,6 +124,7 @@ public struct sourcekitd_keys {
     groupname = api.uid_get_from_cstr("key.groupname")!
     id = api.uid_get_from_cstr("key.id")!
     is_system = api.uid_get_from_cstr("key.is_system")!
+    isDynamic = api.uid_get_from_cstr("key.is_dynamic")!
     kind = api.uid_get_from_cstr("key.kind")!
     length = api.uid_get_from_cstr("key.length")!
     line = api.uid_get_from_cstr("key.line")!
@@ -134,6 +137,7 @@ public struct sourcekitd_keys {
     num_bytes_to_erase = api.uid_get_from_cstr("key.num_bytes_to_erase")!
     offset = api.uid_get_from_cstr("key.offset")!
     ranges = api.uid_get_from_cstr("key.ranges")!
+    receivers = api.uid_get_from_cstr("key.receivers")!
     refactor_actions = api.uid_get_from_cstr("key.refactor_actions")!
     request = api.uid_get_from_cstr("key.request")!
     results = api.uid_get_from_cstr("key.results")!