[indexstore-db] Declare Codable conformance, to autosynthesize implementation.

Sources/IndexStoreDB/IndexStoreDB.swift

@@ -38,7 +38,7 @@ public struct PathMapping: Equatable {
   }
 }
 
-public enum SymbolProviderKind: Sendable {
+public enum SymbolProviderKind: Sendable, Codable {
   case clang
   case swift
 

Sources/IndexStoreDB/IndexStoreDBError.swift

@@ -15,7 +15,7 @@ import IndexStoreDB_CIndexStoreDB
 
 import Foundation
 
-public enum IndexStoreDBError: Error {
+public enum IndexStoreDBError: Error, Codable {
   case create(String)
   case loadIndexStore(String)
 }

Sources/IndexStoreDB/Symbol.swift

@@ -13,7 +13,7 @@
 @_implementationOnly
 import IndexStoreDB_CIndexStoreDB
 
-public enum IndexSymbolKind: Hashable, Sendable {
+public enum IndexSymbolKind: Hashable, Sendable, Codable {
   case unknown
   case module
   case namespace
@@ -45,14 +45,14 @@ public enum IndexSymbolKind: Hashable, Sendable {
   case commentTag
 }
 
-public enum Language: Hashable, Sendable {
+public enum Language: Hashable, Sendable, Codable {
   case c
   case cxx
   case objc
   case swift
 }
 
-public struct Symbol: Hashable, Sendable {
+public struct Symbol: Hashable, Sendable, Codable {
 
   public var usr: String
   public var name: String

Sources/IndexStoreDB/SymbolLocation.swift

@@ -14,7 +14,7 @@
 import IndexStoreDB_CIndexStoreDB
 import Foundation
 
-public struct SymbolLocation: Equatable, Sendable {
+public struct SymbolLocation: Equatable, Sendable, Codable {
   public var path: String
   /// The date at which the unit file that contains a symbol has last been modified.
   public var timestamp: Date

Sources/IndexStoreDB/SymbolOccurrence.swift

@@ -13,7 +13,7 @@
 @_implementationOnly
 import IndexStoreDB_CIndexStoreDB
 
-public struct SymbolOccurrence: Equatable {
+public struct SymbolOccurrence: Equatable, Codable {
   public var symbol: Symbol
   public var location: SymbolLocation
   public var roles: SymbolRole
@@ -48,7 +48,7 @@ extension SymbolOccurrence: CustomStringConvertible {
   }
 }
 
-public struct SymbolRelation: Equatable {
+public struct SymbolRelation: Equatable, Codable {
   public var symbol: Symbol
   public var roles: SymbolRole
 

Sources/IndexStoreDB/SymbolProperty.swift

@@ -13,7 +13,7 @@
 @_implementationOnly
 import IndexStoreDB_CIndexStoreDB
 
-public struct SymbolProperty: OptionSet, Hashable, Sendable {
+public struct SymbolProperty: OptionSet, Hashable, Sendable, Codable {
   public var rawValue: UInt64
 
   public static let generic: SymbolProperty = SymbolProperty(rawValue: INDEXSTOREDB_SYMBOL_PROPERTY_GENERIC)

Sources/IndexStoreDB/SymbolRole.swift

@@ -13,7 +13,7 @@
 @_implementationOnly
 import IndexStoreDB_CIndexStoreDB
 
-public struct SymbolRole: OptionSet, Hashable, Sendable {
+public struct SymbolRole: OptionSet, Hashable, Sendable, Codable {
 
   public var rawValue: UInt64
 

Tests/IndexStoreDBTests/IndexTests.swift

@@ -675,4 +675,46 @@ final class IndexTests: XCTestCase {
       largeType.at(ws.testLoc("LargeType:ref"), roles: .reference, symbolProvider: .swift),
     ])
   }
+
+    // Validate automatic synthesized codable for our types
+    func testCodable() throws {
+
+        let encoder: JSONEncoder = JSONEncoder()
+        let decoder: JSONDecoder = JSONDecoder()
+
+        // C-family symbol with no properties
+        let largeType = Symbol(usr: "c:@CT@LargeType", name: "LargeType", kind: .concept, properties: [], language: .c)
+
+        let encodedLargeType = try encoder.encode(largeType)
+        let decodedLargeType = try decoder.decode(Symbol.self, from: encodedLargeType)
+
+        XCTAssertNotNil(encodedLargeType)
+        XCTAssertEqual(decodedLargeType, largeType)
+
+        // Swift Symbol with properties
+        let main = Symbol(usr: "s:4main1ayyF", name: "a()", kind: .instanceMethod, properties: [.unitTest], language: .swift)
+        let encodedMain = try encoder.encode(main)
+        let decodedMain = try decoder.decode(Symbol.self, from: encodedMain)
+        XCTAssertNotNil(encodedMain)
+        XCTAssertEqual(decodedMain, main)
+
+        guard let ws = try staticTibsTestWorkspace(name: "proj1") else { return }
+
+        let usr = "s:4main1cyyF"
+        let csym = Symbol(usr: usr, name: "c()", kind: .function, language: .swift)
+
+        // Symbol occurrence case
+        let ccanon = SymbolOccurrence(
+          symbol: csym,
+          location: SymbolLocation(ws.testLoc("c"), moduleName: "main"),
+          roles: [.definition, .canonical],
+          symbolProvider: .clang,
+          relations: [])
+
+        let encodedCCanon = try encoder.encode(ccanon)
+        let decodedCCanon = try decoder.decode(SymbolOccurrence.self, from: encodedCCanon)
+
+        XCTAssertNotNil(encodedCCanon)
+        XCTAssertEqual(decodedCCanon, ccanon)
+    }
 }