[5.9] cherry-pick block list configuration changes

Sources/SwiftDriver/Driver/Driver.swift

@@ -426,6 +426,24 @@ public struct Driver {
     return supportedFrontendFeatures.contains(feature.rawValue)
   }
 
+  @_spi(Testing)
+  public static func findBlocklists(RelativeTo execDir: AbsolutePath) throws ->  [AbsolutePath] {
+    // Expect to find all blocklists in such dir:
+    // .../XcodeDefault.xctoolchain/usr/local/lib/swift/blocklists
+    var results: [AbsolutePath] = []
+    let blockListDir = execDir.parentDirectory
+      .appending(components: "local", "lib", "swift", "blocklists")
+    if (localFileSystem.exists(blockListDir)) {
+      try localFileSystem.getDirectoryContents(blockListDir).forEach {
+        let currentFile = AbsolutePath(blockListDir, try VirtualPath(path: $0).relativePath!)
+        if currentFile.extension == "yml" || currentFile.extension == "yaml" {
+          results.append(currentFile)
+        }
+      }
+    }
+    return results
+  }
+
   /// Handler for emitting diagnostics to stderr.
   public static let stderrDiagnosticsHandler: DiagnosticsEngine.DiagnosticsHandler = { diagnostic in
     stdErrQueue.sync {

Sources/SwiftDriver/Jobs/FrontendJobHelpers.swift

@@ -262,6 +262,13 @@ extension Driver {
       try commandLine.appendAll(.pluginPath, .loadPluginLibrary, from: &parsedOptions)
     }
 
+    if isFrontendArgSupported(.blockListFile) {
+      try Driver.findBlocklists(RelativeTo: try toolchain.executableDir).forEach {
+        commandLine.appendFlag(.blockListFile)
+        commandLine.appendPath($0)
+      }
+    }
+
     // Pass down -user-module-version if we are working with a compiler that
     // supports it.
     if let ver = parsedOptions.getLastArgument(.userModuleVersion)?.asSingle,

Sources/SwiftOptions/Options.swift

@@ -44,6 +44,7 @@ extension Option {
   public static let BF: Option = Option("-BF", .joinedOrSeparate, attributes: [.noDriver, .argumentIsPath], helpText: "add a directory to the baseline framework search path")
   public static let BIEQ: Option = Option("-BI=", .joined, alias: Option.BI, attributes: [.noDriver])
   public static let BI: Option = Option("-BI", .joinedOrSeparate, attributes: [.noDriver, .argumentIsPath], helpText: "add a module for baseline input")
+  public static let blockListFile: Option = Option("-blocklist-file", .separate, attributes: [.frontend, .noDriver], metaVar: "<path>", helpText: "The path to a blocklist configuration file")
   public static let breakageAllowlistPath: Option = Option("-breakage-allowlist-path", .joinedOrSeparate, attributes: [.noDriver, .argumentIsPath], helpText: "An allowlist of breakages to not complain about")
   public static let bridgingHeaderDirectoryForPrint: Option = Option("-bridging-header-directory-for-print", .separate, attributes: [.helpHidden, .frontend, .noDriver], metaVar: "<path>", helpText: "Directory for bridging header to be printed in compatibility header")
   public static let bsdk: Option = Option("-bsdk", .joinedOrSeparate, attributes: [.noDriver, .argumentIsPath], helpText: "path to the baseline SDK to import frameworks")
@@ -72,7 +73,7 @@ extension Option {
   public static let CrossModuleOptimization: Option = Option("-cross-module-optimization", .flag, attributes: [.helpHidden, .frontend], helpText: "Perform cross-module optimization")
   public static let crosscheckUnqualifiedLookup: Option = Option("-crosscheck-unqualified-lookup", .flag, attributes: [.frontend, .noDriver], helpText: "Compare legacy DeclContext- to ASTScope-based unqualified name lookup (for debugging)")
   public static let cxxInteropGettersSettersAsProperties: Option = Option("-cxx-interop-getters-setters-as-properties", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Import getters and setters as computed properties in Swift")
-  public static let cxxInteroperabilityMode: Option = Option("-cxx-interoperability-mode=", .joined, attributes: [.frontend, .moduleInterface], helpText: "Enables C++ interoperability; requires compatbility version to be specified.")
+  public static let cxxInteroperabilityMode: Option = Option("-cxx-interoperability-mode=", .joined, attributes: [.frontend, .moduleInterface], helpText: "Enables C++ interoperability; pass 'default' to enable or 'off' to disable")
   public static let c: Option = Option("-c", .flag, alias: Option.emitObject, attributes: [.frontend, .noInteractive], group: .modes)
   public static let debugAssertAfterParse: Option = Option("-debug-assert-after-parse", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Force an assertion failure after parsing", group: .debugCrash)
   public static let debugAssertImmediately: Option = Option("-debug-assert-immediately", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Force an assertion failure immediately", group: .debugCrash)
@@ -136,6 +137,7 @@ extension Option {
   public static let disableConformanceAvailabilityErrors: Option = Option("-disable-conformance-availability-errors", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Diagnose conformance availability violations as warnings")
   public static let disableConstraintSolverPerformanceHacks: Option = Option("-disable-constraint-solver-performance-hacks", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Disable all the hacks in the constraint solver")
   public static let disableCrossImportOverlays: Option = Option("-disable-cross-import-overlays", .flag, attributes: [.frontend, .noDriver], helpText: "Do not automatically import declared cross-import overlays.")
+  public static let cxxInteropDisableRequirementAtImport: Option = Option("-disable-cxx-interop-requirement-at-import", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Do not require C++ interoperability to be enabled when importing a Swift module that enables C++ interoperability")
   public static let disableDebuggerShadowCopies: Option = Option("-disable-debugger-shadow-copies", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Disable debugger shadow copies of local variables.This option is only useful for testing the compiler.")
   public static let disableDeserializationRecovery: Option = Option("-disable-deserialization-recovery", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Don't attempt to recover from missing xrefs (etc) in swiftmodules")
   public static let disableDeserializationSafety: Option = Option("-disable-deserialization-safety", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Don't avoid reading potentially unsafe decls in swiftmodules")
@@ -384,6 +386,8 @@ extension Option {
   public static let enableOperatorDesignatedTypes: Option = Option("-enable-operator-designated-types", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Enable operator designated types")
   public static let enableOssaCompleteLifetimes: Option = Option("-enable-ossa-complete-lifetimes", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Require linear OSSA lifetimes after SILGen")
   public static let enableOssaModules: Option = Option("-enable-ossa-modules", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Always serialize SIL in ossa form. If this flag is not passed in, when optimizing ownership will be lowered before serializing SIL")
+  public static let enablePackMetadataStackPromotion: Option = Option("-enable-pack-metadata-stack-promotion=", .joined, attributes: [.helpHidden, .frontend, .noDriver], metaVar: "true|false", helpText: "Whether to skip heapifying stack metadata packs when possible.")
+  public static let enablePackMetadataStackPromotionNoArg: Option = Option("-enable-pack-metadata-stack-promotion", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Skip heapifying stack metadata packs when possible.")
   public static let enablePrivateImports: Option = Option("-enable-private-imports", .flag, attributes: [.helpHidden, .frontend, .noInteractive], helpText: "Allows this module's internal and private API to be accessed")
   public static let enableRelativeProtocolWitnessTables: Option = Option("-enable-relative-protocol-witness-tables", .flag, attributes: [.helpHidden, .frontend, .noDriver], helpText: "Enable relative protocol witness tables")
   public static let enableRemoveDeprecatedCheck: Option = Option("-enable-remove-deprecated-check", .flag, attributes: [.noDriver], helpText: "Diagnosing removal of deprecated symbols")
@@ -812,6 +816,7 @@ extension Option {
       Option.BF,
       Option.BIEQ,
       Option.BI,
+      Option.blockListFile,
       Option.breakageAllowlistPath,
       Option.bridgingHeaderDirectoryForPrint,
       Option.bsdk,
@@ -904,6 +909,7 @@ extension Option {
       Option.disableConformanceAvailabilityErrors,
       Option.disableConstraintSolverPerformanceHacks,
       Option.disableCrossImportOverlays,
+      Option.cxxInteropDisableRequirementAtImport,
       Option.disableDebuggerShadowCopies,
       Option.disableDeserializationRecovery,
       Option.disableDeserializationSafety,
@@ -1152,6 +1158,8 @@ extension Option {
       Option.enableOperatorDesignatedTypes,
       Option.enableOssaCompleteLifetimes,
       Option.enableOssaModules,
+      Option.enablePackMetadataStackPromotion,
+      Option.enablePackMetadataStackPromotionNoArg,
       Option.enablePrivateImports,
       Option.enableRelativeProtocolWitnessTables,
       Option.enableRemoveDeprecatedCheck,

TestInputs/Dummy.xctoolchain/usr/local/lib/swift/blocklists/block-list1.yml

@@ -0,0 +1 @@
+---

TestInputs/Dummy.xctoolchain/usr/local/lib/swift/blocklists/block-list2.yaml

@@ -0,0 +1 @@
+---

TestInputs/Dummy.xctoolchain/usr/local/lib/swift/blocklists/block-list3.txt

@@ -0,0 +1 @@
+---

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -6940,6 +6940,13 @@ final class SwiftDriverTests: XCTestCase {
 #endif
   }
 
+  func testFindingBlockLists() throws {
+    let execDir = testInputsPath.appending(components: "Dummy.xctoolchain", "usr", "bin")
+    let list = try Driver.findBlocklists(RelativeTo: execDir)
+    XCTAssertEqual(list.count, 2)
+    XCTAssertTrue(list.allSatisfy { $0.extension! == "yml" || $0.extension! == "yaml"})
+  }
+
   func testToolSearching() throws {
 #if os(Windows)
     let PATH = "Path"