SwiftDriver: enable -sanitize= on Windows selectively

ASAN, UBSAN are available on Windows while TSAN is not. The toolchain
has started building the runtimes and will be distributing them with the
toolchain builds. This change enables the support in the driver for the
santizers on Windows.

Author: compnerd

Sources/SwiftDriver/Jobs/Toolchain+LinkerSupport.swift

@@ -32,8 +32,14 @@ extension Toolchain {
     if platform == "android" {
       platform = "linux"
     }
+
+    // NOTE(compnerd) Windows uses the per-target runtime directory for the
+    // Windows runtimes. This should also be done for the other platforms, but
+    // is not critical. This is done to allow for the Windows runtimes to be
+    // co-located for all the currently supported architectures: x86, x64, arm64.
+    let bIsWindows = targetInfo.target.triple.isWindows
     return VirtualPath.lookup(targetInfo.runtimeResourcePath.path)
-      .appending(components: "clang", "lib", platform)
+      .appending(components: "clang", "lib", bIsWindows ? targetInfo.target.triple.triple : platform)
   }
 
   func runtimeLibraryPaths(

Sources/SwiftDriver/Jobs/WindowsToolchain+LinkerSupport.swift

@@ -223,7 +223,10 @@ extension WindowsToolchain {
       commandLine.appendFlag(optArg)
     }
 
-    // FIXME(compnerd) render asan/ubsan runtime link for executables
+    if !sanitizers.isEmpty {
+      let sanitize = sanitizers.map(\.rawValue).sorted().joined(separator: ",")
+      commandLine.appendFlag("-fsanitize=\(sanitize)")
+    }
 
     if parsedOptions.contains(.profileGenerate) {
       assert(bForceLLD,

Sources/SwiftDriver/Toolchains/WindowsToolchain.swift

@@ -130,6 +130,11 @@ extension WindowsToolchain.ToolchainValidationError {
   public func runtimeLibraryName(for sanitizer: Sanitizer, targetTriple: Triple,
                                  isShared: Bool) throws -> String {
     // TODO(compnerd) handle shared linking
+
+    // FIXME(compnerd) when should `clang_rt.ubsan_standalone_cxx` be used?
+    if sanitizer == .undefinedBehavior {
+      return "clang_rt.ubsan_standalone.lib"
+    }
     return "clang_rt.\(sanitizer.libraryName).lib"
   }
 

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -2708,56 +2708,40 @@ final class SwiftDriverTests: XCTestCase {
 
   func testSanitizerArgs() throws {
     let commonArgs = [
-      "swiftc", "foo.swift", "bar.swift",
-      "-emit-executable", "-target", "x86_64-apple-macosx10.9",
-      "-module-name", "Test"
+      "swiftc", "foo.swift", "bar.swift", "-emit-executable", "-module-name", "Test", "-use-ld=lld"
     ]
-  // FIXME: This doesn't work on Linux.
-  #if os(macOS)
+
+  #if os(macOS) || os(Windows)
     do {
       // address sanitizer
       var driver = try Driver(args: commonArgs + ["-sanitize=address"])
-      let plannedJobs = try driver.planBuild()
-
-      XCTAssertEqual(plannedJobs.count, 3)
-
-      let compileJob = plannedJobs[0]
-      let compileCmd = compileJob.commandLine
-      XCTAssertTrue(compileCmd.contains(.flag("-sanitize=address")))
+      let jobs = try driver.planBuild().removingAutolinkExtractJobs()
 
-      let linkJob = plannedJobs[2]
-      let linkCmd = linkJob.commandLine
-      XCTAssertTrue(linkCmd.contains(.flag("-fsanitize=address")))
+      XCTAssertEqual(jobs.count, 3)
+      XCTAssertJobInvocationMatches(jobs[0], .flag("-sanitize=address"))
+      XCTAssertJobInvocationMatches(jobs[2], .flag("-fsanitize=address"))
     }
 
     do {
       // address sanitizer on a dylib
       var driver = try Driver(args: commonArgs + ["-sanitize=address", "-emit-library"])
-      let plannedJobs = try driver.planBuild()
-
-      XCTAssertEqual(plannedJobs.count, 3)
-
-      let compileJob = plannedJobs[0]
-      let compileCmd = compileJob.commandLine
-      XCTAssertTrue(compileCmd.contains(.flag("-sanitize=address")))
+      let jobs = try driver.planBuild().removingAutolinkExtractJobs()
 
-      let linkJob = plannedJobs[2]
-      let linkCmd = linkJob.commandLine
-      XCTAssertTrue(linkCmd.contains(.flag("-fsanitize=address")))
+      XCTAssertEqual(jobs.count, 3)
+      XCTAssertJobInvocationMatches(jobs[0], .flag("-sanitize=address"))
+      XCTAssertJobInvocationMatches(jobs[2], .flag("-fsanitize=address"))
     }
 
     do {
       // *no* address sanitizer on a static lib
       var driver = try Driver(args: commonArgs + ["-sanitize=address", "-emit-library", "-static"])
-      let plannedJobs = try driver.planBuild()
-
-      XCTAssertEqual(plannedJobs.count, 3)
+      let jobs = try driver.planBuild().removingAutolinkExtractJobs()
 
-      let linkJob = plannedJobs[2]
-      let linkCmd = linkJob.commandLine
-      XCTAssertFalse(linkCmd.contains(.flag("-fsanitize=address")))
+      XCTAssertEqual(jobs.count, 3)
+      XCTAssertFalse(jobs[2].commandLine.contains(.flag("-fsanitize=address")))
     }
 
+#if !os(Windows)
     do {
       // thread sanitizer
       var driver = try Driver(args: commonArgs + ["-sanitize=thread"])
@@ -2773,21 +2757,16 @@ final class SwiftDriverTests: XCTestCase {
       let linkCmd = linkJob.commandLine
       XCTAssertTrue(linkCmd.contains(.flag("-fsanitize=thread")))
     }
+#endif
 
     do {
       // undefined behavior sanitizer
       var driver = try Driver(args: commonArgs + ["-sanitize=undefined"])
-      let plannedJobs = try driver.planBuild()
-
-      XCTAssertEqual(plannedJobs.count, 3)
-
-      let compileJob = plannedJobs[0]
-      let compileCmd = compileJob.commandLine
-      XCTAssertTrue(compileCmd.contains(.flag("-sanitize=undefined")))
+      let jobs = try driver.planBuild().removingAutolinkExtractJobs()
 
-      let linkJob = plannedJobs[2]
-      let linkCmd = linkJob.commandLine
-      XCTAssertTrue(linkCmd.contains(.flag("-fsanitize=undefined")))
+      XCTAssertEqual(jobs.count, 3)
+      XCTAssertJobInvocationMatches(jobs[0], .flag("-sanitize=undefined"))
+      XCTAssertJobInvocationMatches(jobs[2], .flag("-fsanitize=undefined"))
     }
 
     // FIXME: This test will fail when run on macOS, because the driver uses
@@ -7221,7 +7200,7 @@ final class SwiftDriverTests: XCTestCase {
   }
 
   func testSanitizerArgsForTargets() throws {
-    let targets = ["x86_64-unknown-freebsd",  "x86_64-unknown-linux", "x86_64-apple-macosx10.9"]
+    let targets = ["x86_64-unknown-freebsd",  "x86_64-unknown-linux", "x86_64-apple-macosx10.9", "x86_64-unknown-windows-msvc"]
     try targets.forEach {
       var driver = try Driver(args: ["swiftc", "-emit-module", "-target", $0, "foo.swift"])
       _ = try driver.planBuild()