Support performance testing with automatic bridging disabled.

Author: aschwaighofer

benchmark/CMakeLists.txt

@@ -17,6 +17,7 @@ include(AddSwiftBenchmarkSuite)
 set(SWIFT_BENCH_MODULES
     single-source/unit-tests/ObjectiveCBridging
     single-source/unit-tests/ObjectiveCBridgingStubs
+    single-source/unit-tests/ObjectiveCNoBridgingStubs
     single-source/unit-tests/StackPromo
     single-source/Ackermann
     single-source/AngryPhonebook

benchmark/cmake/modules/AddSwiftBenchmarkSuite.cmake

@@ -157,6 +157,12 @@ function (swift_benchmark_compile_archopts)
     get_filename_component(module_name "${module_name_path}" NAME)
 
     if(module_name)
+      set(extra_options "")
+      # For this file we disable automatic bridging between Foundation and swift.
+      if("${module_name}" STREQUAL "ObjectiveCNoBridgingStubs")
+        set(extra_options "-Xfrontend"
+                          "-disable-swift-bridge-attr")
+      endif()
       set(objfile "${objdir}/${module_name}.o")
       set(swiftmodule "${objdir}/${module_name}.swiftmodule")
       set(source "${srcdir}/${module_name_path}.swift")
@@ -168,6 +174,7 @@ function (swift_benchmark_compile_archopts)
             "${srcdir}/${module_name_path}.swift"
           COMMAND "${SWIFT_EXEC}"
           ${common_options}
+          ${extra_options}
           "-parse-as-library"
           ${bench_flags}
           "-module-name" "${module_name}"

benchmark/single-source/unit-tests/ObjectiveCNoBridgingStubs.swift

@@ -0,0 +1,39 @@
+//===--- ObjectiveCNoBridgingStubs.swift ----------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is compiled with -Xfrontend -disable-swift-bridge-attr. No bridging
+// of swift types happens.
+//
+//===----------------------------------------------------------------------===//
+
+import TestsUtils
+import Foundation
+import ObjectiveCTests
+
+@inline(never)
+func testObjectiveCBridgeStubFromNSStringRef() {
+  let b = BridgeTester()
+  var nsString : NSString = NSString()
+  for _ in 0 ..< 10_000 {
+    nsString = b.testToString()
+  }
+  CheckResults(nsString.isEqual(to: "Default string value no tagged pointer" as NSString), "Wrong value returned")
+}
+
+@inline(never)
+public func run_ObjectiveCBridgeStubFromNSStringRef(N: Int) {
+  autoreleasepool {
+    for _ in 0 ..< N {
+      testObjectiveCBridgeStubFromNSStringRef()
+    }
+  }
+}

benchmark/utils/main.swift

@@ -65,6 +65,7 @@ import NopDeinit
 import ObjectAllocation
 import ObjectiveCBridging
 import ObjectiveCBridgingStubs
+import ObjectiveCNoBridgingStubs
 import OpenClose
 import Phonebook
 import PolymorphicCalls
@@ -171,6 +172,7 @@ precommitTests = [
   "ObjectiveCBridgeStubToNSString": run_ObjectiveCBridgeStubToNSString,
   "ObjectiveCBridgeStubFromArrayOfNSString": run_ObjectiveCBridgeStubFromArrayOfNSString,
   "ObjectiveCBridgeStubToArrayOfNSString": run_ObjectiveCBridgeStubToArrayOfNSString,
+  "ObjectiveCBridgeStubFromNSStringRef": run_ObjectiveCBridgeStubFromNSStringRef,
   "OpenClose": run_OpenClose,
   "Phonebook": run_Phonebook,
   "PolymorphicCalls": run_PolymorphicCalls,