Subsume SWIFT_STDLIB_USE_NONATOMIC_RC into SWIFT_STDLIB_SINGLE_THREADED_RUNTIME (swiftlang#33643)

Author: kubamracek

stdlib/CMakeLists.txt

@@ -21,18 +21,10 @@ option(SWIFT_RUNTIME_MACHO_NO_DYLD
   "Build stdlib assuming the runtime environment uses Mach-O but does not support dynamic modules."
   FALSE)
 
-option(SWIFT_STDLIB_USE_NONATOMIC_RC
-    "Build the standard libraries and overlays with nonatomic reference count operations enabled"
-    FALSE)
-
 option(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME
-    "Build the standard libraries assuming that they will be used in an environment with only a single thread. If set, also forces SWIFT_STDLIB_USE_NONATOMIC_RC to On."
+    "Build the standard libraries assuming that they will be used in an environment with only a single thread."
     FALSE)
 
-if(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME)
-  set(SWIFT_STDLIB_USE_NONATOMIC_RC TRUE)
-endif()
-
 #
 # End of user-configurable options.
 #

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -306,10 +306,6 @@ function(_add_target_variant_c_compile_flags)
     list(APPEND result "-DSWIFT_RUNTIME_MACHO_NO_DYLD")
   endif()
 
-  if(SWIFT_STDLIB_USE_NONATOMIC_RC)
-    list(APPEND result "-DSWIFT_STDLIB_USE_NONATOMIC_RC")
-  endif()
-
   if(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME)
     list(APPEND result "-DSWIFT_STDLIB_SINGLE_THREADED_RUNTIME")
   endif()

stdlib/cmake/modules/SwiftSource.cmake

@@ -404,7 +404,7 @@ function(_compile_swift_files
     list(APPEND swift_flags "-enable-library-evolution")
   endif()
 
-  if(SWIFT_STDLIB_USE_NONATOMIC_RC)
+  if(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME)
     list(APPEND swift_flags "-Xfrontend" "-assume-single-threaded")
   endif()
 

stdlib/public/runtime/MetadataImpl.h

@@ -136,7 +136,7 @@ template <class Impl, class T> struct RetainableBoxBase {
   static constexpr size_t stride = sizeof(T);
   static constexpr bool isPOD = false;
   static constexpr bool isBitwiseTakable = true;
-#ifdef SWIFT_STDLIB_USE_NONATOMIC_RC
+#ifdef SWIFT_STDLIB_SINGLE_THREADED_RUNTIME
   static constexpr bool isAtomic = false;
 #else
   static constexpr bool isAtomic = true;

test/lit.site.cfg.in

@@ -87,8 +87,8 @@ if "@SWIFT_AST_VERIFIER@" == "TRUE":
 if "@SWIFT_OPTIMIZED@" == "TRUE":
     config.available_features.add("optimized_stdlib")
 
-if "@SWIFT_STDLIB_USE_NONATOMIC_RC@" == "TRUE":
-    config.available_features.add("nonatomic_rc")
+if "@SWIFT_STDLIB_SINGLE_THREADED_RUNTIME@" == "TRUE":
+    config.available_features.add("single_threaded_runtime")
 
 if "@SWIFT_ENABLE_RUNTIME_FUNCTION_COUNTERS@" == "TRUE":
     config.available_features.add('runtime_function_counters')

utils/build-presets.ini

@@ -212,21 +212,6 @@ skip-test-ios-simulator
 skip-test-tvos-simulator
 skip-test-watchos-simulator
 
-[preset: buildbot,tools=RA,stdlib=RD,single-thread]
-mixin-preset=
-    mixin_buildbot_tools_RA_stdlib_RD
-
-dash-dash
-
-# Enable non-atomic build of the stdlib
-swift-stdlib-use-nonatomic-rc=true
-
-# Don't run host tests for iOS, tvOS and watchOS platforms to make the build
-# faster.
-skip-test-ios-host
-skip-test-tvos-host
-skip-test-watchos-host
-
 [preset: buildbot,tools=R,stdlib=RD]
 mixin-preset=
     mixin_buildbot_tools_R_stdlib_RD

utils/build-script-impl

@@ -186,7 +186,6 @@ KNOWN_SETTINGS=(
     swift-primary-variant-sdk                     ""                "default SDK for target binaries"
     swift-runtime-enable-leak-checker             "0"               "Enable leaks checking routines in the runtime"
     swift-stdlib-enable-assertions                "1"               "enable assertions in Swift"
-    swift-stdlib-use-nonatomic-rc                 "0"               "build the Swift stdlib and overlays with nonatomic reference count operations enabled"
     swift-tools-enable-lto                        ""                "enable LTO compilation of Swift tools. *NOTE* This does not include the swift standard library and runtime. Must be set to one of 'thin' or 'full'"
     extra-swift-args                              ""                "Extra arguments to pass to swift modules which match regex. Assumed to be a flattened cmake list consisting of [module_regexp, args, module_regexp, args, ...]"
     report-statistics                             "0"               "set to 1 to generate compilation statistics files for swift libraries"
@@ -1755,7 +1754,6 @@ for host in "${ALL_HOSTS[@]}"; do
                     -DSWIFT_ANALYZE_CODE_COVERAGE:STRING=$(toupper "${SWIFT_ANALYZE_CODE_COVERAGE}")
                     -DSWIFT_STDLIB_BUILD_TYPE:STRING="${SWIFT_STDLIB_BUILD_TYPE}"
                     -DSWIFT_STDLIB_ASSERTIONS:BOOL=$(true_false "${SWIFT_STDLIB_ENABLE_ASSERTIONS}")
-                    -DSWIFT_STDLIB_USE_NONATOMIC_RC:BOOL=$(true_false "${SWIFT_STDLIB_USE_NONATOMIC_RC}")
                     -DSWIFT_ENABLE_COMPATIBILITY_OVERRIDES:BOOL=$(true_false "${SWIFT_ENABLE_COMPATIBILITY_OVERRIDES}")
                     -DSWIFT_STDLIB_SINGLE_THREADED_RUNTIME:BOOL=$(true_false "${SWIFT_STDLIB_SINGLE_THREADED_RUNTIME}")
                     -DSWIFT_ENABLE_RUNTIME_FUNCTION_COUNTERS:BOOL=$(true_false "${SWIFT_ENABLE_RUNTIME_FUNCTION_COUNTERS}")

validation-test/Runtime/weak-reference-racetests.swift

@@ -1,7 +1,7 @@
 // RUN: %target-run-simple-swift
 // REQUIRES: executable_test
 // REQUIRES: stress_test
-// UNSUPPORTED: nonatomic_rc
+// UNSUPPORTED: single_threaded_runtime
 
 import StdlibUnittest
 

validation-test/SILOptimizer/string_switch.swift

@@ -4,7 +4,7 @@
 // REQUIRES: swift_stdlib_no_asserts,optimized_stdlib
 // REQUIRES: stress_test
 // REQUIRES: executable_test
-// UNSUPPORTED: nonatomic_rc
+// UNSUPPORTED: single_threaded_runtime
 
 import StdlibUnittest
 

validation-test/StdlibUnittest/AtomicInt.swift

@@ -4,7 +4,7 @@
 // RUN: %target-run %t.out
 // REQUIRES: executable_test
 // REQUIRES: stress_test
-// UNSUPPORTED: nonatomic_rc
+// UNSUPPORTED: single_threaded_runtime
 
 import SwiftPrivate
 import StdlibUnittest