Enable MainActor in embedded concurrency, add ExecutorImpl.cpp

`ExecutorImpl.cpp` should be moved from `SWIFT_RUNTIME_CONCURRENCY_NONEMBEDDED_C_SOURCES` to `SWIFT_RUNTIME_CONCURRENCY_C_SOURCES`. This way we can also include `ExecutorImpl.swift` and use `PlatformExecutorCooperative.swift` in embedded concurrency for WASI.

Author: MaxDesiatov

stdlib/public/Concurrency/CMakeLists.txt

@@ -78,12 +78,13 @@ set(SWIFT_RUNTIME_CONCURRENCY_C_SOURCES
   Actor.cpp
   AsyncLet.cpp
   Clock.cpp
-  GlobalExecutor.cpp
   ConcurrencyHooks.cpp
+  GlobalExecutor.cpp
   EmbeddedSupport.cpp
   Error.cpp
   ExecutorBridge.cpp
   ExecutorChecks.cpp
+  ExecutorImpl.cpp
   Task.cpp
   TaskAlloc.cpp
   TaskStatus.cpp
@@ -168,12 +169,10 @@ set(SWIFT_RUNTIME_CONCURRENCY_SWIFT_SOURCES
   PlatformExecutorFreeBSD.swift
 )
 
-set(SWIFT_RUNTIME_CONCURRENCY_NONEMBEDDED_C_SOURCES
-  ExecutorImpl.cpp
-)
-
 set(SWIFT_RUNTIME_CONCURRENCY_EXECUTOR_SOURCES)
 set(SWIFT_RUNTIME_CONCURRENCY_NONEMBEDDED_SWIFT_SOURCES)
+set(SWIFT_RUNTIME_CONCURRENCY_NONEMBEDDED_C_SOURCES
+)
 
 if("${SWIFT_CONCURRENCY_GLOBAL_EXECUTOR}" STREQUAL "dispatch")
   set(SWIFT_RUNTIME_CONCURRENCY_EXECUTOR_SOURCES
@@ -196,10 +195,6 @@ else()
   )
 endif()
 
-set(SWIFT_RUNTIME_CONCURRENCY_EMBEDDED_SWIFT_SOURCES
-  PlatformExecutorNone.swift
-  )
-
 set(LLVM_OPTIONAL_SOURCES
   DispatchGlobalExecutor.cpp
   CooperativeGlobalExecutor.cpp
@@ -315,6 +310,19 @@ if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB AND SWIFT_SHOULD_BUILD_EMBEDDED_CONCURRENC
       endif()
     endif()
 
+    if("${arch}" MATCHES "wasm32")
+      set(SWIFT_RUNTIME_CONCURRENCY_EMBEDDED_SWIFT_SOURCES
+        ExecutorImpl.swift
+        PlatformExecutorCooperative.swift
+      )
+    else()
+      set(SWIFT_RUNTIME_CONCURRENCY_EMBEDDED_SWIFT_SOURCES
+        ExecutorImpl.swift
+        PlatformExecutorNone.swift
+      )
+    endif()
+
+
     set(SWIFT_SDK_embedded_THREADING_PACKAGE none)
     set(SWIFT_SDK_embedded_ARCH_${arch}_MODULE "${mod}")
     set(SWIFT_SDK_embedded_ARCH_${mod}_MODULE "${mod}")

stdlib/public/Concurrency/Executor.swift

@@ -610,7 +610,7 @@ func _createDefaultExecutors() {
   }
 }
 
-#if !$Embedded && !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
+#if !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 extension MainActor {
   @available(StdlibDeploymentTarget 6.2, *)
   static var _executor: (any MainExecutor)? = nil
@@ -627,7 +627,7 @@ extension MainActor {
     return _executor!
   }
 }
-#endif // !$Embedded && !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
+#endif // !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 
 extension Task where Success == Never, Failure == Never {
   @available(StdlibDeploymentTarget 6.2, *)

stdlib/public/Concurrency/ExecutorBridge.swift

@@ -91,7 +91,6 @@ internal func _jobGetExecutorPrivateData(
   _ job: Builtin.Job
 ) -> UnsafeMutableRawPointer
 
-#if !$Embedded
 #if !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 @available(StdlibDeploymentTarget 6.2, *)
 @_silgen_name("swift_getMainExecutor")
@@ -104,7 +103,6 @@ internal func _getMainExecutorAsSerialExecutor() -> (any SerialExecutor)? {
 @_silgen_name("swift_getMainExecutor")
 internal func _getMainExecutorAsSerialExecutor() -> (any SerialExecutor)?
 #endif // SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
-#endif // !$Embedded
 
 @available(StdlibDeploymentTarget 6.2, *)
 @_silgen_name("swift_dispatchMain")

stdlib/public/Concurrency/MainActor.swift

@@ -12,8 +12,6 @@
 
 import Swift
 
-#if !$Embedded
-
 #if SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 @available(SwiftStdlib 5.1, *)
 @available(*, unavailable, message: "Unavailable in task-to-thread concurrency model")
@@ -197,4 +195,3 @@ public func _deinitOnExecutorMainActorBackDeploy(
 
 #endif // !SWIFT_STDLIB_TASK_TO_THREAD_MODEL_CONCURRENCY
 
-#endif // !$Embedded