Merge branch 'swiftlang:main' into issue-72199

Author: ph1ps

.github/CODEOWNERS

@@ -8,27 +8,28 @@
 
 # TODO: /.clang-format
 
-/.clang-tidy   @egorzhdan
+/.clang-tidy      @egorzhdan
 
-# TODO: /.dir-locals.el
+/.dir-locals.el   @al45tair
+/.editorconfig    @hamishknight
 # TODO: /.flake8
-# TODO: /.gitattributes
+/.gitattributes   @shahmishal
 
 # .github
 /.github/                                 @shahmishal
 /.github/CODEOWNERS                       @AnthonyLatsis @shahmishal
-/.github/ISSUE_TEMPLATE/                  @AnthonyLatsis @hborla @LucianoPAlmeida @shahmishal @xedin
-/.github/PULL_REQUEST_TEMPLATE.md         @AnthonyLatsis @hborla @LucianoPAlmeida @shahmishal @xedin
+/.github/ISSUE_TEMPLATE/                  @AnthonyLatsis @hborla @shahmishal @xedin
+/.github/PULL_REQUEST_TEMPLATE.md         @AnthonyLatsis @hborla @shahmishal @xedin
 
-# TODO: /.gitignore
+/.gitignore           @shahmishal
 # TODO: /.mailmap
 # TODO: /Brewfile
-# TODO: /CHANGELOG.md
+/CHANGELOG.md         @hborla
 # TODO: /CMakeLists.txt
-# TODO: /CODE_OF_CONDUCT.md
-# TODO: /CODE_OWNERS.TXT
-# TODO: /CONTRIBUTING.md
-# TODO: /LICENSE.txt
+/CODE_OF_CONDUCT.md   @swiftlang/core-team
+/CODE_OWNERS.TXT      @swiftlang/core-team
+/CONTRIBUTING.md      @AnthonyLatsis @xedin
+/LICENSE.txt          @swiftlang/core-team
 # TODO: /README.md
 
 # Runtimes
@@ -60,7 +61,7 @@
 /docs/ABI/RegisterUsage.md                @al45tair
 /docs/CrossCompilationModel.md            @MaxDesiatov
 /docs/Generics                            @slavapestov
-/docs/HowToGuides/                        @AnthonyLatsis @LucianoPAlmeida @xedin
+/docs/HowToGuides/                        @AnthonyLatsis @xedin
 /docs/Optimizer*                          @eeckstein
 /docs/SIL*                                @jckarter
 /docs/Windows*                            @compnerd
@@ -223,7 +224,7 @@
 /test/Generics/                                     @hborla @slavapestov
 /test/Generics/inverse*                             @kavon
 /test/IDE/                                          @ahoppen @bnbarham @hamishknight @rintaro
-/test/IRGen/                                        @rjmccall
+/test/IRGen/                                        @AnthonyLatsis @rjmccall
 /test/Index/                                        @ahoppen @bnbarham @hamishknight @rintaro
 /test/Interop/                                      @zoecarver @egorzhdan @Xazax-hun @j-hui @fahadnayyar @susmonteiro @hnrklssn
 /test/Macros/SwiftifyImport                         @hnrklssn @Xazax-hun
@@ -285,17 +286,20 @@
 
 # utils
 /utils/*windows*                                              @compnerd
+/utils/build_swift/                                           @etcwilde @justice-adams-apple @shahmishal
 /utils/generate-xcode                                         @hamishknight
 /utils/gyb_sourcekit_support/                                 @ahoppen @bnbarham @hamishknight @rintaro
 /utils/sourcekit_fuzzer/                                      @ahoppen @bnbarham @hamishknight @rintaro
 /utils/swift-xcodegen/                                        @hamishknight
+/utils/swift_build_support/                                   @etcwilde @justice-adams-apple @shahmishal
 /utils/swift_build_support/products/earlyswiftsyntax.py       @ahoppen @bnbarham @hamishknight @rintaro
 /utils/swift_build_support/products/skstresstester.py         @ahoppen @bnbarham @hamishknight @rintaro
 /utils/swift_build_support/products/sourcekitlsp.py           @ahoppen @bnbarham @hamishknight @rintaro
 /utils/swift_build_support/products/swiftformat.py            @ahoppen @allevato @bnbarham @hamishknight @rintaro
 /utils/swift_build_support/products/swiftsyntax.py            @ahoppen @bnbarham @hamishknight @rintaro
-/utils/update-checkout*                                       @shahmishal
-/utils/update_checkout/                                       @shahmishal
+/utils/update-checkout*                                       @etcwilde @justice-adams-apple @shahmishal
+/utils/update_checkout/                                       @etcwilde @justice-adams-apple @shahmishal
+/utils/update_checkout/update-checkout-config.json            @shahmishal
 /utils/vim/                                                   @compnerd
 
 # validation-test

CHANGELOG.md

@@ -5,6 +5,61 @@
 
 ## Swift 6.2
 
+* The Swift compiler no longer diagnoses references to declarations that are
+  potentially unavailable because the platform version might not be new enough
+  when those references occur inside of contexts that are also unavailable to
+  that platform. This addresses a long-standing nuisance for multi-platform
+  code. However, there is also a chance that existing source code may become
+  ambiguous as a result:
+
+  ```swift
+  struct A {}
+  struct B {}
+
+  func potentiallyAmbiguous(_: A) {}
+
+  @available(macOS 99, *)
+  func potentiallyAmbiguous(_: B) {}
+
+  @available(macOS, unavailable)
+  func unavailableOnMacOS() {
+    potentiallyAmbiguous(.init()) // error: ambiguous use of 'init()'
+  }
+  ```
+
+  Code that is now ambiguous as a result should likely be restructured since
+  disambiguation based on platform introduction alone has never been a reliable
+  strategy, given that the code would eventually become ambiguous anyways when
+  the deployment target is raised.
+
+* [SE-0470][]:
+  A protocol conformance can be isolated to a specific global actor, meaning that the conformance can only be used by code running on that actor. Isolated conformances are expressed by specifying the global actor on the conformance itself:
+
+  ```swift
+  protocol P {
+    func f()
+  }
+
+  @MainActor
+  class MyType: @MainActor P {
+    /*@MainActor*/ func f() {
+      // must be called on the main actor
+    }
+  }
+  ```
+
+  Swift will produce diagnostics if the conformance is directly accessed in code that isn't guaranteed to execute in the same global actor. For example:
+
+  ```swift
+  func acceptP<T: P>(_ value: T) { }
+
+  /*nonisolated*/ func useIsolatedConformance(myType: MyType) {
+    acceptP(myType) // error: main actor-isolated conformance of 'MyType' to 'P' cannot be used in nonisolated context
+  }
+  ```
+
+  To address such issues, only use an isolated conformance from code that executes on the same global actor.
+
 * [SE-0419][]:
   Introduced the new `Runtime` module, which contains a public API that can
   generate backtraces, presently supported on macOS and Linux.  Capturing a
@@ -392,7 +447,7 @@ And the module structure to support such applications looks like this:
 
 * [SE-0430][]:
 
-  Region Based Isolation is now extended to enable the application of an
+  Region-Based Isolation is now extended to enable the application of an
   explicit `sending` annotation to function parameters and results. A function
   parameter or result that is annotated with `sending` is required to be
   disconnected at the function boundary and thus possesses the capability of
@@ -430,7 +485,7 @@ And the module structure to support such applications looks like this:
 
   func useValue() {
     let x = NonSendableType()
-    let a = await MyActor(x) // Error without Region Based Isolation!
+    let a = await MyActor(x) // Error without Region-Based Isolation!
   }
   ```
 
@@ -10732,6 +10787,7 @@ using the `.dynamicType` member to retrieve the type of an expression should mig
 [SE-0442]: https://github.com/swiftlang/swift-evolution/blob/main/proposals/0442-allow-taskgroup-childtaskresult-type-to-be-inferred.md
 [SE-0444]: https://github.com/swiftlang/swift-evolution/blob/main/proposals/0444-member-import-visibility.md
 [SE-0458]: https://github.com/swiftlang/swift-evolution/blob/main/proposals/0458-strict-memory-safety.md
+[SE-0470]: https://github.com/swiftlang/swift-evolution/blob/main/proposals/0470-isolated-conformances.md
 [#64927]: <https://github.com/apple/swift/issues/64927>
 [#42697]: <https://github.com/apple/swift/issues/42697>
 [#42728]: <https://github.com/apple/swift/issues/42728>

CMakeLists.txt

@@ -1665,13 +1665,14 @@ if(SWIFT_ENABLE_NEW_RUNTIME_BUILD)
 
       ExternalProject_Get_Property("${stdlib_target}-core" INSTALL_DIR)
 
-      ExternalProject_Add("${stdlib_target}-StringProcessing"
-        SOURCE_DIR
-          "${CMAKE_CURRENT_SOURCE_DIR}/Runtimes/Supplemental/StringProcessing"
+      ExternalProject_Add("${stdlib_target}-Supplemental"
+        SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/Runtimes/Supplemental"
         DEPENDS "${stdlib_target}-core"
         INSTALL_DIR "${INSTALL_DIR}"
-        INSTALL_COMMAND "" # No install story set up yet
+        INSTALL_COMMAND ""
+        LIST_SEPARATOR "|"
         CMAKE_ARGS
+          -DSwift_ENABLE_RUNTIMES=StringProcessing
           -DBUILD_SHARED_LIBS=YES
           -DCMAKE_Swift_COMPILER_WORKS:BOOLEAN=YES
           -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}

README.md

@@ -8,7 +8,7 @@
 
 | | **Architecture** | **Build** |
 |---|:---:|:---:|
-| **macOS**        | x86_64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-macos/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-macos)|
+| **macOS**        | Universal |[![Build Status](https://ci.swift.org/job/oss-swift-package-macos/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-macos)|
 | **Ubuntu 20.04** | x86_64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-ubuntu-20_04/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-ubuntu-20_04)|
 | **Ubuntu 20.04** | AArch64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-ubuntu-20_04-aarch64/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-ubuntu-20_04-aarch64)|
 | **Ubuntu 22.04** | x86_64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-ubuntu-22_04/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-ubuntu-22_04)|
@@ -20,8 +20,6 @@
 | **Universal Base Image 9** | x86_64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-ubi-9/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-ubi-9)|
 | **Debian 12** | x86_64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-debian-12/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-debian-12)|
 | **Debian 12** | AArch64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-debian-12-aarch64/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-debian-12-aarch64)|
-| **Fedora 39** | x86_64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-fedora-39/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-fedora-39)|
-| **Fedora 39** | AArch64 |[![Build Status](https://ci.swift.org/job/oss-swift-package-fedora-39-aarch64/lastCompletedBuild/badge/icon)](https://ci.swift.org/job/oss-swift-package-fedora-39-aarch64)|
 | **Windows 10** | x86_64 |[![Build Status](https://ci-external.swift.org/job/swift-main-windows-toolchain/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/swift-main-windows-toolchain)|
 | **Windows 10** | ARM64 |[![Build Status](https://ci-external.swift.org/job/swift-main-windows-toolchain-arm64/lastCompletedBuild/badge/icon)](https://ci-external.swift.org/job/swift-main-windows-toolchain-arm64)|
 

Runtimes/Core/CMakeLists.txt

@@ -82,6 +82,7 @@ include(AvailabilityMacros)
 include(CompilerSettings)
 include(DefaultSettings)
 include(EmitSwiftInterface)
+include(InstallSwiftInterface)
 include(PlatformInfo)
 include(gyb)
 include(ResourceEmbedding)
@@ -159,7 +160,7 @@ add_compile_definitions(
   $<$<BOOL:${SwiftCore_HAS_DARWIN_LIBMALLOC}>:-DSWIFT_STDLIB_HAS_DARWIN_LIBMALLOC> # Anything that includes include/swift/Runtime/Config.h
   $<$<COMPILE_LANGUAGE:C,CXX>:-DSWIFT_THREADING_${SwiftCore_THREADING_PACKAGE}>
   $<$<COMPILE_LANGUAGE:C,CXX>:-DSWIFT_RUNTIME_ENABLE_LEAK_CHECKER=$<BOOL:${SwiftCore_ENABLE_RUNTIME_LEAK_CHECKER}>>
-  $<$<COMPILE_LANGUAGE:C,CXX>:-DSWIFT_RUNTIME_CLOBBER_FREED_OBJECTS=$<BOOL:${SwiftCore_ENABLE_CLOBBER_FREED_OBJECTS}>>)
+  $<$<BOOL:${SwiftCore_ENABLE_CLOBBER_FREED_OBJECTS}>:-DSWIFT_RUNTIME_CLOBBER_FREED_OBJECTS>)
 
 add_compile_options(
   $<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>

Runtimes/Core/Concurrency/CMakeLists.txt

@@ -1,7 +1,7 @@
 add_subdirectory(InternalShims)
 
 gyb_expand(TaskGroup+addTask.swift.gyb TaskGroup+addTask.swift)
-gyb_expand(Task+startSynchronously.swift.gyb Task+startSynchronously.swift)
+gyb_expand(Task+immediate.swift.gyb Task+immediate.swift)
 
 add_library(swift_Concurrency
   Actor.cpp
@@ -12,6 +12,7 @@ add_library(swift_Concurrency
   EmbeddedSupport.cpp
   Error.cpp
   ExecutorBridge.cpp
+  ExecutorImpl.cpp
   ExecutorChecks.cpp
   GlobalExecutor.cpp
   Setup.cpp
@@ -80,6 +81,8 @@ add_library(swift_Concurrency
   PartialAsyncTask.swift
   PlatformExecutorDarwin.swift
   PlatformExecutorLinux.swift
+  PlatformExecutorFreeBSD.swift
+  PlatformExecutorOpenBSD.swift
   PlatformExecutorWindows.swift
   PriorityQueue.swift
   SourceCompatibilityShims.swift
@@ -94,7 +97,7 @@ add_library(swift_Concurrency
   TaskSleep.swift
   TaskSleepDuration.swift
   "${CMAKE_CURRENT_BINARY_DIR}/TaskGroup+addTask.swift"
-  "${CMAKE_CURRENT_BINARY_DIR}/Task+startSynchronously.swift")
+  "${CMAKE_CURRENT_BINARY_DIR}/Task+immediate.swift")
 
 include(${SwiftCore_CONCURRENCY_GLOBAL_EXECUTOR}.cmake)
 target_compile_definitions(swift_Concurrency PRIVATE
@@ -129,6 +132,10 @@ target_link_libraries(swift_Concurrency PRIVATE
 set_target_properties(swift_Concurrency PROPERTIES
   Swift_MODULE_NAME _Concurrency
   LINKER_LANGUAGE CXX)
+if(NOT BUILD_SHARED_LIBS AND CMAKE_STATIC_LIBRARY_PREFIX_Swift)
+  set_target_properties(swift_Concurrency PROPERTIES
+    PREFIX ${CMAKE_STATIC_LIBRARY_PREFIX_Swift})
+endif()
 
 install(TARGETS swift_Concurrency
   EXPORT SwiftCoreTargets

Runtimes/Core/cmake/modules/AvailabilityMacros.cmake

@@ -1,4 +1,7 @@
-file(STRINGS "${SwiftCore_SWIFTC_SOURCE_DIR}/utils/availability-macros.def" availability_defs)
+configure_file("${SwiftCore_SWIFTC_SOURCE_DIR}/utils/availability-macros.def"
+               "${CMAKE_CURRENT_BINARY_DIR}/availability-macros.def"
+               COPYONLY)
+file(STRINGS "${CMAKE_CURRENT_BINARY_DIR}/availability-macros.def" availability_defs)
 list(FILTER availability_defs EXCLUDE REGEX "^\\s*(#.*)?$")
 foreach(def ${availability_defs})
   add_compile_options("$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -define-availability -Xfrontend \"${def}\">")

Runtimes/Core/cmake/modules/EmitSwiftInterface.cmake

@@ -31,43 +31,3 @@ function(emit_swift_interface target)
       endif()
   endif()
 endfunction()
-
-# Install the generated swift interface file for the target if library evolution
-# is enabled.
-function(install_swift_interface target)
-  # Install binary swift modules
-  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
-    RENAME "${SwiftCore_MODULE_TRIPLE}.swiftmodule"
-    DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
-    COMPONENT SwiftCore_development)
-  if(SwiftCore_VARIANT_MODULE_TRIPLE)
-    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${target}-${SwiftCore_VARIANT_MODULE_TRIPLE}/${target}.swiftmodule"
-      RENAME "${SwiftCore_VARIANT_MODULE_TRIPLE}.swiftmodule"
-      DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
-      COMPONENT SwiftCore_development)
-  endif()
-
-  # Install Swift interfaces if library-evolution is enabled
-  if(SwiftCore_ENABLE_LIBRARY_EVOLUTION)
-    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftinterface"
-      RENAME "${SwiftCore_MODULE_TRIPLE}.swiftinterface"
-      DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
-      COMPONENT SwiftCore_development)
-    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.private.swiftinterface"
-      RENAME "${SwiftCore_MODULE_TRIPLE}.private.swiftinterface"
-      DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
-      COMPONENT SwiftCore_development)
-
-    # Install catalyst interface files
-    if(SwiftCore_VARIANT_MODULE_TRIPLE)
-      install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${target}-${SwiftCore_VARIANT_MODULE_TRIPLE}/${target}.swiftinterface"
-        RENAME "${SwiftCore_VARIANT_MODULE_TRIPLE}.swiftinterface"
-        DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
-        COMPONENT SwiftCore_development)
-      install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${target}-${SwiftCore_VARIANT_MODULE_TRIPLE}/${target}.private.swiftinterface"
-        RENAME "${SwiftCore_VARIANT_MODULE_TRIPLE}.private.swiftinterface"
-        DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule"
-        COMPONENT SwiftCore_development)
-    endif()
-  endif()
-endfunction()

Runtimes/Core/cmake/modules/ExperimentalFeatures.cmake

@@ -4,6 +4,7 @@ add_compile_options(
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature SE427NoInferenceOnExtension>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature NonescapableTypes>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature LifetimeDependence>"
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature LifetimeDependenceMutableAccessors>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature MemberImportVisibility>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature TypedThrows>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature Macros>"