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[embedded] Start building Synchronization in embedded Swift mode
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‎docs/EmbeddedSwift/EmbeddedSwiftStatus.md

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@@ -48,6 +48,7 @@ This status table describes which of the following Swift features can be used in
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| **Swift Feature** | **Currently Supported In Embedded Swift?** |
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|------------------------------------------------------------|-----------------------------------------------------|
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| Synchronization module | Yes |
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| Swift Concurrency | Partial, experimental (basics of actors and tasks work in single-threaded concurrency mode) |
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| C interop | Yes |
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| C++ interop | Yes |

‎docs/EmbeddedSwift/UserManual.md

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@@ -197,6 +197,7 @@ For (2), external dependencies are also triggered by specific code needing them,
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- **atomics instrinsics**
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- on CPU architectures that don't have direct load-acquire/store-release support in the ISA, LLVM calls helper functions for atomic operations
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- needed by refcounting in the Embedded Swift runtime (so any class usage will trigger this dependency)
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- also needed when using atomics from the Synchronization module
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- **multiplication/division/modulo instrinsics**
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- on CPU architectures that don't have direct support for the math operations in the ISA
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- dependency (on Mach-O): `__divti3`

‎stdlib/public/CMakeLists.txt

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@@ -206,8 +206,8 @@ if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB)
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"x86_64 x86_64-unknown-none-elf x86_64-unknown-none-elf"
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# Without specifying the `windows` component LLVM refuses to
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# generate valid COFF object files.
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"i686 i686-unknown-windows-coff i686-unknown-windows-coff"
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"x86_64 x86_64-unknown-windows-coff x86_64-unknown-windows-coff"
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"i686 i686-unknown-windows-msvc i686-unknown-windows-msvc"
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"x86_64 x86_64-unknown-windows-msvc x86_64-unknown-windows-msvc"
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)
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endif()
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‎stdlib/public/Synchronization/AtomicMemoryOrderings.swift

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@@ -96,6 +96,7 @@ extension AtomicLoadOrdering: Hashable {
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}
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@available(SwiftStdlib 6.0, *)
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@_unavailableInEmbedded
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extension AtomicLoadOrdering: CustomStringConvertible {
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@available(SwiftStdlib 6.0, *)
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public var description: String {
@@ -191,6 +192,7 @@ extension AtomicStoreOrdering: Hashable {
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}
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@available(SwiftStdlib 6.0, *)
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@_unavailableInEmbedded
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extension AtomicStoreOrdering: CustomStringConvertible {
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@available(SwiftStdlib 6.0, *)
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public var description: String {
@@ -315,6 +317,7 @@ extension AtomicUpdateOrdering: Hashable {
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}
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@available(SwiftStdlib 6.0, *)
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@_unavailableInEmbedded
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extension AtomicUpdateOrdering: CustomStringConvertible {
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@available(SwiftStdlib 6.0, *)
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public var description: String {

‎stdlib/public/Synchronization/CMakeLists.txt

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@@ -10,8 +10,7 @@
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#
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#===----------------------------------------------------------------------===#
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add_swift_target_library(swiftSynchronization ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_STDLIB
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# List of files here:
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set(swift_synchronization_sources
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Atomic.swift
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AtomicBool.swift
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AtomicFloats.swift
@@ -21,23 +20,67 @@ add_swift_target_library(swiftSynchronization ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES
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AtomicPointers.swift
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AtomicRepresentable.swift
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WordPair.swift
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)
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set(swift_synchronization_gyb_sources
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AtomicIntegers.swift.gyb
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AtomicStorage.swift.gyb
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)
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set(swift_synchronization_swift_compile_flags
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${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
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"-enable-builtin-module"
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"-enable-experimental-feature" "RawLayout"
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"-enable-experimental-feature" "StaticExclusiveOnly"
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)
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GYB_SOURCES
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AtomicIntegers.swift.gyb
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AtomicStorage.swift.gyb
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SWIFT_COMPILE_FLAGS
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${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
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"-enable-builtin-module"
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"-enable-experimental-feature" "RawLayout"
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"-enable-experimental-feature" "StaticExclusiveOnly"
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add_swift_target_library(swiftSynchronization ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_STDLIB
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${swift_synchronization_sources}
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GYB_SOURCES ${swift_synchronization_gyb_sources}
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SWIFT_COMPILE_FLAGS ${swift_synchronization_swift_compile_flags}
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LINK_FLAGS
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"${SWIFT_RUNTIME_SWIFT_LINK_FLAGS}"
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INSTALL_IN_COMPONENT
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stdlib
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MACCATALYST_BUILD_FLAVOR
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"zippered"
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)
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# Embedded Synchronization - embedded libraries are built as .swiftmodule only,
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# i.e. there is no .o or .a file produced (no binary code is actually produced)
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# and only users of a library are going to actually compile any needed code.
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if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB)
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add_custom_target(embedded-synchronization ALL)
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foreach(entry ${EMBEDDED_STDLIB_TARGET_TRIPLES})
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string(REGEX REPLACE "[ \t]+" ";" list "${entry}")
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list(GET list 0 arch)
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list(GET list 1 mod)
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list(GET list 2 triple)
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set(SWIFT_SDK_embedded_ARCH_${arch}_MODULE "${mod}")
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set(SWIFT_SDK_embedded_LIB_SUBDIR "embedded")
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set(SWIFT_SDK_embedded_ARCH_${arch}_TRIPLE "${triple}")
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set(SWIFT_SDK_embedded_PATH ${SWIFT_SDK_OSX_PATH})
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set(SWIFT_SDK_embedded_ARCH_${arch}_PATH ${SWIFT_SDK_OSX_PATH})
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set(SWIFT_SDK_embedded_USE_ISYSROOT TRUE)
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add_swift_target_library_single(
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embedded-synchronization-${mod}
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swiftSynchronization
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ONLY_SWIFTMODULE
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IS_FRAGILE
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${swift_synchronization_sources}
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GYB_SOURCES ${swift_synchronization_gyb_sources}
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SWIFT_COMPILE_FLAGS
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${swift_synchronization_swift_compile_flags}
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-Xcc -D__MACH__ -Xcc -D__APPLE__ -Xcc -ffreestanding -enable-experimental-feature Embedded
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MODULE_DIR "${CMAKE_BINARY_DIR}/lib/swift/embedded"
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SDK "embedded"
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ARCHITECTURE "${arch}"
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DEPENDS embedded-stdlib-${mod}
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INSTALL_IN_COMPONENT stdlib
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)
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add_dependencies(embedded-synchronization embedded-synchronization-${mod})
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endforeach()
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endif()

‎stdlib/public/Synchronization/WordPair.swift

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@@ -184,6 +184,7 @@ extension WordPair: Hashable {
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}
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@available(SwiftStdlib 6.0, *)
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@_unavailableInEmbedded
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extension WordPair: CustomStringConvertible {
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/// A string that represents the contents of the word pair.
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@available(SwiftStdlib 6.0, *)
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@available(SwiftStdlib 6.0, *)
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@_unavailableInEmbedded
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extension WordPair: CustomDebugStringConvertible {
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/// A string that represents the contents of the word pair, suitable for
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/// debugging.

‎stdlib/public/core/CMakeLists.txt

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@@ -411,9 +411,6 @@ add_swift_target_library(swiftCore
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# Embedded standard library - embedded libraries are built as .swiftmodule only,
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# i.e. there is no .o or .a file produced (no binary code is actually produced)
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# and only users of a library are going to actually compile any needed code.
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#
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# For now, we build a hardcoded list of target triples of the embedded stdlib,
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# and only when building Swift on macOS.
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if(SWIFT_SHOULD_BUILD_EMBEDDED_STDLIB)
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add_custom_target(embedded-stdlib ALL)
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‎test/embedded/synchronization.swift

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// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend %s -parse-as-library -enable-experimental-feature Embedded -disable-availability-checking -c -o %t/main.o
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// RUN: %target-clang %t/main.o -o %t/a.out -dead_strip
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// RUN: %target-run %t/a.out | %FileCheck %s
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// REQUIRES: swift_in_compiler
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// REQUIRES: executable_test
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// REQUIRES: optimized_stdlib
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// REQUIRES: OS=macosx || OS=linux-gnu
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import Synchronization
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@main
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struct Main {
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static let x = Atomic(128)
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static func main() {
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let old = x.load(ordering: .relaxed)
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x.store(42, ordering: .relaxed)
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let new = x.load(ordering: .relaxed)
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print(old) // CHECK: 128
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print(new) // CHECK: 42
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let old2 = x.exchange(12, ordering: .acquiring)
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print(old2) // CHECK: 42
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let (exchanged, original) = x.compareExchange(expected: 128, desired: 316, ordering: .sequentiallyConsistent)
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print(exchanged) // CHECK: false
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print(original) // CHECK: 12
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let (exchanged2, original2) = x.compareExchange(expected: 12, desired: 316, ordering: .sequentiallyConsistent)
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print(exchanged2) // CHECK: true
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print(original2) // CHECK: 12
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}
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}

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