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https://github.com/apple/swift.git
synced 2026-06-20 15:42:51 +02:00
Alastair Houghton
c432e9df61
We need a minimum target of 15.7 or below because of CI, so add a new `BacktracingDT 6.2` define. This is a bit of a hack for now to unblock CI upgrades; we can go and clean things up and perhaps generalise this mechanism later. rdar://172129091
80 lines
2.4 KiB
Swift
80 lines
2.4 KiB
Swift
//===--- BacktracerThreadLocals.swift - TLS for Swift Backtracer ----------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2026 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Holds thread-local storage for the Swift Backtracer
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//
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//===----------------------------------------------------------------------===//
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import Swift
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#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
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internal import Darwin
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#elseif os(Windows)
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internal import WinSDK
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#elseif canImport(Glibc)
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internal import Glibc
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#elseif canImport(Musl)
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internal import Musl
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#endif
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@available(BacktracingDT 6.2, *)
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final class BacktracerThreadLocals {
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lazy var elfImageCache = ElfImageCache()
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lazy var peImageCache = PeImageCache()
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lazy var defaultSymbolLocator = DefaultSymbolLocator()
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#if os(Windows)
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private static var dwTlsIndex: DWORD = {
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let dwNdx = TlsAlloc()
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if dwNdx == TLS_OUT_OF_INDEXES {
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fatalError("Unable to allocate TSD for backtracer thread locals")
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}
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return dwNdx
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}()
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#else
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private static var key: pthread_key_t = {
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var theKey = pthread_key_t()
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let err = pthread_key_create(
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&theKey,
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{ rawPtr in
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let ptr = Unmanaged<PeImageCache>.fromOpaque(
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notMutable(notOptional(rawPtr))
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)
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ptr.release()
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}
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)
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if err != 0 {
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fatalError("Unable to create TSD key for backtracer thread locals")
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}
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return theKey
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}()
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#endif
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static var threadLocal: BacktracerThreadLocals {
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#if os(Windows)
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guard let rawPtr = TlsGetValue(dwTlsIndex) else {
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let locals = Unmanaged<BacktracerThreadLocals>.passRetained(BacktracerThreadLocals())
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TlsSetValue(dwTlsIndex, locals.toOpaque())
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return locals.takeUnretainedValue()
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}
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#else
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guard let rawPtr = pthread_getspecific(key) else {
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let locals = Unmanaged<BacktracerThreadLocals>.passRetained(BacktracerThreadLocals())
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pthread_setspecific(key, locals.toOpaque())
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return locals.takeUnretainedValue()
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}
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#endif
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let locals = Unmanaged<BacktracerThreadLocals>.fromOpaque(rawPtr)
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return locals.takeUnretainedValue()
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}
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}
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