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Alastair Houghton
81f477e4a7
Reorganise the thread locals for the backtracing code in the `Runtime` module so that there’s only one set of them, with everything else hanging off that. This also reduces code duplication and consumption of thread local variable space. Fix the `DefaultSymbolLocator`’s shared instance to be thread local. rdar://171432566
49 lines
1.5 KiB
Swift
49 lines
1.5 KiB
Swift
//===--- PeImageCache.swift - PE-COFF support for Swift -------------------===//
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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) 2024 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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// Provides a per-thread PE-COFF image cache that improves efficiency when
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// taking multiple backtraces by avoiding loading PE-COFF images multiple times.
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//
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//===----------------------------------------------------------------------===//
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import Swift
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/// Provides a per-thread image cache for PE-COFF image processing. This means
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/// if you take multiple backtraces from a thread, you won't load the same
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/// image multiple times.
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final class PeImageCache {
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var cache: [String: PeCoffImage] = [:]
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func purge() {
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cache = [:]
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}
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func lookup(path: String?) -> PeCoffImage? {
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guard let path = path else {
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return nil
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}
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if let image = cache[path] {
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return image
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}
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if let source = try? ImageSource(path: path),
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let image = try? PeCoffImage(source: source) {
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cache[path] = image
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return image
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}
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return nil
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}
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static var threadLocal: PeImageCache {
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return BacktracerThreadLocals.threadLocal.peImageCache
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}
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}
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