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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
64 lines
1.9 KiB
Swift
64 lines
1.9 KiB
Swift
//===--- ElfImageCache.swift - ELF 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 Elf image cache that improves efficiency when
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// taking multiple backtraces by avoiding loading ELF 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 ELF 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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@available(Backtracing 6.2, *)
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final class ElfImageCache {
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var elf32: [String: Elf32Image] = [:]
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var elf64: [String: Elf64Image] = [:]
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func purge() {
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elf32 = [:]
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elf64 = [:]
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}
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enum Result {
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case elf32Image(Elf32Image)
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case elf64Image(Elf64Image)
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}
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func lookup(path: String?) -> Result? {
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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 = elf32[path] {
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return .elf32Image(image)
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}
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if let image = elf64[path] {
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return .elf64Image(image)
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}
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if let source = try? ImageSource(path: path) {
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if let elfImage = try? Elf32Image(source: source) {
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elf32[path] = elfImage
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return .elf32Image(elfImage)
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}
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if let elfImage = try? Elf64Image(source: source) {
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elf64[path] = elfImage
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return .elf64Image(elfImage)
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}
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}
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return nil
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}
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static var threadLocal: ElfImageCache {
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return BacktracerThreadLocals.threadLocal.elfImageCache
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}
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}
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