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Dynamically look up backtrace(3) on Android. #1356

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Dynamically look up backtrace(3) on Android. #1356

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16 changes: 13 additions & 3 deletions Sources/Testing/SourceAttribution/Backtrace.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,16 @@ public struct Backtrace: Sendable {
self.addresses = addresses.map { Address(UInt(bitPattern: $0)) }
}

#if os(Android) && !SWT_NO_DYNAMIC_LINKING
/// The `backtrace()` function.
///
/// This function was added to Android with API level 33, which is higher than
/// our minimum deployment target, so we look it up dynamically at runtime.
private static let _backtrace = symbol(named: "backtrace").map {
castCFunction(at: $0, to: (@convention(c) (UnsafeMutablePointer<UnsafeMutableRawPointer?>, CInt) -> CInt).self)
}
#endif

/// Get the current backtrace.
///
/// - Parameters:
Expand All @@ -66,9 +76,9 @@ public struct Backtrace: Sendable {
initializedCount = .init(clamping: backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
}
#elseif os(Android)
initializedCount = addresses.withMemoryRebound(to: UnsafeMutableRawPointer.self) { addresses in
.init(clamping: backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
}
#if !SWT_NO_DYNAMIC_LINKING
initializedCount = .init(clamping: _backtrace?(addresses.baseAddress!, .init(clamping: addresses.count)))
#endif
#elseif os(Linux) || os(FreeBSD) || os(OpenBSD)
initializedCount = .init(clamping: backtrace(addresses.baseAddress!, .init(clamping: addresses.count)))
#elseif os(Windows)
Expand Down