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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SwiftExtensions
#if os(Windows)
import CRT
import WinSDK
#elseif os(iOS) || os(macOS) || os(tvOS) || os(watchOS)
import Darwin
#elseif canImport(Glibc)
import Glibc
#elseif canImport(Musl)
import Musl
#elseif canImport(Android)
import Android
#endif
package final class DLHandle: Sendable {
fileprivate struct Handle: @unchecked Sendable {
#if os(Windows)
let handle: HMODULE
#else
let handle: UnsafeMutableRawPointer
#endif
}
fileprivate let rawValue: ThreadSafeBox<Handle?>
fileprivate init(rawValue: Handle) {
self.rawValue = .init(initialValue: rawValue)
}
deinit {
precondition(rawValue.value == nil, "DLHandle must be closed or explicitly leaked before destroying")
}
/// The handle must not be used anymore after calling `close`.
package func close() throws {
try rawValue.withLock { rawValue in
if let handle = rawValue {
#if os(Windows)
guard FreeLibrary(handle.handle) else {
throw DLError.close("Failed to FreeLibrary: \(GetLastError())")
}
#else
guard dlclose(handle.handle) == 0 else {
throw DLError.close(dlerror() ?? "unknown error")
}
#endif
}
rawValue = nil
}
}
/// The handle must not be used anymore after calling `leak`.
package func leak() {
rawValue.value = nil
}
}
package struct DLOpenFlags: RawRepresentable, OptionSet, Sendable {
#if !os(Windows)
package static let lazy: DLOpenFlags = DLOpenFlags(rawValue: RTLD_LAZY)
package static let now: DLOpenFlags = DLOpenFlags(rawValue: RTLD_NOW)
package static let local: DLOpenFlags = DLOpenFlags(rawValue: RTLD_LOCAL)
package static let global: DLOpenFlags = DLOpenFlags(rawValue: RTLD_GLOBAL)
// Platform-specific flags.
#if os(macOS)
package static let first: DLOpenFlags = DLOpenFlags(rawValue: RTLD_FIRST)
#else
package static let first: DLOpenFlags = DLOpenFlags(rawValue: 0)
#endif
#endif
package var rawValue: Int32
package init(rawValue: Int32) {
self.rawValue = rawValue
}
}
package enum DLError: Swift.Error {
case `open`(String)
case close(String)
}
package func dlopen(_ path: String?, mode: DLOpenFlags) throws -> DLHandle {
#if os(Windows)
guard let handle = path?.withCString(encodedAs: UTF16.self, LoadLibraryW) else {
throw DLError.open("LoadLibraryW failed: \(GetLastError())")
}
#else
guard let handle = dlopen(path, mode.rawValue) else {
throw DLError.open(dlerror() ?? "unknown error")
}
#endif
return DLHandle(rawValue: DLHandle.Handle(handle: handle))
}
package func dlsym<T>(_ handle: DLHandle, symbol: String) -> T? {
#if os(Windows)
guard let ptr = GetProcAddress(handle.rawValue.value!.handle, symbol) else {
return nil
}
#else
guard let ptr = dlsym(handle.rawValue.value!.handle, symbol) else {
return nil
}
#endif
return unsafeBitCast(ptr, to: T.self)
}
package func dlclose(_ handle: DLHandle) throws {
try handle.close()
}
#if !os(Windows)
package func dlerror() -> String? {
if let err: UnsafeMutablePointer<Int8> = dlerror() {
return String(cString: err)
}
return nil
}
#endif
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