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//===------------------------ SwiftScan.swift -----------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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 protocol Foundation.CustomNSError
import var Foundation.NSLocalizedDescriptionKey
#if os(Windows)
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
internal enum Loader {
}
extension Loader {
internal enum Error: Swift.Error {
case `open`(String)
case close(String)
}
}
extension Loader.Error: CustomNSError {
public var errorUserInfo: [String:Any] {
return [NSLocalizedDescriptionKey: "\(self)"]
}
}
#if !os(Windows)
extension Loader {
private static func error() -> String? {
if let error: UnsafeMutablePointer<CChar> = dlerror() {
return String(cString: error)
}
return nil
}
}
#endif
extension Loader {
internal final class Handle {
#if os(Windows)
typealias ValueType = HMODULE
#else
typealias ValueType = UnsafeMutableRawPointer
#endif
fileprivate var value: ValueType?
init(value: ValueType) {
self.value = value
}
deinit {
precondition(value == nil,
"Handle must be closed or explicitly leaked before deinit")
}
public func close() throws {
if let handle = self.value {
#if os(Windows)
guard FreeLibrary(handle) else {
throw Loader.Error.close("FreeLibrary failure: \(GetLastError())")
}
#else
guard dlclose(handle) == 0 else {
throw Loader.Error.close(Loader.error() ?? "unknown error")
}
#endif
}
self.value = nil
}
public func leak() {
self.value = nil
}
}
}
extension Loader {
internal struct Flags: RawRepresentable, OptionSet {
public var rawValue: Int32
public init(rawValue: Int32) {
self.rawValue = rawValue
}
}
}
#if !os(Windows)
extension Loader.Flags {
public static var lazy: Loader.Flags {
Loader.Flags(rawValue: RTLD_LAZY)
}
public static var now: Loader.Flags {
Loader.Flags(rawValue: RTLD_NOW)
}
public static var local: Loader.Flags {
Loader.Flags(rawValue: RTLD_LOCAL)
}
public static var global: Loader.Flags {
Loader.Flags(rawValue: RTLD_GLOBAL)
}
// Platform-specific flags
#if os(iOS) || os(macOS) || os(tvOS) || os(watchOS)
public static var first: Loader.Flags {
Loader.Flags(rawValue: RTLD_FIRST)
}
public static var deepBind: Loader.Flags {
Loader.Flags(rawValue: 0)
}
#else
public static var first: Loader.Flags {
Loader.Flags(rawValue: 0)
}
#if os(Linux) && canImport(Glibc)
public static var deepBind: Loader.Flags {
Loader.Flags(rawValue: RTLD_DEEPBIND)
}
#else
public static var deepBind: Loader.Flags {
Loader.Flags(rawValue: 0)
}
#endif
#endif
}
#endif
extension Loader {
public static func load(_ path: String?, mode: Flags) throws -> Handle {
#if os(Windows)
guard let handle = path?.withCString(encodedAs: UTF16.self, LoadLibraryW) else {
throw Loader.Error.open("LoadLibraryW failure: \(GetLastError())")
}
#else
guard let handle = dlopen(path, mode.rawValue) else {
throw Loader.Error.open(Loader.error() ?? "unknown error")
}
#endif
return Handle(value: handle)
}
public static func lookup<T>(symbol: String, in module: Handle) -> T? {
#if os(Windows)
guard let pointer = GetProcAddress(module.value!, symbol) else {
return nil
}
#else
guard let pointer = dlsym(module.value!, symbol) else {
return nil
}
#endif
return unsafeBitCast(pointer, to: T.self)
}
public static func unload(_ handle: Handle) throws {
try handle.close()
}
}
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