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[Macros] Add 'LibraryPluginProvider'
LibraryPluginProvider is a 'PluginProvider' type that can load shared library plugins at runtime.
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# This source file is part of the Swift.org open source project | ||
# | ||
# Copyright (c) 2024 Apple Inc. and the Swift project authors | ||
# Licensed under Apache License v2.0 with Runtime Library Exception | ||
# | ||
# See http://swift.org/LICENSE.txt for license information | ||
# See http://swift.org/CONTRIBUTORS.txt for Swift project authors | ||
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add_swift_syntax_library(SwiftLibraryPluginProvider | ||
LibraryPluginProvider.swift | ||
) | ||
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target_link_swift_syntax_libraries(SwiftLibraryPluginProvider PUBLIC | ||
SwiftSyntaxMacros | ||
SwiftCompilerPluginMessageHandling | ||
) |
204 changes: 204 additions & 0 deletions
204
Sources/SwiftLibraryPluginProvider/LibraryPluginProvider.swift
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//===----------------------------------------------------------------------===// | ||
// | ||
// This source file is part of the Swift open source project | ||
// | ||
// Copyright (c) 2024 Apple Inc. and the Swift project authors | ||
// Licensed under Apache License v2.0 with Runtime Library Exception | ||
// | ||
// See http://swift.org/LICENSE.txt for license information | ||
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#if swift(>=6.0) | ||
public import SwiftSyntaxMacros | ||
@_spi(PluginMessage) public import SwiftCompilerPluginMessageHandling | ||
// NOTE: Do not use '_' | ||
#if canImport(Darwin) | ||
private import Darwin | ||
#elseif canImport(Glibc) | ||
private import Glibc | ||
#elseif canImport(Musl) | ||
private import Musl | ||
#elseif canImport(WinSDK) | ||
private import WinSDK | ||
#endif | ||
#else | ||
import SwiftSyntaxMacros | ||
@_spi(PluginMessage) import SwiftCompilerPluginMessageHandling | ||
#if canImport(Darwin) | ||
@_implementationOnly import Darwin | ||
#elseif canImport(Glibc) | ||
@_implementationOnly import Glibc | ||
#elseif canImport(Musl) | ||
@_implementationOnly import Musl | ||
#elseif canImport(WinSDK) | ||
@_implementationOnly import WinSDK | ||
#endif | ||
#endif | ||
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/// Singleton 'PluginProvider' that can serve shared library plugins. | ||
@_spi(PluginMessage) | ||
public class LibraryPluginProvider: PluginProvider { | ||
struct LoadedLibraryPlugin { | ||
var libraryPath: String | ||
var handle: UnsafeMutableRawPointer | ||
} | ||
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struct MacroRef: Hashable { | ||
var moduleName: String | ||
var typeName: String | ||
} | ||
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/// Loaded dynamic link library handles associated with the module name. | ||
var loadedLibraryPlugins: [String: LoadedLibraryPlugin] = [:] | ||
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/// Resolved macros cache. | ||
var resolvedMacros: [MacroRef: Macro.Type] = [:] | ||
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private init() {} | ||
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/// Singleton. | ||
@MainActor | ||
public static let shared: LibraryPluginProvider = LibraryPluginProvider() | ||
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public var features: [PluginFeature] { | ||
[.loadPluginLibrary] | ||
} | ||
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public func loadPluginLibrary(libraryPath: String, moduleName: String) throws { | ||
if let loaded = loadedLibraryPlugins[moduleName] { | ||
guard loaded.libraryPath == libraryPath else { | ||
// NOTE: Should be unreachable. Compiler should not load different | ||
// library for the same module name. | ||
throw LibraryPluginError( | ||
message: | ||
"library plugin for module '\(moduleName)' is already loaded from different path '\(loaded.libraryPath)'" | ||
) | ||
} | ||
return | ||
} | ||
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let dlHandle = try _loadLibrary(libraryPath) | ||
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loadedLibraryPlugins[moduleName] = LoadedLibraryPlugin( | ||
libraryPath: libraryPath, | ||
handle: dlHandle | ||
) | ||
} | ||
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public func resolveMacro(moduleName: String, typeName: String) throws -> SwiftSyntaxMacros.Macro.Type { | ||
let macroRef = MacroRef(moduleName: moduleName, typeName: typeName) | ||
if let resolved = resolvedMacros[macroRef] { | ||
return resolved | ||
} | ||
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// Find 'dlopen'ed library for the module name. | ||
guard let plugin = loadedLibraryPlugins[moduleName] else { | ||
// NOTE: Should be unreachable. Compiler should not use this server | ||
// unless the plugin loading succeeded. | ||
throw LibraryPluginError(message: "plugin not loaded for module '\(moduleName)'") | ||
} | ||
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// Lookup the type metadata. | ||
guard let type = _findAnyType(moduleName, typeName) else { | ||
throw LibraryPluginError( | ||
message: "type '\(moduleName).\(typeName)' could not be found in library plugin '\(plugin.libraryPath)'" | ||
) | ||
} | ||
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// The type must be a 'Macro' type. | ||
guard let macro = type as? Macro.Type else { | ||
throw LibraryPluginError( | ||
message: | ||
"type '\(moduleName).\(typeName)' is not a valid macro implementation type in library plugin '\(plugin.libraryPath)'" | ||
) | ||
} | ||
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// Cache the resolved type. | ||
resolvedMacros[macroRef] = macro | ||
return macro | ||
} | ||
} | ||
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#if os(Windows) | ||
private func _loadLibrary(_ path: String) throws -> UnsafeMutableRawPointer { | ||
// Create NUL terminated UTF16 path. | ||
let utf16Path = UnsafeMutableBufferPointer<UInt16>.allocate(capacity: path.utf16.count + 1) | ||
defer { utf16Path.deallocate() } | ||
let end = utf16Path.initialize(fromContentsOf: path.utf16) | ||
utf16Path.initializeElement(at: end, to: 0) | ||
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if let dlHandle = LoadLibraryW(utf16Path.baseAddress) { | ||
return UnsafeMutableRawPointer(dlHandle) | ||
} | ||
// FIXME: Format the error code to string. | ||
throw LibraryPluginError(message: "loader error: \(GetLastError())") | ||
} | ||
#else | ||
private func _loadLibrary(_ path: String) throws -> UnsafeMutableRawPointer { | ||
if let dlHandle = dlopen(path, RTLD_LAZY | RTLD_LOCAL) { | ||
return dlHandle | ||
} | ||
throw LibraryPluginError(message: "loader error: \(String(cString: dlerror()))") | ||
} | ||
#endif | ||
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private func _findAnyType(_ moduleName: String, _ typeName: String) -> Any.Type? { | ||
// Create a mangled name for struct, enum, and class. And use a runtime | ||
// function to find the type. Note that this simple mangling works even if the | ||
// actual symbol name doesn't match with it. i.e. We don't need to perform | ||
// punycode encodings or word substitutions. | ||
// FIXME: This is process global. Can we limit it to a specific .dylib ? | ||
for suffix in [ /*struct*/"V", /*enum*/ "O", /*class*/ "C"] { | ||
let mangled = "\(moduleName.utf8.count)\(moduleName)\(typeName.utf8.count)\(typeName)\(suffix)" | ||
if let type = _typeByName(mangled) { | ||
return type | ||
} | ||
} | ||
return nil | ||
} | ||
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private struct LibraryPluginError: Error, CustomStringConvertible { | ||
var description: String | ||
init(message: String) { | ||
self.description = message | ||
} | ||
} | ||
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// Compatibility shim for SE-0370 | ||
#if swift(<5.8) | ||
extension UnsafeMutableBufferPointer { | ||
private func initialize( | ||
fromContentsOf source: some Collection<Element> | ||
) -> Index { | ||
let count = source.withContiguousStorageIfAvailable { | ||
guard let sourceAddress = $0.baseAddress, !$0.isEmpty else { | ||
return 0 | ||
} | ||
precondition( | ||
$0.count <= self.count, | ||
"buffer cannot contain every element from source." | ||
) | ||
baseAddress?.initialize(from: sourceAddress, count: $0.count) | ||
return $0.count | ||
} | ||
if let count { | ||
return startIndex.advanced(by: count) | ||
} | ||
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var (iterator, copied) = self.initialize(from: source) | ||
precondition( | ||
iterator.next() == nil, | ||
"buffer cannot contain every element from source." | ||
) | ||
return startIndex.advanced(by: copied) | ||
} | ||
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private func initializeElement(at index: Index, to value: Element) { | ||
precondition(startIndex <= index && index < endIndex) | ||
let p = baseAddress!.advanced(by: index) | ||
p.initialize(to: value) | ||
} | ||
} | ||
#endif |
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