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[Macros] Add 'LibraryPluginProvider'
LibraryPluginProvider is a 'PluginProvider' type that can load shared library plugins at runtime.
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Sources/SwiftCompilerPluginMessageHandling/LibraryPluginProvider.swift
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//===----------------------------------------------------------------------===// | ||
// | ||
// This source file is part of the Swift open source project | ||
// | ||
// Copyright (c) 2023 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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import SwiftSyntaxMacros | ||
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#if canImport(Darwin) | ||
import Darwin | ||
#elseif canImport(Glibc) | ||
import Glibc | ||
#elseif canImport(WinSDK) | ||
import WinSDK | ||
#endif | ||
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private struct LibraryPluginError: Error, CustomStringConvertible { | ||
var description: String | ||
init(message: String) { | ||
self.description = message | ||
} | ||
} | ||
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/// `LibraryPluginProvider` is a singleton `PluginProvider` that can load shared | ||
/// library macro plugins in the process. | ||
@_spi(Compiler) | ||
public class LibraryPluginProvider: PluginProvider { | ||
private struct LoadedLibraryPlugin { | ||
var libraryPath: String | ||
var handle: UnsafeMutableRawPointer | ||
} | ||
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private struct MacroRef: Hashable { | ||
var moduleName: String | ||
var typeName: String | ||
} | ||
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/// Loaded dylib handles associated with the module name. | ||
private var loadedLibraryPlugins: [String: LoadedLibraryPlugin] = [:] | ||
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/// Resolved cached macros. | ||
private var resolvedMacros: [MacroRef: Macro.Type] = [:] | ||
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private init() {} | ||
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public static let shared: LibraryPluginProvider = LibraryPluginProvider() | ||
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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 _dlopen(libraryPath) | ||
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loadedLibraryPlugins[moduleName] = LoadedLibraryPlugin( | ||
libraryPath: libraryPath, | ||
handle: dlHandle | ||
) | ||
} | ||
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public func resolveMacro(moduleName: String, typeName: String) throws -> 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 unless the | ||
// plugin loading succeeded. | ||
throw LibraryPluginError(message: "plugin not loaded for module '\(moduleName)'") | ||
} | ||
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// Lookup the type by name. | ||
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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/// This 'PluginProvider' implements 'loadLibraryMacro()'. | ||
public var features: [PluginFeature] { | ||
[.loadPluginLibrary] | ||
} | ||
} | ||
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private func _dlopen(_ path: String) throws -> UnsafeMutableRawPointer { | ||
#if canImport(Darwin) || canImport(Glibc) | ||
if let dlHandle = dlopen(path, RTLD_LAZY | RTLD_LOCAL) { | ||
return dlHandle | ||
} | ||
throw LibraryPluginError(message: "loader error: \(String(cString: dlerror()))") | ||
#elseif canImport(WinSDK) | ||
if let dlHandle = LoadLibraryA(path) { | ||
return UnsafeMutableRawPointer(dlHandle) | ||
} | ||
// FIXME: Format the error code to string. | ||
throw LibraryPluginError(message: "loader error: \(GetLastError())") | ||
#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 | ||
} |