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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2025 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
//
//===----------------------------------------------------------------------===//
public import SWBUtil
import SWBLibc
public import SWBCore
public final class SwiftHeaderToolTaskAction: TaskAction {
/// The parsed command line options.
private struct Options {
/// Whether the current target only supports a single architecture.
let single: Bool
/// The input architectures and file paths.
let inputs: [String: Path]
/// The output file path.
var output: Path
init(_ task: any ExecutableTask) throws {
let programName = "builtin-swiftHeaderTool"
let argsIter = task.commandLineAsStrings.makeIterator()
precondition(argsIter.next() == programName)
var single: Bool?
var inputs = [String: Path]()
var output: Path?
while true {
guard let arg = argsIter.next() else { break }
func absolutePath(_ path: Path) -> Path {
return path.isAbsolute ? path : task.workingDirectory.join(path)
}
func argParam() throws -> String {
guard let p = argsIter.next() else { throw StubError.error("Failed to parse arguments: \(arg) requires an argument") }
return p
}
func argParams(count: Int) throws -> [String] {
var args = [String]()
for _ in 0..<count {
guard let p = argsIter.next() else { throw StubError.error("Failed to parse arguments: \(arg) requires \(count) arguments") }
args.append(p)
}
return args
}
func setSingleOccurrence<T>(_ result: inout T?, _ getValue : @autoclosure () throws -> T) throws -> T {
guard result == nil else { throw StubError.error("Failed to parse arguments: expected a single \(arg) argument") }
let newResult = try getValue()
result = newResult
return newResult
}
switch arg {
case "-single":
single = try setSingleOccurrence(&single, true)
case "-arch":
let args = try argParams(count: 2)
let arch = args[0]
let path = args[1]
inputs[arch] = absolutePath(Path(path))
case "-o":
output = try setSingleOccurrence(&output, absolutePath(Path(argParam())))
default:
throw StubError.error("Unrecognized argument: \(arg)")
}
}
guard let out = output, inputs.count > 0 else {
throw StubError.error("usage: \(programName) [[-arch <arch> <input-file>] ...] -o <output-file>\n")
}
self.single = single ?? false
self.inputs = inputs
self.output = out
}
}
public override init() {
super.init()
}
override public class var toolIdentifier: String {
return "swift-header-tool"
}
override public func performTaskAction(
_ task: any ExecutableTask,
dynamicExecutionDelegate: any DynamicTaskExecutionDelegate,
executionDelegate: any TaskExecutionDelegate,
clientDelegate: any TaskExecutionClientDelegate,
outputDelegate: any TaskOutputDelegate
) async -> CommandResult {
do {
let options = try Options(task)
// If there's only a single architecture, don't add ifdefs.
if options.single {
if let path = options.inputs.values.only {
try executionDelegate.fs.write(options.output, contents: executionDelegate.fs.read(path))
return .succeeded
} else {
outputDelegate.emitError("Multiple architectures are not supported on this target.")
return .failed
}
}
// List of known archs and C preprocessor macros defined to '1' that indicate said archs.
// Order is important because some macros may be defined for multiple architectures.
//
// The third field describes the "baseline" architecture variant that generally works
// on a wider variety of processors but is otherwise ABI-compatible with the
// architecture listed, and can be linked against code built for the architecture
// listed. For example, code compiled as the baseline (x86_64) can build and link
// against libraries built for x86_64h.
let knownArchs = [
("arm64_32", "__ARM64_ARCH_8_32__", nil),
("arm64e", "__arm64e__", "arm64"),
("arm64", "__arm64__", nil),
("armv7k", "__ARM_ARCH_7K__", nil),
("armv7s", "__ARM_ARCH_7S__", nil),
("armv7", "__ARM_ARCH_7A__", nil),
("x86_64h", "__x86_64h__", "x86_64"),
("x86_64", "__x86_64__", nil),
("i386", "__i386__", nil)
]
let unknownArchs = Set(options.inputs.keys).subtracting(knownArchs.map { $0.0 })
if !unknownArchs.isEmpty {
throw StubError.error("Unsupported Swift architectures: \(unknownArchs.sorted().joined(separator: ", "))")
}
var byteString = ByteString(encodingAsUTF8: "#if 0\n")
for (arch, archMacro, baselineArchOpt) in knownArchs {
guard let path = options.inputs[arch] else { continue }
// When there exists a baseline architecture but there is no
// input for it, use the macro for the baseline architecture.
// By convention, it is always defined along with the macro
// for the more specialized architecture. To continue the
// x86-64 example above: if there is only x86_64h content but
// no x86_64 content, use the x86_64 macro (__x86_64__) to
// catch both cases. Otherwise, use the architecture macro
// given.
let macro: String
if let baseLineArch = baselineArchOpt, options.inputs[baseLineArch] == nil, let baseLineMacro = knownArchs.first(where: { $0.0 == baseLineArch })?.1 {
macro = baseLineMacro
} else {
macro = archMacro
}
byteString += ByteString(encodingAsUTF8: "#elif defined(\(macro)) && \(macro)\n")
byteString += try executionDelegate.fs.read(path) + "\n"
}
byteString += ByteString(encodingAsUTF8: "#else\n")
byteString += ByteString(encodingAsUTF8: "#error unsupported Swift architecture\n")
byteString += ByteString(encodingAsUTF8: "#endif\n")
try executionDelegate.fs.write(options.output, contents: byteString)
return .succeeded
} catch {
outputDelegate.emitError("\(error)")
return .failed
}
}
public override func serialize<T: Serializer>(to serializer: T) {
super.serialize(to: serializer)
}
public required init(from deserializer: any Deserializer) throws {
try super.init(from: deserializer)
}
}
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