/
ArgsResolver.swift
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/
ArgsResolver.swift
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//===--------------- ArgsResolver.swift - Argument Resolution -------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 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 class Foundation.NSLock
import TSCBasic // <<<
import func TSCBasic.withTemporaryDirectory
import protocol TSCBasic.FileSystem
import struct TSCBasic.AbsolutePath
@_implementationOnly import Yams
/// How the resolver is to handle usage of response files
public enum ResponseFileHandling {
case forced
case disabled
case heuristic
}
/// Resolver for a job's argument template.
public final class ArgsResolver {
/// The map of virtual path to the actual path.
public var pathMapping: [VirtualPath: String]
/// The file system used by the resolver.
private let fileSystem: FileSystem
/// Path to the directory that will contain the temporary files.
// FIXME: We probably need a dedicated type for this...
private let temporaryDirectory: VirtualPath
private let lock = NSLock()
public init(fileSystem: FileSystem, temporaryDirectory: VirtualPath? = nil) throws {
self.pathMapping = [:]
self.fileSystem = fileSystem
if let temporaryDirectory = temporaryDirectory {
self.temporaryDirectory = temporaryDirectory
} else {
// FIXME: withTemporaryDirectory uses FileManager.default, need to create a FileSystem.temporaryDirectory api.
let tmpDir: AbsolutePath = try withTemporaryDirectory(removeTreeOnDeinit: false) { path in
// FIXME: TSC removes empty directories even when removeTreeOnDeinit is false. This seems like a bug.
try fileSystem.writeFileContents(path.appending(component: ".keep-directory")) { $0 <<< "" }
return path
}
self.temporaryDirectory = .absolute(tmpDir)
}
}
public func resolveArgumentList(for job: Job, useResponseFiles: ResponseFileHandling = .heuristic)
throws -> [String] {
let (arguments, _) = try resolveArgumentList(for: job, useResponseFiles: useResponseFiles)
return arguments
}
public func resolveArgumentList(for job: Job, useResponseFiles: ResponseFileHandling = .heuristic)
throws -> ([String], usingResponseFile: Bool) {
let tool = try resolve(.path(job.tool))
var arguments = [tool] + (try job.commandLine.map { try resolve($0) })
let usingResponseFile = try createResponseFileIfNeeded(for: job, resolvedArguments: &arguments,
useResponseFiles: useResponseFiles)
return (arguments, usingResponseFile)
}
@available(*, deprecated, message: "use resolveArgumentList(for:,useResponseFiles:,quotePaths:)")
public func resolveArgumentList(for job: Job, forceResponseFiles: Bool,
quotePaths: Bool = false) throws -> [String] {
let useResponseFiles: ResponseFileHandling = forceResponseFiles ? .forced : .heuristic
return try resolveArgumentList(for: job, useResponseFiles: useResponseFiles)
}
@available(*, deprecated, message: "use resolveArgumentList(for:,useResponseFiles:,quotePaths:)")
public func resolveArgumentList(for job: Job, forceResponseFiles: Bool,
quotePaths: Bool = false) throws -> ([String], usingResponseFile: Bool) {
let useResponseFiles: ResponseFileHandling = forceResponseFiles ? .forced : .heuristic
return try resolveArgumentList(for: job, useResponseFiles: useResponseFiles)
}
/// Resolve the given argument.
public func resolve(_ arg: Job.ArgTemplate) throws -> String {
switch arg {
case .flag(let flag):
return flag
case .path(let path):
return try lock.withLock {
return try unsafeResolve(path: path)
}
case .responseFilePath(let path):
return "@\(try resolve(.path(path)))"
case let .joinedOptionAndPath(option, path):
return option + (try resolve(.path(path)))
case let .squashedArgumentList(option: option, args: args):
return try option + args.map {
try resolve($0)
}.joined(separator: " ")
}
}
/// Needs to be done inside of `lock`. Marked unsafe to make that more obvious.
private func unsafeResolve(path: VirtualPath) throws -> String {
// If there was a path mapping, use it.
if let actualPath = pathMapping[path] {
return actualPath
}
// Return the path from the temporary directory if this is a temporary file.
if path.isTemporary {
let actualPath = temporaryDirectory.appending(component: path.name)
switch path {
case .temporary:
break // No special behavior required.
case let .temporaryWithKnownContents(_, contents):
// FIXME: Need a way to support this for distributed build systems...
if let absolutePath = actualPath.absolutePath {
try fileSystem.writeFileContents(absolutePath, bytes: .init(contents))
}
case let .fileList(_, .list(items)):
try createFileList(path: actualPath, contents: items)
case let .fileList(_, .outputFileMap(map)):
try createFileList(path: actualPath, outputFileMap: map)
case .relative, .absolute, .standardInput, .standardOutput:
fatalError("Not a temporary path.")
}
let result = actualPath.name
pathMapping[path] = result
return result
}
// Otherwise, return the path.
let result = path.name
pathMapping[path] = result
return result
}
private func createFileList(path: VirtualPath, contents: [VirtualPath]) throws {
// FIXME: Need a way to support this for distributed build systems...
if let absPath = path.absolutePath {
try fileSystem.writeFileContents(absPath) { out in
for path in contents {
try! out <<< unsafeResolve(path: path) <<< "\n"
}
}
}
}
private func createFileList(path: VirtualPath, outputFileMap: OutputFileMap)
throws {
// FIXME: Need a way to support this for distributed build systems...
if let absPath = path.absolutePath {
// This uses Yams to escape and quote strings, but not to output the whole yaml file because
// it sometimes outputs mappings in explicit block format (https://yaml.org/spec/1.2/spec.html#id2798057)
// and the frontend (llvm) only seems to support implicit block format.
try fileSystem.writeFileContents(absPath) { out in
for (input, map) in outputFileMap.entries {
out <<< quoteAndEscape(path: VirtualPath.lookup(input)) <<< ":"
if map.isEmpty {
out <<< " {}\n"
} else {
out <<< "\n"
for (type, output) in map {
out <<< " " <<< type.name <<< ": " <<< quoteAndEscape(path: VirtualPath.lookup(output)) <<< "\n"
}
}
}
}
}
}
private func quoteAndEscape(path: VirtualPath) -> String {
let inputNode = Node.scalar(Node.Scalar(try! unsafeResolve(path: path),
Tag(.str), .doubleQuoted))
// Width parameter of -1 sets preferred line-width to unlimited so that no extraneous
// line-breaks will be inserted during serialization.
let string = try! Yams.serialize(node: inputNode, width: -1)
// Remove the newline from the end
return string.trimmingCharacters(in: .whitespacesAndNewlines)
}
private func createResponseFileIfNeeded(for job: Job, resolvedArguments: inout [String], useResponseFiles: ResponseFileHandling) throws -> Bool {
func quote(_ string: String) -> String {
return "\"\(String(string.flatMap { ["\\", "\""].contains($0) ? "\\\($0)" : "\($0)" }))\""
}
guard useResponseFiles != .disabled else {
return false
}
let forceResponseFiles = useResponseFiles == .forced
if forceResponseFiles ||
(job.supportsResponseFiles && !commandLineFitsWithinSystemLimits(path: resolvedArguments[0], args: resolvedArguments)) {
assert(!forceResponseFiles || job.supportsResponseFiles,
"Platform does not support response files for job: \(job)")
// Match the integrated driver's behavior, which uses response file names of the form "arguments-[0-9a-zA-Z].resp".
let responseFilePath = temporaryDirectory.appending(component: "arguments-\(abs(job.hashValue)).resp")
// FIXME: Need a way to support this for distributed build systems...
if let absPath = responseFilePath.absolutePath {
// Adopt the same technique as clang -
// Wrap all arguments in double quotes to ensure that both Unix and
// Windows tools understand the response file.
try fileSystem.writeFileContents(absPath) {
$0 <<< resolvedArguments[1...].map { quote($0) }.joined(separator: "\n")
}
resolvedArguments = [resolvedArguments[0], "@\(absPath.pathString)"]
}
return true
}
return false
}
/// Remove the temporary directory from disk.
public func removeTemporaryDirectory() throws {
// Only try to remove if we have an absolute path.
if let absPath = temporaryDirectory.absolutePath {
try fileSystem.removeFileTree(absPath)
}
}
}
fileprivate extension NSLock {
/// NOTE: Keep in sync with SwiftPM's 'Sources/Basics/NSLock+Extensions.swift'
/// Execute the given block while holding the lock.
func withLock<T> (_ body: () throws -> T) rethrows -> T {
lock()
defer { unlock() }
return try body()
}
}