mutating func backendJob()

in Sources/SwiftDriver/Jobs/BackendJob.swift [16:81]
46 lines of code
3 McCabe index (conditional complexity)

  mutating func backendJob(input: TypedVirtualPath,
                           baseInput: TypedVirtualPath?,
                           addJobOutputs: ([TypedVirtualPath]) -> Void)
  throws -> Job {
    var commandLine: [Job.ArgTemplate] = swiftCompilerPrefixArgs.map { Job.ArgTemplate.flag($0) }
    var inputs = [TypedVirtualPath]()
    var outputs = [TypedVirtualPath]()

    commandLine.appendFlag("-frontend")
    addCompileModeOption(outputType: compilerOutputType, commandLine: &commandLine)

    // Add input arguments.
    commandLine.appendFlag(.primaryFile)
    commandLine.appendPath(input.file)
    inputs.append(input)

    commandLine.appendFlag(.embedBitcode)

    // -embed-bitcode only supports a restricted set of flags.
    commandLine.appendFlag(.target)
    commandLine.appendFlag(targetTriple.triple)

    // Enable address top-byte ignored in the ARM64 backend.
    if targetTriple.arch == .aarch64 {
      commandLine.appendFlag(.Xllvm)
      commandLine.appendFlag("-aarch64-use-tbi")
    }

    // Handle the CPU and its preferences.
    try commandLine.appendLast(.targetCpu, from: &parsedOptions)

    // Enable optimizations, but disable all LLVM-IR-level transformations.
    try commandLine.appendLast(in: .O, from: &parsedOptions)
    commandLine.appendFlag(.disableLlvmOptzns)

    try commandLine.appendLast(.parseStdlib, from: &parsedOptions)

    commandLine.appendFlag(.moduleName)
    commandLine.appendFlag(moduleOutputInfo.name)

    // Add the output file argument if necessary.
    if let compilerOutputType = compilerOutputType {
      // If there is no baseInput (singleCompileMode), primary output computation
      // is not input-specific, therefore it does not matter which input is passed.
      let output = computePrimaryOutput(for: baseInput ?? input,
                                        outputType: compilerOutputType,
                                        isTopLevel: isTopLevelOutput(type: compilerOutputType))
      commandLine.appendFlag(.o)
      commandLine.appendPath(output.file)
      outputs.append(output)
    }

    addJobOutputs(outputs)

    return Job(
      moduleName: moduleOutputInfo.name,
      kind: .backend,
      tool: .absolute(try toolchain.getToolPath(.swiftCompiler)),
      commandLine: commandLine,
      displayInputs: inputs,
      inputs: inputs,
      primaryInputs: [],
      outputs: outputs,
      supportsResponseFiles: true
    )
  }