Merge pull request #2765 from apple/integrated-driver-descriptions

[Integrated driver] Adopt new driver APIs for descriptions.

Author: DougGregor

Sources/Build/ManifestBuilder.swift

@@ -209,77 +209,15 @@ extension LLBuildManifestBuilder {
 
             for job in jobs {
                 let tool = try resolver.resolve(.path(job.tool))
-                let isSwiftFrontend: Bool
-                switch job.kind {
-                case .compile, .mergeModule, .emitModule, .generatePCH,
-                    .generatePCM, .interpret, .repl, .printTargetInfo,
-                    .versionRequest, .backend:
-                    isSwiftFrontend = true
-
-                case .autolinkExtract, .generateDSYM, .help, .link, .verifyDebugInfo:
-                    isSwiftFrontend = false
-                }
-
                 let commandLine = try job.commandLine.map{ try resolver.resolve($0) }
                 let arguments = [tool] + commandLine
 
                 let jobInputs = job.inputs.map { $0.resolveToNode() }
                 let jobOutputs = job.outputs.map { $0.resolveToNode() }
 
-                // Compute a description for this particular job. The output
-                // is intended to match that of the built-in Swift compiler
-                // tool so that the use of the integrated driver is mostly
-                // an implementation detail.
                 let moduleName = target.target.c99name
-                let description: String
-                switch job.kind {
-                case .compile:
-                    description = "Compiling \(moduleName) \(job.displayInputs.first?.file.name ?? "")"
-
-                case .mergeModule:
-                    description = "Merging module \(moduleName)"
-
-                case .link:
-                    description = "Linking \(moduleName)"
-
-                case .generateDSYM:
-                    description = "Generating dSYM for module \(moduleName)"
-
-                case .autolinkExtract:
-                    description = "Extracting autolink information for module \(moduleName)"
-
-                case .emitModule:
-                    description = "Emitting module for \(moduleName)"
-
-                case .generatePCH:
-                    description = "Compiling bridging header \(job.displayInputs.first!.file.name)"
-
-                case .generatePCM:
-                    description = "Compiling Clang module \(job.displayInputs.first!.file.name)"
-
-                case .interpret:
-                    description = "Interpreting \(job.displayInputs.first!.file.name)"
-
-                case .repl:
-                    description = "Executing Swift REPL"
-
-                case .verifyDebugInfo:
-                    description = "Verifying debug information for module \(moduleName)"
-
-                case .printTargetInfo:
-                    description = "Gathering target information for module \(moduleName)"
-
-                case .versionRequest:
-                    description = "Getting Swift version information"
-
-                case .help:
-                    description = "Swift help"
-
-                case .backend:
-                  description = "Embedding bitcode for \(moduleName)"
-                }
-
-                if isSwiftFrontend {
+                let description = job.description
+                if job.kind.isSwiftFrontend {
                     manifest.addSwiftFrontendCmd(
                         name: jobOutputs.first!.name,
                         moduleName: moduleName,