Add logs around various exits

Author: bnbarham

Sources/swift-driver/main.swift

@@ -155,30 +155,41 @@ do {
   // FIXME: The following check should be at the end of Driver.init, but current
   // usage of the DiagnosticVerifier in tests makes this difficult.
   guard !driver.diagnosticEngine.hasErrors else {
+    print("DRIVER EXTRA VERBOSE HAD ERRORS")
     throw Driver.ErrorDiagnostics.emitted
   }
 
+  print("DRIVER EXTRA VERBOSE STARTING PLANNING")
   let jobs = try driver.planBuild()
+  print("DRIVER EXTRA VERBOSE FINISHED PLANNING")
 
   // Planning may result in further errors emitted
   // due to dependency scanning failures.
   guard !driver.diagnosticEngine.hasErrors else {
+    print("DRIVER EXTRA VERBOSE HAD ERRORS")
     throw Driver.ErrorDiagnostics.emitted
   }
 
+  print("DRIVER EXTRA VERBOSE RUNNING JOBS")
   try driver.run(jobs: jobs)
+  print("DRIVER EXTRA VERBOSE FINISHED JOBS")
 
   if driver.diagnosticEngine.hasErrors {
+    print("DRIVER EXTRA VERBOSE HAD ERRORS")
     exit(getExitCode(EXIT_FAILURE))
   }
 
+  print("DRIVER EXTRA VERBOSE SUCCESS")
   exit(getExitCode(0))
 } catch let diagnosticData as DiagnosticData {
+  print("DRIVER EXTRA VERBOSE IN CATCH FOR DIAGNOSTIC EMISSION")
   diagnosticsEngine.emit(.error(diagnosticData))
   exit(getExitCode(EXIT_FAILURE))
 } catch Driver.ErrorDiagnostics.emitted {
+  print("DRIVER EXTRA VERBOSE IN CATCH FOR ALREADY EMITTED DIAGNOSTICS")
   exit(getExitCode(EXIT_FAILURE))
 } catch {
+  print("DRIVER EXTRA VERBOSE IN CATCH FOR OTHER ERROR")
   print("error: \(error)")
   exit(getExitCode(EXIT_FAILURE))
 }