Move code for instantiating Invocation to Target.

pkg/front_end/lib/src/fasta/compiler_command_line.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.compiler_command_line;
 
 import 'dart:io' show exit;
 
 import 'command_line.dart' show CommandLine, argumentError;
 
 import 'compiler_context.dart' show CompilerContext;
 
 const Map<String, dynamic> optionSpecification = const <String, dynamic>{
   "--compile-sdk": Uri,
   "--fatal": ",",
   "--output": Uri,
   "--packages": Uri,
   "--platform": Uri,
   "-o": Uri,
+  "--target": String,
+  "-t": String,
 };
 
 class CompilerCommandLine extends CommandLine {
   final String programName;
 
   CompilerCommandLine(String programName, List<String> arguments)
       : programName = programName,
         super(arguments,
             specification: optionSpecification,
             usage: computeUsage(programName, false));
@@ skipping 13 matching lines @@
 
   void validate() {
     if (help) {
       print(computeUsage(programName, verbose));
       exit(0);
     }
 
     if (options.containsKey("-o") && options.containsKey("--output")) {
       return argumentError(usage, "Can't specify both '-o' and '--output'.");
     }
+    if (options.containsKey("-t") && options.containsKey("--target")) {
+      return argumentError(usage, "Can't specify both '-t' and '--target'.");
+    }
     if (programName == "compile_platform" && arguments.length != 3) {
       return argumentError(usage, "Expected three arguments.");
     } else if (arguments.isEmpty) {
       return argumentError(usage, "No Dart file specified.");
     }
   }
 
   Uri get output {
     return options["-o"] ?? options["--output"] ?? defaultOutput;
   }
@@ skipping 15 matching lines @@
   }
 
   bool get errorsAreFatal => fatal.contains("errors");
 
   bool get warningsAreFatal => fatal.contains("warnings");
 
   bool get nitsAreFatal => fatal.contains("nits");
 
   bool get strongMode => options.containsKey("--strong-mode");
 
+  String get target {
+    return options["-t"] ?? options["--target"] ?? "vm";
+  }
+
   static dynamic withGlobalOptions(String programName, List<String> arguments,
       dynamic f(CompilerContext context)) {
     return CompilerContext.withGlobalOptions(
         new CompilerCommandLine(programName, arguments), f);
   }
 
   static CompilerCommandLine forRootContext() {
     return new CompilerCommandLine("", [""]);
   }
 }
@@ skipping 60 matching lines @@
     file names or arguments to the Dart program.
 
   --packages=<file>
     Use package resolution configuration <file>, which should contain a mapping
     of package names to paths.
 
   --platform=<file>
     Read the SDK platform from <file>, which should be in Dill/Kernel IR format
     and contain the Dart SDK.
 
+  --target=none|vm|vmcc|vmreify|flutter
+    Specify the target configuration.
+
   --verify
     Check that the generated output is free of various problems. This is mostly
     useful for developers of this compiler or Kernel transformations.
 
   --dump-ir
     Print compiled libraries in Kernel source notation.
 
   --exclude-source
     Do not include source code in the dill file.
 
   --compile-sdk=<patched_sdk>
     Compile the SDK from scratch instead of reading it from 'platform.dill'.
 
   --fatal=errors
   --fatal=warnings
   --fatal=nits
     Makes messages of the given kinds fatal, that is, immediately stop the
     compiler with a non-zero exit-code. In --verbose mode, also display an
     internal stack trace from the compiler. Multiple kinds can be separated by
     commas, for example, --fatal=errors,warnings.
 """;