Add flag to disable hashing

R=sigmund@google.com

Review URL: https://codereview.chromium.org/1088703003

pkg/dev_compiler/lib/devc.dart

@@ -91,7 +91,7 @@ class Compiler {
  return new Compiler._(options, resolver, reporter, rules, checker, graph,
  entryNode, generators,
  // TODO(sigmund): refactor to support hashing of the dart output?
- options.serverMode && generators.length == 1 && !options.outputDart);
+ options.enableHashing && generators.length == 1 && !options.outputDart);
  }
 
  Compiler._(this._options, this._resolver, this._reporter, this._rules,

pkg/dev_compiler/lib/src/options.dart

@@ -151,6 +151,9 @@ class CompilerOptions implements RulesOptions, ResolverOptions, JSCodeOptions {
  /// Whether to run as a development server.
  final bool serverMode;
 
+ /// Whether to enable hash-based caching of files.
+ final bool enableHashing;
+
  /// Port used for the HTTP server when [serverMode] is on.
  final int port;
 
@@ -232,14 +235,18 @@ class CompilerOptions implements RulesOptions, ResolverOptions, JSCodeOptions {
  this.nonnullableTypes: TypeOptions.NONNULLABLE_TYPES, this.help: false,
  this.useMockSdk: false, this.dartSdkPath, this.logLevel: Level.SEVERE,
  this.emitSourceMaps: true, this.entryPointFile: null,
- this.serverMode: false, this.host: 'localhost', this.port: 8080,
- this.runtimeDir});
+ this.serverMode: false, this.enableHashing: false, this.host: 'localhost',
+ this.port: 8080, this.runtimeDir});
 }
 
 /// Parses options from the command-line
 CompilerOptions parseOptions(List<String> argv) {
  ArgResults args = argParser.parse(argv);
  var serverMode = args['server'];
+ var enableHashing = args['hashing'];
+ if (enableHashing == null) {
+ enableHashing = serverMode;
+ }
  var logLevel = serverMode ? Level.ALL : Level.SEVERE;
  var levelName = args['log'];
  if (levelName != null) {
@@ -294,6 +301,7 @@ CompilerOptions parseOptions(List<String> argv) {
  emitSourceMaps: args['source-maps'],
  entryPointFile: args.rest.length == 0 ? null : args.rest.first,
  serverMode: serverMode,
+ enableHashing: enableHashing,
  host: args['host'],
  port: int.parse(args['port']),
  runtimeDir: runtimeDir);
@@ -360,6 +368,8 @@ final ArgParser argParser = new ArgParser()
  // general options
  ..addFlag('help', abbr: 'h', help: 'Display this message')
  ..addFlag('server', help: 'Run as a development server.', defaultsTo: false)
+ ..addFlag('hashing',
+ help: 'Enable hash-based file caching.', defaultsTo: null)
  ..addOption('host',
  help: 'Host name or address to serve files from, e.g. --host=0.0.0.0\n'
  'to listen on all interfaces (used only when --serve is on)',

pkg/dev_compiler/test/codegen_test.dart

@@ -80,7 +80,8 @@ main(arguments) {
  entryPointFile: entryPoint,
  dartSdkPath: sdkPath,
  runtimeDir: runtimeDir,
- serverMode: serverMode);
+ serverMode: serverMode,
+ enableHashing: serverMode);
  return new Compiler(options).run();
  }
  var realSdk = getSdkDir(arguments).path;