First shot at source maps generation in dart2js.

lib/compiler/implementation/apiimpl.dart

 // Copyright (c) 2012, 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('leg_apiimpl');
 
 #import('dart:uri');
 
 #import('../compiler.dart', prefix: 'api');
 #import('leg.dart', prefix: 'leg');
@@ skipping 12 matching lines @@
   bool mockableLibraryUsed = false;
 
   Compiler(this.provider, this.handler, this.libraryRoot, this.packageRoot,
            List<String> options)
     : this.options = options,
       super(
           tracer: new ssa.HTracer(),
           enableTypeAssertions: options.indexOf('--enable-checked-mode') != -1,
           enableUserAssertions: options.indexOf('--enable-checked-mode') != -1,
           emitJavascript: options.indexOf('--output-type=dart') == -1,
-          validateUnparse: options.indexOf('--unparse-validation') !== -1);
+          validateUnparse: options.indexOf('--unparse-validation') !== -1,
+          generateSourceMap: options.some((e) => e.startsWith(

[ahe, 2012/06/20 11:56:59]

As discussed, we don't want to make it a command line option. So this should
just be true.

I think it is nice to keep the bool in the implementation, so it can be turned
off for debugging.

[podivilov, 2012/06/20 14:15:15]

Done.

+              '--source-map-out=')));
 
   elements.LibraryElement scanBuiltinLibrary(String path) {
     Uri uri = libraryRoot.resolve(DART2JS_LIBRARY_MAP[path]);
     elements.LibraryElement library = scanner.loadLibrary(uri, null);
     return library;
   }
 
   void log(message) {
     handler(null, null, null, message, api.Diagnostic.VERBOSE_INFO);
   }
@@ skipping 58 matching lines @@
       handler(translateUri(span.uri, null), span.begin, span.end,
               message, kind);
     }
   }
 
   bool get isMockCompilation() {
     return mockableLibraryUsed
       && (options.indexOf('--allow-mock-compilation') !== -1);
   }
 }