dart2js: First part of native support in the new emitter.

pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
index f3e8bafb7e0842f72d1a3535deb2654985f1e279..b40e20d1db69b4ee462cfe9330740967bdef8a92 100644
--- a/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/new_emitter/model_emitter.dart
@@ -17,6 +17,7 @@ import 'package:_internal/compiler/js_lib/shared/embedded_names.dart' show
     INITIALIZE_LOADED_HUNK,
     IS_HUNK_LOADED;
 
+import '../js_emitter.dart' show NativeGenerator;
 import '../model.dart';
 
 class ModelEmitter {
@@ -38,6 +39,11 @@ class ModelEmitter {
         constantEmitter =
             new ConstantEmitter(compiler, namer, makeConstantListTemplate);
 
+  js.Expression generateEmbeddedGlobalAccess(String global) {
+    // TODO(floitsch): We should not use "init" for globals.
+    return js.js("init.$global");
+  }
+
   void emitProgram(Program program) {
     List<Output> outputs = program.outputs;
     MainOutput mainUnit = outputs.first;
@@ -75,7 +81,20 @@ class ModelEmitter {
     List<js.Expression> elements = unit.libraries.map(emitLibrary).toList();
     elements.add(
         emitLazilyInitializedStatics(unit.staticLazilyInitializedFields));
+
+    js.Statement nativeBoilerplate;
+    if (NativeGenerator.needsBoilerplate(backend)) {
+      nativeBoilerplate = NativeGenerator.generateBoilerplate(
+          backend,
+          generateEmbeddedGlobalAccess,
+          // TODO(floitsch): convertToFastObject.
+          js.js("(function(x) { return x; })", []));
+    } else {
+      nativeBoilerplate = js.js.statement(";");
+    }
+
     js.Expression code = new js.ArrayInitializer(elements);
+
     return js.js.statement(
         boilerplate,

[sra1, 2015/01/05 20:14:23]

Use the uncached version unless you are sure that 'boilerplate' contains only
one of a finite number of strings.

[floitsch, 2015/01/06 12:54:57]

Boilerplate is a big string at the bottom of the file.
Am I missing something?

[sra1, 2015/01/07 04:43:28]

My bad.  I thought it was computed.
If it is a constant, give it a constant-like name.

[floitsch, 2015/01/07 13:11:46]

what's a constant-like name?
I wanted to use capitals but the editor is even warning me now...

         {'deferredInitializer': emitDeferredInitializerGlobal(program.loadMap),
@@ -86,6 +105,7 @@ class ModelEmitter {
          'embeddedGlobals': emitEmbeddedGlobals(program.loadMap),
          'constants': emitConstants(unit.constants),
          'staticNonFinals': emitStaticNonFinalFields(unit.staticNonFinalFields),
+         'nativeBoilerplate': nativeBoilerplate,
          'eagerClasses': emitEagerClassInitializations(unit.libraries),
          'main': unit.main,
          'code': code});
@@ -130,8 +150,6 @@ class ModelEmitter {
       globals.add(emitInitializeLoadedHunk());
     }
 
-    if (globals.isEmpty) return new js.Block.empty();
-
     js.ObjectInitializer globalsObject = new js.ObjectInitializer(globals);
 
     List<js.Statement> statements =
@@ -539,6 +557,9 @@ class ModelEmitter {
   // Initialize static non-final fields.
   #staticNonFinals;
 
+  // Add native boilerplate code.
+  #nativeBoilerplate;
+
   // Initialize eager classes.
   #eagerClasses;