Emit constants using ASTs

sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
index ba5a9d942b1601a124e8965b402ca29ff86d88c6..f7d7de8f41daecb45ac1e3dcc5ab55cc36dc92c3 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/emitter.dart
@@ -81,13 +81,17 @@ class CodeEmitterTask extends CompilerTask {
     });
   }
 
-  void writeConstantToBuffer(Constant value, CodeBuffer buffer,
-                             {emitCanonicalVersion: true}) {
-    if (emitCanonicalVersion) {
-      constantEmitter.emitCanonicalVersionOfConstant(value, buffer);
-    } else {
-      constantEmitter.emitJavaScriptCodeForConstant(value, buffer);
-    }
+  js.Expression constantReference(Constant value) {
+    return constantEmitter.reference(value);
+  }
+
+  js.Expression constantInitializerExpression(Constant value) {
+    return constantEmitter.initializationExpression(value);
+  }
+
+  // Deprecated.  Remove after last use is converted to JS ASTs.
+  void writeConstantToBuffer(Constant value, CodeBuffer buffer) {
+    buffer.add(js.prettyPrint(constantReference(value), compiler));
   }
 
   String get name => 'CodeEmitter';
@@ -1319,12 +1323,17 @@ $classesCollector.$mangledName = {'':
     List<VariableElement> staticNonFinalFields =
         handler.getStaticNonFinalFieldsForEmission();
     for (Element element in staticNonFinalFields) {
-      buffer.add('$isolateProperties.${namer.getName(element)} = ');
       compiler.withCurrentElement(element, () {
-          Constant initialValue = handler.getInitialValueFor(element);
-          writeConstantToBuffer(initialValue, buffer);
-        });
-      buffer.add(';\n');
+        Constant initialValue = handler.getInitialValueFor(element);
+        js.Expression init =
+            new js.Assignment(
+                new js.PropertyAccess.field(
+                    new js.VariableUse(isolateProperties),
+                    namer.getName(element)),
+                constantEmitter.referenceInInitializationContext(initialValue));
+        buffer.add(js.prettyPrint(init, compiler));
+        buffer.add(';\n');
+      });
     }
   }
 
@@ -1382,8 +1391,13 @@ $classesCollector.$mangledName = {'':
         addedMakeConstantList = true;
         emitMakeConstantList(buffer);
       }
-      buffer.add('$isolateProperties.$name = ');
-      writeConstantToBuffer(constant, buffer, emitCanonicalVersion: false);
+      js.Expression init =
+          new js.Assignment(
+              new js.PropertyAccess.field(
+                  new js.VariableUse(isolateProperties),
+                  name),
+              constantInitializerExpression(constant));
+      buffer.add(js.prettyPrint(init, compiler));
       buffer.add(';\n');
     }
   }