Dart2js option to dump info about compilation

sdk/lib/_internal/compiler/implementation/js_backend/backend.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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 150 matching lines @@
 }
 
 
 class JavaScriptBackend extends Backend {
   SsaBuilderTask builder;
   SsaFromIrBuilderTask fromIrBuilder;
   SsaOptimizerTask optimizer;
   SsaCodeGeneratorTask generator;
   CodeEmitterTask emitter;
 
+  CodeBuffer emitCodeFor(Element element) {

[ahe, 2013/11/27 19:28:53]

This method is unfortunately named as emitting normally is something that the
emitter takes care of.

I'd simply call this codeOf(element).

Also, try to follow this class layout:

Fields,
Constructors,
Accessors,
Methods,

Sometimes we intermix accessors and fields, but it really hurts readability in
my opinion.

Generally, when you add a new method to a class group it with related stuff (non
I suspect in this case) or add it to the end.

[sigurdm, 2013/11/29 10:39:37]

ok
done

+    if (generatedCode.containsKey(element)) return null;
+    return jsAst.prettyPrint(generatedCode[element], compiler);
+  }
+
   /**
    * The generated code as a js AST for compiled methods.
    */
   Map<Element, jsAst.Expression> get generatedCode {
     return compiler.enqueuer.codegen.generatedCode;
   }
 
   FunctionInlineCache inlineCache = new FunctionInlineCache();
 
   ClassElement jsInterceptorClass;
@@ skipping 1814 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }