tests for inlining between IR and AST functions

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

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
index 9151b71b64d9c5716c39bb68541acdd54f0cf6f0..73c4b5056e0686e69f36702368915e4bae86348e 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
@@ -107,6 +107,7 @@ class JavaScriptBackend extends Backend {
   ClassElement noSideEffectsClass;
   ClassElement noThrowsClass;
   ClassElement noInlineClass;
+  ClassElement irRepresentationClass;
 
   Element getInterceptorMethod;
   Element interceptedNames;
@@ -158,6 +159,18 @@ class JavaScriptBackend extends Backend {
    */
   final Map<String, Selector> oneShotInterceptors;
 
+  final Map<Element, bool> _enforceIrElements = <Element, bool>{};

[ngeoffray, 2013/12/17 12:52:33]

Because this is for testing: maybe do it lazily, in enforceIrRepresentation and
enforceAstRepresentation.

+
+  bool enforceIrRepresentation(Element element) {
+    // Testing [:== true:]is required because the lookup might return [:null:].
+    return _enforceIrElements[element] == true;
+  }
+
+  bool enforceAstRepresentation(Element element) {
+    // Testing [:== false:]is required because the lookup might return [:null:].
+    return _enforceIrElements[element] == false;
+  }
+
   /**
    * The members of instantiated interceptor classes: maps a member name to the
    * list of members that have that name. This map is used by the codegen to
@@ -521,6 +534,7 @@ class JavaScriptBackend extends Backend {
     noSideEffectsClass = compiler.findHelper('NoSideEffects');
     noThrowsClass = compiler.findHelper('NoThrows');
     noInlineClass = compiler.findHelper('NoInline');
+    irRepresentationClass = compiler.findHelper('IrRepresentation');
   }
 
   void validateInterceptorImplementsAllObjectMethods(
@@ -1794,6 +1808,10 @@ class JavaScriptBackend extends Backend {
           compiler.reportHere(element, "Has no side effects");
         }
         compiler.world.registerSideEffectsFree(element);
+      } else if (cls == irRepresentationClass) {

[ngeoffray, 2013/12/17 12:52:33]

Do it lazily?

[lukas, 2013/12/17 13:03:43]

Which part exactly? Note that the code is guarded by

  if (!library.isPlatformLibrary && !library.canUseNative) return;

+        ConstructedConstant classConstant = value;
+        BoolConstant constant = classConstant.fields[0];
+        _enforceIrElements[element] = constant.value;
       }
     }
     if (hasNoThrows && !hasNoInline) {