First simple implementation of for-of in TurboFan.

src/ast-numbering.cc

Index: src/ast-numbering.cc
diff --git a/src/ast-numbering.cc b/src/ast-numbering.cc
index c2dd70e1bbe75086a0de3e9097aac6d2b3dc49c1..784e605d747822f7814a993478d9868884e0c51f 100644
--- a/src/ast-numbering.cc
+++ b/src/ast-numbering.cc
@@ -47,10 +47,10 @@ class AstNumberingVisitor FINAL : public AstVisitor {
   void IncrementNodeCount() { properties_.add_node_count(1); }
   void DisableCrankshaft(BailoutReason reason) {
     dont_crankshaft_reason_ = reason;
-    properties_.flags()->Add(kDontSelfOptimize);
+    DisableSelfOptimization();
   }
   // TODO(turbofan): Remove the dont_turbofan_reason once no nodes are
-  // DontTurbofanNode.  That set of nodes must be kept in sync with
+  // DisableTurbofan.  That set of nodes must be kept in sync with
   // Pipeline::GenerateCode.
   void DisableTurbofan(BailoutReason reason) {
     dont_crankshaft_reason_ = reason;
@@ -390,7 +390,7 @@ void AstNumberingVisitor::VisitForInStatement(ForInStatement* node) {
 
 void AstNumberingVisitor::VisitForOfStatement(ForOfStatement* node) {
   IncrementNodeCount();
-  DisableTurbofan(kForOfStatement);
+  DisableCrankshaft(kForOfStatement);

[adamk, 2015/01/13 19:02:36]

Does this mean that any function that happens to use for-of will now get
TurboFan-compiled (when optimized) instead of of Crankshafted?

[Michael Starzinger, 2015/01/13 19:28:01]

Not yet, there are two things missing. First you would need to pass
--turbo-filter=* to enable that. Second there still needs to be some adaptation
to the compilation pipeline (i.e. the mess in the compiler.cc file that nobody
wants to touch with a stick) to make this work reliably.

   node->set_base_id(ReserveIdRange(ForOfStatement::num_ids()));
   Visit(node->assign_iterator());
   Visit(node->next_result());