First simple implementation of for-of in TurboFan.

src/compiler/ast-graph-builder.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 771 matching lines @@
       }
       have_no_properties.End();
     }
     is_null.End();
   }
   is_undefined.End();
 }
 
 
 void AstGraphBuilder::VisitForOfStatement(ForOfStatement* stmt) {
-  VisitForValue(stmt->subject());
-  environment()->Pop();
-  // TODO(turbofan): create and use loop builder.
+  LoopBuilder for_loop(this);
+  VisitForEffect(stmt->assign_iterator());
+  for_loop.BeginLoop(GetVariablesAssignedInLoop(stmt), IsOsrLoopEntry(stmt));
+  VisitForEffect(stmt->next_result());
+  VisitForTest(stmt->result_done());
+  Node* condition = environment()->Pop();
+  for_loop.BreakWhen(condition);
+  VisitForEffect(stmt->assign_each());
+  VisitIterationBody(stmt, &for_loop, 0);
+  for_loop.EndBody();
+  for_loop.EndLoop();
 }
 
 
 void AstGraphBuilder::VisitTryCatchStatement(TryCatchStatement* stmt) {
   UNREACHABLE();
 }
 
 
 void AstGraphBuilder::VisitTryFinallyStatement(TryFinallyStatement* stmt) {
   UNREACHABLE();
@@ skipping 1430 matching lines @@
 
 BitVector* AstGraphBuilder::GetVariablesAssignedInLoop(
     IterationStatement* stmt) {
   if (loop_assignment_analysis_ == NULL) return NULL;
   return loop_assignment_analysis_->GetVariablesAssignedInLoop(stmt);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8