First version of the new generators implementation.

src/interpreter/bytecode-generator.h

Index: src/interpreter/bytecode-generator.h
diff --git a/src/interpreter/bytecode-generator.h b/src/interpreter/bytecode-generator.h
index 4ef173890c0e880d0adbf63fcd48821dd31ec077..d5fc45f3e8ce4a19f8e7e9ca8534f8df764c2e12 100644
--- a/src/interpreter/bytecode-generator.h
+++ b/src/interpreter/bytecode-generator.h
@@ -109,6 +109,8 @@ class BytecodeGenerator final : public AstVisitor {
   void BuildHoleCheckForVariableLoad(VariableMode mode, Handle<String> name);
   void BuildHoleCheckForVariableAssignment(Variable* variable, Token::Value op);
 
+  void BuildGeneratorPrologue();

[rmcilroy, 2016/04/15 13:17:46]

nit - We've been a bit inconsistent with Visit vs. Build, but I think
VisitGeneratorPrologue is probably more appropriate here.

[neis, 2016/04/18 08:04:17]

Done.

+
   void VisitArgumentsObject(Variable* variable);
   void VisitRestArgumentsArray(Variable* rest);
   void VisitCallSuper(Call* call);
@@ -204,8 +206,10 @@ class BytecodeGenerator final : public AstVisitor {
   ContextScope* execution_context_;
   ExpressionResultScope* execution_result_;
   RegisterAllocationScope* register_allocator_;
+  ZoneVector<BytecodeLabel> resume_points_;  // For generator functions.

[rmcilroy, 2016/04/15 13:17:46]

just generator_resume_points_, then you don't need to comment?

[neis, 2016/04/18 08:04:17]

Done.

   int try_catch_nesting_level_;
   int try_finally_nesting_level_;
+  int yield_count_;  // For generator functions: number of yields seen so far.

[rmcilroy, 2016/04/15 13:17:46]

ditto?

[neis, 2016/04/18 08:04:17]

Done.

 };
 
 }  // namespace interpreter