[generators] Store the resume mode in the generator object.

src/objects.h

 // Copyright 2015 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 7295 matching lines @@
 
   // [context]: The context of the suspended computation.
   DECL_ACCESSORS(context, Context)
 
   // [receiver]: The receiver of the suspended computation.
   DECL_ACCESSORS(receiver, Object)
 
   // [input]: The most recent input value.
   DECL_ACCESSORS(input, Object)
 
+  // [resume_mode]: The most recent resume mode.
+  enum ResumeMode { kNext, kReturn, kThrow };
+  DECL_INT_ACCESSORS(resume_mode)
+
   // [continuation]: Offset into code of continuation.
   //
   // A positive offset indicates a suspended generator.  The special
   // kGeneratorExecuting and kGeneratorClosed values indicate that a generator
   // cannot be resumed.
   inline int continuation() const;
   inline void set_continuation(int continuation);
   inline bool is_closed();
   inline bool is_executing();
   inline bool is_suspended();
 
   // [operand_stack]: Saved operand stack.
   DECL_ACCESSORS(operand_stack, FixedArray)
 
   DECLARE_CAST(JSGeneratorObject)
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSGeneratorObject)
   DECLARE_VERIFIER(JSGeneratorObject)
 
   // Magic sentinel values for the continuation.
   static const int kGeneratorExecuting = -1;
   static const int kGeneratorClosed = 0;
 
   // Layout description.
   static const int kFunctionOffset = JSObject::kHeaderSize;
   static const int kContextOffset = kFunctionOffset + kPointerSize;
   static const int kReceiverOffset = kContextOffset + kPointerSize;
   static const int kInputOffset = kReceiverOffset + kPointerSize;
-  static const int kContinuationOffset = kInputOffset + kPointerSize;
+  static const int kResumeModeOffset = kInputOffset + kPointerSize;
+  static const int kContinuationOffset = kResumeModeOffset + kPointerSize;
   static const int kOperandStackOffset = kContinuationOffset + kPointerSize;
   static const int kSize = kOperandStackOffset + kPointerSize;
 
-  // Resume mode, for use by runtime functions.
-  enum ResumeMode { kNext, kReturn, kThrow };
-
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGeneratorObject);
 };
 
 
 // Representation for module instance objects.
 class JSModule: public JSObject {
  public:
   // [context]: the context holding the module's locals, or undefined if none.
   DECL_ACCESSORS(context, Object)
@@ skipping 3398 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_