Put the type feedback vector in the unoptimized JavaScript frame.

src/arm/macro-assembler-arm.h

 // Copyright 2012 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_ARM_MACRO_ASSEMBLER_ARM_H_
 #define V8_ARM_MACRO_ASSEMBLER_ARM_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 1410 matching lines @@
     TestJSArrayForAllocationMemento(receiver_reg, scratch_reg,
                                     &no_memento_found);
     b(eq, memento_found);
     bind(&no_memento_found);
   }
 
   // Jumps to found label if a prototype map has dictionary elements.
   void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0,
                                         Register scratch1, Label* found);
 
+  // OSR needs to adjust locals on the stack down one word over the vector.
+  void OSRDropVectorFromStack(int unoptimized_slot_count, Register scratch0,

[titzer, 2015/02/24 19:32:55]

I think this method should have a more generic name that suggests what it does.
In particular the name suggests that it only drops something from the stack,
while it in fact copies part of the stack.

Maybe "AdaptUnoptimizeFrameForOsrEntry"?

[mvstanton, 2015/03/20 12:21:09]

Good point, and good name. I've changed to AdaptUnoptimizedFrameForOsrEntry.

+                              Register scratch1);
+
  private:
   void CallCFunctionHelper(Register function,
                            int num_reg_arguments,
                            int num_double_arguments);
 
   void Jump(intptr_t target, RelocInfo::Mode rmode, Condition cond = al);
 
   // Helper functions for generating invokes.
   void InvokePrologue(const ParameterCount& expected,
                       const ParameterCount& actual,
@@ skipping 103 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_