[Interpreter] Maintain the parent frame pointer after load

src/interpreter/interpreter-assembler.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_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 #define V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 
 #include "src/allocation.h"
 #include "src/base/smart-pointers.h"
 #include "src/builtins.h"
@@ skipping 141 matching lines @@
   // Returns the offset from the BytecodeArrayPointer of the current bytecode.
   compiler::Node* BytecodeOffset();
 
  protected:
   Bytecode bytecode() const { return bytecode_; }
   static bool TargetSupportsUnalignedAccess();
 
  private:
   // Returns a tagged pointer to the current function's BytecodeArray object.
   compiler::Node* BytecodeArrayTaggedPointer();
+
   // Returns a raw pointer to first entry in the interpreter dispatch table.
   compiler::Node* DispatchTableRawPointer();
 
   // Returns the accumulator value without checking whether bytecode
   // uses it. This is intended to be used only in dispatch and in
   // tracing as these need to bypass accumulator use validity checks.
   compiler::Node* GetAccumulatorUnchecked();
 
+  // Returns the frame pointer for the interpreted frame of the function being
+  // interpreted.
+  compiler::Node* GetInterpretedFramePointer();
+
   // Saves and restores interpreter bytecode offset to the interpreter stack
   // frame when performing a call.
   void CallPrologue() override;
   void CallEpilogue() override;
 
   // Increment the dispatch counter for the (current, next) bytecode pair.
   void TraceBytecodeDispatch(compiler::Node* target_index);
 
   // Traces the current bytecode by calling |function_id|.
   void TraceBytecode(Runtime::FunctionId function_id);
@@ skipping 46 matching lines @@
                                             compiler::Node* bytecode_offset);
 
   // Dispatch to the bytecode handler with code entry point |handler_entry|.
   compiler::Node* DispatchToBytecodeHandlerEntry(
       compiler::Node* handler_entry, compiler::Node* bytecode_offset);
 
   OperandScale operand_scale() const { return operand_scale_; }
 
   Bytecode bytecode_;
   OperandScale operand_scale_;
+  CodeStubAssembler::Variable interpreted_frame_pointer_;
   CodeStubAssembler::Variable accumulator_;
   AccumulatorUse accumulator_use_;
   bool made_call_;
 
   bool disable_stack_check_across_call_;
   compiler::Node* stack_pointer_before_call_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_