[Interpreter] Move context chain search loop to handler

src/interpreter/interpreter.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_H_
 #define V8_INTERPRETER_INTERPRETER_H_
 
 #include <memory>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
@@ skipping 118 matching lines @@
                 InterpreterAssembler* assembler);
 
   // Generates code to perform a lookup slot load via |function_id|.
   void DoLdaLookupSlot(Runtime::FunctionId function_id,
                        InterpreterAssembler* assembler);
 
   // Generates code to perform a lookup slot store depending on |language_mode|.
   void DoStaLookupSlot(LanguageMode language_mode,
                        InterpreterAssembler* assembler);
 
+  // Generates code to get a context at a given |depth| from the given
+  // |root_context|.

[Michael Starzinger, 2016/09/13 09:53:08]

nit: The name "root_context" sounds misleading because "root" sounds as it would
be the end of the chain (i.e. the native context). Please just use plain
"context" for the variable/parameter name instead. This is in sync with the rest
of the code.

[Leszek Swirski, 2016/09/13 10:17:51]

Done (actually, this was a leftover definition from a refactor, so removed
entirely).

+  compiler::Node* GetContextAtDepth(InterpreterAssembler* assembler,
+                                    compiler::Node* root_context,
+                                    compiler::Node* depth);
+
   // Generates code to load a context slot.
   compiler::Node* BuildLoadContextSlot(InterpreterAssembler* assembler);
 
   // Generates code to load a global.
   compiler::Node* BuildLoadGlobal(Callable ic, InterpreterAssembler* assembler);
 
   // Generates code to load a named property.
   compiler::Node* BuildLoadNamedProperty(Callable ic,
                                          InterpreterAssembler* assembler);
 
@@ skipping 31 matching lines @@
   std::unique_ptr<uintptr_t[]> bytecode_dispatch_counters_table_;
 
   DISALLOW_COPY_AND_ASSIGN(Interpreter);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_H_