[interpreter] Create custom call opcodes for specific argument counts

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 60 matching lines @@
 
  private:
 // Bytecode handler generator functions.
 #define DECLARE_BYTECODE_HANDLER_GENERATOR(Name, ...) \
   void Do##Name(InterpreterAssembler* assembler);
   BYTECODE_LIST(DECLARE_BYTECODE_HANDLER_GENERATOR)
 #undef DECLARE_BYTECODE_HANDLER_GENERATOR
 
   typedef void (Interpreter::*BytecodeGeneratorFunc)(InterpreterAssembler*);
 
+  // In the case of bytecodes that share handler implementations, copy the code
+  // into the bytecode's dispatcher table entry and return true.
+  bool ReuseExistingHandler(Bytecode bytecode, OperandScale operand_scale);
+
   // Generates handler for given |bytecode| and |operand_scale| using
   // |generator| and installs it into the dispatch table.
   void InstallBytecodeHandler(Zone* zone, Bytecode bytecode,
                               OperandScale operand_scale,
                               BytecodeGeneratorFunc generator);
 
   // Generates code to perform the binary operation via |Generator|.
   template <class Generator>
   void DoBinaryOpWithFeedback(InterpreterAssembler* assembler);
 
@@ skipping 26 matching lines @@
 
   // Generates code to perform a named property store via |ic|.
   void DoStoreIC(Callable ic, InterpreterAssembler* assembler);
 
   // Generates code to perform a keyed property store via |ic|.
   void DoKeyedStoreIC(Callable ic, InterpreterAssembler* assembler);
 
   // Generates code to perform a JS call that collects type feedback.
   void DoJSCall(InterpreterAssembler* assembler, TailCallMode tail_call_mode);
 
+  // Generates code to perform a JS call with a known number of arguments that
+  // collects type feedback.
+  void DoJSCallN(InterpreterAssembler* assembler, int n);
+
   // Generates code to perform delete via function_id.
   void DoDelete(Runtime::FunctionId function_id,
                 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 load via |function_id| that can
   // fast path to a context slot load.
@@ skipping 50 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_