[Interpreter] Allocate registers used as call arguments on-demand.

src/interpreter/bytecode-generator.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_BYTECODE_GENERATOR_H_
 #define V8_INTERPRETER_BYTECODE_GENERATOR_H_
 
 #include "src/ast/ast.h"
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-label.h"
@@ skipping 54 matching lines @@
 
   // Dispatched from VisitUnaryOperation.
   void VisitVoid(UnaryOperation* expr);
   void VisitTypeOf(UnaryOperation* expr);
   void VisitNot(UnaryOperation* expr);
   void VisitDelete(UnaryOperation* expr);
 
   // Used by flow control routines to evaluate loop condition.
   void VisitCondition(Expression* expr);
 
-  // Visit the arguments expressions in |args| and store them in |args_regs|
-  // starting at register |first_argument_register| in the list.
-  void VisitArguments(ZoneList<Expression*>* args, RegisterList arg_regs,
-                      size_t first_argument_register = 0);
+  // Visit the arguments expressions in |args| and store them in |args_regs|,
+  // growing |args_regs| for each argument visited.
+  void VisitArguments(ZoneList<Expression*>* args, RegisterList* arg_regs);
 
   // Visit a keyed super property load. The optional
   // |opt_receiver_out| register will have the receiver stored to it
   // if it's a valid register. The loaded value is placed in the
   // accumulator.
   void VisitKeyedSuperPropertyLoad(Property* property,
                                    Register opt_receiver_out);
 
   // Visit a named super property load. The optional
   // |opt_receiver_out| register will have the receiver stored to it
   // if it's a valid register. The loaded value is placed in the
   // accumulator.
   void VisitNamedSuperPropertyLoad(Property* property,
                                    Register opt_receiver_out);
 
   void VisitPropertyLoad(Register obj, Property* expr);
-  void VisitPropertyLoadForAccumulator(Register obj, Property* expr);
+  void VisitPropertyLoadForRegister(Register obj, Property* expr,
+                                    Register destination);
 
   void BuildVariableLoad(Variable* variable, FeedbackVectorSlot slot,
                          HoleCheckMode hole_check_mode,
                          TypeofMode typeof_mode = NOT_INSIDE_TYPEOF);
   void BuildVariableLoadForAccumulatorValue(
       Variable* variable, FeedbackVectorSlot slot,
       HoleCheckMode hole_check_mode,
       TypeofMode typeof_mode = NOT_INSIDE_TYPEOF);
   void BuildVariableAssignment(Variable* variable, Token::Value op,
                                FeedbackVectorSlot slot,
@@ skipping 40 matching lines @@
   void VisitModuleNamespaceImports();
 
   // Visit the header/body of a loop iteration.
   void VisitIterationHeader(IterationStatement* stmt,
                             LoopBuilder* loop_builder);
   void VisitIterationBody(IterationStatement* stmt, LoopBuilder* loop_builder);
 
   // Visit a statement and switch scopes, the context is in the accumulator.
   void VisitInScope(Statement* stmt, Scope* scope);
 
+  void BuildPushUndefinedIntoRegisterList(RegisterList* reg_list);
+
   // Visitors for obtaining expression result in the accumulator, in a
   // register, or just getting the effect.
   void VisitForAccumulatorValue(Expression* expr);
   void VisitForAccumulatorValueOrTheHole(Expression* expr);
   MUST_USE_RESULT Register VisitForRegisterValue(Expression* expr);
   void VisitForRegisterValue(Expression* expr, Register destination);
+  void VisitAndPushIntoRegisterList(Expression* expr, RegisterList* reg_list);
   void VisitForEffect(Expression* expr);
   void VisitForTest(Expression* expr, BytecodeLabels* then_labels,
                     BytecodeLabels* else_labels, TestFallthrough fallthrough);
 
   // Returns the runtime function id for a store to super for the function's
   // language mode.
   inline Runtime::FunctionId StoreToSuperRuntimeId();
   inline Runtime::FunctionId StoreKeyedToSuperRuntimeId();
 
   inline BytecodeArrayBuilder* builder() const { return builder_; }
@@ skipping 51 matching lines @@
   Handle<Name> prototype_string_;
   Handle<FixedArray> empty_fixed_array_;
   const AstRawString* undefined_string_;
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_GENERATOR_H_