1// Copyright 2006-2008 the V8 project authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#ifndef V8_CODE_H_ 6#define V8_CODE_H_ 7 8#include "src/allocation.h" 9#include "src/handles.h" 10#include "src/objects.h" 11 12namespace v8 { 13namespace internal { 14 15 16// Wrapper class for passing expected and actual parameter counts as 17// either registers or immediate values. Used to make sure that the 18// caller provides exactly the expected number of parameters to the 19// callee. 20class ParameterCount BASE_EMBEDDED { 21 public: 22 explicit ParameterCount(Register reg) 23 : reg_(reg), immediate_(0) { } 24 explicit ParameterCount(int immediate) 25 : reg_(no_reg), immediate_(immediate) { } 26 explicit ParameterCount(Handle<JSFunction> f) 27 : reg_(no_reg), immediate_(f->shared()->formal_parameter_count()) { } 28 29 bool is_reg() const { return !reg_.is(no_reg); } 30 bool is_immediate() const { return !is_reg(); } 31 32 Register reg() const { 33 DCHECK(is_reg()); 34 return reg_; 35 } 36 int immediate() const { 37 DCHECK(is_immediate()); 38 return immediate_; 39 } 40 41 private: 42 const Register reg_; 43 const int immediate_; 44 45 DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount); 46}; 47 48 49} } // namespace v8::internal 50 51#endif // V8_CODE_H_ 52