1// Copyright 2006-2008 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_CODE_H_ 29#define V8_CODE_H_ 30 31#include "allocation.h" 32#include "handles.h" 33#include "objects.h" 34 35namespace v8 { 36namespace internal { 37 38 39// Wrapper class for passing expected and actual parameter counts as 40// either registers or immediate values. Used to make sure that the 41// caller provides exactly the expected number of parameters to the 42// callee. 43class ParameterCount BASE_EMBEDDED { 44 public: 45 explicit ParameterCount(Register reg) 46 : reg_(reg), immediate_(0) { } 47 explicit ParameterCount(int immediate) 48 : reg_(no_reg), immediate_(immediate) { } 49 explicit ParameterCount(Handle<JSFunction> f) 50 : reg_(no_reg), immediate_(f->shared()->formal_parameter_count()) { } 51 52 bool is_reg() const { return !reg_.is(no_reg); } 53 bool is_immediate() const { return !is_reg(); } 54 55 Register reg() const { 56 ASSERT(is_reg()); 57 return reg_; 58 } 59 int immediate() const { 60 ASSERT(is_immediate()); 61 return immediate_; 62 } 63 64 private: 65 const Register reg_; 66 const int immediate_; 67 68 DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount); 69}; 70 71 72} } // namespace v8::internal 73 74#endif // V8_CODE_H_ 75