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 namespace v8 { 32 namespace internal { 33 34 35 // Wrapper class for passing expected and actual parameter counts as 36 // either registers or immediate values. Used to make sure that the 37 // caller provides exactly the expected number of parameters to the 38 // callee. 39 class ParameterCount BASE_EMBEDDED { 40 public: 41 explicit ParameterCount(Register reg) 42 : reg_(reg), immediate_(0) { } 43 explicit ParameterCount(int immediate) 44 : reg_(no_reg), immediate_(immediate) { } 45 46 bool is_reg() const { return !reg_.is(no_reg); } 47 bool is_immediate() const { return !is_reg(); } 48 49 Register reg() const { 50 ASSERT(is_reg()); 51 return reg_; 52 } 53 int immediate() const { 54 ASSERT(is_immediate()); 55 return immediate_; 56 } 57 58 private: 59 const Register reg_; 60 const int immediate_; 61 62 DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount); 63 }; 64 65 66 } } // namespace v8::internal 67 68 #endif // V8_CODE_H_ 69
