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 12 namespace v8 { 13 namespace 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. 20 class ParameterCount BASE_EMBEDDED { 21 public: ParameterCount(Register reg)22 explicit ParameterCount(Register reg) 23 : reg_(reg), immediate_(0) { } ParameterCount(int immediate)24 explicit ParameterCount(int immediate) 25 : reg_(no_reg), immediate_(immediate) { } ParameterCount(Handle<JSFunction> f)26 explicit ParameterCount(Handle<JSFunction> f) 27 : reg_(no_reg), immediate_(f->shared()->formal_parameter_count()) { } 28 is_reg()29 bool is_reg() const { return !reg_.is(no_reg); } is_immediate()30 bool is_immediate() const { return !is_reg(); } 31 reg()32 Register reg() const { 33 DCHECK(is_reg()); 34 return reg_; 35 } immediate()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