sc_buffer.hh revision 13205
1/* 2 * Copyright 2018 Google, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 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 copyright 9 * notice, this list of conditions and the following disclaimer in the 10 * documentation and/or other materials provided with the distribution; 11 * neither the name of the copyright holders nor the names of its 12 * contributors may be used to endorse or promote products derived from 13 * this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * Authors: Gabe Black 28 */ 29 30#ifndef __SYSTEMC_EXT_CHANNEL_SC_BUFFER_HH__ 31#define __SYSTEMC_EXT_CHANNEL_SC_BUFFER_HH__ 32 33#include "../core/sc_module.hh" // for sc_gen_unique_name 34#include "sc_signal.hh" 35 36namespace sc_core 37{ 38 39// Having a default value for the WRITER_POLICY parameter is non-standard, but 40// matches the Accellera implementation to enable the regression tests. 41template <class T, sc_writer_policy WRITER_POLICY=SC_ONE_WRITER> 42class sc_buffer : public sc_signal<T, WRITER_POLICY> 43{ 44 public: 45 sc_buffer() : sc_signal<T, WRITER_POLICY>(sc_gen_unique_name("buffer")) {} 46 explicit sc_buffer(const char *name) : 47 sc_signal<T, WRITER_POLICY>(sc_gen_unique_name(name)) 48 {} 49 50 virtual void 51 write(const T &t) 52 { 53 this->m_new_val = t; 54 this->request_update(); 55 } 56 57 sc_buffer<T, WRITER_POLICY> & 58 operator = (const T &arg) 59 { 60 write(arg); 61 return *this; 62 } 63 sc_buffer<T, WRITER_POLICY> & 64 operator = (const sc_signal<T, WRITER_POLICY> &arg) 65 { 66 write(arg.read()); 67 return *this; 68 } 69 sc_buffer<T, WRITER_POLICY> & 70 operator = (const sc_buffer<T, WRITER_POLICY> &arg) 71 { 72 write(arg.read()); 73 return *this; 74 } 75 76 virtual const char *kind() const { return "sc_buffer"; } 77 78 protected: 79 virtual void 80 update() 81 { 82 this->m_cur_val = this->m_new_val; 83 this->_signalChange(); 84 } 85 86 private: 87 // Disabled 88 sc_buffer(const sc_buffer<T, WRITER_POLICY> &) {} 89}; 90 91} // namespace sc_core 92 93#endif //__SYSTEMC_EXT_CHANNEL_SC_BUFFER_HH__ 94