/*************************************************************************** drccache.h Universal dynamic recompiler cache management. **************************************************************************** Copyright Aaron Giles All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name 'MAME' nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ***************************************************************************/ #pragma once #ifndef __DRCCACHE_H__ #define __DRCCACHE_H__ //************************************************************************** // MACROS //************************************************************************** // ensure that a given pointer is within the cache boundaries #define assert_in_cache(c,p) assert((c).contains_pointer(p)) #define assert_in_near_cache(c,p) assert((c).contains_near_pointer(p)) //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // generic code pointer typedef UINT8 *drccodeptr; // helper template for oob codegen typedef delegate drc_oob_delegate; // drc_cache class drc_cache { public: // construction/destruction drc_cache(size_t bytes); ~drc_cache(); // getters drccodeptr near() const { return m_near; } drccodeptr base() const { return m_base; } drccodeptr top() const { return m_top; } // pointer checking bool contains_pointer(const void *ptr) const { return ((const drccodeptr)ptr >= m_near && (const drccodeptr)ptr < m_near + m_size); } bool contains_near_pointer(const void *ptr) const { return ((const drccodeptr)ptr >= m_near && (const drccodeptr)ptr < m_neartop); } bool generating_code() const { return (m_codegen != NULL); } // memory management void flush(); void *alloc(size_t bytes); void *alloc_near(size_t bytes); void *alloc_temporary(size_t bytes); void dealloc(void *memory, size_t bytes); // codegen helpers drccodeptr *begin_codegen(UINT32 reserve_bytes); drccodeptr end_codegen(); void request_oob_codegen(drc_oob_delegate callback, void *param1 = NULL, void *param2 = NULL); private: // largest block of code that can be generated at once static const size_t CODEGEN_MAX_BYTES = 65536; // minimum alignment, in bytes (must be power of 2) static const size_t CACHE_ALIGNMENT = 8; // largest permanent allocation we allow static const size_t MAX_PERMANENT_ALLOC = 1024; // size of "near" area at the base of the cache static const size_t NEAR_CACHE_SIZE = 65536; // core parameters drccodeptr m_near; // pointer to the near part of the cache drccodeptr m_neartop; // top of the near part of the cache drccodeptr m_base; // base pointer to the compiler cache drccodeptr m_top; // current top of cache drccodeptr m_end; // end of cache memory drccodeptr m_codegen; // start of generated code size_t m_size; // size of the cache in bytes // oob management struct oob_handler { oob_handler *next() const { return m_next; } oob_handler * m_next; // next handler drc_oob_delegate m_callback; // callback function void * m_param1; // 1st pointer parameter void * m_param2; // 2nd pointer parameter }; simple_list m_ooblist; // list of oob handlers // free lists struct free_link { free_link * m_next; // pointer to the next guy }; free_link * m_free[MAX_PERMANENT_ALLOC / CACHE_ALIGNMENT]; free_link * m_nearfree[MAX_PERMANENT_ALLOC / CACHE_ALIGNMENT]; }; #endif /* __DRCCACHE_H__ */