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/***************************************************************************
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<void (drccodeptr *, void *, void *)> 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<oob_handler> 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__ */
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