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/***************************************************************************
drcbeut.h
Utility functions for dynamic recompiling backends.
****************************************************************************
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 __DRCBEUT_H__
#define __DRCBEUT_H__
#include "drcuml.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> drc_hash_table
// common hash table management
class drc_hash_table
{
public:
// construction/destruction
drc_hash_table(drc_cache &cache, UINT32 modes, UINT8 addrbits, UINT8 ignorebits);
// getters
drccodeptr ***base() const { return m_base; }
UINT8 l1bits() const { return m_l1bits; }
UINT8 l2bits() const { return m_l2bits; }
UINT8 l1shift() const { return m_l1shift; }
UINT8 l2shift() const { return m_l2shift; }
offs_t l1mask() const { return m_l1mask; }
offs_t l2mask() const { return m_l2mask; }
bool is_mode_populated(UINT32 mode) const { return m_base[mode] != m_emptyl1; }
// set up and configuration
bool reset();
void set_default_codeptr(drccodeptr code);
// block begin/end
void block_begin(drcuml_block &block, const uml::instruction *instlist, UINT32 numinst);
void block_end(drcuml_block &block);
// code pointer access
bool set_codeptr(UINT32 mode, UINT32 pc, drccodeptr code);
drccodeptr get_codeptr(UINT32 mode, UINT32 pc) { assert(mode < m_modes); return m_base[mode][(pc >> m_l1shift) & m_l1mask][(pc >> m_l2shift) & m_l2mask]; }
bool code_exists(UINT32 mode, UINT32 pc) { return get_codeptr(mode, pc) != m_nocodeptr; }
private:
// internal state
drc_cache & m_cache; // cache where allocations come from
UINT32 m_modes; // number of modes supported
drccodeptr m_nocodeptr; // pointer to code which will handle missing entries
UINT8 m_l1bits; // bits worth of entries in l1 hash tables
UINT8 m_l2bits; // bits worth of entries in l2 hash tables
UINT8 m_l1shift; // shift to apply to the PC to get the l1 hash entry
UINT8 m_l2shift; // shift to apply to the PC to get the l2 hash entry
offs_t m_l1mask; // mask to apply after shifting
offs_t m_l2mask; // mask to apply after shifting
drccodeptr *** m_base; // pointer to the l1 table for each mode
drccodeptr ** m_emptyl1; // pointer to empty l1 hash table
drccodeptr * m_emptyl2; // pointer to empty l2 hash table
};
// ======================> drc_map_variables
// common map variable management
class drc_map_variables
{
public:
// construction/destruction
drc_map_variables(drc_cache &cache, UINT64 uniquevalue);
~drc_map_variables();
// block begin/end
void block_begin(drcuml_block &block);
void block_end(drcuml_block &block);
// get/set values
void set_value(drccodeptr codebase, UINT32 mapvar, UINT32 newvalue);
UINT32 get_value(drccodeptr codebase, UINT32 mapvar) const;
UINT32 get_last_value(UINT32 mapvar);
// static accessors to be called directly by generated code
static UINT32 static_get_value(drc_map_variables &map, drccodeptr codebase, UINT32 mapvar);
private:
// internal state
drc_cache & m_cache; // pointer to the cache
UINT64 m_uniquevalue; // unique value used to find the table
UINT32 m_mapvalue[uml::MAPVAR_END - uml::MAPVAR_M0]; // array of current values
// list of entries
struct map_entry
{
map_entry *next() const { return m_next; }
map_entry * m_next; // pointer to next map entry
drccodeptr m_codeptr; // pointer to the relevant code
UINT32 m_mapvar; // map variable id
UINT32 m_newval; // value of the variable starting at codeptr
};
simple_list<map_entry> m_entry_list; // list of entries
};
// ======================> drc_label_list
typedef delegate<void (void *, drccodeptr)> drc_label_fixup_delegate;
// structure holding a live list of labels
class drc_label_list
{
public:
// construction/destruction
drc_label_list(drc_cache &cache);
~drc_label_list();
// block begin/end
void block_begin(drcuml_block &block);
void block_end(drcuml_block &block);
// get/set values
drccodeptr get_codeptr(uml::code_label label, drc_label_fixup_delegate fixup, void *param);
void set_codeptr(uml::code_label label, drccodeptr codeptr);
private:
struct label_entry
{
label_entry *next() const { return m_next; }
label_entry * m_next; // pointer to next label
uml::code_label m_label; // the label specified
drccodeptr m_codeptr; // pointer to the relevant code
};
struct label_fixup
{
label_fixup *next() const { return m_next; }
label_fixup * m_next; // pointer to the next oob
label_entry * m_label; // the label in question
drc_label_fixup_delegate m_callback; // callback
};
// internal helpers
void reset(bool fatal_on_leftovers);
label_entry *find_or_allocate(uml::code_label label);
void oob_callback(drccodeptr *codeptr, void *param1, void *param2);
// internal state
drc_cache & m_cache; // pointer to the cache
simple_list<label_entry> m_list; // head of the live list
simple_list<label_fixup> m_fixup_list; // list of pending oob fixups
drc_oob_delegate m_oob_callback_delegate; // pre-computed delegate
};
#endif /* __DRCBEUT_H__ */
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