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/* -*- C++ -*- */
/* Copyright (C) 2002 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef _SP_RCONTEXT_H_
#define _SP_RCONTEXT_H_
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
struct sp_cond_type;
#define SP_HANDLER_NONE 0
#define SP_HANDLER_EXIT 1
#define SP_HANDLER_CONTINUE 2
#define SP_HANDLER_UNDO 3
typedef struct
{
struct sp_cond_type *cond;
uint handler; // Location of handler
int type;
uint foffset; // Frame offset for the handlers declare level
} sp_handler_t;
class sp_rcontext : public Sql_alloc
{
sp_rcontext(const sp_rcontext &); /* Prevent use of these */
void operator=(sp_rcontext &);
public:
sp_rcontext(uint fsize, uint hmax);
~sp_rcontext()
{
// Not needed?
//sql_element_free(m_frame);
//m_saved.empty();
}
inline void
push_item(Item *i)
{
if (m_count < m_fsize)
m_frame[m_count++] = i;
}
inline void
set_item(uint idx, Item *i)
{
if (idx < m_count)
m_frame[idx] = i;
}
inline Item *
get_item(uint idx)
{
return m_frame[idx];
}
inline void
set_oindex(uint idx, int oidx)
{
m_outs[idx] = oidx;
}
inline int
get_oindex(uint idx)
{
return m_outs[idx];
}
inline void
set_result(Item *it)
{
m_result= it;
}
inline Item *
get_result()
{
return m_result;
}
inline void
push_handler(struct sp_cond_type *cond, uint h, int type, uint f)
{
m_handler[m_hcount].cond= cond;
m_handler[m_hcount].handler= h;
m_handler[m_hcount].type= type;
m_handler[m_hcount].foffset= f;
m_hcount+= 1;
}
inline void
pop_handlers(uint count)
{
m_hcount-= count;
}
// Returns 1 if a handler was found, 0 otherwise.
int
find_handler(uint sql_errno);
// Returns handler type and sets *ip to location if one was found
inline int
found_handler(uint *ip, uint *fp)
{
if (m_hfound < 0)
return SP_HANDLER_NONE;
*ip= m_handler[m_hfound].handler;
*fp= m_handler[m_hfound].foffset;
return m_handler[m_hfound].type;
}
// Clears the handler find state
inline void
clear_handler()
{
m_hfound= -1;
}
inline void
push_hstack(uint h)
{
m_hstack[m_hsp++]= h;
}
inline uint
pop_hstack()
{
return m_hstack[--m_hsp];
}
// Save variables starting at fp and up
void
save_variables(uint fp);
// Restore variables down to fp
void
restore_variables(uint fp);
private:
uint m_count;
uint m_fsize;
Item **m_frame;
int *m_outs;
Item *m_result; // For FUNCTIONs
sp_handler_t *m_handler;
uint m_hcount;
uint *m_hstack;
uint m_hsp;
int m_hfound; // Set by find_handler; -1 if not found
List<Item> m_saved; // Saved variables
}; // class sp_rcontext : public Sql_alloc
#endif /* _SP_RCONTEXT_H_ */
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