mirror of
https://github.com/MariaDB/server.git
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f6611aa0ab
Implemented IF-THEN-ELSE. sql/sp_head.cc: Reimplemented the broken backpatching, so it works for nested constructions and IF-THEN-ELSE too. sql/sp_head.h: Reimplemented the broken backpatching, so it works for nested constructions and IF-THEN-ELSE too. sql/sp_pcontext.cc: Return the value from push-methods, for convenience. sql/sp_pcontext.h: Return the value from push-methods, for convenience. sql/sql_yacc.yy: Implemented IF-THEN-ELSE. Corrected for the new backpatch method.
158 lines
2.9 KiB
C++
158 lines
2.9 KiB
C++
/* -*- C++ -*- */
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/* Copyright (C) 2002 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef _SP_PCONTEXT_H_
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#define _SP_PCONTEXT_H_
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#ifdef __GNUC__
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#pragma interface /* gcc class implementation */
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#endif
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typedef enum
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{
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sp_param_in,
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sp_param_out,
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sp_param_inout
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} sp_param_mode_t;
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typedef struct
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{
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Item_string *name;
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enum enum_field_types type;
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sp_param_mode_t mode;
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uint offset; // Offset in current frame
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my_bool isset;
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} sp_pvar_t;
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typedef struct sp_label
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{
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char *name;
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uint ip; // Instruction index
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} sp_label_t;
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class sp_pcontext : public Sql_alloc
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{
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sp_pcontext(const sp_pcontext &); /* Prevent use of these */
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void operator=(sp_pcontext &);
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public:
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sp_pcontext();
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inline uint
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max_framesize()
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{
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return m_framesize;
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}
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inline uint
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current_framesize()
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{
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return m_i;
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}
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inline uint
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params()
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{
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return m_params;
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}
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// Set the number of parameters to the current esize
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inline void
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set_params()
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{
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m_params= m_i;
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}
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inline void
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set_type(uint i, enum enum_field_types type)
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{
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if (i < m_i)
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m_pvar[i].type= type;
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}
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inline void
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set_isset(uint i, my_bool val)
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{
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if (i < m_i)
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m_pvar[i].isset= val;
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}
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void
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push(LEX_STRING *name, enum enum_field_types type, sp_param_mode_t mode);
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// Pop the last 'num' slots of the frame
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inline void
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pop(uint num = 1)
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{
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if (num >= m_i)
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m_i -= num;
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}
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// Find by name
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sp_pvar_t *
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find_pvar(LEX_STRING *name);
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// Find by index
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sp_pvar_t *
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find_pvar(uint i)
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{
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if (i >= m_i)
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return NULL;
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return m_pvar+i;
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}
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sp_label_t *
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push_label(char *name, uint ip);
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sp_label_t *
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push_gen_label(uint ip);
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sp_label_t *
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find_label(char *name);
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inline sp_label_t *
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last_label()
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{
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return m_label.head();
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}
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inline sp_label_t *
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pop_label()
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{
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return m_label.pop();
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}
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private:
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uint m_params; // The number of parameters
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uint m_framesize; // The maximum framesize
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uint m_i; // The current index (during parsing)
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sp_pvar_t *m_pvar;
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uint m_pvar_size; // Current size of m_pvar.
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void
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grow();
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List<sp_label_t> m_label; // The label list
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uint m_genlab; // Gen. label counter
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}; // class sp_pcontext : public Sql_alloc
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#endif /* _SP_PCONTEXT_H_ */
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