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|
/*****************************************************************************
Copyright (c) 1996, 2010, Innobase Oy. All Rights Reserved.
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; version 2 of the License.
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.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/**************************************************//**
@file include/pars0pars.h
SQL parser
Created 11/19/1996 Heikki Tuuri
*******************************************************/
#ifndef pars0pars_h
#define pars0pars_h
#include "univ.i"
#include "que0types.h"
#include "usr0types.h"
#include "pars0types.h"
#include "row0types.h"
#include "trx0types.h"
#include "ut0vec.h"
/** Type of the user functions. The first argument is always InnoDB-supplied
and varies in type, while 'user_arg' is a user-supplied argument. The
meaning of the return type also varies. See the individual use cases, e.g.
the FETCH statement, for details on them. */
typedef void* (*pars_user_func_cb_t)(void* arg, void* user_arg);
/** If the following is set TRUE, the parser will emit debugging
information */
extern int yydebug;
#ifdef UNIV_SQL_DEBUG
/** If the following is set TRUE, the lexer will print the SQL string
as it tokenizes it */
extern ibool pars_print_lexed;
#endif /* UNIV_SQL_DEBUG */
/* Global variable used while parsing a single procedure or query : the code is
NOT re-entrant */
extern sym_tab_t* pars_sym_tab_global;
extern pars_res_word_t pars_to_char_token;
extern pars_res_word_t pars_to_number_token;
extern pars_res_word_t pars_to_binary_token;
extern pars_res_word_t pars_binary_to_number_token;
extern pars_res_word_t pars_substr_token;
extern pars_res_word_t pars_replstr_token;
extern pars_res_word_t pars_concat_token;
extern pars_res_word_t pars_length_token;
extern pars_res_word_t pars_instr_token;
extern pars_res_word_t pars_sysdate_token;
extern pars_res_word_t pars_printf_token;
extern pars_res_word_t pars_assert_token;
extern pars_res_word_t pars_rnd_token;
extern pars_res_word_t pars_rnd_str_token;
extern pars_res_word_t pars_count_token;
extern pars_res_word_t pars_sum_token;
extern pars_res_word_t pars_distinct_token;
extern pars_res_word_t pars_binary_token;
extern pars_res_word_t pars_blob_token;
extern pars_res_word_t pars_int_token;
extern pars_res_word_t pars_char_token;
extern pars_res_word_t pars_float_token;
extern pars_res_word_t pars_update_token;
extern pars_res_word_t pars_asc_token;
extern pars_res_word_t pars_desc_token;
extern pars_res_word_t pars_open_token;
extern pars_res_word_t pars_close_token;
extern pars_res_word_t pars_share_token;
extern pars_res_word_t pars_unique_token;
extern pars_res_word_t pars_clustered_token;
extern ulint pars_star_denoter;
/* Procedure parameter types */
#define PARS_INPUT 0
#define PARS_OUTPUT 1
#define PARS_NOT_PARAM 2
int
yyparse(void);
/*************************************************************//**
Parses an SQL string returning the query graph.
@return own: the query graph */
UNIV_INTERN
que_t*
pars_sql(
/*=====*/
pars_info_t* info, /*!< in: extra information, or NULL */
const char* str); /*!< in: SQL string */
/*************************************************************//**
Retrieves characters to the lexical analyzer. */
UNIV_INTERN
void
pars_get_lex_chars(
/*===============*/
char* buf, /*!< in/out: buffer where to copy */
int* result, /*!< out: number of characters copied or EOF */
int max_size); /*!< in: maximum number of characters which fit
in the buffer */
/*************************************************************//**
Called by yyparse on error. */
UNIV_INTERN
void
yyerror(
/*====*/
const char* s); /*!< in: error message string */
/*********************************************************************//**
Parses a variable declaration.
@return own: symbol table node of type SYM_VAR */
UNIV_INTERN
sym_node_t*
pars_variable_declaration(
/*======================*/
sym_node_t* node, /*!< in: symbol table node allocated for the
id of the variable */
pars_res_word_t* type); /*!< in: pointer to a type token */
/*********************************************************************//**
Parses a function expression.
@return own: function node in a query tree */
UNIV_INTERN
func_node_t*
pars_func(
/*======*/
que_node_t* res_word,/*!< in: function name reserved word */
que_node_t* arg); /*!< in: first argument in the argument list */
/*********************************************************************//**
Parses an operator expression.
@return own: function node in a query tree */
UNIV_INTERN
func_node_t*
pars_op(
/*====*/
int func, /*!< in: operator token code */
que_node_t* arg1, /*!< in: first argument */
que_node_t* arg2); /*!< in: second argument or NULL for an unary
operator */
/*********************************************************************//**
Parses an ORDER BY clause. Order by a single column only is supported.
@return own: order-by node in a query tree */
UNIV_INTERN
order_node_t*
pars_order_by(
/*==========*/
sym_node_t* column, /*!< in: column name */
pars_res_word_t* asc); /*!< in: &pars_asc_token or pars_desc_token */
/*********************************************************************//**
Parses a select list; creates a query graph node for the whole SELECT
statement.
@return own: select node in a query tree */
UNIV_INTERN
sel_node_t*
pars_select_list(
/*=============*/
que_node_t* select_list, /*!< in: select list */
sym_node_t* into_list); /*!< in: variables list or NULL */
/*********************************************************************//**
Parses a cursor declaration.
@return sym_node */
UNIV_INTERN
que_node_t*
pars_cursor_declaration(
/*====================*/
sym_node_t* sym_node, /*!< in: cursor id node in the symbol
table */
sel_node_t* select_node); /*!< in: select node */
/*********************************************************************//**
Parses a function declaration.
@return sym_node */
UNIV_INTERN
que_node_t*
pars_function_declaration(
/*======================*/
sym_node_t* sym_node); /*!< in: function id node in the symbol
table */
/*********************************************************************//**
Parses a select statement.
@return own: select node in a query tree */
UNIV_INTERN
sel_node_t*
pars_select_statement(
/*==================*/
sel_node_t* select_node, /*!< in: select node already containing
the select list */
sym_node_t* table_list, /*!< in: table list */
que_node_t* search_cond, /*!< in: search condition or NULL */
pars_res_word_t* for_update, /*!< in: NULL or &pars_update_token */
pars_res_word_t* consistent_read,/*!< in: NULL or
&pars_consistent_token */
order_node_t* order_by); /*!< in: NULL or an order-by node */
/*********************************************************************//**
Parses a column assignment in an update.
@return column assignment node */
UNIV_INTERN
col_assign_node_t*
pars_column_assignment(
/*===================*/
sym_node_t* column, /*!< in: column to assign */
que_node_t* exp); /*!< in: value to assign */
/*********************************************************************//**
Parses a delete or update statement start.
@return own: update node in a query tree */
UNIV_INTERN
upd_node_t*
pars_update_statement_start(
/*========================*/
ibool is_delete, /*!< in: TRUE if delete */
sym_node_t* table_sym, /*!< in: table name node */
col_assign_node_t* col_assign_list);/*!< in: column assignment list, NULL
if delete */
/*********************************************************************//**
Parses an update or delete statement.
@return own: update node in a query tree */
UNIV_INTERN
upd_node_t*
pars_update_statement(
/*==================*/
upd_node_t* node, /*!< in: update node */
sym_node_t* cursor_sym, /*!< in: pointer to a cursor entry in
the symbol table or NULL */
que_node_t* search_cond); /*!< in: search condition or NULL */
/*********************************************************************//**
Parses an insert statement.
@return own: update node in a query tree */
UNIV_INTERN
ins_node_t*
pars_insert_statement(
/*==================*/
sym_node_t* table_sym, /*!< in: table name node */
que_node_t* values_list, /*!< in: value expression list or NULL */
sel_node_t* select); /*!< in: select condition or NULL */
/*********************************************************************//**
Parses a procedure parameter declaration.
@return own: symbol table node of type SYM_VAR */
UNIV_INTERN
sym_node_t*
pars_parameter_declaration(
/*=======================*/
sym_node_t* node, /*!< in: symbol table node allocated for the
id of the parameter */
ulint param_type,
/*!< in: PARS_INPUT or PARS_OUTPUT */
pars_res_word_t* type); /*!< in: pointer to a type token */
/*********************************************************************//**
Parses an elsif element.
@return elsif node */
UNIV_INTERN
elsif_node_t*
pars_elsif_element(
/*===============*/
que_node_t* cond, /*!< in: if-condition */
que_node_t* stat_list); /*!< in: statement list */
/*********************************************************************//**
Parses an if-statement.
@return if-statement node */
UNIV_INTERN
if_node_t*
pars_if_statement(
/*==============*/
que_node_t* cond, /*!< in: if-condition */
que_node_t* stat_list, /*!< in: statement list */
que_node_t* else_part); /*!< in: else-part statement list */
/*********************************************************************//**
Parses a for-loop-statement.
@return for-statement node */
UNIV_INTERN
for_node_t*
pars_for_statement(
/*===============*/
sym_node_t* loop_var, /*!< in: loop variable */
que_node_t* loop_start_limit,/*!< in: loop start expression */
que_node_t* loop_end_limit, /*!< in: loop end expression */
que_node_t* stat_list); /*!< in: statement list */
/*********************************************************************//**
Parses a while-statement.
@return while-statement node */
UNIV_INTERN
while_node_t*
pars_while_statement(
/*=================*/
que_node_t* cond, /*!< in: while-condition */
que_node_t* stat_list); /*!< in: statement list */
/*********************************************************************//**
Parses an exit statement.
@return exit statement node */
UNIV_INTERN
exit_node_t*
pars_exit_statement(void);
/*=====================*/
/*********************************************************************//**
Parses a return-statement.
@return return-statement node */
UNIV_INTERN
return_node_t*
pars_return_statement(void);
/*=======================*/
/*********************************************************************//**
Parses a procedure call.
@return function node */
UNIV_INTERN
func_node_t*
pars_procedure_call(
/*================*/
que_node_t* res_word,/*!< in: procedure name reserved word */
que_node_t* args); /*!< in: argument list */
/*********************************************************************//**
Parses an assignment statement.
@return assignment statement node */
UNIV_INTERN
assign_node_t*
pars_assignment_statement(
/*======================*/
sym_node_t* var, /*!< in: variable to assign */
que_node_t* val); /*!< in: value to assign */
/*********************************************************************//**
Parses a fetch statement. into_list or user_func (but not both) must be
non-NULL.
@return fetch statement node */
UNIV_INTERN
fetch_node_t*
pars_fetch_statement(
/*=================*/
sym_node_t* cursor, /*!< in: cursor node */
sym_node_t* into_list, /*!< in: variables to set, or NULL */
sym_node_t* user_func); /*!< in: user function name, or NULL */
/*********************************************************************//**
Parses an open or close cursor statement.
@return fetch statement node */
UNIV_INTERN
open_node_t*
pars_open_statement(
/*================*/
ulint type, /*!< in: ROW_SEL_OPEN_CURSOR
or ROW_SEL_CLOSE_CURSOR */
sym_node_t* cursor); /*!< in: cursor node */
/*********************************************************************//**
Parses a row_printf-statement.
@return row_printf-statement node */
UNIV_INTERN
row_printf_node_t*
pars_row_printf_statement(
/*======================*/
sel_node_t* sel_node); /*!< in: select node */
/*********************************************************************//**
Parses a commit statement.
@return own: commit node struct */
UNIV_INTERN
commit_node_t*
pars_commit_statement(void);
/*=======================*/
/*********************************************************************//**
Parses a rollback statement.
@return own: rollback node struct */
UNIV_INTERN
roll_node_t*
pars_rollback_statement(void);
/*=========================*/
/*********************************************************************//**
Parses a column definition at a table creation.
@return column sym table node */
UNIV_INTERN
sym_node_t*
pars_column_def(
/*============*/
sym_node_t* sym_node, /*!< in: column node in the
symbol table */
pars_res_word_t* type, /*!< in: data type */
sym_node_t* len, /*!< in: length of column, or
NULL */
void* is_unsigned, /*!< in: if not NULL, column
is of type UNSIGNED. */
void* is_not_null); /*!< in: if not NULL, column
is of type NOT NULL. */
/*********************************************************************//**
Parses a table creation operation.
@return table create subgraph */
UNIV_INTERN
tab_node_t*
pars_create_table(
/*==============*/
sym_node_t* table_sym, /*!< in: table name node in the symbol
table */
sym_node_t* column_defs, /*!< in: list of column names */
void* not_fit_in_memory);/*!< in: a non-NULL pointer means that
this is a table which in simulations
should be simulated as not fitting
in memory; thread is put to sleep
to simulate disk accesses; NOTE that
this flag is not stored to the data
dictionary on disk, and the database
will forget about non-NULL value if
it has to reload the table definition
from disk */
/*********************************************************************//**
Parses an index creation operation.
@return index create subgraph */
UNIV_INTERN
ind_node_t*
pars_create_index(
/*==============*/
pars_res_word_t* unique_def, /*!< in: not NULL if a unique index */
pars_res_word_t* clustered_def, /*!< in: not NULL if a clustered index */
sym_node_t* index_sym, /*!< in: index name node in the symbol
table */
sym_node_t* table_sym, /*!< in: table name node in the symbol
table */
sym_node_t* column_list); /*!< in: list of column names */
/*********************************************************************//**
Parses a procedure definition.
@return query fork node */
UNIV_INTERN
que_fork_t*
pars_procedure_definition(
/*======================*/
sym_node_t* sym_node, /*!< in: procedure id node in the symbol
table */
sym_node_t* param_list, /*!< in: parameter declaration list */
que_node_t* stat_list); /*!< in: statement list */
/*************************************************************//**
Parses a stored procedure call, when this is not within another stored
procedure, that is, the client issues a procedure call directly.
In MySQL/InnoDB, stored InnoDB procedures are invoked via the
parsed procedure tree, not via InnoDB SQL, so this function is not used.
@return query graph */
UNIV_INTERN
que_fork_t*
pars_stored_procedure_call(
/*=======================*/
sym_node_t* sym_node); /*!< in: stored procedure name */
/******************************************************************//**
Completes a query graph by adding query thread and fork nodes
above it and prepares the graph for running. The fork created is of
type QUE_FORK_MYSQL_INTERFACE.
@return query thread node to run */
UNIV_INTERN
que_thr_t*
pars_complete_graph_for_exec(
/*=========================*/
que_node_t* node, /*!< in: root node for an incomplete
query graph */
trx_t* trx, /*!< in: transaction handle */
mem_heap_t* heap); /*!< in: memory heap from which allocated */
/****************************************************************//**
Create parser info struct.
@return own: info struct */
UNIV_INTERN
pars_info_t*
pars_info_create(void);
/*==================*/
/****************************************************************//**
Free info struct and everything it contains. */
UNIV_INTERN
void
pars_info_free(
/*===========*/
pars_info_t* info); /*!< in, own: info struct */
/****************************************************************//**
Add bound literal. */
UNIV_INTERN
void
pars_info_add_literal(
/*==================*/
pars_info_t* info, /*!< in: info struct */
const char* name, /*!< in: name */
const void* address, /*!< in: address */
ulint length, /*!< in: length of data */
ulint type, /*!< in: type, e.g. DATA_FIXBINARY */
ulint prtype); /*!< in: precise type, e.g.
DATA_UNSIGNED */
/****************************************************************//**
Equivalent to pars_info_add_literal(info, name, str, strlen(str),
DATA_VARCHAR, DATA_ENGLISH). */
UNIV_INTERN
void
pars_info_add_str_literal(
/*======================*/
pars_info_t* info, /*!< in: info struct */
const char* name, /*!< in: name */
const char* str); /*!< in: string */
/****************************************************************//**
Equivalent to:
char buf[4];
mach_write_to_4(buf, val);
pars_info_add_literal(info, name, buf, 4, DATA_INT, 0);
except that the buffer is dynamically allocated from the info struct's
heap. */
UNIV_INTERN
void
pars_info_add_int4_literal(
/*=======================*/
pars_info_t* info, /*!< in: info struct */
const char* name, /*!< in: name */
lint val); /*!< in: value */
/****************************************************************//**
Equivalent to:
char buf[8];
mach_write_to_8(buf, val);
pars_info_add_literal(info, name, buf, 8, DATA_FIXBINARY, 0);
except that the buffer is dynamically allocated from the info struct's
heap. */
UNIV_INTERN
void
pars_info_add_ull_literal(
/*======================*/
pars_info_t* info, /*!< in: info struct */
const char* name, /*!< in: name */
ib_uint64_t val); /*!< in: value */
/****************************************************************//**
Add user function. */
UNIV_INTERN
void
pars_info_add_function(
/*===================*/
pars_info_t* info, /*!< in: info struct */
const char* name, /*!< in: function name */
pars_user_func_cb_t func, /*!< in: function address */
void* arg); /*!< in: user-supplied argument */
/****************************************************************//**
Add bound id. */
UNIV_INTERN
void
pars_info_add_id(
/*=============*/
pars_info_t* info, /*!< in: info struct */
const char* name, /*!< in: name */
const char* id); /*!< in: id */
/****************************************************************//**
Get user function with the given name.
@return user func, or NULL if not found */
UNIV_INTERN
pars_user_func_t*
pars_info_get_user_func(
/*====================*/
pars_info_t* info, /*!< in: info struct */
const char* name); /*!< in: function name to find*/
/****************************************************************//**
Get bound literal with the given name.
@return bound literal, or NULL if not found */
UNIV_INTERN
pars_bound_lit_t*
pars_info_get_bound_lit(
/*====================*/
pars_info_t* info, /*!< in: info struct */
const char* name); /*!< in: bound literal name to find */
/****************************************************************//**
Get bound id with the given name.
@return bound id, or NULL if not found */
UNIV_INTERN
pars_bound_id_t*
pars_info_get_bound_id(
/*===================*/
pars_info_t* info, /*!< in: info struct */
const char* name); /*!< in: bound id name to find */
/******************************************************************//**
Release any resources used by the lexer. */
UNIV_INTERN
void
pars_lexer_close(void);
/*==================*/
/** Extra information supplied for pars_sql(). */
struct pars_info_struct {
mem_heap_t* heap; /*!< our own memory heap */
ib_vector_t* funcs; /*!< user functions, or NUll
(pars_user_func_t*) */
ib_vector_t* bound_lits; /*!< bound literals, or NULL
(pars_bound_lit_t*) */
ib_vector_t* bound_ids; /*!< bound ids, or NULL
(pars_bound_id_t*) */
ibool graph_owns_us; /*!< if TRUE (which is the default),
que_graph_free() will free us */
};
/** User-supplied function and argument. */
struct pars_user_func_struct {
const char* name; /*!< function name */
pars_user_func_cb_t func; /*!< function address */
void* arg; /*!< user-supplied argument */
};
/** Bound literal. */
struct pars_bound_lit_struct {
const char* name; /*!< name */
const void* address; /*!< address */
ulint length; /*!< length of data */
ulint type; /*!< type, e.g. DATA_FIXBINARY */
ulint prtype; /*!< precise type, e.g. DATA_UNSIGNED */
};
/** Bound identifier. */
struct pars_bound_id_struct {
const char* name; /*!< name */
const char* id; /*!< identifier */
};
/** Struct used to denote a reserved word in a parsing tree */
struct pars_res_word_struct{
int code; /*!< the token code for the reserved word from
pars0grm.h */
};
/** A predefined function or operator node in a parsing tree; this construct
is also used for some non-functions like the assignment ':=' */
struct func_node_struct{
que_common_t common; /*!< type: QUE_NODE_FUNC */
int func; /*!< token code of the function name */
ulint class; /*!< class of the function */
que_node_t* args; /*!< argument(s) of the function */
UT_LIST_NODE_T(func_node_t) cond_list;
/*!< list of comparison conditions; defined
only for comparison operator nodes except,
presently, for OPT_SCROLL_TYPE ones */
UT_LIST_NODE_T(func_node_t) func_node_list;
/*!< list of function nodes in a parsed
query graph */
};
/** An order-by node in a select */
struct order_node_struct{
que_common_t common; /*!< type: QUE_NODE_ORDER */
sym_node_t* column; /*!< order-by column */
ibool asc; /*!< TRUE if ascending, FALSE if descending */
};
/** Procedure definition node */
struct proc_node_struct{
que_common_t common; /*!< type: QUE_NODE_PROC */
sym_node_t* proc_id; /*!< procedure name symbol in the symbol
table of this same procedure */
sym_node_t* param_list; /*!< input and output parameters */
que_node_t* stat_list; /*!< statement list */
sym_tab_t* sym_tab; /*!< symbol table of this procedure */
};
/** elsif-element node */
struct elsif_node_struct{
que_common_t common; /*!< type: QUE_NODE_ELSIF */
que_node_t* cond; /*!< if condition */
que_node_t* stat_list; /*!< statement list */
};
/** if-statement node */
struct if_node_struct{
que_common_t common; /*!< type: QUE_NODE_IF */
que_node_t* cond; /*!< if condition */
que_node_t* stat_list; /*!< statement list */
que_node_t* else_part; /*!< else-part statement list */
elsif_node_t* elsif_list; /*!< elsif element list */
};
/** while-statement node */
struct while_node_struct{
que_common_t common; /*!< type: QUE_NODE_WHILE */
que_node_t* cond; /*!< while condition */
que_node_t* stat_list; /*!< statement list */
};
/** for-loop-statement node */
struct for_node_struct{
que_common_t common; /*!< type: QUE_NODE_FOR */
sym_node_t* loop_var; /*!< loop variable: this is the
dereferenced symbol from the
variable declarations, not the
symbol occurrence in the for loop
definition */
que_node_t* loop_start_limit;/*!< initial value of loop variable */
que_node_t* loop_end_limit; /*!< end value of loop variable */
lint loop_end_value; /*!< evaluated value for the end value:
it is calculated only when the loop
is entered, and will not change within
the loop */
que_node_t* stat_list; /*!< statement list */
};
/** exit statement node */
struct exit_node_struct{
que_common_t common; /*!< type: QUE_NODE_EXIT */
};
/** return-statement node */
struct return_node_struct{
que_common_t common; /*!< type: QUE_NODE_RETURN */
};
/** Assignment statement node */
struct assign_node_struct{
que_common_t common; /*!< type: QUE_NODE_ASSIGNMENT */
sym_node_t* var; /*!< variable to set */
que_node_t* val; /*!< value to assign */
};
/** Column assignment node */
struct col_assign_node_struct{
que_common_t common; /*!< type: QUE_NODE_COL_ASSIGN */
sym_node_t* col; /*!< column to set */
que_node_t* val; /*!< value to assign */
};
/** Classes of functions */
/* @{ */
#define PARS_FUNC_ARITH 1 /*!< +, -, *, / */
#define PARS_FUNC_LOGICAL 2 /*!< AND, OR, NOT */
#define PARS_FUNC_CMP 3 /*!< comparison operators */
#define PARS_FUNC_PREDEFINED 4 /*!< TO_NUMBER, SUBSTR, ... */
#define PARS_FUNC_AGGREGATE 5 /*!< COUNT, DISTINCT, SUM */
#define PARS_FUNC_OTHER 6 /*!< these are not real functions,
e.g., := */
/* @} */
#ifndef UNIV_NONINL
#include "pars0pars.ic"
#endif
#endif
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