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245 lines
8.1 KiB
C
245 lines
8.1 KiB
C
/*****************************************************************************
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Copyright (c) 1997, 2009, Innobase Oy. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/pars0sym.h
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SQL parser symbol table
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Created 12/15/1997 Heikki Tuuri
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*******************************************************/
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#ifndef pars0sym_h
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#define pars0sym_h
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#include "univ.i"
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#include "que0types.h"
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#include "usr0types.h"
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#include "dict0types.h"
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#include "pars0types.h"
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#include "row0types.h"
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/******************************************************************//**
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Creates a symbol table for a single stored procedure or query.
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@return own: symbol table */
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UNIV_INTERN
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sym_tab_t*
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sym_tab_create(
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/*===========*/
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mem_heap_t* heap); /*!< in: memory heap where to create */
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/******************************************************************//**
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Frees the memory allocated dynamically AFTER parsing phase for variables
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etc. in the symbol table. Does not free the mem heap where the table was
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originally created. Frees also SQL explicit cursor definitions. */
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UNIV_INTERN
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void
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sym_tab_free_private(
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/*=================*/
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sym_tab_t* sym_tab); /*!< in, own: symbol table */
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/******************************************************************//**
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Adds an integer literal to a symbol table.
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@return symbol table node */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_int_lit(
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/*================*/
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sym_tab_t* sym_tab, /*!< in: symbol table */
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ulint val); /*!< in: integer value */
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/******************************************************************//**
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Adds an string literal to a symbol table.
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@return symbol table node */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_str_lit(
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/*================*/
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sym_tab_t* sym_tab, /*!< in: symbol table */
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byte* str, /*!< in: string with no quotes around
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it */
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ulint len); /*!< in: string length */
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/******************************************************************//**
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Add a bound literal to a symbol table.
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@return symbol table node */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_bound_lit(
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/*==================*/
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sym_tab_t* sym_tab, /*!< in: symbol table */
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const char* name, /*!< in: name of bound literal */
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ulint* lit_type); /*!< out: type of literal (PARS_*_LIT) */
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/******************************************************************//**
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Adds an SQL null literal to a symbol table.
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@return symbol table node */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_null_lit(
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/*=================*/
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sym_tab_t* sym_tab); /*!< in: symbol table */
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/******************************************************************//**
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Adds an identifier to a symbol table.
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@return symbol table node */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_id(
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/*===========*/
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sym_tab_t* sym_tab, /*!< in: symbol table */
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byte* name, /*!< in: identifier name */
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ulint len); /*!< in: identifier length */
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/******************************************************************//**
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Add a bound identifier to a symbol table.
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@return symbol table node */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_bound_id(
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/*===========*/
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sym_tab_t* sym_tab, /*!< in: symbol table */
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const char* name); /*!< in: name of bound id */
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/** Index of sym_node_struct::field_nos corresponding to the clustered index */
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#define SYM_CLUST_FIELD_NO 0
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/** Index of sym_node_struct::field_nos corresponding to a secondary index */
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#define SYM_SEC_FIELD_NO 1
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/** Types of a symbol table node */
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enum sym_tab_entry {
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SYM_VAR = 91, /*!< declared parameter or local
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variable of a procedure */
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SYM_IMPLICIT_VAR, /*!< storage for a intermediate result
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of a calculation */
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SYM_LIT, /*!< literal */
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SYM_TABLE, /*!< database table name */
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SYM_COLUMN, /*!< database table name */
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SYM_CURSOR, /*!< named cursor */
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SYM_PROCEDURE_NAME, /*!< stored procedure name */
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SYM_INDEX, /*!< database index name */
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SYM_FUNCTION /*!< user function name */
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};
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/** Symbol table node */
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struct sym_node_struct{
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que_common_t common; /*!< node type:
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QUE_NODE_SYMBOL */
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/* NOTE: if the data field in 'common.val' is not NULL and the symbol
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table node is not for a temporary column, the memory for the value has
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been allocated from dynamic memory and it should be freed when the
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symbol table is discarded */
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/* 'alias' and 'indirection' are almost the same, but not quite.
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'alias' always points to the primary instance of the variable, while
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'indirection' does the same only if we should use the primary
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instance's values for the node's data. This is usually the case, but
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when initializing a cursor (e.g., "DECLARE CURSOR c IS SELECT * FROM
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t WHERE id = x;"), we copy the values from the primary instance to
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the cursor's instance so that they are fixed for the duration of the
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cursor, and set 'indirection' to NULL. If we did not, the value of
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'x' could change between fetches and things would break horribly.
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TODO: It would be cleaner to make 'indirection' a boolean field and
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always use 'alias' to refer to the primary node. */
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sym_node_t* indirection; /*!< pointer to
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another symbol table
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node which contains
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the value for this
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node, NULL otherwise */
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sym_node_t* alias; /*!< pointer to
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another symbol table
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node for which this
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node is an alias,
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NULL otherwise */
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UT_LIST_NODE_T(sym_node_t) col_var_list; /*!< list of table
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columns or a list of
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input variables for an
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explicit cursor */
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ibool copy_val; /*!< TRUE if a column
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and its value should
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be copied to dynamic
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memory when fetched */
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ulint field_nos[2]; /*!< if a column, in
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the position
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SYM_CLUST_FIELD_NO is
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the field number in the
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clustered index; in
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the position
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SYM_SEC_FIELD_NO
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the field number in the
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non-clustered index to
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use first; if not found
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from the index, then
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ULINT_UNDEFINED */
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ibool resolved; /*!< TRUE if the
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meaning of a variable
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or a column has been
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resolved; for literals
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this is always TRUE */
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enum sym_tab_entry token_type; /*!< type of the
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parsed token */
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const char* name; /*!< name of an id */
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ulint name_len; /*!< id name length */
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dict_table_t* table; /*!< table definition
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if a table id or a
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column id */
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ulint col_no; /*!< column number if a
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column */
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sel_buf_t* prefetch_buf; /*!< NULL, or a buffer
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for cached column
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values for prefetched
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rows */
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sel_node_t* cursor_def; /*!< cursor definition
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select node if a
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named cursor */
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ulint param_type; /*!< PARS_INPUT,
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PARS_OUTPUT, or
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PARS_NOT_PARAM if not a
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procedure parameter */
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sym_tab_t* sym_table; /*!< back pointer to
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the symbol table */
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UT_LIST_NODE_T(sym_node_t) sym_list; /*!< list of symbol
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nodes */
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};
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/** Symbol table */
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struct sym_tab_struct{
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que_t* query_graph;
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/*!< query graph generated by the
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parser */
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const char* sql_string;
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/*!< SQL string to parse */
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size_t string_len;
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/*!< SQL string length */
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int next_char_pos;
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/*!< position of the next character in
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sql_string to give to the lexical
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analyzer */
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pars_info_t* info; /*!< extra information, or NULL */
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sym_node_list_t sym_list;
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/*!< list of symbol nodes in the symbol
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table */
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UT_LIST_BASE_NODE_T(func_node_t)
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func_node_list;
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/*!< list of function nodes in the
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parsed query graph */
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mem_heap_t* heap; /*!< memory heap from which we can
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allocate space */
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};
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#ifndef UNIV_NONINL
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#include "pars0sym.ic"
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#endif
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#endif
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