pars0pars.h

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/** @file include/pars0pars.h
 SQL parser
 
 Created 11/19/1996 Heikki Tuuri
 *******************************************************/
 
#ifndef pars0pars_h
#define pars0pars_h
 
#include "pars0types.h"
#include "que0types.h"
#include "row0mysql.h"
#include "row0types.h"
#include "trx0types.h"
#include "univ.i"
#include "usr0types.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 bool (*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;
 
/* Global variable used while parsing a single procedure or query : the code is
NOT re-entrant */
extern sym_tab_t *pars_sym_tab_global;
 
/** Mutex to protect the sql parser */
extern ib_mutex_t pars_mutex;
 
extern pars_res_word_t pars_to_binary_token;
extern pars_res_word_t pars_substr_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_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_bigint_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);
 
/** Initialize for the internal parser */
void pars_init();
 
/** Clean up the internal parser */
void pars_close();
 
/** Parses an SQL string returning the query graph.
 @return own: the query graph */
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.
@param[in,out] buf Buffer where to copy
@param[in] max_size Maximum number of characters which fit in the buffer
@return number of characters copied or 0 on EOF
*/
int pars_get_lex_chars(char *buf, size_t max_size);
 
/** Called by yyparse on error. */
void yyerror(const char *s); /*!< in: error message string */
/** Parses a variable declaration.
 @return own: symbol table node of type SYM_VAR */
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 */
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 */
/*************************************************************************
Rebind a LIKE search string. NOTE: We ignore any '%' characters embedded
within the search string.
@return own: function node in a query tree */
int pars_like_rebind(sym_node_t *node, /* in: The search string node.*/
                     const byte *ptr,  /* in: literal to (re) bind */
                     ulint len);       /* in: length of literal to (re) bind*/
/** Parses an operator expression.
 @return own: function node in a query tree */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
upd_node_t *pars_update_statement_start(
    bool 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 */
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 */
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 */
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 */
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 */
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 */
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 */
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 */
exit_node_t *pars_exit_statement(void);
/** Parses a return-statement.
 @return return-statement node */
return_node_t *pars_return_statement(void);
/** Parses an assignment statement.
 @return assignment statement node */
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 */
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 */
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 commit statement.
 @return own: commit node struct */
commit_node_t *pars_commit_statement(void);
/** Parses a rollback statement.
 @return own: rollback node struct */
roll_node_t *pars_rollback_statement(void);
/** Parses a column definition at a table creation.
 @return column sym table node */
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.
@param[in]      table_sym               table name node in the symbol table
@param[in]      column_defs             list of column names
@param[in]      not_fit_in_memory       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
@param[in]      compact                 non-NULL if COMPACT table
@param[in]      block_size              block size (can be NULL)
@return table create subgraph */
tab_node_t *pars_create_table(sym_node_t *table_sym, sym_node_t *column_defs,
                              sym_node_t *compact, sym_node_t *block_size,
                              void *not_fit_in_memory);
 
/** Parses an index creation operation.
@param[in] unique_def Not NULL if a unique index.
@param[in] clustered_def Not NULL if a clustered index.
@param[in] index_sym Index name node in the symbol table.
@param[in] table_sym Table name node in the symbol table.
@param[in] column_list List of column names.
@return index create subgraph */
ind_node_t *pars_create_index(pars_res_word_t *unique_def,
                              pars_res_word_t *clustered_def,
                              sym_node_t *index_sym, sym_node_t *table_sym,
                              sym_node_t *column_list);
/** Parses a procedure definition.
 @return query fork node */
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 */
 
/** 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.
@param[in]      node            root node for an incomplete query
                                graph, or NULL for dummy graph
@param[in]      trx             transaction handle
@param[in]      heap            memory heap from which allocated
@param[in]      prebuilt        row prebuilt structure
@return query thread node to run */
[[nodiscard]] que_thr_t *pars_complete_graph_for_exec(que_node_t *node,
                                                      trx_t *trx,
                                                      mem_heap_t *heap,
                                                      row_prebuilt_t *prebuilt);
 
/** Create parser info struct.
 @return own: info struct */
pars_info_t *pars_info_create(void);
 
/** Free info struct and everything it contains. */
void pars_info_free(pars_info_t *info); /*!< in, own: info struct */
 
/** Add bound literal.
@param[in] info Info struct
@param[in] name Name
@param[in] address Address
@param[in] length Length of data
@param[in] type Type, e.g. data_fixbinary
@param[in] prtype Precise type, e.g. data_unsigned */
void pars_info_add_literal(pars_info_t *info, const char *name,
                           const void *address, ulint length, ulint type,
                           ulint prtype);
 
/** Equivalent to pars_info_add_literal(info, name, str, strlen(str),
 DATA_VARCHAR, DATA_ENGLISH).
@param[in] info Info struct
@param[in] name Name
@param[in] str String */
void pars_info_add_str_literal(pars_info_t *info, const char *name,
                               const char *str);
 
/********************************************************************
If the literal value already exists then it rebinds otherwise it
creates a new entry.*/
void pars_info_bind_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. */
 
/** If the literal value already exists then it rebinds otherwise it
creates a new entry.
@param[in] info Info struct
@param[in] name Name
@param[in] str String
@param[in] str_len String length */
void pars_info_bind_varchar_literal(pars_info_t *info, const char *name,
                                    const byte *str, ulint str_len);
 
/** If the literal value already exists then it rebinds otherwise it creates a
new entry.
@param[in]  info  Info struct
@param[in]  name  Name
@param[in]  val   Value */
void pars_info_bind_int4_literal(pars_info_t *info, const char *name,
                                 const uint32_t *val);
 
/** If the literal value already exists then it rebinds otherwise it creates a
new entry.
@param[in]  info  Info struct
@param[in]  name  Name
@param[in]  val   Value */
void pars_info_bind_int8_literal(pars_info_t *info, const char *name,
                                 const uint64_t *val);
 
/** Add user function.
@param[in] info Info struct
@param[in] name Function name
@param[in] func Function address
@param[in] arg User-supplied argument */
void pars_info_bind_function(pars_info_t *info, const char *name,
                             pars_user_func_cb_t func, void *arg);
 
/** Add bound id.
@param[in]      info            info struct
@param[in]      copy_name       copy name if true
@param[in]      name            name
@param[in]      id              id */
void pars_info_bind_id(pars_info_t *info, bool copy_name, const char *name,
                       const char *id);
 
/** 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. */
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. */
void pars_info_add_ull_literal(pars_info_t *info, /*!< in: info struct */
                               const char *name,  /*!< in: name */
                               uint64_t val);     /*!< in: value */
 
/** If the literal value already exists then it rebinds otherwise it
 creates a new entry.
@param[in] info Info struct
@param[in] name Name
@param[in] val Value */
void pars_info_bind_ull_literal(pars_info_t *info, const char *name,
                                const uint64_t *val);
 
/** Add bound id.
@param[in]      info    info struct
@param[in]      name    name
@param[in]      id      id */
void pars_info_add_id(pars_info_t *info, const char *name, const char *id);
 
/** Get bound literal with the given name.
 @return bound literal, or NULL if not found */
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 identifier with the given name.
@param[in]      info    info struct
@param[in]      name    bound id name to find
@return bound id, or NULL if not found */
pars_bound_id_t *pars_info_get_bound_id(pars_info_t *info, const char *name);
 
/** Release any resources used by the lexer. */
void pars_lexer_close(void);
 
/** Extra information supplied for pars_sql(). */
struct pars_info_t {
  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*) */
 
  bool graph_owns_us; /*!< if true (which is the default),
                       que_graph_free() will free us */
};
 
/** User-supplied function and argument. */
struct pars_user_func_t {
  const char *name;         /*!< function name */
  pars_user_func_cb_t func; /*!< function address */
  void *arg;                /*!< user-supplied argument */
};
 
/** Bound literal. */
struct pars_bound_lit_t {
  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 */
  sym_node_t *node;    /*!< symbol node */
};
 
/** Bound identifier. */
struct pars_bound_id_t {
  const char *name; /*!< name */
  const char *id;   /*!< identifier */
};
 
/** Struct used to denote a reserved word in a parsing tree */
struct pars_res_word_t {
  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_t {
  que_common_t common; /*!< type: QUE_NODE_FUNC */
  int func;            /*!< token code of the function name */
  ulint fclass;        /*!< 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 */
};
 
UT_LIST_NODE_GETTER_DEFINITION(func_node_t, cond_list)
 
UT_LIST_NODE_GETTER_DEFINITION(func_node_t, func_node_list)
 
/** An order-by node in a select */
struct order_node_t {
  que_common_t common; /*!< type: QUE_NODE_ORDER */
  sym_node_t *column;  /*!< order-by column */
  bool asc;            /*!< true if ascending, false if descending */
};
 
/** Procedure definition node */
struct proc_node_t {
  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_t {
  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_t {
  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_t {
  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_t {
  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_t {
  que_common_t common; /*!< type: QUE_NODE_EXIT */
};
 
/** return-statement node */
struct return_node_t {
  que_common_t common; /*!< type: QUE_NODE_RETURN */
};
 
/** Assignment statement node */
struct assign_node_t {
  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_t {
  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., := */
/** @} */
 
#include "pars0pars.ic"
 
#endif