MySQL  8.0.19
Source Code Documentation
sp_instr_set_case_expr Class Reference

sp_instr_set_case_expr is used in the "simple CASE" implementation to evaluate and store the CASE-expression in the runtime context. More...

#include <sp_instr.h>

Inheritance diagram for sp_instr_set_case_expr:
sp_lex_branch_instr sp_lex_instr sp_branch_instr sp_instr sp_printable

Public Member Functions

 sp_instr_set_case_expr (uint ip, LEX *lex, uint case_expr_id, Item *case_expr_item, LEX_CSTRING case_expr_query)
 
virtual void print (const THD *thd, String *str)
 
virtual uint opt_mark (sp_head *sp, List< sp_instr > *leads)
 Mark this instruction as reachable during optimization and return the index to the next instruction. More...
 
virtual void opt_move (uint dst, List< sp_branch_instr > *ibp)
 Inform the instruction that it has been moved during optimization. More...
 
virtual void set_destination (uint old_dest, uint new_dest)
 Update the destination; used by the SP-instruction-optimizer. More...
 
virtual void backpatch (uint)
 Update all instruction with the given label in the backpatch list to the specified instruction pointer. More...
 
virtual bool exec_core (THD *thd, uint *nextp)
 Execute core function of instruction after all preparations (e.g. More...
 
virtual bool on_after_expr_parsing (THD *thd)
 Callback function which is called after the statement query string is successfully parsed, and the thread context has not been switched to the outer context. More...
 
virtual PSI_statement_infoget_psi_info ()
 
- Public Member Functions inherited from sp_lex_branch_instr
void set_cont_dest (uint cont_dest)
 
virtual uint get_cont_dest () const
 Get the continuation destination (instruction pointer for the CONTINUE HANDLER) of this instruction. More...
 
virtual bool is_invalid () const
 
virtual void invalidate ()
 Invalidate the object. More...
 
virtual LEX_CSTRING get_expr_query () const
 
- Public Member Functions inherited from sp_lex_instr
 sp_lex_instr (uint ip, sp_pcontext *ctx, LEX *lex, bool is_lex_owner)
 
virtual ~sp_lex_instr ()
 
bool validate_lex_and_execute_core (THD *thd, uint *nextp, bool open_tables)
 Make a few attempts to execute the instruction. More...
 
virtual SQL_I_List< Item_trigger_field > * get_instr_trig_field_list ()
 
virtual bool execute (THD *thd, uint *nextp)
 Execute this instruction. More...
 
- Public Member Functions inherited from sp_instr
 sp_instr (uint ip, sp_pcontext *ctx)
 
virtual ~sp_instr ()
 
uint get_ip () const
 
sp_pcontextget_parsing_ctx () const
 
virtual uint opt_shortcut_jump (sp_head *, sp_instr *start)
 Short-cut jumps to jumps during optimization. More...
 
bool opt_is_marked () const
 
- Public Member Functions inherited from sp_printable
virtual ~sp_printable ()
 
- Public Member Functions inherited from sp_branch_instr
virtual ~sp_branch_instr ()
 

Static Public Attributes

static PSI_statement_info psi_info
 

Private Attributes

uint m_case_expr_id
 Identifier (index) of the CASE-expression in the runtime context. More...
 

Additional Inherited Members

- Public Attributes inherited from sp_instr
Query_arena m_arena
 
- Protected Member Functions inherited from sp_lex_branch_instr
 sp_lex_branch_instr (uint ip, sp_pcontext *ctx, LEX *lex, Item *expr_item, LEX_CSTRING expr_query)
 
 sp_lex_branch_instr (uint ip, sp_pcontext *ctx, LEX *lex, Item *expr_item, LEX_CSTRING expr_query, uint dest)
 
- Protected Member Functions inherited from sp_lex_instr
virtual void get_query (String *sql_query) const
 Return the query string, which can be passed to the parser. More...
 
virtual void cleanup_before_parsing (THD *thd)
 Destroy items in the free list before re-parsing the statement query string (and thus, creating new items). More...
 
- Protected Member Functions inherited from sp_instr
void clear_da (THD *thd) const
 Clear diagnostics area. More...
 
- Protected Attributes inherited from sp_lex_branch_instr
uint m_dest
 Where we will go. More...
 
uint m_cont_dest
 Where continue handlers will go. More...
 
sp_instrm_optdest
 
sp_instrm_cont_optdest
 
Itemm_expr_item
 Expression item. More...
 
LEX_CSTRING m_expr_query
 SQL-query corresponding to the expression. More...
 
- Protected Attributes inherited from sp_lex_instr
LEXm_lex
 LEX-object. More...
 
- Protected Attributes inherited from sp_instr
bool m_marked
 Show if this instruction is reachable within the SP (used by SP-optimizer). More...
 
uint m_ip
 Instruction pointer. More...
 
sp_pcontextm_parsing_ctx
 Instruction parsing context. More...
 

Detailed Description

sp_instr_set_case_expr is used in the "simple CASE" implementation to evaluate and store the CASE-expression in the runtime context.

Constructor & Destructor Documentation

◆ sp_instr_set_case_expr()

sp_instr_set_case_expr::sp_instr_set_case_expr ( uint  ip,
LEX lex,
uint  case_expr_id,
Item case_expr_item,
LEX_CSTRING  case_expr_query 
)
inline

Member Function Documentation

◆ backpatch()

virtual void sp_instr_set_case_expr::backpatch ( uint  dest)
inlinevirtual

Update all instruction with the given label in the backpatch list to the specified instruction pointer.

Parameters
destdestination instruction pointer.

Reimplemented from sp_lex_branch_instr.

◆ exec_core()

bool sp_instr_set_case_expr::exec_core ( THD thd,
uint nextp 
)
virtual

Execute core function of instruction after all preparations (e.g.

setting of proper LEX, saving part of the thread context).

Parameters
thdThread context.
[out]nextpnext instruction pointer
Returns
Error flag.

Implements sp_lex_instr.

◆ get_psi_info()

virtual PSI_statement_info* sp_instr_set_case_expr::get_psi_info ( )
inlinevirtual

Implements sp_instr.

◆ on_after_expr_parsing()

virtual bool sp_instr_set_case_expr::on_after_expr_parsing ( THD thd)
inlinevirtual

Callback function which is called after the statement query string is successfully parsed, and the thread context has not been switched to the outer context.

The thread context contains new LEX-object corresponding to the parsed query string.

Parameters
thdThread context.
Returns
Error flag.

Reimplemented from sp_lex_instr.

◆ opt_mark()

uint sp_instr_set_case_expr::opt_mark ( sp_head ,
List< sp_instr > *  leads 
)
virtual

Mark this instruction as reachable during optimization and return the index to the next instruction.

Jump instruction will add their destination to the leads list.

Reimplemented from sp_lex_branch_instr.

◆ opt_move()

void sp_instr_set_case_expr::opt_move ( uint  dst,
List< sp_branch_instr > *  ibp 
)
virtual

Inform the instruction that it has been moved during optimization.

Most instructions will simply update its index, but jump instructions must also take care of their destination pointers. Forward jumps get pushed to the backpatch list 'ibp'.

Reimplemented from sp_lex_branch_instr.

◆ print()

void sp_instr_set_case_expr::print ( const THD thd,
String str 
)
virtual

Implements sp_printable.

◆ set_destination()

virtual void sp_instr_set_case_expr::set_destination ( uint  old_dest,
uint  new_dest 
)
inlinevirtual

Update the destination; used by the SP-instruction-optimizer.

Parameters
old_destcurrent (old) destination (instruction pointer).
new_destnew destination (instruction pointer).

Reimplemented from sp_lex_branch_instr.

Member Data Documentation

◆ m_case_expr_id

uint sp_instr_set_case_expr::m_case_expr_id
private

Identifier (index) of the CASE-expression in the runtime context.

◆ psi_info

PSI_statement_info sp_instr_set_case_expr::psi_info
static
Initial value:
= {0, "set_case_expr", 0,

The documentation for this class was generated from the following files:
PSI_DOCUMENT_ME
#define PSI_DOCUMENT_ME
Definition: psi_base.h:46