sp_lex_branch_instr Class Reference

#include <sp_instr.h>

Inheritance diagram for sp_lex_branch_instr:

Collaboration diagram for sp_lex_branch_instr:

Public Member Functions
void	set_cont_dest (uint cont_dest)
virtual uint	opt_mark (sp_head *sp, List< sp_instr > *leads)
virtual void	opt_move (uint dst, List< sp_branch_instr > *ibp)
virtual uint	get_cont_dest () const
virtual bool	is_invalid () const
virtual void	invalidate ()
virtual LEX_STRING	get_expr_query () const
virtual void	set_destination (uint old_dest, uint new_dest)
virtual void	backpatch (uint dest)
Public Member Functions inherited from sp_lex_instr
	sp_lex_instr (uint ip, sp_pcontext *ctx, LEX *lex, bool is_lex_owner)
bool	validate_lex_and_execute_core (THD *thd, uint *nextp, bool open_tables)
virtual bool	execute (THD *thd, uint *nextp)
Public Member Functions inherited from sp_instr
	sp_instr (uint ip, sp_pcontext *ctx)
uint	get_ip () const
sp_pcontext *	get_parsing_ctx () const
virtual uint	opt_shortcut_jump (sp_head *sp, sp_instr *start)
bool	opt_is_marked () const
Public Member Functions inherited from sp_printable
virtual void	print (String *str)=0

Protected Member Functions
	sp_lex_branch_instr (uint ip, sp_pcontext *ctx, LEX *lex, Item *expr_item, LEX_STRING expr_query)
	sp_lex_branch_instr (uint ip, sp_pcontext *ctx, LEX *lex, Item *expr_item, LEX_STRING expr_query, uint dest)
Protected Member Functions inherited from sp_lex_instr
virtual bool	exec_core (THD *thd, uint *nextp)=0
virtual void	get_query (String *sql_query) const
virtual bool	on_after_expr_parsing (THD *thd)
virtual void	cleanup_before_parsing (THD *thd)

Protected Attributes
uint	m_dest
	Where we will go.
uint	m_cont_dest
	Where continue handlers will go.
sp_instr *	m_optdest
sp_instr *	m_cont_optdest
Item *	m_expr_item
	Expression item.
LEX_STRING	m_expr_query
	SQL-query corresponding to the expression.

Additional Inherited Members
Static Public Member Functions inherited from Sql_alloc
static void *	operator new (size_t size) throw ()
static void *	operator new[] (size_t size) throw ()
static void *	operator new[] (size_t size, MEM_ROOT *mem_root) throw ()
static void *	operator new (size_t size, MEM_ROOT *mem_root) throw ()
static void	operator delete (void *ptr, size_t size)
static void	operator delete (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, size_t size)

Detailed Description

sp_lex_branch_instr is a base class for SP-instructions, which might perform conditional jump depending on the value of an SQL-expression.

Definition at line 727 of file sp_instr.h.

Member Function Documentation

virtual void sp_lex_branch_instr::backpatch ( uint  dest )

inlinevirtual

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

Parameters

dest	destination instruction pointer.

Implements sp_branch_instr.

Reimplemented in sp_instr_set_case_expr.

Definition at line 795 of file sp_instr.h.

virtual uint sp_lex_branch_instr::get_cont_dest ( ) const

inlinevirtual

Get the continuation destination (instruction pointer for the CONTINUE HANDLER) of this instruction.

Returns

the continuation destination

Reimplemented from sp_instr.

Definition at line 766 of file sp_instr.h.

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virtual LEX_STRING sp_lex_branch_instr::get_expr_query ( ) const

inlinevirtual

Returns

the expression query string. This string can not be passed directly to the parser as it is most likely not a valid SQL-statement.

Note

as it can be seen in the get_query() implementation, get_expr_query() might return EMPTY_STR. EMPTY_STR means that no query-expression is available. That happens when class provides different implementation of get_query(). Strictly speaking, this is a drawback of the current class hierarchy.

Reimplemented from sp_lex_instr.

Definition at line 779 of file sp_instr.h.

virtual void sp_lex_branch_instr::invalidate ( )

inlinevirtual

Invalidate the object.

Implements sp_lex_instr.

Reimplemented in sp_instr_jump_case_when.

Definition at line 776 of file sp_instr.h.

virtual bool sp_lex_branch_instr::is_invalid ( ) const

inlinevirtual

Return values

false	if the object (i.e. LEX-object) is valid and exec_core() can be just called.
true	if the object is not valid any longer, exec_core() can not be called. The original query string should be re-parsed and a new LEX-object should be used.

Implements sp_lex_instr.

Definition at line 773 of file sp_instr.h.

uint sp_lex_branch_instr::opt_mark ( sp_head *  sp, 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_instr.

Reimplemented in sp_instr_set_case_expr.

Definition at line 1101 of file sp_instr.cc.

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void sp_lex_branch_instr::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_instr.

Reimplemented in sp_instr_set_case_expr.

Definition at line 1129 of file sp_instr.cc.

virtual void sp_lex_branch_instr::set_destination ( uint  old_dest, uint  new_dest  )

inlinevirtual

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

Parameters

old_dest	current (old) destination (instruction pointer).
new_dest	new destination (instruction pointer).

Implements sp_branch_instr.

Reimplemented in sp_instr_set_case_expr.

Definition at line 786 of file sp_instr.h.

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The documentation for this class was generated from the following files:

• sql/sp_instr.h
• sql/sp_instr.cc