sp_instr_set_case_expr Class Reference

#include <sp_instr.h>

Inheritance diagram for sp_instr_set_case_expr:

List of all members.

Public Member Functions
	sp_instr_set_case_expr (uint ip, LEX *lex, uint case_expr_id, Item *case_expr_item, LEX_STRING case_expr_query)
virtual void	print (String *str)
virtual uint	opt_mark (sp_head *sp, List< sp_instr > *leads)
virtual void	opt_move (uint dst, List< sp_branch_instr > *ibp)
virtual void	set_destination (uint old_dest, uint new_dest)
virtual void	backpatch (uint dest)
virtual bool	exec_core (THD *thd, uint *nextp)
virtual bool	on_after_expr_parsing (THD *thd)

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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.

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Member Function Documentation

virtual void sp_instr_set_case_expr::backpatch

(

uint

dest

)

[inline, virtual]

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

Parameters:

dest	destination instruction pointer.

Reimplemented from sp_lex_branch_instr.

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:

thd	Thread context.
nextp[out]	next instruction pointer

Returns:

Error flag.

Implements sp_lex_instr.

virtual bool sp_instr_set_case_expr::on_after_expr_parsing

(

THD *

thd

)

[inline, virtual]

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:

thd	Thread context.

Returns:

Error flag.

Reimplemented from sp_lex_instr.

uint sp_instr_set_case_expr::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_lex_branch_instr.

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.

virtual void sp_instr_set_case_expr::set_destination	(	uint	old_dest,
		uint	new_dest
	)		[inline, virtual]

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

Parameters:

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

Reimplemented from sp_lex_branch_instr.

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

• sp_instr.h
• sp_instr.cc