#include <sp_instr.h>

Inheritance diagram for sp_instr_jump:

Collaboration diagram for sp_instr_jump:

Public Member Functions
	sp_instr_jump (uint ip, sp_pcontext *ctx)
	sp_instr_jump (uint ip, sp_pcontext *ctx, uint dest)
virtual void	print (String *str)
virtual bool	execute (THD thd, uint nextp)
virtual uint	opt_mark (sp_head sp, List< sp_instr > leads)
virtual uint	opt_shortcut_jump (sp_head sp, sp_instr start)
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)
Public Member Functions inherited from sp_instr
	sp_instr (uint ip, sp_pcontext *ctx)
uint	get_ip () const
virtual uint	get_cont_dest () const
sp_pcontext *	get_parsing_ctx () const
bool	opt_is_marked () const

Protected Attributes
uint	m_dest
	Where we will go.
sp_instr *	m_optdest
Protected Attributes inherited from sp_instr
bool	m_marked
uint	m_ip
	Instruction pointer.
sp_pcontext *	m_parsing_ctx
	Instruction parsing context.

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

This is base class for all kinds of jump instructions.

Note: this is the only class, we directly construct instances of, that has subclasses. We also redefine sp_instr_jump behavior in those subclasses.

Todo:: later we will consider introducing a new class, which will be the base for sp_instr_jump, sp_instr_set_case_expr and sp_instr_jump_case_when. Something like sp_regular_branch_instr (similar to sp_lex_branch_instr).

Definition at line 658 of file sp_instr.h.

Member Function Documentation

virtual void sp_instr_jump::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_hpush_jump.

Definition at line 706 of file sp_instr.h.

virtual bool sp_instr_jump::execute	(	THD *	thd,
		uint *	nextp
	)

inlinevirtual

Execute this instruction

Parameters

	thd	Thread context
[out]	nextp	index of the next instruction to execute. (For most instructions this will be the instruction following this one). Note that this parameter is undefined in case of errors, use get_cont_dest() to find the continuation instruction for CONTINUE error handlers.

Returns: Error status.

Implements sp_instr.

Reimplemented in sp_instr_hreturn, and sp_instr_hpush_jump.

Definition at line 684 of file sp_instr.h.

uint sp_instr_jump::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_hreturn, and sp_instr_hpush_jump.

Definition at line 1022 of file sp_instr.cc.

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void sp_instr_jump::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.

Definition at line 1052 of file sp_instr.cc.

uint sp_instr_jump::opt_shortcut_jump	(	sp_head *	sp,
		sp_instr *	start
	)

virtual

Short-cut jumps to jumps during optimization. This is used by the jump instructions' opt_mark() methods. 'start' is the starting point, used to prevent the mark sweep from looping for ever. Return the end destination.

Reimplemented from sp_instr.

Reimplemented in sp_instr_hreturn, and sp_instr_hpush_jump.

Definition at line 1032 of file sp_instr.cc.

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