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Fixed BUG#15737: Stored procedure optimizer bug with LEAVE

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Second version.
  The problem was that the optimizer didn't work correctly with forwards jumps
  to "no-op" hpop and cpop instructions.
  Don't generate "no-op" instructions (hpop 0 and cpop 0), it isn't actually
  necessary.
This commit is contained in:
pem@mysql.com
2006-01-25 15:11:49 +01:00
parent 378147a23d
commit f60a763208
5 changed files with 321 additions and 39 deletions
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40
sql/sp_head.h
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@ -461,17 +461,34 @@ public:
virtual void backpatch(uint dest, sp_pcontext *dst_ctx)
{}
/*
Mark this instruction as reachable during optimization and return the
index to the next instruction. Jump instruction will mark their
destination too recursively.
*/
virtual uint opt_mark(sp_head *sp)
{
marked= 1;
return m_ip+1;
}
/*
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.
*/
virtual uint opt_shortcut_jump(sp_head *sp, sp_instr *start)
{
return m_ip;
}
/*
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'.
*/
virtual void opt_move(uint dst, List<sp_instr> *ibp)
{
m_ip= dst;
@ -696,6 +713,9 @@ public:
m_dest= dest;
}
/*
Update the destination; used by the optimizer.
*/
virtual void set_destination(uint old_dest, uint new_dest)
{
if (m_dest == old_dest)
@ -739,6 +759,7 @@ public:
virtual uint opt_mark(sp_head *sp);
/* Override sp_instr_jump's shortcut; we stop here */
virtual uint opt_shortcut_jump(sp_head *sp, sp_instr *start)
{
return m_ip;
@ -822,6 +843,7 @@ public:
virtual uint opt_mark(sp_head *sp);
/* Override sp_instr_jump's shortcut; we stop here. */
virtual uint opt_shortcut_jump(sp_head *sp, sp_instr *start)
{
return m_ip;
@ -859,15 +881,6 @@ public:
virtual void print(String *str);
virtual void backpatch(uint dest, sp_pcontext *dst_ctx);
virtual uint opt_mark(sp_head *sp)
{
if (m_count)
marked= 1;
return m_ip+1;
}
private:
uint m_count;
@ -953,15 +966,6 @@ public:
virtual void print(String *str);
virtual void backpatch(uint dest, sp_pcontext *dst_ctx);
virtual uint opt_mark(sp_head *sp)
{
if (m_count)
marked= 1;
return m_ip+1;
}
private:
uint m_count;