Bug 8407, post review cleanup: use instr::get_cont_dest() to get the instruction

continuation instruction, for CONTINUE exception handlers.

sql/sp_head.cc

@@ -1078,7 +1078,7 @@ sp_head::execute(THD *thd)
       case SP_HANDLER_CONTINUE:
         thd->restore_active_arena(&execute_arena, &backup_arena);
         thd->set_n_backup_active_arena(&execute_arena, &backup_arena);
-        ctx->push_hstack(ip);
+        ctx->push_hstack(i->get_cont_dest());
         // Fall through
       default:
 	ip= hip;
@@ -2394,7 +2394,7 @@ sp_lex_keeper::reset_lex_and_exec_core(THD *thd, uint *nextp,
   reinit_stmt_before_use(thd, m_lex);
 
   if (open_tables)
-    res= instr->exec_open_and_lock_tables(thd, m_lex->query_tables, nextp);
+    res= instr->exec_open_and_lock_tables(thd, m_lex->query_tables);
 
   if (!res)
     res= instr->exec_core(thd, nextp);
@@ -2443,8 +2443,7 @@ sp_lex_keeper::reset_lex_and_exec_core(THD *thd, uint *nextp,
   sp_instr class functions
 */
 
-int sp_instr::exec_open_and_lock_tables(THD *thd, TABLE_LIST *tables,
-                                        uint *nextp)
+int sp_instr::exec_open_and_lock_tables(THD *thd, TABLE_LIST *tables)
 {
   int result;
 
@@ -2454,19 +2453,16 @@ int sp_instr::exec_open_and_lock_tables(THD *thd, TABLE_LIST *tables,
   */
   if (check_table_access(thd, SELECT_ACL, tables, 0)
       || open_and_lock_tables(thd, tables))
-  {
-    get_cont_dest(nextp);
     result= -1;
-  }
   else
     result= 0;
 
   return result;
 }
 
-void sp_instr::get_cont_dest(uint *nextp)
+uint sp_instr::get_cont_dest()
 {
-  *nextp= m_ip+1;
+  return (m_ip+1);
 }
 
 
@@ -2654,9 +2650,9 @@ sp_instr_set_trigger_field::print(String *str)
   sp_instr_opt_meta
 */
 
-void sp_instr_opt_meta::get_cont_dest(uint *nextp)
+uint sp_instr_opt_meta::get_cont_dest()
 {
-  *nextp= m_cont_dest;
+  return m_cont_dest;
 }
 
 
@@ -2748,7 +2744,6 @@ sp_instr_jump_if_not::exec_core(THD *thd, uint *nextp)
   if (! it)
   {
     res= -1;
-    *nextp = m_cont_dest;
   }
   else
   {
@@ -3317,7 +3312,6 @@ sp_instr_set_case_expr::exec_core(THD *thd, uint *nextp)
       spcont->clear_handler();
       thd->spcont= spcont;
     }
-    *nextp= m_cont_dest;        /* For continue handler */
   }
   else
     *nextp= m_ip+1;

sql/sp_head.h

@@ -449,13 +449,15 @@ public:
          thd        Thread handle
          nextp  OUT index of the next instruction to execute. (For most
                     instructions this will be the instruction following this
-                    one).
- 
-     RETURN 
-       0      on success, 
-       other  if some error occured
+                    one). Note that this parameter is undefined in case of
+                    errors, use get_cont_dest() to find the continuation
+                    instruction for CONTINUE error handlers.
+
+     RETURN
+       0      on success,
+       other  if some error occurred
   */
-  
+
   virtual int execute(THD *thd, uint *nextp) = 0;
 
   /**
@@ -463,22 +465,17 @@ public:
     Open and lock the tables used by this statement, as a pre-requisite
     to execute the core logic of this instruction with
     <code>exec_core()</code>.
-    If this statement fails, the next instruction to execute is also returned.
-    This is useful when a user defined SQL continue handler needs to be
-    executed.
     @param thd the current thread
     @param tables the list of tables to open and lock
-    @param nextp the continuation instruction, returned to the caller if this
-    method fails.
     @return zero on success, non zero on failure.
   */
-  int exec_open_and_lock_tables(THD *thd, TABLE_LIST *tables, uint *nextp);
+  int exec_open_and_lock_tables(THD *thd, TABLE_LIST *tables);
 
   /**
     Get the continuation destination of this instruction.
-    @param nextp the continuation destination (output)
+    @return the continuation destination
   */
-  virtual void get_cont_dest(uint *nextp);
+  virtual uint get_cont_dest();
 
   /*
     Execute core function of instruction after all preparations (e.g.
@@ -744,7 +741,7 @@ public:
   virtual void set_destination(uint old_dest, uint new_dest)
     = 0;
 
-  virtual void get_cont_dest(uint *nextp);
+  virtual uint get_cont_dest();
 
 protected: