Added name to MEM_ROOT for esier debugging

This will make it easier to how memory allocation is done when debugging
with either DBUG or gdb.

Will especially help when debugging stored procedures

Main change is a name argument as second argument to init_alloc_root()
init_sql_alloc()

Other things:
- Added DBUG_ENTER/EXIT to some Virtual_tmp_table functions

1 files changed, 2 insertions, 1 deletions

diff --git a/mysys/tree.c b/mysys/tree.c
index c71925df7db..0dc57b6fffa 100644
--- a/mysys/tree.c
+++ b/mysys/tree.c
@@ -130,7 +130,8 @@ void init_tree(TREE *tree, size_t default_alloc_size, size_t memory_limit,
   }
   if (!(tree->with_delete= MY_TEST(my_flags & MY_TREE_WITH_DELETE)))
   {
-    init_alloc_root(&tree->mem_root, default_alloc_size, 0, MYF(my_flags));
+    init_alloc_root(&tree->mem_root, "tree", default_alloc_size, 0,
+                    MYF(my_flags));
     tree->mem_root.min_malloc= sizeof(TREE_ELEMENT)+tree->size_of_element;
   }
   DBUG_VOID_RETURN;