database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-12-24 11:21:21 +03:00
Code Activity

Bug#42733: Type-punning warnings when compiling MySQL --

Browse Source 
strict aliasing violations.

One somewhat major source of strict-aliasing violations and
related warnings is the SQL_LIST structure. For example,
consider its member function `link_in_list` which takes
a pointer to pointer of type T (any type) as a pointer to
pointer to unsigned char. Dereferencing this pointer, which
is done to reset the next field, violates strict-aliasing
rules and might cause problems for surrounding code that
uses the next field of the object being added to the list.

The solution is to use templates to parametrize the SQL_LIST
structure in order to deference the pointers with compatible
types. As a side bonus, it becomes possible to remove quite
a few casts related to acessing data members of SQL_LIST.
This commit is contained in:
Davi Arnaut
2010-06-10 17:45:22 -03:00
parent bb036c93b4
commit 53b8829682
25 changed files with 216 additions and 210 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
sql/sql_table.cc
View File

@@ -4592,7 +4592,7 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
table->next_global= 0;
save_next_local= table->next_local;
table->next_local= 0;
select->table_list.first= (uchar*)table;
select->table_list.first= table;
/*
Time zone tables and SP tables can be add to lex->query_tables list,
so it have to be prepared.