[Maria-developers] A mess with sql_alloc() ?

8 Oct 2009

      I need to use sql_string.* and sql_list.* in MYSQL_CLIENT context (mysqlbinlog.cc).
sql_list.h refers to sql_alloc() function which originally has "THD dependent"
implementation:

mysql_priv.h:

        #ifndef MYSQL_CLIENT
        ...
(1)    void *sql_alloc(size_t);
        ...
        #endif

thr_malloc.cc:

        void *sql_alloc(size_t Size)
        {
          MEM_ROOT *root= *my_pthread_getspecific_ptr(MEM_ROOT**,THR_MALLOC);
          return alloc_root(root,Size);
        }

So I redefined sql_alloc() in a client context:

        void *sql_alloc(size_t size) { ... }
        ...
        #include "sql_string.h"
        #include "sql_list.h"

And this appeared to run into conflict with

sql/sql_string.cc:

(2)     extern uchar* sql_alloc(unsigned size);

Moreover I found the following declaration

client\sql_string.cc:

(3)     extern void sql_alloc(size_t size);

Isn't it a mess: compare (1), (2) and (3) ?
Actually, looks like both (2) & (3) are reducible:
- I found no direct usage of sql_alloc() in sql_string.* files;
- After commenting (2) & (3) out the rebuild was successfull.
If (2) & (3) shouldn't be deleted, then they should be brought
in correspondence with (1). If not, what should I do to redefine
sql_alloc()?

Looks like along with sql_alloc(), we can delete similar declarations
(2a) & (3a) of sql_element_free() (and actually all occurences of this function):

mysql_priv.h

        #ifndef MYSQL_CLIENT
        ...
(1a)    void sql_element_free(void *ptr);
        ...
        #endif

thr_malloc.cc

        void sql_element_free(void *ptr __attribute__((unused)))
        {} /* purecov: deadcode */

sql/sql_string.cc

(2a)    extern void sql_element_free(void *ptr);

client/sql_string.cc

(3a)    extern void sql_element_free(void *ptr);

Indeed, besides pointed above we find only the following
occurences of sql_element_free():

client/mysql.cc

         void* sql_alloc(unsigned size);
         void sql_element_free(void *ptr);
         ...
         void *sql_alloc(size_t Size)
         {
           return my_malloc(Size,MYF(MY_WME));
         }
         void sql_element_free(void *ptr)
         {
           my_free(ptr,MYF(0));
         }

So sql_element_free() is called nowhere (note also that this function
has a do-nothing body).

[Maria-developers] A mess with sql_alloc() ?

Alexi1952