Add 'extension' field to all client library structures to make them extensible

Reorder structure elements to make structures smaller and faster on 64 bit systems
This is a first step in cleaning up the client include files (but should be enough to allow us to do future fixes without breaking the library)
This change is part of WL#2872,  Make client library extensible.

configure.in

@@ -16,7 +16,7 @@ AM_CONFIG_HEADER(config.h)
 PROTOCOL_VERSION=10
 DOT_FRM_VERSION=6
 # See the libtool docs for information on how to do shared lib versions.
-SHARED_LIB_MAJOR_VERSION=15
+SHARED_LIB_MAJOR_VERSION=16
 SHARED_LIB_VERSION=$SHARED_LIB_MAJOR_VERSION:0:0
 NDB_SHARED_LIB_MAJOR_VERSION=3
 NDB_SHARED_LIB_VERSION=$NDB_SHARED_LIB_MAJOR_VERSION:0:0
@@ -1920,8 +1920,9 @@ AC_CHECK_FUNCS(alarm bcmp bfill bmove bsearch bzero \
   chsize cuserid fchmod fcntl \
   fconvert fdatasync finite fpresetsticky fpsetmask fsync ftruncate \
   getcwd gethostbyaddr_r gethostbyname_r getpass getpassphrase getpwnam \
-  getpwuid getrlimit getrusage getwd gmtime_r index initgroups isnan \
-  localtime_r locking longjmp lrand48 madvise mallinfo memcpy memmove \
+  getpwuid getrlimit getrusage getwd index initgroups isnan \
+  localtime_r gethrtime gmtime_r \
+  locking longjmp lrand48 madvise mallinfo memcpy memmove \
   mkstemp mlockall perror poll pread pthread_attr_create mmap mmap64 getpagesize \
   pthread_attr_getstacksize pthread_attr_setprio pthread_attr_setschedparam \
   pthread_attr_setstacksize pthread_condattr_create pthread_getsequence_np \

include/mysql.h

@@ -109,6 +109,7 @@ typedef struct st_mysql_field {
   unsigned int decimals;      /* Number of decimals in field */
   unsigned int charsetnr;     /* Character set */
   enum enum_field_types type; /* Type of field. See mysql_com.h for types */
+  void *extension;
 } MYSQL_FIELD;
 
 typedef char **MYSQL_ROW;		/* return data as array of strings */
@@ -143,12 +144,13 @@ typedef MYSQL_ROWS *MYSQL_ROW_OFFSET;	/* offset to current row */
 
 typedef struct embedded_query_result EMBEDDED_QUERY_RESULT;
 typedef struct st_mysql_data {
-  my_ulonglong rows;
-  unsigned int fields;
   MYSQL_ROWS *data;
+  struct embedded_query_result *embedded_info;
   MEM_ROOT alloc;
+  my_ulonglong rows;
+  unsigned int fields;
   /* extra info for embedded library */
-  struct embedded_query_result *embedded_info;
+  void *extension;
 } MYSQL_DATA;
 
 enum mysql_option 
@@ -211,6 +213,7 @@ struct st_mysql_options {
   void (*local_infile_end)(void *);
   int (*local_infile_error)(void *, char *, unsigned int);
   void *local_infile_userdata;
+  void *extension;
 };
 
 enum mysql_status 
@@ -300,12 +303,12 @@ typedef struct st_mysql
     from mysql_stmt_close if close had to cancel result set of this object.
   */
   my_bool *unbuffered_fetch_owner;
-#if defined(EMBEDDED_LIBRARY) || defined(EMBEDDED_LIBRARY_COMPATIBLE) || MYSQL_VERSION_ID >= 50100
   /* needed for embedded server - no net buffer to store the 'info' */
   char *info_buffer;
-#endif
+  void *extension;
 } MYSQL;
 
+
 typedef struct st_mysql_res {
   my_ulonglong  row_count;
   MYSQL_FIELD	*fields;
@@ -313,14 +316,15 @@ typedef struct st_mysql_res {
   MYSQL_ROWS	*data_cursor;
   unsigned long *lengths;		/* column lengths of current row */
   MYSQL		*handle;		/* for unbuffered reads */
-  MEM_ROOT	field_alloc;
-  unsigned int	field_count, current_field;
+  const struct st_mysql_methods *methods;
   MYSQL_ROW	row;			/* If unbuffered read */
   MYSQL_ROW	current_row;		/* buffer to current row */
+  MEM_ROOT	field_alloc;
+  unsigned int	field_count, current_field;
   my_bool	eof;			/* Used by mysql_fetch_row */
   /* mysql_stmt_close() had to cancel this result */
   my_bool       unbuffered_fetch_cancelled;  
-  const struct st_mysql_methods *methods;
+  void *extension;
 } MYSQL_RES;
 
 #define MAX_MYSQL_MANAGER_ERR 256  
@@ -340,21 +344,23 @@ typedef struct st_mysql_res {
 typedef struct st_mysql_manager
 {
   NET net;
-  char *host,*user,*passwd;
+  char *host, *user, *passwd;
+  char *net_buf, *net_buf_pos, *net_data_end;
   unsigned int port;
-  my_bool free_me;
-  my_bool eof;
   int cmd_status;
   int last_errno;
-  char* net_buf,*net_buf_pos,*net_data_end;
   int net_buf_size;
+  my_bool free_me;
+  my_bool eof;
   char last_error[MAX_MYSQL_MANAGER_ERR];
+  void *extension;
 } MYSQL_MANAGER;
 
 typedef struct st_mysql_parameters
 {
   unsigned long *p_max_allowed_packet;
   unsigned long *p_net_buffer_length;
+  void *extension;
 } MYSQL_PARAMETERS;
 
 #if !defined(MYSQL_SERVER) && !defined(EMBEDDED_LIBRARY)
@@ -369,6 +375,7 @@ typedef struct st_mysql_parameters
 */
 int STDCALL mysql_server_init(int argc, char **argv, char **groups);
 void STDCALL mysql_server_end(void);
+
 /*
   mysql_server_init/end need to be called when using libmysqld or
   libmysqlclient (exactly, mysql_server_init() is called by mysql_init() so
@@ -657,23 +664,24 @@ typedef struct st_mysql_bind
   void		*buffer;	  /* buffer to get/put data */
   /* set this if you want to track data truncations happened during fetch */
   my_bool       *error;
-  enum enum_field_types buffer_type;	/* buffer type */
+  unsigned char *row_ptr;         /* for the current data position */
+  void (*store_param_func)(NET *net, struct st_mysql_bind *param);
+  void (*fetch_result)(struct st_mysql_bind *, MYSQL_FIELD *,
+                       unsigned char **row);
+  void (*skip_result)(struct st_mysql_bind *, MYSQL_FIELD *,
+		      unsigned char **row);
   /* output buffer length, must be set when fetching str/binary */
   unsigned long buffer_length;
-  unsigned char *row_ptr;         /* for the current data position */
   unsigned long offset;           /* offset position for char/binary fetch */
   unsigned long	length_value;     /* Used if length is 0 */
   unsigned int	param_number;	  /* For null count and error messages */
   unsigned int  pack_length;	  /* Internal length for packed data */
+  enum enum_field_types buffer_type;	/* buffer type */
   my_bool       error_value;      /* used if error is 0 */
   my_bool       is_unsigned;      /* set if integer type is unsigned */
   my_bool	long_data_used;	  /* If used with mysql_send_long_data */
   my_bool	is_null_value;    /* Used if is_null is 0 */
-  void (*store_param_func)(NET *net, struct st_mysql_bind *param);
-  void (*fetch_result)(struct st_mysql_bind *, MYSQL_FIELD *,
-                       unsigned char **row);
-  void (*skip_result)(struct st_mysql_bind *, MYSQL_FIELD *,
-		      unsigned char **row);
+  void *extension;
 } MYSQL_BIND;
 
 
@@ -688,15 +696,15 @@ typedef struct st_mysql_stmt
   MYSQL_FIELD    *fields;              /* result set metadata */
   MYSQL_DATA     result;               /* cached result set */
   MYSQL_ROWS     *data_cursor;         /* current row in cached result */
-  /* copy of mysql->affected_rows after statement execution */
-  my_ulonglong   affected_rows;
-  my_ulonglong   insert_id;            /* copy of mysql->insert_id */
   /*
     mysql_stmt_fetch() calls this function to fetch one row (it's different
     for buffered, unbuffered and cursor fetch).
   */
   int            (*read_row_func)(struct st_mysql_stmt *stmt, 
                                   unsigned char **row);
+  /* copy of mysql->affected_rows after statement execution */
+  my_ulonglong   affected_rows;
+  my_ulonglong   insert_id;            /* copy of mysql->insert_id */
   unsigned long	 stmt_id;	       /* Id for prepared statement */
   unsigned long  flags;                /* i.e. type of cursor to open */
   unsigned long  prefetch_rows;        /* number of rows per one COM_FETCH */
@@ -722,6 +730,7 @@ typedef struct st_mysql_stmt
     metadata fields when doing mysql_stmt_store_result.
   */
   my_bool       update_max_length;     
+  void *extension;
 } MYSQL_STMT;
 
 enum enum_stmt_attr_type

include/mysql_com.h

@@ -186,25 +186,25 @@ typedef struct st_vio Vio;
 
 typedef struct st_net {
 #if !defined(CHECK_EMBEDDED_DIFFERENCES) || !defined(EMBEDDED_LIBRARY)
-  Vio* vio;
+  Vio *vio;
   unsigned char *buff,*buff_end,*write_pos,*read_pos;
   my_socket fd;					/* For Perl DBI/dbd */
-  unsigned long max_packet,max_packet_size;
-  unsigned int pkt_nr,compress_pkt_nr;
-  unsigned int write_timeout, read_timeout, retry_count;
-  int fcntl;
-  my_bool compress;
   /*
     The following variable is set if we are doing several queries in one
     command ( as in LOAD TABLE ... FROM MASTER ),
     and do not want to confuse the client with OK at the wrong time
   */
   unsigned long remain_in_buf,length, buf_length, where_b;
+  unsigned long max_packet,max_packet_size;
+  unsigned int pkt_nr,compress_pkt_nr;
+  unsigned int write_timeout, read_timeout, retry_count;
+  int fcntl;
   unsigned int *return_status;
   unsigned char reading_or_writing;
   char save_char;
   my_bool no_send_ok;  /* For SPs and other things that do multiple stmts */
   my_bool no_send_eof; /* For SPs' first version read-only cursors */
+  my_bool compress;
   /*
     Set if OK packet is already sent, and we do not need to send error
     messages
@@ -215,20 +215,20 @@ typedef struct st_net {
     queries in cache that have not stored its results yet
   */
 #endif
-  char last_error[MYSQL_ERRMSG_SIZE], sqlstate[SQLSTATE_LENGTH+1];
-  unsigned int last_errno;
-  unsigned char error;
-
   /*
     'query_cache_query' should be accessed only via query cache
     functions and methods to maintain proper locking.
   */
   unsigned char *query_cache_query;
-
+  unsigned int last_errno;
+  unsigned char error;
   my_bool report_error; /* We should report error (we have unreported error) */
   my_bool return_errno;
+  char last_error[MYSQL_ERRMSG_SIZE], sqlstate[SQLSTATE_LENGTH+1];
+  void *extension;
 } NET;
 
+
 #define packet_error (~(unsigned long) 0)
 
 enum enum_field_types { MYSQL_TYPE_DECIMAL, MYSQL_TYPE_TINY,
@@ -389,6 +389,7 @@ typedef struct st_udf_args
   char *maybe_null;			/* Set to 1 for all maybe_null args */
   char **attributes;                    /* Pointer to attribute name */
   unsigned long *attribute_lengths;     /* Length of attribute arguments */
+  void *extension;
 } UDF_ARGS;
 
   /* This holds information about the result */
@@ -399,7 +400,9 @@ typedef struct st_udf_init
   unsigned int decimals;		/* for real functions */
   unsigned long max_length;		/* For string functions */
   char	  *ptr;				/* free pointer for function data */
-  my_bool const_item;			/* 0 if result is independent of arguments */
+  /* 0 if result is independent of arguments */
+  my_bool const_item;
+  void *extension;
 } UDF_INIT;
 
   /* Constants when using compression */