mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-16 12:02:42 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
mariadb/sql/unireg.cc
Davi Arnaut f56dd32bf7 Bug#34043: Server loops excessively in _checkchunk() when safemalloc is enabled 
Essentially, the problem is that safemalloc is excruciatingly
slow as it checks all allocated blocks for overrun at each
memory management primitive, yielding a almost exponential
slowdown for the memory management functions (malloc, realloc,
free). The overrun check basically consists of verifying some
bytes of a block for certain magic keys, which catches some
simple forms of overrun. Another minor problem is violation
of aliasing rules and that its own internal list of blocks
is prone to corruption.

Another issue with safemalloc is rather the maintenance cost
as the tool has a significant impact on the server code.
Given the magnitude of memory debuggers available nowadays,
especially those that are provided with the platform malloc
implementation, maintenance of a in-house and largely obsolete
memory debugger becomes a burden that is not worth the effort
due to its slowness and lack of support for detecting more
common forms of heap corruption.

Since there are third-party tools that can provide the same
functionality at a lower or comparable performance cost, the
solution is to simply remove safemalloc. Third-party tools
can provide the same functionality at a lower or comparable
performance cost. 

The removal of safemalloc also allows a simplification of the
malloc wrappers, removing quite a bit of kludge: redefinition
of my_malloc, my_free and the removal of the unused second
argument of my_free. Since free() always check whether the
supplied pointer is null, redudant checks are also removed.

Also, this patch adds unit testing for my_malloc and moves
my_realloc implementation into the same file as the other
memory allocation primitives.

client/mysqldump.c:
  Pass my_free directly as its signature is compatible with the
  callback type -- which wasn't the case for free_table_ent.
2010-07-08 18:20:08 -03:00

1101 lines
35 KiB
C++
Raw Blame History

/* Copyright (C) 2000-2006 MySQL AB, 2008-2009 Sun Microsystems, Inc
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
Functions to create a unireg form-file from a FIELD and a fieldname-fieldinfo
struct.
In the following functions FIELD * is an ordinary field-structure with
the following exeptions:
sc_length,typepos,row,kol,dtype,regnr and field need not to be set.
str is a (long) to record position where 0 is the first position.
*/
#include "sql_priv.h"
#include "unireg.h"
#include "sql_partition.h" // struct partition_info
#include "sql_table.h" // check_duplicate_warning
#include "sql_class.h" // THD, Internal_error_handler
#include <m_ctype.h>
#include <assert.h>
#define FCOMP 17 /* Bytes for a packed field */
static uchar * pack_screens(List<Create_field> &create_fields,
uint *info_length, uint *screens, bool small_file);
static uint pack_keys(uchar *keybuff,uint key_count, KEY *key_info,
ulong data_offset);
static bool pack_header(uchar *forminfo,enum legacy_db_type table_type,
List<Create_field> &create_fields,
uint info_length, uint screens, uint table_options,
ulong data_offset, handler *file);
static uint get_interval_id(uint *,List<Create_field> &, Create_field *);
static bool pack_fields(File file, List<Create_field> &create_fields,
ulong data_offset);
static bool make_empty_rec(THD *thd, int file, enum legacy_db_type table_type,
uint table_options,
List<Create_field> &create_fields,
uint reclength, ulong data_offset,
handler *handler);
/**
An interceptor to hijack ER_TOO_MANY_FIELDS error from
pack_screens and retry again without UNIREG screens.
XXX: what is a UNIREG screen?
*/
struct Pack_header_error_handler: public Internal_error_handler
{
virtual bool handle_condition(THD *thd,
uint sql_errno,
const char* sqlstate,
MYSQL_ERROR::enum_warning_level level,
const char* msg,
MYSQL_ERROR ** cond_hdl);
bool is_handled;
Pack_header_error_handler() :is_handled(FALSE) {}
};
bool
Pack_header_error_handler::
handle_condition(THD *,
uint sql_errno,
const char*,
MYSQL_ERROR::enum_warning_level,
const char*,
MYSQL_ERROR ** cond_hdl)
{
*cond_hdl= NULL;
is_handled= (sql_errno == ER_TOO_MANY_FIELDS);
return is_handled;
}
/*
Create a frm (table definition) file
SYNOPSIS
mysql_create_frm()
thd Thread handler
file_name Path for file (including database and .frm)
db Name of database
table Name of table
create_info create info parameters
create_fields Fields to create
keys number of keys to create
key_info Keys to create
db_file Handler to use. May be zero, in which case we use
create_info->db_type
RETURN
false ok
true error
*/
bool mysql_create_frm(THD *thd, const char *file_name,
const char *db, const char *table,
HA_CREATE_INFO *create_info,
List<Create_field> &create_fields,
uint keys, KEY *key_info,
handler *db_file)
{
LEX_STRING str_db_type;
uint reclength, info_length, screens, key_info_length, maxlength, tmp_len, i;
ulong key_buff_length;
File file;
ulong filepos, data_offset;
uchar fileinfo[64],forminfo[288],*keybuff;
uchar *screen_buff;
char buff[128];
#ifdef WITH_PARTITION_STORAGE_ENGINE
partition_info *part_info= thd->work_part_info;
#endif
Pack_header_error_handler pack_header_error_handler;
int error;
DBUG_ENTER("mysql_create_frm");
DBUG_ASSERT(*fn_rext((char*)file_name)); // Check .frm extension
if (!(screen_buff=pack_screens(create_fields,&info_length,&screens,0)))
DBUG_RETURN(1);
DBUG_ASSERT(db_file != NULL);
/* If fixed row records, we need one bit to check for deleted rows */
if (!(create_info->table_options & HA_OPTION_PACK_RECORD))
create_info->null_bits++;
data_offset= (create_info->null_bits + 7) / 8;
thd->push_internal_handler(&pack_header_error_handler);
error= pack_header(forminfo, ha_legacy_type(create_info->db_type),
create_fields,info_length,
screens, create_info->table_options,
data_offset, db_file);
thd->pop_internal_handler();
if (error)
{
my_free(screen_buff);
if (! pack_header_error_handler.is_handled)
DBUG_RETURN(1);
// Try again without UNIREG screens (to get more columns)
if (!(screen_buff=pack_screens(create_fields,&info_length,&screens,1)))
DBUG_RETURN(1);
if (pack_header(forminfo, ha_legacy_type(create_info->db_type),
create_fields,info_length,
screens, create_info->table_options, data_offset, db_file))
{
my_free(screen_buff);
DBUG_RETURN(1);
}
}
reclength=uint2korr(forminfo+266);
/* Calculate extra data segment length */
str_db_type.str= (char *) ha_resolve_storage_engine_name(create_info->db_type);
str_db_type.length= strlen(str_db_type.str);
/* str_db_type */
create_info->extra_size= (2 + str_db_type.length +
2 + create_info->connect_string.length);
/*
Partition:
Length of partition info = 4 byte
Potential NULL byte at end of partition info string = 1 byte
Indicator if auto-partitioned table = 1 byte
=> Total 6 byte
*/
create_info->extra_size+= 6;
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (part_info)
{
create_info->extra_size+= part_info->part_info_len;
}
#endif
for (i= 0; i < keys; i++)
{
if (key_info[i].parser_name)
create_info->extra_size+= key_info[i].parser_name->length + 1;
}
/*
This gives us the byte-position of the character at
(character-position, not byte-position) TABLE_COMMENT_MAXLEN.
The trick here is that character-positions start at 0, so the last
character in a maximum-allowed length string would be at char-pos
MAXLEN-1; charpos MAXLEN will be the position of the terminator.
Consequently, bytepos(charpos(MAXLEN)) should be equal to
comment[length] (which should also be the terminator, or at least
the first byte after the payload in the strict sense). If this is
not so (bytepos(charpos(MAXLEN)) comes /before/ the end of the
string), the string is too long.
For additional credit, realise that UTF-8 has 1-3 bytes before 6.0,
and 1-4 bytes in 6.0 (6.0 also has UTF-32).
*/
tmp_len= system_charset_info->cset->charpos(system_charset_info,
create_info->comment.str,
create_info->comment.str +
create_info->comment.length,
TABLE_COMMENT_MAXLEN);
if (tmp_len < create_info->comment.length)
{
char *real_table_name= (char*) table;
List_iterator<Create_field> it(create_fields);
Create_field *field;
while ((field=it++))
{
if (field->field && field->field->table &&
(real_table_name= field->field->table->s->table_name.str))
break;
}
if ((thd->variables.sql_mode &
(MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES)))
{
my_error(ER_TOO_LONG_TABLE_COMMENT, MYF(0),
real_table_name, (uint) TABLE_COMMENT_MAXLEN);
my_free(screen_buff);
DBUG_RETURN(1);
}
char warn_buff[MYSQL_ERRMSG_SIZE];
my_snprintf(warn_buff, sizeof(warn_buff), ER(ER_TOO_LONG_TABLE_COMMENT),
real_table_name, (uint) TABLE_COMMENT_MAXLEN);
/* do not push duplicate warnings */
if (!check_duplicate_warning(current_thd, warn_buff, strlen(warn_buff)))
push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TOO_LONG_TABLE_COMMENT, warn_buff);
create_info->comment.length= tmp_len;
}
/*
If table comment is longer than TABLE_COMMENT_INLINE_MAXLEN bytes,
store the comment in an extra segment (up to TABLE_COMMENT_MAXLEN bytes).
Pre 6.0, the limit was 60 characters, with no extra segment-handling.
*/
if (create_info->comment.length > TABLE_COMMENT_INLINE_MAXLEN)
{
forminfo[46]=255;
create_info->extra_size+= 2 + create_info->comment.length;
}
else{
strmake((char*) forminfo+47, create_info->comment.str ?
create_info->comment.str : "", create_info->comment.length);
forminfo[46]=(uchar) create_info->comment.length;
}
if ((file=create_frm(thd, file_name, db, table, reclength, fileinfo,
create_info, keys, key_info)) < 0)
{
my_free(screen_buff);
DBUG_RETURN(1);
}
key_buff_length= uint4korr(fileinfo+47);
keybuff=(uchar*) my_malloc(key_buff_length, MYF(0));
key_info_length= pack_keys(keybuff, keys, key_info, data_offset);
/*
Ensure that there are no forms in this newly created form file.
Even if the form file exists, create_frm must truncate it to
ensure one form per form file.
*/
DBUG_ASSERT(uint2korr(fileinfo+8) == 0);
if (!(filepos= make_new_entry(file, fileinfo, NULL, "")))
goto err;
maxlength=(uint) next_io_size((ulong) (uint2korr(forminfo)+1000));
int2store(forminfo+2,maxlength);
int4store(fileinfo+10,(ulong) (filepos+maxlength));
fileinfo[26]= (uchar) test((create_info->max_rows == 1) &&
(create_info->min_rows == 1) && (keys == 0));
int2store(fileinfo+28,key_info_length);
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (part_info)
{
fileinfo[61]= (uchar) ha_legacy_type(part_info->default_engine_type);
DBUG_PRINT("info", ("part_db_type = %d", fileinfo[61]));
}
#endif
int2store(fileinfo+59,db_file->extra_rec_buf_length());
if (mysql_file_pwrite(file, fileinfo, 64, 0L, MYF_RW) ||
mysql_file_pwrite(file, keybuff, key_info_length,
(ulong) uint2korr(fileinfo+6), MYF_RW))
goto err;
mysql_file_seek(file,
(ulong) uint2korr(fileinfo+6) + (ulong) key_buff_length,
MY_SEEK_SET, MYF(0));
if (make_empty_rec(thd,file,ha_legacy_type(create_info->db_type),
create_info->table_options,
create_fields,reclength, data_offset, db_file))
goto err;
int2store(buff, create_info->connect_string.length);
if (mysql_file_write(file, (const uchar*)buff, 2, MYF(MY_NABP)) ||
mysql_file_write(file, (const uchar*)create_info->connect_string.str,
create_info->connect_string.length, MYF(MY_NABP)))
goto err;
int2store(buff, str_db_type.length);
if (mysql_file_write(file, (const uchar*)buff, 2, MYF(MY_NABP)) ||
mysql_file_write(file, (const uchar*)str_db_type.str,
str_db_type.length, MYF(MY_NABP)))
goto err;
#ifdef WITH_PARTITION_STORAGE_ENGINE
if (part_info)
{
char auto_partitioned= part_info->is_auto_partitioned ? 1 : 0;
int4store(buff, part_info->part_info_len);
if (mysql_file_write(file, (const uchar*)buff, 4, MYF_RW) ||
mysql_file_write(file, (const uchar*)part_info->part_info_string,
part_info->part_info_len + 1, MYF_RW) ||
mysql_file_write(file, (const uchar*)&auto_partitioned, 1, MYF_RW))
goto err;
}
else
#endif
{
bzero((uchar*) buff, 6);
if (mysql_file_write(file, (uchar*) buff, 6, MYF_RW))
goto err;
}
for (i= 0; i < keys; i++)
{
if (key_info[i].parser_name)
{
if (mysql_file_write(file, (const uchar*)key_info[i].parser_name->str,
key_info[i].parser_name->length + 1, MYF(MY_NABP)))
goto err;
}
}
if (forminfo[46] == (uchar)255)
{
uchar comment_length_buff[2];
int2store(comment_length_buff,create_info->comment.length);
if (mysql_file_write(file, comment_length_buff, 2, MYF(MY_NABP)) ||
mysql_file_write(file, (uchar*) create_info->comment.str,
create_info->comment.length, MYF(MY_NABP)))
goto err;
}
mysql_file_seek(file, filepos, MY_SEEK_SET, MYF(0));
if (mysql_file_write(file, forminfo, 288, MYF_RW) ||
mysql_file_write(file, screen_buff, info_length, MYF_RW) ||
pack_fields(file, create_fields, data_offset))
goto err;
#ifdef HAVE_CRYPTED_FRM
if (create_info->password)
{
char tmp=2,*disk_buff=0;
SQL_CRYPT *crypted=new SQL_CRYPT(create_info->password);
if (!crypted || mysql_file_pwrite(file, &tmp, 1, 26, MYF_RW))// Mark crypted
goto err;
uint read_length=uint2korr(forminfo)-256;
mysql_file_seek(file, filepos+256, MY_SEEK_SET, MYF(0));
if (read_string(file,(uchar**) &disk_buff,read_length))
goto err;
crypted->encode(disk_buff,read_length);
delete crypted;
if (mysql_file_pwrite(file, disk_buff, read_length, filepos+256, MYF_RW))
{
my_free(disk_buff);
goto err;
}
my_free(disk_buff);
}
#endif
my_free(screen_buff);
my_free(keybuff);
if (opt_sync_frm && !(create_info->options & HA_LEX_CREATE_TMP_TABLE) &&
(mysql_file_sync(file, MYF(MY_WME)) ||
my_sync_dir_by_file(file_name, MYF(MY_WME))))
goto err2;
if (mysql_file_close(file, MYF(MY_WME)))
goto err3;
{
/*
Restore all UCS2 intervals.
HEX representation of them is not needed anymore.
*/
List_iterator<Create_field> it(create_fields);
Create_field *field;
while ((field=it++))
{
if (field->save_interval)
{
field->interval= field->save_interval;
field->save_interval= 0;
}
}
}
DBUG_RETURN(0);
err:
my_free(screen_buff);
my_free(keybuff);
err2:
(void) mysql_file_close(file, MYF(MY_WME));
err3:
mysql_file_delete(key_file_frm, file_name, MYF(0));
DBUG_RETURN(1);
} /* mysql_create_frm */
/*
Create a frm (table definition) file and the tables
SYNOPSIS
rea_create_table()
thd Thread handler
path Name of file (including database, without .frm)
db Data base name
table_name Table name
create_info create info parameters
create_fields Fields to create
keys number of keys to create
key_info Keys to create
file Handler to use
RETURN
0 ok
1 error
*/
int rea_create_table(THD *thd, const char *path,
const char *db, const char *table_name,
HA_CREATE_INFO *create_info,
List<Create_field> &create_fields,
uint keys, KEY *key_info, handler *file)
{
DBUG_ENTER("rea_create_table");
char frm_name[FN_REFLEN];
strxmov(frm_name, path, reg_ext, NullS);
if (mysql_create_frm(thd, frm_name, db, table_name, create_info,
create_fields, keys, key_info, file))
DBUG_RETURN(1);
// Make sure mysql_create_frm din't remove extension
DBUG_ASSERT(*fn_rext(frm_name));
if (thd->variables.keep_files_on_create)
create_info->options|= HA_CREATE_KEEP_FILES;
if (!create_info->frm_only &&
(file->ha_create_handler_files(path, NULL, CHF_CREATE_FLAG,
create_info) ||
ha_create_table(thd, path, db, table_name, create_info, 0)))
goto err_handler;
DBUG_RETURN(0);
err_handler:
(void) file->ha_create_handler_files(path, NULL, CHF_DELETE_FLAG, create_info);
mysql_file_delete(key_file_frm, frm_name, MYF(0));
DBUG_RETURN(1);
} /* rea_create_table */
/* Pack screens to a screen for save in a form-file */
static uchar *pack_screens(List<Create_field> &create_fields,
uint *info_length, uint *screens,
bool small_file)
{
reg1 uint i;
uint row,start_row,end_row,fields_on_screen;
uint length,cols;
uchar *info,*pos,*start_screen;
uint fields=create_fields.elements;
List_iterator<Create_field> it(create_fields);
DBUG_ENTER("pack_screens");
start_row=4; end_row=22; cols=80; fields_on_screen=end_row+1-start_row;
*screens=(fields-1)/fields_on_screen+1;
length= (*screens) * (SC_INFO_LENGTH+ (cols>> 1)+4);
Create_field *field;
while ((field=it++))
length+=(uint) strlen(field->field_name)+1+TE_INFO_LENGTH+cols/2;
if (!(info=(uchar*) my_malloc(length,MYF(MY_WME))))
DBUG_RETURN(0);
start_screen=0;
row=end_row;
pos=info;
it.rewind();
for (i=0 ; i < fields ; i++)
{
Create_field *cfield=it++;
if (row++ == end_row)
{
if (i)
{
length=(uint) (pos-start_screen);
int2store(start_screen,length);
start_screen[2]=(uchar) (fields_on_screen+1);
start_screen[3]=(uchar) (fields_on_screen);
}
row=start_row;
start_screen=pos;
pos+=4;
pos[0]= (uchar) start_row-2; /* Header string */
pos[1]= (uchar) (cols >> 2);
pos[2]= (uchar) (cols >> 1) +1;
strfill((char *) pos+3,(uint) (cols >> 1),' ');
pos+=(cols >> 1)+4;
}
length=(uint) strlen(cfield->field_name);
if (length > cols-3)
length=cols-3;
if (!small_file)
{
pos[0]=(uchar) row;
pos[1]=0;
pos[2]=(uchar) (length+1);
pos=(uchar*) strmake((char*) pos+3,cfield->field_name,length)+1;
}
cfield->row=(uint8) row;
cfield->col=(uint8) (length+1);
cfield->sc_length=(uint8) min(cfield->length,cols-(length+2));
}
length=(uint) (pos-start_screen);
int2store(start_screen,length);
start_screen[2]=(uchar) (row-start_row+2);
start_screen[3]=(uchar) (row-start_row+1);
*info_length=(uint) (pos-info);
DBUG_RETURN(info);
} /* pack_screens */
/* Pack keyinfo and keynames to keybuff for save in form-file. */
static uint pack_keys(uchar *keybuff, uint key_count, KEY *keyinfo,
ulong data_offset)
{
uint key_parts,length;
uchar *pos, *keyname_pos;
KEY *key,*end;
KEY_PART_INFO *key_part,*key_part_end;
DBUG_ENTER("pack_keys");
pos=keybuff+6;
key_parts=0;
for (key=keyinfo,end=keyinfo+key_count ; key != end ; key++)
{
int2store(pos, (key->flags ^ HA_NOSAME));
int2store(pos+2,key->key_length);
pos[4]= (uchar) key->key_parts;
pos[5]= (uchar) key->algorithm;
int2store(pos+6, key->block_size);
pos+=8;
key_parts+=key->key_parts;
DBUG_PRINT("loop", ("flags: %lu key_parts: %d at 0x%lx",
key->flags, key->key_parts,
(long) key->key_part));
for (key_part=key->key_part,key_part_end=key_part+key->key_parts ;
key_part != key_part_end ;
key_part++)
{
uint offset;
DBUG_PRINT("loop",("field: %d startpos: %lu length: %d",
key_part->fieldnr, key_part->offset + data_offset,
key_part->length));
int2store(pos,key_part->fieldnr+1+FIELD_NAME_USED);
offset= (uint) (key_part->offset+data_offset+1);
int2store(pos+2, offset);
pos[4]=0; // Sort order
int2store(pos+5,key_part->key_type);
int2store(pos+7,key_part->length);
pos+=9;
}
}
/* Save keynames */
keyname_pos=pos;
*pos++=(uchar) NAMES_SEP_CHAR;
for (key=keyinfo ; key != end ; key++)
{
uchar *tmp=(uchar*) strmov((char*) pos,key->name);
*tmp++= (uchar) NAMES_SEP_CHAR;
*tmp=0;
pos=tmp;
}
*(pos++)=0;
for (key=keyinfo,end=keyinfo+key_count ; key != end ; key++)
{
if (key->flags & HA_USES_COMMENT)
{
int2store(pos, key->comment.length);
uchar *tmp= (uchar*)strnmov((char*) pos+2,key->comment.str,
key->comment.length);
pos= tmp;
}
}
if (key_count > 127 || key_parts > 127)
{
keybuff[0]= (key_count & 0x7f) | 0x80;
keybuff[1]= key_count >> 7;
int2store(keybuff+2,key_parts);
}
else
{
keybuff[0]=(uchar) key_count;
keybuff[1]=(uchar) key_parts;
keybuff[2]= keybuff[3]= 0;
}
length=(uint) (pos-keyname_pos);
int2store(keybuff+4,length);
DBUG_RETURN((uint) (pos-keybuff));
} /* pack_keys */
/* Make formheader */
static bool pack_header(uchar *forminfo, enum legacy_db_type table_type,
List<Create_field> &create_fields,
uint info_length, uint screens, uint table_options,
ulong data_offset, handler *file)
{
uint length,int_count,int_length,no_empty, int_parts;
uint time_stamp_pos,null_fields;
ulong reclength, totlength, n_length, com_length;
DBUG_ENTER("pack_header");
if (create_fields.elements > MAX_FIELDS)
{
my_message(ER_TOO_MANY_FIELDS, ER(ER_TOO_MANY_FIELDS), MYF(0));
DBUG_RETURN(1);
}
totlength= 0L;
reclength= data_offset;
no_empty=int_count=int_parts=int_length=time_stamp_pos=null_fields=
com_length=0;
n_length=2L;
/* Check fields */
List_iterator<Create_field> it(create_fields);
Create_field *field;
while ((field=it++))
{
uint tmp_len= system_charset_info->cset->charpos(system_charset_info,
field->comment.str,
field->comment.str +
field->comment.length,
COLUMN_COMMENT_MAXLEN);
if (tmp_len < field->comment.length)
{
if ((current_thd->variables.sql_mode &
(MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES)))
{
my_error(ER_TOO_LONG_FIELD_COMMENT, MYF(0),
field->field_name, (uint) COLUMN_COMMENT_MAXLEN);
DBUG_RETURN(1);
}
char warn_buff[MYSQL_ERRMSG_SIZE];
my_snprintf(warn_buff, sizeof(warn_buff), ER(ER_TOO_LONG_FIELD_COMMENT),
field->field_name, (uint) COLUMN_COMMENT_MAXLEN);
/* do not push duplicate warnings */
if (!check_duplicate_warning(current_thd, warn_buff, strlen(warn_buff)))
push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_TOO_LONG_FIELD_COMMENT, warn_buff);
field->comment.length= tmp_len;
}
totlength+= field->length;
com_length+= field->comment.length;
if (MTYP_TYPENR(field->unireg_check) == Field::NOEMPTY ||
field->unireg_check & MTYP_NOEMPTY_BIT)
{
field->unireg_check= (Field::utype) ((uint) field->unireg_check |
MTYP_NOEMPTY_BIT);
no_empty++;
}
/*
We mark first TIMESTAMP field with NOW() in DEFAULT or ON UPDATE
as auto-update field.
*/
if (field->sql_type == MYSQL_TYPE_TIMESTAMP &&
MTYP_TYPENR(field->unireg_check) != Field::NONE &&
!time_stamp_pos)
time_stamp_pos= (uint) field->offset+ (uint) data_offset + 1;
length=field->pack_length;
/* Ensure we don't have any bugs when generating offsets */
DBUG_ASSERT(reclength == field->offset + data_offset);
if ((uint) field->offset+ (uint) data_offset+ length > reclength)
reclength=(uint) (field->offset+ data_offset + length);
n_length+= (ulong) strlen(field->field_name)+1;
field->interval_id=0;
field->save_interval= 0;
if (field->interval)
{
uint old_int_count=int_count;
if (field->charset->mbminlen > 1)
{
/*
Escape UCS2 intervals using HEX notation to avoid
problems with delimiters between enum elements.
As the original representation is still needed in
the function make_empty_rec to create a record of
filled with default values it is saved in save_interval
The HEX representation is created from this copy.
*/
field->save_interval= field->interval;
field->interval= (TYPELIB*) sql_alloc(sizeof(TYPELIB));
*field->interval= *field->save_interval;
field->interval->type_names=
(const char **) sql_alloc(sizeof(char*) *
(field->interval->count+1));
field->interval->type_names[field->interval->count]= 0;
field->interval->type_lengths=
(uint *) sql_alloc(sizeof(uint) * field->interval->count);
for (uint pos= 0; pos < field->interval->count; pos++)
{
char *dst;
const char *src= field->save_interval->type_names[pos];
uint hex_length;
length= field->save_interval->type_lengths[pos];
hex_length= length * 2;
field->interval->type_lengths[pos]= hex_length;
field->interval->type_names[pos]= dst= (char*) sql_alloc(hex_length +
1);
octet2hex(dst, src, length);
}
}
field->interval_id=get_interval_id(&int_count,create_fields,field);
if (old_int_count != int_count)
{
for (const char **pos=field->interval->type_names ; *pos ; pos++)
int_length+=(uint) strlen(*pos)+1; // field + suffix prefix
int_parts+=field->interval->count+1;
}
}
if (f_maybe_null(field->pack_flag))
null_fields++;
}
int_length+=int_count*2; // 255 prefix + 0 suffix
/* Save values in forminfo */
if (reclength > (ulong) file->max_record_length())
{
my_error(ER_TOO_BIG_ROWSIZE, MYF(0), (uint) file->max_record_length());
DBUG_RETURN(1);
}
/* Hack to avoid bugs with small static rows in MySQL */
reclength=max(file->min_record_length(table_options),reclength);
if (info_length+(ulong) create_fields.elements*FCOMP+288+
n_length+int_length+com_length > 65535L || int_count > 255)
{
my_message(ER_TOO_MANY_FIELDS, ER(ER_TOO_MANY_FIELDS), MYF(0));
DBUG_RETURN(1);
}
bzero((char*)forminfo,288);
length=(info_length+create_fields.elements*FCOMP+288+n_length+int_length+
com_length);
int2store(forminfo,length);
forminfo[256] = (uint8) screens;
int2store(forminfo+258,create_fields.elements);
int2store(forminfo+260,info_length);
int2store(forminfo+262,totlength);
int2store(forminfo+264,no_empty);
int2store(forminfo+266,reclength);
int2store(forminfo+268,n_length);
int2store(forminfo+270,int_count);
int2store(forminfo+272,int_parts);
int2store(forminfo+274,int_length);
int2store(forminfo+276,time_stamp_pos);
int2store(forminfo+278,80); /* Columns needed */
int2store(forminfo+280,22); /* Rows needed */
int2store(forminfo+282,null_fields);
int2store(forminfo+284,com_length);
/* Up to forminfo+288 is free to use for additional information */
DBUG_RETURN(0);
} /* pack_header */
/* get each unique interval each own id */
static uint get_interval_id(uint *int_count,List<Create_field> &create_fields,
Create_field *last_field)
{
List_iterator<Create_field> it(create_fields);
Create_field *field;
TYPELIB *interval=last_field->interval;
while ((field=it++) != last_field)
{
if (field->interval_id && field->interval->count == interval->count)
{
const char **a,**b;
for (a=field->interval->type_names, b=interval->type_names ;
*a && !strcmp(*a,*b);
a++,b++) ;
if (! *a)
{
return field->interval_id; // Re-use last interval
}
}
}
return ++*int_count; // New unique interval
}
/* Save fields, fieldnames and intervals */
static bool pack_fields(File file, List<Create_field> &create_fields,
ulong data_offset)
{
reg2 uint i;
uint int_count, comment_length=0;
uchar buff[MAX_FIELD_WIDTH];
Create_field *field;
DBUG_ENTER("pack_fields");
/* Write field info */
List_iterator<Create_field> it(create_fields);
int_count=0;
while ((field=it++))
{
uint recpos;
buff[0]= (uchar) field->row;
buff[1]= (uchar) field->col;
buff[2]= (uchar) field->sc_length;
int2store(buff+3, field->length);
/* The +1 is here becasue the col offset in .frm file have offset 1 */
recpos= field->offset+1 + (uint) data_offset;
int3store(buff+5,recpos);
int2store(buff+8,field->pack_flag);
DBUG_ASSERT(field->unireg_check < 256);
buff[10]= (uchar) field->unireg_check;
buff[12]= (uchar) field->interval_id;
buff[13]= (uchar) field->sql_type;
if (field->sql_type == MYSQL_TYPE_GEOMETRY)
{
buff[11]= 0;
buff[14]= (uchar) field->geom_type;
#ifndef HAVE_SPATIAL
DBUG_ASSERT(0); // Should newer happen
#endif
}
else if (field->charset)
{
buff[11]= (uchar) (field->charset->number >> 8);
buff[14]= (uchar) field->charset->number;
}
else
{
buff[11]= buff[14]= 0; // Numerical
}
int2store(buff+15, field->comment.length);
comment_length+= field->comment.length;
set_if_bigger(int_count,field->interval_id);
if (mysql_file_write(file, buff, FCOMP, MYF_RW))
DBUG_RETURN(1);
}
/* Write fieldnames */
buff[0]=(uchar) NAMES_SEP_CHAR;
if (mysql_file_write(file, buff, 1, MYF_RW))
DBUG_RETURN(1);
i=0;
it.rewind();
while ((field=it++))
{
char *pos= strmov((char*) buff,field->field_name);
*pos++=NAMES_SEP_CHAR;
if (i == create_fields.elements-1)
*pos++=0;
if (mysql_file_write(file, buff, (size_t) (pos-(char*) buff), MYF_RW))
DBUG_RETURN(1);
i++;
}
/* Write intervals */
if (int_count)
{
String tmp((char*) buff,sizeof(buff), &my_charset_bin);
tmp.length(0);
it.rewind();
int_count=0;
while ((field=it++))
{
if (field->interval_id > int_count)
{
unsigned char sep= 0;
unsigned char occ[256];
uint i;
unsigned char *val= NULL;
bzero(occ, sizeof(occ));
for (i=0; (val= (unsigned char*) field->interval->type_names[i]); i++)
for (uint j = 0; j < field->interval->type_lengths[i]; j++)
occ[(unsigned int) (val[j])]= 1;
if (!occ[(unsigned char)NAMES_SEP_CHAR])
sep= (unsigned char) NAMES_SEP_CHAR;
else if (!occ[(unsigned int)','])
sep= ',';
else
{
for (uint i=1; i<256; i++)
{
if(!occ[i])
{
sep= i;
break;
}
}
if(!sep) /* disaster, enum uses all characters, none left as separator */
{
my_message(ER_WRONG_FIELD_TERMINATORS,ER(ER_WRONG_FIELD_TERMINATORS),
MYF(0));
DBUG_RETURN(1);
}
}
int_count= field->interval_id;
tmp.append(sep);
for (const char **pos=field->interval->type_names ; *pos ; pos++)
{
tmp.append(*pos);
tmp.append(sep);
}
tmp.append('\0'); // End of intervall
}
}
if (mysql_file_write(file, (uchar*) tmp.ptr(), tmp.length(), MYF_RW))
DBUG_RETURN(1);
}
if (comment_length)
{
it.rewind();
int_count=0;
while ((field=it++))
{
if (field->comment.length)
if (mysql_file_write(file, (uchar*) field->comment.str,
field->comment.length, MYF_RW))
DBUG_RETURN(1);
}
}
DBUG_RETURN(0);
}
/* save an empty record on start of formfile */
static bool make_empty_rec(THD *thd, File file,enum legacy_db_type table_type,
uint table_options,
List<Create_field> &create_fields,
uint reclength,
ulong data_offset,
handler *handler)
{
int error= 0;
Field::utype type;
uint null_count;
uchar *buff,*null_pos;
TABLE table;
TABLE_SHARE share;
Create_field *field;
enum_check_fields old_count_cuted_fields= thd->count_cuted_fields;
DBUG_ENTER("make_empty_rec");
/* We need a table to generate columns for default values */
bzero((char*) &table, sizeof(table));
bzero((char*) &share, sizeof(share));
table.s= &share;
if (!(buff=(uchar*) my_malloc((size_t) reclength,MYF(MY_WME | MY_ZEROFILL))))
{
DBUG_RETURN(1);
}
table.in_use= thd;
table.s->db_low_byte_first= handler->low_byte_first();
table.s->blob_ptr_size= portable_sizeof_char_ptr;
null_count=0;
if (!(table_options & HA_OPTION_PACK_RECORD))
{
null_count++; // Need one bit for delete mark
*buff|= 1;
}
null_pos= buff;
List_iterator<Create_field> it(create_fields);
thd->count_cuted_fields= CHECK_FIELD_WARN; // To find wrong default values
while ((field=it++))
{
/*
regfield don't have to be deleted as it's allocated with sql_alloc()
*/
Field *regfield= make_field(&share,
buff+field->offset + data_offset,
field->length,
null_pos + null_count / 8,
null_count & 7,
field->pack_flag,
field->sql_type,
field->charset,
field->geom_type,
field->unireg_check,
field->save_interval ? field->save_interval :
field->interval,
field->field_name);
if (!regfield)
{
error= 1;
goto err; // End of memory
}
/* save_in_field() will access regfield->table->in_use */
regfield->init(&table);
if (!(field->flags & NOT_NULL_FLAG))
{
*regfield->null_ptr|= regfield->null_bit;
null_count++;
}
if (field->sql_type == MYSQL_TYPE_BIT && !f_bit_as_char(field->pack_flag))
null_count+= field->length & 7;
type= (Field::utype) MTYP_TYPENR(field->unireg_check);
if (field->def)
{
int res= field->def->save_in_field(regfield, 1);
/* If not ok or warning of level 'note' */
if (res != 0 && res != 3)
{
my_error(ER_INVALID_DEFAULT, MYF(0), regfield->field_name);
error= 1;
delete regfield; //To avoid memory leak
goto err;
}
}
else if (regfield->real_type() == MYSQL_TYPE_ENUM &&
(field->flags & NOT_NULL_FLAG))
{
regfield->set_notnull();
regfield->store((longlong) 1, TRUE);
}
else if (type == Field::YES) // Old unireg type
regfield->store(ER(ER_YES),(uint) strlen(ER(ER_YES)),system_charset_info);
else if (type == Field::NO) // Old unireg type
regfield->store(ER(ER_NO), (uint) strlen(ER(ER_NO)),system_charset_info);
else
regfield->reset();
}
DBUG_ASSERT(data_offset == ((null_count + 7) / 8));
/*
We need to set the unused bits to 1. If the number of bits is a multiple
of 8 there are no unused bits.
*/
if (null_count & 7)
*(null_pos + null_count / 8)|= ~(((uchar) 1 << (null_count & 7)) - 1);
error= mysql_file_write(file, buff, (size_t) reclength, MYF_RW) != 0;
err:
my_free(buff);
thd->count_cuted_fields= old_count_cuted_fields;
DBUG_RETURN(error);
} /* make_empty_rec */
Reference in a new issue View git blame Copy permalink