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mariadb/strings/ctype-uca1400.h
Alexander Barkov 10c063f9f0 MDEV-36213 Doubled memory usage (11.4.4 <-> 11.4.5) 
Fixing the code adding MySQL _0900_ collations as _uca1400_ aliases
not to perform deep initialization of the corresponding _uca1400_
collations.

Only basic initialization is now performed which allows to watch
these collations (both _0900_ and _uca1400_) in queries to
INFORMATION_SCHEMA tables COLLATIONS and
COLLATION_CHARACTER_SET_APPLICABILITY,
as well as in SHOW COLLATION statements.

Deep initialization is now performed only when a collation
(either the _0900_ alias or the corresponding  _uca1400_ collation)
is used for the very first time after the server startup.

Refactoring was done to maintain the code easier:
- most of the _uca1400_ code was moved from ctype-uca.c
  to a new file ctype-uca1400.c
- most of the _0900_ code was moved from type-uca.c
  to a new file ctype-uca0900.c

Change details:

- The original function add_alias_for_collation() added by the patch for
   "MDEV-20912 Add support for utf8mb4_0900_* collations in MariaDB Server"
  was removed from mysys/charset.c, as it had two two problems:

  a. it forced deep initialization of the _uca1400_ collations
     when adding _0900_ aliases for them at the server startup
     (the main reported problem)

  b. the collation initialization code in add_alias_for_collation()
     was related more to collations rather than to memory management,
     so /strings should be a better place for it than /mysys.

  The code from add_alias_for_collation() was split into separate functions.
  Cyclic dependency was removed. `#include <my_sys.h>` was removed
  from /strings/ctype-uca.c. Collations are now added using a callback
  function MY_CHARSET_LOADED::add_collation, like it is done for
  user collations defined in Index.xml. The code in /mysys sets
  MY_CHARSET_LOADED::add_collation to add_compiled_collation().

- The function compare_collations() was removed.
  A new virtual function was added into my_collation_handler_st instead:

    my_bool (*eq_collation)(CHARSET_INFO *self, CHARSET_INFO *other);

  because it is the collation handler who knows how to detect equal
  collations by comparing only some of CHARSET_INFO members without
  their deep initialization.

  Three implementations were added:
  - my_ci_eq_collation_uca() for UCA collations, it compares
    _0900_ collations as equal to their corresponding _uca1400_ collations.
  - my_ci_eq_collation_utf8mb4_bin(), it compares
    utf8mb4_nopad_bin and utf8mb4_0900_bin as equal.
  - my_ci_eq_collation_generic() - the default implementation,
    which compares all collations as not equal.

  A C++ wrapper CHARSET_INFO::eq_collations() was added.
  The code in /sql was changes to use the wrapper instead of
  the former calls for the removed function compare_collations().

- A part of add_alias_for_collation() was moved into a new function
  my_ci_alloc(). It allocates a memory for a new charset_info_st
  instance together with the collation name and the comment using a single
  MY_CHARSET_LOADER::once_alloc call, which points to my_once_alloc()
  in the server.

- A part of add_alias_for_collation() was moved into a new function
  my_ci_make_comment_for_alias(). It makes an "Alias for xxx" string,
  e.g. "Alias for utf8mb4_uca1400_swedish_ai_ci" in case of
  utf8mb4_sv_0900_ai_ci.

- A part of the code in create_tailoring() was moved to
  a new function my_uca1400_collation_get_initialized_shared_uca(),
  to reuse the code between _uca1400_ and _0900_ collations.

- A new function my_collation_id_is_mysql_uca0900() was added
  in addition to my_collation_id_is_mysql_uca1400().

- Functions to build collation names were added:
   my_uca0900_collation_build_name()
   my_uca1400_collation_build_name()

- A shared function function was added:

  my_bool
  my_uca1400_collation_alloc_and_init(MY_CHARSET_LOADER *loader,
                                      LEX_CSTRING name,
                                      LEX_CSTRING comment,
                                      const uca_collation_def_param_t *param,
                                      uint id)

  It's reused to add _uca1400_ and _0900_ collations, with basic
  initialization (without deep initialization).

- The function add_compiled_collation() changed its return type from
  void to int, to make it compatible with MY_CHARSET_LOADER::add_collation.

- Functions mysql_uca0900_collation_definition_add(),
  mysql_uca0900_utf8mb4_collation_definitions_add(),
  mysql_utf8mb4_0900_bin_add() were added into ctype-uca0900.c.
  They get MY_CHARSET_LOADER as a parameter.

- Functions my_uca1400_collation_definition_add(),
  my_uca1400_collation_definitions_add() were moved from
  charset-def.c to strings/ctype-uca1400.c.
  The latter now accepts MY_CHARSET_LOADER as the first parameter
  instead of initializing a MY_CHARSET_LOADER inside.

- init_compiled_charsets() now initializes a MY_CHARSET_LOADER
  variable and passes it to all functions adding collations:
  - mysql_utf8mb4_0900_collation_definitions_add()
  - mysql_uca0900_utf8mb4_collation_definitions_add()
  - mysql_utf8mb4_0900_bin_add()

- A new structure was added into ctype-uca.h:

  typedef struct uca_collation_def_param
  {
    my_cs_encoding_t cs_id;
    uint tailoring_id;
    uint nopad_flags;
    uint level_flags;
  } uca_collation_def_param_t;

  It simplifies reusing the code for _uca1400_ and _0900_ collations.

- The definition of MY_UCA1400_COLLATION_DEFINITION was
  moved from ctype-uca.c to ctype-uca1400.h, to reuse
  the code for _uca1400_ and _0900_ collations.

- The definitions of "MY_UCA_INFO my_uca_v1400" and
  "MY_UCA_INFO my_uca1400_info_tailored[][]" were moved from
  ctype-uca.c to ctype-uca1400.c.

- The definitions/declarations of:
  - mysql_0900_collation_start,
  - struct mysql_0900_to_mariadb_1400_mapping
  - mysql_0900_to_mariadb_1400_mapping
  - mysql_utf8mb4_0900_collation_definitions_add()
  were moved from ctype-uca.c to ctype-uca0900.c

- Functions
  my_uca1400_make_builtin_collation_id()
  my_uca1400_collation_definition_init()
  my_uca1400_collation_id_uca400_compat()
  my_ci_get_collation_name_uca1400_context()
  were moved from ctype-uca.c to ctype-uca1400.c and ctype-uca1400.h

- A part of my_uca1400_collation_definition_init()
  was moved into my_uca0520_builtin_collation_by_id(),
  to make functions smaller.
2025-04-17 10:01:53 +04:00

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#ifndef CTYPE_UCA_1400_H
#define CTYPE_UCA_1400_H
/* Copyright (c) 2021, MariaDB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; version 2
of the License.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1335 USA */
/*
17000..187FF; Tangut [6144]
18800..18AFF; Tangut Components [768]
18D00..18D7F; Tangut Supplement [128]
*/
static inline my_bool
my_uca_1400_is_assigned_tangut(my_wc_t code)
{
return (code >= 0x17000 && code <= 0x187FF) ||
(code >= 0x18800 && code <= 0x18AFF) ||
(code >= 0x18D00 && code <= 0x18D7F);
}
static inline MY_UCA_IMPLICIT_WEIGHT
my_uca_1400_implicit_weight_primary_tangut(my_wc_t code)
{
MY_UCA_IMPLICIT_WEIGHT res;
res.weight[0]= 0xFB00;
res.weight[1]= (uint16) (code - 0x17000) | 0x8000;
return res;
}
/*
1B170..1B2FF; Nushu [400]
*/
static inline my_bool
my_uca_1400_is_assigned_nushu(my_wc_t code)
{
return code >= 0x1B170 && code <= 0x1B2FF;
}
static inline MY_UCA_IMPLICIT_WEIGHT
my_uca_1400_implicit_weight_primary_nushu(my_wc_t code)
{
MY_UCA_IMPLICIT_WEIGHT res;
res.weight[0]= 0xFB01;
res.weight[1]= (uint16) (code - 0x1B170) | 0x8000;
return res;
}
/*
18B00..18CFF; Khitan Small Script [512]
*/
static inline my_bool
my_uca_1400_is_assigned_khitan_small_script(my_wc_t code)
{
return code >= 0x18B00 && code <= 0x18CFF;
}
static inline MY_UCA_IMPLICIT_WEIGHT
my_uca_1400_implicit_weight_primary_khitan(my_wc_t code)
{
MY_UCA_IMPLICIT_WEIGHT res;
res.weight[0]= 0xFB02;
res.weight[1]= (uint16) (code - 0x18B00) | 0x8000;
return res;
}
/*
Unified_Ideograph=True AND
((Block=CJK_Unified_Ideograph) OR (Block=CJK_Compatibility_Ideographs))
https://www.unicode.org/Public/14.0.0/ucd/Blocks.txt
4E00..9FFF; CJK Unified Ideographs
F900..FAFF; CJK Compatibility Ideographs
https://www.unicode.org/Public/14.0.0/ucd/PropList.txt
4E00..9FFF ; Unified_Ideograph # Lo [20992] CJK UNIFIED IDEOGRAPH-4E00..CJK UNIFIED IDEOGRAPH-9FFF
FA0E..FA0F ; Unified_Ideograph # Lo [2] CJK COMPATIBILITY IDEOGRAPH-FA0E..CJK COMPATIBILITY IDEOGRAPH-FA0F
FA11 ; Unified_Ideograph # Lo CJK COMPATIBILITY IDEOGRAPH-FA11
FA13..FA14 ; Unified_Ideograph # Lo [2] CJK COMPATIBILITY IDEOGRAPH-FA13..CJK COMPATIBILITY IDEOGRAPH-FA14
FA1F ; Unified_Ideograph # Lo CJK COMPATIBILITY IDEOGRAPH-FA1F
FA21 ; Unified_Ideograph # Lo CJK COMPATIBILITY IDEOGRAPH-FA21
FA23..FA24 ; Unified_Ideograph # Lo [2] CJK COMPATIBILITY IDEOGRAPH-FA23..CJK COMPATIBILITY IDEOGRAPH-FA24
FA27..FA29 ; Unified_Ideograph # Lo [3] CJK COMPATIBILITY IDEOGRAPH-FA27..CJK COMPATIBILITY IDEOGRAPH-FA29
*/
static inline my_bool
my_uca_1400_is_core_han_unified_ideograph(my_wc_t code)
{
return (code >= 0x4E00 && code <= 0x9FFF) ||
(code >= 0xFA0E && code <= 0xFA0F) ||
(code == 0xFA11) ||
(code >= 0xFA13 && code <= 0xFA14) ||
(code == 0xFA1F) ||
(code == 0xFA21) ||
(code >= 0xFA23 && code <= 0xFA24) ||
(code >= 0xFA27 && code <= 0xFA29);
}
/*
(Unified_Ideograph=True AND NOT
((Block=CJK_Unified_Ideograph) OR (Block=CJK_Compatibility_Ideographs))
https://www.unicode.org/Public/14.0.0/ucd/Blocks.txt
3400..4DBF; CJK Unified Ideographs Extension A
20000..2A6DF; CJK Unified Ideographs Extension B
2A700..2B73F; CJK Unified Ideographs Extension C
2B740..2B81F; CJK Unified Ideographs Extension D
2B820..2CEAF; CJK Unified Ideographs Extension E
2CEB0..2EBEF; CJK Unified Ideographs Extension F
30000..3134F; CJK Unified Ideographs Extension G
https://www.unicode.org/Public/14.0.0/ucd/PropList.txt
3400..4DBF ; Unified_Ideograph # Lo [6592] CJK UNIFIED IDEOGRAPH-3400..CJK UNIFIED IDEOGRAPH-4DBF
20000..2A6DF ; Unified_Ideograph # Lo [42720] CJK UNIFIED IDEOGRAPH-20000..CJK UNIFIED IDEOGRAPH-2A6DF
2A700..2B738 ; Unified_Ideograph # Lo [4153] CJK UNIFIED IDEOGRAPH-2A700..CJK UNIFIED IDEOGRAPH-2B738
2B740..2B81D ; Unified_Ideograph # Lo [222] CJK UNIFIED IDEOGRAPH-2B740..CJK UNIFIED IDEOGRAPH-2B81D
2B820..2CEA1 ; Unified_Ideograph # Lo [5762] CJK UNIFIED IDEOGRAPH-2B820..CJK UNIFIED IDEOGRAPH-2CEA1
2CEB0..2EBE0 ; Unified_Ideograph # Lo [7473] CJK UNIFIED IDEOGRAPH-2CEB0..CJK UNIFIED IDEOGRAPH-2EBE0
30000..3134A ; Unified_Ideograph # Lo [4939] CJK UNIFIED IDEOGRAPH-30000..CJK UNIFIED IDEOGRAPH-3134A
*/
static inline my_bool
my_uca_1400_is_other_han_unified_ideograph(my_wc_t code)
{
return (code >= 0x3400 && code <= 0x4DBF) ||
(code >= 0x20000 && code <= 0x2A6DF) ||
(code >= 0x2A700 && code <= 0x2B738) ||
(code >= 0x2B740 && code <= 0x2B81D) ||
(code >= 0x2B820 && code <= 0x2CEA1) ||
(code >= 0x2CEB0 && code <= 0x2EBE0) ||
(code >= 0x30000 && code <= 0x3134A);
}
/*
See section "Computing Implicit Weights" in
https://unicode.org/reports/tr10/#Values_For_Base_Table
*/
static inline MY_UCA_IMPLICIT_WEIGHT
my_uca_1400_implicit_weight_primary(my_wc_t code)
{
if (my_uca_1400_is_core_han_unified_ideograph(code))
return my_uca_implicit_weight_primary_default(0xFB40, code);
if (my_uca_1400_is_other_han_unified_ideograph(code))
return my_uca_implicit_weight_primary_default(0xFB80, code);
if (my_uca_1400_is_assigned_tangut(code))
return my_uca_1400_implicit_weight_primary_tangut(code);
if (my_uca_1400_is_assigned_nushu(code))
return my_uca_1400_implicit_weight_primary_nushu(code);
if (my_uca_1400_is_assigned_khitan_small_script(code))
return my_uca_1400_implicit_weight_primary_khitan(code);
/* Unassigned - Any other code point */
return my_uca_implicit_weight_primary_default(0xFBC0, code);
}
#define MY_UCA1400_COLLATION_ID_POSSIBLE_MIN 2048
#define MY_UCA1400_COLLATION_ID_POSSIBLE_MAX 4095
static inline my_bool
my_collation_id_is_uca1400(uint id)
{
return (my_bool) (id >= MY_UCA1400_COLLATION_ID_POSSIBLE_MIN &&
id <= MY_UCA1400_COLLATION_ID_POSSIBLE_MAX);
}
typedef struct my_uca1400_collation_definition_st
{
const char * tailoring;
const char * name;
uint16 id_utf8mb3;
uint16 id_utf8mb4;
uint16 id_ucs2;
uint16 id_utf16;
uint16 id_utf32;
} MY_UCA1400_COLLATION_DEFINITION;
/*
UCA1400 collation ID:
1000 0000 0000 0x800 2048
1111 1111 1111 0xFFF 4095
1ccc tttt tPST
c - charset ID (utf8mb3=0, utf8mb4=1, ucs2=2, utf16=3, utf32=4)
p - PAD/NO PAD
S - secondary level is enabled
T - tertiary level is enabled
*/
static inline my_cs_encoding_t
my_uca1400_collation_id_to_charset_id(uint id)
{
DBUG_ASSERT(id);
return (my_cs_encoding_t) ((id >> 8) & 0x07);
}
static inline uint
my_uca1400_collation_id_to_tailoring_id(uint id)
{
DBUG_ASSERT(id);
return (id >> 3) & 0x1F;
}
static inline my_bool
my_uca1400_collation_id_to_nopad_flag(uint id)
{
DBUG_ASSERT(id);
return (my_bool) ((id >> 2) & 0x01);
}
static inline my_bool
my_uca1400_collation_id_to_secondary_level_flag(uint id)
{
DBUG_ASSERT(id);
return (my_bool) ((id >> 1) & 0x01);
}
static inline my_bool
my_uca1400_collation_id_to_tertiary_level_flag(uint id)
{
DBUG_ASSERT(id);
return (my_bool) ((id >> 0) & 0x01);
}
static inline uint
my_uca1400_collation_id_to_level_flags(uint id)
{
my_bool secondary_level, tertiary_level;
DBUG_ASSERT(id);
secondary_level= my_uca1400_collation_id_to_secondary_level_flag(id);
tertiary_level= my_uca1400_collation_id_to_tertiary_level_flag(id);
return (1 << MY_CS_LEVEL_BIT_PRIMARY) |
(secondary_level ? 1 << MY_CS_LEVEL_BIT_SECONDARY : 0) |
(tertiary_level ? 1 << MY_CS_LEVEL_BIT_TERTIARY : 0);
}
/*
Return an UCA-14.0.0 collation properties using its ID.
*/
static inline uca_collation_def_param_t
my_uca1400_collation_param_by_id(uint id)
{
uca_collation_def_param_t res;
DBUG_ASSERT(id);
res.cs_id= my_uca1400_collation_id_to_charset_id(id);
res.tailoring_id= my_uca1400_collation_id_to_tailoring_id(id);
res.nopad_flags= my_uca1400_collation_id_to_nopad_flag(id);
res.level_flags= my_uca1400_collation_id_to_level_flags(id);
return res;
}
uint
my_uca1400_make_builtin_collation_id(my_cs_encoding_t charset_id,
uint tailoring_id,
my_bool nopad,
my_bool secondary_level,
my_bool tertiary_level);
LEX_CSTRING
my_uca1400_collation_build_name(char *buffer, size_t buffer_size,
const LEX_CSTRING *cs_name,
const char *tailoring_name,
const uca_collation_def_param_t *prm);
my_bool
my_uca1400_collation_alloc_and_init(MY_CHARSET_LOADER *loader,
LEX_CSTRING name,
LEX_CSTRING comment,
const uca_collation_def_param_t *param,
uint id);
LEX_CSTRING my_ci_get_collation_name_uca1400_context(CHARSET_INFO *cs);
uint my_uca1400_collation_id_uca400_compat(uint id);
my_bool my_uca1400_collation_definitions_add(MY_CHARSET_LOADER *loader);
/* Exported data */
#define MY_UCA1400_COLLATION_DEFINITION_COUNT 26
extern MY_UCA1400_COLLATION_DEFINITION
my_uca1400_collation_definitions[MY_UCA1400_COLLATION_DEFINITION_COUNT];
extern MY_UCA_INFO my_uca_v1400;
extern MY_UCA_INFO my_uca1400_info_tailored[MY_CS_ENCODING_LAST+1]
[MY_UCA1400_COLLATION_DEFINITION_COUNT];
#endif /* CTYPE_UCA_1400_H */
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