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gh-103583: Isolate CJK modules, alternative 1 by erlend-aasland · Pull Request #103868 · python/cpython · GitHub

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gh-103583: Isolate CJK modules, alternative 1 #103868

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gh-103583: Isolate CJK modules, alternative 1 #103868

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24bf1dd
Add codec deinit callback
erlend-aasland Apr 16, 2023
e1713e9
Deinit codecs at cjk module free
erlend-aasland Apr 16, 2023
5b8324d
Proof of concept: put big5 map pointers on heap
erlend-aasland Apr 16, 2023
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38 changes: 29 additions & 9 deletions Modules/cjkcodecs/_codecs_hk.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,16 +13,28 @@
* BIG5HKSCS codec
*/

static const encode_map *big5_encmap = NULL;
static const decode_map *big5_decmap = NULL;
typedef struct {
const encode_map *big5_encmap;
const decode_map *big5_decmap;
int initialized;
} big5_state;

CODEC_INIT(big5hkscs)
{
static int initialized = 0;

if (!initialized && IMPORT_MAP(tw, big5, &big5_encmap, &big5_decmap))
big5_state *st = (big5_state *)config;
if (st->initialized) {
return 0;
}
if (IMPORT_MAP(tw, big5, &st->big5_encmap, &st->big5_decmap)) {
return -1;
initialized = 1;
}
st->initialized = 1;
return 0;
}

CODEC_DEINIT(big5hkscs)
{
PyMem_Free((void *)config);
return 0;
}

Expand Down Expand Up @@ -53,6 +65,7 @@ ENCODER(big5hkscs)
insize = 1;
REQUIRE_OUTBUF(2);

big5_state *st = (big5_state *)config;
if (c < 0x10000) {
if (TRYMAP_ENC(big5hkscs_bmp, code, c)) {
if (code == MULTIC) {
Expand Down Expand Up @@ -81,7 +94,7 @@ ENCODER(big5hkscs)
}
}
}
else if (TRYMAP_ENC(big5, code, c))
else if (TRYMAP_ENC_PTR(st->big5_encmap, code, c))
;
else
return 1;
Expand Down Expand Up @@ -122,7 +135,8 @@ DECODER(big5hkscs)
REQUIRE_INBUF(2);

if (0xc6 > c || c > 0xc8 || (c < 0xc7 && INBYTE2 < 0xa1)) {
if (TRYMAP_DEC(big5, decoded, c, INBYTE2)) {
big5_state *st = (big5_state *)config;
if (TRYMAP_DEC_PTR(st->big5_decmap, decoded, c, INBYTE2)) {
OUTCHAR(decoded);
NEXT_IN(2);
continue;
Expand Down Expand Up @@ -184,7 +198,13 @@ BEGIN_MAPPINGS_LIST(3)
END_MAPPINGS_LIST

BEGIN_CODECS_LIST(1)
CODEC_STATELESS_WINIT(big5hkscs)
{
big5_state *config = PyMem_Calloc(1, sizeof(big5_state));
if (config == NULL) {
return -1;
}
CODEC_STATELESS_WINIT(big5hkscs, config)
}
END_CODECS_LIST

I_AM_A_MODULE_FOR(hk)
1 change: 1 addition & 0 deletions Modules/cjkcodecs/_codecs_iso2022.c
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Expand Up @@ -1128,6 +1128,7 @@ NEXT_CODEC = (MultibyteCodec){ \
"iso2022_" #variation, \
&iso2022_##variation##_config, \
iso2022_codec_init, \
NULL, \
_STATEFUL_METHODS(iso2022) \
};

Expand Down
2 changes: 1 addition & 1 deletion Modules/cjkcodecs/_codecs_jp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -748,7 +748,7 @@ BEGIN_MAPPINGS_LIST(11)
END_MAPPINGS_LIST

#define CODEC_CUSTOM(NAME, N, METH) \
NEXT_CODEC = (MultibyteCodec){NAME, (void *)N, NULL, _STATELESS_METHODS(METH)};
NEXT_CODEC = (MultibyteCodec){NAME, (void *)N, NULL, NULL, _STATELESS_METHODS(METH)};

BEGIN_CODECS_LIST(7)
CODEC_STATELESS(shift_jis)
Expand Down
37 changes: 33 additions & 4 deletions Modules/cjkcodecs/cjkcodecs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,9 @@ get_module_state(PyObject *mod)
#define CODEC_INIT(encoding) \
static int encoding##_codec_init(const void *config)

#define CODEC_DEINIT(encoding) \
static int encoding##_codec_deinit(const void *config)

#define ENCODER_INIT(encoding) \
static int encoding##_encode_init( \
MultibyteCodec_State *state, const void *config)
Expand Down Expand Up @@ -205,6 +208,8 @@ get_module_state(PyObject *mod)
(m)->bottom]) != NOCHAR)
#define TRYMAP_ENC(charset, assi, uni) \
_TRYMAP_ENC(&charset##_encmap[(uni) >> 8], assi, (uni) & 0xff)
#define TRYMAP_ENC_PTR(map, assi, uni) \
_TRYMAP_ENC(&(map)[(uni) >> 8], assi, (uni) & 0xff)

#define _TRYMAP_DEC(m, assi, val) \
((m)->map != NULL && \
Expand All @@ -213,6 +218,8 @@ get_module_state(PyObject *mod)
((assi) = (m)->map[(val) - (m)->bottom]) != UNIINV)
#define TRYMAP_DEC(charset, assi, c1, c2) \
_TRYMAP_DEC(&charset##_decmap[c1], assi, c2)
#define TRYMAP_DEC_PTR(map, assi, c1, c2) \
_TRYMAP_DEC(&(map)[c1], assi, c2)

#define BEGIN_MAPPINGS_LIST(NUM) \
static int \
Expand Down Expand Up @@ -265,11 +272,15 @@ add_codecs(cjkcodecs_module_state *st) \
st->codec_list[idx++]

#define CODEC_STATEFUL(enc) \
NEXT_CODEC = (MultibyteCodec){#enc, NULL, NULL, _STATEFUL_METHODS(enc)};
NEXT_CODEC = (MultibyteCodec){#enc, NULL, NULL, NULL, \
_STATEFUL_METHODS(enc)};
#define CODEC_STATELESS(enc) \
NEXT_CODEC = (MultibyteCodec){#enc, NULL, NULL, _STATELESS_METHODS(enc)};
#define CODEC_STATELESS_WINIT(enc) \
NEXT_CODEC = (MultibyteCodec){#enc, NULL, enc##_codec_init, _STATELESS_METHODS(enc)};
NEXT_CODEC = (MultibyteCodec){#enc, NULL, NULL, NULL, \
_STATELESS_METHODS(enc)};
#define CODEC_STATELESS_WINIT(enc, config) \
NEXT_CODEC = (MultibyteCodec){#enc, config, \
enc##_codec_init, enc##_codec_deinit, \
_STATELESS_METHODS(enc)};

#define END_CODECS_LIST \
assert(st->num_codecs == idx); \
Expand Down Expand Up @@ -467,6 +478,22 @@ importmap(const char *modname, const char *symbol,
}
#endif

static struct PyModuleDef _cjk_module;

static void
deinit_codecs(PyObject *mod)
{
cjkcodecs_module_state *st = get_module_state(mod);
for (int i = 0; i < st->num_codecs; i++) {
const MultibyteCodec *codec = &st->codec_list[i];
if (codec && codec->codecdeinit) {
if (codec->codecdeinit(codec->config) < 0) {
PyErr_WriteUnraisable(mod);
}
}
}
}

static int
_cjk_exec(PyObject *module)
{
Expand All @@ -476,6 +503,8 @@ _cjk_exec(PyObject *module)
static void
_cjk_free(void *mod)
{
deinit_codecs(mod);

cjkcodecs_module_state *st = get_module_state((PyObject *)mod);
PyMem_Free(st->mapping_list);
PyMem_Free(st->codec_list);
Expand Down
2 changes: 2 additions & 0 deletions Modules/cjkcodecs/multibytecodec.h
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Expand Up @@ -28,6 +28,7 @@ typedef struct {
} MultibyteCodec_State;

typedef int (*mbcodec_init)(const void *config);
typedef int (*mbcodec_deinit)(const void *config);
typedef Py_ssize_t (*mbencode_func)(MultibyteCodec_State *state,
const void *config,
int kind, const void *data,
Expand All @@ -52,6 +53,7 @@ typedef struct {
const char *encoding;
const void *config;
mbcodec_init codecinit;
mbcodec_init codecdeinit;
mbencode_func encode;
mbencodeinit_func encinit;
mbencodereset_func encreset;
Expand Down
3 changes: 0 additions & 3 deletions Tools/c-analyzer/cpython/globals-to-fix.tsv
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Original file line number Diff line number Diff line change
Expand Up @@ -485,9 +485,6 @@ Modules/_decimal/_decimal.c - _py_float_abs -
Modules/_decimal/_decimal.c - _py_long_bit_length -
Modules/_decimal/_decimal.c - _py_float_as_integer_ratio -
Modules/_elementtree.c - expat_capi -
Modules/cjkcodecs/_codecs_hk.c - big5_encmap -
Modules/cjkcodecs/_codecs_hk.c - big5_decmap -
Modules/cjkcodecs/_codecs_hk.c big5hkscs_codec_init initialized -
Modules/cjkcodecs/_codecs_iso2022.c - cp949_encmap -
Modules/cjkcodecs/_codecs_iso2022.c - ksx1001_decmap -
Modules/cjkcodecs/_codecs_iso2022.c - jisxcommon_encmap -
Expand Down
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