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Issue #10156: In the interpreter's initialization phase, unicode globals 

are now initialized dynamically as needed.
This commit is contained in:
Serhiy Storchaka 2013-01-26 12:18:17 +02:00
parent dd399af438 678db84b37
commit ed3c4128c0
2 changed files with 86 additions and 110 deletions
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3
Misc/NEWS
View File

@ -10,6 +10,9 @@ What's New in Python 3.4.0 Alpha 1?
Core and Builtins
-----------------
- Issue #10156: In the interpreter's initialization phase, unicode globals
are now initialized dynamically as needed.
- Issue #16980: Fix processing of escaped non-ascii bytes in the
unicode-escape-decode decoder.

193
Objects/unicodeobject.c
View File

@ -49,8 +49,9 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/* --- Globals ------------------------------------------------------------
The globals are initialized by the _PyUnicode_Init() API and should
not be used before calling that API.
NOTE: In the interpreter's initialization phase, some globals are currently
initialized dynamically as needed. In the process Unicode objects may
be created before the Unicode type is ready.
*/
@ -171,17 +172,36 @@ extern "C" {
Another way to look at this is that to say that the actual reference
count of a string is: s->ob_refcnt + (s->state ? 2 : 0)
*/
static PyObject *interned;
static PyObject *interned = NULL;
/* The empty Unicode object is shared to improve performance. */
static PyObject *unicode_empty;
static PyObject *unicode_empty = NULL;
#define _Py_INCREF_UNICODE_EMPTY() \
do { \
if (unicode_empty != NULL) \
Py_INCREF(unicode_empty); \
else { \
unicode_empty = PyUnicode_New(0, 0); \
if (unicode_empty != NULL) { \
Py_INCREF(unicode_empty); \
assert(_PyUnicode_CheckConsistency(unicode_empty, 1)); \
} \
} \
} while (0)
#define _Py_RETURN_UNICODE_EMPTY() \
do { \
_Py_INCREF_UNICODE_EMPTY(); \
return unicode_empty; \
} while (0)
/* List of static strings. */
static _Py_Identifier *static_strings;
static _Py_Identifier *static_strings = NULL;
/* Single character Unicode strings in the Latin-1 range are being
shared as well. */
static PyObject *unicode_latin1[256];
static PyObject *unicode_latin1[256] = {NULL};
/* Fast detection of the most frequent whitespace characters */
const unsigned char _Py_ascii_whitespace[] = {
@ -406,9 +426,8 @@ unicode_result_wchar(PyObject *unicode)
len = _PyUnicode_WSTR_LENGTH(unicode);
if (len == 0) {
Py_INCREF(unicode_empty);
Py_DECREF(unicode);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
}
if (len == 1) {
@ -442,8 +461,8 @@ unicode_result_ready(PyObject *unicode)
length = PyUnicode_GET_LENGTH(unicode);
if (length == 0) {
if (unicode != unicode_empty) {
Py_INCREF(unicode_empty);
Py_DECREF(unicode);
_Py_RETURN_UNICODE_EMPTY();
}
return unicode_empty;
}
@ -520,7 +539,7 @@ static OSVERSIONINFOEX winver;
#define BLOOM_MASK unsigned long
static BLOOM_MASK bloom_linebreak;
static BLOOM_MASK bloom_linebreak = ~(BLOOM_MASK)0;
#define BLOOM_ADD(mask, ch) ((mask |= (1UL << ((ch) & (BLOOM_WIDTH - 1)))))
#define BLOOM(mask, ch) ((mask & (1UL << ((ch) & (BLOOM_WIDTH - 1)))))
@ -1602,9 +1621,11 @@ unicode_resize(PyObject **p_unicode, Py_ssize_t length)
return 0;
if (length == 0) {
_Py_INCREF_UNICODE_EMPTY();
if (!unicode_empty)
return -1;
Py_DECREF(*p_unicode);
*p_unicode = unicode_empty;
Py_INCREF(*p_unicode);
return 0;
}
@ -1727,10 +1748,8 @@ PyUnicode_FromUnicode(const Py_UNICODE *u, Py_ssize_t size)
some optimizations which share commonly used objects. */
/* Optimization for empty strings */
if (size == 0 && unicode_empty != NULL) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
/* Single character Unicode objects in the Latin-1 range are
shared when using this constructor */
@ -1889,10 +1908,8 @@ _PyUnicode_FromUCS1(const unsigned char* u, Py_ssize_t size)
PyObject *res;
unsigned char max_char;
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
assert(size > 0);
if (size == 1)
return get_latin1_char(u[0]);
@ -1912,10 +1929,8 @@ _PyUnicode_FromUCS2(const Py_UCS2 *u, Py_ssize_t size)
PyObject *res;
Py_UCS2 max_char;
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
assert(size > 0);
if (size == 1) {
Py_UCS4 ch = u[0];
@ -1950,10 +1965,8 @@ _PyUnicode_FromUCS4(const Py_UCS4 *u, Py_ssize_t size)
PyObject *res;
Py_UCS4 max_char;
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
assert(size > 0);
if (size == 1) {
Py_UCS4 ch = u[0];
@ -2245,10 +2258,8 @@ PyObject *
PyUnicode_FromWideChar(register const wchar_t *w, Py_ssize_t size)
{
if (w == NULL) {
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
PyErr_BadInternalCall();
return NULL;
}
@ -2825,15 +2836,11 @@ PyUnicode_FromEncodedObject(register PyObject *obj,
/* Decoding bytes objects is the most common case and should be fast */
if (PyBytes_Check(obj)) {
if (PyBytes_GET_SIZE(obj) == 0) {
Py_INCREF(unicode_empty);
v = unicode_empty;
}
else {
v = PyUnicode_Decode(
PyBytes_AS_STRING(obj), PyBytes_GET_SIZE(obj),
encoding, errors);
}
if (PyBytes_GET_SIZE(obj) == 0)
_Py_RETURN_UNICODE_EMPTY();
v = PyUnicode_Decode(
PyBytes_AS_STRING(obj), PyBytes_GET_SIZE(obj),
encoding, errors);
return v;
}
@ -2853,12 +2860,11 @@ PyUnicode_FromEncodedObject(register PyObject *obj,
}
if (buffer.len == 0) {
Py_INCREF(unicode_empty);
v = unicode_empty;
PyBuffer_Release(&buffer);
_Py_RETURN_UNICODE_EMPTY();
}
else
v = PyUnicode_Decode((char*) buffer.buf, buffer.len, encoding, errors);
v = PyUnicode_Decode((char*) buffer.buf, buffer.len, encoding, errors);
PyBuffer_Release(&buffer);
return v;
}
@ -4201,8 +4207,7 @@ PyUnicode_DecodeUTF7Stateful(const char *s,
if (size == 0) {
if (consumed)
*consumed = 0;
Py_INCREF(unicode_empty);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
}
/* Start off assuming it's all ASCII. Widen later as necessary. */
@ -4609,8 +4614,7 @@ PyUnicode_DecodeUTF8Stateful(const char *s,
if (size == 0) {
if (consumed)
*consumed = 0;
Py_INCREF(unicode_empty);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
}
/* ASCII is equivalent to the first 128 ordinals in Unicode. */
@ -4868,8 +4872,7 @@ PyUnicode_DecodeUTF32Stateful(const char *s,
if (q == e) {
if (consumed)
*consumed = size;
Py_INCREF(unicode_empty);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
}
#ifdef WORDS_BIGENDIAN
@ -5108,8 +5111,7 @@ PyUnicode_DecodeUTF16Stateful(const char *s,
if (q == e) {
if (consumed)
*consumed = size;
Py_INCREF(unicode_empty);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
}
#if PY_LITTLE_ENDIAN
@ -5386,10 +5388,8 @@ PyUnicode_DecodeUnicodeEscape(const char *s,
Py_ssize_t len;
len = length_of_escaped_ascii_string(s, size);
if (len == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (len == 0)
_Py_RETURN_UNICODE_EMPTY();
/* After length_of_escaped_ascii_string() there are two alternatives,
either the string is pure ASCII with named escapes like \n, etc.
@ -5781,10 +5781,8 @@ PyUnicode_DecodeRawUnicodeEscape(const char *s,
PyObject *errorHandler = NULL;
PyObject *exc = NULL;
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
/* Escaped strings will always be longer than the resulting
Unicode string, so we start with size here and then reduce the
@ -5988,10 +5986,8 @@ _PyUnicode_DecodeUnicodeInternal(const char *s,
1))
return NULL;
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
/* XXX overflow detection missing */
_PyUnicodeWriter_Init(&writer, 0);
@ -6439,10 +6435,8 @@ PyUnicode_DecodeASCII(const char *s,
PyObject *errorHandler = NULL;
PyObject *exc = NULL;
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
/* ASCII is equivalent to the first 128 ordinals in Unicode. */
if (size == 1 && (unsigned char)s[0] < 128)
@ -6820,8 +6814,7 @@ decode_code_page_stateful(int code_page,
if (chunk_size == 0 && done) {
if (v != NULL)
break;
Py_INCREF(unicode_empty);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
}
@ -7298,10 +7291,8 @@ PyUnicode_DecodeCharmap(const char *s,
if (mapping == NULL)
return PyUnicode_DecodeLatin1(s, size, errors);
if (size == 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (size == 0)
_Py_RETURN_UNICODE_EMPTY();
_PyUnicodeWriter_Init(&writer, 0);
if (_PyUnicodeWriter_Prepare(&writer, size, 127) == -1)
goto onError;
@ -9354,9 +9345,7 @@ PyUnicode_Join(PyObject *separator, PyObject *seq)
/* If empty sequence, return u"". */
if (seqlen == 0) {
Py_DECREF(fseq);
Py_INCREF(unicode_empty);
res = unicode_empty;
return res;
_Py_RETURN_UNICODE_EMPTY();
}
/* If singleton sequence with an exact Unicode, return that. */
@ -10056,7 +10045,9 @@ replace(PyObject *self, PyObject *str1,
}
new_size = slen + n * (len2 - len1);
if (new_size == 0) {
Py_INCREF(unicode_empty);
_Py_INCREF_UNICODE_EMPTY();
if (!unicode_empty)
goto error;
u = unicode_empty;
goto done;
}
@ -11559,10 +11550,8 @@ PyUnicode_Substring(PyObject *self, Py_ssize_t start, Py_ssize_t end)
PyErr_SetString(PyExc_IndexError, "string index out of range");
return NULL;
}
if (start >= length || end < start) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (start >= length || end < start)
_Py_RETURN_UNICODE_EMPTY();
length = end - start;
if (PyUnicode_IS_ASCII(self)) {
@ -11689,10 +11678,8 @@ unicode_repeat(PyObject *str, Py_ssize_t len)
PyObject *u;
Py_ssize_t nchars, n;
if (len < 1) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (len < 1)
_Py_RETURN_UNICODE_EMPTY();
/* no repeat, return original string */
if (len == 1)
@ -12832,8 +12819,7 @@ _PyUnicodeWriter_Finish(_PyUnicodeWriter *writer)
{
if (writer->pos == 0) {
Py_XDECREF(writer->buffer);
Py_INCREF(unicode_empty);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
}
if (writer->readonly) {
assert(PyUnicode_GET_LENGTH(writer->buffer) == writer->pos);
@ -13051,8 +13037,7 @@ unicode_subscript(PyObject* self, PyObject* item)
}
if (slicelength <= 0) {
Py_INCREF(unicode_empty);
return unicode_empty;
_Py_RETURN_UNICODE_EMPTY();
} else if (start == 0 && step == 1 &&
slicelength == PyUnicode_GET_LENGTH(self)) {
return unicode_result_unchanged(self);
@ -14056,10 +14041,8 @@ unicode_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oss:str",
kwlist, &x, &encoding, &errors))
return NULL;
if (x == NULL) {
Py_INCREF(unicode_empty);
return unicode_empty;
}
if (x == NULL)
_Py_RETURN_UNICODE_EMPTY();
if (encoding == NULL && errors == NULL)
return PyObject_Str(x);
else
@ -14228,8 +14211,6 @@ PyTypeObject PyUnicode_Type = {
int _PyUnicode_Init(void)
{
int i;
/* XXX - move this array to unicodectype.c ? */
Py_UCS2 linebreak[] = {
0x000A, /* LINE FEED */
@ -14243,13 +14224,11 @@ int _PyUnicode_Init(void)
};
/* Init the implementation */
unicode_empty = PyUnicode_New(0, 0);
_Py_INCREF_UNICODE_EMPTY();
if (!unicode_empty)
Py_FatalError("Can't create empty string");
assert(_PyUnicode_CheckConsistency(unicode_empty, 1));
Py_DECREF(unicode_empty);
for (i = 0; i < 256; i++)
unicode_latin1[i] = NULL;
if (PyType_Ready(&PyUnicode_Type) < 0)
Py_FatalError("Can't initialize 'unicode'");
@ -14289,15 +14268,10 @@ _PyUnicode_Fini(void)
{
int i;
Py_XDECREF(unicode_empty);
unicode_empty = NULL;
Py_CLEAR(unicode_empty);
for (i = 0; i < 256; i++) {
if (unicode_latin1[i]) {
Py_DECREF(unicode_latin1[i]);
unicode_latin1[i] = NULL;
}
}
for (i = 0; i < 256; i++)
Py_CLEAR(unicode_latin1[i]);
_PyUnicode_ClearStaticStrings();
(void)PyUnicode_ClearFreeList();
}
@ -14426,8 +14400,7 @@ _Py_ReleaseInternedUnicodeStrings(void)
"mortal/immortal\n", mortal_size, immortal_size);
Py_DECREF(keys);
PyDict_Clear(interned);
Py_DECREF(interned);
interned = NULL;
Py_CLEAR(interned);
}