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Close #14716: str.format() now uses the new "unicode writer" API instead of the 

PyAccu API. For example, it makes str.format() from 25% to 30% faster on Linux.
This commit is contained in:
Victor Stinner 2012-05-07 12:47:02 +02:00
parent 9fad160411
commit 202fdca133
2 changed files with 148 additions and 170 deletions
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60
Objects/stringlib/unicode_format.h
View File

@ -2,8 +2,6 @@
unicode_format.h -- implementation of str.format().
*/
#include "accu.h"
/* Defines for more efficiently reallocating the string buffer */
#define INITIAL_SIZE_INCREMENT 100
#define SIZE_MULTIPLIER 2
@ -111,33 +109,6 @@ autonumber_state_error(AutoNumberState state, int field_name_is_empty)
}
/************************************************************************/
/*********** Output string management functions ****************/
/************************************************************************/
/*
output_data dumps characters into our output string
buffer.
In some cases, it has to reallocate the string.
It returns a status: 0 for a failed reallocation,
1 for success.
*/
static int
output_data(_PyAccu *acc, PyObject *s, Py_ssize_t start, Py_ssize_t end)
{
PyObject *substring;
int r;
substring = PyUnicode_Substring(s, start, end);
if (substring == NULL)
return 0;
r = _PyAccu_Accumulate(acc, substring);
Py_DECREF(substring);
return r == 0;
}
/************************************************************************/
/*********** Format string parsing -- integers and identifiers *********/
/************************************************************************/
@ -523,7 +494,7 @@ error:
appends to the output.
*/
static int
render_field(PyObject *fieldobj, SubString *format_spec, _PyAccu *acc)
render_field(PyObject *fieldobj, SubString *format_spec, unicode_writer_t *writer)
{
int ok = 0;
PyObject *result = NULL;
@ -566,7 +537,8 @@ render_field(PyObject *fieldobj, SubString *format_spec, _PyAccu *acc)
goto done;
assert(PyUnicode_Check(result));
ok = output_data(acc, result, 0, PyUnicode_GET_LENGTH(result));
ok = (unicode_writer_write_str(writer, result, 0, PyUnicode_GET_LENGTH(result)) == 0);
done:
Py_XDECREF(format_spec_object);
Py_XDECREF(result);
@ -831,7 +803,7 @@ do_conversion(PyObject *obj, Py_UCS4 conversion)
static int
output_markup(SubString *field_name, SubString *format_spec,
int format_spec_needs_expanding, Py_UCS4 conversion,
_PyAccu *acc, PyObject *args, PyObject *kwargs,
unicode_writer_t *writer, PyObject *args, PyObject *kwargs,
int recursion_depth, AutoNumber *auto_number)
{
PyObject *tmp = NULL;
@ -872,7 +844,7 @@ output_markup(SubString *field_name, SubString *format_spec,
else
actual_format_spec = format_spec;
if (render_field(fieldobj, actual_format_spec, acc) == 0)
if (render_field(fieldobj, actual_format_spec, writer) == 0)
goto done;
result = 1;
@ -892,7 +864,7 @@ done:
*/
static int
do_markup(SubString *input, PyObject *args, PyObject *kwargs,
_PyAccu *acc, int recursion_depth, AutoNumber *auto_number)
unicode_writer_t *writer, int recursion_depth, AutoNumber *auto_number)
{
MarkupIterator iter;
int format_spec_needs_expanding;
@ -902,17 +874,21 @@ do_markup(SubString *input, PyObject *args, PyObject *kwargs,
SubString field_name;
SubString format_spec;
Py_UCS4 conversion;
int err;
MarkupIterator_init(&iter, input->str, input->start, input->end);
while ((result = MarkupIterator_next(&iter, &literal, &field_present,
&field_name, &format_spec,
&conversion,
&format_spec_needs_expanding)) == 2) {
if (!output_data(acc, literal.str, literal.start, literal.end))
err = unicode_writer_write_str(writer,
literal.str, literal.start,
literal.end - literal.start);
if (err == -1)
return 0;
if (field_present)
if (!output_markup(&field_name, &format_spec,
format_spec_needs_expanding, conversion, acc,
format_spec_needs_expanding, conversion, writer,
args, kwargs, recursion_depth, auto_number))
return 0;
}
@ -928,7 +904,8 @@ static PyObject *
build_string(SubString *input, PyObject *args, PyObject *kwargs,
int recursion_depth, AutoNumber *auto_number)
{
_PyAccu acc;
unicode_writer_t writer;
Py_ssize_t initlen;
/* check the recursion level */
if (recursion_depth <= 0) {
@ -937,16 +914,17 @@ build_string(SubString *input, PyObject *args, PyObject *kwargs,
return NULL;
}
if (_PyAccu_Init(&acc))
initlen = PyUnicode_GET_LENGTH(input->str) + 100;
if (unicode_writer_init(&writer, initlen, 127) == -1)
return NULL;
if (!do_markup(input, args, kwargs, &acc, recursion_depth,
if (!do_markup(input, args, kwargs, &writer, recursion_depth,
auto_number)) {
_PyAccu_Destroy(&acc);
unicode_writer_dealloc(&writer);
return NULL;
}
return _PyAccu_Finish(&acc);
return unicode_writer_finish(&writer);
}
/************************************************************************/

258
Objects/unicodeobject.c
View File

@ -13200,6 +13200,135 @@ unicode_endswith(PyObject *self,
return PyBool_FromLong(result);
}
typedef struct {
PyObject *buffer;
void *data;
enum PyUnicode_Kind kind;
Py_UCS4 maxchar;
Py_ssize_t pos;
} unicode_writer_t;
Py_LOCAL_INLINE(void)
unicode_writer_update(unicode_writer_t *writer)
{
writer->maxchar = PyUnicode_MAX_CHAR_VALUE(writer->buffer);
writer->data = PyUnicode_DATA(writer->buffer);
writer->kind = PyUnicode_KIND(writer->buffer);
}
Py_LOCAL(int)
unicode_writer_init(unicode_writer_t *writer,
Py_ssize_t length, Py_UCS4 maxchar)
{
writer->pos = 0;
writer->buffer = PyUnicode_New(length, maxchar);
if (writer->buffer == NULL)
return -1;
unicode_writer_update(writer);
return 0;
}
Py_LOCAL_INLINE(int)
unicode_writer_prepare(unicode_writer_t *writer,
Py_ssize_t length, Py_UCS4 maxchar)
{
Py_ssize_t newlen;
PyObject *newbuffer;
if (length > PY_SSIZE_T_MAX - writer->pos) {
PyErr_NoMemory();
return -1;
}
newlen = writer->pos + length;
if (newlen > PyUnicode_GET_LENGTH(writer->buffer)) {
/* overallocate 25% to limit the number of resize */
if (newlen <= (PY_SSIZE_T_MAX - newlen / 4))
newlen += newlen / 4;
if (maxchar > writer->maxchar) {
/* resize + widen */
newbuffer = PyUnicode_New(newlen, maxchar);
if (newbuffer == NULL)
return -1;
PyUnicode_CopyCharacters(newbuffer, 0,
writer->buffer, 0, writer->pos);
Py_DECREF(writer->buffer);
}
else {
newbuffer = resize_compact(writer->buffer, newlen);
if (newbuffer == NULL)
return -1;
}
writer->buffer = newbuffer;
unicode_writer_update(writer);
}
else if (maxchar > writer->maxchar) {
if (unicode_widen(&writer->buffer, writer->pos, maxchar) < 0)
return -1;
unicode_writer_update(writer);
}
return 0;
}
Py_LOCAL_INLINE(int)
unicode_writer_write_str(
unicode_writer_t *writer,
PyObject *str, Py_ssize_t start, Py_ssize_t length)
{
Py_UCS4 maxchar;
assert(str != NULL);
assert(PyUnicode_Check(str));
if (PyUnicode_READY(str) == -1)
return -1;
assert(0 <= start);
assert(0 <= length);
assert(start + length <= PyUnicode_GET_LENGTH(str));
if (length == 0)
return 0;
maxchar = _PyUnicode_FindMaxChar(str, start, start + length);
if (unicode_writer_prepare(writer, length, maxchar) == -1)
return -1;
assert((writer->pos + length) <= PyUnicode_GET_LENGTH(writer->buffer));
copy_characters(writer->buffer, writer->pos,
str, start, length);
writer->pos += length;
return 0;
}
Py_LOCAL_INLINE(int)
unicode_writer_write_char(
unicode_writer_t *writer,
Py_UCS4 ch)
{
if (unicode_writer_prepare(writer, 1, ch) == -1)
return -1;
assert((writer->pos + 1) <= PyUnicode_GET_LENGTH(writer->buffer));
PyUnicode_WRITE(writer->kind, writer->data, writer->pos, ch);
writer->pos += 1;
return 0;
}
Py_LOCAL(PyObject *)
unicode_writer_finish(unicode_writer_t *writer)
{
if (PyUnicode_Resize(&writer->buffer, writer->pos) < 0) {
Py_DECREF(writer->buffer);
return NULL;
}
return writer->buffer;
}
Py_LOCAL(void)
unicode_writer_dealloc(unicode_writer_t *writer)
{
Py_CLEAR(writer->buffer);
}
#include "stringlib/unicode_format.h"
PyDoc_STRVAR(format__doc__,
@ -13649,135 +13778,6 @@ formatchar(PyObject *v)
return (Py_UCS4) -1;
}
typedef struct {
PyObject *buffer;
void *data;
enum PyUnicode_Kind kind;
Py_UCS4 maxchar;
Py_ssize_t pos;
} unicode_writer_t;
Py_LOCAL_INLINE(void)
unicode_writer_update(unicode_writer_t *writer)
{
writer->maxchar = PyUnicode_MAX_CHAR_VALUE(writer->buffer);
writer->data = PyUnicode_DATA(writer->buffer);
writer->kind = PyUnicode_KIND(writer->buffer);
}
Py_LOCAL(int)
unicode_writer_init(unicode_writer_t *writer,
Py_ssize_t length, Py_UCS4 maxchar)
{
writer->pos = 0;
writer->buffer = PyUnicode_New(length, maxchar);
if (writer->buffer == NULL)
return -1;
unicode_writer_update(writer);
return 0;
}
Py_LOCAL_INLINE(int)
unicode_writer_prepare(unicode_writer_t *writer,
Py_ssize_t length, Py_UCS4 maxchar)
{
Py_ssize_t newlen;
PyObject *newbuffer;
if (length > PY_SSIZE_T_MAX - writer->pos) {
PyErr_NoMemory();
return -1;
}
newlen = writer->pos + length;
if (newlen > PyUnicode_GET_LENGTH(writer->buffer)) {
/* overallocate 25% to limit the number of resize */
if (newlen <= (PY_SSIZE_T_MAX - newlen / 4))
newlen += newlen / 4;
if (maxchar > writer->maxchar) {
/* resize + widen */
newbuffer = PyUnicode_New(newlen, maxchar);
if (newbuffer == NULL)
return -1;
PyUnicode_CopyCharacters(newbuffer, 0,
writer->buffer, 0, writer->pos);
Py_DECREF(writer->buffer);
}
else {
newbuffer = resize_compact(writer->buffer, newlen);
if (newbuffer == NULL)
return -1;
}
writer->buffer = newbuffer;
unicode_writer_update(writer);
}
else if (maxchar > writer->maxchar) {
if (unicode_widen(&writer->buffer, writer->pos, maxchar) < 0)
return -1;
unicode_writer_update(writer);
}
return 0;
}
Py_LOCAL_INLINE(int)
unicode_writer_write_str(
unicode_writer_t *writer,
PyObject *str, Py_ssize_t start, Py_ssize_t length)
{
Py_UCS4 maxchar;
assert(str != NULL);
assert(PyUnicode_Check(str));
if (PyUnicode_READY(str) == -1)
return -1;
assert(0 <= start);
assert(0 <= length);
assert(start + length <= PyUnicode_GET_LENGTH(str));
if (length == 0)
return 0;
maxchar = _PyUnicode_FindMaxChar(str, start, start + length);
if (unicode_writer_prepare(writer, length, maxchar) == -1)
return -1;
assert((writer->pos + length) <= PyUnicode_GET_LENGTH(writer->buffer));
copy_characters(writer->buffer, writer->pos,
str, start, length);
writer->pos += length;
return 0;
}
Py_LOCAL_INLINE(int)
unicode_writer_write_char(
unicode_writer_t *writer,
Py_UCS4 ch)
{
if (unicode_writer_prepare(writer, 1, ch) == -1)
return -1;
assert((writer->pos + 1) <= PyUnicode_GET_LENGTH(writer->buffer));
PyUnicode_WRITE(writer->kind, writer->data, writer->pos, ch);
writer->pos += 1;
return 0;
}
Py_LOCAL(PyObject *)
unicode_writer_finish(unicode_writer_t *writer)
{
if (PyUnicode_Resize(&writer->buffer, writer->pos) < 0) {
Py_DECREF(writer->buffer);
return NULL;
}
return writer->buffer;
}
Py_LOCAL(void)
unicode_writer_dealloc(unicode_writer_t *writer)
{
Py_CLEAR(writer->buffer);
}
PyObject *
PyUnicode_Format(PyObject *format, PyObject *args)
{