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gh-120317: Lock around global state in the tokenize module #120318

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Merged
lysnikolaou merged 13 commits into from
Jul 16, 2024
Merged

gh-120317: Lock around global state in the tokenize module #120318

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900dd6a
gh-120317: Lock around tokenizer calls in the tokenizer module
lysnikolaou Jun 10, 2024
abf568a
Use Py_BEGIN_CRITICAL_SECTION
lysnikolaou Jun 10, 2024
9dfe174
Add more locking around global tokenizer state
lysnikolaou Jun 10, 2024
5fd07b6
Add test
lysnikolaou Jun 10, 2024
814d9af
Address feedback & improve test
lysnikolaou Jun 10, 2024
c1093be
Guard atomic store behind Py_GIL_DISABLED
lysnikolaou Jun 10, 2024
117d256
Add requires working threading decorator to test
lysnikolaou Jun 10, 2024
975f01a
Merge branch 'main' into tokenize-thread-safety
lysnikolaou Jun 11, 2024
ca466fa
Lock around all of tokenizeriter_next
lysnikolaou Jun 11, 2024
3abb8ab
Merge branch 'main' into tokenize-thread-safety
lysnikolaou Jun 12, 2024
601e539
Fix formatting
lysnikolaou Jun 12, 2024
6290f19
Merge branch 'main' into tokenize-thread-safety
lysnikolaou Jul 1, 2024
0ddde2f
Change sleeping time
lysnikolaou Jul 1, 2024
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Merge branch 'main' into tokenize-thread-safety
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@lysnikolaou
lysnikolaou committed Jun 12, 2024
commit 3abb8ab437baaf7c6fcd83b22ecbbd8449ad5017
27 changes: 18 additions & 9 deletions Python/Python-tokenize.c
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Original file line number Diff line number Diff line change
Expand Up @@ -181,33 +181,41 @@ _tokenizer_error(tokenizeriterobject *it)
}

static PyObject *
_get_current_line(tokenizeriterobject *it, const char *line_start, Py_ssize_t size)
_get_current_line(tokenizeriterobject *it, const char *line_start, Py_ssize_t size,
int *line_changed)
{
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_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(it);
PyObject *line = it->last_line;
PyObject *line;
if (it->tok->lineno != it->last_lineno) {
// Line has changed since last token, so we fetch the new line and cache it
// in the iter object.
Py_XDECREF(it->last_line);
line = PyUnicode_DecodeUTF8(line_start, size, "replace");
it->last_line = line;
if (it->tok->lineno != it->last_end_lineno) {
it->byte_col_offset_diff = 0;
}
it->byte_col_offset_diff = 0;
} else {
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Outdated
line = it->last_line;
*line_changed = 0;
}
return line;
}
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static void
_get_col_offsets(tokenizeriterobject *it, struct token token, const char *line_start,
PyObject *line, Py_ssize_t lineno, Py_ssize_t end_lineno,
PyObject *line, int line_changed, Py_ssize_t lineno, Py_ssize_t end_lineno,
Py_ssize_t *col_offset, Py_ssize_t *end_col_offset)
{
_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(it);
Py_ssize_t byte_offset = -1;
if (token.start != NULL && token.start >= line_start) {
byte_offset = token.start - line_start;
*col_offset = byte_offset - it->byte_col_offset_diff;
if (line_changed) {
*col_offset = _PyPegen_byte_offset_to_character_offset_line(line, 0, byte_offset);
it->byte_col_offset_diff = byte_offset - *col_offset;
}
else {
*col_offset = byte_offset - it->byte_col_offset_diff;
}
}

if (token.end != NULL && token.end >= it->tok->line_start) {
Expand Down Expand Up @@ -279,7 +287,7 @@ tokenizeriter_next(tokenizeriterobject *it)
size -= 1;
}

line = _get_current_line(it, line_start, size);
line = _get_current_line(it, line_start, size, &line_changed);
}
if (line == NULL) {
Py_DECREF(str);
Expand All @@ -290,7 +298,8 @@ tokenizeriter_next(tokenizeriterobject *it)
Py_ssize_t end_lineno = it->tok->lineno;
Py_ssize_t col_offset = -1;
Py_ssize_t end_col_offset = -1;
_get_col_offsets(it, token, line_start, line, lineno, end_lineno, &col_offset, &end_col_offset);
_get_col_offsets(it, token, line_start, line, line_changed,
lineno, end_lineno, &col_offset, &end_col_offset);

if (it->tok->tok_extra_tokens) {
if (is_trailing_token) {
Expand Down
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