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Enhance NewRef operations by vstinner · Pull Request #52 · python/pythoncapi-compat · GitHub

  1. python
  2. pythoncapi-compat

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Enhance NewRef operations #52

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Merged
vstinner merged 1 commit into from
Nov 10, 2022
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Merged

Enhance NewRef operations #52

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53 changes: 47 additions & 6 deletions tests/test_upgrade_pythoncapi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -399,6 +399,10 @@ def test_py_incref_return(self):
return obj;
}

PyObject* same_line(PyObject *obj) {
Py_INCREF(obj); return obj;
}

PyObject* new_xref(PyObject *obj) {
Py_XINCREF(obj);
return obj;
Expand All @@ -410,6 +414,10 @@ def test_py_incref_return(self):
return Py_NewRef(obj);
}

PyObject* same_line(PyObject *obj) {
return Py_NewRef(obj);
}

PyObject* new_xref(PyObject *obj) {
return Py_XNewRef(obj);
}
Expand All @@ -418,7 +426,7 @@ def test_py_incref_return(self):
@unittest.skipUnless(upgrade_pythoncapi.FORCE_NEWREF, 'FORCE_NEWREF=False')
def test_py_incref_assign(self):
self.check_replace("""
void set_attr(MyStruct *obj, PyObject *value)
void set_attr(MyStruct *obj, PyObject *value, int test)
{
// 1
Py_INCREF(value);
Expand All @@ -429,21 +437,43 @@ def test_py_incref_assign(self):
// 3
obj->attr = value;
Py_INCREF(obj->attr);
// 4
obj->attr = value; Py_INCREF(obj->attr);

// same line 1
obj->attr = value; Py_INCREF(value);
// same line 2
if (test) { obj->attr = value; Py_INCREF(obj->attr); }
// same line 3
if (test) { Py_INCREF(value); obj->attr = value; }

// cast 1
Py_INCREF(value);
obj->attr = (PyObject*)value;
// cast 2
obj->attr = (PyObject*)value;
Py_INCREF(value);
}
""", """
#include "pythoncapi_compat.h"

void set_attr(MyStruct *obj, PyObject *value)
void set_attr(MyStruct *obj, PyObject *value, int test)
{
// 1
obj->attr = Py_NewRef(value);
// 2
obj->attr = Py_NewRef(value);
// 3
obj->attr = Py_NewRef(value);
// 4

// same line 1
obj->attr = Py_NewRef(value);
// same line 2
if (test) { obj->attr = Py_NewRef(value); }
// same line 3
if (test) { obj->attr = Py_NewRef(value); }

// cast 1
obj->attr = Py_NewRef(value);
// cast 2
obj->attr = Py_NewRef(value);
}
""")
Expand Down Expand Up @@ -476,7 +506,7 @@ def test_py_incref_assign(self):
""")

self.check_dont_replace("""
void true_false(int test)
void test1(int test)
{
PyObject *res;
if (test)
Expand All @@ -487,6 +517,17 @@ def test_py_incref_assign(self):

Py_DECREF(res);
}

int test2(struct datetime* result, PyObject *tzinfo)
{
int res = 0;
if (test)
res = 1;
else
Py_INCREF(tzinfo);
result->tzinfo = tzinfo;
return res;
}
""")

def test_py_is(self):
Expand Down
60 changes: 48 additions & 12 deletions upgrade_pythoncapi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,12 +46,13 @@


def same_indentation(group):
# the regex must have re.MULTILINE flag
return fr'{SPACE_REGEX}*(?:{NEWLINE_REGEX}{group})?'


def get_member_regex_str(member):
# Match "var->member".
return fr'\b({EXPR_REGEX}) *-> *%s\b' % member
return fr'\b({EXPR_REGEX}) *-> *{member}\b'


def get_member_regex(member):
Expand All @@ -67,7 +68,7 @@ def get_member_regex(member):

def assign_regex_str(var, expr):
# Match "var = expr;".
return (r'%s\s*=\s*%s\s*;' % (var, expr))
return fr'{var}\s*=\s*{expr}\s*;'


def set_member_regex(member):
Expand All @@ -80,7 +81,7 @@ def call_assign_regex(name):
# Match "Py_TYPE(expr) = expr;".
# Don't match "assert(Py_TYPE(expr) == expr);".
# Tolerate spaces
regex = (r'%s *\( *(.+) *\) *= *([^=].*) *;' % name)
regex = fr'{name} *\( *(.+) *\) *= *([^=].*) *;'
return re.compile(regex)


Expand Down Expand Up @@ -251,30 +252,66 @@ class Py_INCREF_return(Operation):
+ r'return \3;',
re.MULTILINE),
r'\1return Py_\2NewRef(\3);'),

# Same regex than the previous one,
# but the two statements are on the same line.
(re.compile(fr'Py_(X?)INCREF\(({EXPR_REGEX})\)\s*;'
+ fr'{SPACE_REGEX}*'
+ r'return \2;',
re.MULTILINE),
r'return Py_\1NewRef(\2);'),
)
# Need Py_NewRef(): new in Python 3.10
NEED_PYTHONCAPI_COMPAT = True


def optional_ptr_cast(to_type):
return fr'(?:\({to_type}\s*\*\))?'

class Py_INCREF_assign(Operation):
NAME = "Py_INCREF_assign"
REPLACE = (
# "y = x; Py_INCREF(x);" => "y = Py_NewRef(x);"
# "y = x; Py_INCREF(y);" => "y = Py_NewRef(x);"
# "y = x; Py_XINCREF(x);" => "y = Py_XNewRef(x);"
# "y = x; Py_XINCREF(y);" => "y = Py_XNewRef(x);"
# "y = (PyObject*)x; Py_XINCREF(y);" => "y = Py_XNewRef(x);"
# The two statements must have the same indentation, otherwise the
# regex does not match.
(re.compile(fr'({INDENTATION_REGEX})'
+ assign_regex_str(r'(%s)' % EXPR_REGEX, r'(%s)' % EXPR_REGEX)
+ assign_regex_str(fr'({EXPR_REGEX})',
optional_ptr_cast('PyObject') + fr'({EXPR_REGEX})')
+ same_indentation(r'\1')
+ r'Py_(X?)INCREF\((?:\2|\3)\);',
re.MULTILINE),
r'\1\2 = Py_\4NewRef(\3);'),

# Same regex than the previous one,
# but the two statements are on the same line.
(re.compile(assign_regex_str(fr'({EXPR_REGEX})',
optional_ptr_cast('PyObject') + fr'({EXPR_REGEX})')
+ fr'{SPACE_REGEX}*'
+ r'Py_(X?)INCREF\((?:\1|\2)\);'),
r'\1 = Py_\3NewRef(\2);'),

# "Py_INCREF(x); y = x;" => "y = Py_NewRef(x)"
# "Py_XINCREF(x); y = x;" => "y = Py_XNewRef(x)"
(re.compile(r'Py_(X?)INCREF\((%s)\);\s*' % EXPR_REGEX
+ assign_regex_str(r'(%s)' % EXPR_REGEX, r'\2')),
# The two statements must have the same indentation, otherwise the
# regex does not match.
(re.compile(fr'({INDENTATION_REGEX})'
+ fr'Py_(X?)INCREF\(({EXPR_REGEX})\);'
+ same_indentation(r'\1')
+ assign_regex_str(fr'({EXPR_REGEX})',
optional_ptr_cast('PyObject') + r'\3'),
re.MULTILINE),
r'\1\4 = Py_\2NewRef(\3);'),

# Same regex than the previous one,
# but the two statements are on the same line.
(re.compile(fr'Py_(X?)INCREF\(({EXPR_REGEX})\);'
+ fr'{SPACE_REGEX}*'
+ assign_regex_str(fr'({EXPR_REGEX})',
optional_ptr_cast('PyObject') + r'\2')),
r'\3 = Py_\1NewRef(\2);'),
)
# Need Py_NewRef(): new in Python 3.10
Expand All @@ -292,7 +329,7 @@ def replace2(regs):
return f'{x} = _Py_StealRef({y});'

REPLACE = []
expr = r'(%s)' % EXPR_REGEX
expr = fr'({EXPR_REGEX})'
for name in ('None', 'True', 'False'):
REPLACE.extend((
(re.compile(fr'{expr} == Py_{name}\b'),
Expand Down Expand Up @@ -351,7 +388,7 @@ def log(self, msg=''):
print(msg, file=sys.stderr, flush=True)

def warning(self, msg):
self.log("WARNING: %s" % msg)
self.log(f"WARNING: {msg}")

def _get_operations(self, parser):
args_names = self.args.operations.split(',')
Expand Down Expand Up @@ -381,7 +418,7 @@ def _get_operations(self, parser):
operations.append(operation)

if wanted:
print("invalid operations: %s" % ','.join(wanted))
print(f"invalid operations: {','.join(wanted)}")
print()
self.usage(parser)
sys.exit(1)
Expand Down Expand Up @@ -479,8 +516,7 @@ def _walk_dir(self, path):
empty = False

if empty:
self.warning("Directory %s doesn't contain any "
"C file" % path)
self.warning(f"Directory {path} doesn't contain any C file")
self.exitcode = 1

def walk(self, paths):
Expand All @@ -491,7 +527,7 @@ def walk(self, paths):
elif os.path.exists(path):
yield path
else:
self.warning("Path %s does not exist" % path)
self.warning(f"Path {path} does not exist")
self.exitcode = 1

def get_latest_header(self, base_dir):
Expand Down
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