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GH-91079: Decouple C stack overflow checks from Python recursion checks. (GH-96510)

This commit is contained in:
Mark Shannon 2022-10-05 01:34:03 +01:00 committed by GitHub
parent 0ff8fd6583
commit 76449350b3
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
22 changed files with 165 additions and 99 deletions
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16
Include/cpython/pystate.h
View File

@ -95,8 +95,10 @@ struct _ts {
/* Was this thread state statically allocated? */
int _static;
int recursion_remaining;
int recursion_limit;
int py_recursion_remaining;
int py_recursion_limit;
int c_recursion_remaining;
int recursion_headroom; /* Allow 50 more calls to handle any errors. */
/* 'tracing' keeps track of the execution depth when tracing/profiling.
@ -202,6 +204,16 @@ struct _ts {
_PyCFrame root_cframe;
};
/* WASI has limited call stack. Python's recursion limit depends on code
layout, optimization, and WASI runtime. Wasmtime can handle about 700
recursions, sometimes less. 500 is a more conservative limit. */
#ifndef C_RECURSION_LIMIT
# ifdef __wasi__
# define C_RECURSION_LIMIT 500
# else
# define C_RECURSION_LIMIT 800
# endif
#endif
/* other API */

21
Include/internal/pycore_ceval.h
View File

@ -12,15 +12,8 @@ extern "C" {
struct pyruntimestate;
struct _ceval_runtime_state;
/* WASI has limited call stack. Python's recursion limit depends on code
layout, optimization, and WASI runtime. Wasmtime can handle about 700-750
recursions, sometimes less. 600 is a more conservative limit. */
#ifndef Py_DEFAULT_RECURSION_LIMIT
# ifdef __wasi__
# define Py_DEFAULT_RECURSION_LIMIT 600
# else
# define Py_DEFAULT_RECURSION_LIMIT 1000
# endif
# define Py_DEFAULT_RECURSION_LIMIT 1000
#endif
#include "pycore_interp.h" // PyInterpreterState.eval_frame
@ -118,12 +111,12 @@ extern void _PyEval_DeactivateOpCache(void);
/* With USE_STACKCHECK macro defined, trigger stack checks in
_Py_CheckRecursiveCall() on every 64th call to _Py_EnterRecursiveCall. */
static inline int _Py_MakeRecCheck(PyThreadState *tstate) {
return (tstate->recursion_remaining-- <= 0
|| (tstate->recursion_remaining & 63) == 0);
return (tstate->c_recursion_remaining-- <= 0
|| (tstate->c_recursion_remaining & 63) == 0);
}
#else
static inline int _Py_MakeRecCheck(PyThreadState *tstate) {
return tstate->recursion_remaining-- <= 0;
return tstate->c_recursion_remaining-- <= 0;
}
#endif
@ -131,6 +124,9 @@ PyAPI_FUNC(int) _Py_CheckRecursiveCall(
PyThreadState *tstate,
const char *where);
int _Py_CheckRecursiveCallPy(
PyThreadState *tstate);
static inline int _Py_EnterRecursiveCallTstate(PyThreadState *tstate,
const char *where) {
return (_Py_MakeRecCheck(tstate) && _Py_CheckRecursiveCall(tstate, where));
@ -142,7 +138,7 @@ static inline int _Py_EnterRecursiveCall(const char *where) {
}
static inline void _Py_LeaveRecursiveCallTstate(PyThreadState *tstate) {
tstate->recursion_remaining++;
tstate->c_recursion_remaining++;
}
static inline void _Py_LeaveRecursiveCall(void) {
@ -157,6 +153,7 @@ extern PyObject* _Py_MakeCoro(PyFunctionObject *func);
extern int _Py_HandlePending(PyThreadState *tstate);
#ifdef __cplusplus
}
#endif

2
Include/internal/pycore_runtime_init.h
View File

@ -68,7 +68,7 @@ extern "C" {
#define _PyThreadState_INIT \
{ \
._static = 1, \
.recursion_limit = Py_DEFAULT_RECURSION_LIMIT, \
.py_recursion_limit = Py_DEFAULT_RECURSION_LIMIT, \
.context_ver = 1, \
}

5
Lib/test/support/__init__.py
View File

@ -60,7 +60,7 @@ __all__ = [
"run_with_tz", "PGO", "missing_compiler_executable",
"ALWAYS_EQ", "NEVER_EQ", "LARGEST", "SMALLEST",
"LOOPBACK_TIMEOUT", "INTERNET_TIMEOUT", "SHORT_TIMEOUT", "LONG_TIMEOUT",
"Py_DEBUG",
"Py_DEBUG", "EXCEEDS_RECURSION_LIMIT",
]
@ -2352,3 +2352,6 @@ def adjust_int_max_str_digits(max_digits):
yield
finally:
sys.set_int_max_str_digits(current)
#For recursion tests, easily exceeds default recursion limit
EXCEEDS_RECURSION_LIMIT = 5000

6
Lib/test/test_ast.py
View File

@ -825,9 +825,9 @@ class AST_Tests(unittest.TestCase):
@support.cpython_only
def test_ast_recursion_limit(self):
fail_depth = sys.getrecursionlimit() * 3
crash_depth = sys.getrecursionlimit() * 300
success_depth = int(fail_depth * 0.75)
fail_depth = support.EXCEEDS_RECURSION_LIMIT
crash_depth = 100_000
success_depth = 1200
def check_limit(prefix, repeated):
expect_ok = prefix + repeated * success_depth

38
Lib/test/test_call.py
View File

@ -864,6 +864,44 @@ class TestErrorMessagesUseQualifiedName(unittest.TestCase):
with self.check_raises_type_error(msg):
A().method_two_args("x", "y", x="oops")
@cpython_only
class TestRecursion(unittest.TestCase):
def test_super_deep(self):
def recurse(n):
if n:
recurse(n-1)
def py_recurse(n, m):
if n:
py_recurse(n-1, m)
else:
c_py_recurse(m-1)
def c_recurse(n):
if n:
_testcapi.pyobject_fastcall(c_recurse, (n-1,))
def c_py_recurse(m):
if m:
_testcapi.pyobject_fastcall(py_recurse, (1000, m))
depth = sys.getrecursionlimit()
sys.setrecursionlimit(100_000)
try:
recurse(90_000)
with self.assertRaises(RecursionError):
recurse(101_000)
c_recurse(100)
with self.assertRaises(RecursionError):
c_recurse(90_000)
c_py_recurse(90)
with self.assertRaises(RecursionError):
c_py_recurse(100_000)
finally:
sys.setrecursionlimit(depth)
if __name__ == "__main__":
unittest.main()

2
Lib/test/test_collections.py
View File

@ -545,7 +545,7 @@ class TestNamedTuple(unittest.TestCase):
self.assertEqual(Dot(1)._replace(d=999), (999,))
self.assertEqual(Dot(1)._fields, ('d',))
n = 5000
n = support.EXCEEDS_RECURSION_LIMIT
names = list(set(''.join([choice(string.ascii_letters)
for j in range(10)]) for i in range(n)))
n = len(names)

3
Lib/test/test_compile.py
View File

@ -111,8 +111,7 @@ class TestSpecifics(unittest.TestCase):
@unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI")
def test_extended_arg(self):
# default: 1000 * 2.5 = 2500 repetitions
repeat = int(sys.getrecursionlimit() * 2.5)
repeat = 2000
longexpr = 'x = x or ' + '-x' * repeat
g = {}
code = '''

8
Lib/test/test_dynamic.py
View File

@ -140,11 +140,11 @@ class RebindBuiltinsTests(unittest.TestCase):
def __missing__(self, key):
return int(key.removeprefix("_number_"))
# 1,000 on most systems
limit = sys.getrecursionlimit()
code = "lambda: " + "+".join(f"_number_{i}" for i in range(limit))
# Need more than 256 variables to use EXTENDED_ARGS
variables = 400
code = "lambda: " + "+".join(f"_number_{i}" for i in range(variables))
sum_func = eval(code, MyGlobals())
expected = sum(range(limit))
expected = sum(range(variables))
# Warm up the the function for quickening (PEP 659)
for _ in range(30):
self.assertEqual(sum_func(), expected)

8
Lib/test/test_exceptions.py
View File

@ -1372,6 +1372,7 @@ class ExceptionTests(unittest.TestCase):
code = """if 1:
import sys
from _testinternalcapi import get_recursion_depth
from test import support
class MyException(Exception): pass
@ -1399,13 +1400,8 @@ class ExceptionTests(unittest.TestCase):
generator = gen()
next(generator)
recursionlimit = sys.getrecursionlimit()
depth = get_recursion_depth()
try:
# Upon the last recursive invocation of recurse(),
# tstate->recursion_depth is equal to (recursion_limit - 1)
# and is equal to recursion_limit when _gen_throw() calls
# PyErr_NormalizeException().
recurse(setrecursionlimit(depth + 2) - depth)
recurse(support.EXCEEDS_RECURSION_LIMIT)
finally:
sys.setrecursionlimit(recursionlimit)
print('Done.')

12
Lib/test/test_isinstance.py
View File

@ -8,7 +8,7 @@ import typing
from test import support
class TestIsInstanceExceptions(unittest.TestCase):
# Test to make sure that an AttributeError when accessing the instance's
# class's bases is masked. This was actually a bug in Python 2.2 and
@ -97,7 +97,7 @@ class TestIsInstanceExceptions(unittest.TestCase):
class D: pass
self.assertRaises(RuntimeError, isinstance, c, D)
# These tests are similar to above, but tickle certain code paths in
# issubclass() instead of isinstance() -- really PyObject_IsSubclass()
# vs. PyObject_IsInstance().
@ -147,7 +147,7 @@ class TestIsSubclassExceptions(unittest.TestCase):
self.assertRaises(TypeError, issubclass, B, C())
# meta classes for creating abstract classes and instances
class AbstractClass(object):
def __init__(self, bases):
@ -179,7 +179,7 @@ class Super:
class Child(Super):
pass
class TestIsInstanceIsSubclass(unittest.TestCase):
# Tests to ensure that isinstance and issubclass work on abstract
# classes and instances. Before the 2.2 release, TypeErrors were
@ -353,10 +353,10 @@ def blowstack(fxn, arg, compare_to):
# Make sure that calling isinstance with a deeply nested tuple for its
# argument will raise RecursionError eventually.
tuple_arg = (compare_to,)
for cnt in range(sys.getrecursionlimit()+5):
for cnt in range(support.EXCEEDS_RECURSION_LIMIT):
tuple_arg = (tuple_arg,)
fxn(arg, tuple_arg)
if __name__ == '__main__':
unittest.main()

3
Lib/test/test_marshal.py
View File

@ -117,7 +117,8 @@ class CodeTestCase(unittest.TestCase):
def test_many_codeobjects(self):
# Issue2957: bad recursion count on code objects
count = 5000 # more than MAX_MARSHAL_STACK_DEPTH
# more than MAX_MARSHAL_STACK_DEPTH
count = support.EXCEEDS_RECURSION_LIMIT
codes = (ExceptionTestCase.test_exceptions.__code__,) * count
marshal.loads(marshal.dumps(codes))

3
Misc/NEWS.d/next/Core and Builtins/2022-09-05-09-56-32.gh-issue-91079.H4-DdU.rst Normal file
View File

@ -0,0 +1,3 @@
Separate Python recursion checking from C recursion checking which reduces
the chance of C stack overflow and allows the recursion limit to be
increased safely.

4
Modules/_testinternalcapi.c
View File

@ -44,9 +44,7 @@ get_recursion_depth(PyObject *self, PyObject *Py_UNUSED(args))
{
PyThreadState *tstate = _PyThreadState_GET();
/* subtract one to ignore the frame of the get_recursion_depth() call */
return PyLong_FromLong(tstate->recursion_limit - tstate->recursion_remaining - 1);
return PyLong_FromLong(tstate->py_recursion_limit - tstate->py_recursion_remaining);
}

9
Parser/asdl_c.py
View File

@ -1380,7 +1380,6 @@ PyObject* PyAST_mod2obj(mod_ty t)
return NULL;
}
int recursion_limit = Py_GetRecursionLimit();
int starting_recursion_depth;
/* Be careful here to prevent overflow. */
int COMPILER_STACK_FRAME_SCALE = 3;
@ -1388,11 +1387,9 @@ PyObject* PyAST_mod2obj(mod_ty t)
if (!tstate) {
return 0;
}
state->recursion_limit = (recursion_limit < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_limit * COMPILER_STACK_FRAME_SCALE : recursion_limit;
int recursion_depth = tstate->recursion_limit - tstate->recursion_remaining;
starting_recursion_depth = (recursion_depth < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_depth * COMPILER_STACK_FRAME_SCALE : recursion_depth;
state->recursion_limit = C_RECURSION_LIMIT * COMPILER_STACK_FRAME_SCALE;
int recursion_depth = C_RECURSION_LIMIT - tstate->c_recursion_remaining;
starting_recursion_depth = recursion_depth * COMPILER_STACK_FRAME_SCALE;
state->recursion_depth = starting_recursion_depth;
PyObject *result = ast2obj_mod(state, t);

9
Python/Python-ast.c generated
View File

@ -12315,7 +12315,6 @@ PyObject* PyAST_mod2obj(mod_ty t)
return NULL;
}
int recursion_limit = Py_GetRecursionLimit();
int starting_recursion_depth;
/* Be careful here to prevent overflow. */
int COMPILER_STACK_FRAME_SCALE = 3;
@ -12323,11 +12322,9 @@ PyObject* PyAST_mod2obj(mod_ty t)
if (!tstate) {
return 0;
}
state->recursion_limit = (recursion_limit < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_limit * COMPILER_STACK_FRAME_SCALE : recursion_limit;
int recursion_depth = tstate->recursion_limit - tstate->recursion_remaining;
starting_recursion_depth = (recursion_depth < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_depth * COMPILER_STACK_FRAME_SCALE : recursion_depth;
state->recursion_limit = C_RECURSION_LIMIT * COMPILER_STACK_FRAME_SCALE;
int recursion_depth = C_RECURSION_LIMIT - tstate->c_recursion_remaining;
starting_recursion_depth = recursion_depth * COMPILER_STACK_FRAME_SCALE;
state->recursion_depth = starting_recursion_depth;
PyObject *result = ast2obj_mod(state, t);

9
Python/ast.c
View File

@ -975,7 +975,6 @@ _PyAST_Validate(mod_ty mod)
int res = -1;
struct validator state;
PyThreadState *tstate;
int recursion_limit = Py_GetRecursionLimit();
int starting_recursion_depth;
/* Setup recursion depth check counters */
@ -984,12 +983,10 @@ _PyAST_Validate(mod_ty mod)
return 0;
}
/* Be careful here to prevent overflow. */
int recursion_depth = tstate->recursion_limit - tstate->recursion_remaining;
starting_recursion_depth = (recursion_depth< INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_depth * COMPILER_STACK_FRAME_SCALE : recursion_depth;
int recursion_depth = C_RECURSION_LIMIT - tstate->c_recursion_remaining;
starting_recursion_depth = recursion_depth * COMPILER_STACK_FRAME_SCALE;
state.recursion_depth = starting_recursion_depth;
state.recursion_limit = (recursion_limit < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_limit * COMPILER_STACK_FRAME_SCALE : recursion_limit;
state.recursion_limit = C_RECURSION_LIMIT * COMPILER_STACK_FRAME_SCALE;
switch (mod->kind) {
case Module_kind:

9
Python/ast_opt.c
View File

@ -1080,7 +1080,6 @@ int
_PyAST_Optimize(mod_ty mod, PyArena *arena, _PyASTOptimizeState *state)
{
PyThreadState *tstate;
int recursion_limit = Py_GetRecursionLimit();
int starting_recursion_depth;
/* Setup recursion depth check counters */
@ -1089,12 +1088,10 @@ _PyAST_Optimize(mod_ty mod, PyArena *arena, _PyASTOptimizeState *state)
return 0;
}
/* Be careful here to prevent overflow. */
int recursion_depth = tstate->recursion_limit - tstate->recursion_remaining;
starting_recursion_depth = (recursion_depth < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_depth * COMPILER_STACK_FRAME_SCALE : recursion_depth;
int recursion_depth = C_RECURSION_LIMIT - tstate->c_recursion_remaining;
starting_recursion_depth = recursion_depth * COMPILER_STACK_FRAME_SCALE;
state->recursion_depth = starting_recursion_depth;
state->recursion_limit = (recursion_limit < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_limit * COMPILER_STACK_FRAME_SCALE : recursion_limit;
state->recursion_limit = C_RECURSION_LIMIT * COMPILER_STACK_FRAME_SCALE;
int ret = astfold_mod(mod, arena, state);
assert(ret || PyErr_Occurred());

81
Python/ceval.c
View File

@ -257,9 +257,9 @@ Py_SetRecursionLimit(int new_limit)
PyInterpreterState *interp = _PyInterpreterState_GET();
interp->ceval.recursion_limit = new_limit;
for (PyThreadState *p = interp->threads.head; p != NULL; p = p->next) {
int depth = p->recursion_limit - p->recursion_remaining;
p->recursion_limit = new_limit;
p->recursion_remaining = new_limit - depth;
int depth = p->py_recursion_limit - p->py_recursion_remaining;
p->py_recursion_limit = new_limit;
p->py_recursion_remaining = new_limit - depth;
}
}
@ -268,35 +268,27 @@ Py_SetRecursionLimit(int new_limit)
int
_Py_CheckRecursiveCall(PyThreadState *tstate, const char *where)
{
/* Check against global limit first. */
int depth = tstate->recursion_limit - tstate->recursion_remaining;
if (depth < tstate->interp->ceval.recursion_limit) {
tstate->recursion_limit = tstate->interp->ceval.recursion_limit;
tstate->recursion_remaining = tstate->recursion_limit - depth;
assert(tstate->recursion_remaining > 0);
return 0;
}
#ifdef USE_STACKCHECK
if (PyOS_CheckStack()) {
++tstate->recursion_remaining;
++tstate->c_recursion_remaining;
_PyErr_SetString(tstate, PyExc_MemoryError, "Stack overflow");
return -1;
}
#endif
if (tstate->recursion_headroom) {
if (tstate->recursion_remaining < -50) {
if (tstate->c_recursion_remaining < -50) {
/* Overflowing while handling an overflow. Give up. */
Py_FatalError("Cannot recover from stack overflow.");
}
}
else {
if (tstate->recursion_remaining <= 0) {
if (tstate->c_recursion_remaining <= 0) {
tstate->recursion_headroom++;
_PyErr_Format(tstate, PyExc_RecursionError,
"maximum recursion depth exceeded%s",
where);
tstate->recursion_headroom--;
++tstate->recursion_remaining;
++tstate->c_recursion_remaining;
return -1;
}
}
@ -983,6 +975,39 @@ pop_frame(PyThreadState *tstate, _PyInterpreterFrame *frame)
return prev_frame;
}
int _Py_CheckRecursiveCallPy(
PyThreadState *tstate)
{
if (tstate->recursion_headroom) {
if (tstate->py_recursion_remaining < -50) {
/* Overflowing while handling an overflow. Give up. */
Py_FatalError("Cannot recover from Python stack overflow.");
}
}
else {
if (tstate->py_recursion_remaining <= 0) {
tstate->recursion_headroom++;
_PyErr_Format(tstate, PyExc_RecursionError,
"maximum recursion depth exceeded");
tstate->recursion_headroom--;
return -1;
}
}
return 0;
}
static inline int _Py_EnterRecursivePy(PyThreadState *tstate) {
return (tstate->py_recursion_remaining-- <= 0) &&
_Py_CheckRecursiveCallPy(tstate);
}
static inline void _Py_LeaveRecursiveCallPy(PyThreadState *tstate) {
tstate->py_recursion_remaining++;
}
/* It is only between the KW_NAMES instruction and the following CALL,
* that this has any meaning.
*/
@ -1037,10 +1062,15 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
frame->previous = prev_cframe->current_frame;
cframe.current_frame = frame;
if (_Py_EnterRecursiveCallTstate(tstate, "")) {
tstate->c_recursion_remaining--;
tstate->py_recursion_remaining--;
goto exit_unwind;
}
/* support for generator.throw() */
if (throwflag) {
if (_Py_EnterRecursiveCallTstate(tstate, "")) {
tstate->recursion_remaining--;
if (_Py_EnterRecursivePy(tstate)) {
goto exit_unwind;
}
TRACE_FUNCTION_THROW_ENTRY();
@ -1079,8 +1109,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
start_frame:
if (_Py_EnterRecursiveCallTstate(tstate, "")) {
tstate->recursion_remaining--;
if (_Py_EnterRecursivePy(tstate)) {
goto exit_unwind;
}
@ -1830,12 +1859,13 @@ handle_eval_breaker:
_PyFrame_SetStackPointer(frame, stack_pointer);
TRACE_FUNCTION_EXIT();
DTRACE_FUNCTION_EXIT();
_Py_LeaveRecursiveCallTstate(tstate);
_Py_LeaveRecursiveCallPy(tstate);
if (!frame->is_entry) {
frame = cframe.current_frame = pop_frame(tstate, frame);
_PyFrame_StackPush(frame, retval);
goto resume_frame;
}
_Py_LeaveRecursiveCallTstate(tstate);
/* Restore previous cframe and return. */
tstate->cframe = cframe.previous;
tstate->cframe->use_tracing = cframe.use_tracing;
@ -2046,6 +2076,7 @@ handle_eval_breaker:
_PyFrame_SetStackPointer(frame, stack_pointer);
TRACE_FUNCTION_EXIT();
DTRACE_FUNCTION_EXIT();
_Py_LeaveRecursiveCallPy(tstate);
_Py_LeaveRecursiveCallTstate(tstate);
/* Restore previous cframe and return. */
tstate->cframe = cframe.previous;
@ -4800,7 +4831,7 @@ handle_eval_breaker:
assert(frame->frame_obj == NULL);
gen->gi_frame_state = FRAME_CREATED;
gen_frame->owner = FRAME_OWNED_BY_GENERATOR;
_Py_LeaveRecursiveCallTstate(tstate);
_Py_LeaveRecursiveCallPy(tstate);
if (!frame->is_entry) {
_PyInterpreterFrame *prev = frame->previous;
_PyThreadState_PopFrame(tstate, frame);
@ -4808,6 +4839,7 @@ handle_eval_breaker:
_PyFrame_StackPush(frame, (PyObject *)gen);
goto resume_frame;
}
_Py_LeaveRecursiveCallTstate(tstate);
/* Make sure that frame is in a valid state */
frame->stacktop = 0;
frame->f_locals = NULL;
@ -5178,12 +5210,13 @@ exception_unwind:
exit_unwind:
assert(_PyErr_Occurred(tstate));
_Py_LeaveRecursiveCallTstate(tstate);
_Py_LeaveRecursiveCallPy(tstate);
if (frame->is_entry) {
/* Restore previous cframe and exit */
tstate->cframe = cframe.previous;
tstate->cframe->use_tracing = cframe.use_tracing;
assert(tstate->cframe->current_frame == frame->previous);
_Py_LeaveRecursiveCallTstate(tstate);
return NULL;
}
frame = cframe.current_frame = pop_frame(tstate, frame);
@ -5755,11 +5788,11 @@ _PyEvalFrameClearAndPop(PyThreadState *tstate, _PyInterpreterFrame * frame)
// _PyThreadState_PopFrame, since f_code is already cleared at that point:
assert((PyObject **)frame + frame->f_code->co_framesize ==
tstate->datastack_top);
tstate->recursion_remaining--;
tstate->c_recursion_remaining--;
assert(frame->frame_obj == NULL || frame->frame_obj->f_frame == frame);
assert(frame->owner == FRAME_OWNED_BY_THREAD);
_PyFrame_Clear(frame);
tstate->recursion_remaining++;
tstate->c_recursion_remaining++;
_PyThreadState_PopFrame(tstate, frame);
}

5
Python/pystate.c
View File

@ -792,8 +792,9 @@ init_threadstate(PyThreadState *tstate,
tstate->native_thread_id = PyThread_get_thread_native_id();
#endif
tstate->recursion_limit = interp->ceval.recursion_limit,
tstate->recursion_remaining = interp->ceval.recursion_limit,
tstate->py_recursion_limit = interp->ceval.recursion_limit,
tstate->py_recursion_remaining = interp->ceval.recursion_limit,
tstate->c_recursion_remaining = C_RECURSION_LIMIT;
tstate->exc_info = &tstate->exc_state;

9
Python/symtable.c
View File

@ -278,7 +278,6 @@ _PySymtable_Build(mod_ty mod, PyObject *filename, PyFutureFeatures *future)
asdl_stmt_seq *seq;
int i;
PyThreadState *tstate;
int recursion_limit = Py_GetRecursionLimit();
int starting_recursion_depth;
if (st == NULL)
@ -298,12 +297,10 @@ _PySymtable_Build(mod_ty mod, PyObject *filename, PyFutureFeatures *future)
return NULL;
}
/* Be careful here to prevent overflow. */
int recursion_depth = tstate->recursion_limit - tstate->recursion_remaining;
starting_recursion_depth = (recursion_depth < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_depth * COMPILER_STACK_FRAME_SCALE : recursion_depth;
int recursion_depth = C_RECURSION_LIMIT - tstate->c_recursion_remaining;
starting_recursion_depth = recursion_depth * COMPILER_STACK_FRAME_SCALE;
st->recursion_depth = starting_recursion_depth;
st->recursion_limit = (recursion_limit < INT_MAX / COMPILER_STACK_FRAME_SCALE) ?
recursion_limit * COMPILER_STACK_FRAME_SCALE : recursion_limit;
st->recursion_limit = C_RECURSION_LIMIT * COMPILER_STACK_FRAME_SCALE;
/* Make the initial symbol information gathering pass */
if (!symtable_enter_block(st, &_Py_ID(top), ModuleBlock, (void *)mod, 0, 0, 0, 0)) {

2
Python/sysmodule.c
View File

@ -1218,7 +1218,7 @@ sys_setrecursionlimit_impl(PyObject *module, int new_limit)
/* Reject too low new limit if the current recursion depth is higher than
the new low-water mark. */
int depth = tstate->recursion_limit - tstate->recursion_remaining;
int depth = tstate->py_recursion_limit - tstate->py_recursion_remaining;
if (depth >= new_limit) {
_PyErr_Format(tstate, PyExc_RecursionError,
"cannot set the recursion limit to %i at "