GH-91079: Implement C stack limits using addresses, not counters. (GH-130007)

* Implement C recursion protection with limit pointers

* Remove calls to PyOS_CheckStack

* Add stack protection to parser

* Make tests more robust to low stacks

* Improve error messages for stack overflow

1 files changed, 3 insertions, 24 deletions

diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 945e267..36390da 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1528,12 +1528,8 @@ _Py_SourceAsString(PyObject *cmd, const char *funcname, const char *what, PyComp
 }
 
 #if defined(USE_STACKCHECK)
-#if defined(WIN32) && defined(_MSC_VER)
 
-/* Stack checking for Microsoft C */
-
-#include <malloc.h>
-#include <excpt.h>
+/* Stack checking */
 
 /*
  * Return non-zero when we run out of memory on the stack; zero otherwise.
@@ -1541,27 +1537,10 @@ _Py_SourceAsString(PyObject *cmd, const char *funcname, const char *what, PyComp
 int
 PyOS_CheckStack(void)
 {
-    __try {
-        /* alloca throws a stack overflow exception if there's
-           not enough space left on the stack */
-        alloca(PYOS_STACK_MARGIN * sizeof(void*));
-        return 0;
-    } __except (GetExceptionCode() == STATUS_STACK_OVERFLOW ?
-                    EXCEPTION_EXECUTE_HANDLER :
-            EXCEPTION_CONTINUE_SEARCH) {
-        int errcode = _resetstkoflw();
-        if (errcode == 0)
-        {
-            Py_FatalError("Could not reset the stack!");
-        }
-    }
-    return 1;
+    PyThreadState *tstate = _PyThreadState_GET();
+    return _Py_ReachedRecursionLimit(tstate);
 }
 
-#endif /* WIN32 && _MSC_VER */
-
-/* Alternate implementations can be added here... */
-
 #endif /* USE_STACKCHECK */
 
 /* Deprecated C API functions still provided for binary compatibility */