bpo-32030: Enhance Py_Main() (#4412)

Parse more env vars in Py_Main():

* Add more options to _PyCoreConfig:

  * faulthandler
  * tracemalloc
  * importtime

* Move code to parse environment variables from _Py_InitializeCore()
  to Py_Main(). This change fixes a regression from Python 3.6:
  PYTHONUNBUFFERED is now read before calling pymain_init_stdio().
* _PyFaulthandler_Init() and _PyTraceMalloc_Init() now take an
  argument to decide if the module has to be enabled at startup.
* tracemalloc_start() is now responsible to check the maximum number
  of frames.

Other changes:

* Cleanup Py_Main():

  * Rename some pymain_xxx() subfunctions
  * Add pymain_run_python() subfunction

* Cleanup Py_NewInterpreter()
* _PyInterpreterState_Enable() now reports failure
* init_hash_secret() now considers pyurandom() failure as an "user
  error": don't fail with abort().
* pymain_optlist_append() and pymain_strdup() now sets err on memory
  allocation failure.

1 files changed, 4 insertions, 4 deletions

diff --git a/Modules/clinic/_tracemalloc.c.h b/Modules/clinic/_tracemalloc.c.h
index df7b750..206dea7 100644
--- a/Modules/clinic/_tracemalloc.c.h
+++ b/Modules/clinic/_tracemalloc.c.h
@@ -87,15 +87,15 @@ PyDoc_STRVAR(_tracemalloc_start__doc__,
     {"start", (PyCFunction)_tracemalloc_start, METH_FASTCALL, _tracemalloc_start__doc__},
 
 static PyObject *
-_tracemalloc_start_impl(PyObject *module, Py_ssize_t nframe);
+_tracemalloc_start_impl(PyObject *module, int nframe);
 
 static PyObject *
 _tracemalloc_start(PyObject *module, PyObject **args, Py_ssize_t nargs)
 {
     PyObject *return_value = NULL;
-    Py_ssize_t nframe = 1;
+    int nframe = 1;
 
-    if (!_PyArg_ParseStack(args, nargs, "|n:start",
+    if (!_PyArg_ParseStack(args, nargs, "|i:start",
         &nframe)) {
         goto exit;
     }
@@ -185,4 +185,4 @@ _tracemalloc_get_traced_memory(PyObject *module, PyObject *Py_UNUSED(ignored))
 {
     return _tracemalloc_get_traced_memory_impl(module);
 }
-/*[clinic end generated code: output=c9a0111391b3ec45 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=db4f909464c186e2 input=a9049054013a1b77]*/