gh-106320: Remove private _PyMem API (#107187)

Move private _PyMem functions to the internal C API (pycore_pymem.h):

* _PyMem_GetCurrentAllocatorName()
* _PyMem_RawStrdup()
* _PyMem_RawWcsdup()
* _PyMem_Strdup()

No longer export these functions.

Move pymem_getallocatorsname() function from _testcapi to _testinternalcapi,
since the API moved to the internal C API.

Include/cpython/pymem.h

@@ -7,18 +7,6 @@ PyAPI_FUNC(void *) PyMem_RawCalloc(size_t nelem, size_t elsize);
 PyAPI_FUNC(void *) PyMem_RawRealloc(void *ptr, size_t new_size);
 PyAPI_FUNC(void) PyMem_RawFree(void *ptr);
 
-/* Try to get the allocators name set by _PyMem_SetupAllocators(). */
-PyAPI_FUNC(const char*) _PyMem_GetCurrentAllocatorName(void);
-
-/* strdup() using PyMem_RawMalloc() */
-PyAPI_FUNC(char *) _PyMem_RawStrdup(const char *str);
-
-/* strdup() using PyMem_Malloc() */
-PyAPI_FUNC(char *) _PyMem_Strdup(const char *str);
-
-/* wcsdup() using PyMem_RawMalloc() */
-PyAPI_FUNC(wchar_t*) _PyMem_RawWcsdup(const wchar_t *str);
-
 
 typedef enum {
     /* PyMem_RawMalloc(), PyMem_RawRealloc() and PyMem_RawFree() */

Include/internal/pycore_pymem.h

@@ -8,8 +8,20 @@ extern "C" {
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
-#include "pymem.h"      // PyMemAllocatorName
+// Try to get the allocators name set by _PyMem_SetupAllocators().
+// Return NULL if unknown.
+// Export for shared _testinternalcapi extension.
+PyAPI_FUNC(const char*) _PyMem_GetCurrentAllocatorName(void);
 
+// strdup() using PyMem_RawMalloc()
+extern char* _PyMem_RawStrdup(const char *str);
+
+// strdup() using PyMem_Malloc().
+// Export for shared _pickle extension.
+PyAPI_FUNC(char*) _PyMem_Strdup(const char *str);
+
+// wcsdup() using PyMem_RawMalloc()
+extern wchar_t* _PyMem_RawWcsdup(const wchar_t *str);
 
 typedef struct {
     /* We tag each block with an API ID in order to tag API violations */

Lib/test/pythoninfo.py

@@ -637,11 +637,11 @@ def collect_decimal(info_add):
 
 def collect_testcapi(info_add):
     try:
-        import _testcapi
+        import _testinternalcapi
     except ImportError:
         return
 
-    call_func(info_add, 'pymem.allocator', _testcapi, 'pymem_getallocatorsname')
+    call_func(info_add, 'pymem.allocator', _testinternalcapi, 'pymem_getallocatorsname')
 
 
 def collect_resource(info_add):

Lib/test/test_cmd_line.py

@@ -717,11 +717,11 @@ class CmdLineTest(unittest.TestCase):
 
         # Memory allocator debug hooks
         try:
-            import _testcapi
+            import _testinternalcapi
         except ImportError:
             pass
         else:
-            code = "import _testcapi; print(_testcapi.pymem_getallocatorsname())"
+            code = "import _testinternalcapi; print(_testinternalcapi.pymem_getallocatorsname())"
             with support.SuppressCrashReport():
                 out = self.run_xdev("-c", code, check_exitcode=False)
             if support.with_pymalloc():
@@ -783,7 +783,7 @@ class CmdLineTest(unittest.TestCase):
         self.assertEqual(out, expected_filters)
 
     def check_pythonmalloc(self, env_var, name):
-        code = 'import _testcapi; print(_testcapi.pymem_getallocatorsname())'
+        code = 'import _testinternalcapi; print(_testinternalcapi.pymem_getallocatorsname())'
         env = dict(os.environ)
         env.pop('PYTHONDEVMODE', None)
         if env_var is not None:

Lib/test/test_sys.py

@@ -960,12 +960,12 @@ class SysModuleTest(unittest.TestCase):
                          "sys.getallocatedblocks unavailable on this build")
     def test_getallocatedblocks(self):
         try:
-            import _testcapi
+            import _testinternalcapi
         except ImportError:
             with_pymalloc = support.with_pymalloc()
         else:
             try:
-                alloc_name = _testcapi.pymem_getallocatorsname()
+                alloc_name = _testinternalcapi.pymem_getallocatorsname()
             except RuntimeError as exc:
                 # "cannot get allocators name" (ex: tracemalloc is used)
                 with_pymalloc = True

Modules/_testcapi/mem.c

@@ -440,17 +440,6 @@ test_pymem_alloc0(PyObject *self, PyObject *Py_UNUSED(ignored))
     Py_RETURN_NONE;
 }
 
-static PyObject *
-test_pymem_getallocatorsname(PyObject *self, PyObject *args)
-{
-    const char *name = _PyMem_GetCurrentAllocatorName();
-    if (name == NULL) {
-        PyErr_SetString(PyExc_RuntimeError, "cannot get allocators name");
-        return NULL;
-    }
-    return PyUnicode_FromString(name);
-}
-
 static PyObject *
 test_pymem_setrawallocators(PyObject *self, PyObject *Py_UNUSED(ignored))
 {
@@ -589,7 +578,6 @@ tracemalloc_untrack(PyObject *self, PyObject *args)
 static PyMethodDef test_methods[] = {
     {"pymem_api_misuse",              pymem_api_misuse,              METH_NOARGS},
     {"pymem_buffer_overflow",         pymem_buffer_overflow,         METH_NOARGS},
-    {"pymem_getallocatorsname",       test_pymem_getallocatorsname,  METH_NOARGS},
     {"pymem_malloc_without_gil",      pymem_malloc_without_gil,      METH_NOARGS},
     {"pyobject_malloc_without_gil",   pyobject_malloc_without_gil,   METH_NOARGS},
     {"remove_mem_hooks",              remove_mem_hooks,              METH_NOARGS,

Modules/_testinternalcapi.c

@@ -1519,6 +1519,18 @@ check_pyobject_freed_is_freed(PyObject *self, PyObject *Py_UNUSED(args))
 }
 
 
+static PyObject *
+test_pymem_getallocatorsname(PyObject *self, PyObject *args)
+{
+    const char *name = _PyMem_GetCurrentAllocatorName();
+    if (name == NULL) {
+        PyErr_SetString(PyExc_RuntimeError, "cannot get allocators name");
+        return NULL;
+    }
+    return PyUnicode_FromString(name);
+}
+
+
 static PyMethodDef module_functions[] = {
     {"get_configs", get_configs, METH_NOARGS},
     {"get_recursion_depth", get_recursion_depth, METH_NOARGS},
@@ -1581,6 +1593,7 @@ static PyMethodDef module_functions[] = {
     {"check_pyobject_null_is_freed",  check_pyobject_null_is_freed,  METH_NOARGS},
     {"check_pyobject_uninitialized_is_freed",
                               check_pyobject_uninitialized_is_freed, METH_NOARGS},
+    {"pymem_getallocatorsname", test_pymem_getallocatorsname, METH_NOARGS},
     {NULL, NULL} /* sentinel */
 };
 

Modules/getpath.c

@@ -1,11 +1,13 @@
 /* Return the initial module search path. */
 
 #include "Python.h"
+#include "pycore_fileutils.h"     // _Py_abspath()
+#include "pycore_initconfig.h"    // _PyStatus_EXCEPTION()
+#include "pycore_pathconfig.h"    // _PyPathConfig_ReadGlobal()
+#include "pycore_pymem.h"         // _PyMem_RawWcsdup()
+
 #include "marshal.h"              // PyMarshal_ReadObjectFromString
 #include "osdefs.h"               // DELIM
-#include "pycore_initconfig.h"
-#include "pycore_fileutils.h"
-#include "pycore_pathconfig.h"
 #include <wchar.h>
 
 #ifdef MS_WINDOWS