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bpo-45582: Port getpath[p].c to Python (GH-29041)

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The getpath.py file is frozen at build time and executed as code over a namespace. It is never imported, nor is it meant to be importable or reusable. However, it should be easier to read, modify, and patch than the previous code.

This commit attempts to preserve every previously tested quirk, but these may be changed in the future to better align platforms.
This commit is contained in:
Steve Dower 2021-12-03 00:08:42 +00:00 • committed by GitHub
parent 9f2f7e4226
commit 99fcf15052
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40 changed files with 3686 additions and 3838 deletions
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57
Python/dynload_win.c
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@ -2,6 +2,9 @@
/* Support for dynamic loading of extension modules */
#include "Python.h"
#include "pycore_fileutils.h" // _Py_add_relfile()
#include "pycore_pathconfig.h" // _PyPathConfig_ComputeSysPath0()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#ifdef HAVE_DIRECT_H
#include <direct.h>
@ -160,6 +163,60 @@ static char *GetPythonImport (HINSTANCE hModule)
return NULL;
}
/* Load python3.dll before loading any extension module that might refer
to it. That way, we can be sure that always the python3.dll corresponding
to this python DLL is loaded, not a python3.dll that might be on the path
by chance.
Return whether the DLL was found.
*/
extern HMODULE PyWin_DLLhModule;
static int
_Py_CheckPython3(void)
{
static int python3_checked = 0;
static HANDLE hPython3;
#define MAXPATHLEN 512
wchar_t py3path[MAXPATHLEN+1];
if (python3_checked) {
return hPython3 != NULL;
}
python3_checked = 1;
/* If there is a python3.dll next to the python3y.dll,
use that DLL */
if (PyWin_DLLhModule && GetModuleFileNameW(PyWin_DLLhModule, py3path, MAXPATHLEN)) {
wchar_t *p = wcsrchr(py3path, L'\\');
if (p) {
wcscpy(p + 1, PY3_DLLNAME);
hPython3 = LoadLibraryExW(py3path, NULL, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);
if (hPython3 != NULL) {
return 1;
}
}
}
/* If we can locate python3.dll in our application dir,
use that DLL */
hPython3 = LoadLibraryExW(PY3_DLLNAME, NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR);
if (hPython3 != NULL) {
return 1;
}
/* For back-compat, also search {sys.prefix}\DLLs, though
that has not been a normal install layout for a while */
PyInterpreterState *interp = _PyInterpreterState_GET();
PyConfig *config = (PyConfig*)_PyInterpreterState_GetConfig(interp);
assert(config->prefix);
if (config->prefix) {
wcscpy_s(py3path, MAXPATHLEN, config->prefix);
if (py3path[0] && _Py_add_relfile(py3path, L"DLLs\\" PY3_DLLNAME, MAXPATHLEN) >= 0) {
hPython3 = LoadLibraryExW(py3path, NULL, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);
}
}
return hPython3 != NULL;
#undef MAXPATHLEN
}
dl_funcptr _PyImport_FindSharedFuncptrWindows(const char *prefix,
const char *shortname,
PyObject *pathname, FILE *fp)