port 2P step 1: vendor CPython 2.7.18 as the mtpython static library

The embedded 40250 script layer needs its own interpreter on five platforms. 2.7 is end-of-life, so nothing can be fetched from the target SDKs and the source is vendored (official 2.7.18 tarball, trimmed to 25MB; Lib/ stays for step 3's python27.zip). cpython-2.7.18/CMakeLists.txt builds one `mtpython` static library from exactly the 133 objects the reference libpython2.7.a contains, off by default behind -DMTGODOT_EMBED_PYTHON=ON. The source list and the built-in module table (config/config.c, 39 entries) are shared; pyconfig.h is a probe result and is not, so each platform keeps its own under config/<platform>/, regenerated by tools/py_embed/gen_pyconfig.sh and checked against the shared table. Three vendor patches, documented in docs/THIRD-PARTY.md: configure/configure.ac learn arm64 on macOS, and posixmodule.c undefines the process-control calls it hard-defines past pyconfig.h when building for iOS. macOS (ctest python.embed: every builtin imports, codecs and pickle work off the vendored Lib/), Android arm64 and iOS arm64 build. Linux needs a Linux host and Windows needs a MinGW-vs-MSVC decision; both are noted for step 4. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-23 08:27:35 +09:00
parent a9b31dec67
commit 5fad769ee8
1018 changed files with 652582 additions and 19 deletions
@@ -0,0 +1,86 @@
+/********************************************************************
+
+ import_nt.c
+
+  Win32 specific import code.
+
+*/
+
+#include "Python.h"
+#include "osdefs.h"
+#include <windows.h>
+#include "importdl.h"
+#include "malloc.h" /* for alloca */
+
+/* a string loaded from the DLL at startup */
+extern const char *PyWin_DLLVersionString;
+
+FILE *PyWin_FindRegisteredModule(const char *moduleName,
+                                 struct filedescr **ppFileDesc,
+                                 char *pathBuf,
+                                 Py_ssize_t pathLen)
+{
+    char *moduleKey;
+    const char keyPrefix[] = "Software\\Python\\PythonCore\\";
+    const char keySuffix[] = "\\Modules\\";
+#ifdef _DEBUG
+    /* In debugging builds, we _must_ have the debug version
+     * registered.
+     */
+    const char debugString[] = "\\Debug";
+#else
+    const char debugString[] = "";
+#endif
+    struct filedescr *fdp = NULL;
+    FILE *fp;
+    HKEY keyBase = HKEY_CURRENT_USER;
+    int modNameSize;
+    long regStat;
+
+    /* Calculate the size for the sprintf buffer.
+     * Get the size of the chars only, plus 1 NULL.
+     */
+    size_t bufSize = sizeof(keyPrefix)-1 +
+                     strlen(PyWin_DLLVersionString) +
+                     sizeof(keySuffix) +
+                     strlen(moduleName) +
+                     sizeof(debugString) - 1;
+    /* alloca == no free required, but memory only local to fn,
+     * also no heap fragmentation!
+     */
+    moduleKey = alloca(bufSize);
+    PyOS_snprintf(moduleKey, bufSize,
+                  "Software\\Python\\PythonCore\\%s\\Modules\\%s%s",
+                  PyWin_DLLVersionString, moduleName, debugString);
+
+    assert(pathLen < INT_MAX);
+    modNameSize = (int)pathLen;
+    regStat = RegQueryValue(keyBase, moduleKey, pathBuf, &modNameSize);
+    if (regStat != ERROR_SUCCESS) {
+        /* No user setting - lookup in machine settings */
+        keyBase = HKEY_LOCAL_MACHINE;
+        /* be anal - failure may have reset size param */
+        modNameSize = (int)pathLen;
+        regStat = RegQueryValue(keyBase, moduleKey,
+                                pathBuf, &modNameSize);
+
+        if (regStat != ERROR_SUCCESS)
+            return NULL;
+    }
+    /* use the file extension to locate the type entry. */
+    for (fdp = _PyImport_Filetab; fdp->suffix != NULL; fdp++) {
+        size_t extLen = strlen(fdp->suffix);
+        assert(modNameSize >= 0); /* else cast to size_t is wrong */
+        if ((size_t)modNameSize > extLen &&
+            strnicmp(pathBuf + ((size_t)modNameSize-extLen-1),
+                     fdp->suffix,
+                     extLen) == 0)
+            break;
+    }
+    if (fdp->suffix == NULL)
+        return NULL;
+    fp = fopen(pathBuf, fdp->mode);
+    if (fp != NULL)
+        *ppFileDesc = fdp;
+    return fp;
+}