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>
This commit is contained in:
shenlei
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/* Iterator objects */
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#include "Python.h"
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typedef struct {
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PyObject_HEAD
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long it_index;
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PyObject *it_seq; /* Set to NULL when iterator is exhausted */
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} seqiterobject;
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PyObject *
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PySeqIter_New(PyObject *seq)
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{
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seqiterobject *it;
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if (!PySequence_Check(seq)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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it = PyObject_GC_New(seqiterobject, &PySeqIter_Type);
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if (it == NULL)
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return NULL;
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it->it_index = 0;
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Py_INCREF(seq);
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it->it_seq = seq;
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_PyObject_GC_TRACK(it);
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return (PyObject *)it;
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}
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static void
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iter_dealloc(seqiterobject *it)
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{
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_PyObject_GC_UNTRACK(it);
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Py_XDECREF(it->it_seq);
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PyObject_GC_Del(it);
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}
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static int
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iter_traverse(seqiterobject *it, visitproc visit, void *arg)
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{
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Py_VISIT(it->it_seq);
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return 0;
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}
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static PyObject *
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iter_iternext(PyObject *iterator)
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{
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seqiterobject *it;
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PyObject *seq;
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PyObject *result;
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assert(PySeqIter_Check(iterator));
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it = (seqiterobject *)iterator;
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seq = it->it_seq;
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if (seq == NULL)
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return NULL;
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if (it->it_index == LONG_MAX) {
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PyErr_SetString(PyExc_OverflowError,
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"iter index too large");
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return NULL;
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}
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result = PySequence_GetItem(seq, it->it_index);
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if (result != NULL) {
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it->it_index++;
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return result;
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}
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if (PyErr_ExceptionMatches(PyExc_IndexError) ||
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PyErr_ExceptionMatches(PyExc_StopIteration))
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{
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PyErr_Clear();
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it->it_seq = NULL;
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Py_DECREF(seq);
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}
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return NULL;
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}
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static PyObject *
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iter_len(seqiterobject *it)
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{
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Py_ssize_t seqsize, len;
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if (it->it_seq) {
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seqsize = PySequence_Size(it->it_seq);
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if (seqsize == -1)
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return NULL;
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len = seqsize - it->it_index;
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if (len >= 0)
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return PyInt_FromSsize_t(len);
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}
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return PyInt_FromLong(0);
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}
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PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
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static PyMethodDef seqiter_methods[] = {
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{"__length_hint__", (PyCFunction)iter_len, METH_NOARGS, length_hint_doc},
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{NULL, NULL} /* sentinel */
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};
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PyTypeObject PySeqIter_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"iterator", /* tp_name */
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sizeof(seqiterobject), /* tp_basicsize */
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0, /* tp_itemsize */
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/* methods */
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(destructor)iter_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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0, /* tp_doc */
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(traverseproc)iter_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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PyObject_SelfIter, /* tp_iter */
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iter_iternext, /* tp_iternext */
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seqiter_methods, /* tp_methods */
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0, /* tp_members */
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};
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/* -------------------------------------- */
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typedef struct {
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PyObject_HEAD
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PyObject *it_callable; /* Set to NULL when iterator is exhausted */
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PyObject *it_sentinel; /* Set to NULL when iterator is exhausted */
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} calliterobject;
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PyObject *
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PyCallIter_New(PyObject *callable, PyObject *sentinel)
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{
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calliterobject *it;
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it = PyObject_GC_New(calliterobject, &PyCallIter_Type);
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if (it == NULL)
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return NULL;
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Py_INCREF(callable);
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it->it_callable = callable;
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Py_INCREF(sentinel);
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it->it_sentinel = sentinel;
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_PyObject_GC_TRACK(it);
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return (PyObject *)it;
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}
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static void
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calliter_dealloc(calliterobject *it)
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{
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_PyObject_GC_UNTRACK(it);
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Py_XDECREF(it->it_callable);
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Py_XDECREF(it->it_sentinel);
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PyObject_GC_Del(it);
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}
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static int
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calliter_traverse(calliterobject *it, visitproc visit, void *arg)
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{
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Py_VISIT(it->it_callable);
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Py_VISIT(it->it_sentinel);
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return 0;
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}
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static PyObject *
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calliter_iternext(calliterobject *it)
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{
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if (it->it_callable != NULL) {
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PyObject *args = PyTuple_New(0);
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PyObject *result;
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if (args == NULL)
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return NULL;
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result = PyObject_Call(it->it_callable, args, NULL);
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Py_DECREF(args);
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if (result != NULL) {
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int ok;
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ok = PyObject_RichCompareBool(result,
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it->it_sentinel,
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Py_EQ);
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if (ok == 0)
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return result; /* Common case, fast path */
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Py_DECREF(result);
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if (ok > 0) {
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Py_CLEAR(it->it_callable);
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Py_CLEAR(it->it_sentinel);
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}
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}
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else if (PyErr_ExceptionMatches(PyExc_StopIteration)) {
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PyErr_Clear();
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Py_CLEAR(it->it_callable);
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Py_CLEAR(it->it_sentinel);
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}
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}
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return NULL;
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}
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PyTypeObject PyCallIter_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"callable-iterator", /* tp_name */
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sizeof(calliterobject), /* tp_basicsize */
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0, /* tp_itemsize */
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/* methods */
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(destructor)calliter_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
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0, /* tp_doc */
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(traverseproc)calliter_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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PyObject_SelfIter, /* tp_iter */
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(iternextfunc)calliter_iternext, /* tp_iternext */
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0, /* tp_methods */
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};
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