[python] Initial import of MicroPython 1.9.1

Change-Id: I1a8bafe720fb865f9418fc1e50de1184312e1653

python/src/py/stackctrl.c

@@ -0,0 +1,65 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Paul Sokolovsky
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/mpstate.h"
+#include "py/nlr.h"
+#include "py/obj.h"
+#include "py/runtime.h"
+#include "py/stackctrl.h"
+
+void mp_stack_ctrl_init(void) {
+    volatile int stack_dummy;
+    MP_STATE_THREAD(stack_top) = (char*)&stack_dummy;
+}
+
+void mp_stack_set_top(void *top) {
+    MP_STATE_THREAD(stack_top) = top;
+}
+
+mp_uint_t mp_stack_usage(void) {
+    // Assumes descending stack
+    volatile int stack_dummy;
+    return MP_STATE_THREAD(stack_top) - (char*)&stack_dummy;
+}
+
+#if MICROPY_STACK_CHECK
+
+void mp_stack_set_limit(mp_uint_t limit) {
+    MP_STATE_THREAD(stack_limit) = limit;
+}
+
+void mp_exc_recursion_depth(void) {
+    nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
+        MP_OBJ_NEW_QSTR(MP_QSTR_maximum_space_recursion_space_depth_space_exceeded)));
+}
+
+void mp_stack_check(void) {
+    if (mp_stack_usage() >= MP_STATE_THREAD(stack_limit)) {
+        mp_exc_recursion_depth();
+    }
+}
+
+#endif // MICROPY_STACK_CHECK