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/*
* 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) {
/* Micropython's stackctrl.c assumes that the stack is in descending order,
* which is not always the case for us. */
volatile int stack_dummy;
if (MP_STATE_THREAD(stack_top) > (char*)&stack_dummy) {
return MP_STATE_THREAD(stack_top) - (char*)&stack_dummy;
} else {
return (char*)&stack_dummy - MP_STATE_THREAD(stack_top);
}
}
#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
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