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7b2a9b059a
Using the message "maximum recursion depth exceeded" for when the pystack runs out of memory can be misleading because the pystack can run out for reasons other than deep recursion (although in most cases pystack exhaustion is probably indirectly related to deep recursion). And it's important to give the user more precise feedback as to the reason for the error: if they know precisely that the pystack was exhausted then they have a chance to increase the amount of memory available to the pystack (as opposed to not knowing if it was the C stack or pystack that ran out). Also, C stack exhaustion is more serious than pystack exhaustion because it could have been that the C stack overflowed and overwrote/corrupted some data and so the system must be restarted. The pystack can never corrupt data in this way so pystack exhaustion does not require a system restart. Knowing the difference between these two cases is therefore important. The actual exception type for pystack exhaustion remains as RuntimeError so that programatically it behaves the same as a C stack exhaustion.
58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include "py/runtime.h"
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#if MICROPY_ENABLE_PYSTACK
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void mp_pystack_init(void *start, void *end) {
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MP_STATE_THREAD(pystack_start) = start;
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MP_STATE_THREAD(pystack_end) = end;
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MP_STATE_THREAD(pystack_cur) = start;
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}
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void *mp_pystack_alloc(size_t n_bytes) {
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n_bytes = (n_bytes + (MICROPY_PYSTACK_ALIGN - 1)) & ~(MICROPY_PYSTACK_ALIGN - 1);
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#if MP_PYSTACK_DEBUG
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n_bytes += MICROPY_PYSTACK_ALIGN;
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#endif
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if (MP_STATE_THREAD(pystack_cur) + n_bytes > MP_STATE_THREAD(pystack_end)) {
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// out of memory in the pystack
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nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
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MP_OBJ_NEW_QSTR(MP_QSTR_pystack_space_exhausted)));
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}
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void *ptr = MP_STATE_THREAD(pystack_cur);
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MP_STATE_THREAD(pystack_cur) += n_bytes;
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#if MP_PYSTACK_DEBUG
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*(size_t*)(MP_STATE_THREAD(pystack_cur) - MICROPY_PYSTACK_ALIGN) = n_bytes;
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#endif
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return ptr;
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}
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#endif
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