130 lines
4.1 KiB
C
130 lines
4.1 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) 2013, 2014 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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#ifndef MICROPY_INCLUDED_PY_NLR_H
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#define MICROPY_INCLUDED_PY_NLR_H
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// non-local return
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// exception handling, basically a stack of setjmp/longjmp buffers
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#include <limits.h>
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#include <assert.h>
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#include "py/mpconfig.h"
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// If MICROPY_NLR_SETJMP is not enabled then auto-detect the machine arch
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// Allow a port to set MICROPY_NLR_NUM_REGS to define their own implementation
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#if !MICROPY_NLR_SETJMP && !defined(MICROPY_NLR_NUM_REGS)
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#if defined(__i386__)
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#define MICROPY_NLR_X86 (1)
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#define MICROPY_NLR_NUM_REGS (6)
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#elif defined(__x86_64__)
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#define MICROPY_NLR_X64 (1)
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#if defined(__CYGWIN__)
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#define MICROPY_NLR_NUM_REGS (12)
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#else
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#define MICROPY_NLR_NUM_REGS (8)
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#endif
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#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__)
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#define MICROPY_NLR_THUMB (1)
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#define MICROPY_NLR_NUM_REGS (10)
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#elif defined(__xtensa__)
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#define MICROPY_NLR_XTENSA (1)
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#define MICROPY_NLR_NUM_REGS (10)
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#else
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#define MICROPY_NLR_SETJMP (1)
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//#warning "No native NLR support for this arch, using setjmp implementation"
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#endif
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#endif
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#if MICROPY_NLR_SETJMP
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#include <setjmp.h>
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#endif
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typedef struct _nlr_buf_t nlr_buf_t;
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struct _nlr_buf_t {
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// the entries here must all be machine word size
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nlr_buf_t *prev;
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void *ret_val; // always a concrete object (an exception instance)
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#if MICROPY_NLR_SETJMP
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jmp_buf jmpbuf;
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#else
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void *regs[MICROPY_NLR_NUM_REGS];
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#endif
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#if MICROPY_ENABLE_PYSTACK
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void *pystack;
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#endif
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};
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#if MICROPY_NLR_SETJMP
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// nlr_push() must be defined as a macro, because "The stack context will be
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// invalidated if the function which called setjmp() returns."
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// For this case it is safe to call nlr_push_tail() first.
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#define nlr_push(buf) (nlr_push_tail(buf), setjmp((buf)->jmpbuf))
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#else
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unsigned int nlr_push(nlr_buf_t *);
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#endif
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unsigned int nlr_push_tail(nlr_buf_t *top);
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void nlr_pop(void);
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NORETURN void nlr_jump(void *val);
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NORETURN void nlr_jump_tail(nlr_buf_t *top);
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// This must be implemented by a port. It's called by nlr_jump
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// if no nlr buf has been pushed. It must not return, but rather
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// should bail out with a fatal error.
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NORETURN void nlr_jump_fail(void *val);
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// use nlr_raise instead of nlr_jump so that debugging is easier
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#ifndef MICROPY_DEBUG_NLR
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#define nlr_raise(val) nlr_jump(MP_OBJ_TO_PTR(val))
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#else
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#include "mpstate.h"
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#define nlr_raise(val) \
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do { \
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/*printf("nlr_raise: nlr_top=%p\n", MP_STATE_THREAD(nlr_top)); \
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fflush(stdout);*/ \
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void *_val = MP_OBJ_TO_PTR(val); \
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assert(_val != NULL); \
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assert(mp_obj_is_exception_instance(val)); \
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nlr_jump(_val); \
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} while (0)
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#if !MICROPY_NLR_SETJMP
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#define nlr_push(val) \
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assert(MP_STATE_THREAD(nlr_top) != val),nlr_push(val)
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/*
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#define nlr_push(val) \
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printf("nlr_push: before: nlr_top=%p, val=%p\n", MP_STATE_THREAD(nlr_top), val),assert(MP_STATE_THREAD(nlr_top) != val),nlr_push(val)
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*/
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#endif
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#endif
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#endif // MICROPY_INCLUDED_PY_NLR_H
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