/** This file is part of the MicroPython project, http://micropython.org/** The MIT License (MIT)** Copyright (c) 2013, 2014 Damien P. George* Copyright (c) Quectel Wireless Solution, Co., Ltd.All Rights Reserved.** 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.*/#ifndef MICROPY_INCLUDED_PY_NLR_H#define MICROPY_INCLUDED_PY_NLR_H// non-local return// exception handling, basically a stack of setjmp/longjmp buffers#include <limits.h>#include <assert.h>#include "py/mpconfig.h"#define MICROPY_NLR_NUM_REGS_X86 (6)#define MICROPY_NLR_NUM_REGS_X64 (8)#define MICROPY_NLR_NUM_REGS_X64_WIN (10)#define MICROPY_NLR_NUM_REGS_ARM_THUMB (10)#define MICROPY_NLR_NUM_REGS_ARM_THUMB_FP (10 + 6)#define MICROPY_NLR_NUM_REGS_XTENSA (10)#define MICROPY_NLR_NUM_REGS_XTENSAWIN (17)// *FORMAT-OFF*// If MICROPY_NLR_SETJMP is not enabled then auto-detect the machine arch#if !MICROPY_NLR_SETJMP// A lot of nlr-related things need different treatment on Windows#if defined(_WIN32) || defined(__CYGWIN__)#define MICROPY_NLR_OS_WINDOWS 1#else#define MICROPY_NLR_OS_WINDOWS 0#endif#if defined(__i386__)#define MICROPY_NLR_X86 (1)#define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_X86)#elif defined(__x86_64__)#define MICROPY_NLR_X64 (1)#if MICROPY_NLR_OS_WINDOWS#define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_X64_WIN)#else#define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_X64)#endif#elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__)#define MICROPY_NLR_THUMB (1)#if defined(__SOFTFP__)#define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_ARM_THUMB)#else// With hardware FP registers s16-s31 are callee save so in principle// should be saved and restored by the NLR code. gcc only uses s16-s21// so only save/restore those as an optimisation.#define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_ARM_THUMB_FP)#endif#elif defined(__xtensa__)#define MICROPY_NLR_XTENSA (1)#define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_XTENSA)#elif defined(__powerpc__)#define MICROPY_NLR_POWERPC (1)// this could be less but using 128 for safety#define MICROPY_NLR_NUM_REGS (128)#else#define MICROPY_NLR_SETJMP (1)//#warning "No native NLR support for this arch, using setjmp implementation"#endif#endif// *FORMAT-ON*#if MICROPY_NLR_SETJMP#if defined(PLAT_RDA)typedef int jmp_buf[22];extern int setjmp(jmp_buf environment);extern void longjmp(jmp_buf environment, int value) __attribute__ ((__noreturn__));#else#include <setjmp.h>#endif#endiftypedef struct _nlr_buf_t nlr_buf_t;struct _nlr_buf_t {// the entries here must all be machine word sizenlr_buf_t *prev;void *ret_val; // always a concrete object (an exception instance)#if MICROPY_NLR_SETJMPjmp_buf jmpbuf;#elsevoid *regs[MICROPY_NLR_NUM_REGS];#endif#if MICROPY_ENABLE_PYSTACKvoid *pystack;#endif};// Helper macros to save/restore the pystack state#if MICROPY_ENABLE_PYSTACK#define MP_NLR_SAVE_PYSTACK(nlr_buf) (nlr_buf)->pystack = MP_STATE_THREAD(pystack_cur)#define MP_NLR_RESTORE_PYSTACK(nlr_buf) MP_STATE_THREAD(pystack_cur) = (nlr_buf)->pystack#else#define MP_NLR_SAVE_PYSTACK(nlr_buf) (void)nlr_buf#define MP_NLR_RESTORE_PYSTACK(nlr_buf) (void)nlr_buf#endif// Helper macro to use at the start of a specific nlr_jump implementation#define MP_NLR_JUMP_HEAD(val, top) \nlr_buf_t **_top_ptr = &MP_STATE_THREAD(nlr_top); \nlr_buf_t *top = *_top_ptr; \if (top == NULL) { \nlr_jump_fail(val); \} \top->ret_val = val; \MP_NLR_RESTORE_PYSTACK(top); \*_top_ptr = top->prev; \#if MICROPY_NLR_SETJMP// nlr_push() must be defined as a macro, because "The stack context will be// invalidated if the function which called setjmp() returns."// For this case it is safe to call nlr_push_tail() first.#define nlr_push(buf) (nlr_push_tail(buf), setjmp((buf)->jmpbuf))#elseunsigned int nlr_push(nlr_buf_t *);#endifunsigned int nlr_push_tail(nlr_buf_t *top);void nlr_pop(void);NORETURN void nlr_jump(void *val);// This must be implemented by a port. It's called by nlr_jump// if no nlr buf has been pushed. It must not return, but rather// should bail out with a fatal error.NORETURN void nlr_jump_fail(void *val);// use nlr_raise instead of nlr_jump so that debugging is easier#ifndef MICROPY_DEBUG_NLR#define nlr_raise(val) nlr_jump(MP_OBJ_TO_PTR(val))#else#include "mpstate.h"#define nlr_raise(val) \do { \/*printf("nlr_raise: nlr_top=%p\n", MP_STATE_THREAD(nlr_top)); \fflush(stdout);*/ \void *_val = MP_OBJ_TO_PTR(val); \assert(_val != NULL); \assert(mp_obj_is_exception_instance(val)); \nlr_jump(_val); \} while (0)#if !MICROPY_NLR_SETJMP#define nlr_push(val) \assert(MP_STATE_THREAD(nlr_top) != val),nlr_push(val)/*#define nlr_push(val) \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)*/#endif#endif#endif // MICROPY_INCLUDED_PY_NLR_H
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