181 lines
6.0 KiB
C
181 lines
6.0 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2013, 2014 Damien P. George
|
|
*
|
|
* 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_AARCH64 (13)
|
|
#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(__aarch64__)
|
|
#define MICROPY_NLR_AARCH64 (1)
|
|
#define MICROPY_NLR_NUM_REGS (MICROPY_NLR_NUM_REGS_AARCH64)
|
|
#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
|
|
#include <setjmp.h>
|
|
#endif
|
|
|
|
typedef struct _nlr_buf_t nlr_buf_t;
|
|
struct _nlr_buf_t {
|
|
// the entries here must all be machine word size
|
|
nlr_buf_t *prev;
|
|
void *ret_val; // always a concrete object (an exception instance)
|
|
|
|
#if MICROPY_NLR_SETJMP
|
|
jmp_buf jmpbuf;
|
|
#else
|
|
void *regs[MICROPY_NLR_NUM_REGS];
|
|
#endif
|
|
|
|
#if MICROPY_ENABLE_PYSTACK
|
|
void *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))
|
|
#else
|
|
unsigned int nlr_push(nlr_buf_t *);
|
|
#endif
|
|
|
|
unsigned 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
|