circuitpython/py/bc.h

168 lines
6.1 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* 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.
*/
#ifndef MICROPY_INCLUDED_PY_BC_H
#define MICROPY_INCLUDED_PY_BC_H
#include "py/runtime.h"
#include "py/objfun.h"
// bytecode layout:
//
// n_state : var uint
// n_exc_stack : var uint
// scope_flags : byte
// n_pos_args : byte number of arguments this function takes
// n_kwonly_args : byte number of keyword-only arguments this function takes
// n_def_pos_args : byte number of default positional arguments
//
// code_info_size : var uint | code_info_size counts bytes in this chunk
// simple_name : var qstr |
// source_file : var qstr |
// <line number info> |
// <word alignment padding> | only needed if bytecode contains pointers
//
// local_num0 : byte |
// ... : byte |
// local_numN : byte | N = num_cells
// 255 : byte | end of list sentinel
// <bytecode> |
//
//
// constant table layout:
//
// argname0 : obj (qstr)
// ... : obj (qstr)
// argnameN : obj (qstr) N = num_pos_args + num_kwonly_args
// const0 : obj
// constN : obj
typedef struct _mp_bytecode_prelude_t {
uint n_state;
uint n_exc_stack;
uint scope_flags;
uint n_pos_args;
uint n_kwonly_args;
uint n_def_pos_args;
qstr qstr_block_name;
qstr qstr_source_file;
const byte *line_info;
const byte *locals;
const byte *opcodes;
} mp_bytecode_prelude_t;
// Exception stack entry
typedef struct _mp_exc_stack_t {
const byte *handler;
// bit 0 is saved currently_in_except_block value
// bit 1 is whether the opcode was SETUP_WITH or SETUP_FINALLY
mp_obj_t *val_sp;
// Saved exception, valid if currently_in_except_block bit is 1
mp_obj_base_t *prev_exc;
} mp_exc_stack_t;
typedef struct _mp_code_state_t {
// The fun_bc entry points to the underlying function object that is being executed.
// It is needed to access the start of bytecode and the const_table.
// It is also needed to prevent the GC from reclaiming the bytecode during execution,
// because the ip pointer below will always point to the interior of the bytecode.
mp_obj_fun_bc_t *fun_bc;
const byte *ip;
mp_obj_t *sp;
// bit 0 is saved currently_in_except_block value
mp_exc_stack_t *exc_sp;
mp_obj_dict_t *old_globals;
#if MICROPY_STACKLESS
struct _mp_code_state_t *prev;
#endif
#if MICROPY_PY_SYS_SETTRACE
struct _mp_code_state_t *prev_state;
struct _mp_obj_frame_t *frame;
#endif
// Variable-length
mp_obj_t state[0];
// Variable-length, never accessed by name, only as (void*)(state + n_state)
//mp_exc_stack_t exc_state[0];
} mp_code_state_t;
mp_uint_t mp_decode_uint(const byte **ptr);
mp_uint_t mp_decode_uint_value(const byte *ptr);
const byte *mp_decode_uint_skip(const byte *ptr);
mp_vm_return_kind_t mp_execute_bytecode(mp_code_state_t *code_state, volatile mp_obj_t inject_exc);
mp_code_state_t *mp_obj_fun_bc_prepare_codestate(mp_obj_t func, size_t n_args, size_t n_kw, const mp_obj_t *args);
void mp_setup_code_state(mp_code_state_t *code_state, size_t n_args, size_t n_kw, const mp_obj_t *args);
void mp_bytecode_print(const void *descr, const byte *code, mp_uint_t len, const mp_uint_t *const_table);
void mp_bytecode_print2(const byte *code, size_t len, const mp_uint_t *const_table);
const byte *mp_bytecode_print_str(const byte *ip);
#define mp_bytecode_print_inst(code, const_table) mp_bytecode_print2(code, 1, const_table)
// Helper macros to access pointer with least significant bits holding flags
#define MP_TAGPTR_PTR(x) ((void*)((uintptr_t)(x) & ~((uintptr_t)3)))
#define MP_TAGPTR_TAG0(x) ((uintptr_t)(x) & 1)
#define MP_TAGPTR_TAG1(x) ((uintptr_t)(x) & 2)
#define MP_TAGPTR_MAKE(ptr, tag) ((void*)((uintptr_t)(ptr) | (tag)))
#if MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE
#define MP_OPCODE_BYTE (0)
#define MP_OPCODE_QSTR (1)
#define MP_OPCODE_VAR_UINT (2)
#define MP_OPCODE_OFFSET (3)
uint mp_opcode_format(const byte *ip, size_t *opcode_size, bool count_var_uint);
#endif
static inline size_t mp_bytecode_get_source_line(const byte *line_info, size_t bc_offset) {
size_t source_line = 1;
size_t c;
while ((c = *line_info)) {
size_t b, l;
if ((c & 0x80) == 0) {
// 0b0LLBBBBB encoding
b = c & 0x1f;
l = c >> 5;
line_info += 1;
} else {
// 0b1LLLBBBB 0bLLLLLLLL encoding (l's LSB in second byte)
b = c & 0xf;
l = ((c << 4) & 0x700) | line_info[1];
line_info += 2;
}
if (bc_offset >= b) {
bc_offset -= b;
source_line += l;
} else {
// found source line corresponding to bytecode offset
break;
}
}
return source_line;
}
#endif // MICROPY_INCLUDED_PY_BC_H