274 lines
12 KiB
C
274 lines
12 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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* Copyright (c) 2014 Paul Sokolovsky
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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_BC_H
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#define MICROPY_INCLUDED_PY_BC_H
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#include "py/runtime.h"
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#include "py/objfun.h"
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// bytecode layout:
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//
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// func signature : var uint
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// contains six values interleaved bit-wise as: xSSSSEAA [xFSSKAED repeated]
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// x = extension another byte follows
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// S = n_state - 1 number of entries in Python value stack
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// E = n_exc_stack number of entries in exception stack
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// F = scope_flags four bits of flags, MP_SCOPE_FLAG_xxx
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// A = n_pos_args number of arguments this function takes
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// K = n_kwonly_args number of keyword-only arguments this function takes
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// D = n_def_pos_args number of default positional arguments
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//
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// prelude size : var uint
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// contains two values interleaved bit-wise as: xIIIIIIC repeated
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// x = extension another byte follows
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// I = n_info number of bytes in source info section
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// C = n_cells number of bytes/cells in closure section
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//
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// source info section:
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// simple_name : var qstr
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// source_file : var qstr
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// <line number info>
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//
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// closure section:
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// local_num0 : byte
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// ... : byte
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// local_numN : byte N = n_cells-1
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//
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// <word alignment padding> only needed if bytecode contains pointers
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//
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// <bytecode>
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//
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//
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// constant table layout:
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//
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// argname0 : obj (qstr)
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// ... : obj (qstr)
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// argnameN : obj (qstr) N = num_pos_args + num_kwonly_args
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// const0 : obj
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// constN : obj
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#define MP_BC_PRELUDE_SIG_ENCODE(S, E, scope, out_byte, out_env) \
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do { \
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/*// Get values to store in prelude */ \
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size_t F = scope->scope_flags & 0x0f; /* only need to store lower 4 flag bits */ \
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size_t A = scope->num_pos_args; \
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size_t K = scope->num_kwonly_args; \
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size_t D = scope->num_def_pos_args; \
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\
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/* Adjust S to shrink range, to compress better */ \
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S -= 1; \
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\
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/* Encode prelude */ \
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/* xSSSSEAA */ \
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uint8_t z = (S & 0xf) << 3 | (E & 1) << 2 | (A & 3); \
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S >>= 4; \
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E >>= 1; \
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A >>= 2; \
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while (S | E | F | A | K | D) { \
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out_byte(out_env, 0x80 | z); \
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/* xFSSKAED */ \
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z = (F & 1) << 6 | (S & 3) << 4 | (K & 1) << 3 \
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| (A & 1) << 2 | (E & 1) << 1 | (D & 1); \
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S >>= 2; \
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E >>= 1; \
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F >>= 1; \
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A >>= 1; \
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K >>= 1; \
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D >>= 1; \
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} \
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out_byte(out_env, z); \
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} while (0)
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#define MP_BC_PRELUDE_SIG_DECODE_INTO(ip, S, E, F, A, K, D) \
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do { \
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uint8_t z = *(ip)++; \
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/* xSSSSEAA */ \
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S = (z >> 3) & 0xf; \
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E = (z >> 2) & 0x1; \
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F = 0; \
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A = z & 0x3; \
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K = 0; \
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D = 0; \
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for (unsigned n = 0; z & 0x80; ++n) { \
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z = *(ip)++; \
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/* xFSSKAED */ \
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S |= (z & 0x30) << (2 * n); \
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E |= (z & 0x02) << n; \
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F |= ((z & 0x40) >> 6) << n; \
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A |= (z & 0x4) << n; \
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K |= ((z & 0x08) >> 3) << n; \
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D |= (z & 0x1) << n; \
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} \
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S += 1; \
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} while (0)
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#define MP_BC_PRELUDE_SIG_DECODE(ip) \
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size_t n_state, n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_pos_args; \
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MP_BC_PRELUDE_SIG_DECODE_INTO(ip, n_state, n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_pos_args)
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#define MP_BC_PRELUDE_SIZE_ENCODE(I, C, out_byte, out_env) \
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do { \
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/* Encode bit-wise as: xIIIIIIC */ \
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uint8_t z = 0; \
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do { \
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z = (I & 0x3f) << 1 | (C & 1); \
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C >>= 1; \
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I >>= 6; \
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if (C | I) { \
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z |= 0x80; \
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} \
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out_byte(out_env, z); \
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} while (C | I); \
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} while (0)
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#define MP_BC_PRELUDE_SIZE_DECODE_INTO(ip, I, C) \
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do { \
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uint8_t z; \
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C = 0; \
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I = 0; \
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for (unsigned n = 0;; ++n) { \
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z = *(ip)++; \
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/* xIIIIIIC */ \
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C |= (z & 1) << n; \
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I |= ((z & 0x7e) >> 1) << (6 * n); \
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if (!(z & 0x80)) { \
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break; \
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} \
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} \
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} while (0)
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#define MP_BC_PRELUDE_SIZE_DECODE(ip) \
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size_t n_info, n_cell; \
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MP_BC_PRELUDE_SIZE_DECODE_INTO(ip, n_info, n_cell)
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// Sentinel value for mp_code_state_t.exc_sp_idx
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#define MP_CODE_STATE_EXC_SP_IDX_SENTINEL ((uint16_t)-1)
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// To convert mp_code_state_t.exc_sp_idx to/from a pointer to mp_exc_stack_t
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#define MP_CODE_STATE_EXC_SP_IDX_FROM_PTR(exc_stack, exc_sp) ((exc_sp) + 1 - (exc_stack))
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#define MP_CODE_STATE_EXC_SP_IDX_TO_PTR(exc_stack, exc_sp_idx) ((exc_stack) + (exc_sp_idx) - 1)
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typedef struct _mp_bytecode_prelude_t {
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uint n_state;
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uint n_exc_stack;
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uint scope_flags;
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uint n_pos_args;
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uint n_kwonly_args;
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uint n_def_pos_args;
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qstr qstr_block_name;
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qstr qstr_source_file;
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const byte *line_info;
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const byte *opcodes;
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} mp_bytecode_prelude_t;
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// Exception stack entry
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typedef struct _mp_exc_stack_t {
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const byte *handler;
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// bit 0 is currently unused
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// bit 1 is whether the opcode was SETUP_WITH or SETUP_FINALLY
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mp_obj_t *val_sp;
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// Saved exception
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mp_obj_base_t *prev_exc;
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} mp_exc_stack_t;
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typedef struct _mp_code_state_t {
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// The fun_bc entry points to the underlying function object that is being executed.
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// It is needed to access the start of bytecode and the const_table.
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// It is also needed to prevent the GC from reclaiming the bytecode during execution,
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// because the ip pointer below will always point to the interior of the bytecode.
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mp_obj_fun_bc_t *fun_bc;
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const byte *ip;
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mp_obj_t *sp;
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uint16_t n_state;
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uint16_t exc_sp_idx;
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mp_obj_dict_t *old_globals;
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#if MICROPY_STACKLESS
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struct _mp_code_state_t *prev;
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#endif
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#if MICROPY_PY_SYS_SETTRACE
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struct _mp_code_state_t *prev_state;
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struct _mp_obj_frame_t *frame;
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#endif
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// Variable-length
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mp_obj_t state[0];
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// Variable-length, never accessed by name, only as (void*)(state + n_state)
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//mp_exc_stack_t exc_state[0];
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} mp_code_state_t;
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mp_uint_t mp_decode_uint(const byte **ptr);
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mp_uint_t mp_decode_uint_value(const byte *ptr);
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const byte *mp_decode_uint_skip(const byte *ptr);
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mp_vm_return_kind_t mp_execute_bytecode(mp_code_state_t *code_state, volatile mp_obj_t inject_exc);
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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);
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void mp_setup_code_state(mp_code_state_t *code_state, size_t n_args, size_t n_kw, const mp_obj_t *args);
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void mp_bytecode_print(const void *descr, const byte *code, mp_uint_t len, const mp_uint_t *const_table);
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void mp_bytecode_print2(const byte *code, size_t len, const mp_uint_t *const_table);
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const byte *mp_bytecode_print_str(const byte *ip);
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#define mp_bytecode_print_inst(code, const_table) mp_bytecode_print2(code, 1, const_table)
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// Helper macros to access pointer with least significant bits holding flags
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#define MP_TAGPTR_PTR(x) ((void*)((uintptr_t)(x) & ~((uintptr_t)3)))
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#define MP_TAGPTR_TAG0(x) ((uintptr_t)(x) & 1)
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#define MP_TAGPTR_TAG1(x) ((uintptr_t)(x) & 2)
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#define MP_TAGPTR_MAKE(ptr, tag) ((void*)((uintptr_t)(ptr) | (tag)))
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#if MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE
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uint mp_opcode_format(const byte *ip, size_t *opcode_size, bool count_var_uint);
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#endif
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static inline size_t mp_bytecode_get_source_line(const byte *line_info, size_t bc_offset) {
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size_t source_line = 1;
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size_t c;
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while ((c = *line_info)) {
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size_t b, l;
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if ((c & 0x80) == 0) {
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// 0b0LLBBBBB encoding
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b = c & 0x1f;
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l = c >> 5;
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line_info += 1;
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} else {
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// 0b1LLLBBBB 0bLLLLLLLL encoding (l's LSB in second byte)
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b = c & 0xf;
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l = ((c << 4) & 0x700) | line_info[1];
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line_info += 2;
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}
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if (bc_offset >= b) {
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bc_offset -= b;
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source_line += l;
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} else {
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// found source line corresponding to bytecode offset
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break;
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}
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}
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return source_line;
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}
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#endif // MICROPY_INCLUDED_PY_BC_H
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