diff options
Diffstat (limited to 'py/bc.h')
| -rw-r--r-- | py/bc.h | 64 |
1 files changed, 53 insertions, 11 deletions
@@ -42,17 +42,25 @@ // K = n_kwonly_args number of keyword-only arguments this function takes // D = n_def_pos_args 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 +// prelude size : var uint +// contains two values interleaved bit-wise as: xIIIIIIC repeated +// x = extension another byte follows +// I = n_info number of bytes in source info section +// C = n_cells number of bytes/cells in closure section +// +// source info section: +// simple_name : var qstr +// source_file : var qstr +// <line number info> +// +// closure section: +// local_num0 : byte +// ... : byte +// local_numN : byte N = n_cells-1 +// +// <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> | +// <bytecode> // // // constant table layout: @@ -122,6 +130,41 @@ do { \ size_t n_state, n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_pos_args; \ MP_BC_PRELUDE_SIG_DECODE_INTO(ip, n_state, n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_pos_args) +#define MP_BC_PRELUDE_SIZE_ENCODE(I, C, out_byte, out_env) \ +do { \ + /* Encode bit-wise as: xIIIIIIC */ \ + uint8_t z = 0; \ + do { \ + z = (I & 0x3f) << 1 | (C & 1); \ + C >>= 1; \ + I >>= 6; \ + if (C | I) { \ + z |= 0x80; \ + } \ + out_byte(out_env, z); \ + } while (C | I); \ +} while (0) + +#define MP_BC_PRELUDE_SIZE_DECODE_INTO(ip, I, C) \ +do { \ + uint8_t z; \ + C = 0; \ + I = 0; \ + for (unsigned n = 0;; ++n) { \ + z = *(ip)++; \ + /* xIIIIIIC */ \ + C |= (z & 1) << n; \ + I |= ((z & 0x7e) >> 1) << (6 * n); \ + if (!(z & 0x80)) { \ + break; \ + } \ + } \ +} while (0) + +#define MP_BC_PRELUDE_SIZE_DECODE(ip) \ + size_t n_info, n_cell; \ + MP_BC_PRELUDE_SIZE_DECODE_INTO(ip, n_info, n_cell) + // Sentinel value for mp_code_state_t.exc_sp_idx #define MP_CODE_STATE_EXC_SP_IDX_SENTINEL ((uint16_t)-1) @@ -139,7 +182,6 @@ typedef struct _mp_bytecode_prelude_t { qstr qstr_block_name; qstr qstr_source_file; const byte *line_info; - const byte *locals; const byte *opcodes; } mp_bytecode_prelude_t; |