py/persistentcode: Pack qstrs directly in bytecode to reduce mpy size.
Instead of emitting two bytes in the bytecode for where the linked qstr should be written to, it is now replaced by the actual qstr data, or a reference into the qstr window. Reduces mpy file size by about 10%.
This commit is contained in:
Damien George
parent
5996eeb48f
commit
992a6e1dea
6
py/bc.c
6
py/bc.c
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@ -382,7 +382,7 @@ STATIC const byte opcode_format_table[64] = {
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#undef V
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#undef O
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uint mp_opcode_format(const byte *ip, size_t *opcode_size) {
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uint mp_opcode_format(const byte *ip, size_t *opcode_size, bool count_var_uint) {
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uint f = (opcode_format_table[*ip >> 2] >> (2 * (*ip & 3))) & 3;
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const byte *ip_start = ip;
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if (f == MP_OPCODE_QSTR) {
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@ -403,7 +403,9 @@ uint mp_opcode_format(const byte *ip, size_t *opcode_size) {
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);
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ip += 1;
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if (f == MP_OPCODE_VAR_UINT) {
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while ((*ip++ & 0x80) != 0) {
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if (count_var_uint) {
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while ((*ip++ & 0x80) != 0) {
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}
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}
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} else if (f == MP_OPCODE_OFFSET) {
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ip += 2;
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2
py/bc.h
2
py/bc.h
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@ -114,7 +114,7 @@ const byte *mp_bytecode_print_str(const byte *ip);
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#define MP_OPCODE_VAR_UINT (2)
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#define MP_OPCODE_OFFSET (3)
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uint mp_opcode_format(const byte *ip, size_t *opcode_size);
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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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@ -133,6 +133,8 @@ typedef struct _bytecode_prelude_t {
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uint code_info_size;
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} bytecode_prelude_t;
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#if MICROPY_PERSISTENT_CODE_SAVE
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// ip will point to start of opcodes
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// ip2 will point to simple_name, source_file qstrs
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STATIC void extract_prelude(const byte **ip, const byte **ip2, bytecode_prelude_t *prelude) {
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@ -149,6 +151,8 @@ STATIC void extract_prelude(const byte **ip, const byte **ip2, bytecode_prelude_
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}
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}
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#endif
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#endif // MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE
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#if MICROPY_PERSISTENT_CODE_LOAD
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@ -165,10 +169,14 @@ STATIC void read_bytes(mp_reader_t *reader, byte *buf, size_t len) {
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}
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}
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STATIC size_t read_uint(mp_reader_t *reader) {
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STATIC size_t read_uint(mp_reader_t *reader, byte **out) {
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size_t unum = 0;
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for (;;) {
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byte b = reader->readbyte(reader->data);
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if (out != NULL) {
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**out = b;
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++*out;
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}
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unum = (unum << 7) | (b & 0x7f);
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if ((b & 0x80) == 0) {
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break;
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@ -178,7 +186,7 @@ STATIC size_t read_uint(mp_reader_t *reader) {
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}
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STATIC qstr load_qstr(mp_reader_t *reader, qstr_window_t *qw) {
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size_t len = read_uint(reader);
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size_t len = read_uint(reader, NULL);
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if (len & 1) {
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// qstr in window
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return qstr_window_access(qw, len >> 1);
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@ -197,7 +205,7 @@ STATIC mp_obj_t load_obj(mp_reader_t *reader) {
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if (obj_type == 'e') {
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return MP_OBJ_FROM_PTR(&mp_const_ellipsis_obj);
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} else {
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size_t len = read_uint(reader);
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size_t len = read_uint(reader, NULL);
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vstr_t vstr;
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vstr_init_len(&vstr, len);
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read_bytes(reader, (byte*)vstr.buf, len);
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@ -212,41 +220,66 @@ STATIC mp_obj_t load_obj(mp_reader_t *reader) {
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}
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}
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STATIC void load_bytecode_qstrs(mp_reader_t *reader, qstr_window_t *qw, byte *ip, byte *ip_top) {
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STATIC void load_prelude(mp_reader_t *reader, byte **ip, byte **ip2, bytecode_prelude_t *prelude) {
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prelude->n_state = read_uint(reader, ip);
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prelude->n_exc_stack = read_uint(reader, ip);
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read_bytes(reader, *ip, 4);
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prelude->scope_flags = *(*ip)++;
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prelude->n_pos_args = *(*ip)++;
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prelude->n_kwonly_args = *(*ip)++;
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prelude->n_def_pos_args = *(*ip)++;
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*ip2 = *ip;
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prelude->code_info_size = read_uint(reader, ip2);
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read_bytes(reader, *ip2, prelude->code_info_size - (*ip2 - *ip));
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*ip += prelude->code_info_size;
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while ((*(*ip)++ = read_byte(reader)) != 255) {
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}
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}
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STATIC void load_bytecode(mp_reader_t *reader, qstr_window_t *qw, byte *ip, byte *ip_top) {
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while (ip < ip_top) {
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*ip = read_byte(reader);
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size_t sz;
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uint f = mp_opcode_format(ip, &sz);
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uint f = mp_opcode_format(ip, &sz, false);
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++ip;
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--sz;
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if (f == MP_OPCODE_QSTR) {
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qstr qst = load_qstr(reader, qw);
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ip[1] = qst;
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ip[2] = qst >> 8;
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*ip++ = qst;
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*ip++ = qst >> 8;
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sz -= 2;
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} else if (f == MP_OPCODE_VAR_UINT) {
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while ((*ip++ = read_byte(reader)) & 0x80) {
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}
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}
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read_bytes(reader, ip, sz);
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ip += sz;
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}
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}
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STATIC mp_raw_code_t *load_raw_code(mp_reader_t *reader, qstr_window_t *qw) {
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// load bytecode
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size_t bc_len = read_uint(reader);
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// get bytecode size and allocate memory for it
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size_t bc_len = read_uint(reader, NULL);
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byte *bytecode = m_new(byte, bc_len);
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read_bytes(reader, bytecode, bc_len);
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// extract prelude
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const byte *ip = bytecode;
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const byte *ip2;
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// load prelude
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byte *ip = bytecode;
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byte *ip2;
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bytecode_prelude_t prelude;
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extract_prelude(&ip, &ip2, &prelude);
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load_prelude(reader, &ip, &ip2, &prelude);
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// load bytecode
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load_bytecode(reader, qw, ip, bytecode + bc_len);
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// load qstrs and link global qstr ids into bytecode
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qstr simple_name = load_qstr(reader, qw);
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qstr source_file = load_qstr(reader, qw);
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((byte*)ip2)[0] = simple_name; ((byte*)ip2)[1] = simple_name >> 8;
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((byte*)ip2)[2] = source_file; ((byte*)ip2)[3] = source_file >> 8;
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load_bytecode_qstrs(reader, qw, (byte*)ip, bytecode + bc_len);
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// load constant table
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size_t n_obj = read_uint(reader);
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size_t n_raw_code = read_uint(reader);
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size_t n_obj = read_uint(reader, NULL);
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size_t n_raw_code = read_uint(reader, NULL);
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mp_uint_t *const_table = m_new(mp_uint_t, prelude.n_pos_args + prelude.n_kwonly_args + n_obj + n_raw_code);
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mp_uint_t *ct = const_table;
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for (size_t i = 0; i < prelude.n_pos_args + prelude.n_kwonly_args; ++i) {
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@ -382,14 +415,18 @@ STATIC void save_obj(mp_print_t *print, mp_obj_t o) {
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}
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}
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STATIC void save_bytecode_qstrs(mp_print_t *print, qstr_window_t *qw, const byte *ip, const byte *ip_top) {
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STATIC void save_bytecode(mp_print_t *print, qstr_window_t *qw, const byte *ip, const byte *ip_top) {
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while (ip < ip_top) {
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size_t sz;
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uint f = mp_opcode_format(ip, &sz);
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uint f = mp_opcode_format(ip, &sz, true);
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if (f == MP_OPCODE_QSTR) {
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mp_print_bytes(print, ip, 1);
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qstr qst = ip[1] | (ip[2] << 8);
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save_qstr(print, qw, qst);
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ip += 3;
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sz -= 3;
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}
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mp_print_bytes(print, ip, sz);
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ip += sz;
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}
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}
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@ -399,20 +436,24 @@ STATIC void save_raw_code(mp_print_t *print, mp_raw_code_t *rc, qstr_window_t *q
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mp_raise_ValueError("can only save bytecode");
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}
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// save bytecode
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mp_print_uint(print, rc->data.u_byte.bc_len);
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mp_print_bytes(print, rc->data.u_byte.bytecode, rc->data.u_byte.bc_len);
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// extract prelude
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const byte *ip = rc->data.u_byte.bytecode;
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const byte *ip2;
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bytecode_prelude_t prelude;
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extract_prelude(&ip, &ip2, &prelude);
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// save prelude
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size_t prelude_len = ip - rc->data.u_byte.bytecode;
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const byte *ip_top = rc->data.u_byte.bytecode + rc->data.u_byte.bc_len;
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mp_print_uint(print, rc->data.u_byte.bc_len);
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mp_print_bytes(print, rc->data.u_byte.bytecode, prelude_len);
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// save bytecode
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save_bytecode(print, qstr_window, ip, ip_top);
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// save qstrs
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save_qstr(print, qstr_window, ip2[0] | (ip2[1] << 8)); // simple_name
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save_qstr(print, qstr_window, ip2[2] | (ip2[3] << 8)); // source_file
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save_bytecode_qstrs(print, qstr_window, ip, rc->data.u_byte.bytecode + rc->data.u_byte.bc_len);
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// save constant table
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mp_print_uint(print, rc->data.u_byte.n_obj);
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@ -174,7 +174,7 @@ def make_opcode_format():
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))
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# this function mirrors that in py/bc.c
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def mp_opcode_format(bytecode, ip, opcode_format=make_opcode_format()):
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def mp_opcode_format(bytecode, ip, count_var_uint, opcode_format=make_opcode_format()):
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opcode = bytecode[ip]
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ip_start = ip
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f = (opcode_format[opcode >> 2] >> (2 * (opcode & 3))) & 3
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@ -194,9 +194,10 @@ def mp_opcode_format(bytecode, ip, opcode_format=make_opcode_format()):
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)
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ip += 1
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if f == MP_OPCODE_VAR_UINT:
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while bytecode[ip] & 0x80 != 0:
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if count_var_uint:
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while bytecode[ip] & 0x80 != 0:
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ip += 1
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ip += 1
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ip += 1
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elif f == MP_OPCODE_OFFSET:
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ip += 2
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ip += extra_byte
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@ -288,7 +289,7 @@ class RawCode:
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print()
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ip = self.ip
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while ip < len(self.bytecode):
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f, sz = mp_opcode_format(self.bytecode, ip)
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f, sz = mp_opcode_format(self.bytecode, ip, True)
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if f == 1:
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qst = self._unpack_qstr(ip + 1).qstr_id
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extra = '' if sz == 3 else ' 0x%02x,' % self.bytecode[ip + 3]
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@ -393,10 +394,28 @@ class RawCode:
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print(' },')
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print('};')
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def read_uint(f):
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class BytecodeBuffer:
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def __init__(self, size):
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self.buf = bytearray(size)
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self.idx = 0
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def is_full(self):
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return self.idx == len(self.buf)
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def append(self, b):
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self.buf[self.idx] = b
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self.idx += 1
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def read_byte(f, out=None):
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b = bytes_cons(f.read(1))[0]
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if out is not None:
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out.append(b)
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return b
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def read_uint(f, out=None):
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i = 0
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while True:
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b = bytes_cons(f.read(1))[0]
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b = read_byte(f, out)
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i = (i << 7) | (b & 0x7f)
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if b & 0x80 == 0:
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break
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@ -435,31 +454,55 @@ def read_obj(f):
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else:
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assert 0
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def read_qstr_and_pack(f, bytecode, ip, qstr_win):
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qst = read_qstr(f, qstr_win)
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bytecode[ip] = qst & 0xff
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bytecode[ip + 1] = qst >> 8
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def read_prelude(f, bytecode):
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n_state = read_uint(f, bytecode)
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n_exc_stack = read_uint(f, bytecode)
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scope_flags = read_byte(f, bytecode)
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n_pos_args = read_byte(f, bytecode)
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n_kwonly_args = read_byte(f, bytecode)
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n_def_pos_args = read_byte(f, bytecode)
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l1 = bytecode.idx
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code_info_size = read_uint(f, bytecode)
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l2 = bytecode.idx
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for _ in range(code_info_size - (l2 - l1)):
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read_byte(f, bytecode)
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while read_byte(f, bytecode) != 255:
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pass
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return l2, (n_state, n_exc_stack, scope_flags, n_pos_args, n_kwonly_args, n_def_pos_args, code_info_size)
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def read_bytecode_qstrs(file, bytecode, ip, qstr_win):
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while ip < len(bytecode):
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f, sz = mp_opcode_format(bytecode, ip)
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if f == 1:
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read_qstr_and_pack(file, bytecode, ip + 1, qstr_win)
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ip += sz
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def read_qstr_and_pack(f, bytecode, qstr_win):
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qst = read_qstr(f, qstr_win)
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bytecode.append(qst & 0xff)
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bytecode.append(qst >> 8)
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def read_bytecode(file, bytecode, qstr_win):
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while not bytecode.is_full():
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op = read_byte(file, bytecode)
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f, sz = mp_opcode_format(bytecode.buf, bytecode.idx - 1, False)
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sz -= 1
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if f == MP_OPCODE_QSTR:
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read_qstr_and_pack(file, bytecode, qstr_win)
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sz -= 2
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elif f == MP_OPCODE_VAR_UINT:
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while read_byte(file, bytecode) & 0x80:
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pass
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for _ in range(sz):
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read_byte(file, bytecode)
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def read_raw_code(f, qstr_win):
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bc_len = read_uint(f)
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bytecode = bytearray(f.read(bc_len))
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ip, ip2, prelude = extract_prelude(bytecode)
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read_qstr_and_pack(f, bytecode, ip2, qstr_win) # simple_name
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read_qstr_and_pack(f, bytecode, ip2 + 2, qstr_win) # source_file
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read_bytecode_qstrs(f, bytecode, ip, qstr_win)
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bytecode = BytecodeBuffer(bc_len)
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name_idx, prelude = read_prelude(f, bytecode)
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read_bytecode(f, bytecode, qstr_win)
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bytecode.idx = name_idx # rewind to where qstrs are in prelude
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read_qstr_and_pack(f, bytecode, qstr_win) # simple_name
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read_qstr_and_pack(f, bytecode, qstr_win) # source_file
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n_obj = read_uint(f)
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n_raw_code = read_uint(f)
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qstrs = [read_qstr(f, qstr_win) for _ in range(prelude[3] + prelude[4])]
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objs = [read_obj(f) for _ in range(n_obj)]
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raw_codes = [read_raw_code(f, qstr_win) for _ in range(n_raw_code)]
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return RawCode(bytecode, qstrs, objs, raw_codes)
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return RawCode(bytecode.buf, qstrs, objs, raw_codes)
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def read_mpy(filename):
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with open(filename, 'rb') as f:
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