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py: Use variable length encoded uints in more places in bytecode.

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Code-info size, block name, source name, n_state and n_exc_stack now use
variable length encoded uints.  This saves 7-9 bytes per bytecode
function for most functions.
This commit is contained in:
Damien George
2014-09-04 14:44:01 +01:00
parent dda46460ff
commit b534e1b9f1
8 changed files with 329 additions and 244 deletions
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19
py/vm.c
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@@ -921,26 +921,25 @@ exception_handler:
// But consider how to handle nested exceptions.
// TODO need a better way of not adding traceback to constant objects (right now, just GeneratorExit_obj and MemoryError_obj)
if (mp_obj_is_exception_instance(nlr.ret_val) && nlr.ret_val != &mp_const_GeneratorExit_obj && nlr.ret_val != &mp_const_MemoryError_obj) {
const byte *code_info = code_state->code_info;
mp_uint_t code_info_size = code_info[0] | (code_info[1] << 8) | (code_info[2] << 16) | (code_info[3] << 24);
qstr source_file = code_info[4] | (code_info[5] << 8) | (code_info[6] << 16) | (code_info[7] << 24);
qstr block_name = code_info[8] | (code_info[9] << 8) | (code_info[10] << 16) | (code_info[11] << 24);
mp_uint_t bc = code_state->ip - code_info - code_info_size;
//printf("find %lu %d %d\n", bc, code_info[12], code_info[13]);
const byte *ip = code_state->code_info;
mp_uint_t code_info_size = mp_decode_uint(&ip);
qstr block_name = mp_decode_uint(&ip);
qstr source_file = mp_decode_uint(&ip);
mp_uint_t bc = code_state->ip - code_state->code_info - code_info_size;
mp_uint_t source_line = 1;
mp_uint_t c;
for (const byte *ci = code_info + 12; (c = *ci);) {
while ((c = *ip)) {
mp_uint_t b, l;
if ((c & 0x80) == 0) {
// 0b0LLBBBBB encoding
b = c & 0x1f;
l = c >> 5;
ci += 1;
ip += 1;
} else {
// 0b1LLLBBBB 0bLLLLLLLL encoding (l's LSB in second byte)
b = c & 0xf;
l = ((c << 4) & 0x700) | ci[1];
ci += 2;
l = ((c << 4) & 0x700) | ip[1];
ip += 2;
}
if (bc >= b) {
bc -= b;