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py/bc: Factor out helper for line-number decoding.

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Signed-off-by: Anson Mansfield <amansfield@mantaro.com>
This commit is contained in:
Anson Mansfield
2025-06-26 12:41:01 -04:00
parent 05342b013d
commit 00fe312f83
1 changed files with 26 additions and 16 deletions
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42
py/bc.h
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@@ -308,25 +308,35 @@ static inline void mp_module_context_alloc_tables(mp_module_context_t *context,
#endif
}
typedef struct _mp_code_lineinfo_t {
size_t bc_increment;
size_t line_increment;
} mp_code_lineinfo_t;
static inline mp_code_lineinfo_t mp_bytecode_decode_lineinfo(const byte **line_info) {
mp_code_lineinfo_t result;
size_t c = (*line_info)[0];
if ((c & 0x80) == 0) {
// 0b0LLBBBBB encoding
result.bc_increment = c & 0x1f;
result.line_increment = c >> 5;
*line_info += 1;
} else {
// 0b1LLLBBBB 0bLLLLLLLL encoding (l's LSB in second byte)
result.bc_increment = c & 0xf;
result.line_increment = ((c << 4) & 0x700) | (*line_info)[1];
*line_info += 2;
}
return result;
}
static inline size_t mp_bytecode_get_source_line(const byte *line_info, const byte *line_info_top, size_t bc_offset) {
size_t source_line = 1;
while (line_info < line_info_top) {
size_t 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;
mp_code_lineinfo_t decoded = mp_bytecode_decode_lineinfo(&line_info);
if (bc_offset >= decoded.bc_increment) {
bc_offset -= decoded.bc_increment;
source_line += decoded.line_increment;
} else {
// found source line corresponding to bytecode offset
break;