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debug.c: new debug line information format mrb_debug_line_packed_map.

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It uses BER number compression of delta of instruction positions and line
numbers. BER compression is a variable length number representation.

* `mrb_debug_line_ary`: array of line numbers represented in `uint16_t`.
  `[lineno, lineno, ...]`

* `mrb_debug_line_flat_map`: array of `mrb_irep_debug_info_line`, which
  is `struct {uint32_t pos; uint16_t lineno}`, for each line.

* `mrb_debug_line_packed_map` [new]: sequence of BER compressed 2
  numbers, `pos_delta, lineno_delta`. Deltas are differences from
  previous values (starting `0`). `line_entry_counts` represents total
  length of a packed map string for this type.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2021-07-08 07:10:11 +09:00
parent fb1d4ff682
commit f16ea05a17
5 changed files with 165 additions and 25 deletions
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include/mruby/debug.h
+4 -2
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@@ -16,7 +16,8 @@ MRB_BEGIN_DECL
typedef enum mrb_debug_line_type {
mrb_debug_line_ary = 0,
mrb_debug_line_flat_map = 1
mrb_debug_line_flat_map,
mrb_debug_line_packed_map
} mrb_debug_line_type;
typedef struct mrb_irep_debug_info_line {
@@ -31,8 +32,9 @@ typedef struct mrb_irep_debug_info_file {
mrb_debug_line_type line_type;
union {
void *ptr;
mrb_irep_debug_info_line *flat_map;
uint16_t *ary;
mrb_irep_debug_info_line *flat_map;
char *packed_map;
} lines;
} mrb_irep_debug_info_file;