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#include "mruby/debug.h"
#include "mruby.h"
#include "mruby/irep.h"
#include <string.h>
static mrb_irep_debug_info_file*
get_file(mrb_irep_debug_info* info, uint32_t const pc)
{
if(pc >= info->pc_count) { return NULL; }
// get upper bound
mrb_irep_debug_info_file** ret = info->files;
int32_t count = info->flen;
while (count > 0) {
int32_t const step = count / 2;
mrb_irep_debug_info_file** const it = ret + step;
if (!(pc < (*it)->start_pos)) {
ret = it + 1;
count -= step + 1;
} else { count = step; }
}
--ret;
mrb_assert(ret < (info->files + info->flen));
mrb_assert((*ret)->start_pos <= pc &&
pc < (((ret + 1 - info->files) < info->flen)
? (*(ret+1))->start_pos : info->pc_count));
return *ret;
}
static mrb_debug_line_type
select_line_type(uint16_t const* lines, size_t lines_len)
{
size_t line_count = 0;
int prev_line = -1;
for (size_t i = 0; i < lines_len; ++i) {
if (lines[i] != prev_line) {
++line_count;
}
}
return (sizeof(uint16_t) * lines_len) <= (sizeof(mrb_irep_debug_info_line) * line_count)
? mrb_debug_line_ary : mrb_debug_line_flat_map;
}
char const*
mrb_debug_get_filename(mrb_irep* irep, uint32_t pc)
{
mrb_irep_debug_info_file* f = NULL;
if (irep) {
if (!irep->debug_info) { return irep->filename; }
else if ((f = get_file(irep->debug_info, pc))) {
return f->filename;
}
}
return NULL;
}
int32_t
mrb_debug_get_line(mrb_irep* irep, uint32_t const pc)
{
mrb_irep_debug_info_file* f = NULL;
if (irep) {
if (!irep->debug_info) {
return irep->lines? irep->lines[pc] : -1;
}
else if ((f = get_file(irep->debug_info, pc))) {
switch(f->line_type) {
case mrb_debug_line_ary:
mrb_assert(pc < (f->start_pos + f->line_entry_count));
return f->line_ary[pc];
case mrb_debug_line_flat_map: {
// get upper bound
mrb_irep_debug_info_line* ret = f->line_flat_map;
int32_t count = f->line_entry_count;
while (count > 0) {
int32_t const step = count / 2;
mrb_irep_debug_info_line* const it = ret + step;
if (!(pc < it->start_pos)) {
ret = it + 1;
count -= step + 1;
} else { count = step; }
}
--ret;
mrb_assert((ret - f->line_flat_map) < f->line_entry_count);
mrb_assert(ret->start_pos <= pc &&
pc < (((ret + 1 - f->line_flat_map) < f->line_entry_count)
? (ret+1)->start_pos : irep->debug_info->pc_count));
return ret->line;
}
}
}
}
return -1;
}
mrb_irep_debug_info*
mrb_debug_info_alloc(mrb_state* mrb, mrb_irep* irep)
{
static mrb_irep_debug_info const initial = { 0, 0, NULL };
mrb_assert(!irep->debug_info);
mrb_irep_debug_info* const ret = (mrb_irep_debug_info*)mrb_malloc(mrb, sizeof(mrb_irep_debug_info));
*ret = initial;
irep->debug_info = ret;
return ret;
}
mrb_irep_debug_info_file*
mrb_debug_info_append_file(mrb_state* mrb, mrb_irep* irep,
uint32_t const start_pos, uint32_t const end_pos)
{
if (!irep->debug_info) { return NULL; }
mrb_assert(irep->filename);
mrb_assert(irep->lines);
mrb_irep_debug_info* info = irep->debug_info;
if (info->flen > 0 && strcmp(irep->filename, info->files[info->flen - 1]->filename) == 0) {
return NULL;
}
mrb_irep_debug_info_file* const ret =
(mrb_irep_debug_info_file*)mrb_malloc(mrb, sizeof(mrb_irep_debug_info_file));
info->files =
(mrb_irep_debug_info_file*)info->files
? mrb_realloc(mrb, info->files, sizeof(mrb_irep_debug_info_file*) * (info->flen + 1))
: mrb_malloc(mrb, sizeof(mrb_irep_debug_info_file*));
info->files[info->flen++] = ret;
uint32_t const file_pc_count = end_pos - start_pos;
ret->start_pos = start_pos;
info->pc_count = end_pos;
size_t const fn_len = strlen(irep->filename);
ret->filename_sym = mrb_intern2(mrb, irep->filename, fn_len);
size_t len = 0;
ret->filename = mrb_sym2name_len(mrb, ret->filename_sym, &len);
ret->line_type = select_line_type(irep->lines + start_pos, end_pos - start_pos);
ret->line_ptr = NULL;
switch(ret->line_type) {
case mrb_debug_line_ary:
ret->line_entry_count = file_pc_count;
ret->line_ary = mrb_malloc(mrb, sizeof(uint16_t) * file_pc_count);
for(uint32_t i = 0; i < file_pc_count; ++i) {
ret->line_ary[i] = irep->lines[start_pos + i];
}
break;
case mrb_debug_line_flat_map: {
ret->line_flat_map = mrb_malloc(mrb, sizeof(mrb_irep_debug_info_line) * 1);
ret->line_entry_count = 0;
uint16_t prev_line = 0;
for(uint32_t i = 0; i < file_pc_count; ++i) {
if(irep->lines[start_pos + i] == prev_line) { continue; }
ret->line_flat_map = mrb_realloc(
mrb, ret->line_flat_map,
sizeof(mrb_irep_debug_info_line) * (ret->line_entry_count + 1));
mrb_irep_debug_info_line const m = { start_pos + i, irep->lines[start_pos + i] };
ret->line_flat_map[ret->line_entry_count] = m;
// update
++ret->line_entry_count;
prev_line = irep->lines[start_pos + i];
}
} break;
default: mrb_assert(0); break;
}
return ret;
}
void
mrb_debug_info_free(mrb_state* mrb, mrb_irep_debug_info* d)
{
if(!d) { return; }
for(uint32_t i = 0; i < d->flen; ++i) {
mrb_assert(d->files[i]);
mrb_free(mrb, d->files[i]->line_ptr);
mrb_free(mrb, d->files[i]);
}
mrb_free(mrb, d->files);
mrb_free(mrb, d);
}
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