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#include <string.h>
#include <mruby.h>
#include <mruby/irep.h>
#include <mruby/debug.h>
static mrb_irep_debug_info_file*
get_file(mrb_irep_debug_info *info, uint32_t pc)
{
mrb_irep_debug_info_file **ret;
int32_t count;
if (pc >= info->pc_count) { return NULL; }
/* get upper bound */
ret = info->files;
count = info->flen;
while (count > 0) {
int32_t step = count / 2;
mrb_irep_debug_info_file **it = ret + step;
if (!(pc < (*it)->start_pos)) {
ret = it + 1;
count -= step + 1;
}
else { count = step; }
}
--ret;
/* check returning file exists inside debug info */
mrb_assert(info->files <= ret && ret < (info->files + info->flen));
/* check pc is within the range of returning file */
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(const uint16_t *lines, size_t lines_len)
{
size_t line_count = 0;
int prev_line = -1;
size_t i;
for (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;
}
MRB_API char const*
mrb_debug_get_filename(mrb_irep *irep, ptrdiff_t pc)
{
if (irep && pc >= 0 && pc < irep->ilen) {
mrb_irep_debug_info_file* f = NULL;
if (!irep->debug_info) { return irep->filename; }
else if ((f = get_file(irep->debug_info, (uint32_t)pc))) {
return f->filename;
}
}
return NULL;
}
MRB_API int32_t
mrb_debug_get_line(mrb_irep *irep, ptrdiff_t pc)
{
if (irep && pc >= 0 && pc < irep->ilen) {
mrb_irep_debug_info_file* f = NULL;
if (!irep->debug_info) {
return irep->lines? irep->lines[pc] : -1;
}
else if ((f = get_file(irep->debug_info, (uint32_t)pc))) {
switch (f->line_type) {
case mrb_debug_line_ary:
mrb_assert(f->start_pos <= pc && pc < (f->start_pos + f->line_entry_count));
return f->lines.ary[pc - f->start_pos];
case mrb_debug_line_flat_map: {
/* get upper bound */
mrb_irep_debug_info_line *ret = f->lines.flat_map;
uint32_t count = f->line_entry_count;
while (count > 0) {
int32_t step = count / 2;
mrb_irep_debug_info_line *it = ret + step;
if (!(pc < it->start_pos)) {
ret = it + 1;
count -= step + 1;
}
else { count = step; }
}
--ret;
/* check line entry pointer range */
mrb_assert(f->lines.flat_map <= ret && ret < (f->lines.flat_map + f->line_entry_count));
/* check pc range */
mrb_assert(ret->start_pos <= pc &&
pc < (((uint32_t)(ret + 1 - f->lines.flat_map) < f->line_entry_count)
? (ret+1)->start_pos : irep->debug_info->pc_count));
return ret->line;
}
}
}
}
return -1;
}
MRB_API mrb_irep_debug_info*
mrb_debug_info_alloc(mrb_state *mrb, mrb_irep *irep)
{
static const mrb_irep_debug_info initial = { 0, 0, NULL };
mrb_irep_debug_info *ret;
mrb_assert(!irep->debug_info);
ret = (mrb_irep_debug_info *)mrb_malloc(mrb, sizeof(*ret));
*ret = initial;
irep->debug_info = ret;
return ret;
}
MRB_API mrb_irep_debug_info_file*
mrb_debug_info_append_file(mrb_state *mrb, mrb_irep *irep,
uint32_t start_pos, uint32_t end_pos)
{
mrb_irep_debug_info *info;
mrb_irep_debug_info_file *ret;
uint32_t file_pc_count;
size_t fn_len;
mrb_int len;
uint32_t i;
if (!irep->debug_info) { return NULL; }
mrb_assert(irep->filename);
mrb_assert(irep->lines);
info = irep->debug_info;
if (info->flen > 0 && strcmp(irep->filename, info->files[info->flen - 1]->filename) == 0) {
return NULL;
}
ret = (mrb_irep_debug_info_file *)mrb_malloc(mrb, sizeof(*ret));
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;
file_pc_count = end_pos - start_pos;
ret->start_pos = start_pos;
info->pc_count = end_pos;
fn_len = strlen(irep->filename);
ret->filename_sym = mrb_intern(mrb, irep->filename, fn_len);
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->lines.ptr = NULL;
switch (ret->line_type) {
case mrb_debug_line_ary:
ret->line_entry_count = file_pc_count;
ret->lines.ary = (uint16_t*)mrb_malloc(mrb, sizeof(uint16_t) * file_pc_count);
for (i = 0; i < file_pc_count; ++i) {
ret->lines.ary[i] = irep->lines[start_pos + i];
}
break;
case mrb_debug_line_flat_map: {
uint16_t prev_line = 0;
mrb_irep_debug_info_line m;
ret->lines.flat_map = (mrb_irep_debug_info_line*)mrb_malloc(mrb, sizeof(mrb_irep_debug_info_line) * 1);
ret->line_entry_count = 0;
for (i = 0; i < file_pc_count; ++i) {
if (irep->lines[start_pos + i] == prev_line) { continue; }
ret->lines.flat_map = (mrb_irep_debug_info_line*)mrb_realloc(
mrb, ret->lines.flat_map,
sizeof(mrb_irep_debug_info_line) * (ret->line_entry_count + 1));
m.start_pos = start_pos + i;
m.line = irep->lines[start_pos + i];
ret->lines.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;
}
MRB_API void
mrb_debug_info_free(mrb_state *mrb, mrb_irep_debug_info *d)
{
uint32_t i;
if (!d) { return; }
for (i = 0; i < d->flen; ++i) {
mrb_assert(d->files[i]);
mrb_free(mrb, d->files[i]->lines.ptr);
mrb_free(mrb, d->files[i]);
}
mrb_free(mrb, d->files);
mrb_free(mrb, d);
}
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