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mrbconf.h option MRB_USE_ETEXT_EDATA to reduce memory.

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on platforms with _etext and _edata, mruby can distinguish string literals so that it avoids memory allocation to copy them.
for example, on my Linux box (x86 32bit), memory consumed by mrbtest decreased from 8,168,203 to 8,078,848 (reduced 88KB).
This commit is contained in:
Yukihiro "Matz" Matsumoto
2014-09-30 23:48:57 +09:00
parent bbf24b8463
commit b72e94fa6b
4 changed files with 38 additions and 11 deletions
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src/string.c
+21 -10
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@@ -140,11 +140,31 @@ mrb_str_resize(mrb_state *mrb, mrb_value str, mrb_int len)
#define mrb_obj_alloc_string(mrb) ((struct RString*)mrb_obj_alloc((mrb), MRB_TT_STRING, (mrb)->string_class))
static struct RString*
str_new_static(mrb_state *mrb, const char *p, size_t len)
{
struct RString *s;
if (len >= MRB_INT_MAX) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "string size too big");
}
s = mrb_obj_alloc_string(mrb);
s->as.heap.len = len;
s->as.heap.aux.capa = 0; /* nofree */
s->as.heap.ptr = (char *)p;
s->flags = MRB_STR_NOFREE;
return s;
}
static struct RString*
str_new(mrb_state *mrb, const char *p, size_t len)
{
struct RString *s;
if (mrb_ro_data_p(p)) {
return str_new_static(mrb, p, len);
}
s = mrb_obj_alloc_string(mrb);
if (len < RSTRING_EMBED_LEN_MAX) {
RSTR_SET_EMBED_FLAG(s);
@@ -282,16 +302,7 @@ mrb_str_new_cstr(mrb_state *mrb, const char *p)
MRB_API mrb_value
mrb_str_new_static(mrb_state *mrb, const char *p, size_t len)
{
struct RString *s;
if (len >= MRB_INT_MAX) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "string size too big");
}
s = mrb_obj_alloc_string(mrb);
s->as.heap.len = len;
s->as.heap.aux.capa = 0; /* nofree */
s->as.heap.ptr = (char *)p;
s->flags = MRB_STR_NOFREE;
struct RString *s = str_new_static(mrb, p, len);
return mrb_obj_value(s);
}