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Add new type of shared string: RSTR_FSHARED.

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`RSTR_FSHARED` use frozen strings as shared body instead of
`struct mrb_shared_string`. This reduces allocation from
literal strings.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2017-09-26 23:07:37 +09:00
parent 473b7d0efd
commit 7edbe428ca
6 changed files with 86 additions and 41 deletions
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include/mruby/string.h
+7 -1
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@@ -26,6 +26,7 @@ struct RString {
union {
mrb_int capa;
struct mrb_shared_string *shared;
struct RString *fshared;
} aux;
char *ptr;
} heap;
@@ -59,6 +60,10 @@ struct RString {
#define RSTR_SET_SHARED_FLAG(s) ((s)->flags |= MRB_STR_SHARED)
#define RSTR_UNSET_SHARED_FLAG(s) ((s)->flags &= ~MRB_STR_SHARED)
#define RSTR_FSHARED_P(s) ((s)->flags & MRB_STR_FSHARED)
#define RSTR_SET_FSHARED_FLAG(s) ((s)->flags |= MRB_STR_FSHARED)
#define RSTR_UNSET_FSHARED_FLAG(s) ((s)->flags &= ~MRB_STR_FSHARED)
#define RSTR_NOFREE_P(s) ((s)->flags & MRB_STR_NOFREE)
#define RSTR_SET_NOFREE_FLAG(s) ((s)->flags |= MRB_STR_NOFREE)
#define RSTR_UNSET_NOFREE_FLAG(s) ((s)->flags &= ~MRB_STR_NOFREE)
@@ -76,7 +81,8 @@ struct RString {
MRB_API mrb_int mrb_str_strlen(mrb_state*, struct RString*);
#define MRB_STR_SHARED 1
#define MRB_STR_NOFREE 2
#define MRB_STR_FSHARED 2
#define MRB_STR_NOFREE 4
#define MRB_STR_NO_UTF 8
#define MRB_STR_EMBED 16
#define MRB_STR_EMBED_LEN_MASK 0x3e0