diff options
Diffstat (limited to 'string.c')
| -rw-r--r-- | string.c | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -131,6 +131,26 @@ VALUE rb_cSymbol; #define STR_ENC_GET(str) rb_enc_from_index(ENCODING_GET(str)) +static st_table* frozen_strings; + +static const struct st_hash_type fstring_hash_type = { + rb_str_cmp, + rb_str_hash +}; + +VALUE +rb_fstring(VALUE str) +{ + VALUE fstr; + if (!st_lookup(frozen_strings, (st_data_t)str, (st_data_t*)&fstr)) { + fstr = rb_str_dup(str); + OBJ_FREEZE(fstr); + RBASIC(fstr)->flags |= RSTRING_FSTR; + st_insert(frozen_strings, fstr, fstr); + } + return fstr; +} + static inline int single_byte_optimizable(VALUE str) { @@ -838,6 +858,9 @@ rb_free_tmp_buffer(volatile VALUE *store) void rb_str_free(VALUE str) { + if (FL_TEST(str, RSTRING_FSTR)) { + st_delete(frozen_strings, (st_data_t*)&str, NULL); + } if (!STR_EMBED_P(str) && !STR_SHARED_P(str)) { xfree(RSTRING(str)->as.heap.ptr); } @@ -8672,6 +8695,8 @@ Init_String(void) #undef rb_intern #define rb_intern(str) rb_intern_const(str) + frozen_strings = st_init_table(&fstring_hash_type); + rb_cString = rb_define_class("String", rb_cObject); rb_include_module(rb_cString, rb_mComparable); rb_define_alloc_func(rb_cString, empty_str_alloc); |