parse.y: use rb_fstring() for strings stored in the symbol table

* parse.y (register_symid_str): use fstrings in symbol table
  [Bug #9171] [ruby-core:58656]
* parse.y (rb_id2str): ditto
* string.c (rb_fstring): create frozen_strings on first usage. this
  allows rb_fstring() calls from the parser (before cString is created)
* string.c (fstring_set_class_i): set klass on fstrings generated
  before cString was defined
* string.c (Init_String): convert frozen_strings table to String
  objects after boot
* ext/-test-/symbol/type.c (bug_sym_id2str): expose rb_id2str()
* test/-ext-/symbol/test_type.rb (module Test_Symbol): verify symbol
  table entries are fstrings

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44057 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/ext/-test-/symbol/type.c b/ext/-test-/symbol/type.c
index e0b2fff2f9..17f2d6824b 100644
--- a/ext/-test-/symbol/type.c
+++ b/ext/-test-/symbol/type.c
@@ -35,9 +35,16 @@ bug_sym_attrset(VALUE self, VALUE name)
     return ID2SYM(id);
 }
 
+static VALUE
+bug_id2str(VALUE self, VALUE sym)
+{
+    return rb_id2str(SYM2ID(sym));
+}
+
 void
 Init_type(VALUE klass)
 {
     FOREACH_ID_TYPES(declare_symbol_type_p);
     rb_define_singleton_method(klass, "attrset", bug_sym_attrset, 1);
+    rb_define_singleton_method(klass, "id2str", bug_id2str, 1);
 }