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, 3 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index 8207ad7133..2a0c5c64f7 100644
--- a/parse.y
+++ b/parse.y
@@ -10334,6 +10334,7 @@ static ID
 register_symid_str(ID id, VALUE str)
 {
     OBJ_FREEZE(str);
+    str = rb_fstring(str);
 
     if (RUBY_DTRACE_SYMBOL_CREATE_ENABLED()) {
 	RUBY_DTRACE_SYMBOL_CREATE(RSTRING_PTR(str), rb_sourcefile(), rb_sourceline());
@@ -10544,6 +10545,7 @@ rb_id2str(ID id)
 		name[1] = 0;
 		str = rb_usascii_str_new(name, 1);
 		OBJ_FREEZE(str);
+		str = rb_fstring(str);
 		global_symbols.op_sym[i] = str;
 		global_symbols.minor_marked = 0;
 	    }
@@ -10555,6 +10557,7 @@ rb_id2str(ID id)
 		if (!str) {
 		    str = rb_usascii_str_new2(op_tbl[i].name);
 		    OBJ_FREEZE(str);
+		    str = rb_fstring(str);
 		    global_symbols.op_sym[i] = str;
 		    global_symbols.minor_marked = 0;
 		}