* encoding.c (rb_enc_set_index, rb_enc_associate_index): should

  check if frozen.
* parse.y (rb_intern3), ruby.c (process_options, ruby_script):
  defer freezing after associating encodings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32435 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Thu Jul  7 15:44:42 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* encoding.c (rb_enc_set_index, rb_enc_associate_index): should
+	  check if frozen.
+
+	* parse.y (rb_intern3), ruby.c (process_options, ruby_script):
+	  defer freezing after associating encodings.
+
 Thu Jul  7 15:16:51 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* numeric.c (rb_num2ull): use own switch sentense.

encoding.c

@@ -685,22 +685,29 @@ rb_enc_get_index(VALUE obj)
     return i;
 }
 
-void
-rb_enc_set_index(VALUE obj, int idx)
+static void
+enc_set_index(VALUE obj, int idx)
 {
     if (idx < ENCODING_INLINE_MAX) {
 	ENCODING_SET_INLINED(obj, idx);
 	return;
     }
     ENCODING_SET_INLINED(obj, ENCODING_INLINE_MAX);
     rb_ivar_set(obj, rb_id_encoding(), INT2NUM(idx));
-    return;
+}
+
+void
+rb_enc_set_index(VALUE obj, int idx)
+{
+    rb_check_frozen(obj);
+    enc_set_index(obj, idx);
 }
 
 VALUE
 rb_enc_associate_index(VALUE obj, int idx)
 {
 /*    enc_check_capable(obj);*/
+    rb_check_frozen(obj);
     if (rb_enc_get_index(obj) == idx)
 	return obj;
     if (SPECIAL_CONST_P(obj)) {
@@ -710,7 +717,7 @@ rb_enc_associate_index(VALUE obj, int idx)
 	!rb_enc_asciicompat(rb_enc_from_index(idx))) {
 	ENC_CODERANGE_CLEAR(obj);
     }
-    rb_enc_set_index(obj, idx);
+    enc_set_index(obj, idx);
     return obj;
 }
 

ext/-test-/string/enc_associate.c

@@ -0,0 +1,13 @@
+#include "ruby.h"
+
+VALUE
+bug_str_enc_associate(VALUE str, VALUE enc)
+{
+    return rb_enc_associate(str, rb_to_encoding(enc));
+}
+
+void
+Init_enc_associate(VALUE klass)
+{
+    rb_define_method(klass, "associate_encoding!", bug_str_enc_associate, 1);
+}

parse.y

@@ -9723,13 +9723,14 @@ rb_intern3(const char *name, long len, rb_encoding *enc)
     int mb;
     st_data_t data;
     struct RString fake_str;
-    fake_str.basic.flags = T_STRING|RSTRING_NOEMBED|FL_FREEZE;
+    fake_str.basic.flags = T_STRING|RSTRING_NOEMBED;
     fake_str.basic.klass = rb_cString;
     fake_str.as.heap.len = len;
     fake_str.as.heap.ptr = (char *)name;
     fake_str.as.heap.aux.capa = len;
     str = (VALUE)&fake_str;
     rb_enc_associate(str, enc);
+    OBJ_FREEZE(str);
 
     if (rb_enc_str_coderange(str) == ENC_CODERANGE_BROKEN) {
     	rb_raise(rb_eEncodingError, "invalid encoding symbol");

ruby.c

@@ -1309,12 +1309,12 @@ process_options(int argc, char **argv, struct cmdline_options *opt)
 #if defined DOSISH || defined __CYGWIN__
     translit_char(RSTRING_PTR(opt->script_name), '\\', '/');
 #endif
-    rb_obj_freeze(opt->script_name);
 
     ruby_init_loadpath_safe(opt->safe_level);
     rb_enc_find_index("encdb");
     lenc = rb_locale_encoding();
     rb_enc_associate(rb_progname, lenc);
+    rb_obj_freeze(rb_progname);
     parser = rb_parser_new();
     if (opt->dump & DUMP_BIT(yydebug)) {
 	rb_parser_set_yydebug(parser, Qtrue);
@@ -1342,6 +1342,7 @@ process_options(int argc, char **argv, struct cmdline_options *opt)
 	opt->intern.enc.index = -1;
     }
     rb_enc_associate(opt->script_name, lenc);
+    rb_obj_freeze(opt->script_name);
     {
 	long i;
 	VALUE load_path = GET_VM()->load_path;
@@ -1694,7 +1695,7 @@ void
 ruby_script(const char *name)
 {
     if (name) {
-	rb_progname = rb_obj_freeze(rb_external_str_new(name, strlen(name)));
+	rb_progname = rb_external_str_new(name, strlen(name));
 	rb_vm_set_progname(rb_progname);
     }
 }

test/-ext-/string/test_enc_associate.rb

@@ -0,0 +1,12 @@
+require 'test/unit'
+require "-test-/string/string"
+
+class Test_StrEncAssociate < Test::Unit::TestCase
+  def test_frozen
+    s = Bug::String.new("abc")
+    s.force_encoding(Encoding::US_ASCII)
+    s.freeze
+    assert_raise(RuntimeError) {s.associate_encoding!(Encoding::US_ASCII)}
+    assert_raise(RuntimeError) {s.associate_encoding!(Encoding::UTF_8)}
+  end
+end