merges r20905 from trunk into ruby_1_9_1.

* parse.y (gettable_gen): the encoding of __FILE__ should be
  rb_filesystem_encoding().  [ruby-list:45733]

* parse.y (gettable_gen): __FILE__ should be ASCII-8BIT when
  filesystem encoding is US-ASCII and __FILE__ contains non 7bit
  characters.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21071 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index bb9e81ce18..843f14fda1 100644
--- a/parse.y
+++ b/parse.y
@@ -7931,7 +7931,13 @@ gettable_gen(struct parser_params *parser, ID id)
 	return NEW_FALSE();
     }
     else if (id == keyword__FILE__) {
-	return NEW_STR(STR_NEW2(ruby_sourcefile));
+	VALUE str = rb_external_str_new_with_enc(ruby_sourcefile, strlen(ruby_sourcefile),
+						 rb_filesystem_encoding());
+	if (rb_enc_str_coderange(str) != ENC_CODERANGE_7BIT &&
+	    ENCODING_GET(str) == rb_usascii_encindex()) {
+	    rb_enc_associate(str, rb_ascii8bit_encoding());
+	}
+	return NEW_STR(str);
     }
     else if (id == keyword__LINE__) {
 	return NEW_LIT(INT2FIX(ruby_sourceline));