From 7eac66b9c6a79a89900945e68e3eff457cf1cb7e Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 21 Oct 2009 20:17:27 +0000
Subject: [PATCH] * object.c (rb_obj_inspect): print instance variables only
 when   Object#to_s is not overridden.  [ruby-core:24425]

* class.c (rb_obj_basic_to_s_p): new function.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25428 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog |  7 +++++++
 class.c   | 10 ++++++++++
 object.c  |  8 ++++++--
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b8a5ddfc28..5f21c0be59 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Thu Oct 22 04:54:41 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* object.c (rb_obj_inspect): print instance variables only when
+	  Object#to_s is not overridden.  [ruby-core:24425]
+
+	* class.c (rb_obj_basic_to_s_p): new function.
+
 Wed Oct 21 19:32:52 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* object.c (rb_obj_inspect): fixed rdoc about the case that to_s
diff --git a/class.c b/class.c
index 865197b843..0f4394d97d 100644
--- a/class.c
+++ b/class.c
@@ -1257,6 +1257,16 @@ rb_define_attr(VALUE klass, const char *name, int read, int write)
     rb_attr(klass, rb_intern(name), read, write, FALSE);
 }
 
+int
+rb_obj_basic_to_s_p(obj)
+{
+    const rb_method_entry_t *me = rb_method_entry(CLASS_OF(obj), rb_intern("to_s"));
+    if (me && me->def && me->def->type == VM_METHOD_TYPE_CFUNC &&
+	me->def->body.cfunc.func == rb_any_to_s)
+	return 1;
+    return 0;
+}
+
 #include <stdarg.h>
 
 int
diff --git a/object.c b/object.c
index fc2c23716e..6e69343732 100644
--- a/object.c
+++ b/object.c
@@ -369,16 +369,19 @@ inspect_obj(VALUE obj, VALUE str, int recur)
  *  Returns a string containing a human-readable representation of
  *  <i>obj</i>. If not overridden and no instance variables, uses the
  *  <code>to_s</code> method to generate the string.
+ *  <i>obj</i>.  If not overridden, uses the <code>to_s</code> method to
+ *  generate the string.
  *
  *     [ 1, 2, 3..4, 'five' ].inspect   #=> "[1, 2, 3..4, \"five\"]"
  *     Time.new.inspect                 #=> "2008-03-08 19:43:39 +0900"
  */
 
+extern int rb_obj_basic_to_s_p(VALUE);
+
 static VALUE
 rb_obj_inspect(VALUE obj)
 {
-
-    if (TYPE(obj) == T_OBJECT) {
+    if (TYPE(obj) == T_OBJECT && rb_obj_basic_to_s_p(obj)) {
         int has_ivar = 0;
         VALUE *ptr = ROBJECT_IVPTR(obj);
         long len = ROBJECT_NUMIV(obj);
@@ -398,6 +401,7 @@ rb_obj_inspect(VALUE obj)
             str = rb_sprintf("-<%s:%p", c, (void*)obj);
             return rb_exec_recursive(inspect_obj, obj, str);
         }
+	return rb_any_to_s(obj);
     }
     return rb_funcall(obj, rb_intern("to_s"), 0, 0);
 }