diff --git a/ChangeLog b/ChangeLog
index 4e20aa5cd9..0995e0c1b7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+Tue Dec 10 11:20:56 2013  Aman Gupta <ruby@tmm1.net>
+
+	* ext/objspace/objspace_dump.c (dump_object): include fstring flag on
+	  strings. include gc flags (old, remembered, wb_protected) on all objects.
+	* ext/objspace/objspace_dump.c (Init_objspace_dump): initialize lazy
+	  IDs before first use.
+	* gc.c (rb_obj_gc_flags): new function to retrieve object flags
+	* internal.h (RB_OBJ_GC_FLAGS_MAX): maximum flags allowed for one obj
+	* test/objspace/test_objspace.rb (test_dump_flags): test for above
+	* test/objspace/test_objspace.rb (test_trace_object_allocations):
+	  resolve name before dump (for rb_class_path_cached)
+
 Tue Dec 10 07:48:29 2013  Aman Gupta <ruby@tmm1.net>
 
 	* vm_method.c (rb_clear_method_cache_by_class): fire
diff --git a/ext/objspace/objspace_dump.c b/ext/objspace/objspace_dump.c
index a9906b8538..9a694d33aa 100644
--- a/ext/objspace/objspace_dump.c
+++ b/ext/objspace/objspace_dump.c
@@ -20,6 +20,7 @@
 #include "node.h"
 #include "vm_core.h"
 #include "objspace.h"
+#include "internal.h"
 
 static VALUE sym_output, sym_stdout, sym_string, sym_file;
 
@@ -148,6 +149,8 @@ dump_object(VALUE obj, struct dump_config *dc)
     size_t memsize;
     struct allocation_info *ainfo;
     rb_io_t *fptr;
+    ID flags[RB_OBJ_GC_FLAGS_MAX];
+    size_t n, i;
 
     dc->cur_obj = obj;
     dc->cur_obj_references = 0;
@@ -175,6 +178,8 @@ dump_object(VALUE obj, struct dump_config *dc)
 	    dump_append(dc, ", \"associated\":true");
 	if (is_broken_string(obj))
 	    dump_append(dc, ", \"broken\":true");
+	if (FL_TEST(obj, RSTRING_FSTR))
+	    dump_append(dc, ", \"fstring\":true");
 	if (STR_SHARED_P(obj))
 	    dump_append(dc, ", \"shared\":true");
 	else {
@@ -249,6 +254,15 @@ dump_object(VALUE obj, struct dump_config *dc)
     if ((memsize = rb_obj_memsize_of(obj)) > 0)
 	dump_append(dc, ", \"memsize\":%"PRIuSIZE, memsize);
 
+    if ((n = rb_obj_gc_flags(obj, flags, sizeof(flags))) > 0) {
+	dump_append(dc, ", \"flags\":{");
+	for (i=0; i<n; i++) {
+	    dump_append(dc, "\"%s\":true", rb_id2name(flags[i]));
+	    if (i != n-1) dump_append(dc, ", ");
+	}
+	dump_append(dc, "}");
+    }
+
     dump_append(dc, "}\n");
 }
 
@@ -411,4 +425,7 @@ Init_objspace_dump(VALUE rb_mObjSpace)
     sym_stdout = ID2SYM(rb_intern("stdout"));
     sym_string = ID2SYM(rb_intern("string"));
     sym_file   = ID2SYM(rb_intern("file"));
+
+    /* force create static IDs */
+    rb_obj_gc_flags(rb_mObjSpace, 0, 0);
 }
diff --git a/gc.c b/gc.c
index 2083cc1027..3d6ca43e37 100644
--- a/gc.c
+++ b/gc.c
@@ -4749,6 +4749,53 @@ rb_obj_rgengc_promoted_p(VALUE obj)
     return OBJ_PROMOTED(obj) ? Qtrue : Qfalse;
 }
 
+size_t
+rb_obj_gc_flags(VALUE obj, ID* flags, size_t max)
+{
+    size_t n = 0;
+    static ID ID_marked;
+#if USE_RGENGC
+    static ID ID_wb_protected, ID_old, ID_remembered;
+#if RGENGC_THREEGEN
+    static ID ID_young, ID_infant;
+#endif
+#endif
+
+    if (!ID_marked) {
+#define I(s) ID_##s = rb_intern(#s);
+	I(marked);
+#if USE_RGENGC
+	I(wb_protected);
+	I(old);
+	I(remembered);
+#if RGENGC_THREEGEN
+	I(young);
+	I(infant);
+#endif
+#endif
+#undef I
+    }
+
+#if USE_RGENGC
+    if (OBJ_WB_PROTECTED(obj) && n<max)
+	flags[n++] = ID_wb_protected;
+    if (RVALUE_OLD_P(obj) && n<max)
+	flags[n++] = ID_old;
+#if RGENGC_THREEGEN
+    if (RVALUE_YOUNG_P(obj) && n<max)
+	flags[n++] = ID_young;
+    if (RVALUE_INFANT_P(obj) && n<max)
+	flags[n++] = ID_infant;
+#endif
+    if (MARKED_IN_BITMAP(GET_HEAP_REMEMBERSET_BITS(obj), obj) && n<max)
+	flags[n++] = ID_remembered;
+#endif
+    if (MARKED_IN_BITMAP(GET_HEAP_MARK_BITS(obj), obj) && n<max)
+	flags[n++] = ID_marked;
+
+    return n;
+}
+
 /* GC */
 
 void
diff --git a/internal.h b/internal.h
index 064f1a034a..9b8000d136 100644
--- a/internal.h
+++ b/internal.h
@@ -871,6 +871,8 @@ st_table *rb_st_copy(VALUE obj, struct st_table *orig_tbl);
 
 /* gc.c */
 size_t rb_obj_memsize_of(VALUE);
+#define RB_OBJ_GC_FLAGS_MAX 5
+size_t rb_obj_gc_flags(VALUE, ID[], size_t);
 
 RUBY_SYMBOL_EXPORT_END
 
diff --git a/test/objspace/test_objspace.rb b/test/objspace/test_objspace.rb
index 38fd9bd46f..42dc55de9f 100644
--- a/test/objspace/test_objspace.rb
+++ b/test/objspace/test_objspace.rb
@@ -130,6 +130,7 @@ class TestObjSpace < Test::Unit::TestCase
   end
 
   def test_trace_object_allocations
+    Class.name
     o0 = Object.new
     ObjectSpace.trace_object_allocations{
       o1 = Object.new; line1 = __LINE__; c1 = GC.count
@@ -193,6 +194,12 @@ class TestObjSpace < Test::Unit::TestCase
     assert_equal(nil, ObjectSpace.allocation_sourcefile(obj3))
   end
 
+  def test_dump_flags
+    info = ObjectSpace.dump("foo".freeze)
+    assert_match /"wb_protected":true, "old":true, "marked":true/, info
+    assert_match /"fstring":true/, info
+  end
+
   def test_dump_to_default
     line = nil
     info = nil