diff a/src/hotspot/share/code/relocInfo.cpp b/src/hotspot/share/code/relocInfo.cpp
--- a/src/hotspot/share/code/relocInfo.cpp
+++ b/src/hotspot/share/code/relocInfo.cpp
@@ -567,10 +567,33 @@
 
   _section = sindex;
   _target  = address_from_scaled_offset(offset, base);
 }
 
+void patchable_barrier_Relocation::pack_data_to(CodeSection* dest) {
+  short* p = (short*) dest->locs_end();
+  *p++ = relocInfo::data0_from_int(_metadata);
+  *p++ = relocInfo::data1_from_int(_metadata);
+  *p++ = relocInfo::data0_from_int(_target_offset);
+  *p++ = relocInfo::data1_from_int(_target_offset);
+  dest->set_locs_end((relocInfo*)p);
+}
+
+void patchable_barrier_Relocation::unpack_data() {
+  assert(datalen() == 4, "Should be two int fields");
+  short* d = data();
+  _metadata = relocInfo::jint_from_data(&d[0]);
+  _target_offset = relocInfo::jint_from_data(&d[2]);
+}
+
+void patchable_barrier_Relocation::set_target_offset(jint target_offset) {
+  assert(datalen() == 4, "Should be two int fields");
+  short* d = data();
+  d[2] = relocInfo::data0_from_int(target_offset);
+  d[3] = relocInfo::data1_from_int(target_offset);
+}
+
 //// miscellaneous methods
 oop* oop_Relocation::oop_addr() {
   int n = _oop_index;
   if (n == 0) {
     // oop is stored in the code stream