--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gpu/hsail/vm/gpu_hsail_OopMapHelper.hpp	Thu Jun 26 18:25:35 2014 +0200
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef GPU_HSAIL_VM_GPU_HSAIL_OOPMAPHELPER_HPP
+#define GPU_HSAIL_VM_GPU_HSAIL_OOPMAPHELPER_HPP
+
+#include "graal/graalEnv.hpp"
+#include "code/debugInfo.hpp"
+#include "code/location.hpp"
+
+// Takes the jobject for the array of ints created by the java side
+// and decodes the information based on pc_offset to find oops
+class HSAILOopMapHelper : public StackObj {
+private:
+  jobject _oop_map_array_jobject;
+  typeArrayOop _oop_map_array;
+  int _last_pcoffset;
+  int _last_idx;
+
+  enum {
+    SAVEAREACOUNTS_OFST=0,
+    SPAN_OFST=1,
+    HEADERSIZE=2
+  }; 
+  int mapPcOffsetToIndex(int pcOffset) {
+    if (pcOffset == _last_pcoffset) {
+      return _last_idx;
+    }
+    int span = _oop_map_array->int_at(SPAN_OFST);
+    for (int idx = HEADERSIZE; idx < _oop_map_array->length(); idx += span) {
+      int ofst = _oop_map_array->int_at(idx);
+      if (ofst == pcOffset) {
+        _last_pcoffset = pcOffset;
+        _last_idx = idx + 1;
+        return _last_idx;
+      }
+    }
+    ShouldNotReachHere();
+    return -1;
+  }
+
+public:
+  HSAILOopMapHelper(jobject oop_map_array_jobject) {
+    _oop_map_array_jobject = oop_map_array_jobject;
+    _last_pcoffset = -1;
+    resolve_arrays();
+  }
+ 
+  void resolve_arrays() {
+    _oop_map_array = (typeArrayOop) JNIHandles::resolve(_oop_map_array_jobject);
+  }
+
+  static int get_save_area_counts(jobject oop_map_array_jobject) {
+    typeArrayOop oop_map_array_resolved = (typeArrayOop) JNIHandles::resolve(oop_map_array_jobject);
+    return oop_map_array_resolved->int_at(SAVEAREACOUNTS_OFST);
+  }
+
+  bool is_oop(int pcOffset, int bit){
+    int bits_int_idx = mapPcOffsetToIndex(pcOffset) + (bit / 32);
+    int bitpos = bit % 32;
+    int bits = _oop_map_array->int_at(bits_int_idx);
+    return ((bits & (1 << bitpos)) != 0);
+  }
+
+};
+
+#endif // GPU_HSAIL_VM_GPU_HSAIL_OOPMAPHELPER_HPP