--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/code/pcDesc.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,61 @@
+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// PcDescs map a physical PC (given as offset from start of nmethod) to
+// the corresponding source scope and byte code index.
+
+class nmethod;
+
+class PcDesc VALUE_OBJ_CLASS_SPEC {
+  friend class VMStructs;
+ private:
+  int _pc_offset;           // offset from start of nmethod
+  int _scope_decode_offset; // offset for scope in nmethod
+  int _obj_decode_offset;
+
+ public:
+  int pc_offset() const           { return _pc_offset;   }
+  int scope_decode_offset() const { return _scope_decode_offset; }
+  int obj_decode_offset() const   { return _obj_decode_offset; }
+
+  void set_pc_offset(int x)           { _pc_offset           = x; }
+  void set_scope_decode_offset(int x) { _scope_decode_offset = x; }
+  void set_obj_decode_offset(int x)   { _obj_decode_offset   = x; }
+
+  // Constructor (only used for static in nmethod.cpp)
+  // Also used by ScopeDesc::sender()]
+  PcDesc(int pc_offset, int scope_decode_offset, int obj_decode_offset);
+
+  enum {
+    // upper and lower exclusive limits real offsets:
+    lower_offset_limit = -1,
+    upper_offset_limit = (unsigned int)-1 >> 1
+  };
+
+  // Returns the real pc
+  address real_pc(const nmethod* code) const;
+
+  void print(nmethod* code);
+  bool verify(nmethod* code);
+};