--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/utilities/CPPExpressions.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2004 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.
+ *
+ */
+
+package sun.jvm.hotspot.utilities;
+
+import java.util.regex.*;
+
+/** Provides helper routines for parsing simple C++ expressions such
+    as "(JavaThread *) 0xf00" and "Universe::_collectedHeap". */
+
+public class CPPExpressions {
+  private static Pattern castPattern;
+
+  /** Represents a cast expression such as "(JavaThread *)
+      0xf00". Returns both the type to which we are casting as well as
+      the address. */
+  public static class CastExpr {
+    private String type;
+    private String address;
+
+    private CastExpr(String type, String address) {
+      this.type = type;
+      this.address = address;
+    }
+
+    public String getType() {
+      return type;
+    }
+
+    public String getAddress() {
+      return address;
+    }
+  }
+
+  /** Represents a static field expression such as "Universe::_collectedHeap". */
+  public static class StaticFieldExpr {
+    private String containingType;
+    private String fieldName;
+
+    private StaticFieldExpr(String containingType, String fieldName) {
+      this.containingType = containingType;
+      this.fieldName = fieldName;
+    }
+
+    public String getContainingType() {
+      return containingType;
+    }
+
+    public String getFieldName() {
+      return fieldName;
+    }
+  }
+
+  /** Attempts to parse the given string into a CastExpr. Returns null
+      if the string did not match the supported pattern. */
+  public static CastExpr parseCast(String expr) {
+    if (castPattern == null) {
+      castPattern = Pattern.compile("\\s*\\(\\s*([0-9A-Za-z:_]*)\\s*\\*\\s*\\)\\s*([0-9a-zA-Z]*)\\s*");
+    }
+    Matcher matcher = castPattern.matcher(expr);
+    if (matcher.matches()) {
+      String type = matcher.group(1);
+      String addr = matcher.group(2);
+      return new CastExpr(type, addr);
+    }
+    return null;
+  }
+
+  /** Attempts to parse the given string into a
+      StaticFieldExpr. Returns null if the string did not match the
+      supported pattern. */
+  public static StaticFieldExpr parseStaticField(String expr) {
+    String sep = "::";
+    int idx = expr.lastIndexOf(sep);
+    if (idx < 0) {
+      return null;
+    }
+    String containingType = expr.substring(0, idx);
+    String fieldName = expr.substring(idx + sep.length(), expr.length());
+    return new StaticFieldExpr(containingType, fieldName);
+  }
+}