[not part of build] base class for all references, provides interior …

…pointer detection.

gc/boehm/leaksoup/Reference.java

@@ -0,0 +1,87 @@
+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Patrick C. Beard <[email protected]>
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU Public License (the "GPL"), in which case the
+ * provisions of the GPL are applicable instead of those above.
+ * If you wish to allow use of your version of this file only
+ * under the terms of the GPL and not to allow others to use your
+ * version of this file under the NPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL.  If you do not delete
+ * the provisions above, a recipient may use your version of this
+ * file under either the NPL or the GPL.
+ */
+
+import java.util.*;
+import java.io.*;
+
+public class Reference {
+    int mAddress;
+    Type mType;
+    Object[] mReferences;
+
+    public Reference(String addr, Type type, Object[] refs) throws NumberFormatException {
+        mAddress = Integer.parseInt(addr.substring(2), 16);
+        mType = type;
+        mReferences = refs;
+    }
+
+    /**
+     * Tests whether ref is an interior pointer into this reference.
+     */
+    public boolean contains(long address) {
+        return (mAddress <= address && address < (mAddress + mType.mSize));
+    }
+
+	/**
+	 * Sorts in order of increasing addresses.
+	 */
+	public static class ByAddress extends QuickSort.Comparator {
+		public int compare(Object obj1, Object obj2) {
+			Reference r1 = (Reference) obj1, r2 = (Reference) obj2;
+			return (r1.mAddress - r2.mAddress);
+		}
+	}
+
+    public static Reference findNearest(Reference[] sortedRefs, int address) {
+		int length = sortedRefs.length;
+		int minIndex = 0, maxIndex = length - 1;
+		int index = maxIndex / 2;
+		while (minIndex <= maxIndex) {
+			Reference ref = sortedRefs[index];
+			if (address < ref.mAddress) {
+				maxIndex = (index - 1);
+				index = (minIndex + maxIndex) / 2;
+			} else {
+				if (address < (ref.mAddress + ref.mType.mSize)) {
+					return ref;
+				}
+				minIndex = (index + 1);
+				index = (minIndex + maxIndex) / 2;
+			}
+		}
+		return null;
+    }
+}