diff a/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/UnsetFieldsInfo.java b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/UnsetFieldsInfo.java
--- /dev/null
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/comp/UnsetFieldsInfo.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2024, 2025, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+package com.sun.tools.javac.comp;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.WeakHashMap;
+
+import com.sun.tools.javac.util.List;
+
+import com.sun.tools.javac.code.Symbol.ClassSymbol;
+import com.sun.tools.javac.code.Symbol.VarSymbol;
+import com.sun.tools.javac.tree.JCTree;
+import com.sun.tools.javac.util.Context;
+
+/**
+ * A Context class, that can keep useful information about unset fields.
+ * This information will be produced during flow analysis and used during
+ * code generation.
+ *
+ * <p><b>This is NOT part of any supported API.
+ * If you write code that depends on this, you do so at your own risk.
+ * This code and its internal interfaces are subject to change or
+ * deletion without notice.</b>
+ */
+public class UnsetFieldsInfo {
+    protected static final Context.Key<UnsetFieldsInfo> unsetFieldsInfoKey = new Context.Key<>();
+
+    public static UnsetFieldsInfo instance(Context context) {
+        UnsetFieldsInfo instance = context.get(unsetFieldsInfoKey);
+        if (instance == null)
+            instance = new UnsetFieldsInfo(context);
+        return instance;
+    }
+
+    @SuppressWarnings("this-escape")
+    protected UnsetFieldsInfo(Context context) {
+        context.put(unsetFieldsInfoKey, this);
+    }
+
+    private WeakHashMap<ClassSymbol, Map<JCTree, Set<VarSymbol>>> unsetFieldsMap = new WeakHashMap<>();
+
+    public void addUnsetFieldsInfo(ClassSymbol csym, JCTree tree, Set<VarSymbol> unsetFields) {
+        Map<JCTree, Set<VarSymbol>> treeToFieldsMap = unsetFieldsMap.get(csym);
+        if (treeToFieldsMap == null) {
+            treeToFieldsMap = new HashMap<>();
+            treeToFieldsMap.put(tree, unsetFields);
+            unsetFieldsMap.put(csym, treeToFieldsMap);
+        } else {
+            if (!treeToFieldsMap.containsKey(tree)) {
+                // only add if there is no info for the given tree
+                treeToFieldsMap.put(tree, unsetFields);
+            }
+        }
+    }
+
+    public Set<VarSymbol> getUnsetFields(ClassSymbol csym, JCTree tree) {
+        Map<JCTree, Set<VarSymbol>> treeToFieldsMap = unsetFieldsMap.get(csym);
+        if (treeToFieldsMap != null) {
+            Set<VarSymbol> result = treeToFieldsMap.get(tree);
+            if (result != null) {
+                return result;
+            }
+        }
+        return null;
+    }
+
+    public void removeUnsetFieldInfo(ClassSymbol csym, JCTree tree) {
+        Map<JCTree, Set<VarSymbol>> treeToFieldsMap = unsetFieldsMap.get(csym);
+        if (treeToFieldsMap != null) {
+            treeToFieldsMap.remove(tree);
+        }
+    }
+}
