8060449: Obsolete command line flags accept arbitrary appendix

Summary: Proper error messages for newly obsolete command line flags.
Reviewed-by: lfoltan, dcubed, coleenp
Contributed-by: max.ockner@oracle.com

hotspot/src/share/vm/runtime/arguments.cpp

@@ -327,9 +327,12 @@ bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
     const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
     // <flag>=xxx form
     // [-|+]<flag> form
-    if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
+    size_t len = strlen(flag_status.name);
+    if (((strncmp(flag_status.name, s, len) == 0) &&
+         (strlen(s) == len)) ||
         ((s[0] == '+' || s[0] == '-') &&
-        (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
+         (strncmp(flag_status.name, &s[1], len) == 0) &&
+         (strlen(&s[1]) == len))) {
       if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
           *version = flag_status.obsoleted_in;
           return true;
@@ -934,10 +937,18 @@ bool Arguments::process_argument(const char* arg,
     Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
     if (fuzzy_matched != NULL) {
       jio_fprintf(defaultStream::error_stream(),
-                  "Did you mean '%s%s%s'?\n",
+                  "Did you mean '%s%s%s'? ",
                   (fuzzy_matched->is_bool()) ? "(+/-)" : "",
                   fuzzy_matched->_name,
                   (fuzzy_matched->is_bool()) ? "" : "=<value>");
+      if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
+        char version[256];
+        since.to_string(version, sizeof(version));
+        jio_fprintf(defaultStream::error_stream(),
+                    "Warning: support for %s was removed in %s\n",
+                    fuzzy_matched->_name,
+                    version);
+      }
     }
   }
 

hotspot/test/runtime/CommandLine/ObsoleteFlagErrorMessage.java

+/*
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 8060449
+ * @summary Newly obsolete command line options should still give useful error messages when used improperly.
+ * @library /testlibrary
+ */
+
+import com.oracle.java.testlibrary.*;
+
+public class ObsoleteFlagErrorMessage {
+  public static void main(String[] args) throws Exception {
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+        "-XX:UseBoundThreadsPlusJunk", "-version");
+
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldContain("Unrecognized VM option 'UseBoundThreadsPlusJunk'"); // Must identify bad option.
+    output.shouldContain("UseBoundThreads"); // Should apply fuzzy matching to find correct option.
+    output.shouldContain("support").shouldContain("removed"); // Should warn user that the option they are trying to use is no longer supported.
+    output.shouldHaveExitValue(1);
+  }
+}