# HG changeset patch
# User bobv
# Date 1561562751 14400
# Node ID 0bf9477626efe3b1e840ad04382ef67d4b425bde
# Parent  b7f68ddec66f996ae3aad03291d129ca9f02482d
8224764: Create jtreg test for JDK-8222252
Reviewed-by: tschatzl

diff -r b7f68ddec66f -r 0bf9477626ef test/hotspot/jtreg/gc/arguments/TestMaxRAMFlags.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/gc/arguments/TestMaxRAMFlags.java	Wed Jun 26 11:25:51 2019 -0400
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+package gc.arguments;
+
+/*
+ * @test TestMaxRAMFlags
+ * @key gc
+ * @bug 8222252
+ * @summary Verify correct MaxHeapSize and UseCompressedOops when MaxRAM and MaxRAMPercentage
+ * are specified.
+ * @library /test/lib
+ * @library /
+ * @requires vm.bits == "64"
+ * @modules java.base/jdk.internal.misc
+ *          java.management
+ * @build sun.hotspot.WhiteBox
+ * @run driver ClassFileInstaller sun.hotspot.WhiteBox
+ *                              sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main gc.arguments.TestMaxRAMFlags
+ * @author bob.vandette@oracle.com
+ */
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+import jdk.test.lib.process.OutputAnalyzer;
+import jdk.test.lib.process.ProcessTools;
+
+public class TestMaxRAMFlags {
+
+  private static void checkMaxRAMSize(long maxram, int maxrampercent, boolean forcecoop, long expectheap, boolean expectcoop) throws Exception {
+
+    ArrayList<String> args = new ArrayList<String>();
+    args.add("-XX:MaxRAM=" + maxram);
+    args.add("-XX:MaxRAMPercentage=" + maxrampercent);
+    if (forcecoop) {
+      args.add("-XX:+UseCompressedOops");
+    }
+
+    args.add("-XX:+PrintFlagsFinal");
+    args.add("-version");
+
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[0]));
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldHaveExitValue(0);
+    String stdout = output.getStdout();
+
+    long actualheap = new Long(getFlagValue("MaxHeapSize", stdout)).longValue();
+    if (actualheap != expectheap) {
+      throw new RuntimeException("MaxHeapSize value set to " + actualheap +
+        ", expected " + expectheap + " when running with the following flags: " + Arrays.asList(args).toString());
+    }
+
+    boolean actualcoop = getFlagBoolValue("UseCompressedOops", stdout);
+    if (actualcoop != expectcoop) {
+      throw new RuntimeException("UseCompressedOops set to " + actualcoop +
+        ", expected " + expectcoop + " when running with the following flags: " + Arrays.asList(args).toString());
+    }
+  }
+
+  private static long getHeapBaseMinAddress() throws Exception {
+    ArrayList<String> args = new ArrayList<String>();
+    args.add("-XX:+PrintFlagsFinal");
+    args.add("-version");
+
+    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(args.toArray(new String[0]));
+    OutputAnalyzer output = new OutputAnalyzer(pb.start());
+    output.shouldHaveExitValue(0);
+    String stdout = output.getStdout();
+    return (new Long(getFlagValue("HeapBaseMinAddress", stdout)).longValue());
+  }
+
+  private static String getFlagValue(String flag, String where) {
+    Matcher m = Pattern.compile(flag + "\\s+:?=\\s+\\d+").matcher(where);
+    if (!m.find()) {
+      throw new RuntimeException("Could not find value for flag " + flag + " in output string");
+    }
+    String match = m.group();
+    return match.substring(match.lastIndexOf(" ") + 1, match.length());
+  }
+
+  private static boolean getFlagBoolValue(String flag, String where) {
+    Matcher m = Pattern.compile(flag + "\\s+:?= (true|false)").matcher(where);
+    if (!m.find()) {
+      throw new RuntimeException("Could not find value for flag " + flag + " in output string");
+    }
+    return m.group(1).equals("true");
+  }
+
+  public static void main(String args[]) throws Exception {
+    // Tests
+    // 1. Verify that MaxRAMPercentage overrides UseCompressedOops Ergo
+    // 2. Verify that UseCompressedOops forces compressed oops limit even
+    //    when other flags are specified.
+
+    long oneG = 1L * 1024L * 1024L * 1024L;
+
+    // Hotspot startup logic reduces MaxHeapForCompressedOops by HeapBaseMinAddress
+    // in order to get zero based compressed oops offsets.
+    long heapbaseminaddr = getHeapBaseMinAddress();
+    long maxcoopheap = TestUseCompressedOopsErgoTools.getMaxHeapForCompressedOops(new String [0]) - heapbaseminaddr;
+
+    // Args: MaxRAM , MaxRAMPercentage, forcecoop, expect heap, expect coop
+    checkMaxRAMSize(maxcoopheap - oneG, 100, false, maxcoopheap - oneG, true);
+    checkMaxRAMSize(maxcoopheap + oneG, 100, false, maxcoopheap + oneG, false);
+    checkMaxRAMSize(maxcoopheap + oneG, 100, true, maxcoopheap, true);
+  }
+}