From 1bc320c73a39ce7fb01ba2c1b609d7efce2bcf30 Mon Sep 17 00:00:00 2001
From: Albert Noll <anoll@openjdk.org>
Date: Tue, 9 Jul 2013 11:48:05 +0200
Subject: [PATCH] 8015635: Crash when specifying very large code cache size

Limit the size of the code cache to at most 2G when arguments are checked; added regression test

Reviewed-by: kvn, twisti
---
 hotspot/src/share/vm/runtime/arguments.cpp    | 14 +++++-
 .../compiler/codecache/CheckUpperLimit.java   | 47 +++++++++++++++++++
 2 files changed, 59 insertions(+), 2 deletions(-)
 create mode 100644 hotspot/test/compiler/codecache/CheckUpperLimit.java

diff --git a/hotspot/src/share/vm/runtime/arguments.cpp b/hotspot/src/share/vm/runtime/arguments.cpp
index c52959d6976..7f3e09c270c 100644
--- a/hotspot/src/share/vm/runtime/arguments.cpp
+++ b/hotspot/src/share/vm/runtime/arguments.cpp
@@ -1855,8 +1855,13 @@ bool Arguments::check_gc_consistency() {
                 "please refer to the release notes for the combinations "
                 "allowed\n");
     status = false;
+  } else if (ReservedCodeCacheSize > 2*G) {
+    // Code cache size larger than MAXINT is not supported.
+    jio_fprintf(defaultStream::error_stream(),
+                "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
+                (2*G)/M);
+    status = false;
   }
-
   return status;
 }
 
@@ -2239,8 +2244,13 @@ bool Arguments::check_vm_args_consistency() {
                 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
                 min_code_cache_size/K);
     status = false;
+  } else if (ReservedCodeCacheSize > 2*G) {
+    // Code cache size larger than MAXINT is not supported.
+    jio_fprintf(defaultStream::error_stream(),
+                "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
+                (2*G)/M);
+    status = false;
   }
-
   return status;
 }
 
diff --git a/hotspot/test/compiler/codecache/CheckUpperLimit.java b/hotspot/test/compiler/codecache/CheckUpperLimit.java
new file mode 100644
index 00000000000..5e4803226d5
--- /dev/null
+++ b/hotspot/test/compiler/codecache/CheckUpperLimit.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2013, 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 8015635
+ * @summary Test ensures that the ReservedCodeCacheSize is at most MAXINT
+ * @library /testlibrary
+ *
+ */
+import com.oracle.java.testlibrary.*;
+
+public class CheckUpperLimit {
+  public static void main(String[] args) throws Exception {
+    ProcessBuilder pb;
+    OutputAnalyzer out;
+
+    pb = ProcessTools.createJavaProcessBuilder("-XX:ReservedCodeCacheSize=2048m", "-version");
+    out = new OutputAnalyzer(pb.start());
+    out.shouldHaveExitValue(0);
+
+    pb = ProcessTools.createJavaProcessBuilder("-XX:ReservedCodeCacheSize=2049m", "-version");
+    out = new OutputAnalyzer(pb.start());
+    out.shouldContain("Invalid ReservedCodeCacheSize=");
+    out.shouldHaveExitValue(1);
+  }
+}