1 /*

     2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 #include "precompiled.hpp"

    25 

    26 // Included early because the NMT flags don't include it.

    27 #include "utilities/macros.hpp"

    28 

    29 #include "runtime/thread.hpp"

    30 #include "services/memTracker.hpp"

    31 #include "services/virtualMemoryTracker.hpp"

    32 #include "utilities/globalDefinitions.hpp"

    33 #include "unittest.hpp"

    34 

    35 

    36 class ThreadStackTrackingTest {

    37 public:

    38   static void test() {

    39     VirtualMemoryTracker::initialize(NMT_detail);

    40     VirtualMemoryTracker::late_initialize(NMT_detail);

    41 

    42     Thread* thr = Thread::current();

    43     address stack_end = thr->stack_end();

    44     size_t  stack_size = thr->stack_size();

    45 

    46     MemTracker::record_thread_stack(stack_end, stack_size);

    47 

    48     VirtualMemoryTracker::add_reserved_region(stack_end, stack_size, CALLER_PC, mtThreadStack);

    49 

    50     // snapshot current stack usage

    51     VirtualMemoryTracker::snapshot_thread_stacks();

    52 

    53     ReservedMemoryRegion* rmr = VirtualMemoryTracker::_reserved_regions->find(ReservedMemoryRegion(stack_end, stack_size));

    54     ASSERT_TRUE(rmr != NULL);

    55 

    56     ASSERT_EQ(rmr->base(), stack_end);

    57     ASSERT_EQ(rmr->size(), stack_size);

    58 

    59     CommittedRegionIterator iter = rmr->iterate_committed_regions();

    60     int i = 0;

    61     address i_addr = (address)&i;

    62 

    63     // stack grows downward

    64     address stack_top = stack_end + stack_size;

    65     bool found_stack_top = false;

    66 

    67     for (const CommittedMemoryRegion* region = iter.next(); region != NULL; region = iter.next()) {

    68       if (region->base() + region->size() == stack_top) {

    69         // This should be active part, "i" should be here

    70         ASSERT_TRUE(i_addr < stack_top && i_addr >= region->base());

    71         ASSERT_TRUE(region->size() <= stack_size);

    72         found_stack_top = true;

    73       }

    74 

    75       i++;

    76     }

    77 

    78     // NMT was not turned on when the thread was created, so we don't have guard pages

    79     ASSERT_TRUE(i == 1);

    80     ASSERT_TRUE(found_stack_top);

    81   }

    82 };

    83 

    84 TEST_VM(VirtualMemoryTracker, thread_stack_tracking) {

    85   ThreadStackTrackingTest::test();

    86 }