Quelle test_nmt_cornercases.cpp Sprache: C

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* Copyright (c) 2022, 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.
*
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*/

#include "precompiled.hpp"
#include "memory/allocation.hpp"
#include "runtime/os.hpp"
#include "services/mallocHeader.inline.hpp"
#include "services/mallocTracker.hpp"
#include "services/memTracker.hpp"
#include "testutils.hpp"
#include "unittest.hpp"

// Check NMT header for integrity, as well as expected type and size.
static void check_expected_malloc_header(const void* payload, MEMFLAGS type, size_t size) {
  const MallocHeader* hdr = MallocTracker::malloc_header(payload);
  hdr->assert_block_integrity();
  EXPECT_EQ(hdr->size(), size);
  EXPECT_EQ(hdr->flags(), type);
}

// Check that a malloc with an overflowing size is rejected.
TEST_VM(NMT, malloc_failure1) {
  void* p = os::malloc(SIZE_MAX, mtTest);
  EXPECT_NULL(p);
}

// Check that gigantic mallocs are rejected, even if no size overflow happens.
TEST_VM(NMT, malloc_failure2) {
  void* p = os::malloc(SIZE_MAX - M, mtTest);
  EXPECT_NULL(p);
}

// Check correct handling of failing reallocs.
static void check_failing_realloc(size_t failing_request_size) {

  // We test this with both NMT enabled and disabled.
  bool nmt_enabled = MemTracker::enabled();
  const size_t first_size = 0x100;

  void* p = os::malloc(first_size, mtTest);
  EXPECT_NOT_NULL(p);
  if (nmt_enabled) {
    check_expected_malloc_header(p, mtTest, first_size);
  }
  GtestUtils::mark_range(p, first_size);

  // should fail
  void* p2 = os::realloc(p, failing_request_size, mtTest);
  EXPECT_NULL(p2);

  // original allocation should still be intact
  GtestUtils::check_range(p, first_size);
  if (nmt_enabled) {
    check_expected_malloc_header(p, mtTest, first_size);
  }

  os::free(p);
}

TEST_VM(NMT, realloc_failure_overflowing_size) {
  check_failing_realloc(SIZE_MAX);
  check_failing_realloc(SIZE_MAX - MemTracker::overhead_per_malloc());
}

TEST_VM(NMT, realloc_failure_gigantic_size) {
  check_failing_realloc(SIZE_MAX - M);
}

static void* do_realloc(void* p, size_t old_size, size_t new_size, uint8_t old_content, bool check_nmt_header) {

  EXPECT_NOT_NULL(p);
  if (check_nmt_header) {
    check_expected_malloc_header(p, mtTest, old_size);
  }

  void* p2 = os::realloc(p, new_size, mtTest);

  EXPECT_NOT_NULL(p2);
  if (check_nmt_header) {
    check_expected_malloc_header(p2, mtTest, new_size);
  }

  // Check old content, and possibly zapped area (if block grew)
  if (old_size < new_size) {
    GtestUtils::check_range((char*)p2, old_size, old_content);
#ifdef ASSERT
    GtestUtils::check_range((char*)p2 + old_size, new_size - old_size, uninitBlockPad);
#endif
  } else {
    GtestUtils::check_range((char*)p2, new_size, old_content);
  }

  return p2;
}

// Check a random sequence of reallocs. For enlarging reallocs, we expect the
// newly allocated memory to be zapped (in debug) while the old section should be
// left intact.
TEST_VM(NMT, random_reallocs) {

  bool nmt_enabled = MemTracker::enabled();
  size_t size = 256;
  uint8_t content = 'A';

  void* p = os::malloc(size, mtTest);
  ASSERT_NOT_NULL(p);
  if (nmt_enabled) {
    check_expected_malloc_header(p, mtTest, size);
  }
  GtestUtils::mark_range_with(p, size, content);

  for (int n = 0; n < 100; n ++) {
    size_t new_size = (size_t)(os::random() % 512) + 1;
    // LOG_HERE("reallocating " SIZE_FORMAT "->" SIZE_FORMAT, size, new_size);
    p = do_realloc(p, size, new_size, content, nmt_enabled);
    size = new_size;
    content = (n % 26) + 'A';
    GtestUtils::mark_range_with(p, size, content);
  }

  os::free(p);
}

TEST_VM(NMT, HeaderKeepsIntegrityAfterRevival) {
  if (!MemTracker::enabled()) {
    return;
  }
  size_t some_size = 16;
  void* p = os::malloc(some_size, mtTest);
  ASSERT_NOT_NULL(p) << "Failed to malloc()";
  MallocHeader* hdr = MallocTracker::malloc_header(p);
  hdr->mark_block_as_dead();
  hdr->revive();
  check_expected_malloc_header(p, mtTest, some_size);
}

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