view src/share/vm/oops/arrayOop.cpp @ 2831:6fd81579526f

7102044: G1: VM crashes with assert(old_end != new_end) failed: don't call this otherwise Summary: arrayOopDesc::max_array_length() should return a value that does not overflow a size_t if it is converted to bytes. Reviewed-by: kvn, dholmes
author brutisso
date Mon, 31 Oct 2011 08:01:20 +0100
parents 1d1603768966
children 3c648b9ad052
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 * published by the Free Software Foundation.
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 * 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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 * questions.

#include "precompiled.hpp"

/////////////// Unit tests ///////////////

#ifndef PRODUCT

#include "oops/arrayOop.hpp"
#include "utilities/globalDefinitions.hpp"

bool arrayOopDesc::check_max_length_overflow(BasicType type) {
  julong length = max_array_length(type);
  julong bytes_per_element = type2aelembytes(type);
  julong bytes = length * bytes_per_element + header_size_in_bytes();
  return (julong)(size_t)bytes == bytes;

bool arrayOopDesc::test_max_array_length() {

  assert(check_max_length_overflow(T_BOOLEAN), "size_t overflow for boolean array");
  assert(check_max_length_overflow(T_CHAR), "size_t overflow for char array");
  assert(check_max_length_overflow(T_FLOAT), "size_t overflow for float array");
  assert(check_max_length_overflow(T_DOUBLE), "size_t overflow for double array");
  assert(check_max_length_overflow(T_BYTE), "size_t overflow for byte array");
  assert(check_max_length_overflow(T_SHORT), "size_t overflow for short array");
  assert(check_max_length_overflow(T_INT), "size_t overflow for int array");
  assert(check_max_length_overflow(T_LONG), "size_t overflow for long array");
  assert(check_max_length_overflow(T_OBJECT), "size_t overflow for object array");
  assert(check_max_length_overflow(T_ARRAY), "size_t overflow for array array");
  assert(check_max_length_overflow(T_NARROWOOP), "size_t overflow for narrowOop array");

  // T_VOID and T_ADDRESS are not supported by max_array_length()

  return true;

#endif //PRODUCT