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
25 #ifndef SHARE_OOPS_INSTANCEOOP_HPP
26 #define SHARE_OOPS_INSTANCEOOP_HPP
27
28 #include "oops/oop.hpp"
29 #include <type_traits>
30
31 // An instanceOop is an instance of a Java Class
32 // Evaluating "new HashTable()" will create an instanceOop.
33
34 class instanceOopDesc : public oopDesc {
35 public:
36 // aligned header size.
37 static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; }
38
39 // If compressed, the offset of the fields of the instance may not be aligned.
40 static int base_offset_in_bytes() {
41 return (UseCompressedClassPointers) ?
42 klass_gap_offset_in_bytes() :
43 sizeof(instanceOopDesc);
44
45 }
46 };
47
48 // See similar requirement for oopDesc.
49 static_assert(std::is_trivially_default_constructible<instanceOopDesc>::value, "required");
50
51 #endif // SHARE_OOPS_INSTANCEOOP_HPP
|
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
25 #ifndef SHARE_OOPS_INSTANCEOOP_HPP
26 #define SHARE_OOPS_INSTANCEOOP_HPP
27
28 #include "oops/oop.hpp"
29 #include <type_traits>
30
31 // An instanceOop is an instance of a Java Class
32 // Evaluating "new HashTable()" will create an instanceOop.
33
34 class instanceOopDesc : public oopDesc {
35 public:
36 // If compressed, the offset of the fields of the instance may not be aligned.
37 static int base_offset_in_bytes() {
38 if (UseCompactObjectHeaders) {
39 return oopDesc::base_offset_in_bytes();
40 } else if (UseCompressedClassPointers) {
41 return klass_gap_offset_in_bytes();
42 } else {
43 return sizeof(instanceOopDesc);
44 }
45 }
46 };
47
48 // See similar requirement for oopDesc.
49 static_assert(std::is_trivially_default_constructible<instanceOopDesc>::value, "required");
50
51 #endif // SHARE_OOPS_INSTANCEOOP_HPP
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