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
25
26 #include "gc/shenandoah/shenandoahAsserts.hpp"
27 #include "gc/shenandoah/shenandoahForwarding.hpp"
28 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
29 #include "gc/shenandoah/shenandoahHeapRegionSet.inline.hpp"
30 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
31 #include "gc/shenandoah/shenandoahUtils.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "runtime/os.hpp"
35 #include "utilities/vmError.hpp"
36
37 void print_raw_memory(ShenandoahMessageBuffer &msg, void* loc) {
38 // Be extra safe. Only access data that is guaranteed to be safe:
39 // should be in heap, in known committed region, within that region.
40
41 ShenandoahHeap* heap = ShenandoahHeap::heap();
42 if (!heap->is_in_reserved(loc)) return;
43
44 ShenandoahHeapRegion* r = heap->heap_region_containing(loc);
45 if (r != nullptr && r->is_committed()) {
46 address start = MAX2((address) r->bottom(), (address) loc - 32);
47 address end = MIN2((address) r->end(), (address) loc + 128);
556 }
557 }
558
559 ShenandoahMessageBuffer msg("Must be either control thread, or vm thread");
560 if (at_safepoint) {
561 msg.append(" at a safepoint");
562 }
563 report_vm_error(file, line, msg.buffer());
564 }
565
566 bool ShenandoahAsserts::extract_klass_safely(oop obj, narrowKlass& nk, const Klass*& k) {
567 nk = 0;
568 k = nullptr;
569
570 if (!os::is_readable_pointer(obj)) {
571 return false;
572 }
573
574 if (UseCompactObjectHeaders) { // look in forwardee
575 markWord mark = obj->mark();
576 if (mark.is_marked()) {
577 oop fwd = cast_to_oop(mark.clear_lock_bits().to_pointer());
578 if (!os::is_readable_pointer(fwd)) {
579 return false;
580 }
581 mark = fwd->mark();
582 }
583 nk = mark.narrow_klass();
584 } else {
585 nk = obj->narrow_klass();
586 }
587 if (!CompressedKlassPointers::is_valid_narrow_klass_id(nk)) {
588 return false;
589 }
590 k = CompressedKlassPointers::decode_not_null_without_asserts(nk);
591
592 return k != nullptr;
593 }
|
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
25
26 #include "gc/shenandoah/shenandoahAsserts.hpp"
27 #include "gc/shenandoah/shenandoahForwarding.inline.hpp"
28 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
29 #include "gc/shenandoah/shenandoahHeapRegionSet.inline.hpp"
30 #include "gc/shenandoah/shenandoahMarkingContext.inline.hpp"
31 #include "gc/shenandoah/shenandoahUtils.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "runtime/os.hpp"
35 #include "utilities/vmError.hpp"
36
37 void print_raw_memory(ShenandoahMessageBuffer &msg, void* loc) {
38 // Be extra safe. Only access data that is guaranteed to be safe:
39 // should be in heap, in known committed region, within that region.
40
41 ShenandoahHeap* heap = ShenandoahHeap::heap();
42 if (!heap->is_in_reserved(loc)) return;
43
44 ShenandoahHeapRegion* r = heap->heap_region_containing(loc);
45 if (r != nullptr && r->is_committed()) {
46 address start = MAX2((address) r->bottom(), (address) loc - 32);
47 address end = MIN2((address) r->end(), (address) loc + 128);
556 }
557 }
558
559 ShenandoahMessageBuffer msg("Must be either control thread, or vm thread");
560 if (at_safepoint) {
561 msg.append(" at a safepoint");
562 }
563 report_vm_error(file, line, msg.buffer());
564 }
565
566 bool ShenandoahAsserts::extract_klass_safely(oop obj, narrowKlass& nk, const Klass*& k) {
567 nk = 0;
568 k = nullptr;
569
570 if (!os::is_readable_pointer(obj)) {
571 return false;
572 }
573
574 if (UseCompactObjectHeaders) { // look in forwardee
575 markWord mark = obj->mark();
576 if (ShenandoahForwarding::has_forwardee(mark)) {
577 oop fwd = cast_to_oop(mark.clear_lock_bits().to_pointer());
578 if (!os::is_readable_pointer(fwd)) {
579 return false;
580 }
581 mark = fwd->mark();
582 }
583 nk = mark.narrow_klass();
584 } else {
585 nk = obj->narrow_klass();
586 }
587 if (!CompressedKlassPointers::is_valid_narrow_klass_id(nk)) {
588 return false;
589 }
590 k = CompressedKlassPointers::decode_not_null_without_asserts(nk);
591
592 return k != nullptr;
593 }
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