28 #include "gc/z/zLock.inline.hpp"
29 #include "gc/z/zOopClosures.hpp"
30 #include "gc/z/zNMethod.hpp"
31 #include "gc/z/zThreadLocalData.hpp"
32 #include "logging/log.hpp"
33
34 bool ZBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
35 ZLocker<ZReentrantLock> locker(ZNMethod::lock_for_nmethod(nm));
36 log_trace(nmethod, barrier)("Entered critical zone for %p", nm);
37
38 if (!is_armed(nm)) {
39 // Some other thread got here first and healed the oops
40 // and disarmed the nmethod.
41 return true;
42 }
43
44 if (nm->is_unloading()) {
45 // We don't need to take the lock when unlinking nmethods from
46 // the Method, because it is only concurrently unlinked by
47 // the entry barrier, which acquires the per nmethod lock.
48 nm->unlink_from_method(false /* acquire_lock */);
49
50 // We can end up calling nmethods that are unloading
51 // since we clear compiled ICs lazily. Returning false
52 // will re-resovle the call and update the compiled IC.
53 return false;
54 }
55
56 // Heal oops and disarm
57 ZNMethodOopClosure cl;
58 ZNMethod::nmethod_oops_do(nm, &cl);
59 disarm(nm);
60
61 return true;
62 }
63
64 int ZBarrierSetNMethod::disarmed_value() const {
65 // We override the default BarrierSetNMethod::disarmed_value() since
66 // this can be called by GC threads, which doesn't keep an up to date
67 // address_bad_mask.
68 const uintptr_t disarmed_addr = ((uintptr_t)&ZAddressBadMask) + ZNMethodDisarmedOffset;
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28 #include "gc/z/zLock.inline.hpp"
29 #include "gc/z/zOopClosures.hpp"
30 #include "gc/z/zNMethod.hpp"
31 #include "gc/z/zThreadLocalData.hpp"
32 #include "logging/log.hpp"
33
34 bool ZBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
35 ZLocker<ZReentrantLock> locker(ZNMethod::lock_for_nmethod(nm));
36 log_trace(nmethod, barrier)("Entered critical zone for %p", nm);
37
38 if (!is_armed(nm)) {
39 // Some other thread got here first and healed the oops
40 // and disarmed the nmethod.
41 return true;
42 }
43
44 if (nm->is_unloading()) {
45 // We don't need to take the lock when unlinking nmethods from
46 // the Method, because it is only concurrently unlinked by
47 // the entry barrier, which acquires the per nmethod lock.
48 nm->unlink_from_method();
49
50 // We can end up calling nmethods that are unloading
51 // since we clear compiled ICs lazily. Returning false
52 // will re-resovle the call and update the compiled IC.
53 return false;
54 }
55
56 // Heal oops and disarm
57 ZNMethodOopClosure cl;
58 ZNMethod::nmethod_oops_do(nm, &cl);
59 disarm(nm);
60
61 return true;
62 }
63
64 int ZBarrierSetNMethod::disarmed_value() const {
65 // We override the default BarrierSetNMethod::disarmed_value() since
66 // this can be called by GC threads, which doesn't keep an up to date
67 // address_bad_mask.
68 const uintptr_t disarmed_addr = ((uintptr_t)&ZAddressBadMask) + ZNMethodDisarmedOffset;
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