< prev index next >

src/hotspot/share/gc/z/zBarrierSetNMethod.cpp

Print this page
rev 54621 : imported patch 8221734-v1


  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;


  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;
< prev index next >