< prev index next >

src/share/vm/classfile/moduleEntry.cpp

Print this page




  63     }
  64   }
  65   return false;
  66 }
  67 
  68 void ModuleEntry::set_version(Symbol* version) {
  69   if (_version != NULL) {
  70     // _version symbol's refcounts are managed by ModuleEntry,
  71     // must decrement the old one before updating.
  72     _version->decrement_refcount();
  73   }
  74 
  75   _version = version;
  76 
  77   if (version != NULL) {
  78     version->increment_refcount();
  79   }
  80 }
  81 
  82 // Returns the shared ProtectionDomain
  83 Handle ModuleEntry::shared_protection_domain() {
  84   return Handle(Thread::current(), JNIHandles::resolve(_pd));
  85 }
  86 
  87 // Set the shared ProtectionDomain atomically
  88 void ModuleEntry::set_shared_protection_domain(ClassLoaderData *loader_data,
  89                                                Handle pd_h) {
  90   // Create a handle for the shared ProtectionDomain and save it atomically.
  91   // If someone beats us setting the _pd cache, the created handle is destroyed.
  92   jobject obj = loader_data->add_handle(pd_h);
  93   if (Atomic::cmpxchg_ptr(obj, &_pd, NULL) != NULL) {
  94     loader_data->remove_handle_unsafe(obj);
  95   }
  96 }
  97 
  98 // Returns true if this module can read module m
  99 bool ModuleEntry::can_read(ModuleEntry* m) const {
 100   assert(m != NULL, "No module to lookup in this module's reads list");
 101 
 102   // Unnamed modules read everyone and all modules
 103   // read java.base.  If either of these conditions
 104   // hold, readability has been established.
 105   if (!this->is_named() ||
 106       (m == ModuleEntryTable::javabase_moduleEntry())) {
 107     return true;
 108   }
 109 
 110   MutexLocker m1(Module_lock);
 111   // This is a guard against possible race between agent threads that redefine
 112   // or retransform classes in this module. Only one of them is adding the
 113   // default read edges to the unnamed modules of the boot and app class loaders




  63     }
  64   }
  65   return false;
  66 }
  67 
  68 void ModuleEntry::set_version(Symbol* version) {
  69   if (_version != NULL) {
  70     // _version symbol's refcounts are managed by ModuleEntry,
  71     // must decrement the old one before updating.
  72     _version->decrement_refcount();
  73   }
  74 
  75   _version = version;
  76 
  77   if (version != NULL) {
  78     version->increment_refcount();
  79   }
  80 }
  81 
  82 // Returns the shared ProtectionDomain
  83 oop ModuleEntry::shared_protection_domain() {
  84   return _pd.resolve_acquire();
  85 }
  86 
  87 // Set the shared ProtectionDomain atomically
  88 void ModuleEntry::set_shared_protection_domain(ClassLoaderData *loader_data,
  89                                                Handle pd_h) {
  90   // Create a handle for the shared ProtectionDomain and save it atomically.
  91   // If someone beats us setting the _pd cache, the created handle is destroyed.
  92   OopHandle obj = loader_data->add_handle(pd_h);
  93   if (!_pd.set_atomic(obj)) {
  94     loader_data->remove_handle_unsafe(obj);
  95   }
  96 }
  97 
  98 // Returns true if this module can read module m
  99 bool ModuleEntry::can_read(ModuleEntry* m) const {
 100   assert(m != NULL, "No module to lookup in this module's reads list");
 101 
 102   // Unnamed modules read everyone and all modules
 103   // read java.base.  If either of these conditions
 104   // hold, readability has been established.
 105   if (!this->is_named() ||
 106       (m == ModuleEntryTable::javabase_moduleEntry())) {
 107     return true;
 108   }
 109 
 110   MutexLocker m1(Module_lock);
 111   // This is a guard against possible race between agent threads that redefine
 112   // or retransform classes in this module. Only one of them is adding the
 113   // default read edges to the unnamed modules of the boot and app class loaders


< prev index next >