< prev index next >

src/hotspot/share/oops/klass.inline.hpp

Print this page

 42   // Making the klass's CLD handle oops (e.g. the java_mirror), safe to store in the object
 43   // graph and its roots (e.g. Handles).
 44   static_cast<void>(klass_holder());
 45 }
 46 
 47 inline bool Klass::is_non_strong_hidden() const {
 48   return is_hidden() && class_loader_data()->has_class_mirror_holder();
 49 }
 50 
 51 // Iff the class loader (or mirror for non-strong hidden classes) is alive the
 52 // Klass is considered alive. This is safe to call before the CLD is marked as
 53 // unloading, and hence during concurrent class unloading.
 54 // This returns false if the Klass is unloaded, or about to be unloaded because the holder of
 55 // the CLD is no longer strongly reachable.
 56 // The return value of this function may change from true to false after a safepoint. So the caller
 57 // of this function must ensure that a safepoint doesn't happen while interpreting the return value.
 58 inline bool Klass::is_loader_alive() const {
 59   return class_loader_data()->is_alive();
 60 }
 61 















 62 inline bool Klass::is_loader_present_and_alive() const {
 63   ClassLoaderData* cld = class_loader_data();
 64   return (cld != nullptr) ? cld->is_alive() : false;
 65 }
 66 
 67 inline markWord Klass::prototype_header() const {
 68   assert(UseCompactObjectHeaders, "only use with compact object headers");
 69 #ifdef _LP64
 70   // You only need prototypes for allocating objects. If the class is not instantiable, it won't live in
 71   // class space and have no narrow Klass ID. But in that case we should not need the prototype.
 72   assert(_prototype_header.narrow_klass() > 0, "Klass " PTR_FORMAT ": invalid prototype (" PTR_FORMAT ")",
 73          p2i(this), _prototype_header.value());
 74 #endif
 75   return _prototype_header;
 76 }
 77 
 78 // This is only used when dumping the archive. In other cases,
 79 // the _prototype_header is already initialized to the right thing.
 80 inline void Klass::set_prototype_header(markWord header) {
 81   assert(UseCompactObjectHeaders, "only with compact headers");
 82   _prototype_header = header;
 83 }
 84 
 85 // Loading the java_mirror does not keep its holder alive. See Klass::keep_alive().
 86 inline oop Klass::java_mirror() const {
 87   return _java_mirror.resolve();
 88 }
 89 
 90 inline oop Klass::java_mirror_no_keepalive() const {
 91   return _java_mirror.peek();
 92 }
 93 
 94 inline klassVtable Klass::vtable() const {
 95   return klassVtable(const_cast<Klass*>(this), start_of_vtable(), vtable_length() / vtableEntry::size());
 96 }
 97 
 98 inline oop Klass::class_loader() const {
 99   return class_loader_data()->class_loader();
100 }
101 
102 inline vtableEntry* Klass::start_of_vtable() const {

 42   // Making the klass's CLD handle oops (e.g. the java_mirror), safe to store in the object
 43   // graph and its roots (e.g. Handles).
 44   static_cast<void>(klass_holder());
 45 }
 46 
 47 inline bool Klass::is_non_strong_hidden() const {
 48   return is_hidden() && class_loader_data()->has_class_mirror_holder();
 49 }
 50 
 51 // Iff the class loader (or mirror for non-strong hidden classes) is alive the
 52 // Klass is considered alive. This is safe to call before the CLD is marked as
 53 // unloading, and hence during concurrent class unloading.
 54 // This returns false if the Klass is unloaded, or about to be unloaded because the holder of
 55 // the CLD is no longer strongly reachable.
 56 // The return value of this function may change from true to false after a safepoint. So the caller
 57 // of this function must ensure that a safepoint doesn't happen while interpreting the return value.
 58 inline bool Klass::is_loader_alive() const {
 59   return class_loader_data()->is_alive();
 60 }
 61 
 62 inline markWord Klass::make_prototype_header(const Klass* kls, markWord prototype) {
 63   if (UseCompactObjectHeaders) {
 64     // With compact object headers, the narrow Klass ID is part of the mark word.
 65     // We therefore seed the mark word with the narrow Klass ID.
 66     precond(CompressedKlassPointers::is_encodable(kls));
 67     const narrowKlass nk = CompressedKlassPointers::encode(const_cast<Klass*>(kls));
 68     prototype = prototype.set_narrow_klass(nk);
 69   }
 70   return prototype;
 71 }
 72 
 73 inline void Klass::set_prototype_header(markWord header) {
 74   _prototype_header = header;
 75 }
 76 
 77 inline bool Klass::is_loader_present_and_alive() const {
 78   ClassLoaderData* cld = class_loader_data();
 79   return (cld != nullptr) ? cld->is_alive() : false;
 80 }
 81 
 82 inline markWord Klass::prototype_header() const {


 83   // You only need prototypes for allocating objects. If the class is not instantiable, it won't live in
 84   // class space and have no narrow Klass ID. But in that case we should not need the prototype.
 85   assert(!UseCompactObjectHeaders || _prototype_header.narrow_klass() > 0, "Klass " PTR_FORMAT ": invalid prototype (" PTR_FORMAT ")",
 86          p2i(this), _prototype_header.value());

 87   return _prototype_header;
 88 }
 89 
 90 inline void Klass::set_prototype_header_klass(narrowKlass klass) {
 91   // Merge narrowKlass in existing prototype header.
 92   _prototype_header = _prototype_header.set_narrow_klass(klass);


 93 }
 94 
 95 // Loading the java_mirror does not keep its holder alive. See Klass::keep_alive().
 96 inline oop Klass::java_mirror() const {
 97   return _java_mirror.resolve();
 98 }
 99 
100 inline oop Klass::java_mirror_no_keepalive() const {
101   return _java_mirror.peek();
102 }
103 
104 inline klassVtable Klass::vtable() const {
105   return klassVtable(const_cast<Klass*>(this), start_of_vtable(), vtable_length() / vtableEntry::size());
106 }
107 
108 inline oop Klass::class_loader() const {
109   return class_loader_data()->class_loader();
110 }
111 
112 inline vtableEntry* Klass::start_of_vtable() const {
< prev index next >