src/share/vm/memory/universe.hpp

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 175 
 176   static oop          _main_thread_group;             // Reference to the main thread group object
 177   static oop          _system_thread_group;           // Reference to the system thread group object
 178 
 179   static typeArrayOop _the_empty_byte_array;          // Canonicalized byte array
 180   static typeArrayOop _the_empty_short_array;         // Canonicalized short array
 181   static typeArrayOop _the_empty_int_array;           // Canonicalized int array
 182   static objArrayOop  _the_empty_system_obj_array;    // Canonicalized system obj array
 183   static objArrayOop  _the_empty_class_klass_array;   // Canonicalized obj array of type java.lang.Class
 184   static objArrayOop  _the_array_interfaces_array;    // Canonicalized 2-array of cloneable & serializable klasses
 185   static oop          _the_null_string;               // A cache of "null" as a Java string
 186   static oop          _the_min_jint_string;          // A cache of "-2147483648" as a Java string
 187   static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects
 188   static LatestMethodOopCache* _loader_addClass_cache;    // method for registering loaded classes in class loader vector
 189   static ActiveMethodOopsCache* _reflect_invoke_cache;    // method for security checks
 190   static oop          _out_of_memory_error_java_heap; // preallocated error object (no backtrace)
 191   static oop          _out_of_memory_error_perm_gen;  // preallocated error object (no backtrace)
 192   static oop          _out_of_memory_error_array_size;// preallocated error object (no backtrace)
 193   static oop          _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace)
 194 


 195   // array of preallocated error objects with backtrace
 196   static objArrayOop   _preallocated_out_of_memory_error_array;
 197 
 198   // number of preallocated error objects available for use
 199   static volatile jint _preallocated_out_of_memory_error_avail_count;
 200 
 201   static oop          _null_ptr_exception_instance;   // preallocated exception object
 202   static oop          _arithmetic_exception_instance; // preallocated exception object
 203   static oop          _virtual_machine_error_instance; // preallocated exception object
 204   // The object used as an exception dummy when exceptions are thrown for
 205   // the vm thread.
 206   static oop          _vm_exception;
 207 
 208   // The particular choice of collected heap.
 209   static CollectedHeap* _collectedHeap;
 210 
 211   // For UseCompressedOops.
 212   static struct NarrowOopStruct _narrow_oop;
 213 
 214   // array of dummy objects used with +FullGCAlot


 368   // 1 - Use zero based compressed oops with encoding when
 369   //     NarrowOopHeapBaseMin + heap_size < 32Gb
 370   // 2 - Use compressed oops with heap base + encoding.
 371   enum NARROW_OOP_MODE {
 372     UnscaledNarrowOop  = 0,
 373     ZeroBasedNarrowOop = 1,
 374     HeapBasedNarrowOop = 2
 375   };
 376   static char* preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode);
 377 
 378   // Historic gc information
 379   static size_t get_heap_capacity_at_last_gc()         { return _heap_capacity_at_last_gc; }
 380   static size_t get_heap_free_at_last_gc()             { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
 381   static size_t get_heap_used_at_last_gc()             { return _heap_used_at_last_gc; }
 382   static void update_heap_info_at_gc();
 383 
 384   // Testers
 385   static bool is_bootstrapping()                      { return _bootstrapping; }
 386   static bool is_fully_initialized()                  { return _fully_initialized; }
 387 




 388   static inline bool element_type_should_be_aligned(BasicType type);
 389   static inline bool field_type_should_be_aligned(BasicType type);
 390   static bool        on_page_boundary(void* addr);
 391   static bool        should_fill_in_stack_trace(Handle throwable);
 392   static void check_alignment(uintx size, uintx alignment, const char* name);
 393 
 394   // Finalizer support.
 395   static void run_finalizers_on_exit();
 396 
 397   // Iteration
 398 
 399   // Apply "f" to the addresses of all the direct heap pointers maintained
 400   // as static fields of "Universe".
 401   static void oops_do(OopClosure* f, bool do_all = false);
 402 
 403   // Apply "f" to all klasses for basic types (classes not present in
 404   // SystemDictionary).
 405   static void basic_type_classes_do(void f(klassOop));
 406 
 407   // Apply "f" to all system klasses (classes not present in SystemDictionary).




 175 
 176   static oop          _main_thread_group;             // Reference to the main thread group object
 177   static oop          _system_thread_group;           // Reference to the system thread group object
 178 
 179   static typeArrayOop _the_empty_byte_array;          // Canonicalized byte array
 180   static typeArrayOop _the_empty_short_array;         // Canonicalized short array
 181   static typeArrayOop _the_empty_int_array;           // Canonicalized int array
 182   static objArrayOop  _the_empty_system_obj_array;    // Canonicalized system obj array
 183   static objArrayOop  _the_empty_class_klass_array;   // Canonicalized obj array of type java.lang.Class
 184   static objArrayOop  _the_array_interfaces_array;    // Canonicalized 2-array of cloneable & serializable klasses
 185   static oop          _the_null_string;               // A cache of "null" as a Java string
 186   static oop          _the_min_jint_string;          // A cache of "-2147483648" as a Java string
 187   static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects
 188   static LatestMethodOopCache* _loader_addClass_cache;    // method for registering loaded classes in class loader vector
 189   static ActiveMethodOopsCache* _reflect_invoke_cache;    // method for security checks
 190   static oop          _out_of_memory_error_java_heap; // preallocated error object (no backtrace)
 191   static oop          _out_of_memory_error_perm_gen;  // preallocated error object (no backtrace)
 192   static oop          _out_of_memory_error_array_size;// preallocated error object (no backtrace)
 193   static oop          _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace)
 194 
 195   static oop          _primordial_loader_cache;       // Cache a ref to the primordial app loader to avoid searching for it
 196 
 197   // array of preallocated error objects with backtrace
 198   static objArrayOop   _preallocated_out_of_memory_error_array;
 199 
 200   // number of preallocated error objects available for use
 201   static volatile jint _preallocated_out_of_memory_error_avail_count;
 202 
 203   static oop          _null_ptr_exception_instance;   // preallocated exception object
 204   static oop          _arithmetic_exception_instance; // preallocated exception object
 205   static oop          _virtual_machine_error_instance; // preallocated exception object
 206   // The object used as an exception dummy when exceptions are thrown for
 207   // the vm thread.
 208   static oop          _vm_exception;
 209 
 210   // The particular choice of collected heap.
 211   static CollectedHeap* _collectedHeap;
 212 
 213   // For UseCompressedOops.
 214   static struct NarrowOopStruct _narrow_oop;
 215 
 216   // array of dummy objects used with +FullGCAlot


 370   // 1 - Use zero based compressed oops with encoding when
 371   //     NarrowOopHeapBaseMin + heap_size < 32Gb
 372   // 2 - Use compressed oops with heap base + encoding.
 373   enum NARROW_OOP_MODE {
 374     UnscaledNarrowOop  = 0,
 375     ZeroBasedNarrowOop = 1,
 376     HeapBasedNarrowOop = 2
 377   };
 378   static char* preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode);
 379 
 380   // Historic gc information
 381   static size_t get_heap_capacity_at_last_gc()         { return _heap_capacity_at_last_gc; }
 382   static size_t get_heap_free_at_last_gc()             { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }
 383   static size_t get_heap_used_at_last_gc()             { return _heap_used_at_last_gc; }
 384   static void update_heap_info_at_gc();
 385 
 386   // Testers
 387   static bool is_bootstrapping()                      { return _bootstrapping; }
 388   static bool is_fully_initialized()                  { return _fully_initialized; }
 389 
 390   // Used by JVM_LatestUserDefinedLoader to avoid stack walking to find the loader
 391   static oop get_cached_loader();
 392   static bool check_or_set_cached_loader(oop loader);        
 393 
 394   static inline bool element_type_should_be_aligned(BasicType type);
 395   static inline bool field_type_should_be_aligned(BasicType type);
 396   static bool        on_page_boundary(void* addr);
 397   static bool        should_fill_in_stack_trace(Handle throwable);
 398   static void check_alignment(uintx size, uintx alignment, const char* name);
 399 
 400   // Finalizer support.
 401   static void run_finalizers_on_exit();
 402 
 403   // Iteration
 404 
 405   // Apply "f" to the addresses of all the direct heap pointers maintained
 406   // as static fields of "Universe".
 407   static void oops_do(OopClosure* f, bool do_all = false);
 408 
 409   // Apply "f" to all klasses for basic types (classes not present in
 410   // SystemDictionary).
 411   static void basic_type_classes_do(void f(klassOop));
 412 
 413   // Apply "f" to all system klasses (classes not present in SystemDictionary).