Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 // Universe is a name space holding known system classes and objects in the VM.

 //

 // Loaded classes are accessible through the SystemDictionary.

 //

 // The object heap is allocated and accessed through Universe, and various allocation

 // support is provided. Allocation by the interpreter and compiled code is done inline

 // and bails out to Scavenge::invoke_and_allocate.

 class CollectedHeap;

 class DeferredObjAllocEvent;

 // Common parts of a methodOop cache. This cache safely interacts with

 // the RedefineClasses API.

 //

 class CommonMethodOopCache : public CHeapObj {

   // We save the klassOop and the idnum of methodOop in order to get

   // the current cached methodOop.

  private:

   klassOop              _klass;

   int                   _method_idnum;

  public:

   CommonMethodOopCache()   { _klass = NULL; _method_idnum = -1; }

   ~CommonMethodOopCache()  { _klass = NULL; _method_idnum = -1; }

   void     init(klassOop k, methodOop m, TRAPS);

   klassOop klass() const         { return _klass; }

   int      method_idnum() const  { return _method_idnum; }

   // GC support

   void     oops_do(OopClosure* f)  { f->do_oop((oop*)&_klass); }

 };

 // A helper class for caching a methodOop when the user of the cache

 // cares about all versions of the methodOop.

 //

 class ActiveMethodOopsCache : public CommonMethodOopCache {

   // This subclass adds weak references to older versions of the

   // methodOop and a query method for a methodOop.

  private:

   // If the cached methodOop has not been redefined, then

   // _prev_methods will be NULL. If all of the previous

   // versions of the method have been collected, then

   // _prev_methods can have a length of zero.

   GrowableArray<jweak>* _prev_methods;

  public:

   ActiveMethodOopsCache()   { _prev_methods = NULL; }

   ~ActiveMethodOopsCache();

   void add_previous_version(const methodOop method);

   bool is_same_method(const methodOop method) const;

 };

 // A helper class for caching a methodOop when the user of the cache

 // only cares about the latest version of the methodOop.

 //

 class LatestMethodOopCache : public CommonMethodOopCache {

   // This subclass adds a getter method for the latest methodOop.

  public:

   methodOop get_methodOop();

 };

 // For UseCompressedOops.

 struct NarrowOopStruct {

   // Base address for oop-within-java-object materialization.

   // NULL if using wide oops or zero based narrow oops.

   address _base;

   // Number of shift bits for encoding/decoding narrow oops.

   // 0 if using wide oops or zero based unscaled narrow oops,

   // LogMinObjAlignmentInBytes otherwise.

   int     _shift;

   // Generate code with implicit null checks for narrow oops.

   bool    _use_implicit_null_checks;

 };

 class Universe: AllStatic {

   // Ugh.  Universe is much too friendly.

   friend class MarkSweep;

   friend class oopDesc;

   friend class ClassLoader;

   friend class Arguments;

   friend class SystemDictionary;

   friend class VMStructs;

   friend class CompactingPermGenGen;

   friend class VM_PopulateDumpSharedSpace;

   friend jint  universe_init();

   friend void  universe2_init();

   friend bool  universe_post_init();

  private:

   // Known classes in the VM

   static klassOop _boolArrayKlassObj;

   static klassOop _byteArrayKlassObj;

   static klassOop _charArrayKlassObj;

   static klassOop _intArrayKlassObj;

   static klassOop _shortArrayKlassObj;

   static klassOop _longArrayKlassObj;

   static klassOop _singleArrayKlassObj;

   static klassOop _doubleArrayKlassObj;

   static klassOop _typeArrayKlassObjs[T_VOID+1];

   static klassOop _objectArrayKlassObj;

   static klassOop _symbolKlassObj;

   static klassOop _methodKlassObj;

   static klassOop _constMethodKlassObj;

   static klassOop _methodDataKlassObj;

   static klassOop _klassKlassObj;

   static klassOop _arrayKlassKlassObj;

   static klassOop _objArrayKlassKlassObj;

   static klassOop _typeArrayKlassKlassObj;

   static klassOop _instanceKlassKlassObj;

   static klassOop _constantPoolKlassObj;

   static klassOop _constantPoolCacheKlassObj;

   static klassOop _compiledICHolderKlassObj;

   static klassOop _systemObjArrayKlassObj;

   // Known objects in the VM

   // Primitive objects

   static oop _int_mirror;

   static oop _float_mirror;

   static oop _double_mirror;

   static oop _byte_mirror;

   static oop _bool_mirror;

   static oop _char_mirror;

   static oop _long_mirror;

   static oop _short_mirror;

   static oop _void_mirror;

   static oop          _main_thread_group;             // Reference to the main thread group object

   static oop          _system_thread_group;           // Reference to the system thread group object

   static typeArrayOop _the_empty_byte_array;          // Canonicalized byte array

   static typeArrayOop _the_empty_short_array;         // Canonicalized short array

   static typeArrayOop _the_empty_int_array;           // Canonicalized int array

   static objArrayOop  _the_empty_system_obj_array;    // Canonicalized system obj array

   static objArrayOop  _the_empty_class_klass_array;   // Canonicalized obj array of type java.lang.Class

   static objArrayOop  _the_array_interfaces_array;    // Canonicalized 2-array of cloneable & serializable klasses

   static oop          _the_null_string;               // A cache of "null" as a Java string

   static oop          _the_min_jint_string;          // A cache of "-2147483648" as a Java string

   static LatestMethodOopCache* _finalizer_register_cache; // static method for registering finalizable objects

   static LatestMethodOopCache* _loader_addClass_cache;    // method for registering loaded classes in class loader vector

   static ActiveMethodOopsCache* _reflect_invoke_cache;    // method for security checks

   static oop          _out_of_memory_error_java_heap; // preallocated error object (no backtrace)

   static oop          _out_of_memory_error_perm_gen;  // preallocated error object (no backtrace)

   static oop          _out_of_memory_error_array_size;// preallocated error object (no backtrace)

   static oop          _out_of_memory_error_gc_overhead_limit; // preallocated error object (no backtrace)

   // array of preallocated error objects with backtrace

   static objArrayOop   _preallocated_out_of_memory_error_array;

   // number of preallocated error objects available for use

   static volatile jint _preallocated_out_of_memory_error_avail_count;

   static oop          _null_ptr_exception_instance;   // preallocated exception object

   static oop          _arithmetic_exception_instance; // preallocated exception object

   static oop          _virtual_machine_error_instance; // preallocated exception object

   // The object used as an exception dummy when exceptions are thrown for

   // the vm thread.

   static oop          _vm_exception;

   static oop          _emptySymbol;                   // Canonical empty string ("") symbol

   // The particular choice of collected heap.

   static CollectedHeap* _collectedHeap;

   // For UseCompressedOops.

   static struct NarrowOopStruct _narrow_oop;

   // array of dummy objects used with +FullGCAlot

   debug_only(static objArrayOop _fullgc_alot_dummy_array;)

   // index of next entry to clear

   debug_only(static int         _fullgc_alot_dummy_next;)

   // Compiler/dispatch support

   static int  _base_vtable_size;                      // Java vtbl size of klass Object (in words)

   // Initialization

   static bool _bootstrapping;                         // true during genesis

   static bool _fully_initialized;                     // true after universe_init and initialize_vtables called

   // the array of preallocated errors with backtraces

   static objArrayOop  preallocated_out_of_memory_errors()     { return _preallocated_out_of_memory_error_array; }

   // generate an out of memory error; if possible using an error with preallocated backtrace;

   // otherwise return the given default error.

   static oop        gen_out_of_memory_error(oop default_err);

   // Historic gc information

   static size_t _heap_capacity_at_last_gc;

   static size_t _heap_used_at_last_gc;

   static jint initialize_heap();

   static void initialize_basic_type_mirrors(TRAPS);

   static void fixup_mirrors(TRAPS);

   static void reinitialize_vtable_of(KlassHandle h_k, TRAPS);

   static void reinitialize_itables(TRAPS);

   static void compute_base_vtable_size();             // compute vtable size of class Object

   static void genesis(TRAPS);                         // Create the initial world

   // Mirrors for primitive classes (created eagerly)

   static oop check_mirror(oop m) {

     assert(m != NULL, "mirror not initialized");

     return m;

   }

   // Debugging

   static int _verify_count;                           // number of verifies done

   // True during call to verify().  Should only be set/cleared in verify().

   static bool _verify_in_progress;

   static void compute_verify_oop_data();

  public:

   // Known classes in the VM

   static klassOop boolArrayKlassObj()                 { return _boolArrayKlassObj;   }

   static klassOop byteArrayKlassObj()                 { return _byteArrayKlassObj;   }

   static klassOop charArrayKlassObj()                 { return _charArrayKlassObj;   }

   static klassOop intArrayKlassObj()                  { return _intArrayKlassObj;    }

   static klassOop shortArrayKlassObj()                { return _shortArrayKlassObj;  }

   static klassOop longArrayKlassObj()                 { return _longArrayKlassObj;   }

   static klassOop singleArrayKlassObj()               { return _singleArrayKlassObj; }

   static klassOop doubleArrayKlassObj()               { return _doubleArrayKlassObj; }

   static klassOop objectArrayKlassObj() {

     return _objectArrayKlassObj;

   }

   static klassOop typeArrayKlassObj(BasicType t) {

     assert((uint)t < T_VOID+1, "range check");

     assert(_typeArrayKlassObjs[t] != NULL, "domain check");

     return _typeArrayKlassObjs[t];

   }

   static klassOop symbolKlassObj()                    { return _symbolKlassObj;            }

   static klassOop methodKlassObj()                    { return _methodKlassObj;            }

   static klassOop constMethodKlassObj()               { return _constMethodKlassObj;         }

   static klassOop methodDataKlassObj()                { return _methodDataKlassObj;        }

   static klassOop klassKlassObj()                     { return _klassKlassObj;             }

   static klassOop arrayKlassKlassObj()                { return _arrayKlassKlassObj;        }

   static klassOop objArrayKlassKlassObj()             { return _objArrayKlassKlassObj;     }

   static klassOop typeArrayKlassKlassObj()            { return _typeArrayKlassKlassObj;    }

   static klassOop instanceKlassKlassObj()             { return _instanceKlassKlassObj;     }

   static klassOop constantPoolKlassObj()              { return _constantPoolKlassObj;      }

   static klassOop constantPoolCacheKlassObj()         { return _constantPoolCacheKlassObj; }

   static klassOop compiledICHolderKlassObj()          { return _compiledICHolderKlassObj;  }

   static klassOop systemObjArrayKlassObj()            { return _systemObjArrayKlassObj;    }

   // Known objects in tbe VM

   static oop int_mirror()                   { return check_mirror(_int_mirror);

 }

   static oop float_mirror()                 { return check_mirror(_float_mirror); }

   static oop double_mirror()                { return check_mirror(_double_mirror); }

   static oop byte_mirror()                  { return check_mirror(_byte_mirror); }

   static oop bool_mirror()                  { return check_mirror(_bool_mirror); }

   static oop char_mirror()                  { return check_mirror(_char_mirror); }

   static oop long_mirror()                  { return check_mirror(_long_mirror); }

   static oop short_mirror()                 { return check_mirror(_short_mirror); }

   static oop void_mirror()                  { return check_mirror(_void_mirror); }

   // table of same

   static oop _mirrors[T_VOID+1];

   static oop java_mirror(BasicType t) {

     assert((uint)t < T_VOID+1, "range check");

     return check_mirror(_mirrors[t]);

   }

   static oop      main_thread_group()                 { return _main_thread_group; }

   static void set_main_thread_group(oop group)        { _main_thread_group = group;}

   static oop      system_thread_group()               { return _system_thread_group; }

   static void set_system_thread_group(oop group)      { _system_thread_group = group;}

   static typeArrayOop the_empty_byte_array()          { return _the_empty_byte_array;          }

   static typeArrayOop the_empty_short_array()         { return _the_empty_short_array;         }

   static typeArrayOop the_empty_int_array()           { return _the_empty_int_array;           }

   static objArrayOop  the_empty_system_obj_array ()   { return _the_empty_system_obj_array;    }

   static objArrayOop  the_empty_class_klass_array ()  { return _the_empty_class_klass_array;   }

   static objArrayOop  the_array_interfaces_array()    { return _the_array_interfaces_array;    }

   static oop          the_null_string()               { return _the_null_string;               }

   static oop          the_min_jint_string()          { return _the_min_jint_string;          }

   static methodOop    finalizer_register_method()     { return _finalizer_register_cache->get_methodOop(); }

   static methodOop    loader_addClass_method()        { return _loader_addClass_cache->get_methodOop(); }

   static ActiveMethodOopsCache* reflect_invoke_cache() { return _reflect_invoke_cache; }

   static oop          null_ptr_exception_instance()   { return _null_ptr_exception_instance;   }

   static oop          arithmetic_exception_instance() { return _arithmetic_exception_instance; }

   static oop          virtual_machine_error_instance() { return _virtual_machine_error_instance; }

   static oop          vm_exception()                  { return _vm_exception; }

   static oop          emptySymbol()                   { return _emptySymbol; }

   // OutOfMemoryError support. Returns an error with the required message. The returned error

   // may or may not have a backtrace. If error has a backtrace then the stack trace is already

   // filled in.

   static oop out_of_memory_error_java_heap()          { return gen_out_of_memory_error(_out_of_memory_error_java_heap);  }

   static oop out_of_memory_error_perm_gen()           { return gen_out_of_memory_error(_out_of_memory_error_perm_gen);   }

   static oop out_of_memory_error_array_size()         { return gen_out_of_memory_error(_out_of_memory_error_array_size); }

   static oop out_of_memory_error_gc_overhead_limit()  { return gen_out_of_memory_error(_out_of_memory_error_gc_overhead_limit);  }

   // Accessors needed for fast allocation

   static klassOop* boolArrayKlassObj_addr()           { return &_boolArrayKlassObj;   }

   static klassOop* byteArrayKlassObj_addr()           { return &_byteArrayKlassObj;   }

   static klassOop* charArrayKlassObj_addr()           { return &_charArrayKlassObj;   }

   static klassOop* intArrayKlassObj_addr()            { return &_intArrayKlassObj;    }

   static klassOop* shortArrayKlassObj_addr()          { return &_shortArrayKlassObj;  }

   static klassOop* longArrayKlassObj_addr()           { return &_longArrayKlassObj;   }

   static klassOop* singleArrayKlassObj_addr()         { return &_singleArrayKlassObj; }

   static klassOop* doubleArrayKlassObj_addr()         { return &_doubleArrayKlassObj; }

   // The particular choice of collected heap.

   static CollectedHeap* heap() { return _collectedHeap; }

   // For UseCompressedOops

   static address* narrow_oop_base_addr()              { return &_narrow_oop._base; }

   static address  narrow_oop_base()                   { return  _narrow_oop._base; }

   static bool  is_narrow_oop_base(void* addr)         { return (narrow_oop_base() == (address)addr); }

   static int      narrow_oop_shift()                  { return  _narrow_oop._shift; }

   static void     set_narrow_oop_base(address base)   { _narrow_oop._base  = base; }

   static void     set_narrow_oop_shift(int shift)     { _narrow_oop._shift = shift; }

   static bool     narrow_oop_use_implicit_null_checks()             { return  _narrow_oop._use_implicit_null_checks; }

   static void     set_narrow_oop_use_implicit_null_checks(bool use) { _narrow_oop._use_implicit_null_checks = use; }

   // Narrow Oop encoding mode:

   // 0 - Use 32-bits oops without encoding when

   //     NarrowOopHeapBaseMin + heap_size < 4Gb

   // 1 - Use zero based compressed oops with encoding when

   //     NarrowOopHeapBaseMin + heap_size < 32Gb

   // 2 - Use compressed oops with heap base + encoding.

   enum NARROW_OOP_MODE {

     UnscaledNarrowOop  = 0,

     ZeroBasedNarrowOop = 1,

     HeapBasedNarrowOop = 2

   };

   static char* preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode);

   // Historic gc information

   static size_t get_heap_capacity_at_last_gc()         { return _heap_capacity_at_last_gc; }

   static size_t get_heap_free_at_last_gc()             { return _heap_capacity_at_last_gc - _heap_used_at_last_gc; }

   static size_t get_heap_used_at_last_gc()             { return _heap_used_at_last_gc; }

   static void update_heap_info_at_gc();

   // Testers

   static bool is_bootstrapping()                      { return _bootstrapping; }

   static bool is_fully_initialized()                  { return _fully_initialized; }

   static inline bool element_type_should_be_aligned(BasicType type);

   static inline bool field_type_should_be_aligned(BasicType type);

   static bool        on_page_boundary(void* addr);

   static bool        should_fill_in_stack_trace(Handle throwable);

   static void check_alignment(uintx size, uintx alignment, const char* name);

   // Finalizer support.

   static void run_finalizers_on_exit();

   // Iteration

   // Apply "f" to the addresses of all the direct heap pointers maintained

   // as static fields of "Universe".

   static void oops_do(OopClosure* f, bool do_all = false);

   // Apply "f" to all klasses for basic types (classes not present in

   // SystemDictionary).

   static void basic_type_classes_do(void f(klassOop));

   // Apply "f" to all system klasses (classes not present in SystemDictionary).

   static void system_classes_do(void f(klassOop));

   // For sharing -- fill in a list of known vtable pointers.

   static void init_self_patching_vtbl_list(void** list, int count);

   // Debugging

   static bool verify_in_progress() { return _verify_in_progress; }

   static void verify(bool allow_dirty = true, bool silent = false, bool option = true);

   static int  verify_count()                  { return _verify_count; }

   static void print();

   static void print_on(outputStream* st);

   static void print_heap_at_SIGBREAK();

   static void print_heap_before_gc() { print_heap_before_gc(gclog_or_tty); }

   static void print_heap_after_gc()  { print_heap_after_gc(gclog_or_tty); }

   static void print_heap_before_gc(outputStream* st);

   static void print_heap_after_gc(outputStream* st);

   // Change the number of dummy objects kept reachable by the full gc dummy

   // array; this should trigger relocation in a sliding compaction collector.

   debug_only(static bool release_fullgc_alot_dummy();)

   // The non-oop pattern (see compiledIC.hpp, etc)

   static void*   non_oop_word();

   // Oop verification (see MacroAssembler::verify_oop)

   static uintptr_t verify_oop_mask()          PRODUCT_RETURN0;

   static uintptr_t verify_oop_bits()          PRODUCT_RETURN0;

   static uintptr_t verify_mark_bits()         PRODUCT_RETURN0;

   static uintptr_t verify_mark_mask()         PRODUCT_RETURN0;

   static uintptr_t verify_klass_mask()        PRODUCT_RETURN0;

   static uintptr_t verify_klass_bits()        PRODUCT_RETURN0;

   // Flushing and deoptimization

   static void flush_dependents_on(instanceKlassHandle dependee);

 #ifdef HOTSWAP

   // Flushing and deoptimization in case of evolution

   static void flush_evol_dependents_on(instanceKlassHandle dependee);

 #endif // HOTSWAP

   // Support for fullspeed debugging

   static void flush_dependents_on_method(methodHandle dependee);

   // Compiler support

   static int base_vtable_size()               { return _base_vtable_size; }

 };

 class DeferredObjAllocEvent : public CHeapObj {

   private:

     oop    _oop;

     size_t _bytesize;

     jint   _arena_id;

   public:

     DeferredObjAllocEvent(const oop o, const size_t s, const jint id) {

       _oop      = o;

       _bytesize = s;

       _arena_id = id;

     }

     ~DeferredObjAllocEvent() {

     }

     jint   arena_id() { return _arena_id; }

     size_t bytesize() { return _bytesize; }

     oop    get_oop()  { return _oop; }

 };