/*

 * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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 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 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 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);

  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; }

};