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 /*

  * Copyright (c) 1997, 2018, 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

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 #ifndef SHARE_VM_MEMORY_UNIVERSE_HPP

 #define SHARE_VM_MEMORY_UNIVERSE_HPP

 #include "runtime/handles.hpp"

 #include "utilities/array.hpp"

 #include "utilities/growableArray.hpp"

 // 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;

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

 // only cares about the latest version of the Method*.  This cache safely

 // interacts with the RedefineClasses API.

 class LatestMethodCache : public CHeapObj<mtClass> {

   // We save the Klass* and the idnum of Method* in order to get

   // the current cached Method*.

  private:

   Klass*                _klass;

   int                   _method_idnum;

  public:

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

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

   void   init(Klass* k, Method* m);

   Klass* klass() const           { return _klass; }

   int    method_idnum() const    { return _method_idnum; }

   Method* get_method();

   // Enhanced Class Redefinition support

   void classes_do(void f(Klass*)) {

     f(_klass);

   }

   // CDS support.  Replace the klass in this with the archive version

   // could use this for Enhanced Class Redefinition also.

   void serialize(SerializeClosure* f) {

     f->do_ptr((void**)&_klass);

   }

 };

 // For UseCompressedOops.

 struct NarrowPtrStruct {

   // 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 ptrs.

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

   // LogMinObjAlignmentInBytes/LogKlassAlignmentInBytes otherwise.

   int     _shift;

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

   bool    _use_implicit_null_checks;

 };

 enum VerifyOption {

       VerifyOption_Default = 0,

       // G1

       VerifyOption_G1UsePrevMarking = VerifyOption_Default,

       VerifyOption_G1UseNextMarking = VerifyOption_G1UsePrevMarking + 1,

       VerifyOption_G1UseMarkWord    = VerifyOption_G1UseNextMarking + 1

 };

 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 VM_PopulateDumpSharedSpace;

   friend class Metaspace;

   friend jint  universe_init();

   friend void  universe2_init();

   friend bool  universe_post_init();

  private:

   // Known classes in the VM

   static Klass* _boolArrayKlassObj;

   static Klass* _byteArrayKlassObj;

   static Klass* _charArrayKlassObj;

   static Klass* _intArrayKlassObj;

   static Klass* _shortArrayKlassObj;

   static Klass* _longArrayKlassObj;

   static Klass* _singleArrayKlassObj;

   static Klass* _doubleArrayKlassObj;

   static Klass* _typeArrayKlassObjs[T_VOID+1];

   static Klass* _objectArrayKlassObj;

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

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

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

   static LatestMethodCache* _pd_implies_cache;         // method for checking protection domain attributes

   static LatestMethodCache* _throw_illegal_access_error_cache; // Unsafe.throwIllegalAccessError() method

   // preallocated error objects (no backtrace)

   static oop          _out_of_memory_error_java_heap;

   static oop          _out_of_memory_error_metaspace;

   static oop          _out_of_memory_error_class_metaspace;

   static oop          _out_of_memory_error_array_size;

   static oop          _out_of_memory_error_gc_overhead_limit;

   static oop          _out_of_memory_error_realloc_objects;

   static Array<int>*       _the_empty_int_array;    // Canonicalized int array

   static Array<u2>*        _the_empty_short_array;  // Canonicalized short array

   static Array<Klass*>*  _the_empty_klass_array;  // Canonicalized klass obj array

   static Array<Method*>* _the_empty_method_array; // Canonicalized method obj array

   static Array<Klass*>*  _the_array_interfaces_array;

   // 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          _allocation_context_notification_obj;

   // The particular choice of collected heap.

   static CollectedHeap* _collectedHeap;

   static intptr_t _non_oop_bits;

   // For UseCompressedOops.

   static struct NarrowPtrStruct _narrow_oop;

   // For UseCompressedClassPointers.

   static struct NarrowPtrStruct _narrow_klass;

   static address _narrow_ptrs_base;

   // 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;

   }

   static void     set_narrow_oop_base(address base) {

     assert(UseCompressedOops, "no compressed oops?");

     _narrow_oop._base    = base;

   }

   static void     set_narrow_klass_base(address base) {

     assert(UseCompressedClassPointers, "no compressed klass ptrs?");

     _narrow_klass._base   = base;

   }

   static void     set_narrow_oop_use_implicit_null_checks(bool use) {

     assert(UseCompressedOops, "no compressed ptrs?");

     _narrow_oop._use_implicit_null_checks   = use;

   }

   // 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 long verify_flags;

   static void compute_verify_oop_data();

  public:

   // Known classes in the VM

   static Klass* boolArrayKlassObj()                 { return _boolArrayKlassObj;   }

   static Klass* byteArrayKlassObj()                 { return _byteArrayKlassObj;   }

   static Klass* charArrayKlassObj()                 { return _charArrayKlassObj;   }

   static Klass* intArrayKlassObj()                  { return _intArrayKlassObj;    }

   static Klass* shortArrayKlassObj()                { return _shortArrayKlassObj;  }

   static Klass* longArrayKlassObj()                 { return _longArrayKlassObj;   }

   static Klass* singleArrayKlassObj()               { return _singleArrayKlassObj; }

   static Klass* doubleArrayKlassObj()               { return _doubleArrayKlassObj; }

   static Klass* objectArrayKlassObj() {

     return _objectArrayKlassObj;

   }

   static Klass* typeArrayKlassObj(BasicType t) {

     assert((uint)t < T_VOID+1, err_msg("range check for type: %s", type2name(t)));

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

     return _typeArrayKlassObjs[t];

   }

   // Known objects in the 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 objArrayOop  the_empty_class_klass_array ()  { return _the_empty_class_klass_array;   }

   static Array<Klass*>* 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 Method*      finalizer_register_method()     { return _finalizer_register_cache->get_method(); }

   static Method*      loader_addClass_method()        { return _loader_addClass_cache->get_method(); }

   static Method*      protection_domain_implies_method() { return _pd_implies_cache->get_method(); }

   static Method*      throw_illegal_access_error()    { return _throw_illegal_access_error_cache->get_method(); }

   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 inline oop   allocation_context_notification_obj();

   static inline void  set_allocation_context_notification_obj(oop obj);

   static Array<int>*       the_empty_int_array()    { return _the_empty_int_array; }

   static Array<u2>*        the_empty_short_array()  { return _the_empty_short_array; }

   static Array<Method*>* the_empty_method_array() { return _the_empty_method_array; }

   static Array<Klass*>*  the_empty_klass_array()  { return _the_empty_klass_array; }

   // 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_metaspace()          { return gen_out_of_memory_error(_out_of_memory_error_metaspace);   }

   static oop out_of_memory_error_class_metaspace()    { return gen_out_of_memory_error(_out_of_memory_error_class_metaspace);   }

   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);  }

   static oop out_of_memory_error_realloc_objects()    { return gen_out_of_memory_error(_out_of_memory_error_realloc_objects);  }

   // Accessors needed for fast allocation

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

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

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

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

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

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

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

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

   static Klass** objectArrayKlassObj_addr()         { return &_objectArrayKlassObj; }

   // The particular choice of collected heap.

   static CollectedHeap* heap() { return _collectedHeap; }

   // For UseCompressedOops

   // 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 NARROW_OOP_MODE narrow_oop_mode();

   static const char* narrow_oop_mode_to_string(NARROW_OOP_MODE mode);

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

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

   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 bool     narrow_oop_use_implicit_null_checks()   { return  _narrow_oop._use_implicit_null_checks; }

   // For UseCompressedClassPointers

   static address  narrow_klass_base()                     { return  _narrow_klass._base; }

   static bool  is_narrow_klass_base(void* addr)           { return (narrow_klass_base() == (address)addr); }

   static int      narrow_klass_shift()                    { return  _narrow_klass._shift; }

   static bool     narrow_klass_use_implicit_null_checks() { return  _narrow_klass._use_implicit_null_checks; }

   static address* narrow_ptrs_base_addr()                 { return &_narrow_ptrs_base; }

   static void     set_narrow_ptrs_base(address a)         { _narrow_ptrs_base = a; }

   static address  narrow_ptrs_base()                      { return _narrow_ptrs_base; }

   static void     print_compressed_oops_mode(outputStream* st);

   // this is set in vm_version on sparc (and then reset in universe afaict)

   static void     set_narrow_oop_shift(int shift)         {

     _narrow_oop._shift   = shift;

   }

   static void     set_narrow_klass_shift(int shift)       {

     assert(shift == 0 || shift == LogKlassAlignmentInBytes, "invalid shift for klass ptrs");

     _narrow_klass._shift   = shift;

   }

   // Reserve Java heap and determine CompressedOops mode

   static ReservedSpace reserve_heap(size_t heap_size, size_t alignment);

   // 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);

   // CDS support

   static void serialize(SerializeClosure* 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(Klass*));

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

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

   // Debugging

   enum VERIFY_FLAGS {

     Verify_Threads = 1,

     Verify_Heap = 2,

     Verify_SymbolTable = 4,

     Verify_StringTable = 8,

     Verify_CodeCache = 16,

     Verify_SystemDictionary = 32,

     Verify_ClassLoaderDataGraph = 64,

     Verify_MetaspaceAux = 128,

     Verify_JNIHandles = 256,

     Verify_CHeap = 512,

     Verify_CodeCacheOops = 1024,

     Verify_All = -1

   };

   static void initialize_verify_flags();

   static bool should_verify_subset(uint subset);

   static bool verify_in_progress() { return _verify_in_progress; }

   static void verify(VerifyOption option, const char* prefix, bool silent = VerifySilently);

   static void verify(const char* prefix, bool silent = VerifySilently) {

     verify(VerifyOption_Default, prefix, silent);

   }

   static void verify(bool silent = VerifySilently) {

     verify("", silent);

   }

   static int  verify_count()       { return _verify_count; }

   // The default behavior is to call print_on() on gclog_or_tty.

   static void print();

   // The extended parameter determines which method on the heap will

   // be called: print_on() (extended == false) or print_extended_on()

   // (extended == true).

   static void print_on(outputStream* st, bool extended = false);

   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, bool ignore_extended = false);

   static void print_heap_after_gc(outputStream* st, bool ignore_extended = false);

   // 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;

   // Flushing and deoptimization

   static void flush_dependents_on(instanceKlassHandle dependee);

   static void flush_dependents_on(Handle call_site, Handle method_handle);

 #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<mtInternal> {

   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; }

 };

 #endif // SHARE_VM_MEMORY_UNIVERSE_HPP