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 /*

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

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  * published by the Free Software Foundation.

  *

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  * 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.

  *

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 #ifndef SHARE_VM_MEMORY_METASPACE_HPP

 #define SHARE_VM_MEMORY_METASPACE_HPP

 #include "memory/allocation.hpp"

 #include "memory/memRegion.hpp"

 #include "memory/metaspaceChunkFreeListSummary.hpp"

 #include "runtime/virtualspace.hpp"

 #include "utilities/exceptions.hpp"

 // Metaspace

 //

 // Metaspaces are Arenas for the VM's metadata.

 // They are allocated one per class loader object, and one for the null

 // bootstrap class loader

 // Eventually for bootstrap loader we'll have a read-only section and read-write

 // to write for DumpSharedSpaces and read for UseSharedSpaces

 //

 //    block X ---+       +-------------------+

 //               |       |  Virtualspace     |

 //               |       |                   |

 //               |       |                   |

 //               |       |-------------------|

 //               |       || Chunk            |

 //               |       ||                  |

 //               |       ||----------        |

 //               +------>||| block 0 |       |

 //                       ||----------        |

 //                       ||| block 1 |       |

 //                       ||----------        |

 //                       ||                  |

 //                       |-------------------|

 //                       |                   |

 //                       |                   |

 //                       +-------------------+

 //

 class ChunkManager;

 class ClassLoaderData;

 class Metablock;

 class Metachunk;

 class MetaspaceTracer;

 class MetaWord;

 class Mutex;

 class outputStream;

 class SpaceManager;

 class VirtualSpaceList;

 // Metaspaces each have a  SpaceManager and allocations

 // are done by the SpaceManager.  Allocations are done

 // out of the current Metachunk.  When the current Metachunk

 // is exhausted, the SpaceManager gets a new one from

 // the current VirtualSpace.  When the VirtualSpace is exhausted

 // the SpaceManager gets a new one.  The SpaceManager

 // also manages freelists of available Chunks.

 //

 // Currently the space manager maintains the list of

 // virtual spaces and the list of chunks in use.  Its

 // allocate() method returns a block for use as a

 // quantum of metadata.

 class Metaspace : public CHeapObj<mtClass> {

   friend class VMStructs;

   friend class SpaceManager;

   friend class VM_CollectForMetadataAllocation;

   friend class MetaspaceGC;

   friend class MetaspaceAux;

  public:

   enum MetadataType {

     ClassType,

     NonClassType,

     MetadataTypeCount

   };

   enum MetaspaceType {

     StandardMetaspaceType,

     BootMetaspaceType,

     ROMetaspaceType,

     ReadWriteMetaspaceType,

     AnonymousMetaspaceType,

     ReflectionMetaspaceType

   };

  private:

   static void verify_global_initialization();

   void initialize(Mutex* lock, MetaspaceType type);

   // Initialize the first chunk for a Metaspace.  Used for

   // special cases such as the boot class loader, reflection

   // class loader and anonymous class loader.

   void initialize_first_chunk(MetaspaceType type, MetadataType mdtype);

   Metachunk* get_initialization_chunk(MetaspaceType type, MetadataType mdtype);

   // Align up the word size to the allocation word size

   static size_t align_word_size_up(size_t);

   // Aligned size of the metaspace.

   static size_t _compressed_class_space_size;

   static size_t compressed_class_space_size() {

     return _compressed_class_space_size;

   }

   static void set_compressed_class_space_size(size_t size) {

     _compressed_class_space_size = size;

   }

   static size_t _first_chunk_word_size;

   static size_t _first_class_chunk_word_size;

   static size_t _commit_alignment;

   static size_t _reserve_alignment;

   SpaceManager* _vsm;

   SpaceManager* vsm() const { return _vsm; }

   SpaceManager* _class_vsm;

   SpaceManager* class_vsm() const { return _class_vsm; }

   SpaceManager* get_space_manager(MetadataType mdtype) {

     assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");

     return mdtype == ClassType ? class_vsm() : vsm();

   }

   // Allocate space for metadata of type mdtype. This is space

   // within a Metachunk and is used by

   //   allocate(ClassLoaderData*, size_t, bool, MetadataType, TRAPS)

   MetaWord* allocate(size_t word_size, MetadataType mdtype);

   // Virtual Space lists for both classes and other metadata

   static VirtualSpaceList* _space_list;

   static VirtualSpaceList* _class_space_list;

   static ChunkManager* _chunk_manager_metadata;

   static ChunkManager* _chunk_manager_class;

   static const MetaspaceTracer* _tracer;

  public:

   static VirtualSpaceList* space_list()       { return _space_list; }

   static VirtualSpaceList* class_space_list() { return _class_space_list; }

   static VirtualSpaceList* get_space_list(MetadataType mdtype) {

     assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");

     return mdtype == ClassType ? class_space_list() : space_list();

   }

   static ChunkManager* chunk_manager_metadata() { return _chunk_manager_metadata; }

   static ChunkManager* chunk_manager_class()    { return _chunk_manager_class; }

   static ChunkManager* get_chunk_manager(MetadataType mdtype) {

     assert(mdtype != MetadataTypeCount, "MetadaTypeCount can't be used as mdtype");

     return mdtype == ClassType ? chunk_manager_class() : chunk_manager_metadata();

   }

   static const MetaspaceTracer* tracer() { return _tracer; }

  private:

   // These 2 methods are used by DumpSharedSpaces only, where only _vsm is used. So we will

   // maintain a single list for now.

   void record_allocation(void* ptr, MetaspaceObj::Type type, size_t word_size);

   void record_deallocation(void* ptr, size_t word_size);

 #ifdef _LP64

   static void set_narrow_klass_base_and_shift(address metaspace_base, address cds_base);

   // Returns true if can use CDS with metaspace allocated as specified address.

   static bool can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base);

   static void allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base);

   static void initialize_class_space(ReservedSpace rs);

 #endif

   class AllocRecord : public CHeapObj<mtClass> {

   public:

     AllocRecord(address ptr, MetaspaceObj::Type type, int byte_size)

       : _next(NULL), _ptr(ptr), _type(type), _byte_size(byte_size) {}

     AllocRecord *_next;

     address _ptr;

     MetaspaceObj::Type _type;

     int _byte_size;

   };

   AllocRecord * _alloc_record_head;

   AllocRecord * _alloc_record_tail;

   size_t class_chunk_size(size_t word_size);

  public:

   Metaspace(Mutex* lock, MetaspaceType type);

   ~Metaspace();

   static void ergo_initialize();

   static void global_initialize();

   static void post_initialize();

   static size_t first_chunk_word_size() { return _first_chunk_word_size; }

   static size_t first_class_chunk_word_size() { return _first_class_chunk_word_size; }

   static size_t reserve_alignment()       { return _reserve_alignment; }

   static size_t reserve_alignment_words() { return _reserve_alignment / BytesPerWord; }

   static size_t commit_alignment()        { return _commit_alignment; }

   static size_t commit_alignment_words()  { return _commit_alignment / BytesPerWord; }

   char*  bottom() const;

   size_t used_words_slow(MetadataType mdtype) const;

   size_t free_words_slow(MetadataType mdtype) const;

   size_t capacity_words_slow(MetadataType mdtype) const;

   size_t used_bytes_slow(MetadataType mdtype) const;

   size_t capacity_bytes_slow(MetadataType mdtype) const;

   size_t allocated_blocks_bytes() const;

   size_t allocated_chunks_bytes() const;

   static MetaWord* allocate(ClassLoaderData* loader_data, size_t word_size,

                             bool read_only, MetaspaceObj::Type type, TRAPS);

   void deallocate(MetaWord* ptr, size_t byte_size, bool is_class);

   MetaWord* expand_and_allocate(size_t size,

                                 MetadataType mdtype);

   static bool contains(const void* ptr);

   void dump(outputStream* const out) const;

   // Free empty virtualspaces

   static void purge(MetadataType mdtype);

   static void purge();

   static void report_metadata_oome(ClassLoaderData* loader_data, size_t word_size,

                                    MetaspaceObj::Type type, MetadataType mdtype, TRAPS);

   static const char* metadata_type_name(Metaspace::MetadataType mdtype);

   void print_on(outputStream* st) const;

   // Debugging support

   void verify();

   static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0) NOT_LP64({});

   class AllocRecordClosure :  public StackObj {

   public:

     virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;

   };

   void iterate(AllocRecordClosure *closure);

   // Return TRUE only if UseCompressedClassPointers is True and DumpSharedSpaces is False.

   static bool using_class_space() {

     return NOT_LP64(false) LP64_ONLY(UseCompressedClassPointers && !DumpSharedSpaces);

   }

   static bool is_class_space_allocation(MetadataType mdType) {

     return mdType == ClassType && using_class_space();

   }

 };

 class MetaspaceAux : AllStatic {

   static size_t free_chunks_total_words(Metaspace::MetadataType mdtype);

   // These methods iterate over the classloader data graph

   // for the given Metaspace type.  These are slow.

   static size_t used_bytes_slow(Metaspace::MetadataType mdtype);

   static size_t free_bytes_slow(Metaspace::MetadataType mdtype);

   static size_t capacity_bytes_slow(Metaspace::MetadataType mdtype);

   static size_t capacity_bytes_slow();

   // Running sum of space in all Metachunks that has been

   // allocated to a Metaspace.  This is used instead of

   // iterating over all the classloaders. One for each

   // type of Metadata

   static size_t _capacity_words[Metaspace:: MetadataTypeCount];

   // Running sum of space in all Metachunks that

   // are being used for metadata. One for each

   // type of Metadata.

   static size_t _used_words[Metaspace:: MetadataTypeCount];

  public:

   // Decrement and increment _allocated_capacity_words

   static void dec_capacity(Metaspace::MetadataType type, size_t words);

   static void inc_capacity(Metaspace::MetadataType type, size_t words);

   // Decrement and increment _allocated_used_words

   static void dec_used(Metaspace::MetadataType type, size_t words);

   static void inc_used(Metaspace::MetadataType type, size_t words);

   // Total of space allocated to metadata in all Metaspaces.

   // This sums the space used in each Metachunk by

   // iterating over the classloader data graph

   static size_t used_bytes_slow() {

     return used_bytes_slow(Metaspace::ClassType) +

            used_bytes_slow(Metaspace::NonClassType);

   }

   // Used by MetaspaceCounters

   static size_t free_chunks_total_words();

   static size_t free_chunks_total_bytes();

   static size_t free_chunks_total_bytes(Metaspace::MetadataType mdtype);

   static size_t capacity_words(Metaspace::MetadataType mdtype) {

     return _capacity_words[mdtype];

   }

   static size_t capacity_words() {

     return capacity_words(Metaspace::NonClassType) +

            capacity_words(Metaspace::ClassType);

   }

   static size_t capacity_bytes(Metaspace::MetadataType mdtype) {

     return capacity_words(mdtype) * BytesPerWord;

   }

   static size_t capacity_bytes() {

     return capacity_words() * BytesPerWord;

   }

   static size_t used_words(Metaspace::MetadataType mdtype) {

     return _used_words[mdtype];

   }

   static size_t used_words() {

     return used_words(Metaspace::NonClassType) +

            used_words(Metaspace::ClassType);

   }

   static size_t used_bytes(Metaspace::MetadataType mdtype) {

     return used_words(mdtype) * BytesPerWord;

   }

   static size_t used_bytes() {

     return used_words() * BytesPerWord;

   }

   static size_t free_bytes();

   static size_t free_bytes(Metaspace::MetadataType mdtype);

   static size_t reserved_bytes(Metaspace::MetadataType mdtype);

   static size_t reserved_bytes() {

     return reserved_bytes(Metaspace::ClassType) +

            reserved_bytes(Metaspace::NonClassType);

   }

   static size_t committed_bytes(Metaspace::MetadataType mdtype);

   static size_t committed_bytes() {

     return committed_bytes(Metaspace::ClassType) +

            committed_bytes(Metaspace::NonClassType);

   }

   static size_t min_chunk_size_words();

   static size_t min_chunk_size_bytes() {

     return min_chunk_size_words() * BytesPerWord;

   }

   static bool has_chunk_free_list(Metaspace::MetadataType mdtype);

   static MetaspaceChunkFreeListSummary chunk_free_list_summary(Metaspace::MetadataType mdtype);

   // Print change in used metadata.

   static void print_metaspace_change(size_t prev_metadata_used);

   static void print_on(outputStream * out);

   static void print_on(outputStream * out, Metaspace::MetadataType mdtype);

   static void print_class_waste(outputStream* out);

   static void print_waste(outputStream* out);

   static void dump(outputStream* out);

   static void verify_free_chunks();

   // Checks that the values returned by allocated_capacity_bytes() and

   // capacity_bytes_slow() are the same.

   static void verify_capacity();

   static void verify_used();

   static void verify_metrics();

 };

 // Metaspace are deallocated when their class loader are GC'ed.

 // This class implements a policy for inducing GC's to recover

 // Metaspaces.

 class MetaspaceGC : AllStatic {

   // The current high-water-mark for inducing a GC.

   // When committed memory of all metaspaces reaches this value,

   // a GC is induced and the value is increased. Size is in bytes.

   static volatile intptr_t _capacity_until_GC;

   // For a CMS collection, signal that a concurrent collection should

   // be started.

   static bool _should_concurrent_collect;

   static uint _shrink_factor;

   static size_t shrink_factor() { return _shrink_factor; }

   void set_shrink_factor(uint v) { _shrink_factor = v; }

  public:

   static void initialize();

   static void post_initialize();

   static size_t capacity_until_GC();

   static bool inc_capacity_until_GC(size_t v,

                                     size_t* new_cap_until_GC = NULL,

                                     size_t* old_cap_until_GC = NULL,

                                     bool* can_retry = NULL);

   static size_t dec_capacity_until_GC(size_t v);

   static bool should_concurrent_collect() { return _should_concurrent_collect; }

   static void set_should_concurrent_collect(bool v) {

     _should_concurrent_collect = v;

   }

   // The amount to increase the high-water-mark (_capacity_until_GC)

   static size_t delta_capacity_until_GC(size_t bytes);

   // Tells if we have can expand metaspace without hitting set limits.

   static bool can_expand(size_t words, bool is_class);

   // Returns amount that we can expand without hitting a GC,

   // measured in words.

   static size_t allowed_expansion();

   // Calculate the new high-water mark at which to induce

   // a GC.

   static void compute_new_size();

 };

 #endif // SHARE_VM_MEMORY_METASPACE_HPP