author | jiangli |
Fri, 06 Oct 2017 19:33:27 -0400 | |
changeset 47599 | 0fb1d501c408 |
parent 47216 | 71c04702a3d5 |
child 48794 | ea0d0781c63c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_MEMORY_METASPACESHARED_HPP |
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#define SHARE_VM_MEMORY_METASPACESHARED_HPP |
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#include "classfile/compactHashtable.hpp" |
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#include "memory/allocation.hpp" |
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#include "memory/memRegion.hpp" |
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#include "memory/virtualspace.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "utilities/exceptions.hpp" |
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#include "utilities/macros.hpp" |
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#include "utilities/resourceHash.hpp" |
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#define MAX_SHARED_DELTA (0x7FFFFFFF) |
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class FileMapInfo; |
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class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC { |
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public: |
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MetaspaceSharedStats() { |
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memset(this, 0, sizeof(*this)); |
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} |
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CompactHashtableStats symbol; |
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CompactHashtableStats string; |
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}; |
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// Class Data Sharing Support |
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class MetaspaceShared : AllStatic { |
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// CDS support |
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static ReservedSpace _shared_rs; |
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static VirtualSpace _shared_vs; |
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static int _max_alignment; |
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static MetaspaceSharedStats _stats; |
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static bool _has_error_classes; |
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static bool _archive_loading_failed; |
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static bool _remapped_readwrite; |
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static bool _open_archive_heap_region_mapped; |
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static address _cds_i2i_entry_code_buffers; |
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static size_t _cds_i2i_entry_code_buffers_size; |
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static size_t _core_spaces_size; |
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public: |
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enum { |
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// core archive spaces |
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mc = 0, // miscellaneous code for method trampolines |
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rw = 1, // read-write shared space in the heap |
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ro = 2, // read-only shared space in the heap |
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md = 3, // miscellaneous data for initializing tables, etc. |
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num_core_spaces = 4, // number of non-string regions |
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// optional mapped spaces |
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// Currently it only contains class file data. |
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od = num_core_spaces, |
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num_non_heap_spaces = od + 1, |
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// mapped java heap regions |
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first_string = od + 1, // index of first string region |
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max_strings = 2, // max number of string regions in string space |
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first_open_archive_heap_region = first_string + max_strings, |
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max_open_archive_heap_region = 2, |
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last_valid_region = first_open_archive_heap_region + max_open_archive_heap_region - 1, |
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n_regions = last_valid_region + 1 // total number of regions |
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}; |
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static void prepare_for_dumping() NOT_CDS_RETURN; |
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static void preload_and_dump(TRAPS) NOT_CDS_RETURN; |
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static int preload_classes(const char * class_list_path, |
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TRAPS) NOT_CDS_RETURN_(0); |
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#if INCLUDE_CDS_JAVA_HEAP |
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private: |
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static bool obj_equals(oop const& p1, oop const& p2) { |
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return p1 == p2; |
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} |
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static unsigned obj_hash(oop const& p) { |
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assert(!p->mark()->has_bias_pattern(), |
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"this object should never have been locked"); // so identity_hash won't safepoin |
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unsigned hash = (unsigned)p->identity_hash(); |
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return hash; |
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} |
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typedef ResourceHashtable<oop, oop, |
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MetaspaceShared::obj_hash, |
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MetaspaceShared::obj_equals, |
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15889, // prime number |
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ResourceObj::C_HEAP> ArchivedObjectCache; |
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static ArchivedObjectCache* _archive_object_cache; |
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public: |
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static ArchivedObjectCache* archive_object_cache() { |
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return _archive_object_cache; |
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} |
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static oop archive_heap_object(oop obj, Thread* THREAD); |
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static void archive_resolved_constants(Thread* THREAD); |
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#endif |
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static bool is_heap_object_archiving_allowed() { |
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CDS_JAVA_HEAP_ONLY(return (UseG1GC && UseCompressedOops && UseCompressedClassPointers);) |
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NOT_CDS_JAVA_HEAP(return false;) |
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} |
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static void create_archive_object_cache() { |
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CDS_JAVA_HEAP_ONLY(_archive_object_cache = new (ResourceObj::C_HEAP, mtClass)ArchivedObjectCache();); |
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} |
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static void destroy_archive_object_cache() { |
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CDS_JAVA_HEAP_ONLY(delete _archive_object_cache; _archive_object_cache = NULL;); |
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} |
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static void fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN; |
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|
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static void dump_open_archive_heap_objects(GrowableArray<MemRegion> * open_archive) NOT_CDS_JAVA_HEAP_RETURN; |
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static void set_open_archive_heap_region_mapped() { |
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CDS_JAVA_HEAP_ONLY(_open_archive_heap_region_mapped = true); |
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NOT_CDS_JAVA_HEAP_RETURN; |
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} |
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static bool open_archive_heap_region_mapped() { |
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CDS_JAVA_HEAP_ONLY(return _open_archive_heap_region_mapped); |
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NOT_CDS_JAVA_HEAP_RETURN_(false); |
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} |
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|
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static ReservedSpace* shared_rs() { |
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CDS_ONLY(return &_shared_rs); |
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NOT_CDS(return NULL); |
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} |
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static void commit_shared_space_to(char* newtop) NOT_CDS_RETURN; |
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static size_t core_spaces_size() { |
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return _core_spaces_size; |
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} |
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static void initialize_dumptime_shared_and_meta_spaces() NOT_CDS_RETURN; |
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static void initialize_runtime_shared_and_meta_spaces() NOT_CDS_RETURN; |
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|
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// Delta of this object from the bottom of the archive. |
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static uintx object_delta(void* obj) { |
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assert(DumpSharedSpaces, "supported only for dumping"); |
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assert(shared_rs()->contains(obj), "must be"); |
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address base_address = address(shared_rs()->base()); |
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uintx delta = address(obj) - base_address; |
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return delta; |
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} |
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|
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static void set_archive_loading_failed() { |
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_archive_loading_failed = true; |
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} |
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static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); |
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static void initialize_shared_spaces() NOT_CDS_RETURN; |
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|
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// Return true if given address is in the mapped shared space. |
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static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); |
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|
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// Return true if given address is in the shared region corresponding to the idx |
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static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false); |
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|
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static bool is_heap_region(int idx) { |
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CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string && |
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idx < MetaspaceShared::first_open_archive_heap_region + |
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MetaspaceShared::max_open_archive_heap_region)); |
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NOT_CDS_JAVA_HEAP_RETURN_(false); |
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} |
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static bool is_string_region(int idx) { |
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CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string && |
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idx < MetaspaceShared::first_string + MetaspaceShared::max_strings)); |
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NOT_CDS_JAVA_HEAP_RETURN_(false); |
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} |
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static bool is_open_archive_heap_region(int idx) { |
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CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_open_archive_heap_region && |
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idx < MetaspaceShared::first_open_archive_heap_region + |
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MetaspaceShared::max_open_archive_heap_region)); |
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NOT_CDS_JAVA_HEAP_RETURN_(false); |
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} |
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static bool is_in_trampoline_frame(address addr) NOT_CDS_RETURN_(false); |
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191 |
|
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static void allocate_cpp_vtable_clones(); |
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static intptr_t* clone_cpp_vtables(intptr_t* p); |
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static void zero_cpp_vtable_clones_for_writing(); |
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static void patch_cpp_vtable_pointers(); |
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static bool is_valid_shared_method(const Method* m) NOT_CDS_RETURN_(false); |
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static void serialize(SerializeClosure* sc); |
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|
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static MetaspaceSharedStats* stats() { |
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return &_stats; |
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} |
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|
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static void report_out_of_space(const char* name, size_t needed_bytes); |
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|
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// JVM/TI RedefineClasses() support: |
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// Remap the shared readonly space to shared readwrite, private if |
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// sharing is enabled. Simply returns true if sharing is not enabled |
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// or if the remapping has already been done by a prior call. |
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static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); |
39714 | 210 |
static bool remapped_readwrite() { |
211 |
CDS_ONLY(return _remapped_readwrite); |
|
212 |
NOT_CDS(return false); |
|
213 |
} |
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|
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static void print_shared_spaces(); |
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|
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static bool try_link_class(InstanceKlass* ik, TRAPS); |
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static void link_and_cleanup_shared_classes(TRAPS); |
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static void check_shared_class_loader_type(Klass* obj); |
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|
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// Allocate a block of memory from the "mc", "ro", or "rw" regions. |
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static char* misc_code_space_alloc(size_t num_bytes); |
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static char* read_only_space_alloc(size_t num_bytes); |
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|
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template <typename T> |
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static Array<T>* new_ro_array(int length) { |
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#if INCLUDE_CDS |
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size_t byte_size = Array<T>::byte_sizeof(length, sizeof(T)); |
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Array<T>* array = (Array<T>*)read_only_space_alloc(byte_size); |
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array->initialize(length); |
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return array; |
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#else |
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return NULL; |
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234 |
#endif |
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235 |
} |
35231 | 236 |
|
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static address cds_i2i_entry_code_buffers(size_t total_size); |
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238 |
|
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static address cds_i2i_entry_code_buffers() { |
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return _cds_i2i_entry_code_buffers; |
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241 |
} |
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static size_t cds_i2i_entry_code_buffers_size() { |
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return _cds_i2i_entry_code_buffers_size; |
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244 |
} |
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static void relocate_klass_ptr(oop o); |
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}; |
30578 | 247 |
#endif // SHARE_VM_MEMORY_METASPACESHARED_HPP |