diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/memory/metaspaceShared.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/memory/metaspaceShared.hpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,246 @@ +/* + * Copyright (c) 2012, 2017, 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. + * + */ + +#ifndef SHARE_VM_MEMORY_METASPACESHARED_HPP +#define SHARE_VM_MEMORY_METASPACESHARED_HPP + +#include "classfile/compactHashtable.hpp" +#include "memory/allocation.hpp" +#include "memory/memRegion.hpp" +#include "memory/virtualspace.hpp" +#include "oops/oop.inline.hpp" +#include "utilities/exceptions.hpp" +#include "utilities/macros.hpp" +#include "utilities/resourceHash.hpp" + +#define MAX_SHARED_DELTA (0x7FFFFFFF) + +class FileMapInfo; + +class MetaspaceSharedStats VALUE_OBJ_CLASS_SPEC { +public: + MetaspaceSharedStats() { + memset(this, 0, sizeof(*this)); + } + CompactHashtableStats symbol; + CompactHashtableStats string; +}; + +// Class Data Sharing Support +class MetaspaceShared : AllStatic { + + // CDS support + static ReservedSpace _shared_rs; + static VirtualSpace _shared_vs; + static int _max_alignment; + static MetaspaceSharedStats _stats; + static bool _has_error_classes; + static bool _archive_loading_failed; + static bool _remapped_readwrite; + static bool _open_archive_heap_region_mapped; + static address _cds_i2i_entry_code_buffers; + static size_t _cds_i2i_entry_code_buffers_size; + static size_t _core_spaces_size; + public: + enum { + // core archive spaces + mc = 0, // miscellaneous code for method trampolines + rw = 1, // read-write shared space in the heap + ro = 2, // read-only shared space in the heap + md = 3, // miscellaneous data for initializing tables, etc. + num_core_spaces = 4, // number of non-string regions + + // optional mapped spaces + // Currently it only contains class file data. + od = num_core_spaces, + num_non_heap_spaces = od + 1, + + // mapped java heap regions + first_string = od + 1, // index of first string region + max_strings = 2, // max number of string regions in string space + first_open_archive_heap_region = first_string + max_strings, + max_open_archive_heap_region = 2, + + last_valid_region = first_open_archive_heap_region + max_open_archive_heap_region - 1, + n_regions = last_valid_region + 1 // total number of regions + }; + + static void prepare_for_dumping() NOT_CDS_RETURN; + static void preload_and_dump(TRAPS) NOT_CDS_RETURN; + static int preload_classes(const char * class_list_path, + TRAPS) NOT_CDS_RETURN_(0); + +#if INCLUDE_CDS_JAVA_HEAP + private: + static bool obj_equals(oop const& p1, oop const& p2) { + return p1 == p2; + } + static unsigned obj_hash(oop const& p) { + assert(!p->mark()->has_bias_pattern(), + "this object should never have been locked"); // so identity_hash won't safepoin + unsigned hash = (unsigned)p->identity_hash(); + return hash; + } + typedef ResourceHashtable ArchivedObjectCache; + static ArchivedObjectCache* _archive_object_cache; + + public: + static ArchivedObjectCache* archive_object_cache() { + return _archive_object_cache; + } + static oop archive_heap_object(oop obj, Thread* THREAD); + static void archive_resolved_constants(Thread* THREAD); +#endif + static bool is_heap_object_archiving_allowed() { + CDS_JAVA_HEAP_ONLY(return (UseG1GC && UseCompressedOops && UseCompressedClassPointers);) + NOT_CDS_JAVA_HEAP(return false;) + } + static void create_archive_object_cache() { + CDS_JAVA_HEAP_ONLY(_archive_object_cache = new (ResourceObj::C_HEAP, mtClass)ArchivedObjectCache();); + } + static void destroy_archive_object_cache() { + CDS_JAVA_HEAP_ONLY(delete _archive_object_cache; _archive_object_cache = NULL;); + } + static void fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN; + + static void dump_open_archive_heap_objects(GrowableArray * open_archive) NOT_CDS_JAVA_HEAP_RETURN; + static void set_open_archive_heap_region_mapped() { + CDS_JAVA_HEAP_ONLY(_open_archive_heap_region_mapped = true); + NOT_CDS_JAVA_HEAP_RETURN; + } + static bool open_archive_heap_region_mapped() { + CDS_JAVA_HEAP_ONLY(return _open_archive_heap_region_mapped); + NOT_CDS_JAVA_HEAP_RETURN_(false); + } + + static ReservedSpace* shared_rs() { + CDS_ONLY(return &_shared_rs); + NOT_CDS(return NULL); + } + static void commit_shared_space_to(char* newtop) NOT_CDS_RETURN; + static size_t core_spaces_size() { + return _core_spaces_size; + } + static void initialize_shared_rs() NOT_CDS_RETURN; + + // Delta of this object from the bottom of the archive. + static uintx object_delta(void* obj) { + assert(DumpSharedSpaces, "supported only for dumping"); + assert(shared_rs()->contains(obj), "must be"); + address base_address = address(shared_rs()->base()); + uintx delta = address(obj) - base_address; + return delta; + } + + static void set_archive_loading_failed() { + _archive_loading_failed = true; + } + static bool map_shared_spaces(FileMapInfo* mapinfo) NOT_CDS_RETURN_(false); + static void initialize_shared_spaces() NOT_CDS_RETURN; + + // Return true if given address is in the mapped shared space. + static bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); + + // Return true if given address is in the shared region corresponding to the idx + static bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false); + + static bool is_heap_region(int idx) { + CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string && + idx < MetaspaceShared::first_open_archive_heap_region + + MetaspaceShared::max_open_archive_heap_region)); + NOT_CDS_JAVA_HEAP_RETURN_(false); + } + static bool is_string_region(int idx) { + CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_string && + idx < MetaspaceShared::first_string + MetaspaceShared::max_strings)); + NOT_CDS_JAVA_HEAP_RETURN_(false); + } + static bool is_open_archive_heap_region(int idx) { + CDS_JAVA_HEAP_ONLY(return (idx >= MetaspaceShared::first_open_archive_heap_region && + idx < MetaspaceShared::first_open_archive_heap_region + + MetaspaceShared::max_open_archive_heap_region)); + NOT_CDS_JAVA_HEAP_RETURN_(false); + } + static bool is_in_trampoline_frame(address addr) NOT_CDS_RETURN_(false); + + static void allocate_cpp_vtable_clones(); + static intptr_t* clone_cpp_vtables(intptr_t* p); + static void zero_cpp_vtable_clones_for_writing(); + static void patch_cpp_vtable_pointers(); + static bool is_valid_shared_method(const Method* m) NOT_CDS_RETURN_(false); + static void serialize(SerializeClosure* sc); + + static MetaspaceSharedStats* stats() { + return &_stats; + } + + static void report_out_of_space(const char* name, size_t needed_bytes); + + // JVM/TI RedefineClasses() support: + // Remap the shared readonly space to shared readwrite, private if + // sharing is enabled. Simply returns true if sharing is not enabled + // or if the remapping has already been done by a prior call. + static bool remap_shared_readonly_as_readwrite() NOT_CDS_RETURN_(true); + static bool remapped_readwrite() { + CDS_ONLY(return _remapped_readwrite); + NOT_CDS(return false); + } + + static void print_shared_spaces(); + + static bool try_link_class(InstanceKlass* ik, TRAPS); + static void link_and_cleanup_shared_classes(TRAPS); + static void check_shared_class_loader_type(Klass* obj); + + // Allocate a block of memory from the "mc", "ro", or "rw" regions. + static char* misc_code_space_alloc(size_t num_bytes); + static char* read_only_space_alloc(size_t num_bytes); + + template + static Array* new_ro_array(int length) { +#if INCLUDE_CDS + size_t byte_size = Array::byte_sizeof(length, sizeof(T)); + Array* array = (Array*)read_only_space_alloc(byte_size); + array->initialize(length); + return array; +#else + return NULL; +#endif + } + + static address cds_i2i_entry_code_buffers(size_t total_size); + + static address cds_i2i_entry_code_buffers() { + return _cds_i2i_entry_code_buffers; + } + static size_t cds_i2i_entry_code_buffers_size() { + return _cds_i2i_entry_code_buffers_size; + } + static void relocate_klass_ptr(oop o); +}; +#endif // SHARE_VM_MEMORY_METASPACESHARED_HPP