--- /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<oop, oop,
+ MetaspaceShared::obj_hash,
+ MetaspaceShared::obj_equals,
+ 15889, // prime number
+ ResourceObj::C_HEAP> 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<MemRegion> * 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 <typename T>
+ static Array<T>* new_ro_array(int length) {
+#if INCLUDE_CDS
+ size_t byte_size = Array<T>::byte_sizeof(length, sizeof(T));
+ Array<T>* array = (Array<T>*)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