| /* |
| * Copyright (c) 2012, 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/dictionary.hpp" |
| #include "classfile/loaderConstraints.hpp" |
| #include "classfile/placeholders.hpp" |
| #include "classfile/symbolTable.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "code/codeCache.hpp" |
| #include "memory/filemap.hpp" |
| #include "memory/gcLocker.hpp" |
| #include "memory/metaspace.hpp" |
| #include "memory/metaspaceShared.hpp" |
| #include "oops/objArrayOop.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/signature.hpp" |
| #include "runtime/vm_operations.hpp" |
| #include "runtime/vmThread.hpp" |
| #include "utilities/hashtable.inline.hpp" |
| |
| |
| int MetaspaceShared::_max_alignment = 0; |
| |
| ReservedSpace* MetaspaceShared::_shared_rs = NULL; |
| |
| // Read/write a data stream for restoring/preserving metadata pointers and |
| // miscellaneous data from/to the shared archive file. |
| |
| void MetaspaceShared::serialize(SerializeClosure* soc) { |
| int tag = 0; |
| soc->do_tag(--tag); |
| |
| assert(!UseCompressedOops, "UseCompressedOops doesn't work with shared archive"); |
| // Verify the sizes of various metadata in the system. |
| soc->do_tag(sizeof(Method)); |
| soc->do_tag(sizeof(ConstMethod)); |
| soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE)); |
| soc->do_tag(sizeof(ConstantPool)); |
| soc->do_tag(sizeof(ConstantPoolCache)); |
| soc->do_tag(objArrayOopDesc::base_offset_in_bytes()); |
| soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE)); |
| soc->do_tag(sizeof(Symbol)); |
| |
| // Dump/restore miscellaneous metadata. |
| Universe::serialize(soc, true); |
| soc->do_tag(--tag); |
| |
| // Dump/restore references to commonly used names and signatures. |
| vmSymbols::serialize(soc); |
| soc->do_tag(--tag); |
| |
| soc->do_tag(666); |
| } |
| |
| |
| // CDS code for dumping shared archive. |
| |
| // Global object for holding classes that have been loaded. Since this |
| // is run at a safepoint just before exit, this is the entire set of classes. |
| static GrowableArray<Klass*>* _global_klass_objects; |
| static void collect_classes(Klass* k) { |
| _global_klass_objects->append_if_missing(k); |
| if (k->oop_is_instance()) { |
| // Add in the array classes too |
| InstanceKlass* ik = InstanceKlass::cast(k); |
| ik->array_klasses_do(collect_classes); |
| } |
| } |
| |
| static void remove_unshareable_in_classes() { |
| for (int i = 0; i < _global_klass_objects->length(); i++) { |
| Klass* k = _global_klass_objects->at(i); |
| k->remove_unshareable_info(); |
| } |
| } |
| |
| // Walk all methods in the class list and assign a fingerprint. |
| // so that this part of the ConstMethod* is read only. |
| static void calculate_fingerprints() { |
| for (int i = 0; i < _global_klass_objects->length(); i++) { |
| Klass* k = _global_klass_objects->at(i); |
| if (k->oop_is_instance()) { |
| InstanceKlass* ik = InstanceKlass::cast(k); |
| for (int i = 0; i < ik->methods()->length(); i++) { |
| ResourceMark rm; |
| Method* m = ik->methods()->at(i); |
| (new Fingerprinter(m))->fingerprint(); |
| } |
| } |
| } |
| } |
| |
| // Patch C++ vtable pointer in metadata. |
| |
| // Klass and other metadata objects contain references to c++ vtables in the |
| // JVM library. |
| // Fix them to point to our constructed vtables. However, don't iterate |
| // across the space while doing this, as that causes the vtables to be |
| // patched, undoing our useful work. Instead, iterate to make a list, |
| // then use the list to do the fixing. |
| // |
| // Our constructed vtables: |
| // Dump time: |
| // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs |
| // 2. generate_vtable_methods: create jump table, appended to above vtbl_list |
| // 3. patch_klass_vtables: for Klass list, patch the vtable entry in klass and |
| // associated metadata to point to jump table rather than to current vtbl |
| // Table layout: NOTE FIXED SIZE |
| // 1. vtbl pointers |
| // 2. #Klass X #virtual methods per Klass |
| // 1 entry for each, in the order: |
| // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry |
| // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry |
| // ... |
| // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry, |
| // ... Klass<vtbl_list_size>:method<num_virtuals> entry |
| // Sample entry: (Sparc): |
| // save(sp, -256, sp) |
| // ba,pt common_code |
| // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255) |
| // |
| // Restore time: |
| // 1. initialize_shared_space: reserve space for table |
| // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text |
| // |
| // Execution time: |
| // First virtual method call for any object of these metadata types: |
| // 1. object->klass |
| // 2. vtable entry for that klass points to the jump table entries |
| // 3. branches to common_code with %O0/klass, %L0: Klass index <<8 + method index |
| // 4. common_code: |
| // Get address of new vtbl pointer for this Klass from updated table |
| // Update new vtbl pointer in the Klass: future virtual calls go direct |
| // Jump to method, using new vtbl pointer and method index |
| |
| |
| static void* find_matching_vtbl_ptr(void** vtbl_list, void* new_vtable_start, void* obj) { |
| void* old_vtbl_ptr = *(void**)obj; |
| for (int i = 0; i < MetaspaceShared::vtbl_list_size; i++) { |
| if (vtbl_list[i] == old_vtbl_ptr) { |
| return (void**)new_vtable_start + i * MetaspaceShared::num_virtuals; |
| } |
| } |
| ShouldNotReachHere(); |
| return NULL; |
| } |
| |
| // Assumes the vtable is in first slot in object. |
| static void patch_klass_vtables(void** vtbl_list, void* new_vtable_start) { |
| int n = _global_klass_objects->length(); |
| for (int i = 0; i < n; i++) { |
| Klass* obj = _global_klass_objects->at(i); |
| // Note oop_is_instance() is a virtual call. After patching vtables |
| // all virtual calls on the dummy vtables will restore the original! |
| if (obj->oop_is_instance()) { |
| InstanceKlass* ik = InstanceKlass::cast(obj); |
| *(void**)ik = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, ik); |
| ConstantPool* cp = ik->constants(); |
| *(void**)cp = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, cp); |
| for (int j = 0; j < ik->methods()->length(); j++) { |
| Method* m = ik->methods()->at(j); |
| *(void**)m = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, m); |
| } |
| } else { |
| // Array klasses |
| Klass* k = obj; |
| *(void**)k = find_matching_vtbl_ptr(vtbl_list, new_vtable_start, k); |
| } |
| } |
| } |
| |
| // Closure for serializing initialization data out to a data area to be |
| // written to the shared file. |
| |
| class WriteClosure : public SerializeClosure { |
| private: |
| intptr_t* top; |
| char* end; |
| |
| inline void check_space() { |
| if ((char*)top + sizeof(intptr_t) > end) { |
| report_out_of_shared_space(SharedMiscData); |
| } |
| } |
| |
| public: |
| WriteClosure(char* md_top, char* md_end) { |
| top = (intptr_t*)md_top; |
| end = md_end; |
| } |
| |
| char* get_top() { return (char*)top; } |
| |
| void do_ptr(void** p) { |
| check_space(); |
| *top = (intptr_t)*p; |
| ++top; |
| } |
| |
| void do_tag(int tag) { |
| check_space(); |
| *top = (intptr_t)tag; |
| ++top; |
| } |
| |
| void do_region(u_char* start, size_t size) { |
| if ((char*)top + size > end) { |
| report_out_of_shared_space(SharedMiscData); |
| } |
| assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); |
| assert(size % sizeof(intptr_t) == 0, "bad size"); |
| do_tag((int)size); |
| while (size > 0) { |
| *top = *(intptr_t*)start; |
| ++top; |
| start += sizeof(intptr_t); |
| size -= sizeof(intptr_t); |
| } |
| } |
| |
| bool reading() const { return false; } |
| }; |
| |
| |
| // Populate the shared space. |
| |
| class VM_PopulateDumpSharedSpace: public VM_Operation { |
| private: |
| ClassLoaderData* _loader_data; |
| GrowableArray<Klass*> *_class_promote_order; |
| VirtualSpace _md_vs; |
| VirtualSpace _mc_vs; |
| |
| public: |
| VM_PopulateDumpSharedSpace(ClassLoaderData* loader_data, |
| GrowableArray<Klass*> *class_promote_order) : |
| _loader_data(loader_data) { |
| |
| // Split up and initialize the misc code and data spaces |
| ReservedSpace* shared_rs = MetaspaceShared::shared_rs(); |
| int metadata_size = SharedReadOnlySize+SharedReadWriteSize; |
| ReservedSpace shared_ro_rw = shared_rs->first_part(metadata_size); |
| ReservedSpace misc_section = shared_rs->last_part(metadata_size); |
| |
| // Now split into misc sections. |
| ReservedSpace md_rs = misc_section.first_part(SharedMiscDataSize); |
| ReservedSpace mc_rs = misc_section.last_part(SharedMiscDataSize); |
| _md_vs.initialize(md_rs, SharedMiscDataSize); |
| _mc_vs.initialize(mc_rs, SharedMiscCodeSize); |
| _class_promote_order = class_promote_order; |
| } |
| |
| VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } |
| void doit(); // outline because gdb sucks |
| }; // class VM_PopulateDumpSharedSpace |
| |
| |
| void VM_PopulateDumpSharedSpace::doit() { |
| Thread* THREAD = VMThread::vm_thread(); |
| NOT_PRODUCT(SystemDictionary::verify();) |
| // The following guarantee is meant to ensure that no loader constraints |
| // exist yet, since the constraints table is not shared. This becomes |
| // more important now that we don't re-initialize vtables/itables for |
| // shared classes at runtime, where constraints were previously created. |
| guarantee(SystemDictionary::constraints()->number_of_entries() == 0, |
| "loader constraints are not saved"); |
| guarantee(SystemDictionary::placeholders()->number_of_entries() == 0, |
| "placeholders are not saved"); |
| // Revisit and implement this if we prelink method handle call sites: |
| guarantee(SystemDictionary::invoke_method_table() == NULL || |
| SystemDictionary::invoke_method_table()->number_of_entries() == 0, |
| "invoke method table is not saved"); |
| |
| // At this point, many classes have been loaded. |
| // Gather systemDictionary classes in a global array and do everything to |
| // that so we don't have to walk the SystemDictionary again. |
| _global_klass_objects = new GrowableArray<Klass*>(1000); |
| Universe::basic_type_classes_do(collect_classes); |
| SystemDictionary::classes_do(collect_classes); |
| |
| tty->print_cr("Number of classes %d", _global_klass_objects->length()); |
| |
| // Update all the fingerprints in the shared methods. |
| tty->print("Calculating fingerprints ... "); |
| calculate_fingerprints(); |
| tty->print_cr("done. "); |
| |
| // Remove all references outside the metadata |
| tty->print("Removing unshareable information ... "); |
| remove_unshareable_in_classes(); |
| tty->print_cr("done. "); |
| |
| // Set up the share data and shared code segments. |
| char* md_low = _md_vs.low(); |
| char* md_top = md_low; |
| char* md_end = _md_vs.high(); |
| char* mc_low = _mc_vs.low(); |
| char* mc_top = mc_low; |
| char* mc_end = _mc_vs.high(); |
| |
| // Reserve space for the list of Klass*s whose vtables are used |
| // for patching others as needed. |
| |
| void** vtbl_list = (void**)md_top; |
| int vtbl_list_size = MetaspaceShared::vtbl_list_size; |
| Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); |
| |
| md_top += vtbl_list_size * sizeof(void*); |
| void* vtable = md_top; |
| |
| // Reserve space for a new dummy vtable for klass objects in the |
| // heap. Generate self-patching vtable entries. |
| |
| MetaspaceShared::generate_vtable_methods(vtbl_list, &vtable, |
| &md_top, md_end, |
| &mc_top, mc_end); |
| |
| // Reorder the system dictionary. (Moving the symbols affects |
| // how the hash table indices are calculated.) |
| // Not doing this either. |
| |
| SystemDictionary::reorder_dictionary(); |
| |
| NOT_PRODUCT(SystemDictionary::verify();) |
| |
| // Copy the the symbol table, and the system dictionary to the shared |
| // space in usable form. Copy the hastable |
| // buckets first [read-write], then copy the linked lists of entries |
| // [read-only]. |
| |
| SymbolTable::reverse(md_top); |
| NOT_PRODUCT(SymbolTable::verify()); |
| SymbolTable::copy_buckets(&md_top, md_end); |
| |
| SystemDictionary::reverse(); |
| SystemDictionary::copy_buckets(&md_top, md_end); |
| |
| ClassLoader::verify(); |
| ClassLoader::copy_package_info_buckets(&md_top, md_end); |
| ClassLoader::verify(); |
| |
| SymbolTable::copy_table(&md_top, md_end); |
| SystemDictionary::copy_table(&md_top, md_end); |
| ClassLoader::verify(); |
| ClassLoader::copy_package_info_table(&md_top, md_end); |
| ClassLoader::verify(); |
| |
| // Write the other data to the output array. |
| WriteClosure wc(md_top, md_end); |
| MetaspaceShared::serialize(&wc); |
| md_top = wc.get_top(); |
| |
| // Print shared spaces all the time |
| const char* fmt = "%s space: " PTR_FORMAT " out of " PTR_FORMAT " words allocated at " PTR_FORMAT "."; |
| Metaspace* ro_space = _loader_data->ro_metaspace(); |
| Metaspace* rw_space = _loader_data->rw_metaspace(); |
| tty->print_cr(fmt, "ro", ro_space->used_words(Metaspace::NonClassType), |
| ro_space->capacity_words(Metaspace::NonClassType), |
| ro_space->bottom()); |
| tty->print_cr(fmt, "rw", rw_space->used_words(Metaspace::NonClassType), |
| rw_space->capacity_words(Metaspace::NonClassType), |
| rw_space->bottom()); |
| tty->print_cr(fmt, "md", md_top - md_low, md_end-md_low, md_low); |
| tty->print_cr(fmt, "mc", mc_top - mc_low, mc_end-mc_low, mc_low); |
| |
| // Update the vtable pointers in all of the Klass objects in the |
| // heap. They should point to newly generated vtable. |
| patch_klass_vtables(vtbl_list, vtable); |
| |
| // dunno what this is for. |
| char* saved_vtbl = (char*)os::malloc(vtbl_list_size * sizeof(void*), mtClass); |
| memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*)); |
| memset(vtbl_list, 0, vtbl_list_size * sizeof(void*)); |
| |
| // Create and write the archive file that maps the shared spaces. |
| |
| FileMapInfo* mapinfo = new FileMapInfo(); |
| mapinfo->populate_header(MetaspaceShared::max_alignment()); |
| |
| // Pass 1 - update file offsets in header. |
| mapinfo->write_header(); |
| mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); |
| mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); |
| mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), |
| pointer_delta(md_top, _md_vs.low(), sizeof(char)), |
| SharedMiscDataSize, |
| false, false); |
| mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), |
| pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), |
| SharedMiscCodeSize, |
| true, true); |
| |
| // Pass 2 - write data. |
| mapinfo->open_for_write(); |
| mapinfo->write_header(); |
| mapinfo->write_space(MetaspaceShared::ro, _loader_data->ro_metaspace(), true); |
| mapinfo->write_space(MetaspaceShared::rw, _loader_data->rw_metaspace(), false); |
| mapinfo->write_region(MetaspaceShared::md, _md_vs.low(), |
| pointer_delta(md_top, _md_vs.low(), sizeof(char)), |
| SharedMiscDataSize, |
| false, false); |
| mapinfo->write_region(MetaspaceShared::mc, _mc_vs.low(), |
| pointer_delta(mc_top, _mc_vs.low(), sizeof(char)), |
| SharedMiscCodeSize, |
| true, true); |
| mapinfo->close(); |
| |
| memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*)); |
| } |
| |
| static void link_shared_classes(Klass* obj, TRAPS) { |
| Klass* k = obj; |
| if (k->oop_is_instance()) { |
| InstanceKlass* ik = (InstanceKlass*) k; |
| // Link the class to cause the bytecodes to be rewritten and the |
| // cpcache to be created. |
| if (ik->init_state() < InstanceKlass::linked) { |
| ik->link_class(THREAD); |
| guarantee(!HAS_PENDING_EXCEPTION, "exception in class rewriting"); |
| } |
| } |
| } |
| |
| |
| // Support for a simple checksum of the contents of the class list |
| // file to prevent trivial tampering. The algorithm matches that in |
| // the MakeClassList program used by the J2SE build process. |
| #define JSUM_SEED ((jlong)CONST64(0xcafebabebabecafe)) |
| static jlong |
| jsum(jlong start, const char *buf, const int len) |
| { |
| jlong h = start; |
| char *p = (char *)buf, *e = p + len; |
| while (p < e) { |
| char c = *p++; |
| if (c <= ' ') { |
| /* Skip spaces and control characters */ |
| continue; |
| } |
| h = 31 * h + c; |
| } |
| return h; |
| } |
| |
| // Preload classes from a list, populate the shared spaces and dump to a |
| // file. |
| void MetaspaceShared::preload_and_dump(TRAPS) { |
| TraceTime timer("Dump Shared Spaces", TraceStartupTime); |
| ResourceMark rm; |
| |
| // Lock out GC - is it necessary? I don't think we care. |
| No_GC_Verifier no_gc; |
| |
| // Preload classes to be shared. |
| // Should use some os:: method rather than fopen() here. aB. |
| // Construct the path to the class list (in jre/lib) |
| // Walk up two directories from the location of the VM and |
| // optionally tack on "lib" (depending on platform) |
| char class_list_path[JVM_MAXPATHLEN]; |
| os::jvm_path(class_list_path, sizeof(class_list_path)); |
| for (int i = 0; i < 3; i++) { |
| char *end = strrchr(class_list_path, *os::file_separator()); |
| if (end != NULL) *end = '\0'; |
| } |
| int class_list_path_len = (int)strlen(class_list_path); |
| if (class_list_path_len >= 3) { |
| if (strcmp(class_list_path + class_list_path_len - 3, "lib") != 0) { |
| strcat(class_list_path, os::file_separator()); |
| strcat(class_list_path, "lib"); |
| } |
| } |
| strcat(class_list_path, os::file_separator()); |
| strcat(class_list_path, "classlist"); |
| |
| FILE* file = fopen(class_list_path, "r"); |
| if (file != NULL) { |
| jlong computed_jsum = JSUM_SEED; |
| jlong file_jsum = 0; |
| |
| char class_name[256]; |
| int class_count = 0; |
| GrowableArray<Klass*>* class_promote_order = new GrowableArray<Klass*>(); |
| |
| // sun.io.Converters |
| static const char obj_array_sig[] = "[[Ljava/lang/Object;"; |
| SymbolTable::new_permanent_symbol(obj_array_sig, THREAD); |
| |
| // java.util.HashMap |
| static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;"; |
| SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD); |
| |
| tty->print("Loading classes to share ... "); |
| while ((fgets(class_name, sizeof class_name, file)) != NULL) { |
| if (*class_name == '#') { |
| jint fsh, fsl; |
| if (sscanf(class_name, "# %8x%8x\n", &fsh, &fsl) == 2) { |
| file_jsum = ((jlong)(fsh) << 32) | (fsl & 0xffffffff); |
| } |
| |
| continue; |
| } |
| // Remove trailing newline |
| size_t name_len = strlen(class_name); |
| class_name[name_len-1] = '\0'; |
| |
| computed_jsum = jsum(computed_jsum, class_name, (const int)name_len - 1); |
| |
| // Got a class name - load it. |
| TempNewSymbol class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD); |
| guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol."); |
| Klass* klass = SystemDictionary::resolve_or_null(class_name_symbol, |
| THREAD); |
| guarantee(!HAS_PENDING_EXCEPTION, "Exception resolving a class."); |
| if (klass != NULL) { |
| if (PrintSharedSpaces && Verbose && WizardMode) { |
| tty->print_cr("Shared spaces preloaded: %s", class_name); |
| } |
| |
| |
| InstanceKlass* ik = InstanceKlass::cast(klass); |
| |
| // Should be class load order as per -XX:+TraceClassLoadingPreorder |
| class_promote_order->append(ik); |
| |
| // Link the class to cause the bytecodes to be rewritten and the |
| // cpcache to be created. The linking is done as soon as classes |
| // are loaded in order that the related data structures (klass and |
| // cpCache) are located together. |
| |
| if (ik->init_state() < InstanceKlass::linked) { |
| ik->link_class(THREAD); |
| guarantee(!(HAS_PENDING_EXCEPTION), "exception in class rewriting"); |
| } |
| |
| // TODO: Resolve klasses in constant pool |
| ik->constants()->resolve_class_constants(THREAD); |
| |
| class_count++; |
| } else { |
| if (PrintSharedSpaces && Verbose && WizardMode) { |
| tty->cr(); |
| tty->print_cr(" Preload failed: %s", class_name); |
| } |
| } |
| file_jsum = 0; // Checksum must be on last line of file |
| } |
| if (computed_jsum != file_jsum) { |
| tty->cr(); |
| tty->print_cr("Preload failed: checksum of class list was incorrect."); |
| exit(1); |
| } |
| |
| tty->print_cr("done. "); |
| |
| if (PrintSharedSpaces) { |
| tty->print_cr("Shared spaces: preloaded %d classes", class_count); |
| } |
| |
| // Rewrite and unlink classes. |
| tty->print("Rewriting and linking classes ... "); |
| |
| // Link any classes which got missed. (It's not quite clear why |
| // they got missed.) This iteration would be unsafe if we weren't |
| // single-threaded at this point; however we can't do it on the VM |
| // thread because it requires object allocation. |
| SystemDictionary::classes_do(link_shared_classes, CATCH); |
| tty->print_cr("done. "); |
| |
| // Create and dump the shared spaces. Everything so far is loaded |
| // with the null class loader. |
| ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); |
| VM_PopulateDumpSharedSpace op(loader_data, class_promote_order); |
| VMThread::execute(&op); |
| |
| } else { |
| char errmsg[JVM_MAXPATHLEN]; |
| os::lasterror(errmsg, JVM_MAXPATHLEN); |
| tty->print_cr("Loading classlist failed: %s", errmsg); |
| exit(1); |
| } |
| |
| // Since various initialization steps have been undone by this process, |
| // it is not reasonable to continue running a java process. |
| exit(0); |
| } |
| |
| |
| // Closure for serializing initialization data in from a data area |
| // (ptr_array) read from the shared file. |
| |
| class ReadClosure : public SerializeClosure { |
| private: |
| intptr_t** _ptr_array; |
| |
| inline intptr_t nextPtr() { |
| return *(*_ptr_array)++; |
| } |
| |
| public: |
| ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; } |
| |
| void do_ptr(void** p) { |
| assert(*p == NULL, "initializing previous initialized pointer."); |
| intptr_t obj = nextPtr(); |
| assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, |
| "hit tag while initializing ptrs."); |
| *p = (void*)obj; |
| } |
| |
| void do_tag(int tag) { |
| int old_tag; |
| old_tag = (int)(intptr_t)nextPtr(); |
| // do_int(&old_tag); |
| assert(tag == old_tag, "old tag doesn't match"); |
| FileMapInfo::assert_mark(tag == old_tag); |
| } |
| |
| void do_region(u_char* start, size_t size) { |
| assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment"); |
| assert(size % sizeof(intptr_t) == 0, "bad size"); |
| do_tag((int)size); |
| while (size > 0) { |
| *(intptr_t*)start = nextPtr(); |
| start += sizeof(intptr_t); |
| size -= sizeof(intptr_t); |
| } |
| } |
| |
| bool reading() const { return true; } |
| }; |
| |
| |
| // Save bounds of shared spaces mapped in. |
| static char* _ro_base = NULL; |
| static char* _rw_base = NULL; |
| static char* _md_base = NULL; |
| static char* _mc_base = NULL; |
| |
| // Return true if given address is in the mapped shared space. |
| bool MetaspaceShared::is_in_shared_space(const void* p) { |
| if (_ro_base == NULL || _rw_base == NULL) { |
| return false; |
| } else { |
| return ((p >= _ro_base && p < (_ro_base + SharedReadOnlySize)) || |
| (p >= _rw_base && p < (_rw_base + SharedReadWriteSize))); |
| } |
| } |
| |
| void MetaspaceShared::print_shared_spaces() { |
| gclog_or_tty->print_cr("Shared Spaces:"); |
| gclog_or_tty->print(" read-only " INTPTR_FORMAT "-" INTPTR_FORMAT, |
| _ro_base, _ro_base + SharedReadOnlySize); |
| gclog_or_tty->print(" read-write " INTPTR_FORMAT "-" INTPTR_FORMAT, |
| _rw_base, _rw_base + SharedReadWriteSize); |
| gclog_or_tty->cr(); |
| gclog_or_tty->print(" misc-data " INTPTR_FORMAT "-" INTPTR_FORMAT, |
| _md_base, _md_base + SharedMiscDataSize); |
| gclog_or_tty->print(" misc-code " INTPTR_FORMAT "-" INTPTR_FORMAT, |
| _mc_base, _mc_base + SharedMiscCodeSize); |
| gclog_or_tty->cr(); |
| } |
| |
| |
| // Map shared spaces at requested addresses and return if succeeded. |
| // Need to keep the bounds of the ro and rw space for the Metaspace::contains |
| // call, or is_in_shared_space. |
| bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) { |
| size_t image_alignment = mapinfo->alignment(); |
| |
| // Map in the shared memory and then map the regions on top of it |
| ReservedSpace shared_rs = mapinfo->reserve_shared_memory(); |
| if (!shared_rs.is_reserved()) return false; |
| |
| // Map each shared region |
| if ((_ro_base = mapinfo->map_region(ro)) != NULL && |
| (_rw_base = mapinfo->map_region(rw)) != NULL && |
| (_md_base = mapinfo->map_region(md)) != NULL && |
| (_mc_base = mapinfo->map_region(mc)) != NULL && |
| (image_alignment == (size_t)max_alignment())) { |
| // Success (no need to do anything) |
| return true; |
| } else { |
| // If there was a failure in mapping any of the spaces, unmap the ones |
| // that succeeded |
| if (_ro_base != NULL) mapinfo->unmap_region(ro); |
| if (_rw_base != NULL) mapinfo->unmap_region(rw); |
| if (_md_base != NULL) mapinfo->unmap_region(md); |
| if (_mc_base != NULL) mapinfo->unmap_region(mc); |
| // Release the entire mapped region |
| shared_rs.release(); |
| // If -Xshare:on is specified, print out the error message and exit VM, |
| // otherwise, set UseSharedSpaces to false and continue. |
| if (RequireSharedSpaces) { |
| vm_exit_during_initialization("Unable to use shared archive.", NULL); |
| } else { |
| FLAG_SET_DEFAULT(UseSharedSpaces, false); |
| } |
| return false; |
| } |
| } |
| |
| // Read the miscellaneous data from the shared file, and |
| // serialize it out to its various destinations. |
| |
| void MetaspaceShared::initialize_shared_spaces() { |
| FileMapInfo *mapinfo = FileMapInfo::current_info(); |
| |
| char* buffer = mapinfo->region_base(md); |
| |
| // Skip over (reserve space for) a list of addresses of C++ vtables |
| // for Klass objects. They get filled in later. |
| |
| void** vtbl_list = (void**)buffer; |
| buffer += MetaspaceShared::vtbl_list_size * sizeof(void*); |
| Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); |
| |
| // Skip over (reserve space for) dummy C++ vtables Klass objects. |
| // They are used as is. |
| |
| intptr_t vtable_size = *(intptr_t*)buffer; |
| buffer += sizeof(intptr_t); |
| buffer += vtable_size; |
| |
| // Create the symbol table using the bucket array at this spot in the |
| // misc data space. Since the symbol table is often modified, this |
| // region (of mapped pages) will be copy-on-write. |
| |
| int symbolTableLen = *(intptr_t*)buffer; |
| buffer += sizeof(intptr_t); |
| int number_of_entries = *(intptr_t*)buffer; |
| buffer += sizeof(intptr_t); |
| SymbolTable::create_table((HashtableBucket<mtSymbol>*)buffer, symbolTableLen, |
| number_of_entries); |
| buffer += symbolTableLen; |
| |
| // Create the shared dictionary using the bucket array at this spot in |
| // the misc data space. Since the shared dictionary table is never |
| // modified, this region (of mapped pages) will be (effectively, if |
| // not explicitly) read-only. |
| |
| int sharedDictionaryLen = *(intptr_t*)buffer; |
| buffer += sizeof(intptr_t); |
| number_of_entries = *(intptr_t*)buffer; |
| buffer += sizeof(intptr_t); |
| SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer, |
| sharedDictionaryLen, |
| number_of_entries); |
| buffer += sharedDictionaryLen; |
| |
| // Create the package info table using the bucket array at this spot in |
| // the misc data space. Since the package info table is never |
| // modified, this region (of mapped pages) will be (effectively, if |
| // not explicitly) read-only. |
| |
| int pkgInfoLen = *(intptr_t*)buffer; |
| buffer += sizeof(intptr_t); |
| number_of_entries = *(intptr_t*)buffer; |
| buffer += sizeof(intptr_t); |
| ClassLoader::create_package_info_table((HashtableBucket<mtClass>*)buffer, pkgInfoLen, |
| number_of_entries); |
| buffer += pkgInfoLen; |
| ClassLoader::verify(); |
| |
| // The following data in the shared misc data region are the linked |
| // list elements (HashtableEntry objects) for the symbol table, string |
| // table, and shared dictionary. The heap objects refered to by the |
| // symbol table, string table, and shared dictionary are permanent and |
| // unmovable. Since new entries added to the string and symbol tables |
| // are always added at the beginning of the linked lists, THESE LINKED |
| // LIST ELEMENTS ARE READ-ONLY. |
| |
| int len = *(intptr_t*)buffer; // skip over symbol table entries |
| buffer += sizeof(intptr_t); |
| buffer += len; |
| |
| len = *(intptr_t*)buffer; // skip over shared dictionary entries |
| buffer += sizeof(intptr_t); |
| buffer += len; |
| |
| len = *(intptr_t*)buffer; // skip over package info table entries |
| buffer += sizeof(intptr_t); |
| buffer += len; |
| |
| len = *(intptr_t*)buffer; // skip over package info table char[] arrays. |
| buffer += sizeof(intptr_t); |
| buffer += len; |
| |
| intptr_t* array = (intptr_t*)buffer; |
| ReadClosure rc(&array); |
| serialize(&rc); |
| |
| // Close the mapinfo file |
| mapinfo->close(); |
| } |
| |
| // JVM/TI RedefineClasses() support: |
| bool MetaspaceShared::remap_shared_readonly_as_readwrite() { |
| assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); |
| |
| if (UseSharedSpaces) { |
| // remap the shared readonly space to shared readwrite, private |
| FileMapInfo* mapinfo = FileMapInfo::current_info(); |
| if (!mapinfo->remap_shared_readonly_as_readwrite()) { |
| return false; |
| } |
| } |
| return true; |
| } |