Mercurial > hg > graal-jvmci-8
diff src/share/vm/memory/restore.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/memory/restore.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,196 @@ +/* + * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_restore.cpp.incl" + + +// Closure for serializing initialization data in from a data area +// (oop_array) read from the shared file. + +class ReadClosure : public SerializeOopClosure { +private: + oop** _oop_array; + + inline oop nextOop() { + return *(*_oop_array)++; + } + +public: + ReadClosure(oop** oop_array) { _oop_array = oop_array; } + + void do_oop(oop* p) { + assert(SharedSkipVerify || *p == NULL || *p == Universe::klassKlassObj(), + "initializing previously initialized oop."); + oop obj = nextOop(); + assert(SharedSkipVerify || (intptr_t)obj >= 0 || (intptr_t)obj < -100, + "hit tag while initializing oops."); + assert(SharedSkipVerify || obj->is_oop_or_null(), "invalid oop"); + *p = obj; + } + + void do_ptr(void** p) { + assert(*p == NULL, "initializing previous initialized pointer."); + void* obj = nextOop(); + assert((intptr_t)obj >= 0 || (intptr_t)obj < -100, + "hit tag while initializing ptrs."); + *p = obj; + } + + void do_ptr(HeapWord** p) { do_ptr((void **) p); } + + void do_int(int* p) { + *p = (int)(intptr_t)nextOop(); + } + + void do_size_t(size_t* p) { + // Assumes that size_t and pointers are the same size. + *p = (size_t)nextOop(); + } + + void do_tag(int tag) { + int old_tag; + do_int(&old_tag); + FileMapInfo::assert_mark(tag == old_tag); + } + + void do_region(u_char* start, size_t size) { + assert((intptr_t)start % sizeof(oop) == 0, "bad alignment"); + assert(size % sizeof(oop) == 0, "bad size"); + do_tag((int)size); + while (size > 0) { + *(oop*)start = nextOop(); + start += sizeof(oop); + size -= sizeof(oop); + } + } + + bool reading() const { return true; } +}; + + +// Read the oop and miscellaneous data from the shared file, and +// serialize it out to its various destinations. + +void CompactingPermGenGen::initialize_oops() { + 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. + + // Skip over (reserve space for) dummy C++ vtables Klass objects. + // They are used as is. + + void** vtbl_list = (void**)buffer; + buffer += vtbl_list_size * sizeof(void*); + 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*)buffer, symbolTableLen, + number_of_entries); + buffer += symbolTableLen; + + // Create the string table using the bucket array at this spot in the + // misc data space. Since the string table is often modified, this + // region (of mapped pages) will be copy-on-write. + + int stringTableLen = *(intptr_t*)buffer; + buffer += sizeof(intptr_t); + number_of_entries = *(intptr_t*)buffer; + buffer += sizeof(intptr_t); + StringTable::create_table((HashtableBucket*)buffer, stringTableLen, + number_of_entries); + buffer += stringTableLen; + + // 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*)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*)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 string 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; + + oop* oop_array = (oop*)buffer; + ReadClosure rc(&oop_array); + serialize_oops(&rc); +}