Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2010, 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/symbolTable.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "memory/filemap.hpp"

 #include "oops/oop.inline.hpp"

 #include "utilities/hashtable.inline.hpp"

 // 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_oop(narrowOop* p) { ShouldNotReachHere(); }

   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);

 }