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/*
* Copyright (c) 2003, 2008, 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 "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_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);
}
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