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hotspot/src/share/vm/memory/restore.cpp

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+/*
+ * 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);
+}