/*

 * 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/classListParser.hpp"

#include "classfile/classLoaderExt.hpp"

#include "classfile/dictionary.hpp"

#include "classfile/loaderConstraints.hpp"

#include "classfile/placeholders.hpp"

#include "classfile/sharedClassUtil.hpp"

#include "classfile/symbolTable.hpp"

#include "classfile/systemDictionary.hpp"

#include "classfile/systemDictionaryShared.hpp"

#include "code/codeCache.hpp"

#include "gc/shared/gcLocker.hpp"

#include "interpreter/bytecodeStream.hpp"

#include "interpreter/bytecodes.hpp"

#include "memory/filemap.hpp"

#include "memory/metaspace.hpp"

#include "memory/metaspaceShared.hpp"

#include "memory/resourceArea.hpp"

#include "oops/objArrayOop.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/timerTrace.hpp"

#include "runtime/os.hpp"

#include "runtime/signature.hpp"

#include "runtime/vmThread.hpp"

#include "runtime/vm_operations.hpp"

#include "utilities/defaultStream.hpp"

#include "utilities/hashtable.inline.hpp"

int MetaspaceShared::_max_alignment = 0;

ReservedSpace* MetaspaceShared::_shared_rs = NULL;

MetaspaceSharedStats MetaspaceShared::_stats;

bool MetaspaceShared::_link_classes_made_progress;

bool MetaspaceShared::_check_classes_made_progress;

bool MetaspaceShared::_has_error_classes;

bool MetaspaceShared::_archive_loading_failed = false;

bool MetaspaceShared::_remapped_readwrite = false;

address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;

size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;

SharedMiscRegion MetaspaceShared::_mc;

SharedMiscRegion MetaspaceShared::_md;

SharedMiscRegion MetaspaceShared::_od;

void SharedMiscRegion::initialize(ReservedSpace rs, size_t committed_byte_size,  SharedSpaceType space_type) {

  _vs.initialize(rs, committed_byte_size);

  _alloc_top = _vs.low();

  _space_type = space_type;

}

// NOT thread-safe, but this is called during dump time in single-threaded mode.

char* SharedMiscRegion::alloc(size_t num_bytes) {

  assert(DumpSharedSpaces, "dump time only");

  size_t alignment = sizeof(char*);

  num_bytes = align_size_up(num_bytes, alignment);

  _alloc_top = (char*)align_ptr_up(_alloc_top, alignment);

  if (_alloc_top + num_bytes > _vs.high()) {

    report_out_of_shared_space(_space_type);

  }

  char* p = _alloc_top;

  _alloc_top += num_bytes;

  memset(p, 0, num_bytes);

  return p;

}

void MetaspaceShared::initialize_shared_rs(ReservedSpace* rs) {

  assert(DumpSharedSpaces, "dump time only");

  _shared_rs = rs;

  size_t core_spaces_size = FileMapInfo::core_spaces_size();

  size_t metadata_size = SharedReadOnlySize + SharedReadWriteSize;

  // Split into the core and optional sections

  ReservedSpace core_data = _shared_rs->first_part(core_spaces_size);

  ReservedSpace optional_data = _shared_rs->last_part(core_spaces_size);

  // The RO/RW and the misc sections

  ReservedSpace shared_ro_rw = core_data.first_part(metadata_size);

  ReservedSpace misc_section = core_data.last_part(metadata_size);

  // Now split the misc code and misc data sections.

  ReservedSpace md_rs   = misc_section.first_part(SharedMiscDataSize);

  ReservedSpace mc_rs   = misc_section.last_part(SharedMiscDataSize);

  _md.initialize(md_rs, SharedMiscDataSize, SharedMiscData);

  _mc.initialize(mc_rs, SharedMiscCodeSize, SharedMiscCode);

  _od.initialize(optional_data, metadata_size, SharedOptional);

}

// Read/write a data stream for restoring/preserving metadata pointers and

// miscellaneous data from/to the shared archive file.

void MetaspaceShared::serialize(SerializeClosure* soc, GrowableArray<MemRegion> *string_space,

                                size_t* space_size) {

  int tag = 0;

  soc->do_tag(--tag);

  // 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);

  // Dump/restore the symbol and string tables

  SymbolTable::serialize(soc);

  StringTable::serialize(soc, string_space, space_size);

  soc->do_tag(--tag);

  soc->do_tag(666);

}

address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {

  if (DumpSharedSpaces) {

    if (_cds_i2i_entry_code_buffers == NULL) {

      _cds_i2i_entry_code_buffers = (address)misc_data_space_alloc(total_size);

      _cds_i2i_entry_code_buffers_size = total_size;

    }

  } else if (UseSharedSpaces) {

    assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");

  } else {

    return NULL;

  }

  assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");

  return _cds_i2i_entry_code_buffers;

}

// 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->is_instance_klass()) {

    // Add in the array classes too

    InstanceKlass* ik = InstanceKlass::cast(k);

    ik->array_klasses_do(collect_classes);

  }

}

static void collect_classes2(Klass* k, ClassLoaderData* class_data) {

  collect_classes(k);

}

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();

  }

}

static void rewrite_nofast_bytecode(Method* method) {

  RawBytecodeStream bcs(method);

  while (!bcs.is_last_bytecode()) {

    Bytecodes::Code opcode = bcs.raw_next();

    switch (opcode) {

    case Bytecodes::_getfield:      *bcs.bcp() = Bytecodes::_nofast_getfield;      break;

    case Bytecodes::_putfield:      *bcs.bcp() = Bytecodes::_nofast_putfield;      break;

    case Bytecodes::_aload_0:       *bcs.bcp() = Bytecodes::_nofast_aload_0;       break;

    case Bytecodes::_iload: {

      if (!bcs.is_wide()) {

        *bcs.bcp() = Bytecodes::_nofast_iload;

      }

      break;

    }

    default: break;

    }

  }

}

// Walk all methods in the class list to ensure that they won't be modified at

// run time. This includes:

// [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified

//     at run time by RewriteBytecodes/RewriteFrequentPairs

// [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.

static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {

  for (int i = 0; i < _global_klass_objects->length(); i++) {

    Klass* k = _global_klass_objects->at(i);

    if (k->is_instance_klass()) {

      InstanceKlass* ik = InstanceKlass::cast(k);

      for (int i = 0; i < ik->methods()->length(); i++) {

        Method* m = ik->methods()->at(i);

        rewrite_nofast_bytecode(m);

        Fingerprinter fp(m);

        // The side effect of this call sets method's fingerprint field.

        fp.fingerprint();

      }

    }

  }

}

//

//

//

    }

  }

}

  int n = _global_klass_objects->length();

  for (int i = 0; i < n; i++) {

    Klass* obj = _global_klass_objects->at(i);

    if (obj->is_instance_klass()) {

      InstanceKlass* ik = InstanceKlass::cast(obj);

      ConstantPool* cp = ik->constants();

      for (int j = 0; j < ik->methods()->length(); j++) {

        Method* m = ik->methods()->at(j);

      }

    } else {

    }

  }

}

// 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;