/*

 * Copyright (c) 2003, 2011, 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 "gc_implementation/shared/markSweep.inline.hpp"

#include "interpreter/interpreter.hpp"

#include "memory/gcLocker.hpp"

#include "memory/resourceArea.hpp"

#include "oops/constMethodKlass.hpp"

#include "oops/constMethodOop.hpp"

#include "oops/oop.inline.hpp"

#include "oops/oop.inline2.hpp"

#include "runtime/handles.inline.hpp"

klassOop constMethodKlass::create_klass(TRAPS) {

  constMethodKlass o;

  KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());

  KlassHandle k = base_create_klass(h_this_klass, header_size(),

                                    o.vtbl_value(), CHECK_NULL);

  // Make sure size calculation is right

  assert(k()->size() == align_object_size(header_size()),

         "wrong size for object");

  //java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror

  return k();

}

int constMethodKlass::oop_size(oop obj) const {

  assert(obj->is_constMethod(), "must be constMethod oop");

  return constMethodOop(obj)->object_size();

}

bool constMethodKlass::oop_is_parsable(oop obj) const {

  assert(obj->is_constMethod(), "must be constMethod oop");

  return constMethodOop(obj)->object_is_parsable();

}

bool constMethodKlass::oop_is_conc_safe(oop obj) const {

  assert(obj->is_constMethod(), "must be constMethod oop");

  return constMethodOop(obj)->is_conc_safe();

}

constMethodOop constMethodKlass::allocate(int byte_code_size,

                                          int compressed_line_number_size,

                                          int localvariable_table_length,

                                          int checked_exceptions_length,

                                          bool is_conc_safe,

                                          TRAPS) {

  int size = constMethodOopDesc::object_size(byte_code_size,

                                             compressed_line_number_size,

                                             localvariable_table_length,

                                             checked_exceptions_length);

  KlassHandle h_k(THREAD, as_klassOop());

  constMethodOop cm = (constMethodOop)

    CollectedHeap::permanent_obj_allocate(h_k, size, CHECK_NULL);

  assert(!cm->is_parsable(), "Not yet safely parsable");

  No_Safepoint_Verifier no_safepoint;

  cm->set_interpreter_kind(Interpreter::invalid);

  cm->init_fingerprint();

  cm->set_method(NULL);

  cm->set_stackmap_data(NULL);

  cm->set_exception_table(NULL);

  cm->set_code_size(byte_code_size);

  cm->set_constMethod_size(size);

  cm->set_inlined_tables_length(checked_exceptions_length,

                                compressed_line_number_size,

                                localvariable_table_length);

  assert(cm->size() == size, "wrong size for object");

  cm->set_is_conc_safe(is_conc_safe);

  cm->set_partially_loaded();

  assert(cm->is_parsable(), "Is safely parsable by gc");

  return cm;

}

void constMethodKlass::oop_follow_contents(oop obj) {

  assert (obj->is_constMethod(), "object must be constMethod");

  constMethodOop cm = constMethodOop(obj);

  MarkSweep::mark_and_push(cm->adr_method());

  MarkSweep::mark_and_push(cm->adr_stackmap_data());

  MarkSweep::mark_and_push(cm->adr_exception_table());

  // Performance tweak: We skip iterating over the klass pointer since we

  // know that Universe::constMethodKlassObj never moves.

}

#ifndef SERIALGC

void constMethodKlass::oop_follow_contents(ParCompactionManager* cm,

                                           oop obj) {

  assert (obj->is_constMethod(), "object must be constMethod");

  constMethodOop cm_oop = constMethodOop(obj);

  PSParallelCompact::mark_and_push(cm, cm_oop->adr_method());

  PSParallelCompact::mark_and_push(cm, cm_oop->adr_stackmap_data());

  PSParallelCompact::mark_and_push(cm, cm_oop->adr_exception_table());

  // Performance tweak: We skip iterating over the klass pointer since we

  // know that Universe::constMethodKlassObj never moves.

}

#endif // SERIALGC

int constMethodKlass::oop_oop_iterate(oop obj, OopClosure* blk) {

  assert (obj->is_constMethod(), "object must be constMethod");

  constMethodOop cm = constMethodOop(obj);

  blk->do_oop(cm->adr_method());

  blk->do_oop(cm->adr_stackmap_data());

  blk->do_oop(cm->adr_exception_table());

  // Get size before changing pointers.

  // Don't call size() or oop_size() since that is a virtual call.

  int size = cm->object_size();

  return size;

}

int constMethodKlass::oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {

  assert (obj->is_constMethod(), "object must be constMethod");

  constMethodOop cm = constMethodOop(obj);

  oop* adr;

  adr = cm->adr_method();

  if (mr.contains(adr)) blk->do_oop(adr);

  adr = cm->adr_stackmap_data();

  if (mr.contains(adr)) blk->do_oop(adr);

  adr = cm->adr_exception_table();

  if (mr.contains(adr)) blk->do_oop(adr);

  // Get size before changing pointers.

  // Don't call size() or oop_size() since that is a virtual call.

  int size = cm->object_size();

  // Performance tweak: We skip iterating over the klass pointer since we

  // know that Universe::constMethodKlassObj never moves.

  return size;

}

int constMethodKlass::oop_adjust_pointers(oop obj) {

  assert(obj->is_constMethod(), "should be constMethod");

  constMethodOop cm = constMethodOop(obj);

  MarkSweep::adjust_pointer(cm->adr_method());

  MarkSweep::adjust_pointer(cm->adr_stackmap_data());

  MarkSweep::adjust_pointer(cm->adr_exception_table());

  // Get size before changing pointers.

  // Don't call size() or oop_size() since that is a virtual call.

  int size = cm->object_size();

  // Performance tweak: We skip iterating over the klass pointer since we

  // know that Universe::constMethodKlassObj never moves.

  return size;

}

#ifndef SERIALGC

void constMethodKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {

  assert(obj->is_constMethod(), "should be constMethod");

}

int constMethodKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {

  assert(obj->is_constMethod(), "should be constMethod");

  constMethodOop cm_oop = constMethodOop(obj);

  oop* const beg_oop = cm_oop->oop_block_beg();

  oop* const end_oop = cm_oop->oop_block_end();

  for (oop* cur_oop = beg_oop; cur_oop < end_oop; ++cur_oop) {

    PSParallelCompact::adjust_pointer(cur_oop);

  }

  return cm_oop->object_size();

}

#endif // SERIALGC

// Printing

void constMethodKlass::oop_print_on(oop obj, outputStream* st) {

  ResourceMark rm;

  assert(obj->is_constMethod(), "must be constMethod");

  Klass::oop_print_on(obj, st);

  constMethodOop m = constMethodOop(obj);

  st->print(" - method:       " INTPTR_FORMAT " ", (address)m->method());

  m->method()->print_value_on(st); st->cr();

  st->print(" - exceptions:   " INTPTR_FORMAT "\n", (address)m->exception_table());

  if (m->has_stackmap_table()) {

    st->print(" - stackmap data:       ");

    m->stackmap_data()->print_value_on(st);

    st->cr();

  }

}

// Short version of printing constMethodOop - just print the name of the

// method it belongs to.

void constMethodKlass::oop_print_value_on(oop obj, outputStream* st) {

  assert(obj->is_constMethod(), "must be constMethod");

  constMethodOop m = constMethodOop(obj);

  st->print(" const part of method " );

  m->method()->print_value_on(st);

}

const char* constMethodKlass::internal_name() const {

  return "{constMethod}";

}

// Verification

void constMethodKlass::oop_verify_on(oop obj, outputStream* st) {

  Klass::oop_verify_on(obj, st);

  guarantee(obj->is_constMethod(), "object must be constMethod");

  constMethodOop m = constMethodOop(obj);

  guarantee(m->is_perm(),                            "should be in permspace");

  // Verification can occur during oop construction before the method or

  // other fields have been initialized.

  if (!obj->partially_loaded()) {

    guarantee(m->method()->is_perm(), "should be in permspace");

    guarantee(m->method()->is_method(), "should be method");

    typeArrayOop stackmap_data = m->stackmap_data();

    guarantee(stackmap_data == NULL ||

              stackmap_data->is_perm(),  "should be in permspace");

    guarantee(m->exception_table()->is_perm(), "should be in permspace");

    guarantee(m->exception_table()->is_typeArray(), "should be type array");

    address m_end = (address)((oop*) m + m->size());

    address compressed_table_start = m->code_end();

    guarantee(compressed_table_start <= m_end, "invalid method layout");

    address compressed_table_end = compressed_table_start;

    // Verify line number table

    if (m->has_linenumber_table()) {

      CompressedLineNumberReadStream stream(m->compressed_linenumber_table());

      while (stream.read_pair()) {

        guarantee(stream.bci() >= 0 && stream.bci() <= m->code_size(), "invalid bci in line number table");

      }

      compressed_table_end += stream.position();

    }

    guarantee(compressed_table_end <= m_end, "invalid method layout");

    // Verify checked exceptions and local variable tables

    if (m->has_checked_exceptions()) {

      u2* addr = m->checked_exceptions_length_addr();

      guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");

    }

    if (m->has_localvariable_table()) {

      u2* addr = m->localvariable_table_length_addr();

      guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");

    }

    // Check compressed_table_end relative to uncompressed_table_start

    u2* uncompressed_table_start;

    if (m->has_localvariable_table()) {

      uncompressed_table_start = (u2*) m->localvariable_table_start();

    } else {

      if (m->has_checked_exceptions()) {

        uncompressed_table_start = (u2*) m->checked_exceptions_start();

      } else {

        uncompressed_table_start = (u2*) m_end;

      }

    }

    int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;

    int max_gap = align_object_size(1)*BytesPerWord;

    guarantee(gap >= 0 && gap < max_gap, "invalid method layout");

  }

}

bool constMethodKlass::oop_partially_loaded(oop obj) const {

  assert(obj->is_constMethod(), "object must be klass");

  constMethodOop m = constMethodOop(obj);

  // check whether exception_table points to self (flag for partially loaded)

  return m->exception_table() == (typeArrayOop)obj;

}

// The exception_table is the last field set when loading an object.

void constMethodKlass::oop_set_partially_loaded(oop obj) {

  assert(obj->is_constMethod(), "object must be klass");

  constMethodOop m = constMethodOop(obj);

  // Temporarily set exception_table to point to self

  m->set_exception_table((typeArrayOop)obj);

}