/*

 * Copyright (c) 2019, 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/systemDictionary.hpp"

#include "gc/shared/collectedHeap.hpp"

#include "gc/shared/oopStorage.hpp"

#include "gc/shared/oopStorageSet.hpp"

#include "jvmci/jvmci.hpp"

#include "jvmci/jvmciJavaClasses.hpp"

#include "jvmci/jvmciRuntime.hpp"

#include "jvmci/metadataHandleBlock.hpp"

#include "memory/universe.hpp"

MetadataHandleBlock* JVMCI::_metadata_handles = NULL;

JVMCIRuntime* JVMCI::_compiler_runtime = NULL;

JVMCIRuntime* JVMCI::_java_runtime = NULL;

bool JVMCI::can_initialize_JVMCI() {

  // Initializing JVMCI requires the module system to be initialized past phase 3.

  // The JVMCI API itself isn't available until phase 2 and ServiceLoader (which

  // JVMCI initialization requires) isn't usable until after phase 3. Testing

  // whether the system loader is initialized satisfies all these invariants.

  if (SystemDictionary::java_system_loader() == NULL) {

    return false;

  }

  assert(Universe::is_module_initialized(), "must be");

  return true;

}

void JVMCI::initialize_compiler(TRAPS) {

  if (JVMCILibDumpJNIConfig) {

    JNIJVMCI::initialize_ids(NULL);

    ShouldNotReachHere();

  }

  JVMCI::compiler_runtime()->call_getCompiler(CHECK);

}

void JVMCI::initialize_globals() {

  _metadata_handles = MetadataHandleBlock::allocate_block();

  if (UseJVMCINativeLibrary) {

    // There are two runtimes.

    _compiler_runtime = new JVMCIRuntime();

    _java_runtime = new JVMCIRuntime();

  } else {

    // There is only a single runtime

    _java_runtime = _compiler_runtime = new JVMCIRuntime();

  }

}

// Handles to objects in the Hotspot heap.

static OopStorage* object_handles() {

  return OopStorageSet::vm_global();

}

jobject JVMCI::make_global(const Handle& obj) {

  assert(!Universe::heap()->is_gc_active(), "can't extend the root set during GC");

  assert(oopDesc::is_oop(obj()), "not an oop");

  oop* ptr = object_handles()->allocate();

  jobject res = NULL;

  if (ptr != NULL) {

    assert(*ptr == NULL, "invariant");

    NativeAccess<>::oop_store(ptr, obj());

    res = reinterpret_cast<jobject>(ptr);

  } else {

    vm_exit_out_of_memory(sizeof(oop), OOM_MALLOC_ERROR,

                          "Cannot create JVMCI oop handle");

  }

  return res;

}

void JVMCI::destroy_global(jobject handle) {

  // Assert before nulling out, for better debugging.

  assert(is_global_handle(handle), "precondition");

  oop* oop_ptr = reinterpret_cast<oop*>(handle);

  NativeAccess<>::oop_store(oop_ptr, (oop)NULL);

  object_handles()->release(oop_ptr);

}

bool JVMCI::is_global_handle(jobject handle) {

  const oop* ptr = reinterpret_cast<oop*>(handle);

  return object_handles()->allocation_status(ptr) == OopStorage::ALLOCATED_ENTRY;

}

jmetadata JVMCI::allocate_handle(const methodHandle& handle) {

  assert(_metadata_handles != NULL, "uninitialized");

  MutexLocker ml(JVMCI_lock);

  return _metadata_handles->allocate_handle(handle);

}

jmetadata JVMCI::allocate_handle(const constantPoolHandle& handle) {

  assert(_metadata_handles != NULL, "uninitialized");

  MutexLocker ml(JVMCI_lock);

  return _metadata_handles->allocate_handle(handle);

}

void JVMCI::release_handle(jmetadata handle) {

  MutexLocker ml(JVMCI_lock);

  _metadata_handles->chain_free_list(handle);

}

void JVMCI::metadata_do(void f(Metadata*)) {

  if (_metadata_handles != NULL) {

    _metadata_handles->metadata_do(f);

  }

}

void JVMCI::do_unloading(bool unloading_occurred) {

  if (_metadata_handles != NULL && unloading_occurred) {

    _metadata_handles->do_unloading();

  }

}

bool JVMCI::is_compiler_initialized() {

  return compiler_runtime()->is_HotSpotJVMCIRuntime_initialized();

}

void JVMCI::shutdown() {

  if (compiler_runtime() != NULL) {

    compiler_runtime()->shutdown();

  }

}

bool JVMCI::shutdown_called() {

  if (compiler_runtime() != NULL) {

    return compiler_runtime()->shutdown_called();

  }

  return false;

}