/*

 * 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

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 */

#ifndef SHARE_VM_JVMCI_JVMCIENV_HPP

#define SHARE_VM_JVMCI_JVMCIENV_HPP

#include "classfile/systemDictionary.hpp"

#include "code/debugInfoRec.hpp"

#include "code/dependencies.hpp"

#include "code/exceptionHandlerTable.hpp"

#include "compiler/oopMap.hpp"

#include "runtime/thread.hpp"

class CompileTask;

// Bring the JVMCI compiler thread into the VM state.

#define JVMCI_VM_ENTRY_MARK                       \

  JavaThread* thread = JavaThread::current(); \

  ThreadInVMfromNative __tiv(thread);       \

  ResetNoHandleMark rnhm;                   \

  HandleMarkCleaner __hm(thread);           \

  Thread* THREAD = thread;                  \

  debug_only(VMNativeEntryWrapper __vew;)

#define JVMCI_EXCEPTION_CONTEXT \

  JavaThread* thread=JavaThread::current(); \

  Thread* THREAD = thread;

//

// This class is the top level broker for requests from the compiler

// to the VM.

class JVMCIEnv : StackObj {

  CI_PACKAGE_ACCESS_TO

  friend class CompileBroker;

  friend class Dependencies;  // for get_object, during logging

public:

  enum CodeInstallResult {

     ok,

     dependencies_failed,

     dependencies_invalid,

     cache_full,

     code_too_large

  };

  // Look up a klass by name from a particular class loader (the accessor's).

  // If require_local, result must be defined in that class loader, or NULL.

  // If !require_local, a result from remote class loader may be reported,

  // if sufficient class loader constraints exist such that initiating

  // a class loading request from the given loader is bound to return

  // the class defined in the remote loader (or throw an error).

  //

  // Return an unloaded klass if !require_local and no class at all is found.

  //

  // The CI treats a klass as loaded if it is consistently defined in

  // another loader, even if it hasn't yet been loaded in all loaders

  // that could potentially see it via delegation.

  static KlassHandle get_klass_by_name(KlassHandle& accessing_klass,

                             Symbol* klass_name,

                             bool require_local);

  // Constant pool access.

                                int klass_index,

                                bool& is_accessible,

                                KlassHandle& loading_klass);

  static void   get_field_by_index(instanceKlassHandle& loading_klass, fieldDescriptor& fd,

                                int field_index);

                                 int method_index, Bytecodes::Code bc,

                                 instanceKlassHandle& loading_klass);

  JVMCIEnv(CompileTask* task, int system_dictionary_modification_counter);

private:

  CompileTask*     _task;

  int              _system_dictionary_modification_counter;

  // Cache JVMTI state

  bool  _jvmti_can_hotswap_or_post_breakpoint;

  bool  _jvmti_can_access_local_variables;

  bool  _jvmti_can_post_on_exceptions;

  // Implementation methods for loading and constant pool access.

  static KlassHandle get_klass_by_name_impl(KlassHandle& accessing_klass,

                                  Symbol* klass_name,

                                  bool require_local);

                                     int klass_index,

                                     bool& is_accessible,

                                     KlassHandle& loading_klass);

  static void   get_field_by_index_impl(instanceKlassHandle& loading_klass, fieldDescriptor& fd,

                                     int field_index);

                                      int method_index, Bytecodes::Code bc,

                                      instanceKlassHandle& loading_klass);

  // Helper methods

  static bool       check_klass_accessibility(KlassHandle accessing_klass, KlassHandle resolved_klass);

  static methodHandle  lookup_method(instanceKlassHandle&  accessor,

                           instanceKlassHandle&  holder,

                           Symbol*         name,

                           Symbol*         sig,

                           Bytecodes::Code bc);

  private:

  // Is this thread currently in the VM state?

  static bool is_in_vm();

  // Helper routine for determining the validity of a compilation

  // with respect to concurrent class loading.

  static JVMCIEnv::CodeInstallResult check_for_system_dictionary_modification(Dependencies* target, Handle compiled_code,

                                                                              JVMCIEnv* env, char** failure_detail);

public:

  CompileTask* task() { return _task; }

  // Register the result of a compilation.

  static JVMCIEnv::CodeInstallResult register_method(

                       methodHandle&             target,

                       nmethod*&                 nm,

                       int                       entry_bci,

                       CodeOffsets*              offsets,

                       int                       orig_pc_offset,

                       CodeBuffer*               code_buffer,

                       int                       frame_words,

                       OopMapSet*                oop_map_set,

                       ExceptionHandlerTable*    handler_table,

                       AbstractCompiler*         compiler,

                       DebugInformationRecorder* debug_info,

                       Dependencies*             dependencies,

                       JVMCIEnv*                 env,

                       int                       compile_id,

                       bool                      has_unsafe_access,

                       bool                      has_wide_vector,

                       Handle                    installed_code,

                       Handle                    compiled_code,

                       Handle                    speculation_log);

  // converts the Klass* representing the holder of a method into a

  // InstanceKlass*.  This is needed since the holder of a method in

  // the bytecodes could be an array type.  Basically this converts

  // array types into java/lang/Object and other types stay as they are.

  static instanceKlassHandle get_instance_klass_for_declared_method_holder(KlassHandle& klass);

};

#endif // SHARE_VM_JVMCI_JVMCIENV_HPP