/*

 * Copyright (c) 2016, 2017, 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.

 */

#ifndef SHARE_VM_AOT_AOTCODEHEAP_HPP

#define SHARE_VM_AOT_AOTCODEHEAP_HPP

#include "aot/aotCompiledMethod.hpp"

#include "classfile/symbolTable.hpp"

#include "metaprogramming/integralConstant.hpp"

#include "metaprogramming/isRegisteredEnum.hpp"

#include "oops/metadata.hpp"

#include "oops/method.hpp"

enum CodeState {

  not_set = 0, // _aot fields is not set yet

  in_use  = 1, // _aot field is set to corresponding AOTCompiledMethod

  invalid = 2  // AOT code is invalidated because dependencies failed

};

template<> struct IsRegisteredEnum<CodeState> : public TrueType {};

typedef struct {

  AOTCompiledMethod* _aot;

  CodeState _state; // State change cases: not_set->in_use, not_set->invalid

} CodeToAMethod;

class ClassLoaderData;

class AOTClass {

public:

  ClassLoaderData* _classloader;

};

typedef struct {

  int _name_offset;

  int _code_offset;

  int _meta_offset;

  int _metadata_got_offset;

  int _metadata_got_size;

  int _code_id;

} AOTMethodOffsets;

typedef struct {

  const char* _name;

  address     _code;

  aot_metadata* _meta;

  jlong*      _state_adr;

  address     _metadata_table;

  int         _metadata_size;

} AOTMethodData;

typedef struct {

  int _got_index;

  int _class_id;

  int _compiled_methods_offset;

  int _dependent_methods_offset;

  uint64_t _fingerprint;

} AOTKlassData;

typedef struct {

  int _version;

  int _class_count;

  int _method_count;

  int _klasses_got_size;

  int _metadata_got_size;

  int _oop_got_size;

  int _jvm_version_offset;

  enum {

    AOT_SHARED_VERSION = 1

  };

} AOTHeader;

typedef struct {

  enum { CONFIG_SIZE = 7 * jintSize + 11 };

  // 7 int values

  int _config_size;

  int _narrowOopShift;

  int _narrowKlassShift;

  int _contendedPaddingWidth;

  int _fieldsAllocationStyle;

  int _objectAlignment;

  int _codeSegmentSize;

  // byte[11] array map to boolean values here

  bool _debug_VM;

  bool _useCompressedOops;

  bool _useCompressedClassPointers;

  bool _compactFields;

  bool _useG1GC;

  bool _useTLAB;

  bool _useBiasedLocking;

  bool _tieredAOT;

  bool _enableContended;

  bool _restrictContended;

  bool _omitAssertions;

} AOTConfiguration;

class AOTLib : public CHeapObj<mtCode> {

  static bool _narrow_oop_shift_initialized;

  static int _narrow_oop_shift;

  static int _narrow_klass_shift;

  bool _valid;

  void* _dl_handle;

  const int _dso_id;

  const char* _name;

  // VM configuration during AOT compilation

  AOTConfiguration* _config;

  AOTHeader* _header;

  void handle_config_error(const char* format, ...) ATTRIBUTE_PRINTF(2, 3);

public:

  AOTLib(void* handle, const char* name, int dso_id);

  virtual ~AOTLib();

  static int  narrow_oop_shift() { return _narrow_oop_shift; }

  static int  narrow_klass_shift() { return _narrow_klass_shift; }

  static bool narrow_oop_shift_initialized() { return _narrow_oop_shift_initialized; }

  bool is_valid() const {

    return _valid;

  }

  const char* name() const {

    return _name;

  }

  void* dl_handle() const {

    return _dl_handle;

  }

  int id() const {

    return _dso_id;

  }

  AOTHeader* header() const {

    return _header;

  }

  AOTConfiguration* config() const {

    return _config;

  }

  void verify_config();

  void verify_flag(bool aot_flag, bool flag, const char* name);

  void verify_flag(int  aot_flag, int  flag, const char* name);

  address load_symbol(const char *name);

};

class AOTCodeHeap : public CodeHeap {

  AOTLib* _lib;

  int _aot_id;

  int _class_count;

  int _method_count;

  AOTClass* _classes;

  CodeToAMethod* _code_to_aot;

  address _code_space;

  address _code_segments;

  jlong*  _method_state;

  // Collect metaspace info: names -> address in .got section

  const char* _metaspace_names;

  address _method_metadata;

  address _methods_offsets;

  address _klasses_offsets;

  address _dependencies;

  Metadata** _klasses_got;

  Metadata** _metadata_got;

  oop*    _oop_got;

  int _klasses_got_size;

  int _metadata_got_size;

  int _oop_got_size;

  // Collect stubs info

  int* _stubs_offsets;

  bool _lib_symbols_initialized;

  void adjust_boundaries(AOTCompiledMethod* method) {

    char* low = (char*)method->code_begin();

    if (low < low_boundary()) {

      _memory.set_low_boundary(low);

      _memory.set_low(low);

    }

    char* high = (char *)method->code_end();

    if (high > high_boundary()) {

      _memory.set_high_boundary(high);

      _memory.set_high(high);

    }

    assert(_method_count > 0, "methods count should be set already");

  }

  void register_stubs();

  void link_shared_runtime_symbols();

  void link_stub_routines_symbols();

  void link_os_symbols();

  void link_graal_runtime_symbols();

  void link_global_lib_symbols();

  void link_primitive_array_klasses();

  void publish_aot(const methodHandle& mh, AOTMethodData* method_data, int code_id);

  AOTCompiledMethod* next_in_use_at(int index) const;

  // Find klass in SystemDictionary for aot metadata.

  static Klass* lookup_klass(const char* name, int len, const Method* method, Thread* THREAD);

public:

  AOTCodeHeap(AOTLib* lib);

  virtual ~AOTCodeHeap();

  AOTCompiledMethod* find_aot(address p) const;

  virtual void* find_start(void* p)     const;

  virtual CodeBlob* find_blob_unsafe(void* start) const;

  virtual void* first() const;

  virtual void* next(void *p) const;

  AOTKlassData* find_klass(InstanceKlass* ik);

  bool load_klass_data(InstanceKlass* ik, Thread* thread);

  Klass* get_klass_from_got(const char* klass_name, int klass_len, const Method* method);

  void sweep_dependent_methods(AOTKlassData* klass_data);

  bool is_dependent_method(Klass* dependee, AOTCompiledMethod* aot);

  const char* get_name_at(int offset) {

    return _metaspace_names + offset;

  }

  void oops_do(OopClosure* f);

  void metadata_do(void f(Metadata*));

  void got_metadata_do(void f(Metadata*));

#ifdef ASSERT

  bool got_contains(Metadata **p) {

    return (p >= &_metadata_got[0] && p < &_metadata_got[_metadata_got_size]) ||

           (p >= &_klasses_got[0] && p < &_klasses_got[_klasses_got_size]);

  }

#endif

  int dso_id() const { return _lib->id(); }

  int aot_id() const { return _aot_id; }

  int method_count() { return _method_count; }

  AOTCompiledMethod* get_code_desc_at_index(int index) {

    if (index < _method_count && _code_to_aot[index]._state == in_use) {

        AOTCompiledMethod* m = _code_to_aot[index]._aot;

        assert(m != NULL, "AOT method should be set");

        if (!m->is_runtime_stub()) {

          return m;

        }

    }

    return NULL;

  }

  static Method* find_method(Klass* klass, Thread* thread, const char* method_name);

  void cleanup_inline_caches();

  DEBUG_ONLY( int verify_icholder_relocations(); )

  void flush_evol_dependents_on(InstanceKlass* dependee);

  void alive_methods_do(void f(CompiledMethod* nm));

#ifndef PRODUCT

  static int klasses_seen;

  static int aot_klasses_found;

  static int aot_klasses_fp_miss;

  static int aot_klasses_cl_miss;

  static int aot_methods_found;

  static void print_statistics();

#endif

};

#endif // SHARE_VM_AOT_AOTCODEHEAP_HPP