/*

 * Copyright (c) 2013, 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_SERVICES_MEM_TRACKER_HPP

#define SHARE_VM_SERVICES_MEM_TRACKER_HPP

#include "services/nmtCommon.hpp"

#include "utilities/nativeCallStack.hpp"

#if !INCLUDE_NMT

#define CURRENT_PC   NativeCallStack::EMPTY_STACK

#define CALLER_PC    NativeCallStack::EMPTY_STACK

class Tracker : public StackObj {

 public:

  Tracker() { }

  void record(address addr, size_t size) { }

};

class MemTracker : AllStatic {

 public:

  static inline NMT_TrackingLevel tracking_level() { return NMT_off; }

  static inline void shutdown() { }

  static inline void init() { }

  static bool check_launcher_nmt_support(const char* value) { return true; }

  static bool verify_nmt_option() { return true; }

  static inline void* record_malloc(void* mem_base, size_t size, MEMFLAGS flag,

    const NativeCallStack& stack, NMT_TrackingLevel level) { return mem_base; }

  static inline size_t malloc_header_size(NMT_TrackingLevel level) { return 0; }

  static inline size_t malloc_header_size(void* memblock) { return 0; }

  static inline void* malloc_base(void* memblock) { return memblock; }

  static inline void* record_free(void* memblock) { return memblock; }

  static inline void record_new_arena(MEMFLAGS flag) { }

  static inline void record_arena_free(MEMFLAGS flag) { }

  static inline void record_arena_size_change(int diff, MEMFLAGS flag) { }

  static inline void record_virtual_memory_reserve(void* addr, size_t size, const NativeCallStack& stack,

                       MEMFLAGS flag = mtNone) { }

  static inline void record_virtual_memory_reserve_and_commit(void* addr, size_t size,

    const NativeCallStack& stack, MEMFLAGS flag = mtNone) { }

  static inline void record_virtual_memory_commit(void* addr, size_t size, const NativeCallStack& stack) { }

  static inline Tracker get_virtual_memory_uncommit_tracker() { return Tracker(); }

  static inline Tracker get_virtual_memory_release_tracker() { return Tracker(); }

  static inline void record_virtual_memory_type(void* addr, MEMFLAGS flag) { }

  static inline void record_thread_stack(void* addr, size_t size) { }

  static inline void release_thread_stack(void* addr, size_t size) { }

  static void final_report(outputStream*) { }

  static void error_report(outputStream*) { }

};

#else

#include "runtime/threadCritical.hpp"

#include "services/mallocTracker.hpp"

#include "services/virtualMemoryTracker.hpp"

extern volatile bool NMT_stack_walkable;

#define CURRENT_PC ((MemTracker::tracking_level() == NMT_detail && NMT_stack_walkable) ? \

                    NativeCallStack(0, true) : NativeCallStack::EMPTY_STACK)

#define CALLER_PC  ((MemTracker::tracking_level() == NMT_detail && NMT_stack_walkable) ?  \

                    NativeCallStack(1, true) : NativeCallStack::EMPTY_STACK)

class MemBaseline;

class Mutex;

// Tracker is used for guarding 'release' semantics of virtual memory operation, to avoid

// the other thread obtains and records the same region that is just 'released' by current

// thread but before it can record the operation.

class Tracker : public StackObj {

 public:

  enum TrackerType {

     uncommit,

     release

  };

 public:

  Tracker(enum TrackerType type) : _type(type) { }

  void record(address addr, size_t size);

 private:

  enum TrackerType  _type;

  // Virtual memory tracking data structures are protected by ThreadCritical lock.

  ThreadCritical    _tc;

};

class MemTracker : AllStatic {

 public:

  static inline NMT_TrackingLevel tracking_level() {

    if (_tracking_level == NMT_unknown) {

      // No fencing is needed here, since JVM is in single-threaded

      // mode.

      _tracking_level = init_tracking_level();

      _cmdline_tracking_level = _tracking_level;

    }

    return _tracking_level;

  }

  // A late initialization, for the stuff(s) can not be

  // done in init_tracking_level(), which can NOT malloc

  // any memory.

  static void init();

  // Shutdown native memory tracking

  static void shutdown();

  // Verify native memory tracking command line option.

  // This check allows JVM to detect if compatible launcher

  // is used.

  // If an incompatible launcher is used, NMT may not be

  // able to start, even it is enabled by command line option.

  // A warning message should be given if it is encountered.

  static bool check_launcher_nmt_support(const char* value);

  // This method checks native memory tracking environment

  // variable value passed by launcher.

  // Launcher only obligated to pass native memory tracking

  // option value, but not obligated to validate the value,

  // and launcher has option to discard native memory tracking

  // option from the command line once it sets up the environment

  // variable, so NMT has to catch the bad value here.

  static bool verify_nmt_option();

  // Transition the tracking level to specified level

  static bool transition_to(NMT_TrackingLevel level);

  static inline void* record_malloc(void* mem_base, size_t size, MEMFLAGS flag,

    const NativeCallStack& stack, NMT_TrackingLevel level) {

    return MallocTracker::record_malloc(mem_base, size, flag, stack, level);

  }

  static inline size_t malloc_header_size(NMT_TrackingLevel level) {

    return MallocTracker::malloc_header_size(level);

  }

  static size_t malloc_header_size(void* memblock) {

    if (tracking_level() != NMT_off) {

      return MallocTracker::get_header_size(memblock);

    }

    return 0;

  }

  // To malloc base address, which is the starting address

  // of malloc tracking header if tracking is enabled.

  // Otherwise, it returns the same address.

  static void* malloc_base(void* memblock);

  // Record malloc free and return malloc base address

  static inline void* record_free(void* memblock) {

    return MallocTracker::record_free(memblock);

  }

  // Record creation of an arena

  static inline void record_new_arena(MEMFLAGS flag) {

    if (tracking_level() < NMT_summary) return;

    MallocTracker::record_new_arena(flag);

  }

  // Record destruction of an arena

  static inline void record_arena_free(MEMFLAGS flag) {

    if (tracking_level() < NMT_summary) return;

    MallocTracker::record_arena_free(flag);

  }

  // Record arena size change. Arena size is the size of all arena

  // chuncks that backing up the arena.

  static inline void record_arena_size_change(int diff, MEMFLAGS flag) {

    if (tracking_level() < NMT_summary) return;

    MallocTracker::record_arena_size_change(diff, flag);

  }

  static inline void record_virtual_memory_reserve(void* addr, size_t size, const NativeCallStack& stack,

    MEMFLAGS flag = mtNone) {

    if (tracking_level() < NMT_summary) return;

    if (addr != NULL) {

      ThreadCritical tc;

      // Recheck to avoid potential racing during NMT shutdown

      if (tracking_level() < NMT_summary) return;

      VirtualMemoryTracker::add_reserved_region((address)addr, size, stack, flag);

    }

  }

  static inline void record_virtual_memory_reserve_and_commit(void* addr, size_t size,

    const NativeCallStack& stack, MEMFLAGS flag = mtNone) {

    if (tracking_level() < NMT_summary) return;

    if (addr != NULL) {

      ThreadCritical tc;

      if (tracking_level() < NMT_summary) return;

      VirtualMemoryTracker::add_reserved_region((address)addr, size,

        stack, flag, true);

      VirtualMemoryTracker::add_committed_region((address)addr, size, stack);

    }

  }

  static inline void record_virtual_memory_commit(void* addr, size_t size,

    const NativeCallStack& stack) {

    if (tracking_level() < NMT_summary) return;

    if (addr != NULL) {

      ThreadCritical tc;

      if (tracking_level() < NMT_summary) return;

      VirtualMemoryTracker::add_committed_region((address)addr, size, stack);

    }

  }

  static inline Tracker get_virtual_memory_uncommit_tracker() {

    assert(tracking_level() >= NMT_summary, "Check by caller");

    return Tracker(Tracker::uncommit);

  }

  static inline Tracker get_virtual_memory_release_tracker() {

    assert(tracking_level() >= NMT_summary, "Check by caller");

    return Tracker(Tracker::release);

  }

  static inline void record_virtual_memory_type(void* addr, MEMFLAGS flag) {

    if (tracking_level() < NMT_summary) return;

    if (addr != NULL) {

      ThreadCritical tc;

      if (tracking_level() < NMT_summary) return;

      VirtualMemoryTracker::set_reserved_region_type((address)addr, flag);

    }

  }

  static inline void record_thread_stack(void* addr, size_t size) {

    if (tracking_level() < NMT_summary) return;

    if (addr != NULL) {

      // uses thread stack malloc slot for book keeping number of threads

      MallocMemorySummary::record_malloc(0, mtThreadStack);

      record_virtual_memory_reserve_and_commit(addr, size, CALLER_PC, mtThreadStack);

    }

  }

  static inline void release_thread_stack(void* addr, size_t size) {

    if (tracking_level() < NMT_summary) return;

    if (addr != NULL) {

      // uses thread stack malloc slot for book keeping number of threads

      MallocMemorySummary::record_free(0, mtThreadStack);

      ThreadCritical tc;

      if (tracking_level() < NMT_summary) return;

      VirtualMemoryTracker::remove_released_region((address)addr, size);

    }

  }

  // Query lock is used to synchronize the access to tracking data.

  // So far, it is only used by JCmd query, but it may be used by

  // other tools.

  static inline Mutex* query_lock() { return _query_lock; }

  // Make a final report or report for hs_err file.

  static void error_report(outputStream* output) {

    if (tracking_level() >= NMT_summary) {

      report(true, output);  // just print summary for error case.

    }

   }

  static void final_report(outputStream* output) {

    NMT_TrackingLevel level = tracking_level();

    if (level >= NMT_summary) {

      report(level == NMT_summary, output);

    }

  }

  // Stored baseline

  static inline MemBaseline& get_baseline() {

    return _baseline;

  }

  static NMT_TrackingLevel cmdline_tracking_level() {

    return _cmdline_tracking_level;

  }

  static void tuning_statistics(outputStream* out);

 private:

  static NMT_TrackingLevel init_tracking_level();

  static void report(bool summary_only, outputStream* output);

 private:

  // Tracking level

  static volatile NMT_TrackingLevel   _tracking_level;

  // If NMT option value passed by launcher through environment

  // variable is valid

  static bool                         _is_nmt_env_valid;

  // command line tracking level

  static NMT_TrackingLevel            _cmdline_tracking_level;

  // Stored baseline

  static MemBaseline      _baseline;

  // Query lock

  static Mutex*           _query_lock;

};

#endif // INCLUDE_NMT

#endif // SHARE_VM_SERVICES_MEM_TRACKER_HPP