/*

 * Copyright (c) 1997, 2013, 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_MEMORY_ALLOCATION_INLINE_HPP

#define SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP

#include "runtime/atomic.inline.hpp"

#include "runtime/os.hpp"

// Explicit C-heap memory management

void trace_heap_malloc(size_t size, const char* name, void *p);

void trace_heap_free(void *p);

#ifndef PRODUCT

// Increments unsigned long value for statistics (not atomic on MP).

inline void inc_stat_counter(volatile julong* dest, julong add_value) {

#if defined(SPARC) || defined(X86)

  // Sparc and X86 have atomic jlong (8 bytes) instructions

  julong value = Atomic::load((volatile jlong*)dest);

  value += add_value;

  Atomic::store((jlong)value, (volatile jlong*)dest);

#else

  // possible word-tearing during load/store

  *dest += add_value;

#endif

}

#endif

// allocate using malloc; will fail if no memory available

inline char* AllocateHeap(size_t size, MEMFLAGS flags, address pc = 0,

    AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {

  if (pc == 0) {

    pc = CURRENT_PC;

  }

  char* p = (char*) os::malloc(size, flags, pc);

  #ifdef ASSERT

  if (PrintMallocFree) trace_heap_malloc(size, "AllocateHeap", p);

  #endif

  if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) vm_exit_out_of_memory(size, "AllocateHeap");

  return p;

}

inline char* ReallocateHeap(char *old, size_t size, MEMFLAGS flags,

    AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) {

  char* p = (char*) os::realloc(old, size, flags, CURRENT_PC);

  #ifdef ASSERT

  if (PrintMallocFree) trace_heap_malloc(size, "ReallocateHeap", p);

  #endif

  if (p == NULL && alloc_failmode == AllocFailStrategy::EXIT_OOM) vm_exit_out_of_memory(size, "ReallocateHeap");

  return p;

}

inline void FreeHeap(void* p, MEMFLAGS memflags = mtInternal) {

  #ifdef ASSERT

  if (PrintMallocFree) trace_heap_free(p);

  #endif

  os::free(p, memflags);

}

template <MEMFLAGS F> void* CHeapObj<F>::operator new(size_t size,

      address caller_pc){

    void* p = (void*)AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC));

    if (PrintMallocFree) trace_heap_malloc(size, "CHeapObj-new", p);

#endif

  }

template <MEMFLAGS F> void* CHeapObj<F>::operator new (size_t size,

  const std::nothrow_t&  nothrow_constant, address caller_pc) {

  void* p = (void*)AllocateHeap(size, F, (caller_pc != 0 ? caller_pc : CALLER_PC),

      AllocFailStrategy::RETURN_NULL);

    if (PrintMallocFree) trace_heap_malloc(size, "CHeapObj-new", p);

    return p;

}

template <MEMFLAGS F> void CHeapObj<F>::operator delete(void* p){

}

template <class E, MEMFLAGS F>

E* ArrayAllocator<E, F>::allocate(size_t length) {

  assert(_addr == NULL, "Already in use");

  _size = sizeof(E) * length;

  _use_malloc = _size < ArrayAllocatorMallocLimit;

  if (_use_malloc) {

    _addr = AllocateHeap(_size, F);

    if (_addr == NULL && _size >=  (size_t)os::vm_allocation_granularity()) {

      // malloc failed let's try with mmap instead

      _use_malloc = false;

    } else {

      return (E*)_addr;

    }

  }

  int alignment = os::vm_allocation_granularity();

  _size = align_size_up(_size, alignment);

  _addr = os::reserve_memory(_size, NULL, alignment);

  if (_addr == NULL) {

    vm_exit_out_of_memory(_size, "Allocator (reserve)");

  }

  bool success = os::commit_memory(_addr, _size, false /* executable */);

  if (!success) {

    vm_exit_out_of_memory(_size, "Allocator (commit)");

  }

  return (E*)_addr;

}

template<class E, MEMFLAGS F>

void ArrayAllocator<E, F>::free() {

  if (_addr != NULL) {

    if (_use_malloc) {

      FreeHeap(_addr, F);

    } else {

      os::release_memory(_addr, _size);

    }

    _addr = NULL;

  }

}

#endif // SHARE_VM_MEMORY_ALLOCATION_INLINE_HPP