/****************************************************************************
Copyright (c) 2006, Radon Labs GmbH
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#if WIN32

#include "stdneb.h"
#include "memory/win360/win360heap.h"

namespace Win360
{
using namespace Threading;
using namespace Util;

#if NEBULA3_MEMORY_STATS
List<Win360Heap*>* Win360Heap::list = 0;
CriticalSection* Win360Heap::criticalSection = 0;
#endif

//------------------------------------------------------------------------------
/**
    This method must be called at the beginning of the application before
    any threads are spawned.
*/
void
Win360Heap::Setup()
{
    #if NEBULA3_MEMORY_STATS
    n_assert(0 == list);
    n_assert(0 == criticalSection);
    list = n_new(List<Win360Heap*>);
    criticalSection = n_new(CriticalSection);
    #endif
}

//------------------------------------------------------------------------------
/**
*/
Win360Heap::Win360Heap(const char* heapName, size_t initialSize, size_t maxSize)
{
    n_assert(0 != heapName);
    this->name = heapName;
    this->heap = ::HeapCreate(0, initialSize, maxSize);
    n_assert(0 != this->heap);
    
    // enable low-fragmentatio-heap (Win32 only)
    #if __WIN32__
    ULONG heapFragValue = 2;
    HeapSetInformation(this->heap, HeapCompatibilityInformation, &heapFragValue, sizeof(heapFragValue));
    #endif

    // link into Heap list
    #if NEBULA3_MEMORY_STATS
    n_assert(0 != criticalSection);
    this->allocCount = 0;
    this->allocSize  = 0;
    criticalSection->Enter();
    this->listIterator = list->AddBack(this);
    criticalSection->Leave();
    #endif
}

//------------------------------------------------------------------------------
/**
*/
Win360Heap::~Win360Heap()
{
    #if NEBULA3_MEMORY_STATS
    this->DumpLeaks();
    #endif

    BOOL success = ::HeapDestroy(this->heap);
    n_assert(0 != success);
    this->heap = 0;

    // dump memory leaks and unlink from Heap list
    #if NEBULA3_MEMORY_STATS
    n_assert(0 == this->allocCount);
    n_assert(0 != criticalSection);
    n_assert(0 != this->listIterator);
    criticalSection->Enter();
    list->Remove(this->listIterator);
    criticalSection->Leave();
    this->listIterator = 0;
    #endif   
}

#if NEBULA3_MEMORY_STATS
//------------------------------------------------------------------------------
/**
    Validate the heap. This walks over the heap's memory block and checks
    the control structures. If somethings wrong the function will
    stop the program, otherwise the functions returns true.
*/
bool
Win360Heap::ValidateHeap() const
{
    BOOL result = ::HeapValidate(this->heap, 0, NULL);
    return (0 != result);
}

//------------------------------------------------------------------------------
/**
*/
int
Win360Heap::GetAllocCount() const
{
    return this->allocCount;
}

//------------------------------------------------------------------------------
/**
*/
int
Win360Heap::GetAllocSize() const
{
    return this->allocSize;
}

//------------------------------------------------------------------------------
/**
*/
Array<Win360Heap::Stats>
Win360Heap::GetAllHeapStats()
{
    n_assert(0 != criticalSection);
    Array<Stats> result;
    criticalSection->Enter();
    List<Win360Heap*>::Iterator iter;
    for (iter = list->Begin(); iter != list->End(); iter++)
    {
        Stats stats;
        stats.name       = (*iter)->GetName();
        stats.allocCount = (*iter)->GetAllocCount();
        stats.allocSize  = (*iter)->GetAllocSize();        
        result.Append(stats);
    }
    criticalSection->Leave();
    return result;
}

//------------------------------------------------------------------------------
/**
    This static method calls the ValidateHeap() method on all heaps.
*/
bool
Win360Heap::ValidateAllHeaps()
{
    n_assert(0 != criticalSection);
    criticalSection->Enter();
    bool result = true;
    List<Win360Heap*>::Iterator iter;
    for (iter = list->Begin(); iter != list->End(); iter++)
    {
        result &= (*iter)->ValidateHeap();
    }
    criticalSection->Leave();
    return result;
}

//------------------------------------------------------------------------------
/**
    This is a helper method which walks a Windows heap and writes a
    log entry per allocated memory block to DebugOut.
*/
void
Win360Heap::DumpHeapMemoryLeaks(const char* heapName, HANDLE hHeap)
{
    PROCESS_HEAP_ENTRY walkEntry = { 0 };
    ::HeapLock(hHeap);
    bool heapMsgShown = false;
    while (::HeapWalk(hHeap, &walkEntry))
    {
        if (walkEntry.wFlags & PROCESS_HEAP_ENTRY_BUSY)
        {
            char strBuf[256];
            if (!heapMsgShown)
            {
                _snprintf(strBuf, sizeof(strBuf), "!!! HEAP MEMORY LEAKS !!! (Heap: %s)\n", heapName);
                ::OutputDebugString(strBuf);
                heapMsgShown = true;
            }
            _snprintf(strBuf, sizeof(strBuf), "addr(0x%0lx) size(%d)\n", (size_t) walkEntry.lpData, walkEntry.cbData);
            ::OutputDebugString(strBuf);
        }
    }
    ::HeapUnlock(hHeap);
}

//------------------------------------------------------------------------------
/**
    Generates a memory leak report for this heap.
*/
void
Win360Heap::DumpLeaks()
{
    n_assert(0 != this->name);
    n_assert(0 != this->heap);
    Win360Heap::DumpHeapMemoryLeaks(this->name, this->heap);
}

//------------------------------------------------------------------------------
/**
    Generates memory leaks for every heap object.
*/
void
Win360Heap::DumpLeaksAllHeaps()
{
    n_assert(0 != criticalSection);
    criticalSection->Enter();
    List<Win360Heap*>::Iterator iter;
    for (iter = list->Begin(); iter != list->End(); iter++)
    {
        (*iter)->DumpLeaks();
    }
    criticalSection->Leave();
}
#endif // NEBULA3_MEMORY_ADVANCED_DEBUGGING

} // namespace Memory

#endif