//=====================================================================================================
// Allocation
//=====================================================================================================
char *
LargeHeapBucket::TryAllocFromNewHeapBlock(Recycler * recycler, size_t sizeCat, size_t size, ObjectInfoBits attributes, bool nothrow)
{
Assert((attributes & InternalObjectInfoBitMask) == attributes);
#ifdef RECYCLER_PAGE_HEAP
if (IsPageHeapEnabled(attributes))
{
return this->PageHeapAlloc(recycler, sizeCat, size, attributes, this->heapInfo->pageHeapMode, true);
}
#endif
LargeHeapBlock * heapBlock = AddLargeHeapBlock(sizeCat, nothrow);
if (heapBlock == nullptr)
{
return nullptr;
}
char * memBlock = heapBlock->Alloc(sizeCat, attributes);
Assert(memBlock != nullptr);
return memBlock;
}
char*
LargeHeapBucket::PageHeapAlloc(Recycler * recycler, size_t sizeCat, size_t size, ObjectInfoBits attributes, PageHeapMode mode, bool nothrow)
{
Segment * segment;
size_t pageCount = LargeHeapBlock::GetPagesNeeded(size, false);
if (pageCount == 0)
{
if (nothrow == false)
{
// overflow
// Since nothrow is false here, it's okay to throw
recycler->OutOfMemory();
}
return nullptr;
}
if(size<sizeof(void*))
{
attributes = (ObjectInfoBits)(attributes | LeafBit);
}
size_t actualPageCount = pageCount + 1; // 1 for guard page
auto pageAllocator = recycler->GetRecyclerLargeBlockPageAllocator();
char * baseAddress = pageAllocator->Alloc(&actualPageCount, &segment);
if (baseAddress == nullptr)
{
return nullptr;
}
size_t guardPageCount = actualPageCount - pageCount; // pageAllocator can return more than asked pages
char* address = nullptr;
char* guardPageAddress = nullptr;
if (heapInfo->pageHeapMode == PageHeapMode::PageHeapModeBlockStart)
{
address = baseAddress + AutoSystemInfo::PageSize * guardPageCount;
guardPageAddress = baseAddress;
}
else if (heapInfo->pageHeapMode == PageHeapMode::PageHeapModeBlockEnd)
{
address = baseAddress;
guardPageAddress = baseAddress + pageCount * AutoSystemInfo::PageSize;
}
else
{
AnalysisAssert(false);
}
LargeHeapBlock * heapBlock = LargeHeapBlock::New(address, pageCount, segment, 1, nullptr);
if (!heapBlock)
{
pageAllocator->SuspendIdleDecommit();
pageAllocator->Release(baseAddress, actualPageCount, segment);
pageAllocator->ResumeIdleDecommit();
return nullptr;
}
heapBlock->heapInfo = this->heapInfo;
heapBlock->actualPageCount = actualPageCount;
heapBlock->guardPageAddress = guardPageAddress;
// fill pattern before set pageHeapMode, so background scan stack may verify the pattern
size_t usedSpace = sizeof(LargeObjectHeader) + size;
memset(address + usedSpace, 0xF0, pageCount * AutoSystemInfo::PageSize - usedSpace);
heapBlock->pageHeapMode = heapInfo->pageHeapMode;
if (!recycler->heapBlockMap.SetHeapBlock(address, pageCount, heapBlock, HeapBlock::HeapBlockType::LargeBlockType, 0))
{
pageAllocator->SuspendIdleDecommit();
heapBlock->ReleasePages(recycler);
pageAllocator->ResumeIdleDecommit();
LargeHeapBlock::Delete(heapBlock);
return nullptr;
}
heapBlock->ResetMarks(ResetMarkFlags_None, recycler);
char * memBlock = heapBlock->Alloc(size, attributes);
Assert(memBlock != nullptr);
#pragma prefast(suppress:6250, "This method decommits memory")
if (::VirtualFree(guardPageAddress, AutoSystemInfo::PageSize * guardPageCount, MEM_DECOMMIT) == FALSE)
{
AssertMsg(false, "Unable to decommit guard page.");
ReportFatalException(NULL, E_FAIL, Fatal_Internal_Error, 2);
return nullptr;
}
if (this->largePageHeapBlockList)
{
HeapBlockList::Tail(this->largePageHeapBlockList)->SetNextBlock(heapBlock);
}
else
{
this->largePageHeapBlockList = heapBlock;
}
#if ENABLE_PARTIAL_GC
recycler->autoHeap.uncollectedNewPageCount += pageCount;
#endif
RECYCLER_SLOW_CHECK(this->heapInfo->heapBlockCount[HeapBlock::HeapBlockType::LargeBlockType]++);
RECYCLER_PERF_COUNTER_ADD(FreeObjectSize, heapBlock->GetPageCount() * AutoSystemInfo::PageSize);
if (recycler->ShouldCapturePageHeapAllocStack())
{
heapBlock->CapturePageHeapAllocStack();
}
return memBlock;
}
char*
LargeHeapBucket::PageHeapAlloc(Recycler * recycler, size_t size, ObjectInfoBits attributes, PageHeapMode mode, bool nothrow)
{
size_t sizeCat = HeapInfo::GetAlignedSizeNoCheck(size);
Segment * segment;
size_t pageCount = LargeHeapBlock::GetPagesNeeded(size, this->supportFreeList);
if (pageCount == 0)
{
if (nothrow == false)
{
// overflow
// Since nothrow is false here, it's okay to throw
recycler->OutOfMemory();
}
return nullptr;
}
size_t actualPageCount = pageCount + 1; // for page heap
char * baseAddress = recycler->GetRecyclerLargeBlockPageAllocator()->Alloc(&actualPageCount, &segment);
if (baseAddress == nullptr)
{
return nullptr;
}
char* address = nullptr;
char* guardPageAddress = nullptr;
DWORD guardPageOldProtectFlags = PAGE_NOACCESS;
if (heapInfo->pageHeapMode == PageHeapMode::PageHeapModeBlockStart)
{
address = baseAddress + AutoSystemInfo::PageSize;
guardPageAddress = baseAddress;
}
else if (heapInfo->pageHeapMode == PageHeapMode::PageHeapModeBlockEnd)
{
address = baseAddress;
guardPageAddress = baseAddress + pageCount* AutoSystemInfo::PageSize;
}
else
{
AnalysisAssert(false);
}
if (::VirtualProtect(static_cast<LPVOID>(guardPageAddress), AutoSystemInfo::PageSize, PAGE_NOACCESS, &guardPageOldProtectFlags) == FALSE)
{
AssertMsg(false, "Unable to set permission for guard page.");
return nullptr;
}
#ifdef RECYCLER_ZERO_MEM_CHECK
recycler->VerifyZeroFill(address, pageCount * AutoSystemInfo::PageSize);
#endif
LargeHeapBlock * heapBlock = LargeHeapBlock::New(address, pageCount, segment, 1, nullptr);
if (!heapBlock)
{
recycler->GetRecyclerLargeBlockPageAllocator()->SuspendIdleDecommit();
recycler->GetRecyclerLargeBlockPageAllocator()->Release(address, actualPageCount, segment);
recycler->GetRecyclerLargeBlockPageAllocator()->ResumeIdleDecommit();
return nullptr;
}
heapBlock->actualPageCount = actualPageCount;
heapBlock->guardPageAddress = guardPageAddress;
heapBlock->guardPageOldProtectFlags = guardPageOldProtectFlags;
heapBlock->pageHeapMode = heapInfo->pageHeapMode;
if (heapBlock->pageHeapMode == PageHeapMode::PageHeapModeBlockEnd)
{
// TODO: pad the address to close-most to the guard page to increase the chance to hit guard page when overflow
// some Mark code need to be updated to support this
// heapBlock->SetEndAllocAddress(address
// + AutoSystemInfo::PageSize - (((AllocSizeMath::Add(sizeCat, sizeof(LargeObjectHeader)) - 1) % AutoSystemInfo::PageSize) / HeapInfo::ObjectGranularity + 1) * HeapInfo::ObjectGranularity);
}
#if DBG
LargeAllocationVerboseTrace(recycler->GetRecyclerFlagsTable(), _u("Allocated new large heap block 0x%p for sizeCat 0x%x\n"), heapBlock, sizeCat);
#endif
#ifdef ENABLE_JS_ETW
#if ENABLE_DEBUG_CONFIG_OPTIONS
if (segment->GetPageCount() > recycler->GetRecyclerLargeBlockPageAllocator()->GetMaxAllocPageCount())
{
EventWriteJSCRIPT_INTERNAL_RECYCLER_EXTRALARGE_OBJECT_ALLOC(size);
}
#endif
#endif
#if ENABLE_PARTIAL_GC
recycler->autoHeap.uncollectedNewPageCount += pageCount;
#endif
RECYCLER_SLOW_CHECK(this->heapInfo->heapBlockCount[HeapBlock::HeapBlockType::LargeBlockType]++);
heapBlock->heapInfo = this->heapInfo;
Assert(recycler->collectionState != CollectionStateMark);
if (!recycler->heapBlockMap.SetHeapBlock(address, pageCount, heapBlock, HeapBlock::HeapBlockType::LargeBlockType, 0))
{
recycler->GetRecyclerLargeBlockPageAllocator()->SuspendIdleDecommit();
heapBlock->ReleasePages<true>(recycler);
recycler->GetRecyclerLargeBlockPageAllocator()->ResumeIdleDecommit();
LargeHeapBlock::Delete(heapBlock);
RECYCLER_SLOW_CHECK(this->heapInfo->heapBlockCount[HeapBlock::HeapBlockType::LargeBlockType]--);
return nullptr;
}
heapBlock->ResetMarks(ResetMarkFlags_None, recycler);
if (this->largePageHeapBlockList)
{
HeapBlockList::Tail(this->largePageHeapBlockList)->SetNextBlock(heapBlock);
}
else
{
this->largePageHeapBlockList = heapBlock;
}
RECYCLER_PERF_COUNTER_ADD(FreeObjectSize, heapBlock->GetPageCount() * AutoSystemInfo::PageSize);
char * memBlock = heapBlock->Alloc(sizeCat, attributes);
Assert(memBlock != nullptr);
if (recycler->ShouldCapturePageHeapAllocStack())
{
heapBlock->CapturePageHeapAllocStack();
}
return memBlock;
}
