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|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*
* Generational GC handle manager. Main Entrypoint Layer.
*
* Implements generic support for external roots into a GC heap.
*
*
*/
#include "common.h"
#include "gcenv.h"
#include "gc.h"
#include "gceventstatus.h"
#include "objecthandle.h"
#include "handletablepriv.h"
#if defined(ENABLE_PERF_COUNTERS) || defined(FEATURE_EVENT_TRACE)
DWORD g_dwHandles = 0;
#endif // ENABLE_PERF_COUNTERS || FEATURE_EVENT_TRACE
/****************************************************************************
*
* FORWARD DECLARATIONS
*
****************************************************************************/
#ifdef _DEBUG
void DEBUG_PostGCScanHandler(HandleTable *pTable, const uint32_t *types, uint32_t typeCount, uint32_t condemned, uint32_t maxgen, ScanCallbackInfo *info);
void DEBUG_LogScanningStatistics(HandleTable *pTable, uint32_t level);
#endif
/*--------------------------------------------------------------------------*/
/****************************************************************************
*
* HELPER ROUTINES
*
****************************************************************************/
/*
* Table
*
* Gets and validates the table pointer from a table handle.
*
*/
__inline PTR_HandleTable Table(HHANDLETABLE hTable)
{
WRAPPER_NO_CONTRACT;
SUPPORTS_DAC;
// convert the handle to a pointer
PTR_HandleTable pTable = (PTR_HandleTable)hTable;
// sanity
_ASSERTE(pTable);
// return the table pointer
return pTable;
}
/*--------------------------------------------------------------------------*/
/****************************************************************************
*
* MAIN ENTRYPOINTS
*
****************************************************************************/
#ifndef DACCESS_COMPILE
/*
* HndCreateHandleTable
*
* Allocates and initializes a handle table.
*
*/
HHANDLETABLE HndCreateHandleTable(const uint32_t *pTypeFlags, uint32_t uTypeCount, ADIndex uADIndex)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
INJECT_FAULT(return NULL);
}
CONTRACTL_END;
// sanity
_ASSERTE(uTypeCount);
// verify that we can handle the specified number of types
// may need to increase HANDLE_MAX_INTERNAL_TYPES (by 4)
_ASSERTE(uTypeCount <= HANDLE_MAX_PUBLIC_TYPES);
// verify that segment header layout we're using fits expected size
_ASSERTE(sizeof(_TableSegmentHeader) <= HANDLE_HEADER_SIZE);
// if you hit this then TABLE LAYOUT IS BROKEN
// compute the size of the handle table allocation
uint32_t dwSize = sizeof(HandleTable) + (uTypeCount * sizeof(HandleTypeCache));
// allocate the table
HandleTable *pTable = (HandleTable *) new (nothrow) uint8_t[dwSize];
if (pTable == NULL)
return NULL;
memset (pTable, 0, dwSize);
// allocate the initial handle segment
pTable->pSegmentList = SegmentAlloc(pTable);
// if that failed then we are also out of business
if (!pTable->pSegmentList)
{
// free the table's memory and get out
delete [] (uint8_t*)pTable;
return NULL;
}
// initialize the table's lock
// We need to allow CRST_UNSAFE_SAMELEVEL, because
// during AD unload, we need to move some TableSegment from unloaded domain to default domain.
// We need to take both locks for the two HandleTable's to avoid racing with concurrent gc thread.
if (!pTable->Lock.InitNoThrow(CrstHandleTable, CrstFlags(CRST_REENTRANCY | CRST_UNSAFE_ANYMODE | CRST_DEBUGGER_THREAD | CRST_UNSAFE_SAMELEVEL)))
{
SegmentFree(pTable->pSegmentList);
delete [] (uint8_t*)pTable;
return NULL;
}
// remember how many types we are supporting
pTable->uTypeCount = uTypeCount;
// Store user data
pTable->uTableIndex = (uint32_t) -1;
pTable->uADIndex = uADIndex;
// loop over various arrays an initialize them
uint32_t u;
// initialize the type flags for the types we were passed
for (u = 0; u < uTypeCount; u++)
pTable->rgTypeFlags[u] = pTypeFlags[u];
// preinit the rest to HNDF_NORMAL
while (u < HANDLE_MAX_INTERNAL_TYPES)
pTable->rgTypeFlags[u++] = HNDF_NORMAL;
// initialize the main cache
for (u = 0; u < uTypeCount; u++)
{
// at init time, the only non-zero field in a type cache is the free index
pTable->rgMainCache[u].lFreeIndex = HANDLES_PER_CACHE_BANK;
}
#ifdef _DEBUG
// set up scanning stats
pTable->_DEBUG_iMaxGen = -1;
#endif
// all done - return the newly created table
return (HHANDLETABLE)pTable;
}
/*
* HndDestroyHandleTable
*
* Cleans up and frees the specified handle table.
*
*/
void HndDestroyHandleTable(HHANDLETABLE hTable)
{
WRAPPER_NO_CONTRACT;
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
// decrement handle count by number of handles in this table
COUNTER_ONLY(GetPerfCounters().m_GC.cHandles -= HndCountHandles(hTable));
// We are going to free the memory for this HandleTable.
// Let us reset the copy in g_pHandleTableArray to NULL.
// Otherwise, GC will think this HandleTable is still available.
// free the lock
pTable->Lock.Destroy();
// fetch the segment list and null out the list pointer
TableSegment *pSegment = pTable->pSegmentList;
pTable->pSegmentList = NULL;
// walk the segment list, freeing the segments as we go
while (pSegment)
{
// fetch the next segment
TableSegment *pNextSegment = pSegment->pNextSegment;
// free the current one and advance to the next
SegmentFree(pSegment);
pSegment = pNextSegment;
}
// free the table's memory
delete [] (uint8_t*) pTable;
}
/*
* HndSetHandleTableIndex
*
* Sets the index associated with a handle table at creation
*/
void HndSetHandleTableIndex(HHANDLETABLE hTable, uint32_t uTableIndex)
{
WRAPPER_NO_CONTRACT;
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
pTable->uTableIndex = uTableIndex;
}
#endif // !DACCESS_COMPILE
/*
* HndGetHandleTableIndex
*
* Retrieves the index associated with a handle table at creation
*/
uint32_t HndGetHandleTableIndex(HHANDLETABLE hTable)
{
WRAPPER_NO_CONTRACT;
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
_ASSERTE (pTable->uTableIndex != (uint32_t) -1); // We have not set uTableIndex yet.
return pTable->uTableIndex;
}
/*
* HndGetHandleTableIndex
*
* Retrieves the AppDomain index associated with a handle table at creation
*/
ADIndex HndGetHandleTableADIndex(HHANDLETABLE hTable)
{
WRAPPER_NO_CONTRACT;
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
return pTable->uADIndex;
}
/*
* HndGetHandleTableIndex
*
* Retrieves the AppDomain index associated with a handle table at creation
*/
GC_DAC_VISIBLE
ADIndex HndGetHandleADIndex(OBJECTHANDLE handle)
{
WRAPPER_NO_CONTRACT;
SUPPORTS_DAC;
// fetch the handle table pointer
HandleTable *pTable = Table(HndGetHandleTable(handle));
return pTable->uADIndex;
}
#ifndef DACCESS_COMPILE
/*
* HndCreateHandle
*
* Entrypoint for allocating an individual handle.
*
*/
OBJECTHANDLE HndCreateHandle(HHANDLETABLE hTable, uint32_t uType, OBJECTREF object, uintptr_t lExtraInfo)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
if (object != NULL)
{
MODE_COOPERATIVE;
}
else
{
MODE_ANY;
}
SO_INTOLERANT;
}
CONTRACTL_END;
#if defined( _DEBUG) && !defined(FEATURE_REDHAWK)
if (g_pConfig->ShouldInjectFault(INJECTFAULT_HANDLETABLE))
{
FAULT_NOT_FATAL();
return NULL;
}
#endif // _DEBUG && !FEATURE_REDHAWK
// If we are creating a variable-strength handle, verify that the
// requested variable handle type is valid.
_ASSERTE(uType != HNDTYPE_VARIABLE || IS_VALID_VHT_VALUE(lExtraInfo));
VALIDATEOBJECTREF(object);
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
// sanity check the type index
_ASSERTE(uType < pTable->uTypeCount);
// get a handle from the table's cache
OBJECTHANDLE handle = TableAllocSingleHandleFromCache(pTable, uType);
// did the allocation succeed?
if (!handle)
{
return NULL;
}
#ifdef DEBUG_DestroyedHandleValue
if (*(_UNCHECKED_OBJECTREF *)handle == DEBUG_DestroyedHandleValue)
*(_UNCHECKED_OBJECTREF *)handle = NULL;
#endif
// yep - the handle better not point at anything yet
_ASSERTE(*(_UNCHECKED_OBJECTREF *)handle == NULL);
// we are not holding the lock - check to see if there is nonzero extra info
if (lExtraInfo)
{
// initialize the user data BEFORE assigning the referent
// this ensures proper behavior if we are currently scanning
HandleQuickSetUserData(handle, lExtraInfo);
}
#if defined(ENABLE_PERF_COUNTERS) || defined(FEATURE_EVENT_TRACE)
g_dwHandles++;
#endif // defined(ENABLE_PERF_COUNTERS) || defined(FEATURE_EVENT_TRACE)
// store the reference
HndAssignHandle(handle, object);
STRESS_LOG2(LF_GC, LL_INFO1000, "CreateHandle: %p, type=%d\n", handle, uType);
// return the result
return handle;
}
#endif // !DACCESS_COMPILE
#ifdef _DEBUG
void ValidateFetchObjrefForHandle(OBJECTREF objref, ADIndex appDomainIndex)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_GC_NOTRIGGER;
STATIC_CONTRACT_SO_TOLERANT;
STATIC_CONTRACT_MODE_COOPERATIVE;
STATIC_CONTRACT_DEBUG_ONLY;
BEGIN_DEBUG_ONLY_CODE;
VALIDATEOBJECTREF (objref);
AppDomain *pDomain = SystemDomain::GetAppDomainAtIndex(appDomainIndex);
// Access to a handle in unloaded domain is not allowed
_ASSERTE(pDomain != NULL);
_ASSERTE(!pDomain->NoAccessToHandleTable());
END_DEBUG_ONLY_CODE;
}
void ValidateAssignObjrefForHandle(OBJECTREF objref, ADIndex appDomainIndex)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_GC_NOTRIGGER;
STATIC_CONTRACT_SO_TOLERANT;
STATIC_CONTRACT_MODE_COOPERATIVE;
STATIC_CONTRACT_DEBUG_ONLY;
BEGIN_DEBUG_ONLY_CODE;
VALIDATEOBJECTREF (objref);
AppDomain *pDomain = SystemDomain::GetAppDomainAtIndex(appDomainIndex);
// Access to a handle in unloaded domain is not allowed
_ASSERTE(pDomain != NULL);
_ASSERTE(!pDomain->NoAccessToHandleTable());
END_DEBUG_ONLY_CODE;
}
void ValidateAppDomainForHandle(OBJECTHANDLE handle)
{
STATIC_CONTRACT_DEBUG_ONLY;
STATIC_CONTRACT_NOTHROW;
#ifdef DEBUG_DestroyedHandleValue
// Verify that we are not trying to access freed handle.
_ASSERTE("Attempt to access destroyed handle." && *(_UNCHECKED_OBJECTREF *)handle != DEBUG_DestroyedHandleValue);
#endif
#ifdef DACCESS_COMPILE
UNREFERENCED_PARAMETER(handle);
#else
BEGIN_DEBUG_ONLY_CODE;
ADIndex id = HndGetHandleADIndex(handle);
AppDomain *pUnloadingDomain = SystemDomain::AppDomainBeingUnloaded();
if (!pUnloadingDomain || pUnloadingDomain->GetIndex() != id)
{
return;
}
if (!pUnloadingDomain->NoAccessToHandleTable())
{
return;
}
_ASSERTE (!"Access to a handle in unloaded domain is not allowed");
END_DEBUG_ONLY_CODE;
#endif // !DACCESS_COMPILE
}
#endif
#ifndef DACCESS_COMPILE
/*
* HndDestroyHandle
*
* Entrypoint for freeing an individual handle.
*
*/
void HndDestroyHandle(HHANDLETABLE hTable, uint32_t uType, OBJECTHANDLE handle)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
SO_TOLERANT;
CAN_TAKE_LOCK; // because of TableFreeSingleHandleToCache
}
CONTRACTL_END;
STRESS_LOG2(LF_GC, LL_INFO1000, "DestroyHandle: *%p->%p\n", handle, *(_UNCHECKED_OBJECTREF *)handle);
FIRE_EVENT(DestroyGCHandle, (void *)handle);
FIRE_EVENT(PrvDestroyGCHandle, (void *)handle);
// sanity check handle we are being asked to free
_ASSERTE(handle);
#ifdef _DEBUG
ValidateAppDomainForHandle(handle);
#endif
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
// sanity check the type index
_ASSERTE(uType < pTable->uTypeCount);
_ASSERTE(HandleFetchType(handle) == uType);
// return the handle to the table's cache
TableFreeSingleHandleToCache(pTable, uType, handle);
#if defined(ENABLE_PERF_COUNTERS) || defined(FEATURE_EVENT_TRACE)
g_dwHandles--;
#endif // defined(ENABLE_PERF_COUNTERS) || defined(FEATURE_EVENT_TRACE)
}
/*
* HndDestroyHandleOfUnknownType
*
* Entrypoint for freeing an individual handle whose type is unknown.
*
*/
void HndDestroyHandleOfUnknownType(HHANDLETABLE hTable, OBJECTHANDLE handle)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
SO_TOLERANT;
MODE_ANY;
}
CONTRACTL_END;
// sanity check handle we are being asked to free
_ASSERTE(handle);
#ifdef FEATURE_COMINTEROP
// If we're being asked to destroy a WinRT weak handle, that will cause a leak
// of the IWeakReference* that it holds in its extra data. Instead of using this
// API use DestroyWinRTWeakHandle instead.
_ASSERTE(HandleFetchType(handle) != HNDTYPE_WEAK_WINRT);
#endif // FEATURE_COMINTEROP
// fetch the type and then free normally
HndDestroyHandle(hTable, HandleFetchType(handle), handle);
}
/*
* HndSetHandleExtraInfo
*
* Stores owner data with handle.
*
*/
void HndSetHandleExtraInfo(OBJECTHANDLE handle, uint32_t uType, uintptr_t lExtraInfo)
{
WRAPPER_NO_CONTRACT;
// fetch the user data slot for this handle if we have the right type
uintptr_t *pUserData = HandleValidateAndFetchUserDataPointer(handle, uType);
// is there a slot?
if (pUserData)
{
// yes - store the info
*pUserData = lExtraInfo;
}
}
/*
* HndCompareExchangeHandleExtraInfo
*
* Stores owner data with handle.
*
*/
uintptr_t HndCompareExchangeHandleExtraInfo(OBJECTHANDLE handle, uint32_t uType, uintptr_t lOldExtraInfo, uintptr_t lNewExtraInfo)
{
WRAPPER_NO_CONTRACT;
// fetch the user data slot for this handle if we have the right type
uintptr_t *pUserData = HandleValidateAndFetchUserDataPointer(handle, uType);
// is there a slot?
if (pUserData)
{
// yes - attempt to store the info
return (uintptr_t)Interlocked::CompareExchangePointer((void**)pUserData, (void*)lNewExtraInfo, (void*)lOldExtraInfo);
}
_ASSERTE(!"Shouldn't be trying to call HndCompareExchangeHandleExtraInfo on handle types without extra info");
return (uintptr_t)NULL;
}
#endif // !DACCESS_COMPILE
/*
* HndGetHandleExtraInfo
*
* Retrieves owner data from handle.
*
*/
GC_DAC_VISIBLE
uintptr_t HndGetHandleExtraInfo(OBJECTHANDLE handle)
{
WRAPPER_NO_CONTRACT;
// assume zero until we actually get it
uintptr_t lExtraInfo = 0L;
// fetch the user data slot for this handle
PTR_uintptr_t pUserData = HandleQuickFetchUserDataPointer(handle);
// if we did then copy the value
if (pUserData)
{
lExtraInfo = *(pUserData);
}
// return the value to our caller
return lExtraInfo;
}
/*
* HndGetHandleTable
*
* Returns the containing table of a handle.
*
*/
HHANDLETABLE HndGetHandleTable(OBJECTHANDLE handle)
{
WRAPPER_NO_CONTRACT;
SUPPORTS_DAC;
PTR_HandleTable pTable = HandleFetchHandleTable(handle);
return (HHANDLETABLE)pTable;
}
void HndLogSetEvent(OBJECTHANDLE handle, _UNCHECKED_OBJECTREF value)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_GC_NOTRIGGER;
STATIC_CONTRACT_SO_TOLERANT;
STATIC_CONTRACT_MODE_COOPERATIVE;
#if !defined(DACCESS_COMPILE) && defined(FEATURE_EVENT_TRACE)
if (ETW_EVENT_ENABLED(MICROSOFT_WINDOWS_DOTNETRUNTIME_PRIVATE_PROVIDER_Context, SetGCHandle) ||
ETW_EVENT_ENABLED(MICROSOFT_WINDOWS_DOTNETRUNTIME_PROVIDER_Context, SetGCHandle))
{
uint32_t hndType = HandleFetchType(handle);
ADIndex appDomainIndex = HndGetHandleADIndex(handle);
AppDomain* pAppDomain = SystemDomain::GetAppDomainAtIndex(appDomainIndex);
uint32_t generation = value != 0 ? g_theGCHeap->WhichGeneration(value) : 0;
FIRE_EVENT(SetGCHandle, (void *)handle, (void *)value, hndType, generation, (uint64_t)pAppDomain);
FIRE_EVENT(PrvSetGCHandle, (void *) handle, (void *)value, hndType, generation, (uint64_t)pAppDomain);
// Also fire the things pinned by Async pinned handles
if (hndType == HNDTYPE_ASYNCPINNED)
{
// the closure passed to "WalkOverlappedObject" is not permitted to implicitly
// capture any variables in this scope, since WalkForOverlappedObject takes a bare
// function pointer and context pointer as arguments. We can still /explicitly/
// close over values in this scope by doing what the compiler would do and introduce
// a structure that contains all of the things we closed over, while passing a pointer
// to this structure as our closure's context pointer.
struct ClosureCapture
{
AppDomain* pAppDomain;
Object* overlapped;
};
ClosureCapture captured;
captured.pAppDomain = pAppDomain;
captured.overlapped = value;
GCToEEInterface::WalkAsyncPinned(value, &captured, [](Object*, Object* to, void* ctx)
{
ClosureCapture* captured = reinterpret_cast<ClosureCapture*>(ctx);
uint32_t generation = to != nullptr ? g_theGCHeap->WhichGeneration(to) : 0;
FIRE_EVENT(SetGCHandle, (void *)captured->overlapped, (void *)to, HNDTYPE_PINNED, generation, (uint64_t)captured->pAppDomain);
});
}
}
#else
UNREFERENCED_PARAMETER(handle);
UNREFERENCED_PARAMETER(value);
#endif
}
#ifndef DACCESS_COMPILE
/*
* HndWriteBarrier
*
* Resets the generation number for the handle's clump to zero.
*
*/
void HndWriteBarrier(OBJECTHANDLE handle, OBJECTREF objref)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_GC_NOTRIGGER;
STATIC_CONTRACT_SO_TOLERANT;
STATIC_CONTRACT_MODE_COOPERATIVE;
// unwrap the objectref we were given
_UNCHECKED_OBJECTREF value = OBJECTREF_TO_UNCHECKED_OBJECTREF(objref);
_ASSERTE (objref != NULL);
// find the write barrier for this handle
uint8_t *barrier = (uint8_t *)((uintptr_t)handle & HANDLE_SEGMENT_ALIGN_MASK);
// sanity
_ASSERTE(barrier);
// find the offset of this handle into the segment
uintptr_t offset = (uintptr_t)handle & HANDLE_SEGMENT_CONTENT_MASK;
// make sure it is in the handle area and not the header
_ASSERTE(offset >= HANDLE_HEADER_SIZE);
// compute the clump index for this handle
offset = (offset - HANDLE_HEADER_SIZE) / (HANDLE_SIZE * HANDLE_HANDLES_PER_CLUMP);
// Be careful to read and write the age byte via volatile operations. Otherwise the compiler has been
// observed to translate the read + conditional write sequence below into an unconditional read/write
// (utilizing a conditional register move to determine whether the write is an update or simply writes
// back what was read). This is a legal transformation for non-volatile accesses but obviously leads to a
// race condition where we can lose an update (see the comment below for the race condition).
volatile uint8_t * pClumpAge = barrier + offset;
// if this age is smaller than age of the clump, update the clump age
if (*pClumpAge != 0) // Perf optimization: if clumpAge is 0, nothing more to do
{
// find out generation
int generation = g_theGCHeap->WhichGeneration(value);
uint32_t uType = HandleFetchType(handle);
//OverlappedData need special treatment: because all user data pointed by it needs to be reported by this handle,
//its age is consider to be min age of the user data, to be simple, we just make it 0
if (uType == HNDTYPE_ASYNCPINNED)
{
generation = 0;
}
if (uType == HNDTYPE_DEPENDENT)
{
generation = 0;
}
if (*pClumpAge > (uint8_t) generation)
{
// We have to be careful here. HndWriteBarrier is not under any synchronization
// Consider the scenario where 2 threads are hitting the line below at the same
// time. Only one will win. If the winner has an older age than the loser, we
// just created a potential GC hole (The clump will not be reporting the
// youngest handle in the clump, thus GC may skip the clump). To fix this
// we just set the clump age to 0, which means that whoever wins the race
// results are the same, as GC will always look at the clump
*pClumpAge = (uint8_t)0;
}
}
}
#endif // DACCESS_COMPILE
/*
* HndEnumHandles
*
* Enumerates all handles of the specified type in the handle table.
*
* This entrypoint is provided for utility code (debugger support etc) that
* needs to enumerate all roots in the handle table.
*
*/
GC_DAC_VISIBLE_NO_MANGLE
void HndEnumHandles(HHANDLETABLE hTable, const uint32_t *puType, uint32_t uTypeCount,
HANDLESCANPROC pfnEnum, uintptr_t lParam1, uintptr_t lParam2, bool fAsync)
{
WRAPPER_NO_CONTRACT;
// fetch the handle table pointer
PTR_HandleTable pTable = Table(hTable);
// per-block scanning callback
BLOCKSCANPROC pfnBlock;
// do we need to support user data?
BOOL fEnumUserData = TypesRequireUserDataScanning(pTable, puType, uTypeCount);
if (fEnumUserData)
{
// scan all handles with user data
pfnBlock = BlockScanBlocksWithUserData;
}
else
{
// scan all handles without user data
pfnBlock = BlockScanBlocksWithoutUserData;
}
// set up parameters for handle enumeration
ScanCallbackInfo info;
info.uFlags = (fAsync? HNDGCF_ASYNC : HNDGCF_NORMAL);
info.fEnumUserData = fEnumUserData;
info.dwAgeMask = 0;
info.pCurrentSegment = NULL;
info.pfnScan = pfnEnum;
info.param1 = lParam1;
info.param2 = lParam2;
// choose a scanning method based on the async flag
TABLESCANPROC pfnScanTable = TableScanHandles;
if (fAsync)
pfnScanTable = xxxTableScanHandlesAsync;
{
// acquire the handle manager lock
CrstHolderWithState ch(&pTable->Lock);
// scan the table
pfnScanTable(pTable, puType, uTypeCount, FullSegmentIterator, pfnBlock, &info, &ch);
}
}
/*
* HndScanHandlesForGC
*
* Multiple type scanning entrypoint for GC.
*
* This entrypoint is provided for GC-time scnas of the handle table ONLY. It
* enables ephemeral scanning of the table, and optionally ages the write barrier
* as it scans.
*
*/
GC_DAC_VISIBLE_NO_MANGLE
void HndScanHandlesForGC(HHANDLETABLE hTable, HANDLESCANPROC scanProc, uintptr_t param1, uintptr_t param2,
const uint32_t *types, uint32_t typeCount, uint32_t condemned, uint32_t maxgen, uint32_t flags)
{
WRAPPER_NO_CONTRACT;
// fetch the table pointer
PTR_HandleTable pTable = Table(hTable);
// per-segment and per-block callbacks
SEGMENTITERATOR pfnSegment;
BLOCKSCANPROC pfnBlock = NULL;
// do we need to support user data?
BOOL enumUserData =
((flags & HNDGCF_EXTRAINFO) &&
TypesRequireUserDataScanning(pTable, types, typeCount));
// what type of GC are we performing?
if (condemned >= maxgen)
{
// full GC - use our full-service segment iterator
pfnSegment = FullSegmentIterator;
// see if there is a callback
if (scanProc)
{
// do we need to scan blocks with user data?
if (enumUserData)
{
// scan all with user data
pfnBlock = BlockScanBlocksWithUserData;
}
else
{
// scan all without user data
pfnBlock = BlockScanBlocksWithoutUserData;
}
}
else if (flags & HNDGCF_AGE)
{
// there is only aging to do
pfnBlock = BlockAgeBlocks;
}
}
else
{
// this is an ephemeral GC - is it g0?
if (condemned == 0)
{
// yes - do bare-bones enumeration
pfnSegment = QuickSegmentIterator;
}
else
{
// no - do normal enumeration
pfnSegment = StandardSegmentIterator;
}
// see if there is a callback
if (scanProc)
{
// there is a scan callback - scan the condemned generation
pfnBlock = BlockScanBlocksEphemeral;
}
#ifndef DACCESS_COMPILE
else if (flags & HNDGCF_AGE)
{
// there is only aging to do
pfnBlock = BlockAgeBlocksEphemeral;
}
#endif
}
// set up parameters for scan callbacks
ScanCallbackInfo info;
info.uFlags = flags;
info.fEnumUserData = enumUserData;
info.dwAgeMask = BuildAgeMask(condemned, maxgen);
info.pCurrentSegment = NULL;
info.pfnScan = scanProc;
info.param1 = param1;
info.param2 = param2;
#if defined(_DEBUG) && !defined(DACCESS_COMPILE)
info.DEBUG_BlocksScanned = 0;
info.DEBUG_BlocksScannedNonTrivially = 0;
info.DEBUG_HandleSlotsScanned = 0;
info.DEBUG_HandlesActuallyScanned = 0;
#endif
// choose a scanning method based on the async flag
TABLESCANPROC pfnScanTable = TableScanHandles;
if (flags & HNDGCF_ASYNC)
{
pfnScanTable = xxxTableScanHandlesAsync;
}
{
// lock the table down for concurrent GC only
CrstHolderWithState ch(&pTable->Lock, (flags & HNDGCF_ASYNC) != 0);
// perform the scan
pfnScanTable(pTable, types, typeCount, pfnSegment, pfnBlock, &info, &ch);
#if defined(_DEBUG) && !defined(DACCESS_COMPILE)
// update our scanning statistics for this generation
DEBUG_PostGCScanHandler(pTable, types, typeCount, condemned, maxgen, &info);
#endif
}
}
#ifndef DACCESS_COMPILE
/*
* HndResetAgeMap
*
* Service to forceably reset the age map for a set of handles.
*
* Provided for GC-time resetting the handle table's write barrier. This is not
* normally advisable, as it increases the amount of work that will be done in
* subsequent scans. Under some circumstances, however, this is precisely what is
* desired. Generally this entrypoint should only be used under some exceptional
* condition during garbage collection, like objects being demoted from a higher
* generation to a lower one.
*
*/
void HndResetAgeMap(HHANDLETABLE hTable, const uint32_t *types, uint32_t typeCount, uint32_t condemned, uint32_t maxgen, uint32_t flags)
{
WRAPPER_NO_CONTRACT;
// fetch the table pointer
HandleTable *pTable = Table(hTable);
// set up parameters for scan callbacks
ScanCallbackInfo info;
info.uFlags = flags;
info.fEnumUserData = FALSE;
info.dwAgeMask = BuildAgeMask(condemned, maxgen);
info.pCurrentSegment = NULL;
info.pfnScan = NULL;
info.param1 = 0;
info.param2 = 0;
{
// lock the table down
CrstHolderWithState ch(&pTable->Lock);
// perform the scan
TableScanHandles(pTable, types, typeCount, QuickSegmentIterator, BlockResetAgeMapForBlocks, &info, &ch);
}
}
/*
* HndVerifyTable
*
* Service to check the correctness of the handle table for a set of handles
*
* Provided for checking the correctness of handle table and the gc.
* Will validate that each handle points to a valid object.
* Will also validate that the generation of the handle is <= generation of the object.
* Cannot have == because the handle table only remembers the generation for a group of
* 16 handles.
*
*/
void HndVerifyTable(HHANDLETABLE hTable, const uint32_t *types, uint32_t typeCount, uint32_t condemned, uint32_t maxgen, uint32_t flags)
{
WRAPPER_NO_CONTRACT;
// fetch the table pointer
HandleTable *pTable = Table(hTable);
// set up parameters for scan callbacks
ScanCallbackInfo info;
info.uFlags = flags;
info.fEnumUserData = FALSE;
info.dwAgeMask = BuildAgeMask(condemned, maxgen);
info.pCurrentSegment = NULL;
info.pfnScan = NULL;
info.param1 = 0;
info.param2 = 0;
{
// lock the table down
CrstHolderWithState ch(&pTable->Lock);
// perform the scan
TableScanHandles(pTable, types, typeCount, QuickSegmentIterator, BlockVerifyAgeMapForBlocks, &info, &ch);
}
}
/*
* HndNotifyGcCycleComplete
*
* Informs the handle table that a GC has completed.
*
*/
void HndNotifyGcCycleComplete(HHANDLETABLE hTable, uint32_t condemned, uint32_t maxgen)
{
#ifdef _DEBUG
WRAPPER_NO_CONTRACT;
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
{
// lock the table down
CrstHolder ch(&pTable->Lock);
// if this was a full GC then dump a cumulative log of scanning stats
if (condemned >= maxgen)
DEBUG_LogScanningStatistics(pTable, LL_INFO10);
}
#else
LIMITED_METHOD_CONTRACT;
UNREFERENCED_PARAMETER(hTable);
UNREFERENCED_PARAMETER(condemned);
UNREFERENCED_PARAMETER(maxgen);
#endif
}
extern int getNumberOfSlots();
/*
* HndCountHandles
*
* Counts the number of handles owned by the handle table that are marked as
* "used" that are not currently residing in the handle table's cache.
*
* Provided to compute the correct value for the GC Handle perfcounter.
* The caller is responsible for acquiring the handle table's lock if
* it is necessary.
*
*/
uint32_t HndCountHandles(HHANDLETABLE hTable)
{
WRAPPER_NO_CONTRACT;
// fetch the handle table pointer
HandleTable *pTable = Table(hTable);
// initialize the count of handles in the cache to 0
uint32_t uCacheCount = 0;
// fetch the count of handles marked as "used"
uint32_t uCount = pTable->dwCount;
// loop through the main cache for each handle type
HandleTypeCache *pCache = pTable->rgMainCache;
HandleTypeCache *pCacheEnd = pCache + pTable->uTypeCount;
for (; pCache != pCacheEnd; ++pCache)
{
// get relevant indexes for the reserve bank and the free bank
int32_t lFreeIndex = pCache->lFreeIndex;
int32_t lReserveIndex = pCache->lReserveIndex;
// clamp the min free index and min reserve index to be non-negative;
// this is necessary since interlocked operations can set these variables
// to negative values, and once negative they stay negative until the
// cache is rebalanced
if (lFreeIndex < 0) lFreeIndex = 0;
if (lReserveIndex < 0) lReserveIndex = 0;
// compute the number of handles
uint32_t uHandleCount = (uint32_t)lReserveIndex + (HANDLES_PER_CACHE_BANK - (uint32_t)lFreeIndex);
// add the number of handles to the total handle count and update
// dwCount in this HandleTable
uCacheCount += uHandleCount;
}
// it is not necessary to have the lock while reading the quick cache;
// loop through the quick cache for each handle type
OBJECTHANDLE * pQuickCache = pTable->rgQuickCache;
OBJECTHANDLE * pQuickCacheEnd = pQuickCache + HANDLE_MAX_INTERNAL_TYPES;
for (; pQuickCache != pQuickCacheEnd; ++pQuickCache)
if (*pQuickCache)
++uCacheCount;
// return the number of handles marked as "used" that are not
// residing in the cache
return (uCount - uCacheCount);
}
/*
* HndCountAllHandles
*
* Counts the total number of handles that are marked as "used" that are not
* currently residing in some handle table's cache.
*
* Provided to compute the correct value for the GC Handle perfcounter.
* The 'fUseLocks' flag specifies whether to acquire each handle table's lock
* while its handles are being counted.
*
*/
uint32_t HndCountAllHandles(BOOL fUseLocks)
{
uint32_t uCount = 0;
int offset = 0;
// get number of HandleTables per HandleTableBucket
int n_slots = getNumberOfSlots();
// fetch the pointer to the head of the list
struct HandleTableMap * walk = &g_HandleTableMap;
// walk the list
while (walk)
{
int nextOffset = walk->dwMaxIndex;
int max = nextOffset - offset;
PTR_PTR_HandleTableBucket pBucket = walk->pBuckets;
PTR_PTR_HandleTableBucket pLastBucket = pBucket + max;
// loop through each slot in this node
for (; pBucket != pLastBucket; ++pBucket)
{
// if there is a HandleTableBucket in this slot
if (*pBucket)
{
// loop through the HandleTables inside this HandleTableBucket,
// and accumulate the handle count of each HandleTable
HHANDLETABLE * pTable = (*pBucket)->pTable;
HHANDLETABLE * pLastTable = pTable + n_slots;
// if the 'fUseLocks' flag is set, acquire the lock for this handle table before
// calling HndCountHandles() - this will prevent dwCount from being modified and
// it will also prevent any of the main caches from being rebalanced
if (fUseLocks)
for (; pTable != pLastTable; ++pTable)
{
CrstHolder ch(&(Table(*pTable)->Lock));
uCount += HndCountHandles(*pTable);
}
else
for (; pTable != pLastTable; ++pTable)
uCount += HndCountHandles(*pTable);
}
}
offset = nextOffset;
walk = walk->pNext;
}
//return the total number of handles in all HandleTables
return uCount;
}
BOOL Ref_HandleAsyncPinHandles(async_pin_enum_fn asyncPinCallback, void* context)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
}
CONTRACTL_END;
AsyncPinCallbackContext callbackCtx(asyncPinCallback, context);
HandleTableBucket *pBucket = g_HandleTableMap.pBuckets[0];
BOOL result = FALSE;
int limit = getNumberOfSlots();
for (int n = 0; n < limit; n ++ )
{
if (TableHandleAsyncPinHandles(Table(pBucket->pTable[n]), callbackCtx))
{
result = TRUE;
}
}
return result;
}
void Ref_RelocateAsyncPinHandles(HandleTableBucket *pSource,
HandleTableBucket *pTarget,
void (*clearIfComplete)(Object* object),
void (*setHandle)(Object* object, OBJECTHANDLE handle))
{
CONTRACTL
{
NOTHROW;
GC_TRIGGERS;
}
CONTRACTL_END;
int limit = getNumberOfSlots();
for (int n = 0; n < limit; n ++ )
{
TableRelocateAsyncPinHandles(Table(pSource->pTable[n]), Table(pTarget->pTable[n]), clearIfComplete, setHandle);
}
}
/*--------------------------------------------------------------------------*/
/****************************************************************************
*
* DEBUG SCANNING STATISTICS
*
****************************************************************************/
#ifdef _DEBUG
void DEBUG_PostGCScanHandler(HandleTable *pTable, const uint32_t *types, uint32_t typeCount, uint32_t condemned, uint32_t maxgen, ScanCallbackInfo *info)
{
LIMITED_METHOD_CONTRACT;
UNREFERENCED_PARAMETER(types);
// looks like the GC supports more generations than we expected
_ASSERTE(condemned < MAXSTATGEN);
// remember the highest generation we've seen
if (pTable->_DEBUG_iMaxGen < (int)condemned)
pTable->_DEBUG_iMaxGen = (int)condemned;
// update the statistics
pTable->_DEBUG_TotalBlocksScanned [condemned] += info->DEBUG_BlocksScanned;
pTable->_DEBUG_TotalBlocksScannedNonTrivially [condemned] += info->DEBUG_BlocksScannedNonTrivially;
pTable->_DEBUG_TotalHandleSlotsScanned [condemned] += info->DEBUG_HandleSlotsScanned;
pTable->_DEBUG_TotalHandlesActuallyScanned [condemned] += info->DEBUG_HandlesActuallyScanned;
// if this is an ephemeral GC then dump ephemeral stats for this scan right now
if (condemned < maxgen)
{
// dump a header for the stats with the condemned generation number
LOG((LF_GC, LL_INFO1000, "--------------------------------------------------------------\n"));
LOG((LF_GC, LL_INFO1000, "Ephemeral Handle Scan Summary:\n"));
LOG((LF_GC, LL_INFO1000, " Generation = %u\n", condemned));
// dump the handle types we were asked to scan
LOG((LF_GC, LL_INFO1000, " Handle Type(s) = %u", *types));
for (uint32_t u = 1; u < typeCount; u++)
LOG((LF_GC, LL_INFO1000, ",%u", types[u]));
LOG((LF_GC, LL_INFO1000, "\n"));
// dump the number of blocks and slots we scanned
uint32_t blockHandles = info->DEBUG_BlocksScanned * HANDLE_HANDLES_PER_BLOCK;
LOG((LF_GC, LL_INFO1000, " Blocks Scanned = %u (%u slots)\n", info->DEBUG_BlocksScanned, blockHandles));
// if we scanned any blocks then summarize some stats
if (blockHandles)
{
uint32_t nonTrivialBlockHandles = info->DEBUG_BlocksScannedNonTrivially * HANDLE_HANDLES_PER_BLOCK;
LOG((LF_GC, LL_INFO1000, " Blocks Examined = %u (%u slots)\n", info->DEBUG_BlocksScannedNonTrivially, nonTrivialBlockHandles));
LOG((LF_GC, LL_INFO1000, " Slots Scanned = %u\n", info->DEBUG_HandleSlotsScanned));
LOG((LF_GC, LL_INFO1000, " Handles Scanned = %u\n", info->DEBUG_HandlesActuallyScanned));
double scanRatio = ((double)info->DEBUG_HandlesActuallyScanned / (double)blockHandles) * 100.0;
LOG((LF_GC, LL_INFO1000, " Handle Scanning Ratio = %1.1lf%%\n", scanRatio));
}
// dump a footer for the stats
LOG((LF_GC, LL_INFO1000, "--------------------------------------------------------------\n"));
}
}
void DEBUG_LogScanningStatistics(HandleTable *pTable, uint32_t level)
{
WRAPPER_NO_CONTRACT;
UNREFERENCED_PARAMETER(level);
// have we done any GC's yet?
if (pTable->_DEBUG_iMaxGen >= 0)
{
// dump a header for the stats
LOG((LF_GC, level, "\n==============================================================\n"));
LOG((LF_GC, level, " Cumulative Handle Scan Summary:\n"));
// for each generation we've collected, dump the current stats
for (int i = 0; i <= pTable->_DEBUG_iMaxGen; i++)
{
int64_t totalBlocksScanned = pTable->_DEBUG_TotalBlocksScanned[i];
// dump the generation number and the number of blocks scanned
LOG((LF_GC, level, "--------------------------------------------------------------\n"));
LOG((LF_GC, level, " Condemned Generation = %d\n", i));
LOG((LF_GC, level, " Blocks Scanned = %I64u\n", totalBlocksScanned));
// if we scanned any blocks in this generation then dump some interesting numbers
if (totalBlocksScanned)
{
LOG((LF_GC, level, " Blocks Examined = %I64u\n", pTable->_DEBUG_TotalBlocksScannedNonTrivially[i]));
LOG((LF_GC, level, " Slots Scanned = %I64u\n", pTable->_DEBUG_TotalHandleSlotsScanned [i]));
LOG((LF_GC, level, " Handles Scanned = %I64u\n", pTable->_DEBUG_TotalHandlesActuallyScanned [i]));
double blocksScanned = (double) totalBlocksScanned;
double blocksExamined = (double) pTable->_DEBUG_TotalBlocksScannedNonTrivially[i];
double slotsScanned = (double) pTable->_DEBUG_TotalHandleSlotsScanned [i];
double handlesScanned = (double) pTable->_DEBUG_TotalHandlesActuallyScanned [i];
double totalSlots = (double) (totalBlocksScanned * HANDLE_HANDLES_PER_BLOCK);
LOG((LF_GC, level, " Block Scan Ratio = %1.1lf%%\n", (100.0 * (blocksExamined / blocksScanned)) ));
LOG((LF_GC, level, " Clump Scan Ratio = %1.1lf%%\n", (100.0 * (slotsScanned / totalSlots)) ));
LOG((LF_GC, level, " Scanned Clump Saturation = %1.1lf%%\n", (100.0 * (handlesScanned / slotsScanned)) ));
LOG((LF_GC, level, " Overall Handle Scan Ratio = %1.1lf%%\n", (100.0 * (handlesScanned / totalSlots)) ));
}
}
// dump a footer for the stats
LOG((LF_GC, level, "==============================================================\n\n"));
}
}
#endif // _DEBUG
#endif // !DACCESS_COMPILE
/*--------------------------------------------------------------------------*/
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