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|
//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
/*++
Module Name:
gc.h
--*/
#ifndef __GC_H
#define __GC_H
#ifndef BINDER
#ifdef PROFILING_SUPPORTED
#define GC_PROFILING //Turn on profiling
#endif // PROFILING_SUPPORTED
#endif
/*
* Promotion Function Prototypes
*/
typedef void enum_func (Object*);
// callback functions for heap walkers
typedef void object_callback_func(void * pvContext, void * pvDataLoc);
// stub type to abstract a heap segment
struct gc_heap_segment_stub;
typedef gc_heap_segment_stub *segment_handle;
struct segment_info
{
LPVOID pvMem; // base of the allocation, not the first object (must add ibFirstObject)
size_t ibFirstObject; // offset to the base of the first object in the segment
size_t ibAllocated; // limit of allocated memory in the segment (>= firstobject)
size_t ibCommit; // limit of committed memory in the segment (>= alllocated)
size_t ibReserved; // limit of reserved memory in the segment (>= commit)
};
/*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
/* If you modify failure_get_memory and */
/* oom_reason be sure to make the corresponding */
/* changes in toolbox\sos\strike\strike.cpp. */
/*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
enum failure_get_memory
{
fgm_no_failure = 0,
fgm_reserve_segment = 1,
fgm_commit_segment_beg = 2,
fgm_commit_eph_segment = 3,
fgm_grow_table = 4,
fgm_commit_table = 5
};
struct fgm_history
{
failure_get_memory fgm;
size_t size;
size_t available_pagefile_mb;
BOOL loh_p;
void set_fgm (failure_get_memory f, size_t s, BOOL l)
{
fgm = f;
size = s;
loh_p = l;
}
};
enum oom_reason
{
oom_no_failure = 0,
oom_budget = 1,
oom_cant_commit = 2,
oom_cant_reserve = 3,
oom_loh = 4,
oom_low_mem = 5,
oom_unproductive_full_gc = 6
};
struct oom_history
{
oom_reason reason;
size_t alloc_size;
BYTE* reserved;
BYTE* allocated;
size_t gc_index;
failure_get_memory fgm;
size_t size;
size_t available_pagefile_mb;
BOOL loh_p;
};
/* forward declerations */
class CObjectHeader;
class Object;
class GCHeap;
/* misc defines */
#define LARGE_OBJECT_SIZE ((size_t)(85000))
GPTR_DECL(GCHeap, g_pGCHeap);
#ifndef DACCESS_COMPILE
extern "C" {
#endif
GPTR_DECL(BYTE,g_lowest_address);
GPTR_DECL(BYTE,g_highest_address);
GPTR_DECL(DWORD,g_card_table);
#ifndef DACCESS_COMPILE
}
#endif
#ifdef DACCESS_COMPILE
class DacHeapWalker;
#endif
#ifdef _DEBUG
#define _LOGALLOC
#endif
#ifdef WRITE_BARRIER_CHECK
//always defined, but should be 0 in Server GC
extern BYTE* g_GCShadow;
extern BYTE* g_GCShadowEnd;
// saves the g_lowest_address in between GCs to verify the consistency of the shadow segment
extern BYTE* g_shadow_lowest_address;
#endif
#define MP_LOCKS
extern "C" BYTE* g_ephemeral_low;
extern "C" BYTE* g_ephemeral_high;
namespace WKS {
::GCHeap* CreateGCHeap();
class GCHeap;
class gc_heap;
}
#if defined(FEATURE_SVR_GC)
namespace SVR {
::GCHeap* CreateGCHeap();
class GCHeap;
class gc_heap;
}
#endif // defined(FEATURE_SVR_GC)
/*
* Ephemeral Garbage Collected Heap Interface
*/
struct alloc_context
{
friend class WKS::gc_heap;
#if defined(FEATURE_SVR_GC)
friend class SVR::gc_heap;
friend class SVR::GCHeap;
#endif // defined(FEATURE_SVR_GC)
friend struct ClassDumpInfo;
BYTE* alloc_ptr;
BYTE* alloc_limit;
INT64 alloc_bytes; //Number of bytes allocated on SOH by this context
INT64 alloc_bytes_loh; //Number of bytes allocated on LOH by this context
#if defined(FEATURE_SVR_GC)
SVR::GCHeap* alloc_heap;
SVR::GCHeap* home_heap;
#endif // defined(FEATURE_SVR_GC)
int alloc_count;
public:
void init()
{
LIMITED_METHOD_CONTRACT;
alloc_ptr = 0;
alloc_limit = 0;
alloc_bytes = 0;
alloc_bytes_loh = 0;
#if defined(FEATURE_SVR_GC)
alloc_heap = 0;
home_heap = 0;
#endif // defined(FEATURE_SVR_GC)
alloc_count = 0;
}
};
struct ScanContext
{
Thread* thread_under_crawl;
int thread_number;
BOOL promotion; //TRUE: Promotion, FALSE: Relocation.
BOOL concurrent; //TRUE: concurrent scanning
#if CHECK_APP_DOMAIN_LEAKS || defined (FEATURE_APPDOMAIN_RESOURCE_MONITORING) || defined (DACCESS_COMPILE)
AppDomain *pCurrentDomain;
#endif //CHECK_APP_DOMAIN_LEAKS || FEATURE_APPDOMAIN_RESOURCE_MONITORING || DACCESS_COMPILE
#if defined(GC_PROFILING) || defined (DACCESS_COMPILE)
MethodDesc *pMD;
#endif //GC_PROFILING || DACCESS_COMPILE
#if defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
EtwGCRootKind dwEtwRootKind;
#endif // GC_PROFILING || FEATURE_EVENT_TRACE
ScanContext()
{
LIMITED_METHOD_CONTRACT;
thread_under_crawl = 0;
thread_number = -1;
promotion = FALSE;
concurrent = FALSE;
#ifdef GC_PROFILING
pMD = NULL;
#endif //GC_PROFILING
#ifdef FEATURE_EVENT_TRACE
dwEtwRootKind = kEtwGCRootKindOther;
#endif // FEATURE_EVENT_TRACE
}
};
typedef BOOL (* walk_fn)(Object*, void*);
typedef void (* gen_walk_fn)(void *context, int generation, BYTE *range_start, BYTE * range_end, BYTE *range_reserved);
#if defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
struct ProfilingScanContext : ScanContext
{
BOOL fProfilerPinned;
LPVOID pvEtwContext;
void *pHeapId;
ProfilingScanContext(BOOL fProfilerPinnedParam) : ScanContext()
{
LIMITED_METHOD_CONTRACT;
pHeapId = NULL;
fProfilerPinned = fProfilerPinnedParam;
pvEtwContext = NULL;
#ifdef FEATURE_CONSERVATIVE_GC
// To not confuse CNameSpace::GcScanRoots
promotion = g_pConfig->GetGCConservative();
#endif
}
};
#endif // defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
#ifdef STRESS_HEAP
#define IN_STRESS_HEAP(x) x
#define STRESS_HEAP_ARG(x) ,x
#else // STRESS_HEAP
#define IN_STRESS_HEAP(x)
#define STRESS_HEAP_ARG(x)
#endif // STRESS_HEAP
//dynamic data interface
struct gc_counters
{
size_t current_size;
size_t promoted_size;
size_t collection_count;
};
// !!!!!!!!!!!!!!!!!!!!!!!
// make sure you change the def in bcl\system\gc.cs
// if you change this!
enum collection_mode
{
collection_non_blocking = 0x00000001,
collection_blocking = 0x00000002,
collection_optimized = 0x00000004,
collection_compacting = 0x00000008
#ifdef STRESS_HEAP
, collection_gcstress = 0x80000000
#endif // STRESS_HEAP
};
// !!!!!!!!!!!!!!!!!!!!!!!
// make sure you change the def in bcl\system\gc.cs
// if you change this!
enum wait_full_gc_status
{
wait_full_gc_success = 0,
wait_full_gc_failed = 1,
wait_full_gc_cancelled = 2,
wait_full_gc_timeout = 3,
wait_full_gc_na = 4
};
// !!!!!!!!!!!!!!!!!!!!!!!
// make sure you change the def in bcl\system\gc.cs
// if you change this!
enum start_no_gc_region_status
{
start_no_gc_success = 0,
start_no_gc_no_memory = 1,
start_no_gc_too_large = 2,
start_no_gc_in_progress = 3
};
enum end_no_gc_region_status
{
end_no_gc_success = 0,
end_no_gc_not_in_progress = 1,
end_no_gc_induced = 2,
end_no_gc_alloc_exceeded = 3
};
enum bgc_state
{
bgc_not_in_process = 0,
bgc_initialized,
bgc_reset_ww,
bgc_mark_handles,
bgc_mark_stack,
bgc_revisit_soh,
bgc_revisit_loh,
bgc_overflow_soh,
bgc_overflow_loh,
bgc_final_marking,
bgc_sweep_soh,
bgc_sweep_loh,
bgc_plan_phase
};
enum changed_seg_state
{
seg_deleted,
seg_added
};
void record_changed_seg (BYTE* start, BYTE* end,
size_t current_gc_index,
bgc_state current_bgc_state,
changed_seg_state changed_state);
//constants for the flags parameter to the gc call back
#define GC_CALL_INTERIOR 0x1
#define GC_CALL_PINNED 0x2
#define GC_CALL_CHECK_APP_DOMAIN 0x4
//flags for GCHeap::Alloc(...)
#define GC_ALLOC_FINALIZE 0x1
#define GC_ALLOC_CONTAINS_REF 0x2
#define GC_ALLOC_ALIGN8_BIAS 0x4
class GCHeap {
friend struct ::_DacGlobals;
#ifdef DACCESS_COMPILE
friend class ClrDataAccess;
#endif
public:
virtual ~GCHeap() {}
static GCHeap *GetGCHeap()
{
#ifdef CLR_STANDALONE_BINDER
return NULL;
#else
LIMITED_METHOD_CONTRACT;
_ASSERTE(g_pGCHeap != NULL);
return g_pGCHeap;
#endif
}
#ifndef CLR_STANDALONE_BINDER
static BOOL IsGCHeapInitialized()
{
LIMITED_METHOD_CONTRACT;
return (g_pGCHeap != NULL);
}
static BOOL IsGCInProgress(BOOL bConsiderGCStart = FALSE)
{
WRAPPER_NO_CONTRACT;
return (IsGCHeapInitialized() ? GetGCHeap()->IsGCInProgressHelper(bConsiderGCStart) : false);
}
static void WaitForGCCompletion(BOOL bConsiderGCStart = FALSE)
{
WRAPPER_NO_CONTRACT;
if (IsGCHeapInitialized())
GetGCHeap()->WaitUntilGCComplete(bConsiderGCStart);
}
// The runtime needs to know whether we're using workstation or server GC
// long before the GCHeap is created. So IsServerHeap cannot be a virtual
// method on GCHeap. Instead we make it a static method and initialize
// gcHeapType before any of the calls to IsServerHeap. Note that this also
// has the advantage of getting the answer without an indirection
// (virtual call), which is important for perf critical codepaths.
#ifndef DACCESS_COMPILE
static void InitializeHeapType(bool bServerHeap)
{
LIMITED_METHOD_CONTRACT;
#ifdef FEATURE_SVR_GC
gcHeapType = bServerHeap ? GC_HEAP_SVR : GC_HEAP_WKS;
#ifdef WRITE_BARRIER_CHECK
if (gcHeapType == GC_HEAP_SVR)
{
g_GCShadow = 0;
g_GCShadowEnd = 0;
}
#endif
#else // FEATURE_SVR_GC
CONSISTENCY_CHECK(bServerHeap == false);
#endif // FEATURE_SVR_GC
}
#endif
static BOOL IsValidSegmentSize(size_t cbSize)
{
//Must be aligned on a Mb and greater than 4Mb
return (((cbSize & (1024*1024-1)) ==0) && (cbSize >> 22));
}
static BOOL IsValidGen0MaxSize(size_t cbSize)
{
return (cbSize >= 64*1024);
}
inline static bool IsServerHeap()
{
LIMITED_METHOD_CONTRACT;
#ifdef FEATURE_SVR_GC
_ASSERTE(gcHeapType != GC_HEAP_INVALID);
return (gcHeapType == GC_HEAP_SVR);
#else // FEATURE_SVR_GC
return false;
#endif // FEATURE_SVR_GC
}
inline static bool UseAllocationContexts()
{
WRAPPER_NO_CONTRACT;
#ifdef FEATURE_REDHAWK
// SIMPLIFY: only use allocation contexts
return true;
#else
#if defined(_TARGET_ARM_) || defined(FEATURE_PAL)
return true;
#else
return ((IsServerHeap() ? true : (g_SystemInfo.dwNumberOfProcessors >= 2)));
#endif
#endif
}
inline static bool MarkShouldCompeteForStatics()
{
WRAPPER_NO_CONTRACT;
return IsServerHeap() && g_SystemInfo.dwNumberOfProcessors >= 2;
}
#ifndef DACCESS_COMPILE
static GCHeap * CreateGCHeap()
{
WRAPPER_NO_CONTRACT;
GCHeap * pGCHeap;
#if defined(FEATURE_SVR_GC)
pGCHeap = (IsServerHeap() ? SVR::CreateGCHeap() : WKS::CreateGCHeap());
#else
pGCHeap = WKS::CreateGCHeap();
#endif // defined(FEATURE_SVR_GC)
g_pGCHeap = pGCHeap;
return pGCHeap;
}
#endif // DACCESS_COMPILE
#endif // !CLR_STANDALONE_BINDER
private:
typedef enum
{
GC_HEAP_INVALID = 0,
GC_HEAP_WKS = 1,
GC_HEAP_SVR = 2
} GC_HEAP_TYPE;
#ifdef FEATURE_SVR_GC
SVAL_DECL(DWORD,gcHeapType);
#endif // FEATURE_SVR_GC
public:
// TODO Synchronization, should be moved out
virtual BOOL IsGCInProgressHelper (BOOL bConsiderGCStart = FALSE) = 0;
virtual DWORD WaitUntilGCComplete (BOOL bConsiderGCStart = FALSE) = 0;
virtual void SetGCInProgress(BOOL fInProgress) = 0;
virtual CLREventStatic * GetWaitForGCEvent() = 0;
virtual void SetFinalizationRun (Object* obj) = 0;
virtual Object* GetNextFinalizable() = 0;
virtual size_t GetNumberOfFinalizable() = 0;
virtual void SetFinalizeQueueForShutdown(BOOL fHasLock) = 0;
virtual BOOL FinalizeAppDomain(AppDomain *pDomain, BOOL fRunFinalizers) = 0;
virtual BOOL ShouldRestartFinalizerWatchDog() = 0;
//wait for concurrent GC to finish
virtual void WaitUntilConcurrentGCComplete () = 0; // Use in managed threads
#ifndef DACCESS_COMPILE
virtual HRESULT WaitUntilConcurrentGCCompleteAsync(int millisecondsTimeout) = 0; // Use in native threads. TRUE if succeed. FALSE if failed or timeout
#endif
virtual BOOL IsConcurrentGCInProgress() = 0;
// Enable/disable concurrent GC
virtual void TemporaryEnableConcurrentGC() = 0;
virtual void TemporaryDisableConcurrentGC() = 0;
virtual BOOL IsConcurrentGCEnabled() = 0;
virtual void FixAllocContext (alloc_context* acontext, BOOL lockp, void* arg, void *heap) = 0;
virtual Object* Alloc (alloc_context* acontext, size_t size, DWORD flags) = 0;
// This is safe to call only when EE is suspended.
virtual Object* GetContainingObject(void *pInteriorPtr) = 0;
// TODO Should be folded into constructor
virtual HRESULT Initialize () = 0;
virtual HRESULT GarbageCollect (int generation = -1, BOOL low_memory_p=FALSE, int mode = collection_blocking) = 0;
virtual Object* Alloc (size_t size, DWORD flags) = 0;
#ifdef FEATURE_64BIT_ALIGNMENT
virtual Object* AllocAlign8 (size_t size, DWORD flags) = 0;
virtual Object* AllocAlign8 (alloc_context* acontext, size_t size, DWORD flags) = 0;
private:
virtual Object* AllocAlign8Common (void* hp, alloc_context* acontext, size_t size, DWORD flags) = 0;
public:
#endif // FEATURE_64BIT_ALIGNMENT
virtual Object* AllocLHeap (size_t size, DWORD flags) = 0;
virtual void SetReservedVMLimit (size_t vmlimit) = 0;
virtual void SetCardsAfterBulkCopy( Object**, size_t ) = 0;
#if defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
virtual void WalkObject (Object* obj, walk_fn fn, void* context) = 0;
#endif //defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
virtual bool IsThreadUsingAllocationContextHeap(alloc_context* acontext, int thread_number) = 0;
virtual int GetNumberOfHeaps () = 0;
virtual int GetHomeHeapNumber () = 0;
virtual int CollectionCount (int generation, int get_bgc_fgc_count = 0) = 0;
// Finalizer queue stuff (should stay)
virtual bool RegisterForFinalization (int gen, Object* obj) = 0;
// General queries to the GC
virtual BOOL IsPromoted (Object *object) = 0;
virtual unsigned WhichGeneration (Object* object) = 0;
virtual BOOL IsEphemeral (Object* object) = 0;
virtual BOOL IsHeapPointer (void* object, BOOL small_heap_only = FALSE) = 0;
virtual unsigned GetCondemnedGeneration() = 0;
virtual int GetGcLatencyMode() = 0;
virtual int SetGcLatencyMode(int newLatencyMode) = 0;
virtual int GetLOHCompactionMode() = 0;
virtual void SetLOHCompactionMode(int newLOHCompactionyMode) = 0;
virtual BOOL RegisterForFullGCNotification(DWORD gen2Percentage,
DWORD lohPercentage) = 0;
virtual BOOL CancelFullGCNotification() = 0;
virtual int WaitForFullGCApproach(int millisecondsTimeout) = 0;
virtual int WaitForFullGCComplete(int millisecondsTimeout) = 0;
virtual int StartNoGCRegion(ULONGLONG totalSize, BOOL lohSizeKnown, ULONGLONG lohSize, BOOL disallowFullBlockingGC) = 0;
virtual int EndNoGCRegion() = 0;
virtual BOOL IsObjectInFixedHeap(Object *pObj) = 0;
virtual size_t GetTotalBytesInUse () = 0;
virtual size_t GetCurrentObjSize() = 0;
virtual size_t GetLastGCStartTime(int generation) = 0;
virtual size_t GetLastGCDuration(int generation) = 0;
virtual size_t GetNow() = 0;
virtual unsigned GetGcCount() = 0;
virtual void TraceGCSegments() = 0;
virtual void PublishObject(BYTE* obj) = 0;
// static if since restricting for all heaps is fine
virtual size_t GetValidSegmentSize(BOOL large_seg = FALSE) = 0;
static unsigned GetMaxGeneration() {
LIMITED_METHOD_DAC_CONTRACT;
return max_generation;
}
virtual size_t GetPromotedBytes(int heap_index) = 0;
private:
enum {
max_generation = 2,
};
public:
#ifdef FEATURE_BASICFREEZE
// frozen segment management functions
virtual segment_handle RegisterFrozenSegment(segment_info *pseginfo) = 0;
virtual void UnregisterFrozenSegment(segment_handle seg) = 0;
#endif //FEATURE_BASICFREEZE
// debug support
#ifndef FEATURE_REDHAWK // Redhawk forces relocation a different way
#ifdef STRESS_HEAP
//return TRUE if GC actually happens, otherwise FALSE
virtual BOOL StressHeap(alloc_context * acontext = 0) = 0;
#endif
#endif // FEATURE_REDHAWK
#ifdef VERIFY_HEAP
virtual void ValidateObjectMember (Object *obj) = 0;
#endif
#if defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
virtual void DescrGenerationsToProfiler (gen_walk_fn fn, void *context) = 0;
#endif // defined(GC_PROFILING) || defined(FEATURE_EVENT_TRACE)
protected:
#ifdef VERIFY_HEAP
public:
// Return NULL if can't find next object. When EE is not suspended,
// the result is not accurate: if the input arg is in gen0, the function could
// return zeroed out memory as next object
virtual Object * NextObj (Object * object) = 0;
#ifdef FEATURE_BASICFREEZE
// Return TRUE if object lives in frozen segment
virtual BOOL IsInFrozenSegment (Object * object) = 0;
#endif //FEATURE_BASICFREEZE
#endif //VERIFY_HEAP
};
extern VOLATILE(LONG) m_GCLock;
// Go through and touch (read) each page straddled by a memory block.
void TouchPages(LPVOID pStart, UINT cb);
// For low memory notification from host
extern LONG g_bLowMemoryFromHost;
#ifdef WRITE_BARRIER_CHECK
void updateGCShadow(Object** ptr, Object* val);
#endif
// the method table for the WeakReference class
extern MethodTable *pWeakReferenceMT;
// The canonical method table for WeakReference<T>
extern MethodTable *pWeakReferenceOfTCanonMT;
extern void FinalizeWeakReference(Object * obj);
#endif // __GC_H
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