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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.
/*
* GCCOMMON.CPP
*
* Code common to both SVR and WKS gcs
*/
#include "common.h"
#include "gcenv.h"
#include "gc.h"
IGCHeapInternal* g_theGCHeap;
IGCHandleTable* g_theGCHandleTable;
#ifdef FEATURE_STANDALONE_GC
IGCToCLR* g_theGCToCLR;
#endif // FEATURE_STANDALONE_GC
#ifdef GC_CONFIG_DRIVEN
size_t gc_global_mechanisms[MAX_GLOBAL_GC_MECHANISMS_COUNT];
#endif //GC_CONFIG_DRIVEN
#ifndef DACCESS_COMPILE
#ifdef WRITE_BARRIER_CHECK
uint8_t* g_GCShadow;
uint8_t* g_GCShadowEnd;
uint8_t* g_shadow_lowest_address = NULL;
#endif
uint32_t* g_gc_card_table;
#ifdef FEATURE_MANUALLY_MANAGED_CARD_BUNDLES
uint32_t* g_gc_card_bundle_table;
#endif
uint8_t* g_gc_lowest_address = 0;
uint8_t* g_gc_highest_address = 0;
GCHeapType g_gc_heap_type = GC_HEAP_INVALID;
uint32_t g_max_generation = max_generation;
MethodTable* g_gc_pFreeObjectMethodTable = nullptr;
#ifdef GC_CONFIG_DRIVEN
void record_global_mechanism (int mech_index)
{
(gc_global_mechanisms[mech_index])++;
}
#endif //GC_CONFIG_DRIVEN
int32_t g_bLowMemoryFromHost = 0;
#ifdef WRITE_BARRIER_CHECK
#define INVALIDGCVALUE (void *)((size_t)0xcccccccd)
// called by the write barrier to update the shadow heap
void updateGCShadow(Object** ptr, Object* val)
{
Object** shadow = (Object**) &g_GCShadow[((uint8_t*) ptr - g_lowest_address)];
if ((uint8_t*) shadow < g_GCShadowEnd)
{
*shadow = val;
// Ensure that the write to the shadow heap occurs before the read from
// the GC heap so that race conditions are caught by INVALIDGCVALUE.
MemoryBarrier();
if(*ptr!=val)
*shadow = (Object *) INVALIDGCVALUE;
}
}
#endif // WRITE_BARRIER_CHECK
struct changed_seg
{
uint8_t * start;
uint8_t * end;
size_t gc_index;
bgc_state bgc;
changed_seg_state changed;
};
const int max_saved_changed_segs = 128;
changed_seg saved_changed_segs[max_saved_changed_segs];
int saved_changed_segs_count = 0;
void record_changed_seg (uint8_t* start, uint8_t* end,
size_t current_gc_index,
bgc_state current_bgc_state,
changed_seg_state changed_state)
{
if (saved_changed_segs_count < max_saved_changed_segs)
{
saved_changed_segs[saved_changed_segs_count].start = start;
saved_changed_segs[saved_changed_segs_count].end = end;
saved_changed_segs[saved_changed_segs_count].gc_index = current_gc_index;
saved_changed_segs[saved_changed_segs_count].bgc = current_bgc_state;
saved_changed_segs[saved_changed_segs_count].changed = changed_state;
saved_changed_segs_count++;
}
else
{
saved_changed_segs_count = 0;
}
}
// The runtime needs to know whether we're using workstation or server GC
// long before the GCHeap is created.
void InitializeHeapType(bool bServerHeap)
{
LIMITED_METHOD_CONTRACT;
#ifdef FEATURE_SVR_GC
g_gc_heap_type = bServerHeap ? GC_HEAP_SVR : GC_HEAP_WKS;
#ifdef WRITE_BARRIER_CHECK
if (g_gc_heap_type == GC_HEAP_SVR)
{
g_GCShadow = 0;
g_GCShadowEnd = 0;
}
#endif // WRITE_BARRIER_CHECK
#else // FEATURE_SVR_GC
UNREFERENCED_PARAMETER(bServerHeap);
CONSISTENCY_CHECK(bServerHeap == false);
#endif // FEATURE_SVR_GC
}
namespace WKS
{
extern void PopulateDacVars(GcDacVars* dacVars);
}
namespace SVR
{
extern void PopulateDacVars(GcDacVars* dacVars);
}
bool InitializeGarbageCollector(IGCToCLR* clrToGC, IGCHeap** gcHeap, IGCHandleTable** gcHandleTable, GcDacVars* gcDacVars)
{
LIMITED_METHOD_CONTRACT;
IGCHeapInternal* heap;
assert(gcDacVars != nullptr);
assert(gcHeap != nullptr);
assert(gcHandleTable != nullptr);
IGCHandleTable* handleTable = CreateGCHandleTable();
if (handleTable == nullptr)
{
return false;
}
#ifdef FEATURE_SVR_GC
assert(g_gc_heap_type != GC_HEAP_INVALID);
if (g_gc_heap_type == GC_HEAP_SVR)
{
heap = SVR::CreateGCHeap();
SVR::PopulateDacVars(gcDacVars);
}
else
{
heap = WKS::CreateGCHeap();
WKS::PopulateDacVars(gcDacVars);
}
#else
heap = WKS::CreateGCHeap();
WKS::PopulateDacVars(gcDacVars);
#endif
if (heap == nullptr)
{
return false;
}
g_theGCHeap = heap;
#ifdef FEATURE_STANDALONE_GC
assert(clrToGC != nullptr);
g_theGCToCLR = clrToGC;
#else
UNREFERENCED_PARAMETER(clrToGC);
assert(clrToGC == nullptr);
#endif
*gcHandleTable = handleTable;
*gcHeap = heap;
return true;
}
#endif // !DACCESS_COMPILE
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