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HeapVirtualMemory.hpp
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HeapVirtualMemory.hpp
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/*******************************************************************************
* Copyright (c) 1991, 2020 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#if !defined(HEAPVIRTUALMEMORY_HPP_)
#define HEAPVIRTUALMEMORY_HPP_
#include "omrcomp.h"
#include "Heap.hpp"
#include "MemoryHandle.hpp"
class MM_EnvironmentBase;
class MM_HeapRegionManager;
class MM_MemorySubSpace;
class MM_PhysicalArena;
class MM_HeapVirtualMemory : public MM_Heap {
protected:
MM_MemoryHandle _vmemHandle;
uintptr_t _heapAlignment;
MM_PhysicalArena* _physicalArena;
private:
protected:
bool initialize(MM_EnvironmentBase* env, uintptr_t size);
void tearDown(MM_EnvironmentBase* env);
public:
static MM_HeapVirtualMemory* newInstance(MM_EnvironmentBase* env, uintptr_t heapAlignment, uintptr_t size, MM_HeapRegionManager* regionManager);
virtual void kill(MM_EnvironmentBase* env);
/**< returning pointer to our vmem handle (have to specify a pointer to const, to ensure caller will not modify it) */
const MM_MemoryHandle *getVmemHandle() { return &_vmemHandle; }
virtual uintptr_t getPageSize();
virtual uintptr_t getPageFlags();
virtual void* getHeapBase();
virtual void* getHeapTop();
#if defined(OMR_GC_DOUBLE_MAP_ARRAYLETS)
virtual void *doubleMapArraylet(MM_EnvironmentBase *env, void* arrayletLeaves[], UDATA arrayletLeafCount, UDATA arrayletLeafSize, UDATA byteAmount, struct J9PortVmemIdentifier *newIdentifier, UDATA pageSize);
virtual void *doubleMapRegions(MM_EnvironmentBase *env, void* regions[], UDATA regionsCount, UDATA regionSize, UDATA byteAmount, struct J9PortVmemIdentifier *newIdentifier, UDATA pageSize, void *preferredAddress);
#endif /* defined(OMR_GC_DOUBLE_MAP_ARRAYLETS) */
virtual uintptr_t getMaximumPhysicalRange();
virtual bool attachArena(MM_EnvironmentBase* env, MM_PhysicalArena* arena, uintptr_t size);
virtual void detachArena(MM_EnvironmentBase* env, MM_PhysicalArena* arena);
virtual bool commitMemory(void* address, uintptr_t size);
virtual bool decommitMemory(void* address, uintptr_t size, void* lowValidAddress, void* highValidAddress);
virtual uintptr_t calculateOffsetFromHeapBase(void* address);
virtual bool heapAddRange(MM_EnvironmentBase* env, MM_MemorySubSpace* subspace, uintptr_t size, void* lowAddress, void* highAddress);
virtual bool heapRemoveRange(MM_EnvironmentBase* env, MM_MemorySubSpace* subspace, uintptr_t size, void* lowAddress, void* highAddress, void* lowValidAddress, void* highValidAddress);
virtual bool initializeHeapRegionManager(MM_EnvironmentBase* env, MM_HeapRegionManager* manager);
/**
* Create a Heap object.
*/
MM_HeapVirtualMemory(MM_EnvironmentBase* env, uintptr_t heapAlignment, uintptr_t maximumMemorySize, MM_HeapRegionManager* regionManager)
: MM_Heap(env, maximumMemorySize, regionManager)
, _vmemHandle()
, _heapAlignment(heapAlignment)
, _physicalArena(NULL)
{
_typeId = __FUNCTION__;
}
/* Split heap needs access to the _vmem instance for region manager initialization */
friend class MM_HeapSplit;
};
#endif /* HEAPVIRTUALMEMORY_HPP_ */