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/*
* Heap.h
*
* Created on: 5 Mar 2021
* Author: David
*/
#ifndef SRC_PLATFORM_HEAP_H_
#define SRC_PLATFORM_HEAP_H_
#include <RepRapFirmware.h>
#include <RTOSIface/RTOSIface.h> // for class ReadLockedPointer
#include <atomic>
class IndexSlot;
class StorageSpace;
class HeapBlock;
class IndexBlock;
// Note: StringHandle is a union member in ExpressionValue, therefore it cannot have a non-trivial destructor, copy constructor etc.
// This means that when an object containing a StringHandle is copied or destroyed, that object must handle the reference count.
// Classes other than ExpressionValue should use AutoStringHandle instead;
class StringHandle
{
public:
StringHandle() noexcept { slotPtr = nullptr; }
StringHandle(const char *s) noexcept;
StringHandle(const char *s, size_t len) noexcept;
#if 0 // unused
StringHandle(const char *s1, const char *s2) noexcept;
#endif
ReadLockedPointer<const char> Get() const noexcept;
size_t GetLength() const noexcept;
void Delete() noexcept;
const StringHandle& IncreaseRefCount() const noexcept;
bool IsNull() const noexcept { return slotPtr == nullptr; }
void Assign(const char *s) noexcept;
static void GarbageCollect() noexcept;
// static size_t GetWastedSpace() noexcept { return spaceToRecycle; }
// static size_t GetIndexSpace() noexcept { return totalIndexSpace; }
// static size_t GetHeapSpace() noexcept { return totalHeapSpace; }
static bool CheckIntegrity(const StringRef& errmsg) noexcept;
static void Diagnostics(MessageType mt) noexcept;
protected:
void InternalAssign(const char *s, size_t len) noexcept;
void InternalDelete() noexcept;
static IndexSlot *AllocateHandle() noexcept;
static StorageSpace *AllocateSpace(size_t length) noexcept;
static void GarbageCollectInternal() noexcept;
static void AdjustHandles(char *startAddr, char *endAddr, size_t moveDown, unsigned int numHandles) noexcept;
IndexSlot *slotPtr;
static ReadWriteLock heapLock;
static IndexBlock *indexRoot;
static HeapBlock *heapRoot;
static size_t handlesAllocated;
static std::atomic<size_t> handlesUsed;
static size_t heapAllocated;
static size_t heapUsed;
static std::atomic<size_t> heapToRecycle;
static unsigned int gcCyclesDone;
};
// Version of StringHandle that updates the reference counts automatically
class AutoStringHandle : public StringHandle
{
public:
AutoStringHandle() noexcept : StringHandle() { }
AutoStringHandle(const char *s) noexcept : StringHandle(s) { }
AutoStringHandle(const char *s, size_t len) noexcept : StringHandle(s, len) { }
AutoStringHandle(const AutoStringHandle& other) noexcept;
AutoStringHandle(AutoStringHandle&& other) noexcept;
AutoStringHandle& operator=(const AutoStringHandle& other) noexcept;
~AutoStringHandle();
};
#endif /* SRC_PLATFORM_HEAP_H_ */
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