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zMarkStack.hpp
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zMarkStack.hpp
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/*
* Copyright (c) 2016, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#ifndef SHARE_GC_Z_ZMARKSTACK_HPP
#define SHARE_GC_Z_ZMARKSTACK_HPP
#include "gc/z/zGlobals.hpp"
#include "gc/z/zMarkStackEntry.hpp"
#include "utilities/globalDefinitions.hpp"
class ZMarkTerminate;
template <typename T, size_t S>
class ZStack {
private:
size_t _top;
ZStack<T, S>* _next;
T _slots[S];
bool is_full() const;
public:
ZStack();
bool is_empty() const;
bool push(T value);
bool pop(T& value);
ZStack<T, S>* next() const;
ZStack<T, S>** next_addr();
};
template <typename T>
class ZCACHE_ALIGNED ZStackList {
private:
uintptr_t _base;
T* volatile _head;
T* encode_versioned_pointer(const T* stack, uint32_t version) const;
void decode_versioned_pointer(const T* vstack, T** stack, uint32_t* version) const;
public:
explicit ZStackList(uintptr_t base);
bool is_empty() const;
void push(T* stack);
T* pop();
void clear();
};
using ZMarkStack = ZStack<ZMarkStackEntry, ZMarkStackSlots>;
using ZMarkStackList = ZStackList<ZMarkStack>;
using ZMarkStackMagazine = ZStack<ZMarkStack*, ZMarkStackMagazineSlots>;
using ZMarkStackMagazineList = ZStackList<ZMarkStackMagazine>;
static_assert(sizeof(ZMarkStack) == ZMarkStackSize, "ZMarkStack size mismatch");
static_assert(sizeof(ZMarkStackMagazine) <= ZMarkStackSize, "ZMarkStackMagazine size too large");
class ZMarkStripe {
private:
ZCACHE_ALIGNED ZMarkStackList _published;
ZCACHE_ALIGNED ZMarkStackList _overflowed;
public:
explicit ZMarkStripe(uintptr_t base = 0);
bool is_empty() const;
void publish_stack(ZMarkStack* stack, ZMarkTerminate* terminate, bool publish);
ZMarkStack* steal_stack();
};
class ZMarkStripeSet {
private:
size_t _nstripes_mask;
ZMarkStripe _stripes[ZMarkStripesMax];
public:
explicit ZMarkStripeSet(uintptr_t base);
void set_nstripes(size_t nstripes);
size_t nstripes() const;
bool is_empty() const;
size_t stripe_id(const ZMarkStripe* stripe) const;
ZMarkStripe* stripe_at(size_t index);
ZMarkStripe* stripe_next(ZMarkStripe* stripe);
ZMarkStripe* stripe_for_worker(uint nworkers, uint worker_id);
ZMarkStripe* stripe_for_addr(uintptr_t addr);
};
class ZMarkStackAllocator;
class ZMarkThreadLocalStacks {
private:
ZMarkStackMagazine* _magazine;
ZMarkStack* _stacks[ZMarkStripesMax];
ZMarkStack* allocate_stack(ZMarkStackAllocator* allocator);
void free_stack(ZMarkStackAllocator* allocator, ZMarkStack* stack);
bool push_slow(ZMarkStackAllocator* allocator,
ZMarkStripe* stripe,
ZMarkStack** stackp,
ZMarkTerminate* terminate,
ZMarkStackEntry entry,
bool publish);
bool pop_slow(ZMarkStackAllocator* allocator,
ZMarkStripe* stripe,
ZMarkStack** stackp,
ZMarkStackEntry& entry);
public:
ZMarkThreadLocalStacks();
bool is_empty(const ZMarkStripeSet* stripes) const;
void install(ZMarkStripeSet* stripes,
ZMarkStripe* stripe,
ZMarkStack* stack);
ZMarkStack* steal(ZMarkStripeSet* stripes,
ZMarkStripe* stripe);
bool push(ZMarkStackAllocator* allocator,
ZMarkStripeSet* stripes,
ZMarkStripe* stripe,
ZMarkTerminate* terminate,
ZMarkStackEntry entry,
bool publish);
bool pop(ZMarkStackAllocator* allocator,
ZMarkStripeSet* stripes,
ZMarkStripe* stripe,
ZMarkStackEntry& entry);
bool flush(ZMarkStackAllocator* allocator,
ZMarkStripeSet* stripes,
ZMarkTerminate* terminate);
void free(ZMarkStackAllocator* allocator);
};
#endif // SHARE_GC_Z_ZMARKSTACK_HPP