mirror of
https://github.com/autc04/Retro68.git
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340 lines
9.8 KiB
C++
340 lines
9.8 KiB
C++
/* Copyright (C) 2008-2019 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libitm_i.h"
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// Avoid a dependency on libstdc++ for the pure virtuals in abi_dispatch.
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extern "C" void HIDDEN
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__cxa_pure_virtual ()
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{
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abort ();
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}
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using namespace GTM;
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namespace {
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// This group consists of the serial, serialirr, and serialirr_onwrite
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// methods, which all need no global state (except what is already provided
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// by the serial mode implementation).
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struct serial_mg : public method_group
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{
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virtual void init() { }
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virtual void fini() { }
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};
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static serial_mg o_serial_mg;
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class serialirr_dispatch : public abi_dispatch
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{
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public:
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serialirr_dispatch() : abi_dispatch(false, true, true, false,
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gtm_thread::STATE_SERIAL | gtm_thread::STATE_IRREVOCABLE, &o_serial_mg)
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{ }
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protected:
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serialirr_dispatch(bool ro, bool wt, bool uninstrumented,
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bool closed_nesting, uint32_t requires_serial, method_group* mg) :
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abi_dispatch(ro, wt, uninstrumented, closed_nesting, requires_serial, mg)
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{ }
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// Transactional loads and stores simply access memory directly.
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// These methods are static to avoid indirect calls, and will be used by the
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// virtual ABI dispatch methods or by static direct-access methods created
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// below.
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template <typename V> static V load(const V* addr, ls_modifier mod)
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{
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return *addr;
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}
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template <typename V> static void store(V* addr, const V value,
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ls_modifier mod)
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{
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*addr = value;
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}
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public:
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static void memtransfer_static(void *dst, const void* src, size_t size,
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bool may_overlap, ls_modifier dst_mod, ls_modifier src_mod)
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{
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if (!may_overlap)
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::memcpy(dst, src, size);
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else
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::memmove(dst, src, size);
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}
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static void memset_static(void *dst, int c, size_t size, ls_modifier mod)
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{
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::memset(dst, c, size);
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}
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CREATE_DISPATCH_METHODS(virtual, )
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CREATE_DISPATCH_METHODS_MEM()
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virtual gtm_restart_reason begin_or_restart() { return NO_RESTART; }
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virtual bool trycommit(gtm_word& priv_time) { return true; }
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virtual void rollback(gtm_transaction_cp *cp) { abort(); }
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virtual bool snapshot_most_recent() { return true; }
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virtual abi_dispatch* closed_nesting_alternative()
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{
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// For nested transactions with an instrumented code path, we can do
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// undo logging.
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return GTM::dispatch_serial();
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}
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};
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class serial_dispatch : public abi_dispatch
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{
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protected:
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static void log(const void *addr, size_t len)
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{
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gtm_thread *tx = gtm_thr();
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tx->undolog.log(addr, len);
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}
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template <typename V> static V load(const V* addr, ls_modifier mod)
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{
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return *addr;
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}
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template <typename V> static void store(V* addr, const V value,
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ls_modifier mod)
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{
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if (mod != WaW)
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log(addr, sizeof(V));
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*addr = value;
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}
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public:
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static void memtransfer_static(void *dst, const void* src, size_t size,
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bool may_overlap, ls_modifier dst_mod, ls_modifier src_mod)
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{
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if (dst_mod != WaW && dst_mod != NONTXNAL)
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log(dst, size);
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if (!may_overlap)
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::memcpy(dst, src, size);
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else
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::memmove(dst, src, size);
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}
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static void memset_static(void *dst, int c, size_t size, ls_modifier mod)
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{
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if (mod != WaW)
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log(dst, size);
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::memset(dst, c, size);
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}
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virtual gtm_restart_reason begin_or_restart() { return NO_RESTART; }
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virtual bool trycommit(gtm_word& priv_time) { return true; }
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// Local undo will handle this.
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// trydropreference() need not be changed either.
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virtual void rollback(gtm_transaction_cp *cp) { }
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virtual bool snapshot_most_recent() { return true; }
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CREATE_DISPATCH_METHODS(virtual, )
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CREATE_DISPATCH_METHODS_MEM()
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serial_dispatch() : abi_dispatch(false, true, false, true,
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gtm_thread::STATE_SERIAL, &o_serial_mg)
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{ }
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};
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// Like serialirr_dispatch but does not requests serial-irrevocable mode until
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// the first write in the transaction. Can be useful for read-mostly workloads
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// and testing, but is likely too simple to be of general purpose.
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class serialirr_onwrite_dispatch : public serialirr_dispatch
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{
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public:
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serialirr_onwrite_dispatch() :
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serialirr_dispatch(false, true, false, false, 0, &o_serial_mg) { }
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protected:
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static void pre_write()
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{
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gtm_thread *tx = gtm_thr();
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if (!(tx->state & (gtm_thread::STATE_SERIAL
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| gtm_thread::STATE_IRREVOCABLE)))
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tx->serialirr_mode();
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}
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// Transactional loads access memory directly.
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// Transactional stores switch to serial mode first.
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template <typename V> static void store(V* addr, const V value,
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ls_modifier mod)
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{
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pre_write();
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serialirr_dispatch::store(addr, value, mod);
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}
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public:
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static void memtransfer_static(void *dst, const void* src, size_t size,
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bool may_overlap, ls_modifier dst_mod, ls_modifier src_mod)
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{
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pre_write();
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serialirr_dispatch::memtransfer_static(dst, src, size, may_overlap,
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dst_mod, src_mod);
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}
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static void memset_static(void *dst, int c, size_t size, ls_modifier mod)
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{
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pre_write();
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serialirr_dispatch::memset_static(dst, c, size, mod);
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}
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CREATE_DISPATCH_METHODS(virtual, )
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CREATE_DISPATCH_METHODS_MEM()
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virtual void rollback(gtm_transaction_cp *cp)
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{
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gtm_thread *tx = gtm_thr();
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if (tx->state & gtm_thread::STATE_IRREVOCABLE)
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abort();
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}
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virtual bool snapshot_most_recent() { return true; }
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};
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// This group is pure HTM with serial mode as a fallback. There is no
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// difference to serial_mg except that we need to enable or disable the HTM
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// fastpath. See gtm_thread::begin_transaction.
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struct htm_mg : public method_group
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{
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virtual void init()
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{
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// Enable the HTM fastpath if the HW is available. The fastpath is
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// initially disabled.
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#ifdef USE_HTM_FASTPATH
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gtm_thread::serial_lock.set_htm_fastpath(htm_init());
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#endif
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}
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virtual void fini()
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{
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// Disable the HTM fastpath.
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gtm_thread::serial_lock.set_htm_fastpath(0);
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}
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};
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static htm_mg o_htm_mg;
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// We just need the subclass to associate it with the HTM method group that
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// sets up the HTM fast path. This will use serial_dispatch as fallback for
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// transactions that might get canceled; it has a different method group, but
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// this is harmless for serial dispatchs because they never abort.
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class htm_dispatch : public serialirr_dispatch
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{
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public:
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htm_dispatch() : serialirr_dispatch(false, true, false, false,
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gtm_thread::STATE_SERIAL | gtm_thread::STATE_IRREVOCABLE, &o_htm_mg)
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{ }
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};
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} // anon namespace
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static const serialirr_dispatch o_serialirr_dispatch;
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static const serial_dispatch o_serial_dispatch;
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static const serialirr_onwrite_dispatch o_serialirr_onwrite_dispatch;
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static const htm_dispatch o_htm_dispatch;
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abi_dispatch *
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GTM::dispatch_serialirr ()
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{
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return const_cast<serialirr_dispatch *>(&o_serialirr_dispatch);
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}
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abi_dispatch *
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GTM::dispatch_serial ()
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{
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return const_cast<serial_dispatch *>(&o_serial_dispatch);
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}
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abi_dispatch *
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GTM::dispatch_serialirr_onwrite ()
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{
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return
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const_cast<serialirr_onwrite_dispatch *>(&o_serialirr_onwrite_dispatch);
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}
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abi_dispatch *
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GTM::dispatch_htm ()
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{
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return const_cast<htm_dispatch *>(&o_htm_dispatch);
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}
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// Put the transaction into serial-irrevocable mode.
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void
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GTM::gtm_thread::serialirr_mode ()
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{
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struct abi_dispatch *disp = abi_disp ();
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#if defined(USE_HTM_FASTPATH)
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// HTM fastpath. If we are executing a HW transaction, don't go serial but
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// continue. See gtm_thread::begin_transaction.
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if (likely(!gtm_thread::serial_lock.htm_fastpath_disabled()))
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return;
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#endif
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if (this->state & STATE_SERIAL)
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{
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if (this->state & STATE_IRREVOCABLE)
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return;
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// Try to commit the dispatch-specific part of the transaction, as we
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// would do for an outermost commit.
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// We're already serial, so we don't need to ensure privatization safety
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// for other transactions here.
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gtm_word priv_time = 0;
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bool ok __attribute__((unused)) = disp->trycommit (priv_time);
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// Given that we're already serial, the trycommit better work.
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assert (ok);
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}
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else if (serial_lock.write_upgrade (this))
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{
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this->state |= STATE_SERIAL;
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// Try to commit the dispatch-specific part of the transaction, as we
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// would do for an outermost commit.
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// We have successfully upgraded to serial mode, so we don't need to
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// ensure privatization safety for other transactions here.
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// However, we are still a reader (wrt. privatization safety) until we
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// have either committed or restarted, so finish the upgrade after that.
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gtm_word priv_time = 0;
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if (!disp->trycommit (priv_time))
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restart (RESTART_SERIAL_IRR, true);
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gtm_thread::serial_lock.write_upgrade_finish(this);
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}
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else
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restart (RESTART_SERIAL_IRR, false);
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this->state |= (STATE_SERIAL | STATE_IRREVOCABLE);
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set_abi_disp (dispatch_serialirr ());
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}
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void ITM_REGPARM
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_ITM_changeTransactionMode (_ITM_transactionState state)
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{
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assert (state == modeSerialIrrevocable);
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gtm_thr()->serialirr_mode ();
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}
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