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356 lines
16 KiB
C++
356 lines
16 KiB
C++
/* Copyright (C) 2011-2024 Free Software Foundation, Inc.
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Contributed by Torvald Riegel <triegel@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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#ifndef DISPATCH_H
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#define DISPATCH_H 1
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#include "libitm.h"
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#include "common.h"
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// Creates ABI load/store methods (can be made virtual or static using M,
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// use M2 to create separate methods names for virtual and static)
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// The _PV variants are for the pure-virtual methods in the base class.
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#define ITM_READ_M(T, LSMOD, M, M2) \
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M _ITM_TYPE_##T ITM_REGPARM ITM_##LSMOD##T##M2 (const _ITM_TYPE_##T *ptr) \
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{ \
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return load(ptr, abi_dispatch::LSMOD); \
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}
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#define ITM_READ_M_PV(T, LSMOD, M, M2) \
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M _ITM_TYPE_##T ITM_REGPARM ITM_##LSMOD##T##M2 (const _ITM_TYPE_##T *ptr) \
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= 0;
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#define ITM_WRITE_M(T, LSMOD, M, M2) \
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M void ITM_REGPARM ITM_##LSMOD##T##M2 (_ITM_TYPE_##T *ptr, \
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_ITM_TYPE_##T val) \
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{ \
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store(ptr, val, abi_dispatch::LSMOD); \
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}
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#define ITM_WRITE_M_PV(T, LSMOD, M, M2) \
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M void ITM_REGPARM ITM_##LSMOD##T##M2 (_ITM_TYPE_##T *ptr, \
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_ITM_TYPE_##T val) \
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= 0;
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// Creates ABI load/store methods for all load/store modifiers for a particular
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// type.
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#define CREATE_DISPATCH_METHODS_T(T, M, M2) \
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ITM_READ_M(T, R, M, M2) \
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ITM_READ_M(T, RaR, M, M2) \
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ITM_READ_M(T, RaW, M, M2) \
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ITM_READ_M(T, RfW, M, M2) \
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ITM_WRITE_M(T, W, M, M2) \
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ITM_WRITE_M(T, WaR, M, M2) \
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ITM_WRITE_M(T, WaW, M, M2)
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#define CREATE_DISPATCH_METHODS_T_PV(T, M, M2) \
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ITM_READ_M_PV(T, R, M, M2) \
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ITM_READ_M_PV(T, RaR, M, M2) \
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ITM_READ_M_PV(T, RaW, M, M2) \
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ITM_READ_M_PV(T, RfW, M, M2) \
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ITM_WRITE_M_PV(T, W, M, M2) \
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ITM_WRITE_M_PV(T, WaR, M, M2) \
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ITM_WRITE_M_PV(T, WaW, M, M2)
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// Creates ABI load/store methods for all types.
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// See CREATE_DISPATCH_FUNCTIONS for comments.
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#define CREATE_DISPATCH_METHODS(M, M2) \
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CREATE_DISPATCH_METHODS_T (U1, M, M2) \
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CREATE_DISPATCH_METHODS_T (U2, M, M2) \
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CREATE_DISPATCH_METHODS_T (U4, M, M2) \
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CREATE_DISPATCH_METHODS_T (U8, M, M2) \
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CREATE_DISPATCH_METHODS_T (F, M, M2) \
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CREATE_DISPATCH_METHODS_T (D, M, M2) \
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CREATE_DISPATCH_METHODS_T (E, M, M2) \
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CREATE_DISPATCH_METHODS_T (CF, M, M2) \
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CREATE_DISPATCH_METHODS_T (CD, M, M2) \
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CREATE_DISPATCH_METHODS_T (CE, M, M2)
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#define CREATE_DISPATCH_METHODS_PV(M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (U1, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (U2, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (U4, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (U8, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (F, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (D, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (E, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (CF, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (CD, M, M2) \
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CREATE_DISPATCH_METHODS_T_PV (CE, M, M2)
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// Creates memcpy/memmove/memset methods.
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#define CREATE_DISPATCH_METHODS_MEM() \
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virtual void memtransfer(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 (size > 0) \
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memtransfer_static(dst, src, size, may_overlap, dst_mod, src_mod); \
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} \
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virtual void memset(void *dst, int c, size_t size, ls_modifier mod) \
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{ \
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if (size > 0) \
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memset_static(dst, c, size, mod); \
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}
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#define CREATE_DISPATCH_METHODS_MEM_PV() \
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virtual void memtransfer(void *dst, const void* src, size_t size, \
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bool may_overlap, ls_modifier dst_mod, ls_modifier src_mod) = 0; \
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virtual void memset(void *dst, int c, size_t size, ls_modifier mod) = 0;
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// Creates ABI load/store functions that can target either a class or an
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// object.
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#define ITM_READ(T, LSMOD, TARGET, M2) \
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_ITM_TYPE_##T ITM_REGPARM _ITM_##LSMOD##T (const _ITM_TYPE_##T *ptr) \
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{ \
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return TARGET ITM_##LSMOD##T##M2(ptr); \
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}
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#define ITM_WRITE(T, LSMOD, TARGET, M2) \
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void ITM_REGPARM _ITM_##LSMOD##T (_ITM_TYPE_##T *ptr, _ITM_TYPE_##T val) \
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{ \
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TARGET ITM_##LSMOD##T##M2(ptr, val); \
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}
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// Creates ABI load/store functions for all load/store modifiers for a
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// particular type.
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#define CREATE_DISPATCH_FUNCTIONS_T(T, TARGET, M2) \
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ITM_READ(T, R, TARGET, M2) \
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ITM_READ(T, RaR, TARGET, M2) \
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ITM_READ(T, RaW, TARGET, M2) \
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ITM_READ(T, RfW, TARGET, M2) \
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ITM_WRITE(T, W, TARGET, M2) \
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ITM_WRITE(T, WaR, TARGET, M2) \
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ITM_WRITE(T, WaW, TARGET, M2)
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// Creates ABI memcpy/memmove/memset functions.
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#define ITM_MEMTRANSFER_DEF(TARGET, M2, NAME, READ, WRITE) \
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void ITM_REGPARM _ITM_memcpy##NAME(void *dst, const void *src, size_t size) \
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{ \
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TARGET memtransfer##M2 (dst, src, size, \
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false, GTM::abi_dispatch::WRITE, GTM::abi_dispatch::READ); \
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} \
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void ITM_REGPARM _ITM_memmove##NAME(void *dst, const void *src, size_t size) \
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{ \
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TARGET memtransfer##M2 (dst, src, size, \
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GTM::abi_dispatch::memmove_overlap_check(dst, src, size, \
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GTM::abi_dispatch::WRITE, GTM::abi_dispatch::READ), \
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GTM::abi_dispatch::WRITE, GTM::abi_dispatch::READ); \
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}
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#define ITM_MEMSET_DEF(TARGET, M2, WRITE) \
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void ITM_REGPARM _ITM_memset##WRITE(void *dst, int c, size_t size) \
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{ \
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TARGET memset##M2 (dst, c, size, GTM::abi_dispatch::WRITE); \
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} \
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// ??? The number of virtual methods is large (7*4 for integers, 7*6 for FP,
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// 7*3 for vectors). Is the cache footprint so costly that we should go for
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// a small table instead (i.e., only have two virtual load/store methods for
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// each supported type)? Note that this doesn't affect custom code paths at
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// all because these use only direct calls.
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// A large cache footprint could especially decrease HTM performance (due
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// to HTM capacity). We could add the modifier (RaR etc.) as parameter, which
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// would give us just 4*2+6*2+3*2 functions (so we'd just need one line for
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// the integer loads/stores), but then the modifier can be checked only at
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// runtime.
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// For memcpy/memmove/memset, we just have two virtual methods (memtransfer
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// and memset).
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#define CREATE_DISPATCH_FUNCTIONS(TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (U1, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (U2, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (U4, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (U8, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (F, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (D, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (E, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (CF, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (CD, TARGET, M2) \
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CREATE_DISPATCH_FUNCTIONS_T (CE, TARGET, M2) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RnWt, NONTXNAL, W) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RnWtaR, NONTXNAL, WaR) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RnWtaW, NONTXNAL, WaW) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtWn, R, NONTXNAL) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtWt, R, W) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtWtaR, R, WaR) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtWtaW, R, WaW) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaRWn, RaR, NONTXNAL) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaRWt, RaR, W) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaRWtaR, RaR, WaR) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaRWtaW, RaR, WaW) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaWWn, RaW, NONTXNAL) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaWWt, RaW, W) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaWWtaR, RaW, WaR) \
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ITM_MEMTRANSFER_DEF(TARGET, M2, RtaWWtaW, RaW, WaW) \
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ITM_MEMSET_DEF(TARGET, M2, W) \
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ITM_MEMSET_DEF(TARGET, M2, WaR) \
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ITM_MEMSET_DEF(TARGET, M2, WaW)
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// Creates ABI load/store functions that delegate to a transactional memcpy.
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#define ITM_READ_MEMCPY(T, LSMOD, TARGET, M2) \
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_ITM_TYPE_##T ITM_REGPARM _ITM_##LSMOD##T (const _ITM_TYPE_##T *ptr)\
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{ \
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_ITM_TYPE_##T v; \
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TARGET memtransfer##M2(&v, ptr, sizeof(_ITM_TYPE_##T), false, \
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GTM::abi_dispatch::NONTXNAL, GTM::abi_dispatch::LSMOD); \
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return v; \
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}
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#define ITM_WRITE_MEMCPY(T, LSMOD, TARGET, M2) \
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void ITM_REGPARM _ITM_##LSMOD##T (_ITM_TYPE_##T *ptr, _ITM_TYPE_##T val)\
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{ \
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TARGET memtransfer##M2(ptr, &val, sizeof(_ITM_TYPE_##T), false, \
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GTM::abi_dispatch::LSMOD, GTM::abi_dispatch::NONTXNAL); \
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}
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#define CREATE_DISPATCH_FUNCTIONS_T_MEMCPY(T, TARGET, M2) \
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ITM_READ_MEMCPY(T, R, TARGET, M2) \
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ITM_READ_MEMCPY(T, RaR, TARGET, M2) \
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ITM_READ_MEMCPY(T, RaW, TARGET, M2) \
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ITM_READ_MEMCPY(T, RfW, TARGET, M2) \
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ITM_WRITE_MEMCPY(T, W, TARGET, M2) \
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ITM_WRITE_MEMCPY(T, WaR, TARGET, M2) \
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ITM_WRITE_MEMCPY(T, WaW, TARGET, M2)
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namespace GTM HIDDEN {
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struct gtm_transaction_cp;
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struct method_group
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{
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// Start using a TM method from this group. This constructs required meta
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// data on demand when this method group is actually used. Will be called
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// either on first use or after a previous call to fini().
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virtual void init() = 0;
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// Stop using any method from this group for now. This can be used to
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// destruct meta data as soon as this method group is not used anymore.
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virtual void fini() = 0;
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// This can be overriden to implement more light-weight re-initialization.
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virtual void reinit()
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{
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fini();
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init();
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}
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};
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// This is the base interface that all TM methods have to implement.
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struct abi_dispatch
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{
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public:
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enum ls_modifier { NONTXNAL, R, RaR, RaW, RfW, W, WaR, WaW };
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private:
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// Disallow copies
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abi_dispatch(const abi_dispatch &) = delete;
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abi_dispatch& operator=(const abi_dispatch &) = delete;
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public:
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// Starts or restarts a transaction. Is called right before executing the
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// transactional application code (by either returning from
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// gtm_thread::begin_transaction or doing the longjmp when restarting).
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// Returns NO_RESTART if the transaction started successfully. Returns
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// a real restart reason if it couldn't start and does need to abort. This
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// allows TM methods to just give up and delegate ensuring progress to the
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// restart mechanism. If it returns a restart reason, this call must be
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// idempotent because it will trigger the restart mechanism, which could
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// switch to a different TM method.
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virtual gtm_restart_reason begin_or_restart() = 0;
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// Tries to commit the transaction. Iff this returns true, the transaction
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// got committed and all per-transaction data will have been reset.
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// Currently, this is called only for the commit of the outermost
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// transaction, or when switching to serial mode (which can happen in a
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// nested transaction).
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// If privatization safety must be ensured in a quiescence-based way, set
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// priv_time to a value different to 0. Nontransactional code will not be
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// executed after this commit until all registered threads' shared_state is
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// larger than or equal to this value.
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virtual bool trycommit(gtm_word& priv_time) = 0;
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// Rolls back a transaction. Called on abort or after trycommit() returned
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// false.
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virtual void rollback(gtm_transaction_cp *cp = 0) = 0;
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// Returns true iff the snapshot is most recent, which will be the case if
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// this transaction cannot be the reason why other transactions cannot
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// ensure privatization safety.
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virtual bool snapshot_most_recent() = 0;
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// Return an alternative method that is compatible with the current
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// method but supports closed nesting. Return zero if there is none.
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// Note that too be compatible, it must be possible to switch to this other
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// method on begin of a nested transaction without committing or restarting
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// the parent method.
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virtual abi_dispatch* closed_nesting_alternative() { return 0; }
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// Returns true iff this method group supports the current situation.
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// NUMBER_OF_THREADS is the current number of threads that might execute
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// transactions.
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virtual bool supports(unsigned number_of_threads) { return true; }
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bool read_only () const { return m_read_only; }
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bool write_through() const { return m_write_through; }
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bool can_run_uninstrumented_code() const
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{
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return m_can_run_uninstrumented_code;
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}
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// Returns true iff this TM method supports closed nesting.
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bool closed_nesting() const { return m_closed_nesting; }
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// Returns STATE_SERIAL or STATE_SERIAL | STATE_IRREVOCABLE iff the TM
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// method only works for serial-mode transactions.
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uint32_t requires_serial() const { return m_requires_serial; }
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method_group* get_method_group() const { return m_method_group; }
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static void *operator new(size_t s) { return xmalloc (s); }
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static void operator delete(void *p) { free (p); }
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public:
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static bool memmove_overlap_check(void *dst, const void *src, size_t size,
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ls_modifier dst_mod, ls_modifier src_mod);
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// Creates the ABI dispatch methods for loads and stores.
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// ??? Should the dispatch table instead be embedded in the dispatch object
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// to avoid the indirect lookup in the vtable?
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CREATE_DISPATCH_METHODS_PV(virtual, )
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// Creates the ABI dispatch methods for memcpy/memmove/memset.
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CREATE_DISPATCH_METHODS_MEM_PV()
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protected:
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const bool m_read_only;
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const bool m_write_through;
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const bool m_can_run_uninstrumented_code;
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const bool m_closed_nesting;
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const uint32_t m_requires_serial;
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method_group* const m_method_group;
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abi_dispatch(bool ro, bool wt, bool uninstrumented, bool closed_nesting,
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uint32_t requires_serial, method_group* mg) :
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m_read_only(ro), m_write_through(wt),
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m_can_run_uninstrumented_code(uninstrumented),
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m_closed_nesting(closed_nesting), m_requires_serial(requires_serial),
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m_method_group(mg)
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{ }
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};
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}
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#endif // DISPATCH_H
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