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Diffstat (limited to 'erts/lib_src/utils')
| -rwxr-xr-x | erts/lib_src/utils/make_atomics_api | 2186 |
1 files changed, 2186 insertions, 0 deletions
diff --git a/erts/lib_src/utils/make_atomics_api b/erts/lib_src/utils/make_atomics_api new file mode 100755 index 0000000000..f4e71c7618 --- /dev/null +++ b/erts/lib_src/utils/make_atomics_api @@ -0,0 +1,2186 @@ +#!/usr/bin/env escript +%% -*- erlang -*- + +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2011. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% + +-mode(compile). + +%%%------------------------------------------------------------------- +%%% @author Rickard Green <[email protected]> +%%% @copyright (C) 2011, Rickard Green +%%% @doc +%%% Generation of the ethread atomic API +%%% @end +%%% Created : 17 Jan 2011 by Rickard Green <[email protected]> +%%%------------------------------------------------------------------- + +-define(H_FILE, "erts/include/internal/ethr_atomics.h"). +-define(C_FILE, "erts/lib_src/common/ethr_atomics.c"). + +%% These order constraints are important: +%% - 'cmpxchg' needs to appear before 'read' +%% - 'xchg' needs to apper before 'set' +%% - 'set' needs to apper before 'init' +%% - 'add_read' needs to apper before 'add', 'inc_read', and 'dec_read' +%% - 'inc_read' needs to apper before and 'inc' +%% - 'dec_read' needs to apper before and 'dec' +-define(ATOMIC_OPS, [cmpxchg, xchg, set, init, add_read, + read, inc_read, dec_read, add, inc, + dec, read_band, read_bor]). + +-define(DW_ATOMIC_OPS, [cmpxchg, set, read, init]). +-define(DW_FUNC_MACRO, "ETHR_DW_ATOMIC_FUNC__"). +-define(DW_RTCHK_MACRO, "ETHR_RTCHK_USE_NATIVE_DW_ATOMIC_IMPL__"). + +%% Barrier versions we implement +-define(BARRIERS, [none, rb, wb, acqb, relb, mb]). + +-define(ATOMIC_SIZES, ["dword", "word", "32"]). + +-define(HAVE_NATIVE_ATOMIC, "ETHR_HAVE_ETHR_NATIVE_ATOMIC"). + +-define(SU_DW_SINT_FIELD, "dw_sint"). +-define(DW_SINT_FIELD, "sint"). + +%% Fallback +-define(ETHR_ATMC_FLLBK_ADDR_BITS, "10"). +-define(ETHR_ATMC_FLLBK_ADDR_SHIFT, "6"). + +-record(atomic_context, {dw, + amc_fallback, + ret_type, + ret_var, + arg1, + arg2, + arg3, + have_native_atomic_ops, + atomic, + atomic_t, + addr_aint_t, + aint_t, + naint_t, + 'NATMC', + 'ATMC', + unusual_val}). + +atomic_context("dword") -> + #atomic_context{dw = true, + amc_fallback = true, + ret_type = "int", + ret_var = "res", + arg1 = "var", + arg2 = "val", + arg3 = "old_val", + have_native_atomic_ops = "ETHR_HAVE_DOUBLE_WORD_SZ_NATIVE_ATOMIC_OPS", + atomic = "ethr_dw_atomic", + atomic_t = "ethr_dw_atomic_t", + addr_aint_t = "ethr_sint_t", + aint_t = "ethr_dw_sint_t", + naint_t = "ETHR_SU_DW_NAINT_T__", + 'NATMC' = "DW_NATMC", + 'ATMC' = "DW_ATMC", + unusual_val = "ETHR_UNUSUAL_SINT_VAL__"}; +atomic_context(Size) -> + {SizeSuffix, HaveSize, AMC} = case Size of + "word" -> {"", "WORD_SZ", true}; + _ -> {Size, Size++"BIT", false} + end, + AintT = ["ethr_sint", SizeSuffix, "_t"], + #atomic_context{dw = false, + amc_fallback = AMC, + ret_type = AintT, + ret_var = "res", + arg1 = "var", + arg2 = "val", + arg3 = "old_val", + have_native_atomic_ops = ["ETHR_HAVE_", HaveSize, "_NATIVE_ATOMIC_OPS"], + atomic = ["ethr_atomic", SizeSuffix], + atomic_t = ["ethr_atomic", SizeSuffix, "_t"], + addr_aint_t = AintT, + aint_t = AintT, + naint_t = ["ETHR_NAINT", SizeSuffix, "_T__"], + 'NATMC' = ["NATMC", SizeSuffix], + 'ATMC' = ["ATMC", SizeSuffix], + unusual_val = ["ETHR_UNUSUAL_SINT", SizeSuffix, "_VAL__"]}. + +-record(op_context, {ret, var, val1, val2}). + +-define(POTENTIAL_NBITS, ["64", "32"]). + +is_return_op(#atomic_context{dw = false}, add) -> false; +is_return_op(#atomic_context{dw = false}, inc) -> false; +is_return_op(#atomic_context{dw = false}, dec) -> false; +is_return_op(#atomic_context{dw = true}, read) -> false; +is_return_op(_AC, init) -> false; +is_return_op(_AC, set) -> false; +is_return_op(_AC, _OP) -> true. + +native(add_read) -> add_return; +native(inc_read) -> inc_return; +native(dec_read) -> dec_return; +native(read_band) -> and_retold; +native(read_bor) -> or_retold; +native(Op) -> Op. + +op(Op, #op_context{var = Var, val1 = Val1}) when Op == init; Op == set -> + [Var, " = ", Val1]; +op(read, #op_context{ret = Ret, var = Var}) -> + [Ret, " = ", Var]; +op(add_read, OpC) -> + [op(add, OpC), "; ", op(read, OpC)]; +op(add, #op_context{var = Var, val1 = Val1}) -> + [Var, " += ", Val1]; +op(inc, #op_context{var = Var}) -> + ["++(", Var, ")"]; +op(dec, #op_context{var = Var}) -> + ["--(", Var, ")"]; +op(inc_read, #op_context{ret = Ret, var = Var}) -> + [Ret, " = ++(", Var, ")"]; +op(dec_read, #op_context{ret = Ret, var = Var}) -> + [Ret, " = --(", Var, ")"]; +op(read_band, #op_context{var = Var, val1 = Val1} = OpC) -> + [op(read, OpC), "; ", Var, " &= ", Val1]; +op(read_bor, #op_context{var = Var, val1 = Val1} = OpC) -> + [op(read, OpC), "; ", Var, " |= ", Val1]; +op(xchg, OpC) -> + [op(read, OpC), "; ", op(set, OpC)]; +op(cmpxchg, #op_context{ret = Ret, var = Var, val1 = Val1, val2 = Val2}) -> + [Ret, " = (", Var, " == ", Val2, " ? (", Var, " = ", Val1, ", ", Val2, ") : ", Var, ")"]. + +dw_op(Op, #op_context{var = Var, val1 = Val1}) when Op == init; Op == set -> + [Var, "[0] = ", Val1, "[0]; ", Var, "[1] = ", Val1, "[1]"]; +dw_op(read, #op_context{var = Var, val1 = Val1}) -> + [Val1, "[0] = ", Var, "[0]; ", Val1, "[1] = ", Var, "[1]"]; +dw_op(cmpxchg, #op_context{ret = Ret, var = Var, val1 = Val1, val2 = Val2}) -> + [" + { + ", Ret, " = (", Var, "[0] == ", Val2, "[0] && ", Var, "[1] == ", Val2, "[1]); + if (", Ret, ") { + ", Var, "[0] = ", Val1, "[0]; + ", Var, "[1] = ", Val1, "[1]; + } + else { + ", Val2, "[0] = ", Var, "[0]; + ", Val2, "[1] = ", Var, "[1]; + } + }"]. + +op_head_tail(init) -> {undef, undef}; +op_head_tail(set) -> {store, store}; +op_head_tail(read) -> {load, load}; +op_head_tail(_) -> {load, undef}. + +op_barrier_ext(none) -> ""; +op_barrier_ext(Barrier) -> [$_, a2l(Barrier)]. + +op_call(addr, _DW, Ret, Func, Arg1, _Arg2, _Arg3, _TypeCast) -> + [Ret, " ", Func, "(", Arg1, ");"]; +op_call(Op, false, Ret, Func, Arg1, _Arg2, _Arg3, _TypeCast) when Op == read; + Op == inc_read; + Op == inc_return; + Op == dec_read; + Op == dec_return -> + [Ret, " ", Func, "(", Arg1, ");"]; +op_call(Op, false, _Ret, Func, Arg1, _Arg2, _Arg3, _TypeCast) when Op == inc; + Op == dec -> + [Func, "(", Arg1, ");"]; +op_call(Op, false, Ret, Func, Arg1, Arg2, _Arg3, TypeCast) when Op == add_return; + Op == add_read; + Op == read_band; + Op == and_retold; + Op == read_bor; + Op == or_retold; + Op == xchg -> + [Ret, " ", Func, "(", Arg1, ",", TypeCast, " ", Arg2, ");"]; +op_call(cmpxchg, _DW, Ret, Func, Arg1, Arg2, Arg3, TypeCast) -> + [Ret, " ", Func, "(", Arg1, ",", TypeCast, " ", Arg2, ",", TypeCast, " ", Arg3, ");"]; +op_call(_Op, _DW, _Ret, Func, Arg1, Arg2, _Arg3, TypeCast) -> + [Func, "(", Arg1, ",", TypeCast, " ", Arg2, ");"]. % set, init, add (!= dw), read (== dw) + +native_op_call(#atomic_context{dw = DW, + ret_var = RetVar, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3, + aint_t = AintT, + 'NATMC' = NATMC, + naint_t = NAintT}, + Op, B, TypeCasts) -> + op_call(Op, + DW, + [RetVar, " =", + case TypeCasts of + true -> [" (", AintT, ")"]; + false -> "" + end], + ["ETHR_", NATMC, "_FUNC__(", opstr(native(Op)), op_barrier_ext(B), ")"], + Arg1, + Arg2, + Arg3, + case TypeCasts of + true -> [" (", NAintT, ")"]; + false -> "" + end). + +simple_fallback(#atomic_context{arg1 = Arg1, + arg2 = Arg2, + 'ATMC' = ATMC}, + init, B) -> %% Also double word + [" ETHR_", ATMC, "_FUNC__(set", op_barrier_ext(B),")(", Arg1, ", ", Arg2, ");\n"]; +simple_fallback(#atomic_context{dw = false, + arg1 = Arg1, + arg2 = Arg2, + 'ATMC' = ATMC}, + set, B) -> + [" (void) ETHR_", ATMC, "_FUNC__(xchg", op_barrier_ext(B),")(", Arg1, ", ", Arg2, ");\n"]; +simple_fallback(#atomic_context{dw = false, + arg1 = Arg1, + arg2 = Arg2, + 'ATMC' = ATMC}, + add, B) -> + [" (void) ETHR_", ATMC, "_FUNC__(add_read", op_barrier_ext(B), ")(", Arg1, ", ", Arg2, ");\n"]; +simple_fallback(#atomic_context{dw = false, + ret_var = RetVar, + arg1 = Arg1, + aint_t = AintT, + 'ATMC' = ATMC}, + inc_read, B) -> + [" ", RetVar, " = ETHR_", ATMC, "_FUNC__(add_read", op_barrier_ext(B), ")(", Arg1, ", (", AintT,") 1);\n"]; +simple_fallback(#atomic_context{dw = false, + ret_var = RetVar, + arg1 = Arg1, + aint_t = AintT, + 'ATMC' = ATMC}, + dec_read, B) -> + [" ", RetVar, " = ETHR_", ATMC, "_FUNC__(add_read", op_barrier_ext(B), ")(", Arg1, ", (", AintT,") -1);\n"]; +simple_fallback(#atomic_context{dw = false, + arg1 = Arg1, + 'ATMC' = ATMC}, + inc, B) -> + [" (void) ETHR_", ATMC, "_FUNC__(inc_read", op_barrier_ext(B), ")(", Arg1, ");\n"]; +simple_fallback(#atomic_context{dw = false, + arg1 = Arg1, + 'ATMC' = ATMC}, + dec, B) -> + [" (void) ETHR_", ATMC, "_FUNC__(dec_read", op_barrier_ext(B), ")(", Arg1, ");\n"]; +simple_fallback(#atomic_context{dw = false, + unusual_val = UnusualVal, + ret_var = RetVar, + arg1 = Arg1, + aint_t = AintT, + 'ATMC' = ATMC}, + read, B) -> + [" ", RetVar, " = ETHR_", ATMC, "_FUNC__(cmpxchg", op_barrier_ext(B), ")(", Arg1, ", (", AintT, ") ", UnusualVal, ", (", AintT,") ", UnusualVal, ");\n"]; +simple_fallback(#atomic_context{dw = true, + unusual_val = UnusualVal, + arg1 = Arg1, + arg2 = Arg2, + aint_t = AintT, + 'ATMC' = ATMC}, + read, B) -> + [" ", AintT, " tmp; + tmp.", ?DW_SINT_FIELD, "[0] = ", UnusualVal, "; + tmp.", ?DW_SINT_FIELD, "[1] = ", UnusualVal, "; + ", Arg2, "->", ?DW_SINT_FIELD, "[0] = ", UnusualVal, "; + ", Arg2, "->", ?DW_SINT_FIELD, "[1] = ", UnusualVal, "; + (void) ETHR_", ATMC, "_FUNC__(cmpxchg", op_barrier_ext(B), ")(", Arg1, ", &tmp, ", Arg2, "); +" + ]; +simple_fallback(_AC, _Op, _B) -> + []. + +func_header(AC, prototype, MacroName, Op, B) -> + [func_header(AC, implementation, MacroName, Op, B), ";"]; +func_header(#atomic_context{'ATMC' = ATMC} = AC, inline_implementation, _MacroName, Op, B) -> + do_func_header(AC, Op, "static ETHR_INLINE ", + ["ETHR_", ATMC, "_FUNC__(", opstr(Op), op_barrier_ext(B), ")"]); +func_header(#atomic_context{atomic = Atomic} = AC, implementation, false, Op, B) -> + do_func_header(AC, Op, "", [Atomic, "_", opstr(Op), op_barrier_ext(B)]); +func_header(AC, implementation, MacroName, Op, B) -> + do_func_header(AC, Op, "", [MacroName, "(", opstr(Op), op_barrier_ext(B), ")"]). + + +do_func_header(#atomic_context{atomic_t = AtomicT, + addr_aint_t = AddrAintT, + arg1 = Arg1}, + addr, Inline, Func) -> + [Inline, AddrAintT, " *", Func, "(", AtomicT, " *", Arg1, ")"]; +do_func_header(#atomic_context{dw = false, + atomic_t = AtomicT, + aint_t = AintT, + arg1 = Arg1, + arg2 = Arg2}, + Op, Inline, Func) when Op == init; + Op == set; + Op == add -> + [Inline, "void ", Func, "(", AtomicT, " *", Arg1, ", ", AintT, " ", Arg2, ")"]; +do_func_header(#atomic_context{dw = false, + atomic_t = AtomicT, + arg1 = Arg1}, + Op, Inline, Func) when Op == inc; + Op == dec -> + [Inline, "void ", Func, "(", AtomicT, " *", Arg1, ")"]; +do_func_header(#atomic_context{dw = false, + atomic_t = AtomicT, + aint_t = AintT, + arg1 = Arg1}, + Op, Inline, Func) when Op == read; + Op == inc_read; + Op == dec_read -> + [Inline, AintT, " ", Func, "(", AtomicT, " *", Arg1, ")"]; +do_func_header(#atomic_context{dw = false, + atomic_t = AtomicT, + aint_t = AintT, + arg1 = Arg1, + arg2 = Arg2}, + Op, Inline, Func) when Op == add_read; + Op == read_band; + Op == read_bor; + Op == xchg -> + [Inline, AintT, " ", Func, "(", AtomicT, " *", Arg1, ", ", AintT, " ", Arg2, ")"]; +do_func_header(#atomic_context{dw = false, + atomic_t = AtomicT, + aint_t = AintT, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3}, + cmpxchg, Inline, Func) -> + [Inline, AintT, " ", Func, "(", AtomicT, " *", Arg1, ", ", AintT, " ", Arg2, ", ", AintT, " ", Arg3, ")"]; +do_func_header(#atomic_context{dw = true, + atomic_t = AtomicT, + aint_t = AintT, + arg1 = Arg1, + arg2 = Arg2}, + Op, Inline, Func) when Op == init; + Op == set; + Op == read -> + [Inline, "void ", Func, "(", AtomicT, " *", Arg1, ", ", AintT, " *", Arg2, ")"]; +do_func_header(#atomic_context{dw = true, + atomic_t = AtomicT, + aint_t = AintT, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3}, + cmpxchg, Inline, Func) -> + [Inline, "int ", Func, "(", AtomicT, " *", Arg1, ", ", AintT, " *", Arg2, ", ", AintT, " *", Arg3, ")"]. + + +xbarriers(_Op, none, _NB) -> + {"", ""}; + +xbarriers(_Op, acqb, NB) when NB == acqb; NB == mb -> + {"", ""}; +xbarriers(Op, acqb, NB) -> + case {op_head_tail(Op), NB} of + {{_, load}, rb} -> {"", "ETHR_MEMBAR(ETHR_LoadStore);"}; + {{_, load}, _} -> {"", "ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore);"}; + {{_, store}, _} -> {"", "ETHR_MEMBAR(ETHR_StoreLoad|ETHR_StoreStore);"}; + {_, rb} -> {"", "ETHR_MEMBAR(ETHR_LoadStore|ETHR_StoreLoad|ETHR_StoreStore);"}; + _ -> {"", "ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore|ETHR_StoreLoad|ETHR_StoreStore);"} + end; + +xbarriers(_Op, relb, NB) when NB == relb; NB == mb -> + {"", ""}; +xbarriers(Op, relb, NB) -> + case {op_head_tail(Op), NB} of + {{store, _}, wb} -> {"ETHR_MEMBAR(ETHR_LoadStore);", ""}; + {{store, _}, _} -> {"ETHR_MEMBAR(ETHR_LoadStore|ETHR_StoreStore);", ""}; + {{load, _}, _} -> {"ETHR_MEMBAR(ETHR_LoadLoad|ETHR_StoreLoad);", ""}; + {_, wb} -> {"ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore|ETHR_StoreLoad);", ""}; + _ -> {"ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore|ETHR_StoreLoad|ETHR_StoreStore);", ""} + end; + +xbarriers(_Op, wb, NB) when NB == wb; NB == mb -> + {"", ""}; +xbarriers(_Op, wb, _NB) -> + {"ETHR_MEMBAR(ETHR_StoreStore);", ""}; + +xbarriers(_Op, rb, NB) when NB == rb; NB == mb -> + {"", ""}; +xbarriers(_Op, rb, _NB) -> + {"", "ETHR_MEMBAR(ETHR_LoadLoad);"}; + +xbarriers(_Op, mb, mb) -> + {"", ""}; +xbarriers(Op, mb, NB) -> + MB = "ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore|ETHR_StoreLoad|ETHR_StoreStore);", + {Head, Tail} = op_head_tail(Op), + PreOp = case {Head, NB} of + {_, relb} -> ""; + {store, wb} -> "ETHR_MEMBAR(ETHR_LoadStore);"; + {store, _} -> "ETHR_MEMBAR(ETHR_LoadStore|ETHR_StoreStore);"; + {load, _} -> "ETHR_MEMBAR(ETHR_LoadLoad|ETHR_StoreLoad);"; + {_, wb} -> "ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore|ETHR_StoreLoad);"; + _ -> MB + end, + PostOp = case {Tail, NB} of + {_, acqb} -> ""; + {load, rb} -> "ETHR_MEMBAR(ETHR_LoadStore);"; + {load, _} -> "ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore);"; + {store, _} -> "ETHR_MEMBAR(ETHR_StoreLoad|ETHR_StoreStore);"; + {_, rb} -> "ETHR_MEMBAR(ETHR_LoadStore|ETHR_StoreLoad|ETHR_StoreStore);"; + _ -> MB + end, + {PreOp, PostOp}. + +try_barrier_order_first(none) -> + [none, rb, wb, acqb, relb]; +try_barrier_order_first(acqb) -> + [acqb, rb, none, mb]; +try_barrier_order_first(relb) -> + [relb, wb, none, mb]; +try_barrier_order_first(rb) -> + [rb, none, mb]; +try_barrier_order_first(wb) -> + [wb, none, mb]; +try_barrier_order_first(mb) -> + [mb, relb, acqb, wb, rb, none]. + +try_barrier_order(B) -> + First = try_barrier_order_first(B), + First ++ (?BARRIERS -- First). + +native_barrier_op(#atomic_context{'NATMC' = NATMC} = AC, If, ExtraDecl, Op, B, NB, TypeCasts) -> + NOpStr = opstr(native(Op)), + CapNOpStr = to_upper(NOpStr), + NBExt = op_barrier_ext(NB), + CapNBExt = to_upper(NBExt), + {PreB, PostB} = xbarriers(Op, B, NB), + [If, " defined(ETHR_HAVE_", NATMC, "_", CapNOpStr, CapNBExt, ")\n", + ExtraDecl, + case PreB of + "" -> ""; + _ -> [" ", PreB, "\n"] + end, + " ", native_op_call(AC, Op, NB, TypeCasts), "\n", + case PostB of + "" -> ""; + _ -> [" ", PostB, "\n"] + end]. + +dw_native_barrier_op(#atomic_context{arg1 = Arg1, arg2 = Arg2, arg3 = Arg3} = AC, If, ExtraDecl, Op, B, NB) -> + native_barrier_op(AC#atomic_context{arg1 = ["&", Arg1, "->native"], + arg2 = [Arg2, "->", ?DW_SINT_FIELD], + arg3 = [Arg3, "->", ?DW_SINT_FIELD]}, + If, ExtraDecl, Op, B, NB, false). + +su_dw_native_barrier_op(#atomic_context{dw = true, + naint_t = NAintT, + ret_var = RetVar, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3, + 'NATMC' = NATMC} = AC, If, cmpxchg, B, NB) -> + SU = ["->", ?SU_DW_SINT_FIELD], + TmpVar = "act", + SUArg1 = ["&", Arg1, "->native"], + SUArg2 = [Arg2, SU], + SUArg3 = [Arg3, SU], + ExtraDecl = [" ", NAintT, " ", TmpVar, ";\n"], + [native_barrier_op(AC#atomic_context{dw = false, + ret_var = TmpVar, + arg1 = SUArg1, + arg2 = SUArg2, + arg3 = SUArg3, + 'NATMC' = ["SU_", NATMC]}, + If, ExtraDecl, cmpxchg, B, NB, false), + " ", RetVar, " = (", TmpVar, " == ", SUArg3, "); + ", SUArg3, " = ", TmpVar, "; +" + ]; +su_dw_native_barrier_op(#atomic_context{dw = true, + arg1 = Arg1, + arg2 = Arg2, + 'NATMC' = NATMC} = AC, If, Op, B, NB) -> + SUArg1 = ["&", Arg1, "->native"], + SUArg2 = [Arg2, "->", ?SU_DW_SINT_FIELD], + native_barrier_op(AC#atomic_context{dw = false, + ret_var = SUArg2, + arg1 = SUArg1, + arg2 = SUArg2, + arg3 = not_used, + 'NATMC' = ["SU_", NATMC]}, If, "", Op, B, NB, false). + +cmpxchg_fallback_define(#atomic_context{dw = false, aint_t = AintT} = AC) -> + do_cmpxchg_fallback_define(AC, true, AintT); +cmpxchg_fallback_define(#atomic_context{dw = true, + 'NATMC' = NATMC, + naint_t = NAintT} = AC) -> + ["\n\n#if defined(ETHR_HAVE_NATIVE_DW_ATOMIC)\n", + do_cmpxchg_fallback_define(AC, false, not_used), + "\n\n#elif defined(ETHR_HAVE_NATIVE_SU_DW_ATOMIC)\n", + do_cmpxchg_fallback_define(AC#atomic_context{'NATMC' = ["SU_", NATMC], + naint_t = NAintT}, + true, + NAintT), + " + +#else +# error \"?!?\" +#endif +"]. + +do_cmpxchg_fallback_define(#atomic_context{'NATMC' = NATMC, + aint_t = AintT, + naint_t = NAintT}, + SU, SUType) -> + + ReadFunc = fun (IF) -> + fun (B) -> + BExt = op_barrier_ext(B), + CapBExt = to_upper(BExt), + [IF, " defined(ETHR_HAVE_", NATMC, "_READ", CapBExt, ")", + case SU of + true -> [" +#define ETHR_", NATMC, "_CMPXCHG_FALLBACK_READ__(VAR) \\ + ETHR_", NATMC, "_FUNC__(read", BExt, ")(VAR) +" + ]; + false -> [" +#define ETHR_", NATMC, "_CMPXCHG_FALLBACK_READ__(VAR, VAL) \\ + ETHR_", NATMC, "_FUNC__(read", BExt, ")(VAR, VAL) +#elif defined(ETHR_HAVE_SU_", NATMC, "_READ", CapBExt, ") +#define ETHR_", NATMC, "_CMPXCHG_FALLBACK_READ__(VAR, VAL) \\ + VAL.", ?SU_DW_SINT_FIELD, " = ETHR_SU_", NATMC, "_FUNC__(read", BExt, ")(VAR) +" + ] + end] + end + end, + NotDefCMPXCHG = fun (B) -> + CapBExt = to_upper(op_barrier_ext(B)), + ["!defined(ETHR_HAVE_", NATMC, "_CMPXCHG", CapBExt, ")"] + end, + NoneTryBarrierOrder = try_barrier_order(none), + %% First a sanity check + [" +#if (", NotDefCMPXCHG(hd(?BARRIERS)) , + lists:map(fun (B) -> + [" \\ + && ", NotDefCMPXCHG(B)] + end, + tl(?BARRIERS)), ") +# error \"No native cmpxchg() op available\" +#endif + + +/* + * Read op used together with cmpxchg() fallback when no native op present. + */ +", + + %% Read op to use with cmpxchg fallback + (ReadFunc("#if"))(hd(NoneTryBarrierOrder)), + lists:map(ReadFunc("#elif"), tl(NoneTryBarrierOrder)), +"#else +/* + * We have no native read() op; guess zero and then use the + * the atomics actual value returned from cmpxchg(). + */", + case SU of + true -> [" +#define ETHR_", NATMC, "_CMPXCHG_FALLBACK_READ__(VAR) \\ + ((", NAintT, ") 0)"]; + false -> [" +#define ETHR_", NATMC, "_CMPXCHG_FALLBACK_READ__(VAR, VAL) \\ +do { \\ + VAL.", ?DW_SINT_FIELD, "[0] = (ethr_sint_t) 0; \\ + VAL.", ?DW_SINT_FIELD, "[1] = (ethr_sint_t) 0; \\ +} while (0)"] + end, " +#endif +", + + %% The fallback + " +/* + * Native cmpxchg() fallback used when no native op present. + */ +#define ETHR_", NATMC, "_CMPXCHG_FALLBACK__(CMPXCHG, VAR, AVAL, OPS) \\ +do { \\", + case SU of + true -> [" + ", SUType, " AVAL; \\ + ", NAintT, " new__, act__, exp__; \\ + act__ = ETHR_", NATMC, "_CMPXCHG_FALLBACK_READ__(VAR); \\ + do { \\ + exp__ = act__; \\ + AVAL = (", SUType, ") act__; \\ + { OPS; } \\ + new__ = (", NAintT, ") AVAL; \\ + act__ = CMPXCHG(VAR, new__, exp__); \\ + } while (__builtin_expect(act__ != exp__, 0)); \\"]; + false -> [" + int res__; \\ + ", AintT, " AVAL, exp_act__; \\ + ETHR_", NATMC, "_CMPXCHG_FALLBACK_READ__(VAR, exp_act__); \\ + do { \\ + AVAL.", ?DW_SINT_FIELD, "[0] = exp_act__.", ?DW_SINT_FIELD, "[0]; \\ + AVAL.", ?DW_SINT_FIELD, "[1] = exp_act__.", ?DW_SINT_FIELD, "[1]; \\ + { OPS; } \\ + res__ = CMPXCHG(VAR, AVAL.", ?DW_SINT_FIELD, ", exp_act__.", ?DW_SINT_FIELD, "); \\ + } while (__builtin_expect(res__ == 0, 0)); \\"] + end, " +} while (0) +" + ]. + +cmpxchg_fallbacks(#atomic_context{}, _SUDW, cmpxchg, _B) -> + ""; %% No need for a fallback +cmpxchg_fallbacks(#atomic_context{dw = DW, + ret_var = RetVar, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3, + 'NATMC' = NATMC}, + SUDW, Op, B) -> + Operation = case DW of + false -> + op(Op, #op_context{ret = RetVar, + var = "aval", + val1 = Arg2, + val2 = Arg3}); + true -> + case SUDW of + true -> + op(Op, #op_context{ret = [Arg2, "->", ?SU_DW_SINT_FIELD], + var = "aval", + val1 = [Arg2, "->", ?SU_DW_SINT_FIELD]}); + false -> + dw_op(Op, #op_context{ret = RetVar, + var = ["aval.", ?DW_SINT_FIELD], + val1 = [Arg2, "->", ?DW_SINT_FIELD]}) + end + end, + [lists:map(fun (NB) -> + NativeVar = case DW of + true -> ["&", Arg1, "->native"]; + false -> Arg1 + end, + NBExt = op_barrier_ext(NB), + CapNBExt = to_upper(NBExt), + {PreB, PostB} = xbarriers(cmpxchg, B, NB), + ["#elif defined(ETHR_HAVE_", NATMC, "_CMPXCHG", CapNBExt, ")\n", + case PreB of + "" -> ""; + _ -> [" ", PreB, "\n"] + end, + " ETHR_", NATMC, "_CMPXCHG_FALLBACK__(ETHR_", NATMC, "_FUNC__(cmpxchg", NBExt, "), ", NativeVar, ", aval, ", Operation, ");\n", + case PostB of + "" -> ""; + _ -> [" ", PostB, "\n"] + end] + end, + try_barrier_order(B))]. + +translate_have_defs(#atomic_context{dw = DW, 'NATMC' = NATMC}) -> + [" +#if !defined(ETHR_", NATMC, "_BITS__) +# error \"Missing native atomic implementation\"", + lists:map(fun (NBits) -> + {HaveInPrefix, + HaveOutPrefix, + HaveInPrefixExtra, + HaveOutPrefixExtra, + NativeTypeCheck} = case NBits of + "dw" -> + {"ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC", + ["ETHR_HAVE_", NATMC], + "ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC", + ["ETHR_HAVE_SU_", NATMC], + "\n#elif defined(ETHR_HAVE_NATIVE_DW_ATOMIC) || defined(ETHR_HAVE_NATIVE_SU_DW_ATOMIC)"}; + _ -> + {[?HAVE_NATIVE_ATOMIC, NBits], + case DW of + true -> ["ETHR_HAVE_SU_", NATMC]; + false -> ["ETHR_HAVE_", NATMC] + end, + false, + ["ETHR_HAVE_", NATMC], + ["\n#elif ETHR_", NATMC, "_BITS__ == ", NBits]} + end, + [NativeTypeCheck, + lists:map(fun (Op) -> + NOpStr = opstr(native(Op)), + CapNOpStr = to_upper(NOpStr), + lists:map(fun (B) -> + NBExt = op_barrier_ext(B), + CapNBExt = to_upper(NBExt), + HaveOutDef = [HaveOutPrefix, "_", CapNOpStr, CapNBExt], + HaveOutDefExtra = [HaveOutPrefixExtra, "_", CapNOpStr, CapNBExt], + [case DW of + true -> + ["\n# undef ", HaveOutDefExtra]; + false -> + "" + end, " +# undef ", HaveOutDef," +# ifdef ", HaveInPrefix, "_", CapNOpStr, CapNBExt, " +# define ", HaveOutDef, " 1 +# endif", + case HaveInPrefixExtra of + false -> ""; + _ -> [" +# ifdef ", HaveInPrefixExtra, "_", CapNOpStr, CapNBExt, " +# define ", HaveOutDefExtra, " 1 +# endif" + ] + end] + end, + ?BARRIERS) + end, + case DW of + true -> ?DW_ATOMIC_OPS; + false -> ?ATOMIC_OPS + end)] + end, + case DW of + true -> ["dw", "64"]; + false -> ?POTENTIAL_NBITS + end), + " +#else +# error \"Invalid native atomic size\" +#endif +"]. + + + +make_prototypes(#atomic_context{dw = DW, 'ATMC' = ATMC} = AC) -> + MkProt = fun (MacroName) -> + %% addr() is special + [func_header(AC, prototype, MacroName, addr, none), "\n", + lists:map(fun (Op) -> + lists:map(fun (B) -> + [func_header(AC, prototype, MacroName, Op, B), "\n"] + end, + ?BARRIERS) + end, + case DW of + true -> ?DW_ATOMIC_OPS; + false -> ?ATOMIC_OPS + end)] + end, + [" +#ifdef ETHR_NEED_", ATMC, "_PROTOTYPES__ +", + MkProt(false), + case DW of + true -> ["#if defined(", ?DW_RTCHK_MACRO, ")\n", + MkProt(?DW_FUNC_MACRO), + "#endif\n"]; + false -> "" + end, + "#endif /* ETHR_NEED_", ATMC, "_PROTOTYPES__ */\n"]. + +rtchk_fallback_call(Return, #atomic_context{dw = DW, + ret_var = RetVar, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3}, + Op, B) -> + op_call(Op, DW, case Return of + true -> "return"; + false -> [RetVar, " ="] + end, [?DW_FUNC_MACRO, "(", opstr(Op), op_barrier_ext(B), ")"], Arg1, Arg2, Arg3, ""). + +make_implementations(#atomic_context{dw = DW, + ret_type = RetType, + ret_var = RetVar, + arg1 = Arg1, + addr_aint_t = AddrAintT, + atomic = Atomic, + have_native_atomic_ops = HaveNativeAtomicOps, + 'ATMC' = ATMC, + 'NATMC' = NATMC} = AC) -> + NativeVar = case DW of + true -> ["(&", Arg1, "->native)"]; + false -> Arg1 + end, + RtchkBegin = [" +#if defined(", ?DW_RTCHK_MACRO, ") + if (", ?DW_RTCHK_MACRO, ") { +#endif +"], + RtchkEnd = fun (Return, Operation, Barrier) -> + [" +#if defined(", ?DW_RTCHK_MACRO, ") + } else { ", rtchk_fallback_call(Return, AC, Operation, Barrier), " } +#endif\n" + ] + end, + [" +#if (defined(", HaveNativeAtomicOps, ") \\ + && (defined(ETHR_", ATMC, "_INLINE__) || defined(ETHR_ATOMIC_IMPL__))) +", + translate_have_defs(AC), + cmpxchg_fallback_define(AC), + %% addr() is special + " + + +/* --- addr() --- */ + +", func_header(AC, inline_implementation, false, addr, none), " +{", case DW of + true -> RtchkBegin; + false -> "" + end, " + return (", AddrAintT, " *) ETHR_", NATMC, "_ADDR_FUNC__(", NativeVar, "); +",case DW of + true -> RtchkEnd(true, addr, none); + false -> "" + end, " +} +", + lists:map(fun (Op) -> + OpStr = opstr(Op), + [" + +/* --- ", OpStr, "() --- */ + +", + lists:map(fun (B) -> + TryBarriers = try_barrier_order(B), + [" +", func_header(AC, inline_implementation, false, Op, B), " +{ +", + case is_return_op(AC, Op) of + true -> + [" ", RetType, " ", RetVar, ";\n"]; + _ -> "" + end, + case DW of + true -> + [RtchkBegin, + "\n", + su_dw_native_barrier_op(AC, "#if", Op, B, hd(TryBarriers)), + lists:map(fun (NB) -> + su_dw_native_barrier_op(AC, "#elif", Op, B, NB) + end, + tl(TryBarriers)), + lists:map(fun (NB) -> + dw_native_barrier_op(AC, "#elif", "", Op, B, NB) + end, + TryBarriers), + case simple_fallback(AC, Op, B) of + "" -> + %% No simple fallback available; + %% use cmpxchg() fallbacks... + [cmpxchg_fallbacks(AC#atomic_context{'NATMC' = ["SU_", NATMC]}, true, Op, B), + cmpxchg_fallbacks(AC, false, Op, B), + "#else +#error \"Missing implementation of ", Atomic, "_", opstr(Op), op_barrier_ext(B), "()!\" +#endif +" + ]; + SimpleFallback -> + ["#else\n", SimpleFallback, "#endif\n"] + end, + RtchkEnd(false, Op, B), "\n"]; + false -> + [native_barrier_op(AC, "#if", "", Op, B, hd(TryBarriers), true), + lists:map(fun (NB) -> + native_barrier_op(AC, "#elif", "", Op, B, NB, true) + end, + tl(TryBarriers)), + case simple_fallback(AC, Op, B) of + "" -> + %% No simple fallback available; + %% use cmpxchg() fallbacks... + [cmpxchg_fallbacks(AC, false, Op, B), + "#else +#error \"Missing implementation of ", Atomic, "_", opstr(Op), op_barrier_ext(B), "()!\" +#endif +" + ]; + SimpleFallback -> + ["#else\n", SimpleFallback, "#endif\n"] + end] + end, + case is_return_op(AC, Op) of + true -> + [" return ", RetVar, ";\n"]; + false -> + "" + end, + "}\n"] + end, + ?BARRIERS)] + end, + case DW of + true -> ?DW_ATOMIC_OPS; + false -> ?ATOMIC_OPS + end), + " +#endif /* ETHR_", ATMC, "_INLINE__ */ +" + ]. + +atomic_implementation_comment(AtomicSize) -> + CSz = case AtomicSize of + "dword" -> "Double word size"; + "word" -> "Word size"; + _ -> AtomicSize ++ "-bit" + end, + [" + +/* ---------- ", CSz, " atomic implementation ---------- */ + +" + ]. + +write_h_file(FileName) -> + {ok, FD} = file:open(FileName, [write, latin1]), + ok = file:write(FD, comments()), + ok = file:write(FD, " +#ifndef ETHR_ATOMICS_H__ +#define ETHR_ATOMICS_H__ +" + ), + ok = file:write(FD, h_top()), + ok = lists:foreach(fun (AtomicSize) -> + AC = atomic_context(AtomicSize), + ok = file:write(FD, + [atomic_implementation_comment(AtomicSize), + make_prototypes(AC), + make_implementations(AC)]) + end, + ?ATOMIC_SIZES), + ok = file:write(FD, " +#endif /* ETHR_ATOMICS_H__ */ +" + ), + ok = file:close(FD). + + +make_native_impl_op(#atomic_context{dw = DW, + atomic = Atomic, + have_native_atomic_ops = HaveNativeAtomicOps, + ret_var = RetVar, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3}, Op, B) -> + ["#if defined(", HaveNativeAtomicOps, ")", + case DW of + true -> [" && !defined(", ?DW_RTCHK_MACRO, ")"]; + false -> "" + end, + "\n", + " ", op_call(Op, DW, [RetVar, " = "], [Atomic, "_", opstr(Op), op_barrier_ext(B), "__"], Arg1, Arg2, Arg3, ""), + "\n"]. + +amc_op_dw_arg(#atomic_context{dw = false}) -> + "0"; +amc_op_dw_arg(#atomic_context{dw = true}) -> + "1". + +amc_op_arg_prefix(#atomic_context{dw = false}) -> + "&"; +amc_op_arg_prefix(#atomic_context{dw = true}) -> + "". + +amc_sint_arg(#atomic_context{dw = DW, arg2 = Arg}, arg2) -> + amc_sint_arg(DW, Arg); +amc_sint_arg(#atomic_context{dw = DW, arg3 = Arg}, arg3) -> + amc_sint_arg(DW, Arg); +amc_sint_arg(#atomic_context{dw = DW, ret_var = Arg}, ret_var) -> + amc_sint_arg(DW, Arg); +amc_sint_arg(true, Arg) -> + [Arg, "->" ?DW_SINT_FIELD]; +amc_sint_arg(false, Arg) -> + ["&", Arg]. + +amc_op_call(#atomic_context{arg1 = Arg1} = AC, init) -> + [" amc_init(&", Arg1, "->amc, ", amc_op_dw_arg(AC), ", ", amc_op_arg_prefix(AC), Arg1, "->sint, ", amc_sint_arg(AC, arg2), ");\n"]; +amc_op_call(#atomic_context{arg1 = Arg1} = AC, set) -> + [" amc_set(&", Arg1, "->amc, ", amc_op_dw_arg(AC), ", ", amc_op_arg_prefix(AC), Arg1, "->sint, ", amc_sint_arg(AC, arg2), ");\n"]; +amc_op_call(#atomic_context{dw = false, arg1 = Arg1} = AC, read) -> + [" amc_read(&", Arg1, "->amc, ", amc_op_dw_arg(AC), ", ", amc_op_arg_prefix(AC), Arg1, "->sint, ", amc_sint_arg(AC, ret_var), ");\n"]; +amc_op_call(#atomic_context{dw = true, arg1 = Arg1} = AC, read) -> + [" amc_read(&", Arg1, "->amc, ", amc_op_dw_arg(AC), ", ", amc_op_arg_prefix(AC), Arg1, "->sint, ", amc_sint_arg(AC, arg2), ");\n"]; +amc_op_call(#atomic_context{dw = false, arg1 = Arg1, arg3 = Arg3, ret_var = RetVar} = AC, cmpxchg) -> + [" ", RetVar, " = ", Arg3, "; + (void) amc_cmpxchg(&", Arg1, "->amc, ", amc_op_dw_arg(AC), ", ", amc_op_arg_prefix(AC), Arg1, "->sint, ", amc_sint_arg(AC, arg2), ", ", amc_sint_arg(AC, ret_var), ");\n"]; +amc_op_call(#atomic_context{dw = true, arg1 = Arg1, ret_var = RetVar} = AC, cmpxchg) -> + [" ", RetVar, " = amc_cmpxchg(&", Arg1, "->amc, ", amc_op_dw_arg(AC), ", ", amc_op_arg_prefix(AC), Arg1, "->sint, ", amc_sint_arg(AC, arg2), ", ", amc_sint_arg(AC, arg3), ");\n"]; +amc_op_call(#atomic_context{dw = DW, arg1 = Arg1, arg2 = Arg2, arg3 = Arg3, ret_var = RetVar}, Op) -> + OpCtxt = #op_context{ret = RetVar, var = [Arg1,"->sint"], val1 = Arg2, val2 = Arg3}, + OpStr = case DW of + true -> dw_op(Op, OpCtxt); + false -> op(Op, OpCtxt) + end, + [" ETHR_AMC_MODIFICATION_OPS__(&", Arg1, "->amc, ", OpStr, ");\n"]. + +make_amc_fallback_op(#atomic_context{amc_fallback = false}, _Op, _B) -> + ""; +make_amc_fallback_op(#atomic_context{amc_fallback = true} = AC, Op, B) -> + NB = case Op of + read -> rb; + _ -> none + end, + {PreB, PostB} = xbarriers(Op, B, NB), + ["#elif defined(ETHR_AMC_FALLBACK__)\n", + case PreB of + "" -> ""; + _ -> [" ", PreB, "\n"] + end, + amc_op_call(AC, Op), + case PostB of + "" -> ""; + _ -> [" ", PostB, "\n"] + end]. + +make_locked_fallback_op(#atomic_context{dw = DW, + ret_var = RetVar, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3}, Op, B) -> + OpStr = case DW of + true -> + dw_op(Op, #op_context{ret = RetVar, + var = [Arg1, "->" ?DW_SINT_FIELD], + val1 = [Arg2, "->" ?DW_SINT_FIELD], + val2 = [Arg3, "->" ?DW_SINT_FIELD]}); + false -> + op(Op, #op_context{ret = RetVar, + var = ["*", Arg1], + val1 = Arg2, + val2 = Arg3}) + end, + {PreB, PostB} = xbarriers(Op, B, none), + ["#else\n", + case PreB of + "" -> ""; + _ -> [" ", PreB, "\n"] + end, + [" ETHR_ATOMIC_OP_FALLBACK_IMPL__(", Arg1, ", ", OpStr, ");\n"], + case PostB of + "" -> ""; + _ -> [" ", PostB, "\n"] + end, + "#endif\n"]. + +make_symbol_to_fallback_impl(#atomic_context{dw = true, + atomic = Atomic, + arg1 = Arg1, + arg2 = Arg2, + arg3 = Arg3} = AC, + Op, B) -> + [" +#ifdef ", ?DW_RTCHK_MACRO, " +", func_header(AC, implementation, false, Op, B), " +{", + case Op of + init -> ""; + _ -> ["\n ETHR_ASSERT(!ethr_not_inited__);"] + end, " + ETHR_ASSERT(", Arg1, "); + ", op_call(Op, true, "return", [Atomic, "_", opstr(Op), op_barrier_ext(B), "__"], Arg1, Arg2, Arg3, ""), " +} +#endif +" + ]; +make_symbol_to_fallback_impl(_, _, _) -> + "". + +make_symbol_implementations(#atomic_context{dw = DW, + amc_fallback = AMC, + ret_type = RetType, + addr_aint_t = AddrAintT, + ret_var = RetVar, + arg1 = Arg1} = AC) -> + FallbackVar = case DW of + true -> ["(&", Arg1, "->fallback)"]; + false -> Arg1 + end, + [" +", + case DW of + true -> [" +/* + * Double word atomics need runtime test. + */ + +int ethr_have_native_dw_atomic(void) +{ + return ethr_have_native_dw_atomic__(); +} + "]; + false -> "" + end, " + +/* --- addr() --- */ + +", func_header(AC, implementation, + case DW of + true -> ?DW_FUNC_MACRO; + false -> false + end, addr, none), " +{ + ", AddrAintT, " *", RetVar, "; + ETHR_ASSERT(!ethr_not_inited__); + ETHR_ASSERT(", Arg1, "); +", make_native_impl_op(AC, addr, none), + case AMC of + true -> ["#elif defined(ETHR_AMC_FALLBACK__) + ", RetVar ," = (", AddrAintT, " *) (", FallbackVar, ")->sint;"]; + false -> "" + end, " +#else + ", RetVar, " = (", AddrAintT, " *) ", FallbackVar, "; +#endif + return ", RetVar, "; +} +", + make_symbol_to_fallback_impl(AC, addr, none), + lists:map(fun (Op) -> + [" + +/* -- ", opstr(Op), "() -- */ + +", + lists:map(fun (B) -> + ["\n", + func_header(AC, implementation, + case DW of + true -> ?DW_FUNC_MACRO; + false -> false + end, Op, B), + "\n{\n", + case is_return_op(AC, Op) of + true -> [" ", RetType, " ", RetVar, ";\n"]; + false -> "" + end, + case Op of + init -> ""; + _ -> [" ETHR_ASSERT(!ethr_not_inited__);\n"] + end, + [" ETHR_ASSERT(", Arg1, ");\n"], + make_native_impl_op(AC, Op, B), + make_amc_fallback_op(AC#atomic_context{arg1 = FallbackVar}, Op, B), + make_locked_fallback_op(AC#atomic_context{arg1 = FallbackVar}, Op, B), + case is_return_op(AC, Op) of + true -> [" return ", RetVar, ";" + ]; + false -> + "" + end, + "\n}\n", + make_symbol_to_fallback_impl(AC, Op, B)] + end, + ?BARRIERS)] + end, + case DW of + true -> ?DW_ATOMIC_OPS; + false -> ?ATOMIC_OPS + end)]. + +make_info_functions() -> + [" + + +/* --------- Info functions --------- */ + +#if defined(", ?DW_RTCHK_MACRO, ") +char *zero_ops[] = {NULL}; +#endif +", + [lists:map(fun (NBits) -> + {DW, Bits} = case NBits of + "su_dw" -> {"su_dw_", ""}; + "dw" -> {"dw_", ""}; + _ -> {"", NBits} + end, + [" + +static char *native_", DW, "atomic", Bits, "_ops[] = {", + lists:map(fun (Op) -> + NOpStr = opstr(native(Op)), + CapNOpStr = to_upper(NOpStr), + lists:map(fun (B) -> + HaveNative = case NBits of + "dw" -> + "ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC"; + "su_dw" -> + "ETHR_HAVE_ETHR_NATIVE_SU_DW_ATOMIC"; + _ -> + [?HAVE_NATIVE_ATOMIC, NBits] + end, + NBExt = op_barrier_ext(B), + CapNBExt = to_upper(NBExt), + [" +#ifdef ", HaveNative, "_", CapNOpStr, CapNBExt, " + \"", NOpStr, NBExt, "\", +#endif" + ] + end, + ?BARRIERS) + end, + case NBits of + "dw" -> ?DW_ATOMIC_OPS; + "su_dw" -> ?DW_ATOMIC_OPS; + _ -> ?ATOMIC_OPS + end), " + NULL +}; + +char ** +ethr_native_", DW, "atomic", Bits, "_ops(void) +{ +", + case DW of + "" -> ""; + _ -> [" +#if defined(", ?DW_RTCHK_MACRO, ") + if (!", ?DW_RTCHK_MACRO, ") + return &zero_ops[0]; +#endif" + ] + end, " + return &native_", DW, "atomic", Bits, "_ops[0]; +} +" + ] + end, ["su_dw", "dw" | ?POTENTIAL_NBITS])]]. + +write_c_file(FileName) -> + {ok, FD} = file:open(FileName, [write, latin1]), + ok = file:write(FD, comments()), + ok = file:write(FD, c_top()), + lists:foreach(fun (AtomicSize) -> + ok = file:write(FD, + [atomic_implementation_comment(AtomicSize), + make_symbol_implementations(atomic_context(AtomicSize))]) + end, + ?ATOMIC_SIZES), + ok = file:write(FD, make_info_functions()). + + +main([]) -> + case os:getenv("ERL_TOP") of + false -> + io:format("$ERL_TOP not set!~n", []), + halt(1); + ErlTop -> + HFile = filename:join(ErlTop, ?H_FILE), + WHFile = fun () -> + write_h_file(HFile) + end, + CFile = filename:join(ErlTop, ?C_FILE), + WCFile = fun () -> + write_c_file(CFile) + end, + case erlang:system_info(schedulers_online) of + 1 -> + WHFile(), + WCFile(); + _ -> + {HPid, HMon} = spawn_monitor(WHFile), + {CPid, CMon} = spawn_monitor(WCFile), + receive + {'DOWN', HMon, process, HPid, HReason} -> + normal = HReason + end, + receive + {'DOWN', CMon, process, CPid, CReason} -> + normal = CReason + end + end, + io:format("Wrote: ~s~n", [HFile]), + io:format("Wrote: ~s~n", [CFile]), + init:stop() + end. + +a2l(A) -> + atom_to_list(A). + +opstr(A) -> + a2l(A). + +to_upper([]) -> + []; +to_upper([C|Cs]) when is_list(C) -> + [to_upper(C)|to_upper(Cs)]; +to_upper([C|Cs]) when is_integer(C), 97 =< C, C =< 122 -> + [C-32|to_upper(Cs)]; +to_upper([C|Cs]) -> + [C|to_upper(Cs)]. + + +comments() -> + Years = case erlang:date() of + {2011, _, _} -> "2011"; + {Y, _, _} -> "2011-"++integer_to_list(Y) + end, + ["/* + * --------------- DO NOT EDIT THIS FILE! --------------- + * This file was automatically generated by the + * \$ERL_TOP/erts/lib_src/utils/make_atomics_api script. + * If you need to make changes, edit the script and + * regenerate this file. + * --------------- DO NOT EDIT THIS FILE! --------------- + */ + +/* + * %CopyrightBegin% + * + * Copyright Ericsson AB ", Years, ". All Rights Reserved. + * + * The contents of this file are subject to the Erlang Public License, + * Version 1.1, (the \"License\"); you may not use this file except in + * compliance with the License. You should have received a copy of the + * Erlang Public License along with this software. If not, it can be + * retrieved online at http://www.erlang.org/. + * + * Software distributed under the License is distributed on an \"AS IS\" + * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See + * the License for the specific language governing rights and limitations + * under the License. + * + * %CopyrightEnd% + */ + +/* + * Description: The ethread atomics API + * Author: Rickard Green + */ + +/* + * This file maps native atomic implementations to ethread + * API atomics. If no native atomic implementation + * is available, a less efficient fallback is used instead. + * The API consists of 32-bit size, word size (pointer size), + * and double word size atomics. + * + * The following atomic operations are implemented for + * 32-bit size, and word size atomics: +", + lists:map(fun (Op) -> + [" * - ", opstr(Op), "\n"] + end, + ?ATOMIC_OPS), + " * + * The following atomic operations are implemented for + * double word size atomics: +", + lists:map(fun (Op) -> + [" * - ", opstr(Op), "\n"] + end, + ?DW_ATOMIC_OPS), + " * + * Appart from a function implementing the atomic operation + * with unspecified memory barrier semantics, there are + * functions implementing each operation with the following + * memory barrier semantics: +", + lists:map(fun (none) -> + ""; + (rb) -> + [" * - rb (read barrier)\n"]; + (wb) -> + [" * - wb (write barrier)\n"]; + (acqb) -> + [" * - acqb (acquire barrier)\n"]; + (relb) -> + [" * - relb (release barrier)\n"]; + (mb) -> + [" * - mb (full memory barrier)\n"]; + (B) -> + [" * - ", a2l(B), "\n"] + end, + ?BARRIERS), + " * + * We implement all of these operation/barrier + * combinations, regardless of whether they are useful + * or not (some of them are useless). + * + * Double word size atomic functions are on the followning + * form: + * ethr_dw_atomic_<OP>[_<BARRIER>] + * + * Word size atomic functions are on the followning + * form: + * ethr_atomic_<OP>[_<BARRIER>] + * + * 32-bit size atomic functions are on the followning + * form: + * ethr_atomic32_<OP>[_<BARRIER>] + * + * Apart from the operation/barrier functions + * described above also 'addr' functions are implemented + * which return the actual memory address used of the + * atomic variable. The 'addr' functions have no barrier + * versions. + * + * The native atomic implementation does not need to + * implement all operation/barrier combinations. + * Functions that have no native implementation will be + * constructed from existing native functionality. These + * functions will perform the wanted operation and will + * produce sufficient memory barriers, but may + * in some cases be less efficient than pure native + * versions. + * + * When we create ethread API operation/barrier functions by + * adding barriers before and after native operations it is + * assumed that: + * - A native read operation begins, and ends with a load. + * - A native set operation begins, and ends with a store. + * - An init operation begins with either a load, or a store, + * and ends with either a load, or a store. + * - All other operations begins with a load, and ends with + * either a load, or a store. + * + * This is the minimum functionality that a native + * implementation needs to provide: + * + * - Functions that need to be implemented: + * + * - ethr_native_[dw_|su_dw_]atomic[BITS]_addr + * - ethr_native_[dw_|su_dw_]atomic[BITS]_cmpxchg[_<BARRIER>] + * (at least one cmpxchg of optional barrier) + * + * - Macros that needs to be defined: + * + * A macro informing about the presence of the native + * implementation: + * + * - ETHR_HAVE_NATIVE_[DW_|SU_DW_]ATOMIC[BITS] + * + * A macro naming (a string constant) the implementation: + * + * - ETHR_NATIVE_[DW_]ATOMIC[BITS]_IMPL + * + * Each implemented native atomic function has to + * be accompanied by a defined macro on the following + * form informing about its presence: + * + * - ETHR_HAVE_ETHR_NATIVE_[DW_|SU_DW_]ATOMIC[BITS]_<OP>[_<BARRIER>] + * + * A (sparc-v9 style) membar macro: + * + * - ETHR_MEMBAR(B) + * + * Which takes a combination of the following macros + * or:ed (using |) together: + * + * - ETHR_LoadLoad + * - ETHR_LoadStore + * - ETHR_StoreLoad + * - ETHR_StoreStore + * + */ +" + ]. + +h_top() -> + [" +#undef ETHR_AMC_FALLBACK__ +#undef ETHR_AMC_NO_ATMCS__ +#undef ETHR_AMC_ATMC_T__ +#undef ETHR_AMC_ATMC_FUNC__ + +/* -- 32-bit atomics -- */ + +#undef ETHR_NAINT32_T__ +#undef ETHR_NATMC32_FUNC__ +#undef ETHR_NATMC32_ADDR_FUNC__ +#undef ETHR_NATMC32_BITS__ +#if defined(ETHR_HAVE_NATIVE_ATOMIC32) +# define ETHR_NEED_NATMC32_ADDR +# define ETHR_NATMC32_ADDR_FUNC__ ethr_native_atomic32_addr +typedef ethr_native_atomic32_t ethr_atomic32_t; +# define ETHR_NAINT32_T__ ethr_sint32_t +# define ETHR_NATMC32_FUNC__(X) ethr_native_atomic32_ ## X +# define ETHR_NATMC32_BITS__ 32 +#elif defined(ETHR_HAVE_NATIVE_ATOMIC64) +# define ETHR_NEED_NATMC64_ADDR +#ifdef ETHR_BIGENDIAN +# define ETHR_NATMC32_ADDR_FUNC__(VAR) \\ + (((ethr_sint32_t *) ethr_native_atomic64_addr((VAR))) + 1) +#else +# define ETHR_NATMC32_ADDR_FUNC__(VAR) \\ + ((ethr_sint32_t *) ethr_native_atomic64_addr((VAR))) +#endif +typedef ethr_native_atomic64_t ethr_atomic32_t; +# define ETHR_NAINT32_T__ ethr_sint64_t +# define ETHR_NATMC32_FUNC__(X) ethr_native_atomic64_ ## X +# define ETHR_NATMC32_BITS__ 64 +#else +/* + * No native atomics usable for 32-bits atomics :( + * Use fallback... + */ +typedef ethr_sint32_t ethr_atomic32_t; +#endif + +#undef ETHR_ATMC32_INLINE__ +#ifdef ETHR_NATMC32_BITS__ +# ifdef ETHR_TRY_INLINE_FUNCS +# define ETHR_ATMC32_INLINE__ +# endif +# define ETHR_HAVE_32BIT_NATIVE_ATOMIC_OPS +#endif + +#if !defined(ETHR_ATMC32_INLINE__) || defined(ETHR_ATOMIC_IMPL__) +# define ETHR_NEED_ATMC32_PROTOTYPES__ +#endif + +#ifndef ETHR_INLINE_ATMC32_FUNC_NAME_ +# define ETHR_INLINE_ATMC32_FUNC_NAME_(X) X +#endif + +#undef ETHR_ATMC32_FUNC__ +#define ETHR_ATMC32_FUNC__(X) ETHR_INLINE_ATMC32_FUNC_NAME_(ethr_atomic32_ ## X) + + +/* -- Word size atomics -- */ + +#undef ETHR_NEED_NATMC32_ADDR +#undef ETHR_NEED_NATMC64_ADDR + +#undef ETHR_NAINT_T__ +#undef ETHR_NATMC_FUNC__ +#undef ETHR_NATMC_ADDR_FUNC__ +#undef ETHR_NATMC_BITS__ +#if ETHR_SIZEOF_PTR == 8 && defined(ETHR_HAVE_NATIVE_ATOMIC64) +# ifndef ETHR_NEED_NATMC64_ADDR +# define ETHR_NEED_NATMC64_ADDR +# endif +# define ETHR_NATMC_ADDR_FUNC__ ethr_native_atomic64_addr +typedef ethr_native_atomic64_t ethr_atomic_t; +# define ETHR_NAINT_T__ ethr_sint64_t +# define ETHR_NATMC_FUNC__(X) ethr_native_atomic64_ ## X +# define ETHR_NATMC_BITS__ 64 +#elif ETHR_SIZEOF_PTR == 4 && defined(ETHR_HAVE_NATIVE_ATOMIC32) +# ifndef ETHR_NEED_NATMC64_ADDR +# define ETHR_NEED_NATMC32_ADDR +# endif +# define ETHR_NATMC_ADDR_FUNC__ ethr_native_atomic32_addr +typedef ethr_native_atomic32_t ethr_atomic_t; +# define ETHR_NAINT_T__ ethr_sint32_t +# define ETHR_NATMC_FUNC__(X) ethr_native_atomic32_ ## X +# define ETHR_NATMC_BITS__ 32 +#elif ETHR_SIZEOF_PTR == 4 && defined(ETHR_HAVE_NATIVE_ATOMIC64) +# ifndef ETHR_NEED_NATMC64_ADDR +# define ETHR_NEED_NATMC64_ADDR +# endif +#ifdef ETHR_BIGENDIAN +# define ETHR_NATMC_ADDR_FUNC__(VAR) \\ + (((ethr_sint32_t *) ethr_native_atomic64_addr((VAR))) + 1) +#else +# define ETHR_NATMC_ADDR_FUNC__(VAR) \\ + ((ethr_sint32_t *) ethr_native_atomic64_addr((VAR))) +#endif +typedef ethr_native_atomic64_t ethr_atomic_t; +# define ETHR_NATMC_T__ ethr_native_atomic64_t +# define ETHR_NAINT_T__ ethr_sint64_t +# define ETHR_NATMC_FUNC__(X) ethr_native_atomic64_ ## X +# define ETHR_NATMC_BITS__ 64 +#else +/* + * No native atomics usable for pointer size atomics :( + * Use fallback... + */ + +# if defined(ETHR_HAVE_32BIT_NATIVE_ATOMIC_OPS) +# define ETHR_AMC_FALLBACK__ +# define ETHR_AMC_NO_ATMCS__ 2 +# define ETHR_AMC_SINT_T__ ethr_sint32_t +# define ETHR_AMC_ATMC_T__ ethr_atomic32_t +# define ETHR_AMC_ATMC_FUNC__(X) ETHR_INLINE_ATMC32_FUNC_NAME_(ethr_atomic32_ ## X) +typedef struct { + ETHR_AMC_ATMC_T__ atomic[ETHR_AMC_NO_ATMCS__]; +} ethr_amc_t; +typedef struct { + ethr_amc_t amc; + ethr_sint_t sint; +} ethr_atomic_t; +# else /* locked fallback */ +typedef ethr_sint_t ethr_atomic_t; +# endif +#endif + +#undef ETHR_ATMC_INLINE__ +#ifdef ETHR_NATMC_BITS__ +# ifdef ETHR_TRY_INLINE_FUNCS +# define ETHR_ATMC_INLINE__ +# endif +# define ETHR_HAVE_WORD_SZ_NATIVE_ATOMIC_OPS +#endif + +#if !defined(ETHR_ATMC_INLINE__) || defined(ETHR_ATOMIC_IMPL__) +# define ETHR_NEED_ATMC_PROTOTYPES__ +#endif + +#ifndef ETHR_INLINE_ATMC_FUNC_NAME_ +# define ETHR_INLINE_ATMC_FUNC_NAME_(X) X +#endif + +#undef ETHR_ATMC_FUNC__ +#define ETHR_ATMC_FUNC__(X) ETHR_INLINE_ATMC_FUNC_NAME_(ethr_atomic_ ## X) + +/* -- Double word atomics -- */ + +#undef ETHR_SU_DW_NAINT_T__ +#undef ETHR_SU_DW_NATMC_FUNC__ +#undef ETHR_SU_DW_NATMC_ADDR_FUNC__ +#undef ETHR_DW_NATMC_FUNC__ +#undef ETHR_DW_NATMC_ADDR_FUNC__ +#undef ETHR_DW_NATMC_BITS__ +#if defined(ETHR_HAVE_NATIVE_DW_ATOMIC) || defined(ETHR_HAVE_NATIVE_SU_DW_ATOMIC) +# define ETHR_NEED_DW_NATMC_ADDR +# define ETHR_DW_NATMC_ADDR_FUNC__ ethr_native_dw_atomic_addr +# define ETHR_NATIVE_DW_ATOMIC_T__ ethr_native_dw_atomic_t +# define ETHR_DW_NATMC_FUNC__(X) ethr_native_dw_atomic_ ## X +# define ETHR_SU_DW_NATMC_FUNC__(X) ethr_native_su_dw_atomic_ ## X +# if ETHR_SIZEOF_PTR == 8 +# define ETHR_DW_NATMC_BITS__ 128 +# elif ETHR_SIZEOF_PTR == 4 +# define ETHR_DW_NATMC_BITS__ 64 +# else +# error \"Word size not supported\" +# endif +# ifdef ETHR_NATIVE_SU_DW_SINT_T +# define ETHR_SU_DW_NAINT_T__ ETHR_NATIVE_SU_DW_SINT_T +# endif +#elif ETHR_SIZEOF_PTR == 4 && defined(ETHR_HAVE_NATIVE_ATOMIC64) +# define ETHR_HAVE_NATIVE_SU_DW_ATOMIC +# ifndef ETHR_NEED_NATMC64_ADDR +# define ETHR_NEED_NATMC64_ADDR +# endif +# define ETHR_DW_NATMC_ADDR_FUNC__(VAR) \\ + ((ethr_dw_sint_t *) ethr_native_atomic64_addr((VAR))) +# define ETHR_NATIVE_DW_ATOMIC_T__ ethr_native_atomic64_t +# define ETHR_SU_DW_NAINT_T__ ethr_sint64_t +# define ETHR_SU_DW_NATMC_FUNC__(X) ethr_native_atomic64_ ## X +# define ETHR_DW_NATMC_BITS__ 64 +#endif + +#if defined(", ?DW_RTCHK_MACRO, ") +#define ", ?DW_FUNC_MACRO, "(X) ethr_dw_atomic_ ## X ## _fallback__ +#else +#define ", ?DW_FUNC_MACRO, "(X) ethr_dw_atomic_ ## X +#endif + +#if !defined(ETHR_DW_NATMC_BITS__) || defined(", ?DW_RTCHK_MACRO, ") +# define ETHR_NEED_DW_FALLBACK__ +#endif + +#if defined(ETHR_NEED_DW_FALLBACK__) +/* + * No native atomics usable for double word atomics :( + * Use fallback... + */ + +# ifndef ETHR_AMC_FALLBACK__ +# if ETHR_SIZEOF_PTR == 8 && defined(ETHR_HAVE_WORD_SZ_NATIVE_ATOMIC_OPS) +# define ETHR_AMC_FALLBACK__ +# define ETHR_AMC_NO_ATMCS__ 1 +# define ETHR_AMC_SINT_T__ ethr_sint_t +# define ETHR_AMC_ATMC_T__ ethr_atomic_t +# define ETHR_AMC_ATMC_FUNC__(X) ETHR_INLINE_ATMC_FUNC_NAME_(ethr_atomic_ ## X) +# elif defined(ETHR_HAVE_32BIT_NATIVE_ATOMIC_OPS) +# define ETHR_AMC_FALLBACK__ +# define ETHR_AMC_NO_ATMCS__ 2 +# define ETHR_AMC_SINT_T__ ethr_sint32_t +# define ETHR_AMC_ATMC_T__ ethr_atomic32_t +# define ETHR_AMC_ATMC_FUNC__(X) ETHR_INLINE_ATMC32_FUNC_NAME_(ethr_atomic32_ ## X) +# endif +# ifdef ETHR_AMC_FALLBACK__ +typedef struct { + ETHR_AMC_ATMC_T__ atomic[ETHR_AMC_NO_ATMCS__]; +} ethr_amc_t; +# endif +# endif + +typedef struct { +#ifdef ETHR_AMC_FALLBACK__ + ethr_amc_t amc; +#endif + ethr_sint_t sint[2]; +} ethr_dw_atomic_fallback_t; + +#endif + +typedef union { +#ifdef ETHR_NATIVE_DW_ATOMIC_T__ + ETHR_NATIVE_DW_ATOMIC_T__ native; +#endif +#ifdef ETHR_NEED_DW_FALLBACK__ + ethr_dw_atomic_fallback_t fallback; +#endif + ethr_sint_t sint[2]; +} ethr_dw_atomic_t; + +typedef union { +#ifdef ETHR_SU_DW_NAINT_T__ + ETHR_SU_DW_NAINT_T__ ", ?SU_DW_SINT_FIELD, "; +#endif + ethr_sint_t ", ?DW_SINT_FIELD, "[2]; +} ethr_dw_sint_t; + +#ifdef ETHR_BIGENDIAN +# define ETHR_DW_SINT_LOW_WORD 1 +# define ETHR_DW_SINT_HIGH_WORD 0 +#else +# define ETHR_DW_SINT_LOW_WORD 0 +# define ETHR_DW_SINT_HIGH_WORD 1 +#endif + +#undef ETHR_DW_ATMC_INLINE__ +#ifdef ETHR_DW_NATMC_BITS__ +# ifdef ETHR_TRY_INLINE_FUNCS +# define ETHR_ATMC32_INLINE__ +# endif +# define ETHR_HAVE_DOUBLE_WORD_SZ_NATIVE_ATOMIC_OPS +#endif + +#if !defined(ETHR_DW_ATMC_INLINE__) || defined(ETHR_ATOMIC_IMPL__) +# define ETHR_NEED_DW_ATMC_PROTOTYPES__ +#endif + +#ifndef ETHR_INLINE_DW_ATMC_FUNC_NAME_ +# define ETHR_INLINE_DW_ATMC_FUNC_NAME_(X) X +#endif + +#undef ETHR_DW_ATMC_FUNC__ +#define ETHR_DW_ATMC_FUNC__(X) ETHR_INLINE_DW_ATMC_FUNC_NAME_(ethr_dw_atomic_ ## X) + +#if defined(ETHR_NEED_DW_ATMC_PROTOTYPES__) +int ethr_have_native_dw_atomic(void); +#endif +#if defined(ETHR_DW_ATMC_INLINE__) || defined(ETHR_ATOMIC_IMPL__) +static ETHR_INLINE int +ETHR_INLINE_DW_ATMC_FUNC_NAME_(ethr_have_native_dw_atomic)(void) +{ +#if defined(", ?DW_RTCHK_MACRO, ") + return ", ?DW_RTCHK_MACRO, "; +#elif defined(ETHR_DW_NATMC_BITS__) + return 1; +#else + return 0; +#endif +} +#endif + +/* -- Misc -- */ + +#if defined(ETHR_TRY_INLINE_FUNCS) || defined(ETHR_ATOMIC_IMPL__) +/* + * Unusual values are used by read() fallbacks implemented via cmpxchg(). + * We want to use an unusual value in hope that it is more efficient + * not to match the value in memory. + * + * - Negative integer values are probably more unusual. + * - Very large absolute integer values are probably more unusual. + * - Odd pointers are probably more unusual (only char pointers can be odd). + */ +# define ETHR_UNUSUAL_SINT32_VAL__ ((ethr_sint32_t) 0x81818181) +# if ETHR_SIZEOF_PTR == 4 +# define ETHR_UNUSUAL_SINT_VAL__ ((ethr_sint_t) ETHR_UNUSUAL_SINT32_VAL__) +# elif ETHR_SIZEOF_PTR == 8 +# define ETHR_UNUSUAL_SINT_VAL__ ((ethr_sint_t) 0x8181818181818181L) +# else +# error \"Word size not supported\" +# endif +# if defined(ETHR_NEED_DW_NATMC_ADDR) && !defined(ETHR_HAVE_ETHR_NATIVE_DW_ATOMIC_ADDR) +# error \"No ethr_native_dw_atomic_addr() available\" +# endif +# if defined(ETHR_NEED_NATMC32_ADDR) && !defined(ETHR_HAVE_ETHR_NATIVE_ATOMIC32_ADDR) +# error \"No ethr_native_atomic32_addr() available\" +# endif +# if defined(ETHR_NEED_NATMC64_ADDR) && !defined(ETHR_HAVE_ETHR_NATIVE_ATOMIC64_ADDR) +# error \"No ethr_native_atomic64_addr() available\" +# endif +#endif + +#if defined(__GNUC__) +# ifndef ETHR_COMPILER_BARRIER +# define ETHR_COMPILER_BARRIER __asm__ __volatile__(\"\" : : : \"memory\") +# endif +#elif defined(ETHR_WIN32_THREADS) +# ifndef ETHR_COMPILER_BARRIER +# include <intrin.h> +# pragma intrinsic(_ReadWriteBarrier) +# define ETHR_COMPILER_BARRIER _ReadWriteBarrier() +# endif +#endif + +void ethr_compiler_barrier_fallback(void); +#ifndef ETHR_COMPILER_BARRIER +# define ETHR_COMPILER_BARRIER ethr_compiler_barrier_fallback() +#endif + +int ethr_init_atomics(void); + +/* info */ +char **ethr_native_atomic32_ops(void); +char **ethr_native_atomic64_ops(void); +char **ethr_native_dw_atomic_ops(void); +char **ethr_native_su_dw_atomic_ops(void); + +#if !defined(ETHR_DW_NATMC_BITS__) && !defined(ETHR_NATMC_BITS__) && !defined(ETHR_NATMC32_BITS__) +/* + * ETHR_*MEMORY_BARRIER orders between locked and atomic accesses only, + * i.e. when no native atomic implementation exist and only our lock + * based atomic fallback is used, a noop is sufficient. + */ +# undef ETHR_MEMORY_BARRIER +# undef ETHR_WRITE_MEMORY_BARRIER +# undef ETHR_READ_MEMORY_BARRIER +# undef ETHR_READ_DEPEND_MEMORY_BARRIER +# undef ETHR_MEMBAR +# define ETHR_MEMBAR(B) do { } while (0) +#endif + +#ifndef ETHR_MEMBAR +# error \"No ETHR_MEMBAR defined\" +#endif + +#define ETHR_MEMORY_BARRIER ETHR_MEMBAR(ETHR_LoadLoad|ETHR_LoadStore|ETHR_StoreLoad|ETHR_StoreStore) +#define ETHR_WRITE_MEMORY_BARRIER ETHR_MEMBAR(ETHR_StoreStore) +#define ETHR_READ_MEMORY_BARRIER ETHR_MEMBAR(ETHR_LoadLoad) +#ifdef ETHR_READ_DEPEND_MEMORY_BARRIER +# undef ETHR_ORDERED_READ_DEPEND +#else +# define ETHR_READ_DEPEND_MEMORY_BARRIER ETHR_COMPILER_BARRIER +# define ETHR_ORDERED_READ_DEPEND +#endif +"]. + +c_top() -> + [" + +#ifdef HAVE_CONFIG_H +#include \"config.h\" +#endif + +#define ETHR_TRY_INLINE_FUNCS +#define ETHR_INLINE_DW_ATMC_FUNC_NAME_(X) X ## __ +#define ETHR_INLINE_ATMC_FUNC_NAME_(X) X ## __ +#define ETHR_INLINE_ATMC32_FUNC_NAME_(X) X ## __ +#define ETHR_ATOMIC_IMPL__ + +#include \"ethread.h\" +#include \"ethr_internal.h\" + +#if (!defined(ETHR_HAVE_WORD_SZ_NATIVE_ATOMIC_OPS) \\ + || !defined(ETHR_HAVE_32BIT_NATIVE_ATOMIC_OPS)) +/* + * Spinlock based fallback for atomics used in absence of a native + * implementation. + */ + +#define ETHR_ATMC_FLLBK_ADDR_BITS ", ?ETHR_ATMC_FLLBK_ADDR_BITS, " +#define ETHR_ATMC_FLLBK_ADDR_SHIFT ", ?ETHR_ATMC_FLLBK_ADDR_SHIFT, " + +typedef struct { + union { + ethr_spinlock_t lck; + char buf[ETHR_CACHE_LINE_ALIGN_SIZE(sizeof(ethr_spinlock_t))]; + } u; +} ethr_atomic_protection_t; + +extern ethr_atomic_protection_t ethr_atomic_protection__[1 << ETHR_ATMC_FLLBK_ADDR_BITS]; + +#define ETHR_ATOMIC_PTR2LCK__(PTR) \\ +(ðr_atomic_protection__[((((ethr_uint_t) (PTR)) >> ETHR_ATMC_FLLBK_ADDR_SHIFT) \\ + & ((1 << ETHR_ATMC_FLLBK_ADDR_BITS) - 1))].u.lck) + + +#define ETHR_ATOMIC_OP_FALLBACK_IMPL__(AP, EXPS) \\ +do { \\ + ethr_spinlock_t *slp__ = ETHR_ATOMIC_PTR2LCK__((AP)); \\ + ethr_spin_lock(slp__); \\ + { EXPS; } \\ + ethr_spin_unlock(slp__); \\ +} while (0) + +ethr_atomic_protection_t ethr_atomic_protection__[1 << ETHR_ATMC_FLLBK_ADDR_BITS]; + +#endif + +", make_amc_fallback(), " + +int +ethr_init_atomics(void) +{ +#if (!defined(ETHR_HAVE_WORD_SZ_NATIVE_ATOMIC_OPS) \\ + || !defined(ETHR_HAVE_32BIT_NATIVE_ATOMIC_OPS)) + int i; + for (i = 0; i < (1 << ETHR_ATMC_FLLBK_ADDR_BITS); i++) { + int res = ethr_spinlock_init(ðr_atomic_protection__[i].u.lck); + if (res != 0) + return res; + } +#endif + return 0; +} +"]. + +make_amc_fallback() -> + [" +#if defined(ETHR_AMC_FALLBACK__) + +/* + * Fallback for large sized (word and/or double word size) atomics using + * an \"Atomic Modification Counter\" based on smaller sized native atomics. + * + * We use a 63-bit modification counter and a one bit exclusive flag. + * If 32-bit native atomics are used, we need two 32-bit native atomics. + * The exclusive flag is the least significant bit, or if multiple atomics + * are used, the least significant bit of the least significant atomic. + * + * When using the AMC fallback the following is true: + * - Reads of the same atomic variable can be done in parallel. + * - Uncontended reads doesn't cause any cache line invalidations, + * since no modifications are done. + * - Assuming that the AMC atomic(s) and the integer(s) containing the + * value of the implemented atomic resides in the same cache line, + * modifications will only cause invalidations of one cache line. + * + * When using the spinlock based fallback none of the above is true, + * however, the spinlock based fallback consumes less memory. + */ + +# if ETHR_AMC_NO_ATMCS__ != 1 && ETHR_AMC_NO_ATMCS__ != 2 +# error \"Not supported\" +# endif +# define ETHR_AMC_MAX_TRY_READ__ 10 +# ifdef ETHR_DEBUG +# define ETHR_DBG_CHK_EXCL_STATE(ASP, S) \\ +do { \\ + ETHR_AMC_SINT_T__ act = ETHR_AMC_ATMC_FUNC__(read)(&(ASP)->atomic[0]); \\ + ETHR_ASSERT(act == (S) + 1); \\ + ETHR_ASSERT(act & 1); \\ +} while (0) +# else +# define ETHR_DBG_CHK_EXCL_STATE(ASP, S) +# endif + +static ETHR_INLINE void +amc_init(ethr_amc_t *amc, int dw, ethr_sint_t *avar, ethr_sint_t *val) +{ + avar[0] = val[0]; + if (dw) + avar[1] = val[1]; +#if ETHR_AMC_NO_ATMCS__ == 2 + ETHR_AMC_ATMC_FUNC__(init)(&amc->atomic[1], 0); +#endif + ETHR_AMC_ATMC_FUNC__(init_wb)(&amc->atomic[0], 0); +} + +static ETHR_INLINE ETHR_AMC_SINT_T__ +amc_set_excl(ethr_amc_t *amc, ETHR_AMC_SINT_T__ prev_state0) +{ + ETHR_AMC_SINT_T__ state0 = prev_state0; + /* Set exclusive flag. */ + while (1) { + ETHR_AMC_SINT_T__ act_state0, new_state0; + while (state0 & 1) { /* Wait until exclusive bit has been cleared */ + ETHR_SPIN_BODY; + state0 = ETHR_AMC_ATMC_FUNC__(read)(&amc->atomic[0]); + } + /* Try to set exclusive bit */ + new_state0 = state0 + 1; + act_state0 = ETHR_AMC_ATMC_FUNC__(cmpxchg_acqb)(&amc->atomic[0], + new_state0, + state0); + if (state0 == act_state0) + return state0; /* old state0 */ + state0 = act_state0; + } +} + +static ETHR_INLINE void +amc_inc_mc_unset_excl(ethr_amc_t *amc, ETHR_AMC_SINT_T__ old_state0) +{ + ETHR_AMC_SINT_T__ state0 = old_state0; + + /* Increment modification counter and reset exclusive flag. */ + + ETHR_DBG_CHK_EXCL_STATE(amc, state0); + + state0 += 2; + + ETHR_ASSERT((state0 & 1) == 0); + +#if ETHR_AMC_NO_ATMCS__ == 2 + if (state0 == 0) { + /* + * state0 wrapped, so we need to increment state1. There is no need + * for atomic inc op, since this is always done while having exclusive + * flag. + */ + ETHR_AMC_SINT_T__ state1 = ETHR_AMC_ATMC_FUNC__(read)(&amc->atomic[1]); + state1++; + ETHR_AMC_ATMC_FUNC__(set)(&amc->atomic[1], state1); + } +#endif + ETHR_AMC_ATMC_FUNC__(set_relb)(&amc->atomic[0], state0); +} + +static ETHR_INLINE void +amc_unset_excl(ethr_amc_t *amc, ETHR_AMC_SINT_T__ old_state0) +{ + ETHR_DBG_CHK_EXCL_STATE(amc, old_state0); + /* + * Reset exclusive flag, but leave modification counter unchanged, + * i.e., restore state to what it was before setting exclusive + * flag. + */ + ETHR_AMC_ATMC_FUNC__(set_relb)(&amc->atomic[0], old_state0); +} + +static ETHR_INLINE void +amc_set(ethr_amc_t *amc, int dw, ethr_sint_t *avar, ethr_sint_t *val) +{ + ETHR_AMC_SINT_T__ state0 = ETHR_AMC_ATMC_FUNC__(read)(&amc->atomic[0]); + + state0 = amc_set_excl(amc, state0); + + avar[0] = val[0]; + if (dw) + avar[1] = val[1]; + + amc_inc_mc_unset_excl(amc, state0); +} + +static ETHR_INLINE int +amc_try_read(ethr_amc_t *amc, int dw, ethr_sint_t *avar, + ethr_sint_t *val, ETHR_AMC_SINT_T__ *state0p) +{ + /* *state0p should contain last read value if aborting */ + ETHR_AMC_SINT_T__ old_state0; +#if ETHR_AMC_NO_ATMCS__ == 2 + ETHR_AMC_SINT_T__ state1; + int abrt; +#endif + + *state0p = ETHR_AMC_ATMC_FUNC__(read_rb)(&amc->atomic[0]); + if ((*state0p) & 1) + return 0; /* exclusive flag set; abort */ +#if ETHR_AMC_NO_ATMCS__ == 2 + state1 = ETHR_AMC_ATMC_FUNC__(read_rb)(&amc->atomic[1]); +#else + ETHR_COMPILER_BARRIER; +#endif + + val[0] = avar[0]; + if (dw) + val[1] = avar[1]; + + ETHR_READ_MEMORY_BARRIER; + + /* + * Abort if state has changed (i.e, either the exclusive + * flag is set, or modification counter changed). + */ + old_state0 = *state0p; +#if ETHR_AMC_NO_ATMCS__ == 2 + *state0p = ETHR_AMC_ATMC_FUNC__(read_rb)(&amc->atomic[0]); + abrt = (old_state0 != *state0p); + abrt |= (state1 != ETHR_AMC_ATMC_FUNC__(read)(&amc->atomic[1])); + return abrt == 0; +#else + *state0p = ETHR_AMC_ATMC_FUNC__(read)(&amc->atomic[0]); + return old_state0 == *state0p; +#endif +} + +static ETHR_INLINE void +amc_read(ethr_amc_t *amc, int dw, ethr_sint_t *avar, ethr_sint_t *val) +{ + ETHR_AMC_SINT_T__ state0; + int i; + +#if ETHR_AMC_MAX_TRY_READ__ == 0 + state0 = ETHR_AMC_ATMC_FUNC__(read)(&amc->atomic[0]); +#else + for (i = 0; i < ETHR_AMC_MAX_TRY_READ__; i++) { + if (amc_try_read(amc, dw, avar, val, &state0)) + return; /* read success */ + ETHR_SPIN_BODY; + } +#endif + + state0 = amc_set_excl(amc, state0); + + val[0] = avar[0]; + if (dw) + val[1] = avar[1]; + + amc_unset_excl(amc, state0); +} + +static ETHR_INLINE int +amc_cmpxchg(ethr_amc_t *amc, int dw, ethr_sint_t *avar, + ethr_sint_t *new, ethr_sint_t *xchg) +{ + ethr_sint_t val[2]; + ETHR_AMC_SINT_T__ state0; + + if (amc_try_read(amc, dw, avar, val, &state0)) { + if (val[0] != xchg[0] || (dw && val[1] != xchg[1])) { + xchg[0] = val[0]; + if (dw) + xchg[1] = val[1]; + return 0; /* failed */ + } + /* Operation will succeed if not interrupted */ + } + + state0 = amc_set_excl(amc, state0); + + if (xchg[0] != avar[0] || (dw && xchg[1] != avar[1])) { + xchg[0] = avar[0]; + if (dw) + xchg[1] = avar[1]; + + ETHR_DBG_CHK_EXCL_STATE(amc, state0); + + amc_unset_excl(amc, state0); + return 0; /* failed */ + } + + avar[0] = new[0]; + if (dw) + avar[1] = new[1]; + + amc_inc_mc_unset_excl(amc, state0); + return 1; +} + + +#define ETHR_AMC_MODIFICATION_OPS__(AMC, OPS) \\ +do { \\ + ETHR_AMC_SINT_T__ state0__; \\ + state0__ = ETHR_AMC_ATMC_FUNC__(read)(&(AMC)->atomic[0]); \\ + state0__ = amc_set_excl((AMC), state0__); \\ + { OPS; } \\ + amc_inc_mc_unset_excl((AMC), state0__); \\ +} while (0) + +#endif /* amc fallback */ +"]. + |