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(* Copyright 2004-2013 Sascha Husa, Ian Hinder, Christiane Lechner
This file is part of Kranc.
Kranc is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Kranc is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Kranc; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
BeginPackage[
"CodeGenSymmetries`",
{"Errors`", "Helpers`", "Kranc`", "CodeGenCactus`", "MapLookup`", "CodeGenKranc`",
"CodeGenC`"}];
CreateSymmetriesRegistrationSource::usage = "";
Begin["`Private`"];
(* ------------------------------------------------------------------------
Symmetries Registration
------------------------------------------------------------------------ *)
(* Symmetries registration spec = {FullName -> "impl::GFname",
Sym -> {symX, symY, symZ}} *)
symmetriesBlock[spec_] :=
Module[{i, KrancDim},
If[!MatchQ[spec, {FullName -> _String, Sym -> {_,_,_}}],
ThrowError["symmetriesBlock: Expecting a symmetry registration spec but got ", spec]];
KrancDim = 3;
sym = lookup[spec, Sym];
{Table["sym[" <> ToString[i - 1] <> "] = " <>
ToString@sym[[i]] <> ";\n", {i, 1, KrancDim}],
"SetCartSymVN(cctkGH, sym, \"" <> lookup[spec, FullName] <> "\");\n\n"
}
];
(* syms is a list of rules mapping gridfunctions to their symmetry structures *)
calcSymmetry[gf_, syms_] :=
Module[{},
If[mapContains[syms, gf],
Return[lookup[syms,gf]],
(* FIXME: We are defaulting to scalar symmetries if no information is
available. This shouldn't happen, but I am bypassing this check
temporarily. *)
Print["WARNING: defaulting to symmetries of a scalar for "<>ToString[gf]];
Return[{1,1,1}]]];
(* This function guesses the symmetries based on component names as we
have not been given them *)
calcSymmetry[gf_] := Module[{sym, q, string},
sym = {1, 1, 1}; (* default *)
string = ToString@gf;
While[IntegerQ[q = ToExpression@StringTake[string, -1]],
Module[{},
sym[[q]] = -sym[[q]];
string = StringDrop[string, -1]
]
];
sym
];
(* Compatibility function to be called by KrancThorns because it
doesn't understand reflection symmetries *)
CreateSymmetriesRegistrationSource[thornName_, implementationName_, GFs_, debug_] :=
CreateSymmetriesRegistrationSource[thornName, implementationName, GFs, False, debug];
(* Given a symmetries registration structure as defined above, return a
C CodeGen structure of a source file which will register the symmetries. *)
CreateSymmetriesRegistrationSource[thornName_, implementationName_, GFs_, reflectionSymmetries_, debug_] :=
Module[{spec, j, lang, tmp},
If[debug,
Print["Registering Symmetries for: ", GFs];
];
lang = CodeGenC`SOURCELANGUAGE;
CodeGenC`SOURCELANGUAGE = "C";
spec = Table[{FullName -> implementationName <> "::" <> ToString@GFs[[j]],
Sym -> If[reflectionSymmetries === False,
calcSymmetry[GFs[[j]]],
calcSymmetry[GFs[[j]], Union@reflectionSymmetries]]}, {j, 1, Length@GFs}];
tmp = {FileHeader["C"],
Map[IncludeFile,
{"cctk.h", "cctk_Arguments.h", "cctk_Parameters.h", "Symmetry.h"}],
DefineCCTKFunction[ thornName <> "_RegisterSymmetries", "void",
If[Length[spec] > 0,
{CommentedBlock["array holding symmetry definitions",
"CCTK_INT sym[3];\n\n"],
CommentedBlock["Register symmetries of grid functions",
Map[symmetriesBlock, spec]]},
{}]
]
};
CodeGenC`SOURCELANGUAGE = lang;
tmp
];
End[];
EndPackage[];
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