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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`", "CodeGen`"}];
CreateSymmetriesRegistrationSource::usage = "";
Begin["`Private`"];
(* ------------------------------------------------------------------------
Symmetries Registration
------------------------------------------------------------------------ *)
(* Symmetries registration spec = {FullName -> "impl::GFname",
Sym -> {symX, symY, symZ}} *)
DefFn[symmetriesBlock[spec_] :=
Module[
{i, dim},
If[!MatchQ[spec, {FullName -> _String, Sym -> {_,_,_}}],
ThrowError["symmetriesBlock: Expecting a symmetry registration spec but got ", spec]];
sym = lookup[spec, Sym];
dim = Length[sym];
{Table[{"sym[", i - 1, "] = ", sym[[i]], ";\n"}, {i, 1, dim}],
"SetCartSymVN(cctkGH, sym, ", Quote[lookup[spec, FullName]], ");\n\n"}]];
(* syms is a list of rules mapping gridfunctions to their symmetry structures *)
DefFn[
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 *)
DefFn[
calcSymmetry[gf_] :=
Module[
{sym = {1,1,1} (* default *), q, string},
string = ToString@gf;
While[
IntegerQ[q = ToExpression@StringTake[string, -1]],
sym[[q]] = -sym[[q]];
string = StringDrop[string, -1]];
sym]];
(* Given a symmetries registration structure as defined above, return a
C CodeGen structure of a source file which will register the symmetries. *)
DefFn[
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 = Map[{FullName -> implementationName <> "::" <> ToString@#,
Sym -> If[reflectionSymmetries === False,
calcSymmetry[#],
calcSymmetry[#, Union@reflectionSymmetries]]} &,
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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