nixpkgs/pkgs/development/compilers/yosys/default.nix

{ stdenv
, abc-verifier
, bash
, bison
, fetchFromGitHub
, flex
, libffi
, pkgconfig
, protobuf
, python3
, readline
, tcl
, verilog
, zlib
}:

# NOTE: as of late 2020, yosys has switched to an automation robot that
# automatically tags their repository Makefile with a new build number every
# day when changes are committed. please MAKE SURE that the version number in
# the 'version' field exactly matches the YOSYS_VER field in the Yosys
# makefile!
#
# if a change in yosys isn't yet available under a build number like this (i.e.
# it was very recently merged, within an hour), wait a few hours for the
# automation robot to tag the new version, like so:
#
#     https://github.com/YosysHQ/yosys/commit/71ca9a825309635511b64b3ec40e5e5e9b6ad49b
#
# note that while most nix packages for "unstable versions" use a date-based
# version scheme, synchronizing the nix package version here with the unstable
# yosys version number helps users report better bugs upstream, and is
# ultimately less confusing than using dates.

stdenv.mkDerivation rec {
  pname   = "yosys";
  version = "0.9+3675";

  src = fetchFromGitHub {
    owner  = "YosysHQ";
    repo   = "yosys";
    rev    = "71ca9a825309635511b64b3ec40e5e5e9b6ad49b";
    sha256 = "03jlhfvm5rxx8yybf94nqd3ld2y6brp8r0k6gfi56chv3iqqavy3";
  };

  enableParallelBuilding = true;
  nativeBuildInputs = [ pkgconfig ];
  buildInputs = [ tcl readline libffi python3 bison flex protobuf zlib ];

  makeFlags = [ "ENABLE_PROTOBUF=1" "PREFIX=${placeholder "out"}"];

  patchPhase = ''
    substituteInPlace ./Makefile \
      --replace 'CXX = clang' "" \
      --replace 'LD = clang++' 'LD = $(CXX)' \
      --replace 'CXX = gcc' "" \
      --replace 'LD = gcc' 'LD = $(CXX)' \
      --replace 'ABCMKARGS = CC="$(CXX)" CXX="$(CXX)"' 'ABCMKARGS =' \
      --replace 'echo UNKNOWN' 'echo ${builtins.substring 0 10 src.rev}'
    substituteInPlace ./misc/yosys-config.in \
      --replace '/bin/bash' '${bash}/bin/bash'
    patchShebangs tests
  '';

  preBuild = let
    shortAbcRev = builtins.substring 0 7 abc-verifier.rev;
  in ''
    chmod -R u+w .
    make config-${if stdenv.cc.isClang or false then "clang" else "gcc"}
    echo 'ABCEXTERNAL = ${abc-verifier}/bin/abc' >> Makefile.conf

    # we have to do this ourselves for some reason...
    (cd misc && ${protobuf}/bin/protoc --cpp_out ../backends/protobuf/ ./yosys.proto)

    if ! grep -q "ABCREV = ${shortAbcRev}" Makefile; then
      echo "ERROR: yosys isn't compatible with the provided abc (${shortAbcRev}), failing."
      exit 1
    fi

    if ! grep -q "YOSYS_VER := ${version}" Makefile; then
      echo "ERROR: yosys version in Makefile isn't equivalent to version of the nix package (${version}), failing."
      exit 1
    fi
  '';

  checkTarget = "test";
  doCheck = true;
  checkInputs = [ verilog ];

  # Internally, yosys knows to use the specified hardcoded ABCEXTERNAL binary.
  # But other tools (like mcy or symbiyosys) can't know how yosys was built, so
  # they just assume that 'yosys-abc' is available -- but it's not installed
  # when using ABCEXTERNAL
  #
  # add a symlink to fake things so that both variants work the same way. this
  # is also needed at build time for the test suite.
  postBuild   = "ln -sfv ${abc-verifier}/bin/abc ./yosys-abc";
  postInstall = "ln -sfv ${abc-verifier}/bin/abc $out/bin/yosys-abc";

  meta = with stdenv.lib; {
    description = "Open RTL synthesis framework and tools";
    homepage    = "http://www.clifford.at/yosys/";
    license     = licenses.isc;
    platforms   = platforms.all;
    maintainers = with maintainers; [ shell thoughtpolice emily ];
  };
}