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[nix] use vcs rtlink in all cases #978

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Feb 25, 2025
Merged

[nix] use vcs rtlink in all cases #978

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4 changes: 4 additions & 0 deletions nix/t1/conversion/sv-to-vcs-simulator.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,10 @@
assert lib.assertMsg (builtins.typeOf vsrc == "list") "vsrc should be a list of file path";
assert lib.assertMsg (builtins.typeOf vcsLinkLibs == "list") "vcsLinkLibs should be list of strings";

# Technically we could static link some libs and rtlink others,
# but currently we don't use it in such a way, so just assert it to catch error
assert lib.assertMsg (vcsLinkLibs != [] -> rtLinkDpiLib) "vcsLinkLibs and rtLinkDpiLib are both set";

let
# VCS simulation profiling
# This is a debug feature, thus intentionally not exposed
Expand Down
5 changes: 2 additions & 3 deletions nix/t1/run/default.nix
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Expand Up @@ -5,7 +5,6 @@
, verilator-emu
, verilator-emu-trace
, vcs-emu
, vcs-emu-rtlink
, vcs-emu-cover
, vcs-emu-trace
, vcs-dpi-lib
Expand Down Expand Up @@ -44,7 +43,7 @@ let

vcs-emu = runEmu {
inherit testCase;
emulator = vcs-emu-rtlink;
emulator = vcs-emu;
};

vcs-emu-trace = runEmu {
Expand Down Expand Up @@ -73,7 +72,7 @@ let

vcs-prof-vcd = runFsdb2vcd (runEmu {
inherit testCase;
emulator = vcs-emu-rtlink;
emulator = vcs-emu;
emuExtraArgs = {
vcsDpiLib = vcs-dpi-lib;
};
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14 changes: 8 additions & 6 deletions nix/t1/t1.nix
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Expand Up @@ -140,17 +140,19 @@ forEachTop (topName: generator: self: {

inherit (t1Scope) sim-checker;

# We do not use vcs-emu-static every day,
# but we may switch back to static once rtLink breaks
vcs-emu-static = self.vcs-emu.override {
mainProgram = "${topName}-vcs-simulator-static";
vcsLinkLibs = [ "${self.vcs-dpi-lib}/lib/libdpi_${topName}.a" ];
rtLinkDpiLib = null;
};

vcs-emu = t1Scope.sv-to-vcs-simulator {
mainProgram = "${topName}-vcs-simulator";
topModule = "TestBench";
rtl = self.rtl;
vsrc = lib.filesystem.listFilesRecursive self.clean-vsrc.outPath;
vcsLinkLibs = [ "${self.vcs-dpi-lib}/lib/libdpi_${topName}.a" ];
rtLinkDpiLib = self.vcs-dpi-lib;
};
vcs-emu-rtlink = self.vcs-emu.override {
mainProgram = "${topName}-vcs-simulator-rtlink";
vcsLinkLibs = [ ];
rtLinkDpiLib = self.vcs-dpi-lib;
};
vcs-emu-cover = self.vcs-emu.override {
Expand Down
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