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functional backend: error out if multiply driven or undriven signals are seen, dont bother putting them in functionalir

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This commit is contained in:
Emily Schmidt 2024-07-18 14:23:00 +01:00
parent 145af6f10d
commit 6d329e142d
4 changed files with 5 additions and 34 deletions
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14
kernel/functionalir.cc
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@ -56,8 +56,6 @@ const char *FunctionalIR::fn_to_string(FunctionalIR::Fn fn) {
case FunctionalIR::Fn::constant: return "constant";
case FunctionalIR::Fn::input: return "input";
case FunctionalIR::Fn::state: return "state";
case FunctionalIR::Fn::multiple: return "multiple";
case FunctionalIR::Fn::undriven: return "undriven";
case FunctionalIR::Fn::memory_read: return "memory_read";
case FunctionalIR::Fn::memory_write: return "memory_write";
}
@ -75,7 +73,6 @@ struct PrintVisitor : FunctionalIR::DefaultVisitor<std::string> {
std::string constant(Node, RTLIL::Const value) override { return "constant(" + value.as_string() + ")"; }
std::string input(Node, IdString name) override { return "input(" + name.str() + ")"; }
std::string state(Node, IdString name) override { return "state(" + name.str() + ")"; }
std::string undriven(Node, int width) override { return "undriven(" + std::to_string(width) + ")"; }
std::string default_handler(Node self) override {
std::string ret = FunctionalIR::fn_to_string(self.fn());
ret += "(";
@ -625,14 +622,11 @@ public:
factory.suggest_name(node, "$const" + std::to_string(chunk.size()) + "b" + chunk.constant().as_string());
factory.update_pending(pending, node);
} else if (chunk.is_multiple()) {
vector<Node> args;
for (auto const &driver : chunk.multiple().multiple())
args.push_back(enqueue(driver));
Node node = factory.multiple(args, chunk.size());
factory.update_pending(pending, node);
log_error("Signal %s has multiple drivers. This is not supported by the functional backend. "
"If tristate drivers are used, call tristate -formal to avoid this error.\n", log_signal(chunk));
} else if (chunk.is_none()) {
Node node = factory.undriven(chunk.size());
factory.update_pending(pending, node);
log_error("The design contains an undriven signal %s. This is not supported by the functional backend. "
"Call setundef with appropriate options to avoid this error.\n", log_signal(chunk));
} else {
log_error("unhandled drivespec: %s\n", log_signal(chunk));
log_abort();