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ast: Use better parameter serialization for paramod names.

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Calling log_signal is problematic for several reasons:

- with recent changes, empty string is serialized as { }, which violates
  the "no spaces in IdString" rule
- the type (plain / real / signed / string) is dropped, wrongly conflating
  functionally different values and potentially introducing a subtle
  elaboration bug

Instead, use a custom simple serialization scheme.
This commit is contained in:
Marcelina Kościelnicka 2021-03-17 18:30:49 +01:00
parent cae905f551
commit 8740fdf1d7
2 changed files with 28 additions and 5 deletions
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27
frontends/ast/ast.cc
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@ -1575,6 +1575,29 @@ RTLIL::IdString AstModule::derive(RTLIL::Design *design, const dict<RTLIL::IdStr
return modname;
}
static std::string serialize_param_value(const RTLIL::Const &val) {
std::string res;
if (val.flags & RTLIL::ConstFlags::CONST_FLAG_STRING)
res.push_back('t');
if (val.flags & RTLIL::ConstFlags::CONST_FLAG_SIGNED)
res.push_back('s');
if (val.flags & RTLIL::ConstFlags::CONST_FLAG_REAL)
res.push_back('r');
res += stringf("%d", GetSize(val));
res.push_back('\'');
for (int i = GetSize(val) - 1; i >= 0; i--) {
switch (val.bits[i]) {
case RTLIL::State::S0: res.push_back('0'); break;
case RTLIL::State::S1: res.push_back('1'); break;
case RTLIL::State::Sx: res.push_back('x'); break;
case RTLIL::State::Sz: res.push_back('z'); break;
case RTLIL::State::Sa: res.push_back('?'); break;
case RTLIL::State::Sm: res.push_back('m'); break;
}
}
return res;
}
// create a new parametric module (when needed) and return the name of the generated module
std::string AstModule::derive_common(RTLIL::Design *design, const dict<RTLIL::IdString, RTLIL::Const> &parameters, AstNode **new_ast_out, bool quiet)
{
@ -1594,14 +1617,14 @@ std::string AstModule::derive_common(RTLIL::Design *design, const dict<RTLIL::Id
if (it != parameters.end()) {
if (!quiet)
log("Parameter %s = %s\n", child->str.c_str(), log_signal(it->second));
para_info += stringf("%s=%s", child->str.c_str(), log_signal(it->second));
para_info += stringf("%s=%s", child->str.c_str(), serialize_param_value(it->second).c_str());
continue;
}
it = parameters.find(stringf("$%d", para_counter));
if (it != parameters.end()) {
if (!quiet)
log("Parameter %d (%s) = %s\n", para_counter, child->str.c_str(), log_signal(it->second));
para_info += stringf("%s=%s", child->str.c_str(), log_signal(it->second));
para_info += stringf("%s=%s", child->str.c_str(), serialize_param_value(it->second).c_str());
continue;
}
}