utils/fasm/src/parameters.cpp

#include "parameters.h"
#include "vtr_assert.h"

namespace fasm {

void Parameters::AddParameter(const std::string &eblif_parameter, const std::string &fasm_feature) {
    auto ret = features_.insert(std::make_pair(eblif_parameter, FeatureParameter()));

    VTR_ASSERT(ret.second);

    ret.first->second.feature = fasm_feature;
    ret.first->second.width = FeatureWidth(fasm_feature);
}

std::string Parameters::EmitFasmFeature(const std::string &eblif_parameter, const std::string &value) {
    auto iter = features_.find(eblif_parameter);
    if(iter == features_.end()) {
        return "";
    }

    // Parameter should have exactly the expected number of bits.
    if(value.size() != iter->second.width) {
        vpr_throw(VPR_ERROR_OTHER,
                __FILE__, __LINE__, "When emitting FASM for parameter %s, expected width of %d got width of %d, value = \"%s\".",
                eblif_parameter.c_str(), iter->second.width, value.size(), value.c_str());
    }
    VTR_ASSERT(value.size() == iter->second.width);

    return vtr::string_fmt("%s=%d'b%s", iter->second.feature.c_str(),
            iter->second.width, value.c_str());
}

size_t Parameters::FeatureWidth(const std::string &feature) const {
    size_t start_of_address = feature.rfind('[');
    size_t end_of_address = feature.rfind(']');

    if(start_of_address == std::string::npos) {
        VTR_ASSERT(end_of_address == std::string::npos);
        return 1;
    }

    VTR_ASSERT(end_of_address > start_of_address+1);

    auto address = feature.substr(start_of_address+1, end_of_address - start_of_address - 1);

    size_t address_split = address.find(':');

    if(address_split == std::string::npos) {
        return 1;
    }

    VTR_ASSERT(address_split > 0);
    VTR_ASSERT(address_split+1 < address.size());

    int high_slice = vtr::atoi(address.substr(0, address_split));
    int low_slice = vtr::atoi(address.substr(address_split+1));
    VTR_ASSERT(high_slice >= low_slice);

    return high_slice - low_slice + 1;
}

} // namespace fasm