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json: Group bus ports in backend

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-08-07 14:47:01 +01:00
parent e55946bec7
commit b8455f20e2
1 changed files with 59 additions and 5 deletions
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64
json/jsonwrite.cc
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@ -66,6 +66,59 @@ void write_parameters(std::ostream &f, Context *ctx, const std::unordered_map<Id
}
}
struct PortGroup
{
std::string name;
std::vector<int> bits;
PortType dir;
};
std::vector<PortGroup> group_ports(Context *ctx)
{
std::vector<PortGroup> groups;
std::unordered_map<std::string, size_t> base_to_group;
for (auto &pair : ctx->ports) {
std::string name = pair.second.name.str(ctx);
if ((name.back() != ']') || (name.find('[') == std::string::npos)) {
groups.push_back({name, {pair.first.index}, pair.second.type});
} else {
int off1 = int(name.find_last_of('['));
std::string basename = name.substr(0, off1);
int index = std::stoi(name.substr(off1 + 1, name.size() - (off1 + 2)));
if (!base_to_group.count(basename)) {
base_to_group[basename] = groups.size();
groups.push_back({basename, std::vector<int>(index + 1, -1), pair.second.type});
}
auto &grp = groups.at(base_to_group[basename]);
if (int(grp.bits.size()) <= index)
grp.bits.resize(index + 1, -1);
NPNR_ASSERT(grp.bits.at(index) == -1);
grp.bits.at(index) = pair.first.index;
}
}
return groups;
};
std::string format_port_bits(const PortGroup &port)
{
std::stringstream s;
s << "[ ";
bool first = true;
for (auto bit : port.bits) {
if (!first)
s << ", ";
if (bit == -1)
s << "\"x\"";
else
s << bit;
first = false;
}
s << " ]";
return s.str();
}
void write_module(std::ostream &f, Context *ctx)
{
auto val = ctx->attrs.find(ctx->id("module"));
@ -80,14 +133,15 @@ void write_module(std::ostream &f, Context *ctx)
write_parameters(f, ctx, ctx->attrs, true);
f << stringf("\n },\n");
f << stringf(" \"ports\": {");
auto ports = group_ports(ctx);
bool first = true;
for (auto &pair : ctx->ports) {
auto &c = pair.second;
for (auto &port : ports) {
f << stringf("%s\n", first ? "" : ",");
f << stringf(" %s: {\n", get_name(c.name, ctx).c_str());
f << stringf(" %s: {\n", get_string(port.name).c_str());
f << stringf(" \"direction\": \"%s\",\n",
c.type == PORT_IN ? "input" : c.type == PORT_INOUT ? "inout" : "output");
f << stringf(" \"bits\": [ %d ]\n", pair.first.index);
port.dir == PORT_IN ? "input" : port.dir == PORT_INOUT ? "inout" : "output");
f << stringf(" \"bits\": %s\n", format_port_bits(port).c_str());
f << stringf(" }");
first = false;
}