Added "port_directions" to write_json output

diff --git a/backends/json/json.cc b/backends/json/json.cc
index 7d73fb11df8aa855c8a3197ab4abfe68646a6c1e..648b793cf1d2b22f6c000abaf744bee05b871f95 100644 (file)
--- a/backends/json/json.cc
+++ b/backends/json/json.cc
@@ -137,6 +137,19 @@ struct JsonWriter
                        f << stringf("          \"attributes\": {");
                        write_parameters(c->attributes);
                        f << stringf("\n          },\n");
+                       if (c->known()) {
+                               f << stringf("          \"port_directions\": {");
+                               bool first2 = true;
+                               for (auto &conn : c->connections()) {
+                                       string direction = "output";
+                                       if (c->input(conn.first))
+                                               direction = c->output(conn.first) ? "inout" : "input";
+                                       f << stringf("%s\n", first2 ? "" : ",");
+                                       f << stringf("            %s: \"%s\"", get_name(conn.first).c_str(), direction.c_str());
+                                       first2 = false;
+                               }
+                               f << stringf("\n          },\n");
+                       }
                        f << stringf("          \"connections\": {");
                        bool first2 = true;
                        for (auto &conn : c->connections()) {
@@ -240,6 +253,10 @@ struct JsonBackend : public Backend {
                log("        <attribute_name>: <attribute_value>,\n");
                log("        ...\n");
                log("      },\n");
+               log("      \"port_directions\": {\n");
+               log("        <port_name>: <\"input\" | \"output\" | \"inout\">,\n");
+               log("        ...\n");
+               log("      },\n");
                log("      \"connections\": {\n");
                log("        <port_name>: <bit_vector>,\n");
                log("        ...\n");
@@ -256,6 +273,9 @@ struct JsonBackend : public Backend {
                log("The \"hide_name\" fields are set to 1 when the name of this cell or net is\n");
                log("automatically created and is likely not of interest for a regular user.\n");
                log("\n");
+               log("The \"port_directions\" section is only included for cells for which the\n");
+               log("interface is known.\n");
+               log("\n");
                log("Module and cell ports and nets can be single bit wide or vectors of multiple\n");
                log("bits. Each individual signal bit is assigned a unique integer. The <bit_vector>\n");
                log("values referenced above are vectors of this integers. Signal bits that are\n");