Added "write_blif -blackbox"

based on code by Eddie Hung from
https://github.com/eddiehung/yosys/commit/1e481661cb4a4

diff --git a/backends/blif/blif.cc b/backends/blif/blif.cc
index 18f76f7e473a8ae93b1f3dc37e24c9b0388df3d8..fa5f7bca23382c0d000ad2af50a7613cece46db1 100644 (file)
--- a/backends/blif/blif.cc
+++ b/backends/blif/blif.cc
@@ -38,12 +38,13 @@ struct BlifDumperConfig
        bool impltf_mode;
        bool gates_mode;
        bool param_mode;
+       bool blackbox_mode;
 
        std::string buf_type, buf_in, buf_out;
        std::map<RTLIL::IdString, std::pair<RTLIL::IdString, RTLIL::IdString>> unbuf_types;
        std::string true_type, true_out, false_type, false_out;
 
-       BlifDumperConfig() : icells_mode(false), conn_mode(false), impltf_mode(false), gates_mode(false), param_mode(false) { }
+       BlifDumperConfig() : icells_mode(false), conn_mode(false), impltf_mode(false), gates_mode(false), param_mode(false), blackbox_mode(false) { }
 };
 
 struct BlifDumper
@@ -130,6 +131,12 @@ struct BlifDumper
                }
                f << stringf("\n");
 
+               if (module->get_bool_attribute("\\blackbox")) {
+                       f << stringf(".blackbox\n");
+                       f << stringf(".end\n");
+                       return;
+               }
+
                if (!config->impltf_mode) {
                        if (!config->false_type.empty())
                                f << stringf(".%s %s %s=$false\n", subckt_or_gate(config->false_type),
@@ -314,6 +321,9 @@ struct BlifBackend : public Backend {
                log("    -param\n");
                log("        use the non-standard .param statement to write module parameters\n");
                log("\n");
+               log("    -blackbox\n");
+               log("        write blackbox cells with .blackbox statement.\n");
+               log("\n");
                log("    -impltf\n");
                log("        do not write definitions for the $true and $false wires.\n");
                log("\n");
@@ -374,6 +384,10 @@ struct BlifBackend : public Backend {
                                config.param_mode = true;
                                continue;
                        }
+                       if (args[argidx] == "-blackbox") {
+                               config.blackbox_mode = true;
+                               continue;
+                       }
                        if (args[argidx] == "-impltf") {
                                config.impltf_mode = true;
                                continue;
@@ -394,7 +408,7 @@ struct BlifBackend : public Backend {
                for (auto module_it : design->modules_)
                {
                        RTLIL::Module *module = module_it.second;
-                       if (module->get_bool_attribute("\\blackbox"))
+                       if (module->get_bool_attribute("\\blackbox") && !config.blackbox_mode)
                                continue;
 
                        if (module->processes.size() != 0)