Finish cfg printer prototype

target/sim/src/fixture_cheshire_soc.sv

@@ -20,13 +20,6 @@ module fixture_cheshire_soc #(
 
   `CHESHIRE_TYPEDEF_ALL(, DutCfg)
 
-  import "DPI-C" function void format_cfg(input string cfg_str, input int length);
-
-  initial begin
-    static string cfg_str = $sformatf("%p", DutCfg);
-    format_cfg(cfg_str, cfg_str.len());
-  end
-
 
   ///////////
   //  DUT  //

target/sim/src/tb_cfg_printer.sv

@@ -0,0 +1,127 @@
+module tb_cfg_printer #(
+  /// The selected simulation configuration from the `tb_cheshire_pkg`.
+  parameter int unsigned SelectedCfg = 32'd0
+);
+  import cheshire_pkg::*;
+  import tb_cheshire_pkg::*;
+  localparam cheshire_cfg_t DutCfg = TbCheshireConfigs[SelectedCfg];
+  // import "DPI-C" function void format_cfg(input string cfg_str, input int length);
+  //
+  // initial begin
+  //   static string cfg_str = $sformatf("%p", DutCfg);
+  //   format_cfg(cfg_str, cfg_str.len());
+  // end
+
+
+  initial begin
+    // constants
+    static int unsigned int_hex_split    = 4096;
+    static int unsigned param_name_width = 24;
+
+    // get the string
+    static string cfg_str  = $sformatf("%p", DutCfg);
+    static integer cfg_len = cfg_str.len();
+
+    // temp variables
+    static string       cfg_item      = "";
+    static bit          array_active  = 0;
+    static bit          unnamed_array = 0;
+    static bit          was_closed    = 0;
+    static int unsigned unnamed_idx   = 0;
+
+    // terminate config string
+    cfg_str.putc(cfg_len-1, ",");
+
+    // parse each character individually
+    for (int i = 2; i < cfg_len; i++) begin
+
+      // colon
+      if (cfg_str[i] == ":") begin
+        // we print a key
+        automatic string padding = "";
+
+        // decide if we are in array mode
+        if (array_active) begin
+          for (int p = 0; p < param_name_width - cfg_item.len() - 4; p++) begin
+            padding = {padding, " "};
+          end
+          $write("    %s:%s", cfg_item, padding);
+        end else begin
+          for (int p = 0; p < param_name_width - cfg_item.len(); p++) begin
+            padding = {padding, " "};
+          end
+          $write("%s:%s", cfg_item, padding);
+        end
+        cfg_item = "";
+
+        // differentiate between unnamed and named arrays
+        if (array_active) begin
+          unnamed_array = 0;
+        end
+
+      // comma
+      end else if (cfg_str[i] == ",") begin
+        automatic longint unsigned value = cfg_item.atoi();
+        automatic string unnamed_idx_str = $sformatf("%-0d", unnamed_idx);
+        automatic string padding         = "";
+
+        // we print the unnamed array index
+        if (array_active & unnamed_array) begin
+          for (int p = 0; p < param_name_width - unnamed_idx_str.len() - 4; p++) begin
+            padding = {padding, " "};
+          end
+          $write("    %s:%s", unnamed_idx_str, padding);
+        end
+
+        // we print a value
+        if (value < int_hex_split) begin
+          $write(" %d", value);
+        end else begin
+          automatic string hex_val = $sformatf("%h", value);
+          $write("0x");
+          for (int h = 0; h < hex_val.len(); h++) begin
+            if (h % 4 == 0 && h > 0) begin
+              $write("_");
+            end
+            $write("%s", hex_val[h]);
+          end
+        end
+        cfg_item = "";
+
+        // array bookkeeping
+        unnamed_idx = unnamed_idx + 1;
+        if (was_closed) begin
+          was_closed   = 0;
+          array_active = 0;
+        end
+
+        // finish entry
+        $write("\n");
+
+      // space: ignore
+      end else if (cfg_str[i] == " ") begin
+        continue;
+
+      // ': ignore
+      end else if (cfg_str[i] == "'") begin
+        continue;
+
+      // }: ignore
+      end else if (cfg_str[i] == "}") begin
+        was_closed = 1;
+
+      // {: begin array
+      end else if (cfg_str[i] == "{") begin
+        array_active  = 1;
+        unnamed_array = 1;
+        unnamed_idx   = 0;
+        $write("\n");
+
+      // append key or value
+      end else begin
+        cfg_item = {cfg_item, cfg_str[i]};
+      end
+    end
+  end
+
+endmodule