dft: implementing scan_opt placeholder command

This will allo us to add this to current openroad flows so we don't have
to update them later

Signed-off-by: Felipe Garay <fgaray@google.com>

Author: fgaray

src/dft/include/dft/Dft.hh

@@ -86,6 +86,9 @@ class Dft
   // Prints to stdout
   void reportDftConfig() const;
 
+  // Performs scan optimizations on the netlist
+  void scanOpt();
+
  private:
   // If we need to run pre_dft to create the internal state
   bool need_to_run_pre_dft_;

src/dft/src/Dft.cpp

@@ -177,4 +177,8 @@ std::vector<std::unique_ptr<ScanChain>> Dft::scanArchitect()
   return scan_architect->getScanChains();
 }
 
+void Dft::scanOpt() {
+  logger_->warn(utl::DFT, 14, "Scan Opt is not currently implemented");
+}
+
 }  // namespace dft

src/dft/src/dft.i

@@ -119,4 +119,9 @@ void report_dft_config() {
   getDft()->reportDftConfig();
 }
 
+void scan_opt()
+{
+  getDft()->scanOpt();
+}
+
 %}  // inline

src/dft/src/dft.tcl

@@ -96,3 +96,15 @@ proc report_dft_config { args } {
   sta::parse_key_args "report_dft_config" args keys {} flags {}
   dft::report_dft_config
 }
+
+
+sta::define_cmd_args "scan_opt" { }
+proc scan_opt { args } {
+  sta::parse_key_args "scan_opt" args \
+    keys {} flags {}
+
+  if { [ord::get_db_block] == "NULL" } {
+    utl::error DFT 13 "No design block found."
+  }
+  dft::scan_opt
+}