open_synth: make it work with OpenSTA

Modify scripts so that make open_synth can work with OpenSTA, this simplifies reporting issues. Turnaround times on real test cases is long, so it is nice to have this debugged in ORFS.

To examine timing of a design using OpenSTA:

    make OPENROAD_EXE=../tools/install/OpenROAD/bin/sta open_synth

To create an OpenSTA standalone issue, run:

    make open_issue

Tinker with run-*.sh script, create a small script, source scripts/sta-synth.tcl and create test-case.

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/scripts/load.tcl

@@ -6,14 +6,18 @@ proc load_design {design_file sdc_file} {
   # Read liberty files
   source $::env(SCRIPTS_DIR)/read_liberty.tcl
 
+  # OpenSTA does not have read_lef
+  set got_lef [expr [llength [info commands read_lef]] > 0]
   # Read design files
   set ext [file extension $design_file]
   if {$ext == ".v"} {
-    read_lef $::env(TECH_LEF)
-    read_lef $::env(SC_LEF)
-    if {[env_var_exists_and_non_empty ADDITIONAL_LEFS]} {
-      foreach lef $::env(ADDITIONAL_LEFS) {
-        read_lef $lef
+    if {$got_lef} {
+      read_lef $::env(TECH_LEF)
+      read_lef $::env(SC_LEF)
+      if {[env_var_exists_and_non_empty ADDITIONAL_LEFS]} {
+        foreach lef $::env(ADDITIONAL_LEFS) {
+          read_lef $lef
+        }
       }
     }
     read_verilog $::env(RESULTS_DIR)/$design_file
@@ -24,9 +28,12 @@ proc load_design {design_file sdc_file} {
     error "Unrecognized input file $design_file"
   }
 
-  # Read SDC file
   read_sdc $::env(RESULTS_DIR)/$sdc_file
 
+  if {!$got_lef} {
+    return
+  }
+
   if [file exists $::env(PLATFORM_DIR)/derate.tcl] {
     log_cmd source $::env(PLATFORM_DIR)/derate.tcl
   }

flow/scripts/read_liberty.tcl

@@ -1,3 +1,12 @@
+if {![expr [llength [info commands read_lef]] > 0]} {
+  proc suppress_message {a b} {
+    # not used in OpenSTA
+  }
+  proc unsuppress_message {a b} {
+    # not used in OpenSTA
+  }
+}
+
 # To remove [WARNING STA-1212] from the logs for ASAP7.
 # /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13178, timing group from output port.
 # Added following suppress_message

flow/scripts/sta-synth.tcl

@@ -1,2 +1,14 @@
 source $::env(SCRIPTS_DIR)/load.tcl
 load_design 1_synth.v 1_synth.sdc
+
+if {[env_var_equals GUI_TIMING 1]} {
+  puts "GUI_TIMING=1 reading timing, takes a little while for large designs..."
+  set openroad [expr [llength [info commands ord::openroad_version]] > 0]
+
+  if {$openroad && [gui::enabled]} {
+    gui::select_chart "Endpoint Slack"
+    log_cmd gui::update_timing_report
+  } else {
+    report_checks
+  }
+}