Add final check all drivers have parasitic annotation

flow/scripts/final_report.tcl

@@ -53,6 +53,9 @@ if {
   } else {
     puts "IR drop analysis for ground nets is skipped because GND_NETS_VOLTAGES is undefined"
   }
+
+  # Check all drivers have parasitic annotation with exception of those with no connected loads
+  check_parasitic_annotation
 } else {
   puts "OpenRCX is not enabled for this platform."
   puts "Falling back to global route-based estimates."

flow/scripts/util.tcl

@@ -290,3 +290,34 @@ proc orfs_write_sdc { output_file } {
   }
   log_cmd write_sdc -no_timestamp $output_file
 }
+
+proc check_parasitic_annotation { } {
+  foreach scene [sta::scenes] {
+    set nmissing 0
+    set example "NULL"
+    foreach pin [get_pins *] {
+      if { [$pin is_leaf] && [$pin is_driver] } {
+        if { ![sta::parasitics_annotated $pin $scene] } {
+          set has_loads false
+          set pin_iter [$pin connected_pin_iterator]
+          while { [$pin_iter has_next] } {
+            set other_pin [$pin_iter next]
+            if { [$other_pin is_leaf] && [$other_pin is_load] && $other_pin != $pin } {
+              set has_loads true
+              break
+            }
+          }
+          $pin_iter finish
+          if { $has_loads } {
+            set nmissing [expr $nmissing + 1]
+            set example $pin
+          }
+        }
+      }
+    }
+    if { $nmissing > 0 } {
+      error "Missing parasitic annotation in scene $scene on $nmissing \
+             driver pins, for example [get_full_name $example]"
+    }
+  }
+}