Allow preempt LVS configuration

same_nets, equivalent_pins, same_circuits and same_device_classes
can now be given at the beginning of the LVS script. This will
simplify building universal scripts with the run specific part at
the beginning (one "load" section).

The price are somewhat less specific error messages when something
fails in these methods.

testdata/lvs/ringo_layout_var.lvs

@@ -5,6 +5,10 @@ report_lvs($lvs_test_target_lvsdb, true)
 
 target_netlist($lvs_test_target_cir, write_spice, "Extracted by KLayout")
 
+# both INVX1 and INVX1B are the same schematic cell
+same_circuits("INVX1", "INVX1")
+same_circuits("INVX1B", "INVX1")
+
 schematic("ringo.cir")
 
 deep
@@ -70,9 +74,5 @@ connect_global(ptie, "SUBSTRATE")
 
 netlist.simplify
 
-# both INVX1 and INVX1B are the same schematic cell
-same_circuits("INVX1", "INVX1")
-same_circuits("INVX1B", "INVX1")
-
 compare
 

testdata/lvs/ringo_simple_net_and_circuit_equivalence.lvs

@@ -7,6 +7,9 @@ target_netlist($lvs_test_target_cir, write_spice, "Extracted by KLayout")
 
 schematic("ringo.cir")
 
+# preempt configuration (see below)
+same_nets("top", "ENABLE", "RINGO", "ENABLE")
+
 deep
 
 # Drawing layers
@@ -71,7 +74,6 @@ connect_global(ptie, "SUBSTRATE")
 same_circuits("top", "RINGO")
 same_circuits("INV", "INVX1")
 same_circuits("DOESNOTEXIST", "DOESNOTEXIST2")
-same_nets("top", "ENABLE", "RINGO", "ENABLE")
 same_nets("DOESNOTEXIST", "ENABLE", "DOESNOTEXIST2", "ENABLE")
 
 netlist.simplify

testdata/lvs/ringo_simple_pin_swapping.lvs

@@ -7,6 +7,9 @@ target_netlist($lvs_test_target_cir, write_spice, "Extracted by KLayout")
 
 schematic("ringo_pin_swapping.cir")
 
+# preempt configuration
+equivalent_pins("ND2X1", 4, 5)
+
 deep
 
 # Drawing layers
@@ -68,7 +71,6 @@ connect_global(ptie, "SUBSTRATE")
 
 # Compare section
 
-equivalent_pins("ND2X1", 4, 5)
 equivalent_pins("DOESNOTEXIST", 4, 5)
 
 netlist.simplify

testdata/lvs/ringo_simple_same_device_classes.lvs

@@ -8,6 +8,9 @@ target_netlist($lvs_test_target_cir, writer, "Extracted by KLayout")
 
 schematic("ringo.cir")
 
+# preempt configuration
+same_device_classes("PM", "PMOS")
+
 deep
 
 # Drawing layers
@@ -90,7 +93,6 @@ connect_global(ptie, "SUBSTRATE")
 
 netlist.simplify
 
-same_device_classes("PM", "PMOS")
 same_device_classes("NM", "NMOS")
 same_device_classes("PMHV", "PMOSHV")
 same_device_classes("NMHV", "NMOSHV")