Integrate KLayout DRC for sky130 (#2059)

~ Bump open_pdks version to `cd1748bb197f9b7af62a54507de6624e30363943`
~ Rename `PRIMARY_SIGNOFF_TOOL` to `PRIMARY_GDSII_STREAMOUT_TOOL`
~ Update documentation of `RUN_MAGIC_DRC` and `RUN_KLAYOUT_DRC`
+ Integrate KLayout DRC for sky130
+ Add the following variables:
```
KLAYOUT_DRC_THREADS
QUIT_ON_KLAYOUT_DRC
RUN_KLAYOUT_DRC
KLAYOUT_DRC_RUNSET - PDK variable
KLAYOUT_DRC_OPTIONS - PDK variable
```
- Remove `KLAYOUT_DRC_KLAYOUT_GDS`

configuration/checkers.tcl

@@ -41,3 +41,4 @@ set ::env(QUIT_ON_LVS_ERROR) 1
 
 # Klayout
 set ::env(QUIT_ON_XOR_ERROR) 1
+set ::env(QUIT_ON_KLAYOUT_DRC) 1

configuration/general.tcl

@@ -41,7 +41,7 @@ set ::env(RUN_IRDROP_REPORT) 1
 
 ## Signoff
 set ::env(RUN_CVC) 1
-set ::env(PRIMARY_SIGNOFF_TOOL) magic
+set ::env(PRIMARY_GDSII_STREAMOUT_TOOL) magic
 
 ### Netgen
 set ::env(RUN_LVS) 1
@@ -70,7 +70,8 @@ set ::env(MAGIC_GDS_POLYGON_SUBCELLS) 0
 
 ### Klayout-Specific
 set ::env(RUN_KLAYOUT) 1
-set ::env(RUN_KLAYOUT_DRC) 0
+set ::env(RUN_KLAYOUT_DRC) 1
+set ::env(KLAYOUT_DRC_THREADS) 1
 set ::env(KLAYOUT_XOR_THREADS) 1
 set ::env(KLAYOUT_XOR_IGNORE_LAYERS) ""
 set ::env(TAKE_LAYOUT_SCROT) 0

dependencies/tool_metadata.yml

@@ -64,6 +64,6 @@
   in_install: false
 - name: open_pdks
   repo: https://github.com/RTimothyEdwards/open_pdks
-  commit: e0f692f46654d6c7c99fc70a0c94a080dab53571
+  commit: cd1748bb197f9b7af62a54507de6624e30363943
   in_install: false
   pdk: true

docker/openlane/Dockerfile.tpl

@@ -23,6 +23,7 @@ ENV OPENROAD_BIN openroad
 
 ENV OPENROAD=/build/
 ENV PATH=$OPENLANE_ROOT:$OPENLANE_ROOT/scripts:$OPENROAD/bin:$OPENROAD/bin/Linux-x86_64:$OPENROAD/pdn/scripts:$PATH
+ENV PYTHONPATH=$PYTHONPATH:/build/lib/python3/dist-packages
 ENV LD_LIBRARY_PATH=$OPENROAD/lib:$OPENROAD/lib/Linux-x86_64:$LD_LIBRARY_PATH
 ENV MANPATH=$OPENROAD/share/man:$MANPATH
 ENV PDK_ROOT /build/pdk

docs/source/reference/configuration.md

@@ -321,7 +321,7 @@ These variables worked initially, but they were too sky130 specific and will be
 
 |Variable|Description|
 |-|-|
-| `PRIMARY_SIGNOFF_TOOL` <a id="PRIMARY_SIGNOFF_TOOL"></a> | Determines whether `magic` or `klayout` is the primary signoff tool. <br> (Default: `magic`) |
+| `PRIMARY_GDSII_STREAMOUT_TOOL` <a id="PRIMARY_GDSII_STREAMOUT_TOOL"></a> | Determines whether `magic` or `klayout` is the primary signoff tool. <br> (Default: `magic`) |
 | `USE_ARC_ANTENNA_CHECK` <a id="USE_ARC_ANTENNA_CHECK"></a> | Specifies whether to use the openroad ARC antenna checker or magic antenna checker. 0=magic antenna checker, 1=ARC OR antenna checker <br> (Default: `1`)
 | `RUN_CVC` <a id="RUN_CVC"></a> | Runs CVC on the output spice, which is a Circuit Validity Checker. Voltage aware ERC checker for CDL netlists. 1 = Enabled, 0 = Disabled. <br> (Default: `1`) |
 | `SIGNOFF_SDC_FILE` <a id="SIGNOFF_SDC_FILE"></a> | Specifies SDC file used by multicorner STA during signoff stage, which can be different from the one used for implementation. <br> (Default: `BASE_SDC_FILE`) |
@@ -330,7 +330,7 @@ These variables worked initially, but they were too sky130 specific and will be
 |Variable|Description|
 |-|-|
 | `RUN_MAGIC` <a id="RUN_MAGIC"></a> | Enables running magic and GDSII streaming. 1 = Enabled, 0 = Disabled <br> (Default: `1`)|
-| `RUN_MAGIC_DRC` <a id="RUN_MAGIC_DRC"></a> | Enables running magic DRC on GDSII produced by magic. 1 = Enabled, 0 = Disabled <br> (Default: `1`)|
+| `RUN_MAGIC_DRC` <a id="RUN_MAGIC_DRC"></a> | Enables running magic DRC on either GDSII produced by `PRIMARY_GDSII_STREAMOUT_TOOL` or final produced DEF file depending on `MAGIC_DRC_USE_GDS`. 1 = Enabled, 0 = Disabled <br> (Default: `1`)|
 | `MAGIC_PAD` <a id="MAGIC_PAD"></a> |  A flag to pad the views generated by magic (.mag, .lef, .gds) with one site. 1 = Enabled, 0 = Disabled <br> (Default: `0`)|
 | `MAGIC_ZEROIZE_ORIGIN` <a id="MAGIC_ZEROIZE_ORIGIN"></a> | A flag to move the layout such that it's origin in the lef generated by magic is 0,0. 1 = Enabled, 0 = Disabled  <br> (Default: `1`)|
 | `MAGIC_GENERATE_GDS` <a id="MAGIC_GENERATE_GDS"></a> | A flag to generate gds view via magic. 1 = Enabled, 0 = Disabled  <br> (Default: `1`)|
@@ -355,9 +355,10 @@ These variables worked initially, but they were too sky130 specific and will be
 |-|-|
 | `RUN_KLAYOUT` <a id="RUN_KLAYOUT"></a> | Enables running KLayout and GDSII streaming. 1 = Enabled, 0 = Disabled <br> (Default: `1`)|
 | `RUN_KLAYOUT_XOR` <a id="RUN_KLAYOUT_XOR"></a> | Enables running KLayout XOR on 2 GDSIIs, the defaults are the one produced by magic vs the one produced by klayout. 1 = Enabled, 0 = Disabled <br> (Default: `1`)|
-| `RUN_KLAYOUT_DRC` <a id="RUN_KLAYOUT_DRC"></a> | Enables running KLayout DRC on GDSII produced by magic. 1 = Enabled, 0 = Disabled <br> (Default: `0`)|
+| `RUN_KLAYOUT_DRC` <a id="RUN_KLAYOUT_DRC"></a> | Enables running KLayout DRC on GDSII produced by `PRIMARY_GDSII_STREAMOUT_TOOL`. 1 = Enabled, 0 = Disabled <br> (Default: `1`)|
 | `KLAYOUT_DRC_KLAYOUT_GDS` <a id="KLAYOUT_DRC_KLAYOUT_GDS"></a> | Enables running KLayout DRC on GDSII produced by KLayout. 1 = Enabled, 0 = Disabled <br> (Default: `0`)|
 | `KLAYOUT_XOR_THREADS` <a id="KLAYOUT_XOR_THREADS"></a> | Specifies number of threads used in klayout xor check <br> (Default: `1`)|
+| `KLAYOUT_DRC_THREADS` <a id="KLAYOUT_DRC_THREADS"></a> | Specifies number of threads used in klayout drc check <br> (Default: `1`)|
 | `TAKE_LAYOUT_SCROT` <a id="TAKE_LAYOUT_SCROT"></a> | Enables running KLayout to take a PNG screenshot of the produced layout (currently configured to run on the results of each stage).1 = Enabled, 0 = Disabled <br> (Default: `0`)|
 
 
@@ -390,6 +391,7 @@ These variables worked initially, but they were too sky130 specific and will be
 | `QUIT_ON_LINTER_WARNINGS` <a id="QUIT_ON_LINTER_WARNINGS"></a> | Quit on warnings generated by linter (currently Verilator) <br> (Default: `0`)|
 | `QUIT_ON_LINTER_ERRORS` <a id="QUIT_ON_LINTER_ERRORS"></a> | Quit on errors generated by linter (currently Verilator) <br> (Default: `1`)|
 | `QUIT_ON_XOR_ERROR` <a id="QUIT_ON_XOR_ERROR"></a> | Quit on XOR differences between GDSII generated by Magic and KLayout <br> (Default: `1`)|
+| `QUIT_ON_KLAYOUT_DRC` <a id="QUIT_ON_KLAYOUT_DRC"></a> | Checks for DRC violations after KLayout DRC is executed and exits the flow if any was found. 1 = Enabled, 0 = Disabled <br> (Default: `1`)|
 
 ## Misc.
 

docs/source/reference/openlane_commands.md

@@ -251,13 +251,11 @@ Most of the following commands' implementation exists in this [file][17]
 
 | Command      | Flags                   | Description                                           |
 |---------------|------------------------|-----------------------------------------|
-| `run_klayout` | | Streams the back-up final GDSII, generates a PNG screenshot, then runs KLayout DRC deck on it. This is controlled by `RUN_KLAYOUT`, `TAKE_LAYOUT_SCROT` ,and `KLAYOUT_DRC_KLAYOUT_GDS`. The resulting file is under `/<run_path>/results/klayout/` . |
+| `run_klayout` | | Streams the back-up final GDSII, generates a PNG screenshot, then runs KLayout DRC deck on it. This is controlled by `RUN_KLAYOUT` and `TAKE_LAYOUT_SCROT`. The resulting file is under `/<run_path>/results/klayout/` . |
 | `scrot_klayout` | | Export a PNG view of a given GDSII or DEF file. This is controlled by `TAKE_LAYOUT_SCROT`. |
 |    | `[-log <log_file>]` | Output log file. |
 |    | `[-layout <layout_file>]` | The input GDS or DEF file, the default is `::env(CURRENT_GDS)`. |
-| `run_klayout_drc` | | Runs KLayout DRC on a given GDSII file. This is controlled by `RUN_KLAYOUT_DRC`. |
-|    | `[-gds <gds_file>]` | The input GDS file, the default is `::env(CURRENT_GDS)`. |
-|    | `[-stage <stage>]` | The output stage using the DRC, the default is `magic`. The `magic` implies that the drc was run on the default GDS which is produced by magic. |
+| `run_klayout_drc` | | Runs KLayout DRC on a`::env(CURRENT_GDS)`. This is controlled by `RUN_KLAYOUT_DRC`. |
 | `run_klayout_gds_xor` | | Runs KLayout XOR on 2 GDSIIs. This is controlled by `RUN_KLAYOUT_XOR` and `KLAYOUT_XOR_GDS` and `KLAYOUT_XOR_XML`. |
 |    | `[-layout1 <gds_file>]` | The input GDS file, the default is the magic generated GDSII under `<run_path>/results/magic/<design_name>.gds`. |
 |    | `[-layout2 <gds_file>]` | The input GDS file, the default is the klayout generated GDSII under `<run_path>/results/klayout/<design_name>.gds`. |

docs/source/reference/pdk_configuration.md

@@ -58,6 +58,8 @@ you're doing.
 | `KLAYOUT_PROPERTIES` | Points to the klayout properties file (.lyp). |
 | `KLAYOUT_DEF_LAYER_MAP` | Points to klayout deflef layer map file (.map). |
 | `KLAYOUT_XOR_IGNORE_LAYERS` | A space separated layers list to ignore during klayout xor check. |
+| `KLAYOUT_DRC_RUNSET` | A path to KLayout DRC runset. |
+| `KLAYOUT_DRC_OPTIONS` | Options availble to KLayout DRC runset. They vary from one PDK to another. |
 | `MAGIC_MAGICRC` | Points to the magicrc file that is sourced while running magic in the flow. |
 | `GPIO_PADS_LEF` | A list of the pads lef views. For example:`[glob "$::env(PDK_ROOT)/sky130A/libs.ref/sky130_fd_io/lef/sky130_fd_io.lef"]` |
 | `GPIO_PADS_PREFIX` | A list of pad cells name prefixes. |

scripts/klayout/xml_drc_report_to_json.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+# Copyright (c) 2023 Efabless Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import json
+
+from klayout.rdb import ReportDatabase
+import click
+
+
+@click.command()
+@click.option("--xml-file")
+@click.option("--json-file")
+def cli(xml_file, json_file):
+    database = ReportDatabase("Database")
+    json_database = {}
+    database.load(xml_file)
+    total = 0
+    for category in database.each_category():
+        num_items = category.num_items()
+        category_name = category.name()
+        json_database[category_name] = num_items
+        total += num_items
+
+    json_database = dict(sorted(json_database.items(), key=lambda item: item[1]))
+    json_database["total"] = total
+
+    with open(json_file, "w", encoding="utf8") as f:
+        json.dump(json_database, f)
+
+
+if __name__ == "__main__":
+    cli()

scripts/tcl_commands/all.tcl

@@ -638,6 +638,7 @@ proc prep {args} {
     handle_deprecated_config UNBUFFER_NETS RSZ_DONT_TOUCH_RX
 
     handle_deprecated_config RCX_SDC_FILE SIGNOFF_SDC_FILE
+    handle_deprecated_config PRIMARY_SIGNOFF_TOOL PRIMARY_GDSII_STREAMOUT_TOOL
 
     ### Checkers/Quitting
     handle_deprecated_config CHECK_ASSIGN_STATEMENTS QUIT_ON_ASSIGN_STATEMENTS

scripts/tcl_commands/checkers.tcl

@@ -307,7 +307,7 @@ proc quit_on_tr_drc {args} {
         puts_err "Total Number of violations is $checker"
         throw_error
     } else {
-        puts_info "No DRC violations after detailed routing."
+        puts_info "No Magic DRC violations after detailed routing."
     }
 }
 
@@ -324,7 +324,7 @@ proc quit_on_magic_drc {args} {
         puts_err "Total Number of violations is $checker"
         throw_error
     } else {
-        puts_info "No DRC violations after GDS streaming out."
+        puts_info "No Magic DRC violations after GDS streaming out."
     }
 }
 
@@ -387,4 +387,19 @@ proc quit_on_unconnected_pdn_nodes {args} {
     }
 }
 
+proc quit_on_klayout_drc {report_file} {
+    set violations_dict [json::json2dict [cat $report_file]]
+    set violations_count [dict get $violations_dict "total"]
+    if { $::env(QUIT_ON_KLAYOUT_DRC) && $violations_count != 0} {
+        puts_err "There are violations in the design after KLayout DRC."
+        puts_err "Total Number of violations is $violations_count"
+        throw_error
+    } elseif { $violations_count != 0 } {
+        puts_warn "There are violations in the design after KLayout DRC."
+        puts_warn "Total Number of violations is $violations_count"
+    } else {
+        puts_info "No KLayout DRC violations after GDS streaming out."
+    }
+}
+
 package provide openlane 0.9

scripts/tcl_commands/klayout.tcl

@@ -52,15 +52,15 @@ proc run_klayout {args} {
 		}
 
 
-		if { $::env(PRIMARY_SIGNOFF_TOOL) == "klayout" } {
+		if { $::env(PRIMARY_GDSII_STREAMOUT_TOOL) == "klayout" } {
 			set ::env(CURRENT_GDS) $::env(signoff_results)/$::env(DESIGN_NAME).gds
 			file copy -force $klayout_out $::env(CURRENT_GDS)
 		}
 
 		TIMER::timer_stop
 		exec echo "[TIMER::get_runtime]" | python3 $::env(SCRIPTS_DIR)/write_runtime.py "gdsii - klayout"
 		scrot_klayout -layout $::env(signoff_results)/$::env(DESIGN_NAME).gds -log $::env(signoff_logs)/screenshot.klayout.log
-	} elseif { $::env(PRIMARY_SIGNOFF_TOOL) != "klayout" } {
+	} elseif { $::env(PRIMARY_GDSII_STREAMOUT_TOOL) != "klayout" } {
 		puts_warn "::env(KLAYOUT_TECH) is not defined for the current PDK. So, GDSII streaming out using KLayout will be skipped."
 		puts_warn "This warning can be turned off by setting ::env(RUN_KLAYOUT) to 0, or defining a tech file."
 	} else {
@@ -70,6 +70,72 @@ proc run_klayout {args} {
 
 }
 
+proc run_klayout_drc {args} {
+	set supported_pdks [list "sky130A" "sky130B"]
+
+	if {[lsearch -exact $supported_pdks $::env(PDK)] < 0} {
+		puts_warn "$::env(PDK) isn't supported by OpenLane during KLayout DRC. Skipping this step."
+		return
+	}
+
+	if { $::env(PDK) == "sky130A" || $::env(PDK) == "sky130B" } {
+		run_klayout_drc_sky130
+	}
+}
+proc run_klayout_drc_sky130 {args} {
+	if { ![info exists ::env(KLAYOUT_DRC_RUNSET)] || ![info exists ::env(KLAYOUT_DRC_OPTIONS)] } {
+		puts_warn "KLAYOUT_DRC_RUNSET and KLAYOUT_DRC_OPTIONS are missing. You may be using an out-of-date PDK version. KLayout DRC will be skipped."
+		return
+	}
+	set drc_script_path "$::env(KLAYOUT_DRC_RUNSET)"
+	set xml_report "$::env(signoff_reports)/violations.xml"
+	set json_report "$::env(signoff_reports)/violations.json"
+	set threads $::env(KLAYOUT_DRC_THREADS)
+	set feol "false"
+	set beol "false"
+	set floating_metal "false"
+	set offgrid "false"
+	set seal "false"
+	if { [dict get $::env(KLAYOUT_DRC_OPTIONS) feol] } {
+		set feol "true"
+	}
+	if { [dict get $::env(KLAYOUT_DRC_OPTIONS) beol] } {
+		set beol "true"
+	}
+	if { [dict get $::env(KLAYOUT_DRC_OPTIONS) offgrid] } {
+		set offgrid "true"
+	}
+	if { [dict get $::env(KLAYOUT_DRC_OPTIONS) seal] } {
+		set seal "true"
+	}
+	if { [dict get $::env(KLAYOUT_DRC_OPTIONS) floating_metal] } {
+		set floating_metal "true"
+	}
+	increment_index
+	set drc_log [index_file $::env(signoff_logs)/drc-klayout.log]
+	puts_info "Running KLayout DRC (log: [relpath . $drc_log])..."
+	TIMER::timer_start
+	try_exec klayout \
+		-b \
+		-zz \
+		-r $drc_script_path \
+		-rd topcell=$::env(DESIGN_NAME) \
+		-rd input=$::env(CURRENT_GDS) \
+		-rd report=$xml_report \
+		-rd feol=$feol \
+		-rd beol=$beol \
+		-rd floating_metal=$floating_metal \
+		-rd seal=$seal \
+		-rd thread=$threads \
+		|& tee $::env(TERMINAL_OUTPUT) $drc_log
+	try_exec python3 \
+		$::env(SCRIPTS_DIR)/klayout/xml_drc_report_to_json.py \
+		--xml-file $xml_report \
+		--json-file $json_report
+	TIMER::timer_stop
+	quit_on_klayout_drc $json_report
+}
+
 proc scrot_klayout {args} {
 	if {$::env(TAKE_LAYOUT_SCROT)} {
 		if {[ info exists ::env(KLAYOUT_TECH)] } {
@@ -90,7 +156,7 @@ proc scrot_klayout {args} {
 			puts_info "Screenshot taken."
 			TIMER::timer_stop
 			exec echo "[TIMER::get_runtime]" | python3 $::env(SCRIPTS_DIR)/write_runtime.py "screenshot - klayout"
-		} elseif { $::env(PRIMARY_SIGNOFF_TOOL) != "klayout" } {
+		} elseif { $::env(PRIMARY_GDSII_STREAMOUT_TOOL) != "klayout" } {
 			puts_warn "::env(KLAYOUT_DRC_TECH_SCRIPT) is not defined for the current PDK. So, GDSII streaming out using KLayout will be skipped."
 			puts_warn "This warning can be turned off by setting ::env(RUN_KLAYOUT_DRC) to 0, or designating a tech file."
 		} else {
@@ -100,37 +166,6 @@ proc scrot_klayout {args} {
 	}
 }
 
-proc run_klayout_drc {args} {
-	if {[ info exists ::env(KLAYOUT_DRC_TECH_SCRIPT)] && [file exists $::env(KLAYOUT_DRC_TECH_SCRIPT)]} {
-		set options {
-			{-gds optional}
-			{-stage optional}
-		}
-		parse_key_args "run_klayout_drc" args arg_values $options
-		if {[info exists ::env(CURRENT_GDS)]} {
-			set_if_unset arg_values(-gds) $::env(CURRENT_GDS)
-		}
-		set_if_unset arg_values(-stage) magic
-
-		increment_index
-		TIMER::timer_start
-		set log [index_file $::env(signoff_logs)/$arg_values(-stage).drc.log]
-		puts_info "Running DRC on the layout using KLayout (log: [relpath . $log])..."
-
-		try_exec bash $::env(SCRIPTS_DIR)/klayout/run_drc.sh $::env(KLAYOUT_DRC_TECH_SCRIPT) $arg_values(-gds) $arg_values(-gds).lydrc |& tee $::env(TERMINAL_OUTPUT) $log
-		file copy -force $arg_values(-gds).lydrc [index_file $::env(signoff_reports)/$arg_values(-stage).lydrc]
-		puts_info "KLayout DRC Complete"
-		TIMER::timer_stop
-		exec echo "[TIMER::get_runtime]" | python3 $::env(SCRIPTS_DIR)/write_runtime.py "drc - klayout"
-	} elseif { $::env(PRIMARY_SIGNOFF_TOOL) != "klayout" } {
-		puts_warn "::env(KLAYOUT_DRC_TECH_SCRIPT) is not defined or doesn't exist for the current PDK. So, GDSII streaming out using KLayout will be skipped."
-		puts_warn "This warning can be turned off by setting ::env(RUN_KLAYOUT_DRC) to 0, or designating a tech file."
-	} else {
-		puts_err "::env(KLAYOUT_DRC_TECH_SCRIPT) is not defined or doesn't exist for the current PDK, however KLayout is set as the primary signoff tool. This is a critical error."
-		throw_error
-	}
-}
-
 proc run_klayout_gds_xor {args} {
 	set options {
 		{-layout1 optional}

scripts/tcl_commands/magic.tcl

@@ -32,7 +32,7 @@ proc run_magic {args} {
         -indexed_log $log\
         $::env(SCRIPTS_DIR)/magic/def/mag_gds.tcl
 
-    if { $::env(PRIMARY_SIGNOFF_TOOL) == "magic" } {
+    if { $::env(PRIMARY_GDSII_STREAMOUT_TOOL) == "magic" } {
         set ::env(CURRENT_GDS) $::env(signoff_results)/$::env(DESIGN_NAME).gds
         file copy -force $::env(MAGIC_GDS) $::env(CURRENT_GDS)
     }

tests/2038-drc_bad/issue_regression.py → tests/2038-magic-drc_bad/issue_regression.py

@@ -4,10 +4,11 @@
 
 args = sys.argv[1:]
 
+exit_code = args[1]
 run_folder = args[0]
 
 log_path = os.path.join(run_folder, "openlane.log")
-
+assert exit_code != 0, "OpenLane did not throw non zero exit code"
 assert (
     subprocess.call(
         ["grep", "-i", "There are violations in the design after Magic DRC", log_path]

tests/2038-drc_good/issue_regression.py → tests/2038-magic-drc_good/issue_regression.py

@@ -9,7 +9,7 @@
 log_path = os.path.join(run_folder, "openlane.log")
 assert (
     subprocess.call(
-        ["grep", "-i", "No DRC violations after GDS streaming out", log_path]
+        ["grep", "-i", "No Magic DRC violations after GDS streaming out", log_path]
     )
     == 0
 ), "OpenLane did not report the lack of DRC violations properly"

tests/2041-klayout-drc_bad/config.json

@@ -0,0 +1,16 @@
+{
+    "DESIGN_NAME": "inverter",
+    "VERILOG_FILES": [],
+    "RUN_CTS": false,
+    "CLOCK_PORT": null,
+    "PL_RANDOM_GLB_PLACEMENT": true,
+    "FP_SIZING": "absolute",
+    "DIE_AREA": "0 0 34.5 57.12",
+    "PL_TARGET_DENSITY": 0.75,
+    "FP_PDN_AUTO_ADJUST": false,
+    "FP_PDN_VPITCH": 25,
+    "FP_PDN_HPITCH": 25,
+    "FP_PDN_VOFFSET": 5,
+    "FP_PDN_HOFFSET": 5,
+    "DIODE_INSERTION_STRATEGY": 3
+}

tests/2041-klayout-drc_bad/interactive.tcl

@@ -0,0 +1,7 @@
+package require openlane;
+
+prep -design $::env(TEST_DIR) {*}$argv
+
+set ::env(CURRENT_GDS) $::env(TEST_DIR)/inverter.gds
+
+run_klayout_drc