[circt-test] fix SymbiYosys integration test

CMakeLists.txt

@@ -525,6 +525,24 @@ else()
   endif()
 endif()
 
+#-------------------------------------------------------------------------------
+# SymbiYosys Configuration
+#-------------------------------------------------------------------------------
+
+# If SymbiYosys hasn't been explicitly disabled, find it.
+option(SBY_DISABLE "Disable the SymbiYosys tests.")
+if (SBY_DISABLE)
+  message(STATUS "Disabling SymbiYosys tests.")
+else()
+  find_program(SBY_PATH "sby")
+  if(EXISTS ${SBY_PATH})
+    message(STATUS "Found SymbiYosys at ${SBY_PATH}.")
+  else()
+    set(SBY_PATH "")
+    message(STATUS "Did not find SymbiYosys.")
+  endif()
+endif()
+
 #-------------------------------------------------------------------------------
 # Tcl bindings
 #-------------------------------------------------------------------------------

integration_test/lit.cfg.py

@@ -215,6 +215,12 @@
   tools.append(ToolSubst(f"%libz3", config.z3_library))
   config.available_features.add('libz3')
 
+# Enable SymbiYosys if it has been detected.
+if config.sby_path != "":
+  tool_dirs.append(config.sby_path)
+  tools.append('sby')
+  config.available_features.add('sby')
+
 # Add mlir-cpu-runner if the execution engine is built.
 if config.mlir_enable_execution_engine:
   config.available_features.add('mlir-cpu-runner')

integration_test/lit.site.cfg.py.in

@@ -59,6 +59,7 @@ config.mlir_enable_execution_engine = "@MLIR_ENABLE_EXECUTION_ENGINE@"
 config.slang_frontend_enabled = "@CIRCT_SLANG_FRONTEND_ENABLED@"
 config.arcilator_jit_enabled = @ARCILATOR_JIT_ENABLED@
 config.driver = "@CIRCT_SOURCE_DIR@/tools/circt-rtl-sim/driver.cpp"
+config.sby_path = "@SBY_PATH@"
 
 # Support substitution of the tools_dir with user parameters. This is
 # used when we can't determine the tool dir at configuration time.

tools/circt-test/circt-test-runner-sby.py

@@ -37,22 +37,26 @@
 """
 
 # Generate the SymbiYosys script.
-script = f"""
+script = """
   [tasks]
-  {('\n  ').join(tasks)}
+  {tasks}
 
 {options}
 
   [engines]
   smtbmc z3
 
   [script]
-  read -formal {source_path.name}
-  prep -top {args.test}
+  read -formal {source_path_name}
+  prep -top {test}
 
   [files]
   {source_path}
-"""
+""".format(tasks='\n  '.join(tasks),
+           options=options,
+           source_path_name=source_path.name,
+           test=args.test,
+           source_path=source_path)
 with open(script_path, "w") as f:
   for line in script.strip().splitlines():
     f.write(line.strip() + "\n")