Reorganize how tb infrstructure selects toolchains

.github/workflows/build.yml

@@ -52,9 +52,7 @@ jobs:
       - name: Test
         run: |
           cd tests
-          export SKIP_SYNTH_TESTS=1
+          pytest --cov=peakrdl_regblock --synth-tool skip --sim-tool stub
-          export STUB_SIMULATOR=1
-          pytest --cov=peakrdl_regblock
 
       - name: Coveralls
         env:

.gitignore

@@ -7,6 +7,7 @@
 **/_build
 **/*.out
 **/transcript
+**/htmlcov
 **/*.log
 **/*.pb
 **/.Xil

tests/README.md

@@ -30,11 +30,6 @@ To run synthesis tests, Vivado needs to be installed and visible via the PATH en
 
 Vivado can be downloaded for free from: https://www.xilinx.com/support/download.html
 
-To skip synthesis tests, export the following environment variable:
-```bash
-export SKIP_SYNTH_TESTS=1
-```
-
 
 
 ## Python Packages
@@ -62,6 +57,13 @@ You can also run a specific testcase. For example:
 pytest tests/test_hw_access
 ```
 
+Command-line arguments can be used to explicitly select which simulator/synthesis tools are used
+If unspecified, the tool will be selected automatically based on what you have installed.
+```bash
+pytest --sim-tool questa --synth-tool vivado
+```
+
+
 Alternatively, launch tests using the helper script. This handles installing
 dependencies into a virtual environment automatically.
 ```bash

tests/conftest.py

@@ -0,0 +1,25 @@
+def pytest_addoption(parser):
+    parser.addoption(
+        "--sim-tool",
+        choices=["questa", "xilinx", "stub", "skip", "auto"],
+        default="auto",
+        help="""
+        Select the simulator to use.
+
+        stub: run the testcase using a no-op simulator stub
+        skip: skip all the simulation tests
+        auto: choose the best simulator based on what is installed
+        """
+    )
+
+    parser.addoption(
+        "--synth-tool",
+        choices=["vivado", "skip", "auto"],
+        default="auto",
+        help="""
+        Select the synthesis tool to use.
+
+        skip: skip all the simulation tests
+        auto: choose the best tool based on what is installed
+        """
+    )

tests/lib/base_testcase.py

@@ -1,4 +1,4 @@
-from typing import Optional, List
+from typing import Optional
 import unittest
 import os
 import glob
@@ -49,41 +49,37 @@ class BaseTestCase(unittest.TestCase):
     def _load_request(self, request):
         self.request = request
 
-    @classmethod
+    def get_testcase_dir(self) -> str:
-    def get_testcase_dir(cls) -> str:
+        class_dir = os.path.dirname(inspect.getfile(self.__class__))
-        class_dir = os.path.dirname(inspect.getfile(cls))
         return class_dir
 
-    @classmethod
+    def get_run_dir(self) -> str:
-    def get_run_dir(cls) -> str:
+        this_dir = self.get_testcase_dir()
-        this_dir = cls.get_testcase_dir()
+        run_dir = os.path.join(this_dir, "run.out", self.__class__.__name__)
-        run_dir = os.path.join(this_dir, "run.out", cls.__name__)
         return run_dir
 
-    @classmethod
+    def _write_params(self) -> None:
-    def _write_params(cls) -> None:
         """
         Write out the class parameters to a file so that it is easier to debug
         how a testcase was parameterized
         """
-        path = os.path.join(cls.get_run_dir(), "params.txt")
+        path = os.path.join(self.get_run_dir(), "params.txt")
 
         with open(path, 'w') as f:
-            for k, v in cls.__dict__.items():
+            for k, v in self.__class__.__dict__.items():
                 if k.startswith("_") or callable(v):
                     continue
                 f.write(f"{k}: {repr(v)}\n")
 
 
-    @classmethod
+    def _export_regblock(self):
-    def _export_regblock(cls):
         """
         Call the peakrdl_regblock exporter to generate the DUT
         """
-        this_dir = cls.get_testcase_dir()
+        this_dir = self.get_testcase_dir()
 
-        if cls.rdl_file:
+        if self.rdl_file:
-            rdl_file = cls.rdl_file
+            rdl_file = self.rdl_file
         else:
             # Find any *.rdl file in testcase dir
             rdl_file = glob.glob(os.path.join(this_dir, "*.rdl"))[0]
@@ -98,45 +94,33 @@ class BaseTestCase(unittest.TestCase):
         rdlc.compile_file(udp_file)
 
         rdlc.compile_file(rdl_file)
-        root = rdlc.elaborate(cls.rdl_elab_target, "regblock", cls.rdl_elab_params)
+        root = rdlc.elaborate(self.rdl_elab_target, "regblock", self.rdl_elab_params)
 
-        cls.exporter.export(
+        self.exporter.export(
             root,
-            cls.get_run_dir(),
+            self.get_run_dir(),
             module_name="regblock",
             package_name="regblock_pkg",
-            cpuif_cls=cls.cpuif.cpuif_cls,
+            cpuif_cls=self.cpuif.cpuif_cls,
-            retime_read_fanin=cls.retime_read_fanin,
+            retime_read_fanin=self.retime_read_fanin,
-            retime_read_response=cls.retime_read_response,
+            retime_read_response=self.retime_read_response,
-            reuse_hwif_typedefs=cls.reuse_hwif_typedefs,
+            reuse_hwif_typedefs=self.reuse_hwif_typedefs,
-            retime_external_reg=cls.retime_external,
+            retime_external_reg=self.retime_external,
-            retime_external_regfile=cls.retime_external,
+            retime_external_regfile=self.retime_external,
-            retime_external_mem=cls.retime_external,
+            retime_external_mem=self.retime_external,
-            retime_external_addrmap=cls.retime_external,
+            retime_external_addrmap=self.retime_external,
-            default_reset_activelow=cls.default_reset_activelow,
+            default_reset_activelow=self.default_reset_activelow,
-            default_reset_async=cls.default_reset_async,
+            default_reset_async=self.default_reset_async,
         )
 
-    @classmethod
+    def setUp(self) -> None:
-    def setUpClass(cls):
         # Create fresh build dir
-        run_dir = cls.get_run_dir()
+        run_dir = self.get_run_dir()
         if os.path.exists(run_dir):
             shutil.rmtree(run_dir)
         pathlib.Path(run_dir).mkdir(parents=True, exist_ok=True)
 
-        cls._write_params()
+        self._write_params()
 
         # Convert testcase RDL file --> SV
-        cls._export_regblock()
+        self._export_regblock()
-
-
-    def setUp(self) -> None:
-        # cd into the run directory
-        self.original_cwd = os.getcwd()
-        os.chdir(self.get_run_dir())
-
-
-    def run_test(self, plusargs:List[str] = None) -> None:
-        simulator = self.simulator_cls(testcase_cls_inst=self)
-        simulator.run(plusargs)

tests/lib/cpuifs/base.py

@@ -66,7 +66,7 @@ class CpuifTestMode:
         return self._get_file_paths("rtl_files")
 
 
-    def get_tb_inst(self, tb_cls: 'SimTestCase', exporter: 'RegblockExporter') -> str:
+    def get_tb_inst(self, testcase: 'SimTestCase', exporter: 'RegblockExporter') -> str:
         class_dir = self._get_class_dir_of_variable("tb_template")
         loader = jj.FileSystemLoader(class_dir)
         jj_env = jj.Environment(
@@ -77,7 +77,7 @@ class CpuifTestMode:
 
         context = {
             "cpuif": self,
-            "cls": tb_cls,
+            "testcase": testcase,
             "exporter": exporter,
             "type": type,
         }

tests/lib/sim_testcase.py

@@ -1,24 +1,21 @@
 from typing import List
 import os
+
 import jinja2 as jj
+import pytest
 
 from .sv_line_anchor import SVLineAnchor
 
-from .simulators.questa import Questa
+from .simulators import get_simulator_cls
-from .simulators import StubSimulator
 
 from .base_testcase import BaseTestCase
 
-SIM_CLS = Questa
-if os.environ.get("STUB_SIMULATOR", False):
-    SIM_CLS = StubSimulator
-
 
 class SimTestCase(BaseTestCase):
     #: Abort test if it exceeds this number of clock cycles
     timeout_clk_cycles = 5000
 
-    simulator_cls = SIM_CLS
+    incompatible_sim_tools = set()
 
     tb_template_file = "tb_template.sv"
 
@@ -32,17 +29,14 @@ class SimTestCase(BaseTestCase):
     clocking_hwif_in = True
     clocking_hwif_out = True
 
-
+    def get_extra_tb_files(self) -> List[str]:
-    @classmethod
-    def get_extra_tb_files(cls) -> List[str]:
         paths = []
-        for path in cls.extra_tb_files:
+        for path in self.extra_tb_files:
-            path = os.path.join(cls.get_testcase_dir(), path)
+            path = os.path.join(self.get_testcase_dir(), path)
             paths.append(path)
         return paths
 
-    @classmethod
+    def _generate_tb(self):
-    def _generate_tb(cls):
         """
         Render the testbench template into actual tb.sv
         """
@@ -57,32 +51,38 @@ class SimTestCase(BaseTestCase):
         )
 
         context = {
-            "cls": cls,
+            "testcase": self,
-            "exporter": cls.exporter,
+            "exporter": self.exporter,
         }
 
         # template path needs to be relative to the Jinja loader root
-        template_path = os.path.join(cls.get_testcase_dir(), cls.tb_template_file)
+        template_path = os.path.join(self.get_testcase_dir(), self.tb_template_file)
         template_path = os.path.relpath(template_path, template_root_path)
         template = jj_env.get_template(template_path)
 
-        output_path = os.path.join(cls.get_run_dir(), "tb.sv")
+        output_path = os.path.join(self.get_run_dir(), "tb.sv")
         stream = template.stream(context)
         stream.dump(output_path)
 
 
-    @classmethod
+    def setUp(self):
-    def setUpClass(cls):
+        name = self.request.config.getoption("--sim-tool")
-        super().setUpClass()
+        if name in self.incompatible_sim_tools:
+            pytest.skip()
+        simulator_cls = get_simulator_cls(name)
+        if simulator_cls is None:
+            pytest.skip()
+
+        super().setUp()
 
         # Create testbench from template
-        cls._generate_tb()
+        self._generate_tb()
 
-        simulator = cls.simulator_cls(testcase_cls=cls)
+        simulator = simulator_cls(self)
 
         # cd into the build directory
         cwd = os.getcwd()
-        os.chdir(cls.get_run_dir())
+        os.chdir(self.get_run_dir())
         try:
             simulator.compile()
         finally:
@@ -91,5 +91,16 @@ class SimTestCase(BaseTestCase):
 
 
     def run_test(self, plusargs:List[str] = None) -> None:
-        simulator = self.simulator_cls(testcase_cls_inst=self)
+        name = self.request.config.getoption("--sim-tool")
+        simulator_cls = get_simulator_cls(name)
+        simulator = simulator_cls(self)
+
+        # cd into the build directory
+        cwd = os.getcwd()
+        os.chdir(self.get_run_dir())
+
+        try:
             simulator.run(plusargs)
+        finally:
+            # cd back
+            os.chdir(cwd)

tests/lib/simulators/__init__.py

@@ -1,34 +1,37 @@
-from typing import Type, TYPE_CHECKING, List
+from typing import Type, Optional, List
+import functools
 
-if TYPE_CHECKING:
+from .base import Simulator
-    from ..sim_testcase import SimTestCase
+from .questa import Questa
+from .xilinx import Xilinx
+from .stub import StubSimulator
 
-class Simulator:
+ALL_SIMULATORS: List[Simulator]
+ALL_SIMULATORS = [
+    Questa,
+    Xilinx,
+    StubSimulator,
+]
 
-    def __init__(self, testcase_cls: 'Type[SimTestCase]' = None, testcase_cls_inst: 'SimTestCase' = None) -> None:
+@functools.lru_cache()
-        self.testcase_cls = testcase_cls
+def get_simulator_cls(name: str) -> Optional[Type[Simulator]]:
-        self.testcase_cls_inst = testcase_cls_inst
+    if name == "skip":
+        return None
 
-    @property
+    if name == "auto":
-    def tb_files(self) -> List[str]:
+        # Find the first simulator that is installed
-        files = []
+        for sim_cls in ALL_SIMULATORS:
-        files.extend(self.testcase_cls.cpuif.get_sim_files())
+            if sim_cls is StubSimulator:
-        files.extend(self.testcase_cls.get_extra_tb_files())
+                # Never offer the stub as an automatic option
-        files.append("regblock_pkg.sv")
+                continue
-        files.append("regblock.sv")
+            if sim_cls.is_installed():
-        files.append("tb.sv")
+                return sim_cls
+        raise ValueError("Could not find any installed simulators")
 
-        return files
+    # Look up which explicit simulator name was specified
-
+    for sim_cls in ALL_SIMULATORS:
-    def compile(self) -> None:
+        if sim_cls.name == name:
-        raise NotImplementedError
+            if not sim_cls.is_installed():
-
+                raise ValueError("Simulator '%s' is not installed" % sim_cls.name)
-    def run(self, plusargs:List[str] = None) -> None:
+            return sim_cls
-        raise NotImplementedError
+    raise RuntimeError
-
-class StubSimulator(Simulator):
-    def compile(self) -> None:
-        pass
-
-    def run(self, plusargs:List[str] = None) -> None:
-        pass

tests/lib/simulators/base.py

@@ -0,0 +1,31 @@
+from typing import TYPE_CHECKING, List
+
+if TYPE_CHECKING:
+    from ..sim_testcase import SimTestCase
+
+class Simulator:
+    name = ""
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        raise NotImplementedError
+
+    def __init__(self, testcase: 'SimTestCase' = None) -> None:
+        self.testcase = testcase
+
+    @property
+    def tb_files(self) -> List[str]:
+        files = []
+        files.extend(self.testcase.cpuif.get_sim_files())
+        files.extend(self.testcase.get_extra_tb_files())
+        files.append("regblock_pkg.sv")
+        files.append("regblock.sv")
+        files.append("tb.sv")
+
+        return files
+
+    def compile(self) -> None:
+        raise NotImplementedError
+
+    def run(self, plusargs:List[str] = None) -> None:
+        raise NotImplementedError

tests/lib/simulators/questa.py

@@ -1,10 +1,20 @@
 from typing import List
 import subprocess
 import os
+import shutil
 
-from . import Simulator
+from .base import Simulator
 
 class Questa(Simulator):
+    name = "questa"
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        return (
+            shutil.which("vlog") is not None
+            and shutil.which("vsim") is not None
+        )
+
     def compile(self) -> None:
         cmd = [
             "vlog", "-sv", "-quiet", "-l", "build.log",
@@ -31,7 +41,7 @@ class Questa(Simulator):
     def run(self, plusargs:List[str] = None) -> None:
         plusargs = plusargs or []
 
-        test_name = self.testcase_cls_inst.request.node.name
+        test_name = self.testcase.request.node.name
 
         # call vsim
         cmd = [
@@ -54,11 +64,11 @@ class Questa(Simulator):
 
 
     def assertSimLogPass(self, path: str):
-        self.testcase_cls_inst.assertTrue(os.path.isfile(path))
+        self.testcase.assertTrue(os.path.isfile(path))
 
         with open(path, encoding="utf-8") as f:
             for line in f:
                 if line.startswith("# ** Error"):
-                    self.testcase_cls_inst.fail(line)
+                    self.testcase.fail(line)
                 elif line.startswith("# ** Fatal"):
-                    self.testcase_cls_inst.fail(line)
+                    self.testcase.fail(line)

tests/lib/simulators/stub.py

@@ -0,0 +1,17 @@
+from typing import List
+
+from .base import Simulator
+
+class StubSimulator(Simulator):
+    name = "stub"
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        # Always available!
+        return True
+
+    def compile(self) -> None:
+        pass
+
+    def run(self, plusargs: List[str] = None) -> None:
+        pass

tests/lib/simulators/xilinx.py

@@ -1,22 +1,34 @@
 from typing import List
 import subprocess
 import os
+import shutil
 
-from . import Simulator
+from .base import Simulator
 
 class Xilinx(Simulator):
     """
     Don't bother using the Xilinx simulator... Its buggy and extraordinarily slow.
-    As observed in v2021.1:
+    As observed in v2023.2:
         - clocking block assignments do not seem to actually simulate correctly.
           assignment statements get ignored or the values get mangled.
         - Streaming operators have all sorts of limitations.
 
     Keeping this here in case someday it works better...
     """
+    name = "xilinx"
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        return (
+            shutil.which("xvlog") is not None
+            and shutil.which("xelab") is not None
+            and shutil.which("xsim") is not None
+        )
+
     def compile(self) -> None:
         cmd = [
             "xvlog", "--sv",
+            "--log", "compile.log",
             "--include", os.path.join(os.path.dirname(__file__), ".."),
             "--define", "XSIM",
         ]
@@ -25,6 +37,7 @@ class Xilinx(Simulator):
 
         cmd = [
             "xelab",
+            "--log", "elaborate.log",
             "--timescale", "1ns/1ps",
             "--debug", "all",
             "tb",
@@ -35,7 +48,7 @@ class Xilinx(Simulator):
     def run(self, plusargs:List[str] = None) -> None:
         plusargs = plusargs or []
 
-        test_name = self.testcase_cls_inst.request.node.name
+        test_name = self.testcase.request.node.name
 
         # call vsim
         cmd = [
@@ -54,13 +67,13 @@ class Xilinx(Simulator):
 
 
     def assertSimLogPass(self, path: str):
-        self.testcase_cls_inst.assertTrue(os.path.isfile(path))
+        self.testcase.assertTrue(os.path.isfile(path))
 
         with open(path, encoding="utf-8") as f:
             for line in f:
                 if line.startswith("Error:"):
-                    self.testcase_cls_inst.fail(line)
+                    self.testcase.fail(line)
                 elif line.startswith("Fatal:"):
-                    self.testcase_cls_inst.fail(line)
+                    self.testcase.fail(line)
                 elif line.startswith("FATAL_ERROR:"):
-                    self.testcase_cls_inst.fail(line)
+                    self.testcase.fail(line)

tests/lib/synth_testcase.py

@@ -1,12 +1,11 @@
 from typing import List
-import subprocess
 import os
 
 import pytest
 
 from .base_testcase import BaseTestCase
+from .synthesizers import get_synthesizer_cls
 
-@pytest.mark.skipif(os.environ.get("SKIP_SYNTH_TESTS", False), reason="user skipped")
 class SynthTestCase(BaseTestCase):
 
     def _get_synth_files(self) -> List[str]:
@@ -17,20 +16,24 @@ class SynthTestCase(BaseTestCase):
 
         return files
 
+    def setUp(self) -> None:
+        name = self.request.config.getoption("--synth-tool")
+        synth_cls = get_synthesizer_cls(name)
+        if synth_cls is None:
+            pytest.skip()
+        super().setUp()
 
     def run_synth(self) -> None:
-        script = os.path.join(
+        name = self.request.config.getoption("--synth-tool")
-            os.path.dirname(__file__),
+        synth_cls = get_synthesizer_cls(name)
-            "synthesis/vivado/run.tcl"
+        synth = synth_cls(self)
-        )
 
-        cmd = [
+        # cd into the build directory
-            "vivado", "-nojournal", "-notrace",
+        cwd = os.getcwd()
-            "-mode", "batch",
+        os.chdir(self.get_run_dir())
-            "-log", "out.log",
-            "-source", script,
-            "-tclargs"
-        ]
-        cmd.extend(self._get_synth_files())
 
-        subprocess.run(cmd, check=True)
+        try:
+            synth.run()
+        finally:
+            # cd back
+            os.chdir(cwd)

tests/lib/synthesizers/__init__.py

@@ -0,0 +1,30 @@
+from typing import List, Optional, Type
+import functools
+
+from .base import Synthesizer
+from .vivado import Vivado
+
+ALL_SYNTHESIZERS: List[Synthesizer]
+ALL_SYNTHESIZERS = [
+    Vivado,
+]
+
+@functools.lru_cache()
+def get_synthesizer_cls(name: str) -> Optional[Type[Synthesizer]]:
+    if name == "skip":
+        return None
+
+    if name == "auto":
+        # Find the first tool that is installed
+        for synth_cls in ALL_SYNTHESIZERS:
+            if synth_cls.is_installed():
+                return synth_cls
+        raise ValueError("Could not find any installed synthesis tools")
+
+    # Look up which explicit synth tool name was specified
+    for synth_cls in ALL_SYNTHESIZERS:
+        if synth_cls.name == name:
+            if not synth_cls.is_installed():
+                raise ValueError("Synthesis tool '%s' is not installed" % synth_cls.name)
+            return synth_cls
+    raise RuntimeError

tests/lib/synthesizers/base.py

@@ -0,0 +1,17 @@
+from typing import TYPE_CHECKING, List
+
+if TYPE_CHECKING:
+    from ..synth_testcase import SynthTestCase
+
+class Synthesizer:
+    name = ""
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        raise NotImplementedError
+
+    def __init__(self, testcase: 'SynthTestCase' = None) -> None:
+        self.testcase = testcase
+
+    def run(self) -> None:
+        raise NotImplementedError

tests/lib/synthesizers/vivado.py

@@ -0,0 +1,29 @@
+import os
+import subprocess
+import shutil
+
+from .base import Synthesizer
+
+class Vivado(Synthesizer):
+    name = "vivado"
+
+    @classmethod
+    def is_installed(cls) -> bool:
+        return shutil.which("vivado") is not None
+
+    def run(self) -> None:
+        script = os.path.join(
+            os.path.dirname(__file__),
+            "vivado_scripts/run.tcl"
+        )
+
+        cmd = [
+            "vivado", "-nojournal", "-notrace",
+            "-mode", "batch",
+            "-log", "out.log",
+            "-source", script,
+            "-tclargs"
+        ]
+        cmd.extend(self.testcase._get_synth_files())
+
+        subprocess.run(cmd, check=True)

tests/lib/tb_base.sv

@@ -40,11 +40,11 @@ module tb;
     default clocking cb @(posedge clk);
         default input #1step output #1;
         output rst;
-{%- if exporter.hwif.has_input_struct and cls.clocking_hwif_in %}
+{%- if exporter.hwif.has_input_struct and testcase.clocking_hwif_in %}
         output hwif_in;
 {%- endif %}
 
-{%- if exporter.hwif.has_output_struct and cls.clocking_hwif_out %}
+{%- if exporter.hwif.has_output_struct and testcase.clocking_hwif_out %}
         input hwif_out;
 {%- endif %}
 
@@ -61,7 +61,7 @@ module tb;
     //--------------------------------------------------------------------------
     // CPUIF
     //--------------------------------------------------------------------------
-    {{cls.cpuif.get_tb_inst(cls, exporter)|indent}}
+    {{testcase.cpuif.get_tb_inst(testcase, exporter)|indent}}
 
     //--------------------------------------------------------------------------
     // DUT
@@ -93,7 +93,7 @@ module tb;
     //--------------------------------------------------------------------------
     initial begin
         cb.rst <= '1;
-    {%- if exporter.hwif.has_input_struct and cls.init_hwif_in %}
+    {%- if exporter.hwif.has_input_struct and testcase.init_hwif_in %}
         cb.hwif_in <= '{default: '0};
     {%- endif %}
 
@@ -112,8 +112,8 @@ module tb;
     // Monitor for timeout
     //--------------------------------------------------------------------------
     initial begin
-        ##{{cls.timeout_clk_cycles}};
+        ##{{testcase.timeout_clk_cycles}};
-        $fatal(1, "Test timed out after {{cls.timeout_clk_cycles}} clock cycles");
+        $fatal(1, "Test timed out after {{testcase.timeout_clk_cycles}} clock cycles");
     end
 
 endmodule

tests/run.sh

@@ -19,10 +19,7 @@ pip install -U .
 cd $this_dir
 
 # Run unit tests
-export SKIP_SYNTH_TESTS=1
+pytest --workers auto --cov=peakrdl_regblock --synth-tool skip
-#export STUB_SIMULATOR=1
-export NO_XSIM=1
-pytest --workers auto --cov=peakrdl_regblock
 
 # Generate coverage report
 coverage html -i -d $this_dir/htmlcov

tests/test_buffered_swacc_swmod/testcase.py

@@ -1,5 +1,6 @@
 from ..lib.sim_testcase import SimTestCase
 
 class Test(SimTestCase):
+    incompatible_sim_tools = {"xilinx"}
     def test_dut(self):
         self.run_test()

tests/test_counter_basics/testcase.py

@@ -1,5 +1,6 @@
 from ..lib.sim_testcase import SimTestCase
 
 class Test(SimTestCase):
+    incompatible_sim_tools = {"xilinx"}
     def test_dut(self):
         self.run_test()

tests/test_read_fanin/tb_template.sv

@@ -2,9 +2,9 @@
 
 {%- block declarations %}
     {% sv_line_anchor %}
-    localparam REGWIDTH = {{cls.regwidth}};
+    localparam REGWIDTH = {{testcase.regwidth}};
     localparam STRIDE = REGWIDTH/8;
-    localparam N_REGS = {{cls.n_regs}};
+    localparam N_REGS = {{testcase.n_regs}};
 {%- endblock %}
 
 

tests/test_structural_sw_rw/testcase.py

@@ -1,13 +1,11 @@
 import os
 
 from parameterized import parameterized_class
-import pytest
 
 from ..lib.sim_testcase import SimTestCase
 from ..lib.synth_testcase import SynthTestCase
 from ..lib.test_params import get_permutations
 from ..lib.cpuifs import ALL_CPUIF
-from ..lib.simulators.xilinx import Xilinx
 
 
 
@@ -51,30 +49,3 @@ class TestDefaultResets(SimTestCase):
 class TestSynth(SynthTestCase):
     def test_dut(self):
         self.run_synth()
-
-
-
-@pytest.mark.skipif(os.environ.get("STUB_SIMULATOR", False) or os.environ.get("NO_XSIM", False), reason="user skipped")
-@parameterized_class(get_permutations({
-    "cpuif": ALL_CPUIF,
-    "retime_read_fanin": [True, False],
-    "retime_read_response": [True, False],
-    "reuse_hwif_typedefs": [True, False],
-}))
-class TestVivado(SimTestCase):
-    """
-    Vivado XSIM's implementation of clocking blocks is broken, which is heavily used
-    by the testbench infrastructure in most testcases.
-    Since this group of tests does not rely on writing HWIF values, the bugs in
-    xsim are avoided.
-
-    Run this testcase using xsim to get some cross-simulator coverage.
-    Goal is to validate the generated RTL doesn't use constructs that offend xsim.
-
-    This is skipped in CI stub tests as it doesn't add value
-    """
-
-    simulator_cls = Xilinx
-
-    def test_dut(self):
-        self.run_test()