tests: run on pyodide

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

.github/workflows/emscripten.yaml

@@ -0,0 +1,58 @@
+name: WASM
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+    - master
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-wasm-emscripten:
+    name: Pyodide wheel
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: true
+        fetch-depth: 0
+
+    - uses: actions/setup-python@v4
+      with:
+        python-version: "3.11"
+
+    - name: Install pyodide-build
+      run: pip install pyodide-build==0.23.4
+
+    - name: Compute emsdk version
+      id: compute-emsdk-version
+      run: |
+        # Prepare xbuild environment (side-effect)
+        pyodide config list
+        # Save EMSDK version
+        EMSCRIPTEN_VERSION=$(pyodide config get emscripten_version)
+        echo "emsdk-version=$EMSCRIPTEN_VERSION" >> $GITHUB_OUTPUT
+
+    - uses: mymindstorm/setup-emsdk@v12
+      with:
+        version: ${{ steps.compute-emsdk-version.outputs.emsdk-version }}
+        actions-cache-folder: emsdk-cache
+
+    - name: Build
+      run: PYODIDE_BUILD_EXPORTS=whole_archive CFLAGS=-fexceptions LDFLAGS=-fexceptions pyodide build
+      working-directory: tests
+
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 18
+
+    - name: Set up Pyodide virtual environment
+      run: |
+        pyodide venv .venv-pyodide
+        .venv-pyodide/bin/pip install $(echo -n tests/dist/*.whl)
+
+    - name: Test
+      run: .venv-pyodide/bin/pytest -o timeout=0 tests/test_*.py

include/pybind11/pybind11.h

@@ -222,7 +222,7 @@ class cpp_function : public function {
 
         /* Dispatch code which converts function arguments and performs the actual function call */
         rec->impl = [](function_call &call) -> handle {
-            cast_in args_converter;
+            cast_in args_converter{};
 
             /* Try to cast the function arguments into the C++ domain */
             if (!args_converter.load_args(call)) {

tests/CMakeLists.txt

@@ -88,7 +88,12 @@ set(PYBIND11_TEST_FILTER
 if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
   # We're being loaded directly, i.e. not via add_subdirectory, so make this
   # work as its own project and load the pybind11Config to get the tools we need
-  find_package(pybind11 REQUIRED CONFIG)
+
+  if(SKBUILD)
+    add_subdirectory(.. pybind11_src)
+  else()
+    find_package(pybind11 REQUIRED CONFIG)
+  endif()
 endif()
 
 if(NOT CMAKE_BUILD_TYPE AND NOT DEFINED CMAKE_CONFIGURATION_TYPES)
@@ -488,6 +493,9 @@ foreach(target ${test_targets})
       endforeach()
     endif()
   endif()
+  if(SKBUILD)
+    install(TARGETS ${target} LIBRARY DESTINATION .)
+  endif()
 endforeach()
 
 # Provide nice organisation in IDEs

tests/pyproject.toml

@@ -0,0 +1,11 @@
+# Warning: this is currently used for pyodide, and is not a general out-of-tree
+# builder for the tests (yet). Specifically, wheels can't be built from SDists.
+
+[build-system]
+requires = ["scikit-build-core[pyproject]"]
+build-backend = "scikit_build_core.build"
+
+[project]
+name = "pybind11_tests"
+version = "0.0.1"
+dependencies = ["pytest", "pytest-timeout", "numpy", "scipy"]

tests/test_async.py

@@ -1,8 +1,13 @@
+import sys
+
 import pytest
 
 asyncio = pytest.importorskip("asyncio")
 m = pytest.importorskip("pybind11_tests.async_module")
 
+if sys.platform.startswith("emscripten"):
+    pytest.skip("Can't run a new event_loop in pyodide", allow_module_level=True)
+
 
 @pytest.fixture()
 def event_loop():

tests/test_callbacks.py

@@ -1,3 +1,4 @@
+import sys
 import time
 from threading import Thread
 
@@ -151,6 +152,7 @@ def test_python_builtins():
     assert m.test_sum_builtin(sum, []) == 0
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_async_callbacks():
     # serves as state for async callback
     class Item:
@@ -174,6 +176,7 @@ def gen_f():
     assert sum(res) == sum(x + 3 for x in work)
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_async_async_callbacks():
     t = Thread(target=test_async_callbacks)
     t.start()

tests/test_embed/test_interpreter.py

@@ -1,5 +1,12 @@
 import sys
 
+import pytest
+
+if sys.platform.startswith("emscripten"):
+    pytest.skip(
+        "Test not implemented from single wheel on Pyodide", allow_module_level=True
+    )
+
 from widget_module import Widget
 
 

tests/test_embed/test_trampoline.py

@@ -1,3 +1,12 @@
+import sys
+
+import pytest
+
+if sys.platform.startswith("emscripten"):
+    pytest.skip(
+        "Test not implemented from single wheel on Pyodide", allow_module_level=True
+    )
+
 import trampoline_module
 
 

tests/test_exceptions.py

@@ -73,7 +73,7 @@ def test_cross_module_exceptions(msg):
 
 # TODO: FIXME
 @pytest.mark.xfail(
-    "env.MACOS and (env.PYPY or pybind11_tests.compiler_info.startswith('Homebrew Clang'))",
+    "env.MACOS and (env.PYPY or pybind11_tests.compiler_info.startswith('Homebrew Clang')) or sys.platform.startswith('emscripten')",
     raises=RuntimeError,
     reason="See Issue #2847, PR #2999, PR #4324",
 )

tests/test_gil_scoped.py

@@ -69,24 +69,28 @@ def test_cross_module_gil_inner_pybind11_acquired():
     m.test_cross_module_gil_inner_pybind11_acquired()
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_cross_module_gil_nested_custom_released():
     """Makes sure that the GIL can be nested acquired/released by another module
     from a GIL-released state using custom locking logic."""
     m.test_cross_module_gil_nested_custom_released()
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_cross_module_gil_nested_custom_acquired():
     """Makes sure that the GIL can be nested acquired/acquired by another module
     from a GIL-acquired state using custom locking logic."""
     m.test_cross_module_gil_nested_custom_acquired()
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_cross_module_gil_nested_pybind11_released():
     """Makes sure that the GIL can be nested acquired/released by another module
     from a GIL-released state using pybind11 locking logic."""
     m.test_cross_module_gil_nested_pybind11_released()
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_cross_module_gil_nested_pybind11_acquired():
     """Makes sure that the GIL can be nested acquired/acquired by another module
     from a GIL-acquired state using pybind11 locking logic."""
@@ -101,6 +105,7 @@ def test_nested_acquire():
     assert m.test_nested_acquire(0xAB) == "171"
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_multi_acquire_release_cross_module():
     for bits in range(16 * 8):
         internals_ids = m.test_multi_acquire_release_cross_module(bits)
@@ -202,7 +207,7 @@ def _run_in_threads(test_fn, num_threads, parallel):
         thread.join()
 
 
-# TODO: FIXME, sometimes returns -11 (segfault) instead of 0 on macOS Python 3.9
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 @pytest.mark.parametrize("test_fn", ALL_BASIC_TESTS_PLUS_INTENTIONAL_DEADLOCK)
 def test_run_in_process_one_thread(test_fn):
     """Makes sure there is no GIL deadlock when running in a thread.
@@ -212,7 +217,7 @@ def test_run_in_process_one_thread(test_fn):
     assert _run_in_process(_run_in_threads, test_fn, num_threads=1, parallel=False) == 0
 
 
-# TODO: FIXME on macOS Python 3.9
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 @pytest.mark.parametrize("test_fn", ALL_BASIC_TESTS_PLUS_INTENTIONAL_DEADLOCK)
 def test_run_in_process_multiple_threads_parallel(test_fn):
     """Makes sure there is no GIL deadlock when running in a thread multiple times in parallel.
@@ -222,7 +227,7 @@ def test_run_in_process_multiple_threads_parallel(test_fn):
     assert _run_in_process(_run_in_threads, test_fn, num_threads=8, parallel=True) == 0
 
 
-# TODO: FIXME on macOS Python 3.9
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 @pytest.mark.parametrize("test_fn", ALL_BASIC_TESTS_PLUS_INTENTIONAL_DEADLOCK)
 def test_run_in_process_multiple_threads_sequential(test_fn):
     """Makes sure there is no GIL deadlock when running in a thread multiple times sequentially.
@@ -232,7 +237,7 @@ def test_run_in_process_multiple_threads_sequential(test_fn):
     assert _run_in_process(_run_in_threads, test_fn, num_threads=8, parallel=False) == 0
 
 
-# TODO: FIXME on macOS Python 3.9
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 @pytest.mark.parametrize("test_fn", ALL_BASIC_TESTS_PLUS_INTENTIONAL_DEADLOCK)
 def test_run_in_process_direct(test_fn):
     """Makes sure there is no GIL deadlock when using processes.

tests/test_iostream.py

@@ -1,6 +1,9 @@
+import sys
 from contextlib import redirect_stderr, redirect_stdout
 from io import StringIO
 
+import pytest
+
 from pybind11_tests import iostream as m
 
 
@@ -268,6 +271,7 @@ def test_redirect_both(capfd):
     assert stream2.getvalue() == msg2
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_threading():
     with m.ostream_redirect(stdout=True, stderr=False):
         # start some threads

tests/test_thread.py

@@ -1,5 +1,8 @@
+import sys
 import threading
 
+import pytest
+
 from pybind11_tests import thread as m
 
 
@@ -22,6 +25,7 @@ def join(self):
             raise self.e
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_implicit_conversion():
     a = Thread(m.test)
     b = Thread(m.test)
@@ -32,6 +36,7 @@ def test_implicit_conversion():
         x.join()
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_implicit_conversion_no_gil():
     a = Thread(m.test_no_gil)
     b = Thread(m.test_no_gil)

tests/test_virtual_functions.py

@@ -1,3 +1,5 @@
+import sys
+
 import pytest
 
 import env  # noqa: F401
@@ -433,6 +435,7 @@ def lucky_number(self):
     assert obj.say_everything() == "BT -7"
 
 
+@pytest.mark.skipif(sys.platform.startswith("emscripten"), reason="Requires threads")
 def test_issue_1454():
     # Fix issue #1454 (crash when acquiring/releasing GIL on another thread in Python 2.7)
     m.test_gil()