From 4180cc537b7e1317dfe942ca889aa924e11e065b Mon Sep 17 00:00:00 2001 From: whitequark Date: Thu, 27 Aug 2020 06:24:18 +0000 Subject: [PATCH] _toolchain.cxx: new toolchain. --- nmigen/_toolchain/cxx.py | 52 ++++++++++++++++++++++++++++ tests/test_toolchain_cxx.py | 68 +++++++++++++++++++++++++++++++++++++ 2 files changed, 120 insertions(+) create mode 100644 nmigen/_toolchain/cxx.py create mode 100644 tests/test_toolchain_cxx.py diff --git a/nmigen/_toolchain/cxx.py b/nmigen/_toolchain/cxx.py new file mode 100644 index 0000000..32f1256 --- /dev/null +++ b/nmigen/_toolchain/cxx.py @@ -0,0 +1,52 @@ +import tempfile +import sysconfig +import os.path +from distutils import ccompiler + + +__all__ = ["build_cxx"] + + +def build_cxx(*, cxx_sources, output_name, include_dirs, macros): + build_dir = tempfile.TemporaryDirectory(prefix="nmigen_cxx_") + + cwd = os.getcwd() + try: + # Unforuntately, `ccompiler.compile` assumes the paths are relative, and interprets + # the directory name of the source path specially. That makes it necessary to build in + # the output directory directly. + os.chdir(build_dir.name) + + cc_driver = ccompiler.new_compiler() + cc_driver.output_dir = "." + + cc = sysconfig.get_config_var("CC") + cxx = sysconfig.get_config_var("CXX") + cflags = sysconfig.get_config_var("CCSHARED") + ld_ldflags = sysconfig.get_config_var("LDCXXSHARED") + cc_driver.set_executables( + compiler=f"{cc} {cflags}", + compiler_so=f"{cc} {cflags}", + compiler_cxx=f"{cxx} {cflags}", + linker_so=ld_ldflags, + ) + + for include_dir in include_dirs: + cc_driver.add_include_dir(include_dir) + for macro in macros: + cc_driver.define_macro(macro) + for cxx_filename, cxx_source in cxx_sources.items(): + with open(cxx_filename, "w") as f: + f.write(cxx_source) + + cxx_filenames = list(cxx_sources.keys()) + obj_filenames = cc_driver.object_filenames(cxx_filenames) + so_filename = cc_driver.shared_object_filename(output_name) + + cc_driver.compile(cxx_filenames) + cc_driver.link_shared_object(obj_filenames, output_filename=so_filename, target_lang="c++") + + return build_dir, so_filename + + finally: + os.chdir(cwd) diff --git a/tests/test_toolchain_cxx.py b/tests/test_toolchain_cxx.py new file mode 100644 index 0000000..01021e2 --- /dev/null +++ b/tests/test_toolchain_cxx.py @@ -0,0 +1,68 @@ +import os +import ctypes +import tempfile +import unittest + +from nmigen._toolchain.cxx import * + + +class ToolchainCxxTestCase(unittest.TestCase): + def setUp(self): + self.include_dir = None + self.build_dir = None + + def tearDown(self): + if self.include_dir: + self.include_dir.cleanup() + if self.build_dir: + self.build_dir.cleanup() + + def test_filename(self): + self.build_dir, filename = build_cxx( + cxx_sources={"test.cc": ""}, + output_name="answer", + include_dirs=[], + macros=[], + ) + self.assertTrue(filename.startswith("answer")) + + def test_simple(self): + self.build_dir, filename = build_cxx( + cxx_sources={"test.cc": """ + extern "C" int answer() { return 42; } + """}, + output_name="answer", + include_dirs=[], + macros=[], + ) + library = ctypes.cdll.LoadLibrary(os.path.join(self.build_dir.name, filename)) + self.assertEqual(library.answer(), 42) + + def test_macro(self): + self.build_dir, filename = build_cxx( + cxx_sources={"test.cc": """ + extern "C" int answer() { return ANSWER; } + """}, + output_name="answer", + include_dirs=[], + macros=["ANSWER=42"], + ) + library = ctypes.cdll.LoadLibrary(os.path.join(self.build_dir.name, filename)) + self.assertEqual(library.answer(), 42) + + def test_include(self): + self.include_dir = tempfile.TemporaryDirectory(prefix="nmigen_hxx_") + with open(os.path.join(self.include_dir.name, "answer.h"), "w") as f: + f.write("#define ANSWER 42") + + self.build_dir, filename = build_cxx( + cxx_sources={"test.cc": """ + #include + extern "C" int answer() { return ANSWER; } + """}, + output_name="answer", + include_dirs=[self.include_dir.name], + macros=[], + ) + library = ctypes.cdll.LoadLibrary(os.path.join(self.build_dir.name, filename)) + self.assertEqual(library.answer(), 42) -- 2.30.2