[RTG] Add the PyRTG frontend

This commit adds the boiler plate and basic rtgtool with a minimal example to run.

frontends/CMakeLists.txt

@@ -7,7 +7,9 @@
 # ===-----------------------------------------------------------------------===//
 
 set (CIRCT_KNOWN_FRONTENDS
-  PyCDE)
+  PyCDE
+  PyRTG
+)
 set(CIRCT_ENABLE_FRONTENDS "" CACHE STRING "List of frontends to enable")
 foreach(proj ${CIRCT_KNOWN_FRONTENDS})
   string(TOUPPER "${proj}" upper_proj)

frontends/PyRTG/.gitignore

@@ -0,0 +1,5 @@
+
+# /src/circt created via
+#   `ln -s <build dir>/tools/circt/python_packages/pyrtg/pyrtg/circt frontends/PyRTG/src/circt`
+# to help PyRTG devs with code completion.
+/src/pyrtg/circt

frontends/PyRTG/CMakeLists.txt

@@ -0,0 +1,22 @@
+# ===- CMakeLists.txt - PyRTG top level cmake -----------------*- cmake -*-===//
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===//
+
+llvm_canonicalize_cmake_booleans(
+  CIRCT_BINDINGS_PYTHON_ENABLED
+)
+
+if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+  message(FATAL_ERROR "PyRTG cannot be built as separate project")
+endif()
+
+if (NOT CIRCT_BINDINGS_PYTHON_ENABLED)
+  message(FATAL_ERROR "PyRTG requires that CIRCT python bindings be enabled")
+endif()
+
+add_subdirectory(src)
+add_subdirectory(test)

frontends/PyRTG/pyproject.toml

@@ -0,0 +1,23 @@
+[build-system]
+requires = [
+  "setuptools>=68",
+  "setuptools_scm>=8.0",
+  "wheel",
+  "cmake>=3.12",
+
+  # MLIR build depends.
+  "numpy",
+  "pybind11>=2.11,<=2.12",
+  "nanobind==2.4.0",
+  "PyYAML",
+
+  # PyRTG depends
+]
+build-backend = "setuptools.build_meta"
+
+# Enable version inference from Git.
+[tool.setuptools_scm]
+root = "../.."
+tag_regex = "^pyrtg-(\\d+\\.\\d+\\.\\d+)?$"
+local_scheme = "no-local-version"
+git_describe_command = "git describe --dirty --tags --long --match pyrtg*"

frontends/PyRTG/src/CMakeLists.txt

@@ -0,0 +1,66 @@
+# ===- CMakeLists.txt - PyRTG sources -------------------------*- cmake -*-===//
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+# ===----------------------------------------------------------------------===//
+
+include(AddMLIRPython)
+
+add_compile_definitions("MLIR_PYTHON_PACKAGE_PREFIX=pyrtg.circt.")
+
+declare_mlir_python_sources(PyRTGSources
+  ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
+  SOURCES
+  pyrtg/__init__.py
+  pyrtg/tests.py
+  rtgtool/rtgtool.py
+)
+
+################################################################################
+# Build composite binaries
+################################################################################
+
+set(PYRTG_PYTHON_PACKAGE_DIR "${CIRCT_PYTHON_PACKAGES_DIR}/pyrtg/")
+
+# Bundle our own, self-contained CAPI library with all of our deps.
+add_mlir_python_common_capi_library(PyRTG_CIRCTPythonCAPI
+  INSTALL_COMPONENT CIRCTBindingsPythonModules
+  INSTALL_DESTINATION python_packages/pyrtg/circt/_mlir_libs
+  OUTPUT_DIRECTORY "${PYRTG_PYTHON_PACKAGE_DIR}/pyrtg/circt/_mlir_libs"
+  RELATIVE_INSTALL_ROOT "../../.."
+  DECLARED_SOURCES
+    MLIRPythonSources.Core
+    CIRCTBindingsPythonExtension
+)
+
+add_mlir_python_modules(PyRTG_CIRCTPythonModules
+  ROOT_PREFIX "${PYRTG_PYTHON_PACKAGE_DIR}/pyrtg/circt"
+  INSTALL_PREFIX "python_packages/pyrtg/circt"
+  DECLARED_SOURCES
+    MLIRPythonSources.Core
+    CIRCTBindingsPythonExtension
+    CIRCTBindingsPythonSources
+  COMMON_CAPI_LINK_LIBS
+    PyRTG_CIRCTPythonCAPI
+)
+
+add_mlir_python_modules(PyRTG
+  ROOT_PREFIX "${PYRTG_PYTHON_PACKAGE_DIR}/"
+  INSTALL_PREFIX "python_packages/"
+  DECLARED_SOURCES
+    PyRTGSources
+  COMMON_CAPI_LINK_LIBS
+    PyRTG_CIRCTPythonCAPI
+)
+
+install(TARGETS PyRTG_CIRCTPythonCAPI
+  DESTINATION python_packages/pyrtg/circt/_mlir_libs
+  RUNTIME_DEPENDENCIES
+    PRE_EXCLUDE_REGEXES ".*"
+    PRE_INCLUDE_REGEXES ".*zlib.*"
+  COMPONENT PyRTG
+)
+add_dependencies(PyRTG PyRTG_CIRCTPythonModules)
+add_dependencies(install-PyRTG install-PyRTG_CIRCTPythonModules)

frontends/PyRTG/src/pyrtg/__init__.py

@@ -0,0 +1,7 @@
+#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+#  See https://llvm.org/LICENSE.txt for license information.
+#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+from . import circt
+from . import tests
+from .tests import test

frontends/PyRTG/src/pyrtg/tests.py

@@ -0,0 +1,42 @@
+#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+#  See https://llvm.org/LICENSE.txt for license information.
+#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+import inspect
+
+from .circt import ir
+from .circt.dialects import rtg
+
+
+class Test:
+  """
+  Represents an RTG Test. Stores the test function and location.
+  """
+
+  type: ir.Type
+
+  def __init__(self, test_func):
+    self.test_func = test_func
+
+    sig = inspect.signature(test_func)
+    assert len(sig.parameters) == 0, "test arguments not supported yet"
+
+    self.type = rtg.DictType.get(None, [])
+
+  @property
+  def name(self) -> str:
+    return self.test_func.__name__
+
+  def codegen(self):
+    test = rtg.TestOp(self.name, ir.TypeAttr.get(self.type))
+    block = ir.Block.create_at_start(test.bodyRegion, [])
+    with ir.InsertionPoint(block):
+      self.test_func(*block.arguments)
+
+
+def test(func):
+  """
+  Decorator for RTG test functions.
+  """
+
+  return Test(func)