cyx-6 commented on code in PR #254: URL: https://github.com/apache/tvm-ffi/pull/254#discussion_r2986854632
########## addons/tvm-ffi-orcjit/python/tvm_ffi_orcjit/session.py: ########## @@ -0,0 +1,90 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. +"""ORC JIT Execution Session.""" + +from __future__ import annotations + +import sys + +from tvm_ffi import Object, register_object + +from . import _ffi_api, _lib_dir +from .dylib import DynamicLibrary + + +def _find_orc_rt_library() -> str | None: + """Find the bundled liborc_rt library in the same directory as the .so/.dll.""" + # Windows: skip ORC runtime entirely. LLVM's COFFPlatform (loaded via + # ExecutorNativePlatform with liborc_rt) depends on MSVC C++ runtime symbols + # that are not available in the JIT environment. On Windows, ORC JIT uses a + # C-only strategy: JIT objects are compiled as pure C (TVMFFISafeCallType ABI), + # avoiding all C++ runtime dependencies (magic statics, RTTI, sized delete, + # SEH, COMDAT). Our custom InitFiniPlugin handles .CRT$XC*/.CRT$XT* init/fini + # sections, and DLLImportDefinitionGenerator resolves __imp_ DLL import stubs. + if sys.platform == "win32": + return None + patterns = ["liborc_rt*.a"] + for pattern in patterns: + for lib_path in _lib_dir.glob(pattern): + return str(lib_path) + return None + + +@register_object("orcjit.ExecutionSession") +class ExecutionSession(Object): + """ORC JIT Execution Session. + + Manages the LLVM ORC JIT execution environment and creates dynamic libraries (JITDylibs). + This is the top-level context for JIT compilation and symbol management. + + Examples + -------- + >>> session = ExecutionSession() + >>> lib = session.create_library(name="main") + >>> lib.add("add.o") + >>> add_func = lib.get_function("add") + + """ + + def __init__(self, orc_rt_path: str | None = None) -> None: + """Initialize ExecutionSession. + + Args: + orc_rt_path: Optional path to the liborc_rt library. If not provided, + it will be automatically discovered using clang. + + """ + if orc_rt_path is None: + orc_rt_path = _find_orc_rt_library() + if orc_rt_path is None: + orc_rt_path = "" + self.__init_handle_by_constructor__(_ffi_api.ExecutionSession, orc_rt_path) # type: ignore + + def create_library(self, name: str = "") -> DynamicLibrary: + """Create a new dynamic library associated with this execution session. + + Args: + name: Optional name for the library. If empty, a unique name will be generated. + + Returns: + A new DynamicLibrary instance. + + """ + handle = _ffi_api.ExecutionSessionCreateDynamicLibrary(self, name) # type: ignore + lib = DynamicLibrary.__new__(DynamicLibrary) + lib.__move_handle_from__(handle) Review Comment: The C++ function orcjit.ExecutionSessionCreateDynamicLibrary returns Module (the base type), but we need Python's DynamicLibrary which adds add() and set_link_order() convenience methods. We need current solution to ship a DynamicLibrary instance. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
