f9008e6366
This is an ongoing series of commits that are reformatting our Python code. Reformatting is done with `black`. If you end up having problems merging this commit because you have made changes to a python file, the best way to handle that is to run git checkout --ours <yourfile> and then reformat it with black. If you run into any problems, post to discourse about it and we will try to help. RFC Thread below: https://discourse.llvm.org/t/rfc-document-and-standardize-python-code-style Differential Revision: https://reviews.llvm.org/D150782
44 lines
1.7 KiB
Python
44 lines
1.7 KiB
Python
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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# Simply a wrapper around the extension module of the same name.
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from ._mlir_libs import _mlirExecutionEngine as _execution_engine
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import ctypes
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__all__ = [
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"ExecutionEngine",
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]
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class ExecutionEngine(_execution_engine.ExecutionEngine):
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def lookup(self, name):
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"""Lookup a function emitted with the `llvm.emit_c_interface`
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attribute and returns a ctype callable.
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Raise a RuntimeError if the function isn't found.
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"""
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func = self.raw_lookup("_mlir_ciface_" + name)
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if not func:
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raise RuntimeError("Unknown function " + name)
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prototype = ctypes.CFUNCTYPE(None, ctypes.c_void_p)
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return prototype(func)
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def invoke(self, name, *ctypes_args):
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"""Invoke a function with the list of ctypes arguments.
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All arguments must be pointers.
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Raise a RuntimeError if the function isn't found.
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"""
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func = self.lookup(name)
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packed_args = (ctypes.c_void_p * len(ctypes_args))()
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for argNum in range(len(ctypes_args)):
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packed_args[argNum] = ctypes.cast(ctypes_args[argNum], ctypes.c_void_p)
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func(packed_args)
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def register_runtime(self, name, ctypes_callback):
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"""Register a runtime function available to the jitted code
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under the provided `name`. The `ctypes_callback` must be a
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`CFuncType` that outlives the execution engine.
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"""
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callback = ctypes.cast(ctypes_callback, ctypes.c_void_p)
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self.raw_register_runtime("_mlir_ciface_" + name, callback)
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