9f3f6d7bd8
* NFC but has some fixes for CMake glitches discovered along the way (things not cleaning properly, co-mingled depends). * Includes previously unsubmitted fix in D98681 and a TODO to fix it more appropriately in a smaller followup. Differential Revision: https://reviews.llvm.org/D101493
40 lines
1.5 KiB
Python
40 lines
1.5 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 ._cext_loader import _cext
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import ctypes
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class ExecutionEngine(_cext.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).value
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self.raw_register_runtime("_mlir_ciface_" + name, callback)
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