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https://github.com/c64scene-ar/llvm-6502.git
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d3ac784fbb
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152505 91177308-0d34-0410-b5e6-96231b3b80d8
107 lines
3.1 KiB
Python
107 lines
3.1 KiB
Python
#===- common.py - Python LLVM Bindings -----------------------*- python -*--===#
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#
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# The LLVM Compiler Infrastructure
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#
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# This file is distributed under the University of Illinois Open Source
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# License. See LICENSE.TXT for details.
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#
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#===------------------------------------------------------------------------===#
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from ctypes import POINTER
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from ctypes import c_void_p
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from ctypes import cdll
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import ctypes.util
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__all__ = [
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'c_object_p',
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'find_library',
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'get_library',
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]
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c_object_p = POINTER(c_void_p)
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class LLVMObject(object):
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"""Base class for objects that are backed by an LLVM data structure.
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This class should never be instantiated outside of this package.
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"""
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def __init__(self, ptr, ownable=True, disposer=None):
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assert isinstance(ptr, c_object_p)
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self._ptr = self._as_parameter_ = ptr
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self._self_owned = True
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self._ownable = ownable
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self._disposer = disposer
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self._owned_objects = []
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def take_ownership(self, obj):
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"""Take ownership of another object.
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When you take ownership of another object, you are responsible for
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destroying that object. In addition, a reference to that object is
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placed inside this object so the Python garbage collector will not
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collect the object while it is still alive in libLLVM.
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This method should likely only be called from within modules inside
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this package.
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"""
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assert isinstance(obj, LLVMObject)
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self._owned_objects.append(obj)
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obj._self_owned = False
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def from_param(self):
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"""ctypes function that converts this object to a function parameter."""
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return self._as_parameter_
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def __del__(self):
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if not hasattr(self, '_self_owned') or not hasattr(self, '_disposer'):
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return
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if self._self_owned and self._disposer:
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self._disposer(self)
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class CachedProperty(object):
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"""Decorator that caches the result of a property lookup.
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This is a useful replacement for @property. It is recommended to use this
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decorator on properties that invoke C API calls for which the result of the
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call will be idempotent.
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"""
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def __init__(self, wrapped):
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self.wrapped = wrapped
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try:
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self.__doc__ = wrapped.__doc__
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except: # pragma: no cover
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pass
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def __get__(self, instance, instance_type=None):
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if instance is None:
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return self
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value = self.wrapped(instance)
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setattr(instance, self.wrapped.__name__, value)
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return value
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def find_library():
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# FIXME should probably have build system define absolute path of shared
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# library at install time.
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for lib in ['LLVM-3.1svn', 'libLLVM-3.1svn', 'LLVM', 'libLLVM']:
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result = ctypes.util.find_library(lib)
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if result:
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return result
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return None
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def get_library():
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"""Obtain a reference to the llvm library."""
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lib = find_library()
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if not lib:
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raise Exception('LLVM shared library not found!')
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return cdll.LoadLibrary(lib)
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