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99 lines
2.7 KiB
Python
99 lines
2.7 KiB
Python
#===- core.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 .common import LLVMObject
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from .common import c_object_p
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from .common import get_library
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from . import enumerations
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from ctypes import POINTER
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from ctypes import byref
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from ctypes import c_char_p
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__all__ = [
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"lib",
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"MemoryBuffer",
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]
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lib = get_library()
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class OpCode(object):
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"""Represents an individual OpCode enumeration."""
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_value_map = {}
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def __init__(self, name, value):
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self.name = name
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self.value = value
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def __repr__(self):
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return 'OpCode.%s' % self.name
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@staticmethod
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def from_value(value):
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"""Obtain an OpCode instance from a numeric value."""
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result = OpCode._value_map.get(value, None)
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if result is None:
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raise ValueError('Unknown OpCode: %d' % value)
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return result
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@staticmethod
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def register(name, value):
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"""Registers a new OpCode enumeration.
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This is called by this module for each enumeration defined in
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enumerations. You should not need to call this outside this module.
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"""
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if value in OpCode._value_map:
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raise ValueError('OpCode value already registered: %d' % value)
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opcode = OpCode(name, value)
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OpCode._value_map[value] = opcode
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setattr(OpCode, name, opcode)
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class MemoryBuffer(LLVMObject):
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"""Represents an opaque memory buffer."""
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def __init__(self, filename=None):
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"""Create a new memory buffer.
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Currently, we support creating from the contents of a file at the
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specified filename.
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"""
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if filename is None:
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raise Exception("filename argument must be defined")
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memory = c_object_p()
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out = c_char_p(None)
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result = lib.LLVMCreateMemoryBufferWithContentsOfFile(filename,
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byref(memory), byref(out))
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if result:
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raise Exception("Could not create memory buffer: %s" % out.value)
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LLVMObject.__init__(self, memory, disposer=lib.LLVMDisposeMemoryBuffer)
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def register_library(library):
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library.LLVMCreateMemoryBufferWithContentsOfFile.argtypes = [c_char_p,
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POINTER(c_object_p), POINTER(c_char_p)]
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library.LLVMCreateMemoryBufferWithContentsOfFile.restype = bool
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library.LLVMDisposeMemoryBuffer.argtypes = [MemoryBuffer]
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def register_enumerations():
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for name, value in enumerations.OpCodes:
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OpCode.register(name, value)
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register_library(lib)
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register_enumerations()
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