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