619 lines
18 KiB
Python
619 lines
18 KiB
Python
from ctypes import (POINTER, byref, cast, c_char_p, c_double, c_int, c_size_t,
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c_uint, c_uint64, c_bool, c_void_p)
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import enum
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from llvmlite.binding import ffi
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from llvmlite.binding.common import _decode_string, _encode_string
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from llvmlite.binding.typeref import TypeRef
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class Linkage(enum.IntEnum):
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# The LLVMLinkage enum from llvm-c/Core.h
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external = 0
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available_externally = 1
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linkonce_any = 2
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linkonce_odr = 3
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linkonce_odr_autohide = 4
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weak_any = 5
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weak_odr = 6
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appending = 7
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internal = 8
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private = 9
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dllimport = 10
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dllexport = 11
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external_weak = 12
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ghost = 13
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common = 14
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linker_private = 15
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linker_private_weak = 16
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class Visibility(enum.IntEnum):
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# The LLVMVisibility enum from llvm-c/Core.h
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default = 0
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hidden = 1
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protected = 2
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class StorageClass(enum.IntEnum):
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# The LLVMDLLStorageClass enum from llvm-c/Core.h
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default = 0
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dllimport = 1
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dllexport = 2
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class ValueKind(enum.IntEnum):
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# The LLVMValueKind enum from llvm-c/Core.h
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argument = 0
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basic_block = 1
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memory_use = 2
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memory_def = 3
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memory_phi = 4
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function = 5
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global_alias = 6
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global_ifunc = 7
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global_variable = 8
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block_address = 9
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constant_expr = 10
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constant_array = 11
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constant_struct = 12
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constant_vector = 13
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undef_value = 14
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constant_aggregate_zero = 15
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constant_data_array = 16
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constant_data_vector = 17
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constant_int = 18
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constant_fp = 19
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constant_pointer_null = 20
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constant_token_none = 21
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metadata_as_value = 22
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inline_asm = 23
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instruction = 24
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poison_value = 25
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class ValueRef(ffi.ObjectRef):
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"""A weak reference to a LLVM value.
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"""
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def __init__(self, ptr, kind, parents):
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self._kind = kind
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self._parents = parents
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ffi.ObjectRef.__init__(self, ptr)
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def __str__(self):
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with ffi.OutputString() as outstr:
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ffi.lib.LLVMPY_PrintValueToString(self, outstr)
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return str(outstr)
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@property
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def module(self):
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"""
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The module this function or global variable value was obtained from.
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"""
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return self._parents.get('module')
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@property
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def function(self):
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"""
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The function this argument or basic block value was obtained from.
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"""
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return self._parents.get('function')
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@property
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def block(self):
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"""
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The block this instruction value was obtained from.
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"""
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return self._parents.get('block')
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@property
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def instruction(self):
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"""
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The instruction this operand value was obtained from.
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"""
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return self._parents.get('instruction')
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@property
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def is_global(self):
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return self._kind == 'global'
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@property
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def is_function(self):
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return self._kind == 'function'
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@property
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def is_block(self):
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return self._kind == 'block'
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@property
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def is_argument(self):
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return self._kind == 'argument'
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@property
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def is_instruction(self):
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return self._kind == 'instruction'
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@property
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def is_operand(self):
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return self._kind == 'operand'
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@property
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def is_constant(self):
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return bool(ffi.lib.LLVMPY_IsConstant(self))
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@property
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def value_kind(self):
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return ValueKind(ffi.lib.LLVMPY_GetValueKind(self))
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@property
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def name(self):
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return _decode_string(ffi.lib.LLVMPY_GetValueName(self))
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@name.setter
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def name(self, val):
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ffi.lib.LLVMPY_SetValueName(self, _encode_string(val))
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@property
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def linkage(self):
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return Linkage(ffi.lib.LLVMPY_GetLinkage(self))
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@linkage.setter
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def linkage(self, value):
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if not isinstance(value, Linkage):
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value = Linkage[value]
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ffi.lib.LLVMPY_SetLinkage(self, value)
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@property
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def visibility(self):
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return Visibility(ffi.lib.LLVMPY_GetVisibility(self))
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@visibility.setter
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def visibility(self, value):
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if not isinstance(value, Visibility):
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value = Visibility[value]
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ffi.lib.LLVMPY_SetVisibility(self, value)
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@property
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def storage_class(self):
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return StorageClass(ffi.lib.LLVMPY_GetDLLStorageClass(self))
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@storage_class.setter
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def storage_class(self, value):
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if not isinstance(value, StorageClass):
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value = StorageClass[value]
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ffi.lib.LLVMPY_SetDLLStorageClass(self, value)
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def add_function_attribute(self, attr):
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"""Only works on function value
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Parameters
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-----------
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attr : str
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attribute name
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"""
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if not self.is_function:
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raise ValueError('expected function value, got %s' % (self._kind,))
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attrname = str(attr)
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attrval = ffi.lib.LLVMPY_GetEnumAttributeKindForName(
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_encode_string(attrname), len(attrname))
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if attrval == 0:
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raise ValueError('no such attribute {!r}'.format(attrname))
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ffi.lib.LLVMPY_AddFunctionAttr(self, attrval)
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@property
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def type(self):
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"""
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This value's LLVM type.
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"""
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# XXX what does this return?
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return TypeRef(ffi.lib.LLVMPY_TypeOf(self))
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@property
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def is_declaration(self):
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"""
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Whether this value (presumably global) is defined in the current
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module.
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"""
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if not (self.is_global or self.is_function):
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raise ValueError('expected global or function value, got %s'
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% (self._kind,))
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return ffi.lib.LLVMPY_IsDeclaration(self)
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@property
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def attributes(self):
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"""
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Return an iterator over this value's attributes.
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The iterator will yield a string for each attribute.
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"""
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itr = iter(())
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if self.is_function:
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it = ffi.lib.LLVMPY_FunctionAttributesIter(self)
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itr = _AttributeListIterator(it)
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elif self.is_instruction:
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if self.opcode == 'call':
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it = ffi.lib.LLVMPY_CallInstAttributesIter(self)
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itr = _AttributeListIterator(it)
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elif self.opcode == 'invoke':
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it = ffi.lib.LLVMPY_InvokeInstAttributesIter(self)
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itr = _AttributeListIterator(it)
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elif self.is_global:
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it = ffi.lib.LLVMPY_GlobalAttributesIter(self)
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itr = _AttributeSetIterator(it)
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elif self.is_argument:
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it = ffi.lib.LLVMPY_ArgumentAttributesIter(self)
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itr = _AttributeSetIterator(it)
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return itr
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@property
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def blocks(self):
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"""
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Return an iterator over this function's blocks.
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The iterator will yield a ValueRef for each block.
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"""
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if not self.is_function:
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raise ValueError('expected function value, got %s' % (self._kind,))
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it = ffi.lib.LLVMPY_FunctionBlocksIter(self)
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parents = self._parents.copy()
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parents.update(function=self)
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return _BlocksIterator(it, parents)
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@property
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def arguments(self):
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"""
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Return an iterator over this function's arguments.
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The iterator will yield a ValueRef for each argument.
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"""
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if not self.is_function:
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raise ValueError('expected function value, got %s' % (self._kind,))
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it = ffi.lib.LLVMPY_FunctionArgumentsIter(self)
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parents = self._parents.copy()
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parents.update(function=self)
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return _ArgumentsIterator(it, parents)
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@property
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def instructions(self):
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"""
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Return an iterator over this block's instructions.
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The iterator will yield a ValueRef for each instruction.
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"""
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if not self.is_block:
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raise ValueError('expected block value, got %s' % (self._kind,))
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it = ffi.lib.LLVMPY_BlockInstructionsIter(self)
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parents = self._parents.copy()
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parents.update(block=self)
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return _InstructionsIterator(it, parents)
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@property
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def operands(self):
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"""
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Return an iterator over this instruction's operands.
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The iterator will yield a ValueRef for each operand.
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"""
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if not self.is_instruction:
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raise ValueError('expected instruction value, got %s'
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% (self._kind,))
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it = ffi.lib.LLVMPY_InstructionOperandsIter(self)
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parents = self._parents.copy()
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parents.update(instruction=self)
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return _OperandsIterator(it, parents)
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@property
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def opcode(self):
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if not self.is_instruction:
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raise ValueError('expected instruction value, got %s'
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% (self._kind,))
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return ffi.ret_string(ffi.lib.LLVMPY_GetOpcodeName(self))
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@property
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def incoming_blocks(self):
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"""
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Return an iterator over this phi instruction's incoming blocks.
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The iterator will yield a ValueRef for each block.
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"""
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if not self.is_instruction or self.opcode != 'phi':
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raise ValueError('expected phi instruction value, got %s'
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% (self._kind,))
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it = ffi.lib.LLVMPY_PhiIncomingBlocksIter(self)
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parents = self._parents.copy()
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parents.update(instruction=self)
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return _IncomingBlocksIterator(it, parents)
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def get_constant_value(self, signed_int=False, round_fp=False):
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"""
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Return the constant value, either as a literal (when supported)
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or as a string.
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Parameters
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-----------
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signed_int : bool
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if True and the constant is an integer, returns a signed version
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round_fp : bool
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if True and the constant is a floating point value, rounds the
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result upon accuracy loss (e.g., when querying an fp128 value).
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By default, raises an exception on accuracy loss
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"""
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if not self.is_constant:
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raise ValueError('expected constant value, got %s'
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% (self._kind,))
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if self.value_kind == ValueKind.constant_int:
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# Python integers are also arbitrary-precision
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little_endian = c_bool(False)
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words = ffi.lib.LLVMPY_GetConstantIntNumWords(self)
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ptr = ffi.lib.LLVMPY_GetConstantIntRawValue(
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self, byref(little_endian))
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asbytes = bytes(cast(ptr, POINTER(c_uint64 * words)).contents)
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return int.from_bytes(
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asbytes,
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('little' if little_endian.value else 'big'),
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signed=signed_int,
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)
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elif self.value_kind == ValueKind.constant_fp:
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# Convert floating-point values to double-precision (Python float)
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accuracy_loss = c_bool(False)
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value = ffi.lib.LLVMPY_GetConstantFPValue(self,
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byref(accuracy_loss))
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if accuracy_loss.value and not round_fp:
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raise ValueError(
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'Accuracy loss encountered in conversion of constant '
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f'value {str(self)}')
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return value
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# Otherwise, return the IR string
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return str(self)
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class _ValueIterator(ffi.ObjectRef):
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kind = None # derived classes must specify the Value kind value
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# as class attribute
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def __init__(self, ptr, parents):
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ffi.ObjectRef.__init__(self, ptr)
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# Keep parent objects (module, function, etc) alive
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self._parents = parents
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if self.kind is None:
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raise NotImplementedError('%s must specify kind attribute'
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% (type(self).__name__,))
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def __next__(self):
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vp = self._next()
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if vp:
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return ValueRef(vp, self.kind, self._parents)
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else:
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raise StopIteration
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next = __next__
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def __iter__(self):
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return self
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class _AttributeIterator(ffi.ObjectRef):
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def __next__(self):
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vp = self._next()
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if vp:
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return vp
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else:
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raise StopIteration
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next = __next__
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def __iter__(self):
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return self
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class _AttributeListIterator(_AttributeIterator):
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def _dispose(self):
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self._capi.LLVMPY_DisposeAttributeListIter(self)
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def _next(self):
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return ffi.ret_bytes(ffi.lib.LLVMPY_AttributeListIterNext(self))
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class _AttributeSetIterator(_AttributeIterator):
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def _dispose(self):
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self._capi.LLVMPY_DisposeAttributeSetIter(self)
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def _next(self):
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return ffi.ret_bytes(ffi.lib.LLVMPY_AttributeSetIterNext(self))
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class _BlocksIterator(_ValueIterator):
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kind = 'block'
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def _dispose(self):
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self._capi.LLVMPY_DisposeBlocksIter(self)
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def _next(self):
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return ffi.lib.LLVMPY_BlocksIterNext(self)
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class _ArgumentsIterator(_ValueIterator):
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kind = 'argument'
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def _dispose(self):
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self._capi.LLVMPY_DisposeArgumentsIter(self)
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def _next(self):
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return ffi.lib.LLVMPY_ArgumentsIterNext(self)
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class _InstructionsIterator(_ValueIterator):
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kind = 'instruction'
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def _dispose(self):
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self._capi.LLVMPY_DisposeInstructionsIter(self)
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def _next(self):
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return ffi.lib.LLVMPY_InstructionsIterNext(self)
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class _OperandsIterator(_ValueIterator):
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kind = 'operand'
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def _dispose(self):
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self._capi.LLVMPY_DisposeOperandsIter(self)
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def _next(self):
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return ffi.lib.LLVMPY_OperandsIterNext(self)
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class _IncomingBlocksIterator(_ValueIterator):
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kind = 'block'
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def _dispose(self):
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self._capi.LLVMPY_DisposeIncomingBlocksIter(self)
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def _next(self):
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return ffi.lib.LLVMPY_IncomingBlocksIterNext(self)
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# FFI
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ffi.lib.LLVMPY_PrintValueToString.argtypes = [
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ffi.LLVMValueRef,
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POINTER(c_char_p)
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]
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ffi.lib.LLVMPY_GetGlobalParent.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_GetGlobalParent.restype = ffi.LLVMModuleRef
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ffi.lib.LLVMPY_GetValueName.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_GetValueName.restype = c_char_p
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ffi.lib.LLVMPY_SetValueName.argtypes = [ffi.LLVMValueRef, c_char_p]
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ffi.lib.LLVMPY_TypeOf.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_TypeOf.restype = ffi.LLVMTypeRef
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ffi.lib.LLVMPY_GetTypeName.argtypes = [ffi.LLVMTypeRef]
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ffi.lib.LLVMPY_GetTypeName.restype = c_void_p
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ffi.lib.LLVMPY_GetLinkage.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_GetLinkage.restype = c_int
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ffi.lib.LLVMPY_SetLinkage.argtypes = [ffi.LLVMValueRef, c_int]
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ffi.lib.LLVMPY_GetVisibility.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_GetVisibility.restype = c_int
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ffi.lib.LLVMPY_SetVisibility.argtypes = [ffi.LLVMValueRef, c_int]
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|
ffi.lib.LLVMPY_GetDLLStorageClass.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_GetDLLStorageClass.restype = c_int
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ffi.lib.LLVMPY_SetDLLStorageClass.argtypes = [ffi.LLVMValueRef, c_int]
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ffi.lib.LLVMPY_GetEnumAttributeKindForName.argtypes = [c_char_p, c_size_t]
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ffi.lib.LLVMPY_GetEnumAttributeKindForName.restype = c_uint
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ffi.lib.LLVMPY_AddFunctionAttr.argtypes = [ffi.LLVMValueRef, c_uint]
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|
ffi.lib.LLVMPY_IsDeclaration.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_IsDeclaration.restype = c_int
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ffi.lib.LLVMPY_FunctionAttributesIter.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_FunctionAttributesIter.restype = ffi.LLVMAttributeListIterator
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ffi.lib.LLVMPY_CallInstAttributesIter.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_CallInstAttributesIter.restype = ffi.LLVMAttributeListIterator
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ffi.lib.LLVMPY_InvokeInstAttributesIter.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_InvokeInstAttributesIter.restype = ffi.LLVMAttributeListIterator
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|
ffi.lib.LLVMPY_GlobalAttributesIter.argtypes = [ffi.LLVMValueRef]
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|
ffi.lib.LLVMPY_GlobalAttributesIter.restype = ffi.LLVMAttributeSetIterator
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ffi.lib.LLVMPY_ArgumentAttributesIter.argtypes = [ffi.LLVMValueRef]
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ffi.lib.LLVMPY_ArgumentAttributesIter.restype = ffi.LLVMAttributeSetIterator
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|
|
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ffi.lib.LLVMPY_FunctionBlocksIter.argtypes = [ffi.LLVMValueRef]
|
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ffi.lib.LLVMPY_FunctionBlocksIter.restype = ffi.LLVMBlocksIterator
|
|
|
|
ffi.lib.LLVMPY_FunctionArgumentsIter.argtypes = [ffi.LLVMValueRef]
|
|
ffi.lib.LLVMPY_FunctionArgumentsIter.restype = ffi.LLVMArgumentsIterator
|
|
|
|
ffi.lib.LLVMPY_BlockInstructionsIter.argtypes = [ffi.LLVMValueRef]
|
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ffi.lib.LLVMPY_BlockInstructionsIter.restype = ffi.LLVMInstructionsIterator
|
|
|
|
ffi.lib.LLVMPY_InstructionOperandsIter.argtypes = [ffi.LLVMValueRef]
|
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ffi.lib.LLVMPY_InstructionOperandsIter.restype = ffi.LLVMOperandsIterator
|
|
|
|
ffi.lib.LLVMPY_PhiIncomingBlocksIter.argtypes = [ffi.LLVMValueRef]
|
|
ffi.lib.LLVMPY_PhiIncomingBlocksIter.restype = ffi.LLVMIncomingBlocksIterator
|
|
|
|
ffi.lib.LLVMPY_DisposeAttributeListIter.argtypes = [
|
|
ffi.LLVMAttributeListIterator]
|
|
|
|
ffi.lib.LLVMPY_DisposeAttributeSetIter.argtypes = [ffi.LLVMAttributeSetIterator]
|
|
|
|
ffi.lib.LLVMPY_DisposeBlocksIter.argtypes = [ffi.LLVMBlocksIterator]
|
|
|
|
ffi.lib.LLVMPY_DisposeInstructionsIter.argtypes = [ffi.LLVMInstructionsIterator]
|
|
|
|
ffi.lib.LLVMPY_DisposeOperandsIter.argtypes = [ffi.LLVMOperandsIterator]
|
|
|
|
ffi.lib.LLVMPY_DisposeIncomingBlocksIter.argtypes = [
|
|
ffi.LLVMIncomingBlocksIterator]
|
|
|
|
ffi.lib.LLVMPY_AttributeListIterNext.argtypes = [ffi.LLVMAttributeListIterator]
|
|
ffi.lib.LLVMPY_AttributeListIterNext.restype = c_void_p
|
|
|
|
ffi.lib.LLVMPY_AttributeSetIterNext.argtypes = [ffi.LLVMAttributeSetIterator]
|
|
ffi.lib.LLVMPY_AttributeSetIterNext.restype = c_void_p
|
|
|
|
ffi.lib.LLVMPY_BlocksIterNext.argtypes = [ffi.LLVMBlocksIterator]
|
|
ffi.lib.LLVMPY_BlocksIterNext.restype = ffi.LLVMValueRef
|
|
|
|
ffi.lib.LLVMPY_ArgumentsIterNext.argtypes = [ffi.LLVMArgumentsIterator]
|
|
ffi.lib.LLVMPY_ArgumentsIterNext.restype = ffi.LLVMValueRef
|
|
|
|
ffi.lib.LLVMPY_InstructionsIterNext.argtypes = [ffi.LLVMInstructionsIterator]
|
|
ffi.lib.LLVMPY_InstructionsIterNext.restype = ffi.LLVMValueRef
|
|
|
|
ffi.lib.LLVMPY_OperandsIterNext.argtypes = [ffi.LLVMOperandsIterator]
|
|
ffi.lib.LLVMPY_OperandsIterNext.restype = ffi.LLVMValueRef
|
|
|
|
ffi.lib.LLVMPY_IncomingBlocksIterNext.argtypes = [
|
|
ffi.LLVMIncomingBlocksIterator]
|
|
ffi.lib.LLVMPY_IncomingBlocksIterNext.restype = ffi.LLVMValueRef
|
|
|
|
ffi.lib.LLVMPY_GetOpcodeName.argtypes = [ffi.LLVMValueRef]
|
|
ffi.lib.LLVMPY_GetOpcodeName.restype = c_void_p
|
|
|
|
ffi.lib.LLVMPY_IsConstant.argtypes = [ffi.LLVMValueRef]
|
|
ffi.lib.LLVMPY_IsConstant.restype = c_bool
|
|
|
|
ffi.lib.LLVMPY_GetValueKind.argtypes = [ffi.LLVMValueRef]
|
|
ffi.lib.LLVMPY_GetValueKind.restype = c_int
|
|
|
|
ffi.lib.LLVMPY_GetConstantIntRawValue.argtypes = [ffi.LLVMValueRef,
|
|
POINTER(c_bool)]
|
|
ffi.lib.LLVMPY_GetConstantIntRawValue.restype = POINTER(c_uint64)
|
|
|
|
ffi.lib.LLVMPY_GetConstantIntNumWords.argtypes = [ffi.LLVMValueRef]
|
|
ffi.lib.LLVMPY_GetConstantIntNumWords.restype = c_uint
|
|
|
|
ffi.lib.LLVMPY_GetConstantFPValue.argtypes = [ffi.LLVMValueRef,
|
|
POINTER(c_bool)]
|
|
ffi.lib.LLVMPY_GetConstantFPValue.restype = c_double
|