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from collections import namedtuple, defaultdict
import copy
import os
import sys
from itertools import permutations, takewhile
from contextlib import contextmanager
import numpy as np
from llvmlite import ir as llvmir
import llvmlite.llvmpy.core as lc
from llvmlite.llvmpy.core import Type, Constant, LLVMException
import llvmlite.binding as ll
from numba.core import types, utils, typing, datamodel, debuginfo, funcdesc, config, cgutils, imputils
from numba import _dynfunc, _helperlib
from numba.core.compiler_lock import global_compiler_lock
from numba.core.pythonapi import PythonAPI
from import arrayobj
from numba.core.imputils import (user_function, user_generator,
builtin_registry, impl_ret_borrowed,
from numba.cpython import builtins
GENERIC_POINTER = Type.pointer(
class OverloadSelector(object):
An object matching an actual signature against a registry of formal
signatures and choosing the best candidate, if any.
In the current implementation:
- a "signature" is a tuple of type classes or type instances
- the "best candidate" is the most specific match
def __init__(self):
# A list of (formal args tuple, value)
self.versions = []
self._cache = {}
def find(self, sig):
out = self._cache.get(sig)
if out is None:
out = self._find(sig)
self._cache[sig] = out
return out
def _find(self, sig):
candidates = self._select_compatible(sig)
if candidates:
return candidates[self._best_signature(candidates)]
raise NotImplementedError(self, sig)
def _select_compatible(self, sig):
Select all compatible signatures and their implementation.
out = {}
for ver_sig, impl in self.versions:
if self._match_arglist(ver_sig, sig):
out[ver_sig] = impl
return out
def _best_signature(self, candidates):
Returns the best signature out of the candidates
ordered, genericity = self._sort_signatures(candidates)
# check for ambiguous signatures
if len(ordered) > 1:
firstscore = genericity[ordered[0]]
same = list(takewhile(lambda x: genericity[x] == firstscore,
if len(same) > 1:
msg = ["{n} ambiguous signatures".format(n=len(same))]
for sig in same:
msg += ["{0} => {1}".format(sig, candidates[sig])]
raise TypeError('\n'.join(msg))
return ordered[0]
def _sort_signatures(self, candidates):
Sort signatures in ascending level of genericity.
Returns a 2-tuple:
* ordered list of signatures
* dictionary containing genericity scores
# score by genericity
genericity = defaultdict(int)
for this, other in permutations(candidates.keys(), r=2):
matched = self._match_arglist(formal_args=this, actual_args=other)
if matched:
# genericity score +1 for every another compatible signature
genericity[this] += 1
# order candidates in ascending level of genericity
ordered = sorted(candidates.keys(), key=lambda x: genericity[x])
return ordered, genericity
def _match_arglist(self, formal_args, actual_args):
Returns True if the signature is "matching".
A formal signature is "matching" if the actual signature matches exactly
or if the formal signature is a compatible generic signature.
# normalize VarArg
if formal_args and isinstance(formal_args[-1], types.VarArg):
ndiff = len(actual_args) - len(formal_args) + 1
formal_args = formal_args[:-1] + (formal_args[-1].dtype,) * ndiff
if len(formal_args) != len(actual_args):
return False
for formal, actual in zip(formal_args, actual_args):
if not self._match(formal, actual):
return False
return True
def _match(self, formal, actual):
if formal == actual:
# formal argument matches actual arguments
return True
elif types.Any == formal:
# formal argument is any
return True
elif isinstance(formal, type) and issubclass(formal, types.Type):
if isinstance(actual, type) and issubclass(actual, formal):
# formal arg is a type class and actual arg is a subclass
return True
elif isinstance(actual, formal):
# formal arg is a type class of which actual arg is an instance
return True
def append(self, value, sig):
Add a formal signature and its associated value.
assert isinstance(sig, tuple), (value, sig)
self.versions.append((sig, value))
def _load_global_helpers():
Execute once to install special symbols into the LLVM symbol table.
# This is Py_None's real C name
ll.add_symbol("_Py_NoneStruct", id(None))
# Add Numba C helper functions
for c_helpers in (_helperlib.c_helpers, _dynfunc.c_helpers):
for py_name, c_address in c_helpers.items():
c_name = "numba_" + py_name
ll.add_symbol(c_name, c_address)
# Add Numpy C helpers (npy_XXX)
for c_name, c_address in _helperlib.npymath_exports.items():
ll.add_symbol(c_name, c_address)
# Add all built-in exception classes
for obj in utils.builtins.__dict__.values():
if isinstance(obj, type) and issubclass(obj, BaseException):
ll.add_symbol("PyExc_%s" % (obj.__name__), id(obj))
class BaseContext(object):
Notes on Structure
Most objects are lowered as plain-old-data structure in the generated
llvm. They are passed around by reference (a pointer to the structure).
Only POD structure can live across function boundaries by copying the
# True if the target requires strict alignment
# Causes exception to be raised if the record members are not aligned.
strict_alignment = False
# Force powi implementation as math.pow call
implement_powi_as_math_call = False
implement_pow_as_math_call = False
# Emit Debug info
enable_debuginfo = False
DIBuilder = debuginfo.DIBuilder
# Bound checking
def enable_boundscheck(self):
if config.BOUNDSCHECK is not None:
return config.BOUNDSCHECK
return self._boundscheck
def enable_boundscheck(self, value):
self._boundscheck = value
enable_nrt = False
# Auto parallelization
auto_parallel = False
aot_mode = False
# Error model for various operations (only FP exceptions currently)
error_model = None
# Whether dynamic globals (CPU runtime addresses) is allowed
allow_dynamic_globals = False
# Fast math flags
fastmath = False
# python execution environment
environment = None
# the function descriptor
fndesc = None
def __init__(self, typing_context):
self.address_size = utils.MACHINE_BITS
self.typing_context = typing_context
# A mapping of installed registries to their loaders
self._registries = {}
# Declarations loaded from registries and other sources
self._defns = defaultdict(OverloadSelector)
self._getattrs = defaultdict(OverloadSelector)
self._setattrs = defaultdict(OverloadSelector)
self._casts = OverloadSelector()
self._get_constants = OverloadSelector()
# Other declarations
self._generators = {}
self.special_ops = {}
self.cached_internal_func = {}
self._pid = None
self._codelib_stack = []
self._boundscheck = False
self.data_model_manager = datamodel.default_manager
# Initialize
def init(self):
For subclasses to add initializer
def refresh(self):
Refresh context with new declarations from known registries.
Useful for third-party extensions.
# Populate built-in registry
from numba.cpython import (slicing, tupleobj, enumimpl, hashing, heapq,
iterators, numbers, rangeobj)
from numba.core import optional
from numba.misc import gdb_hook, literal
from import linalg, polynomial, arraymath
from import npdatetime
except NotImplementedError:
# Also refresh typing context, since @overload declarations can
# affect it.
def load_additional_registries(self):
Load target-specific registries. Can be overridden by subclasses.
def mangler(self, name, types):
Perform name mangling.
return funcdesc.default_mangler(name, types)
def get_env_name(self, fndesc):
"""Get the environment name given a FunctionDescriptor.
Use this instead of the ``fndesc.env_name`` so that the target-context
can provide necessary mangling of the symbol to meet ABI requirements.
return fndesc.env_name
def declare_env_global(self, module, envname):
"""Declare the Environment pointer as a global of the module.
The pointer is initialized to NULL. It must be filled by the runtime
with the actual address of the Env before the associated function
can be executed.
module :
The LLVM Module
envname : str
The name of the global variable.
if envname not in module.globals:
gv = llvmir.GlobalVariable(module, cgutils.voidptr_t, name=envname)
gv.linkage = 'common'
gv.initializer = cgutils.get_null_value(gv.type.pointee)
return module.globals[envname]
def get_arg_packer(self, fe_args):
return datamodel.ArgPacker(self.data_model_manager, fe_args)
def get_data_packer(self, fe_types):
return datamodel.DataPacker(self.data_model_manager, fe_types)
def target_data(self):
raise NotImplementedError
def nonconst_module_attrs(self):
All module attrs are constant for targets using BaseContext.
return tuple()
def nrt(self):
from numba.core.runtime.context import NRTContext
return NRTContext(self, self.enable_nrt)
def subtarget(self, **kws):
obj = copy.copy(self) # shallow copy
for k, v in kws.items():
if not hasattr(obj, k):
raise NameError("unknown option {0!r}".format(k))
setattr(obj, k, v)
if obj.codegen() is not self.codegen():
# We can't share functions across different codegens
obj.cached_internal_func = {}
return obj
def install_registry(self, registry):
Install a *registry* (a imputils.Registry instance) of function
and attribute implementations.
loader = self._registries[registry]
except KeyError:
loader = RegistryLoader(registry)
self._registries[registry] = loader
def insert_func_defn(self, defns):
for impl, func, sig in defns:
self._defns[func].append(impl, sig)
def _insert_getattr_defn(self, defns):
for impl, attr, sig in defns:
self._getattrs[attr].append(impl, sig)
def _insert_setattr_defn(self, defns):
for impl, attr, sig in defns:
self._setattrs[attr].append(impl, sig)
def _insert_cast_defn(self, defns):
for impl, sig in defns:
self._casts.append(impl, sig)
def _insert_get_constant_defn(self, defns):
for impl, sig in defns:
self._get_constants.append(impl, sig)
def insert_user_function(self, func, fndesc, libs=()):
impl = user_function(fndesc, libs)
self._defns[func].append(impl, impl.signature)
def add_user_function(self, func, fndesc, libs=()):
if func not in self._defns:
msg = "{func} is not a registered user function"
raise KeyError(msg.format(func=func))
impl = user_function(fndesc, libs)
self._defns[func].append(impl, impl.signature)
def insert_generator(self, genty, gendesc, libs=()):
assert isinstance(genty, types.Generator)
impl = user_generator(gendesc, libs)
self._generators[genty] = gendesc, impl
def remove_user_function(self, func):
Remove user function *func*.
KeyError is raised if the function isn't known to us.
del self._defns[func]
def get_external_function_type(self, fndesc):
argtypes = [self.get_argument_type(aty)
for aty in fndesc.argtypes]
# don't wrap in pointer
restype = self.get_argument_type(fndesc.restype)
fnty = Type.function(restype, argtypes)
return fnty
def declare_function(self, module, fndesc):
fnty = self.call_conv.get_function_type(fndesc.restype, fndesc.argtypes)
fn = module.get_or_insert_function(fnty, name=fndesc.mangled_name)
self.call_conv.decorate_function(fn, fndesc.args, fndesc.argtypes, noalias=fndesc.noalias)
if fndesc.inline:
return fn
def declare_external_function(self, module, fndesc):
fnty = self.get_external_function_type(fndesc)
fn = module.get_or_insert_function(fnty, name=fndesc.mangled_name)
assert fn.is_declaration
for ak, av in zip(fndesc.args, fn.args): = "arg.%s" % ak
return fn
def insert_const_string(self, mod, string):
Insert constant *string* (a str object) into module *mod*.
stringtype = GENERIC_POINTER
name = ".const.%s" % string
text = cgutils.make_bytearray(string.encode("utf-8") + b"\x00")
gv = self.insert_unique_const(mod, name, text)
return Constant.bitcast(gv, stringtype)
def insert_const_bytes(self, mod, bytes, name=None):
Insert constant *byte* (a `bytes` object) into module *mod*.
stringtype = GENERIC_POINTER
name = ".bytes.%s" % (name or hash(bytes))
text = cgutils.make_bytearray(bytes)
gv = self.insert_unique_const(mod, name, text)
return Constant.bitcast(gv, stringtype)
def insert_unique_const(self, mod, name, val):
Insert a unique internal constant named *name*, with LLVM value
*val*, into module *mod*.
gv = mod.get_global(name)
except KeyError:
return cgutils.global_constant(mod, name, val)
return gv
def get_argument_type(self, ty):
return self.data_model_manager[ty].get_argument_type()
def get_return_type(self, ty):
return self.data_model_manager[ty].get_return_type()
def get_data_type(self, ty):
Get a LLVM data representation of the Numba type *ty* that is safe
for storage. Record data are stored as byte array.
The return value is a object, or None if the type
is an opaque pointer (???).
return self.data_model_manager[ty].get_data_type()
def get_value_type(self, ty):
return self.data_model_manager[ty].get_value_type()
def pack_value(self, builder, ty, value, ptr, align=None):
Pack value into the array storage at *ptr*.
If *align* is given, it is the guaranteed alignment for *ptr*
(by default, the standard ABI alignment).
dataval = self.data_model_manager[ty].as_data(builder, value), ptr, align=align)
def unpack_value(self, builder, ty, ptr, align=None):
Unpack value from the array storage at *ptr*.
If *align* is given, it is the guaranteed alignment for *ptr*
(by default, the standard ABI alignment).
dm = self.data_model_manager[ty]
return dm.load_from_data_pointer(builder, ptr, align)
def get_constant_generic(self, builder, ty, val):
Return a LLVM constant representing value *val* of Numba type *ty*.
impl = self._get_constants.find((ty,))
return impl(self, builder, ty, val)
except NotImplementedError:
raise NotImplementedError("Cannot lower constant of type '%s'" % (ty,))
def get_constant(self, ty, val):
Same as get_constant_generic(), but without specifying *builder*.
Works only for simple types.
# HACK: pass builder=None to preserve get_constant() API
return self.get_constant_generic(None, ty, val)
def get_constant_undef(self, ty):
lty = self.get_value_type(ty)
return Constant.undef(lty)
def get_constant_null(self, ty):
lty = self.get_value_type(ty)
return Constant.null(lty)
def get_function(self, fn, sig, _firstcall=True):
Return the implementation of function *fn* for signature *sig*.
The return value is a callable with the signature (builder, args).
assert sig is not None
sig = sig.as_function()
if isinstance(fn, (types.Function, types.BoundFunction,
key = fn.get_impl_key(sig)
overloads = self._defns[key]
key = fn
overloads = self._defns[key]
return _wrap_impl(overloads.find(sig.args), self, sig)
except NotImplementedError:
if isinstance(fn, types.Type):
# It's a type instance => try to find a definition for the type class
return self.get_function(type(fn), sig)
except NotImplementedError:
# Raise exception for the type instance, for a better error message
# Automatically refresh the context to load new registries if we are
# calling the first time.
if _firstcall:
return self.get_function(fn, sig, _firstcall=False)
raise NotImplementedError("No definition for lowering %s%s" % (key, sig))
def get_generator_desc(self, genty):
return self._generators[genty][0]
def get_generator_impl(self, genty):
res = self._generators[genty][1]
self.add_linking_libs(getattr(res, 'libs', ()))
return res
def get_bound_function(self, builder, obj, ty):
assert self.get_value_type(ty) == obj.type
return obj
def get_getattr(self, typ, attr):
Get the getattr() implementation for the given type and attribute name.
The return value is a callable with the signature
(context, builder, typ, val, attr).
const_attr = (typ, attr) not in self.nonconst_module_attrs
is_module = isinstance(typ, types.Module)
if is_module and const_attr:
# Implement getattr for module-level globals that we treat as
# constants.
# XXX We shouldn't have to retype this
attrty = self.typing_context.resolve_module_constants(typ, attr)
if attrty is None or isinstance(attrty, types.Dummy):
# No implementation required for dummies (functions, modules...),
# which are dealt with later
return None
pyval = getattr(typ.pymod, attr)
llval = self.get_constant(attrty, pyval)
def imp(context, builder, typ, val, attr):
return impl_ret_borrowed(context, builder, attrty, llval)
return imp
# Lookup specific getattr implementation for this type and attribute
overloads = self._getattrs[attr]
return overloads.find((typ,))
except NotImplementedError:
# Lookup generic getattr implementation for this type
overloads = self._getattrs[None]
return overloads.find((typ,))
except NotImplementedError:
raise NotImplementedError("No definition for lowering %s.%s" % (typ, attr))
def get_setattr(self, attr, sig):
Get the setattr() implementation for the given attribute name
and signature.
The return value is a callable with the signature (builder, args).
assert len(sig.args) == 2
typ = sig.args[0]
valty = sig.args[1]
def wrap_setattr(impl):
def wrapped(builder, args):
return impl(self, builder, sig, args, attr)
return wrapped
# Lookup specific setattr implementation for this type and attribute
overloads = self._setattrs[attr]
return wrap_setattr(overloads.find((typ, valty)))
except NotImplementedError:
# Lookup generic setattr implementation for this type
overloads = self._setattrs[None]
return wrap_setattr(overloads.find((typ, valty)))
except NotImplementedError:
raise NotImplementedError("No definition for lowering %s.%s = %s"
% (typ, attr, valty))
def get_argument_value(self, builder, ty, val):
Argument representation to local value representation
return self.data_model_manager[ty].from_argument(builder, val)
def get_returned_value(self, builder, ty, val):
Return value representation to local value representation
return self.data_model_manager[ty].from_return(builder, val)
def get_return_value(self, builder, ty, val):
Local value representation to return type representation
return self.data_model_manager[ty].as_return(builder, val)
def get_value_as_argument(self, builder, ty, val):
"""Prepare local value representation as argument type representation
return self.data_model_manager[ty].as_argument(builder, val)
def get_value_as_data(self, builder, ty, val):
return self.data_model_manager[ty].as_data(builder, val)
def get_data_as_value(self, builder, ty, val):
return self.data_model_manager[ty].from_data(builder, val)
def pair_first(self, builder, val, ty):
Extract the first element of a heterogeneous pair.
pair = self.make_helper(builder, ty, val)
return pair.first
def pair_second(self, builder, val, ty):
Extract the second element of a heterogeneous pair.
pair = self.make_helper(builder, ty, val)
return pair.second
def cast(self, builder, val, fromty, toty):
Cast a value of type *fromty* to type *toty*.
This implements implicit conversions as can happen due to the
granularity of the Numba type system, or lax Python semantics.
if fromty == toty or toty == types.Any:
return val
impl = self._casts.find((fromty, toty))
return impl(self, builder, fromty, toty, val)
except NotImplementedError:
raise NotImplementedError(
"Cannot cast %s to %s: %s" % (fromty, toty, val))
def generic_compare(self, builder, key, argtypes, args):
Compare the given LLVM values of the given Numba types using
the comparison *key* (e.g. '=='). The values are first cast to
a common safe conversion type.
at, bt = argtypes
av, bv = args
ty = self.typing_context.unify_types(at, bt)
assert ty is not None
cav = self.cast(builder, av, at, ty)
cbv = self.cast(builder, bv, bt, ty)
fnty = self.typing_context.resolve_value_type(key)
# the sig is homogeneous in the unified casted type
cmpsig = fnty.get_call_type(self.typing_context, (ty, ty), {})
cmpfunc = self.get_function(fnty, cmpsig)
self.add_linking_libs(getattr(cmpfunc, 'libs', ()))
return cmpfunc(builder, (cav, cbv))
def make_optional_none(self, builder, valtype):
optval = self.make_helper(builder, types.Optional(valtype))
optval.valid = cgutils.false_bit
return optval._getvalue()
def make_optional_value(self, builder, valtype, value):
optval = self.make_helper(builder, types.Optional(valtype))
optval.valid = cgutils.true_bit = value
return optval._getvalue()
def is_true(self, builder, typ, val):
Return the truth value of a value of the given Numba type.
fnty = self.typing_context.resolve_value_type(bool)
sig = fnty.get_call_type(self.typing_context, (typ,), {})
impl = self.get_function(fnty, sig)
return impl(builder, (val,))
def get_c_value(self, builder, typ, name, dllimport=False):
Get a global value through its C-accessible *name*, with the given
LLVM type.
If *dllimport* is true, the symbol will be marked as imported
from a DLL (necessary for AOT compilation under Windows).
module = builder.function.module
gv = module.get_global_variable_named(name)
except LLVMException:
gv = module.add_global_variable(typ, name)
if dllimport and self.aot_mode and sys.platform == 'win32':
gv.storage_class = "dllimport"
return gv
def call_external_function(self, builder, callee, argtys, args):
args = [self.get_value_as_argument(builder, ty, arg)
for ty, arg in zip(argtys, args)]
retval =, args)
return retval
def get_function_pointer_type(self, typ):
return self.data_model_manager[typ].get_data_type()
def call_function_pointer(self, builder, funcptr, args, cconv=None):
return, args, cconv=cconv)
def print_string(self, builder, text):
mod = builder.module
fnty = Type.function(, [cstring])
puts = mod.get_or_insert_function(fnty, "puts")
return, [text])
def debug_print(self, builder, text):
mod = builder.module
cstr = self.insert_const_string(mod, str(text))
self.print_string(builder, cstr)
def printf(self, builder, format_string, *args):
mod = builder.module
if isinstance(format_string, str):
cstr = self.insert_const_string(mod, format_string)
cstr = format_string
fnty = Type.function(, (GENERIC_POINTER,), var_arg=True)
fn = mod.get_or_insert_function(fnty, "printf")
return, (cstr,) + tuple(args))
def get_struct_type(self, struct):
Get the LLVM struct type for the given Structure class *struct*.
fields = [self.get_value_type(v) for _, v in struct._fields]
return Type.struct(fields)
def get_dummy_value(self):
return Constant.null(self.get_dummy_type())
def get_dummy_type(self):
def _compile_subroutine_no_cache(self, builder, impl, sig, locals={},
Invoke the compiler to compile a function to be used inside a
nopython function, but without generating code to call that
Note this context's flags are not inherited.
# Compile
from numba.core import compiler
with global_compiler_lock:
codegen = self.codegen()
library = codegen.create_library(impl.__name__)
if flags is None:
flags = compiler.Flags()
cres = compiler.compile_internal(self.typing_context, self,
impl, sig.args,
sig.return_type, flags,
# Allow inlining the function inside callers.
return cres
def compile_subroutine(self, builder, impl, sig, locals={}, flags=None,
Compile the function *impl* for the given *sig* (in nopython mode).
Return an instance of CompileResult.
If *caching* evaluates True, the function keeps the compiled function
for reuse in *.cached_internal_func*.
cache_key = (impl.__code__, sig, type(self.error_model))
if not caching:
cached = None
if impl.__closure__:
# XXX This obviously won't work if a cell's value is
# unhashable.
cache_key += tuple(c.cell_contents for c in impl.__closure__)
cached = self.cached_internal_func.get(cache_key)
if cached is None:
cres = self._compile_subroutine_no_cache(builder, impl, sig,
self.cached_internal_func[cache_key] = cres
cres = self.cached_internal_func[cache_key]
# Allow inlining the function inside callers.
return cres
def compile_internal(self, builder, impl, sig, args, locals={}):
Like compile_subroutine(), but also call the function with the given
cres = self.compile_subroutine(builder, impl, sig, locals)
return self.call_internal(builder, cres.fndesc, sig, args)
def call_internal(self, builder, fndesc, sig, args):
Given the function descriptor of an internally compiled function,
emit a call to that function with the given arguments.
status, res = self.call_internal_no_propagate(builder, fndesc, sig, args)
with cgutils.if_unlikely(builder, status.is_error):
self.call_conv.return_status_propagate(builder, status)
res = imputils.fix_returning_optional(self, builder, sig, status, res)
return res
def call_internal_no_propagate(self, builder, fndesc, sig, args):
"""Similar to `.call_internal()` but does not handle or propagate
the return status automatically.
# Add call to the generated function
llvm_mod = builder.module
fn = self.declare_function(llvm_mod, fndesc)
status, res = self.call_conv.call_function(builder, fn, sig.return_type,
sig.args, args)
return status, res
def call_unresolved(self, builder, name, sig, args):
Insert a function call to an unresolved symbol with the given *name*.
Note: this is used for recursive call.
In the mutual recursion case::
def foo():
... # calls bar()
def bar():
... # calls foo()
When foo() is called, the compilation of bar() is fully completed
(codegen'ed and loaded) before foo() is. Since MCJIT's eager compilation
doesn't allow loading modules with declare-only functions (which is
needed for foo() in bar()), the call_unresolved injects a global
variable that the "linker" can update even after the module is loaded by
MCJIT. The linker would allocate space for the global variable before
the bar() module is loaded. When later foo() module is defined, it will
update bar()'s reference to foo().
The legacy lazy JIT and the new ORC JIT would allow a declare-only
function be used in a module as long as it is defined by the time of its
first use.
# Insert an unresolved reference to the function being called.
codegen = self.codegen()
fnty = self.call_conv.get_function_type(sig.return_type, sig.args)
fn = codegen.insert_unresolved_ref(builder, fnty, name)
# Normal call sequence
status, res = self.call_conv.call_function(builder, fn, sig.return_type,
sig.args, args)
with cgutils.if_unlikely(builder, status.is_error):
self.call_conv.return_status_propagate(builder, status)
res = imputils.fix_returning_optional(self, builder, sig, status, res)
return res
def get_executable(self, func, fndesc):
raise NotImplementedError
def get_python_api(self, builder):
return PythonAPI(self, builder)
def sentry_record_alignment(self, rectyp, attr):
Assumes offset starts from a properly aligned location
if self.strict_alignment:
offset = rectyp.offset(attr)
elemty = rectyp.typeof(attr)
align = self.get_abi_alignment(self.get_data_type(elemty))
if offset % align:
msg = "{rec}.{attr} of type {type} is not aligned".format(
rec=rectyp, attr=attr, type=elemty)
raise TypeError(msg)
def get_helper_class(self, typ, kind='value'):
Get a helper class for the given *typ*.
# XXX handle all types: complex, array, etc.
# XXX should it be a method on the model instead? this would allow a default kind...
return cgutils.create_struct_proxy(typ, kind)
def _make_helper(self, builder, typ, value=None, ref=None, kind='value'):
cls = self.get_helper_class(typ, kind)
return cls(self, builder, value=value, ref=ref)
def make_helper(self, builder, typ, value=None, ref=None):
Get a helper object to access the *typ*'s members,
for the given value or reference.
return self._make_helper(builder, typ, value, ref, kind='value')
def make_data_helper(self, builder, typ, ref=None):
As make_helper(), but considers the value as stored in memory,
rather than a live value.
return self._make_helper(builder, typ, ref=ref, kind='data')
def make_array(self, typ):
return arrayobj.make_array(typ)
def populate_array(self, arr, **kwargs):
Populate array structure.
return arrayobj.populate_array(arr, **kwargs)
def make_complex(self, builder, typ, value=None):
Get a helper object to access the given complex numbers' members.
assert isinstance(typ, types.Complex), typ
return self.make_helper(builder, typ, value)
def make_tuple(self, builder, typ, values):
Create a tuple of the given *typ* containing the *values*.
tup = self.get_constant_undef(typ)
for i, val in enumerate(values):
tup = builder.insert_value(tup, val, i)
return tup
def make_constant_array(self, builder, typ, ary):
Create an array structure reifying the given constant array.
A low-level contiguous array constant is created in the LLVM IR.
datatype = self.get_data_type(typ.dtype)
# don't freeze ary of non-contig or bigger than 1MB
size_limit = 10**6
if (self.allow_dynamic_globals and
(typ.layout not in 'FC' or ary.nbytes > size_limit)):
# get pointer from the ary
dataptr =
data = self.add_dynamic_addr(builder, dataptr, info=str(type(dataptr)))
rt_addr = self.add_dynamic_addr(builder, id(ary), info=str(type(ary)))
# Handle data: reify the flattened array in "C" or "F" order as a
# global array of bytes.
flat = ary.flatten(order=typ.layout)
# Note: we use `bytearray(` instead of `bytearray(flat)` to
# workaround issue #1850 which is due to numpy issue #3147
consts = Constant.array(, bytearray(
data = cgutils.global_constant(builder, "", consts)
# Ensure correct data alignment (issue #1933)
data.align = self.get_abi_alignment(datatype)
# No reference to parent ndarray
rt_addr = None
# Handle shape
llintp = self.get_value_type(types.intp)
shapevals = [self.get_constant(types.intp, s) for s in ary.shape]
cshape = Constant.array(llintp, shapevals)
# Handle strides
stridevals = [self.get_constant(types.intp, s) for s in ary.strides]
cstrides = Constant.array(llintp, stridevals)
# Create array structure
cary = self.make_array(typ)(self, builder)
intp_itemsize = self.get_constant(types.intp, ary.dtype.itemsize)
return cary._getvalue()
def add_dynamic_addr(self, builder, intaddr, info):
Returns dynamic address as a void pointer `i8*`.
Internally, a global variable is added to inform the lowerer about
the usage of dynamic addresses. Caching will be disabled.
assert self.allow_dynamic_globals, "dyn globals disabled in this target"
assert isinstance(intaddr, int), 'dyn addr not of int type'
mod = builder.module
llvoidptr = self.get_value_type(types.voidptr)
addr = self.get_constant(types.uintp, intaddr).inttoptr(llvoidptr)
# Use a unique name by embedding the address value
symname = 'numba.dynamic.globals.{:x}'.format(intaddr)
gv = mod.add_global_variable(llvoidptr, name=symname)
# Use linkonce linkage to allow merging with other GV of the same name.
# And, avoid optimization from assuming its value.
gv.linkage = 'linkonce'
gv.initializer = addr
return builder.load(gv)
def get_abi_sizeof(self, ty):
Get the ABI size of LLVM type *ty*.
assert isinstance(ty, llvmir.Type), "Expected LLVM type"
return ty.get_abi_size(self.target_data)
def get_abi_alignment(self, ty):
Get the ABI alignment of LLVM type *ty*.
assert isinstance(ty, llvmir.Type), "Expected LLVM type"
return ty.get_abi_alignment(self.target_data)
def get_preferred_array_alignment(context, ty):
Get preferred array alignment for Numba type *ty*.
# AVX prefers 32-byte alignment
return 32
def post_lowering(self, mod, library):
"""Run target specific post-lowering transformation here.
def create_module(self, name):
"""Create a LLVM module
return lc.Module(name)
def active_code_library(self):
"""Get the active code library
return self._codelib_stack[-1]
def push_code_library(self, lib):
"""Push the active code library for the context
def add_linking_libs(self, libs):
"""Add iterable of linking libraries to the *active_code_library*.
colib = self.active_code_library
for lib in libs:
class _wrap_impl(object):
A wrapper object to call an implementation function with some predefined
(context, signature) arguments.
The wrapper also forwards attribute queries, which is important.
def __init__(self, imp, context, sig):
self._callable = _wrap_missing_loc(imp)
self._imp = self._callable()
self._context = context
self._sig = sig
def __call__(self, builder, args, loc=None):
res = self._imp(self._context, builder, self._sig, args, loc=loc)
self._context.add_linking_libs(getattr(self, 'libs', ()))
return res
def __getattr__(self, item):
return getattr(self._imp, item)
def __repr__(self):
return "<wrapped %s>" % repr(self._callable)
def _has_loc(fn):
"""Does function *fn* take ``loc`` argument?
sig = utils.pysignature(fn)
return 'loc' in sig.parameters
class _wrap_missing_loc(object):
def __init__(self, fn):
self.func = fn # store this to help with debug
def __call__(self):
"""Wrap function for missing ``loc`` keyword argument.
Otherwise, return the original *fn*.
fn = self.func
if not _has_loc(fn):
def wrapper(*args, **kwargs):
kwargs.pop('loc') # drop unused loc
return fn(*args, **kwargs)
# Copy the following attributes from the wrapped.
# Following similar implementation as functools.wraps but
# ignore attributes if not available (i.e fix py2.7)
attrs = '__name__', 'libs'
for attr in attrs:
val = getattr(fn, attr)
except AttributeError:
setattr(wrapper, attr, val)
return wrapper
return fn
def __repr__(self):
return "<wrapped %s>" % self.func
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