"""

RTyper: converts high-level operations into low-level operations in flow graphs.

The main class, with code to walk blocks and dispatch individual operations to

the care of the rtype_*() methods implemented in the other r* modules. For

each high-level operation 'hop', the rtype_*() methods produce low-level

operations that are collected in the 'llops' list defined here. When

necessary, conversions are inserted.

This logic borrows a bit from rpython.annotator.annrpython, without the

fixpoint computation part.

"""

import os

import py, math

from rpython.annotator import model as annmodel, unaryop, binaryop

from rpython.rtyper.llannotation import lltype_to_annotation

from rpython.flowspace.model import Variable, Constant, SpaceOperation

from rpython.rtyper.annlowlevel import (

annotate_lowlevel_helper, LowLevelAnnotatorPolicy)

from rpython.rtyper.error import TyperError

from rpython.rtyper.exceptiondata import ExceptionData

from rpython.rtyper.lltypesystem.lltype import (Signed, Void, LowLevelType,

ContainerType, typeOf, Primitive, getfunctionptr)

from rpython.rtyper.rmodel import Repr, inputconst

from rpython.rtyper import rclass

from rpython.rtyper.rclass import RootClassRepr

from rpython.tool.pairtype import pair

from rpython.translator.unsimplify import insert_empty_block

from rpython.translator.sandbox.rsandbox import make_sandbox_trampoline

class RTyperBackend(object):

pass

class GenCBackend(RTyperBackend):

pass

genc_backend = GenCBackend()

class LLInterpBackend(RTyperBackend):

pass

llinterp_backend = LLInterpBackend()

class RPythonTyper(object):

from rpython.rtyper.rmodel import log

def __init__(self, annotator, backend=genc_backend):

self.annotator = annotator

self.backend = backend

self.lowlevel_ann_policy = LowLevelAnnotatorPolicy(self)

self.reprs = {}

self._reprs_must_call_setup = []

self._seen_reprs_must_call_setup = {}

self._dict_traits = {}

self.rootclass_repr = RootClassRepr(self)

self.rootclass_repr.setup()

self.instance_reprs = {}

self.type_for_typeptr = {}

self.pbc_reprs = {}

self.classes_with_wrapper = {}

self.wrapper_context = None # or add an extra arg to convertvar?

self.classdef_to_pytypeobject = {}

self.concrete_calltables = {}

self.cache_dummy_values = {}

self.lltype2vtable = {}

# make the primitive_to_repr constant mapping

self.primitive_to_repr = {}

self.isinstance_helpers = {}

self.exceptiondata = ExceptionData(self)

self.custom_trace_funcs = []

try:

self.seed = int(os.getenv('RTYPERSEED'))

s = 'Using %d as seed for block shuffling' % self.seed

self.log.info(s)

except:

self.seed = 0

def getconfig(self):

return self.annotator.translator.config

def getprimitiverepr(self, lltype):

try:

return self.primitive_to_repr[lltype]

except KeyError:

pass

if isinstance(lltype, Primitive):

repr = self.primitive_to_repr[lltype] = self.getrepr(lltype_to_annotation(lltype))

return repr

raise TyperError('There is no primitive repr for %r' % (lltype,))

def add_wrapper(self, clsdef):

# record that this class has a wrapper, and what the __init__ is

cls = clsdef.classdesc.pyobj

init = getattr(cls.__init__, 'im_func', None)

self.classes_with_wrapper[cls] = init

def set_wrapper_context(self, obj):

# not nice, but we sometimes need to know which function we are wrapping

self.wrapper_context = obj

def add_pendingsetup(self, repr):

assert isinstance(repr, Repr)

if repr in self._seen_reprs_must_call_setup:

#warning("ignoring already seen repr for setup: %r" %(repr,))

return

self._reprs_must_call_setup.append(repr)

self._seen_reprs_must_call_setup[repr] = True

def lltype_to_classdef_mapping(self):

result = {}

for (classdef, _), repr in self.instance_reprs.iteritems():

result[repr.lowleveltype] = classdef

return result

def get_type_for_typeptr(self, typeptr):

search = typeptr._obj

try:

return self.type_for_typeptr[search]

except KeyError:

# rehash the dictionary, and perform a linear scan

# for the case of ll2ctypes typeptr

found = None

type_for_typeptr = {}

for key, value in self.type_for_typeptr.items():

type_for_typeptr[key] = value

if key == search:

found = value

self.type_for_typeptr = type_for_typeptr

if found is None:

raise KeyError(search)

return found

def set_type_for_typeptr(self, typeptr, TYPE):

self.type_for_typeptr[typeptr._obj] = TYPE

self.lltype2vtable[TYPE] = typeptr

def get_real_typeptr_for_typeptr(self, typeptr):

# perform a linear scan for the case of ll2ctypes typeptr

search = typeptr._obj

for key, value in self.type_for_typeptr.items():

if key == search:

return key._as_ptr()

raise KeyError(search)

def getrepr(self, s_obj):

# s_objs are not hashable... try hard to find a unique key anyway

key = s_obj.rtyper_makekey()

assert key[0] is s_obj.__class__

try:

result = self.reprs[key]

except KeyError:

self.reprs[key] = None

result = s_obj.rtyper_makerepr(self)

assert not isinstance(result.lowleveltype, ContainerType), (

"missing a Ptr in the type specification "

"of %s:\n%r" % (s_obj, result.lowleveltype))

self.reprs[key] = result

self.add_pendingsetup(result)

assert result is not None # recursive getrepr()!

return result

def annotation(self, var):

s_obj = self.annotator.annotation(var)

return s_obj

def binding(self, var):

s_obj = self.annotator.binding(var)

return s_obj

def bindingrepr(self, var):

return self.getrepr(self.binding(var))

def specialize(self, dont_simplify_again=False):

"""Main entry point: specialize all annotated blocks of the program."""

# specialize depends on annotator simplifications

if not dont_simplify_again:

self.annotator.simplify()

self.exceptiondata.finish(self)

# new blocks can be created as a result of specialize_block(), so

# we need to be careful about the loop here.

self.already_seen = {}

self.specialize_more_blocks()

self.exceptiondata.make_helpers(self)

self.specialize_more_blocks() # for the helpers just made

def getannmixlevel(self):

if self.annmixlevel is not None:

return self.annmixlevel

from rpython.rtyper.annlowlevel import MixLevelHelperAnnotator

self.annmixlevel = MixLevelHelperAnnotator(self)

return self.annmixlevel

def specialize_more_blocks(self):

if self.already_seen:

newtext = ' more'

else:

newtext = ''

blockcount = 0

self.annmixlevel = None

while True:

# make sure all reprs so far have had their setup() called

self.call_all_setups()

# look for blocks not specialized yet

pending = [block for block in self.annotator.annotated

if block not in self.already_seen]

if not pending:

break

# shuffle blocks a bit

if self.seed:

import random

r = random.Random(self.seed)

r.shuffle(pending)

previous_percentage = 0

# specialize all blocks in the 'pending' list

for block in pending:

blockcount += 1

self.specialize_block(block)

self.already_seen[block] = True

# progress bar

n = len(self.already_seen)

if n % 100 == 0:

total = len(self.annotator.annotated)

percentage = 100 * n // total

if percentage >= previous_percentage + 5:

previous_percentage = percentage

self.log.event('specializing: %d / %d blocks (%d%%)' %

(n, total, percentage))

self.log.event('-=- specialized %d%s blocks -=-' % (

blockcount, newtext))

annmixlevel = self.annmixlevel

del self.annmixlevel

if annmixlevel is not None:

annmixlevel.finish()

def call_all_setups(self):

# make sure all reprs so far have had their setup() called

must_setup_more = []

delayed = []

while self._reprs_must_call_setup:

r = self._reprs_must_call_setup.pop()

if r.is_setup_delayed():

delayed.append(r)

else:

r.setup()

must_setup_more.append(r)

for r in must_setup_more:

r.setup_final()

self._reprs_must_call_setup.extend(delayed)

def setconcretetype(self, v):

assert isinstance(v, Variable)

v.concretetype = self.bindingrepr(v).lowleveltype

def setup_block_entry(self, block):

if block.operations == () and len(block.inputargs) == 2:

# special case for exception blocks: force them to return an

# exception type and value in a standardized format

v1, v2 = block.inputargs

v1.concretetype = self.exceptiondata.lltype_of_exception_type

v2.concretetype = self.exceptiondata.lltype_of_exception_value

return [self.exceptiondata.r_exception_type,

self.exceptiondata.r_exception_value]

else:

# normal path

result = []

for a in block.inputargs:

r = self.bindingrepr(a)

a.concretetype = r.lowleveltype

result.append(r)

return result

def make_new_lloplist(self, block):

return LowLevelOpList(self, block)

def specialize_block(self, block):

graph = self.annotator.annotated[block]

if graph not in self.annotator.fixed_graphs:

self.annotator.fixed_graphs[graph] = True

# make sure that the return variables of all graphs

# are concretetype'd

self.setconcretetype(graph.getreturnvar())

# give the best possible types to the input args

try:

self.setup_block_entry(block)

except TyperError as e:

self.gottypererror(e, block, "block-entry")

raise

# specialize all the operations, as far as possible

if block.operations == (): # return or except block

return

newops = self.make_new_lloplist(block)

varmapping = {}

for v in block.getvariables():

varmapping[v] = v # records existing Variables

for hop in self.highlevelops(block, newops):

try:

hop.setup() # this is called from here to catch TyperErrors...

self.translate_hl_to_ll(hop, varmapping)

except TyperError as e:

self.gottypererror(e, block, hop.spaceop)

raise

block.operations[:] = newops

block.renamevariables(varmapping)

extrablock = None

pos = newops.llop_raising_exceptions

if (pos is not None and pos != len(newops) - 1):

# this is for the case where the llop that raises the exceptions

# is not the last one in the list.

assert block.canraise

noexclink = block.exits[0]

assert noexclink.exitcase is None

if pos == "removed":

# the exception cannot actually occur at all.

# This is set by calling exception_cannot_occur().

# We just remove all exception links.

block.exitswitch = None

block.exits = block.exits[:1]

else:

# We have to split the block in two, with the exception-catching

# exitswitch after the llop at 'pos', and the extra operations

# in the new part of the block, corresponding to the

# no-exception case. See for example test_rlist.test_indexerror

# or test_rpbc.test_multiple_ll_one_hl_op.

assert 0 <= pos < len(newops) - 1

extraops = block.operations[pos+1:]

del block.operations[pos+1:]

extrablock = insert_empty_block(noexclink, newops=extraops)

if extrablock is None:

self.insert_link_conversions(block)

else:

# skip the extrablock as a link target, its link doesn't need conversions

# by construction, OTOH some of involved vars have no annotation

# so proceeding with it would kill information

self.insert_link_conversions(block, skip=1)

# consider it as a link source instead

self.insert_link_conversions(extrablock)

def _convert_link(self, block, link):

if link.exitcase is not None and link.exitcase != 'default':

if isinstance(block.exitswitch, Variable):

r_case = self.bindingrepr(block.exitswitch)

else:

assert block.canraise

r_case = rclass.get_type_repr(self)

link.llexitcase = r_case.convert_const(link.exitcase)

else:

link.llexitcase = None

a = link.last_exception

if isinstance(a, Variable):

a.concretetype = self.exceptiondata.lltype_of_exception_type

elif isinstance(a, Constant):

link.last_exception = inputconst(

self.exceptiondata.r_exception_type, a.value)

a = link.last_exc_value

if isinstance(a, Variable):

a.concretetype = self.exceptiondata.lltype_of_exception_value

elif isinstance(a, Constant):

link.last_exc_value = inputconst(

self.exceptiondata.r_exception_value, a.value)

def insert_link_conversions(self, block, skip=0):

# insert the needed conversions on the links

can_insert_here = block.exitswitch is None and len(block.exits) == 1

for link in block.exits[skip:]:

self._convert_link(block, link)

inputargs_reprs = self.setup_block_entry(link.target)

newops = self.make_new_lloplist(block)

newlinkargs = {}

for i in range(len(link.args)):

a1 = link.args[i]

r_a2 = inputargs_reprs[i]

if isinstance(a1, Constant):

link.args[i] = inputconst(r_a2, a1.value)

continue # the Constant was typed, done

if a1 is link.last_exception:

r_a1 = self.exceptiondata.r_exception_type

elif a1 is link.last_exc_value:

r_a1 = self.exceptiondata.r_exception_value

else:

r_a1 = self.bindingrepr(a1)

if r_a1 == r_a2:

continue # no conversion needed

try:

new_a1 = newops.convertvar(a1, r_a1, r_a2)

except TyperError as e:

self.gottypererror(e, block, link)

raise

if new_a1 != a1:

newlinkargs[i] = new_a1

if newops:

if can_insert_here:

block.operations.extend(newops)

else:

# cannot insert conversion operations around a single

# link, unless it is the only exit of this block.

# create a new block along the link...

newblock = insert_empty_block(link,

# ...and store the conversions there.

newops=newops)

link = newblock.exits[0]

for i, new_a1 in newlinkargs.items():

link.args[i] = new_a1

def highlevelops(self, block, llops):

# enumerate the HighLevelOps in a block.

if block.operations:

for op in block.operations[:-1]:

yield HighLevelOp(self, op, [], llops)

# look for exception links for the last operation

if block.canraise:

exclinks = block.exits[1:]

else:

exclinks = []

yield HighLevelOp(self, block.operations[-1], exclinks, llops)

def translate_hl_to_ll(self, hop, varmapping):

#self.log.translating(hop.spaceop.opname, hop.args_s)

resultvar = hop.dispatch()

if hop.exceptionlinks and hop.llops.llop_raising_exceptions is None:

raise TyperError("the graph catches %s, but the rtyper did not "

"take exceptions into account "

"(exception_is_here() not called)" % (

[link.exitcase.__name__ for link in hop.exceptionlinks],))

if resultvar is None:

# no return value

self.translate_no_return_value(hop)

else:

assert isinstance(resultvar, (Variable, Constant))

op = hop.spaceop

# for simplicity of the translate_meth, resultvar is usually not

# op.result here. We have to replace resultvar with op.result

# in all generated operations.

if hop.s_result.is_constant():

if isinstance(resultvar, Constant) and \

isinstance(hop.r_result.lowleveltype, Primitive) and \

hop.r_result.lowleveltype is not Void:

# assert that they are equal, or both are 'nan'

assert resultvar.value == hop.s_result.const or (

math.isnan(resultvar.value) and

math.isnan(hop.s_result.const))

resulttype = resultvar.concretetype

op.result.concretetype = hop.r_result.lowleveltype

if op.result.concretetype != resulttype:

raise TyperError("inconsistent type for the result of '%s':\n"

"annotator says %s,\n"

"whose repr is %r\n"

"but rtype_%s returned %r" % (

op.opname, hop.s_result,

hop.r_result, op.opname, resulttype))

# figure out if the resultvar is a completely fresh Variable or not

if (isinstance(resultvar, Variable) and

resultvar.annotation is None and

resultvar not in varmapping):

# fresh Variable: rename it to the previously existing op.result

varmapping[resultvar] = op.result

elif resultvar is op.result:

# special case: we got the previous op.result Variable again

assert varmapping[resultvar] is resultvar

else:

# renaming unsafe. Insert a 'same_as' operation...

hop.llops.append(SpaceOperation('same_as', [resultvar],

op.result))

def translate_no_return_value(self, hop):

op = hop.spaceop

if hop.s_result != annmodel.s_ImpossibleValue:

raise TyperError("the annotator doesn't agree that '%s' "

"has no return value" % op.opname)

op.result.concretetype = Void

def gottypererror(self, exc, block, position):

"""Record information about the location of a TyperError"""

graph = self.annotator.annotated.get(block)

exc.where = (graph, block, position)

# __________ regular operations __________

def _registeroperations(cls, unary_ops, binary_ops):

d = {}

# All unary operations

for opname in unary_ops:

fnname = 'translate_op_' + opname

exec py.code.compile("""

def translate_op_%s(self, hop):

r_arg1 = hop.args_r[0]

return r_arg1.rtype_%s(hop)

""" % (opname, opname)) in globals(), d

setattr(cls, fnname, d[fnname])

# All binary operations

for opname in binary_ops:

fnname = 'translate_op_' + opname

exec py.code.compile("""

def translate_op_%s(self, hop):

r_arg1 = hop.args_r[0]

r_arg2 = hop.args_r[1]

return pair(r_arg1, r_arg2).rtype_%s(hop)

""" % (opname, opname)) in globals(), d

setattr(cls, fnname, d[fnname])

_registeroperations = classmethod(_registeroperations)

# this one is not in BINARY_OPERATIONS

def translate_op_contains(self, hop):

r_arg1 = hop.args_r[0]

r_arg2 = hop.args_r[1]

return pair(r_arg1, r_arg2).rtype_contains(hop)

# __________ irregular operations __________

def translate_op_newlist(self, hop):

return rlist.rtype_newlist(hop)

def translate_op_newdict(self, hop):

return rdict.rtype_newdict(hop)

def translate_op_alloc_and_set(self, hop):

return rlist.rtype_alloc_and_set(hop)

def translate_op_extend_with_str_slice(self, hop):

r_arg1 = hop.args_r[0]

r_arg2 = hop.args_r[3]

return pair(r_arg1, r_arg2).rtype_extend_with_str_slice(hop)

def translate_op_extend_with_char_count(self, hop):

r_arg1 = hop.args_r[0]

r_arg2 = hop.args_r[1]

return pair(r_arg1, r_arg2).rtype_extend_with_char_count(hop)

def translate_op_newtuple(self, hop):

from rpython.rtyper.rtuple import rtype_newtuple

return rtype_newtuple(hop)

def translate_op_instantiate1(self, hop):

if not isinstance(hop.s_result, annmodel.SomeInstance):

raise TyperError("instantiate1 got s_result=%r" % (hop.s_result,))

classdef = hop.s_result.classdef

return rclass.rtype_new_instance(self, classdef, hop.llops)

def default_translate_operation(self, hop):

raise TyperError("unimplemented operation: '%s'" % hop.spaceop.opname)

# __________ utilities __________

def needs_wrapper(self, cls):

return cls in self.classes_with_wrapper

def get_wrapping_hint(self, clsdef):

cls = clsdef.classdesc.pyobj

return self.classes_with_wrapper[cls], self.wrapper_context

def getcallable(self, graph):

def getconcretetype(v):

return self.bindingrepr(v).lowleveltype

if self.annotator.translator.config.translation.sandbox:

try:

name = graph.func._sandbox_external_name

except AttributeError:

pass

else:

args_s = [v.annotation for v in graph.getargs()]

s_result = graph.getreturnvar().annotation

sandboxed = make_sandbox_trampoline(name, args_s, s_result)

return self.getannmixlevel().delayedfunction(

sandboxed, args_s, s_result)

return getfunctionptr(graph, getconcretetype)

def annotate_helper(self, ll_function, argtypes):

"""Annotate the given low-level helper function and return its graph

"""

args_s = []

for s in argtypes:

# assume 's' is a low-level type, unless it is already an annotation

if not isinstance(s, annmodel.SomeObject):

s = lltype_to_annotation(s)

args_s.append(s)

# hack for bound methods

if hasattr(ll_function, 'im_func'):

bk = self.annotator.bookkeeper

args_s.insert(0, bk.immutablevalue(ll_function.im_self))

ll_function = ll_function.im_func

helper_graph = annotate_lowlevel_helper(self.annotator,

ll_function, args_s,

policy=self.lowlevel_ann_policy)

return helper_graph

def annotate_helper_fn(self, ll_function, argtypes):

"""Annotate the given low-level helper function

and return it as a function pointer

"""

graph = self.annotate_helper(ll_function, argtypes)

return self.getcallable(graph)

# register operations from annotation model

RPythonTyper._registeroperations(unaryop.UNARY_OPERATIONS, binaryop.BINARY_OPERATIONS)

# ____________________________________________________________

class HighLevelOp(object):

def __init__(self, rtyper, spaceop, exceptionlinks, llops):

self.rtyper = rtyper

self.spaceop = spaceop

self.exceptionlinks = exceptionlinks

self.llops = llops

def setup(self):

rtyper = self.rtyper

spaceop = self.spaceop

self.args_v = list(spaceop.args)

self.args_s = [rtyper.binding(a) for a in spaceop.args]

self.s_result = rtyper.binding(spaceop.result)

self.args_r = [rtyper.getrepr(s_a) for s_a in self.args_s]

self.r_result = rtyper.getrepr(self.s_result)

rtyper.call_all_setups() # compute ForwardReferences now

@property

def nb_args(self):

return len(self.args_v)

def copy(self):

result = HighLevelOp(self.rtyper, self.spaceop,

self.exceptionlinks, self.llops)

for key, value in self.__dict__.items():

if type(value) is list: # grunt

value = value[:]

setattr(result, key, value)

return result

def dispatch(self):

rtyper = self.rtyper

opname = self.spaceop.opname

translate_meth = getattr(rtyper, 'translate_op_' + opname,

rtyper.default_translate_operation)

return translate_meth(self)

def inputarg(self, converted_to, arg):

"""Returns the arg'th input argument of the current operation,

as a Variable or Constant converted to the requested type.

'converted_to' should be a Repr instance or a Primitive low-level

type.

"""

if not isinstance(converted_to, Repr):

converted_to = self.rtyper.getprimitiverepr(converted_to)

v = self.args_v[arg]

if isinstance(v, Constant):

return inputconst(converted_to, v.value)

assert hasattr(v, 'concretetype')

s_binding = self.args_s[arg]

if s_binding.is_constant():

return inputconst(converted_to, s_binding.const)

r_binding = self.args_r[arg]

return self.llops.convertvar(v, r_binding, converted_to)

inputconst = staticmethod(inputconst) # export via the HighLevelOp class

def inputargs(self, *converted_to):

if len(converted_to) != self.nb_args:

raise TyperError("operation argument count mismatch:\n"

"'%s' has %d arguments, rtyper wants %d" % (

self.spaceop.opname, self.nb_args, len(converted_to)))

vars = []

for i in range(len(converted_to)):

vars.append(self.inputarg(converted_to[i], i))

return vars

def genop(self, opname, args_v, resulttype=None):

return self.llops.genop(opname, args_v, resulttype)

def gendirectcall(self, ll_function, *args_v):

return self.llops.gendirectcall(ll_function, *args_v)

def r_s_pop(self, index=-1):

"Return and discard the argument with index position."

self.args_v.pop(index)

return self.args_r.pop(index), self.args_s.pop(index)

def r_s_popfirstarg(self):

"Return and discard the first argument."

return self.r_s_pop(0)

def v_s_insertfirstarg(self, v_newfirstarg, s_newfirstarg):

r_newfirstarg = self.rtyper.getrepr(s_newfirstarg)

self.args_v.insert(0, v_newfirstarg)

self.args_r.insert(0, r_newfirstarg)

self.args_s.insert(0, s_newfirstarg)

def swap_fst_snd_args(self):

self.args_v[0], self.args_v[1] = self.args_v[1], self.args_v[0]

self.args_s[0], self.args_s[1] = self.args_s[1], self.args_s[0]

self.args_r[0], self.args_r[1] = self.args_r[1], self.args_r[0]

def has_implicit_exception(self, exc_cls):

if self.llops.llop_raising_exceptions is not None:

raise TyperError("already generated the llop that raises the "

"exception")

if not self.exceptionlinks:

return False # don't record has_implicit_exception checks on

# high-level ops before the last one in the block

if self.llops.implicit_exceptions_checked is None:

self.llops.implicit_exceptions_checked = []

result = False

for link in self.exceptionlinks:

if issubclass(exc_cls, link.exitcase):

self.llops.implicit_exceptions_checked.append(link.exitcase)

result = True

# go on looping to add possibly more exceptions to the list

# (e.g. Exception itself - see test_rlist.test_valueerror)

return result

def exception_is_here(self):

self.llops._called_exception_is_here_or_cannot_occur = True

if self.llops.llop_raising_exceptions is not None:

raise TyperError("cannot catch an exception at more than one llop")

if not self.exceptionlinks:

return # ignored for high-level ops before the last one in the block

if self.llops.implicit_exceptions_checked is not None:

# sanity check: complain if an has_implicit_exception() check is

# missing in the rtyper.

for link in self.exceptionlinks:

if link.exitcase not in self.llops.implicit_exceptions_checked:

raise TyperError("the graph catches %s, but the rtyper "

"did not explicitely handle it" % (

link.exitcase.__name__,))

self.llops.llop_raising_exceptions = len(self.llops)

def exception_cannot_occur(self):

self.llops._called_exception_is_here_or_cannot_occur = True

if self.llops.llop_raising_exceptions is not None:

raise TyperError("cannot catch an exception at more than one llop")

if not self.exceptionlinks:

return # ignored for high-level ops before the last one in the block

self.llops.llop_raising_exceptions = "removed"

def decompose_slice_args(self):

# Select which kind of slicing is needed. We support:

# * [start:]

# * [start:stop]

# * [:-1]

s_start = self.args_s[1]

s_stop = self.args_s[2]

if (s_start.is_constant() and s_start.const in (None, 0) and

s_stop.is_constant() and s_stop.const == -1):

return "minusone", []

if isinstance(s_start, annmodel.SomeInteger):

if not s_start.nonneg:

raise TyperError("slice start must be proved non-negative")

if isinstance(s_stop, annmodel.SomeInteger):

if not s_stop.nonneg:

raise TyperError("slice stop must be proved non-negative")

if s_start.is_constant() and s_start.const is None:

v_start = inputconst(Signed, 0)

else:

v_start = self.inputarg(Signed, arg=1)

if s_stop.is_constant() and s_stop.const is None:

return "startonly", [v_start]

else:

v_stop = self.inputarg(Signed, arg=2)

return "startstop", [v_start, v_stop]

# ____________________________________________________________

class LowLevelOpList(list):

"""A list with gen*() methods to build and append low-level

operations to it.

"""

# NB. the following two attributes are here instead of on HighLevelOp

# because we want them to be shared between a HighLevelOp and its

# copy()es.

llop_raising_exceptions = None

implicit_exceptions_checked = None

def __init__(self, rtyper=None, originalblock=None):

self.rtyper = rtyper

self.originalblock = originalblock

def getparentgraph(self):

return self.rtyper.annotator.annotated[self.originalblock]

def hasparentgraph(self):

return self.originalblock is not None

def record_extra_call(self, graph):

if self.hasparentgraph():

self.rtyper.annotator.translator.update_call_graph(

caller_graph = self.getparentgraph(),

callee_graph = graph,

position_tag = object())

def convertvar(self, orig_v, r_from, r_to):

assert isinstance(orig_v, (Variable, Constant))

if r_from != r_to:

v = pair(r_from, r_to).convert_from_to(orig_v, self)

if v is NotImplemented:

raise TyperError("don't know how to convert from %r to %r" %

(r_from, r_to))

if v.concretetype != r_to.lowleveltype:

raise TyperError("bug in conversion from %r to %r: "

"returned a %r" % (r_from, r_to,

v.concretetype))

else:

v = orig_v

return v

def genop(self, opname, args_v, resulttype=None):

try:

for v in args_v:

v.concretetype

except AttributeError:

raise AssertionError("wrong level! you must call hop.inputargs()"

" and pass its result to genop(),"

" never hop.args_v directly.")

vresult = Variable()

self.append(SpaceOperation(opname, args_v, vresult))

if resulttype is None:

vresult.concretetype = Void

return None

else:

if isinstance(resulttype, Repr):

resulttype = resulttype.lowleveltype

assert isinstance(resulttype, LowLevelType)

vresult.concretetype = resulttype

return vresult

def gendirectcall(self, ll_function, *args_v):

rtyper = self.rtyper

args_s = []

newargs_v = []

with rtyper.annotator.using_policy(rtyper.lowlevel_ann_policy):

for v in args_v:

if v.concretetype is Void:

s_value = rtyper.annotation(v)

if s_value is None:

s_value = annmodel.s_None

if not s_value.is_constant():

raise TyperError("non-constant variable of type Void")

if not isinstance(s_value, (annmodel.SomePBC, annmodel.SomeNone)):

raise TyperError("non-PBC Void argument: %r", (s_value,))

args_s.append(s_value)

else:

args_s.append(lltype_to_annotation(v.concretetype))

newargs_v.append(v)

self.rtyper.call_all_setups() # compute ForwardReferences now

# hack for bound methods

if hasattr(ll_function, 'im_func'):

bk = rtyper.annotator.bookkeeper

args_s.insert(0, bk.immutablevalue(ll_function.im_self))

newargs_v.insert(0, inputconst(Void, ll_function.im_self))

ll_function = ll_function.im_func

graph = annotate_lowlevel_helper(rtyper.annotator, ll_function, args_s,

rtyper.lowlevel_ann_policy)

self.record_extra_call(graph)

# build the 'direct_call' operation

f = self.rtyper.getcallable(graph)

c = inputconst(typeOf(f), f)

fobj = f._obj

return self.genop('direct_call', [c]+newargs_v,

resulttype = typeOf(fobj).RESULT)

def genconst(self, ll_value):

return inputconst(typeOf(ll_value), ll_value)

def genvoidconst(self, placeholder):

return inputconst(Void, placeholder)

def constTYPE(self, T):

return T

# _______________________________________________________________________

# this has the side-effect of registering the unary and binary operations

# and the rtyper_chooserepr() methods

from rpython.rtyper import rint, rbool, rfloat, rnone

from rpython.rtyper import rrange

from rpython.rtyper import rstr, rdict, rlist, rbytearray

from rpython.rtyper import rbuiltin, rpbc

from rpython.rtyper import rptr

from rpython.rtyper import rweakref

from rpython.rtyper import raddress # memory addresses