def callAtom(self, atom, arguments, namedArgsMap):
"""
This method is used to reuse atoms without having to rebuild them.
"""
# Promote the atom, on the basis that atoms are generally reused.
atom = promote(atom)
# Log the atom to the JIT log. Don't do this if the atom's not
# promoted; it'll be slow.
jit_debug(atom.repr)
try:
return self.recvNamed(atom, arguments, namedArgsMap)
except Refused as r:
addTrail(r, self, atom, arguments)
raise
except UserException as ue:
addTrail(ue, self, atom, arguments)
raise
except MemoryError:
ue = userError(u"Memory corruption or exhausted heap")
addTrail(ue, self, atom, arguments)
raise ue
except StackOverflow:
check_stack_overflow()
ue = userError(u"Stack overflow")
addTrail(ue, self, atom, arguments)
raise ue
def _interpret(self, space, pc, frame, bytecode):
prev_instr = frame.last_instr
frame.last_instr = pc
if (space.getexecutioncontext().hastraceproc()
and bytecode.lineno_table[pc] !=
bytecode.lineno_table[prev_instr]):
space.getexecutioncontext().invoke_trace_proc(space,
"line",
None,
None,
frame=frame)
try:
pc = self.handle_bytecode(space, pc, frame, bytecode)
except RubyError as e:
pc = self.handle_ruby_error(space, pc, frame, bytecode, e)
except RaiseReturn as e:
pc = self.handle_raise_return(space, pc, frame, bytecode, e)
except RaiseBreak as e:
pc = self.handle_raise_break(space, pc, frame, bytecode, e)
except Throw as e:
pc = self.handle_throw(space, pc, frame, bytecode, e)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
pc = self.handle_ruby_error(
space, pc, frame, bytecode,
space.error(space.w_SystemStackError, "stack level too deep"))
return pc
def dump_w_obj(self, w_obj):
space = self.space
try:
self.put_w_obj(w_obj)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def dump_w_obj(self, w_obj):
space = self.space
try:
self.put_w_obj(w_obj)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def dump_w_obj(self, w_obj):
space = self.space
if (space.type(w_obj).is_heaptype() and
space.lookup(w_obj, "__buffer__") is None):
w_err = space.wrap("only builtins can be marshaled")
raise OperationError(space.w_ValueError, w_err)
try:
self.put_w_obj(w_obj)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def handle_exception(self, space, e):
try:
if not we_are_translated():
raise
raise e
except KeyboardInterrupt:
raise OperationError(space.w_KeyboardInterrupt, space.w_None)
except MemoryError:
raise OperationError(space.w_MemoryError, space.w_None)
except rstackovf.StackOverflow, e:
rstackovf.check_stack_overflow()
raise OperationError(space.w_RuntimeError, space.wrap("maximum recursion depth exceeded"))
def load_w_obj(self, allow_null=False):
try:
return self._get_w_obj(allow_null)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
except OperationError as e:
if not e.match(self.space, self.space.w_RecursionError):
raise
# somebody else has already converted the rpython overflow error to
# an OperationError (e.g. one of che space.call* calls in
# marshal_impl), turn it into a ValueError
self._overflow()
def handle_exception(self, space, e):
try:
if not we_are_translated():
raise
raise e
except KeyboardInterrupt:
raise OperationError(space.w_KeyboardInterrupt, space.w_None)
except MemoryError:
raise OperationError(space.w_MemoryError, space.w_None)
except rstackovf.StackOverflow, e:
rstackovf.check_stack_overflow()
raise OperationError(
space.w_RuntimeError,
space.wrap("maximum recursion depth exceeded"))
def dump_w_obj(self, w_obj):
space = self.space
if space.type(w_obj).is_heaptype():
try:
buf = space.readbuf_w(w_obj)
except OperationError as e:
if not e.match(space, space.w_TypeError):
raise
self.raise_exc("unmarshallable object")
else:
w_obj = space.newbuffer(buf)
try:
self.put_w_obj(w_obj)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def dump_w_obj(self, w_obj):
space = self.space
if space.type(w_obj).is_heaptype():
try:
buf = space.readbuf_w(w_obj)
except OperationError as e:
if not e.match(space, space.w_TypeError):
raise
self.raise_exc("unmarshallable object")
else:
w_obj = space.newbuffer(buf)
try:
self.put_w_obj(w_obj)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def stack_frame(self, s_frame, s_sender, may_context_switch=True):
if self.is_tracing():
self.stack_depth += 1
vref = s_frame.enter_virtual_frame(s_sender)
try:
self.loop_bytecodes(s_frame, may_context_switch)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
raise StackOverflow(s_frame)
except LocalReturn, ret:
if s_frame.get_state() is DirtyContext:
s_new_sender = s_frame.s_sender() # The sender has changed!
s_frame._activate_unwind_context(self)
raise NonVirtualReturn(s_new_sender, s_new_sender, ret.value(self.space))
else:
s_frame._activate_unwind_context(self)
raise ret
def stack_frame(self, s_frame, s_sender, may_context_switch):
if self.is_tracing():
self.stack_depth += 1
vref = s_frame.enter_virtual_frame(s_sender)
try:
self.loop_bytecodes(s_frame, may_context_switch)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
raise StackOverflow(s_frame)
except LocalReturn, ret:
if s_frame.get_state() is DirtyContext:
s_new_sender = s_frame.s_sender() # The sender has changed!
s_frame._activate_unwind_context(self)
raise NonVirtualReturn(s_new_sender, s_new_sender, ret.value(self.space))
else:
s_frame._activate_unwind_context(self)
raise ret
def get_converted_unexpected_exception(space, e):
"""This is used in two places when we get an non-OperationError
RPython exception: from gateway.py when calling an interp-level
function raises; and from pyopcode.py when we're exiting the
interpretation of the frame with an exception. Note that it
*cannot* be used in pyopcode.py: that place gets a
ContinueRunningNormally exception from the JIT, which must not end
up here!
"""
try:
if not we_are_translated():
raise
raise e
except KeyboardInterrupt:
return OperationError(space.w_KeyboardInterrupt, space.w_None)
except MemoryError:
return OperationError(space.w_MemoryError, space.w_None)
except rstackovf.StackOverflow as e:
# xxx twisted logic which happens to give the result that we
# want: when untranslated, a RuntimeError or its subclass
# NotImplementedError is caught here. Then
# check_stack_overflow() will re-raise it directly. We see
# the result as this exception propagates directly. But when
# translated, an RPython-level RuntimeError is turned into
# an app-level RuntimeError by the next case.
rstackovf.check_stack_overflow()
return oefmt(space.w_RecursionError,
"maximum recursion depth exceeded")
except RuntimeError: # not on top of py.py
return OperationError(space.w_RuntimeError, space.w_None)
except:
if we_are_translated():
from rpython.rlib.debug import debug_print_traceback
debug_print_traceback()
extra = '; internal traceback was dumped to stderr'
else:
# when untranslated, we don't wrap into an app-level
# SystemError (this makes debugging tests harder)
raise
return OperationError(
space.w_SystemError,
space.newtext(
"unexpected internal exception (please report a bug): %r%s" %
(e, extra)))
def get_converted_unexpected_exception(space, e):
"""This is used in two places when we get an non-OperationError
RPython exception: from gateway.py when calling an interp-level
function raises; and from pyopcode.py when we're exiting the
interpretation of the frame with an exception. Note that it
*cannot* be used in pyopcode.py: that place gets a
ContinueRunningNormally exception from the JIT, which must not end
up here!
"""
try:
if not we_are_translated():
raise
raise e
except KeyboardInterrupt:
return OperationError(space.w_KeyboardInterrupt, space.w_None)
except MemoryError:
return OperationError(space.w_MemoryError, space.w_None)
except rstackovf.StackOverflow as e:
# xxx twisted logic which happens to give the result that we
# want: when untranslated, a RuntimeError or its subclass
# NotImplementedError is caught here. Then
# check_stack_overflow() will re-raise it directly. We see
# the result as this exception propagates directly. But when
# translated, an RPython-level RuntimeError is turned into
# an app-level RuntimeError by the next case.
rstackovf.check_stack_overflow()
return oefmt(space.w_RuntimeError, "maximum recursion depth exceeded")
except RuntimeError: # not on top of py.py
return OperationError(space.w_RuntimeError, space.w_None)
except:
if we_are_translated():
from rpython.rlib.debug import debug_print_traceback
debug_print_traceback()
extra = "; internal traceback was dumped to stderr"
else:
# when untranslated, we don't wrap into an app-level
# SystemError (this makes debugging tests harder)
raise
return OperationError(
space.w_SystemError, space.wrap("unexpected internal exception (please report a bug): %r%s" % (e, extra))
)
def _interpret(self, space, pc, frame, bytecode):
prev_instr = frame.last_instr
frame.last_instr = pc
if (space.getexecutioncontext().hastraceproc() and
bytecode.lineno_table[pc] != bytecode.lineno_table[prev_instr]):
space.getexecutioncontext().invoke_trace_proc(space, "line", None, None, frame=frame)
try:
pc = self.handle_bytecode(space, pc, frame, bytecode)
except RubyError as e:
pc = self.handle_ruby_error(space, pc, frame, bytecode, e)
except RaiseReturn as e:
pc = self.handle_raise_return(space, pc, frame, bytecode, e)
except RaiseBreak as e:
pc = self.handle_raise_break(space, pc, frame, bytecode, e)
except Throw as e:
pc = self.handle_throw(space, pc, frame, bytecode, e)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
pc = self.handle_ruby_error(space, pc, frame, bytecode, space.error(space.w_SystemStackError, "stack level too deep"))
return pc
def stack_frame(self, s_frame, s_sender, may_context_switch=True):
try:
if self.is_tracing():
self.stack_depth += 1
if s_frame._s_sender is None and s_sender is not None:
s_frame.store_s_sender(s_sender)
# Now (continue to) execute the context bytecodes
# assert s_frame.state is InactiveContext
s_frame.state = ActiveContext
self.loop_bytecodes(s_frame, may_context_switch)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
raise StackOverflow(s_frame)
except LocalReturn, ret:
if s_frame.state is DirtyContext:
s_sender = s_frame.s_sender() # The sender has changed!
s_frame._activate_unwind_context(self)
raise NonVirtualReturn(s_sender, s_sender, ret.value(self.space))
else:
s_frame._activate_unwind_context(self)
raise ret
def callAtom(self, atom, arguments, namedArgsMap=None, span=None):
"""
This method is used to reuse atoms without having to rebuild them.
This is the correct method to call if you have an atom.
"""
# Promote the atom, on the basis that atoms are generally reused.
atom = promote(atom)
# Log the atom to the JIT log. Don't do this if the atom's not
# promoted; it'll be slow.
jit_debug(atom.repr)
if namedArgsMap is None or namedArgsMap.isEmpty():
namedArgsMap = MIRANDA_MAP
else:
from typhon.objects.collections.maps import ConstMap
namedArgsMap = ConstMap(namedArgsMap._or(MIRANDA_ARGS))
try:
return self.recvNamed(atom, arguments, namedArgsMap)
except Refused as r:
r.addTrail(self, atom, arguments, span)
raise
except UserException as ue:
ue.addTrail(self, atom, arguments, span)
raise
except MemoryError:
ue = userError(u"Memory corruption or exhausted heap")
ue.addTrail(self, atom, arguments, span)
raise ue
except StackOverflow:
check_stack_overflow()
ue = userError(u"Stack overflow")
ue.addTrail(self, atom, arguments, span)
raise ue
def stack_frame(self, s_frame, s_sender, may_context_switch=True):
try:
if self.is_tracing():
self.stack_depth += 1
if s_frame._s_sender is None and s_sender is not None:
s_frame.store_s_sender(s_sender)
# Now (continue to) execute the context bytecodes
# assert s_frame.state is InactiveContext
s_frame.state = ActiveContext
self.loop_bytecodes(s_frame, may_context_switch)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
raise StackOverflow(s_frame)
except Return, ret:
if s_frame.state is DirtyContext:
s_sender = s_frame.s_sender() # The sender has changed!
s_frame._activate_unwind_context(self)
target_context = s_sender if ret.is_local else ret.s_target_context
raise NonVirtualReturn(target_context, s_sender, ret.value)
else:
s_frame._activate_unwind_context(self)
if ret.is_local or ret.s_target_context is s_sender:
ret.arrived_at_target = True
raise ret
def callAtom(self, atom, arguments, namedArgsMap=None, span=None):
"""
This method is used to reuse atoms without having to rebuild them.
This is the correct method to call if you have an atom.
"""
# Promote the atom, on the basis that atoms are generally reused.
atom = promote(atom)
# Log the atom to the JIT log. Don't do this if the atom's not
# promoted; it'll be slow.
jit_debug(atom.repr)
if namedArgsMap is None or namedArgsMap.isEmpty():
namedArgsMap = MIRANDA_MAP
else:
from typhon.objects.collections.maps import ConstMap
namedArgsMap = ConstMap(namedArgsMap._or(MIRANDA_ARGS))
try:
return self.recvNamed(atom, arguments, namedArgsMap)
except Refused as r:
r.addTrail(self, atom, arguments, span)
raise
except UserException as ue:
ue.addTrail(self, atom, arguments, span)
raise
except MemoryError:
ue = userError(u"Memory corruption or exhausted heap")
ue.addTrail(self, atom, arguments, span)
raise ue
except StackOverflow:
check_stack_overflow()
ue = userError(u"Stack overflow")
ue.addTrail(self, atom, arguments, span)
raise ue
def load_w_obj(self):
try:
return self.get_w_obj()
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def load_w_obj(self):
try:
return self.get_w_obj()
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def callAtom(self, atom, arguments, namedArgsMap):
"""
This method is used to reuse atoms without having to rebuild them.
"""
from typhon.objects.collections.maps import EMPTY_MAP
# Promote the atom, on the basis that atoms are generally reused.
atom = promote(atom)
# Log the atom to the JIT log. Don't do this if the atom's not
# promoted; it'll be slow.
jit_debug(atom.repr)
try:
return self.recvNamed(atom, arguments, namedArgsMap)
except Refused as r:
# This block of method implementations is Typhon's Miranda
# protocol. ~ C.
if atom is _CONFORMTO_1:
# Welcome to _conformTo/1.
# to _conformTo(_): return self
return self
if atom is _GETALLEGEDINTERFACE_0:
# Welcome to _getAllegedInterface/0.
interface = self.optInterface()
if interface is None:
from typhon.objects.interfaces import ComputedInterface
interface = ComputedInterface(self)
return interface
if atom is _PRINTON_1:
# Welcome to _printOn/1.
from typhon.objects.constants import NullObject
self.printOn(arguments[0])
return NullObject
if atom is _RESPONDSTO_2:
from typhon.objects.constants import wrapBool
from typhon.objects.data import unwrapInt, unwrapStr
verb = unwrapStr(arguments[0])
arity = unwrapInt(arguments[1])
atom = getAtom(verb, arity)
result = (atom in self.respondingAtoms() or
atom in mirandaAtoms)
return wrapBool(result)
if atom is _SEALEDDISPATCH_1:
# to _sealedDispatch(_): return null
from typhon.objects.constants import NullObject
return NullObject
if atom is _UNCALL_0:
from typhon.objects.constants import NullObject
return NullObject
if atom is _WHENMORERESOLVED_1:
# Welcome to _whenMoreResolved.
# This method's implementation, in Monte, should be:
# to _whenMoreResolved(callback): callback<-(self)
from typhon.vats import currentVat
vat = currentVat.get()
vat.sendOnly(arguments[0], RUN_1, [self], EMPTY_MAP)
from typhon.objects.constants import NullObject
return NullObject
addTrail(r, self, atom, arguments)
raise
except UserException as ue:
addTrail(ue, self, atom, arguments)
raise
except MemoryError:
ue = userError(u"Memory corruption or exhausted heap")
addTrail(ue, self, atom, arguments)
raise ue
except StackOverflow:
check_stack_overflow()
ue = userError(u"Stack overflow")
addTrail(ue, self, atom, arguments)
raise ue
class LLFrame(object):
def __init__(self, graph, args, llinterpreter):
assert not graph or isinstance(graph, FunctionGraph)
self.graph = graph
self.args = args
self.llinterpreter = llinterpreter
self.heap = llinterpreter.heap
self.bindings = {}
self.curr_block = None
self.curr_operation_index = 0
self.alloca_objects = []
def newsubframe(self, graph, args):
return self.__class__(graph, args, self.llinterpreter)
# _______________________________________________________
# variable setters/getters helpers
def clear(self):
self.bindings.clear()
def fillvars(self, block, values):
vars = block.inputargs
assert len(vars) == len(values), (
"block %s received %d args, expected %d" %
(block, len(values), len(vars)))
for var, val in zip(vars, values):
self.setvar(var, val)
def setvar(self, var, val):
if var.concretetype is not lltype.Void:
try:
val = lltype.enforce(var.concretetype, val)
except TypeError:
assert False, "type error: input value of type:\n\n\t%r\n\n===> variable of type:\n\n\t%r\n" % (
lltype.typeOf(val), var.concretetype)
assert isinstance(var, Variable)
self.bindings[var] = val
def setifvar(self, var, val):
if isinstance(var, Variable):
self.setvar(var, val)
def getval(self, varorconst):
try:
val = varorconst.value
except AttributeError:
val = self.bindings[varorconst]
if isinstance(val, ComputedIntSymbolic):
val = val.compute_fn()
if varorconst.concretetype is not lltype.Void:
try:
val = lltype.enforce(varorconst.concretetype, val)
except TypeError:
assert False, "type error: %r val from %r var/const" % (
lltype.typeOf(val), varorconst.concretetype)
return val
# _______________________________________________________
# other helpers
def getoperationhandler(self, opname):
ophandler = getattr(self, 'op_' + opname, None)
if ophandler is None:
# try to import the operation from opimpl.py
ophandler = lloperation.LL_OPERATIONS[opname].fold
setattr(self.__class__, 'op_' + opname, staticmethod(ophandler))
return ophandler
# _______________________________________________________
# evaling functions
def eval(self):
graph = self.graph
tracer = self.llinterpreter.tracer
if tracer:
tracer.enter(graph)
self.llinterpreter.frame_stack.append(self)
try:
try:
nextblock = graph.startblock
args = self.args
while 1:
self.clear()
self.fillvars(nextblock, args)
nextblock, args = self.eval_block(nextblock)
if nextblock is None:
for obj in self.alloca_objects:
obj._obj._free()
return args
except Exception:
self.llinterpreter.traceback_frames.append(self)
raise
finally:
leavingframe = self.llinterpreter.frame_stack.pop()
assert leavingframe is self
if tracer:
tracer.leave()
def eval_block(self, block):
""" return (nextblock, values) tuple. If nextblock
is None, values is the concrete return value.
"""
self.curr_block = block
e = None
try:
for i, op in enumerate(block.operations):
self.curr_operation_index = i
self.eval_operation(op)
except LLException, e:
if op is not block.raising_op:
raise
except RuntimeError, e:
rstackovf.check_stack_overflow()
# xxx fish fish fish for proper etype and evalue to use
rtyper = self.llinterpreter.typer
bk = rtyper.annotator.bookkeeper
classdef = bk.getuniqueclassdef(rstackovf._StackOverflow)
exdata = rtyper.exceptiondata
evalue = exdata.get_standard_ll_exc_instance(rtyper, classdef)
etype = exdata.fn_type_of_exc_inst(evalue)
e = LLException(etype, evalue)
if op is not block.raising_op:
raise e
def callAtom(self, atom, arguments, namedArgsMap):
"""
This method is used to reuse atoms without having to rebuild them.
"""
from typhon.objects.collections.maps import EMPTY_MAP
# Promote the atom, on the basis that atoms are generally reused.
atom = promote(atom)
# Log the atom to the JIT log. Don't do this if the atom's not
# promoted; it'll be slow.
jit_debug(atom.repr)
try:
return self.recvNamed(atom, arguments, namedArgsMap)
except Refused as r:
# This block of method implementations is Typhon's Miranda
# protocol. ~ C.
if atom is _CONFORMTO_1:
# Welcome to _conformTo/1.
# to _conformTo(_): return self
return self
if atom is _GETALLEGEDINTERFACE_0:
# Welcome to _getAllegedInterface/0.
interface = self.optInterface()
if interface is None:
from typhon.objects.interfaces import ComputedInterface
interface = ComputedInterface(self)
return interface
if atom is _PRINTON_1:
# Welcome to _printOn/1.
from typhon.objects.constants import NullObject
self.printOn(arguments[0])
return NullObject
if atom is _RESPONDSTO_2:
from typhon.objects.constants import wrapBool
from typhon.objects.data import unwrapInt, unwrapStr
verb = unwrapStr(arguments[0])
arity = unwrapInt(arguments[1])
atom = getAtom(verb, arity)
result = (atom in self.respondingAtoms()
or atom in mirandaAtoms)
return wrapBool(result)
if atom is _SEALEDDISPATCH_1:
# to _sealedDispatch(_): return null
from typhon.objects.constants import NullObject
return NullObject
if atom is _UNCALL_0:
from typhon.objects.constants import NullObject
return NullObject
if atom is _WHENMORERESOLVED_1:
# Welcome to _whenMoreResolved.
# This method's implementation, in Monte, should be:
# to _whenMoreResolved(callback): callback<-(self)
from typhon.vats import currentVat
vat = currentVat.get()
vat.sendOnly(arguments[0], RUN_1, [self], EMPTY_MAP)
from typhon.objects.constants import NullObject
return NullObject
addTrail(r, self, atom, arguments)
raise
except UserException as ue:
addTrail(ue, self, atom, arguments)
raise
except MemoryError:
ue = userError(u"Memory corruption or exhausted heap")
addTrail(ue, self, atom, arguments)
raise ue
except StackOverflow:
check_stack_overflow()
ue = userError(u"Stack overflow")
addTrail(ue, self, atom, arguments)
raise ue
def eval_block(self, block):
""" return (nextblock, values) tuple. If nextblock
is None, values is the concrete return value.
"""
self.curr_block = block
e = None
try:
for i, op in enumerate(block.operations):
self.curr_operation_index = i
self.eval_operation(op)
except LLException as e:
if op is not block.raising_op:
raise
except RuntimeError as e:
rstackovf.check_stack_overflow()
# xxx fish fish fish for proper etype and evalue to use
rtyper = self.llinterpreter.typer
bk = rtyper.annotator.bookkeeper
classdef = bk.getuniqueclassdef(rstackovf._StackOverflow)
exdata = rtyper.exceptiondata
evalue = exdata.get_standard_ll_exc_instance(rtyper, classdef)
etype = exdata.fn_type_of_exc_inst(evalue)
e = LLException(etype, evalue)
if op is not block.raising_op:
raise e
# determine nextblock and/or return value
if len(block.exits) == 0:
# return block
tracer = self.llinterpreter.tracer
if len(block.inputargs) == 2:
# exception
if tracer:
tracer.dump('raise')
etypevar, evaluevar = block.getvariables()
etype = self.getval(etypevar)
evalue = self.getval(evaluevar)
# watch out, these are _ptr's
raise LLException(etype, evalue)
resultvar, = block.getvariables()
result = self.getval(resultvar)
exc_data = self.llinterpreter.get_transformed_exc_data(self.graph)
if exc_data:
# re-raise the exception set by this graph, if any
etype = exc_data.exc_type
if etype:
evalue = exc_data.exc_value
if tracer:
tracer.dump('raise')
exc_data.exc_type = lltype.typeOf(etype)._defl()
exc_data.exc_value = lltype.typeOf(evalue)._defl()
from rpython.translator import exceptiontransform
T = resultvar.concretetype
errvalue = exceptiontransform.error_value(T)
# check that the exc-transformed graph returns the error
# value when it returns with an exception set
assert result == errvalue
raise LLException(etype, evalue)
if tracer:
tracer.dump('return')
return None, result
elif block.exitswitch is None:
# single-exit block
assert len(block.exits) == 1
link = block.exits[0]
elif block.canraise:
link = block.exits[0]
if e:
exdata = self.llinterpreter.typer.exceptiondata
cls = e.args[0]
inst = e.args[1]
for link in block.exits[1:]:
assert issubclass(link.exitcase, py.builtin.BaseException)
if self.op_direct_call(exdata.fn_exception_match,
cls, link.llexitcase):
self.setifvar(link.last_exception, cls)
self.setifvar(link.last_exc_value, inst)
break
else:
# no handler found, pass on
raise e
else:
llexitvalue = self.getval(block.exitswitch)
if block.exits[-1].exitcase == "default":
defaultexit = block.exits[-1]
nondefaultexits = block.exits[:-1]
assert defaultexit.llexitcase is None
else:
defaultexit = None
nondefaultexits = block.exits
for link in nondefaultexits:
if link.llexitcase == llexitvalue:
break # found -- the result is in 'link'
else:
if defaultexit is None:
raise ValueError("exit case %r not found in the exit links "
"of %r" % (llexitvalue, block))
else:
link = defaultexit
return link.target, [self.getval(x) for x in link.args]
