def transform_block(self, block, is_borrowed):
llops = LowLevelOpList()
#self.curr_block = block
self.livevars = [
var for var in block.inputargs
if var_needsgc(var) and not is_borrowed(var)
]
allvars = [var for var in block.getvariables() if var_needsgc(var)]
self.var_last_needed_in = dict.fromkeys(allvars, 0)
for i, op in enumerate(block.operations):
for var in op.args:
if not var_needsgc(var):
continue
self.var_last_needed_in[var] = i
for link in block.exits:
for var in link.args:
if not var_needsgc(var):
continue
self.var_last_needed_in[var] = len(block.operations) + 1
for i, op in enumerate(block.operations):
hop = GcHighLevelOp(self, op, i, llops)
hop.dispatch()
if len(block.exits) != 0: # i.e not the return block
assert block.exitswitch is not c_last_exception
deadinallexits = set(self.livevars)
for link in block.exits:
deadinallexits.difference_update(set(link.args))
for var in deadinallexits:
self.pop_alive(var, llops)
for link in block.exits:
livecounts = dict.fromkeys(
set(self.livevars) - deadinallexits, 1)
for v, v2 in zip(link.args, link.target.inputargs):
if is_borrowed(v2):
continue
if v in livecounts:
livecounts[v] -= 1
elif var_needsgc(v):
# 'v' is typically a Constant here, but it can be
# a borrowed variable going into a non-borrowed one
livecounts[v] = -1
self.links_to_split[link] = livecounts
block.operations[:] = llops
self.livevars = None
self.var_last_needed_in = None
def transform_block(self, block, is_borrowed):
llops = LowLevelOpList()
#self.curr_block = block
self.livevars = [var for var in block.inputargs
if var_needsgc(var) and not is_borrowed(var)]
allvars = [var for var in block.getvariables() if var_needsgc(var)]
self.var_last_needed_in = dict.fromkeys(allvars, 0)
for i, op in enumerate(block.operations):
for var in op.args:
if not var_needsgc(var):
continue
self.var_last_needed_in[var] = i
for link in block.exits:
for var in link.args:
if not var_needsgc(var):
continue
self.var_last_needed_in[var] = len(block.operations) + 1
for i, op in enumerate(block.operations):
hop = GcHighLevelOp(self, op, i, llops)
hop.dispatch()
if len(block.exits) != 0: # i.e not the return block
assert block.exitswitch is not c_last_exception
deadinallexits = sets.Set(self.livevars)
for link in block.exits:
deadinallexits.difference_update(sets.Set(link.args))
for var in deadinallexits:
self.pop_alive(var, llops)
for link in block.exits:
livecounts = dict.fromkeys(sets.Set(self.livevars) - deadinallexits, 1)
for v, v2 in zip(link.args, link.target.inputargs):
if is_borrowed(v2):
continue
if v in livecounts:
livecounts[v] -= 1
elif var_needsgc(v):
# 'v' is typically a Constant here, but it can be
# a borrowed variable going into a non-borrowed one
livecounts[v] = -1
self.links_to_split[link] = livecounts
block.operations[:] = llops
self.livevars = None
self.var_last_needed_in = None
def checkblock(block, is_borrowed, is_start_block):
if block.operations == ():
# a return/exception block -- don't want to think about them
# (even though the test passes for somewhat accidental reasons)
return
if is_start_block:
refs_in = 0
else:
refs_in = len([
v for v in block.inputargs if isinstance(v, Variable)
and var_needsgc(v) and not is_borrowed(v)
])
push_alives = len(
[op for op in block.operations if op.opname == 'gc_push_alive'])
pyobj_push_alives = len(
[op for op in block.operations if op.opname == 'gc_push_alive_pyobj'])
# implicit_pyobj_pushalives included calls to things that return pyobject*
implicit_pyobj_pushalives = len([
op for op in block.operations
if var_ispyobj(op.result) and op.opname not in ('getfield',
'getarrayitem',
'same_as')
])
nonpyobj_gc_returning_calls = len([
op for op in block.operations
if op.opname in ('direct_call', 'indirect_call')
and var_needsgc(op.result) and not var_ispyobj(op.result)
])
pop_alives = len(
[op for op in block.operations if op.opname == 'gc_pop_alive'])
pyobj_pop_alives = len(
[op for op in block.operations if op.opname == 'gc_pop_alive_pyobj'])
if pop_alives == len(block.operations):
# it's a block we inserted
return
for link in block.exits:
assert block.exitswitch is not c_last_exception
refs_out = 0
for v2 in link.target.inputargs:
if var_needsgc(v2) and not is_borrowed(v2):
refs_out += 1
pyobj_pushes = pyobj_push_alives + implicit_pyobj_pushalives
nonpyobj_pushes = push_alives + nonpyobj_gc_returning_calls
assert refs_in + pyobj_pushes + nonpyobj_pushes == pop_alives + pyobj_pop_alives + refs_out
def checkblock(block, is_borrowed, is_start_block):
if block.operations == ():
# a return/exception block -- don't want to think about them
# (even though the test passes for somewhat accidental reasons)
return
if is_start_block:
refs_in = 0
else:
refs_in = len([v for v in block.inputargs if isinstance(v, Variable)
and var_needsgc(v)
and not is_borrowed(v)])
push_alives = len([op for op in block.operations
if op.opname == 'gc_push_alive'])
pyobj_push_alives = len([op for op in block.operations
if op.opname == 'gc_push_alive_pyobj'])
# implicit_pyobj_pushalives included calls to things that return pyobject*
implicit_pyobj_pushalives = len([op for op in block.operations
if var_ispyobj(op.result)
and op.opname not in ('getfield', 'getarrayitem', 'same_as')])
nonpyobj_gc_returning_calls = len([op for op in block.operations
if op.opname in ('direct_call', 'indirect_call')
and var_needsgc(op.result)
and not var_ispyobj(op.result)])
pop_alives = len([op for op in block.operations
if op.opname == 'gc_pop_alive'])
pyobj_pop_alives = len([op for op in block.operations
if op.opname == 'gc_pop_alive_pyobj'])
if pop_alives == len(block.operations):
# it's a block we inserted
return
for link in block.exits:
assert block.exitswitch is not c_last_exception
refs_out = 0
for v2 in link.target.inputargs:
if var_needsgc(v2) and not is_borrowed(v2):
refs_out += 1
pyobj_pushes = pyobj_push_alives + implicit_pyobj_pushalives
nonpyobj_pushes = push_alives + nonpyobj_gc_returning_calls
assert refs_in + pyobj_pushes + nonpyobj_pushes == pop_alives + pyobj_pop_alives + refs_out
def dispatch(self):
gct = self.gctransformer
opname = self.spaceop.opname
v_result = self.spaceop.result
meth = getattr(gct, 'gct_' + opname, gct.default)
meth(self)
if var_needsgc(v_result):
gct.livevars.append(v_result)
if var_ispyobj(v_result):
if opname in ('getfield', 'getarrayitem', 'same_as',
'cast_pointer', 'getsubstruct',
'getinteriorfield'):
# XXX more operations?
gct.push_alive(v_result, self.llops)
elif opname not in ('direct_call', 'indirect_call'):
gct.push_alive(v_result, self.llops)
def var_needs_set_transform(self, var):
return var_needsgc(var)
def var_needs_set_transform(self, var):
return var_needsgc(var)