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from rpython.memory.gctransform.transform import GCTransformer, mallocHelpers
from rpython.memory.gctransform.support import find_gc_ptrs_in_type, \
get_rtti, _static_deallocator_body_for_type, LLTransformerOp, ll_call_destructor
from rpython.rtyper.lltypesystem import lltype, llmemory
from rpython.rtyper.lltypesystem.lloperation import llop
from rpython.translator.backendopt.support import var_needsgc
from rpython.rtyper import rmodel
from rpython.memory.gcheader import GCHeaderBuilder
from rpython.rlib.rarithmetic import ovfcheck
from rpython.rtyper.rbuiltin import gen_cast
import sys
counts = {}
ADDRESS_VOID_FUNC = lltype.FuncType([llmemory.Address], lltype.Void)
class RefcountingGCTransformer(GCTransformer):
malloc_zero_filled = True
HDR = lltype.Struct("header", ("refcount", lltype.Signed),
("hash", lltype.Signed))
def __init__(self, translator):
super(RefcountingGCTransformer, self).__init__(translator, inline=True)
self.gcheaderbuilder = GCHeaderBuilder(self.HDR)
gc_header_offset = self.gcheaderbuilder.size_gc_header
self.deallocator_graphs_needing_transforming = []
# create incref, etc graph
memoryError = MemoryError()
HDRPTR = lltype.Ptr(self.HDR)
def ll_incref(adr):
if adr:
gcheader = llmemory.cast_adr_to_ptr(adr - gc_header_offset, HDRPTR)
gcheader.refcount = gcheader.refcount + 1
def ll_decref(adr, dealloc):
if adr:
gcheader = llmemory.cast_adr_to_ptr(adr - gc_header_offset, HDRPTR)
refcount = gcheader.refcount - 1
gcheader.refcount = refcount
if refcount == 0:
dealloc(adr)
def ll_decref_simple(adr):
if adr:
gcheader = llmemory.cast_adr_to_ptr(adr - gc_header_offset, HDRPTR)
refcount = gcheader.refcount - 1
if refcount == 0:
llop.gc_free(lltype.Void, adr)
else:
gcheader.refcount = refcount
def ll_no_pointer_dealloc(adr):
llop.gc_free(lltype.Void, adr)
mh = mallocHelpers()
mh.allocate = llmemory.raw_malloc
def ll_malloc_fixedsize(size):
size = gc_header_offset + size
result = mh._ll_malloc_fixedsize(size)
llmemory.raw_memclear(result, size)
result += gc_header_offset
return result
def ll_malloc_varsize_no_length(length, size, itemsize):
try:
fixsize = gc_header_offset + size
varsize = ovfcheck(itemsize * length)
tot_size = ovfcheck(fixsize + varsize)
except OverflowError:
raise MemoryError()
result = mh._ll_malloc_fixedsize(tot_size)
llmemory.raw_memclear(result, tot_size)
result += gc_header_offset
return result
mh.ll_malloc_varsize_no_length = ll_malloc_varsize_no_length
ll_malloc_varsize = mh.ll_malloc_varsize
def ll_identityhash(addr):
obj = llmemory.cast_adr_to_ptr(addr, HDRPTR)
h = obj.hash
if h == 0:
obj.hash = h = llmemory.cast_adr_to_int(addr)
return h
if self.translator:
self.increfptr = self.inittime_helper(
ll_incref, [llmemory.Address], lltype.Void)
self.decref_ptr = self.inittime_helper(
ll_decref, [llmemory.Address, lltype.Ptr(ADDRESS_VOID_FUNC)],
lltype.Void)
self.decref_simple_ptr = self.inittime_helper(
ll_decref_simple, [llmemory.Address], lltype.Void)
self.no_pointer_dealloc_ptr = self.inittime_helper(
ll_no_pointer_dealloc, [llmemory.Address], lltype.Void)
self.malloc_fixedsize_ptr = self.inittime_helper(
ll_malloc_fixedsize, [lltype.Signed], llmemory.Address)
self.malloc_varsize_no_length_ptr = self.inittime_helper(
ll_malloc_varsize_no_length, [lltype.Signed]*3, llmemory.Address)
self.malloc_varsize_ptr = self.inittime_helper(
ll_malloc_varsize, [lltype.Signed]*4, llmemory.Address)
self.identityhash_ptr = self.inittime_helper(
ll_identityhash, [llmemory.Address], lltype.Signed,
inline=False)
self.mixlevelannotator.finish()
self.mixlevelannotator.backend_optimize()
# cache graphs:
self.decref_funcptrs = {}
self.static_deallocator_funcptrs = {}
self.dynamic_deallocator_funcptrs = {}
self.queryptr2dynamic_deallocator_funcptr = {}
def finish_helpers(self, **kwds):
GCTransformer.finish_helpers(self, **kwds)
from rpython.translator.backendopt.malloc import remove_mallocs
seen = {}
graphs = []
for fptr in self.static_deallocator_funcptrs.itervalues():
graph = fptr._obj.graph
if graph in seen:
continue
seen[graph] = True
graphs.append(graph)
remove_mallocs(self.translator, graphs)
def var_needs_set_transform(self, var):
return var_needsgc(var)
def push_alive(self, var, llops):
v_adr = gen_cast(llops, llmemory.Address, var)
llops.genop("direct_call", [self.increfptr, v_adr])
def pop_alive(self, var, llops):
PTRTYPE = var.concretetype
v_adr = gen_cast(llops, llmemory.Address, var)
dealloc_fptr = self.dynamic_deallocation_funcptr_for_type(PTRTYPE.TO)
if dealloc_fptr is self.no_pointer_dealloc_ptr.value:
# simple case
llops.genop("direct_call", [self.decref_simple_ptr, v_adr])
else:
cdealloc_fptr = rmodel.inputconst(
lltype.typeOf(dealloc_fptr), dealloc_fptr)
llops.genop("direct_call", [self.decref_ptr, v_adr, cdealloc_fptr])
def gct_fv_gc_malloc(self, hop, flags, TYPE, c_size):
v_raw = hop.genop("direct_call", [self.malloc_fixedsize_ptr, c_size],
resulttype=llmemory.Address)
return v_raw
def gct_fv_gc_malloc_varsize(self, hop, flags, TYPE, v_length, c_const_size, c_item_size,
c_offset_to_length):
if c_offset_to_length is None:
v_raw = hop.genop("direct_call",
[self.malloc_varsize_no_length_ptr, v_length,
c_const_size, c_item_size],
resulttype=llmemory.Address)
else:
v_raw = hop.genop("direct_call",
[self.malloc_varsize_ptr, v_length,
c_const_size, c_item_size, c_offset_to_length],
resulttype=llmemory.Address)
return v_raw
def gct_gc_deallocate(self, hop):
TYPE = hop.spaceop.args[0].value
v_addr = hop.spaceop.args[1]
dealloc_fptr = self.dynamic_deallocation_funcptr_for_type(TYPE)
cdealloc_fptr = rmodel.inputconst(
lltype.typeOf(dealloc_fptr), dealloc_fptr)
hop.genop("direct_call", [cdealloc_fptr, v_addr])
def consider_constant(self, TYPE, value):
if value is not lltype.top_container(value):
return
if isinstance(TYPE, (lltype.GcStruct, lltype.GcArray)):
p = value._as_ptr()
if not self.gcheaderbuilder.get_header(p):
hdr = self.gcheaderbuilder.new_header(p)
hdr.refcount = sys.maxint // 2
hdr.hash = lltype.identityhash_nocache(p)
def static_deallocation_funcptr_for_type(self, TYPE):
if TYPE in self.static_deallocator_funcptrs:
return self.static_deallocator_funcptrs[TYPE]
#print_call_chain(self)
rtti = get_rtti(TYPE)
if rtti is not None and hasattr(rtti._obj, 'destructor_funcptr'):
destrptr = rtti._obj.destructor_funcptr
DESTR_ARG = lltype.typeOf(destrptr).TO.ARGS[0]
else:
destrptr = None
DESTR_ARG = None
if destrptr is None and not find_gc_ptrs_in_type(TYPE):
p = self.no_pointer_dealloc_ptr.value
self.static_deallocator_funcptrs[TYPE] = p
return p
if destrptr is not None:
body = '\n'.join(_static_deallocator_body_for_type('v', TYPE, 3))
src = """
def ll_deallocator(addr):
exc_instance = llop.gc_fetch_exception(EXC_INSTANCE_TYPE)
try:
v = cast_adr_to_ptr(addr, PTR_TYPE)
gcheader = cast_adr_to_ptr(addr - gc_header_offset, HDRPTR)
# refcount is at zero, temporarily bump it to 1:
gcheader.refcount = 1
destr_v = cast_pointer(DESTR_ARG, v)
ll_call_destructor(destrptr, destr_v, %r)
refcount = gcheader.refcount - 1
gcheader.refcount = refcount
if refcount == 0:
%s
llop.%s_free(lltype.Void, addr)
except:
pass
llop.gc_restore_exception(lltype.Void, exc_instance)
pop_alive(exc_instance)
# XXX layering of exceptiontransform versus gcpolicy
""" % (TYPE.__name__, body, TYPE._gckind)
else:
call_del = None
body = '\n'.join(_static_deallocator_body_for_type('v', TYPE))
src = ('def ll_deallocator(addr):\n v = cast_adr_to_ptr(addr, PTR_TYPE)\n' +
body + '\n llop.%s_free(lltype.Void, addr)\n' % (TYPE._gckind,))
d = {'pop_alive': LLTransformerOp(self.pop_alive),
'llop': llop,
'lltype': lltype,
'destrptr': destrptr,
'gc_header_offset': self.gcheaderbuilder.size_gc_header,
'cast_adr_to_ptr': llmemory.cast_adr_to_ptr,
'cast_pointer': lltype.cast_pointer,
'PTR_TYPE': lltype.Ptr(TYPE),
'DESTR_ARG': DESTR_ARG,
'EXC_INSTANCE_TYPE': self.translator.rtyper.exceptiondata.lltype_of_exception_value,
'll_call_destructor': ll_call_destructor,
'HDRPTR':lltype.Ptr(self.HDR)}
exec src in d
this = d['ll_deallocator']
fptr = self.annotate_finalizer(this, [llmemory.Address], lltype.Void)
self.static_deallocator_funcptrs[TYPE] = fptr
for p in find_gc_ptrs_in_type(TYPE):
self.static_deallocation_funcptr_for_type(p.TO)
return fptr
def dynamic_deallocation_funcptr_for_type(self, TYPE):
if TYPE in self.dynamic_deallocator_funcptrs:
return self.dynamic_deallocator_funcptrs[TYPE]
#print_call_chain(self)
rtti = get_rtti(TYPE)
if rtti is None:
p = self.static_deallocation_funcptr_for_type(TYPE)
self.dynamic_deallocator_funcptrs[TYPE] = p
return p
queryptr = rtti._obj.query_funcptr
if queryptr._obj in self.queryptr2dynamic_deallocator_funcptr:
return self.queryptr2dynamic_deallocator_funcptr[queryptr._obj]
RTTI_PTR = lltype.Ptr(lltype.RuntimeTypeInfo)
QUERY_ARG_TYPE = lltype.typeOf(queryptr).TO.ARGS[0]
gc_header_offset = self.gcheaderbuilder.size_gc_header
HDRPTR = lltype.Ptr(self.HDR)
def ll_dealloc(addr):
# bump refcount to 1
gcheader = llmemory.cast_adr_to_ptr(addr - gc_header_offset, HDRPTR)
gcheader.refcount = 1
v = llmemory.cast_adr_to_ptr(addr, QUERY_ARG_TYPE)
rtti = queryptr(v)
gcheader.refcount = 0
llop.gc_call_rtti_destructor(lltype.Void, rtti, addr)
fptr = self.annotate_helper(ll_dealloc, [llmemory.Address], lltype.Void)
self.dynamic_deallocator_funcptrs[TYPE] = fptr
self.queryptr2dynamic_deallocator_funcptr[queryptr._obj] = fptr
return fptr
def gct_gc_identityhash(self, hop):
v_obj = hop.spaceop.args[0]
v_adr = hop.genop("cast_ptr_to_adr", [v_obj],
resulttype=llmemory.Address)
hop.genop("direct_call", [self.identityhash_ptr, v_adr],
resultvar=hop.spaceop.result)
def gcheader_initdata(self, obj):
top = lltype.top_container(obj)
return self.gcheaderbuilder.header_of_object(top)._obj
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