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from rpython.translator.backendopt.finalizer import FinalizerAnalyzer
from rpython.rtyper.lltypesystem import lltype, llmemory, llheap
from rpython.rtyper import llinterp
from rpython.rtyper.annlowlevel import llhelper
from rpython.memory import gctypelayout
from rpython.flowspace.model import Constant
class GCManagedHeap(object):
def __init__(self, llinterp, flowgraphs, gc_class, GC_PARAMS={}):
translator = llinterp.typer.annotator.translator
config = translator.config.translation
self.gc = gc_class(config,
chunk_size = 10,
translated_to_c = False,
**GC_PARAMS)
self.gc.set_root_walker(LLInterpRootWalker(self))
self.gc.DEBUG = True
self.llinterp = llinterp
self.prepare_graphs(flowgraphs)
self.gc.setup()
self.has_write_barrier_from_array = hasattr(self.gc,
'write_barrier_from_array')
def prepare_graphs(self, flowgraphs):
lltype2vtable = self.llinterp.typer.lltype2vtable
layoutbuilder = DirectRunLayoutBuilder(self.gc.__class__,
lltype2vtable,
self.llinterp)
self.get_type_id = layoutbuilder.get_type_id
layoutbuilder.initialize_gc_query_function(self.gc)
constants = collect_constants(flowgraphs)
for obj in constants:
TYPE = lltype.typeOf(obj)
layoutbuilder.consider_constant(TYPE, obj, self.gc)
self.constantroots = layoutbuilder.addresses_of_static_ptrs
self.constantrootsnongc = layoutbuilder.addresses_of_static_ptrs_in_nongc
self._all_prebuilt_gc = layoutbuilder.all_prebuilt_gc
# ____________________________________________________________
#
# Interface for the llinterp
#
def malloc(self, TYPE, n=None, flavor='gc', zero=False,
track_allocation=True):
if flavor == 'gc':
typeid = self.get_type_id(TYPE)
addr = self.gc.malloc(typeid, n, zero=zero)
result = llmemory.cast_adr_to_ptr(addr, lltype.Ptr(TYPE))
if not self.gc.malloc_zero_filled:
gctypelayout.zero_gc_pointers(result)
return result
else:
return lltype.malloc(TYPE, n, flavor=flavor, zero=zero,
track_allocation=track_allocation)
def malloc_nonmovable(self, TYPE, n=None, zero=False):
typeid = self.get_type_id(TYPE)
if not self.gc.can_malloc_nonmovable():
return lltype.nullptr(TYPE)
addr = self.gc.malloc_nonmovable(typeid, n, zero=zero)
result = llmemory.cast_adr_to_ptr(addr, lltype.Ptr(TYPE))
if not self.gc.malloc_zero_filled:
gctypelayout.zero_gc_pointers(result)
return result
def add_memory_pressure(self, size):
if hasattr(self.gc, 'raw_malloc_memory_pressure'):
self.gc.raw_malloc_memory_pressure(size)
def shrink_array(self, p, smallersize):
if hasattr(self.gc, 'shrink_array'):
addr = llmemory.cast_ptr_to_adr(p)
return self.gc.shrink_array(addr, smallersize)
return False
def free(self, TYPE, flavor='gc', track_allocation=True):
assert flavor != 'gc'
return lltype.free(TYPE, flavor=flavor,
track_allocation=track_allocation)
def setfield(self, obj, fieldname, fieldvalue):
STRUCT = lltype.typeOf(obj).TO
addr = llmemory.cast_ptr_to_adr(obj)
addr += llmemory.offsetof(STRUCT, fieldname)
self.setinterior(obj, addr, getattr(STRUCT, fieldname), fieldvalue)
def setarrayitem(self, array, index, newitem):
ARRAY = lltype.typeOf(array).TO
addr = llmemory.cast_ptr_to_adr(array)
addr += llmemory.itemoffsetof(ARRAY, index)
self.setinterior(array, addr, ARRAY.OF, newitem, (index,))
def setinterior(self, toplevelcontainer, inneraddr, INNERTYPE, newvalue,
offsets=()):
if (lltype.typeOf(toplevelcontainer).TO._gckind == 'gc' and
isinstance(INNERTYPE, lltype.Ptr) and INNERTYPE.TO._gckind == 'gc'):
#
wb = True
if self.has_write_barrier_from_array:
for index in offsets:
if type(index) is not str:
assert (type(index) is int # <- fast path
or lltype.typeOf(index) == lltype.Signed)
self.gc.write_barrier_from_array(
llmemory.cast_ptr_to_adr(toplevelcontainer),
index)
wb = False
break
#
if wb:
self.gc.write_barrier(
llmemory.cast_ptr_to_adr(toplevelcontainer))
llheap.setinterior(toplevelcontainer, inneraddr, INNERTYPE, newvalue)
def collect(self, *gen):
self.gc.collect(*gen)
def can_move(self, addr):
return self.gc.can_move(addr)
def weakref_create_getlazy(self, objgetter):
# we have to be lazy in reading the llinterp variable containing
# the 'obj' pointer, because the gc.malloc() call below could
# move it around
type_id = self.get_type_id(gctypelayout.WEAKREF)
addr = self.gc.malloc(type_id, None, zero=False)
result = llmemory.cast_adr_to_ptr(addr, gctypelayout.WEAKREFPTR)
result.weakptr = llmemory.cast_ptr_to_adr(objgetter())
return llmemory.cast_ptr_to_weakrefptr(result)
def weakref_deref(self, PTRTYPE, obj):
addr = gctypelayout.ll_weakref_deref(obj)
return llmemory.cast_adr_to_ptr(addr, PTRTYPE)
def gc_id(self, ptr):
ptr = lltype.cast_opaque_ptr(llmemory.GCREF, ptr)
return self.gc.id(ptr)
def writebarrier_before_copy(self, source, dest,
source_start, dest_start, length):
if self.gc.needs_write_barrier:
source_addr = llmemory.cast_ptr_to_adr(source)
dest_addr = llmemory.cast_ptr_to_adr(dest)
return self.gc.writebarrier_before_copy(source_addr, dest_addr,
source_start, dest_start,
length)
else:
return True
def gcflag_extra(self, subopnum, *args):
if subopnum == 1: # has_gcflag_extra
assert len(args) == 0
return self.gc.gcflag_extra != 0
assert len(args) == 1
addr = llmemory.cast_ptr_to_adr(args[0])
hdr = self.gc.header(addr)
if subopnum == 3: # toggle_gcflag_extra
if hdr.tid & self.gc.gcflag_extra:
hdr.tid &= ~self.gc.gcflag_extra
else:
hdr.tid |= self.gc.gcflag_extra
return (hdr.tid & self.gc.gcflag_extra) != 0
# ____________________________________________________________
class LLInterpRootWalker:
_alloc_flavor_ = 'raw'
def __init__(self, gcheap):
self.gcheap = gcheap
def walk_roots(self, collect_stack_root,
collect_static_in_prebuilt_nongc,
collect_static_in_prebuilt_gc):
gcheap = self.gcheap
gc = gcheap.gc
if collect_static_in_prebuilt_gc:
for addrofaddr in gcheap.constantroots:
if self.gcheap.gc.points_to_valid_gc_object(addrofaddr):
collect_static_in_prebuilt_gc(gc, addrofaddr)
if collect_static_in_prebuilt_nongc:
for addrofaddr in gcheap.constantrootsnongc:
if self.gcheap.gc.points_to_valid_gc_object(addrofaddr):
collect_static_in_prebuilt_nongc(gc, addrofaddr)
if collect_stack_root:
for addrofaddr in gcheap.llinterp.find_roots():
if self.gcheap.gc.points_to_valid_gc_object(addrofaddr):
collect_stack_root(gc, addrofaddr)
def _walk_prebuilt_gc(self, collect): # debugging only! not RPython
for obj in self.gcheap._all_prebuilt_gc:
collect(llmemory.cast_ptr_to_adr(obj._as_ptr()))
def finished_minor_collection(self):
pass
class DirectRunLayoutBuilder(gctypelayout.TypeLayoutBuilder):
def __init__(self, GCClass, lltype2vtable, llinterp):
self.llinterp = llinterp
super(DirectRunLayoutBuilder, self).__init__(GCClass, lltype2vtable)
def make_finalizer_funcptr_for_type(self, TYPE):
from rpython.memory.gctransform.support import get_rtti
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]
destrgraph = destrptr._obj.graph
else:
return None, False
t = self.llinterp.typer.annotator.translator
light = not FinalizerAnalyzer(t).analyze_light_finalizer(destrgraph)
def ll_finalizer(addr):
try:
v = llmemory.cast_adr_to_ptr(addr, DESTR_ARG)
self.llinterp.eval_graph(destrgraph, [v], recursive=True)
except llinterp.LLException:
raise RuntimeError(
"a finalizer raised an exception, shouldn't happen")
return llhelper(gctypelayout.GCData.FINALIZER, ll_finalizer), light
def make_custom_trace_funcptr_for_type(self, TYPE):
from rpython.memory.gctransform.support import get_rtti
rtti = get_rtti(TYPE)
if rtti is not None and hasattr(rtti._obj, 'custom_trace_funcptr'):
return rtti._obj.custom_trace_funcptr
else:
return None
def collect_constants(graphs):
constants = {}
def collect_args(args):
for arg in args:
if (isinstance(arg, Constant) and
arg.concretetype is not lltype.Void):
reccollect(constants, arg.value)
for graph in graphs:
for block in graph.iterblocks():
collect_args(block.inputargs)
for op in block.operations:
collect_args(op.args)
for link in graph.iterlinks():
collect_args(link.args)
if hasattr(link, "llexitcase"):
reccollect(constants, link.llexitcase)
return constants
def reccollect(constants, llvalue):
if (isinstance(llvalue, lltype._abstract_ptr)
and llvalue._obj is not None and llvalue._obj not in constants
and not isinstance(llvalue._obj, int)):
TYPE = llvalue._T
constants[llvalue._obj] = True
if isinstance(TYPE, lltype.Struct):
for name in TYPE._names:
reccollect(constants, getattr(llvalue, name))
elif isinstance(TYPE, lltype.Array):
for llitem in llvalue:
reccollect(constants, llitem)
parent, parentindex = lltype.parentlink(llvalue._obj)
if parent is not None:
reccollect(constants, parent._as_ptr())
def prepare_graphs_and_create_gc(llinterp, GCClass, GC_PARAMS={}):
flowgraphs = llinterp.typer.annotator.translator.graphs[:]
llinterp.heap = GCManagedHeap(llinterp, flowgraphs, GCClass, GC_PARAMS)
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