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"""
Utility RPython functions to inspect objects in the GC.
"""
from rpython.rtyper.lltypesystem import lltype, llmemory, rffi, llgroup
from rpython.rlib.objectmodel import free_non_gc_object
from rpython.rlib import rposix, rgc, jit
from rpython.memory.support import AddressDict, get_address_stack
# ---------- implementation of rpython.rlib.rgc.get_rpy_roots() ----------
def _counting_rpy_root(obj, gc):
gc._count_rpy += 1
def _do_count_rpy_roots(gc):
gc._count_rpy = 0
gc.enumerate_all_roots(_counting_rpy_root, gc)
return gc._count_rpy
def _append_rpy_root(obj, gc):
# Can use the gc list, but should not allocate!
# It is essential that the list is not resizable!
lst = gc._list_rpy
index = gc._count_rpy
if index >= len(lst):
raise ValueError
gc._count_rpy = index + 1
lst[index] = llmemory.cast_adr_to_ptr(obj, llmemory.GCREF)
def _do_append_rpy_roots(gc, lst):
gc._count_rpy = 0
gc._list_rpy = lst
gc.enumerate_all_roots(_append_rpy_root, gc)
gc._list_rpy = None
def get_rpy_roots(gc):
count = _do_count_rpy_roots(gc)
extra = 16
while True:
result = [lltype.nullptr(llmemory.GCREF.TO)] * (count + extra)
try:
_do_append_rpy_roots(gc, result)
except ValueError:
extra *= 3
else:
return result
# ---------- implementation of rpython.rlib.rgc.get_rpy_referents() ----------
def _count_rpy_referent(pointer, gc):
gc._count_rpy += 1
def _do_count_rpy_referents(gc, gcref):
gc._count_rpy = 0
gc.trace(llmemory.cast_ptr_to_adr(gcref), _count_rpy_referent, gc)
return gc._count_rpy
def _append_rpy_referent(pointer, gc):
# Can use the gc list, but should not allocate!
# It is essential that the list is not resizable!
lst = gc._list_rpy
index = gc._count_rpy
if index >= len(lst):
raise ValueError
gc._count_rpy = index + 1
lst[index] = llmemory.cast_adr_to_ptr(pointer.address[0],
llmemory.GCREF)
def _do_append_rpy_referents(gc, gcref, lst):
gc._count_rpy = 0
gc._list_rpy = lst
gc.trace(llmemory.cast_ptr_to_adr(gcref), _append_rpy_referent, gc)
def get_rpy_referents(gc, gcref):
count = _do_count_rpy_referents(gc, gcref)
result = [lltype.nullptr(llmemory.GCREF.TO)] * count
_do_append_rpy_referents(gc, gcref, result)
return result
# ----------
def get_rpy_memory_usage(gc, gcref):
return gc.get_size_incl_hash(llmemory.cast_ptr_to_adr(gcref))
def get_rpy_type_index(gc, gcref):
typeid = gc.get_type_id(llmemory.cast_ptr_to_adr(gcref))
return gc.get_member_index(typeid)
def is_rpy_instance(gc, gcref):
typeid = gc.get_type_id(llmemory.cast_ptr_to_adr(gcref))
return gc.is_rpython_class(typeid)
# ----------
raw_os_write = rffi.llexternal(rposix.UNDERSCORE_ON_WIN32 + 'write',
[rffi.INT, llmemory.Address, rffi.SIZE_T],
rffi.SIZE_T,
sandboxsafe=True, _nowrapper=True)
AddressStack = get_address_stack()
class HeapDumper(object):
_alloc_flavor_ = "raw"
BUFSIZE = 8192 # words
def __init__(self, gc, fd):
self.gc = gc
self.gcflag = gc.gcflag_extra
self.fd = rffi.cast(rffi.INT, fd)
self.writebuffer = lltype.malloc(rffi.SIGNEDP.TO, self.BUFSIZE,
flavor='raw')
self.buf_count = 0
if self.gcflag == 0:
self.seen = AddressDict()
self.pending = AddressStack()
def delete(self):
if self.gcflag == 0:
self.seen.delete()
self.pending.delete()
lltype.free(self.writebuffer, flavor='raw')
free_non_gc_object(self)
@jit.dont_look_inside
def flush(self):
if self.buf_count > 0:
bytes = self.buf_count * rffi.sizeof(rffi.LONG)
count = raw_os_write(self.fd,
rffi.cast(llmemory.Address, self.writebuffer),
rffi.cast(rffi.SIZE_T, bytes))
if rffi.cast(lltype.Signed, count) != bytes:
raise OSError(rffi.cast(lltype.Signed, rposix._get_errno()),
"raw_os_write failed")
self.buf_count = 0
flush._dont_inline_ = True
def write(self, value):
x = self.buf_count
self.writebuffer[x] = value
x += 1
self.buf_count = x
if x == self.BUFSIZE:
self.flush()
write._always_inline_ = True
# ----------
def write_marker(self):
self.write(0)
self.write(0)
self.write(0)
self.write(-1)
def writeobj(self, obj):
gc = self.gc
typeid = gc.get_type_id(obj)
self.write(llmemory.cast_adr_to_int(obj))
self.write(gc.get_member_index(typeid))
self.write(gc.get_size_incl_hash(obj))
gc.trace(obj, self._writeref, None)
self.write(-1)
def _writeref(self, pointer, _):
obj = pointer.address[0]
self.write(llmemory.cast_adr_to_int(obj))
self.add(obj)
def add(self, obj):
if self.gcflag == 0:
if not self.seen.contains(obj):
self.seen.setitem(obj, obj)
self.pending.append(obj)
else:
hdr = self.gc.header(obj)
if (hdr.tid & self.gcflag) == 0:
hdr.tid |= self.gcflag
self.pending.append(obj)
def add_roots(self):
self.gc.enumerate_all_roots(_hd_add_root, self)
pendingroots = self.pending
self.pending = AddressStack()
self.walk(pendingroots)
pendingroots.delete()
self.write_marker()
def walk(self, pending):
while pending.non_empty():
self.writeobj(pending.pop())
# ----------
# A simplified copy of the above, to make sure we walk again all the
# objects to clear the 'gcflag'.
def unwriteobj(self, obj):
gc = self.gc
gc.trace(obj, self._unwriteref, None)
def _unwriteref(self, pointer, _):
obj = pointer.address[0]
self.unadd(obj)
def unadd(self, obj):
assert self.gcflag != 0
hdr = self.gc.header(obj)
if (hdr.tid & self.gcflag) != 0:
hdr.tid &= ~self.gcflag
self.pending.append(obj)
def clear_gcflag_again(self):
self.gc.enumerate_all_roots(_hd_unadd_root, self)
pendingroots = self.pending
self.pending = AddressStack()
self.unwalk(pendingroots)
pendingroots.delete()
def unwalk(self, pending):
while pending.non_empty():
self.unwriteobj(pending.pop())
def _hd_add_root(obj, heap_dumper):
heap_dumper.add(obj)
def _hd_unadd_root(obj, heap_dumper):
heap_dumper.unadd(obj)
def dump_rpy_heap(gc, fd):
heapdumper = HeapDumper(gc, fd)
heapdumper.add_roots()
heapdumper.walk(heapdumper.pending)
heapdumper.flush()
if heapdumper.gcflag != 0:
heapdumper.clear_gcflag_again()
heapdumper.unwalk(heapdumper.pending)
heapdumper.delete()
return True
def get_typeids_z(gc):
srcaddress = gc.root_walker.gcdata.typeids_z
return llmemory.cast_adr_to_ptr(srcaddress, lltype.Ptr(rgc.ARRAY_OF_CHAR))
def get_typeids_list(gc):
srcaddress = gc.root_walker.gcdata.typeids_list
return llmemory.cast_adr_to_ptr(srcaddress, lltype.Ptr(ARRAY_OF_HALFWORDS))
ARRAY_OF_HALFWORDS = lltype.Array(llgroup.HALFWORD)
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