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from rpython.rtyper.lltypesystem import lltype, llmemory, llarena
from rpython.rlib.rarithmetic import is_emulated_long
import struct
memory_alignment = struct.calcsize("P")
primitive_to_fmt = {lltype.Signed: "l",
lltype.Unsigned: "L",
lltype.Char: "c",
lltype.UniChar: "i", # 4 bytes
lltype.Bool: "B",
lltype.Float: "d",
llmemory.Address: "P",
}
if is_emulated_long:
primitive_to_fmt.update( {
lltype.Signed: "q",
lltype.Unsigned: "Q",
} )
#___________________________________________________________________________
# Utility functions that know about the memory layout of the lltypes
# in the simulation
#returns some sort of layout information that is useful for the simulatorptr
def get_layout(TYPE):
layout = {}
if isinstance(TYPE, lltype.Primitive):
try:
return primitive_to_fmt[TYPE]
except KeyError:
from rpython.rtyper.lltypesystem import rffi
return rffi.sizeof(TYPE)
elif isinstance(TYPE, lltype.Ptr):
return "P"
elif isinstance(TYPE, lltype.Struct):
curr = 0
for name in TYPE._names:
layout[name] = curr
curr += get_fixed_size(TYPE._flds[name])
layout["_size"] = curr
return layout
elif isinstance(TYPE, lltype.Array):
return (get_fixed_size(lltype.Signed), get_fixed_size(TYPE.OF))
elif isinstance(TYPE, lltype.OpaqueType):
return "i"
elif isinstance(TYPE, lltype.FuncType):
return "i"
else:
assert 0, "type %s not yet implemented" % (TYPE, )
def get_fixed_size(TYPE):
if isinstance(TYPE, lltype.Primitive):
if TYPE == lltype.Void:
return 0
try:
return struct.calcsize(primitive_to_fmt[TYPE])
except KeyError:
from rpython.rtyper.lltypesystem import rffi
return rffi.sizeof(TYPE)
elif isinstance(TYPE, lltype.Ptr):
return struct.calcsize("P")
elif isinstance(TYPE, lltype.Struct):
return get_layout(TYPE)["_size"]
elif isinstance(TYPE, lltype.Array):
return get_fixed_size(lltype.Unsigned)
elif isinstance(TYPE, lltype.OpaqueType):
return get_fixed_size(lltype.Unsigned)
elif isinstance(TYPE, lltype.FuncType):
return get_fixed_size(lltype.Unsigned)
assert 0, "not yet implemented"
def get_variable_size(TYPE):
if isinstance(TYPE, lltype.Array):
return get_fixed_size(TYPE.OF)
elif isinstance(TYPE, lltype.Primitive):
return 0
elif isinstance(TYPE, lltype.Struct):
if TYPE._arrayfld is not None:
return get_variable_size(TYPE._flds[TYPE._arrayfld])
else:
return 0
elif isinstance(TYPE, lltype.OpaqueType):
return 0
elif isinstance(TYPE, lltype.FuncType):
return 0
elif isinstance(TYPE, lltype.Ptr):
return 0
else:
assert 0, "not yet implemented"
def sizeof(TYPE, i=None):
fixedsize = get_fixed_size(TYPE)
varsize = get_variable_size(TYPE)
if i is None:
assert varsize == 0
return fixedsize
else:
return fixedsize + i * varsize
def convert_offset_to_int(offset):
if isinstance(offset, llmemory.FieldOffset):
layout = get_layout(offset.TYPE)
return layout[offset.fldname]
elif isinstance(offset, llmemory.CompositeOffset):
return sum([convert_offset_to_int(item) for item in offset.offsets])
elif type(offset) == llmemory.AddressOffset:
return 0
elif isinstance(offset, llmemory.ItemOffset):
return sizeof(offset.TYPE) * offset.repeat
elif isinstance(offset, llmemory.ArrayItemsOffset):
if offset.TYPE._hints.get('nolength', None):
return 0
return get_fixed_size(lltype.Signed)
elif isinstance(offset, llmemory.GCHeaderOffset):
return sizeof(offset.gcheaderbuilder.HDR)
elif isinstance(offset, llmemory.ArrayLengthOffset):
return 0
elif isinstance(offset, llarena.RoundedUpForAllocation):
basesize = convert_offset_to_int(offset.basesize)
if isinstance(offset.minsize, llmemory.AddressOffset):
minsize = convert_offset_to_int(offset.minsize)
if minsize > basesize:
basesize = minsize
mask = memory_alignment - 1
return (basesize + mask) & ~ mask
else:
raise Exception("unknown offset type %r"%offset)
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