def _convert(self, obj):
if isinstance(obj, FSort):
return z3.FPSort(obj.exp, obj.mantissa, ctx=self._context)
elif isinstance(obj, RM):
if obj == RM_RNE:
return z3.RNE(ctx=self._context)
elif obj == RM_RNA:
return z3.RNA(ctx=self._context)
elif obj == RM_RTP:
return z3.RTP(ctx=self._context)
elif obj == RM_RTN:
return z3.RTN(ctx=self._context)
elif obj == RM_RTZ:
return z3.RTZ(ctx=self._context)
else:
raise BackendError("unrecognized rounding mode")
elif obj is True:
return z3.BoolVal(True, ctx=self._context)
elif obj is False:
return z3.BoolVal(False, ctx=self._context)
elif isinstance(obj, (numbers.Number, str)):
return obj
elif hasattr(obj, '__module__') and obj.__module__ in ('z3', 'z3.z3'):
return obj
else:
l.debug("BackendZ3 encountered unexpected type %s", type(obj))
raise BackendError("unexpected type %s encountered in BackendZ3" %
type(obj))
def _convert(self, obj, result=None):
if type(obj) is NativeBVV:
return z3.BitVecVal(obj.value, obj.bits)
elif isinstance(obj, FSort):
return z3.FPSort(obj.exp, obj.mantissa)
elif isinstance(obj, RM):
if obj == RM_RNE:
return z3.RNE()
elif obj == RM_RNA:
return z3.RNA()
elif obj == RM_RTP:
return z3.RTP()
elif obj == RM_RTN:
return z3.RTN()
elif obj == RM_RTZ:
return z3.RTZ()
else:
raise BackendError("unrecognized rounding mode")
elif isinstance(obj, NativeFPV):
val = str(obj.value)
sort = self._convert(obj.sort)
if val == 'inf':
return z3.fpPlusInfinity(sort)
elif val == '-inf':
return z3.fpMinusInfinity(sort)
elif val == '0.0':
return z3.fpPlusZero(sort)
elif val == '-0.0':
return z3.fpMinusZero(sort)
elif val == 'nan':
return z3.fpNaN(sort)
else:
better_val = str(Decimal(obj.value))
return z3.FPVal(better_val, sort)
elif obj is True:
return z3.BoolVal(True)
elif obj is False:
return z3.BoolVal(False)
elif type(obj) in (int, long, float, str):
return obj
elif hasattr(obj, '__module__') and obj.__module__ == 'z3':
return obj
else:
l.debug("BackendZ3 encountered unexpected type %s", type(obj))
raise BackendError("unexpected type %s encountered in BackendZ3" %
type(obj))
def _(term, smt):
v = smt.eval(term.arg)
src = smt.type(term.arg)
tgt = smt.type(term)
w = 2**(tgt.exp) - 1
if src.width > w:
m = (2**tgt.frac - 1) << (w - tgt.frac)
conds = [v >= -m, v <= m]
else:
conds = []
b = smt.fresh_bool()
smt.add_qvar(b)
sort = _ty_sort(tgt)
return smt._conditional_conv_value(
conds,
z3.If(b, z3.fpToFP(z3.RTN(), v, sort), z3.fpToFP(z3.RTP(), v, sort)),
term.name)
from .esilclasses import *
import z3
z3.set_param('rewriter.hi_fp_unspecified', 'true')
SIZE = 64
FSIZE = z3.Float64()
FONE = z3.FPVal(1.0, FSIZE)
FZERO = z3.FPVal(0.0, FSIZE)
FNEGONE = z3.FPVal(-1.0, FSIZE)
INT = 1
FLOAT = 2
FPM = z3.RTN()
import logging
logger = logging.getLogger("esilsolve")
def pop_values(stack, state, num: int=1, signext=False) -> List[z3.BitVecRef]:
size = state.esil["size"]
val_type = state.esil["type"]
return [ get_value(stack.pop(), state, signext, size, val_type)
for i in range(num) ]
def get_value(val, state, signext=False, size=SIZE, val_type=INT) \
-> z3.BitVecRef:
if isinstance(val, str):
val = state.registers[val]