void boolbvt::convert_with_union(
const union_typet &type,
const exprt &op1,
const exprt &op2,
const bvt &prev_bv,
bvt &next_bv)
{
next_bv=prev_bv;
const bvt &op2_bv=convert_bv(op2);
if(next_bv.size()<op2_bv.size())
{
error().source_location=type.source_location();
error() << "convert_with_union: unexpected operand op2 width" << eom;
throw 0;
}
if(config.ansi_c.endianness==configt::ansi_ct::endiannesst::IS_LITTLE_ENDIAN)
{
for(std::size_t i=0; i<op2_bv.size(); i++)
next_bv[i]=op2_bv[i];
}
else
{
assert(config.ansi_c.endianness==configt::ansi_ct::endiannesst::IS_BIG_ENDIAN);
endianness_mapt map_u(type, false, ns);
endianness_mapt map_op2(op2.type(), false, ns);
for(std::size_t i=0; i<op2_bv.size(); i++)
next_bv[map_u.map_bit(i)]=op2_bv[map_op2.map_bit(i)];
}
}
bvt boolbvt::convert_union(const union_exprt &expr)
{
std::size_t width=boolbv_width(expr.type());
if(width==0)
return conversion_failed(expr);
const bvt &op_bv=convert_bv(expr.op());
if(width<op_bv.size())
throw "union: unexpected operand op width";
bvt bv;
bv.resize(width);
if(config.ansi_c.endianness==configt::ansi_ct::endiannesst::IS_LITTLE_ENDIAN)
{
for(std::size_t i=0; i<op_bv.size(); i++)
bv[i]=op_bv[i];
// pad with nondets
for(std::size_t i=op_bv.size(); i<bv.size(); i++)
bv[i]=prop.new_variable();
}
else
{
assert(
config.ansi_c.endianness==configt::ansi_ct::endiannesst::IS_BIG_ENDIAN);
endianness_mapt map_u(expr.type(), false, ns);
endianness_mapt map_op(expr.op0().type(), false, ns);
for(std::size_t i=0; i<op_bv.size(); i++)
bv[map_u.map_bit(i)]=op_bv[map_op.map_bit(i)];
// pad with nondets
for(std::size_t i=op_bv.size(); i<bv.size(); i++)
bv[map_u.map_bit(i)]=prop.new_variable();
}
return bv;
}
