literalt boolbvt::convert_ieee_float_rel(const exprt &expr)
{
const exprt::operandst &operands=expr.operands();
const irep_idt &rel=expr.id();
if(operands.size()==2)
{
const exprt &op0=expr.op0();
const exprt &op1=expr.op1();
bvtypet bvtype0=get_bvtype(op0.type());
bvtypet bvtype1=get_bvtype(op1.type());
const bvt &bv0=convert_bv(op0);
const bvt &bv1=convert_bv(op1);
if(bv0.size()==bv1.size() && !bv0.empty() &&
bvtype0==IS_FLOAT && bvtype1==IS_FLOAT)
{
float_utilst float_utils(prop);
float_utils.spec=to_floatbv_type(op0.type());
if(rel==ID_ieee_float_equal)
return float_utils.relation(bv0, float_utilst::EQ, bv1);
else if(rel==ID_ieee_float_notequal)
return !float_utils.relation(bv0, float_utilst::EQ, bv1);
else
return SUB::convert_rest(expr);
}
}
return SUB::convert_rest(expr);
}
boolbv_mapt::map_entryt &boolbv_mapt::get_map_entry(
const irep_idt &identifier,
const typet &type)
{
if(type.id()==ID_symbol)
return get_map_entry(identifier, ns.follow(type));
std::pair<mappingt::iterator, bool> result=
mapping.insert(std::pair<irep_idt, map_entryt>(
identifier, map_entryt()));
map_entryt &map_entry=result.first->second;
if(result.second)
{ // actually inserted
map_entry.type=type;
map_entry.width=boolbv_width(type);
map_entry.bvtype=get_bvtype(type);
map_entry.literal_map.resize(map_entry.width);
}
assert(map_entry.literal_map.size()==map_entry.width);
return map_entry;
}
bvt boolbvt::convert_abs(const exprt &expr)
{
std::size_t width=boolbv_width(expr.type());
if(width==0)
return conversion_failed(expr);
const exprt::operandst &operands=expr.operands();
if(operands.size()!=1)
throw "abs takes one operand";
const exprt &op0=expr.op0();
const bvt &op_bv=convert_bv(op0);
if(op0.type()!=expr.type())
return conversion_failed(expr);
bvtypet bvtype=get_bvtype(expr.type());
if(bvtype==IS_FIXED ||
bvtype==IS_SIGNED ||
bvtype==IS_UNSIGNED)
{
return bv_utils.absolute_value(op_bv);
}
else if(bvtype==IS_FLOAT)
{
float_utilst float_utils(prop);
float_utils.spec=to_floatbv_type(expr.type());
return float_utils.abs(op_bv);
}
return conversion_failed(expr);
}
exprt boolbvt::bv_get_rec(
const bvt &bv,
const std::vector<bool> &unknown,
std::size_t offset,
const typet &type) const
{
if(type.id()==ID_symbol)
return bv_get_rec(bv, unknown, offset, ns.follow(type));
std::size_t width=boolbv_width(type);
assert(bv.size()==unknown.size());
assert(bv.size()>=offset+width);
if(type.id()==ID_bool)
{
if(!unknown[offset])
{
switch(prop.l_get(bv[offset]).get_value())
{
case tvt::tv_enumt::TV_FALSE:
return false_exprt();
case tvt::tv_enumt::TV_TRUE:
return true_exprt();
default:
return false_exprt(); // default
}
}
return nil_exprt();
}
bvtypet bvtype=get_bvtype(type);
if(bvtype==IS_UNKNOWN)
{
if(type.id()==ID_array)
{
const typet &subtype=type.subtype();
std::size_t sub_width=boolbv_width(subtype);
if(sub_width!=0)
{
exprt::operandst op;
op.reserve(width/sub_width);
for(std::size_t new_offset=0;
new_offset<width;
new_offset+=sub_width)
{
op.push_back(
bv_get_rec(bv, unknown, offset+new_offset, subtype));
}
exprt dest=exprt(ID_array, type);
dest.operands().swap(op);
return dest;
}
}
else if(type.id()==ID_struct_tag)
{
return bv_get_rec(bv, unknown, offset, ns.follow_tag(to_struct_tag_type(type)));
}
else if(type.id()==ID_union_tag)
{
return bv_get_rec(bv, unknown, offset, ns.follow_tag(to_union_tag_type(type)));
}
else if(type.id()==ID_struct)
{
const struct_typet &struct_type=to_struct_type(type);
const struct_typet::componentst &components=struct_type.components();
std::size_t new_offset=0;
exprt::operandst op;
op.reserve(components.size());
for(struct_typet::componentst::const_iterator
it=components.begin();
it!=components.end();
it++)
{
const typet &subtype=ns.follow(it->type());
op.push_back(nil_exprt());
std::size_t sub_width=boolbv_width(subtype);
if(sub_width!=0)
{
op.back()=bv_get_rec(bv, unknown, offset+new_offset, subtype);
new_offset+=sub_width;
}
}
struct_exprt dest(type);
dest.operands().swap(op);
return dest;
}
else if(type.id()==ID_union)
{
const union_typet &union_type=to_union_type(type);
const union_typet::componentst &components=union_type.components();
assert(!components.empty());
// Any idea that's better than just returning the first component?
std::size_t component_nr=0;
union_exprt value(union_type);
value.set_component_name(
components[component_nr].get_name());
const typet &subtype=components[component_nr].type();
value.op()=bv_get_rec(bv, unknown, offset, subtype);
return value;
}
else if(type.id()==ID_vector)
{
const typet &subtype=ns.follow(type.subtype());
std::size_t sub_width=boolbv_width(subtype);
if(sub_width!=0 && width%sub_width==0)
{
std::size_t size=width/sub_width;
exprt value(ID_vector, type);
value.operands().resize(size);
for(std::size_t i=0; i<size; i++)
value.operands()[i]=
bv_get_rec(bv, unknown, i*sub_width, subtype);
return value;
}
}
else if(type.id()==ID_complex)
{
const typet &subtype=ns.follow(type.subtype());
std::size_t sub_width=boolbv_width(subtype);
if(sub_width!=0 && width==sub_width*2)
{
exprt value(ID_complex, type);
value.operands().resize(2);
value.op0()=bv_get_rec(bv, unknown, 0*sub_width, subtype);
value.op1()=bv_get_rec(bv, unknown, 1*sub_width, subtype);
return value;
}
}
}
std::string value;
for(std::size_t bit_nr=offset; bit_nr<offset+width; bit_nr++)
{
char ch;
if(unknown[bit_nr])
ch='0';
else
switch(prop.l_get(bv[bit_nr]).get_value())
{
case tvt::tv_enumt::TV_FALSE:
ch='0';
break;
case tvt::tv_enumt::TV_TRUE:
ch='1';
break;
case tvt::tv_enumt::TV_UNKNOWN:
ch='0';
break;
default:
assert(false);
}
value=ch+value;
}
switch(bvtype)
{
case IS_UNKNOWN:
if(type.id()==ID_string)
{
mp_integer int_value=binary2integer(value, false);
irep_idt s;
if(int_value>=string_numbering.size())
s=irep_idt();
else
s=string_numbering[int_value.to_long()];
return constant_exprt(s, type);
}
break;
case IS_RANGE:
{
mp_integer int_value=binary2integer(value, false);
mp_integer from=string2integer(type.get_string(ID_from));
constant_exprt value_expr(type);
value_expr.set_value(integer2string(int_value+from));
return value_expr;
}
break;
default:
case IS_C_ENUM:
constant_exprt value_expr(type);
value_expr.set_value(value);
return value_expr;
}
return nil_exprt();
}
bool boolbvt::type_conversion(
const typet &src_type, const bvt &src,
const typet &dest_type, bvt &dest)
{
bvtypet dest_bvtype=get_bvtype(dest_type);
bvtypet src_bvtype=get_bvtype(src_type);
if(src_bvtype==IS_C_BIT_FIELD)
return type_conversion(
c_bit_field_replacement_type(to_c_bit_field_type(src_type), ns), src, dest_type, dest);
if(dest_bvtype==IS_C_BIT_FIELD)
return type_conversion(
src_type, src, c_bit_field_replacement_type(to_c_bit_field_type(dest_type), ns), dest);
std::size_t src_width=src.size();
std::size_t dest_width=boolbv_width(dest_type);
if(dest_width==0 || src_width==0)
return true;
dest.clear();
dest.reserve(dest_width);
if(dest_type.id()==ID_complex)
{
if(src_type==dest_type.subtype())
{
forall_literals(it, src)
dest.push_back(*it);
// pad with zeros
for(std::size_t i=src.size(); i<dest_width; i++)
dest.push_back(const_literal(false));
return false;
}
else if(src_type.id()==ID_complex)
{
// recursively do both halfs
bvt lower, upper, lower_res, upper_res;
lower.assign(src.begin(), src.begin()+src.size()/2);
upper.assign(src.begin()+src.size()/2, src.end());
type_conversion(ns.follow(src_type.subtype()), lower, ns.follow(dest_type.subtype()), lower_res);
type_conversion(ns.follow(src_type.subtype()), upper, ns.follow(dest_type.subtype()), upper_res);
assert(lower_res.size()+upper_res.size()==dest_width);
dest=lower_res;
dest.insert(dest.end(), upper_res.begin(), upper_res.end());
return false;
}
}
if(src_type.id()==ID_complex)
{
assert(dest_type.id()!=ID_complex);
if(dest_type.id()==ID_signedbv ||
dest_type.id()==ID_unsignedbv ||
dest_type.id()==ID_floatbv ||
dest_type.id()==ID_fixedbv ||
dest_type.id()==ID_c_enum ||
dest_type.id()==ID_c_enum_tag ||
dest_type.id()==ID_bool)
{
// A cast from complex x to real T
// is (T) __real__ x.
bvt tmp_src(src);
tmp_src.resize(src.size()/2); // cut off imag part
return type_conversion(src_type.subtype(), tmp_src, dest_type, dest);
}
}
switch(dest_bvtype)
{
case IS_RANGE:
if(src_bvtype==IS_UNSIGNED ||
src_bvtype==IS_SIGNED ||
src_bvtype==IS_C_BOOL)
{
mp_integer dest_from=to_range_type(dest_type).get_from();
if(dest_from==0)
{
// do zero extension
dest.resize(dest_width);
for(std::size_t i=0; i<dest.size(); i++)
dest[i]=(i<src.size()?src[i]:const_literal(false));
return false;
}
}
else if(src_bvtype==IS_RANGE) // range to range
{
mp_integer src_from=to_range_type(src_type).get_from();
mp_integer dest_from=to_range_type(dest_type).get_from();
if(dest_from==src_from)
{
// do zero extension, if needed
dest=bv_utils.zero_extension(src, dest_width);
return false;
}
else
{
// need to do arithmetic: add src_from-dest_from
mp_integer offset=src_from-dest_from;
dest=
bv_utils.add(
bv_utils.zero_extension(src, dest_width),
bv_utils.build_constant(offset, dest_width));
}
return false;
}
break;
case IS_FLOAT: // to float
{
float_utilst float_utils(prop);
switch(src_bvtype)
{
case IS_FLOAT: // float to float
// we don't have a rounding mode here,
// which is why we refuse.
break;
case IS_SIGNED: // signed to float
case IS_C_ENUM:
float_utils.spec=to_floatbv_type(dest_type);
dest=float_utils.from_signed_integer(src);
return false;
case IS_UNSIGNED: // unsigned to float
case IS_C_BOOL: // _Bool to float
float_utils.spec=to_floatbv_type(dest_type);
dest=float_utils.from_unsigned_integer(src);
return false;
case IS_BV:
assert(src_width==dest_width);
dest=src;
return false;
default:
if(src_type.id()==ID_bool)
{
// bool to float
// build a one
ieee_floatt f;
f.spec=to_floatbv_type(dest_type);
f.from_integer(1);
dest=convert_bv(f.to_expr());
assert(src_width==1);
Forall_literals(it, dest)
*it=prop.land(*it, src[0]);
return false;
}
}
}
break;
case IS_FIXED:
if(src_bvtype==IS_FIXED)
{
// fixed to fixed
std::size_t dest_fraction_bits=to_fixedbv_type(dest_type).get_fraction_bits(),
dest_int_bits=dest_width-dest_fraction_bits;
std::size_t op_fraction_bits=to_fixedbv_type(src_type).get_fraction_bits(),
op_int_bits=src_width-op_fraction_bits;
dest.resize(dest_width);
// i == position after dot
// i == 0: first position after dot
for(std::size_t i=0; i<dest_fraction_bits; i++)
{
// position in bv
std::size_t p=dest_fraction_bits-i-1;
if(i<op_fraction_bits)
dest[p]=src[op_fraction_bits-i-1];
else
dest[p]=const_literal(false); // zero padding
}
for(std::size_t i=0; i<dest_int_bits; i++)
{
// position in bv
std::size_t p=dest_fraction_bits+i;
assert(p<dest_width);
if(i<op_int_bits)
dest[p]=src[i+op_fraction_bits];
else
dest[p]=src[src_width-1]; // sign extension
}
return false;
}
else if(src_bvtype==IS_BV)
{
assert(src_width==dest_width);
dest=src;
return false;
}
else if(src_bvtype==IS_UNSIGNED ||
src_bvtype==IS_SIGNED ||
src_bvtype==IS_C_BOOL ||
src_bvtype==IS_C_ENUM)
{
// integer to fixed
std::size_t dest_fraction_bits=
to_fixedbv_type(dest_type).get_fraction_bits();
for(std::size_t i=0; i<dest_fraction_bits; i++)
dest.push_back(const_literal(false)); // zero padding
for(std::size_t i=0; i<dest_width-dest_fraction_bits; i++)
{
literalt l;
if(i<src_width)
l=src[i];
else
{
if(src_bvtype==IS_SIGNED || src_bvtype==IS_C_ENUM)
l=src[src_width-1]; // sign extension
else
l=const_literal(false); // zero extension
}
dest.push_back(l);
}
return false;
}
else if(src_type.id()==ID_bool)
{
// bool to fixed
std::size_t fraction_bits=
to_fixedbv_type(dest_type).get_fraction_bits();
assert(src_width==1);
for(std::size_t i=0; i<dest_width; i++)
{
if(i==fraction_bits)
dest.push_back(src[0]);
else
dest.push_back(const_literal(false));
}
return false;
}
break;
case IS_UNSIGNED:
case IS_SIGNED:
case IS_C_ENUM:
switch(src_bvtype)
{
case IS_FLOAT: // float to integer
// we don't have a rounding mode here,
// which is why we refuse.
break;
case IS_FIXED: // fixed to integer
{
std::size_t op_fraction_bits=
to_fixedbv_type(src_type).get_fraction_bits();
for(std::size_t i=0; i<dest_width; i++)
{
if(i<src_width-op_fraction_bits)
dest.push_back(src[i+op_fraction_bits]);
else
{
if(dest_bvtype==IS_SIGNED)
dest.push_back(src[src_width-1]); // sign extension
else
dest.push_back(const_literal(false)); // zero extension
}
}
// we might need to round up in case of negative numbers
// e.g., (int)(-1.00001)==1
bvt fraction_bits_bv=src;
fraction_bits_bv.resize(op_fraction_bits);
literalt round_up=
prop.land(prop.lor(fraction_bits_bv), src.back());
dest=bv_utils.incrementer(dest, round_up);
return false;
}
case IS_UNSIGNED: // integer to integer
case IS_SIGNED:
case IS_C_ENUM:
case IS_C_BOOL:
{
// We do sign extension for any source type
// that is signed, independently of the
// destination type.
// E.g., ((short)(ulong)(short)-1)==-1
bool sign_extension=
src_bvtype==IS_SIGNED || src_bvtype==IS_C_ENUM;
for(std::size_t i=0; i<dest_width; i++)
{
if(i<src_width)
dest.push_back(src[i]);
else if(sign_extension)
dest.push_back(src[src_width-1]); // sign extension
else
dest.push_back(const_literal(false));
}
return false;
}
case IS_VERILOG_UNSIGNED: // verilog_unsignedbv to signed/unsigned/enum
{
for(std::size_t i=0; i<dest_width; i++)
{
std::size_t src_index=i*2; // we take every second bit
if(src_index<src_width)
dest.push_back(src[src_index]);
else // always zero-extend
dest.push_back(const_literal(false));
}
return false;
}
break;
case IS_VERILOG_SIGNED: // verilog_signedbv to signed/unsigned/enum
{
for(std::size_t i=0; i<dest_width; i++)
{
std::size_t src_index=i*2; // we take every second bit
if(src_index<src_width)
dest.push_back(src[src_index]);
else // always sign-extend
dest.push_back(src.back());
}
return false;
}
break;
default:
if(src_type.id()==ID_bool)
{
// bool to integer
assert(src_width==1);
for(std::size_t i=0; i<dest_width; i++)
{
if(i==0)
dest.push_back(src[0]);
else
dest.push_back(const_literal(false));
}
return false;
}
}
break;
case IS_VERILOG_UNSIGNED:
if(src_bvtype==IS_UNSIGNED ||
src_bvtype==IS_C_BOOL ||
src_type.id()==ID_bool)
{
for(std::size_t i=0, j=0; i<dest_width; i+=2, j++)
{
if(j<src_width)
dest.push_back(src[j]);
else
dest.push_back(const_literal(false));
dest.push_back(const_literal(false));
}
return false;
}
else if(src_bvtype==IS_SIGNED)
{
for(std::size_t i=0, j=0; i<dest_width; i+=2, j++)
{
if(j<src_width)
dest.push_back(src[j]);
else
dest.push_back(src.back());
dest.push_back(const_literal(false));
}
return false;
}
else if(src_bvtype==IS_VERILOG_UNSIGNED)
{
// verilog_unsignedbv to verilog_unsignedbv
dest=src;
if(dest_width<src_width)
dest.resize(dest_width);
else
{
dest=src;
while(dest.size()<dest_width)
{
dest.push_back(const_literal(false));
dest.push_back(const_literal(false));
}
}
return false;
}
break;
case IS_BV:
assert(src_width==dest_width);
dest=src;
return false;
case IS_C_BOOL:
dest.resize(dest_width, const_literal(false));
if(src_bvtype==IS_FLOAT)
{
float_utilst float_utils(prop);
float_utils.spec=to_floatbv_type(src_type);
dest[0]=!float_utils.is_zero(src);
}
else if(src_bvtype==IS_C_BOOL)
dest[0]=src[0];
else
dest[0]=!bv_utils.is_zero(src);
return false;
default:
if(dest_type.id()==ID_array)
{
if(src_width==dest_width)
{
dest=src;
return false;
}
}
else if(dest_type.id()==ID_struct)
{
const struct_typet &dest_struct =
to_struct_type(dest_type);
if(src_type.id()==ID_struct)
{
// we do subsets
dest.resize(dest_width, const_literal(false));
const struct_typet &op_struct =
to_struct_type(src_type);
const struct_typet::componentst &dest_comp=
dest_struct.components();
const struct_typet::componentst &op_comp=
op_struct.components();
// build offset maps
offset_mapt op_offsets, dest_offsets;
build_offset_map(op_struct, op_offsets);
build_offset_map(dest_struct, dest_offsets);
// build name map
typedef std::map<irep_idt, unsigned> op_mapt;
op_mapt op_map;
for(std::size_t i=0; i<op_comp.size(); i++)
op_map[op_comp[i].get_name()]=i;
// now gather required fields
for(std::size_t i=0;
i<dest_comp.size();
i++)
{
std::size_t offset=dest_offsets[i];
std::size_t comp_width=boolbv_width(dest_comp[i].type());
if(comp_width==0) continue;
op_mapt::const_iterator it=
op_map.find(dest_comp[i].get_name());
if(it==op_map.end())
{
// not found
// filling with free variables
for(std::size_t j=0; j<comp_width; j++)
dest[offset+j]=prop.new_variable();
}
else
{
// found
if(dest_comp[i].type()!=dest_comp[it->second].type())
{
// filling with free variables
for(std::size_t j=0; j<comp_width; j++)
dest[offset+j]=prop.new_variable();
}
else
{
std::size_t op_offset=op_offsets[it->second];
for(std::size_t j=0; j<comp_width; j++)
dest[offset+j]=src[op_offset+j];
}
}
}
return false;
}
}
}
return true;
}
void boolbvt::convert_unary_minus(const exprt &expr, bvt &bv)
{
const typet &type=ns.follow(expr.type());
unsigned width=boolbv_width(type);
if(width==0)
return conversion_failed(expr, bv);
const exprt::operandst &operands=expr.operands();
if(operands.size()!=1)
throw "unary minus takes one operand";
const exprt &op0=expr.op0();
const bvt &op_bv=convert_bv(op0);
bvtypet bvtype=get_bvtype(type);
bvtypet op_bvtype=get_bvtype(op0.type());
unsigned op_width=op_bv.size();
bool no_overflow=(expr.id()=="no-overflow-unary-minus");
if(op_width==0 || op_width!=width)
return conversion_failed(expr, bv);
if(bvtype==IS_UNKNOWN &&
(type.id()==ID_vector || type.id()==ID_complex))
{
const typet &subtype=ns.follow(type.subtype());
unsigned sub_width=boolbv_width(subtype);
if(sub_width==0 || width%sub_width!=0)
throw "unary-: unexpected vector operand width";
unsigned size=width/sub_width;
bv.resize(width);
for(unsigned i=0; i<size; i++)
{
bvt tmp_op;
tmp_op.resize(sub_width);
for(unsigned j=0; j<tmp_op.size(); j++)
{
assert(i*sub_width+j<op_bv.size());
tmp_op[j]=op_bv[i*sub_width+j];
}
bvt tmp_result;
if(type.subtype().id()==ID_floatbv)
{
float_utilst float_utils(prop);
float_utils.spec=to_floatbv_type(subtype);
tmp_result=float_utils.negate(tmp_op);
}
else
tmp_result=bv_utils.negate(tmp_op);
assert(tmp_result.size()==sub_width);
for(unsigned j=0; j<tmp_result.size(); j++)
{
assert(i*sub_width+j<bv.size());
bv[i*sub_width+j]=tmp_result[j];
}
}
return;
}
else if(bvtype==IS_FIXED && op_bvtype==IS_FIXED)
{
if(no_overflow)
bv=bv_utils.negate_no_overflow(op_bv);
else
bv=bv_utils.negate(op_bv);
return;
}
else if(bvtype==IS_FLOAT && op_bvtype==IS_FLOAT)
{
assert(!no_overflow);
float_utilst float_utils(prop);
float_utils.spec=to_floatbv_type(expr.type());
bv=float_utils.negate(op_bv);
return;
}
else if((op_bvtype==IS_SIGNED || op_bvtype==IS_UNSIGNED) &&
(bvtype==IS_SIGNED || bvtype==IS_UNSIGNED))
{
if(no_overflow)
prop.l_set_to(bv_utils.overflow_negate(op_bv), false);
if(no_overflow)
bv=bv_utils.negate_no_overflow(op_bv);
else
bv=bv_utils.negate(op_bv);
return;
}
conversion_failed(expr, bv);
}
