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Merged
merged 1 commit into from
Oct 31, 2018
Merged

Remove member_offset_iterator #3185

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62 changes: 18 additions & 44 deletions src/util/pointer_offset_size.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -21,71 +21,45 @@ Author: Daniel Kroening, kroening@kroening.com
#include "ssa_expr.h"
#include "std_expr.h"

member_offset_iterator::member_offset_iterator(
const struct_typet &_type,
const namespacet &_ns):
current({0, 0}),
type(_type),
ns(_ns),
bit_field_bits(0)
optionalt<mp_integer> member_offset(
const struct_typet &type,
const irep_idt &member,
const namespacet &ns)
{
}
mp_integer result = 0;
std::size_t bit_field_bits = 0;

member_offset_iterator &member_offset_iterator::operator++()
{
if(current.second!=-1) // Already failed?
for(const auto &comp : type.components())
{
const auto &comp=type.components()[current.first];
if(comp.type().id()==ID_c_bit_field)
if(comp.get_name() == member)
return result;

if(comp.type().id() == ID_c_bit_field)
{
// take the extra bytes needed
std::size_t w=to_c_bit_field_type(comp.type()).get_width();
const std::size_t w = to_c_bit_field_type(comp.type()).get_width();
bit_field_bits += w;
current.second += bit_field_bits / 8;
result += bit_field_bits / 8;
bit_field_bits %= 8;
}
else if(comp.type().id() == ID_bool)
{
++bit_field_bits;
current.second += bit_field_bits / 8;
result += bit_field_bits / 8;
bit_field_bits %= 8;
}
else
{
DATA_INVARIANT(
bit_field_bits == 0, "padding ensures offset at byte boundaries");
const typet &subtype=comp.type();

auto sub_size = pointer_offset_size(subtype, ns);

const auto sub_size = pointer_offset_size(comp.type(), ns);
if(!sub_size.has_value())
current.second=-1; // give up
return {};
else
current.second += *sub_size;
result += *sub_size;
}
}
++current.first;
return *this;
}

optionalt<mp_integer> member_offset(
const struct_typet &type,
const irep_idt &member,
const namespacet &ns)
{
const struct_typet::componentst &components=type.components();
member_offset_iterator offsets(type, ns);

for(struct_typet::componentst::const_iterator
it=components.begin();
it!=components.end() && offsets->second!=-1;
++it, ++offsets)
{
if(it->get_name()==member)
break;
}

return offsets->second;
return result;
}

optionalt<mp_integer> member_offset_bits(
Expand Down
16 changes: 0 additions & 16 deletions src/util/pointer_offset_size.h
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Original file line number Diff line number Diff line change
Expand Up @@ -25,22 +25,6 @@ class constant_exprt;

// these return 'nullopt' on failure

// NOLINTNEXTLINE(readability/identifiers)
class member_offset_iterator
{
typedef std::pair<size_t, mp_integer> refst;
refst current;
const struct_typet &type;
const namespacet &ns;
size_t bit_field_bits;
public:
member_offset_iterator(const struct_typet &_type,
const namespacet &_ns);
member_offset_iterator &operator++();
const refst &operator*() const { return current; }
const refst* operator->() const { return &current; }
};

optionalt<mp_integer> member_offset(
const struct_typet &type,
const irep_idt &member,
Expand Down