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integer dereferences are now re-written to a custom expression #1453

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Merged
merged 1 commit into from
Oct 8, 2017
Merged

integer dereferences are now re-written to a custom expression #1453

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11 changes: 4 additions & 7 deletions src/pointer-analysis/dereference.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -264,20 +264,17 @@ exprt dereferencet::dereference_typecast(
return dereference_rec(op, offset, type); // just pass down
else if(op_type.id()==ID_signedbv || op_type.id()==ID_unsignedbv)
{
// We got an integer-typed address A. We turn this back (!)
// into *(type *)(A+offset), and then let some other layer
// worry about it.
// We got an integer-typed address A. We turn this
// into integer_dereference(A+offset),
// and then let some other layer worry about it.

exprt integer=op;

if(!offset.is_zero())
integer=
plus_exprt(offset, typecast_exprt(op, offset.type()));

exprt new_typecast=
typecast_exprt(integer, pointer_type(type));

return dereference_exprt(new_typecast, type);
return unary_exprt(ID_integer_dereference, integer, type);
}
else
throw "dereferencet: unexpected cast";
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1 change: 1 addition & 0 deletions src/util/irep_ids.def
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Expand Up @@ -823,6 +823,7 @@ IREP_ID_ONE(array_replace)
IREP_ID_ONE(switch_case_number)
IREP_ID_ONE(java_array_access)
IREP_ID_ONE(java_member_access)
IREP_ID_ONE(integer_dereference)

#undef IREP_ID_ONE
#undef IREP_ID_TWO