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Extensions to dereferencing as used by path-symex #152

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Extensions to dereferencing as used by path-symex #152

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89fa342
Extended dereferencet to handle more cases, explicitly report back wh…
tautschnig Mar 4, 2016
93d1c78
symex: handle dereferencing failures
tautschnig Jun 26, 2016
26790dd
Pointer dereferencing of integers is invalid
tautschnig Jun 26, 2016
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32 changes: 31 additions & 1 deletion src/path-symex/path_symex_state_read.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -500,7 +500,37 @@ exprt path_symex_statet::dereference_rec(
exprt address=read(dereference_expr.pointer(), propagate);

// now hand over to dereference
exprt address_dereferenced=::dereference(address, var_map.ns);
exprt is_invalid;

exprt address_dereferenced=
::dereference(address, var_map.ns, is_invalid);

if(!is_invalid.is_false())
{
#ifdef DEBUG
std::cout << "Pointer " << from_expr(var_map.ns, "", src.op0())
<< " may be invalid when "
<< from_expr(var_map.ns, "", is_invalid)
<< " evaluates to true.\n";
#endif

irep_idt id="symex::nondet"+std::to_string(var_map.nondet_count);
var_map.nondet_count++;

auxiliary_symbolt nondet_symbol;
nondet_symbol.name=id;
nondet_symbol.base_name=id;
nondet_symbol.type=src.type();
var_map.new_symbols.add(nondet_symbol);

symbol_exprt nondet=nondet_symbol.symbol_expr();

if(is_invalid.is_true())
address_dereferenced=nondet;
else
address_dereferenced=
if_exprt(is_invalid, nondet, address_dereferenced);
}

// the dereferenced address is a mixture of non-SSA and SSA symbols
// (e.g., if-guards and array indices)
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