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prophecy_r_or_w_ok_exprt lowering: adjust for dynamic/static objects #8629

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prophecy_r_or_w_ok_exprt lowering: adjust for dynamic/static objects #8629

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37 changes: 37 additions & 0 deletions src/util/pointer_expr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,9 +12,11 @@ Author: Daniel Kroening, [email protected]
#include "byte_operators.h"
#include "c_types.h"
#include "expr_util.h"
#include "namespace.h"
#include "pointer_offset_size.h"
#include "pointer_predicates.h"
#include "simplify_expr.h"
#include "symbol.h"

void dynamic_object_exprt::set_instance(unsigned int instance)
{
Expand Down Expand Up @@ -247,6 +249,41 @@ exprt pointer_in_range_exprt::lower() const

exprt prophecy_r_or_w_ok_exprt::lower(const namespacet &ns) const
{
exprt base_ptr = skip_typecast(pointer());
if(auto plus_expr = expr_try_dynamic_cast<plus_exprt>(base_ptr))
{
if(plus_expr->op0().id() == ID_address_of)
base_ptr = plus_expr->op0();
}
if(auto address_of = expr_try_dynamic_cast<address_of_exprt>(base_ptr))
{
const exprt &root_object =
object_descriptor_exprt::root_object(address_of->object());
if(auto symbol_expr = expr_try_dynamic_cast<symbol_exprt>(root_object))
{
const symbolt *s_ptr = nullptr;
if(
!ns.lookup(symbol_expr->get_identifier(), s_ptr) &&
s_ptr->is_static_lifetime)
{
return and_exprt{
{not_exprt{null_object(pointer())},
not_exprt{is_invalid_pointer_exprt{pointer()}},
not_exprt{object_lower_bound(pointer(), nil_exprt())},
not_exprt{object_upper_bound(pointer(), size())}}};
}
else if(symbol_expr->get_identifier().starts_with(SYMEX_DYNAMIC_PREFIX
"::"))
{
return and_exprt{
{not_exprt{null_object(pointer())},
not_exprt{is_invalid_pointer_exprt{pointer()}},
not_exprt{same_object(pointer(), deallocated_ptr())},
not_exprt{object_lower_bound(pointer(), nil_exprt())},
not_exprt{object_upper_bound(pointer(), size())}}};
}
}
}
return and_exprt{
{not_exprt{null_object(pointer())},
not_exprt{is_invalid_pointer_exprt{pointer()}},
Expand Down
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