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unchecked-optional-access.cpp
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unchecked-optional-access.cpp
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// RUN: %check_clang_tidy %s bugprone-unchecked-optional-access %t -- -- -I %S/Inputs/unchecked-optional-access
#include "absl/types/optional.h"
void unchecked_value_access(const absl::optional<int> &opt) {
opt.value();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional value [bugprone-unchecked-optional-access]
}
void unchecked_deref_operator_access(const absl::optional<int> &opt) {
*opt;
// CHECK-MESSAGES: :[[@LINE-1]]:4: warning: unchecked access to optional value
}
struct Foo {
void foo() const {}
};
void unchecked_arrow_operator_access(const absl::optional<Foo> &opt) {
opt->foo();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional value
}
void checked_access(const absl::optional<int> &opt) {
if (opt.has_value()) {
opt.value();
}
}
template <typename T>
void function_template_without_user(const absl::optional<T> &opt) {
opt.value(); // no-warning
}
template <typename T>
void function_template_with_user(const absl::optional<T> &opt) {
opt.value();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional value
}
void function_template_user(const absl::optional<int> &opt) {
// Instantiate the f3 function template so that it gets matched by the check.
function_template_with_user(opt);
}
template <typename T>
void function_template_with_specialization(const absl::optional<int> &opt) {
opt.value(); // no-warning
}
template <>
void function_template_with_specialization<int>(
const absl::optional<int> &opt) {
opt.value();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional value
}
template <typename T>
class ClassTemplateWithSpecializations {
void f(const absl::optional<int> &opt) {
opt.value(); // no-warning
}
};
template <typename T>
class ClassTemplateWithSpecializations<T *> {
void f(const absl::optional<int> &opt) {
opt.value(); // no-warning
}
};
template <>
class ClassTemplateWithSpecializations<int> {
void f(const absl::optional<int> &opt) {
opt.value();
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: unchecked access to optional
}
};
// The templates below are not instantiated and CFGs can not be properly built
// for them. They are here to make sure that the checker does not crash, but
// instead ignores non-instantiated templates.
template <typename T>
struct C1 {};
template <typename T>
struct C2 : public C1<T> {
~C2() {}
};
template <typename T, template <class> class B>
struct C3 : public B<T> {
~C3() {}
};
void multiple_unchecked_accesses(absl::optional<int> opt1,
absl::optional<int> opt2) {
for (int i = 0; i < 10; i++) {
opt1.value();
// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: unchecked access to optional
}
opt2.value();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional value
}
class C4 {
explicit C4(absl::optional<int> opt) : foo_(opt.value()) {
// CHECK-MESSAGES: :[[@LINE-1]]:47: warning: unchecked access to optional
}
int foo_;
};
// llvm#59705
namespace std
{
template <typename T>
constexpr T&& forward(T& type) noexcept {
return static_cast<T&&>(type);
}
template <typename T>
constexpr T&& forward(T&& type) noexcept {
return static_cast<T&&>(type);
}
}
void std_forward_copy(absl::optional<int> opt) {
std::forward<absl::optional<int>>(opt).value();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional
}
void std_forward_copy_safe(absl::optional<int> opt) {
if (!opt) return;
std::forward<absl::optional<int>>(opt).value();
}
void std_forward_copy(absl::optional<int>& opt) {
std::forward<absl::optional<int>>(opt).value();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional
}
void std_forward_lvalue_ref_safe(absl::optional<int>& opt) {
if (!opt) return;
std::forward<absl::optional<int>>(opt).value();
}
void std_forward_copy(absl::optional<int>&& opt) {
std::forward<absl::optional<int>>(opt).value();
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: unchecked access to optional
}
void std_forward_rvalue_ref_safe(absl::optional<int>&& opt) {
if (!opt) return;
std::forward<absl::optional<int>>(opt).value();
}