//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Make sure that std::string_view's iterators check for OOB accesses when the debug mode is enabled.
// REQUIRES: has-unix-headers, libcpp-has-abi-bounded-iterators
// UNSUPPORTED: libcpp-hardening-mode=none
#include <iterator>
#include <string_view>
#include "check_assertion.h"
template <typename Iter>
void test_iterator(Iter begin, Iter end, bool reverse) {
ptrdiff_t distance = std::distance(begin, end);
// Dereferencing an iterator at the end.
{
TEST_LIBCPP_ASSERT_FAILURE(
*end,
reverse ? "__bounded_iter::operator--: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator*: Attempt to dereference an iterator at the end");
#if _LIBCPP_STD_VER >= 20
// In C++20 mode, std::reverse_iterator implements operator->, but not operator*, with
// std::prev instead of operator--. std::prev ultimately calls operator+
TEST_LIBCPP_ASSERT_FAILURE(
end.operator->(),
reverse ? "__bounded_iter::operator+=: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator->: Attempt to dereference an iterator at the end");
#else
TEST_LIBCPP_ASSERT_FAILURE(
end.operator->(),
reverse ? "__bounded_iter::operator--: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator->: Attempt to dereference an iterator at the end");
#endif
}
// Incrementing an iterator past the end.
{
[[maybe_unused]] const char* msg =
reverse ? "__bounded_iter::operator--: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator++: Attempt to advance an iterator past the end";
auto it = end;
TEST_LIBCPP_ASSERT_FAILURE(it++, msg);
it = end;
TEST_LIBCPP_ASSERT_FAILURE(++it, msg);
}
// Decrementing an iterator past the start.
{
[[maybe_unused]] const char* msg =
reverse ? "__bounded_iter::operator++: Attempt to advance an iterator past the end"
: "__bounded_iter::operator--: Attempt to rewind an iterator past the start";
auto it = begin;
TEST_LIBCPP_ASSERT_FAILURE(it--, msg);
it = begin;
TEST_LIBCPP_ASSERT_FAILURE(--it, msg);
}
// Advancing past the end with operator+= and operator+.
{
[[maybe_unused]] const char* msg =
reverse ? "__bounded_iter::operator-=: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator+=: Attempt to advance an iterator past the end";
auto it = end;
TEST_LIBCPP_ASSERT_FAILURE(it += 1, msg);
TEST_LIBCPP_ASSERT_FAILURE(end + 1, msg);
it = begin;
TEST_LIBCPP_ASSERT_FAILURE(it += (distance + 1), msg);
TEST_LIBCPP_ASSERT_FAILURE(begin + (distance + 1), msg);
}
// Advancing past the end with operator-= and operator-.
{
[[maybe_unused]] const char* msg =
reverse ? "__bounded_iter::operator+=: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator-=: Attempt to advance an iterator past the end";
auto it = end;
TEST_LIBCPP_ASSERT_FAILURE(it -= (-1), msg);
TEST_LIBCPP_ASSERT_FAILURE(end - (-1), msg);
it = begin;
TEST_LIBCPP_ASSERT_FAILURE(it -= (-distance - 1), msg);
TEST_LIBCPP_ASSERT_FAILURE(begin - (-distance - 1), msg);
}
// Rewinding past the start with operator+= and operator+.
{
[[maybe_unused]] const char* msg =
reverse ? "__bounded_iter::operator-=: Attempt to advance an iterator past the end"
: "__bounded_iter::operator+=: Attempt to rewind an iterator past the start";
auto it = begin;
TEST_LIBCPP_ASSERT_FAILURE(it += (-1), msg);
TEST_LIBCPP_ASSERT_FAILURE(begin + (-1), msg);
it = end;
TEST_LIBCPP_ASSERT_FAILURE(it += (-distance - 1), msg);
TEST_LIBCPP_ASSERT_FAILURE(end + (-distance - 1), msg);
}
// Rewinding past the start with operator-= and operator-.
{
[[maybe_unused]] const char* msg =
reverse ? "__bounded_iter::operator+=: Attempt to advance an iterator past the end"
: "__bounded_iter::operator-=: Attempt to rewind an iterator past the start";
auto it = begin;
TEST_LIBCPP_ASSERT_FAILURE(it -= 1, msg);
TEST_LIBCPP_ASSERT_FAILURE(begin - 1, msg);
it = end;
TEST_LIBCPP_ASSERT_FAILURE(it -= (distance + 1), msg);
TEST_LIBCPP_ASSERT_FAILURE(end - (distance + 1), msg);
}
// Out-of-bounds operator[].
{
[[maybe_unused]] const char* end_msg =
reverse ? "__bounded_iter::operator--: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator[]: Attempt to index an iterator at or past the end";
[[maybe_unused]] const char* past_end_msg =
reverse ? "__bounded_iter::operator-=: Attempt to rewind an iterator past the start"
: "__bounded_iter::operator[]: Attempt to index an iterator at or past the end";
[[maybe_unused]] const char* past_start_msg =
reverse ? "__bounded_iter::operator-=: Attempt to advance an iterator past the end"
: "__bounded_iter::operator[]: Attempt to index an iterator past the start";
TEST_LIBCPP_ASSERT_FAILURE(begin[distance], end_msg);
TEST_LIBCPP_ASSERT_FAILURE(begin[distance + 1], past_end_msg);
TEST_LIBCPP_ASSERT_FAILURE(begin[-1], past_start_msg);
TEST_LIBCPP_ASSERT_FAILURE(begin[-99], past_start_msg);
auto it = begin + 1;
TEST_LIBCPP_ASSERT_FAILURE(it[distance - 1], end_msg);
TEST_LIBCPP_ASSERT_FAILURE(it[distance], past_end_msg);
TEST_LIBCPP_ASSERT_FAILURE(it[-2], past_start_msg);
TEST_LIBCPP_ASSERT_FAILURE(it[-99], past_start_msg);
}
}
int main(int, char**) {
std::string_view const str("hello world");
// string_view::iterator
test_iterator(str.begin(), str.end(), /*reverse=*/false);
// string_view::const_iterator
test_iterator(str.cbegin(), str.cend(), /*reverse=*/false);
// string_view::reverse_iterator
test_iterator(str.rbegin(), str.rend(), /*reverse=*/true);
// string_view::const_reverse_iterator
test_iterator(str.crbegin(), str.crend(), /*reverse=*/true);
return 0;
}
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