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https://sourceware.org/git/binutils-gdb.git
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497 lines
13 KiB
C
497 lines
13 KiB
C
/* Self tests for array_view for GDB, the GNU debugger.
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "selftest.h"
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#include "common/array-view.h"
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#include <array>
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namespace selftests {
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namespace array_view_tests {
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/* Triviality checks. */
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#define CHECK_TRAIT(TRAIT) \
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static_assert (std::TRAIT<gdb::array_view<gdb_byte>>::value, "")
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#if HAVE_IS_TRIVIALLY_COPYABLE
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CHECK_TRAIT (is_trivially_copyable);
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CHECK_TRAIT (is_trivially_move_assignable);
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CHECK_TRAIT (is_trivially_move_constructible);
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CHECK_TRAIT (is_trivially_destructible);
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#endif
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#undef CHECK_TRAIT
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/* Wrapper around std::is_convertible to make the code using it a bit
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shorter. (With C++14 we'd use a variable template instead.) */
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template<typename From, typename To>
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static constexpr bool
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is_convertible ()
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{
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return std::is_convertible<From, To>::value;
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}
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/* Check for implicit conversion to immutable and mutable views. */
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static constexpr bool
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check_convertible ()
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{
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using T = gdb_byte;
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using gdb::array_view;
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return (true
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/* immutable array_view */
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&& is_convertible<const T (&) [1], array_view<const T>> ()
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&& is_convertible<T (&) [1], array_view<const T>> ()
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&& is_convertible<const T, array_view<const T>> ()
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&& is_convertible<T, array_view<const T>> ()
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/* mutable array_view */
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&& is_convertible<T (&) [1], array_view<T>> ()
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&& !is_convertible<const T (&) [1], array_view<T>> ()
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&& is_convertible<T, array_view<T>> ()
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&& !is_convertible<const T, array_view<T>> ()
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/* While float is implicitly convertible to gdb_byte, we
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don't want implicit float->array_view<gdb_byte>
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conversion. */
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&& !is_convertible<float, array_view<const T>> ()
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&& !is_convertible<float, array_view<T>> ());
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}
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static_assert (check_convertible (), "");
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namespace no_slicing
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{
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struct A { int i; };
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struct B : A { int j; };
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struct C : A { int l; };
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/* Check that there's no array->view conversion for arrays of derived
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types or subclasses. */
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static constexpr bool
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check ()
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{
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using gdb::array_view;
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return (true
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/* array->view */
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&& is_convertible <A (&)[1], array_view<A>> ()
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&& !is_convertible <B (&)[1], array_view<A>> ()
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&& !is_convertible <C (&)[1], array_view<A>> ()
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&& !is_convertible <A (&)[1], array_view<B>> ()
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&& is_convertible <B (&)[1], array_view<B>> ()
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&& !is_convertible <C (&)[1], array_view<B>> ()
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/* elem->view */
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&& is_convertible <A, array_view<A>> ()
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&& !is_convertible <B, array_view<A>> ()
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&& !is_convertible <C, array_view<A>> ()
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&& !is_convertible <A, array_view<B>> ()
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&& is_convertible <B, array_view<B>> ()
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&& !is_convertible <C, array_view<B>> ());
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}
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} /* namespace no_slicing */
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static_assert (no_slicing::check (), "");
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/* Check that array_view implicitly converts from std::vector. */
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static constexpr bool
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check_convertible_from_std_vector ()
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{
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using gdb::array_view;
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using T = gdb_byte;
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/* Note there's no such thing as std::vector<const T>. */
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return (true
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&& is_convertible <std::vector<T>, array_view<T>> ()
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&& is_convertible <std::vector<T>, array_view<const T>> ());
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}
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static_assert (check_convertible_from_std_vector (), "");
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/* Check that array_view implicitly converts from std::array. */
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static constexpr bool
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check_convertible_from_std_array ()
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{
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using gdb::array_view;
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using T = gdb_byte;
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/* Note: a non-const T view can't refer to a const T array. */
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return (true
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&& is_convertible <std::array<T, 1>, array_view<T>> ()
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&& is_convertible <std::array<T, 1>, array_view<const T>> ()
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&& !is_convertible <std::array<const T, 1>, array_view<T>> ()
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&& is_convertible <std::array<const T, 1>, array_view<const T>> ());
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}
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static_assert (check_convertible_from_std_array (), "");
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/* Check that VIEW views C (a container like std::vector/std::array)
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correctly. */
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template<typename View, typename Container>
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static bool
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check_container_view (const View &view, const Container &c)
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{
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if (view.empty ())
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return false;
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if (view.size () != c.size ())
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return false;
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if (view.data () != c.data ())
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return false;
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for (size_t i = 0; i < c.size (); i++)
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{
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if (&view[i] != &c[i])
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return false;
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if (view[i] != c[i])
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return false;
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}
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return true;
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}
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/* Check that VIEW views E (an object of the type of a view element)
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correctly. */
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template<typename View, typename Elem>
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static bool
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check_elem_view (const View &view, const Elem &e)
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{
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if (view.empty ())
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return false;
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if (view.size () != 1)
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return false;
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if (view.data () != &e)
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return false;
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if (&view[0] != &e)
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return false;
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if (view[0] != e)
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return false;
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return true;
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}
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/* Check for operator[]. The first overload is taken iff
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'view<T>()[0] = T()' is a valid expression. */
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template<typename View,
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typename = decltype (std::declval<View> ()[0]
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= std::declval<typename View::value_type> ())>
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static bool
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check_op_subscript (const View &view)
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{
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return true;
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}
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/* This overload is taken iff 'view<T>()[0] = T()' is not a valid
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expression. */
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static bool
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check_op_subscript (...)
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{
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return false;
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}
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/* Check construction with pointer + size. This is a template in
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order to test both gdb_byte and const gdb_byte. */
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template<typename T>
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static void
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check_ptr_size_ctor ()
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{
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T data[] = {0x11, 0x22, 0x33, 0x44};
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gdb::array_view<T> view (data + 1, 2);
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SELF_CHECK (!view.empty ());
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SELF_CHECK (view.size () == 2);
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SELF_CHECK (view.data () == &data[1]);
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SELF_CHECK (view[0] == data[1]);
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SELF_CHECK (view[1] == data[2]);
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gdb::array_view<const T> cview (data + 1, 2);
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SELF_CHECK (!cview.empty ());
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SELF_CHECK (cview.size () == 2);
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SELF_CHECK (cview.data () == &data[1]);
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SELF_CHECK (cview[0] == data[1]);
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SELF_CHECK (cview[1] == data[2]);
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}
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/* Asserts std::is_constructible. */
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template<typename T, typename... Args>
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static constexpr bool
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require_not_constructible ()
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{
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static_assert (!std::is_constructible<T, Args...>::value, "");
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/* constexpr functions can't return void in C++11 (N3444). */
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return true;
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};
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/* Check the array_view<T>(PTR, SIZE) ctor, when T is a pointer. */
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void
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check_ptr_size_ctor2 ()
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{
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struct A {};
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A an_a;
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A *array[] = { &an_a };
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const A * const carray[] = { &an_a };
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gdb::array_view<A *> v1 = {array, ARRAY_SIZE (array)};
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gdb::array_view<A *> v2 = {array, (char) ARRAY_SIZE (array)};
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gdb::array_view<A * const> v3 = {array, ARRAY_SIZE (array)};
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gdb::array_view<const A * const> cv1 = {carray, ARRAY_SIZE (carray)};
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require_not_constructible<gdb::array_view<A *>, decltype (carray), size_t> ();
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SELF_CHECK (v1[0] == array[0]);
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SELF_CHECK (v2[0] == array[0]);
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SELF_CHECK (v3[0] == array[0]);
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SELF_CHECK (!v1.empty ());
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SELF_CHECK (v1.size () == 1);
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SELF_CHECK (v1.data () == &array[0]);
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SELF_CHECK (cv1[0] == carray[0]);
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SELF_CHECK (!cv1.empty ());
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SELF_CHECK (cv1.size () == 1);
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SELF_CHECK (cv1.data () == &carray[0]);
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}
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/* Check construction with a pair of pointers. This is a template in
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order to test both gdb_byte and const gdb_byte. */
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template<typename T>
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static void
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check_ptr_ptr_ctor ()
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{
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T data[] = {0x11, 0x22, 0x33, 0x44};
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gdb::array_view<T> view (data + 1, data + 3);
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SELF_CHECK (!view.empty ());
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SELF_CHECK (view.size () == 2);
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SELF_CHECK (view.data () == &data[1]);
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SELF_CHECK (view[0] == data[1]);
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SELF_CHECK (view[1] == data[2]);
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gdb_byte array[] = {0x11, 0x22, 0x33, 0x44};
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const gdb_byte *p1 = array;
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gdb_byte *p2 = array + ARRAY_SIZE (array);
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gdb::array_view<const gdb_byte> view2 (p1, p2);
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}
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/* Check construction with a pair of pointers of mixed constness. */
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static void
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check_ptr_ptr_mixed_cv ()
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{
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gdb_byte array[] = {0x11, 0x22, 0x33, 0x44};
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const gdb_byte *cp = array;
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gdb_byte *p = array;
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gdb::array_view<const gdb_byte> view1 (cp, p);
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gdb::array_view<const gdb_byte> view2 (p, cp);
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SELF_CHECK (view1.empty ());
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SELF_CHECK (view2.empty ());
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}
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/* Check range-for support (i.e., begin()/end()). This is a template
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in order to test both gdb_byte and const gdb_byte. */
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template<typename T>
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static void
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check_range_for ()
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{
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T data[] = {1, 2, 3, 4};
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gdb::array_view<T> view (data);
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typename std::decay<T>::type sum = 0;
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for (auto &elem : view)
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sum += elem;
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SELF_CHECK (sum == 1 + 2 + 3 + 4);
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}
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/* Entry point. */
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static void
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run_tests ()
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{
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/* Empty views. */
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{
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constexpr gdb::array_view<gdb_byte> view1;
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constexpr gdb::array_view<const gdb_byte> view2;
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static_assert (view1.empty (), "");
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static_assert (view1.data () == nullptr, "");
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static_assert (view1.size () == 0, "");
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static_assert (view2.empty (), "");
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static_assert (view2.size () == 0, "");
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static_assert (view2.data () == nullptr, "");
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}
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std::vector<gdb_byte> vec = {0x11, 0x22, 0x33, 0x44 };
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std::array<gdb_byte, 4> array = {{0x11, 0x22, 0x33, 0x44}};
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/* Various tests of views over std::vector. */
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{
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gdb::array_view<gdb_byte> view = vec;
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SELF_CHECK (check_container_view (view, vec));
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gdb::array_view<const gdb_byte> cview = vec;
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SELF_CHECK (check_container_view (cview, vec));
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}
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/* Likewise, over std::array. */
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{
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gdb::array_view<gdb_byte> view = array;
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SELF_CHECK (check_container_view (view, array));
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gdb::array_view<gdb_byte> cview = array;
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SELF_CHECK (check_container_view (cview, array));
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}
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/* op=(std::vector/std::array/elem) */
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{
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gdb::array_view<gdb_byte> view;
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view = vec;
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SELF_CHECK (check_container_view (view, vec));
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view = std::move (vec);
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SELF_CHECK (check_container_view (view, vec));
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view = array;
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SELF_CHECK (check_container_view (view, array));
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view = std::move (array);
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SELF_CHECK (check_container_view (view, array));
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gdb_byte elem = 0;
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view = elem;
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SELF_CHECK (check_elem_view (view, elem));
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view = std::move (elem);
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SELF_CHECK (check_elem_view (view, elem));
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}
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/* Test copy/move ctor and mutable->immutable conversion. */
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{
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gdb_byte data[] = {0x11, 0x22, 0x33, 0x44};
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gdb::array_view<gdb_byte> view1 = data;
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gdb::array_view<gdb_byte> view2 = view1;
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gdb::array_view<gdb_byte> view3 = std::move (view1);
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gdb::array_view<const gdb_byte> cview1 = data;
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gdb::array_view<const gdb_byte> cview2 = cview1;
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gdb::array_view<const gdb_byte> cview3 = std::move (cview1);
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SELF_CHECK (view1[0] == data[0]);
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SELF_CHECK (view2[0] == data[0]);
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SELF_CHECK (view3[0] == data[0]);
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SELF_CHECK (cview1[0] == data[0]);
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SELF_CHECK (cview2[0] == data[0]);
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SELF_CHECK (cview3[0] == data[0]);
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}
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/* Same, but op=(view). */
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{
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gdb_byte data[] = {0x55, 0x66, 0x77, 0x88};
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gdb::array_view<gdb_byte> view1;
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gdb::array_view<gdb_byte> view2;
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gdb::array_view<gdb_byte> view3;
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gdb::array_view<const gdb_byte> cview1;
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gdb::array_view<const gdb_byte> cview2;
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gdb::array_view<const gdb_byte> cview3;
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view1 = data;
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view2 = view1;
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view3 = std::move (view1);
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cview1 = data;
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cview2 = cview1;
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cview3 = std::move (cview1);
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SELF_CHECK (view1[0] == data[0]);
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SELF_CHECK (view2[0] == data[0]);
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SELF_CHECK (view3[0] == data[0]);
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SELF_CHECK (cview1[0] == data[0]);
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SELF_CHECK (cview2[0] == data[0]);
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SELF_CHECK (cview3[0] == data[0]);
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}
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/* op[] */
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{
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std::vector<gdb_byte> vec = {0x11, 0x22};
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gdb::array_view<gdb_byte> view = vec;
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gdb::array_view<const gdb_byte> cview = vec;
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/* Check that op[] on a non-const view of non-const T returns a
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mutable reference. */
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view[0] = 0x33;
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SELF_CHECK (vec[0] == 0x33);
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/* OTOH, check that assigning through op[] on a view of const T
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wouldn't compile. */
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SELF_CHECK (!check_op_subscript (cview));
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/* For completeness. */
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SELF_CHECK (check_op_subscript (view));
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}
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check_ptr_size_ctor<const gdb_byte> ();
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check_ptr_size_ctor<gdb_byte> ();
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check_ptr_size_ctor2 ();
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check_ptr_ptr_ctor<const gdb_byte> ();
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check_ptr_ptr_ctor<gdb_byte> ();
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check_ptr_ptr_mixed_cv ();
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check_range_for<gdb_byte> ();
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check_range_for<const gdb_byte> ();
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/* Check that the right ctor overloads are taken when the element is
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a container. */
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{
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using Vec = std::vector<gdb_byte>;
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Vec vecs[3];
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gdb::array_view<Vec> view_array = vecs;
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SELF_CHECK (view_array.size () == 3);
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Vec elem;
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gdb::array_view<Vec> view_elem = elem;
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SELF_CHECK (view_elem.size () == 1);
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}
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}
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} /* namespace array_view_tests */
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} /* namespace selftests */
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void
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_initialize_array_view_selftests ()
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{
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selftests::register_test ("array_view",
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selftests::array_view_tests::run_tests);
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}
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