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/* Self tests for array_view for GDB, the GNU debugger.
Copyright (C) 2017-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbsupport/selftest.h"
#include "gdbsupport/array-view.h"
#include <array>
namespace selftests {
namespace array_view_tests {
/* Triviality checks. */
#define CHECK_TRAIT(TRAIT) \
static_assert (std::TRAIT<gdb::array_view<gdb_byte>>::value, "")
#if HAVE_IS_TRIVIALLY_COPYABLE
CHECK_TRAIT (is_trivially_copyable);
CHECK_TRAIT (is_trivially_move_assignable);
CHECK_TRAIT (is_trivially_move_constructible);
CHECK_TRAIT (is_trivially_destructible);
#endif
#undef CHECK_TRAIT
/* Wrapper around std::is_convertible to make the code using it a bit
shorter. (With C++14 we'd use a variable template instead.) */
template<typename From, typename To>
static constexpr bool
is_convertible ()
{
return std::is_convertible<From, To>::value;
}
/* Check for implicit conversion to immutable and mutable views. */
static constexpr bool
check_convertible ()
{
using T = gdb_byte;
using gdb::array_view;
return (true
/* immutable array_view */
&& is_convertible<const T (&) [1], array_view<const T>> ()
&& is_convertible<T (&) [1], array_view<const T>> ()
&& is_convertible<const T, array_view<const T>> ()
&& is_convertible<T, array_view<const T>> ()
/* mutable array_view */
&& is_convertible<T (&) [1], array_view<T>> ()
&& !is_convertible<const T (&) [1], array_view<T>> ()
&& is_convertible<T, array_view<T>> ()
&& !is_convertible<const T, array_view<T>> ()
/* While float is implicitly convertible to gdb_byte, we
don't want implicit float->array_view<gdb_byte>
conversion. */
&& !is_convertible<float, array_view<const T>> ()
&& !is_convertible<float, array_view<T>> ());
}
static_assert (check_convertible (), "");
namespace no_slicing
{
struct A { int i; };
struct B : A { int j; };
struct C : A { int l; };
/* Check that there's no array->view conversion for arrays of derived
types or subclasses. */
static constexpr bool
check ()
{
using gdb::array_view;
return (true
/* array->view */
&& is_convertible <A (&)[1], array_view<A>> ()
&& !is_convertible <B (&)[1], array_view<A>> ()
&& !is_convertible <C (&)[1], array_view<A>> ()
&& !is_convertible <A (&)[1], array_view<B>> ()
&& is_convertible <B (&)[1], array_view<B>> ()
&& !is_convertible <C (&)[1], array_view<B>> ()
/* elem->view */
&& is_convertible <A, array_view<A>> ()
&& !is_convertible <B, array_view<A>> ()
&& !is_convertible <C, array_view<A>> ()
&& !is_convertible <A, array_view<B>> ()
&& is_convertible <B, array_view<B>> ()
&& !is_convertible <C, array_view<B>> ());
}
} /* namespace no_slicing */
static_assert (no_slicing::check (), "");
/* Check that array_view implicitly converts from std::vector. */
static constexpr bool
check_convertible_from_std_vector ()
{
using gdb::array_view;
using T = gdb_byte;
/* Note there's no such thing as std::vector<const T>. */
return (true
&& is_convertible <std::vector<T>, array_view<T>> ()
&& is_convertible <std::vector<T>, array_view<const T>> ());
}
static_assert (check_convertible_from_std_vector (), "");
/* Check that array_view implicitly converts from std::array. */
static constexpr bool
check_convertible_from_std_array ()
{
using gdb::array_view;
using T = gdb_byte;
/* Note: a non-const T view can't refer to a const T array. */
return (true
&& is_convertible <std::array<T, 1>, array_view<T>> ()
&& is_convertible <std::array<T, 1>, array_view<const T>> ()
&& !is_convertible <std::array<const T, 1>, array_view<T>> ()
&& is_convertible <std::array<const T, 1>, array_view<const T>> ());
}
static_assert (check_convertible_from_std_array (), "");
/* Check that VIEW views C (a container like std::vector/std::array)
correctly. */
template<typename View, typename Container>
static bool
check_container_view (const View &view, const Container &c)
{
if (view.empty ())
return false;
if (view.size () != c.size ())
return false;
if (view.data () != c.data ())
return false;
for (size_t i = 0; i < c.size (); i++)
{
if (&view[i] != &c[i])
return false;
if (view[i] != c[i])
return false;
}
return true;
}
/* Check that VIEW views E (an object of the type of a view element)
correctly. */
template<typename View, typename Elem>
static bool
check_elem_view (const View &view, const Elem &e)
{
if (view.empty ())
return false;
if (view.size () != 1)
return false;
if (view.data () != &e)
return false;
if (&view[0] != &e)
return false;
if (view[0] != e)
return false;
return true;
}
/* Check for operator[]. The first overload is taken iff
'view<T>()[0] = T()' is a valid expression. */
template<typename View,
typename = decltype (std::declval<View> ()[0]
= std::declval<typename View::value_type> ())>
static bool
check_op_subscript (const View &view)
{
return true;
}
/* This overload is taken iff 'view<T>()[0] = T()' is not a valid
expression. */
static bool
check_op_subscript (...)
{
return false;
}
/* Check construction with pointer + size. This is a template in
order to test both gdb_byte and const gdb_byte. */
template<typename T>
static void
check_ptr_size_ctor ()
{
T data[] = {0x11, 0x22, 0x33, 0x44};
gdb::array_view<T> view (data + 1, 2);
SELF_CHECK (!view.empty ());
SELF_CHECK (view.size () == 2);
SELF_CHECK (view.data () == &data[1]);
SELF_CHECK (view[0] == data[1]);
SELF_CHECK (view[1] == data[2]);
gdb::array_view<const T> cview (data + 1, 2);
SELF_CHECK (!cview.empty ());
SELF_CHECK (cview.size () == 2);
SELF_CHECK (cview.data () == &data[1]);
SELF_CHECK (cview[0] == data[1]);
SELF_CHECK (cview[1] == data[2]);
}
/* Asserts std::is_constructible. */
template<typename T, typename... Args>
static constexpr bool
require_not_constructible ()
{
static_assert (!std::is_constructible<T, Args...>::value, "");
/* constexpr functions can't return void in C++11 (N3444). */
return true;
};
/* Check the array_view<T>(PTR, SIZE) ctor, when T is a pointer. */
static void
check_ptr_size_ctor2 ()
{
struct A {};
A an_a;
A *array[] = { &an_a };
const A * const carray[] = { &an_a };
gdb::array_view<A *> v1 = {array, ARRAY_SIZE (array)};
gdb::array_view<A *> v2 = {array, (char) ARRAY_SIZE (array)};
gdb::array_view<A * const> v3 = {array, ARRAY_SIZE (array)};
gdb::array_view<const A * const> cv1 = {carray, ARRAY_SIZE (carray)};
require_not_constructible<gdb::array_view<A *>, decltype (carray), size_t> ();
SELF_CHECK (v1[0] == array[0]);
SELF_CHECK (v2[0] == array[0]);
SELF_CHECK (v3[0] == array[0]);
SELF_CHECK (!v1.empty ());
SELF_CHECK (v1.size () == 1);
SELF_CHECK (v1.data () == &array[0]);
SELF_CHECK (cv1[0] == carray[0]);
SELF_CHECK (!cv1.empty ());
SELF_CHECK (cv1.size () == 1);
SELF_CHECK (cv1.data () == &carray[0]);
}
/* Check construction with a pair of pointers. This is a template in
order to test both gdb_byte and const gdb_byte. */
template<typename T>
static void
check_ptr_ptr_ctor ()
{
T data[] = {0x11, 0x22, 0x33, 0x44};
gdb::array_view<T> view (data + 1, data + 3);
SELF_CHECK (!view.empty ());
SELF_CHECK (view.size () == 2);
SELF_CHECK (view.data () == &data[1]);
SELF_CHECK (view[0] == data[1]);
SELF_CHECK (view[1] == data[2]);
gdb_byte array[] = {0x11, 0x22, 0x33, 0x44};
const gdb_byte *p1 = array;
gdb_byte *p2 = array + ARRAY_SIZE (array);
gdb::array_view<const gdb_byte> view2 (p1, p2);
}
/* Check construction with a pair of pointers of mixed constness. */
static void
check_ptr_ptr_mixed_cv ()
{
gdb_byte array[] = {0x11, 0x22, 0x33, 0x44};
const gdb_byte *cp = array;
gdb_byte *p = array;
gdb::array_view<const gdb_byte> view1 (cp, p);
gdb::array_view<const gdb_byte> view2 (p, cp);
SELF_CHECK (view1.empty ());
SELF_CHECK (view2.empty ());
}
/* Check range-for support (i.e., begin()/end()). This is a template
in order to test both gdb_byte and const gdb_byte. */
template<typename T>
static void
check_range_for ()
{
T data[] = {1, 2, 3, 4};
gdb::array_view<T> view (data);
typename std::decay<T>::type sum = 0;
for (auto &elem : view)
sum += elem;
SELF_CHECK (sum == 1 + 2 + 3 + 4);
}
/* Entry point. */
static void
run_tests ()
{
/* Empty views. */
{
constexpr gdb::array_view<gdb_byte> view1;
constexpr gdb::array_view<const gdb_byte> view2;
static_assert (view1.empty (), "");
static_assert (view1.data () == nullptr, "");
static_assert (view1.size () == 0, "");
static_assert (view2.empty (), "");
static_assert (view2.size () == 0, "");
static_assert (view2.data () == nullptr, "");
}
std::vector<gdb_byte> vec = {0x11, 0x22, 0x33, 0x44 };
std::array<gdb_byte, 4> array = {{0x11, 0x22, 0x33, 0x44}};
/* Various tests of views over std::vector. */
{
gdb::array_view<gdb_byte> view = vec;
SELF_CHECK (check_container_view (view, vec));
gdb::array_view<const gdb_byte> cview = vec;
SELF_CHECK (check_container_view (cview, vec));
}
/* Likewise, over std::array. */
{
gdb::array_view<gdb_byte> view = array;
SELF_CHECK (check_container_view (view, array));
gdb::array_view<gdb_byte> cview = array;
SELF_CHECK (check_container_view (cview, array));
}
/* op=(std::vector/std::array/elem) */
{
gdb::array_view<gdb_byte> view;
view = vec;
SELF_CHECK (check_container_view (view, vec));
view = std::move (vec);
SELF_CHECK (check_container_view (view, vec));
view = array;
SELF_CHECK (check_container_view (view, array));
view = std::move (array);
SELF_CHECK (check_container_view (view, array));
gdb_byte elem = 0;
view = elem;
SELF_CHECK (check_elem_view (view, elem));
view = std::move (elem);
SELF_CHECK (check_elem_view (view, elem));
}
/* Test copy/move ctor and mutable->immutable conversion. */
{
gdb_byte data[] = {0x11, 0x22, 0x33, 0x44};
gdb::array_view<gdb_byte> view1 = data;
gdb::array_view<gdb_byte> view2 = view1;
gdb::array_view<gdb_byte> view3 = std::move (view1);
gdb::array_view<const gdb_byte> cview1 = data;
gdb::array_view<const gdb_byte> cview2 = cview1;
gdb::array_view<const gdb_byte> cview3 = std::move (cview1);
SELF_CHECK (view1[0] == data[0]);
SELF_CHECK (view2[0] == data[0]);
SELF_CHECK (view3[0] == data[0]);
SELF_CHECK (cview1[0] == data[0]);
SELF_CHECK (cview2[0] == data[0]);
SELF_CHECK (cview3[0] == data[0]);
}
/* Same, but op=(view). */
{
gdb_byte data[] = {0x55, 0x66, 0x77, 0x88};
gdb::array_view<gdb_byte> view1;
gdb::array_view<gdb_byte> view2;
gdb::array_view<gdb_byte> view3;
gdb::array_view<const gdb_byte> cview1;
gdb::array_view<const gdb_byte> cview2;
gdb::array_view<const gdb_byte> cview3;
view1 = data;
view2 = view1;
view3 = std::move (view1);
cview1 = data;
cview2 = cview1;
cview3 = std::move (cview1);
SELF_CHECK (view1[0] == data[0]);
SELF_CHECK (view2[0] == data[0]);
SELF_CHECK (view3[0] == data[0]);
SELF_CHECK (cview1[0] == data[0]);
SELF_CHECK (cview2[0] == data[0]);
SELF_CHECK (cview3[0] == data[0]);
}
/* op[] */
{
std::vector<gdb_byte> vec2 = {0x11, 0x22};
gdb::array_view<gdb_byte> view = vec2;
gdb::array_view<const gdb_byte> cview = vec2;
/* Check that op[] on a non-const view of non-const T returns a
mutable reference. */
view[0] = 0x33;
SELF_CHECK (vec2[0] == 0x33);
/* OTOH, check that assigning through op[] on a view of const T
wouldn't compile. */
SELF_CHECK (!check_op_subscript (cview));
/* For completeness. */
SELF_CHECK (check_op_subscript (view));
}
check_ptr_size_ctor<const gdb_byte> ();
check_ptr_size_ctor<gdb_byte> ();
check_ptr_size_ctor2 ();
check_ptr_ptr_ctor<const gdb_byte> ();
check_ptr_ptr_ctor<gdb_byte> ();
check_ptr_ptr_mixed_cv ();
check_range_for<gdb_byte> ();
check_range_for<const gdb_byte> ();
/* Check that the right ctor overloads are taken when the element is
a container. */
{
using Vec = std::vector<gdb_byte>;
Vec vecs[3];
gdb::array_view<Vec> view_array = vecs;
SELF_CHECK (view_array.size () == 3);
Vec elem;
gdb::array_view<Vec> view_elem = elem;
SELF_CHECK (view_elem.size () == 1);
}
/* gdb::make_array_view, int length. */
{
gdb_byte data[] = {0x55, 0x66, 0x77, 0x88};
int len = sizeof (data) / sizeof (data[0]);
auto view = gdb::make_array_view (data, len);
SELF_CHECK (view.data () == data);
SELF_CHECK (view.size () == len);
for (size_t i = 0; i < len; i++)
SELF_CHECK (view[i] == data[i]);
}
/* Test slicing. */
{
gdb_byte data[] = {0x55, 0x66, 0x77, 0x88, 0x99};
gdb::array_view<gdb_byte> view = data;
{
auto slc = view.slice (1, 3);
SELF_CHECK (slc.data () == data + 1);
SELF_CHECK (slc.size () == 3);
SELF_CHECK (slc[0] == data[1]);
SELF_CHECK (slc[0] == view[1]);
}
{
auto slc = view.slice (2);
SELF_CHECK (slc.data () == data + 2);
SELF_CHECK (slc.size () == 3);
SELF_CHECK (slc[0] == view[2]);
SELF_CHECK (slc[0] == data[2]);
}
}
}
} /* namespace array_view_tests */
} /* namespace selftests */
void _initialize_array_view_selftests ();
void
_initialize_array_view_selftests ()
{
selftests::register_test ("array_view",
selftests::array_view_tests::run_tests);
}
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