Implement <filesystem>

This patch implements the <filesystem> header and uses that
to provide <experimental/filesystem>.

Unlike other standard headers, the symbols needed for <filesystem>
have not yet been placed in libc++.so. Instead they live in the
new libc++fs.a library. Users of filesystem are required to link this
library. (Also note that libc++experimental no longer contains the
definition of <experimental/filesystem>, which now requires linking libc++fs).

The reason for keeping <filesystem> out of the dylib for now is that
it's still somewhat experimental, and the possibility of requiring an
ABI breaking change is very real. In the future the symbols will likely
be moved into the dylib, or the dylib will be made to link libc++fs automagically).

Note that moving the symbols out of libc++experimental may break user builds
until they update to -lc++fs. This should be OK, because the experimental
library provides no stability guarantees. However, I plan on looking into
ways we can force libc++experimental to automagically link libc++fs.

In order to use a single implementation and set of tests for <filesystem>, it
has been placed in a special `__fs` namespace. This namespace is inline in
C++17 onward, but not before that. As such implementation is available
in C++11 onward, but no filesystem namespace is present "directly", and
as such name conflicts shouldn't occur in C++11 or C++14.

llvm-svn: 338093

7 files changed, 0 insertions, 328 deletions

diff --git a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/append_op.pass.cpp b/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/append_op.pass.cpp
deleted file mode 100644
index 3648da57af0..00000000000
--- a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/append_op.pass.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// <experimental/filesystem>
-
-// path operator/(path const&, path const&);
-
-#include "filesystem_include.hpp"
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-#include "filesystem_test_helper.hpp"
-
-
-// This is mainly tested via the member append functions.
-int main()
-{
-  using namespace fs;
-  path p1("abc");
-  path p2("def");
-  path p3 = p1 / p2;
-  assert(p3 == "abc/def");
-}
diff --git a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/comparison_ops_tested_elsewhere.pass.cpp b/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/comparison_ops_tested_elsewhere.pass.cpp
deleted file mode 100644
index 28867432c61..00000000000
--- a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/comparison_ops_tested_elsewhere.pass.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// The comparison operators are tested as part of [path.compare]
-// in class.path/path.members/path.compare.pass.cpp
-int main() {}
diff --git a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp b/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
deleted file mode 100644
index b03b8008b62..00000000000
--- a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/hash_value_tested_elswhere.pass.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// The "hash_value" function is tested as part of [path.compare]
-// in class.path/path.members/path.compare.pass.cpp
-int main() {}
diff --git a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.factory.pass.cpp b/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.factory.pass.cpp
deleted file mode 100644
index 5d9194b4e8b..00000000000
--- a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.factory.pass.cpp
+++ /dev/null
@@ -1,52 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// <experimental/filesystem>
-
-// template <class Source>
-//    path u8path(Source const&);
-// template <class InputIter>
-//   path u8path(InputIter, InputIter);
-
-#include "filesystem_include.hpp"
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-#include "count_new.hpp"
-#include "filesystem_test_helper.hpp"
-
-
-int main()
-{
-  using namespace fs;
-  const char* In1 = "abcd/efg";
-  const std::string In2(In1);
-  const auto In3 = In2.begin();
-  const auto In3End = In2.end();
-  {
-    path p = fs::u8path(In1);
-    assert(p == In1);
-  }
-  {
-    path p = fs::u8path(In2);
-    assert(p == In1);
-  }
-  {
-    path p = fs::u8path(In3);
-    assert(p == In1);
-  }
-  {
-    path p = fs::u8path(In3, In3End);
-    assert(p == In1);
-  }
-}
diff --git a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.io.pass.cpp b/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.io.pass.cpp
deleted file mode 100644
index 58e333aad6b..00000000000
--- a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.io.pass.cpp
+++ /dev/null
@@ -1,98 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// <experimental/filesystem>
-
-// class path
-
-// template <class charT, class traits>
-// basic_ostream<charT, traits>&
-// operator<<(basic_ostream<charT, traits>& os, const path& p);
-//
-// template <class charT, class traits>
-// basic_istream<charT, traits>&
-// operator>>(basic_istream<charT, traits>& is, path& p)
-//
-
-#include "filesystem_include.hpp"
-#include <type_traits>
-#include <sstream>
-#include <cassert>
-#include <iostream>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-#include "count_new.hpp"
-#include "filesystem_test_helper.hpp"
-
-MultiStringType InStr =  MKSTR("abcdefg/\"hijklmnop\"/qrstuvwxyz/123456789");
-MultiStringType OutStr = MKSTR("\"abcdefg/\\\"hijklmnop\\\"/qrstuvwxyz/123456789\"");
-
-
-
-template <class CharT>
-void doIOTest() {
-  using namespace fs;
-  using Ptr = const CharT*;
-  using StrStream = std::basic_stringstream<CharT>;
-  const Ptr E = OutStr;
-  const path p((const char*)InStr);
-  StrStream ss;
-  { // test output
-    auto& ret = (ss << p);
-    assert(ss.str() == E);
-    assert(&ret == &ss);
-  }
-  { // test input
-    path p_in;
-    auto& ret = ss >> p_in;
-    assert(p_in.native() == (const char*)InStr);
-    assert(&ret == &ss);
-  }
-}
-
-namespace impl {
-using namespace fs;
-
-template <class Stream, class Tp, class = decltype(std::declval<Stream&>() << std::declval<Tp&>())>
-std::true_type is_ostreamable_imp(int);
-
-template <class Stream, class Tp>
-std::false_type is_ostreamable_imp(long);
-
-template <class Stream, class Tp, class = decltype(std::declval<Stream&>() >> std::declval<Tp&>())>
-std::true_type is_istreamable_imp(int);
-
-template <class Stream, class Tp>
-std::false_type is_istreamable_imp(long);
-
-
-} // namespace impl
-
-template <class Stream, class Tp>
-struct is_ostreamable : decltype(impl::is_ostreamable_imp<Stream, Tp>(0)) {};
-template <class Stream, class Tp>
-struct is_istreamable : decltype(impl::is_istreamable_imp<Stream, Tp>(0)) {};
-
-void test_LWG2989() {
-  static_assert(!is_ostreamable<decltype(std::cout), std::wstring>::value, "");
-  static_assert(!is_ostreamable<decltype(std::wcout), std::string>::value, "");
-  static_assert(!is_istreamable<decltype(std::cin), std::wstring>::value, "");
-  static_assert(!is_istreamable<decltype(std::wcin), std::string>::value, "");
-}
-
-int main() {
-  doIOTest<char>();
-  doIOTest<wchar_t>();
-  //doIOTest<char16_t>();
-  //doIOTest<char32_t>();
-  test_LWG2989();
-}
diff --git a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.io.unicode_bug.pass.cpp b/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.io.unicode_bug.pass.cpp
deleted file mode 100644
index ff622532e8c..00000000000
--- a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/path.io.unicode_bug.pass.cpp
+++ /dev/null
@@ -1,69 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// <experimental/filesystem>
-
-// class path
-
-// template <class charT, class traits>
-// basic_ostream<charT, traits>&
-// operator<<(basic_ostream<charT, traits>& os, const path& p);
-//
-// template <class charT, class traits>
-// basic_istream<charT, traits>&
-// operator>>(basic_istream<charT, traits>& is, path& p)
-//
-
-// TODO(EricWF) This test fails because "std::quoted" fails to compile
-// for char16_t and char32_t types. Combine with path.io.pass.cpp when this
-// passes.
-// XFAIL: *
-
-#include "filesystem_include.hpp"
-#include <type_traits>
-#include <sstream>
-#include <cassert>
-
-#include "test_macros.h"
-#include "test_iterators.h"
-#include "count_new.hpp"
-#include "filesystem_test_helper.hpp"
-
-MultiStringType InStr =  MKSTR("abcdefg/\"hijklmnop\"/qrstuvwxyz/123456789");
-MultiStringType OutStr = MKSTR("\"abcdefg/\\\"hijklmnop\\\"/qrstuvwxyz/123456789\"");
-
-template <class CharT>
-void doIOTest() {
-  using namespace fs;
-  using Ptr = const CharT*;
-  using StrStream = std::basic_stringstream<CharT>;
-  const char* const InCStr = InStr;
-  const Ptr E = OutStr;
-  const path p((const char*)InStr);
-  StrStream ss;
-  { // test output
-    auto& ret = (ss << p);
-    assert(ss.str() == E);
-    assert(&ret == &ss);
-  }
-  { // test input
-    path p_in;
-    auto& ret = ss >> p_in;
-    assert(p_in.native() == (const char*)InStr);
-    assert(&ret == &ss);
-  }
-}
-
-
-int main() {
-  doIOTest<char16_t>();
-  doIOTest<char32_t>();
-}
diff --git a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/swap.pass.cpp b/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/swap.pass.cpp
deleted file mode 100644
index 4f7b93a05a9..00000000000
--- a/libcxx/test/std/experimental/filesystem/class.path/path.nonmember/swap.pass.cpp
+++ /dev/null
@@ -1,49 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: c++98, c++03
-
-// <experimental/filesystem>
-
-// void swap(path& lhs, path& rhs) noexcept;
-
-#include "filesystem_include.hpp"
-#include <type_traits>
-#include <cassert>
-
-#include "test_macros.h"
-#include "count_new.hpp"
-#include "filesystem_test_helper.hpp"
-
-
-// NOTE: this is tested in path.members/path.modifiers via the member swap.
-int main()
-{
-  using namespace fs;
-  const char* value1 = "foo/bar/baz";
-  const char* value2 = "_THIS_IS_LONG_THIS_IS_LONG_THIS_IS_LONG_THIS_IS_LONG_THIS_IS_LONG_THIS_IS_LONG_THIS_IS_LONG";
-  path p1(value1);
-  path p2(value2);
-  {
-    using namespace std; using namespace fs;
-    ASSERT_NOEXCEPT(swap(p1, p2));
-    ASSERT_SAME_TYPE(void, decltype(swap(p1, p2)));
-  }
-  {
-    DisableAllocationGuard g;
-    using namespace std;
-    using namespace fs;
-    swap(p1, p2);
-    assert(p1.native() == value2);
-    assert(p2.native() == value1);
-    swap(p1, p2);
-    assert(p1.native() == value1);
-    assert(p2.native() == value2);
-  }
-}