[libc++][TZDB] Implements time_zone::to_sys. #90394
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@llvm/pr-subscribers-libcxx Author: Mark de Wever (mordante) ChangesThis implements the throwing overload and the exception classes throw by this overload. Implements parts of:
Patch is 44.82 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/90394.diff 16 Files Affected:
diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
index 1296c536bc882c..386bd967eed7ab 100644
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -264,6 +264,7 @@ set(files
__chrono/convert_to_tm.h
__chrono/day.h
__chrono/duration.h
+ __chrono/exception.h
__chrono/file_clock.h
__chrono/formatter.h
__chrono/hh_mm_ss.h
diff --git a/libcxx/include/__chrono/exception.h b/libcxx/include/__chrono/exception.h
new file mode 100644
index 00000000000000..ca0acecf151ba9
--- /dev/null
+++ b/libcxx/include/__chrono/exception.h
@@ -0,0 +1,128 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
+
+#ifndef _LIBCPP___CHRONO_EXCEPTION_H
+#define _LIBCPP___CHRONO_EXCEPTION_H
+
+#include <version>
+// Enable the contents of the header only when libc++ was built with experimental features enabled.
+#if !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
+
+# include <__availability>
+# include <__chrono/calendar.h>
+# include <__chrono/local_info.h>
+# include <__config>
+# include <__verbose_abort>
+# include <format>
+# include <stdexcept>
+# include <string>
+
+# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+# endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+# if _LIBCPP_STD_VER >= 20
+
+namespace chrono {
+
+class nonexistent_local_time : public runtime_error {
+public:
+ template <class _Duration>
+ _LIBCPP_HIDE_FROM_ABI nonexistent_local_time(const local_time<_Duration>& __time, const local_info& __info)
+ : runtime_error{__create_message(__time, __info)} {
+ // [time.zone.exception.nonexist]/2
+ // Preconditions: i.result == local_info::nonexistent is true.
+ // The value of __info.result is not used.
+ _LIBCPP_ASSERT_PEDANTIC(__info.result == local_info::nonexistent,
+ "creating an nonexistent_local_time from a local_info that is not non-existent");
+ }
+
+ _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI ~nonexistent_local_time() override; // exported as key function
+
+private:
+ template <class _Duration>
+ _LIBCPP_HIDE_FROM_ABI string __create_message(const local_time<_Duration>& __time, const local_info& __info) {
+ return std::format(
+ R"({} is in a gap between
+{} {} and
+{} {} which are both equivalent to
+{} UTC)",
+ __time,
+ local_seconds{__info.first.end.time_since_epoch()} + __info.first.offset,
+ __info.first.abbrev,
+ local_seconds{__info.second.begin.time_since_epoch()} + __info.second.offset,
+ __info.second.abbrev,
+ __info.first.end);
+ }
+};
+
+template <class _Duration>
+_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_nonexistent_local_time(
+ [[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
+# ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+ throw nonexistent_local_time(__time, __info);
+# else
+ _LIBCPP_VERBOSE_ABORT("nonexistent_local_time was thrown in -fno-exceptions mode");
+# endif
+}
+
+class ambiguous_local_time : public runtime_error {
+public:
+ template <class _Duration>
+ _LIBCPP_HIDE_FROM_ABI ambiguous_local_time(const local_time<_Duration>& __time, const local_info& __info)
+ : runtime_error{__create_message(__time, __info)} {
+ // [time.zone.exception.ambig]/2
+ // Preconditions: i.result == local_info::ambiguous is true.
+ // The value of __info.result is not used.
+ _LIBCPP_ASSERT_PEDANTIC(__info.result == local_info::ambiguous,
+ "creating an ambiguous_local_time from a local_info that is not ambiguous");
+ }
+
+ _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI ~ambiguous_local_time() override; // exported as key function
+
+private:
+ template <class _Duration>
+ _LIBCPP_HIDE_FROM_ABI string __create_message(const local_time<_Duration>& __time, const local_info& __info) {
+ return std::format(
+ // There are two spaces after the full-stop; this has been verified
+ // in the sources of the Standard.
+ R"({0} is ambiguous. It could be
+{0} {1} == {2} UTC or
+{0} {3} == {4} UTC)",
+ __time,
+ __info.first.abbrev,
+ __time - __info.first.offset,
+ __info.second.abbrev,
+ __time - __info.second.offset);
+ }
+};
+
+template <class _Duration>
+_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void __throw_ambiguous_local_time(
+ [[maybe_unused]] const local_time<_Duration>& __time, [[maybe_unused]] const local_info& __info) {
+# ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+ throw ambiguous_local_time(__time, __info);
+# else
+ _LIBCPP_VERBOSE_ABORT("ambiguous_local_time was thrown in -fno-exceptions mode");
+# endif
+}
+
+} // namespace chrono
+
+# endif // _LIBCPP_STD_VER >= 20
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_TZDB)
+
+#endif // _LIBCPP___CHRONO_EXCEPTION_H
diff --git a/libcxx/include/__chrono/time_zone.h b/libcxx/include/__chrono/time_zone.h
index e28c9189c381b4..fbeed6103c49b3 100644
--- a/libcxx/include/__chrono/time_zone.h
+++ b/libcxx/include/__chrono/time_zone.h
@@ -18,6 +18,7 @@
# include <__chrono/calendar.h>
# include <__chrono/duration.h>
+# include <__chrono/exception.h>
# include <__chrono/local_info.h>
# include <__chrono/sys_info.h>
# include <__chrono/system_clock.h>
@@ -70,6 +71,30 @@ class _LIBCPP_AVAILABILITY_TZDB time_zone {
return __get_info(chrono::time_point_cast<seconds>(__time));
}
+ // Since the interface promisses throwing, don't add nodiscard.
+ template <class _Duration>
+ _LIBCPP_HIDE_FROM_ABI sys_time<common_type_t<_Duration, seconds>> to_sys(const local_time<_Duration>& __time) const {
+ local_info __info = get_info(__time);
+ switch (__info.result) {
+ case local_info::unique:
+ return sys_time<common_type_t<_Duration, seconds>>{__time.time_since_epoch() - __info.first.offset};
+
+ case local_info::nonexistent:
+ chrono::__throw_nonexistent_local_time(__time, __info);
+
+ case local_info::ambiguous:
+ chrono::__throw_ambiguous_local_time(__time, __info);
+ }
+
+ // TODO TZDB The Standard does not specify anything in these cases.
+ _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+ __info.result != -1, "cannot convert the local time; it would be before the minimum system clock value");
+ _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
+ __info.result != -2, "cannot convert the local time; it would be after the maximum system clock value");
+
+ return {};
+ }
+
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI const __impl& __implementation() const noexcept { return *__impl_; }
private:
diff --git a/libcxx/include/chrono b/libcxx/include/chrono
index 4d8398af1a108f..4b0ea938710bdd 100644
--- a/libcxx/include/chrono
+++ b/libcxx/include/chrono
@@ -724,6 +724,10 @@ const time_zone* current_zone()
const tzdb& reload_tzdb(); // C++20
string remote_version(); // C++20
+// [time.zone.exception], exception classes
+class nonexistent_local_time; // C++20
+class ambiguous_local_time; // C++20
+
// [time.zone.info], information classes
struct sys_info { // C++20
sys_seconds begin;
@@ -766,6 +770,10 @@ class time_zone {
template<class Duration>
local_info get_info(const local_time<Duration>& tp) const;
+
+ template<class Duration>
+ sys_time<common_type_t<Duration, seconds>>
+ to_sys(const local_time<Duration>& tp) const;
};
bool operator==(const time_zone& x, const time_zone& y) noexcept; // C++20
strong_ordering operator<=>(const time_zone& x, const time_zone& y) noexcept; // C++20
@@ -916,6 +924,7 @@ constexpr chrono::year operator ""y(unsigned lo
# include <__chrono/calendar.h>
# include <__chrono/day.h>
# include <__chrono/hh_mm_ss.h>
+# include <__chrono/exception.h>
# include <__chrono/literals.h>
# include <__chrono/local_info.h>
# include <__chrono/month.h>
diff --git a/libcxx/include/module.modulemap b/libcxx/include/module.modulemap
index 8727ab88f16c0a..1f1005ed09b67c 100644
--- a/libcxx/include/module.modulemap
+++ b/libcxx/include/module.modulemap
@@ -1112,6 +1112,7 @@ module std_private_chrono_duration [system] {
header "__chrono/duration.h"
export std_private_type_traits_is_convertible
}
+module std_private_chrono_exception [system] { header "__chrono/exception.h" }
module std_private_chrono_file_clock [system] { header "__chrono/file_clock.h" }
module std_private_chrono_formatter [system] {
header "__chrono/formatter.h"
diff --git a/libcxx/modules/std/chrono.inc b/libcxx/modules/std/chrono.inc
index 1265e21dc54ef6..38e3c4184521b7 100644
--- a/libcxx/modules/std/chrono.inc
+++ b/libcxx/modules/std/chrono.inc
@@ -208,11 +208,9 @@ export namespace std {
using std::chrono::reload_tzdb;
using std::chrono::remote_version;
-# if 0
// [time.zone.exception], exception classes
using std::chrono::ambiguous_local_time;
using std::chrono::nonexistent_local_time;
-# endif // if 0
// [time.zone.info], information classes
using std::chrono::local_info;
diff --git a/libcxx/src/CMakeLists.txt b/libcxx/src/CMakeLists.txt
index 8b28d1b8918955..0a8e11767ec46a 100644
--- a/libcxx/src/CMakeLists.txt
+++ b/libcxx/src/CMakeLists.txt
@@ -339,6 +339,9 @@ if (LIBCXX_ENABLE_LOCALIZATION AND LIBCXX_ENABLE_FILESYSTEM AND LIBCXX_ENABLE_TI
include/tzdb/types_private.h
include/tzdb/tzdb_list_private.h
include/tzdb/tzdb_private.h
+ # TODO TZDB The exception could be moved in chrono once the TZDB library
+ # is no longer experimental.
+ chrono_exception.cpp
time_zone.cpp
tzdb.cpp
tzdb_list.cpp
diff --git a/libcxx/src/chrono_exception.cpp b/libcxx/src/chrono_exception.cpp
new file mode 100644
index 00000000000000..8aeafdeecd69b9
--- /dev/null
+++ b/libcxx/src/chrono_exception.cpp
@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include <chrono>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace chrono {
+
+_LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI nonexistent_local_time::~nonexistent_local_time() = default;
+_LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI ambiguous_local_time::~ambiguous_local_time() = default;
+
+} // namespace chrono
+
+_LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/test/libcxx/time/time.zone/time.zone.exception/time.zone.exception.ambig/assert.ctor.pass.cpp b/libcxx/test/libcxx/time/time.zone/time.zone.exception/time.zone.exception.ambig/assert.ctor.pass.cpp
new file mode 100644
index 00000000000000..73e6bf2846f0e0
--- /dev/null
+++ b/libcxx/test/libcxx/time/time.zone/time.zone.exception/time.zone.exception.ambig/assert.ctor.pass.cpp
@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// REQUIRES: has-unix-headers
+// REQUIRES: libcpp-hardening-mode={{extensive|debug}}
+// XFAIL: libcpp-hardening-mode=debug && availability-verbose_abort-missing
+
+// XFAIL: libcpp-has-no-experimental-tzdb
+
+// <chrono>
+
+// class ambiguous_local_time
+//
+// template<class Duration>
+// ambiguous_local_time(const local_time<Duration>& tp, const local_info& i);
+
+#include <chrono>
+
+#include "check_assertion.h"
+
+// [time.zone.exception.ambig]/2
+// Preconditions: i.result == local_info::ambiguous is true.
+int main(int, char**) {
+ TEST_LIBCPP_ASSERT_FAILURE(
+ (std::chrono::ambiguous_local_time{
+ std::chrono::local_seconds{},
+ std::chrono::local_info{-1, // this is not one of the "named" result values
+ std::chrono::sys_info{},
+ std::chrono::sys_info{}}}),
+ "creating an ambiguous_local_time from a local_info that is not ambiguous");
+
+ TEST_LIBCPP_ASSERT_FAILURE(
+ (std::chrono::ambiguous_local_time{
+ std::chrono::local_seconds{},
+ std::chrono::local_info{std::chrono::local_info::unique, std::chrono::sys_info{}, std::chrono::sys_info{}}}),
+ "creating an ambiguous_local_time from a local_info that is not ambiguous");
+
+ TEST_LIBCPP_ASSERT_FAILURE(
+ (std::chrono::ambiguous_local_time{
+ std::chrono::local_seconds{},
+ std::chrono::local_info{
+ std::chrono::local_info::nonexistent, std::chrono::sys_info{}, std::chrono::sys_info{}}}),
+ "creating an ambiguous_local_time from a local_info that is not ambiguous");
+
+ return 0;
+}
diff --git a/libcxx/test/libcxx/time/time.zone/time.zone.exception/time.zone.exception.nonexist/assert.ctor.pass.cpp b/libcxx/test/libcxx/time/time.zone/time.zone.exception/time.zone.exception.nonexist/assert.ctor.pass.cpp
new file mode 100644
index 00000000000000..fdd9f79958f980
--- /dev/null
+++ b/libcxx/test/libcxx/time/time.zone/time.zone.exception/time.zone.exception.nonexist/assert.ctor.pass.cpp
@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// REQUIRES: has-unix-headers
+// REQUIRES: libcpp-hardening-mode={{extensive|debug}}
+// XFAIL: libcpp-hardening-mode=debug && availability-verbose_abort-missing
+
+// XFAIL: libcpp-has-no-experimental-tzdb
+
+// <chrono>
+
+// class nonexistent_local_time
+//
+// template<class Duration>
+// nonexistent_local_time(const local_time<Duration>& tp, const local_info& i);
+
+#include <chrono>
+
+#include "check_assertion.h"
+
+// [time.zone.exception.nonexist]/2
+// Preconditions: i.result == local_info::nonexistent is true.
+int main(int, char**) {
+ TEST_LIBCPP_ASSERT_FAILURE(
+ (std::chrono::nonexistent_local_time{
+ std::chrono::local_seconds{},
+ std::chrono::local_info{-1, // this is not one of the "named" result values
+ std::chrono::sys_info{},
+ std::chrono::sys_info{}}}),
+ "creating an nonexistent_local_time from a local_info that is not non-existent");
+
+ TEST_LIBCPP_ASSERT_FAILURE(
+ (std::chrono::nonexistent_local_time{
+ std::chrono::local_seconds{},
+ std::chrono::local_info{std::chrono::local_info::unique, std::chrono::sys_info{}, std::chrono::sys_info{}}}),
+ "creating an nonexistent_local_time from a local_info that is not non-existent");
+
+ TEST_LIBCPP_ASSERT_FAILURE(
+ (std::chrono::nonexistent_local_time{
+ std::chrono::local_seconds{},
+ std::chrono::local_info{
+ std::chrono::local_info::ambiguous, std::chrono::sys_info{}, std::chrono::sys_info{}}}),
+ "creating an nonexistent_local_time from a local_info that is not non-existent");
+
+ return 0;
+}
diff --git a/libcxx/test/libcxx/time/time.zone/time.zone.timezone/time.zone.members/assert.to_sys.pass.cpp b/libcxx/test/libcxx/time/time.zone/time.zone.timezone/time.zone.members/assert.to_sys.pass.cpp
new file mode 100644
index 00000000000000..3a2ff00088676b
--- /dev/null
+++ b/libcxx/test/libcxx/time/time.zone/time.zone.timezone/time.zone.members/assert.to_sys.pass.cpp
@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// REQUIRES: has-unix-headers
+// REQUIRES: libcpp-hardening-mode={{extensive|debug}}
+// XFAIL: libcpp-hardening-mode=debug && availability-verbose_abort-missing
+
+// XFAIL: libcpp-has-no-experimental-tzdb
+
+// <chrono>
+
+// template <class _Duration>
+// sys_time<common_type_t<Duration, seconds>>
+// to_sys(const local_time<Duration>& tp) const;
+
+#include <chrono>
+
+#include "check_assertion.h"
+
+// Tests values that cannot be converted. To make sure the test is does not depend on changes
+// in the database it uses a time zone with a fixed offset.
+int main(int, char**) {
+ TEST_LIBCPP_ASSERT_FAILURE(std::chrono::locate_zone("Etc/GMT-1")->to_sys(std::chrono::local_seconds::min()),
+ "cannot convert the local time; it would be before the minimum system clock value");
+
+ // TODO TZDB look why std::chrono::local_seconds::max() fails
+ TEST_LIBCPP_ASSERT_FAILURE(
+ std::chrono::locate_zone("Etc/GMT+1")->to_sys(std::chrono::local_seconds::max() - std::chrono::seconds(1)),
+ "cannot convert the local time; it would be after the maximum system clock value");
+
+ return 0;
+}
diff --git a/libcxx/test/std/time/time.zone/time.zone.exception/time.zone.exception.ambig/ctor.pass.cpp b/libcxx/test/std/time/time.zone/time.zone.exception/time.zone.exception.ambig/ctor.pass.cpp
new file mode 100644
index 00000000000000..ae98cb2a17c183
--- /dev/null
+++ b/libcxx/test/std/time/time.zone/time.zone.exception/time.zone.exception.ambig/ctor.pass.cpp
@@ -0,0 +1,169 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// XFAIL: libcpp-has-no-experimental-tzdb
+
+// <chrono>
+
+// class ambiguous_local_time
+//
+// template<class Duration>
+// ambiguous_local_time(const local_time<Duration>& tp, const local_info& i);
+
+#include <chrono>
+#include <string_view>
+
+#include "assert_macros.h"
+#include "concat_macros.h"
+
+template <class Duration>
+static void
+test(const std::chrono::local_time<Duration>& tp, const std::chrono::local_info& i, std::string_view expected) {
+ std::chrono::ambiguous_local_time exception{tp, i};
+ std::string_view result = exception.what();
+ TEST_REQUIRE(result == expected,
+ TEST_WRITE_CONCATENATED("Expected output\n", expected, "\n\nActual output\n", result, '\n'));
+}
+
+// The constructor constructs the runtime_error base class with a specific
+// message. This implicitly tests what() too, since that is inherited from
+// runtime_error there is no separate test for what().
+int main(int, char**) {
+ using namespace std::literals::chrono_literals;
+
+ // There is no requirement on the ordering of PREV and NEXT so an "invalid"
+ // overlap is allowed. All tests with negative dates use the same order as
+ // positive tests.
+
+ test(std::chrono::local_time<std::chrono::nanoseconds>{-1ns},
+ std::chrono::local_info{
+ std::chrono::local_info::ambiguous,
+ std::chrono::sys_info{
+ ...
[truncated]
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This implements the throwing overload and the exception classes throw by this overload. Implements parts of: - P0355 Extending chrono to Calendars and Time Zones
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Hi, we started to see libcxx tests failures on our Windows x64 msvc bots when running tests for Link to the failed bot: https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci/clang-windows-x64/b8745567626897665713/overview Could you take a look please? |
|
@zeroomega Some tests contain the line I don't have access to a Windows system. Could you test whether adding that line to the tests solves the issue? |
I did some test. I added I am not sure why this issue only happens when running test on I don't think adding |
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This moves the files to libcxx/src/experimental/ as discussed in llvm#90394. Fixes: llvm#94902
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This moves the files to libcxx/src/experimental/ as discussed in llvm#90394. Fixes: llvm#94902
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This moves the files to libcxx/src/experimental/ as discussed in llvm#90394. Fixes: llvm#94902
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Sep 13, 2024
This reverts commit 77116bd.
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This implements the throwing overload and the exception classes throw by this overload.
Implements parts of: