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llvm-project/clang/test/Lexer/cxx-features.cpp
Alan Zhao 95a4c0c835 [clang] Reland parenthesized aggregate init patches 
This commit relands the patches for implementing P0960R3 and P1975R0,
which describe initializing aggregates via a parenthesized list.

The relanded commits are:

* 40c52159d3ee - P0960R3 and P1975R0: Allow initializing aggregates from
  a parenthesized list of values
* c77a91bb7ba7 - Remove overly restrictive aggregate paren init logic
* 32d7aae04fdb - Fix a clang crash on invalid code in C++20 mode

This patch also fixes a crash in the original implementation.
Previously, if the input tried to call an implicitly deleted copy or
move constructor of a union, we would then try to initialize the union
by initializing it's first element with a reference to a union. This
behavior is incorrect (we should fail to initialize) and if the type of
the first element has a constructor with a single template typename
parameter, then Clang will explode. This patch fixes that issue by
checking that constructor overload resolution did not result in a
deleted function before attempting parenthesized aggregate
initialization.

Additionally, this patch also includes D140159, which contains some
minor fixes made in response to code review comments in the original
implementation that were made after that patch was submitted.

Co-authored-by: Sheng <ox59616e@gmail.com>

Fixes #54040, Fixes #59675

Reviewed By: ilya-biryukov

Differential Revision: https://reviews.llvm.org/D141546
2023-01-12 09:58:15 -08:00

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// RUN: %clang_cc1 -std=c++98 -fcxx-exceptions -verify %s
// RUN: %clang_cc1 -std=c++11 -fcxx-exceptions -verify %s
// RUN: %clang_cc1 -std=c++14 -fcxx-exceptions -fsized-deallocation -verify %s
// RUN: %clang_cc1 -std=c++17 -fcxx-exceptions -fsized-deallocation -verify %s
// RUN: %clang_cc1 -std=c++20 -fcxx-exceptions -fsized-deallocation -verify %s
// RUN: %clang_cc1 -std=c++2b -fcxx-exceptions -fsized-deallocation -verify %s
//
// RUN: %clang_cc1 -std=c++17 -fcxx-exceptions -fsized-deallocation -frelaxed-template-template-args -DRELAXED_TEMPLATE_TEMPLATE_ARGS=1 -verify %s
// RUN: %clang_cc1 -std=c++17 -fcxx-exceptions -fsized-deallocation -DCONCEPTS_TS=1 -verify %s
// RUN: %clang_cc1 -std=c++14 -fno-rtti -fno-threadsafe-statics -verify %s -DNO_EXCEPTIONS -DNO_RTTI -DNO_THREADSAFE_STATICS -fsized-deallocation
// RUN: %clang_cc1 -std=c++14 -fcoroutines-ts -DNO_EXCEPTIONS -DCOROUTINES -verify -fsized-deallocation %s
// RUN: %clang_cc1 -std=c++14 -fchar8_t -DNO_EXCEPTIONS -DCHAR8_T -verify -fsized-deallocation %s
// RUN: %clang_cc1 -std=c++2a -fno-char8_t -DNO_EXCEPTIONS -DNO_CHAR8_T -verify -fsized-deallocation %s
// expected-no-diagnostics
// FIXME using `defined` in a macro has undefined behavior.
#if __cplusplus < 201103L
#define check(macro, cxx98, cxx11, cxx14, cxx17, cxx20, cxx23) (cxx98 == 0 ? defined(__cpp_##macro) : __cpp_##macro != cxx98)
#elif __cplusplus < 201402L
#define check(macro, cxx98, cxx11, cxx14, cxx17, cxx20, cxx23) (cxx11 == 0 ? defined(__cpp_##macro) : __cpp_##macro != cxx11)
#elif __cplusplus < 201703L
#define check(macro, cxx98, cxx11, cxx14, cxx17, cxx20, cxx23) (cxx14 == 0 ? defined(__cpp_##macro) : __cpp_##macro != cxx14)
#elif __cplusplus < 202002L
#define check(macro, cxx98, cxx11, cxx14, cxx17, cxx20, cxx23) (cxx17 == 0 ? defined(__cpp_##macro) : __cpp_##macro != cxx17)
#elif __cplusplus == 202002L
#define check(macro, cxx98, cxx11, cxx14, cxx17, cxx20, cxx23) (cxx20 == 0 ? defined(__cpp_##macro) : __cpp_##macro != cxx20)
#else
#define check(macro, cxx98, cxx11, cxx14, cxx17, cxx20, cxx23) (cxx23 == 0 ? defined(__cpp_##macro) : __cpp_##macro != cxx23)
#endif
// --- C++2b features ---
#if check(implicit_move, 0, 0, 0, 0, 0, 202011)
#error "wrong value for __cpp_implicit_move"
#endif
#if check(size_t_suffix, 0, 0, 0, 0, 0, 202011)
#error "wrong value for __cpp_size_t_suffix"
#endif
#if check(if_consteval, 0, 0, 0, 0, 0, 202106)
#error "wrong value for __cpp_if_consteval"
#endif
#if check(multidimensional_subscript, 0, 0, 0, 0, 0, 202211)
#error "wrong value for __cpp_multidimensional_subscript"
#endif
#if check(static_call_operator, 0, 202207, 202207, 202207, 202207, 202207)
#error "wrong value for __cpp_static_call_operator"
#endif
#if check(named_character_escapes, 202207, 202207, 202207, 202207, 202207, 202207)
#error "wrong value for __cpp_named_character_escapes"
#endif
#if check(explicit_this_parameter, 0, 0, 0, 0, 0, 0)
#error "wrong value for __cpp_explicit_this_parameter"
#endif
// --- C++20 features ---
#if check(aggregate_paren_init, 0, 0, 0, 0, 201902, 201902)
#error "wrong value for __cpp_aggregate_paren_init"
#endif
#if defined(CHAR8_T) ? check(char8_t, 202207, 202207, 202207, 202207, 202207, 202207) : \
defined(NO_CHAR8_T) ? check(char8_t, 0, 0, 0, 0, 0, 0) : \
check(char8_t, 0, 0, 0, 0, 202207, 202207)
#error "wrong value for __cpp_char8_t"
#endif
#if check(concepts, 0, 0, 0, 0, 201907, 201907)
#error "wrong value for __cpp_concepts"
#endif
#if check(conditional_explicit, 0, 0, 0, 0, 201806, 201806)
#error "wrong value for __cpp_conditional_explicit"
#endif
#if check(consteval, 0, 0, 0, 0, 0, 0)
// FIXME: 201811 in C++20
#error "wrong value for __cpp_consteval"
#endif
// constexpr checked below
#if check(constexpr_dynamic_alloc, 0, 0, 0, 0, 201907, 201907)
#error "wrong value for __cpp_constexpr_dynamic_alloc"
#endif
#if check(constexpr_in_decltype, 0, 201711, 201711, 201711, 201711, 201711)
#error "wrong value for __cpp_constexpr_in_decltype"
#endif
#if check(constinit, 0, 0, 0, 0, 201907, 201907)
#error "wrong value for __cpp_constinit"
#endif
// deduction_guides checked below
#if check(designated_initializers, 0, 0, 0, 0, 201707, 201707)
#error "wrong value for __cpp_designated_initializers"
#endif
// generic_lambdas checked below
#if check(impl_destroying_delete, 201806, 201806, 201806, 201806, 201806, 201806)
#error "wrong value for __cpp_impl_destroying_delete"
#endif
#if check(impl_three_way_comparison, 0, 0, 0, 0, 201907, 201907)
#error "wrong value for __cpp_impl_three_way_comparison"
#endif
#if check(impl_coroutine, 0, 0, 0, 0, 201902L, 201902L)
#error "wrong value for __cpp_impl_coroutine"
#endif
// init_captures checked below
#if check(modules, 0, 0, 0, 0, 0, 0)
// FIXME: 201907 in C++20
#error "wrong value for __cpp_modules"
#endif
#if check(using_enum, 0, 0, 0, 0, 201907, 201907)
#error "wrong value for __cpp_using_enum"
#endif
// --- C++17 features ---
#if check(hex_float, 0, 0, 0, 201603, 201603, 201603)
#error "wrong value for __cpp_hex_float"
#endif
#if check(inline_variables, 0, 0, 0, 201606, 201606, 201606)
#error "wrong value for __cpp_inline_variables"
#endif
#if check(aligned_new, 0, 0, 0, 201606, 201606, 201606)
#error "wrong value for __cpp_aligned_new"
#endif
#if check(guaranteed_copy_elision, 0, 0, 0, 201606, 201606, 201606)
#error "wrong value for __cpp_guaranteed_copy_elision"
#endif
#if check(noexcept_function_type, 0, 0, 0, 201510, 201510, 201510)
#error "wrong value for __cpp_noexcept_function_type"
#endif
#if check(fold_expressions, 0, 0, 0, 201603, 201603, 201603)
#error "wrong value for __cpp_fold_expressions"
#endif
#if check(capture_star_this, 0, 0, 0, 201603, 201603, 201603)
#error "wrong value for __cpp_capture_star_this"
#endif
// constexpr checked below
#if check(if_constexpr, 0, 0, 0, 201606, 201606, 201606)
#error "wrong value for __cpp_if_constexpr"
#endif
// range_based_for checked below
// static_assert checked below
#if check(deduction_guides, 0, 0, 0, 201703, 201703, 201703)
// FIXME: 201907 in C++20
#error "wrong value for __cpp_deduction_guides"
#endif
#if check(nontype_template_parameter_auto, 0, 0, 0, 201606, 201606, 201606)
#error "wrong value for __cpp_nontype_template_parameter_auto"
#endif
// This is the old name (from P0096R4) for
// __cpp_nontype_template_parameter_auto
#if check(template_auto, 0, 0, 0, 201606, 201606, 201606)
#error "wrong value for __cpp_template_auto"
#endif
#if check(namespace_attributes, 0, 0, 0, 201411, 201411, 201411)
// FIXME: allowed without warning in C++14 and C++11
#error "wrong value for __cpp_namespace_attributes"
#endif
#if check(enumerator_attributes, 0, 0, 0, 201411, 201411, 201411)
// FIXME: allowed without warning in C++14 and C++11
#error "wrong value for __cpp_enumerator_attributes"
#endif
// This is an old name (from P0096R4), now removed from SD-6.
#if check(nested_namespace_definitions, 0, 0, 0, 201411, 201411, 201411)
#error "wrong value for __cpp_nested_namespace_definitions"
#endif
// inheriting_constructors checked below
#if check(variadic_using, 0, 0, 0, 201611, 201611, 201611)
#error "wrong value for __cpp_variadic_using"
#endif
#if check(aggregate_bases, 0, 0, 0, 201603, 201603, 201603)
#error "wrong value for __cpp_aggregate_bases"
#endif
#if check(structured_bindings, 0, 0, 0, 201606, 201606, 201606)
#error "wrong value for __cpp_structured_bindings"
#endif
#if check(nontype_template_args, 0, 0, 0, 201411, 201411, 201411)
// FIXME: 201911 in C++20
#error "wrong value for __cpp_nontype_template_args"
#endif
#if defined(RELAXED_TEMPLATE_TEMPLATE_ARGS) \
? check(template_template_args, 0, 0, 0, 201611, 201611, 201611) \
: check(template_template_args, 0, 0, 0, 0, 0, 0)
#error "wrong value for __cpp_template_template_args"
#endif
// --- C++14 features ---
#if check(binary_literals, 0, 0, 201304, 201304, 201304, 201304)
#error "wrong value for __cpp_binary_literals"
#endif
// (Removed from SD-6.)
#if check(digit_separators, 0, 0, 201309, 201309, 201309, 201309)
#error "wrong value for __cpp_digit_separators"
#endif
#if check(init_captures, 0, 0, 201304, 201304, 201803, 201803)
#error "wrong value for __cpp_init_captures"
#endif
#if check(generic_lambdas, 0, 0, 201304, 201304, 201707, 201707)
#error "wrong value for __cpp_generic_lambdas"
#endif
#if check(sized_deallocation, 0, 0, 201309, 201309, 201309, 201309)
#error "wrong value for __cpp_sized_deallocation"
#endif
// constexpr checked below
#if check(decltype_auto, 0, 0, 201304, 201304, 201304, 201304)
#error "wrong value for __cpp_decltype_auto"
#endif
#if check(return_type_deduction, 0, 0, 201304, 201304, 201304, 201304)
#error "wrong value for __cpp_return_type_deduction"
#endif
#if check(runtime_arrays, 0, 0, 0, 0, 0, 0)
#error "wrong value for __cpp_runtime_arrays"
#endif
#if check(aggregate_nsdmi, 0, 0, 201304, 201304, 201304, 201304)
#error "wrong value for __cpp_aggregate_nsdmi"
#endif
#if check(variable_templates, 0, 0, 201304, 201304, 201304, 201304)
#error "wrong value for __cpp_variable_templates"
#endif
// --- C++11 features ---
#if check(unicode_characters, 0, 200704, 200704, 200704, 200704, 200704)
#error "wrong value for __cpp_unicode_characters"
#endif
#if check(raw_strings, 0, 200710, 200710, 200710, 200710, 200710)
#error "wrong value for __cpp_raw_strings"
#endif
#if check(unicode_literals, 0, 200710, 200710, 200710, 200710, 200710)
#error "wrong value for __cpp_unicode_literals"
#endif
#if check(user_defined_literals, 0, 200809, 200809, 200809, 200809, 200809)
#error "wrong value for __cpp_user_defined_literals"
#endif
#if defined(NO_THREADSAFE_STATICS) ? check(threadsafe_static_init, 0, 0, 0, 0, 0, 0) : \
check(threadsafe_static_init, 200806, 200806, 200806, 200806, 200806, 200806)
#error "wrong value for __cpp_threadsafe_static_init"
#endif
#if check(lambdas, 0, 200907, 200907, 200907, 200907, 200907)
#error "wrong value for __cpp_lambdas"
#endif
#if check(constexpr, 0, 200704, 201304, 201603, 201907, 202211)
#error "wrong value for __cpp_constexpr"
#endif
#if check(range_based_for, 0, 200907, 200907, 201603, 201603, 201603)
#error "wrong value for __cpp_range_based_for"
#endif
#if check(static_assert, 0, 200410, 200410, 201411, 201411, 201411)
#error "wrong value for __cpp_static_assert"
#endif
#if check(decltype, 0, 200707, 200707, 200707, 200707, 200707)
#error "wrong value for __cpp_decltype"
#endif
#if check(attributes, 0, 200809, 200809, 200809, 200809, 200809)
#error "wrong value for __cpp_attributes"
#endif
#if check(rvalue_references, 0, 200610, 200610, 200610, 200610, 200610)
#error "wrong value for __cpp_rvalue_references"
#endif
#if check(variadic_templates, 0, 200704, 200704, 200704, 200704, 200704)
#error "wrong value for __cpp_variadic_templates"
#endif
#if check(initializer_lists, 0, 200806, 200806, 200806, 200806, 200806)
#error "wrong value for __cpp_initializer_lists"
#endif
#if check(delegating_constructors, 0, 200604, 200604, 200604, 200604, 200604)
#error "wrong value for __cpp_delegating_constructors"
#endif
#if check(nsdmi, 0, 200809, 200809, 200809, 200809, 200809)
#error "wrong value for __cpp_nsdmi"
#endif
#if check(inheriting_constructors, 0, 201511, 201511, 201511, 201511, 201511)
#error "wrong value for __cpp_inheriting_constructors"
#endif
#if check(ref_qualifiers, 0, 200710, 200710, 200710, 200710, 200710)
#error "wrong value for __cpp_ref_qualifiers"
#endif
#if check(alias_templates, 0, 200704, 200704, 200704, 200704, 200704)
#error "wrong value for __cpp_alias_templates"
#endif
// --- C++98 features ---
#if defined(NO_RTTI) ? check(rtti, 0, 0, 0, 0, 0, 0) : check(rtti, 199711, 199711, 199711, 199711, 199711, 199711)
#error "wrong value for __cpp_rtti"
#endif
#if defined(NO_EXCEPTIONS) ? check(exceptions, 0, 0, 0, 0, 0, 0) : check(exceptions, 199711, 199711, 199711, 199711, 199711, 199711)
#error "wrong value for __cpp_exceptions"
#endif
// --- TS features --
#if defined(COROUTINES) ? check(coroutines, 201703, 201703, 201703, 201703, 201703, 201703) : check(coroutines, 0, 0, 0, 0, 201703, 201703)
#error "wrong value for __cpp_coroutines"
#endif
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