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b3e6ff3319
This commit introduces support for the MSVC-specific C++11-style attribute `[[msvc::constexpr]]`, which was introduced in MSVC 14.33. The semantics of this attribute are enabled only under MSVC compatibility (`-fms-compatibility-version`) 14.33 and higher. Additionally, the default value of `_MSC_VER` has been raised to 1433. The current implementation lacks support for: - `[[msvc::constexpr]]` constructors (see #72149); at the time of this implementation, such support would have required an unreasonable number of changes in Clang. - `[[msvc::constexpr]] return ::new` (constexpr placement new) from non-std namespaces (see #74924). Relevant to: #57696
53 lines
3.8 KiB
C++
53 lines
3.8 KiB
C++
// RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.33 -std=c++20 -verify %s
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// RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.33 -std=c++17 -verify %s
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// Check explicitly invalid code
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void runtime() {} // expected-note {{declared here}}
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[[msvc::constexpr]] void f0() { runtime(); } // expected-error {{constexpr function never produces a constant expression}} \
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// expected-note {{non-constexpr function 'runtime' cannot be used in a constant expression}}
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[[msvc::constexpr]] constexpr void f1() {} // expected-error {{attribute 'msvc::constexpr' cannot be applied to the constexpr function 'f1'}}
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#if __cplusplus >= 202202L
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[[msvc::constexpr]] consteval void f2() {} // expected-error {{attribute 'msvc::constexpr' cannot be applied to the consteval function 'f1'}}
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#endif
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struct B1 {};
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struct D1 : virtual B1 { // expected-note {{virtual base class declared here}}
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[[msvc::constexpr]] D1() {} // expected-error {{constexpr constructor not allowed in struct with virtual base class}}
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};
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struct [[msvc::constexpr]] S2{}; // expected-error {{'constexpr' attribute only applies to functions and return statements}}
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// Check invalid code mixed with valid code
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[[msvc::constexpr]] int f4(int x) { return x > 1 ? 1 + f4(x / 2) : 0; } // expected-note {{non-constexpr function 'f4' cannot be used in a constant expression}} \
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// expected-note {{declared here}} \
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// expected-note {{declared here}} \
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// expected-note {{declared here}}
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constexpr bool f5() { [[msvc::constexpr]] return f4(32) == 5; } // expected-note {{in call to 'f4(32)'}}
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static_assert(f5()); // expected-error {{static assertion expression is not an integral constant expression}} \
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// expected-note {{in call to 'f5()'}}
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int f6(int x) { [[msvc::constexpr]] return x > 1 ? 1 + f6(x / 2) : 0; } // expected-note {{declared here}} \
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// expected-note {{declared here}}
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constexpr bool f7() { [[msvc::constexpr]] return f6(32) == 5; } // expected-error {{constexpr function never produces a constant expression}} \
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// expected-note {{non-constexpr function 'f6' cannot be used in a constant expression}} \
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// expected-note {{non-constexpr function 'f6' cannot be used in a constant expression}}
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static_assert(f7()); // expected-error {{static assertion expression is not an integral constant expression}} \
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// expected-note {{in call to 'f7()'}}
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constexpr bool f8() { // expected-error {{constexpr function never produces a constant expression}}
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[[msvc::constexpr]] f4(32); // expected-error {{'constexpr' attribute only applies to functions and return statements}} \
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// expected-note {{non-constexpr function 'f4' cannot be used in a constant expression}} \
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// expected-note {{non-constexpr function 'f4' cannot be used in a constant expression}}
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[[msvc::constexpr]] int i5 = f4(32); // expected-error {{'constexpr' attribute only applies to functions and return statements}}
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return i5 == 5;
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}
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static_assert(f8()); // expected-error {{static assertion expression is not an integral constant expression}} \
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// expected-note {{in call to 'f8()'}}
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#if __cplusplus == 201702L
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struct S1 { [[msvc::constexpr]] virtual bool vm() const { return true; } }; // expected-error {{attribute 'msvc::constexpr' ignored, it only applies to function definitions and return statements}}
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#endif
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