28ed57eda8
This is a first pass at implementing [P2841R7](https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2025/p2841r7.pdf). The implementation is far from complete; however, I'm aiming to do that in chunks, to make our lives easier. In particular, this does not implement - Subsumption - Mangling - Satisfaction checking is minimal as we should focus on #141776 first (note that I'm currently very stuck) FTM, release notes, status page, etc, will be updated once the feature is more mature. Given the state of the feature, it is not yet allowed in older language modes. Of note: - Mismatches between template template arguments and template template parameters are a bit wonky. This is addressed by #130603 - We use `UnresolvedLookupExpr` to model template-id. While this is pre-existing, I have been wondering if we want to introduce a different OverloadExpr subclass for that. I did not make the change in this patch.
248 lines
8.9 KiB
C++
248 lines
8.9 KiB
C++
// RUN: %clang_cc1 -verify -std=c++20 -emit-llvm -triple %itanium_abi_triple -o - %s -fclang-abi-compat=latest | FileCheck %s
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// RUN: %clang_cc1 -verify -std=c++20 -emit-llvm -triple %itanium_abi_triple -o - %s -fclang-abi-compat=19 | FileCheck %s --check-prefix=CLANG19
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// RUN: %clang_cc1 -verify -std=c++20 -emit-llvm -triple %itanium_abi_triple -o - %s -fclang-abi-compat=17 | FileCheck %s --check-prefix=CLANG17
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// expected-no-diagnostics
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namespace test1 {
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template <bool> struct S {};
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template <typename> concept C = true;
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template <typename T = int>
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S<C<T>> f0() { return S<C<T>>{}; }
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template S<C<int>> f0<>();
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// CHECK: @_ZN5test12f0IiEENS_1SIX1CIT_EEEEv(
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// CLANG17: @_ZN5test12f0IiEENS_1SIL_ZNS_1CIT_EEEEEv(
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}
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template <bool> struct S {};
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template <typename> concept C = true;
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template <typename, typename> concept D = true;
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template <typename T = int> S<test1::C<T>> f0a() { return S<C<T>>{}; }
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template S<test1::C<int>> f0a<>();
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// CHECK: @_Z3f0aIiE1SIXsr5test1E1CIT_EEEv(
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// CLANG17: @_Z3f0aIiE1SIL_ZN5test11CIT_EEEEv(
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template <typename T = int> S<C<T>> f0() { return S<C<T>>{}; }
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template S<C<int>> f0<>();
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// CHECK: @_Z2f0IiE1SIX1CIT_EEEv(
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// CLANG17: @_Z2f0IiE1SIL_Z1CIT_EEEv(
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template<typename T> concept True = true;
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namespace test2 {
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// Member-like friends.
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template<typename T> struct A {
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friend void f(...) requires True<T> {}
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template<typename U = void>
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friend void g(...) requires True<T> && True<U> {}
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template<typename U = void>
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friend void h(...) requires True<U> {}
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template<typename U = void> requires True<T> && True<U>
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friend void i(...) {}
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template<typename U = void> requires True<U>
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friend void j(...) {}
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template<True U = void> requires True<T>
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friend void k(...) {}
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template<True U = void>
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friend void l(...) {}
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};
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A<int> ai;
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// CHECK-LABEL: define {{.*}}@{{.*}}test2{{.*}}use
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void use() {
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// CHECK: call {{.*}}@_ZN5test21AIiEF1fEzQ4TrueIT_E(
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// CLANG17: call {{.*}}@_ZN5test21fEz(
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f(ai);
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// CHECK: call {{.*}}@_ZN5test21AIiEF1gIvEEvzQaa4TrueIT_E4TrueITL0__E(
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// CLANG19: call {{.*}}@_ZN5test2F1gIvEEvzQaa4TrueIT_E4TrueITL0__E(
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// CLANG17: call {{.*}}@_ZN5test21gIvEEvz(
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g(ai);
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// CHECK: call {{.*}}@_ZN5test21hIvEEvzQ4TrueITL0__E(
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// CLANG17: call {{.*}}@_ZN5test21hIvEEvz(
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h(ai);
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// CHECK: call {{.*}}@_ZN5test21AIiEF1iIvQaa4TrueIT_E4TrueITL0__EEEvz(
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// CLANG19: call {{.*}}@_ZN5test2F1iIvQaa4TrueIT_E4TrueITL0__EEEvz(
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// CLANG17: call {{.*}}@_ZN5test21iIvEEvz(
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i(ai);
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// CHECK: call {{.*}}@_ZN5test21jIvQ4TrueITL0__EEEvz(
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// CLANG17: call {{.*}}@_ZN5test21jIvEEvz(
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j(ai);
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// CHECK: call {{.*}}@_ZN5test21AIiEF1kITk4TruevQ4TrueIT_EEEvz(
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// CLANG19: call {{.*}}@_ZN5test2F1kITk4TruevQ4TrueIT_EEEvz(
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// CLANG17: call {{.*}}@_ZN5test21kIvEEvz(
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k(ai);
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// CHECK: call {{.*}}@_ZN5test21lITk4TruevEEvz(
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// CLANG17: call {{.*}}@_ZN5test21lIvEEvz(
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l(ai);
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}
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}
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namespace test3 {
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// Unconstrained auto.
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template<auto> void d() {}
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template void d<0>();
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// CHECK: define {{.*}}@_ZN5test31dITnDaLi0EEEvv(
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// CLANG17: define {{.*}}@_ZN5test31dILi0EEEvv(
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template<decltype(auto)> void e() {}
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template void e<0>();
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// CHECK: define {{.*}}@_ZN5test31eITnDcLi0EEEvv(
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// CLANG17: define {{.*}}@_ZN5test31eILi0EEEvv(
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// Constrained auto.
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template<C auto> void f() {}
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template void f<0>();
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// CHECK: define {{.*}}@_ZN5test31fITnDk1CLi0EEEvv(
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// CLANG17: define {{.*}}@_ZN5test31fILi0EEEvv(
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template<D<int> auto> void g() {}
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template void g<0>();
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// CHECK: define {{.*}}@_ZN5test31gITnDk1DIiELi0EEEvv(
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// CLANG17: define {{.*}}@_ZN5test31gILi0EEEvv(
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template<typename T, D<T> auto> void h() {}
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template void h<int, 0>();
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// CHECK: define {{.*}}@_ZN5test31hIiTnDk1DIT_ELi0EEEvv(
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// CLANG17: define {{.*}}@_ZN5test31hIiLi0EEEvv(
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template<typename T> void i(decltype(new C auto(T()))) {}
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template void i<int>(int*);
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// CHECK: define {{.*}}@_ZN5test31iIiEEvDTnw_Dk1CpicvT__EEE(
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// CLANG17: define {{.*}}@_ZN5test31iIiEEvDTnw_DapicvT__EEE(
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template<typename T> void j(decltype(new C decltype(auto)(T()))) {}
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template void j<int>(int*);
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// CHECK: define {{.*}}@_ZN5test31jIiEEvDTnw_DK1CpicvT__EEE(
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// CLANG17: define {{.*}}@_ZN5test31jIiEEvDTnw_DcpicvT__EEE(
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}
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namespace test4 {
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// Constrained type parameters.
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template<C> void f() {}
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template void f<int>();
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// CHECK: define {{.*}}@_ZN5test41fITk1CiEEvv(
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// CLANG17: define {{.*}}@_ZN5test41fIiEEvv(
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template<D<int>> void g() {}
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template void g<int>();
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// CHECK: define {{.*}}@_ZN5test41gITk1DIiEiEEvv(
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// CLANG17: define {{.*}}@_ZN5test41gIiEEvv(
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}
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namespace test5 {
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// Exact-match vs non-exact-match template template parameters.
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template<typename T, T V> struct X {};
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template<typename T, T V> requires C<T> struct Y {};
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template<C T, T V> struct Z {};
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template<template<typename T, T> typename> void f() {}
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// CHECK: define {{.*}}@_ZN5test51fINS_1XEEEvv(
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template void f<X>();
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// CHECK: define {{.*}}@_ZN5test51fITtTyTnTL0__ENS_1YEEEvv(
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template void f<Y>();
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// CHECK: define {{.*}}@_ZN5test51fITtTyTnTL0__ENS_1ZEEEvv(
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template void f<Z>();
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template<template<typename T, T> requires C<T> typename> void g() {}
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// CHECK: define {{.*}}@_ZN5test51gITtTyTnTL0__Q1CIS1_EENS_1XEEEvv(
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template void g<X>();
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// CHECK: define {{.*}}@_ZN5test51gINS_1YEEEvv(
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template void g<Y>();
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// CHECK: define {{.*}}@_ZN5test51gITtTyTnTL0__Q1CIS1_EENS_1ZEEEvv(
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template void g<Z>();
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template<template<C T, T> typename> void h() {}
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// CHECK: define {{.*}}@_ZN5test51hITtTk1CTnTL0__ENS_1XEEEvv(
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template void h<X>();
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// CHECK: define {{.*}}@_ZN5test51hITtTk1CTnTL0__ENS_1YEEEvv(
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template void h<Y>();
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// CHECK: define {{.*}}@_ZN5test51hINS_1ZEEEvv(
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template void h<Z>();
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// Packs must match the first argument.
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template<template<C T, T> typename...> void i() {}
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// CHECK: define {{.*}}@_ZN5test51iITpTtTk1CTnTL0__EJNS_1XENS_1YENS_1ZEEEEvv(
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template void i<X, Y, Z>();
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// CHECK: define {{.*}}@_ZN5test51iITpTtTk1CTnTL0__EJNS_1YENS_1ZENS_1XEEEEvv(
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template void i<Y, Z, X>();
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// CHECK: define {{.*}}@_ZN5test51iIJNS_1ZENS_1XENS_1YEEEEvv(
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template void i<Z, X, Y>();
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template<typename ...T> struct A {};
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template<typename, typename> struct B {};
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template<template<typename ...> typename> void p() {}
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// CHECK: define {{.*}}@_ZN5test51pINS_1AEEEvv(
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// CLANG17: define {{.*}}@_ZN5test51pINS_1AEEEvv(
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template void p<A>();
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// CHECK: define {{.*}}@_ZN5test51pITtTpTyENS_1BEEEvv(
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// CLANG17: define {{.*}}@_ZN5test51pINS_1BEEEvv(
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template void p<B>();
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template<template<typename, typename> typename> void q() {}
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// CHECK: define {{.*}}@_ZN5test51qITtTyTyENS_1AEEEvv(
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// CLANG17: define {{.*}}@_ZN5test51qINS_1AEEEvv(
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template void q<A>();
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// CHECK: define {{.*}}@_ZN5test51qINS_1BEEEvv(
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// CLANG17: define {{.*}}@_ZN5test51qINS_1BEEEvv(
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template void q<B>();
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}
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namespace test6 {
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// Abbreviated function templates.
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void f(C auto) {}
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// CHECK: define {{.*}}@_ZN5test61fITk1CiEEvT_(
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// CLANG17: define {{.*}}@_ZN5test61fIiEEvT_(
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template void f(int);
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template<typename T>
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void g(D<T> auto) {}
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// CHECK: define {{.*}}@_ZN5test61gIiTk1DIT_EiEEvT0_(
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// CLANG17: define {{.*}}@_ZN5test61gIiiEEvT0_(
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template void g<int>(int);
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}
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namespace test7 {
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// Constrained lambdas.
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template<typename T> void f() {
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// Ensure that requires-clauses affect lambda numbering.
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// CHECK-LABEL: define {{.*}}@_ZN5test71fIiEEvv(
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// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyQaa1CIT_E1CITL0__ET0_E_clIiiEEDaS3_Q1CIDtfp_EE(
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([]<typename U> requires C<T> && C<U> (auto x) requires C<decltype(x)> {}).template operator()<int>(0);
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// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyQaa1CIT_E1CITL0__ET0_E0_clIiiEEDaS3_Qaa1CIDtfp_EELb1E(
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([]<typename U> requires C<T> && C<U> (auto x) requires C<decltype(x)> && true {}).template operator()<int>(0);
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// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyQaa1CIT_E1CITL0__ET0_E1_clIiiEEDaS3_Q1CIDtfp_EE(
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([]<typename U> requires C<T> && C<U> (auto x) requires C<decltype(x)> {}).template operator()<int>(0);
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// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyT0_E_clIiiEEDaS1_(
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([]<typename U> (auto x){}).template operator()<int>(0);
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}
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template void f<int>();
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}
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namespace gh67244 {
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template<typename T, typename ...Ts> constexpr bool B = true;
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template<typename T, typename ...Ts> concept C = B<T, Ts...>;
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template<C<int, float> T> void f(T) {}
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// CHECK: define {{.*}} @_ZN7gh672441fITkNS_1CIifEEiEEvT_(
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template void f(int);
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}
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namespace gh67356 {
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template<typename, typename T> concept C = true;
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template<typename T> void f(T t, C<decltype(t)> auto) {}
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// CHECK: define {{.*}} @_ZN7gh673561fIiTkNS_1CIDtfL0p_EEEiEEvT_T0_(
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template void f(int, int);
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// Note, we use `fL0p` not `fp` above because:
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template<typename T> void g(T t, C<auto (T u) -> decltype(f(t, u))> auto) {}
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// CHECK: define {{.*}} @_ZN7gh673561gIiTkNS_1CIFDTcl1ffL0p_fp_EET_EEEiEEvS3_T0_(
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template void g(int, int);
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}
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