shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
llvm-project/clang/test/CodeGenCXX/mangle-concept.cpp
Richard Smith 4b163e343c Implement mangling rules for C++20 concepts and requires-expressions. 
This implements proposals from:

- https://github.com/itanium-cxx-abi/cxx-abi/issues/24: mangling for
  constraints, requires-clauses, requires-expressions.
- https://github.com/itanium-cxx-abi/cxx-abi/issues/31: requires-clauses and
  template parameters in a lambda expression are mangled into the <lambda-sig>.
- https://github.com/itanium-cxx-abi/cxx-abi/issues/47 (STEP 3): mangling for
  template argument is prefixed by mangling of template parameter declaration
  if it's not "obvious", for example because the template parameter is
  constrained (we already implemented STEP 1 and STEP 2).

This changes the manglings for a few cases:

- Functions and function templates with constraints.
- Function templates with template parameters with deduced types:
  `typename<auto N> void f();`
- Function templates with template template parameters where the argument has a
  different template-head:
  `template<template<typename...T>> void f(); f<std::vector>();`

In each case where a mangling changed, the change fixes a mangling collision.

Note that only function templates are affected, not class templates or variable
templates, and only new constructs (template parameters with deduced types,
constrained templates) and esoteric constructs (templates with template
template parameters with non-matching template template arguments, most of
which Clang still does not accept by default due to
`-frelaxed-template-template-args` not being enabled by default), so the risk
to ABI stability from this change is relatively low. Nonetheless,
`-fclang-abi-compat=17` can be used to restore the old manglings for cases
which we could successfully but incorrectly mangle before.

Fixes #48216, #49884, #61273

Reviewed By: erichkeane, #libc_abi

Differential Revision: https://reviews.llvm.org/D147655
2023-09-20 12:38:15 -07:00

223 lines
7.8 KiB
C++
Raw Blame History

// RUN: %clang_cc1 -verify -frelaxed-template-template-args -std=c++20 -emit-llvm -triple %itanium_abi_triple -o - %s | FileCheck %s
// RUN: %clang_cc1 -verify -frelaxed-template-template-args -std=c++20 -emit-llvm -triple %itanium_abi_triple -o - %s -fclang-abi-compat=16 | FileCheck %s --check-prefix=CLANG16
// expected-no-diagnostics
namespace test1 {
template <bool> struct S {};
template <typename> concept C = true;
template <typename T = int> S<C<T>> f0() { return S<C<T>>{}; }
template S<C<int>> f0<>();
// CHECK: @_ZN5test12f0IiEENS_1SIX1CIT_EEEEv(
// CLANG16: @_ZN5test12f0IiEENS_1SIL_ZNS_1CIT_EEEEEv(
}
template <bool> struct S {};
template <typename> concept C = true;
template <typename, typename> concept D = true;
template <typename T = int> S<test1::C<T>> f0a() { return S<C<T>>{}; }
template S<test1::C<int>> f0a<>();
// CHECK: @_Z3f0aIiE1SIXsr5test1E1CIT_EEEv(
// CLANG16: @_Z3f0aIiE1SIL_ZN5test11CIT_EEEEv(
template <typename T = int> S<C<T>> f0() { return S<C<T>>{}; }
template S<C<int>> f0<>();
// CHECK: @_Z2f0IiE1SIX1CIT_EEEv(
// CLANG16: @_Z2f0IiE1SIL_Z1CIT_EEEv(
template<typename T> concept True = true;
namespace test2 {
// Member-like friends.
template<typename T> struct A {
friend void f(...) requires True<T> {}
template<typename U = void>
friend void g(...) requires True<T> && True<U> {}
template<typename U = void>
friend void h(...) requires True<U> {}
template<typename U = void> requires True<T> && True<U>
friend void i(...) {}
template<typename U = void> requires True<U>
friend void j(...) {}
template<True U = void> requires True<T>
friend void k(...) {}
template<True U = void>
friend void l(...) {}
};
A<int> ai;
// CHECK-LABEL: define {{.*}}@{{.*}}test2{{.*}}use
void use() {
// CHECK: call {{.*}}@_ZN5test21AIiEF1fEzQ4TrueIT_E(
// CLANG16: call {{.*}}@_ZN5test21fEz(
f(ai);
// CHECK: call {{.*}}@_ZN5test2F1gIvEEvzQaa4TrueIT_E4TrueITL0__E(
// CLANG16: call {{.*}}@_ZN5test21gIvEEvz(
g(ai);
// CHECK: call {{.*}}@_ZN5test21hIvEEvzQ4TrueITL0__E(
// CLANG16: call {{.*}}@_ZN5test21hIvEEvz(
h(ai);
// CHECK: call {{.*}}@_ZN5test2F1iIvQaa4TrueIT_E4TrueITL0__EEEvz(
// CLANG16: call {{.*}}@_ZN5test21iIvEEvz(
i(ai);
// CHECK: call {{.*}}@_ZN5test21jIvQ4TrueITL0__EEEvz(
// CLANG16: call {{.*}}@_ZN5test21jIvEEvz(
j(ai);
// CHECK: call {{.*}}@_ZN5test2F1kITk4TruevQ4TrueIT_EEEvz(
// CLANG16: call {{.*}}@_ZN5test21kIvEEvz(
k(ai);
// CHECK: call {{.*}}@_ZN5test21lITk4TruevEEvz(
// CLANG16: call {{.*}}@_ZN5test21lIvEEvz(
l(ai);
}
}
namespace test3 {
// Unconstrained auto.
template<auto> void d() {}
template void d<0>();
// CHECK: define {{.*}}@_ZN5test31dITnDaLi0EEEvv(
// CLANG16: define {{.*}}@_ZN5test31dILi0EEEvv(
template<decltype(auto)> void e() {}
template void e<0>();
// CHECK: define {{.*}}@_ZN5test31eITnDcLi0EEEvv(
// CLANG16: define {{.*}}@_ZN5test31eILi0EEEvv(
// Constrained auto.
template<C auto> void f() {}
template void f<0>();
// CHECK: define {{.*}}@_ZN5test31fITnDk1CLi0EEEvv(
// CLANG16: define {{.*}}@_ZN5test31fILi0EEEvv(
template<D<int> auto> void g() {}
template void g<0>();
// CHECK: define {{.*}}@_ZN5test31gITnDk1DIiELi0EEEvv(
// CLANG16: define {{.*}}@_ZN5test31gILi0EEEvv(
template<typename T, D<T> auto> void h() {}
template void h<int, 0>();
// CHECK: define {{.*}}@_ZN5test31hIiTnDk1DIT_ELi0EEEvv(
// CLANG16: define {{.*}}@_ZN5test31hIiLi0EEEvv(
template<typename T> void i(decltype(new C auto(T()))) {}
template void i<int>(int*);
// CHECK: define {{.*}}@_ZN5test31iIiEEvDTnw_Dk1CpicvT__EEE(
// CLANG16: define {{.*}}@_ZN5test31iIiEEvDTnw_DapicvT__EEE(
template<typename T> void j(decltype(new C decltype(auto)(T()))) {}
template void j<int>(int*);
// CHECK: define {{.*}}@_ZN5test31jIiEEvDTnw_DK1CpicvT__EEE(
// CLANG16: define {{.*}}@_ZN5test31jIiEEvDTnw_DcpicvT__EEE(
}
namespace test4 {
// Constrained type parameters.
template<C> void f() {}
template void f<int>();
// CHECK: define {{.*}}@_ZN5test41fITk1CiEEvv(
// CLANG16: define {{.*}}@_ZN5test41fIiEEvv(
template<D<int>> void g() {}
template void g<int>();
// CHECK: define {{.*}}@_ZN5test41gITk1DIiEiEEvv(
// CLANG16: define {{.*}}@_ZN5test41gIiEEvv(
}
namespace test5 {
// Exact-match vs non-exact-match template template parameters.
template<typename T, T V> struct X {};
template<typename T, T V> requires C<T> struct Y {};
template<C T, T V> struct Z {};
template<template<typename T, T> typename> void f() {}
// CHECK: define {{.*}}@_ZN5test51fINS_1XEEEvv(
template void f<X>();
// CHECK: define {{.*}}@_ZN5test51fITtTyTnTL0__ENS_1YEEEvv(
template void f<Y>();
// CHECK: define {{.*}}@_ZN5test51fITtTyTnTL0__ENS_1ZEEEvv(
template void f<Z>();
template<template<typename T, T> requires C<T> typename> void g() {}
// CHECK: define {{.*}}@_ZN5test51gITtTyTnTL0__Q1CIS1_EENS_1XEEEvv(
template void g<X>();
// CHECK: define {{.*}}@_ZN5test51gINS_1YEEEvv(
template void g<Y>();
// CHECK: define {{.*}}@_ZN5test51gITtTyTnTL0__Q1CIS1_EENS_1ZEEEvv(
template void g<Z>();
template<template<C T, T> typename> void h() {}
// CHECK: define {{.*}}@_ZN5test51hITtTk1CTnTL0__ENS_1XEEEvv(
template void h<X>();
// CHECK: define {{.*}}@_ZN5test51hITtTk1CTnTL0__ENS_1YEEEvv(
template void h<Y>();
// CHECK: define {{.*}}@_ZN5test51hINS_1ZEEEvv(
template void h<Z>();
// Packs must match the first argument.
template<template<C T, T> typename...> void i() {}
// CHECK: define {{.*}}@_ZN5test51iITpTtTk1CTnTL0__EJNS_1XENS_1YENS_1ZEEEEvv(
template void i<X, Y, Z>();
// CHECK: define {{.*}}@_ZN5test51iITpTtTk1CTnTL0__EJNS_1YENS_1ZENS_1XEEEEvv(
template void i<Y, Z, X>();
// CHECK: define {{.*}}@_ZN5test51iIJNS_1ZENS_1XENS_1YEEEEvv(
template void i<Z, X, Y>();
template<typename ...T> struct A {};
template<typename, typename> struct B {};
template<template<typename ...> typename> void p() {}
// CHECK: define {{.*}}@_ZN5test51pINS_1AEEEvv(
// CLANG16: define {{.*}}@_ZN5test51pINS_1AEEEvv(
template void p<A>();
// CHECK: define {{.*}}@_ZN5test51pITtTpTyENS_1BEEEvv(
// CLANG16: define {{.*}}@_ZN5test51pINS_1BEEEvv(
template void p<B>();
template<template<typename, typename> typename> void q() {}
// CHECK: define {{.*}}@_ZN5test51qITtTyTyENS_1AEEEvv(
// CLANG16: define {{.*}}@_ZN5test51qINS_1AEEEvv(
template void q<A>();
// CHECK: define {{.*}}@_ZN5test51qINS_1BEEEvv(
// CLANG16: define {{.*}}@_ZN5test51qINS_1BEEEvv(
template void q<B>();
}
namespace test6 {
// Abbreviated function templates.
void f(C auto) {}
// CHECK: define {{.*}}@_ZN5test61fITk1CiEEvT_(
// CLANG16: define {{.*}}@_ZN5test61fIiEEvT_(
template void f(int);
template<typename T>
void g(D<T> auto) {}
// CHECK: define {{.*}}@_ZN5test61gIiTk1DIT_EiEEvT0_(
// CLANG16: define {{.*}}@_ZN5test61gIiiEEvT0_(
template void g<int>(int);
}
namespace test7 {
// Constrained lambdas.
template<typename T> void f() {
// Ensure that requires-clauses affect lambda numbering.
// CHECK-LABEL: define {{.*}}@_ZN5test71fIiEEvv(
// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyQaa1CIT_E1CITL0__ET0_E_clIiiEEDaS3_Q1CIDtfp_EE(
([]<typename U> requires C<T> && C<U> (auto x) requires C<decltype(x)> {}).template operator()<int>(0);
// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyQaa1CIT_E1CITL0__ET0_E0_clIiiEEDaS3_Qaa1CIDtfp_EELb1E(
([]<typename U> requires C<T> && C<U> (auto x) requires C<decltype(x)> && true {}).template operator()<int>(0);
// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyQaa1CIT_E1CITL0__ET0_E1_clIiiEEDaS3_Q1CIDtfp_EE(
([]<typename U> requires C<T> && C<U> (auto x) requires C<decltype(x)> {}).template operator()<int>(0);
// CHECK: call {{.*}}@_ZZN5test71fIiEEvvENKUlTyT0_E_clIiiEEDaS1_(
([]<typename U> (auto x){}).template operator()<int>(0);
}
template void f<int>();
}
Reference in New Issue View Git Blame Copy Permalink