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llvm-project/clang/test/CodeGenCXX/clang-abi-compat.cpp

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Consider reference, pointer, and pointer-to-member TemplateArguments to be different if they have different types. For the Itanium ABI, this implements the mangling rule suggested in https://github.com/itanium-cxx-abi/cxx-abi/issues/47, namely mangling such template arguments as being cast to the parameter type in the case where the template name is overloadable. This can cause a mangling change for rare cases, where * the template argument declaration is converted from its declared type to the type of the template parameter, and * the template parameter either has a deduced type or is a parameter of a function template. However, such changes are necessary to avoid mangling collisions. The ABI changes can be reversed with -fclang-abi-compat=11 or earlier. Re-commit with a fix for a couple of regressions. Differential Revision: https://reviews.llvm.org/D91488
2020-11-15 09:37:25 +08:00
// RUN: %clang_cc1 -std=c++98 -triple x86_64-linux-gnu -fclang-abi-compat=3.0 %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,PRE39,PRE5,PRE12 %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=3.0 %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,PRE39,PRE5,PRE12 %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=3.8 %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,PRE39,PRE5,PRE12 %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=3.9 %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,V39,PRE5,PRE12 %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=4.0 %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,V39,PRE5,PRE12 %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=5 %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,V39,V5,PRE12,PRE12-CXX17 %s
// RUN: %clang_cc1 -std=c++17 -triple x86_64-linux-gnu -fclang-abi-compat=11 %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,V39,V5,PRE12,PRE12-CXX17 %s
// RUN: %clang_cc1 -std=c++98 -triple x86_64-linux-gnu -fclang-abi-compat=latest %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,V39,V5,V12 %s
// RUN: %clang_cc1 -std=c++20 -triple x86_64-linux-gnu -fclang-abi-compat=latest %s -emit-llvm -o - | FileCheck --check-prefixes=CHECK,V39,V5,V12,V12-CXX17 %s
Add flag to request Clang is ABI-compatible with older versions of itself This patch adds a flag -fclang-abi-compat that can be used to request that Clang attempts to be ABI-compatible with some older version of itself. This is provided on a best-effort basis; right now, this can be used to undo the ABI change in r310401, reverting Clang to its prior C++ ABI for pass/return by value of class types affected by that change, and to undo the ABI change in r262688, reverting Clang to using integer registers rather than SSE registers for passing <1 x long long> vectors. The intent is that we will maintain this backwards compatibility path as we make ABI-breaking fixes in future. The reversion to the old behavior for r310401 is also applied to the PS4 target since that change is not part of its platform ABI (which is essentially to do whatever Clang 3.2 did). llvm-svn: 311823
2017-08-26 09:04:35 +08:00
typedef __attribute__((vector_size(8))) long long v1xi64;
void clang39(v1xi64) {}
// PRE39: @_Z7clang39Dv1_x(i64
// V39: @_Z7clang39Dv1_x(double
struct A {
A(const A&) = default;
A(A&&);
};
void clang5(A) {}
// PRE5: @_Z6clang51A()
// V5: @_Z6clang51A(%{{.*}}*
Fix mangling of substitutions for template-prefixes. Previously we only considered using a substitution for a template-name after already having mangled its prefix, so we'd produce nonsense manglings like NS3_S4_IiEE where we should simply produce NS4_IiEE. This is not ABI-compatible with previous Clang versions, and the old behavior is restored by -fclang-abi-compat=11.0 or earlier.
2020-11-25 07:20:06 +08:00
namespace mangle_template_prefix {
// PRE12: @_ZN22mangle_template_prefix1fINS_1TEEEvNT_1UIiE1VIiEENS4_S5_IfEE(
// V12: @_ZN22mangle_template_prefix1fINS_1TEEEvNT_1UIiE1VIiEENS5_IfEE(
template<typename T> void f(typename T::template U<int>::template V<int>, typename T::template U<int>::template V<float>);
struct T { template<typename I> struct U { template<typename J> using V = int; }; };
void g() { f<T>(1, 2); }
}
Consider reference, pointer, and pointer-to-member TemplateArguments to be different if they have different types. For the Itanium ABI, this implements the mangling rule suggested in https://github.com/itanium-cxx-abi/cxx-abi/issues/47, namely mangling such template arguments as being cast to the parameter type in the case where the template name is overloadable. This can cause a mangling change for rare cases, where * the template argument declaration is converted from its declared type to the type of the template parameter, and * the template parameter either has a deduced type or is a parameter of a function template. However, such changes are necessary to avoid mangling collisions. The ABI changes can be reversed with -fclang-abi-compat=11 or earlier. Re-commit with a fix for a couple of regressions. Differential Revision: https://reviews.llvm.org/D91488
2020-11-15 09:37:25 +08:00
int arg;
template<const int *> struct clang12_unchanged {};
// CHECK: @_Z4test17clang12_unchangedIXadL_Z3argEEE
void test(clang12_unchanged<&arg>) {}
#if __cplusplus >= 201703L
// PRE12-CXX17: @_Z4test15clang12_changedIXadL_Z3argEEE
// V12-CXX17: @_Z4test15clang12_changedIXcvPKiadL_Z3argEEE
template<auto> struct clang12_changed {};
void test(clang12_changed<(const int*)&arg>) {}
#endif
// PRE12: @_Z9clang12_aIXadL_Z3argEEEvv
// V12: @_Z9clang12_aIXcvPKiadL_Z3argEEEvv
template<const int *> void clang12_a() {}
template void clang12_a<&arg>();
// PRE12: @_Z9clang12_bIXadL_Z3arrEEEvv
// V12: @_Z9clang12_bIXadsoKcL_Z3arrEEEEvv
extern const char arr[6] = "hello";
template<const char *> void clang12_b() {}
template void clang12_b<arr>();
// CHECK: @_Z9clang12_cIXadL_Z3arrEEEvv
template<const char (*)[6]> void clang12_c() {}
template void clang12_c<&arr>();