libstdc++: assert that type traits are not misused with incomplete types [PR 71579]

libstdc++-v3/ChangeLog:

	PR libstdc++/71579
	* include/std/type_traits (invoke_result, is_invocable)
	(is_invocable_r, is_nothrow_invocable, is_nothrow_invocable_r):
	Add static_asserts to make sure that the arguments of the type
	traits are not misused with incomplete types.
	* testsuite/20_util/invoke_result/incomplete_args_neg.cc: New test.
	* testsuite/20_util/is_invocable/incomplete_args_neg.cc: New test.
	* testsuite/20_util/is_invocable/incomplete_neg.cc: New test.
	* testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc:
	New test.
	* testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc: Check
	for error on incomplete type usage in trait.

6 files changed, 251 insertions, 0 deletions

diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 6ced781..b7bb63b 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -2965,6 +2965,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Functor>{}),
 	"_Functor must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
     };
 
   /// std::invoke_result_t
@@ -2978,6 +2981,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
 	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
     };
 
   /// std::is_invocable_r
@@ -2987,6 +2993,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
 	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}),
+	"_Ret must be a complete class or an unbounded array");
     };
 
   /// std::is_nothrow_invocable
@@ -2997,6 +3008,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
 	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
     };
 
   template<typename _Result, typename _Ret, typename = void>
@@ -3017,6 +3031,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     {
       static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
 	"_Fn must be a complete class or an unbounded array");
+      static_assert((std::__is_complete_or_unbounded(
+	__type_identity<_ArgTypes>{}) && ...),
+	"each argument type must be a complete class or an unbounded array");
+      static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}),
+	"_Ret must be a complete class or an unbounded array");
     };
 
   /// std::is_invocable_v
diff --git a/libstdc++-v3/testsuite/20_util/invoke_result/incomplete_args_neg.cc b/libstdc++-v3/testsuite/20_util/invoke_result/incomplete_args_neg.cc
new file mode 100644
index 0000000..a35ff4c
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/invoke_result/incomplete_args_neg.cc
@@ -0,0 +1,47 @@
+// { dg-do compile { target c++17 } }
+
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-error "must be a complete class" "" { target *-*-* } 0 }
+
+#include <type_traits>
+
+class X;
+
+void test01()
+{
+  std::invoke_result<int(X), X>();		// { dg-error "required from here" }
+  std::invoke_result<int(int, X), int, X>();		// { dg-error "required from here" }
+  std::invoke_result<int(int, X), X, int>();		// { dg-error "required from here" }
+
+
+  std::invoke_result<int(X&), X&>();		// { dg-bogus "required from here" }
+  std::invoke_result<int(int, X&), int, X&>();		// { dg-bogus "required from here" }
+
+  std::invoke_result<int(X&&), X&&>();		// { dg-bogus "required from here" }
+  std::invoke_result<int(int, X&&), int, X&&>();		// { dg-bogus "required from here" }
+
+  std::invoke_result<int(const X&&), const X&&>();		// { dg-bogus "required from here" }
+  std::invoke_result<int(int, const X&&), int, const X&&>();		// { dg-bogus "required from here" }
+
+  std::invoke_result<int(const X&), const X&>();		// { dg-bogus "required from here" }
+  std::invoke_result<int(int, const X&), int, const X&>();		// { dg-bogus "required from here" }
+
+  std::invoke_result<int(const X&), X&>();		// { dg-bogus "required from here" }
+  std::invoke_result<int(int, const X&), int, X&>();		// { dg-bogus "required from here" }
+}
diff --git a/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_args_neg.cc b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_args_neg.cc
new file mode 100644
index 0000000..a5ce49a
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_args_neg.cc
@@ -0,0 +1,70 @@
+// { dg-do compile { target c++17 } }
+
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-error "must be a complete class" "" { target *-*-* } 0 }
+
+#include <type_traits>
+
+class X;
+
+void test01()
+{
+  std::is_invocable<int(X), X>();		// { dg-error "required from here" }
+  std::is_invocable<int(int, X), int, X>();		// { dg-error "required from here" }
+  std::is_invocable<int(int, X), X, int>();		// { dg-error "required from here" }
+
+
+  std::is_invocable<int(X&), X&>();		// { dg-bogus "required from here" }
+  std::is_invocable<int(int, X&), int, X&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable<int(X&&), X&&>();		// { dg-bogus "required from here" }
+  std::is_invocable<int(int, X&&), int, X&&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable<int(const X&&), const X&&>();		// { dg-bogus "required from here" }
+  std::is_invocable<int(int, const X&&), int, const X&&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable<int(const X&), const X&>();		// { dg-bogus "required from here" }
+  std::is_invocable<int(int, const X&), int, const X&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable<int(const X&), X&>();		// { dg-bogus "required from here" }
+  std::is_invocable<int(int, const X&), int, X&>();		// { dg-bogus "required from here" }
+}
+
+void test02()
+{
+  std::is_invocable_r<int, int(X), X>();		// { dg-error "required from here" }
+  std::is_invocable_r<int, int(int, X), int, X>();		// { dg-error "required from here" }
+  std::is_invocable_r<int, int(int, X), X, int>();		// { dg-error "required from here" }
+
+
+  std::is_invocable_r<int, int(X&), X&>();		// { dg-bogus "required from here" }
+  std::is_invocable_r<int, int(int, X&), int, X&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable_r<int, int(X&&), X&&>();		// { dg-bogus "required from here" }
+  std::is_invocable_r<int, int(int, X&&), int, X&&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable_r<int, int(const X&&), const X&&>();		// { dg-bogus "required from here" }
+  std::is_invocable_r<int, int(int, const X&&), int, const X&&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable_r<int, int(const X&), const X&>();		// { dg-bogus "required from here" }
+  std::is_invocable_r<int, int(int, const X&), int, const X&>();		// { dg-bogus "required from here" }
+
+  std::is_invocable_r<int, int(const X&), X&>();		// { dg-bogus "required from here" }
+  std::is_invocable_r<int, int(int, const X&), int, X&>();		// { dg-bogus "required from here" }
+}
diff --git a/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc
new file mode 100644
index 0000000..3041554
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/is_invocable/incomplete_neg.cc
@@ -0,0 +1,39 @@
+// { dg-do compile { target c++17 } }
+
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-error "must be a complete class" "" { target *-*-* } 0 }
+
+#include <type_traits>
+
+class X;
+
+void test01()
+{
+  std::is_invocable<X, int>();		// { dg-error "required from here" }
+  std::is_invocable<X>();		// { dg-error "required from here" }
+
+  std::is_invocable_r<int, X, int>();		// { dg-error "required from here" }
+  std::is_invocable_r<int, X>();		// { dg-error "required from here" }
+
+  std::is_invocable_r<X, X()>();		// { dg-error "required from here" }
+  std::is_invocable_r<X, X(int), int>();		// { dg-error "required from here" }
+  std::is_invocable_r<X, X(int, int), int, int>();		// { dg-error "required from here" }
+
+  std::is_invocable_r<X, X(), int, int>();		// { dg-error "required from here" }
+}
diff --git a/libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc b/libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc
new file mode 100644
index 0000000..c60e73b
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc
@@ -0,0 +1,70 @@
+// { dg-do compile { target c++17 } }
+
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-error "must be a complete class" "" { target *-*-* } 0 }
+
+#include <type_traits>
+
+class X;
+
+void test01()
+{
+  std::is_nothrow_invocable<int(X), X>();		// { dg-error "required from here" }
+  std::is_nothrow_invocable<int(int, X), int, X>();		// { dg-error "required from here" }
+  std::is_nothrow_invocable<int(int, X), X, int>();		// { dg-error "required from here" }
+
+
+  std::is_nothrow_invocable<int(X&), X&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable<int(int, X&), int, X&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable<int(X&&), X&&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable<int(int, X&&), int, X&&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable<int(const X&&), const X&&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable<int(int, const X&&), int, const X&&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable<int(const X&), const X&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable<int(int, const X&), int, const X&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable<int(const X&), X&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable<int(int, const X&), int, X&>();		// { dg-bogus "required from here" }
+}
+
+void test02()
+{
+  std::is_nothrow_invocable_r<int, int(X), X>();		// { dg-error "required from here" }
+  std::is_nothrow_invocable_r<int, int(int, X), int, X>();		// { dg-error "required from here" }
+  std::is_nothrow_invocable_r<int, int(int, X), X, int>();		// { dg-error "required from here" }
+
+
+  std::is_nothrow_invocable_r<int, int(X&), X&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable_r<int, int(int, X&), int, X&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable_r<int, int(X&&), X&&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable_r<int, int(int, X&&), int, X&&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable_r<int, int(const X&&), const X&&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable_r<int, int(int, const X&&), int, const X&&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable_r<int, int(const X&), const X&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable_r<int, int(int, const X&), int, const X&>();		// { dg-bogus "required from here" }
+
+  std::is_nothrow_invocable_r<int, int(const X&), X&>();		// { dg-bogus "required from here" }
+  std::is_nothrow_invocable_r<int, int(int, const X&), int, X&>();		// { dg-bogus "required from here" }
+}
diff --git a/libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc b/libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc
index ad16809..ef87171 100644
--- a/libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc
+++ b/libstdc++-v3/testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc
@@ -30,4 +30,10 @@ void test01()
 
   std::is_nothrow_invocable_r<int, X>();		// { dg-error "required from here" }
   std::is_nothrow_invocable_r<int, X, short>();		// { dg-error "required from here" }
+
+  std::is_nothrow_invocable_r<X, X()>();		// { dg-error "required from here" }
+  std::is_nothrow_invocable_r<X, X(int), int>();		// { dg-error "required from here" }
+  std::is_nothrow_invocable_r<X, X(int, int), int, int>();		// { dg-error "required from here" }
+
+  std::is_nothrow_invocable_r<X, X(), int, int>();		// { dg-error "required from here" }
 }