From 8a7bcf95a82c3dd68bd4bcfbd8432eb970575bc2 Mon Sep 17 00:00:00 2001
From: Marek Polacek <polacek@redhat.com>
Date: Tue, 20 Sep 2022 15:48:52 -0400
Subject: c++: Implement __is_{nothrow_,}convertible [PR106784]

To improve compile times, the C++ library could use compiler built-ins
rather than implementing std::is_convertible (and _nothrow) as class
templates.  This patch adds the built-ins.  We already have
__is_constructible and __is_assignable, and the nothrow forms of those.

Microsoft (and clang, for compatibility) also provide an alias called
__is_convertible_to.  I did not add it, but it would be trivial to do
so.

I noticed that our __is_assignable doesn't implement the "Access checks
are performed as if from a context unrelated to either type" requirement,
therefore std::is_assignable / __is_assignable give two different results
here:

  class S {
    operator int();
    friend void g(); // #1
  };

  void
  g ()
  {
    // #1 doesn't matter
    static_assert(std::is_assignable<int&, S>::value, "");
    static_assert(__is_assignable(int&, S), "");
  }

This is not a problem if __is_assignable is not meant to be used by
the users.

This patch doesn't make libstdc++ use the new built-ins, but I had to
rename a class otherwise its name would clash with the new built-in.

	PR c++/106784

gcc/c-family/ChangeLog:

	* c-common.cc (c_common_reswords): Add __is_convertible and
	__is_nothrow_convertible.
	* c-common.h (enum rid): Add RID_IS_CONVERTIBLE and
	RID_IS_NOTHROW_CONVERTIBLE.

gcc/cp/ChangeLog:

	* constraint.cc (diagnose_trait_expr): Handle CPTK_IS_CONVERTIBLE
	and CPTK_IS_NOTHROW_CONVERTIBLE.
	* cp-objcp-common.cc (names_builtin_p): Handle RID_IS_CONVERTIBLE
	RID_IS_NOTHROW_CONVERTIBLE.
	* cp-tree.h (enum cp_trait_kind): Add CPTK_IS_CONVERTIBLE and
	CPTK_IS_NOTHROW_CONVERTIBLE.
	(is_convertible): Declare.
	(is_nothrow_convertible): Likewise.
	* cxx-pretty-print.cc (pp_cxx_trait_expression): Handle
	CPTK_IS_CONVERTIBLE and CPTK_IS_NOTHROW_CONVERTIBLE.
	* method.cc (is_convertible): New.
	(is_nothrow_convertible): Likewise.
	* parser.cc (cp_parser_primary_expression): Handle RID_IS_CONVERTIBLE
	and RID_IS_NOTHROW_CONVERTIBLE.
	(cp_parser_trait_expr): Likewise.
	* semantics.cc (trait_expr_value): Handle CPTK_IS_CONVERTIBLE and
	CPTK_IS_NOTHROW_CONVERTIBLE.
	(finish_trait_expr): Likewise.

libstdc++-v3/ChangeLog:

	* include/std/type_traits: Rename __is_nothrow_convertible to
	__is_nothrow_convertible_lib.
	* testsuite/20_util/is_nothrow_convertible/value_ext.cc: Likewise.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/has-builtin-1.C: Enhance to test __is_convertible and
	__is_nothrow_convertible.
	* g++.dg/ext/is_convertible1.C: New test.
	* g++.dg/ext/is_convertible2.C: New test.
	* g++.dg/ext/is_nothrow_convertible1.C: New test.
	* g++.dg/ext/is_nothrow_convertible2.C: New test.
---
 gcc/cp/cp-objcp-common.cc | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'gcc/cp/cp-objcp-common.cc')

diff --git a/gcc/cp/cp-objcp-common.cc b/gcc/cp/cp-objcp-common.cc
index 1ffac08..6497569 100644
--- a/gcc/cp/cp-objcp-common.cc
+++ b/gcc/cp/cp-objcp-common.cc
@@ -463,6 +463,8 @@ names_builtin_p (const char *name)
     case RID_IS_NOTHROW_ASSIGNABLE:
     case RID_IS_NOTHROW_CONSTRUCTIBLE:
     case RID_UNDERLYING_TYPE:
+    case RID_IS_CONVERTIBLE:
+    case RID_IS_NOTHROW_CONVERTIBLE:
     case RID_REF_CONSTRUCTS_FROM_TEMPORARY:
     case RID_REF_CONVERTS_FROM_TEMPORARY:
       return true;
-- 
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