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libstdc++: Define pretty printer for comparison categories 

* python/libstdcxx/v6/printers.py (StdCmpCatPrinter): New printer.
	* testsuite/libstdc++-prettyprinters/cxx20.cc: New test.

From-SVN: r278982
This commit is contained in:
Jonathan Wakely 2019-12-05 00:42:11 +00:00 committed by Jonathan Wakely
parent 3a4cc6281b
commit a59c50bd14
3 changed files with 83 additions and 0 deletions
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3
libstdc++-v3/ChangeLog
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@ -1,5 +1,8 @@
2019-12-05 Jonathan Wakely <jwakely@redhat.com>
* python/libstdcxx/v6/printers.py (StdCmpCatPrinter): New printer.
* testsuite/libstdc++-prettyprinters/cxx20.cc: New test.
* include/bits/cpp_type_traits.h (__is_byte<char8_t>): Add
specialization.
* include/std/array (operator<=>): Likewise.

19
libstdc++-v3/python/libstdcxx/v6/printers.py
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@ -1425,6 +1425,20 @@ class StdPairPrinter:
def to_string(self):
return None
class StdCmpCatPrinter:
"Print a comparison category object"
def __init__ (self, typename, val):
self.typename = typename[typename.rfind(':')+1:]
self.val = val['_M_value']
def to_string (self):
if self.typename == 'strong_ordering' and self.val == 0:
name = 'equal'
else:
names = {-127:'unordered', -1:'less', 0:'equivalent', 1:'greater'}
name = names[int(self.val)]
return 'std::{}::{}'.format(self.typename, name)
# A "regular expression" printer which conforms to the
# "SubPrettyPrinter" protocol from gdb.printing.
@ -1928,6 +1942,11 @@ def build_libstdcxx_dictionary ():
libstdcxx_printer.add_version('std::',
'_Node_handle', StdNodeHandlePrinter)
# C++20 components
libstdcxx_printer.add_version('std::', 'partial_ordering', StdCmpCatPrinter)
libstdcxx_printer.add_version('std::', 'weak_ordering', StdCmpCatPrinter)
libstdcxx_printer.add_version('std::', 'strong_ordering', StdCmpCatPrinter)
# Extensions.
libstdcxx_printer.add_version('__gnu_cxx::', 'slist', StdSlistPrinter)

61
libstdc++-v3/testsuite/libstdc++-prettyprinters/cxx20.cc Normal file
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@ -0,0 +1,61 @@
// { dg-options "-g -O0 -std=gnu++2a" }
// { dg-do run { target c++2a } }
// Copyright (C) 2014-2019 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/>.
#include <compare>
#include <iostream>
struct X
{
int i;
std::weak_ordering operator<=>(X x) const noexcept { return i <=> x.i; }
};
int
main()
{
auto c1 = 1 <=> 1;
// { dg-final { note-test c1 "std::strong_ordering::equal" } }
auto c2 = 1 <=> 2;
// { dg-final { note-test c2 "std::strong_ordering::less" } }
auto c3 = 4 <=> 3;
// { dg-final { note-test c3 "std::strong_ordering::greater" } }
auto c4 = X{1} <=> X{1};
// { dg-final { note-test c4 "std::weak_ordering::equivalent" } }
auto c5 = X{2} <=> X{3};
// { dg-final { note-test c5 "std::weak_ordering::less" } }
auto c6 = X{2} <=> X{1};
// { dg-final { note-test c6 "std::weak_ordering::greater" } }
auto c7 = 0.2 <=> 0.2;
// { dg-final { note-test c7 "std::partial_ordering::equivalent" } }
auto c8 = 2.5 <=> 5.5;
// { dg-final { note-test c8 "std::partial_ordering::less" } }
auto c9 = 7.5 <=> -2.2;
// { dg-final { note-test c9 "std::partial_ordering::greater" } }
auto c10 = 0.0 <=> __builtin_nan("");
// { dg-final { note-test c10 "std::partial_ordering::unordered" } }
std::cout << "\n";
return 0; // Mark SPOT
}
// { dg-final { gdb-test SPOT } }