From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp101.ord1d.emailsrvr.com (smtp101.ord1d.emailsrvr.com [184.106.54.101]) by sourceware.org (Postfix) with ESMTPS id E327038582A7 for ; Tue, 2 Aug 2022 18:36:15 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org E327038582A7 X-Auth-ID: tom@honermann.net Received: by smtp13.relay.ord1d.emailsrvr.com (Authenticated sender: tom-AT-honermann.net) with ESMTPSA id 79444C01A0; Tue, 2 Aug 2022 14:36:14 -0400 (EDT) From: Tom Honermann To: gcc-patches@gcc.gnu.org Subject: [PATCH v4 2/2] preprocessor/106426: Treat u8 character literals as unsigned in char8_t modes. Date: Tue, 2 Aug 2022 14:36:02 -0400 Message-Id: <20220802183602.1575950-3-tom@honermann.net> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220802183602.1575950-1-tom@honermann.net> References: <20220802183602.1575950-1-tom@honermann.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Classification-ID: 1c8dd2ad-b7d1-42b3-917d-b50ffbed0e63-3-1 X-Spam-Status: No, score=-11.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Aug 2022 18:36:17 -0000 This patch corrects handling of UTF-8 character literals in preprocessing directives so that they are treated as unsigned types in char8_t enabled C++ modes (C++17 with -fchar8_t or C++20 without -fno-char8_t). Previously, UTF-8 character literals were always treated as having the same type as ordinary character literals (signed or unsigned dependent on target or use of the -fsigned-char or -funsigned char options). PR preprocessor/106426 gcc/c-family/ChangeLog: * c-opts.cc (c_common_post_options): Assign cpp_opts->unsigned_utf8char subject to -fchar8_t, -fsigned-char, and/or -funsigned-char. gcc/testsuite/ChangeLog: * g++.dg/ext/char8_t-char-literal-1.C: Check signedness of u8 literals. * g++.dg/ext/char8_t-char-literal-2.C: Check signedness of u8 literals. libcpp/ChangeLog: * charset.cc (narrow_str_to_charconst): Set signedness of CPP_UTF8CHAR literals based on unsigned_utf8char. * include/cpplib.h (cpp_options): Add unsigned_utf8char. * init.cc (cpp_create_reader): Initialize unsigned_utf8char. --- gcc/c-family/c-opts.cc | 1 + gcc/testsuite/g++.dg/ext/char8_t-char-literal-1.C | 6 +++++- gcc/testsuite/g++.dg/ext/char8_t-char-literal-2.C | 4 ++++ libcpp/charset.cc | 4 ++-- libcpp/include/cpplib.h | 4 ++-- libcpp/init.cc | 1 + 6 files changed, 15 insertions(+), 5 deletions(-) diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc index 108adc5caf8..02ce1e86cdb 100644 --- a/gcc/c-family/c-opts.cc +++ b/gcc/c-family/c-opts.cc @@ -1062,6 +1062,7 @@ c_common_post_options (const char **pfilename) /* char8_t support is implicitly enabled in C++20 and C2X. */ if (flag_char8_t == -1) flag_char8_t = (cxx_dialect >= cxx20) || flag_isoc2x; + cpp_opts->unsigned_utf8char = flag_char8_t ? 1 : cpp_opts->unsigned_char; if (flag_extern_tls_init) { diff --git a/gcc/testsuite/g++.dg/ext/char8_t-char-literal-1.C b/gcc/testsuite/g++.dg/ext/char8_t-char-literal-1.C index 8ed85ccfdcd..2994dd38516 100644 --- a/gcc/testsuite/g++.dg/ext/char8_t-char-literal-1.C +++ b/gcc/testsuite/g++.dg/ext/char8_t-char-literal-1.C @@ -1,6 +1,6 @@ // Test that UTF-8 character literals have type char if -fchar8_t is not enabled. // { dg-do compile } -// { dg-options "-std=c++17 -fno-char8_t" } +// { dg-options "-std=c++17 -fsigned-char -fno-char8_t" } template struct is_same @@ -10,3 +10,7 @@ template { static const bool value = true; }; static_assert(is_same::value, "Error"); + +#if u8'\0' - 1 > 0 +#error "UTF-8 character literals not signed in preprocessor" +#endif diff --git a/gcc/testsuite/g++.dg/ext/char8_t-char-literal-2.C b/gcc/testsuite/g++.dg/ext/char8_t-char-literal-2.C index 7861736689c..db4fe70046d 100644 --- a/gcc/testsuite/g++.dg/ext/char8_t-char-literal-2.C +++ b/gcc/testsuite/g++.dg/ext/char8_t-char-literal-2.C @@ -10,3 +10,7 @@ template { static const bool value = true; }; static_assert(is_same::value, "Error"); + +#if u8'\0' - 1 < 0 +#error "UTF-8 character literals not unsigned in preprocessor" +#endif diff --git a/libcpp/charset.cc b/libcpp/charset.cc index ca8b7cf7aa5..12e31632228 100644 --- a/libcpp/charset.cc +++ b/libcpp/charset.cc @@ -1960,8 +1960,8 @@ narrow_str_to_charconst (cpp_reader *pfile, cpp_string str, /* Multichar constants are of type int and therefore signed. */ if (i > 1) unsigned_p = 0; - else if (type == CPP_UTF8CHAR && !CPP_OPTION (pfile, cplusplus)) - unsigned_p = 1; + else if (type == CPP_UTF8CHAR) + unsigned_p = CPP_OPTION (pfile, unsigned_utf8char); else unsigned_p = CPP_OPTION (pfile, unsigned_char); diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h index 3eba6f74b57..f9c042db034 100644 --- a/libcpp/include/cpplib.h +++ b/libcpp/include/cpplib.h @@ -581,8 +581,8 @@ struct cpp_options ints and target wide characters, respectively. */ size_t precision, char_precision, int_precision, wchar_precision; - /* True means chars (wide chars) are unsigned. */ - bool unsigned_char, unsigned_wchar; + /* True means chars (wide chars, UTF-8 chars) are unsigned. */ + bool unsigned_char, unsigned_wchar, unsigned_utf8char; /* True if the most significant byte in a word has the lowest address in memory. */ diff --git a/libcpp/init.cc b/libcpp/init.cc index f4ab83d2145..0242da5f55c 100644 --- a/libcpp/init.cc +++ b/libcpp/init.cc @@ -231,6 +231,7 @@ cpp_create_reader (enum c_lang lang, cpp_hash_table *table, CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int); CPP_OPTION (pfile, unsigned_char) = 0; CPP_OPTION (pfile, unsigned_wchar) = 1; + CPP_OPTION (pfile, unsigned_utf8char) = 1; CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */ /* Default to no charset conversion. */ -- 2.32.0