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[96.67.140.173]) by smtp.gmail.com with ESMTPSA id o7-20020a05620a2a0700b007810a3294cfsm610887qkp.40.2023.12.21.04.37.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Dec 2023 04:37:53 -0800 (PST) From: Lewis Hyatt To: gcc-patches@gcc.gnu.org Cc: Lewis Hyatt Subject: [PATCH] libcpp: Fix __has_include_next ICE in the last directory of the path [PR80755] Date: Thu, 21 Dec 2023 07:37:50 -0500 Message-Id: <20231221123750.2303405-1-lhyatt@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-3038.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE 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: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785895112158978046 X-GMAIL-MSGID: 1785895112158978046 Hello- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80755 Here is a short fix for the ICE in libcpp noted in the PR. Bootstrap + regtest all languages on x86-64 Linux. Is it OK please? Thanks! -Lewis -- >8 -- In libcpp/files.cc, the function _cpp_has_header(), which implements __has_include and __has_include_next, does not check for a NULL return value from search_path_head(), leading to an ICE tripping an assert when _cpp_find_file() tries to use it. Fix it by checking for that case and silently returning false instead. As suggested by the PR author, it is easiest to make a testcase by using the -idirafter option. To enable that, also modify the dg-additional-options testsuite procedure to make the global $srcdir available, since -idirafter requires the full path. libcpp/ChangeLog: PR preprocessor/80755 * files.cc (search_path_head): Add SUPPRESS_DIAGNOSTIC argument defaulting to false. (_cpp_has_header): Silently return false if the search path has been exhausted, rather than issuing a diagnostic and then hitting an assert. gcc/testsuite/ChangeLog: * lib/gcc-defs.exp (dg-additional-options): Make $srcdir usable in a dg-additional-options directive. * c-c++-common/cpp/has-include-next-2-dir/has-include-next-2.h: New test. * c-c++-common/cpp/has-include-next-2.c: New test. --- libcpp/files.cc | 12 ++++++++---- .../cpp/has-include-next-2-dir/has-include-next-2.h | 3 +++ gcc/testsuite/c-c++-common/cpp/has-include-next-2.c | 4 ++++ gcc/testsuite/lib/gcc-defs.exp | 1 + 4 files changed, 16 insertions(+), 4 deletions(-) create mode 100644 gcc/testsuite/c-c++-common/cpp/has-include-next-2-dir/has-include-next-2.h create mode 100644 gcc/testsuite/c-c++-common/cpp/has-include-next-2.c diff --git a/libcpp/files.cc b/libcpp/files.cc index 27301d79fa4..aaab4b13a6a 100644 --- a/libcpp/files.cc +++ b/libcpp/files.cc @@ -181,7 +181,8 @@ static bool read_file_guts (cpp_reader *pfile, _cpp_file *file, static bool read_file (cpp_reader *pfile, _cpp_file *file, location_t loc); static struct cpp_dir *search_path_head (cpp_reader *, const char *fname, - int angle_brackets, enum include_type); + int angle_brackets, enum include_type, + bool suppress_diagnostic = false); static const char *dir_name_of_file (_cpp_file *file); static void open_file_failed (cpp_reader *pfile, _cpp_file *file, int, location_t); @@ -1041,7 +1042,7 @@ _cpp_mark_file_once_only (cpp_reader *pfile, _cpp_file *file) nothing left in the path, returns NULL. */ static struct cpp_dir * search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets, - enum include_type type) + enum include_type type, bool suppress_diagnostic) { cpp_dir *dir; _cpp_file *file; @@ -1070,7 +1071,7 @@ search_path_head (cpp_reader *pfile, const char *fname, int angle_brackets, return make_cpp_dir (pfile, dir_name_of_file (file), pfile->buffer ? pfile->buffer->sysp : 0); - if (dir == NULL) + if (dir == NULL && !suppress_diagnostic) cpp_error (pfile, CPP_DL_ERROR, "no include path in which to search for %s", fname); @@ -2164,7 +2165,10 @@ bool _cpp_has_header (cpp_reader *pfile, const char *fname, int angle_brackets, enum include_type type) { - cpp_dir *start_dir = search_path_head (pfile, fname, angle_brackets, type); + cpp_dir *start_dir = search_path_head (pfile, fname, angle_brackets, type, + /* suppress_diagnostic = */ true); + if (!start_dir) + return false; _cpp_file *file = _cpp_find_file (pfile, fname, start_dir, angle_brackets, _cpp_FFK_HAS_INCLUDE, 0); return file->err_no != ENOENT; diff --git a/gcc/testsuite/c-c++-common/cpp/has-include-next-2-dir/has-include-next-2.h b/gcc/testsuite/c-c++-common/cpp/has-include-next-2-dir/has-include-next-2.h new file mode 100644 index 00000000000..1e4be6ce7a3 --- /dev/null +++ b/gcc/testsuite/c-c++-common/cpp/has-include-next-2-dir/has-include-next-2.h @@ -0,0 +1,3 @@ +#if __has_include_next() +/* This formerly led to an ICE when the current directory was the last one in the path. */ +#endif diff --git a/gcc/testsuite/c-c++-common/cpp/has-include-next-2.c b/gcc/testsuite/c-c++-common/cpp/has-include-next-2.c new file mode 100644 index 00000000000..4928d3e992c --- /dev/null +++ b/gcc/testsuite/c-c++-common/cpp/has-include-next-2.c @@ -0,0 +1,4 @@ +/* PR preprocessor/80755 */ +/* { dg-do preprocess } */ +/* { dg-additional-options "-idirafter $srcdir/c-c++-common/cpp/has-include-next-2-dir" } */ +#include diff --git a/gcc/testsuite/lib/gcc-defs.exp b/gcc/testsuite/lib/gcc-defs.exp index fc569c18ad5..091520ff69e 100644 --- a/gcc/testsuite/lib/gcc-defs.exp +++ b/gcc/testsuite/lib/gcc-defs.exp @@ -280,6 +280,7 @@ if { [info exists env(GCC_RUNTEST_PARALLELIZE_DIR)] \ proc dg-additional-options { args } { upvar dg-extra-tool-flags extra-tool-flags + global srcdir if { [llength $args] > 3 } { error "[lindex $args 0]: too many arguments"