93313b94fe
As part of adding [[]]-style attributes, C2x adds the token :: for use in scoped attribute names. This patch adds corresponding support for that token in C to GCC. The token is supported both for C2x and for older gnu* standards (on the basis that extensions are normally supported in older gnu* versions; people will expect to be able to use [[]] attributes, before C2x is the default, without needing to use -std=gnu2x). There are no cases in older C standards where the token : can be followed by a token starting with : in syntactically valid sources; the only cases the :: token could break in older standard C thus are ones involving concatenation of pp-tokens where the result does not end up as tokens (e.g., gets stringized). In GNU C extensions, the main case where :: might appear in existing sources is in asm statements, and the C parser is thus made to handle it like two consecutive : tokens, which the C++ parser already does. A limited test of various positionings of :: in asm statements is added to the testsuite (in particular, to cover the syntax error when :: means too many colons but a single : would be OK), but existing tests cover a variety of styles there anyway. Technically there are cases in Objective-C and OpenMP for which this also changes how previously valid code is lexed: the objc-selector-arg syntax allows multiple consecutive : tokens (although I don't think they are particularly useful there), while OpenMP syntax includes array section syntax such as [:] which, before :: was a token, could also be written as [::> (there might be other OpenMP cases potentially affected, I didn't check all the OpenMP syntax in detail). I don't think either of those cases affects the basis for supporting the :: token in all -std=gnu* modes, or that there is any obvious need to special-case handling of CPP_SCOPE tokens for those constructs the way there is for asm statements. cpp_avoid_paste, which determines when spaces need adding between tokens in preprocessed output where there wouldn't otherwise be whitespace between them (e.g. if stringized), already inserts space between : and : unconditionally, rather than only for C++, so no change is needed there (but a C2x test is added that such space is indeed inserted). Bootstrapped with no regressions on x86-64-pc-linux-gnu. gcc/c: * c-parser.c (c_parser_asm_statement): Handle CPP_SCOPE like two CPP_COLON tokens. gcc/testsuite: * gcc.dg/asm-scope-1.c, gcc.dg/cpp/c11-scope-1.c, gcc.dg/cpp/c17-scope-1.c, gcc.dg/cpp/c2x-scope-1.c, gcc.dg/cpp/c2x-scope-2.c, gcc.dg/cpp/c90-scope-1.c, gcc.dg/cpp/c94-scope-1.c, gcc.dg/cpp/c99-scope-1.c, gcc.dg/cpp/gnu11-scope-1.c, gcc.dg/cpp/gnu17-scope-1.c, gcc.dg/cpp/gnu89-scope-1.c, gcc.dg/cpp/gnu99-scope-1.c: New tests. libcpp: * include/cpplib.h (struct cpp_options): Add member scope. * init.c (struct lang_flags, lang_defaults): Likewise. (cpp_set_lang): Set scope member of pfile. * lex.c (_cpp_lex_direct): Test CPP_OPTION (pfile, scope) not CPP_OPTION (pfile, cplusplus) for creating CPP_SCOPE tokens. From-SVN: r276434 |
||
|---|---|---|
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
| liboffloadmic | ||
| libphobos | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| ar-lib | ||
| ChangeLog | ||
| ChangeLog.jit | ||
| ChangeLog.tree-ssa | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| lt~obsolete.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
| Makefile.tpl | ||
| missing | ||
| mkdep | ||
| mkinstalldirs | ||
| move-if-change | ||
| multilib.am | ||
| README | ||
| symlink-tree | ||
| test-driver | ||
| ylwrap | ||
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.