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Deferred macros are needed for C++ modules. Header units may export macro definitions and undefinitions. These are resolved lazily at the point of (potential) use. (The language specifies that, it's not just a useful optimization.) Thus, identifier nodes grow a 'deferred' field, which fortunately doesn't expand the structure on 64-bit systems as there was padding there. This is non-zero on NT_MACRO nodes, if the macro is deferred. When such an identifier is lexed, it is resolved via a callback that I added recently. That will either provide the macro definition, or discover it there was an overriding undef. Either way the identifier is no longer a deferred macro. Notice it is now possible for NT_MACRO nodes to have a NULL macro expansion. libcpp/ * include/cpplib.h (struct cpp_hashnode): Add deferred field. (cpp_set_deferred_macro): Define. (cpp_get_deferred_macro): Declare. (cpp_macro_definition): Reformat, add overload. (cpp_macro_definition_location): Deal with deferred macro. (cpp_alloc_token_string, cpp_compare_macro): Declare. * internal.h (_cpp_notify_macro_use): Return bool (_cpp_maybe_notify_macro_use): Likewise. * directives.c (do_undef): Check macro is not undef before warning. (do_ifdef, do_ifndef): Deal with deferred macro. * expr.c (parse_defined): Likewise. * lex.c (cpp_allocate_token_string): Break out of ... (create_literal): ... here. Call it. (cpp_maybe_module_directive): Deal with deferred macro. * macro.c (cpp_get_token_1): Deal with deferred macro. (warn_of_redefinition): Deal with deferred macro. (compare_macros): Rename to ... (cpp_compare_macro): ... here. Make extern. (cpp_get_deferred_macro): New. (_cpp_notify_macro_use): Deal with deferred macro, return bool indicating definedness. (cpp_macro_definition): Deal with deferred macro. |
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| 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 | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| lt~obsolete.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.