ff9baa5f1c
The DWARF back-end used to systematically ignore file-scope function and
variable declarations. While this is justified in language like C/C++,
where such declarations can appear in several translation units and thus
bloat uselessly the debug info, this behavior is counter-productive in
languages with a well-defined module system. Specifically, it prevents
the description of imported entities, that belong to foreign languages,
making them unavailable from debuggers.
Take for instance:
package C_Binding is
function My_C_Function (I : Integer) return Integer;
pragma Import (C, My_C_Function, "my_c_function");
end C_Binding;
This makes available for Ada programs the C function "my_c_function"
under the following name: C_Binding.My_C_Function. When GCC compiles
it, though, it is represented as a FUNCTION_DECL node with DECL_EXTERNAL
set and a null DECL_INITIAL, which used to be discarded unconditionally
in the DWARF back-end.
This patch moves such filter from the DWARF back-end to the relevant
callers: passes.c:rest_of_decl_compilation and
godump.c:go_early_global_decl. It also This patch also updates the Ada
front-end to call debug hooks for functions such as in the above
example, so that we do generate debugging information for them.
gcc/
* dwarf2out.c (gen_decl_die): Remove the guard to skip file-scope
FUNCTION_DECL declarations.
(dwarf2out_early_global_decl): Remove the guard to skip FUNCTION_DECL
declarations.
(dwaf2out_decl): Likewise.
* godump.c (go_early_global_decl): Skip call to the real debug hook
for FUNCTION_DECL declarations.
* passes.c (rest_of_decl_compilation): Skip call to the
early_global_decl debug hook for FUNCTION_DECL declarations, unless
-fdump-go-spec is passed.
gcc/ada/
* gcc-interface/ada-tree.h (DECL_FUNCTION_IS_DEF): Update copyright
notice. New macro.
* gcc-interface/trans.c (Subprogram_Body_to_gnu): Tag the subprogram
as a definition.
(Compilation_Unit_to_gnu): Tag the elaboration procedure as a
definition.
* gcc-interface/decl.c (gnat_to_gnu_entity): Tag declarations of
imported subprograms for the current compilation unit as
definitions. Disable debug info for references to variables.
* gcc-interface/gigi.h (create_subprog_decl): Update declaration.
* gcc-interface/utils.c (gnat_pushdecl): Add external DECLs that are
not built-in functions to their binding scope.
(create_subprog_decl): Add a DEFINITION parameter. If it is true, tag
the function as a definition. Update all callers.
(gnat_write_global_declarations): Emit debug info for imported
functions. Filter out external variables for which debug info
is disabled.
gcc/testsuite/
* gnat.dg/debug11_pkg.adb, gnat.dg/debug11_pkg.ads,
gnat.dg/debug11_pkg2.ads: New testcase.
From-SVN: r249449
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcilkrts | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libmpx | ||
| libobjc | ||
| liboffloadmic | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| 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 | ||
| README | ||
| symlink-tree | ||
| 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.