[PATCH] [C++/DWARF] Add 'using' support - take 4

[Devang Patel <dpatel at apple dot com>]

[Ref http://gcc.gnu.org/ml/gcc-patches/2004-01/msg02516.html ]

Bootstrapped and tested on i686-pc-linux-gnu
These three test suite runs do not reveal any new regression:
- gcc test suite
- libstdc++ test suite
- gdb test suite using carlton_dictionary-branch

ChangeLog is same as previous.

OK for mainline?
Thank you,
-
Devang


2003-01-26  Devang Patel  <dpatel@apple.com>

        * Makefile.in (dwarf2out.o): Depend on input.h
        * dbxout.c (dbx_debug_hooks): Add new empty hook for
        imported_module_or_decl.
        (xcoff_debug_hooks): Same.
        * sdbout.c (sdb_debug_hooks): Same.
        * vmsdbgout.c (vmsdbg_debug_hooks): Same.
        * debug.c (do_nothing_debug_hooks): Same.
        (debug_nothing_tree_tree_enum): New function.
        * debug.h (gcc_debug_hooks): New hook, imported_module_or_decl.
        (dbg_module_or_decl): New enum.
        * dwarf2out.c: Include input.h.
        (dwarf2_debug_hooks): Add new hook for imported_module_or_decl.
        (remove_child_TAG): New function.
        (dwarf_tag_name): Handle DW_TAG_imported_module.
        (gen_subprogram_die): Equate decl number to declaration die. Do 
not
        remove all children dies while reusing declaration die for 
definition.
        Instead, selectively remove only formal parameters.
        (gen_variable_die): Equate variable decl to declaration die.
        (gen_field_die): Equate field decl to line number.
        (force_namespace_die): Replace it with ...
        (force_decl_die): ... this.
        (force_type_die): New function.
        (setup_namespace_context): Replace use of force_namespace_die() 
with
        force_decl_die().
        (gen_namespace_die): Same.
        (dwarf2out_imported_module_or_decl): New function.

        testsuite:

        g++.dg/debug/namespace1.C: New test.

        cp:

        * name-lookup.c: Include "debug.h"
        (do_namespace_alias): Invoke debug_hooks to emit debug info
        for namespace alias.
        (do_local_using_decl): Invoke debug_hooks to emit debug info
        for using decl.
        (do_class_using_decl): Same.
        (do_toplevel_using_decl): Same.
        (do_using_directive): Same.
        (cp_emit_debug_info_for_using): New function.
        * Make-lang.in (cp/parser.o): Depend on debug.h
        (cp/name-lookup.o): Same.

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