[Bug symtab/30996] New: [gdb/symtab, gdb-index] Write name_of_main/language_of_main into .gdb_index in more cases

[Bug symtab/30996] New: [gdb/symtab, gdb-index] Write name_of_main/language_of_main into .gdb_index in more cases

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30996

            Bug ID: 30996
           Summary: [gdb/symtab, gdb-index] Write
                    name_of_main/language_of_main into .gdb_index in more
                    cases
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

[ Reported here:
https://sourceware.org/pipermail/gdb-patches/2023-October/203488.html ]

The v9 .gdb_index contains a shortcut table, but it doesn't always contain
information.

For instance, this is the case for C and C++ programs.

Making this information available in more cases will speed up gdb startup if 
finding the language of main requires expanding a large CU.

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[Bug symtab/30996] [gdb/symtab, gdb-index] Write name_of_main/language_of_main into .gdb_index in more cases

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30996

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
This may be easier once bug#30174 is done.

Many languages use minsyms here, which is fast.
The danger would be to have a scenario where
the DWARF reader picks "main", but in reality
gdb should choose some other language (e.g, Ada).

But maybe we can special-case "main" in the main-finding
function.

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[Bug symtab/30996] [gdb/symtab, gdb-index] Write name_of_main/language_of_main into .gdb_index in more cases

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30996

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> Making this information available in more cases will speed up gdb startup if
> finding the language of main requires expanding a large CU.

FWIW, implementing lazy expansion ( PR29398 ) might also address this problem
sufficiently.

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[Bug symtab/30996] [gdb/symtab, gdb-index] Write name_of_main/language_of_main into .gdb_index in more cases

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30996

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sam at gentoo dot org

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