[PATCH v2 06/18] Add quick_symbol_functions::compute_main_name

[Tom Tromey <tom@tromey.com>]

This adds a new compute_main_name method to quick_symbol_functions.
Currently there are no implementations of this, but a subsequent patch
will add one.
---
 gdb/objfiles.h      |  3 +++
 gdb/quick-symbol.h  |  9 +++++++++
 gdb/symfile-debug.c | 12 ++++++++++++
 gdb/symtab.c        |  2 ++
 4 files changed, 26 insertions(+)

diff --git a/gdb/objfiles.h b/gdb/objfiles.h
index 4b8aa9bfcec..c0ca9de6874 100644
--- a/gdb/objfiles.h
+++ b/gdb/objfiles.h
@@ -601,6 +601,9 @@ struct objfile
   void map_symbol_filenames (gdb::function_view<symbol_filename_ftype> fun,
 			     bool need_fullname);
 
+  /* See quick_symbol_functions.  */
+  void compute_main_name ();
+
   /* See quick_symbol_functions.  */
   struct compunit_symtab *find_compunit_symtab_by_address (CORE_ADDR address);
 
diff --git a/gdb/quick-symbol.h b/gdb/quick-symbol.h
index a7fea2ccb49..49505aef64a 100644
--- a/gdb/quick-symbol.h
+++ b/gdb/quick-symbol.h
@@ -212,6 +212,15 @@ struct quick_symbol_functions
 	gdb::function_view<symbol_filename_ftype> fun,
 	bool need_fullname) = 0;
 
+  /* Compute the name and language of the main function for the given
+     objfile.  Normally this is done during symbol reading, but this
+     method exists in case this work is done in a worker thread and
+     must be waited for.  The implementation can call
+     set_objfile_main_name if results are found.  */
+  virtual void compute_main_name (struct objfile *objfile)
+  {
+  }
+
   /* Return true if this class can lazily read the symbols.  This may
      only return true if there are in fact symbols to be read, because
      this is used in the implementation of 'has_partial_symbols'.  */
diff --git a/gdb/symfile-debug.c b/gdb/symfile-debug.c
index 850da4147a3..4b27d9eb406 100644
--- a/gdb/symfile-debug.c
+++ b/gdb/symfile-debug.c
@@ -483,6 +483,18 @@ objfile::map_symbol_filenames (gdb::function_view<symbol_filename_ftype> fun,
     iter->map_symbol_filenames (this, fun, need_fullname);
 }
 
+void
+objfile::compute_main_name ()
+{
+  if (debug_symfile)
+    gdb_printf (gdb_stdlog,
+		"qf->compute_main_name (%s)\n",
+		objfile_debug_name (this));
+
+  for (const auto &iter : qf_require_partial_symbols ())
+    iter->compute_main_name (this);
+}
+
 struct compunit_symtab *
 objfile::find_compunit_symtab_by_address (CORE_ADDR address)
 {
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 5ec56f4f2af..ea003a4d4c9 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -6237,6 +6237,8 @@ find_main_name (void)
      accurate.  */
   for (objfile *objfile : current_program_space->objfiles ())
     {
+      objfile->compute_main_name ();
+
       if (objfile->per_bfd->name_of_main != NULL)
 	{
 	  set_main_name (pspace,

-- 
2.41.0