Move sym_fns::qf to objfile

Currently the "partial" symbol reader is attached to the objfile's
symbol functions.  However, in order to allow multiple separate
partial symbol readers, this association must be changed.  This patch
moves the "qf" member out of sym_fns as a step toward that goal.

gdb/ChangeLog
2021-03-20  Tom Tromey  <tom@tromey.com>

	* psymtab.c (require_partial_symbols): Check that 'sf' is not
	null.
	* xcoffread.c (xcoff_sym_fns): Update.
	* symfile.h (struct sym_fns) <qf>: Remove.
	* symfile.c (syms_from_objfile_1, reread_symbols): Update.
	* symfile-debug.c (objfile::has_partial_symbols)
	(objfile::find_last_source_symtab)
	(objfile::forget_cached_source_info)
	(objfile::map_symtabs_matching_filename, objfile::lookup_symbol)
	(objfile::print_stats, objfile::dump)
	(objfile::expand_symtabs_for_function)
	(objfile::expand_all_symtabs)
	(objfile::expand_symtabs_with_fullname)
	(objfile::map_matching_symbols)
	(objfile::expand_symtabs_matching)
	(objfile::find_pc_sect_compunit_symtab)
	(objfile::map_symbol_filenames)
	(objfile::find_compunit_symtab_by_address)
	(objfile::lookup_global_symbol_language, debug_sym_fns)
	(install_symfile_debug_logging): Update.
	* objfiles.h (struct objfile) <qf>: New member.
	* mipsread.c (ecoff_sym_fns): Update.
	* machoread.c (macho_sym_fns): Update.
	* elfread.c (elf_sym_fns_gdb_index, elf_sym_fns_debug_names):
	Don't declare.
	(elf_symfile_read, elf_sym_fns, elf_sym_fns_lazy_psyms): Update.
	* dbxread.c (aout_sym_fns): Update.
	* coffread.c (coff_sym_fns): Update.

12 files changed, 77 insertions, 89 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 82a82c9..55487d4 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,36 @@
 2021-03-20  Tom Tromey  <tom@tromey.com>
 
+	* psymtab.c (require_partial_symbols): Check that 'sf' is not
+	null.
+	* xcoffread.c (xcoff_sym_fns): Update.
+	* symfile.h (struct sym_fns) <qf>: Remove.
+	* symfile.c (syms_from_objfile_1, reread_symbols): Update.
+	* symfile-debug.c (objfile::has_partial_symbols)
+	(objfile::find_last_source_symtab)
+	(objfile::forget_cached_source_info)
+	(objfile::map_symtabs_matching_filename, objfile::lookup_symbol)
+	(objfile::print_stats, objfile::dump)
+	(objfile::expand_symtabs_for_function)
+	(objfile::expand_all_symtabs)
+	(objfile::expand_symtabs_with_fullname)
+	(objfile::map_matching_symbols)
+	(objfile::expand_symtabs_matching)
+	(objfile::find_pc_sect_compunit_symtab)
+	(objfile::map_symbol_filenames)
+	(objfile::find_compunit_symtab_by_address)
+	(objfile::lookup_global_symbol_language, debug_sym_fns)
+	(install_symfile_debug_logging): Update.
+	* objfiles.h (struct objfile) <qf>: New member.
+	* mipsread.c (ecoff_sym_fns): Update.
+	* machoread.c (macho_sym_fns): Update.
+	* elfread.c (elf_sym_fns_gdb_index, elf_sym_fns_debug_names):
+	Don't declare.
+	(elf_symfile_read, elf_sym_fns, elf_sym_fns_lazy_psyms): Update.
+	* dbxread.c (aout_sym_fns): Update.
+	* coffread.c (coff_sym_fns): Update.
+
+2021-03-20  Tom Tromey  <tom@tromey.com>
+
 	* symfile.h (symbol_compare_ftype, symbol_filename_ftype)
 	(expand_symtabs_file_matcher_ftype)
 	(expand_symtabs_symbol_matcher_ftype)
diff --git a/gdb/coffread.c b/gdb/coffread.c
index badcb5a..676deec 100644
--- a/gdb/coffread.c
+++ b/gdb/coffread.c
@@ -2180,7 +2180,6 @@ static const struct sym_fns coff_sym_fns =
   default_symfile_relocate,	/* sym_relocate: Relocate a debug
 				   section.  */
   NULL,				/* sym_probe_fns */
-  &psym_functions
 };
 
 void _initialize_coffread ();
diff --git a/gdb/dbxread.c b/gdb/dbxread.c
index 6450cd3..9003822 100644
--- a/gdb/dbxread.c
+++ b/gdb/dbxread.c
@@ -3130,7 +3130,6 @@ static const struct sym_fns aout_sym_fns =
   NULL,
   default_symfile_relocate,	/* Relocate a debug section.  */
   NULL,				/* sym_probe_fns */
-  &psym_functions
 };
 
 void _initialize_dbxread ();
diff --git a/gdb/elfread.c b/gdb/elfread.c
index 439f5cc..3ba7221 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -54,8 +54,6 @@
 #include "dwarf2/public.h"
 
 /* Forward declarations.  */
-extern const struct sym_fns elf_sym_fns_gdb_index;
-extern const struct sym_fns elf_sym_fns_debug_names;
 extern const struct sym_fns elf_sym_fns_lazy_psyms;
 
 /* The struct elfinfo is available only during ELF symbol table and
@@ -1272,10 +1270,10 @@ elf_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
 	  switch (index_kind)
 	    {
 	    case dw_index_kind::GDB_INDEX:
-	      objfile_set_sym_fns (objfile, &elf_sym_fns_gdb_index);
+	      objfile->qf = &dwarf2_gdb_index_functions;
 	      break;
 	    case dw_index_kind::DEBUG_NAMES:
-	      objfile_set_sym_fns (objfile, &elf_sym_fns_debug_names);
+	      objfile->qf = &dwarf2_debug_names_functions;
 	      break;
 	    }
 	}
@@ -1437,7 +1435,6 @@ static const struct sym_fns elf_sym_fns =
   NULL,
   default_symfile_relocate,	/* Relocate a debug section.  */
   &elf_probe_fns,		/* sym_probe_fns */
-  &psym_functions
 };
 
 /* The same as elf_sym_fns, but not registered and lazily reads
@@ -1455,41 +1452,6 @@ const struct sym_fns elf_sym_fns_lazy_psyms =
   NULL,
   default_symfile_relocate,	/* Relocate a debug section.  */
   &elf_probe_fns,		/* sym_probe_fns */
-  &psym_functions
-};
-
-/* The same as elf_sym_fns, but not registered and uses the
-   DWARF-specific GNU index rather than psymtab.  */
-const struct sym_fns elf_sym_fns_gdb_index =
-{
-  elf_new_init,			/* init anything gbl to entire symab */
-  elf_symfile_init,		/* read initial info, setup for sym_red() */
-  elf_symfile_read,		/* read a symbol file into symtab */
-  NULL,				/* sym_read_psymbols */
-  elf_symfile_finish,		/* finished with file, cleanup */
-  default_symfile_offsets,	/* Translate ext. to int. relocation */
-  elf_symfile_segments,		/* Get segment information from a file.  */
-  NULL,
-  default_symfile_relocate,	/* Relocate a debug section.  */
-  &elf_probe_fns,		/* sym_probe_fns */
-  &dwarf2_gdb_index_functions
-};
-
-/* The same as elf_sym_fns, but not registered and uses the
-   DWARF-specific .debug_names index rather than psymtab.  */
-const struct sym_fns elf_sym_fns_debug_names =
-{
-  elf_new_init,			/* init anything gbl to entire symab */
-  elf_symfile_init,		/* read initial info, setup for sym_red() */
-  elf_symfile_read,		/* read a symbol file into symtab */
-  NULL,				/* sym_read_psymbols */
-  elf_symfile_finish,		/* finished with file, cleanup */
-  default_symfile_offsets,	/* Translate ext. to int. relocation */
-  elf_symfile_segments,		/* Get segment information from a file.  */
-  NULL,
-  default_symfile_relocate,	/* Relocate a debug section.  */
-  &elf_probe_fns,		/* sym_probe_fns */
-  &dwarf2_debug_names_functions
 };
 
 /* STT_GNU_IFUNC resolver vector to be installed to gnu_ifunc_fns_p.  */
diff --git a/gdb/machoread.c b/gdb/machoread.c
index ff50ae5..44baaa2 100644
--- a/gdb/machoread.c
+++ b/gdb/machoread.c
@@ -958,7 +958,6 @@ static const struct sym_fns macho_sym_fns = {
   NULL,
   macho_symfile_relocate,	/* Relocate a debug section.  */
   NULL,				/* sym_get_probes */
-  &psym_functions
 };
 
 void _initialize_machoread ();
diff --git a/gdb/mipsread.c b/gdb/mipsread.c
index 052b31c..3f0697b 100644
--- a/gdb/mipsread.c
+++ b/gdb/mipsread.c
@@ -376,7 +376,6 @@ static const struct sym_fns ecoff_sym_fns =
   NULL,
   default_symfile_relocate,	/* Relocate a debug section.  */
   NULL,				/* sym_probe_fns */
-  &psym_functions
 };
 
 void _initialize_mipsread ();
diff --git a/gdb/objfiles.h b/gdb/objfiles.h
index c55f0f1..8d4a23a 100644
--- a/gdb/objfiles.h
+++ b/gdb/objfiles.h
@@ -677,6 +677,10 @@ public:
 
   const struct sym_fns *sf = nullptr;
 
+  /* The "quick" (aka partial) symbol functions for this symbol
+     reader.  */
+  const struct quick_symbol_functions *qf = nullptr;
+
   /* Per objfile data-pointers required by other GDB modules.  */
 
   REGISTRY_FIELDS {};
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 94b5acd..8c02fa2 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -84,7 +84,8 @@ require_partial_symbols (struct objfile *objfile, bool verbose)
     {
       objfile->flags |= OBJF_PSYMTABS_READ;
 
-      if (objfile->sf->sym_read_psymbols)
+      if (objfile->sf != nullptr
+	  && objfile->sf->sym_read_psymbols)
 	{
 	  if (verbose)
 	    printf_filtered (_("Reading symbols from %s...\n"),
diff --git a/gdb/symfile-debug.c b/gdb/symfile-debug.c
index 419f24d..da3439d 100644
--- a/gdb/symfile-debug.c
+++ b/gdb/symfile-debug.c
@@ -84,8 +84,8 @@ objfile::has_partial_symbols ()
       && sf != nullptr
       && sf->sym_read_psymbols != NULL)
     retval = true;
-  else if (sf != nullptr)
-    retval = sf->qf->has_symbols (this);
+  else if (qf != nullptr)
+    retval = qf->has_symbols (this);
 
   if (debug_symfile)
     fprintf_filtered (gdb_stdlog, "qf->has_symbols (%s) = %d\n",
@@ -103,8 +103,8 @@ objfile::find_last_source_symtab ()
     fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (%s)\n",
 		      objfile_debug_name (this));
 
-  if (sf != nullptr)
-    retval = sf->qf->find_last_source_symtab (this);
+  if (qf != nullptr)
+    retval = qf->find_last_source_symtab (this);
 
   if (debug_symfile)
     fprintf_filtered (gdb_stdlog, "qf->find_last_source_symtab (...) = %s\n",
@@ -120,8 +120,8 @@ objfile::forget_cached_source_info ()
     fprintf_filtered (gdb_stdlog, "qf->forget_cached_source_info (%s)\n",
 		      objfile_debug_name (this));
 
-  if (sf != nullptr)
-    sf->qf->forget_cached_source_info (this);
+  if (qf != nullptr)
+    qf->forget_cached_source_info (this);
 }
 
 bool
@@ -138,8 +138,8 @@ objfile::map_symtabs_matching_filename
 		      host_address_to_string (&callback));
 
   bool retval = false;
-  if (sf != nullptr)
-    retval = (sf->qf->map_symtabs_matching_filename
+  if (qf != nullptr)
+    retval = (qf->map_symtabs_matching_filename
 	      (this, name, real_path, callback));
 
   if (debug_symfile)
@@ -161,8 +161,8 @@ objfile::lookup_symbol (block_enum kind, const char *name, domain_enum domain)
 		      objfile_debug_name (this), kind, name,
 		      domain_name (domain));
 
-  if (sf != nullptr)
-    retval = sf->qf->lookup_symbol (this, kind, name, domain);
+  if (qf != nullptr)
+    retval = qf->lookup_symbol (this, kind, name, domain);
 
   if (debug_symfile)
     fprintf_filtered (gdb_stdlog, "qf->lookup_symbol (...) = %s\n",
@@ -180,8 +180,8 @@ objfile::print_stats ()
     fprintf_filtered (gdb_stdlog, "qf->print_stats (%s)\n",
 		      objfile_debug_name (this));
 
-  if (sf != nullptr)
-    sf->qf->print_stats (this);
+  if (qf != nullptr)
+    qf->print_stats (this);
 }
 
 void
@@ -191,8 +191,8 @@ objfile::dump ()
     fprintf_filtered (gdb_stdlog, "qf->dump (%s)\n",
 		      objfile_debug_name (this));
 
-  if (sf != nullptr)
-    sf->qf->dump (this);
+  if (qf != nullptr)
+    qf->dump (this);
 }
 
 void
@@ -203,8 +203,8 @@ objfile::expand_symtabs_for_function (const char *func_name)
 		      "qf->expand_symtabs_for_function (%s, \"%s\")\n",
 		      objfile_debug_name (this), func_name);
 
-  if (sf != nullptr)
-    sf->qf->expand_symtabs_for_function (this, func_name);
+  if (qf != nullptr)
+    qf->expand_symtabs_for_function (this, func_name);
 }
 
 void
@@ -214,8 +214,8 @@ objfile::expand_all_symtabs ()
     fprintf_filtered (gdb_stdlog, "qf->expand_all_symtabs (%s)\n",
 		      objfile_debug_name (this));
 
-  if (sf != nullptr)
-    sf->qf->expand_all_symtabs (this);
+  if (qf != nullptr)
+    qf->expand_all_symtabs (this);
 }
 
 void
@@ -226,8 +226,8 @@ objfile::expand_symtabs_with_fullname (const char *fullname)
 		      "qf->expand_symtabs_with_fullname (%s, \"%s\")\n",
 		      objfile_debug_name (this), fullname);
 
-  if (sf != nullptr)
-    sf->qf->expand_symtabs_with_fullname (this, fullname);
+  if (qf != nullptr)
+    qf->expand_symtabs_with_fullname (this, fullname);
 }
 
 void
@@ -244,9 +244,9 @@ objfile::map_matching_symbols
 		      domain_name (domain), global,
 		      host_address_to_string (ordered_compare));
 
-  if (sf != nullptr)
-    sf->qf->map_matching_symbols (this, name, domain, global,
-				  callback, ordered_compare);
+  if (qf != nullptr)
+    qf->map_matching_symbols (this, name, domain, global,
+			      callback, ordered_compare);
 }
 
 void
@@ -266,9 +266,9 @@ objfile::expand_symtabs_matching
 		      host_address_to_string (&expansion_notify),
 		      search_domain_name (kind));
 
-  if (sf != nullptr)
-    sf->qf->expand_symtabs_matching (this, file_matcher, lookup_name,
-				     symbol_matcher, expansion_notify, kind);
+  if (qf != nullptr)
+    qf->expand_symtabs_matching (this, file_matcher, lookup_name,
+				 symbol_matcher, expansion_notify, kind);
 }
 
 struct compunit_symtab *
@@ -288,10 +288,9 @@ objfile::find_pc_sect_compunit_symtab (struct bound_minimal_symbol msymbol,
 		      host_address_to_string (section),
 		      warn_if_readin);
 
-  if (sf != nullptr)
-    retval
-      = sf->qf->find_pc_sect_compunit_symtab (this, msymbol, pc, section,
-					      warn_if_readin);
+  if (qf != nullptr)
+    retval = qf->find_pc_sect_compunit_symtab (this, msymbol, pc, section,
+					       warn_if_readin);
 
   if (debug_symfile)
     fprintf_filtered (gdb_stdlog,
@@ -315,8 +314,8 @@ objfile::map_symbol_filenames (symbol_filename_ftype *fun, void *data,
 		      host_address_to_string (data),
 		      need_fullname);
 
-  if (sf != nullptr)
-    sf->qf->map_symbol_filenames (this, fun, data, need_fullname);
+  if (qf != nullptr)
+    qf->map_symbol_filenames (this, fun, data, need_fullname);
 }
 
 struct compunit_symtab *
@@ -329,8 +328,8 @@ objfile::find_compunit_symtab_by_address (CORE_ADDR address)
 		      hex_string (address));
 
   struct compunit_symtab *result = NULL;
-  if (sf != nullptr && sf->qf->find_compunit_symtab_by_address != NULL)
-    result = sf->qf->find_compunit_symtab_by_address (this, address);
+  if (qf != nullptr && qf->find_compunit_symtab_by_address != NULL)
+    result = qf->find_compunit_symtab_by_address (this, address);
 
   if (debug_symfile)
     fprintf_filtered (gdb_stdlog,
@@ -349,9 +348,9 @@ objfile::lookup_global_symbol_language (const char *name,
 {
   enum language result = language_unknown;
 
-  if (sf != nullptr && sf->qf->lookup_global_symbol_language != nullptr)
-    result = sf->qf->lookup_global_symbol_language (this, name, domain,
-						    symbol_found_p);
+  if (qf != nullptr && qf->lookup_global_symbol_language != nullptr)
+    result = qf->lookup_global_symbol_language (this, name, domain,
+						symbol_found_p);
   else
     *symbol_found_p = false;
 
@@ -516,7 +515,6 @@ static const struct sym_fns debug_sym_fns =
   debug_sym_read_linetable,
   debug_sym_relocate,
   &debug_sym_probe_fns,
-  nullptr
 };
 
 /* Install the debugging versions of the symfile functions for OBJFILE.
@@ -555,7 +553,6 @@ install_symfile_debug_logging (struct objfile *objfile)
   COPY_SF_PTR (real_sf, debug_data, sym_relocate, debug_sym_relocate);
   if (real_sf->sym_probe_fns)
     debug_data->debug_sf.sym_probe_fns = &debug_sym_probe_fns;
-  debug_data->debug_sf.qf = real_sf->qf;
 
 #undef COPY_SF_PTR
 
diff --git a/gdb/symfile.c b/gdb/symfile.c
index ac9adc8..d56d623 100644
--- a/gdb/symfile.c
+++ b/gdb/symfile.c
@@ -904,6 +904,7 @@ syms_from_objfile_1 (struct objfile *objfile,
   const int mainline = add_flags & SYMFILE_MAINLINE;
 
   objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd));
+  objfile->qf = &psym_functions;
 
   if (objfile->sf == NULL)
     {
@@ -2554,6 +2555,7 @@ reread_symbols (void)
 	     based on whether .gdb_index is present, and we need it to
 	     start over.  PR symtab/15885  */
 	  objfile_set_sym_fns (objfile, find_sym_fns (objfile->obfd));
+	  objfile->qf = &psym_functions;
 
 	  build_objfile_section_table (objfile);
 
diff --git a/gdb/symfile.h b/gdb/symfile.h
index c87bbed..2c37f88 100644
--- a/gdb/symfile.h
+++ b/gdb/symfile.h
@@ -180,10 +180,6 @@ struct sym_fns
   /* If non-NULL, this objfile has probe support, and all the probe
      functions referred to here will be non-NULL.  */
   const struct sym_probe_fns *sym_probe_fns;
-
-  /* The "quick" (aka partial) symbol functions for this symbol
-     reader.  */
-  const struct quick_symbol_functions *qf;
 };
 
 extern section_addr_info
diff --git a/gdb/xcoffread.c b/gdb/xcoffread.c
index 612ffb1..e0e7a8f 100644
--- a/gdb/xcoffread.c
+++ b/gdb/xcoffread.c
@@ -3006,7 +3006,6 @@ static const struct sym_fns xcoff_sym_fns =
   aix_process_linenos,
   default_symfile_relocate,	/* Relocate a debug section.  */
   NULL,				/* sym_probe_fns */
-  &psym_functions
 };
 
 /* Same as xcoff_get_n_import_files, but for core files.  */