Remove special support in gdb for Sun's version of stabs.

Discussion:
https://sourceware.org/ml/gdb-patches/2015-05/msg00169.html

gdb/ChangeLog:

	* NEWS: Mention Sun's version of stabs is no longer supported.
	* elfread.c (free_elfinfo): Delete.  All uses updated.
	(elfstab_offset_sections): Delete.  All uses updated.
	* gdb-stabs.h (stab_section_info): Delete.  All uses updated.
	* psympriv.h (partial_symtab) <section_offsets>: Delete.
	All uses updated.
	* psymtab.c (start_psymtab_common): Delete arg section_offsets.
	All callers updated.

gdb/doc/ChangeLog:

	* stabs.texinfo (ELF Linker Relocation): Mention Sun stabs is no
	longer supported.

1 files changed, 4 insertions, 180 deletions

diff --git a/gdb/elfread.c b/gdb/elfread.c
index 4b97b04..0e169c7 100644
--- a/gdb/elfread.c
+++ b/gdb/elfread.c
@@ -66,8 +66,6 @@ struct elfinfo
 
 static const struct bfd_data *probe_key = NULL;
 
-static void free_elfinfo (void *);
-
 /* Minimal symbols located at the GOT entries for .plt - that is the real
    pointer where the given entry will jump to.  It gets updated by the real
    function address during lazy ld.so resolving in the inferior.  These
@@ -236,14 +234,8 @@ elf_symtab_read (struct objfile *objfile, int type,
   CORE_ADDR symaddr;
   CORE_ADDR offset;
   enum minimal_symbol_type ms_type;
-  /* If sectinfo is nonNULL, it contains section info that should end up
-     filed in the objfile.  */
-  struct stab_section_info *sectinfo = NULL;
-  /* If filesym is nonzero, it points to a file symbol, but we haven't
-     seen any section info for it yet.  */
-  asymbol *filesym = 0;
-  /* Name of filesym.  This is either a constant string or is saved on
-     the objfile's filename cache.  */
+  /* Name of the last file symbol.  This is either a constant string or is
+     saved on the objfile's filename cache.  */
   const char *filesymname = "";
   struct dbx_symfile_info *dbx = DBX_SYMFILE_INFO (objfile);
   int stripped = (bfd_get_symcount (objfile->obfd) == 0);
@@ -345,16 +337,7 @@ elf_symtab_read (struct objfile *objfile, int type,
 	continue;
       if (sym->flags & BSF_FILE)
 	{
-	  /* STT_FILE debugging symbol that helps stabs-in-elf debugging.
-	     Chain any old one onto the objfile; remember new sym.  */
-	  if (sectinfo != NULL)
-	    {
-	      sectinfo->next = dbx->stab_section_info;
-	      dbx->stab_section_info = sectinfo;
-	      sectinfo = NULL;
-	    }
-	  filesym = sym;
-	  filesymname = bcache (filesym->name, strlen (filesym->name) + 1,
+	  filesymname = bcache (sym->name, strlen (sym->name) + 1,
 				objfile->per_bfd->filename_cache);
 	}
       else if (sym->flags & BSF_SECTION_SYM)
@@ -451,77 +434,6 @@ elf_symtab_read (struct objfile *objfile, int type,
 		}
 	      else if (sym->flags & BSF_LOCAL)
 		{
-		  /* Named Local variable in a Data section.
-		     Check its name for stabs-in-elf.  */
-		  int special_local_sect;
-
-		  if (strcmp ("Bbss.bss", sym->name) == 0)
-		    special_local_sect = SECT_OFF_BSS (objfile);
-		  else if (strcmp ("Ddata.data", sym->name) == 0)
-		    special_local_sect = SECT_OFF_DATA (objfile);
-		  else if (strcmp ("Drodata.rodata", sym->name) == 0)
-		    special_local_sect = SECT_OFF_RODATA (objfile);
-		  else
-		    special_local_sect = -1;
-		  if (special_local_sect >= 0)
-		    {
-		      /* Found a special local symbol.  Allocate a
-			 sectinfo, if needed, and fill it in.  */
-		      if (sectinfo == NULL)
-			{
-			  int max_index;
-			  size_t size;
-
-			  max_index = SECT_OFF_BSS (objfile);
-			  if (objfile->sect_index_data > max_index)
-			    max_index = objfile->sect_index_data;
-			  if (objfile->sect_index_rodata > max_index)
-			    max_index = objfile->sect_index_rodata;
-
-			  /* max_index is the largest index we'll
-			     use into this array, so we must
-			     allocate max_index+1 elements for it.
-			     However, 'struct stab_section_info'
-			     already includes one element, so we
-			     need to allocate max_index aadditional
-			     elements.  */
-			  size = (sizeof (struct stab_section_info)
-				  + (sizeof (CORE_ADDR) * max_index));
-			  sectinfo = (struct stab_section_info *)
-			    xmalloc (size);
-			  memset (sectinfo, 0, size);
-			  sectinfo->num_sections = max_index;
-			  if (filesym == NULL)
-			    {
-			      complaint (&symfile_complaints,
-					 _("elf/stab section information %s "
-					   "without a preceding file symbol"),
-					 sym->name);
-			    }
-			  else
-			    {
-			      sectinfo->filename =
-				(char *) filesym->name;
-			    }
-			}
-		      if (sectinfo->sections[special_local_sect] != 0)
-			complaint (&symfile_complaints,
-				   _("duplicated elf/stab section "
-				     "information for %s"),
-				   sectinfo->filename);
-		      /* BFD symbols are section relative.  */
-		      symaddr = sym->value + sym->section->vma;
-		      /* Relocate non-absolute symbols by the
-			 section offset.  */
-		      if (sym->section != bfd_abs_section_ptr)
-			symaddr += offset;
-		      sectinfo->sections[special_local_sect] = symaddr;
-		      /* The special local symbols don't go in the
-			 minimal symbol table, so ignore this one.  */
-		      continue;
-		    }
-		  /* Not a special stabs-in-elf symbol, do regular
-		     symbol processing.  */
 		  if (sym->section->flags & SEC_LOAD)
 		    {
 		      ms_type = mst_file_data;
@@ -1130,11 +1042,8 @@ elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags,
   /* Allocate struct to keep track of the symfile.  */
   dbx = XCNEW (struct dbx_symfile_info);
   set_objfile_data (objfile, dbx_objfile_data_key, dbx);
-  make_cleanup (free_elfinfo, (void *) objfile);
 
-  /* Process the normal ELF symbol table first.  This may write some
-     chain of info into the dbx_symfile_info of the objfile, which can
-     later be used by elfstab_offset_sections.  */
+  /* Process the normal ELF symbol table first.  */
 
   storage_needed = bfd_get_symtab_upper_bound (objfile->obfd);
   if (storage_needed < 0)
@@ -1369,28 +1278,6 @@ read_psyms (struct objfile *objfile)
     dwarf2_build_psymtabs (objfile);
 }
 
-/* This cleans up the objfile's dbx symfile info, and the chain of
-   stab_section_info's, that might be dangling from it.  */
-
-static void
-free_elfinfo (void *objp)
-{
-  struct objfile *objfile = (struct objfile *) objp;
-  struct dbx_symfile_info *dbxinfo = DBX_SYMFILE_INFO (objfile);
-  struct stab_section_info *ssi, *nssi;
-
-  ssi = dbxinfo->stab_section_info;
-  while (ssi)
-    {
-      nssi = ssi->next;
-      xfree (ssi);
-      ssi = nssi;
-    }
-
-  dbxinfo->stab_section_info = 0;	/* Just say No mo info about this.  */
-}
-
-
 /* Initialize anything that needs initializing when a completely new symbol
    file is specified (not just adding some symbols from another file, e.g. a
    shared library).
@@ -1427,69 +1314,6 @@ elf_symfile_init (struct objfile *objfile)
   objfile->flags |= OBJF_REORDERED;
 }
 
-/* When handling an ELF file that contains Sun STABS debug info,
-   some of the debug info is relative to the particular chunk of the
-   section that was generated in its individual .o file.  E.g.
-   offsets to static variables are relative to the start of the data
-   segment *for that module before linking*.  This information is
-   painfully squirreled away in the ELF symbol table as local symbols
-   with wierd names.  Go get 'em when needed.  */
-
-void
-elfstab_offset_sections (struct objfile *objfile, struct partial_symtab *pst)
-{
-  const char *filename = pst->filename;
-  struct dbx_symfile_info *dbx = DBX_SYMFILE_INFO (objfile);
-  struct stab_section_info *maybe = dbx->stab_section_info;
-  struct stab_section_info *questionable = 0;
-  int i;
-
-  /* The ELF symbol info doesn't include path names, so strip the path
-     (if any) from the psymtab filename.  */
-  filename = lbasename (filename);
-
-  /* FIXME:  This linear search could speed up significantly
-     if it was chained in the right order to match how we search it,
-     and if we unchained when we found a match.  */
-  for (; maybe; maybe = maybe->next)
-    {
-      if (filename[0] == maybe->filename[0]
-	  && filename_cmp (filename, maybe->filename) == 0)
-	{
-	  /* We found a match.  But there might be several source files
-	     (from different directories) with the same name.  */
-	  if (0 == maybe->found)
-	    break;
-	  questionable = maybe;	/* Might use it later.  */
-	}
-    }
-
-  if (maybe == 0 && questionable != 0)
-    {
-      complaint (&symfile_complaints,
-		 _("elf/stab section information questionable for %s"),
-		 filename);
-      maybe = questionable;
-    }
-
-  if (maybe)
-    {
-      /* Found it!  Allocate a new psymtab struct, and fill it in.  */
-      maybe->found++;
-      pst->section_offsets = (struct section_offsets *)
-	obstack_alloc (&objfile->objfile_obstack,
-		       SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
-      for (i = 0; i < maybe->num_sections; i++)
-	(pst->section_offsets)->offsets[i] = maybe->sections[i];
-      return;
-    }
-
-  /* We were unable to find any offsets for this file.  Complain.  */
-  if (dbx->stab_section_info)	/* If there *is* any info, */
-    complaint (&symfile_complaints,
-	       _("elf/stab section information missing for %s"), filename);
-}
-
 /* Implementation of `sym_get_probes', as documented in symfile.h.  */
 
 static VEC (probe_p) *