gas: Always use as_where for preprocessed assembly codes

Always clear the slot 1 if it was assigned to the input file before the
first .file <NUMBER> directive has been seen.  Always use as_where to
generate the correct debug infor for preprocessed assembly codes.

	PR gas/25878
	PR gas/26740
	* dwarf2dbg.c (allocate_filename_to_slot): Don't reuse the slot 1
	here.
	(dwarf2_where): Restore as_where.
	(dwarf2_directive_filename): Clear the slot 1 if it was assigned
	to the input file.
	* testsuite/gas/i386/dwarf5-line-2.d: New file.
	* testsuite/gas/i386/dwarf5-line-2.s: Likewise.
	* testsuite/gas/i386/dwarf5-line-3.d: Likewise.
	* testsuite/gas/i386/dwarf5-line-3.s: Likewise.
	* testsuite/gas/i386/i386.exp: Run dwarf5-line-2 and
	dwarf5-line-3.

1 files changed, 24 insertions, 19 deletions

diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c
index 6943dbf..75ef7c4 100644
--- a/gas/dwarf2dbg.c
+++ b/gas/dwarf2dbg.c
@@ -790,24 +790,15 @@ allocate_filename_to_slot (const char *  dirname,
 	}
 
     fail:
-      /* Reuse NUM if it is 1 and was assigned to the input file before
-	 the first .file <NUMBER> directive was seen.  */
-      file = as_where_physical (&i);
-      file = get_basename (file);
-      if (num == 1 && filename_cmp (file, files[num].filename) == 0)
-	files[num].filename = NULL;
-      else
-	{
-	  as_bad (_("file table slot %u is already occupied by a different file (%s%s%s vs %s%s%s)"),
-		  num,
-		  dir == NULL ? "" : dir,
-		  dir == NULL ? "" : "/",
-		  files[num].filename,
-		  dirname == NULL ? "" : dirname,
-		  dirname == NULL ? "" : "/",
-		  filename);
-	  return FALSE;
-	}
+      as_bad (_("file table slot %u is already occupied by a different file (%s%s%s vs %s%s%s)"),
+	      num,
+	      dir == NULL ? "" : dir,
+	      dir == NULL ? "" : "/",
+	      files[num].filename,
+	      dirname == NULL ? "" : dirname,
+	      dirname == NULL ? "" : "/",
+	      filename);
+      return FALSE;
     }
 
   if (dirname == NULL)
@@ -894,7 +885,7 @@ dwarf2_where (struct dwarf2_line_info *line)
       const char *filename;
 
       memset (line, 0, sizeof (*line));
-      filename = as_where_physical (&line->line);
+      filename = as_where (&line->line);
       line->filenum = allocate_filenum (filename);
       /* FIXME: We should check the return value from allocate_filenum.  */
       line->column = 0;
@@ -1088,6 +1079,20 @@ dwarf2_directive_filename (void)
       return NULL;
     }
 
+  if (files_in_use == 2)
+    {
+      /* Clear the slot 1 if it was assigned to the input file before
+	 the first .file <NUMBER> directive was seen.  */
+      unsigned int lineno;
+      const char *file = as_where (&lineno);
+      file = get_basename (file);
+      if (filename_cmp (file, files[1].filename) == 0)
+	{
+	  files[1].filename = NULL;
+	  files_in_use = 0;
+	}
+    }
+
   if (! allocate_filename_to_slot (dirname, filename, (unsigned int) num,
 				   with_md5))
     return NULL;