gdb: add compunit_symtab::set_primary_filetab method

Add a method to set the primary filetab of the CU.  This is currently
done in buildsym_compunit::end_symtab_with_blockvector.

Change-Id: I16c51a6b90a4cb4c0c5f183b0f2e12bc64b6fd74

3 files changed, 36 insertions, 22 deletions

diff --git a/gdb/buildsym.c b/gdb/buildsym.c
index 1754f5f..914834f 100644
--- a/gdb/buildsym.c
+++ b/gdb/buildsym.c
@@ -996,28 +996,8 @@ buildsym_compunit::end_symtab_with_blockvector (struct block *static_block,
       symtab->language = subfile->language;
     }
 
-  /* Make sure the symtab of main_subfile is the first in its list.  */
-  {
-    struct symtab *main_symtab, *prev_symtab;
-
-    main_symtab = m_main_subfile->symtab;
-    prev_symtab = NULL;
-    for (symtab *symtab : compunit_filetabs (cu))
-      {
-	if (symtab == main_symtab)
-	  {
-	    if (prev_symtab != NULL)
-	      {
-		prev_symtab->next = main_symtab->next;
-		main_symtab->next = COMPUNIT_FILETABS (cu);
-		COMPUNIT_FILETABS (cu) = main_symtab;
-	      }
-	    break;
-	  }
-	prev_symtab = symtab;
-      }
-    gdb_assert (main_symtab == COMPUNIT_FILETABS (cu));
-  }
+  /* Make sure the filetab of main_subfile is the primary filetab of the CU.  */
+  cu->set_primary_filetab (m_main_subfile->symtab);
 
   /* Fill out the compunit symtab.  */
 
diff --git a/gdb/symtab.c b/gdb/symtab.c
index 2028e83..f4f5f09 100644
--- a/gdb/symtab.c
+++ b/gdb/symtab.c
@@ -361,6 +361,34 @@ compunit_symtab::set_call_site_htab (htab_t call_site_htab)
 
 /* See symtab.h.  */
 
+void
+compunit_symtab::set_primary_filetab (symtab *primary_filetab)
+{
+  symtab *prev_filetab = nullptr;
+
+  /* Move PRIMARY_FILETAB to the head of the filetab list.  */
+  for (symtab *filetab : compunit_filetabs (this))
+    {
+      if (filetab == primary_filetab)
+	{
+	  if (prev_filetab != nullptr)
+	    {
+	      prev_filetab->next = primary_filetab->next;
+	      primary_filetab->next = this->filetabs;
+	      this->filetabs = primary_filetab;
+	    }
+
+	  break;
+	}
+
+      prev_filetab = filetab;
+    }
+
+  gdb_assert (primary_filetab == this->filetabs);
+}
+
+/* See symtab.h.  */
+
 struct symtab *
 compunit_symtab::primary_filetab () const
 {
diff --git a/gdb/symtab.h b/gdb/symtab.h
index 3fa4d5f..23a348a 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -1473,6 +1473,12 @@ struct compunit_symtab
       }
   }
 
+  /* Make PRIMARY_FILETAB the primary filetab of this compunit symtab.
+
+     PRIMARY_FILETAB must already be a filetab of this compunit symtab.  */
+
+  void set_primary_filetab (symtab *primary_filetab);
+
   /* Return the primary filetab of the compunit.  */
   symtab *primary_filetab () const;