Get bootstrap to work with symbol promotion.

Previously, bootstrap was failing when compiling `genattrtab.c' because
a required varnode was being mistakenly removed of the symbol table.
This commit addresses this.

gcc/ChangeLog
2020-07-14  Giuliano Belinassi  <giuliano.belinassi@usp.br>

	* symtab.c (find_by_order): New function.
	(find_by_name): New function.
	(find_by_asm_naem): New function.
	* lto-cgraph.c (handle_node_in_boundary): Promote varnode in boundary
	to be external.

4 files changed, 55 insertions, 1 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 55474f0..9019521 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,13 @@
 2020-07-14  Giuliano Belinassi  <giuliano.belinassi@usp.br>
 
+	* symtab.c (find_by_order): New function.
+	(find_by_name): New function.
+	(find_by_asm_naem): New function.
+	* lto-cgraph.c (handle_node_in_boundary): Promote varnode in boundary
+	to be external.
+
+2020-07-14  Giuliano Belinassi  <giuliano.belinassi@usp.br>
+
 	* cgraphunit.c (ipa_passes): Move split_outputs to.
 	(symbol_table::compile): Here. Also make sure it runs after the IPA
 	transformation stage.
diff --git a/gcc/cgraph.h b/gcc/cgraph.h
index 962670c..a7779c1 100644
--- a/gcc/cgraph.h
+++ b/gcc/cgraph.h
@@ -463,6 +463,15 @@ public:
      Return NULL if there's no such node.  */
   static symtab_node *get_for_asmname (const_tree asmname);
 
+  /* Get symtab node by order.  */
+  static symtab_node *find_by_order (int order);
+
+  /* Get symtab_node by its name.  */
+  static symtab_node *find_by_name (const char *);
+
+  /* Get symtab_node by its ASM name.  */
+  static symtab_node *find_by_asm_name (const char *);
+
   /* Verify symbol table for internal consistency.  */
   static DEBUG_FUNCTION void verify_symtab_nodes (void);
 
diff --git a/gcc/lto-cgraph.c b/gcc/lto-cgraph.c
index 1971fdb..c57d16a 100644
--- a/gcc/lto-cgraph.c
+++ b/gcc/lto-cgraph.c
@@ -2126,7 +2126,10 @@ handle_node_in_boundary (symtab_node *node, bool keep_body)
 	}
     }
   else if (is_a <varpool_node *> (node) && !DECL_EXTERNAL (node->decl))
-    node->in_other_partition = true;
+    {
+      DECL_EXTERNAL (node->decl) = true;
+      node->in_other_partition = true;
+    }
 }
 
 /* Check the boundary and expands it if necessary, including more nodes or
diff --git a/gcc/symtab.c b/gcc/symtab.c
index a5fba15..f56dd69 100644
--- a/gcc/symtab.c
+++ b/gcc/symtab.c
@@ -2493,3 +2493,37 @@ symtab_node::output_to_lto_symbol_table_p (void)
     }
   return true;
 }
+
+DEBUG_FUNCTION symtab_node *
+symtab_node::find_by_order (int order)
+{
+  symtab_node *node;
+  FOR_EACH_SYMBOL (node)
+    if (node->order == order)
+      return node;
+
+  return NULL;
+}
+
+DEBUG_FUNCTION symtab_node *
+symtab_node::find_by_name (const char * name)
+{
+  symtab_node *node;
+  FOR_EACH_SYMBOL (node)
+    if (!strcmp (node->name (), name))
+      return node;
+
+  return NULL;
+}
+
+DEBUG_FUNCTION symtab_node *
+symtab_node::find_by_asm_name (const char *asm_name)
+{
+  symtab_node *node;
+  FOR_EACH_SYMBOL (node)
+    if (!strcmp (node->asm_name (), asm_name))
+      return node;
+
+  return NULL;
+
+}