drop attempt to reuse cgraph callees for -fcallgraph-info

The information in cgraph callees is released long before we get to
the point in which -fcallgraph-info edges are dumped, or even
expanded.  It doesn't make sense to retain it longer: the edges
created for -fcallgraph-info are much smaller, and they don't even
coexist, so not even peak use grows.


for  gcc/ChangeLog

	* function.h (CALLEE_FROM_CGRAPH_P): Remove.
	* function.c (record_final_call): Record even calls that might
	have been in the cgraph.
	* toplev.c (dump_final_node_vcg): Skip iteration over cgraph
	callees.

From-SVN: r278529

gcc/ChangeLog

+2019-11-20  Alexandre Oliva <oliva@adacore.com>
+
+	* function.h (CALLEE_FROM_CGRAPH_P): Remove.
+	* function.c (record_final_call): Record even calls that might
+	have been in the cgraph.
+	* toplev.c (dump_final_node_vcg): Skip iteration over cgraph
+	callees.
+
 2019-11-20  Janne Blomqvist  <jb@gcc.gnu.org>
 
 	* configure.ac: Use https for gcc.gnu.org

gcc/function.c

@@ -6406,9 +6406,6 @@ rest_of_handle_thread_prologue_and_epilogue (void)
 void
 record_final_call (tree callee, location_t location)
 {
-  if (!callee || CALLEE_FROM_CGRAPH_P (callee))
-    return;
-
   struct callinfo_callee datum = { location, callee };
   vec_safe_push (cfun->su->callees, datum);
 }

gcc/function.h

@@ -192,15 +192,12 @@ public:
   poly_int64 length;
 };
 
-/* Describe emitted builtin calls for -fcallgraph-info.  Those that
-   are not builtin are taken from cgraph edges.  */
+/* Describe emitted calls for -fcallgraph-info.  */
 struct GTY(()) callinfo_callee
 {
   location_t location;
   tree decl;
 };
-#define CALLEE_FROM_CGRAPH_P(T)				\
-  (!fndecl_built_in_p (T) && !DECL_IS_BUILTIN (T))
 
 /* Describe dynamic allocation for -fcallgraph-info=da.  */
 struct GTY(()) callinfo_dalloc

gcc/toplev.c

@@ -1093,14 +1093,6 @@ dump_final_node_vcg (FILE *f)
     dump_final_callee_vcg (f, c->location, c->decl);
   vec_free (cfun->su->callees);
   cfun->su->callees = NULL;
-
-  cgraph_node *cnode = cgraph_node::get (current_function_decl);
-  for (cgraph_edge *e = cnode->callees; e; e = e->next_callee)
-    if (CALLEE_FROM_CGRAPH_P (e->callee->decl))
-      dump_final_callee_vcg (f, gimple_location (e->call_stmt),
-			     e->callee->decl);
-  for (cgraph_edge *e = cnode->indirect_calls; e; e = e->next_callee)
-    dump_final_callee_vcg (f, gimple_location (e->call_stmt), NULL);
 }
 
 /* Output stack usage and callgraph info, as requested.  */