2017-07-21 Yury Gribov <tetra2005@gmail.com>

	PR middle-end/56727
	* ipa-visibility (function_and_variable_visibility): Convert
	recursive PLT call to direct call if appropriate.

	* gcc.dg/pr56727-1.c: New test.
	* gcc.dg/pr56727-2.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@250442 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 31 insertions, 0 deletions

diff --git a/gcc/ipa-visibility.c b/gcc/ipa-visibility.c
index 17186e9d2e6..21321703dbb 100644
--- a/gcc/ipa-visibility.c
+++ b/gcc/ipa-visibility.c
@@ -83,6 +83,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "cgraph.h"
 #include "calls.h"
 #include "varasm.h"
+#include "ipa-utils.h"
 
 /* Return true when NODE can not be local. Worker for cgraph_local_node_p.  */
 
@@ -617,6 +618,36 @@ function_and_variable_visibility (bool whole_program)
   /* All aliases should be procssed at this point.  */
   gcc_checking_assert (!alias_pairs || !alias_pairs->length ());
 
+  FOR_EACH_DEFINED_FUNCTION (node)
+    {
+      if (node->get_availability () != AVAIL_INTERPOSABLE
+	  || DECL_EXTERNAL (node->decl)
+	  || node->has_aliases_p ())
+	continue;
+
+      cgraph_node *alias = 0;
+      for (cgraph_edge *e = node->callees; e; e = e->next_callee)
+	{
+	  /* Recursive function calls usually can't be interposed.  */
+
+	  if (!e->recursive_p ())
+	    continue;
+
+	  if (!alias)
+	    { 
+	      alias = dyn_cast<cgraph_node *> (node->noninterposable_alias ());
+	      gcc_assert (alias && alias != node);
+	    }
+
+	  e->redirect_callee (alias);
+	  if (gimple_has_body_p (e->caller->decl))
+	    { 
+	      push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl));
+	      e->redirect_call_stmt_to_callee ();
+	      pop_cfun (); 
+	    }
+	}
+    }
   FOR_EACH_FUNCTION (node)
     {
       int flags = flags_from_decl_or_type (node->decl);