re PR middle-end/64922 (runtime error: member call on misaligned address for type 'struct _Rep')

	PR middle-end/64922
	* gimple.c: Include gimple-ssa.h.
	(maybe_remove_unused_call_args): New function.
	* gimple.h (maybe_remove_unused_call_args): Declare.
	* cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Use it.
	* tree-ssa-pre.c (eliminate_dom_walker::before_dom_children): Likewise.
	* gimple-fold.c (gimple_fold_call): Likewise.

From-SVN: r220417

6 files changed, 36 insertions, 1 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f724d54..755ff3e 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2015-02-04  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR middle-end/64922
+	* gimple.c: Include gimple-ssa.h.
+	(maybe_remove_unused_call_args): New function.
+	* gimple.h (maybe_remove_unused_call_args): Declare.
+	* cgraph.c (cgraph_edge::redirect_call_stmt_to_callee): Use it.
+	* tree-ssa-pre.c (eliminate_dom_walker::before_dom_children): Likewise.
+	* gimple-fold.c (gimple_fold_call): Likewise.
+
 2015-02-04  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR rtl-optimization/64905
diff --git a/gcc/cgraph.c b/gcc/cgraph.c
index 89d0d2f..8ea8ae9 100644
--- a/gcc/cgraph.c
+++ b/gcc/cgraph.c
@@ -1324,7 +1324,8 @@ cgraph_edge::redirect_call_stmt_to_callee (void)
 		     (int64_t)e->count);
 	  gcc_assert (e2->speculative);
 	  push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl));
-	  new_stmt = gimple_ic (e->call_stmt, dyn_cast<cgraph_node *> (ref->referred),
+	  new_stmt = gimple_ic (e->call_stmt,
+				dyn_cast<cgraph_node *> (ref->referred),
 				e->count || e2->count
 				?  RDIV (e->count * REG_BR_PROB_BASE,
 					 e->count + e2->count)
@@ -1464,6 +1465,9 @@ cgraph_edge::redirect_call_stmt_to_callee (void)
       update_stmt_fn (DECL_STRUCT_FUNCTION (e->caller->decl), new_stmt);
     }
 
+  maybe_remove_unused_call_args (DECL_STRUCT_FUNCTION (e->caller->decl),
+				 new_stmt);
+
   e->caller->set_call_stmt_including_clones (e->call_stmt, new_stmt, false);
 
   if (symtab->dump_file)
diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index 3015901..f89220c 100644
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -3120,6 +3120,7 @@ gimple_fold_call (gimple_stmt_iterator *gsi, bool inplace)
 			}
 		      gimple_call_set_lhs (stmt, NULL_TREE);
 		    }
+		  maybe_remove_unused_call_args (cfun, stmt);
 		}
 	      else
 		{
diff --git a/gcc/gimple.c b/gcc/gimple.c
index caa1cbd..a5c1192 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -67,6 +67,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "ipa-ref.h"
 #include "lto-streamer.h"
 #include "cgraph.h"
+#include "gimple-ssa.h"
 
 
 /* All the tuples have their operand vector (if present) at the very bottom
@@ -2950,3 +2951,20 @@ gimple_seq_discard (gimple_seq seq)
       ggc_free (stmt);
     }
 }
+
+/* See if STMT now calls function that takes no parameters and if so, drop
+   call arguments.  This is used when devirtualization machinery redirects
+   to __builtiln_unreacahble or __cxa_pure_virutal.  */
+
+void
+maybe_remove_unused_call_args (struct function *fn, gimple stmt)
+{
+  tree decl = gimple_call_fndecl (stmt);
+  if (TYPE_ARG_TYPES (TREE_TYPE (decl))
+      && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl))) == void_type_node
+      && gimple_call_num_args (stmt))
+    {
+      gimple_set_num_ops (stmt, 3);
+      update_stmt_fn (fn, stmt);
+    }
+}
diff --git a/gcc/gimple.h b/gcc/gimple.h
index 769bad0..5503625 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -1404,6 +1404,7 @@ extern void sort_case_labels (vec<tree>);
 extern void preprocess_case_label_vec_for_gimple (vec<tree>, tree, tree *);
 extern void gimple_seq_set_location (gimple_seq, location_t);
 extern void gimple_seq_discard (gimple_seq);
+extern void maybe_remove_unused_call_args (struct function *, gimple);
 
 /* Formal (expression) temporary table handling: multiple occurrences of
    the same scalar expression are evaluated into the same temporary.  */
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index 32cd74d..83b48df 100644
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -4406,6 +4406,7 @@ eliminate_dom_walker::before_dom_children (basic_block b)
 				       cgraph_node::get (fn)->name ());
 		    }
 		  gimple_call_set_fndecl (call_stmt, fn);
+		  maybe_remove_unused_call_args (cfun, call_stmt);
 		  gimple_set_modified (stmt, true);
 		}
 	    }