passes.c (execute_function_dump): Set graph_dump_initialized appropriately.

	* passes.c (execute_function_dump): Set graph_dump_initialized
	appropriately.
	(pass_init_dump_file): Similarly.
	(execute_one_pass): Pass new argument to do_per_function.
	* tree-pass.h (class opt_pass): New field graph_dump_initialized.

From-SVN: r206092

gcc/ChangeLog

 2013-12-18  Aldy Hernandez  <aldyh@redhat.com>
 
+	* passes.c (execute_function_dump): Set graph_dump_initialized
+	appropriately.
+	(pass_init_dump_file): Similarly.
+	(execute_one_pass): Pass new argument to do_per_function.
+	* tree-pass.h (class opt_pass): New field graph_dump_initialized.
+
+2013-12-18  Aldy Hernandez  <aldyh@redhat.com>
+
 	* doc/tree-ssa.texi (SSA Operands): Remove reference to
 	SSA_OP_VMAYUSE.
 	Synchronize SSA_OP* definitions with source.

gcc/passes.c

@@ -1640,8 +1640,10 @@ do_per_function_toporder (void (*callback) (void *data), void *data)
 /* Helper function to perform function body dump.  */
 
 static void
-execute_function_dump (void *data ATTRIBUTE_UNUSED)
+execute_function_dump (void *data)
 {
+  opt_pass *pass = (opt_pass *)data;
+
   if (dump_file && current_function_decl)
     {
       if (cfun->curr_properties & PROP_trees)
@@ -1655,7 +1657,14 @@ execute_function_dump (void *data ATTRIBUTE_UNUSED)
 
       if ((cfun->curr_properties & PROP_cfg)
 	  && (dump_flags & TDF_GRAPH))
-	print_graph_cfg (dump_file_name, cfun);
+	{
+	  if (!pass->graph_dump_initialized)
+	    {
+	      clean_graph_dump_file (dump_file_name);
+	      pass->graph_dump_initialized = true;
+	    }
+	  print_graph_cfg (dump_file_name, cfun);
+	}
     }
 }
 
@@ -1936,6 +1945,7 @@ verify_curr_properties (void *data)
 bool
 pass_init_dump_file (opt_pass *pass)
 {
+  pass->graph_dump_initialized = false;
   /* If a dump file name is present, open it if enabled.  */
   if (pass->static_pass_number != -1)
     {
@@ -1950,7 +1960,10 @@ pass_init_dump_file (opt_pass *pass)
       if (initializing_dump
 	  && dump_file && (dump_flags & TDF_GRAPH)
 	  && cfun && (cfun->curr_properties & PROP_cfg))
-	clean_graph_dump_file (dump_file_name);
+	{
+	  clean_graph_dump_file (dump_file_name);
+	  pass->graph_dump_initialized = true;
+	}
       timevar_pop (TV_DUMP);
       return initializing_dump;
     }
@@ -2230,7 +2243,7 @@ execute_one_pass (opt_pass *pass)
 
   verify_interpass_invariants ();
   if (dump_file)
-    do_per_function (execute_function_dump, NULL);
+    do_per_function (execute_function_dump, pass);
   if (pass->type == IPA_PASS)
     {
       struct cgraph_node *node;

gcc/tree-pass.h

@@ -114,6 +114,11 @@ public:
   /* Static pass number, used as a fragment of the dump file name.  */
   int static_pass_number;
 
+  /* When a given dump file is being initialized, this flag is set to
+     true if the corresponding TDF_graph dump file has also been
+     initialized.  */
+  bool graph_dump_initialized;
+
 protected:
   gcc::context *m_ctxt;
 };