WHOPR versus passmanager 1

[Jan Hubicka <hubicka at ucw dot cz>]

Hi,
this patch makes WHOPR to use passmanager to do the WPA stage.  Since streaming
of optimization summaries is nonexistent or totally wrong, I disabled for now
all passes except for inliner.

In next step, I would like to add passmanager hooks for optimization summary streamig.

Then cleanup cgraph stramer and split it to two section.  First section to
contain cgrpah itself that will be the same for lto/wpa/ltrans streaming and
the second to contain optimization summaries - that is clone infos, edge flags
etc. etc.

The idea is that I would realy like to get cgraph section stable across
releases eventually (we are far from that given that we promplty stream all
nonsential flags we can think of).

Bootstrapped/regtested x86_64-linux, OK?

Honza

	* opts.c (decode_options): Disable whpr incompatible passes.
	* lto/lto.c (lto_1_to_1_map): Skip clones.
	(read_cgraph_and_symbols): Do not mark everything as needed.
	(do_whole_program_analysis): Do map only after optimizing;
	set proper cgraph_state; use passmanager.
Index: opts.c
===================================================================
--- opts.c	(revision 158462)
+++ opts.c	(working copy)
@@ -1120,6 +1120,16 @@ decode_options (unsigned int argc, const
       if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
         PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
     }
+  if (flag_wpa || flag_ltrans)
+    {
+      /* These passes are not WHOPR compatible yet.  */
+      flag_ipa_cp = 0;
+      flag_ipa_reference = 0;
+      flag_ipa_pure_const = 0;
+      flag_ipa_type_escape = 0;
+      flag_ipa_pta = 0;
+      flag_ipa_struct_reorg = 0;
+    }
 
   if (flag_lto || flag_whopr)
     {
Index: lto/lto.c
===================================================================
--- lto/lto.c	(revision 158462)
+++ lto/lto.c	(working copy)
@@ -554,6 +554,10 @@ lto_1_to_1_map (void)
 
   for (node = cgraph_nodes; node; node = node->next)
     {
+      /* We will get proper partition based on function they are inlined to or
+	 cloned from.  */
+      if (node->global.inlined_to || node->clone_of)
+	continue;
       /* We only need to partition the nodes that we read from the
 	 gimple bytecode files.  */
       file_data = node->local.lto_file_data;
@@ -1881,19 +1885,9 @@ read_cgraph_and_symbols (unsigned nfiles
   /* Finally merge the cgraph according to the decl merging decisions.  */
   lto_symtab_merge_cgraph_nodes ();
 
-  /* Mark cgraph nodes needed in the merged cgraph
-     This normally happens in whole-program pass, but for
-     ltrans the pass was already run at WPA phase.
-     
-     FIXME:  This is not valid way to do so; nodes can be needed
-     for non-obvious reasons.  We should stream the flags from WPA
-     phase. */
   if (flag_ltrans)
     for (node = cgraph_nodes; node; node = node->next)
       {
-        if (!node->global.inlined_to
-	    && cgraph_decide_is_function_needed (node, node->decl))
-          cgraph_mark_needed_node (node);
 	/* FIXME: ipa_transforms_to_apply holds list of passes that have optimization
 	   summaries computed and needs to apply changes.  At the moment WHOPR only
 	   supports inlining, so we can push it here by hand.  In future we need to stream
@@ -1986,9 +1980,6 @@ do_whole_program_analysis (void)
 {
   char **output_files;
   size_t i;
-  struct cgraph_node *node; 
-
-  lto_1_to_1_map ();
 
   /* Note that since we are in WPA mode, materialize_cgraph will not
      actually read in all the function bodies.  It only materializes
@@ -1998,20 +1989,12 @@ do_whole_program_analysis (void)
   /* Reading in the cgraph uses different timers, start timing WPA now.  */
   timevar_push (TV_WHOPR_WPA);
 
-  /* FIXME lto. Hack. We should use the IPA passes.  There are a
-     number of issues with this now. 1. There is no convenient way to
-     do this. 2. Some passes may depend on properties that requires
-     the function bodies to compute.  */
   cgraph_function_flags_ready = true;
   bitmap_obstack_initialize (NULL);
   ipa_register_cgraph_hooks ();
+  cgraph_state = CGRAPH_STATE_IPA_SSA;
 
-  /* Reset inlining information before running IPA inliner.  */
-  for (node = cgraph_nodes; node; node = node->next)
-    reset_inline_failed (node);
-
-  /* FIXME lto.  We should not call this function directly. */
-  pass_ipa_inline.pass.execute ();
+  execute_ipa_pass_list (all_regular_ipa_passes);
 
   verify_cgraph ();
   bitmap_obstack_release (NULL);
@@ -2019,6 +2002,8 @@ do_whole_program_analysis (void)
   /* We are about to launch the final LTRANS phase, stop the WPA timer.  */
   timevar_pop (TV_WHOPR_WPA);
 
+  lto_1_to_1_map ();
+
   output_files = lto_wpa_write_files ();
 
   /* Show the LTO report before launching LTRANS.  */