[PATCH, PR70161] Fix fdump-ipa-all-graph

[Tom de Vries]

Hi,

this patch fixes PR70161, a 4.9/5/6 regression.
Currently when using -fdump-ipa-all-graph, the compiler ICEs in 
execute_function_dump when testing for pass->graph_dump_initialized, 
because pass == NULL.

The patch fixes:
- the ICE by setting the pass argument in the call to
  execute_function_dump in execute_one_ipa_transform_pass
- a subsequent ICE (triggered with -fipa-pta) by saving, resetting and
  restoring dump_file_name in cgraph_node::get_body, alongside the
  saving and restoring of the dump_file variable.
- the duplicate edges in the subsequently generated dot file by
  ensuring that execute_function_dump is called only once per function
  per pass. [ Note that this bit also has an effect for the normal dump
  files for the ipa passes with transform function. For those functions,
  atm execute_function_dump is called both after execute and after
  transform. With the patch, it's only called after transform. ]

Bootstrapped and reg-tested on x86_64.

OK for stage4?

Thanks,
- Tom
Fix fdump-ipa-all-graph

2016-03-14  Tom de Vries  <t...@codesourcery.com>

	PR ipa/70161
	* cgraph.c (cgraph_node::get_body): Save, reset and restore
	dump_file_name.
	* passes.c (execute_one_ipa_transform_pass): Add missing argument to
	execute_function_dump.
	(execute_one_pass): Don't dump function if it will be dumped after ipa
	transform.

---
 gcc/cgraph.c |  3 +++
 gcc/passes.c | 14 +++++++-------
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/gcc/cgraph.c b/gcc/cgraph.c
index 7727313..f187913 100644
--- a/gcc/cgraph.c
+++ b/gcc/cgraph.c
@@ -3365,7 +3365,9 @@ cgraph_node::get_body (void)
     {
       opt_pass *saved_current_pass = current_pass;
       FILE *saved_dump_file = dump_file;
+      const char *saved_dump_file_name = dump_file_name;
       int saved_dump_flags = dump_flags;
+      dump_file_name = NULL;
 
       push_cfun (DECL_STRUCT_FUNCTION (decl));
       execute_all_ipa_transforms ();
@@ -3377,6 +3379,7 @@ cgraph_node::get_body (void)
 
       current_pass = saved_current_pass;
       dump_file = saved_dump_file;
+      dump_file_name = saved_dump_file_name;
       dump_flags = saved_dump_flags;
     }
   return updated;
diff --git a/gcc/passes.c b/gcc/passes.c
index bbe35b3..5aa2b32 100644
--- a/gcc/passes.c
+++ b/gcc/passes.c
@@ -2219,7 +2219,7 @@ execute_one_ipa_transform_pass (struct cgraph_node *node,
     check_profile_consistency (pass->static_pass_number, 1, true);
 
   if (dump_file)
-    do_per_function (execute_function_dump, NULL);
+    do_per_function (execute_function_dump, pass);
   pass_fini_dump_file (pass);
 
   current_pass = NULL;
@@ -2356,15 +2356,15 @@ execute_one_pass (opt_pass *pass)
     check_profile_consistency (pass->static_pass_number, 1, true);
 
   verify_interpass_invariants ();
-  if (dump_file)
-    do_per_function (execute_function_dump, pass);
-  if (pass->type == IPA_PASS)
+  if (pass->type == IPA_PASS
+      && ((ipa_opt_pass_d *)pass)->function_transform)
     {
       struct cgraph_node *node;
-      if (((ipa_opt_pass_d *)pass)->function_transform)
-	FOR_EACH_FUNCTION_WITH_GIMPLE_BODY (node)
-	  node->ipa_transforms_to_apply.safe_push ((ipa_opt_pass_d *)pass);
+      FOR_EACH_FUNCTION_WITH_GIMPLE_BODY (node)
+	node->ipa_transforms_to_apply.safe_push ((ipa_opt_pass_d *)pass);
     }
+  else if (dump_file)
+    do_per_function (execute_function_dump, pass);
 
   if (!current_function_decl)
     symtab->process_new_functions ();