Add -fopt-info-internals

This patch introduces a verbosity level to dump messages:
"user-facing" vs "internals".

By default, messages at the top-level dump scope are "user-facing",
whereas those that are in nested scopes are implicitly "internals",
and are filtered out by -fopt-info unless a new "-internals" sub-option
of "-fopt-info" is supplied (intended purely for use by GCC developers).
Dumpfiles are unaffected by the change.

Given that the vectorizer is the only subsystem using AUTO_DUMP_SCOPE
(via DUMP_VECT_SCOPE), this only affects the vectorizer.

Filtering out these implementation-detail messages goes a long way
towards making -fopt-info-vec-all more accessible to advanced end-users;
the follow-up patch restores the most pertinent missing details.

gcc/ChangeLog:
	* doc/invoke.texi (-fopt-info): Document new "internals"
	sub-option.
	* dump-context.h (dump_context::apply_dump_filter_p): New decl.
	* dumpfile.c (dump_options): Update for renaming of MSG_ALL to
	MSG_ALL_KINDS.
	(optinfo_verbosity_options): Add "internals".
	(kind_as_string): Update for renaming of MSG_ALL to MSG_ALL_KINDS.
	(dump_context::apply_dump_filter_p): New member function.
	(dump_context::dump_loc): Use apply_dump_filter_p rather than
	explicitly masking the dump_kind.
	(dump_context::begin_scope): Increment the scope depth first.  Use
	apply_dump_filter_p rather than explicitly masking the dump_kind.
	(dump_context::emit_item): Use apply_dump_filter_p rather than
	explicitly masking the dump_kind.
	(dump_dec): Likewise.
	(dump_hex): Likewise.
	(dump_switch_p_1): Default to MSG_ALL_PRIORITIES.
	(opt_info_switch_p_1): Default to MSG_PRIORITY_USER_FACING.
	(opt_info_switch_p): Update handling of default
	MSG_OPTIMIZED_LOCATIONS to cope with default of
	MSG_PRIORITY_USER_FACING.
	(dump_basic_block): Use apply_dump_filter_p rather than explicitly
	masking the dump_kind.
	(selftest::test_capture_of_dump_calls): Update test_dump_context
	instances to use MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING rather
	than MSG_ALL.  Generalize scope test to be run at all four
	combinations of with/without MSG_PRIORITY_USER_FACING and
	MSG_PRIORITY_INTERNALS, adding examples of explicit priority
	for each of the two values.
	* dumpfile.h (enum dump_flag): Add comment about the MSG_* flags.
	Rename MSG_ALL to MSG_ALL_KINDS.  Add MSG_PRIORITY_USER_FACING,
	MSG_PRIORITY_INTERNALS, and MSG_ALL_PRIORITIES, updating the
	values for TDF_COMPARE_DEBUG and TDF_ALL_VALUES.
	(AUTO_DUMP_SCOPE): Add a note to the comment about the interaction
	with MSG_PRIORITY_*.
	* tree-vect-loop-manip.c (vect_loop_versioning): Mark versioning
	dump messages as MSG_PRIORITY_USER_FACING.
	* tree-vectorizer.h (DUMP_VECT_SCOPE): Add a note to the comment
	about the interaction with MSG_PRIORITY_*.

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/dump-1.c: Update expected output for test_scopes
	due to "-internals" not being selected.
	* gcc.dg/plugin/dump-2.c: New test, based on dump-1.c, with
	"-internals" added to re-enable the output from test_scopes.
	* gcc.dg/plugin/plugin.exp (plugin_test_list): Add dump-2.c.

From-SVN: r264851

11 files changed, 329 insertions, 98 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0f6cbedbf0c..85e3f3a281c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,45 @@
+2018-10-04  David Malcolm  <dmalcolm@redhat.com>
+
+	* doc/invoke.texi (-fopt-info): Document new "internals"
+	sub-option.
+	* dump-context.h (dump_context::apply_dump_filter_p): New decl.
+	* dumpfile.c (dump_options): Update for renaming of MSG_ALL to
+	MSG_ALL_KINDS.
+	(optinfo_verbosity_options): Add "internals".
+	(kind_as_string): Update for renaming of MSG_ALL to MSG_ALL_KINDS.
+	(dump_context::apply_dump_filter_p): New member function.
+	(dump_context::dump_loc): Use apply_dump_filter_p rather than
+	explicitly masking the dump_kind.
+	(dump_context::begin_scope): Increment the scope depth first.  Use
+	apply_dump_filter_p rather than explicitly masking the dump_kind.
+	(dump_context::emit_item): Use apply_dump_filter_p rather than
+	explicitly masking the dump_kind.
+	(dump_dec): Likewise.
+	(dump_hex): Likewise.
+	(dump_switch_p_1): Default to MSG_ALL_PRIORITIES.
+	(opt_info_switch_p_1): Default to MSG_PRIORITY_USER_FACING.
+	(opt_info_switch_p): Update handling of default
+	MSG_OPTIMIZED_LOCATIONS to cope with default of
+	MSG_PRIORITY_USER_FACING.
+	(dump_basic_block): Use apply_dump_filter_p rather than explicitly
+	masking the dump_kind.
+	(selftest::test_capture_of_dump_calls): Update test_dump_context
+	instances to use MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING rather
+	than MSG_ALL.  Generalize scope test to be run at all four
+	combinations of with/without MSG_PRIORITY_USER_FACING and
+	MSG_PRIORITY_INTERNALS, adding examples of explicit priority
+	for each of the two values.
+	* dumpfile.h (enum dump_flag): Add comment about the MSG_* flags.
+	Rename MSG_ALL to MSG_ALL_KINDS.  Add MSG_PRIORITY_USER_FACING,
+	MSG_PRIORITY_INTERNALS, and MSG_ALL_PRIORITIES, updating the
+	values for TDF_COMPARE_DEBUG and TDF_ALL_VALUES.
+	(AUTO_DUMP_SCOPE): Add a note to the comment about the interaction
+	with MSG_PRIORITY_*.
+	* tree-vect-loop-manip.c (vect_loop_versioning): Mark versioning
+	dump messages as MSG_PRIORITY_USER_FACING.
+	* tree-vectorizer.h (DUMP_VECT_SCOPE): Add a note to the comment
+	about the interaction with MSG_PRIORITY_*.
+
 2018-10-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	* varasm.c (output_constant): Add new parameter merge_strings.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 5179d7064d5..b51a20c0cd6 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -14207,14 +14207,21 @@ Controls optimization dumps from various optimization passes. If the
 @samp{-} separated option keywords to select the dump details and
 optimizations.  
 
-The @var{options} can be divided into two groups: options describing the
-verbosity of the dump, and options describing which optimizations
-should be included. The options from both the groups can be freely
-mixed as they are non-overlapping. However, in case of any conflicts,
+The @var{options} can be divided into three groups:
+@enumerate
+@item
+options describing what kinds of messages should be emitted,
+@item
+options describing the verbosity of the dump, and
+@item
+options describing which optimizations should be included.
+@end enumerate
+The options from each group can be freely mixed as they are
+non-overlapping. However, in case of any conflicts,
 the later options override the earlier options on the command
 line. 
 
-The following options control the dump verbosity:
+The following options control which kinds of messages should be emitted:
 
 @table @samp
 @item optimized
@@ -14233,6 +14240,15 @@ Print detailed optimization information. This includes
 @samp{optimized}, @samp{missed}, and @samp{note}.
 @end table
 
+The following option controls the dump verbosity:
+
+@table @samp
+@item internals
+By default, only ``high-level'' messages are emitted. This option enables
+additional, more detailed, messages, which are likely to only be of interest
+to GCC developers.
+@end table
+
 One or more of the following option keywords can be used to describe a
 group of optimizations:
 
@@ -14253,8 +14269,9 @@ the optimization groups listed above.
 @end table
 
 If @var{options} is
-omitted, it defaults to @samp{optimized-optall}, which means to dump all
-info about successful optimizations from all the passes.  
+omitted, it defaults to @samp{optimized-optall}, which means to dump messages
+about successful optimizations from all the passes, omitting messages
+that are treated as ``internals''.
 
 If the @var{filename} is provided, then the dumps from all the
 applicable optimizations are concatenated into the @var{filename}.
diff --git a/gcc/dump-context.h b/gcc/dump-context.h
index 5b20c15cb8b..20b94a7a93c 100644
--- a/gcc/dump-context.h
+++ b/gcc/dump-context.h
@@ -100,6 +100,8 @@ class dump_context
 
   void emit_item (optinfo_item *item, dump_flags_t dump_kind);
 
+  bool apply_dump_filter_p (dump_flags_t dump_kind, dump_flags_t filter) const;
+
  private:
   optinfo &ensure_pending_optinfo ();
   optinfo &begin_next_optinfo (const dump_location_t &loc);
diff --git a/gcc/dumpfile.c b/gcc/dumpfile.c
index d359e41f750..e15edc7a31c 100644
--- a/gcc/dumpfile.c
+++ b/gcc/dumpfile.c
@@ -141,7 +141,7 @@ static const kv_pair<dump_flags_t> dump_options[] =
   {"optimized", MSG_OPTIMIZED_LOCATIONS},
   {"missed", MSG_MISSED_OPTIMIZATION},
   {"note", MSG_NOTE},
-  {"optall", MSG_ALL},
+  {"optall", MSG_ALL_KINDS},
   {"all", dump_flags_t (TDF_ALL_VALUES
 			& ~(TDF_RAW | TDF_SLIM | TDF_LINENO | TDF_GRAPH
 			    | TDF_STMTADDR | TDF_RHS_ONLY | TDF_NOUID
@@ -157,7 +157,8 @@ static const kv_pair<dump_flags_t> optinfo_verbosity_options[] =
   {"optimized", MSG_OPTIMIZED_LOCATIONS},
   {"missed", MSG_MISSED_OPTIMIZATION},
   {"note", MSG_NOTE},
-  {"all", MSG_ALL},
+  {"all", MSG_ALL_KINDS},
+  {"internals", MSG_PRIORITY_INTERNALS},
   {NULL, TDF_NONE}
 };
 
@@ -449,7 +450,7 @@ dump_user_location_t::from_function_decl (tree fndecl)
 static const char *
 kind_as_string (dump_flags_t dump_kind)
 {
-  switch (dump_kind & MSG_ALL)
+  switch (dump_kind & MSG_ALL_KINDS)
     {
     default:
       gcc_unreachable ();
@@ -524,6 +525,35 @@ dump_context::refresh_dumps_are_enabled ()
 		       || m_test_pp);
 }
 
+/* Determine if a message of kind DUMP_KIND and at the current scope depth
+   should be printed.
+
+   Only show messages that match FILTER both on their kind *and*
+   their priority.  */
+
+bool
+dump_context::apply_dump_filter_p (dump_flags_t dump_kind,
+				   dump_flags_t filter) const
+{
+  /* Few messages, if any, have an explicit MSG_PRIORITY.
+     If DUMP_KIND does, we'll use it.
+     Otherwise, generate an implicit priority value for the message based
+     on the current scope depth.
+     Messages at the top-level scope are MSG_PRIORITY_USER_FACING,
+     whereas those in nested scopes are MSG_PRIORITY_INTERNALS.  */
+  if (!(dump_kind & MSG_ALL_PRIORITIES))
+    {
+      dump_flags_t implicit_priority
+	=  (m_scope_depth > 0
+	    ? MSG_PRIORITY_INTERNALS
+	    : MSG_PRIORITY_USER_FACING);
+      dump_kind |= implicit_priority;
+    }
+
+  return (dump_kind & (filter & MSG_ALL_KINDS)
+	  && dump_kind & (filter & MSG_ALL_PRIORITIES));
+}
+
 /* Print LOC to the appropriate dump destinations, given DUMP_KIND.
    If optinfos are enabled, begin a new optinfo.  */
 
@@ -534,14 +564,14 @@ dump_context::dump_loc (dump_flags_t dump_kind, const dump_location_t &loc)
 
   location_t srcloc = loc.get_location_t ();
 
-  if (dump_file && (dump_kind & pflags))
+  if (dump_file && apply_dump_filter_p (dump_kind, pflags))
     ::dump_loc (dump_kind, dump_file, srcloc);
 
-  if (alt_dump_file && (dump_kind & alt_flags))
+  if (alt_dump_file && apply_dump_filter_p (dump_kind, alt_flags))
     ::dump_loc (dump_kind, alt_dump_file, srcloc);
 
   /* Support for temp_dump_context in selftests.  */
-  if (m_test_pp && (dump_kind & m_test_pp_flags))
+  if (m_test_pp && apply_dump_filter_p (dump_kind, m_test_pp_flags))
     ::dump_loc (dump_kind, m_test_pp, srcloc);
 
   if (optinfo_enabled_p ())
@@ -1067,22 +1097,24 @@ dump_context::get_scope_depth () const
 }
 
 /* Push a nested dump scope.
+   Increment the scope depth.
    Print "=== NAME ===\n" to the dumpfile, if any, and to the -fopt-info
    destination, if any.
-   Emit a "scope" optinfo if optinfos are enabled.
-   Increment the scope depth.  */
+   Emit a "scope" optinfo if optinfos are enabled.  */
 
 void
 dump_context::begin_scope (const char *name, const dump_location_t &loc)
 {
-  if (dump_file && (MSG_NOTE & pflags))
+  m_scope_depth++;
+
+  if (dump_file && apply_dump_filter_p (MSG_NOTE, pflags))
     ::dump_loc (MSG_NOTE, dump_file, loc.get_location_t ());
 
-  if (alt_dump_file && (MSG_NOTE & alt_flags))
+  if (alt_dump_file && apply_dump_filter_p (MSG_NOTE, alt_flags))
     ::dump_loc (MSG_NOTE, alt_dump_file, loc.get_location_t ());
 
   /* Support for temp_dump_context in selftests.  */
-  if (m_test_pp && (MSG_NOTE & m_test_pp_flags))
+  if (m_test_pp && apply_dump_filter_p (MSG_NOTE, m_test_pp_flags))
     ::dump_loc (MSG_NOTE, m_test_pp, loc.get_location_t ());
 
   pretty_printer pp;
@@ -1100,8 +1132,6 @@ dump_context::begin_scope (const char *name, const dump_location_t &loc)
     }
   else
     delete item;
-
-  m_scope_depth++;
 }
 
 /* Pop a nested dump scope.  */
@@ -1155,14 +1185,14 @@ dump_context::end_any_optinfo ()
 void
 dump_context::emit_item (optinfo_item *item, dump_flags_t dump_kind)
 {
-  if (dump_file && (dump_kind & pflags))
+  if (dump_file && apply_dump_filter_p (dump_kind, pflags))
     fprintf (dump_file, "%s", item->get_text ());
 
-  if (alt_dump_file && (dump_kind & alt_flags))
+  if (alt_dump_file && apply_dump_filter_p (dump_kind, alt_flags))
     fprintf (alt_dump_file, "%s", item->get_text ());
 
   /* Support for temp_dump_context in selftests.  */
-  if (m_test_pp && (dump_kind & m_test_pp_flags))
+  if (m_test_pp && apply_dump_filter_p (dump_kind, m_test_pp_flags))
     pp_string (m_test_pp, item->get_text ());
 }
 
@@ -1278,10 +1308,12 @@ template void dump_dec (dump_flags_t, const poly_widest_int &);
 void
 dump_dec (dump_flags_t dump_kind, const poly_wide_int &value, signop sgn)
 {
-  if (dump_file && (dump_kind & pflags))
+  if (dump_file
+      && dump_context::get ().apply_dump_filter_p (dump_kind, pflags))
     print_dec (value, dump_file, sgn);
 
-  if (alt_dump_file && (dump_kind & alt_flags))
+  if (alt_dump_file
+      && dump_context::get ().apply_dump_filter_p (dump_kind, alt_flags))
     print_dec (value, alt_dump_file, sgn);
 }
 
@@ -1290,10 +1322,12 @@ dump_dec (dump_flags_t dump_kind, const poly_wide_int &value, signop sgn)
 void
 dump_hex (dump_flags_t dump_kind, const poly_wide_int &value)
 {
-  if (dump_file && (dump_kind & pflags))
+  if (dump_file
+      && dump_context::get ().apply_dump_filter_p (dump_kind, pflags))
     print_hex (value, dump_file);
 
-  if (alt_dump_file && (dump_kind & alt_flags))
+  if (alt_dump_file
+      && dump_context::get ().apply_dump_filter_p (dump_kind, alt_flags))
     print_hex (value, alt_dump_file);
 }
 
@@ -1698,7 +1732,7 @@ dump_switch_p_1 (const char *arg, struct dump_file_info *dfi, bool doglob)
     return 0;
 
   ptr = option_value;
-  flags = TDF_NONE;
+  flags = MSG_ALL_PRIORITIES;
 
   while (*ptr)
     {
@@ -1794,7 +1828,11 @@ opt_info_switch_p_1 (const char *arg, dump_flags_t *flags,
   ptr = option_value;
 
   *filename = NULL;
-  *flags = TDF_NONE;
+
+  /* Default to filtering out "internals" messages, and retaining
+     "user-facing" messages.  */
+  *flags = MSG_PRIORITY_USER_FACING;
+
   *optgroup_flags = OPTGROUP_NONE;
 
   if (!ptr)
@@ -1883,8 +1921,8 @@ opt_info_switch_p (const char *arg)
     }
 
   file_seen = xstrdup (filename);
-  if (!flags)
-    flags = MSG_OPTIMIZED_LOCATIONS;
+  if (!(flags & MSG_ALL_KINDS))
+    flags |= MSG_OPTIMIZED_LOCATIONS;
   if (!optgroup_flags)
     optgroup_flags = OPTGROUP_ALL;
 
@@ -1896,9 +1934,11 @@ opt_info_switch_p (const char *arg)
 void
 dump_basic_block (dump_flags_t dump_kind, basic_block bb, int indent)
 {
-  if (dump_file && (dump_kind & pflags))
+  if (dump_file
+      && dump_context::get ().apply_dump_filter_p (dump_kind, pflags))
     dump_bb (dump_file, bb, indent, TDF_DETAILS);
-  if (alt_dump_file && (dump_kind & alt_flags))
+  if (alt_dump_file
+      && dump_context::get ().apply_dump_filter_p (dump_kind, alt_flags))
     dump_bb (alt_dump_file, bb, indent, TDF_DETAILS);
 }
 
@@ -2104,7 +2144,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
       /* Test of dump_printf.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_printf (MSG_NOTE, "int: %i str: %s", 42, "foo");
 
 	ASSERT_DUMPED_TEXT_EQ (tmp, "int: 42 str: foo");
@@ -2120,7 +2161,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
       /* Test of dump_printf with %T.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_printf (MSG_NOTE, "tree: %T", integer_zero_node);
 
 	ASSERT_DUMPED_TEXT_EQ (tmp, "tree: 0");
@@ -2137,7 +2179,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
       /* Test of dump_printf with %E.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_printf (MSG_NOTE, "gimple: %E", stmt);
 
 	ASSERT_DUMPED_TEXT_EQ (tmp, "gimple: return;");
@@ -2154,7 +2197,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
       /* Test of dump_printf with %G.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_printf (MSG_NOTE, "gimple: %G", stmt);
 
 	ASSERT_DUMPED_TEXT_EQ (tmp, "gimple: return;\n");
@@ -2176,7 +2220,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 	 - multiple dump-specific format codes: some consecutive, others
 	 separated by text, trailing text after the final one.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_printf_loc (MSG_NOTE, loc, "before %T and %T"
 			 " %i consecutive %E%E after\n",
 			 integer_zero_node, test_decl, 42, stmt, stmt);
@@ -2203,7 +2248,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
       /* Tree, via dump_generic_expr.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_printf_loc (MSG_NOTE, loc, "test of tree: ");
 	dump_generic_expr (MSG_NOTE, TDF_SLIM, integer_zero_node);
 
@@ -2222,7 +2268,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
       /* Tree, via dump_generic_expr_loc.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_generic_expr_loc (MSG_NOTE, loc, TDF_SLIM, integer_one_node);
 
 	ASSERT_DUMPED_TEXT_EQ (tmp, "test.txt:5:10: note: 1");
@@ -2241,7 +2288,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
       {
 	/* dump_gimple_stmt_loc.  */
 	{
-	  temp_dump_context tmp (with_optinfo, MSG_ALL);
+	  temp_dump_context tmp (with_optinfo,
+				 MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	  dump_gimple_stmt_loc (MSG_NOTE, loc, TDF_SLIM, stmt, 2);
 
 	  ASSERT_DUMPED_TEXT_EQ (tmp, "test.txt:5:10: note: return;\n");
@@ -2256,7 +2304,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
 	/* dump_gimple_stmt.  */
 	{
-	  temp_dump_context tmp (with_optinfo, MSG_ALL);
+	  temp_dump_context tmp (with_optinfo,
+				 MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	  dump_gimple_stmt (MSG_NOTE, TDF_SLIM, stmt, 2);
 
 	  ASSERT_DUMPED_TEXT_EQ (tmp, "return;\n");
@@ -2271,7 +2320,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
 	/* dump_gimple_expr_loc.  */
 	{
-	  temp_dump_context tmp (with_optinfo, MSG_ALL);
+	  temp_dump_context tmp (with_optinfo,
+				 MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	  dump_gimple_expr_loc (MSG_NOTE, loc, TDF_SLIM, stmt, 2);
 
 	  ASSERT_DUMPED_TEXT_EQ (tmp, "test.txt:5:10: note: return;");
@@ -2286,7 +2336,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
 	/* dump_gimple_expr.  */
 	{
-	  temp_dump_context tmp (with_optinfo, MSG_ALL);
+	  temp_dump_context tmp (with_optinfo,
+				 MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	  dump_gimple_expr (MSG_NOTE, TDF_SLIM, stmt, 2);
 
 	  ASSERT_DUMPED_TEXT_EQ (tmp, "return;");
@@ -2302,7 +2353,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
       /* poly_int.  */
       {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
+	temp_dump_context tmp (with_optinfo,
+			       MSG_ALL_KINDS | MSG_PRIORITY_USER_FACING);
 	dump_dec (MSG_NOTE, poly_int64 (42));
 
 	ASSERT_DUMPED_TEXT_EQ (tmp, "42");
@@ -2315,45 +2367,92 @@ test_capture_of_dump_calls (const line_table_case &case_)
 	  }
       }
 
-      /* scopes.  */
-      {
-	temp_dump_context tmp (with_optinfo, MSG_ALL);
-	dump_printf_loc (MSG_NOTE, stmt, "msg 1\n");
+      /* Scopes.  Test with all 4 combinations of
+	 filtering by MSG_PRIORITY_USER_FACING
+	 and/or filtering by MSG_PRIORITY_INTERNALS.  */
+      for (int j = 0; j < 3; j++)
 	{
-	  AUTO_DUMP_SCOPE ("outer scope", stmt);
-	  dump_printf_loc (MSG_NOTE, stmt, "msg 2\n");
+	  dump_flags_t dump_filter = MSG_ALL_KINDS;
+	  if (j % 2)
+	    dump_filter |= MSG_PRIORITY_USER_FACING;
+	  if (j / 2)
+	    dump_filter |= MSG_PRIORITY_INTERNALS;
+
+	  temp_dump_context tmp (with_optinfo, dump_filter);
+	  /* Emit various messages, mostly with implicit priority.  */
+	  dump_printf_loc (MSG_NOTE, stmt, "msg 1\n");
+	  dump_printf_loc (MSG_NOTE | MSG_PRIORITY_INTERNALS, stmt,
+			   "explicitly internal msg\n");
 	  {
-	    AUTO_DUMP_SCOPE ("middle scope", stmt);
-	    dump_printf_loc (MSG_NOTE, stmt, "msg 3\n");
+	    AUTO_DUMP_SCOPE ("outer scope", stmt);
+	    dump_printf_loc (MSG_NOTE, stmt, "msg 2\n");
 	    {
-	      AUTO_DUMP_SCOPE ("inner scope", stmt);
-	      dump_printf_loc (MSG_NOTE, stmt, "msg 4\n");
+	      AUTO_DUMP_SCOPE ("middle scope", stmt);
+	      dump_printf_loc (MSG_NOTE, stmt, "msg 3\n");
+	      {
+		AUTO_DUMP_SCOPE ("inner scope", stmt);
+		dump_printf_loc (MSG_NOTE, stmt, "msg 4\n");
+		dump_printf_loc (MSG_NOTE | MSG_PRIORITY_USER_FACING, stmt,
+				 "explicitly user-facing msg\n");
+	      }
+	      dump_printf_loc (MSG_NOTE, stmt, "msg 5\n");
 	    }
-	    dump_printf_loc (MSG_NOTE, stmt, "msg 5\n");
+	    dump_printf_loc (MSG_NOTE, stmt, "msg 6\n");
 	  }
-	  dump_printf_loc (MSG_NOTE, stmt, "msg 6\n");
-	}
-	dump_printf_loc (MSG_NOTE, stmt, "msg 7\n");
+	  dump_printf_loc (MSG_NOTE, stmt, "msg 7\n");
 
-	ASSERT_DUMPED_TEXT_EQ (tmp,
-			       "test.txt:5:10: note: msg 1\n"
-			       "test.txt:5:10: note: === outer scope ===\n"
-			       "test.txt:5:10: note:  msg 2\n"
-			       "test.txt:5:10: note:  === middle scope ===\n"
-			       "test.txt:5:10: note:   msg 3\n"
-			       "test.txt:5:10: note:   === inner scope ===\n"
-			       "test.txt:5:10: note:    msg 4\n"
-			       "test.txt:5:10: note:   msg 5\n"
-			       "test.txt:5:10: note:  msg 6\n"
-			       "test.txt:5:10: note: msg 7\n");
-	if (with_optinfo)
-	  {
-	    optinfo *info = tmp.get_pending_optinfo ();
-	    ASSERT_TRUE (info != NULL);
-	    ASSERT_EQ (info->num_items (), 1);
-	    ASSERT_IS_TEXT (info->get_item (0), "msg 7\n");
-	  }
-      }
+	  switch (dump_filter & MSG_ALL_PRIORITIES)
+	    {
+	    default:
+	      gcc_unreachable ();
+	    case 0:
+	      ASSERT_DUMPED_TEXT_EQ (tmp, "");
+	      break;
+	    case MSG_PRIORITY_USER_FACING:
+	      ASSERT_DUMPED_TEXT_EQ
+		(tmp,
+		 "test.txt:5:10: note: msg 1\n"
+		 "test.txt:5:10: note:    explicitly user-facing msg\n"
+		 "test.txt:5:10: note: msg 7\n");
+	      break;
+	    case MSG_PRIORITY_INTERNALS:
+	      ASSERT_DUMPED_TEXT_EQ
+		(tmp,
+		 "test.txt:5:10: note: explicitly internal msg\n"
+		 "test.txt:5:10: note:  === outer scope ===\n"
+		 "test.txt:5:10: note:  msg 2\n"
+		 "test.txt:5:10: note:   === middle scope ===\n"
+		 "test.txt:5:10: note:   msg 3\n"
+		 "test.txt:5:10: note:    === inner scope ===\n"
+		 "test.txt:5:10: note:    msg 4\n"
+		 "test.txt:5:10: note:   msg 5\n"
+		 "test.txt:5:10: note:  msg 6\n");
+	      break;
+	    case MSG_ALL_PRIORITIES:
+	      ASSERT_DUMPED_TEXT_EQ
+		(tmp,
+		 "test.txt:5:10: note: msg 1\n"
+		 "test.txt:5:10: note: explicitly internal msg\n"
+		 "test.txt:5:10: note: === outer scope ===\n"
+		 "test.txt:5:10: note:  msg 2\n"
+		 "test.txt:5:10: note:  === middle scope ===\n"
+		 "test.txt:5:10: note:   msg 3\n"
+		 "test.txt:5:10: note:   === inner scope ===\n"
+		 "test.txt:5:10: note:    msg 4\n"
+		 "test.txt:5:10: note:    explicitly user-facing msg\n"
+		 "test.txt:5:10: note:   msg 5\n"
+		 "test.txt:5:10: note:  msg 6\n"
+		 "test.txt:5:10: note: msg 7\n");
+	      break;
+	    }
+	  if (with_optinfo)
+	    {
+	      optinfo *info = tmp.get_pending_optinfo ();
+	      ASSERT_TRUE (info != NULL);
+	      ASSERT_EQ (info->num_items (), 1);
+	      ASSERT_IS_TEXT (info->get_item (0), "msg 7\n");
+	    }
+	}
     }
 
   /* Verify that MSG_* affects optinfo->get_kind (); we tested MSG_NOTE
@@ -2361,7 +2460,7 @@ test_capture_of_dump_calls (const line_table_case &case_)
   {
     /* MSG_OPTIMIZED_LOCATIONS.  */
     {
-      temp_dump_context tmp (true, MSG_ALL);
+      temp_dump_context tmp (true, MSG_ALL_KINDS);
       dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loc, "test");
       ASSERT_EQ (tmp.get_pending_optinfo ()->get_kind (),
 		 OPTINFO_KIND_SUCCESS);
@@ -2369,7 +2468,7 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
     /* MSG_MISSED_OPTIMIZATION.  */
     {
-      temp_dump_context tmp (true, MSG_ALL);
+      temp_dump_context tmp (true, MSG_ALL_KINDS);
       dump_printf_loc (MSG_MISSED_OPTIMIZATION, loc, "test");
       ASSERT_EQ (tmp.get_pending_optinfo ()->get_kind (),
 		 OPTINFO_KIND_FAILURE);
@@ -2378,7 +2477,8 @@ test_capture_of_dump_calls (const line_table_case &case_)
 
   /* Verify that MSG_* affect AUTO_DUMP_SCOPE and the dump calls.  */
   {
-    temp_dump_context tmp (false, MSG_OPTIMIZED_LOCATIONS);
+    temp_dump_context tmp (false,
+			   MSG_OPTIMIZED_LOCATIONS | MSG_ALL_PRIORITIES);
     dump_printf_loc (MSG_NOTE, stmt, "msg 1\n");
     {
       AUTO_DUMP_SCOPE ("outer scope", stmt);
diff --git a/gcc/dumpfile.h b/gcc/dumpfile.h
index 057ca46746e..59339057c1b 100644
--- a/gcc/dumpfile.h
+++ b/gcc/dumpfile.h
@@ -145,6 +145,9 @@ enum dump_flag
   /* Dump folding details.  */
   TDF_FOLDING = (1 << 21),
 
+  /* MSG_* flags for expressing the kinds of message to
+     be emitted by -fopt-info.  */
+
   /* -fopt-info optimized sources.  */
   MSG_OPTIMIZED_LOCATIONS = (1 << 22),
 
@@ -154,15 +157,37 @@ enum dump_flag
   /* General optimization info.  */
   MSG_NOTE = (1 << 24),
 
-  MSG_ALL = (MSG_OPTIMIZED_LOCATIONS
-	     | MSG_MISSED_OPTIMIZATION
-	     | MSG_NOTE),
+  /* Mask for selecting MSG_-kind flags.  */
+  MSG_ALL_KINDS = (MSG_OPTIMIZED_LOCATIONS
+		   | MSG_MISSED_OPTIMIZATION
+		   | MSG_NOTE),
+
+  /* MSG_PRIORITY_* flags for expressing the priority levels of message
+     to be emitted by -fopt-info, and filtering on them.
+     By default, messages at the top-level dump scope are "user-facing",
+     whereas those that are in nested scopes are implicitly "internals".
+     This behavior can be overridden for a given dump message by explicitly
+     specifying one of the MSG_PRIORITY_* flags.
+
+     By default, dump files show both kinds of message, whereas -fopt-info
+     only shows "user-facing" messages, and requires the "-internals"
+     sub-option of -fopt-info to show the internal messages.  */
+
+  /* Implicitly supplied for messages at the top-level dump scope.  */
+  MSG_PRIORITY_USER_FACING = (1 << 25),
+
+  /* Implicitly supplied for messages within nested dump scopes.  */
+  MSG_PRIORITY_INTERNALS = (1 << 26),
+
+  /* Mask for selecting MSG_PRIORITY_* flags.  */
+  MSG_ALL_PRIORITIES = (MSG_PRIORITY_USER_FACING
+			| MSG_PRIORITY_INTERNALS),
 
   /* Dumping for -fcompare-debug.  */
-  TDF_COMPARE_DEBUG = (1 << 25),
+  TDF_COMPARE_DEBUG = (1 << 27),
 
   /* All values.  */
-  TDF_ALL_VALUES = (1 << 26) - 1
+  TDF_ALL_VALUES = (1 << 28) - 1
 };
 
 /* Dump flags type.  */
@@ -549,7 +574,11 @@ class auto_dump_scope
    and then calling
      dump_end_scope ();
    once the object goes out of scope, thus capturing the nesting of
-   the scopes.  */
+   the scopes.
+
+   These scopes affect dump messages within them: dump messages at the
+   top level implicitly default to MSG_PRIORITY_USER_FACING, whereas those
+   in a nested scope implicitly default to MSG_PRIORITY_INTERNALS.  */
 
 #define AUTO_DUMP_SCOPE(NAME, LOC) \
   auto_dump_scope scope (NAME, LOC)
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f15042f64b0..f410171a370 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2018-10-04  David Malcolm  <dmalcolm@redhat.com>
+
+	* gcc.dg/plugin/dump-1.c: Update expected output for test_scopes
+	due to "-internals" not being selected.
+	* gcc.dg/plugin/dump-2.c: New test, based on dump-1.c, with
+	"-internals" added to re-enable the output from test_scopes.
+	* gcc.dg/plugin/plugin.exp (plugin_test_list): Add dump-2.c.
+
 2018-10-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	* gnat.dg/string_merge1.adb: New test.
diff --git a/gcc/testsuite/gcc.dg/plugin/dump-1.c b/gcc/testsuite/gcc.dg/plugin/dump-1.c
index 165a9c1cd0b..95bd7a4224d 100644
--- a/gcc/testsuite/gcc.dg/plugin/dump-1.c
+++ b/gcc/testsuite/gcc.dg/plugin/dump-1.c
@@ -18,11 +18,7 @@ void test_remarks (void)
   test_wide_int (); /* { dg-message "test of wide int: 0" } */
   test_poly_int (); /* { dg-message "test of poly int: 42" } */
 
-  test_scopes (); /* { dg-line test_scopes_line } */
-  /* { dg-message "=== outer scope ===" "" { target *-*-* } test_scopes_line } */
-  /* { dg-message " at outer scope" "" { target *-*-* } test_scopes_line } */
-  /* { dg-message " === middle scope ===" "" { target *-*-* } test_scopes_line } */
-  /* { dg-message "  at middle scope" "" { target *-*-* } test_scopes_line } */
-  /* { dg-message "  === innermost scope ===" "" { target *-*-* } test_scopes_line } */
-  /* { dg-message "   at innermost scope" "" { target *-*-* } test_scopes_line } */
+  /* Dump messages in nested scopes are not printed by default, and
+     require "-internals".  */
+  test_scopes ();
 }
diff --git a/gcc/testsuite/gcc.dg/plugin/dump-2.c b/gcc/testsuite/gcc.dg/plugin/dump-2.c
new file mode 100644
index 00000000000..961a3d3c02a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/plugin/dump-2.c
@@ -0,0 +1,30 @@
+/* { dg-do compile } */
+/* { dg-options "-fopt-info-note-internals" } */
+
+extern void test_string_literal (void);
+extern void test_tree (void);
+extern void test_gimple (int);
+extern void test_cgraph_node (void);
+extern void test_wide_int (void);
+extern void test_poly_int (void);
+extern void test_scopes (void);
+
+void test_remarks (void)
+{
+  test_string_literal (); /* { dg-message "test of dump for 'test_string_literal'" } */
+  test_tree (); /* { dg-message "test of tree: 0" } */
+  test_gimple (42); /* { dg-message "test of gimple: test_gimple \\(42\\);" } */
+  test_cgraph_node (); /* { dg-message "test of callgraph node: test_cgraph_node/\[0-9\]+" } */
+  test_wide_int (); /* { dg-message "test of wide int: 0" } */
+  test_poly_int (); /* { dg-message "test of poly int: 42" } */
+
+  /* Dump messages in nested scopes are not printed by default, and
+     require "-internals".  */
+  test_scopes (); /* { dg-line test_scopes_line } */
+  /* { dg-message "=== outer scope ===" "" { target *-*-* } test_scopes_line } */
+  /* { dg-message " at outer scope" "" { target *-*-* } test_scopes_line } */
+  /* { dg-message " === middle scope ===" "" { target *-*-* } test_scopes_line } */
+  /* { dg-message "  at middle scope" "" { target *-*-* } test_scopes_line } */
+  /* { dg-message "  === innermost scope ===" "" { target *-*-* } test_scopes_line } */
+  /* { dg-message "   at innermost scope" "" { target *-*-* } test_scopes_line } */
+}
diff --git a/gcc/testsuite/gcc.dg/plugin/plugin.exp b/gcc/testsuite/gcc.dg/plugin/plugin.exp
index 50db3ae77ad..1d06c04562e 100644
--- a/gcc/testsuite/gcc.dg/plugin/plugin.exp
+++ b/gcc/testsuite/gcc.dg/plugin/plugin.exp
@@ -102,7 +102,8 @@ set plugin_test_list [list \
     { expensive_selftests_plugin.c \
 	  expensive-selftests-1.c } \
     { dump_plugin.c \
-	  dump-1.c } \
+	  dump-1.c \
+	  dump-2.c } \
 ]
 
 foreach plugin_test $plugin_test_list {
diff --git a/gcc/tree-vect-loop-manip.c b/gcc/tree-vect-loop-manip.c
index a93c6eecb52..1d1d1147696 100644
--- a/gcc/tree-vect-loop-manip.c
+++ b/gcc/tree-vect-loop-manip.c
@@ -3068,11 +3068,13 @@ vect_loop_versioning (loop_vec_info loop_vinfo,
       && dump_enabled_p ())
     {
       if (version_alias)
-        dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
+        dump_printf_loc (MSG_OPTIMIZED_LOCATIONS | MSG_PRIORITY_USER_FACING,
+			 vect_location,
                          "loop versioned for vectorization because of "
 			 "possible aliasing\n");
       if (version_align)
-        dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
+        dump_printf_loc (MSG_OPTIMIZED_LOCATIONS | MSG_PRIORITY_USER_FACING,
+			 vect_location,
                          "loop versioned for vectorization to enhance "
 			 "alignment\n");
 
diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h
index d91cc075f0e..af5d5bf2b36 100644
--- a/gcc/tree-vectorizer.h
+++ b/gcc/tree-vectorizer.h
@@ -1420,7 +1420,11 @@ extern dump_user_location_t vect_location;
    and then calling
      dump_end_scope ();
    once the object goes out of scope, thus capturing the nesting of
-   the scopes.  */
+   the scopes.
+
+   These scopes affect dump messages within them: dump messages at the
+   top level implicitly default to MSG_PRIORITY_USER_FACING, whereas those
+   in a nested scope implicitly default to MSG_PRIORITY_INTERNALS.  */
 
 #define DUMP_VECT_SCOPE(MSG) \
   AUTO_DUMP_SCOPE (MSG, vect_location)