dumpfile.c: add indentation via DUMP_VECT_SCOPE

This patch adds a concept of nested "scopes" to dumpfile.c's dump_*_loc
calls, and wires it up to the DUMP_VECT_SCOPE macro in tree-vectorizer.h,
so that the nested structure is shown in -fopt-info by indentation.

For example, this converts -fopt-info-all e.g. from:

test.c:8:3: note: === analyzing loop ===
test.c:8:3: note: === analyze_loop_nest ===
test.c:8:3: note: === vect_analyze_loop_form ===
test.c:8:3: note: === get_loop_niters ===
test.c:8:3: note: symbolic number of iterations is (unsigned int) n_9(D)
test.c:8:3: note: not vectorized: loop contains function calls or data references that cannot be analyzed
test.c:8:3: note: vectorized 0 loops in function

to:

test.c:8:3: note: === analyzing loop ===
test.c:8:3: note:  === analyze_loop_nest ===
test.c:8:3: note:   === vect_analyze_loop_form ===
test.c:8:3: note:    === get_loop_niters ===
test.c:8:3: note:   symbolic number of iterations is (unsigned int) n_9(D)
test.c:8:3: note:   not vectorized: loop contains function calls or data references that cannot be analyzed
test.c:8:3: note: vectorized 0 loops in function

showing that the "symbolic number of iterations" message is within
the "=== analyze_loop_nest ===" (and not within the
"=== vect_analyze_loop_form ===").

This is also enabling work for followups involving optimization records
(allowing the records to directly capture the nested structure of the
dump messages).

gcc/ChangeLog:
	* dumpfile.c (dump_loc): Add indentation based on scope depth.
	(dump_scope_depth): New variable.
	(get_dump_scope_depth): New function.
	(dump_begin_scope): New function.
	(dump_end_scope): New function.
	* dumpfile.h (get_dump_scope_depth): New declaration.
	(dump_begin_scope): New declaration.
	(dump_end_scope): New declaration.
	(class auto_dump_scope): New class.
	(AUTO_DUMP_SCOPE): New macro.
	* tree-vectorizer.h (DUMP_VECT_SCOPE): Reimplement in terms of
	AUTO_DUMP_SCOPE.

From-SVN: r262246

1 files changed, 8 insertions, 7 deletions

diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h
index 94a0f38..a8406b3 100644
--- a/gcc/tree-vectorizer.h
+++ b/gcc/tree-vectorizer.h
@@ -1440,15 +1440,16 @@ vect_get_scalar_dr_size (struct data_reference *dr)
 /* Source location + hotness information. */
 extern dump_user_location_t vect_location;
 
-/* If dumping is enabled, emit a MSG_NOTE at vect_location about
-   entering MSG within the vectorizer.  MSG should be a string literal. */
+/* A macro for calling:
+     dump_begin_scope (MSG, vect_location);
+   via an RAII object, thus printing "=== MSG ===\n" to the dumpfile etc,
+   and then calling
+     dump_end_scope ();
+   once the object goes out of scope, thus capturing the nesting of
+   the scopes.  */
 
 #define DUMP_VECT_SCOPE(MSG) \
-  do {						\
-    if (dump_enabled_p ())			\
-      dump_printf_loc (MSG_NOTE, vect_location, \
-		       "=== " MSG " ===\n");	\
-  } while (0)
+  AUTO_DUMP_SCOPE (MSG, vect_location)
 
 /*-----------------------------------------------------------------*/
 /* Function prototypes.                                            */