[PATCH V2] Improve user experience in printing Fortran derived types.

[Walfred Tedeschi <walfred.tedeschi@intel.com>]

Output for Fortran derived classes is like:

  "( 9, 'abc')"

with this changes the output is changed to:

  "( lucky_number = 9, letters = 'abc')"

2016-03-08  Walfred Tedeschi  <walfred.tedeschi@intel.com>

	* f-valprint.c (f_val_print): Add field names for printing
	derived types fields.

gdb/testsuite:

	* gdb.fortran/derived-type.exp (print q): Add fields to the output.

---
 gdb/f-valprint.c                           | 38 +++++++++++++++++++++++-------
 gdb/testsuite/gdb.fortran/derived-type.exp |  6 ++---
 2 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/gdb/f-valprint.c b/gdb/f-valprint.c
index 1438fc6..13c7237 100644
--- a/gdb/f-valprint.c
+++ b/gdb/f-valprint.c
@@ -260,6 +260,7 @@ f_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
   struct gdbarch *gdbarch = get_type_arch (type);
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   unsigned int i = 0;	/* Number of characters printed.  */
+  int printed_field = 0; /* Number of fields printed.  */
   struct type *elttype;
   CORE_ADDR addr;
   int index;
@@ -375,15 +376,34 @@ f_val_print (struct type *type, const gdb_byte *valaddr, int embedded_offset,
       fprintf_filtered (stream, "( ");
       for (index = 0; index < TYPE_NFIELDS (type); index++)
         {
-          int offset = TYPE_FIELD_BITPOS (type, index) / 8;
-
-          val_print (TYPE_FIELD_TYPE (type, index), valaddr,
-		     embedded_offset + offset,
-		     address, stream, recurse + 1,
-		     original_value, options, current_language);
-          if (index != TYPE_NFIELDS (type) - 1)
-            fputs_filtered (", ", stream);
-        }
+	  struct value *field = value_field
+	    ((struct value *)original_value, index);
+	  struct type *field_type = check_typedef (TYPE_FIELD_TYPE (type, index));
+
+
+	  if (TYPE_CODE (field_type) != TYPE_CODE_FUNC)
+	    {
+	      const char *field_name;
+
+	      if (printed_field > 0)
+		fputs_filtered (", ", stream);
+
+	      field_name = TYPE_FIELD_NAME (type, index);
+	      if (field_name != NULL)
+		{
+		  fputs_filtered (field_name, stream);
+		  fputs_filtered (" = ", stream);
+		}
+
+	      val_print (value_type (field),
+			 value_contents_for_printing (field),
+			 value_embedded_offset (field),
+			 value_address (field), stream, recurse + 1,
+			 field, options, current_language);
+
+	      ++printed_field;
+	    }
+	 }
       fprintf_filtered (stream, " )");
       break;     
 
diff --git a/gdb/testsuite/gdb.fortran/derived-type.exp b/gdb/testsuite/gdb.fortran/derived-type.exp
index f7f10b5..f650352 100644
--- a/gdb/testsuite/gdb.fortran/derived-type.exp
+++ b/gdb/testsuite/gdb.fortran/derived-type.exp
@@ -54,7 +54,7 @@ gdb_test_multiple "ptype q" $test {
 gdb_breakpoint [gdb_get_line_number "print"]
 gdb_continue_to_breakpoint "print"
 
-gdb_test "print p" "\\$\[0-9\]+ = \\( 1, 2\\.375 \\)"
+gdb_test "print p" "\\$\[0-9\]+ = \\( c = 1, d = 2\\.375 \\)"
 gdb_test "print p%c" "\\$\[0-9\]+ = 1"
 gdb_test "print p%d" "\\$\[0-9\]+ = 2\\.375"
 gdb_test "print q%a" "\\$\[0-9\]+ = 3\\.125"
@@ -76,10 +76,10 @@ gdb_test "print q%x%d" "\\$\[0-9\]+ = 2\\.375"
 
 set test "print q"
 gdb_test_multiple $test $test {
-    -re "\\$\[0-9\]+ = \\( 3.125, \\( 1, 2\\.375 \\), 'abcdefg' \\)\r\n$gdb_prompt $" {
+    -re "\\$\[0-9\]+ = \\( a = 3.125, x = \\( c = 1, d = 2\\.375 \\), b = 'abcdefg' \\)\r\n$gdb_prompt $" {
 	pass $test
     }
-    -re "\\$\[0-9\]+ = \\( 3.125, \\( 1, 2\\.375 \\), \\(97 'a', 98 'b', 99 'c', 100 'd', 101 'e', 102 'f', 103 'g'\\) \\)\r\n$gdb_prompt $" {
+    -re "\\$\[0-9\]+ = \\( a = 3.125, x = \\( 1, 2\\.375 \\), b = \\('abcdefg'\\) \\)\r\n$gdb_prompt $" {
 	# Compiler should produce string, not an array of characters.
 	setup_xfail "*-*-*"
 	fail $test
-- 
2.1.4