gdb: Support printf 'z' size modifier

The gdb format mechanism doesn't currently support the 'z' size
modifier, there are a few places in GDB where this is used.  Instead
of removing these uses lets just add support to GDB for using 'z'.

I found this issue when trying to use some of the debug output.
Before this commit:

  (gdb) set debug dwarf-line 9
  (gdb) file test
  Reading symbols from test...
  Unrecognized format specifier 'z' in printf
  (No debugging symbols found in test)
  (gdb)

After this commit:

  (gdb) set debug dwarf-line 9
  (gdb) file test
  Reading symbols from test...
  Adding dir 1: /usr/include
  Adding file 1: test.c
  Adding file 2: stdc-predef.h
  Processing actual line 3: file 1, address 0x4004a0, is_stmt 1, discrim 0
  Processing actual line 4: file 1, address 0x4004a0, is_stmt 1, discrim 0
  .... lots of debug output ...
  Processing actual line 10: file 1, address 0x4003b7, is_stmt 0, discrim 0
  (gdb)

I've added a self test to cover the integer format size modifiers,
including the 'z' modifier.

gdb/ChangeLog:

	* gdbsupport/format.c (format_pieces::format_pieces): Support
	printf 'z' size modifier.
	* gdbsupport/format.h (enum argclass): Add size_t_arg.
	* printcmd.c (ui_printf):  Handle size_t_arg.
	* ui-out.c (ui_out::vmessage): Likewise.
	* unittests/format_pieces-selftests.c (test_format_int_sizes): New
	function.
	(run_tests): Call test_format_int_sizes.

gdb/gdbserver/ChangeLog:

	* ax.c (ax_printf): Handle size_t_arg.

Change-Id: Ib6c44d88aa5bce265d757e4c0698881803dd186f

1 files changed, 44 insertions, 0 deletions

diff --git a/gdb/unittests/format_pieces-selftests.c b/gdb/unittests/format_pieces-selftests.c
index ed83d96..3971201 100644
--- a/gdb/unittests/format_pieces-selftests.c
+++ b/gdb/unittests/format_pieces-selftests.c
@@ -76,12 +76,56 @@ test_gdb_formats ()
     }, true);
 }
 
+/* Test the different size modifiers that can be applied to an integer
+   argument.  Test with different integer format specifiers too.  */
+
+static void
+test_format_int_sizes ()
+{
+  check ("Hello\\t %hu%lu%llu%zu", /* ARI: %ll */
+    {
+      format_piece ("Hello\t ", literal_piece, 0),
+      format_piece ("%hu", int_arg, 0),
+      format_piece ("%lu", long_arg, 0),
+      format_piece ("%llu", long_long_arg, 0), /* ARI: %ll */
+      format_piece ("%zu", size_t_arg, 0)
+    });
+
+  check ("Hello\\t %hx%lx%llx%zx", /* ARI: %ll */
+    {
+      format_piece ("Hello\t ", literal_piece, 0),
+      format_piece ("%hx", int_arg, 0),
+      format_piece ("%lx", long_arg, 0),
+      format_piece ("%llx", long_long_arg, 0), /* ARI: %ll */
+      format_piece ("%zx", size_t_arg, 0)
+    });
+
+  check ("Hello\\t %ho%lo%llo%zo", /* ARI: %ll */
+    {
+      format_piece ("Hello\t ", literal_piece, 0),
+      format_piece ("%ho", int_arg, 0),
+      format_piece ("%lo", long_arg, 0),
+      format_piece ("%llo", long_long_arg, 0), /* ARI: %ll */
+      format_piece ("%zo", size_t_arg, 0)
+    });
+
+  check ("Hello\\t %hd%ld%lld%zd", /* ARI: %ll */
+    {
+      format_piece ("Hello\t ", literal_piece, 0),
+      format_piece ("%hd", int_arg, 0),
+      format_piece ("%ld", long_arg, 0),
+      format_piece ("%lld", long_long_arg, 0), /* ARI: %ll */
+      format_piece ("%zd", size_t_arg, 0)
+    });
+}
+
 static void
 run_tests ()
 {
   test_escape_sequences ();
   test_format_specifier ();
   test_gdb_formats ();
+  test_format_int_sizes ();
 }
 
 } /* namespace format_pieces */