gdb: add debug_prefixed_vprintf

To help ensure that all debug statements have the same format, introduce
the debug_prefixed_vprintf helper.  Implement linux_nat_debug_printf_1
and infrun_debug_printf_1 with it.

I would eventually like to style the module and function name with some
color, to help them stick out, but I don't really know how to do that
yet, it can always be done later.

gdb/ChangeLog:

	* debug.h: New file.
	* debug.c (debug_prefixed_vprintf): New function.
	* infrun.c (infrun_debug_printf_1): Use debug_prefixed_vprintf.
	* linux-nat.c (linux_nat_debug_printf_1): Likewise.

Change-Id: Iccc290a2dc6b5fffcbe1c2866ed8d804ad380764

1 files changed, 32 insertions, 0 deletions

diff --git a/gdb/debug.h b/gdb/debug.h
new file mode 100644
index 0000000..1d98fbe
--- /dev/null
+++ b/gdb/debug.h
@@ -0,0 +1,32 @@
+/* Helpers to format and print debug statements
+
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef DEBUG_H
+#define DEBUG_H
+
+/* Print a debug statement prefixed with the module and function name, and
+   with a newline at the end.  */
+
+void ATTRIBUTE_PRINTF (3, 0)
+debug_prefixed_vprintf (const char *module, const char *func, const char *format,
+			va_list args);
+
+#endif /* DEBUG_H */
+
+