tracetool: Add support for the 'stderr' backend

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

scripts/tracetool/backend/stderr.py

@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Stderr built-in backend.
+"""
+
+__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012, Lluís Vilanova <vilanova@ac.upc.edu>"
+__license__    = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__      = "stefanha@linux.vnet.ibm.com"
+
+
+from tracetool import out
+
+
+def c(events):
+    out('#include "trace.h"',
+        '',
+        'TraceEvent trace_list[] = {')
+
+    for e in events:
+        out('{.tp_name = "%(name)s", .state=0},',
+            name = e.name,
+            )
+
+    out('};')
+
+def h(events):
+    out('#include <stdio.h>',
+        '#include "trace/stderr.h"',
+        '',
+        'extern TraceEvent trace_list[];')
+
+    for num, e in enumerate(events):
+        argnames = ", ".join(e.args.names())
+        if len(e.args) > 0:
+            argnames = ", " + argnames
+
+        out('static inline void trace_%(name)s(%(args)s)',
+            '{',
+            '    if (trace_list[%(event_num)s].state != 0) {',
+            '        fprintf(stderr, "%(name)s " %(fmt)s "\\n" %(argnames)s);',
+            '    }',
+            '}',
+            name = e.name,
+            args = e.args,
+            event_num = num,
+            fmt = e.fmt,
+            argnames = argnames,
+            )
+
+    out('',
+        '#define NR_TRACE_EVENTS %d' % len(events))