tracetool: Add support for the 'simple' backend

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

scripts/tracetool/backend/simple.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Simple 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 "trace/simple.h"',
+        '')
+
+    for num, e in enumerate(events):
+        if len(e.args):
+            argstr = e.args.names()
+            arg_prefix = ', (uint64_t)(uintptr_t)'
+            cast_args = arg_prefix + arg_prefix.join(argstr)
+            simple_args = (str(num) + cast_args)
+        else:
+            simple_args = str(num)
+
+        out('static inline void trace_%(name)s(%(args)s)',
+            '{',
+            '    trace%(argc)d(%(trace_args)s);',
+            '}',
+            name = e.name,
+            args = e.args,
+            argc = len(e.args),
+            trace_args = simple_args,
+            )
+
+    out('#define NR_TRACE_EVENTS %d' % len(events))
+    out('extern TraceEvent trace_list[NR_TRACE_EVENTS];')