Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 72 insertions, 0 deletions

diff --git a/scripts/tracetool/format/c.py b/scripts/tracetool/format/c.py
new file mode 100644
index 000000000..c390c1844
--- /dev/null
+++ b/scripts/tracetool/format/c.py
@@ -0,0 +1,72 @@
+# -*- coding: utf-8 -*-
+
+"""
+trace/generated-tracers.c
+"""
+
+__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012-2014, Lluís Vilanova <vilanova@ac.upc.edu>"
+__license__    = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__      = "stefanha@redhat.com"
+
+
+from tracetool import out
+
+
+def generate(events, backend, group):
+    active_events = [e for e in events
+                     if "disable" not in e.properties]
+
+    header = "trace-" + group + ".h"
+
+    out('/* This file is autogenerated by tracetool, do not edit. */',
+        '',
+        '#include "qemu/osdep.h"',
+        '#include "qemu/module.h"',
+        '#include "%s"' % header,
+        '')
+
+    for e in events:
+        out('uint16_t %s;' % e.api(e.QEMU_DSTATE))
+
+    for e in events:
+        if "vcpu" in e.properties:
+            vcpu_id = 0
+        else:
+            vcpu_id = "TRACE_VCPU_EVENT_NONE"
+        out('TraceEvent %(event)s = {',
+            '    .id = 0,',
+            '    .vcpu_id = %(vcpu_id)s,',
+            '    .name = \"%(name)s\",',
+            '    .sstate = %(sstate)s,',
+            '    .dstate = &%(dstate)s ',
+            '};',
+            event = e.api(e.QEMU_EVENT),
+            vcpu_id = vcpu_id,
+            name = e.name,
+            sstate = "TRACE_%s_ENABLED" % e.name.upper(),
+            dstate = e.api(e.QEMU_DSTATE))
+
+    out('TraceEvent *%(group)s_trace_events[] = {',
+        group = group.lower())
+
+    for e in events:
+        out('    &%(event)s,', event = e.api(e.QEMU_EVENT))
+
+    out('  NULL,',
+        '};',
+        '')
+
+    out('static void trace_%(group)s_register_events(void)',
+        '{',
+        '    trace_event_register_group(%(group)s_trace_events);',
+        '}',
+        'trace_init(trace_%(group)s_register_events)',
+        group = group.lower())
+
+    backend.generate_begin(active_events, group)
+    for event in active_events:
+        backend.generate(event, group)
+    backend.generate_end(active_events, group)