[PATCH 2/2] scripts/tracetool: Add plainlog backend

[BALATON Zoltan <balaton@eik.bme.hu>]

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Add a backend that is the same as the log backend but omits the
process id and timestamp so logs are easier to read and diff-able.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
 scripts/tracetool/backend/plainlog.py | 48 +++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 scripts/tracetool/backend/plainlog.py

diff --git a/scripts/tracetool/backend/plainlog.py b/scripts/tracetool/backend/plainlog.py
new file mode 100644
index 0000000000..40bbfa6d76
--- /dev/null
+++ b/scripts/tracetool/backend/plainlog.py
@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+
+"""
+Stderr built-in backend, plain log without proc ID and time.
+"""
+
+__author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
+__copyright__  = "Copyright 2012-2017, 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
+
+
+PUBLIC = True
+
+
+def generate_h_begin(events, group):
+    out('#include "qemu/log-for-trace.h"',
+        '')
+
+
+def generate_h(event, group):
+    argnames = ", ".join(event.args.names())
+    if len(event.args) > 0:
+        argnames = ", " + argnames
+
+    if "vcpu" in event.properties:
+        # already checked on the generic format code
+        cond = "true"
+    else:
+        cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper())
+
+    out('    if (%(cond)s && qemu_loglevel_mask(LOG_TRACE)) {',
+        '        qemu_log("%(name)s " %(fmt)s "\\n" %(argnames)s);',
+        '    }',
+        cond=cond,
+        name=event.name,
+        fmt=event.fmt.rstrip("\n"),
+        argnames=argnames)
+
+
+def generate_h_backend_dstate(event, group):
+    out('    trace_event_get_state_dynamic_by_id(%(event_id)s) || \\',
+        event_id="TRACE_" + event.name.upper())
-- 
2.21.3