Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
---
scripts/tracetool/backend/plugin.py | 79 +++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
create mode 100644 scripts/tracetool/backend/plugin.py
diff --git a/scripts/tracetool/backend/plugin.py
b/scripts/tracetool/backend/plugin.py
new file mode 100644
index 0000000000..d96b2df00a
--- /dev/null
+++ b/scripts/tracetool/backend/plugin.py
@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Plugin backend.
+"""
+
+__author__ = "Alex Bennée <alex.ben...@linaro.org>"
+__copyright__ = "Copyright 2018, Alex Bennée <alex.ben...@linaro.org>"
+__license__ = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Alex Bennée"
+__email__ = "alex.ben...@linaro.org"
+
+
+from tracetool import out
+
+
+PUBLIC = True
+
+
+def generate_h_begin(events, group):
+ for event in events:
+ # prototype for plugin event
+ out('bool _plugin_%(api)s(%(args)s);',
+ api=event.api(),
+ args=event.args)
+ # prototype for plugin fn
+ out("typedef bool (* _plugin_%(api)s_fn)(%(args)s);",
+ api=event.api(),
+ args=event.args)
+
+
+def generate_h(event, group):
+ out(' if (!_plugin_%(api)s(%(args)s)) {',
+ ' return;',
+ ' };',
+ api=event.api(),
+ args=", ".join(event.args.names()))
+
+def generate_c_begin(events, group):
+ out('#include "qemu/osdep.h"',
+ '#include "trace/control.h"',
+ '')
+
+def generate_c(event, group):
+ out('bool _plugin_%(api)s(%(args)s)',
+ '{',
+ api=event.api(),
+ args=event.args)
+
+ event_id = 'TRACE_' + event.name.upper()
+ cond = "trace_event_get_state(%s)" % event_id
+
+ # Forst the pre-amble, bail early if the event is not enabled and
+ # if it is but no plugin is enabled let the reset of the events proceed.
+
+ out('',
+ ' if (!%(cond)s) {',
+ ' return false;',
+ ' }',
+ '',
+ ' uintptr_t fp = trace_event_get_plugin(&_%(event)s_EVENT);',
+ ' if (!fp) {',
+ ' return true;',
+ ' }',
+ '',
+ cond=cond,
+ event=event_id)
+
+ # We need to construct cast to the correct fn pointer to now call the
plugin
+
+ out('',
+ ' _plugin_%(api)s_fn plug_fn = (_plugin_%(api)s_fn) fp;',
+ ' return plug_fn(%(names)s);',
+ '}',
+ '',
+ api=event.api(),
+ names=", ".join(event.args.names()))
--
2.17.1
