From 45be2f5d0dcdd314cd0c70a11220e5e09a44d654 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Llu=C3=ADs=20Vilanova?= <vilanova@ac.upc.edu>
Date: Tue, 5 Mar 2013 14:47:32 +0100
Subject: trace: Provide a generic tracing event descriptor
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Uses tracetool to generate a backend-independent tracing event description
(struct TraceEvent).

The values for such structure are generated with the non-public "events"
backend ("events-c" frontend).

The generation of the defines to check if an event is statically enabled is also
moved to the "events" backend ("events-h" frontend).

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 trace/Makefile.objs    | 24 +++++++++++++++++++++++-
 trace/event-internal.h | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 trace/event-internal.h

(limited to 'trace')

diff --git a/trace/Makefile.objs b/trace/Makefile.objs
index dde9d5784e..156aa250aa 100644
--- a/trace/Makefile.objs
+++ b/trace/Makefile.objs
@@ -1,7 +1,29 @@
 # -*- mode: makefile -*-
 
 ######################################################################
-# Auto-generated header for tracing routines
+# Auto-generated event descriptions
+
+$(obj)/generated-events.h: $(obj)/generated-events.h-timestamp
+$(obj)/generated-events.h-timestamp: $(SRC_PATH)/trace-events
+	$(call quiet-command,$(TRACETOOL) \
+		--format=events-h \
+		--backend=events \
+		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
+	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
+
+$(obj)/generated-events.c: $(obj)/generated-events.c-timestamp
+$(obj)/generated-events.c-timestamp: $(SRC_PATH)/trace-events
+	$(call quiet-command,$(TRACETOOL) \
+		--format=events-c \
+		--backend=events \
+		< $< > $@,"  GEN   $(patsubst %-timestamp,%,$@)")
+	@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst %-timestamp,%,$@)
+
+util-obj-y += generated-events.o
+
+
+######################################################################
+# Auto-generated tracing routines
 
 $(obj)/generated-tracers.h: $(obj)/generated-tracers.h-timestamp
 	@cmp -s $< $@ || cp $< $@
diff --git a/trace/event-internal.h b/trace/event-internal.h
new file mode 100644
index 0000000000..b2310d9bea
--- /dev/null
+++ b/trace/event-internal.h
@@ -0,0 +1,33 @@
+/*
+ * Interface for configuring and controlling the state of tracing events.
+ *
+ * Copyright (C) 2012 Lluís Vilanova <vilanova@ac.upc.edu>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef TRACE__EVENT_INTERNAL_H
+#define TRACE__EVENT_INTERNAL_H
+
+#include "trace/generated-events.h"
+
+
+/**
+ * TraceEvent:
+ * @id: Unique event identifier.
+ * @name: Event name.
+ * @sstate: Static tracing state.
+ * @dstate: Dynamic tracing state.
+ *
+ * Opaque generic description of a tracing event.
+ */
+typedef struct TraceEvent {
+    TraceEventID id;
+    const char * name;
+    const bool sstate;
+    bool dstate;
+} TraceEvent;
+
+
+#endif  /* TRACE__EVENT_INTERNAL_H */
-- 
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