[Qemu-devel] [PATCH v3 07/18] trace: give each trace event a named TraceEvent struct

["Daniel P. Berrange" <berrange@redhat.com>]

Currently we only expose a TraceEvent array, which must
be indexed via the TraceEventID enum constants. This
changes the generator to expose a named TraceEvent
instance for each event, with an _EV suffix.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 scripts/tracetool/format/events_c.py | 20 ++++++++++++++------
 scripts/tracetool/format/events_h.py | 10 +++++++---
 trace/control-internal.h             |  2 +-
 trace/control.c                      |  2 +-
 4 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/scripts/tracetool/format/events_c.py b/scripts/tracetool/format/events_c.py
index ef873fa..5f67a7b 100644
--- a/scripts/tracetool/format/events_c.py
+++ b/scripts/tracetool/format/events_c.py
@@ -28,22 +28,30 @@ def generate(events, backend):
     for e in events:
         out('uint16_t %s;' % e.api(e.QEMU_DSTATE))
 
-    out('TraceEvent trace_events[TRACE_EVENT_COUNT] = {')
-
     for e in events:
         if "vcpu" in e.properties:
             vcpu_id = "TRACE_VCPU_" + e.name.upper()
         else:
             vcpu_id = "TRACE_VCPU_EVENT_COUNT"
-        out('    { .id = %(id)s, .vcpu_id = %(vcpu_id)s,'
-            ' .name = \"%(name)s\",'
-            ' .sstate = %(sstate)s,',
-            ' .dstate = &%(dstate)s, }, ',
+        out('TraceEvent %(event)s = {',
+            '  .id = %(id)s,',
+            '  .vcpu_id = %(vcpu_id)s,',
+            '  .name = \"%(name)s\",',
+            '  .sstate = %(sstate)s,',
+            '  .dstate = &%(dstate)s ',
+            '};',
+            event = "TRACE_" + e.name.upper() + "_EV",
             id = "TRACE_" + e.name.upper(),
             vcpu_id = vcpu_id,
             name = e.name,
             sstate = "TRACE_%s_ENABLED" % e.name.upper(),
             dstate = e.api(e.QEMU_DSTATE))
 
+    out('TraceEvent *trace_events[TRACE_EVENT_COUNT] = {')
+
+    for e in events:
+        out('&%(event)s,',
+            event = "TRACE_" + e.name.upper() + "_EV")
+
     out('};',
         '')
diff --git a/scripts/tracetool/format/events_h.py b/scripts/tracetool/format/events_h.py
index 03417de..1478e4c 100644
--- a/scripts/tracetool/format/events_h.py
+++ b/scripts/tracetool/format/events_h.py
@@ -21,7 +21,12 @@ def generate(events, backend):
         '',
         '#ifndef TRACE__GENERATED_EVENTS_H',
         '#define TRACE__GENERATED_EVENTS_H',
-        '')
+        '',
+        '#include "trace/event-internal.h"',
+        )
+
+    for e in events:
+        out('extern TraceEvent TRACE_%s_EV;' % e.name.upper())
 
     # event identifiers
     out('typedef enum {')
@@ -58,6 +63,5 @@ def generate(events, backend):
                 enabled=enabled)
         out('#define TRACE_%s_ENABLED %d' % (e.name.upper(), enabled))
 
-    out('#include "trace/event-internal.h"',
-        '',
+    out('',
         '#endif  /* TRACE__GENERATED_EVENTS_H */')
diff --git a/trace/control-internal.h b/trace/control-internal.h
index 828c1fc..52b6b72 100644
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -15,7 +15,7 @@
 #include "qom/cpu.h"
 
 
-extern TraceEvent trace_events[];
+extern TraceEvent *trace_events[];
 extern int trace_events_enabled_count;
 
 
diff --git a/trace/control.c b/trace/control.c
index c681fa0..71ad6ba 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -106,7 +106,7 @@ void trace_event_iter_init(TraceEventIter *iter, const char *pattern)
 TraceEvent *trace_event_iter_next(TraceEventIter *iter)
 {
     while (iter->event < TRACE_EVENT_COUNT) {
-        TraceEvent *ev = &(trace_events[iter->event]);
+        TraceEvent *ev = trace_events[iter->event];
         iter->event++;
         if (!iter->pattern ||
             pattern_glob(iter->pattern,
-- 
2.7.4