trace: remove the TraceEventID and TraceEventVCPUID enums

The TraceEventID and TraceEventVCPUID enums constants are
no longer actually used for anything critical.

The TRACE_EVENT_COUNT limit is used to determine the size
of the TraceEvents array, and can be removed if we just
NULL terminate the array instead.

The TRACE_VCPU_EVENT_COUNT limit is used as a magic value
for marking non-vCPU events, and also for declaring the
size of the trace dstate mask in the CPUState struct.
The former usage can be replaced by a dedicated constant
TRACE_EVENT_VCPU_NONE, defined as (uint32_t)-1. For the
latter usage, we can simply define a constant for the
number of VCPUs, avoiding the need for the full enum.

The only other usages of the enum values can be replaced
by accesing the id/vcpu_id fields via the named TraceEvent
structs.

Reviewed-by: Lluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1475588159-30598-11-git-send-email-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 2 insertions, 17 deletions

diff --git a/scripts/tracetool/format/events_h.py b/scripts/tracetool/format/events_h.py
index 80a66c57d5..ca6d730519 100644
--- a/scripts/tracetool/format/events_h.py
+++ b/scripts/tracetool/format/events_h.py
@@ -29,27 +29,12 @@ def generate(events, backend):
         out('extern TraceEvent %(event)s;',
             event = e.api(e.QEMU_EVENT))
 
-    # event identifiers
-    out('typedef enum {')
-
-    for e in events:
-        out('    TRACE_%s,' % e.name.upper())
-
-    out('    TRACE_EVENT_COUNT',
-        '} TraceEventID;')
-
     for e in events:
         out('extern uint16_t %s;' % e.api(e.QEMU_DSTATE))
 
-    # per-vCPU event identifiers
-    out('typedef enum {')
-
-    for e in events:
-        if "vcpu" in e.properties:
-            out('    TRACE_VCPU_%s,' % e.name.upper())
+    numvcpu = len([e for e in events if "vcpu" in e.properties])
 
-    out('    TRACE_VCPU_EVENT_COUNT',
-        '} TraceEventVCPUID;')
+    out("#define TRACE_VCPU_EVENT_COUNT %d" % numvcpu)
 
     # static state
     for e in events: