[PULL 07/16] tracetool/backend: remove redundant trace event checks

[Stefan Hajnoczi <stefanha@redhat.com>]

From: Tanish Desai <tanishdesai37@gmail.com>

Use CHECK_TRACE_EVENT_GET_STATE in log, syslog, dtrace and simple
backend, so that the "if (trace_event_get_state)" is created from common
code and unified when multiple backends are active.

When a single backend is active there is no code change (except
for the log backend, as shown in tests/tracetool/log.h), but the
code in the backends is simpler.

Signed-off-by: Tanish Desai <tanishdesai37@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20250929154938.594389-8-pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 tests/tracetool/log.h               | 16 ++++++++++------
 scripts/tracetool/backend/ftrace.py |  6 ++----
 scripts/tracetool/backend/log.py    | 10 ++++------
 scripts/tracetool/backend/simple.py |  8 ++------
 scripts/tracetool/backend/syslog.py |  8 ++------
 5 files changed, 20 insertions(+), 28 deletions(-)

diff --git a/tests/tracetool/log.h b/tests/tracetool/log.h
index edcc7f9d47..c7795871f8 100644
--- a/tests/tracetool/log.h
+++ b/tests/tracetool/log.h
@@ -21,10 +21,12 @@ extern uint16_t _TRACE_TEST_WIBBLE_DSTATE;
 
 static inline void trace_test_blah(void *context, const char *filename)
 {
-    if (trace_event_get_state(TRACE_TEST_BLAH) && qemu_loglevel_mask(LOG_TRACE)) {
+    if (trace_event_get_state(TRACE_TEST_BLAH)) {
+        if (qemu_loglevel_mask(LOG_TRACE)) {
 #line 4 "trace-events"
-        qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
-#line 28 "log.h"
+            qemu_log("test_blah " "Blah context=%p filename=%s" "\n", context, filename);
+#line 29 "log.h"
+        }
     }
 }
 
@@ -34,10 +36,12 @@ static inline void trace_test_blah(void *context, const char *filename)
 
 static inline void trace_test_wibble(void *context, int value)
 {
-    if (trace_event_get_state(TRACE_TEST_WIBBLE) && qemu_loglevel_mask(LOG_TRACE)) {
+    if (trace_event_get_state(TRACE_TEST_WIBBLE)) {
+        if (qemu_loglevel_mask(LOG_TRACE)) {
 #line 5 "trace-events"
-        qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
-#line 41 "log.h"
+            qemu_log("test_wibble " "Wibble context=%p value=%d" "\n", context, value);
+#line 44 "log.h"
+        }
     }
 }
 #endif /* TRACE_TESTSUITE_GENERATED_TRACERS_H */
diff --git a/scripts/tracetool/backend/ftrace.py b/scripts/tracetool/backend/ftrace.py
index 8c0ce3f23a..7ddd5d11a6 100644
--- a/scripts/tracetool/backend/ftrace.py
+++ b/scripts/tracetool/backend/ftrace.py
@@ -16,6 +16,7 @@
 
 
 PUBLIC = True
+CHECK_TRACE_EVENT_GET_STATE = True
 
 
 def generate_h_begin(events, group):
@@ -28,14 +29,11 @@ def generate_h(event, group):
     if len(event.args) > 0:
         argnames = ", " + argnames
 
-    out('    if (trace_event_get_state(%(event_id)s)) {',
-        '#line %(event_lineno)d "%(event_filename)s"',
+    out('#line %(event_lineno)d "%(event_filename)s"',
         '        ftrace_write("%(name)s " %(fmt)s "\\n" %(argnames)s);',
         '#line %(out_next_lineno)d "%(out_filename)s"',
-        '    }',
         name=event.name,
         args=event.args,
-        event_id="TRACE_" + event.name.upper(),
         event_lineno=event.lineno,
         event_filename=event.filename,
         fmt=event.fmt.rstrip("\n"),
diff --git a/scripts/tracetool/backend/log.py b/scripts/tracetool/backend/log.py
index faacec4610..d01d234289 100644
--- a/scripts/tracetool/backend/log.py
+++ b/scripts/tracetool/backend/log.py
@@ -16,6 +16,7 @@
 
 
 PUBLIC = True
+CHECK_TRACE_EVENT_GET_STATE = True
 
 
 def generate_h_begin(events, group):
@@ -28,14 +29,11 @@ def generate_h(event, group):
     if len(event.args) > 0:
         argnames = ", " + argnames
 
-    cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper())
-
-    out('    if (%(cond)s && qemu_loglevel_mask(LOG_TRACE)) {',
+    out('        if (qemu_loglevel_mask(LOG_TRACE)) {',
         '#line %(event_lineno)d "%(event_filename)s"',
-        '        qemu_log("%(name)s " %(fmt)s "\\n"%(argnames)s);',
+        '            qemu_log("%(name)s " %(fmt)s "\\n"%(argnames)s);',
         '#line %(out_next_lineno)d "%(out_filename)s"',
-        '    }',
-        cond=cond,
+        '        }',
         event_lineno=event.lineno,
         event_filename=event.filename,
         name=event.name,
diff --git a/scripts/tracetool/backend/simple.py b/scripts/tracetool/backend/simple.py
index 97e40495ee..b5a6b7205a 100644
--- a/scripts/tracetool/backend/simple.py
+++ b/scripts/tracetool/backend/simple.py
@@ -16,6 +16,7 @@
 
 
 PUBLIC = True
+CHECK_TRACE_EVENT_GET_STATE = True
 
 
 def is_string(arg):
@@ -36,13 +37,8 @@ def generate_h_begin(events, group):
 
 
 def generate_h(event, group):
-    event_id = 'TRACE_' + event.name.upper()
-    cond = "trace_event_get_state(%s)" % event_id
-    out('    if (%(cond)s) {',
-        '        _simple_%(api)s(%(args)s);',
-        '    }',
+    out('        _simple_%(api)s(%(args)s);',
         api=event.api(),
-        cond=cond,
         args=", ".join(event.args.names()))
 
 
diff --git a/scripts/tracetool/backend/syslog.py b/scripts/tracetool/backend/syslog.py
index 78ee67136b..177414d56a 100644
--- a/scripts/tracetool/backend/syslog.py
+++ b/scripts/tracetool/backend/syslog.py
@@ -16,6 +16,7 @@
 
 
 PUBLIC = True
+CHECK_TRACE_EVENT_GET_STATE = True
 
 
 def generate_h_begin(events, group):
@@ -28,14 +29,9 @@ def generate_h(event, group):
     if len(event.args) > 0:
         argnames = ", " + argnames
 
-    cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper())
-
-    out('    if (%(cond)s) {',
-        '#line %(event_lineno)d "%(event_filename)s"',
+    out('#line %(event_lineno)d "%(event_filename)s"',
         '        syslog(LOG_INFO, "%(name)s " %(fmt)s %(argnames)s);',
         '#line %(out_next_lineno)d "%(out_filename)s"',
-        '    }',
-        cond=cond,
         event_lineno=event.lineno,
         event_filename=event.filename,
         name=event.name,
-- 
2.51.0