trace: [tracetool] Minimize the amount of per-backend code

Backends now only contain the essential backend-specific code, and most of the work is moved to frontend code.

Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 25 insertions, 31 deletions

diff --git a/scripts/tracetool/backend/ftrace.py b/scripts/tracetool/backend/ftrace.py
index 888c361aec..d798c71347 100644
--- a/scripts/tracetool/backend/ftrace.py
+++ b/scripts/tracetool/backend/ftrace.py
@@ -19,36 +19,30 @@ from tracetool import out
 PUBLIC = True
 
 
-def c(events):
-    pass
-
-def h(events):
+def generate_h_begin(events):
     out('#include "trace/ftrace.h"',
         '#include "trace/control.h"',
-        '',
-        )
-
-    for e in events:
-        argnames = ", ".join(e.args.names())
-        if len(e.args) > 0:
-            argnames = ", " + argnames
-
-        out('static inline void trace_%(name)s(%(args)s)',
-            '{',
-            '    char ftrace_buf[MAX_TRACE_STRLEN];',
-            '    int unused __attribute__ ((unused));',
-            '    int trlen;',
-            '    bool _state = trace_event_get_state(%(event_id)s);',
-            '    if (_state) {',
-            '        trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
-            '                         "%(name)s " %(fmt)s "\\n" %(argnames)s);',
-            '        trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
-            '        unused = write(trace_marker_fd, ftrace_buf, trlen);',
-            '    }',
-            '}',
-            name = e.name,
-            args = e.args,
-            event_id = "TRACE_" + e.name.upper(),
-            fmt = e.fmt.rstrip("\n"),
-            argnames = argnames,
-            )
+        '')
+
+
+def generate_h(event):
+    argnames = ", ".join(event.args.names())
+    if len(event.args) > 0:
+        argnames = ", " + argnames
+
+    out('    {',
+        '        char ftrace_buf[MAX_TRACE_STRLEN];',
+        '        int unused __attribute__ ((unused));',
+        '        int trlen;',
+        '        if (trace_event_get_state(%(event_id)s)) {',
+        '            trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
+        '                             "%(name)s " %(fmt)s "\\n" %(argnames)s);',
+        '            trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
+        '            unused = write(trace_marker_fd, ftrace_buf, trlen);',
+        '        }',
+        '    }',
+        name=event.name,
+        args=event.args,
+        event_id="TRACE_" + event.name.upper(),
+        fmt=event.fmt.rstrip("\n"),
+        argnames=argnames)