perf jevents: Combine table prefix and suffix writing

Combine into a single function to simplify, in a later change, writing
metrics separately.
Reviewed-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kang Minchul <tegongkang@gmail.com>
Cc: Kim Phillips <kim.phillips@amd.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20230126233645.200509-9-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/pmu-events/jevents.py

@@ -19,10 +19,10 @@ _sys_event_tables = []
 # JsonEvent. Architecture standard events are in json files in the top
 # f'{_args.starting_dir}/{_args.arch}' directory.
 _arch_std_events = {}
-# Track whether an events table is currently being defined and needs closing.
-_close_table = False
 # Events to write out when the table is closed
 _pending_events = []
+# Name of table to be written out
+_pending_events_tblname = None
 # Global BigCString shared by all structures.
 _bcs = None
 # Order specific JsonEvent attributes will be visited.
@@ -378,24 +378,13 @@ def preprocess_arch_std_files(archpath: str) -> None:
           _arch_std_events[event.metric_name.lower()] = event
 
 
-def print_events_table_prefix(tblname: str) -> None:
-  """Called when a new events table is started."""
-  global _close_table
-  if _close_table:
-    raise IOError('Printing table prefix but last table has no suffix')
-  _args.output_file.write(f'static const struct compact_pmu_event {tblname}[] = {{\n')
-  _close_table = True
-
-
 def add_events_table_entries(item: os.DirEntry, topic: str) -> None:
   """Add contents of file to _pending_events table."""
-  if not _close_table:
-    raise IOError('Table entries missing prefix')
   for e in read_json_events(item.path, topic):
     _pending_events.append(e)
 
 
-def print_events_table_suffix() -> None:
+def print_pending_events() -> None:
   """Optionally close events table."""
 
   def event_cmp_key(j: JsonEvent) -> Tuple[bool, str, str, str, str]:
@@ -407,17 +396,19 @@ def print_events_table_suffix() -> None:
     return (j.desc is not None, fix_none(j.topic), fix_none(j.name), fix_none(j.pmu),
             fix_none(j.metric_name))
 
-  global _close_table
-  if not _close_table:
+  global _pending_events
+  if not _pending_events:
     return
 
-  global _pending_events
+  global _pending_events_tblname
+  _args.output_file.write(
+      f'static const struct compact_pmu_event {_pending_events_tblname}[] = {{\n')
+
   for event in sorted(_pending_events, key=event_cmp_key):
     _args.output_file.write(event.to_c_string())
-    _pending_events = []
+  _pending_events = []
 
   _args.output_file.write('};\n\n')
-  _close_table = False
 
 def get_topic(topic: str) -> str:
   if topic.endswith('metrics.json'):
@@ -455,12 +446,13 @@ def process_one_file(parents: Sequence[str], item: os.DirEntry) -> None:
 
   # model directory, reset topic
   if item.is_dir() and is_leaf_dir(item.path):
-    print_events_table_suffix()
+    print_pending_events()
 
     tblname = file_name_to_table_name(parents, item.name)
     if item.name == 'sys':
       _sys_event_tables.append(tblname)
-    print_events_table_prefix(tblname)
+    global _pending_events_tblname
+    _pending_events_tblname = tblname
     return
 
   # base dir or too deep
@@ -809,7 +801,7 @@ struct compact_pmu_event {
   for arch in archs:
     arch_path = f'{_args.starting_dir}/{arch}'
     ftw(arch_path, [], process_one_file)
-    print_events_table_suffix()
+    print_pending_events()
 
   print_mapping_table(archs)
   print_system_mapping_table()