perf scripts python: Add classes and conversion functions

This commit introduces new classes and conversion functions to
facilitate the representation of Gecko profile information. The new
classes Frame, Stack, Sample, and Thread are added to handle specific
components of the profile data, also link to the origin docs has been
commented out.

Additionally, Inside the Thread class _to_json_dict() method has been
created that converts the current thread data into the corresponding
format expected by the GeckoThread JSON schema, as per the Gecko
profile format specification.
Signed-off-by: Anup Sharma <anupnewsmail@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/ab7b40bd32df7101a6f8b4a3aa41570b63b831ac.1689961706.git.anupnewsmail@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/scripts/python/gecko.py

@@ -11,7 +11,8 @@
 
 import os
 import sys
-from typing import Dict
+from dataclasses import dataclass, field
+from typing import List, Dict, Optional, NamedTuple, Set, Tuple, Any
 
 # Add the Perf-Trace-Util library to the Python path
 sys.path.append(os.environ['PERF_EXEC_PATH'] + \
@@ -20,9 +21,139 @@ sys.path.append(os.environ['PERF_EXEC_PATH'] + \
 from perf_trace_context import *
 from Core import *
 
+StringID = int
+StackID = int
+FrameID = int
+CategoryID = int
+Milliseconds = float
+
 # start_time is intialiazed only once for the all event traces.
 start_time = None
 
+# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L156
+class Frame(NamedTuple):
+	string_id: StringID
+	relevantForJS: bool
+	innerWindowID: int
+	implementation: None
+	optimizations: None
+	line: None
+	column: None
+	category: CategoryID
+	subcategory: int
+
+# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L216
+class Stack(NamedTuple):
+	prefix_id: Optional[StackID]
+	frame_id: FrameID
+
+# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L90
+class Sample(NamedTuple):
+	stack_id: Optional[StackID]
+	time_ms: Milliseconds
+	responsiveness: int
+
+@dataclass
+class Thread:
+	"""A builder for a profile of the thread.
+
+	Attributes:
+		comm: Thread command-line (name).
+		pid: process ID of containing process.
+		tid: thread ID.
+		samples: Timeline of profile samples.
+		frameTable: interned stack frame ID -> stack frame.
+		stringTable: interned string ID -> string.
+		stringMap: interned string -> string ID.
+		stackTable: interned stack ID -> stack.
+		stackMap: (stack prefix ID, leaf stack frame ID) -> interned Stack ID.
+		frameMap: Stack Frame string -> interned Frame ID.
+		comm: str
+		pid: int
+		tid: int
+		samples: List[Sample] = field(default_factory=list)
+		frameTable: List[Frame] = field(default_factory=list)
+		stringTable: List[str] = field(default_factory=list)
+		stringMap: Dict[str, int] = field(default_factory=dict)
+		stackTable: List[Stack] = field(default_factory=list)
+		stackMap: Dict[Tuple[Optional[int], int], int] = field(default_factory=dict)
+		frameMap: Dict[str, int] = field(default_factory=dict)
+	"""
+	comm: str
+	pid: int
+	tid: int
+	samples: List[Sample] = field(default_factory=list)
+	frameTable: List[Frame] = field(default_factory=list)
+	stringTable: List[str] = field(default_factory=list)
+	stringMap: Dict[str, int] = field(default_factory=dict)
+	stackTable: List[Stack] = field(default_factory=list)
+	stackMap: Dict[Tuple[Optional[int], int], int] = field(default_factory=dict)
+	frameMap: Dict[str, int] = field(default_factory=dict)
+
+	def _to_json_dict(self) -> Dict:
+		"""Converts current Thread to GeckoThread JSON format."""
+		# Gecko profile format is row-oriented data as List[List],
+		# And a schema for interpreting each index.
+		# Schema:
+		# https://github.com/firefox-devtools/profiler/blob/main/docs-developer/gecko-profile-format.md
+		# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L230
+		return {
+			"tid": self.tid,
+			"pid": self.pid,
+			"name": self.comm,
+			# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L51
+			"markers": {
+				"schema": {
+					"name": 0,
+					"startTime": 1,
+					"endTime": 2,
+					"phase": 3,
+					"category": 4,
+					"data": 5,
+				},
+				"data": [],
+			},
+
+			# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L90
+			"samples": {
+				"schema": {
+					"stack": 0,
+					"time": 1,
+					"responsiveness": 2,
+				},
+				"data": self.samples
+			},
+
+			# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L156
+			"frameTable": {
+				"schema": {
+					"location": 0,
+					"relevantForJS": 1,
+					"innerWindowID": 2,
+					"implementation": 3,
+					"optimizations": 4,
+					"line": 5,
+					"column": 6,
+					"category": 7,
+					"subcategory": 8,
+				},
+				"data": self.frameTable,
+			},
+
+			# https://github.com/firefox-devtools/profiler/blob/53970305b51b9b472e26d7457fee1d66cd4e2737/src/types/gecko-profile.js#L216
+			"stackTable": {
+				"schema": {
+					"prefix": 0,
+					"frame": 1,
+				},
+				"data": self.stackTable,
+			},
+			"stringTable": self.stringTable,
+			"registerTime": 0,
+			"unregisterTime": None,
+			"processType": "default",
+		}
+
 # Uses perf script python interface to parse each
 # event and store the data in the thread builder.
 def process_event(param_dict: Dict) -> None: