1 files changed, 69 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/build_scripts/gen_process_enum.py b/toolkit/components/telemetry/build_scripts/gen_process_enum.py
new file mode 100644
index 0000000000..bfe2d65e43
--- /dev/null
+++ b/toolkit/components/telemetry/build_scripts/gen_process_enum.py
@@ -0,0 +1,69 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Write out processes data for C++. The processes are defined
+# in a file provided as a command-line argument.
+
+import collections
+import sys
+
+from mozparsers.shared_telemetry_utils import ParserError, load_yaml_file
+
+# The banner/text at the top of the generated file.
+banner = """/* This file is auto-generated from Telemetry build scripts,
+   see gen_process_enum.py. */
+"""
+
+file_header = """\
+#ifndef mozilla_TelemetryProcessEnums_h
+#define mozilla_TelemetryProcessEnums_h
+
+#include <cstdint>
+
+namespace mozilla {
+namespace Telemetry {
+"""
+
+file_footer = """
+} // namespace Telemetry
+} // namespace mozilla
+#endif // mozilla_TelemetryProcessEnums_h"""
+
+
+def to_enum_label(name):
+    return name.title().replace("_", "")
+
+
+def write_processes_enum(processes, output):
+    def p(line):
+        print(line, file=output)
+
+    processes = collections.OrderedDict(processes)
+
+    p("enum class ProcessID : uint32_t {")
+    for i, (name, _) in enumerate(sorted(processes.items())):
+        p("  %s = %d," % (to_enum_label(name), i))
+    p("  Count = %d" % len(processes))
+    p("};")
+
+
+def main(output, *filenames):
+    if len(filenames) > 1:
+        raise Exception("We don't support loading from more than one file.")
+
+    try:
+        processes = load_yaml_file(filenames[0])
+
+        # Write the process data file.
+        print(banner, file=output)
+        print(file_header, file=output)
+        write_processes_enum(processes, output)
+        print(file_footer, file=output)
+    except ParserError as ex:
+        print("\nError generating processes enums:\n" + str(ex) + "\n")
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main(sys.stdout, *sys.argv[1:])