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# 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 a C++ enum definition whose members are the names of
# histograms as well as the following other members:
#
# - HistogramCount
#
# The histograms are defined in files provided as command-line arguments.
import sys
import buildconfig
from mozparsers import parse_histograms
from mozparsers.shared_telemetry_utils import ParserError
banner = """/* This file is auto-generated, see gen_histogram_enum.py. */
"""
header = """
#ifndef mozilla_TelemetryHistogramEnums_h
#define mozilla_TelemetryHistogramEnums_h
#include <cstdint>
#include <type_traits>
namespace mozilla {
namespace Telemetry {
"""
footer = """
} // namespace mozilla
} // namespace Telemetry
#endif // mozilla_TelemetryHistogramEnums_h"""
def main(output, *filenames):
# Print header.
print(banner, file=output)
print(header, file=output)
# Load the histograms.
try:
all_histograms = list(parse_histograms.from_files(filenames))
except ParserError as ex:
print("\nError processing histograms:\n" + str(ex) + "\n")
sys.exit(1)
# Print the histogram enums.
print("enum HistogramID : uint32_t {", file=output)
for histogram in all_histograms:
if histogram.record_on_os(buildconfig.substs["OS_TARGET"]):
print(" %s," % histogram.name(), file=output)
print(" HistogramCount,", file=output)
print("};", file=output)
# Write categorical label enums.
categorical = filter(lambda h: h.kind() == "categorical", all_histograms)
categorical = filter(
lambda h: h.record_on_os(buildconfig.substs["OS_TARGET"]), categorical
)
enums = [("LABELS_" + h.name(), h.labels(), h.name()) for h in categorical]
for name, labels, _ in enums:
print("\nenum class %s : uint32_t {" % name, file=output)
print(" %s" % ",\n ".join(labels), file=output)
print("};", file=output)
print(
"\ntemplate<class T> struct IsCategoricalLabelEnum : std::false_type {};",
file=output,
)
for name, _, _ in enums:
print(
"template<> struct IsCategoricalLabelEnum<%s> : std::true_type {};" % name,
file=output,
)
print("\ntemplate<class T> struct CategoricalLabelId {};", file=output)
for name, _, id in enums:
print(
"template<> struct CategoricalLabelId<%s> : "
"std::integral_constant<uint32_t, %s> {};" % (name, id),
file=output,
)
# Footer.
print(footer, file=output)
if __name__ == "__main__":
main(sys.stdout, *sys.argv[1:])
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