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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
# - HistogramFirstUseCounter
# - HistogramLastUseCounter
# - HistogramUseCounterCount
#
# The histograms are defined in files provided as command-line arguments.
from __future__ import print_function
import histogram_tools
import itertools
import sys
banner = """/* This file is auto-generated, see gen-histogram-enum.py. */
"""
header = """
#ifndef mozilla_TelemetryHistogramEnums_h
#define mozilla_TelemetryHistogramEnums_h
#include "mozilla/TemplateLib.h"
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.
all_histograms = list(histogram_tools.from_files(filenames))
groups = itertools.groupby(all_histograms,
lambda h: h.name().startswith("USE_COUNTER2_"))
# Print the histogram enums.
# Note that histogram_tools.py guarantees that all of the USE_COUNTER2_*
# histograms are defined in a contiguous block. We therefore assume
# that there's at most one group for which use_counter_group is true.
print("enum ID : uint32_t {", file=output)
seen_use_counters = False
for (use_counter_group, histograms) in groups:
if use_counter_group:
seen_use_counters = True
# The HistogramDUMMY* enum variables are used to make the computation
# of Histogram{First,Last}UseCounter easier. Otherwise, we'd have to
# special case the first and last histogram in the group.
if use_counter_group:
print(" HistogramFirstUseCounter,", file=output)
print(" HistogramDUMMY1 = HistogramFirstUseCounter - 1,", file=output)
for histogram in histograms:
cpp_guard = histogram.cpp_guard()
if cpp_guard:
print("#if defined(%s)" % cpp_guard, file=output)
print(" %s," % histogram.name(), file=output)
if cpp_guard:
print("#endif", file=output)
if use_counter_group:
print(" HistogramDUMMY2,", file=output)
print(" HistogramLastUseCounter = HistogramDUMMY2 - 1,", file=output)
print(" HistogramCount,", file=output)
if seen_use_counters:
print(" HistogramUseCounterCount = HistogramLastUseCounter - HistogramFirstUseCounter + 1", file=output)
else:
print(" HistogramFirstUseCounter = 0,", file=output)
print(" HistogramLastUseCounter = 0,", file=output)
print(" HistogramUseCounterCount = 0", file=output)
print("};", file=output)
# Write categorical label enums.
categorical = filter(lambda h: h.kind() == "categorical", all_histograms)
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 : FalseType {};", file=output)
for name,_,_ in enums:
print("template<> struct IsCategoricalLabelEnum<%s> : TrueType {};" % name, file=output)
print("\ntemplate<class T> struct CategoricalLabelId {};", file=output)
for name,_,id in enums:
print("template<> struct CategoricalLabelId<%s> : IntegralConstant<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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