108 lines
3.9 KiB
Python
108 lines
3.9 KiB
Python
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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# Write out a C++ enum definition whose members are the names of
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# histograms as well as the following other members:
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#
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# - HistogramCount
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# - HistogramFirstUseCounter
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# - HistogramLastUseCounter
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# - HistogramUseCounterCount
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#
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# The histograms are defined in files provided as command-line arguments.
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from __future__ import print_function
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import histogram_tools
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import itertools
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import sys
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banner = """/* This file is auto-generated, see gen-histogram-enum.py. */
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"""
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header = """
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#ifndef mozilla_TelemetryHistogramEnums_h
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#define mozilla_TelemetryHistogramEnums_h
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#include "mozilla/TemplateLib.h"
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namespace mozilla {
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namespace Telemetry {
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"""
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footer = """
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} // namespace mozilla
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} // namespace Telemetry
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#endif // mozilla_TelemetryHistogramEnums_h"""
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def main(output, *filenames):
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# Print header.
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print(banner, file=output)
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print(header, file=output)
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# Load the histograms.
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all_histograms = list(histogram_tools.from_files(filenames))
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groups = itertools.groupby(all_histograms,
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lambda h: h.name().startswith("USE_COUNTER2_"))
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# Print the histogram enums.
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# Note that histogram_tools.py guarantees that all of the USE_COUNTER2_*
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# histograms are defined in a contiguous block. We therefore assume
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# that there's at most one group for which use_counter_group is true.
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print("enum ID : uint32_t {", file=output)
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seen_use_counters = False
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for (use_counter_group, histograms) in groups:
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if use_counter_group:
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seen_use_counters = True
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# The HistogramDUMMY* enum variables are used to make the computation
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# of Histogram{First,Last}UseCounter easier. Otherwise, we'd have to
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# special case the first and last histogram in the group.
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if use_counter_group:
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print(" HistogramFirstUseCounter,", file=output)
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print(" HistogramDUMMY1 = HistogramFirstUseCounter - 1,", file=output)
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for histogram in histograms:
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cpp_guard = histogram.cpp_guard()
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if cpp_guard:
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print("#if defined(%s)" % cpp_guard, file=output)
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print(" %s," % histogram.name(), file=output)
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if cpp_guard:
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print("#endif", file=output)
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if use_counter_group:
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print(" HistogramDUMMY2,", file=output)
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print(" HistogramLastUseCounter = HistogramDUMMY2 - 1,", file=output)
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print(" HistogramCount,", file=output)
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if seen_use_counters:
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print(" HistogramUseCounterCount = HistogramLastUseCounter - HistogramFirstUseCounter + 1", file=output)
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else:
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print(" HistogramFirstUseCounter = 0,", file=output)
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print(" HistogramLastUseCounter = 0,", file=output)
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print(" HistogramUseCounterCount = 0", file=output)
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print("};", file=output)
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# Write categorical label enums.
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categorical = filter(lambda h: h.kind() == "categorical", all_histograms)
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enums = [("LABELS_" + h.name(), h.labels(), h.name()) for h in categorical]
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for name,labels,_ in enums:
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print("\nenum class %s : uint32_t {" % name, file=output)
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print(" %s" % ",\n ".join(labels), file=output)
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print("};", file=output)
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print("\ntemplate<class T> struct IsCategoricalLabelEnum : FalseType {};", file=output)
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for name,_,_ in enums:
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print("template<> struct IsCategoricalLabelEnum<%s> : TrueType {};" % name, file=output)
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print("\ntemplate<class T> struct CategoricalLabelId {};", file=output)
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for name,_,id in enums:
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print("template<> struct CategoricalLabelId<%s> : IntegralConstant<uint32_t, %s> {};" % (name, id), file=output)
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# Footer.
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print(footer, file=output)
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if __name__ == '__main__':
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main(sys.stdout, *sys.argv[1:])
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