91 lines
2.9 KiB
Python
91 lines
2.9 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 scalar information for C++. The scalars are defined
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# in a file provided as a command-line argument.
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from __future__ import print_function
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from shared_telemetry_utils import StringTable, static_assert
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import parse_scalars
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import sys
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# The banner/text at the top of the generated file.
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banner = """/* This file is auto-generated, only for internal use in TelemetryScalar.h,
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see gen-scalar-data.py. */
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"""
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file_header = """\
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#ifndef mozilla_TelemetryScalarData_h
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#define mozilla_TelemetryScalarData_h
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#include "ScalarInfo.h"
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namespace {
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"""
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file_footer = """\
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} // namespace
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#endif // mozilla_TelemetryScalarData_h
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"""
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def write_scalar_info(scalar, output, name_index, expiration_index):
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"""Writes a scalar entry to the output file.
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:param scalar: a ScalarType instance describing the scalar.
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:param output: the output stream.
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:param name_index: the index of the scalar name in the strings table.
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:param expiration_index: the index of the expiration version in the strings table.
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"""
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cpp_guard = scalar.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(" {{ {}, {}, {}, {}, {} }},"\
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.format(scalar.nsITelemetry_kind,
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name_index,
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expiration_index,
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scalar.dataset,
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"true" if scalar.keyed else "false"),
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file=output)
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if cpp_guard:
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print("#endif", file=output)
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def write_scalar_tables(scalars, output):
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"""Writes the scalar and strings tables to an header file.
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:param scalars: a list of ScalarType instances describing the scalars.
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:param output: the output stream.
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"""
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string_table = StringTable()
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print("const ScalarInfo gScalars[] = {", file=output)
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for s in scalars:
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# We add both the scalar label and the expiration string to the strings
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# table.
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name_index = string_table.stringIndex(s.label)
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exp_index = string_table.stringIndex(s.expires)
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# Write the scalar info entry.
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write_scalar_info(s, output, name_index, exp_index)
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print("};", file=output)
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string_table_name = "gScalarsStringTable"
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string_table.writeDefinition(output, string_table_name)
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static_assert(output, "sizeof(%s) <= UINT32_MAX" % string_table_name,
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"index overflow")
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def main(output, *filenames):
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# Load the scalars first.
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if len(filenames) > 1:
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raise Exception('We don\'t support loading from more than one file.')
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scalars = parse_scalars.load_scalars(filenames[0])
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# Write the scalar data file.
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print(banner, file=output)
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print(file_header, file=output)
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write_scalar_tables(scalars, output)
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print(file_footer, file=output)
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if __name__ == '__main__':
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main(sys.stdout, *sys.argv[1:])
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