| # Copyright 2019 Google LLC |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # https://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| """Emboss C++ code generator. |
| |
| This is a driver program that reads IR, feeds it to header_generator, and prints |
| the result. |
| """ |
| |
| from __future__ import print_function |
| |
| import argparse |
| import os |
| import sys |
| |
| from compiler.back_end.cpp import header_generator |
| from compiler.util import error |
| from compiler.util import ir_data |
| |
| |
| def _parse_command_line(argv): |
| """Parses the given command-line arguments.""" |
| parser = argparse.ArgumentParser(description="Emboss compiler C++ back end.", |
| prog=argv[0]) |
| parser.add_argument("--input-file", |
| type=str, |
| help=".emb.ir file to compile.") |
| parser.add_argument("--output-file", |
| type=str, |
| help="Write header to file. If not specified, write " + |
| "header to stdout.") |
| parser.add_argument("--color-output", |
| default="if_tty", |
| choices=["always", "never", "if_tty", "auto"], |
| help="Print error messages using color. 'auto' is a " |
| "synonym for 'if_tty'.") |
| parser.add_argument("--cc-enum-traits", |
| action=argparse.BooleanOptionalAction, |
| default=True, |
| help="""Controls generation of EnumTraits by the C++ |
| backend""") |
| return parser.parse_args(argv[1:]) |
| |
| |
| def _show_errors(errors, ir, color_output): |
| """Prints errors with source code snippets.""" |
| source_codes = {} |
| for module in ir.module: |
| source_codes[module.source_file_name] = module.source_text |
| use_color = (color_output == "always" or |
| (color_output in ("auto", "if_tty") and |
| os.isatty(sys.stderr.fileno()))) |
| print(error.format_errors(errors, source_codes, use_color), file=sys.stderr) |
| |
| def generate_headers_and_log_errors(ir, color_output, config: header_generator.Config): |
| """Generates a C++ header and logs any errors. |
| |
| Arguments: |
| ir: EmbossIr of the module. |
| color_output: "always", "never", "if_tty", "auto" |
| config: Header generation configuration. |
| |
| Returns: |
| A tuple of (header, errors) |
| """ |
| header, errors = header_generator.generate_header(ir, config) |
| if errors: |
| _show_errors(errors, ir, color_output) |
| return (header, errors) |
| |
| def main(flags): |
| if flags.input_file: |
| with open(flags.input_file) as f: |
| ir = ir_data.EmbossIr.from_json(f.read()) |
| else: |
| ir = ir_data.EmbossIr.from_json(sys.stdin.read()) |
| config = header_generator.Config(include_enum_traits=flags.cc_enum_traits) |
| header, errors = generate_headers_and_log_errors(ir, flags.color_output, config) |
| if errors: |
| return 1 |
| if flags.output_file: |
| with open(flags.output_file, "w") as f: |
| f.write(header) |
| else: |
| print(header) |
| return 0 |
| |
| |
| if __name__ == '__main__': |
| sys.exit(main(_parse_command_line(sys.argv))) |