| #!/usr/bin/env python3 |
| # |
| # ===- Generate headers for libc functions ------------------*- python -*--==# |
| # |
| # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| # See https://llvm.org/LICENSE.txt for license information. |
| # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| # |
| # ==------------------------------------------------------------------------==# |
| |
| import argparse |
| import json |
| import sys |
| from pathlib import Path |
| |
| from header import HeaderFile |
| from yaml_to_classes import load_yaml_file, fill_public_api |
| |
| |
| def main(): |
| parser = argparse.ArgumentParser(description="Generate header files from YAML") |
| parser.add_argument( |
| "yaml_file", |
| help="Path to the YAML file containing header specification", |
| metavar="FILE", |
| type=Path, |
| nargs="+", |
| ) |
| parser.add_argument( |
| "-o", |
| "--output", |
| help="Path to write generated header file", |
| type=Path, |
| required=True, |
| ) |
| parser.add_argument( |
| "--json", |
| help="Write JSON instead of a header, can use multiple YAML files", |
| action="store_true", |
| ) |
| parser.add_argument( |
| "--depfile", |
| help="Path to write a depfile", |
| type=Path, |
| ) |
| parser.add_argument( |
| "--write-if-changed", |
| help="Write the output file only if its contents have changed", |
| action="store_true", |
| default=False, |
| ) |
| parser.add_argument( |
| "-e", |
| "--entry-point", |
| help="Entry point to include; may be given many times", |
| metavar="SYMBOL", |
| action="append", |
| ) |
| args = parser.parse_args() |
| |
| if not args.json and len(args.yaml_file) != 1: |
| print("Only one YAML file at a time without --json", file=sys.stderr) |
| parser.print_usage(sys.stderr) |
| return 2 |
| |
| files_read = set() |
| |
| def write_depfile(): |
| if not args.depfile: |
| return |
| deps = " ".join(str(f) for f in sorted(files_read)) |
| args.depfile.parent.mkdir(parents=True, exist_ok=True) |
| with open(args.depfile, "w") as depfile: |
| depfile.write(f"{args.output}: {deps}\n") |
| |
| def load_yaml(path): |
| files_read.add(path) |
| return load_yaml_file(path, HeaderFile, args.entry_point) |
| |
| def load_header(yaml_file): |
| merge_from_files = dict() |
| |
| def merge_from(paths): |
| for path in paths: |
| # Load each file exactly once, in case of redundant merges. |
| if path in merge_from_files: |
| continue |
| header = load_yaml(path) |
| merge_from_files[path] = header |
| merge_from(path.parent / f for f in header.merge_yaml_files) |
| |
| # Load the main file first. |
| header = load_yaml(yaml_file) |
| |
| # Now load all the merge_yaml_files, and transitive merge_yaml_files. |
| merge_from(yaml_file.parent / f for f in header.merge_yaml_files) |
| |
| # Merge in all those files' contents. |
| for merge_from_path, merge_from_header in merge_from_files.items(): |
| if merge_from_header.name is not None: |
| print( |
| f"{merge_from_path!s}: Merge file cannot have header field", |
| file=sys.stderr, |
| ) |
| return 2 |
| header.merge(merge_from_header) |
| |
| return header |
| |
| if args.json: |
| contents = json.dumps( |
| [load_header(file).json_data() for file in args.yaml_file], |
| indent=2, |
| ) |
| else: |
| [yaml_file] = args.yaml_file |
| header = load_header(yaml_file) |
| # The header_template path is relative to the containing YAML file. |
| template = header.template(yaml_file.parent, files_read) |
| contents = fill_public_api(header.public_api(), template) |
| |
| write_depfile() |
| |
| if ( |
| not args.write_if_changed |
| or not args.output.exists() |
| or args.output.read_text() != contents |
| ): |
| args.output.parent.mkdir(parents=True, exist_ok=True) |
| args.output.write_text(contents) |
| |
| |
| if __name__ == "__main__": |
| sys.exit(main()) |