scripts/qapi/main.py

   1 # This work is licensed under the terms of the GNU GPL, version 2 or later.
   2 # See the COPYING file in the top-level directory.
   3
   4 """
   5 QAPI Generator
   6
   7 This is the main entry point for generating C code from the QAPI schema.
   8 """
   9
  10 import argparse
  11 import sys
  12 from typing import Optional
  13
  14 from .commands import gen_commands
  15 from .common import must_match
  16 from .error import QAPIError
  17 from .events import gen_events
  18 from .introspect import gen_introspect
  19 from .schema import QAPISchema
  20 from .types import gen_types
  21 from .visit import gen_visit
  22
  23
  24 def invalid_prefix_char(prefix: str) -> Optional[str]:
  25     match = must_match(r'([A-Za-z_.-][A-Za-z0-9_.-]*)?', prefix)
  26     if match.end() != len(prefix):
  27         return prefix[match.end()]
  28     return None
  29
  30
  31 def generate(schema_file: str,
  32              output_dir: str,
  33              prefix: str,
  34              unmask: bool = False,
  35              builtins: bool = False) -> None:
  36     """
  37     Generate C code for the given schema into the target directory.
  38
  39     :param schema_file: The primary QAPI schema file.
  40     :param output_dir: The output directory to store generated code.
  41     :param prefix: Optional C-code prefix for symbol names.
  42     :param unmask: Expose non-ABI names through introspection?
  43     :param builtins: Generate code for built-in types?
  44
  45     :raise QAPIError: On failures.
  46     """
  47     assert invalid_prefix_char(prefix) is None
  48
  49     schema = QAPISchema(schema_file)
  50     gen_types(schema, output_dir, prefix, builtins)
  51     gen_visit(schema, output_dir, prefix, builtins)
  52     gen_commands(schema, output_dir, prefix)
  53     gen_events(schema, output_dir, prefix)
  54     gen_introspect(schema, output_dir, prefix, unmask)
  55
  56
  57 def main() -> int:
  58     """
  59     gapi-gen executable entry point.
  60     Expects arguments via sys.argv, see --help for details.
  61
  62     :return: int, 0 on success, 1 on failure.
  63     """
  64     parser = argparse.ArgumentParser(
  65         description='Generate code from a QAPI schema')
  66     parser.add_argument('-b', '--builtins', action='store_true',
  67                         help="generate code for built-in types")
  68     parser.add_argument('-o', '--output-dir', action='store',
  69                         default='',
  70                         help="write output to directory OUTPUT_DIR")
  71     parser.add_argument('-p', '--prefix', action='store',
  72                         default='',
  73                         help="prefix for symbols")
  74     parser.add_argument('-u', '--unmask-non-abi-names', action='store_true',
  75                         dest='unmask',
  76                         help="expose non-ABI names in introspection")
  77     parser.add_argument('schema', action='store')
  78     args = parser.parse_args()
  79
  80     funny_char = invalid_prefix_char(args.prefix)
  81     if funny_char:
  82         msg = f"funny character '{funny_char}' in argument of --prefix"
  83         print(f"{sys.argv[0]}: {msg}", file=sys.stderr)
  84         return 1
  85
  86     try:
  87         generate(args.schema,
  88                  output_dir=args.output_dir,
  89                  prefix=args.prefix,
  90                  unmask=args.unmask,
  91                  builtins=args.builtins)
  92     except QAPIError as err:
  93         print(f"{sys.argv[0]}: {str(err)}", file=sys.stderr)
  94         return 1
  95     return 0