xref: /openbmc/qemu/scripts/qapi/main.py (revision 6016b7b4) 
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"""
5QAPI Generator
6
7This is the main entry point for generating C code from the QAPI schema.
8"""
9
10import argparse
11import sys
12from typing import Optional
13
14from .commands import gen_commands
15from .common import must_match
16from .error import QAPIError
17from .events import gen_events
18from .introspect import gen_introspect
19from .schema import QAPISchema
20from .types import gen_types
21from .visit import gen_visit
22
23
24def 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
31def 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
57def 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
96