xref: /llvm-project/libcxx/utils/generate_libcxx_cppm_in.py (revision 600462a2db7c044896122acfb347ce2d4d88271f) 
1# ===----------------------------------------------------------------------===##
2#
3# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4# See https://llvm.org/LICENSE.txt for license information.
5# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6#
7# ===----------------------------------------------------------------------===##
8
9import os.path
10import sys
11
12from libcxx.header_information import module_headers
13from libcxx.header_information import header_restrictions
14from libcxx.header_information import headers_not_available
15
16
17def write_file(module):
18    libcxx_module_directory = os.path.join(
19        os.path.dirname(os.path.dirname(os.path.realpath(__file__))), "modules"
20    )
21    with open(
22        os.path.join(libcxx_module_directory, f"{module}.cppm.in"), "w"
23    ) as module_cpp_in:
24        module_cpp_in.write(
25            """\
26// -*- C++ -*-
27//===----------------------------------------------------------------------===//
28//
29// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
30// See https://llvm.org/LICENSE.txt for license information.
31// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
32//
33//===----------------------------------------------------------------------===//
34
35// WARNING, this entire header is generated by
36// utils/generate_libcxx_cppm_in.py
37// DO NOT MODIFY!
38
39module;
40
41#include <__config>
42
43// The headers of Table 24: C++ library headers [tab:headers.cpp]
44// and the headers of Table 25: C++ headers for C library facilities [tab:headers.cpp.c]
45"""
46        )
47        for header in module_headers:
48            if header in header_restrictions:
49                module_cpp_in.write(
50                    f"""\
51#if {header_restrictions[header]}
52#  include <{header}>
53#endif
54"""
55                )
56            else:
57                module_cpp_in.write(f"#include <{header}>\n")
58
59        module_cpp_in.write("\n// *** Headers not yet available ***\n")
60        for header in sorted(headers_not_available):
61            module_cpp_in.write(
62                f"""\
63#if __has_include(<{header}>)
64#  error "please update the header information for <{header}> in headers_not_available in utils/libcxx/header_information.py"
65#endif // __has_include(<{header}>)
66"""
67            )
68
69        module_cpp_in.write(
70            f"""
71export module {module};
72
73@LIBCXX_MODULE_STD_INCLUDE_SOURCES@
74{'@LIBCXX_MODULE_STD_COMPAT_INCLUDE_SOURCES@' if module == 'std.compat' else ''}"""
75        )
76
77
78if __name__ == "__main__":
79    if len(sys.argv) != 2 or (sys.argv[1] != "std" and sys.argv[1] != "std.compat"):
80        sys.stderr.write(
81            f"""\
82Usage:
83{os.path.basename(__file__)} (std|std.compat)
84"""
85        )
86        sys.exit(1)
87
88    write_file(sys.argv[1])
89