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[linux.git] / scripts / generate_rust_analyzer.py
1 #!/usr/bin/env python3
2 # SPDX-License-Identifier: GPL-2.0
3 """generate_rust_analyzer - Generates the `rust-project.json` file for `rust-analyzer`.
4 """
5
6 import argparse
7 import json
8 import logging
9 import os
10 import pathlib
11 import subprocess
12 import sys
13
14 def args_crates_cfgs(cfgs):
15     crates_cfgs = {}
16     for cfg in cfgs:
17         crate, vals = cfg.split("=", 1)
18         crates_cfgs[crate] = vals.replace("--cfg", "").split()
19
20     return crates_cfgs
21
22 def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs):
23     # Generate the configuration list.
24     cfg = []
25     with open(objtree / "include" / "generated" / "rustc_cfg") as fd:
26         for line in fd:
27             line = line.replace("--cfg=", "")
28             line = line.replace("\n", "")
29             cfg.append(line)
30
31     # Now fill the crates list -- dependencies need to come first.
32     #
33     # Avoid O(n^2) iterations by keeping a map of indexes.
34     crates = []
35     crates_indexes = {}
36     crates_cfgs = args_crates_cfgs(cfgs)
37
38     def append_crate(display_name, root_module, deps, cfg=[], is_workspace_member=True, is_proc_macro=False):
39         crate = {
40             "display_name": display_name,
41             "root_module": str(root_module),
42             "is_workspace_member": is_workspace_member,
43             "is_proc_macro": is_proc_macro,
44             "deps": [{"crate": crates_indexes[dep], "name": dep} for dep in deps],
45             "cfg": cfg,
46             "edition": "2021",
47             "env": {
48                 "RUST_MODFILE": "This is only for rust-analyzer"
49             }
50         }
51         if is_proc_macro:
52             proc_macro_dylib_name = subprocess.check_output(
53                 [os.environ["RUSTC"], "--print", "file-names", "--crate-name", display_name, "--crate-type", "proc-macro", "-"],
54                 stdin=subprocess.DEVNULL,
55             ).decode('utf-8').strip()
56             crate["proc_macro_dylib_path"] = f"{objtree}/rust/{proc_macro_dylib_name}"
57         crates_indexes[display_name] = len(crates)
58         crates.append(crate)
59
60     # First, the ones in `rust/` since they are a bit special.
61     append_crate(
62         "core",
63         sysroot_src / "core" / "src" / "lib.rs",
64         [],
65         cfg=crates_cfgs.get("core", []),
66         is_workspace_member=False,
67     )
68
69     append_crate(
70         "compiler_builtins",
71         srctree / "rust" / "compiler_builtins.rs",
72         [],
73     )
74
75     append_crate(
76         "macros",
77         srctree / "rust" / "macros" / "lib.rs",
78         [],
79         is_proc_macro=True,
80     )
81
82     append_crate(
83         "build_error",
84         srctree / "rust" / "build_error.rs",
85         ["core", "compiler_builtins"],
86     )
87
88     append_crate(
89         "bindings",
90         srctree / "rust"/ "bindings" / "lib.rs",
91         ["core"],
92         cfg=cfg,
93     )
94     crates[-1]["env"]["OBJTREE"] = str(objtree.resolve(True))
95
96     append_crate(
97         "kernel",
98         srctree / "rust" / "kernel" / "lib.rs",
99         ["core", "macros", "build_error", "bindings"],
100         cfg=cfg,
101     )
102     crates[-1]["source"] = {
103         "include_dirs": [
104             str(srctree / "rust" / "kernel"),
105             str(objtree / "rust")
106         ],
107         "exclude_dirs": [],
108     }
109
110     def is_root_crate(build_file, target):
111         try:
112             return f"{target}.o" in open(build_file).read()
113         except FileNotFoundError:
114             return False
115
116     # Then, the rest outside of `rust/`.
117     #
118     # We explicitly mention the top-level folders we want to cover.
119     extra_dirs = map(lambda dir: srctree / dir, ("samples", "drivers"))
120     if external_src is not None:
121         extra_dirs = [external_src]
122     for folder in extra_dirs:
123         for path in folder.rglob("*.rs"):
124             logging.info("Checking %s", path)
125             name = path.name.replace(".rs", "")
126
127             # Skip those that are not crate roots.
128             if not is_root_crate(path.parent / "Makefile", name) and \
129                not is_root_crate(path.parent / "Kbuild", name):
130                 continue
131
132             logging.info("Adding %s", name)
133             append_crate(
134                 name,
135                 path,
136                 ["core", "kernel"],
137                 cfg=cfg,
138             )
139
140     return crates
141
142 def main():
143     parser = argparse.ArgumentParser()
144     parser.add_argument('--verbose', '-v', action='store_true')
145     parser.add_argument('--cfgs', action='append', default=[])
146     parser.add_argument("srctree", type=pathlib.Path)
147     parser.add_argument("objtree", type=pathlib.Path)
148     parser.add_argument("sysroot", type=pathlib.Path)
149     parser.add_argument("sysroot_src", type=pathlib.Path)
150     parser.add_argument("exttree", type=pathlib.Path, nargs="?")
151     args = parser.parse_args()
152
153     logging.basicConfig(
154         format="[%(asctime)s] [%(levelname)s] %(message)s",
155         level=logging.INFO if args.verbose else logging.WARNING
156     )
157
158     # Making sure that the `sysroot` and `sysroot_src` belong to the same toolchain.
159     assert args.sysroot in args.sysroot_src.parents
160
161     rust_project = {
162         "crates": generate_crates(args.srctree, args.objtree, args.sysroot_src, args.exttree, args.cfgs),
163         "sysroot": str(args.sysroot),
164     }
165
166     json.dump(rust_project, sys.stdout, sort_keys=True, indent=4)
167
168 if __name__ == "__main__":
169     main()
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