#!/usr/bin/env python3# SPDX-License-Identifier: GPL-2.0"""generate_rust_analyzer - Generates the `rust-project.json` file for `rust-analyzer`.""" import argparseimport jsonimport loggingimport osimport pathlibimport subprocessimport sys def args_crates_cfgs(cfgs):    crates_cfgs = {}    for cfg in cfgs:        crate, vals = cfg.split("=", 1)        crates_cfgs[crate] = vals.replace("--cfg", "").split()     return crates_cfgs def generate_crates(srctree, objtree, sysroot_src, external_src, cfgs, core_edition):    # Generate the configuration list.    cfg = []    with open(objtree / "include" / "generated" / "rustc_cfg") as fd:        for line in fd:            line = line.replace("--cfg=", "")            line = line.replace("\n", "")            cfg.append(line)     # Now fill the crates list -- dependencies need to come first.    #    # Avoid O(n^2) iterations by keeping a map of indexes.    crates = []    crates_indexes = {}    crates_cfgs = args_crates_cfgs(cfgs)     def append_crate(display_name, root_module, deps, cfg=[], is_workspace_member=True, is_proc_macro=False, edition="2021"):        crate = {            "display_name": display_name,            "root_module": str(root_module),            "is_workspace_member": is_workspace_member,            "is_proc_macro": is_proc_macro,            "deps": [{"crate": crates_indexes[dep], "name": dep} for dep in deps],            "cfg": cfg,            "edition": edition,            "env": {                "RUST_MODFILE": "This is only for rust-analyzer"            }        }        if is_proc_macro:            proc_macro_dylib_name = subprocess.check_output(                [os.environ["RUSTC"], "--print", "file-names", "--crate-name", display_name, "--crate-type", "proc-macro", "-"],                stdin=subprocess.DEVNULL,            ).decode('utf-8').strip()            crate["proc_macro_dylib_path"] = f"{objtree}/rust/{proc_macro_dylib_name}"        crates_indexes[display_name] = len(crates)        crates.append(crate)     def append_sysroot_crate(        display_name,        deps,        cfg=[],        edition="2021",    ):        append_crate(            display_name,            sysroot_src / display_name / "src" / "lib.rs",            deps,            cfg,            is_workspace_member=False,            edition=edition,        )     # NB: sysroot crates reexport items from one another so setting up our transitive dependencies    # here is important for ensuring that rust-analyzer can resolve symbols. The sources of truth    # for this dependency graph are `(sysroot_src / crate / "Cargo.toml" for crate in crates)`.    append_sysroot_crate("core", [], cfg=crates_cfgs.get("core", []), edition=core_edition)    append_sysroot_crate("alloc", ["core"])    append_sysroot_crate("std", ["alloc", "core"])    append_sysroot_crate("proc_macro", ["core", "std"])     append_crate(        "compiler_builtins",        srctree / "rust" / "compiler_builtins.rs",        [],    )     append_crate(        "macros",        srctree / "rust" / "macros" / "lib.rs",        ["std", "proc_macro"],        is_proc_macro=True,    )     append_crate(        "build_error",        srctree / "rust" / "build_error.rs",        ["core", "compiler_builtins"],    )     append_crate(        "pin_init_internal",        srctree / "rust" / "pin-init" / "internal" / "src" / "lib.rs",        [],        cfg=["kernel"],        is_proc_macro=True,    )     append_crate(        "pin_init",        srctree / "rust" / "pin-init" / "src" / "lib.rs",        ["core", "pin_init_internal", "macros"],        cfg=["kernel"],    )     append_crate(        "ffi",        srctree / "rust" / "ffi.rs",        ["core", "compiler_builtins"],    )     def append_crate_with_generated(        display_name,        deps,    ):        append_crate(            display_name,            srctree / "rust"/ display_name / "lib.rs",            deps,            cfg=cfg,        )        crates[-1]["env"]["OBJTREE"] = str(objtree.resolve(True))        crates[-1]["source"] = {            "include_dirs": [                str(srctree / "rust" / display_name),                str(objtree / "rust")            ],            "exclude_dirs": [],        }     append_crate_with_generated("bindings", ["core", "ffi"])    append_crate_with_generated("uapi", ["core", "ffi"])    append_crate_with_generated("kernel", ["core", "macros", "build_error", "pin_init", "ffi", "bindings", "uapi"])     def is_root_crate(build_file, target):        try:            return f"{target}.o" in open(build_file).read()        except FileNotFoundError:            return False     # Then, the rest outside of `rust/`.    #    # We explicitly mention the top-level folders we want to cover.    extra_dirs = map(lambda dir: srctree / dir, ("samples", "drivers"))    if external_src is not None:        extra_dirs = [external_src]    for folder in extra_dirs:        for path in folder.rglob("*.rs"):            logging.info("Checking %s", path)            name = path.name.replace(".rs", "")             # Skip those that are not crate roots.            if not is_root_crate(path.parent / "Makefile", name) and \               not is_root_crate(path.parent / "Kbuild", name):                continue             logging.info("Adding %s", name)            append_crate(                name,                path,                ["core", "kernel"],                cfg=cfg,            )     return crates def main():    parser = argparse.ArgumentParser()    parser.add_argument('--verbose', '-v', action='store_true')    parser.add_argument('--cfgs', action='append', default=[])    parser.add_argument("core_edition")    parser.add_argument("srctree", type=pathlib.Path)    parser.add_argument("objtree", type=pathlib.Path)    parser.add_argument("sysroot", type=pathlib.Path)    parser.add_argument("sysroot_src", type=pathlib.Path)    parser.add_argument("exttree", type=pathlib.Path, nargs="?")    args = parser.parse_args()     logging.basicConfig(        format="[%(asctime)s] [%(levelname)s] %(message)s",        level=logging.INFO if args.verbose else logging.WARNING    )     # Making sure that the `sysroot` and `sysroot_src` belong to the same toolchain.    assert args.sysroot in args.sysroot_src.parents     rust_project = {        "crates": generate_crates(args.srctree, args.objtree, args.sysroot_src, args.exttree, args.cfgs, args.core_edition),        "sysroot": str(args.sysroot),    }     json.dump(rust_project, sys.stdout, sort_keys=True, indent=4) if __name__ == "__main__":    main()