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Rename

#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
"""generate_rust_analyzer - Generates the `rust-project.json` file for `rust-analyzer`.
"""

import argparse
import json
import logging
import os
import pathlib
import 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):
    # 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):
        crates_indexes[display_name] = len(crates)
        crates.append({
            "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": "2021",
            "env": {
                "RUST_MODFILE": "This is only for rust-analyzer"
            }
        })

def append_sysroot_crate(
        display_name,
        deps,
        cfg=[],
    ):
        append_crate(
            display_name,
            sysroot_src / display_name / "src" / "lib.rs",
            deps,
            cfg,
            is_workspace_member=False,
        )

# 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", []))
    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",
        ["core"],
    )

append_crate(
        "alloc",
        srctree / "rust" / "alloc" / "lib.rs",
        ["core", "compiler_builtins"],
        cfg=crates_cfgs.get("alloc", []),
    )

append_crate(
        "macros",
        srctree / "rust" / "macros" / "lib.rs",
        ["std", "proc_macro"],
        is_proc_macro=True,
    )
    crates[-1]["proc_macro_dylib_path"] = f"{objtree}/rust/libmacros.so"

append_crate(
        "build_error",
        srctree / "rust" / "build_error.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"])
    append_crate_with_generated("uapi", ["core"])
    append_crate_with_generated("kernel", ["core", "alloc", "macros", "build_error", "bindings", "uapi"])

scripts = srctree / "scripts"
    makefile = (scripts / "Makefile").read_text()
    for path in scripts.glob("*.rs"):
        name = path.stem
        if f"{name}-rust" not in makefile:
            continue
        append_crate(
            name,
            path,
            ["std"],
        )

def is_root_crate(build_file, target):
        try:
            contents = build_file.read_text()
        except FileNotFoundError:
            return False
        return f"{target}.o" in contents

# 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.stem

# 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", "alloc", "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("srctree", type=pathlib.Path)
    parser.add_argument("objtree", 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
    )

rust_project = {
        "crates": generate_crates(args.srctree, args.objtree, args.sysroot_src, args.exttree, args.cfgs),
        "sysroot_src": str(args.sysroot_src),
    }

json.dump(rust_project, sys.stdout, sort_keys=True, indent=4)

if __name__ == "__main__":
    main()