build/RunCbindgen.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this
   3 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
   4
   5 import os
   6 import subprocess
   7
   8 import buildconfig
   9 import mozpack.path as mozpath
  10 import six
  11 import toml
  12
  13
  14 # Try to read the package name or otherwise assume same name as the crate path.
  15 def _get_crate_name(crate_path):
  16     try:
  17         with open(mozpath.join(crate_path, "Cargo.toml"), encoding="utf-8") as f:
  18             return toml.load(f)["package"]["name"]
  19     except Exception:
  20         return mozpath.basename(crate_path)
  21
  22
  23 CARGO_LOCK = mozpath.join(buildconfig.topsrcdir, "Cargo.lock")
  24 CARGO_TOML = mozpath.join(buildconfig.topsrcdir, "Cargo.toml")
  25
  26
  27 def _run_process(args):
  28     env = os.environ.copy()
  29     env["CARGO"] = str(buildconfig.substs["CARGO"])
  30     env["RUSTC"] = str(buildconfig.substs["RUSTC"])
  31
  32     p = subprocess.Popen(args, env=env, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  33
  34     stdout, stderr = p.communicate()
  35     stdout = six.ensure_text(stdout)
  36     stderr = six.ensure_text(stderr)
  37     if p.returncode != 0:
  38         print(stdout)
  39         print(stderr)
  40     return (stdout, p.returncode)
  41
  42
  43 def generate_metadata(output, cargo_config):
  44     args = [
  45         buildconfig.substs["CARGO"],
  46         "metadata",
  47         "--all-features",
  48         "--format-version",
  49         "1",
  50         "--manifest-path",
  51         CARGO_TOML,
  52     ]
  53
  54     # The Spidermonkey library can be built from a package tarball outside the
  55     # tree, so we want to let Cargo create lock files in this case. When built
  56     # within a tree, the Rust dependencies have been vendored in so Cargo won't
  57     # touch the lock file.
  58     if not buildconfig.substs.get("JS_STANDALONE"):
  59         args.append("--frozen")
  60
  61     stdout, returncode = _run_process(args)
  62
  63     if returncode != 0:
  64         return returncode
  65
  66     output.write(stdout)
  67
  68     # This is not quite accurate, but cbindgen only cares about a subset of the
  69     # data which, when changed, causes these files to change.
  70     return set([CARGO_LOCK, CARGO_TOML])
  71
  72
  73 def generate(output, metadata_path, cbindgen_crate_path, *in_tree_dependencies):
  74     stdout, returncode = _run_process(
  75         [
  76             buildconfig.substs["CBINDGEN"],
  77             buildconfig.topsrcdir,
  78             "--lockfile",
  79             CARGO_LOCK,
  80             "--crate",
  81             _get_crate_name(cbindgen_crate_path),
  82             "--metadata",
  83             metadata_path,
  84             "--cpp-compat",
  85         ]
  86     )
  87
  88     if returncode != 0:
  89         return returncode
  90
  91     output.write(stdout)
  92
  93     deps = set()
  94     deps.add(CARGO_LOCK)
  95     deps.add(mozpath.join(cbindgen_crate_path, "cbindgen.toml"))
  96     for directory in in_tree_dependencies + (cbindgen_crate_path,):
  97         for path, dirs, files in os.walk(directory):
  98             for file in files:
  99                 if os.path.splitext(file)[1] == ".rs":
 100                     deps.add(mozpath.join(path, file))
 101
 102     return deps