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"""This file implements an experimental, do-not-use-kind of rust_proto_library.
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|
Disclaimer: This project is experimental, under heavy development, and should not
|
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|
be used yet."""
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# buildifier: disable=bzl-visibility
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|
load("@rules_rust//rust/private:providers.bzl", "CrateInfo", "DepInfo", "DepVariantInfo")
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# buildifier: disable=bzl-visibility
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|
load("@rules_rust//rust/private:rustc.bzl", "rustc_compile_action")
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|
load("@rules_rust//rust:defs.bzl", "rust_common")
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|
load("@upb//bazel:upb_proto_library.bzl", "UpbWrappedCcInfo", "upb_proto_library_aspect")
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load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain")
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proto_common = proto_common_do_not_use
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visibility(["//rust/..."])
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RustProtoInfo = provider(
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doc = "Rust protobuf provider info",
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fields = {
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"dep_variant_info": "DepVariantInfo for the compiled Rust gencode (also covers its " +
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|
"transitive dependencies)",
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},
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)
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def _generate_rust_gencode(
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ctx,
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proto_info,
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proto_lang_toolchain,
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is_upb):
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"""Generates Rust gencode
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|
This function uses proto_common APIs and a ProtoLangToolchain to register an action
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|
that invokes protoc with the right flags.
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|
Args:
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|
|
ctx (RuleContext): current rule context
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|
proto_info (ProtoInfo): ProtoInfo of the proto_library target for which we are generating
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|
gencode
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|
proto_lang_toolchain (ProtoLangToolchainInfo): proto lang toolchain for Rust
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|
is_upb (Bool): True when generating gencode for UPB, False otherwise.
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|
Returns:
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|
rs_outputs (([File], [File]): tuple(generated Rust files, generated C++ thunks).
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|
"""
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actions = ctx.actions
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rs_outputs = proto_common.declare_generated_files(
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actions = actions,
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|
proto_info = proto_info,
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|
extension = ".{}.pb.rs".format("u" if is_upb else "c"),
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|
)
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if is_upb:
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cc_outputs = []
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else:
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|
cc_outputs = proto_common.declare_generated_files(
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actions = actions,
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|
proto_info = proto_info,
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|
extension = ".pb.thunks.cc",
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|
)
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|
proto_common.compile(
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actions = ctx.actions,
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proto_info = proto_info,
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|
generated_files = rs_outputs + cc_outputs,
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|
proto_lang_toolchain_info = proto_lang_toolchain,
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|
plugin_output = ctx.bin_dir.path,
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|
)
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|
return (rs_outputs, cc_outputs)
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def _get_crate_info(providers):
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|
for provider in providers:
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|
|
if hasattr(provider, "name"):
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|
return provider
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|
fail("Couldn't find a CrateInfo in the list of providers")
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|
def _get_dep_info(providers):
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|
|
for provider in providers:
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|
|
if hasattr(provider, "direct_crates"):
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|
return provider
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|
fail("Couldn't find a DepInfo in the list of providers")
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|
def _get_cc_info(providers):
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|
|
for provider in providers:
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|
|
if hasattr(provider, "linking_context"):
|
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|
return provider
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|
fail("Couldn't find a CcInfo in the list of providers")
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|
|
def _compile_cc(
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|
|
ctx,
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|
attr,
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|
cc_toolchain,
|
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|
|
feature_configuration,
|
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|
src,
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|
cc_infos):
|
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|
|
"""Compiles a C++ source file.
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|
|
|
Args:
|
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|
|
ctx: The rule context.
|
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|
|
attr: The current rule's attributes.
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|
|
cc_toolchain: A cc_toolchain.
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|
|
feature_configuration: A feature configuration.
|
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|
|
src: The source file to be compiled.
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|
|
cc_infos: List[CcInfo]: A list of CcInfo dependencies.
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|
|
|
|
|
|
Returns:
|
|
|
|
A CcInfo provider.
|
|
|
|
"""
|
|
|
|
cc_info = cc_common.merge_cc_infos(direct_cc_infos = cc_infos)
|
|
|
|
|
|
|
|
(compilation_context, compilation_outputs) = cc_common.compile(
|
|
|
|
name = src.basename,
|
|
|
|
actions = ctx.actions,
|
|
|
|
feature_configuration = feature_configuration,
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|
|
|
cc_toolchain = cc_toolchain,
|
|
|
|
srcs = [src],
|
|
|
|
user_compile_flags = attr.copts if hasattr(attr, "copts") else [],
|
|
|
|
compilation_contexts = [cc_info.compilation_context],
|
|
|
|
)
|
|
|
|
|
|
|
|
(linking_context, _) = cc_common.create_linking_context_from_compilation_outputs(
|
|
|
|
name = src.basename,
|
|
|
|
actions = ctx.actions,
|
|
|
|
feature_configuration = feature_configuration,
|
|
|
|
cc_toolchain = cc_toolchain,
|
|
|
|
compilation_outputs = compilation_outputs,
|
|
|
|
linking_contexts = [cc_info.linking_context],
|
|
|
|
)
|
|
|
|
|
|
|
|
return CcInfo(
|
|
|
|
compilation_context = compilation_context,
|
|
|
|
linking_context = linking_context,
|
|
|
|
)
|
|
|
|
|
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|
|
def _compile_rust(ctx, attr, src, extra_srcs, deps):
|
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|
|
"""Compiles a Rust source file.
|
|
|
|
|
|
|
|
Eventually this function could be upstreamed into rules_rust and be made present in rust_common.
|
|
|
|
|
|
|
|
Args:
|
|
|
|
ctx (RuleContext): The rule context.
|
|
|
|
attr (Attrs): The current rule's attributes (`ctx.attr` for rules, `ctx.rule.attr` for aspects)
|
|
|
|
src (File): The crate root source file to be compiled.
|
|
|
|
extra_srcs ([File]): Additional source files to include in the crate.
|
|
|
|
deps (List[DepVariantInfo]): A list of dependencies needed.
|
|
|
|
|
|
|
|
Returns:
|
|
|
|
A DepVariantInfo provider.
|
|
|
|
"""
|
|
|
|
toolchain = ctx.toolchains["@rules_rust//rust:toolchain"]
|
|
|
|
output_hash = repr(hash(src.path))
|
|
|
|
|
|
|
|
# TODO(b/270124215): Use the import! macro once available
|
|
|
|
crate_name = ctx.label.name.replace("-", "_")
|
|
|
|
|
|
|
|
lib_name = "{prefix}{name}-{lib_hash}{extension}".format(
|
|
|
|
prefix = "lib",
|
|
|
|
name = crate_name,
|
|
|
|
lib_hash = output_hash,
|
|
|
|
extension = ".rlib",
|
|
|
|
)
|
|
|
|
|
|
|
|
rmeta_name = "{prefix}{name}-{lib_hash}{extension}".format(
|
|
|
|
prefix = "lib",
|
|
|
|
name = crate_name,
|
|
|
|
lib_hash = output_hash,
|
|
|
|
extension = ".rmeta",
|
|
|
|
)
|
|
|
|
|
|
|
|
lib = ctx.actions.declare_file(lib_name)
|
|
|
|
rmeta = ctx.actions.declare_file(rmeta_name)
|
|
|
|
|
|
|
|
# TODO(b/270125787): Use higher level rules_rust API once available.
|
|
|
|
providers = rustc_compile_action(
|
|
|
|
ctx = ctx,
|
|
|
|
attr = attr,
|
|
|
|
toolchain = toolchain,
|
|
|
|
crate_info = rust_common.create_crate_info(
|
|
|
|
name = crate_name,
|
|
|
|
type = "rlib",
|
|
|
|
root = src,
|
|
|
|
srcs = depset([src] + extra_srcs),
|
|
|
|
deps = depset(deps),
|
|
|
|
proc_macro_deps = depset([]),
|
|
|
|
aliases = {},
|
|
|
|
output = lib,
|
|
|
|
metadata = rmeta,
|
|
|
|
edition = "2021",
|
|
|
|
is_test = False,
|
|
|
|
rustc_env = {},
|
|
|
|
compile_data = depset([]),
|
|
|
|
compile_data_targets = depset([]),
|
|
|
|
owner = ctx.label,
|
|
|
|
),
|
|
|
|
output_hash = output_hash,
|
|
|
|
)
|
|
|
|
|
|
|
|
return DepVariantInfo(
|
|
|
|
crate_info = _get_crate_info(providers),
|
|
|
|
dep_info = _get_dep_info(providers),
|
|
|
|
cc_info = _get_cc_info(providers),
|
|
|
|
build_info = None,
|
|
|
|
)
|
|
|
|
|
|
|
|
def _is_cc_proto_library(rule):
|
|
|
|
"""Detects if the current rule is a cc_proto_library."""
|
|
|
|
return rule.kind == "cc_proto_library"
|
|
|
|
|
|
|
|
def _rust_upb_proto_aspect_impl(target, ctx):
|
|
|
|
"""Implements the Rust protobuf aspect logic for UPB kernel."""
|
|
|
|
return _rust_proto_aspect_common(target, ctx, is_upb = True)
|
|
|
|
|
|
|
|
def _rust_cc_proto_aspect_impl(target, ctx):
|
|
|
|
"""Implements the Rust protobuf aspect logic for C++ kernel."""
|
|
|
|
return _rust_proto_aspect_common(target, ctx, is_upb = False)
|
|
|
|
|
|
|
|
def _rust_proto_aspect_common(target, ctx, is_upb):
|
|
|
|
if RustProtoInfo in target:
|
|
|
|
return []
|
|
|
|
|
|
|
|
if _is_cc_proto_library(ctx.rule):
|
|
|
|
# This is cc_proto_library, but we need the RustProtoInfo provider of the proto_library that
|
|
|
|
# this aspect provides. Luckily this aspect has already been attached on the proto_library
|
|
|
|
# so we can just read the provider.
|
|
|
|
return [ctx.rule.attr.deps[0][RustProtoInfo]]
|
|
|
|
|
|
|
|
proto_lang_toolchain = ctx.attr._proto_lang_toolchain[proto_common.ProtoLangToolchainInfo]
|
|
|
|
cc_toolchain = find_cpp_toolchain(ctx)
|
|
|
|
|
|
|
|
feature_configuration = cc_common.configure_features(
|
|
|
|
ctx = ctx,
|
|
|
|
cc_toolchain = cc_toolchain,
|
|
|
|
requested_features = ctx.features,
|
|
|
|
unsupported_features = ctx.disabled_features,
|
|
|
|
)
|
|
|
|
|
|
|
|
(gencode, thunks) = _generate_rust_gencode(
|
|
|
|
ctx,
|
|
|
|
target[ProtoInfo],
|
|
|
|
proto_lang_toolchain,
|
|
|
|
is_upb,
|
|
|
|
)
|
|
|
|
|
|
|
|
if is_upb:
|
|
|
|
thunks_cc_info = target[UpbWrappedCcInfo].cc_info_with_thunks
|
|
|
|
else:
|
|
|
|
thunks_cc_info = cc_common.merge_cc_infos(cc_infos = [_compile_cc(
|
|
|
|
feature_configuration = feature_configuration,
|
|
|
|
src = thunk,
|
|
|
|
ctx = ctx,
|
|
|
|
attr = attr,
|
|
|
|
cc_toolchain = cc_toolchain,
|
|
|
|
cc_infos = [target[CcInfo], ctx.attr._cpp_thunks_deps[CcInfo]],
|
|
|
|
) for thunk in thunks])
|
|
|
|
|
|
|
|
runtime = proto_lang_toolchain.runtime
|
|
|
|
dep_variant_info_for_runtime = DepVariantInfo(
|
|
|
|
crate_info = runtime[CrateInfo] if CrateInfo in runtime else None,
|
|
|
|
dep_info = runtime[DepInfo] if DepInfo in runtime else None,
|
|
|
|
cc_info = runtime[CcInfo] if CcInfo in runtime else None,
|
|
|
|
build_info = None,
|
|
|
|
)
|
|
|
|
dep_variant_info_for_native_gencode = DepVariantInfo(cc_info = thunks_cc_info)
|
|
|
|
|
|
|
|
proto_dep = getattr(ctx.rule.attr, "deps", [])
|
|
|
|
dep_variant_info = _compile_rust(
|
|
|
|
ctx = ctx,
|
|
|
|
attr = ctx.rule.attr,
|
|
|
|
src = gencode[0],
|
|
|
|
extra_srcs = gencode[1:],
|
|
|
|
deps = [dep_variant_info_for_runtime, dep_variant_info_for_native_gencode] + (
|
|
|
|
[proto_dep[0][RustProtoInfo].dep_variant_info] if proto_dep else []
|
|
|
|
),
|
|
|
|
)
|
|
|
|
return [RustProtoInfo(dep_variant_info = dep_variant_info)]
|
|
|
|
|
|
|
|
def _make_proto_library_aspect(is_upb):
|
|
|
|
return aspect(
|
|
|
|
implementation = (_rust_upb_proto_aspect_impl if is_upb else _rust_cc_proto_aspect_impl),
|
|
|
|
attr_aspects = ["deps"],
|
|
|
|
# Since we can reference upb_proto_library_aspect by name, we can just ask Bazel to attach
|
|
|
|
# it here.
|
|
|
|
requires = ([upb_proto_library_aspect] if is_upb else []),
|
|
|
|
required_aspect_providers = ([] if is_upb else [CcInfo]),
|
|
|
|
attrs = {
|
|
|
|
"_cc_toolchain": attr.label(
|
|
|
|
doc = (
|
|
|
|
"In order to use find_cc_toolchain, your rule has to depend " +
|
|
|
|
"on C++ toolchain. See `@rules_cc//cc:find_cc_toolchain.bzl` " +
|
|
|
|
"docs for details."
|
|
|
|
),
|
|
|
|
default = Label("@bazel_tools//tools/cpp:current_cc_toolchain"),
|
|
|
|
),
|
|
|
|
"_collect_cc_coverage": attr.label(
|
|
|
|
default = Label("@rules_rust//util:collect_coverage"),
|
|
|
|
executable = True,
|
|
|
|
cfg = "exec",
|
|
|
|
),
|
|
|
|
"_cpp_thunks_deps": attr.label(
|
|
|
|
default = Label("//rust/cpp_kernel:cpp_api"),
|
|
|
|
),
|
|
|
|
"_grep_includes": attr.label(
|
|
|
|
allow_single_file = True,
|
|
|
|
default = Label("@bazel_tools//tools/cpp:grep-includes"),
|
|
|
|
cfg = "exec",
|
|
|
|
),
|
|
|
|
"_error_format": attr.label(
|
|
|
|
default = Label("@rules_rust//:error_format"),
|
|
|
|
),
|
|
|
|
"_extra_exec_rustc_flag": attr.label(
|
|
|
|
default = Label("@rules_rust//:extra_exec_rustc_flag"),
|
|
|
|
),
|
|
|
|
"_extra_exec_rustc_flags": attr.label(
|
|
|
|
default = Label("@rules_rust//:extra_exec_rustc_flags"),
|
|
|
|
),
|
|
|
|
"_extra_rustc_flag": attr.label(
|
|
|
|
default = Label("@rules_rust//:extra_rustc_flag"),
|
|
|
|
),
|
|
|
|
"_extra_rustc_flags": attr.label(
|
|
|
|
default = Label("@rules_rust//:extra_rustc_flags"),
|
|
|
|
),
|
|
|
|
"_process_wrapper": attr.label(
|
|
|
|
doc = "A process wrapper for running rustc on all platforms.",
|
|
|
|
default = Label("@rules_rust//util/process_wrapper"),
|
|
|
|
executable = True,
|
|
|
|
allow_single_file = True,
|
|
|
|
cfg = "exec",
|
|
|
|
),
|
|
|
|
"_proto_lang_toolchain": attr.label(
|
|
|
|
default = Label(("//rust:proto_rust_upb_toolchain" if is_upb else "//rust:proto_rust_cpp_toolchain")),
|
|
|
|
),
|
|
|
|
},
|
|
|
|
fragments = ["cpp"],
|
|
|
|
host_fragments = ["cpp"],
|
|
|
|
toolchains = [
|
|
|
|
str(Label("@rules_rust//rust:toolchain")),
|
|
|
|
"@bazel_tools//tools/cpp:toolchain_type",
|
|
|
|
],
|
|
|
|
incompatible_use_toolchain_transition = True,
|
|
|
|
)
|
|
|
|
|
|
|
|
rust_upb_proto_library_aspect = _make_proto_library_aspect(is_upb = True)
|
|
|
|
rust_cc_proto_library_aspect = _make_proto_library_aspect(is_upb = False)
|