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protobuf/bazel/upb_proto_library.bzl

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# Copyright (c) 2009-2021, Google LLC
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of Google LLC nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Public rules for using upb protos:
- upb_proto_library()
- upb_proto_reflection_library()
"""
load("@bazel_skylib//lib:paths.bzl", "paths")
# begin:google_only
# load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain", "use_cpp_toolchain")
# end:google_only
# begin:github_only
# Compatibility code for Bazel 4.x. Remove this when we drop support for Bazel 4.x.
load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain")
def use_cpp_toolchain():
return ["@bazel_tools//tools/cpp:toolchain_type"]
# end:github_only
# Generic support code #########################################################
# begin:github_only
_is_google3 = False
# end:github_only
# begin:google_only
# _is_google3 = True
# end:google_only
def _get_real_short_path(file):
# For some reason, files from other archives have short paths that look like:
# ../com_google_protobuf/google/protobuf/descriptor.proto
short_path = file.short_path
if short_path.startswith("../"):
second_slash = short_path.index("/", 3)
short_path = short_path[second_slash + 1:]
# Sometimes it has another few prefixes like:
# _virtual_imports/any_proto/google/protobuf/any.proto
# benchmarks/_virtual_imports/100_msgs_proto/benchmarks/100_msgs.proto
# We want just google/protobuf/any.proto.
virtual_imports = "_virtual_imports/"
if virtual_imports in short_path:
short_path = short_path.split(virtual_imports)[1].split("/", 1)[1]
return short_path
def _get_real_root(ctx, file):
real_short_path = _get_real_short_path(file)
root = file.path[:-len(real_short_path) - 1]
if not _is_google3 and ctx.rule.attr.strip_import_prefix:
root = paths.join(root, ctx.rule.attr.strip_import_prefix[1:])
return root
def _generate_output_file(ctx, src, extension):
package = ctx.label.package
if not _is_google3:
strip_import_prefix = ctx.rule.attr.strip_import_prefix
if strip_import_prefix and strip_import_prefix != "/":
if not package.startswith(strip_import_prefix[1:]):
fail("%s does not begin with prefix %s" % (package, strip_import_prefix))
package = package[len(strip_import_prefix):]
real_short_path = _get_real_short_path(src)
real_short_path = paths.relativize(real_short_path, package)
output_filename = paths.replace_extension(real_short_path, extension)
ret = ctx.actions.declare_file(output_filename)
return ret
def _generate_include_path(src, out, extension):
short_path = _get_real_short_path(src)
short_path = paths.replace_extension(short_path, extension)
if not out.path.endswith(short_path):
fail("%s does not end with %s" % (out.path, short_path))
return out.path[:-len(short_path)]
def _filter_none(elems):
out = []
for elem in elems:
if elem:
out.append(elem)
return out
def _cc_library_func(ctx, name, hdrs, srcs, copts, includes, dep_ccinfos):
"""Like cc_library(), but callable from rules.
Args:
ctx: Rule context.
name: Unique name used to generate output files.
hdrs: Public headers that can be #included from other rules.
srcs: C/C++ source files.
copts: Additional options for cc compilation.
includes: Additional include paths.
dep_ccinfos: CcInfo providers of dependencies we should build/link against.
Returns:
CcInfo provider for this compilation.
"""
compilation_contexts = [info.compilation_context for info in dep_ccinfos]
linking_contexts = [info.linking_context for info in dep_ccinfos]
toolchain = find_cpp_toolchain(ctx)
feature_configuration = cc_common.configure_features(
ctx = ctx,
cc_toolchain = toolchain,
requested_features = ctx.features,
unsupported_features = ctx.disabled_features,
)
blaze_only_args = {}
if _is_google3:
blaze_only_args["grep_includes"] = ctx.file._grep_includes
(compilation_context, compilation_outputs) = cc_common.compile(
actions = ctx.actions,
feature_configuration = feature_configuration,
cc_toolchain = toolchain,
name = name,
srcs = srcs,
includes = includes,
public_hdrs = hdrs,
user_compile_flags = copts,
compilation_contexts = compilation_contexts,
**blaze_only_args
)
# buildifier: disable=unused-variable
(linking_context, linking_outputs) = cc_common.create_linking_context_from_compilation_outputs(
actions = ctx.actions,
name = name,
feature_configuration = feature_configuration,
cc_toolchain = toolchain,
compilation_outputs = compilation_outputs,
linking_contexts = linking_contexts,
**blaze_only_args
)
return CcInfo(
compilation_context = compilation_context,
linking_context = linking_context,
)
# Build setting for whether fasttable code generation is enabled ###############
_FastTableEnabledInfo = provider(
"Provides fasttable configuration",
fields = {
"enabled": "whether fasttable is enabled",
},
)
def fasttable_enabled_impl(ctx):
raw_setting = ctx.build_setting_value
if raw_setting:
# TODO(haberman): check that the target CPU supports fasttable.
pass
return _FastTableEnabledInfo(enabled = raw_setting)
upb_fasttable_enabled = rule(
implementation = fasttable_enabled_impl,
build_setting = config.bool(flag = True),
)
# Dummy rule to expose select() copts to aspects ##############################
UpbProtoLibraryCoptsInfo = provider(
"Provides copts for upb proto targets",
fields = {
"copts": "copts for upb_proto_library()",
},
)
def upb_proto_library_copts_impl(ctx):
return UpbProtoLibraryCoptsInfo(copts = ctx.attr.copts)
upb_proto_library_copts = rule(
implementation = upb_proto_library_copts_impl,
attrs = {"copts": attr.string_list(default = [])},
)
# upb_proto_library / upb_proto_reflection_library shared code #################
GeneratedSrcsInfo = provider(
"Provides generated headers and sources",
fields = {
"srcs": "list of srcs",
"hdrs": "list of hdrs",
"includes": "list of extra includes",
},
)
UpbWrappedCcInfo = provider("Provider for cc_info for protos", fields = ["cc_info"])
_UpbDefsWrappedCcInfo = provider("Provider for cc_info for protos", fields = ["cc_info"])
UpbWrappedGeneratedSrcsInfo = provider("Provider for generated sources", fields = ["srcs"])
_WrappedDefsGeneratedSrcsInfo = provider(
"Provider for generated reflective sources",
fields = ["srcs"],
)
def _compile_upb_protos(ctx, generator, proto_info, proto_sources):
if len(proto_sources) == 0:
return GeneratedSrcsInfo(srcs = [], hdrs = [], includes = [])
ext = "." + generator
tool = getattr(ctx.executable, "_gen_" + generator)
srcs = [_generate_output_file(ctx, name, ext + ".c") for name in proto_sources]
hdrs = [_generate_output_file(ctx, name, ext + ".h") for name in proto_sources]
transitive_sets = proto_info.transitive_descriptor_sets.to_list()
fasttable_enabled = (hasattr(ctx.attr, "_fasttable_enabled") and
ctx.attr._fasttable_enabled[_FastTableEnabledInfo].enabled)
codegen_params = "fasttable:" if fasttable_enabled else ""
ctx.actions.run(
inputs = depset(
direct = [proto_info.direct_descriptor_set],
transitive = [proto_info.transitive_descriptor_sets],
),
tools = [tool],
outputs = srcs + hdrs,
executable = ctx.executable._protoc,
arguments = [
"--" + generator + "_out=" + codegen_params + _get_real_root(ctx, srcs[0]),
"--plugin=protoc-gen-" + generator + "=" + tool.path,
"--descriptor_set_in=" + ctx.configuration.host_path_separator.join([f.path for f in transitive_sets]),
] +
[_get_real_short_path(file) for file in proto_sources],
progress_message = "Generating upb protos for :" + ctx.label.name,
mnemonic = "GenUpbProtos",
)
return GeneratedSrcsInfo(
srcs = srcs,
hdrs = hdrs,
includes = [_generate_include_path(proto_sources[0], hdrs[0], ext + ".h")],
)
def _upb_proto_rule_impl(ctx):
if len(ctx.attr.deps) != 1:
fail("only one deps dependency allowed.")
dep = ctx.attr.deps[0]
if _WrappedDefsGeneratedSrcsInfo in dep:
srcs = dep[_WrappedDefsGeneratedSrcsInfo].srcs
elif UpbWrappedGeneratedSrcsInfo in dep:
srcs = dep[UpbWrappedGeneratedSrcsInfo].srcs
else:
fail("proto_library rule must generate UpbWrappedGeneratedSrcsInfo or " +
"_WrappedDefsGeneratedSrcsInfo (aspect should have handled this).")
if _UpbDefsWrappedCcInfo in dep:
cc_info = dep[_UpbDefsWrappedCcInfo].cc_info
elif UpbWrappedCcInfo in dep:
cc_info = dep[UpbWrappedCcInfo].cc_info
else:
fail("proto_library rule must generate UpbWrappedCcInfo or " +
"_UpbDefsWrappedCcInfo (aspect should have handled this).")
lib = cc_info.linking_context.linker_inputs.to_list()[0].libraries[0]
files = _filter_none([
lib.static_library,
lib.pic_static_library,
lib.dynamic_library,
])
return [
DefaultInfo(files = depset(files + srcs.hdrs + srcs.srcs)),
srcs,
cc_info,
]
def _upb_proto_aspect_impl(target, ctx, generator, cc_provider, file_provider):
proto_info = target[ProtoInfo]
files = _compile_upb_protos(ctx, generator, proto_info, proto_info.direct_sources)
deps = ctx.rule.attr.deps + getattr(ctx.attr, "_" + generator)
dep_ccinfos = [dep[CcInfo] for dep in deps if CcInfo in dep]
dep_ccinfos += [dep[UpbWrappedCcInfo].cc_info for dep in deps if UpbWrappedCcInfo in dep]
dep_ccinfos += [dep[_UpbDefsWrappedCcInfo].cc_info for dep in deps if _UpbDefsWrappedCcInfo in dep]
if generator == "upbdefs":
if UpbWrappedCcInfo not in target:
fail("Target should have UpbWrappedCcInfo provider")
dep_ccinfos.append(target[UpbWrappedCcInfo].cc_info)
cc_info = _cc_library_func(
ctx = ctx,
name = ctx.rule.attr.name + "." + generator,
hdrs = files.hdrs,
srcs = files.srcs,
includes = files.includes,
copts = ctx.attr._copts[UpbProtoLibraryCoptsInfo].copts,
dep_ccinfos = dep_ccinfos,
)
return [cc_provider(cc_info = cc_info), file_provider(srcs = files)]
def upb_proto_library_aspect_impl(target, ctx):
return _upb_proto_aspect_impl(target, ctx, "upb", UpbWrappedCcInfo, UpbWrappedGeneratedSrcsInfo)
def _upb_proto_reflection_library_aspect_impl(target, ctx):
return _upb_proto_aspect_impl(target, ctx, "upbdefs", _UpbDefsWrappedCcInfo, _WrappedDefsGeneratedSrcsInfo)
def _maybe_add(d):
if _is_google3:
d["_grep_includes"] = attr.label(
allow_single_file = True,
cfg = "exec",
default = "@bazel_tools//tools/cpp:grep-includes",
)
return d
# upb_proto_library() ##########################################################
upb_proto_library_aspect = aspect(
attrs = _maybe_add({
"_copts": attr.label(
default = "//:upb_proto_library_copts__for_generated_code_only_do_not_use",
),
"_gen_upb": attr.label(
executable = True,
cfg = "exec",
default = "//upbc:protoc-gen-upb",
),
"_protoc": attr.label(
executable = True,
cfg = "exec",
default = "@com_google_protobuf//:protoc",
),
"_cc_toolchain": attr.label(
default = "@bazel_tools//tools/cpp:current_cc_toolchain",
),
"_upb": attr.label_list(default = [
"//:generated_code_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me",
]),
"_fasttable_enabled": attr.label(default = "//:fasttable_enabled"),
}),
implementation = upb_proto_library_aspect_impl,
provides = [
UpbWrappedCcInfo,
UpbWrappedGeneratedSrcsInfo,
],
attr_aspects = ["deps"],
fragments = ["cpp"],
toolchains = use_cpp_toolchain(),
incompatible_use_toolchain_transition = True,
)
upb_proto_library = rule(
output_to_genfiles = True,
implementation = _upb_proto_rule_impl,
attrs = {
"deps": attr.label_list(
aspects = [upb_proto_library_aspect],
allow_rules = ["proto_library"],
providers = [ProtoInfo],
),
},
)
# upb_proto_reflection_library() ###############################################
_upb_proto_reflection_library_aspect = aspect(
attrs = _maybe_add({
"_copts": attr.label(
default = "//:upb_proto_library_copts__for_generated_code_only_do_not_use",
),
"_gen_upbdefs": attr.label(
executable = True,
cfg = "exec",
default = "//upbc:protoc-gen-upbdefs",
),
"_protoc": attr.label(
executable = True,
cfg = "exec",
default = "@com_google_protobuf//:protoc",
),
"_cc_toolchain": attr.label(
default = "@bazel_tools//tools/cpp:current_cc_toolchain",
),
"_upbdefs": attr.label_list(
default = [
"//:generated_reflection_support__only_for_generated_code_do_not_use__i_give_permission_to_break_me",
],
),
}),
implementation = _upb_proto_reflection_library_aspect_impl,
provides = [
_UpbDefsWrappedCcInfo,
_WrappedDefsGeneratedSrcsInfo,
],
required_aspect_providers = [
UpbWrappedCcInfo,
UpbWrappedGeneratedSrcsInfo,
],
attr_aspects = ["deps"],
fragments = ["cpp"],
toolchains = use_cpp_toolchain(),
incompatible_use_toolchain_transition = True,
)
upb_proto_reflection_library = rule(
output_to_genfiles = True,
implementation = _upb_proto_rule_impl,
attrs = {
"deps": attr.label_list(
aspects = [
upb_proto_library_aspect,
_upb_proto_reflection_library_aspect,
],
allow_rules = ["proto_library"],
providers = [ProtoInfo],
),
},
)