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# Copyright (C) 2017 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import("perfetto.gni")
import("perfetto_component.gni")
# This gni file defines rules for proto generation. There are various types of
# proto targets that can be defined in our codebase:
# "lite" targets: these use the standard libprotobuf library. They are used
# mainly for tests and readback.
# "zero" targets: these use the protozero library and its protoc plugin. They
# are used pretty much everywhere.
# "descriptor" targets: they are used to generate a proto-encoded reflection
# descriptor that describes the schema of the proto using protobuf itself.
# All these targets can be generated using the perfetto_proto_library rule. It
# wraps the instantiation of several proto targets using a convenience template.
#
# For instance:
# perfetto_proto_library("xxx_@TYPE@") {
# proto_generators = [ "lite", "zero" ] # lite+zero+cpp is the default value.
# sources = [ "one.proto", "two.proto" ]
# deps = [ "dep:@TYPE@" ]
# }
#
# Is the equivalent of:
# proto_library("xxx_lite") { sources = [...], deps = [ "dep:lite"] }
# protozero_library("xxx_zero") { sources = [...], deps = [ "dep:zero"] }
# Load the protobuf's proto_library() definition.
if (!defined(perfetto_protobuf_target_prefix)) {
if (perfetto_root_path == "//") {
perfetto_protobuf_target_prefix = "//buildtools"
} else {
perfetto_protobuf_target_prefix = "//third_party/protobuf"
}
}
if (!defined(perfetto_protobuf_gni)) {
if (perfetto_root_path == "//") {
perfetto_protobuf_gni = "//gn/standalone/proto_library.gni"
} else {
perfetto_protobuf_gni = "//third_party/protobuf/proto_library.gni"
}
}
if (!defined(perfetto_protobuf_src_dir)) {
if (perfetto_root_path == "//") {
perfetto_protobuf_src_dir = "//buildtools/protobuf/src"
} else {
perfetto_protobuf_src_dir = "//third_party/protobuf/src"
}
}
import(perfetto_protobuf_gni)
# Equivalent to proto_library (generation of .h/.cc from .proto files) but
# enables also generation using the protozero plugin.
# The generated files will have the .pbzero.{cc,h} suffix, as opposed to the
# .pb.{cc,h} of the official proto library.
# DO NOT use this target directly, use perfetto_proto_library() below.
template("protozero_library") {
proto_library(target_name) {
perfetto_root_path = invoker.perfetto_root_path
generate_cc = false
generate_python = false
generator_plugin_label =
perfetto_root_path + "src/protozero/protoc_plugin:protozero_plugin"
generator_plugin_suffix = ".pbzero"
if (build_with_chromium) {
component_build_force_source_set = true
}
if (defined(invoker.deps)) {
deps = invoker.deps
} else {
deps = []
}
# omit_protozero_dep is intended to be used when protozero_library
# is used in Chrome (for generation of code for proto extensions)
# to avoid ODR violations in case of component builds. The embedder
# (Chrome) is then responsible for adding the appropriate transitive
# dependency on Protozero.
#
# TODO(b/173041866): use fine-grained components instead when available
if (!(defined(invoker.omit_protozero_dep) && invoker.omit_protozero_dep)) {
deps += [ perfetto_root_path + "src/protozero" ]
}
forward_variables_from(invoker,
[
"defines",
"generator_plugin_options",
"include_dirs",
"proto_in_dir",
"proto_out_dir",
"sources",
"testonly",
"visibility",
"generate_descriptor",
"propagate_imports_configs",
"import_dirs",
])
}
}
# This template generates .gen.cc/h files from .proto files. The generated
# sources are actual C++ classes that can be moved and copied around, very
# similar to the libprotobuf generated ones API-wise, but use protozero under
# the hoods, without any zero-copy benefit though.
# They are mainly used for the perfetto IPC layer and tests.
template("protozero_cpp_library") {
proto_library(target_name) {
perfetto_root_path = invoker.perfetto_root_path
generate_cc = false
generate_python = false
generator_plugin_label =
perfetto_root_path + "src/protozero/protoc_plugin:cppgen_plugin"
generator_plugin_suffix = ".gen"
if (build_with_chromium) {
component_build_force_source_set = true
}
deps = [
"$perfetto_root_path/gn:default_deps",
"$perfetto_root_path/include/perfetto/base",
"$perfetto_root_path/src/protozero",
]
if (defined(invoker.deps)) {
deps += invoker.deps
}
forward_variables_from(invoker,
[
"defines",
"generator_plugin_options",
"include_dirs",
"proto_in_dir",
"proto_out_dir",
"sources",
"testonly",
"visibility",
"generate_descriptor",
"propagate_imports_configs",
"import_dirs",
])
}
}
# Generates .ipc.{h,cc} stubs for IPC services defined in .proto files.
template("ipc_library") {
proto_library(target_name) {
perfetto_root_path = invoker.perfetto_root_path
generate_cc = false
generate_python = false
generator_plugin_label =
"$perfetto_root_path/src/ipc/protoc_plugin:ipc_plugin"
generator_plugin_suffix = ".ipc"
deps = [ "$perfetto_root_path/gn:default_deps" ]
if (perfetto_component_type == "static_library") {
deps += [ "$perfetto_root_path/src/ipc:perfetto_ipc" ]
} else {
deps += [ "$perfetto_root_path/src/ipc:common" ]
}
if (is_win) {
# TODO(primiano): investigate this. In Windows standalone builds, some
# executable targets end up in a state where no code pulls a dep on the
# ipc:client (in turn that seems a subtle consequence of not having
# traced_probes on Windows). This dep here is effectively needed because
# the client-side code in the generated .ipc.cc effectively depends on the
# client-side IPC library. Perhaps we just should do this unconditionally
# on all platforms?
deps += [ "$perfetto_root_path/src/ipc:client" ]
}
if (defined(invoker.deps)) {
deps += invoker.deps
}
forward_variables_from(invoker,
[
"defines",
"extra_configs",
"include_dirs",
"proto_in_dir",
"proto_out_dir",
"generator_plugin_options",
"sources",
"testonly",
"visibility",
"propagate_imports_configs",
"import_dirs",
])
}
}
# The template used everywhere in the codebase.
template("perfetto_proto_library") {
if (defined(invoker.proto_generators)) {
proto_generators = invoker.proto_generators
} else {
proto_generators = [
"zero",
"lite",
"cpp",
"source_set",
]
}
# proto imports and C++ #includes are relative to this path.
if (defined(invoker.proto_path)) {
proto_path = invoker.proto_path
} else {
proto_path = perfetto_root_path
}
if (defined(invoker.import_dirs)) {
import_dirs_ = invoker.import_dirs
} else {
import_dirs_ = []
}
vars_to_forward = [
"sources",
"visibility",
"testonly",
"exclude_imports",
]
expansion_token = "@TYPE@"
# gn:public_config propagates the gen dir as include directory. We
# disable the proto_library's public_config to avoid duplicate include
# directory command line flags (crbug.com/1043279, crbug.com/gn/142).
propagate_imports_configs_ = false
foreach(gen_type, proto_generators) {
target_name_ = string_replace(target_name, expansion_token, gen_type)
# Translate deps from xxx:@TYPE@ to xxx:lite/zero.
deps_ = []
if (defined(invoker.deps)) {
foreach(dep, invoker.deps) {
deps_ += [ string_replace(dep, expansion_token, gen_type) ]
}
}
# The distinction between deps and public_deps does not matter for GN
# but Bazel cares about the difference so we distinguish between the two.
public_deps_ = []
if (defined(invoker.public_deps)) {
foreach(dep, invoker.public_deps) {
public_deps_ = [ string_replace(dep, expansion_token, gen_type) ]
}
}
deps_ += public_deps_
if (gen_type == "zero") {
protozero_library(target_name_) {
proto_in_dir = proto_path
proto_out_dir = proto_path
generator_plugin_options = "wrapper_namespace=pbzero"
deps = deps_
propagate_imports_configs = propagate_imports_configs_
import_dirs = import_dirs_
forward_variables_from(invoker, vars_to_forward)
}
} else if (gen_type == "cpp") {
protozero_cpp_library(target_name_) {
proto_in_dir = proto_path
proto_out_dir = proto_path
generator_plugin_options = "wrapper_namespace=gen"
deps = deps_
propagate_imports_configs = propagate_imports_configs_
import_dirs = import_dirs_
forward_variables_from(invoker, vars_to_forward)
}
} else if (gen_type == "ipc") {
cpp_target_name_ = string_replace(target_name, expansion_token, "cpp")
ipc_library(target_name_) {
proto_in_dir = proto_path
proto_out_dir = proto_path
generator_plugin_options = "wrapper_namespace=gen"
deps = deps_ + [ ":$cpp_target_name_" ]
propagate_imports_configs = propagate_imports_configs_
import_dirs = import_dirs_
forward_variables_from(invoker, vars_to_forward)
}
} else if (gen_type == "lite") {
proto_library(target_name_) {
proto_in_dir = proto_path
proto_out_dir = proto_path
generate_python = false
deps = deps_
cc_generator_options = "lite=true:"
propagate_imports_configs = propagate_imports_configs_
import_dirs = import_dirs_
forward_variables_from(invoker, vars_to_forward)
}
} else if (gen_type == "descriptor") {
proto_library(target_name_) {
proto_in_dir = proto_path
proto_out_dir = proto_path
generate_python = false
generate_cc = false
generate_descriptor =
rebase_path(invoker.generate_descriptor, proto_path)
deps = deps_
import_dirs = import_dirs_
forward_variables_from(invoker, vars_to_forward)
}
# Not needed for descriptor proto_library target.
not_needed([ "propagate_imports_configs_" ])
} else if (gen_type == "source_set") {
action(target_name_) {
out_path = "$target_gen_dir/" + target_name_
rebased_out_path =
rebase_path(target_gen_dir, root_build_dir) + "/" + target_name_
script = "$perfetto_root_path/tools/touch_file.py"
args = [
"--output",
rebased_out_path,
]
outputs = [ out_path ]
deps = deps_
metadata = {
proto_library_sources = invoker.sources
import_dirs = import_dirs_
exports = get_path_info(public_deps_, "abspath")
}
forward_variables_from(invoker, vars_to_forward)
}
# Not needed for source_set proto_library target.
not_needed([
"propagate_imports_configs_",
"proto_path",
])
} else {
assert(false, "Invalid 'proto_generators' value.")
}
}
}