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# Copyright 2019 The Dawn & Tint Authors
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. 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.
#
# 3. Neither the name of the copyright holder 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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.
# Template to help invoking code generators based on generator_lib.py
# Internal use only, this should only be called from templates implementing
# generator-specific actions.
#
# Variables:
# script: Path to generator script.
#
# args: List of extra command-line arguments passed to the generator.
#
# outputs: List of expected outputs, generation will fail if there is a
# mistmatch.
#
# deps: additional deps for the code generation targets.
#
# generator_lib_dir: directory where generator_lib.py is located.
#
# custom_gen_dir: Optional custom target gen dir. Defaults to $target_gen_dir
# but allows output files to not depend on the location of the BUILD.gn
# that generates them.
#
# template_dir: Optional template root directory. Defaults to
# "${generator_lib_dir}/templates".
#
# jinja2_path: Optional Jinja2 installation path.
#
# root_dir: Optional root source dir for Python dependencies
# computation. Defaults to "${generator_lib_dir}/..". Any dependency
# outside of this directory is considered a system file and will be
# omitted.
#
template("generator_lib_action") {
_generator_args = []
if (defined(invoker.args)) {
_generator_args += invoker.args
}
assert(defined(invoker.generator_lib_dir),
"generator_lib_dir must be defined before calling this action!")
_template_dir = "${invoker.generator_lib_dir}/templates"
if (defined(invoker.template_dir)) {
_template_dir = invoker.template_dir
}
_generator_args += [
"--template-dir",
rebase_path(_template_dir, root_build_dir),
]
if (defined(invoker.root_dir)) {
_generator_args += [
"--root-dir",
rebase_path(_root_dir, root_build_dir),
]
}
if (defined(invoker.jinja2_path)) {
_generator_args += [
"--jinja2-path",
rebase_path(invoker.jinja2_path, root_build_dir),
]
}
# Chooses either the default gen_dir or the custom one required by the
# invoker. This allows moving the definition of code generators in different
# BUILD.gn files without changing the location of generated file. Without
# this generated headers could cause issues when old headers aren't removed.
_gen_dir = target_gen_dir
if (defined(invoker.custom_gen_dir)) {
_gen_dir = invoker.custom_gen_dir
}
# For build parallelism GN wants to know the exact inputs and outputs of
# action targets like we use for our code generator. We avoid asking the
# generator about its inputs by using the "depfile" feature of GN/Ninja.
#
# A ninja limitation is that the depfile is a subset of Makefile that can
# contain a single target, so we output a single "JSON-tarball" instead.
_json_tarball = "${_gen_dir}/${target_name}.json_tarball"
_json_tarball_target = "${target_name}__json_tarball"
_json_tarball_depfile = "${_json_tarball}.d"
_generator_args += [
"--output-json-tarball",
rebase_path(_json_tarball, root_build_dir),
"--depfile",
rebase_path(_json_tarball_depfile, root_build_dir),
]
# After the JSON tarball is created we need an action target to extract it
# with a list of its outputs. The invoker provided a list of expected
# outputs. To make sure the list is in sync between the generator and the
# build files, we write it to a file and ask the generator to assert it is
# correct.
_expected_outputs_file = "${_gen_dir}/${target_name}.expected_outputs"
write_file(_expected_outputs_file, invoker.outputs)
_generator_args += [
"--expected-outputs-file",
rebase_path(_expected_outputs_file, root_build_dir),
]
# The code generator invocation that will write the JSON tarball, check the
# outputs are what's expected and write a depfile for Ninja.
action(_json_tarball_target) {
script = invoker.script
outputs = [ _json_tarball ]
depfile = _json_tarball_depfile
args = _generator_args
if (defined(invoker.deps)) {
deps = invoker.deps
}
}
# Extract the JSON tarball into the gen_dir
action(target_name) {
script = "${invoker.generator_lib_dir}/extract_json.py"
args = [
rebase_path(_json_tarball, root_build_dir),
rebase_path(_gen_dir, root_build_dir),
]
deps = [ ":${_json_tarball_target}" ]
inputs = [ _json_tarball ]
# The expected output list is relative to the gen_dir but action
# target outputs are from the root dir so we need to rebase them.
outputs = []
foreach(source, invoker.outputs) {
outputs += [ "${_gen_dir}/${source}" ]
}
}
}
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