171 строка
5.9 KiB
Plaintext
171 строка
5.9 KiB
Plaintext
# Copyright 2014 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# This file introduces two related templates that act like action and
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# action_foreach but instead of running a Python script, it will compile a
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# given tool in the host toolchain and run that (either once or over the list
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# of inputs, depending on the variant).
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#
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# Parameters
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#
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# tool (required)
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# [label] Label of the tool to run. This should be an executable, and
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# this label should not include a toolchain (anything in parens). The
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# host compile of this tool will be used.
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#
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# outputs (required)
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# [list of files] Like the outputs of action (if using "compiled_action",
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# this would be just the list of outputs), or action_foreach (if using
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# "compiled_action_foreach", this would contain source expansions mapping
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# input to output files).
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#
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# args (required)
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# [list of strings] Same meaning as action/action_foreach.
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#
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# inputs (optional)
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# Files the binary takes as input. The step will be re-run whenever any
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# of these change. If inputs is empty, the step will run only when the
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# binary itself changes.
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#
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# visibility
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# deps
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# args (all optional)
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# Same meaning as action/action_foreach.
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#
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#
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# Example of usage:
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#
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# compiled_action("run_my_tool") {
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# tool = "//tools/something:mytool"
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# outputs = [
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# "$target_gen_dir/mysource.cc",
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# "$target_gen_dir/mysource.h",
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# ]
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#
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# # The tool takes this input.
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# inputs = [ "my_input_file.idl" ]
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#
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# # In this case, the tool takes as arguments the input file and the output
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# # build dir (both relative to the "cd" that the script will be run in)
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# # and will produce the output files listed above.
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# args = [
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# rebase_path("my_input_file.idl", root_build_dir),
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# "--output-dir", rebase_path(target_gen_dir, root_build_dir),
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# ]
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# }
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#
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# You would typically declare your tool like this:
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# if (host_toolchain == current_toolchain) {
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# executable("mytool") {
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# ...
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# }
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# }
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# The if statement around the executable is optional. That says "I only care
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# about this target in the host toolchain". Usually this is what you want, and
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# saves unnecessarily compiling your tool for the target platform. But if you
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# need a target build of your tool as well, just leave off the if statement.
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if (host_os == "win") {
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_host_executable_suffix = ".exe"
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} else {
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_host_executable_suffix = ""
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}
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template("compiled_action") {
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assert(defined(invoker.tool), "tool must be defined for $target_name")
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assert(defined(invoker.outputs), "outputs must be defined for $target_name")
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assert(defined(invoker.args), "args must be defined for $target_name")
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assert(!defined(invoker.sources),
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"compiled_action doesn't take a sources arg. Use inputs instead.")
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action(target_name) {
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forward_variables_from(invoker,
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[
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"deps",
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"inputs",
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"outputs",
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"testonly",
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"visibility",
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])
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if (!defined(deps)) {
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deps = []
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}
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if (!defined(inputs)) {
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inputs = []
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}
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script = "//build/gn_run_binary.py"
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# Constuct the host toolchain version of the tool.
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host_tool = invoker.tool + "($host_toolchain)"
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# Get the path to the executable. Currently, this assumes that the tool
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# does not specify output_name so that the target name is the name to use.
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# If that's not the case, we'll need another argument to the script to
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# specify this, since we can't know what the output name is (it might be in
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# another file not processed yet).
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host_executable =
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get_label_info(host_tool, "root_out_dir") + "/" +
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get_label_info(host_tool, "name") + _host_executable_suffix
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# Add the executable itself as an input.
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inputs += [ host_executable ]
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deps += [ host_tool ]
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# The script takes as arguments the binary to run, and then the arguments
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# to pass it.
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args = [ rebase_path(host_executable, root_build_dir) ] + invoker.args
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}
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}
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template("compiled_action_foreach") {
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assert(defined(invoker.sources), "sources must be defined for $target_name")
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assert(defined(invoker.tool), "tool must be defined for $target_name")
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assert(defined(invoker.outputs), "outputs must be defined for $target_name")
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assert(defined(invoker.args), "args must be defined for $target_name")
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action_foreach(target_name) {
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forward_variables_from(invoker,
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[
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"deps",
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"inputs",
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"outputs",
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"sources",
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"testonly",
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"visibility",
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])
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if (!defined(deps)) {
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deps = []
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}
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if (!defined(inputs)) {
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inputs = []
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}
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script = "//build/gn_run_binary.py"
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# Constuct the host toolchain version of the tool.
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host_tool = invoker.tool + "($host_toolchain)"
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# Get the path to the executable. Currently, this assumes that the tool
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# does not specify output_name so that the target name is the name to use.
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# If that's not the case, we'll need another argument to the script to
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# specify this, since we can't know what the output name is (it might be in
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# another file not processed yet).
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host_executable =
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get_label_info(host_tool, "root_out_dir") + "/" +
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get_label_info(host_tool, "name") + _host_executable_suffix
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# Add the executable itself as an input.
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inputs += [ host_executable ]
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deps += [ host_tool ]
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# The script takes as arguments the binary to run, and then the arguments
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# to pass it.
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args = [ rebase_path(host_executable, root_build_dir) ] + invoker.args
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}
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}
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