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1# Copyright 2015 The Chromium Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5assert(is_win, "This only runs on Windows.")
6
7# Runs mc.exe over a list of sources. The outputs (a header and rc file) are
8# placed in the target gen dir, and compiled.
9#
10# sources
11#   List of message files to process.
12#
13# user_mode_logging (optional bool)
14#   Generates user-mode logging code. Defaults to false (no logging code).
15#
16# compile_generated_code (optional, deafults = true)
17#   If unset or true, the generated code will be compiled and linked into
18#   targets that depend on it. If set to false, the .h and .rc files will only
19#   be generated.
20#
21# deps, public_deps, visibility
22#   Normal meaning.
23template("message_compiler") {
24  if (defined(invoker.compile_generated_code) &&
25      !invoker.compile_generated_code) {
26    compile_generated_code = false
27    action_name = target_name
28  } else {
29    compile_generated_code = true
30    action_name = "${target_name}_mc"
31    source_set_name = target_name
32  }
33
34  action_foreach(action_name) {
35    if (compile_generated_code) {
36      visibility = [ ":$source_set_name" ]
37    } else {
38      forward_variables_from(invoker, [ "visibility" ])
39    }
40
41    script = "//build/win/message_compiler.py"
42
43    outputs = [
44      "$target_gen_dir/{{source_name_part}}.h",
45      "$target_gen_dir/{{source_name_part}}.rc",
46    ]
47
48    args = [
49      # The first argument is the environment file saved to the build
50      # directory. This is required because the Windows toolchain setup saves
51      # the VC paths and such so that running "mc.exe" will work with the
52      # configured toolchain. This file is in the root build dir.
53      "environment.$current_cpu",
54
55      # Where to put the header.
56      "-h",
57      rebase_path(target_gen_dir, root_build_dir),
58
59      # Where to put the .rc file.
60      "-r",
61      rebase_path(target_gen_dir, root_build_dir),
62
63      # Input is Unicode.
64      "-u",
65    ]
66    if (defined(invoker.user_mode_logging) && invoker.user_mode_logging) {
67      args += [ "-um" ]
68    }
69    args += [ "{{source}}" ]
70
71    forward_variables_from(invoker,
72                           [
73                             "deps",
74                             "public_deps",
75                             "sources",
76                           ])
77  }
78
79  if (compile_generated_code) {
80    # Compile the generated rc file.
81    source_set(source_set_name) {
82      forward_variables_from(invoker, [ "visibility" ])
83      sources = get_target_outputs(":$action_name")
84      deps = [
85        ":$action_name",
86      ]
87    }
88  }
89}
90