1 # Copyright 2014 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.
5 # This provides the yasm_assemble() template which uses YASM to assemble
8 # Files to be assembled with YASM should have an extension of .asm.
12 # yasm_flags (optional)
13 # [list of strings] Pass additional flags into YASM. These are appended
14 # to the command line. Note that the target machine type and system is
15 # already set up based on the current toolchain so you don't need to
16 # specify these things (see below).
18 # Example: yasm_flags = [ "--force-strict" ]
20 # include_dirs (optional)
21 # [list of dir names] List of additional include dirs. Note that the
22 # source root and the root generated file dir is always added, just like
23 # our C++ build sets up.
25 # Example: include_dirs = [ "//some/other/path", target_gen_dir ]
28 # [list of strings] List of defines, as with the native code defines.
30 # Example: defines = [ "FOO", "BAR=1" ]
32 # inputs, deps, visibility (optional)
33 # These have the same meaning as in an action.
37 # yasm_assemble("my_yasm_target") {
39 # "ultra_optimized_awesome.asm",
41 # include_dirs = [ "assembly_include" ]
44 if (is_mac || is_ios) {
45 if (cpu_arch == "x86") {
50 } else if (cpu_arch == "x64") {
56 } else if (is_posix) {
57 if (cpu_arch == "x86") {
62 } else if (cpu_arch == "x64") {
70 if (cpu_arch == "x86") {
76 } else if (cpu_arch == "x64") {
84 # Default yasm include dirs. Make it match the native build (source root and
85 # root generated code directory).
87 # Using "//." will produce a relative path "../.." which looks better than
88 # "../../" which will result from using "//" as the base (although both
89 # work). This is because rebase_path will terminate the result in a slash if
90 # the input ends in a slash.
91 "-I" + rebase_path("//.", root_build_dir),
92 "-I" + rebase_path(root_gen_dir, root_build_dir),
96 asm_obj_extension = "obj"
98 asm_obj_extension = "o"
101 template("yasm_assemble") {
102 # TODO(ajwong): Support use_system_yasm.
103 assert(defined(invoker.sources), "Need sources defined for $target_name")
105 # Only depend on YASM on x86 systems. Force compilation of .asm files for
107 assert(cpu_arch == "x86" || cpu_arch == "x64")
109 action_name = "${target_name}_action"
110 source_set_name = target_name
112 action_foreach(action_name) {
113 # Only the source set can depend on this.
114 visibility = [ ":$source_set_name" ]
116 script = "//third_party/yasm/run_yasm.py"
117 sources = invoker.sources
119 if (defined(invoker.inputs)) {
120 inputs = invoker.inputs
123 # Executable (first in the args). The binary might be in the root build dir
124 # (no cross-compiling) or in a toolchain-specific subdirectory of that
125 # (when cross-compiling).
126 yasm_label = "//third_party/yasm($host_toolchain)"
127 args = [ "./" + # Force current dir.
128 rebase_path(get_label_info(yasm_label, "root_out_dir") + "/yasm",
133 deps = [ yasm_label ]
134 if (defined(invoker.deps)) {
140 if (defined(invoker.yasm_flags)) {
141 args += invoker.yasm_flags
144 # Extra include directories.
145 if (defined(invoker.include_dirs)) {
146 foreach(include, invoker.include_dirs) {
147 args += [ "-I" + rebase_path(include, root_build_dir) ]
152 if (defined(invoker.defines)) {
153 foreach(def, invoker.defines) {
160 # TODO(brettw) it might be nice if there was a source expansion for the
161 # path of the source file relative to the source root. Then we could
162 # exactly duplicate the naming and location of object files from the
163 # native build, which would be:
164 # "$root_out_dir/${target_name}.{{source_dir_part}}.$asm_obj_extension"
165 outputs = [ "$target_out_dir/{{source_name_part}}.o" ]
167 "-o", rebase_path(outputs[0], root_build_dir),
171 # The wrapper script run_yasm will write the depfile to the same name as
172 # the output but with .d appended (like gcc will).
173 depfile = outputs[0] + ".d"
176 # Gather the .o files into a linkable thing. This doesn't actually link
177 # anything (a source set just compiles files to link later), but will pass
178 # the object files generated by the action up the dependency chain.
179 source_set(source_set_name) {
180 if (defined(invoker.visibility)) {
181 visibility = invoker.visibility
184 sources = get_target_outputs(":$action_name")
186 deps = [ ":$action_name" ]