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+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This provides the yasm_assemble() template which uses YASM to assemble
+# assembly files.
+#
+# Files to be assembled with YASM should have an extension of .asm.
+#
+# Parameters
+#
+# yasm_flags (optional)
+# [list of strings] Pass additional flags into YASM. These are appended
+# to the command line. Note that the target machine type and system is
+# already set up based on the current toolchain so you don't need to
+# specify these things (see below).
+#
+# Example: yasm_flags = [ "--force-strict" ]
+#
+# include_dirs (optional)
+# [list of dir names] List of additional include dirs. Note that the
+# source root and the root generated file dir is always added, just like
+# our C++ build sets up.
+#
+# Example: include_dirs = [ "//some/other/path", target_gen_dir ]
+#
+# defines (optional)
+# [list of strings] List of defines, as with the native code defines.
+#
+# Example: defines = [ "FOO", "BAR=1" ]
+#
+# inputs, deps, visibility (optional)
+# These have the same meaning as in an action.
+#
+# Example
+#
+# yasm_assemble("my_yasm_target") {
+# sources = [
+# "ultra_optimized_awesome.asm",
+# ]
+# include_dirs = [ "assembly_include" ]
+# }
+
+if (is_mac || is_ios) {
+ if (current_cpu == "x86") {
+ _yasm_flags = [
+ "-fmacho32",
+ "-m",
+ "x86",
+ ]
+ } else if (current_cpu == "x64") {
+ _yasm_flags = [
+ "-fmacho64",
+ "-m",
+ "amd64",
+ ]
+ }
+} else if (is_posix) {
+ if (current_cpu == "x86") {
+ _yasm_flags = [
+ "-felf32",
+ "-m",
+ "x86",
+ ]
+ } else if (current_cpu == "x64") {
+ _yasm_flags = [
+ "-DPIC",
+ "-felf64",
+ "-m",
+ "amd64",
+ ]
+ }
+} else if (is_win) {
+ if (current_cpu == "x86") {
+ _yasm_flags = [
+ "-DPREFIX",
+ "-fwin32",
+ "-m",
+ "x86",
+ ]
+ } else if (current_cpu == "x64") {
+ _yasm_flags = [
+ "-fwin64",
+ "-m",
+ "amd64",
+ ]
+ }
+}
+
+if (is_win) {
+ asm_obj_extension = "obj"
+} else {
+ asm_obj_extension = "o"
+}
+
+template("yasm_assemble") {
+ assert(defined(invoker.sources), "Need sources defined for $target_name")
+
+ # Only depend on YASM on x86 systems. Force compilation of .asm files for
+ # ARM to fail.
+ assert(current_cpu == "x86" || current_cpu == "x64")
+
+ action_name = "${target_name}_action"
+ source_set_name = target_name
+
+ action_foreach(action_name) {
+ # Only the source set can depend on this.
+ visibility = [ ":$source_set_name" ]
+
+ script = "//third_party/yasm/run_yasm.py"
+ sources = invoker.sources
+
+ if (defined(invoker.inputs)) {
+ inputs = invoker.inputs
+ }
+
+ # Executable (first in the args). The binary might be in the root build dir
+ # (no cross-compiling) or in a toolchain-specific subdirectory of that
+ # (when cross-compiling).
+ yasm_label = "//third_party/yasm($host_toolchain)"
+ args = [ "./" + # Force current dir.
+ rebase_path(get_label_info(yasm_label, "root_out_dir") + "/yasm",
+ root_build_dir) ]
+
+ # Deps.
+ deps = [
+ yasm_label,
+ ]
+ if (defined(invoker.deps)) {
+ deps += invoker.deps
+ }
+
+ # Flags.
+ args += _yasm_flags
+ if (defined(invoker.yasm_flags)) {
+ args += invoker.yasm_flags
+ }
+
+ # User defined include dirs go first.
+ if (defined(invoker.include_dirs)) {
+ foreach(include, invoker.include_dirs) {
+ args += [ "-I" + rebase_path(include, root_build_dir) ]
+ }
+ }
+
+ # Default yasm include dirs. Make it match the native build (source root and
+ # root generated code directory).
+ # This goes to the end of include list.
+ args += [
+ "-I.",
+
+ # Using "//." will produce a relative path "../.." which looks better than
+ # "../../" which will result from using "//" as the base (although both
+ # work). This is because rebase_path will terminate the result in a
+ # slash if the input ends in a slash.
+ "-I" + rebase_path("//.", root_build_dir),
+ "-I" + rebase_path(root_gen_dir, root_build_dir),
+ ]
+
+ # Extra defines.
+ if (defined(invoker.defines)) {
+ foreach(def, invoker.defines) {
+ args += [ "-D$def" ]
+ }
+ }
+
+ # Output file.
+ outputs = [
+ "$target_out_dir/$source_set_name/{{source_name_part}}.o",
+ ]
+ args += [
+ "-o",
+ rebase_path(outputs[0], root_build_dir),
+ "{{source}}",
+ ]
+
+ # The wrapper script run_yasm will write the depfile to the same name as
+ # the output but with .d appended (like gcc will).
+ depfile = outputs[0] + ".d"
+ }
+
+ # Gather the .o files into a linkable thing. This doesn't actually link
+ # anything (a source set just compiles files to link later), but will pass
+ # the object files generated by the action up the dependency chain.
+ static_library(source_set_name) {
+ if (defined(invoker.visibility)) {
+ visibility = invoker.visibility
+ }
+
+ sources = get_target_outputs(":$action_name")
+
+ deps = [
+ ":$action_name",
+ ]
+ }
+}