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# Copyright 2018 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# This provides the nasm_assemble() template which uses NASM to assemble
# assembly files.
#
# Files to be assembled with NASM should have an extension of .asm.
#
# Parameters
#
# nasm_flags (optional)
# [list of strings] Pass additional flags into NASM. These are appended
# to the command line. Note that the output format is already set up
# based on the current toolchain so you don't need to specify these
# things (see below).
#
# Example: nasm_flags = [ "-Wall" ]
#
# 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
#
# nasm_assemble("my_nasm_target") {
# sources = [
# "ultra_optimized_awesome.asm",
# ]
# include_dirs = [ "assembly_include" ]
# }
import("//build/compiled_action.gni")
import("//build/config/ios/config.gni")
import("//build/config/ios/ios_sdk_overrides.gni")
if (is_mac) {
import("//build/config/mac/mac_sdk.gni")
}
if ((is_mac || is_ios) && (current_cpu == "x86" || current_cpu == "x64")) {
if (current_cpu == "x86") {
_nasm_flags = [ "-fmacho32" ]
} else if (current_cpu == "x64") {
_nasm_flags = [ "-fmacho64" ]
}
if (is_mac) {
_nasm_flags += [ "--macho-min-os=macos$mac_deployment_target" ]
} else if (is_ios) {
if (target_environment == "device") {
_nasm_flags += [ "--macho-min-os=ios$ios_deployment_target" ]
} else {
_nasm_flags +=
[ "--macho-min-os=ios$ios_deployment_target-$target_environment" ]
}
}
} else if (is_posix || is_fuchsia) {
if (current_cpu == "x86") {
_nasm_flags = [ "-felf32" ]
} else if (current_cpu == "x64") {
_nasm_flags = [
"-DPIC",
"-felf64",
]
}
} else if (is_win) {
if (current_cpu == "x86") {
_nasm_flags = [
"-DPREFIX",
"-fwin32",
]
} else if (current_cpu == "x64") {
_nasm_flags = [ "-fwin64" ]
}
}
if (is_win) {
asm_obj_extension = "obj"
} else {
asm_obj_extension = "o"
}
template("nasm_assemble") {
assert(defined(invoker.sources), "Need sources defined for $target_name")
# Only depend on NASM on x86 systems. Force compilation of .asm files for
# ARM to fail.
assert(current_cpu == "x86" || current_cpu == "x64")
action_name = "${target_name}_action"
source_set_name = target_name
compiled_action_foreach(action_name) {
# Only the source set can depend on this.
visibility = [ ":$source_set_name" ]
tool = "//third_party/nasm"
forward_variables_from(invoker,
[
"sources",
"inputs",
"deps",
])
# Flags.
args = _nasm_flags
if (defined(invoker.nasm_flags)) {
args += invoker.nasm_flags
}
# Avoids writing time-of-compile timestamps into built objects.
args += [ "--reproducible" ]
# User defined include dirs go first.
if (defined(invoker.include_dirs)) {
foreach(include, invoker.include_dirs) {
# NASM does not append path separators when processing the -I flags, so
# -Ifoo means includes of bar look up "foobar" rather than "foo/bar".
# Add the trailing slash for it.
args += [ "-I" + rebase_path(include, root_build_dir) + "/" ]
}
}
# Default nasm include dirs. Make it match the native build (source root and
# root generated code directory).
# This goes to the end of include list. Note that, as above, we must append
# path separators because NASM does not do it itself.
args += [
"-I./",
# rebase_path("//") already includes a trailing slash.
"-I" + rebase_path("//", root_build_dir),
"-I" + rebase_path(root_gen_dir, root_build_dir) + "/",
]
# Extra defines.
if (defined(invoker.defines)) {
foreach(def, invoker.defines) {
args += [ "-D$def" ]
}
}
# Output file.
outputs = [ "$target_out_dir/$source_set_name/{{source_name_part}}.o" ]
args += [
"-MD",
rebase_path(outputs[0] + ".d", root_build_dir),
"-o",
rebase_path(outputs[0], root_build_dir),
"{{source}}",
]
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
}
if (defined(invoker.all_dependent_configs)) {
all_dependent_configs = invoker.all_dependent_configs
}
sources = get_target_outputs(":$action_name")
# Do not publicize any header to remove build dependency.
public = []
deps = [ ":$action_name" ]
}
}
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