151 lines
4.4 KiB
Plaintext
151 lines
4.4 KiB
Plaintext
# Copyright (C) 2018 The Android Open Source Project
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
import("../wasm_vars.gni")
|
|
|
|
# Used by //gn/standalone/toolchain/BUILD.gn .
|
|
em_config = rebase_path(".emscripten", "")
|
|
if (is_mac_host) {
|
|
emsdk_dir = rebase_path("//buildtools/mac/emsdk", "")
|
|
} else {
|
|
emsdk_dir = rebase_path("//buildtools/linux64/emsdk", "")
|
|
}
|
|
|
|
# Defines a WASM library target.
|
|
# Args:
|
|
# generate_js: when true generates a .wasm file and a .js file that wraps it
|
|
# and provides the boilerplate to initialize the module.
|
|
# generate_html: when true generates also an example .html file which contains
|
|
# a minimal console to interact with the module (useful for testing).
|
|
template("wasm_lib") {
|
|
assert(defined(invoker.name))
|
|
|
|
# If the name is foo the target_name must be foo_wasm.
|
|
assert(invoker.name + "_wasm" == target_name)
|
|
_lib_name = invoker.name
|
|
if (is_wasm) {
|
|
_exports = "['ccall', 'callMain', 'addFunction', 'FS']"
|
|
_target_ldflags = [
|
|
"-s",
|
|
"WASM=1",
|
|
"-s",
|
|
"DISABLE_EXCEPTION_CATCHING=1",
|
|
"-s",
|
|
"NO_DYNAMIC_EXECUTION=1",
|
|
"-s",
|
|
"INITIAL_MEMORY=33554432",
|
|
"-s",
|
|
"ALLOW_MEMORY_GROWTH=1",
|
|
"-s",
|
|
"ALLOW_TABLE_GROWTH=1",
|
|
"-s",
|
|
"WASM_ASYNC_COMPILATION=0",
|
|
"-s",
|
|
"EXTRA_EXPORTED_RUNTIME_METHODS=" + _exports,
|
|
|
|
# This forces the MEMFS filesystem library to always use typed arrays
|
|
# instead of building strings/arrays when appending to a file. This allows
|
|
# to deal with pseudo-files larger than 128 MB when calling trace_to_text.
|
|
"-s",
|
|
"MEMFS_APPEND_TO_TYPED_ARRAYS=1",
|
|
|
|
# Reduces global namespace pollution.
|
|
"-s",
|
|
"MODULARIZE=1",
|
|
|
|
# This is to prevent that two different wasm modules end up generating
|
|
# JS that overrides the same global variable (var Module = ...)
|
|
"-s",
|
|
"EXPORT_NAME=${target_name}",
|
|
|
|
"-lworkerfs.js", # For FS.filesystems.WORKERFS
|
|
]
|
|
if (is_debug) {
|
|
_target_ldflags += [
|
|
"-s",
|
|
"ASSERTIONS=2",
|
|
"-s",
|
|
"SAFE_HEAP=1",
|
|
"-s",
|
|
"STACK_OVERFLOW_CHECK=1",
|
|
"-g4",
|
|
"-O0",
|
|
]
|
|
} else {
|
|
_target_ldflags += [
|
|
"-s",
|
|
"ASSERTIONS=1",
|
|
"-g2", # Required for getting C++ symbol names.
|
|
"-O3",
|
|
]
|
|
}
|
|
|
|
if (defined(invoker.js_library)) {
|
|
_target_ldflags += [
|
|
"--js-library",
|
|
invoker.js_library,
|
|
]
|
|
}
|
|
|
|
_vars_to_forward = [
|
|
"cflags",
|
|
"defines",
|
|
"deps",
|
|
"includes",
|
|
"sources",
|
|
"include_dirs",
|
|
"public_configs",
|
|
"testonly",
|
|
"visibility",
|
|
]
|
|
|
|
executable("${_lib_name}.js") {
|
|
forward_variables_from(invoker, _vars_to_forward)
|
|
ldflags = _target_ldflags
|
|
output_extension = ""
|
|
}
|
|
|
|
# This is just a workaround to deal with the fact that GN doesn't allow
|
|
# spcifying extra outputs for an executable() target. In reality the .wasm
|
|
# file here is generated by the executable() target above, together with the
|
|
# .js file. This dummy target is here to tell GN "there is a target that
|
|
# outputs also the .wasm file", so we can depend on that in copy() targets.
|
|
action("${_lib_name}.wasm") {
|
|
inputs = []
|
|
deps = [ ":${_lib_name}.js" ]
|
|
outputs = [ "$root_out_dir/$_lib_name.wasm" ]
|
|
if (is_debug) {
|
|
outputs += [ "$root_out_dir/$_lib_name.wasm.map" ]
|
|
}
|
|
args = [ "--noop" ]
|
|
script = "//gn/standalone/build_tool_wrapper.py"
|
|
}
|
|
|
|
copy("${_lib_name}.d.ts") {
|
|
sources = [ "//gn/standalone/wasm_typescript_declaration.d.ts" ]
|
|
outputs = [ "$root_out_dir/$_lib_name.d.ts" ]
|
|
}
|
|
} else { # is_wasm
|
|
not_needed(invoker, "*")
|
|
}
|
|
|
|
group(target_name) {
|
|
deps = [
|
|
":${_lib_name}.d.ts($wasm_toolchain)",
|
|
":${_lib_name}.js($wasm_toolchain)",
|
|
":${_lib_name}.wasm($wasm_toolchain)",
|
|
]
|
|
}
|
|
} # template
|