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115 lines
3.4 KiB
Plaintext
115 lines
3.4 KiB
Plaintext
# Copyright (C) 2018 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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wasm_toolchain = "//gn/standalone/toolchain:wasm"
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is_wasm = current_toolchain == wasm_toolchain
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emsdk_dir = rebase_path("//buildtools/emsdk", "")
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nodejs_dir = rebase_path("//buildtools/nodejs", "")
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# This variable is used by the //gn/standalone/toolchain/BUILD.gn.
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em_config = "EMSCRIPTEN_ROOT='$emsdk_dir/emscripten';"
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em_config += "LLVM_ROOT='$emsdk_dir/llvm';"
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em_config += "BINARYEN_ROOT='$emsdk_dir/llvm/binaryen';"
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em_config += "EMSCRIPTEN_NATIVE_OPTIMIZER='$emsdk_dir/llvm/optimizer';"
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em_config += "NODE_JS='$nodejs_dir/bin/node';"
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em_config += "COMPILER_ENGINE=NODE_JS;"
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em_config += "JS_ENGINES=[NODE_JS];"
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em_config = "\"$em_config\""
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# Defines a WASM library target.
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# Args:
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# generate_js: when true generates a .wasm file and a .js file that wraps it
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# and provides the boilerplate to initialize the module.
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# generate_html: when true generates also an example .html file which contains
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# a minimal console to interact with the module (useful for testing).
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template("wasm_lib") {
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_lib_name = target_name
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if (is_wasm) {
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assert(defined(invoker.sources))
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_target_ldflags = [
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"-s",
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"WASM=1",
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"-s",
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"NO_FILESYSTEM=1",
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"-s",
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"DISABLE_EXCEPTION_CATCHING=1",
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"-s",
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"TOTAL_MEMORY=33554432",
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"-s",
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"RESERVED_FUNCTION_POINTERS=32",
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"-s",
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"BINARYEN_METHOD='native-wasm'",
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"-s",
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"EXPORT_FUNCTION_TABLES=1",
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"-s",
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"EXTRA_EXPORTED_RUNTIME_METHODS=['ccall', 'cwrap', 'addFunction']",
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]
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if (!is_debug) {
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_target_ldflags += [ "-O3" ]
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}
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if (defined(invoker.js_library)) {
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_target_ldflags += [
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"--js-library",
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invoker.js_library,
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]
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}
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_vars_to_forward = [
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"cflags",
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"defines",
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"deps",
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"includes",
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"sources",
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"include_dirs",
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"public_configs",
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"testonly",
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"visibility",
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]
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executable("${_lib_name}.js") {
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forward_variables_from(invoker, _vars_to_forward)
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ldflags = _target_ldflags
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output_extension = ""
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}
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# This is just a workaround to deal with the fact that GN doesn't allow
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# spcifying extra outputs for an executable() target. In reality the .wasm
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# file here is generated by the executable() target above, together with the
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# .js file. This dummy target is here to tell GN "there is a target that
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# outputs also the .wasm file", so we can depend on that in copy() targets.
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action("${_lib_name}.wasm") {
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inputs = []
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deps = [
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":${_lib_name}.js",
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]
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outputs = [
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"$root_out_dir/$_lib_name.wasm",
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]
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args = [ "--noop" ]
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script = "//gn/standalone/build_tool_wrapper.py"
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}
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} else { # is_wasm
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not_needed(invoker, "*")
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}
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group(target_name) {
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deps = [
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":${_lib_name}.js($wasm_toolchain)",
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":${_lib_name}.wasm($wasm_toolchain)",
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]
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}
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} # template
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