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# 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")
emsdk_dir = rebase_path("//buildtools/emsdk", "")
nodejs_dir = rebase_path("//buildtools/nodejs", "")
# This variable is used by the //gn/standalone/toolchain/BUILD.gn.
em_config = "EMSCRIPTEN_ROOT='$emsdk_dir/emscripten';"
em_config += "LLVM_ROOT='$emsdk_dir/llvm';"
em_config += "BINARYEN_ROOT='$emsdk_dir/llvm/binaryen';"
em_config += "EMSCRIPTEN_NATIVE_OPTIMIZER='$emsdk_dir/llvm/optimizer';"
em_config += "NODE_JS='$nodejs_dir/bin/node';"
em_config += "COMPILER_ENGINE=NODE_JS;"
em_config += "JS_ENGINES=[NODE_JS];"
em_config = "\"$em_config\""
# 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) {
_target_ldflags = [
"-s",
"WASM=1",
"-s",
"DISABLE_EXCEPTION_CATCHING=1",
"-s",
"NO_DYNAMIC_EXECUTION=1",
"-s",
"TOTAL_MEMORY=33554432",
"-s",
"ALLOW_MEMORY_GROWTH=1",
"-s",
"RESERVED_FUNCTION_POINTERS=32",
"-s",
"BINARYEN_METHOD='native-wasm'",
"-s",
"BINARYEN_TRAP_MODE='clamp'",
"-s",
"EXPORT_FUNCTION_TABLES=1",
"-s",
"EXTRA_EXPORTED_RUNTIME_METHODS=['ccall', 'cwrap', 'addFunction', 'FS']",
# 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=${target_name}",
]
if (is_debug) {
_target_ldflags += [ "-g4" ]
} else {
_target_ldflags += [ "-O3" ]
}
if (defined(invoker.js_library)) {
_target_ldflags += [
"--js-library",
invoker.js_library,
]
}
_vars_to_forward = [
"cflags",
"defines",
"deps",
"includes",
"sources",
"include_dirs",
"public_configs",
"testonly",
"visibility",
]
executable("${_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
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