Add WebAssembly port of N-API

deps/v8/src/api/api-wasm.cc

@@ -70,8 +70,7 @@ Context::~Context() {
 Val::Val(ValKind kind, value value) : kind_(kind), value_(value) {}
 
 Val::Val() : kind_(ANYREF) { value_.ref = nullptr; }
-Val::Val(Val&& val) : Val(val.kind_, val.value_) {
-}
+Val::Val(Val&& val) : Val(val.kind_, val.value_) {}
 
 Val::Val(int32_t i) : kind_(I32) { value_.i32 = i; }
 Val::Val(int64_t i) : kind_(I64) { value_.i64 = i; }
@@ -170,7 +169,7 @@ i::Address FuncData::v8_callback(
 ) {
   FuncData* self = reinterpret_cast<FuncData*>(data);
   i::Isolate* isolate = self->isolate;
-  HandleScope scope(reinterpret_cast<v8::Isolate*>(isolate));
+  i::HandleScope scope(isolate);
 
   int num_param_types = self->param_count;
   int num_result_types = self->result_count;
@@ -203,9 +202,7 @@ i::Address FuncData::v8_callback(
         if (raw == i::kNullAddress) {
           params[i] = Val(nullptr);
         } else {
-          i::JSReceiver raw_obj = i::JSReceiver::cast(i::Object(raw));
-          i::Handle<i::JSReceiver> obj(raw_obj, raw_obj.GetIsolate());
-          params[i] = Val(reinterpret_cast<void*>(obj->address()));
+          params[i] = Val(reinterpret_cast<void*>(raw));
         }
         break;
       }

node.gyp

@@ -580,6 +580,8 @@
         'src/udp_wrap.cc',
         'src/util.cc',
         'src/uv.cc',
+        # wasm napi sources
+        'wasm_node_api/wasm_node_api.cc',
         # headers to make for a more pleasant IDE experience
         'src/aliased_buffer.h',
         'src/async_wrap.h',

src/node.cc

@@ -38,6 +38,13 @@
 #include "node_v8_platform-inl.h"
 #include "node_version.h"
 
+// TODO(ohadrau): Move this to a configure flag
+#define WASM_BUILTIN_NODE_API 1
+
+#if WASM_BUILTIN_NODE_API
+#include "../wasm_node_api/wasm_node_api.h"
+#endif
+
 #if HAVE_OPENSSL
 #include "node_crypto.h"
 #endif
@@ -421,6 +428,11 @@ MaybeLocal<Value> StartMainThreadExecution(Environment* env) {
   // To allow people to extend Node in different ways, this hook allows
   // one to drop a file lib/_third_party_main.js into the build
   // directory which will be executed instead of Node's normal loading.
+#if WASM_BUILTIN_NODE_API
+  v8::Isolate* isolate = env->isolate();
+  wasm_napi::RegisterNapiBuiltins(isolate);
+#endif
+
   if (NativeModuleEnv::Exists("_third_party_main")) {
     return StartExecution(env, "internal/main/run_third_party_main");
   }

test_wasm/Makefile

@@ -0,0 +1,27 @@
+SYSROOT=$$HOME/Projects/wasi-sysroot/sysroot
+TARGET=wasm32-wasi
+
+COMMA=,
+
+SOURCES=test_napi.c ../wasm_node_api/wasm_napi_lib/node_api_overrides.c
+
+OBJECTS=$(SOURCES:.c=.o)
+
+IMPORTS=$(shell cat import.syms)
+EXPORTS=$(shell cat export.syms)
+
+CFLAGS=-I../wasm_node_api/wasm_napi_lib --sysroot=$(SYSROOT) --target=$(TARGET)
+IMPORTFLAGS=-allow-undefined-file import.syms
+EXPORTFLAGS=$(addprefix --export=, $(EXPORTS)) --export-table
+LDFLAGS=--entry=main $(IMPORTFLAGS) $(EXPORTFLAGS) -L$(SYSROOT)/lib/wasm32-wasi -lc
+
+all: test_wasm_napi.node.wasm
+
+clean:
+	rm -f $(OBJECTS) test-napi.wasm
+
+test_wasm_napi.wasm: $(OBJECTS)
+	wasm-ld $(LDFLAGS) -o $@ $^
+
+%.o: %.c
+	clang $(CFLAGS) -o $@ -c $<

test_wasm/export.syms

@@ -0,0 +1,2 @@
+main
+Init

test_wasm/import.syms

@@ -0,0 +1,30 @@
+napi_create_string_utf8
+create_napi_module
+set_napi_module_nm_version
+set_napi_module_nm_flags
+set_napi_module_nm_filename
+set_napi_module_nm_register_func
+set_napi_module_nm_modname
+set_napi_module_nm_priv
+_napi_module_register
+napi_create_external_arraybuffer
+napi_create_external_buffer
+create_property_descriptors
+set_napi_property_descriptor_utf8name
+set_napi_property_descriptor_name
+set_napi_property_descriptor_method
+set_napi_property_descriptor_getter
+set_napi_property_descriptor_setter
+set_napi_property_descriptor_value
+set_napi_property_descriptor_attributes
+set_napi_property_descriptor_data
+_napi_define_properties
+_napi_define_class
+get_string_length
+copy_string_to_wasm
+create_napi_extended_error_info
+_napi_get_last_error_info
+napi_extended_error_info_engine_error_code
+napi_extended_error_info_engine_reserved
+napi_extended_error_info_error_code
+napi_extended_error_info_error_message

test_wasm/test_napi.c

@@ -0,0 +1,40 @@
+#include <assert.h>
+#include <node_api.h>
+
+typedef opaque_ptr napi_env;
+typedef opaque_ptr napi_callback_info;
+typedef opaque_ptr napi_value;
+
+napi_value Hello(napi_env env, napi_callback_info info) {
+  napi_status status;
+  napi_value world;
+  status = napi_create_string_utf8(env, "world", 5, &world);
+  assert(status == napi_ok);
+  return world;
+}
+
+#define DECLARE_NAPI_METHOD(name, func) \
+  { name, 0, func, 0, 0, 0, napi_default, 0 }
+
+napi_value Init(napi_env env, napi_value exports) {
+  napi_status status;
+  napi_property_descriptor desc = DECLARE_NAPI_METHOD("hello", Hello);
+  status = napi_define_properties(env, exports, 1, &desc);
+  assert(status == napi_ok);
+  return exports;
+}
+
+napi_module mod = {
+  NAPI_MODULE_VERSION,
+  0,
+  __FILE__,
+  Init,
+  "test_wasm_napi",
+  NULL,
+  {0}
+};
+
+int main(int argc, char **argv) {
+  napi_module_register(&mod);
+  return 0;
+}