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| 1 | +#include "node_wasm_web_api.h" |
| 2 | + |
| 3 | +#include "memory_tracker-inl.h" |
| 4 | +#include "node_errors.h" |
| 5 | + |
| 6 | +namespace node { |
| 7 | +namespace wasm_web_api { |
| 8 | + |
| 9 | +using v8::ArrayBuffer; |
| 10 | +using v8::ArrayBufferView; |
| 11 | +using v8::Context; |
| 12 | +using v8::Function; |
| 13 | +using v8::FunctionCallbackInfo; |
| 14 | +using v8::FunctionTemplate; |
| 15 | +using v8::Local; |
| 16 | +using v8::MaybeLocal; |
| 17 | +using v8::Object; |
| 18 | +using v8::Value; |
| 19 | +using v8::WasmStreaming; |
| 20 | + |
| 21 | +Local<Function> WasmStreamingObject::Initialize(Environment* env) { |
| 22 | + Local<Function> templ = env->wasm_streaming_object_constructor(); |
| 23 | + if (!templ.IsEmpty()) { |
| 24 | + return templ; |
| 25 | + } |
| 26 | + |
| 27 | + Local<FunctionTemplate> t = env->NewFunctionTemplate(New); |
| 28 | + t->Inherit(BaseObject::GetConstructorTemplate(env)); |
| 29 | + t->InstanceTemplate()->SetInternalFieldCount( |
| 30 | + WasmStreamingObject::kInternalFieldCount); |
| 31 | + |
| 32 | + env->SetProtoMethod(t, "push", Push); |
| 33 | + env->SetProtoMethod(t, "finish", Finish); |
| 34 | + env->SetProtoMethod(t, "abort", Abort); |
| 35 | + |
| 36 | + auto function = t->GetFunction(env->context()).ToLocalChecked(); |
| 37 | + env->set_wasm_streaming_object_constructor(function); |
| 38 | + return function; |
| 39 | +} |
| 40 | + |
| 41 | +void WasmStreamingObject::RegisterExternalReferences( |
| 42 | + ExternalReferenceRegistry* registry) { |
| 43 | + registry->Register(Push); |
| 44 | + registry->Register(Finish); |
| 45 | + registry->Register(Abort); |
| 46 | +} |
| 47 | + |
| 48 | +void WasmStreamingObject::MemoryInfo(MemoryTracker* tracker) const { |
| 49 | + // v8::WasmStreaming is opaque. We assume that the size of the WebAssembly |
| 50 | + // module that is being compiled is roughly what V8 allocates (as in, off by |
| 51 | + // only a small factor). |
| 52 | + tracker->TrackFieldWithSize("streaming", wasm_size_); |
| 53 | +} |
| 54 | + |
| 55 | +MaybeLocal<Object> WasmStreamingObject::Create( |
| 56 | + Environment* env, std::shared_ptr<WasmStreaming> streaming) { |
| 57 | + Local<Function> ctor = Initialize(env); |
| 58 | + Local<Object> obj; |
| 59 | + if (!ctor->NewInstance(env->context(), 0, nullptr).ToLocal(&obj)) { |
| 60 | + return MaybeLocal<Object>(); |
| 61 | + } |
| 62 | + |
| 63 | + CHECK(streaming); |
| 64 | + |
| 65 | + WasmStreamingObject* ptr = Unwrap<WasmStreamingObject>(obj); |
| 66 | + CHECK_NOT_NULL(ptr); |
| 67 | + ptr->streaming_ = streaming; |
| 68 | + ptr->wasm_size_ = 0; |
| 69 | + return obj; |
| 70 | +} |
| 71 | + |
| 72 | +void WasmStreamingObject::New(const FunctionCallbackInfo<Value>& args) { |
| 73 | + CHECK(args.IsConstructCall()); |
| 74 | + Environment* env = Environment::GetCurrent(args); |
| 75 | + new WasmStreamingObject(env, args.This()); |
| 76 | +} |
| 77 | + |
| 78 | +void WasmStreamingObject::Push(const FunctionCallbackInfo<Value>& args) { |
| 79 | + WasmStreamingObject* obj; |
| 80 | + ASSIGN_OR_RETURN_UNWRAP(&obj, args.Holder()); |
| 81 | + CHECK(obj->streaming_); |
| 82 | + |
| 83 | + CHECK_EQ(args.Length(), 1); |
| 84 | + Local<Value> chunk = args[0]; |
| 85 | + |
| 86 | + // The start of the memory section backing the ArrayBuffer(View), the offset |
| 87 | + // of the ArrayBuffer(View) within the memory section, and its size in bytes. |
| 88 | + const void* bytes; |
| 89 | + size_t offset; |
| 90 | + size_t size; |
| 91 | + |
| 92 | + if (LIKELY(chunk->IsArrayBufferView())) { |
| 93 | + Local<ArrayBufferView> view = chunk. As<ArrayBufferView>(); |
| 94 | + bytes = view->Buffer()->GetBackingStore()->Data(); |
| 95 | + offset = view->ByteOffset(); |
| 96 | + size = view->ByteLength(); |
| 97 | + } else if (LIKELY(chunk->IsArrayBuffer())) { |
| 98 | + Local<ArrayBuffer> buffer = chunk. As<ArrayBuffer>(); |
| 99 | + bytes = buffer->GetBackingStore()->Data(); |
| 100 | + offset = 0; |
| 101 | + size = buffer->ByteLength(); |
| 102 | + } else { |
| 103 | + return node::THROW_ERR_INVALID_ARG_TYPE( |
| 104 | + Environment::GetCurrent(args), |
| 105 | + "chunk must be an ArrayBufferView or an ArrayBuffer"); |
| 106 | + } |
| 107 | + |
| 108 | + // Forward the data to V8. Internally, V8 will make a copy. |
| 109 | + obj->streaming_->OnBytesReceived(static_cast<const uint8_t*>(bytes) + offset, |
| 110 | + size); |
| 111 | + obj->wasm_size_ += size; |
| 112 | +} |
| 113 | + |
| 114 | +void WasmStreamingObject::Finish(const FunctionCallbackInfo<Value>& args) { |
| 115 | + WasmStreamingObject* obj; |
| 116 | + ASSIGN_OR_RETURN_UNWRAP(&obj, args.Holder()); |
| 117 | + CHECK(obj->streaming_); |
| 118 | + |
| 119 | + CHECK_EQ(args.Length(), 0); |
| 120 | + obj->streaming_->Finish(); |
| 121 | +} |
| 122 | + |
| 123 | +void WasmStreamingObject::Abort(const FunctionCallbackInfo<Value>& args) { |
| 124 | + WasmStreamingObject* obj; |
| 125 | + ASSIGN_OR_RETURN_UNWRAP(&obj, args.Holder()); |
| 126 | + CHECK(obj->streaming_); |
| 127 | + |
| 128 | + CHECK_EQ(args.Length(), 1); |
| 129 | + obj->streaming_->Abort(args[0]); |
| 130 | +} |
| 131 | + |
| 132 | +void StartStreamingCompilation(const FunctionCallbackInfo<Value>& info) { |
| 133 | + // V8 passes an instance of v8::WasmStreaming to this callback, which we can |
| 134 | + // use to pass the WebAssembly module bytes to V8 as we receive them. |
| 135 | + // Unfortunately, our fetch() implementation is a JavaScript dependency, so it |
| 136 | + // is difficult to implement the required logic here. Instead, we create a |
| 137 | + // a WasmStreamingObject that encapsulates v8::WasmStreaming and that we can |
| 138 | + // pass to the JavaScript implementation. The JavaScript implementation can |
| 139 | + // then push() bytes from the Response and eventually either finish() or |
| 140 | + // abort() the operation. |
| 141 | + |
| 142 | + // Create the wrapper object. |
| 143 | + std::shared_ptr<WasmStreaming> streaming = |
| 144 | + WasmStreaming::Unpack(info.GetIsolate(), info.Data()); |
| 145 | + Environment* env = Environment::GetCurrent(info); |
| 146 | + Local<Object> obj; |
| 147 | + if (!WasmStreamingObject::Create(env, streaming).ToLocal(&obj)) { |
| 148 | + // A JavaScript exception is pending. Let V8 deal with it. |
| 149 | + return; |
| 150 | + } |
| 151 | + |
| 152 | + // V8 always passes one argument to this callback. |
| 153 | + CHECK_EQ(info.Length(), 1); |
| 154 | + |
| 155 | + // Prepare the JavaScript implementation for invocation. We will pass the |
| 156 | + // WasmStreamingObject as the first argument, followed by the argument that we |
| 157 | + // received from V8, i.e., the first argument passed to compileStreaming (or |
| 158 | + // instantiateStreaming). |
| 159 | + Local<Function> impl = env->wasm_streaming_compilation_impl(); |
| 160 | + CHECK(!impl.IsEmpty()); |
| 161 | + Local<Value> args[] = {obj, info[0]}; |
| 162 | + |
| 163 | + // Hand control to the JavaScript implementation. It should never throw an |
| 164 | + // error, but if it does, we leave it to the calling V8 code to handle that |
| 165 | + // gracefully. Otherwise, we assert that the JavaScript function does not |
| 166 | + // return anything. |
| 167 | + MaybeLocal<Value> maybe_ret = |
| 168 | + impl->Call(env->context(), info.This(), 2, args); |
| 169 | + Local<Value> ret; |
| 170 | + CHECK_IMPLIES(maybe_ret.ToLocal(&ret), ret->IsUndefined()); |
| 171 | +} |
| 172 | + |
| 173 | +// Called once by JavaScript during initialization. |
| 174 | +void SetImplementation(const FunctionCallbackInfo<Value>& info) { |
| 175 | + Environment* env = Environment::GetCurrent(info); |
| 176 | + env->set_wasm_streaming_compilation_impl(info[0].As<Function>()); |
| 177 | +} |
| 178 | + |
| 179 | +void Initialize(Local<Object> target, |
| 180 | + Local<Value>, |
| 181 | + Local<Context> context, |
| 182 | + void*) { |
| 183 | + Environment* env = Environment::GetCurrent(context); |
| 184 | + env->SetMethod(target, "setImplementation", SetImplementation); |
| 185 | +} |
| 186 | + |
| 187 | +void RegisterExternalReferences(ExternalReferenceRegistry* registry) { |
| 188 | + registry->Register(SetImplementation); |
| 189 | +} |
| 190 | + |
| 191 | +} // namespace wasm_web_api |
| 192 | +} // namespace node |
| 193 | + |
| 194 | +NODE_MODULE_CONTEXT_AWARE_INTERNAL(wasm_web_api, node::wasm_web_api::Initialize) |
| 195 | +NODE_MODULE_EXTERNAL_REFERENCE(wasm_web_api, |
| 196 | + node::wasm_web_api::RegisterExternalReferences) |
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