| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/api.h" |
| #include "src/api-natives.h" |
| #include "src/assert-scope.h" |
| #include "src/ast/ast.h" |
| #include "src/ast/scopes.h" |
| #include "src/factory.h" |
| #include "src/handles.h" |
| #include "src/isolate.h" |
| #include "src/objects.h" |
| #include "src/parsing/parser.h" |
| #include "src/typing-asm.h" |
| |
| #include "src/wasm/asm-wasm-builder.h" |
| #include "src/wasm/encoder.h" |
| #include "src/wasm/module-decoder.h" |
| #include "src/wasm/wasm-js.h" |
| #include "src/wasm/wasm-module.h" |
| #include "src/wasm/wasm-result.h" |
| |
| typedef uint8_t byte; |
| |
| using v8::internal::wasm::ErrorThrower; |
| |
| namespace v8 { |
| |
| namespace { |
| struct RawBuffer { |
| const byte* start; |
| const byte* end; |
| size_t size() { return static_cast<size_t>(end - start); } |
| }; |
| |
| RawBuffer GetRawBufferArgument( |
| ErrorThrower& thrower, const v8::FunctionCallbackInfo<v8::Value>& args) { |
| if (args.Length() < 1) { |
| thrower.Error("Argument 0 must be an array buffer"); |
| return {nullptr, nullptr}; |
| } |
| |
| const byte* start = nullptr; |
| const byte* end = nullptr; |
| |
| if (args[0]->IsArrayBuffer()) { |
| // A raw array buffer was passed. |
| Local<ArrayBuffer> buffer = Local<ArrayBuffer>::Cast(args[0]); |
| ArrayBuffer::Contents contents = buffer->GetContents(); |
| |
| start = reinterpret_cast<const byte*>(contents.Data()); |
| end = start + contents.ByteLength(); |
| |
| if (start == nullptr || end == start) { |
| thrower.Error("ArrayBuffer argument is empty"); |
| } |
| } else if (args[0]->IsTypedArray()) { |
| // A TypedArray was passed. |
| Local<TypedArray> array = Local<TypedArray>::Cast(args[0]); |
| Local<ArrayBuffer> buffer = array->Buffer(); |
| |
| ArrayBuffer::Contents contents = buffer->GetContents(); |
| |
| start = |
| reinterpret_cast<const byte*>(contents.Data()) + array->ByteOffset(); |
| end = start + array->ByteLength(); |
| |
| if (start == nullptr || end == start) { |
| thrower.Error("ArrayBuffer argument is empty"); |
| } |
| } else { |
| thrower.Error("Argument 0 must be an ArrayBuffer or Uint8Array"); |
| } |
| |
| return {start, end}; |
| } |
| |
| void VerifyModule(const v8::FunctionCallbackInfo<v8::Value>& args) { |
| HandleScope scope(args.GetIsolate()); |
| i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); |
| ErrorThrower thrower(isolate, "WASM.verifyModule()"); |
| |
| RawBuffer buffer = GetRawBufferArgument(thrower, args); |
| if (thrower.error()) return; |
| |
| i::Zone zone(isolate->allocator()); |
| internal::wasm::ModuleResult result = |
| internal::wasm::DecodeWasmModule(isolate, &zone, buffer.start, buffer.end, |
| true, internal::wasm::kWasmOrigin); |
| |
| if (result.failed()) { |
| thrower.Failed("", result); |
| } |
| |
| if (result.val) delete result.val; |
| } |
| |
| void VerifyFunction(const v8::FunctionCallbackInfo<v8::Value>& args) { |
| HandleScope scope(args.GetIsolate()); |
| i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); |
| ErrorThrower thrower(isolate, "WASM.verifyFunction()"); |
| |
| RawBuffer buffer = GetRawBufferArgument(thrower, args); |
| if (thrower.error()) return; |
| |
| internal::wasm::FunctionResult result; |
| { |
| // Verification of a single function shouldn't allocate. |
| i::DisallowHeapAllocation no_allocation; |
| i::Zone zone(isolate->allocator()); |
| result = internal::wasm::DecodeWasmFunction(isolate, &zone, nullptr, |
| buffer.start, buffer.end); |
| } |
| |
| if (result.failed()) { |
| thrower.Failed("", result); |
| } |
| |
| if (result.val) delete result.val; |
| } |
| |
| v8::internal::wasm::WasmModuleIndex* TranslateAsmModule( |
| i::ParseInfo* info, i::Handle<i::Object> foreign, ErrorThrower* thrower) { |
| info->set_global(); |
| info->set_lazy(false); |
| info->set_allow_lazy_parsing(false); |
| info->set_toplevel(true); |
| |
| if (!i::Compiler::ParseAndAnalyze(info)) { |
| return nullptr; |
| } |
| |
| if (info->scope()->declarations()->length() == 0) { |
| thrower->Error("Asm.js validation failed: no declarations in scope"); |
| return nullptr; |
| } |
| |
| info->set_literal( |
| info->scope()->declarations()->at(0)->AsFunctionDeclaration()->fun()); |
| |
| v8::internal::AsmTyper typer(info->isolate(), info->zone(), *(info->script()), |
| info->literal()); |
| if (i::FLAG_enable_simd_asmjs) { |
| typer.set_allow_simd(true); |
| } |
| if (!typer.Validate()) { |
| thrower->Error("Asm.js validation failed: %s", typer.error_message()); |
| return nullptr; |
| } |
| |
| auto module = |
| v8::internal::wasm::AsmWasmBuilder(info->isolate(), info->zone(), |
| info->literal(), foreign, &typer) |
| .Run(); |
| |
| return module; |
| } |
| |
| void InstantiateModuleCommon(const v8::FunctionCallbackInfo<v8::Value>& args, |
| const byte* start, const byte* end, |
| ErrorThrower* thrower, |
| internal::wasm::ModuleOrigin origin) { |
| i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); |
| |
| i::Handle<i::JSArrayBuffer> memory = i::Handle<i::JSArrayBuffer>::null(); |
| if (args.Length() > 2 && args[2]->IsArrayBuffer()) { |
| Local<Object> obj = Local<Object>::Cast(args[2]); |
| i::Handle<i::Object> mem_obj = v8::Utils::OpenHandle(*obj); |
| memory = i::Handle<i::JSArrayBuffer>(i::JSArrayBuffer::cast(*mem_obj)); |
| } |
| |
| // Decode but avoid a redundant pass over function bodies for verification. |
| // Verification will happen during compilation. |
| i::Zone zone(isolate->allocator()); |
| internal::wasm::ModuleResult result = internal::wasm::DecodeWasmModule( |
| isolate, &zone, start, end, false, origin); |
| |
| if (result.failed() && origin == internal::wasm::kAsmJsOrigin) { |
| thrower->Error("Asm.js converted module failed to decode"); |
| } else if (result.failed()) { |
| thrower->Failed("", result); |
| } else { |
| // Success. Instantiate the module and return the object. |
| i::Handle<i::JSReceiver> ffi = i::Handle<i::JSObject>::null(); |
| if (args.Length() > 1 && args[1]->IsObject()) { |
| Local<Object> obj = Local<Object>::Cast(args[1]); |
| ffi = i::Handle<i::JSReceiver>::cast(v8::Utils::OpenHandle(*obj)); |
| } |
| |
| i::MaybeHandle<i::JSObject> object = |
| result.val->Instantiate(isolate, ffi, memory); |
| |
| if (!object.is_null()) { |
| args.GetReturnValue().Set(v8::Utils::ToLocal(object.ToHandleChecked())); |
| } |
| } |
| |
| if (result.val) delete result.val; |
| } |
| |
| void InstantiateModuleFromAsm(const v8::FunctionCallbackInfo<v8::Value>& args) { |
| HandleScope scope(args.GetIsolate()); |
| i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); |
| ErrorThrower thrower(isolate, "WASM.instantiateModuleFromAsm()"); |
| |
| if (!args[0]->IsString()) { |
| thrower.Error("Asm module text should be a string"); |
| return; |
| } |
| |
| i::Factory* factory = isolate->factory(); |
| i::Zone zone(isolate->allocator()); |
| Local<String> source = Local<String>::Cast(args[0]); |
| i::Handle<i::Script> script = factory->NewScript(Utils::OpenHandle(*source)); |
| i::ParseInfo info(&zone, script); |
| |
| i::Handle<i::Object> foreign; |
| if (args.Length() > 1 && args[1]->IsObject()) { |
| Local<Object> local_foreign = Local<Object>::Cast(args[1]); |
| foreign = v8::Utils::OpenHandle(*local_foreign); |
| } |
| |
| auto module = TranslateAsmModule(&info, foreign, &thrower); |
| if (module == nullptr) { |
| return; |
| } |
| |
| InstantiateModuleCommon(args, module->Begin(), module->End(), &thrower, |
| internal::wasm::kAsmJsOrigin); |
| } |
| |
| void InstantiateModule(const v8::FunctionCallbackInfo<v8::Value>& args) { |
| HandleScope scope(args.GetIsolate()); |
| i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate()); |
| ErrorThrower thrower(isolate, "WASM.instantiateModule()"); |
| |
| RawBuffer buffer = GetRawBufferArgument(thrower, args); |
| if (buffer.start == nullptr) return; |
| |
| InstantiateModuleCommon(args, buffer.start, buffer.end, &thrower, |
| internal::wasm::kWasmOrigin); |
| } |
| } // namespace |
| |
| // TODO(titzer): we use the API to create the function template because the |
| // internal guts are too ugly to replicate here. |
| static i::Handle<i::FunctionTemplateInfo> NewTemplate(i::Isolate* i_isolate, |
| FunctionCallback func) { |
| Isolate* isolate = reinterpret_cast<Isolate*>(i_isolate); |
| Local<FunctionTemplate> local = FunctionTemplate::New(isolate, func); |
| return v8::Utils::OpenHandle(*local); |
| } |
| |
| namespace internal { |
| static Handle<String> v8_str(Isolate* isolate, const char* str) { |
| return isolate->factory()->NewStringFromAsciiChecked(str); |
| } |
| |
| static void InstallFunc(Isolate* isolate, Handle<JSObject> object, |
| const char* str, FunctionCallback func) { |
| Handle<String> name = v8_str(isolate, str); |
| Handle<FunctionTemplateInfo> temp = NewTemplate(isolate, func); |
| Handle<JSFunction> function = |
| ApiNatives::InstantiateFunction(temp).ToHandleChecked(); |
| PropertyAttributes attributes = |
| static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY); |
| JSObject::AddProperty(object, name, function, attributes); |
| } |
| |
| void WasmJs::Install(Isolate* isolate, Handle<JSGlobalObject> global) { |
| // Setup wasm function map. |
| Handle<Context> context(global->native_context(), isolate); |
| InstallWasmFunctionMap(isolate, context); |
| |
| // Bind the WASM object. |
| Factory* factory = isolate->factory(); |
| Handle<String> name = v8_str(isolate, "Wasm"); |
| Handle<JSFunction> cons = factory->NewFunction(name); |
| JSFunction::SetInstancePrototype( |
| cons, Handle<Object>(context->initial_object_prototype(), isolate)); |
| cons->shared()->set_instance_class_name(*name); |
| Handle<JSObject> wasm_object = factory->NewJSObject(cons, TENURED); |
| PropertyAttributes attributes = static_cast<PropertyAttributes>(DONT_ENUM); |
| JSObject::AddProperty(global, name, wasm_object, attributes); |
| |
| // Install functions on the WASM object. |
| InstallFunc(isolate, wasm_object, "verifyModule", VerifyModule); |
| InstallFunc(isolate, wasm_object, "verifyFunction", VerifyFunction); |
| InstallFunc(isolate, wasm_object, "instantiateModule", InstantiateModule); |
| InstallFunc(isolate, wasm_object, "instantiateModuleFromAsm", |
| InstantiateModuleFromAsm); |
| |
| { |
| // Add the Wasm.experimentalVersion property. |
| Handle<String> name = v8_str(isolate, "experimentalVersion"); |
| PropertyAttributes attributes = |
| static_cast<PropertyAttributes>(DONT_DELETE | READ_ONLY); |
| Handle<Smi> value = Handle<Smi>(Smi::FromInt(wasm::kWasmVersion), isolate); |
| JSObject::AddProperty(wasm_object, name, value, attributes); |
| } |
| } |
| |
| void WasmJs::InstallWasmFunctionMap(Isolate* isolate, Handle<Context> context) { |
| if (!context->get(Context::WASM_FUNCTION_MAP_INDEX)->IsMap()) { |
| // TODO(titzer): Move this to bootstrapper.cc?? |
| // TODO(titzer): Also make one for strict mode functions? |
| Handle<Map> prev_map = Handle<Map>(context->sloppy_function_map(), isolate); |
| |
| InstanceType instance_type = prev_map->instance_type(); |
| int internal_fields = JSObject::GetInternalFieldCount(*prev_map); |
| CHECK_EQ(0, internal_fields); |
| int pre_allocated = |
| prev_map->GetInObjectProperties() - prev_map->unused_property_fields(); |
| int instance_size; |
| int in_object_properties; |
| JSFunction::CalculateInstanceSizeHelper(instance_type, internal_fields + 1, |
| 0, &instance_size, |
| &in_object_properties); |
| |
| int unused_property_fields = in_object_properties - pre_allocated; |
| Handle<Map> map = Map::CopyInitialMap( |
| prev_map, instance_size, in_object_properties, unused_property_fields); |
| |
| context->set_wasm_function_map(*map); |
| } |
| } |
| |
| } // namespace internal |
| } // namespace v8 |