// 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 <functional> #include <memory> #include "src/api-inl.h" #include "src/assembler-inl.h" #include "src/compiler/wasm-compiler.h" #include "src/debug/interface-types.h" #include "src/frames-inl.h" #include "src/objects.h" #include "src/property-descriptor.h" #include "src/simulator.h" #include "src/snapshot/snapshot.h" #include "src/v8.h" #include "src/wasm/module-decoder.h" #include "src/wasm/wasm-code-manager.h" #include "src/wasm/wasm-js.h" #include "src/wasm/wasm-module.h" #include "src/wasm/wasm-objects-inl.h" #include "src/wasm/wasm-result.h" namespace v8 { namespace internal { namespace wasm { // static const WasmExceptionSig WasmException::empty_sig_(0, 0, nullptr); // static constexpr const char* WasmException::kRuntimeIdStr; // static constexpr const char* WasmException::kRuntimeValuesStr; WireBytesRef WasmModule::LookupFunctionName(const ModuleWireBytes& wire_bytes, uint32_t function_index) const { if (!function_names) { function_names.reset(new std::unordered_map<uint32_t, WireBytesRef>()); wasm::DecodeFunctionNames(wire_bytes.start(), wire_bytes.end(), function_names.get()); } auto it = function_names->find(function_index); if (it == function_names->end()) return WireBytesRef(); return it->second; } void WasmModule::AddFunctionNameForTesting(int function_index, WireBytesRef name) { if (!function_names) { function_names.reset(new std::unordered_map<uint32_t, WireBytesRef>()); } function_names->insert(std::make_pair(function_index, name)); } // Get a string stored in the module bytes representing a name. WasmName ModuleWireBytes::GetName(WireBytesRef ref) const { if (ref.is_empty()) return {"<?>", 3}; // no name. CHECK(BoundsCheck(ref.offset(), ref.length())); return WasmName::cast( module_bytes_.SubVector(ref.offset(), ref.end_offset())); } // Get a string stored in the module bytes representing a function name. WasmName ModuleWireBytes::GetName(const WasmFunction* function, const WasmModule* module) const { return GetName(module->LookupFunctionName(*this, function->func_index)); } // Get a string stored in the module bytes representing a name. WasmName ModuleWireBytes::GetNameOrNull(WireBytesRef ref) const { if (!ref.is_set()) return {nullptr, 0}; // no name. CHECK(BoundsCheck(ref.offset(), ref.length())); return WasmName::cast( module_bytes_.SubVector(ref.offset(), ref.end_offset())); } // Get a string stored in the module bytes representing a function name. WasmName ModuleWireBytes::GetNameOrNull(const WasmFunction* function, const WasmModule* module) const { return GetNameOrNull(module->LookupFunctionName(*this, function->func_index)); } std::ostream& operator<<(std::ostream& os, const WasmFunctionName& name) { os << "#" << name.function_->func_index; if (!name.name_.is_empty()) { if (name.name_.start()) { os << ":"; os.write(name.name_.start(), name.name_.length()); } } else { os << "?"; } return os; } WasmModule::WasmModule(std::unique_ptr<Zone> owned) : signature_zone(std::move(owned)) {} bool IsWasmCodegenAllowed(Isolate* isolate, Handle<Context> context) { // TODO(wasm): Once wasm has its own CSP policy, we should introduce a // separate callback that includes information about the module about to be // compiled. For the time being, pass an empty string as placeholder for the // sources. if (auto wasm_codegen_callback = isolate->allow_wasm_code_gen_callback()) { return wasm_codegen_callback( v8::Utils::ToLocal(context), v8::Utils::ToLocal(isolate->factory()->empty_string())); } auto codegen_callback = isolate->allow_code_gen_callback(); return codegen_callback == nullptr || codegen_callback( v8::Utils::ToLocal(context), v8::Utils::ToLocal(isolate->factory()->empty_string())); } Handle<JSArray> GetImports(Isolate* isolate, Handle<WasmModuleObject> module_object) { Factory* factory = isolate->factory(); Handle<String> module_string = factory->InternalizeUtf8String("module"); Handle<String> name_string = factory->InternalizeUtf8String("name"); Handle<String> kind_string = factory->InternalizeUtf8String("kind"); Handle<String> function_string = factory->InternalizeUtf8String("function"); Handle<String> table_string = factory->InternalizeUtf8String("table"); Handle<String> memory_string = factory->InternalizeUtf8String("memory"); Handle<String> global_string = factory->InternalizeUtf8String("global"); // Create the result array. const WasmModule* module = module_object->module(); int num_imports = static_cast<int>(module->import_table.size()); Handle<JSArray> array_object = factory->NewJSArray(PACKED_ELEMENTS, 0, 0); Handle<FixedArray> storage = factory->NewFixedArray(num_imports); JSArray::SetContent(array_object, storage); array_object->set_length(Smi::FromInt(num_imports)); Handle<JSFunction> object_function = Handle<JSFunction>(isolate->native_context()->object_function(), isolate); // Populate the result array. for (int index = 0; index < num_imports; ++index) { const WasmImport& import = module->import_table[index]; Handle<JSObject> entry = factory->NewJSObject(object_function); Handle<String> import_kind; switch (import.kind) { case kExternalFunction: import_kind = function_string; break; case kExternalTable: import_kind = table_string; break; case kExternalMemory: import_kind = memory_string; break; case kExternalGlobal: import_kind = global_string; break; default: UNREACHABLE(); } MaybeHandle<String> import_module = WasmModuleObject::ExtractUtf8StringFromModuleBytes( isolate, module_object, import.module_name); MaybeHandle<String> import_name = WasmModuleObject::ExtractUtf8StringFromModuleBytes( isolate, module_object, import.field_name); JSObject::AddProperty(isolate, entry, module_string, import_module.ToHandleChecked(), NONE); JSObject::AddProperty(isolate, entry, name_string, import_name.ToHandleChecked(), NONE); JSObject::AddProperty(isolate, entry, kind_string, import_kind, NONE); storage->set(index, *entry); } return array_object; } Handle<JSArray> GetExports(Isolate* isolate, Handle<WasmModuleObject> module_object) { Factory* factory = isolate->factory(); Handle<String> name_string = factory->InternalizeUtf8String("name"); Handle<String> kind_string = factory->InternalizeUtf8String("kind"); Handle<String> function_string = factory->InternalizeUtf8String("function"); Handle<String> table_string = factory->InternalizeUtf8String("table"); Handle<String> memory_string = factory->InternalizeUtf8String("memory"); Handle<String> global_string = factory->InternalizeUtf8String("global"); // Create the result array. const WasmModule* module = module_object->module(); int num_exports = static_cast<int>(module->export_table.size()); Handle<JSArray> array_object = factory->NewJSArray(PACKED_ELEMENTS, 0, 0); Handle<FixedArray> storage = factory->NewFixedArray(num_exports); JSArray::SetContent(array_object, storage); array_object->set_length(Smi::FromInt(num_exports)); Handle<JSFunction> object_function = Handle<JSFunction>(isolate->native_context()->object_function(), isolate); // Populate the result array. for (int index = 0; index < num_exports; ++index) { const WasmExport& exp = module->export_table[index]; Handle<String> export_kind; switch (exp.kind) { case kExternalFunction: export_kind = function_string; break; case kExternalTable: export_kind = table_string; break; case kExternalMemory: export_kind = memory_string; break; case kExternalGlobal: export_kind = global_string; break; default: UNREACHABLE(); } Handle<JSObject> entry = factory->NewJSObject(object_function); MaybeHandle<String> export_name = WasmModuleObject::ExtractUtf8StringFromModuleBytes( isolate, module_object, exp.name); JSObject::AddProperty(isolate, entry, name_string, export_name.ToHandleChecked(), NONE); JSObject::AddProperty(isolate, entry, kind_string, export_kind, NONE); storage->set(index, *entry); } return array_object; } Handle<JSArray> GetCustomSections(Isolate* isolate, Handle<WasmModuleObject> module_object, Handle<String> name, ErrorThrower* thrower) { Factory* factory = isolate->factory(); Vector<const uint8_t> wire_bytes = module_object->native_module()->wire_bytes(); std::vector<CustomSectionOffset> custom_sections = DecodeCustomSections(wire_bytes.start(), wire_bytes.end()); std::vector<Handle<Object>> matching_sections; // Gather matching sections. for (auto& section : custom_sections) { MaybeHandle<String> section_name = WasmModuleObject::ExtractUtf8StringFromModuleBytes( isolate, module_object, section.name); if (!name->Equals(*section_name.ToHandleChecked())) continue; // Make a copy of the payload data in the section. size_t size = section.payload.length(); void* memory = size == 0 ? nullptr : isolate->array_buffer_allocator()->Allocate(size); if (size && !memory) { thrower->RangeError("out of memory allocating custom section data"); return Handle<JSArray>(); } Handle<JSArrayBuffer> buffer = isolate->factory()->NewJSArrayBuffer(); constexpr bool is_external = false; JSArrayBuffer::Setup(buffer, isolate, is_external, memory, size); memcpy(memory, wire_bytes.start() + section.payload.offset(), section.payload.length()); matching_sections.push_back(buffer); } int num_custom_sections = static_cast<int>(matching_sections.size()); Handle<JSArray> array_object = factory->NewJSArray(PACKED_ELEMENTS, 0, 0); Handle<FixedArray> storage = factory->NewFixedArray(num_custom_sections); JSArray::SetContent(array_object, storage); array_object->set_length(Smi::FromInt(num_custom_sections)); for (int i = 0; i < num_custom_sections; i++) { storage->set(i, *matching_sections[i]); } return array_object; } Handle<FixedArray> DecodeLocalNames(Isolate* isolate, Handle<WasmModuleObject> module_object) { Vector<const uint8_t> wire_bytes = module_object->native_module()->wire_bytes(); LocalNames decoded_locals; DecodeLocalNames(wire_bytes.start(), wire_bytes.end(), &decoded_locals); Handle<FixedArray> locals_names = isolate->factory()->NewFixedArray(decoded_locals.max_function_index + 1); for (LocalNamesPerFunction& func : decoded_locals.names) { Handle<FixedArray> func_locals_names = isolate->factory()->NewFixedArray(func.max_local_index + 1); locals_names->set(func.function_index, *func_locals_names); for (LocalName& name : func.names) { Handle<String> name_str = WasmModuleObject::ExtractUtf8StringFromModuleBytes( isolate, module_object, name.name) .ToHandleChecked(); func_locals_names->set(name.local_index, *name_str); } } return locals_names; } namespace { template <typename T> inline size_t VectorSize(const std::vector<T>& vector) { return sizeof(T) * vector.size(); } } // namespace size_t EstimateWasmModuleSize(const WasmModule* module) { size_t estimate = sizeof(WasmModule) + VectorSize(module->signatures) + VectorSize(module->signature_ids) + VectorSize(module->functions) + VectorSize(module->data_segments) + VectorSize(module->tables) + VectorSize(module->import_table) + VectorSize(module->export_table) + VectorSize(module->exceptions) + VectorSize(module->table_inits); // TODO(wasm): include names table and wire bytes in size estimate return estimate; } } // namespace wasm } // namespace internal } // namespace v8