| // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /* <GEN_DOC> */ |
| |
| // ignore_for_file: cascade_invocations |
| // ignore_for_file: non_constant_identifier_names |
| // ignore_for_file: unused_field |
| |
| part of 'runtime.dart'; |
| |
| class WasmRuntime { |
| static WasmRuntime? _inst; |
| |
| DynamicLibrary _lib; |
| late Pointer<WasmerEngine> _engine; |
| Map<int, _WasmTrapsEntry> traps = {}; |
| |
| /* <RUNTIME_MEMB> */ |
| |
| factory WasmRuntime() => _inst ??= WasmRuntime._init(); |
| |
| WasmRuntime._init() : _lib = DynamicLibrary.open(_getLibPath()) { |
| /* <RUNTIME_LOAD> */ |
| |
| if (_Dart_InitializeApiDL(NativeApi.initializeApiDLData) != 0) { |
| throw Exception('Failed to initialize Dart API'); |
| } |
| _engine = _engine_new(); |
| _checkNotEqual(_engine, nullptr, 'Failed to initialize Wasm engine.'); |
| _set_finalizer_for_engine(this, _engine); |
| } |
| |
| Pointer<WasmerStore> newStore(Object owner) { |
| var store = _checkNotEqual( |
| _store_new(_engine), |
| nullptr, |
| 'Failed to create Wasm store.', |
| ); |
| _set_finalizer_for_store(owner, store); |
| return store; |
| } |
| |
| Pointer<WasmerModule> compile( |
| Object owner, |
| Pointer<WasmerStore> store, |
| Uint8List data, |
| ) { |
| var dataPtr = calloc<Uint8>(data.length); |
| for (var i = 0; i < data.length; ++i) { |
| dataPtr[i] = data[i]; |
| } |
| var dataVec = calloc<WasmerByteVec>(); |
| dataVec.ref.data = dataPtr; |
| dataVec.ref.length = data.length; |
| |
| var modulePtr = _module_new(store, dataVec); |
| |
| calloc.free(dataPtr); |
| calloc.free(dataVec); |
| |
| _checkNotEqual(modulePtr, nullptr, 'Wasm module compile failed.'); |
| _set_finalizer_for_module(owner, modulePtr); |
| return modulePtr; |
| } |
| |
| List<WasmExportDescriptor> exportDescriptors(Pointer<WasmerModule> module) { |
| var exportsVec = calloc<WasmerExporttypeVec>(); |
| _module_exports(module, exportsVec); |
| var exps = <WasmExportDescriptor>[]; |
| for (var i = 0; i < exportsVec.ref.length; ++i) { |
| var exp = exportsVec.ref.data[i]; |
| var extern = _exporttype_type(exp); |
| var kind = _externtype_kind(extern); |
| var fnType = kind == WasmerExternKindFunction |
| ? _externtype_as_functype(extern) |
| : nullptr; |
| exps.add( |
| WasmExportDescriptor( |
| kind, |
| _exporttype_name(exp).ref.toString(), |
| fnType, |
| ), |
| ); |
| } |
| calloc.free(exportsVec); |
| return exps; |
| } |
| |
| List<WasmImportDescriptor> importDescriptors(Pointer<WasmerModule> module) { |
| var importsVec = calloc<WasmerImporttypeVec>(); |
| _module_imports(module, importsVec); |
| var imps = <WasmImportDescriptor>[]; |
| for (var i = 0; i < importsVec.ref.length; ++i) { |
| var imp = importsVec.ref.data[i]; |
| var extern = _importtype_type(imp); |
| var kind = _externtype_kind(extern); |
| var fnType = kind == WasmerExternKindFunction |
| ? _externtype_as_functype(extern) |
| : nullptr; |
| imps.add( |
| WasmImportDescriptor( |
| kind, |
| _importtype_module(imp).ref.toString(), |
| _importtype_name(imp).ref.toString(), |
| fnType, |
| ), |
| ); |
| } |
| calloc.free(importsVec); |
| return imps; |
| } |
| |
| void maybeThrowTrap(Pointer<WasmerTrap> trap, String source) { |
| if (trap != nullptr) { |
| // There are 2 kinds of trap, and their memory is managed differently. |
| // Traps created in the newTrap method below are stored in the traps map |
| // with a corresponding exception, and their memory is managed using a |
| // finalizer on the _WasmTrapsEntry. Traps can also be created by WASM |
| // code, and in that case we delete them in this function. |
| var entry = traps[trap.address]; |
| if (entry != null) { |
| traps.remove(entry); |
| // ignore: only_throw_errors |
| throw entry.exception; |
| } else { |
| var trapMessage = calloc<WasmerByteVec>(); |
| _trap_message(trap, trapMessage); |
| var message = 'Wasm trap when calling $source: ${trapMessage.ref}'; |
| _byte_vec_delete(trapMessage); |
| calloc.free(trapMessage); |
| _trap_delete(trap); |
| throw Exception(message); |
| } |
| } |
| } |
| |
| Pointer<WasmerInstance> instantiate( |
| Object owner, |
| Pointer<WasmerStore> store, |
| Pointer<WasmerModule> module, |
| Pointer<WasmerExternVec> imports, |
| ) { |
| var trap = calloc<Pointer<WasmerTrap>>(); |
| trap.value = nullptr; |
| var inst = _instance_new(store, module, imports, trap); |
| maybeThrowTrap(trap.value, 'module initialization function'); |
| calloc.free(trap); |
| _checkNotEqual(inst, nullptr, 'Wasm module instantiation failed.'); |
| _set_finalizer_for_instance(owner, inst); |
| return inst; |
| } |
| |
| // Clean up the exports after use, with deleteExports. |
| Pointer<WasmerExternVec> exports(Pointer<WasmerInstance> instancePtr) { |
| var exports = calloc<WasmerExternVec>(); |
| _instance_exports(instancePtr, exports); |
| return exports; |
| } |
| |
| void deleteExports(Pointer<WasmerExternVec> exports) { |
| _extern_vec_delete(exports); |
| calloc.free(exports); |
| } |
| |
| int externKind(Pointer<WasmerExtern> extern) => _extern_kind(extern); |
| |
| Pointer<WasmerFunc> externToFunction(Pointer<WasmerExtern> extern) => |
| _extern_as_func(extern); |
| |
| Pointer<WasmerExtern> functionToExtern(Pointer<WasmerFunc> func) => |
| _func_as_extern(func); |
| |
| List<int> getArgTypes(Pointer<WasmerFunctype> funcType) { |
| var types = <int>[]; |
| var args = _functype_params(funcType); |
| for (var i = 0; i < args.ref.length; ++i) { |
| types.add(_valtype_kind(args.ref.data[i])); |
| } |
| return types; |
| } |
| |
| int getReturnType(Pointer<WasmerFunctype> funcType) { |
| var rets = _functype_results(funcType); |
| if (rets.ref.length == 0) { |
| return WasmerValKindVoid; |
| } else if (rets.ref.length > 1) { |
| throw Exception('Multiple return values are not supported'); |
| } |
| return _valtype_kind(rets.ref.data[0]); |
| } |
| |
| void call( |
| Pointer<WasmerFunc> func, |
| Pointer<WasmerValVec> args, |
| Pointer<WasmerValVec> results, |
| String source, |
| ) { |
| maybeThrowTrap(_func_call(func, args, results), source); |
| } |
| |
| Pointer<WasmerMemory> externToMemory(Pointer<WasmerExtern> extern) => |
| _extern_as_memory(extern); |
| |
| Pointer<WasmerExtern> memoryToExtern(Pointer<WasmerMemory> memory) => |
| _memory_as_extern(memory); |
| |
| Pointer<WasmerMemory> newMemory( |
| Object owner, |
| Pointer<WasmerStore> store, |
| int pages, |
| int? maxPages, |
| ) { |
| var limPtr = calloc<WasmerLimits>(); |
| limPtr.ref.min = pages; |
| limPtr.ref.max = maxPages ?? wasm_limits_max_default; |
| var memType = _memorytype_new(limPtr); |
| calloc.free(limPtr); |
| _checkNotEqual(memType, nullptr, 'Failed to create memory type.'); |
| _set_finalizer_for_memorytype(owner, memType); |
| var memory = _checkNotEqual( |
| _memory_new(store, memType), |
| nullptr, |
| 'Failed to create memory.', |
| ); |
| _set_finalizer_for_memory(owner, memory); |
| return memory; |
| } |
| |
| void growMemory(Pointer<WasmerMemory> memory, int deltaPages) { |
| _checkNotEqual( |
| _memory_grow(memory, deltaPages), |
| 0, |
| 'Failed to grow memory.', |
| ); |
| } |
| |
| int memoryLength(Pointer<WasmerMemory> memory) => _memory_size(memory); |
| |
| Uint8List memoryView(Pointer<WasmerMemory> memory) => |
| _memory_data(memory).asTypedList(_memory_data_size(memory)); |
| |
| Pointer<WasmerFunc> newFunc( |
| Object owner, |
| Pointer<WasmerStore> store, |
| Pointer<WasmerFunctype> funcType, |
| Pointer func, |
| Pointer env, |
| Pointer finalizer, |
| ) { |
| var f = _func_new_with_env( |
| store, |
| funcType, |
| func.cast(), |
| env.cast(), |
| finalizer.cast(), |
| ); |
| _checkNotEqual(f, nullptr, 'Failed to create function.'); |
| _set_finalizer_for_func(owner, f); |
| return f; |
| } |
| |
| Pointer<WasmerTrap> newTrap(Pointer<WasmerStore> store, Object exception) { |
| var msg = calloc<WasmerByteVec>(); |
| msg.ref.data = calloc<Uint8>(); |
| msg.ref.data[0] = 0; |
| msg.ref.length = 0; |
| var trap = _trap_new(store, msg); |
| calloc.free(msg.ref.data); |
| calloc.free(msg); |
| _checkNotEqual(trap, nullptr, 'Failed to create trap.'); |
| var entry = _WasmTrapsEntry(exception); |
| _set_finalizer_for_trap(entry, trap); |
| traps[trap.address] = entry; |
| return trap; |
| } |
| |
| Pointer<WasmerWasiConfig> newWasiConfig() { |
| var name = calloc<Uint8>(); |
| name[0] = 0; |
| var config = _wasi_config_new(name); |
| calloc.free(name); |
| return _checkNotEqual(config, nullptr, 'Failed to create WASI config.'); |
| } |
| |
| void captureWasiStdout(Pointer<WasmerWasiConfig> config) { |
| _wasi_config_inherit_stdout(config); |
| } |
| |
| void captureWasiStderr(Pointer<WasmerWasiConfig> config) { |
| _wasi_config_inherit_stderr(config); |
| } |
| |
| Pointer<WasmerWasiEnv> newWasiEnv(Pointer<WasmerWasiConfig> config) => |
| _checkNotEqual( |
| _wasi_env_new(config), |
| nullptr, |
| 'Failed to create WASI environment.', |
| ); |
| |
| void wasiEnvSetMemory( |
| Pointer<WasmerWasiEnv> env, |
| Pointer<WasmerMemory> memory, |
| ) { |
| _wasi_env_set_memory(env, memory); |
| } |
| |
| void getWasiImports( |
| Pointer<WasmerStore> store, |
| Pointer<WasmerModule> mod, |
| Pointer<WasmerWasiEnv> env, |
| Pointer<WasmerExternVec> imports, |
| ) { |
| _checkNotEqual( |
| _wasi_get_imports(store, mod, env, imports), |
| 0, |
| 'Failed to fill WASI imports.', |
| ); |
| } |
| |
| Stream<List<int>> getWasiStdoutStream(Pointer<WasmerWasiEnv> env) => |
| Stream.fromIterable(_WasiStreamIterable(env, _wasi_env_read_stdout)); |
| |
| Stream<List<int>> getWasiStderrStream(Pointer<WasmerWasiEnv> env) => |
| Stream.fromIterable(_WasiStreamIterable(env, _wasi_env_read_stderr)); |
| |
| String _getLastError() { |
| var length = _wasmer_last_error_length(); |
| var buf = calloc<Uint8>(length); |
| _wasmer_last_error_message(buf, length); |
| var message = utf8.decode(buf.asTypedList(length)); |
| calloc.free(buf); |
| return message; |
| } |
| |
| T _checkNotEqual<T>(T x, T y, String errorMessage) { |
| if (x == y) { |
| throw Exception('$errorMessage\n${_getLastError()}'); |
| } |
| return x; |
| } |
| |
| static String getSignatureString( |
| String name, |
| List<int> argTypes, |
| int returnType, |
| ) => |
| '${wasmerValKindName(returnType)} ' |
| "$name(${argTypes.map(wasmerValKindName).join(", ")})"; |
| } |