| File: | out/../deps/v8/src/wasm/module-instantiate.cc |
| Warning: | line 475, column 17 Value stored to 'native_module' during its initialization is never read |
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| 1 | // Copyright 2019 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/wasm/module-instantiate.h" |
| 6 | |
| 7 | #include "src/api/api-inl.h" |
| 8 | #include "src/asmjs/asm-js.h" |
| 9 | #include "src/base/atomicops.h" |
| 10 | #include "src/base/platform/wrappers.h" |
| 11 | #include "src/logging/counters-scopes.h" |
| 12 | #include "src/logging/metrics.h" |
| 13 | #include "src/numbers/conversions-inl.h" |
| 14 | #include "src/objects/descriptor-array-inl.h" |
| 15 | #include "src/objects/property-descriptor.h" |
| 16 | #include "src/tracing/trace-event.h" |
| 17 | #include "src/utils/utils.h" |
| 18 | #include "src/wasm/code-space-access.h" |
| 19 | #include "src/wasm/init-expr-interface.h" |
| 20 | #include "src/wasm/module-compiler.h" |
| 21 | #include "src/wasm/wasm-constants.h" |
| 22 | #include "src/wasm/wasm-engine.h" |
| 23 | #include "src/wasm/wasm-external-refs.h" |
| 24 | #include "src/wasm/wasm-import-wrapper-cache.h" |
| 25 | #include "src/wasm/wasm-module.h" |
| 26 | #include "src/wasm/wasm-objects-inl.h" |
| 27 | #include "src/wasm/wasm-opcodes-inl.h" |
| 28 | #include "src/wasm/wasm-subtyping.h" |
| 29 | #include "src/wasm/wasm-value.h" |
| 30 | |
| 31 | #define TRACE(...) \ |
| 32 | do { \ |
| 33 | if (FLAG_trace_wasm_instances) PrintF(__VA_ARGS__); \ |
| 34 | } while (false) |
| 35 | |
| 36 | namespace v8 { |
| 37 | namespace internal { |
| 38 | namespace wasm { |
| 39 | |
| 40 | namespace { |
| 41 | |
| 42 | byte* raw_buffer_ptr(MaybeHandle<JSArrayBuffer> buffer, int offset) { |
| 43 | return static_cast<byte*>(buffer.ToHandleChecked()->backing_store()) + offset; |
| 44 | } |
| 45 | |
| 46 | using ImportWrapperQueue = WrapperQueue<WasmImportWrapperCache::CacheKey, |
| 47 | WasmImportWrapperCache::CacheKeyHash>; |
| 48 | |
| 49 | class CompileImportWrapperJob final : public JobTask { |
| 50 | public: |
| 51 | CompileImportWrapperJob( |
| 52 | Counters* counters, NativeModule* native_module, |
| 53 | ImportWrapperQueue* queue, |
| 54 | WasmImportWrapperCache::ModificationScope* cache_scope) |
| 55 | : counters_(counters), |
| 56 | native_module_(native_module), |
| 57 | queue_(queue), |
| 58 | cache_scope_(cache_scope) {} |
| 59 | |
| 60 | size_t GetMaxConcurrency(size_t worker_count) const override { |
| 61 | size_t flag_limit = |
| 62 | static_cast<size_t>(std::max(1, FLAG_wasm_num_compilation_tasks)); |
| 63 | // Add {worker_count} to the queue size because workers might still be |
| 64 | // processing units that have already been popped from the queue. |
| 65 | return std::min(flag_limit, worker_count + queue_->size()); |
| 66 | } |
| 67 | |
| 68 | void Run(JobDelegate* delegate) override { |
| 69 | TRACE_EVENT0("v8.wasm", "wasm.CompileImportWrapperJob.Run")static v8::base::AtomicWord trace_event_unique_atomic69 = 0; const uint8_t* trace_event_unique_category_group_enabled69; trace_event_unique_category_group_enabled69 = reinterpret_cast<const uint8_t*>(v8::base::Relaxed_Load (&(trace_event_unique_atomic69))); if (!trace_event_unique_category_group_enabled69 ) { trace_event_unique_category_group_enabled69 = v8::internal ::tracing::TraceEventHelper::GetTracingController() ->GetCategoryGroupEnabled ("v8.wasm"); v8::base::Relaxed_Store(&(trace_event_unique_atomic69 ), (reinterpret_cast<v8::base::AtomicWord>( trace_event_unique_category_group_enabled69 ))); };; v8::internal::tracing::ScopedTracer trace_event_unique_tracer69 ; if (v8::base::Relaxed_Load(reinterpret_cast<const v8::base ::Atomic8*>( trace_event_unique_category_group_enabled69)) & (kEnabledForRecording_CategoryGroupEnabledFlags | kEnabledForEventCallback_CategoryGroupEnabledFlags )) { uint64_t h = v8::internal::tracing::AddTraceEvent( ('X') , trace_event_unique_category_group_enabled69, "wasm.CompileImportWrapperJob.Run" , v8::internal::tracing::kGlobalScope, v8::internal::tracing:: kNoId, v8::internal::tracing::kNoId, (static_cast<unsigned int>(0))); trace_event_unique_tracer69 .Initialize(trace_event_unique_category_group_enabled69 , "wasm.CompileImportWrapperJob.Run", h); }; |
| 70 | while (base::Optional<WasmImportWrapperCache::CacheKey> key = |
| 71 | queue_->pop()) { |
| 72 | // TODO(wasm): Batch code publishing, to avoid repeated locking and |
| 73 | // permission switching. |
| 74 | CompileImportWrapper(native_module_, counters_, key->kind, key->signature, |
| 75 | key->expected_arity, key->suspend, cache_scope_); |
| 76 | if (delegate->ShouldYield()) return; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | private: |
| 81 | Counters* const counters_; |
| 82 | NativeModule* const native_module_; |
| 83 | ImportWrapperQueue* const queue_; |
| 84 | WasmImportWrapperCache::ModificationScope* const cache_scope_; |
| 85 | }; |
| 86 | |
| 87 | Handle<DescriptorArray> CreateStructDescriptorArray( |
| 88 | Isolate* isolate, const wasm::StructType* type) { |
| 89 | if (type->field_count() == 0) { |
| 90 | return isolate->factory()->empty_descriptor_array(); |
| 91 | } |
| 92 | uint32_t field_count = type->field_count(); |
| 93 | static_assert(kV8MaxWasmStructFields <= kMaxNumberOfDescriptors, |
| 94 | "Bigger numbers of struct fields require different approach"); |
| 95 | Handle<DescriptorArray> descriptors = |
| 96 | isolate->factory()->NewDescriptorArray(field_count); |
| 97 | |
| 98 | // TODO(ishell): cache Wasm field type in FieldType value. |
| 99 | MaybeObject any_type = MaybeObject::FromObject(FieldType::Any()); |
| 100 | DCHECK(any_type->IsSmi())((void) 0); |
| 101 | |
| 102 | base::EmbeddedVector<char, 128> name_buffer; |
| 103 | for (uint32_t i = 0; i < field_count; i++) { |
| 104 | // TODO(ishell): consider introducing a cache of first N internalized field |
| 105 | // names similar to LookupSingleCharacterStringFromCode(). |
| 106 | SNPrintF(name_buffer, "$field%d", i); |
| 107 | Handle<String> name = |
| 108 | isolate->factory()->InternalizeUtf8String(name_buffer.begin()); |
| 109 | |
| 110 | PropertyAttributes attributes = type->mutability(i) ? SEALED : FROZEN; |
| 111 | PropertyDetails details( |
| 112 | PropertyKind::kData, attributes, PropertyLocation::kField, |
| 113 | PropertyConstness::kMutable, // Don't track constness |
| 114 | Representation::WasmValue(), static_cast<int>(i)); |
| 115 | descriptors->Set(InternalIndex(i), *name, any_type, details); |
| 116 | } |
| 117 | descriptors->Sort(); |
| 118 | return descriptors; |
| 119 | } |
| 120 | |
| 121 | Handle<DescriptorArray> CreateArrayDescriptorArray( |
| 122 | Isolate* isolate, const wasm::ArrayType* type) { |
| 123 | uint32_t kDescriptorsCount = 1; |
| 124 | Handle<DescriptorArray> descriptors = |
| 125 | isolate->factory()->NewDescriptorArray(kDescriptorsCount); |
| 126 | |
| 127 | // TODO(ishell): cache Wasm field type in FieldType value. |
| 128 | MaybeObject any_type = MaybeObject::FromObject(FieldType::Any()); |
| 129 | DCHECK(any_type->IsSmi())((void) 0); |
| 130 | |
| 131 | // Add descriptor for length property. |
| 132 | PropertyDetails details(PropertyKind::kData, FROZEN, PropertyLocation::kField, |
| 133 | PropertyConstness::kConst, |
| 134 | Representation::WasmValue(), static_cast<int>(0)); |
| 135 | descriptors->Set(InternalIndex(0), *isolate->factory()->length_string(), |
| 136 | any_type, details); |
| 137 | |
| 138 | descriptors->Sort(); |
| 139 | return descriptors; |
| 140 | } |
| 141 | |
| 142 | Handle<Map> CreateStructMap(Isolate* isolate, const WasmModule* module, |
| 143 | int struct_index, Handle<Map> opt_rtt_parent, |
| 144 | Handle<WasmInstanceObject> instance) { |
| 145 | const wasm::StructType* type = module->struct_type(struct_index); |
| 146 | const int inobject_properties = 0; |
| 147 | // We have to use the variable size sentinel because the instance size |
| 148 | // stored directly in a Map is capped at 255 pointer sizes. |
| 149 | const int map_instance_size = kVariableSizeSentinel; |
| 150 | const int real_instance_size = WasmStruct::Size(type); |
| 151 | const InstanceType instance_type = WASM_STRUCT_TYPE; |
| 152 | // TODO(jkummerow): If NO_ELEMENTS were supported, we could use that here. |
| 153 | const ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND; |
| 154 | Handle<WasmTypeInfo> type_info = isolate->factory()->NewWasmTypeInfo( |
| 155 | reinterpret_cast<Address>(type), opt_rtt_parent, real_instance_size, |
| 156 | instance); |
| 157 | Handle<DescriptorArray> descriptors = |
| 158 | CreateStructDescriptorArray(isolate, type); |
| 159 | Handle<Map> map = isolate->factory()->NewMap( |
| 160 | instance_type, map_instance_size, elements_kind, inobject_properties); |
| 161 | map->set_wasm_type_info(*type_info); |
| 162 | map->SetInstanceDescriptors(isolate, *descriptors, |
| 163 | descriptors->number_of_descriptors()); |
| 164 | map->set_is_extensible(false); |
| 165 | WasmStruct::EncodeInstanceSizeInMap(real_instance_size, *map); |
| 166 | return map; |
| 167 | } |
| 168 | |
| 169 | Handle<Map> CreateArrayMap(Isolate* isolate, const WasmModule* module, |
| 170 | int array_index, Handle<Map> opt_rtt_parent, |
| 171 | Handle<WasmInstanceObject> instance) { |
| 172 | const wasm::ArrayType* type = module->array_type(array_index); |
| 173 | const int inobject_properties = 0; |
| 174 | const int instance_size = kVariableSizeSentinel; |
| 175 | // Wasm Arrays don't have a static instance size. |
| 176 | const int cached_instance_size = 0; |
| 177 | const InstanceType instance_type = WASM_ARRAY_TYPE; |
| 178 | const ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND; |
| 179 | Handle<WasmTypeInfo> type_info = isolate->factory()->NewWasmTypeInfo( |
| 180 | reinterpret_cast<Address>(type), opt_rtt_parent, cached_instance_size, |
| 181 | instance); |
| 182 | // TODO(ishell): get canonical descriptor array for WasmArrays from roots. |
| 183 | Handle<DescriptorArray> descriptors = |
| 184 | CreateArrayDescriptorArray(isolate, type); |
| 185 | Handle<Map> map = isolate->factory()->NewMap( |
| 186 | instance_type, instance_size, elements_kind, inobject_properties); |
| 187 | map->set_wasm_type_info(*type_info); |
| 188 | map->SetInstanceDescriptors(isolate, *descriptors, |
| 189 | descriptors->number_of_descriptors()); |
| 190 | map->set_is_extensible(false); |
| 191 | WasmArray::EncodeElementSizeInMap(type->element_type().value_kind_size(), |
| 192 | *map); |
| 193 | return map; |
| 194 | } |
| 195 | |
| 196 | Handle<Map> CreateFuncRefMap(Isolate* isolate, const WasmModule* module, |
| 197 | Handle<Map> opt_rtt_parent, |
| 198 | Handle<WasmInstanceObject> instance) { |
| 199 | const int inobject_properties = 0; |
| 200 | const int instance_size = |
| 201 | Map::cast(isolate->root(RootIndex::kWasmInternalFunctionMap)) |
| 202 | .instance_size(); |
| 203 | const InstanceType instance_type = WASM_INTERNAL_FUNCTION_TYPE; |
| 204 | const ElementsKind elements_kind = TERMINAL_FAST_ELEMENTS_KIND; |
| 205 | Handle<WasmTypeInfo> type_info = isolate->factory()->NewWasmTypeInfo( |
| 206 | kNullAddress, opt_rtt_parent, instance_size, instance); |
| 207 | Handle<Map> map = isolate->factory()->NewMap( |
| 208 | instance_type, instance_size, elements_kind, inobject_properties); |
| 209 | map->set_wasm_type_info(*type_info); |
| 210 | return map; |
| 211 | } |
| 212 | |
| 213 | void CreateMapForType(Isolate* isolate, const WasmModule* module, |
| 214 | int type_index, Handle<WasmInstanceObject> instance, |
| 215 | Handle<FixedArray> maps) { |
| 216 | // Recursive calls for supertypes may already have created this map. |
| 217 | if (maps->get(type_index).IsMap()) return; |
| 218 | |
| 219 | Handle<WeakArrayList> canonical_rtts; |
| 220 | uint32_t canonical_type_index = |
| 221 | module->isorecursive_canonical_type_ids[type_index]; |
| 222 | |
| 223 | if (FLAG_wasm_type_canonicalization) { |
| 224 | // Try to find the canonical map for this type in the isolate store. |
| 225 | canonical_rtts = handle(isolate->heap()->wasm_canonical_rtts(), isolate); |
| 226 | DCHECK_GT(static_cast<uint32_t>(canonical_rtts->length()),((void) 0) |
| 227 | canonical_type_index)((void) 0); |
| 228 | MaybeObject maybe_canonical_map = canonical_rtts->Get(canonical_type_index); |
| 229 | if (maybe_canonical_map.IsStrongOrWeak() && |
| 230 | maybe_canonical_map.GetHeapObject().IsMap()) { |
| 231 | maps->set(type_index, maybe_canonical_map.GetHeapObject()); |
| 232 | return; |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | Handle<Map> rtt_parent; |
| 237 | // If the type with {type_index} has an explicit supertype, make sure the |
| 238 | // map for that supertype is created first, so that the supertypes list |
| 239 | // that's cached on every RTT can be set up correctly. |
| 240 | uint32_t supertype = module->supertype(type_index); |
| 241 | if (supertype != kNoSuperType) { |
| 242 | // This recursion is safe, because kV8MaxRttSubtypingDepth limits the |
| 243 | // number of recursive steps, so we won't overflow the stack. |
| 244 | CreateMapForType(isolate, module, supertype, instance, maps); |
| 245 | rtt_parent = handle(Map::cast(maps->get(supertype)), isolate); |
| 246 | } |
| 247 | Handle<Map> map; |
| 248 | switch (module->types[type_index].kind) { |
| 249 | case TypeDefinition::kStruct: |
| 250 | map = CreateStructMap(isolate, module, type_index, rtt_parent, instance); |
| 251 | break; |
| 252 | case TypeDefinition::kArray: |
| 253 | map = CreateArrayMap(isolate, module, type_index, rtt_parent, instance); |
| 254 | break; |
| 255 | case TypeDefinition::kFunction: |
| 256 | map = CreateFuncRefMap(isolate, module, rtt_parent, instance); |
| 257 | break; |
| 258 | } |
| 259 | if (FLAG_wasm_type_canonicalization) { |
| 260 | canonical_rtts->Set(canonical_type_index, HeapObjectReference::Weak(*map)); |
| 261 | } |
| 262 | maps->set(type_index, *map); |
| 263 | } |
| 264 | |
| 265 | } // namespace |
| 266 | |
| 267 | // A helper class to simplify instantiating a module from a module object. |
| 268 | // It closes over the {Isolate}, the {ErrorThrower}, etc. |
| 269 | class InstanceBuilder { |
| 270 | public: |
| 271 | InstanceBuilder(Isolate* isolate, v8::metrics::Recorder::ContextId context_id, |
| 272 | ErrorThrower* thrower, Handle<WasmModuleObject> module_object, |
| 273 | MaybeHandle<JSReceiver> ffi, |
| 274 | MaybeHandle<JSArrayBuffer> memory_buffer); |
| 275 | |
| 276 | // Build an instance, in all of its glory. |
| 277 | MaybeHandle<WasmInstanceObject> Build(); |
| 278 | // Run the start function, if any. |
| 279 | bool ExecuteStartFunction(); |
| 280 | |
| 281 | private: |
| 282 | // A pre-evaluated value to use in import binding. |
| 283 | struct SanitizedImport { |
| 284 | Handle<String> module_name; |
| 285 | Handle<String> import_name; |
| 286 | Handle<Object> value; |
| 287 | }; |
| 288 | |
| 289 | Isolate* isolate_; |
| 290 | v8::metrics::Recorder::ContextId context_id_; |
| 291 | const WasmFeatures enabled_; |
| 292 | const WasmModule* const module_; |
| 293 | ErrorThrower* thrower_; |
| 294 | Handle<WasmModuleObject> module_object_; |
| 295 | MaybeHandle<JSReceiver> ffi_; |
| 296 | MaybeHandle<JSArrayBuffer> memory_buffer_; |
| 297 | Handle<WasmMemoryObject> memory_object_; |
| 298 | Handle<JSArrayBuffer> untagged_globals_; |
| 299 | Handle<FixedArray> tagged_globals_; |
| 300 | std::vector<Handle<WasmTagObject>> tags_wrappers_; |
| 301 | Handle<WasmExportedFunction> start_function_; |
| 302 | std::vector<SanitizedImport> sanitized_imports_; |
| 303 | // We pass this {Zone} to the temporary {WasmFullDecoder} we allocate during |
| 304 | // each call to {EvaluateInitExpression}. This has been found to improve |
| 305 | // performance a bit over allocating a new {Zone} each time. |
| 306 | Zone init_expr_zone_; |
| 307 | |
| 308 | // Helper routines to print out errors with imports. |
| 309 | #define ERROR_THROWER_WITH_MESSAGE(TYPE) \ |
| 310 | void Report##TYPE(const char* error, uint32_t index, \ |
| 311 | Handle<String> module_name, Handle<String> import_name) { \ |
| 312 | thrower_->TYPE("Import #%d module=\"%s\" function=\"%s\" error: %s", \ |
| 313 | index, module_name->ToCString().get(), \ |
| 314 | import_name->ToCString().get(), error); \ |
| 315 | } \ |
| 316 | \ |
| 317 | MaybeHandle<Object> Report##TYPE(const char* error, uint32_t index, \ |
| 318 | Handle<String> module_name) { \ |
| 319 | thrower_->TYPE("Import #%d module=\"%s\" error: %s", index, \ |
| 320 | module_name->ToCString().get(), error); \ |
| 321 | return MaybeHandle<Object>(); \ |
| 322 | } |
| 323 | |
| 324 | ERROR_THROWER_WITH_MESSAGE(LinkError) |
| 325 | ERROR_THROWER_WITH_MESSAGE(TypeError) |
| 326 | |
| 327 | #undef ERROR_THROWER_WITH_MESSAGE |
| 328 | |
| 329 | // Look up an import value in the {ffi_} object. |
| 330 | MaybeHandle<Object> LookupImport(uint32_t index, Handle<String> module_name, |
| 331 | Handle<String> import_name); |
| 332 | |
| 333 | // Look up an import value in the {ffi_} object specifically for linking an |
| 334 | // asm.js module. This only performs non-observable lookups, which allows |
| 335 | // falling back to JavaScript proper (and hence re-executing all lookups) if |
| 336 | // module instantiation fails. |
| 337 | MaybeHandle<Object> LookupImportAsm(uint32_t index, |
| 338 | Handle<String> import_name); |
| 339 | |
| 340 | // Load data segments into the memory. |
| 341 | void LoadDataSegments(Handle<WasmInstanceObject> instance); |
| 342 | |
| 343 | void WriteGlobalValue(const WasmGlobal& global, const WasmValue& value); |
| 344 | |
| 345 | void SanitizeImports(); |
| 346 | |
| 347 | // Find the imported memory if there is one. |
| 348 | bool FindImportedMemory(); |
| 349 | |
| 350 | // Allocate the memory. |
| 351 | bool AllocateMemory(); |
| 352 | |
| 353 | // Processes a single imported function. |
| 354 | bool ProcessImportedFunction(Handle<WasmInstanceObject> instance, |
| 355 | int import_index, int func_index, |
| 356 | Handle<String> module_name, |
| 357 | Handle<String> import_name, |
| 358 | Handle<Object> value); |
| 359 | |
| 360 | // Initialize imported tables of type funcref. |
| 361 | bool InitializeImportedIndirectFunctionTable( |
| 362 | Handle<WasmInstanceObject> instance, int table_index, int import_index, |
| 363 | Handle<WasmTableObject> table_object); |
| 364 | |
| 365 | // Process a single imported table. |
| 366 | bool ProcessImportedTable(Handle<WasmInstanceObject> instance, |
| 367 | int import_index, int table_index, |
| 368 | Handle<String> module_name, |
| 369 | Handle<String> import_name, Handle<Object> value); |
| 370 | |
| 371 | // Process a single imported memory. |
| 372 | bool ProcessImportedMemory(Handle<WasmInstanceObject> instance, |
| 373 | int import_index, Handle<String> module_name, |
| 374 | Handle<String> import_name, Handle<Object> value); |
| 375 | |
| 376 | // Process a single imported global. |
| 377 | bool ProcessImportedGlobal(Handle<WasmInstanceObject> instance, |
| 378 | int import_index, int global_index, |
| 379 | Handle<String> module_name, |
| 380 | Handle<String> import_name, Handle<Object> value); |
| 381 | |
| 382 | // Process a single imported WasmGlobalObject. |
| 383 | bool ProcessImportedWasmGlobalObject(Handle<WasmInstanceObject> instance, |
| 384 | int import_index, |
| 385 | Handle<String> module_name, |
| 386 | Handle<String> import_name, |
| 387 | const WasmGlobal& global, |
| 388 | Handle<WasmGlobalObject> global_object); |
| 389 | |
| 390 | // Compile import wrappers in parallel. The result goes into the native |
| 391 | // module's import_wrapper_cache. |
| 392 | void CompileImportWrappers(Handle<WasmInstanceObject> instance); |
| 393 | |
| 394 | // Process the imports, including functions, tables, globals, and memory, in |
| 395 | // order, loading them from the {ffi_} object. Returns the number of imported |
| 396 | // functions, or {-1} on error. |
| 397 | int ProcessImports(Handle<WasmInstanceObject> instance); |
| 398 | |
| 399 | template <typename T> |
| 400 | T* GetRawUntaggedGlobalPtr(const WasmGlobal& global); |
| 401 | |
| 402 | // Process initialization of globals. |
| 403 | void InitGlobals(Handle<WasmInstanceObject> instance); |
| 404 | |
| 405 | // Process the exports, creating wrappers for functions, tables, memories, |
| 406 | // and globals. |
| 407 | void ProcessExports(Handle<WasmInstanceObject> instance); |
| 408 | |
| 409 | void InitializeNonDefaultableTables(Handle<WasmInstanceObject> instance); |
| 410 | |
| 411 | void LoadTableSegments(Handle<WasmInstanceObject> instance); |
| 412 | |
| 413 | // Creates new tags. Note that some tags might already exist if they were |
| 414 | // imported, those tags will be re-used. |
| 415 | void InitializeTags(Handle<WasmInstanceObject> instance); |
| 416 | }; |
| 417 | |
| 418 | MaybeHandle<WasmInstanceObject> InstantiateToInstanceObject( |
| 419 | Isolate* isolate, ErrorThrower* thrower, |
| 420 | Handle<WasmModuleObject> module_object, MaybeHandle<JSReceiver> imports, |
| 421 | MaybeHandle<JSArrayBuffer> memory_buffer) { |
| 422 | v8::metrics::Recorder::ContextId context_id = |
| 423 | isolate->GetOrRegisterRecorderContextId(isolate->native_context()); |
| 424 | InstanceBuilder builder(isolate, context_id, thrower, module_object, imports, |
| 425 | memory_buffer); |
| 426 | auto instance = builder.Build(); |
| 427 | if (!instance.is_null() && builder.ExecuteStartFunction()) { |
| 428 | return instance; |
| 429 | } |
| 430 | DCHECK(isolate->has_pending_exception() || thrower->error())((void) 0); |
| 431 | return {}; |
| 432 | } |
| 433 | |
| 434 | InstanceBuilder::InstanceBuilder(Isolate* isolate, |
| 435 | v8::metrics::Recorder::ContextId context_id, |
| 436 | ErrorThrower* thrower, |
| 437 | Handle<WasmModuleObject> module_object, |
| 438 | MaybeHandle<JSReceiver> ffi, |
| 439 | MaybeHandle<JSArrayBuffer> memory_buffer) |
| 440 | : isolate_(isolate), |
| 441 | context_id_(context_id), |
| 442 | enabled_(module_object->native_module()->enabled_features()), |
| 443 | module_(module_object->module()), |
| 444 | thrower_(thrower), |
| 445 | module_object_(module_object), |
| 446 | ffi_(ffi), |
| 447 | memory_buffer_(memory_buffer), |
| 448 | init_expr_zone_(isolate_->allocator(), "init. expression zone") { |
| 449 | sanitized_imports_.reserve(module_->import_table.size()); |
| 450 | } |
| 451 | |
| 452 | // Build an instance, in all of its glory. |
| 453 | MaybeHandle<WasmInstanceObject> InstanceBuilder::Build() { |
| 454 | TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm.detailed"),static v8::base::AtomicWord trace_event_unique_atomic455 = 0; const uint8_t* trace_event_unique_category_group_enabled455; trace_event_unique_category_group_enabled455 = reinterpret_cast <const uint8_t*>(v8::base::Relaxed_Load(&(trace_event_unique_atomic455 ))); if (!trace_event_unique_category_group_enabled455) { trace_event_unique_category_group_enabled455 = v8::internal::tracing::TraceEventHelper::GetTracingController () ->GetCategoryGroupEnabled("disabled-by-default-" "v8.wasm.detailed" ); v8::base::Relaxed_Store(&(trace_event_unique_atomic455 ), (reinterpret_cast<v8::base::AtomicWord>( trace_event_unique_category_group_enabled455 ))); };; v8::internal::tracing::ScopedTracer trace_event_unique_tracer455 ; if (v8::base::Relaxed_Load(reinterpret_cast<const v8::base ::Atomic8*>( trace_event_unique_category_group_enabled455) ) & (kEnabledForRecording_CategoryGroupEnabledFlags | kEnabledForEventCallback_CategoryGroupEnabledFlags )) { uint64_t h = v8::internal::tracing::AddTraceEvent( ('X') , trace_event_unique_category_group_enabled455, "wasm.InstanceBuilder.Build" , v8::internal::tracing::kGlobalScope, v8::internal::tracing:: kNoId, v8::internal::tracing::kNoId, (static_cast<unsigned int>(0))); trace_event_unique_tracer455 .Initialize(trace_event_unique_category_group_enabled455 , "wasm.InstanceBuilder.Build", h); } |
| 455 | "wasm.InstanceBuilder.Build")static v8::base::AtomicWord trace_event_unique_atomic455 = 0; const uint8_t* trace_event_unique_category_group_enabled455; trace_event_unique_category_group_enabled455 = reinterpret_cast <const uint8_t*>(v8::base::Relaxed_Load(&(trace_event_unique_atomic455 ))); if (!trace_event_unique_category_group_enabled455) { trace_event_unique_category_group_enabled455 = v8::internal::tracing::TraceEventHelper::GetTracingController () ->GetCategoryGroupEnabled("disabled-by-default-" "v8.wasm.detailed" ); v8::base::Relaxed_Store(&(trace_event_unique_atomic455 ), (reinterpret_cast<v8::base::AtomicWord>( trace_event_unique_category_group_enabled455 ))); };; v8::internal::tracing::ScopedTracer trace_event_unique_tracer455 ; if (v8::base::Relaxed_Load(reinterpret_cast<const v8::base ::Atomic8*>( trace_event_unique_category_group_enabled455) ) & (kEnabledForRecording_CategoryGroupEnabledFlags | kEnabledForEventCallback_CategoryGroupEnabledFlags )) { uint64_t h = v8::internal::tracing::AddTraceEvent( ('X') , trace_event_unique_category_group_enabled455, "wasm.InstanceBuilder.Build" , v8::internal::tracing::kGlobalScope, v8::internal::tracing:: kNoId, v8::internal::tracing::kNoId, (static_cast<unsigned int>(0))); trace_event_unique_tracer455 .Initialize(trace_event_unique_category_group_enabled455 , "wasm.InstanceBuilder.Build", h); }; |
| 456 | // Check that an imports argument was provided, if the module requires it. |
| 457 | // No point in continuing otherwise. |
| 458 | if (!module_->import_table.empty() && ffi_.is_null()) { |
| 459 | thrower_->TypeError( |
| 460 | "Imports argument must be present and must be an object"); |
| 461 | return {}; |
| 462 | } |
| 463 | |
| 464 | SanitizeImports(); |
| 465 | if (thrower_->error()) return {}; |
| 466 | |
| 467 | // From here on, we expect the build pipeline to run without exiting to JS. |
| 468 | DisallowJavascriptExecution no_js(isolate_); |
| 469 | // Record build time into correct bucket, then build instance. |
| 470 | TimedHistogramScope wasm_instantiate_module_time_scope(SELECT_WASM_COUNTER(((module_->origin) == kWasmOrigin ? (isolate_->counters ())->wasm_instantiate_wasm_module_time() : (isolate_->counters ())->wasm_instantiate_asm_module_time()) |
| 471 | isolate_->counters(), module_->origin, wasm_instantiate, module_time)((module_->origin) == kWasmOrigin ? (isolate_->counters ())->wasm_instantiate_wasm_module_time() : (isolate_->counters ())->wasm_instantiate_asm_module_time())); |
| 472 | v8::metrics::WasmModuleInstantiated wasm_module_instantiated; |
| 473 | base::ElapsedTimer timer; |
| 474 | timer.Start(); |
| 475 | NativeModule* native_module = module_object_->native_module(); |
Value stored to 'native_module' during its initialization is never read | |
| 476 | |
| 477 | //-------------------------------------------------------------------------- |
| 478 | // Set up the memory buffer and memory objects. |
| 479 | //-------------------------------------------------------------------------- |
| 480 | uint32_t initial_pages = module_->initial_pages; |
| 481 | auto initial_pages_counter = SELECT_WASM_COUNTER(((module_->origin) == kWasmOrigin ? (isolate_->counters ())->wasm_wasm_min_mem_pages_count() : (isolate_->counters ())->wasm_asm_min_mem_pages_count()) |
| 482 | isolate_->counters(), module_->origin, wasm, min_mem_pages_count)((module_->origin) == kWasmOrigin ? (isolate_->counters ())->wasm_wasm_min_mem_pages_count() : (isolate_->counters ())->wasm_asm_min_mem_pages_count()); |
| 483 | initial_pages_counter->AddSample(initial_pages); |
| 484 | if (module_->has_maximum_pages) { |
| 485 | DCHECK_EQ(kWasmOrigin, module_->origin)((void) 0); |
| 486 | auto max_pages_counter = |
| 487 | isolate_->counters()->wasm_wasm_max_mem_pages_count(); |
| 488 | max_pages_counter->AddSample(module_->maximum_pages); |
| 489 | } |
| 490 | |
| 491 | if (is_asmjs_module(module_)) { |
| 492 | Handle<JSArrayBuffer> buffer; |
| 493 | if (memory_buffer_.ToHandle(&buffer)) { |
| 494 | // asm.js instantiation should have changed the state of the buffer. |
| 495 | CHECK(!buffer->is_detachable())do { if ((__builtin_expect(!!(!(!buffer->is_detachable())) , 0))) { V8_Fatal("Check failed: %s.", "!buffer->is_detachable()" ); } } while (false); |
| 496 | CHECK(buffer->is_asmjs_memory())do { if ((__builtin_expect(!!(!(buffer->is_asmjs_memory()) ), 0))) { V8_Fatal("Check failed: %s.", "buffer->is_asmjs_memory()" ); } } while (false); |
| 497 | } else { |
| 498 | // Use an empty JSArrayBuffer for degenerate asm.js modules. |
| 499 | memory_buffer_ = isolate_->factory()->NewJSArrayBufferAndBackingStore( |
| 500 | 0, InitializedFlag::kUninitialized); |
| 501 | if (!memory_buffer_.ToHandle(&buffer)) { |
| 502 | thrower_->RangeError("Out of memory: asm.js memory"); |
| 503 | return {}; |
| 504 | } |
| 505 | buffer->set_is_asmjs_memory(true); |
| 506 | buffer->set_is_detachable(false); |
| 507 | } |
| 508 | |
| 509 | // The maximum number of pages isn't strictly necessary for memory |
| 510 | // objects used for asm.js, as they are never visible, but we might |
| 511 | // as well make it accurate. |
| 512 | auto maximum_pages = |
| 513 | static_cast<int>(RoundUp(buffer->byte_length(), wasm::kWasmPageSize) / |
| 514 | wasm::kWasmPageSize); |
| 515 | memory_object_ = |
| 516 | WasmMemoryObject::New(isolate_, memory_buffer_, maximum_pages) |
| 517 | .ToHandleChecked(); |
| 518 | } else { |
| 519 | // Actual wasm module must have either imported or created memory. |
| 520 | CHECK(memory_buffer_.is_null())do { if ((__builtin_expect(!!(!(memory_buffer_.is_null())), 0 ))) { V8_Fatal("Check failed: %s.", "memory_buffer_.is_null()" ); } } while (false); |
| 521 | if (!FindImportedMemory()) { |
| 522 | if (module_->has_memory && !AllocateMemory()) { |
| 523 | DCHECK(isolate_->has_pending_exception() || thrower_->error())((void) 0); |
| 524 | return {}; |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | //-------------------------------------------------------------------------- |
| 530 | // Create the WebAssembly.Instance object. |
| 531 | //-------------------------------------------------------------------------- |
| 532 | TRACE("New module instantiation for %p\n", native_module); |
| 533 | Handle<WasmInstanceObject> instance = |
| 534 | WasmInstanceObject::New(isolate_, module_object_); |
| 535 | |
| 536 | //-------------------------------------------------------------------------- |
| 537 | // Attach the memory to the instance. |
| 538 | //-------------------------------------------------------------------------- |
| 539 | if (module_->has_memory) { |
| 540 | DCHECK(!memory_object_.is_null())((void) 0); |
| 541 | if (!instance->has_memory_object()) { |
| 542 | instance->set_memory_object(*memory_object_); |
| 543 | } |
| 544 | // Add the instance object to the list of instances for this memory. |
| 545 | WasmMemoryObject::AddInstance(isolate_, memory_object_, instance); |
| 546 | |
| 547 | // Double-check the {memory} array buffer matches the instance. |
| 548 | Handle<JSArrayBuffer> memory = memory_buffer_.ToHandleChecked(); |
| 549 | CHECK_EQ(instance->memory_size(), memory->byte_length())do { bool _cmp = ::v8::base::CmpEQImpl< typename ::v8::base ::pass_value_or_ref<decltype(instance->memory_size())> ::type, typename ::v8::base::pass_value_or_ref<decltype(memory ->byte_length())>::type>((instance->memory_size() ), (memory->byte_length())); do { if ((__builtin_expect(!! (!(_cmp)), 0))) { V8_Fatal("Check failed: %s.", "instance->memory_size()" " " "==" " " "memory->byte_length()"); } } while (false); } while (false); |
| 550 | CHECK_EQ(instance->memory_start(), memory->backing_store())do { bool _cmp = ::v8::base::CmpEQImpl< typename ::v8::base ::pass_value_or_ref<decltype(instance->memory_start())> ::type, typename ::v8::base::pass_value_or_ref<decltype(memory ->backing_store())>::type>((instance->memory_start ()), (memory->backing_store())); do { if ((__builtin_expect (!!(!(_cmp)), 0))) { V8_Fatal("Check failed: %s.", "instance->memory_start()" " " "==" " " "memory->backing_store()"); } } while (false ); } while (false); |
| 551 | } |
| 552 | |
| 553 | //-------------------------------------------------------------------------- |
| 554 | // Set up the globals for the new instance. |
| 555 | //-------------------------------------------------------------------------- |
| 556 | uint32_t untagged_globals_buffer_size = module_->untagged_globals_buffer_size; |
| 557 | if (untagged_globals_buffer_size > 0) { |
| 558 | MaybeHandle<JSArrayBuffer> result = |
| 559 | isolate_->factory()->NewJSArrayBufferAndBackingStore( |
| 560 | untagged_globals_buffer_size, InitializedFlag::kZeroInitialized, |
| 561 | AllocationType::kOld); |
| 562 | |
| 563 | if (!result.ToHandle(&untagged_globals_)) { |
| 564 | thrower_->RangeError("Out of memory: wasm globals"); |
| 565 | return {}; |
| 566 | } |
| 567 | |
| 568 | instance->set_untagged_globals_buffer(*untagged_globals_); |
| 569 | instance->set_globals_start( |
| 570 | reinterpret_cast<byte*>(untagged_globals_->backing_store())); |
| 571 | } |
| 572 | |
| 573 | uint32_t tagged_globals_buffer_size = module_->tagged_globals_buffer_size; |
| 574 | if (tagged_globals_buffer_size > 0) { |
| 575 | tagged_globals_ = isolate_->factory()->NewFixedArray( |
| 576 | static_cast<int>(tagged_globals_buffer_size)); |
| 577 | instance->set_tagged_globals_buffer(*tagged_globals_); |
| 578 | } |
| 579 | |
| 580 | //-------------------------------------------------------------------------- |
| 581 | // Set up the array of references to imported globals' array buffers. |
| 582 | //-------------------------------------------------------------------------- |
| 583 | if (module_->num_imported_mutable_globals > 0) { |
| 584 | // TODO(binji): This allocates one slot for each mutable global, which is |
| 585 | // more than required if multiple globals are imported from the same |
| 586 | // module. |
| 587 | Handle<FixedArray> buffers_array = isolate_->factory()->NewFixedArray( |
| 588 | module_->num_imported_mutable_globals, AllocationType::kOld); |
| 589 | instance->set_imported_mutable_globals_buffers(*buffers_array); |
| 590 | } |
| 591 | |
| 592 | //-------------------------------------------------------------------------- |
| 593 | // Set up the tag table used for exception tag checks. |
| 594 | //-------------------------------------------------------------------------- |
| 595 | int tags_count = static_cast<int>(module_->tags.size()); |
| 596 | if (tags_count > 0) { |
| 597 | Handle<FixedArray> tag_table = |
| 598 | isolate_->factory()->NewFixedArray(tags_count, AllocationType::kOld); |
| 599 | instance->set_tags_table(*tag_table); |
| 600 | tags_wrappers_.resize(tags_count); |
| 601 | } |
| 602 | |
| 603 | //-------------------------------------------------------------------------- |
| 604 | // Set up table storage space. |
| 605 | //-------------------------------------------------------------------------- |
| 606 | int table_count = static_cast<int>(module_->tables.size()); |
| 607 | { |
| 608 | for (int i = 0; i < table_count; i++) { |
| 609 | const WasmTable& table = module_->tables[i]; |
| 610 | if (table.initial_size > FLAG_wasm_max_table_size) { |
| 611 | thrower_->RangeError( |
| 612 | "initial table size (%u elements) is larger than implementation " |
| 613 | "limit (%u elements)", |
| 614 | table.initial_size, FLAG_wasm_max_table_size); |
| 615 | return {}; |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | Handle<FixedArray> tables = isolate_->factory()->NewFixedArray(table_count); |
| 620 | for (int i = module_->num_imported_tables; i < table_count; i++) { |
| 621 | const WasmTable& table = module_->tables[i]; |
| 622 | // Initialize tables with null for now. We will initialize non-defaultable |
| 623 | // tables later, in {InitializeNonDefaultableTables}. |
| 624 | Handle<WasmTableObject> table_obj = WasmTableObject::New( |
| 625 | isolate_, instance, table.type, table.initial_size, |
| 626 | table.has_maximum_size, table.maximum_size, nullptr, |
| 627 | isolate_->factory()->null_value()); |
| 628 | tables->set(i, *table_obj); |
| 629 | } |
| 630 | instance->set_tables(*tables); |
| 631 | } |
| 632 | |
| 633 | { |
| 634 | Handle<FixedArray> tables = isolate_->factory()->NewFixedArray(table_count); |
| 635 | for (int i = 0; i < table_count; ++i) { |
| 636 | const WasmTable& table = module_->tables[i]; |
| 637 | if (IsSubtypeOf(table.type, kWasmFuncRef, module_)) { |
| 638 | Handle<WasmIndirectFunctionTable> table_obj = |
| 639 | WasmIndirectFunctionTable::New(isolate_, table.initial_size); |
| 640 | tables->set(i, *table_obj); |
| 641 | } |
| 642 | } |
| 643 | instance->set_indirect_function_tables(*tables); |
| 644 | } |
| 645 | |
| 646 | instance->SetIndirectFunctionTableShortcuts(isolate_); |
| 647 | |
| 648 | //-------------------------------------------------------------------------- |
| 649 | // Process the imports for the module. |
| 650 | //-------------------------------------------------------------------------- |
| 651 | if (!module_->import_table.empty()) { |
| 652 | int num_imported_functions = ProcessImports(instance); |
| 653 | if (num_imported_functions < 0) return {}; |
| 654 | wasm_module_instantiated.imported_function_count = num_imported_functions; |
| 655 | } |
| 656 | |
| 657 | //-------------------------------------------------------------------------- |
| 658 | // Create maps for managed objects (GC proposal). |
| 659 | // Must happen before {InitGlobals} because globals can refer to these maps. |
| 660 | // We do not need to cache the canonical rtts to (rtt.canon any)'s subtype |
| 661 | // list. |
| 662 | //-------------------------------------------------------------------------- |
| 663 | if (enabled_.has_gc()) { |
| 664 | if (FLAG_wasm_type_canonicalization) { |
| 665 | uint32_t maximum_canonical_type_index = |
| 666 | *std::max_element(module_->isorecursive_canonical_type_ids.begin(), |
| 667 | module_->isorecursive_canonical_type_ids.end()); |
| 668 | // Make sure all canonical indices have been set. |
| 669 | DCHECK_NE(maximum_canonical_type_index, kNoSuperType)((void) 0); |
| 670 | isolate_->heap()->EnsureWasmCanonicalRttsSize( |
| 671 | maximum_canonical_type_index + 1); |
| 672 | } |
| 673 | Handle<FixedArray> maps = isolate_->factory()->NewFixedArray( |
| 674 | static_cast<int>(module_->types.size())); |
| 675 | for (uint32_t index = 0; index < module_->types.size(); index++) { |
| 676 | CreateMapForType(isolate_, module_, index, instance, maps); |
| 677 | } |
| 678 | instance->set_managed_object_maps(*maps); |
| 679 | } |
| 680 | |
| 681 | //-------------------------------------------------------------------------- |
| 682 | // Allocate type feedback vectors for functions. |
| 683 | //-------------------------------------------------------------------------- |
| 684 | if (FLAG_wasm_speculative_inlining) { |
| 685 | int num_functions = static_cast<int>(module_->num_declared_functions); |
| 686 | Handle<FixedArray> vectors = |
| 687 | isolate_->factory()->NewFixedArray(num_functions, AllocationType::kOld); |
| 688 | instance->set_feedback_vectors(*vectors); |
| 689 | for (int i = 0; i < num_functions; i++) { |
| 690 | int func_index = module_->num_imported_functions + i; |
| 691 | int slots = |
| 692 | base::Relaxed_Load(&module_->functions[func_index].feedback_slots); |
| 693 | if (slots == 0) continue; |
| 694 | if (FLAG_trace_wasm_speculative_inlining) { |
| 695 | PrintF("[Function %d (declared %d): allocating %d feedback slots]\n", |
| 696 | func_index, i, slots); |
| 697 | } |
| 698 | Handle<FixedArray> feedback = |
| 699 | isolate_->factory()->NewFixedArrayWithZeroes(slots); |
| 700 | vectors->set(i, *feedback); |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | //-------------------------------------------------------------------------- |
| 705 | // Process the initialization for the module's globals. |
| 706 | //-------------------------------------------------------------------------- |
| 707 | InitGlobals(instance); |
| 708 | |
| 709 | //-------------------------------------------------------------------------- |
| 710 | // Initialize the indirect function tables and dispatch tables. We do this |
| 711 | // before initializing non-defaultable tables and loading element segments, so |
| 712 | // that indirect function tables in this module are included in the updates |
| 713 | // when we do so. |
| 714 | //-------------------------------------------------------------------------- |
| 715 | for (int table_index = 0; |
| 716 | table_index < static_cast<int>(module_->tables.size()); ++table_index) { |
| 717 | const WasmTable& table = module_->tables[table_index]; |
| 718 | |
| 719 | if (IsSubtypeOf(table.type, kWasmFuncRef, module_)) { |
| 720 | WasmInstanceObject::EnsureIndirectFunctionTableWithMinimumSize( |
| 721 | instance, table_index, table.initial_size); |
| 722 | if (thrower_->error()) return {}; |
| 723 | auto table_object = handle( |
| 724 | WasmTableObject::cast(instance->tables().get(table_index)), isolate_); |
| 725 | WasmTableObject::AddDispatchTable(isolate_, table_object, instance, |
| 726 | table_index); |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | //-------------------------------------------------------------------------- |
| 731 | // Initialize non-defaultable tables. |
| 732 | //-------------------------------------------------------------------------- |
| 733 | if (FLAG_experimental_wasm_typed_funcref) { |
| 734 | InitializeNonDefaultableTables(instance); |
| 735 | } |
| 736 | |
| 737 | //-------------------------------------------------------------------------- |
| 738 | // Initialize the tags table. |
| 739 | //-------------------------------------------------------------------------- |
| 740 | if (tags_count > 0) { |
| 741 | InitializeTags(instance); |
| 742 | } |
| 743 | |
| 744 | //-------------------------------------------------------------------------- |
| 745 | // Set up the exports object for the new instance. |
| 746 | //-------------------------------------------------------------------------- |
| 747 | ProcessExports(instance); |
| 748 | if (thrower_->error()) return {}; |
| 749 | |
| 750 | //-------------------------------------------------------------------------- |
| 751 | // Load element segments into tables. |
| 752 | //-------------------------------------------------------------------------- |
| 753 | if (table_count > 0) { |
| 754 | LoadTableSegments(instance); |
| 755 | if (thrower_->error()) return {}; |
| 756 | } |
| 757 | |
| 758 | //-------------------------------------------------------------------------- |
| 759 | // Initialize the memory by loading data segments. |
| 760 | //-------------------------------------------------------------------------- |
| 761 | if (module_->data_segments.size() > 0) { |
| 762 | LoadDataSegments(instance); |
| 763 | if (thrower_->error()) return {}; |
| 764 | } |
| 765 | |
| 766 | //-------------------------------------------------------------------------- |
| 767 | // Create a wrapper for the start function. |
| 768 | //-------------------------------------------------------------------------- |
| 769 | if (module_->start_function_index >= 0) { |
| 770 | int start_index = module_->start_function_index; |
| 771 | auto& function = module_->functions[start_index]; |
| 772 | Handle<CodeT> wrapper_code = |
| 773 | ToCodeT(JSToWasmWrapperCompilationUnit::CompileJSToWasmWrapper( |
| 774 | isolate_, function.sig, module_, function.imported), |
| 775 | isolate_); |
| 776 | // TODO(clemensb): Don't generate an exported function for the start |
| 777 | // function. Use CWasmEntry instead. |
| 778 | start_function_ = WasmExportedFunction::New( |
| 779 | isolate_, instance, start_index, |
| 780 | static_cast<int>(function.sig->parameter_count()), wrapper_code); |
| 781 | |
| 782 | if (function.imported) { |
| 783 | ImportedFunctionEntry entry(instance, module_->start_function_index); |
| 784 | Object callable = entry.maybe_callable(); |
| 785 | if (callable.IsJSFunction()) { |
| 786 | // If the start function was imported and calls into Blink, we have |
| 787 | // to pretend that the V8 API was used to enter its correct context. |
| 788 | // To get that context to {ExecuteStartFunction} below, we install it |
| 789 | // as the context of the wrapper we just compiled. That's a bit of a |
| 790 | // hack because it's not really the wrapper's context, only its wrapped |
| 791 | // target's context, but the end result is the same, and since the |
| 792 | // start function wrapper doesn't leak, neither does this |
| 793 | // implementation detail. |
| 794 | start_function_->set_context(JSFunction::cast(callable).context()); |
| 795 | } |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | DCHECK(!isolate_->has_pending_exception())((void) 0); |
| 800 | TRACE("Successfully built instance for module %p\n", |
| 801 | module_object_->native_module()); |
| 802 | wasm_module_instantiated.success = true; |
| 803 | wasm_module_instantiated.wall_clock_duration_in_us = |
| 804 | timer.Elapsed().InMicroseconds(); |
| 805 | timer.Stop(); |
| 806 | isolate_->metrics_recorder()->DelayMainThreadEvent(wasm_module_instantiated, |
| 807 | context_id_); |
| 808 | return instance; |
| 809 | } |
| 810 | |
| 811 | bool InstanceBuilder::ExecuteStartFunction() { |
| 812 | TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.wasm.detailed"),static v8::base::AtomicWord trace_event_unique_atomic813 = 0; const uint8_t* trace_event_unique_category_group_enabled813; trace_event_unique_category_group_enabled813 = reinterpret_cast <const uint8_t*>(v8::base::Relaxed_Load(&(trace_event_unique_atomic813 ))); if (!trace_event_unique_category_group_enabled813) { trace_event_unique_category_group_enabled813 = v8::internal::tracing::TraceEventHelper::GetTracingController () ->GetCategoryGroupEnabled("disabled-by-default-" "v8.wasm.detailed" ); v8::base::Relaxed_Store(&(trace_event_unique_atomic813 ), (reinterpret_cast<v8::base::AtomicWord>( trace_event_unique_category_group_enabled813 ))); };; v8::internal::tracing::ScopedTracer trace_event_unique_tracer813 ; if (v8::base::Relaxed_Load(reinterpret_cast<const v8::base ::Atomic8*>( trace_event_unique_category_group_enabled813) ) & (kEnabledForRecording_CategoryGroupEnabledFlags | kEnabledForEventCallback_CategoryGroupEnabledFlags )) { uint64_t h = v8::internal::tracing::AddTraceEvent( ('X') , trace_event_unique_category_group_enabled813, "wasm.ExecuteStartFunction" , v8::internal::tracing::kGlobalScope, v8::internal::tracing:: kNoId, v8::internal::tracing::kNoId, (static_cast<unsigned int>(0))); trace_event_unique_tracer813 .Initialize(trace_event_unique_category_group_enabled813 , "wasm.ExecuteStartFunction", h); } |
| 813 | "wasm.ExecuteStartFunction")static v8::base::AtomicWord trace_event_unique_atomic813 = 0; const uint8_t* trace_event_unique_category_group_enabled813; trace_event_unique_category_group_enabled813 = reinterpret_cast <const uint8_t*>(v8::base::Relaxed_Load(&(trace_event_unique_atomic813 ))); if (!trace_event_unique_category_group_enabled813) { trace_event_unique_category_group_enabled813 = v8::internal::tracing::TraceEventHelper::GetTracingController () ->GetCategoryGroupEnabled("disabled-by-default-" "v8.wasm.detailed" ); v8::base::Relaxed_Store(&(trace_event_unique_atomic813 ), (reinterpret_cast<v8::base::AtomicWord>( trace_event_unique_category_group_enabled813 ))); };; v8::internal::tracing::ScopedTracer trace_event_unique_tracer813 ; if (v8::base::Relaxed_Load(reinterpret_cast<const v8::base ::Atomic8*>( trace_event_unique_category_group_enabled813) ) & (kEnabledForRecording_CategoryGroupEnabledFlags | kEnabledForEventCallback_CategoryGroupEnabledFlags )) { uint64_t h = v8::internal::tracing::AddTraceEvent( ('X') , trace_event_unique_category_group_enabled813, "wasm.ExecuteStartFunction" , v8::internal::tracing::kGlobalScope, v8::internal::tracing:: kNoId, v8::internal::tracing::kNoId, (static_cast<unsigned int>(0))); trace_event_unique_tracer813 .Initialize(trace_event_unique_category_group_enabled813 , "wasm.ExecuteStartFunction", h); }; |
| 814 | if (start_function_.is_null()) return true; // No start function. |
| 815 | |
| 816 | HandleScope scope(isolate_); |
| 817 | // In case the start function calls out to Blink, we have to make sure that |
| 818 | // the correct "entered context" is available. This is the equivalent of |
| 819 | // v8::Context::Enter() and must happen in addition to the function call |
| 820 | // sequence doing the compiled version of "isolate->set_context(...)". |
| 821 | HandleScopeImplementer* hsi = isolate_->handle_scope_implementer(); |
| 822 | hsi->EnterContext(start_function_->native_context()); |
| 823 | |
| 824 | // Call the JS function. |
| 825 | Handle<Object> undefined = isolate_->factory()->undefined_value(); |
| 826 | MaybeHandle<Object> retval = |
| 827 | Execution::Call(isolate_, start_function_, undefined, 0, nullptr); |
| 828 | hsi->LeaveContext(); |
| 829 | |
| 830 | if (retval.is_null()) { |
| 831 | DCHECK(isolate_->has_pending_exception())((void) 0); |
| 832 | return false; |
| 833 | } |
| 834 | return true; |
| 835 | } |
| 836 | |
| 837 | // Look up an import value in the {ffi_} object. |
| 838 | MaybeHandle<Object> InstanceBuilder::LookupImport(uint32_t index, |
| 839 | Handle<String> module_name, |
| 840 | Handle<String> import_name) { |
| 841 | // We pre-validated in the js-api layer that the ffi object is present, and |
| 842 | // a JSObject, if the module has imports. |
| 843 | DCHECK(!ffi_.is_null())((void) 0); |
| 844 | // Look up the module first. |
| 845 | MaybeHandle<Object> result = Object::GetPropertyOrElement( |
| 846 | isolate_, ffi_.ToHandleChecked(), module_name); |
| 847 | if (result.is_null()) { |
| 848 | return ReportTypeError("module not found", index, module_name); |
| 849 | } |
| 850 | |
| 851 | Handle<Object> module = result.ToHandleChecked(); |
| 852 | |
| 853 | // Look up the value in the module. |
| 854 | if (!module->IsJSReceiver()) { |
| 855 | return ReportTypeError("module is not an object or function", index, |
| 856 | module_name); |
| 857 | } |
| 858 | |
| 859 | result = Object::GetPropertyOrElement(isolate_, module, import_name); |
| 860 | if (result.is_null()) { |
| 861 | ReportLinkError("import not found", index, module_name, import_name); |
| 862 | return MaybeHandle<JSFunction>(); |
| 863 | } |
| 864 | |
| 865 | return result; |
| 866 | } |
| 867 | |
| 868 | namespace { |
| 869 | bool HasDefaultToNumberBehaviour(Isolate* isolate, |
| 870 | Handle<JSFunction> function) { |
| 871 | // Disallow providing a [Symbol.toPrimitive] member. |
| 872 | LookupIterator to_primitive_it{isolate, function, |
| 873 | isolate->factory()->to_primitive_symbol()}; |
| 874 | if (to_primitive_it.state() != LookupIterator::NOT_FOUND) return false; |
| 875 | |
| 876 | // The {valueOf} member must be the default "ObjectPrototypeValueOf". |
| 877 | LookupIterator value_of_it{isolate, function, |
| 878 | isolate->factory()->valueOf_string()}; |
| 879 | if (value_of_it.state() != LookupIterator::DATA) return false; |
| 880 | Handle<Object> value_of = value_of_it.GetDataValue(); |
| 881 | if (!value_of->IsJSFunction()) return false; |
| 882 | Builtin value_of_builtin_id = |
| 883 | Handle<JSFunction>::cast(value_of)->code().builtin_id(); |
| 884 | if (value_of_builtin_id != Builtin::kObjectPrototypeValueOf) return false; |
| 885 | |
| 886 | // The {toString} member must be the default "FunctionPrototypeToString". |
| 887 | LookupIterator to_string_it{isolate, function, |
| 888 | isolate->factory()->toString_string()}; |
| 889 | if (to_string_it.state() != LookupIterator::DATA) return false; |
| 890 | Handle<Object> to_string = to_string_it.GetDataValue(); |
| 891 | if (!to_string->IsJSFunction()) return false; |
| 892 | Builtin to_string_builtin_id = |
| 893 | Handle<JSFunction>::cast(to_string)->code().builtin_id(); |
| 894 | if (to_string_builtin_id != Builtin::kFunctionPrototypeToString) return false; |
| 895 | |
| 896 | // Just a default function, which will convert to "Nan". Accept this. |
| 897 | return true; |
| 898 | } |
| 899 | |
| 900 | V8_INLINEinline __attribute__((always_inline)) WasmValue EvaluateInitExpression(Zone* zone, ConstantExpression expr, |
| 901 | ValueType expected, Isolate* isolate, |
| 902 | Handle<WasmInstanceObject> instance, |
| 903 | ErrorThrower* thrower) { |
| 904 | switch (expr.kind()) { |
| 905 | case ConstantExpression::kEmpty: |
| 906 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 907 | case ConstantExpression::kI32Const: |
| 908 | return WasmValue(expr.i32_value()); |
| 909 | case ConstantExpression::kRefNull: |
| 910 | return WasmValue(isolate->factory()->null_value(), |
| 911 | ValueType::Ref(expr.repr(), kNullable)); |
| 912 | case ConstantExpression::kRefFunc: { |
| 913 | uint32_t index = expr.index(); |
| 914 | Handle<Object> value = |
| 915 | WasmInstanceObject::GetOrCreateWasmInternalFunction(isolate, instance, |
| 916 | index); |
| 917 | return WasmValue(value, expected); |
| 918 | } |
| 919 | case ConstantExpression::kWireBytesRef: { |
| 920 | WireBytesRef ref = expr.wire_bytes_ref(); |
| 921 | |
| 922 | base::Vector<const byte> module_bytes = |
| 923 | instance->module_object().native_module()->wire_bytes(); |
| 924 | |
| 925 | const byte* start = module_bytes.begin() + ref.offset(); |
| 926 | const byte* end = module_bytes.begin() + ref.end_offset(); |
| 927 | |
| 928 | auto sig = FixedSizeSignature<ValueType>::Returns(expected); |
| 929 | FunctionBody body(&sig, ref.offset(), start, end); |
| 930 | WasmFeatures detected; |
| 931 | // We use kFullValidation so we do not have to create another template |
| 932 | // instance of WasmFullDecoder, which would cost us >50Kb binary code |
| 933 | // size. |
| 934 | WasmFullDecoder<Decoder::kFullValidation, InitExprInterface, |
| 935 | kInitExpression> |
| 936 | decoder(zone, instance->module(), WasmFeatures::All(), &detected, |
| 937 | body, instance->module(), isolate, instance); |
| 938 | |
| 939 | decoder.DecodeFunctionBody(); |
| 940 | |
| 941 | if (decoder.interface().runtime_error()) { |
| 942 | thrower->RuntimeError("%s", decoder.interface().runtime_error_msg()); |
| 943 | return {}; |
| 944 | } |
| 945 | |
| 946 | return decoder.interface().result(); |
| 947 | } |
| 948 | } |
| 949 | } |
| 950 | } // namespace |
| 951 | |
| 952 | // Look up an import value in the {ffi_} object specifically for linking an |
| 953 | // asm.js module. This only performs non-observable lookups, which allows |
| 954 | // falling back to JavaScript proper (and hence re-executing all lookups) if |
| 955 | // module instantiation fails. |
| 956 | MaybeHandle<Object> InstanceBuilder::LookupImportAsm( |
| 957 | uint32_t index, Handle<String> import_name) { |
| 958 | // Check that a foreign function interface object was provided. |
| 959 | if (ffi_.is_null()) { |
| 960 | return ReportLinkError("missing imports object", index, import_name); |
| 961 | } |
| 962 | |
| 963 | // Perform lookup of the given {import_name} without causing any observable |
| 964 | // side-effect. We only accept accesses that resolve to data properties, |
| 965 | // which is indicated by the asm.js spec in section 7 ("Linking") as well. |
| 966 | PropertyKey key(isolate_, Handle<Name>::cast(import_name)); |
| 967 | LookupIterator it(isolate_, ffi_.ToHandleChecked(), key); |
| 968 | switch (it.state()) { |
| 969 | case LookupIterator::ACCESS_CHECK: |
| 970 | case LookupIterator::INTEGER_INDEXED_EXOTIC: |
| 971 | case LookupIterator::INTERCEPTOR: |
| 972 | case LookupIterator::JSPROXY: |
| 973 | case LookupIterator::ACCESSOR: |
| 974 | case LookupIterator::TRANSITION: |
| 975 | return ReportLinkError("not a data property", index, import_name); |
| 976 | case LookupIterator::NOT_FOUND: |
| 977 | // Accepting missing properties as undefined does not cause any |
| 978 | // observable difference from JavaScript semantics, we are lenient. |
| 979 | return isolate_->factory()->undefined_value(); |
| 980 | case LookupIterator::DATA: { |
| 981 | Handle<Object> value = it.GetDataValue(); |
| 982 | // For legacy reasons, we accept functions for imported globals (see |
| 983 | // {ProcessImportedGlobal}), but only if we can easily determine that |
| 984 | // their Number-conversion is side effect free and returns NaN (which is |
| 985 | // the case as long as "valueOf" (or others) are not overwritten). |
| 986 | if (value->IsJSFunction() && |
| 987 | module_->import_table[index].kind == kExternalGlobal && |
| 988 | !HasDefaultToNumberBehaviour(isolate_, |
| 989 | Handle<JSFunction>::cast(value))) { |
| 990 | return ReportLinkError("function has special ToNumber behaviour", index, |
| 991 | import_name); |
| 992 | } |
| 993 | return value; |
| 994 | } |
| 995 | } |
| 996 | } |
| 997 | |
| 998 | // Load data segments into the memory. |
| 999 | void InstanceBuilder::LoadDataSegments(Handle<WasmInstanceObject> instance) { |
| 1000 | base::Vector<const uint8_t> wire_bytes = |
| 1001 | module_object_->native_module()->wire_bytes(); |
| 1002 | for (const WasmDataSegment& segment : module_->data_segments) { |
| 1003 | uint32_t size = segment.source.length(); |
| 1004 | |
| 1005 | // Passive segments are not copied during instantiation. |
| 1006 | if (!segment.active) continue; |
| 1007 | |
| 1008 | size_t dest_offset; |
| 1009 | if (module_->is_memory64) { |
| 1010 | uint64_t dest_offset_64 = |
| 1011 | EvaluateInitExpression(&init_expr_zone_, segment.dest_addr, kWasmI64, |
| 1012 | isolate_, instance, thrower_) |
| 1013 | .to_u64(); |
| 1014 | if (thrower_->error()) return; |
| 1015 | // Clamp to {std::numeric_limits<size_t>::max()}, which is always an |
| 1016 | // invalid offset. |
| 1017 | DCHECK_GT(std::numeric_limits<size_t>::max(), instance->memory_size())((void) 0); |
| 1018 | dest_offset = static_cast<size_t>(std::min( |
| 1019 | dest_offset_64, uint64_t{std::numeric_limits<size_t>::max()})); |
| 1020 | } else { |
| 1021 | dest_offset = |
| 1022 | EvaluateInitExpression(&init_expr_zone_, segment.dest_addr, kWasmI32, |
| 1023 | isolate_, instance, thrower_) |
| 1024 | .to_u32(); |
| 1025 | if (thrower_->error()) return; |
| 1026 | } |
| 1027 | |
| 1028 | if (!base::IsInBounds<size_t>(dest_offset, size, instance->memory_size())) { |
| 1029 | thrower_->RuntimeError("data segment is out of bounds"); |
| 1030 | return; |
| 1031 | } |
| 1032 | |
| 1033 | std::memcpy(instance->memory_start() + dest_offset, |
| 1034 | wire_bytes.begin() + segment.source.offset(), size); |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | void InstanceBuilder::WriteGlobalValue(const WasmGlobal& global, |
| 1039 | const WasmValue& value) { |
| 1040 | TRACE("init [globals_start=%p + %u] = %s, type = %s\n", |
| 1041 | global.type.is_reference() |
| 1042 | ? reinterpret_cast<byte*>(tagged_globals_->address()) |
| 1043 | : raw_buffer_ptr(untagged_globals_, 0), |
| 1044 | global.offset, value.to_string().c_str(), global.type.name().c_str()); |
| 1045 | DCHECK(IsSubtypeOf(value.type(), global.type, module_))((void) 0); |
| 1046 | if (global.type.is_numeric()) { |
| 1047 | value.CopyTo(GetRawUntaggedGlobalPtr<byte>(global)); |
| 1048 | } else { |
| 1049 | tagged_globals_->set(global.offset, *value.to_ref()); |
| 1050 | } |
| 1051 | } |
| 1052 | |
| 1053 | void InstanceBuilder::SanitizeImports() { |
| 1054 | base::Vector<const uint8_t> wire_bytes = |
| 1055 | module_object_->native_module()->wire_bytes(); |
| 1056 | for (size_t index = 0; index < module_->import_table.size(); ++index) { |
| 1057 | const WasmImport& import = module_->import_table[index]; |
| 1058 | |
| 1059 | Handle<String> module_name = |
| 1060 | WasmModuleObject::ExtractUtf8StringFromModuleBytes( |
| 1061 | isolate_, wire_bytes, import.module_name, kInternalize); |
| 1062 | |
| 1063 | Handle<String> import_name = |
| 1064 | WasmModuleObject::ExtractUtf8StringFromModuleBytes( |
| 1065 | isolate_, wire_bytes, import.field_name, kInternalize); |
| 1066 | |
| 1067 | int int_index = static_cast<int>(index); |
| 1068 | MaybeHandle<Object> result = |
| 1069 | is_asmjs_module(module_) |
| 1070 | ? LookupImportAsm(int_index, import_name) |
| 1071 | : LookupImport(int_index, module_name, import_name); |
| 1072 | if (thrower_->error()) { |
| 1073 | thrower_->LinkError("Could not find value for import %zu", index); |
| 1074 | return; |
| 1075 | } |
| 1076 | Handle<Object> value = result.ToHandleChecked(); |
| 1077 | sanitized_imports_.push_back({module_name, import_name, value}); |
| 1078 | } |
| 1079 | } |
| 1080 | |
| 1081 | bool InstanceBuilder::FindImportedMemory() { |
| 1082 | DCHECK_EQ(module_->import_table.size(), sanitized_imports_.size())((void) 0); |
| 1083 | for (size_t index = 0; index < module_->import_table.size(); index++) { |
| 1084 | WasmImport import = module_->import_table[index]; |
| 1085 | |
| 1086 | if (import.kind == kExternalMemory) { |
| 1087 | auto& value = sanitized_imports_[index].value; |
| 1088 | if (!value->IsWasmMemoryObject()) return false; |
| 1089 | memory_object_ = Handle<WasmMemoryObject>::cast(value); |
| 1090 | memory_buffer_ = |
| 1091 | Handle<JSArrayBuffer>(memory_object_->array_buffer(), isolate_); |
| 1092 | return true; |
| 1093 | } |
| 1094 | } |
| 1095 | return false; |
| 1096 | } |
| 1097 | |
| 1098 | bool InstanceBuilder::ProcessImportedFunction( |
| 1099 | Handle<WasmInstanceObject> instance, int import_index, int func_index, |
| 1100 | Handle<String> module_name, Handle<String> import_name, |
| 1101 | Handle<Object> value) { |
| 1102 | // Function imports must be callable. |
| 1103 | if (!value->IsCallable()) { |
| 1104 | ReportLinkError("function import requires a callable", import_index, |
| 1105 | module_name, import_name); |
| 1106 | return false; |
| 1107 | } |
| 1108 | // Store any {WasmExternalFunction} callable in the instance before the call |
| 1109 | // is resolved to preserve its identity. This handles exported functions as |
| 1110 | // well as functions constructed via other means (e.g. WebAssembly.Function). |
| 1111 | if (WasmExternalFunction::IsWasmExternalFunction(*value)) { |
| 1112 | WasmInstanceObject::SetWasmInternalFunction( |
| 1113 | isolate_, instance, func_index, |
| 1114 | WasmInternalFunction::FromExternal( |
| 1115 | Handle<WasmExternalFunction>::cast(value), isolate_) |
| 1116 | .ToHandleChecked()); |
| 1117 | } |
| 1118 | auto js_receiver = Handle<JSReceiver>::cast(value); |
| 1119 | const FunctionSig* expected_sig = module_->functions[func_index].sig; |
| 1120 | auto resolved = compiler::ResolveWasmImportCall(js_receiver, expected_sig, |
| 1121 | module_, enabled_); |
| 1122 | compiler::WasmImportCallKind kind = resolved.kind; |
| 1123 | js_receiver = resolved.callable; |
| 1124 | switch (kind) { |
| 1125 | case compiler::WasmImportCallKind::kLinkError: |
| 1126 | ReportLinkError("imported function does not match the expected type", |
| 1127 | import_index, module_name, import_name); |
| 1128 | return false; |
| 1129 | case compiler::WasmImportCallKind::kWasmToWasm: { |
| 1130 | // The imported function is a Wasm function from another instance. |
| 1131 | auto imported_function = Handle<WasmExportedFunction>::cast(js_receiver); |
| 1132 | Handle<WasmInstanceObject> imported_instance( |
| 1133 | imported_function->instance(), isolate_); |
| 1134 | // The import reference is the instance object itself. |
| 1135 | Address imported_target = imported_function->GetWasmCallTarget(); |
| 1136 | ImportedFunctionEntry entry(instance, func_index); |
| 1137 | entry.SetWasmToWasm(*imported_instance, imported_target); |
| 1138 | break; |
| 1139 | } |
| 1140 | case compiler::WasmImportCallKind::kWasmToCapi: { |
| 1141 | NativeModule* native_module = instance->module_object().native_module(); |
| 1142 | int expected_arity = static_cast<int>(expected_sig->parameter_count()); |
| 1143 | WasmImportWrapperCache* cache = native_module->import_wrapper_cache(); |
| 1144 | // TODO(jkummerow): Consider precompiling CapiCallWrappers in parallel, |
| 1145 | // just like other import wrappers. |
| 1146 | WasmCode* wasm_code = |
| 1147 | cache->MaybeGet(kind, expected_sig, expected_arity, kNoSuspend); |
| 1148 | if (wasm_code == nullptr) { |
| 1149 | WasmCodeRefScope code_ref_scope; |
| 1150 | WasmImportWrapperCache::ModificationScope cache_scope(cache); |
| 1151 | wasm_code = |
| 1152 | compiler::CompileWasmCapiCallWrapper(native_module, expected_sig); |
| 1153 | WasmImportWrapperCache::CacheKey key(kind, expected_sig, expected_arity, |
| 1154 | kNoSuspend); |
| 1155 | cache_scope[key] = wasm_code; |
| 1156 | wasm_code->IncRef(); |
| 1157 | isolate_->counters()->wasm_generated_code_size()->Increment( |
| 1158 | wasm_code->instructions().length()); |
| 1159 | isolate_->counters()->wasm_reloc_size()->Increment( |
| 1160 | wasm_code->reloc_info().length()); |
| 1161 | } |
| 1162 | |
| 1163 | ImportedFunctionEntry entry(instance, func_index); |
| 1164 | // We re-use the SetWasmToJs infrastructure because it passes the |
| 1165 | // callable to the wrapper, which we need to get the function data. |
| 1166 | entry.SetWasmToJs(isolate_, js_receiver, wasm_code, |
| 1167 | isolate_->factory()->undefined_value()); |
| 1168 | break; |
| 1169 | } |
| 1170 | case compiler::WasmImportCallKind::kWasmToJSFastApi: { |
| 1171 | NativeModule* native_module = instance->module_object().native_module(); |
| 1172 | DCHECK(js_receiver->IsJSFunction())((void) 0); |
| 1173 | Handle<JSFunction> function = Handle<JSFunction>::cast(js_receiver); |
| 1174 | |
| 1175 | WasmCodeRefScope code_ref_scope; |
| 1176 | WasmCode* wasm_code = compiler::CompileWasmJSFastCallWrapper( |
| 1177 | native_module, expected_sig, function); |
| 1178 | ImportedFunctionEntry entry(instance, func_index); |
| 1179 | entry.SetWasmToJs(isolate_, js_receiver, wasm_code, |
| 1180 | isolate_->factory()->undefined_value()); |
| 1181 | break; |
| 1182 | } |
| 1183 | default: { |
| 1184 | // The imported function is a callable. |
| 1185 | |
| 1186 | int expected_arity = static_cast<int>(expected_sig->parameter_count()); |
| 1187 | if (kind == compiler::WasmImportCallKind::kJSFunctionArityMismatch) { |
| 1188 | Handle<JSFunction> function = Handle<JSFunction>::cast(js_receiver); |
| 1189 | SharedFunctionInfo shared = function->shared(); |
| 1190 | expected_arity = |
| 1191 | shared.internal_formal_parameter_count_without_receiver(); |
| 1192 | } |
| 1193 | |
| 1194 | NativeModule* native_module = instance->module_object().native_module(); |
| 1195 | Suspend suspend = |
| 1196 | resolved.suspender.is_null() || resolved.suspender->IsUndefined() |
| 1197 | ? kNoSuspend |
| 1198 | : kSuspend; |
| 1199 | WasmCode* wasm_code = native_module->import_wrapper_cache()->Get( |
| 1200 | kind, expected_sig, expected_arity, suspend); |
| 1201 | DCHECK_NOT_NULL(wasm_code)((void) 0); |
| 1202 | ImportedFunctionEntry entry(instance, func_index); |
| 1203 | if (wasm_code->kind() == WasmCode::kWasmToJsWrapper) { |
| 1204 | // Wasm to JS wrappers are treated specially in the import table. |
| 1205 | entry.SetWasmToJs(isolate_, js_receiver, wasm_code, resolved.suspender); |
| 1206 | } else { |
| 1207 | // Wasm math intrinsics are compiled as regular Wasm functions. |
| 1208 | DCHECK(kind >= compiler::WasmImportCallKind::kFirstMathIntrinsic &&((void) 0) |
| 1209 | kind <= compiler::WasmImportCallKind::kLastMathIntrinsic)((void) 0); |
| 1210 | entry.SetWasmToWasm(*instance, wasm_code->instruction_start()); |
| 1211 | } |
| 1212 | break; |
| 1213 | } |
| 1214 | } |
| 1215 | return true; |
| 1216 | } |
| 1217 | |
| 1218 | bool InstanceBuilder::InitializeImportedIndirectFunctionTable( |
| 1219 | Handle<WasmInstanceObject> instance, int table_index, int import_index, |
| 1220 | Handle<WasmTableObject> table_object) { |
| 1221 | int imported_table_size = table_object->current_length(); |
| 1222 | // Allocate a new dispatch table. |
| 1223 | WasmInstanceObject::EnsureIndirectFunctionTableWithMinimumSize( |
| 1224 | instance, table_index, imported_table_size); |
| 1225 | // Initialize the dispatch table with the (foreign) JS functions |
| 1226 | // that are already in the table. |
| 1227 | for (int i = 0; i < imported_table_size; ++i) { |
| 1228 | bool is_valid; |
| 1229 | bool is_null; |
| 1230 | MaybeHandle<WasmInstanceObject> maybe_target_instance; |
| 1231 | int function_index; |
| 1232 | MaybeHandle<WasmJSFunction> maybe_js_function; |
| 1233 | WasmTableObject::GetFunctionTableEntry( |
| 1234 | isolate_, module_, table_object, i, &is_valid, &is_null, |
| 1235 | &maybe_target_instance, &function_index, &maybe_js_function); |
| 1236 | if (!is_valid) { |
| 1237 | thrower_->LinkError("table import %d[%d] is not a wasm function", |
| 1238 | import_index, i); |
| 1239 | return false; |
| 1240 | } |
| 1241 | if (is_null) continue; |
| 1242 | Handle<WasmJSFunction> js_function; |
| 1243 | if (maybe_js_function.ToHandle(&js_function)) { |
| 1244 | WasmInstanceObject::ImportWasmJSFunctionIntoTable( |
| 1245 | isolate_, instance, table_index, i, js_function); |
| 1246 | continue; |
| 1247 | } |
| 1248 | |
| 1249 | Handle<WasmInstanceObject> target_instance = |
| 1250 | maybe_target_instance.ToHandleChecked(); |
| 1251 | const FunctionSig* sig = target_instance->module_object() |
| 1252 | .module() |
| 1253 | ->functions[function_index] |
| 1254 | .sig; |
| 1255 | |
| 1256 | // Look up the signature's canonical id. If there is no canonical |
| 1257 | // id, then the signature does not appear at all in this module, |
| 1258 | // so putting {-1} in the table will cause checks to always fail. |
| 1259 | FunctionTargetAndRef entry(target_instance, function_index); |
| 1260 | instance->GetIndirectFunctionTable(isolate_, table_index) |
| 1261 | ->Set(i, module_->signature_map.Find(*sig), entry.call_target(), |
| 1262 | *entry.ref()); |
| 1263 | } |
| 1264 | return true; |
| 1265 | } |
| 1266 | |
| 1267 | bool InstanceBuilder::ProcessImportedTable(Handle<WasmInstanceObject> instance, |
| 1268 | int import_index, int table_index, |
| 1269 | Handle<String> module_name, |
| 1270 | Handle<String> import_name, |
| 1271 | Handle<Object> value) { |
| 1272 | if (!value->IsWasmTableObject()) { |
| 1273 | ReportLinkError("table import requires a WebAssembly.Table", import_index, |
| 1274 | module_name, import_name); |
| 1275 | return false; |
| 1276 | } |
| 1277 | const WasmTable& table = module_->tables[table_index]; |
| 1278 | |
| 1279 | auto table_object = Handle<WasmTableObject>::cast(value); |
| 1280 | |
| 1281 | uint32_t imported_table_size = |
| 1282 | static_cast<uint32_t>(table_object->current_length()); |
| 1283 | if (imported_table_size < table.initial_size) { |
| 1284 | thrower_->LinkError("table import %d is smaller than initial %u, got %u", |
| 1285 | import_index, table.initial_size, imported_table_size); |
| 1286 | return false; |
| 1287 | } |
| 1288 | |
| 1289 | if (table.has_maximum_size) { |
| 1290 | if (table_object->maximum_length().IsUndefined(isolate_)) { |
| 1291 | thrower_->LinkError("table import %d has no maximum length, expected %u", |
| 1292 | import_index, table.maximum_size); |
| 1293 | return false; |
| 1294 | } |
| 1295 | int64_t imported_maximum_size = table_object->maximum_length().Number(); |
| 1296 | if (imported_maximum_size < 0) { |
| 1297 | thrower_->LinkError("table import %d has no maximum length, expected %u", |
| 1298 | import_index, table.maximum_size); |
| 1299 | return false; |
| 1300 | } |
| 1301 | if (imported_maximum_size > table.maximum_size) { |
| 1302 | thrower_->LinkError("table import %d has a larger maximum size %" PRIx64"l" "x" |
| 1303 | " than the module's declared maximum %u", |
| 1304 | import_index, imported_maximum_size, |
| 1305 | table.maximum_size); |
| 1306 | return false; |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | const WasmModule* table_type_module = |
| 1311 | !table_object->instance().IsUndefined() |
| 1312 | ? WasmInstanceObject::cast(table_object->instance()).module() |
| 1313 | : instance->module(); |
| 1314 | |
| 1315 | if (!EquivalentTypes(table.type, table_object->type(), module_, |
| 1316 | table_type_module)) { |
| 1317 | ReportLinkError("imported table does not match the expected type", |
| 1318 | import_index, module_name, import_name); |
| 1319 | return false; |
| 1320 | } |
| 1321 | |
| 1322 | if (IsSubtypeOf(table.type, kWasmFuncRef, module_) && |
| 1323 | !InitializeImportedIndirectFunctionTable(instance, table_index, |
| 1324 | import_index, table_object)) { |
| 1325 | return false; |
| 1326 | } |
| 1327 | |
| 1328 | instance->tables().set(table_index, *value); |
| 1329 | return true; |
| 1330 | } |
| 1331 | |
| 1332 | bool InstanceBuilder::ProcessImportedMemory(Handle<WasmInstanceObject> instance, |
| 1333 | int import_index, |
| 1334 | Handle<String> module_name, |
| 1335 | Handle<String> import_name, |
| 1336 | Handle<Object> value) { |
| 1337 | if (!value->IsWasmMemoryObject()) { |
| 1338 | ReportLinkError("memory import must be a WebAssembly.Memory object", |
| 1339 | import_index, module_name, import_name); |
| 1340 | return false; |
| 1341 | } |
| 1342 | auto memory_object = Handle<WasmMemoryObject>::cast(value); |
| 1343 | |
| 1344 | // The imported memory should have been already set up early. |
| 1345 | CHECK_EQ(instance->memory_object(), *memory_object)do { bool _cmp = ::v8::base::CmpEQImpl< typename ::v8::base ::pass_value_or_ref<decltype(instance->memory_object()) >::type, typename ::v8::base::pass_value_or_ref<decltype (*memory_object)>::type>((instance->memory_object()) , (*memory_object)); do { if ((__builtin_expect(!!(!(_cmp)), 0 ))) { V8_Fatal("Check failed: %s.", "instance->memory_object()" " " "==" " " "*memory_object"); } } while (false); } while ( false); |
| 1346 | |
| 1347 | Handle<JSArrayBuffer> buffer(memory_object_->array_buffer(), isolate_); |
| 1348 | // memory_ should have already been assigned in Build(). |
| 1349 | DCHECK_EQ(*memory_buffer_.ToHandleChecked(), *buffer)((void) 0); |
| 1350 | uint32_t imported_cur_pages = |
| 1351 | static_cast<uint32_t>(buffer->byte_length() / kWasmPageSize); |
| 1352 | if (imported_cur_pages < module_->initial_pages) { |
| 1353 | thrower_->LinkError("memory import %d is smaller than initial %u, got %u", |
| 1354 | import_index, module_->initial_pages, |
| 1355 | imported_cur_pages); |
| 1356 | return false; |
| 1357 | } |
| 1358 | int32_t imported_maximum_pages = memory_object_->maximum_pages(); |
| 1359 | if (module_->has_maximum_pages) { |
| 1360 | if (imported_maximum_pages < 0) { |
| 1361 | thrower_->LinkError( |
| 1362 | "memory import %d has no maximum limit, expected at most %u", |
| 1363 | import_index, imported_maximum_pages); |
| 1364 | return false; |
| 1365 | } |
| 1366 | if (static_cast<uint32_t>(imported_maximum_pages) > |
| 1367 | module_->maximum_pages) { |
| 1368 | thrower_->LinkError( |
| 1369 | "memory import %d has a larger maximum size %u than the " |
| 1370 | "module's declared maximum %u", |
| 1371 | import_index, imported_maximum_pages, module_->maximum_pages); |
| 1372 | return false; |
| 1373 | } |
| 1374 | } |
| 1375 | if (module_->has_shared_memory != buffer->is_shared()) { |
| 1376 | thrower_->LinkError( |
| 1377 | "mismatch in shared state of memory, declared = %d, imported = %d", |
| 1378 | module_->has_shared_memory, buffer->is_shared()); |
| 1379 | return false; |
| 1380 | } |
| 1381 | |
| 1382 | return true; |
| 1383 | } |
| 1384 | |
| 1385 | bool InstanceBuilder::ProcessImportedWasmGlobalObject( |
| 1386 | Handle<WasmInstanceObject> instance, int import_index, |
| 1387 | Handle<String> module_name, Handle<String> import_name, |
| 1388 | const WasmGlobal& global, Handle<WasmGlobalObject> global_object) { |
| 1389 | if (static_cast<bool>(global_object->is_mutable()) != global.mutability) { |
| 1390 | ReportLinkError("imported global does not match the expected mutability", |
| 1391 | import_index, module_name, import_name); |
| 1392 | return false; |
| 1393 | } |
| 1394 | |
| 1395 | const WasmModule* global_type_module = |
| 1396 | !global_object->instance().IsUndefined() |
| 1397 | ? WasmInstanceObject::cast(global_object->instance()).module() |
| 1398 | : instance->module(); |
| 1399 | |
| 1400 | bool valid_type = |
| 1401 | global.mutability |
| 1402 | ? EquivalentTypes(global_object->type(), global.type, |
| 1403 | global_type_module, instance->module()) |
| 1404 | : IsSubtypeOf(global_object->type(), global.type, global_type_module, |
| 1405 | instance->module()); |
| 1406 | |
| 1407 | if (!valid_type) { |
| 1408 | ReportLinkError("imported global does not match the expected type", |
| 1409 | import_index, module_name, import_name); |
| 1410 | return false; |
| 1411 | } |
| 1412 | if (global.mutability) { |
| 1413 | DCHECK_LT(global.index, module_->num_imported_mutable_globals)((void) 0); |
| 1414 | Handle<Object> buffer; |
| 1415 | Address address_or_offset; |
| 1416 | if (global.type.is_reference()) { |
| 1417 | static_assert(sizeof(global_object->offset()) <= sizeof(Address), |
| 1418 | "The offset into the globals buffer does not fit into " |
| 1419 | "the imported_mutable_globals array"); |
| 1420 | buffer = handle(global_object->tagged_buffer(), isolate_); |
| 1421 | // For externref globals we use a relative offset, not an absolute |
| 1422 | // address. |
| 1423 | address_or_offset = static_cast<Address>(global_object->offset()); |
| 1424 | } else { |
| 1425 | buffer = handle(global_object->untagged_buffer(), isolate_); |
| 1426 | // It is safe in this case to store the raw pointer to the buffer |
| 1427 | // since the backing store of the JSArrayBuffer will not be |
| 1428 | // relocated. |
| 1429 | address_or_offset = reinterpret_cast<Address>(raw_buffer_ptr( |
| 1430 | Handle<JSArrayBuffer>::cast(buffer), global_object->offset())); |
| 1431 | } |
| 1432 | instance->imported_mutable_globals_buffers().set(global.index, *buffer); |
| 1433 | instance->imported_mutable_globals()[global.index] = address_or_offset; |
| 1434 | return true; |
| 1435 | } |
| 1436 | |
| 1437 | WasmValue value; |
| 1438 | switch (global_object->type().kind()) { |
| 1439 | case kI32: |
| 1440 | value = WasmValue(global_object->GetI32()); |
| 1441 | break; |
| 1442 | case kI64: |
| 1443 | value = WasmValue(global_object->GetI64()); |
| 1444 | break; |
| 1445 | case kF32: |
| 1446 | value = WasmValue(global_object->GetF32()); |
| 1447 | break; |
| 1448 | case kF64: |
| 1449 | value = WasmValue(global_object->GetF64()); |
| 1450 | break; |
| 1451 | case kRtt: |
| 1452 | case kRef: |
| 1453 | case kOptRef: |
| 1454 | value = WasmValue(global_object->GetRef(), global_object->type()); |
| 1455 | break; |
| 1456 | case kVoid: |
| 1457 | case kS128: |
| 1458 | case kBottom: |
| 1459 | case kI8: |
| 1460 | case kI16: |
| 1461 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 1462 | } |
| 1463 | |
| 1464 | WriteGlobalValue(global, value); |
| 1465 | return true; |
| 1466 | } |
| 1467 | |
| 1468 | bool InstanceBuilder::ProcessImportedGlobal(Handle<WasmInstanceObject> instance, |
| 1469 | int import_index, int global_index, |
| 1470 | Handle<String> module_name, |
| 1471 | Handle<String> import_name, |
| 1472 | Handle<Object> value) { |
| 1473 | // Immutable global imports are converted to numbers and written into |
| 1474 | // the {untagged_globals_} array buffer. |
| 1475 | // |
| 1476 | // Mutable global imports instead have their backing array buffers |
| 1477 | // referenced by this instance, and store the address of the imported |
| 1478 | // global in the {imported_mutable_globals_} array. |
| 1479 | const WasmGlobal& global = module_->globals[global_index]; |
| 1480 | |
| 1481 | // SIMD proposal allows modules to define an imported v128 global, and only |
| 1482 | // supports importing a WebAssembly.Global object for this global, but also |
| 1483 | // defines constructing a WebAssembly.Global of v128 to be a TypeError. |
| 1484 | // We *should* never hit this case in the JS API, but the module should should |
| 1485 | // be allowed to declare such a global (no validation error). |
| 1486 | if (global.type == kWasmS128 && !value->IsWasmGlobalObject()) { |
| 1487 | ReportLinkError("global import of type v128 must be a WebAssembly.Global", |
| 1488 | import_index, module_name, import_name); |
| 1489 | return false; |
| 1490 | } |
| 1491 | |
| 1492 | if (is_asmjs_module(module_)) { |
| 1493 | // Accepting {JSFunction} on top of just primitive values here is a |
| 1494 | // workaround to support legacy asm.js code with broken binding. Note |
| 1495 | // that using {NaN} (or Smi::zero()) here is what using the observable |
| 1496 | // conversion via {ToPrimitive} would produce as well. {LookupImportAsm} |
| 1497 | // checked via {HasDefaultToNumberBehaviour} that "valueOf" or friends have |
| 1498 | // not been patched. |
| 1499 | if (value->IsJSFunction()) value = isolate_->factory()->nan_value(); |
| 1500 | if (value->IsPrimitive()) { |
| 1501 | MaybeHandle<Object> converted = global.type == kWasmI32 |
| 1502 | ? Object::ToInt32(isolate_, value) |
| 1503 | : Object::ToNumber(isolate_, value); |
| 1504 | if (!converted.ToHandle(&value)) { |
| 1505 | // Conversion is known to fail for Symbols and BigInts. |
| 1506 | ReportLinkError("global import must be a number", import_index, |
| 1507 | module_name, import_name); |
| 1508 | return false; |
| 1509 | } |
| 1510 | } |
| 1511 | } |
| 1512 | |
| 1513 | if (value->IsWasmGlobalObject()) { |
| 1514 | auto global_object = Handle<WasmGlobalObject>::cast(value); |
| 1515 | return ProcessImportedWasmGlobalObject(instance, import_index, module_name, |
| 1516 | import_name, global, global_object); |
| 1517 | } |
| 1518 | |
| 1519 | if (global.mutability) { |
| 1520 | ReportLinkError( |
| 1521 | "imported mutable global must be a WebAssembly.Global object", |
| 1522 | import_index, module_name, import_name); |
| 1523 | return false; |
| 1524 | } |
| 1525 | |
| 1526 | if (global.type.is_reference()) { |
| 1527 | const char* error_message; |
| 1528 | if (!wasm::TypecheckJSObject(isolate_, module_, value, global.type, |
| 1529 | &error_message)) { |
| 1530 | ReportLinkError(error_message, global_index, module_name, import_name); |
| 1531 | return false; |
| 1532 | } |
| 1533 | if (IsSubtypeOf(global.type, kWasmFuncRef, module_) && !value->IsNull()) { |
| 1534 | value = |
| 1535 | WasmInternalFunction::FromExternal(value, isolate_).ToHandleChecked(); |
| 1536 | } |
| 1537 | WriteGlobalValue(global, WasmValue(value, global.type)); |
| 1538 | return true; |
| 1539 | } |
| 1540 | |
| 1541 | if (value->IsNumber() && global.type != kWasmI64) { |
| 1542 | double number_value = value->Number(); |
| 1543 | // The Wasm-BigInt proposal currently says that i64 globals may |
| 1544 | // only be initialized with BigInts. See: |
| 1545 | // https://github.com/WebAssembly/JS-BigInt-integration/issues/12 |
| 1546 | WasmValue wasm_value = global.type == kWasmI32 |
| 1547 | ? WasmValue(DoubleToInt32(number_value)) |
| 1548 | : global.type == kWasmF32 |
| 1549 | ? WasmValue(DoubleToFloat32(number_value)) |
| 1550 | : WasmValue(number_value); |
| 1551 | WriteGlobalValue(global, wasm_value); |
| 1552 | return true; |
| 1553 | } |
| 1554 | |
| 1555 | if (global.type == kWasmI64 && value->IsBigInt()) { |
| 1556 | WriteGlobalValue(global, WasmValue(BigInt::cast(*value).AsInt64())); |
| 1557 | return true; |
| 1558 | } |
| 1559 | |
| 1560 | ReportLinkError( |
| 1561 | "global import must be a number, valid Wasm reference, or " |
| 1562 | "WebAssembly.Global object", |
| 1563 | import_index, module_name, import_name); |
| 1564 | return false; |
| 1565 | } |
| 1566 | |
| 1567 | void InstanceBuilder::CompileImportWrappers( |
| 1568 | Handle<WasmInstanceObject> instance) { |
| 1569 | int num_imports = static_cast<int>(module_->import_table.size()); |
| 1570 | TRACE_EVENT1("v8.wasm", "wasm.CompileImportWrappers", "num_imports",static v8::base::AtomicWord trace_event_unique_atomic1571 = 0 ; const uint8_t* trace_event_unique_category_group_enabled1571 ; trace_event_unique_category_group_enabled1571 = reinterpret_cast <const uint8_t*>(v8::base::Relaxed_Load(&(trace_event_unique_atomic1571 ))); if (!trace_event_unique_category_group_enabled1571) { trace_event_unique_category_group_enabled1571 = v8::internal::tracing::TraceEventHelper::GetTracingController () ->GetCategoryGroupEnabled("v8.wasm"); v8::base::Relaxed_Store (&(trace_event_unique_atomic1571), (reinterpret_cast<v8 ::base::AtomicWord>( trace_event_unique_category_group_enabled1571 ))); };; v8::internal::tracing::ScopedTracer trace_event_unique_tracer1571 ; if (v8::base::Relaxed_Load(reinterpret_cast<const v8::base ::Atomic8*>( trace_event_unique_category_group_enabled1571 )) & (kEnabledForRecording_CategoryGroupEnabledFlags | kEnabledForEventCallback_CategoryGroupEnabledFlags )) { uint64_t h = v8::internal::tracing::AddTraceEvent( ('X') , trace_event_unique_category_group_enabled1571, "wasm.CompileImportWrappers" , v8::internal::tracing::kGlobalScope, v8::internal::tracing:: kNoId, v8::internal::tracing::kNoId, (static_cast<unsigned int>(0)), "num_imports", num_imports); trace_event_unique_tracer1571 .Initialize(trace_event_unique_category_group_enabled1571, "wasm.CompileImportWrappers" , h); } |
| 1571 | num_imports)static v8::base::AtomicWord trace_event_unique_atomic1571 = 0 ; const uint8_t* trace_event_unique_category_group_enabled1571 ; trace_event_unique_category_group_enabled1571 = reinterpret_cast <const uint8_t*>(v8::base::Relaxed_Load(&(trace_event_unique_atomic1571 ))); if (!trace_event_unique_category_group_enabled1571) { trace_event_unique_category_group_enabled1571 = v8::internal::tracing::TraceEventHelper::GetTracingController () ->GetCategoryGroupEnabled("v8.wasm"); v8::base::Relaxed_Store (&(trace_event_unique_atomic1571), (reinterpret_cast<v8 ::base::AtomicWord>( trace_event_unique_category_group_enabled1571 ))); };; v8::internal::tracing::ScopedTracer trace_event_unique_tracer1571 ; if (v8::base::Relaxed_Load(reinterpret_cast<const v8::base ::Atomic8*>( trace_event_unique_category_group_enabled1571 )) & (kEnabledForRecording_CategoryGroupEnabledFlags | kEnabledForEventCallback_CategoryGroupEnabledFlags )) { uint64_t h = v8::internal::tracing::AddTraceEvent( ('X') , trace_event_unique_category_group_enabled1571, "wasm.CompileImportWrappers" , v8::internal::tracing::kGlobalScope, v8::internal::tracing:: kNoId, v8::internal::tracing::kNoId, (static_cast<unsigned int>(0)), "num_imports", num_imports); trace_event_unique_tracer1571 .Initialize(trace_event_unique_category_group_enabled1571, "wasm.CompileImportWrappers" , h); }; |
| 1572 | NativeModule* native_module = instance->module_object().native_module(); |
| 1573 | WasmImportWrapperCache::ModificationScope cache_scope( |
| 1574 | native_module->import_wrapper_cache()); |
| 1575 | |
| 1576 | // Compilation is done in two steps: |
| 1577 | // 1) Insert nullptr entries in the cache for wrappers that need to be |
| 1578 | // compiled. 2) Compile wrappers in background tasks using the |
| 1579 | // ImportWrapperQueue. This way the cache won't invalidate other iterators |
| 1580 | // when inserting a new WasmCode, since the key will already be there. |
| 1581 | ImportWrapperQueue import_wrapper_queue; |
| 1582 | for (int index = 0; index < num_imports; ++index) { |
| 1583 | Handle<Object> value = sanitized_imports_[index].value; |
| 1584 | if (module_->import_table[index].kind != kExternalFunction || |
| 1585 | !value->IsCallable()) { |
| 1586 | continue; |
| 1587 | } |
| 1588 | auto js_receiver = Handle<JSReceiver>::cast(value); |
| 1589 | uint32_t func_index = module_->import_table[index].index; |
| 1590 | const FunctionSig* sig = module_->functions[func_index].sig; |
| 1591 | auto resolved = |
| 1592 | compiler::ResolveWasmImportCall(js_receiver, sig, module_, enabled_); |
| 1593 | compiler::WasmImportCallKind kind = resolved.kind; |
| 1594 | if (kind == compiler::WasmImportCallKind::kWasmToWasm || |
| 1595 | kind == compiler::WasmImportCallKind::kLinkError || |
| 1596 | kind == compiler::WasmImportCallKind::kWasmToCapi || |
| 1597 | kind == compiler::WasmImportCallKind::kWasmToJSFastApi) { |
| 1598 | continue; |
| 1599 | } |
| 1600 | |
| 1601 | int expected_arity = static_cast<int>(sig->parameter_count()); |
| 1602 | if (resolved.kind == |
| 1603 | compiler::WasmImportCallKind::kJSFunctionArityMismatch) { |
| 1604 | Handle<JSFunction> function = Handle<JSFunction>::cast(resolved.callable); |
| 1605 | SharedFunctionInfo shared = function->shared(); |
| 1606 | expected_arity = |
| 1607 | shared.internal_formal_parameter_count_without_receiver(); |
| 1608 | } |
| 1609 | |
| 1610 | Suspend suspend = |
| 1611 | resolved.suspender.is_null() || resolved.suspender->IsUndefined() |
| 1612 | ? kNoSuspend |
| 1613 | : kSuspend; |
| 1614 | WasmImportWrapperCache::CacheKey key(kind, sig, expected_arity, suspend); |
| 1615 | if (cache_scope[key] != nullptr) { |
| 1616 | // Cache entry already exists, no need to compile it again. |
| 1617 | continue; |
| 1618 | } |
| 1619 | import_wrapper_queue.insert(key); |
| 1620 | } |
| 1621 | |
| 1622 | auto compile_job_task = std::make_unique<CompileImportWrapperJob>( |
| 1623 | isolate_->counters(), native_module, &import_wrapper_queue, &cache_scope); |
| 1624 | auto compile_job = V8::GetCurrentPlatform()->PostJob( |
| 1625 | TaskPriority::kUserVisible, std::move(compile_job_task)); |
| 1626 | |
| 1627 | // Wait for the job to finish, while contributing in this thread. |
| 1628 | compile_job->Join(); |
| 1629 | } |
| 1630 | |
| 1631 | // Process the imports, including functions, tables, globals, and memory, in |
| 1632 | // order, loading them from the {ffi_} object. Returns the number of imported |
| 1633 | // functions. |
| 1634 | int InstanceBuilder::ProcessImports(Handle<WasmInstanceObject> instance) { |
| 1635 | int num_imported_functions = 0; |
| 1636 | int num_imported_tables = 0; |
| 1637 | |
| 1638 | DCHECK_EQ(module_->import_table.size(), sanitized_imports_.size())((void) 0); |
| 1639 | |
| 1640 | CompileImportWrappers(instance); |
| 1641 | int num_imports = static_cast<int>(module_->import_table.size()); |
| 1642 | for (int index = 0; index < num_imports; ++index) { |
| 1643 | const WasmImport& import = module_->import_table[index]; |
| 1644 | |
| 1645 | Handle<String> module_name = sanitized_imports_[index].module_name; |
| 1646 | Handle<String> import_name = sanitized_imports_[index].import_name; |
| 1647 | Handle<Object> value = sanitized_imports_[index].value; |
| 1648 | |
| 1649 | switch (import.kind) { |
| 1650 | case kExternalFunction: { |
| 1651 | uint32_t func_index = import.index; |
| 1652 | DCHECK_EQ(num_imported_functions, func_index)((void) 0); |
| 1653 | if (!ProcessImportedFunction(instance, index, func_index, module_name, |
| 1654 | import_name, value)) { |
| 1655 | return -1; |
| 1656 | } |
| 1657 | num_imported_functions++; |
| 1658 | break; |
| 1659 | } |
| 1660 | case kExternalTable: { |
| 1661 | uint32_t table_index = import.index; |
| 1662 | DCHECK_EQ(table_index, num_imported_tables)((void) 0); |
| 1663 | if (!ProcessImportedTable(instance, index, table_index, module_name, |
| 1664 | import_name, value)) { |
| 1665 | return -1; |
| 1666 | } |
| 1667 | num_imported_tables++; |
| 1668 | USE(num_imported_tables)do { ::v8::base::Use unused_tmp_array_for_use_macro[]{num_imported_tables }; (void)unused_tmp_array_for_use_macro; } while (false); |
| 1669 | break; |
| 1670 | } |
| 1671 | case kExternalMemory: { |
| 1672 | if (!ProcessImportedMemory(instance, index, module_name, import_name, |
| 1673 | value)) { |
| 1674 | return -1; |
| 1675 | } |
| 1676 | break; |
| 1677 | } |
| 1678 | case kExternalGlobal: { |
| 1679 | if (!ProcessImportedGlobal(instance, index, import.index, module_name, |
| 1680 | import_name, value)) { |
| 1681 | return -1; |
| 1682 | } |
| 1683 | break; |
| 1684 | } |
| 1685 | case kExternalTag: { |
| 1686 | if (!value->IsWasmTagObject()) { |
| 1687 | ReportLinkError("tag import requires a WebAssembly.Tag", index, |
| 1688 | module_name, import_name); |
| 1689 | return -1; |
| 1690 | } |
| 1691 | Handle<WasmTagObject> imported_tag = Handle<WasmTagObject>::cast(value); |
| 1692 | if (!imported_tag->MatchesSignature(module_->tags[import.index].sig)) { |
| 1693 | ReportLinkError("imported tag does not match the expected type", |
| 1694 | index, module_name, import_name); |
| 1695 | return -1; |
| 1696 | } |
| 1697 | Object tag = imported_tag->tag(); |
| 1698 | DCHECK(instance->tags_table().get(import.index).IsUndefined())((void) 0); |
| 1699 | instance->tags_table().set(import.index, tag); |
| 1700 | tags_wrappers_[import.index] = imported_tag; |
| 1701 | break; |
| 1702 | } |
| 1703 | default: |
| 1704 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 1705 | } |
| 1706 | } |
| 1707 | return num_imported_functions; |
| 1708 | } |
| 1709 | |
| 1710 | template <typename T> |
| 1711 | T* InstanceBuilder::GetRawUntaggedGlobalPtr(const WasmGlobal& global) { |
| 1712 | return reinterpret_cast<T*>(raw_buffer_ptr(untagged_globals_, global.offset)); |
| 1713 | } |
| 1714 | |
| 1715 | // Process initialization of globals. |
| 1716 | void InstanceBuilder::InitGlobals(Handle<WasmInstanceObject> instance) { |
| 1717 | for (const WasmGlobal& global : module_->globals) { |
| 1718 | if (global.mutability && global.imported) continue; |
| 1719 | // Happens with imported globals. |
| 1720 | if (!global.init.is_set()) continue; |
| 1721 | |
| 1722 | WasmValue value = |
| 1723 | EvaluateInitExpression(&init_expr_zone_, global.init, global.type, |
| 1724 | isolate_, instance, thrower_); |
| 1725 | if (thrower_->error()) return; |
| 1726 | |
| 1727 | if (global.type.is_reference()) { |
| 1728 | tagged_globals_->set(global.offset, *value.to_ref()); |
| 1729 | } else { |
| 1730 | value.CopyTo(GetRawUntaggedGlobalPtr<byte>(global)); |
| 1731 | } |
| 1732 | } |
| 1733 | } |
| 1734 | |
| 1735 | // Allocate memory for a module instance as a new JSArrayBuffer. |
| 1736 | bool InstanceBuilder::AllocateMemory() { |
| 1737 | int initial_pages = static_cast<int>(module_->initial_pages); |
| 1738 | int maximum_pages = module_->has_maximum_pages |
| 1739 | ? static_cast<int>(module_->maximum_pages) |
| 1740 | : WasmMemoryObject::kNoMaximum; |
| 1741 | auto shared = (module_->has_shared_memory && enabled_.has_threads()) |
| 1742 | ? SharedFlag::kShared |
| 1743 | : SharedFlag::kNotShared; |
| 1744 | |
| 1745 | if (!WasmMemoryObject::New(isolate_, initial_pages, maximum_pages, shared) |
| 1746 | .ToHandle(&memory_object_)) { |
| 1747 | thrower_->RangeError("Out of memory: wasm memory"); |
| 1748 | return false; |
| 1749 | } |
| 1750 | memory_buffer_ = |
| 1751 | Handle<JSArrayBuffer>(memory_object_->array_buffer(), isolate_); |
| 1752 | return true; |
| 1753 | } |
| 1754 | |
| 1755 | // Process the exports, creating wrappers for functions, tables, memories, |
| 1756 | // globals, and exceptions. |
| 1757 | void InstanceBuilder::ProcessExports(Handle<WasmInstanceObject> instance) { |
| 1758 | std::unordered_map<int, Handle<Object>> imported_globals; |
| 1759 | |
| 1760 | // If an imported WebAssembly function or global gets exported, the export |
| 1761 | // has to be identical to to import. Therefore we cache all imported |
| 1762 | // WebAssembly functions in the instance, and all imported globals in a map |
| 1763 | // here. |
| 1764 | for (int index = 0, end = static_cast<int>(module_->import_table.size()); |
| 1765 | index < end; ++index) { |
| 1766 | const WasmImport& import = module_->import_table[index]; |
| 1767 | if (import.kind == kExternalFunction) { |
| 1768 | Handle<Object> value = sanitized_imports_[index].value; |
| 1769 | if (WasmExternalFunction::IsWasmExternalFunction(*value)) { |
| 1770 | WasmInstanceObject::SetWasmInternalFunction( |
| 1771 | isolate_, instance, import.index, |
| 1772 | WasmInternalFunction::FromExternal( |
| 1773 | Handle<WasmExternalFunction>::cast(value), isolate_) |
| 1774 | .ToHandleChecked()); |
| 1775 | } |
| 1776 | } else if (import.kind == kExternalGlobal) { |
| 1777 | Handle<Object> value = sanitized_imports_[index].value; |
| 1778 | if (value->IsWasmGlobalObject()) { |
| 1779 | imported_globals[import.index] = value; |
| 1780 | } |
| 1781 | } |
| 1782 | } |
| 1783 | |
| 1784 | Handle<JSObject> exports_object; |
| 1785 | MaybeHandle<String> single_function_name; |
| 1786 | bool is_asm_js = is_asmjs_module(module_); |
| 1787 | if (is_asm_js) { |
| 1788 | Handle<JSFunction> object_function = Handle<JSFunction>( |
| 1789 | isolate_->native_context()->object_function(), isolate_); |
| 1790 | exports_object = isolate_->factory()->NewJSObject(object_function); |
| 1791 | single_function_name = |
| 1792 | isolate_->factory()->InternalizeUtf8String(AsmJs::kSingleFunctionName); |
| 1793 | } else { |
| 1794 | exports_object = isolate_->factory()->NewJSObjectWithNullProto(); |
| 1795 | } |
| 1796 | instance->set_exports_object(*exports_object); |
| 1797 | |
| 1798 | PropertyDescriptor desc; |
| 1799 | desc.set_writable(is_asm_js); |
| 1800 | desc.set_enumerable(true); |
| 1801 | desc.set_configurable(is_asm_js); |
| 1802 | |
| 1803 | // Process each export in the export table. |
| 1804 | for (const WasmExport& exp : module_->export_table) { |
| 1805 | Handle<String> name = WasmModuleObject::ExtractUtf8StringFromModuleBytes( |
| 1806 | isolate_, module_object_, exp.name, kInternalize); |
| 1807 | Handle<JSObject> export_to = exports_object; |
| 1808 | switch (exp.kind) { |
| 1809 | case kExternalFunction: { |
| 1810 | // Wrap and export the code as a JSFunction. |
| 1811 | // TODO(wasm): reduce duplication with LoadElemSegment() further below |
| 1812 | Handle<WasmInternalFunction> internal = |
| 1813 | WasmInstanceObject::GetOrCreateWasmInternalFunction( |
| 1814 | isolate_, instance, exp.index); |
| 1815 | Handle<WasmExternalFunction> wasm_external_function = |
| 1816 | handle(WasmExternalFunction::cast(internal->external()), isolate_); |
| 1817 | desc.set_value(wasm_external_function); |
| 1818 | |
| 1819 | if (is_asm_js && |
| 1820 | String::Equals(isolate_, name, |
| 1821 | single_function_name.ToHandleChecked())) { |
| 1822 | export_to = instance; |
| 1823 | } |
| 1824 | break; |
| 1825 | } |
| 1826 | case kExternalTable: { |
| 1827 | desc.set_value(handle(instance->tables().get(exp.index), isolate_)); |
| 1828 | break; |
| 1829 | } |
| 1830 | case kExternalMemory: { |
| 1831 | // Export the memory as a WebAssembly.Memory object. A WasmMemoryObject |
| 1832 | // should already be available if the module has memory, since we always |
| 1833 | // create or import it when building an WasmInstanceObject. |
| 1834 | DCHECK(instance->has_memory_object())((void) 0); |
| 1835 | desc.set_value( |
| 1836 | Handle<WasmMemoryObject>(instance->memory_object(), isolate_)); |
| 1837 | break; |
| 1838 | } |
| 1839 | case kExternalGlobal: { |
| 1840 | const WasmGlobal& global = module_->globals[exp.index]; |
| 1841 | if (global.imported) { |
| 1842 | auto cached_global = imported_globals.find(exp.index); |
| 1843 | if (cached_global != imported_globals.end()) { |
| 1844 | desc.set_value(cached_global->second); |
| 1845 | break; |
| 1846 | } |
| 1847 | } |
| 1848 | Handle<JSArrayBuffer> untagged_buffer; |
| 1849 | Handle<FixedArray> tagged_buffer; |
| 1850 | uint32_t offset; |
| 1851 | |
| 1852 | if (global.mutability && global.imported) { |
| 1853 | Handle<FixedArray> buffers_array( |
| 1854 | instance->imported_mutable_globals_buffers(), isolate_); |
| 1855 | if (global.type.is_reference()) { |
| 1856 | tagged_buffer = handle( |
| 1857 | FixedArray::cast(buffers_array->get(global.index)), isolate_); |
| 1858 | // For externref globals we store the relative offset in the |
| 1859 | // imported_mutable_globals array instead of an absolute address. |
| 1860 | Address addr = instance->imported_mutable_globals()[global.index]; |
| 1861 | DCHECK_LE(addr, static_cast<Address>(((void) 0) |
| 1862 | std::numeric_limits<uint32_t>::max()))((void) 0); |
| 1863 | offset = static_cast<uint32_t>(addr); |
| 1864 | } else { |
| 1865 | untagged_buffer = |
| 1866 | handle(JSArrayBuffer::cast(buffers_array->get(global.index)), |
| 1867 | isolate_); |
| 1868 | Address global_addr = |
| 1869 | instance->imported_mutable_globals()[global.index]; |
| 1870 | |
| 1871 | size_t buffer_size = untagged_buffer->byte_length(); |
| 1872 | Address backing_store = |
| 1873 | reinterpret_cast<Address>(untagged_buffer->backing_store()); |
| 1874 | CHECK(global_addr >= backing_store &&do { if ((__builtin_expect(!!(!(global_addr >= backing_store && global_addr < backing_store + buffer_size)), 0 ))) { V8_Fatal("Check failed: %s.", "global_addr >= backing_store && global_addr < backing_store + buffer_size" ); } } while (false) |
| 1875 | global_addr < backing_store + buffer_size)do { if ((__builtin_expect(!!(!(global_addr >= backing_store && global_addr < backing_store + buffer_size)), 0 ))) { V8_Fatal("Check failed: %s.", "global_addr >= backing_store && global_addr < backing_store + buffer_size" ); } } while (false); |
| 1876 | offset = static_cast<uint32_t>(global_addr - backing_store); |
| 1877 | } |
| 1878 | } else { |
| 1879 | if (global.type.is_reference()) { |
| 1880 | tagged_buffer = handle(instance->tagged_globals_buffer(), isolate_); |
| 1881 | } else { |
| 1882 | untagged_buffer = |
| 1883 | handle(instance->untagged_globals_buffer(), isolate_); |
| 1884 | } |
| 1885 | offset = global.offset; |
| 1886 | } |
| 1887 | |
| 1888 | // Since the global's array untagged_buffer is always provided, |
| 1889 | // allocation should never fail. |
| 1890 | Handle<WasmGlobalObject> global_obj = |
| 1891 | WasmGlobalObject::New(isolate_, instance, untagged_buffer, |
| 1892 | tagged_buffer, global.type, offset, |
| 1893 | global.mutability) |
| 1894 | .ToHandleChecked(); |
| 1895 | desc.set_value(global_obj); |
| 1896 | break; |
| 1897 | } |
| 1898 | case kExternalTag: { |
| 1899 | const WasmTag& tag = module_->tags[exp.index]; |
| 1900 | Handle<WasmTagObject> wrapper = tags_wrappers_[exp.index]; |
| 1901 | if (wrapper.is_null()) { |
| 1902 | Handle<HeapObject> tag_object( |
| 1903 | HeapObject::cast(instance->tags_table().get(exp.index)), |
| 1904 | isolate_); |
| 1905 | wrapper = WasmTagObject::New(isolate_, tag.sig, tag_object); |
| 1906 | tags_wrappers_[exp.index] = wrapper; |
| 1907 | } |
| 1908 | desc.set_value(wrapper); |
| 1909 | break; |
| 1910 | } |
| 1911 | default: |
| 1912 | UNREACHABLE()V8_Fatal("unreachable code"); |
| 1913 | } |
| 1914 | |
| 1915 | v8::Maybe<bool> status = JSReceiver::DefineOwnProperty( |
| 1916 | isolate_, export_to, name, &desc, Just(kThrowOnError)); |
| 1917 | if (!status.IsJust()) { |
| 1918 | DisallowGarbageCollection no_gc; |
| 1919 | TruncatedUserString<> trunc_name(name->GetCharVector<uint8_t>(no_gc)); |
| 1920 | thrower_->LinkError("export of %.*s failed.", trunc_name.length(), |
| 1921 | trunc_name.start()); |
| 1922 | return; |
| 1923 | } |
| 1924 | } |
| 1925 | |
| 1926 | if (module_->origin == kWasmOrigin) { |
| 1927 | v8::Maybe<bool> success = |
| 1928 | JSReceiver::SetIntegrityLevel(exports_object, FROZEN, kDontThrow); |
| 1929 | DCHECK(success.FromMaybe(false))((void) 0); |
| 1930 | USE(success)do { ::v8::base::Use unused_tmp_array_for_use_macro[]{success }; (void)unused_tmp_array_for_use_macro; } while (false); |
| 1931 | } |
| 1932 | } |
| 1933 | |
| 1934 | namespace { |
| 1935 | V8_INLINEinline __attribute__((always_inline)) void SetFunctionTablePlaceholder(Isolate* isolate, |
| 1936 | Handle<WasmInstanceObject> instance, |
| 1937 | Handle<WasmTableObject> table_object, |
| 1938 | uint32_t entry_index, |
| 1939 | uint32_t func_index) { |
| 1940 | const WasmModule* module = instance->module(); |
| 1941 | const WasmFunction* function = &module->functions[func_index]; |
| 1942 | MaybeHandle<WasmInternalFunction> wasm_internal_function = |
| 1943 | WasmInstanceObject::GetWasmInternalFunction(isolate, instance, |
| 1944 | func_index); |
| 1945 | if (wasm_internal_function.is_null()) { |
| 1946 | // No JSFunction entry yet exists for this function. Create a {Tuple2} |
| 1947 | // holding the information to lazily allocate one. |
| 1948 | WasmTableObject::SetFunctionTablePlaceholder( |
| 1949 | isolate, table_object, entry_index, instance, func_index); |
| 1950 | } else { |
| 1951 | table_object->entries().set(entry_index, |
| 1952 | *wasm_internal_function.ToHandleChecked()); |
| 1953 | } |
| 1954 | WasmTableObject::UpdateDispatchTables(isolate, *table_object, entry_index, |
| 1955 | function, *instance); |
| 1956 | } |
| 1957 | |
| 1958 | V8_INLINEinline __attribute__((always_inline)) void SetFunctionTableNullEntry(Isolate* isolate, |
| 1959 | Handle<WasmTableObject> table_object, |
| 1960 | uint32_t entry_index) { |
| 1961 | table_object->entries().set(entry_index, *isolate->factory()->null_value()); |
| 1962 | WasmTableObject::ClearDispatchTables(isolate, table_object, entry_index); |
| 1963 | } |
| 1964 | } // namespace |
| 1965 | |
| 1966 | void InstanceBuilder::InitializeNonDefaultableTables( |
| 1967 | Handle<WasmInstanceObject> instance) { |
| 1968 | for (int table_index = 0; |
| 1969 | table_index < static_cast<int>(module_->tables.size()); ++table_index) { |
| 1970 | const WasmTable& table = module_->tables[table_index]; |
| 1971 | if (!table.type.is_defaultable()) { |
| 1972 | auto table_object = handle( |
| 1973 | WasmTableObject::cast(instance->tables().get(table_index)), isolate_); |
| 1974 | bool is_function_table = IsSubtypeOf(table.type, kWasmFuncRef, module_); |
| 1975 | if (is_function_table && |
| 1976 | table.initial_value.kind() == ConstantExpression::kRefFunc) { |
| 1977 | for (uint32_t entry_index = 0; entry_index < table.initial_size; |
| 1978 | entry_index++) { |
| 1979 | SetFunctionTablePlaceholder(isolate_, instance, table_object, |
| 1980 | entry_index, table.initial_value.index()); |
| 1981 | } |
| 1982 | } else if (is_function_table && |
| 1983 | table.initial_value.kind() == ConstantExpression::kRefNull) { |
| 1984 | for (uint32_t entry_index = 0; entry_index < table.initial_size; |
| 1985 | entry_index++) { |
| 1986 | SetFunctionTableNullEntry(isolate_, table_object, entry_index); |
| 1987 | } |
| 1988 | } else { |
| 1989 | WasmValue value = |
| 1990 | EvaluateInitExpression(&init_expr_zone_, table.initial_value, |
| 1991 | table.type, isolate_, instance, thrower_); |
| 1992 | if (thrower_->error()) return; |
| 1993 | for (uint32_t entry_index = 0; entry_index < table.initial_size; |
| 1994 | entry_index++) { |
| 1995 | WasmTableObject::Set(isolate_, table_object, entry_index, |
| 1996 | value.to_ref()); |
| 1997 | } |
| 1998 | } |
| 1999 | } |
| 2000 | } |
| 2001 | } |
| 2002 | |
| 2003 | namespace { |
| 2004 | bool LoadElemSegmentImpl(Zone* zone, Isolate* isolate, |
| 2005 | Handle<WasmInstanceObject> instance, |
| 2006 | Handle<WasmTableObject> table_object, |
| 2007 | uint32_t table_index, uint32_t segment_index, |
| 2008 | uint32_t dst, uint32_t src, size_t count) { |
| 2009 | DCHECK_LT(segment_index, instance->module()->elem_segments.size())((void) 0); |
| 2010 | auto& elem_segment = instance->module()->elem_segments[segment_index]; |
| 2011 | // TODO(wasm): Move this functionality into wasm-objects, since it is used |
| 2012 | // for both instantiation and in the implementation of the table.init |
| 2013 | // instruction. |
| 2014 | if (!base::IsInBounds<uint64_t>(dst, count, table_object->current_length()) || |
| 2015 | !base::IsInBounds<uint64_t>( |
| 2016 | src, count, |
| 2017 | instance->dropped_elem_segments()[segment_index] == 0 |
| 2018 | ? elem_segment.entries.size() |
| 2019 | : 0)) { |
| 2020 | return false; |
| 2021 | } |
| 2022 | |
| 2023 | bool is_function_table = |
| 2024 | IsSubtypeOf(table_object->type(), kWasmFuncRef, instance->module()); |
| 2025 | |
| 2026 | ErrorThrower thrower(isolate, "LoadElemSegment"); |
| 2027 | |
| 2028 | for (size_t i = 0; i < count; ++i) { |
| 2029 | ConstantExpression entry = elem_segment.entries[src + i]; |
| 2030 | int entry_index = static_cast<int>(dst + i); |
| 2031 | if (is_function_table && entry.kind() == ConstantExpression::kRefFunc) { |
| 2032 | SetFunctionTablePlaceholder(isolate, instance, table_object, entry_index, |
| 2033 | entry.index()); |
| 2034 | } else if (is_function_table && |
| 2035 | entry.kind() == ConstantExpression::kRefNull) { |
| 2036 | SetFunctionTableNullEntry(isolate, table_object, entry_index); |
| 2037 | } else { |
| 2038 | WasmValue value = EvaluateInitExpression(zone, entry, elem_segment.type, |
| 2039 | isolate, instance, &thrower); |
| 2040 | if (thrower.error()) return false; |
| 2041 | WasmTableObject::Set(isolate, table_object, entry_index, value.to_ref()); |
| 2042 | } |
| 2043 | } |
| 2044 | return true; |
| 2045 | } |
| 2046 | } // namespace |
| 2047 | |
| 2048 | void InstanceBuilder::LoadTableSegments(Handle<WasmInstanceObject> instance) { |
| 2049 | for (uint32_t segment_index = 0; |
| 2050 | segment_index < module_->elem_segments.size(); ++segment_index) { |
| 2051 | auto& elem_segment = instance->module()->elem_segments[segment_index]; |
| 2052 | // Passive segments are not copied during instantiation. |
| 2053 | if (elem_segment.status != WasmElemSegment::kStatusActive) continue; |
| 2054 | |
| 2055 | uint32_t table_index = elem_segment.table_index; |
| 2056 | uint32_t dst = |
| 2057 | EvaluateInitExpression(&init_expr_zone_, elem_segment.offset, kWasmI32, |
| 2058 | isolate_, instance, thrower_) |
| 2059 | .to_u32(); |
| 2060 | if (thrower_->error()) return; |
| 2061 | uint32_t src = 0; |
| 2062 | size_t count = elem_segment.entries.size(); |
| 2063 | |
| 2064 | bool success = LoadElemSegmentImpl( |
| 2065 | &init_expr_zone_, isolate_, instance, |
| 2066 | handle(WasmTableObject::cast( |
| 2067 | instance->tables().get(elem_segment.table_index)), |
| 2068 | isolate_), |
| 2069 | table_index, segment_index, dst, src, count); |
| 2070 | // Set the active segments to being already dropped, since table.init on |
| 2071 | // a dropped passive segment and an active segment have the same behavior. |
| 2072 | instance->dropped_elem_segments()[segment_index] = 1; |
| 2073 | if (!success) { |
| 2074 | thrower_->RuntimeError("table initializer is out of bounds"); |
| 2075 | return; |
| 2076 | } |
| 2077 | } |
| 2078 | } |
| 2079 | |
| 2080 | void InstanceBuilder::InitializeTags(Handle<WasmInstanceObject> instance) { |
| 2081 | Handle<FixedArray> tags_table(instance->tags_table(), isolate_); |
| 2082 | for (int index = 0; index < tags_table->length(); ++index) { |
| 2083 | if (!tags_table->get(index).IsUndefined(isolate_)) continue; |
| 2084 | Handle<WasmExceptionTag> tag = WasmExceptionTag::New(isolate_, index); |
| 2085 | tags_table->set(index, *tag); |
| 2086 | } |
| 2087 | } |
| 2088 | |
| 2089 | bool LoadElemSegment(Isolate* isolate, Handle<WasmInstanceObject> instance, |
| 2090 | uint32_t table_index, uint32_t segment_index, uint32_t dst, |
| 2091 | uint32_t src, uint32_t count) { |
| 2092 | AccountingAllocator allocator; |
| 2093 | // This {Zone} will be used only by the temporary WasmFullDecoder allocated |
| 2094 | // down the line from this call. Therefore it is safe to stack-allocate it |
| 2095 | // here. |
| 2096 | Zone zone(&allocator, "LoadElemSegment"); |
| 2097 | return LoadElemSegmentImpl( |
| 2098 | &zone, isolate, instance, |
| 2099 | handle(WasmTableObject::cast(instance->tables().get(table_index)), |
| 2100 | isolate), |
| 2101 | table_index, segment_index, dst, src, count); |
| 2102 | } |
| 2103 | |
| 2104 | } // namespace wasm |
| 2105 | } // namespace internal |
| 2106 | } // namespace v8 |
| 2107 | |
| 2108 | #undef TRACE |