| // Copyright 2015 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <memory> |
| |
| #include "src/base/atomic-utils.h" |
| #include "src/code-stubs.h" |
| #include "src/compiler/wasm-compiler.h" |
| #include "src/debug/interface-types.h" |
| #include "src/macro-assembler.h" |
| #include "src/objects.h" |
| #include "src/property-descriptor.h" |
| #include "src/simulator.h" |
| #include "src/snapshot/snapshot.h" |
| #include "src/v8.h" |
| |
| #include "src/wasm/ast-decoder.h" |
| #include "src/wasm/module-decoder.h" |
| #include "src/wasm/wasm-js.h" |
| #include "src/wasm/wasm-limits.h" |
| #include "src/wasm/wasm-module.h" |
| #include "src/wasm/wasm-objects.h" |
| #include "src/wasm/wasm-result.h" |
| |
| using namespace v8::internal; |
| using namespace v8::internal::wasm; |
| namespace base = v8::base; |
| |
| #define TRACE(...) \ |
| do { \ |
| if (FLAG_trace_wasm_instances) PrintF(__VA_ARGS__); \ |
| } while (false) |
| |
| #define TRACE_CHAIN(instance) \ |
| do { \ |
| instance->PrintInstancesChain(); \ |
| } while (false) |
| |
| namespace { |
| |
| static const int kInvalidSigIndex = -1; |
| static const int kPlaceholderMarker = 1000000000; |
| |
| byte* raw_buffer_ptr(MaybeHandle<JSArrayBuffer> buffer, int offset) { |
| return static_cast<byte*>(buffer.ToHandleChecked()->backing_store()) + offset; |
| } |
| |
| MaybeHandle<String> ExtractStringFromModuleBytes( |
| Isolate* isolate, Handle<WasmCompiledModule> compiled_module, |
| uint32_t offset, uint32_t size) { |
| // TODO(wasm): cache strings from modules if it's a performance win. |
| Handle<SeqOneByteString> module_bytes = compiled_module->module_bytes(); |
| DCHECK_GE(module_bytes->length(), offset); |
| DCHECK_GE(module_bytes->length() - offset, size); |
| Address raw = module_bytes->GetCharsAddress() + offset; |
| if (!unibrow::Utf8::Validate(reinterpret_cast<const byte*>(raw), size)) |
| return {}; // UTF8 decoding error for name. |
| return isolate->factory()->NewStringFromUtf8SubString( |
| module_bytes, static_cast<int>(offset), static_cast<int>(size)); |
| } |
| |
| void ReplaceReferenceInCode(Handle<Code> code, Handle<Object> old_ref, |
| Handle<Object> new_ref) { |
| for (RelocIterator it(*code, 1 << RelocInfo::EMBEDDED_OBJECT); !it.done(); |
| it.next()) { |
| if (it.rinfo()->target_object() == *old_ref) { |
| it.rinfo()->set_target_object(*new_ref); |
| } |
| } |
| } |
| |
| static void MemoryFinalizer(const v8::WeakCallbackInfo<void>& data) { |
| DisallowHeapAllocation no_gc; |
| JSArrayBuffer** p = reinterpret_cast<JSArrayBuffer**>(data.GetParameter()); |
| JSArrayBuffer* buffer = *p; |
| |
| void* memory = buffer->backing_store(); |
| base::OS::Free(memory, |
| RoundUp(kWasmMaxHeapOffset, base::OS::CommitPageSize())); |
| |
| data.GetIsolate()->AdjustAmountOfExternalAllocatedMemory( |
| -buffer->byte_length()->Number()); |
| |
| GlobalHandles::Destroy(reinterpret_cast<Object**>(p)); |
| } |
| |
| #if V8_TARGET_ARCH_64_BIT |
| const bool kGuardRegionsSupported = true; |
| #else |
| const bool kGuardRegionsSupported = false; |
| #endif |
| |
| bool EnableGuardRegions() { |
| return FLAG_wasm_guard_pages && kGuardRegionsSupported; |
| } |
| |
| void* TryAllocateBackingStore(Isolate* isolate, size_t size, |
| bool enable_guard_regions, bool& is_external) { |
| is_external = false; |
| // TODO(eholk): Right now enable_guard_regions has no effect on 32-bit |
| // systems. It may be safer to fail instead, given that other code might do |
| // things that would be unsafe if they expected guard pages where there |
| // weren't any. |
| if (enable_guard_regions && kGuardRegionsSupported) { |
| // TODO(eholk): On Windows we want to make sure we don't commit the guard |
| // pages yet. |
| |
| // We always allocate the largest possible offset into the heap, so the |
| // addressable memory after the guard page can be made inaccessible. |
| const size_t alloc_size = |
| RoundUp(kWasmMaxHeapOffset, base::OS::CommitPageSize()); |
| DCHECK_EQ(0, size % base::OS::CommitPageSize()); |
| |
| // AllocateGuarded makes the whole region inaccessible by default. |
| void* memory = base::OS::AllocateGuarded(alloc_size); |
| if (memory == nullptr) { |
| return nullptr; |
| } |
| |
| // Make the part we care about accessible. |
| base::OS::Unprotect(memory, size); |
| |
| reinterpret_cast<v8::Isolate*>(isolate) |
| ->AdjustAmountOfExternalAllocatedMemory(size); |
| |
| is_external = true; |
| return memory; |
| } else { |
| void* memory = isolate->array_buffer_allocator()->Allocate(size); |
| return memory; |
| } |
| } |
| |
| void RelocateMemoryReferencesInCode(Handle<FixedArray> code_table, |
| Address old_start, Address start, |
| uint32_t prev_size, uint32_t new_size) { |
| for (int i = 0; i < code_table->length(); ++i) { |
| DCHECK(code_table->get(i)->IsCode()); |
| Handle<Code> code = Handle<Code>(Code::cast(code_table->get(i))); |
| AllowDeferredHandleDereference embedding_raw_address; |
| int mask = (1 << RelocInfo::WASM_MEMORY_REFERENCE) | |
| (1 << RelocInfo::WASM_MEMORY_SIZE_REFERENCE); |
| for (RelocIterator it(*code, mask); !it.done(); it.next()) { |
| it.rinfo()->update_wasm_memory_reference(old_start, start, prev_size, |
| new_size); |
| } |
| } |
| } |
| |
| void RelocateGlobals(Handle<FixedArray> code_table, Address old_start, |
| Address globals_start) { |
| for (int i = 0; i < code_table->length(); ++i) { |
| DCHECK(code_table->get(i)->IsCode()); |
| Handle<Code> code = Handle<Code>(Code::cast(code_table->get(i))); |
| AllowDeferredHandleDereference embedding_raw_address; |
| int mask = 1 << RelocInfo::WASM_GLOBAL_REFERENCE; |
| for (RelocIterator it(*code, mask); !it.done(); it.next()) { |
| it.rinfo()->update_wasm_global_reference(old_start, globals_start); |
| } |
| } |
| } |
| |
| Handle<Code> CreatePlaceholder(Factory* factory, uint32_t index, |
| Code::Kind kind) { |
| // Create a placeholder code object and encode the corresponding index in |
| // the {constant_pool_offset} field of the code object. |
| // TODO(titzer): instead of placeholders, use a reloc_info mode. |
| static byte buffer[] = {0, 0, 0, 0}; // fake instructions. |
| static CodeDesc desc = { |
| buffer, arraysize(buffer), arraysize(buffer), 0, 0, nullptr, 0, nullptr}; |
| Handle<Code> code = factory->NewCode(desc, Code::KindField::encode(kind), |
| Handle<Object>::null()); |
| code->set_constant_pool_offset(static_cast<int>(index) + kPlaceholderMarker); |
| return code; |
| } |
| |
| bool LinkFunction(Handle<Code> unlinked, |
| std::vector<Handle<Code>>& code_table) { |
| bool modified = false; |
| int mode_mask = RelocInfo::ModeMask(RelocInfo::CODE_TARGET); |
| AllowDeferredHandleDereference embedding_raw_address; |
| for (RelocIterator it(*unlinked, mode_mask); !it.done(); it.next()) { |
| RelocInfo::Mode mode = it.rinfo()->rmode(); |
| if (RelocInfo::IsCodeTarget(mode)) { |
| Code* target = |
| Code::GetCodeFromTargetAddress(it.rinfo()->target_address()); |
| if (target->constant_pool_offset() < kPlaceholderMarker) continue; |
| switch (target->kind()) { |
| case Code::WASM_FUNCTION: // fall through |
| case Code::WASM_TO_JS_FUNCTION: // fall through |
| case Code::JS_TO_WASM_FUNCTION: { |
| // Patch direct calls to placeholder code objects. |
| uint32_t index = target->constant_pool_offset() - kPlaceholderMarker; |
| Handle<Code> new_target = code_table[index]; |
| if (target != *new_target) { |
| it.rinfo()->set_target_address(new_target->instruction_start(), |
| UPDATE_WRITE_BARRIER, |
| SKIP_ICACHE_FLUSH); |
| modified = true; |
| } |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| } |
| return modified; |
| } |
| |
| void FlushICache(Isolate* isolate, Handle<FixedArray> code_table) { |
| for (int i = 0; i < code_table->length(); ++i) { |
| Handle<Code> code = code_table->GetValueChecked<Code>(isolate, i); |
| Assembler::FlushICache(isolate, code->instruction_start(), |
| code->instruction_size()); |
| } |
| } |
| |
| // Fetches the compilation unit of a wasm function and executes its parallel |
| // phase. |
| bool FetchAndExecuteCompilationUnit( |
| Isolate* isolate, |
| std::vector<compiler::WasmCompilationUnit*>* compilation_units, |
| std::queue<compiler::WasmCompilationUnit*>* executed_units, |
| base::Mutex* result_mutex, base::AtomicNumber<size_t>* next_unit) { |
| DisallowHeapAllocation no_allocation; |
| DisallowHandleAllocation no_handles; |
| DisallowHandleDereference no_deref; |
| DisallowCodeDependencyChange no_dependency_change; |
| |
| // - 1 because AtomicIncrement returns the value after the atomic increment. |
| size_t index = next_unit->Increment(1) - 1; |
| if (index >= compilation_units->size()) { |
| return false; |
| } |
| |
| compiler::WasmCompilationUnit* unit = compilation_units->at(index); |
| if (unit != nullptr) { |
| unit->ExecuteCompilation(); |
| base::LockGuard<base::Mutex> guard(result_mutex); |
| executed_units->push(unit); |
| } |
| return true; |
| } |
| |
| class WasmCompilationTask : public CancelableTask { |
| public: |
| WasmCompilationTask( |
| Isolate* isolate, |
| std::vector<compiler::WasmCompilationUnit*>* compilation_units, |
| std::queue<compiler::WasmCompilationUnit*>* executed_units, |
| base::Semaphore* on_finished, base::Mutex* result_mutex, |
| base::AtomicNumber<size_t>* next_unit) |
| : CancelableTask(isolate), |
| isolate_(isolate), |
| compilation_units_(compilation_units), |
| executed_units_(executed_units), |
| on_finished_(on_finished), |
| result_mutex_(result_mutex), |
| next_unit_(next_unit) {} |
| |
| void RunInternal() override { |
| while (FetchAndExecuteCompilationUnit(isolate_, compilation_units_, |
| executed_units_, result_mutex_, |
| next_unit_)) { |
| } |
| on_finished_->Signal(); |
| } |
| |
| Isolate* isolate_; |
| std::vector<compiler::WasmCompilationUnit*>* compilation_units_; |
| std::queue<compiler::WasmCompilationUnit*>* executed_units_; |
| base::Semaphore* on_finished_; |
| base::Mutex* result_mutex_; |
| base::AtomicNumber<size_t>* next_unit_; |
| }; |
| |
| static void RecordStats(Isolate* isolate, Code* code) { |
| isolate->counters()->wasm_generated_code_size()->Increment(code->body_size()); |
| isolate->counters()->wasm_reloc_size()->Increment( |
| code->relocation_info()->length()); |
| } |
| |
| static void RecordStats(Isolate* isolate, Handle<FixedArray> functions) { |
| DisallowHeapAllocation no_gc; |
| for (int i = 0; i < functions->length(); ++i) { |
| RecordStats(isolate, Code::cast(functions->get(i))); |
| } |
| } |
| |
| Address GetGlobalStartAddressFromCodeTemplate(Object* undefined, |
| JSObject* object) { |
| auto instance = WasmInstanceObject::cast(object); |
| Address old_address = nullptr; |
| if (instance->has_globals_buffer()) { |
| old_address = |
| static_cast<Address>(instance->get_globals_buffer()->backing_store()); |
| } |
| return old_address; |
| } |
| |
| void InitializeParallelCompilation( |
| Isolate* isolate, const std::vector<WasmFunction>& functions, |
| std::vector<compiler::WasmCompilationUnit*>& compilation_units, |
| ModuleBytesEnv& module_env, ErrorThrower* thrower) { |
| for (uint32_t i = FLAG_skip_compiling_wasm_funcs; i < functions.size(); ++i) { |
| const WasmFunction* func = &functions[i]; |
| compilation_units[i] = |
| func->imported ? nullptr : new compiler::WasmCompilationUnit( |
| thrower, isolate, &module_env, func, i); |
| } |
| } |
| |
| uint32_t* StartCompilationTasks( |
| Isolate* isolate, |
| std::vector<compiler::WasmCompilationUnit*>& compilation_units, |
| std::queue<compiler::WasmCompilationUnit*>& executed_units, |
| base::Semaphore* pending_tasks, base::Mutex& result_mutex, |
| base::AtomicNumber<size_t>& next_unit) { |
| const size_t num_tasks = |
| Min(static_cast<size_t>(FLAG_wasm_num_compilation_tasks), |
| V8::GetCurrentPlatform()->NumberOfAvailableBackgroundThreads()); |
| uint32_t* task_ids = new uint32_t[num_tasks]; |
| for (size_t i = 0; i < num_tasks; ++i) { |
| WasmCompilationTask* task = |
| new WasmCompilationTask(isolate, &compilation_units, &executed_units, |
| pending_tasks, &result_mutex, &next_unit); |
| task_ids[i] = task->id(); |
| V8::GetCurrentPlatform()->CallOnBackgroundThread( |
| task, v8::Platform::kShortRunningTask); |
| } |
| return task_ids; |
| } |
| |
| void WaitForCompilationTasks(Isolate* isolate, uint32_t* task_ids, |
| base::Semaphore* pending_tasks) { |
| const size_t num_tasks = |
| Min(static_cast<size_t>(FLAG_wasm_num_compilation_tasks), |
| V8::GetCurrentPlatform()->NumberOfAvailableBackgroundThreads()); |
| for (size_t i = 0; i < num_tasks; ++i) { |
| // If the task has not started yet, then we abort it. Otherwise we wait for |
| // it to finish. |
| if (isolate->cancelable_task_manager()->TryAbort(task_ids[i]) != |
| CancelableTaskManager::kTaskAborted) { |
| pending_tasks->Wait(); |
| } |
| } |
| } |
| |
| void FinishCompilationUnits( |
| std::queue<compiler::WasmCompilationUnit*>& executed_units, |
| std::vector<Handle<Code>>& results, base::Mutex& result_mutex) { |
| while (true) { |
| compiler::WasmCompilationUnit* unit = nullptr; |
| { |
| base::LockGuard<base::Mutex> guard(&result_mutex); |
| if (executed_units.empty()) { |
| break; |
| } |
| unit = executed_units.front(); |
| executed_units.pop(); |
| } |
| int j = unit->index(); |
| results[j] = unit->FinishCompilation(); |
| delete unit; |
| } |
| } |
| |
| void CompileInParallel(Isolate* isolate, ModuleBytesEnv* module_env, |
| std::vector<Handle<Code>>& functions, |
| ErrorThrower* thrower) { |
| const WasmModule* module = module_env->module; |
| // Data structures for the parallel compilation. |
| std::vector<compiler::WasmCompilationUnit*> compilation_units( |
| module->functions.size()); |
| std::queue<compiler::WasmCompilationUnit*> executed_units; |
| |
| //----------------------------------------------------------------------- |
| // For parallel compilation: |
| // 1) The main thread allocates a compilation unit for each wasm function |
| // and stores them in the vector {compilation_units}. |
| // 2) The main thread spawns {WasmCompilationTask} instances which run on |
| // the background threads. |
| // 3.a) The background threads and the main thread pick one compilation |
| // unit at a time and execute the parallel phase of the compilation |
| // unit. After finishing the execution of the parallel phase, the |
| // result is enqueued in {executed_units}. |
| // 3.b) If {executed_units} contains a compilation unit, the main thread |
| // dequeues it and finishes the compilation. |
| // 4) After the parallel phase of all compilation units has started, the |
| // main thread waits for all {WasmCompilationTask} instances to finish. |
| // 5) The main thread finishes the compilation. |
| |
| // Turn on the {CanonicalHandleScope} so that the background threads can |
| // use the node cache. |
| CanonicalHandleScope canonical(isolate); |
| |
| // 1) The main thread allocates a compilation unit for each wasm function |
| // and stores them in the vector {compilation_units}. |
| InitializeParallelCompilation(isolate, module->functions, compilation_units, |
| *module_env, thrower); |
| |
| // Objects for the synchronization with the background threads. |
| base::Mutex result_mutex; |
| base::AtomicNumber<size_t> next_unit( |
| static_cast<size_t>(FLAG_skip_compiling_wasm_funcs)); |
| |
| // 2) The main thread spawns {WasmCompilationTask} instances which run on |
| // the background threads. |
| std::unique_ptr<uint32_t[]> task_ids(StartCompilationTasks( |
| isolate, compilation_units, executed_units, module->pending_tasks.get(), |
| result_mutex, next_unit)); |
| |
| // 3.a) The background threads and the main thread pick one compilation |
| // unit at a time and execute the parallel phase of the compilation |
| // unit. After finishing the execution of the parallel phase, the |
| // result is enqueued in {executed_units}. |
| while (FetchAndExecuteCompilationUnit(isolate, &compilation_units, |
| &executed_units, &result_mutex, |
| &next_unit)) { |
| // 3.b) If {executed_units} contains a compilation unit, the main thread |
| // dequeues it and finishes the compilation unit. Compilation units |
| // are finished concurrently to the background threads to save |
| // memory. |
| FinishCompilationUnits(executed_units, functions, result_mutex); |
| } |
| // 4) After the parallel phase of all compilation units has started, the |
| // main thread waits for all {WasmCompilationTask} instances to finish. |
| WaitForCompilationTasks(isolate, task_ids.get(), module->pending_tasks.get()); |
| // Finish the compilation of the remaining compilation units. |
| FinishCompilationUnits(executed_units, functions, result_mutex); |
| } |
| |
| void CompileSequentially(Isolate* isolate, ModuleBytesEnv* module_env, |
| std::vector<Handle<Code>>& functions, |
| ErrorThrower* thrower) { |
| DCHECK(!thrower->error()); |
| |
| const WasmModule* module = module_env->module; |
| for (uint32_t i = FLAG_skip_compiling_wasm_funcs; |
| i < module->functions.size(); ++i) { |
| const WasmFunction& func = module->functions[i]; |
| if (func.imported) continue; // Imports are compiled at instantiation time. |
| |
| Handle<Code> code = Handle<Code>::null(); |
| // Compile the function. |
| code = compiler::WasmCompilationUnit::CompileWasmFunction( |
| thrower, isolate, module_env, &func); |
| if (code.is_null()) { |
| WasmName str = module_env->GetName(&func); |
| thrower->CompileError("Compilation of #%d:%.*s failed.", i, str.length(), |
| str.start()); |
| break; |
| } |
| // Install the code into the linker table. |
| functions[i] = code; |
| } |
| } |
| |
| void PatchDirectCalls(Handle<FixedArray> old_functions, |
| Handle<FixedArray> new_functions, int start) { |
| DCHECK_EQ(new_functions->length(), old_functions->length()); |
| |
| DisallowHeapAllocation no_gc; |
| std::map<Code*, Code*> old_to_new_code; |
| for (int i = 0; i < new_functions->length(); ++i) { |
| old_to_new_code.insert(std::make_pair(Code::cast(old_functions->get(i)), |
| Code::cast(new_functions->get(i)))); |
| } |
| int mode_mask = RelocInfo::ModeMask(RelocInfo::CODE_TARGET); |
| AllowDeferredHandleDereference embedding_raw_address; |
| for (int i = start; i < new_functions->length(); ++i) { |
| Code* wasm_function = Code::cast(new_functions->get(i)); |
| for (RelocIterator it(wasm_function, mode_mask); !it.done(); it.next()) { |
| Code* old_code = |
| Code::GetCodeFromTargetAddress(it.rinfo()->target_address()); |
| if (old_code->kind() == Code::WASM_TO_JS_FUNCTION || |
| old_code->kind() == Code::WASM_FUNCTION) { |
| auto found = old_to_new_code.find(old_code); |
| DCHECK(found != old_to_new_code.end()); |
| Code* new_code = found->second; |
| if (new_code != old_code) { |
| it.rinfo()->set_target_address(new_code->instruction_start(), |
| UPDATE_WRITE_BARRIER, |
| SKIP_ICACHE_FLUSH); |
| } |
| } |
| } |
| } |
| } |
| |
| static void ResetCompiledModule(Isolate* isolate, WasmInstanceObject* owner, |
| WasmCompiledModule* compiled_module) { |
| TRACE("Resetting %d\n", compiled_module->instance_id()); |
| Object* undefined = *isolate->factory()->undefined_value(); |
| uint32_t old_mem_size = compiled_module->mem_size(); |
| uint32_t default_mem_size = compiled_module->default_mem_size(); |
| Object* mem_start = compiled_module->maybe_ptr_to_memory(); |
| Address old_mem_address = nullptr; |
| Address globals_start = |
| GetGlobalStartAddressFromCodeTemplate(undefined, owner); |
| |
| // Reset function tables. |
| FixedArray* function_tables = nullptr; |
| FixedArray* empty_function_tables = nullptr; |
| if (compiled_module->has_function_tables()) { |
| function_tables = compiled_module->ptr_to_function_tables(); |
| empty_function_tables = compiled_module->ptr_to_empty_function_tables(); |
| compiled_module->set_ptr_to_function_tables(empty_function_tables); |
| } |
| |
| if (old_mem_size > 0) { |
| CHECK_NE(mem_start, undefined); |
| old_mem_address = |
| static_cast<Address>(JSArrayBuffer::cast(mem_start)->backing_store()); |
| } |
| int mode_mask = RelocInfo::ModeMask(RelocInfo::WASM_MEMORY_REFERENCE) | |
| RelocInfo::ModeMask(RelocInfo::WASM_MEMORY_SIZE_REFERENCE) | |
| RelocInfo::ModeMask(RelocInfo::WASM_GLOBAL_REFERENCE) | |
| RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT); |
| |
| // Patch code to update memory references, global references, and function |
| // table references. |
| Object* fct_obj = compiled_module->ptr_to_code_table(); |
| if (fct_obj != nullptr && fct_obj != undefined && |
| (old_mem_size > 0 || globals_start != nullptr || function_tables)) { |
| FixedArray* functions = FixedArray::cast(fct_obj); |
| for (int i = 0; i < functions->length(); ++i) { |
| Code* code = Code::cast(functions->get(i)); |
| bool changed = false; |
| for (RelocIterator it(code, mode_mask); !it.done(); it.next()) { |
| RelocInfo::Mode mode = it.rinfo()->rmode(); |
| if (RelocInfo::IsWasmMemoryReference(mode) || |
| RelocInfo::IsWasmMemorySizeReference(mode)) { |
| it.rinfo()->update_wasm_memory_reference( |
| old_mem_address, nullptr, old_mem_size, default_mem_size); |
| changed = true; |
| } else if (RelocInfo::IsWasmGlobalReference(mode)) { |
| it.rinfo()->update_wasm_global_reference(globals_start, nullptr); |
| changed = true; |
| } else if (RelocInfo::IsEmbeddedObject(mode) && function_tables) { |
| Object* old = it.rinfo()->target_object(); |
| for (int j = 0; j < function_tables->length(); ++j) { |
| if (function_tables->get(j) == old) { |
| it.rinfo()->set_target_object(empty_function_tables->get(j)); |
| changed = true; |
| } |
| } |
| } |
| } |
| if (changed) { |
| Assembler::FlushICache(isolate, code->instruction_start(), |
| code->instruction_size()); |
| } |
| } |
| } |
| compiled_module->reset_memory(); |
| } |
| |
| static void MemoryInstanceFinalizer(Isolate* isolate, |
| WasmInstanceObject* instance) { |
| DisallowHeapAllocation no_gc; |
| // If the memory object is destroyed, nothing needs to be done here. |
| if (!instance->has_memory_object()) return; |
| Handle<WasmInstanceWrapper> instance_wrapper = |
| handle(instance->get_instance_wrapper()); |
| DCHECK(WasmInstanceWrapper::IsWasmInstanceWrapper(*instance_wrapper)); |
| DCHECK(instance_wrapper->has_instance()); |
| bool has_prev = instance_wrapper->has_previous(); |
| bool has_next = instance_wrapper->has_next(); |
| Handle<WasmMemoryObject> memory_object(instance->get_memory_object()); |
| |
| if (!has_prev && !has_next) { |
| memory_object->ResetInstancesLink(isolate); |
| return; |
| } else { |
| Handle<WasmInstanceWrapper> next_wrapper, prev_wrapper; |
| if (!has_prev) { |
| Handle<WasmInstanceWrapper> next_wrapper = |
| instance_wrapper->next_wrapper(); |
| next_wrapper->reset_previous_wrapper(); |
| // As this is the first link in the memory object, destroying |
| // without updating memory object would corrupt the instance chain in |
| // the memory object. |
| memory_object->set_instances_link(*next_wrapper); |
| } else if (!has_next) { |
| instance_wrapper->previous_wrapper()->reset_next_wrapper(); |
| } else { |
| DCHECK(has_next && has_prev); |
| Handle<WasmInstanceWrapper> prev_wrapper = |
| instance_wrapper->previous_wrapper(); |
| Handle<WasmInstanceWrapper> next_wrapper = |
| instance_wrapper->next_wrapper(); |
| prev_wrapper->set_next_wrapper(*next_wrapper); |
| next_wrapper->set_previous_wrapper(*prev_wrapper); |
| } |
| // Reset to avoid dangling pointers |
| instance_wrapper->reset(); |
| } |
| } |
| |
| static void InstanceFinalizer(const v8::WeakCallbackInfo<void>& data) { |
| DisallowHeapAllocation no_gc; |
| JSObject** p = reinterpret_cast<JSObject**>(data.GetParameter()); |
| WasmInstanceObject* owner = reinterpret_cast<WasmInstanceObject*>(*p); |
| Isolate* isolate = reinterpret_cast<Isolate*>(data.GetIsolate()); |
| // Is a link to shared memory instances exists, update the list of memory |
| // instances before the instance is destroyed. |
| if (owner->has_instance_wrapper()) MemoryInstanceFinalizer(isolate, owner); |
| WasmCompiledModule* compiled_module = owner->get_compiled_module(); |
| TRACE("Finalizing %d {\n", compiled_module->instance_id()); |
| DCHECK(compiled_module->has_weak_wasm_module()); |
| WeakCell* weak_wasm_module = compiled_module->ptr_to_weak_wasm_module(); |
| |
| // weak_wasm_module may have been cleared, meaning the module object |
| // was GC-ed. In that case, there won't be any new instances created, |
| // and we don't need to maintain the links between instances. |
| if (!weak_wasm_module->cleared()) { |
| JSObject* wasm_module = JSObject::cast(weak_wasm_module->value()); |
| WasmCompiledModule* current_template = |
| WasmCompiledModule::cast(wasm_module->GetInternalField(0)); |
| |
| TRACE("chain before {\n"); |
| TRACE_CHAIN(current_template); |
| TRACE("}\n"); |
| |
| DCHECK(!current_template->has_weak_prev_instance()); |
| WeakCell* next = compiled_module->maybe_ptr_to_weak_next_instance(); |
| WeakCell* prev = compiled_module->maybe_ptr_to_weak_prev_instance(); |
| |
| if (current_template == compiled_module) { |
| if (next == nullptr) { |
| ResetCompiledModule(isolate, owner, compiled_module); |
| } else { |
| DCHECK(next->value()->IsFixedArray()); |
| wasm_module->SetInternalField(0, next->value()); |
| DCHECK_NULL(prev); |
| WasmCompiledModule::cast(next->value())->reset_weak_prev_instance(); |
| } |
| } else { |
| DCHECK(!(prev == nullptr && next == nullptr)); |
| // the only reason prev or next would be cleared is if the |
| // respective objects got collected, but if that happened, |
| // we would have relinked the list. |
| if (prev != nullptr) { |
| DCHECK(!prev->cleared()); |
| if (next == nullptr) { |
| WasmCompiledModule::cast(prev->value())->reset_weak_next_instance(); |
| } else { |
| WasmCompiledModule::cast(prev->value()) |
| ->set_ptr_to_weak_next_instance(next); |
| } |
| } |
| if (next != nullptr) { |
| DCHECK(!next->cleared()); |
| if (prev == nullptr) { |
| WasmCompiledModule::cast(next->value())->reset_weak_prev_instance(); |
| } else { |
| WasmCompiledModule::cast(next->value()) |
| ->set_ptr_to_weak_prev_instance(prev); |
| } |
| } |
| } |
| TRACE("chain after {\n"); |
| TRACE_CHAIN(WasmCompiledModule::cast(wasm_module->GetInternalField(0))); |
| TRACE("}\n"); |
| } |
| compiled_module->reset_weak_owning_instance(); |
| GlobalHandles::Destroy(reinterpret_cast<Object**>(p)); |
| TRACE("}\n"); |
| } |
| |
| std::pair<int, int> GetFunctionOffsetAndLength( |
| Handle<WasmCompiledModule> compiled_module, int func_index) { |
| WasmModule* module = compiled_module->module(); |
| if (func_index < 0 || |
| static_cast<size_t>(func_index) > module->functions.size()) { |
| return {0, 0}; |
| } |
| WasmFunction& func = module->functions[func_index]; |
| return {static_cast<int>(func.code_start_offset), |
| static_cast<int>(func.code_end_offset - func.code_start_offset)}; |
| } |
| |
| } // namespace |
| |
| Handle<JSArrayBuffer> wasm::NewArrayBuffer(Isolate* isolate, size_t size, |
| bool enable_guard_regions) { |
| if (size > (kV8MaxWasmMemoryPages * WasmModule::kPageSize)) { |
| // TODO(titzer): lift restriction on maximum memory allocated here. |
| return Handle<JSArrayBuffer>::null(); |
| } |
| |
| enable_guard_regions = enable_guard_regions && kGuardRegionsSupported; |
| |
| bool is_external; // Set by TryAllocateBackingStore |
| void* memory = |
| TryAllocateBackingStore(isolate, size, enable_guard_regions, is_external); |
| |
| if (memory == nullptr) { |
| return Handle<JSArrayBuffer>::null(); |
| } |
| |
| #if DEBUG |
| // Double check the API allocator actually zero-initialized the memory. |
| const byte* bytes = reinterpret_cast<const byte*>(memory); |
| for (size_t i = 0; i < size; ++i) { |
| DCHECK_EQ(0, bytes[i]); |
| } |
| #endif |
| |
| Handle<JSArrayBuffer> buffer = isolate->factory()->NewJSArrayBuffer(); |
| JSArrayBuffer::Setup(buffer, isolate, is_external, memory, |
| static_cast<int>(size)); |
| buffer->set_is_neuterable(false); |
| buffer->set_has_guard_region(enable_guard_regions); |
| |
| if (is_external) { |
| // We mark the buffer as external if we allocated it here with guard |
| // pages. That means we need to arrange for it to be freed. |
| |
| // TODO(eholk): Finalizers may not run when the main thread is shutting |
| // down, which means we may leak memory here. |
| Handle<Object> global_handle = isolate->global_handles()->Create(*buffer); |
| GlobalHandles::MakeWeak(global_handle.location(), global_handle.location(), |
| &MemoryFinalizer, v8::WeakCallbackType::kFinalizer); |
| } |
| |
| return buffer; |
| } |
| |
| const char* wasm::SectionName(WasmSectionCode code) { |
| switch (code) { |
| case kUnknownSectionCode: |
| return "Unknown"; |
| case kTypeSectionCode: |
| return "Type"; |
| case kImportSectionCode: |
| return "Import"; |
| case kFunctionSectionCode: |
| return "Function"; |
| case kTableSectionCode: |
| return "Table"; |
| case kMemorySectionCode: |
| return "Memory"; |
| case kGlobalSectionCode: |
| return "Global"; |
| case kExportSectionCode: |
| return "Export"; |
| case kStartSectionCode: |
| return "Start"; |
| case kCodeSectionCode: |
| return "Code"; |
| case kElementSectionCode: |
| return "Element"; |
| case kDataSectionCode: |
| return "Data"; |
| case kNameSectionCode: |
| return "Name"; |
| default: |
| return "<unknown>"; |
| } |
| } |
| |
| std::ostream& wasm::operator<<(std::ostream& os, const WasmModule& module) { |
| os << "WASM module with "; |
| os << (module.min_mem_pages * module.kPageSize) << " min mem"; |
| os << (module.max_mem_pages * module.kPageSize) << " max mem"; |
| os << module.functions.size() << " functions"; |
| os << module.functions.size() << " globals"; |
| os << module.functions.size() << " data segments"; |
| return os; |
| } |
| |
| std::ostream& wasm::operator<<(std::ostream& os, const WasmFunction& function) { |
| os << "WASM function with signature " << *function.sig; |
| |
| os << " code bytes: " |
| << (function.code_end_offset - function.code_start_offset); |
| return os; |
| } |
| |
| std::ostream& wasm::operator<<(std::ostream& os, const WasmFunctionName& name) { |
| os << "#" << name.function_->func_index; |
| if (name.function_->name_offset > 0) { |
| if (name.name_.start()) { |
| os << ":"; |
| os.write(name.name_.start(), name.name_.length()); |
| } |
| } else { |
| os << "?"; |
| } |
| return os; |
| } |
| |
| WasmInstanceObject* wasm::GetOwningWasmInstance(Code* code) { |
| DCHECK(code->kind() == Code::WASM_FUNCTION); |
| DisallowHeapAllocation no_gc; |
| FixedArray* deopt_data = code->deoptimization_data(); |
| DCHECK_NOT_NULL(deopt_data); |
| DCHECK(deopt_data->length() == 2); |
| Object* weak_link = deopt_data->get(0); |
| if (!weak_link->IsWeakCell()) return nullptr; |
| WeakCell* cell = WeakCell::cast(weak_link); |
| if (!cell->value()) return nullptr; |
| return WasmInstanceObject::cast(cell->value()); |
| } |
| |
| int wasm::GetFunctionCodeOffset(Handle<WasmCompiledModule> compiled_module, |
| int func_index) { |
| return GetFunctionOffsetAndLength(compiled_module, func_index).first; |
| } |
| |
| WasmModule::WasmModule(Zone* owned) |
| : owned_zone(owned), pending_tasks(new base::Semaphore(0)) {} |
| |
| MaybeHandle<WasmCompiledModule> WasmModule::CompileFunctions( |
| Isolate* isolate, Handle<WasmModuleWrapper> module_wrapper, |
| ErrorThrower* thrower, const ModuleWireBytes& wire_bytes) const { |
| Factory* factory = isolate->factory(); |
| |
| MaybeHandle<WasmCompiledModule> nothing; |
| |
| WasmInstance temp_instance(this); |
| temp_instance.context = isolate->native_context(); |
| temp_instance.mem_size = WasmModule::kPageSize * min_mem_pages; |
| temp_instance.mem_start = nullptr; |
| temp_instance.globals_start = nullptr; |
| |
| // Initialize the indirect tables with placeholders. |
| int function_table_count = static_cast<int>(function_tables.size()); |
| Handle<FixedArray> function_tables = |
| factory->NewFixedArray(function_table_count); |
| for (int i = 0; i < function_table_count; ++i) { |
| temp_instance.function_tables[i] = factory->NewFixedArray(0); |
| function_tables->set(i, *temp_instance.function_tables[i]); |
| } |
| |
| HistogramTimerScope wasm_compile_module_time_scope( |
| isolate->counters()->wasm_compile_module_time()); |
| |
| ModuleBytesEnv module_env(this, &temp_instance, wire_bytes); |
| |
| // The {code_table} array contains import wrappers and functions (which |
| // are both included in {functions.size()}, and export wrappers. |
| int code_table_size = |
| static_cast<int>(functions.size() + num_exported_functions); |
| Handle<FixedArray> code_table = |
| factory->NewFixedArray(static_cast<int>(code_table_size), TENURED); |
| |
| // Initialize the code table with placeholders. |
| for (uint32_t i = 0; i < functions.size(); ++i) { |
| Code::Kind kind = Code::WASM_FUNCTION; |
| if (i < num_imported_functions) kind = Code::WASM_TO_JS_FUNCTION; |
| Handle<Code> placeholder = CreatePlaceholder(factory, i, kind); |
| code_table->set(static_cast<int>(i), *placeholder); |
| temp_instance.function_code[i] = placeholder; |
| } |
| |
| isolate->counters()->wasm_functions_per_module()->AddSample( |
| static_cast<int>(functions.size())); |
| if (!FLAG_trace_wasm_decoder && FLAG_wasm_num_compilation_tasks != 0) { |
| // Avoid a race condition by collecting results into a second vector. |
| std::vector<Handle<Code>> results; |
| results.reserve(temp_instance.function_code.size()); |
| for (size_t i = 0; i < temp_instance.function_code.size(); ++i) { |
| results.push_back(temp_instance.function_code[i]); |
| } |
| CompileInParallel(isolate, &module_env, results, thrower); |
| |
| for (size_t i = 0; i < results.size(); ++i) { |
| temp_instance.function_code[i] = results[i]; |
| } |
| } else { |
| CompileSequentially(isolate, &module_env, temp_instance.function_code, |
| thrower); |
| } |
| if (thrower->error()) return nothing; |
| |
| // At this point, compilation has completed. Update the code table. |
| for (size_t i = FLAG_skip_compiling_wasm_funcs; |
| i < temp_instance.function_code.size(); ++i) { |
| Code* code = *temp_instance.function_code[i]; |
| code_table->set(static_cast<int>(i), code); |
| RecordStats(isolate, code); |
| } |
| |
| // Link the functions in the module. |
| for (size_t i = FLAG_skip_compiling_wasm_funcs; |
| i < temp_instance.function_code.size(); ++i) { |
| Handle<Code> code = temp_instance.function_code[i]; |
| bool modified = LinkFunction(code, temp_instance.function_code); |
| if (modified) { |
| // TODO(mtrofin): do we need to flush the cache here? |
| Assembler::FlushICache(isolate, code->instruction_start(), |
| code->instruction_size()); |
| } |
| } |
| |
| // Create the compiled module object, and populate with compiled functions |
| // and information needed at instantiation time. This object needs to be |
| // serializable. Instantiation may occur off a deserialized version of this |
| // object. |
| Handle<WasmCompiledModule> ret = |
| WasmCompiledModule::New(isolate, module_wrapper); |
| ret->set_code_table(code_table); |
| ret->set_min_mem_pages(min_mem_pages); |
| ret->set_max_mem_pages(max_mem_pages); |
| if (function_table_count > 0) { |
| ret->set_function_tables(function_tables); |
| ret->set_empty_function_tables(function_tables); |
| } |
| |
| // Compile JS->WASM wrappers for exported functions. |
| int func_index = 0; |
| for (auto exp : export_table) { |
| if (exp.kind != kExternalFunction) continue; |
| Handle<Code> wasm_code = |
| code_table->GetValueChecked<Code>(isolate, exp.index); |
| Handle<Code> wrapper_code = |
| compiler::CompileJSToWasmWrapper(isolate, this, wasm_code, exp.index); |
| int export_index = static_cast<int>(functions.size() + func_index); |
| code_table->set(export_index, *wrapper_code); |
| RecordStats(isolate, *wrapper_code); |
| func_index++; |
| } |
| |
| { |
| // TODO(wasm): only save the sections necessary to deserialize a |
| // {WasmModule}. E.g. function bodies could be omitted. |
| Handle<String> module_bytes_string = |
| factory->NewStringFromOneByte(wire_bytes.module_bytes, TENURED) |
| .ToHandleChecked(); |
| DCHECK(module_bytes_string->IsSeqOneByteString()); |
| ret->set_module_bytes(Handle<SeqOneByteString>::cast(module_bytes_string)); |
| } |
| |
| return ret; |
| } |
| |
| static WasmFunction* GetWasmFunctionForImportWrapper(Isolate* isolate, |
| Handle<Object> target) { |
| if (target->IsJSFunction()) { |
| Handle<JSFunction> func = Handle<JSFunction>::cast(target); |
| if (func->code()->kind() == Code::JS_TO_WASM_FUNCTION) { |
| auto exported = Handle<WasmExportedFunction>::cast(func); |
| Handle<WasmInstanceObject> other_instance(exported->instance(), isolate); |
| int func_index = exported->function_index(); |
| return &other_instance->module()->functions[func_index]; |
| } |
| } |
| return nullptr; |
| } |
| |
| static Handle<Code> UnwrapImportWrapper(Handle<Object> target) { |
| Handle<JSFunction> func = Handle<JSFunction>::cast(target); |
| Handle<Code> export_wrapper_code = handle(func->code()); |
| int found = 0; |
| int mask = RelocInfo::ModeMask(RelocInfo::CODE_TARGET); |
| Handle<Code> code; |
| for (RelocIterator it(*export_wrapper_code, mask); !it.done(); it.next()) { |
| RelocInfo* rinfo = it.rinfo(); |
| Address target_address = rinfo->target_address(); |
| Code* target = Code::GetCodeFromTargetAddress(target_address); |
| if (target->kind() == Code::WASM_FUNCTION || |
| target->kind() == Code::WASM_TO_JS_FUNCTION) { |
| ++found; |
| code = handle(target); |
| } |
| } |
| DCHECK(found == 1); |
| return code; |
| } |
| |
| static Handle<Code> CompileImportWrapper(Isolate* isolate, int index, |
| FunctionSig* sig, |
| Handle<JSReceiver> target, |
| Handle<String> module_name, |
| MaybeHandle<String> import_name, |
| ModuleOrigin origin) { |
| Handle<Code> code; |
| WasmFunction* other_func = GetWasmFunctionForImportWrapper(isolate, target); |
| if (other_func) { |
| if (sig->Equals(other_func->sig)) { |
| // Signature matched. Unwrap the JS->WASM wrapper and return the raw |
| // WASM function code. |
| return UnwrapImportWrapper(target); |
| } else { |
| return Handle<Code>::null(); |
| } |
| } else { |
| // Signature mismatch. Compile a new wrapper for the new signature. |
| return compiler::CompileWasmToJSWrapper(isolate, target, sig, index, |
| module_name, import_name, origin); |
| } |
| } |
| |
| static void UpdateDispatchTablesInternal(Isolate* isolate, |
| Handle<FixedArray> dispatch_tables, |
| int index, WasmFunction* function, |
| Handle<Code> code) { |
| DCHECK_EQ(0, dispatch_tables->length() % 3); |
| for (int i = 0; i < dispatch_tables->length(); i += 3) { |
| int table_index = Smi::cast(dispatch_tables->get(i + 1))->value(); |
| Handle<FixedArray> dispatch_table( |
| FixedArray::cast(dispatch_tables->get(i + 2)), isolate); |
| if (function) { |
| // TODO(titzer): the signature might need to be copied to avoid |
| // a dangling pointer in the signature map. |
| Handle<WasmInstanceObject> instance( |
| WasmInstanceObject::cast(dispatch_tables->get(i)), isolate); |
| int sig_index = static_cast<int>( |
| instance->module()->function_tables[table_index].map.FindOrInsert( |
| function->sig)); |
| dispatch_table->set(index, Smi::FromInt(sig_index)); |
| dispatch_table->set(index + (dispatch_table->length() / 2), *code); |
| } else { |
| Code* code = nullptr; |
| dispatch_table->set(index, Smi::FromInt(-1)); |
| dispatch_table->set(index + (dispatch_table->length() / 2), code); |
| } |
| } |
| } |
| |
| void wasm::UpdateDispatchTables(Isolate* isolate, |
| Handle<FixedArray> dispatch_tables, int index, |
| Handle<JSFunction> function) { |
| if (function.is_null()) { |
| UpdateDispatchTablesInternal(isolate, dispatch_tables, index, nullptr, |
| Handle<Code>::null()); |
| } else { |
| UpdateDispatchTablesInternal( |
| isolate, dispatch_tables, index, |
| GetWasmFunctionForImportWrapper(isolate, function), |
| UnwrapImportWrapper(function)); |
| } |
| } |
| |
| // A helper class to simplify instantiating a module from a compiled module. |
| // It closes over the {Isolate}, the {ErrorThrower}, the {WasmCompiledModule}, |
| // etc. |
| class WasmInstanceBuilder { |
| public: |
| WasmInstanceBuilder(Isolate* isolate, ErrorThrower* thrower, |
| Handle<JSObject> module_object, Handle<JSReceiver> ffi, |
| Handle<JSArrayBuffer> memory) |
| : isolate_(isolate), |
| thrower_(thrower), |
| module_object_(module_object), |
| ffi_(ffi), |
| memory_(memory) {} |
| |
| // Build an instance, in all of its glory. |
| MaybeHandle<WasmInstanceObject> Build() { |
| MaybeHandle<WasmInstanceObject> nothing; |
| HistogramTimerScope wasm_instantiate_module_time_scope( |
| isolate_->counters()->wasm_instantiate_module_time()); |
| Factory* factory = isolate_->factory(); |
| |
| //-------------------------------------------------------------------------- |
| // Reuse the compiled module (if no owner), otherwise clone. |
| //-------------------------------------------------------------------------- |
| Handle<FixedArray> code_table; |
| Handle<FixedArray> old_code_table; |
| MaybeHandle<WasmInstanceObject> owner; |
| |
| TRACE("Starting new module instantiation\n"); |
| { |
| // Root the owner, if any, before doing any allocations, which |
| // may trigger GC. |
| // Both owner and original template need to be in sync. Even |
| // after we lose the original template handle, the code |
| // objects we copied from it have data relative to the |
| // instance - such as globals addresses. |
| Handle<WasmCompiledModule> original; |
| { |
| DisallowHeapAllocation no_gc; |
| original = handle( |
| WasmCompiledModule::cast(module_object_->GetInternalField(0))); |
| if (original->has_weak_owning_instance()) { |
| owner = handle(WasmInstanceObject::cast( |
| original->weak_owning_instance()->value())); |
| } |
| } |
| DCHECK(!original.is_null()); |
| // Always make a new copy of the code_table, since the old_code_table |
| // may still have placeholders for imports. |
| old_code_table = original->code_table(); |
| code_table = factory->CopyFixedArray(old_code_table); |
| |
| if (original->has_weak_owning_instance()) { |
| // Clone, but don't insert yet the clone in the instances chain. |
| // We do that last. Since we are holding on to the owner instance, |
| // the owner + original state used for cloning and patching |
| // won't be mutated by possible finalizer runs. |
| DCHECK(!owner.is_null()); |
| TRACE("Cloning from %d\n", original->instance_id()); |
| compiled_module_ = WasmCompiledModule::Clone(isolate_, original); |
| // Avoid creating too many handles in the outer scope. |
| HandleScope scope(isolate_); |
| |
| // Clone the code for WASM functions and exports. |
| for (int i = 0; i < code_table->length(); ++i) { |
| Handle<Code> orig_code = |
| code_table->GetValueChecked<Code>(isolate_, i); |
| switch (orig_code->kind()) { |
| case Code::WASM_TO_JS_FUNCTION: |
| // Imports will be overwritten with newly compiled wrappers. |
| break; |
| case Code::JS_TO_WASM_FUNCTION: |
| case Code::WASM_FUNCTION: { |
| Handle<Code> code = factory->CopyCode(orig_code); |
| code_table->set(i, *code); |
| break; |
| } |
| default: |
| UNREACHABLE(); |
| } |
| } |
| RecordStats(isolate_, code_table); |
| } else { |
| // There was no owner, so we can reuse the original. |
| compiled_module_ = original; |
| TRACE("Reusing existing instance %d\n", |
| compiled_module_->instance_id()); |
| } |
| compiled_module_->set_code_table(code_table); |
| } |
| module_ = reinterpret_cast<WasmModuleWrapper*>( |
| *compiled_module_->module_wrapper()) |
| ->get(); |
| |
| //-------------------------------------------------------------------------- |
| // Allocate the instance object. |
| //-------------------------------------------------------------------------- |
| Handle<WasmInstanceObject> instance = |
| WasmInstanceObject::New(isolate_, compiled_module_); |
| |
| //-------------------------------------------------------------------------- |
| // Set up the globals for the new instance. |
| //-------------------------------------------------------------------------- |
| MaybeHandle<JSArrayBuffer> old_globals; |
| uint32_t globals_size = module_->globals_size; |
| if (globals_size > 0) { |
| const bool enable_guard_regions = false; |
| Handle<JSArrayBuffer> global_buffer = |
| NewArrayBuffer(isolate_, globals_size, enable_guard_regions); |
| globals_ = global_buffer; |
| if (globals_.is_null()) { |
| thrower_->RangeError("Out of memory: wasm globals"); |
| return nothing; |
| } |
| Address old_address = |
| owner.is_null() ? nullptr : GetGlobalStartAddressFromCodeTemplate( |
| isolate_->heap()->undefined_value(), |
| *owner.ToHandleChecked()); |
| RelocateGlobals(code_table, old_address, |
| static_cast<Address>(global_buffer->backing_store())); |
| instance->set_globals_buffer(*global_buffer); |
| } |
| |
| //-------------------------------------------------------------------------- |
| // Prepare for initialization of function tables. |
| //-------------------------------------------------------------------------- |
| int function_table_count = |
| static_cast<int>(module_->function_tables.size()); |
| table_instances_.reserve(module_->function_tables.size()); |
| for (int index = 0; index < function_table_count; ++index) { |
| table_instances_.push_back({Handle<WasmTableObject>::null(), |
| Handle<FixedArray>::null(), |
| Handle<FixedArray>::null()}); |
| } |
| |
| //-------------------------------------------------------------------------- |
| // Process the imports for the module. |
| //-------------------------------------------------------------------------- |
| int num_imported_functions = ProcessImports(code_table, instance); |
| if (num_imported_functions < 0) return nothing; |
| |
| //-------------------------------------------------------------------------- |
| // Process the initialization for the module's globals. |
| //-------------------------------------------------------------------------- |
| InitGlobals(); |
| |
| //-------------------------------------------------------------------------- |
| // Set up the memory for the new instance. |
| //-------------------------------------------------------------------------- |
| MaybeHandle<JSArrayBuffer> old_memory; |
| |
| uint32_t min_mem_pages = module_->min_mem_pages; |
| isolate_->counters()->wasm_min_mem_pages_count()->AddSample(min_mem_pages); |
| |
| if (!memory_.is_null()) { |
| // Set externally passed ArrayBuffer non neuterable. |
| memory_->set_is_neuterable(false); |
| |
| DCHECK_IMPLIES(EnableGuardRegions(), module_->origin == kAsmJsOrigin || |
| memory_->has_guard_region()); |
| } else if (min_mem_pages > 0) { |
| memory_ = AllocateMemory(min_mem_pages); |
| if (memory_.is_null()) return nothing; // failed to allocate memory |
| } |
| |
| if (!memory_.is_null()) { |
| instance->set_memory_buffer(*memory_); |
| Address mem_start = static_cast<Address>(memory_->backing_store()); |
| uint32_t mem_size = |
| static_cast<uint32_t>(memory_->byte_length()->Number()); |
| LoadDataSegments(mem_start, mem_size); |
| |
| uint32_t old_mem_size = compiled_module_->mem_size(); |
| Address old_mem_start = |
| compiled_module_->has_memory() |
| ? static_cast<Address>( |
| compiled_module_->memory()->backing_store()) |
| : nullptr; |
| RelocateMemoryReferencesInCode(code_table, old_mem_start, mem_start, |
| old_mem_size, mem_size); |
| compiled_module_->set_memory(memory_); |
| } else { |
| LoadDataSegments(nullptr, 0); |
| } |
| |
| //-------------------------------------------------------------------------- |
| // Set up the runtime support for the new instance. |
| //-------------------------------------------------------------------------- |
| Handle<WeakCell> weak_link = factory->NewWeakCell(instance); |
| |
| for (int i = num_imported_functions + FLAG_skip_compiling_wasm_funcs; |
| i < code_table->length(); ++i) { |
| Handle<Code> code = code_table->GetValueChecked<Code>(isolate_, i); |
| if (code->kind() == Code::WASM_FUNCTION) { |
| Handle<FixedArray> deopt_data = factory->NewFixedArray(2, TENURED); |
| deopt_data->set(0, *weak_link); |
| deopt_data->set(1, Smi::FromInt(static_cast<int>(i))); |
| deopt_data->set_length(2); |
| code->set_deoptimization_data(*deopt_data); |
| } |
| } |
| |
| //-------------------------------------------------------------------------- |
| // Set up the exports object for the new instance. |
| //-------------------------------------------------------------------------- |
| ProcessExports(code_table, instance); |
| |
| //-------------------------------------------------------------------------- |
| // Add instance to Memory object |
| //-------------------------------------------------------------------------- |
| DCHECK(wasm::IsWasmInstance(*instance)); |
| if (instance->has_memory_object()) { |
| instance->get_memory_object()->AddInstance(isolate_, instance); |
| } |
| |
| //-------------------------------------------------------------------------- |
| // Set up the indirect function tables for the new instance. |
| //-------------------------------------------------------------------------- |
| if (function_table_count > 0) InitializeTables(code_table, instance); |
| |
| if (num_imported_functions > 0 || !owner.is_null()) { |
| // If the code was cloned, or new imports were compiled, patch. |
| PatchDirectCalls(old_code_table, code_table, num_imported_functions); |
| } |
| |
| FlushICache(isolate_, code_table); |
| |
| //-------------------------------------------------------------------------- |
| // Unpack and notify signal handler of protected instructions. |
| //-------------------------------------------------------------------------- |
| { |
| for (int i = 0; i < code_table->length(); ++i) { |
| Handle<Code> code = code_table->GetValueChecked<Code>(isolate_, i); |
| |
| if (code->kind() != Code::WASM_FUNCTION) { |
| continue; |
| } |
| |
| FixedArray* protected_instructions = code->protected_instructions(); |
| |
| Zone zone(isolate_->allocator(), "Wasm Module"); |
| ZoneVector<trap_handler::ProtectedInstructionData> unpacked(&zone); |
| for (int i = 0; i < protected_instructions->length(); |
| i += Code::kTrapDataSize) { |
| trap_handler::ProtectedInstructionData data; |
| data.instr_offset = |
| protected_instructions |
| ->GetValueChecked<Smi>(isolate_, i + Code::kTrapCodeOffset) |
| ->value(); |
| data.landing_offset = |
| protected_instructions |
| ->GetValueChecked<Smi>(isolate_, i + Code::kTrapLandingOffset) |
| ->value(); |
| unpacked.emplace_back(data); |
| } |
| // TODO(eholk): Register the protected instruction information once the |
| // trap handler is in place. |
| } |
| } |
| |
| //-------------------------------------------------------------------------- |
| // Set up and link the new instance. |
| //-------------------------------------------------------------------------- |
| { |
| Handle<Object> global_handle = |
| isolate_->global_handles()->Create(*instance); |
| Handle<WeakCell> link_to_clone = factory->NewWeakCell(compiled_module_); |
| Handle<WeakCell> link_to_owning_instance = factory->NewWeakCell(instance); |
| MaybeHandle<WeakCell> link_to_original; |
| MaybeHandle<WasmCompiledModule> original; |
| if (!owner.is_null()) { |
| // prepare the data needed for publishing in a chain, but don't link |
| // just yet, because |
| // we want all the publishing to happen free from GC interruptions, and |
| // so we do it in |
| // one GC-free scope afterwards. |
| original = handle(owner.ToHandleChecked()->get_compiled_module()); |
| link_to_original = factory->NewWeakCell(original.ToHandleChecked()); |
| } |
| // Publish the new instance to the instances chain. |
| { |
| DisallowHeapAllocation no_gc; |
| if (!link_to_original.is_null()) { |
| compiled_module_->set_weak_next_instance( |
| link_to_original.ToHandleChecked()); |
| original.ToHandleChecked()->set_weak_prev_instance(link_to_clone); |
| compiled_module_->set_weak_wasm_module( |
| original.ToHandleChecked()->weak_wasm_module()); |
| } |
| module_object_->SetInternalField(0, *compiled_module_); |
| compiled_module_->set_weak_owning_instance(link_to_owning_instance); |
| GlobalHandles::MakeWeak(global_handle.location(), |
| global_handle.location(), &InstanceFinalizer, |
| v8::WeakCallbackType::kFinalizer); |
| } |
| } |
| //-------------------------------------------------------------------------- |
| // Run the start function if one was specified. |
| //-------------------------------------------------------------------------- |
| if (module_->start_function_index >= 0) { |
| HandleScope scope(isolate_); |
| int start_index = module_->start_function_index; |
| Handle<Code> startup_code = |
| code_table->GetValueChecked<Code>(isolate_, start_index); |
| FunctionSig* sig = module_->functions[start_index].sig; |
| Handle<Code> wrapper_code = compiler::CompileJSToWasmWrapper( |
| isolate_, module_, startup_code, start_index); |
| Handle<WasmExportedFunction> startup_fct = WasmExportedFunction::New( |
| isolate_, instance, MaybeHandle<String>(), start_index, |
| static_cast<int>(sig->parameter_count()), wrapper_code); |
| RecordStats(isolate_, *startup_code); |
| // Call the JS function. |
| Handle<Object> undefined = factory->undefined_value(); |
| MaybeHandle<Object> retval = |
| Execution::Call(isolate_, startup_fct, undefined, 0, nullptr); |
| |
| if (retval.is_null()) { |
| DCHECK(isolate_->has_pending_exception()); |
| isolate_->OptionalRescheduleException(false); |
| // It's unfortunate that the new instance is already linked in the |
| // chain. However, we need to set up everything before executing the |
| // start function, such that stack trace information can be generated |
| // correctly already in the start function. |
| return nothing; |
| } |
| } |
| |
| DCHECK(!isolate_->has_pending_exception()); |
| TRACE("Finishing instance %d\n", compiled_module_->instance_id()); |
| TRACE_CHAIN(WasmCompiledModule::cast(module_object_->GetInternalField(0))); |
| return instance; |
| } |
| |
| private: |
| // Represents the initialized state of a table. |
| struct TableInstance { |
| Handle<WasmTableObject> table_object; // WebAssembly.Table instance |
| Handle<FixedArray> js_wrappers; // JSFunctions exported |
| Handle<FixedArray> dispatch_table; // internal (code, sig) pairs |
| }; |
| |
| Isolate* isolate_; |
| WasmModule* module_; |
| ErrorThrower* thrower_; |
| Handle<JSObject> module_object_; |
| Handle<JSReceiver> ffi_; |
| Handle<JSArrayBuffer> memory_; |
| Handle<JSArrayBuffer> globals_; |
| Handle<WasmCompiledModule> compiled_module_; |
| std::vector<TableInstance> table_instances_; |
| std::vector<Handle<JSFunction>> js_wrappers_; |
| |
| // Helper routine to print out errors with imports (FFI). |
| MaybeHandle<JSFunction> ReportFFIError(const char* error, uint32_t index, |
| Handle<String> module_name, |
| MaybeHandle<String> function_name) { |
| Handle<String> function_name_handle; |
| if (function_name.ToHandle(&function_name_handle)) { |
| thrower_->TypeError( |
| "Import #%d module=\"%.*s\" function=\"%.*s\" error: %s", index, |
| module_name->length(), module_name->ToCString().get(), |
| function_name_handle->length(), |
| function_name_handle->ToCString().get(), error); |
| } else { |
| thrower_->TypeError("Import #%d module=\"%.*s\" error: %s", index, |
| module_name->length(), module_name->ToCString().get(), |
| error); |
| } |
| thrower_->TypeError("Import "); |
| return MaybeHandle<JSFunction>(); |
| } |
| |
| // Look up an import value in the {ffi_} object. |
| MaybeHandle<Object> LookupImport(uint32_t index, Handle<String> module_name, |
| MaybeHandle<String> import_name) { |
| if (ffi_.is_null()) { |
| return ReportFFIError("FFI is not an object", index, module_name, |
| import_name); |
| } |
| |
| // Look up the module first. |
| MaybeHandle<Object> result = |
| Object::GetPropertyOrElement(ffi_, module_name); |
| if (result.is_null()) { |
| return ReportFFIError("module not found", index, module_name, |
| import_name); |
| } |
| |
| Handle<Object> module = result.ToHandleChecked(); |
| |
| if (!import_name.is_null()) { |
| // Look up the value in the module. |
| if (!module->IsJSReceiver()) { |
| return ReportFFIError("module is not an object or function", index, |
| module_name, import_name); |
| } |
| |
| result = |
| Object::GetPropertyOrElement(module, import_name.ToHandleChecked()); |
| if (result.is_null()) { |
| return ReportFFIError("import not found", index, module_name, |
| import_name); |
| } |
| } else { |
| // No function specified. Use the "default export". |
| result = module; |
| } |
| |
| return result; |
| } |
| |
| uint32_t EvalUint32InitExpr(const WasmInitExpr& expr) { |
| switch (expr.kind) { |
| case WasmInitExpr::kI32Const: |
| return expr.val.i32_const; |
| case WasmInitExpr::kGlobalIndex: { |
| uint32_t offset = module_->globals[expr.val.global_index].offset; |
| return *reinterpret_cast<uint32_t*>(raw_buffer_ptr(globals_, offset)); |
| } |
| default: |
| UNREACHABLE(); |
| return 0; |
| } |
| } |
| |
| // Load data segments into the memory. |
| void LoadDataSegments(Address mem_addr, size_t mem_size) { |
| Handle<SeqOneByteString> module_bytes = compiled_module_->module_bytes(); |
| for (const WasmDataSegment& segment : module_->data_segments) { |
| uint32_t source_size = segment.source_size; |
| // Segments of size == 0 are just nops. |
| if (source_size == 0) continue; |
| uint32_t dest_offset = EvalUint32InitExpr(segment.dest_addr); |
| if (dest_offset >= mem_size || source_size >= mem_size || |
| dest_offset > (mem_size - source_size)) { |
| thrower_->TypeError("data segment (start = %" PRIu32 ", size = %" PRIu32 |
| ") does not fit into memory (size = %" PRIuS ")", |
| dest_offset, source_size, mem_size); |
| return; |
| } |
| byte* dest = mem_addr + dest_offset; |
| const byte* src = reinterpret_cast<const byte*>( |
| module_bytes->GetCharsAddress() + segment.source_offset); |
| memcpy(dest, src, source_size); |
| } |
| } |
| |
| void WriteGlobalValue(WasmGlobal& global, Handle<Object> value) { |
| double num = 0; |
| if (value->IsSmi()) { |
| num = Smi::cast(*value)->value(); |
| } else if (value->IsHeapNumber()) { |
| num = HeapNumber::cast(*value)->value(); |
| } else { |
| UNREACHABLE(); |
| } |
| TRACE("init [globals+%u] = %lf, type = %s\n", global.offset, num, |
| WasmOpcodes::TypeName(global.type)); |
| switch (global.type) { |
| case kAstI32: |
| *GetRawGlobalPtr<int32_t>(global) = static_cast<int32_t>(num); |
| break; |
| case kAstI64: |
| // TODO(titzer): initialization of imported i64 globals. |
| UNREACHABLE(); |
| break; |
| case kAstF32: |
| *GetRawGlobalPtr<float>(global) = static_cast<float>(num); |
| break; |
| case kAstF64: |
| *GetRawGlobalPtr<double>(global) = static_cast<double>(num); |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| } |
| |
| // Process the imports, including functions, tables, globals, and memory, in |
| // order, loading them from the {ffi_} object. Returns the number of imported |
| // functions. |
| int ProcessImports(Handle<FixedArray> code_table, |
| Handle<WasmInstanceObject> instance) { |
| int num_imported_functions = 0; |
| int num_imported_tables = 0; |
| for (int index = 0; index < static_cast<int>(module_->import_table.size()); |
| ++index) { |
| WasmImport& import = module_->import_table[index]; |
| Handle<String> module_name = |
| ExtractStringFromModuleBytes(isolate_, compiled_module_, |
| import.module_name_offset, |
| import.module_name_length) |
| .ToHandleChecked(); |
| Handle<String> function_name = Handle<String>::null(); |
| if (import.field_name_length > 0) { |
| function_name = ExtractStringFromModuleBytes(isolate_, compiled_module_, |
| import.field_name_offset, |
| import.field_name_length) |
| .ToHandleChecked(); |
| } |
| |
| MaybeHandle<Object> result = |
| LookupImport(index, module_name, function_name); |
| if (thrower_->error()) return -1; |
| |
| switch (import.kind) { |
| case kExternalFunction: { |
| // Function imports must be callable. |
| Handle<Object> function = result.ToHandleChecked(); |
| if (!function->IsCallable()) { |
| ReportFFIError("function import requires a callable", index, |
| module_name, function_name); |
| return -1; |
| } |
| |
| Handle<Code> import_wrapper = CompileImportWrapper( |
| isolate_, index, module_->functions[import.index].sig, |
| Handle<JSReceiver>::cast(function), module_name, function_name, |
| module_->origin); |
| if (import_wrapper.is_null()) { |
| ReportFFIError("imported function does not match the expected type", |
| index, module_name, function_name); |
| return -1; |
| } |
| code_table->set(num_imported_functions, *import_wrapper); |
| RecordStats(isolate_, *import_wrapper); |
| num_imported_functions++; |
| break; |
| } |
| case kExternalTable: { |
| Handle<Object> value = result.ToHandleChecked(); |
| if (!WasmJs::IsWasmTableObject(isolate_, value)) { |
| ReportFFIError("table import requires a WebAssembly.Table", index, |
| module_name, function_name); |
| return -1; |
| } |
| WasmIndirectFunctionTable& table = |
| module_->function_tables[num_imported_tables]; |
| TableInstance& table_instance = table_instances_[num_imported_tables]; |
| table_instance.table_object = Handle<WasmTableObject>::cast(value); |
| table_instance.js_wrappers = Handle<FixedArray>( |
| table_instance.table_object->get_functions(), isolate_); |
| |
| // TODO(titzer): import table size must match exactly for now. |
| int table_size = table_instance.js_wrappers->length(); |
| if (table_size != static_cast<int>(table.min_size)) { |
| thrower_->TypeError( |
| "table import %d is wrong size (%d), expected %u", index, |
| table_size, table.min_size); |
| return -1; |
| } |
| |
| // Allocate a new dispatch table. |
| table_instance.dispatch_table = |
| isolate_->factory()->NewFixedArray(table_size * 2); |
| for (int i = 0; i < table_size * 2; ++i) { |
| table_instance.dispatch_table->set(i, |
| Smi::FromInt(kInvalidSigIndex)); |
| } |
| // Initialize the dispatch table with the (foreign) JS functions |
| // that are already in the table. |
| for (int i = 0; i < table_size; ++i) { |
| Handle<Object> val(table_instance.js_wrappers->get(i), isolate_); |
| if (!val->IsJSFunction()) continue; |
| WasmFunction* function = |
| GetWasmFunctionForImportWrapper(isolate_, val); |
| if (function == nullptr) { |
| thrower_->TypeError("table import %d[%d] is not a WASM function", |
| index, i); |
| return -1; |
| } |
| int sig_index = table.map.FindOrInsert(function->sig); |
| table_instance.dispatch_table->set(i, Smi::FromInt(sig_index)); |
| table_instance.dispatch_table->set(i + table_size, |
| *UnwrapImportWrapper(val)); |
| } |
| |
| num_imported_tables++; |
| break; |
| } |
| case kExternalMemory: { |
| Handle<Object> object = result.ToHandleChecked(); |
| if (!WasmJs::IsWasmMemoryObject(isolate_, object)) { |
| ReportFFIError("memory import must be a WebAssembly.Memory object", |
| index, module_name, function_name); |
| return -1; |
| } |
| auto memory = Handle<WasmMemoryObject>::cast(object); |
| DCHECK(WasmJs::IsWasmMemoryObject(isolate_, memory)); |
| instance->set_memory_object(*memory); |
| memory_ = Handle<JSArrayBuffer>(memory->get_buffer(), isolate_); |
| break; |
| } |
| case kExternalGlobal: { |
| // Global imports are converted to numbers and written into the |
| // {globals_} array buffer. |
| Handle<Object> object = result.ToHandleChecked(); |
| MaybeHandle<Object> number = Object::ToNumber(object); |
| if (number.is_null()) { |
| ReportFFIError("global import could not be converted to number", |
| index, module_name, function_name); |
| return -1; |
| } |
| Handle<Object> val = number.ToHandleChecked(); |
| WriteGlobalValue(module_->globals[import.index], val); |
| break; |
| } |
| default: |
| UNREACHABLE(); |
| break; |
| } |
| } |
| return num_imported_functions; |
| } |
| |
| template <typename T> |
| T* GetRawGlobalPtr(WasmGlobal& global) { |
| return reinterpret_cast<T*>(raw_buffer_ptr(globals_, global.offset)); |
| } |
| |
| // Process initialization of globals. |
| void InitGlobals() { |
| for (auto global : module_->globals) { |
| switch (global.init.kind) { |
| case WasmInitExpr::kI32Const: |
| *GetRawGlobalPtr<int32_t>(global) = global.init.val.i32_const; |
| break; |
| case WasmInitExpr::kI64Const: |
| *GetRawGlobalPtr<int64_t>(global) = global.init.val.i64_const; |
| break; |
| case WasmInitExpr::kF32Const: |
| *GetRawGlobalPtr<float>(global) = global.init.val.f32_const; |
| break; |
| case WasmInitExpr::kF64Const: |
| *GetRawGlobalPtr<double>(global) = global.init.val.f64_const; |
| break; |
| case WasmInitExpr::kGlobalIndex: { |
| // Initialize with another global. |
| uint32_t new_offset = global.offset; |
| uint32_t old_offset = |
| module_->globals[global.init.val.global_index].offset; |
| TRACE("init [globals+%u] = [globals+%d]\n", global.offset, |
| old_offset); |
| size_t size = (global.type == kAstI64 || global.type == kAstF64) |
| ? sizeof(double) |
| : sizeof(int32_t); |
| memcpy(raw_buffer_ptr(globals_, new_offset), |
| raw_buffer_ptr(globals_, old_offset), size); |
| break; |
| } |
| case WasmInitExpr::kNone: |
| // Happens with imported globals. |
| break; |
| default: |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| |
| // Allocate memory for a module instance as a new JSArrayBuffer. |
| Handle<JSArrayBuffer> AllocateMemory(uint32_t min_mem_pages) { |
| if (min_mem_pages > kV8MaxWasmMemoryPages) { |
| thrower_->RangeError("Out of memory: wasm memory too large"); |
| return Handle<JSArrayBuffer>::null(); |
| } |
| const bool enable_guard_regions = EnableGuardRegions(); |
| Handle<JSArrayBuffer> mem_buffer = NewArrayBuffer( |
| isolate_, min_mem_pages * WasmModule::kPageSize, enable_guard_regions); |
| |
| if (mem_buffer.is_null()) { |
| thrower_->RangeError("Out of memory: wasm memory"); |
| } |
| return mem_buffer; |
| } |
| |
| // Process the exports, creating wrappers for functions, tables, memories, |
| // and globals. |
| void ProcessExports(Handle<FixedArray> code_table, |
| Handle<WasmInstanceObject> instance) { |
| bool needs_wrappers = module_->num_exported_functions > 0; |
| for (auto table_instance : table_instances_) { |
| if (!table_instance.js_wrappers.is_null()) { |
| needs_wrappers = true; |
| break; |
| } |
| } |
| for (auto table : module_->function_tables) { |
| if (table.exported) { |
| needs_wrappers = true; |
| break; |
| } |
| } |
| if (needs_wrappers) { |
| // Fill the table to cache the exported JSFunction wrappers. |
| js_wrappers_.insert(js_wrappers_.begin(), module_->functions.size(), |
| Handle<JSFunction>::null()); |
| } |
| |
| Handle<JSObject> exports_object = instance; |
| if (module_->export_table.size() > 0 && module_->origin == kWasmOrigin) { |
| // Create the "exports" object. |
| Handle<JSFunction> object_function = Handle<JSFunction>( |
| isolate_->native_context()->object_function(), isolate_); |
| exports_object = |
| isolate_->factory()->NewJSObject(object_function, TENURED); |
| Handle<String> exports_name = |
| isolate_->factory()->InternalizeUtf8String("exports"); |
| JSObject::AddProperty(instance, exports_name, exports_object, READ_ONLY); |
| } |
| |
| PropertyDescriptor desc; |
| desc.set_writable(false); |
| |
| // Process each export in the export table. |
| int export_index = 0; |
| for (auto exp : module_->export_table) { |
| Handle<String> name = |
| ExtractStringFromModuleBytes(isolate_, compiled_module_, |
| exp.name_offset, exp.name_length) |
| .ToHandleChecked(); |
| switch (exp.kind) { |
| case kExternalFunction: { |
| // Wrap and export the code as a JSFunction. |
| WasmFunction& function = module_->functions[exp.index]; |
| int func_index = |
| static_cast<int>(module_->functions.size() + export_index); |
| Handle<JSFunction> js_function = js_wrappers_[exp.index]; |
| if (js_function.is_null()) { |
| // Wrap the exported code as a JSFunction. |
| Handle<Code> export_code = |
| code_table->GetValueChecked<Code>(isolate_, func_index); |
| MaybeHandle<String> func_name; |
| if (module_->origin == kAsmJsOrigin) { |
| // For modules arising from asm.js, honor the names section. |
| func_name = ExtractStringFromModuleBytes( |
| isolate_, compiled_module_, function.name_offset, |
| function.name_length) |
| .ToHandleChecked(); |
| } |
| js_function = WasmExportedFunction::New( |
| isolate_, instance, func_name, function.func_index, |
| static_cast<int>(function.sig->parameter_count()), export_code); |
| js_wrappers_[exp.index] = js_function; |
| } |
| desc.set_value(js_function); |
| export_index++; |
| break; |
| } |
| case kExternalTable: { |
| // Export a table as a WebAssembly.Table object. |
| TableInstance& table_instance = table_instances_[exp.index]; |
| WasmIndirectFunctionTable& table = |
| module_->function_tables[exp.index]; |
| if (table_instance.table_object.is_null()) { |
| uint32_t maximum = |
| table.has_max ? table.max_size : kV8MaxWasmTableSize; |
| table_instance.table_object = WasmTableObject::New( |
| isolate_, table.min_size, maximum, &table_instance.js_wrappers); |
| } |
| desc.set_value(table_instance.table_object); |
| break; |
| } |
| case kExternalMemory: { |
| // Export the memory as a WebAssembly.Memory object. |
| Handle<WasmMemoryObject> memory_object; |
| if (!instance->has_memory_object()) { |
| // If there was no imported WebAssembly.Memory object, create one. |
| Handle<JSArrayBuffer> buffer(instance->get_memory_buffer(), |
| isolate_); |
| memory_object = WasmMemoryObject::New( |
| isolate_, buffer, |
| (module_->max_mem_pages != 0) ? module_->max_mem_pages : -1); |
| instance->set_memory_object(*memory_object); |
| } else { |
| memory_object = Handle<WasmMemoryObject>( |
| instance->get_memory_object(), isolate_); |
| DCHECK(WasmJs::IsWasmMemoryObject(isolate_, memory_object)); |
| memory_object->ResetInstancesLink(isolate_); |
| } |
| |
| desc.set_value(memory_object); |
| break; |
| } |
| case kExternalGlobal: { |
| // Export the value of the global variable as a number. |
| WasmGlobal& global = module_->globals[exp.index]; |
| double num = 0; |
| switch (global.type) { |
| case kAstI32: |
| num = *GetRawGlobalPtr<int32_t>(global); |
| break; |
| case kAstF32: |
| num = *GetRawGlobalPtr<float>(global); |
| break; |
| case kAstF64: |
| num = *GetRawGlobalPtr<double>(global); |
| break; |
| default: |
| UNREACHABLE(); |
| } |
| desc.set_value(isolate_->factory()->NewNumber(num)); |
| break; |
| } |
| default: |
| UNREACHABLE(); |
| break; |
| } |
| |
| v8::Maybe<bool> status = JSReceiver::DefineOwnProperty( |
| isolate_, exports_object, name, &desc, Object::THROW_ON_ERROR); |
| if (!status.IsJust()) { |
| thrower_->TypeError("export of %.*s failed.", name->length(), |
| name->ToCString().get()); |
| return; |
| } |
| } |
| } |
| |
| void InitializeTables(Handle<FixedArray> code_table, |
| Handle<WasmInstanceObject> instance) { |
| Handle<FixedArray> old_function_tables = |
| compiled_module_->function_tables(); |
| int function_table_count = |
| static_cast<int>(module_->function_tables.size()); |
| Handle<FixedArray> new_function_tables = |
| isolate_->factory()->NewFixedArray(function_table_count); |
| for (int index = 0; index < function_table_count; ++index) { |
| WasmIndirectFunctionTable& table = module_->function_tables[index]; |
| TableInstance& table_instance = table_instances_[index]; |
| int table_size = static_cast<int>(table.min_size); |
| |
| if (table_instance.dispatch_table.is_null()) { |
| // Create a new dispatch table if necessary. |
| table_instance.dispatch_table = |
| isolate_->factory()->NewFixedArray(table_size * 2); |
| for (int i = 0; i < table_size; ++i) { |
| // Fill the table with invalid signature indexes so that |
| // uninitialized entries will always fail the signature check. |
| table_instance.dispatch_table->set(i, Smi::FromInt(kInvalidSigIndex)); |
| } |
| } |
| |
| new_function_tables->set(static_cast<int>(index), |
| *table_instance.dispatch_table); |
| |
| Handle<FixedArray> all_dispatch_tables; |
| if (!table_instance.table_object.is_null()) { |
| // Get the existing dispatch table(s) with the WebAssembly.Table object. |
| all_dispatch_tables = WasmTableObject::AddDispatchTable( |
| isolate_, table_instance.table_object, |
| Handle<WasmInstanceObject>::null(), index, |
| Handle<FixedArray>::null()); |
| } |
| |
| // TODO(titzer): this does redundant work if there are multiple tables, |
| // since initializations are not sorted by table index. |
| for (auto table_init : module_->table_inits) { |
| uint32_t base = EvalUint32InitExpr(table_init.offset); |
| if (base > static_cast<uint32_t>(table_size) || |
| (base + table_init.entries.size() > |
| static_cast<uint32_t>(table_size))) { |
| thrower_->CompileError("table initializer is out of bounds"); |
| continue; |
| } |
| for (int i = 0; i < static_cast<int>(table_init.entries.size()); ++i) { |
| uint32_t func_index = table_init.entries[i]; |
| WasmFunction* function = &module_->functions[func_index]; |
| int table_index = static_cast<int>(i + base); |
| int32_t sig_index = table.map.Find(function->sig); |
| DCHECK_GE(sig_index, 0); |
| table_instance.dispatch_table->set(table_index, |
| Smi::FromInt(sig_index)); |
| table_instance.dispatch_table->set(table_index + table_size, |
| code_table->get(func_index)); |
| |
| if (!all_dispatch_tables.is_null()) { |
| Handle<Code> wasm_code(Code::cast(code_table->get(func_index)), |
| isolate_); |
| if (js_wrappers_[func_index].is_null()) { |
| // No JSFunction entry yet exists for this function. Create one. |
| // TODO(titzer): We compile JS->WASM wrappers for functions are |
| // not exported but are in an exported table. This should be done |
| // at module compile time and cached instead. |
| WasmInstance temp_instance(module_); |
| temp_instance.context = isolate_->native_context(); |
| temp_instance.mem_size = 0; |
| temp_instance.mem_start = nullptr; |
| temp_instance.globals_start = nullptr; |
| |
| Handle<Code> wrapper_code = compiler::CompileJSToWasmWrapper( |
| isolate_, module_, wasm_code, func_index); |
| MaybeHandle<String> func_name; |
| if (module_->origin == kAsmJsOrigin) { |
| // For modules arising from asm.js, honor the names section. |
| func_name = ExtractStringFromModuleBytes( |
| isolate_, compiled_module_, |
| function->name_offset, function->name_length) |
| .ToHandleChecked(); |
| } |
| Handle<WasmExportedFunction> js_function = |
| WasmExportedFunction::New( |
| isolate_, instance, func_name, func_index, |
| static_cast<int>(function->sig->parameter_count()), |
| wrapper_code); |
| js_wrappers_[func_index] = js_function; |
| } |
| table_instance.js_wrappers->set(table_index, |
| *js_wrappers_[func_index]); |
| |
| UpdateDispatchTablesInternal(isolate_, all_dispatch_tables, |
| table_index, function, wasm_code); |
| } |
| } |
| } |
| |
| // TODO(titzer): we add the new dispatch table at the end to avoid |
| // redundant work and also because the new instance is not yet fully |
| // initialized. |
| if (!table_instance.table_object.is_null()) { |
| // Add the new dispatch table to the WebAssembly.Table object. |
| all_dispatch_tables = WasmTableObject::AddDispatchTable( |
| isolate_, table_instance.table_object, instance, index, |
| table_instance.dispatch_table); |
| } |
| } |
| // Patch all code that has references to the old indirect tables. |
| for (int i = 0; i < code_table->length(); ++i) { |
| if (!code_table->get(i)->IsCode()) continue; |
| Handle<Code> code(Code::cast(code_table->get(i)), isolate_); |
| for (int j = 0; j < function_table_count; ++j) { |
| ReplaceReferenceInCode( |
| code, Handle<Object>(old_function_tables->get(j), isolate_), |
| Handle<Object>(new_function_tables->get(j), isolate_)); |
| } |
| } |
| compiled_module_->set_function_tables(new_function_tables); |
| } |
| }; |
| |
| // Instantiates a WASM module, creating a WebAssembly.Instance from a |
| // WebAssembly.Module. |
| MaybeHandle<WasmInstanceObject> WasmModule::Instantiate( |
| Isolate* isolate, ErrorThrower* thrower, Handle<JSObject> wasm_module, |
| Handle<JSReceiver> ffi, Handle<JSArrayBuffer> memory) { |
| WasmInstanceBuilder builder(isolate, thrower, wasm_module, ffi, memory); |
| return builder.Build(); |
| } |
| |
| Handle<String> wasm::GetWasmFunctionName(Isolate* isolate, |
| Handle<Object> instance_or_undef, |
| uint32_t func_index) { |
| if (!instance_or_undef->IsUndefined(isolate)) { |
| Handle<WasmCompiledModule> compiled_module( |
| Handle<WasmInstanceObject>::cast(instance_or_undef) |
| ->get_compiled_module()); |
| MaybeHandle<String> maybe_name = |
| WasmCompiledModule::GetFunctionName(compiled_module, func_index); |
| if (!maybe_name.is_null()) return maybe_name.ToHandleChecked(); |
| } |
| return isolate->factory()->NewStringFromStaticChars("<WASM UNNAMED>"); |
| } |
| |
| bool wasm::IsWasmInstance(Object* object) { |
| return WasmInstanceObject::IsWasmInstanceObject(object); |
| } |
| |
| bool wasm::WasmIsAsmJs(Object* instance, Isolate* isolate) { |
| if (instance->IsUndefined(isolate)) return false; |
| DCHECK(IsWasmInstance(instance)); |
| WasmCompiledModule* compiled_module = |
| WasmInstanceObject::cast(instance)->get_compiled_module(); |
| DCHECK_EQ(compiled_module->has_asm_js_offset_table(), |
| compiled_module->script()->type() == Script::TYPE_NORMAL); |
| return compiled_module->has_asm_js_offset_table(); |
| } |
| |
| Handle<Script> wasm::GetScript(Handle<JSObject> instance) { |
| WasmCompiledModule* compiled_module = |
| WasmInstanceObject::cast(*instance)->get_compiled_module(); |
| DCHECK(compiled_module->has_script()); |
| return compiled_module->script(); |
| } |
| |
| Handle<WasmDebugInfo> wasm::GetDebugInfo(Handle<JSObject> object) { |
| auto instance = Handle<WasmInstanceObject>::cast(object); |
| if (instance->has_debug_info()) { |
| Handle<WasmDebugInfo> info(instance->get_debug_info(), |
| instance->GetIsolate()); |
| return info; |
| } |
| Handle<WasmDebugInfo> new_info = WasmDebugInfo::New(instance); |
| instance->set_debug_info(*new_info); |
| return new_info; |
| } |
| |
| // TODO(clemensh): origin can be inferred from asm_js_script; remove it. |
| MaybeHandle<WasmModuleObject> wasm::CreateModuleObjectFromBytes( |
| Isolate* isolate, const byte* start, const byte* end, ErrorThrower* thrower, |
| ModuleOrigin origin, Handle<Script> asm_js_script, |
| const byte* asm_js_offset_tables_start, |
| const byte* asm_js_offset_tables_end) { |
| MaybeHandle<WasmModuleObject> nothing; |
| ModuleResult result = DecodeWasmModule(isolate, start, end, false, origin); |
| if (result.failed()) { |
| if (result.val) delete result.val; |
| thrower->CompileFailed("Wasm decoding failed", result); |
| return nothing; |
| } |
| |
| // The {module_wrapper} will take ownership of the {WasmModule} object, |
| // and it will be destroyed when the GC reclaims the wrapper object. |
| Handle<WasmModuleWrapper> module_wrapper = |
| WasmModuleWrapper::New(isolate, const_cast<WasmModule*>(result.val)); |
| |
| // Compile the functions of the module, producing a compiled module. |
| MaybeHandle<WasmCompiledModule> maybe_compiled_module = |
| result.val->CompileFunctions(isolate, module_wrapper, thrower, |
| ModuleWireBytes(start, end)); |
| |
| if (maybe_compiled_module.is_null()) return nothing; |
| |
| Handle<WasmCompiledModule> compiled_module = |
| maybe_compiled_module.ToHandleChecked(); |
| |
| DCHECK_EQ(origin == kAsmJsOrigin, !asm_js_script.is_null()); |
| DCHECK(!compiled_module->has_script()); |
| DCHECK(!compiled_module->has_asm_js_offset_table()); |
| if (origin == kAsmJsOrigin) { |
| // Set script for the asm.js source, and the offset table mapping wasm byte |
| // offsets to source positions. |
| compiled_module->set_script(asm_js_script); |
| size_t offset_table_len = |
| asm_js_offset_tables_end - asm_js_offset_tables_start; |
| DCHECK_GE(kMaxInt, offset_table_len); |
| Handle<ByteArray> offset_table = |
| isolate->factory()->NewByteArray(static_cast<int>(offset_table_len)); |
| memcpy(offset_table->GetDataStartAddress(), asm_js_offset_tables_start, |
| offset_table_len); |
| compiled_module->set_asm_js_offset_table(offset_table); |
| } else { |
| // Create a new Script object representing this wasm module, store it in the |
| // compiled wasm module, and register it at the debugger. |
| Handle<Script> script = |
| isolate->factory()->NewScript(isolate->factory()->empty_string()); |
| script->set_type(Script::TYPE_WASM); |
| |
| DCHECK_GE(kMaxInt, end - start); |
| int hash = StringHasher::HashSequentialString( |
| reinterpret_cast<const char*>(start), static_cast<int>(end - start), |
| kZeroHashSeed); |
| |
| const int kBufferSize = 50; |
| char buffer[kBufferSize]; |
| int url_chars = SNPrintF(ArrayVector(buffer), "wasm://wasm/%08x", hash); |
| DCHECK(url_chars >= 0 && url_chars < kBufferSize); |
| MaybeHandle<String> url_str = isolate->factory()->NewStringFromOneByte( |
| Vector<const uint8_t>(reinterpret_cast<uint8_t*>(buffer), url_chars), |
| TENURED); |
| script->set_source_url(*url_str.ToHandleChecked()); |
| |
| int name_chars = SNPrintF(ArrayVector(buffer), "wasm-%08x", hash); |
| DCHECK(name_chars >= 0 && name_chars < kBufferSize); |
| MaybeHandle<String> name_str = isolate->factory()->NewStringFromOneByte( |
| Vector<const uint8_t>(reinterpret_cast<uint8_t*>(buffer), name_chars), |
| TENURED); |
| script->set_name(*name_str.ToHandleChecked()); |
| |
| script->set_wasm_compiled_module(*compiled_module); |
| compiled_module->set_script(script); |
| isolate->debug()->OnAfterCompile(script); |
| } |
| |
| return WasmModuleObject::New(isolate, compiled_module); |
| } |
| |
| bool wasm::ValidateModuleBytes(Isolate* isolate, const byte* start, |
| const byte* end, ErrorThrower* thrower, |
| ModuleOrigin origin) { |
| ModuleResult result = DecodeWasmModule(isolate, start, end, true, origin); |
| if (result.val) { |
| delete result.val; |
| } else { |
| DCHECK(!result.ok()); |
| } |
| return result.ok(); |
| } |
| |
| MaybeHandle<JSArrayBuffer> wasm::GetInstanceMemory( |
| Isolate* isolate, Handle<WasmInstanceObject> object) { |
| auto instance = Handle<WasmInstanceObject>::cast(object); |
| if (instance->has_memory_buffer()) { |
| return Handle<JSArrayBuffer>(instance->get_memory_buffer(), isolate); |
| } |
| return MaybeHandle<JSArrayBuffer>(); |
| } |
| |
| void SetInstanceMemory(Handle<WasmInstanceObject> instance, |
| JSArrayBuffer* buffer) { |
| DisallowHeapAllocation no_gc; |
| instance->set_memory_buffer(buffer); |
| instance->get_compiled_module()->set_ptr_to_memory(buffer); |
| } |
| |
| int32_t wasm::GetInstanceMemorySize(Isolate* isolate, |
| Handle<WasmInstanceObject> instance) { |
| DCHECK(IsWasmInstance(*instance)); |
| MaybeHandle<JSArrayBuffer> maybe_mem_buffer = |
| GetInstanceMemory(isolate, instance); |
| Handle<JSArrayBuffer> buffer; |
| if (!maybe_mem_buffer.ToHandle(&buffer)) { |
| return 0; |
| } else { |
| return buffer->byte_length()->Number() / WasmModule::kPageSize; |
| } |
| } |
| |
| uint32_t GetMaxInstanceMemorySize(Isolate* isolate, |
| Handle<WasmInstanceObject> instance) { |
| if (instance->has_memory_object()) { |
| Handle<WasmMemoryObject> memory_object(instance->get_memory_object(), |
| isolate); |
| |
| int maximum = memory_object->maximum_pages(); |
| if (maximum > 0) return static_cast<uint32_t>(maximum); |
| } |
| uint32_t compiled_max_pages = |
| instance->get_compiled_module()->max_mem_pages(); |
| isolate->counters()->wasm_max_mem_pages_count()->AddSample( |
| compiled_max_pages); |
| if (compiled_max_pages != 0) return compiled_max_pages; |
| return kV8MaxWasmMemoryPages; |
| } |
| |
| Handle<JSArrayBuffer> GrowMemoryBuffer(Isolate* isolate, |
| MaybeHandle<JSArrayBuffer> buffer, |
| uint32_t pages, uint32_t max_pages) { |
| Handle<JSArrayBuffer> old_buffer; |
| Address old_mem_start = nullptr; |
| uint32_t old_size = 0; |
| if (buffer.ToHandle(&old_buffer) && old_buffer->backing_store() != nullptr) { |
| old_mem_start = static_cast<Address>(old_buffer->backing_store()); |
| DCHECK_NOT_NULL(old_mem_start); |
| old_size = old_buffer->byte_length()->Number(); |
| } |
| DCHECK(old_size + pages * WasmModule::kPageSize <= |
| std::numeric_limits<uint32_t>::max()); |
| uint32_t new_size = old_size + pages * WasmModule::kPageSize; |
| if (new_size <= old_size || max_pages * WasmModule::kPageSize < new_size || |
| kV8MaxWasmMemoryPages * WasmModule::kPageSize < new_size) { |
| return Handle<JSArrayBuffer>::null(); |
| } |
| |
| Handle<JSArrayBuffer> new_buffer; |
| if (!old_buffer.is_null() && old_buffer->has_guard_region()) { |
| // We don't move the backing store, we simply change the protection to make |
| // more of it accessible. |
| base::OS::Unprotect(old_buffer->backing_store(), new_size); |
| reinterpret_cast<v8::Isolate*>(isolate) |
| ->AdjustAmountOfExternalAllocatedMemory(pages * WasmModule::kPageSize); |
| Handle<Object> new_size_object = |
| isolate->factory()->NewNumberFromSize(new_size); |
| old_buffer->set_byte_length(*new_size_object); |
| new_buffer = old_buffer; |
| } else { |
| const bool enable_guard_regions = false; |
| new_buffer = NewArrayBuffer(isolate, new_size, enable_guard_regions); |
| if (new_buffer.is_null()) return new_buffer; |
| Address new_mem_start = static_cast<Address>(new_buffer->backing_store()); |
| if (old_size != 0) { |
| memcpy(new_mem_start, old_mem_start, old_size); |
| } |
| } |
| return new_buffer; |
| } |
| |
| void UncheckedUpdateInstanceMemory(Isolate* isolate, |
| Handle<WasmInstanceObject> instance, |
| Address old_mem_start, uint32_t old_size) { |
| DCHECK(instance->has_memory_buffer()); |
| Handle<JSArrayBuffer> new_buffer(instance->get_memory_buffer()); |
| uint32_t new_size = new_buffer->byte_length()->Number(); |
| DCHECK(new_size <= std::numeric_limits<uint32_t>::max()); |
| Address new_mem_start = static_cast<Address>(new_buffer->backing_store()); |
| DCHECK_NOT_NULL(new_mem_start); |
| Handle<FixedArray> code_table = instance->get_compiled_module()->code_table(); |
| RelocateMemoryReferencesInCode(code_table, old_mem_start, new_mem_start, |
| old_size, new_size); |
| } |
| |
| int32_t wasm::GrowWebAssemblyMemory(Isolate* isolate, Handle<Object> receiver, |
| uint32_t pages) { |
| DCHECK(WasmJs::IsWasmMemoryObject(isolate, receiver)); |
| Handle<WasmMemoryObject> memory_object = |
| handle(WasmMemoryObject::cast(*receiver)); |
| Handle<WasmInstanceWrapper> instance_wrapper( |
| memory_object->get_instances_link()); |
| DCHECK(WasmInstanceWrapper::IsWasmInstanceWrapper(*instance_wrapper)); |
| DCHECK(instance_wrapper->has_instance()); |
| Handle<WasmInstanceObject> instance = instance_wrapper->instance_object(); |
| DCHECK(IsWasmInstance(*instance)); |
| if (pages == 0) return GetInstanceMemorySize(isolate, instance); |
| uint32_t max_pages = GetMaxInstanceMemorySize(isolate, instance); |
| |
| // Grow memory object buffer and update instances associated with it. |
| MaybeHandle<JSArrayBuffer> memory_buffer = |
| handle(memory_object->get_buffer()); |
| Handle<JSArrayBuffer> old_buffer; |
| uint32_t old_size = 0; |
| Address old_mem_start = nullptr; |
| if (memory_buffer.ToHandle(&old_buffer) && |
| old_buffer->backing_store() != nullptr) { |
| old_size = old_buffer->byte_length()->Number(); |
| old_mem_start = static_cast<Address>(old_buffer->backing_store()); |
| } |
| Handle<JSArrayBuffer> new_buffer = |
| GrowMemoryBuffer(isolate, memory_buffer, pages, max_pages); |
| if (new_buffer.is_null()) return -1; |
| DCHECK(!instance_wrapper->has_previous()); |
| SetInstanceMemory(instance, *new_buffer); |
| UncheckedUpdateInstanceMemory(isolate, instance, old_mem_start, old_size); |
| while (instance_wrapper->has_next()) { |
| instance_wrapper = instance_wrapper->next_wrapper(); |
| DCHECK(WasmInstanceWrapper::IsWasmInstanceWrapper(*instance_wrapper)); |
| Handle<WasmInstanceObject> instance = instance_wrapper->instance_object(); |
| DCHECK(IsWasmInstance(*instance)); |
| SetInstanceMemory(instance, *new_buffer); |
| UncheckedUpdateInstanceMemory(isolate, instance, old_mem_start, old_size); |
| } |
| memory_object->set_buffer(*new_buffer); |
| DCHECK(old_size % WasmModule::kPageSize == 0); |
| return (old_size / WasmModule::kPageSize); |
| } |
| |
| int32_t wasm::GrowMemory(Isolate* isolate, Handle<WasmInstanceObject> instance, |
| uint32_t pages) { |
| if (!IsWasmInstance(*instance)) return -1; |
| if (pages == 0) return GetInstanceMemorySize(isolate, instance); |
| Handle<WasmInstanceObject> instance_obj(WasmInstanceObject::cast(*instance)); |
| if (!instance_obj->has_memory_object()) { |
| // No other instances to grow, grow just the one. |
| MaybeHandle<JSArrayBuffer> instance_buffer = |
| GetInstanceMemory(isolate, instance); |
| Handle<JSArrayBuffer> old_buffer; |
| uint32_t old_size = 0; |
| Address old_mem_start = nullptr; |
| if (instance_buffer.ToHandle(&old_buffer) && |
| old_buffer->backing_store() != nullptr) { |
| old_size = old_buffer->byte_length()->Number(); |
| old_mem_start = static_cast<Address>(old_buffer->backing_store()); |
| } |
| uint32_t max_pages = GetMaxInstanceMemorySize(isolate, instance_obj); |
| Handle<JSArrayBuffer> buffer = |
| GrowMemoryBuffer(isolate, instance_buffer, pages, max_pages); |
| if (buffer.is_null()) return -1; |
| SetInstanceMemory(instance, *buffer); |
| UncheckedUpdateInstanceMemory(isolate, instance, old_mem_start, old_size); |
| DCHECK(old_size % WasmModule::kPageSize == 0); |
| return (old_size / WasmModule::kPageSize); |
| } else { |
| return GrowWebAssemblyMemory( |
| isolate, handle(instance_obj->get_memory_object()), pages); |
| } |
| } |
| |
| void testing::ValidateInstancesChain(Isolate* isolate, |
| Handle<WasmModuleObject> module_obj, |
| int instance_count) { |
| CHECK_GE(instance_count, 0); |
| DisallowHeapAllocation no_gc; |
| WasmCompiledModule* compiled_module = module_obj->get_compiled_module(); |
| CHECK_EQ(JSObject::cast(compiled_module->ptr_to_weak_wasm_module()->value()), |
| *module_obj); |
| Object* prev = nullptr; |
| int found_instances = compiled_module->has_weak_owning_instance() ? 1 : 0; |
| WasmCompiledModule* current_instance = compiled_module; |
| while (current_instance->has_weak_next_instance()) { |
| CHECK((prev == nullptr && !current_instance->has_weak_prev_instance()) || |
| current_instance->ptr_to_weak_prev_instance()->value() == prev); |
| CHECK_EQ(current_instance->ptr_to_weak_wasm_module()->value(), *module_obj); |
| CHECK(IsWasmInstance( |
| current_instance->ptr_to_weak_owning_instance()->value())); |
| prev = current_instance; |
| current_instance = WasmCompiledModule::cast( |
| current_instance->ptr_to_weak_next_instance()->value()); |
| ++found_instances; |
| CHECK_LE(found_instances, instance_count); |
| } |
| CHECK_EQ(found_instances, instance_count); |
| } |
| |
| void testing::ValidateModuleState(Isolate* isolate, |
| Handle<WasmModuleObject> module_obj) { |
| DisallowHeapAllocation no_gc; |
| WasmCompiledModule* compiled_module = module_obj->get_compiled_module(); |
| CHECK(compiled_module->has_weak_wasm_module()); |
| CHECK_EQ(compiled_module->ptr_to_weak_wasm_module()->value(), *module_obj); |
| CHECK(!compiled_module->has_weak_prev_instance()); |
| CHECK(!compiled_module->has_weak_next_instance()); |
| CHECK(!compiled_module->has_weak_owning_instance()); |
| } |
| |
| void testing::ValidateOrphanedInstance(Isolate* isolate, |
| Handle<WasmInstanceObject> instance) { |
| DisallowHeapAllocation no_gc; |
| WasmCompiledModule* compiled_module = instance->get_compiled_module(); |
| CHECK(compiled_module->has_weak_wasm_module()); |
| CHECK(compiled_module->ptr_to_weak_wasm_module()->cleared()); |
| } |
| |
| void WasmCompiledModule::RecreateModuleWrapper(Isolate* isolate, |
| Handle<FixedArray> array) { |
| Handle<WasmCompiledModule> compiled_module( |
| reinterpret_cast<WasmCompiledModule*>(*array), isolate); |
| |
| WasmModule* module = nullptr; |
| { |
| Handle<SeqOneByteString> module_bytes = compiled_module->module_bytes(); |
| // We parse the module again directly from the module bytes, so |
| // the underlying storage must not be moved meanwhile. |
| DisallowHeapAllocation no_allocation; |
| const byte* start = |
| reinterpret_cast<const byte*>(module_bytes->GetCharsAddress()); |
| const byte* end = start + module_bytes->length(); |
| // TODO(titzer): remember the module origin in the compiled_module |
| // For now, we assume serialized modules did not originate from asm.js. |
| ModuleResult result = |
| DecodeWasmModule(isolate, start, end, false, kWasmOrigin); |
| CHECK(result.ok()); |
| CHECK_NOT_NULL(result.val); |
| module = const_cast<WasmModule*>(result.val); |
| } |
| |
| Handle<WasmModuleWrapper> module_wrapper = |
| WasmModuleWrapper::New(isolate, module); |
| |
| compiled_module->set_module_wrapper(module_wrapper); |
| DCHECK(WasmCompiledModule::IsWasmCompiledModule(*compiled_module)); |
| } |
| |
| MaybeHandle<String> WasmCompiledModule::GetFunctionName( |
| Handle<WasmCompiledModule> compiled_module, uint32_t func_index) { |
| DCHECK_LT(func_index, compiled_module->module()->functions.size()); |
| WasmFunction& function = compiled_module->module()->functions[func_index]; |
| Isolate* isolate = compiled_module->GetIsolate(); |
| MaybeHandle<String> string = ExtractStringFromModuleBytes( |
| isolate, compiled_module, function.name_offset, function.name_length); |
| if (!string.is_null()) return string.ToHandleChecked(); |
| return {}; |
| } |