| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/isolate.h" |
| |
| #if !V8_OS_STARBOARD |
| #include <stdlib.h> |
| #endif // V8_OS_STARBOARD |
| |
| #include <fstream> // NOLINT(readability/streams) |
| #include <sstream> |
| |
| #include "src/api.h" |
| #include "src/assembler-inl.h" |
| #include "src/ast/ast-value-factory.h" |
| #include "src/ast/context-slot-cache.h" |
| #include "src/base/adapters.h" |
| #include "src/base/hashmap.h" |
| #include "src/base/platform/platform.h" |
| #include "src/base/sys-info.h" |
| #include "src/base/utils/random-number-generator.h" |
| #include "src/basic-block-profiler.h" |
| #include "src/bootstrapper.h" |
| #include "src/cancelable-task.h" |
| #include "src/code-stubs.h" |
| #include "src/compilation-cache.h" |
| #include "src/compilation-statistics.h" |
| #include "src/compiler-dispatcher/compiler-dispatcher.h" |
| #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h" |
| #include "src/debug/debug.h" |
| #include "src/deoptimizer.h" |
| #include "src/elements.h" |
| #include "src/external-reference-table.h" |
| #include "src/frames-inl.h" |
| #include "src/ic/stub-cache.h" |
| #include "src/interface-descriptors.h" |
| #include "src/interpreter/interpreter.h" |
| #include "src/isolate-inl.h" |
| #include "src/libsampler/sampler.h" |
| #include "src/log.h" |
| #include "src/messages.h" |
| #include "src/objects/frame-array-inl.h" |
| #include "src/profiler/cpu-profiler.h" |
| #include "src/profiler/tracing-cpu-profiler.h" |
| #include "src/prototype.h" |
| #include "src/regexp/regexp-stack.h" |
| #include "src/runtime-profiler.h" |
| #include "src/setup-isolate.h" |
| #include "src/simulator.h" |
| #include "src/snapshot/startup-deserializer.h" |
| #include "src/tracing/tracing-category-observer.h" |
| #include "src/trap-handler/trap-handler.h" |
| #include "src/unicode-cache.h" |
| #include "src/v8.h" |
| #include "src/version.h" |
| #include "src/visitors.h" |
| #include "src/vm-state-inl.h" |
| #include "src/wasm/compilation-manager.h" |
| #include "src/wasm/wasm-code-manager.h" |
| #include "src/wasm/wasm-engine.h" |
| #include "src/wasm/wasm-objects.h" |
| #include "src/zone/accounting-allocator.h" |
| |
| #if V8_OS_STARBOARD |
| #include "src/poems.h" |
| #endif |
| |
| namespace v8 { |
| namespace internal { |
| |
| base::Atomic32 ThreadId::highest_thread_id_ = 0; |
| |
| int ThreadId::AllocateThreadId() { |
| int new_id = base::Relaxed_AtomicIncrement(&highest_thread_id_, 1); |
| return new_id; |
| } |
| |
| |
| int ThreadId::GetCurrentThreadId() { |
| int thread_id = base::Thread::GetThreadLocalInt(Isolate::thread_id_key_); |
| if (thread_id == 0) { |
| thread_id = AllocateThreadId(); |
| base::Thread::SetThreadLocalInt(Isolate::thread_id_key_, thread_id); |
| } |
| return thread_id; |
| } |
| |
| |
| ThreadLocalTop::ThreadLocalTop() { |
| InitializeInternal(); |
| } |
| |
| |
| void ThreadLocalTop::InitializeInternal() { |
| c_entry_fp_ = 0; |
| c_function_ = 0; |
| handler_ = 0; |
| #ifdef USE_SIMULATOR |
| simulator_ = nullptr; |
| #endif |
| js_entry_sp_ = nullptr; |
| external_callback_scope_ = nullptr; |
| current_vm_state_ = EXTERNAL; |
| try_catch_handler_ = nullptr; |
| context_ = nullptr; |
| thread_id_ = ThreadId::Invalid(); |
| external_caught_exception_ = false; |
| failed_access_check_callback_ = nullptr; |
| save_context_ = nullptr; |
| promise_on_stack_ = nullptr; |
| |
| // These members are re-initialized later after deserialization |
| // is complete. |
| pending_exception_ = nullptr; |
| wasm_caught_exception_ = nullptr; |
| rethrowing_message_ = false; |
| pending_message_obj_ = nullptr; |
| scheduled_exception_ = nullptr; |
| microtask_queue_bailout_index_ = -1; |
| microtask_queue_bailout_count_ = 0; |
| } |
| |
| |
| void ThreadLocalTop::Initialize() { |
| InitializeInternal(); |
| #ifdef USE_SIMULATOR |
| simulator_ = Simulator::current(isolate_); |
| #endif |
| thread_id_ = ThreadId::Current(); |
| } |
| |
| |
| void ThreadLocalTop::Free() { |
| wasm_caught_exception_ = nullptr; |
| // Match unmatched PopPromise calls. |
| while (promise_on_stack_) isolate_->PopPromise(); |
| } |
| |
| |
| base::Thread::LocalStorageKey Isolate::isolate_key_; |
| base::Thread::LocalStorageKey Isolate::thread_id_key_; |
| base::Thread::LocalStorageKey Isolate::per_isolate_thread_data_key_; |
| base::LazyMutex Isolate::thread_data_table_mutex_ = LAZY_MUTEX_INITIALIZER; |
| Isolate::ThreadDataTable* Isolate::thread_data_table_ = nullptr; |
| base::Atomic32 Isolate::isolate_counter_ = 0; |
| #if DEBUG |
| base::Atomic32 Isolate::isolate_key_created_ = 0; |
| #endif |
| |
| Isolate::PerIsolateThreadData* |
| Isolate::FindOrAllocatePerThreadDataForThisThread() { |
| ThreadId thread_id = ThreadId::Current(); |
| PerIsolateThreadData* per_thread = nullptr; |
| { |
| base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer()); |
| per_thread = thread_data_table_->Lookup(this, thread_id); |
| if (per_thread == nullptr) { |
| per_thread = new PerIsolateThreadData(this, thread_id); |
| thread_data_table_->Insert(per_thread); |
| } |
| DCHECK(thread_data_table_->Lookup(this, thread_id) == per_thread); |
| } |
| return per_thread; |
| } |
| |
| |
| void Isolate::DiscardPerThreadDataForThisThread() { |
| int thread_id_int = base::Thread::GetThreadLocalInt(Isolate::thread_id_key_); |
| if (thread_id_int) { |
| ThreadId thread_id = ThreadId(thread_id_int); |
| DCHECK(!thread_manager_->mutex_owner_.Equals(thread_id)); |
| base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer()); |
| PerIsolateThreadData* per_thread = |
| thread_data_table_->Lookup(this, thread_id); |
| if (per_thread) { |
| DCHECK(!per_thread->thread_state_); |
| thread_data_table_->Remove(per_thread); |
| } |
| } |
| } |
| |
| |
| Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThisThread() { |
| ThreadId thread_id = ThreadId::Current(); |
| return FindPerThreadDataForThread(thread_id); |
| } |
| |
| |
| Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThread( |
| ThreadId thread_id) { |
| PerIsolateThreadData* per_thread = nullptr; |
| { |
| base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer()); |
| per_thread = thread_data_table_->Lookup(this, thread_id); |
| } |
| return per_thread; |
| } |
| |
| |
| void Isolate::InitializeOncePerProcess() { |
| base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer()); |
| CHECK_NULL(thread_data_table_); |
| isolate_key_ = base::Thread::CreateThreadLocalKey(); |
| #if DEBUG |
| base::Relaxed_Store(&isolate_key_created_, 1); |
| #endif |
| thread_id_key_ = base::Thread::CreateThreadLocalKey(); |
| per_isolate_thread_data_key_ = base::Thread::CreateThreadLocalKey(); |
| thread_data_table_ = new Isolate::ThreadDataTable(); |
| } |
| |
| Address Isolate::get_address_from_id(IsolateAddressId id) { |
| return isolate_addresses_[id]; |
| } |
| |
| char* Isolate::Iterate(RootVisitor* v, char* thread_storage) { |
| ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage); |
| Iterate(v, thread); |
| return thread_storage + sizeof(ThreadLocalTop); |
| } |
| |
| |
| void Isolate::IterateThread(ThreadVisitor* v, char* t) { |
| ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(t); |
| v->VisitThread(this, thread); |
| } |
| |
| void Isolate::Iterate(RootVisitor* v, ThreadLocalTop* thread) { |
| // Visit the roots from the top for a given thread. |
| v->VisitRootPointer(Root::kTop, &thread->pending_exception_); |
| v->VisitRootPointer(Root::kTop, &thread->wasm_caught_exception_); |
| v->VisitRootPointer(Root::kTop, &thread->pending_message_obj_); |
| v->VisitRootPointer(Root::kTop, bit_cast<Object**>(&(thread->context_))); |
| v->VisitRootPointer(Root::kTop, &thread->scheduled_exception_); |
| |
| for (v8::TryCatch* block = thread->try_catch_handler(); block != nullptr; |
| block = block->next_) { |
| v->VisitRootPointer(Root::kTop, bit_cast<Object**>(&(block->exception_))); |
| v->VisitRootPointer(Root::kTop, bit_cast<Object**>(&(block->message_obj_))); |
| } |
| |
| // Iterate over pointers on native execution stack. |
| for (StackFrameIterator it(this, thread); !it.done(); it.Advance()) { |
| it.frame()->Iterate(v); |
| } |
| } |
| |
| void Isolate::Iterate(RootVisitor* v) { |
| ThreadLocalTop* current_t = thread_local_top(); |
| Iterate(v, current_t); |
| } |
| |
| void Isolate::IterateDeferredHandles(RootVisitor* visitor) { |
| for (DeferredHandles* deferred = deferred_handles_head_; deferred != nullptr; |
| deferred = deferred->next_) { |
| deferred->Iterate(visitor); |
| } |
| } |
| |
| |
| #ifdef DEBUG |
| bool Isolate::IsDeferredHandle(Object** handle) { |
| // Each DeferredHandles instance keeps the handles to one job in the |
| // concurrent recompilation queue, containing a list of blocks. Each block |
| // contains kHandleBlockSize handles except for the first block, which may |
| // not be fully filled. |
| // We iterate through all the blocks to see whether the argument handle |
| // belongs to one of the blocks. If so, it is deferred. |
| for (DeferredHandles* deferred = deferred_handles_head_; deferred != nullptr; |
| deferred = deferred->next_) { |
| std::vector<Object**>* blocks = &deferred->blocks_; |
| for (size_t i = 0; i < blocks->size(); i++) { |
| Object** block_limit = (i == 0) ? deferred->first_block_limit_ |
| : blocks->at(i) + kHandleBlockSize; |
| if (blocks->at(i) <= handle && handle < block_limit) return true; |
| } |
| } |
| return false; |
| } |
| #endif // DEBUG |
| |
| |
| void Isolate::RegisterTryCatchHandler(v8::TryCatch* that) { |
| thread_local_top()->set_try_catch_handler(that); |
| } |
| |
| |
| void Isolate::UnregisterTryCatchHandler(v8::TryCatch* that) { |
| DCHECK(thread_local_top()->try_catch_handler() == that); |
| thread_local_top()->set_try_catch_handler(that->next_); |
| } |
| |
| |
| Handle<String> Isolate::StackTraceString() { |
| if (stack_trace_nesting_level_ == 0) { |
| stack_trace_nesting_level_++; |
| HeapStringAllocator allocator; |
| StringStream::ClearMentionedObjectCache(this); |
| StringStream accumulator(&allocator); |
| incomplete_message_ = &accumulator; |
| PrintStack(&accumulator); |
| Handle<String> stack_trace = accumulator.ToString(this); |
| incomplete_message_ = nullptr; |
| stack_trace_nesting_level_ = 0; |
| return stack_trace; |
| } else if (stack_trace_nesting_level_ == 1) { |
| stack_trace_nesting_level_++; |
| base::OS::PrintError( |
| "\n\nAttempt to print stack while printing stack (double fault)\n"); |
| base::OS::PrintError( |
| "If you are lucky you may find a partial stack dump on stdout.\n\n"); |
| incomplete_message_->OutputToStdOut(); |
| return factory()->empty_string(); |
| } else { |
| base::OS::Abort(); |
| // Unreachable |
| return factory()->empty_string(); |
| } |
| } |
| |
| void Isolate::PushStackTraceAndDie(unsigned int magic1, void* ptr1, void* ptr2, |
| unsigned int magic2) { |
| PushStackTraceAndDie(magic1, ptr1, ptr2, nullptr, nullptr, nullptr, nullptr, |
| nullptr, nullptr, magic2); |
| } |
| |
| void Isolate::PushStackTraceAndDie(unsigned int magic1, void* ptr1, void* ptr2, |
| void* ptr3, void* ptr4, void* ptr5, |
| void* ptr6, void* ptr7, void* ptr8, |
| unsigned int magic2) { |
| const int kMaxStackTraceSize = 32 * KB; |
| Handle<String> trace = StackTraceString(); |
| uint8_t buffer[kMaxStackTraceSize]; |
| int length = Min(kMaxStackTraceSize - 1, trace->length()); |
| String::WriteToFlat(*trace, buffer, 0, length); |
| buffer[length] = '\0'; |
| // TODO(dcarney): convert buffer to utf8? |
| base::OS::PrintError( |
| "Stacktrace:" |
| "\n magic1=%x magic2=%x ptr1=%p ptr2=%p ptr3=%p ptr4=%p ptr5=%p " |
| "ptr6=%p ptr7=%p ptr8=%p\n\n%s", |
| magic1, magic2, ptr1, ptr2, ptr3, ptr4, ptr5, ptr6, ptr7, ptr8, |
| reinterpret_cast<char*>(buffer)); |
| PushCodeObjectsAndDie(0xDEADC0DE, ptr1, ptr2, ptr3, ptr4, ptr5, ptr6, ptr7, |
| ptr8, 0xDEADC0DE); |
| } |
| |
| void Isolate::PushCodeObjectsAndDie(unsigned int magic1, void* ptr1, void* ptr2, |
| void* ptr3, void* ptr4, void* ptr5, |
| void* ptr6, void* ptr7, void* ptr8, |
| unsigned int magic2) { |
| const int kMaxCodeObjects = 16; |
| // Mark as volatile to lower the probability of optimizing code_objects |
| // away. The first and last entries are set to the magic markers, making it |
| // easier to spot the array on the stack. |
| void* volatile code_objects[kMaxCodeObjects + 2]; |
| code_objects[0] = reinterpret_cast<void*>(magic1); |
| code_objects[kMaxCodeObjects + 1] = reinterpret_cast<void*>(magic2); |
| StackFrameIterator it(this); |
| int numCodeObjects = 0; |
| for (; !it.done() && numCodeObjects < kMaxCodeObjects; it.Advance()) { |
| code_objects[1 + numCodeObjects++] = it.frame()->unchecked_code(); |
| } |
| |
| // Keep the top raw code object pointers on the stack in the hope that the |
| // corresponding pages end up more frequently in the minidump. |
| base::OS::PrintError( |
| "\nCodeObjects (%p length=%i): 1:%p 2:%p 3:%p 4:%p..." |
| "\n magic1=%x magic2=%x ptr1=%p ptr2=%p ptr3=%p ptr4=%p ptr5=%p " |
| "ptr6=%p ptr7=%p ptr8=%p\n\n", |
| static_cast<void*>(code_objects[0]), numCodeObjects, |
| static_cast<void*>(code_objects[1]), static_cast<void*>(code_objects[2]), |
| static_cast<void*>(code_objects[3]), static_cast<void*>(code_objects[4]), |
| magic1, magic2, ptr1, ptr2, ptr3, ptr4, ptr5, ptr6, ptr7, ptr8); |
| base::OS::Abort(); |
| } |
| |
| namespace { |
| |
| class FrameArrayBuilder { |
| public: |
| FrameArrayBuilder(Isolate* isolate, FrameSkipMode mode, int limit, |
| Handle<Object> caller) |
| : isolate_(isolate), mode_(mode), limit_(limit), caller_(caller) { |
| switch (mode_) { |
| case SKIP_FIRST: |
| skip_next_frame_ = true; |
| break; |
| case SKIP_UNTIL_SEEN: |
| DCHECK(caller_->IsJSFunction()); |
| skip_next_frame_ = true; |
| break; |
| case SKIP_NONE: |
| skip_next_frame_ = false; |
| break; |
| } |
| |
| elements_ = isolate->factory()->NewFrameArray(Min(limit, 10)); |
| } |
| |
| void AppendStandardFrame(StandardFrame* frame) { |
| std::vector<FrameSummary> frames; |
| frame->Summarize(&frames); |
| // A standard frame may include many summarized frames (due to inlining). |
| for (size_t i = frames.size(); i != 0 && !full(); i--) { |
| const auto& summ = frames[i - 1]; |
| if (summ.IsJavaScript()) { |
| //==================================================================== |
| // Handle a JavaScript frame. |
| //==================================================================== |
| const auto& summary = summ.AsJavaScript(); |
| |
| // Filter out internal frames that we do not want to show. |
| if (!IsVisibleInStackTrace(summary.function())) continue; |
| |
| Handle<AbstractCode> abstract_code = summary.abstract_code(); |
| const int offset = summary.code_offset(); |
| |
| bool is_constructor = summary.is_constructor(); |
| // Help CallSite::IsConstructor correctly detect hand-written |
| // construct stubs. |
| if (abstract_code->IsCode() && |
| Code::cast(*abstract_code)->is_construct_stub()) { |
| is_constructor = true; |
| } |
| |
| int flags = 0; |
| Handle<JSFunction> function = summary.function(); |
| if (IsStrictFrame(function)) flags |= FrameArray::kIsStrict; |
| if (is_constructor) flags |= FrameArray::kIsConstructor; |
| |
| elements_ = FrameArray::AppendJSFrame( |
| elements_, TheHoleToUndefined(isolate_, summary.receiver()), |
| function, abstract_code, offset, flags); |
| } else if (summ.IsWasmCompiled()) { |
| //==================================================================== |
| // Handle a WASM compiled frame. |
| //==================================================================== |
| const auto& summary = summ.AsWasmCompiled(); |
| if (!summary.code().IsCodeObject() && |
| summary.code().GetWasmCode()->kind() != wasm::WasmCode::kFunction) { |
| continue; |
| } |
| Handle<WasmInstanceObject> instance = summary.wasm_instance(); |
| int flags = 0; |
| if (instance->compiled_module()->shared()->is_asm_js()) { |
| flags |= FrameArray::kIsAsmJsWasmFrame; |
| if (WasmCompiledFrame::cast(frame)->at_to_number_conversion()) { |
| flags |= FrameArray::kAsmJsAtNumberConversion; |
| } |
| } else { |
| flags |= FrameArray::kIsWasmFrame; |
| } |
| |
| elements_ = FrameArray::AppendWasmFrame( |
| elements_, instance, summary.function_index(), summary.code(), |
| summary.code_offset(), flags); |
| } else if (summ.IsWasmInterpreted()) { |
| //==================================================================== |
| // Handle a WASM interpreted frame. |
| //==================================================================== |
| const auto& summary = summ.AsWasmInterpreted(); |
| Handle<WasmInstanceObject> instance = summary.wasm_instance(); |
| int flags = FrameArray::kIsWasmInterpretedFrame; |
| DCHECK(!instance->compiled_module()->shared()->is_asm_js()); |
| elements_ = FrameArray::AppendWasmFrame(elements_, instance, |
| summary.function_index(), {}, |
| summary.byte_offset(), flags); |
| } |
| } |
| } |
| |
| void AppendBuiltinExitFrame(BuiltinExitFrame* exit_frame) { |
| Handle<JSFunction> function = handle(exit_frame->function(), isolate_); |
| |
| // Filter out internal frames that we do not want to show. |
| if (!IsVisibleInStackTrace(function)) return; |
| |
| Handle<Object> receiver(exit_frame->receiver(), isolate_); |
| Handle<Code> code(exit_frame->LookupCode(), isolate_); |
| const int offset = |
| static_cast<int>(exit_frame->pc() - code->instruction_start()); |
| |
| int flags = 0; |
| if (IsStrictFrame(function)) flags |= FrameArray::kIsStrict; |
| if (exit_frame->IsConstructor()) flags |= FrameArray::kIsConstructor; |
| |
| elements_ = FrameArray::AppendJSFrame(elements_, receiver, function, |
| Handle<AbstractCode>::cast(code), |
| offset, flags); |
| } |
| |
| bool full() { return elements_->FrameCount() >= limit_; } |
| |
| Handle<FrameArray> GetElements() { |
| elements_->ShrinkToFit(); |
| return elements_; |
| } |
| |
| private: |
| // Poison stack frames below the first strict mode frame. |
| // The stack trace API should not expose receivers and function |
| // objects on frames deeper than the top-most one with a strict mode |
| // function. |
| bool IsStrictFrame(Handle<JSFunction> function) { |
| if (!encountered_strict_function_) { |
| encountered_strict_function_ = |
| is_strict(function->shared()->language_mode()); |
| } |
| return encountered_strict_function_; |
| } |
| |
| // Determines whether the given stack frame should be displayed in a stack |
| // trace. |
| bool IsVisibleInStackTrace(Handle<JSFunction> function) { |
| return ShouldIncludeFrame(function) && IsNotHidden(function) && |
| IsInSameSecurityContext(function); |
| } |
| |
| // This mechanism excludes a number of uninteresting frames from the stack |
| // trace. This can be be the first frame (which will be a builtin-exit frame |
| // for the error constructor builtin) or every frame until encountering a |
| // user-specified function. |
| bool ShouldIncludeFrame(Handle<JSFunction> function) { |
| switch (mode_) { |
| case SKIP_NONE: |
| return true; |
| case SKIP_FIRST: |
| if (!skip_next_frame_) return true; |
| skip_next_frame_ = false; |
| return false; |
| case SKIP_UNTIL_SEEN: |
| if (skip_next_frame_ && (*function == *caller_)) { |
| skip_next_frame_ = false; |
| return false; |
| } |
| return !skip_next_frame_; |
| } |
| UNREACHABLE(); |
| } |
| |
| bool IsNotHidden(Handle<JSFunction> function) { |
| // Functions defined not in user scripts are not visible unless directly |
| // exposed, in which case the native flag is set. |
| // The --builtins-in-stack-traces command line flag allows including |
| // internal call sites in the stack trace for debugging purposes. |
| if (!FLAG_builtins_in_stack_traces && |
| !function->shared()->IsUserJavaScript()) { |
| return function->shared()->native(); |
| } |
| return true; |
| } |
| |
| bool IsInSameSecurityContext(Handle<JSFunction> function) { |
| return isolate_->context()->HasSameSecurityTokenAs(function->context()); |
| } |
| |
| // TODO(jgruber): Fix all cases in which frames give us a hole value (e.g. the |
| // receiver in RegExp constructor frames. |
| Handle<Object> TheHoleToUndefined(Isolate* isolate, Handle<Object> in) { |
| return (in->IsTheHole(isolate)) |
| ? Handle<Object>::cast(isolate->factory()->undefined_value()) |
| : in; |
| } |
| |
| Isolate* isolate_; |
| const FrameSkipMode mode_; |
| int limit_; |
| const Handle<Object> caller_; |
| bool skip_next_frame_ = true; |
| bool encountered_strict_function_ = false; |
| Handle<FrameArray> elements_; |
| }; |
| |
| bool GetStackTraceLimit(Isolate* isolate, int* result) { |
| Handle<JSObject> error = isolate->error_function(); |
| |
| Handle<String> key = isolate->factory()->stackTraceLimit_string(); |
| Handle<Object> stack_trace_limit = JSReceiver::GetDataProperty(error, key); |
| if (!stack_trace_limit->IsNumber()) return false; |
| |
| // Ensure that limit is not negative. |
| *result = Max(FastD2IChecked(stack_trace_limit->Number()), 0); |
| |
| if (*result != FLAG_stack_trace_limit) { |
| isolate->CountUsage(v8::Isolate::kErrorStackTraceLimit); |
| } |
| |
| return true; |
| } |
| |
| bool NoExtension(const v8::FunctionCallbackInfo<v8::Value>&) { return false; } |
| } // namespace |
| |
| Handle<Object> Isolate::CaptureSimpleStackTrace(Handle<JSReceiver> error_object, |
| FrameSkipMode mode, |
| Handle<Object> caller) { |
| DisallowJavascriptExecution no_js(this); |
| |
| int limit; |
| if (!GetStackTraceLimit(this, &limit)) return factory()->undefined_value(); |
| |
| FrameArrayBuilder builder(this, mode, limit, caller); |
| |
| for (StackFrameIterator iter(this); !iter.done() && !builder.full(); |
| iter.Advance()) { |
| StackFrame* frame = iter.frame(); |
| |
| switch (frame->type()) { |
| case StackFrame::JAVA_SCRIPT_BUILTIN_CONTINUATION: |
| case StackFrame::OPTIMIZED: |
| case StackFrame::INTERPRETED: |
| case StackFrame::BUILTIN: |
| builder.AppendStandardFrame(JavaScriptFrame::cast(frame)); |
| break; |
| case StackFrame::BUILTIN_EXIT: |
| // BuiltinExitFrames are not standard frames, so they do not have |
| // Summarize(). However, they may have one JS frame worth showing. |
| builder.AppendBuiltinExitFrame(BuiltinExitFrame::cast(frame)); |
| break; |
| case StackFrame::WASM_COMPILED: |
| builder.AppendStandardFrame(WasmCompiledFrame::cast(frame)); |
| break; |
| case StackFrame::WASM_INTERPRETER_ENTRY: |
| builder.AppendStandardFrame(WasmInterpreterEntryFrame::cast(frame)); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| // TODO(yangguo): Queue this structured stack trace for preprocessing on GC. |
| return factory()->NewJSArrayWithElements(builder.GetElements()); |
| } |
| |
| MaybeHandle<JSReceiver> Isolate::CaptureAndSetDetailedStackTrace( |
| Handle<JSReceiver> error_object) { |
| if (capture_stack_trace_for_uncaught_exceptions_) { |
| // Capture stack trace for a detailed exception message. |
| Handle<Name> key = factory()->detailed_stack_trace_symbol(); |
| Handle<FixedArray> stack_trace = CaptureCurrentStackTrace( |
| stack_trace_for_uncaught_exceptions_frame_limit_, |
| stack_trace_for_uncaught_exceptions_options_); |
| RETURN_ON_EXCEPTION(this, |
| JSReceiver::SetProperty(error_object, key, stack_trace, |
| LanguageMode::kStrict), |
| JSReceiver); |
| } |
| return error_object; |
| } |
| |
| MaybeHandle<JSReceiver> Isolate::CaptureAndSetSimpleStackTrace( |
| Handle<JSReceiver> error_object, FrameSkipMode mode, |
| Handle<Object> caller) { |
| // Capture stack trace for simple stack trace string formatting. |
| Handle<Name> key = factory()->stack_trace_symbol(); |
| Handle<Object> stack_trace = |
| CaptureSimpleStackTrace(error_object, mode, caller); |
| RETURN_ON_EXCEPTION(this, |
| JSReceiver::SetProperty(error_object, key, stack_trace, |
| LanguageMode::kStrict), |
| JSReceiver); |
| return error_object; |
| } |
| |
| Handle<FixedArray> Isolate::GetDetailedStackTrace( |
| Handle<JSObject> error_object) { |
| Handle<Name> key_detailed = factory()->detailed_stack_trace_symbol(); |
| Handle<Object> stack_trace = |
| JSReceiver::GetDataProperty(error_object, key_detailed); |
| if (stack_trace->IsFixedArray()) return Handle<FixedArray>::cast(stack_trace); |
| return Handle<FixedArray>(); |
| } |
| |
| Address Isolate::GetAbstractPC(int* line, int* column) { |
| JavaScriptFrameIterator it(this); |
| |
| if (it.done()) { |
| *line = -1; |
| *column = -1; |
| return nullptr; |
| } |
| JavaScriptFrame* frame = it.frame(); |
| DCHECK(!frame->is_builtin()); |
| int position = frame->position(); |
| |
| Object* maybe_script = frame->function()->shared()->script(); |
| if (maybe_script->IsScript()) { |
| Handle<Script> script(Script::cast(maybe_script), this); |
| Script::PositionInfo info; |
| Script::GetPositionInfo(script, position, &info, Script::WITH_OFFSET); |
| *line = info.line + 1; |
| *column = info.column + 1; |
| } else { |
| *line = position; |
| *column = -1; |
| } |
| |
| if (frame->is_interpreted()) { |
| InterpretedFrame* iframe = static_cast<InterpretedFrame*>(frame); |
| Address bytecode_start = |
| reinterpret_cast<Address>(iframe->GetBytecodeArray()) - kHeapObjectTag + |
| BytecodeArray::kHeaderSize; |
| return bytecode_start + iframe->GetBytecodeOffset(); |
| } |
| |
| return frame->pc(); |
| } |
| |
| class CaptureStackTraceHelper { |
| public: |
| explicit CaptureStackTraceHelper(Isolate* isolate) : isolate_(isolate) {} |
| |
| Handle<StackFrameInfo> NewStackFrameObject(FrameSummary& summ) { |
| if (summ.IsJavaScript()) return NewStackFrameObject(summ.AsJavaScript()); |
| if (summ.IsWasm()) return NewStackFrameObject(summ.AsWasm()); |
| UNREACHABLE(); |
| } |
| |
| Handle<StackFrameInfo> NewStackFrameObject( |
| const FrameSummary::JavaScriptFrameSummary& summ) { |
| int code_offset; |
| Handle<ByteArray> source_position_table; |
| Handle<Object> maybe_cache; |
| Handle<NumberDictionary> cache; |
| if (!FLAG_optimize_for_size) { |
| code_offset = summ.code_offset(); |
| source_position_table = |
| handle(summ.abstract_code()->source_position_table(), isolate_); |
| maybe_cache = handle(summ.abstract_code()->stack_frame_cache(), isolate_); |
| if (maybe_cache->IsNumberDictionary()) { |
| cache = Handle<NumberDictionary>::cast(maybe_cache); |
| } else { |
| cache = NumberDictionary::New(isolate_, 1); |
| } |
| int entry = cache->FindEntry(code_offset); |
| if (entry != NumberDictionary::kNotFound) { |
| Handle<StackFrameInfo> frame( |
| StackFrameInfo::cast(cache->ValueAt(entry))); |
| DCHECK(frame->function_name()->IsString()); |
| Handle<String> function_name = summ.FunctionName(); |
| if (function_name->Equals(String::cast(frame->function_name()))) { |
| return frame; |
| } |
| } |
| } |
| |
| Handle<StackFrameInfo> frame = factory()->NewStackFrameInfo(); |
| Handle<Script> script = Handle<Script>::cast(summ.script()); |
| Script::PositionInfo info; |
| bool valid_pos = Script::GetPositionInfo(script, summ.SourcePosition(), |
| &info, Script::WITH_OFFSET); |
| if (valid_pos) { |
| frame->set_line_number(info.line + 1); |
| frame->set_column_number(info.column + 1); |
| } |
| frame->set_script_id(script->id()); |
| frame->set_script_name(script->name()); |
| frame->set_script_name_or_source_url(script->GetNameOrSourceURL()); |
| frame->set_is_eval(script->compilation_type() == |
| Script::COMPILATION_TYPE_EVAL); |
| Handle<String> function_name = summ.FunctionName(); |
| frame->set_function_name(*function_name); |
| frame->set_is_constructor(summ.is_constructor()); |
| frame->set_is_wasm(false); |
| if (!FLAG_optimize_for_size) { |
| auto new_cache = NumberDictionary::Set(cache, code_offset, frame); |
| if (*new_cache != *cache || !maybe_cache->IsNumberDictionary()) { |
| AbstractCode::SetStackFrameCache(summ.abstract_code(), new_cache); |
| } |
| } |
| frame->set_id(next_id()); |
| return frame; |
| } |
| |
| Handle<StackFrameInfo> NewStackFrameObject( |
| const FrameSummary::WasmFrameSummary& summ) { |
| Handle<StackFrameInfo> info = factory()->NewStackFrameInfo(); |
| |
| Handle<WasmSharedModuleData> shared( |
| summ.wasm_instance()->compiled_module()->shared(), isolate_); |
| Handle<String> name = WasmSharedModuleData::GetFunctionName( |
| isolate_, shared, summ.function_index()); |
| info->set_function_name(*name); |
| // Encode the function index as line number (1-based). |
| info->set_line_number(summ.function_index() + 1); |
| // Encode the byte offset as column (1-based). |
| int position = summ.byte_offset(); |
| // Make position 1-based. |
| if (position >= 0) ++position; |
| info->set_column_number(position); |
| info->set_script_id(summ.script()->id()); |
| info->set_is_wasm(true); |
| info->set_id(next_id()); |
| return info; |
| } |
| |
| private: |
| inline Factory* factory() { return isolate_->factory(); } |
| |
| int next_id() const { |
| int id = isolate_->last_stack_frame_info_id() + 1; |
| isolate_->set_last_stack_frame_info_id(id); |
| return id; |
| } |
| |
| Isolate* isolate_; |
| }; |
| |
| Handle<FixedArray> Isolate::CaptureCurrentStackTrace( |
| int frame_limit, StackTrace::StackTraceOptions options) { |
| DisallowJavascriptExecution no_js(this); |
| CaptureStackTraceHelper helper(this); |
| |
| // Ensure no negative values. |
| int limit = Max(frame_limit, 0); |
| Handle<FixedArray> stack_trace_elems = factory()->NewFixedArray(limit); |
| |
| int frames_seen = 0; |
| for (StackTraceFrameIterator it(this); !it.done() && (frames_seen < limit); |
| it.Advance()) { |
| StandardFrame* frame = it.frame(); |
| // Set initial size to the maximum inlining level + 1 for the outermost |
| // function. |
| std::vector<FrameSummary> frames; |
| frame->Summarize(&frames); |
| for (size_t i = frames.size(); i != 0 && frames_seen < limit; i--) { |
| FrameSummary& frame = frames[i - 1]; |
| if (!frame.is_subject_to_debugging()) continue; |
| // Filter frames from other security contexts. |
| if (!(options & StackTrace::kExposeFramesAcrossSecurityOrigins) && |
| !this->context()->HasSameSecurityTokenAs(*frame.native_context())) |
| continue; |
| Handle<StackFrameInfo> new_frame_obj = helper.NewStackFrameObject(frame); |
| stack_trace_elems->set(frames_seen, *new_frame_obj); |
| frames_seen++; |
| } |
| } |
| stack_trace_elems->Shrink(frames_seen); |
| return stack_trace_elems; |
| } |
| |
| |
| void Isolate::PrintStack(FILE* out, PrintStackMode mode) { |
| if (stack_trace_nesting_level_ == 0) { |
| stack_trace_nesting_level_++; |
| StringStream::ClearMentionedObjectCache(this); |
| HeapStringAllocator allocator; |
| StringStream accumulator(&allocator); |
| incomplete_message_ = &accumulator; |
| PrintStack(&accumulator, mode); |
| accumulator.OutputToFile(out); |
| InitializeLoggingAndCounters(); |
| accumulator.Log(this); |
| incomplete_message_ = nullptr; |
| stack_trace_nesting_level_ = 0; |
| } else if (stack_trace_nesting_level_ == 1) { |
| stack_trace_nesting_level_++; |
| base::OS::PrintError( |
| "\n\nAttempt to print stack while printing stack (double fault)\n"); |
| base::OS::PrintError( |
| "If you are lucky you may find a partial stack dump on stdout.\n\n"); |
| incomplete_message_->OutputToFile(out); |
| } |
| } |
| |
| |
| static void PrintFrames(Isolate* isolate, |
| StringStream* accumulator, |
| StackFrame::PrintMode mode) { |
| StackFrameIterator it(isolate); |
| for (int i = 0; !it.done(); it.Advance()) { |
| it.frame()->Print(accumulator, mode, i++); |
| } |
| } |
| |
| void Isolate::PrintStack(StringStream* accumulator, PrintStackMode mode) { |
| // The MentionedObjectCache is not GC-proof at the moment. |
| DisallowHeapAllocation no_gc; |
| HandleScope scope(this); |
| DCHECK(accumulator->IsMentionedObjectCacheClear(this)); |
| |
| // Avoid printing anything if there are no frames. |
| if (c_entry_fp(thread_local_top()) == 0) return; |
| |
| accumulator->Add( |
| "\n==== JS stack trace =========================================\n\n"); |
| PrintFrames(this, accumulator, StackFrame::OVERVIEW); |
| if (mode == kPrintStackVerbose) { |
| accumulator->Add( |
| "\n==== Details ================================================\n\n"); |
| PrintFrames(this, accumulator, StackFrame::DETAILS); |
| accumulator->PrintMentionedObjectCache(this); |
| } |
| accumulator->Add("=====================\n\n"); |
| } |
| |
| |
| void Isolate::SetFailedAccessCheckCallback( |
| v8::FailedAccessCheckCallback callback) { |
| thread_local_top()->failed_access_check_callback_ = callback; |
| } |
| |
| |
| void Isolate::ReportFailedAccessCheck(Handle<JSObject> receiver) { |
| if (!thread_local_top()->failed_access_check_callback_) { |
| return ScheduleThrow(*factory()->NewTypeError(MessageTemplate::kNoAccess)); |
| } |
| |
| DCHECK(receiver->IsAccessCheckNeeded()); |
| DCHECK(context()); |
| |
| // Get the data object from access check info. |
| HandleScope scope(this); |
| Handle<Object> data; |
| { DisallowHeapAllocation no_gc; |
| AccessCheckInfo* access_check_info = AccessCheckInfo::Get(this, receiver); |
| if (!access_check_info) { |
| AllowHeapAllocation doesnt_matter_anymore; |
| return ScheduleThrow( |
| *factory()->NewTypeError(MessageTemplate::kNoAccess)); |
| } |
| data = handle(access_check_info->data(), this); |
| } |
| |
| // Leaving JavaScript. |
| VMState<EXTERNAL> state(this); |
| thread_local_top()->failed_access_check_callback_( |
| v8::Utils::ToLocal(receiver), v8::ACCESS_HAS, v8::Utils::ToLocal(data)); |
| } |
| |
| |
| bool Isolate::MayAccess(Handle<Context> accessing_context, |
| Handle<JSObject> receiver) { |
| DCHECK(receiver->IsJSGlobalProxy() || receiver->IsAccessCheckNeeded()); |
| |
| // Check for compatibility between the security tokens in the |
| // current lexical context and the accessed object. |
| |
| // During bootstrapping, callback functions are not enabled yet. |
| if (bootstrapper()->IsActive()) return true; |
| { |
| DisallowHeapAllocation no_gc; |
| |
| if (receiver->IsJSGlobalProxy()) { |
| Object* receiver_context = |
| JSGlobalProxy::cast(*receiver)->native_context(); |
| if (!receiver_context->IsContext()) return false; |
| |
| // Get the native context of current top context. |
| // avoid using Isolate::native_context() because it uses Handle. |
| Context* native_context = |
| accessing_context->global_object()->native_context(); |
| if (receiver_context == native_context) return true; |
| |
| if (Context::cast(receiver_context)->security_token() == |
| native_context->security_token()) |
| return true; |
| } |
| } |
| |
| HandleScope scope(this); |
| Handle<Object> data; |
| v8::AccessCheckCallback callback = nullptr; |
| { DisallowHeapAllocation no_gc; |
| AccessCheckInfo* access_check_info = AccessCheckInfo::Get(this, receiver); |
| if (!access_check_info) return false; |
| Object* fun_obj = access_check_info->callback(); |
| callback = v8::ToCData<v8::AccessCheckCallback>(fun_obj); |
| data = handle(access_check_info->data(), this); |
| } |
| |
| LOG(this, ApiSecurityCheck()); |
| |
| { |
| // Leaving JavaScript. |
| VMState<EXTERNAL> state(this); |
| return callback(v8::Utils::ToLocal(accessing_context), |
| v8::Utils::ToLocal(receiver), v8::Utils::ToLocal(data)); |
| } |
| } |
| |
| |
| Object* Isolate::StackOverflow() { |
| if (FLAG_abort_on_stack_or_string_length_overflow) { |
| FATAL("Aborting on stack overflow"); |
| } |
| |
| DisallowJavascriptExecution no_js(this); |
| HandleScope scope(this); |
| |
| Handle<JSFunction> fun = range_error_function(); |
| Handle<Object> msg = factory()->NewStringFromAsciiChecked( |
| MessageTemplate::TemplateString(MessageTemplate::kStackOverflow)); |
| Handle<Object> no_caller; |
| Handle<Object> exception; |
| ASSIGN_RETURN_FAILURE_ON_EXCEPTION( |
| this, exception, |
| ErrorUtils::Construct(this, fun, fun, msg, SKIP_NONE, no_caller, true)); |
| |
| Throw(*exception, nullptr); |
| |
| #ifdef VERIFY_HEAP |
| if (FLAG_verify_heap && FLAG_stress_compaction) { |
| heap()->CollectAllGarbage(Heap::kNoGCFlags, |
| GarbageCollectionReason::kTesting); |
| } |
| #endif // VERIFY_HEAP |
| |
| return heap()->exception(); |
| } |
| |
| |
| Object* Isolate::TerminateExecution() { |
| return Throw(heap_.termination_exception(), nullptr); |
| } |
| |
| |
| void Isolate::CancelTerminateExecution() { |
| if (try_catch_handler()) { |
| try_catch_handler()->has_terminated_ = false; |
| } |
| if (has_pending_exception() && |
| pending_exception() == heap_.termination_exception()) { |
| thread_local_top()->external_caught_exception_ = false; |
| clear_pending_exception(); |
| } |
| if (has_scheduled_exception() && |
| scheduled_exception() == heap_.termination_exception()) { |
| thread_local_top()->external_caught_exception_ = false; |
| clear_scheduled_exception(); |
| } |
| } |
| |
| |
| void Isolate::RequestInterrupt(InterruptCallback callback, void* data) { |
| ExecutionAccess access(this); |
| api_interrupts_queue_.push(InterruptEntry(callback, data)); |
| stack_guard()->RequestApiInterrupt(); |
| } |
| |
| |
| void Isolate::InvokeApiInterruptCallbacks() { |
| RuntimeCallTimerScope runtimeTimer( |
| this, RuntimeCallCounterId::kInvokeApiInterruptCallbacks); |
| // Note: callback below should be called outside of execution access lock. |
| while (true) { |
| InterruptEntry entry; |
| { |
| ExecutionAccess access(this); |
| if (api_interrupts_queue_.empty()) return; |
| entry = api_interrupts_queue_.front(); |
| api_interrupts_queue_.pop(); |
| } |
| VMState<EXTERNAL> state(this); |
| HandleScope handle_scope(this); |
| entry.first(reinterpret_cast<v8::Isolate*>(this), entry.second); |
| } |
| } |
| |
| |
| void ReportBootstrappingException(Handle<Object> exception, |
| MessageLocation* location) { |
| base::OS::PrintError("Exception thrown during bootstrapping\n"); |
| if (location == nullptr || location->script().is_null()) return; |
| // We are bootstrapping and caught an error where the location is set |
| // and we have a script for the location. |
| // In this case we could have an extension (or an internal error |
| // somewhere) and we print out the line number at which the error occurred |
| // to the console for easier debugging. |
| int line_number = |
| location->script()->GetLineNumber(location->start_pos()) + 1; |
| if (exception->IsString() && location->script()->name()->IsString()) { |
| base::OS::PrintError( |
| "Extension or internal compilation error: %s in %s at line %d.\n", |
| String::cast(*exception)->ToCString().get(), |
| String::cast(location->script()->name())->ToCString().get(), |
| line_number); |
| } else if (location->script()->name()->IsString()) { |
| base::OS::PrintError( |
| "Extension or internal compilation error in %s at line %d.\n", |
| String::cast(location->script()->name())->ToCString().get(), |
| line_number); |
| } else if (exception->IsString()) { |
| base::OS::PrintError("Extension or internal compilation error: %s.\n", |
| String::cast(*exception)->ToCString().get()); |
| } else { |
| base::OS::PrintError("Extension or internal compilation error.\n"); |
| } |
| #ifdef OBJECT_PRINT |
| // Since comments and empty lines have been stripped from the source of |
| // builtins, print the actual source here so that line numbers match. |
| if (location->script()->source()->IsString()) { |
| Handle<String> src(String::cast(location->script()->source())); |
| PrintF("Failing script:"); |
| int len = src->length(); |
| if (len == 0) { |
| PrintF(" <not available>\n"); |
| } else { |
| PrintF("\n"); |
| int line_number = 1; |
| PrintF("%5d: ", line_number); |
| for (int i = 0; i < len; i++) { |
| uint16_t character = src->Get(i); |
| PrintF("%c", character); |
| if (character == '\n' && i < len - 2) { |
| PrintF("%5d: ", ++line_number); |
| } |
| } |
| PrintF("\n"); |
| } |
| } |
| #endif |
| } |
| |
| bool Isolate::is_catchable_by_wasm(Object* exception) { |
| if (!is_catchable_by_javascript(exception) || !exception->IsJSError()) |
| return false; |
| HandleScope scope(this); |
| Handle<Object> exception_handle(exception, this); |
| return JSReceiver::HasProperty(Handle<JSReceiver>::cast(exception_handle), |
| factory()->InternalizeUtf8String( |
| wasm::WasmException::kRuntimeIdStr)) |
| .IsJust(); |
| } |
| |
| Object* Isolate::Throw(Object* exception, MessageLocation* location) { |
| DCHECK(!has_pending_exception()); |
| |
| HandleScope scope(this); |
| Handle<Object> exception_handle(exception, this); |
| |
| if (FLAG_print_all_exceptions) { |
| #if V8_OS_STARBOARD |
| SB_NOTIMPLEMENTED(); |
| #else |
| printf("=========================================================\n"); |
| printf("Exception thrown:\n"); |
| if (location) { |
| Handle<Script> script = location->script(); |
| Handle<Object> name(script->GetNameOrSourceURL(), this); |
| printf("at "); |
| if (name->IsString() && String::cast(*name)->length() > 0) |
| String::cast(*name)->PrintOn(stdout); |
| else |
| printf("<anonymous>"); |
| // Script::GetLineNumber and Script::GetColumnNumber can allocate on the heap to |
| // initialize the line_ends array, so be careful when calling them. |
| #ifdef DEBUG |
| if (AllowHeapAllocation::IsAllowed()) { |
| #else |
| if ((false)) { |
| #endif |
| printf(", %d:%d - %d:%d\n", |
| Script::GetLineNumber(script, location->start_pos()) + 1, |
| Script::GetColumnNumber(script, location->start_pos()), |
| Script::GetLineNumber(script, location->end_pos()) + 1, |
| Script::GetColumnNumber(script, location->end_pos())); |
| } else { |
| printf(", line %d\n", script->GetLineNumber(location->start_pos()) + 1); |
| } |
| } |
| exception->Print(); |
| printf("Stack Trace:\n"); |
| PrintStack(stdout); |
| printf("=========================================================\n"); |
| #endif // V8_OS_STARBOARD |
| } |
| |
| // Determine whether a message needs to be created for the given exception |
| // depending on the following criteria: |
| // 1) External v8::TryCatch missing: Always create a message because any |
| // JavaScript handler for a finally-block might re-throw to top-level. |
| // 2) External v8::TryCatch exists: Only create a message if the handler |
| // captures messages or is verbose (which reports despite the catch). |
| // 3) ReThrow from v8::TryCatch: The message from a previous throw still |
| // exists and we preserve it instead of creating a new message. |
| bool requires_message = try_catch_handler() == nullptr || |
| try_catch_handler()->is_verbose_ || |
| try_catch_handler()->capture_message_; |
| bool rethrowing_message = thread_local_top()->rethrowing_message_; |
| |
| thread_local_top()->rethrowing_message_ = false; |
| |
| // Notify debugger of exception. |
| if (is_catchable_by_javascript(exception)) { |
| debug()->OnThrow(exception_handle); |
| } |
| |
| // Generate the message if required. |
| if (requires_message && !rethrowing_message) { |
| MessageLocation computed_location; |
| // If no location was specified we try to use a computed one instead. |
| if (location == nullptr && ComputeLocation(&computed_location)) { |
| location = &computed_location; |
| } |
| |
| if (bootstrapper()->IsActive()) { |
| // It's not safe to try to make message objects or collect stack traces |
| // while the bootstrapper is active since the infrastructure may not have |
| // been properly initialized. |
| ReportBootstrappingException(exception_handle, location); |
| } else { |
| Handle<Object> message_obj = CreateMessage(exception_handle, location); |
| thread_local_top()->pending_message_obj_ = *message_obj; |
| |
| // For any exception not caught by JavaScript, even when an external |
| // handler is present: |
| // If the abort-on-uncaught-exception flag is specified, and if the |
| // embedder didn't specify a custom uncaught exception callback, |
| // or if the custom callback determined that V8 should abort, then |
| // abort. |
| if (FLAG_abort_on_uncaught_exception) { |
| CatchType prediction = PredictExceptionCatcher(); |
| if ((prediction == NOT_CAUGHT || prediction == CAUGHT_BY_EXTERNAL) && |
| (!abort_on_uncaught_exception_callback_ || |
| abort_on_uncaught_exception_callback_( |
| reinterpret_cast<v8::Isolate*>(this)))) { |
| // Prevent endless recursion. |
| FLAG_abort_on_uncaught_exception = false; |
| // This flag is intended for use by JavaScript developers, so |
| // print a user-friendly stack trace (not an internal one). |
| PrintF(stderr, "%s\n\nFROM\n", |
| MessageHandler::GetLocalizedMessage(this, message_obj).get()); |
| PrintCurrentStackTrace(stderr); |
| base::OS::Abort(); |
| } |
| } |
| } |
| } |
| |
| // Set the exception being thrown. |
| set_pending_exception(*exception_handle); |
| return heap()->exception(); |
| } |
| |
| |
| Object* Isolate::ReThrow(Object* exception) { |
| DCHECK(!has_pending_exception()); |
| |
| // Set the exception being re-thrown. |
| set_pending_exception(exception); |
| return heap()->exception(); |
| } |
| |
| |
| Object* Isolate::UnwindAndFindHandler() { |
| Object* exception = pending_exception(); |
| |
| auto FoundHandler = [&](Context* context, Address instruction_start, |
| intptr_t handler_offset, |
| Address constant_pool_address, Address handler_sp, |
| Address handler_fp) { |
| // Store information to be consumed by the CEntryStub. |
| thread_local_top()->pending_handler_context_ = context; |
| thread_local_top()->pending_handler_entrypoint_ = |
| instruction_start + handler_offset; |
| thread_local_top()->pending_handler_constant_pool_ = constant_pool_address; |
| thread_local_top()->pending_handler_fp_ = handler_fp; |
| thread_local_top()->pending_handler_sp_ = handler_sp; |
| |
| // Return and clear pending exception. |
| clear_pending_exception(); |
| return exception; |
| }; |
| |
| // Special handling of termination exceptions, uncatchable by JavaScript and |
| // Wasm code, we unwind the handlers until the top ENTRY handler is found. |
| bool catchable_by_js = is_catchable_by_javascript(exception); |
| |
| // Compute handler and stack unwinding information by performing a full walk |
| // over the stack and dispatching according to the frame type. |
| for (StackFrameIterator iter(this);; iter.Advance()) { |
| // Handler must exist. |
| DCHECK(!iter.done()); |
| |
| StackFrame* frame = iter.frame(); |
| |
| switch (frame->type()) { |
| case StackFrame::ENTRY: |
| case StackFrame::CONSTRUCT_ENTRY: { |
| // For JSEntryStub frames we always have a handler. |
| StackHandler* handler = frame->top_handler(); |
| |
| // Restore the next handler. |
| thread_local_top()->handler_ = handler->next()->address(); |
| |
| // Gather information from the handler. |
| Code* code = frame->LookupCode(); |
| return FoundHandler( |
| nullptr, code->instruction_start(), |
| Smi::ToInt(code->handler_table()->get(0)), code->constant_pool(), |
| handler->address() + StackHandlerConstants::kSize, 0); |
| } |
| |
| case StackFrame::WASM_COMPILED: { |
| if (trap_handler::IsThreadInWasm()) { |
| trap_handler::ClearThreadInWasm(); |
| } |
| |
| if (!FLAG_experimental_wasm_eh || !is_catchable_by_wasm(exception)) { |
| break; |
| } |
| int stack_slots = 0; // Will contain stack slot count of frame. |
| WasmCompiledFrame* wasm_frame = static_cast<WasmCompiledFrame*>(frame); |
| int offset = wasm_frame->LookupExceptionHandlerInTable(&stack_slots); |
| if (offset < 0) break; |
| // Compute the stack pointer from the frame pointer. This ensures that |
| // argument slots on the stack are dropped as returning would. |
| Address return_sp = frame->fp() + |
| StandardFrameConstants::kFixedFrameSizeAboveFp - |
| stack_slots * kPointerSize; |
| |
| // This is going to be handled by Wasm, so we need to set the TLS flag |
| // again. |
| trap_handler::SetThreadInWasm(); |
| |
| set_wasm_caught_exception(exception); |
| if (FLAG_wasm_jit_to_native) { |
| wasm::WasmCode* wasm_code = |
| wasm_engine()->code_manager()->LookupCode(frame->pc()); |
| return FoundHandler(nullptr, wasm_code->instructions().start(), |
| offset, wasm_code->constant_pool(), return_sp, |
| frame->fp()); |
| } else { |
| Code* code = frame->LookupCode(); |
| return FoundHandler(nullptr, code->instruction_start(), offset, |
| code->constant_pool(), return_sp, frame->fp()); |
| } |
| } |
| |
| case StackFrame::OPTIMIZED: { |
| // For optimized frames we perform a lookup in the handler table. |
| if (!catchable_by_js) break; |
| OptimizedFrame* js_frame = static_cast<OptimizedFrame*>(frame); |
| int stack_slots = 0; // Will contain stack slot count of frame. |
| int offset = |
| js_frame->LookupExceptionHandlerInTable(&stack_slots, nullptr); |
| if (offset < 0) break; |
| // Compute the stack pointer from the frame pointer. This ensures |
| // that argument slots on the stack are dropped as returning would. |
| Address return_sp = frame->fp() + |
| StandardFrameConstants::kFixedFrameSizeAboveFp - |
| stack_slots * kPointerSize; |
| |
| // Gather information from the frame. |
| Code* code = frame->LookupCode(); |
| |
| // TODO(bmeurer): Turbofanned BUILTIN frames appear as OPTIMIZED, |
| // but do not have a code kind of OPTIMIZED_FUNCTION. |
| if (code->kind() == Code::OPTIMIZED_FUNCTION && |
| code->marked_for_deoptimization()) { |
| // If the target code is lazy deoptimized, we jump to the original |
| // return address, but we make a note that we are throwing, so |
| // that the deoptimizer can do the right thing. |
| offset = static_cast<int>(frame->pc() - code->entry()); |
| set_deoptimizer_lazy_throw(true); |
| } |
| |
| return FoundHandler(nullptr, code->instruction_start(), offset, |
| code->constant_pool(), return_sp, frame->fp()); |
| } |
| |
| case StackFrame::STUB: { |
| // Some stubs are able to handle exceptions. |
| if (!catchable_by_js) break; |
| StubFrame* stub_frame = static_cast<StubFrame*>(frame); |
| Code* code = stub_frame->LookupCode(); |
| if (!code->IsCode() || code->kind() != Code::BUILTIN || |
| !code->handler_table()->length() || !code->is_turbofanned()) { |
| break; |
| } |
| |
| int stack_slots = 0; // Will contain stack slot count of frame. |
| int offset = stub_frame->LookupExceptionHandlerInTable(&stack_slots); |
| if (offset < 0) break; |
| |
| // Compute the stack pointer from the frame pointer. This ensures |
| // that argument slots on the stack are dropped as returning would. |
| Address return_sp = frame->fp() + |
| StandardFrameConstants::kFixedFrameSizeAboveFp - |
| stack_slots * kPointerSize; |
| |
| return FoundHandler(nullptr, code->instruction_start(), offset, |
| code->constant_pool(), return_sp, frame->fp()); |
| } |
| |
| case StackFrame::INTERPRETED: { |
| // For interpreted frame we perform a range lookup in the handler table. |
| if (!catchable_by_js) break; |
| InterpretedFrame* js_frame = static_cast<InterpretedFrame*>(frame); |
| int register_slots = InterpreterFrameConstants::RegisterStackSlotCount( |
| js_frame->GetBytecodeArray()->register_count()); |
| int context_reg = 0; // Will contain register index holding context. |
| int offset = |
| js_frame->LookupExceptionHandlerInTable(&context_reg, nullptr); |
| if (offset < 0) break; |
| // Compute the stack pointer from the frame pointer. This ensures that |
| // argument slots on the stack are dropped as returning would. |
| // Note: This is only needed for interpreted frames that have been |
| // materialized by the deoptimizer. If there is a handler frame |
| // in between then {frame->sp()} would already be correct. |
| Address return_sp = frame->fp() - |
| InterpreterFrameConstants::kFixedFrameSizeFromFp - |
| register_slots * kPointerSize; |
| |
| // Patch the bytecode offset in the interpreted frame to reflect the |
| // position of the exception handler. The special builtin below will |
| // take care of continuing to dispatch at that position. Also restore |
| // the correct context for the handler from the interpreter register. |
| Context* context = |
| Context::cast(js_frame->ReadInterpreterRegister(context_reg)); |
| js_frame->PatchBytecodeOffset(static_cast<int>(offset)); |
| |
| Code* code = |
| builtins()->builtin(Builtins::kInterpreterEnterBytecodeDispatch); |
| return FoundHandler(context, code->instruction_start(), 0, |
| code->constant_pool(), return_sp, frame->fp()); |
| } |
| |
| case StackFrame::BUILTIN: |
| // For builtin frames we are guaranteed not to find a handler. |
| if (catchable_by_js) { |
| CHECK_EQ(-1, |
| JavaScriptFrame::cast(frame)->LookupExceptionHandlerInTable( |
| nullptr, nullptr)); |
| } |
| break; |
| |
| case StackFrame::WASM_INTERPRETER_ENTRY: { |
| if (trap_handler::IsThreadInWasm()) { |
| trap_handler::ClearThreadInWasm(); |
| } |
| WasmInterpreterEntryFrame* interpreter_frame = |
| WasmInterpreterEntryFrame::cast(frame); |
| // TODO(wasm): Implement try-catch in the interpreter. |
| interpreter_frame->wasm_instance()->debug_info()->Unwind(frame->fp()); |
| } break; |
| |
| default: |
| // All other types can not handle exception. |
| break; |
| } |
| |
| if (frame->is_optimized()) { |
| // Remove per-frame stored materialized objects. |
| bool removed = materialized_object_store_->Remove(frame->fp()); |
| USE(removed); |
| // If there were any materialized objects, the code should be |
| // marked for deopt. |
| DCHECK_IMPLIES(removed, frame->LookupCode()->marked_for_deoptimization()); |
| } |
| } |
| |
| UNREACHABLE(); |
| } |
| |
| namespace { |
| HandlerTable::CatchPrediction PredictException(JavaScriptFrame* frame) { |
| HandlerTable::CatchPrediction prediction; |
| if (frame->is_optimized()) { |
| if (frame->LookupExceptionHandlerInTable(nullptr, nullptr) > 0) { |
| // This optimized frame will catch. It's handler table does not include |
| // exception prediction, and we need to use the corresponding handler |
| // tables on the unoptimized code objects. |
| std::vector<FrameSummary> summaries; |
| frame->Summarize(&summaries); |
| for (size_t i = summaries.size(); i != 0; i--) { |
| const FrameSummary& summary = summaries[i - 1]; |
| Handle<AbstractCode> code = summary.AsJavaScript().abstract_code(); |
| if (code->IsCode() && code->kind() == AbstractCode::BUILTIN) { |
| prediction = code->GetCode()->GetBuiltinCatchPrediction(); |
| if (prediction == HandlerTable::UNCAUGHT) continue; |
| return prediction; |
| } |
| |
| // Must have been constructed from a bytecode array. |
| CHECK_EQ(AbstractCode::INTERPRETED_FUNCTION, code->kind()); |
| int code_offset = summary.code_offset(); |
| BytecodeArray* bytecode = code->GetBytecodeArray(); |
| HandlerTable* table = HandlerTable::cast(bytecode->handler_table()); |
| int index = table->LookupRange(code_offset, nullptr, &prediction); |
| if (index <= 0) continue; |
| if (prediction == HandlerTable::UNCAUGHT) continue; |
| return prediction; |
| } |
| } |
| } else if (frame->LookupExceptionHandlerInTable(nullptr, &prediction) > 0) { |
| return prediction; |
| } |
| return HandlerTable::UNCAUGHT; |
| } |
| |
| Isolate::CatchType ToCatchType(HandlerTable::CatchPrediction prediction) { |
| switch (prediction) { |
| case HandlerTable::UNCAUGHT: |
| return Isolate::NOT_CAUGHT; |
| case HandlerTable::CAUGHT: |
| return Isolate::CAUGHT_BY_JAVASCRIPT; |
| case HandlerTable::PROMISE: |
| return Isolate::CAUGHT_BY_PROMISE; |
| case HandlerTable::DESUGARING: |
| return Isolate::CAUGHT_BY_DESUGARING; |
| case HandlerTable::ASYNC_AWAIT: |
| return Isolate::CAUGHT_BY_ASYNC_AWAIT; |
| default: |
| UNREACHABLE(); |
| } |
| } |
| } // anonymous namespace |
| |
| Isolate::CatchType Isolate::PredictExceptionCatcher() { |
| Address external_handler = thread_local_top()->try_catch_handler_address(); |
| if (IsExternalHandlerOnTop(nullptr)) return CAUGHT_BY_EXTERNAL; |
| |
| // Search for an exception handler by performing a full walk over the stack. |
| for (StackFrameIterator iter(this); !iter.done(); iter.Advance()) { |
| StackFrame* frame = iter.frame(); |
| |
| switch (frame->type()) { |
| case StackFrame::ENTRY: |
| case StackFrame::CONSTRUCT_ENTRY: { |
| Address entry_handler = frame->top_handler()->next()->address(); |
| // The exception has been externally caught if and only if there is an |
| // external handler which is on top of the top-most JS_ENTRY handler. |
| if (external_handler != nullptr && !try_catch_handler()->is_verbose_) { |
| if (entry_handler == nullptr || entry_handler > external_handler) { |
| return CAUGHT_BY_EXTERNAL; |
| } |
| } |
| } break; |
| |
| // For JavaScript frames we perform a lookup in the handler table. |
| case StackFrame::OPTIMIZED: |
| case StackFrame::INTERPRETED: |
| case StackFrame::BUILTIN: { |
| JavaScriptFrame* js_frame = JavaScriptFrame::cast(frame); |
| Isolate::CatchType prediction = ToCatchType(PredictException(js_frame)); |
| if (prediction == NOT_CAUGHT) break; |
| return prediction; |
| } break; |
| |
| case StackFrame::STUB: { |
| Handle<Code> code(frame->LookupCode()); |
| if (!code->IsCode() || code->kind() != Code::BUILTIN || |
| !code->handler_table()->length() || !code->is_turbofanned()) { |
| break; |
| } |
| |
| CatchType prediction = ToCatchType(code->GetBuiltinCatchPrediction()); |
| if (prediction != NOT_CAUGHT) return prediction; |
| } break; |
| |
| default: |
| // All other types can not handle exception. |
| break; |
| } |
| } |
| |
| // Handler not found. |
| return NOT_CAUGHT; |
| } |
| |
| Object* Isolate::ThrowIllegalOperation() { |
| if (FLAG_stack_trace_on_illegal) PrintStack(stdout); |
| return Throw(heap()->illegal_access_string()); |
| } |
| |
| |
| void Isolate::ScheduleThrow(Object* exception) { |
| // When scheduling a throw we first throw the exception to get the |
| // error reporting if it is uncaught before rescheduling it. |
| Throw(exception); |
| PropagatePendingExceptionToExternalTryCatch(); |
| if (has_pending_exception()) { |
| thread_local_top()->scheduled_exception_ = pending_exception(); |
| thread_local_top()->external_caught_exception_ = false; |
| clear_pending_exception(); |
| } |
| } |
| |
| |
| void Isolate::RestorePendingMessageFromTryCatch(v8::TryCatch* handler) { |
| DCHECK(handler == try_catch_handler()); |
| DCHECK(handler->HasCaught()); |
| DCHECK(handler->rethrow_); |
| DCHECK(handler->capture_message_); |
| Object* message = reinterpret_cast<Object*>(handler->message_obj_); |
| DCHECK(message->IsJSMessageObject() || message->IsTheHole(this)); |
| thread_local_top()->pending_message_obj_ = message; |
| } |
| |
| |
| void Isolate::CancelScheduledExceptionFromTryCatch(v8::TryCatch* handler) { |
| DCHECK(has_scheduled_exception()); |
| if (scheduled_exception() == handler->exception_) { |
| DCHECK(scheduled_exception() != heap()->termination_exception()); |
| clear_scheduled_exception(); |
| } |
| if (thread_local_top_.pending_message_obj_ == handler->message_obj_) { |
| clear_pending_message(); |
| } |
| } |
| |
| |
| Object* Isolate::PromoteScheduledException() { |
| Object* thrown = scheduled_exception(); |
| clear_scheduled_exception(); |
| // Re-throw the exception to avoid getting repeated error reporting. |
| return ReThrow(thrown); |
| } |
| |
| |
| void Isolate::PrintCurrentStackTrace(FILE* out) { |
| for (StackTraceFrameIterator it(this); !it.done(); it.Advance()) { |
| if (!it.is_javascript()) continue; |
| |
| HandleScope scope(this); |
| JavaScriptFrame* frame = it.javascript_frame(); |
| |
| Handle<Object> receiver(frame->receiver(), this); |
| Handle<JSFunction> function(frame->function(), this); |
| Handle<AbstractCode> code(AbstractCode::cast(frame->LookupCode()), this); |
| const int offset = |
| static_cast<int>(frame->pc() - code->instruction_start()); |
| |
| JSStackFrame site(this, receiver, function, code, offset); |
| Handle<String> line = site.ToString().ToHandleChecked(); |
| if (line->length() > 0) { |
| line->PrintOn(out); |
| PrintF(out, "\n"); |
| } |
| } |
| } |
| |
| bool Isolate::ComputeLocation(MessageLocation* target) { |
| StackTraceFrameIterator it(this); |
| if (it.done()) return false; |
| StandardFrame* frame = it.frame(); |
| // Compute the location from the function and the relocation info of the |
| // baseline code. For optimized code this will use the deoptimization |
| // information to get canonical location information. |
| std::vector<FrameSummary> frames; |
| frame->Summarize(&frames); |
| FrameSummary& summary = frames.back(); |
| int pos = summary.SourcePosition(); |
| Handle<SharedFunctionInfo> shared; |
| Handle<Object> script = summary.script(); |
| if (!script->IsScript() || |
| (Script::cast(*script)->source()->IsUndefined(this))) { |
| return false; |
| } |
| |
| if (summary.IsJavaScript()) { |
| shared = handle(summary.AsJavaScript().function()->shared()); |
| } |
| *target = MessageLocation(Handle<Script>::cast(script), pos, pos + 1, shared); |
| return true; |
| } |
| |
| bool Isolate::ComputeLocationFromException(MessageLocation* target, |
| Handle<Object> exception) { |
| if (!exception->IsJSObject()) return false; |
| |
| Handle<Name> start_pos_symbol = factory()->error_start_pos_symbol(); |
| Handle<Object> start_pos = JSReceiver::GetDataProperty( |
| Handle<JSObject>::cast(exception), start_pos_symbol); |
| if (!start_pos->IsSmi()) return false; |
| int start_pos_value = Handle<Smi>::cast(start_pos)->value(); |
| |
| Handle<Name> end_pos_symbol = factory()->error_end_pos_symbol(); |
| Handle<Object> end_pos = JSReceiver::GetDataProperty( |
| Handle<JSObject>::cast(exception), end_pos_symbol); |
| if (!end_pos->IsSmi()) return false; |
| int end_pos_value = Handle<Smi>::cast(end_pos)->value(); |
| |
| Handle<Name> script_symbol = factory()->error_script_symbol(); |
| Handle<Object> script = JSReceiver::GetDataProperty( |
| Handle<JSObject>::cast(exception), script_symbol); |
| if (!script->IsScript()) return false; |
| |
| Handle<Script> cast_script(Script::cast(*script)); |
| *target = MessageLocation(cast_script, start_pos_value, end_pos_value); |
| return true; |
| } |
| |
| |
| bool Isolate::ComputeLocationFromStackTrace(MessageLocation* target, |
| Handle<Object> exception) { |
| if (!exception->IsJSObject()) return false; |
| Handle<Name> key = factory()->stack_trace_symbol(); |
| Handle<Object> property = |
| JSReceiver::GetDataProperty(Handle<JSObject>::cast(exception), key); |
| if (!property->IsJSArray()) return false; |
| Handle<JSArray> simple_stack_trace = Handle<JSArray>::cast(property); |
| |
| Handle<FrameArray> elements(FrameArray::cast(simple_stack_trace->elements())); |
| |
| const int frame_count = elements->FrameCount(); |
| for (int i = 0; i < frame_count; i++) { |
| if (elements->IsWasmFrame(i) || elements->IsAsmJsWasmFrame(i)) { |
| Handle<WasmCompiledModule> compiled_module( |
| elements->WasmInstance(i)->compiled_module()); |
| uint32_t func_index = |
| static_cast<uint32_t>(elements->WasmFunctionIndex(i)->value()); |
| int code_offset = elements->Offset(i)->value(); |
| |
| // TODO(titzer): store a reference to the code object in FrameArray; |
| // a second lookup here could lead to inconsistency. |
| int byte_offset = |
| FLAG_wasm_jit_to_native |
| ? FrameSummary::WasmCompiledFrameSummary::GetWasmSourcePosition( |
| compiled_module->GetNativeModule()->GetCode(func_index), |
| code_offset) |
| : elements->Code(i)->SourcePosition(code_offset); |
| |
| bool is_at_number_conversion = |
| elements->IsAsmJsWasmFrame(i) && |
| elements->Flags(i)->value() & FrameArray::kAsmJsAtNumberConversion; |
| int pos = WasmSharedModuleData::GetSourcePosition( |
| handle(compiled_module->shared(), this), func_index, byte_offset, |
| is_at_number_conversion); |
| Handle<Script> script(compiled_module->shared()->script()); |
| |
| *target = MessageLocation(script, pos, pos + 1); |
| return true; |
| } |
| |
| Handle<JSFunction> fun = handle(elements->Function(i), this); |
| if (!fun->shared()->IsSubjectToDebugging()) continue; |
| |
| Object* script = fun->shared()->script(); |
| if (script->IsScript() && |
| !(Script::cast(script)->source()->IsUndefined(this))) { |
| AbstractCode* abstract_code = elements->Code(i); |
| const int code_offset = elements->Offset(i)->value(); |
| const int pos = abstract_code->SourcePosition(code_offset); |
| |
| Handle<Script> casted_script(Script::cast(script)); |
| *target = MessageLocation(casted_script, pos, pos + 1); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| |
| Handle<JSMessageObject> Isolate::CreateMessage(Handle<Object> exception, |
| MessageLocation* location) { |
| Handle<FixedArray> stack_trace_object; |
| if (capture_stack_trace_for_uncaught_exceptions_) { |
| if (exception->IsJSError()) { |
| // We fetch the stack trace that corresponds to this error object. |
| // If the lookup fails, the exception is probably not a valid Error |
| // object. In that case, we fall through and capture the stack trace |
| // at this throw site. |
| stack_trace_object = |
| GetDetailedStackTrace(Handle<JSObject>::cast(exception)); |
| } |
| if (stack_trace_object.is_null()) { |
| // Not an error object, we capture stack and location at throw site. |
| stack_trace_object = CaptureCurrentStackTrace( |
| stack_trace_for_uncaught_exceptions_frame_limit_, |
| stack_trace_for_uncaught_exceptions_options_); |
| } |
| } |
| MessageLocation computed_location; |
| if (location == nullptr && |
| (ComputeLocationFromException(&computed_location, exception) || |
| ComputeLocationFromStackTrace(&computed_location, exception) || |
| ComputeLocation(&computed_location))) { |
| location = &computed_location; |
| } |
| |
| return MessageHandler::MakeMessageObject( |
| this, MessageTemplate::kUncaughtException, location, exception, |
| stack_trace_object); |
| } |
| |
| |
| bool Isolate::IsJavaScriptHandlerOnTop(Object* exception) { |
| DCHECK_NE(heap()->the_hole_value(), exception); |
| |
| // For uncatchable exceptions, the JavaScript handler cannot be on top. |
| if (!is_catchable_by_javascript(exception)) return false; |
| |
| // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist. |
| Address entry_handler = Isolate::handler(thread_local_top()); |
| if (entry_handler == nullptr) return false; |
| |
| // Get the address of the external handler so we can compare the address to |
| // determine which one is closer to the top of the stack. |
| Address external_handler = thread_local_top()->try_catch_handler_address(); |
| if (external_handler == nullptr) return true; |
| |
| // The exception has been externally caught if and only if there is an |
| // external handler which is on top of the top-most JS_ENTRY handler. |
| // |
| // Note, that finally clauses would re-throw an exception unless it's aborted |
| // by jumps in control flow (like return, break, etc.) and we'll have another |
| // chance to set proper v8::TryCatch later. |
| return (entry_handler < external_handler); |
| } |
| |
| |
| bool Isolate::IsExternalHandlerOnTop(Object* exception) { |
| DCHECK_NE(heap()->the_hole_value(), exception); |
| |
| // Get the address of the external handler so we can compare the address to |
| // determine which one is closer to the top of the stack. |
| Address external_handler = thread_local_top()->try_catch_handler_address(); |
| if (external_handler == nullptr) return false; |
| |
| // For uncatchable exceptions, the external handler is always on top. |
| if (!is_catchable_by_javascript(exception)) return true; |
| |
| // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist. |
| Address entry_handler = Isolate::handler(thread_local_top()); |
| if (entry_handler == nullptr) return true; |
| |
| // The exception has been externally caught if and only if there is an |
| // external handler which is on top of the top-most JS_ENTRY handler. |
| // |
| // Note, that finally clauses would re-throw an exception unless it's aborted |
| // by jumps in control flow (like return, break, etc.) and we'll have another |
| // chance to set proper v8::TryCatch later. |
| return (entry_handler > external_handler); |
| } |
| |
| void Isolate::ReportPendingMessagesImpl(bool report_externally) { |
| Object* exception = pending_exception(); |
| |
| // Clear the pending message object early to avoid endless recursion. |
| Object* message_obj = thread_local_top_.pending_message_obj_; |
| clear_pending_message(); |
| |
| // For uncatchable exceptions we do nothing. If needed, the exception and the |
| // message have already been propagated to v8::TryCatch. |
| if (!is_catchable_by_javascript(exception)) return; |
| |
| // Determine whether the message needs to be reported to all message handlers |
| // depending on whether and external v8::TryCatch or an internal JavaScript |
| // handler is on top. |
| bool should_report_exception; |
| if (report_externally) { |
| // Only report the exception if the external handler is verbose. |
| should_report_exception = try_catch_handler()->is_verbose_; |
| } else { |
| // Report the exception if it isn't caught by JavaScript code. |
| should_report_exception = !IsJavaScriptHandlerOnTop(exception); |
| } |
| |
| // Actually report the pending message to all message handlers. |
| if (!message_obj->IsTheHole(this) && should_report_exception) { |
| HandleScope scope(this); |
| Handle<JSMessageObject> message(JSMessageObject::cast(message_obj), this); |
| Handle<JSValue> script_wrapper(JSValue::cast(message->script()), this); |
| Handle<Script> script(Script::cast(script_wrapper->value()), this); |
| int start_pos = message->start_position(); |
| int end_pos = message->end_position(); |
| MessageLocation location(script, start_pos, end_pos); |
| MessageHandler::ReportMessage(this, &location, message); |
| } |
| } |
| |
| void Isolate::ReportPendingMessages() { |
| DCHECK(AllowExceptions::IsAllowed(this)); |
| |
| // The embedder might run script in response to an exception. |
| AllowJavascriptExecutionDebugOnly allow_script(this); |
| |
| Object* exception = pending_exception(); |
| |
| // Try to propagate the exception to an external v8::TryCatch handler. If |
| // propagation was unsuccessful, then we will get another chance at reporting |
| // the pending message if the exception is re-thrown. |
| bool has_been_propagated = PropagatePendingExceptionToExternalTryCatch(); |
| if (!has_been_propagated) return; |
| |
| ReportPendingMessagesImpl(IsExternalHandlerOnTop(exception)); |
| } |
| |
| void Isolate::ReportPendingMessagesFromJavaScript() { |
| DCHECK(AllowExceptions::IsAllowed(this)); |
| |
| auto IsHandledByJavaScript = [=]() { |
| // In this situation, the exception is always a non-terminating exception. |
| |
| // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist. |
| Address entry_handler = Isolate::handler(thread_local_top()); |
| DCHECK_NOT_NULL(entry_handler); |
| entry_handler = |
| reinterpret_cast<StackHandler*>(entry_handler)->next()->address(); |
| |
| // Get the address of the external handler so we can compare the address to |
| // determine which one is closer to the top of the stack. |
| Address external_handler = thread_local_top()->try_catch_handler_address(); |
| if (external_handler == nullptr) return true; |
| |
| return (entry_handler < external_handler); |
| }; |
| |
| auto IsHandledExternally = [=]() { |
| Address external_handler = thread_local_top()->try_catch_handler_address(); |
| if (external_handler == nullptr) return false; |
| |
| // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist. |
| Address entry_handler = Isolate::handler(thread_local_top()); |
| DCHECK_NOT_NULL(entry_handler); |
| entry_handler = |
| reinterpret_cast<StackHandler*>(entry_handler)->next()->address(); |
| return (entry_handler > external_handler); |
| }; |
| |
| auto PropagateToExternalHandler = [=]() { |
| if (IsHandledByJavaScript()) { |
| thread_local_top_.external_caught_exception_ = false; |
| return false; |
| } |
| |
| if (!IsHandledExternally()) { |
| thread_local_top_.external_caught_exception_ = false; |
| return true; |
| } |
| |
| thread_local_top_.external_caught_exception_ = true; |
| v8::TryCatch* handler = try_catch_handler(); |
| DCHECK(thread_local_top_.pending_message_obj_->IsJSMessageObject() || |
| thread_local_top_.pending_message_obj_->IsTheHole(this)); |
| handler->can_continue_ = true; |
| handler->has_terminated_ = false; |
| handler->exception_ = pending_exception(); |
| // Propagate to the external try-catch only if we got an actual message. |
| if (thread_local_top_.pending_message_obj_->IsTheHole(this)) return true; |
| |
| handler->message_obj_ = thread_local_top_.pending_message_obj_; |
| return true; |
| }; |
| |
| // Try to propagate to an external v8::TryCatch handler. |
| if (!PropagateToExternalHandler()) return; |
| |
| ReportPendingMessagesImpl(true); |
| } |
| |
| MessageLocation Isolate::GetMessageLocation() { |
| DCHECK(has_pending_exception()); |
| |
| if (thread_local_top_.pending_exception_ != heap()->termination_exception() && |
| !thread_local_top_.pending_message_obj_->IsTheHole(this)) { |
| Handle<JSMessageObject> message_obj( |
| JSMessageObject::cast(thread_local_top_.pending_message_obj_), this); |
| Handle<JSValue> script_wrapper(JSValue::cast(message_obj->script()), this); |
| Handle<Script> script(Script::cast(script_wrapper->value()), this); |
| int start_pos = message_obj->start_position(); |
| int end_pos = message_obj->end_position(); |
| return MessageLocation(script, start_pos, end_pos); |
| } |
| |
| return MessageLocation(); |
| } |
| |
| |
| bool Isolate::OptionalRescheduleException(bool is_bottom_call) { |
| DCHECK(has_pending_exception()); |
| PropagatePendingExceptionToExternalTryCatch(); |
| |
| bool is_termination_exception = |
| pending_exception() == heap_.termination_exception(); |
| |
| // Do not reschedule the exception if this is the bottom call. |
| bool clear_exception = is_bottom_call; |
| |
| if (is_termination_exception) { |
| if (is_bottom_call) { |
| thread_local_top()->external_caught_exception_ = false; |
| clear_pending_exception(); |
| return false; |
| } |
| } else if (thread_local_top()->external_caught_exception_) { |
| // If the exception is externally caught, clear it if there are no |
| // JavaScript frames on the way to the C++ frame that has the |
| // external handler. |
| DCHECK_NOT_NULL(thread_local_top()->try_catch_handler_address()); |
| Address external_handler_address = |
| thread_local_top()->try_catch_handler_address(); |
| JavaScriptFrameIterator it(this); |
| if (it.done() || (it.frame()->sp() > external_handler_address)) { |
| clear_exception = true; |
| } |
| } |
| |
| // Clear the exception if needed. |
| if (clear_exception) { |
| thread_local_top()->external_caught_exception_ = false; |
| clear_pending_exception(); |
| return false; |
| } |
| |
| // Reschedule the exception. |
| thread_local_top()->scheduled_exception_ = pending_exception(); |
| clear_pending_exception(); |
| return true; |
| } |
| |
| void Isolate::PushPromise(Handle<JSObject> promise) { |
| ThreadLocalTop* tltop = thread_local_top(); |
| PromiseOnStack* prev = tltop->promise_on_stack_; |
| Handle<JSObject> global_promise = global_handles()->Create(*promise); |
| tltop->promise_on_stack_ = new PromiseOnStack(global_promise, prev); |
| } |
| |
| |
| void Isolate::PopPromise() { |
| ThreadLocalTop* tltop = thread_local_top(); |
| if (tltop->promise_on_stack_ == nullptr) return; |
| PromiseOnStack* prev = tltop->promise_on_stack_->prev(); |
| Handle<Object> global_promise = tltop->promise_on_stack_->promise(); |
| delete tltop->promise_on_stack_; |
| tltop->promise_on_stack_ = prev; |
| global_handles()->Destroy(global_promise.location()); |
| } |
| |
| namespace { |
| bool InternalPromiseHasUserDefinedRejectHandler(Isolate* isolate, |
| Handle<JSPromise> promise); |
| |
| bool PromiseHandlerCheck(Isolate* isolate, Handle<JSReceiver> handler, |
| Handle<JSReceiver> deferred_promise) { |
| // Recurse to the forwarding Promise, if any. This may be due to |
| // - await reaction forwarding to the throwaway Promise, which has |
| // a dependency edge to the outer Promise. |
| // - PromiseIdResolveHandler forwarding to the output of .then |
| // - Promise.all/Promise.race forwarding to a throwaway Promise, which |
| // has a dependency edge to the generated outer Promise. |
| // Otherwise, this is a real reject handler for the Promise. |
| Handle<Symbol> key = isolate->factory()->promise_forwarding_handler_symbol(); |
| Handle<Object> forwarding_handler = JSReceiver::GetDataProperty(handler, key); |
| if (forwarding_handler->IsUndefined(isolate)) { |
| return true; |
| } |
| |
| if (!deferred_promise->IsJSPromise()) { |
| return true; |
| } |
| |
| return InternalPromiseHasUserDefinedRejectHandler( |
| isolate, Handle<JSPromise>::cast(deferred_promise)); |
| } |
| |
| bool InternalPromiseHasUserDefinedRejectHandler(Isolate* isolate, |
| Handle<JSPromise> promise) { |
| // If this promise was marked as being handled by a catch block |
| // in an async function, then it has a user-defined reject handler. |
| if (promise->handled_hint()) return true; |
| |
| // If this Promise is subsumed by another Promise (a Promise resolved |
| // with another Promise, or an intermediate, hidden, throwaway Promise |
| // within async/await), then recurse on the outer Promise. |
| // In this case, the dependency is one possible way that the Promise |
| // could be resolved, so it does not subsume the other following cases. |
| Handle<Symbol> key = isolate->factory()->promise_handled_by_symbol(); |
| Handle<Object> outer_promise_obj = JSObject::GetDataProperty(promise, key); |
| if (outer_promise_obj->IsJSPromise() && |
| InternalPromiseHasUserDefinedRejectHandler( |
| isolate, Handle<JSPromise>::cast(outer_promise_obj))) { |
| return true; |
| } |
| |
| Handle<Object> queue(promise->reject_reactions(), isolate); |
| Handle<Object> deferred_promise(promise->deferred_promise(), isolate); |
| |
| if (queue->IsUndefined(isolate)) { |
| return false; |
| } |
| |
| if (queue->IsCallable()) { |
| return PromiseHandlerCheck(isolate, Handle<JSReceiver>::cast(queue), |
| Handle<JSReceiver>::cast(deferred_promise)); |
| } |
| |
| if (queue->IsSymbol()) { |
| return InternalPromiseHasUserDefinedRejectHandler( |
| isolate, Handle<JSPromise>::cast(deferred_promise)); |
| } |
| |
| Handle<FixedArray> queue_arr = Handle<FixedArray>::cast(queue); |
| Handle<FixedArray> deferred_promise_arr = |
| Handle<FixedArray>::cast(deferred_promise); |
| for (int i = 0; i < deferred_promise_arr->length(); i++) { |
| Handle<JSReceiver> deferred_promise_item( |
| JSReceiver::cast(deferred_promise_arr->get(i))); |
| if (queue_arr->get(i)->IsSymbol()) { |
| if (InternalPromiseHasUserDefinedRejectHandler( |
| isolate, Handle<JSPromise>::cast(deferred_promise_item))) { |
| return true; |
| } |
| } else { |
| Handle<JSReceiver> queue_item(JSReceiver::cast(queue_arr->get(i))); |
| if (PromiseHandlerCheck(isolate, queue_item, deferred_promise_item)) { |
| return true; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| } // namespace |
| |
| bool Isolate::PromiseHasUserDefinedRejectHandler(Handle<Object> promise) { |
| if (!promise->IsJSPromise()) return false; |
| return InternalPromiseHasUserDefinedRejectHandler( |
| this, Handle<JSPromise>::cast(promise)); |
| } |
| |
| Handle<Object> Isolate::GetPromiseOnStackOnThrow() { |
| Handle<Object> undefined = factory()->undefined_value(); |
| ThreadLocalTop* tltop = thread_local_top(); |
| if (tltop->promise_on_stack_ == nullptr) return undefined; |
| // Find the top-most try-catch or try-finally handler. |
| CatchType prediction = PredictExceptionCatcher(); |
| if (prediction == NOT_CAUGHT || prediction == CAUGHT_BY_EXTERNAL) { |
| return undefined; |
| } |
| Handle<Object> retval = undefined; |
| PromiseOnStack* promise_on_stack = tltop->promise_on_stack_; |
| for (StackFrameIterator it(this); !it.done(); it.Advance()) { |
| StackFrame* frame = it.frame(); |
| HandlerTable::CatchPrediction catch_prediction; |
| if (frame->is_java_script()) { |
| catch_prediction = PredictException(JavaScriptFrame::cast(frame)); |
| } else if (frame->type() == StackFrame::STUB) { |
| Code* code = frame->LookupCode(); |
| if (!code->IsCode() || code->kind() != Code::BUILTIN || |
| !code->handler_table()->length() || !code->is_turbofanned()) { |
| continue; |
| } |
| catch_prediction = code->GetBuiltinCatchPrediction(); |
| } else { |
| continue; |
| } |
| |
| switch (catch_prediction) { |
| case HandlerTable::UNCAUGHT: |
| continue; |
| case HandlerTable::CAUGHT: |
| case HandlerTable::DESUGARING: |
| if (retval->IsJSPromise()) { |
| // Caught the result of an inner async/await invocation. |
| // Mark the inner promise as caught in the "synchronous case" so |
| // that Debug::OnException will see. In the synchronous case, |
| // namely in the code in an async function before the first |
| // await, the function which has this exception event has not yet |
| // returned, so the generated Promise has not yet been marked |
| // by AsyncFunctionAwaitCaught with promiseHandledHintSymbol. |
| Handle<JSPromise>::cast(retval)->set_handled_hint(true); |
| } |
| return retval; |
| case HandlerTable::PROMISE: |
| return promise_on_stack |
| ? Handle<Object>::cast(promise_on_stack->promise()) |
| : undefined; |
| case HandlerTable::ASYNC_AWAIT: { |
| // If in the initial portion of async/await, continue the loop to pop up |
| // successive async/await stack frames until an asynchronous one with |
| // dependents is found, or a non-async stack frame is encountered, in |
| // order to handle the synchronous async/await catch prediction case: |
| // assume that async function calls are awaited. |
| if (!promise_on_stack) return retval; |
| retval = promise_on_stack->promise(); |
| if (PromiseHasUserDefinedRejectHandler(retval)) { |
| return retval; |
| } |
| promise_on_stack = promise_on_stack->prev(); |
| continue; |
| } |
| } |
| } |
| return retval; |
| } |
| |
| |
| void Isolate::SetCaptureStackTraceForUncaughtExceptions( |
| bool capture, |
| int frame_limit, |
| StackTrace::StackTraceOptions options) { |
| capture_stack_trace_for_uncaught_exceptions_ = capture; |
| stack_trace_for_uncaught_exceptions_frame_limit_ = frame_limit; |
| stack_trace_for_uncaught_exceptions_options_ = options; |
| } |
| |
| |
| void Isolate::SetAbortOnUncaughtExceptionCallback( |
| v8::Isolate::AbortOnUncaughtExceptionCallback callback) { |
| abort_on_uncaught_exception_callback_ = callback; |
| } |
| |
| namespace { |
| void AdvanceWhileDebugContext(JavaScriptFrameIterator& it, Debug* debug) { |
| if (!debug->in_debug_scope()) return; |
| |
| while (!it.done()) { |
| Context* context = Context::cast(it.frame()->context()); |
| if (context->native_context() == *debug->debug_context()) { |
| it.Advance(); |
| } else { |
| break; |
| } |
| } |
| } |
| } // namespace |
| |
| Handle<Context> Isolate::GetCallingNativeContext() { |
| JavaScriptFrameIterator it(this); |
| AdvanceWhileDebugContext(it, debug_); |
| if (it.done()) return Handle<Context>::null(); |
| JavaScriptFrame* frame = it.frame(); |
| Context* context = Context::cast(frame->context()); |
| return Handle<Context>(context->native_context(), this); |
| } |
| |
| Handle<Context> Isolate::GetIncumbentContext() { |
| JavaScriptFrameIterator it(this); |
| AdvanceWhileDebugContext(it, debug_); |
| |
| // 1st candidate: most-recently-entered author function's context |
| // if it's newer than the last Context::BackupIncumbentScope entry. |
| if (!it.done() && |
| static_cast<const void*>(it.frame()) > |
| static_cast<const void*>(top_backup_incumbent_scope())) { |
| Context* context = Context::cast(it.frame()->context()); |
| return Handle<Context>(context->native_context(), this); |
| } |
| |
| // 2nd candidate: the last Context::Scope's incumbent context if any. |
| if (top_backup_incumbent_scope()) { |
| return Utils::OpenHandle( |
| *top_backup_incumbent_scope()->backup_incumbent_context_); |
| } |
| |
| // Last candidate: the entered context. |
| // Given that there is no other author function is running, there must be |
| // no cross-context function running, then the incumbent realm must match |
| // the entry realm. |
| v8::Local<v8::Context> entered_context = |
| reinterpret_cast<v8::Isolate*>(this)->GetEnteredContext(); |
| return Utils::OpenHandle(*entered_context); |
| } |
| |
| char* Isolate::ArchiveThread(char* to) { |
| MemCopy(to, reinterpret_cast<char*>(thread_local_top()), |
| sizeof(ThreadLocalTop)); |
| InitializeThreadLocal(); |
| clear_pending_exception(); |
| clear_pending_message(); |
| clear_scheduled_exception(); |
| return to + sizeof(ThreadLocalTop); |
| } |
| |
| |
| char* Isolate::RestoreThread(char* from) { |
| MemCopy(reinterpret_cast<char*>(thread_local_top()), from, |
| sizeof(ThreadLocalTop)); |
| // This might be just paranoia, but it seems to be needed in case a |
| // thread_local_top_ is restored on a separate OS thread. |
| #ifdef USE_SIMULATOR |
| thread_local_top()->simulator_ = Simulator::current(this); |
| #endif |
| DCHECK(context() == nullptr || context()->IsContext()); |
| return from + sizeof(ThreadLocalTop); |
| } |
| |
| Isolate::ThreadDataTable::ThreadDataTable() : list_(nullptr) {} |
| |
| Isolate::ThreadDataTable::~ThreadDataTable() { |
| // TODO(svenpanne) The assertion below would fire if an embedder does not |
| // cleanly dispose all Isolates before disposing v8, so we are conservative |
| // and leave it out for now. |
| // DCHECK_NULL(list_); |
| } |
| |
| void Isolate::ReleaseManagedObjects() { |
| Isolate::ManagedObjectFinalizer* current = |
| managed_object_finalizers_list_.next_; |
| managed_object_finalizers_list_.next_ = nullptr; |
| while (current != nullptr) { |
| Isolate::ManagedObjectFinalizer* next = current->next_; |
| current->Dispose(); |
| current = next; |
| } |
| // No new managed objects should pop up during finalization. |
| DCHECK_NULL(managed_object_finalizers_list_.next_); |
| } |
| |
| void Isolate::RegisterForReleaseAtTeardown( |
| Isolate::ManagedObjectFinalizer* finalizer) { |
| DCHECK_NOT_NULL(finalizer->value_); |
| DCHECK_NOT_NULL(finalizer->deleter_); |
| DCHECK_NULL(finalizer->prev_); |
| DCHECK_NULL(finalizer->next_); |
| |
| // Insert at head. We keep the head alive for the lifetime of the Isolate |
| // because otherwise we can't reset the head, should we delete it before |
| // the isolate expires |
| Isolate::ManagedObjectFinalizer* next = managed_object_finalizers_list_.next_; |
| managed_object_finalizers_list_.next_ = finalizer; |
| finalizer->prev_ = &managed_object_finalizers_list_; |
| finalizer->next_ = next; |
| if (next != nullptr) next->prev_ = finalizer; |
| } |
| |
| void Isolate::UnregisterFromReleaseAtTeardown( |
| Isolate::ManagedObjectFinalizer* finalizer) { |
| DCHECK_NOT_NULL(finalizer); |
| DCHECK_NOT_NULL(finalizer->prev_); |
| |
| finalizer->prev_->next_ = finalizer->next_; |
| if (finalizer->next_ != nullptr) finalizer->next_->prev_ = finalizer->prev_; |
| } |
| |
| Isolate::PerIsolateThreadData::~PerIsolateThreadData() { |
| #if defined(USE_SIMULATOR) |
| delete simulator_; |
| #endif |
| } |
| |
| |
| Isolate::PerIsolateThreadData* |
| Isolate::ThreadDataTable::Lookup(Isolate* isolate, |
| ThreadId thread_id) { |
| for (PerIsolateThreadData* data = list_; data != nullptr; |
| data = data->next_) { |
| if (data->Matches(isolate, thread_id)) return data; |
| } |
| return nullptr; |
| } |
| |
| |
| void Isolate::ThreadDataTable::Insert(Isolate::PerIsolateThreadData* data) { |
| if (list_ != nullptr) list_->prev_ = data; |
| data->next_ = list_; |
| list_ = data; |
| } |
| |
| |
| void Isolate::ThreadDataTable::Remove(PerIsolateThreadData* data) { |
| if (list_ == data) list_ = data->next_; |
| if (data->next_ != nullptr) data->next_->prev_ = data->prev_; |
| if (data->prev_ != nullptr) data->prev_->next_ = data->next_; |
| delete data; |
| } |
| |
| |
| void Isolate::ThreadDataTable::RemoveAllThreads(Isolate* isolate) { |
| PerIsolateThreadData* data = list_; |
| while (data != nullptr) { |
| PerIsolateThreadData* next = data->next_; |
| if (data->isolate() == isolate) Remove(data); |
| data = next; |
| } |
| } |
| |
| |
| #ifdef DEBUG |
| #define TRACE_ISOLATE(tag) \ |
| do { \ |
| if (FLAG_trace_isolates) { \ |
| PrintF("Isolate %p (id %d)" #tag "\n", \ |
| reinterpret_cast<void*>(this), id()); \ |
| } \ |
| } while (false) |
| #else |
| #define TRACE_ISOLATE(tag) |
| #endif |
| |
| class VerboseAccountingAllocator : public AccountingAllocator { |
| public: |
| VerboseAccountingAllocator(Heap* heap, size_t allocation_sample_bytes, |
| size_t pool_sample_bytes) |
| : heap_(heap), |
| last_memory_usage_(0), |
| last_pool_size_(0), |
| nesting_deepth_(0), |
| allocation_sample_bytes_(allocation_sample_bytes), |
| pool_sample_bytes_(pool_sample_bytes) {} |
| |
| v8::internal::Segment* GetSegment(size_t size) override { |
| v8::internal::Segment* memory = AccountingAllocator::GetSegment(size); |
| if (memory) { |
| size_t malloced_current = GetCurrentMemoryUsage(); |
| size_t pooled_current = GetCurrentPoolSize(); |
| |
| if (last_memory_usage_.Value() + allocation_sample_bytes_ < |
| malloced_current || |
| last_pool_size_.Value() + pool_sample_bytes_ < pooled_current) { |
| PrintMemoryJSON(malloced_current, pooled_current); |
| last_memory_usage_.SetValue(malloced_current); |
| last_pool_size_.SetValue(pooled_current); |
| } |
| } |
| return memory; |
| } |
| |
| void ReturnSegment(v8::internal::Segment* memory) override { |
| AccountingAllocator::ReturnSegment(memory); |
| size_t malloced_current = GetCurrentMemoryUsage(); |
| size_t pooled_current = GetCurrentPoolSize(); |
| |
| if (malloced_current + allocation_sample_bytes_ < |
| last_memory_usage_.Value() || |
| pooled_current + pool_sample_bytes_ < last_pool_size_.Value()) { |
| PrintMemoryJSON(malloced_current, pooled_current); |
| last_memory_usage_.SetValue(malloced_current); |
| last_pool_size_.SetValue(pooled_current); |
| } |
| } |
| |
| void ZoneCreation(const Zone* zone) override { |
| PrintZoneModificationSample(zone, "zonecreation"); |
| nesting_deepth_.Increment(1); |
| } |
| |
| void ZoneDestruction(const Zone* zone) override { |
| nesting_deepth_.Decrement(1); |
| PrintZoneModificationSample(zone, "zonedestruction"); |
| } |
| |
| private: |
| void PrintZoneModificationSample(const Zone* zone, const char* type) { |
| PrintF( |
| "{" |
| "\"type\": \"%s\", " |
| "\"isolate\": \"%p\", " |
| "\"time\": %f, " |
| "\"ptr\": \"%p\", " |
| "\"name\": \"%s\", " |
| "\"size\": %" PRIuS |
| "," |
| "\"nesting\": %" PRIuS "}\n", |
| type, reinterpret_cast<void*>(heap_->isolate()), |
| heap_->isolate()->time_millis_since_init(), |
| reinterpret_cast<const void*>(zone), zone->name(), |
| zone->allocation_size(), nesting_deepth_.Value()); |
| } |
| |
| void PrintMemoryJSON(size_t malloced, size_t pooled) { |
| // Note: Neither isolate, nor heap is locked, so be careful with accesses |
| // as the allocator is potentially used on a concurrent thread. |
| double time = heap_->isolate()->time_millis_since_init(); |
| PrintF( |
| "{" |
| "\"type\": \"zone\", " |
| "\"isolate\": \"%p\", " |
| "\"time\": %f, " |
| "\"allocated\": %" PRIuS |
| "," |
| "\"pooled\": %" PRIuS "}\n", |
| reinterpret_cast<void*>(heap_->isolate()), time, malloced, pooled); |
| } |
| |
| Heap* heap_; |
| base::AtomicNumber<size_t> last_memory_usage_; |
| base::AtomicNumber<size_t> last_pool_size_; |
| base::AtomicNumber<size_t> nesting_deepth_; |
| size_t allocation_sample_bytes_, pool_sample_bytes_; |
| }; |
| |
| #ifdef DEBUG |
| base::AtomicNumber<size_t> Isolate::non_disposed_isolates_; |
| #endif // DEBUG |
| |
| Isolate::Isolate(bool enable_serializer) |
| : embedder_data_(), |
| entry_stack_(nullptr), |
| stack_trace_nesting_level_(0), |
| incomplete_message_(nullptr), |
| bootstrapper_(nullptr), |
| runtime_profiler_(nullptr), |
| compilation_cache_(nullptr), |
| logger_(nullptr), |
| load_stub_cache_(nullptr), |
| store_stub_cache_(nullptr), |
| deoptimizer_data_(nullptr), |
| deoptimizer_lazy_throw_(false), |
| materialized_object_store_(nullptr), |
| capture_stack_trace_for_uncaught_exceptions_(false), |
| stack_trace_for_uncaught_exceptions_frame_limit_(0), |
| stack_trace_for_uncaught_exceptions_options_(StackTrace::kOverview), |
| context_slot_cache_(nullptr), |
| descriptor_lookup_cache_(nullptr), |
| handle_scope_implementer_(nullptr), |
| unicode_cache_(nullptr), |
| allocator_(FLAG_trace_zone_stats ? new VerboseAccountingAllocator( |
| &heap_, 256 * KB, 128 * KB) |
| : new AccountingAllocator()), |
| inner_pointer_to_code_cache_(nullptr), |
| global_handles_(nullptr), |
| eternal_handles_(nullptr), |
| thread_manager_(nullptr), |
| setup_delegate_(nullptr), |
| regexp_stack_(nullptr), |
| date_cache_(nullptr), |
| call_descriptor_data_(nullptr), |
| // TODO(bmeurer) Initialized lazily because it depends on flags; can |
| // be fixed once the default isolate cleanup is done. |
| random_number_generator_(nullptr), |
| fuzzer_rng_(nullptr), |
| rail_mode_(PERFORMANCE_ANIMATION), |
| promise_hook_or_debug_is_active_(false), |
| promise_hook_(nullptr), |
| load_start_time_ms_(0), |
| serializer_enabled_(enable_serializer), |
| has_fatal_error_(false), |
| initialized_from_snapshot_(false), |
| is_tail_call_elimination_enabled_(true), |
| is_isolate_in_background_(false), |
| cpu_profiler_(nullptr), |
| heap_profiler_(nullptr), |
| code_event_dispatcher_(new CodeEventDispatcher()), |
| function_entry_hook_(nullptr), |
| deferred_handles_head_(nullptr), |
| optimizing_compile_dispatcher_(nullptr), |
| stress_deopt_count_(0), |
| force_slow_path_(false), |
| next_optimization_id_(0), |
| #if V8_SFI_HAS_UNIQUE_ID |
| next_unique_sfi_id_(0), |
| #endif |
| is_running_microtasks_(false), |
| use_counter_callback_(nullptr), |
| basic_block_profiler_(nullptr), |
| cancelable_task_manager_(new CancelableTaskManager()), |
| abort_on_uncaught_exception_callback_(nullptr), |
| total_regexp_code_generated_(0) { |
| { |
| base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer()); |
| CHECK(thread_data_table_); |
| } |
| id_ = base::Relaxed_AtomicIncrement(&isolate_counter_, 1); |
| TRACE_ISOLATE(constructor); |
| |
| memset(isolate_addresses_, 0, |
| sizeof(isolate_addresses_[0]) * (kIsolateAddressCount + 1)); |
| |
| heap_.isolate_ = this; |
| stack_guard_.isolate_ = this; |
| |
| // ThreadManager is initialized early to support locking an isolate |
| // before it is entered. |
| thread_manager_ = new ThreadManager(); |
| thread_manager_->isolate_ = this; |
| |
| #ifdef DEBUG |
| non_disposed_isolates_.Increment(1); |
| #endif // DEBUG |
| |
| handle_scope_data_.Initialize(); |
| |
| #define ISOLATE_INIT_EXECUTE(type, name, initial_value) \ |
| name##_ = (initial_value); |
| ISOLATE_INIT_LIST(ISOLATE_INIT_EXECUTE) |
| #undef ISOLATE_INIT_EXECUTE |
| |
| #define ISOLATE_INIT_ARRAY_EXECUTE(type, name, length) \ |
| memset(name##_, 0, sizeof(type) * length); |
| ISOLATE_INIT_ARRAY_LIST(ISOLATE_INIT_ARRAY_EXECUTE) |
| #undef ISOLATE_INIT_ARRAY_EXECUTE |
| |
| InitializeLoggingAndCounters(); |
| debug_ = new Debug(this); |
| |
| tracing_cpu_profiler_.reset(new TracingCpuProfilerImpl(this)); |
| |
| init_memcopy_functions(this); |
| } |
| |
| |
| void Isolate::TearDown() { |
| TRACE_ISOLATE(tear_down); |
| |
| tracing_cpu_profiler_.reset(); |
| if (FLAG_stress_sampling_allocation_profiler > 0) { |
| heap_profiler()->StopSamplingHeapProfiler(); |
| } |
| |
| // Temporarily set this isolate as current so that various parts of |
| // the isolate can access it in their destructors without having a |
| // direct pointer. We don't use Enter/Exit here to avoid |
| // initializing the thread data. |
| PerIsolateThreadData* saved_data = CurrentPerIsolateThreadData(); |
| DCHECK_EQ(base::Relaxed_Load(&isolate_key_created_), 1); |
| Isolate* saved_isolate = |
| reinterpret_cast<Isolate*>(base::Thread::GetThreadLocal(isolate_key_)); |
| SetIsolateThreadLocals(this, nullptr); |
| |
| Deinit(); |
| |
| { |
| base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer()); |
| thread_data_table_->RemoveAllThreads(this); |
| } |
| |
| #ifdef DEBUG |
| non_disposed_isolates_.Decrement(1); |
| #endif // DEBUG |
| |
| delete this; |
| |
| // Restore the previous current isolate. |
| SetIsolateThreadLocals(saved_isolate, saved_data); |
| } |
| |
| |
| void Isolate::GlobalTearDown() { |
| delete thread_data_table_; |
| thread_data_table_ = nullptr; |
| } |
| |
| |
| void Isolate::ClearSerializerData() { |
| delete external_reference_table_; |
| external_reference_table_ = nullptr; |
| delete external_reference_map_; |
| external_reference_map_ = nullptr; |
| } |
| |
| |
| void Isolate::Deinit() { |
| TRACE_ISOLATE(deinit); |
| |
| debug()->Unload(); |
| |
| if (concurrent_recompilation_enabled()) { |
| optimizing_compile_dispatcher_->Stop(); |
| delete optimizing_compile_dispatcher_; |
| optimizing_compile_dispatcher_ = nullptr; |
| } |
| |
| wasm_engine()->compilation_manager()->TearDown(); |
| |
| heap_.mark_compact_collector()->EnsureSweepingCompleted(); |
| heap_.memory_allocator()->unmapper()->WaitUntilCompleted(); |
| |
| DumpAndResetStats(); |
| |
| if (FLAG_print_deopt_stress) { |
| PrintF(stdout, "=== Stress deopt counter: %u\n", stress_deopt_count_); |
| } |
| |
| if (cpu_profiler_) { |
| cpu_profiler_->DeleteAllProfiles(); |
| } |
| |
| // We must stop the logger before we tear down other components. |
| sampler::Sampler* sampler = logger_->sampler(); |
| if (sampler && sampler->IsActive()) sampler->Stop(); |
| |
| FreeThreadResources(); |
| // Release managed objects before shutting down the heap. The finalizer might |
| // need to access heap objects. |
| ReleaseManagedObjects(); |
| |
| delete deoptimizer_data_; |
| deoptimizer_data_ = nullptr; |
| builtins_.TearDown(); |
| bootstrapper_->TearDown(); |
| |
| if (runtime_profiler_ != nullptr) { |
| delete runtime_profiler_; |
| runtime_profiler_ = nullptr; |
| } |
| |
| delete basic_block_profiler_; |
| basic_block_profiler_ = nullptr; |
| |
| delete heap_profiler_; |
| heap_profiler_ = nullptr; |
| |
| compiler_dispatcher_->AbortAll(CompilerDispatcher::BlockingBehavior::kBlock); |
| delete compiler_dispatcher_; |
| compiler_dispatcher_ = nullptr; |
| |
| cancelable_task_manager()->CancelAndWait(); |
| |
| heap_.TearDown(); |
| logger_->TearDown(); |
| |
| delete interpreter_; |
| interpreter_ = nullptr; |
| |
| delete ast_string_constants_; |
| ast_string_constants_ = nullptr; |
| |
| delete cpu_profiler_; |
| cpu_profiler_ = nullptr; |
| |
| code_event_dispatcher_.reset(); |
| |
| delete root_index_map_; |
| root_index_map_ = nullptr; |
| |
| ClearSerializerData(); |
| } |
| |
| |
| void Isolate::SetIsolateThreadLocals(Isolate* isolate, |
| PerIsolateThreadData* data) { |
| base::Thread::SetThreadLocal(isolate_key_, isolate); |
| base::Thread::SetThreadLocal(per_isolate_thread_data_key_, data); |
| } |
| |
| |
| Isolate::~Isolate() { |
| TRACE_ISOLATE(destructor); |
| |
| // The entry stack must be empty when we get here. |
| DCHECK(entry_stack_ == nullptr || entry_stack_->previous_item == nullptr); |
| |
| delete entry_stack_; |
| entry_stack_ = nullptr; |
| |
| delete unicode_cache_; |
| unicode_cache_ = nullptr; |
| |
| delete date_cache_; |
| date_cache_ = nullptr; |
| |
| delete[] call_descriptor_data_; |
| call_descriptor_data_ = nullptr; |
| |
| delete regexp_stack_; |
| regexp_stack_ = nullptr; |
| |
| delete descriptor_lookup_cache_; |
| descriptor_lookup_cache_ = nullptr; |
| delete context_slot_cache_; |
| context_slot_cache_ = nullptr; |
| |
| delete load_stub_cache_; |
| load_stub_cache_ = nullptr; |
| delete store_stub_cache_; |
| store_stub_cache_ = nullptr; |
| |
| delete materialized_object_store_; |
| materialized_object_store_ = nullptr; |
| |
| delete logger_; |
| logger_ = nullptr; |
| |
| delete handle_scope_implementer_; |
| handle_scope_implementer_ = nullptr; |
| |
| delete code_tracer(); |
| set_code_tracer(nullptr); |
| |
| delete compilation_cache_; |
| compilation_cache_ = nullptr; |
| delete bootstrapper_; |
| bootstrapper_ = nullptr; |
| delete inner_pointer_to_code_cache_; |
| inner_pointer_to_code_cache_ = nullptr; |
| |
| delete thread_manager_; |
| thread_manager_ = nullptr; |
| |
| delete global_handles_; |
| global_handles_ = nullptr; |
| delete eternal_handles_; |
| eternal_handles_ = nullptr; |
| |
| delete string_stream_debug_object_cache_; |
| string_stream_debug_object_cache_ = nullptr; |
| |
| delete random_number_generator_; |
| random_number_generator_ = nullptr; |
| |
| delete fuzzer_rng_; |
| fuzzer_rng_ = nullptr; |
| |
| delete debug_; |
| debug_ = nullptr; |
| |
| delete cancelable_task_manager_; |
| cancelable_task_manager_ = nullptr; |
| |
| delete allocator_; |
| allocator_ = nullptr; |
| |
| #if USE_SIMULATOR |
| Simulator::TearDown(simulator_i_cache_); |
| simulator_i_cache_ = nullptr; |
| #endif |
| } |
| |
| |
| void Isolate::InitializeThreadLocal() { |
| thread_local_top_.isolate_ = this; |
| thread_local_top_.Initialize(); |
| } |
| |
| |
| bool Isolate::PropagatePendingExceptionToExternalTryCatch() { |
| Object* exception = pending_exception(); |
| |
| if (IsJavaScriptHandlerOnTop(exception)) { |
| thread_local_top_.external_caught_exception_ = false; |
| return false; |
| } |
| |
| if (!IsExternalHandlerOnTop(exception)) { |
| thread_local_top_.external_caught_exception_ = false; |
| return true; |
| } |
| |
| thread_local_top_.external_caught_exception_ = true; |
| if (!is_catchable_by_javascript(exception)) { |
| try_catch_handler()->can_continue_ = false; |
| try_catch_handler()->has_terminated_ = true; |
| try_catch_handler()->exception_ = heap()->null_value(); |
| } else { |
| v8::TryCatch* handler = try_catch_handler(); |
| DCHECK(thread_local_top_.pending_message_obj_->IsJSMessageObject() || |
| thread_local_top_.pending_message_obj_->IsTheHole(this)); |
| handler->can_continue_ = true; |
| handler->has_terminated_ = false; |
| handler->exception_ = pending_exception(); |
| // Propagate to the external try-catch only if we got an actual message. |
| if (thread_local_top_.pending_message_obj_->IsTheHole(this)) return true; |
| |
| handler->message_obj_ = thread_local_top_.pending_message_obj_; |
| } |
| return true; |
| } |
| |
| bool Isolate::InitializeCounters() { |
| if (async_counters_) return false; |
| async_counters_ = std::make_shared<Counters>(this); |
| return true; |
| } |
| |
| void Isolate::InitializeLoggingAndCounters() { |
| if (logger_ == nullptr) { |
| logger_ = new Logger(this); |
| } |
| InitializeCounters(); |
| } |
| |
| namespace { |
| void PrintBuiltinSizes(Isolate* isolate) { |
| Builtins* builtins = isolate->builtins(); |
| for (int i = 0; i < Builtins::builtin_count; i++) { |
| const char* name = builtins->name(i); |
| const char* kind = Builtins::KindNameOf(i); |
| Code* code = builtins->builtin(i); |
| |