2f3a171adc
There were a couple of issues with it: - interpreter is not supported - the source position was just accidentally correct for full-codegen - the eval origin could have been cached Also fixes a few other places to use AbstractCode. R=mstarzinger@chromium.org Review URL: https://codereview.chromium.org/1854713002 Cr-Commit-Position: refs/heads/master@{#35257}
3006 lines
102 KiB
C++
3006 lines
102 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/isolate.h"
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#include <stdlib.h>
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#include <fstream> // NOLINT(readability/streams)
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#include <sstream>
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#include "src/ast/ast.h"
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#include "src/ast/scopeinfo.h"
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#include "src/base/platform/platform.h"
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#include "src/base/sys-info.h"
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#include "src/base/utils/random-number-generator.h"
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#include "src/basic-block-profiler.h"
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#include "src/bootstrapper.h"
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#include "src/codegen.h"
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#include "src/compilation-cache.h"
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#include "src/compilation-statistics.h"
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#include "src/crankshaft/hydrogen.h"
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#include "src/debug/debug.h"
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#include "src/deoptimizer.h"
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#include "src/external-reference-table.h"
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#include "src/frames-inl.h"
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#include "src/ic/stub-cache.h"
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#include "src/interpreter/interpreter.h"
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#include "src/isolate-inl.h"
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#include "src/log.h"
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#include "src/messages.h"
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#include "src/profiler/cpu-profiler.h"
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#include "src/profiler/sampler.h"
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#include "src/prototype.h"
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#include "src/regexp/regexp-stack.h"
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#include "src/runtime-profiler.h"
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#include "src/simulator.h"
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#include "src/snapshot/deserializer.h"
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#include "src/v8.h"
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#include "src/version.h"
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#include "src/vm-state-inl.h"
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namespace v8 {
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namespace internal {
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base::Atomic32 ThreadId::highest_thread_id_ = 0;
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int ThreadId::AllocateThreadId() {
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int new_id = base::NoBarrier_AtomicIncrement(&highest_thread_id_, 1);
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return new_id;
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}
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int ThreadId::GetCurrentThreadId() {
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int thread_id = base::Thread::GetThreadLocalInt(Isolate::thread_id_key_);
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if (thread_id == 0) {
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thread_id = AllocateThreadId();
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base::Thread::SetThreadLocalInt(Isolate::thread_id_key_, thread_id);
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}
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return thread_id;
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}
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ThreadLocalTop::ThreadLocalTop() {
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InitializeInternal();
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}
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void ThreadLocalTop::InitializeInternal() {
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c_entry_fp_ = 0;
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c_function_ = 0;
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handler_ = 0;
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#ifdef USE_SIMULATOR
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simulator_ = NULL;
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#endif
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js_entry_sp_ = NULL;
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external_callback_scope_ = NULL;
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current_vm_state_ = EXTERNAL;
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try_catch_handler_ = NULL;
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context_ = NULL;
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thread_id_ = ThreadId::Invalid();
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external_caught_exception_ = false;
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failed_access_check_callback_ = NULL;
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save_context_ = NULL;
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promise_on_stack_ = NULL;
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// These members are re-initialized later after deserialization
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// is complete.
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pending_exception_ = NULL;
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rethrowing_message_ = false;
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pending_message_obj_ = NULL;
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scheduled_exception_ = NULL;
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}
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void ThreadLocalTop::Initialize() {
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InitializeInternal();
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#ifdef USE_SIMULATOR
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simulator_ = Simulator::current(isolate_);
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#endif
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thread_id_ = ThreadId::Current();
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}
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void ThreadLocalTop::Free() {
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// Match unmatched PopPromise calls.
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while (promise_on_stack_) isolate_->PopPromise();
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}
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base::Thread::LocalStorageKey Isolate::isolate_key_;
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base::Thread::LocalStorageKey Isolate::thread_id_key_;
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base::Thread::LocalStorageKey Isolate::per_isolate_thread_data_key_;
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base::LazyMutex Isolate::thread_data_table_mutex_ = LAZY_MUTEX_INITIALIZER;
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Isolate::ThreadDataTable* Isolate::thread_data_table_ = NULL;
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base::Atomic32 Isolate::isolate_counter_ = 0;
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#if DEBUG
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base::Atomic32 Isolate::isolate_key_created_ = 0;
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#endif
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Isolate::PerIsolateThreadData*
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Isolate::FindOrAllocatePerThreadDataForThisThread() {
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ThreadId thread_id = ThreadId::Current();
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PerIsolateThreadData* per_thread = NULL;
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{
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base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
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per_thread = thread_data_table_->Lookup(this, thread_id);
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if (per_thread == NULL) {
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per_thread = new PerIsolateThreadData(this, thread_id);
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thread_data_table_->Insert(per_thread);
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}
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DCHECK(thread_data_table_->Lookup(this, thread_id) == per_thread);
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}
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return per_thread;
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}
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void Isolate::DiscardPerThreadDataForThisThread() {
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int thread_id_int = base::Thread::GetThreadLocalInt(Isolate::thread_id_key_);
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if (thread_id_int) {
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ThreadId thread_id = ThreadId(thread_id_int);
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DCHECK(!thread_manager_->mutex_owner_.Equals(thread_id));
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base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
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PerIsolateThreadData* per_thread =
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thread_data_table_->Lookup(this, thread_id);
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if (per_thread) {
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DCHECK(!per_thread->thread_state_);
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thread_data_table_->Remove(per_thread);
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}
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}
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}
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Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThisThread() {
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ThreadId thread_id = ThreadId::Current();
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return FindPerThreadDataForThread(thread_id);
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}
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Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThread(
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ThreadId thread_id) {
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PerIsolateThreadData* per_thread = NULL;
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{
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base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
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per_thread = thread_data_table_->Lookup(this, thread_id);
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}
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return per_thread;
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}
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void Isolate::InitializeOncePerProcess() {
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base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
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CHECK(thread_data_table_ == NULL);
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isolate_key_ = base::Thread::CreateThreadLocalKey();
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#if DEBUG
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base::NoBarrier_Store(&isolate_key_created_, 1);
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#endif
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thread_id_key_ = base::Thread::CreateThreadLocalKey();
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per_isolate_thread_data_key_ = base::Thread::CreateThreadLocalKey();
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thread_data_table_ = new Isolate::ThreadDataTable();
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}
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Address Isolate::get_address_from_id(Isolate::AddressId id) {
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return isolate_addresses_[id];
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}
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char* Isolate::Iterate(ObjectVisitor* v, char* thread_storage) {
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ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage);
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Iterate(v, thread);
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return thread_storage + sizeof(ThreadLocalTop);
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}
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void Isolate::IterateThread(ThreadVisitor* v, char* t) {
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ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(t);
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v->VisitThread(this, thread);
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}
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void Isolate::Iterate(ObjectVisitor* v, ThreadLocalTop* thread) {
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// Visit the roots from the top for a given thread.
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v->VisitPointer(&thread->pending_exception_);
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v->VisitPointer(&(thread->pending_message_obj_));
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v->VisitPointer(bit_cast<Object**>(&(thread->context_)));
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v->VisitPointer(&thread->scheduled_exception_);
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for (v8::TryCatch* block = thread->try_catch_handler();
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block != NULL;
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block = block->next_) {
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v->VisitPointer(bit_cast<Object**>(&(block->exception_)));
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v->VisitPointer(bit_cast<Object**>(&(block->message_obj_)));
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}
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// Iterate over pointers on native execution stack.
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for (StackFrameIterator it(this, thread); !it.done(); it.Advance()) {
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it.frame()->Iterate(v);
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}
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}
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void Isolate::Iterate(ObjectVisitor* v) {
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ThreadLocalTop* current_t = thread_local_top();
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Iterate(v, current_t);
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}
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void Isolate::IterateDeferredHandles(ObjectVisitor* visitor) {
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for (DeferredHandles* deferred = deferred_handles_head_;
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deferred != NULL;
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deferred = deferred->next_) {
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deferred->Iterate(visitor);
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}
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}
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#ifdef DEBUG
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bool Isolate::IsDeferredHandle(Object** handle) {
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// Each DeferredHandles instance keeps the handles to one job in the
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// concurrent recompilation queue, containing a list of blocks. Each block
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// contains kHandleBlockSize handles except for the first block, which may
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// not be fully filled.
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// We iterate through all the blocks to see whether the argument handle
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// belongs to one of the blocks. If so, it is deferred.
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for (DeferredHandles* deferred = deferred_handles_head_;
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deferred != NULL;
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deferred = deferred->next_) {
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List<Object**>* blocks = &deferred->blocks_;
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for (int i = 0; i < blocks->length(); i++) {
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Object** block_limit = (i == 0) ? deferred->first_block_limit_
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: blocks->at(i) + kHandleBlockSize;
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if (blocks->at(i) <= handle && handle < block_limit) return true;
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}
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}
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return false;
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}
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#endif // DEBUG
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void Isolate::RegisterTryCatchHandler(v8::TryCatch* that) {
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thread_local_top()->set_try_catch_handler(that);
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}
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void Isolate::UnregisterTryCatchHandler(v8::TryCatch* that) {
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DCHECK(thread_local_top()->try_catch_handler() == that);
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thread_local_top()->set_try_catch_handler(that->next_);
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}
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Handle<String> Isolate::StackTraceString() {
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if (stack_trace_nesting_level_ == 0) {
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stack_trace_nesting_level_++;
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HeapStringAllocator allocator;
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StringStream::ClearMentionedObjectCache(this);
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StringStream accumulator(&allocator);
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incomplete_message_ = &accumulator;
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PrintStack(&accumulator);
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Handle<String> stack_trace = accumulator.ToString(this);
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incomplete_message_ = NULL;
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stack_trace_nesting_level_ = 0;
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return stack_trace;
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} else if (stack_trace_nesting_level_ == 1) {
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stack_trace_nesting_level_++;
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base::OS::PrintError(
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"\n\nAttempt to print stack while printing stack (double fault)\n");
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base::OS::PrintError(
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"If you are lucky you may find a partial stack dump on stdout.\n\n");
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incomplete_message_->OutputToStdOut();
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return factory()->empty_string();
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} else {
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base::OS::Abort();
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// Unreachable
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return factory()->empty_string();
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}
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}
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void Isolate::PushStackTraceAndDie(unsigned int magic, void* ptr1, void* ptr2,
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unsigned int magic2) {
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const int kMaxStackTraceSize = 32 * KB;
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Handle<String> trace = StackTraceString();
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uint8_t buffer[kMaxStackTraceSize];
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int length = Min(kMaxStackTraceSize - 1, trace->length());
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String::WriteToFlat(*trace, buffer, 0, length);
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buffer[length] = '\0';
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// TODO(dcarney): convert buffer to utf8?
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base::OS::PrintError("Stacktrace (%x-%x) %p %p: %s\n", magic, magic2, ptr1,
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ptr2, reinterpret_cast<char*>(buffer));
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base::OS::Abort();
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}
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// Determines whether the given stack frame should be displayed in
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// a stack trace. The caller is the error constructor that asked
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// for the stack trace to be collected. The first time a construct
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// call to this function is encountered it is skipped. The seen_caller
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// in/out parameter is used to remember if the caller has been seen
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// yet.
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static bool IsVisibleInStackTrace(JSFunction* fun,
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Object* caller,
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Object* receiver,
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bool* seen_caller) {
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if ((fun == caller) && !(*seen_caller)) {
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*seen_caller = true;
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return false;
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}
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// Skip all frames until we've seen the caller.
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if (!(*seen_caller)) return false;
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// Functions defined in native scripts are not visible unless directly
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// exposed, in which case the native flag is set.
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// The --builtins-in-stack-traces command line flag allows including
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// internal call sites in the stack trace for debugging purposes.
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if (!FLAG_builtins_in_stack_traces && fun->shared()->IsBuiltin()) {
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return fun->shared()->native();
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}
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return true;
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}
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static Handle<FixedArray> MaybeGrow(Isolate* isolate,
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Handle<FixedArray> elements,
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int cur_position, int new_size) {
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if (new_size > elements->length()) {
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int new_capacity = JSObject::NewElementsCapacity(elements->length());
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Handle<FixedArray> new_elements =
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isolate->factory()->NewFixedArrayWithHoles(new_capacity);
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for (int i = 0; i < cur_position; i++) {
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new_elements->set(i, elements->get(i));
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}
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elements = new_elements;
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}
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DCHECK(new_size <= elements->length());
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return elements;
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}
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Handle<Object> Isolate::CaptureSimpleStackTrace(Handle<JSReceiver> error_object,
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Handle<Object> caller) {
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// Get stack trace limit.
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Handle<JSObject> error = error_function();
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Handle<String> stackTraceLimit =
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factory()->InternalizeUtf8String("stackTraceLimit");
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DCHECK(!stackTraceLimit.is_null());
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Handle<Object> stack_trace_limit =
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JSReceiver::GetDataProperty(error, stackTraceLimit);
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if (!stack_trace_limit->IsNumber()) return factory()->undefined_value();
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int limit = FastD2IChecked(stack_trace_limit->Number());
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limit = Max(limit, 0); // Ensure that limit is not negative.
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int initial_size = Min(limit, 10);
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Handle<FixedArray> elements =
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factory()->NewFixedArrayWithHoles(initial_size * 4 + 1);
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// If the caller parameter is a function we skip frames until we're
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// under it before starting to collect.
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bool seen_caller = !caller->IsJSFunction();
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// First element is reserved to store the number of sloppy frames.
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int cursor = 1;
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int frames_seen = 0;
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int sloppy_frames = 0;
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bool encountered_strict_function = false;
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for (StackFrameIterator iter(this); !iter.done() && frames_seen < limit;
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iter.Advance()) {
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StackFrame* frame = iter.frame();
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switch (frame->type()) {
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case StackFrame::JAVA_SCRIPT:
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case StackFrame::OPTIMIZED:
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case StackFrame::INTERPRETED: {
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JavaScriptFrame* js_frame = JavaScriptFrame::cast(frame);
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// Set initial size to the maximum inlining level + 1 for the outermost
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// function.
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List<FrameSummary> frames(FLAG_max_inlining_levels + 1);
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js_frame->Summarize(&frames);
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for (int i = frames.length() - 1; i >= 0; i--) {
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Handle<JSFunction> fun = frames[i].function();
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Handle<Object> recv = frames[i].receiver();
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// Filter out internal frames that we do not want to show.
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if (!IsVisibleInStackTrace(*fun, *caller, *recv, &seen_caller)) {
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continue;
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}
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// Filter out frames from other security contexts.
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if (!this->context()->HasSameSecurityTokenAs(fun->context())) {
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continue;
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}
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elements = MaybeGrow(this, elements, cursor, cursor + 4);
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Handle<AbstractCode> abstract_code = frames[i].abstract_code();
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Handle<Smi> offset(Smi::FromInt(frames[i].code_offset()), this);
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// The stack trace API should not expose receivers and function
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// objects on frames deeper than the top-most one with a strict mode
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// function. The number of sloppy frames is stored as first element in
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// the result array.
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if (!encountered_strict_function) {
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if (is_strict(fun->shared()->language_mode())) {
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encountered_strict_function = true;
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} else {
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sloppy_frames++;
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}
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}
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elements->set(cursor++, *recv);
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elements->set(cursor++, *fun);
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elements->set(cursor++, *abstract_code);
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elements->set(cursor++, *offset);
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frames_seen++;
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}
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} break;
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case StackFrame::WASM: {
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WasmFrame* wasm_frame = WasmFrame::cast(frame);
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Code* code = wasm_frame->unchecked_code();
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Handle<AbstractCode> abstract_code =
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Handle<AbstractCode>(AbstractCode::cast(code));
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Handle<JSFunction> fun = factory()->NewFunction(
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factory()->NewStringFromAsciiChecked("<WASM>"));
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elements = MaybeGrow(this, elements, cursor, cursor + 4);
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// TODO(jfb) Pass module object.
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elements->set(cursor++, *factory()->undefined_value());
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elements->set(cursor++, *fun);
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elements->set(cursor++, *abstract_code);
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elements->set(cursor++, Internals::IntToSmi(0));
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frames_seen++;
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} break;
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default:
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break;
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}
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}
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elements->set(0, Smi::FromInt(sloppy_frames));
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elements->Shrink(cursor);
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Handle<JSArray> result = factory()->NewJSArrayWithElements(elements);
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result->set_length(Smi::FromInt(cursor));
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// TODO(yangguo): Queue this structured stack trace for preprocessing on GC.
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return result;
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}
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MaybeHandle<JSReceiver> Isolate::CaptureAndSetDetailedStackTrace(
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Handle<JSReceiver> error_object) {
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if (capture_stack_trace_for_uncaught_exceptions_) {
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// Capture stack trace for a detailed exception message.
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Handle<Name> key = factory()->detailed_stack_trace_symbol();
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Handle<JSArray> stack_trace = CaptureCurrentStackTrace(
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stack_trace_for_uncaught_exceptions_frame_limit_,
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stack_trace_for_uncaught_exceptions_options_);
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RETURN_ON_EXCEPTION(
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this, JSReceiver::SetProperty(error_object, key, stack_trace, STRICT),
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JSReceiver);
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}
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return error_object;
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}
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MaybeHandle<JSReceiver> Isolate::CaptureAndSetSimpleStackTrace(
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Handle<JSReceiver> error_object, Handle<Object> caller) {
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// Capture stack trace for simple stack trace string formatting.
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Handle<Name> key = factory()->stack_trace_symbol();
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Handle<Object> stack_trace = CaptureSimpleStackTrace(error_object, caller);
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RETURN_ON_EXCEPTION(
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this, JSReceiver::SetProperty(error_object, key, stack_trace, STRICT),
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JSReceiver);
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|
return error_object;
|
|
}
|
|
|
|
|
|
Handle<JSArray> 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->IsJSArray()) return Handle<JSArray>::cast(stack_trace);
|
|
|
|
if (!capture_stack_trace_for_uncaught_exceptions_) return Handle<JSArray>();
|
|
|
|
// Try to get details from simple stack trace.
|
|
Handle<JSArray> detailed_stack_trace =
|
|
GetDetailedFromSimpleStackTrace(error_object);
|
|
if (!detailed_stack_trace.is_null()) {
|
|
// Save the detailed stack since the simple one might be withdrawn later.
|
|
JSObject::SetProperty(error_object, key_detailed, detailed_stack_trace,
|
|
STRICT).Assert();
|
|
}
|
|
return detailed_stack_trace;
|
|
}
|
|
|
|
|
|
class CaptureStackTraceHelper {
|
|
public:
|
|
CaptureStackTraceHelper(Isolate* isolate,
|
|
StackTrace::StackTraceOptions options)
|
|
: isolate_(isolate) {
|
|
if (options & StackTrace::kColumnOffset) {
|
|
column_key_ =
|
|
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("column"));
|
|
}
|
|
if (options & StackTrace::kLineNumber) {
|
|
line_key_ =
|
|
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("lineNumber"));
|
|
}
|
|
if (options & StackTrace::kScriptId) {
|
|
script_id_key_ =
|
|
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("scriptId"));
|
|
}
|
|
if (options & StackTrace::kScriptName) {
|
|
script_name_key_ =
|
|
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("scriptName"));
|
|
}
|
|
if (options & StackTrace::kScriptNameOrSourceURL) {
|
|
script_name_or_source_url_key_ = factory()->InternalizeOneByteString(
|
|
STATIC_CHAR_VECTOR("scriptNameOrSourceURL"));
|
|
}
|
|
if (options & StackTrace::kFunctionName) {
|
|
function_key_ = factory()->InternalizeOneByteString(
|
|
STATIC_CHAR_VECTOR("functionName"));
|
|
}
|
|
if (options & StackTrace::kIsEval) {
|
|
eval_key_ =
|
|
factory()->InternalizeOneByteString(STATIC_CHAR_VECTOR("isEval"));
|
|
}
|
|
if (options & StackTrace::kIsConstructor) {
|
|
constructor_key_ = factory()->InternalizeOneByteString(
|
|
STATIC_CHAR_VECTOR("isConstructor"));
|
|
}
|
|
}
|
|
|
|
Handle<JSObject> NewStackFrameObject(Handle<JSFunction> fun, int position,
|
|
bool is_constructor) {
|
|
Handle<JSObject> stack_frame =
|
|
factory()->NewJSObject(isolate_->object_function());
|
|
|
|
Handle<Script> script(Script::cast(fun->shared()->script()));
|
|
|
|
if (!line_key_.is_null()) {
|
|
int script_line_offset = script->line_offset();
|
|
int line_number = Script::GetLineNumber(script, position);
|
|
// line_number is already shifted by the script_line_offset.
|
|
int relative_line_number = line_number - script_line_offset;
|
|
if (!column_key_.is_null() && relative_line_number >= 0) {
|
|
Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends()));
|
|
int start = (relative_line_number == 0) ? 0 :
|
|
Smi::cast(line_ends->get(relative_line_number - 1))->value() + 1;
|
|
int column_offset = position - start;
|
|
if (relative_line_number == 0) {
|
|
// For the case where the code is on the same line as the script
|
|
// tag.
|
|
column_offset += script->column_offset();
|
|
}
|
|
JSObject::AddProperty(stack_frame, column_key_,
|
|
handle(Smi::FromInt(column_offset + 1), isolate_),
|
|
NONE);
|
|
}
|
|
JSObject::AddProperty(stack_frame, line_key_,
|
|
handle(Smi::FromInt(line_number + 1), isolate_),
|
|
NONE);
|
|
}
|
|
|
|
if (!script_id_key_.is_null()) {
|
|
JSObject::AddProperty(stack_frame, script_id_key_,
|
|
handle(Smi::FromInt(script->id()), isolate_), NONE);
|
|
}
|
|
|
|
if (!script_name_key_.is_null()) {
|
|
JSObject::AddProperty(stack_frame, script_name_key_,
|
|
handle(script->name(), isolate_), NONE);
|
|
}
|
|
|
|
if (!script_name_or_source_url_key_.is_null()) {
|
|
Handle<Object> result = Script::GetNameOrSourceURL(script);
|
|
JSObject::AddProperty(stack_frame, script_name_or_source_url_key_, result,
|
|
NONE);
|
|
}
|
|
|
|
if (!function_key_.is_null()) {
|
|
Handle<Object> fun_name = JSFunction::GetDebugName(fun);
|
|
JSObject::AddProperty(stack_frame, function_key_, fun_name, NONE);
|
|
}
|
|
|
|
if (!eval_key_.is_null()) {
|
|
Handle<Object> is_eval = factory()->ToBoolean(
|
|
script->compilation_type() == Script::COMPILATION_TYPE_EVAL);
|
|
JSObject::AddProperty(stack_frame, eval_key_, is_eval, NONE);
|
|
}
|
|
|
|
if (!constructor_key_.is_null()) {
|
|
Handle<Object> is_constructor_obj = factory()->ToBoolean(is_constructor);
|
|
JSObject::AddProperty(stack_frame, constructor_key_, is_constructor_obj,
|
|
NONE);
|
|
}
|
|
|
|
return stack_frame;
|
|
}
|
|
|
|
private:
|
|
inline Factory* factory() { return isolate_->factory(); }
|
|
|
|
Isolate* isolate_;
|
|
Handle<String> column_key_;
|
|
Handle<String> line_key_;
|
|
Handle<String> script_id_key_;
|
|
Handle<String> script_name_key_;
|
|
Handle<String> script_name_or_source_url_key_;
|
|
Handle<String> function_key_;
|
|
Handle<String> eval_key_;
|
|
Handle<String> constructor_key_;
|
|
};
|
|
|
|
|
|
int PositionFromStackTrace(Handle<FixedArray> elements, int index) {
|
|
DisallowHeapAllocation no_gc;
|
|
Object* maybe_code = elements->get(index + 2);
|
|
if (maybe_code->IsSmi()) {
|
|
return Smi::cast(maybe_code)->value();
|
|
} else {
|
|
AbstractCode* abstract_code = AbstractCode::cast(maybe_code);
|
|
int code_offset = Smi::cast(elements->get(index + 3))->value();
|
|
return abstract_code->SourcePosition(code_offset);
|
|
}
|
|
}
|
|
|
|
|
|
Handle<JSArray> Isolate::GetDetailedFromSimpleStackTrace(
|
|
Handle<JSObject> error_object) {
|
|
Handle<Name> key = factory()->stack_trace_symbol();
|
|
Handle<Object> property = JSReceiver::GetDataProperty(error_object, key);
|
|
if (!property->IsJSArray()) return Handle<JSArray>();
|
|
Handle<JSArray> simple_stack_trace = Handle<JSArray>::cast(property);
|
|
|
|
CaptureStackTraceHelper helper(this,
|
|
stack_trace_for_uncaught_exceptions_options_);
|
|
|
|
int frames_seen = 0;
|
|
Handle<FixedArray> elements(FixedArray::cast(simple_stack_trace->elements()));
|
|
int elements_limit = Smi::cast(simple_stack_trace->length())->value();
|
|
|
|
int frame_limit = stack_trace_for_uncaught_exceptions_frame_limit_;
|
|
if (frame_limit < 0) frame_limit = (elements_limit - 1) / 4;
|
|
|
|
Handle<JSArray> stack_trace = factory()->NewJSArray(frame_limit);
|
|
for (int i = 1; i < elements_limit && frames_seen < frame_limit; i += 4) {
|
|
Handle<Object> recv = handle(elements->get(i), this);
|
|
Handle<JSFunction> fun =
|
|
handle(JSFunction::cast(elements->get(i + 1)), this);
|
|
bool is_constructor =
|
|
recv->IsJSObject() &&
|
|
Handle<JSObject>::cast(recv)->map()->GetConstructor() == *fun;
|
|
int position = PositionFromStackTrace(elements, i);
|
|
|
|
Handle<JSObject> stack_frame =
|
|
helper.NewStackFrameObject(fun, position, is_constructor);
|
|
|
|
FixedArray::cast(stack_trace->elements())->set(frames_seen, *stack_frame);
|
|
frames_seen++;
|
|
}
|
|
|
|
stack_trace->set_length(Smi::FromInt(frames_seen));
|
|
return stack_trace;
|
|
}
|
|
|
|
|
|
Handle<JSArray> Isolate::CaptureCurrentStackTrace(
|
|
int frame_limit, StackTrace::StackTraceOptions options) {
|
|
CaptureStackTraceHelper helper(this, options);
|
|
|
|
// Ensure no negative values.
|
|
int limit = Max(frame_limit, 0);
|
|
Handle<JSArray> stack_trace = factory()->NewJSArray(frame_limit);
|
|
|
|
StackTraceFrameIterator it(this);
|
|
int frames_seen = 0;
|
|
while (!it.done() && (frames_seen < limit)) {
|
|
JavaScriptFrame* frame = it.frame();
|
|
// Set initial size to the maximum inlining level + 1 for the outermost
|
|
// function.
|
|
List<FrameSummary> frames(FLAG_max_inlining_levels + 1);
|
|
frame->Summarize(&frames);
|
|
for (int i = frames.length() - 1; i >= 0 && frames_seen < limit; i--) {
|
|
Handle<JSFunction> fun = frames[i].function();
|
|
// Filter frames from other security contexts.
|
|
if (!(options & StackTrace::kExposeFramesAcrossSecurityOrigins) &&
|
|
!this->context()->HasSameSecurityTokenAs(fun->context())) continue;
|
|
int position =
|
|
frames[i].abstract_code()->SourcePosition(frames[i].code_offset());
|
|
Handle<JSObject> stack_frame =
|
|
helper.NewStackFrameObject(fun, position, frames[i].is_constructor());
|
|
|
|
FixedArray::cast(stack_trace->elements())->set(frames_seen, *stack_frame);
|
|
frames_seen++;
|
|
}
|
|
it.Advance();
|
|
}
|
|
|
|
stack_trace->set_length(Smi::FromInt(frames_seen));
|
|
return stack_trace;
|
|
}
|
|
|
|
|
|
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_ = NULL;
|
|
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;
|
|
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;
|
|
}
|
|
|
|
|
|
static inline AccessCheckInfo* GetAccessCheckInfo(Isolate* isolate,
|
|
Handle<JSObject> receiver) {
|
|
Object* maybe_constructor = receiver->map()->GetConstructor();
|
|
if (!maybe_constructor->IsJSFunction()) return NULL;
|
|
JSFunction* constructor = JSFunction::cast(maybe_constructor);
|
|
if (!constructor->shared()->IsApiFunction()) return NULL;
|
|
|
|
Object* data_obj =
|
|
constructor->shared()->get_api_func_data()->access_check_info();
|
|
if (data_obj == isolate->heap()->undefined_value()) return NULL;
|
|
|
|
return AccessCheckInfo::cast(data_obj);
|
|
}
|
|
|
|
|
|
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 = GetAccessCheckInfo(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;
|
|
v8::NamedSecurityCallback named_callback = nullptr;
|
|
{ DisallowHeapAllocation no_gc;
|
|
AccessCheckInfo* access_check_info = GetAccessCheckInfo(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);
|
|
if (!callback) {
|
|
fun_obj = access_check_info->named_callback();
|
|
named_callback = v8::ToCData<v8::NamedSecurityCallback>(fun_obj);
|
|
if (!named_callback) return false;
|
|
}
|
|
}
|
|
|
|
LOG(this, ApiSecurityCheck());
|
|
|
|
{
|
|
// Leaving JavaScript.
|
|
VMState<EXTERNAL> state(this);
|
|
if (callback) {
|
|
return callback(v8::Utils::ToLocal(accessing_context),
|
|
v8::Utils::ToLocal(receiver), v8::Utils::ToLocal(data));
|
|
}
|
|
Handle<Object> key = factory()->undefined_value();
|
|
return named_callback(v8::Utils::ToLocal(receiver), v8::Utils::ToLocal(key),
|
|
v8::ACCESS_HAS, v8::Utils::ToLocal(data));
|
|
}
|
|
}
|
|
|
|
|
|
const char* const Isolate::kStackOverflowMessage =
|
|
"Uncaught RangeError: Maximum call stack size exceeded";
|
|
|
|
|
|
Object* Isolate::StackOverflow() {
|
|
HandleScope scope(this);
|
|
// At this point we cannot create an Error object using its javascript
|
|
// constructor. Instead, we copy the pre-constructed boilerplate and
|
|
// attach the stack trace as a hidden property.
|
|
Handle<Object> exception;
|
|
if (bootstrapper()->IsActive()) {
|
|
// There is no boilerplate to use during bootstrapping.
|
|
exception = factory()->NewStringFromAsciiChecked(
|
|
MessageTemplate::TemplateString(MessageTemplate::kStackOverflow));
|
|
} else {
|
|
Handle<JSObject> boilerplate = stack_overflow_boilerplate();
|
|
Handle<JSObject> copy = factory()->CopyJSObject(boilerplate);
|
|
CaptureAndSetSimpleStackTrace(copy, factory()->undefined_value());
|
|
exception = copy;
|
|
}
|
|
Throw(*exception, nullptr);
|
|
|
|
#ifdef VERIFY_HEAP
|
|
if (FLAG_verify_heap && FLAG_stress_compaction) {
|
|
heap()->CollectAllGarbage(Heap::kNoGCFlags, "trigger compaction");
|
|
}
|
|
#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() {
|
|
// 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 == NULL || 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 occured
|
|
// 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
|
|
}
|
|
|
|
|
|
Object* Isolate::Throw(Object* exception, MessageLocation* location) {
|
|
DCHECK(!has_pending_exception());
|
|
|
|
HandleScope scope(this);
|
|
Handle<Object> exception_handle(exception, this);
|
|
|
|
// 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 == NULL && 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 &&
|
|
PredictExceptionCatcher() != CAUGHT_BY_JAVASCRIPT &&
|
|
(!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();
|
|
|
|
Code* code = nullptr;
|
|
Context* context = nullptr;
|
|
intptr_t offset = 0;
|
|
Address handler_sp = nullptr;
|
|
Address handler_fp = nullptr;
|
|
|
|
// Special handling of termination exceptions, uncatchable by JavaScript 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.done(); iter.Advance()) {
|
|
StackFrame* frame = iter.frame();
|
|
|
|
// For JSEntryStub frames we always have a handler.
|
|
if (frame->is_entry() || frame->is_entry_construct()) {
|
|
StackHandler* handler = frame->top_handler();
|
|
|
|
// Restore the next handler.
|
|
thread_local_top()->handler_ = handler->next()->address();
|
|
|
|
// Gather information from the handler.
|
|
code = frame->LookupCode();
|
|
handler_sp = handler->address() + StackHandlerConstants::kSize;
|
|
offset = Smi::cast(code->handler_table()->get(0))->value();
|
|
break;
|
|
}
|
|
|
|
// For optimized frames we perform a lookup in the handler table.
|
|
if (frame->is_optimized() && catchable_by_js) {
|
|
OptimizedFrame* js_frame = static_cast<OptimizedFrame*>(frame);
|
|
int stack_slots = 0; // Will contain stack slot count of frame.
|
|
offset = js_frame->LookupExceptionHandlerInTable(&stack_slots, nullptr);
|
|
if (offset >= 0) {
|
|
// 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 = frame->LookupCode();
|
|
if (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);
|
|
}
|
|
handler_sp = return_sp;
|
|
handler_fp = frame->fp();
|
|
break;
|
|
}
|
|
}
|
|
|
|
// For interpreted frame we perform a range lookup in the handler table.
|
|
if (frame->is_interpreted() && catchable_by_js) {
|
|
InterpretedFrame* js_frame = static_cast<InterpretedFrame*>(frame);
|
|
int context_reg = 0; // Will contain register index holding context.
|
|
offset = js_frame->LookupExceptionHandlerInTable(&context_reg, nullptr);
|
|
if (offset >= 0) {
|
|
// 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::cast(js_frame->GetInterpreterRegister(context_reg));
|
|
js_frame->PatchBytecodeOffset(static_cast<int>(offset));
|
|
offset = 0;
|
|
|
|
// Gather information from the frame.
|
|
code = *builtins()->InterpreterEnterBytecodeDispatch();
|
|
handler_sp = frame->sp();
|
|
handler_fp = frame->fp();
|
|
break;
|
|
}
|
|
}
|
|
|
|
// For JavaScript frames we perform a range lookup in the handler table.
|
|
if (frame->is_java_script() && catchable_by_js) {
|
|
JavaScriptFrame* js_frame = static_cast<JavaScriptFrame*>(frame);
|
|
int stack_depth = 0; // Will contain operand stack depth of handler.
|
|
offset = js_frame->LookupExceptionHandlerInTable(&stack_depth, nullptr);
|
|
if (offset >= 0) {
|
|
// Compute the stack pointer from the frame pointer. This ensures that
|
|
// operand stack slots are dropped for nested statements. Also restore
|
|
// correct context for the handler which is pushed within the try-block.
|
|
Address return_sp = frame->fp() -
|
|
StandardFrameConstants::kFixedFrameSizeFromFp -
|
|
stack_depth * kPointerSize;
|
|
STATIC_ASSERT(TryBlockConstant::kElementCount == 1);
|
|
context = Context::cast(Memory::Object_at(return_sp - kPointerSize));
|
|
|
|
// Gather information from the frame.
|
|
code = frame->LookupCode();
|
|
handler_sp = return_sp;
|
|
handler_fp = frame->fp();
|
|
break;
|
|
}
|
|
}
|
|
|
|
RemoveMaterializedObjectsOnUnwind(frame);
|
|
}
|
|
|
|
// Handler must exist.
|
|
CHECK(code != nullptr);
|
|
|
|
// Store information to be consumed by the CEntryStub.
|
|
thread_local_top()->pending_handler_context_ = context;
|
|
thread_local_top()->pending_handler_code_ = code;
|
|
thread_local_top()->pending_handler_offset_ = offset;
|
|
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;
|
|
}
|
|
|
|
|
|
Isolate::CatchType Isolate::PredictExceptionCatcher() {
|
|
Address external_handler = thread_local_top()->try_catch_handler_address();
|
|
Address entry_handler = Isolate::handler(thread_local_top());
|
|
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();
|
|
|
|
// For JSEntryStub frames we update the JS_ENTRY handler.
|
|
if (frame->is_entry() || frame->is_entry_construct()) {
|
|
entry_handler = frame->top_handler()->next()->address();
|
|
}
|
|
|
|
// For JavaScript frames we perform a lookup in the handler table.
|
|
if (frame->is_java_script()) {
|
|
JavaScriptFrame* js_frame = static_cast<JavaScriptFrame*>(frame);
|
|
HandlerTable::CatchPrediction prediction;
|
|
if (js_frame->LookupExceptionHandlerInTable(nullptr, &prediction) > 0) {
|
|
// We are conservative with our prediction: try-finally is considered
|
|
// to always rethrow, to meet the expectation of the debugger.
|
|
if (prediction == HandlerTable::CAUGHT) return CAUGHT_BY_JAVASCRIPT;
|
|
}
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Handler not found.
|
|
return NOT_CAUGHT;
|
|
}
|
|
|
|
|
|
void Isolate::RemoveMaterializedObjectsOnUnwind(StackFrame* frame) {
|
|
if (frame->is_optimized()) {
|
|
bool removed = materialized_object_store_->Remove(frame->fp());
|
|
USE(removed);
|
|
// If there were any materialized objects, the code should be
|
|
// marked for deopt.
|
|
DCHECK(!removed || frame->LookupCode()->marked_for_deoptimization());
|
|
}
|
|
}
|
|
|
|
|
|
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());
|
|
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();
|
|
}
|
|
}
|
|
|
|
|
|
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) {
|
|
StackTraceFrameIterator it(this);
|
|
while (!it.done()) {
|
|
HandleScope scope(this);
|
|
// Find code position if recorded in relocation info.
|
|
JavaScriptFrame* frame = it.frame();
|
|
int pos = RelocInfo::kNoPosition;
|
|
if (frame->is_interpreted()) {
|
|
InterpretedFrame* iframe = reinterpret_cast<InterpretedFrame*>(frame);
|
|
BytecodeArray* bytecode_array = iframe->GetBytecodeArray();
|
|
pos = bytecode_array->SourcePosition(iframe->GetBytecodeOffset());
|
|
} else if (!frame->is_optimized()) {
|
|
Code* code = frame->LookupCode();
|
|
int offset = static_cast<int>(frame->pc() - code->instruction_start());
|
|
pos = frame->LookupCode()->SourcePosition(offset);
|
|
}
|
|
Handle<Object> pos_obj(Smi::FromInt(pos), this);
|
|
// Fetch function and receiver.
|
|
Handle<JSFunction> fun(frame->function());
|
|
Handle<Object> recv(frame->receiver(), this);
|
|
// Advance to the next JavaScript frame and determine if the
|
|
// current frame is the top-level frame.
|
|
it.Advance();
|
|
Handle<Object> is_top_level = factory()->ToBoolean(it.done());
|
|
// Generate and print stack trace line.
|
|
Handle<String> line =
|
|
Execution::GetStackTraceLine(recv, fun, pos_obj, is_top_level);
|
|
if (line->length() > 0) {
|
|
line->PrintOn(out);
|
|
PrintF(out, "\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
bool Isolate::ComputeLocation(MessageLocation* target) {
|
|
StackTraceFrameIterator it(this);
|
|
if (!it.done()) {
|
|
JavaScriptFrame* frame = it.frame();
|
|
JSFunction* fun = frame->function();
|
|
Object* script = fun->shared()->script();
|
|
if (script->IsScript() &&
|
|
!(Script::cast(script)->source()->IsUndefined())) {
|
|
Handle<Script> casted_script(Script::cast(script));
|
|
// 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.
|
|
List<FrameSummary> frames(FLAG_max_inlining_levels + 1);
|
|
it.frame()->Summarize(&frames);
|
|
FrameSummary& summary = frames.last();
|
|
int pos = summary.abstract_code()->SourcePosition(summary.code_offset());
|
|
*target = MessageLocation(casted_script, pos, pos + 1, handle(fun));
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
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<FixedArray> elements(FixedArray::cast(simple_stack_trace->elements()));
|
|
int elements_limit = Smi::cast(simple_stack_trace->length())->value();
|
|
|
|
for (int i = 1; i < elements_limit; i += 4) {
|
|
Handle<JSFunction> fun =
|
|
handle(JSFunction::cast(elements->get(i + 1)), this);
|
|
if (!fun->shared()->IsSubjectToDebugging()) continue;
|
|
|
|
Object* script = fun->shared()->script();
|
|
if (script->IsScript() &&
|
|
!(Script::cast(script)->source()->IsUndefined())) {
|
|
int pos = PositionFromStackTrace(elements, i);
|
|
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<JSArray> stack_trace_object;
|
|
if (capture_stack_trace_for_uncaught_exceptions_) {
|
|
if (Object::IsErrorObject(this, exception)) {
|
|
// 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 == NULL &&
|
|
(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::ReportPendingMessages() {
|
|
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;
|
|
|
|
// 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 (IsExternalHandlerOnTop(exception)) {
|
|
// 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() && should_report_exception) {
|
|
HandleScope scope(this);
|
|
Handle<JSMessageObject> message(JSMessageObject::cast(message_obj));
|
|
Handle<JSValue> script_wrapper(JSValue::cast(message->script()));
|
|
Handle<Script> script(Script::cast(script_wrapper->value()));
|
|
int start_pos = message->start_position();
|
|
int end_pos = message->end_position();
|
|
MessageLocation location(script, start_pos, end_pos);
|
|
MessageHandler::ReportMessage(this, &location, message);
|
|
}
|
|
}
|
|
|
|
|
|
MessageLocation Isolate::GetMessageLocation() {
|
|
DCHECK(has_pending_exception());
|
|
|
|
if (thread_local_top_.pending_exception_ != heap()->termination_exception() &&
|
|
!thread_local_top_.pending_message_obj_->IsTheHole()) {
|
|
Handle<JSMessageObject> message_obj(
|
|
JSMessageObject::cast(thread_local_top_.pending_message_obj_));
|
|
Handle<JSValue> script_wrapper(JSValue::cast(message_obj->script()));
|
|
Handle<Script> script(Script::cast(script_wrapper->value()));
|
|
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(thread_local_top()->try_catch_handler_address() != NULL);
|
|
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,
|
|
Handle<JSFunction> function) {
|
|
ThreadLocalTop* tltop = thread_local_top();
|
|
PromiseOnStack* prev = tltop->promise_on_stack_;
|
|
Handle<JSObject> global_promise =
|
|
Handle<JSObject>::cast(global_handles()->Create(*promise));
|
|
Handle<JSFunction> global_function =
|
|
Handle<JSFunction>::cast(global_handles()->Create(*function));
|
|
tltop->promise_on_stack_ =
|
|
new PromiseOnStack(global_function, global_promise, prev);
|
|
}
|
|
|
|
|
|
void Isolate::PopPromise() {
|
|
ThreadLocalTop* tltop = thread_local_top();
|
|
if (tltop->promise_on_stack_ == NULL) return;
|
|
PromiseOnStack* prev = tltop->promise_on_stack_->prev();
|
|
Handle<Object> global_function = tltop->promise_on_stack_->function();
|
|
Handle<Object> global_promise = tltop->promise_on_stack_->promise();
|
|
delete tltop->promise_on_stack_;
|
|
tltop->promise_on_stack_ = prev;
|
|
global_handles()->Destroy(global_function.location());
|
|
global_handles()->Destroy(global_promise.location());
|
|
}
|
|
|
|
|
|
Handle<Object> Isolate::GetPromiseOnStackOnThrow() {
|
|
Handle<Object> undefined = factory()->undefined_value();
|
|
ThreadLocalTop* tltop = thread_local_top();
|
|
if (tltop->promise_on_stack_ == NULL) return undefined;
|
|
Handle<JSFunction> promise_function = tltop->promise_on_stack_->function();
|
|
// Find the top-most try-catch or try-finally handler.
|
|
if (PredictExceptionCatcher() != CAUGHT_BY_JAVASCRIPT) return undefined;
|
|
for (JavaScriptFrameIterator it(this); !it.done(); it.Advance()) {
|
|
JavaScriptFrame* frame = it.frame();
|
|
if (frame->LookupExceptionHandlerInTable(nullptr, nullptr) > 0) {
|
|
// Throwing inside a Promise only leads to a reject if not caught by an
|
|
// inner try-catch or try-finally.
|
|
if (frame->function() == *promise_function) {
|
|
return tltop->promise_on_stack_->promise();
|
|
}
|
|
return undefined;
|
|
}
|
|
}
|
|
return undefined;
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
Handle<Context> Isolate::native_context() {
|
|
return handle(context()->native_context());
|
|
}
|
|
|
|
|
|
Handle<Context> Isolate::GetCallingNativeContext() {
|
|
JavaScriptFrameIterator it(this);
|
|
if (debug_->in_debug_scope()) {
|
|
while (!it.done()) {
|
|
JavaScriptFrame* frame = it.frame();
|
|
Context* context = Context::cast(frame->context());
|
|
if (context->native_context() == *debug_->debug_context()) {
|
|
it.Advance();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (it.done()) return Handle<Context>::null();
|
|
JavaScriptFrame* frame = it.frame();
|
|
Context* context = Context::cast(frame->context());
|
|
return Handle<Context>(context->native_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() == NULL || context()->IsContext());
|
|
return from + sizeof(ThreadLocalTop);
|
|
}
|
|
|
|
|
|
Isolate::ThreadDataTable::ThreadDataTable()
|
|
: list_(NULL) {
|
|
}
|
|
|
|
|
|
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_);
|
|
}
|
|
|
|
|
|
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 != NULL; data = data->next_) {
|
|
if (data->Matches(isolate, thread_id)) return data;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
void Isolate::ThreadDataTable::Insert(Isolate::PerIsolateThreadData* data) {
|
|
if (list_ != NULL) list_->prev_ = data;
|
|
data->next_ = list_;
|
|
list_ = data;
|
|
}
|
|
|
|
|
|
void Isolate::ThreadDataTable::Remove(PerIsolateThreadData* data) {
|
|
if (list_ == data) list_ = data->next_;
|
|
if (data->next_ != NULL) data->next_->prev_ = data->prev_;
|
|
if (data->prev_ != NULL) data->prev_->next_ = data->next_;
|
|
delete data;
|
|
}
|
|
|
|
|
|
void Isolate::ThreadDataTable::RemoveAllThreads(Isolate* isolate) {
|
|
PerIsolateThreadData* data = list_;
|
|
while (data != NULL) {
|
|
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
|
|
|
|
Isolate::Isolate(bool enable_serializer)
|
|
: embedder_data_(),
|
|
entry_stack_(NULL),
|
|
stack_trace_nesting_level_(0),
|
|
incomplete_message_(NULL),
|
|
bootstrapper_(NULL),
|
|
runtime_profiler_(NULL),
|
|
compilation_cache_(NULL),
|
|
counters_(NULL),
|
|
code_range_(NULL),
|
|
logger_(NULL),
|
|
stats_table_(NULL),
|
|
stub_cache_(NULL),
|
|
code_aging_helper_(NULL),
|
|
deoptimizer_data_(NULL),
|
|
deoptimizer_lazy_throw_(false),
|
|
materialized_object_store_(NULL),
|
|
capture_stack_trace_for_uncaught_exceptions_(false),
|
|
stack_trace_for_uncaught_exceptions_frame_limit_(0),
|
|
stack_trace_for_uncaught_exceptions_options_(StackTrace::kOverview),
|
|
memory_allocator_(NULL),
|
|
keyed_lookup_cache_(NULL),
|
|
context_slot_cache_(NULL),
|
|
descriptor_lookup_cache_(NULL),
|
|
handle_scope_implementer_(NULL),
|
|
unicode_cache_(NULL),
|
|
runtime_zone_(&allocator_),
|
|
interface_descriptor_zone_(&allocator_),
|
|
inner_pointer_to_code_cache_(NULL),
|
|
global_handles_(NULL),
|
|
eternal_handles_(NULL),
|
|
thread_manager_(NULL),
|
|
has_installed_extensions_(false),
|
|
regexp_stack_(NULL),
|
|
date_cache_(NULL),
|
|
call_descriptor_data_(NULL),
|
|
// TODO(bmeurer) Initialized lazily because it depends on flags; can
|
|
// be fixed once the default isolate cleanup is done.
|
|
random_number_generator_(NULL),
|
|
serializer_enabled_(enable_serializer),
|
|
has_fatal_error_(false),
|
|
initialized_from_snapshot_(false),
|
|
is_tail_call_elimination_enabled_(true),
|
|
cpu_profiler_(NULL),
|
|
heap_profiler_(NULL),
|
|
function_entry_hook_(NULL),
|
|
deferred_handles_head_(NULL),
|
|
optimizing_compile_dispatcher_(NULL),
|
|
stress_deopt_count_(0),
|
|
virtual_handler_register_(NULL),
|
|
virtual_slot_register_(NULL),
|
|
next_optimization_id_(0),
|
|
js_calls_from_api_counter_(0),
|
|
#if TRACE_MAPS
|
|
next_unique_sfi_id_(0),
|
|
#endif
|
|
use_counter_callback_(NULL),
|
|
basic_block_profiler_(NULL),
|
|
cancelable_task_manager_(new CancelableTaskManager()),
|
|
abort_on_uncaught_exception_callback_(NULL) {
|
|
{
|
|
base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
|
|
CHECK(thread_data_table_);
|
|
}
|
|
id_ = base::NoBarrier_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
|
|
// heap_histograms_ initializes itself.
|
|
memset(&js_spill_information_, 0, sizeof(js_spill_information_));
|
|
#endif
|
|
|
|
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);
|
|
|
|
init_memcopy_functions(this);
|
|
}
|
|
|
|
|
|
void Isolate::TearDown() {
|
|
TRACE_ISOLATE(tear_down);
|
|
|
|
// 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(base::NoBarrier_Load(&isolate_key_created_) == 1);
|
|
Isolate* saved_isolate =
|
|
reinterpret_cast<Isolate*>(base::Thread::GetThreadLocal(isolate_key_));
|
|
SetIsolateThreadLocals(this, NULL);
|
|
|
|
Deinit();
|
|
|
|
{
|
|
base::LockGuard<base::Mutex> lock_guard(thread_data_table_mutex_.Pointer());
|
|
thread_data_table_->RemoveAllThreads(this);
|
|
}
|
|
|
|
delete this;
|
|
|
|
// Restore the previous current isolate.
|
|
SetIsolateThreadLocals(saved_isolate, saved_data);
|
|
}
|
|
|
|
|
|
void Isolate::GlobalTearDown() {
|
|
delete thread_data_table_;
|
|
thread_data_table_ = NULL;
|
|
}
|
|
|
|
|
|
void Isolate::ClearSerializerData() {
|
|
delete external_reference_table_;
|
|
external_reference_table_ = NULL;
|
|
delete external_reference_map_;
|
|
external_reference_map_ = NULL;
|
|
}
|
|
|
|
|
|
void Isolate::Deinit() {
|
|
TRACE_ISOLATE(deinit);
|
|
|
|
debug()->Unload();
|
|
|
|
FreeThreadResources();
|
|
|
|
if (concurrent_recompilation_enabled()) {
|
|
optimizing_compile_dispatcher_->Stop();
|
|
delete optimizing_compile_dispatcher_;
|
|
optimizing_compile_dispatcher_ = NULL;
|
|
}
|
|
|
|
if (heap_.mark_compact_collector()->sweeping_in_progress()) {
|
|
heap_.mark_compact_collector()->EnsureSweepingCompleted();
|
|
}
|
|
|
|
DumpAndResetCompilationStats();
|
|
|
|
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 = logger_->sampler();
|
|
if (sampler && sampler->IsActive()) sampler->Stop();
|
|
|
|
delete deoptimizer_data_;
|
|
deoptimizer_data_ = NULL;
|
|
builtins_.TearDown();
|
|
bootstrapper_->TearDown();
|
|
|
|
if (runtime_profiler_ != NULL) {
|
|
delete runtime_profiler_;
|
|
runtime_profiler_ = NULL;
|
|
}
|
|
|
|
delete basic_block_profiler_;
|
|
basic_block_profiler_ = NULL;
|
|
|
|
delete heap_profiler_;
|
|
heap_profiler_ = NULL;
|
|
|
|
heap_.TearDown();
|
|
logger_->TearDown();
|
|
|
|
delete interpreter_;
|
|
interpreter_ = NULL;
|
|
|
|
cancelable_task_manager()->CancelAndWait();
|
|
|
|
delete cpu_profiler_;
|
|
cpu_profiler_ = NULL;
|
|
|
|
delete root_index_map_;
|
|
root_index_map_ = NULL;
|
|
|
|
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);
|
|
|
|
// Has to be called while counters_ are still alive
|
|
runtime_zone_.DeleteKeptSegment();
|
|
|
|
// The entry stack must be empty when we get here.
|
|
DCHECK(entry_stack_ == NULL || entry_stack_->previous_item == NULL);
|
|
|
|
delete entry_stack_;
|
|
entry_stack_ = NULL;
|
|
|
|
delete unicode_cache_;
|
|
unicode_cache_ = NULL;
|
|
|
|
delete date_cache_;
|
|
date_cache_ = NULL;
|
|
|
|
delete[] call_descriptor_data_;
|
|
call_descriptor_data_ = NULL;
|
|
|
|
delete regexp_stack_;
|
|
regexp_stack_ = NULL;
|
|
|
|
delete descriptor_lookup_cache_;
|
|
descriptor_lookup_cache_ = NULL;
|
|
delete context_slot_cache_;
|
|
context_slot_cache_ = NULL;
|
|
delete keyed_lookup_cache_;
|
|
keyed_lookup_cache_ = NULL;
|
|
|
|
delete stub_cache_;
|
|
stub_cache_ = NULL;
|
|
delete code_aging_helper_;
|
|
code_aging_helper_ = NULL;
|
|
delete stats_table_;
|
|
stats_table_ = NULL;
|
|
|
|
delete materialized_object_store_;
|
|
materialized_object_store_ = NULL;
|
|
|
|
delete logger_;
|
|
logger_ = NULL;
|
|
|
|
delete counters_;
|
|
counters_ = NULL;
|
|
|
|
delete handle_scope_implementer_;
|
|
handle_scope_implementer_ = NULL;
|
|
|
|
delete code_tracer();
|
|
set_code_tracer(NULL);
|
|
|
|
delete compilation_cache_;
|
|
compilation_cache_ = NULL;
|
|
delete bootstrapper_;
|
|
bootstrapper_ = NULL;
|
|
delete inner_pointer_to_code_cache_;
|
|
inner_pointer_to_code_cache_ = NULL;
|
|
|
|
delete thread_manager_;
|
|
thread_manager_ = NULL;
|
|
|
|
delete memory_allocator_;
|
|
memory_allocator_ = NULL;
|
|
delete code_range_;
|
|
code_range_ = NULL;
|
|
delete global_handles_;
|
|
global_handles_ = NULL;
|
|
delete eternal_handles_;
|
|
eternal_handles_ = NULL;
|
|
|
|
delete string_stream_debug_object_cache_;
|
|
string_stream_debug_object_cache_ = NULL;
|
|
|
|
delete random_number_generator_;
|
|
random_number_generator_ = NULL;
|
|
|
|
delete debug_;
|
|
debug_ = NULL;
|
|
|
|
delete cancelable_task_manager_;
|
|
cancelable_task_manager_ = nullptr;
|
|
|
|
#if USE_SIMULATOR
|
|
Simulator::TearDown(simulator_i_cache_, simulator_redirection_);
|
|
simulator_i_cache_ = nullptr;
|
|
simulator_redirection_ = 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());
|
|
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()) return true;
|
|
|
|
handler->message_obj_ = thread_local_top_.pending_message_obj_;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
void Isolate::InitializeLoggingAndCounters() {
|
|
if (logger_ == NULL) {
|
|
logger_ = new Logger(this);
|
|
}
|
|
if (counters_ == NULL) {
|
|
counters_ = new Counters(this);
|
|
}
|
|
}
|
|
|
|
|
|
bool Isolate::Init(Deserializer* des) {
|
|
TRACE_ISOLATE(init);
|
|
|
|
stress_deopt_count_ = FLAG_deopt_every_n_times;
|
|
|
|
has_fatal_error_ = false;
|
|
|
|
if (function_entry_hook() != NULL) {
|
|
// When function entry hooking is in effect, we have to create the code
|
|
// stubs from scratch to get entry hooks, rather than loading the previously
|
|
// generated stubs from disk.
|
|
// If this assert fires, the initialization path has regressed.
|
|
DCHECK(des == NULL);
|
|
}
|
|
|
|
// The initialization process does not handle memory exhaustion.
|
|
AlwaysAllocateScope always_allocate(this);
|
|
|
|
memory_allocator_ = new MemoryAllocator(this);
|
|
code_range_ = new CodeRange(this);
|
|
|
|
// Safe after setting Heap::isolate_, and initializing StackGuard
|
|
heap_.SetStackLimits();
|
|
|
|
#define ASSIGN_ELEMENT(CamelName, hacker_name) \
|
|
isolate_addresses_[Isolate::k##CamelName##Address] = \
|
|
reinterpret_cast<Address>(hacker_name##_address());
|
|
FOR_EACH_ISOLATE_ADDRESS_NAME(ASSIGN_ELEMENT)
|
|
#undef ASSIGN_ELEMENT
|
|
|
|
compilation_cache_ = new CompilationCache(this);
|
|
keyed_lookup_cache_ = new KeyedLookupCache();
|
|
context_slot_cache_ = new ContextSlotCache();
|
|
descriptor_lookup_cache_ = new DescriptorLookupCache();
|
|
unicode_cache_ = new UnicodeCache();
|
|
inner_pointer_to_code_cache_ = new InnerPointerToCodeCache(this);
|
|
global_handles_ = new GlobalHandles(this);
|
|
eternal_handles_ = new EternalHandles();
|
|
bootstrapper_ = new Bootstrapper(this);
|
|
handle_scope_implementer_ = new HandleScopeImplementer(this);
|
|
stub_cache_ = new StubCache(this);
|
|
materialized_object_store_ = new MaterializedObjectStore(this);
|
|
regexp_stack_ = new RegExpStack();
|
|
regexp_stack_->isolate_ = this;
|
|
date_cache_ = new DateCache();
|
|
call_descriptor_data_ =
|
|
new CallInterfaceDescriptorData[CallDescriptors::NUMBER_OF_DESCRIPTORS];
|
|
cpu_profiler_ = new CpuProfiler(this);
|
|
heap_profiler_ = new HeapProfiler(heap());
|
|
interpreter_ = new interpreter::Interpreter(this);
|
|
|
|
// Enable logging before setting up the heap
|
|
logger_->SetUp(this);
|
|
|
|
// Initialize other runtime facilities
|
|
#if defined(USE_SIMULATOR)
|
|
#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_MIPS || \
|
|
V8_TARGET_ARCH_MIPS64 || V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_S390
|
|
Simulator::Initialize(this);
|
|
#endif
|
|
#endif
|
|
|
|
code_aging_helper_ = new CodeAgingHelper(this);
|
|
|
|
{ // NOLINT
|
|
// Ensure that the thread has a valid stack guard. The v8::Locker object
|
|
// will ensure this too, but we don't have to use lockers if we are only
|
|
// using one thread.
|
|
ExecutionAccess lock(this);
|
|
stack_guard_.InitThread(lock);
|
|
}
|
|
|
|
// SetUp the object heap.
|
|
DCHECK(!heap_.HasBeenSetUp());
|
|
if (!heap_.SetUp()) {
|
|
V8::FatalProcessOutOfMemory("heap setup");
|
|
return false;
|
|
}
|
|
|
|
deoptimizer_data_ = new DeoptimizerData(memory_allocator_);
|
|
|
|
const bool create_heap_objects = (des == NULL);
|
|
if (create_heap_objects && !heap_.CreateHeapObjects()) {
|
|
V8::FatalProcessOutOfMemory("heap object creation");
|
|
return false;
|
|
}
|
|
|
|
if (create_heap_objects) {
|
|
// Terminate the partial snapshot cache so we can iterate.
|
|
partial_snapshot_cache_.Add(heap_.undefined_value());
|
|
}
|
|
|
|
InitializeThreadLocal();
|
|
|
|
bootstrapper_->Initialize(create_heap_objects);
|
|
builtins_.SetUp(this, create_heap_objects);
|
|
|
|
if (FLAG_log_internal_timer_events) {
|
|
set_event_logger(Logger::DefaultEventLoggerSentinel);
|
|
}
|
|
|
|
if (FLAG_trace_hydrogen || FLAG_trace_hydrogen_stubs) {
|
|
PrintF("Concurrent recompilation has been disabled for tracing.\n");
|
|
} else if (OptimizingCompileDispatcher::Enabled()) {
|
|
optimizing_compile_dispatcher_ = new OptimizingCompileDispatcher(this);
|
|
}
|
|
|
|
// Initialize runtime profiler before deserialization, because collections may
|
|
// occur, clearing/updating ICs.
|
|
runtime_profiler_ = new RuntimeProfiler(this);
|
|
|
|
// If we are deserializing, read the state into the now-empty heap.
|
|
if (!create_heap_objects) {
|
|
des->Deserialize(this);
|
|
}
|
|
stub_cache_->Initialize();
|
|
|
|
if (FLAG_ignition) {
|
|
interpreter_->Initialize();
|
|
}
|
|
|
|
// Finish initialization of ThreadLocal after deserialization is done.
|
|
clear_pending_exception();
|
|
clear_pending_message();
|
|
clear_scheduled_exception();
|
|
|
|
// Deserializing may put strange things in the root array's copy of the
|
|
// stack guard.
|
|
heap_.SetStackLimits();
|
|
|
|
// Quiet the heap NaN if needed on target platform.
|
|
if (!create_heap_objects) Assembler::QuietNaN(heap_.nan_value());
|
|
|
|
if (FLAG_trace_turbo) {
|
|
// Create an empty file.
|
|
std::ofstream(GetTurboCfgFileName().c_str(), std::ios_base::trunc);
|
|
}
|
|
|
|
CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, embedder_data_)),
|
|
Internals::kIsolateEmbedderDataOffset);
|
|
CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, heap_.roots_)),
|
|
Internals::kIsolateRootsOffset);
|
|
CHECK_EQ(static_cast<int>(
|
|
OFFSET_OF(Isolate, heap_.amount_of_external_allocated_memory_)),
|
|
Internals::kAmountOfExternalAllocatedMemoryOffset);
|
|
CHECK_EQ(static_cast<int>(OFFSET_OF(
|
|
Isolate,
|
|
heap_.amount_of_external_allocated_memory_at_last_global_gc_)),
|
|
Internals::kAmountOfExternalAllocatedMemoryAtLastGlobalGCOffset);
|
|
|
|
time_millis_at_init_ = heap_.MonotonicallyIncreasingTimeInMs();
|
|
|
|
heap_.NotifyDeserializationComplete();
|
|
|
|
if (!create_heap_objects) {
|
|
// Now that the heap is consistent, it's OK to generate the code for the
|
|
// deopt entry table that might have been referred to by optimized code in
|
|
// the snapshot.
|
|
HandleScope scope(this);
|
|
Deoptimizer::EnsureCodeForDeoptimizationEntry(
|
|
this, Deoptimizer::LAZY,
|
|
ExternalReferenceTable::kDeoptTableSerializeEntryCount - 1);
|
|
}
|
|
|
|
if (!serializer_enabled()) {
|
|
// Ensure that all stubs which need to be generated ahead of time, but
|
|
// cannot be serialized into the snapshot have been generated.
|
|
HandleScope scope(this);
|
|
CodeStub::GenerateFPStubs(this);
|
|
StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(this);
|
|
StubFailureTrampolineStub::GenerateAheadOfTime(this);
|
|
}
|
|
|
|
initialized_from_snapshot_ = (des != NULL);
|
|
|
|
if (!FLAG_inline_new) heap_.DisableInlineAllocation();
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// Initialized lazily to allow early
|
|
// v8::V8::SetAddHistogramSampleFunction calls.
|
|
StatsTable* Isolate::stats_table() {
|
|
if (stats_table_ == NULL) {
|
|
stats_table_ = new StatsTable;
|
|
}
|
|
return stats_table_;
|
|
}
|
|
|
|
|
|
void Isolate::Enter() {
|
|
Isolate* current_isolate = NULL;
|
|
PerIsolateThreadData* current_data = CurrentPerIsolateThreadData();
|
|
if (current_data != NULL) {
|
|
current_isolate = current_data->isolate_;
|
|
DCHECK(current_isolate != NULL);
|
|
if (current_isolate == this) {
|
|
DCHECK(Current() == this);
|
|
DCHECK(entry_stack_ != NULL);
|
|
DCHECK(entry_stack_->previous_thread_data == NULL ||
|
|
entry_stack_->previous_thread_data->thread_id().Equals(
|
|
ThreadId::Current()));
|
|
// Same thread re-enters the isolate, no need to re-init anything.
|
|
entry_stack_->entry_count++;
|
|
return;
|
|
}
|
|
}
|
|
|
|
PerIsolateThreadData* data = FindOrAllocatePerThreadDataForThisThread();
|
|
DCHECK(data != NULL);
|
|
DCHECK(data->isolate_ == this);
|
|
|
|
EntryStackItem* item = new EntryStackItem(current_data,
|
|
current_isolate,
|
|
entry_stack_);
|
|
entry_stack_ = item;
|
|
|
|
SetIsolateThreadLocals(this, data);
|
|
|
|
// In case it's the first time some thread enters the isolate.
|
|
set_thread_id(data->thread_id());
|
|
}
|
|
|
|
|
|
void Isolate::Exit() {
|
|
DCHECK(entry_stack_ != NULL);
|
|
DCHECK(entry_stack_->previous_thread_data == NULL ||
|
|
entry_stack_->previous_thread_data->thread_id().Equals(
|
|
ThreadId::Current()));
|
|
|
|
if (--entry_stack_->entry_count > 0) return;
|
|
|
|
DCHECK(CurrentPerIsolateThreadData() != NULL);
|
|
DCHECK(CurrentPerIsolateThreadData()->isolate_ == this);
|
|
|
|
// Pop the stack.
|
|
EntryStackItem* item = entry_stack_;
|
|
entry_stack_ = item->previous_item;
|
|
|
|
PerIsolateThreadData* previous_thread_data = item->previous_thread_data;
|
|
Isolate* previous_isolate = item->previous_isolate;
|
|
|
|
delete item;
|
|
|
|
// Reinit the current thread for the isolate it was running before this one.
|
|
SetIsolateThreadLocals(previous_isolate, previous_thread_data);
|
|
}
|
|
|
|
|
|
void Isolate::LinkDeferredHandles(DeferredHandles* deferred) {
|
|
deferred->next_ = deferred_handles_head_;
|
|
if (deferred_handles_head_ != NULL) {
|
|
deferred_handles_head_->previous_ = deferred;
|
|
}
|
|
deferred_handles_head_ = deferred;
|
|
}
|
|
|
|
|
|
void Isolate::UnlinkDeferredHandles(DeferredHandles* deferred) {
|
|
#ifdef DEBUG
|
|
// In debug mode assert that the linked list is well-formed.
|
|
DeferredHandles* deferred_iterator = deferred;
|
|
while (deferred_iterator->previous_ != NULL) {
|
|
deferred_iterator = deferred_iterator->previous_;
|
|
}
|
|
DCHECK(deferred_handles_head_ == deferred_iterator);
|
|
#endif
|
|
if (deferred_handles_head_ == deferred) {
|
|
deferred_handles_head_ = deferred_handles_head_->next_;
|
|
}
|
|
if (deferred->next_ != NULL) {
|
|
deferred->next_->previous_ = deferred->previous_;
|
|
}
|
|
if (deferred->previous_ != NULL) {
|
|
deferred->previous_->next_ = deferred->next_;
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::DumpAndResetCompilationStats() {
|
|
if (turbo_statistics() != nullptr) {
|
|
OFStream os(stdout);
|
|
os << *turbo_statistics() << std::endl;
|
|
}
|
|
if (hstatistics() != nullptr) hstatistics()->Print();
|
|
delete turbo_statistics_;
|
|
turbo_statistics_ = nullptr;
|
|
delete hstatistics_;
|
|
hstatistics_ = nullptr;
|
|
if (FLAG_runtime_call_stats) {
|
|
OFStream os(stdout);
|
|
counters()->runtime_call_stats()->Print(os);
|
|
counters()->runtime_call_stats()->Reset();
|
|
}
|
|
}
|
|
|
|
|
|
HStatistics* Isolate::GetHStatistics() {
|
|
if (hstatistics() == NULL) set_hstatistics(new HStatistics());
|
|
return hstatistics();
|
|
}
|
|
|
|
|
|
CompilationStatistics* Isolate::GetTurboStatistics() {
|
|
if (turbo_statistics() == NULL)
|
|
set_turbo_statistics(new CompilationStatistics());
|
|
return turbo_statistics();
|
|
}
|
|
|
|
|
|
HTracer* Isolate::GetHTracer() {
|
|
if (htracer() == NULL) set_htracer(new HTracer(id()));
|
|
return htracer();
|
|
}
|
|
|
|
|
|
CodeTracer* Isolate::GetCodeTracer() {
|
|
if (code_tracer() == NULL) set_code_tracer(new CodeTracer(id()));
|
|
return code_tracer();
|
|
}
|
|
|
|
Map* Isolate::get_initial_js_array_map(ElementsKind kind) {
|
|
if (IsFastElementsKind(kind)) {
|
|
DisallowHeapAllocation no_gc;
|
|
Object* const initial_js_array_map =
|
|
context()->native_context()->get(Context::ArrayMapIndex(kind));
|
|
if (!initial_js_array_map->IsUndefined()) {
|
|
return Map::cast(initial_js_array_map);
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
|
|
bool Isolate::use_crankshaft() const {
|
|
return FLAG_crankshaft &&
|
|
!serializer_enabled_ &&
|
|
CpuFeatures::SupportsCrankshaft();
|
|
}
|
|
|
|
|
|
bool Isolate::IsFastArrayConstructorPrototypeChainIntact() {
|
|
PropertyCell* no_elements_cell = heap()->array_protector();
|
|
bool cell_reports_intact =
|
|
no_elements_cell->value()->IsSmi() &&
|
|
Smi::cast(no_elements_cell->value())->value() == kArrayProtectorValid;
|
|
|
|
#ifdef DEBUG
|
|
Map* root_array_map =
|
|
get_initial_js_array_map(GetInitialFastElementsKind());
|
|
Context* native_context = context()->native_context();
|
|
JSObject* initial_array_proto = JSObject::cast(
|
|
native_context->get(Context::INITIAL_ARRAY_PROTOTYPE_INDEX));
|
|
JSObject* initial_object_proto = JSObject::cast(
|
|
native_context->get(Context::INITIAL_OBJECT_PROTOTYPE_INDEX));
|
|
|
|
if (root_array_map == NULL || initial_array_proto == initial_object_proto) {
|
|
// We are in the bootstrapping process, and the entire check sequence
|
|
// shouldn't be performed.
|
|
return cell_reports_intact;
|
|
}
|
|
|
|
// Check that the array prototype hasn't been altered WRT empty elements.
|
|
if (root_array_map->prototype() != initial_array_proto) {
|
|
DCHECK_EQ(false, cell_reports_intact);
|
|
return cell_reports_intact;
|
|
}
|
|
|
|
FixedArrayBase* elements = initial_array_proto->elements();
|
|
if (elements != heap()->empty_fixed_array() &&
|
|
elements != heap()->empty_slow_element_dictionary()) {
|
|
DCHECK_EQ(false, cell_reports_intact);
|
|
return cell_reports_intact;
|
|
}
|
|
|
|
// Check that the object prototype hasn't been altered WRT empty elements.
|
|
PrototypeIterator iter(this, initial_array_proto);
|
|
if (iter.IsAtEnd() || iter.GetCurrent() != initial_object_proto) {
|
|
DCHECK_EQ(false, cell_reports_intact);
|
|
return cell_reports_intact;
|
|
}
|
|
|
|
elements = initial_object_proto->elements();
|
|
if (elements != heap()->empty_fixed_array() &&
|
|
elements != heap()->empty_slow_element_dictionary()) {
|
|
DCHECK_EQ(false, cell_reports_intact);
|
|
return cell_reports_intact;
|
|
}
|
|
|
|
iter.Advance();
|
|
if (!iter.IsAtEnd()) {
|
|
DCHECK_EQ(false, cell_reports_intact);
|
|
return cell_reports_intact;
|
|
}
|
|
|
|
#endif
|
|
|
|
return cell_reports_intact;
|
|
}
|
|
|
|
bool Isolate::IsArraySpeciesLookupChainIntact() {
|
|
// Note: It would be nice to have debug checks to make sure that the
|
|
// species protector is accurate, but this would be hard to do for most of
|
|
// what the protector stands for:
|
|
// - You'd need to traverse the heap to check that no Array instance has
|
|
// a constructor property or a modified __proto__
|
|
// - To check that Array[Symbol.species] == Array, JS code has to execute,
|
|
// but JS cannot be invoked in callstack overflow situations
|
|
// All that could be checked reliably is that
|
|
// Array.prototype.constructor == Array. Given that limitation, no check is
|
|
// done here. In place, there are mjsunit tests harmony/array-species* which
|
|
// ensure that behavior is correct in various invalid protector cases.
|
|
|
|
PropertyCell* species_cell = heap()->species_protector();
|
|
return species_cell->value()->IsSmi() &&
|
|
Smi::cast(species_cell->value())->value() == kArrayProtectorValid;
|
|
}
|
|
|
|
void Isolate::InvalidateArraySpeciesProtector() {
|
|
DCHECK(factory()->species_protector()->value()->IsSmi());
|
|
DCHECK(IsArraySpeciesLookupChainIntact());
|
|
PropertyCell::SetValueWithInvalidation(
|
|
factory()->species_protector(),
|
|
handle(Smi::FromInt(kArrayProtectorInvalid), this));
|
|
DCHECK(!IsArraySpeciesLookupChainIntact());
|
|
}
|
|
|
|
void Isolate::UpdateArrayProtectorOnSetElement(Handle<JSObject> object) {
|
|
DisallowHeapAllocation no_gc;
|
|
if (IsFastArrayConstructorPrototypeChainIntact() &&
|
|
object->map()->is_prototype_map()) {
|
|
Object* context = heap()->native_contexts_list();
|
|
while (!context->IsUndefined()) {
|
|
Context* current_context = Context::cast(context);
|
|
if (current_context->get(Context::INITIAL_OBJECT_PROTOTYPE_INDEX) ==
|
|
*object ||
|
|
current_context->get(Context::INITIAL_ARRAY_PROTOTYPE_INDEX) ==
|
|
*object) {
|
|
CountUsage(v8::Isolate::UseCounterFeature::kArrayProtectorDirtied);
|
|
PropertyCell::SetValueWithInvalidation(
|
|
factory()->array_protector(),
|
|
handle(Smi::FromInt(kArrayProtectorInvalid), this));
|
|
break;
|
|
}
|
|
context = current_context->get(Context::NEXT_CONTEXT_LINK);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
bool Isolate::IsAnyInitialArrayPrototype(Handle<JSArray> array) {
|
|
if (array->map()->is_prototype_map()) {
|
|
Object* context = heap()->native_contexts_list();
|
|
while (!context->IsUndefined()) {
|
|
Context* current_context = Context::cast(context);
|
|
if (current_context->get(Context::INITIAL_ARRAY_PROTOTYPE_INDEX) ==
|
|
*array) {
|
|
return true;
|
|
}
|
|
context = current_context->get(Context::NEXT_CONTEXT_LINK);
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
CallInterfaceDescriptorData* Isolate::call_descriptor_data(int index) {
|
|
DCHECK(0 <= index && index < CallDescriptors::NUMBER_OF_DESCRIPTORS);
|
|
return &call_descriptor_data_[index];
|
|
}
|
|
|
|
|
|
base::RandomNumberGenerator* Isolate::random_number_generator() {
|
|
if (random_number_generator_ == NULL) {
|
|
if (FLAG_random_seed != 0) {
|
|
random_number_generator_ =
|
|
new base::RandomNumberGenerator(FLAG_random_seed);
|
|
} else {
|
|
random_number_generator_ = new base::RandomNumberGenerator();
|
|
}
|
|
}
|
|
return random_number_generator_;
|
|
}
|
|
|
|
|
|
Object* Isolate::FindCodeObject(Address a) {
|
|
return inner_pointer_to_code_cache()->GcSafeFindCodeForInnerPointer(a);
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
#define ISOLATE_FIELD_OFFSET(type, name, ignored) \
|
|
const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
|
|
ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
|
|
ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
|
|
#undef ISOLATE_FIELD_OFFSET
|
|
#endif
|
|
|
|
|
|
Handle<JSObject> Isolate::SetUpSubregistry(Handle<JSObject> registry,
|
|
Handle<Map> map, const char* cname) {
|
|
Handle<String> name = factory()->InternalizeUtf8String(cname);
|
|
Handle<JSObject> obj = factory()->NewJSObjectFromMap(map);
|
|
JSObject::NormalizeProperties(obj, CLEAR_INOBJECT_PROPERTIES, 0,
|
|
"SetupSymbolRegistry");
|
|
JSObject::AddProperty(registry, name, obj, NONE);
|
|
return obj;
|
|
}
|
|
|
|
|
|
Handle<JSObject> Isolate::GetSymbolRegistry() {
|
|
if (heap()->symbol_registry()->IsSmi()) {
|
|
Handle<Map> map = factory()->NewMap(JS_OBJECT_TYPE, JSObject::kHeaderSize);
|
|
Handle<JSObject> registry = factory()->NewJSObjectFromMap(map);
|
|
heap()->set_symbol_registry(*registry);
|
|
|
|
SetUpSubregistry(registry, map, "for");
|
|
SetUpSubregistry(registry, map, "for_api");
|
|
SetUpSubregistry(registry, map, "keyFor");
|
|
SetUpSubregistry(registry, map, "private_api");
|
|
}
|
|
return Handle<JSObject>::cast(factory()->symbol_registry());
|
|
}
|
|
|
|
|
|
void Isolate::AddBeforeCallEnteredCallback(BeforeCallEnteredCallback callback) {
|
|
for (int i = 0; i < before_call_entered_callbacks_.length(); i++) {
|
|
if (callback == before_call_entered_callbacks_.at(i)) return;
|
|
}
|
|
before_call_entered_callbacks_.Add(callback);
|
|
}
|
|
|
|
|
|
void Isolate::RemoveBeforeCallEnteredCallback(
|
|
BeforeCallEnteredCallback callback) {
|
|
for (int i = 0; i < before_call_entered_callbacks_.length(); i++) {
|
|
if (callback == before_call_entered_callbacks_.at(i)) {
|
|
before_call_entered_callbacks_.Remove(i);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::FireBeforeCallEnteredCallback() {
|
|
for (int i = 0; i < before_call_entered_callbacks_.length(); i++) {
|
|
before_call_entered_callbacks_.at(i)(reinterpret_cast<v8::Isolate*>(this));
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::AddCallCompletedCallback(CallCompletedCallback callback) {
|
|
for (int i = 0; i < call_completed_callbacks_.length(); i++) {
|
|
if (callback == call_completed_callbacks_.at(i)) return;
|
|
}
|
|
call_completed_callbacks_.Add(callback);
|
|
}
|
|
|
|
|
|
void Isolate::RemoveCallCompletedCallback(CallCompletedCallback callback) {
|
|
for (int i = 0; i < call_completed_callbacks_.length(); i++) {
|
|
if (callback == call_completed_callbacks_.at(i)) {
|
|
call_completed_callbacks_.Remove(i);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::FireCallCompletedCallback() {
|
|
bool has_call_completed_callbacks = !call_completed_callbacks_.is_empty();
|
|
bool run_microtasks =
|
|
pending_microtask_count() &&
|
|
!handle_scope_implementer()->HasMicrotasksSuppressions() &&
|
|
handle_scope_implementer()->microtasks_policy() ==
|
|
v8::MicrotasksPolicy::kAuto;
|
|
if (!has_call_completed_callbacks && !run_microtasks) return;
|
|
|
|
if (!handle_scope_implementer()->CallDepthIsZero()) return;
|
|
if (run_microtasks) RunMicrotasks();
|
|
// Fire callbacks. Increase call depth to prevent recursive callbacks.
|
|
v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(this);
|
|
v8::Isolate::SuppressMicrotaskExecutionScope suppress(isolate);
|
|
for (int i = 0; i < call_completed_callbacks_.length(); i++) {
|
|
call_completed_callbacks_.at(i)(isolate);
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::SetPromiseRejectCallback(PromiseRejectCallback callback) {
|
|
promise_reject_callback_ = callback;
|
|
}
|
|
|
|
|
|
void Isolate::ReportPromiseReject(Handle<JSObject> promise,
|
|
Handle<Object> value,
|
|
v8::PromiseRejectEvent event) {
|
|
if (promise_reject_callback_ == NULL) return;
|
|
Handle<JSArray> stack_trace;
|
|
if (event == v8::kPromiseRejectWithNoHandler && value->IsJSObject()) {
|
|
stack_trace = GetDetailedStackTrace(Handle<JSObject>::cast(value));
|
|
}
|
|
promise_reject_callback_(v8::PromiseRejectMessage(
|
|
v8::Utils::PromiseToLocal(promise), event, v8::Utils::ToLocal(value),
|
|
v8::Utils::StackTraceToLocal(stack_trace)));
|
|
}
|
|
|
|
|
|
void Isolate::EnqueueMicrotask(Handle<Object> microtask) {
|
|
DCHECK(microtask->IsJSFunction() || microtask->IsCallHandlerInfo());
|
|
Handle<FixedArray> queue(heap()->microtask_queue(), this);
|
|
int num_tasks = pending_microtask_count();
|
|
DCHECK(num_tasks <= queue->length());
|
|
if (num_tasks == 0) {
|
|
queue = factory()->NewFixedArray(8);
|
|
heap()->set_microtask_queue(*queue);
|
|
} else if (num_tasks == queue->length()) {
|
|
queue = factory()->CopyFixedArrayAndGrow(queue, num_tasks);
|
|
heap()->set_microtask_queue(*queue);
|
|
}
|
|
DCHECK(queue->get(num_tasks)->IsUndefined());
|
|
queue->set(num_tasks, *microtask);
|
|
set_pending_microtask_count(num_tasks + 1);
|
|
}
|
|
|
|
|
|
void Isolate::RunMicrotasks() {
|
|
// Increase call depth to prevent recursive callbacks.
|
|
v8::Isolate::SuppressMicrotaskExecutionScope suppress(
|
|
reinterpret_cast<v8::Isolate*>(this));
|
|
RunMicrotasksInternal();
|
|
FireMicrotasksCompletedCallback();
|
|
}
|
|
|
|
|
|
void Isolate::RunMicrotasksInternal() {
|
|
while (pending_microtask_count() > 0) {
|
|
HandleScope scope(this);
|
|
int num_tasks = pending_microtask_count();
|
|
Handle<FixedArray> queue(heap()->microtask_queue(), this);
|
|
DCHECK(num_tasks <= queue->length());
|
|
set_pending_microtask_count(0);
|
|
heap()->set_microtask_queue(heap()->empty_fixed_array());
|
|
|
|
Isolate* isolate = this;
|
|
FOR_WITH_HANDLE_SCOPE(isolate, int, i = 0, i, i < num_tasks, i++, {
|
|
Handle<Object> microtask(queue->get(i), this);
|
|
if (microtask->IsJSFunction()) {
|
|
Handle<JSFunction> microtask_function =
|
|
Handle<JSFunction>::cast(microtask);
|
|
SaveContext save(this);
|
|
set_context(microtask_function->context()->native_context());
|
|
MaybeHandle<Object> maybe_exception;
|
|
MaybeHandle<Object> result = Execution::TryCall(
|
|
this, microtask_function, factory()->undefined_value(), 0, NULL,
|
|
&maybe_exception);
|
|
// If execution is terminating, just bail out.
|
|
Handle<Object> exception;
|
|
if (result.is_null() && maybe_exception.is_null()) {
|
|
// Clear out any remaining callbacks in the queue.
|
|
heap()->set_microtask_queue(heap()->empty_fixed_array());
|
|
set_pending_microtask_count(0);
|
|
return;
|
|
}
|
|
} else {
|
|
Handle<CallHandlerInfo> callback_info =
|
|
Handle<CallHandlerInfo>::cast(microtask);
|
|
v8::MicrotaskCallback callback =
|
|
v8::ToCData<v8::MicrotaskCallback>(callback_info->callback());
|
|
void* data = v8::ToCData<void*>(callback_info->data());
|
|
callback(data);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::AddMicrotasksCompletedCallback(
|
|
MicrotasksCompletedCallback callback) {
|
|
for (int i = 0; i < microtasks_completed_callbacks_.length(); i++) {
|
|
if (callback == microtasks_completed_callbacks_.at(i)) return;
|
|
}
|
|
microtasks_completed_callbacks_.Add(callback);
|
|
}
|
|
|
|
|
|
void Isolate::RemoveMicrotasksCompletedCallback(
|
|
MicrotasksCompletedCallback callback) {
|
|
for (int i = 0; i < microtasks_completed_callbacks_.length(); i++) {
|
|
if (callback == microtasks_completed_callbacks_.at(i)) {
|
|
microtasks_completed_callbacks_.Remove(i);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::FireMicrotasksCompletedCallback() {
|
|
for (int i = 0; i < microtasks_completed_callbacks_.length(); i++) {
|
|
microtasks_completed_callbacks_.at(i)(reinterpret_cast<v8::Isolate*>(this));
|
|
}
|
|
}
|
|
|
|
|
|
void Isolate::SetUseCounterCallback(v8::Isolate::UseCounterCallback callback) {
|
|
DCHECK(!use_counter_callback_);
|
|
use_counter_callback_ = callback;
|
|
}
|
|
|
|
|
|
void Isolate::CountUsage(v8::Isolate::UseCounterFeature feature) {
|
|
// The counter callback may cause the embedder to call into V8, which is not
|
|
// generally possible during GC.
|
|
if (heap_.gc_state() == Heap::NOT_IN_GC) {
|
|
if (use_counter_callback_) {
|
|
HandleScope handle_scope(this);
|
|
use_counter_callback_(reinterpret_cast<v8::Isolate*>(this), feature);
|
|
}
|
|
} else {
|
|
heap_.IncrementDeferredCount(feature);
|
|
}
|
|
}
|
|
|
|
|
|
BasicBlockProfiler* Isolate::GetOrCreateBasicBlockProfiler() {
|
|
if (basic_block_profiler_ == NULL) {
|
|
basic_block_profiler_ = new BasicBlockProfiler();
|
|
}
|
|
return basic_block_profiler_;
|
|
}
|
|
|
|
|
|
std::string Isolate::GetTurboCfgFileName() {
|
|
if (FLAG_trace_turbo_cfg_file == NULL) {
|
|
std::ostringstream os;
|
|
os << "turbo-" << base::OS::GetCurrentProcessId() << "-" << id() << ".cfg";
|
|
return os.str();
|
|
} else {
|
|
return FLAG_trace_turbo_cfg_file;
|
|
}
|
|
}
|
|
|
|
void Isolate::SetTailCallEliminationEnabled(bool enabled) {
|
|
if (is_tail_call_elimination_enabled_ == enabled) return;
|
|
is_tail_call_elimination_enabled_ = enabled;
|
|
// TODO(ishell): Introduce DependencyGroup::kTailCallChangedGroup to
|
|
// deoptimize only those functions that are affected by the change of this
|
|
// flag.
|
|
internal::Deoptimizer::DeoptimizeAll(this);
|
|
}
|
|
|
|
// Heap::detached_contexts tracks detached contexts as pairs
|
|
// (number of GC since the context was detached, the context).
|
|
void Isolate::AddDetachedContext(Handle<Context> context) {
|
|
HandleScope scope(this);
|
|
Handle<WeakCell> cell = factory()->NewWeakCell(context);
|
|
Handle<FixedArray> detached_contexts(heap()->detached_contexts());
|
|
int length = detached_contexts->length();
|
|
detached_contexts = factory()->CopyFixedArrayAndGrow(detached_contexts, 2);
|
|
detached_contexts->set(length, Smi::FromInt(0));
|
|
detached_contexts->set(length + 1, *cell);
|
|
heap()->set_detached_contexts(*detached_contexts);
|
|
}
|
|
|
|
|
|
void Isolate::CheckDetachedContextsAfterGC() {
|
|
HandleScope scope(this);
|
|
Handle<FixedArray> detached_contexts(heap()->detached_contexts());
|
|
int length = detached_contexts->length();
|
|
if (length == 0) return;
|
|
int new_length = 0;
|
|
for (int i = 0; i < length; i += 2) {
|
|
int mark_sweeps = Smi::cast(detached_contexts->get(i))->value();
|
|
DCHECK(detached_contexts->get(i + 1)->IsWeakCell());
|
|
WeakCell* cell = WeakCell::cast(detached_contexts->get(i + 1));
|
|
if (!cell->cleared()) {
|
|
detached_contexts->set(new_length, Smi::FromInt(mark_sweeps + 1));
|
|
detached_contexts->set(new_length + 1, cell);
|
|
new_length += 2;
|
|
}
|
|
counters()->detached_context_age_in_gc()->AddSample(mark_sweeps + 1);
|
|
}
|
|
if (FLAG_trace_detached_contexts) {
|
|
PrintF("%d detached contexts are collected out of %d\n",
|
|
length - new_length, length);
|
|
for (int i = 0; i < new_length; i += 2) {
|
|
int mark_sweeps = Smi::cast(detached_contexts->get(i))->value();
|
|
DCHECK(detached_contexts->get(i + 1)->IsWeakCell());
|
|
WeakCell* cell = WeakCell::cast(detached_contexts->get(i + 1));
|
|
if (mark_sweeps > 3) {
|
|
PrintF("detached context 0x%p\n survived %d GCs (leak?)\n",
|
|
static_cast<void*>(cell->value()), mark_sweeps);
|
|
}
|
|
}
|
|
}
|
|
if (new_length == 0) {
|
|
heap()->set_detached_contexts(heap()->empty_fixed_array());
|
|
} else if (new_length < length) {
|
|
heap()->RightTrimFixedArray<Heap::CONCURRENT_TO_SWEEPER>(
|
|
*detached_contexts, length - new_length);
|
|
}
|
|
}
|
|
|
|
|
|
bool StackLimitCheck::JsHasOverflowed(uintptr_t gap) const {
|
|
StackGuard* stack_guard = isolate_->stack_guard();
|
|
#ifdef USE_SIMULATOR
|
|
// The simulator uses a separate JS stack.
|
|
Address jssp_address = Simulator::current(isolate_)->get_sp();
|
|
uintptr_t jssp = reinterpret_cast<uintptr_t>(jssp_address);
|
|
if (jssp - gap < stack_guard->real_jslimit()) return true;
|
|
#endif // USE_SIMULATOR
|
|
return GetCurrentStackPosition() - gap < stack_guard->real_climit();
|
|
}
|
|
|
|
|
|
SaveContext::SaveContext(Isolate* isolate)
|
|
: isolate_(isolate), prev_(isolate->save_context()) {
|
|
if (isolate->context() != NULL) {
|
|
context_ = Handle<Context>(isolate->context());
|
|
}
|
|
isolate->set_save_context(this);
|
|
|
|
c_entry_fp_ = isolate->c_entry_fp(isolate->thread_local_top());
|
|
}
|
|
|
|
|
|
SaveContext::~SaveContext() {
|
|
isolate_->set_context(context_.is_null() ? NULL : *context_);
|
|
isolate_->set_save_context(prev_);
|
|
}
|
|
|
|
|
|
#ifdef DEBUG
|
|
AssertNoContextChange::AssertNoContextChange(Isolate* isolate)
|
|
: isolate_(isolate), context_(isolate->context(), isolate) {}
|
|
#endif // DEBUG
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bool PostponeInterruptsScope::Intercept(StackGuard::InterruptFlag flag) {
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// First check whether the previous scope intercepts.
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if (prev_ && prev_->Intercept(flag)) return true;
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// Then check whether this scope intercepts.
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if ((flag & intercept_mask_)) {
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intercepted_flags_ |= flag;
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return true;
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}
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return false;
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}
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} // namespace internal
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} // namespace v8
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