Update V8 to r7427: Initial merge by git
As required by WebKit r82507
Change-Id: I7ae83ef3f689356043b4929255b7c1dd31d8c5df
diff --git a/src/isolate.cc b/src/isolate.cc
new file mode 100644
index 0000000..a163532
--- /dev/null
+++ b/src/isolate.cc
@@ -0,0 +1,895 @@
+// Copyright 2006-2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <stdlib.h>
+
+#include "v8.h"
+
+#include "ast.h"
+#include "bootstrapper.h"
+#include "codegen.h"
+#include "compilation-cache.h"
+#include "debug.h"
+#include "deoptimizer.h"
+#include "heap-profiler.h"
+#include "hydrogen.h"
+#include "isolate.h"
+#include "lithium-allocator.h"
+#include "log.h"
+#include "regexp-stack.h"
+#include "runtime-profiler.h"
+#include "scanner.h"
+#include "scopeinfo.h"
+#include "serialize.h"
+#include "simulator.h"
+#include "spaces.h"
+#include "stub-cache.h"
+#include "version.h"
+
+
+namespace v8 {
+namespace internal {
+
+
+// Create a dummy thread that will wait forever on a semaphore. The only
+// purpose for this thread is to have some stack area to save essential data
+// into for use by a stacks only core dump (aka minidump).
+class PreallocatedMemoryThread: public Thread {
+ public:
+ char* data() {
+ if (data_ready_semaphore_ != NULL) {
+ // Initial access is guarded until the data has been published.
+ data_ready_semaphore_->Wait();
+ delete data_ready_semaphore_;
+ data_ready_semaphore_ = NULL;
+ }
+ return data_;
+ }
+
+ unsigned length() {
+ if (data_ready_semaphore_ != NULL) {
+ // Initial access is guarded until the data has been published.
+ data_ready_semaphore_->Wait();
+ delete data_ready_semaphore_;
+ data_ready_semaphore_ = NULL;
+ }
+ return length_;
+ }
+
+ // Stop the PreallocatedMemoryThread and release its resources.
+ void StopThread() {
+ keep_running_ = false;
+ wait_for_ever_semaphore_->Signal();
+
+ // Wait for the thread to terminate.
+ Join();
+
+ if (data_ready_semaphore_ != NULL) {
+ delete data_ready_semaphore_;
+ data_ready_semaphore_ = NULL;
+ }
+
+ delete wait_for_ever_semaphore_;
+ wait_for_ever_semaphore_ = NULL;
+ }
+
+ protected:
+ // When the thread starts running it will allocate a fixed number of bytes
+ // on the stack and publish the location of this memory for others to use.
+ void Run() {
+ EmbeddedVector<char, 15 * 1024> local_buffer;
+
+ // Initialize the buffer with a known good value.
+ OS::StrNCpy(local_buffer, "Trace data was not generated.\n",
+ local_buffer.length());
+
+ // Publish the local buffer and signal its availability.
+ data_ = local_buffer.start();
+ length_ = local_buffer.length();
+ data_ready_semaphore_->Signal();
+
+ while (keep_running_) {
+ // This thread will wait here until the end of time.
+ wait_for_ever_semaphore_->Wait();
+ }
+
+ // Make sure we access the buffer after the wait to remove all possibility
+ // of it being optimized away.
+ OS::StrNCpy(local_buffer, "PreallocatedMemoryThread shutting down.\n",
+ local_buffer.length());
+ }
+
+
+ private:
+ explicit PreallocatedMemoryThread(Isolate* isolate)
+ : Thread(isolate, "v8:PreallocMem"),
+ keep_running_(true),
+ wait_for_ever_semaphore_(OS::CreateSemaphore(0)),
+ data_ready_semaphore_(OS::CreateSemaphore(0)),
+ data_(NULL),
+ length_(0) {
+ }
+
+ // Used to make sure that the thread keeps looping even for spurious wakeups.
+ bool keep_running_;
+
+ // This semaphore is used by the PreallocatedMemoryThread to wait for ever.
+ Semaphore* wait_for_ever_semaphore_;
+ // Semaphore to signal that the data has been initialized.
+ Semaphore* data_ready_semaphore_;
+
+ // Location and size of the preallocated memory block.
+ char* data_;
+ unsigned length_;
+
+ friend class Isolate;
+
+ DISALLOW_COPY_AND_ASSIGN(PreallocatedMemoryThread);
+};
+
+
+void Isolate::PreallocatedMemoryThreadStart() {
+ if (preallocated_memory_thread_ != NULL) return;
+ preallocated_memory_thread_ = new PreallocatedMemoryThread(this);
+ preallocated_memory_thread_->Start();
+}
+
+
+void Isolate::PreallocatedMemoryThreadStop() {
+ if (preallocated_memory_thread_ == NULL) return;
+ preallocated_memory_thread_->StopThread();
+ // Done with the thread entirely.
+ delete preallocated_memory_thread_;
+ preallocated_memory_thread_ = NULL;
+}
+
+
+void Isolate::PreallocatedStorageInit(size_t size) {
+ ASSERT(free_list_.next_ == &free_list_);
+ ASSERT(free_list_.previous_ == &free_list_);
+ PreallocatedStorage* free_chunk =
+ reinterpret_cast<PreallocatedStorage*>(new char[size]);
+ free_list_.next_ = free_list_.previous_ = free_chunk;
+ free_chunk->next_ = free_chunk->previous_ = &free_list_;
+ free_chunk->size_ = size - sizeof(PreallocatedStorage);
+ preallocated_storage_preallocated_ = true;
+}
+
+
+void* Isolate::PreallocatedStorageNew(size_t size) {
+ if (!preallocated_storage_preallocated_) {
+ return FreeStoreAllocationPolicy::New(size);
+ }
+ ASSERT(free_list_.next_ != &free_list_);
+ ASSERT(free_list_.previous_ != &free_list_);
+
+ size = (size + kPointerSize - 1) & ~(kPointerSize - 1);
+ // Search for exact fit.
+ for (PreallocatedStorage* storage = free_list_.next_;
+ storage != &free_list_;
+ storage = storage->next_) {
+ if (storage->size_ == size) {
+ storage->Unlink();
+ storage->LinkTo(&in_use_list_);
+ return reinterpret_cast<void*>(storage + 1);
+ }
+ }
+ // Search for first fit.
+ for (PreallocatedStorage* storage = free_list_.next_;
+ storage != &free_list_;
+ storage = storage->next_) {
+ if (storage->size_ >= size + sizeof(PreallocatedStorage)) {
+ storage->Unlink();
+ storage->LinkTo(&in_use_list_);
+ PreallocatedStorage* left_over =
+ reinterpret_cast<PreallocatedStorage*>(
+ reinterpret_cast<char*>(storage + 1) + size);
+ left_over->size_ = storage->size_ - size - sizeof(PreallocatedStorage);
+ ASSERT(size + left_over->size_ + sizeof(PreallocatedStorage) ==
+ storage->size_);
+ storage->size_ = size;
+ left_over->LinkTo(&free_list_);
+ return reinterpret_cast<void*>(storage + 1);
+ }
+ }
+ // Allocation failure.
+ ASSERT(false);
+ return NULL;
+}
+
+
+// We don't attempt to coalesce.
+void Isolate::PreallocatedStorageDelete(void* p) {
+ if (p == NULL) {
+ return;
+ }
+ if (!preallocated_storage_preallocated_) {
+ FreeStoreAllocationPolicy::Delete(p);
+ return;
+ }
+ PreallocatedStorage* storage = reinterpret_cast<PreallocatedStorage*>(p) - 1;
+ ASSERT(storage->next_->previous_ == storage);
+ ASSERT(storage->previous_->next_ == storage);
+ storage->Unlink();
+ storage->LinkTo(&free_list_);
+}
+
+
+Isolate* Isolate::default_isolate_ = NULL;
+Thread::LocalStorageKey Isolate::isolate_key_;
+Thread::LocalStorageKey Isolate::thread_id_key_;
+Thread::LocalStorageKey Isolate::per_isolate_thread_data_key_;
+Mutex* Isolate::process_wide_mutex_ = OS::CreateMutex();
+Isolate::ThreadDataTable* Isolate::thread_data_table_ = NULL;
+Isolate::ThreadId Isolate::highest_thread_id_ = 0;
+
+
+class IsolateInitializer {
+ public:
+ IsolateInitializer() {
+ Isolate::EnsureDefaultIsolate();
+ }
+};
+
+static IsolateInitializer* EnsureDefaultIsolateAllocated() {
+ // TODO(isolates): Use the system threading API to do this once?
+ static IsolateInitializer static_initializer;
+ return &static_initializer;
+}
+
+// This variable only needed to trigger static intialization.
+static IsolateInitializer* static_initializer = EnsureDefaultIsolateAllocated();
+
+
+Isolate::ThreadId Isolate::AllocateThreadId() {
+ ThreadId new_id;
+ {
+ ScopedLock lock(process_wide_mutex_);
+ new_id = ++highest_thread_id_;
+ }
+ return new_id;
+}
+
+
+Isolate::PerIsolateThreadData* Isolate::AllocatePerIsolateThreadData(
+ ThreadId thread_id) {
+ ASSERT(thread_id != 0);
+ ASSERT(Thread::GetThreadLocalInt(thread_id_key_) == thread_id);
+ PerIsolateThreadData* per_thread = new PerIsolateThreadData(this, thread_id);
+ {
+ ScopedLock lock(process_wide_mutex_);
+ ASSERT(thread_data_table_->Lookup(this, thread_id) == NULL);
+ thread_data_table_->Insert(per_thread);
+ ASSERT(thread_data_table_->Lookup(this, thread_id) == per_thread);
+ }
+ return per_thread;
+}
+
+
+Isolate::PerIsolateThreadData*
+ Isolate::FindOrAllocatePerThreadDataForThisThread() {
+ ThreadId thread_id = Thread::GetThreadLocalInt(thread_id_key_);
+ if (thread_id == 0) {
+ thread_id = AllocateThreadId();
+ Thread::SetThreadLocalInt(thread_id_key_, thread_id);
+ }
+ PerIsolateThreadData* per_thread = NULL;
+ {
+ ScopedLock lock(process_wide_mutex_);
+ per_thread = thread_data_table_->Lookup(this, thread_id);
+ if (per_thread == NULL) {
+ per_thread = AllocatePerIsolateThreadData(thread_id);
+ }
+ }
+ return per_thread;
+}
+
+
+void Isolate::EnsureDefaultIsolate() {
+ ScopedLock lock(process_wide_mutex_);
+ if (default_isolate_ == NULL) {
+ isolate_key_ = Thread::CreateThreadLocalKey();
+ thread_id_key_ = Thread::CreateThreadLocalKey();
+ per_isolate_thread_data_key_ = Thread::CreateThreadLocalKey();
+ thread_data_table_ = new Isolate::ThreadDataTable();
+ default_isolate_ = new Isolate();
+ }
+ // Can't use SetIsolateThreadLocals(default_isolate_, NULL) here
+ // becase a non-null thread data may be already set.
+ Thread::SetThreadLocal(isolate_key_, default_isolate_);
+ CHECK(default_isolate_->PreInit());
+}
+
+
+Debugger* Isolate::GetDefaultIsolateDebugger() {
+ EnsureDefaultIsolate();
+ return default_isolate_->debugger();
+}
+
+
+StackGuard* Isolate::GetDefaultIsolateStackGuard() {
+ EnsureDefaultIsolate();
+ return default_isolate_->stack_guard();
+}
+
+
+void Isolate::EnterDefaultIsolate() {
+ EnsureDefaultIsolate();
+ ASSERT(default_isolate_ != NULL);
+
+ PerIsolateThreadData* data = CurrentPerIsolateThreadData();
+ // If not yet in default isolate - enter it.
+ if (data == NULL || data->isolate() != default_isolate_) {
+ default_isolate_->Enter();
+ }
+}
+
+
+Isolate* Isolate::GetDefaultIsolateForLocking() {
+ EnsureDefaultIsolate();
+ return default_isolate_;
+}
+
+
+Isolate::ThreadDataTable::ThreadDataTable()
+ : list_(NULL) {
+}
+
+
+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_;
+}
+
+
+void Isolate::ThreadDataTable::Remove(Isolate* isolate, ThreadId thread_id) {
+ PerIsolateThreadData* data = Lookup(isolate, thread_id);
+ if (data != NULL) {
+ Remove(data);
+ }
+}
+
+
+#ifdef DEBUG
+#define TRACE_ISOLATE(tag) \
+ do { \
+ if (FLAG_trace_isolates) { \
+ PrintF("Isolate %p " #tag "\n", reinterpret_cast<void*>(this)); \
+ } \
+ } while (false)
+#else
+#define TRACE_ISOLATE(tag)
+#endif
+
+
+Isolate::Isolate()
+ : state_(UNINITIALIZED),
+ entry_stack_(NULL),
+ stack_trace_nesting_level_(0),
+ incomplete_message_(NULL),
+ preallocated_memory_thread_(NULL),
+ preallocated_message_space_(NULL),
+ bootstrapper_(NULL),
+ runtime_profiler_(NULL),
+ compilation_cache_(NULL),
+ counters_(new Counters()),
+ cpu_features_(NULL),
+ code_range_(NULL),
+ break_access_(OS::CreateMutex()),
+ logger_(new Logger()),
+ stats_table_(new StatsTable()),
+ stub_cache_(NULL),
+ deoptimizer_data_(NULL),
+ capture_stack_trace_for_uncaught_exceptions_(false),
+ stack_trace_for_uncaught_exceptions_frame_limit_(0),
+ stack_trace_for_uncaught_exceptions_options_(StackTrace::kOverview),
+ transcendental_cache_(NULL),
+ memory_allocator_(NULL),
+ keyed_lookup_cache_(NULL),
+ context_slot_cache_(NULL),
+ descriptor_lookup_cache_(NULL),
+ handle_scope_implementer_(NULL),
+ scanner_constants_(NULL),
+ in_use_list_(0),
+ free_list_(0),
+ preallocated_storage_preallocated_(false),
+ pc_to_code_cache_(NULL),
+ write_input_buffer_(NULL),
+ global_handles_(NULL),
+ context_switcher_(NULL),
+ thread_manager_(NULL),
+ ast_sentinels_(NULL),
+ string_tracker_(NULL),
+ regexp_stack_(NULL),
+ frame_element_constant_list_(0),
+ result_constant_list_(0) {
+ TRACE_ISOLATE(constructor);
+
+ memset(isolate_addresses_, 0,
+ sizeof(isolate_addresses_[0]) * (k_isolate_address_count + 1));
+
+ heap_.isolate_ = this;
+ zone_.isolate_ = this;
+ stack_guard_.isolate_ = this;
+
+#if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
+ defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
+ simulator_initialized_ = false;
+ simulator_i_cache_ = NULL;
+ simulator_redirection_ = NULL;
+#endif
+
+#ifdef DEBUG
+ // heap_histograms_ initializes itself.
+ memset(&js_spill_information_, 0, sizeof(js_spill_information_));
+ memset(code_kind_statistics_, 0,
+ sizeof(code_kind_statistics_[0]) * Code::NUMBER_OF_KINDS);
+#endif
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ debug_ = NULL;
+ debugger_ = NULL;
+#endif
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+ producer_heap_profile_ = NULL;
+#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
+}
+
+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();
+ Isolate* saved_isolate = UncheckedCurrent();
+ SetIsolateThreadLocals(this, NULL);
+
+ Deinit();
+
+ if (!IsDefaultIsolate()) {
+ delete this;
+ }
+
+ // Restore the previous current isolate.
+ SetIsolateThreadLocals(saved_isolate, saved_data);
+}
+
+
+void Isolate::Deinit() {
+ if (state_ == INITIALIZED) {
+ TRACE_ISOLATE(deinit);
+
+ if (FLAG_hydrogen_stats) HStatistics::Instance()->Print();
+
+ // We must stop the logger before we tear down other components.
+ logger_->EnsureTickerStopped();
+
+ delete deoptimizer_data_;
+ deoptimizer_data_ = NULL;
+ if (FLAG_preemption) {
+ v8::Locker locker;
+ v8::Locker::StopPreemption();
+ }
+ builtins_.TearDown();
+ bootstrapper_->TearDown();
+
+ // Remove the external reference to the preallocated stack memory.
+ delete preallocated_message_space_;
+ preallocated_message_space_ = NULL;
+ PreallocatedMemoryThreadStop();
+
+ HeapProfiler::TearDown();
+ CpuProfiler::TearDown();
+ if (runtime_profiler_ != NULL) {
+ runtime_profiler_->TearDown();
+ delete runtime_profiler_;
+ runtime_profiler_ = NULL;
+ }
+ heap_.TearDown();
+ logger_->TearDown();
+
+ // The default isolate is re-initializable due to legacy API.
+ state_ = PREINITIALIZED;
+ }
+}
+
+
+void Isolate::SetIsolateThreadLocals(Isolate* isolate,
+ PerIsolateThreadData* data) {
+ Thread::SetThreadLocal(isolate_key_, isolate);
+ Thread::SetThreadLocal(per_isolate_thread_data_key_, data);
+}
+
+
+Isolate::~Isolate() {
+ TRACE_ISOLATE(destructor);
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+ delete producer_heap_profile_;
+ producer_heap_profile_ = NULL;
+#endif
+
+ delete scanner_constants_;
+ scanner_constants_ = NULL;
+
+ delete regexp_stack_;
+ regexp_stack_ = NULL;
+
+ delete ast_sentinels_;
+ ast_sentinels_ = 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 transcendental_cache_;
+ transcendental_cache_ = NULL;
+ delete stub_cache_;
+ stub_cache_ = NULL;
+ delete stats_table_;
+ stats_table_ = NULL;
+
+ delete logger_;
+ logger_ = NULL;
+
+ delete counters_;
+ counters_ = NULL;
+ delete cpu_features_;
+ cpu_features_ = NULL;
+
+ delete handle_scope_implementer_;
+ handle_scope_implementer_ = NULL;
+ delete break_access_;
+ break_access_ = NULL;
+
+ delete compilation_cache_;
+ compilation_cache_ = NULL;
+ delete bootstrapper_;
+ bootstrapper_ = NULL;
+ delete pc_to_code_cache_;
+ pc_to_code_cache_ = NULL;
+ delete write_input_buffer_;
+ write_input_buffer_ = NULL;
+
+ delete context_switcher_;
+ context_switcher_ = NULL;
+ delete thread_manager_;
+ thread_manager_ = NULL;
+
+ delete string_tracker_;
+ string_tracker_ = NULL;
+
+ delete memory_allocator_;
+ memory_allocator_ = NULL;
+ delete code_range_;
+ code_range_ = NULL;
+ delete global_handles_;
+ global_handles_ = NULL;
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ delete debugger_;
+ debugger_ = NULL;
+ delete debug_;
+ debug_ = NULL;
+#endif
+}
+
+
+bool Isolate::PreInit() {
+ if (state_ != UNINITIALIZED) return true;
+
+ TRACE_ISOLATE(preinit);
+
+ ASSERT(Isolate::Current() == this);
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ debug_ = new Debug(this);
+ debugger_ = new Debugger();
+ debugger_->isolate_ = this;
+#endif
+
+ memory_allocator_ = new MemoryAllocator();
+ memory_allocator_->isolate_ = this;
+ code_range_ = new CodeRange();
+ code_range_->isolate_ = this;
+
+ // Safe after setting Heap::isolate_, initializing StackGuard and
+ // ensuring that Isolate::Current() == this.
+ heap_.SetStackLimits();
+
+#ifdef DEBUG
+ DisallowAllocationFailure disallow_allocation_failure;
+#endif
+
+#define C(name) isolate_addresses_[Isolate::k_##name] = \
+ reinterpret_cast<Address>(name());
+ ISOLATE_ADDRESS_LIST(C)
+ ISOLATE_ADDRESS_LIST_PROF(C)
+#undef C
+
+ string_tracker_ = new StringTracker();
+ string_tracker_->isolate_ = this;
+ thread_manager_ = new ThreadManager();
+ thread_manager_->isolate_ = this;
+ compilation_cache_ = new CompilationCache(this);
+ transcendental_cache_ = new TranscendentalCache();
+ keyed_lookup_cache_ = new KeyedLookupCache();
+ context_slot_cache_ = new ContextSlotCache();
+ descriptor_lookup_cache_ = new DescriptorLookupCache();
+ scanner_constants_ = new ScannerConstants();
+ pc_to_code_cache_ = new PcToCodeCache(this);
+ write_input_buffer_ = new StringInputBuffer();
+ global_handles_ = new GlobalHandles(this);
+ bootstrapper_ = new Bootstrapper();
+ cpu_features_ = new CpuFeatures();
+ handle_scope_implementer_ = new HandleScopeImplementer();
+ stub_cache_ = new StubCache(this);
+ ast_sentinels_ = new AstSentinels();
+ regexp_stack_ = new RegExpStack();
+ regexp_stack_->isolate_ = this;
+
+#ifdef ENABLE_LOGGING_AND_PROFILING
+ producer_heap_profile_ = new ProducerHeapProfile();
+ producer_heap_profile_->isolate_ = this;
+#endif
+
+ state_ = PREINITIALIZED;
+ return true;
+}
+
+
+void Isolate::InitializeThreadLocal() {
+ thread_local_top_.Initialize();
+ clear_pending_exception();
+ clear_pending_message();
+ clear_scheduled_exception();
+}
+
+
+bool Isolate::Init(Deserializer* des) {
+ ASSERT(state_ != INITIALIZED);
+
+ TRACE_ISOLATE(init);
+
+ bool create_heap_objects = des == NULL;
+
+#ifdef DEBUG
+ // The initialization process does not handle memory exhaustion.
+ DisallowAllocationFailure disallow_allocation_failure;
+#endif
+
+ if (state_ == UNINITIALIZED && !PreInit()) return false;
+
+ // Enable logging before setting up the heap
+ logger_->Setup();
+
+ CpuProfiler::Setup();
+ HeapProfiler::Setup();
+
+ // Setup the platform OS support.
+ OS::Setup();
+
+ // Initialize other runtime facilities
+#if defined(USE_SIMULATOR)
+#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
+ Simulator::Initialize();
+#endif
+#endif
+
+ { // 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
+ ASSERT(!heap_.HasBeenSetup());
+ if (!heap_.Setup(create_heap_objects)) {
+ V8::SetFatalError();
+ return false;
+ }
+
+ bootstrapper_->Initialize(create_heap_objects);
+ builtins_.Setup(create_heap_objects);
+
+ InitializeThreadLocal();
+
+ // Only preallocate on the first initialization.
+ if (FLAG_preallocate_message_memory && preallocated_message_space_ == NULL) {
+ // Start the thread which will set aside some memory.
+ PreallocatedMemoryThreadStart();
+ preallocated_message_space_ =
+ new NoAllocationStringAllocator(
+ preallocated_memory_thread_->data(),
+ preallocated_memory_thread_->length());
+ PreallocatedStorageInit(preallocated_memory_thread_->length() / 4);
+ }
+
+ if (FLAG_preemption) {
+ v8::Locker locker;
+ v8::Locker::StartPreemption(100);
+ }
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+ debug_->Setup(create_heap_objects);
+#endif
+ stub_cache_->Initialize(create_heap_objects);
+
+ // If we are deserializing, read the state into the now-empty heap.
+ if (des != NULL) {
+ des->Deserialize();
+ stub_cache_->Clear();
+ }
+
+ // Deserializing may put strange things in the root array's copy of the
+ // stack guard.
+ heap_.SetStackLimits();
+
+ // Setup the CPU support. Must be done after heap setup and after
+ // any deserialization because we have to have the initial heap
+ // objects in place for creating the code object used for probing.
+ CPU::Setup();
+
+ deoptimizer_data_ = new DeoptimizerData;
+ runtime_profiler_ = new RuntimeProfiler(this);
+ runtime_profiler_->Setup();
+
+ // If we are deserializing, log non-function code objects and compiled
+ // functions found in the snapshot.
+ if (des != NULL && FLAG_log_code) {
+ HandleScope scope;
+ LOG(this, LogCodeObjects());
+ LOG(this, LogCompiledFunctions());
+ }
+
+ state_ = INITIALIZED;
+ return true;
+}
+
+
+void Isolate::Enter() {
+ Isolate* current_isolate = NULL;
+ PerIsolateThreadData* current_data = CurrentPerIsolateThreadData();
+ if (current_data != NULL) {
+ current_isolate = current_data->isolate_;
+ ASSERT(current_isolate != NULL);
+ if (current_isolate == this) {
+ ASSERT(Current() == this);
+ ASSERT(entry_stack_ != NULL);
+ ASSERT(entry_stack_->previous_thread_data == NULL ||
+ entry_stack_->previous_thread_data->thread_id() ==
+ Thread::GetThreadLocalInt(thread_id_key_));
+ // Same thread re-enters the isolate, no need to re-init anything.
+ entry_stack_->entry_count++;
+ return;
+ }
+ }
+
+ // Threads can have default isolate set into TLS as Current but not yet have
+ // PerIsolateThreadData for it, as it requires more advanced phase of the
+ // initialization. For example, a thread might be the one that system used for
+ // static initializers - in this case the default isolate is set in TLS but
+ // the thread did not yet Enter the isolate. If PerisolateThreadData is not
+ // there, use the isolate set in TLS.
+ if (current_isolate == NULL) {
+ current_isolate = Isolate::UncheckedCurrent();
+ }
+
+ PerIsolateThreadData* data = FindOrAllocatePerThreadDataForThisThread();
+ ASSERT(data != NULL);
+ ASSERT(data->isolate_ == this);
+
+ EntryStackItem* item = new EntryStackItem(current_data,
+ current_isolate,
+ entry_stack_);
+ entry_stack_ = item;
+
+ SetIsolateThreadLocals(this, data);
+
+ CHECK(PreInit());
+
+ // In case it's the first time some thread enters the isolate.
+ set_thread_id(data->thread_id());
+}
+
+
+void Isolate::Exit() {
+ ASSERT(entry_stack_ != NULL);
+ ASSERT(entry_stack_->previous_thread_data == NULL ||
+ entry_stack_->previous_thread_data->thread_id() ==
+ Thread::GetThreadLocalInt(thread_id_key_));
+
+ if (--entry_stack_->entry_count > 0) return;
+
+ ASSERT(CurrentPerIsolateThreadData() != NULL);
+ ASSERT(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::ResetEagerOptimizingData() {
+ compilation_cache_->ResetEagerOptimizingData();
+}
+
+
+#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
+
+} } // namespace v8::internal