blob: e42d78ecdcba94ca9355b69b201fdbbf0fcbe092 [file] [log] [blame]
// Copyright 2011 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 {
Atomic32 ThreadId::highest_thread_id_ = 0;
int ThreadId::AllocateThreadId() {
int new_id = NoBarrier_AtomicIncrement(&highest_thread_id_, 1);
return new_id;
}
int ThreadId::GetCurrentThreadId() {
int thread_id = Thread::GetThreadLocalInt(Isolate::thread_id_key_);
if (thread_id == 0) {
thread_id = AllocateThreadId();
Thread::SetThreadLocalInt(Isolate::thread_id_key_, thread_id);
}
return thread_id;
}
// 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;
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::PerIsolateThreadData* Isolate::AllocatePerIsolateThreadData(
ThreadId thread_id) {
ASSERT(!thread_id.Equals(ThreadId::Invalid()));
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 = ThreadId::Current();
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()),
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),
unicode_cache_(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 unicode_cache_;
unicode_cache_ = 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 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();
unicode_cache_ = new UnicodeCache();
pc_to_code_cache_ = new PcToCodeCache(this);
write_input_buffer_ = new StringInputBuffer();
global_handles_ = new GlobalHandles(this);
bootstrapper_ = new Bootstrapper();
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();
}
void Isolate::PropagatePendingExceptionToExternalTryCatch() {
ASSERT(has_pending_exception());
bool external_caught = IsExternallyCaught();
thread_local_top_.external_caught_exception_ = external_caught;
if (!external_caught) return;
if (thread_local_top_.pending_exception_ == Failure::OutOfMemoryException()) {
// Do not propagate OOM exception: we should kill VM asap.
} else if (thread_local_top_.pending_exception_ ==
heap()->termination_exception()) {
try_catch_handler()->can_continue_ = false;
try_catch_handler()->exception_ = heap()->null_value();
} else {
// At this point all non-object (failure) exceptions have
// been dealt with so this shouldn't fail.
ASSERT(!pending_exception()->IsFailure());
try_catch_handler()->can_continue_ = true;
try_catch_handler()->exception_ = pending_exception();
if (!thread_local_top_.pending_message_obj_->IsTheHole()) {
try_catch_handler()->message_ = thread_local_top_.pending_message_obj_;
}
}
}
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();
// 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();
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().Equals(
ThreadId::Current()));
// 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().Equals(
ThreadId::Current()));
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