1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 #include <stdlib.h>
29
30 #include "v8.h"
31
32 #include "ast.h"
33 #include "bootstrapper.h"
34 #include "codegen.h"
35 #include "compilation-cache.h"
36 #include "debug.h"
37 #include "deoptimizer.h"
38 #include "heap-profiler.h"
39 #include "hydrogen.h"
40 #include "isolate.h"
41 #include "lithium-allocator.h"
42 #include "log.h"
43 #include "messages.h"
44 #include "platform.h"
45 #include "regexp-stack.h"
46 #include "runtime-profiler.h"
47 #include "scopeinfo.h"
48 #include "serialize.h"
49 #include "simulator.h"
50 #include "spaces.h"
51 #include "stub-cache.h"
52 #include "version.h"
53 #include "vm-state-inl.h"
54
55
56 namespace v8 {
57 namespace internal {
58
59 Atomic32 ThreadId::highest_thread_id_ = 0;
60
AllocateThreadId()61 int ThreadId::AllocateThreadId() {
62 int new_id = NoBarrier_AtomicIncrement(&highest_thread_id_, 1);
63 return new_id;
64 }
65
66
GetCurrentThreadId()67 int ThreadId::GetCurrentThreadId() {
68 int thread_id = Thread::GetThreadLocalInt(Isolate::thread_id_key_);
69 if (thread_id == 0) {
70 thread_id = AllocateThreadId();
71 Thread::SetThreadLocalInt(Isolate::thread_id_key_, thread_id);
72 }
73 return thread_id;
74 }
75
76
ThreadLocalTop()77 ThreadLocalTop::ThreadLocalTop() {
78 InitializeInternal();
79 // This flag may be set using v8::V8::IgnoreOutOfMemoryException()
80 // before an isolate is initialized. The initialize methods below do
81 // not touch it to preserve its value.
82 ignore_out_of_memory_ = false;
83 }
84
85
InitializeInternal()86 void ThreadLocalTop::InitializeInternal() {
87 c_entry_fp_ = 0;
88 handler_ = 0;
89 #ifdef USE_SIMULATOR
90 simulator_ = NULL;
91 #endif
92 js_entry_sp_ = NULL;
93 external_callback_ = NULL;
94 current_vm_state_ = EXTERNAL;
95 try_catch_handler_address_ = NULL;
96 context_ = NULL;
97 thread_id_ = ThreadId::Invalid();
98 external_caught_exception_ = false;
99 failed_access_check_callback_ = NULL;
100 save_context_ = NULL;
101 catcher_ = NULL;
102 top_lookup_result_ = NULL;
103
104 // These members are re-initialized later after deserialization
105 // is complete.
106 pending_exception_ = NULL;
107 has_pending_message_ = false;
108 pending_message_obj_ = NULL;
109 pending_message_script_ = NULL;
110 scheduled_exception_ = NULL;
111 }
112
113
Initialize()114 void ThreadLocalTop::Initialize() {
115 InitializeInternal();
116 #ifdef USE_SIMULATOR
117 #ifdef V8_TARGET_ARCH_ARM
118 simulator_ = Simulator::current(isolate_);
119 #elif V8_TARGET_ARCH_MIPS
120 simulator_ = Simulator::current(isolate_);
121 #endif
122 #endif
123 thread_id_ = ThreadId::Current();
124 }
125
126
TryCatchHandler()127 v8::TryCatch* ThreadLocalTop::TryCatchHandler() {
128 return TRY_CATCH_FROM_ADDRESS(try_catch_handler_address());
129 }
130
131
132 // Create a dummy thread that will wait forever on a semaphore. The only
133 // purpose for this thread is to have some stack area to save essential data
134 // into for use by a stacks only core dump (aka minidump).
135 class PreallocatedMemoryThread: public Thread {
136 public:
data()137 char* data() {
138 if (data_ready_semaphore_ != NULL) {
139 // Initial access is guarded until the data has been published.
140 data_ready_semaphore_->Wait();
141 delete data_ready_semaphore_;
142 data_ready_semaphore_ = NULL;
143 }
144 return data_;
145 }
146
length()147 unsigned length() {
148 if (data_ready_semaphore_ != NULL) {
149 // Initial access is guarded until the data has been published.
150 data_ready_semaphore_->Wait();
151 delete data_ready_semaphore_;
152 data_ready_semaphore_ = NULL;
153 }
154 return length_;
155 }
156
157 // Stop the PreallocatedMemoryThread and release its resources.
StopThread()158 void StopThread() {
159 keep_running_ = false;
160 wait_for_ever_semaphore_->Signal();
161
162 // Wait for the thread to terminate.
163 Join();
164
165 if (data_ready_semaphore_ != NULL) {
166 delete data_ready_semaphore_;
167 data_ready_semaphore_ = NULL;
168 }
169
170 delete wait_for_ever_semaphore_;
171 wait_for_ever_semaphore_ = NULL;
172 }
173
174 protected:
175 // When the thread starts running it will allocate a fixed number of bytes
176 // on the stack and publish the location of this memory for others to use.
Run()177 void Run() {
178 EmbeddedVector<char, 15 * 1024> local_buffer;
179
180 // Initialize the buffer with a known good value.
181 OS::StrNCpy(local_buffer, "Trace data was not generated.\n",
182 local_buffer.length());
183
184 // Publish the local buffer and signal its availability.
185 data_ = local_buffer.start();
186 length_ = local_buffer.length();
187 data_ready_semaphore_->Signal();
188
189 while (keep_running_) {
190 // This thread will wait here until the end of time.
191 wait_for_ever_semaphore_->Wait();
192 }
193
194 // Make sure we access the buffer after the wait to remove all possibility
195 // of it being optimized away.
196 OS::StrNCpy(local_buffer, "PreallocatedMemoryThread shutting down.\n",
197 local_buffer.length());
198 }
199
200
201 private:
PreallocatedMemoryThread()202 PreallocatedMemoryThread()
203 : Thread("v8:PreallocMem"),
204 keep_running_(true),
205 wait_for_ever_semaphore_(OS::CreateSemaphore(0)),
206 data_ready_semaphore_(OS::CreateSemaphore(0)),
207 data_(NULL),
208 length_(0) {
209 }
210
211 // Used to make sure that the thread keeps looping even for spurious wakeups.
212 bool keep_running_;
213
214 // This semaphore is used by the PreallocatedMemoryThread to wait for ever.
215 Semaphore* wait_for_ever_semaphore_;
216 // Semaphore to signal that the data has been initialized.
217 Semaphore* data_ready_semaphore_;
218
219 // Location and size of the preallocated memory block.
220 char* data_;
221 unsigned length_;
222
223 friend class Isolate;
224
225 DISALLOW_COPY_AND_ASSIGN(PreallocatedMemoryThread);
226 };
227
228
PreallocatedMemoryThreadStart()229 void Isolate::PreallocatedMemoryThreadStart() {
230 if (preallocated_memory_thread_ != NULL) return;
231 preallocated_memory_thread_ = new PreallocatedMemoryThread();
232 preallocated_memory_thread_->Start();
233 }
234
235
PreallocatedMemoryThreadStop()236 void Isolate::PreallocatedMemoryThreadStop() {
237 if (preallocated_memory_thread_ == NULL) return;
238 preallocated_memory_thread_->StopThread();
239 // Done with the thread entirely.
240 delete preallocated_memory_thread_;
241 preallocated_memory_thread_ = NULL;
242 }
243
244
PreallocatedStorageInit(size_t size)245 void Isolate::PreallocatedStorageInit(size_t size) {
246 ASSERT(free_list_.next_ == &free_list_);
247 ASSERT(free_list_.previous_ == &free_list_);
248 PreallocatedStorage* free_chunk =
249 reinterpret_cast<PreallocatedStorage*>(new char[size]);
250 free_list_.next_ = free_list_.previous_ = free_chunk;
251 free_chunk->next_ = free_chunk->previous_ = &free_list_;
252 free_chunk->size_ = size - sizeof(PreallocatedStorage);
253 preallocated_storage_preallocated_ = true;
254 }
255
256
PreallocatedStorageNew(size_t size)257 void* Isolate::PreallocatedStorageNew(size_t size) {
258 if (!preallocated_storage_preallocated_) {
259 return FreeStoreAllocationPolicy::New(size);
260 }
261 ASSERT(free_list_.next_ != &free_list_);
262 ASSERT(free_list_.previous_ != &free_list_);
263
264 size = (size + kPointerSize - 1) & ~(kPointerSize - 1);
265 // Search for exact fit.
266 for (PreallocatedStorage* storage = free_list_.next_;
267 storage != &free_list_;
268 storage = storage->next_) {
269 if (storage->size_ == size) {
270 storage->Unlink();
271 storage->LinkTo(&in_use_list_);
272 return reinterpret_cast<void*>(storage + 1);
273 }
274 }
275 // Search for first fit.
276 for (PreallocatedStorage* storage = free_list_.next_;
277 storage != &free_list_;
278 storage = storage->next_) {
279 if (storage->size_ >= size + sizeof(PreallocatedStorage)) {
280 storage->Unlink();
281 storage->LinkTo(&in_use_list_);
282 PreallocatedStorage* left_over =
283 reinterpret_cast<PreallocatedStorage*>(
284 reinterpret_cast<char*>(storage + 1) + size);
285 left_over->size_ = storage->size_ - size - sizeof(PreallocatedStorage);
286 ASSERT(size + left_over->size_ + sizeof(PreallocatedStorage) ==
287 storage->size_);
288 storage->size_ = size;
289 left_over->LinkTo(&free_list_);
290 return reinterpret_cast<void*>(storage + 1);
291 }
292 }
293 // Allocation failure.
294 ASSERT(false);
295 return NULL;
296 }
297
298
299 // We don't attempt to coalesce.
PreallocatedStorageDelete(void * p)300 void Isolate::PreallocatedStorageDelete(void* p) {
301 if (p == NULL) {
302 return;
303 }
304 if (!preallocated_storage_preallocated_) {
305 FreeStoreAllocationPolicy::Delete(p);
306 return;
307 }
308 PreallocatedStorage* storage = reinterpret_cast<PreallocatedStorage*>(p) - 1;
309 ASSERT(storage->next_->previous_ == storage);
310 ASSERT(storage->previous_->next_ == storage);
311 storage->Unlink();
312 storage->LinkTo(&free_list_);
313 }
314
315 Isolate* Isolate::default_isolate_ = NULL;
316 Thread::LocalStorageKey Isolate::isolate_key_;
317 Thread::LocalStorageKey Isolate::thread_id_key_;
318 Thread::LocalStorageKey Isolate::per_isolate_thread_data_key_;
319 Mutex* Isolate::process_wide_mutex_ = OS::CreateMutex();
320 Isolate::ThreadDataTable* Isolate::thread_data_table_ = NULL;
321
322
AllocatePerIsolateThreadData(ThreadId thread_id)323 Isolate::PerIsolateThreadData* Isolate::AllocatePerIsolateThreadData(
324 ThreadId thread_id) {
325 ASSERT(!thread_id.Equals(ThreadId::Invalid()));
326 PerIsolateThreadData* per_thread = new PerIsolateThreadData(this, thread_id);
327 {
328 ScopedLock lock(process_wide_mutex_);
329 ASSERT(thread_data_table_->Lookup(this, thread_id) == NULL);
330 thread_data_table_->Insert(per_thread);
331 ASSERT(thread_data_table_->Lookup(this, thread_id) == per_thread);
332 }
333 return per_thread;
334 }
335
336
337 Isolate::PerIsolateThreadData*
FindOrAllocatePerThreadDataForThisThread()338 Isolate::FindOrAllocatePerThreadDataForThisThread() {
339 ThreadId thread_id = ThreadId::Current();
340 PerIsolateThreadData* per_thread = NULL;
341 {
342 ScopedLock lock(process_wide_mutex_);
343 per_thread = thread_data_table_->Lookup(this, thread_id);
344 if (per_thread == NULL) {
345 per_thread = AllocatePerIsolateThreadData(thread_id);
346 }
347 }
348 return per_thread;
349 }
350
351
FindPerThreadDataForThisThread()352 Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThisThread() {
353 ThreadId thread_id = ThreadId::Current();
354 PerIsolateThreadData* per_thread = NULL;
355 {
356 ScopedLock lock(process_wide_mutex_);
357 per_thread = thread_data_table_->Lookup(this, thread_id);
358 }
359 return per_thread;
360 }
361
362
EnsureDefaultIsolate()363 void Isolate::EnsureDefaultIsolate() {
364 ScopedLock lock(process_wide_mutex_);
365 if (default_isolate_ == NULL) {
366 isolate_key_ = Thread::CreateThreadLocalKey();
367 thread_id_key_ = Thread::CreateThreadLocalKey();
368 per_isolate_thread_data_key_ = Thread::CreateThreadLocalKey();
369 thread_data_table_ = new Isolate::ThreadDataTable();
370 default_isolate_ = new Isolate();
371 }
372 // Can't use SetIsolateThreadLocals(default_isolate_, NULL) here
373 // because a non-null thread data may be already set.
374 if (Thread::GetThreadLocal(isolate_key_) == NULL) {
375 Thread::SetThreadLocal(isolate_key_, default_isolate_);
376 }
377 }
378
379 struct StaticInitializer {
StaticInitializerv8::internal::StaticInitializer380 StaticInitializer() {
381 Isolate::EnsureDefaultIsolate();
382 }
383 } static_initializer;
384
385 #ifdef ENABLE_DEBUGGER_SUPPORT
GetDefaultIsolateDebugger()386 Debugger* Isolate::GetDefaultIsolateDebugger() {
387 EnsureDefaultIsolate();
388 return default_isolate_->debugger();
389 }
390 #endif
391
392
GetDefaultIsolateStackGuard()393 StackGuard* Isolate::GetDefaultIsolateStackGuard() {
394 EnsureDefaultIsolate();
395 return default_isolate_->stack_guard();
396 }
397
398
EnterDefaultIsolate()399 void Isolate::EnterDefaultIsolate() {
400 EnsureDefaultIsolate();
401 ASSERT(default_isolate_ != NULL);
402
403 PerIsolateThreadData* data = CurrentPerIsolateThreadData();
404 // If not yet in default isolate - enter it.
405 if (data == NULL || data->isolate() != default_isolate_) {
406 default_isolate_->Enter();
407 }
408 }
409
410
GetDefaultIsolateForLocking()411 Isolate* Isolate::GetDefaultIsolateForLocking() {
412 EnsureDefaultIsolate();
413 return default_isolate_;
414 }
415
416
get_address_from_id(Isolate::AddressId id)417 Address Isolate::get_address_from_id(Isolate::AddressId id) {
418 return isolate_addresses_[id];
419 }
420
421
Iterate(ObjectVisitor * v,char * thread_storage)422 char* Isolate::Iterate(ObjectVisitor* v, char* thread_storage) {
423 ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage);
424 Iterate(v, thread);
425 return thread_storage + sizeof(ThreadLocalTop);
426 }
427
428
IterateThread(ThreadVisitor * v)429 void Isolate::IterateThread(ThreadVisitor* v) {
430 v->VisitThread(this, thread_local_top());
431 }
432
433
IterateThread(ThreadVisitor * v,char * t)434 void Isolate::IterateThread(ThreadVisitor* v, char* t) {
435 ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(t);
436 v->VisitThread(this, thread);
437 }
438
439
Iterate(ObjectVisitor * v,ThreadLocalTop * thread)440 void Isolate::Iterate(ObjectVisitor* v, ThreadLocalTop* thread) {
441 // Visit the roots from the top for a given thread.
442 Object* pending;
443 // The pending exception can sometimes be a failure. We can't show
444 // that to the GC, which only understands objects.
445 if (thread->pending_exception_->ToObject(&pending)) {
446 v->VisitPointer(&pending);
447 thread->pending_exception_ = pending; // In case GC updated it.
448 }
449 v->VisitPointer(&(thread->pending_message_obj_));
450 v->VisitPointer(BitCast<Object**>(&(thread->pending_message_script_)));
451 v->VisitPointer(BitCast<Object**>(&(thread->context_)));
452 Object* scheduled;
453 if (thread->scheduled_exception_->ToObject(&scheduled)) {
454 v->VisitPointer(&scheduled);
455 thread->scheduled_exception_ = scheduled;
456 }
457
458 for (v8::TryCatch* block = thread->TryCatchHandler();
459 block != NULL;
460 block = TRY_CATCH_FROM_ADDRESS(block->next_)) {
461 v->VisitPointer(BitCast<Object**>(&(block->exception_)));
462 v->VisitPointer(BitCast<Object**>(&(block->message_)));
463 }
464
465 // Iterate over pointers on native execution stack.
466 for (StackFrameIterator it(this, thread); !it.done(); it.Advance()) {
467 it.frame()->Iterate(v);
468 }
469
470 // Iterate pointers in live lookup results.
471 thread->top_lookup_result_->Iterate(v);
472 }
473
474
Iterate(ObjectVisitor * v)475 void Isolate::Iterate(ObjectVisitor* v) {
476 ThreadLocalTop* current_t = thread_local_top();
477 Iterate(v, current_t);
478 }
479
480
RegisterTryCatchHandler(v8::TryCatch * that)481 void Isolate::RegisterTryCatchHandler(v8::TryCatch* that) {
482 // The ARM simulator has a separate JS stack. We therefore register
483 // the C++ try catch handler with the simulator and get back an
484 // address that can be used for comparisons with addresses into the
485 // JS stack. When running without the simulator, the address
486 // returned will be the address of the C++ try catch handler itself.
487 Address address = reinterpret_cast<Address>(
488 SimulatorStack::RegisterCTryCatch(reinterpret_cast<uintptr_t>(that)));
489 thread_local_top()->set_try_catch_handler_address(address);
490 }
491
492
UnregisterTryCatchHandler(v8::TryCatch * that)493 void Isolate::UnregisterTryCatchHandler(v8::TryCatch* that) {
494 ASSERT(thread_local_top()->TryCatchHandler() == that);
495 thread_local_top()->set_try_catch_handler_address(
496 reinterpret_cast<Address>(that->next_));
497 thread_local_top()->catcher_ = NULL;
498 SimulatorStack::UnregisterCTryCatch();
499 }
500
501
StackTraceString()502 Handle<String> Isolate::StackTraceString() {
503 if (stack_trace_nesting_level_ == 0) {
504 stack_trace_nesting_level_++;
505 HeapStringAllocator allocator;
506 StringStream::ClearMentionedObjectCache();
507 StringStream accumulator(&allocator);
508 incomplete_message_ = &accumulator;
509 PrintStack(&accumulator);
510 Handle<String> stack_trace = accumulator.ToString();
511 incomplete_message_ = NULL;
512 stack_trace_nesting_level_ = 0;
513 return stack_trace;
514 } else if (stack_trace_nesting_level_ == 1) {
515 stack_trace_nesting_level_++;
516 OS::PrintError(
517 "\n\nAttempt to print stack while printing stack (double fault)\n");
518 OS::PrintError(
519 "If you are lucky you may find a partial stack dump on stdout.\n\n");
520 incomplete_message_->OutputToStdOut();
521 return factory()->empty_symbol();
522 } else {
523 OS::Abort();
524 // Unreachable
525 return factory()->empty_symbol();
526 }
527 }
528
529
CaptureAndSetCurrentStackTraceFor(Handle<JSObject> error_object)530 void Isolate::CaptureAndSetCurrentStackTraceFor(Handle<JSObject> error_object) {
531 if (capture_stack_trace_for_uncaught_exceptions_) {
532 // Capture stack trace for a detailed exception message.
533 Handle<String> key = factory()->hidden_stack_trace_symbol();
534 Handle<JSArray> stack_trace = CaptureCurrentStackTrace(
535 stack_trace_for_uncaught_exceptions_frame_limit_,
536 stack_trace_for_uncaught_exceptions_options_);
537 JSObject::SetHiddenProperty(error_object, key, stack_trace);
538 }
539 }
540
541
CaptureCurrentStackTrace(int frame_limit,StackTrace::StackTraceOptions options)542 Handle<JSArray> Isolate::CaptureCurrentStackTrace(
543 int frame_limit, StackTrace::StackTraceOptions options) {
544 // Ensure no negative values.
545 int limit = Max(frame_limit, 0);
546 Handle<JSArray> stack_trace = factory()->NewJSArray(frame_limit);
547
548 Handle<String> column_key = factory()->LookupAsciiSymbol("column");
549 Handle<String> line_key = factory()->LookupAsciiSymbol("lineNumber");
550 Handle<String> script_key = factory()->LookupAsciiSymbol("scriptName");
551 Handle<String> name_or_source_url_key =
552 factory()->LookupAsciiSymbol("nameOrSourceURL");
553 Handle<String> script_name_or_source_url_key =
554 factory()->LookupAsciiSymbol("scriptNameOrSourceURL");
555 Handle<String> function_key = factory()->LookupAsciiSymbol("functionName");
556 Handle<String> eval_key = factory()->LookupAsciiSymbol("isEval");
557 Handle<String> constructor_key =
558 factory()->LookupAsciiSymbol("isConstructor");
559
560 StackTraceFrameIterator it(this);
561 int frames_seen = 0;
562 while (!it.done() && (frames_seen < limit)) {
563 JavaScriptFrame* frame = it.frame();
564 // Set initial size to the maximum inlining level + 1 for the outermost
565 // function.
566 List<FrameSummary> frames(Compiler::kMaxInliningLevels + 1);
567 frame->Summarize(&frames);
568 for (int i = frames.length() - 1; i >= 0 && frames_seen < limit; i--) {
569 // Create a JSObject to hold the information for the StackFrame.
570 Handle<JSObject> stack_frame = factory()->NewJSObject(object_function());
571
572 Handle<JSFunction> fun = frames[i].function();
573 Handle<Script> script(Script::cast(fun->shared()->script()));
574
575 if (options & StackTrace::kLineNumber) {
576 int script_line_offset = script->line_offset()->value();
577 int position = frames[i].code()->SourcePosition(frames[i].pc());
578 int line_number = GetScriptLineNumber(script, position);
579 // line_number is already shifted by the script_line_offset.
580 int relative_line_number = line_number - script_line_offset;
581 if (options & StackTrace::kColumnOffset && relative_line_number >= 0) {
582 Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends()));
583 int start = (relative_line_number == 0) ? 0 :
584 Smi::cast(line_ends->get(relative_line_number - 1))->value() + 1;
585 int column_offset = position - start;
586 if (relative_line_number == 0) {
587 // For the case where the code is on the same line as the script
588 // tag.
589 column_offset += script->column_offset()->value();
590 }
591 CHECK_NOT_EMPTY_HANDLE(
592 this,
593 JSObject::SetLocalPropertyIgnoreAttributes(
594 stack_frame, column_key,
595 Handle<Smi>(Smi::FromInt(column_offset + 1)), NONE));
596 }
597 CHECK_NOT_EMPTY_HANDLE(
598 this,
599 JSObject::SetLocalPropertyIgnoreAttributes(
600 stack_frame, line_key,
601 Handle<Smi>(Smi::FromInt(line_number + 1)), NONE));
602 }
603
604 if (options & StackTrace::kScriptName) {
605 Handle<Object> script_name(script->name(), this);
606 CHECK_NOT_EMPTY_HANDLE(this,
607 JSObject::SetLocalPropertyIgnoreAttributes(
608 stack_frame, script_key, script_name, NONE));
609 }
610
611 if (options & StackTrace::kScriptNameOrSourceURL) {
612 Handle<Object> script_name(script->name(), this);
613 Handle<JSValue> script_wrapper = GetScriptWrapper(script);
614 Handle<Object> property = GetProperty(script_wrapper,
615 name_or_source_url_key);
616 ASSERT(property->IsJSFunction());
617 Handle<JSFunction> method = Handle<JSFunction>::cast(property);
618 bool caught_exception;
619 Handle<Object> result = Execution::TryCall(method, script_wrapper, 0,
620 NULL, &caught_exception);
621 if (caught_exception) {
622 result = factory()->undefined_value();
623 }
624 CHECK_NOT_EMPTY_HANDLE(this,
625 JSObject::SetLocalPropertyIgnoreAttributes(
626 stack_frame, script_name_or_source_url_key,
627 result, NONE));
628 }
629
630 if (options & StackTrace::kFunctionName) {
631 Handle<Object> fun_name(fun->shared()->name(), this);
632 if (fun_name->ToBoolean()->IsFalse()) {
633 fun_name = Handle<Object>(fun->shared()->inferred_name(), this);
634 }
635 CHECK_NOT_EMPTY_HANDLE(this,
636 JSObject::SetLocalPropertyIgnoreAttributes(
637 stack_frame, function_key, fun_name, NONE));
638 }
639
640 if (options & StackTrace::kIsEval) {
641 int type = Smi::cast(script->compilation_type())->value();
642 Handle<Object> is_eval = (type == Script::COMPILATION_TYPE_EVAL) ?
643 factory()->true_value() : factory()->false_value();
644 CHECK_NOT_EMPTY_HANDLE(this,
645 JSObject::SetLocalPropertyIgnoreAttributes(
646 stack_frame, eval_key, is_eval, NONE));
647 }
648
649 if (options & StackTrace::kIsConstructor) {
650 Handle<Object> is_constructor = (frames[i].is_constructor()) ?
651 factory()->true_value() : factory()->false_value();
652 CHECK_NOT_EMPTY_HANDLE(this,
653 JSObject::SetLocalPropertyIgnoreAttributes(
654 stack_frame, constructor_key,
655 is_constructor, NONE));
656 }
657
658 FixedArray::cast(stack_trace->elements())->set(frames_seen, *stack_frame);
659 frames_seen++;
660 }
661 it.Advance();
662 }
663
664 stack_trace->set_length(Smi::FromInt(frames_seen));
665 return stack_trace;
666 }
667
668
PrintStack()669 void Isolate::PrintStack() {
670 if (stack_trace_nesting_level_ == 0) {
671 stack_trace_nesting_level_++;
672
673 StringAllocator* allocator;
674 if (preallocated_message_space_ == NULL) {
675 allocator = new HeapStringAllocator();
676 } else {
677 allocator = preallocated_message_space_;
678 }
679
680 StringStream::ClearMentionedObjectCache();
681 StringStream accumulator(allocator);
682 incomplete_message_ = &accumulator;
683 PrintStack(&accumulator);
684 accumulator.OutputToStdOut();
685 InitializeLoggingAndCounters();
686 accumulator.Log();
687 incomplete_message_ = NULL;
688 stack_trace_nesting_level_ = 0;
689 if (preallocated_message_space_ == NULL) {
690 // Remove the HeapStringAllocator created above.
691 delete allocator;
692 }
693 } else if (stack_trace_nesting_level_ == 1) {
694 stack_trace_nesting_level_++;
695 OS::PrintError(
696 "\n\nAttempt to print stack while printing stack (double fault)\n");
697 OS::PrintError(
698 "If you are lucky you may find a partial stack dump on stdout.\n\n");
699 incomplete_message_->OutputToStdOut();
700 }
701 }
702
703
PrintFrames(StringStream * accumulator,StackFrame::PrintMode mode)704 static void PrintFrames(StringStream* accumulator,
705 StackFrame::PrintMode mode) {
706 StackFrameIterator it;
707 for (int i = 0; !it.done(); it.Advance()) {
708 it.frame()->Print(accumulator, mode, i++);
709 }
710 }
711
712
PrintStack(StringStream * accumulator)713 void Isolate::PrintStack(StringStream* accumulator) {
714 if (!IsInitialized()) {
715 accumulator->Add(
716 "\n==== Stack trace is not available ==========================\n\n");
717 accumulator->Add(
718 "\n==== Isolate for the thread is not initialized =============\n\n");
719 return;
720 }
721 // The MentionedObjectCache is not GC-proof at the moment.
722 AssertNoAllocation nogc;
723 ASSERT(StringStream::IsMentionedObjectCacheClear());
724
725 // Avoid printing anything if there are no frames.
726 if (c_entry_fp(thread_local_top()) == 0) return;
727
728 accumulator->Add(
729 "\n==== Stack trace ============================================\n\n");
730 PrintFrames(accumulator, StackFrame::OVERVIEW);
731
732 accumulator->Add(
733 "\n==== Details ================================================\n\n");
734 PrintFrames(accumulator, StackFrame::DETAILS);
735
736 accumulator->PrintMentionedObjectCache();
737 accumulator->Add("=====================\n\n");
738 }
739
740
SetFailedAccessCheckCallback(v8::FailedAccessCheckCallback callback)741 void Isolate::SetFailedAccessCheckCallback(
742 v8::FailedAccessCheckCallback callback) {
743 thread_local_top()->failed_access_check_callback_ = callback;
744 }
745
746
ReportFailedAccessCheck(JSObject * receiver,v8::AccessType type)747 void Isolate::ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type) {
748 if (!thread_local_top()->failed_access_check_callback_) return;
749
750 ASSERT(receiver->IsAccessCheckNeeded());
751 ASSERT(context());
752
753 // Get the data object from access check info.
754 JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
755 if (!constructor->shared()->IsApiFunction()) return;
756 Object* data_obj =
757 constructor->shared()->get_api_func_data()->access_check_info();
758 if (data_obj == heap_.undefined_value()) return;
759
760 HandleScope scope;
761 Handle<JSObject> receiver_handle(receiver);
762 Handle<Object> data(AccessCheckInfo::cast(data_obj)->data());
763 { VMState state(this, EXTERNAL);
764 thread_local_top()->failed_access_check_callback_(
765 v8::Utils::ToLocal(receiver_handle),
766 type,
767 v8::Utils::ToLocal(data));
768 }
769 }
770
771
772 enum MayAccessDecision {
773 YES, NO, UNKNOWN
774 };
775
776
MayAccessPreCheck(Isolate * isolate,JSObject * receiver,v8::AccessType type)777 static MayAccessDecision MayAccessPreCheck(Isolate* isolate,
778 JSObject* receiver,
779 v8::AccessType type) {
780 // During bootstrapping, callback functions are not enabled yet.
781 if (isolate->bootstrapper()->IsActive()) return YES;
782
783 if (receiver->IsJSGlobalProxy()) {
784 Object* receiver_context = JSGlobalProxy::cast(receiver)->context();
785 if (!receiver_context->IsContext()) return NO;
786
787 // Get the global context of current top context.
788 // avoid using Isolate::global_context() because it uses Handle.
789 Context* global_context = isolate->context()->global()->global_context();
790 if (receiver_context == global_context) return YES;
791
792 if (Context::cast(receiver_context)->security_token() ==
793 global_context->security_token())
794 return YES;
795 }
796
797 return UNKNOWN;
798 }
799
800
MayNamedAccess(JSObject * receiver,Object * key,v8::AccessType type)801 bool Isolate::MayNamedAccess(JSObject* receiver, Object* key,
802 v8::AccessType type) {
803 ASSERT(receiver->IsAccessCheckNeeded());
804
805 // The callers of this method are not expecting a GC.
806 AssertNoAllocation no_gc;
807
808 // Skip checks for hidden properties access. Note, we do not
809 // require existence of a context in this case.
810 if (key == heap_.hidden_symbol()) return true;
811
812 // Check for compatibility between the security tokens in the
813 // current lexical context and the accessed object.
814 ASSERT(context());
815
816 MayAccessDecision decision = MayAccessPreCheck(this, receiver, type);
817 if (decision != UNKNOWN) return decision == YES;
818
819 // Get named access check callback
820 JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
821 if (!constructor->shared()->IsApiFunction()) return false;
822
823 Object* data_obj =
824 constructor->shared()->get_api_func_data()->access_check_info();
825 if (data_obj == heap_.undefined_value()) return false;
826
827 Object* fun_obj = AccessCheckInfo::cast(data_obj)->named_callback();
828 v8::NamedSecurityCallback callback =
829 v8::ToCData<v8::NamedSecurityCallback>(fun_obj);
830
831 if (!callback) return false;
832
833 HandleScope scope(this);
834 Handle<JSObject> receiver_handle(receiver, this);
835 Handle<Object> key_handle(key, this);
836 Handle<Object> data(AccessCheckInfo::cast(data_obj)->data(), this);
837 LOG(this, ApiNamedSecurityCheck(key));
838 bool result = false;
839 {
840 // Leaving JavaScript.
841 VMState state(this, EXTERNAL);
842 result = callback(v8::Utils::ToLocal(receiver_handle),
843 v8::Utils::ToLocal(key_handle),
844 type,
845 v8::Utils::ToLocal(data));
846 }
847 return result;
848 }
849
850
MayIndexedAccess(JSObject * receiver,uint32_t index,v8::AccessType type)851 bool Isolate::MayIndexedAccess(JSObject* receiver,
852 uint32_t index,
853 v8::AccessType type) {
854 ASSERT(receiver->IsAccessCheckNeeded());
855 // Check for compatibility between the security tokens in the
856 // current lexical context and the accessed object.
857 ASSERT(context());
858
859 MayAccessDecision decision = MayAccessPreCheck(this, receiver, type);
860 if (decision != UNKNOWN) return decision == YES;
861
862 // Get indexed access check callback
863 JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
864 if (!constructor->shared()->IsApiFunction()) return false;
865
866 Object* data_obj =
867 constructor->shared()->get_api_func_data()->access_check_info();
868 if (data_obj == heap_.undefined_value()) return false;
869
870 Object* fun_obj = AccessCheckInfo::cast(data_obj)->indexed_callback();
871 v8::IndexedSecurityCallback callback =
872 v8::ToCData<v8::IndexedSecurityCallback>(fun_obj);
873
874 if (!callback) return false;
875
876 HandleScope scope(this);
877 Handle<JSObject> receiver_handle(receiver, this);
878 Handle<Object> data(AccessCheckInfo::cast(data_obj)->data(), this);
879 LOG(this, ApiIndexedSecurityCheck(index));
880 bool result = false;
881 {
882 // Leaving JavaScript.
883 VMState state(this, EXTERNAL);
884 result = callback(v8::Utils::ToLocal(receiver_handle),
885 index,
886 type,
887 v8::Utils::ToLocal(data));
888 }
889 return result;
890 }
891
892
893 const char* const Isolate::kStackOverflowMessage =
894 "Uncaught RangeError: Maximum call stack size exceeded";
895
896
StackOverflow()897 Failure* Isolate::StackOverflow() {
898 HandleScope scope;
899 Handle<String> key = factory()->stack_overflow_symbol();
900 Handle<JSObject> boilerplate =
901 Handle<JSObject>::cast(GetProperty(js_builtins_object(), key));
902 Handle<Object> exception = Copy(boilerplate);
903 // TODO(1240995): To avoid having to call JavaScript code to compute
904 // the message for stack overflow exceptions which is very likely to
905 // double fault with another stack overflow exception, we use a
906 // precomputed message.
907 DoThrow(*exception, NULL);
908 return Failure::Exception();
909 }
910
911
TerminateExecution()912 Failure* Isolate::TerminateExecution() {
913 DoThrow(heap_.termination_exception(), NULL);
914 return Failure::Exception();
915 }
916
917
Throw(Object * exception,MessageLocation * location)918 Failure* Isolate::Throw(Object* exception, MessageLocation* location) {
919 DoThrow(exception, location);
920 return Failure::Exception();
921 }
922
923
ReThrow(MaybeObject * exception,MessageLocation * location)924 Failure* Isolate::ReThrow(MaybeObject* exception, MessageLocation* location) {
925 bool can_be_caught_externally = false;
926 bool catchable_by_javascript = is_catchable_by_javascript(exception);
927 ShouldReportException(&can_be_caught_externally, catchable_by_javascript);
928
929 thread_local_top()->catcher_ = can_be_caught_externally ?
930 try_catch_handler() : NULL;
931
932 // Set the exception being re-thrown.
933 set_pending_exception(exception);
934 if (exception->IsFailure()) return exception->ToFailureUnchecked();
935 return Failure::Exception();
936 }
937
938
ThrowIllegalOperation()939 Failure* Isolate::ThrowIllegalOperation() {
940 return Throw(heap_.illegal_access_symbol());
941 }
942
943
ScheduleThrow(Object * exception)944 void Isolate::ScheduleThrow(Object* exception) {
945 // When scheduling a throw we first throw the exception to get the
946 // error reporting if it is uncaught before rescheduling it.
947 Throw(exception);
948 thread_local_top()->scheduled_exception_ = pending_exception();
949 thread_local_top()->external_caught_exception_ = false;
950 clear_pending_exception();
951 }
952
953
PromoteScheduledException()954 Failure* Isolate::PromoteScheduledException() {
955 MaybeObject* thrown = scheduled_exception();
956 clear_scheduled_exception();
957 // Re-throw the exception to avoid getting repeated error reporting.
958 return ReThrow(thrown);
959 }
960
961
PrintCurrentStackTrace(FILE * out)962 void Isolate::PrintCurrentStackTrace(FILE* out) {
963 StackTraceFrameIterator it(this);
964 while (!it.done()) {
965 HandleScope scope;
966 // Find code position if recorded in relocation info.
967 JavaScriptFrame* frame = it.frame();
968 int pos = frame->LookupCode()->SourcePosition(frame->pc());
969 Handle<Object> pos_obj(Smi::FromInt(pos));
970 // Fetch function and receiver.
971 Handle<JSFunction> fun(JSFunction::cast(frame->function()));
972 Handle<Object> recv(frame->receiver());
973 // Advance to the next JavaScript frame and determine if the
974 // current frame is the top-level frame.
975 it.Advance();
976 Handle<Object> is_top_level = it.done()
977 ? factory()->true_value()
978 : factory()->false_value();
979 // Generate and print stack trace line.
980 Handle<String> line =
981 Execution::GetStackTraceLine(recv, fun, pos_obj, is_top_level);
982 if (line->length() > 0) {
983 line->PrintOn(out);
984 fprintf(out, "\n");
985 }
986 }
987 }
988
989
ComputeLocation(MessageLocation * target)990 void Isolate::ComputeLocation(MessageLocation* target) {
991 *target = MessageLocation(Handle<Script>(heap_.empty_script()), -1, -1);
992 StackTraceFrameIterator it(this);
993 if (!it.done()) {
994 JavaScriptFrame* frame = it.frame();
995 JSFunction* fun = JSFunction::cast(frame->function());
996 Object* script = fun->shared()->script();
997 if (script->IsScript() &&
998 !(Script::cast(script)->source()->IsUndefined())) {
999 int pos = frame->LookupCode()->SourcePosition(frame->pc());
1000 // Compute the location from the function and the reloc info.
1001 Handle<Script> casted_script(Script::cast(script));
1002 *target = MessageLocation(casted_script, pos, pos + 1);
1003 }
1004 }
1005 }
1006
1007
ShouldReportException(bool * can_be_caught_externally,bool catchable_by_javascript)1008 bool Isolate::ShouldReportException(bool* can_be_caught_externally,
1009 bool catchable_by_javascript) {
1010 // Find the top-most try-catch handler.
1011 StackHandler* handler =
1012 StackHandler::FromAddress(Isolate::handler(thread_local_top()));
1013 while (handler != NULL && !handler->is_catch()) {
1014 handler = handler->next();
1015 }
1016
1017 // Get the address of the external handler so we can compare the address to
1018 // determine which one is closer to the top of the stack.
1019 Address external_handler_address =
1020 thread_local_top()->try_catch_handler_address();
1021
1022 // The exception has been externally caught if and only if there is
1023 // an external handler which is on top of the top-most try-catch
1024 // handler.
1025 *can_be_caught_externally = external_handler_address != NULL &&
1026 (handler == NULL || handler->address() > external_handler_address ||
1027 !catchable_by_javascript);
1028
1029 if (*can_be_caught_externally) {
1030 // Only report the exception if the external handler is verbose.
1031 return try_catch_handler()->is_verbose_;
1032 } else {
1033 // Report the exception if it isn't caught by JavaScript code.
1034 return handler == NULL;
1035 }
1036 }
1037
1038
IsErrorObject(Handle<Object> obj)1039 bool Isolate::IsErrorObject(Handle<Object> obj) {
1040 if (!obj->IsJSObject()) return false;
1041
1042 String* error_key = *(factory()->LookupAsciiSymbol("$Error"));
1043 Object* error_constructor =
1044 js_builtins_object()->GetPropertyNoExceptionThrown(error_key);
1045
1046 for (Object* prototype = *obj; !prototype->IsNull();
1047 prototype = prototype->GetPrototype()) {
1048 if (!prototype->IsJSObject()) return false;
1049 if (JSObject::cast(prototype)->map()->constructor() == error_constructor) {
1050 return true;
1051 }
1052 }
1053 return false;
1054 }
1055
1056
DoThrow(Object * exception,MessageLocation * location)1057 void Isolate::DoThrow(Object* exception, MessageLocation* location) {
1058 ASSERT(!has_pending_exception());
1059
1060 HandleScope scope;
1061 Handle<Object> exception_handle(exception);
1062
1063 // Determine reporting and whether the exception is caught externally.
1064 bool catchable_by_javascript = is_catchable_by_javascript(exception);
1065 bool can_be_caught_externally = false;
1066 bool should_report_exception =
1067 ShouldReportException(&can_be_caught_externally, catchable_by_javascript);
1068 bool report_exception = catchable_by_javascript && should_report_exception;
1069 bool try_catch_needs_message =
1070 can_be_caught_externally && try_catch_handler()->capture_message_;
1071 bool bootstrapping = bootstrapper()->IsActive();
1072
1073 #ifdef ENABLE_DEBUGGER_SUPPORT
1074 // Notify debugger of exception.
1075 if (catchable_by_javascript) {
1076 debugger_->OnException(exception_handle, report_exception);
1077 }
1078 #endif
1079
1080 // Generate the message if required.
1081 if (report_exception || try_catch_needs_message) {
1082 MessageLocation potential_computed_location;
1083 if (location == NULL) {
1084 // If no location was specified we use a computed one instead.
1085 ComputeLocation(&potential_computed_location);
1086 location = &potential_computed_location;
1087 }
1088 // It's not safe to try to make message objects or collect stack traces
1089 // while the bootstrapper is active since the infrastructure may not have
1090 // been properly initialized.
1091 if (!bootstrapping) {
1092 Handle<String> stack_trace;
1093 if (FLAG_trace_exception) stack_trace = StackTraceString();
1094 Handle<JSArray> stack_trace_object;
1095 if (capture_stack_trace_for_uncaught_exceptions_) {
1096 if (IsErrorObject(exception_handle)) {
1097 // We fetch the stack trace that corresponds to this error object.
1098 String* key = heap()->hidden_stack_trace_symbol();
1099 Object* stack_property =
1100 JSObject::cast(*exception_handle)->GetHiddenProperty(key);
1101 // Property lookup may have failed. In this case it's probably not
1102 // a valid Error object.
1103 if (stack_property->IsJSArray()) {
1104 stack_trace_object = Handle<JSArray>(JSArray::cast(stack_property));
1105 }
1106 }
1107 if (stack_trace_object.is_null()) {
1108 // Not an error object, we capture at throw site.
1109 stack_trace_object = CaptureCurrentStackTrace(
1110 stack_trace_for_uncaught_exceptions_frame_limit_,
1111 stack_trace_for_uncaught_exceptions_options_);
1112 }
1113 }
1114 Handle<Object> message_obj = MessageHandler::MakeMessageObject(
1115 "uncaught_exception",
1116 location,
1117 HandleVector<Object>(&exception_handle, 1),
1118 stack_trace,
1119 stack_trace_object);
1120 thread_local_top()->pending_message_obj_ = *message_obj;
1121 if (location != NULL) {
1122 thread_local_top()->pending_message_script_ = *location->script();
1123 thread_local_top()->pending_message_start_pos_ = location->start_pos();
1124 thread_local_top()->pending_message_end_pos_ = location->end_pos();
1125 }
1126 } else if (location != NULL && !location->script().is_null()) {
1127 // We are bootstrapping and caught an error where the location is set
1128 // and we have a script for the location.
1129 // In this case we could have an extension (or an internal error
1130 // somewhere) and we print out the line number at which the error occured
1131 // to the console for easier debugging.
1132 int line_number = GetScriptLineNumberSafe(location->script(),
1133 location->start_pos());
1134 OS::PrintError("Extension or internal compilation error at line %d.\n",
1135 line_number);
1136 }
1137 }
1138
1139 // Save the message for reporting if the the exception remains uncaught.
1140 thread_local_top()->has_pending_message_ = report_exception;
1141
1142 // Do not forget to clean catcher_ if currently thrown exception cannot
1143 // be caught. If necessary, ReThrow will update the catcher.
1144 thread_local_top()->catcher_ = can_be_caught_externally ?
1145 try_catch_handler() : NULL;
1146
1147 set_pending_exception(*exception_handle);
1148 }
1149
1150
IsExternallyCaught()1151 bool Isolate::IsExternallyCaught() {
1152 ASSERT(has_pending_exception());
1153
1154 if ((thread_local_top()->catcher_ == NULL) ||
1155 (try_catch_handler() != thread_local_top()->catcher_)) {
1156 // When throwing the exception, we found no v8::TryCatch
1157 // which should care about this exception.
1158 return false;
1159 }
1160
1161 if (!is_catchable_by_javascript(pending_exception())) {
1162 return true;
1163 }
1164
1165 // Get the address of the external handler so we can compare the address to
1166 // determine which one is closer to the top of the stack.
1167 Address external_handler_address =
1168 thread_local_top()->try_catch_handler_address();
1169 ASSERT(external_handler_address != NULL);
1170
1171 // The exception has been externally caught if and only if there is
1172 // an external handler which is on top of the top-most try-finally
1173 // handler.
1174 // There should be no try-catch blocks as they would prohibit us from
1175 // finding external catcher in the first place (see catcher_ check above).
1176 //
1177 // Note, that finally clause would rethrow an exception unless it's
1178 // aborted by jumps in control flow like return, break, etc. and we'll
1179 // have another chances to set proper v8::TryCatch.
1180 StackHandler* handler =
1181 StackHandler::FromAddress(Isolate::handler(thread_local_top()));
1182 while (handler != NULL && handler->address() < external_handler_address) {
1183 ASSERT(!handler->is_catch());
1184 if (handler->is_finally()) return false;
1185
1186 handler = handler->next();
1187 }
1188
1189 return true;
1190 }
1191
1192
ReportPendingMessages()1193 void Isolate::ReportPendingMessages() {
1194 ASSERT(has_pending_exception());
1195 PropagatePendingExceptionToExternalTryCatch();
1196
1197 // If the pending exception is OutOfMemoryException set out_of_memory in
1198 // the global context. Note: We have to mark the global context here
1199 // since the GenerateThrowOutOfMemory stub cannot make a RuntimeCall to
1200 // set it.
1201 HandleScope scope;
1202 if (thread_local_top_.pending_exception_ == Failure::OutOfMemoryException()) {
1203 context()->mark_out_of_memory();
1204 } else if (thread_local_top_.pending_exception_ ==
1205 heap()->termination_exception()) {
1206 // Do nothing: if needed, the exception has been already propagated to
1207 // v8::TryCatch.
1208 } else {
1209 if (thread_local_top_.has_pending_message_) {
1210 thread_local_top_.has_pending_message_ = false;
1211 if (!thread_local_top_.pending_message_obj_->IsTheHole()) {
1212 HandleScope scope;
1213 Handle<Object> message_obj(thread_local_top_.pending_message_obj_);
1214 if (thread_local_top_.pending_message_script_ != NULL) {
1215 Handle<Script> script(thread_local_top_.pending_message_script_);
1216 int start_pos = thread_local_top_.pending_message_start_pos_;
1217 int end_pos = thread_local_top_.pending_message_end_pos_;
1218 MessageLocation location(script, start_pos, end_pos);
1219 MessageHandler::ReportMessage(this, &location, message_obj);
1220 } else {
1221 MessageHandler::ReportMessage(this, NULL, message_obj);
1222 }
1223 }
1224 }
1225 }
1226 clear_pending_message();
1227 }
1228
1229
TraceException(bool flag)1230 void Isolate::TraceException(bool flag) {
1231 FLAG_trace_exception = flag; // TODO(isolates): This is an unfortunate use.
1232 }
1233
1234
OptionalRescheduleException(bool is_bottom_call)1235 bool Isolate::OptionalRescheduleException(bool is_bottom_call) {
1236 ASSERT(has_pending_exception());
1237 PropagatePendingExceptionToExternalTryCatch();
1238
1239 // Always reschedule out of memory exceptions.
1240 if (!is_out_of_memory()) {
1241 bool is_termination_exception =
1242 pending_exception() == heap_.termination_exception();
1243
1244 // Do not reschedule the exception if this is the bottom call.
1245 bool clear_exception = is_bottom_call;
1246
1247 if (is_termination_exception) {
1248 if (is_bottom_call) {
1249 thread_local_top()->external_caught_exception_ = false;
1250 clear_pending_exception();
1251 return false;
1252 }
1253 } else if (thread_local_top()->external_caught_exception_) {
1254 // If the exception is externally caught, clear it if there are no
1255 // JavaScript frames on the way to the C++ frame that has the
1256 // external handler.
1257 ASSERT(thread_local_top()->try_catch_handler_address() != NULL);
1258 Address external_handler_address =
1259 thread_local_top()->try_catch_handler_address();
1260 JavaScriptFrameIterator it;
1261 if (it.done() || (it.frame()->sp() > external_handler_address)) {
1262 clear_exception = true;
1263 }
1264 }
1265
1266 // Clear the exception if needed.
1267 if (clear_exception) {
1268 thread_local_top()->external_caught_exception_ = false;
1269 clear_pending_exception();
1270 return false;
1271 }
1272 }
1273
1274 // Reschedule the exception.
1275 thread_local_top()->scheduled_exception_ = pending_exception();
1276 clear_pending_exception();
1277 return true;
1278 }
1279
1280
SetCaptureStackTraceForUncaughtExceptions(bool capture,int frame_limit,StackTrace::StackTraceOptions options)1281 void Isolate::SetCaptureStackTraceForUncaughtExceptions(
1282 bool capture,
1283 int frame_limit,
1284 StackTrace::StackTraceOptions options) {
1285 capture_stack_trace_for_uncaught_exceptions_ = capture;
1286 stack_trace_for_uncaught_exceptions_frame_limit_ = frame_limit;
1287 stack_trace_for_uncaught_exceptions_options_ = options;
1288 }
1289
1290
is_out_of_memory()1291 bool Isolate::is_out_of_memory() {
1292 if (has_pending_exception()) {
1293 MaybeObject* e = pending_exception();
1294 if (e->IsFailure() && Failure::cast(e)->IsOutOfMemoryException()) {
1295 return true;
1296 }
1297 }
1298 if (has_scheduled_exception()) {
1299 MaybeObject* e = scheduled_exception();
1300 if (e->IsFailure() && Failure::cast(e)->IsOutOfMemoryException()) {
1301 return true;
1302 }
1303 }
1304 return false;
1305 }
1306
1307
global_context()1308 Handle<Context> Isolate::global_context() {
1309 GlobalObject* global = thread_local_top()->context_->global();
1310 return Handle<Context>(global->global_context());
1311 }
1312
1313
GetCallingGlobalContext()1314 Handle<Context> Isolate::GetCallingGlobalContext() {
1315 JavaScriptFrameIterator it;
1316 #ifdef ENABLE_DEBUGGER_SUPPORT
1317 if (debug_->InDebugger()) {
1318 while (!it.done()) {
1319 JavaScriptFrame* frame = it.frame();
1320 Context* context = Context::cast(frame->context());
1321 if (context->global_context() == *debug_->debug_context()) {
1322 it.Advance();
1323 } else {
1324 break;
1325 }
1326 }
1327 }
1328 #endif // ENABLE_DEBUGGER_SUPPORT
1329 if (it.done()) return Handle<Context>::null();
1330 JavaScriptFrame* frame = it.frame();
1331 Context* context = Context::cast(frame->context());
1332 return Handle<Context>(context->global_context());
1333 }
1334
1335
ArchiveThread(char * to)1336 char* Isolate::ArchiveThread(char* to) {
1337 if (RuntimeProfiler::IsEnabled() && current_vm_state() == JS) {
1338 RuntimeProfiler::IsolateExitedJS(this);
1339 }
1340 memcpy(to, reinterpret_cast<char*>(thread_local_top()),
1341 sizeof(ThreadLocalTop));
1342 InitializeThreadLocal();
1343 clear_pending_exception();
1344 clear_pending_message();
1345 clear_scheduled_exception();
1346 return to + sizeof(ThreadLocalTop);
1347 }
1348
1349
RestoreThread(char * from)1350 char* Isolate::RestoreThread(char* from) {
1351 memcpy(reinterpret_cast<char*>(thread_local_top()), from,
1352 sizeof(ThreadLocalTop));
1353 // This might be just paranoia, but it seems to be needed in case a
1354 // thread_local_top_ is restored on a separate OS thread.
1355 #ifdef USE_SIMULATOR
1356 #ifdef V8_TARGET_ARCH_ARM
1357 thread_local_top()->simulator_ = Simulator::current(this);
1358 #elif V8_TARGET_ARCH_MIPS
1359 thread_local_top()->simulator_ = Simulator::current(this);
1360 #endif
1361 #endif
1362 if (RuntimeProfiler::IsEnabled() && current_vm_state() == JS) {
1363 RuntimeProfiler::IsolateEnteredJS(this);
1364 }
1365 ASSERT(context() == NULL || context()->IsContext());
1366 return from + sizeof(ThreadLocalTop);
1367 }
1368
1369
ThreadDataTable()1370 Isolate::ThreadDataTable::ThreadDataTable()
1371 : list_(NULL) {
1372 }
1373
1374
1375 Isolate::PerIsolateThreadData*
Lookup(Isolate * isolate,ThreadId thread_id)1376 Isolate::ThreadDataTable::Lookup(Isolate* isolate,
1377 ThreadId thread_id) {
1378 for (PerIsolateThreadData* data = list_; data != NULL; data = data->next_) {
1379 if (data->Matches(isolate, thread_id)) return data;
1380 }
1381 return NULL;
1382 }
1383
1384
Insert(Isolate::PerIsolateThreadData * data)1385 void Isolate::ThreadDataTable::Insert(Isolate::PerIsolateThreadData* data) {
1386 if (list_ != NULL) list_->prev_ = data;
1387 data->next_ = list_;
1388 list_ = data;
1389 }
1390
1391
Remove(PerIsolateThreadData * data)1392 void Isolate::ThreadDataTable::Remove(PerIsolateThreadData* data) {
1393 if (list_ == data) list_ = data->next_;
1394 if (data->next_ != NULL) data->next_->prev_ = data->prev_;
1395 if (data->prev_ != NULL) data->prev_->next_ = data->next_;
1396 delete data;
1397 }
1398
1399
Remove(Isolate * isolate,ThreadId thread_id)1400 void Isolate::ThreadDataTable::Remove(Isolate* isolate,
1401 ThreadId thread_id) {
1402 PerIsolateThreadData* data = Lookup(isolate, thread_id);
1403 if (data != NULL) {
1404 Remove(data);
1405 }
1406 }
1407
1408
RemoveAllThreads(Isolate * isolate)1409 void Isolate::ThreadDataTable::RemoveAllThreads(Isolate* isolate) {
1410 PerIsolateThreadData* data = list_;
1411 while (data != NULL) {
1412 PerIsolateThreadData* next = data->next_;
1413 if (data->isolate() == isolate) Remove(data);
1414 data = next;
1415 }
1416 }
1417
1418
1419 #ifdef DEBUG
1420 #define TRACE_ISOLATE(tag) \
1421 do { \
1422 if (FLAG_trace_isolates) { \
1423 PrintF("Isolate %p " #tag "\n", reinterpret_cast<void*>(this)); \
1424 } \
1425 } while (false)
1426 #else
1427 #define TRACE_ISOLATE(tag)
1428 #endif
1429
1430
Isolate()1431 Isolate::Isolate()
1432 : state_(UNINITIALIZED),
1433 entry_stack_(NULL),
1434 stack_trace_nesting_level_(0),
1435 incomplete_message_(NULL),
1436 preallocated_memory_thread_(NULL),
1437 preallocated_message_space_(NULL),
1438 bootstrapper_(NULL),
1439 runtime_profiler_(NULL),
1440 compilation_cache_(NULL),
1441 counters_(NULL),
1442 code_range_(NULL),
1443 // Must be initialized early to allow v8::SetResourceConstraints calls.
1444 break_access_(OS::CreateMutex()),
1445 debugger_initialized_(false),
1446 // Must be initialized early to allow v8::Debug calls.
1447 debugger_access_(OS::CreateMutex()),
1448 logger_(NULL),
1449 stats_table_(NULL),
1450 stub_cache_(NULL),
1451 deoptimizer_data_(NULL),
1452 capture_stack_trace_for_uncaught_exceptions_(false),
1453 stack_trace_for_uncaught_exceptions_frame_limit_(0),
1454 stack_trace_for_uncaught_exceptions_options_(StackTrace::kOverview),
1455 transcendental_cache_(NULL),
1456 memory_allocator_(NULL),
1457 keyed_lookup_cache_(NULL),
1458 context_slot_cache_(NULL),
1459 descriptor_lookup_cache_(NULL),
1460 handle_scope_implementer_(NULL),
1461 unicode_cache_(NULL),
1462 in_use_list_(0),
1463 free_list_(0),
1464 preallocated_storage_preallocated_(false),
1465 inner_pointer_to_code_cache_(NULL),
1466 write_input_buffer_(NULL),
1467 global_handles_(NULL),
1468 context_switcher_(NULL),
1469 thread_manager_(NULL),
1470 fp_stubs_generated_(false),
1471 has_installed_extensions_(false),
1472 string_tracker_(NULL),
1473 regexp_stack_(NULL),
1474 date_cache_(NULL),
1475 embedder_data_(NULL),
1476 context_exit_happened_(false) {
1477 TRACE_ISOLATE(constructor);
1478
1479 memset(isolate_addresses_, 0,
1480 sizeof(isolate_addresses_[0]) * (kIsolateAddressCount + 1));
1481
1482 heap_.isolate_ = this;
1483 zone_.isolate_ = this;
1484 stack_guard_.isolate_ = this;
1485
1486 // ThreadManager is initialized early to support locking an isolate
1487 // before it is entered.
1488 thread_manager_ = new ThreadManager();
1489 thread_manager_->isolate_ = this;
1490
1491 #if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
1492 defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
1493 simulator_initialized_ = false;
1494 simulator_i_cache_ = NULL;
1495 simulator_redirection_ = NULL;
1496 #endif
1497
1498 #ifdef DEBUG
1499 // heap_histograms_ initializes itself.
1500 memset(&js_spill_information_, 0, sizeof(js_spill_information_));
1501 memset(code_kind_statistics_, 0,
1502 sizeof(code_kind_statistics_[0]) * Code::NUMBER_OF_KINDS);
1503 #endif
1504
1505 #ifdef ENABLE_DEBUGGER_SUPPORT
1506 debug_ = NULL;
1507 debugger_ = NULL;
1508 #endif
1509
1510 handle_scope_data_.Initialize();
1511
1512 #define ISOLATE_INIT_EXECUTE(type, name, initial_value) \
1513 name##_ = (initial_value);
1514 ISOLATE_INIT_LIST(ISOLATE_INIT_EXECUTE)
1515 #undef ISOLATE_INIT_EXECUTE
1516
1517 #define ISOLATE_INIT_ARRAY_EXECUTE(type, name, length) \
1518 memset(name##_, 0, sizeof(type) * length);
1519 ISOLATE_INIT_ARRAY_LIST(ISOLATE_INIT_ARRAY_EXECUTE)
1520 #undef ISOLATE_INIT_ARRAY_EXECUTE
1521 }
1522
TearDown()1523 void Isolate::TearDown() {
1524 TRACE_ISOLATE(tear_down);
1525
1526 // Temporarily set this isolate as current so that various parts of
1527 // the isolate can access it in their destructors without having a
1528 // direct pointer. We don't use Enter/Exit here to avoid
1529 // initializing the thread data.
1530 PerIsolateThreadData* saved_data = CurrentPerIsolateThreadData();
1531 Isolate* saved_isolate = UncheckedCurrent();
1532 SetIsolateThreadLocals(this, NULL);
1533
1534 Deinit();
1535
1536 { ScopedLock lock(process_wide_mutex_);
1537 thread_data_table_->RemoveAllThreads(this);
1538 }
1539
1540 if (!IsDefaultIsolate()) {
1541 delete this;
1542 }
1543
1544 // Restore the previous current isolate.
1545 SetIsolateThreadLocals(saved_isolate, saved_data);
1546 }
1547
1548
Deinit()1549 void Isolate::Deinit() {
1550 if (state_ == INITIALIZED) {
1551 TRACE_ISOLATE(deinit);
1552
1553 if (FLAG_hydrogen_stats) HStatistics::Instance()->Print();
1554
1555 // We must stop the logger before we tear down other components.
1556 logger_->EnsureTickerStopped();
1557
1558 delete deoptimizer_data_;
1559 deoptimizer_data_ = NULL;
1560 if (FLAG_preemption) {
1561 v8::Locker locker;
1562 v8::Locker::StopPreemption();
1563 }
1564 builtins_.TearDown();
1565 bootstrapper_->TearDown();
1566
1567 // Remove the external reference to the preallocated stack memory.
1568 delete preallocated_message_space_;
1569 preallocated_message_space_ = NULL;
1570 PreallocatedMemoryThreadStop();
1571
1572 HeapProfiler::TearDown();
1573 CpuProfiler::TearDown();
1574 if (runtime_profiler_ != NULL) {
1575 runtime_profiler_->TearDown();
1576 delete runtime_profiler_;
1577 runtime_profiler_ = NULL;
1578 }
1579 heap_.TearDown();
1580 logger_->TearDown();
1581
1582 // The default isolate is re-initializable due to legacy API.
1583 state_ = UNINITIALIZED;
1584 }
1585 }
1586
1587
SetIsolateThreadLocals(Isolate * isolate,PerIsolateThreadData * data)1588 void Isolate::SetIsolateThreadLocals(Isolate* isolate,
1589 PerIsolateThreadData* data) {
1590 Thread::SetThreadLocal(isolate_key_, isolate);
1591 Thread::SetThreadLocal(per_isolate_thread_data_key_, data);
1592 }
1593
1594
~Isolate()1595 Isolate::~Isolate() {
1596 TRACE_ISOLATE(destructor);
1597
1598 // Has to be called while counters_ are still alive.
1599 zone_.DeleteKeptSegment();
1600
1601 delete[] assembler_spare_buffer_;
1602 assembler_spare_buffer_ = NULL;
1603
1604 delete unicode_cache_;
1605 unicode_cache_ = NULL;
1606
1607 delete date_cache_;
1608 date_cache_ = NULL;
1609
1610 delete regexp_stack_;
1611 regexp_stack_ = NULL;
1612
1613 delete descriptor_lookup_cache_;
1614 descriptor_lookup_cache_ = NULL;
1615 delete context_slot_cache_;
1616 context_slot_cache_ = NULL;
1617 delete keyed_lookup_cache_;
1618 keyed_lookup_cache_ = NULL;
1619
1620 delete transcendental_cache_;
1621 transcendental_cache_ = NULL;
1622 delete stub_cache_;
1623 stub_cache_ = NULL;
1624 delete stats_table_;
1625 stats_table_ = NULL;
1626
1627 delete logger_;
1628 logger_ = NULL;
1629
1630 delete counters_;
1631 counters_ = NULL;
1632
1633 delete handle_scope_implementer_;
1634 handle_scope_implementer_ = NULL;
1635 delete break_access_;
1636 break_access_ = NULL;
1637 delete debugger_access_;
1638 debugger_access_ = NULL;
1639
1640 delete compilation_cache_;
1641 compilation_cache_ = NULL;
1642 delete bootstrapper_;
1643 bootstrapper_ = NULL;
1644 delete inner_pointer_to_code_cache_;
1645 inner_pointer_to_code_cache_ = NULL;
1646 delete write_input_buffer_;
1647 write_input_buffer_ = NULL;
1648
1649 delete context_switcher_;
1650 context_switcher_ = NULL;
1651 delete thread_manager_;
1652 thread_manager_ = NULL;
1653
1654 delete string_tracker_;
1655 string_tracker_ = NULL;
1656
1657 delete memory_allocator_;
1658 memory_allocator_ = NULL;
1659 delete code_range_;
1660 code_range_ = NULL;
1661 delete global_handles_;
1662 global_handles_ = NULL;
1663
1664 delete external_reference_table_;
1665 external_reference_table_ = NULL;
1666
1667 #ifdef ENABLE_DEBUGGER_SUPPORT
1668 delete debugger_;
1669 debugger_ = NULL;
1670 delete debug_;
1671 debug_ = NULL;
1672 #endif
1673 }
1674
1675
InitializeThreadLocal()1676 void Isolate::InitializeThreadLocal() {
1677 thread_local_top_.isolate_ = this;
1678 thread_local_top_.Initialize();
1679 }
1680
1681
PropagatePendingExceptionToExternalTryCatch()1682 void Isolate::PropagatePendingExceptionToExternalTryCatch() {
1683 ASSERT(has_pending_exception());
1684
1685 bool external_caught = IsExternallyCaught();
1686 thread_local_top_.external_caught_exception_ = external_caught;
1687
1688 if (!external_caught) return;
1689
1690 if (thread_local_top_.pending_exception_ == Failure::OutOfMemoryException()) {
1691 // Do not propagate OOM exception: we should kill VM asap.
1692 } else if (thread_local_top_.pending_exception_ ==
1693 heap()->termination_exception()) {
1694 try_catch_handler()->can_continue_ = false;
1695 try_catch_handler()->exception_ = heap()->null_value();
1696 } else {
1697 // At this point all non-object (failure) exceptions have
1698 // been dealt with so this shouldn't fail.
1699 ASSERT(!pending_exception()->IsFailure());
1700 try_catch_handler()->can_continue_ = true;
1701 try_catch_handler()->exception_ = pending_exception();
1702 if (!thread_local_top_.pending_message_obj_->IsTheHole()) {
1703 try_catch_handler()->message_ = thread_local_top_.pending_message_obj_;
1704 }
1705 }
1706 }
1707
1708
InitializeLoggingAndCounters()1709 void Isolate::InitializeLoggingAndCounters() {
1710 if (logger_ == NULL) {
1711 logger_ = new Logger;
1712 }
1713 if (counters_ == NULL) {
1714 counters_ = new Counters;
1715 }
1716 }
1717
1718
InitializeDebugger()1719 void Isolate::InitializeDebugger() {
1720 #ifdef ENABLE_DEBUGGER_SUPPORT
1721 ScopedLock lock(debugger_access_);
1722 if (NoBarrier_Load(&debugger_initialized_)) return;
1723 InitializeLoggingAndCounters();
1724 debug_ = new Debug(this);
1725 debugger_ = new Debugger(this);
1726 Release_Store(&debugger_initialized_, true);
1727 #endif
1728 }
1729
1730
Init(Deserializer * des)1731 bool Isolate::Init(Deserializer* des) {
1732 ASSERT(state_ != INITIALIZED);
1733 ASSERT(Isolate::Current() == this);
1734 TRACE_ISOLATE(init);
1735
1736 #ifdef DEBUG
1737 // The initialization process does not handle memory exhaustion.
1738 DisallowAllocationFailure disallow_allocation_failure;
1739 #endif
1740
1741 InitializeLoggingAndCounters();
1742
1743 InitializeDebugger();
1744
1745 memory_allocator_ = new MemoryAllocator(this);
1746 code_range_ = new CodeRange(this);
1747
1748 // Safe after setting Heap::isolate_, initializing StackGuard and
1749 // ensuring that Isolate::Current() == this.
1750 heap_.SetStackLimits();
1751
1752 #define ASSIGN_ELEMENT(CamelName, hacker_name) \
1753 isolate_addresses_[Isolate::k##CamelName##Address] = \
1754 reinterpret_cast<Address>(hacker_name##_address());
1755 FOR_EACH_ISOLATE_ADDRESS_NAME(ASSIGN_ELEMENT)
1756 #undef C
1757
1758 string_tracker_ = new StringTracker();
1759 string_tracker_->isolate_ = this;
1760 compilation_cache_ = new CompilationCache(this);
1761 transcendental_cache_ = new TranscendentalCache();
1762 keyed_lookup_cache_ = new KeyedLookupCache();
1763 context_slot_cache_ = new ContextSlotCache();
1764 descriptor_lookup_cache_ = new DescriptorLookupCache();
1765 unicode_cache_ = new UnicodeCache();
1766 inner_pointer_to_code_cache_ = new InnerPointerToCodeCache(this);
1767 write_input_buffer_ = new StringInputBuffer();
1768 global_handles_ = new GlobalHandles(this);
1769 bootstrapper_ = new Bootstrapper();
1770 handle_scope_implementer_ = new HandleScopeImplementer(this);
1771 stub_cache_ = new StubCache(this);
1772 regexp_stack_ = new RegExpStack();
1773 regexp_stack_->isolate_ = this;
1774 date_cache_ = new DateCache();
1775
1776 // Enable logging before setting up the heap
1777 logger_->SetUp();
1778
1779 CpuProfiler::SetUp();
1780 HeapProfiler::SetUp();
1781
1782 // Initialize other runtime facilities
1783 #if defined(USE_SIMULATOR)
1784 #if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
1785 Simulator::Initialize(this);
1786 #endif
1787 #endif
1788
1789 { // NOLINT
1790 // Ensure that the thread has a valid stack guard. The v8::Locker object
1791 // will ensure this too, but we don't have to use lockers if we are only
1792 // using one thread.
1793 ExecutionAccess lock(this);
1794 stack_guard_.InitThread(lock);
1795 }
1796
1797 // SetUp the object heap.
1798 const bool create_heap_objects = (des == NULL);
1799 ASSERT(!heap_.HasBeenSetUp());
1800 if (!heap_.SetUp(create_heap_objects)) {
1801 V8::SetFatalError();
1802 return false;
1803 }
1804
1805 InitializeThreadLocal();
1806
1807 bootstrapper_->Initialize(create_heap_objects);
1808 builtins_.SetUp(create_heap_objects);
1809
1810 // Only preallocate on the first initialization.
1811 if (FLAG_preallocate_message_memory && preallocated_message_space_ == NULL) {
1812 // Start the thread which will set aside some memory.
1813 PreallocatedMemoryThreadStart();
1814 preallocated_message_space_ =
1815 new NoAllocationStringAllocator(
1816 preallocated_memory_thread_->data(),
1817 preallocated_memory_thread_->length());
1818 PreallocatedStorageInit(preallocated_memory_thread_->length() / 4);
1819 }
1820
1821 if (FLAG_preemption) {
1822 v8::Locker locker;
1823 v8::Locker::StartPreemption(100);
1824 }
1825
1826 #ifdef ENABLE_DEBUGGER_SUPPORT
1827 debug_->SetUp(create_heap_objects);
1828 #endif
1829
1830 // If we are deserializing, read the state into the now-empty heap.
1831 if (des != NULL) {
1832 des->Deserialize();
1833 }
1834 stub_cache_->Initialize();
1835
1836 // Finish initialization of ThreadLocal after deserialization is done.
1837 clear_pending_exception();
1838 clear_pending_message();
1839 clear_scheduled_exception();
1840
1841 // Deserializing may put strange things in the root array's copy of the
1842 // stack guard.
1843 heap_.SetStackLimits();
1844
1845 // Quiet the heap NaN if needed on target platform.
1846 if (des != NULL) Assembler::QuietNaN(heap_.nan_value());
1847
1848 deoptimizer_data_ = new DeoptimizerData;
1849 runtime_profiler_ = new RuntimeProfiler(this);
1850 runtime_profiler_->SetUp();
1851
1852 // If we are deserializing, log non-function code objects and compiled
1853 // functions found in the snapshot.
1854 if (des != NULL && (FLAG_log_code || FLAG_ll_prof)) {
1855 HandleScope scope;
1856 LOG(this, LogCodeObjects());
1857 LOG(this, LogCompiledFunctions());
1858 }
1859
1860 state_ = INITIALIZED;
1861 time_millis_at_init_ = OS::TimeCurrentMillis();
1862 return true;
1863 }
1864
1865
1866 // Initialized lazily to allow early
1867 // v8::V8::SetAddHistogramSampleFunction calls.
stats_table()1868 StatsTable* Isolate::stats_table() {
1869 if (stats_table_ == NULL) {
1870 stats_table_ = new StatsTable;
1871 }
1872 return stats_table_;
1873 }
1874
1875
Enter()1876 void Isolate::Enter() {
1877 Isolate* current_isolate = NULL;
1878 PerIsolateThreadData* current_data = CurrentPerIsolateThreadData();
1879 if (current_data != NULL) {
1880 current_isolate = current_data->isolate_;
1881 ASSERT(current_isolate != NULL);
1882 if (current_isolate == this) {
1883 ASSERT(Current() == this);
1884 ASSERT(entry_stack_ != NULL);
1885 ASSERT(entry_stack_->previous_thread_data == NULL ||
1886 entry_stack_->previous_thread_data->thread_id().Equals(
1887 ThreadId::Current()));
1888 // Same thread re-enters the isolate, no need to re-init anything.
1889 entry_stack_->entry_count++;
1890 return;
1891 }
1892 }
1893
1894 // Threads can have default isolate set into TLS as Current but not yet have
1895 // PerIsolateThreadData for it, as it requires more advanced phase of the
1896 // initialization. For example, a thread might be the one that system used for
1897 // static initializers - in this case the default isolate is set in TLS but
1898 // the thread did not yet Enter the isolate. If PerisolateThreadData is not
1899 // there, use the isolate set in TLS.
1900 if (current_isolate == NULL) {
1901 current_isolate = Isolate::UncheckedCurrent();
1902 }
1903
1904 PerIsolateThreadData* data = FindOrAllocatePerThreadDataForThisThread();
1905 ASSERT(data != NULL);
1906 ASSERT(data->isolate_ == this);
1907
1908 EntryStackItem* item = new EntryStackItem(current_data,
1909 current_isolate,
1910 entry_stack_);
1911 entry_stack_ = item;
1912
1913 SetIsolateThreadLocals(this, data);
1914
1915 // In case it's the first time some thread enters the isolate.
1916 set_thread_id(data->thread_id());
1917 }
1918
1919
Exit()1920 void Isolate::Exit() {
1921 ASSERT(entry_stack_ != NULL);
1922 ASSERT(entry_stack_->previous_thread_data == NULL ||
1923 entry_stack_->previous_thread_data->thread_id().Equals(
1924 ThreadId::Current()));
1925
1926 if (--entry_stack_->entry_count > 0) return;
1927
1928 ASSERT(CurrentPerIsolateThreadData() != NULL);
1929 ASSERT(CurrentPerIsolateThreadData()->isolate_ == this);
1930
1931 // Pop the stack.
1932 EntryStackItem* item = entry_stack_;
1933 entry_stack_ = item->previous_item;
1934
1935 PerIsolateThreadData* previous_thread_data = item->previous_thread_data;
1936 Isolate* previous_isolate = item->previous_isolate;
1937
1938 delete item;
1939
1940 // Reinit the current thread for the isolate it was running before this one.
1941 SetIsolateThreadLocals(previous_isolate, previous_thread_data);
1942 }
1943
1944
1945 #ifdef DEBUG
1946 #define ISOLATE_FIELD_OFFSET(type, name, ignored) \
1947 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
1948 ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
1949 ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
1950 #undef ISOLATE_FIELD_OFFSET
1951 #endif
1952
1953 } } // namespace v8::internal
1954