Line data Source code
1 : // Copyright 2012 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #include "src/isolate.h"
6 :
7 : #include <stdlib.h>
8 :
9 : #include <atomic>
10 : #include <fstream> // NOLINT(readability/streams)
11 : #include <memory>
12 : #include <sstream>
13 : #include <unordered_map>
14 :
15 : #include "src/api-inl.h"
16 : #include "src/assembler-inl.h"
17 : #include "src/ast/ast-value-factory.h"
18 : #include "src/ast/scopes.h"
19 : #include "src/base/adapters.h"
20 : #include "src/base/hashmap.h"
21 : #include "src/base/platform/platform.h"
22 : #include "src/base/sys-info.h"
23 : #include "src/base/utils/random-number-generator.h"
24 : #include "src/bootstrapper.h"
25 : #include "src/builtins/builtins-promise.h"
26 : #include "src/builtins/constants-table-builder.h"
27 : #include "src/cancelable-task.h"
28 : #include "src/compilation-cache.h"
29 : #include "src/compilation-statistics.h"
30 : #include "src/compiler-dispatcher/compiler-dispatcher.h"
31 : #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
32 : #include "src/date.h"
33 : #include "src/debug/debug-frames.h"
34 : #include "src/debug/debug.h"
35 : #include "src/deoptimizer.h"
36 : #include "src/elements.h"
37 : #include "src/frames-inl.h"
38 : #include "src/hash-seed-inl.h"
39 : #include "src/heap/heap-inl.h"
40 : #include "src/heap/read-only-heap.h"
41 : #include "src/ic/stub-cache.h"
42 : #include "src/interpreter/interpreter.h"
43 : #include "src/isolate-inl.h"
44 : #include "src/libsampler/sampler.h"
45 : #include "src/log.h"
46 : #include "src/messages.h"
47 : #include "src/microtask-queue.h"
48 : #include "src/objects/frame-array-inl.h"
49 : #include "src/objects/hash-table-inl.h"
50 : #include "src/objects/js-array-inl.h"
51 : #include "src/objects/js-generator-inl.h"
52 : #include "src/objects/module-inl.h"
53 : #include "src/objects/promise-inl.h"
54 : #include "src/objects/slots.h"
55 : #include "src/objects/smi.h"
56 : #include "src/objects/stack-frame-info-inl.h"
57 : #include "src/ostreams.h"
58 : #include "src/profiler/heap-profiler.h"
59 : #include "src/profiler/tracing-cpu-profiler.h"
60 : #include "src/prototype.h"
61 : #include "src/ptr-compr.h"
62 : #include "src/regexp/regexp-stack.h"
63 : #include "src/runtime-profiler.h"
64 : #include "src/setup-isolate.h"
65 : #include "src/simulator.h"
66 : #include "src/snapshot/embedded-data.h"
67 : #include "src/snapshot/embedded-file-writer.h"
68 : #include "src/snapshot/read-only-deserializer.h"
69 : #include "src/snapshot/startup-deserializer.h"
70 : #include "src/string-builder-inl.h"
71 : #include "src/string-stream.h"
72 : #include "src/tracing/tracing-category-observer.h"
73 : #include "src/trap-handler/trap-handler.h"
74 : #include "src/unicode-cache.h"
75 : #include "src/v8.h"
76 : #include "src/v8threads.h"
77 : #include "src/version.h"
78 : #include "src/visitors.h"
79 : #include "src/vm-state-inl.h"
80 : #include "src/wasm/wasm-code-manager.h"
81 : #include "src/wasm/wasm-engine.h"
82 : #include "src/wasm/wasm-objects.h"
83 : #include "src/zone/accounting-allocator.h"
84 : #ifdef V8_INTL_SUPPORT
85 : #include "unicode/uobject.h"
86 : #endif // V8_INTL_SUPPORT
87 :
88 : extern "C" const uint8_t* v8_Default_embedded_blob_;
89 : extern "C" uint32_t v8_Default_embedded_blob_size_;
90 :
91 : namespace v8 {
92 : namespace internal {
93 :
94 : #ifdef DEBUG
95 : #define TRACE_ISOLATE(tag) \
96 : do { \
97 : if (FLAG_trace_isolates) { \
98 : PrintF("Isolate %p (id %d)" #tag "\n", reinterpret_cast<void*>(this), \
99 : id()); \
100 : } \
101 : } while (false)
102 : #else
103 : #define TRACE_ISOLATE(tag)
104 : #endif
105 :
106 61534 : const uint8_t* DefaultEmbeddedBlob() { return v8_Default_embedded_blob_; }
107 61534 : uint32_t DefaultEmbeddedBlobSize() { return v8_Default_embedded_blob_size_; }
108 :
109 : #ifdef V8_MULTI_SNAPSHOTS
110 : extern "C" const uint8_t* v8_Trusted_embedded_blob_;
111 : extern "C" uint32_t v8_Trusted_embedded_blob_size_;
112 :
113 : const uint8_t* TrustedEmbeddedBlob() { return v8_Trusted_embedded_blob_; }
114 : uint32_t TrustedEmbeddedBlobSize() { return v8_Trusted_embedded_blob_size_; }
115 : #endif
116 :
117 : namespace {
118 : // These variables provide access to the current embedded blob without requiring
119 : // an isolate instance. This is needed e.g. by Code::InstructionStart, which may
120 : // not have access to an isolate but still needs to access the embedded blob.
121 : // The variables are initialized by each isolate in Init(). Writes and reads are
122 : // relaxed since we can guarantee that the current thread has initialized these
123 : // variables before accessing them. Different threads may race, but this is fine
124 : // since they all attempt to set the same values of the blob pointer and size.
125 :
126 : std::atomic<const uint8_t*> current_embedded_blob_(nullptr);
127 : std::atomic<uint32_t> current_embedded_blob_size_(0);
128 :
129 : // The various workflows around embedded snapshots are fairly complex. We need
130 : // to support plain old snapshot builds, nosnap builds, and the requirements of
131 : // subtly different serialization tests. There's two related knobs to twiddle:
132 : //
133 : // - The default embedded blob may be overridden by setting the sticky embedded
134 : // blob. This is set automatically whenever we create a new embedded blob.
135 : //
136 : // - Lifecycle management can be either manual or set to refcounting.
137 : //
138 : // A few situations to demonstrate their use:
139 : //
140 : // - A plain old snapshot build neither overrides the default blob nor
141 : // refcounts.
142 : //
143 : // - mksnapshot sets the sticky blob and manually frees the embedded
144 : // blob once done.
145 : //
146 : // - Most serializer tests do the same.
147 : //
148 : // - Nosnapshot builds set the sticky blob and enable refcounting.
149 :
150 : // This mutex protects access to the following variables:
151 : // - sticky_embedded_blob_
152 : // - sticky_embedded_blob_size_
153 : // - enable_embedded_blob_refcounting_
154 : // - current_embedded_blob_refs_
155 : base::LazyMutex current_embedded_blob_refcount_mutex_ = LAZY_MUTEX_INITIALIZER;
156 :
157 : const uint8_t* sticky_embedded_blob_ = nullptr;
158 : uint32_t sticky_embedded_blob_size_ = 0;
159 :
160 : bool enable_embedded_blob_refcounting_ = true;
161 : int current_embedded_blob_refs_ = 0;
162 :
163 124571 : const uint8_t* StickyEmbeddedBlob() { return sticky_embedded_blob_; }
164 55 : uint32_t StickyEmbeddedBlobSize() { return sticky_embedded_blob_size_; }
165 :
166 : void SetStickyEmbeddedBlob(const uint8_t* blob, uint32_t blob_size) {
167 56 : sticky_embedded_blob_ = blob;
168 56 : sticky_embedded_blob_size_ = blob_size;
169 : }
170 :
171 : } // namespace
172 :
173 1356 : void DisableEmbeddedBlobRefcounting() {
174 : base::MutexGuard guard(current_embedded_blob_refcount_mutex_.Pointer());
175 1356 : enable_embedded_blob_refcounting_ = false;
176 1356 : }
177 :
178 1351 : void FreeCurrentEmbeddedBlob() {
179 1351 : CHECK(!enable_embedded_blob_refcounting_);
180 : base::MutexGuard guard(current_embedded_blob_refcount_mutex_.Pointer());
181 :
182 1351 : if (StickyEmbeddedBlob() == nullptr) return;
183 :
184 56 : CHECK_EQ(StickyEmbeddedBlob(), Isolate::CurrentEmbeddedBlob());
185 :
186 : InstructionStream::FreeOffHeapInstructionStream(
187 : const_cast<uint8_t*>(Isolate::CurrentEmbeddedBlob()),
188 56 : Isolate::CurrentEmbeddedBlobSize());
189 :
190 : current_embedded_blob_.store(nullptr, std::memory_order_relaxed);
191 : current_embedded_blob_size_.store(0, std::memory_order_relaxed);
192 56 : sticky_embedded_blob_ = nullptr;
193 56 : sticky_embedded_blob_size_ = 0;
194 : }
195 :
196 : // static
197 0 : bool Isolate::CurrentEmbeddedBlobIsBinaryEmbedded() {
198 : // In some situations, we must be able to rely on the embedded blob being
199 : // immortal immovable. This is the case if the blob is binary-embedded.
200 : // See blob lifecycle controls above for descriptions of when the current
201 : // embedded blob may change (e.g. in tests or mksnapshot). If the blob is
202 : // binary-embedded, it is immortal immovable.
203 : const uint8_t* blob =
204 : current_embedded_blob_.load(std::memory_order::memory_order_relaxed);
205 0 : if (blob == nullptr) return false;
206 : #ifdef V8_MULTI_SNAPSHOTS
207 : if (blob == TrustedEmbeddedBlob()) return true;
208 : #endif
209 0 : return blob == DefaultEmbeddedBlob();
210 : }
211 :
212 61589 : void Isolate::SetEmbeddedBlob(const uint8_t* blob, uint32_t blob_size) {
213 61589 : CHECK_NOT_NULL(blob);
214 :
215 61589 : embedded_blob_ = blob;
216 61589 : embedded_blob_size_ = blob_size;
217 : current_embedded_blob_.store(blob, std::memory_order_relaxed);
218 : current_embedded_blob_size_.store(blob_size, std::memory_order_relaxed);
219 :
220 : #ifdef DEBUG
221 : // Verify that the contents of the embedded blob are unchanged from
222 : // serialization-time, just to ensure the compiler isn't messing with us.
223 : EmbeddedData d = EmbeddedData::FromBlob();
224 : if (d.EmbeddedBlobHash() != d.CreateEmbeddedBlobHash()) {
225 : FATAL(
226 : "Embedded blob checksum verification failed. This indicates that the "
227 : "embedded blob has been modified since compilation time. A common "
228 : "cause is a debugging breakpoint set within builtin code.");
229 : }
230 : #endif // DEBUG
231 61589 : }
232 :
233 0 : void Isolate::ClearEmbeddedBlob() {
234 0 : CHECK(enable_embedded_blob_refcounting_);
235 0 : CHECK_EQ(embedded_blob_, CurrentEmbeddedBlob());
236 0 : CHECK_EQ(embedded_blob_, StickyEmbeddedBlob());
237 :
238 0 : embedded_blob_ = nullptr;
239 0 : embedded_blob_size_ = 0;
240 : current_embedded_blob_.store(nullptr, std::memory_order_relaxed);
241 : current_embedded_blob_size_.store(0, std::memory_order_relaxed);
242 0 : sticky_embedded_blob_ = nullptr;
243 0 : sticky_embedded_blob_size_ = 0;
244 0 : }
245 :
246 197576147 : const uint8_t* Isolate::embedded_blob() const { return embedded_blob_; }
247 92658618 : uint32_t Isolate::embedded_blob_size() const { return embedded_blob_size_; }
248 :
249 : // static
250 408265126 : const uint8_t* Isolate::CurrentEmbeddedBlob() {
251 408265126 : return current_embedded_blob_.load(std::memory_order::memory_order_relaxed);
252 : }
253 :
254 : // static
255 255800505 : uint32_t Isolate::CurrentEmbeddedBlobSize() {
256 : return current_embedded_blob_size_.load(
257 255800505 : std::memory_order::memory_order_relaxed);
258 : }
259 :
260 56 : size_t Isolate::HashIsolateForEmbeddedBlob() {
261 : DCHECK(builtins_.is_initialized());
262 : DCHECK(FLAG_embedded_builtins);
263 : DCHECK(Builtins::AllBuiltinsAreIsolateIndependent());
264 :
265 : DisallowHeapAllocation no_gc;
266 :
267 : static constexpr size_t kSeed = 0;
268 : size_t hash = kSeed;
269 :
270 : // Hash data sections of builtin code objects.
271 169736 : for (int i = 0; i < Builtins::builtin_count; i++) {
272 84840 : Code code = heap_.builtin(i);
273 :
274 : DCHECK(Internals::HasHeapObjectTag(code.ptr()));
275 : uint8_t* const code_ptr =
276 84840 : reinterpret_cast<uint8_t*>(code.ptr() - kHeapObjectTag);
277 :
278 : // These static asserts ensure we don't miss relevant fields. We don't hash
279 : // instruction size and flags since they change when creating the off-heap
280 : // trampolines. Other data fields must remain the same.
281 : STATIC_ASSERT(Code::kInstructionSizeOffset == Code::kDataStart);
282 : STATIC_ASSERT(Code::kFlagsOffset == Code::kInstructionSizeOffsetEnd + 1);
283 : STATIC_ASSERT(Code::kSafepointTableOffsetOffset ==
284 : Code::kFlagsOffsetEnd + 1);
285 : static constexpr int kStartOffset = Code::kSafepointTableOffsetOffset;
286 :
287 2799720 : for (int j = kStartOffset; j < Code::kUnalignedHeaderSize; j++) {
288 1357440 : hash = base::hash_combine(hash, size_t{code_ptr[j]});
289 : }
290 : }
291 :
292 : // The builtins constants table is also tightly tied to embedded builtins.
293 56 : hash = base::hash_combine(
294 112 : hash, static_cast<size_t>(heap_.builtins_constants_table()->length()));
295 :
296 56 : return hash;
297 : }
298 :
299 :
300 : base::Thread::LocalStorageKey Isolate::isolate_key_;
301 : base::Thread::LocalStorageKey Isolate::per_isolate_thread_data_key_;
302 : #if DEBUG
303 : std::atomic<bool> Isolate::isolate_key_created_{false};
304 : #endif
305 :
306 : namespace {
307 : // A global counter for all generated Isolates, might overflow.
308 : std::atomic<int> isolate_counter{0};
309 : } // namespace
310 :
311 : Isolate::PerIsolateThreadData*
312 325554 : Isolate::FindOrAllocatePerThreadDataForThisThread() {
313 : ThreadId thread_id = ThreadId::Current();
314 : PerIsolateThreadData* per_thread = nullptr;
315 : {
316 325549 : base::MutexGuard lock_guard(&thread_data_table_mutex_);
317 : per_thread = thread_data_table_.Lookup(thread_id);
318 325562 : if (per_thread == nullptr) {
319 67069 : per_thread = new PerIsolateThreadData(this, thread_id);
320 67069 : thread_data_table_.Insert(per_thread);
321 : }
322 : DCHECK(thread_data_table_.Lookup(thread_id) == per_thread);
323 : }
324 325567 : return per_thread;
325 : }
326 :
327 :
328 1500 : void Isolate::DiscardPerThreadDataForThisThread() {
329 1500 : ThreadId thread_id = ThreadId::TryGetCurrent();
330 1500 : if (thread_id.IsValid()) {
331 : DCHECK_NE(thread_manager_->mutex_owner_.load(std::memory_order_relaxed),
332 : thread_id);
333 1000 : base::MutexGuard lock_guard(&thread_data_table_mutex_);
334 : PerIsolateThreadData* per_thread = thread_data_table_.Lookup(thread_id);
335 1000 : if (per_thread) {
336 : DCHECK(!per_thread->thread_state_);
337 : thread_data_table_.Remove(per_thread);
338 : }
339 : }
340 1500 : }
341 :
342 :
343 40303 : Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThisThread() {
344 40303 : ThreadId thread_id = ThreadId::Current();
345 40303 : return FindPerThreadDataForThread(thread_id);
346 : }
347 :
348 :
349 40303 : Isolate::PerIsolateThreadData* Isolate::FindPerThreadDataForThread(
350 : ThreadId thread_id) {
351 : PerIsolateThreadData* per_thread = nullptr;
352 : {
353 40303 : base::MutexGuard lock_guard(&thread_data_table_mutex_);
354 : per_thread = thread_data_table_.Lookup(thread_id);
355 : }
356 40303 : return per_thread;
357 : }
358 :
359 :
360 60098 : void Isolate::InitializeOncePerProcess() {
361 60098 : isolate_key_ = base::Thread::CreateThreadLocalKey();
362 : #if DEBUG
363 : bool expected = false;
364 : DCHECK_EQ(true, isolate_key_created_.compare_exchange_strong(
365 : expected, true, std::memory_order_relaxed));
366 : #endif
367 60098 : per_isolate_thread_data_key_ = base::Thread::CreateThreadLocalKey();
368 60098 : }
369 :
370 789828 : Address Isolate::get_address_from_id(IsolateAddressId id) {
371 789828 : return isolate_addresses_[id];
372 : }
373 :
374 5546 : char* Isolate::Iterate(RootVisitor* v, char* thread_storage) {
375 : ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage);
376 5546 : Iterate(v, thread);
377 5546 : return thread_storage + sizeof(ThreadLocalTop);
378 : }
379 :
380 :
381 84083 : void Isolate::IterateThread(ThreadVisitor* v, char* t) {
382 : ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(t);
383 84083 : v->VisitThread(this, thread);
384 84083 : }
385 :
386 282434 : void Isolate::Iterate(RootVisitor* v, ThreadLocalTop* thread) {
387 : // Visit the roots from the top for a given thread.
388 282434 : v->VisitRootPointer(Root::kTop, nullptr,
389 564868 : FullObjectSlot(&thread->pending_exception_));
390 282434 : v->VisitRootPointer(Root::kTop, nullptr,
391 564868 : FullObjectSlot(&thread->pending_message_obj_));
392 564868 : v->VisitRootPointer(Root::kTop, nullptr, FullObjectSlot(&thread->context_));
393 282434 : v->VisitRootPointer(Root::kTop, nullptr,
394 564868 : FullObjectSlot(&thread->scheduled_exception_));
395 :
396 450002 : for (v8::TryCatch* block = thread->try_catch_handler_; block != nullptr;
397 : block = block->next_) {
398 : // TODO(3770): Make TryCatch::exception_ an Address (and message_obj_ too).
399 335136 : v->VisitRootPointer(
400 : Root::kTop, nullptr,
401 335136 : FullObjectSlot(reinterpret_cast<Address>(&(block->exception_))));
402 335136 : v->VisitRootPointer(
403 : Root::kTop, nullptr,
404 335136 : FullObjectSlot(reinterpret_cast<Address>(&(block->message_obj_))));
405 : }
406 :
407 : // Iterate over pointers on native execution stack.
408 3464368 : for (StackFrameIterator it(this, thread); !it.done(); it.Advance()) {
409 3181934 : it.frame()->Iterate(v);
410 : }
411 282434 : }
412 :
413 276888 : void Isolate::Iterate(RootVisitor* v) {
414 : ThreadLocalTop* current_t = thread_local_top();
415 276888 : Iterate(v, current_t);
416 276888 : }
417 :
418 276888 : void Isolate::IterateDeferredHandles(RootVisitor* visitor) {
419 280001 : for (DeferredHandles* deferred = deferred_handles_head_; deferred != nullptr;
420 : deferred = deferred->next_) {
421 3113 : deferred->Iterate(visitor);
422 : }
423 276888 : }
424 :
425 :
426 : #ifdef DEBUG
427 : bool Isolate::IsDeferredHandle(Address* handle) {
428 : // Comparing unrelated pointers (not from the same array) is undefined
429 : // behavior, so cast to Address before making arbitrary comparisons.
430 : Address handle_as_address = reinterpret_cast<Address>(handle);
431 : // Each DeferredHandles instance keeps the handles to one job in the
432 : // concurrent recompilation queue, containing a list of blocks. Each block
433 : // contains kHandleBlockSize handles except for the first block, which may
434 : // not be fully filled.
435 : // We iterate through all the blocks to see whether the argument handle
436 : // belongs to one of the blocks. If so, it is deferred.
437 : for (DeferredHandles* deferred = deferred_handles_head_; deferred != nullptr;
438 : deferred = deferred->next_) {
439 : std::vector<Address*>* blocks = &deferred->blocks_;
440 : for (size_t i = 0; i < blocks->size(); i++) {
441 : Address* block_limit = (i == 0) ? deferred->first_block_limit_
442 : : blocks->at(i) + kHandleBlockSize;
443 : if (reinterpret_cast<Address>(blocks->at(i)) <= handle_as_address &&
444 : handle_as_address < reinterpret_cast<Address>(block_limit)) {
445 : return true;
446 : }
447 : }
448 : }
449 : return false;
450 : }
451 : #endif // DEBUG
452 :
453 :
454 20992758 : void Isolate::RegisterTryCatchHandler(v8::TryCatch* that) {
455 20992758 : thread_local_top()->try_catch_handler_ = that;
456 20992758 : }
457 :
458 :
459 20992762 : void Isolate::UnregisterTryCatchHandler(v8::TryCatch* that) {
460 : DCHECK(thread_local_top()->try_catch_handler_ == that);
461 20992762 : thread_local_top()->try_catch_handler_ = that->next_;
462 20992762 : }
463 :
464 :
465 0 : Handle<String> Isolate::StackTraceString() {
466 0 : if (stack_trace_nesting_level_ == 0) {
467 0 : stack_trace_nesting_level_++;
468 : HeapStringAllocator allocator;
469 0 : StringStream::ClearMentionedObjectCache(this);
470 : StringStream accumulator(&allocator);
471 0 : incomplete_message_ = &accumulator;
472 0 : PrintStack(&accumulator);
473 0 : Handle<String> stack_trace = accumulator.ToString(this);
474 0 : incomplete_message_ = nullptr;
475 0 : stack_trace_nesting_level_ = 0;
476 0 : return stack_trace;
477 0 : } else if (stack_trace_nesting_level_ == 1) {
478 0 : stack_trace_nesting_level_++;
479 : base::OS::PrintError(
480 0 : "\n\nAttempt to print stack while printing stack (double fault)\n");
481 : base::OS::PrintError(
482 0 : "If you are lucky you may find a partial stack dump on stdout.\n\n");
483 0 : incomplete_message_->OutputToStdOut();
484 : return factory()->empty_string();
485 : } else {
486 0 : base::OS::Abort();
487 : // Unreachable
488 : return factory()->empty_string();
489 : }
490 : }
491 :
492 0 : void Isolate::PushStackTraceAndDie(void* ptr1, void* ptr2, void* ptr3,
493 : void* ptr4) {
494 0 : StackTraceFailureMessage message(this, ptr1, ptr2, ptr3, ptr4);
495 0 : message.Print();
496 0 : base::OS::Abort();
497 : }
498 :
499 0 : void StackTraceFailureMessage::Print() volatile {
500 : // Print the details of this failure message object, including its own address
501 : // to force stack allocation.
502 0 : base::OS::PrintError(
503 : "Stacktrace:\n ptr1=%p\n ptr2=%p\n ptr3=%p\n ptr4=%p\n "
504 : "failure_message_object=%p\n%s",
505 0 : ptr1_, ptr2_, ptr3_, ptr4_, this, &js_stack_trace_[0]);
506 0 : }
507 :
508 0 : StackTraceFailureMessage::StackTraceFailureMessage(Isolate* isolate, void* ptr1,
509 : void* ptr2, void* ptr3,
510 0 : void* ptr4) {
511 0 : isolate_ = isolate;
512 0 : ptr1_ = ptr1;
513 0 : ptr2_ = ptr2;
514 0 : ptr3_ = ptr3;
515 0 : ptr4_ = ptr4;
516 : // Write a stracktrace into the {js_stack_trace_} buffer.
517 : const size_t buffer_length = arraysize(js_stack_trace_);
518 0 : memset(&js_stack_trace_, 0, buffer_length);
519 : FixedStringAllocator fixed(&js_stack_trace_[0], buffer_length - 1);
520 : StringStream accumulator(&fixed, StringStream::kPrintObjectConcise);
521 0 : isolate->PrintStack(&accumulator, Isolate::kPrintStackVerbose);
522 : // Keeping a reference to the last code objects to increase likelyhood that
523 : // they get included in the minidump.
524 : const size_t code_objects_length = arraysize(code_objects_);
525 : size_t i = 0;
526 0 : StackFrameIterator it(isolate);
527 0 : for (; !it.done() && i < code_objects_length; it.Advance()) {
528 0 : if (it.frame()->type() == StackFrame::INTERNAL) continue;
529 0 : code_objects_[i++] =
530 0 : reinterpret_cast<void*>(it.frame()->unchecked_code().ptr());
531 : }
532 0 : }
533 :
534 : namespace {
535 :
536 : class StackFrameCacheHelper : public AllStatic {
537 : public:
538 61728 : static MaybeHandle<StackTraceFrame> LookupCachedFrame(
539 : Isolate* isolate, Handle<AbstractCode> code, int code_offset) {
540 61728 : if (FLAG_optimize_for_size) return MaybeHandle<StackTraceFrame>();
541 :
542 123456 : const auto maybe_cache = handle(code->stack_frame_cache(), isolate);
543 61728 : if (!maybe_cache->IsSimpleNumberDictionary())
544 8199 : return MaybeHandle<StackTraceFrame>();
545 :
546 : const auto cache = Handle<SimpleNumberDictionary>::cast(maybe_cache);
547 107058 : const int entry = cache->FindEntry(isolate, code_offset);
548 53529 : if (entry != NumberDictionary::kNotFound) {
549 102302 : return handle(StackTraceFrame::cast(cache->ValueAt(entry)), isolate);
550 : }
551 2378 : return MaybeHandle<StackTraceFrame>();
552 : }
553 :
554 10577 : static void CacheFrameAndUpdateCache(Isolate* isolate,
555 : Handle<AbstractCode> code,
556 : int code_offset,
557 : Handle<StackTraceFrame> frame) {
558 10577 : if (FLAG_optimize_for_size) return;
559 :
560 21154 : const auto maybe_cache = handle(code->stack_frame_cache(), isolate);
561 : const auto cache = maybe_cache->IsSimpleNumberDictionary()
562 : ? Handle<SimpleNumberDictionary>::cast(maybe_cache)
563 10577 : : SimpleNumberDictionary::New(isolate, 1);
564 : Handle<SimpleNumberDictionary> new_cache =
565 10577 : SimpleNumberDictionary::Set(isolate, cache, code_offset, frame);
566 20805 : if (*new_cache != *cache || !maybe_cache->IsSimpleNumberDictionary()) {
567 8548 : AbstractCode::SetStackFrameCache(code, new_cache);
568 : }
569 : }
570 : };
571 :
572 : } // anonymous namespace
573 :
574 : class FrameArrayBuilder {
575 : public:
576 : enum FrameFilterMode { ALL, CURRENT_SECURITY_CONTEXT };
577 :
578 1311087 : FrameArrayBuilder(Isolate* isolate, FrameSkipMode mode, int limit,
579 : Handle<Object> caller, FrameFilterMode filter_mode)
580 : : isolate_(isolate),
581 : mode_(mode),
582 : limit_(limit),
583 : caller_(caller),
584 1311087 : check_security_context_(filter_mode == CURRENT_SECURITY_CONTEXT) {
585 1311087 : switch (mode_) {
586 : case SKIP_FIRST:
587 : skip_next_frame_ = true;
588 : break;
589 : case SKIP_UNTIL_SEEN:
590 : DCHECK(caller_->IsJSFunction());
591 : skip_next_frame_ = true;
592 : break;
593 : case SKIP_NONE:
594 1288244 : skip_next_frame_ = false;
595 1288244 : break;
596 : }
597 :
598 1311087 : elements_ = isolate->factory()->NewFrameArray(Min(limit, 10));
599 1311087 : }
600 :
601 1355 : void AppendAsyncFrame(Handle<JSGeneratorObject> generator_object) {
602 1355 : if (full()) return;
603 1355 : Handle<JSFunction> function(generator_object->function(), isolate_);
604 1355 : if (!IsVisibleInStackTrace(function)) return;
605 : int flags = FrameArray::kIsAsync;
606 1355 : if (IsStrictFrame(function)) flags |= FrameArray::kIsStrict;
607 :
608 1355 : Handle<Object> receiver(generator_object->receiver(), isolate_);
609 : Handle<AbstractCode> code(
610 4065 : AbstractCode::cast(function->shared()->GetBytecodeArray()), isolate_);
611 : int offset = Smi::ToInt(generator_object->input_or_debug_pos());
612 : // The stored bytecode offset is relative to a different base than what
613 : // is used in the source position table, hence the subtraction.
614 1355 : offset -= BytecodeArray::kHeaderSize - kHeapObjectTag;
615 :
616 1355 : Handle<FixedArray> parameters = isolate_->factory()->empty_fixed_array();
617 1355 : if (V8_UNLIKELY(FLAG_detailed_error_stack_trace)) {
618 0 : int param_count = function->shared()->internal_formal_parameter_count();
619 0 : parameters = isolate_->factory()->NewFixedArray(param_count);
620 0 : for (int i = 0; i < param_count; i++) {
621 0 : parameters->set(i,
622 0 : generator_object->parameters_and_registers()->get(i));
623 : }
624 : }
625 :
626 : elements_ = FrameArray::AppendJSFrame(elements_, receiver, function, code,
627 1355 : offset, flags, parameters);
628 : }
629 :
630 108 : void AppendPromiseAllFrame(Handle<Context> context, int offset) {
631 108 : if (full()) return;
632 : int flags = FrameArray::kIsAsync | FrameArray::kIsPromiseAll;
633 :
634 324 : Handle<Context> native_context(context->native_context(), isolate_);
635 324 : Handle<JSFunction> function(native_context->promise_all(), isolate_);
636 108 : if (!IsVisibleInStackTrace(function)) return;
637 :
638 324 : Handle<Object> receiver(native_context->promise_function(), isolate_);
639 108 : Handle<AbstractCode> code(AbstractCode::cast(function->code()), isolate_);
640 :
641 : // TODO(mmarchini) save Promises list from Promise.all()
642 216 : Handle<FixedArray> parameters = isolate_->factory()->empty_fixed_array();
643 :
644 : elements_ = FrameArray::AppendJSFrame(elements_, receiver, function, code,
645 108 : offset, flags, parameters);
646 : }
647 :
648 4979744 : void AppendJavaScriptFrame(
649 : FrameSummary::JavaScriptFrameSummary const& summary) {
650 : // Filter out internal frames that we do not want to show.
651 4987752 : if (!IsVisibleInStackTrace(summary.function())) return;
652 :
653 4971736 : Handle<AbstractCode> abstract_code = summary.abstract_code();
654 : const int offset = summary.code_offset();
655 :
656 : const bool is_constructor = summary.is_constructor();
657 :
658 : int flags = 0;
659 4971736 : Handle<JSFunction> function = summary.function();
660 4971736 : if (IsStrictFrame(function)) flags |= FrameArray::kIsStrict;
661 4971736 : if (is_constructor) flags |= FrameArray::kIsConstructor;
662 :
663 9943472 : Handle<FixedArray> parameters = isolate_->factory()->empty_fixed_array();
664 4971736 : if (V8_UNLIKELY(FLAG_detailed_error_stack_trace))
665 45 : parameters = summary.parameters();
666 :
667 : elements_ = FrameArray::AppendJSFrame(
668 : elements_, TheHoleToUndefined(isolate_, summary.receiver()), function,
669 4971736 : abstract_code, offset, flags, parameters);
670 : }
671 :
672 155191 : void AppendWasmCompiledFrame(
673 : FrameSummary::WasmCompiledFrameSummary const& summary) {
674 155191 : if (summary.code()->kind() != wasm::WasmCode::kFunction) return;
675 : Handle<WasmInstanceObject> instance = summary.wasm_instance();
676 : int flags = 0;
677 310382 : if (instance->module_object()->is_asm_js()) {
678 : flags |= FrameArray::kIsAsmJsWasmFrame;
679 400 : if (summary.at_to_number_conversion()) {
680 : flags |= FrameArray::kAsmJsAtNumberConversion;
681 : }
682 : } else {
683 : flags |= FrameArray::kIsWasmFrame;
684 : }
685 :
686 : elements_ = FrameArray::AppendWasmFrame(
687 155191 : elements_, instance, summary.function_index(), summary.code(),
688 155191 : summary.code_offset(), flags);
689 : }
690 :
691 1644 : void AppendWasmInterpretedFrame(
692 : FrameSummary::WasmInterpretedFrameSummary const& summary) {
693 1644 : Handle<WasmInstanceObject> instance = summary.wasm_instance();
694 : int flags = FrameArray::kIsWasmInterpretedFrame;
695 : DCHECK(!instance->module_object()->is_asm_js());
696 : elements_ = FrameArray::AppendWasmFrame(elements_, instance,
697 : summary.function_index(), {},
698 1644 : summary.byte_offset(), flags);
699 1644 : }
700 :
701 61056 : void AppendBuiltinExitFrame(BuiltinExitFrame* exit_frame) {
702 122112 : Handle<JSFunction> function = handle(exit_frame->function(), isolate_);
703 :
704 : // Filter out internal frames that we do not want to show.
705 91302 : if (!IsVisibleInStackTrace(function)) return;
706 :
707 30810 : Handle<Object> receiver(exit_frame->receiver(), isolate_);
708 30810 : Handle<Code> code(exit_frame->LookupCode(), isolate_);
709 : const int offset =
710 92430 : static_cast<int>(exit_frame->pc() - code->InstructionStart());
711 :
712 : int flags = 0;
713 30810 : if (IsStrictFrame(function)) flags |= FrameArray::kIsStrict;
714 30810 : if (exit_frame->IsConstructor()) flags |= FrameArray::kIsConstructor;
715 :
716 30810 : Handle<FixedArray> parameters = isolate_->factory()->empty_fixed_array();
717 30810 : if (V8_UNLIKELY(FLAG_detailed_error_stack_trace)) {
718 5 : int param_count = exit_frame->ComputeParametersCount();
719 5 : parameters = isolate_->factory()->NewFixedArray(param_count);
720 25 : for (int i = 0; i < param_count; i++) {
721 20 : parameters->set(i, exit_frame->GetParameter(i));
722 : }
723 : }
724 :
725 : elements_ = FrameArray::AppendJSFrame(elements_, receiver, function,
726 : Handle<AbstractCode>::cast(code),
727 30810 : offset, flags, parameters);
728 : }
729 :
730 14677979 : bool full() { return elements_->FrameCount() >= limit_; }
731 :
732 : Handle<FrameArray> GetElements() {
733 2492490 : elements_->ShrinkToFit(isolate_);
734 1246245 : return elements_;
735 : }
736 :
737 : // Creates a StackTraceFrame object for each frame in the FrameArray.
738 64842 : Handle<FixedArray> GetElementsAsStackTraceFrameArray() {
739 129684 : elements_->ShrinkToFit(isolate_);
740 : const int frame_count = elements_->FrameCount();
741 : Handle<FixedArray> stack_trace =
742 64842 : isolate_->factory()->NewFixedArray(frame_count);
743 :
744 189186 : for (int i = 0; i < frame_count; ++i) {
745 : // Caching stack frames only happens for non-Wasm frames.
746 62172 : if (!elements_->IsAnyWasmFrame(i)) {
747 : MaybeHandle<StackTraceFrame> maybe_frame =
748 : StackFrameCacheHelper::LookupCachedFrame(
749 : isolate_, handle(elements_->Code(i), isolate_),
750 246912 : Smi::ToInt(elements_->Offset(i)));
751 61728 : if (!maybe_frame.is_null()) {
752 : Handle<StackTraceFrame> frame = maybe_frame.ToHandleChecked();
753 102302 : stack_trace->set(i, *frame);
754 : continue;
755 : }
756 : }
757 :
758 : Handle<StackTraceFrame> frame =
759 11021 : isolate_->factory()->NewStackTraceFrame(elements_, i);
760 22042 : stack_trace->set(i, *frame);
761 :
762 11021 : if (!elements_->IsAnyWasmFrame(i)) {
763 42308 : StackFrameCacheHelper::CacheFrameAndUpdateCache(
764 : isolate_, handle(elements_->Code(i), isolate_),
765 31731 : Smi::ToInt(elements_->Offset(i)), frame);
766 : }
767 : }
768 64842 : return stack_trace;
769 : }
770 :
771 : private:
772 : // Poison stack frames below the first strict mode frame.
773 : // The stack trace API should not expose receivers and function
774 : // objects on frames deeper than the top-most one with a strict mode
775 : // function.
776 5003901 : bool IsStrictFrame(Handle<JSFunction> function) {
777 5003901 : if (!encountered_strict_function_) {
778 : encountered_strict_function_ =
779 3700845 : is_strict(function->shared()->language_mode());
780 : }
781 5003901 : return encountered_strict_function_;
782 : }
783 :
784 : // Determines whether the given stack frame should be displayed in a stack
785 : // trace.
786 5042263 : bool IsVisibleInStackTrace(Handle<JSFunction> function) {
787 10048636 : return ShouldIncludeFrame(function) && IsNotHidden(function) &&
788 10048636 : IsInSameSecurityContext(function);
789 : }
790 :
791 : // This mechanism excludes a number of uninteresting frames from the stack
792 : // trace. This can be be the first frame (which will be a builtin-exit frame
793 : // for the error constructor builtin) or every frame until encountering a
794 : // user-specified function.
795 5042263 : bool ShouldIncludeFrame(Handle<JSFunction> function) {
796 5042263 : switch (mode_) {
797 : case SKIP_NONE:
798 : return true;
799 : case SKIP_FIRST:
800 2714 : if (!skip_next_frame_) return true;
801 590 : skip_next_frame_ = false;
802 590 : return false;
803 : case SKIP_UNTIL_SEEN:
804 166644 : if (skip_next_frame_ && (*function == *caller_)) {
805 21992 : skip_next_frame_ = false;
806 21992 : return false;
807 : }
808 119204 : return !skip_next_frame_;
809 : }
810 0 : UNREACHABLE();
811 : }
812 :
813 5016225 : bool IsNotHidden(Handle<JSFunction> function) {
814 : // Functions defined not in user scripts are not visible unless directly
815 : // exposed, in which case the native flag is set.
816 : // The --builtins-in-stack-traces command line flag allows including
817 : // internal call sites in the stack trace for debugging purposes.
818 15048531 : if (!FLAG_builtins_in_stack_traces &&
819 10032306 : !function->shared()->IsUserJavaScript()) {
820 : return function->shared()->native();
821 : }
822 : return true;
823 : }
824 :
825 5006373 : bool IsInSameSecurityContext(Handle<JSFunction> function) {
826 5006373 : if (!check_security_context_) return true;
827 9891022 : return isolate_->context()->HasSameSecurityTokenAs(function->context());
828 : }
829 :
830 : // TODO(jgruber): Fix all cases in which frames give us a hole value (e.g. the
831 : // receiver in RegExp constructor frames.
832 : Handle<Object> TheHoleToUndefined(Isolate* isolate, Handle<Object> in) {
833 : return (in->IsTheHole(isolate))
834 : ? Handle<Object>::cast(isolate->factory()->undefined_value())
835 4971736 : : in;
836 : }
837 :
838 : Isolate* isolate_;
839 : const FrameSkipMode mode_;
840 : int limit_;
841 : const Handle<Object> caller_;
842 : bool skip_next_frame_ = true;
843 : bool encountered_strict_function_ = false;
844 : const bool check_security_context_;
845 : Handle<FrameArray> elements_;
846 : };
847 :
848 1253730 : bool GetStackTraceLimit(Isolate* isolate, int* result) {
849 1253730 : Handle<JSObject> error = isolate->error_function();
850 :
851 : Handle<String> key = isolate->factory()->stackTraceLimit_string();
852 1253730 : Handle<Object> stack_trace_limit = JSReceiver::GetDataProperty(error, key);
853 1253730 : if (!stack_trace_limit->IsNumber()) return false;
854 :
855 : // Ensure that limit is not negative.
856 1246245 : *result = Max(FastD2IChecked(stack_trace_limit->Number()), 0);
857 :
858 1246245 : if (*result != FLAG_stack_trace_limit) {
859 54 : isolate->CountUsage(v8::Isolate::kErrorStackTraceLimit);
860 : }
861 :
862 : return true;
863 : }
864 :
865 280463 : bool NoExtension(const v8::FunctionCallbackInfo<v8::Value>&) { return false; }
866 :
867 673057 : bool IsBuiltinFunction(Isolate* isolate, HeapObject object,
868 : Builtins::Name builtin_index) {
869 673057 : if (!object->IsJSFunction()) return false;
870 : JSFunction const function = JSFunction::cast(object);
871 901618 : return function->code() == isolate->builtins()->builtin(builtin_index);
872 : }
873 :
874 2938 : void CaptureAsyncStackTrace(Isolate* isolate, Handle<JSPromise> promise,
875 : FrameArrayBuilder* builder) {
876 170382 : while (!builder->full()) {
877 : // Check that the {promise} is not settled.
878 170373 : if (promise->status() != Promise::kPending) return;
879 :
880 : // Check that we have exactly one PromiseReaction on the {promise}.
881 170335 : if (!promise->reactions()->IsPromiseReaction()) return;
882 : Handle<PromiseReaction> reaction(
883 : PromiseReaction::cast(promise->reactions()), isolate);
884 167444 : if (!reaction->next()->IsSmi()) return;
885 :
886 : // Check if the {reaction} has one of the known async function or
887 : // async generator continuations as its fulfill handler.
888 334888 : if (IsBuiltinFunction(isolate, reaction->fulfill_handler(),
889 166161 : Builtins::kAsyncFunctionAwaitResolveClosure) ||
890 166161 : IsBuiltinFunction(isolate, reaction->fulfill_handler(),
891 333569 : Builtins::kAsyncGeneratorAwaitResolveClosure) ||
892 166125 : IsBuiltinFunction(isolate, reaction->fulfill_handler(),
893 : Builtins::kAsyncGeneratorYieldResolveClosure)) {
894 : // Now peak into the handlers' AwaitContext to get to
895 : // the JSGeneratorObject for the async function.
896 : Handle<Context> context(
897 : JSFunction::cast(reaction->fulfill_handler())->context(), isolate);
898 : Handle<JSGeneratorObject> generator_object(
899 2710 : JSGeneratorObject::cast(context->extension()), isolate);
900 1355 : CHECK(generator_object->is_suspended());
901 :
902 : // Append async frame corresponding to the {generator_object}.
903 1355 : builder->AppendAsyncFrame(generator_object);
904 :
905 : // Try to continue from here.
906 1355 : if (generator_object->IsJSAsyncFunctionObject()) {
907 : Handle<JSAsyncFunctionObject> async_function_object =
908 : Handle<JSAsyncFunctionObject>::cast(generator_object);
909 : promise = handle(async_function_object->promise(), isolate);
910 : } else {
911 : Handle<JSAsyncGeneratorObject> async_generator_object =
912 : Handle<JSAsyncGeneratorObject>::cast(generator_object);
913 72 : if (async_generator_object->queue()->IsUndefined(isolate)) return;
914 : Handle<AsyncGeneratorRequest> async_generator_request(
915 : AsyncGeneratorRequest::cast(async_generator_object->queue()),
916 : isolate);
917 : promise = handle(JSPromise::cast(async_generator_request->promise()),
918 : isolate);
919 : }
920 166089 : } else if (IsBuiltinFunction(isolate, reaction->fulfill_handler(),
921 : Builtins::kPromiseAllResolveElementClosure)) {
922 : Handle<JSFunction> function(JSFunction::cast(reaction->fulfill_handler()),
923 : isolate);
924 : Handle<Context> context(function->context(), isolate);
925 :
926 : // We store the offset of the promise into the {function}'s
927 : // hash field for promise resolve element callbacks.
928 216 : int const offset = Smi::ToInt(Smi::cast(function->GetIdentityHash())) - 1;
929 108 : builder->AppendPromiseAllFrame(context, offset);
930 :
931 : // Now peak into the Promise.all() resolve element context to
932 : // find the promise capability that's being resolved when all
933 : // the concurrent promises resolve.
934 : int const index =
935 : PromiseBuiltins::kPromiseAllResolveElementCapabilitySlot;
936 : Handle<PromiseCapability> capability(
937 : PromiseCapability::cast(context->get(index)), isolate);
938 108 : if (!capability->promise()->IsJSPromise()) return;
939 : promise = handle(JSPromise::cast(capability->promise()), isolate);
940 : } else {
941 : // We have some generic promise chain here, so try to
942 : // continue with the chained promise on the reaction
943 : // (only works for native promise chains).
944 : Handle<HeapObject> promise_or_capability(
945 : reaction->promise_or_capability(), isolate);
946 165981 : if (promise_or_capability->IsJSPromise()) {
947 : promise = Handle<JSPromise>::cast(promise_or_capability);
948 0 : } else if (promise_or_capability->IsPromiseCapability()) {
949 : Handle<PromiseCapability> capability =
950 : Handle<PromiseCapability>::cast(promise_or_capability);
951 0 : if (!capability->promise()->IsJSPromise()) return;
952 : promise = handle(JSPromise::cast(capability->promise()), isolate);
953 : } else {
954 : // Otherwise the {promise_or_capability} must be undefined here.
955 0 : CHECK(promise_or_capability->IsUndefined(isolate));
956 : return;
957 : }
958 : }
959 : }
960 : }
961 :
962 : namespace {
963 :
964 : struct CaptureStackTraceOptions {
965 : int limit;
966 : // 'filter_mode' and 'skip_mode' are somewhat orthogonal. 'filter_mode'
967 : // specifies whether to capture all frames, or just frames in the same
968 : // security context. While 'skip_mode' allows skipping the first frame.
969 : FrameSkipMode skip_mode;
970 : FrameArrayBuilder::FrameFilterMode filter_mode;
971 :
972 : bool capture_builtin_exit_frames;
973 : bool capture_only_frames_subject_to_debugging;
974 : bool async_stack_trace;
975 :
976 : enum CaptureResult { RAW_FRAME_ARRAY, STACK_TRACE_FRAME_ARRAY };
977 : CaptureResult capture_result;
978 : };
979 :
980 1311087 : Handle<Object> CaptureStackTrace(Isolate* isolate, Handle<Object> caller,
981 : CaptureStackTraceOptions options) {
982 2622174 : DisallowJavascriptExecution no_js(isolate);
983 :
984 : FrameArrayBuilder builder(isolate, options.skip_mode, options.limit, caller,
985 1311087 : options.filter_mode);
986 :
987 : // Build the regular stack trace, and remember the last relevant
988 : // frame ID and inlined index (for the async stack trace handling
989 : // below, which starts from this last frame).
990 10678327 : for (StackFrameIterator it(isolate); !it.done() && !builder.full();
991 9117257 : it.Advance()) {
992 : StackFrame* const frame = it.frame();
993 9117257 : switch (frame->type()) {
994 : case StackFrame::JAVA_SCRIPT_BUILTIN_CONTINUATION:
995 : case StackFrame::JAVA_SCRIPT_BUILTIN_CONTINUATION_WITH_CATCH:
996 : case StackFrame::OPTIMIZED:
997 : case StackFrame::INTERPRETED:
998 : case StackFrame::BUILTIN:
999 : case StackFrame::WASM_COMPILED:
1000 : case StackFrame::WASM_INTERPRETER_ENTRY: {
1001 : // A standard frame may include many summarized frames (due to
1002 : // inlining).
1003 4984703 : std::vector<FrameSummary> frames;
1004 4984703 : StandardFrame::cast(frame)->Summarize(&frames);
1005 15262351 : for (size_t i = frames.size(); i-- != 0 && !builder.full();) {
1006 : const auto& summary = frames[i];
1007 5203101 : if (options.capture_only_frames_subject_to_debugging &&
1008 64347 : !summary.is_subject_to_debugging()) {
1009 : continue;
1010 : }
1011 :
1012 5136579 : if (summary.IsJavaScript()) {
1013 : //=========================================================
1014 : // Handle a JavaScript frame.
1015 : //=========================================================
1016 : auto const& java_script = summary.AsJavaScript();
1017 4979744 : builder.AppendJavaScriptFrame(java_script);
1018 156835 : } else if (summary.IsWasmCompiled()) {
1019 : //=========================================================
1020 : // Handle a WASM compiled frame.
1021 : //=========================================================
1022 : auto const& wasm_compiled = summary.AsWasmCompiled();
1023 155191 : builder.AppendWasmCompiledFrame(wasm_compiled);
1024 1644 : } else if (summary.IsWasmInterpreted()) {
1025 : //=========================================================
1026 : // Handle a WASM interpreted frame.
1027 : //=========================================================
1028 : auto const& wasm_interpreted = summary.AsWasmInterpreted();
1029 1644 : builder.AppendWasmInterpretedFrame(wasm_interpreted);
1030 : }
1031 : }
1032 : break;
1033 : }
1034 :
1035 : case StackFrame::BUILTIN_EXIT:
1036 68907 : if (!options.capture_builtin_exit_frames) continue;
1037 :
1038 : // BuiltinExitFrames are not standard frames, so they do not have
1039 : // Summarize(). However, they may have one JS frame worth showing.
1040 61056 : builder.AppendBuiltinExitFrame(BuiltinExitFrame::cast(frame));
1041 : break;
1042 :
1043 : default:
1044 : break;
1045 : }
1046 : }
1047 :
1048 : // If --async-stack-traces are enabled and the "current microtask" is a
1049 : // PromiseReactionJobTask, we try to enrich the stack trace with async
1050 : // frames.
1051 1311087 : if (options.async_stack_trace) {
1052 : Handle<Object> current_microtask = isolate->factory()->current_microtask();
1053 1245867 : if (current_microtask->IsPromiseReactionJobTask()) {
1054 : Handle<PromiseReactionJobTask> promise_reaction_job_task =
1055 : Handle<PromiseReactionJobTask>::cast(current_microtask);
1056 : // Check if the {reaction} has one of the known async function or
1057 : // async generator continuations as its fulfill handler.
1058 6130 : if (IsBuiltinFunction(isolate, promise_reaction_job_task->handler(),
1059 2154 : Builtins::kAsyncFunctionAwaitResolveClosure) ||
1060 2154 : IsBuiltinFunction(isolate, promise_reaction_job_task->handler(),
1061 5084 : Builtins::kAsyncGeneratorAwaitResolveClosure) ||
1062 2019 : IsBuiltinFunction(isolate, promise_reaction_job_task->handler(),
1063 : Builtins::kAsyncGeneratorYieldResolveClosure)) {
1064 : // Now peak into the handlers' AwaitContext to get to
1065 : // the JSGeneratorObject for the async function.
1066 : Handle<Context> context(
1067 : JSFunction::cast(promise_reaction_job_task->handler())->context(),
1068 : isolate);
1069 : Handle<JSGeneratorObject> generator_object(
1070 2092 : JSGeneratorObject::cast(context->extension()), isolate);
1071 1046 : if (generator_object->is_executing()) {
1072 1027 : if (generator_object->IsJSAsyncFunctionObject()) {
1073 : Handle<JSAsyncFunctionObject> async_function_object =
1074 : Handle<JSAsyncFunctionObject>::cast(generator_object);
1075 : Handle<JSPromise> promise(async_function_object->promise(),
1076 : isolate);
1077 892 : CaptureAsyncStackTrace(isolate, promise, &builder);
1078 : } else {
1079 : Handle<JSAsyncGeneratorObject> async_generator_object =
1080 : Handle<JSAsyncGeneratorObject>::cast(generator_object);
1081 : Handle<AsyncGeneratorRequest> async_generator_request(
1082 : AsyncGeneratorRequest::cast(async_generator_object->queue()),
1083 : isolate);
1084 : Handle<JSPromise> promise(
1085 : JSPromise::cast(async_generator_request->promise()), isolate);
1086 135 : CaptureAsyncStackTrace(isolate, promise, &builder);
1087 : }
1088 : }
1089 : } else {
1090 : // The {promise_reaction_job_task} doesn't belong to an await (or
1091 : // yield inside an async generator), but we might still be able to
1092 : // find an async frame if we follow along the chain of promises on
1093 : // the {promise_reaction_job_task}.
1094 : Handle<HeapObject> promise_or_capability(
1095 : promise_reaction_job_task->promise_or_capability(), isolate);
1096 2019 : if (promise_or_capability->IsJSPromise()) {
1097 : Handle<JSPromise> promise =
1098 1911 : Handle<JSPromise>::cast(promise_or_capability);
1099 1911 : CaptureAsyncStackTrace(isolate, promise, &builder);
1100 : }
1101 : }
1102 : }
1103 : }
1104 :
1105 : // TODO(yangguo): Queue this structured stack trace for preprocessing on GC.
1106 1311087 : if (options.capture_result == CaptureStackTraceOptions::RAW_FRAME_ARRAY) {
1107 1246245 : return isolate->factory()->NewJSArrayWithElements(builder.GetElements());
1108 : }
1109 64842 : return builder.GetElementsAsStackTraceFrameArray();
1110 : }
1111 :
1112 : } // namespace
1113 :
1114 1253730 : Handle<Object> Isolate::CaptureSimpleStackTrace(Handle<JSReceiver> error_object,
1115 : FrameSkipMode mode,
1116 : Handle<Object> caller) {
1117 : int limit;
1118 1261215 : if (!GetStackTraceLimit(this, &limit)) return factory()->undefined_value();
1119 :
1120 : CaptureStackTraceOptions options;
1121 1246245 : options.limit = limit;
1122 : options.skip_mode = mode;
1123 : options.capture_builtin_exit_frames = true;
1124 1246245 : options.async_stack_trace = FLAG_async_stack_traces;
1125 : options.filter_mode = FrameArrayBuilder::CURRENT_SECURITY_CONTEXT;
1126 : options.capture_only_frames_subject_to_debugging = false;
1127 : options.capture_result = CaptureStackTraceOptions::RAW_FRAME_ARRAY;
1128 :
1129 1246245 : return CaptureStackTrace(this, caller, options);
1130 : }
1131 :
1132 1205315 : MaybeHandle<JSReceiver> Isolate::CaptureAndSetDetailedStackTrace(
1133 : Handle<JSReceiver> error_object) {
1134 1205315 : if (capture_stack_trace_for_uncaught_exceptions_) {
1135 : // Capture stack trace for a detailed exception message.
1136 : Handle<Name> key = factory()->detailed_stack_trace_symbol();
1137 : Handle<FixedArray> stack_trace = CaptureCurrentStackTrace(
1138 : stack_trace_for_uncaught_exceptions_frame_limit_,
1139 264 : stack_trace_for_uncaught_exceptions_options_);
1140 528 : RETURN_ON_EXCEPTION(
1141 : this,
1142 : Object::SetProperty(this, error_object, key, stack_trace,
1143 : StoreOrigin::kMaybeKeyed,
1144 : Just(ShouldThrow::kThrowOnError)),
1145 : JSReceiver);
1146 : }
1147 1205315 : return error_object;
1148 : }
1149 :
1150 1253730 : MaybeHandle<JSReceiver> Isolate::CaptureAndSetSimpleStackTrace(
1151 : Handle<JSReceiver> error_object, FrameSkipMode mode,
1152 : Handle<Object> caller) {
1153 : // Capture stack trace for simple stack trace string formatting.
1154 : Handle<Name> key = factory()->stack_trace_symbol();
1155 : Handle<Object> stack_trace =
1156 1253730 : CaptureSimpleStackTrace(error_object, mode, caller);
1157 2507460 : RETURN_ON_EXCEPTION(this,
1158 : Object::SetProperty(this, error_object, key, stack_trace,
1159 : StoreOrigin::kMaybeKeyed,
1160 : Just(ShouldThrow::kThrowOnError)),
1161 : JSReceiver);
1162 1253730 : return error_object;
1163 : }
1164 :
1165 363 : Handle<FixedArray> Isolate::GetDetailedStackTrace(
1166 : Handle<JSObject> error_object) {
1167 : Handle<Name> key_detailed = factory()->detailed_stack_trace_symbol();
1168 : Handle<Object> stack_trace =
1169 363 : JSReceiver::GetDataProperty(error_object, key_detailed);
1170 363 : if (stack_trace->IsFixedArray()) return Handle<FixedArray>::cast(stack_trace);
1171 16 : return Handle<FixedArray>();
1172 : }
1173 :
1174 4156 : Address Isolate::GetAbstractPC(int* line, int* column) {
1175 4156 : JavaScriptFrameIterator it(this);
1176 :
1177 4156 : if (it.done()) {
1178 0 : *line = -1;
1179 0 : *column = -1;
1180 0 : return kNullAddress;
1181 : }
1182 : JavaScriptFrame* frame = it.frame();
1183 : DCHECK(!frame->is_builtin());
1184 4156 : int position = frame->position();
1185 :
1186 8312 : Object maybe_script = frame->function()->shared()->script();
1187 4156 : if (maybe_script->IsScript()) {
1188 : Handle<Script> script(Script::cast(maybe_script), this);
1189 : Script::PositionInfo info;
1190 4156 : Script::GetPositionInfo(script, position, &info, Script::WITH_OFFSET);
1191 4156 : *line = info.line + 1;
1192 4156 : *column = info.column + 1;
1193 : } else {
1194 0 : *line = position;
1195 0 : *column = -1;
1196 : }
1197 :
1198 8312 : if (frame->is_interpreted()) {
1199 : InterpretedFrame* iframe = static_cast<InterpretedFrame*>(frame);
1200 : Address bytecode_start =
1201 6696 : iframe->GetBytecodeArray()->GetFirstBytecodeAddress();
1202 3348 : return bytecode_start + iframe->GetBytecodeOffset();
1203 : }
1204 :
1205 808 : return frame->pc();
1206 : }
1207 :
1208 64842 : Handle<FixedArray> Isolate::CaptureCurrentStackTrace(
1209 : int frame_limit, StackTrace::StackTraceOptions stack_trace_options) {
1210 : CaptureStackTraceOptions options;
1211 : options.limit = Max(frame_limit, 0); // Ensure no negative values.
1212 : options.skip_mode = SKIP_NONE;
1213 : options.capture_builtin_exit_frames = false;
1214 : options.async_stack_trace = false;
1215 : options.filter_mode =
1216 64842 : (stack_trace_options & StackTrace::kExposeFramesAcrossSecurityOrigins)
1217 : ? FrameArrayBuilder::ALL
1218 64842 : : FrameArrayBuilder::CURRENT_SECURITY_CONTEXT;
1219 : options.capture_only_frames_subject_to_debugging = true;
1220 : options.capture_result = CaptureStackTraceOptions::STACK_TRACE_FRAME_ARRAY;
1221 :
1222 : return Handle<FixedArray>::cast(
1223 64842 : CaptureStackTrace(this, factory()->undefined_value(), options));
1224 : }
1225 :
1226 17 : void Isolate::PrintStack(FILE* out, PrintStackMode mode) {
1227 17 : if (stack_trace_nesting_level_ == 0) {
1228 17 : stack_trace_nesting_level_++;
1229 17 : StringStream::ClearMentionedObjectCache(this);
1230 : HeapStringAllocator allocator;
1231 : StringStream accumulator(&allocator);
1232 17 : incomplete_message_ = &accumulator;
1233 17 : PrintStack(&accumulator, mode);
1234 17 : accumulator.OutputToFile(out);
1235 17 : InitializeLoggingAndCounters();
1236 17 : accumulator.Log(this);
1237 17 : incomplete_message_ = nullptr;
1238 17 : stack_trace_nesting_level_ = 0;
1239 0 : } else if (stack_trace_nesting_level_ == 1) {
1240 0 : stack_trace_nesting_level_++;
1241 : base::OS::PrintError(
1242 0 : "\n\nAttempt to print stack while printing stack (double fault)\n");
1243 : base::OS::PrintError(
1244 0 : "If you are lucky you may find a partial stack dump on stdout.\n\n");
1245 0 : incomplete_message_->OutputToFile(out);
1246 : }
1247 17 : }
1248 :
1249 :
1250 25 : static void PrintFrames(Isolate* isolate,
1251 : StringStream* accumulator,
1252 : StackFrame::PrintMode mode) {
1253 25 : StackFrameIterator it(isolate);
1254 477 : for (int i = 0; !it.done(); it.Advance()) {
1255 226 : it.frame()->Print(accumulator, mode, i++);
1256 : }
1257 25 : }
1258 :
1259 32 : void Isolate::PrintStack(StringStream* accumulator, PrintStackMode mode) {
1260 : HandleScope scope(this);
1261 : DCHECK(accumulator->IsMentionedObjectCacheClear(this));
1262 :
1263 : // Avoid printing anything if there are no frames.
1264 32 : if (c_entry_fp(thread_local_top()) == 0) return;
1265 :
1266 : accumulator->Add(
1267 17 : "\n==== JS stack trace =========================================\n\n");
1268 17 : PrintFrames(this, accumulator, StackFrame::OVERVIEW);
1269 17 : if (mode == kPrintStackVerbose) {
1270 : accumulator->Add(
1271 8 : "\n==== Details ================================================\n\n");
1272 8 : PrintFrames(this, accumulator, StackFrame::DETAILS);
1273 8 : accumulator->PrintMentionedObjectCache(this);
1274 : }
1275 17 : accumulator->Add("=====================\n\n");
1276 : }
1277 :
1278 :
1279 26 : void Isolate::SetFailedAccessCheckCallback(
1280 : v8::FailedAccessCheckCallback callback) {
1281 26 : thread_local_top()->failed_access_check_callback_ = callback;
1282 26 : }
1283 :
1284 :
1285 1318 : void Isolate::ReportFailedAccessCheck(Handle<JSObject> receiver) {
1286 1318 : if (!thread_local_top()->failed_access_check_callback_) {
1287 3483 : return ScheduleThrow(*factory()->NewTypeError(MessageTemplate::kNoAccess));
1288 : }
1289 :
1290 : DCHECK(receiver->IsAccessCheckNeeded());
1291 : DCHECK(!context().is_null());
1292 :
1293 : // Get the data object from access check info.
1294 : HandleScope scope(this);
1295 : Handle<Object> data;
1296 : { DisallowHeapAllocation no_gc;
1297 157 : AccessCheckInfo access_check_info = AccessCheckInfo::Get(this, receiver);
1298 157 : if (access_check_info.is_null()) {
1299 : AllowHeapAllocation doesnt_matter_anymore;
1300 : return ScheduleThrow(
1301 0 : *factory()->NewTypeError(MessageTemplate::kNoAccess));
1302 : }
1303 : data = handle(access_check_info->data(), this);
1304 : }
1305 :
1306 : // Leaving JavaScript.
1307 314 : VMState<EXTERNAL> state(this);
1308 157 : thread_local_top()->failed_access_check_callback_(
1309 157 : v8::Utils::ToLocal(receiver), v8::ACCESS_HAS, v8::Utils::ToLocal(data));
1310 : }
1311 :
1312 :
1313 6039822 : bool Isolate::MayAccess(Handle<Context> accessing_context,
1314 : Handle<JSObject> receiver) {
1315 : DCHECK(receiver->IsJSGlobalProxy() || receiver->IsAccessCheckNeeded());
1316 :
1317 : // Check for compatibility between the security tokens in the
1318 : // current lexical context and the accessed object.
1319 :
1320 : // During bootstrapping, callback functions are not enabled yet.
1321 6039822 : if (bootstrapper()->IsActive()) return true;
1322 : {
1323 : DisallowHeapAllocation no_gc;
1324 :
1325 6039584 : if (receiver->IsJSGlobalProxy()) {
1326 : Object receiver_context =
1327 : JSGlobalProxy::cast(*receiver)->native_context();
1328 12074223 : if (!receiver_context->IsContext()) return false;
1329 :
1330 : // Get the native context of current top context.
1331 : // avoid using Isolate::native_context() because it uses Handle.
1332 : Context native_context =
1333 12075230 : accessing_context->global_object()->native_context();
1334 6037615 : if (receiver_context == native_context) return true;
1335 :
1336 3048 : if (Context::cast(receiver_context)->security_token() ==
1337 : native_context->security_token())
1338 : return true;
1339 : }
1340 : }
1341 :
1342 : HandleScope scope(this);
1343 : Handle<Object> data;
1344 : v8::AccessCheckCallback callback = nullptr;
1345 : { DisallowHeapAllocation no_gc;
1346 3097 : AccessCheckInfo access_check_info = AccessCheckInfo::Get(this, receiver);
1347 3097 : if (access_check_info.is_null()) return false;
1348 : Object fun_obj = access_check_info->callback();
1349 : callback = v8::ToCData<v8::AccessCheckCallback>(fun_obj);
1350 : data = handle(access_check_info->data(), this);
1351 : }
1352 :
1353 2400 : LOG(this, ApiSecurityCheck());
1354 :
1355 : {
1356 : // Leaving JavaScript.
1357 4800 : VMState<EXTERNAL> state(this);
1358 : return callback(v8::Utils::ToLocal(accessing_context),
1359 2400 : v8::Utils::ToLocal(receiver), v8::Utils::ToLocal(data));
1360 : }
1361 : }
1362 :
1363 48415 : Object Isolate::StackOverflow() {
1364 48415 : if (FLAG_abort_on_stack_or_string_length_overflow) {
1365 0 : FATAL("Aborting on stack overflow");
1366 : }
1367 :
1368 96830 : DisallowJavascriptExecution no_js(this);
1369 : HandleScope scope(this);
1370 :
1371 48415 : Handle<JSFunction> fun = range_error_function();
1372 : Handle<Object> msg = factory()->NewStringFromAsciiChecked(
1373 48415 : MessageFormatter::TemplateString(MessageTemplate::kStackOverflow));
1374 : Handle<Object> no_caller;
1375 : Handle<Object> exception;
1376 96830 : ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
1377 : this, exception,
1378 : ErrorUtils::Construct(this, fun, fun, msg, SKIP_NONE, no_caller, true));
1379 :
1380 48415 : Throw(*exception, nullptr);
1381 :
1382 : #ifdef VERIFY_HEAP
1383 : if (FLAG_verify_heap && FLAG_stress_compaction) {
1384 : heap()->CollectAllGarbage(Heap::kNoGCFlags,
1385 : GarbageCollectionReason::kTesting);
1386 : }
1387 : #endif // VERIFY_HEAP
1388 :
1389 48415 : return ReadOnlyRoots(heap()).exception();
1390 : }
1391 :
1392 4305 : Object Isolate::TerminateExecution() {
1393 4305 : return Throw(ReadOnlyRoots(this).termination_exception(), nullptr);
1394 : }
1395 :
1396 3114 : void Isolate::CancelTerminateExecution() {
1397 3114 : if (try_catch_handler()) {
1398 1298 : try_catch_handler()->has_terminated_ = false;
1399 : }
1400 6143 : if (has_pending_exception() &&
1401 : pending_exception() == ReadOnlyRoots(this).termination_exception()) {
1402 3029 : thread_local_top()->external_caught_exception_ = false;
1403 : clear_pending_exception();
1404 : }
1405 3177 : if (has_scheduled_exception() &&
1406 : scheduled_exception() == ReadOnlyRoots(this).termination_exception()) {
1407 63 : thread_local_top()->external_caught_exception_ = false;
1408 : clear_scheduled_exception();
1409 : }
1410 3114 : }
1411 :
1412 :
1413 60205 : void Isolate::RequestInterrupt(InterruptCallback callback, void* data) {
1414 : ExecutionAccess access(this);
1415 60205 : api_interrupts_queue_.push(InterruptEntry(callback, data));
1416 : stack_guard()->RequestApiInterrupt();
1417 60205 : }
1418 :
1419 :
1420 2165 : void Isolate::InvokeApiInterruptCallbacks() {
1421 : RuntimeCallTimerScope runtimeTimer(
1422 2165 : this, RuntimeCallCounterId::kInvokeApiInterruptCallbacks);
1423 : // Note: callback below should be called outside of execution access lock.
1424 : while (true) {
1425 : InterruptEntry entry;
1426 : {
1427 : ExecutionAccess access(this);
1428 64525 : if (api_interrupts_queue_.empty()) return;
1429 : entry = api_interrupts_queue_.front();
1430 : api_interrupts_queue_.pop();
1431 : }
1432 120390 : VMState<EXTERNAL> state(this);
1433 : HandleScope handle_scope(this);
1434 60195 : entry.first(reinterpret_cast<v8::Isolate*>(this), entry.second);
1435 : }
1436 : }
1437 :
1438 :
1439 30 : void ReportBootstrappingException(Handle<Object> exception,
1440 : MessageLocation* location) {
1441 30 : base::OS::PrintError("Exception thrown during bootstrapping\n");
1442 30 : if (location == nullptr || location->script().is_null()) return;
1443 : // We are bootstrapping and caught an error where the location is set
1444 : // and we have a script for the location.
1445 : // In this case we could have an extension (or an internal error
1446 : // somewhere) and we print out the line number at which the error occurred
1447 : // to the console for easier debugging.
1448 : int line_number =
1449 30 : location->script()->GetLineNumber(location->start_pos()) + 1;
1450 60 : if (exception->IsString() && location->script()->name()->IsString()) {
1451 : base::OS::PrintError(
1452 : "Extension or internal compilation error: %s in %s at line %d.\n",
1453 60 : String::cast(*exception)->ToCString().get(),
1454 60 : String::cast(location->script()->name())->ToCString().get(),
1455 30 : line_number);
1456 0 : } else if (location->script()->name()->IsString()) {
1457 : base::OS::PrintError(
1458 : "Extension or internal compilation error in %s at line %d.\n",
1459 0 : String::cast(location->script()->name())->ToCString().get(),
1460 0 : line_number);
1461 0 : } else if (exception->IsString()) {
1462 : base::OS::PrintError("Extension or internal compilation error: %s.\n",
1463 0 : String::cast(*exception)->ToCString().get());
1464 : } else {
1465 0 : base::OS::PrintError("Extension or internal compilation error.\n");
1466 : }
1467 : #ifdef OBJECT_PRINT
1468 : // Since comments and empty lines have been stripped from the source of
1469 : // builtins, print the actual source here so that line numbers match.
1470 : if (location->script()->source()->IsString()) {
1471 : Handle<String> src(String::cast(location->script()->source()),
1472 : location->script()->GetIsolate());
1473 : PrintF("Failing script:");
1474 : int len = src->length();
1475 : if (len == 0) {
1476 : PrintF(" <not available>\n");
1477 : } else {
1478 : PrintF("\n");
1479 : int line_number = 1;
1480 : PrintF("%5d: ", line_number);
1481 : for (int i = 0; i < len; i++) {
1482 : uint16_t character = src->Get(i);
1483 : PrintF("%c", character);
1484 : if (character == '\n' && i < len - 2) {
1485 : PrintF("%5d: ", ++line_number);
1486 : }
1487 : }
1488 : PrintF("\n");
1489 : }
1490 : }
1491 : #endif
1492 : }
1493 :
1494 1409794 : Object Isolate::Throw(Object raw_exception, MessageLocation* location) {
1495 : DCHECK(!has_pending_exception());
1496 :
1497 : HandleScope scope(this);
1498 : Handle<Object> exception(raw_exception, this);
1499 :
1500 1409794 : if (FLAG_print_all_exceptions) {
1501 : printf("=========================================================\n");
1502 : printf("Exception thrown:\n");
1503 0 : if (location) {
1504 : Handle<Script> script = location->script();
1505 0 : Handle<Object> name(script->GetNameOrSourceURL(), this);
1506 : printf("at ");
1507 0 : if (name->IsString() && String::cast(*name)->length() > 0)
1508 0 : String::cast(*name)->PrintOn(stdout);
1509 : else
1510 : printf("<anonymous>");
1511 : // Script::GetLineNumber and Script::GetColumnNumber can allocate on the heap to
1512 : // initialize the line_ends array, so be careful when calling them.
1513 : #ifdef DEBUG
1514 : if (AllowHeapAllocation::IsAllowed()) {
1515 : #else
1516 : if ((false)) {
1517 : #endif
1518 : printf(", %d:%d - %d:%d\n",
1519 : Script::GetLineNumber(script, location->start_pos()) + 1,
1520 : Script::GetColumnNumber(script, location->start_pos()),
1521 : Script::GetLineNumber(script, location->end_pos()) + 1,
1522 : Script::GetColumnNumber(script, location->end_pos()));
1523 : // Make sure to update the raw exception pointer in case it moved.
1524 : raw_exception = *exception;
1525 : } else {
1526 0 : printf(", line %d\n", script->GetLineNumber(location->start_pos()) + 1);
1527 : }
1528 : }
1529 : raw_exception->Print();
1530 : printf("Stack Trace:\n");
1531 0 : PrintStack(stdout);
1532 : printf("=========================================================\n");
1533 : }
1534 :
1535 : // Determine whether a message needs to be created for the given exception
1536 : // depending on the following criteria:
1537 : // 1) External v8::TryCatch missing: Always create a message because any
1538 : // JavaScript handler for a finally-block might re-throw to top-level.
1539 : // 2) External v8::TryCatch exists: Only create a message if the handler
1540 : // captures messages or is verbose (which reports despite the catch).
1541 : // 3) ReThrow from v8::TryCatch: The message from a previous throw still
1542 : // exists and we preserve it instead of creating a new message.
1543 1126454 : bool requires_message = try_catch_handler() == nullptr ||
1544 1467908 : try_catch_handler()->is_verbose_ ||
1545 58114 : try_catch_handler()->capture_message_;
1546 1409794 : bool rethrowing_message = thread_local_top()->rethrowing_message_;
1547 :
1548 1409794 : thread_local_top()->rethrowing_message_ = false;
1549 :
1550 : // Notify debugger of exception.
1551 1409794 : if (is_catchable_by_javascript(raw_exception)) {
1552 1405489 : debug()->OnThrow(exception);
1553 : }
1554 :
1555 : // Generate the message if required.
1556 1409794 : if (requires_message && !rethrowing_message) {
1557 1358674 : MessageLocation computed_location;
1558 : // If no location was specified we try to use a computed one instead.
1559 1358674 : if (location == nullptr && ComputeLocation(&computed_location)) {
1560 : location = &computed_location;
1561 : }
1562 :
1563 1358674 : if (bootstrapper()->IsActive()) {
1564 : // It's not safe to try to make message objects or collect stack traces
1565 : // while the bootstrapper is active since the infrastructure may not have
1566 : // been properly initialized.
1567 30 : ReportBootstrappingException(exception, location);
1568 : } else {
1569 1358644 : Handle<Object> message_obj = CreateMessage(exception, location);
1570 1358644 : thread_local_top()->pending_message_obj_ = *message_obj;
1571 :
1572 : // For any exception not caught by JavaScript, even when an external
1573 : // handler is present:
1574 : // If the abort-on-uncaught-exception flag is specified, and if the
1575 : // embedder didn't specify a custom uncaught exception callback,
1576 : // or if the custom callback determined that V8 should abort, then
1577 : // abort.
1578 1358644 : if (FLAG_abort_on_uncaught_exception) {
1579 5 : CatchType prediction = PredictExceptionCatcher();
1580 15 : if ((prediction == NOT_CAUGHT || prediction == CAUGHT_BY_EXTERNAL) &&
1581 10 : (!abort_on_uncaught_exception_callback_ ||
1582 5 : abort_on_uncaught_exception_callback_(
1583 : reinterpret_cast<v8::Isolate*>(this)))) {
1584 : // Prevent endless recursion.
1585 0 : FLAG_abort_on_uncaught_exception = false;
1586 : // This flag is intended for use by JavaScript developers, so
1587 : // print a user-friendly stack trace (not an internal one).
1588 : PrintF(stderr, "%s\n\nFROM\n",
1589 0 : MessageHandler::GetLocalizedMessage(this, message_obj).get());
1590 0 : PrintCurrentStackTrace(stderr);
1591 0 : base::OS::Abort();
1592 : }
1593 : }
1594 : }
1595 : }
1596 :
1597 : // Set the exception being thrown.
1598 : set_pending_exception(*exception);
1599 2819588 : return ReadOnlyRoots(heap()).exception();
1600 : }
1601 :
1602 83904 : Object Isolate::ReThrow(Object exception) {
1603 : DCHECK(!has_pending_exception());
1604 :
1605 : // Set the exception being re-thrown.
1606 : set_pending_exception(exception);
1607 83904 : return ReadOnlyRoots(heap()).exception();
1608 : }
1609 :
1610 1311088 : Object Isolate::UnwindAndFindHandler() {
1611 1311088 : Object exception = pending_exception();
1612 :
1613 : auto FoundHandler = [&](Context context, Address instruction_start,
1614 : intptr_t handler_offset,
1615 : Address constant_pool_address, Address handler_sp,
1616 : Address handler_fp) {
1617 : // Store information to be consumed by the CEntry.
1618 1311088 : thread_local_top()->pending_handler_context_ = context;
1619 : thread_local_top()->pending_handler_entrypoint_ =
1620 1311088 : instruction_start + handler_offset;
1621 1311088 : thread_local_top()->pending_handler_constant_pool_ = constant_pool_address;
1622 1311088 : thread_local_top()->pending_handler_fp_ = handler_fp;
1623 1311088 : thread_local_top()->pending_handler_sp_ = handler_sp;
1624 :
1625 : // Return and clear pending exception.
1626 : clear_pending_exception();
1627 1311088 : return exception;
1628 : };
1629 :
1630 : // Special handling of termination exceptions, uncatchable by JavaScript and
1631 : // Wasm code, we unwind the handlers until the top ENTRY handler is found.
1632 : bool catchable_by_js = is_catchable_by_javascript(exception);
1633 :
1634 : // Compute handler and stack unwinding information by performing a full walk
1635 : // over the stack and dispatching according to the frame type.
1636 22840103 : for (StackFrameIterator iter(this);; iter.Advance()) {
1637 : // Handler must exist.
1638 : DCHECK(!iter.done());
1639 :
1640 : StackFrame* frame = iter.frame();
1641 :
1642 22840103 : switch (frame->type()) {
1643 : case StackFrame::ENTRY:
1644 : case StackFrame::CONSTRUCT_ENTRY: {
1645 : // For JSEntry frames we always have a handler.
1646 : StackHandler* handler = frame->top_handler();
1647 :
1648 : // Restore the next handler.
1649 118860 : thread_local_top()->handler_ = handler->next_address();
1650 :
1651 : // Gather information from the handler.
1652 118860 : Code code = frame->LookupCode();
1653 118860 : HandlerTable table(code);
1654 : return FoundHandler(Context(), code->InstructionStart(),
1655 118860 : table.LookupReturn(0), code->constant_pool(),
1656 : handler->address() + StackHandlerConstants::kSize,
1657 118860 : 0);
1658 : }
1659 :
1660 : case StackFrame::WASM_COMPILED: {
1661 2464811 : if (trap_handler::IsThreadInWasm()) {
1662 : trap_handler::ClearThreadInWasm();
1663 : }
1664 :
1665 : // For WebAssembly frames we perform a lookup in the handler table.
1666 2464811 : if (!catchable_by_js) break;
1667 : WasmCompiledFrame* wasm_frame = static_cast<WasmCompiledFrame*>(frame);
1668 2464803 : int stack_slots = 0; // Will contain stack slot count of frame.
1669 2464803 : int offset = wasm_frame->LookupExceptionHandlerInTable(&stack_slots);
1670 2464803 : if (offset < 0) break;
1671 : // Compute the stack pointer from the frame pointer. This ensures that
1672 : // argument slots on the stack are dropped as returning would.
1673 : Address return_sp = frame->fp() +
1674 656 : StandardFrameConstants::kFixedFrameSizeAboveFp -
1675 1312 : stack_slots * kSystemPointerSize;
1676 :
1677 : // This is going to be handled by Wasm, so we need to set the TLS flag
1678 : // again. It was cleared above assuming the frame would be unwound.
1679 : trap_handler::SetThreadInWasm();
1680 :
1681 : // Gather information from the frame.
1682 : wasm::WasmCode* wasm_code =
1683 656 : wasm_engine()->code_manager()->LookupCode(frame->pc());
1684 : return FoundHandler(Context(), wasm_code->instruction_start(), offset,
1685 656 : wasm_code->constant_pool(), return_sp, frame->fp());
1686 : }
1687 :
1688 : case StackFrame::OPTIMIZED: {
1689 : // For optimized frames we perform a lookup in the handler table.
1690 3333011 : if (!catchable_by_js) break;
1691 : OptimizedFrame* js_frame = static_cast<OptimizedFrame*>(frame);
1692 3332630 : int stack_slots = 0; // Will contain stack slot count of frame.
1693 : int offset =
1694 3332630 : js_frame->LookupExceptionHandlerInTable(&stack_slots, nullptr);
1695 3332630 : if (offset < 0) break;
1696 : // Compute the stack pointer from the frame pointer. This ensures
1697 : // that argument slots on the stack are dropped as returning would.
1698 : Address return_sp = frame->fp() +
1699 326961 : StandardFrameConstants::kFixedFrameSizeAboveFp -
1700 653922 : stack_slots * kSystemPointerSize;
1701 :
1702 : // Gather information from the frame.
1703 326961 : Code code = frame->LookupCode();
1704 :
1705 : // TODO(bmeurer): Turbofanned BUILTIN frames appear as OPTIMIZED,
1706 : // but do not have a code kind of OPTIMIZED_FUNCTION.
1707 581482 : if (code->kind() == Code::OPTIMIZED_FUNCTION &&
1708 254521 : code->marked_for_deoptimization()) {
1709 : // If the target code is lazy deoptimized, we jump to the original
1710 : // return address, but we make a note that we are throwing, so
1711 : // that the deoptimizer can do the right thing.
1712 10736 : offset = static_cast<int>(frame->pc() - code->entry());
1713 : set_deoptimizer_lazy_throw(true);
1714 : }
1715 :
1716 : return FoundHandler(Context(), code->InstructionStart(), offset,
1717 326961 : code->constant_pool(), return_sp, frame->fp());
1718 : }
1719 :
1720 : case StackFrame::STUB: {
1721 : // Some stubs are able to handle exceptions.
1722 1043877 : if (!catchable_by_js) break;
1723 : StubFrame* stub_frame = static_cast<StubFrame*>(frame);
1724 : wasm::WasmCode* wasm_code =
1725 1042521 : wasm_engine()->code_manager()->LookupCode(frame->pc());
1726 1042521 : if (wasm_code != nullptr) {
1727 : // It is safe to skip Wasm runtime stubs as none of them contain local
1728 : // exception handlers.
1729 0 : CHECK_EQ(wasm::WasmCode::kRuntimeStub, wasm_code->kind());
1730 0 : CHECK_EQ(0, wasm_code->handler_table_offset());
1731 : break;
1732 : }
1733 1042521 : Code code = stub_frame->LookupCode();
1734 2523277 : if (!code->IsCode() || code->kind() != Code::BUILTIN ||
1735 1526360 : !code->has_handler_table() || !code->is_turbofanned()) {
1736 : break;
1737 : }
1738 :
1739 45604 : int stack_slots = 0; // Will contain stack slot count of frame.
1740 45604 : int offset = stub_frame->LookupExceptionHandlerInTable(&stack_slots);
1741 45604 : if (offset < 0) break;
1742 :
1743 : // Compute the stack pointer from the frame pointer. This ensures
1744 : // that argument slots on the stack are dropped as returning would.
1745 : Address return_sp = frame->fp() +
1746 45604 : StandardFrameConstants::kFixedFrameSizeAboveFp -
1747 91208 : stack_slots * kSystemPointerSize;
1748 :
1749 : return FoundHandler(Context(), code->InstructionStart(), offset,
1750 45604 : code->constant_pool(), return_sp, frame->fp());
1751 : }
1752 :
1753 : case StackFrame::INTERPRETED: {
1754 : // For interpreted frame we perform a range lookup in the handler table.
1755 13456928 : if (!catchable_by_js) break;
1756 : InterpretedFrame* js_frame = static_cast<InterpretedFrame*>(frame);
1757 : int register_slots = InterpreterFrameConstants::RegisterStackSlotCount(
1758 26906732 : js_frame->GetBytecodeArray()->register_count());
1759 13453366 : int context_reg = 0; // Will contain register index holding context.
1760 : int offset =
1761 13453366 : js_frame->LookupExceptionHandlerInTable(&context_reg, nullptr);
1762 13453366 : if (offset < 0) break;
1763 : // Compute the stack pointer from the frame pointer. This ensures that
1764 : // argument slots on the stack are dropped as returning would.
1765 : // Note: This is only needed for interpreted frames that have been
1766 : // materialized by the deoptimizer. If there is a handler frame
1767 : // in between then {frame->sp()} would already be correct.
1768 : Address return_sp = frame->fp() -
1769 818999 : InterpreterFrameConstants::kFixedFrameSizeFromFp -
1770 1637998 : register_slots * kSystemPointerSize;
1771 :
1772 : // Patch the bytecode offset in the interpreted frame to reflect the
1773 : // position of the exception handler. The special builtin below will
1774 : // take care of continuing to dispatch at that position. Also restore
1775 : // the correct context for the handler from the interpreter register.
1776 : Context context =
1777 818999 : Context::cast(js_frame->ReadInterpreterRegister(context_reg));
1778 818999 : js_frame->PatchBytecodeOffset(static_cast<int>(offset));
1779 :
1780 : Code code =
1781 818999 : builtins()->builtin(Builtins::kInterpreterEnterBytecodeDispatch);
1782 : return FoundHandler(context, code->InstructionStart(), 0,
1783 1637998 : code->constant_pool(), return_sp, frame->fp());
1784 : }
1785 :
1786 : case StackFrame::BUILTIN:
1787 : // For builtin frames we are guaranteed not to find a handler.
1788 0 : if (catchable_by_js) {
1789 0 : CHECK_EQ(-1,
1790 : JavaScriptFrame::cast(frame)->LookupExceptionHandlerInTable(
1791 : nullptr, nullptr));
1792 : }
1793 : break;
1794 :
1795 : case StackFrame::WASM_INTERPRETER_ENTRY: {
1796 1761 : if (trap_handler::IsThreadInWasm()) {
1797 : trap_handler::ClearThreadInWasm();
1798 : }
1799 : } break;
1800 :
1801 : case StackFrame::JAVA_SCRIPT_BUILTIN_CONTINUATION_WITH_CATCH: {
1802 : // Builtin continuation frames with catch can handle exceptions.
1803 8 : if (!catchable_by_js) break;
1804 : JavaScriptBuiltinContinuationWithCatchFrame* js_frame =
1805 : JavaScriptBuiltinContinuationWithCatchFrame::cast(frame);
1806 8 : js_frame->SetException(exception);
1807 :
1808 : // Reconstruct the stack pointer from the frame pointer.
1809 8 : Address return_sp = js_frame->fp() - js_frame->GetSPToFPDelta();
1810 8 : Code code = js_frame->LookupCode();
1811 : return FoundHandler(Context(), code->InstructionStart(), 0,
1812 8 : code->constant_pool(), return_sp, frame->fp());
1813 : } break;
1814 :
1815 : default:
1816 : // All other types can not handle exception.
1817 : break;
1818 : }
1819 :
1820 21529015 : if (frame->is_optimized()) {
1821 : // Remove per-frame stored materialized objects.
1822 3006050 : bool removed = materialized_object_store_->Remove(frame->fp());
1823 : USE(removed);
1824 : // If there were any materialized objects, the code should be
1825 : // marked for deopt.
1826 : DCHECK_IMPLIES(removed, frame->LookupCode()->marked_for_deoptimization());
1827 : }
1828 : }
1829 :
1830 : UNREACHABLE();
1831 : }
1832 :
1833 : namespace {
1834 310340 : HandlerTable::CatchPrediction PredictException(JavaScriptFrame* frame) {
1835 : HandlerTable::CatchPrediction prediction;
1836 620680 : if (frame->is_optimized()) {
1837 45542 : if (frame->LookupExceptionHandlerInTable(nullptr, nullptr) > 0) {
1838 : // This optimized frame will catch. It's handler table does not include
1839 : // exception prediction, and we need to use the corresponding handler
1840 : // tables on the unoptimized code objects.
1841 101 : std::vector<FrameSummary> summaries;
1842 1366 : frame->Summarize(&summaries);
1843 1582 : for (size_t i = summaries.size(); i != 0; i--) {
1844 1373 : const FrameSummary& summary = summaries[i - 1];
1845 : Handle<AbstractCode> code = summary.AsJavaScript().abstract_code();
1846 1875 : if (code->IsCode() && code->kind() == AbstractCode::BUILTIN) {
1847 502 : prediction = code->GetCode()->GetBuiltinCatchPrediction();
1848 610 : if (prediction == HandlerTable::UNCAUGHT) continue;
1849 1265 : return prediction;
1850 : }
1851 :
1852 : // Must have been constructed from a bytecode array.
1853 871 : CHECK_EQ(AbstractCode::INTERPRETED_FUNCTION, code->kind());
1854 871 : int code_offset = summary.code_offset();
1855 871 : HandlerTable table(code->GetBytecodeArray());
1856 871 : int index = table.LookupRange(code_offset, nullptr, &prediction);
1857 871 : if (index <= 0) continue;
1858 864 : if (prediction == HandlerTable::UNCAUGHT) continue;
1859 : return prediction;
1860 : }
1861 : }
1862 264798 : } else if (frame->LookupExceptionHandlerInTable(nullptr, &prediction) > 0) {
1863 6149 : return prediction;
1864 : }
1865 : return HandlerTable::UNCAUGHT;
1866 : }
1867 :
1868 159666 : Isolate::CatchType ToCatchType(HandlerTable::CatchPrediction prediction) {
1869 159666 : switch (prediction) {
1870 : case HandlerTable::UNCAUGHT:
1871 : return Isolate::NOT_CAUGHT;
1872 : case HandlerTable::CAUGHT:
1873 2429 : return Isolate::CAUGHT_BY_JAVASCRIPT;
1874 : case HandlerTable::PROMISE:
1875 1261 : return Isolate::CAUGHT_BY_PROMISE;
1876 : case HandlerTable::DESUGARING:
1877 0 : return Isolate::CAUGHT_BY_DESUGARING;
1878 : case HandlerTable::ASYNC_AWAIT:
1879 2102 : return Isolate::CAUGHT_BY_ASYNC_AWAIT;
1880 : default:
1881 0 : UNREACHABLE();
1882 : }
1883 : }
1884 : } // anonymous namespace
1885 :
1886 6283 : Isolate::CatchType Isolate::PredictExceptionCatcher() {
1887 : Address external_handler = thread_local_top()->try_catch_handler_address();
1888 6283 : if (IsExternalHandlerOnTop(Object())) return CAUGHT_BY_EXTERNAL;
1889 :
1890 : // Search for an exception handler by performing a full walk over the stack.
1891 172786 : for (StackFrameIterator iter(this); !iter.done(); iter.Advance()) {
1892 : StackFrame* frame = iter.frame();
1893 :
1894 172454 : switch (frame->type()) {
1895 : case StackFrame::ENTRY:
1896 : case StackFrame::CONSTRUCT_ENTRY: {
1897 : Address entry_handler = frame->top_handler()->next_address();
1898 : // The exception has been externally caught if and only if there is an
1899 : // external handler which is on top of the top-most JS_ENTRY handler.
1900 857 : if (external_handler != kNullAddress &&
1901 351 : !try_catch_handler()->is_verbose_) {
1902 256 : if (entry_handler == kNullAddress ||
1903 128 : entry_handler > external_handler) {
1904 : return CAUGHT_BY_EXTERNAL;
1905 : }
1906 : }
1907 : } break;
1908 :
1909 : // For JavaScript frames we perform a lookup in the handler table.
1910 : case StackFrame::OPTIMIZED:
1911 : case StackFrame::INTERPRETED:
1912 : case StackFrame::BUILTIN: {
1913 : JavaScriptFrame* js_frame = JavaScriptFrame::cast(frame);
1914 158756 : Isolate::CatchType prediction = ToCatchType(PredictException(js_frame));
1915 158756 : if (prediction == NOT_CAUGHT) break;
1916 : return prediction;
1917 : } break;
1918 :
1919 : case StackFrame::STUB: {
1920 5296 : Handle<Code> code(frame->LookupCode(), this);
1921 11502 : if (!code->IsCode() || code->kind() != Code::BUILTIN ||
1922 7116 : !code->has_handler_table() || !code->is_turbofanned()) {
1923 : break;
1924 : }
1925 :
1926 910 : CatchType prediction = ToCatchType(code->GetBuiltinCatchPrediction());
1927 910 : if (prediction != NOT_CAUGHT) return prediction;
1928 : } break;
1929 :
1930 : case StackFrame::JAVA_SCRIPT_BUILTIN_CONTINUATION_WITH_CATCH: {
1931 0 : Handle<Code> code(frame->LookupCode(), this);
1932 0 : CatchType prediction = ToCatchType(code->GetBuiltinCatchPrediction());
1933 0 : if (prediction != NOT_CAUGHT) return prediction;
1934 : } break;
1935 :
1936 : default:
1937 : // All other types can not handle exception.
1938 : break;
1939 : }
1940 : }
1941 :
1942 : // Handler not found.
1943 332 : return NOT_CAUGHT;
1944 : }
1945 :
1946 5 : Object Isolate::ThrowIllegalOperation() {
1947 5 : if (FLAG_stack_trace_on_illegal) PrintStack(stdout);
1948 5 : return Throw(ReadOnlyRoots(heap()).illegal_access_string());
1949 : }
1950 :
1951 30048 : void Isolate::ScheduleThrow(Object exception) {
1952 : // When scheduling a throw we first throw the exception to get the
1953 : // error reporting if it is uncaught before rescheduling it.
1954 30048 : Throw(exception);
1955 30048 : PropagatePendingExceptionToExternalTryCatch();
1956 30048 : if (has_pending_exception()) {
1957 30048 : thread_local_top()->scheduled_exception_ = pending_exception();
1958 30048 : thread_local_top()->external_caught_exception_ = false;
1959 : clear_pending_exception();
1960 : }
1961 30048 : }
1962 :
1963 121 : void Isolate::RestorePendingMessageFromTryCatch(v8::TryCatch* handler) {
1964 : DCHECK(handler == try_catch_handler());
1965 : DCHECK(handler->HasCaught());
1966 : DCHECK(handler->rethrow_);
1967 : DCHECK(handler->capture_message_);
1968 121 : Object message(reinterpret_cast<Address>(handler->message_obj_));
1969 : DCHECK(message->IsJSMessageObject() || message->IsTheHole(this));
1970 121 : thread_local_top()->pending_message_obj_ = message;
1971 121 : }
1972 :
1973 :
1974 273 : void Isolate::CancelScheduledExceptionFromTryCatch(v8::TryCatch* handler) {
1975 : DCHECK(has_scheduled_exception());
1976 546 : if (reinterpret_cast<void*>(scheduled_exception().ptr()) ==
1977 273 : handler->exception_) {
1978 : DCHECK_NE(scheduled_exception(),
1979 : ReadOnlyRoots(heap()).termination_exception());
1980 : clear_scheduled_exception();
1981 : } else {
1982 : DCHECK_EQ(scheduled_exception(),
1983 : ReadOnlyRoots(heap()).termination_exception());
1984 : // Clear termination once we returned from all V8 frames.
1985 183 : if (handle_scope_implementer()->CallDepthIsZero()) {
1986 133 : thread_local_top()->external_caught_exception_ = false;
1987 : clear_scheduled_exception();
1988 : }
1989 : }
1990 546 : if (reinterpret_cast<void*>(thread_local_top()->pending_message_obj_.ptr()) ==
1991 273 : handler->message_obj_) {
1992 : clear_pending_message();
1993 : }
1994 273 : }
1995 :
1996 31576 : Object Isolate::PromoteScheduledException() {
1997 : Object thrown = scheduled_exception();
1998 : clear_scheduled_exception();
1999 : // Re-throw the exception to avoid getting repeated error reporting.
2000 31576 : return ReThrow(thrown);
2001 : }
2002 :
2003 0 : void Isolate::PrintCurrentStackTrace(FILE* out) {
2004 0 : IncrementalStringBuilder builder(this);
2005 0 : for (StackTraceFrameIterator it(this); !it.done(); it.Advance()) {
2006 0 : if (!it.is_javascript()) continue;
2007 :
2008 : HandleScope scope(this);
2009 : JavaScriptFrame* frame = it.javascript_frame();
2010 :
2011 0 : Handle<Object> receiver(frame->receiver(), this);
2012 0 : Handle<JSFunction> function(frame->function(), this);
2013 : Handle<AbstractCode> code;
2014 : int offset;
2015 0 : if (frame->is_interpreted()) {
2016 : InterpretedFrame* interpreted_frame = InterpretedFrame::cast(frame);
2017 0 : code = handle(AbstractCode::cast(interpreted_frame->GetBytecodeArray()),
2018 : this);
2019 0 : offset = interpreted_frame->GetBytecodeOffset();
2020 : } else {
2021 0 : code = handle(AbstractCode::cast(frame->LookupCode()), this);
2022 0 : offset = static_cast<int>(frame->pc() - code->InstructionStart());
2023 : }
2024 :
2025 : // To preserve backwards compatiblity, only append a newline when
2026 : // the current stringified frame actually has characters.
2027 0 : const int old_length = builder.Length();
2028 0 : JSStackFrame site(this, receiver, function, code, offset);
2029 0 : site.ToString(builder);
2030 0 : if (old_length != builder.Length()) builder.AppendCharacter('\n');
2031 : }
2032 :
2033 0 : Handle<String> stack_trace = builder.Finish().ToHandleChecked();
2034 0 : stack_trace->PrintOn(out);
2035 0 : }
2036 :
2037 978234 : bool Isolate::ComputeLocation(MessageLocation* target) {
2038 978234 : StackTraceFrameIterator it(this);
2039 978234 : if (it.done()) return false;
2040 : StandardFrame* frame = it.frame();
2041 : // Compute the location from the function and the relocation info of the
2042 : // baseline code. For optimized code this will use the deoptimization
2043 : // information to get canonical location information.
2044 970365 : std::vector<FrameSummary> frames;
2045 970365 : frame->Summarize(&frames);
2046 : FrameSummary& summary = frames.back();
2047 970365 : int pos = summary.SourcePosition();
2048 : Handle<SharedFunctionInfo> shared;
2049 970365 : Handle<Object> script = summary.script();
2050 1940414 : if (!script->IsScript() ||
2051 : (Script::cast(*script)->source()->IsUndefined(this))) {
2052 : return false;
2053 : }
2054 :
2055 970049 : if (summary.IsJavaScript()) {
2056 820026 : shared = handle(summary.AsJavaScript().function()->shared(), this);
2057 : }
2058 970049 : *target = MessageLocation(Handle<Script>::cast(script), pos, pos + 1, shared);
2059 970049 : return true;
2060 : }
2061 :
2062 4562 : bool Isolate::ComputeLocationFromException(MessageLocation* target,
2063 : Handle<Object> exception) {
2064 4562 : if (!exception->IsJSObject()) return false;
2065 :
2066 : Handle<Name> start_pos_symbol = factory()->error_start_pos_symbol();
2067 : Handle<Object> start_pos = JSReceiver::GetDataProperty(
2068 2629 : Handle<JSObject>::cast(exception), start_pos_symbol);
2069 2629 : if (!start_pos->IsSmi()) return false;
2070 : int start_pos_value = Handle<Smi>::cast(start_pos)->value();
2071 :
2072 : Handle<Name> end_pos_symbol = factory()->error_end_pos_symbol();
2073 : Handle<Object> end_pos = JSReceiver::GetDataProperty(
2074 15 : Handle<JSObject>::cast(exception), end_pos_symbol);
2075 15 : if (!end_pos->IsSmi()) return false;
2076 : int end_pos_value = Handle<Smi>::cast(end_pos)->value();
2077 :
2078 : Handle<Name> script_symbol = factory()->error_script_symbol();
2079 : Handle<Object> script = JSReceiver::GetDataProperty(
2080 15 : Handle<JSObject>::cast(exception), script_symbol);
2081 15 : if (!script->IsScript()) return false;
2082 :
2083 : Handle<Script> cast_script(Script::cast(*script), this);
2084 15 : *target = MessageLocation(cast_script, start_pos_value, end_pos_value);
2085 15 : return true;
2086 : }
2087 :
2088 :
2089 4583 : bool Isolate::ComputeLocationFromStackTrace(MessageLocation* target,
2090 : Handle<Object> exception) {
2091 4583 : if (!exception->IsJSObject()) return false;
2092 : Handle<Name> key = factory()->stack_trace_symbol();
2093 : Handle<Object> property =
2094 2650 : JSReceiver::GetDataProperty(Handle<JSObject>::cast(exception), key);
2095 2650 : if (!property->IsJSArray()) return false;
2096 : Handle<JSArray> simple_stack_trace = Handle<JSArray>::cast(property);
2097 :
2098 : Handle<FrameArray> elements(FrameArray::cast(simple_stack_trace->elements()),
2099 : this);
2100 :
2101 : const int frame_count = elements->FrameCount();
2102 3217 : for (int i = 0; i < frame_count; i++) {
2103 3072 : if (elements->IsWasmFrame(i) || elements->IsAsmJsWasmFrame(i)) {
2104 96 : Handle<WasmInstanceObject> instance(elements->WasmInstance(i), this);
2105 : uint32_t func_index =
2106 96 : static_cast<uint32_t>(elements->WasmFunctionIndex(i)->value());
2107 : wasm::WasmCode* wasm_code = reinterpret_cast<wasm::WasmCode*>(
2108 96 : elements->WasmCodeObject(i)->foreign_address());
2109 96 : int code_offset = elements->Offset(i)->value();
2110 : bool is_at_number_conversion =
2111 144 : elements->IsAsmJsWasmFrame(i) &&
2112 48 : elements->Flags(i)->value() & FrameArray::kAsmJsAtNumberConversion;
2113 : int byte_offset =
2114 : FrameSummary::WasmCompiledFrameSummary::GetWasmSourcePosition(
2115 48 : wasm_code, code_offset);
2116 48 : int pos = WasmModuleObject::GetSourcePosition(
2117 : handle(instance->module_object(), this), func_index, byte_offset,
2118 48 : is_at_number_conversion);
2119 : Handle<Script> script(instance->module_object()->script(), this);
2120 :
2121 48 : *target = MessageLocation(script, pos, pos + 1);
2122 : return true;
2123 : }
2124 :
2125 1488 : Handle<JSFunction> fun = handle(elements->Function(i), this);
2126 1060 : if (!fun->shared()->IsSubjectToDebugging()) continue;
2127 :
2128 428 : Object script = fun->shared()->script();
2129 856 : if (script->IsScript() &&
2130 : !(Script::cast(script)->source()->IsUndefined(this))) {
2131 428 : AbstractCode abstract_code = elements->Code(i);
2132 856 : const int code_offset = elements->Offset(i)->value();
2133 428 : const int pos = abstract_code->SourcePosition(code_offset);
2134 :
2135 : Handle<Script> casted_script(Script::cast(script), this);
2136 428 : *target = MessageLocation(casted_script, pos, pos + 1);
2137 : return true;
2138 : }
2139 : }
2140 : return false;
2141 : }
2142 :
2143 :
2144 1359008 : Handle<JSMessageObject> Isolate::CreateMessage(Handle<Object> exception,
2145 : MessageLocation* location) {
2146 : Handle<FixedArray> stack_trace_object;
2147 1359008 : if (capture_stack_trace_for_uncaught_exceptions_) {
2148 452 : if (exception->IsJSError()) {
2149 : // We fetch the stack trace that corresponds to this error object.
2150 : // If the lookup fails, the exception is probably not a valid Error
2151 : // object. In that case, we fall through and capture the stack trace
2152 : // at this throw site.
2153 : stack_trace_object =
2154 271 : GetDetailedStackTrace(Handle<JSObject>::cast(exception));
2155 : }
2156 452 : if (stack_trace_object.is_null()) {
2157 : // Not an error object, we capture stack and location at throw site.
2158 : stack_trace_object = CaptureCurrentStackTrace(
2159 : stack_trace_for_uncaught_exceptions_frame_limit_,
2160 186 : stack_trace_for_uncaught_exceptions_options_);
2161 : }
2162 : }
2163 1359008 : MessageLocation computed_location;
2164 2722578 : if (location == nullptr &&
2165 9109 : (ComputeLocationFromException(&computed_location, exception) ||
2166 8654 : ComputeLocationFromStackTrace(&computed_location, exception) ||
2167 4107 : ComputeLocation(&computed_location))) {
2168 : location = &computed_location;
2169 : }
2170 :
2171 : return MessageHandler::MakeMessageObject(
2172 : this, MessageTemplate::kUncaughtException, location, exception,
2173 1359008 : stack_trace_object);
2174 : }
2175 :
2176 0 : bool Isolate::IsJavaScriptHandlerOnTop(Object exception) {
2177 : DCHECK_NE(ReadOnlyRoots(heap()).the_hole_value(), exception);
2178 :
2179 : // For uncatchable exceptions, the JavaScript handler cannot be on top.
2180 169348 : if (!is_catchable_by_javascript(exception)) return false;
2181 :
2182 : // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist.
2183 : Address entry_handler = Isolate::handler(thread_local_top());
2184 165055 : if (entry_handler == kNullAddress) return false;
2185 :
2186 : // Get the address of the external handler so we can compare the address to
2187 : // determine which one is closer to the top of the stack.
2188 : Address external_handler = thread_local_top()->try_catch_handler_address();
2189 147375 : if (external_handler == kNullAddress) return true;
2190 :
2191 : // The exception has been externally caught if and only if there is an
2192 : // external handler which is on top of the top-most JS_ENTRY handler.
2193 : //
2194 : // Note, that finally clauses would re-throw an exception unless it's aborted
2195 : // by jumps in control flow (like return, break, etc.) and we'll have another
2196 : // chance to set proper v8::TryCatch later.
2197 146007 : return (entry_handler < external_handler);
2198 : }
2199 :
2200 0 : bool Isolate::IsExternalHandlerOnTop(Object exception) {
2201 : DCHECK_NE(ReadOnlyRoots(heap()).the_hole_value(), exception);
2202 :
2203 : // Get the address of the external handler so we can compare the address to
2204 : // determine which one is closer to the top of the stack.
2205 : Address external_handler = thread_local_top()->try_catch_handler_address();
2206 52303 : if (external_handler == kNullAddress) return false;
2207 :
2208 : // For uncatchable exceptions, the external handler is always on top.
2209 45364 : if (!is_catchable_by_javascript(exception)) return true;
2210 :
2211 : // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist.
2212 : Address entry_handler = Isolate::handler(thread_local_top());
2213 41950 : if (entry_handler == kNullAddress) return true;
2214 :
2215 : // The exception has been externally caught if and only if there is an
2216 : // external handler which is on top of the top-most JS_ENTRY handler.
2217 : //
2218 : // Note, that finally clauses would re-throw an exception unless it's aborted
2219 : // by jumps in control flow (like return, break, etc.) and we'll have another
2220 : // chance to set proper v8::TryCatch later.
2221 20121 : return (entry_handler > external_handler);
2222 : }
2223 :
2224 15107 : void Isolate::ReportPendingMessagesImpl(bool report_externally) {
2225 : Object exception = pending_exception();
2226 :
2227 : // Clear the pending message object early to avoid endless recursion.
2228 15107 : Object message_obj = thread_local_top()->pending_message_obj_;
2229 : clear_pending_message();
2230 :
2231 : // For uncatchable exceptions we do nothing. If needed, the exception and the
2232 : // message have already been propagated to v8::TryCatch.
2233 15107 : if (!is_catchable_by_javascript(exception)) return;
2234 :
2235 : // Determine whether the message needs to be reported to all message handlers
2236 : // depending on whether and external v8::TryCatch or an internal JavaScript
2237 : // handler is on top.
2238 : bool should_report_exception;
2239 12336 : if (report_externally) {
2240 : // Only report the exception if the external handler is verbose.
2241 11377 : should_report_exception = try_catch_handler()->is_verbose_;
2242 : } else {
2243 : // Report the exception if it isn't caught by JavaScript code.
2244 959 : should_report_exception = !IsJavaScriptHandlerOnTop(exception);
2245 : }
2246 :
2247 : // Actually report the pending message to all message handlers.
2248 12336 : if (!message_obj->IsTheHole(this) && should_report_exception) {
2249 : HandleScope scope(this);
2250 : Handle<JSMessageObject> message(JSMessageObject::cast(message_obj), this);
2251 : Handle<Script> script(message->script(), this);
2252 : int start_pos = message->start_position();
2253 : int end_pos = message->end_position();
2254 8019 : MessageLocation location(script, start_pos, end_pos);
2255 8019 : MessageHandler::ReportMessage(this, &location, message);
2256 : }
2257 : }
2258 :
2259 121345 : void Isolate::ReportPendingMessages() {
2260 : DCHECK(AllowExceptions::IsAllowed(this));
2261 :
2262 : // The embedder might run script in response to an exception.
2263 : AllowJavascriptExecutionDebugOnly allow_script(this);
2264 :
2265 : Object exception = pending_exception();
2266 :
2267 : // Try to propagate the exception to an external v8::TryCatch handler. If
2268 : // propagation was unsuccessful, then we will get another chance at reporting
2269 : // the pending message if the exception is re-thrown.
2270 121345 : bool has_been_propagated = PropagatePendingExceptionToExternalTryCatch();
2271 121345 : if (!has_been_propagated) return;
2272 :
2273 15107 : ReportPendingMessagesImpl(IsExternalHandlerOnTop(exception));
2274 : }
2275 :
2276 33 : void Isolate::ReportPendingMessagesFromJavaScript() {
2277 : DCHECK(AllowExceptions::IsAllowed(this));
2278 :
2279 : auto IsHandledByJavaScript = [=]() {
2280 : // In this situation, the exception is always a non-terminating exception.
2281 :
2282 : // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist.
2283 33 : Address entry_handler = Isolate::handler(thread_local_top());
2284 : DCHECK_NE(entry_handler, kNullAddress);
2285 : entry_handler = StackHandler::FromAddress(entry_handler)->next_address();
2286 :
2287 : // Get the address of the external handler so we can compare the address to
2288 : // determine which one is closer to the top of the stack.
2289 : Address external_handler = thread_local_top()->try_catch_handler_address();
2290 33 : if (external_handler == kNullAddress) return true;
2291 :
2292 33 : return (entry_handler < external_handler);
2293 : };
2294 :
2295 : auto IsHandledExternally = [=]() {
2296 0 : Address external_handler = thread_local_top()->try_catch_handler_address();
2297 0 : if (external_handler == kNullAddress) return false;
2298 :
2299 : // Get the top-most JS_ENTRY handler, cannot be on top if it doesn't exist.
2300 : Address entry_handler = Isolate::handler(thread_local_top());
2301 : DCHECK_NE(entry_handler, kNullAddress);
2302 : entry_handler = StackHandler::FromAddress(entry_handler)->next_address();
2303 0 : return (entry_handler > external_handler);
2304 : };
2305 :
2306 33 : auto PropagateToExternalHandler = [=]() {
2307 33 : if (IsHandledByJavaScript()) {
2308 33 : thread_local_top()->external_caught_exception_ = false;
2309 33 : return false;
2310 : }
2311 :
2312 0 : if (!IsHandledExternally()) {
2313 0 : thread_local_top()->external_caught_exception_ = false;
2314 0 : return true;
2315 : }
2316 :
2317 0 : thread_local_top()->external_caught_exception_ = true;
2318 : v8::TryCatch* handler = try_catch_handler();
2319 : DCHECK(thread_local_top()->pending_message_obj_->IsJSMessageObject() ||
2320 : thread_local_top()->pending_message_obj_->IsTheHole(this));
2321 0 : handler->can_continue_ = true;
2322 0 : handler->has_terminated_ = false;
2323 0 : handler->exception_ = reinterpret_cast<void*>(pending_exception().ptr());
2324 : // Propagate to the external try-catch only if we got an actual message.
2325 0 : if (thread_local_top()->pending_message_obj_->IsTheHole(this)) return true;
2326 :
2327 : handler->message_obj_ =
2328 0 : reinterpret_cast<void*>(thread_local_top()->pending_message_obj_.ptr());
2329 0 : return true;
2330 33 : };
2331 :
2332 : // Try to propagate to an external v8::TryCatch handler.
2333 66 : if (!PropagateToExternalHandler()) return;
2334 :
2335 0 : ReportPendingMessagesImpl(true);
2336 : }
2337 :
2338 0 : MessageLocation Isolate::GetMessageLocation() {
2339 : DCHECK(has_pending_exception());
2340 :
2341 0 : if (thread_local_top()->pending_exception_ !=
2342 0 : ReadOnlyRoots(heap()).termination_exception() &&
2343 : !thread_local_top()->pending_message_obj_->IsTheHole(this)) {
2344 : Handle<JSMessageObject> message_obj(
2345 : JSMessageObject::cast(thread_local_top()->pending_message_obj_), this);
2346 : Handle<Script> script(message_obj->script(), this);
2347 : int start_pos = message_obj->start_position();
2348 : int end_pos = message_obj->end_position();
2349 0 : return MessageLocation(script, start_pos, end_pos);
2350 : }
2351 :
2352 0 : return MessageLocation();
2353 : }
2354 :
2355 16996 : bool Isolate::OptionalRescheduleException(bool clear_exception) {
2356 : DCHECK(has_pending_exception());
2357 16996 : PropagatePendingExceptionToExternalTryCatch();
2358 :
2359 : bool is_termination_exception =
2360 : pending_exception() == ReadOnlyRoots(this).termination_exception();
2361 :
2362 16996 : if (is_termination_exception) {
2363 1522 : if (clear_exception) {
2364 1080 : thread_local_top()->external_caught_exception_ = false;
2365 : clear_pending_exception();
2366 1080 : return false;
2367 : }
2368 15474 : } else if (thread_local_top()->external_caught_exception_) {
2369 : // If the exception is externally caught, clear it if there are no
2370 : // JavaScript frames on the way to the C++ frame that has the
2371 : // external handler.
2372 : DCHECK_NE(thread_local_top()->try_catch_handler_address(), kNullAddress);
2373 : Address external_handler_address =
2374 : thread_local_top()->try_catch_handler_address();
2375 12945 : JavaScriptFrameIterator it(this);
2376 12945 : if (it.done() || (it.frame()->sp() > external_handler_address)) {
2377 : clear_exception = true;
2378 : }
2379 : }
2380 :
2381 : // Clear the exception if needed.
2382 15916 : if (clear_exception) {
2383 14042 : thread_local_top()->external_caught_exception_ = false;
2384 : clear_pending_exception();
2385 14042 : return false;
2386 : }
2387 :
2388 : // Reschedule the exception.
2389 1874 : thread_local_top()->scheduled_exception_ = pending_exception();
2390 : clear_pending_exception();
2391 1874 : return true;
2392 : }
2393 :
2394 17420 : void Isolate::PushPromise(Handle<JSObject> promise) {
2395 : ThreadLocalTop* tltop = thread_local_top();
2396 17420 : PromiseOnStack* prev = tltop->promise_on_stack_;
2397 : Handle<JSObject> global_promise = global_handles()->Create(*promise);
2398 34840 : tltop->promise_on_stack_ = new PromiseOnStack(global_promise, prev);
2399 17420 : }
2400 :
2401 :
2402 17440 : void Isolate::PopPromise() {
2403 : ThreadLocalTop* tltop = thread_local_top();
2404 17440 : if (tltop->promise_on_stack_ == nullptr) return;
2405 : PromiseOnStack* prev = tltop->promise_on_stack_->prev();
2406 : Handle<Object> global_promise = tltop->promise_on_stack_->promise();
2407 17420 : delete tltop->promise_on_stack_;
2408 17420 : tltop->promise_on_stack_ = prev;
2409 17420 : global_handles()->Destroy(global_promise.location());
2410 : }
2411 :
2412 : namespace {
2413 : bool InternalPromiseHasUserDefinedRejectHandler(Isolate* isolate,
2414 : Handle<JSPromise> promise);
2415 :
2416 985 : bool PromiseHandlerCheck(Isolate* isolate, Handle<JSReceiver> handler,
2417 : Handle<JSReceiver> deferred_promise) {
2418 : // Recurse to the forwarding Promise, if any. This may be due to
2419 : // - await reaction forwarding to the throwaway Promise, which has
2420 : // a dependency edge to the outer Promise.
2421 : // - PromiseIdResolveHandler forwarding to the output of .then
2422 : // - Promise.all/Promise.race forwarding to a throwaway Promise, which
2423 : // has a dependency edge to the generated outer Promise.
2424 : // Otherwise, this is a real reject handler for the Promise.
2425 : Handle<Symbol> key = isolate->factory()->promise_forwarding_handler_symbol();
2426 985 : Handle<Object> forwarding_handler = JSReceiver::GetDataProperty(handler, key);
2427 985 : if (forwarding_handler->IsUndefined(isolate)) {
2428 : return true;
2429 : }
2430 :
2431 365 : if (!deferred_promise->IsJSPromise()) {
2432 : return true;
2433 : }
2434 :
2435 : return InternalPromiseHasUserDefinedRejectHandler(
2436 365 : isolate, Handle<JSPromise>::cast(deferred_promise));
2437 : }
2438 :
2439 4876 : bool InternalPromiseHasUserDefinedRejectHandler(Isolate* isolate,
2440 : Handle<JSPromise> promise) {
2441 : // If this promise was marked as being handled by a catch block
2442 : // in an async function, then it has a user-defined reject handler.
2443 4876 : if (promise->handled_hint()) return true;
2444 :
2445 : // If this Promise is subsumed by another Promise (a Promise resolved
2446 : // with another Promise, or an intermediate, hidden, throwaway Promise
2447 : // within async/await), then recurse on the outer Promise.
2448 : // In this case, the dependency is one possible way that the Promise
2449 : // could be resolved, so it does not subsume the other following cases.
2450 : Handle<Symbol> key = isolate->factory()->promise_handled_by_symbol();
2451 4330 : Handle<Object> outer_promise_obj = JSObject::GetDataProperty(promise, key);
2452 5333 : if (outer_promise_obj->IsJSPromise() &&
2453 1003 : InternalPromiseHasUserDefinedRejectHandler(
2454 : isolate, Handle<JSPromise>::cast(outer_promise_obj))) {
2455 : return true;
2456 : }
2457 :
2458 3608 : if (promise->status() == Promise::kPending) {
2459 3797 : for (Handle<Object> current(promise->reactions(), isolate);
2460 : !current->IsSmi();) {
2461 : Handle<PromiseReaction> reaction = Handle<PromiseReaction>::cast(current);
2462 : Handle<HeapObject> promise_or_capability(
2463 : reaction->promise_or_capability(), isolate);
2464 1076 : if (!promise_or_capability->IsUndefined(isolate)) {
2465 : Handle<JSPromise> promise = Handle<JSPromise>::cast(
2466 : promise_or_capability->IsJSPromise()
2467 : ? promise_or_capability
2468 : : handle(Handle<PromiseCapability>::cast(promise_or_capability)
2469 : ->promise(),
2470 1076 : isolate));
2471 1076 : if (reaction->reject_handler()->IsUndefined(isolate)) {
2472 91 : if (InternalPromiseHasUserDefinedRejectHandler(isolate, promise)) {
2473 : return true;
2474 : }
2475 : } else {
2476 : Handle<JSReceiver> current_handler(
2477 : JSReceiver::cast(reaction->reject_handler()), isolate);
2478 985 : if (PromiseHandlerCheck(isolate, current_handler, promise)) {
2479 805 : return true;
2480 : }
2481 : }
2482 : }
2483 : current = handle(reaction->next(), isolate);
2484 : }
2485 : }
2486 :
2487 : return false;
2488 : }
2489 :
2490 : } // namespace
2491 :
2492 3417 : bool Isolate::PromiseHasUserDefinedRejectHandler(Handle<Object> promise) {
2493 3417 : if (!promise->IsJSPromise()) return false;
2494 : return InternalPromiseHasUserDefinedRejectHandler(
2495 3417 : this, Handle<JSPromise>::cast(promise));
2496 : }
2497 :
2498 4206 : Handle<Object> Isolate::GetPromiseOnStackOnThrow() {
2499 : Handle<Object> undefined = factory()->undefined_value();
2500 : ThreadLocalTop* tltop = thread_local_top();
2501 4206 : if (tltop->promise_on_stack_ == nullptr) return undefined;
2502 : // Find the top-most try-catch or try-finally handler.
2503 1593 : CatchType prediction = PredictExceptionCatcher();
2504 1593 : if (prediction == NOT_CAUGHT || prediction == CAUGHT_BY_EXTERNAL) {
2505 5 : return undefined;
2506 : }
2507 : Handle<Object> retval = undefined;
2508 1588 : PromiseOnStack* promise_on_stack = tltop->promise_on_stack_;
2509 156672 : for (StackFrameIterator it(this); !it.done(); it.Advance()) {
2510 : StackFrame* frame = it.frame();
2511 : HandlerTable::CatchPrediction catch_prediction;
2512 156262 : if (frame->is_java_script()) {
2513 151584 : catch_prediction = PredictException(JavaScriptFrame::cast(frame));
2514 4678 : } else if (frame->type() == StackFrame::STUB) {
2515 1621 : Code code = frame->LookupCode();
2516 3650 : if (!code->IsCode() || code->kind() != Code::BUILTIN ||
2517 2437 : !code->has_handler_table() || !code->is_turbofanned()) {
2518 1213 : continue;
2519 : }
2520 408 : catch_prediction = code->GetBuiltinCatchPrediction();
2521 : } else {
2522 : continue;
2523 : }
2524 :
2525 151992 : switch (catch_prediction) {
2526 : case HandlerTable::UNCAUGHT:
2527 : continue;
2528 : case HandlerTable::CAUGHT:
2529 : case HandlerTable::DESUGARING:
2530 462 : if (retval->IsJSPromise()) {
2531 : // Caught the result of an inner async/await invocation.
2532 : // Mark the inner promise as caught in the "synchronous case" so
2533 : // that Debug::OnException will see. In the synchronous case,
2534 : // namely in the code in an async function before the first
2535 : // await, the function which has this exception event has not yet
2536 : // returned, so the generated Promise has not yet been marked
2537 : // by AsyncFunctionAwaitCaught with promiseHandledHintSymbol.
2538 325 : Handle<JSPromise>::cast(retval)->set_handled_hint(true);
2539 : }
2540 462 : return retval;
2541 : case HandlerTable::PROMISE:
2542 : return promise_on_stack
2543 : ? Handle<Object>::cast(promise_on_stack->promise())
2544 482 : : undefined;
2545 : case HandlerTable::ASYNC_AWAIT: {
2546 : // If in the initial portion of async/await, continue the loop to pop up
2547 : // successive async/await stack frames until an asynchronous one with
2548 : // dependents is found, or a non-async stack frame is encountered, in
2549 : // order to handle the synchronous async/await catch prediction case:
2550 : // assume that async function calls are awaited.
2551 1474 : if (!promise_on_stack) return retval;
2552 : retval = promise_on_stack->promise();
2553 1474 : if (PromiseHasUserDefinedRejectHandler(retval)) {
2554 234 : return retval;
2555 : }
2556 : promise_on_stack = promise_on_stack->prev();
2557 1240 : continue;
2558 : }
2559 : }
2560 : }
2561 410 : return retval;
2562 : }
2563 :
2564 :
2565 1371 : void Isolate::SetCaptureStackTraceForUncaughtExceptions(
2566 : bool capture,
2567 : int frame_limit,
2568 : StackTrace::StackTraceOptions options) {
2569 1371 : capture_stack_trace_for_uncaught_exceptions_ = capture;
2570 1371 : stack_trace_for_uncaught_exceptions_frame_limit_ = frame_limit;
2571 1371 : stack_trace_for_uncaught_exceptions_options_ = options;
2572 1371 : }
2573 :
2574 :
2575 5 : void Isolate::SetAbortOnUncaughtExceptionCallback(
2576 : v8::Isolate::AbortOnUncaughtExceptionCallback callback) {
2577 5 : abort_on_uncaught_exception_callback_ = callback;
2578 5 : }
2579 :
2580 1536548 : bool Isolate::AreWasmThreadsEnabled(Handle<Context> context) {
2581 1536548 : if (wasm_threads_enabled_callback()) {
2582 42 : v8::Local<v8::Context> api_context = v8::Utils::ToLocal(context);
2583 42 : return wasm_threads_enabled_callback()(api_context);
2584 : }
2585 1536506 : return FLAG_experimental_wasm_threads;
2586 : }
2587 :
2588 4 : Handle<Context> Isolate::GetIncumbentContext() {
2589 4 : JavaScriptFrameIterator it(this);
2590 :
2591 : // 1st candidate: most-recently-entered author function's context
2592 : // if it's newer than the last Context::BackupIncumbentScope entry.
2593 : //
2594 : // NOTE: This code assumes that the stack grows downward.
2595 : Address top_backup_incumbent =
2596 : top_backup_incumbent_scope()
2597 : ? top_backup_incumbent_scope()->JSStackComparableAddress()
2598 4 : : 0;
2599 8 : if (!it.done() &&
2600 2 : (!top_backup_incumbent || it.frame()->sp() < top_backup_incumbent)) {
2601 4 : Context context = Context::cast(it.frame()->context());
2602 8 : return Handle<Context>(context->native_context(), this);
2603 : }
2604 :
2605 : // 2nd candidate: the last Context::Scope's incumbent context if any.
2606 0 : if (top_backup_incumbent_scope()) {
2607 : return Utils::OpenHandle(
2608 : *top_backup_incumbent_scope()->backup_incumbent_context_);
2609 : }
2610 :
2611 : // Last candidate: the entered context or microtask context.
2612 : // Given that there is no other author function is running, there must be
2613 : // no cross-context function running, then the incumbent realm must match
2614 : // the entry realm.
2615 : v8::Local<v8::Context> entered_context =
2616 0 : reinterpret_cast<v8::Isolate*>(this)->GetEnteredOrMicrotaskContext();
2617 : return Utils::OpenHandle(*entered_context);
2618 : }
2619 :
2620 32437 : char* Isolate::ArchiveThread(char* to) {
2621 : MemCopy(to, reinterpret_cast<char*>(thread_local_top()),
2622 : sizeof(ThreadLocalTop));
2623 : InitializeThreadLocal();
2624 : clear_pending_exception();
2625 : clear_pending_message();
2626 : clear_scheduled_exception();
2627 32437 : return to + sizeof(ThreadLocalTop);
2628 : }
2629 :
2630 :
2631 32437 : char* Isolate::RestoreThread(char* from) {
2632 : MemCopy(reinterpret_cast<char*>(thread_local_top()), from,
2633 : sizeof(ThreadLocalTop));
2634 : // This might be just paranoia, but it seems to be needed in case a
2635 : // thread_local_top_ is restored on a separate OS thread.
2636 : #ifdef USE_SIMULATOR
2637 : thread_local_top()->simulator_ = Simulator::current(this);
2638 : #endif
2639 : DCHECK(context().is_null() || context()->IsContext());
2640 32437 : return from + sizeof(ThreadLocalTop);
2641 : }
2642 :
2643 61517 : void Isolate::ReleaseSharedPtrs() {
2644 61517 : base::MutexGuard lock(&managed_ptr_destructors_mutex_);
2645 72991 : while (managed_ptr_destructors_head_) {
2646 : ManagedPtrDestructor* l = managed_ptr_destructors_head_;
2647 : ManagedPtrDestructor* n = nullptr;
2648 11472 : managed_ptr_destructors_head_ = nullptr;
2649 733414 : for (; l != nullptr; l = n) {
2650 360971 : l->destructor_(l->shared_ptr_ptr_);
2651 360971 : n = l->next_;
2652 360971 : delete l;
2653 : }
2654 : }
2655 61519 : }
2656 :
2657 2961681 : void Isolate::RegisterManagedPtrDestructor(ManagedPtrDestructor* destructor) {
2658 2961681 : base::MutexGuard lock(&managed_ptr_destructors_mutex_);
2659 : DCHECK_NULL(destructor->prev_);
2660 : DCHECK_NULL(destructor->next_);
2661 2961686 : if (managed_ptr_destructors_head_) {
2662 2948960 : managed_ptr_destructors_head_->prev_ = destructor;
2663 : }
2664 2961686 : destructor->next_ = managed_ptr_destructors_head_;
2665 2961686 : managed_ptr_destructors_head_ = destructor;
2666 2961686 : }
2667 :
2668 2600715 : void Isolate::UnregisterManagedPtrDestructor(ManagedPtrDestructor* destructor) {
2669 2600715 : base::MutexGuard lock(&managed_ptr_destructors_mutex_);
2670 2600715 : if (destructor->prev_) {
2671 2581649 : destructor->prev_->next_ = destructor->next_;
2672 : } else {
2673 : DCHECK_EQ(destructor, managed_ptr_destructors_head_);
2674 19066 : managed_ptr_destructors_head_ = destructor->next_;
2675 : }
2676 2600715 : if (destructor->next_) destructor->next_->prev_ = destructor->prev_;
2677 2600715 : destructor->prev_ = nullptr;
2678 2600715 : destructor->next_ = nullptr;
2679 2600715 : }
2680 :
2681 61534 : void Isolate::SetWasmEngine(std::shared_ptr<wasm::WasmEngine> engine) {
2682 : DCHECK_NULL(wasm_engine_); // Only call once before {Init}.
2683 : wasm_engine_ = std::move(engine);
2684 61534 : wasm_engine_->AddIsolate(this);
2685 61534 : }
2686 :
2687 : // NOLINTNEXTLINE
2688 67054 : Isolate::PerIsolateThreadData::~PerIsolateThreadData() {
2689 : #if defined(USE_SIMULATOR)
2690 : delete simulator_;
2691 : #endif
2692 0 : }
2693 :
2694 0 : Isolate::PerIsolateThreadData* Isolate::ThreadDataTable::Lookup(
2695 : ThreadId thread_id) {
2696 : auto t = table_.find(thread_id);
2697 366865 : if (t == table_.end()) return nullptr;
2698 293761 : return t->second;
2699 : }
2700 :
2701 :
2702 67069 : void Isolate::ThreadDataTable::Insert(Isolate::PerIsolateThreadData* data) {
2703 134137 : bool inserted = table_.insert(std::make_pair(data->thread_id_, data)).second;
2704 67068 : CHECK(inserted);
2705 67068 : }
2706 :
2707 :
2708 0 : void Isolate::ThreadDataTable::Remove(PerIsolateThreadData* data) {
2709 500 : table_.erase(data->thread_id_);
2710 1000 : delete data;
2711 0 : }
2712 :
2713 61519 : void Isolate::ThreadDataTable::RemoveAllThreads() {
2714 128073 : for (auto& x : table_) {
2715 133108 : delete x.second;
2716 : }
2717 : table_.clear();
2718 61518 : }
2719 :
2720 0 : class VerboseAccountingAllocator : public AccountingAllocator {
2721 : public:
2722 : VerboseAccountingAllocator(Heap* heap, size_t allocation_sample_bytes)
2723 0 : : heap_(heap), allocation_sample_bytes_(allocation_sample_bytes) {}
2724 :
2725 0 : v8::internal::Segment* AllocateSegment(size_t size) override {
2726 0 : v8::internal::Segment* memory = AccountingAllocator::AllocateSegment(size);
2727 0 : if (!memory) return nullptr;
2728 : size_t malloced_current = GetCurrentMemoryUsage();
2729 :
2730 0 : if (last_memory_usage_ + allocation_sample_bytes_ < malloced_current) {
2731 0 : PrintMemoryJSON(malloced_current);
2732 : last_memory_usage_ = malloced_current;
2733 : }
2734 : return memory;
2735 : }
2736 :
2737 0 : void ReturnSegment(v8::internal::Segment* memory) override {
2738 0 : AccountingAllocator::ReturnSegment(memory);
2739 : size_t malloced_current = GetCurrentMemoryUsage();
2740 :
2741 0 : if (malloced_current + allocation_sample_bytes_ < last_memory_usage_) {
2742 0 : PrintMemoryJSON(malloced_current);
2743 : last_memory_usage_ = malloced_current;
2744 : }
2745 0 : }
2746 :
2747 0 : void ZoneCreation(const Zone* zone) override {
2748 0 : PrintZoneModificationSample(zone, "zonecreation");
2749 : nesting_deepth_++;
2750 0 : }
2751 :
2752 0 : void ZoneDestruction(const Zone* zone) override {
2753 : nesting_deepth_--;
2754 0 : PrintZoneModificationSample(zone, "zonedestruction");
2755 0 : }
2756 :
2757 : private:
2758 0 : void PrintZoneModificationSample(const Zone* zone, const char* type) {
2759 : PrintF(
2760 : "{"
2761 : "\"type\": \"%s\", "
2762 : "\"isolate\": \"%p\", "
2763 : "\"time\": %f, "
2764 : "\"ptr\": \"%p\", "
2765 : "\"name\": \"%s\", "
2766 : "\"size\": %" PRIuS
2767 : ","
2768 : "\"nesting\": %zu}\n",
2769 0 : type, reinterpret_cast<void*>(heap_->isolate()),
2770 0 : heap_->isolate()->time_millis_since_init(),
2771 : reinterpret_cast<const void*>(zone), zone->name(),
2772 0 : zone->allocation_size(), nesting_deepth_.load());
2773 0 : }
2774 :
2775 0 : void PrintMemoryJSON(size_t malloced) {
2776 : // Note: Neither isolate, nor heap is locked, so be careful with accesses
2777 : // as the allocator is potentially used on a concurrent thread.
2778 0 : double time = heap_->isolate()->time_millis_since_init();
2779 : PrintF(
2780 : "{"
2781 : "\"type\": \"zone\", "
2782 : "\"isolate\": \"%p\", "
2783 : "\"time\": %f, "
2784 : "\"allocated\": %" PRIuS "}\n",
2785 0 : reinterpret_cast<void*>(heap_->isolate()), time, malloced);
2786 0 : }
2787 :
2788 : Heap* heap_;
2789 : std::atomic<size_t> last_memory_usage_{0};
2790 : std::atomic<size_t> nesting_deepth_{0};
2791 : size_t allocation_sample_bytes_;
2792 : };
2793 :
2794 : #ifdef DEBUG
2795 : std::atomic<size_t> Isolate::non_disposed_isolates_;
2796 : #endif // DEBUG
2797 :
2798 : // static
2799 61528 : Isolate* Isolate::New(IsolateAllocationMode mode) {
2800 : // IsolateAllocator allocates the memory for the Isolate object according to
2801 : // the given allocation mode.
2802 : std::unique_ptr<IsolateAllocator> isolate_allocator =
2803 61534 : base::make_unique<IsolateAllocator>(mode);
2804 : // Construct Isolate object in the allocated memory.
2805 : void* isolate_ptr = isolate_allocator->isolate_memory();
2806 61534 : Isolate* isolate = new (isolate_ptr) Isolate(std::move(isolate_allocator));
2807 : #if V8_TARGET_ARCH_64_BIT
2808 : DCHECK_IMPLIES(
2809 : mode == IsolateAllocationMode::kInV8Heap,
2810 : IsAligned(isolate->isolate_root(), kPtrComprIsolateRootAlignment));
2811 : #endif
2812 :
2813 : #ifdef DEBUG
2814 : non_disposed_isolates_++;
2815 : #endif // DEBUG
2816 :
2817 61534 : return isolate;
2818 : }
2819 :
2820 : // static
2821 61517 : void Isolate::Delete(Isolate* isolate) {
2822 : DCHECK_NOT_NULL(isolate);
2823 : // Temporarily set this isolate as current so that various parts of
2824 : // the isolate can access it in their destructors without having a
2825 : // direct pointer. We don't use Enter/Exit here to avoid
2826 : // initializing the thread data.
2827 : PerIsolateThreadData* saved_data = isolate->CurrentPerIsolateThreadData();
2828 : DCHECK_EQ(true, isolate_key_created_.load(std::memory_order_relaxed));
2829 : Isolate* saved_isolate = reinterpret_cast<Isolate*>(
2830 61517 : base::Thread::GetThreadLocal(isolate->isolate_key_));
2831 61518 : SetIsolateThreadLocals(isolate, nullptr);
2832 :
2833 61517 : isolate->Deinit();
2834 :
2835 : #ifdef DEBUG
2836 : non_disposed_isolates_--;
2837 : #endif // DEBUG
2838 :
2839 : // Take ownership of the IsolateAllocator to ensure the Isolate memory will
2840 : // be available during Isolate descructor call.
2841 : std::unique_ptr<IsolateAllocator> isolate_allocator =
2842 61519 : std::move(isolate->isolate_allocator_);
2843 61519 : isolate->~Isolate();
2844 : // Now free the memory owned by the allocator.
2845 61518 : isolate_allocator.reset();
2846 :
2847 : // Restore the previous current isolate.
2848 61519 : SetIsolateThreadLocals(saved_isolate, saved_data);
2849 61519 : }
2850 :
2851 62548 : v8::PageAllocator* Isolate::page_allocator() {
2852 62548 : return isolate_allocator_->page_allocator();
2853 : }
2854 :
2855 61534 : Isolate::Isolate(std::unique_ptr<i::IsolateAllocator> isolate_allocator)
2856 : : isolate_allocator_(std::move(isolate_allocator)),
2857 : id_(isolate_counter.fetch_add(1, std::memory_order_relaxed)),
2858 : stack_guard_(this),
2859 : allocator_(FLAG_trace_zone_stats
2860 : ? new VerboseAccountingAllocator(&heap_, 256 * KB)
2861 : : new AccountingAllocator()),
2862 : builtins_(this),
2863 : rail_mode_(PERFORMANCE_ANIMATION),
2864 : code_event_dispatcher_(new CodeEventDispatcher()),
2865 1169145 : cancelable_task_manager_(new CancelableTaskManager()) {
2866 : TRACE_ISOLATE(constructor);
2867 : CheckIsolateLayout();
2868 :
2869 : // ThreadManager is initialized early to support locking an isolate
2870 : // before it is entered.
2871 61533 : thread_manager_ = new ThreadManager(this);
2872 :
2873 : handle_scope_data_.Initialize();
2874 :
2875 : #define ISOLATE_INIT_EXECUTE(type, name, initial_value) \
2876 : name##_ = (initial_value);
2877 61533 : ISOLATE_INIT_LIST(ISOLATE_INIT_EXECUTE)
2878 : #undef ISOLATE_INIT_EXECUTE
2879 :
2880 : #define ISOLATE_INIT_ARRAY_EXECUTE(type, name, length) \
2881 : memset(name##_, 0, sizeof(type) * length);
2882 246132 : ISOLATE_INIT_ARRAY_LIST(ISOLATE_INIT_ARRAY_EXECUTE)
2883 : #undef ISOLATE_INIT_ARRAY_EXECUTE
2884 :
2885 61533 : InitializeLoggingAndCounters();
2886 61534 : debug_ = new Debug(this);
2887 :
2888 61534 : InitializeDefaultEmbeddedBlob();
2889 :
2890 61534 : MicrotaskQueue::SetUpDefaultMicrotaskQueue(this);
2891 61534 : }
2892 :
2893 0 : void Isolate::CheckIsolateLayout() {
2894 : CHECK_EQ(OFFSET_OF(Isolate, isolate_data_), 0);
2895 : CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, isolate_data_.embedder_data_)),
2896 : Internals::kIsolateEmbedderDataOffset);
2897 : CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, isolate_data_.roots_)),
2898 : Internals::kIsolateRootsOffset);
2899 : CHECK_EQ(Internals::kExternalMemoryOffset % 8, 0);
2900 : CHECK_EQ(static_cast<int>(OFFSET_OF(Isolate, isolate_data_.external_memory_)),
2901 : Internals::kExternalMemoryOffset);
2902 : CHECK_EQ(Internals::kExternalMemoryLimitOffset % 8, 0);
2903 : CHECK_EQ(static_cast<int>(
2904 : OFFSET_OF(Isolate, isolate_data_.external_memory_limit_)),
2905 : Internals::kExternalMemoryLimitOffset);
2906 : CHECK_EQ(Internals::kExternalMemoryAtLastMarkCompactOffset % 8, 0);
2907 : CHECK_EQ(static_cast<int>(OFFSET_OF(
2908 : Isolate, isolate_data_.external_memory_at_last_mark_compact_)),
2909 : Internals::kExternalMemoryAtLastMarkCompactOffset);
2910 0 : }
2911 :
2912 62775 : void Isolate::ClearSerializerData() {
2913 63289 : delete external_reference_map_;
2914 62775 : external_reference_map_ = nullptr;
2915 62775 : }
2916 :
2917 82227 : bool Isolate::LogObjectRelocation() {
2918 163787 : return FLAG_verify_predictable || logger()->is_logging() || is_profiling() ||
2919 163136 : heap()->isolate()->logger()->is_listening_to_code_events() ||
2920 81563 : (heap_profiler() != nullptr &&
2921 163669 : heap_profiler()->is_tracking_object_moves()) ||
2922 82227 : heap()->has_heap_object_allocation_tracker();
2923 : }
2924 :
2925 61518 : void Isolate::Deinit() {
2926 : TRACE_ISOLATE(deinit);
2927 :
2928 : tracing_cpu_profiler_.reset();
2929 61519 : if (FLAG_stress_sampling_allocation_profiler > 0) {
2930 0 : heap_profiler()->StopSamplingHeapProfiler();
2931 : }
2932 :
2933 61519 : debug()->Unload();
2934 :
2935 61518 : wasm_engine()->DeleteCompileJobsOnIsolate(this);
2936 :
2937 61519 : if (concurrent_recompilation_enabled()) {
2938 61415 : optimizing_compile_dispatcher_->Stop();
2939 61415 : delete optimizing_compile_dispatcher_;
2940 61415 : optimizing_compile_dispatcher_ = nullptr;
2941 : }
2942 :
2943 61519 : wasm_engine()->memory_tracker()->DeleteSharedMemoryObjectsOnIsolate(this);
2944 :
2945 61519 : heap_.mark_compact_collector()->EnsureSweepingCompleted();
2946 61518 : heap_.memory_allocator()->unmapper()->EnsureUnmappingCompleted();
2947 :
2948 61518 : DumpAndResetStats();
2949 :
2950 61518 : if (FLAG_print_deopt_stress) {
2951 0 : PrintF(stdout, "=== Stress deopt counter: %u\n", stress_deopt_count_);
2952 : }
2953 :
2954 : // We must stop the logger before we tear down other components.
2955 61518 : sampler::Sampler* sampler = logger_->sampler();
2956 122977 : if (sampler && sampler->IsActive()) sampler->Stop();
2957 :
2958 : FreeThreadResources();
2959 61518 : logger_->StopProfilerThread();
2960 :
2961 : // We start with the heap tear down so that releasing managed objects does
2962 : // not cause a GC.
2963 61518 : heap_.StartTearDown();
2964 :
2965 61517 : ReleaseSharedPtrs();
2966 :
2967 61519 : delete deoptimizer_data_;
2968 61519 : deoptimizer_data_ = nullptr;
2969 61519 : builtins_.TearDown();
2970 61518 : bootstrapper_->TearDown();
2971 :
2972 61518 : if (runtime_profiler_ != nullptr) {
2973 61518 : delete runtime_profiler_;
2974 61519 : runtime_profiler_ = nullptr;
2975 : }
2976 :
2977 61519 : delete heap_profiler_;
2978 61518 : heap_profiler_ = nullptr;
2979 :
2980 61518 : compiler_dispatcher_->AbortAll();
2981 61519 : delete compiler_dispatcher_;
2982 61519 : compiler_dispatcher_ = nullptr;
2983 :
2984 : // This stops cancelable tasks (i.e. concurrent marking tasks)
2985 61519 : cancelable_task_manager()->CancelAndWait();
2986 :
2987 61519 : heap_.TearDown();
2988 61519 : logger_->TearDown();
2989 :
2990 61519 : if (wasm_engine_) {
2991 61519 : wasm_engine_->RemoveIsolate(this);
2992 : wasm_engine_.reset();
2993 : }
2994 :
2995 61519 : TearDownEmbeddedBlob();
2996 :
2997 61519 : delete interpreter_;
2998 61520 : interpreter_ = nullptr;
2999 :
3000 123039 : delete ast_string_constants_;
3001 61520 : ast_string_constants_ = nullptr;
3002 :
3003 : code_event_dispatcher_.reset();
3004 :
3005 77786 : delete root_index_map_;
3006 61519 : root_index_map_ = nullptr;
3007 :
3008 61519 : delete compiler_zone_;
3009 61519 : compiler_zone_ = nullptr;
3010 61519 : compiler_cache_ = nullptr;
3011 :
3012 61519 : ClearSerializerData();
3013 :
3014 : {
3015 61519 : base::MutexGuard lock_guard(&thread_data_table_mutex_);
3016 61519 : thread_data_table_.RemoveAllThreads();
3017 : }
3018 61519 : }
3019 :
3020 :
3021 546770 : void Isolate::SetIsolateThreadLocals(Isolate* isolate,
3022 : PerIsolateThreadData* data) {
3023 546770 : base::Thread::SetThreadLocal(isolate_key_, isolate);
3024 546730 : base::Thread::SetThreadLocal(per_isolate_thread_data_key_, data);
3025 546714 : }
3026 :
3027 :
3028 369111 : Isolate::~Isolate() {
3029 : TRACE_ISOLATE(destructor);
3030 :
3031 : // The entry stack must be empty when we get here.
3032 : DCHECK(entry_stack_ == nullptr || entry_stack_->previous_item == nullptr);
3033 :
3034 61519 : delete entry_stack_;
3035 61519 : entry_stack_ = nullptr;
3036 :
3037 61519 : delete unicode_cache_;
3038 61519 : unicode_cache_ = nullptr;
3039 :
3040 61519 : delete date_cache_;
3041 61518 : date_cache_ = nullptr;
3042 :
3043 61518 : delete regexp_stack_;
3044 61518 : regexp_stack_ = nullptr;
3045 :
3046 61518 : delete descriptor_lookup_cache_;
3047 61518 : descriptor_lookup_cache_ = nullptr;
3048 :
3049 61518 : delete load_stub_cache_;
3050 61519 : load_stub_cache_ = nullptr;
3051 61519 : delete store_stub_cache_;
3052 61519 : store_stub_cache_ = nullptr;
3053 :
3054 123038 : delete materialized_object_store_;
3055 61518 : materialized_object_store_ = nullptr;
3056 :
3057 61518 : delete logger_;
3058 61518 : logger_ = nullptr;
3059 :
3060 61518 : delete handle_scope_implementer_;
3061 61519 : handle_scope_implementer_ = nullptr;
3062 :
3063 : delete code_tracer();
3064 : set_code_tracer(nullptr);
3065 :
3066 61519 : delete compilation_cache_;
3067 61519 : compilation_cache_ = nullptr;
3068 61519 : delete bootstrapper_;
3069 61519 : bootstrapper_ = nullptr;
3070 61519 : delete inner_pointer_to_code_cache_;
3071 61519 : inner_pointer_to_code_cache_ = nullptr;
3072 :
3073 61519 : delete thread_manager_;
3074 61519 : thread_manager_ = nullptr;
3075 :
3076 61519 : delete global_handles_;
3077 61519 : global_handles_ = nullptr;
3078 61519 : delete eternal_handles_;
3079 61519 : eternal_handles_ = nullptr;
3080 :
3081 61534 : delete string_stream_debug_object_cache_;
3082 61519 : string_stream_debug_object_cache_ = nullptr;
3083 :
3084 61519 : delete random_number_generator_;
3085 61519 : random_number_generator_ = nullptr;
3086 :
3087 61519 : delete fuzzer_rng_;
3088 61518 : fuzzer_rng_ = nullptr;
3089 :
3090 61518 : delete debug_;
3091 61518 : debug_ = nullptr;
3092 :
3093 61518 : delete cancelable_task_manager_;
3094 61518 : cancelable_task_manager_ = nullptr;
3095 :
3096 61518 : delete allocator_;
3097 61518 : allocator_ = nullptr;
3098 :
3099 : // Assert that |default_microtask_queue_| is the last MicrotaskQueue instance.
3100 : DCHECK_IMPLIES(default_microtask_queue_,
3101 : default_microtask_queue_ == default_microtask_queue_->next());
3102 61518 : delete default_microtask_queue_;
3103 61519 : default_microtask_queue_ = nullptr;
3104 61518 : }
3105 :
3106 93971 : void Isolate::InitializeThreadLocal() { thread_local_top()->Initialize(this); }
3107 :
3108 20 : void Isolate::SetTerminationOnExternalTryCatch() {
3109 1891 : if (try_catch_handler() == nullptr) return;
3110 1881 : try_catch_handler()->can_continue_ = false;
3111 1881 : try_catch_handler()->has_terminated_ = true;
3112 : try_catch_handler()->exception_ =
3113 1881 : reinterpret_cast<void*>(ReadOnlyRoots(heap()).null_value().ptr());
3114 : }
3115 :
3116 168389 : bool Isolate::PropagatePendingExceptionToExternalTryCatch() {
3117 : Object exception = pending_exception();
3118 :
3119 168389 : if (IsJavaScriptHandlerOnTop(exception)) {
3120 137476 : thread_local_top()->external_caught_exception_ = false;
3121 137476 : return false;
3122 : }
3123 :
3124 30913 : if (!IsExternalHandlerOnTop(exception)) {
3125 4492 : thread_local_top()->external_caught_exception_ = false;
3126 4492 : return true;
3127 : }
3128 :
3129 26421 : thread_local_top()->external_caught_exception_ = true;
3130 26421 : if (!is_catchable_by_javascript(exception)) {
3131 : SetTerminationOnExternalTryCatch();
3132 : } else {
3133 : v8::TryCatch* handler = try_catch_handler();
3134 : DCHECK(thread_local_top()->pending_message_obj_->IsJSMessageObject() ||
3135 : thread_local_top()->pending_message_obj_->IsTheHole(this));
3136 24550 : handler->can_continue_ = true;
3137 24550 : handler->has_terminated_ = false;
3138 24550 : handler->exception_ = reinterpret_cast<void*>(pending_exception().ptr());
3139 : // Propagate to the external try-catch only if we got an actual message.
3140 24550 : if (thread_local_top()->pending_message_obj_->IsTheHole(this)) return true;
3141 :
3142 : handler->message_obj_ =
3143 11173 : reinterpret_cast<void*>(thread_local_top()->pending_message_obj_.ptr());
3144 : }
3145 : return true;
3146 : }
3147 :
3148 62111 : bool Isolate::InitializeCounters() {
3149 62111 : if (async_counters_) return false;
3150 123067 : async_counters_ = std::make_shared<Counters>(this);
3151 61534 : return true;
3152 : }
3153 :
3154 62111 : void Isolate::InitializeLoggingAndCounters() {
3155 62111 : if (logger_ == nullptr) {
3156 61533 : logger_ = new Logger(this);
3157 : }
3158 62110 : InitializeCounters();
3159 62113 : }
3160 :
3161 : namespace {
3162 :
3163 56 : void CreateOffHeapTrampolines(Isolate* isolate) {
3164 : DCHECK_NOT_NULL(isolate->embedded_blob());
3165 : DCHECK_NE(0, isolate->embedded_blob_size());
3166 :
3167 : HandleScope scope(isolate);
3168 : Builtins* builtins = isolate->builtins();
3169 :
3170 56 : EmbeddedData d = EmbeddedData::FromBlob();
3171 :
3172 169736 : for (int i = 0; i < Builtins::builtin_count; i++) {
3173 : if (!Builtins::IsIsolateIndependent(i)) continue;
3174 :
3175 84840 : Address instruction_start = d.InstructionStartOfBuiltin(i);
3176 : Handle<Code> trampoline = isolate->factory()->NewOffHeapTrampolineFor(
3177 84840 : builtins->builtin_handle(i), instruction_start);
3178 :
3179 : // From this point onwards, the old builtin code object is unreachable and
3180 : // will be collected by the next GC.
3181 84840 : builtins->set_builtin(i, *trampoline);
3182 :
3183 84840 : if (isolate->logger()->is_listening_to_code_events() ||
3184 : isolate->is_profiling()) {
3185 0 : isolate->logger()->LogCodeObject(*trampoline);
3186 : }
3187 : }
3188 56 : }
3189 :
3190 : #ifdef DEBUG
3191 : bool IsolateIsCompatibleWithEmbeddedBlob(Isolate* isolate) {
3192 : if (!FLAG_embedded_builtins) return true;
3193 : EmbeddedData d = EmbeddedData::FromBlob(isolate);
3194 : return (d.IsolateHash() == isolate->HashIsolateForEmbeddedBlob());
3195 : }
3196 : #endif // DEBUG
3197 :
3198 : } // namespace
3199 :
3200 61534 : void Isolate::InitializeDefaultEmbeddedBlob() {
3201 : const uint8_t* blob = DefaultEmbeddedBlob();
3202 : uint32_t size = DefaultEmbeddedBlobSize();
3203 :
3204 : #ifdef V8_MULTI_SNAPSHOTS
3205 : if (!FLAG_untrusted_code_mitigations) {
3206 : blob = TrustedEmbeddedBlob();
3207 : size = TrustedEmbeddedBlobSize();
3208 : }
3209 : #endif
3210 :
3211 61534 : if (StickyEmbeddedBlob() != nullptr) {
3212 : base::MutexGuard guard(current_embedded_blob_refcount_mutex_.Pointer());
3213 : // Check again now that we hold the lock.
3214 55 : if (StickyEmbeddedBlob() != nullptr) {
3215 : blob = StickyEmbeddedBlob();
3216 : size = StickyEmbeddedBlobSize();
3217 55 : current_embedded_blob_refs_++;
3218 : }
3219 : }
3220 :
3221 61534 : if (blob == nullptr) {
3222 1 : CHECK_EQ(0, size);
3223 : } else {
3224 61533 : SetEmbeddedBlob(blob, size);
3225 : }
3226 61534 : }
3227 :
3228 56 : void Isolate::CreateAndSetEmbeddedBlob() {
3229 : base::MutexGuard guard(current_embedded_blob_refcount_mutex_.Pointer());
3230 :
3231 : PrepareBuiltinSourcePositionMap();
3232 :
3233 : // If a sticky blob has been set, we reuse it.
3234 56 : if (StickyEmbeddedBlob() != nullptr) {
3235 0 : CHECK_EQ(embedded_blob(), StickyEmbeddedBlob());
3236 0 : CHECK_EQ(CurrentEmbeddedBlob(), StickyEmbeddedBlob());
3237 : } else {
3238 : // Create and set a new embedded blob.
3239 : uint8_t* data;
3240 : uint32_t size;
3241 56 : InstructionStream::CreateOffHeapInstructionStream(this, &data, &size);
3242 :
3243 56 : CHECK_EQ(0, current_embedded_blob_refs_);
3244 56 : const uint8_t* const_data = const_cast<const uint8_t*>(data);
3245 56 : SetEmbeddedBlob(const_data, size);
3246 56 : current_embedded_blob_refs_++;
3247 :
3248 56 : SetStickyEmbeddedBlob(const_data, size);
3249 : }
3250 :
3251 56 : CreateOffHeapTrampolines(this);
3252 56 : }
3253 :
3254 61519 : void Isolate::TearDownEmbeddedBlob() {
3255 : // Nothing to do in case the blob is embedded into the binary or unset.
3256 61519 : if (StickyEmbeddedBlob() == nullptr) return;
3257 :
3258 111 : CHECK_EQ(embedded_blob(), StickyEmbeddedBlob());
3259 111 : CHECK_EQ(CurrentEmbeddedBlob(), StickyEmbeddedBlob());
3260 :
3261 : base::MutexGuard guard(current_embedded_blob_refcount_mutex_.Pointer());
3262 111 : current_embedded_blob_refs_--;
3263 111 : if (current_embedded_blob_refs_ == 0 && enable_embedded_blob_refcounting_) {
3264 : // We own the embedded blob and are the last holder. Free it.
3265 : InstructionStream::FreeOffHeapInstructionStream(
3266 0 : const_cast<uint8_t*>(embedded_blob()), embedded_blob_size());
3267 0 : ClearEmbeddedBlob();
3268 : }
3269 : }
3270 :
3271 1 : bool Isolate::InitWithoutSnapshot() { return Init(nullptr, nullptr); }
3272 :
3273 61422 : bool Isolate::InitWithSnapshot(ReadOnlyDeserializer* read_only_deserializer,
3274 : StartupDeserializer* startup_deserializer) {
3275 : DCHECK_NOT_NULL(read_only_deserializer);
3276 : DCHECK_NOT_NULL(startup_deserializer);
3277 61422 : return Init(read_only_deserializer, startup_deserializer);
3278 : }
3279 :
3280 61533 : bool Isolate::Init(ReadOnlyDeserializer* read_only_deserializer,
3281 : StartupDeserializer* startup_deserializer) {
3282 : TRACE_ISOLATE(init);
3283 61533 : const bool create_heap_objects = (read_only_deserializer == nullptr);
3284 : // We either have both or neither.
3285 : DCHECK_EQ(create_heap_objects, startup_deserializer == nullptr);
3286 :
3287 : base::ElapsedTimer timer;
3288 61533 : if (create_heap_objects && FLAG_profile_deserialization) timer.Start();
3289 :
3290 61533 : time_millis_at_init_ = heap_.MonotonicallyIncreasingTimeInMs();
3291 :
3292 61533 : stress_deopt_count_ = FLAG_deopt_every_n_times;
3293 61533 : force_slow_path_ = FLAG_force_slow_path;
3294 :
3295 61533 : has_fatal_error_ = false;
3296 :
3297 : // The initialization process does not handle memory exhaustion.
3298 : AlwaysAllocateScope always_allocate(this);
3299 :
3300 : // Safe after setting Heap::isolate_, and initializing StackGuard
3301 61533 : heap_.SetStackLimits();
3302 :
3303 : #define ASSIGN_ELEMENT(CamelName, hacker_name) \
3304 : isolate_addresses_[IsolateAddressId::k##CamelName##Address] = \
3305 : reinterpret_cast<Address>(hacker_name##_address());
3306 738384 : FOR_EACH_ISOLATE_ADDRESS_NAME(ASSIGN_ELEMENT)
3307 : #undef ASSIGN_ELEMENT
3308 :
3309 61532 : compilation_cache_ = new CompilationCache(this);
3310 123061 : descriptor_lookup_cache_ = new DescriptorLookupCache();
3311 123061 : unicode_cache_ = new UnicodeCache();
3312 61531 : inner_pointer_to_code_cache_ = new InnerPointerToCodeCache(this);
3313 61534 : global_handles_ = new GlobalHandles(this);
3314 123066 : eternal_handles_ = new EternalHandles();
3315 61533 : bootstrapper_ = new Bootstrapper(this);
3316 123065 : handle_scope_implementer_ = new HandleScopeImplementer(this);
3317 61534 : load_stub_cache_ = new StubCache(this);
3318 61533 : store_stub_cache_ = new StubCache(this);
3319 123068 : materialized_object_store_ = new MaterializedObjectStore(this);
3320 61534 : regexp_stack_ = new RegExpStack();
3321 61533 : regexp_stack_->isolate_ = this;
3322 61533 : date_cache_ = new DateCache();
3323 61531 : heap_profiler_ = new HeapProfiler(heap());
3324 61528 : interpreter_ = new interpreter::Interpreter(this);
3325 :
3326 : compiler_dispatcher_ =
3327 61531 : new CompilerDispatcher(this, V8::GetCurrentPlatform(), FLAG_stack_size);
3328 :
3329 : // Enable logging before setting up the heap
3330 61534 : logger_->SetUp(this);
3331 :
3332 : { // NOLINT
3333 : // Ensure that the thread has a valid stack guard. The v8::Locker object
3334 : // will ensure this too, but we don't have to use lockers if we are only
3335 : // using one thread.
3336 : ExecutionAccess lock(this);
3337 61533 : stack_guard_.InitThread(lock);
3338 : }
3339 :
3340 : // SetUp the object heap.
3341 : DCHECK(!heap_.HasBeenSetUp());
3342 61532 : heap_.SetUp();
3343 61534 : ReadOnlyHeap::SetUp(this, read_only_deserializer);
3344 61534 : heap_.SetUpSpaces();
3345 :
3346 61534 : isolate_data_.external_reference_table()->Init(this);
3347 :
3348 : // Setup the wasm engine.
3349 61534 : if (wasm_engine_ == nullptr) {
3350 122900 : SetWasmEngine(wasm::WasmEngine::GetWasmEngine());
3351 : }
3352 : DCHECK_NOT_NULL(wasm_engine_);
3353 :
3354 61534 : deoptimizer_data_ = new DeoptimizerData(heap());
3355 :
3356 61534 : if (setup_delegate_ == nullptr) {
3357 122538 : setup_delegate_ = new SetupIsolateDelegate(create_heap_objects);
3358 : }
3359 :
3360 61534 : if (!setup_delegate_->SetupHeap(&heap_)) {
3361 0 : V8::FatalProcessOutOfMemory(this, "heap object creation");
3362 : return false;
3363 : }
3364 :
3365 61534 : if (create_heap_objects) {
3366 : // Terminate the partial snapshot cache so we can iterate.
3367 112 : partial_snapshot_cache_.push_back(ReadOnlyRoots(this).undefined_value());
3368 : }
3369 :
3370 : InitializeThreadLocal();
3371 :
3372 : // Profiler has to be created after ThreadLocal is initialized
3373 : // because it makes use of interrupts.
3374 61534 : tracing_cpu_profiler_.reset(new TracingCpuProfilerImpl(this));
3375 :
3376 61534 : bootstrapper_->Initialize(create_heap_objects);
3377 :
3378 61534 : if (FLAG_embedded_builtins && create_heap_objects) {
3379 56 : builtins_constants_table_builder_ = new BuiltinsConstantsTableBuilder(this);
3380 : }
3381 61534 : setup_delegate_->SetupBuiltins(this);
3382 : #ifndef V8_TARGET_ARCH_ARM
3383 61534 : if (create_heap_objects) {
3384 : // Store the interpreter entry trampoline on the root list. It is used as a
3385 : // template for further copies that may later be created to help profile
3386 : // interpreted code.
3387 : // We currently cannot do this on arm due to RELATIVE_CODE_TARGETs
3388 : // assuming that all possible Code targets may be addressed with an int24
3389 : // offset, effectively limiting code space size to 32MB. We can guarantee
3390 : // this at mksnapshot-time, but not at runtime.
3391 : // See also: https://crbug.com/v8/8713.
3392 56 : heap_.SetInterpreterEntryTrampolineForProfiling(
3393 56 : heap_.builtin(Builtins::kInterpreterEntryTrampoline));
3394 : }
3395 : #endif
3396 61534 : if (FLAG_embedded_builtins && create_heap_objects) {
3397 56 : builtins_constants_table_builder_->Finalize();
3398 112 : delete builtins_constants_table_builder_;
3399 56 : builtins_constants_table_builder_ = nullptr;
3400 :
3401 56 : CreateAndSetEmbeddedBlob();
3402 : }
3403 :
3404 : // Initialize custom memcopy and memmove functions (must happen after
3405 : // embedded blob setup).
3406 61534 : init_memcopy_functions();
3407 :
3408 61534 : if (FLAG_log_internal_timer_events) {
3409 : set_event_logger(Logger::DefaultEventLoggerSentinel);
3410 : }
3411 :
3412 61534 : if (FLAG_trace_turbo || FLAG_trace_turbo_graph || FLAG_turbo_profiling) {
3413 5 : PrintF("Concurrent recompilation has been disabled for tracing.\n");
3414 61529 : } else if (OptimizingCompileDispatcher::Enabled()) {
3415 61430 : optimizing_compile_dispatcher_ = new OptimizingCompileDispatcher(this);
3416 : }
3417 :
3418 : // Initialize runtime profiler before deserialization, because collections may
3419 : // occur, clearing/updating ICs.
3420 61533 : runtime_profiler_ = new RuntimeProfiler(this);
3421 :
3422 : // If we are deserializing, read the state into the now-empty heap.
3423 : {
3424 : AlwaysAllocateScope always_allocate(this);
3425 123067 : CodeSpaceMemoryModificationScope modification_scope(&heap_);
3426 :
3427 61534 : if (!create_heap_objects) {
3428 61478 : startup_deserializer->DeserializeInto(this);
3429 : } else {
3430 56 : heap_.read_only_heap()->OnCreateHeapObjectsComplete();
3431 : }
3432 61534 : load_stub_cache_->Initialize();
3433 61534 : store_stub_cache_->Initialize();
3434 61534 : interpreter_->Initialize();
3435 61534 : heap_.NotifyDeserializationComplete();
3436 : }
3437 61534 : delete setup_delegate_;
3438 61534 : setup_delegate_ = nullptr;
3439 :
3440 : // Initialize the builtin entry table.
3441 61534 : Builtins::UpdateBuiltinEntryTable(this);
3442 :
3443 : #ifdef DEBUG
3444 : // Verify that the current heap state (usually deserialized from the snapshot)
3445 : // is compatible with the embedded blob. If this DCHECK fails, we've likely
3446 : // loaded a snapshot generated by a different V8 version or build-time
3447 : // configuration.
3448 : if (!IsolateIsCompatibleWithEmbeddedBlob(this)) {
3449 : FATAL(
3450 : "The Isolate is incompatible with the embedded blob. This is usually "
3451 : "caused by incorrect usage of mksnapshot. When generating custom "
3452 : "snapshots, embedders must ensure they pass the same flags as during "
3453 : "the V8 build process (e.g.: --turbo-instruction-scheduling).");
3454 : }
3455 : DCHECK_IMPLIES(FLAG_jitless, FLAG_embedded_builtins);
3456 : #endif // DEBUG
3457 :
3458 : #ifndef V8_TARGET_ARCH_ARM
3459 : // The IET for profiling should always be a full on-heap Code object.
3460 : DCHECK(!Code::cast(heap_.interpreter_entry_trampoline_for_profiling())
3461 : ->is_off_heap_trampoline());
3462 : #endif // V8_TARGET_ARCH_ARM
3463 :
3464 : if (FLAG_print_builtin_code) builtins()->PrintBuiltinCode();
3465 : if (FLAG_print_builtin_size) builtins()->PrintBuiltinSize();
3466 :
3467 : // Finish initialization of ThreadLocal after deserialization is done.
3468 : clear_pending_exception();
3469 : clear_pending_message();
3470 : clear_scheduled_exception();
3471 :
3472 : // Deserializing may put strange things in the root array's copy of the
3473 : // stack guard.
3474 61534 : heap_.SetStackLimits();
3475 :
3476 : // Quiet the heap NaN if needed on target platform.
3477 : if (!create_heap_objects)
3478 : Assembler::QuietNaN(ReadOnlyRoots(this).nan_value());
3479 :
3480 61534 : if (FLAG_trace_turbo) {
3481 : // Create an empty file.
3482 10 : std::ofstream(GetTurboCfgFileName(this).c_str(), std::ios_base::trunc);
3483 : }
3484 :
3485 : {
3486 : HandleScope scope(this);
3487 61534 : ast_string_constants_ = new AstStringConstants(this, HashSeed(this));
3488 : }
3489 :
3490 61533 : initialized_from_snapshot_ = !create_heap_objects;
3491 :
3492 61533 : if (!FLAG_inline_new) heap_.DisableInlineAllocation();
3493 :
3494 61533 : if (FLAG_stress_sampling_allocation_profiler > 0) {
3495 0 : uint64_t sample_interval = FLAG_stress_sampling_allocation_profiler;
3496 : int stack_depth = 128;
3497 : v8::HeapProfiler::SamplingFlags sampling_flags =
3498 : v8::HeapProfiler::SamplingFlags::kSamplingForceGC;
3499 : heap_profiler()->StartSamplingHeapProfiler(sample_interval, stack_depth,
3500 0 : sampling_flags);
3501 : }
3502 :
3503 61533 : if (create_heap_objects && FLAG_profile_deserialization) {
3504 0 : double ms = timer.Elapsed().InMillisecondsF();
3505 0 : PrintF("[Initializing isolate from scratch took %0.3f ms]\n", ms);
3506 : }
3507 :
3508 : return true;
3509 : }
3510 :
3511 222125 : void Isolate::Enter() {
3512 : Isolate* current_isolate = nullptr;
3513 : PerIsolateThreadData* current_data = CurrentPerIsolateThreadData();
3514 222119 : if (current_data != nullptr) {
3515 11387 : current_isolate = current_data->isolate_;
3516 : DCHECK_NOT_NULL(current_isolate);
3517 11387 : if (current_isolate == this) {
3518 : DCHECK(Current() == this);
3519 : DCHECK_NOT_NULL(entry_stack_);
3520 : DCHECK(entry_stack_->previous_thread_data == nullptr ||
3521 : entry_stack_->previous_thread_data->thread_id() ==
3522 : ThreadId::Current());
3523 : // Same thread re-enters the isolate, no need to re-init anything.
3524 10233 : entry_stack_->entry_count++;
3525 10233 : return;
3526 : }
3527 : }
3528 :
3529 211886 : PerIsolateThreadData* data = FindOrAllocatePerThreadDataForThisThread();
3530 : DCHECK_NOT_NULL(data);
3531 : DCHECK(data->isolate_ == this);
3532 :
3533 : EntryStackItem* item = new EntryStackItem(current_data,
3534 : current_isolate,
3535 211892 : entry_stack_);
3536 211893 : entry_stack_ = item;
3537 :
3538 211893 : SetIsolateThreadLocals(this, data);
3539 :
3540 : // In case it's the first time some thread enters the isolate.
3541 : set_thread_id(data->thread_id());
3542 : }
3543 :
3544 :
3545 222111 : void Isolate::Exit() {
3546 : DCHECK_NOT_NULL(entry_stack_);
3547 : DCHECK(entry_stack_->previous_thread_data == nullptr ||
3548 : entry_stack_->previous_thread_data->thread_id() ==
3549 : ThreadId::Current());
3550 :
3551 222111 : if (--entry_stack_->entry_count > 0) return;
3552 :
3553 : DCHECK_NOT_NULL(CurrentPerIsolateThreadData());
3554 : DCHECK(CurrentPerIsolateThreadData()->isolate_ == this);
3555 :
3556 : // Pop the stack.
3557 211879 : EntryStackItem* item = entry_stack_;
3558 211879 : entry_stack_ = item->previous_item;
3559 :
3560 211879 : PerIsolateThreadData* previous_thread_data = item->previous_thread_data;
3561 211879 : Isolate* previous_isolate = item->previous_isolate;
3562 :
3563 211879 : delete item;
3564 :
3565 : // Reinit the current thread for the isolate it was running before this one.
3566 211884 : SetIsolateThreadLocals(previous_isolate, previous_thread_data);
3567 : }
3568 :
3569 :
3570 7162 : void Isolate::LinkDeferredHandles(DeferredHandles* deferred) {
3571 7162 : deferred->next_ = deferred_handles_head_;
3572 7162 : if (deferred_handles_head_ != nullptr) {
3573 2051 : deferred_handles_head_->previous_ = deferred;
3574 : }
3575 7162 : deferred_handles_head_ = deferred;
3576 7162 : }
3577 :
3578 :
3579 7162 : void Isolate::UnlinkDeferredHandles(DeferredHandles* deferred) {
3580 : #ifdef DEBUG
3581 : // In debug mode assert that the linked list is well-formed.
3582 : DeferredHandles* deferred_iterator = deferred;
3583 : while (deferred_iterator->previous_ != nullptr) {
3584 : deferred_iterator = deferred_iterator->previous_;
3585 : }
3586 : DCHECK(deferred_handles_head_ == deferred_iterator);
3587 : #endif
3588 7162 : if (deferred_handles_head_ == deferred) {
3589 5440 : deferred_handles_head_ = deferred_handles_head_->next_;
3590 : }
3591 7162 : if (deferred->next_ != nullptr) {
3592 822 : deferred->next_->previous_ = deferred->previous_;
3593 : }
3594 7162 : if (deferred->previous_ != nullptr) {
3595 1722 : deferred->previous_->next_ = deferred->next_;
3596 : }
3597 7162 : }
3598 :
3599 61518 : void Isolate::DumpAndResetStats() {
3600 61518 : if (turbo_statistics() != nullptr) {
3601 : DCHECK(FLAG_turbo_stats || FLAG_turbo_stats_nvp);
3602 0 : StdoutStream os;
3603 0 : if (FLAG_turbo_stats) {
3604 0 : AsPrintableStatistics ps = {*turbo_statistics(), false};
3605 0 : os << ps << std::endl;
3606 : }
3607 0 : if (FLAG_turbo_stats_nvp) {
3608 0 : AsPrintableStatistics ps = {*turbo_statistics(), true};
3609 0 : os << ps << std::endl;
3610 : }
3611 0 : delete turbo_statistics_;
3612 0 : turbo_statistics_ = nullptr;
3613 : }
3614 : // TODO(7424): There is no public API for the {WasmEngine} yet. So for now we
3615 : // just dump and reset the engines statistics together with the Isolate.
3616 61518 : if (FLAG_turbo_stats_wasm) {
3617 0 : wasm_engine()->DumpAndResetTurboStatistics();
3618 : }
3619 61518 : if (V8_UNLIKELY(TracingFlags::runtime_stats.load(std::memory_order_relaxed) ==
3620 : v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE)) {
3621 : counters()->worker_thread_runtime_call_stats()->AddToMainTable(
3622 0 : counters()->runtime_call_stats());
3623 0 : counters()->runtime_call_stats()->Print();
3624 0 : counters()->runtime_call_stats()->Reset();
3625 : }
3626 61518 : }
3627 :
3628 28691 : void Isolate::AbortConcurrentOptimization(BlockingBehavior behavior) {
3629 28691 : if (concurrent_recompilation_enabled()) {
3630 : DisallowHeapAllocation no_recursive_gc;
3631 28635 : optimizing_compile_dispatcher()->Flush(behavior);
3632 : }
3633 28691 : }
3634 :
3635 0 : CompilationStatistics* Isolate::GetTurboStatistics() {
3636 0 : if (turbo_statistics() == nullptr)
3637 0 : set_turbo_statistics(new CompilationStatistics());
3638 0 : return turbo_statistics();
3639 : }
3640 :
3641 :
3642 263 : CodeTracer* Isolate::GetCodeTracer() {
3643 268 : if (code_tracer() == nullptr) set_code_tracer(new CodeTracer(id()));
3644 263 : return code_tracer();
3645 : }
3646 :
3647 1736716 : bool Isolate::use_optimizer() {
3648 168908 : return FLAG_opt && !serializer_enabled_ && CpuFeatures::SupportsOptimizer() &&
3649 1905592 : !is_precise_count_code_coverage() && !is_block_count_code_coverage();
3650 : }
3651 :
3652 482611 : bool Isolate::NeedsDetailedOptimizedCodeLineInfo() const {
3653 482611 : return NeedsSourcePositionsForProfiling() ||
3654 482618 : detailed_source_positions_for_profiling();
3655 : }
3656 :
3657 1592149 : bool Isolate::NeedsSourcePositionsForProfiling() const {
3658 1591016 : return FLAG_trace_deopt || FLAG_trace_turbo || FLAG_trace_turbo_graph ||
3659 3181525 : FLAG_turbo_profiling || FLAG_perf_prof || is_profiling() ||
3660 4736304 : debug_->is_active() || logger_->is_logging() || FLAG_trace_maps;
3661 : }
3662 :
3663 1498 : void Isolate::SetFeedbackVectorsForProfilingTools(Object value) {
3664 : DCHECK(value->IsUndefined(this) || value->IsArrayList());
3665 : heap()->set_feedback_vectors_for_profiling_tools(value);
3666 1498 : }
3667 :
3668 164 : void Isolate::MaybeInitializeVectorListFromHeap() {
3669 164 : if (!heap()->feedback_vectors_for_profiling_tools()->IsUndefined(this)) {
3670 : // Already initialized, return early.
3671 : DCHECK(heap()->feedback_vectors_for_profiling_tools()->IsArrayList());
3672 8 : return;
3673 : }
3674 :
3675 : // Collect existing feedback vectors.
3676 : std::vector<Handle<FeedbackVector>> vectors;
3677 :
3678 : {
3679 312 : HeapIterator heap_iterator(heap());
3680 1184242 : for (HeapObject current_obj = heap_iterator.next(); !current_obj.is_null();
3681 : current_obj = heap_iterator.next()) {
3682 2367740 : if (!current_obj->IsFeedbackVector()) continue;
3683 :
3684 432 : FeedbackVector vector = FeedbackVector::cast(current_obj);
3685 432 : SharedFunctionInfo shared = vector->shared_function_info();
3686 :
3687 : // No need to preserve the feedback vector for non-user-visible functions.
3688 432 : if (!shared->IsSubjectToDebugging()) continue;
3689 :
3690 432 : vectors.emplace_back(vector, this);
3691 : }
3692 : }
3693 :
3694 : // Add collected feedback vectors to the root list lest we lose them to GC.
3695 : Handle<ArrayList> list =
3696 156 : ArrayList::New(this, static_cast<int>(vectors.size()));
3697 1020 : for (const auto& vector : vectors) list = ArrayList::Add(this, list, vector);
3698 : SetFeedbackVectorsForProfilingTools(*list);
3699 : }
3700 :
3701 5 : void Isolate::set_date_cache(DateCache* date_cache) {
3702 5 : if (date_cache != date_cache_) {
3703 5 : delete date_cache_;
3704 : }
3705 5 : date_cache_ = date_cache;
3706 5 : }
3707 :
3708 15309 : bool Isolate::IsArrayOrObjectOrStringPrototype(Object object) {
3709 : Object context = heap()->native_contexts_list();
3710 68237 : while (!context->IsUndefined(this)) {
3711 27307 : Context current_context = Context::cast(context);
3712 81776 : if (current_context->initial_object_prototype() == object ||
3713 53829 : current_context->initial_array_prototype() == object ||
3714 26522 : current_context->initial_string_prototype() == object) {
3715 843 : return true;
3716 : }
3717 26464 : context = current_context->next_context_link();
3718 : }
3719 : return false;
3720 : }
3721 :
3722 6719781 : bool Isolate::IsInAnyContext(Object object, uint32_t index) {
3723 : DisallowHeapAllocation no_gc;
3724 : Object context = heap()->native_contexts_list();
3725 11609575 : while (!context->IsUndefined(this)) {
3726 8045002 : Context current_context = Context::cast(context);
3727 16090008 : if (current_context->get(index) == object) {
3728 5600109 : return true;
3729 : }
3730 2444897 : context = current_context->next_context_link();
3731 : }
3732 : return false;
3733 : }
3734 :
3735 99430 : bool Isolate::IsNoElementsProtectorIntact(Context context) {
3736 : PropertyCell no_elements_cell = heap()->no_elements_protector();
3737 : bool cell_reports_intact =
3738 11686158 : no_elements_cell->value()->IsSmi() &&
3739 : Smi::ToInt(no_elements_cell->value()) == kProtectorValid;
3740 :
3741 : #ifdef DEBUG
3742 : Context native_context = context->native_context();
3743 :
3744 : Map root_array_map =
3745 : native_context->GetInitialJSArrayMap(GetInitialFastElementsKind());
3746 : JSObject initial_array_proto = JSObject::cast(
3747 : native_context->get(Context::INITIAL_ARRAY_PROTOTYPE_INDEX));
3748 : JSObject initial_object_proto = JSObject::cast(
3749 : native_context->get(Context::INITIAL_OBJECT_PROTOTYPE_INDEX));
3750 : JSObject initial_string_proto = JSObject::cast(
3751 : native_context->get(Context::INITIAL_STRING_PROTOTYPE_INDEX));
3752 :
3753 : if (root_array_map.is_null() || initial_array_proto == initial_object_proto) {
3754 : // We are in the bootstrapping process, and the entire check sequence
3755 : // shouldn't be performed.
3756 : return cell_reports_intact;
3757 : }
3758 :
3759 : // Check that the array prototype hasn't been altered WRT empty elements.
3760 : if (root_array_map->prototype() != initial_array_proto) {
3761 : DCHECK_EQ(false, cell_reports_intact);
3762 : return cell_reports_intact;
3763 : }
3764 :
3765 : FixedArrayBase elements = initial_array_proto->elements();
3766 : ReadOnlyRoots roots(heap());
3767 : if (elements != roots.empty_fixed_array() &&
3768 : elements != roots.empty_slow_element_dictionary()) {
3769 : DCHECK_EQ(false, cell_reports_intact);
3770 : return cell_reports_intact;
3771 : }
3772 :
3773 : // Check that the Object.prototype hasn't been altered WRT empty elements.
3774 : elements = initial_object_proto->elements();
3775 : if (elements != roots.empty_fixed_array() &&
3776 : elements != roots.empty_slow_element_dictionary()) {
3777 : DCHECK_EQ(false, cell_reports_intact);
3778 : return cell_reports_intact;
3779 : }
3780 :
3781 : // Check that the Array.prototype has the Object.prototype as its
3782 : // [[Prototype]] and that the Object.prototype has a null [[Prototype]].
3783 : PrototypeIterator iter(this, initial_array_proto);
3784 : if (iter.IsAtEnd() || iter.GetCurrent() != initial_object_proto) {
3785 : DCHECK_EQ(false, cell_reports_intact);
3786 : DCHECK(!has_pending_exception());
3787 : return cell_reports_intact;
3788 : }
3789 : iter.Advance();
3790 : if (!iter.IsAtEnd()) {
3791 : DCHECK_EQ(false, cell_reports_intact);
3792 : DCHECK(!has_pending_exception());
3793 : return cell_reports_intact;
3794 : }
3795 : DCHECK(!has_pending_exception());
3796 :
3797 : // Check that the String.prototype hasn't been altered WRT empty elements.
3798 : elements = initial_string_proto->elements();
3799 : if (elements != roots.empty_fixed_array() &&
3800 : elements != roots.empty_slow_element_dictionary()) {
3801 : DCHECK_EQ(false, cell_reports_intact);
3802 : return cell_reports_intact;
3803 : }
3804 :
3805 : // Check that the String.prototype has the Object.prototype
3806 : // as its [[Prototype]] still.
3807 : if (initial_string_proto->map()->prototype() != initial_object_proto) {
3808 : DCHECK_EQ(false, cell_reports_intact);
3809 : return cell_reports_intact;
3810 : }
3811 : #endif
3812 :
3813 99430 : return cell_reports_intact;
3814 : }
3815 :
3816 5726915 : bool Isolate::IsNoElementsProtectorIntact() {
3817 5726915 : return Isolate::IsNoElementsProtectorIntact(context());
3818 : }
3819 :
3820 300905 : bool Isolate::IsIsConcatSpreadableLookupChainIntact() {
3821 : Cell is_concat_spreadable_cell = heap()->is_concat_spreadable_protector();
3822 : bool is_is_concat_spreadable_set =
3823 : Smi::ToInt(is_concat_spreadable_cell->value()) == kProtectorInvalid;
3824 : #ifdef DEBUG
3825 : Map root_array_map =
3826 : raw_native_context()->GetInitialJSArrayMap(GetInitialFastElementsKind());
3827 : if (root_array_map.is_null()) {
3828 : // Ignore the value of is_concat_spreadable during bootstrap.
3829 : return !is_is_concat_spreadable_set;
3830 : }
3831 : Handle<Object> array_prototype(array_function()->prototype(), this);
3832 : Handle<Symbol> key = factory()->is_concat_spreadable_symbol();
3833 : Handle<Object> value;
3834 : LookupIterator it(this, array_prototype, key);
3835 : if (it.IsFound() && !JSReceiver::GetDataProperty(&it)->IsUndefined(this)) {
3836 : // TODO(cbruni): Currently we do not revert if we unset the
3837 : // @@isConcatSpreadable property on Array.prototype or Object.prototype
3838 : // hence the reverse implication doesn't hold.
3839 : DCHECK(is_is_concat_spreadable_set);
3840 : return false;
3841 : }
3842 : #endif // DEBUG
3843 :
3844 300905 : return !is_is_concat_spreadable_set;
3845 : }
3846 :
3847 10321 : bool Isolate::IsIsConcatSpreadableLookupChainIntact(JSReceiver receiver) {
3848 10321 : if (!IsIsConcatSpreadableLookupChainIntact()) return false;
3849 4216 : return !receiver->HasProxyInPrototype(this);
3850 : }
3851 :
3852 0 : bool Isolate::IsPromiseHookProtectorIntact() {
3853 : PropertyCell promise_hook_cell = heap()->promise_hook_protector();
3854 : bool is_promise_hook_protector_intact =
3855 0 : Smi::ToInt(promise_hook_cell->value()) == kProtectorValid;
3856 : DCHECK_IMPLIES(is_promise_hook_protector_intact,
3857 : !promise_hook_or_async_event_delegate_);
3858 : DCHECK_IMPLIES(is_promise_hook_protector_intact,
3859 : !promise_hook_or_debug_is_active_or_async_event_delegate_);
3860 0 : return is_promise_hook_protector_intact;
3861 : }
3862 :
3863 1728 : bool Isolate::IsPromiseResolveLookupChainIntact() {
3864 : Cell promise_resolve_cell = heap()->promise_resolve_protector();
3865 : bool is_promise_resolve_protector_intact =
3866 1728 : Smi::ToInt(promise_resolve_cell->value()) == kProtectorValid;
3867 1728 : return is_promise_resolve_protector_intact;
3868 : }
3869 :
3870 1686 : bool Isolate::IsPromiseThenLookupChainIntact() {
3871 : PropertyCell promise_then_cell = heap()->promise_then_protector();
3872 : bool is_promise_then_protector_intact =
3873 3216 : Smi::ToInt(promise_then_cell->value()) == kProtectorValid;
3874 1686 : return is_promise_then_protector_intact;
3875 : }
3876 :
3877 3590 : bool Isolate::IsPromiseThenLookupChainIntact(Handle<JSReceiver> receiver) {
3878 : DisallowHeapAllocation no_gc;
3879 3590 : if (!receiver->IsJSPromise()) return false;
3880 1530 : if (!IsInAnyContext(receiver->map()->prototype(),
3881 : Context::PROMISE_PROTOTYPE_INDEX)) {
3882 : return false;
3883 : }
3884 1530 : return IsPromiseThenLookupChainIntact();
3885 : }
3886 :
3887 1199874 : void Isolate::UpdateNoElementsProtectorOnSetElement(Handle<JSObject> object) {
3888 : DisallowHeapAllocation no_gc;
3889 1199874 : if (!object->map()->is_prototype_map()) return;
3890 16728 : if (!IsNoElementsProtectorIntact()) return;
3891 15309 : if (!IsArrayOrObjectOrStringPrototype(*object)) return;
3892 843 : PropertyCell::SetValueWithInvalidation(
3893 : this, factory()->no_elements_protector(),
3894 843 : handle(Smi::FromInt(kProtectorInvalid), this));
3895 : }
3896 :
3897 65 : void Isolate::InvalidateIsConcatSpreadableProtector() {
3898 : DCHECK(factory()->is_concat_spreadable_protector()->value()->IsSmi());
3899 : DCHECK(IsIsConcatSpreadableLookupChainIntact());
3900 130 : factory()->is_concat_spreadable_protector()->set_value(
3901 195 : Smi::FromInt(kProtectorInvalid));
3902 : DCHECK(!IsIsConcatSpreadableLookupChainIntact());
3903 65 : }
3904 :
3905 230 : void Isolate::InvalidateArrayConstructorProtector() {
3906 : DCHECK(factory()->array_constructor_protector()->value()->IsSmi());
3907 : DCHECK(IsArrayConstructorIntact());
3908 460 : factory()->array_constructor_protector()->set_value(
3909 690 : Smi::FromInt(kProtectorInvalid));
3910 : DCHECK(!IsArrayConstructorIntact());
3911 230 : }
3912 :
3913 118 : void Isolate::InvalidateArraySpeciesProtector() {
3914 : DCHECK(factory()->array_species_protector()->value()->IsSmi());
3915 : DCHECK(IsArraySpeciesLookupChainIntact());
3916 118 : PropertyCell::SetValueWithInvalidation(
3917 : this, factory()->array_species_protector(),
3918 118 : handle(Smi::FromInt(kProtectorInvalid), this));
3919 : DCHECK(!IsArraySpeciesLookupChainIntact());
3920 118 : }
3921 :
3922 245 : void Isolate::InvalidateTypedArraySpeciesProtector() {
3923 : DCHECK(factory()->typed_array_species_protector()->value()->IsSmi());
3924 : DCHECK(IsTypedArraySpeciesLookupChainIntact());
3925 245 : PropertyCell::SetValueWithInvalidation(
3926 : this, factory()->typed_array_species_protector(),
3927 245 : handle(Smi::FromInt(kProtectorInvalid), this));
3928 : DCHECK(!IsTypedArraySpeciesLookupChainIntact());
3929 245 : }
3930 :
3931 25 : void Isolate::InvalidateRegExpSpeciesProtector() {
3932 : DCHECK(factory()->regexp_species_protector()->value()->IsSmi());
3933 : DCHECK(IsRegExpSpeciesLookupChainIntact());
3934 25 : PropertyCell::SetValueWithInvalidation(
3935 : this, factory()->regexp_species_protector(),
3936 25 : handle(Smi::FromInt(kProtectorInvalid), this));
3937 : DCHECK(!IsRegExpSpeciesLookupChainIntact());
3938 25 : }
3939 :
3940 59 : void Isolate::InvalidatePromiseSpeciesProtector() {
3941 : DCHECK(factory()->promise_species_protector()->value()->IsSmi());
3942 : DCHECK(IsPromiseSpeciesLookupChainIntact());
3943 59 : PropertyCell::SetValueWithInvalidation(
3944 : this, factory()->promise_species_protector(),
3945 59 : handle(Smi::FromInt(kProtectorInvalid), this));
3946 : DCHECK(!IsPromiseSpeciesLookupChainIntact());
3947 59 : }
3948 :
3949 158 : void Isolate::InvalidateStringLengthOverflowProtector() {
3950 : DCHECK(factory()->string_length_protector()->value()->IsSmi());
3951 : DCHECK(IsStringLengthOverflowIntact());
3952 316 : factory()->string_length_protector()->set_value(
3953 474 : Smi::FromInt(kProtectorInvalid));
3954 : DCHECK(!IsStringLengthOverflowIntact());
3955 158 : }
3956 :
3957 107 : void Isolate::InvalidateArrayIteratorProtector() {
3958 : DCHECK(factory()->array_iterator_protector()->value()->IsSmi());
3959 : DCHECK(IsArrayIteratorLookupChainIntact());
3960 107 : PropertyCell::SetValueWithInvalidation(
3961 : this, factory()->array_iterator_protector(),
3962 107 : handle(Smi::FromInt(kProtectorInvalid), this));
3963 : DCHECK(!IsArrayIteratorLookupChainIntact());
3964 107 : }
3965 :
3966 55 : void Isolate::InvalidateMapIteratorProtector() {
3967 : DCHECK(factory()->map_iterator_protector()->value()->IsSmi());
3968 : DCHECK(IsMapIteratorLookupChainIntact());
3969 55 : PropertyCell::SetValueWithInvalidation(
3970 : this, factory()->map_iterator_protector(),
3971 55 : handle(Smi::FromInt(kProtectorInvalid), this));
3972 : DCHECK(!IsMapIteratorLookupChainIntact());
3973 55 : }
3974 :
3975 65 : void Isolate::InvalidateSetIteratorProtector() {
3976 : DCHECK(factory()->set_iterator_protector()->value()->IsSmi());
3977 : DCHECK(IsSetIteratorLookupChainIntact());
3978 65 : PropertyCell::SetValueWithInvalidation(
3979 : this, factory()->set_iterator_protector(),
3980 65 : handle(Smi::FromInt(kProtectorInvalid), this));
3981 : DCHECK(!IsSetIteratorLookupChainIntact());
3982 65 : }
3983 :
3984 25 : void Isolate::InvalidateStringIteratorProtector() {
3985 : DCHECK(factory()->string_iterator_protector()->value()->IsSmi());
3986 : DCHECK(IsStringIteratorLookupChainIntact());
3987 25 : PropertyCell::SetValueWithInvalidation(
3988 : this, factory()->string_iterator_protector(),
3989 25 : handle(Smi::FromInt(kProtectorInvalid), this));
3990 : DCHECK(!IsStringIteratorLookupChainIntact());
3991 25 : }
3992 :
3993 434 : void Isolate::InvalidateArrayBufferDetachingProtector() {
3994 : DCHECK(factory()->array_buffer_detaching_protector()->value()->IsSmi());
3995 : DCHECK(IsArrayBufferDetachingIntact());
3996 434 : PropertyCell::SetValueWithInvalidation(
3997 : this, factory()->array_buffer_detaching_protector(),
3998 434 : handle(Smi::FromInt(kProtectorInvalid), this));
3999 : DCHECK(!IsArrayBufferDetachingIntact());
4000 434 : }
4001 :
4002 2777 : void Isolate::InvalidatePromiseHookProtector() {
4003 : DCHECK(factory()->promise_hook_protector()->value()->IsSmi());
4004 : DCHECK(IsPromiseHookProtectorIntact());
4005 2777 : PropertyCell::SetValueWithInvalidation(
4006 : this, factory()->promise_hook_protector(),
4007 2777 : handle(Smi::FromInt(kProtectorInvalid), this));
4008 : DCHECK(!IsPromiseHookProtectorIntact());
4009 2777 : }
4010 :
4011 0 : void Isolate::InvalidatePromiseResolveProtector() {
4012 : DCHECK(factory()->promise_resolve_protector()->value()->IsSmi());
4013 : DCHECK(IsPromiseResolveLookupChainIntact());
4014 0 : factory()->promise_resolve_protector()->set_value(
4015 0 : Smi::FromInt(kProtectorInvalid));
4016 : DCHECK(!IsPromiseResolveLookupChainIntact());
4017 0 : }
4018 :
4019 103 : void Isolate::InvalidatePromiseThenProtector() {
4020 : DCHECK(factory()->promise_then_protector()->value()->IsSmi());
4021 : DCHECK(IsPromiseThenLookupChainIntact());
4022 103 : PropertyCell::SetValueWithInvalidation(
4023 : this, factory()->promise_then_protector(),
4024 103 : handle(Smi::FromInt(kProtectorInvalid), this));
4025 : DCHECK(!IsPromiseThenLookupChainIntact());
4026 103 : }
4027 :
4028 6490230 : bool Isolate::IsAnyInitialArrayPrototype(Handle<JSArray> array) {
4029 : DisallowHeapAllocation no_gc;
4030 6490230 : return IsInAnyContext(*array, Context::INITIAL_ARRAY_PROTOTYPE_INDEX);
4031 : }
4032 :
4033 126357 : static base::RandomNumberGenerator* ensure_rng_exists(
4034 : base::RandomNumberGenerator** rng, int seed) {
4035 126357 : if (*rng == nullptr) {
4036 61416 : if (seed != 0) {
4037 119872 : *rng = new base::RandomNumberGenerator(seed);
4038 : } else {
4039 1480 : *rng = new base::RandomNumberGenerator();
4040 : }
4041 : }
4042 126357 : return *rng;
4043 : }
4044 :
4045 72377 : base::RandomNumberGenerator* Isolate::random_number_generator() {
4046 : // TODO(bmeurer) Initialized lazily because it depends on flags; can
4047 : // be fixed once the default isolate cleanup is done.
4048 126357 : return ensure_rng_exists(&random_number_generator_, FLAG_random_seed);
4049 : }
4050 :
4051 0 : base::RandomNumberGenerator* Isolate::fuzzer_rng() {
4052 0 : if (fuzzer_rng_ == nullptr) {
4053 0 : int64_t seed = FLAG_fuzzer_random_seed;
4054 0 : if (seed == 0) {
4055 : seed = random_number_generator()->initial_seed();
4056 : }
4057 :
4058 0 : fuzzer_rng_ = new base::RandomNumberGenerator(seed);
4059 : }
4060 :
4061 0 : return fuzzer_rng_;
4062 : }
4063 :
4064 53980 : int Isolate::GenerateIdentityHash(uint32_t mask) {
4065 : int hash;
4066 : int attempts = 0;
4067 53980 : do {
4068 53980 : hash = random_number_generator()->NextInt() & mask;
4069 53980 : } while (hash == 0 && attempts++ < 30);
4070 53980 : return hash != 0 ? hash : 1;
4071 : }
4072 :
4073 25129 : Code Isolate::FindCodeObject(Address a) {
4074 25129 : return heap()->GcSafeFindCodeForInnerPointer(a);
4075 : }
4076 :
4077 :
4078 : #ifdef DEBUG
4079 : #define ISOLATE_FIELD_OFFSET(type, name, ignored) \
4080 : const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);
4081 : ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
4082 : ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
4083 : #undef ISOLATE_FIELD_OFFSET
4084 : #endif
4085 :
4086 254999 : Handle<Symbol> Isolate::SymbolFor(RootIndex dictionary_index,
4087 : Handle<String> name, bool private_symbol) {
4088 254999 : Handle<String> key = factory()->InternalizeString(name);
4089 : Handle<NameDictionary> dictionary =
4090 : Handle<NameDictionary>::cast(root_handle(dictionary_index));
4091 254999 : int entry = dictionary->FindEntry(this, key);
4092 : Handle<Symbol> symbol;
4093 254999 : if (entry == NameDictionary::kNotFound) {
4094 : symbol =
4095 2715 : private_symbol ? factory()->NewPrivateSymbol() : factory()->NewSymbol();
4096 5430 : symbol->set_name(*key);
4097 : dictionary = NameDictionary::Add(this, dictionary, key, symbol,
4098 2715 : PropertyDetails::Empty(), &entry);
4099 2715 : switch (dictionary_index) {
4100 : case RootIndex::kPublicSymbolTable:
4101 : symbol->set_is_public(true);
4102 : heap()->set_public_symbol_table(*dictionary);
4103 : break;
4104 : case RootIndex::kApiSymbolTable:
4105 : heap()->set_api_symbol_table(*dictionary);
4106 : break;
4107 : case RootIndex::kApiPrivateSymbolTable:
4108 : heap()->set_api_private_symbol_table(*dictionary);
4109 : break;
4110 : default:
4111 0 : UNREACHABLE();
4112 : }
4113 : } else {
4114 504568 : symbol = Handle<Symbol>(Symbol::cast(dictionary->ValueAt(entry)), this);
4115 : }
4116 254999 : return symbol;
4117 : }
4118 :
4119 15 : void Isolate::AddBeforeCallEnteredCallback(BeforeCallEnteredCallback callback) {
4120 : auto pos = std::find(before_call_entered_callbacks_.begin(),
4121 15 : before_call_entered_callbacks_.end(), callback);
4122 20 : if (pos != before_call_entered_callbacks_.end()) return;
4123 10 : before_call_entered_callbacks_.push_back(callback);
4124 : }
4125 :
4126 5 : void Isolate::RemoveBeforeCallEnteredCallback(
4127 : BeforeCallEnteredCallback callback) {
4128 : auto pos = std::find(before_call_entered_callbacks_.begin(),
4129 5 : before_call_entered_callbacks_.end(), callback);
4130 5 : if (pos == before_call_entered_callbacks_.end()) return;
4131 5 : before_call_entered_callbacks_.erase(pos);
4132 : }
4133 :
4134 65 : void Isolate::AddCallCompletedCallback(CallCompletedCallback callback) {
4135 : auto pos = std::find(call_completed_callbacks_.begin(),
4136 65 : call_completed_callbacks_.end(), callback);
4137 70 : if (pos != call_completed_callbacks_.end()) return;
4138 60 : call_completed_callbacks_.push_back(callback);
4139 : }
4140 :
4141 3717 : void Isolate::RemoveCallCompletedCallback(CallCompletedCallback callback) {
4142 : auto pos = std::find(call_completed_callbacks_.begin(),
4143 3717 : call_completed_callbacks_.end(), callback);
4144 3717 : if (pos == call_completed_callbacks_.end()) return;
4145 45 : call_completed_callbacks_.erase(pos);
4146 : }
4147 :
4148 5425377 : void Isolate::FireCallCompletedCallback(MicrotaskQueue* microtask_queue) {
4149 10850720 : if (!handle_scope_implementer()->CallDepthIsZero()) return;
4150 :
4151 : bool run_microtasks =
4152 545518 : microtask_queue && microtask_queue->size() &&
4153 572561 : !microtask_queue->HasMicrotasksSuppressions() &&
4154 : microtask_queue->microtasks_policy() == v8::MicrotasksPolicy::kAuto;
4155 :
4156 545518 : if (run_microtasks) {
4157 1948 : microtask_queue->RunMicrotasks(this);
4158 : } else {
4159 : // TODO(marja): (spec) The discussion about when to clear the KeepDuringJob
4160 : // set is still open (whether to clear it after every microtask or once
4161 : // during a microtask checkpoint). See also
4162 : // https://github.com/tc39/proposal-weakrefs/issues/39 .
4163 543570 : heap()->ClearKeepDuringJobSet();
4164 : }
4165 :
4166 545514 : if (call_completed_callbacks_.empty()) return;
4167 : // Fire callbacks. Increase call depth to prevent recursive callbacks.
4168 : v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(this);
4169 60 : v8::Isolate::SuppressMicrotaskExecutionScope suppress(isolate);
4170 30 : std::vector<CallCompletedCallback> callbacks(call_completed_callbacks_);
4171 65 : for (auto& callback : callbacks) {
4172 35 : callback(reinterpret_cast<v8::Isolate*>(this));
4173 : }
4174 : }
4175 :
4176 8457 : void Isolate::PromiseHookStateUpdated() {
4177 : bool promise_hook_or_async_event_delegate =
4178 8457 : promise_hook_ || async_event_delegate_;
4179 : bool promise_hook_or_debug_is_active_or_async_event_delegate =
4180 8457 : promise_hook_or_async_event_delegate || debug()->is_active();
4181 12936 : if (promise_hook_or_debug_is_active_or_async_event_delegate &&
4182 : IsPromiseHookProtectorIntact()) {
4183 : HandleScope scope(this);
4184 2776 : InvalidatePromiseHookProtector();
4185 : }
4186 8457 : promise_hook_or_async_event_delegate_ = promise_hook_or_async_event_delegate;
4187 : promise_hook_or_debug_is_active_or_async_event_delegate_ =
4188 8457 : promise_hook_or_debug_is_active_or_async_event_delegate;
4189 8457 : }
4190 :
4191 : namespace {
4192 :
4193 72 : MaybeHandle<JSPromise> NewRejectedPromise(Isolate* isolate,
4194 : v8::Local<v8::Context> api_context,
4195 : Handle<Object> exception) {
4196 : v8::Local<v8::Promise::Resolver> resolver;
4197 144 : ASSIGN_RETURN_ON_SCHEDULED_EXCEPTION_VALUE(
4198 : isolate, resolver, v8::Promise::Resolver::New(api_context),
4199 : MaybeHandle<JSPromise>());
4200 :
4201 144 : RETURN_ON_SCHEDULED_EXCEPTION_VALUE(
4202 : isolate, resolver->Reject(api_context, v8::Utils::ToLocal(exception)),
4203 : MaybeHandle<JSPromise>());
4204 :
4205 72 : v8::Local<v8::Promise> promise = resolver->GetPromise();
4206 72 : return v8::Utils::OpenHandle(*promise);
4207 : }
4208 :
4209 : } // namespace
4210 :
4211 482 : MaybeHandle<JSPromise> Isolate::RunHostImportModuleDynamicallyCallback(
4212 : Handle<Script> referrer, Handle<Object> specifier) {
4213 : v8::Local<v8::Context> api_context =
4214 482 : v8::Utils::ToLocal(Handle<Context>(native_context()));
4215 :
4216 482 : if (host_import_module_dynamically_callback_ == nullptr) {
4217 : Handle<Object> exception =
4218 0 : factory()->NewError(error_function(), MessageTemplate::kUnsupported);
4219 0 : return NewRejectedPromise(this, api_context, exception);
4220 : }
4221 :
4222 : Handle<String> specifier_str;
4223 482 : MaybeHandle<String> maybe_specifier = Object::ToString(this, specifier);
4224 482 : if (!maybe_specifier.ToHandle(&specifier_str)) {
4225 : Handle<Object> exception(pending_exception(), this);
4226 : clear_pending_exception();
4227 :
4228 72 : return NewRejectedPromise(this, api_context, exception);
4229 : }
4230 : DCHECK(!has_pending_exception());
4231 :
4232 : v8::Local<v8::Promise> promise;
4233 820 : ASSIGN_RETURN_ON_SCHEDULED_EXCEPTION_VALUE(
4234 : this, promise,
4235 : host_import_module_dynamically_callback_(
4236 : api_context, v8::Utils::ScriptOrModuleToLocal(referrer),
4237 : v8::Utils::ToLocal(specifier_str)),
4238 : MaybeHandle<JSPromise>());
4239 410 : return v8::Utils::OpenHandle(*promise);
4240 : }
4241 :
4242 30493 : void Isolate::SetHostImportModuleDynamicallyCallback(
4243 : HostImportModuleDynamicallyCallback callback) {
4244 30493 : host_import_module_dynamically_callback_ = callback;
4245 30493 : }
4246 :
4247 39 : Handle<JSObject> Isolate::RunHostInitializeImportMetaObjectCallback(
4248 : Handle<Module> module) {
4249 : Handle<Object> host_meta(module->import_meta(), this);
4250 39 : if (host_meta->IsTheHole(this)) {
4251 23 : host_meta = factory()->NewJSObjectWithNullProto();
4252 23 : if (host_initialize_import_meta_object_callback_ != nullptr) {
4253 : v8::Local<v8::Context> api_context =
4254 23 : v8::Utils::ToLocal(Handle<Context>(native_context()));
4255 23 : host_initialize_import_meta_object_callback_(
4256 : api_context, Utils::ToLocal(module),
4257 23 : v8::Local<v8::Object>::Cast(v8::Utils::ToLocal(host_meta)));
4258 : }
4259 23 : module->set_import_meta(*host_meta);
4260 : }
4261 39 : return Handle<JSObject>::cast(host_meta);
4262 : }
4263 :
4264 30493 : void Isolate::SetHostInitializeImportMetaObjectCallback(
4265 : HostInitializeImportMetaObjectCallback callback) {
4266 30493 : host_initialize_import_meta_object_callback_ = callback;
4267 30493 : }
4268 :
4269 12 : MaybeHandle<Object> Isolate::RunPrepareStackTraceCallback(
4270 : Handle<Context> context, Handle<JSObject> error, Handle<JSArray> sites) {
4271 12 : v8::Local<v8::Context> api_context = Utils::ToLocal(context);
4272 :
4273 : v8::Local<v8::Value> stack;
4274 42 : ASSIGN_RETURN_ON_SCHEDULED_EXCEPTION_VALUE(
4275 : this, stack,
4276 : prepare_stack_trace_callback_(api_context, Utils::ToLocal(error),
4277 : Utils::ToLocal(sites)),
4278 : MaybeHandle<Object>());
4279 6 : return Utils::OpenHandle(*stack);
4280 : }
4281 :
4282 863532 : int Isolate::LookupOrAddExternallyCompiledFilename(const char* filename) {
4283 863532 : if (embedded_file_writer_ != nullptr) {
4284 : return embedded_file_writer_->LookupOrAddExternallyCompiledFilename(
4285 15419 : filename);
4286 : }
4287 : return 0;
4288 : }
4289 :
4290 0 : const char* Isolate::GetExternallyCompiledFilename(int index) const {
4291 0 : if (embedded_file_writer_ != nullptr) {
4292 0 : return embedded_file_writer_->GetExternallyCompiledFilename(index);
4293 : }
4294 : return "";
4295 : }
4296 :
4297 0 : int Isolate::GetExternallyCompiledFilenameCount() const {
4298 0 : if (embedded_file_writer_ != nullptr) {
4299 0 : return embedded_file_writer_->GetExternallyCompiledFilenameCount();
4300 : }
4301 : return 0;
4302 : }
4303 :
4304 0 : void Isolate::PrepareBuiltinSourcePositionMap() {
4305 56 : if (embedded_file_writer_ != nullptr) {
4306 : return embedded_file_writer_->PrepareBuiltinSourcePositionMap(
4307 2 : this->builtins());
4308 : }
4309 : }
4310 :
4311 12 : void Isolate::SetPrepareStackTraceCallback(PrepareStackTraceCallback callback) {
4312 12 : prepare_stack_trace_callback_ = callback;
4313 12 : }
4314 :
4315 15186 : bool Isolate::HasPrepareStackTraceCallback() const {
4316 15186 : return prepare_stack_trace_callback_ != nullptr;
4317 : }
4318 :
4319 13 : void Isolate::SetAtomicsWaitCallback(v8::Isolate::AtomicsWaitCallback callback,
4320 : void* data) {
4321 13 : atomics_wait_callback_ = callback;
4322 13 : atomics_wait_callback_data_ = data;
4323 13 : }
4324 :
4325 1833 : void Isolate::RunAtomicsWaitCallback(v8::Isolate::AtomicsWaitEvent event,
4326 : Handle<JSArrayBuffer> array_buffer,
4327 : size_t offset_in_bytes, int64_t value,
4328 : double timeout_in_ms,
4329 : AtomicsWaitWakeHandle* stop_handle) {
4330 : DCHECK(array_buffer->is_shared());
4331 1833 : if (atomics_wait_callback_ == nullptr) return;
4332 : HandleScope handle_scope(this);
4333 169 : atomics_wait_callback_(
4334 : event, v8::Utils::ToLocalShared(array_buffer), offset_in_bytes, value,
4335 : timeout_in_ms,
4336 : reinterpret_cast<v8::Isolate::AtomicsWaitWakeHandle*>(stop_handle),
4337 169 : atomics_wait_callback_data_);
4338 : }
4339 :
4340 119 : void Isolate::SetPromiseHook(PromiseHook hook) {
4341 119 : promise_hook_ = hook;
4342 119 : PromiseHookStateUpdated();
4343 119 : }
4344 :
4345 99015 : void Isolate::RunPromiseHook(PromiseHookType type, Handle<JSPromise> promise,
4346 : Handle<Object> parent) {
4347 99015 : RunPromiseHookForAsyncEventDelegate(type, promise);
4348 99015 : if (promise_hook_ == nullptr) return;
4349 : promise_hook_(type, v8::Utils::PromiseToLocal(promise),
4350 1145 : v8::Utils::ToLocal(parent));
4351 : }
4352 :
4353 99015 : void Isolate::RunPromiseHookForAsyncEventDelegate(PromiseHookType type,
4354 : Handle<JSPromise> promise) {
4355 99015 : if (!async_event_delegate_) return;
4356 37139 : if (type == PromiseHookType::kResolve) return;
4357 :
4358 21822 : if (type == PromiseHookType::kBefore) {
4359 3655 : if (!promise->async_task_id()) return;
4360 6345 : async_event_delegate_->AsyncEventOccurred(debug::kDebugWillHandle,
4361 4230 : promise->async_task_id(), false);
4362 18167 : } else if (type == PromiseHookType::kAfter) {
4363 3650 : if (!promise->async_task_id()) return;
4364 6300 : async_event_delegate_->AsyncEventOccurred(debug::kDebugDidHandle,
4365 4200 : promise->async_task_id(), false);
4366 : } else {
4367 : DCHECK(type == PromiseHookType::kInit);
4368 : debug::DebugAsyncActionType type = debug::kDebugPromiseThen;
4369 : bool last_frame_was_promise_builtin = false;
4370 14517 : JavaScriptFrameIterator it(this);
4371 28649 : while (!it.done()) {
4372 : std::vector<Handle<SharedFunctionInfo>> infos;
4373 26474 : it.frame()->GetFunctions(&infos);
4374 54738 : for (size_t i = 1; i <= infos.size(); ++i) {
4375 52948 : Handle<SharedFunctionInfo> info = infos[infos.size() - i];
4376 26474 : if (info->IsUserJavaScript()) {
4377 : // We should not report PromiseThen and PromiseCatch which is called
4378 : // indirectly, e.g. Promise.all calls Promise.then internally.
4379 12342 : if (last_frame_was_promise_builtin) {
4380 1855 : if (!promise->async_task_id()) {
4381 3710 : promise->set_async_task_id(++async_task_count_);
4382 : }
4383 7420 : async_event_delegate_->AsyncEventOccurred(
4384 3710 : type, promise->async_task_id(), debug()->IsBlackboxed(info));
4385 : }
4386 : return;
4387 : }
4388 : last_frame_was_promise_builtin = false;
4389 14132 : if (info->HasBuiltinId()) {
4390 14132 : if (info->builtin_id() == Builtins::kPromisePrototypeThen) {
4391 : type = debug::kDebugPromiseThen;
4392 : last_frame_was_promise_builtin = true;
4393 10782 : } else if (info->builtin_id() == Builtins::kPromisePrototypeCatch) {
4394 : type = debug::kDebugPromiseCatch;
4395 : last_frame_was_promise_builtin = true;
4396 10482 : } else if (info->builtin_id() == Builtins::kPromisePrototypeFinally) {
4397 : type = debug::kDebugPromiseFinally;
4398 : last_frame_was_promise_builtin = true;
4399 : }
4400 : }
4401 : }
4402 14132 : it.Advance();
4403 : }
4404 : }
4405 : }
4406 :
4407 3692 : void Isolate::OnAsyncFunctionStateChanged(Handle<JSPromise> promise,
4408 : debug::DebugAsyncActionType event) {
4409 3692 : if (!async_event_delegate_) return;
4410 440 : if (!promise->async_task_id()) {
4411 370 : promise->set_async_task_id(++async_task_count_);
4412 : }
4413 1320 : async_event_delegate_->AsyncEventOccurred(event, promise->async_task_id(),
4414 880 : false);
4415 : }
4416 :
4417 1150 : void Isolate::SetPromiseRejectCallback(PromiseRejectCallback callback) {
4418 1150 : promise_reject_callback_ = callback;
4419 1150 : }
4420 :
4421 15573 : void Isolate::ReportPromiseReject(Handle<JSPromise> promise,
4422 : Handle<Object> value,
4423 : v8::PromiseRejectEvent event) {
4424 15573 : if (promise_reject_callback_ == nullptr) return;
4425 490 : promise_reject_callback_(v8::PromiseRejectMessage(
4426 490 : v8::Utils::PromiseToLocal(promise), event, v8::Utils::ToLocal(value)));
4427 : }
4428 :
4429 60 : void Isolate::SetUseCounterCallback(v8::Isolate::UseCounterCallback callback) {
4430 : DCHECK(!use_counter_callback_);
4431 60 : use_counter_callback_ = callback;
4432 60 : }
4433 :
4434 :
4435 2337526 : void Isolate::CountUsage(v8::Isolate::UseCounterFeature feature) {
4436 : // The counter callback may cause the embedder to call into V8, which is not
4437 : // generally possible during GC.
4438 2337526 : if (heap_.gc_state() == Heap::NOT_IN_GC) {
4439 2337526 : if (use_counter_callback_) {
4440 : HandleScope handle_scope(this);
4441 199 : use_counter_callback_(reinterpret_cast<v8::Isolate*>(this), feature);
4442 : }
4443 : } else {
4444 0 : heap_.IncrementDeferredCount(feature);
4445 : }
4446 2337526 : }
4447 :
4448 : // static
4449 15 : std::string Isolate::GetTurboCfgFileName(Isolate* isolate) {
4450 15 : if (FLAG_trace_turbo_cfg_file == nullptr) {
4451 0 : std::ostringstream os;
4452 0 : os << "turbo-" << base::OS::GetCurrentProcessId() << "-";
4453 0 : if (isolate != nullptr) {
4454 0 : os << isolate->id();
4455 : } else {
4456 0 : os << "any";
4457 : }
4458 0 : os << ".cfg";
4459 : return os.str();
4460 : } else {
4461 15 : return FLAG_trace_turbo_cfg_file;
4462 : }
4463 : }
4464 :
4465 : // Heap::detached_contexts tracks detached contexts as pairs
4466 : // (number of GC since the context was detached, the context).
4467 121 : void Isolate::AddDetachedContext(Handle<Context> context) {
4468 : HandleScope scope(this);
4469 : Handle<WeakArrayList> detached_contexts = factory()->detached_contexts();
4470 : detached_contexts = WeakArrayList::AddToEnd(
4471 121 : this, detached_contexts, MaybeObjectHandle(Smi::kZero, this));
4472 : detached_contexts = WeakArrayList::AddToEnd(this, detached_contexts,
4473 121 : MaybeObjectHandle::Weak(context));
4474 : heap()->set_detached_contexts(*detached_contexts);
4475 121 : }
4476 :
4477 :
4478 73955 : void Isolate::CheckDetachedContextsAfterGC() {
4479 : HandleScope scope(this);
4480 : Handle<WeakArrayList> detached_contexts = factory()->detached_contexts();
4481 : int length = detached_contexts->length();
4482 73955 : if (length == 0) return;
4483 : int new_length = 0;
4484 658 : for (int i = 0; i < length; i += 2) {
4485 : int mark_sweeps = detached_contexts->Get(i).ToSmi().value();
4486 : MaybeObject context = detached_contexts->Get(i + 1);
4487 : DCHECK(context->IsWeakOrCleared());
4488 298 : if (!context->IsCleared()) {
4489 732 : detached_contexts->Set(
4490 244 : new_length, MaybeObject::FromSmi(Smi::FromInt(mark_sweeps + 1)));
4491 488 : detached_contexts->Set(new_length + 1, context);
4492 244 : new_length += 2;
4493 : }
4494 : }
4495 : detached_contexts->set_length(new_length);
4496 278 : while (new_length < length) {
4497 108 : detached_contexts->Set(new_length, MaybeObject::FromSmi(Smi::zero()));
4498 108 : ++new_length;
4499 : }
4500 :
4501 62 : if (FLAG_trace_detached_contexts) {
4502 0 : PrintF("%d detached contexts are collected out of %d\n",
4503 0 : length - new_length, length);
4504 0 : for (int i = 0; i < new_length; i += 2) {
4505 : int mark_sweeps = detached_contexts->Get(i).ToSmi().value();
4506 : MaybeObject context = detached_contexts->Get(i + 1);
4507 : DCHECK(context->IsWeakOrCleared());
4508 0 : if (mark_sweeps > 3) {
4509 0 : PrintF("detached context %p\n survived %d GCs (leak?)\n",
4510 0 : reinterpret_cast<void*>(context.ptr()), mark_sweeps);
4511 : }
4512 : }
4513 : }
4514 : }
4515 :
4516 0 : double Isolate::LoadStartTimeMs() {
4517 0 : base::MutexGuard guard(&rail_mutex_);
4518 0 : return load_start_time_ms_;
4519 : }
4520 :
4521 0 : void Isolate::SetRAILMode(RAILMode rail_mode) {
4522 : RAILMode old_rail_mode = rail_mode_.load();
4523 0 : if (old_rail_mode != PERFORMANCE_LOAD && rail_mode == PERFORMANCE_LOAD) {
4524 0 : base::MutexGuard guard(&rail_mutex_);
4525 0 : load_start_time_ms_ = heap()->MonotonicallyIncreasingTimeInMs();
4526 : }
4527 : rail_mode_.store(rail_mode);
4528 0 : if (old_rail_mode == PERFORMANCE_LOAD && rail_mode != PERFORMANCE_LOAD) {
4529 : heap()->incremental_marking()->incremental_marking_job()->ScheduleTask(
4530 0 : heap());
4531 : }
4532 0 : if (FLAG_trace_rail) {
4533 0 : PrintIsolate(this, "RAIL mode: %s\n", RAILModeName(rail_mode));
4534 : }
4535 0 : }
4536 :
4537 0 : void Isolate::IsolateInBackgroundNotification() {
4538 0 : is_isolate_in_background_ = true;
4539 0 : heap()->ActivateMemoryReducerIfNeeded();
4540 0 : }
4541 :
4542 0 : void Isolate::IsolateInForegroundNotification() {
4543 0 : is_isolate_in_background_ = false;
4544 0 : }
4545 :
4546 94 : void Isolate::PrintWithTimestamp(const char* format, ...) {
4547 94 : base::OS::Print("[%d:%p] %8.0f ms: ", base::OS::GetCurrentProcessId(),
4548 94 : static_cast<void*>(this), time_millis_since_init());
4549 : va_list arguments;
4550 94 : va_start(arguments, format);
4551 94 : base::OS::VPrint(format, arguments);
4552 94 : va_end(arguments);
4553 94 : }
4554 :
4555 10 : void Isolate::SetIdle(bool is_idle) {
4556 10 : if (!is_profiling()) return;
4557 : StateTag state = current_vm_state();
4558 : DCHECK(state == EXTERNAL || state == IDLE);
4559 10 : if (js_entry_sp() != kNullAddress) return;
4560 10 : if (is_idle) {
4561 : set_current_vm_state(IDLE);
4562 5 : } else if (state == IDLE) {
4563 : set_current_vm_state(EXTERNAL);
4564 : }
4565 : }
4566 :
4567 : #ifdef V8_INTL_SUPPORT
4568 64688 : icu::UObject* Isolate::get_cached_icu_object(ICUObjectCacheType cache_type) {
4569 64688 : return icu_object_cache_[cache_type].get();
4570 : }
4571 :
4572 104 : void Isolate::set_icu_object_in_cache(ICUObjectCacheType cache_type,
4573 : std::shared_ptr<icu::UObject> obj) {
4574 : icu_object_cache_[cache_type] = obj;
4575 104 : }
4576 :
4577 0 : void Isolate::clear_cached_icu_object(ICUObjectCacheType cache_type) {
4578 : icu_object_cache_.erase(cache_type);
4579 0 : }
4580 : #endif // V8_INTL_SUPPORT
4581 :
4582 2691266 : bool StackLimitCheck::JsHasOverflowed(uintptr_t gap) const {
4583 2691266 : StackGuard* stack_guard = isolate_->stack_guard();
4584 : #ifdef USE_SIMULATOR
4585 : // The simulator uses a separate JS stack.
4586 : Address jssp_address = Simulator::current(isolate_)->get_sp();
4587 : uintptr_t jssp = static_cast<uintptr_t>(jssp_address);
4588 : if (jssp - gap < stack_guard->real_jslimit()) return true;
4589 : #endif // USE_SIMULATOR
4590 2691266 : return GetCurrentStackPosition() - gap < stack_guard->real_climit();
4591 : }
4592 :
4593 20559700 : SaveContext::SaveContext(Isolate* isolate) : isolate_(isolate) {
4594 20559700 : if (!isolate->context().is_null()) {
4595 20356053 : context_ = Handle<Context>(isolate->context(), isolate);
4596 : }
4597 :
4598 20559710 : c_entry_fp_ = isolate->c_entry_fp(isolate->thread_local_top());
4599 20559710 : }
4600 :
4601 41119416 : SaveContext::~SaveContext() {
4602 41119416 : isolate_->set_context(context_.is_null() ? Context() : *context_);
4603 20559708 : }
4604 :
4605 0 : bool SaveContext::IsBelowFrame(StandardFrame* frame) {
4606 0 : return (c_entry_fp_ == 0) || (c_entry_fp_ > frame->sp());
4607 : }
4608 :
4609 370680 : SaveAndSwitchContext::SaveAndSwitchContext(Isolate* isolate,
4610 : Context new_context)
4611 370680 : : SaveContext(isolate) {
4612 : isolate->set_context(new_context);
4613 370680 : }
4614 :
4615 : #ifdef DEBUG
4616 : AssertNoContextChange::AssertNoContextChange(Isolate* isolate)
4617 : : isolate_(isolate), context_(isolate->context(), isolate) {}
4618 : #endif // DEBUG
4619 :
4620 73350 : bool InterruptsScope::Intercept(StackGuard::InterruptFlag flag) {
4621 : InterruptsScope* last_postpone_scope = nullptr;
4622 220462 : for (InterruptsScope* current = this; current; current = current->prev_) {
4623 : // We only consider scopes related to passed flag.
4624 73718 : if (!(current->intercept_mask_ & flag)) continue;
4625 73324 : if (current->mode_ == kRunInterrupts) {
4626 : // If innermost scope is kRunInterrupts scope, prevent interrupt from
4627 : // being intercepted.
4628 : break;
4629 : } else {
4630 : DCHECK_EQ(current->mode_, kPostponeInterrupts);
4631 : last_postpone_scope = current;
4632 : }
4633 : }
4634 : // If there is no postpone scope for passed flag then we should not intercept.
4635 73350 : if (!last_postpone_scope) return false;
4636 72905 : last_postpone_scope->intercepted_flags_ |= flag;
4637 72905 : return true;
4638 : }
4639 :
4640 : #undef TRACE_ISOLATE
4641 :
4642 : } // namespace internal
4643 120216 : } // namespace v8
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