1 // Copyright 2016 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/snapshot/code-serializer.h"
6
7 #include <memory>
8
9 #include "src/code-stubs.h"
10 #include "src/counters.h"
11 #include "src/debug/debug.h"
12 #include "src/log.h"
13 #include "src/macro-assembler.h"
14 #include "src/objects-inl.h"
15 #include "src/snapshot/object-deserializer.h"
16 #include "src/snapshot/snapshot.h"
17 #include "src/version.h"
18 #include "src/visitors.h"
19
20 namespace v8 {
21 namespace internal {
22
ScriptData(const byte * data,int length)23 ScriptData::ScriptData(const byte* data, int length)
24 : owns_data_(false), rejected_(false), data_(data), length_(length) {
25 if (!IsAligned(reinterpret_cast<intptr_t>(data), kPointerAlignment)) {
26 byte* copy = NewArray<byte>(length);
27 DCHECK(IsAligned(reinterpret_cast<intptr_t>(copy), kPointerAlignment));
28 CopyBytes(copy, data, length);
29 data_ = copy;
30 AcquireDataOwnership();
31 }
32 }
33
CodeSerializer(Isolate * isolate,uint32_t source_hash)34 CodeSerializer::CodeSerializer(Isolate* isolate, uint32_t source_hash)
35 : Serializer(isolate), source_hash_(source_hash) {
36 allocator()->UseCustomChunkSize(FLAG_serialization_chunk_size);
37 }
38
39 // static
Serialize(Handle<SharedFunctionInfo> info)40 ScriptCompiler::CachedData* CodeSerializer::Serialize(
41 Handle<SharedFunctionInfo> info) {
42 Isolate* isolate = info->GetIsolate();
43 TRACE_EVENT_CALL_STATS_SCOPED(isolate, "v8", "V8.Execute");
44 HistogramTimerScope histogram_timer(isolate->counters()->compile_serialize());
45 RuntimeCallTimerScope runtimeTimer(isolate,
46 RuntimeCallCounterId::kCompileSerialize);
47 TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.compile"), "V8.CompileSerialize");
48
49 base::ElapsedTimer timer;
50 if (FLAG_profile_deserialization) timer.Start();
51 Handle<Script> script(Script::cast(info->script()), isolate);
52 if (FLAG_trace_serializer) {
53 PrintF("[Serializing from");
54 script->name()->ShortPrint();
55 PrintF("]\n");
56 }
57 // TODO(7110): Enable serialization of Asm modules once the AsmWasmData is
58 // context independent.
59 if (script->ContainsAsmModule()) return nullptr;
60
61 isolate->heap()->read_only_space()->ClearStringPaddingIfNeeded();
62
63 // Serialize code object.
64 Handle<String> source(String::cast(script->source()), isolate);
65 CodeSerializer cs(isolate, SerializedCodeData::SourceHash(
66 source, script->origin_options()));
67 DisallowHeapAllocation no_gc;
68 cs.reference_map()->AddAttachedReference(*source);
69 ScriptData* script_data = cs.SerializeSharedFunctionInfo(info);
70
71 if (FLAG_profile_deserialization) {
72 double ms = timer.Elapsed().InMillisecondsF();
73 int length = script_data->length();
74 PrintF("[Serializing to %d bytes took %0.3f ms]\n", length, ms);
75 }
76
77 ScriptCompiler::CachedData* result =
78 new ScriptCompiler::CachedData(script_data->data(), script_data->length(),
79 ScriptCompiler::CachedData::BufferOwned);
80 script_data->ReleaseDataOwnership();
81 delete script_data;
82
83 return result;
84 }
85
SerializeSharedFunctionInfo(Handle<SharedFunctionInfo> info)86 ScriptData* CodeSerializer::SerializeSharedFunctionInfo(
87 Handle<SharedFunctionInfo> info) {
88 DisallowHeapAllocation no_gc;
89
90 VisitRootPointer(Root::kHandleScope, nullptr,
91 Handle<Object>::cast(info).location());
92 SerializeDeferredObjects();
93 Pad();
94
95 SerializedCodeData data(sink_.data(), this);
96
97 return data.GetScriptData();
98 }
99
SerializeReadOnlyObject(HeapObject * obj,HowToCode how_to_code,WhereToPoint where_to_point,int skip)100 bool CodeSerializer::SerializeReadOnlyObject(HeapObject* obj,
101 HowToCode how_to_code,
102 WhereToPoint where_to_point,
103 int skip) {
104 PagedSpace* read_only_space = isolate()->heap()->read_only_space();
105 if (!read_only_space->Contains(obj)) return false;
106
107 // For objects in RO_SPACE, never serialize the object, but instead create a
108 // back reference that encodes the page number as the chunk_index and the
109 // offset within the page as the chunk_offset.
110 Address address = obj->address();
111 Page* page = Page::FromAddress(address);
112 uint32_t chunk_index = 0;
113 for (Page* p : *read_only_space) {
114 if (p == page) break;
115 ++chunk_index;
116 }
117 uint32_t chunk_offset = static_cast<uint32_t>(page->Offset(address));
118 SerializerReference back_reference =
119 SerializerReference::BackReference(RO_SPACE, chunk_index, chunk_offset);
120 reference_map()->Add(obj, back_reference);
121 CHECK(SerializeBackReference(obj, how_to_code, where_to_point, skip));
122 return true;
123 }
124
SerializeObject(HeapObject * obj,HowToCode how_to_code,WhereToPoint where_to_point,int skip)125 void CodeSerializer::SerializeObject(HeapObject* obj, HowToCode how_to_code,
126 WhereToPoint where_to_point, int skip) {
127 if (SerializeHotObject(obj, how_to_code, where_to_point, skip)) return;
128
129 int root_index = root_index_map()->Lookup(obj);
130 if (root_index != RootIndexMap::kInvalidRootIndex) {
131 PutRoot(root_index, obj, how_to_code, where_to_point, skip);
132 return;
133 }
134
135 if (SerializeBackReference(obj, how_to_code, where_to_point, skip)) return;
136
137 if (SerializeReadOnlyObject(obj, how_to_code, where_to_point, skip)) return;
138
139 FlushSkip(skip);
140
141 if (obj->IsCode()) {
142 Code* code_object = Code::cast(obj);
143 switch (code_object->kind()) {
144 case Code::OPTIMIZED_FUNCTION: // No optimized code compiled yet.
145 case Code::REGEXP: // No regexp literals initialized yet.
146 case Code::NUMBER_OF_KINDS: // Pseudo enum value.
147 case Code::BYTECODE_HANDLER: // No direct references to handlers.
148 break; // hit UNREACHABLE below.
149 case Code::BUILTIN:
150 SerializeBuiltinReference(code_object, how_to_code, where_to_point, 0);
151 return;
152 case Code::STUB:
153 if (code_object->builtin_index() == -1) {
154 SerializeCodeStub(code_object, how_to_code, where_to_point);
155 } else {
156 SerializeBuiltinReference(code_object, how_to_code, where_to_point,
157 0);
158 }
159 return;
160 default:
161 return SerializeCodeObject(code_object, how_to_code, where_to_point);
162 }
163 UNREACHABLE();
164 }
165
166 ReadOnlyRoots roots(isolate());
167 if (ElideObject(obj)) {
168 return SerializeObject(roots.undefined_value(), how_to_code, where_to_point,
169 skip);
170 }
171
172 if (obj->IsScript()) {
173 Script* script_obj = Script::cast(obj);
174 DCHECK_NE(script_obj->compilation_type(), Script::COMPILATION_TYPE_EVAL);
175 // We want to differentiate between undefined and uninitialized_symbol for
176 // context_data for now. It is hack to allow debugging for scripts that are
177 // included as a part of custom snapshot. (see debug::Script::IsEmbedded())
178 Object* context_data = script_obj->context_data();
179 if (context_data != roots.undefined_value() &&
180 context_data != roots.uninitialized_symbol()) {
181 script_obj->set_context_data(roots.undefined_value());
182 }
183 // We don't want to serialize host options to avoid serializing unnecessary
184 // object graph.
185 FixedArray* host_options = script_obj->host_defined_options();
186 script_obj->set_host_defined_options(roots.empty_fixed_array());
187 SerializeGeneric(obj, how_to_code, where_to_point);
188 script_obj->set_host_defined_options(host_options);
189 script_obj->set_context_data(context_data);
190 return;
191 }
192
193 if (obj->IsSharedFunctionInfo()) {
194 SharedFunctionInfo* sfi = SharedFunctionInfo::cast(obj);
195 // TODO(7110): Enable serializing of Asm modules once the AsmWasmData
196 // is context independent.
197 DCHECK(!sfi->IsApiFunction() && !sfi->HasAsmWasmData());
198
199 DebugInfo* debug_info = nullptr;
200 BytecodeArray* debug_bytecode_array = nullptr;
201 if (sfi->HasDebugInfo()) {
202 // Clear debug info.
203 debug_info = sfi->GetDebugInfo();
204 if (debug_info->HasInstrumentedBytecodeArray()) {
205 debug_bytecode_array = debug_info->DebugBytecodeArray();
206 sfi->SetDebugBytecodeArray(debug_info->OriginalBytecodeArray());
207 }
208 sfi->set_script_or_debug_info(debug_info->script());
209 }
210 DCHECK(!sfi->HasDebugInfo());
211
212 // Mark SFI to indicate whether the code is cached.
213 bool was_deserialized = sfi->deserialized();
214 sfi->set_deserialized(sfi->is_compiled());
215 SerializeGeneric(obj, how_to_code, where_to_point);
216 sfi->set_deserialized(was_deserialized);
217
218 // Restore debug info
219 if (debug_info != nullptr) {
220 sfi->set_script_or_debug_info(debug_info);
221 if (debug_bytecode_array != nullptr) {
222 sfi->SetDebugBytecodeArray(debug_bytecode_array);
223 }
224 }
225 return;
226 }
227
228 if (obj->IsBytecodeArray()) {
229 // Clear the stack frame cache if present
230 BytecodeArray::cast(obj)->ClearFrameCacheFromSourcePositionTable();
231 }
232
233 // Past this point we should not see any (context-specific) maps anymore.
234 CHECK(!obj->IsMap());
235 // There should be no references to the global object embedded.
236 CHECK(!obj->IsJSGlobalProxy() && !obj->IsJSGlobalObject());
237 // Embedded FixedArrays that need rehashing must support rehashing.
238 CHECK_IMPLIES(obj->NeedsRehashing(), obj->CanBeRehashed());
239 // We expect no instantiated function objects or contexts.
240 CHECK(!obj->IsJSFunction() && !obj->IsContext());
241
242 SerializeGeneric(obj, how_to_code, where_to_point);
243 }
244
SerializeGeneric(HeapObject * heap_object,HowToCode how_to_code,WhereToPoint where_to_point)245 void CodeSerializer::SerializeGeneric(HeapObject* heap_object,
246 HowToCode how_to_code,
247 WhereToPoint where_to_point) {
248 // Object has not yet been serialized. Serialize it here.
249 ObjectSerializer serializer(this, heap_object, &sink_, how_to_code,
250 where_to_point);
251 serializer.Serialize();
252 }
253
SerializeCodeStub(Code * code_stub,HowToCode how_to_code,WhereToPoint where_to_point)254 void CodeSerializer::SerializeCodeStub(Code* code_stub, HowToCode how_to_code,
255 WhereToPoint where_to_point) {
256 // We only arrive here if we have not encountered this code stub before.
257 DCHECK(!reference_map()->LookupReference(code_stub).is_valid());
258 uint32_t stub_key = code_stub->stub_key();
259 DCHECK(CodeStub::MajorKeyFromKey(stub_key) != CodeStub::NoCache);
260 DCHECK(!CodeStub::GetCode(isolate(), stub_key).is_null());
261 stub_keys_.push_back(stub_key);
262
263 SerializerReference reference =
264 reference_map()->AddAttachedReference(code_stub);
265 if (FLAG_trace_serializer) {
266 PrintF(" Encoding code stub %s as attached reference %d\n",
267 CodeStub::MajorName(CodeStub::MajorKeyFromKey(stub_key)),
268 reference.attached_reference_index());
269 }
270 PutAttachedReference(reference, how_to_code, where_to_point);
271 }
272
Deserialize(Isolate * isolate,ScriptData * cached_data,Handle<String> source,ScriptOriginOptions origin_options)273 MaybeHandle<SharedFunctionInfo> CodeSerializer::Deserialize(
274 Isolate* isolate, ScriptData* cached_data, Handle<String> source,
275 ScriptOriginOptions origin_options) {
276 base::ElapsedTimer timer;
277 if (FLAG_profile_deserialization || FLAG_log_function_events) timer.Start();
278
279 HandleScope scope(isolate);
280
281 SerializedCodeData::SanityCheckResult sanity_check_result =
282 SerializedCodeData::CHECK_SUCCESS;
283 const SerializedCodeData scd = SerializedCodeData::FromCachedData(
284 isolate, cached_data,
285 SerializedCodeData::SourceHash(source, origin_options),
286 &sanity_check_result);
287 if (sanity_check_result != SerializedCodeData::CHECK_SUCCESS) {
288 if (FLAG_profile_deserialization) PrintF("[Cached code failed check]\n");
289 DCHECK(cached_data->rejected());
290 isolate->counters()->code_cache_reject_reason()->AddSample(
291 sanity_check_result);
292 return MaybeHandle<SharedFunctionInfo>();
293 }
294
295 // Deserialize.
296 MaybeHandle<SharedFunctionInfo> maybe_result =
297 ObjectDeserializer::DeserializeSharedFunctionInfo(isolate, &scd, source);
298
299 Handle<SharedFunctionInfo> result;
300 if (!maybe_result.ToHandle(&result)) {
301 // Deserializing may fail if the reservations cannot be fulfilled.
302 if (FLAG_profile_deserialization) PrintF("[Deserializing failed]\n");
303 return MaybeHandle<SharedFunctionInfo>();
304 }
305
306 if (FLAG_profile_deserialization) {
307 double ms = timer.Elapsed().InMillisecondsF();
308 int length = cached_data->length();
309 PrintF("[Deserializing from %d bytes took %0.3f ms]\n", length, ms);
310 }
311
312 bool log_code_creation = isolate->logger()->is_listening_to_code_events() ||
313 isolate->is_profiling();
314 if (log_code_creation || FLAG_log_function_events) {
315 String* name = ReadOnlyRoots(isolate).empty_string();
316 if (result->script()->IsScript()) {
317 Script* script = Script::cast(result->script());
318 if (script->name()->IsString()) name = String::cast(script->name());
319 if (FLAG_log_function_events) {
320 LOG(isolate, FunctionEvent("deserialize", script->id(),
321 timer.Elapsed().InMillisecondsF(),
322 result->StartPosition(),
323 result->EndPosition(), name));
324 }
325 }
326 if (log_code_creation) {
327 PROFILE(isolate, CodeCreateEvent(CodeEventListener::SCRIPT_TAG,
328 result->abstract_code(), *result, name));
329 }
330 }
331
332 if (isolate->NeedsSourcePositionsForProfiling()) {
333 Handle<Script> script(Script::cast(result->script()), isolate);
334 Script::InitLineEnds(script);
335 }
336 return scope.CloseAndEscape(result);
337 }
338
339 class Checksum {
340 public:
Checksum(Vector<const byte> payload)341 explicit Checksum(Vector<const byte> payload) {
342 #ifdef MEMORY_SANITIZER
343 // Computing the checksum includes padding bytes for objects like strings.
344 // Mark every object as initialized in the code serializer.
345 MSAN_MEMORY_IS_INITIALIZED(payload.start(), payload.length());
346 #endif // MEMORY_SANITIZER
347 // Fletcher's checksum. Modified to reduce 64-bit sums to 32-bit.
348 uintptr_t a = 1;
349 uintptr_t b = 0;
350 const uintptr_t* cur = reinterpret_cast<const uintptr_t*>(payload.start());
351 DCHECK(IsAligned(payload.length(), kIntptrSize));
352 const uintptr_t* end = cur + payload.length() / kIntptrSize;
353 while (cur < end) {
354 // Unsigned overflow expected and intended.
355 a += *cur++;
356 b += a;
357 }
358 #if V8_HOST_ARCH_64_BIT
359 a ^= a >> 32;
360 b ^= b >> 32;
361 #endif // V8_HOST_ARCH_64_BIT
362 a_ = static_cast<uint32_t>(a);
363 b_ = static_cast<uint32_t>(b);
364 }
365
Check(uint32_t a,uint32_t b) const366 bool Check(uint32_t a, uint32_t b) const { return a == a_ && b == b_; }
367
a() const368 uint32_t a() const { return a_; }
b() const369 uint32_t b() const { return b_; }
370
371 private:
372 uint32_t a_;
373 uint32_t b_;
374
375 DISALLOW_COPY_AND_ASSIGN(Checksum);
376 };
377
SerializedCodeData(const std::vector<byte> * payload,const CodeSerializer * cs)378 SerializedCodeData::SerializedCodeData(const std::vector<byte>* payload,
379 const CodeSerializer* cs) {
380 DisallowHeapAllocation no_gc;
381 const std::vector<uint32_t>* stub_keys = cs->stub_keys();
382 std::vector<Reservation> reservations = cs->EncodeReservations();
383
384 // Calculate sizes.
385 uint32_t reservation_size =
386 static_cast<uint32_t>(reservations.size()) * kUInt32Size;
387 uint32_t num_stub_keys = static_cast<uint32_t>(stub_keys->size());
388 uint32_t stub_keys_size = num_stub_keys * kUInt32Size;
389 uint32_t payload_offset = kHeaderSize + reservation_size + stub_keys_size;
390 uint32_t padded_payload_offset = POINTER_SIZE_ALIGN(payload_offset);
391 uint32_t size =
392 padded_payload_offset + static_cast<uint32_t>(payload->size());
393
394 // Allocate backing store and create result data.
395 AllocateData(size);
396
397 // Set header values.
398 SetMagicNumber(cs->isolate());
399 SetHeaderValue(kVersionHashOffset, Version::Hash());
400 SetHeaderValue(kSourceHashOffset, cs->source_hash());
401 SetHeaderValue(kCpuFeaturesOffset,
402 static_cast<uint32_t>(CpuFeatures::SupportedFeatures()));
403 SetHeaderValue(kFlagHashOffset, FlagList::Hash());
404 SetHeaderValue(kNumReservationsOffset,
405 static_cast<uint32_t>(reservations.size()));
406 SetHeaderValue(kNumCodeStubKeysOffset, num_stub_keys);
407 SetHeaderValue(kPayloadLengthOffset, static_cast<uint32_t>(payload->size()));
408
409 // Zero out any padding in the header.
410 memset(data_ + kUnalignedHeaderSize, 0, kHeaderSize - kUnalignedHeaderSize);
411
412 // Copy reservation chunk sizes.
413 CopyBytes(data_ + kHeaderSize,
414 reinterpret_cast<const byte*>(reservations.data()),
415 reservation_size);
416
417 // Copy code stub keys.
418 CopyBytes(data_ + kHeaderSize + reservation_size,
419 reinterpret_cast<const byte*>(stub_keys->data()), stub_keys_size);
420
421 // Zero out any padding before the payload.
422 memset(data_ + payload_offset, 0, padded_payload_offset - payload_offset);
423
424 // Copy serialized data.
425 CopyBytes(data_ + padded_payload_offset, payload->data(),
426 static_cast<size_t>(payload->size()));
427
428 Checksum checksum(DataWithoutHeader());
429 SetHeaderValue(kChecksum1Offset, checksum.a());
430 SetHeaderValue(kChecksum2Offset, checksum.b());
431 }
432
SanityCheck(Isolate * isolate,uint32_t expected_source_hash) const433 SerializedCodeData::SanityCheckResult SerializedCodeData::SanityCheck(
434 Isolate* isolate, uint32_t expected_source_hash) const {
435 if (this->size_ < kHeaderSize) return INVALID_HEADER;
436 uint32_t magic_number = GetMagicNumber();
437 if (magic_number != ComputeMagicNumber(isolate)) return MAGIC_NUMBER_MISMATCH;
438 uint32_t version_hash = GetHeaderValue(kVersionHashOffset);
439 uint32_t source_hash = GetHeaderValue(kSourceHashOffset);
440 uint32_t cpu_features = GetHeaderValue(kCpuFeaturesOffset);
441 uint32_t flags_hash = GetHeaderValue(kFlagHashOffset);
442 uint32_t payload_length = GetHeaderValue(kPayloadLengthOffset);
443 uint32_t c1 = GetHeaderValue(kChecksum1Offset);
444 uint32_t c2 = GetHeaderValue(kChecksum2Offset);
445 if (version_hash != Version::Hash()) return VERSION_MISMATCH;
446 if (source_hash != expected_source_hash) return SOURCE_MISMATCH;
447 if (cpu_features != static_cast<uint32_t>(CpuFeatures::SupportedFeatures())) {
448 return CPU_FEATURES_MISMATCH;
449 }
450 if (flags_hash != FlagList::Hash()) return FLAGS_MISMATCH;
451 uint32_t max_payload_length =
452 this->size_ -
453 POINTER_SIZE_ALIGN(kHeaderSize +
454 GetHeaderValue(kNumReservationsOffset) * kInt32Size +
455 GetHeaderValue(kNumCodeStubKeysOffset) * kInt32Size);
456 if (payload_length > max_payload_length) return LENGTH_MISMATCH;
457 if (!Checksum(DataWithoutHeader()).Check(c1, c2)) return CHECKSUM_MISMATCH;
458 return CHECK_SUCCESS;
459 }
460
SourceHash(Handle<String> source,ScriptOriginOptions origin_options)461 uint32_t SerializedCodeData::SourceHash(Handle<String> source,
462 ScriptOriginOptions origin_options) {
463 const uint32_t source_length = source->length();
464
465 static constexpr uint32_t kModuleFlagMask = (1 << 31);
466 const uint32_t is_module = origin_options.IsModule() ? kModuleFlagMask : 0;
467 DCHECK_EQ(0, source_length & kModuleFlagMask);
468
469 return source_length | is_module;
470 }
471
472 // Return ScriptData object and relinquish ownership over it to the caller.
GetScriptData()473 ScriptData* SerializedCodeData::GetScriptData() {
474 DCHECK(owns_data_);
475 ScriptData* result = new ScriptData(data_, size_);
476 result->AcquireDataOwnership();
477 owns_data_ = false;
478 data_ = nullptr;
479 return result;
480 }
481
Reservations() const482 std::vector<SerializedData::Reservation> SerializedCodeData::Reservations()
483 const {
484 uint32_t size = GetHeaderValue(kNumReservationsOffset);
485 std::vector<Reservation> reservations(size);
486 memcpy(reservations.data(), data_ + kHeaderSize,
487 size * sizeof(SerializedData::Reservation));
488 return reservations;
489 }
490
Payload() const491 Vector<const byte> SerializedCodeData::Payload() const {
492 int reservations_size = GetHeaderValue(kNumReservationsOffset) * kInt32Size;
493 int code_stubs_size = GetHeaderValue(kNumCodeStubKeysOffset) * kInt32Size;
494 int payload_offset = kHeaderSize + reservations_size + code_stubs_size;
495 int padded_payload_offset = POINTER_SIZE_ALIGN(payload_offset);
496 const byte* payload = data_ + padded_payload_offset;
497 DCHECK(IsAligned(reinterpret_cast<intptr_t>(payload), kPointerAlignment));
498 int length = GetHeaderValue(kPayloadLengthOffset);
499 DCHECK_EQ(data_ + size_, payload + length);
500 return Vector<const byte>(payload, length);
501 }
502
CodeStubKeys() const503 Vector<const uint32_t> SerializedCodeData::CodeStubKeys() const {
504 int reservations_size = GetHeaderValue(kNumReservationsOffset) * kInt32Size;
505 const byte* start = data_ + kHeaderSize + reservations_size;
506 return Vector<const uint32_t>(reinterpret_cast<const uint32_t*>(start),
507 GetHeaderValue(kNumCodeStubKeysOffset));
508 }
509
SerializedCodeData(ScriptData * data)510 SerializedCodeData::SerializedCodeData(ScriptData* data)
511 : SerializedData(const_cast<byte*>(data->data()), data->length()) {}
512
FromCachedData(Isolate * isolate,ScriptData * cached_data,uint32_t expected_source_hash,SanityCheckResult * rejection_result)513 SerializedCodeData SerializedCodeData::FromCachedData(
514 Isolate* isolate, ScriptData* cached_data, uint32_t expected_source_hash,
515 SanityCheckResult* rejection_result) {
516 DisallowHeapAllocation no_gc;
517 SerializedCodeData scd(cached_data);
518 *rejection_result = scd.SanityCheck(isolate, expected_source_hash);
519 if (*rejection_result != CHECK_SUCCESS) {
520 cached_data->Reject();
521 return SerializedCodeData(nullptr, 0);
522 }
523 return scd;
524 }
525
526 } // namespace internal
527 } // namespace v8
528