deps: patch V8 to 9.5.172.24

Refs: v8/v8@9.5.172.21...9.5.172.24

deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 9
 #define V8_MINOR_VERSION 5
 #define V8_BUILD_NUMBER 172
-#define V8_PATCH_LEVEL 21
+#define V8_PATCH_LEVEL 24
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/compiler/backend/ia32/code-generator-ia32.cc

@@ -343,8 +343,8 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
       __ CallRecordWriteStubSaveRegisters(object_, scratch1_,
                                           remembered_set_action, save_fp_mode,
                                           StubCallMode::kCallWasmRuntimeStub);
-    } else {
 #endif  // V8_ENABLE_WEBASSEMBLY
+    } else {
       __ CallRecordWriteStubSaveRegisters(object_, scratch1_,
                                           remembered_set_action, save_fp_mode);
     }

deps/v8/src/heap/cppgc/marker.cc

@@ -243,6 +243,7 @@ void MarkerBase::EnterAtomicPause(MarkingConfig::StackState stack_state) {
   }
   config_.stack_state = stack_state;
   config_.marking_type = MarkingConfig::MarkingType::kAtomic;
+  mutator_marking_state_.set_in_atomic_pause();
 
   // Lock guards against changes to {Weak}CrossThreadPersistent handles, that
   // may conflict with marking. E.g., a WeakCrossThreadPersistent may be

deps/v8/src/heap/cppgc/marking-state.h

@@ -9,6 +9,7 @@
 
 #include "include/cppgc/trace-trait.h"
 #include "include/cppgc/visitor.h"
+#include "src/base/logging.h"
 #include "src/heap/cppgc/compaction-worklists.h"
 #include "src/heap/cppgc/globals.h"
 #include "src/heap/cppgc/heap-object-header.h"
@@ -123,6 +124,8 @@ class MarkingStateBase {
     discovered_new_ephemeron_pairs_ = false;
   }
 
+  void set_in_atomic_pause() { in_atomic_pause_ = true; }
+
  protected:
   inline void MarkAndPush(HeapObjectHeader&, TraceDescriptor);
 
@@ -160,6 +163,7 @@ class MarkingStateBase {
   size_t marked_bytes_ = 0;
   bool in_ephemeron_processing_ = false;
   bool discovered_new_ephemeron_pairs_ = false;
+  bool in_atomic_pause_ = false;
 };
 
 MarkingStateBase::MarkingStateBase(HeapBase& heap,
@@ -300,12 +304,19 @@ void MarkingStateBase::ProcessEphemeron(const void* key, const void* value,
   // would break the main marking loop.
   DCHECK(!in_ephemeron_processing_);
   in_ephemeron_processing_ = true;
-  // Filter out already marked keys. The write barrier for WeakMember
-  // ensures that any newly set value after this point is kept alive and does
-  // not require the callback.
-  if (!HeapObjectHeader::FromObject(key)
-           .IsInConstruction<AccessMode::kAtomic>() &&
-      HeapObjectHeader::FromObject(key).IsMarked<AccessMode::kAtomic>()) {
+  // Keys are considered live even in incremental/concurrent marking settings
+  // because the write barrier for WeakMember ensures that any newly set value
+  // after this point is kept alive and does not require the callback.
+  const bool key_in_construction =
+      HeapObjectHeader::FromObject(key).IsInConstruction<AccessMode::kAtomic>();
+  const bool key_considered_as_live =
+      key_in_construction
+          ? in_atomic_pause_
+          : HeapObjectHeader::FromObject(key).IsMarked<AccessMode::kAtomic>();
+  DCHECK_IMPLIES(
+      key_in_construction && in_atomic_pause_,
+      HeapObjectHeader::FromObject(key).IsMarked<AccessMode::kAtomic>());
+  if (key_considered_as_live) {
     if (value_desc.base_object_payload) {
       MarkAndPush(value_desc.base_object_payload, value_desc);
     } else {

deps/v8/src/ic/accessor-assembler.cc

@@ -846,8 +846,8 @@ void AccessorAssembler::HandleLoadICSmiHandlerLoadNamedCase(
     Comment("module export");
     TNode<UintPtrT> index =
         DecodeWord<LoadHandler::ExportsIndexBits>(handler_word);
-    TNode<Module> module = LoadObjectField<Module>(
-        CAST(p->receiver()), JSModuleNamespace::kModuleOffset);
+    TNode<Module> module =
+        LoadObjectField<Module>(CAST(holder), JSModuleNamespace::kModuleOffset);
     TNode<ObjectHashTable> exports =
         LoadObjectField<ObjectHashTable>(module, Module::kExportsOffset);
     TNode<Cell> cell = CAST(LoadFixedArrayElement(exports, index));

deps/v8/src/ic/ic.cc

@@ -989,7 +989,13 @@ Handle<Object> LoadIC::ComputeHandler(LookupIterator* lookup) {
         // We found the accessor, so the entry must exist.
         DCHECK(entry.is_found());
         int index = ObjectHashTable::EntryToValueIndex(entry);
-        return LoadHandler::LoadModuleExport(isolate(), index);
+        Handle<Smi> smi_handler =
+            LoadHandler::LoadModuleExport(isolate(), index);
+        if (holder_is_lookup_start_object) {
+          return smi_handler;
+        }
+        return LoadHandler::LoadFromPrototype(isolate(), map, holder,
+                                              smi_handler);
       }
 
       Handle<Object> accessors = lookup->GetAccessors();

deps/v8/test/unittests/heap/cppgc/ephemeron-pair-unittest.cc

@@ -242,5 +242,50 @@ TEST_F(EphemeronPairTest, EphemeronPairWithEmptyMixinValue) {
   FinishMarking();
 }
 
+namespace {
+
+class KeyWithCallback final : public GarbageCollected<KeyWithCallback> {
+ public:
+  template <typename Callback>
+  explicit KeyWithCallback(Callback callback) {
+    callback(this);
+  }
+  void Trace(Visitor*) const {}
+};
+
+class EphemeronHolderForKeyWithCallback final
+    : public GarbageCollected<EphemeronHolderForKeyWithCallback> {
+ public:
+  EphemeronHolderForKeyWithCallback(KeyWithCallback* key, GCed* value)
+      : ephemeron_pair_(key, value) {}
+  void Trace(cppgc::Visitor* visitor) const { visitor->Trace(ephemeron_pair_); }
+
+ private:
+  const EphemeronPair<KeyWithCallback, GCed> ephemeron_pair_;
+};
+
+}  // namespace
+
+TEST_F(EphemeronPairTest, EphemeronPairWithKeyInConstruction) {
+  GCed* value = MakeGarbageCollected<GCed>(GetAllocationHandle());
+  Persistent<EphemeronHolderForKeyWithCallback> holder;
+  InitializeMarker(*Heap::From(GetHeap()), GetPlatformHandle().get());
+  FinishSteps();
+  MakeGarbageCollected<KeyWithCallback>(
+      GetAllocationHandle(), [this, &holder, value](KeyWithCallback* thiz) {
+        // The test doesn't use conservative stack scanning to retain key to
+        // avoid retaining value as a side effect.
+        EXPECT_TRUE(HeapObjectHeader::FromObject(thiz).TryMarkAtomic());
+        holder = MakeGarbageCollected<EphemeronHolderForKeyWithCallback>(
+            GetAllocationHandle(), thiz, value);
+        // Finishing marking at this point will leave an ephemeron pair
+        // reachable where the key is still in construction. The GC needs to
+        // mark the value for such pairs as live in the atomic pause as they key
+        // is considered live.
+        FinishMarking();
+      });
+  EXPECT_TRUE(HeapObjectHeader::FromObject(value).IsMarked());
+}
+
 }  // namespace internal
 }  // namespace cppgc