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[heap] Remove IsolateSafepointScope in CombinedHeapObjectIterator

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The safepoint is already initiated by the HeapObjectIterator. In
addition the CombinedHeapObjectIterator wasn't updated for the shared
heap and always used an IsolateSafepointScope which didn't match the
global safepoint initiated by HeapObjectIterator.
Simplify this by relying on the safepoint scope in HeapObjectIterator.

This CL also moves the verification that all client isolates are
fully deserialized into the GC.

Bug: v8:13267
Change-Id: I59eff66a38fd8ecd8e90f68e6ed5abc5d2d4cec9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4076332
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#84631}
This commit is contained in:
Dominik Inführ 2022-12-03 20:58:55 +01:00 committed by V8 LUCI CQ
parent bb288ea342
commit c62d8261dc
4 changed files with 2 additions and 4 deletions
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3
src/heap/combined-heap.cc
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@ -10,8 +10,7 @@ namespace internal {
CombinedHeapObjectIterator::CombinedHeapObjectIterator(
Heap* heap, HeapObjectIterator::HeapObjectsFiltering filtering)
: safepoint_scope_(heap),
heap_iterator_(heap, filtering),
: heap_iterator_(heap, filtering),
ro_heap_iterator_(heap->isolate()->read_only_heap()) {}
HeapObject CombinedHeapObjectIterator::Next() {

1
src/heap/combined-heap.h
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@ -26,7 +26,6 @@ class V8_EXPORT_PRIVATE CombinedHeapObjectIterator final {
HeapObject Next();
private:
IsolateSafepointScope safepoint_scope_;
HeapObjectIterator heap_iterator_;
ReadOnlyHeapObjectIterator ro_heap_iterator_;
};

1
src/heap/heap.cc
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@ -2212,6 +2212,7 @@ size_t Heap::PerformGarbageCollection(GarbageCollector collector,
if (isolate()->is_shared_heap_isolate()) {
isolate()->global_safepoint()->IterateClientIsolates([](Isolate* client) {
if (client->is_shared_heap_isolate()) return;
CHECK(client->heap()->deserialization_complete());
if (v8_flags.concurrent_marking) {
client->heap()->concurrent_marking()->Pause();

1
src/heap/safepoint.cc
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@ -393,7 +393,6 @@ void GlobalSafepoint::EnterGlobalSafepointScope(Isolate* initiator) {
#if DEBUG
for (const PerClientSafepointData& client : clients) {
DCHECK_EQ(client.isolate()->shared_heap_isolate(), shared_heap_isolate_);
DCHECK(client.heap()->deserialization_complete());
}
#endif // DEBUG