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Unified Diff: src/heap/spaces.h

Issue 2026463002: Reland "[heap] Fine-grained JSArrayBuffer tracking" (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: make ArrayBufferTracker AllStatic Created 4 years, 7 months ago
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Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 59d8cfb6d9ed6d9d7c06d8e9d58689cb2950437e..f9b473d0de854520950cff14ef6fc49571d30adc 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -14,6 +14,7 @@
#include "src/base/platform/mutex.h"
#include "src/flags.h"
#include "src/hashmap.h"
+#include "src/heap/array-buffer-tracker.h"
#include "src/list.h"
#include "src/objects.h"
#include "src/utils.h"
@@ -468,6 +469,8 @@ class MemoryChunk {
kSweepingInProgress,
};
+ enum ArrayBufferTrackerAccessMode { kDontCreate, kCreateIfNotPresent };
+
// Every n write barrier invocations we go to runtime even though
// we could have handled it in generated code. This lets us check
// whether we have hit the limit and should do some more marking.
@@ -523,7 +526,8 @@ class MemoryChunk {
+ kPointerSize // AtomicValue next_chunk_
+ kPointerSize // AtomicValue prev_chunk_
// FreeListCategory categories_[kNumberOfCategories]
- + FreeListCategory::kSize * kNumberOfCategories;
+ + FreeListCategory::kSize * kNumberOfCategories +
+ kPointerSize; // LocalArrayBufferTracker tracker_
// We add some more space to the computed header size to amount for missing
// alignment requirements in our computation.
@@ -642,6 +646,21 @@ class MemoryChunk {
void AllocateTypedOldToOldSlots();
void ReleaseTypedOldToOldSlots();
+ template <ArrayBufferTrackerAccessMode tracker_access>
+ inline LocalArrayBufferTracker* local_tracker() {
+ LocalArrayBufferTracker* tracker = local_tracker_.Value();
+ if (tracker == nullptr && tracker_access == kCreateIfNotPresent) {
+ tracker = new LocalArrayBufferTracker(heap_);
+ if (!local_tracker_.TrySetValue(nullptr, tracker)) {
+ tracker = local_tracker_.Value();
+ }
+ DCHECK_NOT_NULL(tracker);
+ }
+ return tracker;
+ }
+
+ void ReleaseLocalTracker();
+
Address area_start() { return area_start_; }
Address area_end() { return area_end_; }
int area_size() { return static_cast<int>(area_end() - area_start()); }
@@ -824,6 +843,8 @@ class MemoryChunk {
FreeListCategory categories_[kNumberOfCategories];
+ base::AtomicValue<LocalArrayBufferTracker*> local_tracker_;
+
private:
void InitializeReservedMemory() { reservation_.Reset(); }
@@ -2300,6 +2321,16 @@ class PagedSpace : public Space {
inline void UnlinkFreeListCategories(Page* page);
inline intptr_t RelinkFreeListCategories(Page* page);
+ // Callback signature:
+ // void Callback(Page*);
+ template <typename Callback>
+ void ForAllPages(Callback callback) {
+ PageIterator it(this);
+ while (it.has_next()) {
+ callback(it.next());
+ }
+ }
+
protected:
// PagedSpaces that should be included in snapshots have different, i.e.,
// smaller, initial pages.
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