[heap] Allow TPH to access some heap private interfaces.

This CL make TPH be able to access some heap private interfaces, by
marking TPH classes as friend classes.

Bug: v8:11641
Change-Id: I72aebf267c8f36593f50279bec5dccb44cda9528
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2994220
Auto-Submit: Wenyu Zhao <wenyu.zhao@anu.edu.au>
Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Wenyu Zhao <wenyu.zhao@anu.edu.au>
Cr-Commit-Position: refs/heads/master@{#75572}

src/heap/heap.h

@@ -53,6 +53,7 @@ class TestMemoryAllocatorScope;
 
 namespace third_party_heap {
 class Heap;
+class Impl;
 }  // namespace third_party_heap
 
 class IncrementalMarking;
@@ -2499,6 +2500,8 @@ class Heap {
   friend class Space;
   friend class Sweeper;
   friend class heap::TestMemoryAllocatorScope;
+  friend class third_party_heap::Heap;
+  friend class third_party_heap::Impl;
 
   // The allocator interface.
   friend class Factory;

src/heap/third-party/heap-api-stub.cc

@@ -20,6 +20,8 @@ namespace v8 {
 namespace internal {
 namespace third_party_heap {
 
+class Impl {};
+
 // static
 std::unique_ptr<Heap> Heap::New(v8::internal::Isolate*) { return nullptr; }
 

src/heap/third-party/heap-api.h

@@ -13,6 +13,8 @@ namespace v8 {
 namespace internal {
 namespace third_party_heap {
 
+class Impl;
+
 class Heap {
  public:
   static std::unique_ptr<Heap> New(v8::internal::Isolate* isolate);
@@ -48,6 +50,11 @@ class Heap {
   bool CollectGarbage();
 
   size_t Capacity();
+
+  V8_INLINE Impl* impl() { return impl_; }
+
+ private:
+  Impl* impl_ = nullptr;
 };
 
 }  // namespace third_party_heap

src/objects/hash-table.h

@@ -20,6 +20,10 @@
 namespace v8 {
 namespace internal {
 
+namespace third_party_heap {
+class Impl;
+}
+
 // HashTable is a subclass of FixedArray that implements a hash table
 // that uses open addressing and quadratic probing.
 //
@@ -399,6 +403,7 @@ class V8_EXPORT_PRIVATE EphemeronHashTable
  protected:
   friend class MarkCompactCollector;
   friend class ScavengerCollector;
+  friend class third_party_heap::Impl;
   friend class HashTable<EphemeronHashTable, ObjectHashTableShape>;
   friend class ObjectHashTableBase<EphemeronHashTable, ObjectHashTableShape>;
   inline void set_key(int index, Object value);

src/objects/transitions.h

@@ -19,6 +19,10 @@
 namespace v8 {
 namespace internal {
 
+namespace third_party_heap {
+class Impl;
+}
+
 // Find all transitions with given name and calls the callback.
 using ForEachTransitionCallback = std::function<void(Map)>;
 
@@ -165,6 +169,7 @@ class V8_EXPORT_PRIVATE TransitionsAccessor {
 
  private:
   friend class MarkCompactCollector;  // For HasSimpleTransitionTo.
+  friend class third_party_heap::Impl;
   friend class TransitionArray;
 
   inline PropertyDetails GetSimpleTargetDetails(Map transition);
@@ -285,6 +290,7 @@ class TransitionArray : public WeakFixedArray {
  private:
   friend class Factory;
   friend class MarkCompactCollector;
+  friend class third_party_heap::Impl;
   friend class TransitionsAccessor;
 
   inline void SetNumberOfTransitions(int number_of_transitions);