src: delegate NodeArrayBufferAllocator to v8's allocator

PR-URL: #43594
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Shelley Vohr <shelley.vohr@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: nornagon

src/api/environment.cc

@@ -85,32 +85,32 @@ MaybeLocal<Value> PrepareStackTraceCallback(Local<Context> context,
 void* NodeArrayBufferAllocator::Allocate(size_t size) {
   void* ret;
   if (zero_fill_field_ || per_process::cli_options->zero_fill_all_buffers)
-    ret = UncheckedCalloc(size);
+    ret = allocator_->Allocate(size);
   else
-    ret = UncheckedMalloc(size);
+    ret = allocator_->AllocateUninitialized(size);
   if (LIKELY(ret != nullptr))
     total_mem_usage_.fetch_add(size, std::memory_order_relaxed);
   return ret;
 }
 
 void* NodeArrayBufferAllocator::AllocateUninitialized(size_t size) {
-  void* ret = node::UncheckedMalloc(size);
+  void* ret = allocator_->AllocateUninitialized(size);
   if (LIKELY(ret != nullptr))
     total_mem_usage_.fetch_add(size, std::memory_order_relaxed);
   return ret;
 }
 
 void* NodeArrayBufferAllocator::Reallocate(
     void* data, size_t old_size, size_t size) {
-  void* ret = UncheckedRealloc<char>(static_cast<char*>(data), size);
+  void* ret = allocator_->Reallocate(data, old_size, size);
   if (LIKELY(ret != nullptr) || UNLIKELY(size == 0))
     total_mem_usage_.fetch_add(size - old_size, std::memory_order_relaxed);
   return ret;
 }
 
 void NodeArrayBufferAllocator::Free(void* data, size_t size) {
   total_mem_usage_.fetch_sub(size, std::memory_order_relaxed);
-  free(data);
+  allocator_->Free(data, size);
 }
 
 DebuggingArrayBufferAllocator::~DebuggingArrayBufferAllocator() {

src/node_internals.h

@@ -118,6 +118,10 @@ class NodeArrayBufferAllocator : public ArrayBufferAllocator {
  private:
   uint32_t zero_fill_field_ = 1;  // Boolean but exposed as uint32 to JS land.
   std::atomic<size_t> total_mem_usage_ {0};
+
+  // Delegate to V8's allocator for compatibility with the V8 memory cage.
+  std::unique_ptr<v8::ArrayBuffer::Allocator> allocator_{
+      v8::ArrayBuffer::Allocator::NewDefaultAllocator()};
 };
 
 class DebuggingArrayBufferAllocator final : public NodeArrayBufferAllocator {