v8: backport pieces from 18a26cfe174 from upstream v8

Backport new virtual methods from 18a26cfe174 ("Add memory protection API to ArrayBuffer::Allocator") PR-URL: #13217 Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: James M Snell <[email protected]>

Author: psmarshall

deps/v8/include/v8.h

@@ -4176,12 +4176,20 @@ class V8_EXPORT ArrayBuffer : public Object{
  */
  virtual void* AllocateUninitialized(size_t length) = 0;
 
+ virtual void* Reserve(size_t length);
+
  /**
  * Free the memory block of size |length|, pointed to by |data|.
  * That memory is guaranteed to be previously allocated by |Allocate|.
  */
  virtual void Free(void* data, size_t length) = 0;
 
+ enum class AllocationMode{kNormal, kReservation };
+ virtual void Free(void* data, size_t length, AllocationMode mode);
+ enum class Protection{kNoAccess, kReadWrite };
+ virtual void SetProtection(void* data, size_t length,
+ Protection protection);
+
  /**
  * malloc/free based convenience allocator.
  *

deps/v8/src/api.cc

@@ -437,6 +437,18 @@ void V8::SetSnapshotDataBlob(StartupData* snapshot_blob){
 i::V8::SetSnapshotBlob(snapshot_blob);
 }
 
+void* v8::ArrayBuffer::Allocator::Reserve(size_t length){UNIMPLEMENTED()}
+
+voidv8::ArrayBuffer::Allocator::Free(void* data, size_t length,
+ AllocationMode mode){
+UNIMPLEMENTED();
+}
+
+voidv8::ArrayBuffer::Allocator::SetProtection(
+void* data, size_t length,
+ v8::ArrayBuffer::Allocator::Protection protection){
+UNIMPLEMENTED();
+}
 
 namespace{