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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
*/
#ifndef DOM_Arena_h___
#define DOM_Arena_h___
#include "nsISupportsImpl.h"
#include "mozmemory.h"
#include "mozilla/mozalloc_oom.h" // for mozalloc_handle_oom
#define NS_DECL_DOMARENA_DESTROY void Destroy(void);
#define NS_IMPL_DOMARENA_DESTROY(class) \
void class ::Destroy(void) { \
if (StaticPrefs::dom_arena_allocator_enabled_AtStartup()) { \
RefPtr<nsNodeInfoManager> nim = OwnerDoc()->NodeInfoManager(); \
RefPtr<DOMArena> arena = \
HasFlag(NODE_KEEPS_DOMARENA) \
? nsContentUtils::TakeEntryFromDOMArenaTable(this) \
: nullptr; \
this->~class(); \
MOZ_ASSERT(nim, "nsNodeInfoManager needs to be initialized"); \
nim->Free(this); \
} else { \
delete this; \
} \
}
namespace mozilla::dom {
class DOMArena {
public:
friend class DocGroup;
DOMArena() {
arena_params_t params;
params.mMaxDirtyIncreaseOverride = 7;
params.mFlags = ARENA_FLAG_THREAD_MAIN_THREAD_ONLY;
mArenaId = moz_create_arena_with_params(¶ms);
}
NS_INLINE_DECL_REFCOUNTING(DOMArena)
void* Allocate(size_t aSize) {
void* ret = moz_arena_malloc(mArenaId, aSize);
if (!ret) {
mozalloc_handle_oom(aSize);
}
return ret;
}
private:
~DOMArena() { moz_dispose_arena(mArenaId); }
arena_id_t mArenaId;
};
} // namespace mozilla::dom
#endif