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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ServoBindingTypes_h
#define mozilla_ServoBindingTypes_h
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
struct ServoComputedValues;
struct RawServoStyleSheet;
struct RawServoStyleSet;
struct RawServoDeclarationBlock;
namespace mozilla {
namespace dom {
class Element;
class StyleChildrenIterator;
} // namespace dom
} // namespace mozilla
class nsCSSValue;
class nsIDocument;
class nsINode;
using mozilla::dom::StyleChildrenIterator;
typedef nsINode RawGeckoNode;
typedef mozilla::dom::Element RawGeckoElement;
typedef nsIDocument RawGeckoDocument;
// We have these helper types so that we can directly generate
// things like &T or Borrowed<T> on the Rust side in the function, providing
// additional safety benefits.
//
// FFI has a problem with templated types, so we just use raw pointers here.
//
// The "Borrowed" types generate &T or Borrowed<T> in the nullable case.
//
// The "Owned" types generate Owned<T> or OwnedOrNull<T>. Some of these
// are Servo-managed and can be converted to Box<ServoType> on the
// Servo side.
//
// The "Arc" types are Servo-managed Arc<ServoType>s, which are passed
// over FFI as Strong<T> (which is nullable).
// Note that T != ServoType, rather T is ArcInner<ServoType>
#define DECL_BORROWED_REF_TYPE_FOR(type_) typedef type_ const* type_##Borrowed;
#define DECL_NULLABLE_BORROWED_REF_TYPE_FOR(type_) typedef type_ const* type_##BorrowedOrNull;
#define DECL_BORROWED_MUT_REF_TYPE_FOR(type_) typedef type_* type_##BorrowedMut;
#define DECL_NULLABLE_BORROWED_MUT_REF_TYPE_FOR(type_) typedef type_* type_##BorrowedMutOrNull;
#define DECL_ARC_REF_TYPE_FOR(type_) \
DECL_NULLABLE_BORROWED_REF_TYPE_FOR(type_) \
DECL_BORROWED_REF_TYPE_FOR(type_) \
struct MOZ_MUST_USE_TYPE type_##Strong \
{ \
type_* mPtr; \
already_AddRefed<type_> Consume(); \
};
#define DECL_OWNED_REF_TYPE_FOR(type_) \
typedef type_* type_##Owned; \
DECL_BORROWED_REF_TYPE_FOR(type_) \
DECL_BORROWED_MUT_REF_TYPE_FOR(type_)
#define DECL_NULLABLE_OWNED_REF_TYPE_FOR(type_) \
typedef type_* type_##OwnedOrNull; \
DECL_NULLABLE_BORROWED_REF_TYPE_FOR(type_) \
DECL_NULLABLE_BORROWED_MUT_REF_TYPE_FOR(type_)
DECL_ARC_REF_TYPE_FOR(ServoComputedValues)
DECL_ARC_REF_TYPE_FOR(RawServoStyleSheet)
DECL_ARC_REF_TYPE_FOR(RawServoDeclarationBlock)
// This is a reference to a reference of RawServoDeclarationBlock, which
// corresponds to Option<&Arc<RawServoDeclarationBlock>> in Servo side.
DECL_NULLABLE_BORROWED_REF_TYPE_FOR(RawServoDeclarationBlockStrong)
DECL_OWNED_REF_TYPE_FOR(RawServoStyleSet)
DECL_NULLABLE_OWNED_REF_TYPE_FOR(StyleChildrenIterator)
DECL_OWNED_REF_TYPE_FOR(StyleChildrenIterator)
// We don't use BorrowedMut because the nodes may alias
// Servo itself doesn't directly read or mutate these;
// it only asks Gecko to do so. In case we wish to in
// the future, we should ensure that things being mutated
// are protected from noalias violations by a cell type
DECL_BORROWED_REF_TYPE_FOR(RawGeckoNode)
DECL_NULLABLE_BORROWED_REF_TYPE_FOR(RawGeckoNode)
DECL_BORROWED_REF_TYPE_FOR(RawGeckoElement)
DECL_NULLABLE_BORROWED_REF_TYPE_FOR(RawGeckoElement)
DECL_BORROWED_REF_TYPE_FOR(RawGeckoDocument)
DECL_NULLABLE_BORROWED_REF_TYPE_FOR(RawGeckoDocument)
DECL_BORROWED_MUT_REF_TYPE_FOR(StyleChildrenIterator)
DECL_BORROWED_REF_TYPE_FOR(nsCSSValue)
DECL_BORROWED_MUT_REF_TYPE_FOR(nsCSSValue)
#undef DECL_ARC_REF_TYPE_FOR
#undef DECL_OWNED_REF_TYPE_FOR
#undef DECL_NULLABLE_OWNED_REF_TYPE_FOR
#undef DECL_BORROWED_REF_TYPE_FOR
#undef DECL_NULLABLE_BORROWED_REF_TYPE_FOR
#undef DECL_BORROWED_MUT_REF_TYPE_FOR
#undef DECL_NULLABLE_BORROWED_MUT_REF_TYPE_FOR
#define DEFINE_REFPTR_TRAITS(name_, type_) \
extern "C" { \
void Servo_##name_##_AddRef(type_##Borrowed ptr); \
void Servo_##name_##_Release(type_##Borrowed ptr); \
} \
namespace mozilla { \
template<> struct RefPtrTraits<type_> { \
static void AddRef(type_* aPtr) { \
Servo_##name_##_AddRef(aPtr); \
} \
static void Release(type_* aPtr) { \
Servo_##name_##_Release(aPtr); \
} \
}; \
}
DEFINE_REFPTR_TRAITS(StyleSheet, RawServoStyleSheet)
DEFINE_REFPTR_TRAITS(ComputedValues, ServoComputedValues)
DEFINE_REFPTR_TRAITS(DeclarationBlock, RawServoDeclarationBlock)
#undef DEFINE_REFPTR_TRAITS
extern "C" void Servo_StyleSet_Drop(RawServoStyleSetOwned ptr);
namespace mozilla {
template<>
class DefaultDelete<RawServoStyleSet>
{
public:
void operator()(RawServoStyleSet* aPtr) const
{
Servo_StyleSet_Drop(aPtr);
}
};
}
#endif // mozilla_ServoBindingTypes_h
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