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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef INCLUDE_CPPGC_EXPLICIT_MANAGEMENT_H_
#define INCLUDE_CPPGC_EXPLICIT_MANAGEMENT_H_
#include <cstddef>
#include "cppgc/allocation.h"
#include "cppgc/internal/logging.h"
#include "cppgc/type-traits.h"
namespace cppgc {
class HeapHandle;
namespace subtle {
template <typename T>
void FreeUnreferencedObject(HeapHandle& heap_handle, T& object);
template <typename T>
bool Resize(T& object, AdditionalBytes additional_bytes);
} // namespace subtle
namespace internal {
class ExplicitManagementImpl final {
private:
V8_EXPORT static void FreeUnreferencedObject(HeapHandle&, void*);
V8_EXPORT static bool Resize(void*, size_t);
template <typename T>
friend void subtle::FreeUnreferencedObject(HeapHandle&, T&);
template <typename T>
friend bool subtle::Resize(T&, AdditionalBytes);
};
} // namespace internal
namespace subtle {
/**
* Informs the garbage collector that `object` can be immediately reclaimed. The
* destructor may not be invoked immediately but only on next garbage
* collection.
*
* It is up to the embedder to guarantee that no other object holds a reference
* to `object` after calling `FreeUnreferencedObject()`. In case such a
* reference exists, it's use results in a use-after-free.
*
* To aid in using the API, `FreeUnreferencedObject()` may be called from
* destructors on objects that would be reclaimed in the same garbage collection
* cycle.
*
* \param heap_handle The corresponding heap.
* \param object Reference to an object that is of type `GarbageCollected` and
* should be immediately reclaimed.
*/
template <typename T>
void FreeUnreferencedObject(HeapHandle& heap_handle, T& object) {
static_assert(IsGarbageCollectedTypeV<T>,
"Object must be of type GarbageCollected.");
internal::ExplicitManagementImpl::FreeUnreferencedObject(heap_handle,
&object);
}
/**
* Tries to resize `object` of type `T` with additional bytes on top of
* sizeof(T). Resizing is only useful with trailing inlined storage, see e.g.
* `MakeGarbageCollected(AllocationHandle&, AdditionalBytes)`.
*
* `Resize()` performs growing or shrinking as needed and may skip the operation
* for internal reasons, see return value.
*
* It is up to the embedder to guarantee that in case of shrinking a larger
* object down, the reclaimed area is not used anymore. Any subsequent use
* results in a use-after-free.
*
* The `object` must be live when calling `Resize()`.
*
* \param object Reference to an object that is of type `GarbageCollected` and
* should be resized.
* \param additional_bytes Bytes in addition to sizeof(T) that the object should
* provide.
* \returns true when the operation was successful and the result can be relied
* on, and false otherwise.
*/
template <typename T>
bool Resize(T& object, AdditionalBytes additional_bytes) {
static_assert(IsGarbageCollectedTypeV<T>,
"Object must be of type GarbageCollected.");
return internal::ExplicitManagementImpl::Resize(
&object, sizeof(T) + additional_bytes.value);
}
} // namespace subtle
} // namespace cppgc
#endif // INCLUDE_CPPGC_EXPLICIT_MANAGEMENT_H_
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| internal | Folder | 0755 |
|
|
| allocation.h | File | 11.61 KB | 0644 |
|
| common.h | File | 643 B | 0644 |
|
| cross-thread-persistent.h | File | 14.81 KB | 0644 |
|
| custom-space.h | File | 2.4 KB | 0644 |
|
| default-platform.h | File | 2.18 KB | 0644 |
|
| ephemeron-pair.h | File | 804 B | 0644 |
|
| explicit-management.h | File | 3.29 KB | 0644 |
|
| garbage-collected.h | File | 3.11 KB | 0644 |
|
| heap-consistency.h | File | 11.74 KB | 0644 |
|
| heap-handle.h | File | 1.26 KB | 0644 |
|
| heap-state.h | File | 2.57 KB | 0644 |
|
| heap-statistics.h | File | 3.89 KB | 0644 |
|
| heap.h | File | 5.7 KB | 0644 |
|
| liveness-broker.h | File | 2.34 KB | 0644 |
|
| macros.h | File | 1.31 KB | 0644 |
|
| member.h | File | 23.55 KB | 0644 |
|
| name-provider.h | File | 1.99 KB | 0644 |
|
| object-size-trait.h | File | 1.6 KB | 0644 |
|
| persistent.h | File | 13.61 KB | 0644 |
|
| platform.h | File | 5.9 KB | 0644 |
|
| prefinalizer.h | File | 2.88 KB | 0644 |
|
| process-heap-statistics.h | File | 1009 B | 0644 |
|
| sentinel-pointer.h | File | 1.18 KB | 0644 |
|
| source-location.h | File | 414 B | 0644 |
|
| testing.h | File | 2.96 KB | 0644 |
|
| trace-trait.h | File | 3.4 KB | 0644 |
|
| type-traits.h | File | 8.45 KB | 0644 |
|
| visitor.h | File | 18.08 KB | 0644 |
|