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// Copyright 2022 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_INTERNAL_CAGED_HEAP_H_
#define INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
#include <climits>
#include <cstddef>
#include "cppgc/internal/api-constants.h"
#include "cppgc/internal/base-page-handle.h"
#include "v8config.h" // NOLINT(build/include_directory)
#if defined(CPPGC_CAGED_HEAP)
namespace cppgc {
namespace internal {
class V8_EXPORT CagedHeapBase {
public:
V8_INLINE static uintptr_t OffsetFromAddress(const void* address) {
return reinterpret_cast<uintptr_t>(address) &
(api_constants::kCagedHeapReservationAlignment - 1);
}
V8_INLINE static bool IsWithinCage(const void* address) {
CPPGC_DCHECK(g_heap_base_);
return (reinterpret_cast<uintptr_t>(address) &
~(api_constants::kCagedHeapReservationAlignment - 1)) ==
g_heap_base_;
}
V8_INLINE static bool AreWithinCage(const void* addr1, const void* addr2) {
#if defined(CPPGC_2GB_CAGE)
static constexpr size_t kHalfWordShift = sizeof(uint32_t) * CHAR_BIT - 1;
#else //! defined(CPPGC_2GB_CAGE)
static constexpr size_t kHalfWordShift = sizeof(uint32_t) * CHAR_BIT;
#endif //! defined(CPPGC_2GB_CAGE)
static_assert((static_cast<size_t>(1) << kHalfWordShift) ==
api_constants::kCagedHeapReservationSize);
CPPGC_DCHECK(g_heap_base_);
return !(((reinterpret_cast<uintptr_t>(addr1) ^ g_heap_base_) |
(reinterpret_cast<uintptr_t>(addr2) ^ g_heap_base_)) >>
kHalfWordShift);
}
V8_INLINE static uintptr_t GetBase() { return g_heap_base_; }
private:
friend class CagedHeap;
static uintptr_t g_heap_base_;
};
} // namespace internal
} // namespace cppgc
#endif // defined(CPPGC_CAGED_HEAP)
#endif // INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
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