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918fe04351
PR-URL: https://github.com/nodejs/node/pull/58070 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
64 lines
2 KiB
C++
64 lines
2 KiB
C++
// Copyright 2022 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
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#define INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
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#include <climits>
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#include <cstddef>
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#include "cppgc/internal/api-constants.h"
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#include "cppgc/internal/base-page-handle.h"
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#include "v8config.h" // NOLINT(build/include_directory)
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#if defined(CPPGC_CAGED_HEAP)
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namespace cppgc {
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namespace internal {
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class V8_EXPORT CagedHeapBase {
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public:
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V8_INLINE static uintptr_t OffsetFromAddress(const void* address) {
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return reinterpret_cast<uintptr_t>(address) &
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(api_constants::kCagedHeapReservationAlignment - 1);
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}
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V8_INLINE static bool IsWithinCage(const void* address) {
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CPPGC_DCHECK(g_heap_base_);
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return (reinterpret_cast<uintptr_t>(address) &
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~(api_constants::kCagedHeapReservationAlignment - 1)) ==
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g_heap_base_;
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}
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V8_INLINE static bool AreWithinCage(const void* addr1, const void* addr2) {
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#if defined(CPPGC_POINTER_COMPRESSION)
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static constexpr size_t kHeapBaseShift =
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31 + api_constants::kPointerCompressionShift;
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#else // !defined(CPPGC_POINTER_COMPRESSION)
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static constexpr size_t kHeapBaseShift = sizeof(uint32_t) * CHAR_BIT;
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#endif // !defined(CPPGC_POINTER_COMPRESSION)
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static_assert((static_cast<size_t>(1) << kHeapBaseShift) ==
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api_constants::kCagedHeapMaxReservationSize);
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CPPGC_DCHECK(g_heap_base_);
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return !(((reinterpret_cast<uintptr_t>(addr1) ^ g_heap_base_) |
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(reinterpret_cast<uintptr_t>(addr2) ^ g_heap_base_)) >>
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kHeapBaseShift);
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}
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V8_INLINE static uintptr_t GetBase() { return g_heap_base_; }
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V8_INLINE static size_t GetAgeTableSize() { return g_age_table_size_; }
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private:
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friend class CagedHeap;
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static uintptr_t g_heap_base_;
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static size_t g_age_table_size_;
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};
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} // namespace internal
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} // namespace cppgc
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#endif // defined(CPPGC_CAGED_HEAP)
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#endif // INCLUDE_CPPGC_INTERNAL_CAGED_HEAP_H_
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